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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-02 13:22:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-02 13:22:38 -0700
commitd975f309a8b250e67b66eabeb56be6989c783629 (patch)
tree846cae85891024f7c45416d085df90d98ec2e51b
parent52b084d31cbc8e90cb6fc1ac4061d9a24375c89d (diff)
parentf8bcbe62acd0e1ce9004b83e98a4af87ae385dcf (diff)
downloadlinux-sh-d975f309a8b250e67b66eabeb56be6989c783629.tar.gz
Merge branch 'for-4.3/sg' of git://git.kernel.dk/linux-block
Pull SG updates from Jens Axboe: "This contains a set of scatter-gather related changes/fixes for 4.3: - Add support for limited chaining of sg tables even for architectures that do not set ARCH_HAS_SG_CHAIN. From Christoph. - Add sg chain support to target_rd. From Christoph. - Fixup open coded sg->page_link in crypto/omap-sham. From Christoph. - Fixup open coded crypto ->page_link manipulation. From Dan. - Also from Dan, automated fixup of manual sg_unmark_end() manipulations. - Also from Dan, automated fixup of open coded sg_phys() implementations. - From Robert Jarzmik, addition of an sg table splitting helper that drivers can use" * 'for-4.3/sg' of git://git.kernel.dk/linux-block: lib: scatterlist: add sg splitting function scatterlist: use sg_phys() crypto/omap-sham: remove an open coded access to ->page_link scatterlist: remove open coded sg_unmark_end instances crypto: replace scatterwalk_sg_chain with sg_chain target/rd: always chain S/G list scatterlist: allow limited chaining without ARCH_HAS_SG_CHAIN
-rw-r--r--arch/arm/mm/dma-mapping.c2
-rw-r--r--arch/microblaze/kernel/dma.c3
-rw-r--r--block/blk-merge.c2
-rw-r--r--crypto/algif_skcipher.c2
-rw-r--r--crypto/gcm.c4
-rw-r--r--drivers/crypto/bfin_crc.c3
-rw-r--r--drivers/crypto/omap-sham.c2
-rw-r--r--drivers/crypto/qce/sha.c2
-rw-r--r--drivers/crypto/sahara.c2
-rw-r--r--drivers/crypto/talitos.c2
-rw-r--r--drivers/iommu/intel-iommu.c4
-rw-r--r--drivers/iommu/iommu.c2
-rw-r--r--drivers/mmc/card/queue.c4
-rw-r--r--drivers/staging/android/ion/ion_chunk_heap.c4
-rw-r--r--drivers/target/target_core_rd.c44
-rw-r--r--include/crypto/scatterwalk.h10
-rw-r--r--include/linux/scatterlist.h9
-rw-r--r--lib/Kconfig7
-rw-r--r--lib/Makefile1
-rw-r--r--lib/scatterlist.c4
-rw-r--r--lib/sg_split.c202
21 files changed, 234 insertions, 81 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index cba12f34ff77..3d3d6aa60c87 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1520,7 +1520,7 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
return -ENOMEM;
for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) {
- phys_addr_t phys = page_to_phys(sg_page(s));
+ phys_addr_t phys = sg_phys(s) & PAGE_MASK;
unsigned int len = PAGE_ALIGN(s->offset + s->length);
if (!is_coherent &&
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index bf4dec229437..c89da6312954 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c
@@ -61,8 +61,7 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
/* FIXME this part of code is untested */
for_each_sg(sgl, sg, nents, i) {
sg->dma_address = sg_phys(sg);
- __dma_sync(page_to_phys(sg_page(sg)) + sg->offset,
- sg->length, direction);
+ __dma_sync(sg_phys(sg), sg->length, direction);
}
return nents;
diff --git a/block/blk-merge.c b/block/blk-merge.c
index b2625271a572..d088cffb8105 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -393,7 +393,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
if (rq->cmd_flags & REQ_WRITE)
memset(q->dma_drain_buffer, 0, q->dma_drain_size);
- sg->page_link &= ~0x02;
+ sg_unmark_end(sg);
sg = sg_next(sg);
sg_set_page(sg, virt_to_page(q->dma_drain_buffer),
q->dma_drain_size,
