linux-kernel - [v2 PATCH 8/9] crypto: kpp - Add ctx helpers with DMA alignment

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Message-Id: <E1oyQSB-000dkk-LW@formenos.hmeau.com>
Date:   Fri, 25 Nov 2022 12:36:43 +0800
From:   "Herbert Xu" <herbert@...dor.apana.org.au>
To:     Ard Biesheuvel <ardb@...nel.org>, Will Deacon <will@...nel.org>,
        Marc Zyngier <maz@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: [v2 PATCH 8/9] 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@...dor.apana.org.au>
---

 include/crypto/internal/kpp.h |   24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/include/crypto/internal/kpp.h b/include/crypto/internal/kpp.h
index 167662407e36..3c9726e89f53 100644
--- a/include/crypto/internal/kpp.h
+++ b/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)