Merge tag 'core_guards_for_6.5_rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[platform/kernel/linux-starfive.git] / drivers / crypto / allwinner / sun8i-ce / sun8i-ce-hash.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * sun8i-ce-hash.c - hardware cryptographic offloader for
4  * Allwinner H3/A64/H5/H2+/H6/R40 SoC
5  *
6  * Copyright (C) 2015-2020 Corentin Labbe <clabbe@baylibre.com>
7  *
8  * This file add support for MD5 and SHA1/SHA224/SHA256/SHA384/SHA512.
9  *
10  * You could find the datasheet in Documentation/arch/arm/sunxi.rst
11  */
12 #include <linux/bottom_half.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/scatterlist.h>
16 #include <crypto/internal/hash.h>
17 #include <crypto/sha1.h>
18 #include <crypto/sha2.h>
19 #include <crypto/md5.h>
20 #include "sun8i-ce.h"
21
22 int sun8i_ce_hash_crainit(struct crypto_tfm *tfm)
23 {
24         struct sun8i_ce_hash_tfm_ctx *op = crypto_tfm_ctx(tfm);
25         struct ahash_alg *alg = __crypto_ahash_alg(tfm->__crt_alg);
26         struct sun8i_ce_alg_template *algt;
27         int err;
28
29         memset(op, 0, sizeof(struct sun8i_ce_hash_tfm_ctx));
30
31         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
32         op->ce = algt->ce;
33
34         op->enginectx.op.do_one_request = sun8i_ce_hash_run;
35         op->enginectx.op.prepare_request = NULL;
36         op->enginectx.op.unprepare_request = NULL;
37
38         /* FALLBACK */
39         op->fallback_tfm = crypto_alloc_ahash(crypto_tfm_alg_name(tfm), 0,
40                                               CRYPTO_ALG_NEED_FALLBACK);
41         if (IS_ERR(op->fallback_tfm)) {
42                 dev_err(algt->ce->dev, "Fallback driver could no be loaded\n");
43                 return PTR_ERR(op->fallback_tfm);
44         }
45
46         if (algt->alg.hash.halg.statesize < crypto_ahash_statesize(op->fallback_tfm))
47                 algt->alg.hash.halg.statesize = crypto_ahash_statesize(op->fallback_tfm);
48
49         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
50                                  sizeof(struct sun8i_ce_hash_reqctx) +
51                                  crypto_ahash_reqsize(op->fallback_tfm));
52
53         memcpy(algt->fbname, crypto_tfm_alg_driver_name(&op->fallback_tfm->base),
54                CRYPTO_MAX_ALG_NAME);
55
56         err = pm_runtime_get_sync(op->ce->dev);
57         if (err < 0)
58                 goto error_pm;
59         return 0;
60 error_pm:
61         pm_runtime_put_noidle(op->ce->dev);
62         crypto_free_ahash(op->fallback_tfm);
63         return err;
64 }
65
66 void sun8i_ce_hash_craexit(struct crypto_tfm *tfm)
67 {
68         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_tfm_ctx(tfm);
69
70         crypto_free_ahash(tfmctx->fallback_tfm);
71         pm_runtime_put_sync_suspend(tfmctx->ce->dev);
72 }
73
74 int sun8i_ce_hash_init(struct ahash_request *areq)
75 {
76         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
77         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
78         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
79
80         memset(rctx, 0, sizeof(struct sun8i_ce_hash_reqctx));
81
82         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
83         rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
84
85         return crypto_ahash_init(&rctx->fallback_req);
86 }
87
88 int sun8i_ce_hash_export(struct ahash_request *areq, void *out)
89 {
90         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
91         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
92         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
93
94         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
95         rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
96
97         return crypto_ahash_export(&rctx->fallback_req, out);
98 }
99
100 int sun8i_ce_hash_import(struct ahash_request *areq, const void *in)
101 {
102         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
103         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
104         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
105
106         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
107         rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
108
109         return crypto_ahash_import(&rctx->fallback_req, in);
110 }
111
112 int sun8i_ce_hash_final(struct ahash_request *areq)
113 {
114         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
115         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
116         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
117 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
118         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
119         struct sun8i_ce_alg_template *algt;
120 #endif
121
122         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
123         rctx->fallback_req.base.flags = areq->base.flags &
124                                         CRYPTO_TFM_REQ_MAY_SLEEP;
125         rctx->fallback_req.result = areq->result;
126
127 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
128         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
129         algt->stat_fb++;
130 #endif
131
132         return crypto_ahash_final(&rctx->fallback_req);
133 }
134
135 int sun8i_ce_hash_update(struct ahash_request *areq)
136 {
137         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
138         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
139         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
140
141         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
142         rctx->fallback_req.base.flags = areq->base.flags &
143                                         CRYPTO_TFM_REQ_MAY_SLEEP;
144         rctx->fallback_req.nbytes = areq->nbytes;
145         rctx->fallback_req.src = areq->src;
146
147         return crypto_ahash_update(&rctx->fallback_req);
148 }
149
150 int sun8i_ce_hash_finup(struct ahash_request *areq)
151 {
152         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
153         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
154         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
155 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
156         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
157         struct sun8i_ce_alg_template *algt;
158 #endif
159
160         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
161         rctx->fallback_req.base.flags = areq->base.flags &
162                                         CRYPTO_TFM_REQ_MAY_SLEEP;
163
164         rctx->fallback_req.nbytes = areq->nbytes;
165         rctx->fallback_req.src = areq->src;
166         rctx->fallback_req.result = areq->result;
167 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
168         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
169         algt->stat_fb++;
170 #endif
171
172         return crypto_ahash_finup(&rctx->fallback_req);
173 }
174
175 static int sun8i_ce_hash_digest_fb(struct ahash_request *areq)
176 {
177         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
178         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
179         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
180 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
181         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
182         struct sun8i_ce_alg_template *algt;
183 #endif
184
185         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
186         rctx->fallback_req.base.flags = areq->base.flags &
187                                         CRYPTO_TFM_REQ_MAY_SLEEP;
188
189         rctx->fallback_req.nbytes = areq->nbytes;
190         rctx->fallback_req.src = areq->src;
191         rctx->fallback_req.result = areq->result;
192 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
193         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
194         algt->stat_fb++;
195 #endif
196
197         return crypto_ahash_digest(&rctx->fallback_req);
198 }
199
200 static bool sun8i_ce_hash_need_fallback(struct ahash_request *areq)
201 {
202         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
203         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
204         struct sun8i_ce_alg_template *algt;
205         struct scatterlist *sg;
206
207         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
208
209         if (areq->nbytes == 0) {
210                 algt->stat_fb_len0++;
211                 return true;
212         }
213         /* we need to reserve one SG for padding one */
214         if (sg_nents_for_len(areq->src, areq->nbytes) > MAX_SG - 1) {
215                 algt->stat_fb_maxsg++;
216                 return true;
217         }
218         sg = areq->src;
219         while (sg) {
220                 if (sg->length % 4) {
221                         algt->stat_fb_srclen++;
222                         return true;
223                 }
224                 if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
