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Message-Id: <20240426150904.8854-34-Dave.Martin@arm.com>
Date: Fri, 26 Apr 2024 16:09:03 +0100
From: Dave Martin <Dave.Martin@....com>
To: x86@...nel.org,
linux-kernel@...r.kernel.org
Cc: James Morse <james.morse@....com>,
Fenghua Yu <fenghua.yu@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
H Peter Anvin <hpa@...or.com>,
Babu Moger <Babu.Moger@....com>,
shameerali.kolothum.thodi@...wei.com,
D Scott Phillips OS <scott@...amperecomputing.com>,
carl@...amperecomputing.com,
lcherian@...vell.com,
bobo.shaobowang@...wei.com,
"Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>,
baolin.wang@...ux.alibaba.com,
Jamie Iles <quic_jiles@...cinc.com>,
Xin Hao <xhao@...ux.alibaba.com>,
Peter Newman <peternewman@...gle.com>,
dfustini@...libre.com,
amitsinght@...vell.com,
David Hildenbrand <david@...hat.com>,
Rex Nie <rex.nie@...uarmicro.com>
Subject: [PATCH v2 34/35] x86/resctrl: Move the resctrl filesystem code to /fs/resctrl
From: James Morse <james.morse@....com>
resctrl is linux's defacto interface for managing cache and bandwidth
policies for groups of tasks.
To allow other architectures to make use of this pseudo filesystem,
move it to live in /fs/resctrl instead of /arch/x86.
This move leaves behind the parts of resctrl that form the architecture
interface for x86.
Signed-off-by: James Morse <james.morse@....com>
Signed-off-by: Dave Martin <Dave.Martin@....com>
---
FYI: James Morse (et al.):
* This patch has been manually rebased on top of other changes to the
series and needs to be rebuilt.
* Break this patch up into smaller patches, if this can be done
without adding excessive temporary glue to the constituent patches.
Changes in v2:
* [Commit message only]: Typo fix:
s/more it live/move it to live/
---
arch/x86/kernel/cpu/resctrl/core.c | 15 -
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 505 ---
arch/x86/kernel/cpu/resctrl/internal.h | 310 --
arch/x86/kernel/cpu/resctrl/monitor.c | 821 ----
arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 1093 ------
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 4288 +--------------------
fs/resctrl/ctrlmondata.c | 527 +++
fs/resctrl/internal.h | 340 ++
fs/resctrl/monitor.c | 843 ++++
fs/resctrl/pseudo_lock.c | 1122 ++++++
fs/resctrl/rdtgroup.c | 4013 +++++++++++++++++++
11 files changed, 6992 insertions(+), 6885 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index c0fb2e22e110..8ddfebd5f008 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -164,21 +164,6 @@ static inline void cache_alloc_hsw_probe(void)
rdt_alloc_capable = true;
}
-bool is_mba_sc(struct rdt_resource *r)
-{
- if (!r)
- r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
- /*
- * The software controller support is only applicable to MBA resource.
- * Make sure to check for resource type.
- */
- if (r->rid != RDT_RESOURCE_MBA)
- return false;
-
- return r->membw.mba_sc;
-}
-
/*
* rdt_get_mb_table() - get a mapping of bandwidth(b/w) percentage values
* exposed to user interface and the h/w understandable delay values.
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index b4627ae19291..c5c3eaea27b6 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -23,260 +23,6 @@
#include "internal.h"
-struct rdt_parse_data {
- struct rdtgroup *rdtgrp;
- char *buf;
-};
-
-typedef int (ctrlval_parser_t)(struct rdt_parse_data *data,
- struct resctrl_schema *s,
- struct rdt_domain *d);
-
-/*
- * Check whether MBA bandwidth percentage value is correct. The value is
- * checked against the minimum and max bandwidth values specified by the
- * hardware. The allocated bandwidth percentage is rounded to the next
- * control step available on the hardware.
- */
-static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
-{
- unsigned long bw;
- int ret;
-
- /*
- * Only linear delay values is supported for current Intel SKUs.
- */
- if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
- rdt_last_cmd_puts("No support for non-linear MB domains\n");
- return false;
- }
-
- ret = kstrtoul(buf, 10, &bw);
- if (ret) {
- rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
- return false;
- }
-
- if ((bw < r->membw.min_bw || bw > r->default_ctrl) &&
- !is_mba_sc(r)) {
- rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
- r->membw.min_bw, r->default_ctrl);
- return false;
- }
-
- *data = roundup(bw, (unsigned long)r->membw.bw_gran);
- return true;
-}
-
-static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
- struct rdt_domain *d)
-{
- struct resctrl_staged_config *cfg;
- u32 closid = data->rdtgrp->closid;
- struct rdt_resource *r = s->res;
- unsigned long bw_val;
-
- cfg = &d->staged_config[s->conf_type];
- if (cfg->have_new_ctrl) {
- rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
- return -EINVAL;
- }
-
- if (!bw_validate(data->buf, &bw_val, r))
- return -EINVAL;
-
- if (is_mba_sc(r)) {
- d->mbps_val[closid] = bw_val;
- return 0;
- }
-
- cfg->new_ctrl = bw_val;
- cfg->have_new_ctrl = true;
-
- return 0;
-}
-
-/*
- * Check whether a cache bit mask is valid.
- * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
- * - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
- * - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
- *
- * Haswell does not support a non-contiguous 1s value and additionally
- * requires at least two bits set.
- * AMD allows non-contiguous bitmasks.
- */
-static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
-{
- unsigned long first_bit, zero_bit, val;
- unsigned int cbm_len = r->cache.cbm_len;
- int ret;
-
- ret = kstrtoul(buf, 16, &val);
- if (ret) {
- rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
- return false;
- }
-
- if ((r->cache.min_cbm_bits > 0 && val == 0) || val > r->default_ctrl) {
- rdt_last_cmd_puts("Mask out of range\n");
- return false;
- }
-
- first_bit = find_first_bit(&val, cbm_len);
- zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
-
- /* Are non-contiguous bitmasks allowed? */
- if (!r->cache.arch_has_sparse_bitmasks &&
- (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
- rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
- return false;
- }
-
- if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
- rdt_last_cmd_printf("Need at least %d bits in the mask\n",
- r->cache.min_cbm_bits);
- return false;
- }
-
- *data = val;
- return true;
-}
-
-/*
- * Read one cache bit mask (hex). Check that it is valid for the current
- * resource type.
- */
-static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
- struct rdt_domain *d)
-{
- struct rdtgroup *rdtgrp = data->rdtgrp;
- struct resctrl_staged_config *cfg;
- struct rdt_resource *r = s->res;
- u32 cbm_val;
-
- cfg = &d->staged_config[s->conf_type];
- if (cfg->have_new_ctrl) {
- rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
- return -EINVAL;
- }
-
- /*
- * Cannot set up more than one pseudo-locked region in a cache
- * hierarchy.
- */
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
- rdtgroup_pseudo_locked_in_hierarchy(d)) {
- rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
- return -EINVAL;
- }
-
- if (!cbm_validate(data->buf, &cbm_val, r))
- return -EINVAL;
-
- if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
- rdtgrp->mode == RDT_MODE_SHAREABLE) &&
- rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
- rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
- return -EINVAL;
- }
-
- /*
- * The CBM may not overlap with the CBM of another closid if
- * either is exclusive.
- */
- if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
- rdt_last_cmd_puts("Overlaps with exclusive group\n");
- return -EINVAL;
- }
-
- if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
- if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
- rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- rdt_last_cmd_puts("Overlaps with other group\n");
- return -EINVAL;
- }
- }
-
- cfg->new_ctrl = cbm_val;
- cfg->have_new_ctrl = true;
-
- return 0;
-}
-
-static ctrlval_parser_t *get_parser(struct rdt_resource *res)
-{
- if (res->fflags & RFTYPE_RES_CACHE)
- return &parse_cbm;
- else
- return &parse_bw;
-}
-
-/*
- * For each domain in this resource we expect to find a series of:
- * id=mask
- * separated by ";". The "id" is in decimal, and must match one of
- * the "id"s for this resource.
- */
-static int parse_line(char *line, struct resctrl_schema *s,
- struct rdtgroup *rdtgrp)
-{
- ctrlval_parser_t *parse_ctrlval = get_parser(s->res);
- enum resctrl_conf_type t = s->conf_type;
- struct resctrl_staged_config *cfg;
- struct rdt_resource *r = s->res;
- struct rdt_parse_data data;
- char *dom = NULL, *id;
- struct rdt_domain *d;
- unsigned long dom_id;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
- (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
- rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
- return -EINVAL;
- }
-
-next:
- if (!line || line[0] == '\0')
- return 0;
- dom = strsep(&line, ";");
- id = strsep(&dom, "=");
- if (!dom || kstrtoul(id, 10, &dom_id)) {
- rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
- return -EINVAL;
- }
- dom = strim(dom);
- list_for_each_entry(d, &r->domains, list) {
- if (d->id == dom_id) {
- data.buf = dom;
- data.rdtgrp = rdtgrp;
- if (parse_ctrlval(&data, s, d))
- return -EINVAL;
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- cfg = &d->staged_config[t];
- /*
- * In pseudo-locking setup mode and just
- * parsed a valid CBM that should be
- * pseudo-locked. Only one locked region per
- * resource group and domain so just do
- * the required initialization for single
- * region and return.
- */
- rdtgrp->plr->s = s;
- rdtgrp->plr->d = d;
- rdtgrp->plr->cbm = cfg->new_ctrl;
- d->plr = rdtgrp->plr;
- return 0;
- }
- goto next;
- }
- }
- return -EINVAL;
-}
-
static bool apply_config(struct rdt_hw_domain *hw_dom,
struct resctrl_staged_config *cfg, u32 idx,
cpumask_var_t cpu_mask)
@@ -365,100 +111,6 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
return 0;
}
-static int rdtgroup_parse_resource(char *resname, char *tok,
- struct rdtgroup *rdtgrp)
-{
- struct resctrl_schema *s;
-
- list_for_each_entry(s, &resctrl_schema_all, list) {
- if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
- return parse_line(tok, s, rdtgrp);
- }
- rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
- return -EINVAL;
-}
-
-ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off)
-{
- struct resctrl_schema *s;
- struct rdtgroup *rdtgrp;
- struct rdt_resource *r;
- char *tok, *resname;
- int ret = 0;
-
- /* Valid input requires a trailing newline */
- if (nbytes == 0 || buf[nbytes - 1] != '\n')
- return -EINVAL;
- buf[nbytes - 1] = '\0';
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- rdtgroup_kn_unlock(of->kn);
- return -ENOENT;
- }
- rdt_last_cmd_clear();
-
- /*
- * No changes to pseudo-locked region allowed. It has to be removed
- * and re-created instead.
- */
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
- ret = -EINVAL;
- rdt_last_cmd_puts("Resource group is pseudo-locked\n");
- goto out;
- }
-
- rdt_staged_configs_clear();
-
- while ((tok = strsep(&buf, "\n")) != NULL) {
- resname = strim(strsep(&tok, ":"));
- if (!tok) {
- rdt_last_cmd_puts("Missing ':'\n");
- ret = -EINVAL;
- goto out;
- }
- if (tok[0] == '\0') {
- rdt_last_cmd_printf("Missing '%s' value\n", resname);
- ret = -EINVAL;
- goto out;
- }
- ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
- if (ret)
- goto out;
- }
-
- list_for_each_entry(s, &resctrl_schema_all, list) {
- r = s->res;
-
- /*
- * Writes to mba_sc resources update the software controller,
- * not the control MSR.
- */
- if (is_mba_sc(r))
- continue;
-
- ret = resctrl_arch_update_domains(r, rdtgrp->closid);
- if (ret)
- goto out;
- }
-
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- /*
- * If pseudo-locking fails we keep the resource group in
- * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
- * active and updated for just the domain the pseudo-locked
- * region was requested for.
- */
- ret = rdtgroup_pseudo_lock_create(rdtgrp);
- }
-
-out:
- rdt_staged_configs_clear();
- rdtgroup_kn_unlock(of->kn);
- return ret ?: nbytes;
-}
-
u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
u32 closid, enum resctrl_conf_type type)
{
@@ -467,160 +119,3 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
return hw_dom->ctrl_val[idx];
}
-
-static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
-{
- struct rdt_resource *r = schema->res;
- struct rdt_domain *dom;
- bool sep = false;
- u32 ctrl_val;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- seq_printf(s, "%*s:", max_name_width, schema->name);
- list_for_each_entry(dom, &r->domains, list) {
- if (sep)
- seq_puts(s, ";");
-
- if (is_mba_sc(r))
- ctrl_val = dom->mbps_val[closid];
- else
- ctrl_val = resctrl_arch_get_config(r, dom, closid,
- schema->conf_type);
-
- seq_printf(s, r->format_str, dom->id, max_data_width,
- ctrl_val);
- sep = true;
- }
- seq_puts(s, "\n");
-}
-
-int rdtgroup_schemata_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
-{
- struct resctrl_schema *schema;
- struct rdtgroup *rdtgrp;
- int ret = 0;
- u32 closid;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (rdtgrp) {
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- list_for_each_entry(schema, &resctrl_schema_all, list) {
- seq_printf(s, "%s:uninitialized\n", schema->name);
- }
- } else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
- if (!rdtgrp->plr->d) {
- rdt_last_cmd_clear();
- rdt_last_cmd_puts("Cache domain offline\n");
- ret = -ENODEV;
- } else {
- seq_printf(s, "%s:%d=%x\n",
- rdtgrp->plr->s->res->name,
- rdtgrp->plr->d->id,
- rdtgrp->plr->cbm);
- }
- } else {
- closid = rdtgrp->closid;
- list_for_each_entry(schema, &resctrl_schema_all, list) {
- if (closid < schema->num_closid)
- show_doms(s, schema, closid);
- }
- }
- } else {
- ret = -ENOENT;
- }
- rdtgroup_kn_unlock(of->kn);
- return ret;
-}
-
-static int smp_mon_event_count(void *arg)
-{
- mon_event_count(arg);
-
- return 0;
-}
-
-void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
- struct rdt_domain *d, struct rdtgroup *rdtgrp,
- int evtid, int first)
-{
- int cpu;
-
- /* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- /*
- * Setup the parameters to pass to mon_event_count() to read the data.
- */
- rr->rgrp = rdtgrp;
- rr->evtid = evtid;
- rr->r = r;
- rr->d = d;
- rr->val = 0;
- rr->first = first;
- rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
- if (IS_ERR(rr->arch_mon_ctx)) {
- rr->err = -EINVAL;
- return;
- }
-
- cpu = cpumask_any_housekeeping(&d->cpu_mask, RESCTRL_PICK_ANY_CPU);
-
- /*
- * cpumask_any_housekeeping() prefers housekeeping CPUs, but
- * are all the CPUs nohz_full? If yes, pick a CPU to IPI.
- * MPAM's resctrl_arch_rmid_read() is unable to read the
- * counters on some platforms if its called in IRQ context.
- */
- if (tick_nohz_full_cpu(cpu))
- smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
- else
- smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
-
- resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
-}
-
-int rdtgroup_mondata_show(struct seq_file *m, void *arg)
-{
- struct kernfs_open_file *of = m->private;
- u32 resid, evtid, domid;
- struct rdtgroup *rdtgrp;
- struct rdt_resource *r;
- union mon_data_bits md;
- struct rdt_domain *d;
- struct rmid_read rr;
- int ret = 0;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- ret = -ENOENT;
- goto out;
- }
-
- md.priv = of->kn->priv;
- resid = md.u.rid;
- domid = md.u.domid;
- evtid = md.u.evtid;
-
- r = resctrl_arch_get_resource(resid);
- d = resctrl_arch_find_domain(r, domid);
- if (IS_ERR_OR_NULL(d)) {
- ret = -ENOENT;
- goto out;
- }
-
- mon_event_read(&rr, r, d, rdtgrp, evtid, false);
-
- if (rr.err == -EIO)
- seq_puts(m, "Error\n");
- else if (rr.err == -EINVAL)
- seq_puts(m, "Unavailable\n");
- else
- seq_printf(m, "%llu\n", rr.val);
-
-out:
- rdtgroup_kn_unlock(of->kn);
- return ret;
-}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index e4244e771ef6..8c20bd04b840 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -25,227 +25,6 @@
*/
#define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
-/**
- * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
- * aren't marked nohz_full
- * @mask: The mask to pick a CPU from.
- * @exclude_cpu:The CPU to avoid picking.
- *
- * Returns a CPU from @mask, but not @exclude_cpu. If there are housekeeping
- * CPUs that don't use nohz_full, these are preferred. Pass
- * RESCTRL_PICK_ANY_CPU to avoid excluding any CPUs.
- *
- * When a CPU is excluded, returns >= nr_cpu_ids if no CPUs are available.
- */
-static inline unsigned int
-cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
-{
- unsigned int cpu, hk_cpu;
-
- if (exclude_cpu == RESCTRL_PICK_ANY_CPU)
- cpu = cpumask_any(mask);
- else
- cpu = cpumask_any_but(mask, exclude_cpu);
-
- if (!IS_ENABLED(CONFIG_NO_HZ_FULL))
- return cpu;
-
- /* If the CPU picked isn't marked nohz_full nothing more needs doing. */
- if (cpu < nr_cpu_ids && !tick_nohz_full_cpu(cpu))
- return cpu;
-
- /* Try to find a CPU that isn't nohz_full to use in preference */
- hk_cpu = cpumask_nth_andnot(0, mask, tick_nohz_full_mask);
- if (hk_cpu == exclude_cpu)
- hk_cpu = cpumask_nth_andnot(1, mask, tick_nohz_full_mask);
-
- if (hk_cpu < nr_cpu_ids)
- cpu = hk_cpu;
-
- return cpu;
-}
-
-struct rdt_fs_context {
- struct kernfs_fs_context kfc;
- bool enable_cdpl2;
- bool enable_cdpl3;
- bool enable_mba_mbps;
- bool enable_debug;
-};
-
-static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
-{
- struct kernfs_fs_context *kfc = fc->fs_private;
-
- return container_of(kfc, struct rdt_fs_context, kfc);
-}
-
-/**
- * struct mon_evt - Entry in the event list of a resource
- * @evtid: event id
- * @name: name of the event
- * @configurable: true if the event is configurable
- * @list: entry in &rdt_resource->evt_list
- */
-struct mon_evt {
- enum resctrl_event_id evtid;
- char *name;
- bool configurable;
- struct list_head list;
-};
-
-/**
- * union mon_data_bits - Monitoring details for each event file
- * @priv: Used to store monitoring event data in @u
- * as kernfs private data
- * @rid: Resource id associated with the event file
- * @evtid: Event id associated with the event file
- * @domid: The domain to which the event file belongs
- * @u: Name of the bit fields struct
- */
-union mon_data_bits {
- void *priv;
- struct {
- unsigned int rid : 10;
- enum resctrl_event_id evtid : 8;
- unsigned int domid : 14;
- } u;
-};
-
-struct rmid_read {
- struct rdtgroup *rgrp;
- struct rdt_resource *r;
- struct rdt_domain *d;
- enum resctrl_event_id evtid;
- bool first;
- int err;
- u64 val;
- void *arch_mon_ctx;
-};
-
-extern struct list_head resctrl_schema_all;
-extern bool resctrl_mounted;
-
-enum rdt_group_type {
- RDTCTRL_GROUP = 0,
- RDTMON_GROUP,
- RDT_NUM_GROUP,
-};
-
-/**
- * enum rdtgrp_mode - Mode of a RDT resource group
- * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
- * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
- * @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking
- * @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations
- * allowed AND the allocations are Cache Pseudo-Locked
- * @RDT_NUM_MODES: Total number of modes
- *
- * The mode of a resource group enables control over the allowed overlap
- * between allocations associated with different resource groups (classes
- * of service). User is able to modify the mode of a resource group by
- * writing to the "mode" resctrl file associated with the resource group.
- *
- * The "shareable", "exclusive", and "pseudo-locksetup" modes are set by
- * writing the appropriate text to the "mode" file. A resource group enters
- * "pseudo-locked" mode after the schemata is written while the resource
- * group is in "pseudo-locksetup" mode.
- */
-enum rdtgrp_mode {
- RDT_MODE_SHAREABLE = 0,
- RDT_MODE_EXCLUSIVE,
- RDT_MODE_PSEUDO_LOCKSETUP,
- RDT_MODE_PSEUDO_LOCKED,
-
- /* Must be last */
- RDT_NUM_MODES,
-};
-
-/**
- * struct mongroup - store mon group's data in resctrl fs.
- * @mon_data_kn: kernfs node for the mon_data directory
- * @parent: parent rdtgrp
- * @crdtgrp_list: child rdtgroup node list
- * @rmid: rmid for this rdtgroup
- */
-struct mongroup {
- struct kernfs_node *mon_data_kn;
- struct rdtgroup *parent;
- struct list_head crdtgrp_list;
- u32 rmid;
-};
-
-/**
- * struct rdtgroup - store rdtgroup's data in resctrl file system.
- * @kn: kernfs node
- * @rdtgroup_list: linked list for all rdtgroups
- * @closid: closid for this rdtgroup
- * @cpu_mask: CPUs assigned to this rdtgroup
- * @flags: status bits
- * @waitcount: how many cpus expect to find this
- * group when they acquire rdtgroup_mutex
- * @type: indicates type of this rdtgroup - either
- * monitor only or ctrl_mon group
- * @mon: mongroup related data
- * @mode: mode of resource group
- * @plr: pseudo-locked region
- */
-struct rdtgroup {
- struct kernfs_node *kn;
- struct list_head rdtgroup_list;
- u32 closid;
- struct cpumask cpu_mask;
- int flags;
- atomic_t waitcount;
- enum rdt_group_type type;
- struct mongroup mon;
- enum rdtgrp_mode mode;
- struct pseudo_lock_region *plr;
-};
-
-/* List of all resource groups */
-extern struct list_head rdt_all_groups;
-
-extern int max_name_width, max_data_width;
-
-/**
- * struct rftype - describe each file in the resctrl file system
- * @name: File name
- * @mode: Access mode
- * @kf_ops: File operations
- * @flags: File specific RFTYPE_FLAGS_* flags
- * @fflags: File specific RFTYPE_* flags
- * @seq_show: Show content of the file
- * @write: Write to the file
- */
-struct rftype {
- char *name;
- umode_t mode;
- const struct kernfs_ops *kf_ops;
- unsigned long flags;
- unsigned long fflags;
-
- int (*seq_show)(struct kernfs_open_file *of,
- struct seq_file *sf, void *v);
- /*
- * write() is the generic write callback which maps directly to
- * kernfs write operation and overrides all other operations.
- * Maximum write size is determined by ->max_write_len.
- */
- ssize_t (*write)(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off);
-};
-
-/**
- * struct mbm_state - status for each MBM counter in each domain
- * @prev_bw_bytes: Previous bytes value read for bandwidth calculation
- * @prev_bw: The most recent bandwidth in MBps
- */
-struct mbm_state {
- u64 prev_bw_bytes;
- u32 prev_bw;
-};
-
/**
* struct arch_mbm_state - values used to compute resctrl_arch_rmid_read()s
* return value.
@@ -326,11 +105,7 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
return container_of(r, struct rdt_hw_resource, r_resctrl);
}
-extern struct mutex rdtgroup_mutex;
-
extern struct rdt_hw_resource rdt_resources_all[];
-extern struct rdtgroup rdtgroup_default;
-extern struct dentry *debugfs_resctrl;
static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
{
@@ -394,95 +169,10 @@ union cpuid_0x10_x_edx {
unsigned int full;
};
-void rdt_last_cmd_clear(void);
-void rdt_last_cmd_puts(const char *s);
-__printf(1, 2)
-void rdt_last_cmd_printf(const char *fmt, ...);
-
void rdt_ctrl_update(void *arg);
-struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
-void rdtgroup_kn_unlock(struct kernfs_node *kn);
-int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
-int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
- umode_t mask);
-ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off);
-int rdtgroup_schemata_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v);
-bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
- unsigned long cbm, int closid, bool exclusive);
-unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
- unsigned long cbm);
-enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
-int rdtgroup_tasks_assigned(struct rdtgroup *r);
-int closids_supported(void);
-void closid_free(int closid);
-int alloc_rmid(u32 closid);
-void free_rmid(u32 closid, u32 rmid);
int rdt_get_mon_l3_config(struct rdt_resource *r);
-void resctrl_mon_resource_exit(void);
bool rdt_cpu_has(int flag);
-void mon_event_count(void *info);
-int rdtgroup_mondata_show(struct seq_file *m, void *arg);
-void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
- struct rdt_domain *d, struct rdtgroup *rdtgrp,
- int evtid, int first);
-int resctrl_mon_resource_init(void);
-void mbm_setup_overflow_handler(struct rdt_domain *dom,
- unsigned long delay_ms,
- int exclude_cpu);
-void mbm_handle_overflow(struct work_struct *work);
void __init intel_rdt_mbm_apply_quirk(void);
-bool is_mba_sc(struct rdt_resource *r);
-void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
- int exclude_cpu);
-void cqm_handle_limbo(struct work_struct *work);
-bool has_busy_rmid(struct rdt_domain *d);
-void __check_limbo(struct rdt_domain *d, bool force_free);
void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
-void mbm_config_rftype_init(const char *config);
-void rdt_staged_configs_clear(void);
-bool closid_allocated(unsigned int closid);
-int resctrl_find_cleanest_closid(void);
-
-#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
-int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
-int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
-int rdt_pseudo_lock_init(void);
-void rdt_pseudo_lock_release(void);
-int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
-void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
-#else
-static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
-{
- return -EOPNOTSUPP;
-}
-
-static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
-{
- return -EOPNOTSUPP;
-}
-
-static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
-{
- return false;
-}
-
-static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
-{
- return false;
-}
-
-static inline int rdt_pseudo_lock_init(void) { return 0; }
-static inline void rdt_pseudo_lock_release(void) { }
-static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
-{
- return -EOPNOTSUPP;
-}
-
-static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
-#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
#endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 88634a5bef75..02fb9d87479a 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -25,53 +25,6 @@
#include "internal.h"
-/**
- * struct rmid_entry - dirty tracking for all RMID.
- * @closid: The CLOSID for this entry.
- * @rmid: The RMID for this entry.
- * @busy: The number of domains with cached data using this RMID.
- * @list: Member of the rmid_free_lru list when busy == 0.
- *
- * Depending on the architecture the correct monitor is accessed using
- * both @closid and @rmid, or @rmid only.
- *
- * Take the rdtgroup_mutex when accessing.
- */
-struct rmid_entry {
- u32 closid;
- u32 rmid;
- int busy;
- struct list_head list;
-};
-
-/*
- * @rmid_free_lru - A least recently used list of free RMIDs
- * These RMIDs are guaranteed to have an occupancy less than the
- * threshold occupancy
- */
-static LIST_HEAD(rmid_free_lru);
-
-/*
- * @closid_num_dirty_rmid The number of dirty RMID each CLOSID has.
- * Only allocated when CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID is defined.
- * Indexed by CLOSID. Protected by rdtgroup_mutex.
- */
-static u32 *closid_num_dirty_rmid;
-
-/*
- * @rmid_limbo_count - count of currently unused but (potentially)
- * dirty RMIDs.
- * This counts RMIDs that no one is currently using but that
- * may have a occupancy value > resctrl_rmid_realloc_threshold. User can
- * change the threshold occupancy value.
- */
-static unsigned int rmid_limbo_count;
-
-/*
- * @rmid_entry - The entry in the limbo and free lists.
- */
-static struct rmid_entry *rmid_ptrs;
-
/*
* Global boolean for rdt_monitor which is true if any
* resource monitoring is enabled.
@@ -83,17 +36,6 @@ bool rdt_mon_capable;
*/
unsigned int rdt_mon_features;
-/*
- * This is the threshold cache occupancy in bytes at which we will consider an
- * RMID available for re-allocation.
- */
-unsigned int resctrl_rmid_realloc_threshold;
-
-/*
- * This is the maximum value for the reallocation threshold, in bytes.
- */
-unsigned int resctrl_rmid_realloc_limit;
-
#define CF(cf) ((unsigned long)(1048576 * (cf) + 0.5))
/*
@@ -157,33 +99,6 @@ static inline u64 get_corrected_mbm_count(u32 rmid, unsigned long val)
return val;
}
-/*
- * x86 and arm64 differ in their handling of monitoring.
- * x86's RMID are independent numbers, there is only one source of traffic
- * with an RMID value of '1'.
- * arm64's PMG extends the PARTID/CLOSID space, there are multiple sources of
- * traffic with a PMG value of '1', one for each CLOSID, meaning the RMID
- * value is no longer unique.
- * To account for this, resctrl uses an index. On x86 this is just the RMID,
- * on arm64 it encodes the CLOSID and RMID. This gives a unique number.
- *
- * The domain's rmid_busy_llc and rmid_ptrs[] are sized by index. The arch code
- * must accept an attempt to read every index.
- */
-static inline struct rmid_entry *__rmid_entry(u32 idx)
-{
- struct rmid_entry *entry;
- u32 closid, rmid;
-
- entry = &rmid_ptrs[idx];
- resctrl_arch_rmid_idx_decode(idx, &closid, &rmid);
-
- WARN_ON_ONCE(entry->closid != closid);
- WARN_ON_ONCE(entry->rmid != rmid);
-
- return entry;
-}
-
static int __rmid_read(u32 rmid, enum resctrl_event_id eventid, u64 *val)
{
u64 msr_val;
@@ -302,735 +217,6 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
return 0;
}
-static void limbo_release_entry(struct rmid_entry *entry)
-{
- lockdep_assert_held(&rdtgroup_mutex);
-
- rmid_limbo_count--;
- list_add_tail(&entry->list, &rmid_free_lru);
-
- if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
- closid_num_dirty_rmid[entry->closid]--;
-}
-
-/*
- * Check the RMIDs that are marked as busy for this domain. If the
- * reported LLC occupancy is below the threshold clear the busy bit and
- * decrement the count. If the busy count gets to zero on an RMID, we
- * free the RMID
- */
-void __check_limbo(struct rdt_domain *d, bool force_free)
-{
- struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
- u32 idx_limit = resctrl_arch_system_num_rmid_idx();
- struct rmid_entry *entry;
- u32 idx, cur_idx = 1;
- void *arch_mon_ctx;
- bool rmid_dirty;
- u64 val = 0;
-
- arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, QOS_L3_OCCUP_EVENT_ID);
- if (IS_ERR(arch_mon_ctx)) {
- pr_warn_ratelimited("Failed to allocate monitor context: %ld",
- PTR_ERR(arch_mon_ctx));
- return;
- }
-
- /*
- * Skip RMID 0 and start from RMID 1 and check all the RMIDs that
- * are marked as busy for occupancy < threshold. If the occupancy
- * is less than the threshold decrement the busy counter of the
- * RMID and move it to the free list when the counter reaches 0.
- */
- for (;;) {
- idx = find_next_bit(d->rmid_busy_llc, idx_limit, cur_idx);
- if (idx >= idx_limit)
- break;
-
- entry = __rmid_entry(idx);
- if (resctrl_arch_rmid_read(r, d, entry->closid, entry->rmid,
- QOS_L3_OCCUP_EVENT_ID, &val,
- arch_mon_ctx)) {
- rmid_dirty = true;
- } else {
- rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
- }
-
- if (force_free || !rmid_dirty) {
- clear_bit(idx, d->rmid_busy_llc);
- if (!--entry->busy)
- limbo_release_entry(entry);
- }
- cur_idx = idx + 1;
- }
-
- resctrl_arch_mon_ctx_free(r, QOS_L3_OCCUP_EVENT_ID, arch_mon_ctx);
-}
-
-bool has_busy_rmid(struct rdt_domain *d)
-{
- u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-
- return find_first_bit(d->rmid_busy_llc, idx_limit) != idx_limit;
-}
-
-static struct rmid_entry *resctrl_find_free_rmid(u32 closid)
-{
- struct rmid_entry *itr;
- u32 itr_idx, cmp_idx;
-
- if (list_empty(&rmid_free_lru))
- return rmid_limbo_count ? ERR_PTR(-EBUSY) : ERR_PTR(-ENOSPC);
-
- list_for_each_entry(itr, &rmid_free_lru, list) {
- /*
- * Get the index of this free RMID, and the index it would need
- * to be if it were used with this CLOSID.
- * If the CLOSID is irrelevant on this architecture, the two
- * index values are always the same on every entry and thus the
- * very first entry will be returned.
- */
- itr_idx = resctrl_arch_rmid_idx_encode(itr->closid, itr->rmid);
- cmp_idx = resctrl_arch_rmid_idx_encode(closid, itr->rmid);
-
- if (itr_idx == cmp_idx)
- return itr;
- }
-
- return ERR_PTR(-ENOSPC);
-}
-
-/**
- * resctrl_find_cleanest_closid() - Find a CLOSID where all the associated
- * RMID are clean, or the CLOSID that has
- * the most clean RMID.
- *
- * MPAM's equivalent of RMID are per-CLOSID, meaning a freshly allocated CLOSID
- * may not be able to allocate clean RMID. To avoid this the allocator will
- * choose the CLOSID with the most clean RMID.
- *
- * When the CLOSID and RMID are independent numbers, the first free CLOSID will
- * be returned.
- */
-int resctrl_find_cleanest_closid(void)
-{
- u32 cleanest_closid = ~0;
- int i = 0;
-
- lockdep_assert_held(&rdtgroup_mutex);
-
- if (!IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
- return -EIO;
-
- for (i = 0; i < closids_supported(); i++) {
- int num_dirty;
-
- if (closid_allocated(i))
- continue;
-
- num_dirty = closid_num_dirty_rmid[i];
- if (num_dirty == 0)
- return i;
-
- if (cleanest_closid == ~0)
- cleanest_closid = i;
-
- if (num_dirty < closid_num_dirty_rmid[cleanest_closid])
- cleanest_closid = i;
- }
-
- if (cleanest_closid == ~0)
- return -ENOSPC;
-
- return cleanest_closid;
-}
-
-/*
- * For MPAM the RMID value is not unique, and has to be considered with
- * the CLOSID. The (CLOSID, RMID) pair is allocated on all domains, which
- * allows all domains to be managed by a single free list.
- * Each domain also has a rmid_busy_llc to reduce the work of the limbo handler.
- */
-int alloc_rmid(u32 closid)
-{
- struct rmid_entry *entry;
-
- lockdep_assert_held(&rdtgroup_mutex);
-
- entry = resctrl_find_free_rmid(closid);
- if (IS_ERR(entry))
- return PTR_ERR(entry);
-
- list_del(&entry->list);
- return entry->rmid;
-}
-
-static void add_rmid_to_limbo(struct rmid_entry *entry)
-{
- struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
- struct rdt_domain *d;
- u32 idx;
-
- lockdep_assert_held(&rdtgroup_mutex);
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
-
- entry->busy = 0;
- list_for_each_entry(d, &r->domains, list) {
- /*
- * For the first limbo RMID in the domain,
- * setup up the limbo worker.
- */
- if (!has_busy_rmid(d))
- cqm_setup_limbo_handler(d, CQM_LIMBOCHECK_INTERVAL,
- RESCTRL_PICK_ANY_CPU);
- set_bit(idx, d->rmid_busy_llc);
- entry->busy++;
- }
-
- rmid_limbo_count++;
- if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
- closid_num_dirty_rmid[entry->closid]++;
-}
-
-void free_rmid(u32 closid, u32 rmid)
-{
- u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
- struct rmid_entry *entry;
-
- lockdep_assert_held(&rdtgroup_mutex);
-
- /*
- * Do not allow the default rmid to be free'd. Comparing by index
- * allows architectures that ignore the closid parameter to avoid an
- * unnecessary check.
- */
- if (idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
- RESCTRL_RESERVED_RMID))
- return;
-
- entry = __rmid_entry(idx);
-
- if (resctrl_arch_is_llc_occupancy_enabled())
- add_rmid_to_limbo(entry);
- else
- list_add_tail(&entry->list, &rmid_free_lru);
-}
-
-static struct mbm_state *get_mbm_state(struct rdt_domain *d, u32 closid,
- u32 rmid, enum resctrl_event_id evtid)
-{
- u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-
- switch (evtid) {
- case QOS_L3_MBM_TOTAL_EVENT_ID:
- return &d->mbm_total[idx];
- case QOS_L3_MBM_LOCAL_EVENT_ID:
- return &d->mbm_local[idx];
- default:
- return NULL;
- }
-}
-
-static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
-{
- struct mbm_state *m;
- u64 tval = 0;
-
- if (rr->first) {
- resctrl_arch_reset_rmid(rr->r, rr->d, closid, rmid, rr->evtid);
- m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
- if (m)
- memset(m, 0, sizeof(struct mbm_state));
- return 0;
- }
-
- rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid, rr->evtid,
- &tval, rr->arch_mon_ctx);
- if (rr->err)
- return rr->err;
-
- rr->val += tval;
-
- return 0;
-}
-
-/*
- * mbm_bw_count() - Update bw count from values previously read by
- * __mon_event_count().
- * @closid: The closid used to identify the cached mbm_state.
- * @rmid: The rmid used to identify the cached mbm_state.
- * @rr: The struct rmid_read populated by __mon_event_count().
- *
- * Supporting function to calculate the memory bandwidth
- * and delta bandwidth in MBps. The chunks value previously read by
- * __mon_event_count() is compared with the chunks value from the previous
- * invocation. This must be called once per second to maintain values in MBps.
- */
-static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
-{
- u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
- struct mbm_state *m = &rr->d->mbm_local[idx];
- u64 cur_bw, bytes, cur_bytes;
-
- cur_bytes = rr->val;
- bytes = cur_bytes - m->prev_bw_bytes;
- m->prev_bw_bytes = cur_bytes;
-
- cur_bw = bytes / SZ_1M;
-
- m->prev_bw = cur_bw;
-}
-
-/*
- * This is scheduled by mon_event_read() to read the CQM/MBM counters
- * on a domain.
- */
-void mon_event_count(void *info)
-{
- struct rdtgroup *rdtgrp, *entry;
- struct rmid_read *rr = info;
- struct list_head *head;
- int ret;
-
- rdtgrp = rr->rgrp;
-
- ret = __mon_event_count(rdtgrp->closid, rdtgrp->mon.rmid, rr);
-
- /*
- * For Ctrl groups read data from child monitor groups and
- * add them together. Count events which are read successfully.
- * Discard the rmid_read's reporting errors.
- */
- head = &rdtgrp->mon.crdtgrp_list;
-
- if (rdtgrp->type == RDTCTRL_GROUP) {
- list_for_each_entry(entry, head, mon.crdtgrp_list) {
- if (__mon_event_count(entry->closid, entry->mon.rmid,
- rr) == 0)
- ret = 0;
- }
- }
-
- /*
- * __mon_event_count() calls for newly created monitor groups may
- * report -EINVAL/Unavailable if the monitor hasn't seen any traffic.
- * Discard error if any of the monitor event reads succeeded.
- */
- if (ret == 0)
- rr->err = 0;
-}
-
-/*
- * Feedback loop for MBA software controller (mba_sc)
- *
- * mba_sc is a feedback loop where we periodically read MBM counters and
- * adjust the bandwidth percentage values via the IA32_MBA_THRTL_MSRs so
- * that:
- *
- * current bandwidth(cur_bw) < user specified bandwidth(user_bw)
- *
- * This uses the MBM counters to measure the bandwidth and MBA throttle
- * MSRs to control the bandwidth for a particular rdtgrp. It builds on the
- * fact that resctrl rdtgroups have both monitoring and control.
- *
- * The frequency of the checks is 1s and we just tag along the MBM overflow
- * timer. Having 1s interval makes the calculation of bandwidth simpler.
- *
- * Although MBA's goal is to restrict the bandwidth to a maximum, there may
- * be a need to increase the bandwidth to avoid unnecessarily restricting
- * the L2 <-> L3 traffic.
- *
- * Since MBA controls the L2 external bandwidth where as MBM measures the
- * L3 external bandwidth the following sequence could lead to such a
- * situation.
- *
- * Consider an rdtgroup which had high L3 <-> memory traffic in initial
- * phases -> mba_sc kicks in and reduced bandwidth percentage values -> but
- * after some time rdtgroup has mostly L2 <-> L3 traffic.
- *
- * In this case we may restrict the rdtgroup's L2 <-> L3 traffic as its
- * throttle MSRs already have low percentage values. To avoid
- * unnecessarily restricting such rdtgroups, we also increase the bandwidth.
- */
-static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
-{
- u32 closid, rmid, cur_msr_val, new_msr_val;
- struct mbm_state *pmbm_data, *cmbm_data;
- struct rdt_resource *r_mba;
- struct rdt_domain *dom_mba;
- u32 cur_bw, user_bw, idx;
- struct list_head *head;
- struct rdtgroup *entry;
-
- if (!resctrl_arch_is_mbm_local_enabled())
- return;
-
- r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
- closid = rgrp->closid;
- rmid = rgrp->mon.rmid;
- idx = resctrl_arch_rmid_idx_encode(closid, rmid);
- pmbm_data = &dom_mbm->mbm_local[idx];
-
- dom_mba = resctrl_get_domain_from_cpu(smp_processor_id(), r_mba);
- if (!dom_mba) {
- pr_warn_once("Failure to get domain for MBA update\n");
- return;
- }
-
- cur_bw = pmbm_data->prev_bw;
- user_bw = dom_mba->mbps_val[closid];
-
- /* MBA resource doesn't support CDP */
- cur_msr_val = resctrl_arch_get_config(r_mba, dom_mba, closid, CDP_NONE);
-
- /*
- * For Ctrl groups read data from child monitor groups.
- */
- head = &rgrp->mon.crdtgrp_list;
- list_for_each_entry(entry, head, mon.crdtgrp_list) {
- cmbm_data = &dom_mbm->mbm_local[entry->mon.rmid];
- cur_bw += cmbm_data->prev_bw;
- }
-
- /*
- * Scale up/down the bandwidth linearly for the ctrl group. The
- * bandwidth step is the bandwidth granularity specified by the
- * hardware.
- * Always increase throttling if current bandwidth is above the
- * target set by user.
- * But avoid thrashing up and down on every poll by checking
- * whether a decrease in throttling is likely to push the group
- * back over target. E.g. if currently throttling to 30% of bandwidth
- * on a system with 10% granularity steps, check whether moving to
- * 40% would go past the limit by multiplying current bandwidth by
- * "(30 + 10) / 30".
- */
- if (cur_msr_val > r_mba->membw.min_bw && user_bw < cur_bw) {
- new_msr_val = cur_msr_val - r_mba->membw.bw_gran;
- } else if (cur_msr_val < MAX_MBA_BW &&
- (user_bw > (cur_bw * (cur_msr_val + r_mba->membw.min_bw) / cur_msr_val))) {
- new_msr_val = cur_msr_val + r_mba->membw.bw_gran;
- } else {
- return;
- }
-
- resctrl_arch_update_one(r_mba, dom_mba, closid, CDP_NONE, new_msr_val);
-}
-
-static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
- u32 closid, u32 rmid)
-{
- struct rmid_read rr;
-
- rr.first = false;
- rr.r = r;
- rr.d = d;
-
- /*
- * This is protected from concurrent reads from user
- * as both the user and we hold the global mutex.
- */
- if (resctrl_arch_is_mbm_total_enabled()) {
- rr.evtid = QOS_L3_MBM_TOTAL_EVENT_ID;
- rr.val = 0;
- rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
- if (IS_ERR(rr.arch_mon_ctx)) {
- pr_warn_ratelimited("Failed to allocate monitor context: %ld",
- PTR_ERR(rr.arch_mon_ctx));
- return;
- }
-
- __mon_event_count(closid, rmid, &rr);
-
- resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
- }
- if (resctrl_arch_is_mbm_local_enabled()) {
- rr.evtid = QOS_L3_MBM_LOCAL_EVENT_ID;
- rr.val = 0;
- rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
- if (IS_ERR(rr.arch_mon_ctx)) {
- pr_warn_ratelimited("Failed to allocate monitor context: %ld",
- PTR_ERR(rr.arch_mon_ctx));
- return;
- }
-
- __mon_event_count(closid, rmid, &rr);
-
- /*
- * Call the MBA software controller only for the
- * control groups and when user has enabled
- * the software controller explicitly.
- */
- if (is_mba_sc(NULL))
- mbm_bw_count(closid, rmid, &rr);
-
- resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
- }
-}
-
-/*
- * Handler to scan the limbo list and move the RMIDs
- * to free list whose occupancy < threshold_occupancy.
- */
-void cqm_handle_limbo(struct work_struct *work)
-{
- unsigned long delay = msecs_to_jiffies(CQM_LIMBOCHECK_INTERVAL);
- struct rdt_domain *d;
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
-
- d = container_of(work, struct rdt_domain, cqm_limbo.work);
-
- __check_limbo(d, false);
-
- if (has_busy_rmid(d)) {
- d->cqm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
- RESCTRL_PICK_ANY_CPU);
- schedule_delayed_work_on(d->cqm_work_cpu, &d->cqm_limbo,
- delay);
- }
-
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
-}
-
-/**
- * cqm_setup_limbo_handler() - Schedule the limbo handler to run for this
- * domain.
- * @dom: The domain the limbo handler should run for.
- * @delay_ms: How far in the future the handler should run.
- * @exclude_cpu: Which CPU the handler should not run on,
- * RESCTRL_PICK_ANY_CPU to pick any CPU.
- */
-void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
- int exclude_cpu)
-{
- unsigned long delay = msecs_to_jiffies(delay_ms);
- int cpu;
-
- cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
- dom->cqm_work_cpu = cpu;
-
- if (cpu < nr_cpu_ids)
- schedule_delayed_work_on(cpu, &dom->cqm_limbo, delay);
-}
-
-void mbm_handle_overflow(struct work_struct *work)
-{
- unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
- struct rdtgroup *prgrp, *crgrp;
- struct list_head *head;
- struct rdt_resource *r;
- struct rdt_domain *d;
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
-
- /*
- * If the filesystem has been unmounted this work no longer needs to
- * run.
- */
- if (!resctrl_mounted || !resctrl_arch_mon_capable())
- goto out_unlock;
-
- r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
- d = container_of(work, struct rdt_domain, mbm_over.work);
-
- list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
- mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
-
- head = &prgrp->mon.crdtgrp_list;
- list_for_each_entry(crgrp, head, mon.crdtgrp_list)
- mbm_update(r, d, crgrp->closid, crgrp->mon.rmid);
-
- if (is_mba_sc(NULL))
- update_mba_bw(prgrp, d);
- }
-
- /*
- * Re-check for housekeeping CPUs. This allows the overflow handler to
- * move off a nohz_full CPU quickly.
- */
- d->mbm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
- RESCTRL_PICK_ANY_CPU);
- schedule_delayed_work_on(d->mbm_work_cpu, &d->mbm_over, delay);
-
-out_unlock:
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
-}
-
-/**
- * mbm_setup_overflow_handler() - Schedule the overflow handler to run for this
- * domain.
- * @dom: The domain the overflow handler should run for.
- * @delay_ms: How far in the future the handler should run.
- * @exclude_cpu: Which CPU the handler should not run on,
- * RESCTRL_PICK_ANY_CPU to pick any CPU.
- */
-void mbm_setup_overflow_handler(struct rdt_domain *dom, unsigned long delay_ms,
- int exclude_cpu)
-{
- unsigned long delay = msecs_to_jiffies(delay_ms);
- int cpu;
-
- /*
- * When a domain comes online there is no guarantee the filesystem is
- * mounted. If not, there is no need to catch counter overflow.
- */
- if (!resctrl_mounted || !resctrl_arch_mon_capable())
- return;
- cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
- dom->mbm_work_cpu = cpu;
-
- if (cpu < nr_cpu_ids)
- schedule_delayed_work_on(cpu, &dom->mbm_over, delay);
-}
-
-static int dom_data_init(struct rdt_resource *r)
-{
- u32 idx_limit = resctrl_arch_system_num_rmid_idx();
- u32 num_closid = resctrl_arch_get_num_closid(r);
- struct rmid_entry *entry = NULL;
- int err = 0, i;
- u32 idx;
-
- mutex_lock(&rdtgroup_mutex);
- if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
- u32 *tmp;
-
- /*
- * If the architecture hasn't provided a sanitised value here,
- * this may result in larger arrays than necessary. Resctrl will
- * use a smaller system wide value based on the resources in
- * use.
- */
- tmp = kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL);
- if (!tmp) {
- err = -ENOMEM;
- goto out_unlock;
- }
-
- closid_num_dirty_rmid = tmp;
- }
-
- rmid_ptrs = kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL);
- if (!rmid_ptrs) {
- if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
- kfree(closid_num_dirty_rmid);
- closid_num_dirty_rmid = NULL;
- }
- err = -ENOMEM;
- goto out_unlock;
- }
-
- for (i = 0; i < idx_limit; i++) {
- entry = &rmid_ptrs[i];
- INIT_LIST_HEAD(&entry->list);
-
- resctrl_arch_rmid_idx_decode(i, &entry->closid, &entry->rmid);
- list_add_tail(&entry->list, &rmid_free_lru);
- }
-
- /*
- * RESCTRL_RESERVED_CLOSID and RESCTRL_RESERVED_RMID are special and
- * are always allocated. These are used for the rdtgroup_default
- * control group, which will be setup later in resctrl_init().
