[Intel-gfx] [PATCH 10/24] drm/i915: Disable EXEC_OBJECT_ASYNC when doing relocations

[Joonas Lahtinen]

On to, 2017-05-18 at 10:46 +0100, Chris Wilson wrote:
> If we write a relocation into the buffer, we require our own implicit
> synchronisation added after the start of the execbuf, outside of the
> user's control. As we may end up clflushing, or doing the patch itself
> on the GPU, asynchronously we need to look at the implicit serialisation
> on obj->resv and hence need to disable EXEC_OBJECT_ASYNC for this
> object.
> 
> If the user does trigger a stall for relocations, we make sure the stall
> is complete enough so that the batch is not submitted before we complete
> those relocations.
> 
> Fixes: 77ae9957897d ("drm/i915: Enable userspace to opt-out of implicit fencing")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Jason Ekstrand <jason at jlekstrand.net>

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation