[PATCH] drm/etnaviv: bring back progress check in job timeout handler

[Eric Anholt]

Lucas Stach <l.stach at pengutronix.de> writes:

> Am Mittwoch, den 27.06.2018, 10:25 -0700 schrieb Eric Anholt:
>> > Lucas Stach <l.stach at pengutronix.de> writes:
>> 
>> > When the hangcheck handler was replaced by the DRM scheduler timeout
>> > handling we dropped the forward progress check, as this might allow
>> > clients to hog the GPU for a long time with a big job.
>> > 
>> > It turns out that even reasonably well behaved clients like the
>> > Armada Xorg driver occasionally trip over the 500ms timeout. Bring
>> > back the forward progress check to get rid of the userspace regression.
>> > 
>> > We would still like to fix userspace to submit smaller batches
>> > if possible, but that is for another day.
>> > 
>> > Fixes: 6d7a20c07760 (drm/etnaviv: replace hangcheck with scheduler timeout)
>> > Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
>> 
>> I was just wondering if there was a way to do this with the scheduler (I
>> had a similar issue with GTF-GLES2.gtf.GL.acos.acos_float_vert_xvary),
>> and this looks correct.
>
> What are you thinking about? A forward progress check at sub-fence
> granularity is always going to be GPU specific. The only thing that
> could be shunted to the scheduler is rearming of the timer. We could do
> this by changing the return type of timedout_job to something that
> allows us to indicate a false-positive to the scheduler.

That sounds like a nice future improvement.
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