- */
- idx = resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
- RESCTRL_RESERVED_RMID);
- entry = __rmid_entry(idx);
- list_del(&entry->list);
-
-out_unlock:
- mutex_unlock(&rdtgroup_mutex);
-
- return err;
-}
-
-static void dom_data_exit(struct rdt_resource *r)
-{
- if (!r->mon_capable)
- return;
-
- mutex_lock(&rdtgroup_mutex);
- if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
- kfree(closid_num_dirty_rmid);
- closid_num_dirty_rmid = NULL;
- }
-
- kfree(rmid_ptrs);
- rmid_ptrs = NULL;
-
- mutex_unlock(&rdtgroup_mutex);
-}
-
-static struct mon_evt llc_occupancy_event = {
- .name = "llc_occupancy",
- .evtid = QOS_L3_OCCUP_EVENT_ID,
-};
-
-static struct mon_evt mbm_total_event = {
- .name = "mbm_total_bytes",
- .evtid = QOS_L3_MBM_TOTAL_EVENT_ID,
-};
-
-static struct mon_evt mbm_local_event = {
- .name = "mbm_local_bytes",
- .evtid = QOS_L3_MBM_LOCAL_EVENT_ID,
-};
-
-/*
- * Initialize the event list for the resource.
- *
- * Note that MBM events are also part of RDT_RESOURCE_L3 resource
- * because as per the SDM the total and local memory bandwidth
- * are enumerated as part of L3 monitoring.
- */
-static void l3_mon_evt_init(struct rdt_resource *r)
-{
- INIT_LIST_HEAD(&r->evt_list);
-
- if (resctrl_arch_is_llc_occupancy_enabled())
- list_add_tail(&llc_occupancy_event.list, &r->evt_list);
- if (resctrl_arch_is_mbm_total_enabled())
- list_add_tail(&mbm_total_event.list, &r->evt_list);
- if (resctrl_arch_is_mbm_local_enabled())
- list_add_tail(&mbm_local_event.list, &r->evt_list);
-}
-
-int resctrl_mon_resource_init(void)
-{
- struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
- int ret;
-
- if (!r->mon_capable)
- return 0;
-
- ret = dom_data_init(r);
- if (ret)
- return ret;
-
- l3_mon_evt_init(r);
-
- if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
- mbm_total_event.configurable = true;
- mbm_config_rftype_init("mbm_total_bytes_config");
- }
- if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
- mbm_local_event.configurable = true;
- mbm_config_rftype_init("mbm_local_bytes_config");
- }
-
- return 0;
-}
-
int __init rdt_get_mon_l3_config(struct rdt_resource *r)
{
unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
@@ -1076,13 +262,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
return 0;
}
-void resctrl_mon_resource_exit(void)
-{
- struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-
- dom_data_exit(r);
-}
-
void __init intel_rdt_mbm_apply_quirk(void)
{
int cf_index;
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 41eea46e62aa..1488d1728f1f 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -39,28 +39,6 @@
*/
static u64 prefetch_disable_bits;
-/*
- * Major number assigned to and shared by all devices exposing
- * pseudo-locked regions.
- */
-static unsigned int pseudo_lock_major;
-static unsigned long pseudo_lock_minor_avail = GENMASK(MINORBITS, 0);
-
-static char *pseudo_lock_devnode(const struct device *dev, umode_t *mode)
-{
- const struct rdtgroup *rdtgrp;
-
- rdtgrp = dev_get_drvdata(dev);
- if (mode)
- *mode = 0600;
- return kasprintf(GFP_KERNEL, "pseudo_lock/%s", rdtgrp->kn->name);
-}
-
-static const struct class pseudo_lock_class = {
- .name = "pseudo_lock",
- .devnode = pseudo_lock_devnode,
-};
-
/**
* resctrl_arch_get_prefetch_disable_bits - prefetch disable bits of supported
* platforms
@@ -121,299 +99,6 @@ u64 resctrl_arch_get_prefetch_disable_bits(void)
return prefetch_disable_bits;
}
-/**
- * pseudo_lock_minor_get - Obtain available minor number
- * @minor: Pointer to where new minor number will be stored
- *
- * A bitmask is used to track available minor numbers. Here the next free
- * minor number is marked as unavailable and returned.
- *
- * Return: 0 on success, <0 on failure.
- */
-static int pseudo_lock_minor_get(unsigned int *minor)
-{
- unsigned long first_bit;
-
- first_bit = find_first_bit(&pseudo_lock_minor_avail, MINORBITS);
-
- if (first_bit == MINORBITS)
- return -ENOSPC;
-
- __clear_bit(first_bit, &pseudo_lock_minor_avail);
- *minor = first_bit;
-
- return 0;
-}
-
-/**
- * pseudo_lock_minor_release - Return minor number to available
- * @minor: The minor number made available
- */
-static void pseudo_lock_minor_release(unsigned int minor)
-{
- __set_bit(minor, &pseudo_lock_minor_avail);
-}
-
-/**
- * region_find_by_minor - Locate a pseudo-lock region by inode minor number
- * @minor: The minor number of the device representing pseudo-locked region
- *
- * When the character device is accessed we need to determine which
- * pseudo-locked region it belongs to. This is done by matching the minor
- * number of the device to the pseudo-locked region it belongs.
- *
- * Minor numbers are assigned at the time a pseudo-locked region is associated
- * with a cache instance.
- *
- * Return: On success return pointer to resource group owning the pseudo-locked
- * region, NULL on failure.
- */
-static struct rdtgroup *region_find_by_minor(unsigned int minor)
-{
- struct rdtgroup *rdtgrp, *rdtgrp_match = NULL;
-
- list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
- if (rdtgrp->plr && rdtgrp->plr->minor == minor) {
- rdtgrp_match = rdtgrp;
- break;
- }
- }
- return rdtgrp_match;
-}
-
-/**
- * struct pseudo_lock_pm_req - A power management QoS request list entry
- * @list: Entry within the @pm_reqs list for a pseudo-locked region
- * @req: PM QoS request
- */
-struct pseudo_lock_pm_req {
- struct list_head list;
- struct dev_pm_qos_request req;
-};
-
-static void pseudo_lock_cstates_relax(struct pseudo_lock_region *plr)
-{
- struct pseudo_lock_pm_req *pm_req, *next;
-
- list_for_each_entry_safe(pm_req, next, &plr->pm_reqs, list) {
- dev_pm_qos_remove_request(&pm_req->req);
- list_del(&pm_req->list);
- kfree(pm_req);
- }
-}
-
-/**
- * pseudo_lock_cstates_constrain - Restrict cores from entering C6
- * @plr: Pseudo-locked region
- *
- * To prevent the cache from being affected by power management entering
- * C6 has to be avoided. This is accomplished by requesting a latency
- * requirement lower than lowest C6 exit latency of all supported
- * platforms as found in the cpuidle state tables in the intel_idle driver.
- * At this time it is possible to do so with a single latency requirement
- * for all supported platforms.
- *
- * Since Goldmont is supported, which is affected by X86_BUG_MONITOR,
- * the ACPI latencies need to be considered while keeping in mind that C2
- * may be set to map to deeper sleep states. In this case the latency
- * requirement needs to prevent entering C2 also.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_cstates_constrain(struct pseudo_lock_region *plr)
-{
- struct pseudo_lock_pm_req *pm_req;
- int cpu;
- int ret;
-
- for_each_cpu(cpu, &plr->d->cpu_mask) {
- pm_req = kzalloc(sizeof(*pm_req), GFP_KERNEL);
- if (!pm_req) {
- rdt_last_cmd_puts("Failure to allocate memory for PM QoS\n");
- ret = -ENOMEM;
- goto out_err;
- }
- ret = dev_pm_qos_add_request(get_cpu_device(cpu),
- &pm_req->req,
- DEV_PM_QOS_RESUME_LATENCY,
- 30);
- if (ret < 0) {
- rdt_last_cmd_printf("Failed to add latency req CPU%d\n",
- cpu);
- kfree(pm_req);
- ret = -1;
- goto out_err;
- }
- list_add(&pm_req->list, &plr->pm_reqs);
- }
-
- return 0;
-
-out_err:
- pseudo_lock_cstates_relax(plr);
- return ret;
-}
-
-/**
- * pseudo_lock_region_clear - Reset pseudo-lock region data
- * @plr: pseudo-lock region
- *
- * All content of the pseudo-locked region is reset - any memory allocated
- * freed.
- *
- * Return: void
- */
-static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
-{
- plr->size = 0;
- plr->line_size = 0;
- kfree(plr->kmem);
- plr->kmem = NULL;
- plr->s = NULL;
- if (plr->d)
- plr->d->plr = NULL;
- plr->d = NULL;
- plr->cbm = 0;
- plr->debugfs_dir = NULL;
-}
-
-/**
- * pseudo_lock_region_init - Initialize pseudo-lock region information
- * @plr: pseudo-lock region
- *
- * Called after user provided a schemata to be pseudo-locked. From the
- * schemata the &struct pseudo_lock_region is on entry already initialized
- * with the resource, domain, and capacity bitmask. Here the information
- * required for pseudo-locking is deduced from this data and &struct
- * pseudo_lock_region initialized further. This information includes:
- * - size in bytes of the region to be pseudo-locked
- * - cache line size to know the stride with which data needs to be accessed
- * to be pseudo-locked
- * - a cpu associated with the cache instance on which the pseudo-locking
- * flow can be executed
- *
- * Return: 0 on success, <0 on failure. Descriptive error will be written
- * to last_cmd_status buffer.
- */
-static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
-{
- struct cpu_cacheinfo *ci;
- int ret;
- int i;
-
- /* Pick the first cpu we find that is associated with the cache. */
- plr->cpu = cpumask_first(&plr->d->cpu_mask);
-
- if (!cpu_online(plr->cpu)) {
- rdt_last_cmd_printf("CPU %u associated with cache not online\n",
- plr->cpu);
- ret = -ENODEV;
- goto out_region;
- }
-
- ci = get_cpu_cacheinfo(plr->cpu);
-
- plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
-
- for (i = 0; i < ci->num_leaves; i++) {
- if (ci->info_list[i].level == plr->s->res->cache_level) {
- plr->line_size = ci->info_list[i].coherency_line_size;
- return 0;
- }
- }
-
- ret = -1;
- rdt_last_cmd_puts("Unable to determine cache line size\n");
-out_region:
- pseudo_lock_region_clear(plr);
- return ret;
-}
-
-/**
- * pseudo_lock_init - Initialize a pseudo-lock region
- * @rdtgrp: resource group to which new pseudo-locked region will belong
- *
- * A pseudo-locked region is associated with a resource group. When this
- * association is created the pseudo-locked region is initialized. The
- * details of the pseudo-locked region are not known at this time so only
- * allocation is done and association established.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_init(struct rdtgroup *rdtgrp)
-{
- struct pseudo_lock_region *plr;
-
- plr = kzalloc(sizeof(*plr), GFP_KERNEL);
- if (!plr)
- return -ENOMEM;
-
- init_waitqueue_head(&plr->lock_thread_wq);
- INIT_LIST_HEAD(&plr->pm_reqs);
- rdtgrp->plr = plr;
- return 0;
-}
-
-/**
- * pseudo_lock_region_alloc - Allocate kernel memory that will be pseudo-locked
- * @plr: pseudo-lock region
- *
- * Initialize the details required to set up the pseudo-locked region and
- * allocate the contiguous memory that will be pseudo-locked to the cache.
- *
- * Return: 0 on success, <0 on failure. Descriptive error will be written
- * to last_cmd_status buffer.
- */
-static int pseudo_lock_region_alloc(struct pseudo_lock_region *plr)
-{
- int ret;
-
- ret = pseudo_lock_region_init(plr);
- if (ret < 0)
- return ret;
-
- /*
- * We do not yet support contiguous regions larger than
- * KMALLOC_MAX_SIZE.
- */
- if (plr->size > KMALLOC_MAX_SIZE) {
- rdt_last_cmd_puts("Requested region exceeds maximum size\n");
- ret = -E2BIG;
- goto out_region;
- }
-
- plr->kmem = kzalloc(plr->size, GFP_KERNEL);
- if (!plr->kmem) {
- rdt_last_cmd_puts("Unable to allocate memory\n");
- ret = -ENOMEM;
- goto out_region;
- }
-
- ret = 0;
- goto out;
-out_region:
- pseudo_lock_region_clear(plr);
-out:
- return ret;
-}
-
-/**
- * pseudo_lock_free - Free a pseudo-locked region
- * @rdtgrp: resource group to which pseudo-locked region belonged
- *
- * The pseudo-locked region's resources have already been released, or not
- * yet created at this point. Now it can be freed and disassociated from the
- * resource group.
- *
- * Return: void
- */
-static void pseudo_lock_free(struct rdtgroup *rdtgrp)
-{
- pseudo_lock_region_clear(rdtgrp->plr);
- kfree(rdtgrp->plr);
- rdtgrp->plr = NULL;
-}
-
/**
* resctrl_arch_pseudo_lock_fn - Load kernel memory into cache
* @_plr: the pseudo-lock region descriptor
@@ -543,345 +228,6 @@ int resctrl_arch_pseudo_lock_fn(void *_plr)
return 0;
}
-/**
- * rdtgroup_monitor_in_progress - Test if monitoring in progress
- * @rdtgrp: resource group being queried
- *
- * Return: 1 if monitor groups have been created for this resource
- * group, 0 otherwise.
- */
-static int rdtgroup_monitor_in_progress(struct rdtgroup *rdtgrp)
-{
- return !list_empty(&rdtgrp->mon.crdtgrp_list);
-}
-
-/**
- * rdtgroup_locksetup_user_restrict - Restrict user access to group
- * @rdtgrp: resource group needing access restricted
- *
- * A resource group used for cache pseudo-locking cannot have cpus or tasks
- * assigned to it. This is communicated to the user by restricting access
- * to all the files that can be used to make such changes.
- *
- * Permissions restored with rdtgroup_locksetup_user_restore()
- *
- * Return: 0 on success, <0 on failure. If a failure occurs during the
- * restriction of access an attempt will be made to restore permissions but
- * the state of the mode of these files will be uncertain when a failure
- * occurs.
- */
-static int rdtgroup_locksetup_user_restrict(struct rdtgroup *rdtgrp)
-{
- int ret;
-
- ret = rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
- if (ret)
- return ret;
-
- ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
- if (ret)
- goto err_tasks;
-
- ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
- if (ret)
- goto err_cpus;
-
- if (resctrl_arch_mon_capable()) {
- ret = rdtgroup_kn_mode_restrict(rdtgrp, "mon_groups");
- if (ret)
- goto err_cpus_list;
- }
-
- ret = 0;
- goto out;
-
-err_cpus_list:
- rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
-err_cpus:
- rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
-err_tasks:
- rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
-out:
- return ret;
-}
-
-/**
- * rdtgroup_locksetup_user_restore - Restore user access to group
- * @rdtgrp: resource group needing access restored
- *
- * Restore all file access previously removed using
- * rdtgroup_locksetup_user_restrict()
- *
- * Return: 0 on success, <0 on failure. If a failure occurs during the
- * restoration of access an attempt will be made to restrict permissions
- * again but the state of the mode of these files will be uncertain when
- * a failure occurs.
- */
-static int rdtgroup_locksetup_user_restore(struct rdtgroup *rdtgrp)
-{
- int ret;
-
- ret = rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
- if (ret)
- return ret;
-
- ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
- if (ret)
- goto err_tasks;
-
- ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
- if (ret)
- goto err_cpus;
-
- if (resctrl_arch_mon_capable()) {
- ret = rdtgroup_kn_mode_restore(rdtgrp, "mon_groups", 0777);
- if (ret)
- goto err_cpus_list;
- }
-
- ret = 0;
- goto out;
-
-err_cpus_list:
- rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
-err_cpus:
- rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
-err_tasks:
- rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
-out:
- return ret;
-}
-
-/**
- * rdtgroup_locksetup_enter - Resource group enters locksetup mode
- * @rdtgrp: resource group requested to enter locksetup mode
- *
- * A resource group enters locksetup mode to reflect that it would be used
- * to represent a pseudo-locked region and is in the process of being set
- * up to do so. A resource group used for a pseudo-locked region would
- * lose the closid associated with it so we cannot allow it to have any
- * tasks or cpus assigned nor permit tasks or cpus to be assigned in the
- * future. Monitoring of a pseudo-locked region is not allowed either.
- *
- * The above and more restrictions on a pseudo-locked region are checked
- * for and enforced before the resource group enters the locksetup mode.
- *
- * Returns: 0 if the resource group successfully entered locksetup mode, <0
- * on failure. On failure the last_cmd_status buffer is updated with text to
- * communicate details of failure to the user.
- */
-int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
-{
- int ret;
-
- /*
- * The default resource group can neither be removed nor lose the
- * default closid associated with it.
- */
- if (rdtgrp == &rdtgroup_default) {
- rdt_last_cmd_puts("Cannot pseudo-lock default group\n");
- return -EINVAL;
- }
-
- /*
- * Cache Pseudo-locking not supported when CDP is enabled.
- *
- * Some things to consider if you would like to enable this
- * support (using L3 CDP as example):
- * - When CDP is enabled two separate resources are exposed,
- * L3DATA and L3CODE, but they are actually on the same cache.
- * The implication for pseudo-locking is that if a
- * pseudo-locked region is created on a domain of one
- * resource (eg. L3CODE), then a pseudo-locked region cannot
- * be created on that same domain of the other resource
- * (eg. L3DATA). This is because the creation of a
- * pseudo-locked region involves a call to wbinvd that will
- * affect all cache allocations on particular domain.
- * - Considering the previous, it may be possible to only
- * expose one of the CDP resources to pseudo-locking and
- * hide the other. For example, we could consider to only
- * expose L3DATA and since the L3 cache is unified it is
- * still possible to place instructions there are execute it.
- * - If only one region is exposed to pseudo-locking we should
- * still keep in mind that availability of a portion of cache
- * for pseudo-locking should take into account both resources.
- * Similarly, if a pseudo-locked region is created in one
- * resource, the portion of cache used by it should be made
- * unavailable to all future allocations from both resources.
- */
- if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3) ||
- resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) {
- rdt_last_cmd_puts("CDP enabled\n");
- return -EINVAL;
- }
-
- /*
- * Not knowing the bits to disable prefetching implies that this
- * platform does not support Cache Pseudo-Locking.
- */
- if (resctrl_arch_get_prefetch_disable_bits() == 0) {
- rdt_last_cmd_puts("Pseudo-locking not supported\n");
- return -EINVAL;
- }
-
- if (rdtgroup_monitor_in_progress(rdtgrp)) {
- rdt_last_cmd_puts("Monitoring in progress\n");
- return -EINVAL;
- }
-
- if (rdtgroup_tasks_assigned(rdtgrp)) {
- rdt_last_cmd_puts("Tasks assigned to resource group\n");
- return -EINVAL;
- }
-
- if (!cpumask_empty(&rdtgrp->cpu_mask)) {
- rdt_last_cmd_puts("CPUs assigned to resource group\n");
- return -EINVAL;
- }
-
- if (rdtgroup_locksetup_user_restrict(rdtgrp)) {
- rdt_last_cmd_puts("Unable to modify resctrl permissions\n");
- return -EIO;
- }
-
- ret = pseudo_lock_init(rdtgrp);
- if (ret) {
- rdt_last_cmd_puts("Unable to init pseudo-lock region\n");
- goto out_release;
- }
-
- /*
- * If this system is capable of monitoring a rmid would have been
- * allocated when the control group was created. This is not needed
- * anymore when this group would be used for pseudo-locking. This
- * is safe to call on platforms not capable of monitoring.
- */
- free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
- ret = 0;
- goto out;
-
-out_release:
- rdtgroup_locksetup_user_restore(rdtgrp);
-out:
- return ret;
-}
-
-/**
- * rdtgroup_locksetup_exit - resource group exist locksetup mode
- * @rdtgrp: resource group
- *
- * When a resource group exits locksetup mode the earlier restrictions are
- * lifted.
- *
- * Return: 0 on success, <0 on failure
- */
-int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
-{
- int ret;
-
- if (resctrl_arch_mon_capable()) {
- ret = alloc_rmid(rdtgrp->closid);
- if (ret < 0) {
- rdt_last_cmd_puts("Out of RMIDs\n");
- return ret;
- }
- rdtgrp->mon.rmid = ret;
- }
-
- ret = rdtgroup_locksetup_user_restore(rdtgrp);
- if (ret) {
- free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
- return ret;
- }
-
- pseudo_lock_free(rdtgrp);
- return 0;
-}
-
-/**
- * rdtgroup_cbm_overlaps_pseudo_locked - Test if CBM or portion is pseudo-locked
- * @d: RDT domain
- * @cbm: CBM to test
- *
- * @d represents a cache instance and @cbm a capacity bitmask that is
- * considered for it. Determine if @cbm overlaps with any existing
- * pseudo-locked region on @d.
- *
- * @cbm is unsigned long, even if only 32 bits are used, to make the
- * bitmap functions work correctly.
- *
- * Return: true if @cbm overlaps with pseudo-locked region on @d, false
- * otherwise.
- */
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
-{
- unsigned int cbm_len;
- unsigned long cbm_b;
-
- if (d->plr) {
- cbm_len = d->plr->s->res->cache.cbm_len;
- cbm_b = d->plr->cbm;
- if (bitmap_intersects(&cbm, &cbm_b, cbm_len))
- return true;
- }
- return false;
-}
-
-/**
- * rdtgroup_pseudo_locked_in_hierarchy - Pseudo-locked region in cache hierarchy
- * @d: RDT domain under test
- *
- * The setup of a pseudo-locked region affects all cache instances within
- * the hierarchy of the region. It is thus essential to know if any
- * pseudo-locked regions exist within a cache hierarchy to prevent any
- * attempts to create new pseudo-locked regions in the same hierarchy.
- *
- * Return: true if a pseudo-locked region exists in the hierarchy of @d or
- * if it is not possible to test due to memory allocation issue,
- * false otherwise.
- */
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
-{
- cpumask_var_t cpu_with_psl;
- enum resctrl_res_level i;
- struct rdt_resource *r;
- struct rdt_domain *d_i;
- bool ret = false;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- if (!zalloc_cpumask_var(&cpu_with_psl, GFP_KERNEL))
- return true;
-
- /*
- * First determine which cpus have pseudo-locked regions
- * associated with them.
- */
- for (i = 0; i < RDT_NUM_RESOURCES; i++) {
- r = resctrl_arch_get_resource(i);
- if (!r->alloc_capable)
- continue;
-
- list_for_each_entry(d_i, &r->domains, list) {
- if (d_i->plr)
- cpumask_or(cpu_with_psl, cpu_with_psl,
- &d_i->cpu_mask);
- }
- }
-
- /*
- * Next test if new pseudo-locked region would intersect with
- * existing region.
- */
- if (cpumask_intersects(&d->cpu_mask, cpu_with_psl))
- ret = true;
-
- free_cpumask_var(cpu_with_psl);
- return ret;
-}
-
/**
* resctrl_arch_measure_cycles_lat_fn - Measure cycle latency to read
* pseudo-locked memory
@@ -1174,442 +520,3 @@ int resctrl_arch_measure_l3_residency(void *_plr)
wake_up_interruptible(&plr->lock_thread_wq);
return 0;
}
-
-/**
- * pseudo_lock_measure_cycles - Trigger latency measure to pseudo-locked region
- * @rdtgrp: Resource group to which the pseudo-locked region belongs.
- * @sel: Selector of which measurement to perform on a pseudo-locked region.
- *
- * The measurement of latency to access a pseudo-locked region should be
- * done from a cpu that is associated with that pseudo-locked region.
- * Determine which cpu is associated with this region and start a thread on
- * that cpu to perform the measurement, wait for that thread to complete.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
-{
- struct pseudo_lock_region *plr = rdtgrp->plr;
- struct task_struct *thread;
- unsigned int cpu;
- int ret = -1;
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
-
- if (rdtgrp->flags & RDT_DELETED) {
- ret = -ENODEV;
- goto out;
- }
-
- if (!plr->d) {
- ret = -ENODEV;
- goto out;
- }
-
- plr->thread_done = 0;
- cpu = cpumask_first(&plr->d->cpu_mask);
- if (!cpu_online(cpu)) {
- ret = -ENODEV;
- goto out;
- }
-
- plr->cpu = cpu;
-
- if (sel == 1)
- thread = kthread_create_on_node(resctrl_arch_measure_cycles_lat_fn,
- plr, cpu_to_node(cpu),
- "pseudo_lock_measure/%u",
- cpu);
- else if (sel == 2)
- thread = kthread_create_on_node(resctrl_arch_measure_l2_residency,
- plr, cpu_to_node(cpu),
- "pseudo_lock_measure/%u",
- cpu);
- else if (sel == 3)
- thread = kthread_create_on_node(resctrl_arch_measure_l3_residency,
- plr, cpu_to_node(cpu),
- "pseudo_lock_measure/%u",
- cpu);
- else
- goto out;
-
- if (IS_ERR(thread)) {
- ret = PTR_ERR(thread);
- goto out;
- }
- kthread_bind(thread, cpu);
- wake_up_process(thread);
-
- ret = wait_event_interruptible(plr->lock_thread_wq,
- plr->thread_done == 1);
- if (ret < 0)
- goto out;
-
- ret = 0;
-
-out:
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
- return ret;
-}
-
-static ssize_t pseudo_lock_measure_trigger(struct file *file,
- const char __user *user_buf,
- size_t count, loff_t *ppos)
-{
- struct rdtgroup *rdtgrp = file->private_data;
- size_t buf_size;
- char buf[32];
- int ret;
- int sel;
-
- buf_size = min(count, (sizeof(buf) - 1));
- if (copy_from_user(buf, user_buf, buf_size))
- return -EFAULT;
-
- buf[buf_size] = '\0';
- ret = kstrtoint(buf, 10, &sel);
- if (ret == 0) {
- if (sel != 1 && sel != 2 && sel != 3)
- return -EINVAL;
- ret = debugfs_file_get(file->f_path.dentry);
- if (ret)
- return ret;
- ret = pseudo_lock_measure_cycles(rdtgrp, sel);
- if (ret == 0)
- ret = count;
- debugfs_file_put(file->f_path.dentry);
- }
-
- return ret;
-}
-
-static const struct file_operations pseudo_measure_fops = {
- .write = pseudo_lock_measure_trigger,
- .open = simple_open,
- .llseek = default_llseek,
-};
-
-/**
- * rdtgroup_pseudo_lock_create - Create a pseudo-locked region
- * @rdtgrp: resource group to which pseudo-lock region belongs
- *
- * Called when a resource group in the pseudo-locksetup mode receives a
- * valid schemata that should be pseudo-locked. Since the resource group is
- * in pseudo-locksetup mode the &struct pseudo_lock_region has already been
- * allocated and initialized with the essential information. If a failure
- * occurs the resource group remains in the pseudo-locksetup mode with the
- * &struct pseudo_lock_region associated with it, but cleared from all
- * information and ready for the user to re-attempt pseudo-locking by
- * writing the schemata again.
- *
- * Return: 0 if the pseudo-locked region was successfully pseudo-locked, <0
- * on failure. Descriptive error will be written to last_cmd_status buffer.
- */
-int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
-{
- struct pseudo_lock_region *plr = rdtgrp->plr;
- struct task_struct *thread;
- unsigned int new_minor;
- struct device *dev;
- int ret;
-
- ret = pseudo_lock_region_alloc(plr);
- if (ret < 0)
- return ret;
-
- ret = pseudo_lock_cstates_constrain(plr);
- if (ret < 0) {
- ret = -EINVAL;
- goto out_region;
- }
-
- plr->thread_done = 0;
-
- plr->closid = rdtgrp->closid;
- thread = kthread_create_on_node(resctrl_arch_pseudo_lock_fn, plr,
- cpu_to_node(plr->cpu),
- "pseudo_lock/%u", plr->cpu);
- if (IS_ERR(thread)) {
- ret = PTR_ERR(thread);
- rdt_last_cmd_printf("Locking thread returned error %d\n", ret);
- goto out_cstates;
- }
-
- kthread_bind(thread, plr->cpu);
- wake_up_process(thread);
-
- ret = wait_event_interruptible(plr->lock_thread_wq,
- plr->thread_done == 1);
- if (ret < 0) {
- /*
- * If the thread does not get on the CPU for whatever
- * reason and the process which sets up the region is
- * interrupted then this will leave the thread in runnable
- * state and once it gets on the CPU it will dereference
- * the cleared, but not freed, plr struct resulting in an
- * empty pseudo-locking loop.
- */
- rdt_last_cmd_puts("Locking thread interrupted\n");
- goto out_cstates;
- }
-
- ret = pseudo_lock_minor_get(&new_minor);
- if (ret < 0) {
- rdt_last_cmd_puts("Unable to obtain a new minor number\n");
- goto out_cstates;
- }
-
- /*
- * Unlock access but do not release the reference. The
- * pseudo-locked region will still be here on return.
- *
- * The mutex has to be released temporarily to avoid a potential
- * deadlock with the mm->mmap_lock which is obtained in the
- * device_create() and debugfs_create_dir() callpath below as well as
- * before the mmap() callback is called.
- */
- mutex_unlock(&rdtgroup_mutex);
-
- if (!IS_ERR_OR_NULL(debugfs_resctrl)) {
- plr->debugfs_dir = debugfs_create_dir(rdtgrp->kn->name,
- debugfs_resctrl);
- if (!IS_ERR_OR_NULL(plr->debugfs_dir))
- debugfs_create_file("pseudo_lock_measure", 0200,
- plr->debugfs_dir, rdtgrp,
- &pseudo_measure_fops);
- }
-
- dev = device_create(&pseudo_lock_class, NULL,
- MKDEV(pseudo_lock_major, new_minor),
- rdtgrp, "%s", rdtgrp->kn->name);
-
- mutex_lock(&rdtgroup_mutex);
-
- if (IS_ERR(dev)) {
- ret = PTR_ERR(dev);
- rdt_last_cmd_printf("Failed to create character device: %d\n",
- ret);
- goto out_debugfs;
- }
-
- /* We released the mutex - check if group was removed while we did so */
- if (rdtgrp->flags & RDT_DELETED) {
- ret = -ENODEV;
- goto out_device;
- }
-
- plr->minor = new_minor;
-
- rdtgrp->mode = RDT_MODE_PSEUDO_LOCKED;
- closid_free(rdtgrp->closid);
- rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0444);
- rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0444);
-
- ret = 0;
- goto out;
-
-out_device:
- device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, new_minor));
-out_debugfs:
- debugfs_remove_recursive(plr->debugfs_dir);
- pseudo_lock_minor_release(new_minor);
-out_cstates:
- pseudo_lock_cstates_relax(plr);
-out_region:
- pseudo_lock_region_clear(plr);
-out:
- return ret;
-}
-
-/**
- * rdtgroup_pseudo_lock_remove - Remove a pseudo-locked region
- * @rdtgrp: resource group to which the pseudo-locked region belongs
- *
- * The removal of a pseudo-locked region can be initiated when the resource
- * group is removed from user space via a "rmdir" from userspace or the
- * unmount of the resctrl filesystem. On removal the resource group does
- * not go back to pseudo-locksetup mode before it is removed, instead it is
- * removed directly. There is thus asymmetry with the creation where the
- * &struct pseudo_lock_region is removed here while it was not created in
- * rdtgroup_pseudo_lock_create().
- *
- * Return: void
- */
-void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp)
-{
- struct pseudo_lock_region *plr = rdtgrp->plr;
-
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- /*
- * Default group cannot be a pseudo-locked region so we can
- * free closid here.
- */
- closid_free(rdtgrp->closid);
- goto free;
- }
-
- pseudo_lock_cstates_relax(plr);
- debugfs_remove_recursive(rdtgrp->plr->debugfs_dir);
- device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, plr->minor));
- pseudo_lock_minor_release(plr->minor);
-
-free:
- pseudo_lock_free(rdtgrp);
-}
-
-static int pseudo_lock_dev_open(struct inode *inode, struct file *filp)
-{
- struct rdtgroup *rdtgrp;
-
- mutex_lock(&rdtgroup_mutex);
-
- rdtgrp = region_find_by_minor(iminor(inode));
- if (!rdtgrp) {
- mutex_unlock(&rdtgroup_mutex);
- return -ENODEV;
- }
-
- filp->private_data = rdtgrp;
- atomic_inc(&rdtgrp->waitcount);
- /* Perform a non-seekable open - llseek is not supported */
- filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
-
- mutex_unlock(&rdtgroup_mutex);
-
- return 0;
-}
-
-static int pseudo_lock_dev_release(struct inode *inode, struct file *filp)
-{
- struct rdtgroup *rdtgrp;
-
- mutex_lock(&rdtgroup_mutex);
- rdtgrp = filp->private_data;
- WARN_ON(!rdtgrp);
- if (!rdtgrp) {
- mutex_unlock(&rdtgroup_mutex);
- return -ENODEV;
- }
- filp->private_data = NULL;
- atomic_dec(&rdtgrp->waitcount);
- mutex_unlock(&rdtgroup_mutex);
- return 0;
-}
-
-static int pseudo_lock_dev_mremap(struct vm_area_struct *area)
-{
- /* Not supported */
- return -EINVAL;
-}
-
-static const struct vm_operations_struct pseudo_mmap_ops = {
- .mremap = pseudo_lock_dev_mremap,
-};
-
-static int pseudo_lock_dev_mmap(struct file *filp, struct vm_area_struct *vma)
-{
- unsigned long vsize = vma->vm_end - vma->vm_start;
- unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
- struct pseudo_lock_region *plr;
- struct rdtgroup *rdtgrp;
- unsigned long physical;
- unsigned long psize;
-
- mutex_lock(&rdtgroup_mutex);
-
- rdtgrp = filp->private_data;
- WARN_ON(!rdtgrp);
- if (!rdtgrp) {
- mutex_unlock(&rdtgroup_mutex);
- return -ENODEV;
- }
-
- plr = rdtgrp->plr;
-
- if (!plr->d) {
- mutex_unlock(&rdtgroup_mutex);
- return -ENODEV;
- }
-
- /*
- * Task is required to run with affinity to the cpus associated
- * with the pseudo-locked region. If this is not the case the task
- * may be scheduled elsewhere and invalidate entries in the
- * pseudo-locked region.
- */
- if (!cpumask_subset(current->cpus_ptr, &plr->d->cpu_mask)) {
- mutex_unlock(&rdtgroup_mutex);
- return -EINVAL;
- }
-
- physical = __pa(plr->kmem) >> PAGE_SHIFT;
- psize = plr->size - off;
-
- if (off > plr->size) {
- mutex_unlock(&rdtgroup_mutex);
- return -ENOSPC;
- }
-
- /*
- * Ensure changes are carried directly to the memory being mapped,
- * do not allow copy-on-write mapping.
- */
- if (!(vma->vm_flags & VM_SHARED)) {
- mutex_unlock(&rdtgroup_mutex);
- return -EINVAL;
- }
-
- if (vsize > psize) {
- mutex_unlock(&rdtgroup_mutex);
- return -ENOSPC;
- }
-
- memset(plr->kmem + off, 0, vsize);
-
- if (remap_pfn_range(vma, vma->vm_start, physical + vma->vm_pgoff,
- vsize, vma->vm_page_prot)) {
- mutex_unlock(&rdtgroup_mutex);
- return -EAGAIN;
- }
- vma->vm_ops = &pseudo_mmap_ops;
- mutex_unlock(&rdtgroup_mutex);
- return 0;
-}
-
-static const struct file_operations pseudo_lock_dev_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .read = NULL,
- .write = NULL,
- .open = pseudo_lock_dev_open,
- .release = pseudo_lock_dev_release,
- .mmap = pseudo_lock_dev_mmap,
-};
-
-int rdt_pseudo_lock_init(void)
-{
- int ret;
-
- ret = register_chrdev(0, "pseudo_lock", &pseudo_lock_dev_fops);
- if (ret < 0)
- return ret;
-
- pseudo_lock_major = ret;
-
- ret = class_register(&pseudo_lock_class);
- if (ret) {
- unregister_chrdev(pseudo_lock_major, "pseudo_lock");
- return ret;
- }
-
- return 0;
-}
-
-void rdt_pseudo_lock_release(void)
-{
- class_unregister(&pseudo_lock_class);
- unregister_chrdev(pseudo_lock_major, "pseudo_lock");
- pseudo_lock_major = 0;
-}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 6de33de5fa9b..061501e9fc98 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -12,23 +12,9 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/cacheinfo.h>
#include <linux/cpu.h>
-#include <linux/debugfs.h>
-#include <linux/fs.h>
-#include <linux/fs_parser.h>
-#include <linux/sysfs.h>
-#include <linux/kernfs.h>
#include <linux/resctrl.h>
-#include <linux/seq_buf.h>
-#include <linux/seq_file.h>
-#include <linux/sched/signal.h>
-#include <linux/sched/task.h>
#include <linux/slab.h>
-#include <linux/task_work.h>
-#include <linux/user_namespace.h>
-
-#include <uapi/linux/magic.h>
#include "internal.h"
@@ -36,4219 +22,239 @@ DEFINE_STATIC_KEY_FALSE(rdt_enable_key);
DEFINE_STATIC_KEY_FALSE(rdt_mon_enable_key);
DEFINE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
-/* Mutex to protect rdtgroup access. */
-DEFINE_MUTEX(rdtgroup_mutex);
-
-static struct kernfs_root *rdt_root;
-struct rdtgroup rdtgroup_default;
-LIST_HEAD(rdt_all_groups);
-
-/* list of entries for the schemata file */
-LIST_HEAD(resctrl_schema_all);
-
-/* The filesystem can only be mounted once. */
-bool resctrl_mounted;
-
-/* Kernel fs node for "info" directory under root */
-static struct kernfs_node *kn_info;
-
-/* Kernel fs node for "mon_groups" directory under root */
-static struct kernfs_node *kn_mongrp;
-
-/* Kernel fs node for "mon_data" directory under root */
-static struct kernfs_node *kn_mondata;
-
/*
- * Used to store the max resource name width and max resource data width
- * to display the schemata in a tabular format
+ * This is safe against resctrl_arch_sched_in() called from __switch_to()
+ * because __switch_to() is executed with interrupts disabled. A local call
+ * from update_closid_rmid() is protected against __switch_to() because
+ * preemption is disabled.
*/
-int max_name_width, max_data_width;
-
-static struct seq_buf last_cmd_status;
-static char last_cmd_status_buf[512];
-
-static int rdtgroup_setup_root(struct rdt_fs_context *ctx);
-static void rdtgroup_destroy_root(void);
-
-struct dentry *debugfs_resctrl;
-
-static bool resctrl_debug;
-
-void rdt_last_cmd_clear(void)
-{
- lockdep_assert_held(&rdtgroup_mutex);
- seq_buf_clear(&last_cmd_status);
-}
-
-void rdt_last_cmd_puts(const char *s)
-{
- lockdep_assert_held(&rdtgroup_mutex);
- seq_buf_puts(&last_cmd_status, s);
-}
-
-void rdt_last_cmd_printf(const char *fmt, ...)
-{
- va_list ap;
-
- va_start(ap, fmt);
- lockdep_assert_held(&rdtgroup_mutex);
- seq_buf_vprintf(&last_cmd_status, fmt, ap);
- va_end(ap);
-}
-
-void rdt_staged_configs_clear(void)
+void resctrl_arch_sync_cpu_closid_rmid(void *info)
{
- enum resctrl_res_level i;
- struct rdt_resource *r;
- struct rdt_domain *dom;
-
- lockdep_assert_held(&rdtgroup_mutex);
-
- for (i = 0; i < RDT_NUM_RESOURCES; i++) {
- r = resctrl_arch_get_resource(i);
- if (!r->alloc_capable)
- continue;
+ struct resctrl_cpu_defaults *r = info;
- list_for_each_entry(dom, &r->domains, list)
- memset(dom->staged_config, 0, sizeof(dom->staged_config));
+ if (r) {
+ this_cpu_write(pqr_state.default_closid, r->closid);
+ this_cpu_write(pqr_state.default_rmid, r->rmid);
}
-}
-static bool resctrl_is_mbm_enabled(void)
-{
- return (resctrl_arch_is_mbm_total_enabled() ||
- resctrl_arch_is_mbm_local_enabled());
+ /*
+ * We cannot unconditionally write the MSR because the current
+ * executing task might have its own closid selected. Just reuse
+ * the context switch code.
+ */
+ resctrl_arch_sched_in(current);
}
-static bool resctrl_is_mbm_event(int e)
-{
- return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
- e <= QOS_L3_MBM_LOCAL_EVENT_ID);
-}
+#define INVALID_CONFIG_INDEX UINT_MAX
-/*
- * Trivial allocator for CLOSIDs. Since h/w only supports a small number,
- * we can keep a bitmap of free CLOSIDs in a single integer.
+/**
+ * mon_event_config_index_get - get the hardware index for the
+ * configurable event
+ * @evtid: event id.
*
- * Using a global CLOSID across all resources has some advantages and
- * some drawbacks:
- * + We can simply set current's closid to assign a task to a resource
- * group.
- * + Context switch code can avoid extra memory references deciding which
- * CLOSID to load into the PQR_ASSOC MSR
- * - We give up some options in configuring resource groups across multi-socket
- * systems.
- * - Our choices on how to configure each resource become progressively more
- * limited as the number of resources grows.
+ * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
+ * 1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
+ * INVALID_CONFIG_INDEX for invalid evtid
*/
-static unsigned long closid_free_map;
-static int closid_free_map_len;
-
-int closids_supported(void)
-{
- return closid_free_map_len;
-}
-
-static void closid_init(void)
+static inline unsigned int mon_event_config_index_get(u32 evtid)
{
- struct resctrl_schema *s;
- u32 rdt_min_closid = 32;
-
- /* Compute rdt_min_closid across all resources */
- list_for_each_entry(s, &resctrl_schema_all, list)
- rdt_min_closid = min(rdt_min_closid, s->num_closid);
-
- closid_free_map = BIT_MASK(rdt_min_closid) - 1;
-
- /* RESCTRL_RESERVED_CLOSID is always reserved for the default group */
- __clear_bit(RESCTRL_RESERVED_CLOSID, &closid_free_map);
- closid_free_map_len = rdt_min_closid;
+ switch (evtid) {
+ case QOS_L3_MBM_TOTAL_EVENT_ID:
+ return 0;
+ case QOS_L3_MBM_LOCAL_EVENT_ID:
+ return 1;
+ default:
+ /* Should never reach here */
+ return INVALID_CONFIG_INDEX;
+ }
}
-static int closid_alloc(void)
+void resctrl_arch_mon_event_config_read(void *info)
{
- int cleanest_closid;
- u32 closid;
-
- lockdep_assert_held(&rdtgroup_mutex);
+ struct resctrl_mon_config_info *mon_info = info;
+ unsigned int index;
+ u64 msrval;
- if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
- resctrl_arch_is_llc_occupancy_enabled()) {
- cleanest_closid = resctrl_find_cleanest_closid();
- if (cleanest_closid < 0)
- return cleanest_closid;
- closid = cleanest_closid;
- } else {
- closid = ffs(closid_free_map);
- if (closid == 0)
- return -ENOSPC;
- closid--;
+ index = mon_event_config_index_get(mon_info->evtid);
+ if (index == INVALID_CONFIG_INDEX) {
+ pr_warn_once("Invalid event id %d\n", mon_info->evtid);
+ return;
}
- __clear_bit(closid, &closid_free_map);
+ rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
- return closid;
+ /* Report only the valid event configuration bits */
+ mon_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
}
-void closid_free(int closid)
+void resctrl_arch_mon_event_config_write(void *info)
{
- lockdep_assert_held(&rdtgroup_mutex);
-
- __set_bit(closid, &closid_free_map);
-}
+ struct resctrl_mon_config_info *mon_info = info;
+ unsigned int index;
-/**
- * closid_allocated - test if provided closid is in use
- * @closid: closid to be tested
- *
- * Return: true if @closid is currently associated with a resource group,
- * false if @closid is free
- */
-bool closid_allocated(unsigned int closid)
-{
- lockdep_assert_held(&rdtgroup_mutex);
+ index = mon_event_config_index_get(mon_info->evtid);
+ if (index == INVALID_CONFIG_INDEX) {
+ pr_warn_once("Invalid event id %d\n", mon_info->evtid);
+ mon_info->err = -EINVAL;
+ return;
+ }
+ wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
- return !test_bit(closid, &closid_free_map);
+ mon_info->err = 0;
}
-/**
- * rdtgroup_mode_by_closid - Return mode of resource group with closid
- * @closid: closid if the resource group
- *
- * Each resource group is associated with a @closid. Here the mode
- * of a resource group can be queried by searching for it using its closid.
- *
- * Return: mode as &enum rdtgrp_mode of resource group with closid @closid
- */
-enum rdtgrp_mode rdtgroup_mode_by_closid(int closid)
+static void l3_qos_cfg_update(void *arg)
{
- struct rdtgroup *rdtgrp;
-
- list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
- if (rdtgrp->closid == closid)
- return rdtgrp->mode;
- }
+ bool *enable = arg;
- return RDT_NUM_MODES;
+ wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL);
}
-static const char * const rdt_mode_str[] = {
- [RDT_MODE_SHAREABLE] = "shareable",
- [RDT_MODE_EXCLUSIVE] = "exclusive",
- [RDT_MODE_PSEUDO_LOCKSETUP] = "pseudo-locksetup",
- [RDT_MODE_PSEUDO_LOCKED] = "pseudo-locked",
-};
-
-/**
- * rdtgroup_mode_str - Return the string representation of mode
- * @mode: the resource group mode as &enum rdtgroup_mode
- *
- * Return: string representation of valid mode, "unknown" otherwise
- */
-static const char *rdtgroup_mode_str(enum rdtgrp_mode mode)
+static void l2_qos_cfg_update(void *arg)
{
- if (mode < RDT_MODE_SHAREABLE || mode >= RDT_NUM_MODES)
- return "unknown";
+ bool *enable = arg;
- return rdt_mode_str[mode];
+ wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL);
}
-/* set uid and gid of rdtgroup dirs and files to that of the creator */
-static int rdtgroup_kn_set_ugid(struct kernfs_node *kn)
+static int set_cache_qos_cfg(int level, bool enable)
{
- struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID,
- .ia_uid = current_fsuid(),
- .ia_gid = current_fsgid(), };
-
- if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) &&
- gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID))
- return 0;
+ void (*update)(void *arg);
+ struct rdt_resource *r_l;
+ cpumask_var_t cpu_mask;
+ struct rdt_domain *d;
+ int cpu;
- return kernfs_setattr(kn, &iattr);
-}
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
-static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft)
-{
- struct kernfs_node *kn;
- int ret;
+ if (level == RDT_RESOURCE_L3)
+ update = l3_qos_cfg_update;
+ else if (level == RDT_RESOURCE_L2)
+ update = l2_qos_cfg_update;
+ else
+ return -EINVAL;
- kn = __kernfs_create_file(parent_kn, rft->name, rft->mode,
- GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
- 0, rft->kf_ops, rft, NULL, NULL);
- if (IS_ERR(kn))
- return PTR_ERR(kn);
+ if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
+ return -ENOMEM;
- ret = rdtgroup_kn_set_ugid(kn);
- if (ret) {
- kernfs_remove(kn);
- return ret;
+ r_l = &rdt_resources_all[level].r_resctrl;
+ list_for_each_entry(d, &r_l->domains, list) {
+ if (r_l->cache.arch_has_per_cpu_cfg)
+ /* Pick all the CPUs in the domain instance */
+ for_each_cpu(cpu, &d->cpu_mask)
+ cpumask_set_cpu(cpu, cpu_mask);
+ else
+ /* Pick one CPU from each domain instance to update MSR */
+ cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
}
- return 0;
-}
+ /* Update QOS_CFG MSR on all the CPUs in cpu_mask */
+ on_each_cpu_mask(cpu_mask, update, &enable, 1);
-static int rdtgroup_seqfile_show(struct seq_file *m, void *arg)
-{
- struct kernfs_open_file *of = m->private;
- struct rftype *rft = of->kn->priv;
+ free_cpumask_var(cpu_mask);
- if (rft->seq_show)
- return rft->seq_show(of, m, arg);
return 0;
}
-static ssize_t rdtgroup_file_write(struct kernfs_open_file *of, char *buf,
- size_t nbytes, loff_t off)
+/* Restore the qos cfg state when a domain comes online */
+void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
{
- struct rftype *rft = of->kn->priv;
-
- if (rft->write)
- return rft->write(of, buf, nbytes, off);
-
- return -EINVAL;
-}
-
-static const struct kernfs_ops rdtgroup_kf_single_ops = {
- .atomic_write_len = PAGE_SIZE,
- .write = rdtgroup_file_write,
- .seq_show = rdtgroup_seqfile_show,
-};
+ struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-static const struct kernfs_ops kf_mondata_ops = {
- .atomic_write_len = PAGE_SIZE,
- .seq_show = rdtgroup_mondata_show,
-};
+ if (!r->cdp_capable)
+ return;
-static bool is_cpu_list(struct kernfs_open_file *of)
-{
- struct rftype *rft = of->kn->priv;
+ if (r->rid == RDT_RESOURCE_L2)
+ l2_qos_cfg_update(&hw_res->cdp_enabled);
- return rft->flags & RFTYPE_FLAGS_CPUS_LIST;
+ if (r->rid == RDT_RESOURCE_L3)
+ l3_qos_cfg_update(&hw_res->cdp_enabled);
}
-static int rdtgroup_cpus_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
+static int cdp_enable(int level)
{
- struct rdtgroup *rdtgrp;
- struct cpumask *mask;
- int ret = 0;
+ struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
+ int ret;
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!r_l->alloc_capable)
+ return -EINVAL;
- if (rdtgrp) {
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
- if (!rdtgrp->plr->d) {
- rdt_last_cmd_clear();
- rdt_last_cmd_puts("Cache domain offline\n");
- ret = -ENODEV;
- } else {
- mask = &rdtgrp->plr->d->cpu_mask;
- seq_printf(s, is_cpu_list(of) ?
