linux-kernel - Re: Linux 2.6.39-rc3

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Message-ID: <BANLkTikd2nUO+Obn_Ez0HqjbE5KO3Yt6CQ@mail.gmail.com>
Date:	Fri, 15 Apr 2011 12:11:04 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, alexandre.f.demers@...il.com
Subject: Re: Linux 2.6.39-rc3

On Fri, Apr 15, 2011 at 10:33 AM, Joerg Roedel <joro@...tes.org> wrote:
> On Fri, Apr 15, 2011 at 03:16:50PM +0200, Ingo Molnar wrote:
>> Ok, but how did the allocation changes start triggering this error in
>> v2.6.39-rc1? There must still be some layout specific thing here, right?
>> Do we understand the details of that as well?
>
> No, I must admit that I lack enough knowledge about the GPU hardware to
> make an guess how this tanslation-request happened. All I can tell is
> the address that was reported in the MCE, it is 0xa0001000 (==the second
> page of the GART aperture).
>
> Maybe Alex can help here. Alex, may it be possible that the GPU
> generates DMA requests in the GTT area before the GTT is activated (or
> the activation is completed)? Or can you imagine any other reason?

It shouldn't.  The driver binds a dummy page to all entries in the
table at init time and whenever the actual pages are unbound.

Alex
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