crypto: sl3516 - Add sl3516 crypto engine (46c5338d) · Commits · EulixOS / Software / Kernel

drivers/crypto/Kconfig

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Original line number	Diff line number	Diff line
		@@ -266,6 +266,25 @@ config CRYPTO_DEV_NIAGARA2
		Group, which can perform encryption, decryption, hashing,
		checksumming, and raw copies.

		config CRYPTO_DEV_SL3516
		tristate "Stormlink SL3516 crypto offloader"
		select CRYPTO_SKCIPHER
		select CRYPTO_ENGINE
		select CRYPTO_ECB
		select CRYPTO_AES
		select HW_RANDOM
		help
		This option allows you to have support for SL3516 crypto offloader.

		config CRYPTO_DEV_SL3516_DEBUG
		bool "Enable SL3516 stats"
		depends on CRYPTO_DEV_SL3516
		depends on DEBUG_FS
		help
		Say y to enable SL3516 debug stats.
		This will create /sys/kernel/debug/sl3516/stats for displaying
		the number of requests per algorithm and other internal stats.

		config CRYPTO_DEV_HIFN_795X
		tristate "Driver HIFN 795x crypto accelerator chips"
		select CRYPTO_LIB_DES

drivers/crypto/Makefile

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Original line number	Diff line number	Diff line
		@@ -38,6 +38,7 @@ obj-$(CONFIG_CRYPTO_DEV_ROCKCHIP) += rockchip/
		obj-$(CONFIG_CRYPTO_DEV_S5P) += s5p-sss.o
		obj-$(CONFIG_CRYPTO_DEV_SA2UL) += sa2ul.o
		obj-$(CONFIG_CRYPTO_DEV_SAHARA) += sahara.o
		obj-$(CONFIG_CRYPTO_DEV_SL3516) += gemini/
		obj-$(CONFIG_ARCH_STM32) += stm32/
		obj-$(CONFIG_CRYPTO_DEV_TALITOS) += talitos.o
		obj-$(CONFIG_CRYPTO_DEV_UX500) += ux500/

drivers/crypto/gemini/Makefile

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Original line number	Diff line number	Diff line
		obj-$(CONFIG_CRYPTO_DEV_SL3516) += sl3516-ce.o
		sl3516-ce-y += sl3516-ce-core.o sl3516-ce-cipher.o sl3516-ce-rng.o

drivers/crypto/gemini/sl3516-ce-cipher.c

0 → 100644

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Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* sl3516-ce-cipher.c - hardware cryptographic offloader for Stormlink SL3516 SoC
		*
		* Copyright (C) 2021 Corentin LABBE <clabbe@baylibre.com>
		*
		* This file adds support for AES cipher with 128,192,256 bits keysize in
		* ECB mode.
		*/

		#include <linux/crypto.h>
		#include <linux/dma-mapping.h>
		#include <linux/delay.h>
		#include <linux/io.h>
		#include <linux/io.h>
		#include <linux/pm_runtime.h>
		#include <crypto/scatterwalk.h>
		#include <crypto/internal/skcipher.h>
		#include "sl3516-ce.h"

		/* sl3516_ce_need_fallback - check if a request can be handled by the CE */
		static bool sl3516_ce_need_fallback(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sl3516_ce_dev *ce = op->ce;
		struct scatterlist *in_sg = areq->src;
		struct scatterlist *out_sg = areq->dst;
		struct scatterlist *sg;

		if (areq->cryptlen == 0 \|\| areq->cryptlen % 16) {
		ce->fallback_mod16++;
		return true;
		}

		/*
		* check if we have enough descriptors for TX
		* Note: TX need one control desc for each SG
		*/
		if (sg_nents(areq->src) > MAXDESC / 2) {
		ce->fallback_sg_count_tx++;
		return true;
		}
		/* check if we have enough descriptors for RX */
		if (sg_nents(areq->dst) > MAXDESC) {
		ce->fallback_sg_count_rx++;
		return true;
		}

