linux-kernel - [PATCH v4 17/31] x86/resctrl: Add second part of telemetry event enumeration

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Message-ID: <20250429003359.375508-18-tony.luck@intel.com>
Date: Mon, 28 Apr 2025 17:33:43 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghuay@...dia.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>,
	Anil Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Chen Yu <yu.c.chen@...el.com>
Cc: x86@...nel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v4 17/31] x86/resctrl: Add second part of telemetry event enumeration

There may be multiple telemetry aggregators per package, each enumerated
by a telemetry region structure in the feature group.

Scan the array of telemetry region structures and count how many are
in each package in preparation to allocate structures to save the MMIO
addresses for each in a convenient format for use when reading event
counters.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/intel_aet.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/resctrl/intel_aet.c
index dda44baf75ae..a0365c3ce982 100644
--- a/arch/x86/kernel/cpu/resctrl/intel_aet.c
+++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c
@@ -52,6 +52,27 @@ static struct event_group *known_event_groups[] = {
 
 static bool configure_events(struct event_group *e, struct pmt_feature_group *p)
 {
+	int *pkgcounts __free(kfree) = NULL;
+	struct telemetry_region *tr;
+	int num_pkgs;
+
+	num_pkgs = topology_max_packages();
+	pkgcounts = kcalloc(num_pkgs, sizeof(*pkgcounts), GFP_KERNEL);
+	if (!pkgcounts)
+		return false;
+
+	/* Get per-package counts of telemetry_region for this guid */
+	for (int i = 0; i < p->count; i++) {
+		tr = &p->regions[i];
+		if (tr->guid != e->guid)
+			continue;
+		if (tr->plat_info.package_id >= num_pkgs) {
+			pr_warn_once("Bad package %d\n", tr->plat_info.package_id);
+			continue;
+		}
+		pkgcounts[tr->plat_info.package_id]++;
+	}
+
 	return false;
 }
 
-- 
2.48.1