[PATCH v3 0/7] crypto: sun4i-ss: prevent always fallback for ciphers

[PATCH v3 0/7] crypto: sun4i-ss: prevent always fallback for ciphers

[Corentin Labbe]

Hello

For help testing on "crypto: sun4i-ss - Fix sparse endianness markers",
I have added "stats" support like other allwinner's crypto drivers.
Seeing stats showed a clear problem, the ciphers function were not used
at all.
This is due to the not-inialized need_fallback which is "init" as true
everytime.
So basicly, since the patch introduced it, this probem hidden some bugs.

This serie fixes all hidden problems, then fix the initialization of
"need_fallback" and then add the stats like other allwinner drivers.

Regards

Changes since v2:
- patch #1: move buf/bufo out of function for reducing stack usage
- patch #4: use writesl()
- patch #6: use IS_ENABLED instead of #ifdef

Changes since v1:
- patch #4 is sufficient to fix BE problem (removed todo)

Corentin Labbe (7):
  crypto: sun4i-ss: linearize buffers content must be kept
  crypto: sun4i-ss: checking sg length is not sufficient
  crypto: sun4i-ss: IV register does not work on A10 and A13
  crypto: sun4i-ss: handle BigEndian for cipher
  crypto: sun4i-ss: initialize need_fallback
  crypto: sun4i-ss: enabled stats via debugfs
  crypto: sun4i-ss: add SPDX header and remove blank lines

 drivers/crypto/allwinner/Kconfig              |  9 ++
 .../allwinner/sun4i-ss/sun4i-ss-cipher.c      | 87 +++++++++++++------
 .../crypto/allwinner/sun4i-ss/sun4i-ss-core.c | 56 ++++++++++++
 .../crypto/allwinner/sun4i-ss/sun4i-ss-hash.c |  6 ++
 .../crypto/allwinner/sun4i-ss/sun4i-ss-prng.c |  6 ++
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h  |  8 ++
 6 files changed, 146 insertions(+), 26 deletions(-)

-- 
2.26.2


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[PATCH v3 1/7] crypto: sun4i-ss: linearize buffers content must be kept

[Corentin Labbe]

When running the non-optimized cipher function, SS produce partial random
output.
This is due to linearize buffers being reseted after each loop.

For preserving stack, instead of moving them back to start of function,
I move them in sun4i_ss_ctx.

Fixes: 8d3bcb9900ca ("crypto: sun4i-ss - reduce stack usage")
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 12 ++++--------
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h        |  2 ++
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
index b72de8939497..19f1aa577ed4 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
@@ -233,8 +233,6 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 
 	while (oleft) {
 		if (ileft) {
-			char buf[4 * SS_RX_MAX];/* buffer for linearize SG src */
-
 			/*
 			 * todo is the number of consecutive 4byte word that we
 			 * can read from current SG
@@ -256,12 +254,12 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 				 */
 				todo = min(rx_cnt * 4 - ob, ileft);
 				todo = min_t(size_t, todo, mi.length - oi);
-				memcpy(buf + ob, mi.addr + oi, todo);
+				memcpy(ss->buf + ob, mi.addr + oi, todo);
 				ileft -= todo;
 				oi += todo;
 				ob += todo;
 				if (!(ob % 4)) {
-					writesl(ss->base + SS_RXFIFO, buf,
+					writesl(ss->base + SS_RXFIFO, ss->buf,
 						ob / 4);
 					ob = 0;
 				}
@@ -295,13 +293,11 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 				oo = 0;
 			}
 		} else {
-			char bufo[4 * SS_TX_MAX]; /* buffer for linearize SG dst */
-
 			/*
 			 * read obl bytes in bufo, we read at maximum for
 			 * emptying the device
 			 */
-			readsl(ss->base + SS_TXFIFO, bufo, tx_cnt);
+			readsl(ss->base + SS_TXFIFO, ss->bufo, tx_cnt);
 			obl = tx_cnt * 4;
 			obo = 0;
 			do {
@@ -313,7 +309,7 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 				 */
 				todo = min_t(size_t,
 					     mo.length - oo, obl - obo);
-				memcpy(mo.addr + oo, bufo + obo, todo);
+				memcpy(mo.addr + oo, ss->bufo + obo, todo);
 				oleft -= todo;
 				obo += todo;
 				oo += todo;
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
index 163962f9e284..02105b39fbfe 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
@@ -148,6 +148,8 @@ struct sun4i_ss_ctx {
 	struct reset_control *reset;
 	struct device *dev;
 	struct resource *res;
+	char buf[4 * SS_RX_MAX];/* buffer for linearize SG src */
+	char bufo[4 * SS_TX_MAX]; /* buffer for linearize SG dst */
 	spinlock_t slock; /* control the use of the device */
 #ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
 	u32 seed[SS_SEED_LEN / BITS_PER_LONG];
-- 
2.26.2


