linux-kernel - [PATCH v18 14/17] x86/resctrl: Sum monitor data acrss Sub-NUMA (SNC) nodes when needed

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Date: Wed, 15 May 2024 15:23:22 -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>,
	Dave Martin <Dave.Martin@....com>
Cc: x86@...nel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v18 14/17] x86/resctrl: Sum monitor data acrss Sub-NUMA (SNC) nodes when needed

When the sumdomains fields is set in the rmid_read structure, walk
the list of domains in this resource to find all that share an L3
cache id (rr->display_id).

Adjust the RMID value based on which SNC domain is being accessed.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 20 +++++++++++---
 arch/x86/kernel/cpu/resctrl/monitor.c     | 33 ++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 3b9383612c35..7ab788d47ad3 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -575,15 +575,27 @@ 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.sum;
 	r = &rdt_resources_all[resid].r_resctrl;
-	hdr = rdt_find_domain(&r->mon_domains, domid, NULL);
-	if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
+
+	if (rr.sumdomains) {
+		rr.display_id = domid;
+		list_for_each_entry(d, &r->mon_domains, hdr.list) {
+			if (d->display_id == domid)
+				goto got_domain;
+		}
 		ret = -ENOENT;
 		goto out;
+	} else {
+		hdr = rdt_find_domain(&r->mon_domains, domid, NULL);
+		if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
+			ret = -ENOENT;
+			goto out;
+		}
+		d = container_of(hdr, struct rdt_mon_domain, hdr);
 	}
-	d = container_of(hdr, struct rdt_mon_domain, hdr);
 
+got_domain:
 	mon_event_read(&rr, r, d, rdtgrp, evtid, false);
 
 	if (rr.err == -EIO)
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 0f66825a1ac9..668d2fdf58cd 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -546,7 +546,7 @@ static struct mbm_state *get_mbm_state(struct rdt_mon_domain *d, u32 closid,
 	}
 }
 
-static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
+static int ___mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 {
 	struct mbm_state *m;
 	u64 tval = 0;
@@ -569,6 +569,37 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 	return 0;
 }
 
+static u32 get_node_rmid(struct rdt_resource *r, struct rdt_mon_domain *d, u32 rmid)
+{
+	int cpu = cpumask_any(&d->hdr.cpu_mask);
+
+	return rmid + (cpu_to_node(cpu) % snc_nodes_per_l3_cache) * r->num_rmid;
+}
+
+static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
+{
+	struct rdt_mon_domain *d;
+	u32 node_rmid;
+	int ret = 0;
+
+	if (!rr->sumdomains) {
+		node_rmid = get_node_rmid(rr->r, rr->d, rmid);
+		return ___mon_event_count(closid, node_rmid, rr);
+	}
+
+	list_for_each_entry(d, &rr->r->mon_domains, hdr.list) {
+		if (d->display_id != rr->display_id)
+			continue;
+		rr->d = d;
+		node_rmid = get_node_rmid(rr->r, d, rmid);
+		ret = ___mon_event_count(closid, node_rmid, rr);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
 /*
  * mbm_bw_count() - Update bw count from values previously read by
  *		    __mon_event_count().
-- 
2.44.0