Can you elaborate on what is the tricky part with the lock ? I assumed we just use per scheduler lock.
Andrey On 10/30/19 10:50 AM, Christian König wrote: > A lock inside the scheduler is rather tricky to implement. > > What you need to do is to get rid of the park()/unpark() hack in > drm_sched_entity_fini(). > > We could do this with a struct completion or convert the scheduler > from a thread to a work item. > > Regards, > Christian. > > Am 30.10.19 um 15:44 schrieb Grodzovsky, Andrey: >> That good as proof of RCA but I still think we should grab a dedicated >> lock inside scheduler since the race is internal to scheduler code so >> this better to handle it inside the scheduler code to make the fix apply >> for all drivers using it. >> >> Andrey >> >> On 10/30/19 4:44 AM, S, Shirish wrote: >>>>>> We still have it and isn't doing kthread_park()/unpark() from >>>>>> drm_sched_entity_fini while GPU reset in progress defeats all the >>>>>> purpose of drm_sched_stop->kthread_park ? If >>>>>> drm_sched_entity_fini-> kthread_unpark happens AFTER >>>>>> drm_sched_stop->kthread_park nothing prevents from another (third) >>>>>> thread keep submitting job to HW which will be picked up by the >>>>>> unparked scheduler thread try to submit to HW but fail because the >>>>>> HW ring is deactivated. >>>>>> >>>>>> If so maybe we should serialize calls to >>>>>> kthread_park/unpark(sched->thread) ? >>>>>> >>>>> Yeah, that was my thinking as well. Probably best to just grab the >>>>> reset lock before calling drm_sched_entity_fini(). >>>> >>>> Shirish - please try locking &adev->lock_reset around calls to >>>> drm_sched_entity_fini as Christian suggests and see if this actually >>>> helps the issue. >>>> >>> Yes that also works. >>> >>> Regards, >>> >> _______________________________________________ >> amd-gfx mailing list >> amd-gfx@lists.freedesktop.org >> https://lists.freedesktop.org/mailman/listinfo/amd-gfx > _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