- "%*pbl\n" : "%*pb\n",
- cpumask_pr_args(mask));
- }
- } else {
- seq_printf(s, is_cpu_list(of) ? "%*pbl\n" : "%*pb\n",
- cpumask_pr_args(&rdtgrp->cpu_mask));
- }
- } else {
- ret = -ENOENT;
- }
- rdtgroup_kn_unlock(of->kn);
+ ret = set_cache_qos_cfg(level, true);
+ if (!ret)
+ rdt_resources_all[level].cdp_enabled = true;
return ret;
}
-/*
- * This is safe against resctrl_arch_sched_in() called from __switch_to()
- * because __switch_to() is executed with interrupts disabled. A local call
- * from update_closid_rmid() is protected against __switch_to() because
- * preemption is disabled.
- */
-void resctrl_arch_sync_cpu_closid_rmid(void *info)
-{
- struct resctrl_cpu_defaults *r = info;
-
- if (r) {
- this_cpu_write(pqr_state.default_closid, r->closid);
- this_cpu_write(pqr_state.default_rmid, r->rmid);
- }
-
- /*
- * We cannot unconditionally write the MSR because the current
- * executing task might have its own closid selected. Just reuse
- * the context switch code.
- */
- resctrl_arch_sched_in(current);
-}
-
-/*
- * Update the PGR_ASSOC MSR on all cpus in @cpu_mask,
- *
- * Per task closids/rmids must have been set up before calling this function.
- * @r may be NULL.
- */
-static void
-update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
+static void cdp_disable(int level)
{
- struct resctrl_cpu_defaults defaults, *p = NULL;
+ struct rdt_hw_resource *r_hw = &rdt_resources_all[level];
- if (r) {
- defaults.closid = r->closid;
- defaults.rmid = r->mon.rmid;
- p = &defaults;
+ if (r_hw->cdp_enabled) {
+ set_cache_qos_cfg(level, false);
+ r_hw->cdp_enabled = false;
}
-
- on_each_cpu_mask(cpu_mask, resctrl_arch_sync_cpu_closid_rmid, p, 1);
}
-static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
- cpumask_var_t tmpmask)
+int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
{
- struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp;
- struct list_head *head;
+ struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
- /* Check whether cpus belong to parent ctrl group */
- cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);
- if (!cpumask_empty(tmpmask)) {
- rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n");
+ if (!hw_res->r_resctrl.cdp_capable)
return -EINVAL;
- }
- /* Check whether cpus are dropped from this group */
- cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
- if (!cpumask_empty(tmpmask)) {
- /* Give any dropped cpus to parent rdtgroup */
- cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask);
- update_closid_rmid(tmpmask, prgrp);
- }
-
- /*
- * If we added cpus, remove them from previous group that owned them
- * and update per-cpu rmid
- */
- cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
- if (!cpumask_empty(tmpmask)) {
- head = &prgrp->mon.crdtgrp_list;
- list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
- if (crgrp == rdtgrp)
- continue;
- cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask,
- tmpmask);
- }
- update_closid_rmid(tmpmask, rdtgrp);
- }
+ if (enable)
+ return cdp_enable(l);
- /* Done pushing/pulling - update this group with new mask */
- cpumask_copy(&rdtgrp->cpu_mask, newmask);
+ cdp_disable(l);
return 0;
}
-static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m)
+static int reset_all_ctrls(struct rdt_resource *r)
{
- struct rdtgroup *crgrp;
-
- cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m);
- /* update the child mon group masks as well*/
- list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list)
- cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask);
-}
+ struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+ struct rdt_hw_domain *hw_dom;
+ struct msr_param msr_param;
+ cpumask_var_t cpu_mask;
+ struct rdt_domain *d;
+ int i;
-static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
- cpumask_var_t tmpmask, cpumask_var_t tmpmask1)
-{
- struct rdtgroup *r, *crgrp;
- struct list_head *head;
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
- /* Check whether cpus are dropped from this group */
- cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
- if (!cpumask_empty(tmpmask)) {
- /* Can't drop from default group */
- if (rdtgrp == &rdtgroup_default) {
- rdt_last_cmd_puts("Can't drop CPUs from default group\n");
- return -EINVAL;
- }
+ if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
+ return -ENOMEM;
- /* Give any dropped cpus to rdtgroup_default */
- cpumask_or(&rdtgroup_default.cpu_mask,
- &rdtgroup_default.cpu_mask, tmpmask);
- update_closid_rmid(tmpmask, &rdtgroup_default);
- }
+ msr_param.res = r;
+ msr_param.low = 0;
+ msr_param.high = hw_res->num_closid;
/*
- * If we added cpus, remove them from previous group and
- * the prev group's child groups that owned them
- * and update per-cpu closid/rmid.
+ * Disable resource control for this resource by setting all
+ * CBMs in all domains to the maximum mask value. Pick one CPU
+ * from each domain to update the MSRs below.
*/
- cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
- if (!cpumask_empty(tmpmask)) {
- list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) {
- if (r == rdtgrp)
- continue;
- cpumask_and(tmpmask1, &r->cpu_mask, tmpmask);
- if (!cpumask_empty(tmpmask1))
- cpumask_rdtgrp_clear(r, tmpmask1);
- }
- update_closid_rmid(tmpmask, rdtgrp);
+ list_for_each_entry(d, &r->domains, list) {
+ hw_dom = resctrl_to_arch_dom(d);
+ cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
+
+ for (i = 0; i < hw_res->num_closid; i++)
+ hw_dom->ctrl_val[i] = r->default_ctrl;
}
- /* Done pushing/pulling - update this group with new mask */
- cpumask_copy(&rdtgrp->cpu_mask, newmask);
+ /* Update CBM on all the CPUs in cpu_mask */
+ on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
- /*
- * Clear child mon group masks since there is a new parent mask
- * now and update the rmid for the cpus the child lost.
- */
- head = &rdtgrp->mon.crdtgrp_list;
- list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
- cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask);
- update_closid_rmid(tmpmask, rdtgrp);
- cpumask_clear(&crgrp->cpu_mask);
- }
+ free_cpumask_var(cpu_mask);
return 0;
}
-static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off)
+void resctrl_arch_reset_resources(void)
{
- cpumask_var_t tmpmask, newmask, tmpmask1;
- struct rdtgroup *rdtgrp;
- int ret;
+ struct rdt_resource *r;
- if (!buf)
- return -EINVAL;
-
- if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
- return -ENOMEM;
- if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) {
- free_cpumask_var(tmpmask);
- return -ENOMEM;
- }
- if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) {
- free_cpumask_var(tmpmask);
- free_cpumask_var(newmask);
- return -ENOMEM;
- }
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- ret = -ENOENT;
- goto unlock;
- }
-
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
- rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- ret = -EINVAL;
- rdt_last_cmd_puts("Pseudo-locking in progress\n");
- goto unlock;
- }
-
- if (is_cpu_list(of))
- ret = cpulist_parse(buf, newmask);
- else
- ret = cpumask_parse(buf, newmask);
-
- if (ret) {
- rdt_last_cmd_puts("Bad CPU list/mask\n");
- goto unlock;
- }
-
- /* check that user didn't specify any offline cpus */
- cpumask_andnot(tmpmask, newmask, cpu_online_mask);
- if (!cpumask_empty(tmpmask)) {
- ret = -EINVAL;
- rdt_last_cmd_puts("Can only assign online CPUs\n");
- goto unlock;
- }
-
- if (rdtgrp->type == RDTCTRL_GROUP)
- ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1);
- else if (rdtgrp->type == RDTMON_GROUP)
- ret = cpus_mon_write(rdtgrp, newmask, tmpmask);
- else
- ret = -EINVAL;
-
-unlock:
- rdtgroup_kn_unlock(of->kn);
- free_cpumask_var(tmpmask);
- free_cpumask_var(newmask);
- free_cpumask_var(tmpmask1);
-
- return ret ?: nbytes;
-}
-
-/**
- * rdtgroup_remove - the helper to remove resource group safely
- * @rdtgrp: resource group to remove
- *
- * On resource group creation via a mkdir, an extra kernfs_node reference is
- * taken to ensure that the rdtgroup structure remains accessible for the
- * rdtgroup_kn_unlock() calls where it is removed.
- *
- * Drop the extra reference here, then free the rdtgroup structure.
- *
- * Return: void
- */
-static void rdtgroup_remove(struct rdtgroup *rdtgrp)
-{
- kernfs_put(rdtgrp->kn);
- kfree(rdtgrp);
-}
-
-static void _update_task_closid_rmid(void *task)
-{
- /*
- * If the task is still current on this CPU, update PQR_ASSOC MSR.
- * Otherwise, the MSR is updated when the task is scheduled in.
- */
- if (task == current)
- resctrl_arch_sched_in(task);
-}
-
-static void update_task_closid_rmid(struct task_struct *t)
-{
- if (IS_ENABLED(CONFIG_SMP) && task_curr(t))
- smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1);
- else
- _update_task_closid_rmid(t);
-}
-
-static bool task_in_rdtgroup(struct task_struct *tsk, struct rdtgroup *rdtgrp)
-{
- u32 closid, rmid = rdtgrp->mon.rmid;
-
- if (rdtgrp->type == RDTCTRL_GROUP)
- closid = rdtgrp->closid;
- else if (rdtgrp->type == RDTMON_GROUP)
- closid = rdtgrp->mon.parent->closid;
- else
- return false;
-
- return resctrl_arch_match_closid(tsk, closid) &&
- resctrl_arch_match_rmid(tsk, closid, rmid);
-}
-
-static int __rdtgroup_move_task(struct task_struct *tsk,
- struct rdtgroup *rdtgrp)
-{
- /* If the task is already in rdtgrp, no need to move the task. */
- if (task_in_rdtgroup(tsk, rdtgrp))
- return 0;
-
- /*
- * Set the task's closid/rmid before the PQR_ASSOC MSR can be
- * updated by them.
- *
- * For ctrl_mon groups, move both closid and rmid.
- * For monitor groups, can move the tasks only from
- * their parent CTRL group.
- */
- if (rdtgrp->type == RDTMON_GROUP &&
- !resctrl_arch_match_closid(tsk, rdtgrp->mon.parent->closid)) {
- rdt_last_cmd_puts("Can't move task to different control group\n");
- return -EINVAL;
- }
-
- if (rdtgrp->type == RDTMON_GROUP)
- resctrl_arch_set_closid_rmid(tsk, rdtgrp->mon.parent->closid,
- rdtgrp->mon.rmid);
- else
- resctrl_arch_set_closid_rmid(tsk, rdtgrp->closid,
- rdtgrp->mon.rmid);
-
- /*
- * Ensure the task's closid and rmid are written before determining if
- * the task is current that will decide if it will be interrupted.
- * This pairs with the full barrier between the rq->curr update and
- * resctrl_arch_sched_in() during context switch.
- */
- smp_mb();
-
- /*
- * By now, the task's closid and rmid are set. If the task is current
- * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource
- * group go into effect. If the task is not current, the MSR will be
- * updated when the task is scheduled in.
- */
- update_task_closid_rmid(tsk);
-
- return 0;
-}
-
-static bool is_closid_match(struct task_struct *t, struct rdtgroup *r)
-{
- return (resctrl_arch_alloc_capable() && (r->type == RDTCTRL_GROUP) &&
- resctrl_arch_match_closid(t, r->closid));
-}
-
-static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r)
-{
- return (resctrl_arch_mon_capable() && (r->type == RDTMON_GROUP) &&
- resctrl_arch_match_rmid(t, r->mon.parent->closid,
- r->mon.rmid));
-}
-
-/**
- * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group
- * @r: Resource group
- *
- * Return: 1 if tasks have been assigned to @r, 0 otherwise
- */
-int rdtgroup_tasks_assigned(struct rdtgroup *r)
-{
- struct task_struct *p, *t;
- int ret = 0;
-
- lockdep_assert_held(&rdtgroup_mutex);
-
- rcu_read_lock();
- for_each_process_thread(p, t) {
- if (is_closid_match(t, r) || is_rmid_match(t, r)) {
- ret = 1;
- break;
- }
- }
- rcu_read_unlock();
-
- return ret;
-}
-
-static int rdtgroup_task_write_permission(struct task_struct *task,
- struct kernfs_open_file *of)
-{
- const struct cred *tcred = get_task_cred(task);
- const struct cred *cred = current_cred();
- int ret = 0;
-
- /*
- * Even if we're attaching all tasks in the thread group, we only
- * need to check permissions on one of them.
- */
- if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) &&
- !uid_eq(cred->euid, tcred->uid) &&
- !uid_eq(cred->euid, tcred->suid)) {
- rdt_last_cmd_printf("No permission to move task %d\n", task->pid);
- ret = -EPERM;
- }
-
- put_cred(tcred);
- return ret;
-}
-
-static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp,
- struct kernfs_open_file *of)
-{
- struct task_struct *tsk;
- int ret;
-
- rcu_read_lock();
- if (pid) {
- tsk = find_task_by_vpid(pid);
- if (!tsk) {
- rcu_read_unlock();
- rdt_last_cmd_printf("No task %d\n", pid);
- return -ESRCH;
- }
- } else {
- tsk = current;
- }
-
- get_task_struct(tsk);
- rcu_read_unlock();
-
- ret = rdtgroup_task_write_permission(tsk, of);
- if (!ret)
- ret = __rdtgroup_move_task(tsk, rdtgrp);
-
- put_task_struct(tsk);
- return ret;
-}
-
-static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off)
-{
- struct rdtgroup *rdtgrp;
- char *pid_str;
- int ret = 0;
- pid_t pid;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- rdtgroup_kn_unlock(of->kn);
- return -ENOENT;
- }
- rdt_last_cmd_clear();
-
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
- rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- ret = -EINVAL;
- rdt_last_cmd_puts("Pseudo-locking in progress\n");
- goto unlock;
- }
-
- while (buf && buf[0] != '\0' && buf[0] != '\n') {
- pid_str = strim(strsep(&buf, ","));
-
- if (kstrtoint(pid_str, 0, &pid)) {
- rdt_last_cmd_printf("Task list parsing error pid %s\n", pid_str);
- ret = -EINVAL;
- break;
- }
-
- if (pid < 0) {
- rdt_last_cmd_printf("Invalid pid %d\n", pid);
- ret = -EINVAL;
- break;
- }
-
- ret = rdtgroup_move_task(pid, rdtgrp, of);
- if (ret) {
- rdt_last_cmd_printf("Error while processing task %d\n", pid);
- break;
- }
- }
-
-unlock:
- rdtgroup_kn_unlock(of->kn);
-
- return ret ?: nbytes;
-}
-
-static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s)
-{
- struct task_struct *p, *t;
- pid_t pid;
-
- rcu_read_lock();
- for_each_process_thread(p, t) {
- if (is_closid_match(t, r) || is_rmid_match(t, r)) {
- pid = task_pid_vnr(t);
- if (pid)
- seq_printf(s, "%d\n", pid);
- }
- }
- rcu_read_unlock();
-}
-
-static int rdtgroup_tasks_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
-{
- struct rdtgroup *rdtgrp;
- int ret = 0;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (rdtgrp)
- show_rdt_tasks(rdtgrp, s);
- else
- ret = -ENOENT;
- rdtgroup_kn_unlock(of->kn);
-
- return ret;
-}
-
-static int rdtgroup_closid_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
-{
- struct rdtgroup *rdtgrp;
- int ret = 0;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (rdtgrp)
- seq_printf(s, "%u\n", rdtgrp->closid);
- else
- ret = -ENOENT;
- rdtgroup_kn_unlock(of->kn);
-
- return ret;
-}
-
-static int rdtgroup_rmid_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
-{
- struct rdtgroup *rdtgrp;
- int ret = 0;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (rdtgrp)
- seq_printf(s, "%u\n", rdtgrp->mon.rmid);
- else
- ret = -ENOENT;
- rdtgroup_kn_unlock(of->kn);
-
- return ret;
-}
-
-#ifdef CONFIG_PROC_CPU_RESCTRL
-
-/*
- * A task can only be part of one resctrl control group and of one monitor
- * group which is associated to that control group.
- *
- * 1) res:
- * mon:
- *
- * resctrl is not available.
- *
- * 2) res:/
- * mon:
- *
- * Task is part of the root resctrl control group, and it is not associated
- * to any monitor group.
- *
- * 3) res:/
- * mon:mon0
- *
- * Task is part of the root resctrl control group and monitor group mon0.
- *
- * 4) res:group0
- * mon:
- *
- * Task is part of resctrl control group group0, and it is not associated
- * to any monitor group.
- *
- * 5) res:group0
- * mon:mon1
- *
- * Task is part of resctrl control group group0 and monitor group mon1.
- */
-int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns,
- struct pid *pid, struct task_struct *tsk)
-{
- struct rdtgroup *rdtg;
- int ret = 0;
-
- mutex_lock(&rdtgroup_mutex);
-
- /* Return empty if resctrl has not been mounted. */
- if (!resctrl_mounted) {
- seq_puts(s, "res:\nmon:\n");
- goto unlock;
- }
-
- list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
- struct rdtgroup *crg;
-
- /*
- * Task information is only relevant for shareable
- * and exclusive groups.
- */
- if (rdtg->mode != RDT_MODE_SHAREABLE &&
- rdtg->mode != RDT_MODE_EXCLUSIVE)
- continue;
-
- if (!resctrl_arch_match_closid(tsk, rdtg->closid))
- continue;
-
- seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "",
- rdtg->kn->name);
- seq_puts(s, "mon:");
- list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
- mon.crdtgrp_list) {
- if (!resctrl_arch_match_rmid(tsk, crg->mon.parent->closid,
- crg->mon.rmid))
- continue;
- seq_printf(s, "%s", crg->kn->name);
- break;
- }
- seq_putc(s, '\n');
- goto unlock;
- }
- /*
- * The above search should succeed. Otherwise return
- * with an error.
- */
- ret = -ENOENT;
-unlock:
- mutex_unlock(&rdtgroup_mutex);
-
- return ret;
-}
-#endif
-
-static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- int len;
-
- mutex_lock(&rdtgroup_mutex);
- len = seq_buf_used(&last_cmd_status);
- if (len)
- seq_printf(seq, "%.*s", len, last_cmd_status_buf);
- else
- seq_puts(seq, "ok\n");
- mutex_unlock(&rdtgroup_mutex);
- return 0;
-}
-
-static int rdt_num_closids_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
-
- seq_printf(seq, "%u\n", s->num_closid);
- return 0;
-}
-
-static int rdt_default_ctrl_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- struct rdt_resource *r = s->res;
-
- seq_printf(seq, "%x\n", r->default_ctrl);
- return 0;
-}
-
-static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- struct rdt_resource *r = s->res;
-
- seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
- return 0;
-}
-
-static int rdt_shareable_bits_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- struct rdt_resource *r = s->res;
-
- seq_printf(seq, "%x\n", r->cache.shareable_bits);
- return 0;
-}
-
-/*
- * rdt_bit_usage_show - Display current usage of resources
- *
- * A domain is a shared resource that can now be allocated differently. Here
- * we display the current regions of the domain as an annotated bitmask.
- * For each domain of this resource its allocation bitmask
- * is annotated as below to indicate the current usage of the corresponding bit:
- * 0 - currently unused
- * X - currently available for sharing and used by software and hardware
- * H - currently used by hardware only but available for software use
- * S - currently used and shareable by software only
- * E - currently used exclusively by one resource group
- * P - currently pseudo-locked by one resource group
- */
-static int rdt_bit_usage_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- /*
- * Use unsigned long even though only 32 bits are used to ensure
- * test_bit() is used safely.
- */
- unsigned long sw_shareable = 0, hw_shareable = 0;
- unsigned long exclusive = 0, pseudo_locked = 0;
- struct rdt_resource *r = s->res;
- struct rdt_domain *dom;
- int i, hwb, swb, excl, psl;
- enum rdtgrp_mode mode;
- bool sep = false;
- u32 ctrl_val;
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
- hw_shareable = r->cache.shareable_bits;
- list_for_each_entry(dom, &r->domains, list) {
- if (sep)
- seq_putc(seq, ';');
- sw_shareable = 0;
- exclusive = 0;
- seq_printf(seq, "%d=", dom->id);
- for (i = 0; i < closids_supported(); i++) {
- if (!closid_allocated(i))
- continue;
- ctrl_val = resctrl_arch_get_config(r, dom, i,
- s->conf_type);
- mode = rdtgroup_mode_by_closid(i);
- switch (mode) {
- case RDT_MODE_SHAREABLE:
- sw_shareable |= ctrl_val;
- break;
- case RDT_MODE_EXCLUSIVE:
- exclusive |= ctrl_val;
- break;
- case RDT_MODE_PSEUDO_LOCKSETUP:
- /*
- * RDT_MODE_PSEUDO_LOCKSETUP is possible
- * here but not included since the CBM
- * associated with this CLOSID in this mode
- * is not initialized and no task or cpu can be
- * assigned this CLOSID.
- */
- break;
- case RDT_MODE_PSEUDO_LOCKED:
- case RDT_NUM_MODES:
- WARN(1,
- "invalid mode for closid %d\n", i);
- break;
- }
- }
- for (i = r->cache.cbm_len - 1; i >= 0; i--) {
- pseudo_locked = dom->plr ? dom->plr->cbm : 0;
- hwb = test_bit(i, &hw_shareable);
- swb = test_bit(i, &sw_shareable);
- excl = test_bit(i, &exclusive);
- psl = test_bit(i, &pseudo_locked);
- if (hwb && swb)
- seq_putc(seq, 'X');
- else if (hwb && !swb)
- seq_putc(seq, 'H');
- else if (!hwb && swb)
- seq_putc(seq, 'S');
- else if (excl)
- seq_putc(seq, 'E');
- else if (psl)
- seq_putc(seq, 'P');
- else /* Unused bits remain */
- seq_putc(seq, '0');
- }
- sep = true;
- }
- seq_putc(seq, '\n');
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
- return 0;
-}
-
-static int rdt_min_bw_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- struct rdt_resource *r = s->res;
-
- seq_printf(seq, "%u\n", r->membw.min_bw);
- return 0;
-}
-
-static int rdt_num_rmids_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct rdt_resource *r = of->kn->parent->priv;
-
- seq_printf(seq, "%d\n", r->num_rmid);
-
- return 0;
-}
-
-static int rdt_mon_features_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct rdt_resource *r = of->kn->parent->priv;
- struct mon_evt *mevt;
-
- list_for_each_entry(mevt, &r->evt_list, list) {
- seq_printf(seq, "%s\n", mevt->name);
- if (mevt->configurable)
- seq_printf(seq, "%s_config\n", mevt->name);
- }
-
- return 0;
-}
-
-static int rdt_bw_gran_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- struct rdt_resource *r = s->res;
-
- seq_printf(seq, "%u\n", r->membw.bw_gran);
- return 0;
-}
-
-static int rdt_delay_linear_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- struct rdt_resource *r = s->res;
-
- seq_printf(seq, "%u\n", r->membw.delay_linear);
- return 0;
-}
-
-static int max_threshold_occ_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- seq_printf(seq, "%u\n", resctrl_rmid_realloc_threshold);
-
- return 0;
-}
-
-static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- struct rdt_resource *r = s->res;
-
- if (r->membw.throttle_mode == THREAD_THROTTLE_PER_THREAD)
- seq_puts(seq, "per-thread\n");
- else
- seq_puts(seq, "max\n");
-
- return 0;
-}
-
-static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off)
-{
- unsigned int bytes;
- int ret;
-
- ret = kstrtouint(buf, 0, &bytes);
- if (ret)
- return ret;
-
- if (bytes > resctrl_rmid_realloc_limit)
- return -EINVAL;
-
- resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(bytes);
-
- return nbytes;
-}
-
-/*
- * rdtgroup_mode_show - Display mode of this resource group
- */
-static int rdtgroup_mode_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
-{
- struct rdtgroup *rdtgrp;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- rdtgroup_kn_unlock(of->kn);
- return -ENOENT;
- }
-
- seq_printf(s, "%s\n", rdtgroup_mode_str(rdtgrp->mode));
-
- rdtgroup_kn_unlock(of->kn);
- return 0;
-}
-
-static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
-{
- switch (my_type) {
- case CDP_CODE:
- return CDP_DATA;
- case CDP_DATA:
- return CDP_CODE;
- default:
- case CDP_NONE:
- return CDP_NONE;
- }
-}
-
-static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct resctrl_schema *s = of->kn->parent->priv;
- struct rdt_resource *r = s->res;
-
- seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);
-
- return 0;
-}
-
-/**
- * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other
- * @r: Resource to which domain instance @d belongs.
- * @d: The domain instance for which @closid is being tested.
- * @cbm: Capacity bitmask being tested.
- * @closid: Intended closid for @cbm.
- * @type: CDP type of @r.
- * @exclusive: Only check if overlaps with exclusive resource groups
- *
- * Checks if provided @cbm intended to be used for @closid on domain
- * @d overlaps with any other closids or other hardware usage associated
- * with this domain. If @exclusive is true then only overlaps with
- * resource groups in exclusive mode will be considered. If @exclusive
- * is false then overlaps with any resource group or hardware entities
- * will be considered.
- *
- * @cbm is unsigned long, even if only 32 bits are used, to make the
- * bitmap functions work correctly.
- *
- * Return: false if CBM does not overlap, true if it does.
- */
-static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
- unsigned long cbm, int closid,
- enum resctrl_conf_type type, bool exclusive)
-{
- enum rdtgrp_mode mode;
- unsigned long ctrl_b;
- int i;
-
- /* Check for any overlap with regions used by hardware directly */
- if (!exclusive) {
- ctrl_b = r->cache.shareable_bits;
- if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len))
- return true;
- }
-
- /* Check for overlap with other resource groups */
- for (i = 0; i < closids_supported(); i++) {
- ctrl_b = resctrl_arch_get_config(r, d, i, type);
- mode = rdtgroup_mode_by_closid(i);
- if (closid_allocated(i) && i != closid &&
- mode != RDT_MODE_PSEUDO_LOCKSETUP) {
- if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) {
- if (exclusive) {
- if (mode == RDT_MODE_EXCLUSIVE)
- return true;
- continue;
- }
- return true;
- }
- }
- }
-
- return false;
-}
-
-/**
- * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware
- * @s: Schema for the resource to which domain instance @d belongs.
- * @d: The domain instance for which @closid is being tested.
- * @cbm: Capacity bitmask being tested.
- * @closid: Intended closid for @cbm.
- * @exclusive: Only check if overlaps with exclusive resource groups
- *
- * Resources that can be allocated using a CBM can use the CBM to control
- * the overlap of these allocations. rdtgroup_cmb_overlaps() is the test
- * for overlap. Overlap test is not limited to the specific resource for
- * which the CBM is intended though - when dealing with CDP resources that
- * share the underlying hardware the overlap check should be performed on
- * the CDP resource sharing the hardware also.
- *
- * Refer to description of __rdtgroup_cbm_overlaps() for the details of the
- * overlap test.
- *
- * Return: true if CBM overlap detected, false if there is no overlap
- */
-bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
- unsigned long cbm, int closid, bool exclusive)
-{
- enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
- struct rdt_resource *r = s->res;
-
- if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
- exclusive))
- return true;
-
- if (!resctrl_arch_get_cdp_enabled(r->rid))
- return false;
- return __rdtgroup_cbm_overlaps(r, d, cbm, closid, peer_type, exclusive);
-}
-
-/**
- * rdtgroup_mode_test_exclusive - Test if this resource group can be exclusive
- * @rdtgrp: Resource group identified through its closid.
- *
- * An exclusive resource group implies that there should be no sharing of
- * its allocated resources. At the time this group is considered to be
- * exclusive this test can determine if its current schemata supports this
- * setting by testing for overlap with all other resource groups.
- *
- * Return: true if resource group can be exclusive, false if there is overlap
- * with allocations of other resource groups and thus this resource group
- * cannot be exclusive.
- */
-static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
-{
- int closid = rdtgrp->closid;
- struct resctrl_schema *s;
- struct rdt_resource *r;
- bool has_cache = false;
- struct rdt_domain *d;
- u32 ctrl;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- list_for_each_entry(s, &resctrl_schema_all, list) {
- r = s->res;
- if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
- continue;
- has_cache = true;
- list_for_each_entry(d, &r->domains, list) {
- ctrl = resctrl_arch_get_config(r, d, closid,
- s->conf_type);
- if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
- rdt_last_cmd_puts("Schemata overlaps\n");
- return false;
- }
- }
- }
-
- if (!has_cache) {
- rdt_last_cmd_puts("Cannot be exclusive without CAT/CDP\n");
- return false;
- }
-
- return true;
-}
-
-/*
- * rdtgroup_mode_write - Modify the resource group's mode
- */
-static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off)
-{
- struct rdtgroup *rdtgrp;
- enum rdtgrp_mode mode;
- int ret = 0;
-
- /* Valid input requires a trailing newline */
- if (nbytes == 0 || buf[nbytes - 1] != '\n')
- return -EINVAL;
- buf[nbytes - 1] = '\0';
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- rdtgroup_kn_unlock(of->kn);
- return -ENOENT;
- }
-
- rdt_last_cmd_clear();
-
- mode = rdtgrp->mode;
-
- if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) ||
- (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) ||
- (!strcmp(buf, "pseudo-locksetup") &&
- mode == RDT_MODE_PSEUDO_LOCKSETUP) ||
- (!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED))
- goto out;
-
- if (mode == RDT_MODE_PSEUDO_LOCKED) {
- rdt_last_cmd_puts("Cannot change pseudo-locked group\n");
- ret = -EINVAL;
- goto out;
- }
-
- if (!strcmp(buf, "shareable")) {
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- ret = rdtgroup_locksetup_exit(rdtgrp);
- if (ret)
- goto out;
- }
- rdtgrp->mode = RDT_MODE_SHAREABLE;
- } else if (!strcmp(buf, "exclusive")) {
- if (!rdtgroup_mode_test_exclusive(rdtgrp)) {
- ret = -EINVAL;
- goto out;
- }
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- ret = rdtgroup_locksetup_exit(rdtgrp);
- if (ret)
- goto out;
- }
- rdtgrp->mode = RDT_MODE_EXCLUSIVE;
- } else if (IS_ENABLED(CONFIG_RESCTRL_FS_PSEUDO_LOCK) &&
- !strcmp(buf, "pseudo-locksetup")) {
- ret = rdtgroup_locksetup_enter(rdtgrp);
- if (ret)
- goto out;
- rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP;
- } else {
- rdt_last_cmd_puts("Unknown or unsupported mode\n");
- ret = -EINVAL;
- }
-
-out:
- rdtgroup_kn_unlock(of->kn);
- return ret ?: nbytes;
-}
-
-/**
- * rdtgroup_cbm_to_size - Translate CBM to size in bytes
- * @r: RDT resource to which @d belongs.
- * @d: RDT domain instance.
- * @cbm: bitmask for which the size should be computed.
- *
- * The bitmask provided associated with the RDT domain instance @d will be
- * translated into how many bytes it represents. The size in bytes is
- * computed by first dividing the total cache size by the CBM length to
- * determine how many bytes each bit in the bitmask represents. The result
- * is multiplied with the number of bits set in the bitmask.
- *
- * @cbm is unsigned long, even if only 32 bits are used to make the
- * bitmap functions work correctly.
- */
-unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
- struct rdt_domain *d, unsigned long cbm)
-{
- struct cpu_cacheinfo *ci;
- unsigned int size = 0;
- int num_b, i;
-
- num_b = bitmap_weight(&cbm, r->cache.cbm_len);
- ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
- for (i = 0; i < ci->num_leaves; i++) {
- if (ci->info_list[i].level == r->cache_level) {
- size = ci->info_list[i].size / r->cache.cbm_len * num_b;
- break;
- }
- }
-
- return size;
-}
-
-/*
- * rdtgroup_size_show - Display size in bytes of allocated regions
- *
- * The "size" file mirrors the layout of the "schemata" file, printing the
- * size in bytes of each region instead of the capacity bitmask.
- */
-static int rdtgroup_size_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
-{
- struct resctrl_schema *schema;
- enum resctrl_conf_type type;
- struct rdtgroup *rdtgrp;
- struct rdt_resource *r;
- struct rdt_domain *d;
- unsigned int size;
- int ret = 0;
- u32 closid;
- bool sep;
- u32 ctrl;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- rdtgroup_kn_unlock(of->kn);
- return -ENOENT;
- }
-
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
- if (!rdtgrp->plr->d) {
- rdt_last_cmd_clear();
- rdt_last_cmd_puts("Cache domain offline\n");
- ret = -ENODEV;
- } else {
- seq_printf(s, "%*s:", max_name_width,
- rdtgrp->plr->s->name);
- size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
- rdtgrp->plr->d,
- rdtgrp->plr->cbm);
- seq_printf(s, "%d=%u\n", rdtgrp->plr->d->id, size);
- }
- goto out;
- }
-
- closid = rdtgrp->closid;
-
- list_for_each_entry(schema, &resctrl_schema_all, list) {
- r = schema->res;
- type = schema->conf_type;
- sep = false;
- seq_printf(s, "%*s:", max_name_width, schema->name);
- list_for_each_entry(d, &r->domains, list) {
- if (sep)
- seq_putc(s, ';');
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- size = 0;
- } else {
- if (is_mba_sc(r))
- ctrl = d->mbps_val[closid];
- else
- ctrl = resctrl_arch_get_config(r, d,
- closid,
- type);
- if (r->rid == RDT_RESOURCE_MBA ||
- r->rid == RDT_RESOURCE_SMBA)
- size = ctrl;
- else
- size = rdtgroup_cbm_to_size(r, d, ctrl);
- }
- seq_printf(s, "%d=%u", d->id, size);
- sep = true;
- }
- seq_putc(s, '\n');
- }
-
-out:
- rdtgroup_kn_unlock(of->kn);
-
- return ret;
-}
-
-#define INVALID_CONFIG_INDEX UINT_MAX
-
-/**
- * mon_event_config_index_get - get the hardware index for the
- * configurable event
- * @evtid: event id.
- *
- * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
- * 1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
- * INVALID_CONFIG_INDEX for invalid evtid
- */
-static inline unsigned int mon_event_config_index_get(u32 evtid)
-{
- switch (evtid) {
- case QOS_L3_MBM_TOTAL_EVENT_ID:
- return 0;
- case QOS_L3_MBM_LOCAL_EVENT_ID:
- return 1;
- default:
- /* Should never reach here */
- return INVALID_CONFIG_INDEX;
- }
-}
-
-void resctrl_arch_mon_event_config_read(void *info)
-{
- struct resctrl_mon_config_info *mon_info = info;
- unsigned int index;
- u64 msrval;
-
- index = mon_event_config_index_get(mon_info->evtid);
- if (index == INVALID_CONFIG_INDEX) {
- pr_warn_once("Invalid event id %d\n", mon_info->evtid);
- return;
- }
- rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
-
- /* Report only the valid event configuration bits */
- mon_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
-}
-
-static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
-{
- smp_call_function_any(&mon_info->d->cpu_mask,
- resctrl_arch_mon_event_config_read, mon_info, 1);
-}
-
-static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
-{
- struct resctrl_mon_config_info mon_info = {0};
- struct rdt_domain *dom;
- bool sep = false;
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
-
- list_for_each_entry(dom, &r->domains, list) {
- if (sep)
- seq_puts(s, ";");
-
- memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
- mon_info.r = r;
- mon_info.d = dom;
- mon_info.evtid = evtid;
- mondata_config_read(&mon_info);
-
- seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config);
- sep = true;
- }
- seq_puts(s, "\n");
-
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
-
- return 0;
-}
-
-static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct rdt_resource *r = of->kn->parent->priv;
-
- mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);
-
- return 0;
-}
-
-static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
- struct seq_file *seq, void *v)
-{
- struct rdt_resource *r = of->kn->parent->priv;
-
- mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
-
- return 0;
-}
-
-void resctrl_arch_mon_event_config_write(void *info)
-{
- struct resctrl_mon_config_info *mon_info = info;
- unsigned int index;
-
- index = mon_event_config_index_get(mon_info->evtid);
- if (index == INVALID_CONFIG_INDEX) {
- pr_warn_once("Invalid event id %d\n", mon_info->evtid);
- mon_info->err = -EINVAL;
- return;
- }
- wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
-
- mon_info->err = 0;
-}
-
-static int mbm_config_write_domain(struct rdt_resource *r,
- struct rdt_domain *d, u32 evtid, u32 val)
-{
- struct resctrl_mon_config_info mon_info = {0};
-
- /*
- * Read the current config value first. If both are the same then
- * no need to write it again.
- */
- mon_info.r = r;
- mon_info.d = d;
- mon_info.evtid = evtid;
- mondata_config_read(&mon_info);
- if (mon_info.mon_config == val)
- return 0;
-
- mon_info.mon_config = val;
-
- /*
- * Update MSR_IA32_EVT_CFG_BASE MSR on one of the CPUs in the
- * domain. The MSRs offset from MSR MSR_IA32_EVT_CFG_BASE
- * are scoped at the domain level. Writing any of these MSRs
- * on one CPU is observed by all the CPUs in the domain.
- */
- smp_call_function_any(&d->cpu_mask, resctrl_arch_mon_event_config_write,
- &mon_info, 1);
- if (mon_info.err) {
- rdt_last_cmd_puts("Invalid event configuration\n");
- return mon_info.err;
- }
-
- /*
- * When an Event Configuration is changed, the bandwidth counters
- * for all RMIDs and Events will be cleared by the hardware. The
- * hardware also sets MSR_IA32_QM_CTR.Unavailable (bit 62) for
- * every RMID on the next read to any event for every RMID.
- * Subsequent reads will have MSR_IA32_QM_CTR.Unavailable (bit 62)
- * cleared while it is tracked by the hardware. Clear the
- * mbm_local and mbm_total counts for all the RMIDs.
- */
- resctrl_arch_reset_rmid_all(r, d);
-
- return 0;
-}
-
-static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
-{
- char *dom_str = NULL, *id_str;
- unsigned long dom_id, val;
- struct rdt_domain *d;
- int err;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
-next:
- if (!tok || tok[0] == '\0')
- return 0;
-
- /* Start processing the strings for each domain */
- dom_str = strim(strsep(&tok, ";"));
- id_str = strsep(&dom_str, "=");
-
- if (!id_str || kstrtoul(id_str, 10, &dom_id)) {
- rdt_last_cmd_puts("Missing '=' or non-numeric domain id\n");
- return -EINVAL;
- }
-
- if (!dom_str || kstrtoul(dom_str, 16, &val)) {
- rdt_last_cmd_puts("Non-numeric event configuration value\n");
- return -EINVAL;
- }
-
- /* Value from user cannot be more than the supported set of events */
- if ((val & r->mbm_cfg_mask) != val) {
- rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
- r->mbm_cfg_mask);
- return -EINVAL;
- }
-
- list_for_each_entry(d, &r->domains, list) {
- if (d->id == dom_id) {
- err = mbm_config_write_domain(r, d, evtid, val);
- if (err)
- return err;
- goto next;
- }
- }
-
- return -EINVAL;
-}
-
-static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes,
- loff_t off)
-{
- struct rdt_resource *r = of->kn->parent->priv;
- int ret;
-
- /* Valid input requires a trailing newline */
- if (nbytes == 0 || buf[nbytes - 1] != '\n')
- return -EINVAL;
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
-
- rdt_last_cmd_clear();
-
- buf[nbytes - 1] = '\0';
-
- ret = mon_config_write(r, buf, QOS_L3_MBM_TOTAL_EVENT_ID);
-
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
-
- return ret ?: nbytes;
-}
-
-static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes,
- loff_t off)
-{
- struct rdt_resource *r = of->kn->parent->priv;
- int ret;
-
- /* Valid input requires a trailing newline */
- if (nbytes == 0 || buf[nbytes - 1] != '\n')
- return -EINVAL;
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
-
- rdt_last_cmd_clear();
-
- buf[nbytes - 1] = '\0';
-
- ret = mon_config_write(r, buf, QOS_L3_MBM_LOCAL_EVENT_ID);
-
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
-
- return ret ?: nbytes;
-}
-
-/* rdtgroup information files for one cache resource. */
-static struct rftype res_common_files[] = {
- {
- .name = "last_cmd_status",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_last_cmd_status_show,
- .fflags = RFTYPE_TOP_INFO,
- },
- {
- .name = "num_closids",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_num_closids_show,
- .fflags = RFTYPE_CTRL_INFO,
- },
- {
- .name = "mon_features",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_mon_features_show,
- .fflags = RFTYPE_MON_INFO,
- },
- {
- .name = "num_rmids",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_num_rmids_show,
- .fflags = RFTYPE_MON_INFO,
- },
- {
- .name = "cbm_mask",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_default_ctrl_show,
- .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
- },
- {
- .name = "min_cbm_bits",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_min_cbm_bits_show,
- .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
- },
- {
- .name = "shareable_bits",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_shareable_bits_show,
- .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
- },
- {
- .name = "bit_usage",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_bit_usage_show,
- .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
- },
- {
- .name = "min_bandwidth",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_min_bw_show,
- .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
- },
- {
- .name = "bandwidth_gran",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_bw_gran_show,
- .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
- },
- {
- .name = "delay_linear",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_delay_linear_show,
- .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
- },
- /*
- * Platform specific which (if any) capabilities are provided by
- * thread_throttle_mode. Defer "fflags" initialization to platform
- * discovery.
- */
- {
- .name = "thread_throttle_mode",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_thread_throttle_mode_show,
- },
- {
- .name = "max_threshold_occupancy",
- .mode = 0644,
- .kf_ops = &rdtgroup_kf_single_ops,
- .write = max_threshold_occ_write,
- .seq_show = max_threshold_occ_show,
- .fflags = RFTYPE_MON_INFO | RFTYPE_RES_CACHE,
- },
- {
- .name = "mbm_total_bytes_config",
- .mode = 0644,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = mbm_total_bytes_config_show,
- .write = mbm_total_bytes_config_write,
- },
- {
- .name = "mbm_local_bytes_config",
- .mode = 0644,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = mbm_local_bytes_config_show,
- .write = mbm_local_bytes_config_write,
- },
- {
- .name = "cpus",
- .mode = 0644,
- .kf_ops = &rdtgroup_kf_single_ops,
- .write = rdtgroup_cpus_write,
- .seq_show = rdtgroup_cpus_show,
- .fflags = RFTYPE_BASE,
- },
- {
- .name = "cpus_list",
- .mode = 0644,
- .kf_ops = &rdtgroup_kf_single_ops,
- .write = rdtgroup_cpus_write,
- .seq_show = rdtgroup_cpus_show,
- .flags = RFTYPE_FLAGS_CPUS_LIST,
- .fflags = RFTYPE_BASE,
- },
- {
- .name = "tasks",
- .mode = 0644,
- .kf_ops = &rdtgroup_kf_single_ops,
- .write = rdtgroup_tasks_write,
- .seq_show = rdtgroup_tasks_show,
- .fflags = RFTYPE_BASE,
- },
- {
- .name = "mon_hw_id",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdtgroup_rmid_show,
- .fflags = RFTYPE_MON_BASE | RFTYPE_DEBUG,
- },
- {
- .name = "schemata",
- .mode = 0644,
- .kf_ops = &rdtgroup_kf_single_ops,
- .write = rdtgroup_schemata_write,
- .seq_show = rdtgroup_schemata_show,
- .fflags = RFTYPE_CTRL_BASE,
- },
- {
- .name = "mode",
- .mode = 0644,
- .kf_ops = &rdtgroup_kf_single_ops,
- .write = rdtgroup_mode_write,
- .seq_show = rdtgroup_mode_show,
- .fflags = RFTYPE_CTRL_BASE,
- },
- {
- .name = "size",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdtgroup_size_show,
- .fflags = RFTYPE_CTRL_BASE,
- },
- {
- .name = "sparse_masks",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdt_has_sparse_bitmasks_show,
- .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
- },
- {
- .name = "ctrl_hw_id",
- .mode = 0444,
- .kf_ops = &rdtgroup_kf_single_ops,
- .seq_show = rdtgroup_closid_show,
- .fflags = RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
- },
-};
-
-static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags)
-{
- struct rftype *rfts, *rft;
- int ret, len;
-
- rfts = res_common_files;
- len = ARRAY_SIZE(res_common_files);
-
- lockdep_assert_held(&rdtgroup_mutex);
-
- if (resctrl_debug)
- fflags |= RFTYPE_DEBUG;
-
- for (rft = rfts; rft < rfts + len; rft++) {
- if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) {
- ret = rdtgroup_add_file(kn, rft);
- if (ret)
- goto error;
- }
- }
-
- return 0;
-error:
- pr_warn("Failed to add %s, err=%d\n", rft->name, ret);
- while (--rft >= rfts) {
- if ((fflags & rft->fflags) == rft->fflags)
- kernfs_remove_by_name(kn, rft->name);
- }
- return ret;
-}
-
-static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
-{
- struct rftype *rfts, *rft;
- int len;
-
- rfts = res_common_files;
- len = ARRAY_SIZE(res_common_files);
-
- for (rft = rfts; rft < rfts + len; rft++) {
- if (!strcmp(rft->name, name))
- return rft;
- }
-
- return NULL;
-}
-
-static void thread_throttle_mode_init(void)
-{
- struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
- struct rftype *rft;
-
- if (!r->alloc_capable ||
- r->membw.throttle_mode == THREAD_THROTTLE_UNDEFINED)
- return;
-
- rft = rdtgroup_get_rftype_by_name("thread_throttle_mode");
- if (!rft)
- return;
-
- rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB;
-}
-
-void mbm_config_rftype_init(const char *config)
-{
- struct rftype *rft;
-
- rft = rdtgroup_get_rftype_by_name(config);
- if (rft)
- rft->fflags = RFTYPE_MON_INFO | RFTYPE_RES_CACHE;
-}
-
-/**
- * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file
- * @r: The resource group with which the file is associated.
- * @name: Name of the file
- *
- * The permissions of named resctrl file, directory, or link are modified
- * to not allow read, write, or execute by any user.
- *
- * WARNING: This function is intended to communicate to the user that the
- * resctrl file has been locked down - that it is not relevant to the
- * particular state the system finds itself in. It should not be relied
- * on to protect from user access because after the file's permissions
- * are restricted the user can still change the permissions using chmod
- * from the command line.
- *
- * Return: 0 on success, <0 on failure.
- */
-int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name)
-{
- struct iattr iattr = {.ia_valid = ATTR_MODE,};
- struct kernfs_node *kn;
- int ret = 0;
-
- kn = kernfs_find_and_get_ns(r->kn, name, NULL);
- if (!kn)
- return -ENOENT;
-
- switch (kernfs_type(kn)) {
- case KERNFS_DIR:
- iattr.ia_mode = S_IFDIR;
- break;
- case KERNFS_FILE:
- iattr.ia_mode = S_IFREG;
- break;
- case KERNFS_LINK:
- iattr.ia_mode = S_IFLNK;
- break;
- }
-
- ret = kernfs_setattr(kn, &iattr);
- kernfs_put(kn);
- return ret;
-}
-
-/**
- * rdtgroup_kn_mode_restore - Restore user access to named resctrl file
- * @r: The resource group with which the file is associated.
- * @name: Name of the file
- * @mask: Mask of permissions that should be restored
- *
- * Restore the permissions of the named file. If @name is a directory the
- * permissions of its parent will be used.
- *
- * Return: 0 on success, <0 on failure.
