linux-kernel - [PATCH 08/10] x86/resctrl: Mark L3 monitor files with summation flag.

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Date: Wed, 27 Mar 2024 13:03:50 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghua.yu@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>,
	Babu Moger <babu.moger@....com>,
	Drew Fustini <dfustini@...libre.com>
Cc: x86@...nel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH 08/10] x86/resctrl: Mark L3 monitor files with summation flag.

When Sub-NUMA cluster mode is enabled, the parent monitor
files in the mon_L3_XX directories need to sum all child
siblings from the SUBL3 domains.

Add a flag to the parent files and pass that down to the routines
that will read values from hardware RMID counters.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h    | 5 ++++-
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 8 +++++---
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 7f05502454c5..4263fbdf7ee7 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -130,6 +130,7 @@ struct mon_evt {
  * @priv:              Used to store monitoring event data in @u
  *                     as kernfs private data
  * @rid:               Resource id associated with the event file
+ * @sumdomains:        Report total of all SNC domains sharing an L3 cache
  * @evtid:             Event id associated with the event file
  * @domid:             The domain to which the event file belongs
  * @u:                 Name of the bit fields struct
@@ -137,7 +138,8 @@ struct mon_evt {
 union mon_data_bits {
 	void *priv;
 	struct {
-		unsigned int rid		: 10;
+		unsigned int rid		: 9;
+		unsigned int sumdomains		: 1;
 		enum resctrl_event_id evtid	: 8;
 		unsigned int domid		: 14;
 	} u;
@@ -149,6 +151,7 @@ struct rmid_read {
 	struct rdt_domain	*d;
 	enum resctrl_event_id	evtid;
 	bool			first;
+	bool			sumdomains;
 	int			err;
 	u64			val;
 	void			*arch_mon_ctx;
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 2bf021d42500..fedcf50df6e5 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -574,6 +574,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	resid = md.u.rid;
 	domid = md.u.domid;
 	evtid = md.u.evtid;
+	rr.sumdomains = md.u.sumdomains;
 
 	r = &rdt_resources_all[resid].r_resctrl;
 	d = rdt_find_domain(r, domid, NULL);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 399dc3175292..3e7f2e36b71e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3059,7 +3059,8 @@ static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
 }
 
 static int mon_add_all_files(struct kernfs_node *kn, struct rdt_domain *d,
-			     struct rdt_resource *r, struct rdtgroup *prgrp)
+			     struct rdt_resource *r, struct rdtgroup *prgrp,
+			     bool sumdomains)
 {
 	union mon_data_bits priv;
 	struct mon_evt *mevt;
@@ -3071,6 +3072,7 @@ static int mon_add_all_files(struct kernfs_node *kn, struct rdt_domain *d,
 
 	priv.u.rid = r->rid;
 	priv.u.domid = d->id;
+	priv.u.sumdomains = sumdomains;
 	list_for_each_entry(mevt, &r->evt_list, list) {
 		priv.u.evtid = mevt->evtid;
 		ret = mon_addfile(kn, mevt->name, priv.priv);
@@ -3109,7 +3111,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 		ret = rdtgroup_kn_set_ugid(kn);
 		if (ret)
 			goto out_destroy;
-		ret = mon_add_all_files(kn, d, r, prgrp);
+		ret = mon_add_all_files(kn, d, r, prgrp, true);
 		if (ret)
 			goto out_destroy;
 	}
@@ -3124,7 +3126,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 	if (ret)
 		goto out_destroy;
 
-	ret = mon_add_all_files(ckn, d, r, prgrp);
+	ret = mon_add_all_files(ckn, d, r, prgrp, false);
 	if (ret)
 		goto out_destroy;
 	kernfs_activate(kn);
-- 
2.44.0