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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
24static 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);
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
89static 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#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
96 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
97 struct sun8i_ce_alg_template *algt;
98
99 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
100 algt->stat_fb++;
101#endif
102
103 skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
104 skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
105 areq->base.complete, areq->base.data);
106 skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
107 areq->cryptlen, areq->iv);
108 if (rctx->op_dir & CE_DECRYPTION)
109 err = crypto_skcipher_decrypt(&rctx->fallback_req);
110 else
111 err = crypto_skcipher_encrypt(&rctx->fallback_req);
112 return err;
113}
114
115static int sun8i_ce_cipher_prepare(struct crypto_engine *engine, void *async_req)
116{
117 struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base);
118 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
119 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
120 struct sun8i_ce_dev *ce = op->ce;
121 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
122 struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
123 struct sun8i_ce_alg_template *algt;
124 struct sun8i_ce_flow *chan;
125 struct ce_task *cet;
126 struct scatterlist *sg;
127 unsigned int todo, len, offset, ivsize;
128 u32 common, sym;
129 int flow, i;
130 int nr_sgs = 0;
131 int nr_sgd = 0;
132 int err = 0;
133 int ns = sg_nents_for_len(areq->src, areq->cryptlen);
134 int nd = sg_nents_for_len(areq->dst, areq->cryptlen);
135
136 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
137
138 dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
139 crypto_tfm_alg_name(areq->base.tfm),
140 areq->cryptlen,
141 rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
142 op->keylen);
143
144#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
145 algt->stat_req++;
146#endif
147
148 flow = rctx->flow;
149
150 chan = &ce->chanlist[flow];
151
152 cet = chan->tl;
153 memset(cet, 0, sizeof(struct ce_task));
154
155 cet->t_id = cpu_to_le32(flow);
156 common = ce->variant->alg_cipher[algt->ce_algo_id];
157 common |= rctx->op_dir | CE_COMM_INT;
158 cet->t_common_ctl = cpu_to_le32(common);
159
160 if (ce->variant->cipher_t_dlen_in_bytes)
161 cet->t_dlen = cpu_to_le32(areq->cryptlen);
162 else
163 cet->t_dlen = cpu_to_le32(areq->cryptlen / 4);
164
165 sym = ce->variant->op_mode[algt->ce_blockmode];
166 len = op->keylen;
167 switch (len) {
168 case 128 / 8:
169 sym |= CE_AES_128BITS;
170 break;
171 case 192 / 8:
172 sym |= CE_AES_192BITS;
173 break;
174 case 256 / 8:
175 sym |= CE_AES_256BITS;
176 break;
177 }
178
179 cet->t_sym_ctl = cpu_to_le32(sym);
180 cet->t_asym_ctl = 0;
181
182 rctx->addr_key = dma_map_single(ce->dev, op->key, op->keylen, DMA_TO_DEVICE);
183 if (dma_mapping_error(ce->dev, rctx->addr_key)) {
184 dev_err(ce->dev, "Cannot DMA MAP KEY\n");
185 err = -EFAULT;
186 goto theend;
187 }
188 cet->t_key = cpu_to_le32(rctx->addr_key);
189
190 ivsize = crypto_skcipher_ivsize(tfm);
191 if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
192 rctx->ivlen = ivsize;
193 if (rctx->op_dir & CE_DECRYPTION) {
194 offset = areq->cryptlen - ivsize;
195 scatterwalk_map_and_copy(chan->backup_iv, areq->src,
196 offset, ivsize, 0);
197 }
198 memcpy(chan->bounce_iv, areq->iv, ivsize);
199 rctx->addr_iv = dma_map_single(ce->dev, chan->bounce_iv, rctx->ivlen,
200 DMA_TO_DEVICE);
201 if (dma_mapping_error(ce->dev, rctx->addr_iv)) {
202 dev_err(ce->dev, "Cannot DMA MAP IV\n");
203 err = -ENOMEM;
204 goto theend_iv;
205 }
206 cet->t_iv = cpu_to_le32(rctx->addr_iv);
207 }
208
209 if (areq->src == areq->dst) {
210 nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_BIDIRECTIONAL);
211 if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
212 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
213 err = -EINVAL;
214 goto theend_iv;
215 }
216 nr_sgd = nr_sgs;
217 } else {
218 nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
219 if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
220 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
221 err = -EINVAL;
222 goto theend_iv;
223 }
224 nr_sgd = dma_map_sg(ce->dev, areq->dst, nd, DMA_FROM_DEVICE);
225 if (nr_sgd <= 0 || nr_sgd > MAX_SG) {
226 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
227 err = -EINVAL;
228 goto theend_sgs;
229 }
230 }
231
232 len = areq->cryptlen;
233 for_each_sg(areq->src, sg, nr_sgs, i) {
234 cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg));
235 todo = min(len, sg_dma_len(sg));
236 cet->t_src[i].len = cpu_to_le32(todo / 4);
237 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
238 areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo);
239 len -= todo;
240 }
241 if (len > 0) {
242 dev_err(ce->dev, "remaining len %d\n", len);
243 err = -EINVAL;
244 goto theend_sgs;
245 }
246
247 len = areq->cryptlen;
248 for_each_sg(areq->dst, sg, nr_sgd, i) {
249 cet->t_dst[i].addr = cpu_to_le32(sg_dma_address(sg));
250 todo = min(len, sg_dma_len(sg));
251 cet->t_dst[i].len = cpu_to_le32(todo / 4);
252 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__,
253 areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo);
254 len -= todo;
255 }
256 if (len > 0) {
257 dev_err(ce->dev, "remaining len %d\n", len);
258 err = -EINVAL;
259 goto theend_sgs;
260 }
261
262 chan->timeout = areq->cryptlen;
263 rctx->nr_sgs = nr_sgs;
264 rctx->nr_sgd = nr_sgd;
265 return 0;
266
267theend_sgs:
268 if (areq->src == areq->dst) {
269 dma_unmap_sg(ce->dev, areq->src, ns, DMA_BIDIRECTIONAL);
270 } else {
271 if (nr_sgs > 0)
272 dma_unmap_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
273 dma_unmap_sg(ce->dev, areq->dst, nd, DMA_FROM_DEVICE);
274 }
275
276theend_iv:
277 if (areq->iv && ivsize > 0) {
278 if (rctx->addr_iv)
279 dma_unmap_single(ce->dev, rctx->addr_iv, rctx->ivlen, DMA_TO_DEVICE);
280 offset = areq->cryptlen - ivsize;
281 if (rctx->op_dir & CE_DECRYPTION) {
282 memcpy(areq->iv, chan->backup_iv, ivsize);
283 memzero_explicit(chan->backup_iv, ivsize);
284 } else {
285 scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
286 ivsize, 0);
287 }
288 memzero_explicit(chan->bounce_iv, ivsize);
289 }
290
291 dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE);
292
293theend:
294 return err;
295}
296
297static int sun8i_ce_cipher_run(struct crypto_engine *engine, void *areq)
298{
299 struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
300 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(breq);
301 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
302 struct sun8i_ce_dev *ce = op->ce;
303 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(breq);
304 int flow, err;
305
306 flow = rctx->flow;
307 err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(breq->base.tfm));
308 local_bh_disable();
309 crypto_finalize_skcipher_request(engine, breq, err);
310 local_bh_enable();
311 return 0;
312}
313
314static int sun8i_ce_cipher_unprepare(struct crypto_engine *engine, void *async_req)
315{
316 struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base);
317 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
318 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
319 struct sun8i_ce_dev *ce = op->ce;
320 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
321 struct sun8i_ce_flow *chan;
322 struct ce_task *cet;
323 unsigned int ivsize, offset;
324 int nr_sgs = rctx->nr_sgs;
325 int nr_sgd = rctx->nr_sgd;
326 int flow;
327
328 flow = rctx->flow;
329 chan = &ce->chanlist[flow];
330 cet = chan->tl;
331 ivsize = crypto_skcipher_ivsize(tfm);
332
333 if (areq->src == areq->dst) {
334 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL);
335 } else {
336 if (nr_sgs > 0)
337 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
338 dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE);
339 }
340
341 if (areq->iv && ivsize > 0) {
342 if (cet->t_iv)
343 dma_unmap_single(ce->dev, rctx->addr_iv, rctx->ivlen, DMA_TO_DEVICE);
344 offset = areq->cryptlen - ivsize;
345 if (rctx->op_dir & CE_DECRYPTION) {
346 memcpy(areq->iv, chan->backup_iv, ivsize);
347 memzero_explicit(chan->backup_iv, ivsize);
348 } else {
349 scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
350 ivsize, 0);
351 }
352 memzero_explicit(chan->bounce_iv, ivsize);
353 }
354
