drm/i915: Don't wait for page flips if there was GPU reset
If a GPU reset occurs while a page flip has been submitted to the ring,
the flip will never complete once the ring has been reset.
The GPU reset can be detected by sampling the reset_counter before the
flip is submitted, and then while waiting for the flip, the sampled
counter is compared with the current reset_counter value.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
[danvet: Move the reset_counter assignment to an earlier place in
common code as discussed on the mailing list.]
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=60140
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6dfb49c..593c668 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2868,10 +2868,12 @@
{
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 long flags;
bool pending;
- if (i915_reset_in_progress(&dev_priv->gpu_error))
+ if (i915_reset_in_progress(&dev_priv->gpu_error) ||
+ intel_crtc->reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter))
return false;
spin_lock_irqsave(&dev->event_lock, flags);
@@ -7250,6 +7252,7 @@
work->enable_stall_check = true;
atomic_inc(&intel_crtc->unpin_work_count);
+ intel_crtc->reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
ret = dev_priv->display.queue_flip(dev, crtc, fb, obj);
if (ret)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 13afb37d..006b5aa 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -235,6 +235,9 @@
/* We can share PLLs across outputs if the timings match */
struct intel_pch_pll *pch_pll;
uint32_t ddi_pll_sel;
+
+ /* reset counter value when the last flip was submitted */
+ unsigned int reset_counter;
};
struct intel_plane {