[PATCH v5 1/2] drm/sched: Refactor ring mirror list handling.

Grodzovsky, Andrey Andrey.Grodzovsky at amd.com
Fri Jan 11 15:37:22 UTC 2019

On 01/11/2019 04:42 AM, Koenig, Christian wrote:
> Am 10.01.19 um 16:56 schrieb Grodzovsky, Andrey:
>> [SNIP]
>>>>> But we will not be adding the cb back in drm_sched_stop anymore, now we
>>>>> are only going to add back the cb in drm_sched_startr after rerunning
>>>>> those jobs in drm_sched_resubmit_jobs and assign them a new parent
>>>>> there
>>>>> anyway.
>>>> Yeah, but when we find that we don't need to reset anything anymore
>>>> then adding the callbacks again won't be possible any more.
>>>> Christian.
>>> I am not sure I understand it, can u point me to example of how this
>>> will happen ? I am attaching my latest patches with waiting only for
>>> the last job's fence here just so we are on same page regarding the code.
> Well the whole idea is to prepare all schedulers, then check once more
> if the offending job hasn't completed in the meantime.
> If the job completed we need to be able to rollback everything and
> continue as if nothing had happened.
> Christian.

Oh, but this piece of functionality - skipping HW ASIC reset in case the 
guilty job done is totally missing form this patch series and so needs 
to be added. So what you say actually is that for the case were we skip 
HW asic reset because the guilty job did complete we also need to skipĀ  
resubmitting the jobs in drm_sched_resubmit_jobs and hence preserve the 
old parent fence pointer for reuse ? If so I would like to add all this 
functionality as a third patch since the first 2 patches are more about 
resolving race condition with jobs in flight while doing reset - what do 
you think ?

>>> Andrey
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