crypto: hash - Add ctx helpers with DMA alignment

This patch adds helpers to access the ahash context structure and
request context structure with an added alignment for DMA access.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 0a288dddcf5bef74c90f170a685f96f8a9438839..1a2a41b79253cdc62e8c40a05af749c40d86030b 100644 (file)
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -140,6 +140,11 @@ static inline void *crypto_ahash_ctx(struct crypto_ahash *tfm)
        return crypto_tfm_ctx(crypto_ahash_tfm(tfm));
 }
 
+static inline void *crypto_ahash_ctx_dma(struct crypto_ahash *tfm)
+{
+       return crypto_tfm_ctx_dma(crypto_ahash_tfm(tfm));
+}
+
 static inline struct ahash_alg *__crypto_ahash_alg(struct crypto_alg *alg)
 {
        return container_of(__crypto_hash_alg_common(alg), struct ahash_alg,
@@ -152,6 +157,13 @@ static inline void crypto_ahash_set_reqsize(struct crypto_ahash *tfm,
        tfm->reqsize = reqsize;
 }
 
+static inline void crypto_ahash_set_reqsize_dma(struct crypto_ahash *ahash,
+                                               unsigned int reqsize)
+{
+       reqsize += crypto_dma_align() & ~(crypto_tfm_ctx_alignment() - 1);
+       ahash->reqsize = reqsize;
+}
+
 static inline struct crypto_instance *ahash_crypto_instance(
        struct ahash_instance *inst)
 {
@@ -175,6 +187,16 @@ static inline void *ahash_instance_ctx(struct ahash_instance *inst)
        return crypto_instance_ctx(ahash_crypto_instance(inst));
 }
 
+static inline void *ahash_request_ctx_dma(struct ahash_request *req)
+{
+       unsigned int align = crypto_dma_align();
+
+       if (align <= crypto_tfm_ctx_alignment())
+               align = 1;
+
+       return PTR_ALIGN(ahash_request_ctx(req), align);
+}
+
 static inline void ahash_request_complete(struct ahash_request *req, int err)
 {
        req->base.complete(&req->base, err);