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Date: Fri, 30 Oct 2020 16:11:06 +0000
From: James Morse <james.morse@....com>
To: x86@...nel.org, linux-kernel@...r.kernel.org
Cc: 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>,
shameerali.kolothum.thodi@...wei.com,
Jamie Iles <jamie@...iainc.com>,
D Scott Phillips OS <scott@...amperecomputing.com>,
James Morse <james.morse@....com>
Subject: [PATCH 10/24] x86/resctrl: Move the schema names into struct resctrl_schema
Move the names used for the schemata file out of the resource and
into struct resctrl_schema. This allows one resource to have two
different names, based on the other schema properties.
This patch copies the names, eventually resctrl will generate them.
Remove the arch code's max_name_width, this is now resctrl's
problem.
Signed-off-by: James Morse <james.morse@....com>
---
arch/x86/kernel/cpu/resctrl/core.c | 9 ++-------
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 10 +++-------
arch/x86/kernel/cpu/resctrl/internal.h | 2 +-
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 17 ++++++++++++-----
include/linux/resctrl.h | 7 +++++++
5 files changed, 25 insertions(+), 20 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 1ed5e04031e6..cda071009fed 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -37,10 +37,10 @@ DEFINE_MUTEX(rdtgroup_mutex);
DEFINE_PER_CPU(struct resctrl_pqr_state, pqr_state);
/*
- * Used to store the max resource name width and max resource data width
+ * Used to store the max resource data width
* to display the schemata in a tabular format
*/
-int max_name_width, max_data_width;
+int max_data_width;
/*
* Global boolean for rdt_alloc which is true if any
@@ -776,13 +776,8 @@ static int resctrl_offline_cpu(unsigned int cpu)
static __init void rdt_init_padding(void)
{
struct rdt_resource *r;
- int cl;
for_each_alloc_capable_rdt_resource(r) {
- cl = strlen(r->name);
- if (cl > max_name_width)
- max_name_width = cl;
-
if (r->data_width > max_data_width)
max_data_width = r->data_width;
}
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index a65ff53394ed..28d69c78c29e 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -291,13 +291,11 @@ static int rdtgroup_parse_resource(char *resname, char *tok,
struct rdtgroup *rdtgrp)
{
struct resctrl_schema *s;
- struct rdt_resource *r;
lockdep_assert_held(&rdtgroup_mutex);
list_for_each_entry(s, &resctrl_all_schema, list) {
- r = s->res;
- if (!strcmp(resname, r->name) && rdtgrp->closid < s->num_closid)
+ 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);
@@ -391,7 +389,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
bool sep = false;
u32 ctrl_val;
- seq_printf(s, "%*s:", max_name_width, r->name);
+ seq_printf(s, "%*s:", RESCTRL_NAME_LEN, schema->name);
list_for_each_entry(dom, &r->domains, list) {
hw_dom = resctrl_to_arch_dom(dom);
if (sep)
@@ -411,7 +409,6 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
{
struct resctrl_schema *schema;
struct rdtgroup *rdtgrp;
- struct rdt_resource *r;
int ret = 0;
u32 closid;
@@ -419,8 +416,7 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
if (rdtgrp) {
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
list_for_each_entry(schema, &resctrl_all_schema, list) {
- r = schema->res;
- seq_printf(s, "%s:uninitialized\n", r->name);
+ seq_printf(s, "%s:uninitialized\n", schema->name);
}
} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
if (!rdtgrp->plr->d) {
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 27671a654f8b..5294ae0c3ed9 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -248,7 +248,7 @@ struct rdtgroup {
/* List of all resource groups */
extern struct list_head rdt_all_groups;
-extern int max_name_width, max_data_width;
+extern int max_data_width;
int __init rdtgroup_init(void);
void __exit rdtgroup_exit(void);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 311a3890bc53..48f4d6783647 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1440,8 +1440,8 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
rdt_last_cmd_puts("Cache domain offline\n");
ret = -ENODEV;
} else {
- seq_printf(s, "%*s:", max_name_width,
- rdtgrp->plr->s->res->name);
+ seq_printf(s, "%*s:", RESCTRL_NAME_LEN,
+ rdtgrp->plr->s->name);
size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
rdtgrp->plr->d,
rdtgrp->plr->cbm);
@@ -1454,7 +1454,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
r = schema->res;
sep = false;
- seq_printf(s, "%*s:", max_name_width, r->name);
+ seq_printf(s, "%*s:", RESCTRL_NAME_LEN, schema->name);
list_for_each_entry(d, &r->domains, list) {
hw_dom = resctrl_to_arch_dom(d);
if (sep)
@@ -1827,7 +1827,7 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
list_for_each_entry(s, &resctrl_all_schema, list) {
r = s->res;
fflags = r->fflags | RF_CTRL_INFO;
- ret = rdtgroup_mkdir_info_resdir(s, r->name, fflags);
+ ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
if (ret)
goto out_destroy;
}
@@ -2140,6 +2140,7 @@ static int create_schemata_list(void)
{
struct resctrl_schema *s;
struct rdt_resource *r;
+ int ret;
for_each_alloc_enabled_rdt_resource(r) {
s = kzalloc(sizeof(*s), GFP_KERNEL);
@@ -2150,6 +2151,12 @@ static int create_schemata_list(void)
s->num_closid = resctrl_arch_get_num_closid(r);
s->conf_type = resctrl_to_arch_res(r)->conf_type;
+ ret = snprintf(s->name, sizeof(s->name), r->name);
+ if (ret >= sizeof(s->name)) {
+ kfree(s);
+ return -EINVAL;
+ }
+
INIT_LIST_HEAD(&s->list);
list_add(&s->list, &resctrl_all_schema);
}
@@ -2794,7 +2801,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
*/
tmp_cbm = d->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", r->name, d->id);
+ rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
return -ENOSPC;
}
d->have_new_ctrl = true;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 8a12f4128209..9f71f0238239 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -15,6 +15,11 @@ int proc_resctrl_show(struct seq_file *m,
#endif
+/*
+ * The longest name we expect in the schemata file:
+ */
+#define RESCTRL_NAME_LEN 7
+
enum resctrl_conf_type {
CDP_BOTH,
CDP_CODE,
@@ -172,12 +177,14 @@ struct rdt_resource {
/**
* @list: Member of resctrl's schema list
+ * @names: Name to use in "schemata" file
* @conf_type: Type of configuration, e.g. code/data/both
* @res: The rdt_resource for this entry
* @num_closid Number of CLOSIDs available for this resource
*/
struct resctrl_schema {
struct list_head list;
+ char name[RESCTRL_NAME_LEN];
enum resctrl_conf_type conf_type;
struct rdt_resource *res;
u32 num_closid;
--
2.28.0
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