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