[PATCH 04/13] drm/i915: Release all atomic flips when GPU hangs

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

If the GPU hangs, release all pending atomic flips from the queue.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c     |    1 +
 drivers/gpu/drm/i915/intel_atomic.c |   29 +++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h    |    1 +
 3 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 441306d..f70d2b1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1452,6 +1452,7 @@ void i915_handle_error(struct drm_device *dev, bool wedged)
 		 */
 		for_each_ring(ring, dev_priv, i)
 			wake_up_all(&ring->irq_queue);
+		intel_atomic_wedged(dev);
 	}
 
 	queue_work(dev_priv->wq, &dev_priv->error_work);
diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index 04a20c5..7a0e315 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -2250,6 +2250,30 @@ void intel_atomic_notify_ring(struct drm_device *dev,
 	spin_unlock_irqrestore(&dev_priv->flip.lock, flags);
 }
 
+void intel_atomic_wedged(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_flip *intel_flip;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev_priv->flip.lock, flags);
+
+	list_for_each_entry(intel_flip, &dev_priv->flip.list, base.list) {
+		struct intel_ring_buffer *ring = intel_flip->ring;
+
+		if (ring) {
+			intel_flip->ring = NULL;
+			ring->irq_put(ring);
+		}
+	}
+
+	/* all flips are "ready" so no need to check with intel_atomic_flips_ready() */
+	if (!list_empty(&dev_priv->flip.list))
+		queue_work(dev_priv->flip.wq, &dev_priv->flip.work);
+
+	spin_unlock_irqrestore(&dev_priv->flip.lock, flags);
+}
+
 static void atomic_pipe_commit(struct drm_device *dev,
 			       struct intel_atomic_state *state,
 			       int pipe)
@@ -2427,6 +2451,11 @@ static void atomic_pipe_commit(struct drm_device *dev,
 	if (rings_mask == 0)
 		return;
 
+	if (atomic_read(&dev_priv->mm.wedged)) {
+		intel_atomic_wedged(dev);
+		return;
+	}
+
 	/*
 	 * Double check to catch cases where the irq
 	 * fired before the flip was placed onto flip.list.
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 319aac8..617ba4d 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -723,6 +723,7 @@ extern void intel_atomic_free_events(struct drm_device *dev, struct drm_file *fi
 extern void intel_atomic_handle_vblank(struct drm_device *dev, int pipe);
 extern void intel_atomic_clear_flips(struct drm_crtc *crtc);
 extern void intel_atomic_notify_ring(struct drm_device *dev, struct intel_ring_buffer *ring);
+extern void intel_atomic_wedged(struct drm_device *dev);
 
 extern void intel_enable_primary(struct drm_crtc *crtc);
 extern void intel_disable_primary(struct drm_crtc *crtc);
-- 
1.7.8.6