drm/i915: Implement GPU reset on i965

This patch puts in place the machinery to attempt to reset the GPU. This
will be used when attempting to recover from a GPU hang.

Signed-off-by: Owain G. Ainsworth <oga@openbsd.org>
Signed-off-by: Ben Gamari <bgamari.foss@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 77e42e719d7..2a042bc173f 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -482,6 +482,14 @@ static void i915_handle_error(struct drm_device *dev)
                 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
         }
 
+        if (dev_priv->mm.wedged) {
+                /*
+                 * Wakeup waiting processes so they don't hang
+                 */
+                printk("i915: Waking up sleeping processes\n");
+                DRM_WAKEUP(&dev_priv->irq_queue);
+        }
+
         queue_work(dev_priv->wq, &dev_priv->error_work);
 }