Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758669Ab3CDTEp (ORCPT ); Mon, 4 Mar 2013 14:04:45 -0500 Received: from charlotte.tuxdriver.com ([70.61.120.58]:33654 "EHLO smtp.tuxdriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758166Ab3CDTEn (ORCPT ); Mon, 4 Mar 2013 14:04:43 -0500 From: Neil Horman To: linux-kernel@vger.kernel.org Cc: Neil Horman , Prarit Bhargava , Don Zickus , Don Dutile , Bjorn Helgaas , Asit Mallick , linux-pci@vger.kernel.org Subject: [PATCH v2] irq: add quirk for broken interrupt remapping on 55XX chipsets Date: Mon, 4 Mar 2013 14:04:19 -0500 Message-Id: <1362423859-18516-1-git-send-email-nhorman@tuxdriver.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1362158276-4901-1-git-send-email-nhorman@tuxdriver.com> References: <1362158276-4901-1-git-send-email-nhorman@tuxdriver.com> X-Spam-Score: -2.9 (--) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4529 Lines: 105 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. Signed-off-by: Neil Horman CC: Prarit Bhargava CC: Don Zickus CC: Don Dutile CC: Bjorn Helgaas CC: Asit Mallick CC: linux-pci@vger.kernel.org --- Change notes: v2) * Moved the quirk to the x86 arch, since consensus seems to be that the 55XX chipset series is x86 only. I decided however to keep the quirk as a regular quirk, not an early_quirk. Early quirks have no way currently to determine if BIOS has properly disabled the feature in the iommu, at least not without significant hacking, and since its quite possible this will be a short lived quirk, should Don Z's workaround code prove successful (and it looks like it may well), I don't think that necessecary. * Removed the WARNING banner from the quirk, and added the HW_ERR token to the string, I opted to leave the newlines in place however, as I really couldnt find a way to keep the text on a single line is still legible from a code perspective. I think theres enough language in there that using cscope on just about any substring however will turn it up, and again, this may be a short lived quirk. --- arch/x86/kernel/quirks.c | 18 ++++++++++++++++++ include/linux/pci_ids.h | 2 ++ 2 files changed, 20 insertions(+) diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c index 26ee48a..a718ea2 100644 --- a/arch/x86/kernel/quirks.c +++ b/arch/x86/kernel/quirks.c @@ -5,6 +5,7 @@ #include #include +#include "../../../drivers/iommu/irq_remapping.h" #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI) @@ -567,3 +568,20 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F5, quirk_amd_nb_node); #endif + +static void intel_remapping_check(struct pci_dev *dev) +{ + u8 revision; + + pci_read_config_byte(dev, PCI_REVISION_ID, &revision); + + if ((revision == 0x13) && irq_remapping_enabled) { + pr_warn(HW_ERR "This system BIOS has enabled interrupt remapping\n" + "on a chipset that contains an errata making that\n" + "feature unstable. Please reboot with nointremap\n" + "added to the kernel command line and contact\n" + "your BIOS vendor for an update"); + } +} +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5520_IOHUB, intel_remapping_check); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5500_IOHUB, intel_remapping_check); diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index 31717bd..54027a6 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h @@ -2732,6 +2732,8 @@ #define PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_RANK_REV2 0x2db2 #define PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_TC_REV2 0x2db3 #define PCI_DEVICE_ID_INTEL_82855PM_HB 0x3340 +#define PCI_DEVICE_ID_INTEL_5500_IOHUB 0x3403 +#define PCI_DEVICE_ID_INTEL_5520_IOHUB 0x3406 #define PCI_DEVICE_ID_INTEL_IOAT_TBG4 0x3429 #define PCI_DEVICE_ID_INTEL_IOAT_TBG5 0x342a #define PCI_DEVICE_ID_INTEL_IOAT_TBG6 0x342b -- 1.7.11.7 -- 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/