Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754327Ab1DOGuT (ORCPT ); Fri, 15 Apr 2011 02:50:19 -0400 Received: from 8bytes.org ([88.198.83.132]:40224 "EHLO 8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752774Ab1DOGuT (ORCPT ); Fri, 15 Apr 2011 02:50:19 -0400 Date: Fri, 15 Apr 2011 08:50:17 +0200 From: Joerg Roedel To: Alex Deucher Cc: "H. Peter Anvin" , Yinghai Lu , Ingo Molnar , Linus Torvalds , Linux Kernel Mailing List , dri-devel@lists.freedesktop.org, Thomas Gleixner , Tejun Heo Subject: Re: Linux 2.6.39-rc3 Message-ID: <20110415065017.GH18463@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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 Content-Length: 1488 Lines: 41 On Thu, Apr 14, 2011 at 05:34:46PM -0400, Alex Deucher wrote: > On Thu, Apr 14, 2011 at 5:09 PM, Joerg Roedel wrote: > > 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. Okay, just wanted to make clear that it is part of the CPU and not of the chipset :) > > 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. It is an IGP card, an "ATI Technologies Inc RS780M/RS780MN [Radeon HD 3200 Graphics]" according to lspci. > > Btw. what happens if the gpu accesses an unmapped address in the gtt > > range? > > It's redirected to a dummy page. So there should be no issue too, this is a very weird bug. Joerg -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/