Commit 643b39b0 authored by Yuan Kang's avatar Yuan Kang Committed by Herbert Xu
Browse files

crypto: caam - chaining support 



support chained scatterlists for aead, ablkcipher and ahash.

Signed-off-by: default avatarYuan Kang <Yuan.Kang@freescale.com>

- fix dma unmap leak
- un-unlikely src == dst, due to experience with AF_ALG

Signed-off-by: default avatarKudupudi Ugendreshwar <B38865@freescale.com>
Signed-off-by: default avatarKim Phillips <kim.phillips@freescale.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent b0e09bae

drivers/crypto/caam/caamalg.c

+70 −44
Original line number Diff line number Diff line
@@ -654,8 +654,11 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher, 
/*

 * aead_edesc - s/w-extended aead descriptor

 * @assoc_nents: number of segments in associated data (SPI+Seq) scatterlist

 * @assoc_chained: if source is chained

 * @src_nents: number of segments in input scatterlist

 * @src_chained: if source is chained

 * @dst_nents: number of segments in output scatterlist

 * @dst_chained: if destination is chained

 * @iv_dma: dma address of iv for checking continuity and link table

 * @desc: h/w descriptor (variable length; must not exceed MAX_CAAM_DESCSIZE)

 * @sec4_sg_bytes: length of dma mapped sec4_sg space
@@ -664,8 +667,11 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher, 
 */

struct aead_edesc {

	int assoc_nents;

	bool assoc_chained;

	int src_nents;

	bool src_chained;

	int dst_nents;

	bool dst_chained;

	dma_addr_t iv_dma;

	int sec4_sg_bytes;

	dma_addr_t sec4_sg_dma;
@@ -676,7 +682,9 @@ struct aead_edesc { 
/*

 * ablkcipher_edesc - s/w-extended ablkcipher descriptor

 * @src_nents: number of segments in input scatterlist

 * @src_chained: if source is chained

 * @dst_nents: number of segments in output scatterlist

 * @dst_chained: if destination is chained

 * @iv_dma: dma address of iv for checking continuity and link table

 * @desc: h/w descriptor (variable length; must not exceed MAX_CAAM_DESCSIZE)

 * @sec4_sg_bytes: length of dma mapped sec4_sg space
@@ -685,7 +693,9 @@ struct aead_edesc { 
 */

struct ablkcipher_edesc {

	int src_nents;

	bool src_chained;

	int dst_nents;

	bool dst_chained;

	dma_addr_t iv_dma;

	int sec4_sg_bytes;

	dma_addr_t sec4_sg_dma;
@@ -694,15 +704,19 @@ struct ablkcipher_edesc { 
};



static void caam_unmap(struct device *dev, struct scatterlist *src,

		       struct scatterlist *dst, int src_nents, int dst_nents,

		       struct scatterlist *dst, int src_nents,

		       bool src_chained, int dst_nents, bool dst_chained,

		       dma_addr_t iv_dma, int ivsize, dma_addr_t sec4_sg_dma,

		       int sec4_sg_bytes)

{

	if (unlikely(dst != src)) {

		dma_unmap_sg(dev, src, src_nents, DMA_TO_DEVICE);

		dma_unmap_sg(dev, dst, dst_nents, DMA_FROM_DEVICE);

	if (dst != src) {

		dma_unmap_sg_chained(dev, src, src_nents ? : 1, DMA_TO_DEVICE,

				     src_chained);

		dma_unmap_sg_chained(dev, dst, dst_nents ? : 1, DMA_FROM_DEVICE,

				     dst_chained);

	} else {

		dma_unmap_sg(dev, src, src_nents, DMA_BIDIRECTIONAL);

		dma_unmap_sg_chained(dev, src, src_nents ? : 1,

				     DMA_BIDIRECTIONAL, src_chained);

	}



	if (iv_dma)
@@ -719,12 +733,13 @@ static void aead_unmap(struct device *dev, 
	struct crypto_aead *aead = crypto_aead_reqtfm(req);

	int ivsize = crypto_aead_ivsize(aead);



	dma_unmap_sg(dev, req->assoc, edesc->assoc_nents, DMA_TO_DEVICE);

	dma_unmap_sg_chained(dev, req->assoc, edesc->assoc_nents,

			     DMA_TO_DEVICE, edesc->assoc_chained);



	caam_unmap(dev, req->src, req->dst,

		   edesc->src_nents, edesc->dst_nents,

		   edesc->iv_dma, ivsize, edesc->sec4_sg_dma,

		   edesc->sec4_sg_bytes);

		   edesc->src_nents, edesc->src_chained, edesc->dst_nents,

		   edesc->dst_chained, edesc->iv_dma, ivsize,

		   edesc->sec4_sg_dma, edesc->sec4_sg_bytes);

