[PATCH 12/19] crypto: sun8i-ss: rework debugging

Corentin Labbe
2022-03-17T20:56:43Z

The "Fallback for xxx" message is annoying, remove it and store the
information in the debugfs.
In the same time, reports more fallback statistics.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
---
.../allwinner/sun8i-ss/sun8i-ss-cipher.c | 41 ++++++++++++++-----
.../crypto/allwinner/sun8i-ss/sun8i-ss-core.c | 21 ++++++++++
.../crypto/allwinner/sun8i-ss/sun8i-ss-hash.c | 36 ++++++++++++----
drivers/crypto/allwinner/sun8i-ss/sun8i-ss.h | 7 +++-
4 files changed, 83 insertions(+), 22 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
index c4cb1ab1eeaa..7f1940c6cc41 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
@@ -22,35 +22,54 @@

static bool sun8i_ss_need_fallback(struct skcipher_request *areq)
{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+ struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+ struct sun8i_ss_alg_template *algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
struct scatterlist *in_sg = areq->src;
struct scatterlist *out_sg = areq->dst;
struct scatterlist *sg;

- if (areq->cryptlen == 0 || areq->cryptlen % 16)
+ if (areq->cryptlen == 0 || areq->cryptlen % 16) {
+ algt->stat_fb_len++;
return true;
+ }

if (sg_nents_for_len(areq->src, areq->cryptlen) > 8 ||
- sg_nents_for_len(areq->dst, areq->cryptlen) > 8)
+ sg_nents_for_len(areq->dst, areq->cryptlen) > 8) {
+ algt->stat_fb_sgnum++;
return true;
+ }

sg = areq->src;
while (sg) {
- if ((sg->length % 16) != 0)
+ if ((sg->length % 16) != 0) {
+ algt->stat_fb_sglen++;
return true;
- if ((sg_dma_len(sg) % 16) != 0)
+ }
+ if ((sg_dma_len(sg) % 16) != 0) {
+ algt->stat_fb_sglen++;
return true;
- if (!IS_ALIGNED(sg->offset, 16))
+ }
+ if (!IS_ALIGNED(sg->offset, 16)) {
+ algt->stat_fb_align++;
return true;
+ }
sg = sg_next(sg);
}
sg = areq->dst;
while (sg) {
- if ((sg->length % 16) != 0)
+ if ((sg->length % 16) != 0) {
+ algt->stat_fb_sglen++;
return true;
- if ((sg_dma_len(sg) % 16) != 0)
+ }
+ if ((sg_dma_len(sg) % 16) != 0) {
+ algt->stat_fb_sglen++;
return true;
- if (!IS_ALIGNED(sg->offset, 16))
+ }
+ if (!IS_ALIGNED(sg->offset, 16)) {
+ algt->stat_fb_align++;
return true;
+ }
sg = sg_next(sg);
}

@@ -385,9 +404,9 @@ int sun8i_ss_cipher_init(struct crypto_tfm *tfm)
crypto_skcipher_reqsize(op->fallback_tfm);

- dev_info(op->ss->dev, "Fallback for %s is %s\n",
- crypto_tfm_alg_driver_name(&sktfm->base),
- crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)));
+ memcpy(algt->fbname,
+ crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)),
+ CRYPTO_MAX_ALG_NAME);

