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From:   Iuliana Prodan <iuliana.prodan@nxp.com>
To:     Herbert Xu <herbert@gondor.apana.org.au>,
        Horia Geanta <horia.geanta@nxp.com>,
        Aymen Sghaier <aymen.sghaier@nxp.com>
Cc:     "David S. Miller" <davem@davemloft.net>,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-imx <linux-imx@nxp.com>,
        Iuliana Prodan <iuliana.prodan@nxp.com>
Subject: [PATCH v2 05/10] crypto: caam - change return code in caam_jr_enqueue function
Date:   Fri,  3 Jan 2020 03:02:48 +0200
Message-Id: <1578013373-1956-6-git-send-email-iuliana.prodan@nxp.com>
In-Reply-To: <1578013373-1956-1-git-send-email-iuliana.prodan@nxp.com>
References: <1578013373-1956-1-git-send-email-iuliana.prodan@nxp.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Based on commit 6b80ea389a0b ("crypto: change transient busy return code to -ENOSPC"),
change the return code of caam_jr_enqueue function to -EINPROGRESS, in
case of success, -ENOSPC in case the CAAM is busy (has no space left
in job ring queue), -EIO if it cannot map the caller's descriptor.

Update, also, the cases for resource-freeing for each algorithm type.

This is done for later use, on backlogging support in CAAM.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
---
 drivers/crypto/caam/caamalg.c  | 16 ++++------------
 drivers/crypto/caam/caamhash.c | 34 +++++++++++-----------------------
 drivers/crypto/caam/caampkc.c  | 16 ++++++++--------
 drivers/crypto/caam/caamrng.c  |  4 ++--
 drivers/crypto/caam/jr.c       |  8 ++++----
 drivers/crypto/caam/key_gen.c  |  2 +-
 6 files changed, 30 insertions(+), 50 deletions(-)

diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
index 6e021692..21b6172 100644
--- a/drivers/crypto/caam/caamalg.c
+++ b/drivers/crypto/caam/caamalg.c
@@ -1417,9 +1417,7 @@ static inline int chachapoly_crypt(struct aead_request *req, bool encrypt)
 			     1);
 
 	ret = caam_jr_enqueue(jrdev, desc, aead_crypt_done, req);
-	if (!ret) {
-		ret = -EINPROGRESS;
-	} else {
+	if (ret != -EINPROGRESS) {
 		aead_unmap(jrdev, edesc, req);
 		kfree(edesc);
 	}
@@ -1462,9 +1460,7 @@ static inline int aead_crypt(struct aead_request *req, bool encrypt)
 
 	desc = edesc->hw_desc;
 	ret = caam_jr_enqueue(jrdev, desc, aead_crypt_done, req);
-	if (!ret) {
-		ret = -EINPROGRESS;
-	} else {
+	if (ret != -EINPROGRESS) {
 		aead_unmap(jrdev, edesc, req);
 		kfree(edesc);
 	}
@@ -1507,9 +1503,7 @@ static inline int gcm_crypt(struct aead_request *req, bool encrypt)
 
 	desc = edesc->hw_desc;
 	ret = caam_jr_enqueue(jrdev, desc, aead_crypt_done, req);
-	if (!ret) {
-		ret = -EINPROGRESS;
-	} else {
+	if (ret != -EINPROGRESS) {
 		aead_unmap(jrdev, edesc, req);
 		kfree(edesc);
 	}
@@ -1725,9 +1719,7 @@ static inline int skcipher_crypt(struct skcipher_request *req, bool encrypt)
 	desc = edesc->hw_desc;
 	ret = caam_jr_enqueue(jrdev, desc, skcipher_crypt_done, req);
 
-	if (!ret) {
-		ret = -EINPROGRESS;
-	} else {
+	if (ret != -EINPROGRESS) {
 		skcipher_unmap(jrdev, edesc, req);
 		kfree(edesc);
 	}
diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index 844e391..b019d7e 100644
--- a/drivers/crypto/caam/caamhash.c
+++ b/drivers/crypto/caam/caamhash.c
@@ -395,7 +395,7 @@ static int hash_digest_key(struct caam_hash_ctx *ctx, u32 *keylen, u8 *key,
 	init_completion(&result.completion);
 
