diff options
| author | Jon Mason <jdmason@us.ibm.com> | 2006-06-26 13:58:05 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 19:48:18 +0200 |
| commit | 8d4f6b93a4aaa6b56b600cd1165c971f4395e4b3 (patch) | |
| tree | 23955634ded577e53c46390714a6f069b4587c86 /arch | |
| parent | [PATCH] x86_64: Change assembly to use regular cpuid_count macro (diff) | |
| download | linux-8d4f6b93a4aaa6b56b600cd1165c971f4395e4b3.tar.xz linux-8d4f6b93a4aaa6b56b600cd1165c971f4395e4b3.zip | |
[PATCH] x86_64: Calgary IOMMU - introduce iommu_detected
swiotlb relies on the gart specific iommu_aperture variable to know if
we discovered a hardware IOMMU before swiotlb initialization. Introduce
iommu_detected to do the same thing, but in a HW IOMMU neutral manner,
in preparation for adding the Calgary HW IOMMU.
Signed-Off-By: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-Off-By: Jon Mason <jdmason@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -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 |
4 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/aperture.c b/arch/x86_64/kernel/aperture.c index 9ea723bab16c..a195ef06ec55 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 33926c367250..7edd1a40fab3 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 82a346e6e2e4..4f67957d2b42 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 990ed67896f2..ebdb77fe2057 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) { |