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Date: Tue, 7 Jun 2022 03:53:51 +0000
From: Neal Liu <neal_liu@...eedtech.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S . Miller" <davem@...emloft.net>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Joel Stanley <joel@....id.au>,
Andrew Jeffery <andrew@...id.au>,
Johnny Huang <johnny_huang@...eedtech.com>
CC: "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
BMC-SW <BMC-SW@...eedtech.com>
Subject: RE: [PATCH v2 5/5] crypto: aspeed: add HACE crypto driver
> Le 06/06/2022 à 08:49, Neal Liu a écrit :
> > Add HACE crypto driver to support symmetric-key encryption and
> > decryption with multiple modes of operation.
> >
> > Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> > Signed-off-by: Johnny Huang <johnny_huang@...eedtech.com>
> > ---
>
> [...]
>
> > +static int aspeed_sk_transfer_sg(struct aspeed_hace_dev *hace_dev) {
> > + struct aspeed_engine_crypto *crypto_engine =
> &hace_dev->crypto_engine;
> > + struct device *dev = hace_dev->dev;
> > + struct aspeed_cipher_reqctx *rctx;
> > + struct skcipher_request *req;
> > +
> > + CIPHER_DBG(hace_dev, "\n");
> > +
> > + req = skcipher_request_cast(crypto_engine->areq);
> > + rctx = skcipher_request_ctx(req);
> > +
> > + if (req->src == req->dst) {
> > + dma_unmap_sg(dev, req->src, rctx->src_nents,
> DMA_BIDIRECTIONAL);
> > +
>
> Unneeded empty line.
Okay !
>
> > + } else {
> > + dma_unmap_sg(dev, req->src, rctx->src_nents, DMA_TO_DEVICE);
> > + dma_unmap_sg(dev, req->dst, rctx->dst_nents,
> DMA_FROM_DEVICE);
> > + }
> > +
> > + return aspeed_sk_complete(hace_dev, 0); }
> > +
>
> [...]
>
> > +static int aspeed_sk_start_sg(struct aspeed_hace_dev *hace_dev) {
> > + struct aspeed_engine_crypto *crypto_engine =
> &hace_dev->crypto_engine;
> > + struct aspeed_sg_list *src_list, *dst_list;
> > + dma_addr_t src_dma_addr, dst_dma_addr;
> > + struct aspeed_cipher_reqctx *rctx;
> > + struct skcipher_request *req;
> > + struct scatterlist *s;
> > + int src_sg_len;
> > + int dst_sg_len;
> > + int total, i;
> > + int rc;
> > +
> > + CIPHER_DBG(hace_dev, "\n");
> > +
> > + req = skcipher_request_cast(crypto_engine->areq);
> > + rctx = skcipher_request_ctx(req);
> > +
> > + rctx->enc_cmd |= HACE_CMD_DES_SG_CTRL |
> HACE_CMD_SRC_SG_CTRL |
> > + HACE_CMD_AES_KEY_HW_EXP |
> HACE_CMD_MBUS_REQ_SYNC_EN;
> > +
> > + /* BIDIRECTIONAL */
> > + if (req->dst == req->src) {
> > + src_sg_len = dma_map_sg(hace_dev->dev, req->src,
> > + rctx->src_nents, DMA_BIDIRECTIONAL);
> > + dst_sg_len = src_sg_len;
> > + if (!src_sg_len) {
> > + dev_warn(hace_dev->dev, "dma_map_sg() src error\n");
> > + return -EINVAL;
> > + }
> > +
> > + } else {
> > + src_sg_len = dma_map_sg(hace_dev->dev, req->src,
> > + rctx->src_nents, DMA_TO_DEVICE);
> > + if (!src_sg_len) {
> > + dev_warn(hace_dev->dev, "dma_map_sg() src error\n");
> > + return -EINVAL;
> > + }
> > +
> > + dst_sg_len = dma_map_sg(hace_dev->dev, req->dst,
> > + rctx->dst_nents, DMA_FROM_DEVICE);
> > + if (!dst_sg_len) {
> > + dev_warn(hace_dev->dev, "dma_map_sg() dst error\n");
> > + rc = -EINVAL;
> > + goto free_req_src;
>
> Should we realy call dma_unmap_sg() if dma_map_sg() fails?
This error handling is unmap() the above buffer (req->src), not really this buffer (req->dst).
I think it should.
>
> > + }
> > + }
> > +
> > + src_list = (struct aspeed_sg_list *)crypto_engine->cipher_addr;
> > + src_dma_addr = crypto_engine->cipher_dma_addr;
> > + total = req->cryptlen;
> > +
> > + for_each_sg(req->src, s, src_sg_len, i) {
> > + src_list[i].phy_addr = sg_dma_address(s);
> > +
> > + /* last sg list */
> > + if (sg_dma_len(s) >= total) {
> > + src_list[i].len = total;
> > + src_list[i].len |= BIT(31);
> > + total = 0;
> > + break;
> > + }
> > +
> > + src_list[i].len = sg_dma_len(s);
> > + total -= src_list[i].len;
> > + }
> > +
> > + if (total != 0)
> > + return -EINVAL;
>
> goto free_req_src; ?
Yes, I miss this part. I'll revise it in next patch, thanks.
