500 lines
14 KiB
C
500 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* sun8i-ce-cipher.c - hardware cryptographic offloader for
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* Allwinner H3/A64/H5/H2+/H6/R40 SoC
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*
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* Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
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*
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* This file add support for AES cipher with 128,192,256 bits keysize in
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* CBC and ECB mode.
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*
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* You could find a link for the datasheet in Documentation/arm/sunxi.rst
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*/
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#include <linux/bottom_half.h>
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#include <linux/crypto.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/pm_runtime.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/internal/des.h>
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#include <crypto/internal/skcipher.h>
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#include "sun8i-ce.h"
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static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
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struct scatterlist *sg;
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
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struct sun8i_ce_alg_template *algt;
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unsigned int todo, len;
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algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
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if (sg_nents_for_len(areq->src, areq->cryptlen) > MAX_SG ||
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sg_nents_for_len(areq->dst, areq->cryptlen) > MAX_SG) {
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algt->stat_fb_maxsg++;
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return true;
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}
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if (areq->cryptlen < crypto_skcipher_ivsize(tfm)) {
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algt->stat_fb_leniv++;
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return true;
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}
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if (areq->cryptlen == 0) {
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algt->stat_fb_len0++;
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return true;
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}
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if (areq->cryptlen % 16) {
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algt->stat_fb_mod16++;
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return true;
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}
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len = areq->cryptlen;
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sg = areq->src;
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while (sg) {
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if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
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algt->stat_fb_srcali++;
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return true;
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}
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todo = min(len, sg->length);
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if (todo % 4) {
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algt->stat_fb_srclen++;
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return true;
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}
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len -= todo;
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sg = sg_next(sg);
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}
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len = areq->cryptlen;
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sg = areq->dst;
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while (sg) {
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if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
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algt->stat_fb_dstali++;
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return true;
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}
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todo = min(len, sg->length);
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if (todo % 4) {
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algt->stat_fb_dstlen++;
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return true;
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}
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len -= todo;
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sg = sg_next(sg);
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}
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return false;
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}
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static int sun8i_ce_cipher_fallback(struct skcipher_request *areq)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
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int err;
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#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
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struct sun8i_ce_alg_template *algt;
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algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
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algt->stat_fb++;
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#endif
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skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
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skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
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areq->base.complete, areq->base.data);
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skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
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areq->cryptlen, areq->iv);
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if (rctx->op_dir & CE_DECRYPTION)
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err = crypto_skcipher_decrypt(&rctx->fallback_req);
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else
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err = crypto_skcipher_encrypt(&rctx->fallback_req);
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return err;
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}
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static int sun8i_ce_cipher_prepare(struct crypto_engine *engine, void *async_req)
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{
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struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base);
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
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struct sun8i_ce_dev *ce = op->ce;
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
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struct sun8i_ce_alg_template *algt;
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struct sun8i_ce_flow *chan;
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struct ce_task *cet;
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struct scatterlist *sg;
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unsigned int todo, len, offset, ivsize;
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u32 common, sym;
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int flow, i;
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int nr_sgs = 0;
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int nr_sgd = 0;
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int err = 0;
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int ns = sg_nents_for_len(areq->src, areq->cryptlen);
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int nd = sg_nents_for_len(areq->dst, areq->cryptlen);
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algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
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dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
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crypto_tfm_alg_name(areq->base.tfm),
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areq->cryptlen,
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rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
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op->keylen);
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#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
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algt->stat_req++;
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#endif
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flow = rctx->flow;
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chan = &ce->chanlist[flow];
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cet = chan->tl;
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memset(cet, 0, sizeof(struct ce_task));
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cet->t_id = cpu_to_le32(flow);
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common = ce->variant->alg_cipher[algt->ce_algo_id];
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common |= rctx->op_dir | CE_COMM_INT;
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cet->t_common_ctl = cpu_to_le32(common);
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/* CTS and recent CE (H6) need length in bytes, in word otherwise */
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if (ce->variant->cipher_t_dlen_in_bytes)
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cet->t_dlen = cpu_to_le32(areq->cryptlen);
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else
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cet->t_dlen = cpu_to_le32(areq->cryptlen / 4);
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sym = ce->variant->op_mode[algt->ce_blockmode];
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len = op->keylen;
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switch (len) {
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case 128 / 8:
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sym |= CE_AES_128BITS;
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break;
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case 192 / 8:
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sym |= CE_AES_192BITS;
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break;
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case 256 / 8:
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sym |= CE_AES_256BITS;
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break;
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}
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cet->t_sym_ctl = cpu_to_le32(sym);
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cet->t_asym_ctl = 0;
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rctx->addr_key = dma_map_single(ce->dev, op->key, op->keylen, DMA_TO_DEVICE);
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if (dma_mapping_error(ce->dev, rctx->addr_key)) {
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dev_err(ce->dev, "Cannot DMA MAP KEY\n");
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err = -EFAULT;
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goto theend;
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}
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cet->t_key = cpu_to_le32(rctx->addr_key);
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ivsize = crypto_skcipher_ivsize(tfm);
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if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
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rctx->ivlen = ivsize;
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if (rctx->op_dir & CE_DECRYPTION) {
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offset = areq->cryptlen - ivsize;
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scatterwalk_map_and_copy(chan->backup_iv, areq->src,
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offset, ivsize, 0);
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}
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memcpy(chan->bounce_iv, areq->iv, ivsize);
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rctx->addr_iv = dma_map_single(ce->dev, chan->bounce_iv, rctx->ivlen,
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DMA_TO_DEVICE);
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if (dma_mapping_error(ce->dev, rctx->addr_iv)) {
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dev_err(ce->dev, "Cannot DMA MAP IV\n");
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err = -ENOMEM;
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goto theend_iv;
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}
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cet->t_iv = cpu_to_le32(rctx->addr_iv);
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}
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if (areq->src == areq->dst) {
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nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_BIDIRECTIONAL);
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if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
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dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
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err = -EINVAL;
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goto theend_iv;
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}
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nr_sgd = nr_sgs;
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} else {
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nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
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if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
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dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
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err = -EINVAL;
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goto theend_iv;
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}
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nr_sgd = dma_map_sg(ce->dev, areq->dst, nd, DMA_FROM_DEVICE);
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if (nr_sgd <= 0 || nr_sgd > MAX_SG) {
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dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
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err = -EINVAL;
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goto theend_sgs;
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}
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}
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len = areq->cryptlen;
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for_each_sg(areq->src, sg, nr_sgs, i) {
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cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg));
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todo = min(len, sg_dma_len(sg));
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cet->t_src[i].len = cpu_to_le32(todo / 4);
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dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
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areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo);
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len -= todo;
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}
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if (len > 0) {
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dev_err(ce->dev, "remaining len %d\n", len);
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err = -EINVAL;
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goto theend_sgs;
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}
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len = areq->cryptlen;
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for_each_sg(areq->dst, sg, nr_sgd, i) {
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cet->t_dst[i].addr = cpu_to_le32(sg_dma_address(sg));
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todo = min(len, sg_dma_len(sg));
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cet->t_dst[i].len = cpu_to_le32(todo / 4);
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dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
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areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo);
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len -= todo;
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}
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if (len > 0) {
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dev_err(ce->dev, "remaining len %d\n", len);
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err = -EINVAL;
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goto theend_sgs;
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}
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chan->timeout = areq->cryptlen;
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rctx->nr_sgs = nr_sgs;
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rctx->nr_sgd = nr_sgd;
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return 0;
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theend_sgs:
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if (areq->src == areq->dst) {
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dma_unmap_sg(ce->dev, areq->src, ns, DMA_BIDIRECTIONAL);
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} else {
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if (nr_sgs > 0)
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dma_unmap_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
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dma_unmap_sg(ce->dev, areq->dst, nd, DMA_FROM_DEVICE);
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}
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theend_iv:
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if (areq->iv && ivsize > 0) {
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if (rctx->addr_iv)
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dma_unmap_single(ce->dev, rctx->addr_iv, rctx->ivlen, DMA_TO_DEVICE);
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offset = areq->cryptlen - ivsize;
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if (rctx->op_dir & CE_DECRYPTION) {
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memcpy(areq->iv, chan->backup_iv, ivsize);
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memzero_explicit(chan->backup_iv, ivsize);
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} else {
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scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
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ivsize, 0);
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}
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memzero_explicit(chan->bounce_iv, ivsize);
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}
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dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE);
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theend:
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return err;
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}
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static int sun8i_ce_cipher_run(struct crypto_engine *engine, void *areq)
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{
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struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(breq);
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
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struct sun8i_ce_dev *ce = op->ce;
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(breq);
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int flow, err;
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flow = rctx->flow;
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err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(breq->base.tfm));
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local_bh_disable();
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crypto_finalize_skcipher_request(engine, breq, err);
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local_bh_enable();
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return 0;
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}
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static int sun8i_ce_cipher_unprepare(struct crypto_engine *engine, void *async_req)
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{
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struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base);
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
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struct sun8i_ce_dev *ce = op->ce;
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
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struct sun8i_ce_flow *chan;
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struct ce_task *cet;
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unsigned int ivsize, offset;
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int nr_sgs = rctx->nr_sgs;
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int nr_sgd = rctx->nr_sgd;
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int flow;
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flow = rctx->flow;
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chan = &ce->chanlist[flow];
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cet = chan->tl;
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ivsize = crypto_skcipher_ivsize(tfm);
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if (areq->src == areq->dst) {
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dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
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|
|
} 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);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (areq->iv && ivsize > 0) {
|
||
|
|
if (cet->t_iv)
|
||
|
|
dma_unmap_single(ce->dev, rctx->addr_iv, rctx->ivlen, DMA_TO_DEVICE);
|
||
|
|
offset = areq->cryptlen - ivsize;
|
||
|
|
if (rctx->op_dir & CE_DECRYPTION) {
|
||
|
|
memcpy(areq->iv, chan->backup_iv, ivsize);
|
||
|
|
memzero_explicit(chan->backup_iv, ivsize);
|
||
|
|
} else {
|
||
|
|
scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
|
||
|
|
ivsize, 0);
|
||
|
|
}
|
||
|
|
memzero_explicit(chan->bounce_iv, ivsize);
|
||
|
|
}
|
||
|
|
|
||
|
|
dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE);
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
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 sun8i_cipher_req_ctx) +
|
||
|
|
crypto_skcipher_reqsize(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;
|
||
|
|
op->enginectx.op.unprepare_request = sun8i_ce_cipher_unprepare;
|
||
|
|
|
||
|
|
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 sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct sun8i_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 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);
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|