}



static void ablkcipher_unmap(struct device *dev,
@@ -735,9 +750,9 @@ static void ablkcipher_unmap(struct device *dev, 
	int ivsize = crypto_ablkcipher_ivsize(ablkcipher);



	caam_unmap(dev, req->src, req->dst,

		   edesc->src_nents, edesc->dst_nents,

		   edesc->iv_dma, ivsize, edesc->sec4_sg_dma,

		   edesc->sec4_sg_bytes);

		   edesc->src_nents, edesc->src_chained, edesc->dst_nents,

		   edesc->dst_chained, edesc->iv_dma, ivsize,

		   edesc->sec4_sg_dma, edesc->sec4_sg_bytes);

}



static void aead_encrypt_done(struct device *jrdev, u32 *desc, u32 err,
@@ -1128,25 +1143,26 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req, 
	dma_addr_t iv_dma = 0;

	int sgc;

	bool all_contig = true;

	bool assoc_chained = false, src_chained = false, dst_chained = false;

	int ivsize = crypto_aead_ivsize(aead);

	int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;



	assoc_nents = sg_count(req->assoc, req->assoclen);

	src_nents = sg_count(req->src, req->cryptlen);

	assoc_nents = sg_count(req->assoc, req->assoclen, &assoc_chained);

	src_nents = sg_count(req->src, req->cryptlen, &src_chained);



	if (unlikely(req->dst != req->src))

		dst_nents = sg_count(req->dst, req->cryptlen);

		dst_nents = sg_count(req->dst, req->cryptlen, &dst_chained);



	sgc = dma_map_sg(jrdev, req->assoc, assoc_nents ? : 1,

			 DMA_BIDIRECTIONAL);

	sgc = dma_map_sg_chained(jrdev, req->assoc, assoc_nents ? : 1,

				 DMA_BIDIRECTIONAL, assoc_chained);

	if (likely(req->src == req->dst)) {

		sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,

				 DMA_BIDIRECTIONAL);

		sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,

					 DMA_BIDIRECTIONAL, src_chained);

	} else {

		sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,

				 DMA_TO_DEVICE);

		sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1,

				 DMA_FROM_DEVICE);

		sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,

					 DMA_TO_DEVICE, src_chained);

		sgc = dma_map_sg_chained(jrdev, req->dst, dst_nents ? : 1,

					 DMA_FROM_DEVICE, dst_chained);

	}



	/* Check if data are contiguous */
@@ -1172,8 +1188,11 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req, 
	}



	edesc->assoc_nents = assoc_nents;

	edesc->assoc_chained = assoc_chained;

	edesc->src_nents = src_nents;

	edesc->src_chained = src_chained;

	edesc->dst_nents = dst_nents;

	edesc->dst_chained = dst_chained;

	edesc->iv_dma = iv_dma;

	edesc->sec4_sg_bytes = sec4_sg_bytes;

	edesc->sec4_sg = (void *)edesc + sizeof(struct aead_edesc) +
@@ -1307,24 +1326,25 @@ static struct aead_edesc *aead_giv_edesc_alloc(struct aead_givcrypt_request 
	int sgc;

	u32 contig = GIV_SRC_CONTIG | GIV_DST_CONTIG;

	int ivsize = crypto_aead_ivsize(aead);

	bool assoc_chained = false, src_chained = false, dst_chained = false;

	int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;



	assoc_nents = sg_count(req->assoc, req->assoclen);

	src_nents = sg_count(req->src, req->cryptlen);

	assoc_nents = sg_count(req->assoc, req->assoclen, &assoc_chained);

	src_nents = sg_count(req->src, req->cryptlen, &src_chained);



	if (unlikely(req->dst != req->src))

		dst_nents = sg_count(req->dst, req->cryptlen);

		dst_nents = sg_count(req->dst, req->cryptlen, &dst_chained);



	sgc = dma_map_sg(jrdev, req->assoc, assoc_nents ? : 1,

			 DMA_BIDIRECTIONAL);

	sgc = dma_map_sg_chained(jrdev, req->assoc, assoc_nents ? : 1,

				 DMA_BIDIRECTIONAL, assoc_chained);

	if (likely(req->src == req->dst)) {

		sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,

				 DMA_BIDIRECTIONAL);

		sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,

					 DMA_BIDIRECTIONAL, src_chained);

	} else {

		sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,

				 DMA_TO_DEVICE);

		sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1,

				 DMA_FROM_DEVICE);

		sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,

					 DMA_TO_DEVICE, src_chained);

		sgc = dma_map_sg_chained(jrdev, req->dst, dst_nents ? : 1,

					 DMA_FROM_DEVICE, dst_chained);

	}



	/* Check if data are contiguous */
@@ -1358,8 +1378,11 @@ static struct aead_edesc *aead_giv_edesc_alloc(struct aead_givcrypt_request 
	}



	edesc->assoc_nents = assoc_nents;

	edesc->assoc_chained = assoc_chained;

	edesc->src_nents = src_nents;

	edesc->src_chained = src_chained;

	edesc->dst_nents = dst_nents;

	edesc->dst_chained = dst_chained;

	edesc->iv_dma = iv_dma;

	edesc->sec4_sg_bytes = sec4_sg_bytes;

	edesc->sec4_sg = (void *)edesc + sizeof(struct aead_edesc) +
@@ -1459,21 +1482,22 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request 
	bool iv_contig = false;

	int sgc;

	int ivsize = crypto_ablkcipher_ivsize(ablkcipher);

	bool src_chained = false, dst_chained = false;

	int sec4_sg_index;



	src_nents = sg_count(req->src, req->nbytes);

	src_nents = sg_count(req->src, req->nbytes, &src_chained);



	if (unlikely(req->dst != req->src))

		dst_nents = sg_count(req->dst, req->nbytes);

	if (req->dst != req->src)

		dst_nents = sg_count(req->dst, req->nbytes, &dst_chained);



	if (likely(req->src == req->dst)) {

		sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,

				 DMA_BIDIRECTIONAL);

		sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,

					 DMA_BIDIRECTIONAL, src_chained);

	} else {

		sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,

				 DMA_TO_DEVICE);

		sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1,

				 DMA_FROM_DEVICE);

		sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,

					 DMA_TO_DEVICE, src_chained);

		sgc = dma_map_sg_chained(jrdev, req->dst, dst_nents ? : 1,

					 DMA_FROM_DEVICE, dst_chained);

	}



	/*
@@ -1497,7 +1521,9 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request 
	}



	edesc->src_nents = src_nents;

	edesc->src_chained = src_chained;

	edesc->dst_nents = dst_nents;

	edesc->dst_chained = dst_chained;

	edesc->sec4_sg_bytes = sec4_sg_bytes;

	edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) +

			 desc_bytes;
@@ -1510,7 +1536,7 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request 
		sec4_sg_index += 1 + src_nents;

	}



	if (unlikely(dst_nents)) {

	if (dst_nents) {

		sg_to_sec4_sg_last(req->dst, dst_nents,

			edesc->sec4_sg + sec4_sg_index, 0);

	}

drivers/crypto/caam/caamhash.c

+38 −15
Original line number Diff line number Diff line
@@ -175,9 +175,10 @@ static inline dma_addr_t buf_map_to_sec4_sg(struct device *jrdev, 
/* Map req->src and put it in link table */

static inline void src_map_to_sec4_sg(struct device *jrdev,

				      struct scatterlist *src, int src_nents,

				      struct sec4_sg_entry *sec4_sg)

				      struct sec4_sg_entry *sec4_sg,

				      bool chained)

{

	dma_map_sg(jrdev, src, src_nents, DMA_TO_DEVICE);

	dma_map_sg_chained(jrdev, src, src_nents, DMA_TO_DEVICE, chained);

	sg_to_sec4_sg_last(src, src_nents, sec4_sg, 0);