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 945075292bc9..af31a0ee4057 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -145,7 +145,7 @@ static int skcipher_alloc_sgl(struct sock *sk)
sgl->cur = 0;
if (sg)
- scatterwalk_sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg);
+ sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg);
list_add_tail(&sgl->list, &ctx->tsgl);
}
diff --git a/crypto/gcm.c b/crypto/gcm.c
index ddb4f29b2fe6..bec329b3de8d 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -206,14 +206,14 @@ static void crypto_gcm_init_common(struct aead_request *req)
sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
if (sg != pctx->src + 1)
- scatterwalk_sg_chain(pctx->src, 2, sg);
+ sg_chain(pctx->src, 2, sg);
if (req->src != req->dst) {
sg_init_table(pctx->dst, 3);
sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
if (sg != pctx->dst + 1)
- scatterwalk_sg_chain(pctx->dst, 2, sg);
+ sg_chain(pctx->dst, 2, sg);
}
}
diff --git a/drivers/crypto/bfin_crc.c b/drivers/crypto/bfin_crc.c
index d9af9403ab6c..2f0b3337505d 100644
--- a/drivers/crypto/bfin_crc.c
+++ b/drivers/crypto/bfin_crc.c
@@ -370,8 +370,7 @@ static int bfin_crypto_crc_handle_queue(struct bfin_crypto_crc *crc,
sg_init_table(ctx->bufsl, nsg);
sg_set_buf(ctx->bufsl, ctx->buflast, ctx->buflast_len);
if (nsg > 1)
- scatterwalk_sg_chain(ctx->bufsl, nsg,
- req->src);
+ sg_chain(ctx->bufsl, nsg, req->src);
ctx->sg = ctx->bufsl;
} else
ctx->sg = req->src;
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index b2024c95a3cf..48adb2a0903e 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -588,7 +588,7 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
* the dmaengine may try to DMA the incorrect amount of data.
*/
sg_init_table(&ctx->sgl, 1);
- ctx->sgl.page_link = ctx->sg->page_link;
+ sg_assign_page(&ctx->sgl, sg_page(ctx->sg));
ctx->sgl.offset = ctx->sg->offset;
sg_dma_len(&ctx->sgl) = len32;
sg_dma_address(&ctx->sgl) = sg_dma_address(ctx->sg);
diff --git a/drivers/crypto/qce/sha.c b/drivers/crypto/qce/sha.c
index 5c5df1d17f90..be2f5049256a 100644
--- a/drivers/crypto/qce/sha.c
+++ b/drivers/crypto/qce/sha.c
@@ -296,7 +296,7 @@ static int qce_ahash_update(struct ahash_request *req)
if (rctx->buflen) {
sg_init_table(rctx->sg, 2);
sg_set_buf(rctx->sg, rctx->tmpbuf, rctx->buflen);
- scatterwalk_sg_chain(rctx->sg, 2, req->src);
+ sg_chain(rctx->sg, 2, req->src);
req->src = rctx->sg;
}
diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index 1c19e44c3146..820dc3acb28c 100644
--- a/drivers/crypto/sahara.c
+++ b/drivers/crypto/sahara.c
@@ -999,7 +999,7 @@ static int sahara_sha_prepare_request(struct ahash_request *req)
sg_init_table(rctx->in_sg_chain, 2);
sg_set_buf(rctx->in_sg_chain, rctx->rembuf, rctx->buf_cnt);
- scatterwalk_sg_chain(rctx->in_sg_chain, 2, req->src);
+ sg_chain(rctx->in_sg_chain, 2, req->src);
rctx->total = req->nbytes + rctx->buf_cnt;
rctx->in_sg = rctx->in_sg_chain;
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index cd774534d987..3b20a1bce703 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1929,7 +1929,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
sg_init_table(req_ctx->bufsl, nsg);
sg_set_buf(req_ctx->bufsl, req_ctx->buf, req_ctx->nbuf);
if (nsg > 1)
- scatterwalk_sg_chain(req_ctx->bufsl, 2, areq->src);
+ sg_chain(req_ctx->bufsl, 2, areq->src);
req_ctx->psrc = req_ctx->bufsl;
} else
req_ctx->psrc = areq->src;
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 697291aceea7..c82ebee6c7e5 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2103,7 +2103,7 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
sg_res = aligned_nrpages(sg->offset, sg->length);
sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset;
