Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946647AbWKJN5c (ORCPT ); Fri, 10 Nov 2006 08:57:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946656AbWKJN5c (ORCPT ); Fri, 10 Nov 2006 08:57:32 -0500 Received: from srv5.dvmed.net ([207.36.208.214]:7296 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1946647AbWKJN5b (ORCPT ); Fri, 10 Nov 2006 08:57:31 -0500 Message-ID: <455484F0.3000506@garzik.org> Date: Fri, 10 Nov 2006 08:56:00 -0500 From: Jeff Garzik User-Agent: Thunderbird 1.5.0.7 (X11/20061027) MIME-Version: 1.0 To: Linus Torvalds CC: Adrian Bunk , Jeff Chua , Matthew Wilcox , Andi Kleen , Aaron Durbin , Andrew Morton , Linux Kernel Mailing List , gregkh@suse.de, linux-pci@atrey.karlin.mff.cuni.cz Subject: Re: [discuss] Re: 2.6.19-rc4: known unfixed regressions (v3) References: <20061107171143.GU27140@parisc-linux.org> <200611080839.46670.ak@suse.de> <20061108122237.GF27140@parisc-linux.org> <20061108172650.GC4729@stusta.de> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.3 (----) X-Spam-Report: SpamAssassin version 3.1.7 on srv5.dvmed.net summary: Content analysis details: (-4.3 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1213 Lines: 28 Linus Torvalds wrote: > We really should stop using MMCONFIG entirely, until we have a > per-southbridge true knowledge of what the real decoding is. The BIOS > tables for this are simply too damn unreliable. FWIW: MMCONFIG is required for PCI domain support (or "PCI segments" as ACPI calls them). Only a few mass market OEM boxes exist that need this -- and they are all pretty new (Opteron multi-core) -- but more are coming. I have a patch in -mm that works for this. Without the patch, my sata_mv card and the machine's built-in MPT-Fusion do not appear at all in PCI bus scans (nor do the associated hard drives) on this production HP box. So far these machines are rare, /usually/ with a BIOS switch to turn off PCI domains. This says nothing about BIOS table reliability, of course. I agree that MMCONFIG probing is highly unreliable at present. Whitelisting "<2007" systems like Andi proposed may be the only option in some cases. Jeff - 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/