diff options
Diffstat (limited to 'drivers/iommu/intel-iommu.c')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 17b4744..6a01735 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -497,13 +497,21 @@ static int dmar_forcedac; static int intel_iommu_strict; static int intel_iommu_superpage = 1; static int intel_iommu_ecs = 1; +static int intel_iommu_pasid28; +static int iommu_identity_mapping; + +#define IDENTMAP_ALL 1 +#define IDENTMAP_GFX 2 +#define IDENTMAP_AZALIA 4 /* We only actually use ECS when PASID support (on the new bit 40) * is also advertised. Some early implementations — the ones with * PASID support on bit 28 — have issues even when we *only* use * extended root/context tables. */ +#define pasid_enabled(iommu) (ecap_pasid(iommu->ecap) || \ + (intel_iommu_pasid28 && ecap_broken_pasid(iommu->ecap))) #define ecs_enabled(iommu) (intel_iommu_ecs && ecap_ecs(iommu->ecap) && \ - ecap_pasid(iommu->ecap)) + pasid_enabled(iommu)) int intel_iommu_gfx_mapped; EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped); @@ -566,6 +574,11 @@ static int __init intel_iommu_setup(char *str) printk(KERN_INFO "Intel-IOMMU: disable extended context table support\n"); intel_iommu_ecs = 0; + } else if (!strncmp(str, "pasid28", 7)) { + printk(KERN_INFO + "Intel-IOMMU: enable pre-production PASID support\n"); + intel_iommu_pasid28 = 1; + iommu_identity_mapping |= IDENTMAP_GFX; } str += strcspn(str, ","); @@ -2403,11 +2416,6 @@ found_domain: return domain; } -static int iommu_identity_mapping; -#define IDENTMAP_ALL 1 -#define IDENTMAP_GFX 2 -#define IDENTMAP_AZALIA 4 - static int iommu_domain_identity_map(struct dmar_domain *domain, unsigned long long start, unsigned long long end) |
