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SubjectRe: drm_sched with panfrost crash on T820
Date

On 9/30/19 10:52 AM, Hillf Danton wrote:
> On Mon, 30 Sep 2019 11:17:45 +0200 Neil Armstrong wrote:
>> Did a new run from 5.3:
>>
>> [ 35.971972] Call trace:
>> [ 35.974391] drm_sched_increase_karma+0x5c/0xf0
>> ffff000010667f38 FFFF000010667F94
>> drivers/gpu/drm/scheduler/sched_main.c:335
>>
>> The crashing line is :
>> if (bad->s_fence->scheduled.context ==
>> entity->fence_context) {
>>
>> Doesn't seem related to guilty job.
> Bail out if s_fence is no longer fresh.
>
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -333,6 +333,10 @@ void drm_sched_increase_karma(struct drm
>
> spin_lock(&rq->lock);
> list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
> + if (!smp_load_acquire(&bad->s_fence)) {
> + spin_unlock(&rq->lock);
> + return;
> + }
> if (bad->s_fence->scheduled.context ==
> entity->fence_context) {
> if (atomic_read(&bad->karma) >
> @@ -543,7 +547,7 @@ EXPORT_SYMBOL(drm_sched_job_init);
> void drm_sched_job_cleanup(struct drm_sched_job *job)
> {
> dma_fence_put(&job->s_fence->finished);
> - job->s_fence = NULL;
> + smp_store_release(&job->s_fence, 0);
> }
> EXPORT_SYMBOL(drm_sched_job_cleanup);


Does this change help the problem ? Note that drm_sched_job_cleanup is
called from scheduler thread which is stopped at all times when work_tdr
thread is running and anyway the 'bad' job is still in the
ring_mirror_list while it's being accessed from 
drm_sched_increase_karma so I don't think drm_sched_job_cleanup can be
called for it BEFORE or while drm_sched_increase_karma is executed.

Andrey


>
> --
>
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