[tip: x86/cache] fs/resctrl: Pass struct rdtgroup instead of individual members

["tip-bot2 for Babu Moger" <tip-bot2@linutronix.de>]

The following commit has been merged into the x86/cache branch of tip:

Commit-ID:     bc53eea6c2a1dea152a0073a2f2814b697ad197e
Gitweb:        https://git.kernel.org/tip/bc53eea6c2a1dea152a0073a2f2814b697ad197e
Author:        Babu Moger <babu.moger@amd.com>
AuthorDate:    Fri, 05 Sep 2025 16:34:18 -05:00
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Mon, 15 Sep 2025 12:23:24 +02:00

fs/resctrl: Pass struct rdtgroup instead of individual members

Reading monitoring data for a monitoring group requires both the RMID and
CLOSID. The RMID and CLOSID are members of struct rdtgroup but passed
separately to several functions involved in retrieving event data.

When "mbm_event" counter assignment mode is enabled, a counter ID is required
to read event data. The counter ID is obtained through mbm_cntr_get(), which
expects a struct rdtgroup pointer.

Provide a pointer to the struct rdtgroup as parameter to functions involved in
retrieving event data to simplify access to RMID, CLOSID, and counter ID.

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
---
 fs/resctrl/monitor.c | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 2ed29ae..c815153 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -413,9 +413,11 @@ static void mbm_cntr_free(struct rdt_mon_domain *d, int cntr_id)
 	memset(&d->cntr_cfg[cntr_id], 0, sizeof(*d->cntr_cfg));
 }
 
-static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
+static int __mon_event_count(struct rdtgroup *rdtgrp, struct rmid_read *rr)
 {
 	int cpu = smp_processor_id();
+	u32 closid = rdtgrp->closid;
+	u32 rmid = rdtgrp->mon.rmid;
 	struct rdt_mon_domain *d;
 	struct mbm_state *m;
 	int err, ret;
@@ -475,8 +477,8 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 /*
  * mbm_bw_count() - Update bw count from values previously read by
  *		    __mon_event_count().
- * @closid:	The closid used to identify the cached mbm_state.
- * @rmid:	The rmid used to identify the cached mbm_state.
+ * @rdtgrp:	resctrl group associated with the CLOSID and RMID to identify
+ *		the cached mbm_state.
  * @rr:		The struct rmid_read populated by __mon_event_count().
  *
  * Supporting function to calculate the memory bandwidth
@@ -484,9 +486,11 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
  * __mon_event_count() is compared with the chunks value from the previous
  * invocation. This must be called once per second to maintain values in MBps.
  */
-static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
+static void mbm_bw_count(struct rdtgroup *rdtgrp, struct rmid_read *rr)
 {
 	u64 cur_bw, bytes, cur_bytes;
+	u32 closid = rdtgrp->closid;
+	u32 rmid = rdtgrp->mon.rmid;
 	struct mbm_state *m;
 
 	m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
@@ -515,7 +519,7 @@ void mon_event_count(void *info)
 
 	rdtgrp = rr->rgrp;
 
-	ret = __mon_event_count(rdtgrp->closid, rdtgrp->mon.rmid, rr);
+	ret = __mon_event_count(rdtgrp, rr);
 
 	/*
 	 * For Ctrl groups read data from child monitor groups and
@@ -526,8 +530,7 @@ void mon_event_count(void *info)
 
 	if (rdtgrp->type == RDTCTRL_GROUP) {
 		list_for_each_entry(entry, head, mon.crdtgrp_list) {
-			if (__mon_event_count(entry->closid, entry->mon.rmid,
-					      rr) == 0)
+			if (__mon_event_count(entry, rr) == 0)
 				ret = 0;
 		}
 	}
@@ -658,7 +661,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
 }
 
 static void mbm_update_one_event(struct rdt_resource *r, struct rdt_mon_domain *d,
-				 u32 closid, u32 rmid, enum resctrl_event_id evtid)
+				 struct rdtgroup *rdtgrp, enum resctrl_event_id evtid)
 {
 	struct rmid_read rr = {0};
 
@@ -672,30 +675,30 @@ static void mbm_update_one_event(struct rdt_resource *r, struct rdt_mon_domain *
 		return;
 	}
 
-	__mon_event_count(closid, rmid, &rr);
+	__mon_event_count(rdtgrp, &rr);
 
 	/*
 	 * If the software controller is enabled, compute the
 	 * bandwidth for this event id.
 	 */
 	if (is_mba_sc(NULL))
-		mbm_bw_count(closid, rmid, &rr);
+		mbm_bw_count(rdtgrp, &rr);
 
 	resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
 }
 
 static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
-		       u32 closid, u32 rmid)
+		       struct rdtgroup *rdtgrp)
 {
 	/*
 	 * This is protected from concurrent reads from user as both
 	 * the user and overflow handler hold the global mutex.
 	 */
 	if (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID))
-		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_TOTAL_EVENT_ID);
+		mbm_update_one_event(r, d, rdtgrp, QOS_L3_MBM_TOTAL_EVENT_ID);
 
 	if (resctrl_is_mon_event_enabled(QOS_L3_MBM_LOCAL_EVENT_ID))
-		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_LOCAL_EVENT_ID);
+		mbm_update_one_event(r, d, rdtgrp, QOS_L3_MBM_LOCAL_EVENT_ID);
 }
 
 /*
@@ -768,11 +771,11 @@ void mbm_handle_overflow(struct work_struct *work)
 	d = container_of(work, struct rdt_mon_domain, mbm_over.work);
 
 	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
+		mbm_update(r, d, prgrp);
 
 		head = &prgrp->mon.crdtgrp_list;
 		list_for_each_entry(crgrp, head, mon.crdtgrp_list)
-			mbm_update(r, d, crgrp->closid, crgrp->mon.rmid);
+			mbm_update(r, d, crgrp);
 
 		if (is_mba_sc(NULL))
 			update_mba_bw(prgrp, d);