linux-kernel - [PATCH v3 17/26] x86/resctrl: Build a lookup table for each resctrl event id

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Message-ID: <20250407234032.241215-18-tony.luck@intel.com>
Date: Mon,  7 Apr 2025 16:40:19 -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 17/26] x86/resctrl: Build a lookup table for each resctrl event id

User requests to read events arrive from the file system layer
with a domain id, RMID, and resctrl event id. Responding to
those requests needs information from various structures.

Build a quick lookup table indexed by resctrl event id.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/intel_aet.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/resctrl/intel_aet.c
index fb03f2e76306..44d2fe747ed8 100644
--- a/arch/x86/kernel/cpu/resctrl/intel_aet.c
+++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c
@@ -67,6 +67,12 @@ struct telem_entry {
 	struct pmt_event evts[];
 };
 
+/* Lookup table to get from resctrl event id to useful structures */
+static struct evtinfo {
+	struct telem_entry	*telem_entry;
+	struct pmt_event	*pmt_event;
+} evtinfo[QOS_NUM_EVENTS];
+
 /* All known telemetry event groups */
 static struct telem_entry *telem_entry[] = {
 	NULL
@@ -151,6 +157,7 @@ bool intel_aet_get_events(void)
 	struct pmt_feature_group *p2 __free(intel_pmt_put_feature_group) = NULL;
 	struct pkg_info *pkg __free(free_pkg_info) = NULL;
 	int num_pkgs = topology_max_packages();
+	struct telem_entry **tentry;
 	bool use_p1, use_p2;
 	int slot;
 
@@ -184,6 +191,17 @@ bool intel_aet_get_events(void)
 			slot = setup(pkg, i, p2, slot);
 	}
 
+	for (tentry = telem_entry; *tentry; tentry++) {
+		if (!(*tentry)->active)
+			continue;
+		for (int i = 0; i < (*tentry)->num_events; i++) {
+			enum resctrl_event_id evtid = (*tentry)->evts[i].evtid;
+
+			evtinfo[evtid].telem_entry = *tentry;
+			evtinfo[evtid].pmt_event = &(*tentry)->evts[i];
+		}
+	}
+
 	if (use_p1)
 		feat_energy = no_free_ptr(p1);
 	if (use_p2)
-- 
2.48.1