 	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
-	if (!ret) {
+	if (ret == -EINPROGRESS) {
 		/* in progress */
 		wait_for_completion(&result.completion);
 		ret = result.err;
@@ -833,10 +833,8 @@ static int ahash_update_ctx(struct ahash_request *req)
 				     desc_bytes(desc), 1);
 
 		ret = caam_jr_enqueue(jrdev, desc, ahash_done_bi, req);
-		if (ret)
+		if (ret != -EINPROGRESS)
 			goto unmap_ctx;
-
-		ret = -EINPROGRESS;
 	} else if (*next_buflen) {
 		scatterwalk_map_and_copy(buf + *buflen, req->src, 0,
 					 req->nbytes, 0);
@@ -908,10 +906,9 @@ static int ahash_final_ctx(struct ahash_request *req)
 			     1);
 
 	ret = caam_jr_enqueue(jrdev, desc, ahash_done_ctx_src, req);
-	if (ret)
-		goto unmap_ctx;
+	if (ret == -EINPROGRESS)
+		return ret;
 
-	return -EINPROGRESS;
  unmap_ctx:
 	ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_BIDIRECTIONAL);
 	kfree(edesc);
@@ -985,10 +982,9 @@ static int ahash_finup_ctx(struct ahash_request *req)
 			     1);
 
 	ret = caam_jr_enqueue(jrdev, desc, ahash_done_ctx_src, req);
-	if (ret)
-		goto unmap_ctx;
+	if (ret == -EINPROGRESS)
+		return ret;
 
-	return -EINPROGRESS;
  unmap_ctx:
 	ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_BIDIRECTIONAL);
 	kfree(edesc);
@@ -1058,9 +1054,7 @@ static int ahash_digest(struct ahash_request *req)
 			     1);
 
 	ret = caam_jr_enqueue(jrdev, desc, ahash_done, req);
-	if (!ret) {
-		ret = -EINPROGRESS;
-	} else {
+	if (ret != -EINPROGRESS) {
 		ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_FROM_DEVICE);
 		kfree(edesc);
 	}
@@ -1110,9 +1104,7 @@ static int ahash_final_no_ctx(struct ahash_request *req)
 			     1);
 
 	ret = caam_jr_enqueue(jrdev, desc, ahash_done, req);
-	if (!ret) {
-		ret = -EINPROGRESS;
-	} else {
+	if (ret != -EINPROGRESS) {
 		ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_FROM_DEVICE);
 		kfree(edesc);
 	}
@@ -1223,10 +1215,9 @@ static int ahash_update_no_ctx(struct ahash_request *req)
 				     desc_bytes(desc), 1);
 
 		ret = caam_jr_enqueue(jrdev, desc, ahash_done_ctx_dst, req);
-		if (ret)
+		if (ret != -EINPROGRESS)
 			goto unmap_ctx;
 
-		ret = -EINPROGRESS;
 		state->update = ahash_update_ctx;
 		state->finup = ahash_finup_ctx;
 		state->final = ahash_final_ctx;
@@ -1315,9 +1306,7 @@ static int ahash_finup_no_ctx(struct ahash_request *req)
 			     1);
 
 	ret = caam_jr_enqueue(jrdev, desc, ahash_done, req);
-	if (!ret) {
-		ret = -EINPROGRESS;
-	} else {
+	if (ret != -EINPROGRESS) {
 		ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_FROM_DEVICE);
 		kfree(edesc);
 	}
@@ -1411,10 +1400,9 @@ static int ahash_update_first(struct ahash_request *req)
 				     desc_bytes(desc), 1);
 
 		ret = caam_jr_enqueue(jrdev, desc, ahash_done_ctx_dst, req);
-		if (ret)
+		if (ret != -EINPROGRESS)
 			goto unmap_ctx;
 
-		ret = -EINPROGRESS;
 		state->update = ahash_update_ctx;
 		state->finup = ahash_finup_ctx;
 		state->final = ahash_final_ctx;
diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
index ebf1677..7f7ea32 100644
--- a/drivers/crypto/caam/caampkc.c
+++ b/drivers/crypto/caam/caampkc.c
@@ -634,8 +634,8 @@ static int caam_rsa_enc(struct akcipher_request *req)
 	init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
 
