diff options
| -rw-r--r-- | arch/x86_64/kernel/aperture.c | 1 | ||||
| -rw-r--r-- | arch/x86_64/kernel/pci-dma.c | 3 | ||||
| -rw-r--r-- | arch/x86_64/kernel/pci-gart.c | 4 | ||||
| -rw-r--r-- | arch/x86_64/kernel/pci-swiotlb.c | 2 | ||||
| -rw-r--r-- | include/asm-x86_64/proto.h | 1 |
5 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/aperture.c b/arch/x86_64/kernel/aperture.c index 9ea723bab16..a195ef06ec5 100644 --- a/arch/x86_64/kernel/aperture.c +++ b/arch/x86_64/kernel/aperture.c @@ -209,6 +209,7 @@ void __init iommu_hole_init(void) if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00))) continue; + iommu_detected = 1; iommu_aperture = 1; aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7; diff --git a/arch/x86_64/kernel/pci-dma.c b/arch/x86_64/kernel/pci-dma.c index 33926c36725..7edd1a40fab 100644 --- a/arch/x86_64/kernel/pci-dma.c +++ b/arch/x86_64/kernel/pci-dma.c @@ -33,6 +33,9 @@ int panic_on_overflow __read_mostly = 0; int force_iommu __read_mostly= 0; #endif +/* Set this to 1 if there is a HW IOMMU in the system */ +int iommu_detected __read_mostly = 0; + /* Dummy device used for NULL arguments (normally ISA). Better would be probably a smaller DMA mask, but this is bug-to-bug compatible to i386. */ diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c index 82a346e6e2e..4f67957d2b4 100644 --- a/arch/x86_64/kernel/pci-gart.c +++ b/arch/x86_64/kernel/pci-gart.c @@ -597,6 +597,10 @@ static int __init pci_iommu_init(void) if (swiotlb) return -ENODEV; + /* Did we detect a different HW IOMMU? */ + if (iommu_detected && !iommu_aperture) + return -1; + if (no_iommu || (!force_iommu && end_pfn <= MAX_DMA32_PFN) || !iommu_aperture || diff --git a/arch/x86_64/kernel/pci-swiotlb.c b/arch/x86_64/kernel/pci-swiotlb.c index 990ed67896f..ebdb77fe205 100644 --- a/arch/x86_64/kernel/pci-swiotlb.c +++ b/arch/x86_64/kernel/pci-swiotlb.c @@ -31,7 +31,7 @@ struct dma_mapping_ops swiotlb_dma_ops = { void pci_swiotlb_init(void) { /* don't initialize swiotlb if iommu=off (no_iommu=1) */ - if (!iommu_aperture && !no_iommu && + if (!iommu_detected && !no_iommu && (end_pfn > MAX_DMA32_PFN || force_iommu)) swiotlb = 1; if (swiotlb) { diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h index 105476ff803..9d3335b4e9b 100644 --- a/include/asm-x86_64/proto.h +++ b/include/asm-x86_64/proto.h @@ -116,6 +116,7 @@ extern int skip_ioapic_setup; extern int acpi_ht; extern int acpi_disabled; +extern int iommu_detected; #ifdef CONFIG_IOMMU extern int fallback_aper_order; extern int fallback_aper_force; |