linux-kernel - Re: Kernel and ADM hardware roulette ( was AMD graphics performance regression in 4.15 and later )

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Date:   Wed, 6 Jun 2018 16:12:15 +0200
From:   Michel Dänzer <michel.daenzer@....com>
To:     Gabriel C <nix.or.die@...il.com>,
        Christian König <christian.koenig@....com>
Cc:     Jean-Marc Valin <jmvalin@...illa.com>,
        Dave Airlie <airlied@...ux.ie>, alexander.deucher@....com,
        Felix Kuehling <Felix.Kuehling@....com>,
        Laura Abbott <labbott@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        dri-devel@...ts.freedesktop.org,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Kernel and ADM hardware roulette ( was AMD graphics performance
 regression in 4.15 and later )

On 2018-06-06 03:33 PM, Gabriel C wrote:
> 2018-06-06 14:19 GMT+02:00 Christian König <christian.koenig@....com>:
>> Am 06.06.2018 um 14:08 schrieb Gabriel C:
>>> 2018-06-06 13:33 GMT+02:00 Christian König <christian.koenig@....com>:
>>>> Am 06.06.2018 um 13:28 schrieb Gabriel C:
>>>>> 2018-04-11 7:02 GMT+02:00 Gabriel C <nix.or.die@...il.com>:
>>>>>>
>>>>>> [    6.337838] [drm] PCIE GART of 2048M enabled (table at
>>>>>> 0x00000000001D6000).
>>>>>> [    6.338210] radeon 0000:21:00.0: (-12) create WB bo failed
>>>>>> [    6.338214] radeon 0000:21:00.0: disabling GPU acceleration
>>>>>>
>>>>>> ...
>>>>>>
>>>>> I have the same Issue now on final 4.17.

Please file a bug report, and ideally bisect which commit(s) introduced 
the issue(s).


>>> http://ftp.frugalware.org/pub/other/people/crazy/radeon/dmesg-iommu-sr-iov-off.txt
>>>
>>> http://ftp.frugalware.org/pub/other/people/crazy/radeon/dmesg-iommu-sr-iov-on.txt
>>>
>>> Also nothing else changed in that setup just testing kernel 4.17.
>>
>>
>> That has nothing TODO with the driver nor the original bug you reported. The
>> problem is that SME is active and that is currently not supported at all
>> with a that hardware.
> 
> Ok .. so are we playing now kernel an AMD Hardware roulette on each release ?
> 
> SME was like this in kernel 4.16.x here and all worked.

If that is true, again please bisect which commit broke it.

All the reports I've seen before this indicated that at least amdgpu has 
never worked with SME (which BTW doesn't mean it's never going to work 
or that we don't want to support it, just that as far as we know it's 
currently not working).


-- 
Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer