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authorChristoph Hellwig <hch@lst.de>2018-01-09 18:44:16 +0300
committerChristoph Hellwig <hch@lst.de>2018-01-15 11:35:45 +0300
commit251533eb35b22f9e87a440b14c6f20e2626397b3 (patch)
tree11ac4d11d10b40b73245103f9eddbecb65d7859b /include/linux/swiotlb.h
parent7f2c8bbd321f18e4ccfd262748bd58fb7d4bb1db (diff)
downloadlinux-251533eb35b22f9e87a440b14c6f20e2626397b3.tar.xz
swiotlb: add common swiotlb_map_ops
Currently all architectures that want to use swiotlb have to implement their own dma_map_ops instances. Provide a generic one based on the x86 implementation which first calls into dma_direct to try a full blown direct mapping implementation (including e.g. CMA) before falling back allocating from the swiotlb buffer. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Christian König <christian.koenig@amd.com>
Diffstat (limited to 'include/linux/swiotlb.h')
-rw-r--r--include/linux/swiotlb.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 606375e35d87..5b1f2a00491c 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -66,6 +66,12 @@ extern void swiotlb_tbl_sync_single(struct device *hwdev,
enum dma_sync_target target);
/* Accessory functions. */
+
+void *swiotlb_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
+ gfp_t flags, unsigned long attrs);
+void swiotlb_free(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_addr, unsigned long attrs);
+
extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags);
@@ -126,4 +132,6 @@ extern void swiotlb_print_info(void);
extern int is_swiotlb_buffer(phys_addr_t paddr);
extern void swiotlb_set_max_segment(unsigned int);
+extern const struct dma_map_ops swiotlb_dma_ops;
+
#endif /* __LINUX_SWIOTLB_H */