linux-kernel - Re: g33: GPU hangs

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Date:	Wed, 18 Jan 2012 12:43:08 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	Jiri Slaby <jslaby@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: g33: GPU hangs

On Wed, Jan 18, 2012 at 10:31:42AM +0100, Jiri Slaby wrote:
> On 12/01/2011 01:47 PM, Chris Wilson wrote:
> > On Thu, 01 Dec 2011 13:30:18 +0100, Jiri Slaby <jslaby@...e.cz> wrote:
> >> Hi,
> >>
> >> both yesterday and today, my GPU hung. Both happened when I opened
> >> google front page in firefox.
> >>
> >> I'm running 3.2.0-rc3-next-20111130. Given it happened twice in the past
> >> 24 hours, it looks like a regression from next-20111124. Or is this a
> >> userspace issue (I might updated some packages)?
> >>
> >> i915_error_state dumps from the two hangs are here:
> >> http://www.fi.muni.cz/~xslaby/sklad/panics/915_error_state_0
> >> http://www.fi.muni.cz/~xslaby/sklad/panics/915_error_state_second
> > 
> > Both error states contain the same bug: a fence register in conflict
> > with the command stream. The batch is using the buffer at 0x03d0000 
> > as an untiled 40x40 rgba buffer with pitch 192. However, a fence
> > register is programmed to
> >   fence[3] = 03d00001
> >     valid, x-tiled, pitch: 512, start: 0x03d00000, size: 1048576
> > 
> > Also note that buffer is also not listed as currently active, so
> > presumably we reused the buffer as tiled (and so reprogrammed the
> > fence registered) before the GPU retired the batch. That sounds eerily
> > similar to this bug:
> > 
> > From 2b76187d2f5fc2352e391914b1828f91f93bb356 Mon Sep 17 00:00:00 2001
> > From: Chris Wilson <chris@...is-wilson.co.uk>
> > Date: Tue, 29 Nov 2011 15:12:16 +0000
> > Subject: [PATCH] drm/i915: Only clear the GPU domains upon a successful
> >  finish
> 
> Hi, do you plan to push this patch upstream? Or am I supposed to not use
> it anymore?

It's on track to get merged to drm-intel-next. I'll probably pick it up in a week
or so.
-Daniel
-- 
Daniel Vetter
Mail: daniel@...ll.ch
Mobile: +41 (0)79 365 57 48
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