[PATCH v3 1/2] crypto: marvell - Use an unique pool to copy results of requests
Boris Brezillon
boris.brezillon at free-electrons.com
Tue Oct 4 06:17:03 PDT 2016
On Tue, 4 Oct 2016 14:57:19 +0200
Romain Perier <romain.perier at free-electrons.com> wrote:
> So far, we used a dedicated dma pool to copy the result of outer IV for
> cipher requests. Instead of using a dma pool per outer data, we prefer
> use the op dma pool that contains all part of the request from the SRAM.
> Then, the outer data that is likely to be used by the 'complete'
> operation, is copied later. In this way, any type of result can be
> retrieved by DMA for cipher or ahash requests.
>
> Signed-off-by: Romain Perier <romain.perier at free-electrons.com>
> ---
>
> Changes in v3:
> - Don't allocate a new op ctx for the last tdma descriptor. Instead
> we point to the last op ctx in the tdma chain, and copy the context
> of the current request to this location.
>
> Changes in v2:
> - Use the dma pool "op" to retrieve outer data intead of introducing
> a new one.
>
> drivers/crypto/marvell/cesa.c | 4 ----
> drivers/crypto/marvell/cesa.h | 5 ++---
> drivers/crypto/marvell/cipher.c | 8 +++++---
> drivers/crypto/marvell/tdma.c | 28 ++++++++++++++--------------
> 4 files changed, 21 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/crypto/marvell/cesa.c b/drivers/crypto/marvell/cesa.c
> index 37dadb2..6e7a5c7 100644
> --- a/drivers/crypto/marvell/cesa.c
> +++ b/drivers/crypto/marvell/cesa.c
> @@ -375,10 +375,6 @@ static int mv_cesa_dev_dma_init(struct mv_cesa_dev *cesa)
> if (!dma->padding_pool)
> return -ENOMEM;
>
> - dma->iv_pool = dmam_pool_create("cesa_iv", dev, 16, 1, 0);
> - if (!dma->iv_pool)
> - return -ENOMEM;
> -
> cesa->dma = dma;
>
> return 0;
> diff --git a/drivers/crypto/marvell/cesa.h b/drivers/crypto/marvell/cesa.h
> index e423d33..a768da7 100644
> --- a/drivers/crypto/marvell/cesa.h
> +++ b/drivers/crypto/marvell/cesa.h
> @@ -277,7 +277,7 @@ struct mv_cesa_op_ctx {
> #define CESA_TDMA_DUMMY 0
> #define CESA_TDMA_DATA 1
> #define CESA_TDMA_OP 2
> -#define CESA_TDMA_IV 3
> +#define CESA_TDMA_RESULT 3
>
> /**
> * struct mv_cesa_tdma_desc - TDMA descriptor
> @@ -393,7 +393,6 @@ struct mv_cesa_dev_dma {
> struct dma_pool *op_pool;
> struct dma_pool *cache_pool;
> struct dma_pool *padding_pool;
> - struct dma_pool *iv_pool;
> };
>
> /**
> @@ -839,7 +838,7 @@ mv_cesa_tdma_desc_iter_init(struct mv_cesa_tdma_chain *chain)
> memset(chain, 0, sizeof(*chain));
> }
>
> -int mv_cesa_dma_add_iv_op(struct mv_cesa_tdma_chain *chain, dma_addr_t src,
> +int mv_cesa_dma_add_result_op(struct mv_cesa_tdma_chain *chain, dma_addr_t src,
> u32 size, u32 flags, gfp_t gfp_flags);
>
> struct mv_cesa_op_ctx *mv_cesa_dma_add_op(struct mv_cesa_tdma_chain *chain,
> diff --git a/drivers/crypto/marvell/cipher.c b/drivers/crypto/marvell/cipher.c
> index d19dc96..098871a 100644
> --- a/drivers/crypto/marvell/cipher.c
> +++ b/drivers/crypto/marvell/cipher.c
> @@ -212,7 +212,8 @@ mv_cesa_ablkcipher_complete(struct crypto_async_request *req)
