Share the code for the global and per-page flush map_sg loops using a simple bool parameter to disable the per-page flush for the former variant.
Signed-off-by: Christoph Hellwig <[email protected]> Reported-by: Guenter Roeck <[email protected]> --- arch/sparc/mm/iommu.c | 37 +++++++++++++++++-------------------- 1 file changed, 17 insertions(+), 20 deletions(-) diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c index 7cb9ddda7531..f90d943a3a27 100644 --- a/arch/sparc/mm/iommu.c +++ b/arch/sparc/mm/iommu.c @@ -241,25 +241,9 @@ static dma_addr_t sbus_iommu_map_page_pflush(struct device *dev, return __sbus_iommu_map_page(dev, page, offset, len); } -static int sbus_iommu_map_sg_gflush(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, unsigned long attrs) -{ - struct scatterlist *sg; - int i, n; - - flush_page_for_dma(0); - - for_each_sg(sgl, sg, nents, i) { - n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT; - sg->dma_address = iommu_get_one(dev, sg_page(sg), n) + sg->offset; - sg->dma_length = sg->length; - } - - return nents; -} - -static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, unsigned long attrs) +static int __sbus_iommu_map_sg(struct device *dev, struct scatterlist *sgl, + int nents, enum dma_data_direction dir, unsigned long attrs, + bool per_page_flush) { unsigned long page, oldpage = 0; struct scatterlist *sg; @@ -273,7 +257,7 @@ static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sgl, * XXX Is this a good assumption? * XXX What if someone else unmaps it here and races us? */ - if (!PageHighMem(sg_page(sg))) { + if (per_page_flush && !PageHighMem(sg_page(sg))) { page = (unsigned long)page_address(sg_page(sg)); for (i = 0; i < n; i++) { if (page != oldpage) { /* Already flushed? */ @@ -291,6 +275,19 @@ static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sgl, return nents; } +static int sbus_iommu_map_sg_gflush(struct device *dev, struct scatterlist *sgl, + int nents, enum dma_data_direction dir, unsigned long attrs) +{ + flush_page_for_dma(0); + return __sbus_iommu_map_sg(dev, sgl, nents, dir, attrs, false); +} + +static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sgl, + int nents, enum dma_data_direction dir, unsigned long attrs) +{ + return __sbus_iommu_map_sg(dev, sgl, nents, dir, attrs, true); +} + static void sbus_iommu_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t len, enum dma_data_direction dir, unsigned long attrs) { -- 2.20.1
