linux-master/lib/scatterlist.c

91  * @sgl:	First entry in the scatterlist
98  *   Note that the @sgl@ pointer passed in need not be the first one,
100  *   exist from @sgl@.
103 struct scatterlist *sg_last(struct scatterlist *sgl, unsigned int nents)
108 	for_each_sg(sgl, sg, nents, i)
118  * @sgl:	   The SG table
126 void sg_init_table(struct scatterlist *sgl, unsigned int nents)
128 	memset(sgl, 0, sizeof(*sgl) * nents);
129 	sg_init_marker(sgl, nents);
199 	struct scatterlist *sgl, *next;
202 	if (unlikely(!table->sgl))
205 	sgl = table->sgl;
217 			next = sg_chain_ptr(&sgl[curr_max_ents - 1]);
229 			free_fn(sgl, alloc_size);
230 		sgl = next;
234 	table->sgl = NULL;
346 			table->sgl = sg;
410 		table->sgt.sgl = new_sg;
615 	struct scatterlist *sgl, *sg;
631 	sgl = kmalloc_array(nalloc, sizeof(struct scatterlist),
633 	if (!sgl)
636 	sg_init_table(sgl, nalloc);
637 	sg = sgl;
642 			sgl_free_order(sgl, order);
653 	return sgl;
674  * @sgl: Scatterlist with one or more elements
685 void sgl_free_n_order(struct scatterlist *sgl, int nents, int order)
691 	for_each_sg(sgl, sg, nents, i) {
698 	kfree(sgl);
704  * @sgl: Scatterlist with one or more elements
707 void sgl_free_order(struct scatterlist *sgl, int order)
709 	sgl_free_n_order(sgl, INT_MAX, order);
715  * @sgl: Scatterlist with one or more elements
717 void sgl_free(struct scatterlist *sgl)
719 	sgl_free_order(sgl, 0);
790  * @sgl: sg list to iterate over
800 void sg_miter_start(struct sg_mapping_iter *miter, struct scatterlist *sgl,
805 	__sg_page_iter_start(&miter->piter, sgl, nents, 0);
951  * @sgl:		 The SG list
962 size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
974 	sg_miter_start(&miter, sgl, nents, sg_flags);
1000  * @sgl:		 The SG list
1008 size_t sg_copy_from_buffer(struct scatterlist *sgl, unsigned int nents,
1011 	return sg_copy_buffer(sgl, nents, (void *)buf, buflen, 0, false);
1017  * @sgl:		 The SG list
1025 size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents,
1028 	return sg_copy_buffer(sgl, nents, buf, buflen, 0, true);
1034  * @sgl:		 The SG list
1043 size_t sg_pcopy_from_buffer(struct scatterlist *sgl, unsigned int nents,
1046 	return sg_copy_buffer(sgl, nents, (void *)buf, buflen, skip, false);
1052  * @sgl:		 The SG list
1061 size_t sg_pcopy_to_buffer(struct scatterlist *sgl, unsigned int nents,
1064 	return sg_copy_buffer(sgl, nents, buf, buflen, skip, true);
1070  * @sgl:		 The SG list
1077 size_t sg_zero_buffer(struct scatterlist *sgl, unsigned int nents,
1084 	sg_miter_start(&miter, sgl, nents, sg_flags);
1113 	struct scatterlist *sg = sgtable->sgl + sgtable->nents;
1120 	pages = (void *)sgtable->sgl +
1153 		unpin_user_page(sg_page(&sgtable->sgl[--sgtable->nents]));
1168 	struct scatterlist *sg = sgtable->sgl + sgtable->nents;
1214 	struct scatterlist *sg = sgtable->sgl + sgtable->nents;
1274 	struct scatterlist *sg = sgtable->sgl + sgtable->nents;