On Thu, 4 Jun 2020 at 11:38, Chris Wilson <[email protected]> wrote:
>
> If the execbuf is interrupted after building the cmdparser pipeline, and
> before we commit to submitting the request to HW, we would attempt to
> clean up the cmdparser early. While we held active references to the vma
> being parsed and constructed, we did not hold an active reference for
> the buffer pool itself. The result was that an interrupted execbuf could
> still have run the cmdparser pipeline, but since the buffer pool was
> idle, its target vma could have been recycled.
>
> Note this problem only occurs if the cmdparser is running async due to
> pipelined waits on busy fences, and the execbuf is interrupted.
>
> Fixes: 686c7c35abc2 ("drm/i915/gem: Asynchronous cmdparser")
> Fixes: 16e87459673a ("drm/i915/gt: Move the batch buffer pool from the engine
> to the gt")
> Signed-off-by: Chris Wilson <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
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