[PATCH 6/7] crypto: sun4i-ss: enabled stats via debugfs
From: Corentin Labbe
Date: Thu Sep 17 2020 - 14:37:10 EST
This patch enable to access usage stats for each algorithm.
Signed-off-by: Corentin Labbe <clabbe@xxxxxxxxxxxx>
---
drivers/crypto/allwinner/Kconfig | 9 ++++
.../allwinner/sun4i-ss/sun4i-ss-cipher.c | 21 ++++++++
.../crypto/allwinner/sun4i-ss/sun4i-ss-core.c | 54 +++++++++++++++++++
.../crypto/allwinner/sun4i-ss/sun4i-ss-hash.c | 8 +++
.../crypto/allwinner/sun4i-ss/sun4i-ss-prng.c | 5 ++
drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h | 11 ++++
6 files changed, 108 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 c21a1a0a8b16..be6599220e9d 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
@@ -34,6 +34,10 @@ 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;
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+ struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+ struct sun4i_ss_alg_template *algt;
+#endif
if (!areq->cryptlen)
return 0;
@@ -50,6 +54,12 @@ 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);
}
+#ifdef 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;
+#endif
+
spin_lock_irqsave(&ss->slock, flags);
for (i = 0; i < op->keylen / 4; i++)
@@ -134,7 +144,13 @@ 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;
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+ struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+ struct sun4i_ss_alg_template *algt;
+ algt = container_of(alg, struct sun4i_ss_alg_template, alg.crypto);
+ algt->stat_fb++;
+#endif
skcipher_request_set_tfm(&ctx->fallback_req, op->fallback_tfm);
skcipher_request_set_callback(&ctx->fallback_req, areq->base.flags,
areq->base.complete, areq->base.data);
@@ -228,6 +244,11 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
scatterwalk_map_and_copy(backup_iv, areq->src, areq->cryptlen - ivsize, ivsize, 0);
}
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+ algt->stat_req++;
+ algt->stat_bytes += areq->cryptlen;
+#endif
+
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..d044eb8f88b6 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c
@@ -234,6 +234,53 @@ 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 +501,13 @@ 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 dc35edd90034..3da60256f498 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-hash.c
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-hash.c
@@ -197,6 +197,10 @@ static int sun4i_hash(struct ahash_request *areq)
int in_r, err = 0;
size_t copied = 0;
__le32 wb = 0;
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+ struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
+ struct sun4i_ss_alg_template *algt;
+#endif
dev_dbg(ss->dev, "%s %s bc=%llu len=%u mode=%x wl=%u h0=%0x",
__func__, crypto_tfm_alg_name(areq->base.tfm),
@@ -397,6 +401,10 @@ static int sun4i_hash(struct ahash_request *areq)
*/
hash_final:
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+ algt = container_of(alg, struct sun4i_ss_alg_template, alg.hash);
+ algt->stat_req++;
+#endif
/* 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..102f8a90ce0f 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;
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+ algt->stat_req++;
+ algt->stat_bytes += todo;
+#endif
+
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 163962f9e284..a98a2c05089b 100644
--- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
+++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
@@ -13,6 +13,7 @@
#include <linux/clk.h>
#include <linux/crypto.h>
+#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -152,6 +153,10 @@ struct sun4i_ss_ctx {
#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
u32 seed[SS_SEED_LEN / BITS_PER_LONG];
#endif
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+ struct dentry *dbgfs_dir;
+ struct dentry *dbgfs_stats;
+#endif
};
struct sun4i_ss_alg_template {
@@ -163,6 +168,12 @@ struct sun4i_ss_alg_template {
struct rng_alg rng;
} alg;
struct sun4i_ss_ctx *ss;
+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG
+ unsigned long stat_req;
+ unsigned long stat_fb;
+ unsigned long stat_bytes;
+ unsigned long stat_opti;
+#endif
};
struct sun4i_tfm_ctx {
--
2.26.2