diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/dmar.c | 10 | ||||
| -rw-r--r-- | drivers/pci/intr_remapping.c | 3 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c index fba4f6891680..270ed222a075 100644 --- a/drivers/pci/dmar.c +++ b/drivers/pci/dmar.c @@ -1316,3 +1316,13 @@ int dmar_reenable_qi(struct intel_iommu *iommu) return 0; } + +/* + * Check interrupt remapping support in DMAR table description. + */ +int dmar_ir_support(void) +{ + struct acpi_table_dmar *dmar; + dmar = (struct acpi_table_dmar *)dmar_tbl; + return dmar->flags & 0x1; +} diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c index ebfa47b79c5b..ac065144c01c 100644 --- a/drivers/pci/intr_remapping.c +++ b/drivers/pci/intr_remapping.c @@ -611,6 +611,9 @@ int __init intr_remapping_supported(void) if (disable_intremap) return 0; + if (!dmar_ir_support()) + return 0; + for_each_drhd_unit(drhd) { struct intel_iommu *iommu = drhd->iommu; |