		sg = areq->src;
		while (sg) {
		if ((sg->length % 16) != 0) {
		ce->fallback_mod16++;
		return true;
		}
		if ((sg_dma_len(sg) % 16) != 0) {
		ce->fallback_mod16++;
		return true;
		}
		if (!IS_ALIGNED(sg->offset, 16)) {
		ce->fallback_align16++;
		return true;
		}
		sg = sg_next(sg);
		}
		sg = areq->dst;
		while (sg) {
		if ((sg->length % 16) != 0) {
		ce->fallback_mod16++;
		return true;
		}
		if ((sg_dma_len(sg) % 16) != 0) {
		ce->fallback_mod16++;
		return true;
		}
		if (!IS_ALIGNED(sg->offset, 16)) {
		ce->fallback_align16++;
		return true;
		}
		sg = sg_next(sg);
		}

		/* need same numbers of SG (with same length) for source and destination */
		in_sg = areq->src;
		out_sg = areq->dst;
		while (in_sg && out_sg) {
		if (in_sg->length != out_sg->length) {
		ce->fallback_not_same_len++;
		return true;
		}
		in_sg = sg_next(in_sg);
		out_sg = sg_next(out_sg);
		}
		if (in_sg \|\| out_sg)
		return true;

		return false;
		}

		static int sl3516_ce_cipher_fallback(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sl3516_ce_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
		struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
		struct sl3516_ce_alg_template *algt;
		int err;

		algt = container_of(alg, struct sl3516_ce_alg_template, alg.skcipher);
		algt->stat_fb++;

		skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
		skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
		areq->base.complete, areq->base.data);
		skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
		areq->cryptlen, areq->iv);
		if (rctx->op_dir == CE_DECRYPTION)
		err = crypto_skcipher_decrypt(&rctx->fallback_req);
		else
		err = crypto_skcipher_encrypt(&rctx->fallback_req);
		return err;
		}

		static int sl3516_ce_cipher(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sl3516_ce_dev *ce = op->ce;
		struct sl3516_ce_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
		struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
		struct sl3516_ce_alg_template *algt;
		struct scatterlist *sg;
		unsigned int todo, len;
		struct pkt_control_ecb *ecb;
		int nr_sgs = 0;
		int nr_sgd = 0;
		int err = 0;
		int i;

		algt = container_of(alg, struct sl3516_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);

		algt->stat_req++;

		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 > MAXDESC / 2) {
		dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
		err = -EINVAL;
		goto theend;
		}
		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 > MAXDESC / 2) {
		dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
		err = -EINVAL;
		goto theend;
		}
		nr_sgd = dma_map_sg(ce->dev, areq->dst, sg_nents(areq->dst),
		DMA_FROM_DEVICE);
		if (nr_sgd <= 0 \|\| nr_sgd > MAXDESC) {
		dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
		err = -EINVAL;
		goto theend_sgs;
		}
		}

		len = areq->cryptlen;
		i = 0;
		sg = areq->src;
		while (i < nr_sgs && sg && len) {
		if (sg_dma_len(sg) == 0)
		goto sgs_next;
		rctx->t_src[i].addr = sg_dma_address(sg);
		todo = min(len, sg_dma_len(sg));
		rctx->t_src[i].len = todo;
		dev_dbg(ce->dev, "%s total=%u SGS(%d %u off=%d) todo=%u\n", __func__,
		areq->cryptlen, i, rctx->t_src[i].len, sg->offset, todo);
		len -= todo;
		i++;
		sgs_next:
		sg = sg_next(sg);
		}
		if (len > 0) {
		dev_err(ce->dev, "remaining len %d/%u nr_sgs=%d\n", len, areq->cryptlen, nr_sgs);
		err = -EINVAL;
		goto theend_sgs;
		}

		len = areq->cryptlen;
		i = 0;
		sg = areq->dst;
		while (i < nr_sgd && sg && len) {
		if (sg_dma_len(sg) == 0)
		goto sgd_next;
		rctx->t_dst[i].addr = sg_dma_address(sg);
		todo = min(len, sg_dma_len(sg));
		rctx->t_dst[i].len = todo;
		dev_dbg(ce->dev, "%s total=%u SGD(%d %u off=%d) todo=%u\n", __func__,
		areq->cryptlen, i, rctx->t_dst[i].len, sg->offset, todo);
		len -= todo;
		i++;

