Am 27.05.2016 um 00:19 schrieb Marek Olšák:
On Fri, May 27, 2016 at 12:13 AM, Alex Deucher <[email protected]> wrote:
On Thu, May 26, 2016 at 5:51 PM, Marek Olšák <[email protected]> wrote:
From: Marek Olšák <[email protected]>
SDMA submission somehow interacts with the skipping CE preamble logic.
This is a workaround for current kernels which have the bug.
Sadly, I can't see what's wrong with the kernel driver. The CE preamble
handling there looks good to me.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95545
What exactly is going wrong? Is the kernel not scheduling the
preamble or is the ordering wrong or something else?
There are VM faults for addresses that are too far away from memory
allocated by the process.
It looks like the contents of CE RAM come from a different process,
which suggests that the CE preamble IB was skipped.
Disabling the CE preamble IB means that the preamble packets are added
to the main CE IB instead, which makes the problem go away.
Just a guess, but does commit 9f8fb5a2b339ba83493991ca8f1173a939a696d3
in Alex drm-next-4.7 tree helps with the problem?
commit 9f8fb5a2b339ba83493991ca8f1173a939a696d3
Author: Christian König <[email protected]>
Date: Fri May 6 14:52:57 2016 +0200
drm/amdgpu: move preamble IB handling into common code
This fixes the handling which was completely broken when you
ad more than one preamble IB.
Regards,
Christian.
Marek
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