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735d37b5 BW |
1 | /* |
2 | * Handle async block request by crypto hardware engine. | |
3 | * | |
4 | * Copyright (C) 2016 Linaro, Inc. | |
5 | * | |
6 | * Author: Baolin Wang <baolin.wang@linaro.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/err.h> | |
16 | #include <linux/delay.h> | |
2589ad84 | 17 | #include <crypto/engine.h> |
4cba7cf0 | 18 | #include <crypto/internal/hash.h> |
ae7e81c0 | 19 | #include <uapi/linux/sched/types.h> |
735d37b5 BW |
20 | #include "internal.h" |
21 | ||
22 | #define CRYPTO_ENGINE_MAX_QLEN 10 | |
23 | ||
735d37b5 BW |
24 | /** |
25 | * crypto_pump_requests - dequeue one request from engine queue to process | |
26 | * @engine: the hardware engine | |
27 | * @in_kthread: true if we are in the context of the request pump thread | |
28 | * | |
29 | * This function checks if there is any request in the engine queue that | |
30 | * needs processing and if so call out to the driver to initialize hardware | |
31 | * and handle each request. | |
32 | */ | |
33 | static void crypto_pump_requests(struct crypto_engine *engine, | |
34 | bool in_kthread) | |
35 | { | |
36 | struct crypto_async_request *async_req, *backlog; | |
4cba7cf0 CL |
37 | struct ahash_request *hreq; |
38 | struct ablkcipher_request *breq; | |
735d37b5 BW |
39 | unsigned long flags; |
40 | bool was_busy = false; | |
4cba7cf0 | 41 | int ret, rtype; |
735d37b5 BW |
42 | |
43 | spin_lock_irqsave(&engine->queue_lock, flags); | |
44 | ||
45 | /* Make sure we are not already running a request */ | |
46 | if (engine->cur_req) | |
47 | goto out; | |
48 | ||
49 | /* If another context is idling then defer */ | |
50 | if (engine->idling) { | |
c4ca2b0b | 51 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
735d37b5 BW |
52 | goto out; |
53 | } | |
54 | ||
55 | /* Check if the engine queue is idle */ | |
56 | if (!crypto_queue_len(&engine->queue) || !engine->running) { | |
57 | if (!engine->busy) | |
58 | goto out; | |
59 | ||
60 | /* Only do teardown in the thread */ | |
61 | if (!in_kthread) { | |
c4ca2b0b | 62 | kthread_queue_work(engine->kworker, |
735d37b5 BW |
63 | &engine->pump_requests); |
64 | goto out; | |
65 | } | |
66 | ||
67 | engine->busy = false; | |
68 | engine->idling = true; | |
69 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
70 | ||
71 | if (engine->unprepare_crypt_hardware && | |
72 | engine->unprepare_crypt_hardware(engine)) | |
73 | pr_err("failed to unprepare crypt hardware\n"); | |
74 | ||
75 | spin_lock_irqsave(&engine->queue_lock, flags); | |
76 | engine->idling = false; | |
77 | goto out; | |
78 | } | |
79 | ||
80 | /* Get the fist request from the engine queue to handle */ | |
81 | backlog = crypto_get_backlog(&engine->queue); | |
82 | async_req = crypto_dequeue_request(&engine->queue); | |
83 | if (!async_req) | |
84 | goto out; | |
85 | ||
4cba7cf0 | 86 | engine->cur_req = async_req; |
735d37b5 BW |
87 | if (backlog) |
88 | backlog->complete(backlog, -EINPROGRESS); | |
89 | ||
90 | if (engine->busy) | |
91 | was_busy = true; | |
92 | else | |
93 | engine->busy = true; | |
94 | ||
95 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
96 | ||
4cba7cf0 | 97 | rtype = crypto_tfm_alg_type(engine->cur_req->tfm); |
735d37b5 BW |
98 | /* Until here we get the request need to be encrypted successfully */ |
99 | if (!was_busy && engine->prepare_crypt_hardware) { | |
100 | ret = engine->prepare_crypt_hardware(engine); | |
101 | if (ret) { | |
102 | pr_err("failed to prepare crypt hardware\n"); | |
103 | goto req_err; | |
104 | } | |
105 | } | |
106 | ||
4cba7cf0 CL |
107 | switch (rtype) { |
108 | case CRYPTO_ALG_TYPE_AHASH: | |
109 | hreq = ahash_request_cast(engine->cur_req); | |
110 | if (engine->prepare_hash_request) { | |
111 | ret = engine->prepare_hash_request(engine, hreq); | |
112 | if (ret) { | |
113 | pr_err("failed to prepare request: %d\n", ret); | |
114 | goto req_err; | |
115 | } | |
116 | engine->cur_req_prepared = true; | |
117 | } | |
118 | ret = engine->hash_one_request(engine, hreq); | |
735d37b5 | 119 | if (ret) { |
4cba7cf0 | 120 | pr_err("failed to hash one request from queue\n"); |
735d37b5 BW |
121 | goto req_err; |
122 | } | |
4cba7cf0 CL |
123 | return; |
124 | case CRYPTO_ALG_TYPE_ABLKCIPHER: | |
125 | breq = ablkcipher_request_cast(engine->cur_req); | |
126 | if (engine->prepare_cipher_request) { | |
127 | ret = engine->prepare_cipher_request(engine, breq); | |
128 | if (ret) { | |
129 | pr_err("failed to prepare request: %d\n", ret); | |
130 | goto req_err; | |
131 | } | |
132 | engine->cur_req_prepared = true; | |
133 | } | |
134 | ret = engine->cipher_one_request(engine, breq); | |
135 | if (ret) { | |
136 | pr_err("failed to cipher one request from queue\n"); | |
137 | goto req_err; | |
138 | } | |
139 | return; | |
140 | default: | |
141 | pr_err("failed to prepare request of unknown type\n"); | |
142 | return; | |
735d37b5 | 143 | } |
735d37b5 BW |
144 | |
145 | req_err: | |
4cba7cf0 CL |
146 | switch (rtype) { |
147 | case CRYPTO_ALG_TYPE_AHASH: | |
148 | hreq = ahash_request_cast(engine->cur_req); | |
149 | crypto_finalize_hash_request(engine, hreq, ret); | |
150 | break; | |
151 | case CRYPTO_ALG_TYPE_ABLKCIPHER: | |
152 | breq = ablkcipher_request_cast(engine->cur_req); | |
153 | crypto_finalize_cipher_request(engine, breq, ret); | |
154 | break; | |
155 | } | |
735d37b5 BW |
156 | return; |
157 | ||
158 | out: | |
159 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
160 | } | |
161 | ||
162 | static void crypto_pump_work(struct kthread_work *work) | |
163 | { | |
164 | struct crypto_engine *engine = | |
165 | container_of(work, struct crypto_engine, pump_requests); | |
166 | ||
167 | crypto_pump_requests(engine, true); | |
168 | } | |
169 | ||
170 | /** | |
4cba7cf0 CL |
171 | * crypto_transfer_cipher_request - transfer the new request into the |
172 | * enginequeue | |
735d37b5 BW |
173 | * @engine: the hardware engine |
174 | * @req: the request need to be listed into the engine queue | |
175 | */ | |
4cba7cf0 CL |
176 | int crypto_transfer_cipher_request(struct crypto_engine *engine, |
177 | struct ablkcipher_request *req, | |
178 | bool need_pump) | |
735d37b5 BW |
179 | { |
180 | unsigned long flags; | |
181 | int ret; | |
182 | ||
183 | spin_lock_irqsave(&engine->queue_lock, flags); | |
184 | ||
185 | if (!engine->running) { | |
186 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
187 | return -ESHUTDOWN; | |
188 | } | |
189 | ||
190 | ret = ablkcipher_enqueue_request(&engine->queue, req); | |
191 | ||
192 | if (!engine->busy && need_pump) | |
c4ca2b0b | 193 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
735d37b5 BW |
194 | |
195 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
196 | return ret; | |
197 | } | |
4cba7cf0 CL |
198 | EXPORT_SYMBOL_GPL(crypto_transfer_cipher_request); |
199 | ||
200 | /** | |
201 | * crypto_transfer_cipher_request_to_engine - transfer one request to list | |
202 | * into the engine queue | |
203 | * @engine: the hardware engine | |
204 | * @req: the request need to be listed into the engine queue | |
205 | */ | |
206 | int crypto_transfer_cipher_request_to_engine(struct crypto_engine *engine, | |
207 | struct ablkcipher_request *req) | |
208 | { | |
209 | return crypto_transfer_cipher_request(engine, req, true); | |
210 | } | |
211 | EXPORT_SYMBOL_GPL(crypto_transfer_cipher_request_to_engine); | |
212 | ||
213 | /** | |
214 | * crypto_transfer_hash_request - transfer the new request into the | |
215 | * enginequeue | |
216 | * @engine: the hardware engine | |
217 | * @req: the request need to be listed into the engine queue | |
218 | */ | |
219 | int crypto_transfer_hash_request(struct crypto_engine *engine, | |
220 | struct ahash_request *req, bool need_pump) | |
221 | { | |
222 | unsigned long flags; | |
223 | int ret; | |
224 | ||
225 | spin_lock_irqsave(&engine->queue_lock, flags); | |
226 | ||
227 | if (!engine->running) { | |
228 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
229 | return -ESHUTDOWN; | |
230 | } | |
231 | ||
232 | ret = ahash_enqueue_request(&engine->queue, req); | |
233 | ||
234 | if (!engine->busy && need_pump) | |
c4ca2b0b | 235 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
4cba7cf0 CL |
236 | |
237 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