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[PATCH v3 2/7] crypto: sun4i-ss: checking sg length is not sufficient

[Corentin Labbe]

The optimized cipher function need length multiple of 4 bytes.
But it get sometimes odd length.
This is due to SG data could be stored with an offset.

So the fix is to check also if the offset is aligned with 4 bytes.
Fixes: 6298e948215f2 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Cc: <stable@vger.kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
index 19f1aa577ed4..4dd736ee5a4d 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
@@ -186,12 +186,12 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 	 * we can use the SS optimized function
 	 */
 	while (in_sg && no_chunk == 1) {
-		if (in_sg->length % 4)
+		if (in_sg->length % 4 || !IS_ALIGNED(in_sg->offset, sizeof(u32)))
 			no_chunk = 0;
 		in_sg = sg_next(in_sg);
 	}
 	while (out_sg && no_chunk == 1) {
-		if (out_sg->length % 4)
+		if (out_sg->length % 4 || !IS_ALIGNED(out_sg->offset, sizeof(u32)))
 			no_chunk = 0;
 		out_sg = sg_next(out_sg);
 	}
-- 
2.26.2


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[PATCH v3 3/7] crypto: sun4i-ss: IV register does not work on A10 and A13

[Corentin Labbe]

Allwinner A10 and A13 SoC have a version of the SS which produce
invalid IV in IVx register.

Instead of adding a variant for those, let's convert SS to produce IV
directly from data.
Fixes: 6298e948215f2 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Cc: <stable@vger.kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
 .../allwinner/sun4i-ss/sun4i-ss-cipher.c      | 34 +++++++++++++++----
 1 file changed, 28 insertions(+), 6 deletions(-)

diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
index 4dd736ee5a4d..53478c3feca6 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
@@ -20,6 +20,7 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
 	unsigned int ivsize = crypto_skcipher_ivsize(tfm);
 	struct sun4i_cipher_req_ctx *ctx = skcipher_request_ctx(areq);
 	u32 mode = ctx->mode;
+	void *backup_iv = NULL;
 	/* when activating SS, the default FIFO space is SS_RX_DEFAULT(32) */
 	u32 rx_cnt = SS_RX_DEFAULT;
 	u32 tx_cnt = 0;
@@ -42,6 +43,13 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
 		return -EINVAL;
 	}
 
+	if (areq->iv && ivsize > 0 && mode & SS_DECRYPTION) {
+		backup_iv = kzalloc(ivsize, GFP_KERNEL);
+		if (!backup_iv)
+			return -ENOMEM;
+		scatterwalk_map_and_copy(backup_iv, areq->src, areq->cryptlen - ivsize, ivsize, 0);
+	}
+
 	spin_lock_irqsave(&ss->slock, flags);
 
 	for (i = 0; i < op->keylen; i += 4)
@@ -102,9 +110,12 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
 	} while (oleft);
 
 	if (areq->iv) {
-		for (i = 0; i < 4 && i < ivsize / 4; i++) {
-			v = readl(ss->base + SS_IV0 + i * 4);
-			*(u32 *)(areq->iv + i * 4) = v;
+		if (mode & SS_DECRYPTION) {
+			memcpy(areq->iv, backup_iv, ivsize);
+			kfree_sensitive(backup_iv);
+		} else {
+			scatterwalk_map_and_copy(areq->iv, areq->dst, areq->cryptlen - ivsize,
+						 ivsize, 0);
 		}
 	}
 
