[intel-gem] Recover resources from wedged hardware.

Clean up queues, free objects. On the next entervt, unmark the hardware to
let the user try again (presumably after resetting the chip). Someday we'll
automatically recover...

1 files changed, 21 insertions, 2 deletions

diff --git a/linux-core/i915_gem.c b/linux-core/i915_gem.c
index 4dfbd2a1..16a1b07e 100644
--- a/linux-core/i915_gem.c
+++ b/linux-core/i915_gem.c
@@ -653,7 +653,7 @@ i915_gem_retire_requests(struct drm_device *dev)
 					   list);
 		retiring_seqno = request->seqno;
 
-		if (i915_seqno_passed(seqno, retiring_seqno)) {
+		if (i915_seqno_passed(seqno, retiring_seqno) || dev_priv->mm.wedged) {
 			i915_gem_retire_request(dev, request);
 
 			list_del(&request->list);
@@ -697,10 +697,13 @@ i915_wait_request(struct drm_device *dev, uint32_t seqno)
 		i915_user_irq_on(dev_priv);
 		ret = wait_event_interruptible(dev_priv->irq_queue,
 					       i915_seqno_passed(i915_get_gem_seqno(dev),
-								 seqno));
+								 seqno) || dev_priv->mm.wedged);
 		i915_user_irq_off(dev_priv);
 		dev_priv->mm.waiting_gem_seqno = 0;
 	}
+	if (dev_priv->mm.wedged)
+		ret = -EIO;
+
 	if (ret)
 		DRM_ERROR("%s returns %d (awaiting %d at %d)\n",
 			  __func__, ret, seqno, i915_get_gem_seqno(dev));
@@ -1019,6 +1022,8 @@ i915_gem_evict_something(struct drm_device *dev)
 						   list);
 
 			ret = i915_wait_request(dev, request->seqno);
+			if (ret)
+				break;
 
 			/* if waiting caused an object to become inactive,
 			 * then loop around and wait for it. Otherwise, we
@@ -1822,6 +1827,13 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
 	mutex_lock(&dev->struct_mutex);
 
 	i915_verify_inactive(dev, __FILE__, __LINE__);
+
+	if (dev_priv->mm.wedged) {
+		DRM_ERROR("Execbuf while wedged\n");
+		mutex_unlock(&dev->struct_mutex);
+		return -EIO;
+	}
+		
 	if (dev_priv->mm.suspended) {
 		DRM_ERROR("Execbuf while VT-switched.\n");
 		mutex_unlock(&dev->struct_mutex);
@@ -2264,6 +2276,8 @@ i915_gem_idle(struct drm_device *dev)
 		if (last_seqno == cur_seqno) {
 			if (stuck++ > 100) {
 				DRM_ERROR("hardware wedged\n");
+				dev_priv->mm.wedged = 1;
+				DRM_WAKEUP(&dev_priv->irq_queue);
 				break;
 			}
 		}
@@ -2378,6 +2392,11 @@ i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	int ret;
 
+	if (dev_priv->mm.wedged) {
+		DRM_ERROR("Renabling wedged hardware, good luck\n");
+		dev_priv->mm.wedged = 0;
+	}
+
 	ret = i915_gem_init_ringbuffer(dev);
 	if (ret != 0)
 		return ret;