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swiotlb: Split size parameter to map/unmap APIs

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This splits the size parameter to swiotlb_tbl_map_single() and
swiotlb_tbl_unmap_single() into an alloc_size and a mapping_size
parameter, where the latter one is rounded up to the iommu page
size.

Suggested-by: Christoph Hellwig <[email protected]>
Signed-off-by: Lu Baolu <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
This commit is contained in:
Lu Baolu 2019-09-06 14:14:48 +08:00 • committed by Joerg Roedel
commit 3fc1ca0065
4 changed files with 32 additions and 20 deletions
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8
drivers/xen/swiotlb-xen.c
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@ -386,8 +386,8 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
*/
trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir,
attrs);
map = swiotlb_tbl_map_single(dev, start_dma_addr, phys,
size, size, dir, attrs);
if (map == (phys_addr_t)DMA_MAPPING_ERROR)
return DMA_MAPPING_ERROR;
@ -397,7 +397,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
* Ensure that the address returned is DMA'ble
*/
if (unlikely(!dma_capable(dev, dev_addr, size))) {
swiotlb_tbl_unmap_single(dev, map, size, dir,
swiotlb_tbl_unmap_single(dev, map, size, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
return DMA_MAPPING_ERROR;
}
@ -433,7 +433,7 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
/* NOTE: We use dev_addr here, not paddr! */
if (is_xen_swiotlb_buffer(dev_addr))
swiotlb_tbl_unmap_single(hwdev, paddr, size, dir, attrs);
swiotlb_tbl_unmap_single(hwdev, paddr, size, size, dir, attrs);
}
static void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,