}
@@ -563,6 +564,7 @@ badkey: 
 * ahash_edesc - s/w-extended ahash descriptor

 * @dst_dma: physical mapped address of req->result

 * @sec4_sg_dma: physical mapped address of h/w link table

 * @chained: if source is chained

 * @src_nents: number of segments in input scatterlist

 * @sec4_sg_bytes: length of dma mapped sec4_sg space

 * @sec4_sg: pointer to h/w link table
@@ -571,6 +573,7 @@ badkey: 
struct ahash_edesc {

	dma_addr_t dst_dma;

	dma_addr_t sec4_sg_dma;

	bool chained;

	int src_nents;

	int sec4_sg_bytes;

	struct sec4_sg_entry *sec4_sg;
@@ -582,7 +585,8 @@ static inline void ahash_unmap(struct device *dev, 
			struct ahash_request *req, int dst_len)

{

	if (edesc->src_nents)

		dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);

		dma_unmap_sg_chained(dev, req->src, edesc->src_nents,

				     DMA_TO_DEVICE, edesc->chained);

	if (edesc->dst_dma)

		dma_unmap_single(dev, edesc->dst_dma, dst_len, DMA_FROM_DEVICE);
@@ -775,6 +779,7 @@ static int ahash_update_ctx(struct ahash_request *req) 
	dma_addr_t ptr = ctx->sh_desc_update_dma;

	int src_nents, sec4_sg_bytes, sec4_sg_src_index;

	struct ahash_edesc *edesc;

	bool chained = false;

	int ret = 0;

	int sh_len;
@@ -783,7 +788,8 @@ static int ahash_update_ctx(struct ahash_request *req) 
	to_hash = in_len - *next_buflen;



	if (to_hash) {

		src_nents = __sg_count(req->src, req->nbytes - (*next_buflen));

		src_nents = __sg_count(req->src, req->nbytes - (*next_buflen),

				       &chained);

		sec4_sg_src_index = 1 + (*buflen ? 1 : 0);

		sec4_sg_bytes = (sec4_sg_src_index + src_nents) *

				 sizeof(struct sec4_sg_entry);
@@ -801,6 +807,7 @@ static int ahash_update_ctx(struct ahash_request *req) 
		}



		edesc->src_nents = src_nents;

		edesc->chained = chained;

		edesc->sec4_sg_bytes = sec4_sg_bytes;

		edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) +

				 DESC_JOB_IO_LEN;
@@ -818,7 +825,8 @@ static int ahash_update_ctx(struct ahash_request *req) 


		if (src_nents) {

			src_map_to_sec4_sg(jrdev, req->src, src_nents,

					   edesc->sec4_sg + sec4_sg_src_index);

					   edesc->sec4_sg + sec4_sg_src_index,

					   chained);

			if (*next_buflen) {

				sg_copy_part(next_buf, req->src, to_hash -

					     *buflen, req->nbytes);
@@ -958,10 +966,11 @@ static int ahash_finup_ctx(struct ahash_request *req) 
	int src_nents;

	int digestsize = crypto_ahash_digestsize(ahash);

	struct ahash_edesc *edesc;

	bool chained = false;

	int ret = 0;

	int sh_len;



	src_nents = __sg_count(req->src, req->nbytes);

	src_nents = __sg_count(req->src, req->nbytes, &chained);

	sec4_sg_src_index = 1 + (buflen ? 1 : 0);

	sec4_sg_bytes = (sec4_sg_src_index + src_nents) *

			 sizeof(struct sec4_sg_entry);
@@ -979,6 +988,7 @@ static int ahash_finup_ctx(struct ahash_request *req) 
	init_job_desc_shared(desc, ptr, sh_len, HDR_SHARE_DEFER | HDR_REVERSE);



	edesc->src_nents = src_nents;

	edesc->chained = chained;

	edesc->sec4_sg_bytes = sec4_sg_bytes;

	edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) +

			 DESC_JOB_IO_LEN;
@@ -993,7 +1003,7 @@ static int ahash_finup_ctx(struct ahash_request *req) 
						last_buflen);



	src_map_to_sec4_sg(jrdev, req->src, src_nents, edesc->sec4_sg +

			   sec4_sg_src_index);

			   sec4_sg_src_index, chained);



	append_seq_in_ptr(desc, edesc->sec4_sg_dma, ctx->ctx_len +

			       buflen + req->nbytes, LDST_SGF);
@@ -1030,12 +1040,14 @@ static int ahash_digest(struct ahash_request *req) 
	int src_nents, sec4_sg_bytes;

	dma_addr_t src_dma;

	struct ahash_edesc *edesc;

	bool chained = false;

	int ret = 0;

	u32 options;

	int sh_len;



	src_nents = sg_count(req->src, req->nbytes);

	dma_map_sg(jrdev, req->src, src_nents ? : 1, DMA_TO_DEVICE);

	src_nents = sg_count(req->src, req->nbytes, &chained);

	dma_map_sg_chained(jrdev, req->src, src_nents ? : 1, DMA_TO_DEVICE,

			   chained);

	sec4_sg_bytes = src_nents * sizeof(struct sec4_sg_entry);



	/* allocate space for base edesc and hw desc commands, link tables */
@@ -1050,6 +1062,7 @@ static int ahash_digest(struct ahash_request *req) 
	edesc->sec4_sg_dma = dma_map_single(jrdev, edesc->sec4_sg,

					    sec4_sg_bytes, DMA_TO_DEVICE);

	edesc->src_nents = src_nents;

	edesc->chained = chained;



	sh_len = desc_len(sh_desc);

	desc = edesc->hw_desc;
@@ -1157,6 +1170,7 @@ static int ahash_update_no_ctx(struct ahash_request *req) 
	struct ahash_edesc *edesc;

	u32 *desc, *sh_desc = ctx->sh_desc_update_first;

	dma_addr_t ptr = ctx->sh_desc_update_first_dma;

	bool chained = false;

	int ret = 0;

	int sh_len;
@@ -1164,7 +1178,8 @@ static int ahash_update_no_ctx(struct ahash_request *req) 
	to_hash = in_len - *next_buflen;



	if (to_hash) {

		src_nents = __sg_count(req->src, req->nbytes - (*next_buflen));

		src_nents = __sg_count(req->src, req->nbytes - (*next_buflen),

				       &chained);

		sec4_sg_bytes = (1 + src_nents) *

				sizeof(struct sec4_sg_entry);
@@ -1181,6 +1196,7 @@ static int ahash_update_no_ctx(struct ahash_request *req) 
		}



		edesc->src_nents = src_nents;

		edesc->chained = chained;

		edesc->sec4_sg_bytes = sec4_sg_bytes;

		edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) +

				 DESC_JOB_IO_LEN;
@@ -1191,7 +1207,7 @@ static int ahash_update_no_ctx(struct ahash_request *req) 
		state->buf_dma = buf_map_to_sec4_sg(jrdev, edesc->sec4_sg,

						    buf, *buflen);

		src_map_to_sec4_sg(jrdev, req->src, src_nents,

				   edesc->sec4_sg + 1);

				   edesc->sec4_sg + 1, chained);

		if (*next_buflen) {

			sg_copy_part(next_buf, req->src, to_hash - *buflen,

				    req->nbytes);
@@ -1258,10 +1274,11 @@ static int ahash_finup_no_ctx(struct ahash_request *req) 
	int sec4_sg_bytes, sec4_sg_src_index, src_nents;

	int digestsize = crypto_ahash_digestsize(ahash);

	struct ahash_edesc *edesc;

	bool chained = false;

	int sh_len;

	int ret = 0;



	src_nents = __sg_count(req->src, req->nbytes);

	src_nents = __sg_count(req->src, req->nbytes, &chained);

	sec4_sg_src_index = 2;

	sec4_sg_bytes = (sec4_sg_src_index + src_nents) *

			 sizeof(struct sec4_sg_entry);
@@ -1279,6 +1296,7 @@ static int ahash_finup_no_ctx(struct ahash_request *req) 
	init_job_desc_shared(desc, ptr, sh_len, HDR_SHARE_DEFER | HDR_REVERSE);



	edesc->src_nents = src_nents;

	edesc->chained = chained;

	edesc->sec4_sg_bytes = sec4_sg_bytes;

	edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) +

			 DESC_JOB_IO_LEN;
@@ -1289,7 +1307,8 @@ static int ahash_finup_no_ctx(struct ahash_request *req) 
						state->buf_dma, buflen,

						last_buflen);



	src_map_to_sec4_sg(jrdev, req->src, src_nents, edesc->sec4_sg + 1);

	src_map_to_sec4_sg(jrdev, req->src, src_nents, edesc->sec4_sg + 1,

			   chained);



