+/* some bookkeeping */
+static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
+ size_t size)
+{
+ dev_priv->mm.object_count++;
+ dev_priv->mm.object_memory += size;
+}
+
+static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
+ size_t size)
+{
+ dev_priv->mm.object_count--;
+ dev_priv->mm.object_memory -= size;
+}
+
+static void i915_gem_info_add_gtt(struct drm_i915_private *dev_priv,
+ size_t size)
+{
+ dev_priv->mm.gtt_count++;
+ dev_priv->mm.gtt_memory += size;
+}
+
+static void i915_gem_info_remove_gtt(struct drm_i915_private *dev_priv,
+ size_t size)
+{
+ dev_priv->mm.gtt_count--;
+ dev_priv->mm.gtt_memory -= size;
+}
+
+static void i915_gem_info_add_pin(struct drm_i915_private *dev_priv,
+ size_t size)
+{
+ dev_priv->mm.pin_count++;
+ dev_priv->mm.pin_memory += size;
+}
+
+static void i915_gem_info_remove_pin(struct drm_i915_private *dev_priv,
+ size_t size)
+{
+ dev_priv->mm.pin_count--;
+ dev_priv->mm.pin_memory -= size;
+}
+
+int
+i915_gem_check_is_wedged(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct completion *x = &dev_priv->error_completion;
+ unsigned long flags;
+ int ret;
+
+ if (!atomic_read(&dev_priv->mm.wedged))
+ return 0;
+
+ ret = wait_for_completion_interruptible(x);
+ if (ret)
+ return ret;
+
+ /* Success, we reset the GPU! */
+ if (!atomic_read(&dev_priv->mm.wedged))
+ return 0;
+
+ /* GPU is hung, bump the completion count to account for
+ * the token we just consumed so that we never hit zero and
+ * end up waiting upon a subsequent completion event that
+ * will never happen.
+ */
+ spin_lock_irqsave(&x->wait.lock, flags);
+ x->done++;
+ spin_unlock_irqrestore(&x->wait.lock, flags);
+ return -EIO;
+}
+
+static int i915_mutex_lock_interruptible(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int ret;
+
+ ret = i915_gem_check_is_wedged(dev);
+ if (ret)
+ return ret;
+
+ ret = mutex_lock_interruptible(&dev->struct_mutex);
+ if (ret)
+ return ret;
+
+ if (atomic_read(&dev_priv->mm.wedged)) {
+ mutex_unlock(&dev->struct_mutex);
+ return -EAGAIN;
+ }
+
+ WARN_ON(i915_verify_lists(dev));
+ return 0;
+}
+