[PATCH] drm/i915: Before pageflip, also wait for shared dmabuf fences.

[Chris Wilson]

On Thu, Sep 08, 2016 at 02:14:43AM +0200, Mario Kleiner wrote:
> amdgpu-kms uses shared fences for its prime exported dmabufs,
> instead of an exclusive fence. Therefore we need to wait for
> all fences of the dmabuf reservation object to prevent
> unsynchronized rendering and flipping.

No. Fix the root cause as this affects not just flips but copies -
this implies that everybody using the resv object must wait for all
fences. The resv object is not just used for prime, but all fencing, so
this breaks the ability to schedule parallel operations across engine.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre