[PATCH 1/4] crypto: add CRYPTO_TFM_REQ_DMA flag

[Horia Geanta <horia.geanta@freescale.com>]

The CRYPTO_TFM_REQ_DMA flag can be used by backend implementations to
indicate to crypto API the need to allocate GFP_DMA memory
for private contexts of the crypto requests.

Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
---
 include/linux/crypto.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index fb5ef16d6a12..64258c9198d5 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -103,6 +103,7 @@
 #define CRYPTO_TFM_REQ_WEAK_KEY		0x00000100
 #define CRYPTO_TFM_REQ_MAY_SLEEP	0x00000200
 #define CRYPTO_TFM_REQ_MAY_BACKLOG	0x00000400
+#define CRYPTO_TFM_REQ_DMA		0x00000800
 #define CRYPTO_TFM_RES_WEAK_KEY		0x00100000
 #define CRYPTO_TFM_RES_BAD_KEY_LEN   	0x00200000
 #define CRYPTO_TFM_RES_BAD_KEY_SCHED 	0x00400000
@@ -1108,6 +1109,10 @@ static inline struct ablkcipher_request *ablkcipher_request_alloc(
 {
 	struct ablkcipher_request *req;
 
+	if (crypto_ablkcipher_reqsize(tfm) &&
+	    (crypto_ablkcipher_get_flags(tfm) & CRYPTO_TFM_REQ_DMA))
+		gfp |= GFP_DMA;
+
 	req = kmalloc(sizeof(struct ablkcipher_request) +
 		      crypto_ablkcipher_reqsize(tfm), gfp);
 
@@ -1471,6 +1476,10 @@ static inline struct aead_request *aead_request_alloc(struct crypto_aead *tfm,
 {
 	struct aead_request *req;
 
+	if (crypto_aead_reqsize(tfm) &&
+	    (crypto_aead_get_flags(tfm) & CRYPTO_TFM_REQ_DMA))
+		gfp |= GFP_DMA;
+
 	req = kmalloc(sizeof(*req) + crypto_aead_reqsize(tfm), gfp);
 
 	if (likely(req))
-- 
1.8.3.1