		sgd_next:
		sg = sg_next(sg);
		}
		if (len > 0) {
		dev_err(ce->dev, "remaining len %d\n", len);
		err = -EINVAL;
		goto theend_sgs;
		}

		switch (algt->mode) {
		case ECB_AES:
		rctx->pctrllen = sizeof(struct pkt_control_ecb);
		ecb = (struct pkt_control_ecb *)ce->pctrl;

		rctx->tqflag = TQ0_TYPE_CTRL;
		rctx->tqflag \|= TQ1_CIPHER;
		ecb->control.op_mode = rctx->op_dir;
		ecb->control.cipher_algorithm = ECB_AES;
		ecb->cipher.header_len = 0;
		ecb->cipher.algorithm_len = areq->cryptlen;
		cpu_to_be32_array((__be32 )ecb->key, (u32 )op->key, op->keylen / 4);
		rctx->h = &ecb->cipher;

		rctx->tqflag \|= TQ4_KEY0;
		rctx->tqflag \|= TQ5_KEY4;
		rctx->tqflag \|= TQ6_KEY6;
		ecb->control.aesnk = op->keylen / 4;
		break;
		}

		rctx->nr_sgs = nr_sgs;
		rctx->nr_sgd = nr_sgd;
		err = sl3516_ce_run_task(ce, rctx, crypto_tfm_alg_name(areq->base.tfm));

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

		theend:

		return err;
		}

		static int sl3516_ce_handle_cipher_request(struct crypto_engine engine, void areq)
		{
		int err;
		struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);

		err = sl3516_ce_cipher(breq);
		crypto_finalize_skcipher_request(engine, breq, err);

		return 0;
		}

		int sl3516_ce_skdecrypt(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sl3516_ce_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
		struct crypto_engine *engine;

		memset(rctx, 0, sizeof(struct sl3516_ce_cipher_req_ctx));
		rctx->op_dir = CE_DECRYPTION;

		if (sl3516_ce_need_fallback(areq))
		return sl3516_ce_cipher_fallback(areq);

		engine = op->ce->engine;

		return crypto_transfer_skcipher_request_to_engine(engine, areq);
		}

		int sl3516_ce_skencrypt(struct skcipher_request *areq)
		{
		struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
		struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sl3516_ce_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
		struct crypto_engine *engine;

		memset(rctx, 0, sizeof(struct sl3516_ce_cipher_req_ctx));
		rctx->op_dir = CE_ENCRYPTION;

		if (sl3516_ce_need_fallback(areq))
		return sl3516_ce_cipher_fallback(areq);

		engine = op->ce->engine;

		return crypto_transfer_skcipher_request_to_engine(engine, areq);
		}

		int sl3516_ce_cipher_init(struct crypto_tfm *tfm)
		{
		struct sl3516_ce_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
		struct sl3516_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 sl3516_ce_cipher_tfm_ctx));

		algt = container_of(alg, struct sl3516_ce_alg_template, alg.skcipher);
		op->ce = algt->ce;

		op->fallback_tfm = crypto_alloc_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);
		}

		sktfm->reqsize = sizeof(struct sl3516_ce_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)));

		op->enginectx.op.do_one_request = sl3516_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:
		pm_runtime_put_noidle(op->ce->dev);
		crypto_free_skcipher(op->fallback_tfm);
		return err;
		}

		void sl3516_ce_cipher_exit(struct crypto_tfm *tfm)
		{
		struct sl3516_ce_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);

		kfree_sensitive(op->key);
		crypto_free_skcipher(op->fallback_tfm);
		pm_runtime_put_sync_suspend(op->ce->dev);
		}

		int sl3516_ce_aes_setkey(struct crypto_skcipher tfm, const u8 key,
		unsigned int keylen)
		{
		struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
		struct sl3516_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);
		return -EINVAL;
		}
		kfree_sensitive(op->key);
		op->keylen = keylen;
		op->key = kmemdup(key, keylen, GFP_KERNEL \| GFP_DMA);
		if (!op->key)
		return -ENOMEM;

		crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
		crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);

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

drivers/crypto/gemini/sl3516-ce-core.c

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File added.

Preview size limit exceeded, changes collapsed.