linux-kernel - [PATCH v3 16/26] x86/resctrl: Third phase of telemetry event enumeration

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Message-ID: <20250407234032.241215-17-tony.luck@intel.com>
Date: Mon,  7 Apr 2025 16:40:18 -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>
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v3 16/26] x86/resctrl: Third phase of telemetry event enumeration

Allocate per-package arrays for the known telemetry_regions and
initialize with pointers to the structures acquired from the
intel_pmt_get_regions_by_feature() calls.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/intel_aet.c | 38 +++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/resctrl/intel_aet.c
index 9d414dd40f8b..fb03f2e76306 100644
--- a/arch/x86/kernel/cpu/resctrl/intel_aet.c
+++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c
@@ -108,6 +108,30 @@ static bool count_events(struct pkg_info *pkg, int max_pkgs, struct pmt_feature_
 	return found;
 }
 
+/*
+ * Copy the pointers to telemetry regions associated with a given package
+ * and with known guids over to the pkg_info structure for that package.
+ */
+static int setup(struct pkg_info *pkg, int pkgnum, struct pmt_feature_group *p, int slot)
+{
+	struct telem_entry **tentry;
+
+	for (int i = 0; i < p->count; i++) {
+		for (tentry = telem_entry; *tentry; tentry++) {
+			if (!(*tentry)->active)
+				continue;
+			if (pkgnum != p->regions[i].plat_info.package_id)
+				continue;
+			if (p->regions[i].guid != (*tentry)->guid)
+				continue;
+
+			pkg[pkgnum].regions[slot++] =  p->regions[i];
+		}
+	}
+
+	return slot;
+}
+
 DEFINE_FREE(intel_pmt_put_feature_group, struct pmt_feature_group *,	\
 	if (!IS_ERR_OR_NULL(_T))					\
 		intel_pmt_put_feature_group(_T))
@@ -128,6 +152,7 @@ bool intel_aet_get_events(void)
 	struct pkg_info *pkg __free(free_pkg_info) = NULL;
 	int num_pkgs = topology_max_packages();
 	bool use_p1, use_p2;
+	int slot;
 
 	pkg = kcalloc(num_pkgs, sizeof(*pkg_info), GFP_KERNEL);
 	if (!pkg)
@@ -146,6 +171,19 @@ bool intel_aet_get_events(void)
 		return false;
 	}
 
+	for (int i = 0; i < num_pkgs; i++) {
+		if (!pkg[i].count)
+			continue;
+		pkg[i].regions = kmalloc_array(pkg[i].count, sizeof(*pkg[i].regions), GFP_KERNEL);
+		if (!pkg[i].regions)
+			return false;
+		slot = 0;
+		if (use_p1)
+			slot = setup(pkg, i, p1, slot);
+		if (use_p2)
+			slot = setup(pkg, i, p2, slot);
+	}
+
 	if (use_p1)
 		feat_energy = no_free_ptr(p1);
 	if (use_p2)
-- 
2.48.1