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Commit a29af939 authored by Cyrille Pitchen's avatar Cyrille Pitchen Committed by Herbert Xu
Browse files

crypto: atmel-sha - update request queue management to make it more generic 



This patch is a transitional patch. It splits the atmel_sha_handle_queue()
function. Now atmel_sha_handle_queue() only manages the request queue and
calls a new .start() hook from the atmel_sha_ctx structure.
This hook allows to implement different kind of requests still handled by
a single queue.

Also when the req parameter of atmel_sha_handle_queue() refers to the very
same request as the one returned by crypto_dequeue_request(), the queue
management now gives a chance to this crypto request to be handled
synchronously, hence reducing latencies. The .start() hook returns 0 if
the crypto request was handled synchronously and -EINPROGRESS if the
crypto request still need to be handled asynchronously.

Besides, the new .is_async member of the atmel_sha_dev structure helps
tagging this asynchronous state. Indeed, the req->base.complete() callback
should not be called if the crypto request is handled synchronously.

Signed-off-by: default avatarCyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 8340c7fd

drivers/crypto/atmel-sha.c

+54 −20
Original line number Diff line number Diff line
@@ -105,8 +105,11 @@ struct atmel_sha_reqctx { 
	u8 buffer[SHA_BUFFER_LEN + SHA512_BLOCK_SIZE] __aligned(sizeof(u32));

};



typedef int (*atmel_sha_fn_t)(struct atmel_sha_dev *);



struct atmel_sha_ctx {

	struct atmel_sha_dev	*dd;

	atmel_sha_fn_t		start;



	unsigned long		flags;

};
@@ -134,6 +137,7 @@ struct atmel_sha_dev { 
	unsigned long		flags;

	struct crypto_queue	queue;

	struct ahash_request	*req;

	bool			is_async;



	struct atmel_sha_dma	dma_lch_in;
@@ -163,6 +167,24 @@ static inline void atmel_sha_write(struct atmel_sha_dev *dd, 
	writel_relaxed(value, dd->io_base + offset);

}



static inline int atmel_sha_complete(struct atmel_sha_dev *dd, int err)

{

	struct ahash_request *req = dd->req;



	dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |

		       SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY);



	clk_disable(dd->iclk);



	if (dd->is_async && req->base.complete)

		req->base.complete(&req->base, err);



	/* handle new request */

	tasklet_schedule(&dd->queue_task);



	return err;

}



static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)

{

	size_t count;
@@ -474,6 +496,8 @@ static void atmel_sha_dma_callback(void *data) 
{

	struct atmel_sha_dev *dd = data;



	dd->is_async = true;



	/* dma_lch_in - completed - wait DATRDY */

	atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);

}
@@ -509,7 +533,7 @@ static int atmel_sha_xmit_dma(struct atmel_sha_dev *dd, dma_addr_t dma_addr1, 
			DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);

	}

	if (!in_desc)

		return -EINVAL;

		atmel_sha_complete(dd, -EINVAL);



	in_desc->callback = atmel_sha_dma_callback;

	in_desc->callback_param = dd;
@@ -566,7 +590,7 @@ static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd, 
	if (dma_mapping_error(dd->dev, ctx->dma_addr)) {

		dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen +

				ctx->block_size);

		return -EINVAL;

		atmel_sha_complete(dd, -EINVAL);

	}



	ctx->flags &= ~SHA_FLAGS_SG;
@@ -657,7 +681,7 @@ static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd) 
		if (dma_mapping_error(dd->dev, ctx->dma_addr)) {

			dev_err(dd->dev, "dma %u bytes error\n",

				ctx->buflen + ctx->block_size);

			return -EINVAL;

			atmel_sha_complete(dd, -EINVAL);

		}



		if (length == 0) {
@@ -671,7 +695,7 @@ static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd) 
			if (!dma_map_sg(dd->dev, ctx->sg, 1,

				DMA_TO_DEVICE)) {

					dev_err(dd->dev, "dma_map_sg  error\n");

					return -EINVAL;

					atmel_sha_complete(dd, -EINVAL);

			}



			ctx->flags |= SHA_FLAGS_SG;
@@ -685,7 +709,7 @@ static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd) 


	if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {

		dev_err(dd->dev, "dma_map_sg  error\n");

		return -EINVAL;

		atmel_sha_complete(dd, -EINVAL);

	}



	ctx->flags |= SHA_FLAGS_SG;
@@ -843,16 +867,7 @@ static void atmel_sha_finish_req(struct ahash_request *req, int err) 
	}



	/* atomic operation is not needed here */

	dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |

			SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY);



	clk_disable(dd->iclk);



	if (req->base.complete)

		req->base.complete(&req->base, err);



	/* handle new request */

	tasklet_schedule(&dd->queue_task);

	(void)atmel_sha_complete(dd, err);

}



static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
@@ -893,8 +908,9 @@ static int atmel_sha_handle_queue(struct atmel_sha_dev *dd, 
				  struct ahash_request *req)

{

	struct crypto_async_request *async_req, *backlog;

	struct atmel_sha_reqctx *ctx;

	struct atmel_sha_ctx *ctx;

	unsigned long flags;

	bool start_async;

	int err = 0, ret = 0;



	spin_lock_irqsave(&dd->lock, flags);
@@ -919,9 +935,22 @@ static int atmel_sha_handle_queue(struct atmel_sha_dev *dd, 
	if (backlog)

		backlog->complete(backlog, -EINPROGRESS);



	req = ahash_request_cast(async_req);

	dd->req = req;

	ctx = ahash_request_ctx(req);

	ctx = crypto_tfm_ctx(async_req->tfm);



	dd->req = ahash_request_cast(async_req);

	start_async = (dd->req != req);

	dd->is_async = start_async;



	/* WARNING: ctx->start() MAY change dd->is_async. */

	err = ctx->start(dd);

	return (start_async) ? ret : err;

}



static int atmel_sha_start(struct atmel_sha_dev *dd)

{

	struct ahash_request *req = dd->req;

	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);

	int err;



	dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",

						ctx->op, req->nbytes);
@@ -947,7 +976,7 @@ static int atmel_sha_handle_queue(struct atmel_sha_dev *dd, 


	dev_dbg(dd->dev, "exit, err: %d\n", err);



	return ret;

	return err;

}



static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op)
@@ -1043,8 +1072,11 @@ static int atmel_sha_import(struct ahash_request *req, const void *in) 


static int atmel_sha_cra_init(struct crypto_tfm *tfm)

{

	struct atmel_sha_ctx *ctx = crypto_tfm_ctx(tfm);



	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),

				 sizeof(struct atmel_sha_reqctx));

	ctx->start = atmel_sha_start;



	return 0;

}
@@ -1188,6 +1220,8 @@ static void atmel_sha_done_task(unsigned long data) 
	struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;

	int err = 0;



	dd->is_async = true;



	if (SHA_FLAGS_CPU & dd->flags) {

		if (SHA_FLAGS_OUTPUT_READY & dd->flags) {

			dd->flags &= ~SHA_FLAGS_OUTPUT_READY;