- */
-int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
- umode_t mask)
-{
- struct iattr iattr = {.ia_valid = ATTR_MODE,};
- struct kernfs_node *kn, *parent;
- struct rftype *rfts, *rft;
- int ret, len;
-
- rfts = res_common_files;
- len = ARRAY_SIZE(res_common_files);
-
- for (rft = rfts; rft < rfts + len; rft++) {
- if (!strcmp(rft->name, name))
- iattr.ia_mode = rft->mode & mask;
- }
-
- kn = kernfs_find_and_get_ns(r->kn, name, NULL);
- if (!kn)
- return -ENOENT;
-
- switch (kernfs_type(kn)) {
- case KERNFS_DIR:
- parent = kernfs_get_parent(kn);
- if (parent) {
- iattr.ia_mode |= parent->mode;
- kernfs_put(parent);
- }
- iattr.ia_mode |= S_IFDIR;
- break;
- case KERNFS_FILE:
- iattr.ia_mode |= S_IFREG;
- break;
- case KERNFS_LINK:
- iattr.ia_mode |= S_IFLNK;
- break;
- }
-
- ret = kernfs_setattr(kn, &iattr);
- kernfs_put(kn);
- return ret;
-}
-
-static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
- unsigned long fflags)
-{
- struct kernfs_node *kn_subdir;
- int ret;
-
- kn_subdir = kernfs_create_dir(kn_info, name,
- kn_info->mode, priv);
- if (IS_ERR(kn_subdir))
- return PTR_ERR(kn_subdir);
-
- ret = rdtgroup_kn_set_ugid(kn_subdir);
- if (ret)
- return ret;
-
- ret = rdtgroup_add_files(kn_subdir, fflags);
- if (!ret)
- kernfs_activate(kn_subdir);
-
- return ret;
-}
-
-static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
-{
- enum resctrl_res_level i;
- struct resctrl_schema *s;
- struct rdt_resource *r;
- unsigned long fflags;
- char name[32];
- int ret;
-
- /* create the directory */
- kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL);
- if (IS_ERR(kn_info))
- return PTR_ERR(kn_info);
-
- ret = rdtgroup_add_files(kn_info, RFTYPE_TOP_INFO);
- if (ret)
- goto out_destroy;
-
- /* loop over enabled controls, these are all alloc_capable */
- list_for_each_entry(s, &resctrl_schema_all, list) {
- r = s->res;
- fflags = r->fflags | RFTYPE_CTRL_INFO;
- ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
- if (ret)
- goto out_destroy;
- }
-
- for (i = 0; i < RDT_NUM_RESOURCES; i++) {
- r = resctrl_arch_get_resource(i);
- if (!r->mon_capable)
- continue;
-
- fflags = r->fflags | RFTYPE_MON_INFO;
- sprintf(name, "%s_MON", r->name);
- ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
- if (ret)
- goto out_destroy;
- }
-
- ret = rdtgroup_kn_set_ugid(kn_info);
- if (ret)
- goto out_destroy;
-
- kernfs_activate(kn_info);
-
- return 0;
-
-out_destroy:
- kernfs_remove(kn_info);
- return ret;
-}
-
-static int
-mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp,
- char *name, struct kernfs_node **dest_kn)
-{
- struct kernfs_node *kn;
- int ret;
-
- /* create the directory */
- kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
- if (IS_ERR(kn))
- return PTR_ERR(kn);
-
- if (dest_kn)
- *dest_kn = kn;
-
- ret = rdtgroup_kn_set_ugid(kn);
- if (ret)
- goto out_destroy;
-
- kernfs_activate(kn);
-
- return 0;
-
-out_destroy:
- kernfs_remove(kn);
- return ret;
-}
-
-static void l3_qos_cfg_update(void *arg)
-{
- bool *enable = arg;
-
- wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL);
-}
-
-static void l2_qos_cfg_update(void *arg)
-{
- bool *enable = arg;
-
- wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL);
-}
-
-static inline bool is_mba_linear(void)
-{
- return resctrl_arch_get_resource(RDT_RESOURCE_MBA)->membw.delay_linear;
-}
-
-static int set_cache_qos_cfg(int level, bool enable)
-{
- void (*update)(void *arg);
- struct rdt_resource *r_l;
- cpumask_var_t cpu_mask;
- struct rdt_domain *d;
- int cpu;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- if (level == RDT_RESOURCE_L3)
- update = l3_qos_cfg_update;
- else if (level == RDT_RESOURCE_L2)
- update = l2_qos_cfg_update;
- else
- return -EINVAL;
-
- if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
- return -ENOMEM;
-
- r_l = &rdt_resources_all[level].r_resctrl;
- list_for_each_entry(d, &r_l->domains, list) {
- if (r_l->cache.arch_has_per_cpu_cfg)
- /* Pick all the CPUs in the domain instance */
- for_each_cpu(cpu, &d->cpu_mask)
- cpumask_set_cpu(cpu, cpu_mask);
- else
- /* Pick one CPU from each domain instance to update MSR */
- cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
- }
-
- /* Update QOS_CFG MSR on all the CPUs in cpu_mask */
- on_each_cpu_mask(cpu_mask, update, &enable, 1);
-
- free_cpumask_var(cpu_mask);
-
- return 0;
-}
-
-/* Restore the qos cfg state when a domain comes online */
-void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
-{
- struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-
- if (!r->cdp_capable)
- return;
-
- if (r->rid == RDT_RESOURCE_L2)
- l2_qos_cfg_update(&hw_res->cdp_enabled);
-
- if (r->rid == RDT_RESOURCE_L3)
- l3_qos_cfg_update(&hw_res->cdp_enabled);
-}
-
-static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d)
-{
- u32 num_closid = resctrl_arch_get_num_closid(r);
- int cpu = cpumask_any(&d->cpu_mask);
- int i;
-
- d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val),
- GFP_KERNEL, cpu_to_node(cpu));
- if (!d->mbps_val)
- return -ENOMEM;
-
- for (i = 0; i < num_closid; i++)
- d->mbps_val[i] = MBA_MAX_MBPS;
-
- return 0;
-}
-
-static void mba_sc_domain_destroy(struct rdt_resource *r,
- struct rdt_domain *d)
-{
- kfree(d->mbps_val);
- d->mbps_val = NULL;
-}
-
-/*
- * MBA software controller is supported only if
- * MBM is supported and MBA is in linear scale.
- */
-static bool supports_mba_mbps(void)
-{
- struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
- return (resctrl_arch_is_mbm_local_enabled() &&
- r->alloc_capable && is_mba_linear());
-}
-
-/*
- * Enable or disable the MBA software controller
- * which helps user specify bandwidth in MBps.
- */
-static int set_mba_sc(bool mba_sc)
-{
- struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
- u32 num_closid = resctrl_arch_get_num_closid(r);
- struct rdt_domain *d;
- int i;
-
- if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
- return -EINVAL;
-
- r->membw.mba_sc = mba_sc;
-
- list_for_each_entry(d, &r->domains, list) {
- for (i = 0; i < num_closid; i++)
- d->mbps_val[i] = MBA_MAX_MBPS;
- }
-
- return 0;
-}
-
-static int cdp_enable(int level)
-{
- struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
- int ret;
-
- if (!r_l->alloc_capable)
- return -EINVAL;
-
- ret = set_cache_qos_cfg(level, true);
- if (!ret)
- rdt_resources_all[level].cdp_enabled = true;
-
- return ret;
-}
-
-static void cdp_disable(int level)
-{
- struct rdt_hw_resource *r_hw = &rdt_resources_all[level];
-
- if (r_hw->cdp_enabled) {
- set_cache_qos_cfg(level, false);
- r_hw->cdp_enabled = false;
- }
-}
-
-int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
-{
- struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
-
- if (!hw_res->r_resctrl.cdp_capable)
- return -EINVAL;
-
- if (enable)
- return cdp_enable(l);
-
- cdp_disable(l);
-
- return 0;
-}
-
-/*
- * We don't allow rdtgroup directories to be created anywhere
- * except the root directory. Thus when looking for the rdtgroup
- * structure for a kernfs node we are either looking at a directory,
- * in which case the rdtgroup structure is pointed at by the "priv"
- * field, otherwise we have a file, and need only look to the parent
- * to find the rdtgroup.
- */
-static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn)
-{
- if (kernfs_type(kn) == KERNFS_DIR) {
- /*
- * All the resource directories use "kn->priv"
- * to point to the "struct rdtgroup" for the
- * resource. "info" and its subdirectories don't
- * have rdtgroup structures, so return NULL here.
- */
- if (kn == kn_info || kn->parent == kn_info)
- return NULL;
- else
- return kn->priv;
- } else {
- return kn->parent->priv;
- }
-}
-
-static void rdtgroup_kn_get(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
-{
- atomic_inc(&rdtgrp->waitcount);
- kernfs_break_active_protection(kn);
-}
-
-static void rdtgroup_kn_put(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
-{
- if (atomic_dec_and_test(&rdtgrp->waitcount) &&
- (rdtgrp->flags & RDT_DELETED)) {
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
- rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
- rdtgroup_pseudo_lock_remove(rdtgrp);
- kernfs_unbreak_active_protection(kn);
- rdtgroup_remove(rdtgrp);
- } else {
- kernfs_unbreak_active_protection(kn);
- }
-}
-
-struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn)
-{
- struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
-
- if (!rdtgrp)
- return NULL;
-
- rdtgroup_kn_get(rdtgrp, kn);
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
-
- /* Was this group deleted while we waited? */
- if (rdtgrp->flags & RDT_DELETED)
- return NULL;
-
- return rdtgrp;
-}
-
-void rdtgroup_kn_unlock(struct kernfs_node *kn)
-{
- struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
-
- if (!rdtgrp)
- return;
-
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
-
- rdtgroup_kn_put(rdtgrp, kn);
-}
-
-static int mkdir_mondata_all(struct kernfs_node *parent_kn,
- struct rdtgroup *prgrp,
- struct kernfs_node **mon_data_kn);
-
-static void rdt_disable_ctx(void)
-{
- resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
- resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
- set_mba_sc(false);
-
- resctrl_debug = false;
-}
-
-static int rdt_enable_ctx(struct rdt_fs_context *ctx)
-{
- int ret = 0;
-
- if (ctx->enable_cdpl2) {
- ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true);
- if (ret)
- goto out_done;
- }
-
- if (ctx->enable_cdpl3) {
- ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true);
- if (ret)
- goto out_cdpl2;
- }
-
- if (ctx->enable_mba_mbps) {
- ret = set_mba_sc(true);
- if (ret)
- goto out_cdpl3;
- }
-
- if (ctx->enable_debug)
- resctrl_debug = true;
-
- return 0;
-
-out_cdpl3:
- resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
-out_cdpl2:
- resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
-out_done:
- return ret;
-}
-
-static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type)
-{
- struct resctrl_schema *s;
- const char *suffix = "";
- int ret, cl;
-
- s = kzalloc(sizeof(*s), GFP_KERNEL);
- if (!s)
- return -ENOMEM;
-
- s->res = r;
- s->num_closid = resctrl_arch_get_num_closid(r);
- if (resctrl_arch_get_cdp_enabled(r->rid))
- s->num_closid /= 2;
-
- s->conf_type = type;
- switch (type) {
- case CDP_CODE:
- suffix = "CODE";
- break;
- case CDP_DATA:
- suffix = "DATA";
- break;
- case CDP_NONE:
- suffix = "";
- break;
- }
-
- ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix);
- if (ret >= sizeof(s->name)) {
- kfree(s);
- return -EINVAL;
- }
-
- cl = strlen(s->name);
-
- /*
- * If CDP is supported by this resource, but not enabled,
- * include the suffix. This ensures the tabular format of the
- * schemata file does not change between mounts of the filesystem.
- */
- if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
- cl += 4;
-
- if (cl > max_name_width)
- max_name_width = cl;
-
- /*
- * Choose a width for the resource data based on the resource that has
- * widest name and CBM.
- */
- max_data_width = max(max_data_width, r->data_width);
-
- INIT_LIST_HEAD(&s->list);
- list_add(&s->list, &resctrl_schema_all);
-
- return 0;
-}
-
-static int schemata_list_create(void)
-{
- enum resctrl_res_level i;
- struct rdt_resource *r;
- int ret = 0;
-
- for (i = 0; i < RDT_NUM_RESOURCES; i++) {
- r = resctrl_arch_get_resource(i);
- if (!r->alloc_capable)
- continue;
-
- if (resctrl_arch_get_cdp_enabled(r->rid)) {
- ret = schemata_list_add(r, CDP_CODE);
- if (ret)
- break;
-
- ret = schemata_list_add(r, CDP_DATA);
- } else {
- ret = schemata_list_add(r, CDP_NONE);
- }
-
- if (ret)
- break;
- }
-
- return ret;
-}
-
-static void schemata_list_destroy(void)
-{
- struct resctrl_schema *s, *tmp;
-
- list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) {
- list_del(&s->list);
- kfree(s);
- }
-}
-
-static int rdt_get_tree(struct fs_context *fc)
-{
- struct rdt_fs_context *ctx = rdt_fc2context(fc);
- unsigned long flags = RFTYPE_CTRL_BASE;
- struct rdt_domain *dom;
- struct rdt_resource *r;
- int ret;
-
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
- /*
- * resctrl file system can only be mounted once.
- */
- if (resctrl_mounted) {
- ret = -EBUSY;
- goto out;
- }
-
- ret = rdtgroup_setup_root(ctx);
- if (ret)
- goto out;
-
- ret = rdt_enable_ctx(ctx);
- if (ret)
- goto out_root;
-
- ret = schemata_list_create();
- if (ret) {
- schemata_list_destroy();
- goto out_ctx;
- }
-
- closid_init();
-
- if (resctrl_arch_mon_capable())
- flags |= RFTYPE_MON;
-
- ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
- if (ret)
- goto out_schemata_free;
-
- kernfs_activate(rdtgroup_default.kn);
-
- ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
- if (ret < 0)
- goto out_schemata_free;
-
- if (resctrl_arch_mon_capable()) {
- ret = mongroup_create_dir(rdtgroup_default.kn,
- &rdtgroup_default, "mon_groups",
- &kn_mongrp);
- if (ret < 0)
- goto out_info;
-
- ret = mkdir_mondata_all(rdtgroup_default.kn,
- &rdtgroup_default, &kn_mondata);
- if (ret < 0)
- goto out_mongrp;
- rdtgroup_default.mon.mon_data_kn = kn_mondata;
- }
-
- ret = rdt_pseudo_lock_init();
- if (ret)
- goto out_mondata;
-
- ret = kernfs_get_tree(fc);
- if (ret < 0)
- goto out_psl;
-
- if (resctrl_arch_alloc_capable())
- resctrl_arch_enable_alloc();
- if (resctrl_arch_mon_capable())
- resctrl_arch_enable_mon();
-
- if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
- resctrl_mounted = true;
-
- if (resctrl_is_mbm_enabled()) {
- r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
- list_for_each_entry(dom, &r->domains, list)
- mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
- RESCTRL_PICK_ANY_CPU);
- }
-
- goto out;
-
-out_psl:
- rdt_pseudo_lock_release();
-out_mondata:
- if (resctrl_arch_mon_capable())
- kernfs_remove(kn_mondata);
-out_mongrp:
- if (resctrl_arch_mon_capable())
- kernfs_remove(kn_mongrp);
-out_info:
- kernfs_remove(kn_info);
-out_schemata_free:
- schemata_list_destroy();
-out_ctx:
- rdt_disable_ctx();
-out_root:
- rdtgroup_destroy_root();
-out:
- rdt_last_cmd_clear();
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
- return ret;
-}
-
-enum rdt_param {
- Opt_cdp,
- Opt_cdpl2,
- Opt_mba_mbps,
- Opt_debug,
- nr__rdt_params
-};
-
-static const struct fs_parameter_spec rdt_fs_parameters[] = {
- fsparam_flag("cdp", Opt_cdp),
- fsparam_flag("cdpl2", Opt_cdpl2),
- fsparam_flag("mba_MBps", Opt_mba_mbps),
- fsparam_flag("debug", Opt_debug),
- {}
-};
-
-static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
-{
- struct rdt_fs_context *ctx = rdt_fc2context(fc);
- struct fs_parse_result result;
- int opt;
-
- opt = fs_parse(fc, rdt_fs_parameters, param, &result);
- if (opt < 0)
- return opt;
-
- switch (opt) {
- case Opt_cdp:
- ctx->enable_cdpl3 = true;
- return 0;
- case Opt_cdpl2:
- ctx->enable_cdpl2 = true;
- return 0;
- case Opt_mba_mbps:
- if (!supports_mba_mbps())
- return -EINVAL;
- ctx->enable_mba_mbps = true;
- return 0;
- case Opt_debug:
- ctx->enable_debug = true;
- return 0;
- }
-
- return -EINVAL;
-}
-
-static void rdt_fs_context_free(struct fs_context *fc)
-{
- struct rdt_fs_context *ctx = rdt_fc2context(fc);
-
- kernfs_free_fs_context(fc);
- kfree(ctx);
-}
-
-static const struct fs_context_operations rdt_fs_context_ops = {
- .free = rdt_fs_context_free,
- .parse_param = rdt_parse_param,
- .get_tree = rdt_get_tree,
-};
-
-static int rdt_init_fs_context(struct fs_context *fc)
-{
- struct rdt_fs_context *ctx;
-
- ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
- if (!ctx)
- return -ENOMEM;
-
- ctx->kfc.magic = RDTGROUP_SUPER_MAGIC;
- fc->fs_private = &ctx->kfc;
- fc->ops = &rdt_fs_context_ops;
- put_user_ns(fc->user_ns);
- fc->user_ns = get_user_ns(&init_user_ns);
- fc->global = true;
- return 0;
-}
-
-static int reset_all_ctrls(struct rdt_resource *r)
-{
- struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
- struct rdt_hw_domain *hw_dom;
- struct msr_param msr_param;
- cpumask_var_t cpu_mask;
- struct rdt_domain *d;
- int i;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
- return -ENOMEM;
-
- msr_param.res = r;
- msr_param.low = 0;
- msr_param.high = hw_res->num_closid;
-
- /*
- * Disable resource control for this resource by setting all
- * CBMs in all domains to the maximum mask value. Pick one CPU
- * from each domain to update the MSRs below.
- */
- list_for_each_entry(d, &r->domains, list) {
- hw_dom = resctrl_to_arch_dom(d);
- cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
-
- for (i = 0; i < hw_res->num_closid; i++)
- hw_dom->ctrl_val[i] = r->default_ctrl;
- }
-
- /* Update CBM on all the CPUs in cpu_mask */
- on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
-
- free_cpumask_var(cpu_mask);
-
- return 0;
-}
-
-void resctrl_arch_reset_resources(void)
-{
- struct rdt_resource *r;
-
- for_each_alloc_capable_rdt_resource(r)
- reset_all_ctrls(r);
-}
-
-/*
- * Move tasks from one to the other group. If @from is NULL, then all tasks
- * in the systems are moved unconditionally (used for teardown).
- *
- * If @mask is not NULL the cpus on which moved tasks are running are set
- * in that mask so the update smp function call is restricted to affected
- * cpus.
- */
-static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to,
- struct cpumask *mask)
-{
- struct task_struct *p, *t;
-
- read_lock(&tasklist_lock);
- for_each_process_thread(p, t) {
- if (!from || is_closid_match(t, from) ||
- is_rmid_match(t, from)) {
- resctrl_arch_set_closid_rmid(t, to->closid,
- to->mon.rmid);
-
- /*
- * Order the closid/rmid stores above before the loads
- * in task_curr(). This pairs with the full barrier
- * between the rq->curr update and
- * resctrl_arch_sched_in() during context switch.
- */
- smp_mb();
-
- /*
- * If the task is on a CPU, set the CPU in the mask.
- * The detection is inaccurate as tasks might move or
- * schedule before the smp function call takes place.
- * In such a case the function call is pointless, but
- * there is no other side effect.
- */
- if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t))
- cpumask_set_cpu(task_cpu(t), mask);
- }
- }
- read_unlock(&tasklist_lock);
-}
-
-static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp)
-{
- struct rdtgroup *sentry, *stmp;
- struct list_head *head;
-
- head = &rdtgrp->mon.crdtgrp_list;
- list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) {
- free_rmid(sentry->closid, sentry->mon.rmid);
- list_del(&sentry->mon.crdtgrp_list);
-
- if (atomic_read(&sentry->waitcount) != 0)
- sentry->flags = RDT_DELETED;
- else
- rdtgroup_remove(sentry);
- }
-}
-
-/*
- * Forcibly remove all of subdirectories under root.
- */
-static void rmdir_all_sub(void)
-{
- struct rdtgroup *rdtgrp, *tmp;
-
- /* Move all tasks to the default resource group */
- rdt_move_group_tasks(NULL, &rdtgroup_default, NULL);
-
- list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) {
- /* Free any child rmids */
- free_all_child_rdtgrp(rdtgrp);
-
- /* Remove each rdtgroup other than root */
- if (rdtgrp == &rdtgroup_default)
- continue;
-
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
- rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
- rdtgroup_pseudo_lock_remove(rdtgrp);
-
- /*
- * Give any CPUs back to the default group. We cannot copy
- * cpu_online_mask because a CPU might have executed the
- * offline callback already, but is still marked online.
- */
- cpumask_or(&rdtgroup_default.cpu_mask,
- &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
-
- free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
- kernfs_remove(rdtgrp->kn);
- list_del(&rdtgrp->rdtgroup_list);
-
- if (atomic_read(&rdtgrp->waitcount) != 0)
- rdtgrp->flags = RDT_DELETED;
- else
- rdtgroup_remove(rdtgrp);
- }
- /* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */
- update_closid_rmid(cpu_online_mask, &rdtgroup_default);
-
- kernfs_remove(kn_info);
- kernfs_remove(kn_mongrp);
- kernfs_remove(kn_mondata);
-}
-
-static void rdt_kill_sb(struct super_block *sb)
-{
- cpus_read_lock();
- mutex_lock(&rdtgroup_mutex);
-
- rdt_disable_ctx();
-
- /* Put everything back to default values. */
- resctrl_arch_reset_resources();
-
- rmdir_all_sub();
- rdt_pseudo_lock_release();
- rdtgroup_default.mode = RDT_MODE_SHAREABLE;
- schemata_list_destroy();
- rdtgroup_destroy_root();
- if (resctrl_arch_alloc_capable())
- resctrl_arch_disable_alloc();
- if (resctrl_arch_mon_capable())
- resctrl_arch_disable_mon();
- resctrl_mounted = false;
- kernfs_kill_sb(sb);
- mutex_unlock(&rdtgroup_mutex);
- cpus_read_unlock();
-}
-
-static struct file_system_type rdt_fs_type = {
- .name = "resctrl",
- .init_fs_context = rdt_init_fs_context,
- .parameters = rdt_fs_parameters,
- .kill_sb = rdt_kill_sb,
-};
-
-static int mon_addfile(struct kernfs_node *parent_kn, const char *name,
- void *priv)
-{
- struct kernfs_node *kn;
- int ret = 0;
-
- kn = __kernfs_create_file(parent_kn, name, 0444,
- GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0,
- &kf_mondata_ops, priv, NULL, NULL);
- if (IS_ERR(kn))
- return PTR_ERR(kn);
-
- ret = rdtgroup_kn_set_ugid(kn);
- if (ret) {
- kernfs_remove(kn);
- return ret;
- }
-
- return ret;
-}
-
-/*
- * Remove all subdirectories of mon_data of ctrl_mon groups
- * and monitor groups with given domain id.
- */
-static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
- unsigned int dom_id)
-{
- struct rdtgroup *prgrp, *crgrp;
- char name[32];
-
- list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
- sprintf(name, "mon_%s_%02d", r->name, dom_id);
- kernfs_remove_by_name(prgrp->mon.mon_data_kn, name);
-
- list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
- kernfs_remove_by_name(crgrp->mon.mon_data_kn, name);
- }
-}
-
-static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
- struct rdt_domain *d,
- struct rdt_resource *r, struct rdtgroup *prgrp)
-{
- union mon_data_bits priv;
- struct kernfs_node *kn;
- struct mon_evt *mevt;
- struct rmid_read rr;
- char name[32];
- int ret;
-
- sprintf(name, "mon_%s_%02d", r->name, d->id);
- /* create the directory */
- kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
- if (IS_ERR(kn))
- return PTR_ERR(kn);
-
- ret = rdtgroup_kn_set_ugid(kn);
- if (ret)
- goto out_destroy;
-
- if (WARN_ON(list_empty(&r->evt_list))) {
- ret = -EPERM;
- goto out_destroy;
- }
-
- priv.u.rid = r->rid;
- priv.u.domid = d->id;
- list_for_each_entry(mevt, &r->evt_list, list) {
- priv.u.evtid = mevt->evtid;
- ret = mon_addfile(kn, mevt->name, priv.priv);
- if (ret)
- goto out_destroy;
-
- if (resctrl_is_mbm_event(mevt->evtid))
- mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
- }
- kernfs_activate(kn);
- return 0;
-
-out_destroy:
- kernfs_remove(kn);
- return ret;
-}
-
-/*
- * Add all subdirectories of mon_data for "ctrl_mon" groups
- * and "monitor" groups with given domain id.
- */
-static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
- struct rdt_domain *d)
-{
- struct kernfs_node *parent_kn;
- struct rdtgroup *prgrp, *crgrp;
- struct list_head *head;
-
- list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
- parent_kn = prgrp->mon.mon_data_kn;
- mkdir_mondata_subdir(parent_kn, d, r, prgrp);
-
- head = &prgrp->mon.crdtgrp_list;
- list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
- parent_kn = crgrp->mon.mon_data_kn;
- mkdir_mondata_subdir(parent_kn, d, r, crgrp);
- }
- }
-}
-
-static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
- struct rdt_resource *r,
- struct rdtgroup *prgrp)
-{
- struct rdt_domain *dom;
- int ret;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- list_for_each_entry(dom, &r->domains, list) {
- ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-/*
- * This creates a directory mon_data which contains the monitored data.
- *
- * mon_data has one directory for each domain which are named
- * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data
- * with L3 domain looks as below:
- * ./mon_data:
- * mon_L3_00
- * mon_L3_01
- * mon_L3_02
- * ...
- *
- * Each domain directory has one file per event:
- * ./mon_L3_00/:
- * llc_occupancy
- *
- */
-static int mkdir_mondata_all(struct kernfs_node *parent_kn,
- struct rdtgroup *prgrp,
- struct kernfs_node **dest_kn)
-{
- enum resctrl_res_level i;
- struct rdt_resource *r;
- struct kernfs_node *kn;
- int ret;
-
- /*
- * Create the mon_data directory first.
- */
- ret = mongroup_create_dir(parent_kn, prgrp, "mon_data", &kn);
- if (ret)
- return ret;
-
- if (dest_kn)
- *dest_kn = kn;
-
- /*
- * Create the subdirectories for each domain. Note that all events
- * in a domain like L3 are grouped into a resource whose domain is L3
- */
- for (i = 0; i < RDT_NUM_RESOURCES; i++) {
- r = resctrl_arch_get_resource(i);
- if (!r->mon_capable)
- continue;
-
- ret = mkdir_mondata_subdir_alldom(kn, r, prgrp);
- if (ret)
- goto out_destroy;
- }
-
- return 0;
-
-out_destroy:
- kernfs_remove(kn);
- return ret;
-}
-
-/**
- * cbm_ensure_valid - Enforce validity on provided CBM
- * @_val: Candidate CBM
- * @r: RDT resource to which the CBM belongs
- *
- * The provided CBM represents all cache portions available for use. This
- * may be represented by a bitmap that does not consist of contiguous ones
- * and thus be an invalid CBM.
- * Here the provided CBM is forced to be a valid CBM by only considering
- * the first set of contiguous bits as valid and clearing all bits.
- * The intention here is to provide a valid default CBM with which a new
- * resource group is initialized. The user can follow this with a
- * modification to the CBM if the default does not satisfy the
- * requirements.
- */
-static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
-{
- unsigned int cbm_len = r->cache.cbm_len;
- unsigned long first_bit, zero_bit;
- unsigned long val = _val;
-
- if (!val)
- return 0;
-
- first_bit = find_first_bit(&val, cbm_len);
- zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
-
- /* Clear any remaining bits to ensure contiguous region */
- bitmap_clear(&val, zero_bit, cbm_len - zero_bit);
- return (u32)val;
-}
-
-/*
- * Initialize cache resources per RDT domain
- *
- * Set the RDT domain up to start off with all usable allocations. That is,
- * all shareable and unused bits. All-zero CBM is invalid.
- */
-static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
- u32 closid)
-{
- enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
- enum resctrl_conf_type t = s->conf_type;
- struct resctrl_staged_config *cfg;
- struct rdt_resource *r = s->res;
- u32 used_b = 0, unused_b = 0;
- unsigned long tmp_cbm;
- enum rdtgrp_mode mode;
- u32 peer_ctl, ctrl_val;
- int i;
-
- cfg = &d->staged_config[t];
- cfg->have_new_ctrl = false;
- cfg->new_ctrl = r->cache.shareable_bits;
- used_b = r->cache.shareable_bits;
- for (i = 0; i < closids_supported(); i++) {
- if (closid_allocated(i) && i != closid) {
- mode = rdtgroup_mode_by_closid(i);
- if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
- /*
- * ctrl values for locksetup aren't relevant
- * until the schemata is written, and the mode
- * becomes RDT_MODE_PSEUDO_LOCKED.
- */
- continue;
- /*
- * If CDP is active include peer domain's
- * usage to ensure there is no overlap
- * with an exclusive group.
- */
- if (resctrl_arch_get_cdp_enabled(r->rid))
- peer_ctl = resctrl_arch_get_config(r, d, i,
- peer_type);
- else
- peer_ctl = 0;
- ctrl_val = resctrl_arch_get_config(r, d, i,
- s->conf_type);
- used_b |= ctrl_val | peer_ctl;
- if (mode == RDT_MODE_SHAREABLE)
- cfg->new_ctrl |= ctrl_val | peer_ctl;
- }
- }
- if (d->plr && d->plr->cbm > 0)
- used_b |= d->plr->cbm;
- unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1);
- unused_b &= BIT_MASK(r->cache.cbm_len) - 1;
- cfg->new_ctrl |= unused_b;
- /*
- * Force the initial CBM to be valid, user can
- * modify the CBM based on system availability.
- */
- cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r);
- /*
- * Assign the u32 CBM to an unsigned long to ensure that
- * bitmap_weight() does not access out-of-bound memory.
- */
- tmp_cbm = cfg->new_ctrl;
- if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
- rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
- return -ENOSPC;
- }
- cfg->have_new_ctrl = true;
-
- return 0;
-}
-
-/*
- * Initialize cache resources with default values.
- *
- * A new RDT group is being created on an allocation capable (CAT)
- * supporting system. Set this group up to start off with all usable
- * allocations.
- *
- * If there are no more shareable bits available on any domain then
- * the entire allocation will fail.
- */
-static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
-{
- struct rdt_domain *d;
- int ret;
-
- list_for_each_entry(d, &s->res->domains, list) {
- ret = __init_one_rdt_domain(d, s, closid);
- if (ret < 0)
- return ret;
- }
-
- return 0;
-}
-
-/* Initialize MBA resource with default values. */
-static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
-{
- struct resctrl_staged_config *cfg;
- struct rdt_domain *d;
-
- list_for_each_entry(d, &r->domains, list) {
- if (is_mba_sc(r)) {
- d->mbps_val[closid] = MBA_MAX_MBPS;
- continue;
- }
-
- cfg = &d->staged_config[CDP_NONE];
- cfg->new_ctrl = r->default_ctrl;
- cfg->have_new_ctrl = true;
- }
-}
-
-/* Initialize the RDT group's allocations. */
-static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
-{
- struct resctrl_schema *s;
- struct rdt_resource *r;
- int ret = 0;
-
- rdt_staged_configs_clear();
-
- list_for_each_entry(s, &resctrl_schema_all, list) {
- r = s->res;
- if (r->rid == RDT_RESOURCE_MBA ||
- r->rid == RDT_RESOURCE_SMBA) {
- rdtgroup_init_mba(r, rdtgrp->closid);
- if (is_mba_sc(r))
- continue;
- } else {
- ret = rdtgroup_init_cat(s, rdtgrp->closid);
- if (ret < 0)
- goto out;
- }
-
- ret = resctrl_arch_update_domains(r, rdtgrp->closid);
- if (ret < 0) {
- rdt_last_cmd_puts("Failed to initialize allocations\n");
- goto out;
- }
- }
-
- rdtgrp->mode = RDT_MODE_SHAREABLE;
-
-out:
- rdt_staged_configs_clear();
- return ret;
-}
-
-static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)
-{
- int ret;
-
- if (!resctrl_arch_mon_capable())
- return 0;
-
- ret = alloc_rmid(rdtgrp->closid);
- if (ret < 0) {
- rdt_last_cmd_puts("Out of RMIDs\n");
- return ret;
- }
- rdtgrp->mon.rmid = ret;
-
- ret = mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
- if (ret) {
- rdt_last_cmd_puts("kernfs subdir error\n");
- free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
- return ret;
- }
-
- return 0;
-}
-
-static void mkdir_rdt_prepare_rmid_free(struct rdtgroup *rgrp)
-{
- if (resctrl_arch_mon_capable())
- free_rmid(rgrp->closid, rgrp->mon.rmid);
-}
-
-static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
- const char *name, umode_t mode,
- enum rdt_group_type rtype, struct rdtgroup **r)
-{
- struct rdtgroup *prdtgrp, *rdtgrp;
- unsigned long files = 0;
- struct kernfs_node *kn;
- int ret;
-
- prdtgrp = rdtgroup_kn_lock_live(parent_kn);
- if (!prdtgrp) {
- ret = -ENODEV;
- goto out_unlock;
- }
-
- if (rtype == RDTMON_GROUP &&
- (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
- prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) {
- ret = -EINVAL;
- rdt_last_cmd_puts("Pseudo-locking in progress\n");
- goto out_unlock;
- }
-
- /* allocate the rdtgroup. */
- rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL);
- if (!rdtgrp) {
- ret = -ENOSPC;
- rdt_last_cmd_puts("Kernel out of memory\n");
- goto out_unlock;
- }
- *r = rdtgrp;
- rdtgrp->mon.parent = prdtgrp;
- rdtgrp->type = rtype;
- INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list);
-
- /* kernfs creates the directory for rdtgrp */
- kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp);
- if (IS_ERR(kn)) {
- ret = PTR_ERR(kn);
- rdt_last_cmd_puts("kernfs create error\n");
- goto out_free_rgrp;
- }
- rdtgrp->kn = kn;
-
- /*
- * kernfs_remove() will drop the reference count on "kn" which
- * will free it. But we still need it to stick around for the
- * rdtgroup_kn_unlock(kn) call. Take one extra reference here,
- * which will be dropped by kernfs_put() in rdtgroup_remove().
- */
- kernfs_get(kn);
-
- ret = rdtgroup_kn_set_ugid(kn);
- if (ret) {
- rdt_last_cmd_puts("kernfs perm error\n");
- goto out_destroy;
- }
-
- if (rtype == RDTCTRL_GROUP) {
- files = RFTYPE_BASE | RFTYPE_CTRL;
- if (resctrl_arch_mon_capable())
- files |= RFTYPE_MON;
- } else {
- files = RFTYPE_BASE | RFTYPE_MON;
- }
-
- ret = rdtgroup_add_files(kn, files);
- if (ret) {
- rdt_last_cmd_puts("kernfs fill error\n");
- goto out_destroy;
- }
-
- /*
- * The caller unlocks the parent_kn upon success.
- */
- return 0;
-
-out_destroy:
- kernfs_put(rdtgrp->kn);
- kernfs_remove(rdtgrp->kn);
-out_free_rgrp:
- kfree(rdtgrp);
-out_unlock:
- rdtgroup_kn_unlock(parent_kn);
- return ret;
-}
-
-static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp)
-{
- kernfs_remove(rgrp->kn);
- rdtgroup_remove(rgrp);
-}
-
-/*
- * Create a monitor group under "mon_groups" directory of a control
- * and monitor group(ctrl_mon). This is a resource group
- * to monitor a subset of tasks and cpus in its parent ctrl_mon group.
- */
-static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn,
- const char *name, umode_t mode)
-{
- struct rdtgroup *rdtgrp, *prgrp;
- int ret;
-
- ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTMON_GROUP, &rdtgrp);
- if (ret)
- return ret;
-
- prgrp = rdtgrp->mon.parent;
- rdtgrp->closid = prgrp->closid;
-
- ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
- if (ret) {
- mkdir_rdt_prepare_clean(rdtgrp);
- goto out_unlock;
- }
-
- kernfs_activate(rdtgrp->kn);
-
- /*
- * Add the rdtgrp to the list of rdtgrps the parent
- * ctrl_mon group has to track.
- */
- list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list);
-
-out_unlock:
- rdtgroup_kn_unlock(parent_kn);
- return ret;
-}
-
-/*
- * These are rdtgroups created under the root directory. Can be used
- * to allocate and monitor resources.
- */
-static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
- const char *name, umode_t mode)
-{
- struct rdtgroup *rdtgrp;
- struct kernfs_node *kn;
- u32 closid;
- int ret;
-
- ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTCTRL_GROUP, &rdtgrp);
- if (ret)
- return ret;
-
- kn = rdtgrp->kn;
- ret = closid_alloc();
- if (ret < 0) {
- rdt_last_cmd_puts("Out of CLOSIDs\n");
- goto out_common_fail;
- }
- closid = ret;
- ret = 0;
-
- rdtgrp->closid = closid;
-
- ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
- if (ret)
- goto out_closid_free;
-
- kernfs_activate(rdtgrp->kn);
-
- ret = rdtgroup_init_alloc(rdtgrp);
- if (ret < 0)
- goto out_rmid_free;
-
- list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
-
- if (resctrl_arch_mon_capable()) {
- /*
- * Create an empty mon_groups directory to hold the subset
- * of tasks and cpus to monitor.
- */
- ret = mongroup_create_dir(kn, rdtgrp, "mon_groups", NULL);
- if (ret) {
- rdt_last_cmd_puts("kernfs subdir error\n");
- goto out_del_list;
- }
- }
-
- goto out_unlock;
-
-out_del_list:
- list_del(&rdtgrp->rdtgroup_list);
-out_rmid_free:
- mkdir_rdt_prepare_rmid_free(rdtgrp);
-out_closid_free:
- closid_free(closid);
-out_common_fail:
- mkdir_rdt_prepare_clean(rdtgrp);
-out_unlock:
- rdtgroup_kn_unlock(parent_kn);
- return ret;
-}
-
-/*
- * We allow creating mon groups only with in a directory called "mon_groups"
- * which is present in every ctrl_mon group. Check if this is a valid
- * "mon_groups" directory.
- *
- * 1. The directory should be named "mon_groups".
- * 2. The mon group itself should "not" be named "mon_groups".
- * This makes sure "mon_groups" directory always has a ctrl_mon group
- * as parent.
- */
-static bool is_mon_groups(struct kernfs_node *kn, const char *name)
-{
- return (!strcmp(kn->name, "mon_groups") &&
- strcmp(name, "mon_groups"));
-}
-
-static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
- umode_t mode)
-{
- /* Do not accept '\n' to avoid unparsable situation. */
- if (strchr(name, '\n'))
- return -EINVAL;
-
- /*
- * If the parent directory is the root directory and RDT
- * allocation is supported, add a control and monitoring
- * subdirectory
- */
- if (resctrl_arch_alloc_capable() && parent_kn == rdtgroup_default.kn)
- return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode);
-
- /*
- * If RDT monitoring is supported and the parent directory is a valid
- * "mon_groups" directory, add a monitoring subdirectory.
- */
- if (resctrl_arch_mon_capable() && is_mon_groups(parent_kn, name))
- return rdtgroup_mkdir_mon(parent_kn, name, mode);
-
- return -EPERM;
-}
-
-static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
-{
- struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
- u32 closid, rmid;
- int cpu;
-
- /* Give any tasks back to the parent group */
- rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
-
- /*
- * Update per cpu closid/rmid of the moved CPUs first.
- * Note: the closid will not change, but the arch code still needs it.
- */
- closid = prdtgrp->closid;
- rmid = prdtgrp->mon.rmid;
- for_each_cpu(cpu, &rdtgrp->cpu_mask)
- resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
-
- /*
- * Update the MSR on moved CPUs and CPUs which have moved
- * task running on them.
- */
- cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
- update_closid_rmid(tmpmask, NULL);
-
- rdtgrp->flags = RDT_DELETED;
- free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
- /*
- * Remove the rdtgrp from the parent ctrl_mon group's list
- */
- WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
- list_del(&rdtgrp->mon.crdtgrp_list);
-
- kernfs_remove(rdtgrp->kn);
-
- return 0;
-}
-
-static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp)
-{
- rdtgrp->flags = RDT_DELETED;
- list_del(&rdtgrp->rdtgroup_list);
-
- kernfs_remove(rdtgrp->kn);
- return 0;
-}
-
-static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
-{
- u32 closid, rmid;
- int cpu;
-
- /* Give any tasks back to the default group */
- rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask);
-
- /* Give any CPUs back to the default group */
- cpumask_or(&rdtgroup_default.cpu_mask,
- &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
-
- /* Update per cpu closid and rmid of the moved CPUs first */
- closid = rdtgroup_default.closid;
- rmid = rdtgroup_default.mon.rmid;
- for_each_cpu(cpu, &rdtgrp->cpu_mask)
- resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
-
- /*
- * Update the MSR on moved CPUs and CPUs which have moved
- * task running on them.
- */
- cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
- update_closid_rmid(tmpmask, NULL);
-
- free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
- closid_free(rdtgrp->closid);
-
- rdtgroup_ctrl_remove(rdtgrp);
-
- /*
- * Free all the child monitor group rmids.
- */
- free_all_child_rdtgrp(rdtgrp);
-
- return 0;
-}
-
-static int rdtgroup_rmdir(struct kernfs_node *kn)
-{
- struct kernfs_node *parent_kn = kn->parent;
- struct rdtgroup *rdtgrp;
- cpumask_var_t tmpmask;
- int ret = 0;
-
- if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
- return -ENOMEM;
-
- rdtgrp = rdtgroup_kn_lock_live(kn);
- if (!rdtgrp) {
- ret = -EPERM;
- goto out;
- }
-
- /*
- * If the rdtgroup is a ctrl_mon group and parent directory
- * is the root directory, remove the ctrl_mon group.
- *
- * If the rdtgroup is a mon group and parent directory
- * is a valid "mon_groups" directory, remove the mon group.
- */
- if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn &&
- rdtgrp != &rdtgroup_default) {
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
- rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
- ret = rdtgroup_ctrl_remove(rdtgrp);
- } else {
- ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask);
- }
- } else if (rdtgrp->type == RDTMON_GROUP &&
- is_mon_groups(parent_kn, kn->name)) {
- ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask);
- } else {
- ret = -EPERM;
- }
-
-out:
- rdtgroup_kn_unlock(kn);
- free_cpumask_var(tmpmask);
- return ret;
-}
-
-/**
- * mongrp_reparent() - replace parent CTRL_MON group of a MON group
- * @rdtgrp: the MON group whose parent should be replaced
- * @new_prdtgrp: replacement parent CTRL_MON group for @rdtgrp
- * @cpus: cpumask provided by the caller for use during this call
- *
- * Replaces the parent CTRL_MON group for a MON group, resulting in all member
- * tasks' CLOSID immediately changing to that of the new parent group.
- * Monitoring data for the group is unaffected by this operation.
- */
-static void mongrp_reparent(struct rdtgroup *rdtgrp,
- struct rdtgroup *new_prdtgrp,
- cpumask_var_t cpus)
-{
- struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
-
- WARN_ON(rdtgrp->type != RDTMON_GROUP);
- WARN_ON(new_prdtgrp->type != RDTCTRL_GROUP);
-
- /* Nothing to do when simply renaming a MON group. */
- if (prdtgrp == new_prdtgrp)
- return;
-
- WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
- list_move_tail(&rdtgrp->mon.crdtgrp_list,
- &new_prdtgrp->mon.crdtgrp_list);
-
- rdtgrp->mon.parent = new_prdtgrp;
- rdtgrp->closid = new_prdtgrp->closid;
-
- /* Propagate updated closid to all tasks in this group. */
- rdt_move_group_tasks(rdtgrp, rdtgrp, cpus);
-
- update_closid_rmid(cpus, NULL);
-}
-
-static int rdtgroup_rename(struct kernfs_node *kn,
- struct kernfs_node *new_parent, const char *new_name)
-{
- struct rdtgroup *new_prdtgrp;
- struct rdtgroup *rdtgrp;
- cpumask_var_t tmpmask;
- int ret;
-
- rdtgrp = kernfs_to_rdtgroup(kn);
- new_prdtgrp = kernfs_to_rdtgroup(new_parent);
- if (!rdtgrp || !new_prdtgrp)
- return -ENOENT;
-
- /* Release both kernfs active_refs before obtaining rdtgroup mutex. */
- rdtgroup_kn_get(rdtgrp, kn);
- rdtgroup_kn_get(new_prdtgrp, new_parent);
-
- mutex_lock(&rdtgroup_mutex);
-
- rdt_last_cmd_clear();
-
- /*
- * Don't allow kernfs_to_rdtgroup() to return a parent rdtgroup if
- * either kernfs_node is a file.
- */
- if (kernfs_type(kn) != KERNFS_DIR ||
- kernfs_type(new_parent) != KERNFS_DIR) {
- rdt_last_cmd_puts("Source and destination must be directories");
- ret = -EPERM;
- goto out;
- }
-
- if ((rdtgrp->flags & RDT_DELETED) || (new_prdtgrp->flags & RDT_DELETED)) {
- ret = -ENOENT;
- goto out;
- }
-
- if (rdtgrp->type != RDTMON_GROUP || !kn->parent ||
- !is_mon_groups(kn->parent, kn->name)) {
- rdt_last_cmd_puts("Source must be a MON group\n");
- ret = -EPERM;
- goto out;
- }
-
- if (!is_mon_groups(new_parent, new_name)) {
- rdt_last_cmd_puts("Destination must be a mon_groups subdirectory\n");
- ret = -EPERM;
- goto out;
- }
-
- /*
- * If the MON group is monitoring CPUs, the CPUs must be assigned to the
- * current parent CTRL_MON group and therefore cannot be assigned to
- * the new parent, making the move illegal.
- */
- if (!cpumask_empty(&rdtgrp->cpu_mask) &&
- rdtgrp->mon.parent != new_prdtgrp) {
- rdt_last_cmd_puts("Cannot move a MON group that monitors CPUs\n");
- ret = -EPERM;
- goto out;
- }
-
- /*
- * Allocate the cpumask for use in mongrp_reparent() to avoid the
- * possibility of failing to allocate it after kernfs_rename() has
- * succeeded.
- */
- if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) {
- ret = -ENOMEM;
- goto out;
- }
-
- /*
- * Perform all input validation and allocations needed to ensure
- * mongrp_reparent() will succeed before calling kernfs_rename(),
- * otherwise it would be necessary to revert this call if
- * mongrp_reparent() failed.
- */
- ret = kernfs_rename(kn, new_parent, new_name);
- if (!ret)
- mongrp_reparent(rdtgrp, new_prdtgrp, tmpmask);
-
- free_cpumask_var(tmpmask);
-
-out:
- mutex_unlock(&rdtgroup_mutex);
- rdtgroup_kn_put(rdtgrp, kn);
- rdtgroup_kn_put(new_prdtgrp, new_parent);
- return ret;
-}
-
-static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
-{
- if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
- seq_puts(seq, ",cdp");
-
- if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
- seq_puts(seq, ",cdpl2");
-
- if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
- seq_puts(seq, ",mba_MBps");
-
- if (resctrl_debug)
- seq_puts(seq, ",debug");
-
- return 0;
-}
-
-static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = {
- .mkdir = rdtgroup_mkdir,
- .rmdir = rdtgroup_rmdir,
- .rename = rdtgroup_rename,
- .show_options = rdtgroup_show_options,
-};
-
-static int rdtgroup_setup_root(struct rdt_fs_context *ctx)
-{
- rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops,
- KERNFS_ROOT_CREATE_DEACTIVATED |
- KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK,
- &rdtgroup_default);
- if (IS_ERR(rdt_root))
- return PTR_ERR(rdt_root);
-
- ctx->kfc.root = rdt_root;
- rdtgroup_default.kn = kernfs_root_to_node(rdt_root);
-
- return 0;
-}
-
-static void rdtgroup_destroy_root(void)
-{
- kernfs_destroy_root(rdt_root);
- rdtgroup_default.kn = NULL;
-}
-
-static void rdtgroup_setup_default(void)
-{
- mutex_lock(&rdtgroup_mutex);
-
- rdtgroup_default.closid = RESCTRL_RESERVED_CLOSID;
- rdtgroup_default.mon.rmid = RESCTRL_RESERVED_RMID;
- rdtgroup_default.type = RDTCTRL_GROUP;
- INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list);
-
- list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
-
- mutex_unlock(&rdtgroup_mutex);
-}
-
-static void domain_destroy_mon_state(struct rdt_domain *d)
-{
- bitmap_free(d->rmid_busy_llc);
- kfree(d->mbm_total);
- kfree(d->mbm_local);
-}
-
-void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
-{
- mutex_lock(&rdtgroup_mutex);
-
- if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
- mba_sc_domain_destroy(r, d);
-
- if (!r->mon_capable)
- goto out_unlock;
-
- /*
- * If resctrl is mounted, remove all the
- * per domain monitor data directories.
- */
- if (resctrl_mounted && resctrl_arch_mon_capable())
- rmdir_mondata_subdir_allrdtgrp(r, d->id);
-
- if (resctrl_is_mbm_enabled())
- cancel_delayed_work(&d->mbm_over);
- if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
- /*
- * When a package is going down, forcefully
- * decrement rmid->ebusy. There is no way to know
- * that the L3 was flushed and hence may lead to
- * incorrect counts in rare scenarios, but leaving
- * the RMID as busy creates RMID leaks if the
- * package never comes back.
