[PATCH v14 7/7] drm/xe/pmu: Add GT C6 events

[Lucas De Marchi <lucas.demarchi@intel.com>]

From: Vinay Belgaumkar <vinay.belgaumkar@intel.com>

Provide a PMU interface for GT C6 residency counters. The implementation
is ported over from the i915 PMU code. Residency is provided in units of
ms(like sysfs entry in - /sys/class/drm/card0/device/tile0/gt0/gtidle).

Sample usage and output:

	$ perf list | grep gt-c6
	  xe_0000_00_02.0/gt-c6-residency/                   [Kernel PMU event]

	$ tail /sys/bus/event_source/devices/xe_0000_00_02.0/events/gt-c6-residency*
	==> /sys/bus/event_source/devices/xe_0000_00_02.0/events/gt-c6-residency <==
	event=0x01

	==> /sys/bus/event_source/devices/xe_0000_00_02.0/events/gt-c6-residency.unit <==
	ms

	$ perf stat -e xe_0000_00_02.0/gt-c6-residency,gt=0/ -I1000
	#           time             counts unit events
	     1.001196056              1,001 ms   xe_0000_00_02.0/gt-c6-residency,gt=0/
	     2.005216219              1,003 ms   xe_0000_00_02.0/gt-c6-residency,gt=0/

Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 drivers/gpu/drm/xe/xe_pmu.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_pmu.c b/drivers/gpu/drm/xe/xe_pmu.c
index 8d938d67c1f2c..a2e4addd3dd7e 100644
--- a/drivers/gpu/drm/xe/xe_pmu.c
+++ b/drivers/gpu/drm/xe/xe_pmu.c
@@ -11,6 +11,7 @@
 #include "xe_device.h"
 #include "xe_force_wake.h"
 #include "xe_gt_clock.h"
+#include "xe_gt_idle.h"
 #include "xe_gt_printk.h"
 #include "xe_mmio.h"
 #include "xe_macros.h"
@@ -122,12 +123,16 @@ static int xe_pmu_event_init(struct perf_event *event)
 static u64 __xe_pmu_event_read(struct perf_event *event)
 {
 	struct xe_gt *gt = event_to_gt(event);
-	u64 val = 0;
 
 	if (!gt)
 		return 0;
 
-	return val;
+	switch (config_to_event_id(event->attr.config)) {
+	case XE_PMU_EVENT_GT_C6_RESIDENCY:
+		return xe_gt_idle_residency_msec(&gt->gtidle);
+	}
+
+	return 0;
 }
 
 static void xe_pmu_event_update(struct perf_event *event)
@@ -268,6 +273,10 @@ static const struct attribute_group pmu_events_attr_group = {
 
 static void set_supported_events(struct xe_pmu *pmu)
 {
+	struct xe_device *xe = container_of(pmu, typeof(*xe), pmu);
+
+	if (!xe->info.skip_guc_pc)
+		pmu->supported_events |= BIT_ULL(XE_PMU_EVENT_GT_C6_RESIDENCY);
 }
 
 /**
-- 
2.48.0