[PATCH 07/10] crypto: inside-secure - improve error reporting

[Antoine Tenart <antoine.tenart@bootlin.com>]

This patch improves the error reporting from the Inside Secure driver to
the upper layers and crypto consumers. All errors reported by the engine
aren't fatal, and some may be genuine.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
---
 drivers/crypto/inside-secure/safexcel.c       | 21 +++++++++++++++++++
 drivers/crypto/inside-secure/safexcel.h       |  2 ++
 .../crypto/inside-secure/safexcel_cipher.c    |  8 ++-----
 drivers/crypto/inside-secure/safexcel_hash.c  |  7 ++-----
 4 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/drivers/crypto/inside-secure/safexcel.c b/drivers/crypto/inside-secure/safexcel.c
index d4a81be0d7d2..87e6d1a63886 100644
--- a/drivers/crypto/inside-secure/safexcel.c
+++ b/drivers/crypto/inside-secure/safexcel.c
@@ -537,6 +537,27 @@ void safexcel_dequeue(struct safexcel_crypto_priv *priv, int ring)
 	       EIP197_HIA_CDR(priv, ring) + EIP197_HIA_xDR_PREP_COUNT);
 }
 
+inline int safexcel_rdesc_check_errors(struct safexcel_crypto_priv *priv,
+				       struct safexcel_result_desc *rdesc)
+{
+	if (likely(!rdesc->result_data.error_code))
+		return 0;
+
+	if (rdesc->result_data.error_code & 0x407f) {
+		/* Fatal error (bits 0-7, 14) */
+		dev_err(priv->dev,
+			"cipher: result: result descriptor error (%d)\n",
+			rdesc->result_data.error_code);
+		return -EIO;
+	} else if (rdesc->result_data.error_code == BIT(9)) {
+		/* Authentication failed */
+		return -EBADMSG;
+	}
+
+	/* All other non-fatal errors */
+	return -EINVAL;
+}
+
 void safexcel_complete(struct safexcel_crypto_priv *priv, int ring)
 {
 	struct safexcel_command_desc *cdesc;
diff --git a/drivers/crypto/inside-secure/safexcel.h b/drivers/crypto/inside-secure/safexcel.h
index ac2fae340299..5fdf28f304f2 100644
--- a/drivers/crypto/inside-secure/safexcel.h
+++ b/drivers/crypto/inside-secure/safexcel.h
@@ -601,6 +601,8 @@ struct safexcel_inv_result {
 };
 
 void safexcel_dequeue(struct safexcel_crypto_priv *priv, int ring);
+int safexcel_rdesc_check_errors(struct safexcel_crypto_priv *priv,
+				struct safexcel_result_desc *rdesc);
 void safexcel_complete(struct safexcel_crypto_priv *priv, int ring);
 int safexcel_invalidate_cache(struct crypto_async_request *async,
 			      struct safexcel_crypto_priv *priv,
diff --git a/drivers/crypto/inside-secure/safexcel_cipher.c b/drivers/crypto/inside-secure/safexcel_cipher.c
index a658f8f14002..ad67891e7b08 100644
--- a/drivers/crypto/inside-secure/safexcel_cipher.c
+++ b/drivers/crypto/inside-secure/safexcel_cipher.c
@@ -160,12 +160,8 @@ static int safexcel_handle_req_result(struct safexcel_crypto_priv *priv, int rin
 			break;
 		}
 
-		if (rdesc->result_data.error_code) {
-			dev_err(priv->dev,
-				"cipher: result: result descriptor error (%d)\n",
-				rdesc->result_data.error_code);
-			*ret = -EIO;
-		}
+		if (likely(!*ret))
+			*ret = safexcel_rdesc_check_errors(priv, rdesc);
 
 		ndesc++;
 	} while (!rdesc->last_seg);
diff --git a/drivers/crypto/inside-secure/safexcel_hash.c b/drivers/crypto/inside-secure/safexcel_hash.c
index 317b9e480312..6b29e4bdd6ab 100644
--- a/drivers/crypto/inside-secure/safexcel_hash.c
+++ b/drivers/crypto/inside-secure/safexcel_hash.c
@@ -146,11 +146,8 @@ static int safexcel_handle_req_result(struct safexcel_crypto_priv *priv, int rin
 		dev_err(priv->dev,
 			"hash: result: could not retrieve the result descriptor\n");
 		*ret = PTR_ERR(rdesc);
-	} else if (rdesc->result_data.error_code) {
-		dev_err(priv->dev,
-			"hash: result: result descriptor error (%d)\n",
-			rdesc->result_data.error_code);
-		*ret = -EINVAL;
+	} else {
+		*ret = safexcel_rdesc_check_errors(priv, rdesc);
 	}
 
 	safexcel_complete(priv, ring);
-- 
2.17.0