> struct mv_cesa_req *basereq;
>
> basereq = &creq->base;
> - memcpy(ablkreq->info, basereq->chain.last->data, ivsize);
> + memcpy(ablkreq->info, basereq->chain.last->op->ctx.blkcipher.iv,
> + ivsize);
> } else {
> memcpy_fromio(ablkreq->info,
> engine->sram + CESA_SA_CRYPT_IV_SRAM_OFFSET,
> @@ -373,8 +374,9 @@ static int mv_cesa_ablkcipher_dma_req_init(struct ablkcipher_request *req,
>
> /* Add output data for IV */
> ivsize = crypto_ablkcipher_ivsize(crypto_ablkcipher_reqtfm(req));
> - ret = mv_cesa_dma_add_iv_op(&basereq->chain, CESA_SA_CRYPT_IV_SRAM_OFFSET,
> - ivsize, CESA_TDMA_SRC_IN_SRAM, flags);
> + ret = mv_cesa_dma_add_result_op(&basereq->chain, CESA_SA_CFG_SRAM_OFFSET,
> + CESA_SA_DATA_SRAM_OFFSET,
> + CESA_TDMA_SRC_IN_SRAM, flags);
>
> if (ret)
> goto err_free_tdma;
> diff --git a/drivers/crypto/marvell/tdma.c b/drivers/crypto/marvell/tdma.c
> index 9fd7a5f..991dc3f 100644
> --- a/drivers/crypto/marvell/tdma.c
> +++ b/drivers/crypto/marvell/tdma.c
> @@ -69,9 +69,6 @@ void mv_cesa_dma_cleanup(struct mv_cesa_req *dreq)
> if (type == CESA_TDMA_OP)
> dma_pool_free(cesa_dev->dma->op_pool, tdma->op,
> le32_to_cpu(tdma->src));
> - else if (type == CESA_TDMA_IV)
> - dma_pool_free(cesa_dev->dma->iv_pool, tdma->data,
> - le32_to_cpu(tdma->dst));
>
> tdma = tdma->next;
> dma_pool_free(cesa_dev->dma->tdma_desc_pool, old_tdma,
> @@ -209,29 +206,32 @@ mv_cesa_dma_add_desc(struct mv_cesa_tdma_chain *chain, gfp_t flags)
> return new_tdma;
> }
>
> -int mv_cesa_dma_add_iv_op(struct mv_cesa_tdma_chain *chain, dma_addr_t src,
> +int mv_cesa_dma_add_result_op(struct mv_cesa_tdma_chain *chain, dma_addr_t src,
> u32 size, u32 flags, gfp_t gfp_flags)
> {
> -
> - struct mv_cesa_tdma_desc *tdma;
> - u8 *iv;
> - dma_addr_t dma_handle;
> + struct mv_cesa_tdma_desc *tdma, *op_desc;
>
> tdma = mv_cesa_dma_add_desc(chain, gfp_flags);
> if (IS_ERR(tdma))
> return PTR_ERR(tdma);
>
> - iv = dma_pool_alloc(cesa_dev->dma->iv_pool, gfp_flags, &dma_handle);
> - if (!iv)
> - return -ENOMEM;
Can you add a comment explaining what you're doing here?
/* We re-use an existing op_desc object to retrieve the context
* and result instead of allocating a new one.
* There is at least one object of this type in a CESA crypto
* req, just pick the first one in the chain.
*/
Once this is addressed, you can add my
Acked-by: Boris Brezillon <boris.brezillon at free-electrons.com>
> + for (op_desc = chain->first; op_desc; op_desc = op_desc->next) {
> + u32 type = op_desc->flags & CESA_TDMA_TYPE_MSK;
> +
> + if (type == CESA_TDMA_OP)
> + break;
> + }
> +
> + if (!op_desc)
> + return -EIO;
>
> tdma->byte_cnt = cpu_to_le32(size | BIT(31));
> tdma->src = src;
> - tdma->dst = cpu_to_le32(dma_handle);
> - tdma->data = iv;
> + tdma->dst = op_desc->src;
> + tdma->op = op_desc->op;
>
> flags &= (CESA_TDMA_DST_IN_SRAM | CESA_TDMA_SRC_IN_SRAM);
> - tdma->flags = flags | CESA_TDMA_IV;
> + tdma->flags = flags | CESA_TDMA_RESULT;
> return 0;
> }
>
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