@@ -161,6 +172,7 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 	unsigned int ileft = areq->cryptlen;
 	unsigned int oleft = areq->cryptlen;
 	unsigned int todo;
+	void *backup_iv = NULL;
 	struct sg_mapping_iter mi, mo;
 	unsigned int oi, oo;	/* offset for in and out */
 	unsigned int ob = 0;	/* offset in buf */
@@ -202,6 +214,13 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 	if (need_fallback)
 		return sun4i_ss_cipher_poll_fallback(areq);
 
+	if (areq->iv && ivsize > 0 && mode & SS_DECRYPTION) {
+		backup_iv = kzalloc(ivsize, GFP_KERNEL);
+		if (!backup_iv)
+			return -ENOMEM;
+		scatterwalk_map_and_copy(backup_iv, areq->src, areq->cryptlen - ivsize, ivsize, 0);
+	}
+
 	spin_lock_irqsave(&ss->slock, flags);
 
 	for (i = 0; i < op->keylen; i += 4)
@@ -322,9 +341,12 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 		}
 	}
 	if (areq->iv) {
-		for (i = 0; i < 4 && i < ivsize / 4; i++) {
-			v = readl(ss->base + SS_IV0 + i * 4);
-			*(u32 *)(areq->iv + i * 4) = v;
+		if (mode & SS_DECRYPTION) {
+			memcpy(areq->iv, backup_iv, ivsize);
+			kfree_sensitive(backup_iv);
+		} else {
+			scatterwalk_map_and_copy(areq->iv, areq->dst, areq->cryptlen - ivsize,
+						 ivsize, 0);
 		}
 	}
 
-- 
2.26.2


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[PATCH v3 4/7] crypto: sun4i-ss: handle BigEndian for cipher

[Corentin Labbe]

Ciphers produce invalid results on BE.
Key and IV need to be written in LE.

Fixes: 6298e948215f2 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Cc: <stable@vger.kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
index 53478c3feca6..8f4621826330 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
@@ -52,13 +52,13 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
 
 	spin_lock_irqsave(&ss->slock, flags);
 
-	for (i = 0; i < op->keylen; i += 4)
-		writel(*(op->key + i / 4), ss->base + SS_KEY0 + i);
+	for (i = 0; i < op->keylen / 4; i++)
+		writesl(ss->base + SS_KEY0 + i * 4, &op->key[i], 1);
 
 	if (areq->iv) {
 		for (i = 0; i < 4 && i < ivsize / 4; i++) {
 			v = *(u32 *)(areq->iv + i * 4);
-			writel(v, ss->base + SS_IV0 + i * 4);
+			writesl(ss->base + SS_IV0 + i * 4, &v, 1);
 		}
 	}
 	writel(mode, ss->base + SS_CTL);
@@ -223,13 +223,13 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 
 	spin_lock_irqsave(&ss->slock, flags);
 
-	for (i = 0; i < op->keylen; i += 4)
-		writel(*(op->key + i / 4), ss->base + SS_KEY0 + i);
+	for (i = 0; i < op->keylen / 4; i++)
+		writesl(ss->base + SS_KEY0 + i * 4, &op->key[i], 1);
 
 	if (areq->iv) {
 		for (i = 0; i < 4 && i < ivsize / 4; i++) {
 			v = *(u32 *)(areq->iv + i * 4);
-			writel(v, ss->base + SS_IV0 + i * 4);
+			writesl(ss->base + SS_IV0 + i * 4, &v, 1);
 		}
 	}
 	writel(mode, ss->base + SS_CTL);
-- 
2.26.2


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[PATCH v3 5/7] crypto: sun4i-ss: initialize need_fallback

[Corentin Labbe]

The need_fallback is never initialized and seem to be always true at runtime.
So all hardware operations are always bypassed.