>
> > +
> > + if (req->dst == req->src) {
> > + dst_list = src_list;
> > + dst_dma_addr = src_dma_addr;
> > +
> > + } else {
> > + dst_list = (struct aspeed_sg_list *)crypto_engine->dst_sg_addr;
> > + dst_dma_addr = crypto_engine->dst_sg_dma_addr;
> > + total = req->cryptlen;
> > +
> > + for_each_sg(req->dst, s, dst_sg_len, i) {
> > + dst_list[i].phy_addr = sg_dma_address(s);
> > +
> > + /* last sg list */
> > + if (sg_dma_len(s) >= total) {
> > + dst_list[i].len = total;
> > + dst_list[i].len |= BIT(31);
> > + total = 0;
> > + break;
> > + }
> > +
> > + dst_list[i].len = sg_dma_len(s);
> > + total -= dst_list[i].len;
> > + }
> > +
> > + dst_list[dst_sg_len].phy_addr = 0;
> > + dst_list[dst_sg_len].len = 0;
> > + }
> > +
> > + if (total != 0)
> > + return -EINVAL;
> > +
> > + crypto_engine->resume = aspeed_sk_transfer_sg;
> > +
> > + /* Dummy read for barriers */
> > + readl(src_list);
> > + readl(dst_list);
> > +
> > + /* Trigger engines */
> > + ast_hace_write(hace_dev, src_dma_addr, ASPEED_HACE_SRC);
> > + ast_hace_write(hace_dev, dst_dma_addr, ASPEED_HACE_DEST);
> > + ast_hace_write(hace_dev, req->cryptlen, ASPEED_HACE_DATA_LEN);
> > + ast_hace_write(hace_dev, rctx->enc_cmd, ASPEED_HACE_CMD);
> > +
> > + return -EINPROGRESS;
> > +
> > +free_req_src:
> > + dma_unmap_sg(hace_dev->dev, req->src, rctx->src_nents,
> > +DMA_TO_DEVICE);
> > +
> > + return rc;
> > +}
> > +
>
> [...]
>
> > +static int aspeed_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
> > + unsigned int keylen)
> > +{
> > + struct aspeed_cipher_ctx *ctx = crypto_skcipher_ctx(cipher);
> > + struct aspeed_hace_dev *hace_dev = ctx->hace_dev;
> > + struct crypto_aes_ctx gen_aes_key;
> > +
> > + CIPHER_DBG(hace_dev, "keylen: %d bits\n", (keylen * 8));
> > +
> > + if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
> > + keylen != AES_KEYSIZE_256)
> > + return -EINVAL;
> > +
> > + if (ctx->hace_dev->version == AST2500_VERSION) {
> > + aes_expandkey(&gen_aes_key, key, keylen);
> > + memcpy(ctx->key, gen_aes_key.key_enc, AES_MAX_KEYLENGTH);
> > +
>
> Unneeded empty line
Okay !
>
> > + } else {
> > + memcpy(ctx->key, key, keylen);
> > + }
> > +
> > + ctx->key_len = keylen;
> > +
> > + return 0;
> > +}
> > +
>
> [...]
>
> > + crypto_engine->cipher_ctx =
> > + dma_alloc_coherent(&pdev->dev,
> > + PAGE_SIZE,
> > + &crypto_engine->cipher_ctx_dma,
> > + GFP_KERNEL);
> > + if (!crypto_engine->cipher_ctx) {
> > + dev_err(&pdev->dev, "Failed to allocate cipher ctx dma\n");
> > + rc = -ENOMEM;
> > + goto free_hash_src;
> > + }
> > +
> > + crypto_engine->cipher_addr =
> > + dma_alloc_coherent(&pdev->dev,
> > + ASPEED_CRYPTO_SRC_DMA_BUF_LEN,
> > + &crypto_engine->cipher_dma_addr,
> > + GFP_KERNEL);
> > + if (!crypto_engine->cipher_addr) {
> > + dev_err(&pdev->dev, "Failed to allocate cipher addr dma\n");
> > + rc = -ENOMEM;
> > + goto free_cipher_ctx;
> > + }
> > +
> > + if (hace_dev->version == AST2600_VERSION) {
> > + crypto_engine->dst_sg_addr =
> > + dma_alloc_coherent(&pdev->dev,
> > + ASPEED_CRYPTO_DST_DMA_BUF_LEN,
> > + &crypto_engine->dst_sg_dma_addr,
> > + GFP_KERNEL);
> > + if (!crypto_engine->dst_sg_addr) {
> > + dev_err(&pdev->dev, "Failed to allocate dst_sg dma\n");
> > + rc = -ENOMEM;
> > + goto free_cipher_addr;
> > + }
> > + }
> > +
> > rc = aspeed_hace_register(hace_dev);
> > if (rc) {
> > dev_err(&pdev->dev, "Failed to register algs, rc:0x%x\n", rc);
>
> I guess that the new dma_alloc_coherent() just a few lines above should also
> be undone in error hanfling path if aspeed_hace_register() fails?
I'll remove the return value (rc) since it's useless here. So no need error handling on this part.
I'll revise it in next patch, thanks.
>
> > @@ -179,6 +282,18 @@ static int aspeed_hace_probe(struct
> > platform_device *pdev)
> >
> > return 0;
> >
> > +free_cipher_addr:
> > + dma_free_coherent(&pdev->dev, ASPEED_CRYPTO_SRC_DMA_BUF_LEN,
> > + crypto_engine->cipher_addr,
> > + crypto_engine->cipher_dma_addr);
> > +free_cipher_ctx:
> > + dma_free_coherent(&pdev->dev, PAGE_SIZE,
> > + crypto_engine->cipher_ctx,
> > + crypto_engine->cipher_ctx_dma);
> > +free_hash_src:
> > + dma_free_coherent(&pdev->dev, ASPEED_HASH_SRC_DMA_BUF_LEN,
> > + hash_engine->ahash_src_addr,
> > + hash_engine->ahash_src_dma_addr);
> > end:
> > clk_disable_unprepare(hace_dev->clk);
> > return rc;
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