i915_gem_object_set_to_cpu_domain
i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write);
ret = i915_gem_object_set_to_cpu_domain(obj, true);
err = i915_gem_object_set_to_cpu_domain(obj, write_domain);
ret = i915_gem_object_set_to_cpu_domain(obj, false);
err = i915_gem_object_set_to_cpu_domain(state->obj, false);
WARN_ON(i915_gem_object_set_to_cpu_domain(obj, true));
ret = i915_gem_object_set_to_cpu_domain(obj, false);
err = i915_gem_object_set_to_cpu_domain(obj, write);
ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true);
ret = i915_gem_object_set_to_cpu_domain(vma->obj, true);