op->enginectx.op.do_one_request = sun8i_ss_handle_cipher_request;
op->enginectx.op.prepare_request = NULL;
diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-core.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-core.c
index 8d31fd4968f3..f09de5737e8b 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-core.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-core.c
@@ -430,6 +430,17 @@ static int sun8i_ss_debugfs_show(struct seq_file *seq, void *v)
ss_algs[i].alg.skcipher.base.cra_driver_name,
ss_algs[i].alg.skcipher.base.cra_name,
ss_algs[i].stat_req, ss_algs[i].stat_fb);
+
+ seq_printf(seq, "\tLast fallback is: %s\n",
+ ss_algs[i].fbname);
+ seq_printf(seq, "\tFallback due to length: %lu\n",
+ ss_algs[i].stat_fb_len);
+ seq_printf(seq, "\tFallback due to SG length: %lu\n",
+ ss_algs[i].stat_fb_sglen);
+ seq_printf(seq, "\tFallback due to alignment: %lu\n",
+ ss_algs[i].stat_fb_align);
+ seq_printf(seq, "\tFallback due to SG numbers: %lu\n",
+ ss_algs[i].stat_fb_sgnum);
break;
case CRYPTO_ALG_TYPE_RNG:
seq_printf(seq, "%s %s reqs=%lu tsize=%lu\n",
@@ -442,6 +453,16 @@ static int sun8i_ss_debugfs_show(struct seq_file *seq, void *v)
ss_algs[i].alg.hash.halg.base.cra_driver_name,
ss_algs[i].alg.hash.halg.base.cra_name,
ss_algs[i].stat_req, ss_algs[i].stat_fb);
+ seq_printf(seq, "\tLast fallback is: %s\n",
+ ss_algs[i].fbname);
+ seq_printf(seq, "\tFallback due to length: %lu\n",
+ ss_algs[i].stat_fb_len);
+ seq_printf(seq, "\tFallback due to SG length: %lu\n",
+ ss_algs[i].stat_fb_sglen);
+ seq_printf(seq, "\tFallback due to alignment: %lu\n",
+ ss_algs[i].stat_fb_align);
+ seq_printf(seq, "\tFallback due to SG numbers: %lu\n",
+ ss_algs[i].stat_fb_sgnum);
break;
}
}
diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
index 1b44c1a115d6..cb510ec21ec4 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
@@ -51,9 +51,8 @@ int sun8i_ss_hash_crainit(struct crypto_tfm *tfm)
sizeof(struct sun8i_ss_hash_reqctx) +
crypto_ahash_reqsize(op->fallback_tfm));

- dev_info(op->ss->dev, "Fallback for %s is %s\n",
- crypto_tfm_alg_driver_name(tfm),
- crypto_tfm_alg_driver_name(&op->fallback_tfm->base));
+ memcpy(algt->fbname, crypto_tfm_alg_driver_name(&op->fallback_tfm->base), CRYPTO_MAX_ALG_NAME);
+
err = pm_runtime_get_sync(op->ss->dev);
if (err < 0)
goto error_pm;
@@ -259,16 +258,29 @@ static int sun8i_ss_run_hash_task(struct sun8i_ss_dev *ss,

static bool sun8i_ss_hash_need_fallback(struct ahash_request *areq)
{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
+ struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
+ struct sun8i_ss_alg_template *algt;
struct scatterlist *sg;

- if (areq->nbytes == 0)
+ algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash);
+
+ if (areq->nbytes == 0) {
+ algt->stat_fb_len++;
return true;
- if (areq->nbytes >= MAX_PAD_SIZE - 64)
+ }
+
+ if (areq->nbytes >= MAX_PAD_SIZE - 64) {
+ algt->stat_fb_len++;
return true;
+ }

/* we need to reserve one SG for the padding one */
- if (sg_nents(areq->src) > MAX_SG - 1)
+ if (sg_nents(areq->src) > MAX_SG - 1) {
+ algt->stat_fb_sgnum++;
return true;
+ }
+
sg = areq->src;
while (sg) {
/* SS can operate hash only on full block size
@@ -276,12 +288,18 @@ static bool sun8i_ss_hash_need_fallback(struct ahash_request *areq)
* is always 64
*/
/* Only the last block could be bounced to the pad buffer */
- if (sg->length % 64 && sg_next(sg))
+ if (sg->length % 64 && sg_next(sg)) {
+ algt->stat_fb_sglen++;
return true;
- if (!IS_ALIGNED(sg->offset, sizeof(u32)))
+ }
+ if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
+ algt->stat_fb_align++;
return true;
- if (sg->length % 4)
+ }
+ if (sg->length % 4) {
+ algt->stat_fb_sglen++;
return true;
+ }
sg = sg_next(sg);
}
return false;
diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss.h b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss.h
index 2e3524654aca..b56038de333b 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss.h
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss.h
@@ -279,11 +279,14 @@ struct sun8i_ss_alg_template {
struct rng_alg rng;
struct ahash_alg hash;
} alg;
-#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
unsigned long stat_req;
unsigned long stat_fb;
unsigned long stat_bytes;
-#endif
+ unsigned long stat_fb_len;
+ unsigned long stat_fb_sglen;
+ unsigned long stat_fb_align;
+ unsigned long stat_fb_sgnum;
+ char fbname[CRYPTO_MAX_ALG_NAME];
};

int sun8i_ss_enqueue(struct crypto_async_request *areq, u32 type);
--
2.34.1