2 * Software multibuffer async crypto daemon.
4 * Copyright (c) 2014 Tim Chen <tim.c.chen@linux.intel.com>
6 * Adapted from crypto daemon.
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)
15 #include <crypto/algapi.h>
16 #include <crypto/internal/hash.h>
17 #include <crypto/internal/aead.h>
18 #include <crypto/mcryptd.h>
19 #include <crypto/crypto_wq.h>
20 #include <linux/err.h>
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/list.h>
24 #include <linux/module.h>
25 #include <linux/scatterlist.h>
26 #include <linux/sched.h>
27 #include <linux/slab.h>
28 #include <linux/hardirq.h>
30 #define MCRYPTD_MAX_CPU_QLEN 100
31 #define MCRYPTD_BATCH 9
33 static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
36 struct mcryptd_flush_list {
37 struct list_head list;
41 static struct mcryptd_flush_list __percpu *mcryptd_flist;
43 struct hashd_instance_ctx {
44 struct crypto_ahash_spawn spawn;
45 struct mcryptd_queue *queue;
48 static void mcryptd_queue_worker(struct work_struct *work);
50 void mcryptd_arm_flusher(struct mcryptd_alg_cstate *cstate, unsigned long delay)
52 struct mcryptd_flush_list *flist;
54 if (!cstate->flusher_engaged) {
55 /* put the flusher on the flush list */
56 flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
57 mutex_lock(&flist->lock);
58 list_add_tail(&cstate->flush_list, &flist->list);
59 cstate->flusher_engaged = true;
60 cstate->next_flush = jiffies + delay;
61 queue_delayed_work_on(smp_processor_id(), kcrypto_wq,
62 &cstate->flush, delay);
63 mutex_unlock(&flist->lock);
66 EXPORT_SYMBOL(mcryptd_arm_flusher);
68 static int mcryptd_init_queue(struct mcryptd_queue *queue,
69 unsigned int max_cpu_qlen)
72 struct mcryptd_cpu_queue *cpu_queue;
74 queue->cpu_queue = alloc_percpu(struct mcryptd_cpu_queue);
75 pr_debug("mqueue:%p mcryptd_cpu_queue %p\n", queue, queue->cpu_queue);
76 if (!queue->cpu_queue)
78 for_each_possible_cpu(cpu) {
79 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
80 pr_debug("cpu_queue #%d %p\n", cpu, queue->cpu_queue);
81 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
82 INIT_WORK(&cpu_queue->work, mcryptd_queue_worker);
87 static void mcryptd_fini_queue(struct mcryptd_queue *queue)
90 struct mcryptd_cpu_queue *cpu_queue;
92 for_each_possible_cpu(cpu) {
93 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
94 BUG_ON(cpu_queue->queue.qlen);
96 free_percpu(queue->cpu_queue);
99 static int mcryptd_enqueue_request(struct mcryptd_queue *queue,
100 struct crypto_async_request *request,
101 struct mcryptd_hash_request_ctx *rctx)
104 struct mcryptd_cpu_queue *cpu_queue;
107 cpu_queue = this_cpu_ptr(queue->cpu_queue);
110 err = crypto_enqueue_request(&cpu_queue->queue, request);
111 pr_debug("enqueue request: cpu %d cpu_queue %p request %p\n",
112 cpu, cpu_queue, request);
113 queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
120 * Try to opportunisticlly flush the partially completed jobs if
121 * crypto daemon is the only task running.
123 static void mcryptd_opportunistic_flush(void)
125 struct mcryptd_flush_list *flist;
126 struct mcryptd_alg_cstate *cstate;
128 flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
129 while (single_task_running()) {
130 mutex_lock(&flist->lock);
131 cstate = list_first_entry_or_null(&flist->list,
132 struct mcryptd_alg_cstate, flush_list);
133 if (!cstate || !cstate->flusher_engaged) {
134 mutex_unlock(&flist->lock);
137 list_del(&cstate->flush_list);
138 cstate->flusher_engaged = false;
139 mutex_unlock(&flist->lock);
140 cstate->alg_state->flusher(cstate);
145 * Called in workqueue context, do one real cryption work (via
146 * req->complete) and reschedule itself if there are more work to
149 static void mcryptd_queue_worker(struct work_struct *work)
151 struct mcryptd_cpu_queue *cpu_queue;
152 struct crypto_async_request *req, *backlog;
156 * Need to loop through more than once for multi-buffer to
160 cpu_queue = container_of(work, struct mcryptd_cpu_queue, work);
162 while (i < MCRYPTD_BATCH || single_task_running()) {
164 * preempt_disable/enable is used to prevent
165 * being preempted by mcryptd_enqueue_request()
169 backlog = crypto_get_backlog(&cpu_queue->queue);
170 req = crypto_dequeue_request(&cpu_queue->queue);
175 mcryptd_opportunistic_flush();
180 backlog->complete(backlog, -EINPROGRESS);
181 req->complete(req, 0);
182 if (!cpu_queue->queue.qlen)
186 if (cpu_queue->queue.qlen)
187 queue_work(kcrypto_wq, &cpu_queue->work);
190 void mcryptd_flusher(struct work_struct *__work)
192 struct mcryptd_alg_cstate *alg_cpu_state;
193 struct mcryptd_alg_state *alg_state;
194 struct mcryptd_flush_list *flist;
197 cpu = smp_processor_id();
198 alg_cpu_state = container_of(to_delayed_work(__work),
199 struct mcryptd_alg_cstate, flush);
200 alg_state = alg_cpu_state->alg_state;
201 if (alg_cpu_state->cpu != cpu)
202 pr_debug("mcryptd error: work on cpu %d, should be cpu %d\n",
203 cpu, alg_cpu_state->cpu);
205 if (alg_cpu_state->flusher_engaged) {
206 flist = per_cpu_ptr(mcryptd_flist, cpu);
207 mutex_lock(&flist->lock);
208 list_del(&alg_cpu_state->flush_list);
209 alg_cpu_state->flusher_engaged = false;
210 mutex_unlock(&flist->lock);
211 alg_state->flusher(alg_cpu_state);
214 EXPORT_SYMBOL_GPL(mcryptd_flusher);
216 static inline struct mcryptd_queue *mcryptd_get_queue(struct crypto_tfm *tfm)
218 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
219 struct mcryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
224 static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
228 struct crypto_instance *inst;
231 p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
233 return ERR_PTR(-ENOMEM);
235 inst = (void *)(p + head);
238 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
239 "mcryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
242 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
244 inst->alg.cra_priority = alg->cra_priority + 50;
245 inst->alg.cra_blocksize = alg->cra_blocksize;
246 inst->alg.cra_alignmask = alg->cra_alignmask;
257 static inline void mcryptd_check_internal(struct rtattr **tb, u32 *type,
260 struct crypto_attr_type *algt;
262 algt = crypto_get_attr_type(tb);
265 if ((algt->type & CRYPTO_ALG_INTERNAL))
266 *type |= CRYPTO_ALG_INTERNAL;
267 if ((algt->mask & CRYPTO_ALG_INTERNAL))
268 *mask |= CRYPTO_ALG_INTERNAL;
271 static int mcryptd_hash_init_tfm(struct crypto_tfm *tfm)
273 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
274 struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
275 struct crypto_ahash_spawn *spawn = &ictx->spawn;
276 struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
277 struct crypto_ahash *hash;
279 hash = crypto_spawn_ahash(spawn);
281 return PTR_ERR(hash);
284 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
285 sizeof(struct mcryptd_hash_request_ctx) +
286 crypto_ahash_reqsize(hash));
290 static void mcryptd_hash_exit_tfm(struct crypto_tfm *tfm)
292 struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
294 crypto_free_ahash(ctx->child);
297 static int mcryptd_hash_setkey(struct crypto_ahash *parent,
298 const u8 *key, unsigned int keylen)
300 struct mcryptd_hash_ctx *ctx = crypto_ahash_ctx(parent);
301 struct crypto_ahash *child = ctx->child;
304 crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
305 crypto_ahash_set_flags(child, crypto_ahash_get_flags(parent) &
306 CRYPTO_TFM_REQ_MASK);
307 err = crypto_ahash_setkey(child, key, keylen);
