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Message-ID: <7339b7a1-2d1c-4379-89a0-daf8b28d81c8@baylibre.com>
Date: Thu, 3 Oct 2019 10:34:19 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: "Grodzovsky, Andrey" <Andrey.Grodzovsky@....com>,
Hillf Danton <hdanton@...a.com>
Cc: "daniel@...ll.ch" <daniel@...ll.ch>,
"airlied@...ux.ie" <airlied@...ux.ie>,
"Koenig, Christian" <Christian.Koenig@....com>,
Erico Nunes <nunes.erico@...il.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"steven.price@....com" <steven.price@....com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
Rob Herring <robh@...nel.org>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>,
"open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>
Subject: Re: drm_sched with panfrost crash on T820
Hi Andrey,
Le 02/10/2019 à 16:40, Grodzovsky, Andrey a écrit :
>
> 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);
>
This fixed the problem on the 10 CI runs.
Neil
>
> 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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