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| author | Christoph Hellwig <hch@lst.de> | 2019-04-16 20:23:44 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-05-08 17:11:57 -0700 |
| commit | 8668b38c1c7720baf76da15a7a7eef43ae0c65a4 (patch) | |
| tree | 2d8cb8d460a88fc2ff57b09d94ea7fbf3391082f /arch/sparc | |
| parent | b82059428c0577c2ec082974d7956291d5eae2cf (diff) | |
| download | linux-8668b38c1c7720baf76da15a7a7eef43ae0c65a4.tar.bz2 | |
sparc/iommu: move per-page flushing into __sbus_iommu_map_page
This prepares for reusing __sbus_iommu_map_page in the map_sg path.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/mm/iommu.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c index 19d9266e4049..7e191c8ae46a 100644 --- a/arch/sparc/mm/iommu.c +++ b/arch/sparc/mm/iommu.c @@ -207,15 +207,25 @@ static u32 iommu_get_one(struct device *dev, phys_addr_t paddr, int npages) } static dma_addr_t __sbus_iommu_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t len) + unsigned long offset, size_t len, bool per_page_flush) { void *vaddr = page_address(page) + offset; unsigned long off = (unsigned long)vaddr & ~PAGE_MASK; unsigned long npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT; - + /* XXX So what is maxphys for us and how do drivers know it? */ if (!len || len > 256 * 1024) return DMA_MAPPING_ERROR; + + if (per_page_flush) { + unsigned long p = (unsigned long)vaddr & PAGE_MASK; + + while (p < (unsigned long)vaddr + len) { + flush_page_for_dma(p); + p += PAGE_SIZE; + } + } + return iommu_get_one(dev, virt_to_phys(vaddr), npages) + off; } @@ -224,22 +234,14 @@ static dma_addr_t sbus_iommu_map_page_gflush(struct device *dev, enum dma_data_direction dir, unsigned long attrs) { flush_page_for_dma(0); - return __sbus_iommu_map_page(dev, page, offset, len); + return __sbus_iommu_map_page(dev, page, offset, len, false); } static dma_addr_t sbus_iommu_map_page_pflush(struct device *dev, struct page *page, unsigned long offset, size_t len, enum dma_data_direction dir, unsigned long attrs) { - void *vaddr = page_address(page) + offset; - unsigned long p = ((unsigned long)vaddr) & PAGE_MASK; - - while (p < (unsigned long)vaddr + len) { - flush_page_for_dma(p); - p += PAGE_SIZE; - } - - return __sbus_iommu_map_page(dev, page, offset, len); + return __sbus_iommu_map_page(dev, page, offset, len, true); } static int __sbus_iommu_map_sg(struct device *dev, struct scatterlist *sgl, |