linux-kernel - Re: AMD graphics performance regression in 4.15 and later

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Message-ID: <76a30815-28e3-e798-03de-a3cdfade4c64@mozilla.com>
Date:   Mon, 9 Apr 2018 11:17:43 -0400
From:   Jean-Marc Valin <jmvalin@...illa.com>
To:     christian.koenig@....com, airlied@...ux.ie,
        alexander.deucher@....com, Felix.Kuehling@....com,
        labbott@...hat.com, akpm@...ux-foundation.org,
        michel.daenzer@....com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: AMD graphics performance regression in 4.15 and later

On 04/09/2018 05:42 AM, Christian König wrote:
> Backporting all the detection logic is to invasive, but you could just
> go into drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c and forcefull use the
> other code path.
> 
> Just look out for "#ifdef CONFIG_SWIOTLB" checks and disable those.

Do you mean just taking the 4.15 code as is and replacing
"#ifdef CONFIG_SWIOTLB" with "#if 0" in
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c or are you talking about using a
different version of drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c ?

	Jean-Marc