1 // SPDX-License-Identifier: GPL-2.0
3 * sun8i-ss-cipher.c - hardware cryptographic offloader for
4 * Allwinner A80/A83T SoC
6 * Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
8 * This file add support for AES cipher with 128,192,256 bits keysize in
11 * You could find a link for the datasheet in Documentation/arm/sunxi/README
14 #include <linux/crypto.h>
15 #include <linux/dma-mapping.h>
17 #include <linux/pm_runtime.h>
18 #include <crypto/scatterwalk.h>
19 #include <crypto/internal/skcipher.h>
22 static bool sun8i_ss_need_fallback(struct skcipher_request *areq)
24 struct scatterlist *in_sg = areq->src;
25 struct scatterlist *out_sg = areq->dst;
26 struct scatterlist *sg;
28 if (areq->cryptlen == 0 || areq->cryptlen % 16)
31 if (sg_nents(areq->src) > 8 || sg_nents(areq->dst) > 8)
36 if ((sg->length % 16) != 0)
38 if ((sg_dma_len(sg) % 16) != 0)
40 if (!IS_ALIGNED(sg->offset, 16))
46 if ((sg->length % 16) != 0)
48 if ((sg_dma_len(sg) % 16) != 0)
50 if (!IS_ALIGNED(sg->offset, 16))
55 /* SS need same numbers of SG (with same length) for source and destination */
58 while (in_sg && out_sg) {
59 if (in_sg->length != out_sg->length)
61 in_sg = sg_next(in_sg);
62 out_sg = sg_next(out_sg);
69 static int sun8i_ss_cipher_fallback(struct skcipher_request *areq)
71 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
72 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
73 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
76 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, op->fallback_tfm);
77 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
78 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
79 struct sun8i_ss_alg_template *algt;
81 algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
84 skcipher_request_set_sync_tfm(subreq, op->fallback_tfm);
85 skcipher_request_set_callback(subreq, areq->base.flags, NULL, NULL);
86 skcipher_request_set_crypt(subreq, areq->src, areq->dst,
87 areq->cryptlen, areq->iv);
88 if (rctx->op_dir & SS_DECRYPTION)
89 err = crypto_skcipher_decrypt(subreq);
91 err = crypto_skcipher_encrypt(subreq);
92 skcipher_request_zero(subreq);
96 static int sun8i_ss_cipher(struct skcipher_request *areq)
98 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
99 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
100 struct sun8i_ss_dev *ss = op->ss;
101 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
102 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
103 struct sun8i_ss_alg_template *algt;
104 struct scatterlist *sg;
105 unsigned int todo, len, offset, ivsize;
106 void *backup_iv = NULL;
112 algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
114 dev_dbg(ss->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
115 crypto_tfm_alg_name(areq->base.tfm),
117 rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
120 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
124 rctx->op_mode = ss->variant->op_mode[algt->ss_blockmode];
125 rctx->method = ss->variant->alg_cipher[algt->ss_algo_id];
126 rctx->keylen = op->keylen;
128 rctx->p_key = dma_map_single(ss->dev, op->key, op->keylen, DMA_TO_DEVICE);
129 if (dma_mapping_error(ss->dev, rctx->p_key)) {
130 dev_err(ss->dev, "Cannot DMA MAP KEY\n");
135 ivsize = crypto_skcipher_ivsize(tfm);
136 if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
137 rctx->ivlen = ivsize;
138 rctx->biv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA);
143 if (rctx->op_dir & SS_DECRYPTION) {
144 backup_iv = kzalloc(ivsize, GFP_KERNEL);
149 offset = areq->cryptlen - ivsize;
150 scatterwalk_map_and_copy(backup_iv, areq->src, offset,
153 memcpy(rctx->biv, areq->iv, ivsize);
154 rctx->p_iv = dma_map_single(ss->dev, rctx->biv, rctx->ivlen,
156 if (dma_mapping_error(ss->dev, rctx->p_iv)) {
157 dev_err(ss->dev, "Cannot DMA MAP IV\n");
162 if (areq->src == areq->dst) {
163 nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src),
165 if (nr_sgs <= 0 || nr_sgs > 8) {
166 dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
172 nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src),
174 if (nr_sgs <= 0 || nr_sgs > 8) {
175 dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
179 nr_sgd = dma_map_sg(ss->dev, areq->dst, sg_nents(areq->dst),
181 if (nr_sgd <= 0 || nr_sgd > 8) {
182 dev_err(ss->dev, "Invalid sg number %d\n", nr_sgd);
188 len = areq->cryptlen;
191 while (i < nr_sgs && sg && len) {
192 if (sg_dma_len(sg) == 0)
194 rctx->t_src[i].addr = sg_dma_address(sg);
195 todo = min(len, sg_dma_len(sg));
196 rctx->t_src[i].len = todo / 4;
197 dev_dbg(ss->dev, "%s total=%u SGS(%d %u off=%d) todo=%u\n", __func__,
198 areq->cryptlen, i, rctx->t_src[i].len, sg->offset, todo);
205 dev_err(ss->dev, "remaining len %d\n", len);
210 len = areq->cryptlen;
213 while (i < nr_sgd && sg && len) {
214 if (sg_dma_len(sg) == 0)
216 rctx->t_dst[i].addr = sg_dma_address(sg);
217 todo = min(len, sg_dma_len(sg));
218 rctx->t_dst[i].len = todo / 4;
219 dev_dbg(ss->dev, "%s total=%u SGD(%d %u off=%d) todo=%u\n", __func__,
220 areq->cryptlen, i, rctx->t_dst[i].len, sg->offset, todo);
227 dev_err(ss->dev, "remaining len %d\n", len);
232 err = sun8i_ss_run_task(ss, rctx, crypto_tfm_alg_name(areq->base.tfm));
235 if (areq->src == areq->dst) {
236 dma_unmap_sg(ss->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
238 dma_unmap_sg(ss->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
239 dma_unmap_sg(ss->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE);
244 dma_unmap_single(ss->dev, rctx->p_iv, rctx->ivlen,
247 if (areq->iv && ivsize > 0) {
249 offset = areq->cryptlen - ivsize;
250 if (rctx->op_dir & SS_DECRYPTION) {
251 memcpy(areq->iv, backup_iv, ivsize);
252 memzero_explicit(backup_iv, ivsize);
255 scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
263 dma_unmap_single(ss->dev, rctx->p_key, op->keylen, DMA_TO_DEVICE);
270 static int sun8i_ss_handle_cipher_request(struct crypto_engine *engine, void *areq)
273 struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
275 err = sun8i_ss_cipher(breq);
276 crypto_finalize_skcipher_request(engine, breq, err);
281 int sun8i_ss_skdecrypt(struct skcipher_request *areq)
283 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
284 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
285 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
286 struct crypto_engine *engine;
289 memset(rctx, 0, sizeof(struct sun8i_cipher_req_ctx));
290 rctx->op_dir = SS_DECRYPTION;
292 if (sun8i_ss_need_fallback(areq))
293 return sun8i_ss_cipher_fallback(areq);
295 e = sun8i_ss_get_engine_number(op->ss);
296 engine = op->ss->flows[e].engine;
299 return crypto_transfer_skcipher_request_to_engine(engine, areq);
302 int sun8i_ss_skencrypt(struct skcipher_request *areq)
304 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
305 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
306 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
307 struct crypto_engine *engine;
310 memset(rctx, 0, sizeof(struct sun8i_cipher_req_ctx));
311 rctx->op_dir = SS_ENCRYPTION;
313 if (sun8i_ss_need_fallback(areq))
314 return sun8i_ss_cipher_fallback(areq);
316 e = sun8i_ss_get_engine_number(op->ss);
317 engine = op->ss->flows[e].engine;
320 return crypto_transfer_skcipher_request_to_engine(engine, areq);
323 int sun8i_ss_cipher_init(struct crypto_tfm *tfm)
325 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
326 struct sun8i_ss_alg_template *algt;
327 const char *name = crypto_tfm_alg_name(tfm);
328 struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
329 struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
332 memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));
334 algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
337 sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx);
339 op->fallback_tfm = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
340 if (IS_ERR(op->fallback_tfm)) {
341 dev_err(op->ss->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
342 name, PTR_ERR(op->fallback_tfm));
343 return PTR_ERR(op->fallback_tfm);
346 dev_info(op->ss->dev, "Fallback for %s is %s\n",
347 crypto_tfm_alg_driver_name(&sktfm->base),
348 crypto_tfm_alg_driver_name(crypto_skcipher_tfm(&op->fallback_tfm->base)));
350 op->enginectx.op.do_one_request = sun8i_ss_handle_cipher_request;
351 op->enginectx.op.prepare_request = NULL;
352 op->enginectx.op.unprepare_request = NULL;
354 err = pm_runtime_get_sync(op->ss->dev);
356 dev_err(op->ss->dev, "pm error %d\n", err);
362 crypto_free_sync_skcipher(op->fallback_tfm);
366 void sun8i_ss_cipher_exit(struct crypto_tfm *tfm)
368 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
371 memzero_explicit(op->key, op->keylen);
374 crypto_free_sync_skcipher(op->fallback_tfm);
375 pm_runtime_put_sync(op->ss->dev);
378 int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
381 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
382 struct sun8i_ss_dev *ss = op->ss;
392 dev_dbg(ss->dev, "ERROR: Invalid keylen %u\n", keylen);
396 memzero_explicit(op->key, op->keylen);
400 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
404 crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
405 crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
407 return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);
410 int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
413 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
414 struct sun8i_ss_dev *ss = op->ss;
416 if (unlikely(keylen != 3 * DES_KEY_SIZE)) {
417 dev_dbg(ss->dev, "Invalid keylen %u\n", keylen);
422 memzero_explicit(op->key, op->keylen);
426 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
430 crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
431 crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
433 return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen);