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Message-ID: <175793564884.709179.6220500280545864729.tip-bot2@tip-bot2>
Date: Mon, 15 Sep 2025 11:27:28 -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: Provide interface to update the event
configurations
The following commit has been merged into the x86/cache branch of tip:
Commit-ID: f9ae5913d47cda67481a4f54cc3273d3d1d00a01
Gitweb: https://git.kernel.org/tip/f9ae5913d47cda67481a4f54cc3273d3d1d00a01
Author: Babu Moger <babu.moger@....com>
AuthorDate: Fri, 05 Sep 2025 16:34:24 -05:00
Committer: Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 15 Sep 2025 12:40:38 +02:00
fs/resctrl: Provide interface to update the event configurations
When "mbm_event" counter assignment mode is enabled, 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>
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 | 12 +++-
fs/resctrl/internal.h | 3 +-
fs/resctrl/monitor.c | 114 +++++++++++++++++++++++++-
fs/resctrl/rdtgroup.c | 3 +-
4 files changed, 131 insertions(+), 1 deletion(-)
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
index ddd95f1..2e840ef 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -343,6 +343,18 @@ 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 9bf2e2f..90d3e4a 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -407,6 +407,9 @@ void rdtgroup_unassign_cntrs(struct rdtgroup *rdtgrp);
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 7179f98..ccb9726 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -1192,6 +1192,120 @@ void rdtgroup_unassign_cntrs(struct rdtgroup *rdtgrp)
&mon_event_all[QOS_L3_MBM_LOCAL_EVENT_ID]);
}
+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;
+}
+
+/*
+ * 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)
+ rdtgroup_assign_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.
+ */
+static 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);
+ }
+}
+
+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;
+}
+
int resctrl_mbm_assign_mode_show(struct kernfs_open_file *of,
struct seq_file *s, void *v)
{
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 8f0c403..e90bc80 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1925,9 +1925,10 @@ 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",
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