sg->dma_length = sg->length;
- pteval = page_to_phys(sg_page(sg)) | prot;
+ pteval = (sg_phys(sg) & PAGE_MASK) | prot;
phys_pfn = pteval >> VTD_PAGE_SHIFT;
}
@@ -3631,7 +3631,7 @@ static int intel_nontranslate_map_sg(struct device *hddev,
for_each_sg(sglist, sg, nelems, i) {
BUG_ON(!sg_page(sg));
- sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
+ sg->dma_address = sg_phys(sg);
sg->dma_length = sg->length;
}
return nelems;
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f286090931cc..049df495c274 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1408,7 +1408,7 @@ size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
for_each_sg(sg, s, nents, i) {
- phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
+ phys_addr_t phys = sg_phys(s);
/*
* We are mapping on IOMMU page boundaries, so offset within
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 5daf302835b1..6f4323c6d653 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -467,7 +467,7 @@ static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
sg_set_buf(__sg, buf + offset, len);
offset += len;
remain -= len;
- (__sg++)->page_link &= ~0x02;
+ sg_unmark_end(__sg++);
sg_len++;
} while (remain);
}
@@ -475,7 +475,7 @@ static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
list_for_each_entry(req, &packed->list, queuelist) {
sg_len += blk_rq_map_sg(mq->queue, req, __sg);
__sg = sg + (sg_len - 1);
- (__sg++)->page_link &= ~0x02;
+ sg_unmark_end(__sg++);
}
sg_mark_end(sg + (sg_len - 1));
return sg_len;
diff --git a/drivers/staging/android/ion/ion_chunk_heap.c b/drivers/staging/android/ion/ion_chunk_heap.c
index 0813163f962f..195c41d7bd53 100644
--- a/drivers/staging/android/ion/ion_chunk_heap.c
+++ b/drivers/staging/android/ion/ion_chunk_heap.c
@@ -81,7 +81,7 @@ static int ion_chunk_heap_allocate(struct ion_heap *heap,
err:
sg = table->sgl;
for (i -= 1; i >= 0; i--) {
- gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
+ gen_pool_free(chunk_heap->pool, sg_phys(sg) & PAGE_MASK,
sg->length);
sg = sg_next(sg);
}
@@ -109,7 +109,7 @@ static void ion_chunk_heap_free(struct ion_buffer *buffer)
DMA_BIDIRECTIONAL);
for_each_sg(table->sgl, sg, table->nents, i) {
- gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
+ gen_pool_free(chunk_heap->pool, sg_phys(sg) & PAGE_MASK,
sg->length);
}
chunk_heap->allocated -= allocated_size;
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index 384cf8894411..47a833f3a145 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -138,16 +138,12 @@ static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *
sg_per_table = (total_sg_needed > max_sg_per_table) ?
max_sg_per_table : total_sg_needed;
-#ifdef CONFIG_ARCH_HAS_SG_CHAIN
-
/*
* Reserve extra element for chain entry
*/
if (sg_per_table < total_sg_needed)
chain_entry = 1;
-#endif /* CONFIG_ARCH_HAS_SG_CHAIN */
-
sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg),
GFP_KERNEL);
if (!sg) {
@@ -158,15 +154,11 @@ static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *
sg_init_table(sg, sg_per_table + chain_entry);
-#ifdef CONFIG_ARCH_HAS_SG_CHAIN
-
if (i > 0) {
sg_chain(sg_table[i - 1].sg_table,
max_sg_per_table + 1, sg);
}
-#endif /* CONFIG_ARCH_HAS_SG_CHAIN */
-
sg_table[i].sg_table = sg;
sg_table[i].rd_sg_count = sg_per_table;
sg_table[i].page_start_offset = page_offset;
@@ -430,42 +422,6 @@ static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read)
prot_sg = &prot_table->sg_table[prot_page -
prot_table->page_start_offset];
-#ifndef CONFIG_ARCH_HAS_SG_CHAIN
-
- prot_npages = DIV_ROUND_UP(prot_offset + sectors * se_dev->prot_length,
- PAGE_SIZE);
-
- /*
- * Allocate temporaly contiguous scatterlist entries if prot pages
- * straddles multiple scatterlist tables.
