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From: Jia Jie Ho <jiajie.ho@starfivetech.com>
To: Herbert Xu <herbert@gondor.apana.org.au>,
	"David S . Miller" <davem@davemloft.net>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>,
	Vinod Koul <vkoul@kernel.org>,
	linux-crypto@vger.kernel.org,
	devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	dmaengine@vger.kernel.org
Subject: [PATCH v4 2/7] crypto: starfive: Update hash dma usage
Date: Tue,  5 Mar 2024 15:10:01 +0800
Message-Id: <20240305071006.2181158-3-jiajie.ho@starfivetech.com>
In-Reply-To: <20240305071006.2181158-1-jiajie.ho@starfivetech.com>
References: <20240305071006.2181158-1-jiajie.ho@starfivetech.com>
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Current hash uses sw fallback for non-word aligned input scatterlists.
Add support for unaligned cases utilizing the data valid mask for dma.

Signed-off-by: Jia Jie Ho <jiajie.ho@starfivetech.com>
---
 drivers/crypto/starfive/jh7110-cryp.c |   9 -
 drivers/crypto/starfive/jh7110-cryp.h |   4 +-
 drivers/crypto/starfive/jh7110-hash.c | 275 +++++++++++---------------
 3 files changed, 112 insertions(+), 176 deletions(-)

diff --git a/drivers/crypto/starfive/jh7110-cryp.c b/drivers/crypto/starfive/jh7110-cryp.c
index 425fddf3a8ab..2685f5483639 100644
--- a/drivers/crypto/starfive/jh7110-cryp.c
+++ b/drivers/crypto/starfive/jh7110-cryp.c
@@ -103,12 +103,6 @@ static irqreturn_t starfive_cryp_irq(int irq, void *priv)
 		tasklet_schedule(&cryp->aes_done);
 	}
 
-	if (status & STARFIVE_IE_FLAG_HASH_DONE) {
-		mask |= STARFIVE_IE_MASK_HASH_DONE;
-		writel(mask, cryp->base + STARFIVE_IE_MASK_OFFSET);
-		tasklet_schedule(&cryp->hash_done);
-	}
-
 	return IRQ_HANDLED;
 }
 
@@ -132,7 +126,6 @@ static int starfive_cryp_probe(struct platform_device *pdev)
 				     "Error remapping memory for platform device\n");
 
 	tasklet_init(&cryp->aes_done, starfive_aes_done_task, (unsigned long)cryp);
-	tasklet_init(&cryp->hash_done, starfive_hash_done_task, (unsigned long)cryp);
 
 	cryp->phys_base = res->start;
 	cryp->dma_maxburst = 32;
@@ -220,7 +213,6 @@ static int starfive_cryp_probe(struct platform_device *pdev)
 	reset_control_assert(cryp->rst);
 
 	tasklet_kill(&cryp->aes_done);
-	tasklet_kill(&cryp->hash_done);
 
 	return ret;
 }
@@ -234,7 +226,6 @@ static void starfive_cryp_remove(struct platform_device *pdev)
 	starfive_rsa_unregister_algs();
 
 	tasklet_kill(&cryp->aes_done);
-	tasklet_kill(&cryp->hash_done);
 
 	crypto_engine_stop(cryp->engine);
 	crypto_engine_exit(cryp->engine);
diff --git a/drivers/crypto/starfive/jh7110-cryp.h b/drivers/crypto/starfive/jh7110-cryp.h
index 6cdf6db5d904..82327e21d340 100644
--- a/drivers/crypto/starfive/jh7110-cryp.h
+++ b/drivers/crypto/starfive/jh7110-cryp.h
@@ -91,6 +91,7 @@ union starfive_hash_csr {
 #define STARFIVE_HASH_KEY_DONE			BIT(13)
 		u32 key_done			:1;
 		u32 key_flag			:1;
+#define STARFIVE_HASH_HMAC_DONE			BIT(15)
 		u32 hmac_done			:1;
 #define STARFIVE_HASH_BUSY			BIT(16)
 		u32 busy			:1;
@@ -189,7 +190,7 @@ struct starfive_cryp_dev {
 	struct scatter_walk			out_walk;
 	struct crypto_engine			*engine;
 	struct tasklet_struct			aes_done;
-	struct tasklet_struct			hash_done;
+	struct completion			dma_done;
 	size_t					assoclen;
 	size_t					total_in;
 	size_t					total_out;
@@ -237,6 +238,5 @@ void starfive_rsa_unregister_algs(void);
 int starfive_aes_register_algs(void);
 void starfive_aes_unregister_algs(void);
 
