crypto: allwinner - Add sun8i-ce Crypto Engine (06f751b6) · Commits · 戴 / test

drivers/crypto/allwinner/Kconfig

+27 −0

Original line number	Diff line number	Diff line
		@@ -4,3 +4,30 @@ config CRYPTO_DEV_ALLWINNER
		default y if ARCH_SUNXI
		help
		Say Y here to get to see options for Allwinner hardware crypto devices

		config CRYPTO_DEV_SUN8I_CE
		tristate "Support for Allwinner Crypto Engine cryptographic offloader"
		select CRYPTO_BLKCIPHER
		select CRYPTO_ENGINE
		select CRYPTO_ECB
		select CRYPTO_CBC
		select CRYPTO_AES
		select CRYPTO_DES
		depends on CRYPTO_DEV_ALLWINNER
		depends on PM
		help
		Select y here to have support for the crypto Engine availlable on
		Allwinner SoC H2+, H3, H5, H6, R40 and A64.
		The Crypto Engine handle AES/3DES ciphers in ECB/CBC mode.

		To compile this driver as a module, choose M here: the module
		will be called sun8i-ce.

		config CRYPTO_DEV_SUN8I_CE_DEBUG
		bool "Enable sun8i-ce stats"
		depends on CRYPTO_DEV_SUN8I_CE
		depends on DEBUG_FS
		help
		Say y to enable sun8i-ce debug stats.
		This will create /sys/kernel/debug/sun8i-ce/stats for displaying
		the number of requests per flow and per algorithm.

drivers/crypto/allwinner/Makefile

0 → 100644

+1 −0

Original line number	Diff line number	Diff line
		obj-$(CONFIG_CRYPTO_DEV_SUN8I_CE) += sun8i-ce/

drivers/crypto/allwinner/sun8i-ce/Makefile

0 → 100644

+2 −0

Original line number	Diff line number	Diff line
		obj-$(CONFIG_CRYPTO_DEV_SUN8I_CE) += sun8i-ce.o
		sun8i-ce-y += sun8i-ce-core.o sun8i-ce-cipher.o

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

0 → 100644

+434 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* sun8i-ce-cipher.c - hardware cryptographic offloader for
		* Allwinner H3/A64/H5/H2+/H6/R40 SoC
		*
		* Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
		*
		* This file add support for AES cipher with 128,192,256 bits keysize in
		* CBC and ECB mode.
		*
		* You could find a link for the datasheet in Documentation/arm/sunxi/README
		*/

		#include <linux/crypto.h>
		#include <linux/dma-mapping.h>
		#include <linux/io.h>
		#include <linux/pm_runtime.h>
		#include <crypto/scatterwalk.h>
		#include <crypto/internal/des.h>
		#include <crypto/internal/skcipher.h>
		#include "sun8i-ce.h"

		static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct scatterlist *sg;

		if (sg_nents(areq->src) > MAX_SG \|\| sg_nents(areq->dst) > MAX_SG)
		return true;

		if (areq->cryptlen < crypto_skcipher_ivsize(tfm))
		return true;

		if (areq->cryptlen == 0 \|\| areq->cryptlen % 16)
		return true;

		sg = areq->src;
		while (sg) {
		if (sg->length % 4 \|\| !IS_ALIGNED(sg->offset, sizeof(u32)))
		return true;
		sg = sg_next(sg);
		}
		sg = areq->dst;
		while (sg) {
		if (sg->length % 4 \|\| !IS_ALIGNED(sg->offset, sizeof(u32)))
		return true;
		sg = sg_next(sg);
		}
		return false;
		}

		static int sun8i_ce_cipher_fallback(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
		int err;
		#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
		struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
		struct sun8i_ce_alg_template *algt;
		#endif
		SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, op->fallback_tfm);

		#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
		algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
		algt->stat_fb++;
		#endif

		skcipher_request_set_sync_tfm(subreq, op->fallback_tfm);
		skcipher_request_set_callback(subreq, areq->base.flags, NULL, NULL);
		skcipher_request_set_crypt(subreq, areq->src, areq->dst,
		areq->cryptlen, areq->iv);
		if (rctx->op_dir & CE_DECRYPTION)
		err = crypto_skcipher_decrypt(subreq);
		else
		err = crypto_skcipher_encrypt(subreq);
		skcipher_request_zero(subreq);
		return err;
		}

		static int sun8i_ce_cipher(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sun8i_ce_dev *ce = op->ce;
		struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
		struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
		struct sun8i_ce_alg_template *algt;
		struct sun8i_ce_flow *chan;
		struct ce_task *cet;
		struct scatterlist *sg;
		unsigned int todo, len, offset, ivsize;
		void *backup_iv = NULL;
		int flow, i;
		int nr_sgs = 0;
		int nr_sgd = 0;
		int err = 0;

		algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);

		dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
		crypto_tfm_alg_name(areq->base.tfm),
		areq->cryptlen,
		rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
		op->keylen);

