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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org We make use of the top bit of the dma_length to indicate a P2PDMA segment. Code that uses this will need to use sg_dma_p2pdma_len() to get the length and ensure no lengths exceed 2GB. An sg_dma_is_p2pdma() helper is included to check if a particular segment is p2pdma(). Signed-off-by: Logan Gunthorpe --- include/linux/scatterlist.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 36c47e7e66a2..e738159d56f9 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -39,6 +39,10 @@ struct scatterlist { #define sg_dma_len(sg) ((sg)->length) #endif +#define SG_P2PDMA_FLAG (1U << 31) +#define sg_dma_p2pdma_len(sg) (sg_dma_len(sg) & ~SG_P2PDMA_FLAG) +#define sg_dma_is_p2pdma(sg) (sg_dma_len(sg) & SG_P2PDMA_FLAG) + struct sg_table { struct scatterlist *sgl; /* the list */ unsigned int nents; /* number of mapped entries */ -- 2.20.1 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme