1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * sun8i-ss-hash.c - hardware cryptographic offloader for
4 * Allwinner A80/A83T SoC
5 *
6 * Copyright (C) 2015-2020 Corentin Labbe <clabbe@baylibre.com>
7 *
8 * This file add support for MD5 and SHA1/SHA224/SHA256.
9 *
10 * You could find the datasheet in Documentation/arm/sunxi.rst
11 */
12 #include <linux/dma-mapping.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/scatterlist.h>
15 #include <crypto/internal/hash.h>
16 #include <crypto/sha.h>
17 #include <crypto/md5.h>
18 #include "sun8i-ss.h"
19
sun8i_ss_hash_crainit(struct crypto_tfm * tfm)20 int sun8i_ss_hash_crainit(struct crypto_tfm *tfm)
21 {
22 struct sun8i_ss_hash_tfm_ctx *op = crypto_tfm_ctx(tfm);
23 struct ahash_alg *alg = __crypto_ahash_alg(tfm->__crt_alg);
24 struct sun8i_ss_alg_template *algt;
25 int err;
26
27 memset(op, 0, sizeof(struct sun8i_ss_hash_tfm_ctx));
28
29 algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash);
30 op->ss = algt->ss;
31
32 op->enginectx.op.do_one_request = sun8i_ss_hash_run;
33 op->enginectx.op.prepare_request = NULL;
34 op->enginectx.op.unprepare_request = NULL;
35
36 /* FALLBACK */
37 op->fallback_tfm = crypto_alloc_ahash(crypto_tfm_alg_name(tfm), 0,
38 CRYPTO_ALG_NEED_FALLBACK);
39 if (IS_ERR(op->fallback_tfm)) {
40 dev_err(algt->ss->dev, "Fallback driver could no be loaded\n");
41 return PTR_ERR(op->fallback_tfm);
42 }
43
44 if (algt->alg.hash.halg.statesize < crypto_ahash_statesize(op->fallback_tfm))
45 algt->alg.hash.halg.statesize = crypto_ahash_statesize(op->fallback_tfm);
46
47 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
48 sizeof(struct sun8i_ss_hash_reqctx) +
49 crypto_ahash_reqsize(op->fallback_tfm));
50
51 dev_info(op->ss->dev, "Fallback for %s is %s\n",
52 crypto_tfm_alg_driver_name(tfm),
53 crypto_tfm_alg_driver_name(&op->fallback_tfm->base));
54 err = pm_runtime_get_sync(op->ss->dev);
55 if (err < 0)
56 goto error_pm;
57 return 0;
58 error_pm:
59 pm_runtime_put_noidle(op->ss->dev);
60 crypto_free_ahash(op->fallback_tfm);
61 return err;
62 }
63
sun8i_ss_hash_craexit(struct crypto_tfm * tfm)64 void sun8i_ss_hash_craexit(struct crypto_tfm *tfm)
65 {
66 struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_tfm_ctx(tfm);
67
68 crypto_free_ahash(tfmctx->fallback_tfm);
69 pm_runtime_put_sync_suspend(tfmctx->ss->dev);
70 }
71
sun8i_ss_hash_init(struct ahash_request * areq)72 int sun8i_ss_hash_init(struct ahash_request *areq)
73 {
74 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
75 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
76 struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
77
78 memset(rctx, 0, sizeof(struct sun8i_ss_hash_reqctx));
79
80 ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
81 rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
82
83 return crypto_ahash_init(&rctx->fallback_req);
84 }
85
sun8i_ss_hash_export(struct ahash_request * areq,void * out)86 int sun8i_ss_hash_export(struct ahash_request *areq, void *out)
87 {
88 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
89 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
90 struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
91
92 ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
93 rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
94
95 return crypto_ahash_export(&rctx->fallback_req, out);
96 }
97
sun8i_ss_hash_import(struct ahash_request * areq,const void * in)98 int sun8i_ss_hash_import(struct ahash_request *areq, const void *in)
99 {
100 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
101 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
102 struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
