1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * sun8i-ce-cipher.c - hardware cryptographic offloader for
4 * Allwinner H3/A64/H5/H2+/H6/R40 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/arch/arm/sunxi.rst
12 */
13
14 #include <linux/bottom_half.h>
15 #include <linux/crypto.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/io.h>
18 #include <linux/pm_runtime.h>
19 #include <crypto/scatterwalk.h>
20 #include <crypto/internal/des.h>
21 #include <crypto/internal/skcipher.h>
22 #include "sun8i-ce.h"
23
sun8i_ce_cipher_need_fallback(struct skcipher_request * areq)24 static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
25 {
26 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
27 struct scatterlist *sg;
28 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
29 struct sun8i_ce_alg_template *algt;
30 unsigned int todo, len;
31
32 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher.base);
33
34 if (sg_nents_for_len(areq->src, areq->cryptlen) > MAX_SG ||
35 sg_nents_for_len(areq->dst, areq->cryptlen) > MAX_SG) {
36 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
37 algt->stat_fb_maxsg++;
38
39 return true;
40 }
41
42 if (areq->cryptlen < crypto_skcipher_ivsize(tfm)) {
43 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
44 algt->stat_fb_leniv++;
45
46 return true;
47 }
48
49 if (areq->cryptlen == 0) {
50 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
51 algt->stat_fb_len0++;
52
53 return true;
54 }
55
56 if (areq->cryptlen % 16) {
57 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
58 algt->stat_fb_mod16++;
59
60 return true;
61 }
62
63 len = areq->cryptlen;
64 sg = areq->src;
65 while (sg) {
66 if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
67 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
68 algt->stat_fb_srcali++;
69
70 return true;
71 }
72 todo = min(len, sg->length);
73 if (todo % 4) {
74 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
75 algt->stat_fb_srclen++;
76
77 return true;
78 }
79 len -= todo;
80 sg = sg_next(sg);
81 }
82
83 len = areq->cryptlen;
84 sg = areq->dst;
85 while (sg) {
86 if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
87 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
88 algt->stat_fb_dstali++;
89
90 return true;
91 }
92 todo = min(len, sg->length);
93 if (todo % 4) {
94 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
95 algt->stat_fb_dstlen++;
96
97 return true;
98 }
99 len -= todo;
100 sg = sg_next(sg);
101 }
102 return false;
103 }
104
sun8i_ce_cipher_fallback(struct skcipher_request * areq)105 static int sun8i_ce_cipher_fallback(struct skcipher_request *areq)
106 {
107 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
108 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
109 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
110 int err;
111
112 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG)) {
113 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
114 struct sun8i_ce_alg_template *algt __maybe_unused;
115
116 algt = container_of(alg, struct sun8i_ce_alg_template,
117 alg.skcipher.base);
118
119 algt->stat_fb++;
120 }
121
122 skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
123 skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
124 areq->base.complete, areq->base.data);
125 skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
126 areq->cryptlen, areq->iv);
127 if (rctx->op_dir & CE_DECRYPTION)
128 err = crypto_skcipher_decrypt(&rctx->fallback_req);
129 else
130 err = crypto_skcipher_encrypt(&rctx->fallback_req);
131 return err;
132 }
133
sun8i_ce_cipher_prepare(struct crypto_engine * engine,void * async_req)134 static int sun8i_ce_cipher_prepare(struct crypto_engine *engine, void *async_req)
135 {
136 struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base);
137 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
138 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
139 struct sun8i_ce_dev *ce = op->ce;
140 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
141 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
142 struct sun8i_ce_alg_template *algt;
143 struct sun8i_ce_flow *chan;
144 struct ce_task *cet;
145 struct scatterlist *sg;
146 unsigned int todo, len, offset, ivsize;
147 u32 common, sym;
148 int flow, i;
149 int nr_sgs = 0;
150 int nr_sgd = 0;
151 int err = 0;
152 int ns = sg_nents_for_len(areq->src, areq->cryptlen);
153 int nd = sg_nents_for_len(areq->dst, areq->cryptlen);
154
155 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher.base);
156
157 dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
158 crypto_tfm_alg_name(areq->base.tfm),
159 areq->cryptlen,
160 rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
161 op->keylen);
162
163 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
164 algt->stat_req++;
165
166 flow = rctx->flow;
167
168 chan = &ce->chanlist[flow];
169
170 cet = chan->tl;
171 memset(cet, 0, sizeof(struct ce_task));
172
173 cet->t_id = cpu_to_le32(flow);
174 common = ce->variant->alg_cipher[algt->ce_algo_id];
175 common |= rctx->op_dir | CE_COMM_INT;
176 cet->t_common_ctl = cpu_to_le32(common);
177 /* CTS and recent CE (H6) need length in bytes, in word otherwise */
178 if (ce->variant->cipher_t_dlen_in_bytes)
179 cet->t_dlen = cpu_to_le32(areq->cryptlen);
180 else
181 cet->t_dlen = cpu_to_le32(areq->cryptlen / 4);
182
183 sym = ce->variant->op_mode[algt->ce_blockmode];
184 len = op->keylen;
185 switch (len) {
186 case 128 / 8:
187 sym |= CE_AES_128BITS;
188 break;
189 case 192 / 8:
190 sym |= CE_AES_192BITS;
191 break;
192 case 256 / 8:
193 sym |= CE_AES_256BITS;
194 break;
195 }
196
197 cet->t_sym_ctl = cpu_to_le32(sym);
198 cet->t_asym_ctl = 0;
199
200 rctx->addr_key = dma_map_single(ce->dev, op->key, op->keylen, DMA_TO_DEVICE);
201 if (dma_mapping_error(ce->dev, rctx->addr_key)) {
202 dev_err(ce->dev, "Cannot DMA MAP KEY\n");
203 err = -EFAULT;
204 goto theend;
205 }
206 cet->t_key = desc_addr_val_le32(ce, rctx->addr_key);
207
208 ivsize = crypto_skcipher_ivsize(tfm);
209 if (areq->iv && ivsize > 0) {
210 if (rctx->op_dir & CE_DECRYPTION) {
211 offset = areq->cryptlen - ivsize;
212 scatterwalk_map_and_copy(chan->backup_iv, areq->src,
213 offset, ivsize, 0);
214 }
215 memcpy(chan->bounce_iv, areq->iv, ivsize);
216 rctx->addr_iv = dma_map_single(ce->dev, chan->bounce_iv, ivsize,
217 DMA_TO_DEVICE);
218 if (dma_mapping_error(ce->dev, rctx->addr_iv)) {
219 dev_err(ce->dev, "Cannot DMA MAP IV\n");
220 err = -ENOMEM;
221 goto theend_iv;
222 }
223 cet->t_iv = desc_addr_val_le32(ce, rctx->addr_iv);
224 }
225
226 if (areq->src == areq->dst) {
227 nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_BIDIRECTIONAL);
228 if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
229 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
230 err = -EINVAL;
231 goto theend_iv;
232 }
233 nr_sgd = nr_sgs;
234 } else {
235 nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
236 if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
237 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
238 err = -EINVAL;
239 goto theend_iv;
240 }
241 nr_sgd = dma_map_sg(ce->dev, areq->dst, nd, DMA_FROM_DEVICE);
242 if (nr_sgd <= 0 || nr_sgd > MAX_SG) {
243 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
244 err = -EINVAL;
245 goto theend_sgs;
246 }
247 }
248
249 len = areq->cryptlen;
250 for_each_sg(areq->src, sg, nr_sgs, i) {
251 cet->t_src[i].addr = desc_addr_val_le32(ce, sg_dma_address(sg));
252 todo = min(len, sg_dma_len(sg));
253 cet->t_src[i].len = cpu_to_le32(todo / 4);
254 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
255 areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo);
256 len -= todo;
257 }
258 if (len > 0) {
259 dev_err(ce->dev, "remaining len %d\n", len);
260 err = -EINVAL;
261 goto theend_sgs;
262 }
263
264 len = areq->cryptlen;
265 for_each_sg(areq->dst, sg, nr_sgd, i) {
266 cet->t_dst[i].addr = desc_addr_val_le32(ce, sg_dma_address(sg));
267 todo = min(len, sg_dma_len(sg));
268 cet->t_dst[i].len = cpu_to_le32(todo / 4);
269 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
270 areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo);