225                         algt->stat_fb_srcali++;
226                         return true;
227                 }
228                 sg = sg_next(sg);
229         }
230         return false;
231 }
232
233 int sun8i_ce_hash_digest(struct ahash_request *areq)
234 {
235         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
236         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
237         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
238         struct sun8i_ce_alg_template *algt;
239         struct sun8i_ce_dev *ce;
240         struct crypto_engine *engine;
241         struct scatterlist *sg;
242         int nr_sgs, e, i;
243
244         if (sun8i_ce_hash_need_fallback(areq))
245                 return sun8i_ce_hash_digest_fb(areq);
246
247         nr_sgs = sg_nents_for_len(areq->src, areq->nbytes);
248         if (nr_sgs > MAX_SG - 1)
249                 return sun8i_ce_hash_digest_fb(areq);
250
251         for_each_sg(areq->src, sg, nr_sgs, i) {
252                 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
253                         return sun8i_ce_hash_digest_fb(areq);
254         }
255
256         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
257         ce = algt->ce;
258
259         e = sun8i_ce_get_engine_number(ce);
260         rctx->flow = e;
261         engine = ce->chanlist[e].engine;
262
263         return crypto_transfer_hash_request_to_engine(engine, areq);
264 }
265
266 static u64 hash_pad(__le32 *buf, unsigned int bufsize, u64 padi, u64 byte_count, bool le, int bs)
267 {
268         u64 fill, min_fill, j, k;
269         __be64 *bebits;
270         __le64 *lebits;
271
272         j = padi;
273         buf[j++] = cpu_to_le32(0x80);
274
275         if (bs == 64) {
276                 fill = 64 - (byte_count % 64);
277                 min_fill = 2 * sizeof(u32) + sizeof(u32);
278         } else {
279                 fill = 128 - (byte_count % 128);
280                 min_fill = 4 * sizeof(u32) + sizeof(u32);
281         }
282
283         if (fill < min_fill)
284                 fill += bs;
285
286         k = j;
287         j += (fill - min_fill) / sizeof(u32);
288         if (j * 4 > bufsize) {
289                 pr_err("%s OVERFLOW %llu\n", __func__, j);
290                 return 0;
291         }
292         for (; k < j; k++)
293                 buf[k] = 0;
294
295         if (le) {
296                 /* MD5 */
297                 lebits = (__le64 *)&buf[j];
298                 *lebits = cpu_to_le64(byte_count << 3);
299                 j += 2;
300         } else {
301                 if (bs == 64) {
302                         /* sha1 sha224 sha256 */
303                         bebits = (__be64 *)&buf[j];
304                         *bebits = cpu_to_be64(byte_count << 3);
305                         j += 2;
306                 } else {
307                         /* sha384 sha512*/
308                         bebits = (__be64 *)&buf[j];
309                         *bebits = cpu_to_be64(byte_count >> 61);
310                         j += 2;
311                         bebits = (__be64 *)&buf[j];
312                         *bebits = cpu_to_be64(byte_count << 3);
313                         j += 2;
314                 }
315         }
316         if (j * 4 > bufsize) {
317                 pr_err("%s OVERFLOW %llu\n", __func__, j);
318                 return 0;
319         }
320
321         return j;
322 }
323
324 int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
325 {
326         struct ahash_request *areq = container_of(breq, struct ahash_request, base);
327         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
328         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
329         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
330         struct sun8i_ce_alg_template *algt;
331         struct sun8i_ce_dev *ce;
332         struct sun8i_ce_flow *chan;
333         struct ce_task *cet;
334         struct scatterlist *sg;
335         int nr_sgs, flow, err;
336         unsigned int len;
337         u32 common;
338         u64 byte_count;
339         __le32 *bf;
340         void *buf = NULL;
341         int j, i, todo;
342         void *result = NULL;
343         u64 bs;
344         int digestsize;
345         dma_addr_t addr_res, addr_pad;
346         int ns = sg_nents_for_len(areq->src, areq->nbytes);
347
348         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
349         ce = algt->ce;
350
351         bs = algt->alg.hash.halg.base.cra_blocksize;
