Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
735d37b5 BW |
2 | /* |
3 | * Handle async block request by crypto hardware engine. | |
4 | * | |
5 | * Copyright (C) 2016 Linaro, Inc. | |
6 | * | |
7 | * Author: Baolin Wang <baolin.wang@linaro.org> | |
735d37b5 BW |
8 | */ |
9 | ||
10 | #include <linux/err.h> | |
11 | #include <linux/delay.h> | |
0c3dc787 | 12 | #include <linux/device.h> |
2589ad84 | 13 | #include <crypto/engine.h> |
ae7e81c0 | 14 | #include <uapi/linux/sched/types.h> |
735d37b5 BW |
15 | #include "internal.h" |
16 | ||
17 | #define CRYPTO_ENGINE_MAX_QLEN 10 | |
18 | ||
218d1cc1 CL |
19 | /** |
20 | * crypto_finalize_request - finalize one request if the request is done | |
21 | * @engine: the hardware engine | |
22 | * @req: the request need to be finalized | |
23 | * @err: error number | |
24 | */ | |
25 | static void crypto_finalize_request(struct crypto_engine *engine, | |
6a89f492 | 26 | struct crypto_async_request *req, int err) |
218d1cc1 CL |
27 | { |
28 | unsigned long flags; | |
6a89f492 | 29 | bool finalize_req = false; |
218d1cc1 CL |
30 | int ret; |
31 | struct crypto_engine_ctx *enginectx; | |
32 | ||
6a89f492 IP |
33 | /* |
34 | * If hardware cannot enqueue more requests | |
35 | * and retry mechanism is not supported | |
36 | * make sure we are completing the current request | |
37 | */ | |
38 | if (!engine->retry_support) { | |
39 | spin_lock_irqsave(&engine->queue_lock, flags); | |
40 | if (engine->cur_req == req) { | |
41 | finalize_req = true; | |
42 | engine->cur_req = NULL; | |
43 | } | |
44 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
45 | } | |
218d1cc1 | 46 | |
6a89f492 | 47 | if (finalize_req || engine->retry_support) { |
218d1cc1 | 48 | enginectx = crypto_tfm_ctx(req->tfm); |
6a89f492 | 49 | if (enginectx->op.prepare_request && |
218d1cc1 CL |
50 | enginectx->op.unprepare_request) { |
51 | ret = enginectx->op.unprepare_request(engine, req); | |
52 | if (ret) | |
53 | dev_err(engine->dev, "failed to unprepare request\n"); | |
54 | } | |
218d1cc1 | 55 | } |
4058cf08 | 56 | lockdep_assert_in_softirq(); |
218d1cc1 CL |
57 | req->complete(req, err); |
58 | ||
59 | kthread_queue_work(engine->kworker, &engine->pump_requests); | |
60 | } | |
61 | ||
735d37b5 BW |
62 | /** |
63 | * crypto_pump_requests - dequeue one request from engine queue to process | |
64 | * @engine: the hardware engine | |
65 | * @in_kthread: true if we are in the context of the request pump thread | |
66 | * | |
67 | * This function checks if there is any request in the engine queue that | |
68 | * needs processing and if so call out to the driver to initialize hardware | |
69 | * and handle each request. | |
70 | */ | |
71 | static void crypto_pump_requests(struct crypto_engine *engine, | |
72 | bool in_kthread) | |
73 | { | |
74 | struct crypto_async_request *async_req, *backlog; | |
735d37b5 BW |
75 | unsigned long flags; |
76 | bool was_busy = false; | |
218d1cc1 CL |
77 | int ret; |
78 | struct crypto_engine_ctx *enginectx; | |
735d37b5 BW |
79 | |
80 | spin_lock_irqsave(&engine->queue_lock, flags); | |
81 | ||
82 | /* Make sure we are not already running a request */ | |
6a89f492 | 83 | if (!engine->retry_support && engine->cur_req) |
735d37b5 BW |
84 | goto out; |
85 | ||
86 | /* If another context is idling then defer */ | |
87 | if (engine->idling) { | |
c4ca2b0b | 88 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
735d37b5 BW |
89 | goto out; |
90 | } | |
91 | ||
92 | /* Check if the engine queue is idle */ | |
93 | if (!crypto_queue_len(&engine->queue) || !engine->running) { | |
94 | if (!engine->busy) | |
95 | goto out; | |
96 | ||
97 | /* Only do teardown in the thread */ | |
98 | if (!in_kthread) { | |
c4ca2b0b | 99 | kthread_queue_work(engine->kworker, |
735d37b5 BW |
100 | &engine->pump_requests); |
