Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764035AbXJRKih (ORCPT ); Thu, 18 Oct 2007 06:38:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761907AbXJRKiX (ORCPT ); Thu, 18 Oct 2007 06:38:23 -0400 Received: from outbound-fra.frontbridge.com ([62.209.45.174]:28274 "EHLO outbound1-fra-R.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758182AbXJRKiW convert rfc822-to-8bit (ORCPT ); Thu, 18 Oct 2007 06:38:22 -0400 X-BigFish: VP X-MS-Exchange-Organization-Antispam-Report: OrigIP: 139.95.251.8;Service: EHS X-Server-Uuid: 9D002D81-0D89-4A8A-BDDE-D174997CF0D6 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Subject: RE: [patch] PCI: disable MSI on more ATI NorthBridges Date: Thu, 18 Oct 2007 18:37:59 +0800 Message-ID: <5CAB7B5D6F8AB84AA868A46B47A507055D8C67@sshaexmb1.amd.com> In-Reply-To: <20071018.031957.104033396.davem@davemloft.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [patch] PCI: disable MSI on more ATI NorthBridges Thread-Index: AcgRcHotFPpVyrc3Tl6R26hf0ZqIQgAALaZw From: "Shane Huang" To: "David Miller" cc: gregkh@suse.de, htejun@gmail.com, linux-kernel@vger.kernel.org, linux-pci@atrey.karlin.mff.cuni.cz, "Su, Henry" , "Yang, Libin" , "Shane Huang" X-OriginalArrivalTime: 18 Oct 2007 10:38:03.0362 (UTC) FILETIME=[F624F420:01C81172] X-WSS-ID: 6B09E8070602261184-01-01 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2174 Lines: 63 Hi Miller: Thank you for your response. The reason why MSIs of these northbridges do not work is still under further debug, we are NOT able to tell its hardware issue or software issue at this time. But enablement of them will lead to the OS installation failure in many distributions like openSUSE, Ubuntu etc: https://bugzilla.novell.com/show_bug.cgi?id=302016 So we have to disable them firstly before we find out the root cause, maybe they are just workarounds. If you guys know much more about this MSI problem, don't hesitate to tell us, we can debug on some of the hardware platforms. BTW, There already some disablements to some ATI NB MSIs in the kernel, the reasons are similar. Thanks Shane > -----Original Message----- > From: David Miller [mailto:davem@davemloft.net] > Sent: Thursday, October 18, 2007 6:20 PM > To: Shane Huang > Cc: gregkh@suse.de; htejun@gmail.com; linux-kernel@vger.kernel.org; linux-pci@atrey.karlin.mff.cuni.cz; Su, Henry; Yang, Libin > Subject: Re: [patch] PCI: disable MSI on more ATI NorthBridges > > From: "Shane Huang" > Date: Thu, 18 Oct 2007 17:14:36 +0800 > > > More ATI North Bridges like RS780 can't do MSI like its predecessors > > in linux. Disable MSIs on them. > > > > Signed-off-by: Shane Huang > > Can we get some detail as to why these north bridges have to have MSI > disabled completely? I can't believe that all 6 of these ATI > controllers which will now be listed in the quirk table cannot use MSI > at all. > > I've discovered several cases where it was a buggy device or a driver > bug that caused someone to erroneously submit patches that disable MSI > completely for the bridge they were behind. > > I don't want that to happen any more. One way to prevent that is to > have a full detailed justification for the MSI disabling in the > changelog or in the comments for the MSI quirk. > > Thank you. > - 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/