linux-kernel - Re: [PATCH v1] drm/scheduler: Don't kill jobs in interrupt context

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Message-ID: <ef88ec2c-77b5-fa0d-49d1-fdd2451713b7@collabora.com>
Date:   Tue, 17 May 2022 12:03:39 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Erico Nunes <nunes.erico@...il.com>,
        Steven Price <steven.price@....com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Rob Herring <robh@...nel.org>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Rob Clark <robdclark@...il.com>,
        Andrey Grodzovsky <andrey.grodzovsky@....com>,
        Dmitry Osipenko <digetx@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v1] drm/scheduler: Don't kill jobs in interrupt context

On 5/17/22 10:40, Erico Nunes wrote:
> On Wed, Apr 13, 2022 at 12:05 PM Steven Price <steven.price@....com> wrote:
>>
>> On 11/04/2022 23:15, Dmitry Osipenko wrote:
>>> Interrupt context can't sleep. Drivers like Panfrost and MSM are taking
>>> mutex when job is released, and thus, that code can sleep. This results
>>> into "BUG: scheduling while atomic" if locks are contented while job is
>>> freed. There is no good reason for releasing scheduler's jobs in IRQ
>>> context, hence use normal context to fix the trouble.
>>>
>>> Cc: stable@...r.kernel.org
>>> Fixes: 542cff7893a3 ("drm/sched: Avoid lockdep spalt on killing a processes")
>>> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
>>
>> Reviewed-by: Steven Price <steven.price@....com>
> 
> Is there something blocking this patch?
> Mesa CI is still hitting the issue and I have been waiting for it to
> be applied/backported to update CI with it.
> Thanks

If this patch won't be picked up anytime soon, then I'll include it into
my "memory shrinker" patchset together with the rest of the fixes, so it
won't get lost.

-- 
Best regards,
Dmitry