[PATCH 4/4] crypto: ccp - Expand RSA support for a v5 ccp

[Gary R Hook <gary.hook@xxxxxxx>]

A V5 device can accommodate larger keys, as well as read the keys
directly from memory instead of requiring them to be in a local
storage block.


Signed-off-by: Gary R Hook <gary.hook@xxxxxxx>
---
 drivers/crypto/ccp/ccp-crypto-rsa.c |    5 ++++-
 drivers/crypto/ccp/ccp-crypto.h     |    1 +
 drivers/crypto/ccp/ccp-dev-v3.c     |    1 +
 drivers/crypto/ccp/ccp-dev-v5.c     |    2 ++
 drivers/crypto/ccp/ccp-dev.h        |    2 ++
 drivers/crypto/ccp/ccp-ops.c        |    3 ++-
 6 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/ccp/ccp-crypto-rsa.c b/drivers/crypto/ccp/ccp-crypto-rsa.c
index 4a2a71463594..93e6b00ce34d 100644
--- a/drivers/crypto/ccp/ccp-crypto-rsa.c
+++ b/drivers/crypto/ccp/ccp-crypto-rsa.c
@@ -43,7 +43,10 @@ static int ccp_rsa_complete(struct crypto_async_request *async_req, int ret)
 
 static unsigned int ccp_rsa_maxsize(struct crypto_akcipher *tfm)
 {
-	return CCP_RSA_MAXMOD;
+	if (ccp_version() > CCP_VERSION(3, 0))
+		return CCP5_RSA_MAXMOD;
+	else
+		return CCP_RSA_MAXMOD;
 }
 
 static int ccp_rsa_crypt(struct akcipher_request *req, bool encrypt)
diff --git a/drivers/crypto/ccp/ccp-crypto.h b/drivers/crypto/ccp/ccp-crypto.h
index 5d592ecc9af5..40598894113b 100644
--- a/drivers/crypto/ccp/ccp-crypto.h
+++ b/drivers/crypto/ccp/ccp-crypto.h
@@ -255,6 +255,7 @@ struct ccp_rsa_req_ctx {
 };
 
 #define	CCP_RSA_MAXMOD	(4 * 1024 / 8)
+#define	CCP5_RSA_MAXMOD	(16 * 1024 / 8)
 
 /***** Common Context Structure *****/
 struct ccp_ctx {
diff --git a/drivers/crypto/ccp/ccp-dev-v3.c b/drivers/crypto/ccp/ccp-dev-v3.c
index 367c2e30656f..9b159b0a891e 100644
--- a/drivers/crypto/ccp/ccp-dev-v3.c
+++ b/drivers/crypto/ccp/ccp-dev-v3.c
@@ -592,4 +592,5 @@ static void ccp_destroy(struct ccp_device *ccp)
 	.perform = &ccp3_actions,
 	.bar = 2,
 	.offset = 0x20000,
+	.rsamax = CCP_RSA_MAX_WIDTH,
 };
diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c
index 632518efd685..6043552322fd 100644
--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -1115,6 +1115,7 @@ static void ccp5other_config(struct ccp_device *ccp)
 	.perform = &ccp5_actions,
 	.bar = 2,
 	.offset = 0x0,
+	.rsamax = CCP5_RSA_MAX_WIDTH,
 };
 
 const struct ccp_vdata ccpv5b = {
@@ -1124,4 +1125,5 @@ static void ccp5other_config(struct ccp_device *ccp)
 	.perform = &ccp5_actions,
 	.bar = 2,
 	.offset = 0x0,
+	.rsamax = CCP5_RSA_MAX_WIDTH,
 };
diff --git a/drivers/crypto/ccp/ccp-dev.h b/drivers/crypto/ccp/ccp-dev.h
index a70154ac7405..8242cf54d90f 100644
--- a/drivers/crypto/ccp/ccp-dev.h
+++ b/drivers/crypto/ccp/ccp-dev.h
@@ -200,6 +200,7 @@
 #define CCP_SHA_SB_COUNT		1
 
 #define CCP_RSA_MAX_WIDTH		4096
+#define CCP5_RSA_MAX_WIDTH		16384
 
 #define CCP_PASSTHRU_BLOCKSIZE		256
 #define CCP_PASSTHRU_MASKSIZE		32
@@ -677,6 +678,7 @@ struct ccp_vdata {
 	const struct ccp_actions *perform;
 	const unsigned int bar;
 	const unsigned int offset;
+	const unsigned int rsamax;
 };
 
 extern const struct ccp_vdata ccpv3;
diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index 2cdd15a92178..ea5e4ede1eed 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -1737,7 +1737,8 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	unsigned int key_size_bytes;
 	int ret;
 
-	if (rsa->key_size > CCP_RSA_MAX_WIDTH)
+	/* Check against the maximum allowable size, in bits */
+	if (rsa->key_size > cmd_q->ccp->vdata->rsamax)
 		return -EINVAL;
 
 	if (!rsa->exp || !rsa->mod || !rsa->src || !rsa->dst)