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author | Muli Ben-Yehuda <mulix@mulix.org> | 2006-01-11 22:44:42 +0100 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:04:55 -0800 |
commit | 17a941d854a3f7b0bb916fdeee4c9ffdcc19d8d3 (patch) | |
tree | b6b3b55318336adf769bf57141a01a9defbbb202 /include/asm-x86_64/pci.h | |
parent | 8a6fdd3e912e0ce6f723431d66baf704bf8a1d26 (diff) | |
download | linux-17a941d854a3f7b0bb916fdeee4c9ffdcc19d8d3.tar.gz |
[PATCH] x86_64: Use function pointers to call DMA mapping functions
AK: I hacked Muli's original patch a lot and there were a lot of changes - all bugs are probably to blame on me now. There were also some changes in the fall back behaviour for swiotlb - in particular it doesn't try to use GFP_DMA now anymore. Also all DMA mapping operations use the same core dma_alloc_coherent code with proper fallbacks now. And various other changes and cleanups. Known problems: iommu=force swiotlb=force together breaks needs more testing. This patch cleans up x86_64's DMA mapping dispatching code. Right now we have three possible IOMMU types: AGP GART, swiotlb and nommu, and in the future we will also have Xen's x86_64 swiotlb and other HW IOMMUs for x86_64. In order to support all of them cleanly, this patch: - introduces a struct dma_mapping_ops with function pointers for each of the DMA mapping operations of gart (AMD HW IOMMU), swiotlb (software IOMMU) and nommu (no IOMMU). - gets rid of: if (swiotlb) return swiotlb_xxx(); - PCI_DMA_BUS_IS_PHYS is now checked against the dma_ops being set This makes swiotlb faster by avoiding double copying in some cases. Signed-Off-By: Muli Ben-Yehuda <mulix@mulix.org> Signed-Off-By: Jon D. Mason <jdmason@us.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/pci.h')
-rw-r--r-- | include/asm-x86_64/pci.h | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/include/asm-x86_64/pci.h b/include/asm-x86_64/pci.h index eeb3088a1c9e..fd03e15d7ea6 100644 --- a/include/asm-x86_64/pci.h +++ b/include/asm-x86_64/pci.h @@ -42,18 +42,20 @@ int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq); #include <asm/scatterlist.h> #include <linux/string.h> #include <asm/page.h> +#include <linux/dma-mapping.h> /* for have_iommu */ extern int iommu_setup(char *opt); -#ifdef CONFIG_GART_IOMMU /* The PCI address space does equal the physical memory * 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 AMD64 it mostly equals, but we set it to zero if a hardware + * IOMMU (gart) of sotware IOMMU (swiotlb) is available. */ -#define PCI_DMA_BUS_IS_PHYS (no_iommu ? 1 : 0) +#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys) + +#ifdef CONFIG_GART_IOMMU /* * x86-64 always supports DAC, but sometimes it is useful to force @@ -79,7 +81,6 @@ extern int iommu_sac_force; #else /* No IOMMU */ -#define PCI_DMA_BUS_IS_PHYS 1 #define pci_dac_dma_supported(pci_dev, mask) 1 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) |