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Commit 798eed5d authored by Dmitry Kasatkin's avatar Dmitry Kasatkin Committed by Herbert Xu
Browse files

crypto: omap-sham - crypto_ahash_final() now not need to be called. 



According to the Herbert Xu, client may not always call
crypto_ahash_final().

In the case of error in hash calculation resources will be
automatically cleaned up.

But if no hash calculation error happens and client will not call
crypto_ahash_final() at all, then internal buffer will not be freed,
and clocks will not be disabled.

This patch provides support for atomic crypto_ahash_update() call.
Clocks are now enabled and disabled per update request.

Data buffer is now allocated as a part of request context.
Client is obligated to free it with crypto_free_ahash().

Signed-off-by: default avatarDmitry Kasatkin <dmitry.kasatkin@nokia.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent a5d87237

drivers/crypto/omap-sham.c

+82 −86
Original line number Diff line number Diff line
@@ -89,6 +89,11 @@ 
#define OP_UPDATE	1

#define OP_FINAL	2



#define OMAP_ALIGN_MASK		(sizeof(u32)-1)

#define OMAP_ALIGNED		__attribute__((aligned(sizeof(u32))))



#define BUFLEN		PAGE_SIZE



struct omap_sham_dev;



struct omap_sham_reqctx {
@@ -96,9 +101,8 @@ struct omap_sham_reqctx { 
	unsigned long		flags;

	unsigned long		op;



	u8			digest[SHA1_DIGEST_SIZE];

	u8			digest[SHA1_DIGEST_SIZE] OMAP_ALIGNED;

	size_t			digcnt;

	u8			*buffer;

	size_t			bufcnt;

	size_t			buflen;

	dma_addr_t		dma_addr;
@@ -107,6 +111,8 @@ struct omap_sham_reqctx { 
	struct scatterlist	*sg;

	unsigned int		offset;	/* offset in current sg */

	unsigned int		total;	/* total request */



	u8			buffer[0] OMAP_ALIGNED;

};



struct omap_sham_hmac_ctx {
@@ -219,14 +225,8 @@ static void omap_sham_copy_hash(struct ahash_request *req, int out) 
	}

}



static int omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length,

				 int final, int dma)

static int omap_sham_hw_init(struct omap_sham_dev *dd)

{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);

	u32 val = length << 5, mask;



	if (unlikely(!ctx->digcnt)) {



	clk_enable(dd->iclk);



	if (!(dd->flags & FLAGS_INIT)) {
@@ -234,17 +234,25 @@ static int omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length, 
			SHA_REG_MASK_SOFTRESET, SHA_REG_MASK_SOFTRESET);



		if (omap_sham_wait(dd, SHA_REG_SYSSTATUS,

						SHA_REG_SYSSTATUS_RESETDONE)) {

				clk_disable(dd->iclk);

					SHA_REG_SYSSTATUS_RESETDONE))

			return -ETIMEDOUT;

			}



		dd->flags |= FLAGS_INIT;

		dd->err = 0;

	}

	} else {

		omap_sham_write(dd, SHA_REG_DIGCNT, ctx->digcnt);



	return 0;

}



static void omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length,

				 int final, int dma)

{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);

	u32 val = length << 5, mask;



	if (likely(ctx->digcnt))

		omap_sham_write(dd, SHA_REG_DIGCNT, ctx->digcnt);



	omap_sham_write_mask(dd, SHA_REG_MASK,

		SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),

		SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
@@ -263,23 +271,19 @@ static int omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length, 
			SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;



	omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);



	return 0;

}



static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, const u8 *buf,

			      size_t length, int final)

{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);

	int err, count, len32;

	int count, len32;

	const u32 *buffer = (const u32 *)buf;



	dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n",

						ctx->digcnt, length, final);



	err = omap_sham_write_ctrl(dd, length, final, 0);

	if (err)

		return err;

	omap_sham_write_ctrl(dd, length, final, 0);



	/* should be non-zero before next lines to disable clocks later */

	ctx->digcnt += length;
@@ -302,14 +306,10 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr, 
			      size_t length, int final)

{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);

	int err, len32;

	int len32;



	dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",

						ctx->digcnt, length, final);