-void starfive_hash_done_task(unsigned long param);
 void starfive_aes_done_task(unsigned long param);
 #endif
diff --git a/drivers/crypto/starfive/jh7110-hash.c b/drivers/crypto/starfive/jh7110-hash.c
index b6d1808012ca..2c60a1047bc3 100644
--- a/drivers/crypto/starfive/jh7110-hash.c
+++ b/drivers/crypto/starfive/jh7110-hash.c
@@ -36,15 +36,22 @@
 #define STARFIVE_HASH_BUFLEN		SHA512_BLOCK_SIZE
 #define STARFIVE_HASH_RESET		0x2
 
-static inline int starfive_hash_wait_busy(struct starfive_cryp_ctx *ctx)
+static inline int starfive_hash_wait_busy(struct starfive_cryp_dev *cryp)
 {
-	struct starfive_cryp_dev *cryp = ctx->cryp;
 	u32 status;
 
 	return readl_relaxed_poll_timeout(cryp->base + STARFIVE_HASH_SHACSR, status,
 					  !(status & STARFIVE_HASH_BUSY), 10, 100000);
 }
 
+static inline int starfive_hash_wait_hmac_done(struct starfive_cryp_dev *cryp)
+{
+	u32 status;
+
+	return readl_relaxed_poll_timeout(cryp->base + STARFIVE_HASH_SHACSR, status,
+					  (status & STARFIVE_HASH_HMAC_DONE), 10, 100000);
+}
+
 static inline int starfive_hash_wait_key_done(struct starfive_cryp_ctx *ctx)
 {
 	struct starfive_cryp_dev *cryp = ctx->cryp;
@@ -84,64 +91,26 @@ static int starfive_hash_hmac_key(struct starfive_cryp_ctx *ctx)
 	return 0;
 }
 
-static void starfive_hash_start(void *param)
+static void starfive_hash_start(struct starfive_cryp_dev *cryp)
 {
-	struct starfive_cryp_ctx *ctx = param;
-	struct starfive_cryp_request_ctx *rctx = ctx->rctx;
-	struct starfive_cryp_dev *cryp = ctx->cryp;
-	union starfive_alg_cr alg_cr;
 	union starfive_hash_csr csr;
-	u32 stat;
-
-	dma_unmap_sg(cryp->dev, rctx->in_sg, rctx->in_sg_len, DMA_TO_DEVICE);
-
-	alg_cr.v = 0;
-	alg_cr.clear = 1;
-
-	writel(alg_cr.v, cryp->base + STARFIVE_ALG_CR_OFFSET);
 
 	csr.v = readl(cryp->base + STARFIVE_HASH_SHACSR);
 	csr.firstb = 0;
 	csr.final = 1;
-
-	stat = readl(cryp->base + STARFIVE_IE_MASK_OFFSET);
-	stat &= ~STARFIVE_IE_MASK_HASH_DONE;
-	writel(stat, cryp->base + STARFIVE_IE_MASK_OFFSET);
 	writel(csr.v, cryp->base + STARFIVE_HASH_SHACSR);
 }
 
-static int starfive_hash_xmit_dma(struct starfive_cryp_ctx *ctx)
+static void starfive_hash_dma_callback(void *param)
 {
-	struct starfive_cryp_request_ctx *rctx = ctx->rctx;
-	struct starfive_cryp_dev *cryp = ctx->cryp;
-	struct dma_async_tx_descriptor	*in_desc;
-	union  starfive_alg_cr alg_cr;
-	int total_len;
-	int ret;
-
-	if (!rctx->total) {
-		starfive_hash_start(ctx);
-		return 0;
-	}
+	struct starfive_cryp_dev *cryp = param;
 
-	writel(rctx->total, cryp->base + STARFIVE_DMA_IN_LEN_OFFSET);
-
-	total_len = rctx->total;
-	total_len = (total_len & 0x3) ? (((total_len >> 2) + 1) << 2) : total_len;
-	sg_dma_len(rctx->in_sg) = total_len;
-
-	alg_cr.v = 0;
-	alg_cr.start = 1;
-	alg_cr.hash_dma_en = 1;
-
-	writel(alg_cr.v, cryp->base + STARFIVE_ALG_CR_OFFSET);
-
-	ret = dma_map_sg(cryp->dev, rctx->in_sg, rctx->in_sg_len, DMA_TO_DEVICE);
-	if (!ret)
-		return dev_err_probe(cryp->dev, -EINVAL, "dma_map_sg() error\n");
+	complete(&cryp->dma_done);
+}
 