- */
- if (prot_table->page_end_offset < prot_page + prot_npages - 1) {
- int i;
-
- prot_sg = kcalloc(prot_npages, sizeof(*prot_sg), GFP_KERNEL);
- if (!prot_sg)
- return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-
- need_to_release = true;
- sg_init_table(prot_sg, prot_npages);
-
- for (i = 0; i < prot_npages; i++) {
- if (prot_page + i > prot_table->page_end_offset) {
- prot_table = rd_get_prot_table(dev,
- prot_page + i);
- if (!prot_table) {
- kfree(prot_sg);
- return rc;
- }
- sg_unmark_end(&prot_sg[i - 1]);
- }
- prot_sg[i] = prot_table->sg_table[prot_page + i -
- prot_table->page_start_offset];
- }
- }
-
-#endif /* !CONFIG_ARCH_HAS_SG_CHAIN */
-
if (is_read)
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
prot_sg, prot_offset);
diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
index 96670e7e7c14..35f99b68d037 100644
--- a/include/crypto/scatterwalk.h
+++ b/include/crypto/scatterwalk.h
@@ -25,14 +25,6 @@
#include <linux/scatterlist.h>
#include <linux/sched.h>
-static inline void scatterwalk_sg_chain(struct scatterlist *sg1, int num,
- struct scatterlist *sg2)
-{
- sg_set_page(&sg1[num - 1], (void *)sg2, 0, 0);
- sg1[num - 1].page_link &= ~0x02;
- sg1[num - 1].page_link |= 0x01;
-}
-
static inline void scatterwalk_crypto_chain(struct scatterlist *head,
struct scatterlist *sg,
int chain, int num)
@@ -43,7 +35,7 @@ static inline void scatterwalk_crypto_chain(struct scatterlist *head,
}
if (sg)
- scatterwalk_sg_chain(head, num, sg);
+ sg_chain(head, num, sg);
else
sg_mark_end(head);
}
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 9b1ef0c820a7..556ec1ea2574 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -161,10 +161,6 @@ static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
struct scatterlist *sgl)
{
-#ifndef CONFIG_ARCH_HAS_SG_CHAIN
- BUG();
-#endif
-
/*
* offset and length are unused for chain entry. Clear them.
*/
@@ -251,6 +247,11 @@ struct scatterlist *sg_next(struct scatterlist *);
struct scatterlist *sg_last(struct scatterlist *s, unsigned int);
void sg_init_table(struct scatterlist *, unsigned int);
void sg_init_one(struct scatterlist *, const void *, unsigned int);
+int sg_split(struct scatterlist *in, const int in_mapped_nents,
+ const off_t skip, const int nb_splits,
+ const size_t *split_sizes,
+ struct scatterlist **out, int *out_mapped_nents,
+ gfp_t gfp_mask);
typedef struct scatterlist *(sg_alloc_fn)(unsigned int, gfp_t);
typedef void (sg_free_fn)(struct scatterlist *, unsigned int);
diff --git a/lib/Kconfig b/lib/Kconfig
index 3a2ef67db6c7..dc516164415a 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -521,6 +521,13 @@ config UCS2_STRING
source "lib/fonts/Kconfig"
+config SG_SPLIT
+ def_bool n
+ help
+ Provides a heler to split scatterlists into chunks, each chunk being a
+ scatterlist. This should be selected by a driver or an API which
+ whishes to split a scatterlist amongst multiple DMA channel.
