[Intel-gfx] [PATCH 2/2] drm/i915: add syncobj timeline support

[Chris Wilson]

Quoting Lionel Landwerlin (2019-05-23 12:46:20)
> -               syncobj = drm_syncobj_find(file, fence.handle);
> -               if (!syncobj) {
> -                       DRM_DEBUG("Invalid syncobj handle provided\n");
> -                       err = -ENOENT;
> -                       goto err;
> +                       if (user_fence.flags & __I915_EXEC_FENCE_UNKNOWN_FLAGS) {
> +                               err = -EINVAL;
> +                               goto err;
> +                       }
> +
> +                       if (user_fence.flags & I915_EXEC_FENCE_WAIT) {
> +                               err = drm_syncobj_find_fence(
> +                                       file, user_fence.handle, user_fence.value,
> +                                       DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT,
> +                                       &syncobj, &fence);

Is this still a synchronous wait? That would be an unfortunate change in
behaviour and antithesis to having a scheduler.
-Chris