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Subject[PATCH 18/18] crypto: talitos - avoid useless copy
Date
This patch avoids copy of buffered data to hash from bufnext to buf

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
drivers/crypto/talitos.c | 36 ++++++++++++++++++++++--------------
1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 5c4499a85611..5bd8191405d8 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -842,8 +842,8 @@ struct talitos_ctx {
struct talitos_ahash_req_ctx {
u32 hw_context[TALITOS_MDEU_MAX_CONTEXT_SIZE / sizeof(u32)];
unsigned int hw_context_size;
- u8 buf[HASH_MAX_BLOCK_SIZE];
- u8 bufnext[HASH_MAX_BLOCK_SIZE];
+ u8 buf[2][HASH_MAX_BLOCK_SIZE];
+ int buf_idx;
unsigned int swinit;
unsigned int first;
unsigned int last;
@@ -1709,7 +1709,7 @@ static void ahash_done(struct device *dev,

if (!req_ctx->last && req_ctx->to_hash_later) {
/* Position any partial block for next update/final/finup */
- memcpy(req_ctx->buf, req_ctx->bufnext, req_ctx->to_hash_later);
+ req_ctx->buf_idx = (req_ctx->buf_idx + 1) & 1;
req_ctx->nbuf = req_ctx->to_hash_later;
}
common_nonsnoop_hash_unmap(dev, edesc, areq);
@@ -1789,8 +1789,10 @@ static int common_nonsnoop_hash(struct talitos_edesc *edesc,
* data in
*/
if (is_sec1 && req_ctx->nbuf) {
- to_talitos_ptr(&desc->ptr[3], ctx->dma_buf, req_ctx->nbuf,
- is_sec1);
+ dma_addr_t dma_buf = ctx->dma_buf + req_ctx->buf_idx *
+ HASH_MAX_BLOCK_SIZE;
+
+ to_talitos_ptr(&desc->ptr[3], dma_buf, req_ctx->nbuf, is_sec1);
} else {
sg_count = talitos_sg_map(dev, req_ctx->psrc, length, edesc,
&desc->ptr[3], sg_count, offset, 0);
@@ -1883,6 +1885,7 @@ static int ahash_init(struct ahash_request *areq)
bool is_sec1 = has_ftr_sec1(priv);

/* Initialize the context */
+ req_ctx->buf_idx = 0;
req_ctx->nbuf = 0;
req_ctx->first = 1; /* first indicates h/w must init its context */
req_ctx->swinit = 0; /* assume h/w init of context */
@@ -1955,6 +1958,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
int offset = 0;
+ u8 *ctx_buf = req_ctx->buf[req_ctx->buf_idx];

if (!req_ctx->last && (nbytes + req_ctx->nbuf <= blocksize)) {
/* Buffer up to one whole block */
@@ -1964,7 +1968,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
return nents;
}
sg_copy_to_buffer(areq->src, nents,
- req_ctx->buf + req_ctx->nbuf, nbytes);
+ ctx_buf + req_ctx->nbuf, nbytes);
req_ctx->nbuf += nbytes;
return 0;
}
@@ -1988,7 +1992,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
if (!is_sec1 && req_ctx->nbuf) {
nsg = (req_ctx->nbuf < nbytes_to_hash) ? 2 : 1;
sg_init_table(req_ctx->bufsl, nsg);
- sg_set_buf(req_ctx->bufsl, req_ctx->buf, req_ctx->nbuf);
+ sg_set_buf(req_ctx->bufsl, ctx_buf, req_ctx->nbuf);
if (nsg > 1)
sg_chain(req_ctx->bufsl, 2, areq->src);
req_ctx->psrc = req_ctx->bufsl;
@@ -2003,7 +2007,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
return nents;
}
sg_copy_to_buffer(areq->src, nents,
- req_ctx->buf + req_ctx->nbuf, offset);
+ ctx_buf + req_ctx->nbuf, offset);
req_ctx->nbuf += offset;
req_ctx->psrc = areq->src;
} else
@@ -2016,7 +2020,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
return nents;
}
sg_pcopy_to_buffer(areq->src, nents,
- req_ctx->bufnext,
+ req_ctx->buf[(req_ctx->buf_idx + 1) & 1],
to_hash_later,
nbytes - to_hash_later);
}
@@ -2038,9 +2042,13 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
/* request SEC to INIT hash. */
if (req_ctx->first && !req_ctx->swinit)
edesc->desc.hdr |= DESC_HDR_MODE0_MDEU_INIT;
- if (is_sec1)
- dma_sync_single_for_device(dev, ctx->dma_buf,
+ if (is_sec1) {
+ dma_addr_t dma_buf = ctx->dma_buf + req_ctx->buf_idx *
+ HASH_MAX_BLOCK_SIZE;
+
+ dma_sync_single_for_device(dev, dma_buf,
req_ctx->nbuf, DMA_TO_DEVICE);
+ }

/* When the tfm context has a keylen, it's an HMAC.
* A first or last (ie. not middle) descriptor must request HMAC.
@@ -2102,7 +2110,7 @@ static int ahash_export(struct ahash_request *areq, void *out)
req_ctx->hw_context_size, DMA_FROM_DEVICE);
memcpy(export->hw_context, req_ctx->hw_context,
req_ctx->hw_context_size);
- memcpy(export->buf, req_ctx->buf, req_ctx->nbuf);
+ memcpy(export->buf, req_ctx->buf[req_ctx->buf_idx], req_ctx->nbuf);
export->swinit = req_ctx->swinit;
export->first = req_ctx->first;
export->last = req_ctx->last;
@@ -2138,7 +2146,7 @@ static int ahash_import(struct ahash_request *areq, const void *in)
if (ctx->dma_buf)
dma_unmap_single(dev, ctx->dma_buf, sizeof(req_ctx->buf),
DMA_TO_DEVICE);
- memcpy(req_ctx->buf, export->buf, export->nbuf);
+ memcpy(req_ctx->buf[0], export->buf, export->nbuf);
if (is_sec1)
ctx->dma_buf = dma_map_single(dev, req_ctx->buf,
sizeof(req_ctx->buf),
@@ -3097,7 +3105,7 @@ static void talitos_cra_exit_ahash(struct crypto_tfm *tfm)
dma_unmap_single(dev, ctx->dma_hw_context, size,
DMA_BIDIRECTIONAL);
if (ctx->dma_buf)
- dma_unmap_single(dev, ctx->dma_buf, HASH_MAX_BLOCK_SIZE,
+ dma_unmap_single(dev, ctx->dma_buf, HASH_MAX_BLOCK_SIZE * 2,
DMA_TO_DEVICE);
}

--
2.13.3
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