 	ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, req);
-	if (!ret)
-		return -EINPROGRESS;
+	if (ret == -EINPROGRESS)
+		return ret;
 
 	rsa_pub_unmap(jrdev, edesc, req);
 
@@ -667,8 +667,8 @@ static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
 	init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
 
 	ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, req);
-	if (!ret)
-		return -EINPROGRESS;
+	if (ret == -EINPROGRESS)
+		return ret;
 
 	rsa_priv_f1_unmap(jrdev, edesc, req);
 
@@ -700,8 +700,8 @@ static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
 	init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
 
 	ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, req);
-	if (!ret)
-		return -EINPROGRESS;
+	if (ret == -EINPROGRESS)
+		return ret;
 
 	rsa_priv_f2_unmap(jrdev, edesc, req);
 
@@ -733,8 +733,8 @@ static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
 	init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
 
 	ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, req);
-	if (!ret)
-		return -EINPROGRESS;
+	if (ret == -EINPROGRESS)
+		return ret;
 
 	rsa_priv_f3_unmap(jrdev, edesc, req);
 
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index e8baaca..34cbb4a 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -133,7 +133,7 @@ static inline int submit_job(struct caam_rng_ctx *ctx, int to_current)
 	dev_dbg(jrdev, "submitting job %d\n", !(to_current ^ ctx->current_buf));
 	init_completion(&bd->filled);
 	err = caam_jr_enqueue(jrdev, desc, rng_done, ctx);
-	if (err)
+	if (err != -EINPROGRESS)
 		complete(&bd->filled); /* don't wait on failed job*/
 	else
 		atomic_inc(&bd->empty); /* note if pending */
@@ -153,7 +153,7 @@ static int caam_read(struct hwrng *rng, void *data, size_t max, bool wait)
 		if (atomic_read(&bd->empty) == BUF_EMPTY) {
 			err = submit_job(ctx, 1);
 			/* if can't submit job, can't even wait */
-			if (err)
+			if (err != -EINPROGRESS)
 				return 0;
 		}
 		/* no immediate data, so exit if not waiting */
diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index fc97cde..df2a050 100644
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -324,8 +324,8 @@ void caam_jr_free(struct device *rdev)
 EXPORT_SYMBOL(caam_jr_free);
 
 /**
- * caam_jr_enqueue() - Enqueue a job descriptor head. Returns 0 if OK,
- * -EBUSY if the queue is full, -EIO if it cannot map the caller's
+ * caam_jr_enqueue() - Enqueue a job descriptor head. Returns -EINPROGRESS
+ * if OK, -ENOSPC if the queue is full, -EIO if it cannot map the caller's
  * descriptor.
  * @dev:  device of the job ring to be used. This device should have
  *        been assigned prior by caam_jr_register().
@@ -377,7 +377,7 @@ int caam_jr_enqueue(struct device *dev, u32 *desc,
 	    CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {
 		spin_unlock_bh(&jrp->inplock);
 		dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);
-		return -EBUSY;
+		return -ENOSPC;
 	}
 
 	head_entry = &jrp->entinfo[head];
@@ -414,7 +414,7 @@ int caam_jr_enqueue(struct device *dev, u32 *desc,
 
 	spin_unlock_bh(&jrp->inplock);
 
-	return 0;
+	return -EINPROGRESS;
 }
 EXPORT_SYMBOL(caam_jr_enqueue);
 
diff --git a/drivers/crypto/caam/key_gen.c b/drivers/crypto/caam/key_gen.c
index 5a851dd..b0e8a49 100644
--- a/drivers/crypto/caam/key_gen.c
+++ b/drivers/crypto/caam/key_gen.c
@@ -108,7 +108,7 @@ int gen_split_key(struct device *jrdev, u8 *key_out,
 	init_completion(&result.completion);
 
 	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
-	if (!ret) {
+	if (ret == -EINPROGRESS) {
 		/* in progress */
 		wait_for_completion(&result.completion);
 		ret = result.err;
-- 
2.1.0