path: root/include/asm-generic/dma-mapping-common.h
diff options
authorMarek Szyprowski <>2012-06-13 10:05:52 +0200
committerMarek Szyprowski <>2012-07-30 12:25:46 +0200
commitd2b7428eb0caa7c66e34b6ac869a43915b294123 (patch)
treead30d28a2078d1d9429c8f19815378c5da2c54f5 /include/asm-generic/dma-mapping-common.h
parent955c757e090f41188764a0e488ba7036f7dbb215 (diff)
common: dma-mapping: introduce dma_get_sgtable() function
This patch adds dma_get_sgtable() function which is required to let drivers to share the buffers allocated by DMA-mapping subsystem. Right now the driver gets a dma address of the allocated buffer and the kernel virtual mapping for it. If it wants to share it with other device (= map into its dma address space) it usually hacks around kernel virtual addresses to get pointers to pages or assumes that both devices share the DMA address space. Both solutions are just hacks for the special cases, which should be avoided in the final version of buffer sharing. To solve this issue in a generic way, a new call to DMA mapping has been introduced - dma_get_sgtable(). It allocates a scatter-list which describes the allocated buffer and lets the driver(s) to use it with other device(s) by calling dma_map_sg() on it. This patch provides a generic implementation based on virt_to_page() call. Architectures which require more sophisticated translation might provide their own get_sgtable() methods. Signed-off-by: Marek Szyprowski <> Reviewed-by: Kyungmin Park <> Reviewed-by: Daniel Vetter <>
Diffstat (limited to 'include/asm-generic/dma-mapping-common.h')
1 files changed, 18 insertions, 0 deletions
diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h
index 9073aeb3bb1a..de8bf89940f8 100644
--- a/include/asm-generic/dma-mapping-common.h
+++ b/include/asm-generic/dma-mapping-common.h
@@ -213,4 +213,22 @@ static inline int dma_mmap_writecombine(struct device *dev, struct vm_area_struc
return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
+dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
+ void *cpu_addr, dma_addr_t dma_addr, size_t size);
+static inline int
+dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
+ dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
+ struct dma_map_ops *ops = get_dma_ops(dev);
+ BUG_ON(!ops);
+ if (ops->get_sgtable)
+ return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
+ attrs);
+ return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
+#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, NULL)