crypto: sun8i-ce - rework debugging

The "Fallback for xxx" message is annoying, remove it and store the
information in the debugfs.
Let's add more precise fallback stats and display it better.
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c

@@ -25,27 +25,54 @@ static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 	struct scatterlist *sg;
+	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+	struct sun8i_ce_alg_template *algt;
+
+	algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
 
 	if (sg_nents_for_len(areq->src, areq->cryptlen) > MAX_SG ||
-	    sg_nents_for_len(areq->dst, areq->cryptlen) > MAX_SG)
+	    sg_nents_for_len(areq->dst, areq->cryptlen) > MAX_SG) {
+		algt->stat_fb_maxsg++;
 		return true;
+	}
+
+	if (areq->cryptlen < crypto_skcipher_ivsize(tfm)) {
+		algt->stat_fb_leniv++;
+		return true;
+	}
 
-	if (areq->cryptlen < crypto_skcipher_ivsize(tfm))
+	if (areq->cryptlen == 0) {
+		algt->stat_fb_len0++;
 		return true;
+	}
 
-	if (areq->cryptlen == 0 || areq->cryptlen % 16)
+	if (areq->cryptlen % 16) {
+		algt->stat_fb_mod16++;
 		return true;
+	}
 
 	sg = areq->src;
 	while (sg) {
-		if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
+		if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
+			algt->stat_fb_srcali++;
+			return true;
+		}
+		if (sg->length % 4) {
+			algt->stat_fb_srclen++;
 			return true;
+		}
 		sg = sg_next(sg);
 	}
 	sg = areq->dst;
 	while (sg) {
-		if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
+		if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
+			algt->stat_fb_dstali++;
+			return true;
+		}
+		if (sg->length % 4) {
+			algt->stat_fb_dstlen++;
 			return true;
+		}
 		sg = sg_next(sg);
 	}
 	return false;
@@ -384,9 +411,9 @@ int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
 	sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) +
 			 crypto_skcipher_reqsize(op->fallback_tfm);
 
-	dev_info(op->ce->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_ce_cipher_run;
 	op->enginectx.op.prepare_request = sun8i_ce_cipher_prepare;

drivers/crypto/allwinner/sun8i-ce/sun8i-ce-core.c

@@ -595,19 +595,47 @@ static int sun8i_ce_debugfs_show(struct seq_file *seq, void *v)
 			continue;
 		switch (ce_algs[i].type) {
 		case CRYPTO_ALG_TYPE_SKCIPHER:
-			seq_printf(seq, "%s %s %lu %lu\n",
+			seq_printf(seq, "%s %s reqs=%lu fallback=%lu\n",
 				   ce_algs[i].alg.skcipher.base.cra_driver_name,
 				   ce_algs[i].alg.skcipher.base.cra_name,
 				   ce_algs[i].stat_req, ce_algs[i].stat_fb);
+			seq_printf(seq, "\tLast fallback is: %s\n",
+				   ce_algs[i].fbname);
+			seq_printf(seq, "\tFallback due to 0 length: %lu\n",
+				   ce_algs[i].stat_fb_len0);
+			seq_printf(seq, "\tFallback due to length !mod16: %lu\n",
+				   ce_algs[i].stat_fb_mod16);
+			seq_printf(seq, "\tFallback due to length < IV: %lu\n",
+				   ce_algs[i].stat_fb_leniv);
+			seq_printf(seq, "\tFallback due to source alignment: %lu\n",
+				   ce_algs[i].stat_fb_srcali);
+			seq_printf(seq, "\tFallback due to dest alignment: %lu\n",
+				   ce_algs[i].stat_fb_dstali);
+			seq_printf(seq, "\tFallback due to source length: %lu\n",
+				   ce_algs[i].stat_fb_srclen);
+			seq_printf(seq, "\tFallback due to dest length: %lu\n",
+				   ce_algs[i].stat_fb_dstlen);
+			seq_printf(seq, "\tFallback due to SG numbers: %lu\n",
+				   ce_algs[i].stat_fb_maxsg);
 			break;
 		case CRYPTO_ALG_TYPE_AHASH:
-			seq_printf(seq, "%s %s %lu %lu\n",
+			seq_printf(seq, "%s %s reqs=%lu fallback=%lu\n",
 				   ce_algs[i].alg.hash.halg.base.cra_driver_name,
 				   ce_algs[i].alg.hash.halg.base.cra_name,
 				   ce_algs[i].stat_req, ce_algs[i].stat_fb);
+			seq_printf(seq, "\tLast fallback is: %s\n",
+				   ce_algs[i].fbname);
+			seq_printf(seq, "\tFallback due to 0 length: %lu\n",
+				   ce_algs[i].stat_fb_len0);
+			seq_printf(seq, "\tFallback due to length: %lu\n",
+				   ce_algs[i].stat_fb_srclen);
+			seq_printf(seq, "\tFallback due to alignment: %lu\n",
+				   ce_algs[i].stat_fb_srcali);
+			seq_printf(seq, "\tFallback due to SG numbers: %lu\n",
+				   ce_algs[i].stat_fb_maxsg);
 			break;
 		case CRYPTO_ALG_TYPE_RNG:
-			seq_printf(seq, "%s %s %lu %lu\n",
+			seq_printf(seq, "%s %s reqs=%lu bytes=%lu\n",
 				   ce_algs[i].alg.rng.base.cra_driver_name,
 				   ce_algs[i].alg.rng.base.cra_name,
 				   ce_algs[i].stat_req, ce_algs[i].stat_bytes);

drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c

@@ -50,9 +50,9 @@ int sun8i_ce_hash_crainit(struct crypto_tfm *tfm)
 				 sizeof(struct sun8i_ce_hash_reqctx) +
 				 crypto_ahash_reqsize(op->fallback_tfm));
 
-	dev_info(op->ce->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->ce->dev);
 	if (err < 0)
 		goto error_pm;
@@ -199,17 +199,32 @@ static int sun8i_ce_hash_digest_fb(struct ahash_request *areq)
 
 static bool sun8i_ce_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_ce_alg_template *algt;
 	struct scatterlist *sg;
 
-	if (areq->nbytes == 0)
+	algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
+
+	if (areq->nbytes == 0) {
+		algt->stat_fb_len0++;
 		return true;
+	}
 	/* we need to reserve one SG for padding one */
-	if (sg_nents_for_len(areq->src, areq->nbytes) > MAX_SG - 1)
+	if (sg_nents_for_len(areq->src, areq->nbytes) > MAX_SG - 1) {
+		algt->stat_fb_maxsg++;
 		return true;
+	}
 	sg = areq->src;
 	while (sg) {
-		if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
+		if (sg->length % 4) {
+			algt->stat_fb_srclen++;
 			return true;
+		}
+		if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
+			algt->stat_fb_srcali++;
+			return true;
+		}
 		sg = sg_next(sg);
 	}
 	return false;

drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h

@@ -333,11 +333,18 @@ struct sun8i_ce_alg_template {
 		struct ahash_alg hash;
 		struct rng_alg rng;
 	} alg;
-#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 	unsigned long stat_req;
 	unsigned long stat_fb;
 	unsigned long stat_bytes;
-#endif
+	unsigned long stat_fb_maxsg;
+	unsigned long stat_fb_leniv;
+	unsigned long stat_fb_len0;
+	unsigned long stat_fb_mod16;
+	unsigned long stat_fb_srcali;
+	unsigned long stat_fb_srclen;
+	unsigned long stat_fb_dstali;
+	unsigned long stat_fb_dstlen;
+	char fbname[CRYPTO_MAX_ALG_NAME];
 };
 
 int sun8i_ce_enqueue(struct crypto_async_request *areq, u32 type);