[PATCH 1/2] drm/sched: fix the bug of time out calculation(v4)

[Christian König]

Yes, I think so as well. Andrey can you push this?

Christian.

Am 15.09.21 um 00:59 schrieb Grodzovsky, Andrey:
> AFAIK this one is independent.
>
> Christian, can you confirm ?
>
> Andrey
> ------------------------------------------------------------------------
> *From:* amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of 
> Alex Deucher <alexdeucher at gmail.com>
> *Sent:* 14 September 2021 15:33
> *To:* Christian König <ckoenig.leichtzumerken at gmail.com>
> *Cc:* Liu, Monk <Monk.Liu at amd.com>; amd-gfx list 
> <amd-gfx at lists.freedesktop.org>; Maling list - DRI developers 
> <dri-devel at lists.freedesktop.org>
> *Subject:* Re: [PATCH 1/2] drm/sched: fix the bug of time out 
> calculation(v4)
> Was this fix independent of the other discussions?  Should this be
> applied to drm-misc?
>
> Alex
>
> On Wed, Sep 1, 2021 at 4:42 PM Alex Deucher <alexdeucher at gmail.com> wrote:
> >
> > On Wed, Sep 1, 2021 at 2:50 AM Christian König
> > <ckoenig.leichtzumerken at gmail.com> wrote:
> > >
> > > Am 01.09.21 um 02:46 schrieb Monk Liu:
> > > > issue:
> > > > in cleanup_job the cancle_delayed_work will cancel a TO timer
> > > > even the its corresponding job is still running.
> > > >
> > > > fix:
> > > > do not cancel the timer in cleanup_job, instead do the cancelling
> > > > only when the heading job is signaled, and if there is a "next" job
> > > > we start_timeout again.
> > > >
> > > > v2:
> > > > further cleanup the logic, and do the TDR timer cancelling if 
> the signaled job
> > > > is the last one in its scheduler.
> > > >
> > > > v3:
> > > > change the issue description
> > > > remove the cancel_delayed_work in the begining of the cleanup_job
> > > > recover the implement of drm_sched_job_begin.
> > > >
> > > > v4:
> > > > remove the kthread_should_park() checking in cleanup_job routine,
> > > > we should cleanup the signaled job asap
> > > >
> > > > TODO:
> > > > 1)introduce pause/resume scheduler in job_timeout to serial the 
> handling
> > > > of scheduler and job_timeout.
> > > > 2)drop the bad job's del and insert in scheduler due to above 
> serialization
> > > > (no race issue anymore with the serialization)
> > > >
> > > > tested-by: jingwen <jingwen.chen@@amd.com>
> > > > Signed-off-by: Monk Liu <Monk.Liu at amd.com>
> > >
> > > Reviewed-by: Christian König <christian.koenig at amd.com>
> > >
> >
> > Are you planning to push this to drm-misc?
> >
> > Alex
> >
> >
> > > > ---
> > > >   drivers/gpu/drm/scheduler/sched_main.c | 26 
> +++++++++-----------------
> > > >   1 file changed, 9 insertions(+), 17 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/scheduler/sched_main.c 
> b/drivers/gpu/drm/scheduler/sched_main.c
> > > > index a2a9536..3e0bbc7 100644
> > > > --- a/drivers/gpu/drm/scheduler/sched_main.c
> > > > +++ b/drivers/gpu/drm/scheduler/sched_main.c
> > > > @@ -676,15 +676,6 @@ drm_sched_get_cleanup_job(struct 
> drm_gpu_scheduler *sched)
> > > >   {
> > > >       struct drm_sched_job *job, *next;
> > > >
> > > > -     /*
> > > > -      * Don't destroy jobs while the timeout worker is running  
> OR thread
> > > > -      * is being parked and hence assumed to not touch pending_list
> > > > -      */
> > > > -     if ((sched->timeout != MAX_SCHEDULE_TIMEOUT &&
> > > > - !cancel_delayed_work(&sched->work_tdr)) ||
> > > > -         kthread_should_park())
> > > > -             return NULL;
> > > > -
> > > > spin_lock(&sched->job_list_lock);
> > > >
> > > >       job = list_first_entry_or_null(&sched->pending_list,
> > > > @@ -693,17 +684,21 @@ drm_sched_get_cleanup_job(struct 
> drm_gpu_scheduler *sched)
> > > >       if (job && dma_fence_is_signaled(&job->s_fence->finished)) {
> > > >               /* remove job from pending_list */
> > > > list_del_init(&job->list);
> > > > +
> > > > +             /* cancel this job's TO timer */
> > > > + cancel_delayed_work(&sched->work_tdr);
> > > >               /* make the scheduled timestamp more accurate */
> > > >               next = list_first_entry_or_null(&sched->pending_list,
> > > > typeof(*next), list);
> > > > -             if (next)
> > > > +
> > > > +             if (next) {
> > > > next->s_fence->scheduled.timestamp =
> > > > job->s_fence->finished.timestamp;
> > > > -
> > > > +                     /* start TO timer for next job */
> > > > + drm_sched_start_timeout(sched);
> > > > +             }
> > > >       } else {
> > > >               job = NULL;
> > > > -             /* queue timeout for next job */
> > > > - drm_sched_start_timeout(sched);
> > > >       }
> > > >
> > > > spin_unlock(&sched->job_list_lock);
> > > > @@ -791,11 +786,8 @@ static int drm_sched_main(void *param)
> > > > (entity = drm_sched_select_entity(sched))) ||
> > > > kthread_should_stop());
> > > >
> > > > -             if (cleanup_job) {
> > > > +             if (cleanup_job)
> > > > sched->ops->free_job(cleanup_job);
> > > > -                     /* queue timeout for next job */
> > > > - drm_sched_start_timeout(sched);
> > > > -             }
> > > >
> > > >               if (!entity)
> > > >                       continue;
> > >

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