mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
18dabf473e
Change the page member of the scatterlist structure to be an unsigned long, and encode more stuff in the lower bits: - Bits 0 and 1 zero: this is a normal sg entry. Next sg entry is located at sg + 1. - Bit 0 set: this is a chain entry, the next real entry is at ->page_link with the two low bits masked off. - Bit 1 set: this is the final entry in the sg entry. sg_next() will return NULL when passed such an entry. It's thus important that sg table users use the proper accessors to get and set the page member. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
24 lines
712 B
C
24 lines
712 B
C
#ifndef _ASMARM_SCATTERLIST_H
|
|
#define _ASMARM_SCATTERLIST_H
|
|
|
|
#include <asm/memory.h>
|
|
#include <asm/types.h>
|
|
|
|
struct scatterlist {
|
|
unsigned long page_link;
|
|
unsigned int offset; /* buffer offset */
|
|
dma_addr_t dma_address; /* dma address */
|
|
unsigned int length; /* length */
|
|
};
|
|
|
|
/*
|
|
* These macros should be used after a pci_map_sg call has been done
|
|
* to get bus addresses of each of the SG entries and their lengths.
|
|
* You should only work with the number of sg entries pci_map_sg
|
|
* returns, or alternatively stop on the first sg_dma_len(sg) which
|
|
* is 0.
|
|
*/
|
|
#define sg_dma_address(sg) ((sg)->dma_address)
|
|
#define sg_dma_len(sg) ((sg)->length)
|
|
|
|
#endif /* _ASMARM_SCATTERLIST_H */
|