308 crypto_ahash_set_flags(parent, crypto_ahash_get_flags(child) &
309 CRYPTO_TFM_RES_MASK);
313 static int mcryptd_hash_enqueue(struct ahash_request *req,
314 crypto_completion_t complete)
318 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
319 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
320 struct mcryptd_queue *queue =
321 mcryptd_get_queue(crypto_ahash_tfm(tfm));
323 rctx->complete = req->base.complete;
324 req->base.complete = complete;
326 ret = mcryptd_enqueue_request(queue, &req->base, rctx);
331 static void mcryptd_hash_init(struct crypto_async_request *req_async, int err)
333 struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
334 struct crypto_ahash *child = ctx->child;
335 struct ahash_request *req = ahash_request_cast(req_async);
336 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
337 struct ahash_request *desc = &rctx->areq;
339 if (unlikely(err == -EINPROGRESS))
342 ahash_request_set_tfm(desc, child);
343 ahash_request_set_callback(desc, CRYPTO_TFM_REQ_MAY_SLEEP,
344 rctx->complete, req_async);
346 rctx->out = req->result;
347 err = crypto_ahash_init(desc);
351 rctx->complete(&req->base, err);
355 static int mcryptd_hash_init_enqueue(struct ahash_request *req)
357 return mcryptd_hash_enqueue(req, mcryptd_hash_init);
360 static void mcryptd_hash_update(struct crypto_async_request *req_async, int err)
362 struct ahash_request *req = ahash_request_cast(req_async);
363 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
365 if (unlikely(err == -EINPROGRESS))
368 rctx->out = req->result;
369 err = ahash_mcryptd_update(&rctx->areq);
371 req->base.complete = rctx->complete;
378 rctx->complete(&req->base, err);
382 static int mcryptd_hash_update_enqueue(struct ahash_request *req)
384 return mcryptd_hash_enqueue(req, mcryptd_hash_update);
387 static void mcryptd_hash_final(struct crypto_async_request *req_async, int err)
389 struct ahash_request *req = ahash_request_cast(req_async);
390 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
392 if (unlikely(err == -EINPROGRESS))
395 rctx->out = req->result;
396 err = ahash_mcryptd_final(&rctx->areq);
398 req->base.complete = rctx->complete;
405 rctx->complete(&req->base, err);
409 static int mcryptd_hash_final_enqueue(struct ahash_request *req)
411 return mcryptd_hash_enqueue(req, mcryptd_hash_final);
414 static void mcryptd_hash_finup(struct crypto_async_request *req_async, int err)
416 struct ahash_request *req = ahash_request_cast(req_async);
417 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
419 if (unlikely(err == -EINPROGRESS))
421 rctx->out = req->result;
422 err = ahash_mcryptd_finup(&rctx->areq);
425 req->base.complete = rctx->complete;
432 rctx->complete(&req->base, err);
436 static int mcryptd_hash_finup_enqueue(struct ahash_request *req)
438 return mcryptd_hash_enqueue(req, mcryptd_hash_finup);
441 static void mcryptd_hash_digest(struct crypto_async_request *req_async, int err)
443 struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
444 struct crypto_ahash *child = ctx->child;
445 struct ahash_request *req = ahash_request_cast(req_async);
446 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
447 struct ahash_request *desc = &rctx->areq;
449 if (unlikely(err == -EINPROGRESS))
452 ahash_request_set_tfm(desc, child);
453 ahash_request_set_callback(desc, CRYPTO_TFM_REQ_MAY_SLEEP,
454 rctx->complete, req_async);
456 rctx->out = req->result;
457 err = ahash_mcryptd_digest(desc);
461 rctx->complete(&req->base, err);
465 static int mcryptd_hash_digest_enqueue(struct ahash_request *req)
467 return mcryptd_hash_enqueue(req, mcryptd_hash_digest);
470 static int mcryptd_hash_export(struct ahash_request *req, void *out)
472 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
474 return crypto_ahash_export(&rctx->areq, out);
477 static int mcryptd_hash_import(struct ahash_request *req, const void *in)
479 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
481 return crypto_ahash_import(&rctx->areq, in);
484 static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
485 struct mcryptd_queue *queue)
487 struct hashd_instance_ctx *ctx;
488 struct ahash_instance *inst;
489 struct hash_alg_common *halg;
490 struct crypto_alg *alg;
495 mcryptd_check_internal(tb, &type, &mask);
497 halg = ahash_attr_alg(tb[1], type, mask);
499 return PTR_ERR(halg);
502 pr_debug("crypto: mcryptd hash alg: %s\n", alg->cra_name);
503 inst = mcryptd_alloc_instance(alg, ahash_instance_headroom(),
