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Message-ID: <784fbc61e02e9a834473c3476ee196ef6a44e338.1745275431.git.babu.moger@amd.com>
Date: Mon, 21 Apr 2025 17:43:50 -0500
From: Babu Moger <babu.moger@....com>
To: <tony.luck@...el.com>, <reinette.chatre@...el.com>, <tglx@...utronix.de>,
<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <babu.moger@....com>, <corbet@....net>, <x86@...nel.org>, <hpa@...or.com>,
<akpm@...ux-foundation.org>, <paulmck@...nel.org>, <rostedt@...dmis.org>,
<thuth@...hat.com>, <ardb@...nel.org>, <gregkh@...uxfoundation.org>,
<thomas.lendacky@....com>, <mario.limonciello@....com>, <perry.yuan@....com>,
<seanjc@...gle.com>, <kai.huang@...el.com>, <xiaoyao.li@...el.com>,
<kan.liang@...ux.intel.com>, <riel@...riel.com>, <xin3.li@...el.com>,
<xin@...or.com>, <sohil.mehta@...el.com>, <ak@...ux.intel.com>,
<ebiggers@...gle.com>, <andrew.cooper3@...rix.com>, <gautham.shenoy@....com>,
<Xiaojian.Du@....com>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <james.morse@....com>, <fenghuay@...dia.com>,
<peternewman@...gle.com>
Subject: [PATCH v4 6/8] x86/resctrl: Introduce interface to display io_alloc CBMs
The io_alloc feature in resctrl enables system software to configure
the portion of the L3 cache allocated for I/O traffic.
Add the interface to display CBMs (Capacity Bit Mask) of io_alloc
feature.
When CDP is enabled, io_alloc routes traffic using the highest CLOSID
used by a L3CODE resource. Add a check for the CDP resource type.
Signed-off-by: Babu Moger <babu.moger@....com>
---
v4: Updated the change log.
Added rdtgroup_mutex before rdt_last_cmd_puts().
Returned -ENODEV when resource type is CDP_DATA.
Kept the resource name while printing the CBM (L3:0=fff) that way
I dont have to change show_doms() just for this feature and it is
consistant across all the schemata display.
v3: Minor changes due to changes in resctrl_arch_get_io_alloc_enabled()
and resctrl_io_alloc_closid_get().
Added the check to verify CDP resource type.
Updated the commit log.
v2: Fixed to display only on L3 resources.
Added the locks while processing.
Rename the displat to io_alloc_cbm (from sdciae_cmd).
---
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 2 +-
arch/x86/kernel/cpu/resctrl/internal.h | 1 +
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 51 ++++++++++++++++++++++-
3 files changed, 52 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 0a0ac5f6112e..d1a59b56a456 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -454,7 +454,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
return hw_dom->ctrl_val[idx];
}
-static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
+void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
{
struct rdt_resource *r = schema->res;
struct rdt_ctrl_domain *dom;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 6ead222904fe..2ac78650500a 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -519,6 +519,7 @@ void resctrl_file_fflags_init(const char *config, unsigned long fflags);
void rdt_staged_configs_clear(void);
bool closid_allocated(unsigned int closid);
int resctrl_find_cleanest_closid(void);
+void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid);
#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d53a2068cde4..5633437ea85d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2042,6 +2042,46 @@ static ssize_t resctrl_io_alloc_write(struct kernfs_open_file *of, char *buf,
return ret ?: nbytes;
}
+static int resctrl_io_alloc_cbm_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+ struct rdt_resource *r = s->res;
+ u32 io_alloc_closid;
+ int ret = 0;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ rdt_last_cmd_clear();
+
+ if (!r->cache.io_alloc_capable || s->conf_type == CDP_DATA) {
+ rdt_last_cmd_puts("io_alloc feature is not supported on the resource\n");
+ ret = -ENODEV;
+ goto cbm_show_out;
+ }
+
+ if (!resctrl_arch_get_io_alloc_enabled(r)) {
+ rdt_last_cmd_puts("io_alloc feature is not enabled\n");
+ ret = -EINVAL;
+ goto cbm_show_out;
+ }
+
+ io_alloc_closid = resctrl_io_alloc_closid_get(r, s);
+ if (io_alloc_closid < 0) {
+ rdt_last_cmd_puts("Max CLOSID to support io_alloc is not available\n");
+ ret = -EINVAL;
+ goto cbm_show_out;
+ }
+
+ show_doms(seq, s, io_alloc_closid);
+
+cbm_show_out:
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+ return ret;
+}
+
/* rdtgroup information files for one cache resource. */
static struct rftype res_common_files[] = {
{
@@ -2201,6 +2241,12 @@ static struct rftype res_common_files[] = {
.seq_show = resctrl_io_alloc_show,
.write = resctrl_io_alloc_write,
},
+ {
+ .name = "io_alloc_cbm",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = resctrl_io_alloc_cbm_show,
+ },
{
.name = "mba_MBps_event",
.mode = 0644,
@@ -2313,9 +2359,12 @@ static void io_alloc_init(void)
{
struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
- if (r->cache.io_alloc_capable)
+ if (r->cache.io_alloc_capable) {
resctrl_file_fflags_init("io_alloc",
RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE);
+ resctrl_file_fflags_init("io_alloc_cbm",
+ RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE);
+ }
}
void resctrl_file_fflags_init(const char *config, unsigned long fflags)
--
2.34.1
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