linux-kernel - [PATCH v4 21/31] x86/resctrl: Add fourth part of telemetry event enumeration

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Message-ID: <20250429003359.375508-22-tony.luck@intel.com>
Date: Mon, 28 Apr 2025 17:33:47 -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 21/31] x86/resctrl: Add fourth part of telemetry event enumeration

At run time when a user reads an event file the file system code
provides the enum resctrl_event_id for the event.

Create a lookup table indexed by event id to provide the telem_entry
structure and the event index into MMIO space.

Enable the events marked as readable from any CPU.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/intel_aet.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/resctrl/intel_aet.c
index 37dd493df250..e1cb6bd4788d 100644
--- a/arch/x86/kernel/cpu/resctrl/intel_aet.c
+++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c
@@ -97,6 +97,16 @@ static struct event_group *known_event_groups[] = {
 
 #define NUM_KNOWN_GROUPS ARRAY_SIZE(known_event_groups)
 
+/**
+ * struct evtinfo - lookup table from resctrl_event_id to useful information
+ * @event_group:	Pointer to the telem_entry structure for this event
+ * @idx:		Counter index within each per-RMID block of counters
+ */
+static struct evtinfo {
+	struct event_group	*event_group;
+	int			idx;
+} evtinfo[QOS_NUM_EVENTS];
+
 static void free_mmio_info(struct mmio_info **mmi)
 {
 	int num_pkgs = topology_max_packages();
@@ -167,7 +177,16 @@ static bool configure_events(struct event_group *e, struct pmt_feature_group *p)
 	}
 	e->pkginfo = no_free_ptr(pkginfo);
 
-	return false;
+	for (int i = 0; i < e->num_events; i++) {
+		enum resctrl_event_id evt;
+
+		evt = e->evts[i].evtid;
+		evtinfo[evt].event_group = e;
+		evtinfo[evt].idx = e->evts[i].evt_idx;
+		resctrl_enable_mon_event(evt, true);
+	}
+
+	return true;
 }
 
 DEFINE_FREE(intel_pmt_put_feature_group, struct pmt_feature_group *,	\
-- 
2.48.1