- */
- __check_limbo(d, true);
- cancel_delayed_work(&d->cqm_limbo);
- }
-
- domain_destroy_mon_state(d);
-
-out_unlock:
- mutex_unlock(&rdtgroup_mutex);
-}
-
-static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
-{
- u32 idx_limit = resctrl_arch_system_num_rmid_idx();
- size_t tsize;
-
- if (resctrl_arch_is_llc_occupancy_enabled()) {
- d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
- if (!d->rmid_busy_llc)
- return -ENOMEM;
- }
- if (resctrl_arch_is_mbm_total_enabled()) {
- tsize = sizeof(*d->mbm_total);
- d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
- if (!d->mbm_total) {
- bitmap_free(d->rmid_busy_llc);
- return -ENOMEM;
- }
- }
- if (resctrl_arch_is_mbm_local_enabled()) {
- tsize = sizeof(*d->mbm_local);
- d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
- if (!d->mbm_local) {
- bitmap_free(d->rmid_busy_llc);
- kfree(d->mbm_total);
- return -ENOMEM;
- }
- }
-
- return 0;
-}
-
-int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
-{
- int err = 0;
-
- mutex_lock(&rdtgroup_mutex);
-
- if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) {
- /* RDT_RESOURCE_MBA is never mon_capable */
- err = mba_sc_domain_allocate(r, d);
- goto out_unlock;
- }
-
- if (!r->mon_capable)
- goto out_unlock;
-
- err = domain_setup_mon_state(r, d);
- if (err)
- goto out_unlock;
-
- if (resctrl_is_mbm_enabled()) {
- INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
- mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
- RESCTRL_PICK_ANY_CPU);
- }
-
- if (resctrl_arch_is_llc_occupancy_enabled())
- INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
-
- /*
- * If the filesystem is not mounted then only the default resource group
- * exists. Creation of its directories is deferred until mount time
- * by rdt_get_tree() calling mkdir_mondata_all().
- * If resctrl is mounted, add per domain monitor data directories.
- */
- if (resctrl_mounted && resctrl_arch_mon_capable())
- mkdir_mondata_subdir_allrdtgrp(r, d);
-
-out_unlock:
- mutex_unlock(&rdtgroup_mutex);
-
- return err;
-}
-
-void resctrl_online_cpu(unsigned int cpu)
-{
- mutex_lock(&rdtgroup_mutex);
- /* The CPU is set in default rdtgroup after online. */
- cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
- mutex_unlock(&rdtgroup_mutex);
-}
-
-static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
-{
- struct rdtgroup *cr;
-
- list_for_each_entry(cr, &r->mon.crdtgrp_list, mon.crdtgrp_list) {
- if (cpumask_test_and_clear_cpu(cpu, &cr->cpu_mask))
- break;
- }
-}
-
-void resctrl_offline_cpu(unsigned int cpu)
-{
- struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
- struct rdtgroup *rdtgrp;
- struct rdt_domain *d;
-
- mutex_lock(&rdtgroup_mutex);
- list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
- if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask)) {
- clear_childcpus(rdtgrp, cpu);
- break;
- }
- }
-
- if (!l3->mon_capable)
- goto out_unlock;
-
- d = resctrl_get_domain_from_cpu(cpu, l3);
- if (d) {
- if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
- cancel_delayed_work(&d->mbm_over);
- mbm_setup_overflow_handler(d, 0, cpu);
- }
- if (resctrl_arch_is_llc_occupancy_enabled() &&
- cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
- cancel_delayed_work(&d->cqm_limbo);
- cqm_setup_limbo_handler(d, 0, cpu);
- }
- }
-
-out_unlock:
- mutex_unlock(&rdtgroup_mutex);
-}
-
-/*
- * resctrl_init - resctrl filesystem initialization
- *
- * Setup resctrl file system including set up root, create mount point,
- * register resctrl filesystem, and initialize files under root directory.
- *
- * Return: 0 on success or -errno
- */
-int resctrl_init(void)
-{
- int ret = 0;
-
- seq_buf_init(&last_cmd_status, last_cmd_status_buf,
- sizeof(last_cmd_status_buf));
-
- rdtgroup_setup_default();
-
- thread_throttle_mode_init();
-
- ret = resctrl_mon_resource_init();
- if (ret)
- return ret;
-
- ret = sysfs_create_mount_point(fs_kobj, "resctrl");
- if (ret)
- return ret;
-
- ret = register_filesystem(&rdt_fs_type);
- if (ret)
- goto cleanup_mountpoint;
-
- /*
- * Adding the resctrl debugfs directory here may not be ideal since
- * it would let the resctrl debugfs directory appear on the debugfs
- * filesystem before the resctrl filesystem is mounted.
- * It may also be ok since that would enable debugging of RDT before
- * resctrl is mounted.
- * The reason why the debugfs directory is created here and not in
- * rdt_get_tree() is because rdt_get_tree() takes rdtgroup_mutex and
- * during the debugfs directory creation also &sb->s_type->i_mutex_key
- * (the lockdep class of inode->i_rwsem). Other filesystem
- * interactions (eg. SyS_getdents) have the lock ordering:
- * &sb->s_type->i_mutex_key --> &mm->mmap_lock
- * During mmap(), called with &mm->mmap_lock, the rdtgroup_mutex
- * is taken, thus creating dependency:
- * &mm->mmap_lock --> rdtgroup_mutex for the latter that can cause
- * issues considering the other two lock dependencies.
- * By creating the debugfs directory here we avoid a dependency
- * that may cause deadlock (even though file operations cannot
- * occur until the filesystem is mounted, but I do not know how to
- * tell lockdep that).
- */
- debugfs_resctrl = debugfs_create_dir("resctrl", NULL);
-
- return 0;
-
-cleanup_mountpoint:
- sysfs_remove_mount_point(fs_kobj, "resctrl");
-
- return ret;
-}
-
-void resctrl_exit(void)
-{
- debugfs_remove_recursive(debugfs_resctrl);
- unregister_filesystem(&rdt_fs_type);
- sysfs_remove_mount_point(fs_kobj, "resctrl");
-
- resctrl_mon_resource_exit();
+ for_each_alloc_capable_rdt_resource(r)
+ reset_all_ctrls(r);
}
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index e69de29bb2d1..a8f2dd66ede3 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -0,0 +1,527 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Resource Director Technology(RDT)
+ * - Cache Allocation code.
+ *
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * Authors:
+ * Fenghua Yu <fenghua.yu@...el.com>
+ * Tony Luck <tony.luck@...el.com>
+ *
+ * More information about RDT be found in the Intel (R) x86 Architecture
+ * Software Developer Manual June 2016, volume 3, section 17.17.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cpu.h>
+#include <linux/kernfs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+struct rdt_parse_data {
+ struct rdtgroup *rdtgrp;
+ char *buf;
+};
+
+typedef int (ctrlval_parser_t)(struct rdt_parse_data *data,
+ struct resctrl_schema *s,
+ struct rdt_domain *d);
+
+/*
+ * Check whether MBA bandwidth percentage value is correct. The value is
+ * checked against the minimum and max bandwidth values specified by the
+ * hardware. The allocated bandwidth percentage is rounded to the next
+ * control step available on the hardware.
+ */
+static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
+{
+ unsigned long bw;
+ int ret;
+
+ /*
+ * Only linear delay values is supported for current Intel SKUs.
+ */
+ if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
+ rdt_last_cmd_puts("No support for non-linear MB domains\n");
+ return false;
+ }
+
+ ret = kstrtoul(buf, 10, &bw);
+ if (ret) {
+ rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
+ return false;
+ }
+
+ if ((bw < r->membw.min_bw || bw > r->default_ctrl) &&
+ !is_mba_sc(r)) {
+ rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
+ r->membw.min_bw, r->default_ctrl);
+ return false;
+ }
+
+ *data = roundup(bw, (unsigned long)r->membw.bw_gran);
+ return true;
+}
+
+static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
+ struct rdt_domain *d)
+{
+ struct resctrl_staged_config *cfg;
+ u32 closid = data->rdtgrp->closid;
+ struct rdt_resource *r = s->res;
+ unsigned long bw_val;
+
+ cfg = &d->staged_config[s->conf_type];
+ if (cfg->have_new_ctrl) {
+ rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
+ return -EINVAL;
+ }
+
+ if (!bw_validate(data->buf, &bw_val, r))
+ return -EINVAL;
+
+ if (is_mba_sc(r)) {
+ d->mbps_val[closid] = bw_val;
+ return 0;
+ }
+
+ cfg->new_ctrl = bw_val;
+ cfg->have_new_ctrl = true;
+
+ return 0;
+}
+
+/*
+ * Check whether a cache bit mask is valid.
+ * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
+ * - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
+ * - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
+ *
+ * Haswell does not support a non-contiguous 1s value and additionally
+ * requires at least two bits set.
+ * AMD allows non-contiguous bitmasks.
+ */
+static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
+{
+ unsigned long first_bit, zero_bit, val;
+ unsigned int cbm_len = r->cache.cbm_len;
+ int ret;
+
+ ret = kstrtoul(buf, 16, &val);
+ if (ret) {
+ rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
+ return false;
+ }
+
+ if ((r->cache.min_cbm_bits > 0 && val == 0) || val > r->default_ctrl) {
+ rdt_last_cmd_puts("Mask out of range\n");
+ return false;
+ }
+
+ first_bit = find_first_bit(&val, cbm_len);
+ zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
+
+ /* Are non-contiguous bitmasks allowed? */
+ if (!r->cache.arch_has_sparse_bitmasks &&
+ (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
+ rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
+ return false;
+ }
+
+ if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
+ rdt_last_cmd_printf("Need at least %d bits in the mask\n",
+ r->cache.min_cbm_bits);
+ return false;
+ }
+
+ *data = val;
+ return true;
+}
+
+/*
+ * Read one cache bit mask (hex). Check that it is valid for the current
+ * resource type.
+ */
+static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
+ struct rdt_domain *d)
+{
+ struct rdtgroup *rdtgrp = data->rdtgrp;
+ struct resctrl_staged_config *cfg;
+ struct rdt_resource *r = s->res;
+ u32 cbm_val;
+
+ cfg = &d->staged_config[s->conf_type];
+ if (cfg->have_new_ctrl) {
+ rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
+ return -EINVAL;
+ }
+
+ /*
+ * Cannot set up more than one pseudo-locked region in a cache
+ * hierarchy.
+ */
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+ rdtgroup_pseudo_locked_in_hierarchy(d)) {
+ rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
+ return -EINVAL;
+ }
+
+ if (!cbm_validate(data->buf, &cbm_val, r))
+ return -EINVAL;
+
+ if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+ rdtgrp->mode == RDT_MODE_SHAREABLE) &&
+ rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
+ rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
+ return -EINVAL;
+ }
+
+ /*
+ * The CBM may not overlap with the CBM of another closid if
+ * either is exclusive.
+ */
+ if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
+ rdt_last_cmd_puts("Overlaps with exclusive group\n");
+ return -EINVAL;
+ }
+
+ if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
+ if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ rdt_last_cmd_puts("Overlaps with other group\n");
+ return -EINVAL;
+ }
+ }
+
+ cfg->new_ctrl = cbm_val;
+ cfg->have_new_ctrl = true;
+
+ return 0;
+}
+
+static ctrlval_parser_t *get_parser(struct rdt_resource *res)
+{
+ if (res->fflags & RFTYPE_RES_CACHE)
+ return &parse_cbm;
+ else
+ return &parse_bw;
+}
+
+/*
+ * For each domain in this resource we expect to find a series of:
+ * id=mask
+ * separated by ";". The "id" is in decimal, and must match one of
+ * the "id"s for this resource.
+ */
+static int parse_line(char *line, struct resctrl_schema *s,
+ struct rdtgroup *rdtgrp)
+{
+ ctrlval_parser_t *parse_ctrlval = get_parser(s->res);
+ enum resctrl_conf_type t = s->conf_type;
+ struct resctrl_staged_config *cfg;
+ struct rdt_resource *r = s->res;
+ struct rdt_parse_data data;
+ char *dom = NULL, *id;
+ struct rdt_domain *d;
+ unsigned long dom_id;
+
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+ (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
+ rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
+ return -EINVAL;
+ }
+
+next:
+ if (!line || line[0] == '\0')
+ return 0;
+ dom = strsep(&line, ";");
+ id = strsep(&dom, "=");
+ if (!dom || kstrtoul(id, 10, &dom_id)) {
+ rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
+ return -EINVAL;
+ }
+ dom = strim(dom);
+ list_for_each_entry(d, &r->domains, list) {
+ if (d->id == dom_id) {
+ data.buf = dom;
+ data.rdtgrp = rdtgrp;
+ if (parse_ctrlval(&data, s, d))
+ return -EINVAL;
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ cfg = &d->staged_config[t];
+ /*
+ * In pseudo-locking setup mode and just
+ * parsed a valid CBM that should be
+ * pseudo-locked. Only one locked region per
+ * resource group and domain so just do
+ * the required initialization for single
+ * region and return.
+ */
+ rdtgrp->plr->s = s;
+ rdtgrp->plr->d = d;
+ rdtgrp->plr->cbm = cfg->new_ctrl;
+ d->plr = rdtgrp->plr;
+ return 0;
+ }
+ goto next;
+ }
+ }
+ return -EINVAL;
+}
+
+static int rdtgroup_parse_resource(char *resname, char *tok,
+ struct rdtgroup *rdtgrp)
+{
+ struct resctrl_schema *s;
+
+ list_for_each_entry(s, &resctrl_schema_all, list) {
+ if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
+ return parse_line(tok, s, rdtgrp);
+ }
+ rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
+ return -EINVAL;
+}
+
+ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ struct resctrl_schema *s;
+ struct rdtgroup *rdtgrp;
+ struct rdt_resource *r;
+ char *tok, *resname;
+ int ret = 0;
+
+ /* Valid input requires a trailing newline */
+ if (nbytes == 0 || buf[nbytes - 1] != '\n')
+ return -EINVAL;
+ buf[nbytes - 1] = '\0';
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ rdtgroup_kn_unlock(of->kn);
+ return -ENOENT;
+ }
+ rdt_last_cmd_clear();
+
+ /*
+ * No changes to pseudo-locked region allowed. It has to be removed
+ * and re-created instead.
+ */
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+ ret = -EINVAL;
+ rdt_last_cmd_puts("Resource group is pseudo-locked\n");
+ goto out;
+ }
+
+ rdt_staged_configs_clear();
+
+ while ((tok = strsep(&buf, "\n")) != NULL) {
+ resname = strim(strsep(&tok, ":"));
+ if (!tok) {
+ rdt_last_cmd_puts("Missing ':'\n");
+ ret = -EINVAL;
+ goto out;
+ }
+ if (tok[0] == '\0') {
+ rdt_last_cmd_printf("Missing '%s' value\n", resname);
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
+ if (ret)
+ goto out;
+ }
+
+ list_for_each_entry(s, &resctrl_schema_all, list) {
+ r = s->res;
+
+ /*
+ * Writes to mba_sc resources update the software controller,
+ * not the control MSR.
+ */
+ if (is_mba_sc(r))
+ continue;
+
+ ret = resctrl_arch_update_domains(r, rdtgrp->closid);
+ if (ret)
+ goto out;
+ }
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ /*
+ * If pseudo-locking fails we keep the resource group in
+ * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
+ * active and updated for just the domain the pseudo-locked
+ * region was requested for.
+ */
+ ret = rdtgroup_pseudo_lock_create(rdtgrp);
+ }
+
+out:
+ rdt_staged_configs_clear();
+ rdtgroup_kn_unlock(of->kn);
+ return ret ?: nbytes;
+}
+
+static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
+{
+ struct rdt_resource *r = schema->res;
+ struct rdt_domain *dom;
+ bool sep = false;
+ u32 ctrl_val;
+
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
+
+ seq_printf(s, "%*s:", max_name_width, schema->name);
+ list_for_each_entry(dom, &r->domains, list) {
+ if (sep)
+ seq_puts(s, ";");
+
+ if (is_mba_sc(r))
+ ctrl_val = dom->mbps_val[closid];
+ else
+ ctrl_val = resctrl_arch_get_config(r, dom, closid,
+ schema->conf_type);
+
+ seq_printf(s, r->format_str, dom->id, max_data_width,
+ ctrl_val);
+ sep = true;
+ }
+ seq_puts(s, "\n");
+}
+
+int rdtgroup_schemata_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct resctrl_schema *schema;
+ struct rdtgroup *rdtgrp;
+ int ret = 0;
+ u32 closid;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (rdtgrp) {
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ list_for_each_entry(schema, &resctrl_schema_all, list) {
+ seq_printf(s, "%s:uninitialized\n", schema->name);
+ }
+ } else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+ if (!rdtgrp->plr->d) {
+ rdt_last_cmd_clear();
+ rdt_last_cmd_puts("Cache domain offline\n");
+ ret = -ENODEV;
+ } else {
+ seq_printf(s, "%s:%d=%x\n",
+ rdtgrp->plr->s->res->name,
+ rdtgrp->plr->d->id,
+ rdtgrp->plr->cbm);
+ }
+ } else {
+ closid = rdtgrp->closid;
+ list_for_each_entry(schema, &resctrl_schema_all, list) {
+ if (closid < schema->num_closid)
+ show_doms(s, schema, closid);
+ }
+ }
+ } else {
+ ret = -ENOENT;
+ }
+ rdtgroup_kn_unlock(of->kn);
+ return ret;
+}
+
+static int smp_mon_event_count(void *arg)
+{
+ mon_event_count(arg);
+
+ return 0;
+}
+
+void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
+ struct rdt_domain *d, struct rdtgroup *rdtgrp,
+ int evtid, int first)
+{
+ int cpu;
+
+ /* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
+
+ /*
+ * Setup the parameters to pass to mon_event_count() to read the data.
+ */
+ rr->rgrp = rdtgrp;
+ rr->evtid = evtid;
+ rr->r = r;
+ rr->d = d;
+ rr->val = 0;
+ rr->first = first;
+ rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
+ if (IS_ERR(rr->arch_mon_ctx)) {
+ rr->err = -EINVAL;
+ return;
+ }
+
+ cpu = cpumask_any_housekeeping(&d->cpu_mask, RESCTRL_PICK_ANY_CPU);
+
+ /*
+ * cpumask_any_housekeeping() prefers housekeeping CPUs, but
+ * are all the CPUs nohz_full? If yes, pick a CPU to IPI.
+ * MPAM's resctrl_arch_rmid_read() is unable to read the
+ * counters on some platforms if its called in IRQ context.
+ */
+ if (tick_nohz_full_cpu(cpu))
+ smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
+ else
+ smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
+
+ resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
+}
+
+int rdtgroup_mondata_show(struct seq_file *m, void *arg)
+{
+ struct kernfs_open_file *of = m->private;
+ u32 resid, evtid, domid;
+ struct rdtgroup *rdtgrp;
+ struct rdt_resource *r;
+ union mon_data_bits md;
+ struct rdt_domain *d;
+ struct rmid_read rr;
+ int ret = 0;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ md.priv = of->kn->priv;
+ resid = md.u.rid;
+ domid = md.u.domid;
+ evtid = md.u.evtid;
+
+ r = resctrl_arch_get_resource(resid);
+ d = resctrl_arch_find_domain(r, domid);
+ if (IS_ERR_OR_NULL(d)) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ mon_event_read(&rr, r, d, rdtgrp, evtid, false);
+
+ if (rr.err == -EIO)
+ seq_puts(m, "Error\n");
+ else if (rr.err == -EINVAL)
+ seq_puts(m, "Unavailable\n");
+ else
+ seq_printf(m, "%llu\n", rr.val);
+
+out:
+ rdtgroup_kn_unlock(of->kn);
+ return ret;
+}
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index e69de29bb2d1..f73267762a87 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -0,0 +1,340 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _FS_RESCTRL_INTERNAL_H
+#define _FS_RESCTRL_INTERNAL_H
+
+#include <linux/resctrl.h>
+#include <linux/sched.h>
+#include <linux/kernfs.h>
+#include <linux/fs_context.h>
+#include <linux/jump_label.h>
+#include <linux/tick.h>
+
+#include <asm/resctrl.h>
+
+/**
+ * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
+ * aren't marked nohz_full
+ * @mask: The mask to pick a CPU from.
+ * @exclude_cpu:The CPU to avoid picking.
+ *
+ * Returns a CPU from @mask, but not @exclude_cpu. If there are housekeeping
+ * CPUs that don't use nohz_full, these are preferred. Pass
+ * RESCTRL_PICK_ANY_CPU to avoid excluding any CPUs.
+ *
+ * When a CPU is excluded, returns >= nr_cpu_ids if no CPUs are available.
+ */
+static inline unsigned int
+cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
+{
+ unsigned int cpu, hk_cpu;
+
+ if (exclude_cpu == RESCTRL_PICK_ANY_CPU)
+ cpu = cpumask_any(mask);
+ else
+ cpu = cpumask_any_but(mask, exclude_cpu);
+
+ if (!IS_ENABLED(CONFIG_NO_HZ_FULL))
+ return cpu;
+
+ /* If the CPU picked isn't marked nohz_full nothing more needs doing. */
+ if (cpu < nr_cpu_ids && !tick_nohz_full_cpu(cpu))
+ return cpu;
+
+ /* Try to find a CPU that isn't nohz_full to use in preference */
+ hk_cpu = cpumask_nth_andnot(0, mask, tick_nohz_full_mask);
+ if (hk_cpu == exclude_cpu)
+ hk_cpu = cpumask_nth_andnot(1, mask, tick_nohz_full_mask);
+
+ if (hk_cpu < nr_cpu_ids)
+ cpu = hk_cpu;
+
+ return cpu;
+}
+
+struct rdt_fs_context {
+ struct kernfs_fs_context kfc;
+ bool enable_cdpl2;
+ bool enable_cdpl3;
+ bool enable_mba_mbps;
+ bool enable_debug;
+};
+
+static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
+{
+ struct kernfs_fs_context *kfc = fc->fs_private;
+
+ return container_of(kfc, struct rdt_fs_context, kfc);
+}
+
+/**
+ * struct mon_evt - Entry in the event list of a resource
+ * @evtid: event id
+ * @name: name of the event
+ * @configurable: true if the event is configurable
+ * @list: entry in &rdt_resource->evt_list
+ */
+struct mon_evt {
+ enum resctrl_event_id evtid;
+ char *name;
+ bool configurable;
+ struct list_head list;
+};
+
+/**
+ * union mon_data_bits - Monitoring details for each event file
+ * @priv: Used to store monitoring event data in @u
+ * as kernfs private data
+ * @rid: Resource id associated with the event file
+ * @evtid: Event id associated with the event file
+ * @domid: The domain to which the event file belongs
+ * @u: Name of the bit fields struct
+ */
+union mon_data_bits {
+ void *priv;
+ struct {
+ unsigned int rid : 10;
+ enum resctrl_event_id evtid : 8;
+ unsigned int domid : 14;
+ } u;
+};
+
+struct rmid_read {
+ struct rdtgroup *rgrp;
+ struct rdt_resource *r;
+ struct rdt_domain *d;
+ enum resctrl_event_id evtid;
+ bool first;
+ int err;
+ u64 val;
+ void *arch_mon_ctx;
+};
+
+extern struct list_head resctrl_schema_all;
+extern bool resctrl_mounted;
+
+enum rdt_group_type {
+ RDTCTRL_GROUP = 0,
+ RDTMON_GROUP,
+ RDT_NUM_GROUP,
+};
+
+/**
+ * enum rdtgrp_mode - Mode of a RDT resource group
+ * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
+ * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
+ * @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking
+ * @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations
+ * allowed AND the allocations are Cache Pseudo-Locked
+ * @RDT_NUM_MODES: Total number of modes
+ *
+ * The mode of a resource group enables control over the allowed overlap
+ * between allocations associated with different resource groups (classes
+ * of service). User is able to modify the mode of a resource group by
+ * writing to the "mode" resctrl file associated with the resource group.
+ *
+ * The "shareable", "exclusive", and "pseudo-locksetup" modes are set by
+ * writing the appropriate text to the "mode" file. A resource group enters
+ * "pseudo-locked" mode after the schemata is written while the resource
+ * group is in "pseudo-locksetup" mode.
+ */
+enum rdtgrp_mode {
+ RDT_MODE_SHAREABLE = 0,
+ RDT_MODE_EXCLUSIVE,
+ RDT_MODE_PSEUDO_LOCKSETUP,
+ RDT_MODE_PSEUDO_LOCKED,
+
+ /* Must be last */
+ RDT_NUM_MODES,
+};
+
+/**
+ * struct mongroup - store mon group's data in resctrl fs.
+ * @mon_data_kn: kernfs node for the mon_data directory
+ * @parent: parent rdtgrp
+ * @crdtgrp_list: child rdtgroup node list
+ * @rmid: rmid for this rdtgroup
+ */
+struct mongroup {
+ struct kernfs_node *mon_data_kn;
+ struct rdtgroup *parent;
+ struct list_head crdtgrp_list;
+ u32 rmid;
+};
+
+/**
+ * struct rdtgroup - store rdtgroup's data in resctrl file system.
+ * @kn: kernfs node
+ * @rdtgroup_list: linked list for all rdtgroups
+ * @closid: closid for this rdtgroup
+ * @cpu_mask: CPUs assigned to this rdtgroup
+ * @flags: status bits
+ * @waitcount: how many cpus expect to find this
+ * group when they acquire rdtgroup_mutex
+ * @type: indicates type of this rdtgroup - either
+ * monitor only or ctrl_mon group
+ * @mon: mongroup related data
+ * @mode: mode of resource group
+ * @plr: pseudo-locked region
+ */
+struct rdtgroup {
+ struct kernfs_node *kn;
+ struct list_head rdtgroup_list;
+ u32 closid;
+ struct cpumask cpu_mask;
+ int flags;
+ atomic_t waitcount;
+ enum rdt_group_type type;
+ struct mongroup mon;
+ enum rdtgrp_mode mode;
+ struct pseudo_lock_region *plr;
+};
+
+/* List of all resource groups */
+extern struct list_head rdt_all_groups;
+
+extern int max_name_width, max_data_width;
+
+/**
+ * struct rftype - describe each file in the resctrl file system
+ * @name: File name
+ * @mode: Access mode
+ * @kf_ops: File operations
+ * @flags: File specific RFTYPE_FLAGS_* flags
+ * @fflags: File specific RFTYPE_* flags
+ * @seq_show: Show content of the file
+ * @write: Write to the file
+ */
+struct rftype {
+ char *name;
+ umode_t mode;
+ const struct kernfs_ops *kf_ops;
+ unsigned long flags;
+ unsigned long fflags;
+
+ int (*seq_show)(struct kernfs_open_file *of,
+ struct seq_file *sf, void *v);
+ /*
+ * write() is the generic write callback which maps directly to
+ * kernfs write operation and overrides all other operations.
+ * Maximum write size is determined by ->max_write_len.
+ */
+ ssize_t (*write)(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off);
+};
+
+/**
+ * struct mbm_state - status for each MBM counter in each domain
+ * @prev_bw_bytes: Previous bytes value read for bandwidth calculation
+ * @prev_bw: The most recent bandwidth in MBps
+ */
+struct mbm_state {
+ u64 prev_bw_bytes;
+ u32 prev_bw;
+};
+
+static inline bool is_mba_sc(struct rdt_resource *r)
+{
+ if (!r)
+ r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+ /*
+ * The software controller support is only applicable to MBA resource.
+ * Make sure to check for resource type.
+ */
+ if (r->rid != RDT_RESOURCE_MBA)
+ return false;
+
+ return r->membw.mba_sc;
+}
+
+extern struct mutex rdtgroup_mutex;
+extern struct rdtgroup rdtgroup_default;
+extern struct dentry *debugfs_resctrl;
+
+void rdt_last_cmd_clear(void);
+void rdt_last_cmd_puts(const char *s);
+__printf(1, 2)
+void rdt_last_cmd_printf(const char *fmt, ...);
+
+struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
+void rdtgroup_kn_unlock(struct kernfs_node *kn);
+int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
+int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
+ umode_t mask);
+ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off);
+int rdtgroup_schemata_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v);
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
+ unsigned long cbm, int closid, bool exclusive);
+unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
+ unsigned long cbm);
+enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
+int rdtgroup_tasks_assigned(struct rdtgroup *r);
+int closids_supported(void);
+void closid_free(int closid);
+int alloc_rmid(u32 closid);
+void free_rmid(u32 closid, u32 rmid);
+void resctrl_mon_resource_exit(void);
+void mon_event_count(void *info);
+int rdtgroup_mondata_show(struct seq_file *m, void *arg);
+void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
+ struct rdt_domain *d, struct rdtgroup *rdtgrp,
+ int evtid, int first);
+int resctrl_mon_resource_init(void);
+void mbm_setup_overflow_handler(struct rdt_domain *dom,
+ unsigned long delay_ms,
+ int exclude_cpu);
+void mbm_handle_overflow(struct work_struct *work);
+bool is_mba_sc(struct rdt_resource *r);
+void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
+ int exclude_cpu);
+void cqm_handle_limbo(struct work_struct *work);
+bool has_busy_rmid(struct rdt_domain *d);
+void __check_limbo(struct rdt_domain *d, bool force_free);
+void mbm_config_rftype_init(const char *config);
+void rdt_staged_configs_clear(void);
+bool closid_allocated(unsigned int closid);
+int resctrl_find_cleanest_closid(void);
+
+#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
+int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
+int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
+int rdt_pseudo_lock_init(void);
+void rdt_pseudo_lock_release(void);
+int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
+void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
+#else
+static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
+{
+ return false;
+}
+
+static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
+{
+ return false;
+}
+
+static inline int rdt_pseudo_lock_init(void) { return 0; }
+static inline void rdt_pseudo_lock_release(void) { }
+static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
+#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
+
+#endif /* _FS_RESCTRL_INTERNAL_H */
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index e69de29bb2d1..14a9f18efe45 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -0,0 +1,843 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Resource Director Technology(RDT)
+ * - Monitoring code
+ *
+ * Copyright (C) 2017 Intel Corporation
+ *
+ * Author:
+ * Vikas Shivappa <vikas.shivappa@...el.com>
+ *
+ * This replaces the cqm.c based on perf but we reuse a lot of
+ * code and datastructures originally from Peter Zijlstra and Matt Fleming.
+ *
+ * More information about RDT be found in the Intel (R) x86 Architecture
+ * Software Developer Manual June 2016, volume 3, section 17.17.
+ */
+
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+/*
+ * struct rmid_entry - dirty tracking for all RMID.
+ * @closid: The CLOSID for this entry.
+ * @rmid: The RMID for this entry.
+ * @busy: The number of domains with cached data using this RMID.
+ * @list: Member of the rmid_free_lru list when busy == 0.
+ *
+ * Depending on the architecture the correct monitor is accessed using
+ * both @closid and @rmid, or @rmid only.
+ *
+ * Take the rdtgroup_mutex when accessing.
+ */
+struct rmid_entry {
+ u32 closid;
+ u32 rmid;
+ int busy;
+ struct list_head list;
+};
+
+/*
+ * @rmid_free_lru - A least recently used list of free RMIDs
+ * These RMIDs are guaranteed to have an occupancy less than the
+ * threshold occupancy
+ */
+static LIST_HEAD(rmid_free_lru);
+
+/*
+ * @closid_num_dirty_rmid The number of dirty RMID each CLOSID has.
+ * Only allocated when CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID is defined.
+ * Indexed by CLOSID. Protected by rdtgroup_mutex.
+ */
+static u32 *closid_num_dirty_rmid;
+
+/*
+ * @rmid_limbo_count - count of currently unused but (potentially)
+ * dirty RMIDs.
+ * This counts RMIDs that no one is currently using but that
+ * may have a occupancy value > resctrl_rmid_realloc_threshold. User can
+ * change the threshold occupancy value.
+ */
+static unsigned int rmid_limbo_count;
+
+/*
+ * @rmid_entry - The entry in the limbo and free lists.
+ */
+static struct rmid_entry *rmid_ptrs;
+
+/*
+ * This is the threshold cache occupancy in bytes at which we will consider an
+ * RMID available for re-allocation.
+ */
+unsigned int resctrl_rmid_realloc_threshold;
+
+/*
+ * This is the maximum value for the reallocation threshold, in bytes.
+ */
+unsigned int resctrl_rmid_realloc_limit;
+
+/*
+ * x86 and arm64 differ in their handling of monitoring.
+ * x86's RMID are independent numbers, there is only one source of traffic
+ * with an RMID value of '1'.
+ * arm64's PMG extends the PARTID/CLOSID space, there are multiple sources of
+ * traffic with a PMG value of '1', one for each CLOSID, meaning the RMID
+ * value is no longer unique.
+ * To account for this, resctrl uses an index. On x86 this is just the RMID,
+ * on arm64 it encodes the CLOSID and RMID. This gives a unique number.
+ *
+ * The domain's rmid_busy_llc and rmid_ptrs[] are sized by index. The arch code
+ * must accept an attempt to read every index.
+ */
+static inline struct rmid_entry *__rmid_entry(u32 idx)
+{
+ struct rmid_entry *entry;
+ u32 closid, rmid;
+
+ entry = &rmid_ptrs[idx];
+ resctrl_arch_rmid_idx_decode(idx, &closid, &rmid);
+
+ WARN_ON_ONCE(entry->closid != closid);
+ WARN_ON_ONCE(entry->rmid != rmid);
+
+ return entry;
+}
+
+static void limbo_release_entry(struct rmid_entry *entry)
+{
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ rmid_limbo_count--;
+ list_add_tail(&entry->list, &rmid_free_lru);
+
+ if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+ closid_num_dirty_rmid[entry->closid]--;
+}
+
+/*
+ * Check the RMIDs that are marked as busy for this domain. If the
+ * reported LLC occupancy is below the threshold clear the busy bit and
+ * decrement the count. If the busy count gets to zero on an RMID, we
+ * free the RMID
+ */
+void __check_limbo(struct rdt_domain *d, bool force_free)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+ u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+ struct rmid_entry *entry;
+ u32 idx, cur_idx = 1;
+ void *arch_mon_ctx;
+ bool rmid_dirty;
+ u64 val = 0;
+
+ arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, QOS_L3_OCCUP_EVENT_ID);
+ if (IS_ERR(arch_mon_ctx)) {
+ pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+ PTR_ERR(arch_mon_ctx));
+ return;
+ }
+
+ /*
+ * Skip RMID 0 and start from RMID 1 and check all the RMIDs that
+ * are marked as busy for occupancy < threshold. If the occupancy
+ * is less than the threshold decrement the busy counter of the
+ * RMID and move it to the free list when the counter reaches 0.
+ */
+ for (;;) {
+ idx = find_next_bit(d->rmid_busy_llc, idx_limit, cur_idx);
+ if (idx >= idx_limit)
+ break;
+
+ entry = __rmid_entry(idx);
+ if (resctrl_arch_rmid_read(r, d, entry->closid, entry->rmid,
+ QOS_L3_OCCUP_EVENT_ID, &val,
+ arch_mon_ctx)) {
+ rmid_dirty = true;
+ } else {
+ rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
+ }
+
+ if (force_free || !rmid_dirty) {
+ clear_bit(idx, d->rmid_busy_llc);
+ if (!--entry->busy)
+ limbo_release_entry(entry);
+ }
+ cur_idx = idx + 1;
+ }
+
+ resctrl_arch_mon_ctx_free(r, QOS_L3_OCCUP_EVENT_ID, arch_mon_ctx);
+}
+
+bool has_busy_rmid(struct rdt_domain *d)
+{
+ u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+
+ return find_first_bit(d->rmid_busy_llc, idx_limit) != idx_limit;
+}
+
+static struct rmid_entry *resctrl_find_free_rmid(u32 closid)
+{
+ struct rmid_entry *itr;
+ u32 itr_idx, cmp_idx;
+
+ if (list_empty(&rmid_free_lru))
+ return rmid_limbo_count ? ERR_PTR(-EBUSY) : ERR_PTR(-ENOSPC);
+
+ list_for_each_entry(itr, &rmid_free_lru, list) {
+ /*
+ * Get the index of this free RMID, and the index it would need
+ * to be if it were used with this CLOSID.
+ * If the CLOSID is irrelevant on this architecture, the two
+ * index values are always the same on every entry and thus the
+ * very first entry will be returned.
+ */
+ itr_idx = resctrl_arch_rmid_idx_encode(itr->closid, itr->rmid);
+ cmp_idx = resctrl_arch_rmid_idx_encode(closid, itr->rmid);
+
+ if (itr_idx == cmp_idx)
+ return itr;
+ }
+
+ return ERR_PTR(-ENOSPC);
+}
+
+/**
+ * resctrl_find_cleanest_closid() - Find a CLOSID where all the associated
+ * RMID are clean, or the CLOSID that has
+ * the most clean RMID.
+ *
+ * MPAM's equivalent of RMID are per-CLOSID, meaning a freshly allocated CLOSID
+ * may not be able to allocate clean RMID. To avoid this the allocator will
+ * choose the CLOSID with the most clean RMID.
+ *
+ * When the CLOSID and RMID are independent numbers, the first free CLOSID will
+ * be returned.
+ */
+int resctrl_find_cleanest_closid(void)
+{
+ u32 cleanest_closid = ~0;
+ int i = 0;
+
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ if (!IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+ return -EIO;
+
+ for (i = 0; i < closids_supported(); i++) {
+ int num_dirty;
+
+ if (closid_allocated(i))
+ continue;
+
+ num_dirty = closid_num_dirty_rmid[i];
+ if (num_dirty == 0)
+ return i;
+
+ if (cleanest_closid == ~0)
+ cleanest_closid = i;
+
+ if (num_dirty < closid_num_dirty_rmid[cleanest_closid])
+ cleanest_closid = i;
+ }
+
+ if (cleanest_closid == ~0)
+ return -ENOSPC;
+
+ return cleanest_closid;
+}
+
+/*
+ * For MPAM the RMID value is not unique, and has to be considered with
+ * the CLOSID. The (CLOSID, RMID) pair is allocated on all domains, which
+ * allows all domains to be managed by a single free list.
+ * Each domain also has a rmid_busy_llc to reduce the work of the limbo handler.
+ */
+int alloc_rmid(u32 closid)
+{
+ struct rmid_entry *entry;
+
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ entry = resctrl_find_free_rmid(closid);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
+
+ list_del(&entry->list);
+ return entry->rmid;
+}
+
+static void add_rmid_to_limbo(struct rmid_entry *entry)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+ struct rdt_domain *d;
+ u32 idx;
+
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
+
+ idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
+
+ entry->busy = 0;
+ list_for_each_entry(d, &r->domains, list) {
+ /*
+ * For the first limbo RMID in the domain,
+ * setup up the limbo worker.
+ */
+ if (!has_busy_rmid(d))
+ cqm_setup_limbo_handler(d, CQM_LIMBOCHECK_INTERVAL,
+ RESCTRL_PICK_ANY_CPU);
+ set_bit(idx, d->rmid_busy_llc);
+ entry->busy++;
+ }
+
+ rmid_limbo_count++;
+ if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+ closid_num_dirty_rmid[entry->closid]++;
+}
+
+void free_rmid(u32 closid, u32 rmid)
+{
+ u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+ struct rmid_entry *entry;
+
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ /*
+ * Do not allow the default rmid to be free'd. Comparing by index
+ * allows architectures that ignore the closid parameter to avoid an
+ * unnecessary check.
+ */
+ if (idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+ RESCTRL_RESERVED_RMID))
+ return;
+
+ entry = __rmid_entry(idx);
+
+ if (resctrl_arch_is_llc_occupancy_enabled())
+ add_rmid_to_limbo(entry);
+ else
+ list_add_tail(&entry->list, &rmid_free_lru);
+}
+
+static struct mbm_state *get_mbm_state(struct rdt_domain *d, u32 closid,
+ u32 rmid, enum resctrl_event_id evtid)
+{
+ u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+
+ switch (evtid) {
+ case QOS_L3_MBM_TOTAL_EVENT_ID:
+ return &d->mbm_total[idx];
+ case QOS_L3_MBM_LOCAL_EVENT_ID:
+ return &d->mbm_local[idx];
+ default:
+ return NULL;
+ }
+}
+
+static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
+{
+ struct mbm_state *m;
+ u64 tval = 0;
+
+ if (rr->first) {
+ resctrl_arch_reset_rmid(rr->r, rr->d, closid, rmid, rr->evtid);
+ m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
+ if (m)
+ memset(m, 0, sizeof(struct mbm_state));
+ return 0;
+ }
+
+ rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid, rr->evtid,
+ &tval, rr->arch_mon_ctx);
+ if (rr->err)
+ return rr->err;
+
+ rr->val += tval;
+
+ return 0;
+}
+
+/*
+ * mbm_bw_count() - Update bw count from values previously read by
+ * __mon_event_count().
+ * @closid: The closid used to identify the cached mbm_state.
+ * @rmid: The rmid used to identify the cached mbm_state.
+ * @rr: The struct rmid_read populated by __mon_event_count().
+ *
+ * Supporting function to calculate the memory bandwidth
+ * and delta bandwidth in MBps. The chunks value previously read by
+ * __mon_event_count() is compared with the chunks value from the previous
+ * invocation. This must be called once per second to maintain values in MBps.
+ */
+static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
+{
+ u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+ struct mbm_state *m = &rr->d->mbm_local[idx];
+ u64 cur_bw, bytes, cur_bytes;
+
+ cur_bytes = rr->val;
+ bytes = cur_bytes - m->prev_bw_bytes;
+ m->prev_bw_bytes = cur_bytes;
+
+ cur_bw = bytes / SZ_1M;
+
+ m->prev_bw = cur_bw;
+}
+
+/*
+ * This is scheduled by mon_event_read() to read the CQM/MBM counters
+ * on a domain.
+ */
+void mon_event_count(void *info)
+{
+ struct rdtgroup *rdtgrp, *entry;
+ struct rmid_read *rr = info;
+ struct list_head *head;
+ int ret;
+
+ rdtgrp = rr->rgrp;
+
+ ret = __mon_event_count(rdtgrp->closid, rdtgrp->mon.rmid, rr);
+
+ /*
+ * For Ctrl groups read data from child monitor groups and
+ * add them together. Count events which are read successfully.
+ * Discard the rmid_read's reporting errors.
+ */
+ head = &rdtgrp->mon.crdtgrp_list;
+
+ if (rdtgrp->type == RDTCTRL_GROUP) {
+ list_for_each_entry(entry, head, mon.crdtgrp_list) {
+ if (__mon_event_count(entry->closid, entry->mon.rmid,
+ rr) == 0)
+ ret = 0;
+ }
+ }
+
+ /*
+ * __mon_event_count() calls for newly created monitor groups may
+ * report -EINVAL/Unavailable if the monitor hasn't seen any traffic.
+ * Discard error if any of the monitor event reads succeeded.
+ */
+ if (ret == 0)
+ rr->err = 0;
+}
+
+/*
+ * Feedback loop for MBA software controller (mba_sc)
+ *
+ * mba_sc is a feedback loop where we periodically read MBM counters and
+ * adjust the bandwidth percentage values via the IA32_MBA_THRTL_MSRs so
+ * that:
+ *
+ * current bandwidth(cur_bw) < user specified bandwidth(user_bw)
+ *
+ * This uses the MBM counters to measure the bandwidth and MBA throttle
+ * MSRs to control the bandwidth for a particular rdtgrp. It builds on the
+ * fact that resctrl rdtgroups have both monitoring and control.
+ *
+ * The frequency of the checks is 1s and we just tag along the MBM overflow
+ * timer. Having 1s interval makes the calculation of bandwidth simpler.
+ *
+ * Although MBA's goal is to restrict the bandwidth to a maximum, there may
+ * be a need to increase the bandwidth to avoid unnecessarily restricting
+ * the L2 <-> L3 traffic.
+ *
+ * Since MBA controls the L2 external bandwidth where as MBM measures the
+ * L3 external bandwidth the following sequence could lead to such a
+ * situation.
+ *
+ * Consider an rdtgroup which had high L3 <-> memory traffic in initial
+ * phases -> mba_sc kicks in and reduced bandwidth percentage values -> but
+ * after some time rdtgroup has mostly L2 <-> L3 traffic.
+ *
+ * In this case we may restrict the rdtgroup's L2 <-> L3 traffic as its
+ * throttle MSRs already have low percentage values. To avoid
+ * unnecessarily restricting such rdtgroups, we also increase the bandwidth.
+ */
+static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
+{
+ u32 closid, rmid, cur_msr_val, new_msr_val;
+ struct mbm_state *pmbm_data, *cmbm_data;
+ struct rdt_resource *r_mba;
+ struct rdt_domain *dom_mba;
+ u32 cur_bw, user_bw, idx;
+ struct list_head *head;
+ struct rdtgroup *entry;
+
+ if (!resctrl_arch_is_mbm_local_enabled())
+ return;
+
+ r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+ closid = rgrp->closid;
+ rmid = rgrp->mon.rmid;
+ idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+ pmbm_data = &dom_mbm->mbm_local[idx];
+
+ dom_mba = resctrl_get_domain_from_cpu(smp_processor_id(), r_mba);
+ if (!dom_mba) {
+ pr_warn_once("Failure to get domain for MBA update\n");
+ return;
+ }
+
+ cur_bw = pmbm_data->prev_bw;
+ user_bw = dom_mba->mbps_val[closid];
+
+ /* MBA resource doesn't support CDP */
+ cur_msr_val = resctrl_arch_get_config(r_mba, dom_mba, closid, CDP_NONE);
+
+ /*
+ * For Ctrl groups read data from child monitor groups.
+ */
+ head = &rgrp->mon.crdtgrp_list;
+ list_for_each_entry(entry, head, mon.crdtgrp_list) {
+ cmbm_data = &dom_mbm->mbm_local[entry->mon.rmid];
+ cur_bw += cmbm_data->prev_bw;
+ }
+
+ /*
+ * Scale up/down the bandwidth linearly for the ctrl group. The
+ * bandwidth step is the bandwidth granularity specified by the
+ * hardware.
+ * Always increase throttling if current bandwidth is above the
+ * target set by user.
+ * But avoid thrashing up and down on every poll by checking
+ * whether a decrease in throttling is likely to push the group
+ * back over target. E.g. if currently throttling to 30% of bandwidth
+ * on a system with 10% granularity steps, check whether moving to
+ * 40% would go past the limit by multiplying current bandwidth by
+ * "(30 + 10) / 30".
+ */
+ if (cur_msr_val > r_mba->membw.min_bw && user_bw < cur_bw) {
+ new_msr_val = cur_msr_val - r_mba->membw.bw_gran;
+ } else if (cur_msr_val < MAX_MBA_BW &&
+ (user_bw > (cur_bw * (cur_msr_val + r_mba->membw.min_bw) / cur_msr_val))) {
+ new_msr_val = cur_msr_val + r_mba->membw.bw_gran;
+ } else {
+ return;
+ }
+
+ resctrl_arch_update_one(r_mba, dom_mba, closid, CDP_NONE, new_msr_val);
+}
+
+static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
+ u32 closid, u32 rmid)
+{
+ struct rmid_read rr;
+
+ rr.first = false;
+ rr.r = r;
+ rr.d = d;
+
+ /*
+ * This is protected from concurrent reads from user
+ * as both the user and we hold the global mutex.
+ */
+ if (resctrl_arch_is_mbm_total_enabled()) {
+ rr.evtid = QOS_L3_MBM_TOTAL_EVENT_ID;
+ rr.val = 0;
+ rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
+ if (IS_ERR(rr.arch_mon_ctx)) {
+ pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+ PTR_ERR(rr.arch_mon_ctx));
+ return;
+ }
+
+ __mon_event_count(closid, rmid, &rr);
+
+ resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
+ }
+ if (resctrl_arch_is_mbm_local_enabled()) {
+ rr.evtid = QOS_L3_MBM_LOCAL_EVENT_ID;
+ rr.val = 0;
+ rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
+ if (IS_ERR(rr.arch_mon_ctx)) {
+ pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+ PTR_ERR(rr.arch_mon_ctx));
+ return;
+ }
+
+ __mon_event_count(closid, rmid, &rr);
+
+ /*
+ * Call the MBA software controller only for the
+ * control groups and when user has enabled
+ * the software controller explicitly.
+ */
+ if (is_mba_sc(NULL))
+ mbm_bw_count(closid, rmid, &rr);
+
+ resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
+ }
+}
+
+/*
+ * Handler to scan the limbo list and move the RMIDs
+ * to free list whose occupancy < threshold_occupancy.
+ */
+void cqm_handle_limbo(struct work_struct *work)
+{
+ unsigned long delay = msecs_to_jiffies(CQM_LIMBOCHECK_INTERVAL);
+ struct rdt_domain *d;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ d = container_of(work, struct rdt_domain, cqm_limbo.work);
+
+ __check_limbo(d, false);
+
+ if (has_busy_rmid(d)) {
+ d->cqm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
+ RESCTRL_PICK_ANY_CPU);
+ schedule_delayed_work_on(d->cqm_work_cpu, &d->cqm_limbo,
+ delay);
+ }
+
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+}
+
+/**
+ * cqm_setup_limbo_handler() - Schedule the limbo handler to run for this
+ * domain.
+ * @dom: The domain the limbo handler should run for.
+ * @delay_ms: How far in the future the handler should run.
+ * @exclude_cpu: Which CPU the handler should not run on,
+ * RESCTRL_PICK_ANY_CPU to pick any CPU.
+ */
+void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
+ int exclude_cpu)
+{
+ unsigned long delay = msecs_to_jiffies(delay_ms);
+ int cpu;
+
+ cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
+ dom->cqm_work_cpu = cpu;
+
+ if (cpu < nr_cpu_ids)
+ schedule_delayed_work_on(cpu, &dom->cqm_limbo, delay);
+}
+
+void mbm_handle_overflow(struct work_struct *work)
+{
+ unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
+ struct rdtgroup *prgrp, *crgrp;
+ struct list_head *head;
+ struct rdt_resource *r;
+ struct rdt_domain *d;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ /*
+ * If the filesystem has been unmounted this work no longer needs to
+ * run.
