drm/i915: Clear GPU read domains on reset

Clear the GPU read domain for the inactive objects on a reset so that
they are correctly invalidated on reuse.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_drv.c

@@ -391,6 +391,11 @@ int i965_reset(struct drm_device *dev, u8 flags)
 	 */
 	i915_gem_reset_flushing_list(dev);
 
+	/* Move everything out of the GPU domains to ensure we do any
+	 * necessary invalidation upon reuse.
+	 */
+	i915_gem_reset_inactive_gpu_domains(dev);
+
 	/*
 	 * Set the domains we want to reset (GRDOM/bits 2 and 3) as
 	 * well as the reset bit (GR/bit 0).  Setting the GR bit

drivers/gpu/drm/i915/i915_drv.h

@@ -998,6 +998,7 @@ int i915_gem_object_put_fence_reg(struct drm_gem_object *obj,
 				  bool interruptible);
 void i915_gem_retire_requests(struct drm_device *dev);
 void i915_gem_reset_flushing_list(struct drm_device *dev);
+void i915_gem_reset_inactive_gpu_domains(struct drm_device *dev);
 void i915_gem_clflush_object(struct drm_gem_object *obj);
 int i915_gem_object_set_domain(struct drm_gem_object *obj,
 			       uint32_t read_domains,

drivers/gpu/drm/i915/i915_gem.c

@@ -1699,6 +1699,19 @@ void i915_gem_reset_flushing_list(struct drm_device *dev)
 	}
 }
 
+void i915_gem_reset_inactive_gpu_domains(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_i915_gem_object *obj_priv;
+
+	list_for_each_entry(obj_priv,
+			    &dev_priv->mm.inactive_list,
+			    list)
+	{
+		obj_priv->base.read_domains &= ~I915_GEM_GPU_DOMAINS;
+	}
+}
+
 /**
  * This function clears the request list as sequence numbers are passed.
  */