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drm/i915/pmu: Clear the previous sample value when parking 

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.
v4:
 * Init frequency to idle_freq. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v3)
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171123102654.29296-1-tvrtko.ursulin@linux.intel.com
This commit is contained in:
Tvrtko Ursulin 2017-11-23 10:26:54 +00:00
parent b552ae444e
commit fbba5559d9
1 changed files with 21 additions and 1 deletions
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22
drivers/gpu/drm/i915/i915_pmu.c
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@ -262,13 +262,31 @@ static void frequency_sample(struct drm_i915_private *dev_priv)
}
}
static void pmu_init_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 = i915->gt_pm.rps.idle_freq;
}
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)) {
pmu_init_previous_samples(i915);
return HRTIMER_NORESTART;
}
engines_sample(i915);
frequency_sample(i915);
@ -839,6 +857,8 @@ void i915_pmu_register(struct drm_i915_private *i915)
hrtimer_init(&i915->pmu.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
i915->pmu.timer.function = i915_sample;
pmu_init_previous_samples(i915);
for_each_engine(engine, i915, id)
INIT_DELAYED_WORK(&engine->pmu.disable_busy_stats,
__disable_busy_stats);