+ */
+ if (!resctrl_mounted || !resctrl_arch_mon_capable())
+ goto out_unlock;
+
+ r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+ d = container_of(work, struct rdt_domain, mbm_over.work);
+
+ list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+ mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
+
+ head = &prgrp->mon.crdtgrp_list;
+ list_for_each_entry(crgrp, head, mon.crdtgrp_list)
+ mbm_update(r, d, crgrp->closid, crgrp->mon.rmid);
+
+ if (is_mba_sc(NULL))
+ update_mba_bw(prgrp, d);
+ }
+
+ /*
+ * Re-check for housekeeping CPUs. This allows the overflow handler to
+ * move off a nohz_full CPU quickly.
+ */
+ d->mbm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
+ RESCTRL_PICK_ANY_CPU);
+ schedule_delayed_work_on(d->mbm_work_cpu, &d->mbm_over, delay);
+
+out_unlock:
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+}
+
+/**
+ * mbm_setup_overflow_handler() - Schedule the overflow handler to run for this
+ * domain.
+ * @dom: The domain the overflow handler should run for.
+ * @delay_ms: How far in the future the handler should run.
+ * @exclude_cpu: Which CPU the handler should not run on,
+ * RESCTRL_PICK_ANY_CPU to pick any CPU.
+ */
+void mbm_setup_overflow_handler(struct rdt_domain *dom, unsigned long delay_ms,
+ int exclude_cpu)
+{
+ unsigned long delay = msecs_to_jiffies(delay_ms);
+ int cpu;
+
+ /*
+ * When a domain comes online there is no guarantee the filesystem is
+ * mounted. If not, there is no need to catch counter overflow.
+ */
+ if (!resctrl_mounted || !resctrl_arch_mon_capable())
+ return;
+ cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
+ dom->mbm_work_cpu = cpu;
+
+ if (cpu < nr_cpu_ids)
+ schedule_delayed_work_on(cpu, &dom->mbm_over, delay);
+}
+
+static int dom_data_init(struct rdt_resource *r)
+{
+ u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+ u32 num_closid = resctrl_arch_get_num_closid(r);
+ struct rmid_entry *entry = NULL;
+ int err = 0, i;
+ u32 idx;
+
+ mutex_lock(&rdtgroup_mutex);
+ if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+ u32 *tmp;
+
+ /*
+ * If the architecture hasn't provided a sanitised value here,
+ * this may result in larger arrays than necessary. Resctrl will
+ * use a smaller system wide value based on the resources in
+ * use.
+ */
+ tmp = kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL);
+ if (!tmp) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+
+ closid_num_dirty_rmid = tmp;
+ }
+
+ rmid_ptrs = kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL);
+ if (!rmid_ptrs) {
+ if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+ kfree(closid_num_dirty_rmid);
+ closid_num_dirty_rmid = NULL;
+ }
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+
+ for (i = 0; i < idx_limit; i++) {
+ entry = &rmid_ptrs[i];
+ INIT_LIST_HEAD(&entry->list);
+
+ resctrl_arch_rmid_idx_decode(i, &entry->closid, &entry->rmid);
+ list_add_tail(&entry->list, &rmid_free_lru);
+ }
+
+ /*
+ * RESCTRL_RESERVED_CLOSID and RESCTRL_RESERVED_RMID are special and
+ * are always allocated. These are used for the rdtgroup_default
+ * control group, which will be setup later in resctrl_init().
+ */
+ idx = resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+ RESCTRL_RESERVED_RMID);
+ entry = __rmid_entry(idx);
+ list_del(&entry->list);
+
+out_unlock:
+ mutex_unlock(&rdtgroup_mutex);
+
+ return err;
+}
+
+static void dom_data_exit(struct rdt_resource *r)
+{
+ if (!r->mon_capable)
+ return;
+
+ mutex_lock(&rdtgroup_mutex);
+ if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+ kfree(closid_num_dirty_rmid);
+ closid_num_dirty_rmid = NULL;
+ }
+
+ kfree(rmid_ptrs);
+ rmid_ptrs = NULL;
+
+ mutex_unlock(&rdtgroup_mutex);
+}
+
+static struct mon_evt llc_occupancy_event = {
+ .name = "llc_occupancy",
+ .evtid = QOS_L3_OCCUP_EVENT_ID,
+};
+
+static struct mon_evt mbm_total_event = {
+ .name = "mbm_total_bytes",
+ .evtid = QOS_L3_MBM_TOTAL_EVENT_ID,
+};
+
+static struct mon_evt mbm_local_event = {
+ .name = "mbm_local_bytes",
+ .evtid = QOS_L3_MBM_LOCAL_EVENT_ID,
+};
+
+/*
+ * Initialize the event list for the resource.
+ *
+ * Note that MBM events are also part of RDT_RESOURCE_L3 resource
+ * because as per the SDM the total and local memory bandwidth
+ * are enumerated as part of L3 monitoring.
+ */
+static void l3_mon_evt_init(struct rdt_resource *r)
+{
+ INIT_LIST_HEAD(&r->evt_list);
+
+ if (resctrl_arch_is_llc_occupancy_enabled())
+ list_add_tail(&llc_occupancy_event.list, &r->evt_list);
+ if (resctrl_arch_is_mbm_total_enabled())
+ list_add_tail(&mbm_total_event.list, &r->evt_list);
+ if (resctrl_arch_is_mbm_local_enabled())
+ list_add_tail(&mbm_local_event.list, &r->evt_list);
+}
+
+int resctrl_mon_resource_init(void)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+ int ret;
+
+ if (!r->mon_capable)
+ return 0;
+
+ ret = dom_data_init(r);
+ if (ret)
+ return ret;
+
+ l3_mon_evt_init(r);
+
+ if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
+ mbm_total_event.configurable = true;
+ mbm_config_rftype_init("mbm_total_bytes_config");
+ }
+ if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
+ mbm_local_event.configurable = true;
+ mbm_config_rftype_init("mbm_local_bytes_config");
+ }
+
+ return 0;
+}
+
+void resctrl_mon_resource_exit(void)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+
+ dom_data_exit(r);
+}
diff --git a/fs/resctrl/pseudo_lock.c b/fs/resctrl/pseudo_lock.c
index e69de29bb2d1..077c2abb6edd 100644
--- a/fs/resctrl/pseudo_lock.c
+++ b/fs/resctrl/pseudo_lock.c
@@ -0,0 +1,1122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Resource Director Technology (RDT)
+ *
+ * Pseudo-locking support built on top of Cache Allocation Technology (CAT)
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Author: Reinette Chatre <reinette.chatre@...el.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cacheinfo.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/debugfs.h>
+#include <linux/kthread.h>
+#include <linux/mman.h>
+#include <linux/perf_event.h>
+#include <linux/pm_qos.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include <asm/cacheflush.h>
+#include <asm/resctrl.h>
+#include <asm/perf_event.h>
+
+#include "internal.h"
+
+/*
+ * Major number assigned to and shared by all devices exposing
+ * pseudo-locked regions.
+ */
+static unsigned int pseudo_lock_major;
+static unsigned long pseudo_lock_minor_avail = GENMASK(MINORBITS, 0);
+
+static char *pseudo_lock_devnode(const struct device *dev, umode_t *mode)
+{
+ const struct rdtgroup *rdtgrp;
+
+ rdtgrp = dev_get_drvdata(dev);
+ if (mode)
+ *mode = 0600;
+ return kasprintf(GFP_KERNEL, "pseudo_lock/%s", rdtgrp->kn->name);
+}
+
+static const struct class pseudo_lock_class = {
+ .name = "pseudo_lock",
+ .devnode = pseudo_lock_devnode,
+};
+
+/**
+ * pseudo_lock_minor_get - Obtain available minor number
+ * @minor: Pointer to where new minor number will be stored
+ *
+ * A bitmask is used to track available minor numbers. Here the next free
+ * minor number is marked as unavailable and returned.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int pseudo_lock_minor_get(unsigned int *minor)
+{
+ unsigned long first_bit;
+
+ first_bit = find_first_bit(&pseudo_lock_minor_avail, MINORBITS);
+
+ if (first_bit == MINORBITS)
+ return -ENOSPC;
+
+ __clear_bit(first_bit, &pseudo_lock_minor_avail);
+ *minor = first_bit;
+
+ return 0;
+}
+
+/**
+ * pseudo_lock_minor_release - Return minor number to available
+ * @minor: The minor number made available
+ */
+static void pseudo_lock_minor_release(unsigned int minor)
+{
+ __set_bit(minor, &pseudo_lock_minor_avail);
+}
+
+/**
+ * region_find_by_minor - Locate a pseudo-lock region by inode minor number
+ * @minor: The minor number of the device representing pseudo-locked region
+ *
+ * When the character device is accessed we need to determine which
+ * pseudo-locked region it belongs to. This is done by matching the minor
+ * number of the device to the pseudo-locked region it belongs.
+ *
+ * Minor numbers are assigned at the time a pseudo-locked region is associated
+ * with a cache instance.
+ *
+ * Return: On success return pointer to resource group owning the pseudo-locked
+ * region, NULL on failure.
+ */
+static struct rdtgroup *region_find_by_minor(unsigned int minor)
+{
+ struct rdtgroup *rdtgrp, *rdtgrp_match = NULL;
+
+ list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+ if (rdtgrp->plr && rdtgrp->plr->minor == minor) {
+ rdtgrp_match = rdtgrp;
+ break;
+ }
+ }
+ return rdtgrp_match;
+}
+
+/**
+ * struct pseudo_lock_pm_req - A power management QoS request list entry
+ * @list: Entry within the @pm_reqs list for a pseudo-locked region
+ * @req: PM QoS request
+ */
+struct pseudo_lock_pm_req {
+ struct list_head list;
+ struct dev_pm_qos_request req;
+};
+
+static void pseudo_lock_cstates_relax(struct pseudo_lock_region *plr)
+{
+ struct pseudo_lock_pm_req *pm_req, *next;
+
+ list_for_each_entry_safe(pm_req, next, &plr->pm_reqs, list) {
+ dev_pm_qos_remove_request(&pm_req->req);
+ list_del(&pm_req->list);
+ kfree(pm_req);
+ }
+}
+
+/**
+ * pseudo_lock_cstates_constrain - Restrict cores from entering C6
+ * @plr: Pseudo-locked region
+ *
+ * To prevent the cache from being affected by power management entering
+ * C6 has to be avoided. This is accomplished by requesting a latency
+ * requirement lower than lowest C6 exit latency of all supported
+ * platforms as found in the cpuidle state tables in the intel_idle driver.
+ * At this time it is possible to do so with a single latency requirement
+ * for all supported platforms.
+ *
+ * Since Goldmont is supported, which is affected by X86_BUG_MONITOR,
+ * the ACPI latencies need to be considered while keeping in mind that C2
+ * may be set to map to deeper sleep states. In this case the latency
+ * requirement needs to prevent entering C2 also.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_cstates_constrain(struct pseudo_lock_region *plr)
+{
+ struct pseudo_lock_pm_req *pm_req;
+ int cpu;
+ int ret;
+
+ for_each_cpu(cpu, &plr->d->cpu_mask) {
+ pm_req = kzalloc(sizeof(*pm_req), GFP_KERNEL);
+ if (!pm_req) {
+ rdt_last_cmd_puts("Failure to allocate memory for PM QoS\n");
+ ret = -ENOMEM;
+ goto out_err;
+ }
+ ret = dev_pm_qos_add_request(get_cpu_device(cpu),
+ &pm_req->req,
+ DEV_PM_QOS_RESUME_LATENCY,
+ 30);
+ if (ret < 0) {
+ rdt_last_cmd_printf("Failed to add latency req CPU%d\n",
+ cpu);
+ kfree(pm_req);
+ ret = -1;
+ goto out_err;
+ }
+ list_add(&pm_req->list, &plr->pm_reqs);
+ }
+
+ return 0;
+
+out_err:
+ pseudo_lock_cstates_relax(plr);
+ return ret;
+}
+
+/**
+ * pseudo_lock_region_clear - Reset pseudo-lock region data
+ * @plr: pseudo-lock region
+ *
+ * All content of the pseudo-locked region is reset - any memory allocated
+ * freed.
+ *
+ * Return: void
+ */
+static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
+{
+ plr->size = 0;
+ plr->line_size = 0;
+ kfree(plr->kmem);
+ plr->kmem = NULL;
+ plr->s = NULL;
+ if (plr->d)
+ plr->d->plr = NULL;
+ plr->d = NULL;
+ plr->cbm = 0;
+ plr->debugfs_dir = NULL;
+}
+
+/**
+ * pseudo_lock_region_init - Initialize pseudo-lock region information
+ * @plr: pseudo-lock region
+ *
+ * Called after user provided a schemata to be pseudo-locked. From the
+ * schemata the &struct pseudo_lock_region is on entry already initialized
+ * with the resource, domain, and capacity bitmask. Here the information
+ * required for pseudo-locking is deduced from this data and &struct
+ * pseudo_lock_region initialized further. This information includes:
+ * - size in bytes of the region to be pseudo-locked
+ * - cache line size to know the stride with which data needs to be accessed
+ * to be pseudo-locked
+ * - a cpu associated with the cache instance on which the pseudo-locking
+ * flow can be executed
+ *
+ * Return: 0 on success, <0 on failure. Descriptive error will be written
+ * to last_cmd_status buffer.
+ */
+static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
+{
+ struct cpu_cacheinfo *ci;
+ int ret;
+ int i;
+
+ /* Pick the first cpu we find that is associated with the cache. */
+ plr->cpu = cpumask_first(&plr->d->cpu_mask);
+
+ if (!cpu_online(plr->cpu)) {
+ rdt_last_cmd_printf("CPU %u associated with cache not online\n",
+ plr->cpu);
+ ret = -ENODEV;
+ goto out_region;
+ }
+
+ ci = get_cpu_cacheinfo(plr->cpu);
+
+ plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
+
+ for (i = 0; i < ci->num_leaves; i++) {
+ if (ci->info_list[i].level == plr->s->res->cache_level) {
+ plr->line_size = ci->info_list[i].coherency_line_size;
+ return 0;
+ }
+ }
+
+ ret = -1;
+ rdt_last_cmd_puts("Unable to determine cache line size\n");
+out_region:
+ pseudo_lock_region_clear(plr);
+ return ret;
+}
+
+/**
+ * pseudo_lock_init - Initialize a pseudo-lock region
+ * @rdtgrp: resource group to which new pseudo-locked region will belong
+ *
+ * A pseudo-locked region is associated with a resource group. When this
+ * association is created the pseudo-locked region is initialized. The
+ * details of the pseudo-locked region are not known at this time so only
+ * allocation is done and association established.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_init(struct rdtgroup *rdtgrp)
+{
+ struct pseudo_lock_region *plr;
+
+ plr = kzalloc(sizeof(*plr), GFP_KERNEL);
+ if (!plr)
+ return -ENOMEM;
+
+ init_waitqueue_head(&plr->lock_thread_wq);
+ INIT_LIST_HEAD(&plr->pm_reqs);
+ rdtgrp->plr = plr;
+ return 0;
+}
+
+/**
+ * pseudo_lock_region_alloc - Allocate kernel memory that will be pseudo-locked
+ * @plr: pseudo-lock region
+ *
+ * Initialize the details required to set up the pseudo-locked region and
+ * allocate the contiguous memory that will be pseudo-locked to the cache.
+ *
+ * Return: 0 on success, <0 on failure. Descriptive error will be written
+ * to last_cmd_status buffer.
+ */
+static int pseudo_lock_region_alloc(struct pseudo_lock_region *plr)
+{
+ int ret;
+
+ ret = pseudo_lock_region_init(plr);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * We do not yet support contiguous regions larger than
+ * KMALLOC_MAX_SIZE.
+ */
+ if (plr->size > KMALLOC_MAX_SIZE) {
+ rdt_last_cmd_puts("Requested region exceeds maximum size\n");
+ ret = -E2BIG;
+ goto out_region;
+ }
+
+ plr->kmem = kzalloc(plr->size, GFP_KERNEL);
+ if (!plr->kmem) {
+ rdt_last_cmd_puts("Unable to allocate memory\n");
+ ret = -ENOMEM;
+ goto out_region;
+ }
+
+ ret = 0;
+ goto out;
+out_region:
+ pseudo_lock_region_clear(plr);
+out:
+ return ret;
+}
+
+/**
+ * pseudo_lock_free - Free a pseudo-locked region
+ * @rdtgrp: resource group to which pseudo-locked region belonged
+ *
+ * The pseudo-locked region's resources have already been released, or not
+ * yet created at this point. Now it can be freed and disassociated from the
+ * resource group.
+ *
+ * Return: void
+ */
+static void pseudo_lock_free(struct rdtgroup *rdtgrp)
+{
+ pseudo_lock_region_clear(rdtgrp->plr);
+ kfree(rdtgrp->plr);
+ rdtgrp->plr = NULL;
+}
+
+/**
+ * rdtgroup_monitor_in_progress - Test if monitoring in progress
+ * @rdtgrp: resource group being queried
+ *
+ * Return: 1 if monitor groups have been created for this resource
+ * group, 0 otherwise.
+ */
+static int rdtgroup_monitor_in_progress(struct rdtgroup *rdtgrp)
+{
+ return !list_empty(&rdtgrp->mon.crdtgrp_list);
+}
+
+/**
+ * rdtgroup_locksetup_user_restrict - Restrict user access to group
+ * @rdtgrp: resource group needing access restricted
+ *
+ * A resource group used for cache pseudo-locking cannot have cpus or tasks
+ * assigned to it. This is communicated to the user by restricting access
+ * to all the files that can be used to make such changes.
+ *
+ * Permissions restored with rdtgroup_locksetup_user_restore()
+ *
+ * Return: 0 on success, <0 on failure. If a failure occurs during the
+ * restriction of access an attempt will be made to restore permissions but
+ * the state of the mode of these files will be uncertain when a failure
+ * occurs.
+ */
+static int rdtgroup_locksetup_user_restrict(struct rdtgroup *rdtgrp)
+{
+ int ret;
+
+ ret = rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
+ if (ret)
+ return ret;
+
+ ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
+ if (ret)
+ goto err_tasks;
+
+ ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
+ if (ret)
+ goto err_cpus;
+
+ if (resctrl_arch_mon_capable()) {
+ ret = rdtgroup_kn_mode_restrict(rdtgrp, "mon_groups");
+ if (ret)
+ goto err_cpus_list;
+ }
+
+ ret = 0;
+ goto out;
+
+err_cpus_list:
+ rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
+err_cpus:
+ rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
+err_tasks:
+ rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
+out:
+ return ret;
+}
+
+/**
+ * rdtgroup_locksetup_user_restore - Restore user access to group
+ * @rdtgrp: resource group needing access restored
+ *
+ * Restore all file access previously removed using
+ * rdtgroup_locksetup_user_restrict()
+ *
+ * Return: 0 on success, <0 on failure. If a failure occurs during the
+ * restoration of access an attempt will be made to restrict permissions
+ * again but the state of the mode of these files will be uncertain when
+ * a failure occurs.
+ */
+static int rdtgroup_locksetup_user_restore(struct rdtgroup *rdtgrp)
+{
+ int ret;
+
+ ret = rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
+ if (ret)
+ return ret;
+
+ ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
+ if (ret)
+ goto err_tasks;
+
+ ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
+ if (ret)
+ goto err_cpus;
+
+ if (resctrl_arch_mon_capable()) {
+ ret = rdtgroup_kn_mode_restore(rdtgrp, "mon_groups", 0777);
+ if (ret)
+ goto err_cpus_list;
+ }
+
+ ret = 0;
+ goto out;
+
+err_cpus_list:
+ rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
+err_cpus:
+ rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
+err_tasks:
+ rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
+out:
+ return ret;
+}
+
+/**
+ * rdtgroup_locksetup_enter - Resource group enters locksetup mode
+ * @rdtgrp: resource group requested to enter locksetup mode
+ *
+ * A resource group enters locksetup mode to reflect that it would be used
+ * to represent a pseudo-locked region and is in the process of being set
+ * up to do so. A resource group used for a pseudo-locked region would
+ * lose the closid associated with it so we cannot allow it to have any
+ * tasks or cpus assigned nor permit tasks or cpus to be assigned in the
+ * future. Monitoring of a pseudo-locked region is not allowed either.
+ *
+ * The above and more restrictions on a pseudo-locked region are checked
+ * for and enforced before the resource group enters the locksetup mode.
+ *
+ * Returns: 0 if the resource group successfully entered locksetup mode, <0
+ * on failure. On failure the last_cmd_status buffer is updated with text to
+ * communicate details of failure to the user.
+ */
+int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
+{
+ int ret;
+
+ /*
+ * The default resource group can neither be removed nor lose the
+ * default closid associated with it.
+ */
+ if (rdtgrp == &rdtgroup_default) {
+ rdt_last_cmd_puts("Cannot pseudo-lock default group\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Cache Pseudo-locking not supported when CDP is enabled.
+ *
+ * Some things to consider if you would like to enable this
+ * support (using L3 CDP as example):
+ * - When CDP is enabled two separate resources are exposed,
+ * L3DATA and L3CODE, but they are actually on the same cache.
+ * The implication for pseudo-locking is that if a
+ * pseudo-locked region is created on a domain of one
+ * resource (eg. L3CODE), then a pseudo-locked region cannot
+ * be created on that same domain of the other resource
+ * (eg. L3DATA). This is because the creation of a
+ * pseudo-locked region involves a call to wbinvd that will
+ * affect all cache allocations on particular domain.
+ * - Considering the previous, it may be possible to only
+ * expose one of the CDP resources to pseudo-locking and
+ * hide the other. For example, we could consider to only
+ * expose L3DATA and since the L3 cache is unified it is
+ * still possible to place instructions there are execute it.
+ * - If only one region is exposed to pseudo-locking we should
+ * still keep in mind that availability of a portion of cache
+ * for pseudo-locking should take into account both resources.
+ * Similarly, if a pseudo-locked region is created in one
+ * resource, the portion of cache used by it should be made
+ * unavailable to all future allocations from both resources.
+ */
+ if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3) ||
+ resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) {
+ rdt_last_cmd_puts("CDP enabled\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Not knowing the bits to disable prefetching implies that this
+ * platform does not support Cache Pseudo-Locking.
+ */
+ if (resctrl_arch_get_prefetch_disable_bits() == 0) {
+ rdt_last_cmd_puts("Pseudo-locking not supported\n");
+ return -EINVAL;
+ }
+
+ if (rdtgroup_monitor_in_progress(rdtgrp)) {
+ rdt_last_cmd_puts("Monitoring in progress\n");
+ return -EINVAL;
+ }
+
+ if (rdtgroup_tasks_assigned(rdtgrp)) {
+ rdt_last_cmd_puts("Tasks assigned to resource group\n");
+ return -EINVAL;
+ }
+
+ if (!cpumask_empty(&rdtgrp->cpu_mask)) {
+ rdt_last_cmd_puts("CPUs assigned to resource group\n");
+ return -EINVAL;
+ }
+
+ if (rdtgroup_locksetup_user_restrict(rdtgrp)) {
+ rdt_last_cmd_puts("Unable to modify resctrl permissions\n");
+ return -EIO;
+ }
+
+ ret = pseudo_lock_init(rdtgrp);
+ if (ret) {
+ rdt_last_cmd_puts("Unable to init pseudo-lock region\n");
+ goto out_release;
+ }
+
+ /*
+ * If this system is capable of monitoring a rmid would have been
+ * allocated when the control group was created. This is not needed
+ * anymore when this group would be used for pseudo-locking. This
+ * is safe to call on platforms not capable of monitoring.
+ */
+ free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+ ret = 0;
+ goto out;
+
+out_release:
+ rdtgroup_locksetup_user_restore(rdtgrp);
+out:
+ return ret;
+}
+
+/**
+ * rdtgroup_locksetup_exit - resource group exist locksetup mode
+ * @rdtgrp: resource group
+ *
+ * When a resource group exits locksetup mode the earlier restrictions are
+ * lifted.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
+{
+ int ret;
+
+ if (resctrl_arch_mon_capable()) {
+ ret = alloc_rmid(rdtgrp->closid);
+ if (ret < 0) {
+ rdt_last_cmd_puts("Out of RMIDs\n");
+ return ret;
+ }
+ rdtgrp->mon.rmid = ret;
+ }
+
+ ret = rdtgroup_locksetup_user_restore(rdtgrp);
+ if (ret) {
+ free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+ return ret;
+ }
+
+ pseudo_lock_free(rdtgrp);
+ return 0;
+}
+
+/**
+ * rdtgroup_cbm_overlaps_pseudo_locked - Test if CBM or portion is pseudo-locked
+ * @d: RDT domain
+ * @cbm: CBM to test
+ *
+ * @d represents a cache instance and @cbm a capacity bitmask that is
+ * considered for it. Determine if @cbm overlaps with any existing
+ * pseudo-locked region on @d.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used, to make the
+ * bitmap functions work correctly.
+ *
+ * Return: true if @cbm overlaps with pseudo-locked region on @d, false
+ * otherwise.
+ */
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
+{
+ unsigned int cbm_len;
+ unsigned long cbm_b;
+
+ if (d->plr) {
+ cbm_len = d->plr->s->res->cache.cbm_len;
+ cbm_b = d->plr->cbm;
+ if (bitmap_intersects(&cbm, &cbm_b, cbm_len))
+ return true;
+ }
+ return false;
+}
+
+/**
+ * rdtgroup_pseudo_locked_in_hierarchy - Pseudo-locked region in cache hierarchy
+ * @d: RDT domain under test
+ *
+ * The setup of a pseudo-locked region affects all cache instances within
+ * the hierarchy of the region. It is thus essential to know if any
+ * pseudo-locked regions exist within a cache hierarchy to prevent any
+ * attempts to create new pseudo-locked regions in the same hierarchy.
+ *
+ * Return: true if a pseudo-locked region exists in the hierarchy of @d or
+ * if it is not possible to test due to memory allocation issue,
+ * false otherwise.
+ */
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
+{
+ cpumask_var_t cpu_with_psl;
+ enum resctrl_res_level i;
+ struct rdt_resource *r;
+ struct rdt_domain *d_i;
+ bool ret = false;
+
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
+
+ if (!zalloc_cpumask_var(&cpu_with_psl, GFP_KERNEL))
+ return true;
+
+ /*
+ * First determine which cpus have pseudo-locked regions
+ * associated with them.
+ */
+ for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+ r = resctrl_arch_get_resource(i);
+ if (!r->alloc_capable)
+ continue;
+
+ list_for_each_entry(d_i, &r->domains, list) {
+ if (d_i->plr)
+ cpumask_or(cpu_with_psl, cpu_with_psl,
+ &d_i->cpu_mask);
+ }
+ }
+
+ /*
+ * Next test if new pseudo-locked region would intersect with
+ * existing region.
+ */
+ if (cpumask_intersects(&d->cpu_mask, cpu_with_psl))
+ ret = true;
+
+ free_cpumask_var(cpu_with_psl);
+ return ret;
+}
+
+/**
+ * pseudo_lock_measure_cycles - Trigger latency measure to pseudo-locked region
+ * @rdtgrp: Resource group to which the pseudo-locked region belongs.
+ * @sel: Selector of which measurement to perform on a pseudo-locked region.
+ *
+ * The measurement of latency to access a pseudo-locked region should be
+ * done from a cpu that is associated with that pseudo-locked region.
+ * Determine which cpu is associated with this region and start a thread on
+ * that cpu to perform the measurement, wait for that thread to complete.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
+{
+ struct pseudo_lock_region *plr = rdtgrp->plr;
+ struct task_struct *thread;
+ unsigned int cpu;
+ int ret = -1;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ if (rdtgrp->flags & RDT_DELETED) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (!plr->d) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ plr->thread_done = 0;
+ cpu = cpumask_first(&plr->d->cpu_mask);
+ if (!cpu_online(cpu)) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ plr->cpu = cpu;
+
+ if (sel == 1)
+ thread = kthread_create_on_node(resctrl_arch_measure_cycles_lat_fn,
+ plr, cpu_to_node(cpu),
+ "pseudo_lock_measure/%u",
+ cpu);
+ else if (sel == 2)
+ thread = kthread_create_on_node(resctrl_arch_measure_l2_residency,
+ plr, cpu_to_node(cpu),
+ "pseudo_lock_measure/%u",
+ cpu);
+ else if (sel == 3)
+ thread = kthread_create_on_node(resctrl_arch_measure_l3_residency,
+ plr, cpu_to_node(cpu),
+ "pseudo_lock_measure/%u",
+ cpu);
+ else
+ goto out;
+
+ if (IS_ERR(thread)) {
+ ret = PTR_ERR(thread);
+ goto out;
+ }
+ kthread_bind(thread, cpu);
+ wake_up_process(thread);
+
+ ret = wait_event_interruptible(plr->lock_thread_wq,
+ plr->thread_done == 1);
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+
+out:
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+ return ret;
+}
+
+static ssize_t pseudo_lock_measure_trigger(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct rdtgroup *rdtgrp = file->private_data;
+ size_t buf_size;
+ char buf[32];
+ int ret;
+ int sel;
+
+ buf_size = min(count, (sizeof(buf) - 1));
+ if (copy_from_user(buf, user_buf, buf_size))
+ return -EFAULT;
+
+ buf[buf_size] = '\0';
+ ret = kstrtoint(buf, 10, &sel);
+ if (ret == 0) {
+ if (sel != 1 && sel != 2 && sel != 3)
+ return -EINVAL;
+ ret = debugfs_file_get(file->f_path.dentry);
+ if (ret)
+ return ret;
+ ret = pseudo_lock_measure_cycles(rdtgrp, sel);
+ if (ret == 0)
+ ret = count;
+ debugfs_file_put(file->f_path.dentry);
+ }
+
+ return ret;
+}
+
+static const struct file_operations pseudo_measure_fops = {
+ .write = pseudo_lock_measure_trigger,
+ .open = simple_open,
+ .llseek = default_llseek,
+};
+
+/**
+ * rdtgroup_pseudo_lock_create - Create a pseudo-locked region
+ * @rdtgrp: resource group to which pseudo-lock region belongs
+ *
+ * Called when a resource group in the pseudo-locksetup mode receives a
+ * valid schemata that should be pseudo-locked. Since the resource group is
+ * in pseudo-locksetup mode the &struct pseudo_lock_region has already been
+ * allocated and initialized with the essential information. If a failure
+ * occurs the resource group remains in the pseudo-locksetup mode with the
+ * &struct pseudo_lock_region associated with it, but cleared from all
+ * information and ready for the user to re-attempt pseudo-locking by
+ * writing the schemata again.
+ *
+ * Return: 0 if the pseudo-locked region was successfully pseudo-locked, <0
+ * on failure. Descriptive error will be written to last_cmd_status buffer.
+ */
+int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
+{
+ struct pseudo_lock_region *plr = rdtgrp->plr;
+ struct task_struct *thread;
+ unsigned int new_minor;
+ struct device *dev;
+ int ret;
+
+ ret = pseudo_lock_region_alloc(plr);
+ if (ret < 0)
+ return ret;
+
+ ret = pseudo_lock_cstates_constrain(plr);
+ if (ret < 0) {
+ ret = -EINVAL;
+ goto out_region;
+ }
+
+ plr->thread_done = 0;
+
+ plr->closid = rdtgrp->closid;
+ thread = kthread_create_on_node(resctrl_arch_pseudo_lock_fn, plr,
+ cpu_to_node(plr->cpu),
+ "pseudo_lock/%u", plr->cpu);
+ if (IS_ERR(thread)) {
+ ret = PTR_ERR(thread);
+ rdt_last_cmd_printf("Locking thread returned error %d\n", ret);
+ goto out_cstates;
+ }
+
+ kthread_bind(thread, plr->cpu);
+ wake_up_process(thread);
+
+ ret = wait_event_interruptible(plr->lock_thread_wq,
+ plr->thread_done == 1);
+ if (ret < 0) {
+ /*
+ * If the thread does not get on the CPU for whatever
+ * reason and the process which sets up the region is
+ * interrupted then this will leave the thread in runnable
+ * state and once it gets on the CPU it will dereference
+ * the cleared, but not freed, plr struct resulting in an
+ * empty pseudo-locking loop.
+ */
+ rdt_last_cmd_puts("Locking thread interrupted\n");
+ goto out_cstates;
+ }
+
+ ret = pseudo_lock_minor_get(&new_minor);
+ if (ret < 0) {
+ rdt_last_cmd_puts("Unable to obtain a new minor number\n");
+ goto out_cstates;
+ }
+
+ /*
+ * Unlock access but do not release the reference. The
+ * pseudo-locked region will still be here on return.
+ *
+ * The mutex has to be released temporarily to avoid a potential
+ * deadlock with the mm->mmap_lock which is obtained in the
+ * device_create() and debugfs_create_dir() callpath below as well as
+ * before the mmap() callback is called.
+ */
+ mutex_unlock(&rdtgroup_mutex);
+
+ if (!IS_ERR_OR_NULL(debugfs_resctrl)) {
+ plr->debugfs_dir = debugfs_create_dir(rdtgrp->kn->name,
+ debugfs_resctrl);
+ if (!IS_ERR_OR_NULL(plr->debugfs_dir))
+ debugfs_create_file("pseudo_lock_measure", 0200,
+ plr->debugfs_dir, rdtgrp,
+ &pseudo_measure_fops);
+ }
+
+ dev = device_create(&pseudo_lock_class, NULL,
+ MKDEV(pseudo_lock_major, new_minor),
+ rdtgrp, "%s", rdtgrp->kn->name);
+
+ mutex_lock(&rdtgroup_mutex);
+
+ if (IS_ERR(dev)) {
+ ret = PTR_ERR(dev);
+ rdt_last_cmd_printf("Failed to create character device: %d\n",
+ ret);
+ goto out_debugfs;
+ }
+
+ /* We released the mutex - check if group was removed while we did so */
+ if (rdtgrp->flags & RDT_DELETED) {
+ ret = -ENODEV;
+ goto out_device;
+ }
+
+ plr->minor = new_minor;
+
+ rdtgrp->mode = RDT_MODE_PSEUDO_LOCKED;
+ closid_free(rdtgrp->closid);
+ rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0444);
+ rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0444);
+
+ ret = 0;
+ goto out;
+
+out_device:
+ device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, new_minor));
+out_debugfs:
+ debugfs_remove_recursive(plr->debugfs_dir);
+ pseudo_lock_minor_release(new_minor);
+out_cstates:
+ pseudo_lock_cstates_relax(plr);
+out_region:
+ pseudo_lock_region_clear(plr);
+out:
+ return ret;
+}
+
+/**
+ * rdtgroup_pseudo_lock_remove - Remove a pseudo-locked region
+ * @rdtgrp: resource group to which the pseudo-locked region belongs
+ *
+ * The removal of a pseudo-locked region can be initiated when the resource
+ * group is removed from user space via a "rmdir" from userspace or the
+ * unmount of the resctrl filesystem. On removal the resource group does
+ * not go back to pseudo-locksetup mode before it is removed, instead it is
+ * removed directly. There is thus asymmetry with the creation where the
+ * &struct pseudo_lock_region is removed here while it was not created in
+ * rdtgroup_pseudo_lock_create().
+ *
+ * Return: void
+ */
+void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp)
+{
+ struct pseudo_lock_region *plr = rdtgrp->plr;
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ /*
+ * Default group cannot be a pseudo-locked region so we can
+ * free closid here.
+ */
+ closid_free(rdtgrp->closid);
+ goto free;
+ }
+
+ pseudo_lock_cstates_relax(plr);
+ debugfs_remove_recursive(rdtgrp->plr->debugfs_dir);
+ device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, plr->minor));
+ pseudo_lock_minor_release(plr->minor);
+
+free:
+ pseudo_lock_free(rdtgrp);
+}
+
+static int pseudo_lock_dev_open(struct inode *inode, struct file *filp)
+{
+ struct rdtgroup *rdtgrp;
+
+ mutex_lock(&rdtgroup_mutex);
+
+ rdtgrp = region_find_by_minor(iminor(inode));
+ if (!rdtgrp) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -ENODEV;
+ }
+
+ filp->private_data = rdtgrp;
+ atomic_inc(&rdtgrp->waitcount);
+ /* Perform a non-seekable open - llseek is not supported */
+ filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
+
+ mutex_unlock(&rdtgroup_mutex);
+
+ return 0;
+}
+
+static int pseudo_lock_dev_release(struct inode *inode, struct file *filp)
+{
+ struct rdtgroup *rdtgrp;
+
+ mutex_lock(&rdtgroup_mutex);
+ rdtgrp = filp->private_data;
+ WARN_ON(!rdtgrp);
+ if (!rdtgrp) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -ENODEV;
+ }
+ filp->private_data = NULL;
+ atomic_dec(&rdtgrp->waitcount);
+ mutex_unlock(&rdtgroup_mutex);
+ return 0;
+}
+
+static int pseudo_lock_dev_mremap(struct vm_area_struct *area)
+{
+ /* Not supported */
+ return -EINVAL;
+}
+
+static const struct vm_operations_struct pseudo_mmap_ops = {
+ .mremap = pseudo_lock_dev_mremap,
+};
+
+static int pseudo_lock_dev_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ unsigned long vsize = vma->vm_end - vma->vm_start;
+ unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
+ struct pseudo_lock_region *plr;
+ struct rdtgroup *rdtgrp;
+ unsigned long physical;
+ unsigned long psize;
+
+ mutex_lock(&rdtgroup_mutex);
+
+ rdtgrp = filp->private_data;
+ WARN_ON(!rdtgrp);
+ if (!rdtgrp) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -ENODEV;
+ }
+
+ plr = rdtgrp->plr;
+
+ if (!plr->d) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -ENODEV;
+ }
+
+ /*
+ * Task is required to run with affinity to the cpus associated
+ * with the pseudo-locked region. If this is not the case the task
+ * may be scheduled elsewhere and invalidate entries in the
+ * pseudo-locked region.
+ */
+ if (!cpumask_subset(current->cpus_ptr, &plr->d->cpu_mask)) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -EINVAL;
+ }
+
+ physical = __pa(plr->kmem) >> PAGE_SHIFT;
+ psize = plr->size - off;
+
+ if (off > plr->size) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -ENOSPC;
+ }
+
+ /*
+ * Ensure changes are carried directly to the memory being mapped,
+ * do not allow copy-on-write mapping.
+ */
+ if (!(vma->vm_flags & VM_SHARED)) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -EINVAL;
+ }
+
+ if (vsize > psize) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -ENOSPC;
+ }
+
+ memset(plr->kmem + off, 0, vsize);
+
+ if (remap_pfn_range(vma, vma->vm_start, physical + vma->vm_pgoff,
+ vsize, vma->vm_page_prot)) {
+ mutex_unlock(&rdtgroup_mutex);
+ return -EAGAIN;
+ }
+ vma->vm_ops = &pseudo_mmap_ops;
+ mutex_unlock(&rdtgroup_mutex);
+ return 0;
+}
+
+static const struct file_operations pseudo_lock_dev_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = NULL,
+ .write = NULL,
+ .open = pseudo_lock_dev_open,
+ .release = pseudo_lock_dev_release,
+ .mmap = pseudo_lock_dev_mmap,
+};
+
+int rdt_pseudo_lock_init(void)
+{
+ int ret;
+
+ ret = register_chrdev(0, "pseudo_lock", &pseudo_lock_dev_fops);
+ if (ret < 0)
+ return ret;
+
+ pseudo_lock_major = ret;
+
+ ret = class_register(&pseudo_lock_class);
+ if (ret) {
+ unregister_chrdev(pseudo_lock_major, "pseudo_lock");
+ return ret;
+ }
+
+ return 0;
+}
+
+void rdt_pseudo_lock_release(void)
+{
+ class_unregister(&pseudo_lock_class);
+ unregister_chrdev(pseudo_lock_major, "pseudo_lock");
+ pseudo_lock_major = 0;
+}
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index e69de29bb2d1..8b18224eda35 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -0,0 +1,4013 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * User interface for Resource Allocation in Resource Director Technology(RDT)
+ *
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * Author: Fenghua Yu <fenghua.yu@...el.com>
+ *
+ * More information about RDT be found in the Intel (R) x86 Architecture
+ * Software Developer Manual.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cacheinfo.h>
+#include <linux/cpu.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/fs_parser.h>
+#include <linux/sysfs.h>
+#include <linux/kernfs.h>
+#include <linux/seq_buf.h>
+#include <linux/seq_file.h>
+#include <linux/sched/signal.h>
+#include <linux/sched/task.h>
+#include <linux/slab.h>
+#include <linux/task_work.h>
+#include <linux/user_namespace.h>
+
+#include <uapi/linux/magic.h>
+
+#include <asm/resctrl.h>
+#include "internal.h"
+
+/* Mutex to protect rdtgroup access. */
+DEFINE_MUTEX(rdtgroup_mutex);
+
+static struct kernfs_root *rdt_root;
+struct rdtgroup rdtgroup_default;
+LIST_HEAD(rdt_all_groups);
+
+/* list of entries for the schemata file */
+LIST_HEAD(resctrl_schema_all);
+
+/* The filesystem can only be mounted once. */
+bool resctrl_mounted;
+
+/* Kernel fs node for "info" directory under root */
+static struct kernfs_node *kn_info;
+
+/* Kernel fs node for "mon_groups" directory under root */
+static struct kernfs_node *kn_mongrp;
+
+/* Kernel fs node for "mon_data" directory under root */
+static struct kernfs_node *kn_mondata;
+
+/*
+ * Used to store the max resource name width and max resource data width
+ * to display the schemata in a tabular format
+ */
+int max_name_width, max_data_width;
+
+static struct seq_buf last_cmd_status;
+static char last_cmd_status_buf[512];
+
+static int rdtgroup_setup_root(struct rdt_fs_context *ctx);
+static void rdtgroup_destroy_root(void);
+
+struct dentry *debugfs_resctrl;
+
+static bool resctrl_debug;
+
+void rdt_last_cmd_clear(void)
+{
+ lockdep_assert_held(&rdtgroup_mutex);
+ seq_buf_clear(&last_cmd_status);
+}
+
+void rdt_last_cmd_puts(const char *s)
+{
+ lockdep_assert_held(&rdtgroup_mutex);
+ seq_buf_puts(&last_cmd_status, s);
+}
+
+void rdt_last_cmd_printf(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ lockdep_assert_held(&rdtgroup_mutex);
+ seq_buf_vprintf(&last_cmd_status, fmt, ap);
+ va_end(ap);
+}
+
+void rdt_staged_configs_clear(void)
+{
+ enum resctrl_res_level i;
+ struct rdt_resource *r;
+ struct rdt_domain *dom;
+
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+ r = resctrl_arch_get_resource(i);
+ if (!r->alloc_capable)
+ continue;
+
+ list_for_each_entry(dom, &r->domains, list)
+ memset(dom->staged_config, 0, sizeof(dom->staged_config));
+ }
+}
+
+static bool resctrl_is_mbm_enabled(void)
+{
+ return (resctrl_arch_is_mbm_total_enabled() ||
+ resctrl_arch_is_mbm_local_enabled());
+}
+
+static bool resctrl_is_mbm_event(int e)
+{
+ return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
+ e <= QOS_L3_MBM_LOCAL_EVENT_ID);
+}
+
+/*
+ * Trivial allocator for CLOSIDs. Since h/w only supports a small number,
+ * we can keep a bitmap of free CLOSIDs in a single integer.
+ *
+ * Using a global CLOSID across all resources has some advantages and
+ * some drawbacks:
+ * + We can simply set current's closid to assign a task to a resource
+ * group.
+ * + Context switch code can avoid extra memory references deciding which
+ * CLOSID to load into the PQR_ASSOC MSR
+ * - We give up some options in configuring resource groups across multi-socket
+ * systems.
+ * - Our choices on how to configure each resource become progressively more
+ * limited as the number of resources grows.
+ */
+static unsigned long closid_free_map;
+static int closid_free_map_len;
+
+int closids_supported(void)
+{
+ return closid_free_map_len;
+}
+
+static void closid_init(void)
+{
+ struct resctrl_schema *s;
+ u32 rdt_min_closid = 32;
+
+ /* Compute rdt_min_closid across all resources */
+ list_for_each_entry(s, &resctrl_schema_all, list)
+ rdt_min_closid = min(rdt_min_closid, s->num_closid);
+
+ closid_free_map = BIT_MASK(rdt_min_closid) - 1;
+
+ /* RESCTRL_RESERVED_CLOSID is always reserved for the default group */
+ __clear_bit(RESCTRL_RESERVED_CLOSID, &closid_free_map);
+ closid_free_map_len = rdt_min_closid;
+}
+
+static int closid_alloc(void)
+{
+ int cleanest_closid;
+ u32 closid;
+
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
+ resctrl_arch_is_llc_occupancy_enabled()) {
+ cleanest_closid = resctrl_find_cleanest_closid();
+ if (cleanest_closid < 0)
+ return cleanest_closid;
+ closid = cleanest_closid;
+ } else {
+ closid = ffs(closid_free_map);
+ if (closid == 0)
+ return -ENOSPC;
+ closid--;
+ }
+ __clear_bit(closid, &closid_free_map);
+
+ return closid;
+}
+
+void closid_free(int closid)
+{
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ __set_bit(closid, &closid_free_map);
+}
+
+/**
+ * closid_allocated - test if provided closid is in use
+ * @closid: closid to be tested
+ *
+ * Return: true if @closid is currently associated with a resource group,
+ * false if @closid is free
+ */
+bool closid_allocated(unsigned int closid)
+{
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ return !test_bit(closid, &closid_free_map);
+}
+
+/**
+ * rdtgroup_mode_by_closid - Return mode of resource group with closid
+ * @closid: closid if the resource group
+ *
+ * Each resource group is associated with a @closid. Here the mode
+ * of a resource group can be queried by searching for it using its closid.
+ *
+ * Return: mode as &enum rdtgrp_mode of resource group with closid @closid
+ */
+enum rdtgrp_mode rdtgroup_mode_by_closid(int closid)
+{
+ struct rdtgroup *rdtgrp;
+
+ list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+ if (rdtgrp->closid == closid)
+ return rdtgrp->mode;
+ }
+
+ return RDT_NUM_MODES;
+}
+
+static const char * const rdt_mode_str[] = {
+ [RDT_MODE_SHAREABLE] = "shareable",
+ [RDT_MODE_EXCLUSIVE] = "exclusive",
+ [RDT_MODE_PSEUDO_LOCKSETUP] = "pseudo-locksetup",
+ [RDT_MODE_PSEUDO_LOCKED] = "pseudo-locked",
+};
+
+/**
+ * rdtgroup_mode_str - Return the string representation of mode
+ * @mode: the resource group mode as &enum rdtgroup_mode
+ *
+ * Return: string representation of valid mode, "unknown" otherwise
+ */
+static const char *rdtgroup_mode_str(enum rdtgrp_mode mode)
+{
+ if (mode < RDT_MODE_SHAREABLE || mode >= RDT_NUM_MODES)
+ return "unknown";
+
+ return rdt_mode_str[mode];
+}
+
+/* set uid and gid of rdtgroup dirs and files to that of the creator */
+static int rdtgroup_kn_set_ugid(struct kernfs_node *kn)
+{
+ struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID,
+ .ia_uid = current_fsuid(),
+ .ia_gid = current_fsgid(), };
+
+ if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) &&
+ gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID))
+ return 0;
+
+ return kernfs_setattr(kn, &iattr);
+}
+
+static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft)
+{
+ struct kernfs_node *kn;
+ int ret;
+
+ kn = __kernfs_create_file(parent_kn, rft->name, rft->mode,
+ GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
+ 0, rft->kf_ops, rft, NULL, NULL);
+ if (IS_ERR(kn))
+ return PTR_ERR(kn);
+
+ ret = rdtgroup_kn_set_ugid(kn);
+ if (ret) {
+ kernfs_remove(kn);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rdtgroup_seqfile_show(struct seq_file *m, void *arg)
+{
+ struct kernfs_open_file *of = m->private;
+ struct rftype *rft = of->kn->priv;
+
+ if (rft->seq_show)
+ return rft->seq_show(of, m, arg);
+ return 0;
+}
+
+static ssize_t rdtgroup_file_write(struct kernfs_open_file *of, char *buf,
+ size_t nbytes, loff_t off)
+{
+ struct rftype *rft = of->kn->priv;
+
+ if (rft->write)
+ return rft->write(of, buf, nbytes, off);
+
+ return -EINVAL;
+}
+
+static const struct kernfs_ops rdtgroup_kf_single_ops = {
+ .atomic_write_len = PAGE_SIZE,
+ .write = rdtgroup_file_write,
+ .seq_show = rdtgroup_seqfile_show,
+};
+
+static const struct kernfs_ops kf_mondata_ops = {
+ .atomic_write_len = PAGE_SIZE,
+ .seq_show = rdtgroup_mondata_show,
+};
+
+static bool is_cpu_list(struct kernfs_open_file *of)
+{
+ struct rftype *rft = of->kn->priv;
+
+ return rft->flags & RFTYPE_FLAGS_CPUS_LIST;
+}
+
+static int rdtgroup_cpus_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdtgroup *rdtgrp;
+ struct cpumask *mask;
+ int ret = 0;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+
+ if (rdtgrp) {
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+ if (!rdtgrp->plr->d) {
+ rdt_last_cmd_clear();
+ rdt_last_cmd_puts("Cache domain offline\n");
+ ret = -ENODEV;
+ } else {
+ mask = &rdtgrp->plr->d->cpu_mask;
+ seq_printf(s, is_cpu_list(of) ?
+ "%*pbl\n" : "%*pb\n",
+ cpumask_pr_args(mask));
+ }
+ } else {
+ seq_printf(s, is_cpu_list(of) ? "%*pbl\n" : "%*pb\n",
+ cpumask_pr_args(&rdtgrp->cpu_mask));
+ }
+ } else {
+ ret = -ENOENT;
+ }
+ rdtgroup_kn_unlock(of->kn);
+
+ return ret;
+}
+
+/*
+ * Update the PGR_ASSOC MSR on all cpus in @cpu_mask,
+ *
+ * Per task closids/rmids must have been set up before calling this function.
+ * @r may be NULL.
+ */
+static void
+update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
+{
+ struct resctrl_cpu_defaults defaults, *p = NULL;
+
+ if (r) {
+ defaults.closid = r->closid;
+ defaults.rmid = r->mon.rmid;
+ p = &defaults;
+ }
+
+ on_each_cpu_mask(cpu_mask, resctrl_arch_sync_cpu_closid_rmid, p, 1);
+}
+
+static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
+ cpumask_var_t tmpmask)
+{
+ struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp;
+ struct list_head *head;
+
+ /* Check whether cpus belong to parent ctrl group */
+ cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);
+ if (!cpumask_empty(tmpmask)) {
+ rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n");
+ return -EINVAL;
+ }
+
+ /* Check whether cpus are dropped from this group */
+ cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
+ if (!cpumask_empty(tmpmask)) {
+ /* Give any dropped cpus to parent rdtgroup */
+ cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask);
+ update_closid_rmid(tmpmask, prgrp);
+ }
+
+ /*
+ * If we added cpus, remove them from previous group that owned them
+ * and update per-cpu rmid
+ */
+ cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
+ if (!cpumask_empty(tmpmask)) {
+ head = &prgrp->mon.crdtgrp_list;
+ list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+ if (crgrp == rdtgrp)
+ continue;
+ cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask,
+ tmpmask);
+ }
+ update_closid_rmid(tmpmask, rdtgrp);
+ }
+
+ /* Done pushing/pulling - update this group with new mask */
+ cpumask_copy(&rdtgrp->cpu_mask, newmask);
+
+ return 0;
+}
+
+static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m)
+{
+ struct rdtgroup *crgrp;
+
+ cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m);
+ /* update the child mon group masks as well*/
+ list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list)
+ cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask);
+}
+
+static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
+ cpumask_var_t tmpmask, cpumask_var_t tmpmask1)
+{
+ struct rdtgroup *r, *crgrp;
+ struct list_head *head;
+
+ /* Check whether cpus are dropped from this group */
+ cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
+ if (!cpumask_empty(tmpmask)) {
+ /* Can't drop from default group */
+ if (rdtgrp == &rdtgroup_default) {
+ rdt_last_cmd_puts("Can't drop CPUs from default group\n");
+ return -EINVAL;
+ }
+
+ /* Give any dropped cpus to rdtgroup_default */
+ cpumask_or(&rdtgroup_default.cpu_mask,
+ &rdtgroup_default.cpu_mask, tmpmask);
+ update_closid_rmid(tmpmask, &rdtgroup_default);
+ }
+
+ /*
+ * If we added cpus, remove them from previous group and
+ * the prev group's child groups that owned them
+ * and update per-cpu closid/rmid.
+ */
+ cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
+ if (!cpumask_empty(tmpmask)) {
+ list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) {
+ if (r == rdtgrp)
+ continue;
+ cpumask_and(tmpmask1, &r->cpu_mask, tmpmask);
+ if (!cpumask_empty(tmpmask1))
+ cpumask_rdtgrp_clear(r, tmpmask1);
+ }
+ update_closid_rmid(tmpmask, rdtgrp);
+ }
+
+ /* Done pushing/pulling - update this group with new mask */
+ cpumask_copy(&rdtgrp->cpu_mask, newmask);
+
+ /*
+ * Clear child mon group masks since there is a new parent mask
+ * now and update the rmid for the cpus the child lost.
+ */
+ head = &rdtgrp->mon.crdtgrp_list;
+ list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+ cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask);
+ update_closid_rmid(tmpmask, rdtgrp);
+ cpumask_clear(&crgrp->cpu_mask);
+ }
+
+ return 0;
+}
+
+static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ cpumask_var_t tmpmask, newmask, tmpmask1;
+ struct rdtgroup *rdtgrp;
+ int ret;
+
+ if (!buf)
+ return -EINVAL;
+
+ if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
+ return -ENOMEM;
+ if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) {
+ free_cpumask_var(tmpmask);
+ return -ENOMEM;
+ }
+ if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) {
+ free_cpumask_var(tmpmask);
+ free_cpumask_var(newmask);
+ return -ENOMEM;
+ }
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ ret = -ENOENT;
+ goto unlock;
+ }
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ ret = -EINVAL;
+ rdt_last_cmd_puts("Pseudo-locking in progress\n");
+ goto unlock;
+ }
+
+ if (is_cpu_list(of))
+ ret = cpulist_parse(buf, newmask);
+ else
+ ret = cpumask_parse(buf, newmask);
+
+ if (ret) {
+ rdt_last_cmd_puts("Bad CPU list/mask\n");
+ goto unlock;
+ }
+
+ /* check that user didn't specify any offline cpus */
+ cpumask_andnot(tmpmask, newmask, cpu_online_mask);
+ if (!cpumask_empty(tmpmask)) {
+ ret = -EINVAL;
+ rdt_last_cmd_puts("Can only assign online CPUs\n");
+ goto unlock;
+ }
+
+ if (rdtgrp->type == RDTCTRL_GROUP)
+ ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1);
+ else if (rdtgrp->type == RDTMON_GROUP)
+ ret = cpus_mon_write(rdtgrp, newmask, tmpmask);
+ else
+ ret = -EINVAL;
+
+unlock:
+ rdtgroup_kn_unlock(of->kn);
+ free_cpumask_var(tmpmask);
+ free_cpumask_var(newmask);
+ free_cpumask_var(tmpmask1);
+
+ return ret ?: nbytes;
+}
+
+/**
+ * rdtgroup_remove - the helper to remove resource group safely
+ * @rdtgrp: resource group to remove
+ *
+ * On resource group creation via a mkdir, an extra kernfs_node reference is
+ * taken to ensure that the rdtgroup structure remains accessible for the
+ * rdtgroup_kn_unlock() calls where it is removed.
+ *
+ * Drop the extra reference here, then free the rdtgroup structure.
+ *
+ * Return: void
+ */
+static void rdtgroup_remove(struct rdtgroup *rdtgrp)
+{
+ kernfs_put(rdtgrp->kn);
+ kfree(rdtgrp);
+}
+
+static void _update_task_closid_rmid(void *task)
+{
+ /*
+ * If the task is still current on this CPU, update PQR_ASSOC MSR.
+ * Otherwise, the MSR is updated when the task is scheduled in.
+ */
+ if (task == current)
+ resctrl_arch_sched_in(task);
+}
+
+static void update_task_closid_rmid(struct task_struct *t)
+{
+ if (IS_ENABLED(CONFIG_SMP) && task_curr(t))
+ smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1);
+ else
+ _update_task_closid_rmid(t);
+}
+
+static bool task_in_rdtgroup(struct task_struct *tsk, struct rdtgroup *rdtgrp)
+{
+ u32 closid, rmid = rdtgrp->mon.rmid;
+
+ if (rdtgrp->type == RDTCTRL_GROUP)
+ closid = rdtgrp->closid;
+ else if (rdtgrp->type == RDTMON_GROUP)
+ closid = rdtgrp->mon.parent->closid;
+ else
+ return false;
+
+ return resctrl_arch_match_closid(tsk, closid) &&
+ resctrl_arch_match_rmid(tsk, closid, rmid);
+}
+
+static int __rdtgroup_move_task(struct task_struct *tsk,
+ struct rdtgroup *rdtgrp)
+{
+ /* If the task is already in rdtgrp, no need to move the task. */
+ if (task_in_rdtgroup(tsk, rdtgrp))
+ return 0;
+
+ /*
+ * Set the task's closid/rmid before the PQR_ASSOC MSR can be
+ * updated by them.
+ *
+ * For ctrl_mon groups, move both closid and rmid.
+ * For monitor groups, can move the tasks only from
+ * their parent CTRL group.
+ */
+ if (rdtgrp->type == RDTMON_GROUP &&
+ !resctrl_arch_match_closid(tsk, rdtgrp->mon.parent->closid)) {
+ rdt_last_cmd_puts("Can't move task to different control group\n");
+ return -EINVAL;
+ }
+
+ if (rdtgrp->type == RDTMON_GROUP)
+ resctrl_arch_set_closid_rmid(tsk, rdtgrp->mon.parent->closid,
+ rdtgrp->mon.rmid);
+ else
+ resctrl_arch_set_closid_rmid(tsk, rdtgrp->closid,
+ rdtgrp->mon.rmid);
+
+ /*
+ * Ensure the task's closid and rmid are written before determining if
+ * the task is current that will decide if it will be interrupted.
+ * This pairs with the full barrier between the rq->curr update and
+ * resctrl_arch_sched_in() during context switch.
+ */
+ smp_mb();
+
+ /*
+ * By now, the task's closid and rmid are set. If the task is current
+ * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource
+ * group go into effect. If the task is not current, the MSR will be
+ * updated when the task is scheduled in.
+ */
+ update_task_closid_rmid(tsk);
+
+ return 0;
+}
+
+static bool is_closid_match(struct task_struct *t, struct rdtgroup *r)
+{
+ return (resctrl_arch_alloc_capable() && (r->type == RDTCTRL_GROUP) &&
+ resctrl_arch_match_closid(t, r->closid));
+}
+
+static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r)
+{
+ return (resctrl_arch_mon_capable() && (r->type == RDTMON_GROUP) &&
+ resctrl_arch_match_rmid(t, r->mon.parent->closid,
+ r->mon.rmid));
+}
+
+/**
+ * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group
+ * @r: Resource group
+ *
+ * Return: 1 if tasks have been assigned to @r, 0 otherwise
+ */
+int rdtgroup_tasks_assigned(struct rdtgroup *r)
+{
+ struct task_struct *p, *t;
+ int ret = 0;
+
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ rcu_read_lock();
+ for_each_process_thread(p, t) {
+ if (is_closid_match(t, r) || is_rmid_match(t, r)) {
+ ret = 1;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
+static int rdtgroup_task_write_permission(struct task_struct *task,
+ struct kernfs_open_file *of)
+{
+ const struct cred *tcred = get_task_cred(task);
+ const struct cred *cred = current_cred();
+ int ret = 0;
+
+ /*
+ * Even if we're attaching all tasks in the thread group, we only
+ * need to check permissions on one of them.
+ */
+ if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) &&
+ !uid_eq(cred->euid, tcred->uid) &&
+ !uid_eq(cred->euid, tcred->suid)) {
+ rdt_last_cmd_printf("No permission to move task %d\n", task->pid);
+ ret = -EPERM;
+ }
+
+ put_cred(tcred);
+ return ret;
+}
+
+static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp,
+ struct kernfs_open_file *of)
+{
+ struct task_struct *tsk;
+ int ret;
+
+ rcu_read_lock();
+ if (pid) {
+ tsk = find_task_by_vpid(pid);
+ if (!tsk) {
+ rcu_read_unlock();
+ rdt_last_cmd_printf("No task %d\n", pid);
+ return -ESRCH;
+ }
+ } else {
+ tsk = current;
+ }
+
+ get_task_struct(tsk);
+ rcu_read_unlock();
+
+ ret = rdtgroup_task_write_permission(tsk, of);
+ if (!ret)
+ ret = __rdtgroup_move_task(tsk, rdtgrp);
+
+ put_task_struct(tsk);
+ return ret;
+}
+
+static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ struct rdtgroup *rdtgrp;
+ char *pid_str;
+ int ret = 0;
+ pid_t pid;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ rdtgroup_kn_unlock(of->kn);
+ return -ENOENT;
+ }
+ rdt_last_cmd_clear();
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ ret = -EINVAL;
+ rdt_last_cmd_puts("Pseudo-locking in progress\n");
+ goto unlock;
+ }
+
+ while (buf && buf[0] != '\0' && buf[0] != '\n') {
+ pid_str = strim(strsep(&buf, ","));
+
+ if (kstrtoint(pid_str, 0, &pid)) {
+ rdt_last_cmd_printf("Task list parsing error pid %s\n", pid_str);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (pid < 0) {
+ rdt_last_cmd_printf("Invalid pid %d\n", pid);
+ ret = -EINVAL;
+ break;
+ }
+
+ ret = rdtgroup_move_task(pid, rdtgrp, of);
+ if (ret) {
+ rdt_last_cmd_printf("Error while processing task %d\n", pid);
+ break;
+ }
+ }
+
+unlock:
+ rdtgroup_kn_unlock(of->kn);
+
+ return ret ?: nbytes;
+}
+
+static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s)
+{
+ struct task_struct *p, *t;
+ pid_t pid;
+
+ rcu_read_lock();
+ for_each_process_thread(p, t) {
+ if (is_closid_match(t, r) || is_rmid_match(t, r)) {
+ pid = task_pid_vnr(t);
+ if (pid)
+ seq_printf(s, "%d\n", pid);
+ }
+ }
+ rcu_read_unlock();
+}
+
+static int rdtgroup_tasks_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdtgroup *rdtgrp;
+ int ret = 0;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (rdtgrp)
+ show_rdt_tasks(rdtgrp, s);
+ else
+ ret = -ENOENT;
+ rdtgroup_kn_unlock(of->kn);
+
+ return ret;
+}
+
+static int rdtgroup_closid_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdtgroup *rdtgrp;
+ int ret = 0;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (rdtgrp)
+ seq_printf(s, "%u\n", rdtgrp->closid);
+ else
+ ret = -ENOENT;
+ rdtgroup_kn_unlock(of->kn);
+
+ return ret;
+}
+
+static int rdtgroup_rmid_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdtgroup *rdtgrp;
+ int ret = 0;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (rdtgrp)
+ seq_printf(s, "%u\n", rdtgrp->mon.rmid);
+ else
+ ret = -ENOENT;
+ rdtgroup_kn_unlock(of->kn);
+
+ return ret;
+}
+
+#ifdef CONFIG_PROC_CPU_RESCTRL
+
+/*
+ * A task can only be part of one resctrl control group and of one monitor
+ * group which is associated to that control group.
+ *
+ * 1) res:
+ * mon:
+ *
+ * resctrl is not available.
+ *
+ * 2) res:/
+ * mon:
+ *
+ * Task is part of the root resctrl control group, and it is not associated
+ * to any monitor group.
+ *
+ * 3) res:/
+ * mon:mon0
+ *
+ * Task is part of the root resctrl control group and monitor group mon0.
+ *
+ * 4) res:group0
+ * mon:
+ *
+ * Task is part of resctrl control group group0, and it is not associated
+ * to any monitor group.
+ *
+ * 5) res:group0
+ * mon:mon1
+ *
+ * Task is part of resctrl control group group0 and monitor group mon1.
+ */
+int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *tsk)
+{
+ struct rdtgroup *rdtg;
+ int ret = 0;
+
+ mutex_lock(&rdtgroup_mutex);
+
+ /* Return empty if resctrl has not been mounted. */
+ if (!resctrl_mounted) {
+ seq_puts(s, "res:\nmon:\n");
+ goto unlock;
+ }
+
+ list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
+ struct rdtgroup *crg;
+
+ /*
+ * Task information is only relevant for shareable
+ * and exclusive groups.
+ */
+ if (rdtg->mode != RDT_MODE_SHAREABLE &&
+ rdtg->mode != RDT_MODE_EXCLUSIVE)
+ continue;
+
+ if (!resctrl_arch_match_closid(tsk, rdtg->closid))
+ continue;
+
+ seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "",
+ rdtg->kn->name);
+ seq_puts(s, "mon:");
+ list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
+ mon.crdtgrp_list) {
+ if (!resctrl_arch_match_rmid(tsk, crg->mon.parent->closid,
+ crg->mon.rmid))
+ continue;
+ seq_printf(s, "%s", crg->kn->name);
+ break;
+ }
+ seq_putc(s, '\n');
+ goto unlock;
+ }
+ /*
+ * The above search should succeed. Otherwise return
+ * with an error.
+ */
+ ret = -ENOENT;
+unlock:
+ mutex_unlock(&rdtgroup_mutex);
+
+ return ret;
+}
+#endif
+
+static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ int len;
+
+ mutex_lock(&rdtgroup_mutex);
+ len = seq_buf_used(&last_cmd_status);
+ if (len)
+ seq_printf(seq, "%.*s", len, last_cmd_status_buf);
+ else
+ seq_puts(seq, "ok\n");
+ mutex_unlock(&rdtgroup_mutex);
+ return 0;
+}
+
+static int rdt_num_closids_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+
+ seq_printf(seq, "%u\n", s->num_closid);
+ return 0;
+}
+
+static int rdt_default_ctrl_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+
+ seq_printf(seq, "%x\n", r->default_ctrl);
+ return 0;
+}
+
+static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+
+ seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
+ return 0;
+}
+
+static int rdt_shareable_bits_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+
+ seq_printf(seq, "%x\n", r->cache.shareable_bits);
+ return 0;
+}
+
+/*
+ * rdt_bit_usage_show - Display current usage of resources
+ *
+ * A domain is a shared resource that can now be allocated differently. Here
+ * we display the current regions of the domain as an annotated bitmask.
+ * For each domain of this resource its allocation bitmask
+ * is annotated as below to indicate the current usage of the corresponding bit:
+ * 0 - currently unused
+ * X - currently available for sharing and used by software and hardware
+ * H - currently used by hardware only but available for software use
+ * S - currently used and shareable by software only
+ * E - currently used exclusively by one resource group
+ * P - currently pseudo-locked by one resource group
+ */
+static int rdt_bit_usage_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ /*
+ * Use unsigned long even though only 32 bits are used to ensure
+ * test_bit() is used safely.
+ */
+ unsigned long sw_shareable = 0, hw_shareable = 0;
+ unsigned long exclusive = 0, pseudo_locked = 0;
+ struct rdt_resource *r = s->res;
+ struct rdt_domain *dom;
+ int i, hwb, swb, excl, psl;
+ enum rdtgrp_mode mode;
+ bool sep = false;
+ u32 ctrl_val;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+ hw_shareable = r->cache.shareable_bits;
+ list_for_each_entry(dom, &r->domains, list) {
+ if (sep)
+ seq_putc(seq, ';');
+ sw_shareable = 0;
+ exclusive = 0;
+ seq_printf(seq, "%d=", dom->id);
+ for (i = 0; i < closids_supported(); i++) {
+ if (!closid_allocated(i))
+ continue;
+ ctrl_val = resctrl_arch_get_config(r, dom, i,
+ s->conf_type);
+ mode = rdtgroup_mode_by_closid(i);
+ switch (mode) {
+ case RDT_MODE_SHAREABLE:
+ sw_shareable |= ctrl_val;
+ break;
+ case RDT_MODE_EXCLUSIVE:
+ exclusive |= ctrl_val;
+ break;
+ case RDT_MODE_PSEUDO_LOCKSETUP:
+ /*
+ * RDT_MODE_PSEUDO_LOCKSETUP is possible
+ * here but not included since the CBM
+ * associated with this CLOSID in this mode
+ * is not initialized and no task or cpu can be
+ * assigned this CLOSID.
+ */
+ break;
+ case RDT_MODE_PSEUDO_LOCKED:
+ case RDT_NUM_MODES:
+ WARN(1,
+ "invalid mode for closid %d\n", i);
+ break;
+ }
+ }
+ for (i = r->cache.cbm_len - 1; i >= 0; i--) {
+ pseudo_locked = dom->plr ? dom->plr->cbm : 0;
+ hwb = test_bit(i, &hw_shareable);
+ swb = test_bit(i, &sw_shareable);
+ excl = test_bit(i, &exclusive);
+ psl = test_bit(i, &pseudo_locked);
+ if (hwb && swb)
+ seq_putc(seq, 'X');
+ else if (hwb && !swb)
+ seq_putc(seq, 'H');
+ else if (!hwb && swb)
+ seq_putc(seq, 'S');
+ else if (excl)
+ seq_putc(seq, 'E');
+ else if (psl)
+ seq_putc(seq, 'P');
+ else /* Unused bits remain */
+ seq_putc(seq, '0');
+ }
+ sep = true;
+ }
+ seq_putc(seq, '\n');
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+ return 0;
+}
+
+static int rdt_min_bw_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+
+ seq_printf(seq, "%u\n", r->membw.min_bw);
+ return 0;
+}
+
+static int rdt_num_rmids_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+
+ seq_printf(seq, "%d\n", r->num_rmid);
+
+ return 0;
+}
+
+static int rdt_mon_features_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+ struct mon_evt *mevt;
+
+ list_for_each_entry(mevt, &r->evt_list, list) {
+ seq_printf(seq, "%s\n", mevt->name);
+ if (mevt->configurable)
+ seq_printf(seq, "%s_config\n", mevt->name);
+ }
+
+ return 0;
+}
+
+static int rdt_bw_gran_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+
+ seq_printf(seq, "%u\n", r->membw.bw_gran);
+ return 0;
+}
+
+static int rdt_delay_linear_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+
+ seq_printf(seq, "%u\n", r->membw.delay_linear);
+ return 0;
+}
+
+static int max_threshold_occ_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ seq_printf(seq, "%u\n", resctrl_rmid_realloc_threshold);
+
+ return 0;
+}
+
+static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+
+ if (r->membw.throttle_mode == THREAD_THROTTLE_PER_THREAD)
+ seq_puts(seq, "per-thread\n");
+ else
+ seq_puts(seq, "max\n");
+
+ return 0;
+}
+
+static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ unsigned int bytes;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &bytes);
+ if (ret)
+ return ret;
+
+ if (bytes > resctrl_rmid_realloc_limit)
+ return -EINVAL;
+
+ resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(bytes);
+
+ return nbytes;
+}
+
+/*
+ * rdtgroup_mode_show - Display mode of this resource group
+ */
+static int rdtgroup_mode_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdtgroup *rdtgrp;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ rdtgroup_kn_unlock(of->kn);
+ return -ENOENT;
+ }
+
+ seq_printf(s, "%s\n", rdtgroup_mode_str(rdtgrp->mode));
+
+ rdtgroup_kn_unlock(of->kn);
+ return 0;
+}
+
+static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
+{
+ switch (my_type) {
+ case CDP_CODE:
+ return CDP_DATA;
+ case CDP_DATA:
+ return CDP_CODE;
+ default:
+ case CDP_NONE:
+ return CDP_NONE;
+ }
+}
+
+static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = of->kn->parent->priv;
+ struct rdt_resource *r = s->res;
+
+ seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);
+
+ return 0;
+}
+
+/**
+ * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other
+ * @r: Resource to which domain instance @d belongs.
+ * @d: The domain instance for which @closid is being tested.
+ * @cbm: Capacity bitmask being tested.
+ * @closid: Intended closid for @cbm.
+ * @type: CDP type of @r.
+ * @exclusive: Only check if overlaps with exclusive resource groups
+ *
+ * Checks if provided @cbm intended to be used for @closid on domain
+ * @d overlaps with any other closids or other hardware usage associated
+ * with this domain. If @exclusive is true then only overlaps with
+ * resource groups in exclusive mode will be considered. If @exclusive
+ * is false then overlaps with any resource group or hardware entities
+ * will be considered.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used, to make the
+ * bitmap functions work correctly.
+ *
+ * Return: false if CBM does not overlap, true if it does.
+ */
+static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
+ unsigned long cbm, int closid,
+ enum resctrl_conf_type type, bool exclusive)
+{
+ enum rdtgrp_mode mode;
+ unsigned long ctrl_b;
+ int i;
+
+ /* Check for any overlap with regions used by hardware directly */
+ if (!exclusive) {
+ ctrl_b = r->cache.shareable_bits;
+ if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len))
+ return true;
+ }
+
+ /* Check for overlap with other resource groups */
+ for (i = 0; i < closids_supported(); i++) {
+ ctrl_b = resctrl_arch_get_config(r, d, i, type);
+ mode = rdtgroup_mode_by_closid(i);
+ if (closid_allocated(i) && i != closid &&
+ mode != RDT_MODE_PSEUDO_LOCKSETUP) {
+ if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) {
+ if (exclusive) {
+ if (mode == RDT_MODE_EXCLUSIVE)
+ return true;
+ continue;
+ }
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+/**
+ * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware
+ * @s: Schema for the resource to which domain instance @d belongs.
+ * @d: The domain instance for which @closid is being tested.
+ * @cbm: Capacity bitmask being tested.
+ * @closid: Intended closid for @cbm.
+ * @exclusive: Only check if overlaps with exclusive resource groups
+ *
+ * Resources that can be allocated using a CBM can use the CBM to control
+ * the overlap of these allocations. rdtgroup_cmb_overlaps() is the test
+ * for overlap. Overlap test is not limited to the specific resource for
+ * which the CBM is intended though - when dealing with CDP resources that
+ * share the underlying hardware the overlap check should be performed on
+ * the CDP resource sharing the hardware also.
+ *
+ * Refer to description of __rdtgroup_cbm_overlaps() for the details of the
+ * overlap test.
+ *
+ * Return: true if CBM overlap detected, false if there is no overlap
+ */
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
+ unsigned long cbm, int closid, bool exclusive)
+{
+ enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
+ struct rdt_resource *r = s->res;
+
+ if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
+ exclusive))
+ return true;
+
+ if (!resctrl_arch_get_cdp_enabled(r->rid))
+ return false;
+ return __rdtgroup_cbm_overlaps(r, d, cbm, closid, peer_type, exclusive);
+}
+
+/**
+ * rdtgroup_mode_test_exclusive - Test if this resource group can be exclusive
+ * @rdtgrp: Resource group identified through its closid.
+ *
+ * An exclusive resource group implies that there should be no sharing of
+ * its allocated resources. At the time this group is considered to be
+ * exclusive this test can determine if its current schemata supports this
+ * setting by testing for overlap with all other resource groups.
+ *
+ * Return: true if resource group can be exclusive, false if there is overlap
+ * with allocations of other resource groups and thus this resource group
+ * cannot be exclusive.
+ */
+static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
+{
+ int closid = rdtgrp->closid;
+ struct resctrl_schema *s;
+ struct rdt_resource *r;
+ bool has_cache = false;
+ struct rdt_domain *d;
+ u32 ctrl;
+
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
+
+ list_for_each_entry(s, &resctrl_schema_all, list) {
+ r = s->res;
+ if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
+ continue;
+ has_cache = true;
+ list_for_each_entry(d, &r->domains, list) {
+ ctrl = resctrl_arch_get_config(r, d, closid,
+ s->conf_type);
+ if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
+ rdt_last_cmd_puts("Schemata overlaps\n");
+ return false;
+ }
+ }
+ }
+
+ if (!has_cache) {
+ rdt_last_cmd_puts("Cannot be exclusive without CAT/CDP\n");
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * rdtgroup_mode_write - Modify the resource group's mode
+ */
+static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ struct rdtgroup *rdtgrp;
+ enum rdtgrp_mode mode;
+ int ret = 0;
+
+ /* Valid input requires a trailing newline */
+ if (nbytes == 0 || buf[nbytes - 1] != '\n')
+ return -EINVAL;
+ buf[nbytes - 1] = '\0';
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ rdtgroup_kn_unlock(of->kn);
+ return -ENOENT;
+ }
+
+ rdt_last_cmd_clear();
+
+ mode = rdtgrp->mode;
+
+ if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) ||
+ (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) ||
+ (!strcmp(buf, "pseudo-locksetup") &&
+ mode == RDT_MODE_PSEUDO_LOCKSETUP) ||
+ (!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED))
+ goto out;
+
+ if (mode == RDT_MODE_PSEUDO_LOCKED) {
+ rdt_last_cmd_puts("Cannot change pseudo-locked group\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (!strcmp(buf, "shareable")) {
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ ret = rdtgroup_locksetup_exit(rdtgrp);
+ if (ret)
+ goto out;
+ }
+ rdtgrp->mode = RDT_MODE_SHAREABLE;
+ } else if (!strcmp(buf, "exclusive")) {
+ if (!rdtgroup_mode_test_exclusive(rdtgrp)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ ret = rdtgroup_locksetup_exit(rdtgrp);
+ if (ret)
+ goto out;
+ }
+ rdtgrp->mode = RDT_MODE_EXCLUSIVE;
+ } else if (IS_ENABLED(CONFIG_RESCTRL_FS_PSEUDO_LOCK) &&
+ !strcmp(buf, "pseudo-locksetup")) {
+ ret = rdtgroup_locksetup_enter(rdtgrp);
+ if (ret)
+ goto out;
+ rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP;
+ } else {
+ rdt_last_cmd_puts("Unknown or unsupported mode\n");
+ ret = -EINVAL;
+ }
+
+out:
+ rdtgroup_kn_unlock(of->kn);
+ return ret ?: nbytes;
+}
+
+/**
+ * rdtgroup_cbm_to_size - Translate CBM to size in bytes
+ * @r: RDT resource to which @d belongs.
+ * @d: RDT domain instance.
+ * @cbm: bitmask for which the size should be computed.
+ *
+ * The bitmask provided associated with the RDT domain instance @d will be
+ * translated into how many bytes it represents. The size in bytes is
+ * computed by first dividing the total cache size by the CBM length to
+ * determine how many bytes each bit in the bitmask represents. The result
+ * is multiplied with the number of bits set in the bitmask.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used to make the
+ * bitmap functions work correctly.
+ */
+unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
+ struct rdt_domain *d, unsigned long cbm)
+{
+ struct cpu_cacheinfo *ci;
+ unsigned int size = 0;
+ int num_b, i;
+
+ num_b = bitmap_weight(&cbm, r->cache.cbm_len);
+ ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
+ for (i = 0; i < ci->num_leaves; i++) {
+ if (ci->info_list[i].level == r->cache_level) {
+ size = ci->info_list[i].size / r->cache.cbm_len * num_b;
+ break;
+ }
+ }
+
+ return size;
+}
+
+/*
+ * rdtgroup_size_show - Display size in bytes of allocated regions
+ *
+ * The "size" file mirrors the layout of the "schemata" file, printing the
+ * size in bytes of each region instead of the capacity bitmask.
+ */
+static int rdtgroup_size_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct resctrl_schema *schema;
+ enum resctrl_conf_type type;
+ struct rdtgroup *rdtgrp;
+ struct rdt_resource *r;
+ struct rdt_domain *d;
+ unsigned int size;
+ int ret = 0;
+ u32 closid;
+ bool sep;
+ u32 ctrl;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ rdtgroup_kn_unlock(of->kn);
+ return -ENOENT;
+ }
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+ if (!rdtgrp->plr->d) {
+ rdt_last_cmd_clear();
+ rdt_last_cmd_puts("Cache domain offline\n");
+ ret = -ENODEV;
+ } else {
+ seq_printf(s, "%*s:", max_name_width,
+ rdtgrp->plr->s->name);
+ size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
+ rdtgrp->plr->d,
+ rdtgrp->plr->cbm);
+ seq_printf(s, "%d=%u\n", rdtgrp->plr->d->id, size);
+ }
+ goto out;
+ }
+
+ closid = rdtgrp->closid;
+
+ list_for_each_entry(schema, &resctrl_schema_all, list) {
+ r = schema->res;
+ type = schema->conf_type;
+ sep = false;
+ seq_printf(s, "%*s:", max_name_width, schema->name);
+ list_for_each_entry(d, &r->domains, list) {
+ if (sep)
+ seq_putc(s, ';');
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ size = 0;
+ } else {
+ if (is_mba_sc(r))
+ ctrl = d->mbps_val[closid];
+ else
+ ctrl = resctrl_arch_get_config(r, d,
+ closid,
+ type);
+ if (r->rid == RDT_RESOURCE_MBA ||
+ r->rid == RDT_RESOURCE_SMBA)
+ size = ctrl;
+ else
+ size = rdtgroup_cbm_to_size(r, d, ctrl);
+ }
+ seq_printf(s, "%d=%u", d->id, size);
+ sep = true;
+ }
+ seq_putc(s, '\n');
+ }
+
+out:
+ rdtgroup_kn_unlock(of->kn);
+
+ return ret;
+}
+
+static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
+{
+ smp_call_function_any(&mon_info->d->cpu_mask,
+ resctrl_arch_mon_event_config_read, mon_info, 1);
+}
+
+static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
+{
+ struct resctrl_mon_config_info mon_info = {0};
+ struct rdt_domain *dom;
+ bool sep = false;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ list_for_each_entry(dom, &r->domains, list) {
+ if (sep)
+ seq_puts(s, ";");
+
+ memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
+ mon_info.r = r;
+ mon_info.d = dom;
+ mon_info.evtid = evtid;
+ mondata_config_read(&mon_info);
+
+ seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config);
+ sep = true;
+ }
+ seq_puts(s, "\n");
+
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+
+ return 0;
+}
+
+static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+
+ mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);
+
+ return 0;
+}
+
+static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+
+ mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
+
+ return 0;
+}
+
+static int mbm_config_write_domain(struct rdt_resource *r,
+ struct rdt_domain *d, u32 evtid, u32 val)
+{
+ struct resctrl_mon_config_info mon_info = {0};
+
+ /*
+ * Read the current config value first. If both are the same then
+ * no need to write it again.
+ */
+ mon_info.r = r;
+ mon_info.d = d;
+ mon_info.evtid = evtid;
+ mondata_config_read(&mon_info);
+ if (mon_info.mon_config == val)
+ return 0;
+
+ mon_info.mon_config = val;
+
+ /*
+ * Update MSR_IA32_EVT_CFG_BASE MSR on one of the CPUs in the
+ * domain. The MSRs offset from MSR MSR_IA32_EVT_CFG_BASE
+ * are scoped at the domain level. Writing any of these MSRs
+ * on one CPU is observed by all the CPUs in the domain.
+ */
+ smp_call_function_any(&d->cpu_mask, resctrl_arch_mon_event_config_write,
+ &mon_info, 1);
+ if (mon_info.err) {
+ rdt_last_cmd_puts("Invalid event configuration\n");
+ return mon_info.err;
+ }
+
+ /*
+ * When an Event Configuration is changed, the bandwidth counters
+ * for all RMIDs and Events will be cleared by the hardware. The
+ * hardware also sets MSR_IA32_QM_CTR.Unavailable (bit 62) for
+ * every RMID on the next read to any event for every RMID.
+ * Subsequent reads will have MSR_IA32_QM_CTR.Unavailable (bit 62)
+ * cleared while it is tracked by the hardware. Clear the
+ * mbm_local and mbm_total counts for all the RMIDs.
+ */
+ resctrl_arch_reset_rmid_all(r, d);
+
+ return 0;
+}
+
+static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
+{
+ char *dom_str = NULL, *id_str;
+ unsigned long dom_id, val;
+ struct rdt_domain *d;
+ int err;
+
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
+
+next:
+ if (!tok || tok[0] == '\0')
+ return 0;
+
+ /* Start processing the strings for each domain */
+ dom_str = strim(strsep(&tok, ";"));
+ id_str = strsep(&dom_str, "=");
+
+ if (!id_str || kstrtoul(id_str, 10, &dom_id)) {
+ rdt_last_cmd_puts("Missing '=' or non-numeric domain id\n");
+ return -EINVAL;
+ }
+
+ if (!dom_str || kstrtoul(dom_str, 16, &val)) {
+ rdt_last_cmd_puts("Non-numeric event configuration value\n");
+ return -EINVAL;
+ }
+
+ /* Value from user cannot be more than the supported set of events */
+ if ((val & r->mbm_cfg_mask) != val) {
+ rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
+ r->mbm_cfg_mask);
+ return -EINVAL;
+ }
+
+ list_for_each_entry(d, &r->domains, list) {
+ if (d->id == dom_id) {
+ err = mbm_config_write_domain(r, d, evtid, val);
+ if (err)
+ return err;
+ goto next;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes,
+ loff_t off)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+ int ret;
+
+ /* Valid input requires a trailing newline */
+ if (nbytes == 0 || buf[nbytes - 1] != '\n')
+ return -EINVAL;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ rdt_last_cmd_clear();
+
+ buf[nbytes - 1] = '\0';
+
+ ret = mon_config_write(r, buf, QOS_L3_MBM_TOTAL_EVENT_ID);
+
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+
+ return ret ?: nbytes;
+}
+
+static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes,
+ loff_t off)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+ int ret;
+
+ /* Valid input requires a trailing newline */
+ if (nbytes == 0 || buf[nbytes - 1] != '\n')
+ return -EINVAL;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ rdt_last_cmd_clear();
+
+ buf[nbytes - 1] = '\0';
+
+ ret = mon_config_write(r, buf, QOS_L3_MBM_LOCAL_EVENT_ID);
+
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+
+ return ret ?: nbytes;
+}
+
+/* rdtgroup information files for one cache resource. */
+static struct rftype res_common_files[] = {
+ {
+ .name = "last_cmd_status",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_last_cmd_status_show,
+ .fflags = RFTYPE_TOP_INFO,
+ },
+ {
+ .name = "num_closids",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_num_closids_show,
+ .fflags = RFTYPE_CTRL_INFO,
+ },
+ {
+ .name = "mon_features",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_mon_features_show,
+ .fflags = RFTYPE_MON_INFO,
+ },
+ {
+ .name = "num_rmids",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_num_rmids_show,
+ .fflags = RFTYPE_MON_INFO,
+ },
+ {
+ .name = "cbm_mask",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_default_ctrl_show,
+ .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+ },
+ {
+ .name = "min_cbm_bits",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_min_cbm_bits_show,
+ .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+ },
+ {
+ .name = "shareable_bits",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_shareable_bits_show,
+ .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+ },
+ {
+ .name = "bit_usage",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_bit_usage_show,
+ .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+ },
+ {
+ .name = "min_bandwidth",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_min_bw_show,
+ .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+ },
+ {
+ .name = "bandwidth_gran",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_bw_gran_show,
+ .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+ },
+ {
+ .name = "delay_linear",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_delay_linear_show,
+ .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+ },
+ /*
+ * Platform specific which (if any) capabilities are provided by
+ * thread_throttle_mode. Defer "fflags" initialization to platform
+ * discovery.
+ */
+ {
+ .name = "thread_throttle_mode",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_thread_throttle_mode_show,
+ },
+ {
+ .name = "max_threshold_occupancy",
+ .mode = 0644,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .write = max_threshold_occ_write,
+ .seq_show = max_threshold_occ_show,
+ .fflags = RFTYPE_MON_INFO | RFTYPE_RES_CACHE,
+ },
+ {
+ .name = "mbm_total_bytes_config",
+ .mode = 0644,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = mbm_total_bytes_config_show,
+ .write = mbm_total_bytes_config_write,
+ },
+ {
+ .name = "mbm_local_bytes_config",
+ .mode = 0644,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = mbm_local_bytes_config_show,
+ .write = mbm_local_bytes_config_write,
+ },
+ {
+ .name = "cpus",
+ .mode = 0644,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .write = rdtgroup_cpus_write,
+ .seq_show = rdtgroup_cpus_show,
+ .fflags = RFTYPE_BASE,
+ },
+ {
+ .name = "cpus_list",
+ .mode = 0644,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .write = rdtgroup_cpus_write,
+ .seq_show = rdtgroup_cpus_show,
+ .flags = RFTYPE_FLAGS_CPUS_LIST,
+ .fflags = RFTYPE_BASE,
+ },
+ {
+ .name = "tasks",
+ .mode = 0644,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .write = rdtgroup_tasks_write,
+ .seq_show = rdtgroup_tasks_show,
+ .fflags = RFTYPE_BASE,
+ },
+ {
+ .name = "mon_hw_id",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdtgroup_rmid_show,
+ .fflags = RFTYPE_MON_BASE | RFTYPE_DEBUG,
+ },
+ {
+ .name = "schemata",
+ .mode = 0644,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .write = rdtgroup_schemata_write,
+ .seq_show = rdtgroup_schemata_show,
+ .fflags = RFTYPE_CTRL_BASE,
+ },
+ {
+ .name = "mode",
+ .mode = 0644,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .write = rdtgroup_mode_write,
+ .seq_show = rdtgroup_mode_show,
+ .fflags = RFTYPE_CTRL_BASE,
+ },
+ {
+ .name = "size",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdtgroup_size_show,
+ .fflags = RFTYPE_CTRL_BASE,
+ },
+ {
+ .name = "sparse_masks",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_has_sparse_bitmasks_show,
+ .fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+ },
+ {
+ .name = "ctrl_hw_id",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdtgroup_closid_show,
+ .fflags = RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
+ },
+};
+
+static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags)
+{
+ struct rftype *rfts, *rft;
+ int ret, len;
+
+ rfts = res_common_files;
+ len = ARRAY_SIZE(res_common_files);
+
+ lockdep_assert_held(&rdtgroup_mutex);
+
+ if (resctrl_debug)
+ fflags |= RFTYPE_DEBUG;
+
+ for (rft = rfts; rft < rfts + len; rft++) {
+ if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) {
+ ret = rdtgroup_add_file(kn, rft);
+ if (ret)
+ goto error;
+ }
+ }
+
+ return 0;
+error:
+ pr_warn("Failed to add %s, err=%d\n", rft->name, ret);
+ while (--rft >= rfts) {
+ if ((fflags & rft->fflags) == rft->fflags)
+ kernfs_remove_by_name(kn, rft->name);
+ }
+ return ret;
+}
+
+static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
+{
+ struct rftype *rfts, *rft;
+ int len;
+
+ rfts = res_common_files;
+ len = ARRAY_SIZE(res_common_files);
+
+ for (rft = rfts; rft < rfts + len; rft++) {
+ if (!strcmp(rft->name, name))
+ return rft;
+ }
+
+ return NULL;
+}
+
+static void thread_throttle_mode_init(void)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+ struct rftype *rft;
+
+ if (!r->alloc_capable ||
+ r->membw.throttle_mode == THREAD_THROTTLE_UNDEFINED)
+ return;
+
+ rft = rdtgroup_get_rftype_by_name("thread_throttle_mode");
+ if (!rft)
+ return;
+
+ rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB;
+}
+
+void mbm_config_rftype_init(const char *config)
+{
+ struct rftype *rft;
+
+ rft = rdtgroup_get_rftype_by_name(config);
+ if (rft)
+ rft->fflags = RFTYPE_MON_INFO | RFTYPE_RES_CACHE;
+}
+
+/**
+ * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file
+ * @r: The resource group with which the file is associated.
+ * @name: Name of the file
+ *
+ * The permissions of named resctrl file, directory, or link are modified
+ * to not allow read, write, or execute by any user.
+ *
+ * WARNING: This function is intended to communicate to the user that the
+ * resctrl file has been locked down - that it is not relevant to the
+ * particular state the system finds itself in. It should not be relied
+ * on to protect from user access because after the file's permissions
+ * are restricted the user can still change the permissions using chmod
+ * from the command line.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name)
+{
+ struct iattr iattr = {.ia_valid = ATTR_MODE,};
+ struct kernfs_node *kn;
+ int ret = 0;
+
+ kn = kernfs_find_and_get_ns(r->kn, name, NULL);
+ if (!kn)
+ return -ENOENT;
+
+ switch (kernfs_type(kn)) {
+ case KERNFS_DIR:
+ iattr.ia_mode = S_IFDIR;
+ break;
+ case KERNFS_FILE:
+ iattr.ia_mode = S_IFREG;
+ break;
+ case KERNFS_LINK:
+ iattr.ia_mode = S_IFLNK;
+ break;
+ }
+
+ ret = kernfs_setattr(kn, &iattr);
+ kernfs_put(kn);
+ return ret;
+}
+
+/**
+ * rdtgroup_kn_mode_restore - Restore user access to named resctrl file
+ * @r: The resource group with which the file is associated.
+ * @name: Name of the file
+ * @mask: Mask of permissions that should be restored
+ *
+ * Restore the permissions of the named file. If @name is a directory the
+ * permissions of its parent will be used.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
+ umode_t mask)
+{
+ struct iattr iattr = {.ia_valid = ATTR_MODE,};
+ struct kernfs_node *kn, *parent;
+ struct rftype *rfts, *rft;
+ int ret, len;
+
+ rfts = res_common_files;
+ len = ARRAY_SIZE(res_common_files);
+
+ for (rft = rfts; rft < rfts + len; rft++) {
+ if (!strcmp(rft->name, name))
+ iattr.ia_mode = rft->mode & mask;
+ }
+
+ kn = kernfs_find_and_get_ns(r->kn, name, NULL);
+ if (!kn)
+ return -ENOENT;
+
+ switch (kernfs_type(kn)) {
+ case KERNFS_DIR:
+ parent = kernfs_get_parent(kn);
+ if (parent) {
+ iattr.ia_mode |= parent->mode;
+ kernfs_put(parent);
+ }
+ iattr.ia_mode |= S_IFDIR;
+ break;
+ case KERNFS_FILE:
+ iattr.ia_mode |= S_IFREG;
+ break;
+ case KERNFS_LINK:
+ iattr.ia_mode |= S_IFLNK;
+ break;
+ }
+
+ ret = kernfs_setattr(kn, &iattr);
+ kernfs_put(kn);
+ return ret;
+}
+
+static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
+ unsigned long fflags)
+{
+ struct kernfs_node *kn_subdir;
+ int ret;
+
+ kn_subdir = kernfs_create_dir(kn_info, name,
+ kn_info->mode, priv);
+ if (IS_ERR(kn_subdir))
+ return PTR_ERR(kn_subdir);
+
+ ret = rdtgroup_kn_set_ugid(kn_subdir);
+ if (ret)
+ return ret;
+
+ ret = rdtgroup_add_files(kn_subdir, fflags);
+ if (!ret)
+ kernfs_activate(kn_subdir);
+
+ return ret;
+}
+
+static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
+{
+ enum resctrl_res_level i;
+ struct resctrl_schema *s;
+ struct rdt_resource *r;
+ unsigned long fflags;
+ char name[32];
+ int ret;
+
+ /* create the directory */
+ kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL);
+ if (IS_ERR(kn_info))
+ return PTR_ERR(kn_info);
+
+ ret = rdtgroup_add_files(kn_info, RFTYPE_TOP_INFO);
+ if (ret)
+ goto out_destroy;
+
+ /* loop over enabled controls, these are all alloc_capable */
+ list_for_each_entry(s, &resctrl_schema_all, list) {
+ r = s->res;
+ fflags = r->fflags | RFTYPE_CTRL_INFO;
+ ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
+ if (ret)
+ goto out_destroy;
+ }
+
+ for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+ r = resctrl_arch_get_resource(i);
+ if (!r->mon_capable)
+ continue;
+
+ fflags = r->fflags | RFTYPE_MON_INFO;
+ sprintf(name, "%s_MON", r->name);
+ ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
+ if (ret)
+ goto out_destroy;
+ }
+
+ ret = rdtgroup_kn_set_ugid(kn_info);
+ if (ret)
+ goto out_destroy;
+
+ kernfs_activate(kn_info);
+
+ return 0;
+
+out_destroy:
+ kernfs_remove(kn_info);
+ return ret;
+}
+
+static int
+mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp,
+ char *name, struct kernfs_node **dest_kn)
+{
+ struct kernfs_node *kn;
+ int ret;
+
+ /* create the directory */
+ kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
+ if (IS_ERR(kn))
+ return PTR_ERR(kn);
+
+ if (dest_kn)
+ *dest_kn = kn;
+
+ ret = rdtgroup_kn_set_ugid(kn);
+ if (ret)
+ goto out_destroy;
+
+ kernfs_activate(kn);
+
+ return 0;
+
+out_destroy:
+ kernfs_remove(kn);
+ return ret;
+}
+
+static inline bool is_mba_linear(void)
+{
+ return resctrl_arch_get_resource(RDT_RESOURCE_MBA)->membw.delay_linear;
+}
+
+static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d)
+{
+ u32 num_closid = resctrl_arch_get_num_closid(r);
+ int cpu = cpumask_any(&d->cpu_mask);
+ int i;
+
+ d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val),
+ GFP_KERNEL, cpu_to_node(cpu));
+ if (!d->mbps_val)
+ return -ENOMEM;
+
+ for (i = 0; i < num_closid; i++)
+ d->mbps_val[i] = MBA_MAX_MBPS;
+
+ return 0;
+}
+
+static void mba_sc_domain_destroy(struct rdt_resource *r,
+ struct rdt_domain *d)
+{
+ kfree(d->mbps_val);
+ d->mbps_val = NULL;
+}
+
+/*
+ * MBA software controller is supported only if
+ * MBM is supported and MBA is in linear scale.
+ */
+static bool supports_mba_mbps(void)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+ return (resctrl_arch_is_mbm_local_enabled() &&
+ r->alloc_capable && is_mba_linear());
+}
+
+/*
+ * Enable or disable the MBA software controller
+ * which helps user specify bandwidth in MBps.