238 | return ret; | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(crypto_transfer_hash_request); | |
735d37b5 BW |
241 | |
242 | /** | |
4cba7cf0 CL |
243 | * crypto_transfer_hash_request_to_engine - transfer one request to list |
244 | * into the engine queue | |
735d37b5 BW |
245 | * @engine: the hardware engine |
246 | * @req: the request need to be listed into the engine queue | |
247 | */ | |
4cba7cf0 CL |
248 | int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine, |
249 | struct ahash_request *req) | |
735d37b5 | 250 | { |
4cba7cf0 | 251 | return crypto_transfer_hash_request(engine, req, true); |
735d37b5 | 252 | } |
4cba7cf0 | 253 | EXPORT_SYMBOL_GPL(crypto_transfer_hash_request_to_engine); |
735d37b5 BW |
254 | |
255 | /** | |
4cba7cf0 | 256 | * crypto_finalize_cipher_request - finalize one request if the request is done |
735d37b5 BW |
257 | * @engine: the hardware engine |
258 | * @req: the request need to be finalized | |
259 | * @err: error number | |
260 | */ | |
4cba7cf0 CL |
261 | void crypto_finalize_cipher_request(struct crypto_engine *engine, |
262 | struct ablkcipher_request *req, int err) | |
735d37b5 BW |
263 | { |
264 | unsigned long flags; | |
265 | bool finalize_cur_req = false; | |
266 | int ret; | |
267 | ||
268 | spin_lock_irqsave(&engine->queue_lock, flags); | |
4cba7cf0 | 269 | if (engine->cur_req == &req->base) |
735d37b5 BW |
270 | finalize_cur_req = true; |
271 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
272 | ||
273 | if (finalize_cur_req) { | |
4cba7cf0 CL |
274 | if (engine->cur_req_prepared && |
275 | engine->unprepare_cipher_request) { | |
276 | ret = engine->unprepare_cipher_request(engine, req); | |
735d37b5 BW |
277 | if (ret) |
278 | pr_err("failed to unprepare request\n"); | |
279 | } | |
4cba7cf0 CL |
280 | spin_lock_irqsave(&engine->queue_lock, flags); |
281 | engine->cur_req = NULL; | |
282 | engine->cur_req_prepared = false; | |
283 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
284 | } | |
285 | ||
286 | req->base.complete(&req->base, err); | |
735d37b5 | 287 | |
c4ca2b0b | 288 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
4cba7cf0 CL |
289 | } |
290 | EXPORT_SYMBOL_GPL(crypto_finalize_cipher_request); | |
291 | ||
292 | /** | |
293 | * crypto_finalize_hash_request - finalize one request if the request is done | |
294 | * @engine: the hardware engine | |
295 | * @req: the request need to be finalized | |
296 | * @err: error number | |
297 | */ | |
298 | void crypto_finalize_hash_request(struct crypto_engine *engine, | |
299 | struct ahash_request *req, int err) | |
300 | { | |
301 | unsigned long flags; | |
302 | bool finalize_cur_req = false; | |
303 | int ret; | |
304 | ||
305 | spin_lock_irqsave(&engine->queue_lock, flags); | |
306 | if (engine->cur_req == &req->base) | |
307 | finalize_cur_req = true; | |
308 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
309 | ||
310 | if (finalize_cur_req) { | |
311 | if (engine->cur_req_prepared && | |
312 | engine->unprepare_hash_request) { | |
313 | ret = engine->unprepare_hash_request(engine, req); | |
314 | if (ret) | |
315 | pr_err("failed to unprepare request\n"); | |
316 | } | |
735d37b5 BW |
317 | spin_lock_irqsave(&engine->queue_lock, flags); |
318 | engine->cur_req = NULL; | |
319 | engine->cur_req_prepared = false; | |
320 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
321 | } | |
322 | ||
323 | req->base.complete(&req->base, err); | |
324 | ||
c4ca2b0b | 325 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
735d37b5 | 326 | } |
4cba7cf0 | 327 | EXPORT_SYMBOL_GPL(crypto_finalize_hash_request); |
735d37b5 BW |
328 | |
329 | /** | |
330 | * crypto_engine_start - start the hardware engine | |
331 | * @engine: the hardware engine need to be started | |
332 | * | |
333 | * Return 0 on success, else on fail. | |
334 | */ | |
335 | int crypto_engine_start(struct crypto_engine *engine) | |
336 | { | |
337 | unsigned long flags; | |
338 | ||
339 | spin_lock_irqsave(&engine->queue_lock, flags); | |
340 | ||
341 | if (engine->running || engine->busy) { | |
342 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
343 | return -EBUSY; | |