101 | goto out; | |
102 | } | |
103 | ||
104 | engine->busy = false; | |
105 | engine->idling = true; | |
106 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
107 | ||
108 | if (engine->unprepare_crypt_hardware && | |
109 | engine->unprepare_crypt_hardware(engine)) | |
88d58ef8 | 110 | dev_err(engine->dev, "failed to unprepare crypt hardware\n"); |
735d37b5 BW |
111 | |
112 | spin_lock_irqsave(&engine->queue_lock, flags); | |
113 | engine->idling = false; | |
114 | goto out; | |
115 | } | |
116 | ||
6a89f492 | 117 | start_request: |
735d37b5 BW |
118 | /* Get the fist request from the engine queue to handle */ |
119 | backlog = crypto_get_backlog(&engine->queue); | |
120 | async_req = crypto_dequeue_request(&engine->queue); | |
121 | if (!async_req) | |
122 | goto out; | |
123 | ||
6a89f492 IP |
124 | /* |
125 | * If hardware doesn't support the retry mechanism, | |
126 | * keep track of the request we are processing now. | |
127 | * We'll need it on completion (crypto_finalize_request). | |
128 | */ | |
129 | if (!engine->retry_support) | |
130 | engine->cur_req = async_req; | |
131 | ||
735d37b5 BW |
132 | if (backlog) |
133 | backlog->complete(backlog, -EINPROGRESS); | |
134 | ||
135 | if (engine->busy) | |
136 | was_busy = true; | |
137 | else | |
138 | engine->busy = true; | |
139 | ||
140 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
141 | ||
142 | /* Until here we get the request need to be encrypted successfully */ | |
143 | if (!was_busy && engine->prepare_crypt_hardware) { | |
144 | ret = engine->prepare_crypt_hardware(engine); | |
145 | if (ret) { | |
88d58ef8 | 146 | dev_err(engine->dev, "failed to prepare crypt hardware\n"); |
6a89f492 | 147 | goto req_err_2; |
735d37b5 BW |
148 | } |
149 | } | |
150 | ||
218d1cc1 CL |
151 | enginectx = crypto_tfm_ctx(async_req->tfm); |
152 | ||
153 | if (enginectx->op.prepare_request) { | |
154 | ret = enginectx->op.prepare_request(engine, async_req); | |
4cba7cf0 | 155 | if (ret) { |
218d1cc1 CL |
156 | dev_err(engine->dev, "failed to prepare request: %d\n", |
157 | ret); | |
6a89f492 | 158 | goto req_err_2; |
4cba7cf0 | 159 | } |
218d1cc1 CL |
160 | } |
161 | if (!enginectx->op.do_one_request) { | |
162 | dev_err(engine->dev, "failed to do request\n"); | |
163 | ret = -EINVAL; | |
6a89f492 | 164 | goto req_err_1; |
735d37b5 | 165 | } |
6a89f492 | 166 | |
218d1cc1 | 167 | ret = enginectx->op.do_one_request(engine, async_req); |
6a89f492 IP |
168 | |
169 | /* Request unsuccessfully executed by hardware */ | |
170 | if (ret < 0) { | |
171 | /* | |
172 | * If hardware queue is full (-ENOSPC), requeue request | |
173 | * regardless of backlog flag. | |
6a89f492 IP |
174 | * Otherwise, unprepare and complete the request. |
175 | */ | |
176 | if (!engine->retry_support || | |
d1c72f6e | 177 | (ret != -ENOSPC)) { |
6a89f492 IP |
178 | dev_err(engine->dev, |
179 | "Failed to do one request from queue: %d\n", | |
180 | ret); | |
181 | goto req_err_1; | |
182 | } | |
183 | /* | |
184 | * If retry mechanism is supported, | |
185 | * unprepare current request and | |
186 | * enqueue it back into crypto-engine queue. | |
187 | */ | |
188 | if (enginectx->op.unprepare_request) { | |
189 | ret = enginectx->op.unprepare_request(engine, | |
190 | async_req); | |
191 | if (ret) | |
192 | dev_err(engine->dev, | |
193 | "failed to unprepare request\n"); | |
194 | } | |
195 | spin_lock_irqsave(&engine->queue_lock, flags); | |
196 | /* | |
197 | * If hardware was unable to execute request, enqueue it | |
198 | * back in front of crypto-engine queue, to keep the order | |
199 | * of requests. | |
200 | */ | |
201 | crypto_enqueue_request_head(&engine->queue, async_req); | |
202 | ||
203 | kthread_queue_work(engine->kworker, &engine->pump_requests); | |
204 | goto out; | |
218d1cc1 | 205 | } |
735d37b5 | 206 | |
