diff options
Diffstat (limited to 'include/linux/scatterlist.h')
| -rw-r--r-- | include/linux/scatterlist.h | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index d87dfa41142d..22b2131bcdcd 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -22,6 +22,12 @@ struct scatterlist { }; /* + * Since the above length field is an unsigned int, below we define the maximum + * length in bytes that can be stored in one scatterlist entry. + */ +#define SCATTERLIST_MAX_SEGMENT (UINT_MAX & PAGE_MASK) + +/* * These macros should be used after a dma_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 dma_map_sg @@ -262,10 +268,24 @@ void sg_free_table(struct sg_table *); int __sg_alloc_table(struct sg_table *, unsigned int, unsigned int, struct scatterlist *, gfp_t, sg_alloc_fn *); int sg_alloc_table(struct sg_table *, unsigned int, gfp_t); -int sg_alloc_table_from_pages(struct sg_table *sgt, - struct page **pages, unsigned int n_pages, - unsigned long offset, unsigned long size, - gfp_t gfp_mask); +int __sg_alloc_table_from_pages(struct sg_table *sgt, struct page **pages, + unsigned int n_pages, unsigned int offset, + unsigned long size, unsigned int max_segment, + gfp_t gfp_mask); +int sg_alloc_table_from_pages(struct sg_table *sgt, struct page **pages, + unsigned int n_pages, unsigned int offset, + unsigned long size, gfp_t gfp_mask); + +#ifdef CONFIG_SGL_ALLOC +struct scatterlist *sgl_alloc_order(unsigned long long length, + unsigned int order, bool chainable, + gfp_t gfp, unsigned int *nent_p); +struct scatterlist *sgl_alloc(unsigned long long length, gfp_t gfp, + unsigned int *nent_p); +void sgl_free_n_order(struct scatterlist *sgl, int nents, int order); +void sgl_free_order(struct scatterlist *sgl, int order); +void sgl_free(struct scatterlist *sgl); +#endif /* CONFIG_SGL_ALLOC */ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, size_t buflen, off_t skip, bool to_buffer); |