From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756048AbZCBVob (ORCPT ); Mon, 2 Mar 2009 16:44:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752254AbZCBVoW (ORCPT ); Mon, 2 Mar 2009 16:44:22 -0500 Received: from mga11.intel.com ([192.55.52.93]:23738 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751362AbZCBVoV (ORCPT ); Mon, 2 Mar 2009 16:44:21 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.38,291,1233561600"; d="scan'208";a="435497553" Subject: Re: [TIP,regression,i915] /dev/dri/card0 is no longer present From: "Pallipadi, Venkatesh" To: Ingo Molnar Cc: Sitsofe Wheeler , "dri-devel@lists.sourceforge.net" , LKML , "Siddha, Suresh B" , Jesse Barnes In-Reply-To: <20090302213412.GB25076@elte.hu> References: <20090301110455.GA18547@silver.sucs.org> <20090301113948.GA3602@elte.hu> <20090301134809.GA4753@silver.sucs.org> <1236020758.4586.76.camel@localhost.localdomain> <20090302213412.GB25076@elte.hu> Content-Type: text/plain Date: Mon, 02 Mar 2009 13:43:55 -0800 Message-Id: <1236030235.4586.79.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.24.3 (2.24.3-1.fc10) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2009-03-02 at 13:34 -0800, Ingo Molnar wrote: > * Pallipadi, Venkatesh wrote: > > > On Sun, 2009-03-01 at 05:48 -0800, Sitsofe Wheeler wrote: > > > On Sun, Mar 01, 2009 at 12:39:48PM +0100, Ingo Molnar wrote: > > > > > > > > Thanks, i've reverted the commit for now. Could you please send > > > > a 'dmesg' from the bootup with the failed driver? By all > > > > likelyhood an ioremap failure causes a driver failure. > > > > > > > > > > See below (drm says it initalized though...): > > > > > > [ 0.000000] Linux version 2.6.29-rc6-00006-g17581ad (@verona) (gcc version 4.2.4) #87 Sun Mar 1 13:42:28 GMT 2009 > > > [ 0.000000] KERNEL supported cpus: > > > [ 0.000000] Intel GenuineIntel > > > [ 0.000000] PAT WC disabled due to known CPU erratum. > > > > Looks like PAT is getting disabled on this platform. Can you > > send the output of /proc/cpuinfo please. > > Does this mean we failed an ioremap()? We still should not fail > a device ioremap _ever_. We should just fall back to UC and be > done with it. We may emit a warning if we consider it > troublesome, but we should never ever break working drivers > really. > No. We don't break ioremap. We try to fallback on UC_MINUS here. But, there is something wrong happening in that path, that is resulting in this issue. I am looking at that right now. I have found another problem with this particular patch, on one of test systems. So, let us keep the revert until I fix what looks like two different problems here. Thanks, Venki