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crypto: caam - chaining support 

support chained scatterlists for aead, ablkcipher and ahash.

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

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

Signed-off-by: Kudupudi Ugendreshwar <B38865@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
hifive-unleashed-5.1
Yuan Kang 2012-06-22 19:48:49 -05:00 committed by Herbert Xu
parent b0e09bae37
commit 643b39b031
3 changed files with 147 additions and 64 deletions
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114
drivers/crypto/caam/caamalg.c
View File

@ -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);
}

53
drivers/crypto/caam/caamhash.c
View File

@ -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;

44
drivers/crypto/caam/sg_sw_sec4.h
View File

@ -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)
{