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Commit 3c0dd190 authored by LEROY Christophe's avatar LEROY Christophe Committed by Herbert Xu
Browse files

crypto: talitos - avoid useless copy 



This patch avoids copy of buffered data to hash from bufnext to buf

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 37b5e889

drivers/crypto/talitos.c

+22 −14
Original line number Diff line number Diff line
@@ -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);

}