On 09/12/2019 02:32, Chris Wilson wrote:
In order to avoid confusing the HW, we must never submit an empty ring
during lite-restore, that is we should always advance the RING_TAIL
before submitting to stay ahead of the RING_HEAD.
Normally this is prevented by keeping a couple of spare NOPs in
Quoting Tvrtko Ursulin (2019-12-10 10:00:34)
>
> On 09/12/2019 02:32, Chris Wilson wrote:
> > In order to avoid confusing the HW, we must never submit an empty ring
> > during lite-restore, that is we should always advance the RING_TAIL
> > before submitting to stay ahead of the RING_HEAD.
> >
>
In order to avoid confusing the HW, we must never submit an empty ring
during lite-restore, that is we should always advance the RING_TAIL
before submitting to stay ahead of the RING_HEAD.
Normally this is prevented by keeping a couple of spare NOPs in the
request->wa_tail so that on resubmission
Quoting Chris Wilson (2019-12-09 02:01:45)
> In order to avoid confusing the HW, we must never submit an empty ring
> during lite-restore, that is we should always advance the RING_TAIL
> before submitting to stay ahead of the RING_HEAD.
>
> Normally this is prevented by keeping a couple of spare
In order to avoid confusing the HW, we must never submit an empty ring
during lite-restore, that is we should always advance the RING_TAIL
before submitting to stay ahead of the RING_HEAD.
Normally this is prevented by keeping a couple of spare NOPs in the
request->wa_tail so that on resubmission
