Re: [PATCH 4/7] crypto: marvell: Moving the tdma chain out of mv_cesa_tdma_req

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On Wed, 15 Jun 2016 21:15:31 +0200
Romain Perier <romain.perier@xxxxxxxxxxxxxxxxxx> wrote:

> Actually the only way to access the tdma chain is to use the 'req' union

Currently, ...

> from a mv_cesa_{ablkcipher,ahash}. This will soon become a problem if we
> want to handle the TDMA chaining vs standard/non-DMA processing in a
> generic way (with generic functions at the cesa.c level detecting
> whether the request should be queued at the DMA level or not). Hence the
> decision to move the chain field a the mv_cesa_req level at the expense

				   at

> of adding 2 void * fields to all request contexts (including non-DMA
> ones). To limit the overhead, we get rid of the type field, which can
> now be deduced from the req->chain.first value.
> 
> Signed-off-by: Romain Perier <romain.perier@xxxxxxxxxxxxxxxxxx>
> ---
>  drivers/crypto/marvell/cesa.c   |  3 ++-
>  drivers/crypto/marvell/cesa.h   | 31 +++++++++++++------------------
>  drivers/crypto/marvell/cipher.c | 40 ++++++++++++++++++++++------------------
>  drivers/crypto/marvell/hash.c   | 36 +++++++++++++++---------------------
>  drivers/crypto/marvell/tdma.c   |  8 ++++----
>  5 files changed, 56 insertions(+), 62 deletions(-)
> 
> diff --git a/drivers/crypto/marvell/cesa.c b/drivers/crypto/marvell/cesa.c
> index 93700cd..fe04d1b 100644
> --- a/drivers/crypto/marvell/cesa.c
> +++ b/drivers/crypto/marvell/cesa.c
> @@ -111,7 +111,8 @@ static irqreturn_t mv_cesa_int(int irq, void *priv)
>  	return ret;
>  }
>  
> -int mv_cesa_queue_req(struct crypto_async_request *req)
> +int mv_cesa_queue_req(struct crypto_async_request *req,
> +		      struct mv_cesa_req *creq)
>  {
>  	int ret;
>  	int i;
> diff --git a/drivers/crypto/marvell/cesa.h b/drivers/crypto/marvell/cesa.h
> index 74b84bd..158ff82 100644
> --- a/drivers/crypto/marvell/cesa.h
> +++ b/drivers/crypto/marvell/cesa.h
> @@ -509,21 +509,11 @@ enum mv_cesa_req_type {
>  
>  /**
>   * struct mv_cesa_req - CESA request
> - * @type:	request type
>   * @engine:	engine associated with this request
> + * @chain:	list of tdma descriptors associated  with this request

						   ^ extra white space.

>   */
>  struct mv_cesa_req {
> -	enum mv_cesa_req_type type;
>  	struct mv_cesa_engine *engine;
> -};
> -
> -/**
> - * struct mv_cesa_tdma_req - CESA TDMA request
> - * @base:	base information
> - * @chain:	TDMA chain
> - */
> -struct mv_cesa_tdma_req {
> -	struct mv_cesa_req base;
>  	struct mv_cesa_tdma_chain chain;
>  };
>  
> @@ -562,7 +552,6 @@ struct mv_cesa_ablkcipher_std_req {
>  struct mv_cesa_ablkcipher_req {
>  	union {
>  		struct mv_cesa_req base;
> -		struct mv_cesa_tdma_req dma;
>  		struct mv_cesa_ablkcipher_std_req std;

Now that the dma specific fields are part of the base request there's no
reason to keep this union.

You can just put struct mv_cesa_req base; directly under struct
mv_cesa_ablkcipher_req, and move mv_cesa_ablkcipher_std_req fields in
mv_cesa_ablkcipher_req.

