[v2 PATCH 2/9] crypto: api - Add crypto_tfm_ctx_dma

Herbert Xu
2022-11-25T04:36:48Z

This patch adds the helpers crypto_tfm_ctx_aligned and
crypto_tfm_ctx_dma. The first aligns the tfm context to the
value cra_alignmask. The second sets the alignment according
to dma_cache_get_alignment();

This patch also moves crypto_tfm_ctx into algapi.h.

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

include/crypto/algapi.h | 41 +++++++++++++++++++++++++++++++++++++++--
include/linux/crypto.h | 5 -----
2 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index f50c5d1725da..4c99eb66e654 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -7,6 +7,7 @@
#ifndef _CRYPTO_ALGAPI_H
#define _CRYPTO_ALGAPI_H

+#include <asm/cache.h>
#include <linux/align.h>
#include <linux/crypto.h>
#include <linux/kconfig.h>
@@ -25,6 +26,14 @@
#define MAX_CIPHER_BLOCKSIZE 16
#define MAX_CIPHER_ALIGNMASK 15

+#ifdef ARCH_DMA_MINALIGN
+#define CRYPTO_DMA_ALIGN ARCH_DMA_MINALIGN
+#else
+#define CRYPTO_DMA_ALIGN CRYPTO_MINALIGN
+#endif
+
+#define CRYPTO_DMA_PADDING ((CRYPTO_DMA_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1))
+
struct crypto_aead;
struct crypto_instance;
struct module;
@@ -189,10 +198,38 @@ static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,
}
}

+static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
+{
+ return tfm->__crt_ctx;
+}
+
+static inline void *crypto_tfm_ctx_align(struct crypto_tfm *tfm,
+ unsigned int align)
+{
+ if (align <= crypto_tfm_ctx_alignment())
+ align = 1;
+
+ return PTR_ALIGN(crypto_tfm_ctx(tfm), align);
+}
+
static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
{
- return PTR_ALIGN(crypto_tfm_ctx(tfm),
- crypto_tfm_alg_alignmask(tfm) + 1);
+ return crypto_tfm_ctx_align(tfm, crypto_tfm_alg_alignmask(tfm) + 1);
+}
+
+static inline unsigned int crypto_dma_align(void)
+{
+ return CRYPTO_DMA_ALIGN;
+}
+
+static inline unsigned int crypto_dma_padding(void)
+{
+ return (crypto_dma_align() - 1) & ~(crypto_tfm_ctx_alignment() - 1);
+}
+
+static inline void *crypto_tfm_ctx_dma(struct crypto_tfm *tfm)
+{
+ return crypto_tfm_ctx_align(tfm, crypto_dma_align());
}

static inline struct crypto_instance *crypto_tfm_alg_instance(
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 2324ab6f1846..5d1e961f810e 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -714,11 +714,6 @@ static inline void crypto_tfm_clear_flags(struct crypto_tfm *tfm, u32 flags)
tfm->crt_flags &= ~flags;
}

-static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
-{
- return tfm->__crt_ctx;
-}
-
static inline unsigned int crypto_tfm_ctx_alignment(void)
{
struct crypto_tfm *tfm;