[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/4] dma: add dma_get_required_mask_from_max_pfn()
A generic dma_get_required_mask() is useful even for architectures (such as ia64) that define ARCH_HAS_GET_REQUIRED_MASK. Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> --- drivers/base/platform.c | 10 ++++++++-- include/linux/dma-mapping.h | 1 + 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/base/platform.c b/drivers/base/platform.c index b2afc29..f9f3930 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -1009,8 +1009,7 @@ int __init platform_bus_init(void) return error; } -#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK -u64 dma_get_required_mask(struct device *dev) +u64 dma_get_required_mask_from_max_pfn(struct device *dev) { u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); @@ -1028,6 +1027,13 @@ u64 dma_get_required_mask(struct device *dev) } return mask; } +EXPORT_SYMBOL_GPL(dma_get_required_mask_from_max_pfn); + +#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK +u64 dma_get_required_mask(struct device *dev) +{ + return dma_get_required_mask_from_max_pfn(dev); +} EXPORT_SYMBOL_GPL(dma_get_required_mask); #endif diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index d5d3881..6e2fdfc 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -127,6 +127,7 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask) return dma_set_mask_and_coherent(dev, mask); } +extern u64 dma_get_required_mask_from_max_pfn(struct device *dev); extern u64 dma_get_required_mask(struct device *dev); #ifndef set_arch_dma_coherent_ops -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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