271 len -= todo;
272 }
273 if (len > 0) {
274 dev_err(ce->dev, "remaining len %d\n", len);
275 err = -EINVAL;
276 goto theend_sgs;
277 }
278
279 chan->timeout = areq->cryptlen;
280 rctx->nr_sgs = ns;
281 rctx->nr_sgd = nd;
282 return 0;
283
284 theend_sgs:
285 if (areq->src == areq->dst) {
286 dma_unmap_sg(ce->dev, areq->src, ns, DMA_BIDIRECTIONAL);
287 } else {
288 if (nr_sgs > 0)
289 dma_unmap_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
290
291 if (nr_sgd > 0)
292 dma_unmap_sg(ce->dev, areq->dst, nd, DMA_FROM_DEVICE);
293 }
294
295 theend_iv:
296 if (areq->iv && ivsize > 0) {
297 if (!dma_mapping_error(ce->dev, rctx->addr_iv))
298 dma_unmap_single(ce->dev, rctx->addr_iv, ivsize,
299 DMA_TO_DEVICE);
300
301 offset = areq->cryptlen - ivsize;
302 if (rctx->op_dir & CE_DECRYPTION) {
303 memcpy(areq->iv, chan->backup_iv, ivsize);
304 memzero_explicit(chan->backup_iv, ivsize);
305 } else {
306 scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
307 ivsize, 0);
308 }
309 memzero_explicit(chan->bounce_iv, ivsize);
310 }
311
312 dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE);
313
314 theend:
315 return err;
316 }
317
sun8i_ce_cipher_unprepare(struct crypto_engine * engine,void * async_req)318 static void sun8i_ce_cipher_unprepare(struct crypto_engine *engine,
319 void *async_req)
320 {
321 struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base);
322 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
323 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
324 struct sun8i_ce_dev *ce = op->ce;
325 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
326 struct sun8i_ce_flow *chan;
327 struct ce_task *cet;
328 unsigned int ivsize, offset;
329 int nr_sgs = rctx->nr_sgs;
330 int nr_sgd = rctx->nr_sgd;
331 int flow;
332
333 flow = rctx->flow;
334 chan = &ce->chanlist[flow];
335 cet = chan->tl;
336 ivsize = crypto_skcipher_ivsize(tfm);
337
338 if (areq->src == areq->dst) {
339 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
340 } else {
341 if (nr_sgs > 0)
342 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
343 dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE);
344 }
345
346 if (areq->iv && ivsize > 0) {
347 if (cet->t_iv)
348 dma_unmap_single(ce->dev, rctx->addr_iv, ivsize,
349 DMA_TO_DEVICE);
350 offset = areq->cryptlen - ivsize;
351 if (rctx->op_dir & CE_DECRYPTION) {
352 memcpy(areq->iv, chan->backup_iv, ivsize);
353 memzero_explicit(chan->backup_iv, ivsize);
354 } else {
355 scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
356 ivsize, 0);
357 }
358 memzero_explicit(chan->bounce_iv, ivsize);
359 }
360
361 dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE);
362 }
363
sun8i_ce_cipher_run(struct crypto_engine * engine,void * areq)364 static void sun8i_ce_cipher_run(struct crypto_engine *engine, void *areq)
365 {
366 struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
367 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(breq);
368 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
369 struct sun8i_ce_dev *ce = op->ce;
370 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(breq);
371 int flow, err;
372
373 flow = rctx->flow;
374 err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(breq->base.tfm));
375 sun8i_ce_cipher_unprepare(engine, areq);
376 local_bh_disable();
377 crypto_finalize_skcipher_request(engine, breq, err);
378 local_bh_enable();
379 }
380
sun8i_ce_cipher_do_one(struct crypto_engine * engine,void * areq)381 int sun8i_ce_cipher_do_one(struct crypto_engine *engine, void *areq)
382 {
383 int err = sun8i_ce_cipher_prepare(engine, areq);
384
385 if (err)
386 return err;
387
388 sun8i_ce_cipher_run(engine, areq);
389 return 0;
390 }
391
sun8i_ce_skdecrypt(struct skcipher_request * areq)392 int sun8i_ce_skdecrypt(struct skcipher_request *areq)
393 {
394 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
395 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
396 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
397 struct crypto_engine *engine;
398 int e;
399