	/* flush cache entries related to our page */

	if (dma_addr == ctx->dma_addr)

		dma_sync_single_for_device(dd->dev, dma_addr, length,

					   DMA_TO_DEVICE);



	len32 = DIV_ROUND_UP(length, sizeof(u32));
@@ -320,19 +320,7 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr, 
	omap_set_dma_src_params(dd->dma_lch, 0, OMAP_DMA_AMODE_POST_INC,

				dma_addr, 0, 0);



	omap_set_dma_dest_params(dd->dma_lch, 0,

			OMAP_DMA_AMODE_CONSTANT,

			dd->phys_base + SHA_REG_DIN(0), 0, 16);



	omap_set_dma_dest_burst_mode(dd->dma_lch,

			OMAP_DMA_DATA_BURST_16);



	omap_set_dma_src_burst_mode(dd->dma_lch,

			OMAP_DMA_DATA_BURST_4);



	err = omap_sham_write_ctrl(dd, length, final, 1);

	if (err)

		return err;

	omap_sham_write_ctrl(dd, length, final, 1);



	ctx->digcnt += length;
@@ -384,6 +372,21 @@ static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx) 
	return 0;

}



static int omap_sham_xmit_dma_map(struct omap_sham_dev *dd,

					struct omap_sham_reqctx *ctx,

					size_t length, int final)

{

	ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen,

				       DMA_TO_DEVICE);

	if (dma_mapping_error(dd->dev, ctx->dma_addr)) {

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

		return -EINVAL;

	}



	/* next call does not fail... so no unmap in the case of error */

	return omap_sham_xmit_dma(dd, ctx->dma_addr, length, final);

}



static int omap_sham_update_dma_slow(struct omap_sham_dev *dd)

{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
@@ -403,7 +406,7 @@ static int omap_sham_update_dma_slow(struct omap_sham_dev *dd) 
	if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {

		count = ctx->bufcnt;

		ctx->bufcnt = 0;

		return omap_sham_xmit_dma(dd, ctx->dma_addr, count, final);

		return omap_sham_xmit_dma_map(dd, ctx, count, final);

	}



	return 0;
@@ -413,7 +416,6 @@ static int omap_sham_update_dma_fast(struct omap_sham_dev *dd) 
{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);

	unsigned int length;

	int err;



	ctx->flags |= FLAGS_FAST;
@@ -427,11 +429,8 @@ static int omap_sham_update_dma_fast(struct omap_sham_dev *dd) 


	ctx->total -= length;



	err = omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, 1);

	if (err != -EINPROGRESS)

		dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);



	return err;

	/* next call does not fail... so no unmap in the case of error */

	return omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, 1);

}



static int omap_sham_update_cpu(struct omap_sham_dev *dd)
@@ -453,6 +452,9 @@ static int omap_sham_update_dma_stop(struct omap_sham_dev *dd) 
	omap_stop_dma(dd->dma_lch);

	if (ctx->flags & FLAGS_FAST)

		dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);

	else

		dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen,

				 DMA_TO_DEVICE);



	return 0;

}
@@ -471,18 +473,9 @@ static void omap_sham_cleanup(struct ahash_request *req) 
	ctx->flags |= FLAGS_CLEAN;

	spin_unlock_irqrestore(&dd->lock, flags);



	if (ctx->digcnt) {

		clk_disable(dd->iclk);

	if (ctx->digcnt)

		memcpy(req->result, ctx->digest, (ctx->flags & FLAGS_SHA1) ?

				SHA1_DIGEST_SIZE : MD5_DIGEST_SIZE);

	}



	if (ctx->dma_addr)

		dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen,

				 DMA_TO_DEVICE);



	if (ctx->buffer)

		free_page((unsigned long)ctx->buffer);



	dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt);

}
@@ -520,21 +513,7 @@ static int omap_sham_init(struct ahash_request *req) 


	ctx->bufcnt = 0;

	ctx->digcnt = 0;



	ctx->buflen = PAGE_SIZE;

	ctx->buffer = (void *)__get_free_page(

				(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?

				GFP_KERNEL : GFP_ATOMIC);

	if (!ctx->buffer)

		return -ENOMEM;



	ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen,

					DMA_TO_DEVICE);

	if (dma_mapping_error(dd->dev, ctx->dma_addr)) {

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

		free_page((unsigned long)ctx->buffer);

		return -EINVAL;

	}

	ctx->buflen = BUFLEN;



	if (tctx->flags & FLAGS_HMAC) {

		struct omap_sham_hmac_ctx *bctx = tctx->base;
@@ -581,7 +560,7 @@ static int omap_sham_final_req(struct omap_sham_dev *dd) 
		use_dma = 0;



	if (use_dma)

		err = omap_sham_xmit_dma(dd, ctx->dma_addr, ctx->bufcnt, 1);

		err = omap_sham_xmit_dma_map(dd, ctx, ctx->bufcnt, 1);

	else

		err = omap_sham_xmit_cpu(dd, ctx->buffer, ctx->bufcnt, 1);
@@ -615,6 +594,7 @@ static int omap_sham_finish_req_hmac(struct ahash_request *req) 
static void omap_sham_finish_req(struct ahash_request *req, int err)

