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Message-ID: <df215f02db88cad714755cd5275f20cf0ee4ae26.1752013061.git.babu.moger@amd.com>
Date: Tue, 8 Jul 2025 17:17:32 -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 v15 23/34] fs/resctrl: Support counter read/reset with mbm_event assignment mode
When "mbm_event" counter assignment mode is enabled, the architecture
requires a counter ID to read the event data.
Introduce an is_cntr field in struct rmid_read to indicate whether counter
assignment mode is in use.
Update the logic to call resctrl_arch_cntr_read() and
resctrl_arch_reset_cntr() when the assignment mode is active.
Declare mbm_cntr_get() in fs/resctrl/internal.h to make it accessible to
other functions within fs/resctrl.
Suggested-by: Reinette Chatre <reinette.chatre@...el.com>
Signed-off-by: Babu Moger <babu.moger@....com>
---
v15: New patch to add is_cntr in rmid_read as discussed in
https://lore.kernel.org/lkml/b4b14670-9cb0-4f65-abd5-39db996e8da9@intel.com/
---
fs/resctrl/ctrlmondata.c | 8 ++++++++
fs/resctrl/internal.h | 5 +++++
fs/resctrl/monitor.c | 42 +++++++++++++++++++++++++++++++++-------
3 files changed, 48 insertions(+), 7 deletions(-)
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index ad7ffc6acf13..ce766b2cdfc1 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -569,6 +569,14 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
return;
}
+ if (resctrl_arch_mbm_cntr_assign_enabled(r) && resctrl_is_mbm_event(evtid)) {
+ if (mbm_cntr_get(r, d, rdtgrp, evtid) < 0) {
+ rr->err = -ENOENT;
+ return;
+ }
+ rr->is_cntr = true;
+ }
+
cpu = cpumask_any_housekeeping(cpumask, RESCTRL_PICK_ANY_CPU);
/*
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 647a0466ffa0..fb4fec4a4cdc 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -110,6 +110,8 @@ struct mon_data {
* domains in @r sharing L3 @ci.id
* @evtid: Which monitor event to read.
* @first: Initialize MBM counter when true.
+ * @is_cntr: Is the counter valid? true if "mbm_event" counter assignment mode is
+ * enabled and it is an MBM event.
* @ci_id: Cacheinfo id for L3. Only set when @d is NULL. Used when summing domains.
* @err: Error encountered when reading counter.
* @val: Returned value of event counter. If @rgrp is a parent resource group,
@@ -124,6 +126,7 @@ struct rmid_read {
struct rdt_mon_domain *d;
enum resctrl_event_id evtid;
bool first;
+ bool is_cntr;
unsigned int ci_id;
int err;
u64 val;
@@ -391,6 +394,8 @@ int rdtgroup_assign_cntr_event(struct rdt_mon_domain *d, struct rdtgroup *rdtgrp
struct mon_evt *mevt);
void rdtgroup_unassign_cntr_event(struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
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);
#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 73f507942b6d..35faca7ff3b1 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -366,9 +366,21 @@ static int __mon_event_count(struct rdtgroup *rdtgrp, struct rmid_read *rr)
struct mbm_state *m;
int err, ret;
u64 tval = 0;
+ int cntr_id;
+
+ if (rr->is_cntr) {
+ cntr_id = mbm_cntr_get(rr->r, rr->d, rdtgrp, rr->evtid);
+ if (cntr_id < 0) {
+ rr->err = -ENOENT;
+ return -EINVAL;
+ }
+ }
if (rr->first) {
- resctrl_arch_reset_rmid(rr->r, rr->d, closid, rmid, rr->evtid);
+ if (rr->is_cntr)
+ resctrl_arch_reset_cntr(rr->r, rr->d, closid, rmid, cntr_id, rr->evtid);
+ else
+ resctrl_arch_reset_rmid(rr->r, rr->d, closid, rmid, rr->evtid);
m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
if (m)
memset(m, 0, sizeof(struct mbm_state));
@@ -379,8 +391,12 @@ static int __mon_event_count(struct rdtgroup *rdtgrp, struct rmid_read *rr)
/* Reading a single domain, must be on a CPU in that domain. */
if (!cpumask_test_cpu(cpu, &rr->d->hdr.cpu_mask))
return -EINVAL;
- rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid,
- rr->evtid, &tval, rr->arch_mon_ctx);
+ if (rr->is_cntr)
+ rr->err = resctrl_arch_cntr_read(rr->r, rr->d, closid, rmid, cntr_id,
+ rr->evtid, &tval, rr->arch_mon_ctx);
+ else
+ rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid,
+ rr->evtid, &tval, rr->arch_mon_ctx);
if (rr->err)
return rr->err;
@@ -405,8 +421,12 @@ static int __mon_event_count(struct rdtgroup *rdtgrp, struct rmid_read *rr)
list_for_each_entry(d, &rr->r->mon_domains, hdr.list) {
if (d->ci_id != rr->ci_id)
continue;
- err = resctrl_arch_rmid_read(rr->r, d, closid, rmid,
- rr->evtid, &tval, rr->arch_mon_ctx);
+ if (rr->is_cntr)
+ err = resctrl_arch_cntr_read(rr->r, d, closid, rmid, cntr_id,
+ rr->evtid, &tval, rr->arch_mon_ctx);
+ else
+ err = resctrl_arch_rmid_read(rr->r, d, closid, rmid,
+ rr->evtid, &tval, rr->arch_mon_ctx);
if (!err) {
rr->val += tval;
ret = 0;
@@ -620,6 +640,14 @@ static void mbm_update_one_event(struct rdt_resource *r, struct rdt_mon_domain *
return;
}
+ if (resctrl_arch_mbm_cntr_assign_enabled(r) && resctrl_is_mbm_event(evtid)) {
+ if (mbm_cntr_get(r, d, rdtgrp, evtid) < 0) {
+ rr.err = -ENOENT;
+ return;
+ }
+ rr.is_cntr = true;
+ }
+
__mon_event_count(rdtgrp, &rr);
/*
@@ -982,8 +1010,8 @@ static void resctrl_config_cntr(struct rdt_resource *r, struct rdt_mon_domain *d
* Return:
* Valid counter ID on success, or -ENOENT on failure.
*/
-static int mbm_cntr_get(struct rdt_resource *r, struct rdt_mon_domain *d,
- struct rdtgroup *rdtgrp, enum resctrl_event_id evtid)
+int mbm_cntr_get(struct rdt_resource *r, struct rdt_mon_domain *d,
+ struct rdtgroup *rdtgrp, enum resctrl_event_id evtid)
{
int cntr_id;
--
2.34.1
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