Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
In-Reply-To: <CAEJqkgjfhmjwYo74xivsfgvoPQUFh2dFeXFwtEKoN+DXG1riMg@mail.gmail.com>
References: <c743b220-0395-eef3-4405-a21cdbe8eee1@mozilla.com>
 <9ca940f1-7f21-c420-de45-13d72e783ab6@amd.com> <a96df0b8-fc22-4438-646d-2f0096dfcc84@mozilla.com>
 <6cebabff-908f-5ebe-4252-760773c4cd6f@amd.com> <312ed341-7052-a61e-331f-d1e8fd5b477e@mozilla.com>
 <d136f940-d807-d2f7-30a7-8617f130912d@amd.com> <77866d66-2728-8295-d7ee-9975dbf64b99@mozilla.com>
 <55e1712b-6567-50c5-3789-53dd1ccddb94@gmail.com> <CAEJqkgiOR3aCGoNquVeEyC1BLMBPmXNjgrmjNeeE9UVfzcJKzg@mail.gmail.com>
 <CAEJqkgjfhmjwYo74xivsfgvoPQUFh2dFeXFwtEKoN+DXG1riMg@mail.gmail.com>
From:   Gabriel C <nix.or.die@gmail.com>
Date:   Wed, 6 Jun 2018 13:28:51 +0200
Message-ID: <CAEJqkgiVdeBf9konX4OJi59dYp4y_b+J02ns=yf-D6tjtZ7P1g@mail.gmail.com>
Subject: Re: AMD graphics performance regression in 4.15 and later
To:     =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>
Cc:     Jean-Marc Valin <jmvalin@mozilla.com>,
        Dave Airlie <airlied@linux.ie>, alexander.deucher@amd.com,
        Felix Kuehling <Felix.Kuehling@amd.com>,
        Laura Abbott <labbott@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        michel.daenzer@amd.com, dri-devel@lists.freedesktop.org,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

2018-04-11 7:02 GMT+02:00 Gabriel C <nix.or.die@gmail.com>:
>>2018-04-11 6:00 GMT+02:00 Gabriel C <nix.or.die@gmail.com>:
>> 2018-04-09 11:42 GMT+02:00 Christian K=C3=B6nig <ckoenig.leichtzumerken@=
gmail.com>:
>>> Am 07.04.2018 um 00:00 schrieb Jean-Marc Valin:
> ...
>> I can help testing code for 4.17/++ if you wish but that is *different* =
storry.
>>
>
> Quick tested an 4.16.0-11490-gb284d4d5a678 , amdgpu and radeon driver
> are broken now in this one.
>
> radeon tells:
>
> ...
>
> [    6.337838] [drm] PCIE GART of 2048M enabled (table at 0x00000000001D6=
000).
> [    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.

Also I played with BIOS options also which does not fix anything but
changes the error message.

IOMMU && SR-IOV disabled the error changes to this :

[    7.092044] [drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0
test failed (scratch(0x850C)=3D0xCAFEDEAD)
[    7.092059] radeon 0000:21:00.0: disabling GPU acceleration


While I could workaround SWIOTLB bugs in 4.15 and 4.16 , 4.17 seems to
kill the GPU with no way
for me to make it work ( at least I could not find any workaround by now )

BR