include/linux/scatterlist.h

41 		struct scatterlist *sg;
56 	struct scatterlist *sg;
63 #define	sg_dma_address(sg)	(sg)->address
64 #define	sg_dma_len(sg)		(sg)->length
65 #define	sg_page(sg)		(sg)->sl_un.page
66 #define	sg_scatternext(sg)	(sg)->sl_un.sg
72 sg_set_page(struct scatterlist *sg, struct page *page, unsigned int len,
75 	sg_page(sg) = page;
76 	sg_dma_len(sg) = len;
77 	sg->offset = offset;
83 sg_set_buf(struct scatterlist *sg, const void *buf, unsigned int buflen)
85 	sg_set_page(sg, virt_to_page(buf), buflen,
90 sg_init_table(struct scatterlist *sg, unsigned int nents)
92 	bzero(sg, sizeof(*sg) * nents);
93 	sg[nents - 1].flags = SG_END;
97 sg_next(struct scatterlist *sg)
99 	if (sg->flags & SG_END)
101 	sg++;
102 	if (sg->flags & SG_CHAIN)
103 		sg = sg_scatternext(sg);
104 	return (sg);
108 sg_phys(struct scatterlist *sg)
110 	return sg_page(sg)->phys_addr + sg->offset;
117 	struct scatterlist *sg = &prv[prv_nents - 1];
119 	sg->offset = 0;
120 	sg->length = 0;
121 	sg->flags = SG_CHAIN;
122 	sg->sl_un.sg = sgl;
126 sg_mark_end(struct scatterlist *sg)
128 	sg->flags = SG_END;
145 			next = sgl[max_ents - 1].sl_un.sg;
171 	struct scatterlist *sg, *prv;
192 		sg = kmalloc(alloc_size * sizeof(struct scatterlist), gfp_mask);
193 		if (unlikely(!sg)) {
199 		sg_init_table(sg, alloc_size);
203 			sg_chain(prv, max_ents, sg);
205 			table->sgl = sg;
208 			sg_mark_end(&sg[sg_size - 1]);
210 		prv = sg;
232 	struct scatterlist *sg;
235 	sg = iter->sg;
236 	pgcount = (sg->offset + sg->length + PAGE_SIZE - 1) >> PAGE_SHIFT;
241 		sg = sg_next(sg);
243 		if (sg == NULL || iter->maxents == 0)
245 		pgcount = (sg->offset + sg->length + PAGE_SIZE - 1) >> PAGE_SHIFT;
247 	iter->sg = sg;
255 		iter->sg = sgl;
260 		iter->sg = NULL;
269 	return spi->sg->address + (spi->sg_pgoffset << PAGE_SHIFT);
274 	     (iter)->sg; _sg_iter_next(iter))
276 #define	for_each_sg(sglist, sg, sgmax, _itr)				\
277 	for (_itr = 0, sg = (sglist); _itr < (sgmax); _itr++, sg = sg_next(sg))