diff options
| -rw-r--r-- | arch/x86/include/asm/irq_remapping.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/early-quirks.c | 20 | ||||
| -rw-r--r-- | drivers/iommu/intel_irq_remapping.c | 10 | ||||
| -rw-r--r-- | drivers/iommu/irq_remapping.c | 6 | ||||
| -rw-r--r-- | drivers/iommu/irq_remapping.h | 2 |
5 files changed, 40 insertions, 0 deletions
diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h index 95fd3527f632..aca6aa2088b2 100644 --- a/arch/x86/include/asm/irq_remapping.h +++ b/arch/x86/include/asm/irq_remapping.h @@ -28,6 +28,7 @@ extern void setup_irq_remapping_ops(void); extern int irq_remapping_supported(void); +extern void set_irq_remapping_broken(void); extern int irq_remapping_prepare(void); extern int irq_remapping_enable(void); extern void irq_remapping_disable(void); @@ -54,6 +55,7 @@ void irq_remap_modify_chip_defaults(struct irq_chip *chip); static inline void setup_irq_remapping_ops(void) { } static inline int irq_remapping_supported(void) { return 0; } +static inline void set_irq_remapping_broken(void) { } static inline int irq_remapping_prepare(void) { return -ENODEV; } static inline int irq_remapping_enable(void) { return -ENODEV; } static inline void irq_remapping_disable(void) { } 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) } #endif +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 #define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED) @@ -221,6 +237,10 @@ static struct chipset early_qrk[] __initdata = { PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs }, { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd }, + { PCI_VENDOR_ID_INTEL, 0x3403, PCI_CLASS_BRIDGE_HOST, + PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check }, + { PCI_VENDOR_ID_INTEL, 0x3406, PCI_CLASS_BRIDGE_HOST, + PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check }, {} }; diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index f3b8f23b5d8f..5b19b2d6ec2d 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -524,6 +524,16 @@ static int __init intel_irq_remapping_supported(void) if (disable_irq_remap) return 0; + if (irq_remap_broken) { + WARN_TAINT(1, TAINT_FIRMWARE_WORKAROUND, + "This system BIOS has enabled interrupt remapping\n" + "on a chipset that contains an erratum making that\n" + "feature unstable. To maintain system stability\n" + "interrupt remapping is being disabled. Please\n" + "contact your BIOS vendor for an update\n"); + disable_irq_remap = 1; + return 0; + } if (!dmar_ir_support()) return 0; diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c index d56f8c17c5fe..3c11043bdee5 100644 --- a/drivers/iommu/irq_remapping.c +++ b/drivers/iommu/irq_remapping.c @@ -19,6 +19,7 @@ int irq_remapping_enabled; int disable_irq_remap; +int irq_remap_broken; int disable_sourceid_checking; int no_x2apic_optout; @@ -211,6 +212,11 @@ void __init setup_irq_remapping_ops(void) #endif } +void set_irq_remapping_broken(void) +{ + irq_remap_broken = 1; +} + int irq_remapping_supported(void) { if (disable_irq_remap) diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h index ecb637670405..90c4dae5a46b 100644 --- a/drivers/iommu/irq_remapping.h +++ b/drivers/iommu/irq_remapping.h @@ -32,6 +32,7 @@ struct pci_dev; struct msi_msg; extern int disable_irq_remap; +extern int irq_remap_broken; extern int disable_sourceid_checking; extern int no_x2apic_optout; extern int irq_remapping_enabled; @@ -89,6 +90,7 @@ extern struct irq_remap_ops amd_iommu_irq_ops; #define irq_remapping_enabled 0 #define disable_irq_remap 1 +#define irq_remap_broken 0 #endif /* CONFIG_IRQ_REMAP */ |