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Date:   Wed, 19 Oct 2022 14:59:45 -0600
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Subject: Re: Linux 6.1-rc1 drm/amdgpu regression
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To:     "Deucher, Alexander" <Alexander.Deucher@amd.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Shuah Khan <skhan@linuxfoundation.org>
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From:   Shuah Khan <skhan@linuxfoundation.org>
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On 10/19/22 14:27, Deucher, Alexander wrote:
> [AMD Official Use Only - General]
> 
>> -----Original Message-----
>> From: Shuah Khan <skhan@linuxfoundation.org>
>> Sent: Wednesday, October 19, 2022 4:00 PM
>> To: Deucher, Alexander <Alexander.Deucher@amd.com>
>> Cc: Linus Torvalds <torvalds@linux-foundation.org>; Shuah Khan
>> <skhan@linuxfoundation.org>; linux-kernel@vger.kernel.org
>> Subject: Linux 6.1-rc1 drm/amdgpu regression
>>
>> Hi Alex,
>>
>> I am seeing the same problem I sent reverts for on 5.10.147 on Linux 6.1-rc1
>> on my laptop with AMD Ryzen 7 PRO 5850U with Radeon Graphics.
>>
>> commit e3163bc8ffdfdb405e10530b140135b2ee487f89
>> Author: Alex Deucher <alexander.deucher@amd.com>
>> Date:   Fri Sep 9 11:53:27 2022 -0400
>>
>>       drm/amdgpu: move nbio sdma_doorbell_range() into sdma code for vega
>>
>> I see that the following has been reverted in Linux 6.1-rc1
>>
>> commit 66f99628eb24409cb8feb5061f78283c8b65f820
>> Author: Hamza Mahfooz <hamza.mahfooz@amd.com>
>> Date:   Tue Sep 6 15:01:49 2022 -0400
>>
>>       drm/amdgpu: use dirty framebuffer helper
>>
>> However I still see the following filling dmesg and system is unusable.
>> For now I switched back to Linux 6.0 as this is my primary system.
>>
>> [drm] Fence fallback timer expired on ring sdma0 [drm] Fence fallback timer
>> expired on ring gfx [drm] Fence fallback timer expired on ring sdma0 [drm]
>> Fence fallback timer expired on ring gfx [drm] Fence fallback timer expired
>> on ring sdma0 [drm] Fence fallback timer expired on ring sdma0 [drm] Fence
>> fallback timer expired on ring sdma0 [drm] Fence fallback timer expired on
>> ring gfx
>>
>> Please let me know if I should send revert for this for the mainline as well.
>>
> 
> Can you file a bug report (https://gitlab.freedesktop.org/drm/amd/-/issues) and attach your dmesg output?  I'd like to try and repro the issue if I can and provide some patches to test.  I'd like to avoid reverting the patch as that will break the driver for users using vega dGPUs.

Makes sense. I will file the bug and aattach dmesg. Since this is my
primary system, there will be some delay in getting this info. to you
and testing any patches you provide for testing.

thanks,
-- Shuah