From: Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de>
To: Jerome Glisse <glisse@freedesktop.org>
Subject: Re: radeon KMS causes GART Table Walk Errors (was: K8 ECC error with linux-2.6.32)
Date: Thu, 24 Dec 2009 20:04:41 +0100
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Cc: linux-kernel@vger.kernel.org, airlied@linux.ie,
       dri-devel@lists.sourceforge.net
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Am Freitag 18 Dezember 2009 15:44:35 schrieb Jerome Glisse:
> On Fri, Dec 18, 2009 at 02:47:00PM +0100, Johannes Hirte wrote:
> > Am Mittwoch 16 Dezember 2009 20:31:48 schrieb Johannes Hirte:
> > > Am Mittwoch 16 Dezember 2009 19:41:48 schrieb Jerome Glisse:
> > > > On Wed, Dec 16, 2009 at 03:58:30PM +0100, Johannes Hirte wrote:
> > > > > Am Mittwoch 16 Dezember 2009 08:14:43 schrieb Borislav Petkov:
> > > > > > On Tue, Dec 15, 2009 at 11:00:46PM +0100, Johannes Hirte wrote:
> > > > > > > This patch (as the BIOS option) will only disable the error
> > > > > > > reports. The error itself will still occur, right? So necessary
> > > > > > > to find out why the radeon driver trigger this error.
> > > > > >
> > > > > > Because the graphics driver does aperture accesses with no
> > > > > > matching GART translation, and the hw generates mchecks for
> > > > > > that. The whole story on GART table walk errors is in section
> > > > > > "13.10.1 GART Table Walk Error Reporting" in the document here:
> > > > > > http://support.amd.com/us/Processor_TechDocs/32559.pdf
> > > > > >
> > > > > > I can't say for sure about your BIOS, but if it is done as
> > > > > > described in the abovementioned section, the BIOS option should
> > > > > > disable logging of the error, which implies reporting too.
> > > > > >
> > > > > > The patch is still needed for machines that do not have that BIOS
> > > > > > option.
> > > > >
> > > > > Disabling in BIOS doesn't made any difference. The errors were
> > > > > still reported. Your patch disabled it. But I think this will make
> > > > > work harder for driver developers as they won't get this error
> > > > > anymore. Could this be made changeable on runtime/boottime?
> > > > >
> > > > > I've added drm people to CC as they're responsible for this error.
> > > > >
> > > > >
> > > > > regards,
> > > > >   Johannes
> > > >
> > > > More context would be usefull. Are you using KMS ? If so is your
> > > > userspace KMS capable ? Does this GART error happen all the time or
> > > > only after sometimes or when doing somethings specific ?
> > >
> > > Yes I'm using KMS when this error occours.
> > > Hardware:
> > > - Tyan Tiger K8W S8875 (AMD8151 Northbridge)
> > > - Radeon HD3650 AGP (RV635)
> > >
> > > Software:
> > > - linux-2.6.32
> > > - libdrm-2.4.16
> > > - mesa-7.7_rc2
> > > - xf86-video-ati-9999 (latest git everytime)
> > > - KDE-4.3.4 with compositing enabled (OpenGL)
> > >
> > > The errors occours after a while of normal desktop work. I haven't
> > > tested without KMS or compisiting. Will do this as well.
> >
> > It's KMS related but not to compositing. Without KMS the errors don't
> > occur. I found at least two log entries where the error occurred on
> > initializing KMS. It happens reliable after a while working with X.
> >
> > regards,
> >   Johannes
> 
> Can you give me the full reference of your motherboard ?
> 
> Cheers,
> Jerome
> 

Hm, it seems to be fixed somewhere whithin 2.6.33. I was working with
2.6.33-rc1-00225-gc9f937e more than a day without any errors or screen 
corruptions, where as with 2.6.32 this happens usually within minutes after 
login on X. Haven't bisected yet, but will do so.

regards,
  Johannes
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