Fixes: 0ae1f46c55f87 ("crypto: sun4i-ss - fallback when length is not multiple of blocksize")
Cc: <stable@vger.kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
index 8f4621826330..7f4c97cc9627 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
@@ -179,7 +179,7 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 	unsigned int obo = 0;	/* offset in bufo*/
 	unsigned int obl = 0;	/* length of data in bufo */
 	unsigned long flags;
-	bool need_fallback;
+	bool need_fallback = false;
 
 	if (!areq->cryptlen)
 		return 0;
-- 
2.26.2


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[PATCH v3 6/7] crypto: sun4i-ss: enabled stats via debugfs

[Corentin Labbe]

This patch enable to access usage stats for each algorithm.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
 drivers/crypto/allwinner/Kconfig              |  9 +++
 .../allwinner/sun4i-ss/sun4i-ss-cipher.c      | 20 +++++++
 .../crypto/allwinner/sun4i-ss/sun4i-ss-core.c | 56 +++++++++++++++++++
 .../crypto/allwinner/sun4i-ss/sun4i-ss-hash.c |  6 ++
 .../crypto/allwinner/sun4i-ss/sun4i-ss-prng.c |  5 ++
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h  |  6 ++
 6 files changed, 102 insertions(+)

diff --git a/drivers/crypto/allwinner/Kconfig b/drivers/crypto/allwinner/Kconfig
index 0e72543ad1f1..e9b7f7e3d307 100644
--- a/drivers/crypto/allwinner/Kconfig
+++ b/drivers/crypto/allwinner/Kconfig
@@ -51,6 +51,15 @@ config CRYPTO_DEV_SUN4I_SS_PRNG
 	  Select this option if you want to provide kernel-side support for
 	  the Pseudo-Random Number Generator found in the Security System.
 
+config CRYPTO_DEV_SUN4I_SS_DEBUG
+	bool "Enable sun4i-ss stats"
+	depends on CRYPTO_DEV_SUN4I_SS
+	depends on DEBUG_FS
+	help
+	  Say y to enable sun4i-ss debug stats.
+	  This will create /sys/kernel/debug/sun4i-ss/stats for displaying
+	  the number of requests per algorithm.
+
 config CRYPTO_DEV_SUN8I_CE
 	tristate "Support for Allwinner Crypto Engine cryptographic offloader"
 	select CRYPTO_SKCIPHER
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
index 7f4c97cc9627..5af404f74a98 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
@@ -34,6 +34,8 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
 	struct sg_mapping_iter mi, mo;
 	unsigned int oi, oo; /* offset for in and out */
 	unsigned long flags;
+	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+	struct sun4i_ss_alg_template *algt;
 
 	if (!areq->cryptlen)
 		return 0;
@@ -50,6 +52,12 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
 		scatterwalk_map_and_copy(backup_iv, areq->src, areq->cryptlen - ivsize, ivsize, 0);
 	}
 
+	if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
+		algt = container_of(alg, struct sun4i_ss_alg_template, alg.crypto);
+		algt->stat_opti++;
+		algt->stat_bytes += areq->cryptlen;
+	}
+
 	spin_lock_irqsave(&ss->slock, flags);
 
 	for (i = 0; i < op->keylen / 4; i++)
@@ -134,6 +142,13 @@ static int noinline_for_stack sun4i_ss_cipher_poll_fallback(struct skcipher_requ
 	struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 	struct sun4i_cipher_req_ctx *ctx = skcipher_request_ctx(areq);
 	int err;
+	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+	struct sun4i_ss_alg_template *algt;
+
+	if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
+		algt = container_of(alg, struct sun4i_ss_alg_template, alg.crypto);
+		algt->stat_fb++;
+	}
 
 	skcipher_request_set_tfm(&ctx->fallback_req, op->fallback_tfm);
 	skcipher_request_set_callback(&ctx->fallback_req, areq->base.flags,
@@ -221,6 +236,11 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 		scatterwalk_map_and_copy(backup_iv, areq->src, areq->cryptlen - ivsize, ivsize, 0);
 	}
 
+	if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
+		algt->stat_req++;
+		algt->stat_bytes += areq->cryptlen;
+	}
+
 	spin_lock_irqsave(&ss->slock, flags);
 
 	for (i = 0; i < op->keylen / 4; i++)
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c
index a2b67f7f8a81..9a8a5e246d87 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c
@@ -10,6 +10,7 @@
  */
 #include <linux/clk.h>
 #include <linux/crypto.h>
+#include <linux/debugfs.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -234,6 +235,53 @@ static struct sun4i_ss_alg_template ss_algs[] = {
 #endif
 };
 