-	cryp->cfg_in.direction = DMA_MEM_TO_DEV;
-	cryp->cfg_in.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+static void starfive_hash_dma_init(struct starfive_cryp_dev *cryp)
+{
+	cryp->cfg_in.src_addr_width = DMA_SLAVE_BUSWIDTH_16_BYTES;
 	cryp->cfg_in.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	cryp->cfg_in.src_maxburst = cryp->dma_maxburst;
 	cryp->cfg_in.dst_maxburst = cryp->dma_maxburst;
@@ -149,50 +118,48 @@ static int starfive_hash_xmit_dma(struct starfive_cryp_ctx *ctx)
 
 	dmaengine_slave_config(cryp->tx, &cryp->cfg_in);
 
-	in_desc = dmaengine_prep_slave_sg(cryp->tx, rctx->in_sg,
-					  ret, DMA_MEM_TO_DEV,
-					  DMA_PREP_INTERRUPT  |  DMA_CTRL_ACK);
-
-	if (!in_desc)
-		return -EINVAL;
-
-	in_desc->callback = starfive_hash_start;
-	in_desc->callback_param = ctx;
-
-	dmaengine_submit(in_desc);
-	dma_async_issue_pending(cryp->tx);
-
-	return 0;
+	init_completion(&cryp->dma_done);
 }
 
-static int starfive_hash_xmit(struct starfive_cryp_ctx *ctx)
+static int starfive_hash_dma_xfer(struct starfive_cryp_dev *cryp,
+				  struct scatterlist *sg)
 {
-	struct starfive_cryp_request_ctx *rctx = ctx->rctx;
-	struct starfive_cryp_dev *cryp = ctx->cryp;
+	struct dma_async_tx_descriptor *in_desc;
+	union starfive_alg_cr alg_cr;
 	int ret = 0;
 
-	rctx->csr.hash.v = 0;
-	rctx->csr.hash.reset = 1;
-	writel(rctx->csr.hash.v, cryp->base + STARFIVE_HASH_SHACSR);
-
-	if (starfive_hash_wait_busy(ctx))
-		return dev_err_probe(cryp->dev, -ETIMEDOUT, "Error resetting engine.\n");
+	alg_cr.v = 0;
+	alg_cr.start = 1;
+	alg_cr.hash_dma_en = 1;
+	writel(alg_cr.v, cryp->base + STARFIVE_ALG_CR_OFFSET);
 
-	rctx->csr.hash.v = 0;
-	rctx->csr.hash.mode = ctx->hash_mode;
-	rctx->csr.hash.ie = 1;
+	writel(sg_dma_len(sg), cryp->base + STARFIVE_DMA_IN_LEN_OFFSET);
+	sg_dma_len(sg) = ALIGN(sg_dma_len(sg), sizeof(u32));
 
-	if (ctx->is_hmac) {
-		ret = starfive_hash_hmac_key(ctx);
-		if (ret)
-			return ret;
-	} else {
-		rctx->csr.hash.start = 1;
-		rctx->csr.hash.firstb = 1;
-		writel(rctx->csr.hash.v, cryp->base + STARFIVE_HASH_SHACSR);
+	in_desc = dmaengine_prep_slave_sg(cryp->tx, sg, 1, DMA_MEM_TO_DEV,
+					  DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!in_desc) {
+		ret = -EINVAL;
+		goto end;
 	}
 
-	return starfive_hash_xmit_dma(ctx);
+	reinit_completion(&cryp->dma_done);
+	in_desc->callback = starfive_hash_dma_callback;
+	in_desc->callback_param = cryp;
+
+	dmaengine_submit(in_desc);
+	dma_async_issue_pending(cryp->tx);
+
+	if (!wait_for_completion_timeout(&cryp->dma_done,
+					 msecs_to_jiffies(1000)))
+		ret = -ETIMEDOUT;
+
+end:
+	alg_cr.v = 0;
+	alg_cr.clear = 1;
+	writel(alg_cr.v, cryp->base + STARFIVE_ALG_CR_OFFSET);
+
+	return ret;
 }
 
 static int starfive_hash_copy_hash(struct ahash_request *req)
@@ -215,58 +182,74 @@ static int starfive_hash_copy_hash(struct ahash_request *req)
 	return 0;
 }
 
-void starfive_hash_done_task(unsigned long param)
+static void starfive_hash_done_task(struct starfive_cryp_dev *cryp)
 {
-	struct starfive_cryp_dev *cryp = (struct starfive_cryp_dev *)param;
 	int err = cryp->err;
 
 	if (!err)
 		err = starfive_hash_copy_hash(cryp->req.hreq);
 