	append_seq_in_ptr(desc, edesc->sec4_sg_dma, buflen +

			       req->nbytes, LDST_SGF);
@@ -1332,6 +1351,7 @@ static int ahash_update_first(struct ahash_request *req) 
	dma_addr_t src_dma;

	u32 options;

	struct ahash_edesc *edesc;

	bool chained = false;

	int ret = 0;

	int sh_len;
@@ -1340,8 +1360,10 @@ static int ahash_update_first(struct ahash_request *req) 
	to_hash = req->nbytes - *next_buflen;



	if (to_hash) {

		src_nents = sg_count(req->src, req->nbytes - (*next_buflen));

		dma_map_sg(jrdev, req->src, src_nents ? : 1, DMA_TO_DEVICE);

		src_nents = sg_count(req->src, req->nbytes - (*next_buflen),

				     &chained);

		dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,

				   DMA_TO_DEVICE, chained);

		sec4_sg_bytes = src_nents * sizeof(struct sec4_sg_entry);



		/*
@@ -1357,6 +1379,7 @@ static int ahash_update_first(struct ahash_request *req) 
		}



		edesc->src_nents = src_nents;

		edesc->chained = chained;

		edesc->sec4_sg_bytes = sec4_sg_bytes;

		edesc->sec4_sg = (void *)edesc + sizeof(struct ahash_edesc) +

				 DESC_JOB_IO_LEN;

drivers/crypto/caam/sg_sw_sec4.h

+39 −5
Original line number Diff line number Diff line
@@ -37,7 +37,7 @@ sg_to_sec4_sg(struct scatterlist *sg, int sg_count, 
		dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg),

				   sg_dma_len(sg), offset);

		sec4_sg_ptr++;

		sg = sg_next(sg);

		sg = scatterwalk_sg_next(sg);

		sg_count--;

	}

	return sec4_sg_ptr - 1;
@@ -56,7 +56,8 @@ static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int sg_count, 
}



/* count number of elements in scatterlist */

static inline int __sg_count(struct scatterlist *sg_list, int nbytes)

static inline int __sg_count(struct scatterlist *sg_list, int nbytes,

			     bool *chained)

{

	struct scatterlist *sg = sg_list;

	int sg_nents = 0;
@@ -65,7 +66,7 @@ static inline int __sg_count(struct scatterlist *sg_list, int nbytes) 
		sg_nents++;

		nbytes -= sg->length;

		if (!sg_is_last(sg) && (sg + 1)->length == 0)

			BUG(); /* Not support chaining */

			*chained = true;

		sg = scatterwalk_sg_next(sg);

	}
@@ -73,9 +74,10 @@ static inline int __sg_count(struct scatterlist *sg_list, int nbytes) 
}



/* derive number of elements in scatterlist, but return 0 for 1 */

static inline int sg_count(struct scatterlist *sg_list, int nbytes)

static inline int sg_count(struct scatterlist *sg_list, int nbytes,

			     bool *chained)

{

	int sg_nents = __sg_count(sg_list, nbytes);

	int sg_nents = __sg_count(sg_list, nbytes, chained);



	if (likely(sg_nents == 1))

		return 0;
@@ -83,6 +85,38 @@ static inline int sg_count(struct scatterlist *sg_list, int nbytes) 
	return sg_nents;

}



static int dma_map_sg_chained(struct device *dev, struct scatterlist *sg,

			      unsigned int nents, enum dma_data_direction dir,

			      bool chained)

{

	if (unlikely(chained)) {

		int i;

		for (i = 0; i < nents; i++) {

			dma_map_sg(dev, sg, 1, dir);

			sg = scatterwalk_sg_next(sg);

		}

	} else {

		dma_map_sg(dev, sg, nents, dir);

	}

	return nents;

}



static int dma_unmap_sg_chained(struct device *dev, struct scatterlist *sg,

				unsigned int nents, enum dma_data_direction dir,

				bool chained)

{

	if (unlikely(chained)) {

		int i;

		for (i = 0; i < nents; i++) {

			dma_unmap_sg(dev, sg, 1, dir);

			sg = scatterwalk_sg_next(sg);

		}

	} else {

		dma_unmap_sg(dev, sg, nents, dir);

	}

	return nents;

}



/* Copy from len bytes of sg to dest, starting from beginning */

static inline void sg_copy(u8 *dest, struct scatterlist *sg, unsigned int len)

{

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