>  	} req;
>  	int src_nents;
> @@ -587,7 +576,6 @@ struct mv_cesa_ahash_std_req {
>   * @cache_dma:		DMA address of the cache buffer
>   */
>  struct mv_cesa_ahash_dma_req {
> -	struct mv_cesa_tdma_req base;
>  	u8 *padding;
>  	dma_addr_t padding_dma;
>  	u8 *cache;
> @@ -625,6 +613,12 @@ struct mv_cesa_ahash_req {
>  
>  extern struct mv_cesa_dev *cesa_dev;
>  
> +static inline enum mv_cesa_req_type
> +mv_cesa_req_get_type(struct mv_cesa_req *req)
> +{
> +	return req->chain.first ? CESA_DMA_REQ : CESA_STD_REQ;
> +}
> +
>  static inline void mv_cesa_update_op_cfg(struct mv_cesa_op_ctx *op,
>  					 u32 cfg, u32 mask)
>  {
> @@ -697,7 +691,8 @@ static inline bool mv_cesa_mac_op_is_first_frag(const struct mv_cesa_op_ctx *op)
>  		CESA_SA_DESC_CFG_FIRST_FRAG;
>  }
>  
> -int mv_cesa_queue_req(struct crypto_async_request *req);
> +int mv_cesa_queue_req(struct crypto_async_request *req,
> +		      struct mv_cesa_req *creq);
>  
>  /*
>   * Helper function that indicates whether a crypto request needs to be
> @@ -767,9 +762,9 @@ static inline bool mv_cesa_req_dma_iter_next_op(struct mv_cesa_dma_iter *iter)
>  	return iter->op_len;
>  }
>  
> -void mv_cesa_dma_step(struct mv_cesa_tdma_req *dreq);
> +void mv_cesa_dma_step(struct mv_cesa_req *dreq);
>  
> -static inline int mv_cesa_dma_process(struct mv_cesa_tdma_req *dreq,
> +static inline int mv_cesa_dma_process(struct mv_cesa_req *dreq,
>  				      u32 status)
>  {
>  	if (!(status & CESA_SA_INT_ACC0_IDMA_DONE))
> @@ -781,10 +776,10 @@ static inline int mv_cesa_dma_process(struct mv_cesa_tdma_req *dreq,
>  	return 0;
>  }
>  
> -void mv_cesa_dma_prepare(struct mv_cesa_tdma_req *dreq,
> +void mv_cesa_dma_prepare(struct mv_cesa_req *dreq,
>  			 struct mv_cesa_engine *engine);
> +void mv_cesa_dma_cleanup(struct mv_cesa_req *dreq);
>  
> -void mv_cesa_dma_cleanup(struct mv_cesa_tdma_req *dreq);
>  
>  static inline void
>  mv_cesa_tdma_desc_iter_init(struct mv_cesa_tdma_chain *chain)
> diff --git a/drivers/crypto/marvell/cipher.c b/drivers/crypto/marvell/cipher.c
> index f42620e..15d2c5a 100644
> --- a/drivers/crypto/marvell/cipher.c
> +++ b/drivers/crypto/marvell/cipher.c
> @@ -70,14 +70,14 @@ mv_cesa_ablkcipher_dma_cleanup(struct ablkcipher_request *req)
>  		dma_unmap_sg(cesa_dev->dev, req->src, creq->src_nents,
>  			     DMA_BIDIRECTIONAL);
>  	}
> -	mv_cesa_dma_cleanup(&creq->req.dma);
> +	mv_cesa_dma_cleanup(&creq->req.base);
>  }
>  
>  static inline void mv_cesa_ablkcipher_cleanup(struct ablkcipher_request *req)
>  {
>  	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)
>  		mv_cesa_ablkcipher_dma_cleanup(req);
>  }
>  
> @@ -141,19 +141,19 @@ static int mv_cesa_ablkcipher_process(struct crypto_async_request *req,
>  	struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req);
>  	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(ablkreq);
>  
> -	if (creq->req.base.type == CESA_DMA_REQ) {
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ) {
>  		int ret;
> -		struct mv_cesa_tdma_req *dreq;
> +		struct mv_cesa_req *basereq;
>  		unsigned int ivsize;
>  
> -		ret = mv_cesa_dma_process(&creq->req.dma, status);
> +		ret = mv_cesa_dma_process(&creq->req.base, status);

Initialize basereq earlier and pass it as the first argument of
mv_cesa_dma_process().

>  		if (ret)
>  			return ret;
>  
> -		dreq = &creq->req.dma;
> +		basereq = &creq->req.base;
>  		ivsize = crypto_ablkcipher_ivsize(
>  					     crypto_ablkcipher_reqtfm(ablkreq));
> -		memcpy_fromio(ablkreq->info, dreq->chain.last->data, ivsize);
> +		memcpy_fromio(ablkreq->info, basereq->chain.last->data, ivsize);
>  		return ret;
>  	}
>  	return mv_cesa_ablkcipher_std_process(ablkreq, status);
> @@ -164,8 +164,8 @@ static void mv_cesa_ablkcipher_step(struct crypto_async_request *req)
>  	struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req);
>  	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(ablkreq);
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> -		mv_cesa_dma_step(&creq->req.dma);
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)
> +		mv_cesa_dma_step(&creq->req.base);
>  	else
>  		mv_cesa_ablkcipher_std_step(ablkreq);
>  }
> @@ -174,9 +174,9 @@ static inline void
>  mv_cesa_ablkcipher_dma_prepare(struct ablkcipher_request *req)
>  {
>  	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
> -	struct mv_cesa_tdma_req *dreq = &creq->req.dma;
> +	struct mv_cesa_req *dreq = &creq->req.base;

You named it basereq in mv_cesa_ablkcipher_step(). Try to be
consistent, no matter the name.

