1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * sun8i-ss-cipher.c - hardware cryptographic offloader for
4 * Allwinner A80/A83T SoC
5 *
6 * Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
7 *
8 * This file add support for AES cipher with 128,192,256 bits keysize in
9 * CBC and ECB mode.
10 *
11 * You could find a link for the datasheet in Documentation/arm/sunxi.rst
12 */
13
14 #include <linux/crypto.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/io.h>
17 #include <linux/pm_runtime.h>
18 #include <crypto/scatterwalk.h>
19 #include <crypto/internal/skcipher.h>
20 #include "sun8i-ss.h"
21
sun8i_ss_need_fallback(struct skcipher_request * areq)22 static bool sun8i_ss_need_fallback(struct skcipher_request *areq)
23 {
24 struct scatterlist *in_sg = areq->src;
25 struct scatterlist *out_sg = areq->dst;
26 struct scatterlist *sg;
27
28 if (areq->cryptlen == 0 || areq->cryptlen % 16)
29 return true;
30
31 if (sg_nents(areq->src) > 8 || sg_nents(areq->dst) > 8)
32 return true;
33
34 sg = areq->src;
35 while (sg) {
36 if ((sg->length % 16) != 0)
37 return true;
38 if ((sg_dma_len(sg) % 16) != 0)
39 return true;
40 if (!IS_ALIGNED(sg->offset, 16))
41 return true;
42 sg = sg_next(sg);
43 }
44 sg = areq->dst;
45 while (sg) {
46 if ((sg->length % 16) != 0)
47 return true;
48 if ((sg_dma_len(sg) % 16) != 0)
49 return true;
50 if (!IS_ALIGNED(sg->offset, 16))
51 return true;
52 sg = sg_next(sg);
53 }
54
55 /* SS need same numbers of SG (with same length) for source and destination */
56 in_sg = areq->src;
57 out_sg = areq->dst;
58 while (in_sg && out_sg) {
59 if (in_sg->length != out_sg->length)
60 return true;
61 in_sg = sg_next(in_sg);
62 out_sg = sg_next(out_sg);
63 }
64 if (in_sg || out_sg)
65 return true;
66 return false;
67 }
68
sun8i_ss_cipher_fallback(struct skcipher_request * areq)69 static int sun8i_ss_cipher_fallback(struct skcipher_request *areq)
70 {
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);
74 int err;
75
76 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
77 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
78 struct sun8i_ss_alg_template *algt;
79
80 algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
81 algt->stat_fb++;
82 #endif
83 skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
84 skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
85 areq->base.complete, areq->base.data);
86 skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
87 areq->cryptlen, areq->iv);
88 if (rctx->op_dir & SS_DECRYPTION)
89 err = crypto_skcipher_decrypt(&rctx->fallback_req);
90 else
91 err = crypto_skcipher_encrypt(&rctx->fallback_req);
92 return err;
93 }
94
sun8i_ss_cipher(struct skcipher_request * areq)95 static int sun8i_ss_cipher(struct skcipher_request *areq)
96 {
97 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
98 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
99 struct sun8i_ss_dev *ss = op->ss;
100 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
101 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
102 struct sun8i_ss_alg_template *algt;
103 struct scatterlist *sg;
104 unsigned int todo, len, offset, ivsize;
105 void *backup_iv = NULL;
106 int nr_sgs = 0;
107 int nr_sgd = 0;
108 int err = 0;
109 int i;
110
111 algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
112
113 dev_dbg(ss->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
114 crypto_tfm_alg_name(areq->base.tfm),
115 areq->cryptlen,
116 rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
117 op->keylen);
118
119 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
120 algt->stat_req++;
121 #endif
122
123 rctx->op_mode = ss->variant->op_mode[algt->ss_blockmode];
124 rctx->method = ss->variant->alg_cipher[algt->ss_algo_id];
125 rctx->keylen = op->keylen;
126
127 rctx->p_key = dma_map_single(ss->dev, op->key, op->keylen, DMA_TO_DEVICE);
128 if (dma_mapping_error(ss->dev, rctx->p_key)) {
129 dev_err(ss->dev, "Cannot DMA MAP KEY\n");
130 err = -EFAULT;
131 goto theend;
132 }
133
134 ivsize = crypto_skcipher_ivsize(tfm);
135 if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
136 rctx->ivlen = ivsize;
137 rctx->biv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA);
138 if (!rctx->biv) {
