RE: [REGRESSION] AMD GPU regression in 5.16.18..5.17.4

From: "Deucher, Alexander" <Alexander.Deucher@amd.com>
To: Demi Marie Obenour <demi@invisiblethingslab.com>,
	Thorsten Leemhuis <regressions@leemhuis.info>,
	Greg KH <gregkh@linuxfoundation.org>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>,
	"regressions@lists.linux.dev" <regressions@lists.linux.dev>,
	"amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>,
	"Koenig,  Christian" <Christian.Koenig@amd.com>
Subject: RE: [REGRESSION] AMD GPU regression in 5.16.18..5.17.4
Date: Mon, 25 Apr 2022 21:29:54 +0000	[thread overview]
Message-ID: <BL1PR12MB5144A5433CD3495A3B74F30AF7F89@BL1PR12MB5144.namprd12.prod.outlook.com> (raw)
In-Reply-To: <YmXfqrktdufyYC4r@itl-email>

[Public]

> -----Original Message-----
> From: Demi Marie Obenour <demi@invisiblethingslab.com>
> Sent: Sunday, April 24, 2022 7:39 PM
> To: Thorsten Leemhuis <regressions@leemhuis.info>; Greg KH 
> <gregkh@linuxfoundation.org>
> Cc: amd-gfx@lists.freedesktop.org; regressions@lists.linux.dev; 
> Deucher, Alexander <Alexander.Deucher@amd.com>; Koenig, Christian 
> <Christian.Koenig@amd.com>; Pan, Xinhui <Xinhui.Pan@amd.com>
> Subject: Re: [REGRESSION] AMD GPU regression in 5.16.18..5.17.4
> 
> On Sun, Apr 24, 2022 at 11:02:43AM +0200, Thorsten Leemhuis wrote:
> > CCing the amdgpu maintainers
> >
> > On 24.04.22 08:12, Greg KH wrote:
> > > On Sat, Apr 23, 2022 at 12:06:33PM -0400, Demi Marie Obenour wrote:
> > >> Two Qubes OS users reported that their AMD GPU systems did not 
> > >> work on 5.17.4, while 5.16.18 worked fine.  Details can be found 
> > >> on https://github.com/QubesOS/qubes-issues/issues/7462.  The 
> > >> initial report listed the GPU as “Advanced Micro Devices, Inc. 
> > >> [AMD/ATI] Renoir [1002:1636} (rev d3) (prog-if 00 [VGA 
> > >> controller])” and the CPU as “AMD Ryzen 5 PRO 4650U with Radeon Graphics”.
> > >>
> > >> #regzbot introduced: v5.16.18..v5.17.4
> > >
> > > That's a big range, can you use 'git bisect' to track it down?
> >
> > FWIW, in another mail in this thread and
> > https://github.com/QubesOS/qubes-issues/issues/7462#issuecomment-
> 11076
> > 81126 it was clarified that the problem was introduced between 
> > 5.17.3 and 5.17.4, where a few amdgpu changes were applied. Maybe 
> > they are the reason.
> >
> > Anyway: Yes, as Gregkh said, a bisection really would help. But 
> > maybe the amdgfx developers might already have an idea what might be 
> > wrong here? The QubesOS ticket linked above has some more details.
> 
> The reporter was able to bisect the regression.  I am not surprised 
> that this commit caused problems for Qubes OS, as dom0 in Qubes OS is 
> technically a guest of Xen.
> 
> #regzbot ^introduced: b818a5d374542ccec73dcfe578a081574029820e

Can you please follow up on the bug ticket:
https://gitlab.freedesktop.org/drm/amd/-/issues/1985
It will be easier to track everything there.

Alex