>  
> -	mv_cesa_dma_prepare(dreq, dreq->base.engine);
> +	mv_cesa_dma_prepare(dreq, dreq->engine);
>  }
>  
>  static inline void
> @@ -199,7 +199,7 @@ static inline void mv_cesa_ablkcipher_prepare(struct crypto_async_request *req,
>  	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(ablkreq);
>  	creq->req.base.engine = engine;
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)
>  		mv_cesa_ablkcipher_dma_prepare(ablkreq);
>  	else
>  		mv_cesa_ablkcipher_std_prepare(ablkreq);
> @@ -302,14 +302,13 @@ static int mv_cesa_ablkcipher_dma_req_init(struct ablkcipher_request *req,
>  	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
>  	gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
>  		      GFP_KERNEL : GFP_ATOMIC;
> -	struct mv_cesa_tdma_req *dreq = &creq->req.dma;
> +	struct mv_cesa_req *dreq = &creq->req.base;

Ditto.

>  	struct mv_cesa_ablkcipher_dma_iter iter;
>  	struct mv_cesa_tdma_chain chain;
>  	bool skip_ctx = false;
>  	int ret;
>  	unsigned int ivsize;
>  
> -	dreq->base.type = CESA_DMA_REQ;
>  	dreq->chain.first = NULL;
>  	dreq->chain.last = NULL;
>  
> @@ -397,10 +396,12 @@ mv_cesa_ablkcipher_std_req_init(struct ablkcipher_request *req,
>  {
>  	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
>  	struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std;
> +	struct mv_cesa_req *basereq = &creq->req.base;
>  
> -	sreq->base.type = CESA_STD_REQ;
>  	sreq->op = *op_templ;
>  	sreq->skip_ctx = false;
> +	basereq->chain.first = NULL;
> +	basereq->chain.last = NULL;
>  
>  	return 0;
>  }
> @@ -442,6 +443,7 @@ static int mv_cesa_ablkcipher_req_init(struct ablkcipher_request *req,
>  static int mv_cesa_des_op(struct ablkcipher_request *req,
>  			  struct mv_cesa_op_ctx *tmpl)
>  {
> +	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
>  	struct mv_cesa_des_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
>  	int ret;
>  
> @@ -454,7 +456,7 @@ static int mv_cesa_des_op(struct ablkcipher_request *req,
>  	if (ret)
>  		return ret;
>  
> -	ret = mv_cesa_queue_req(&req->base);
> +	ret = mv_cesa_queue_req(&req->base, &creq->req.base);
>  	if (mv_cesa_req_needs_cleanup(&req->base, ret))
>  		mv_cesa_ablkcipher_cleanup(req);
>  
> @@ -562,6 +564,7 @@ struct crypto_alg mv_cesa_cbc_des_alg = {
>  static int mv_cesa_des3_op(struct ablkcipher_request *req,
>  			   struct mv_cesa_op_ctx *tmpl)
>  {
> +	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
>  	struct mv_cesa_des3_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
>  	int ret;
>  
> @@ -574,7 +577,7 @@ static int mv_cesa_des3_op(struct ablkcipher_request *req,
>  	if (ret)
>  		return ret;
>  
> -	ret = mv_cesa_queue_req(&req->base);
> +	ret = mv_cesa_queue_req(&req->base, &creq->req.base);
>  	if (mv_cesa_req_needs_cleanup(&req->base, ret))
>  		mv_cesa_ablkcipher_cleanup(req);
>  
> @@ -688,6 +691,7 @@ struct crypto_alg mv_cesa_cbc_des3_ede_alg = {
>  static int mv_cesa_aes_op(struct ablkcipher_request *req,
>  			  struct mv_cesa_op_ctx *tmpl)
>  {
> +	struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
>  	struct mv_cesa_aes_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
>  	int ret, i;
>  	u32 *key;
> @@ -716,7 +720,7 @@ static int mv_cesa_aes_op(struct ablkcipher_request *req,
>  	if (ret)
>  		return ret;
>  
> -	ret = mv_cesa_queue_req(&req->base);
> +	ret = mv_cesa_queue_req(&req->base, &creq->req.base);
>  	if (mv_cesa_req_needs_cleanup(&req->base, ret))
>  		mv_cesa_ablkcipher_cleanup(req);
>  
> diff --git a/drivers/crypto/marvell/hash.c b/drivers/crypto/marvell/hash.c
> index 0fae351..cc7c5b0 100644
> --- a/drivers/crypto/marvell/hash.c
> +++ b/drivers/crypto/marvell/hash.c
> @@ -103,14 +103,14 @@ static inline void mv_cesa_ahash_dma_cleanup(struct ahash_request *req)
>  
>  	dma_unmap_sg(cesa_dev->dev, req->src, creq->src_nents, DMA_TO_DEVICE);
>  	mv_cesa_ahash_dma_free_cache(&creq->req.dma);
> -	mv_cesa_dma_cleanup(&creq->req.dma.base);
> +	mv_cesa_dma_cleanup(&creq->req.base);
>  }
>  
>  static inline void mv_cesa_ahash_cleanup(struct ahash_request *req)
>  {
>  	struct mv_cesa_ahash_req *creq = ahash_request_ctx(req);
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)
>  		mv_cesa_ahash_dma_cleanup(req);
>  }
>  
> @@ -118,7 +118,7 @@ static void mv_cesa_ahash_last_cleanup(struct ahash_request *req)
>  {
>  	struct mv_cesa_ahash_req *creq = ahash_request_ctx(req);
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)
>  		mv_cesa_ahash_dma_last_cleanup(req);
>  }
>  
> @@ -256,9 +256,9 @@ static int mv_cesa_ahash_std_process(struct ahash_request *req, u32 status)
>  static inline void mv_cesa_ahash_dma_prepare(struct ahash_request *req)
>  {
>  	struct mv_cesa_ahash_req *creq = ahash_request_ctx(req);
> -	struct mv_cesa_tdma_req *dreq = &creq->req.dma.base;
> +	struct mv_cesa_req *dreq = &creq->req.base;