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+static int sun4i_ss_dbgfs_read(struct seq_file *seq, void *v)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(ss_algs); i++) {
+		if (!ss_algs[i].ss)
+			continue;
+		switch (ss_algs[i].type) {
+		case CRYPTO_ALG_TYPE_SKCIPHER:
+			seq_printf(seq, "%s %s reqs=%lu opti=%lu fallback=%lu tsize=%lu\n",
+				   ss_algs[i].alg.crypto.base.cra_driver_name,
+				   ss_algs[i].alg.crypto.base.cra_name,
+				   ss_algs[i].stat_req, ss_algs[i].stat_opti, ss_algs[i].stat_fb,
+				   ss_algs[i].stat_bytes);
+			break;
+		case CRYPTO_ALG_TYPE_RNG:
+			seq_printf(seq, "%s %s reqs=%lu tsize=%lu\n",
+				   ss_algs[i].alg.rng.base.cra_driver_name,
+				   ss_algs[i].alg.rng.base.cra_name,
+				   ss_algs[i].stat_req, ss_algs[i].stat_bytes);
+			break;
+		case CRYPTO_ALG_TYPE_AHASH:
+			seq_printf(seq, "%s %s reqs=%lu\n",
+				   ss_algs[i].alg.hash.halg.base.cra_driver_name,
+				   ss_algs[i].alg.hash.halg.base.cra_name,
+				   ss_algs[i].stat_req);
+			break;
+		}
+	}
+	return 0;
+}
+
+static int sun4i_ss_dbgfs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, sun4i_ss_dbgfs_read, inode->i_private);
+}
+
+static const struct file_operations sun4i_ss_debugfs_fops = {
+	.owner = THIS_MODULE,
+	.open = sun4i_ss_dbgfs_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+#endif
+
 /*
  * Power management strategy: The device is suspended unless a TFM exists for
  * one of the algorithms proposed by this driver.
@@ -454,6 +502,14 @@ static int sun4i_ss_probe(struct platform_device *pdev)
 			break;
 		}
 	}
+
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+	/* Ignore error of debugfs */
+	ss->dbgfs_dir = debugfs_create_dir("sun4i-ss", NULL);
+	ss->dbgfs_stats = debugfs_create_file("stats", 0444, ss->dbgfs_dir, ss,
+					      &sun4i_ss_debugfs_fops);
+#endif
+
 	return 0;
 error_alg:
 	i--;
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-hash.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-hash.c
index 1dff48558f53..c1b4585e9bbc 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-hash.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-hash.c
@@ -191,8 +191,10 @@ static int sun4i_hash(struct ahash_request *areq)
 	u32 spaces, rx_cnt = SS_RX_DEFAULT, bf[32] = {0}, v, ivmode = 0;
 	struct sun4i_req_ctx *op = ahash_request_ctx(areq);
 	struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
+	struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
 	struct sun4i_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
 	struct sun4i_ss_ctx *ss = tfmctx->ss;
+	struct sun4i_ss_alg_template *algt;
 	struct scatterlist *in_sg = areq->src;
 	struct sg_mapping_iter mi;
 	int in_r, err = 0;
@@ -398,6 +400,10 @@ static int sun4i_hash(struct ahash_request *areq)
  */
 
 hash_final:
+	if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
+		algt = container_of(alg, struct sun4i_ss_alg_template, alg.hash);
+		algt->stat_req++;
+	}
 
 	/* write the remaining words of the wait buffer */
 	if (op->len) {
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c
index 729aafdbea84..152841076e3a 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c
@@ -32,6 +32,11 @@ int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
 	if (err < 0)
 		return err;
 
+	if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
+		algt->stat_req++;
+		algt->stat_bytes += todo;
+	}
+
 	spin_lock_bh(&ss->slock);
 
 	writel(mode, ss->base + SS_CTL);
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
index 02105b39fbfe..e3e6cddf64af 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
@@ -154,6 +154,8 @@ struct sun4i_ss_ctx {
 #ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
 	u32 seed[SS_SEED_LEN / BITS_PER_LONG];
 #endif
+	struct dentry *dbgfs_dir;
+	struct dentry *dbgfs_stats;
 };
 
 struct sun4i_ss_alg_template {
@@ -165,6 +167,10 @@ struct sun4i_ss_alg_template {
 		struct rng_alg rng;
 	} alg;
 	struct sun4i_ss_ctx *ss;
+	unsigned long stat_req;
+	unsigned long stat_fb;
+	unsigned long stat_bytes;
+	unsigned long stat_opti;
 };
 
 struct sun4i_tfm_ctx {
-- 
2.26.2


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[PATCH v3 7/7] crypto: sun4i-ss: add SPDX header and remove blank lines