139 err = -ENOMEM;
140 goto theend_key;
141 }
142 if (rctx->op_dir & SS_DECRYPTION) {
143 backup_iv = kzalloc(ivsize, GFP_KERNEL);
144 if (!backup_iv) {
145 err = -ENOMEM;
146 goto theend_key;
147 }
148 offset = areq->cryptlen - ivsize;
149 scatterwalk_map_and_copy(backup_iv, areq->src, offset,
150 ivsize, 0);
151 }
152 memcpy(rctx->biv, areq->iv, ivsize);
153 rctx->p_iv = dma_map_single(ss->dev, rctx->biv, rctx->ivlen,
154 DMA_TO_DEVICE);
155 if (dma_mapping_error(ss->dev, rctx->p_iv)) {
156 dev_err(ss->dev, "Cannot DMA MAP IV\n");
157 err = -ENOMEM;
158 goto theend_iv;
159 }
160 }
161 if (areq->src == areq->dst) {
162 nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src),
163 DMA_BIDIRECTIONAL);
164 if (nr_sgs <= 0 || nr_sgs > 8) {
165 dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
166 err = -EINVAL;
167 goto theend_iv;
168 }
169 nr_sgd = nr_sgs;
170 } else {
171 nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src),
172 DMA_TO_DEVICE);
173 if (nr_sgs <= 0 || nr_sgs > 8) {
174 dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
175 err = -EINVAL;
176 goto theend_iv;
177 }
178 nr_sgd = dma_map_sg(ss->dev, areq->dst, sg_nents(areq->dst),
179 DMA_FROM_DEVICE);
180 if (nr_sgd <= 0 || nr_sgd > 8) {
181 dev_err(ss->dev, "Invalid sg number %d\n", nr_sgd);
182 err = -EINVAL;
183 goto theend_sgs;
184 }
185 }
186
187 len = areq->cryptlen;
188 i = 0;
189 sg = areq->src;
190 while (i < nr_sgs && sg && len) {
191 if (sg_dma_len(sg) == 0)
192 goto sgs_next;
193 rctx->t_src[i].addr = sg_dma_address(sg);
194 todo = min(len, sg_dma_len(sg));
195 rctx->t_src[i].len = todo / 4;
196 dev_dbg(ss->dev, "%s total=%u SGS(%d %u off=%d) todo=%u\n", __func__,
197 areq->cryptlen, i, rctx->t_src[i].len, sg->offset, todo);
198 len -= todo;
199 i++;
200 sgs_next:
201 sg = sg_next(sg);
202 }
203 if (len > 0) {
204 dev_err(ss->dev, "remaining len %d\n", len);
205 err = -EINVAL;
206 goto theend_sgs;
207 }
208
209 len = areq->cryptlen;
210 i = 0;
211 sg = areq->dst;
212 while (i < nr_sgd && sg && len) {
213 if (sg_dma_len(sg) == 0)
214 goto sgd_next;
215 rctx->t_dst[i].addr = sg_dma_address(sg);
216 todo = min(len, sg_dma_len(sg));
217 rctx->t_dst[i].len = todo / 4;
218 dev_dbg(ss->dev, "%s total=%u SGD(%d %u off=%d) todo=%u\n", __func__,
219 areq->cryptlen, i, rctx->t_dst[i].len, sg->offset, todo);
220 len -= todo;
221 i++;
222 sgd_next:
223 sg = sg_next(sg);
224 }
225 if (len > 0) {
226 dev_err(ss->dev, "remaining len %d\n", len);
227 err = -EINVAL;
228 goto theend_sgs;
229 }
230
231 err = sun8i_ss_run_task(ss, rctx, crypto_tfm_alg_name(areq->base.tfm));
232
233 theend_sgs:
234 if (areq->src == areq->dst) {
235 dma_unmap_sg(ss->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
236 } else {
237 dma_unmap_sg(ss->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
238 dma_unmap_sg(ss->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE);
239 }
240
241 theend_iv:
242 if (rctx->p_iv)
243 dma_unmap_single(ss->dev, rctx->p_iv, rctx->ivlen,
244 DMA_TO_DEVICE);
245
246 if (areq->iv && ivsize > 0) {
247 if (rctx->biv) {
248 offset = areq->cryptlen - ivsize;
249 if (rctx->op_dir & SS_DECRYPTION) {
250 memcpy(areq->iv, backup_iv, ivsize);
251 kfree_sensitive(backup_iv);
252 } else {
253 scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
254 ivsize, 0);
255 }
256 kfree(rctx->biv);
257 }
258 }
259
260 theend_key:
261 dma_unmap_single(ss->dev, rctx->p_key, op->keylen, DMA_TO_DEVICE);
262
263 theend:
264
265 return err;
266 }
267
sun8i_ss_handle_cipher_request(struct crypto_engine * engine,void * areq)268 static int sun8i_ss_handle_cipher_request(struct crypto_engine *engine, void *areq)
269 {
270 int err;
271 struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
272
273 err = sun8i_ss_cipher(breq);
274 crypto_finalize_skcipher_request(engine, breq, err);
275
276 return 0;
277 }
278
sun8i_ss_skdecrypt(struct skcipher_request * areq)279 int sun8i_ss_skdecrypt(struct skcipher_request *areq)
280 {
281 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
282 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
283 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
284 struct crypto_engine *engine;
285 int e;
286
287 memset(rctx, 0, sizeof(struct sun8i_cipher_req_ctx));
288 rctx->op_dir = SS_DECRYPTION;
289
290 if (sun8i_ss_need_fallback(areq))
291 return sun8i_ss_cipher_fallback(areq);
292
293 e = sun8i_ss_get_engine_number(op->ss);
294 engine = op->ss->flows[e].engine;
295 rctx->flow = e;
296
297 return crypto_transfer_skcipher_request_to_engine(engine, areq);
298 }
299
sun8i_ss_skencrypt(struct skcipher_request * areq)300 int sun8i_ss_skencrypt(struct skcipher_request *areq)
301 {
302 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
303 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
304 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
305 struct crypto_engine *engine;
306 int e;
307
308 memset(rctx, 0, sizeof(struct sun8i_cipher_req_ctx));
309 rctx->op_dir = SS_ENCRYPTION;
310
311 if (sun8i_ss_need_fallback(areq))
312 return sun8i_ss_cipher_fallback(areq);
313
314 e = sun8i_ss_get_engine_number(op->ss);
315 engine = op->ss->flows[e].engine;
316 rctx->flow = e;
317
318 return crypto_transfer_skcipher_request_to_engine(engine, areq);
319 }
320
sun8i_ss_cipher_init(struct crypto_tfm * tfm)321 int sun8i_ss_cipher_init(struct crypto_tfm *tfm)
322 {
323 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
324 struct sun8i_ss_alg_template *algt;
325 const char *name = crypto_tfm_alg_name(tfm);
326 struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
327 struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
328 int err;
329
330 memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));
331
332 algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
333 op->ss = algt->ss;
334
335 op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
336 if (IS_ERR(op->fallback_tfm)) {
337 dev_err(op->ss->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
338 name, PTR_ERR(op->fallback_tfm));
339 return PTR_ERR(op->fallback_tfm);
340 }
341
342 sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) +
343 crypto_skcipher_reqsize(op->fallback_tfm);
344
345
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)));
349
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;
353
354 err = pm_runtime_get_sync(op->ss->dev);
355 if (err < 0) {
356 dev_err(op->ss->dev, "pm error %d\n", err);
357 goto error_pm;
358 }
359
360 return 0;
361 error_pm:
362 crypto_free_skcipher(op->fallback_tfm);
363 return err;
364 }
365
sun8i_ss_cipher_exit(struct crypto_tfm * tfm)366 void sun8i_ss_cipher_exit(struct crypto_tfm *tfm)
367 {
368 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
369
370 kfree_sensitive(op->key);
371 crypto_free_skcipher(op->fallback_tfm);
372 pm_runtime_put_sync(op->ss->dev);
373 }
374
sun8i_ss_aes_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int keylen)375 int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
376 unsigned int keylen)
377 {
378 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
379 struct sun8i_ss_dev *ss = op->ss;
380
381 switch (keylen) {
382 case 128 / 8:
383 break;
384 case 192 / 8:
385 break;
386 case 256 / 8:
387 break;
388 default:
389 dev_dbg(ss->dev, "ERROR: Invalid keylen %u\n", keylen);
390 return -EINVAL;
391 }
392 kfree_sensitive(op->key);
393 op->keylen = keylen;
394 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
395 if (!op->key)
396 return -ENOMEM;
397
398 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
399 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
400
401 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
402 }
403
sun8i_ss_des3_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int keylen)404 int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
405 unsigned int keylen)
406 {
407 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
408 struct sun8i_ss_dev *ss = op->ss;
409
410 if (unlikely(keylen != 3 * DES_KEY_SIZE)) {
411 dev_dbg(ss->dev, "Invalid keylen %u\n", keylen);
412 return -EINVAL;
413 }
414
415 kfree_sensitive(op->key);
416 op->keylen = keylen;
417 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
418 if (!op->key)
419 return -ENOMEM;
420
421 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
422 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
423
424 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
425 }
426