Ditto.

>  
> -	mv_cesa_dma_prepare(dreq, dreq->base.engine);
> +	mv_cesa_dma_prepare(dreq, dreq->engine);
>  }
>  
>  static void mv_cesa_ahash_std_prepare(struct ahash_request *req)
> @@ -277,8 +277,8 @@ static void mv_cesa_ahash_step(struct crypto_async_request *req)
>  	struct ahash_request *ahashreq = ahash_request_cast(req);
>  	struct mv_cesa_ahash_req *creq = ahash_request_ctx(ahashreq);
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> -		mv_cesa_dma_step(&creq->req.dma.base);
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)
> +		mv_cesa_dma_step(&creq->req.base);
>  	else
>  		mv_cesa_ahash_std_step(ahashreq);
>  }
> @@ -291,8 +291,8 @@ static int mv_cesa_ahash_process(struct crypto_async_request *req, u32 status)
>  	unsigned int digsize;
>  	int ret, i;
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> -		ret = mv_cesa_dma_process(&creq->req.dma.base, status);
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)
> +		ret = mv_cesa_dma_process(&creq->req.base, status);
>  	else
>  		ret = mv_cesa_ahash_std_process(ahashreq, status);
>  
> @@ -340,7 +340,7 @@ static void mv_cesa_ahash_prepare(struct crypto_async_request *req,
>  
>  	creq->req.base.engine = engine;
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)
>  		mv_cesa_ahash_dma_prepare(ahashreq);
>  	else
>  		mv_cesa_ahash_std_prepare(ahashreq);
> @@ -555,8 +555,7 @@ static int mv_cesa_ahash_dma_req_init(struct ahash_request *req)
>  	struct mv_cesa_ahash_req *creq = ahash_request_ctx(req);
>  	gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
>  		      GFP_KERNEL : GFP_ATOMIC;
> -	struct mv_cesa_ahash_dma_req *ahashdreq = &creq->req.dma;
> -	struct mv_cesa_tdma_req *dreq = &ahashdreq->base;
> +	struct mv_cesa_req *dreq = &creq->req.base;

Ditto.

