i915_gem_clflush_object
bool i915_gem_clflush_object(struct drm_i915_gem_object *obj,
i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
i915_gem_clflush_object(obj, I915_CLFLUSH_FORCE);
if (i915_gem_clflush_object(obj, 0))