[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3/4] x86: allow dma_get_required_mask() to be overridden
Use dma_ops->get_required_mask() if provided, defaulting to dma_get_requried_mask_from_max_pfn(). This is needed on systems (such as Xen PV guests) where the DMA address and the physical address are not equal. ARCH_HAS_DMA_GET_REQUIRED_MASK is defined in asm/device.h instead of asm/dma-mapping.h because linux/dma-mapping.h uses the define before including asm/dma-mapping.h Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> --- arch/x86/include/asm/device.h | 2 ++ arch/x86/kernel/pci-dma.c | 8 ++++++++ 2 files changed, 10 insertions(+) diff --git a/arch/x86/include/asm/device.h b/arch/x86/include/asm/device.h index 03dd729..10bc628 100644 --- a/arch/x86/include/asm/device.h +++ b/arch/x86/include/asm/device.h @@ -13,4 +13,6 @@ struct dev_archdata { struct pdev_archdata { }; +#define ARCH_HAS_DMA_GET_REQUIRED_MASK + #endif /* _ASM_X86_DEVICE_H */ diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index a25e202..5154400 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -140,6 +140,14 @@ void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr, free_pages((unsigned long)vaddr, get_order(size)); } +u64 dma_get_required_mask(struct device *dev) +{ + if (dma_ops->get_required_mask) + return dma_ops->get_required_mask(dev); + return dma_get_required_mask_from_max_pfn(dev); +} +EXPORT_SYMBOL_GPL(dma_get_required_mask); + /* * See <Documentation/x86/x86_64/boot-options.txt> for the iommu kernel * parameter documentation. -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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