[Intel-gfx] [PATCH 9/9] drm/i915/pmu: Add RC6 residency metrics

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

For clients like intel-gpu-overlay it is easier to read the
counters via the perf API than having to parse sysfs.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_pmu.c | 31 +++++++++++++++++++++++++++++++
 include/uapi/drm/i915_drm.h     |  6 +++++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 2e049205eb59..312e26095c4b 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -361,6 +361,15 @@ static int i915_pmu_event_init(struct perf_event *event)
 			break;
 		case I915_PMU_INTERRUPTS:
 			break;
+		case I915_PMU_RC6_RESIDENCY:
+			if (!HAS_RC6(i915))
+				ret = -ENODEV;
+			break;
+		case I915_PMU_RC6p_RESIDENCY:
+		case I915_PMU_RC6pp_RESIDENCY:
+			if (!HAS_RC6p(i915))
+				ret = -ENODEV;
+			break;
 		default:
 			ret = -ENOENT;
 			break;
@@ -413,6 +422,24 @@ static u64 __i915_pmu_event_read(struct perf_event *event)
 		case I915_PMU_INTERRUPTS:
 			val = count_interrupts(i915);
 			break;
+		case I915_PMU_RC6_RESIDENCY:
+			intel_runtime_pm_get(i915);
+			val = intel_rc6_residency_ns(i915,
+						     IS_VALLEYVIEW(i915) ?
+						     VLV_GT_RENDER_RC6 :
+						     GEN6_GT_GFX_RC6);
+			intel_runtime_pm_put(i915);
+			break;
+		case I915_PMU_RC6p_RESIDENCY:
+			intel_runtime_pm_get(i915);
+			val = intel_rc6_residency_ns(i915, GEN6_GT_GFX_RC6p);
+			intel_runtime_pm_put(i915);
+			break;
+		case I915_PMU_RC6pp_RESIDENCY:
+			intel_runtime_pm_get(i915);
+			val = intel_rc6_residency_ns(i915, GEN6_GT_GFX_RC6pp);
+			intel_runtime_pm_put(i915);
+			break;
 		}
 	}
 
@@ -677,6 +704,10 @@ static struct attribute *i915_pmu_events_attrs[] = {
 
 	I915_EVENT_ATTR(interrupts, I915_PMU_INTERRUPTS),
 
+	I915_EVENT(rc6-residency,   I915_PMU_RC6_RESIDENCY,   "ns"),
+	I915_EVENT(rc6p-residency,  I915_PMU_RC6p_RESIDENCY,  "ns"),
+	I915_EVENT(rc6pp-residency, I915_PMU_RC6pp_RESIDENCY, "ns"),
+
 	NULL,
 };
 
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 8aceb7f57e0c..709f28fc0970 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -134,7 +134,11 @@ enum drm_i915_pmu_engine_sample {
 
 #define I915_PMU_INTERRUPTS		__I915_PMU_OTHER(2)
 
-#define I915_PMU_LAST I915_PMU_INTERRUPTS
+#define I915_PMU_RC6_RESIDENCY		__I915_PMU_OTHER(3)
+#define I915_PMU_RC6p_RESIDENCY		__I915_PMU_OTHER(4)
+#define I915_PMU_RC6pp_RESIDENCY	__I915_PMU_OTHER(5)
+
+#define I915_PMU_LAST I915_PMU_RC6pp_RESIDENCY
 
 /* Each region is a minimum of 16k, and there are at most 255 of them.
  */
-- 
2.9.5