[Corentin Labbe]

This patchs fixes some remaining style issue.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 3 ---
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c   | 1 +
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
index 5af404f74a98..94b9952b16f3 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
@@ -135,7 +135,6 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
 	return err;
 }
 
-
 static int noinline_for_stack sun4i_ss_cipher_poll_fallback(struct skcipher_request *areq)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
@@ -541,7 +540,6 @@ int sun4i_ss_cipher_init(struct crypto_tfm *tfm)
 				    sizeof(struct sun4i_cipher_req_ctx) +
 				    crypto_skcipher_reqsize(op->fallback_tfm));
 
-
 	err = pm_runtime_get_sync(op->ss->dev);
 	if (err < 0)
 		goto error_pm;
@@ -628,5 +626,4 @@ int sun4i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
 
 	return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
-
 }
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c
index 152841076e3a..443160a114bb 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 #include "sun4i-ss.h"
 
 int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed,
-- 
2.26.2


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RE: [PATCH v3 2/7] crypto: sun4i-ss: checking sg length is not sufficient

[David Laight]

From: Corentin Labbe
> Sent: 16 November 2020 13:54
> 
> The optimized cipher function need length multiple of 4 bytes.
> But it get sometimes odd length.
> This is due to SG data could be stored with an offset.
> 
> So the fix is to check also if the offset is aligned with 4 bytes.
> Fixes: 6298e948215f2 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
> ---
>  drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-
> ss/sun4i-ss-cipher.c
> index 19f1aa577ed4..4dd736ee5a4d 100644
> --- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
> +++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
> @@ -186,12 +186,12 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
>  	 * we can use the SS optimized function
>  	 */
>  	while (in_sg && no_chunk == 1) {
> -		if (in_sg->length % 4)
> +		if (in_sg->length % 4 || !IS_ALIGNED(in_sg->offset, sizeof(u32)))

You probably ought to do the test in a consistent manner.
Probably something that reduces to:
	((unsigned long)in_sg->offset | in_sg->length) & 3u

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


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Re: [PATCH v3 4/7] crypto: sun4i-ss: handle BigEndian for cipher

[Arnd Bergmann]

On Mon, Nov 16, 2020 at 2:53 PM Corentin Labbe <clabbe@baylibre.com> wrote:
>
> Ciphers produce invalid results on BE.
> Key and IV need to be written in LE.
>
> Fixes: 6298e948215f2 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
> ---
>  drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
> index 53478c3feca6..8f4621826330 100644
> --- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
> +++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
> @@ -52,13 +52,13 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
>
>         spin_lock_irqsave(&ss->slock, flags);
>
> -       for (i = 0; i < op->keylen; i += 4)
> -               writel(*(op->key + i / 4), ss->base + SS_KEY0 + i);
> +       for (i = 0; i < op->keylen / 4; i++)
> +               writesl(ss->base + SS_KEY0 + i * 4, &op->key[i], 1);
>

This looks correct, but I wonder if we should just introduce
memcpy_toio32() and memcpy_fromio32() as a generic interface,
as this seems to come up occasionally, and the method here
(a loop around an inline function with another loop) is a bit clumsy.

      Arnd

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Re: [PATCH v3 6/7] crypto: sun4i-ss: enabled stats via debugfs

[Herbert Xu]

On Mon, Nov 16, 2020 at 01:53:44PM +0000, Corentin Labbe wrote:
>
> +#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
> +	/* Ignore error of debugfs */
> +	ss->dbgfs_dir = debugfs_create_dir("sun4i-ss", NULL);
> +	ss->dbgfs_stats = debugfs_create_file("stats", 0444, ss->dbgfs_dir, ss,
> +					      &sun4i_ss_debugfs_fops);
> +#endif

Since you didn't use ifdefs in the struct, there is no need to
use ifdefs here either.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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