352         digestsize = algt->alg.hash.halg.digestsize;
353         if (digestsize == SHA224_DIGEST_SIZE)
354                 digestsize = SHA256_DIGEST_SIZE;
355         if (digestsize == SHA384_DIGEST_SIZE)
356                 digestsize = SHA512_DIGEST_SIZE;
357
358         /* the padding could be up to two block. */
359         buf = kzalloc(bs * 2, GFP_KERNEL | GFP_DMA);
360         if (!buf) {
361                 err = -ENOMEM;
362                 goto theend;
363         }
364         bf = (__le32 *)buf;
365
366         result = kzalloc(digestsize, GFP_KERNEL | GFP_DMA);
367         if (!result) {
368                 err = -ENOMEM;
369                 goto theend;
370         }
371
372         flow = rctx->flow;
373         chan = &ce->chanlist[flow];
374
375 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
376         algt->stat_req++;
377 #endif
378         dev_dbg(ce->dev, "%s %s len=%d\n", __func__, crypto_tfm_alg_name(areq->base.tfm), areq->nbytes);
379
380         cet = chan->tl;
381         memset(cet, 0, sizeof(struct ce_task));
382
383         cet->t_id = cpu_to_le32(flow);
384         common = ce->variant->alg_hash[algt->ce_algo_id];
385         common |= CE_COMM_INT;
386         cet->t_common_ctl = cpu_to_le32(common);
387
388         cet->t_sym_ctl = 0;
389         cet->t_asym_ctl = 0;
390
391         nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
392         if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
393                 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
394                 err = -EINVAL;
395                 goto theend;
396         }
397
398         len = areq->nbytes;
399         for_each_sg(areq->src, sg, nr_sgs, i) {
400                 cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg));
401                 todo = min(len, sg_dma_len(sg));
402                 cet->t_src[i].len = cpu_to_le32(todo / 4);
403                 len -= todo;
404         }
405         if (len > 0) {
406                 dev_err(ce->dev, "remaining len %d\n", len);
407                 err = -EINVAL;
408                 goto theend;
409         }
410         addr_res = dma_map_single(ce->dev, result, digestsize, DMA_FROM_DEVICE);
411         cet->t_dst[0].addr = cpu_to_le32(addr_res);
412         cet->t_dst[0].len = cpu_to_le32(digestsize / 4);
413         if (dma_mapping_error(ce->dev, addr_res)) {
414                 dev_err(ce->dev, "DMA map dest\n");
415                 err = -EINVAL;
416                 goto theend;
417         }
418
419         byte_count = areq->nbytes;
420         j = 0;
421
422         switch (algt->ce_algo_id) {
423         case CE_ID_HASH_MD5:
424                 j = hash_pad(bf, 2 * bs, j, byte_count, true, bs);
425                 break;
426         case CE_ID_HASH_SHA1:
427         case CE_ID_HASH_SHA224:
428         case CE_ID_HASH_SHA256:
429                 j = hash_pad(bf, 2 * bs, j, byte_count, false, bs);
430                 break;
431         case CE_ID_HASH_SHA384:
432         case CE_ID_HASH_SHA512:
433                 j = hash_pad(bf, 2 * bs, j, byte_count, false, bs);
434                 break;
435         }
436         if (!j) {
437                 err = -EINVAL;
438                 goto theend;
439         }
440
441         addr_pad = dma_map_single(ce->dev, buf, j * 4, DMA_TO_DEVICE);
442         cet->t_src[i].addr = cpu_to_le32(addr_pad);
443         cet->t_src[i].len = cpu_to_le32(j);
444         if (dma_mapping_error(ce->dev, addr_pad)) {
445                 dev_err(ce->dev, "DMA error on padding SG\n");
446                 err = -EINVAL;
447                 goto theend;
448         }
449
450         if (ce->variant->hash_t_dlen_in_bits)
451                 cet->t_dlen = cpu_to_le32((areq->nbytes + j * 4) * 8);
452         else
453                 cet->t_dlen = cpu_to_le32(areq->nbytes / 4 + j);
454
455         chan->timeout = areq->nbytes;
456
457         err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(areq->base.tfm));
458
459         dma_unmap_single(ce->dev, addr_pad, j * 4, DMA_TO_DEVICE);
460         dma_unmap_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
461         dma_unmap_single(ce->dev, addr_res, digestsize, DMA_FROM_DEVICE);
462
463
464         memcpy(areq->result, result, algt->alg.hash.halg.digestsize);
465 theend:
466         kfree(buf);
467         kfree(result);
468         local_bh_disable();
469         crypto_finalize_hash_request(engine, breq, err);
470         local_bh_enable();
471         return 0;
472 }