+ */
+static int set_mba_sc(bool mba_sc)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+ u32 num_closid = resctrl_arch_get_num_closid(r);
+ struct rdt_domain *d;
+ int i;
+
+ if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
+ return -EINVAL;
+
+ r->membw.mba_sc = mba_sc;
+
+ list_for_each_entry(d, &r->domains, list) {
+ for (i = 0; i < num_closid; i++)
+ d->mbps_val[i] = MBA_MAX_MBPS;
+ }
+
+ return 0;
+}
+
+/*
+ * We don't allow rdtgroup directories to be created anywhere
+ * except the root directory. Thus when looking for the rdtgroup
+ * structure for a kernfs node we are either looking at a directory,
+ * in which case the rdtgroup structure is pointed at by the "priv"
+ * field, otherwise we have a file, and need only look to the parent
+ * to find the rdtgroup.
+ */
+static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn)
+{
+ if (kernfs_type(kn) == KERNFS_DIR) {
+ /*
+ * All the resource directories use "kn->priv"
+ * to point to the "struct rdtgroup" for the
+ * resource. "info" and its subdirectories don't
+ * have rdtgroup structures, so return NULL here.
+ */
+ if (kn == kn_info || kn->parent == kn_info)
+ return NULL;
+ else
+ return kn->priv;
+ } else {
+ return kn->parent->priv;
+ }
+}
+
+static void rdtgroup_kn_get(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
+{
+ atomic_inc(&rdtgrp->waitcount);
+ kernfs_break_active_protection(kn);
+}
+
+static void rdtgroup_kn_put(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
+{
+ if (atomic_dec_and_test(&rdtgrp->waitcount) &&
+ (rdtgrp->flags & RDT_DELETED)) {
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
+ rdtgroup_pseudo_lock_remove(rdtgrp);
+ kernfs_unbreak_active_protection(kn);
+ rdtgroup_remove(rdtgrp);
+ } else {
+ kernfs_unbreak_active_protection(kn);
+ }
+}
+
+struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn)
+{
+ struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
+
+ if (!rdtgrp)
+ return NULL;
+
+ rdtgroup_kn_get(rdtgrp, kn);
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ /* Was this group deleted while we waited? */
+ if (rdtgrp->flags & RDT_DELETED)
+ return NULL;
+
+ return rdtgrp;
+}
+
+void rdtgroup_kn_unlock(struct kernfs_node *kn)
+{
+ struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
+
+ if (!rdtgrp)
+ return;
+
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+
+ rdtgroup_kn_put(rdtgrp, kn);
+}
+
+static int mkdir_mondata_all(struct kernfs_node *parent_kn,
+ struct rdtgroup *prgrp,
+ struct kernfs_node **mon_data_kn);
+
+static void rdt_disable_ctx(void)
+{
+ resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
+ resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
+ set_mba_sc(false);
+
+ resctrl_debug = false;
+}
+
+static int rdt_enable_ctx(struct rdt_fs_context *ctx)
+{
+ int ret = 0;
+
+ if (ctx->enable_cdpl2) {
+ ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true);
+ if (ret)
+ goto out_done;
+ }
+
+ if (ctx->enable_cdpl3) {
+ ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true);
+ if (ret)
+ goto out_cdpl2;
+ }
+
+ if (ctx->enable_mba_mbps) {
+ ret = set_mba_sc(true);
+ if (ret)
+ goto out_cdpl3;
+ }
+
+ if (ctx->enable_debug)
+ resctrl_debug = true;
+
+ return 0;
+
+out_cdpl3:
+ resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
+out_cdpl2:
+ resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
+out_done:
+ return ret;
+}
+
+static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type)
+{
+ struct resctrl_schema *s;
+ const char *suffix = "";
+ int ret, cl;
+
+ s = kzalloc(sizeof(*s), GFP_KERNEL);
+ if (!s)
+ return -ENOMEM;
+
+ s->res = r;
+ s->num_closid = resctrl_arch_get_num_closid(r);
+ if (resctrl_arch_get_cdp_enabled(r->rid))
+ s->num_closid /= 2;
+
+ s->conf_type = type;
+ switch (type) {
+ case CDP_CODE:
+ suffix = "CODE";
+ break;
+ case CDP_DATA:
+ suffix = "DATA";
+ break;
+ case CDP_NONE:
+ suffix = "";
+ break;
+ }
+
+ ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix);
+ if (ret >= sizeof(s->name)) {
+ kfree(s);
+ return -EINVAL;
+ }
+
+ cl = strlen(s->name);
+
+ /*
+ * If CDP is supported by this resource, but not enabled,
+ * include the suffix. This ensures the tabular format of the
+ * schemata file does not change between mounts of the filesystem.
+ */
+ if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
+ cl += 4;
+
+ if (cl > max_name_width)
+ max_name_width = cl;
+
+ /*
+ * Choose a width for the resource data based on the resource that has
+ * widest name and CBM.
+ */
+ max_data_width = max(max_data_width, r->data_width);
+
+ INIT_LIST_HEAD(&s->list);
+ list_add(&s->list, &resctrl_schema_all);
+
+ return 0;
+}
+
+static int schemata_list_create(void)
+{
+ enum resctrl_res_level i;
+ struct rdt_resource *r;
+ int ret = 0;
+
+ for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+ r = resctrl_arch_get_resource(i);
+ if (!r->alloc_capable)
+ continue;
+
+ if (resctrl_arch_get_cdp_enabled(r->rid)) {
+ ret = schemata_list_add(r, CDP_CODE);
+ if (ret)
+ break;
+
+ ret = schemata_list_add(r, CDP_DATA);
+ } else {
+ ret = schemata_list_add(r, CDP_NONE);
+ }
+
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+static void schemata_list_destroy(void)
+{
+ struct resctrl_schema *s, *tmp;
+
+ list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) {
+ list_del(&s->list);
+ kfree(s);
+ }
+}
+
+static int rdt_get_tree(struct fs_context *fc)
+{
+ struct rdt_fs_context *ctx = rdt_fc2context(fc);
+ unsigned long flags = RFTYPE_CTRL_BASE;
+ struct rdt_domain *dom;
+ struct rdt_resource *r;
+ int ret;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+ /*
+ * resctrl file system can only be mounted once.
+ */
+ if (resctrl_mounted) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ ret = rdtgroup_setup_root(ctx);
+ if (ret)
+ goto out;
+
+ ret = rdt_enable_ctx(ctx);
+ if (ret)
+ goto out_root;
+
+ ret = schemata_list_create();
+ if (ret) {
+ schemata_list_destroy();
+ goto out_ctx;
+ }
+
+ closid_init();
+
+ if (resctrl_arch_mon_capable())
+ flags |= RFTYPE_MON;
+
+ ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
+ if (ret)
+ goto out_schemata_free;
+
+ kernfs_activate(rdtgroup_default.kn);
+
+ ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
+ if (ret < 0)
+ goto out_schemata_free;
+
+ if (resctrl_arch_mon_capable()) {
+ ret = mongroup_create_dir(rdtgroup_default.kn,
+ &rdtgroup_default, "mon_groups",
+ &kn_mongrp);
+ if (ret < 0)
+ goto out_info;
+
+ ret = mkdir_mondata_all(rdtgroup_default.kn,
+ &rdtgroup_default, &kn_mondata);
+ if (ret < 0)
+ goto out_mongrp;
+ rdtgroup_default.mon.mon_data_kn = kn_mondata;
+ }
+
+ ret = rdt_pseudo_lock_init();
+ if (ret)
+ goto out_mondata;
+
+ ret = kernfs_get_tree(fc);
+ if (ret < 0)
+ goto out_psl;
+
+ if (resctrl_arch_alloc_capable())
+ resctrl_arch_enable_alloc();
+ if (resctrl_arch_mon_capable())
+ resctrl_arch_enable_mon();
+
+ if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
+ resctrl_mounted = true;
+
+ if (resctrl_is_mbm_enabled()) {
+ r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+ list_for_each_entry(dom, &r->domains, list)
+ mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
+ RESCTRL_PICK_ANY_CPU);
+ }
+
+ goto out;
+
+out_psl:
+ rdt_pseudo_lock_release();
+out_mondata:
+ if (resctrl_arch_mon_capable())
+ kernfs_remove(kn_mondata);
+out_mongrp:
+ if (resctrl_arch_mon_capable())
+ kernfs_remove(kn_mongrp);
+out_info:
+ kernfs_remove(kn_info);
+out_schemata_free:
+ schemata_list_destroy();
+out_ctx:
+ rdt_disable_ctx();
+out_root:
+ rdtgroup_destroy_root();
+out:
+ rdt_last_cmd_clear();
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+ return ret;
+}
+
+enum rdt_param {
+ Opt_cdp,
+ Opt_cdpl2,
+ Opt_mba_mbps,
+ Opt_debug,
+ nr__rdt_params
+};
+
+static const struct fs_parameter_spec rdt_fs_parameters[] = {
+ fsparam_flag("cdp", Opt_cdp),
+ fsparam_flag("cdpl2", Opt_cdpl2),
+ fsparam_flag("mba_MBps", Opt_mba_mbps),
+ fsparam_flag("debug", Opt_debug),
+ {}
+};
+
+static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct rdt_fs_context *ctx = rdt_fc2context(fc);
+ struct fs_parse_result result;
+ int opt;
+
+ opt = fs_parse(fc, rdt_fs_parameters, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_cdp:
+ ctx->enable_cdpl3 = true;
+ return 0;
+ case Opt_cdpl2:
+ ctx->enable_cdpl2 = true;
+ return 0;
+ case Opt_mba_mbps:
+ if (!supports_mba_mbps())
+ return -EINVAL;
+ ctx->enable_mba_mbps = true;
+ return 0;
+ case Opt_debug:
+ ctx->enable_debug = true;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static void rdt_fs_context_free(struct fs_context *fc)
+{
+ struct rdt_fs_context *ctx = rdt_fc2context(fc);
+
+ kernfs_free_fs_context(fc);
+ kfree(ctx);
+}
+
+static const struct fs_context_operations rdt_fs_context_ops = {
+ .free = rdt_fs_context_free,
+ .parse_param = rdt_parse_param,
+ .get_tree = rdt_get_tree,
+};
+
+static int rdt_init_fs_context(struct fs_context *fc)
+{
+ struct rdt_fs_context *ctx;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->kfc.magic = RDTGROUP_SUPER_MAGIC;
+ fc->fs_private = &ctx->kfc;
+ fc->ops = &rdt_fs_context_ops;
+ put_user_ns(fc->user_ns);
+ fc->user_ns = get_user_ns(&init_user_ns);
+ fc->global = true;
+ return 0;
+}
+
+/*
+ * Move tasks from one to the other group. If @from is NULL, then all tasks
+ * in the systems are moved unconditionally (used for teardown).
+ *
+ * If @mask is not NULL the cpus on which moved tasks are running are set
+ * in that mask so the update smp function call is restricted to affected
+ * cpus.
+ */
+static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to,
+ struct cpumask *mask)
+{
+ struct task_struct *p, *t;
+
+ read_lock(&tasklist_lock);
+ for_each_process_thread(p, t) {
+ if (!from || is_closid_match(t, from) ||
+ is_rmid_match(t, from)) {
+ resctrl_arch_set_closid_rmid(t, to->closid,
+ to->mon.rmid);
+
+ /*
+ * Order the closid/rmid stores above before the loads
+ * in task_curr(). This pairs with the full barrier
+ * between the rq->curr update and
+ * resctrl_arch_sched_in() during context switch.
+ */
+ smp_mb();
+
+ /*
+ * If the task is on a CPU, set the CPU in the mask.
+ * The detection is inaccurate as tasks might move or
+ * schedule before the smp function call takes place.
+ * In such a case the function call is pointless, but
+ * there is no other side effect.
+ */
+ if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t))
+ cpumask_set_cpu(task_cpu(t), mask);
+ }
+ }
+ read_unlock(&tasklist_lock);
+}
+
+static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp)
+{
+ struct rdtgroup *sentry, *stmp;
+ struct list_head *head;
+
+ head = &rdtgrp->mon.crdtgrp_list;
+ list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) {
+ free_rmid(sentry->closid, sentry->mon.rmid);
+ list_del(&sentry->mon.crdtgrp_list);
+
+ if (atomic_read(&sentry->waitcount) != 0)
+ sentry->flags = RDT_DELETED;
+ else
+ rdtgroup_remove(sentry);
+ }
+}
+
+/*
+ * Forcibly remove all of subdirectories under root.
+ */
+static void rmdir_all_sub(void)
+{
+ struct rdtgroup *rdtgrp, *tmp;
+
+ /* Move all tasks to the default resource group */
+ rdt_move_group_tasks(NULL, &rdtgroup_default, NULL);
+
+ list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) {
+ /* Free any child rmids */
+ free_all_child_rdtgrp(rdtgrp);
+
+ /* Remove each rdtgroup other than root */
+ if (rdtgrp == &rdtgroup_default)
+ continue;
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
+ rdtgroup_pseudo_lock_remove(rdtgrp);
+
+ /*
+ * Give any CPUs back to the default group. We cannot copy
+ * cpu_online_mask because a CPU might have executed the
+ * offline callback already, but is still marked online.
+ */
+ cpumask_or(&rdtgroup_default.cpu_mask,
+ &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
+
+ free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+ kernfs_remove(rdtgrp->kn);
+ list_del(&rdtgrp->rdtgroup_list);
+
+ if (atomic_read(&rdtgrp->waitcount) != 0)
+ rdtgrp->flags = RDT_DELETED;
+ else
+ rdtgroup_remove(rdtgrp);
+ }
+ /* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */
+ update_closid_rmid(cpu_online_mask, &rdtgroup_default);
+
+ kernfs_remove(kn_info);
+ kernfs_remove(kn_mongrp);
+ kernfs_remove(kn_mondata);
+}
+
+static void rdt_kill_sb(struct super_block *sb)
+{
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ rdt_disable_ctx();
+
+ /* Put everything back to default values. */
+ resctrl_arch_reset_resources();
+
+ rmdir_all_sub();
+ rdt_pseudo_lock_release();
+ rdtgroup_default.mode = RDT_MODE_SHAREABLE;
+ schemata_list_destroy();
+ rdtgroup_destroy_root();
+ if (resctrl_arch_alloc_capable())
+ resctrl_arch_disable_alloc();
+ if (resctrl_arch_mon_capable())
+ resctrl_arch_disable_mon();
+ resctrl_mounted = false;
+ kernfs_kill_sb(sb);
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+}
+
+static struct file_system_type rdt_fs_type = {
+ .name = "resctrl",
+ .init_fs_context = rdt_init_fs_context,
+ .parameters = rdt_fs_parameters,
+ .kill_sb = rdt_kill_sb,
+};
+
+static int mon_addfile(struct kernfs_node *parent_kn, const char *name,
+ void *priv)
+{
+ struct kernfs_node *kn;
+ int ret = 0;
+
+ kn = __kernfs_create_file(parent_kn, name, 0444,
+ GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0,
+ &kf_mondata_ops, priv, NULL, NULL);
+ if (IS_ERR(kn))
+ return PTR_ERR(kn);
+
+ ret = rdtgroup_kn_set_ugid(kn);
+ if (ret) {
+ kernfs_remove(kn);
+ return ret;
+ }
+
+ return ret;
+}
+
+/*
+ * Remove all subdirectories of mon_data of ctrl_mon groups
+ * and monitor groups with given domain id.
+ */
+static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
+ unsigned int dom_id)
+{
+ struct rdtgroup *prgrp, *crgrp;
+ char name[32];
+
+ list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+ sprintf(name, "mon_%s_%02d", r->name, dom_id);
+ kernfs_remove_by_name(prgrp->mon.mon_data_kn, name);
+
+ list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
+ kernfs_remove_by_name(crgrp->mon.mon_data_kn, name);
+ }
+}
+
+static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
+ struct rdt_domain *d,
+ struct rdt_resource *r, struct rdtgroup *prgrp)
+{
+ union mon_data_bits priv;
+ struct kernfs_node *kn;
+ struct mon_evt *mevt;
+ struct rmid_read rr;
+ char name[32];
+ int ret;
+
+ sprintf(name, "mon_%s_%02d", r->name, d->id);
+ /* create the directory */
+ kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
+ if (IS_ERR(kn))
+ return PTR_ERR(kn);
+
+ ret = rdtgroup_kn_set_ugid(kn);
+ if (ret)
+ goto out_destroy;
+
+ if (WARN_ON(list_empty(&r->evt_list))) {
+ ret = -EPERM;
+ goto out_destroy;
+ }
+
+ priv.u.rid = r->rid;
+ priv.u.domid = d->id;
+ list_for_each_entry(mevt, &r->evt_list, list) {
+ priv.u.evtid = mevt->evtid;
+ ret = mon_addfile(kn, mevt->name, priv.priv);
+ if (ret)
+ goto out_destroy;
+
+ if (resctrl_is_mbm_event(mevt->evtid))
+ mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
+ }
+ kernfs_activate(kn);
+ return 0;
+
+out_destroy:
+ kernfs_remove(kn);
+ return ret;
+}
+
+/*
+ * Add all subdirectories of mon_data for "ctrl_mon" groups
+ * and "monitor" groups with given domain id.
+ */
+static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
+ struct rdt_domain *d)
+{
+ struct kernfs_node *parent_kn;
+ struct rdtgroup *prgrp, *crgrp;
+ struct list_head *head;
+
+ list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+ parent_kn = prgrp->mon.mon_data_kn;
+ mkdir_mondata_subdir(parent_kn, d, r, prgrp);
+
+ head = &prgrp->mon.crdtgrp_list;
+ list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+ parent_kn = crgrp->mon.mon_data_kn;
+ mkdir_mondata_subdir(parent_kn, d, r, crgrp);
+ }
+ }
+}
+
+static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
+ struct rdt_resource *r,
+ struct rdtgroup *prgrp)
+{
+ struct rdt_domain *dom;
+ int ret;
+
+ /* Walking r->domains, ensure it can't race with cpuhp */
+ lockdep_assert_cpus_held();
+
+ list_for_each_entry(dom, &r->domains, list) {
+ ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * This creates a directory mon_data which contains the monitored data.
+ *
+ * mon_data has one directory for each domain which are named
+ * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data
+ * with L3 domain looks as below:
+ * ./mon_data:
+ * mon_L3_00
+ * mon_L3_01
+ * mon_L3_02
+ * ...
+ *
+ * Each domain directory has one file per event:
+ * ./mon_L3_00/:
+ * llc_occupancy
+ *
+ */
+static int mkdir_mondata_all(struct kernfs_node *parent_kn,
+ struct rdtgroup *prgrp,
+ struct kernfs_node **dest_kn)
+{
+ enum resctrl_res_level i;
+ struct rdt_resource *r;
+ struct kernfs_node *kn;
+ int ret;
+
+ /*
+ * Create the mon_data directory first.
+ */
+ ret = mongroup_create_dir(parent_kn, prgrp, "mon_data", &kn);
+ if (ret)
+ return ret;
+
+ if (dest_kn)
+ *dest_kn = kn;
+
+ /*
+ * Create the subdirectories for each domain. Note that all events
+ * in a domain like L3 are grouped into a resource whose domain is L3
+ */
+ for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+ r = resctrl_arch_get_resource(i);
+ if (!r->mon_capable)
+ continue;
+
+ ret = mkdir_mondata_subdir_alldom(kn, r, prgrp);
+ if (ret)
+ goto out_destroy;
+ }
+
+ return 0;
+
+out_destroy:
+ kernfs_remove(kn);
+ return ret;
+}
+
+/**
+ * cbm_ensure_valid - Enforce validity on provided CBM
+ * @_val: Candidate CBM
+ * @r: RDT resource to which the CBM belongs
+ *
+ * The provided CBM represents all cache portions available for use. This
+ * may be represented by a bitmap that does not consist of contiguous ones
+ * and thus be an invalid CBM.
+ * Here the provided CBM is forced to be a valid CBM by only considering
+ * the first set of contiguous bits as valid and clearing all bits.
+ * The intention here is to provide a valid default CBM with which a new
+ * resource group is initialized. The user can follow this with a
+ * modification to the CBM if the default does not satisfy the
+ * requirements.
+ */
+static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
+{
+ unsigned int cbm_len = r->cache.cbm_len;
+ unsigned long first_bit, zero_bit;
+ unsigned long val = _val;
+
+ if (!val)
+ return 0;
+
+ first_bit = find_first_bit(&val, cbm_len);
+ zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
+
+ /* Clear any remaining bits to ensure contiguous region */
+ bitmap_clear(&val, zero_bit, cbm_len - zero_bit);
+ return (u32)val;
+}
+
+/*
+ * Initialize cache resources per RDT domain
+ *
+ * Set the RDT domain up to start off with all usable allocations. That is,
+ * all shareable and unused bits. All-zero CBM is invalid.
+ */
+static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
+ u32 closid)
+{
+ enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
+ enum resctrl_conf_type t = s->conf_type;
+ struct resctrl_staged_config *cfg;
+ struct rdt_resource *r = s->res;
+ u32 used_b = 0, unused_b = 0;
+ unsigned long tmp_cbm;
+ enum rdtgrp_mode mode;
+ u32 peer_ctl, ctrl_val;
+ int i;
+
+ cfg = &d->staged_config[t];
+ cfg->have_new_ctrl = false;
+ cfg->new_ctrl = r->cache.shareable_bits;
+ used_b = r->cache.shareable_bits;
+ for (i = 0; i < closids_supported(); i++) {
+ if (closid_allocated(i) && i != closid) {
+ mode = rdtgroup_mode_by_closid(i);
+ if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
+ /*
+ * ctrl values for locksetup aren't relevant
+ * until the schemata is written, and the mode
+ * becomes RDT_MODE_PSEUDO_LOCKED.
+ */
+ continue;
+ /*
+ * If CDP is active include peer domain's
+ * usage to ensure there is no overlap
+ * with an exclusive group.
+ */
+ if (resctrl_arch_get_cdp_enabled(r->rid))
+ peer_ctl = resctrl_arch_get_config(r, d, i,
+ peer_type);
+ else
+ peer_ctl = 0;
+ ctrl_val = resctrl_arch_get_config(r, d, i,
+ s->conf_type);
+ used_b |= ctrl_val | peer_ctl;
+ if (mode == RDT_MODE_SHAREABLE)
+ cfg->new_ctrl |= ctrl_val | peer_ctl;
+ }
+ }
+ if (d->plr && d->plr->cbm > 0)
+ used_b |= d->plr->cbm;
+ unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1);
+ unused_b &= BIT_MASK(r->cache.cbm_len) - 1;
+ cfg->new_ctrl |= unused_b;
+ /*
+ * Force the initial CBM to be valid, user can
+ * modify the CBM based on system availability.
+ */
+ cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r);
+ /*
+ * Assign the u32 CBM to an unsigned long to ensure that
+ * bitmap_weight() does not access out-of-bound memory.
+ */
+ tmp_cbm = cfg->new_ctrl;
+ if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
+ rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
+ return -ENOSPC;
+ }
+ cfg->have_new_ctrl = true;
+
+ return 0;
+}
+
+/*
+ * Initialize cache resources with default values.
+ *
+ * A new RDT group is being created on an allocation capable (CAT)
+ * supporting system. Set this group up to start off with all usable
+ * allocations.
+ *
+ * If there are no more shareable bits available on any domain then
+ * the entire allocation will fail.
+ */
+static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
+{
+ struct rdt_domain *d;
+ int ret;
+
+ list_for_each_entry(d, &s->res->domains, list) {
+ ret = __init_one_rdt_domain(d, s, closid);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/* Initialize MBA resource with default values. */
+static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
+{
+ struct resctrl_staged_config *cfg;
+ struct rdt_domain *d;
+
+ list_for_each_entry(d, &r->domains, list) {
+ if (is_mba_sc(r)) {
+ d->mbps_val[closid] = MBA_MAX_MBPS;
+ continue;
+ }
+
+ cfg = &d->staged_config[CDP_NONE];
+ cfg->new_ctrl = r->default_ctrl;
+ cfg->have_new_ctrl = true;
+ }
+}
+
+/* Initialize the RDT group's allocations. */
+static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
+{
+ struct resctrl_schema *s;
+ struct rdt_resource *r;
+ int ret = 0;
+
+ rdt_staged_configs_clear();
+
+ list_for_each_entry(s, &resctrl_schema_all, list) {
+ r = s->res;
+ if (r->rid == RDT_RESOURCE_MBA ||
+ r->rid == RDT_RESOURCE_SMBA) {
+ rdtgroup_init_mba(r, rdtgrp->closid);
+ if (is_mba_sc(r))
+ continue;
+ } else {
+ ret = rdtgroup_init_cat(s, rdtgrp->closid);
+ if (ret < 0)
+ goto out;
+ }
+
+ ret = resctrl_arch_update_domains(r, rdtgrp->closid);
+ if (ret < 0) {
+ rdt_last_cmd_puts("Failed to initialize allocations\n");
+ goto out;
+ }
+ }
+
+ rdtgrp->mode = RDT_MODE_SHAREABLE;
+
+out:
+ rdt_staged_configs_clear();
+ return ret;
+}
+
+static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)
+{
+ int ret;
+
+ if (!resctrl_arch_mon_capable())
+ return 0;
+
+ ret = alloc_rmid(rdtgrp->closid);
+ if (ret < 0) {
+ rdt_last_cmd_puts("Out of RMIDs\n");
+ return ret;
+ }
+ rdtgrp->mon.rmid = ret;
+
+ ret = mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
+ if (ret) {
+ rdt_last_cmd_puts("kernfs subdir error\n");
+ free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void mkdir_rdt_prepare_rmid_free(struct rdtgroup *rgrp)
+{
+ if (resctrl_arch_mon_capable())
+ free_rmid(rgrp->closid, rgrp->mon.rmid);
+}
+
+static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
+ const char *name, umode_t mode,
+ enum rdt_group_type rtype, struct rdtgroup **r)
+{
+ struct rdtgroup *prdtgrp, *rdtgrp;
+ unsigned long files = 0;
+ struct kernfs_node *kn;
+ int ret;
+
+ prdtgrp = rdtgroup_kn_lock_live(parent_kn);
+ if (!prdtgrp) {
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+
+ if (rtype == RDTMON_GROUP &&
+ (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+ prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) {
+ ret = -EINVAL;
+ rdt_last_cmd_puts("Pseudo-locking in progress\n");
+ goto out_unlock;
+ }
+
+ /* allocate the rdtgroup. */
+ rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL);
+ if (!rdtgrp) {
+ ret = -ENOSPC;
+ rdt_last_cmd_puts("Kernel out of memory\n");
+ goto out_unlock;
+ }
+ *r = rdtgrp;
+ rdtgrp->mon.parent = prdtgrp;
+ rdtgrp->type = rtype;
+ INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list);
+
+ /* kernfs creates the directory for rdtgrp */
+ kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp);
+ if (IS_ERR(kn)) {
+ ret = PTR_ERR(kn);
+ rdt_last_cmd_puts("kernfs create error\n");
+ goto out_free_rgrp;
+ }
+ rdtgrp->kn = kn;
+
+ /*
+ * kernfs_remove() will drop the reference count on "kn" which
+ * will free it. But we still need it to stick around for the
+ * rdtgroup_kn_unlock(kn) call. Take one extra reference here,
+ * which will be dropped by kernfs_put() in rdtgroup_remove().
+ */
+ kernfs_get(kn);
+
+ ret = rdtgroup_kn_set_ugid(kn);
+ if (ret) {
+ rdt_last_cmd_puts("kernfs perm error\n");
+ goto out_destroy;
+ }
+
+ if (rtype == RDTCTRL_GROUP) {
+ files = RFTYPE_BASE | RFTYPE_CTRL;
+ if (resctrl_arch_mon_capable())
+ files |= RFTYPE_MON;
+ } else {
+ files = RFTYPE_BASE | RFTYPE_MON;
+ }
+
+ ret = rdtgroup_add_files(kn, files);
+ if (ret) {
+ rdt_last_cmd_puts("kernfs fill error\n");
+ goto out_destroy;
+ }
+
+ /*
+ * The caller unlocks the parent_kn upon success.
+ */
+ return 0;
+
+out_destroy:
+ kernfs_put(rdtgrp->kn);
+ kernfs_remove(rdtgrp->kn);
+out_free_rgrp:
+ kfree(rdtgrp);
+out_unlock:
+ rdtgroup_kn_unlock(parent_kn);
+ return ret;
+}
+
+static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp)
+{
+ kernfs_remove(rgrp->kn);
+ rdtgroup_remove(rgrp);
+}
+
+/*
+ * Create a monitor group under "mon_groups" directory of a control
+ * and monitor group(ctrl_mon). This is a resource group
+ * to monitor a subset of tasks and cpus in its parent ctrl_mon group.
+ */
+static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn,
+ const char *name, umode_t mode)
+{
+ struct rdtgroup *rdtgrp, *prgrp;
+ int ret;
+
+ ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTMON_GROUP, &rdtgrp);
+ if (ret)
+ return ret;
+
+ prgrp = rdtgrp->mon.parent;
+ rdtgrp->closid = prgrp->closid;
+
+ ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
+ if (ret) {
+ mkdir_rdt_prepare_clean(rdtgrp);
+ goto out_unlock;
+ }
+
+ kernfs_activate(rdtgrp->kn);
+
+ /*
+ * Add the rdtgrp to the list of rdtgrps the parent
+ * ctrl_mon group has to track.
+ */
+ list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list);
+
+out_unlock:
+ rdtgroup_kn_unlock(parent_kn);
+ return ret;
+}
+
+/*
+ * These are rdtgroups created under the root directory. Can be used
+ * to allocate and monitor resources.
+ */
+static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
+ const char *name, umode_t mode)
+{
+ struct rdtgroup *rdtgrp;
+ struct kernfs_node *kn;
+ u32 closid;
+ int ret;
+
+ ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTCTRL_GROUP, &rdtgrp);
+ if (ret)
+ return ret;
+
+ kn = rdtgrp->kn;
+ ret = closid_alloc();
+ if (ret < 0) {
+ rdt_last_cmd_puts("Out of CLOSIDs\n");
+ goto out_common_fail;
+ }
+ closid = ret;
+ ret = 0;
+
+ rdtgrp->closid = closid;
+
+ ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
+ if (ret)
+ goto out_closid_free;
+
+ kernfs_activate(rdtgrp->kn);
+
+ ret = rdtgroup_init_alloc(rdtgrp);
+ if (ret < 0)
+ goto out_rmid_free;
+
+ list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
+
+ if (resctrl_arch_mon_capable()) {
+ /*
+ * Create an empty mon_groups directory to hold the subset
+ * of tasks and cpus to monitor.
+ */
+ ret = mongroup_create_dir(kn, rdtgrp, "mon_groups", NULL);
+ if (ret) {
+ rdt_last_cmd_puts("kernfs subdir error\n");
+ goto out_del_list;
+ }
+ }
+
+ goto out_unlock;
+
+out_del_list:
+ list_del(&rdtgrp->rdtgroup_list);
+out_rmid_free:
+ mkdir_rdt_prepare_rmid_free(rdtgrp);
+out_closid_free:
+ closid_free(closid);
+out_common_fail:
+ mkdir_rdt_prepare_clean(rdtgrp);
+out_unlock:
+ rdtgroup_kn_unlock(parent_kn);
+ return ret;
+}
+
+/*
+ * We allow creating mon groups only with in a directory called "mon_groups"
+ * which is present in every ctrl_mon group. Check if this is a valid
+ * "mon_groups" directory.
+ *
+ * 1. The directory should be named "mon_groups".
+ * 2. The mon group itself should "not" be named "mon_groups".
+ * This makes sure "mon_groups" directory always has a ctrl_mon group
+ * as parent.
+ */
+static bool is_mon_groups(struct kernfs_node *kn, const char *name)
+{
+ return (!strcmp(kn->name, "mon_groups") &&
+ strcmp(name, "mon_groups"));
+}
+
+static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
+ umode_t mode)
+{
+ /* Do not accept '\n' to avoid unparsable situation. */
+ if (strchr(name, '\n'))
+ return -EINVAL;
+
+ /*
+ * If the parent directory is the root directory and RDT
+ * allocation is supported, add a control and monitoring
+ * subdirectory
+ */
+ if (resctrl_arch_alloc_capable() && parent_kn == rdtgroup_default.kn)
+ return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode);
+
+ /*
+ * If RDT monitoring is supported and the parent directory is a valid
+ * "mon_groups" directory, add a monitoring subdirectory.
+ */
+ if (resctrl_arch_mon_capable() && is_mon_groups(parent_kn, name))
+ return rdtgroup_mkdir_mon(parent_kn, name, mode);
+
+ return -EPERM;
+}
+
+static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
+{
+ struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
+ u32 closid, rmid;
+ int cpu;
+
+ /* Give any tasks back to the parent group */
+ rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
+
+ /*
+ * Update per cpu closid/rmid of the moved CPUs first.
+ * Note: the closid will not change, but the arch code still needs it.
+ */
+ closid = prdtgrp->closid;
+ rmid = prdtgrp->mon.rmid;
+ for_each_cpu(cpu, &rdtgrp->cpu_mask)
+ resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
+
+ /*
+ * Update the MSR on moved CPUs and CPUs which have moved
+ * task running on them.
+ */
+ cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
+ update_closid_rmid(tmpmask, NULL);
+
+ rdtgrp->flags = RDT_DELETED;
+ free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+ /*
+ * Remove the rdtgrp from the parent ctrl_mon group's list
+ */
+ WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
+ list_del(&rdtgrp->mon.crdtgrp_list);
+
+ kernfs_remove(rdtgrp->kn);
+
+ return 0;
+}
+
+static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp)
+{
+ rdtgrp->flags = RDT_DELETED;
+ list_del(&rdtgrp->rdtgroup_list);
+
+ kernfs_remove(rdtgrp->kn);
+ return 0;
+}
+
+static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
+{
+ u32 closid, rmid;
+ int cpu;
+
+ /* Give any tasks back to the default group */
+ rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask);
+
+ /* Give any CPUs back to the default group */
+ cpumask_or(&rdtgroup_default.cpu_mask,
+ &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
+
+ /* Update per cpu closid and rmid of the moved CPUs first */
+ closid = rdtgroup_default.closid;
+ rmid = rdtgroup_default.mon.rmid;
+ for_each_cpu(cpu, &rdtgrp->cpu_mask)
+ resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
+
+ /*
+ * Update the MSR on moved CPUs and CPUs which have moved
+ * task running on them.
+ */
+ cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
+ update_closid_rmid(tmpmask, NULL);
+
+ free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+ closid_free(rdtgrp->closid);
+
+ rdtgroup_ctrl_remove(rdtgrp);
+
+ /*
+ * Free all the child monitor group rmids.
+ */
+ free_all_child_rdtgrp(rdtgrp);
+
+ return 0;
+}
+
+static int rdtgroup_rmdir(struct kernfs_node *kn)
+{
+ struct kernfs_node *parent_kn = kn->parent;
+ struct rdtgroup *rdtgrp;
+ cpumask_var_t tmpmask;
+ int ret = 0;
+
+ if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
+ return -ENOMEM;
+
+ rdtgrp = rdtgroup_kn_lock_live(kn);
+ if (!rdtgrp) {
+ ret = -EPERM;
+ goto out;
+ }
+
+ /*
+ * If the rdtgroup is a ctrl_mon group and parent directory
+ * is the root directory, remove the ctrl_mon group.
+ *
+ * If the rdtgroup is a mon group and parent directory
+ * is a valid "mon_groups" directory, remove the mon group.
+ */
+ if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn &&
+ rdtgrp != &rdtgroup_default) {
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+ ret = rdtgroup_ctrl_remove(rdtgrp);
+ } else {
+ ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask);
+ }
+ } else if (rdtgrp->type == RDTMON_GROUP &&
+ is_mon_groups(parent_kn, kn->name)) {
+ ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask);
+ } else {
+ ret = -EPERM;
+ }
+
+out:
+ rdtgroup_kn_unlock(kn);
+ free_cpumask_var(tmpmask);
+ return ret;
+}
+
+/**
+ * mongrp_reparent() - replace parent CTRL_MON group of a MON group
+ * @rdtgrp: the MON group whose parent should be replaced
+ * @new_prdtgrp: replacement parent CTRL_MON group for @rdtgrp
+ * @cpus: cpumask provided by the caller for use during this call
+ *
+ * Replaces the parent CTRL_MON group for a MON group, resulting in all member
+ * tasks' CLOSID immediately changing to that of the new parent group.
+ * Monitoring data for the group is unaffected by this operation.
+ */
+static void mongrp_reparent(struct rdtgroup *rdtgrp,
+ struct rdtgroup *new_prdtgrp,
+ cpumask_var_t cpus)
+{
+ struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
+
+ WARN_ON(rdtgrp->type != RDTMON_GROUP);
+ WARN_ON(new_prdtgrp->type != RDTCTRL_GROUP);
+
+ /* Nothing to do when simply renaming a MON group. */
+ if (prdtgrp == new_prdtgrp)
+ return;
+
+ WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
+ list_move_tail(&rdtgrp->mon.crdtgrp_list,
+ &new_prdtgrp->mon.crdtgrp_list);
+
+ rdtgrp->mon.parent = new_prdtgrp;
+ rdtgrp->closid = new_prdtgrp->closid;
+
+ /* Propagate updated closid to all tasks in this group. */
+ rdt_move_group_tasks(rdtgrp, rdtgrp, cpus);
+
+ update_closid_rmid(cpus, NULL);
+}
+
+static int rdtgroup_rename(struct kernfs_node *kn,
+ struct kernfs_node *new_parent, const char *new_name)
+{
+ struct rdtgroup *new_prdtgrp;
+ struct rdtgroup *rdtgrp;
+ cpumask_var_t tmpmask;
+ int ret;
+
+ rdtgrp = kernfs_to_rdtgroup(kn);
+ new_prdtgrp = kernfs_to_rdtgroup(new_parent);
+ if (!rdtgrp || !new_prdtgrp)
+ return -ENOENT;
+
+ /* Release both kernfs active_refs before obtaining rdtgroup mutex. */
+ rdtgroup_kn_get(rdtgrp, kn);
+ rdtgroup_kn_get(new_prdtgrp, new_parent);
+
+ mutex_lock(&rdtgroup_mutex);
+
+ rdt_last_cmd_clear();
+
+ /*
+ * Don't allow kernfs_to_rdtgroup() to return a parent rdtgroup if
+ * either kernfs_node is a file.
+ */
+ if (kernfs_type(kn) != KERNFS_DIR ||
+ kernfs_type(new_parent) != KERNFS_DIR) {
+ rdt_last_cmd_puts("Source and destination must be directories");
+ ret = -EPERM;
+ goto out;
+ }
+
+ if ((rdtgrp->flags & RDT_DELETED) || (new_prdtgrp->flags & RDT_DELETED)) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ if (rdtgrp->type != RDTMON_GROUP || !kn->parent ||
+ !is_mon_groups(kn->parent, kn->name)) {
+ rdt_last_cmd_puts("Source must be a MON group\n");
+ ret = -EPERM;
+ goto out;
+ }
+
+ if (!is_mon_groups(new_parent, new_name)) {
+ rdt_last_cmd_puts("Destination must be a mon_groups subdirectory\n");
+ ret = -EPERM;
+ goto out;
+ }
+
+ /*
+ * If the MON group is monitoring CPUs, the CPUs must be assigned to the
+ * current parent CTRL_MON group and therefore cannot be assigned to
+ * the new parent, making the move illegal.
+ */
+ if (!cpumask_empty(&rdtgrp->cpu_mask) &&
+ rdtgrp->mon.parent != new_prdtgrp) {
+ rdt_last_cmd_puts("Cannot move a MON group that monitors CPUs\n");
+ ret = -EPERM;
+ goto out;
+ }
+
+ /*
+ * Allocate the cpumask for use in mongrp_reparent() to avoid the
+ * possibility of failing to allocate it after kernfs_rename() has
+ * succeeded.
+ */
+ if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /*
+ * Perform all input validation and allocations needed to ensure
+ * mongrp_reparent() will succeed before calling kernfs_rename(),
+ * otherwise it would be necessary to revert this call if
+ * mongrp_reparent() failed.
+ */
+ ret = kernfs_rename(kn, new_parent, new_name);
+ if (!ret)
+ mongrp_reparent(rdtgrp, new_prdtgrp, tmpmask);
+
+ free_cpumask_var(tmpmask);
+
+out:
+ mutex_unlock(&rdtgroup_mutex);
+ rdtgroup_kn_put(rdtgrp, kn);
+ rdtgroup_kn_put(new_prdtgrp, new_parent);
+ return ret;
+}
+
+static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
+{
+ if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
+ seq_puts(seq, ",cdp");
+
+ if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
+ seq_puts(seq, ",cdpl2");
+
+ if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
+ seq_puts(seq, ",mba_MBps");
+
+ if (resctrl_debug)
+ seq_puts(seq, ",debug");
+
+ return 0;
+}
+
+static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = {
+ .mkdir = rdtgroup_mkdir,
+ .rmdir = rdtgroup_rmdir,
+ .rename = rdtgroup_rename,
+ .show_options = rdtgroup_show_options,
+};
+
+static int rdtgroup_setup_root(struct rdt_fs_context *ctx)
+{
+ rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops,
+ KERNFS_ROOT_CREATE_DEACTIVATED |
+ KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK,
+ &rdtgroup_default);
+ if (IS_ERR(rdt_root))
+ return PTR_ERR(rdt_root);
+
+ ctx->kfc.root = rdt_root;
+ rdtgroup_default.kn = kernfs_root_to_node(rdt_root);
+
+ return 0;
+}
+
+static void rdtgroup_destroy_root(void)
+{
+ kernfs_destroy_root(rdt_root);
+ rdtgroup_default.kn = NULL;
+}
+
+static void rdtgroup_setup_default(void)
+{
+ mutex_lock(&rdtgroup_mutex);
+
+ rdtgroup_default.closid = RESCTRL_RESERVED_CLOSID;
+ rdtgroup_default.mon.rmid = RESCTRL_RESERVED_RMID;
+ rdtgroup_default.type = RDTCTRL_GROUP;
+ INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list);
+
+ list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
+
+ mutex_unlock(&rdtgroup_mutex);
+}
+
+static void domain_destroy_mon_state(struct rdt_domain *d)
+{
+ bitmap_free(d->rmid_busy_llc);
+ kfree(d->mbm_total);
+ kfree(d->mbm_local);
+}
+
+void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
+{
+ mutex_lock(&rdtgroup_mutex);
+
+ if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
+ mba_sc_domain_destroy(r, d);
+
+ if (!r->mon_capable)
+ goto out_unlock;
+
+ /*
+ * If resctrl is mounted, remove all the
+ * per domain monitor data directories.
+ */
+ if (resctrl_mounted && resctrl_arch_mon_capable())
+ rmdir_mondata_subdir_allrdtgrp(r, d->id);
+
+ if (resctrl_is_mbm_enabled())
+ cancel_delayed_work(&d->mbm_over);
+ if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
+ /*
+ * When a package is going down, forcefully
+ * decrement rmid->ebusy. There is no way to know
+ * that the L3 was flushed and hence may lead to
+ * incorrect counts in rare scenarios, but leaving
+ * the RMID as busy creates RMID leaks if the
+ * package never comes back.
+ */
+ __check_limbo(d, true);
+ cancel_delayed_work(&d->cqm_limbo);
+ }
+
+ domain_destroy_mon_state(d);
+
+out_unlock:
+ mutex_unlock(&rdtgroup_mutex);
+}
+
+static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
+{
+ u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+ size_t tsize;
+
+ if (resctrl_arch_is_llc_occupancy_enabled()) {
+ d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
+ if (!d->rmid_busy_llc)
+ return -ENOMEM;
+ }
+ if (resctrl_arch_is_mbm_total_enabled()) {
+ tsize = sizeof(*d->mbm_total);
+ d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
+ if (!d->mbm_total) {
+ bitmap_free(d->rmid_busy_llc);
+ return -ENOMEM;
+ }
+ }
+ if (resctrl_arch_is_mbm_local_enabled()) {
+ tsize = sizeof(*d->mbm_local);
+ d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
+ if (!d->mbm_local) {
+ bitmap_free(d->rmid_busy_llc);
+ kfree(d->mbm_total);
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
+{
+ int err = 0;
+
+ mutex_lock(&rdtgroup_mutex);
+
+ if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) {
+ /* RDT_RESOURCE_MBA is never mon_capable */
+ err = mba_sc_domain_allocate(r, d);
+ goto out_unlock;
+ }
+
+ if (!r->mon_capable)
+ goto out_unlock;
+
+ err = domain_setup_mon_state(r, d);
+ if (err)
+ goto out_unlock;
+
+ if (resctrl_is_mbm_enabled()) {
+ INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
+ mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
+ RESCTRL_PICK_ANY_CPU);
+ }
+
+ if (resctrl_arch_is_llc_occupancy_enabled())
+ INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
+
+ /*
+ * If the filesystem is not mounted then only the default resource group
+ * exists. Creation of its directories is deferred until mount time
+ * by rdt_get_tree() calling mkdir_mondata_all().
+ * If resctrl is mounted, add per domain monitor data directories.
+ */
+ if (resctrl_mounted && resctrl_arch_mon_capable())
+ mkdir_mondata_subdir_allrdtgrp(r, d);
+
+out_unlock:
+ mutex_unlock(&rdtgroup_mutex);
+
+ return err;
+}
+
+void resctrl_online_cpu(unsigned int cpu)
+{
+ mutex_lock(&rdtgroup_mutex);
+ /* The CPU is set in default rdtgroup after online. */
+ cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
+ mutex_unlock(&rdtgroup_mutex);
+}
+
+static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
+{
+ struct rdtgroup *cr;
+
+ list_for_each_entry(cr, &r->mon.crdtgrp_list, mon.crdtgrp_list) {
+ if (cpumask_test_and_clear_cpu(cpu, &cr->cpu_mask))
+ break;
+ }
+}
+
+void resctrl_offline_cpu(unsigned int cpu)
+{
+ struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+ struct rdtgroup *rdtgrp;
+ struct rdt_domain *d;
+
+ mutex_lock(&rdtgroup_mutex);
+ list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+ if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask)) {
+ clear_childcpus(rdtgrp, cpu);
+ break;
+ }
+ }
+
+ if (!l3->mon_capable)
+ goto out_unlock;
+
+ d = resctrl_get_domain_from_cpu(cpu, l3);
+ if (d) {
+ if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
+ cancel_delayed_work(&d->mbm_over);
+ mbm_setup_overflow_handler(d, 0, cpu);
+ }
+ if (resctrl_arch_is_llc_occupancy_enabled() &&
+ cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
+ cancel_delayed_work(&d->cqm_limbo);
+ cqm_setup_limbo_handler(d, 0, cpu);
+ }
+ }
+
+out_unlock:
+ mutex_unlock(&rdtgroup_mutex);
+}
+
+/*
+ * resctrl_init - resctrl filesystem initialization
+ *
+ * Setup resctrl file system including set up root, create mount point,
+ * register resctrl filesystem, and initialize files under root directory.
+ *
+ * Return: 0 on success or -errno
+ */
+int resctrl_init(void)
+{
+ int ret = 0;
+
+ seq_buf_init(&last_cmd_status, last_cmd_status_buf,
+ sizeof(last_cmd_status_buf));
+
+ rdtgroup_setup_default();
+
+ thread_throttle_mode_init();
+
+ ret = resctrl_mon_resource_init();
+ if (ret)
+ return ret;
+
+ ret = sysfs_create_mount_point(fs_kobj, "resctrl");
+ if (ret)
+ return ret;
+
+ ret = register_filesystem(&rdt_fs_type);
+ if (ret)
+ goto cleanup_mountpoint;
+
+ /*
+ * Adding the resctrl debugfs directory here may not be ideal since
+ * it would let the resctrl debugfs directory appear on the debugfs
+ * filesystem before the resctrl filesystem is mounted.
+ * It may also be ok since that would enable debugging of RDT before
+ * resctrl is mounted.
+ * The reason why the debugfs directory is created here and not in
+ * rdt_get_tree() is because rdt_get_tree() takes rdtgroup_mutex and
+ * during the debugfs directory creation also &sb->s_type->i_mutex_key
+ * (the lockdep class of inode->i_rwsem). Other filesystem
+ * interactions (eg. SyS_getdents) have the lock ordering:
+ * &sb->s_type->i_mutex_key --> &mm->mmap_lock
+ * During mmap(), called with &mm->mmap_lock, the rdtgroup_mutex
+ * is taken, thus creating dependency:
+ * &mm->mmap_lock --> rdtgroup_mutex for the latter that can cause
+ * issues considering the other two lock dependencies.
+ * By creating the debugfs directory here we avoid a dependency
+ * that may cause deadlock (even though file operations cannot
+ * occur until the filesystem is mounted, but I do not know how to
+ * tell lockdep that).
+ */
+ debugfs_resctrl = debugfs_create_dir("resctrl", NULL);
+
+ return 0;
+
+cleanup_mountpoint:
+ sysfs_remove_mount_point(fs_kobj, "resctrl");
+
+ return ret;
+}
+
+void resctrl_exit(void)
+{
+ debugfs_remove_recursive(debugfs_resctrl);
+ unregister_filesystem(&rdt_fs_type);
+ sysfs_remove_mount_point(fs_kobj, "resctrl");
+
+ resctrl_mon_resource_exit();
+}
--
2.34.1
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