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drm/i915/pmu: Skip sampling engines if gt is asleep

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If the whole GT is asleep, we know that each engine must also be asleep
and so we can quickly return without checking them all.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191218000756.3475668-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-12-18 00:07:56 +00:00
parent 54d7195f8c
commit edb1ecad77
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_pmu.c
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@ -312,6 +312,9 @@ engines_sample(struct intel_gt *gt, unsigned int period_ns)
if ((i915->pmu.enable & ENGINE_SAMPLE_MASK) == 0)
return;
if (!intel_gt_pm_is_awake(gt))
return;
for_each_engine(engine, gt, id) {
struct intel_engine_pmu *pmu = &engine->pmu;
spinlock_t *mmio_lock;