509 ctx = ahash_instance_ctx(inst);
512 err = crypto_init_ahash_spawn(&ctx->spawn, halg,
513 ahash_crypto_instance(inst));
517 type = CRYPTO_ALG_ASYNC;
518 if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
519 type |= CRYPTO_ALG_INTERNAL;
520 inst->alg.halg.base.cra_flags = type;
522 inst->alg.halg.digestsize = halg->digestsize;
523 inst->alg.halg.statesize = halg->statesize;
524 inst->alg.halg.base.cra_ctxsize = sizeof(struct mcryptd_hash_ctx);
526 inst->alg.halg.base.cra_init = mcryptd_hash_init_tfm;
527 inst->alg.halg.base.cra_exit = mcryptd_hash_exit_tfm;
529 inst->alg.init = mcryptd_hash_init_enqueue;
530 inst->alg.update = mcryptd_hash_update_enqueue;
531 inst->alg.final = mcryptd_hash_final_enqueue;
532 inst->alg.finup = mcryptd_hash_finup_enqueue;
533 inst->alg.export = mcryptd_hash_export;
534 inst->alg.import = mcryptd_hash_import;
535 inst->alg.setkey = mcryptd_hash_setkey;
536 inst->alg.digest = mcryptd_hash_digest_enqueue;
538 err = ahash_register_instance(tmpl, inst);
540 crypto_drop_ahash(&ctx->spawn);
550 static struct mcryptd_queue mqueue;
552 static int mcryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
554 struct crypto_attr_type *algt;
556 algt = crypto_get_attr_type(tb);
558 return PTR_ERR(algt);
560 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
561 case CRYPTO_ALG_TYPE_DIGEST:
562 return mcryptd_create_hash(tmpl, tb, &mqueue);
569 static void mcryptd_free(struct crypto_instance *inst)
571 struct mcryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
572 struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
574 switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
575 case CRYPTO_ALG_TYPE_AHASH:
576 crypto_drop_ahash(&hctx->spawn);
577 kfree(ahash_instance(inst));
580 crypto_drop_spawn(&ctx->spawn);
585 static struct crypto_template mcryptd_tmpl = {
587 .create = mcryptd_create,
588 .free = mcryptd_free,
589 .module = THIS_MODULE,
592 struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
595 char mcryptd_alg_name[CRYPTO_MAX_ALG_NAME];
596 struct crypto_ahash *tfm;
598 if (snprintf(mcryptd_alg_name, CRYPTO_MAX_ALG_NAME,
599 "mcryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
600 return ERR_PTR(-EINVAL);
601 tfm = crypto_alloc_ahash(mcryptd_alg_name, type, mask);
603 return ERR_CAST(tfm);
604 if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
605 crypto_free_ahash(tfm);
606 return ERR_PTR(-EINVAL);
609 return __mcryptd_ahash_cast(tfm);
611 EXPORT_SYMBOL_GPL(mcryptd_alloc_ahash);
613 int ahash_mcryptd_digest(struct ahash_request *desc)
615 return crypto_ahash_init(desc) ?: ahash_mcryptd_finup(desc);
618 int ahash_mcryptd_update(struct ahash_request *desc)
620 /* alignment is to be done by multi-buffer crypto algorithm if needed */
622 return crypto_ahash_update(desc);
625 int ahash_mcryptd_finup(struct ahash_request *desc)
627 /* alignment is to be done by multi-buffer crypto algorithm if needed */
629 return crypto_ahash_finup(desc);
632 int ahash_mcryptd_final(struct ahash_request *desc)
634 /* alignment is to be done by multi-buffer crypto algorithm if needed */
636 return crypto_ahash_final(desc);
639 struct crypto_ahash *mcryptd_ahash_child(struct mcryptd_ahash *tfm)
641 struct mcryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
645 EXPORT_SYMBOL_GPL(mcryptd_ahash_child);
647 struct ahash_request *mcryptd_ahash_desc(struct ahash_request *req)
649 struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
652 EXPORT_SYMBOL_GPL(mcryptd_ahash_desc);
654 void mcryptd_free_ahash(struct mcryptd_ahash *tfm)
656 crypto_free_ahash(&tfm->base);
658 EXPORT_SYMBOL_GPL(mcryptd_free_ahash);
660 static int __init mcryptd_init(void)
663 struct mcryptd_flush_list *flist;
665 mcryptd_flist = alloc_percpu(struct mcryptd_flush_list);
666 for_each_possible_cpu(cpu) {
667 flist = per_cpu_ptr(mcryptd_flist, cpu);
668 INIT_LIST_HEAD(&flist->list);
669 mutex_init(&flist->lock);
672 err = mcryptd_init_queue(&mqueue, MCRYPTD_MAX_CPU_QLEN);
674 free_percpu(mcryptd_flist);
678 err = crypto_register_template(&mcryptd_tmpl);
680 mcryptd_fini_queue(&mqueue);
681 free_percpu(mcryptd_flist);
687 static void __exit mcryptd_exit(void)
689 mcryptd_fini_queue(&mqueue);
690 crypto_unregister_template(&mcryptd_tmpl);
691 free_percpu(mcryptd_flist);
694 subsys_initcall(mcryptd_init);
695 module_exit(mcryptd_exit);
697 MODULE_LICENSE("GPL");
698 MODULE_DESCRIPTION("Software async multibuffer crypto daemon");
699 MODULE_ALIAS_CRYPTO("mcryptd");