[Intel-gfx] [PATCH] drm/i915: Park the breadcrumbs signaler across a GPU reset

[Chris Wilson]

On Sun, Feb 12, 2017 at 12:44:49AM +0000, Chris Wilson wrote:
> The signal threads may be running concurrently with the GPU reset. The
> completion from the GPU run asynchronous with the reset and two threads
> may see different snapshots of the state, and the signaler may mark a
> request as complete as we try to reset it. We don't tolerate 2 different
> views of the same state and complain if we try to mark a request as
> failed if it is already complete. Disable the signal threads during
> reset to prevent this conflict (even though the conflict implies that
> the state we resetting to is invalid, we have already made our
> decision!).
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=99671
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala at intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Also
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99733
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre