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