| Message ID | 20151023205610.GB10197@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index ac07ff0..7eaba8d 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -95,6 +95,13 @@ static inline u64 dma_get_mask(struct device *dev) return DMA_BIT_MASK(32); } +#ifndef HAVE_ARCH_DMA_GET_PAGE_SHIFT +static inline unsigned long dma_get_page_shift(struct device *dev) +{ + return PAGE_SHIFT; +} +#endif + #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK int dma_set_coherent_mask(struct device *dev, u64 mask); #else
Drivers like NVMe need to be able to determine the page size used for DMA transfers. Add a new API that defaults to return PAGE_SHIFT on all architectures. Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com> --- v1 -> v2: Based upon feedback from Christoph Hellwig, implement the IOMMU page size lookup as a generic DMA API, rather than an architecture-specific hack. v2 -> v3: Based upon feedback from Christoph Hellwig that not all architectures have moved to dma-mapping-common.h, so move the #ifdef and default to linux/dma-mapping.h. --- include/linux/dma-mapping.h | 7 +++++++ 1 file changed, 7 insertions(+)