		#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
		algt->stat_req++;
		#endif

		flow = rctx->flow;

		chan = &ce->chanlist[flow];

		cet = chan->tl;
		memset(cet, 0, sizeof(struct ce_task));

		cet->t_id = flow;
		cet->t_common_ctl = ce->variant->alg_cipher[algt->ce_algo_id];
		cet->t_common_ctl \|= rctx->op_dir \| CE_COMM_INT;
		cet->t_dlen = areq->cryptlen / 4;
		/* CTS and recent CE (H6) need length in bytes, in word otherwise */
		if (ce->variant->has_t_dlen_in_bytes)
		cet->t_dlen = areq->cryptlen;

		cet->t_sym_ctl = ce->variant->op_mode[algt->ce_blockmode];
		len = op->keylen;
		switch (len) {
		case 128 / 8:
		cet->t_sym_ctl \|= CE_AES_128BITS;
		break;
		case 192 / 8:
		cet->t_sym_ctl \|= CE_AES_192BITS;
		break;
		case 256 / 8:
		cet->t_sym_ctl \|= CE_AES_256BITS;
		break;
		}

		cet->t_asym_ctl = 0;

		chan->op_mode = ce->variant->op_mode[algt->ce_blockmode];
		chan->op_dir = rctx->op_dir;
		chan->method = ce->variant->alg_cipher[algt->ce_algo_id];
		chan->keylen = op->keylen;

		cet->t_key = dma_map_single(ce->dev, op->key, op->keylen,
		DMA_TO_DEVICE);
		if (dma_mapping_error(ce->dev, cet->t_key)) {
		dev_err(ce->dev, "Cannot DMA MAP KEY\n");
		err = -EFAULT;
		goto theend;
		}

		ivsize = crypto_skcipher_ivsize(tfm);
		if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
		chan->ivlen = ivsize;
		chan->bounce_iv = kzalloc(ivsize, GFP_KERNEL \| GFP_DMA);
		if (!chan->bounce_iv) {
		err = -ENOMEM;
		goto theend_key;
		}
		if (rctx->op_dir & CE_DECRYPTION) {
		backup_iv = kzalloc(ivsize, GFP_KERNEL);
		if (!backup_iv) {
		err = -ENOMEM;
		goto theend_key;
		}
		offset = areq->cryptlen - ivsize;
		scatterwalk_map_and_copy(backup_iv, areq->src, offset,
		ivsize, 0);
		}
		memcpy(chan->bounce_iv, areq->iv, ivsize);
		cet->t_iv = dma_map_single(ce->dev, chan->bounce_iv,
		chan->ivlen, DMA_TO_DEVICE);
		if (dma_mapping_error(ce->dev, cet->t_iv)) {
		dev_err(ce->dev, "Cannot DMA MAP IV\n");
		err = -ENOMEM;
		goto theend_iv;
		}
		}

		if (areq->src == areq->dst) {
		nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
		DMA_BIDIRECTIONAL);
		if (nr_sgs <= 0 \|\| nr_sgs > MAX_SG) {
		dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
		err = -EINVAL;
		goto theend_iv;
		}
		nr_sgd = nr_sgs;
		} else {
		nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
		DMA_TO_DEVICE);
		if (nr_sgs <= 0 \|\| nr_sgs > MAX_SG) {
		dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
		err = -EINVAL;
		goto theend_iv;
		}
		nr_sgd = dma_map_sg(ce->dev, areq->dst, sg_nents(areq->dst),
		DMA_FROM_DEVICE);
		if (nr_sgd <= 0 \|\| nr_sgd > MAX_SG) {
		dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
		err = -EINVAL;
		goto theend_sgs;
		}
		}

		len = areq->cryptlen;
		for_each_sg(areq->src, sg, nr_sgs, i) {
		cet->t_src[i].addr = sg_dma_address(sg);
		todo = min(len, sg_dma_len(sg));
		cet->t_src[i].len = todo / 4;
		dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
		areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo);
		len -= todo;
		}
		if (len > 0) {
		dev_err(ce->dev, "remaining len %d\n", len);
		err = -EINVAL;
		goto theend_sgs;
		}

		len = areq->cryptlen;
		for_each_sg(areq->dst, sg, nr_sgd, i) {
		cet->t_dst[i].addr = sg_dma_address(sg);
		todo = min(len, sg_dma_len(sg));
		cet->t_dst[i].len = todo / 4;
		dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
		areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo);
		len -= todo;
		}
		if (len > 0) {
		dev_err(ce->dev, "remaining len %d\n", len);
		err = -EINVAL;
		goto theend_sgs;
		}