+
#
# sg chaining option
#
diff --git a/lib/Makefile b/lib/Makefile
index 6897b527581a..2ee6ea2e9b08 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -160,6 +160,7 @@ obj-$(CONFIG_GENERIC_STRNLEN_USER) += strnlen_user.o
obj-$(CONFIG_GENERIC_NET_UTILS) += net_utils.o
+obj-$(CONFIG_SG_SPLIT) += sg_split.o
obj-$(CONFIG_STMP_DEVICE) += stmp_device.o
libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o \
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index d105a9f56878..bafa9933fa76 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -105,16 +105,12 @@ EXPORT_SYMBOL(sg_nents_for_len);
**/
struct scatterlist *sg_last(struct scatterlist *sgl, unsigned int nents)
{
-#ifndef CONFIG_ARCH_HAS_SG_CHAIN
- struct scatterlist *ret = &sgl[nents - 1];
-#else
struct scatterlist *sg, *ret = NULL;
unsigned int i;
for_each_sg(sgl, sg, nents, i)
ret = sg;
-#endif
#ifdef CONFIG_DEBUG_SG
BUG_ON(sgl[0].sg_magic != SG_MAGIC);
BUG_ON(!sg_is_last(ret));
diff --git a/lib/sg_split.c b/lib/sg_split.c
new file mode 100644
index 000000000000..b063410c3593
--- /dev/null
+++ b/lib/sg_split.c
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 2015 Robert Jarzmik <robert.jarzmik@free.fr>
+ *
+ * Scatterlist splitting helpers.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+
+struct sg_splitter {
+ struct scatterlist *in_sg0;
+ int nents;
+ off_t skip_sg0;
+ unsigned int length_last_sg;
+
+ struct scatterlist *out_sg;
+};
+
+static int sg_calculate_split(struct scatterlist *in, int nents, int nb_splits,
+ off_t skip, const size_t *sizes,
+ struct sg_splitter *splitters, bool mapped)
+{
+ int i;
+ unsigned int sglen;
+ size_t size = sizes[0], len;
+ struct sg_splitter *curr = splitters;
+ struct scatterlist *sg;
+
+ for (i = 0; i < nb_splits; i++) {
+ splitters[i].in_sg0 = NULL;
+ splitters[i].nents = 0;
+ }
+
+ for_each_sg(in, sg, nents, i) {
+ sglen = mapped ? sg_dma_len(sg) : sg->length;
+ if (skip > sglen) {
+ skip -= sglen;
+ continue;
+ }
+
+ len = min_t(size_t, size, sglen - skip);
+ if (!curr->in_sg0) {
+ curr->in_sg0 = sg;
+ curr->skip_sg0 = skip;
+ }
+ size -= len;
+ curr->nents++;
+ curr->length_last_sg = len;
+
+ while (!size && (skip + len < sglen) && (--nb_splits > 0)) {
+ curr++;
+ size = *(++sizes);
+ skip += len;
+ len = min_t(size_t, size, sglen - skip);
+
+ curr->in_sg0 = sg;
+ curr->skip_sg0 = skip;
+ curr->nents = 1;
+ curr->length_last_sg = len;
+ size -= len;
+ }
+ skip = 0;
+
+ if (!size && --nb_splits > 0) {
+ curr++;
+ size = *(++sizes);
+ }
+
+ if (!nb_splits)
+ break;
+ }
+
+ return (size || !splitters[0].in_sg0) ? -EINVAL : 0;
+}
+
+static void sg_split_phys(struct sg_splitter *splitters, const int nb_splits)
+{
+ int i, j;
+ struct scatterlist *in_sg, *out_sg;
+ struct sg_splitter *split;
+
+ for (i = 0, split = splitters; i < nb_splits; i++, split++) {
+ in_sg = split->in_sg0;
+ out_sg = split->out_sg;
+ for (j = 0; j < split->nents; j++, out_sg++) {
+ *out_sg = *in_sg;
+ if (!j) {
+ out_sg->offset += split->skip_sg0;
+ out_sg->length -= split->skip_sg0;
+ } else {
+ out_sg->offset = 0;
+ }
+ sg_dma_address(out_sg) = 0;
