Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764747AbXINP3S (ORCPT ); Fri, 14 Sep 2007 11:29:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753923AbXINP3K (ORCPT ); Fri, 14 Sep 2007 11:29:10 -0400 Received: from jurassic.park.msu.ru ([195.208.223.243]:53354 "EHLO jurassic.park.msu.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753193AbXINP3J (ORCPT ); Fri, 14 Sep 2007 11:29:09 -0400 Date: Fri, 14 Sep 2007 19:29:13 +0400 From: Ivan Kokshaysky To: Robert Hancock Cc: Greg KH , Matthew Wilcox , Shaohua Li , lkml , linux-pci , Andrew Morton , Jesse Barnes Subject: Re: [PATCH]PCI:disable resource decode in PCI BAR detection Message-ID: <20070914192913.A6668@jurassic.park.msu.ru> References: <46EA00DA.6010704@shaw.ca> <20070914151401.A5586@jurassic.park.msu.ru> <46EA9B23.7030709@shaw.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <46EA9B23.7030709@shaw.ca>; from hancockr@shaw.ca on Fri, Sep 14, 2007 at 08:30:59AM -0600 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1313 Lines: 30 On Fri, Sep 14, 2007 at 08:30:59AM -0600, Robert Hancock wrote: > Do you have an example of specific hardware that exhibits this problem? Well, first two results of google search for "disable bar when sizing": http://lkml.org/lkml/2002/12/21/95 http://lkml.org/lkml/2002/12/20/110 > So far after a similar patch has been in -mm for months there have been > no reports of any such problems. You cannot compare user base of -mm and release kernels. Also, note that we're talking about maybe 0.01% of systems running Linux. And similar patch appeared in various trees several times over the last decade and every time it had to be reverted. > This isn't guaranteed to help. I don't think it is only integrated > graphics that could cause this problem, I think that an add-on PCI > Express card can do this as well. Depending on the chipset memory decode > rules, any PCI or PCI Express device with a BAR large enough could cause > issues. No, it's impossible for several reasons. Most obvious one is that a PCI-E bridge does isolate stuff quite nicely. Ivan. - 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/