From mboxrd@z Thu Jan 1 00:00:00 1970 From: nacc@linux.vnet.ibm.com (Nishanth Aravamudan) Date: Fri, 23 Oct 2015 14:01:15 -0700 Subject: [RFC PATCH 6/7] sparc/dma-mapping: override dma_get_page_shift In-Reply-To: <20151023205420.GA10197@linux.vnet.ibm.com> References: <20151023205420.GA10197@linux.vnet.ibm.com> Message-ID: <20151023210115.GH10197@linux.vnet.ibm.com> On sparc, the kernel's page size differs from the IOMMU's page size, so override the generic implementation, which always returns the kernel's page size, and return IOMMU_PAGE_SHIFT instead. Signed-off-by: Nishanth Aravamudan --- I know very little about sparc, so please correct me if this patch is invalid. arch/sparc/include/asm/dma-mapping.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/sparc/include/asm/dma-mapping.h b/arch/sparc/include/asm/dma-mapping.h index a21da59..76ba470 100644 --- a/arch/sparc/include/asm/dma-mapping.h +++ b/arch/sparc/include/asm/dma-mapping.h @@ -52,6 +52,14 @@ static inline int dma_set_mask(struct device *dev, u64 mask) return -EINVAL; } +/* for IOMMU_PAGE_SHIFT */ +#include +#define HAVE_ARCH_DMA_GET_PAGE_SHIFT 1 +static inline unsigned long dma_get_page_shift(struct device *dev) +{ + return IOMMU_PAGE_SHIFT; +} + #include #endif -- 1.9.1