linux-kernel - Re: Linux 2.6.39-rc3

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Message-ID: <20110415085526.GI18463@8bytes.org>
Date:	Fri, 15 Apr 2011 10:55:26 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Michel Dänzer <michel@...nzer.net>
Cc:	Alex Deucher <alexdeucher@...il.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, "H. Peter Anvin" <hpa@...or.com>,
	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Linux 2.6.39-rc3

On Fri, Apr 15, 2011 at 10:26:34AM +0200, Michel Dänzer wrote:
> On Don, 2011-04-14 at 23:09 +0200, Joerg Roedel wrote: 
> > On Thu, Apr 14, 2011 at 10:28:43AM -0400, Alex Deucher wrote:
> > > On Thu, Apr 14, 2011 at 4:56 AM, Joerg Roedel <joro@...tes.org> wrote:
> > > > And this makes a difference, with this change on-top of -rc3 the box boots
> > > > fine. So there seems to be some dependency between the GART base and the GTT
> > > > base even when they are in different address spaces.
> > > >
> > > > Alex, can you comment on this?
> > > 
> > > As Dave said, they are completely different addresses spaces.  You
> > > could put the GPU aperture at 0 if you wanted (in fact we do on some
> > > chips).  Perhaps there's some strange interaction with the nb gart
> > > since the nb gart on that chipset was designed to be used for graphics
> > > and the rs780/880 can be configured to use an agp aperture.
> > > Unfortunately, I'm not that familiar with the nb gart.
> > 
> > Actually, the nb gart is part of the cpu. It is part of the cpu north
> > bridge and can translate io and cpu accesses. In fact, it is a remapper
> > of physical memory addresses.
> > 
> > The problem seems to be related to specific gpu chips. On another
> > notebook with an hd3000 card gtt and the nb gart aperture are both on
> > 0xa0000000 too but the box works fine.
> 
> Wasn't the working theory that the problem occurs if those two values
> aren't the same?

Yes it is, but this doesn't seem to be problematic on all readeon GPU
chips.

	Joerg

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