linux-kernel - Re: Linux 6.1-rc1 drm/amdgpu regression

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Message-ID: <bf250f10-fecf-7d42-e308-e817ee7a6a3a@linuxfoundation.org>
Date:   Wed, 19 Oct 2022 19:16:31 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: Linux 6.1-rc1 drm/amdgpu regression

On 10/19/22 15:24, Deucher, Alexander wrote:
> [Public]
> 
>> -----Original Message-----
>> From: Shuah Khan <skhan@...uxfoundation.org>
>> Sent: Wednesday, October 19, 2022 5:00 PM
>> To: Deucher, Alexander <Alexander.Deucher@....com>
>> Cc: Linus Torvalds <torvalds@...ux-foundation.org>; linux-
>> kernel@...r.kernel.org; Shuah Khan <skhan@...uxfoundation.org>
>> Subject: Re: Linux 6.1-rc1 drm/amdgpu regression
>>
>> On 10/19/22 14:27, Deucher, Alexander wrote:
>>> [AMD Official Use Only - General]
>>>
>>>> -----Original Message-----
>>>> From: Shuah Khan <skhan@...uxfoundation.org>
>>>> Sent: Wednesday, October 19, 2022 4:00 PM
>>>> To: Deucher, Alexander <Alexander.Deucher@....com>
>>>> Cc: Linus Torvalds <torvalds@...ux-foundation.org>; Shuah Khan
>>>> <skhan@...uxfoundation.org>; linux-kernel@...r.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@....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@....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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitl
>> ab.freedesktop.org%2Fdrm%2Famd%2F-
>> %2Fissues&amp;data=05%7C01%7CAlexander.Deucher%40amd.com%7C61b
>> 64b1be7294b27eb2308dab214dbe2%7C3dd8961fe4884e608e11a82d994e183d
>> %7C0%7C0%7C638018099904584274%7CUnknown%7CTWFpbGZsb3d8eyJWIj
>> oiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3
>> 000%7C%7C%7C&amp;sdata=ZYA0bWZAGsxB91Bqcg1YAI704LhpISQX63bE67
>> UVO%2Bs%3D&amp;reserved=0) 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.
>>
> 
> Actually I think I see what's wrong.  Can you try the attached patch?
> 

This patch worked. Clean boot without any warns and timer expiry messages
from drm/amdgpu.

thanks,
-- Shuah