Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752661Ab1DOQLa (ORCPT ); Fri, 15 Apr 2011 12:11:30 -0400 Received: from mail-iw0-f174.google.com ([209.85.214.174]:65095 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751404Ab1DOQL3 convert rfc822-to-8bit (ORCPT ); Fri, 15 Apr 2011 12:11:29 -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=XxGRa7L0D3tPHRxkCZxxXVR6+QnVZlSIJUtakAGaFCn3Wfd6OZomfkbAUphzCut8f5 Lzk5NS4FiEJU/6t31xGTuKNRBlFWH2W/l3grde3DEVPKP8xjqkbo4QvvDQlwNIxUGtE8 TbFPvaHaIgcMACLjzq4EEKU9iCkRd+7w1O/hI= MIME-Version: 1.0 In-Reply-To: <20110415154604.GN18463@8bytes.org> References: <20110413193459.GL19819@8bytes.org> <4DA60C30.4060606@kernel.org> <4DA6145D.9070703@kernel.org> <4DA655E7.3000904@zytor.com> <20110415131152.GJ18463@8bytes.org> <20110415131650.GB18660@elte.hu> <20110415154604.GN18463@8bytes.org> Date: Fri, 15 Apr 2011 12:11:28 -0400 Message-ID: Subject: Re: Linux 2.6.39-rc3 From: Jerome Glisse To: Joerg Roedel Cc: Ingo Molnar , Linus Torvalds , Linux Kernel Mailing List , "dri-devel@lists.freedesktop.org" , Tejun Heo , "H. Peter Anvin" , Thomas Gleixner , Yinghai Lu , alexandre.f.demers@gmail.com 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 Content-Length: 1354 Lines: 30 On Fri, Apr 15, 2011 at 11:46 AM, Joerg Roedel 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? > > Well, thinking again about this, the GPU likely generated this DMA > request before too (which has an address in the range configured for the > GTT on the card), but nobody noticed because they just hit main memory. > And with the allocation changes in 39-rc1 the GART aperture started to > be on the same address as the GTT (in their respective address spaces) > so that the DMA request hit the GART. This caused the MCE and the > sync-flood. > The open question is why the GPU generates a DMA request with an address > that is configured as the GTT base (+1 page) on the card. > > ? ? ? ?Joerg > Do you also got the write if you load radeon with radeon.no_wb=1 ? I think at this address it's the wb page, or maybe the cp as wb likely take only one page Cheers, Jerome -- 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/