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authorJon Mason <jdmason@us.ibm.com>2006-06-26 13:58:05 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 10:48:18 -0700
commit8d4f6b93a4aaa6b56b600cd1165c971f4395e4b3 (patch)
tree23955634ded577e53c46390714a6f069b4587c86 /arch/x86_64/kernel/pci-dma.c
parent2bbc419f9d51b44f3fdeea12c5b786bdace82b8e (diff)
[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/x86_64/kernel/pci-dma.c')
-rw-r--r--arch/x86_64/kernel/pci-dma.c3
1 files changed, 3 insertions, 0 deletions
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. */