{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(req);

	struct omap_sham_dev *dd = ctx->dd;



	if (!err) {

		omap_sham_copy_hash(ctx->dd->req, 1);
@@ -627,7 +607,8 @@ static void omap_sham_finish_req(struct ahash_request *req, int err) 
	if ((ctx->flags & FLAGS_FINAL) || err)

		omap_sham_cleanup(req);



	ctx->dd->flags &= ~FLAGS_BUSY;

	clk_disable(dd->iclk);

	dd->flags &= ~FLAGS_BUSY;



	if (req->base.complete)

		req->base.complete(&req->base, err);
@@ -636,7 +617,7 @@ static void omap_sham_finish_req(struct ahash_request *req, int err) 
static int omap_sham_handle_queue(struct omap_sham_dev *dd,

				  struct ahash_request *req)

{

	struct crypto_async_request *async_req, *backlog;

	struct crypto_async_request *async_req, *backlog = 0;

	struct omap_sham_reqctx *ctx;

	struct ahash_request *prev_req;

	unsigned long flags;
@@ -672,7 +653,22 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd, 
	dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",

						ctx->op, req->nbytes);



	if (req != prev_req && ctx->digcnt)



	err = omap_sham_hw_init(dd);

	if (err)

		goto err1;



	omap_set_dma_dest_params(dd->dma_lch, 0,

			OMAP_DMA_AMODE_CONSTANT,

			dd->phys_base + SHA_REG_DIN(0), 0, 16);



	omap_set_dma_dest_burst_mode(dd->dma_lch,

			OMAP_DMA_DATA_BURST_16);



	omap_set_dma_src_burst_mode(dd->dma_lch,

			OMAP_DMA_DATA_BURST_4);



	if (ctx->digcnt)

		/* request has changed - restore hash */

		omap_sham_copy_hash(req, 0);
@@ -684,7 +680,7 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd, 
	} else if (ctx->op == OP_FINAL) {

		err = omap_sham_final_req(dd);

	}



err1:

	if (err != -EINPROGRESS) {

		/* done_task will not finish it, so do it here */

		omap_sham_finish_req(req, err);
@@ -868,7 +864,7 @@ static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base) 
	}



	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),

				 sizeof(struct omap_sham_reqctx));

				 sizeof(struct omap_sham_reqctx) + BUFLEN);



	if (alg_base) {

		struct omap_sham_hmac_ctx *bctx = tctx->base;
@@ -954,7 +950,7 @@ static struct ahash_alg algs[] = { 
						CRYPTO_ALG_NEED_FALLBACK,

		.cra_blocksize		= SHA1_BLOCK_SIZE,

		.cra_ctxsize		= sizeof(struct omap_sham_ctx),

		.cra_alignmask		= 0,

		.cra_alignmask		= OMAP_ALIGN_MASK,

		.cra_module		= THIS_MODULE,

		.cra_init		= omap_sham_cra_init,

		.cra_exit		= omap_sham_cra_exit,
@@ -978,7 +974,7 @@ static struct ahash_alg algs[] = { 
		.cra_blocksize		= SHA1_BLOCK_SIZE,

		.cra_ctxsize		= sizeof(struct omap_sham_ctx) +

					sizeof(struct omap_sham_hmac_ctx),

		.cra_alignmask		= 0,

		.cra_alignmask		= OMAP_ALIGN_MASK,

		.cra_module		= THIS_MODULE,

		.cra_init		= omap_sham_cra_sha1_init,

		.cra_exit		= omap_sham_cra_exit,
@@ -1002,7 +998,7 @@ static struct ahash_alg algs[] = { 
		.cra_blocksize		= SHA1_BLOCK_SIZE,

		.cra_ctxsize		= sizeof(struct omap_sham_ctx) +

					sizeof(struct omap_sham_hmac_ctx),

		.cra_alignmask		= 0,

		.cra_alignmask		= OMAP_ALIGN_MASK,

		.cra_module		= THIS_MODULE,

		.cra_init		= omap_sham_cra_md5_init,

		.cra_exit		= omap_sham_cra_exit,