forked from Minki/linux
[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>
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@ -50,10 +50,10 @@ extern int iommu_setup(char *opt);
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* address space. The networking and block device layers use
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* address space. The networking and block device layers use
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* this boolean for bounce buffer decisions
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* this boolean for bounce buffer decisions
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*
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*
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* On AMD64 it mostly equals, but we set it to zero to tell some subsystems
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* On x86-64 it mostly equals, but we set it to zero to tell some subsystems
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* that an IOMMU is available.
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* that an hard or soft IOMMU is available.
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*/
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*/
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#define PCI_DMA_BUS_IS_PHYS (no_iommu ? 1 : 0)
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#define PCI_DMA_BUS_IS_PHYS 0
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/*
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/*
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* x86-64 always supports DAC, but sometimes it is useful to force
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* x86-64 always supports DAC, but sometimes it is useful to force
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