drm/i915: Capture the overlay status upon a GPU hang.

v2: Add the interrupt status and address.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 85785a8..854ab1e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -489,6 +489,7 @@
 	i915_error_object_free(error->batchbuffer[1]);
 	i915_error_object_free(error->ringbuffer);
 	kfree(error->active_bo);
+	kfree(error->overlay);
 	kfree(error);
 }
 
@@ -667,6 +668,8 @@
 
 	do_gettimeofday(&error->time);
 
+	error->overlay = intel_overlay_capture_error_state(dev);
+
 	spin_lock_irqsave(&dev_priv->error_lock, flags);
 	if (dev_priv->first_error == NULL) {
 		dev_priv->first_error = error;