6a89f492 IP |
207 | goto retry; |
208 | ||
209 | req_err_1: | |
210 | if (enginectx->op.unprepare_request) { | |
211 | ret = enginectx->op.unprepare_request(engine, async_req); | |
212 | if (ret) | |
213 | dev_err(engine->dev, "failed to unprepare request\n"); | |
214 | } | |
215 | ||
216 | req_err_2: | |
217 | async_req->complete(async_req, ret); | |
218 | ||
219 | retry: | |
220 | /* If retry mechanism is supported, send new requests to engine */ | |
221 | if (engine->retry_support) { | |
222 | spin_lock_irqsave(&engine->queue_lock, flags); | |
223 | goto start_request; | |
224 | } | |
735d37b5 BW |
225 | return; |
226 | ||
227 | out: | |
228 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
8d908226 IP |
229 | |
230 | /* | |
231 | * Batch requests is possible only if | |
232 | * hardware can enqueue multiple requests | |
233 | */ | |
234 | if (engine->do_batch_requests) { | |
235 | ret = engine->do_batch_requests(engine); | |
236 | if (ret) | |
237 | dev_err(engine->dev, "failed to do batch requests: %d\n", | |
238 | ret); | |
239 | } | |
240 | ||
6a89f492 | 241 | return; |
735d37b5 BW |
242 | } |
243 | ||
244 | static void crypto_pump_work(struct kthread_work *work) | |
245 | { | |
246 | struct crypto_engine *engine = | |
247 | container_of(work, struct crypto_engine, pump_requests); | |
248 | ||
249 | crypto_pump_requests(engine, true); | |
250 | } | |
251 | ||
252 | /** | |
218d1cc1 | 253 | * crypto_transfer_request - transfer the new request into the engine queue |
735d37b5 BW |
254 | * @engine: the hardware engine |
255 | * @req: the request need to be listed into the engine queue | |
256 | */ | |
218d1cc1 CL |
257 | static int crypto_transfer_request(struct crypto_engine *engine, |
258 | struct crypto_async_request *req, | |
4cba7cf0 | 259 | bool need_pump) |
735d37b5 BW |
260 | { |
261 | unsigned long flags; | |
262 | int ret; | |
263 | ||
264 | spin_lock_irqsave(&engine->queue_lock, flags); | |
265 | ||
266 | if (!engine->running) { | |
267 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
268 | return -ESHUTDOWN; | |
269 | } | |
270 | ||
218d1cc1 | 271 | ret = crypto_enqueue_request(&engine->queue, req); |
735d37b5 BW |
272 | |
273 | if (!engine->busy && need_pump) | |
c4ca2b0b | 274 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
735d37b5 BW |
275 | |
276 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
277 | return ret; | |
278 | } | |
4cba7cf0 CL |
279 | |
280 | /** | |
218d1cc1 | 281 | * crypto_transfer_request_to_engine - transfer one request to list |
4cba7cf0 CL |
282 | * into the engine queue |
283 | * @engine: the hardware engine | |
284 | * @req: the request need to be listed into the engine queue | |
285 | */ | |
218d1cc1 CL |
286 | static int crypto_transfer_request_to_engine(struct crypto_engine *engine, |
287 | struct crypto_async_request *req) | |
4cba7cf0 | 288 | { |
218d1cc1 | 289 | return crypto_transfer_request(engine, req, true); |
4cba7cf0 | 290 | } |
4cba7cf0 | 291 | |
218d1cc1 CL |
292 | /** |
293 | * crypto_transfer_aead_request_to_engine - transfer one aead_request | |
294 | * to list into the engine queue | |
295 | * @engine: the hardware engine | |
296 | * @req: the request need to be listed into the engine queue | |
297 | */ | |
298 | int crypto_transfer_aead_request_to_engine(struct crypto_engine *engine, | |
299 | struct aead_request *req) | |
300 | { | |
301 | return crypto_transfer_request_to_engine(engine, &req->base); | |
302 | } | |
303 | EXPORT_SYMBOL_GPL(crypto_transfer_aead_request_to_engine); | |
4cba7cf0 | 304 | |
218d1cc1 CL |
305 | /** |
306 | * crypto_transfer_akcipher_request_to_engine - transfer one akcipher_request | |
307 | * to list into the engine queue | |
308 | * @engine: the hardware engine | |
309 | * @req: the request need to be listed into the engine queue | |
