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authorAndi Kleen <ak@suse.de>2005-09-12 12:49:24 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-12 13:49:56 -0400
commit6142891a0c0209c91aa4a98f725de0d6e2ed4918 (patch)
tree42bea8f8c19aeec3a2b5d518f09b7902fe6bf6d1 /include
parent357e11d4cbbbb959a88a9bdbbf33a10f160b0823 (diff)
[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>
Diffstat (limited to 'include')
-rw-r--r--include/asm-x86_64/pci.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/asm-x86_64/pci.h b/include/asm-x86_64/pci.h
index eeb3088a1c9e..5a82a6762c21 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);
50 * address space. The networking and block device layers use 50 * address space. The networking and block device layers use
51 * this boolean for bounce buffer decisions 51 * this boolean for bounce buffer decisions
52 * 52 *
53 * On AMD64 it mostly equals, but we set it to zero to tell some subsystems 53 * On x86-64 it mostly equals, but we set it to zero to tell some subsystems
54 * that an IOMMU is available. 54 * that an hard or soft IOMMU is available.
55 */ 55 */
56#define PCI_DMA_BUS_IS_PHYS (no_iommu ? 1 : 0) 56#define PCI_DMA_BUS_IS_PHYS 0
57 57
58/* 58/*
59 * x86-64 always supports DAC, but sometimes it is useful to force 59 * x86-64 always supports DAC, but sometimes it is useful to force