Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758593AbXEWXPX (ORCPT ); Wed, 23 May 2007 19:15:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756108AbXEWXPL (ORCPT ); Wed, 23 May 2007 19:15:11 -0400 Received: from main.gmane.org ([80.91.229.2]:53607 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755709AbXEWXPJ (ORCPT ); Wed, 23 May 2007 19:15:09 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Stephen Hemminger Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources Date: Wed, 23 May 2007 16:07:15 -0700 Organization: Linux Foundation Message-ID: <20070523160715.566635eb@freepuppy> References: <4635510D.4060103@shaw.ca> <200705231349.56976.jbarnes@virtuousgeek.org> <200705231403.24439.jbarnes@virtuousgeek.org> <4654AD91.1030808@pobox.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 069-064-229-129.pdx.net In-Reply-To: <4654AD91.1030808@pobox.com> X-Newsreader: Sylpheed-Claws 2.6.0 (GTK+ 2.10.11; x86_64-pc-linux-gnu) X-Face: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1543 Lines: 34 On Wed, 23 May 2007 17:09:37 -0400 Jeff Garzik wrote: > Jesse Barnes wrote: > > Apparently Vista will move away from using type 1 config space accesses > > though, so if we keep using it, we'll probably run into some lame board > > Yep. > > > > that assumes you're using mmconfig at some point in the near future. > > But then again, we're often on that less tested path (e.g. with ACPI), > > so maybe that doesn't matter much. > > One of the reasons why hardware vendors want to move away from > traditional accesses is to be able to use the larger config space in > PCI-Express, rather than being locked into the 256-byte legacy PCI > config space. > > Several modern PCI-Express devices utilize the upper config space, but > due to legacy reasons the registers are usually ones that do not require > OS drivers to know about (like BIST stuff or diagnostic registers). > > Expect that to change, as MS shakes out the bugs (or maybe we are doing > their job for them?). > On some PCI-Express boards, if you don't clear the advanced error reporting registers on boot up, they will cause IRQ storm. The AER registers are above 256 boundary. In fact, the AER support in Linux should depend on MMCONFIG. -- Stephen Hemminger - 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/