Use this function to set an sg entry to point to device resources mapped using dma_map_resource(). The page pointer is set to NULL and only the DMA address, length and offset values are valid.
Signed-off-by: Christian König christian.koenig@amd.com --- include/linux/scatterlist.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 22b2131bcdcd..f944ee4e482c 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -149,6 +149,29 @@ static inline void sg_set_buf(struct scatterlist *sg, const void *buf, sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf)); }
+/** + * sg_set_dma_addr - Set sg entry to point at specified dma address + * @sg: SG entry + * @address: DMA address to set + * @len: Length of data + * @offset: Offset into page + * + * Description: + * Use this function to set an sg entry to point to device resources mapped + * using dma_map_resource(). The page pointer is set to NULL and only the DMA + * address, length and offset values are valid. + * + **/ +static inline void sg_set_dma_addr(struct scatterlist *sg, dma_addr_t address, + unsigned int len, unsigned int offset) +{ + sg_set_page(sg, NULL, len, offset); + sg->dma_address = address; +#ifdef CONFIG_NEED_SG_DMA_LENGTH + sg->dma_length = len; +#endif +} + /* * Loop over each sg element, following the pointer to a new list if necessary */