From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753621Ab1DNVet (ORCPT ); Thu, 14 Apr 2011 17:34:49 -0400 Received: from mail-iw0-f174.google.com ([209.85.214.174]:57015 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752722Ab1DNVeq convert rfc822-to-8bit (ORCPT ); Thu, 14 Apr 2011 17:34:46 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=Byquhq8zomYSC5hwaOvasydJpiN0gkAZCZIdU6r8c3A40g03f1MwcNqP9DY+lkz5uD U5lEEEeY0FDJAfFY0i9AtymP564LWVkqSYjVWIOirG4fAprLCUrJO4agcPibR5S0ix/0 FfXxEVUO8AT0d6bzs+ZCuvP5p5ZGmS+QFpCLw= MIME-Version: 1.0 In-Reply-To: <20110414210932.GG18463@8bytes.org> References: <20110412090207.GE19819@8bytes.org> <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> Date: Thu, 14 Apr 2011 17:34:46 -0400 Message-ID: Subject: Re: Linux 2.6.39-rc3 From: Alex Deucher To: Joerg Roedel Cc: "H. Peter Anvin" , Yinghai Lu , Ingo Molnar , Linus Torvalds , Linux Kernel Mailing List , dri-devel@lists.freedesktop.org, Thomas Gleixner , Tejun Heo Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 14, 2011 at 5:09 PM, 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. I know what it's for. In the IGP graphics chip is also part of the north bridge, but it may not be related at all. > > 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. I havn't tested with an hd5000 > yet. The failing notebook has an hd4200 mobility. What exact model is the hd3000? Is it IGP GPU or a discrete GPU? It it's an IGP, it's identical to the hd4200 programming-wise. > > Btw. what happens if the gpu accesses an unmapped address in the gtt > range? It's redirected to a dummy page. Alex