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drm/i915: Track GT wakeref

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Record the wakeref used for keeping the device awake as the GPU is
executing requests and be sure to cancel the tracking upon parking.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190114142129.24398-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-01-14 14:21:11 +00:00
parent 16e4dd0342
commit 506d1f6245
2 changed files with 8 additions and 5 deletions
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2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1979,7 +1979,7 @@ struct drm_i915_private {
* In order to reduce the effect on performance, there
* is a slight delay before we do so.
*/
bool awake;
intel_wakeref_t awake;
/**
* The number of times we have woken up.

11
drivers/gpu/drm/i915/i915_gem.c
View File

@ -138,6 +138,8 @@ int i915_mutex_lock_interruptible(struct drm_device *dev)
static u32 __i915_gem_park(struct drm_i915_private *i915)
{
intel_wakeref_t wakeref;
GEM_TRACE("\n");
lockdep_assert_held(&i915->drm.struct_mutex);
@ -168,14 +170,15 @@ static u32 __i915_gem_park(struct drm_i915_private *i915)
i915_pmu_gt_parked(i915);
i915_vma_parked(i915);
i915->gt.awake = false;
wakeref = fetch_and_zero(&i915->gt.awake);
GEM_BUG_ON(!wakeref);
if (INTEL_GEN(i915) >= 6)
gen6_rps_idle(i915);
intel_display_power_put(i915, POWER_DOMAIN_GT_IRQ);
intel_runtime_pm_put_unchecked(i915);
intel_runtime_pm_put(i915, wakeref);
return i915->gt.epoch;
}
@ -204,7 +207,8 @@ void i915_gem_unpark(struct drm_i915_private *i915)
if (i915->gt.awake)
return;
intel_runtime_pm_get_noresume(i915);
i915->gt.awake = intel_runtime_pm_get_noresume(i915);
GEM_BUG_ON(!i915->gt.awake);
/*
* It seems that the DMC likes to transition between the DC states a lot
@ -219,7 +223,6 @@ void i915_gem_unpark(struct drm_i915_private *i915)
*/
intel_display_power_get(i915, POWER_DOMAIN_GT_IRQ);
i915->gt.awake = true;
if (unlikely(++i915->gt.epoch == 0)) /* keep 0 as invalid */
i915->gt.epoch = 1;