path: root/arch/x86/kernel/early-quirks.c
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authorNeil Horman <nhorman@tuxdriver.com>2013-04-16 16:38:32 -0400
committerJoerg Roedel <joro@8bytes.org>2013-04-18 17:00:47 +0200
commit03bbcb2e7e292838bb0244f5a7816d194c911d62 (patch)
treee12aaa5de8ba8f7168e4112604e3f2afc6453154 /arch/x86/kernel/early-quirks.c
parentbd5cdad0c8e0f0adcd6e9c582abe4c4233c19b03 (diff)
iommu/vt-d: add quirk for broken interrupt remapping on 55XX chipsets
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 ] Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: Prarit Bhargava <prarit@redhat.com> CC: Don Zickus <dzickus@redhat.com> CC: Don Dutile <ddutile@redhat.com> CC: Bjorn Helgaas <bhelgaas@google.com> CC: Asit Mallick <asit.k.mallick@intel.com> CC: David Woodhouse <dwmw2@infradead.org> CC: linux-pci@vger.kernel.org CC: Joerg Roedel <joro@8bytes.org> CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> CC: Arkadiusz Miƛkiewicz <arekm@maven.pl> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'arch/x86/kernel/early-quirks.c')
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index 3755ef494390..94ab6b90dd3f 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -18,6 +18,7 @@
#include <asm/apic.h>
#include <asm/iommu.h>
#include <asm/gart.h>
+#include <asm/irq_remapping.h>
static void __init fix_hypertransport_config(int num, int slot, int func)
@@ -192,6 +193,21 @@ static void __init ati_bugs_contd(int num, int slot, int func)
+static void __init intel_remapping_check(int num, int slot, int func)
+ u8 revision;
+ revision = read_pci_config_byte(num, slot, func, PCI_REVISION_ID);
+ /*
+ * Revision 0x13 of this chipset supports irq remapping
+ * but has an erratum that breaks its behavior, flag it as such
+ */
+ if (revision == 0x13)
+ set_irq_remapping_broken();
#define QFLAG_APPLY_ONCE 0x1
#define QFLAG_APPLIED 0x2
@@ -221,6 +237,10 @@ static struct chipset early_qrk[] __initdata = {
PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
+ PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
+ PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },

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