+ sg_dma_len(out_sg) = 0;
+ in_sg = sg_next(in_sg);
+ }
+ out_sg[-1].length = split->length_last_sg;
+ sg_mark_end(out_sg - 1);
+ }
+}
+
+static void sg_split_mapped(struct sg_splitter *splitters, const int nb_splits)
+{
+ int i, j;
+ struct scatterlist *in_sg, *out_sg;
+ struct sg_splitter *split;
+
+ for (i = 0, split = splitters; i < nb_splits; i++, split++) {
+ in_sg = split->in_sg0;
+ out_sg = split->out_sg;
+ for (j = 0; j < split->nents; j++, out_sg++) {
+ sg_dma_address(out_sg) = sg_dma_address(in_sg);
+ sg_dma_len(out_sg) = sg_dma_len(in_sg);
+ if (!j) {
+ sg_dma_address(out_sg) += split->skip_sg0;
+ sg_dma_len(out_sg) -= split->skip_sg0;
+ }
+ in_sg = sg_next(in_sg);
+ }
+ sg_dma_len(--out_sg) = split->length_last_sg;
+ }
+}
+
+/**
+ * sg_split - split a scatterlist into several scatterlists
+ * @in: the input sg list
+ * @in_mapped_nents: the result of a dma_map_sg(in, ...), or 0 if not mapped.
+ * @skip: the number of bytes to skip in the input sg list
+ * @nb_splits: the number of desired sg outputs
+ * @split_sizes: the respective size of each output sg list in bytes
+ * @out: an array where to store the allocated output sg lists
+ * @out_mapped_nents: the resulting sg lists mapped number of sg entries. Might
+ * be NULL if sglist not already mapped (in_mapped_nents = 0)
+ * @gfp_mask: the allocation flag
+ *
+ * This function splits the input sg list into nb_splits sg lists, which are
+ * allocated and stored into out.
+ * The @in is split into :
+ * - @out[0], which covers bytes [@skip .. @skip + @split_sizes[0] - 1] of @in
+ * - @out[1], which covers bytes [@skip + split_sizes[0] ..
+ * @skip + @split_sizes[0] + @split_sizes[1] -1]
+ * etc ...
+ * It will be the caller's duty to kfree() out array members.
+ *
+ * Returns 0 upon success, or error code
+ */
+int sg_split(struct scatterlist *in, const int in_mapped_nents,
+ const off_t skip, const int nb_splits,
+ const size_t *split_sizes,
+ struct scatterlist **out, int *out_mapped_nents,
+ gfp_t gfp_mask)
+{
+ int i, ret;
+ struct sg_splitter *splitters;
+
+ splitters = kcalloc(nb_splits, sizeof(*splitters), gfp_mask);
+ if (!splitters)
+ return -ENOMEM;
+
+ ret = sg_calculate_split(in, sg_nents(in), nb_splits, skip, split_sizes,
+ splitters, false);
+ if (ret < 0)
+ goto err;
+
+ ret = -ENOMEM;
+ for (i = 0; i < nb_splits; i++) {
+ splitters[i].out_sg = kmalloc_array(splitters[i].nents,
+ sizeof(struct scatterlist),
+ gfp_mask);
+ if (!splitters[i].out_sg)
+ goto err;
+ }
+
+ /*
+ * The order of these 3 calls is important and should be kept.
+ */
+ sg_split_phys(splitters, nb_splits);
+ ret = sg_calculate_split(in, in_mapped_nents, nb_splits, skip,
+ split_sizes, splitters, true);
+ if (ret < 0)
+ goto err;
+ sg_split_mapped(splitters, nb_splits);
+
+ for (i = 0; i < nb_splits; i++) {
+ out[i] = splitters[i].out_sg;
+ if (out_mapped_nents)
+ out_mapped_nents[i] = splitters[i].nents;
+ }
+
+ kfree(splitters);
+ return 0;
+
+err:
+ for (i = 0; i < nb_splits; i++)
+ kfree(splitters[i].out_sg);
+ kfree(splitters);
+ return ret;
+}
+EXPORT_SYMBOL(sg_split);