103
104 ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
105 rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
106
107 return crypto_ahash_import(&rctx->fallback_req, in);
108 }
109
sun8i_ss_hash_final(struct ahash_request * areq)110 int sun8i_ss_hash_final(struct ahash_request *areq)
111 {
112 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
113 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
114 struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
115 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
116 struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
117 struct sun8i_ss_alg_template *algt;
118 #endif
119
120 ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
121 rctx->fallback_req.base.flags = areq->base.flags &
122 CRYPTO_TFM_REQ_MAY_SLEEP;
123 rctx->fallback_req.result = areq->result;
124
125 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
126 algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash);
127 algt->stat_fb++;
128 #endif
129
130 return crypto_ahash_final(&rctx->fallback_req);
131 }
132
sun8i_ss_hash_update(struct ahash_request * areq)133 int sun8i_ss_hash_update(struct ahash_request *areq)
134 {
135 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
136 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
137 struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
138
139 ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
140 rctx->fallback_req.base.flags = areq->base.flags &
141 CRYPTO_TFM_REQ_MAY_SLEEP;
142 rctx->fallback_req.nbytes = areq->nbytes;
143 rctx->fallback_req.src = areq->src;
144
145 return crypto_ahash_update(&rctx->fallback_req);
146 }
147
sun8i_ss_hash_finup(struct ahash_request * areq)148 int sun8i_ss_hash_finup(struct ahash_request *areq)
149 {
150 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
151 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
152 struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
153 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
154 struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
155 struct sun8i_ss_alg_template *algt;
156 #endif
157
158 ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
159 rctx->fallback_req.base.flags = areq->base.flags &
160 CRYPTO_TFM_REQ_MAY_SLEEP;
161
162 rctx->fallback_req.nbytes = areq->nbytes;
163 rctx->fallback_req.src = areq->src;
164 rctx->fallback_req.result = areq->result;
165 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
166 algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash);
167 algt->stat_fb++;
168 #endif
169
170 return crypto_ahash_finup(&rctx->fallback_req);
171 }
172
sun8i_ss_hash_digest_fb(struct ahash_request * areq)173 static int sun8i_ss_hash_digest_fb(struct ahash_request *areq)
174 {
175 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
176 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
177 struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
178 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
179 struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
180 struct sun8i_ss_alg_template *algt;
181 #endif
182
183 ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
184 rctx->fallback_req.base.flags = areq->base.flags &
185 CRYPTO_TFM_REQ_MAY_SLEEP;
186
187 rctx->fallback_req.nbytes = areq->nbytes;
188 rctx->fallback_req.src = areq->src;
189 rctx->fallback_req.result = areq->result;
190 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
191 algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash);
192 algt->stat_fb++;
193 #endif
194
195 return crypto_ahash_digest(&rctx->fallback_req);
196 }
197
sun8i_ss_run_hash_task(struct sun8i_ss_dev * ss,struct sun8i_ss_hash_reqctx * rctx,const char * name)198 static int sun8i_ss_run_hash_task(struct sun8i_ss_dev *ss,
199 struct sun8i_ss_hash_reqctx *rctx,
200 const char *name)
201 {
202 int flow = rctx->flow;
203 u32 v = SS_START;
204 int i;
205
206 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
207 ss->flows[flow].stat_req++;
208 #endif
209
210 /* choose between stream0/stream1 */
211 if (flow)
212 v |= SS_FLOW1;
213 else
214 v |= SS_FLOW0;
215
216 v |= rctx->method;
217
218 for (i = 0; i < MAX_SG; i++) {
219 if (!rctx->t_dst[i].addr)
220 break;
221
222 mutex_lock(&ss->mlock);
223 if (i > 0) {
224 v |= BIT(17);
225 writel(rctx->t_dst[i - 1].addr, ss->base + SS_KEY_ADR_REG);
226 writel(rctx->t_dst[i - 1].addr, ss->base + SS_IV_ADR_REG);
227 }
228
229 dev_dbg(ss->dev,
230 "Processing SG %d on flow %d %s ctl=%x %d to %d method=%x src=%x dst=%x\n",
231 i, flow, name, v,
232 rctx->t_src[i].len, rctx->t_dst[i].len,
233 rctx->method, rctx->t_src[i].addr, rctx->t_dst[i].addr);
234
235 writel(rctx->t_src[i].addr, ss->base + SS_SRC_ADR_REG);
236 writel(rctx->t_dst[i].addr, ss->base + SS_DST_ADR_REG);
237 writel(rctx->t_src[i].len, ss->base + SS_LEN_ADR_REG);
238 writel(BIT(0) | BIT(1), ss->base + SS_INT_CTL_REG);
239
240 reinit_completion(&ss->flows[flow].complete);
241 ss->flows[flow].status = 0;
242 wmb();
243
244 writel(v, ss->base + SS_CTL_REG);
245 mutex_unlock(&ss->mlock);
246 wait_for_completion_interruptible_timeout(&ss->flows[flow].complete,
247 msecs_to_jiffies(2000));
248 if (ss->flows[flow].status == 0) {
249 dev_err(ss->dev, "DMA timeout for %s\n", name);
250 return -EFAULT;
251 }
252 }
253
254 return 0;
255 }
256
sun8i_ss_hash_need_fallback(struct ahash_request * areq)257 static bool sun8i_ss_hash_need_fallback(struct ahash_request *areq)
258 {
259 struct scatterlist *sg;
260
261 if (areq->nbytes == 0)
262 return true;
263 /* we need to reserve one SG for the padding one */
264 if (sg_nents(areq->src) > MAX_SG - 1)
265 return true;
266 sg = areq->src;
267 while (sg) {
268 /* SS can operate hash only on full block size
269 * since SS support only MD5,sha1,sha224 and sha256, blocksize
270 * is always 64
271 * TODO: handle request if last SG is not len%64
272 * but this will need to copy data on a new SG of size=64
273 */
274 if (sg->length % 64 || !IS_ALIGNED(sg->offset, sizeof(u32)))
275 return true;
276 sg = sg_next(sg);
277 }
278 return false;
279 }
280
sun8i_ss_hash_digest(struct ahash_request * areq)281 int sun8i_ss_hash_digest(struct ahash_request *areq)
282 {
283 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
284 struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
285 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
286 struct sun8i_ss_alg_template *algt;
287 struct sun8i_ss_dev *ss;
288 struct crypto_engine *engine;
289 struct scatterlist *sg;
290 int nr_sgs, e, i;
291
292 if (sun8i_ss_hash_need_fallback(areq))
293 return sun8i_ss_hash_digest_fb(areq);
294
295 nr_sgs = sg_nents(areq->src);
296 if (nr_sgs > MAX_SG - 1)
297 return sun8i_ss_hash_digest_fb(areq);
298
299 for_each_sg(areq->src, sg, nr_sgs, i) {
300 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
301 return sun8i_ss_hash_digest_fb(areq);
302 }
303
304 algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash);
305 ss = algt->ss;
306
307 e = sun8i_ss_get_engine_number(ss);
308 rctx->flow = e;
309 engine = ss->flows[e].engine;
310
311 return crypto_transfer_hash_request_to_engine(engine, areq);
312 }
313
314 /* sun8i_ss_hash_run - run an ahash request
315 * Send the data of the request to the SS along with an extra SG with padding
316 */
sun8i_ss_hash_run(struct crypto_engine * engine,void * breq)317 int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
