linux-kernel - Re: [git pull] drm for 6.1-rc1

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Message-ID: <CADnq5_N0Ef+1VUoDLdpHfJXqZFuPYbx5Lq+94NWciHcQC+VrMg@mail.gmail.com>
Date:   Thu, 6 Oct 2022 16:14:02 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Dave Airlie <airlied@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [git pull] drm for 6.1-rc1

On Thu, Oct 6, 2022 at 3:48 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Thu, Oct 6, 2022 at 12:28 PM Alex Deucher <alexdeucher@...il.com> wrote:
> >
> > Maybe you are seeing this which is an issue with GPU TLB flushes which
> > is kind of sporadic:
> > https://gitlab.freedesktop.org/drm/amd/-/issues/2113
>
> Well, that seems to be 5.19, and while timing changes (or whatever
> other software updates) could have made it start trigger, this machine
> has been pretty solid otgerwise.
>
> > Are you seeing any GPU page faults in your kernel log?
>
> Nothing even remotely like that "no-retry page fault" in that issue
> report. Of course, if it happens just before the whole thing locks
> up...

Your chip is too old to support retry faults so it's likely you could
be just seeing a GPU page fault followed by a hang.  Your chip also
lacks a paging queue, so you would be affected by the TLB issue.

Alex