310 | */ | |
311 | int crypto_transfer_akcipher_request_to_engine(struct crypto_engine *engine, | |
312 | struct akcipher_request *req) | |
313 | { | |
314 | return crypto_transfer_request_to_engine(engine, &req->base); | |
4cba7cf0 | 315 | } |
218d1cc1 | 316 | EXPORT_SYMBOL_GPL(crypto_transfer_akcipher_request_to_engine); |
735d37b5 BW |
317 | |
318 | /** | |
218d1cc1 CL |
319 | * crypto_transfer_hash_request_to_engine - transfer one ahash_request |
320 | * to list into the engine queue | |
735d37b5 BW |
321 | * @engine: the hardware engine |
322 | * @req: the request need to be listed into the engine queue | |
323 | */ | |
4cba7cf0 CL |
324 | int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine, |
325 | struct ahash_request *req) | |
735d37b5 | 326 | { |
218d1cc1 | 327 | return crypto_transfer_request_to_engine(engine, &req->base); |
735d37b5 | 328 | } |
4cba7cf0 | 329 | EXPORT_SYMBOL_GPL(crypto_transfer_hash_request_to_engine); |
735d37b5 | 330 | |
1730c5aa PK |
331 | /** |
332 | * crypto_transfer_kpp_request_to_engine - transfer one kpp_request to list | |
333 | * into the engine queue | |
334 | * @engine: the hardware engine | |
335 | * @req: the request need to be listed into the engine queue | |
336 | */ | |
337 | int crypto_transfer_kpp_request_to_engine(struct crypto_engine *engine, | |
338 | struct kpp_request *req) | |
339 | { | |
340 | return crypto_transfer_request_to_engine(engine, &req->base); | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(crypto_transfer_kpp_request_to_engine); | |
343 | ||
735d37b5 | 344 | /** |
218d1cc1 CL |
345 | * crypto_transfer_skcipher_request_to_engine - transfer one skcipher_request |
346 | * to list into the engine queue | |
347 | * @engine: the hardware engine | |
348 | * @req: the request need to be listed into the engine queue | |
349 | */ | |
350 | int crypto_transfer_skcipher_request_to_engine(struct crypto_engine *engine, | |
351 | struct skcipher_request *req) | |
352 | { | |
353 | return crypto_transfer_request_to_engine(engine, &req->base); | |
354 | } | |
355 | EXPORT_SYMBOL_GPL(crypto_transfer_skcipher_request_to_engine); | |
356 | ||
218d1cc1 CL |
357 | /** |
358 | * crypto_finalize_aead_request - finalize one aead_request if | |
359 | * the request is done | |
360 | * @engine: the hardware engine | |
361 | * @req: the request need to be finalized | |
362 | * @err: error number | |
363 | */ | |
364 | void crypto_finalize_aead_request(struct crypto_engine *engine, | |
365 | struct aead_request *req, int err) | |
366 | { | |
367 | return crypto_finalize_request(engine, &req->base, err); | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(crypto_finalize_aead_request); | |
735d37b5 | 370 | |
218d1cc1 CL |
371 | /** |
372 | * crypto_finalize_akcipher_request - finalize one akcipher_request if | |
373 | * the request is done | |
374 | * @engine: the hardware engine | |
375 | * @req: the request need to be finalized | |
376 | * @err: error number | |
377 | */ | |
378 | void crypto_finalize_akcipher_request(struct crypto_engine *engine, | |
379 | struct akcipher_request *req, int err) | |
380 | { | |
381 | return crypto_finalize_request(engine, &req->base, err); | |
4cba7cf0 | 382 | } |
218d1cc1 | 383 | EXPORT_SYMBOL_GPL(crypto_finalize_akcipher_request); |
4cba7cf0 CL |
384 | |
385 | /** | |
218d1cc1 CL |
386 | * crypto_finalize_hash_request - finalize one ahash_request if |
387 | * the request is done | |
4cba7cf0 CL |
388 | * @engine: the hardware engine |
389 | * @req: the request need to be finalized | |
390 | * @err: error number | |
391 | */ | |
392 | void crypto_finalize_hash_request(struct crypto_engine *engine, | |
393 | struct ahash_request *req, int err) | |
394 | { | |
218d1cc1 | 395 | return crypto_finalize_request(engine, &req->base, err); |
735d37b5 | 396 | } |
4cba7cf0 | 397 | EXPORT_SYMBOL_GPL(crypto_finalize_hash_request); |
735d37b5 | 398 | |
1730c5aa PK |
399 | /** |
400 | * crypto_finalize_kpp_request - finalize one kpp_request if the request is done | |
401 | * @engine: the hardware engine | |
402 | * @req: the request need to be finalized | |
403 | * @err: error number | |
404 | */ | |
405 | void crypto_finalize_kpp_request(struct crypto_engine *engine, | |
406 | struct kpp_request *req, int err) | |
407 | { | |
408 | return crypto_finalize_request(engine, &req->base, err); | |
409 | } | |
410 | EXPORT_SYMBOL_GPL(crypto_finalize_kpp_request); | |
411 | ||
218d1cc1 CL |
412 | /** |
413 | * crypto_finalize_skcipher_request - finalize one skcipher_request if | |
414 | * the request is done | |
415 | * @engine: the hardware engine | |
416 | * @req: the request need to be finalized | |
417 | * @err: error number | |
418 | */ | |
419 | void crypto_finalize_skcipher_request(struct crypto_engine *engine, | |
420 | struct skcipher_request *req, int err) | |
421 | { | |
422 | return crypto_finalize_request(engine, &req->base, err); | |
423 | } | |
424 | EXPORT_SYMBOL_GPL(crypto_finalize_skcipher_request); | |
425 | ||
735d37b5 BW |
426 | /** |
427 | * crypto_engine_start - start the hardware engine | |
428 | * @engine: the hardware engine need to be started | |
429 | * | |
430 | * Return 0 on success, else on fail. | |
431 | */ | |
432 | int crypto_engine_start(struct crypto_engine *engine) | |
433 | { | |
434 | unsigned long flags; | |
435 | ||
436 | spin_lock_irqsave(&engine->queue_lock, flags); | |
437 | ||
438 | if (engine->running || engine->busy) { | |
439 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
440 | return -EBUSY; | |
441 | } | |
442 | ||
443 | engine->running = true; | |
444 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
445 | ||
c4ca2b0b | 446 | kthread_queue_work(engine->kworker, &engine->pump_requests); |
735d37b5 BW |
447 | |
448 | return 0; | |
449 | } | |
450 | EXPORT_SYMBOL_GPL(crypto_engine_start); | |
451 | ||
452 | /** | |
453 | * crypto_engine_stop - stop the hardware engine | |
454 | * @engine: the hardware engine need to be stopped | |
455 | * | |
456 | * Return 0 on success, else on fail. | |
457 | */ | |
458 | int crypto_engine_stop(struct crypto_engine *engine) | |
459 | { | |
460 | unsigned long flags; | |
4cba7cf0 | 461 | unsigned int limit = 500; |
735d37b5 BW |
462 | int ret = 0; |
463 | ||
464 | spin_lock_irqsave(&engine->queue_lock, flags); | |
465 | ||
466 | /* | |
467 | * If the engine queue is not empty or the engine is on busy state, | |
468 | * we need to wait for a while to pump the requests of engine queue. | |
469 | */ | |
470 | while ((crypto_queue_len(&engine->queue) || engine->busy) && limit--) { | |
471 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
472 | msleep(20); | |
473 | spin_lock_irqsave(&engine->queue_lock, flags); | |
474 | } | |
475 | ||
476 | if (crypto_queue_len(&engine->queue) || engine->busy) | |
477 | ret = -EBUSY; | |
478 | else | |
479 | engine->running = false; | |
480 | ||
481 | spin_unlock_irqrestore(&engine->queue_lock, flags); | |
482 | ||
483 | if (ret) | |
88d58ef8 | 484 | dev_warn(engine->dev, "could not stop engine\n"); |
735d37b5 BW |
485 | |
486 | return ret; | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(crypto_engine_stop); | |
489 | ||
490 | /** | |
6a89f492 IP |
491 | * crypto_engine_alloc_init_and_set - allocate crypto hardware engine structure |
492 | * and initialize it by setting the maximum number of entries in the software | |
493 | * crypto-engine queue. | |
735d37b5 | 494 | * @dev: the device attached with one hardware engine |
6a89f492 | 495 | * @retry_support: whether hardware has support for retry mechanism |
40a3af45 | 496 | * @cbk_do_batch: pointer to a callback function to be invoked when executing |
