crypto: kpp - Add ctx helpers with DMA alignment

This patch adds helpers to access the kpp context structure and
request context structure with an added alignment for DMA access.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/crypto/internal/kpp.h

@@ -50,15 +50,37 @@ static inline void *kpp_request_ctx(struct kpp_request *req)
 	return req->__ctx;
 }
 
+static inline void *kpp_request_ctx_dma(struct kpp_request *req)
+{
+	unsigned int align = crypto_dma_align();
+
+	if (align <= crypto_tfm_ctx_alignment())
+		align = 1;
+
+	return PTR_ALIGN(kpp_request_ctx(req), align);
+}
+
 static inline void kpp_set_reqsize(struct crypto_kpp *kpp,
 				   unsigned int reqsize)
 {
 	kpp->reqsize = reqsize;
 }
 
+static inline void kpp_set_reqsize_dma(struct crypto_kpp *kpp,
+				       unsigned int reqsize)
+{
+	reqsize += crypto_dma_align() & ~(crypto_tfm_ctx_alignment() - 1);
+	kpp->reqsize = reqsize;
+}
+
 static inline void *kpp_tfm_ctx(struct crypto_kpp *tfm)
 {
-	return tfm->base.__crt_ctx;
+	return crypto_tfm_ctx(&tfm->base);
+}
+
+static inline void *kpp_tfm_ctx_dma(struct crypto_kpp *tfm)
+{
+	return crypto_tfm_ctx_dma(&tfm->base);
 }
 
 static inline void kpp_request_complete(struct kpp_request *req, int err)