Provide the interface to display the number of counters IDs available for
assignment in each domain when "mbm_event" mode is enabled.
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v14: Minor changelog update.
Changed subject line to fs/resctrl.
v13: Resolved conflicts caused by the recent FS/ARCH code restructure.
The files monitor.c and rdtgroup.c file has now been split between
the FS and ARCH directories.
v12: Minor change to change log.
Updated the documentation text with an example.
Replaced seq_puts(s, ";") with seq_putc(s, ';');
Added missing rdt_last_cmd_clear() in resctrl_available_mbm_cntrs_show().
v11: Rename rdtgroup_available_mbm_cntrs_show() to resctrl_available_mbm_cntrs_show().
Few minor text changes.
v10: Patch changed to handle the counters at domain level.
https://lore.kernel.org/lkml/CALPaoCj+zWq1vkHVbXYP0znJbe6Ke3PXPWjtri5AFgD9cQDCUg@xxxxxxxxxxxxxx/
So, display logic also changed now.
v9: New patch
---
Documentation/filesystems/resctrl.rst | 11 ++++++
fs/resctrl/monitor.c | 5 ++-
fs/resctrl/rdtgroup.c | 48 +++++++++++++++++++++++++++
3 files changed, 63 insertions(+), 1 deletion(-)
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
index 801914de0c81..8a2050098091 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -299,6 +299,17 @@ with the following files:
# cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs
0=32;1=32
+"available_mbm_cntrs":
+ The number of assignable counters available in each domain when
+ mbm_event mode is enabled on the system.
+
+ For example, on a system with 30 available [hardware] assignable counters
+ in each of its L3 domains:
+ ::
+
+ # cat /sys/fs/resctrl/info/L3_MON/available_mbm_cntrs
+ 0=30;1=30
+
"max_threshold_occupancy":
Read/write file provides the largest value (in
bytes) at which a previously used LLC_occupancy
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 92a87aa97b0f..2893da994f3c 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -924,9 +924,12 @@ int resctrl_mon_resource_init(void)
else if (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID))
mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
- if (r->mon.mbm_cntr_assignable)
+ if (r->mon.mbm_cntr_assignable) {
resctrl_file_fflags_init("num_mbm_cntrs",
RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+ resctrl_file_fflags_init("available_mbm_cntrs",
+ RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+ }
return 0;
}
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 90b52593ef29..08bcca9bd8b6 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1853,6 +1853,48 @@ static int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of,
return 0;
}
+static int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
+ struct rdt_mon_domain *dom;
+ bool sep = false;
+ u32 cntrs, i;
+ int ret = 0;
+
+ cpus_read_lock();
+ mutex_lock(&rdtgroup_mutex);
+
+ rdt_last_cmd_clear();
+
+ if (!resctrl_arch_mbm_cntr_assign_enabled(r)) {
+ rdt_last_cmd_puts("mbm_cntr_assign mode is not enabled\n");
+ ret = -EINVAL;
+ goto unlock_cntrs_show;
+ }
+
+ list_for_each_entry(dom, &r->mon_domains, hdr.list) {
+ if (sep)
+ seq_putc(s, ';');
+
+ cntrs = 0;
+ for (i = 0; i < r->mon.num_mbm_cntrs; i++) {
+ if (!dom->cntr_cfg[i].rdtgrp)
+ cntrs++;
+ }
+
+ seq_printf(s, "%d=%u", dom->hdr.id, cntrs);
+ sep = true;
+ }
+ seq_putc(s, '\n');
+
+unlock_cntrs_show:
+ mutex_unlock(&rdtgroup_mutex);
+ cpus_read_unlock();
+
+ return ret;
+}
+
/* rdtgroup information files for one cache resource. */
static struct rftype res_common_files[] = {
{
@@ -1876,6 +1918,12 @@ static struct rftype res_common_files[] = {
.seq_show = rdt_mon_features_show,
.fflags = RFTYPE_MON_INFO,
},
+ {
+ .name = "available_mbm_cntrs",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = resctrl_available_mbm_cntrs_show,
+ },
{
.name = "num_rmids",
.mode = 0444,
--
2.34.1
