diff options
| author | Christoph Hellwig <hch@lst.de> | 2018-08-20 15:56:05 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-10-19 08:44:39 +0200 |
| commit | 4803b44e68fc08e76f00dec90074d199a11ad6f5 (patch) | |
| tree | 65c623ccd532141da3e01b6a084ab405112607d8 /kernel | |
| parent | swiotlb: merge swiotlb_unmap_page and unmap_single (diff) | |
| download | linux-4803b44e68fc08e76f00dec90074d199a11ad6f5.tar.xz linux-4803b44e68fc08e76f00dec90074d199a11ad6f5.zip | |
swiotlb: use swiotlb_map_page in swiotlb_map_sg_attrs
No need to duplicate the code - map_sg is equivalent to map_page
for each page in the scatterlist.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/dma/swiotlb.c | 34 |
1 files changed, 12 insertions, 22 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 15335f3a1bf3..15755d7a5242 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -845,37 +845,27 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, * same here. */ int -swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, +swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nelems, enum dma_data_direction dir, unsigned long attrs) { struct scatterlist *sg; int i; - BUG_ON(dir == DMA_NONE); - for_each_sg(sgl, sg, nelems, i) { - phys_addr_t paddr = sg_phys(sg); - dma_addr_t dev_addr = phys_to_dma(hwdev, paddr); - - if (swiotlb_force == SWIOTLB_FORCE || - !dma_capable(hwdev, dev_addr, sg->length)) { - phys_addr_t map = map_single(hwdev, sg_phys(sg), - sg->length, dir, attrs); - if (map == SWIOTLB_MAP_ERROR) { - /* Don't panic here, we expect map_sg users - to do proper error handling. */ - attrs |= DMA_ATTR_SKIP_CPU_SYNC; - swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir, - attrs); - sg_dma_len(sgl) = 0; - return 0; - } - sg->dma_address = __phys_to_dma(hwdev, map); - } else - sg->dma_address = dev_addr; + sg->dma_address = swiotlb_map_page(dev, sg_page(sg), sg->offset, + sg->length, dir, attrs); + if (sg->dma_address == DIRECT_MAPPING_ERROR) + goto out_error; sg_dma_len(sg) = sg->length; } + return nelems; + +out_error: + swiotlb_unmap_sg_attrs(dev, sgl, i, dir, + attrs | DMA_ATTR_SKIP_CPU_SYNC); + sg_dma_len(sgl) = 0; + return 0; } /* |