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drm/i915: Simplify checking of GPU reset_counter in display pageflips 

If we, when we store the reset_counter for the operation, we ensure that
it is not in a wedged or in the middle of a reset, we can then assert that
if any reset occurs the reset_counter must change. Later we can just
compare the operation's reset epoch against the current counter to see
if we need to abort the operation (to handle the hang).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1460565315-7748-5-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-04-13 17:35:04 +01:00
parent c19ae989b0
commit 7f1847ebf4
1 changed files with 9 additions and 7 deletions
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16
drivers/gpu/drm/i915/intel_display.c
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@ -3198,14 +3198,12 @@ void intel_finish_reset(struct drm_device *dev)
static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
unsigned reset_counter;
bool pending;
reset_counter = i915_reset_counter(&dev_priv->gpu_error);
if (intel_crtc->reset_counter != reset_counter ||
__i915_reset_in_progress_or_wedged(reset_counter))
reset_counter = i915_reset_counter(&to_i915(dev)->gpu_error);
if (intel_crtc->reset_counter != reset_counter)
return false;
spin_lock_irq(&dev->event_lock);
@ -10913,8 +10911,7 @@ static bool page_flip_finished(struct intel_crtc *crtc)
unsigned reset_counter;
reset_counter = i915_reset_counter(&dev_priv->gpu_error);
if (crtc->reset_counter != reset_counter ||
__i915_reset_in_progress_or_wedged(reset_counter))
if (crtc->reset_counter != reset_counter)
return true;
/*
@ -11576,8 +11573,13 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
if (ret)
goto cleanup;
atomic_inc(&intel_crtc->unpin_work_count);
intel_crtc->reset_counter = i915_reset_counter(&dev_priv->gpu_error);
if (__i915_reset_in_progress_or_wedged(intel_crtc->reset_counter)) {
ret = -EIO;
goto cleanup;
}
atomic_inc(&intel_crtc->unpin_work_count);
if (INTEL_INFO(dev)->gen >= 5 || IS_G4X(dev))
work->flip_count = I915_READ(PIPE_FLIPCOUNT_G4X(pipe)) + 1;