From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753175Ab1DOIz2 (ORCPT ); Fri, 15 Apr 2011 04:55:28 -0400 Received: from 8bytes.org ([88.198.83.132]:50841 "EHLO 8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751974Ab1DOIz1 (ORCPT ); Fri, 15 Apr 2011 04:55:27 -0400 Date: Fri, 15 Apr 2011 10:55:26 +0200 From: Joerg Roedel To: Michel =?iso-8859-1?Q?D=E4nzer?= Cc: Alex Deucher , Yinghai Lu , Linux Kernel Mailing List , dri-devel@lists.freedesktop.org, "H. Peter Anvin" , Tejun Heo , Linus Torvalds , Thomas Gleixner Subject: Re: Linux 2.6.39-rc3 Message-ID: <20110415085526.GI18463@8bytes.org> References: <20110412184433.GF19819@8bytes.org> <20110413064609.GA18777@elte.hu> <20110413172147.GI19819@8bytes.org> <4DA5F62F.3030504@kernel.org> <4DA654D6.2060103@zytor.com> <20110414085624.GC18463@8bytes.org> <20110414210932.GG18463@8bytes.org> <1302855994.15520.158.camel@thor.local> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1302855994.15520.158.camel@thor.local> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 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