>  	struct mv_cesa_ahash_dma_iter iter;
>  	struct mv_cesa_op_ctx *op = NULL;
>  	unsigned int frag_len;
> @@ -662,11 +661,6 @@ static int mv_cesa_ahash_req_init(struct ahash_request *req, bool *cached)
>  	struct mv_cesa_ahash_req *creq = ahash_request_ctx(req);
>  	int ret;
>  
> -	if (cesa_dev->caps->has_tdma)
> -		creq->req.base.type = CESA_DMA_REQ;
> -	else
> -		creq->req.base.type = CESA_STD_REQ;
> -

Hm, where is it decided now? I mean, I don't see this test anywhere
else in your patch, which means you're now always using standard mode.

>  	creq->src_nents = sg_nents_for_len(req->src, req->nbytes);
>  	if (creq->src_nents < 0) {
>  		dev_err(cesa_dev->dev, "Invalid number of src SG");
> @@ -680,7 +674,7 @@ static int mv_cesa_ahash_req_init(struct ahash_request *req, bool *cached)
>  	if (*cached)
>  		return 0;
>  
> -	if (creq->req.base.type == CESA_DMA_REQ)
> +	if (mv_cesa_req_get_type(&creq->req.base) == CESA_DMA_REQ)

Should be

	if (cesa_dev->caps->has_tdma)

>  		ret = mv_cesa_ahash_dma_req_init(req);
>  
>  	return ret;
> @@ -700,7 +694,7 @@ static int mv_cesa_ahash_update(struct ahash_request *req)
>  	if (cached)
>  		return 0;
>  
> -	ret = mv_cesa_queue_req(&req->base);
> +	ret = mv_cesa_queue_req(&req->base, &creq->req.base);
>  	if (mv_cesa_req_needs_cleanup(&req->base, ret))
>  		mv_cesa_ahash_cleanup(req);
>  
> @@ -725,7 +719,7 @@ static int mv_cesa_ahash_final(struct ahash_request *req)
>  	if (cached)
>  		return 0;
>  
> -	ret = mv_cesa_queue_req(&req->base);
> +	ret = mv_cesa_queue_req(&req->base, &creq->req.base);
>  	if (mv_cesa_req_needs_cleanup(&req->base, ret))
>  		mv_cesa_ahash_cleanup(req);
>  
> @@ -750,7 +744,7 @@ static int mv_cesa_ahash_finup(struct ahash_request *req)
>  	if (cached)
>  		return 0;
>  
> -	ret = mv_cesa_queue_req(&req->base);
> +	ret = mv_cesa_queue_req(&req->base, &creq->req.base);
>  	if (mv_cesa_req_needs_cleanup(&req->base, ret))
>  		mv_cesa_ahash_cleanup(req);
>  
> diff --git a/drivers/crypto/marvell/tdma.c b/drivers/crypto/marvell/tdma.c
> index 88c87be..9a424f9 100644
> --- a/drivers/crypto/marvell/tdma.c
> +++ b/drivers/crypto/marvell/tdma.c
> @@ -37,9 +37,9 @@ bool mv_cesa_req_dma_iter_next_transfer(struct mv_cesa_dma_iter *iter,
>  	return true;
>  }
>  
> -void mv_cesa_dma_step(struct mv_cesa_tdma_req *dreq)
> +void mv_cesa_dma_step(struct mv_cesa_req *dreq)
>  {
> -	struct mv_cesa_engine *engine = dreq->base.engine;
> +	struct mv_cesa_engine *engine = dreq->engine;
>  
>  	writel_relaxed(0, engine->regs + CESA_SA_CFG);
>  
> @@ -58,7 +58,7 @@ void mv_cesa_dma_step(struct mv_cesa_tdma_req *dreq)
>  	writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs + CESA_SA_CMD);
>  }
>  
> -void mv_cesa_dma_cleanup(struct mv_cesa_tdma_req *dreq)
> +void mv_cesa_dma_cleanup(struct mv_cesa_req *dreq)
>  {
>  	struct mv_cesa_tdma_desc *tdma;
>  
> @@ -81,7 +81,7 @@ void mv_cesa_dma_cleanup(struct mv_cesa_tdma_req *dreq)
>  	dreq->chain.last = NULL;
>  }
>  
> -void mv_cesa_dma_prepare(struct mv_cesa_tdma_req *dreq,
> +void mv_cesa_dma_prepare(struct mv_cesa_req *dreq,
>  			 struct mv_cesa_engine *engine)
>  {
>  	struct mv_cesa_tdma_desc *tdma;



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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