318 {
319 struct ahash_request *areq = container_of(breq, struct ahash_request, base);
320 struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
321 struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
322 struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
323 struct sun8i_ss_alg_template *algt;
324 struct sun8i_ss_dev *ss;
325 struct scatterlist *sg;
326 int nr_sgs, err, digestsize;
327 unsigned int len;
328 u64 fill, min_fill, byte_count;
329 void *pad, *result;
330 int j, i, todo;
331 __be64 *bebits;
332 __le64 *lebits;
333 dma_addr_t addr_res, addr_pad;
334 __le32 *bf;
335
336 algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash);
337 ss = algt->ss;
338
339 digestsize = algt->alg.hash.halg.digestsize;
340 if (digestsize == SHA224_DIGEST_SIZE)
341 digestsize = SHA256_DIGEST_SIZE;
342
343 /* the padding could be up to two block. */
344 pad = kzalloc(algt->alg.hash.halg.base.cra_blocksize * 2, GFP_KERNEL | GFP_DMA);
345 if (!pad)
346 return -ENOMEM;
347 bf = (__le32 *)pad;
348
349 result = kzalloc(digestsize, GFP_KERNEL | GFP_DMA);
350 if (!result)
351 return -ENOMEM;
352
353 for (i = 0; i < MAX_SG; i++) {
354 rctx->t_dst[i].addr = 0;
355 rctx->t_dst[i].len = 0;
356 }
357
358 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
359 algt->stat_req++;
360 #endif
361
362 rctx->method = ss->variant->alg_hash[algt->ss_algo_id];
363
364 nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src), DMA_TO_DEVICE);
365 if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
366 dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
367 err = -EINVAL;
368 goto theend;
369 }
370
371 addr_res = dma_map_single(ss->dev, result, digestsize, DMA_FROM_DEVICE);
372 if (dma_mapping_error(ss->dev, addr_res)) {
373 dev_err(ss->dev, "DMA map dest\n");
374 err = -EINVAL;
375 goto theend;
376 }
377
378 len = areq->nbytes;
379 for_each_sg(areq->src, sg, nr_sgs, i) {
380 rctx->t_src[i].addr = sg_dma_address(sg);
381 todo = min(len, sg_dma_len(sg));
382 rctx->t_src[i].len = todo / 4;
383 len -= todo;
384 rctx->t_dst[i].addr = addr_res;
385 rctx->t_dst[i].len = digestsize / 4;
386 }
387 if (len > 0) {
388 dev_err(ss->dev, "remaining len %d\n", len);
389 err = -EINVAL;
390 goto theend;
391 }
392
393 byte_count = areq->nbytes;
394 j = 0;
395 bf[j++] = cpu_to_le32(0x80);
396
397 fill = 64 - (byte_count % 64);
398 min_fill = 3 * sizeof(u32);
399
400 if (fill < min_fill)
401 fill += 64;
402
403 j += (fill - min_fill) / sizeof(u32);
404
405 switch (algt->ss_algo_id) {
406 case SS_ID_HASH_MD5:
407 lebits = (__le64 *)&bf[j];
408 *lebits = cpu_to_le64(byte_count << 3);
409 j += 2;
410 break;
411 case SS_ID_HASH_SHA1:
412 case SS_ID_HASH_SHA224:
413 case SS_ID_HASH_SHA256:
414 bebits = (__be64 *)&bf[j];
415 *bebits = cpu_to_be64(byte_count << 3);
416 j += 2;
417 break;
418 }
419
420 addr_pad = dma_map_single(ss->dev, pad, j * 4, DMA_TO_DEVICE);
421 rctx->t_src[i].addr = addr_pad;
422 rctx->t_src[i].len = j;
423 rctx->t_dst[i].addr = addr_res;
424 rctx->t_dst[i].len = digestsize / 4;
425 if (dma_mapping_error(ss->dev, addr_pad)) {
426 dev_err(ss->dev, "DMA error on padding SG\n");
427 err = -EINVAL;
428 goto theend;
429 }
430
431 err = sun8i_ss_run_hash_task(ss, rctx, crypto_tfm_alg_name(areq->base.tfm));
432
433 dma_unmap_single(ss->dev, addr_pad, j * 4, DMA_TO_DEVICE);
434 dma_unmap_sg(ss->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
435 dma_unmap_single(ss->dev, addr_res, digestsize, DMA_FROM_DEVICE);
436
437 kfree(pad);
438
439 memcpy(areq->result, result, algt->alg.hash.halg.digestsize);
440 kfree(result);
441 theend:
442 crypto_finalize_hash_request(engine, breq, err);
443 return 0;
444 }
445
