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Message-ID: <15ecac1be290452ff119f67f640c26b8203a4c01.1753467772.git.babu.moger@amd.com>
Date: Fri, 25 Jul 2025 13:29:45 -0500
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <tony.luck@...el.com>, <reinette.chatre@...el.com>,
<james.morse@....com>, <tglx@...utronix.de>, <mingo@...hat.com>,
<bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <Dave.Martin@....com>, <x86@...nel.org>, <hpa@...or.com>,
<akpm@...ux-foundation.org>, <paulmck@...nel.org>, <rostedt@...dmis.org>,
<Neeraj.Upadhyay@....com>, <david@...hat.com>, <arnd@...db.de>,
<fvdl@...gle.com>, <seanjc@...gle.com>, <jpoimboe@...nel.org>,
<pawan.kumar.gupta@...ux.intel.com>, <xin@...or.com>,
<manali.shukla@....com>, <babu.moger@....com>, <tao1.su@...ux.intel.com>,
<sohil.mehta@...el.com>, <kai.huang@...el.com>, <xiaoyao.li@...el.com>,
<peterz@...radead.org>, <xin3.li@...el.com>, <kan.liang@...ux.intel.com>,
<mario.limonciello@....com>, <thomas.lendacky@....com>, <perry.yuan@....com>,
<gautham.shenoy@....com>, <chang.seok.bae@...el.com>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<peternewman@...gle.com>, <eranian@...gle.com>
Subject: [PATCH v16 26/34] fs/resctrl: Provide interface to update the event configurations
When "mbm_event" counter assignment mode is supported, users can modify
the event configuration by writing to the 'event_filter' resctrl file.
The event configurations for mbm_event mode are located in
/sys/fs/resctrl/info/L3_MON/event_configs/.
Update the assignments of all CTRL_MON and MON resource groups when the
event configuration is modified.
Example:
$ mount -t resctrl resctrl /sys/fs/resctrl
$ cd /sys/fs/resctrl/
$ cat info/L3_MON/event_configs/mbm_local_bytes/event_filter
local_reads,local_non_temporal_writes,local_reads_slow_memory
$ echo "local_reads,local_non_temporal_writes" >
info/L3_MON/event_configs/mbm_total_bytes/event_filter
$ cat info/L3_MON/event_configs/mbm_total_bytes/event_filter
local_reads,local_non_temporal_writes
Signed-off-by: Babu Moger <babu.moger@....com>
---
v16: Moved resctrl_process_configs() and event_filter_write()
to fs/resctrl/monitor.c.
Renamed resctrl_process_configs() -> resctrl_parse_mem_transactions().
Few minor code commnet update.
v15: Updated changelog.
Updated spacing in resctrl.rst.
Corrected the name counter_configs -> event_configs.
Changed the name rdtgroup_assign_cntr() > rdtgroup_update_cntr_event().
Removed the code to check d->cntr_cfg[cntr_id].evt_cfg.
Fixed the partial initialization of val in resctrl_process_configs().
Passed mon_evt where applicable. The struct rdt_resource can be obtained from mon_evt::rid.
v14: Passed struct mon_evt where applicable instead of just the event type.
Fixed few text corrections about memory trasaction type.
Renamed few functions resctrl_group_assign() -> rdtgroup_assign_cntr()
resctrl_update_assign() -> resctrl_assign_cntr_allrdtgrp()
Removed few extra bases.
v13: Updated changelog for imperative mode.
Added function description in the prototype.
Updated the user doc resctrl.rst to address few feedback.
Resolved conflicts caused by the recent FS/ARCH code restructure.
The rdtgroup.c/monitor.c file has now been split between the FS and ARCH directories.
v12: New patch to modify event configurations.
---
Documentation/filesystems/resctrl.rst | 12 +++
fs/resctrl/internal.h | 4 +
fs/resctrl/monitor.c | 114 ++++++++++++++++++++++++++
fs/resctrl/rdtgroup.c | 3 +-
4 files changed, 132 insertions(+), 1 deletion(-)
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
index 3dfc177f9792..37dbad4d50f7 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -342,6 +342,18 @@ with the following files:
# cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_local_bytes/event_filter
local_reads,local_non_temporal_writes,local_reads_slow_memory
+ Modify the event configuration by writing to the "event_filter" file within
+ the "event_configs" directory. The read/write "event_filter" file contains the
+ configuration of the event that reflects which memory transactions are counted by it.