355 dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE);
356
357 return 0;
358}
359
360int sun8i_ce_skdecrypt(struct skcipher_request *areq)
361{
362 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
363 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
364 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
365 struct crypto_engine *engine;
366 int e;
367
368 rctx->op_dir = CE_DECRYPTION;
369 if (sun8i_ce_cipher_need_fallback(areq))
370 return sun8i_ce_cipher_fallback(areq);
371
372 e = sun8i_ce_get_engine_number(op->ce);
373 rctx->flow = e;
374 engine = op->ce->chanlist[e].engine;
375
376 return crypto_transfer_skcipher_request_to_engine(engine, areq);
377}
378
379int sun8i_ce_skencrypt(struct skcipher_request *areq)
380{
381 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
382 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
383 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
384 struct crypto_engine *engine;
385 int e;
386
387 rctx->op_dir = CE_ENCRYPTION;
388 if (sun8i_ce_cipher_need_fallback(areq))
389 return sun8i_ce_cipher_fallback(areq);
390
391 e = sun8i_ce_get_engine_number(op->ce);
392 rctx->flow = e;
393 engine = op->ce->chanlist[e].engine;
394
395 return crypto_transfer_skcipher_request_to_engine(engine, areq);
396}
397
398int sun8i_ce_cipher_init(struct crypto_tfm *tfm)
399{
400 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
401 struct sun8i_ce_alg_template *algt;
402 const char *name = crypto_tfm_alg_name(tfm);
403 struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
404 struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
405 int err;
406
407 memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));
408
409 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
410 op->ce = algt->ce;
411
412 op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
413 if (IS_ERR(op->fallback_tfm)) {
414 dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
415 name, PTR_ERR(op->fallback_tfm));
416 return PTR_ERR(op->fallback_tfm);
417 }
418
419 sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) +
420 crypto_skcipher_reqsize(op->fallback_tfm);
421
422 memcpy(algt->fbname,
423 crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)),
424 CRYPTO_MAX_ALG_NAME);
425
426 op->enginectx.op.do_one_request = sun8i_ce_cipher_run;
427 op->enginectx.op.prepare_request = sun8i_ce_cipher_prepare;
428 op->enginectx.op.unprepare_request = sun8i_ce_cipher_unprepare;
429
430 err = pm_runtime_get_sync(op->ce->dev);
431 if (err < 0)
432 goto error_pm;
433
434 return 0;
435error_pm:
436 pm_runtime_put_noidle(op->ce->dev);
437 crypto_free_skcipher(op->fallback_tfm);
438 return err;
439}
440
441void sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
442{
443 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
444
445 kfree_sensitive(op->key);
446 crypto_free_skcipher(op->fallback_tfm);
447 pm_runtime_put_sync_suspend(op->ce->dev);
448}
449
450int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
451 unsigned int keylen)
452{
453 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
454 struct sun8i_ce_dev *ce = op->ce;
455
456 switch (keylen) {
457 case 128 / 8:
458 break;
459 case 192 / 8:
460 break;
461 case 256 / 8:
462 break;
463 default:
464 dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen);
465 return -EINVAL;
466 }
467 kfree_sensitive(op->key);
468 op->keylen = keylen;
469 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
470 if (!op->key)
471 return -ENOMEM;
472
473 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
474 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
475
476 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
477}
478
479int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
480 unsigned int keylen)
481{
482 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
483 int err;
484
485 err = verify_skcipher_des3_key(tfm, key);
486 if (err)
487 return err;
488
489 kfree_sensitive(op->key);
490 op->keylen = keylen;
491 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
492 if (!op->key)
493 return -ENOMEM;
494
495 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
496 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
497
498 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
499}
500