-	/* Reset to clear hash_done in irq register*/
-	writel(STARFIVE_HASH_RESET, cryp->base + STARFIVE_HASH_SHACSR);
-
 	crypto_finalize_hash_request(cryp->engine, cryp->req.hreq, err);
 }
 
-static int starfive_hash_check_aligned(struct scatterlist *sg, size_t total, size_t align)
+static int starfive_hash_one_request(struct crypto_engine *engine, void *areq)
 {
-	int len = 0;
+	struct ahash_request *req = container_of(areq, struct ahash_request,
+						 base);
+	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+	struct starfive_cryp_request_ctx *rctx = ctx->rctx;
+	struct starfive_cryp_dev *cryp = ctx->cryp;
+	struct scatterlist *tsg;
+	int ret, src_nents, i;
 
-	if (!total)
-		return 0;
+	writel(STARFIVE_HASH_RESET, cryp->base + STARFIVE_HASH_SHACSR);
 
-	if (!IS_ALIGNED(total, align))
-		return -EINVAL;
+	if (starfive_hash_wait_busy(cryp))
+		return dev_err_probe(cryp->dev, -ETIMEDOUT, "Error resetting hardware\n");
 
-	while (sg) {
-		if (!IS_ALIGNED(sg->offset, sizeof(u32)))
-			return -EINVAL;
+	rctx->csr.hash.v = 0;
+	rctx->csr.hash.mode = ctx->hash_mode;
 
-		if (!IS_ALIGNED(sg->length, align))
-			return -EINVAL;
+	if (ctx->is_hmac) {
+		ret = starfive_hash_hmac_key(ctx);
+		if (ret)
+			return ret;
+	} else {
+		rctx->csr.hash.start = 1;
+		rctx->csr.hash.firstb = 1;
+		writel(rctx->csr.hash.v, cryp->base + STARFIVE_HASH_SHACSR);
+	}
+
+	/* No input message, get digest and end. */
+	if (!rctx->total)
+		goto hash_start;
+
+	starfive_hash_dma_init(cryp);
+
+	for_each_sg(rctx->in_sg, tsg, rctx->in_sg_len, i) {
+		src_nents = dma_map_sg(cryp->dev, tsg, 1, DMA_TO_DEVICE);
+		if (src_nents == 0)
+			return dev_err_probe(cryp->dev, -ENOMEM,
+					     "dma_map_sg error\n");
 
-		len += sg->length;
-		sg = sg_next(sg);
+		ret = starfive_hash_dma_xfer(cryp, tsg);
+		dma_unmap_sg(cryp->dev, tsg, 1, DMA_TO_DEVICE);
+		if (ret)
+			return ret;
 	}
 
-	if (len != total)
-		return -EINVAL;
+hash_start:
+	starfive_hash_start(cryp);
 
-	return 0;
-}
+	if (starfive_hash_wait_busy(cryp))
+		return dev_err_probe(cryp->dev, -ETIMEDOUT, "Error generating digest\n");
 
-static int starfive_hash_one_request(struct crypto_engine *engine, void *areq)
-{
-	struct ahash_request *req = container_of(areq, struct ahash_request,
-						 base);
-	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
-	struct starfive_cryp_dev *cryp = ctx->cryp;
+	if (ctx->is_hmac)
+		cryp->err = starfive_hash_wait_hmac_done(cryp);
 
-	if (!cryp)
-		return -ENODEV;
+	starfive_hash_done_task(cryp);
 
-	return starfive_hash_xmit(ctx);
+	return 0;
 }
 
 static int starfive_hash_init(struct ahash_request *req)
@@ -337,22 +320,6 @@ static int starfive_hash_finup(struct ahash_request *req)
 	return crypto_ahash_finup(&rctx->ahash_fbk_req);
 }
 
-static int starfive_hash_digest_fb(struct ahash_request *req)
-{
-	struct starfive_cryp_request_ctx *rctx = ahash_request_ctx(req);
-	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
-	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(tfm);
-
-	ahash_request_set_tfm(&rctx->ahash_fbk_req, ctx->ahash_fbk);
-	ahash_request_set_callback(&rctx->ahash_fbk_req, req->base.flags,
-				   req->base.complete, req->base.data);
-
-	ahash_request_set_crypt(&rctx->ahash_fbk_req, req->src,
-				req->result, req->nbytes);
-
-	return crypto_ahash_digest(&rctx->ahash_fbk_req);
-}
-
 static int starfive_hash_digest(struct ahash_request *req)
 {
 	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
@@ -370,9 +337,6 @@ static int starfive_hash_digest(struct ahash_request *req)
 	rctx->in_sg_len = sg_nents_for_len(rctx->in_sg, rctx->total);
 	ctx->rctx = rctx;
 
