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Linux/include/asm-generic/scatterlist.h

  1 #ifndef __ASM_GENERIC_SCATTERLIST_H
  2 #define __ASM_GENERIC_SCATTERLIST_H
  3 
  4 #include <linux/types.h>
  5 
  6 struct scatterlist {
  7 #ifdef CONFIG_DEBUG_SG
  8         unsigned long   sg_magic;
  9 #endif
 10         unsigned long   page_link;
 11         unsigned int    offset;
 12         unsigned int    length;
 13         dma_addr_t      dma_address;
 14 #ifdef CONFIG_NEED_SG_DMA_LENGTH
 15         unsigned int    dma_length;
 16 #endif
 17 };
 18 
 19 /*
 20  * These macros should be used after a dma_map_sg call has been done
 21  * to get bus addresses of each of the SG entries and their lengths.
 22  * You should only work with the number of sg entries pci_map_sg
 23  * returns, or alternatively stop on the first sg_dma_len(sg) which
 24  * is 0.
 25  */
 26 #define sg_dma_address(sg)      ((sg)->dma_address)
 27 
 28 #ifdef CONFIG_NEED_SG_DMA_LENGTH
 29 #define sg_dma_len(sg)          ((sg)->dma_length)
 30 #else
 31 #define sg_dma_len(sg)          ((sg)->length)
 32 #endif
 33 
 34 #endif /* __ASM_GENERIC_SCATTERLIST_H */
 35 

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