400 rctx->op_dir = CE_DECRYPTION;
401 if (sun8i_ce_cipher_need_fallback(areq))
402 return sun8i_ce_cipher_fallback(areq);
403
404 e = sun8i_ce_get_engine_number(op->ce);
405 rctx->flow = e;
406 engine = op->ce->chanlist[e].engine;
407
408 return crypto_transfer_skcipher_request_to_engine(engine, areq);
409 }
410
sun8i_ce_skencrypt(struct skcipher_request * areq)411 int sun8i_ce_skencrypt(struct skcipher_request *areq)
412 {
413 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
414 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
415 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
416 struct crypto_engine *engine;
417 int e;
418
419 rctx->op_dir = CE_ENCRYPTION;
420 if (sun8i_ce_cipher_need_fallback(areq))
421 return sun8i_ce_cipher_fallback(areq);
422
423 e = sun8i_ce_get_engine_number(op->ce);
424 rctx->flow = e;
425 engine = op->ce->chanlist[e].engine;
426
427 return crypto_transfer_skcipher_request_to_engine(engine, areq);
428 }
429
sun8i_ce_cipher_init(struct crypto_tfm * tfm)430 int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
431 {
432 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
433 struct sun8i_ce_alg_template *algt;
434 const char *name = crypto_tfm_alg_name(tfm);
435 struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
436 struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
437 int err;
438
439 memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));
440
441 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher.base);
442 op->ce = algt->ce;
443
444 op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
445 if (IS_ERR(op->fallback_tfm)) {
446 dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
447 name, PTR_ERR(op->fallback_tfm));
448 return PTR_ERR(op->fallback_tfm);
449 }
450
451 crypto_skcipher_set_reqsize(sktfm, sizeof(struct sun8i_cipher_req_ctx) +
452 crypto_skcipher_reqsize(op->fallback_tfm));
453
454 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG))
455 memcpy(algt->fbname,
456 crypto_skcipher_driver_name(op->fallback_tfm),
457 CRYPTO_MAX_ALG_NAME);
458
459 err = pm_runtime_resume_and_get(op->ce->dev);
460 if (err < 0)
461 goto error_pm;
462
463 return 0;
464 error_pm:
465 crypto_free_skcipher(op->fallback_tfm);
466 return err;
467 }
468
sun8i_ce_cipher_exit(struct crypto_tfm * tfm)469 void sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
470 {
471 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
472
473 kfree_sensitive(op->key);
474 crypto_free_skcipher(op->fallback_tfm);
475 pm_runtime_put_sync_suspend(op->ce->dev);
476 }
477
sun8i_ce_aes_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int keylen)478 int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
479 unsigned int keylen)
480 {
481 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
482 struct sun8i_ce_dev *ce = op->ce;
483
484 switch (keylen) {
485 case 128 / 8:
486 break;
487 case 192 / 8:
488 break;
489 case 256 / 8:
490 break;
491 default:
492 dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen);
493 return -EINVAL;
494 }
495 kfree_sensitive(op->key);
496 op->keylen = keylen;
497 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
498 if (!op->key)
499 return -ENOMEM;
500
501 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
502 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
503
504 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
505 }
506
sun8i_ce_des3_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int keylen)507 int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
508 unsigned int keylen)
509 {
510 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
511 int err;
512
513 err = verify_skcipher_des3_key(tfm, key);
514 if (err)
515 return err;
516
517 kfree_sensitive(op->key);
518 op->keylen = keylen;
519 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
520 if (!op->key)
521 return -ENOMEM;
522
523 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
524 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
525
526 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
527 }
528