8d908226 IP |
497 | * a batch of requests. |
498 | * This has the form: | |
499 | * callback(struct crypto_engine *engine) | |
500 | * where: | |
501 | * @engine: the crypto engine structure. | |
735d37b5 | 502 | * @rt: whether this queue is set to run as a realtime task |
6a89f492 | 503 | * @qlen: maximum size of the crypto-engine queue |
735d37b5 BW |
504 | * |
505 | * This must be called from context that can sleep. | |
506 | * Return: the crypto engine structure on success, else NULL. | |
507 | */ | |
6a89f492 IP |
508 | struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev, |
509 | bool retry_support, | |
8d908226 | 510 | int (*cbk_do_batch)(struct crypto_engine *engine), |
6a89f492 | 511 | bool rt, int qlen) |
735d37b5 | 512 | { |
735d37b5 BW |
513 | struct crypto_engine *engine; |
514 | ||
515 | if (!dev) | |
516 | return NULL; | |
517 | ||
518 | engine = devm_kzalloc(dev, sizeof(*engine), GFP_KERNEL); | |
519 | if (!engine) | |
520 | return NULL; | |
521 | ||
88d58ef8 | 522 | engine->dev = dev; |
735d37b5 BW |
523 | engine->rt = rt; |
524 | engine->running = false; | |
525 | engine->busy = false; | |
526 | engine->idling = false; | |
6a89f492 | 527 | engine->retry_support = retry_support; |
735d37b5 | 528 | engine->priv_data = dev; |
8d908226 IP |
529 | /* |
530 | * Batch requests is possible only if | |
531 | * hardware has support for retry mechanism. | |
532 | */ | |
533 | engine->do_batch_requests = retry_support ? cbk_do_batch : NULL; | |
534 | ||
735d37b5 BW |
535 | snprintf(engine->name, sizeof(engine->name), |
536 | "%s-engine", dev_name(dev)); | |
537 | ||
6a89f492 | 538 | crypto_init_queue(&engine->queue, qlen); |
735d37b5 BW |
539 | spin_lock_init(&engine->queue_lock); |
540 | ||
c4ca2b0b PM |
541 | engine->kworker = kthread_create_worker(0, "%s", engine->name); |
542 | if (IS_ERR(engine->kworker)) { | |
735d37b5 BW |
543 | dev_err(dev, "failed to create crypto request pump task\n"); |
544 | return NULL; | |
545 | } | |
3989144f | 546 | kthread_init_work(&engine->pump_requests, crypto_pump_work); |
735d37b5 BW |
547 | |
548 | if (engine->rt) { | |
549 | dev_info(dev, "will run requests pump with realtime priority\n"); | |
dbc6d0d5 | 550 | sched_set_fifo(engine->kworker->task); |
735d37b5 BW |
551 | } |
552 | ||
553 | return engine; | |
554 | } | |
6a89f492 IP |
555 | EXPORT_SYMBOL_GPL(crypto_engine_alloc_init_and_set); |
556 | ||
557 | /** | |
558 | * crypto_engine_alloc_init - allocate crypto hardware engine structure and | |
559 | * initialize it. | |
560 | * @dev: the device attached with one hardware engine | |
561 | * @rt: whether this queue is set to run as a realtime task | |
562 | * | |
563 | * This must be called from context that can sleep. | |
564 | * Return: the crypto engine structure on success, else NULL. | |
565 | */ | |
566 | struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt) | |
567 | { | |
8d908226 | 568 | return crypto_engine_alloc_init_and_set(dev, false, NULL, rt, |
6a89f492 IP |
569 | CRYPTO_ENGINE_MAX_QLEN); |
570 | } | |
735d37b5 BW |
571 | EXPORT_SYMBOL_GPL(crypto_engine_alloc_init); |
572 | ||
573 | /** | |
574 | * crypto_engine_exit - free the resources of hardware engine when exit | |
575 | * @engine: the hardware engine need to be freed | |
576 | * | |
577 | * Return 0 for success. | |
578 | */ | |
579 | int crypto_engine_exit(struct crypto_engine *engine) | |
580 | { | |
581 | int ret; | |
582 | ||
583 | ret = crypto_engine_stop(engine); | |
584 | if (ret) | |
585 | return ret; | |
586 | ||
c4ca2b0b | 587 | kthread_destroy_worker(engine->kworker); |
735d37b5 BW |
588 | |
589 | return 0; | |
590 | } | |
591 | EXPORT_SYMBOL_GPL(crypto_engine_exit); | |
592 | ||
593 | MODULE_LICENSE("GPL"); | |
594 | MODULE_DESCRIPTION("Crypto hardware engine framework"); |