From 34f8be79a772094a96da83f52f247cff2bc13978 Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Wed, 14 Dec 2016 15:04:43 -0800 Subject: arch/frv: add option to skip sync on DMA map The use of DMA_ATTR_SKIP_CPU_SYNC was not consistent across all of the DMA APIs in the arch/arm folder. This change is meant to correct that so that we get consistent behavior. Link: http://lkml.kernel.org/r/20161110113447.76501.93160.stgit@ahduyck-blue-test.jf.intel.com Signed-off-by: Alexander Duyck Cc: David Howells Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/frv/mb93090-mb00/pci-dma.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'arch/frv/mb93090-mb00/pci-dma.c') diff --git a/arch/frv/mb93090-mb00/pci-dma.c b/arch/frv/mb93090-mb00/pci-dma.c index f585745b1abc..dba7df918144 100644 --- a/arch/frv/mb93090-mb00/pci-dma.c +++ b/arch/frv/mb93090-mb00/pci-dma.c @@ -40,13 +40,16 @@ static int frv_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction, unsigned long attrs) { + struct scatterlist *sg; unsigned long dampr2; void *vaddr; int i; - struct scatterlist *sg; BUG_ON(direction == DMA_NONE); + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + return nents; + dampr2 = __get_DAMPR(2); for_each_sg(sglist, sg, nents, i) { @@ -70,7 +73,9 @@ static dma_addr_t frv_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, unsigned long attrs) { - flush_dcache_page(page); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + flush_dcache_page(page); + return (dma_addr_t) page_to_phys(page) + offset; } -- cgit v1.2.3-59-g8ed1b