Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967484Ab3DRPCq (ORCPT ); Thu, 18 Apr 2013 11:02:46 -0400 Received: from 8bytes.org ([85.214.48.195]:49016 "EHLO mail.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966367Ab3DRPCo (ORCPT ); Thu, 18 Apr 2013 11:02:44 -0400 Date: Thu, 18 Apr 2013 17:02:39 +0200 From: Joerg Roedel To: Neil Horman Cc: linux-kernel@vger.kernel.org, Prarit Bhargava , Don Zickus , Don Dutile , Bjorn Helgaas , Asit Mallick , David Woodhouse , linux-pci@vger.kernel.org, Konrad Rzeszutek Wilk , Arkadiusz =?utf-8?Q?Mi=C5=9Bkiewicz?= Subject: Re: [PATCH v10] irq: add quirk for broken interrupt remapping on 55XX chipsets Message-ID: <20130418150222.GB2558@8bytes.org> References: <1362158276-4901-1-git-send-email-nhorman@tuxdriver.com> <1366144712-23460-1-git-send-email-nhorman@tuxdriver.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1366144712-23460-1-git-send-email-nhorman@tuxdriver.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-DSPAM-Result: Whitelisted X-DSPAM-Processed: Thu Apr 18 17:02:42 2013 X-DSPAM-Confidence: 0.9996 X-DSPAM-Probability: 0.0000 X-DSPAM-Signature: 51700b1223678514019764 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2097 Lines: 41 On Tue, Apr 16, 2013 at 04:38:32PM -0400, Neil Horman wrote: > A few years back intel published a spec update: > http://www.intel.com/content/dam/doc/specification-update/5520-and-5500-chipset-ioh-specification-update.pdf > > For the 5520 and 5500 chipsets which contained an errata (specificially errata > 53), which noted that these chipsets can't properly do interrupt remapping, and > as a result the recommend that interrupt remapping be disabled in bios. While > many vendors have a bios update to do exactly that, not all do, and of course > not all users update their bios to a level that corrects the problem. As a > result, occasionally interrupts can arrive at a cpu even after affinity for that > interrupt has be moved, leading to lost or spurrious interrupts (usually > characterized by the message: > kernel: do_IRQ: 7.71 No irq handler for vector (irq -1) > > There have been several incidents recently of people seeing this error, and > investigation has shown that they have system for which their BIOS level is such > that this feature was not properly turned off. As such, it would be good to > give them a reminder that their systems are vulnurable to this problem. For > details of those that reported the problem, please see: > https://bugzilla.redhat.com/show_bug.cgi?id=887006 > > Signed-off-by: Neil Horman > CC: Prarit Bhargava > CC: Don Zickus > CC: Don Dutile > CC: Bjorn Helgaas > CC: Asit Mallick > CC: David Woodhouse > CC: linux-pci@vger.kernel.org > CC: Joerg Roedel > CC: Konrad Rzeszutek Wilk > CC: Arkadiusz Miśkiewicz Applied with some small changes to my x86/vt-d branch, thanks Neil. -- 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/