From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
When turning off the engines, and the pmu sampling, clear the previous
value as the current measurement should be 0.
v2: Use a for-loop
v3:
* Move clearing to timer self-dis-arm to avoid race with parking.
* Clear frequency samples as well.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Suggested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_pmu.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index f1e932a3fb85..1a52a3d0e5a9 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -262,13 +262,31 @@ static void frequency_sample(struct drm_i915_private *dev_priv)
}
}
+static void clear_previous_samples(struct drm_i915_private *i915)
+{
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ unsigned int i;
+
+ for_each_engine(engine, i915, id) {
+ for (i = 0; i < ARRAY_SIZE(engine->pmu.sample); i++)
+ engine->pmu.sample[i].prev = 0;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(i915->pmu.sample); i++)
+ i915->pmu.sample[i].prev = 0;
+}
+
static enum hrtimer_restart i915_sample(struct hrtimer *hrtimer)
{
struct drm_i915_private *i915 =
container_of(hrtimer, struct drm_i915_private, pmu.timer);
- if (!READ_ONCE(i915->pmu.timer_enabled))
+ if (!READ_ONCE(i915->pmu.timer_enabled)) {
+ clear_previous_samples(i915);
+
return HRTIMER_NORESTART;
+ }
engines_sample(i915);
frequency_sample(i915);
--
2.14.1
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