linux-kernel - Re: Radeon regression in 6.6 kernel

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Date:   Tue, 28 Nov 2023 23:44:57 -0500
From:   Luben Tuikov <ltuikov89@...il.com>
To:     Alex Deucher <alexdeucher@...il.com>,
        Phillip Susi <phill@...susis.net>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        Christian König <ckoenig.leichtzumerken@...il.com>,
        linux-kernel@...r.kernel.org,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        ltuikov89@...il.com
Subject: Re: Radeon regression in 6.6 kernel

On 2023-11-28 17:13, Alex Deucher wrote:
> On Mon, Nov 27, 2023 at 6:24 PM Phillip Susi <phill@...susis.net> wrote:
>>
>> Alex Deucher <alexdeucher@...il.com> writes:
>>
>>>> In that case those are the already known problems with the scheduler
>>>> changes, aren't they?
>>>
>>> Yes.  Those changes went into 6.7 though, not 6.6 AFAIK.  Maybe I'm
>>> misunderstanding what the original report was actually testing.  If it
>>> was 6.7, then try reverting:
>>> 56e449603f0ac580700621a356d35d5716a62ce5
>>> b70438004a14f4d0f9890b3297cd66248728546c
>>
>> At some point it was suggested that I file a gitlab issue, but I took
>> this to mean it was already known and being worked on.  -rc3 came out
>> today and still has the problem.  Is there a known issue I could track?
>>
> 
> At this point, unless there are any objections, I think we should just
> revert the two patches
Uhm, no.

Why "the two" patches?

This email, part of this thread,

https://lore.kernel.org/all/87r0kircdo.fsf@vps.thesusis.net/

clearly states that reverting *only* this commit,
56e449603f0ac5 drm/sched: Convert the GPU scheduler to variable number of run-queues
*does not* mitigate the failed suspend. (Furthermore, this commit doesn't really change
anything operational, other than using an allocated array, instead of a static one, in DRM,
while the 2nd patch is solely contained within the amdgpu driver code.)

Leaving us with only this change,
b70438004a14f4 drm/amdgpu: move buffer funcs setting up a level
to be at fault, as the kernel log attached in the linked email above shows.

The conclusion is that only b70438004a14f4 needs reverting.
-- 
Regards,
Luben

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