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| author | Andi Kleen <ak@suse.de> | 2005-09-12 16:49:24 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-12 17:49:56 (GMT) |
| commit | 6142891a0c0209c91aa4a98f725de0d6e2ed4918 (patch) | |
| tree | 42bea8f8c19aeec3a2b5d518f09b7902fe6bf6d1 | |
| parent | 357e11d4cbbbb959a88a9bdbbf33a10f160b0823 (diff) | |
| download | linux-6142891a0c0209c91aa4a98f725de0d6e2ed4918.tar.xz | |
[PATCH] x86-64: Avoid unnecessary double bouncing for swiotlb
PCI_DMA_BUS_IS_PHYS has to be zero even when the GART IOMMU is disabled
and the swiotlb is used. Otherwise the block layer does unnecessary
double bouncing.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | include/asm-x86_64/pci.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/asm-x86_64/pci.h b/include/asm-x86_64/pci.h index eeb3088..5a82a67 100644 --- a/include/asm-x86_64/pci.h +++ b/include/asm-x86_64/pci.h @@ -50,10 +50,10 @@ extern int iommu_setup(char *opt); * address space. The networking and block device layers use * this boolean for bounce buffer decisions * - * On AMD64 it mostly equals, but we set it to zero to tell some subsystems - * that an IOMMU is available. + * On x86-64 it mostly equals, but we set it to zero to tell some subsystems + * that an hard or soft IOMMU is available. */ -#define PCI_DMA_BUS_IS_PHYS (no_iommu ? 1 : 0) +#define PCI_DMA_BUS_IS_PHYS 0 /* * x86-64 always supports DAC, but sometimes it is useful to force |