| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <175793564532.709179.12752119155462957544.tip-bot2@tip-bot2>
Date: Mon, 15 Sep 2025 11:27:25 -0000
From: "tip-bot2 for Babu Moger" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Babu Moger <babu.moger@....com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/cache] fs/resctrl: Introduce mbm_L3_assignments to list
assignments in a group
The following commit has been merged into the x86/cache branch of tip:
Commit-ID: cba8222880b88d96f3ed6c8a115e335e552b83a1
Gitweb: https://git.kernel.org/tip/cba8222880b88d96f3ed6c8a115e335e552b83a1
Author: Babu Moger <babu.moger@....com>
AuthorDate: Fri, 05 Sep 2025 16:34:27 -05:00
Committer: Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 15 Sep 2025 12:45:34 +02:00
fs/resctrl: Introduce mbm_L3_assignments to list assignments in a group
Introduce the mbm_L3_assignments resctrl file associated with CTRL_MON and MON
resource groups to display the counter assignment states of the resource group
when "mbm_event" counter assignment mode is enabled.
Display the list in the following format:
<Event>:<Domain id>=<Assignment state>;<Domain id>=<Assignment state>
Event: A valid MBM event listed in
/sys/fs/resctrl/info/L3_MON/event_configs directory.
Domain ID: A valid domain ID.
The assignment state can be one of the following:
_ : No counter assigned.
e : Counter assigned exclusively.
Example:
To list the assignment states for the default group
$ cd /sys/fs/resctrl
$ cat /sys/fs/resctrl/mbm_L3_assignments
mbm_total_bytes:0=e;1=e
mbm_local_bytes:0=e;1=e
Signed-off-by: Babu Moger <babu.moger@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
---
Documentation/filesystems/resctrl.rst | 31 ++++++++++++++++-
fs/resctrl/internal.h | 2 +-
fs/resctrl/monitor.c | 49 ++++++++++++++++++++++++++-
fs/resctrl/rdtgroup.c | 6 +++-
4 files changed, 88 insertions(+)
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
index 1de815b..a2b7240 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -509,6 +509,37 @@ When monitoring is enabled all MON groups will also contain:
Available only with debug option. The identifier used by hardware
for the monitor group. On x86 this is the RMID.
+When monitoring is enabled all MON groups may also contain:
+
+"mbm_L3_assignments":
+ Exists when "mbm_event" counter assignment mode is supported and lists the
+ counter assignment states of the group.
+
+ The assignment list is displayed in the following format:
+
+ <Event>:<Domain ID>=<Assignment state>;<Domain ID>=<Assignment state>
+
+ Event: A valid MBM event in the
+ /sys/fs/resctrl/info/L3_MON/event_configs directory.
+
+ Domain ID: A valid domain ID.
+
+ Assignment states:
+
+ _ : No counter assigned.
+
+ e : Counter assigned exclusively.
+
+ Example:
+
+ To display the counter assignment states for the default group.
+ ::
+
+ # cd /sys/fs/resctrl
+ # cat /sys/fs/resctrl/mbm_L3_assignments
+ mbm_total_bytes:0=e;1=e
+ mbm_local_bytes:0=e;1=e
+
When the "mba_MBps" mount option is used all CTRL_MON groups will also contain:
"mba_MBps_event":
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 66c677c..43297b3 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -416,6 +416,8 @@ int resctrl_mbm_assign_on_mkdir_show(struct kernfs_open_file *of,
ssize_t resctrl_mbm_assign_on_mkdir_write(struct kernfs_open_file *of, char *buf,
size_t nbytes, loff_t off);
+int mbm_L3_assignments_show(struct kernfs_open_file *of, struct seq_file *s, void *v);
+
#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 9cb3341..b692a0e 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -1454,6 +1454,54 @@ out_unlock:
return ret;
}
+int mbm_L3_assignments_show(struct kernfs_open_file *of, struct seq_file *s, void *v)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+ struct rdt_mon_domain *d;
+ struct rdtgroup *rdtgrp;
+ struct mon_evt *mevt;
+ int ret = 0;
+ bool sep;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ ret = -ENOENT;
+ goto out_unlock;
+ }
+
+ rdt_last_cmd_clear();
+ if (!resctrl_arch_mbm_cntr_assign_enabled(r)) {
+ rdt_last_cmd_puts("mbm_event counter assignment mode is not enabled\n");
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ for_each_mon_event(mevt) {
+ if (mevt->rid != r->rid || !mevt->enabled || !resctrl_is_mbm_event(mevt->evtid))
+ continue;
+
+ sep = false;
+ seq_printf(s, "%s:", mevt->name);
+ list_for_each_entry(d, &r->mon_domains, hdr.list) {
+ if (sep)
+ seq_putc(s, ';');
+
+ if (mbm_cntr_get(r, d, rdtgrp, mevt->evtid) < 0)
+ seq_printf(s, "%d=_", d->hdr.id);
+ else
+ seq_printf(s, "%d=e", d->hdr.id);
+
+ sep = true;
+ }
+ seq_putc(s, '\n');
+ }
+
+out_unlock:
+ rdtgroup_kn_unlock(of->kn);
+
+ return ret;
+}
+
/**
* resctrl_mon_resource_init() - Initialise global monitoring structures.
*
@@ -1512,6 +1560,7 @@ int resctrl_mon_resource_init(void)
resctrl_file_fflags_init("event_filter", RFTYPE_ASSIGN_CONFIG);
resctrl_file_fflags_init("mbm_assign_on_mkdir", RFTYPE_MON_INFO |
RFTYPE_RES_CACHE);
+ resctrl_file_fflags_init("mbm_L3_assignments", RFTYPE_MON_BASE);
}
return 0;
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 48f9814..519aa6a 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1938,6 +1938,12 @@ static struct rftype res_common_files[] = {
.write = event_filter_write,
},
{
+ .name = "mbm_L3_assignments",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = mbm_L3_assignments_show,
+ },
+ {
.name = "mbm_assign_mode",
.mode = 0444,
.kf_ops = &rdtgroup_kf_single_ops,
Powered by blists - more mailing lists