linux-kernel - Re: radeon KMS causes GART Table Walk Errors (was: K8 ECC error with linux-2.6.32)

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Date:	Fri, 18 Dec 2009 15:44:35 +0100
From:	Jerome Glisse <glisse@...edesktop.org>
To:	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>
Cc:	linux-kernel@...r.kernel.org, airlied@...ux.ie,
	dri-devel@...ts.sourceforge.net
Subject: Re: radeon KMS causes GART Table Walk Errors (was: K8 ECC error with
 linux-2.6.32)

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
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