+
+ For example::
+
+ # echo "local_reads, local_non_temporal_writes" >
+ /sys/fs/resctrl/info/L3_MON/event_configs/mbm_total_bytes/event_filter
+
+ # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_total_bytes/event_filter
+ local_reads,local_non_temporal_writes
+
"max_threshold_occupancy":
Read/write file provides the largest value (in
bytes) at which a previously used LLC_occupancy
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index e082d8718199..e2e3fc0c5fab 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -409,11 +409,15 @@ void rdtgroup_unassign_cntr_event(struct rdt_mon_domain *d, struct rdtgroup *rdt
struct mon_evt *mevt);
int mbm_cntr_get(struct rdt_resource *r, struct rdt_mon_domain *d,
struct rdtgroup *rdtgrp, enum resctrl_event_id evtid);
+void resctrl_update_cntr_allrdtgrp(struct mon_evt *mevt);
void *rdt_kn_parent_priv(struct kernfs_node *kn);
int event_filter_show(struct kernfs_open_file *of, struct seq_file *seq, void *v);
+ssize_t event_filter_write(struct kernfs_open_file *of, char *buf, size_t nbytes,
+ loff_t off);
+
#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 fa5f63126682..8efbeb910f77 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -952,6 +952,77 @@ int event_filter_show(struct kernfs_open_file *of, struct seq_file *seq, void *v
return 0;
}
+static int resctrl_parse_mem_transactions(char *tok, u32 *val)
+{
+ u32 temp_val = 0;
+ char *evt_str;
+ bool found;
+ int i;
+
+next_config:
+ if (!tok || tok[0] == '\0') {
+ *val = temp_val;
+ return 0;
+ }
+
+ /* Start processing the strings for each memory transaction type */
+ evt_str = strim(strsep(&tok, ","));
+ found = false;
+ for (i = 0; i < NUM_MBM_TRANSACTIONS; i++) {
+ if (!strcmp(mbm_transactions[i].name, evt_str)) {
+ temp_val |= mbm_transactions[i].val;
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ rdt_last_cmd_printf("Invalid memory transaction type %s\n", evt_str);
+ return -EINVAL;
+ }
+
+ goto next_config;
+}
+
+ssize_t event_filter_write(struct kernfs_open_file *of, char *buf, size_t nbytes,
+ loff_t off)
+{
+ struct mon_evt *mevt = rdt_kn_parent_priv(of->kn);
+ struct rdt_resource *r;
+ u32 evt_cfg = 0;
+ int ret = 0;
+
+ /* Valid input requires a trailing newline */
+ if (nbytes == 0 || buf[nbytes - 1] != '\n')
+ return -EINVAL;
+
+ buf[nbytes - 1] = '\0';
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ rdt_last_cmd_clear();
+
+ r = resctrl_arch_get_resource(mevt->rid);
+ 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;
+ }
+
+ ret = resctrl_parse_mem_transactions(buf, &evt_cfg);
+ if (!ret && mevt->evt_cfg != evt_cfg) {
+ mevt->evt_cfg = evt_cfg;
+ resctrl_update_cntr_allrdtgrp(mevt);
+ }
+
+out_unlock:
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+
+ return ret ?: nbytes;
+}
+
/**
* resctrl_mon_resource_init() - Initialise global monitoring structures.
*
@@ -1193,3 +1264,46 @@ void rdtgroup_unassign_cntr_event(struct rdt_mon_domain *d, struct rdtgroup *rdt
rdtgroup_free_unassign_cntr(r, d, rdtgrp, mevt);
}
}
+
+/*
+ * rdtgroup_update_cntr_event - Update the counter assignments for the event
+ * in a group.
+ * @r: Resource to which update needs to be done.
+ * @rdtgrp: Resctrl group.
+ * @evtid: MBM monitor event.
+ */
+static void rdtgroup_update_cntr_event(struct rdt_resource *r, struct rdtgroup *rdtgrp,
+ enum resctrl_event_id evtid)
+{
+ struct rdt_mon_domain *d;
+ int cntr_id;
+
+ list_for_each_entry(d, &r->mon_domains, hdr.list) {
+ cntr_id = mbm_cntr_get(r, d, rdtgrp, evtid);
+ if (cntr_id >= 0)
+ resctrl_arch_config_cntr(r, d, evtid, rdtgrp->mon.rmid,
+ rdtgrp->closid, cntr_id, true);
+ }
+}
+
+/*
+ * resctrl_update_cntr_allrdtgrp - Update the counter assignments for the event
+ * for all the groups.
+ * @mevt MBM Monitor event.
+ */
+void resctrl_update_cntr_allrdtgrp(struct mon_evt *mevt)
+{
+ struct rdt_resource *r = resctrl_arch_get_resource(mevt->rid);
+ struct rdtgroup *prgrp, *crgrp;
+
+ /*
+ * Find all the groups where the event is assigned and update the
+ * configuration of existing assignments.
+ */
+ list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+ rdtgroup_update_cntr_event(r, prgrp, mevt->evtid);
+
+ list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
+ rdtgroup_update_cntr_event(r, crgrp, mevt->evtid);
+ }
+}
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 11fc8e362ead..c3d6540c3280 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2021,9 +2021,10 @@ static struct rftype res_common_files[] = {
},
{
.name = "event_filter",
- .mode = 0444,
+ .mode = 0644,
.kf_ops = &rdtgroup_kf_single_ops,
.seq_show = event_filter_show,
+ .write = event_filter_write,
},
{
.name = "mbm_assign_mode",
--
2.34.1
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