From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:36788 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933220Ab3GWRGD (ORCPT ); Tue, 23 Jul 2013 13:06:03 -0400 Date: Tue, 23 Jul 2013 10:06:02 -0700 From: Greg KH To: Neil Horman Cc: stable@vger.kernel.org, Prarit Bhargava , Don Zickus , Don Dutile , Bjorn Helgaas , Asit Mallick , David Woodhouse , linux-pci@vger.kernel.org, Joerg Roedel , Konrad Rzeszutek Wilk , Arkadiusz =?utf-8?Q?Mi=C5=9Bkiewicz?= , Jean Delvare Subject: Re: [stable PATCH] iommu/vt-d: add quirk for broken interrupt remapping on 55XX chipsets Message-ID: <20130723170602.GA15090@kroah.com> References: <20130708154111.GA27952@kroah.com> <1373303174-21977-1-git-send-email-nhorman@tuxdriver.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 In-Reply-To: <1373303174-21977-1-git-send-email-nhorman@tuxdriver.com> Sender: linux-pci-owner@vger.kernel.org List-ID: On Mon, Jul 08, 2013 at 01:06:14PM -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 > > [ Joerg: Removed CONFIG_IRQ_REMAP ifdef from early-quirks.c ] > > Notes: Modified early-quirks.c to include linux/irq.h, to fix warnings. This > isn't needed in the upstream tree > > 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 > CC: Jean Delvare > CC: Greg KH > Signed-off-by: Joerg Roedel > (cherry picked from commit 03bbcb2e7e292838bb0244f5a7816d194c911d62) As 3.9-stable is now dead, this one missed that window, sorry about that. greg k-h