		chan->timeout = areq->cryptlen;
		err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(areq->base.tfm));

		theend_sgs:
		if (areq->src == areq->dst) {
		dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
		} else {
		if (nr_sgs > 0)
		dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
		dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE);
		}

		theend_iv:
		if (areq->iv && ivsize > 0) {
		if (cet->t_iv)
		dma_unmap_single(ce->dev, cet->t_iv, chan->ivlen,
		DMA_TO_DEVICE);
		offset = areq->cryptlen - ivsize;
		if (rctx->op_dir & CE_DECRYPTION) {
		memcpy(areq->iv, backup_iv, ivsize);
		kzfree(backup_iv);
		} else {
		scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
		ivsize, 0);
		}
		kfree(chan->bounce_iv);
		}

		theend_key:
		dma_unmap_single(ce->dev, cet->t_key, op->keylen, DMA_TO_DEVICE);

		theend:
		return err;
		}

		static int sun8i_ce_handle_cipher_request(struct crypto_engine engine, void areq)
		{
		int err;
		struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);

		err = sun8i_ce_cipher(breq);
		crypto_finalize_skcipher_request(engine, breq, err);

		return 0;
		}

		int sun8i_ce_skdecrypt(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
		struct crypto_engine *engine;
		int e;

		rctx->op_dir = CE_DECRYPTION;
		if (sun8i_ce_cipher_need_fallback(areq))
		return sun8i_ce_cipher_fallback(areq);

		e = sun8i_ce_get_engine_number(op->ce);
		rctx->flow = e;
		engine = op->ce->chanlist[e].engine;

		return crypto_transfer_skcipher_request_to_engine(engine, areq);
		}

		int sun8i_ce_skencrypt(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
		struct crypto_engine *engine;
		int e;

		rctx->op_dir = CE_ENCRYPTION;
		if (sun8i_ce_cipher_need_fallback(areq))
		return sun8i_ce_cipher_fallback(areq);

		e = sun8i_ce_get_engine_number(op->ce);
		rctx->flow = e;
		engine = op->ce->chanlist[e].engine;

		return crypto_transfer_skcipher_request_to_engine(engine, areq);
		}

		int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
		{
		struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
		struct sun8i_ce_alg_template *algt;
		const char *name = crypto_tfm_alg_name(tfm);
		struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
		struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
		int err;

		memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));

		algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
		op->ce = algt->ce;

		sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx);

		op->fallback_tfm = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
		if (IS_ERR(op->fallback_tfm)) {
		dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
		name, PTR_ERR(op->fallback_tfm));
		return PTR_ERR(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->base)));

		op->enginectx.op.do_one_request = sun8i_ce_handle_cipher_request;
		op->enginectx.op.prepare_request = NULL;
		op->enginectx.op.unprepare_request = NULL;

		err = pm_runtime_get_sync(op->ce->dev);
		if (err < 0)
		goto error_pm;

		return 0;
		error_pm:
		crypto_free_sync_skcipher(op->fallback_tfm);
		return err;
		}

		void sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
		{
		struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);

		if (op->key) {
		memzero_explicit(op->key, op->keylen);
		kfree(op->key);
		}
		crypto_free_sync_skcipher(op->fallback_tfm);
		pm_runtime_put_sync_suspend(op->ce->dev);
		}

		int sun8i_ce_aes_setkey(struct crypto_skcipher tfm, const u8 key,
		unsigned int keylen)
		{
		struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sun8i_ce_dev *ce = op->ce;

		switch (keylen) {
		case 128 / 8:
		break;
		case 192 / 8:
		break;
		case 256 / 8:
		break;
		default:
		dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen);
		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
		}
		if (op->key) {
		memzero_explicit(op->key, op->keylen);
		kfree(op->key);
		}
		op->keylen = keylen;
		op->key = kmalloc(keylen, GFP_KERNEL \| GFP_DMA);
		if (!op->key)
		return -ENOMEM;
		memcpy(op->key, key, keylen);

		crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
		crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);

		return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);
		}

		int sun8i_ce_des3_setkey(struct crypto_skcipher tfm, const u8 key,
		unsigned int keylen)
		{
		struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		int err;

		err = verify_skcipher_des3_key(tfm, key);
		if (err)
		return err;

		if (op->key) {
		memzero_explicit(op->key, op->keylen);
		kfree(op->key);
		}
		op->keylen = keylen;
		op->key = kmalloc(keylen, GFP_KERNEL \| GFP_DMA);
		if (!op->key)
		return -ENOMEM;
		memcpy(op->key, key, keylen);

		crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
		crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);

		return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);
		}

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

0 → 100644

+676 −0

File added.

Preview size limit exceeded, changes collapsed.

Admin message