344 | } | |
345 | ||
346 | engine->running = true; | |
347 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
348 | ||
c4ca2b0b | 349 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
735d37b5 BW |
350 | |
351 | return 0; | |
352 | } | |
353 | EXPORT_SYMBOL_GPL(crypto_engine_start); | |
354 | ||
355 | /** | |
356 | * crypto_engine_stop - stop the hardware engine | |
357 | * @engine: the hardware engine need to be stopped | |
358 | * | |
359 | * Return 0 on success, else on fail. | |
360 | */ | |
361 | int crypto_engine_stop(struct crypto_engine *engine) | |
362 | { | |
363 | unsigned long flags; | |
4cba7cf0 | 364 | unsigned int limit = 500; |
735d37b5 BW |
365 | int ret = 0; |
366 | ||
367 | spin_lock_irqsave(&engine->queue_lock, flags); | |
368 | ||
369 | /* | |
370 | * If the engine queue is not empty or the engine is on busy state, | |
371 | * we need to wait for a while to pump the requests of engine queue. | |
372 | */ | |
373 | while ((crypto_queue_len(&engine->queue) || engine->busy) && limit--) { | |
374 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
375 | msleep(20); | |
376 | spin_lock_irqsave(&engine->queue_lock, flags); | |
377 | } | |
378 | ||
379 | if (crypto_queue_len(&engine->queue) || engine->busy) | |
380 | ret = -EBUSY; | |
381 | else | |
382 | engine->running = false; | |
383 | ||
384 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
385 | ||
386 | if (ret) | |
387 | pr_warn("could not stop engine\n"); | |
388 | ||
389 | return ret; | |
390 | } | |
391 | EXPORT_SYMBOL_GPL(crypto_engine_stop); | |
392 | ||
393 | /** | |
394 | * crypto_engine_alloc_init - allocate crypto hardware engine structure and | |
395 | * initialize it. | |
396 | * @dev: the device attached with one hardware engine | |
397 | * @rt: whether this queue is set to run as a realtime task | |
398 | * | |
399 | * This must be called from context that can sleep. | |
400 | * Return: the crypto engine structure on success, else NULL. | |
401 | */ | |
402 | struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt) | |
403 | { | |
404 | struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 }; | |
405 | struct crypto_engine *engine; | |
406 | ||
407 | if (!dev) | |
408 | return NULL; | |
409 | ||
410 | engine = devm_kzalloc(dev, sizeof(*engine), GFP_KERNEL); | |
411 | if (!engine) | |
412 | return NULL; | |
413 | ||
414 | engine->rt = rt; | |
415 | engine->running = false; | |
416 | engine->busy = false; | |
417 | engine->idling = false; | |
418 | engine->cur_req_prepared = false; | |
419 | engine->priv_data = dev; | |
420 | snprintf(engine->name, sizeof(engine->name), | |
421 | "%s-engine", dev_name(dev)); | |
422 | ||
423 | crypto_init_queue(&engine->queue, CRYPTO_ENGINE_MAX_QLEN); | |
424 | spin_lock_init(&engine->queue_lock); | |
425 | ||
c4ca2b0b PM |
426 | engine->kworker = kthread_create_worker(0, "%s", engine->name); |
427 | if (IS_ERR(engine->kworker)) { | |
735d37b5 BW |
428 | dev_err(dev, "failed to create crypto request pump task\n"); |
429 | return NULL; | |
430 | } | |
3989144f | 431 | kthread_init_work(&engine->pump_requests, crypto_pump_work); |
735d37b5 BW |
432 | |
433 | if (engine->rt) { | |
434 | dev_info(dev, "will run requests pump with realtime priority\n"); | |
c4ca2b0b | 435 | sched_setscheduler(engine->kworker->task, SCHED_FIFO, ¶m); |
735d37b5 BW |
436 | } |
437 | ||
438 | return engine; | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(crypto_engine_alloc_init); | |
441 | ||
442 | /** | |
443 | * crypto_engine_exit - free the resources of hardware engine when exit | |
444 | * @engine: the hardware engine need to be freed | |
445 | * | |
446 | * Return 0 for success. | |
447 | */ | |
448 | int crypto_engine_exit(struct crypto_engine *engine) | |
449 | { | |
450 | int ret; | |
451 | ||
452 | ret = crypto_engine_stop(engine); | |
453 | if (ret) | |
454 | return ret; | |
455 | ||
c4ca2b0b | 456 | kthread_destroy_worker(engine->kworker); |
735d37b5 BW |
457 | |
458 | return 0; | |
459 | } | |
460 | EXPORT_SYMBOL_GPL(crypto_engine_exit); | |
461 | ||
462 | MODULE_LICENSE("GPL"); | |
463 | MODULE_DESCRIPTION("Crypto hardware engine framework"); |