-	if (starfive_hash_check_aligned(rctx->in_sg, rctx->total, rctx->blksize))
-		return starfive_hash_digest_fb(req);
-
 	return crypto_transfer_hash_request_to_engine(cryp->engine, req);
 }
 
@@ -406,7 +370,8 @@ static int starfive_hash_import(struct ahash_request *req, const void *in)
 
 static int starfive_hash_init_tfm(struct crypto_ahash *hash,
 				  const char *alg_name,
-				  unsigned int mode)
+				  unsigned int mode,
+				  bool is_hmac)
 {
 	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(hash);
 
@@ -426,7 +391,7 @@ static int starfive_hash_init_tfm(struct crypto_ahash *hash,
 	crypto_ahash_set_reqsize(hash, sizeof(struct starfive_cryp_request_ctx) +
 				 crypto_ahash_reqsize(ctx->ahash_fbk));
 
-	ctx->keylen = 0;
+	ctx->is_hmac = is_hmac;
 	ctx->hash_mode = mode;
 
 	return 0;
@@ -529,81 +494,61 @@ static int starfive_hash_setkey(struct crypto_ahash *hash,
 static int starfive_sha224_init_tfm(struct crypto_ahash *hash)
 {
 	return starfive_hash_init_tfm(hash, "sha224-generic",
-				      STARFIVE_HASH_SHA224);
+				      STARFIVE_HASH_SHA224, 0);
 }
 
 static int starfive_sha256_init_tfm(struct crypto_ahash *hash)
 {
 	return starfive_hash_init_tfm(hash, "sha256-generic",
-				      STARFIVE_HASH_SHA256);
+				      STARFIVE_HASH_SHA256, 0);
 }
 
 static int starfive_sha384_init_tfm(struct crypto_ahash *hash)
 {
 	return starfive_hash_init_tfm(hash, "sha384-generic",
-				      STARFIVE_HASH_SHA384);
+				      STARFIVE_HASH_SHA384, 0);
 }
 
 static int starfive_sha512_init_tfm(struct crypto_ahash *hash)
 {
 	return starfive_hash_init_tfm(hash, "sha512-generic",
-				      STARFIVE_HASH_SHA512);
+				      STARFIVE_HASH_SHA512, 0);
 }
 
 static int starfive_sm3_init_tfm(struct crypto_ahash *hash)
 {
 	return starfive_hash_init_tfm(hash, "sm3-generic",
-				      STARFIVE_HASH_SM3);
+				      STARFIVE_HASH_SM3, 0);
 }
 
 static int starfive_hmac_sha224_init_tfm(struct crypto_ahash *hash)
 {
-	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(hash);
-
-	ctx->is_hmac = true;
-
 	return starfive_hash_init_tfm(hash, "hmac(sha224-generic)",
-				      STARFIVE_HASH_SHA224);
+				      STARFIVE_HASH_SHA224, 1);
 }
 
 static int starfive_hmac_sha256_init_tfm(struct crypto_ahash *hash)
 {
-	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(hash);
-
-	ctx->is_hmac = true;
-
 	return starfive_hash_init_tfm(hash, "hmac(sha256-generic)",
-				      STARFIVE_HASH_SHA256);
+				      STARFIVE_HASH_SHA256, 1);
 }
 
 static int starfive_hmac_sha384_init_tfm(struct crypto_ahash *hash)
 {
-	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(hash);
-
-	ctx->is_hmac = true;
-
 	return starfive_hash_init_tfm(hash, "hmac(sha384-generic)",
-				      STARFIVE_HASH_SHA384);
+				      STARFIVE_HASH_SHA384, 1);
 }
 
 static int starfive_hmac_sha512_init_tfm(struct crypto_ahash *hash)
 {
-	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(hash);
-
-	ctx->is_hmac = true;
-
 	return starfive_hash_init_tfm(hash, "hmac(sha512-generic)",
-				      STARFIVE_HASH_SHA512);
+				      STARFIVE_HASH_SHA512, 1);
 }
 
 static int starfive_hmac_sm3_init_tfm(struct crypto_ahash *hash)
 {
-	struct starfive_cryp_ctx *ctx = crypto_ahash_ctx(hash);
-
-	ctx->is_hmac = true;
-
 	return starfive_hash_init_tfm(hash, "hmac(sm3-generic)",
-				      STARFIVE_HASH_SM3);
+				      STARFIVE_HASH_SM3, 1);
 }
 
 static struct ahash_engine_alg algs_sha2_sm3[] = {
-- 
2.34.1