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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ALSA sequencer Timing queue handling
4 * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
5 *
6 * MAJOR CHANGES
7 * Nov. 13, 1999 Takashi Iwai <iwai@ww.uni-erlangen.de>
8 * - Queues are allocated dynamically via ioctl.
9 * - When owner client is deleted, all owned queues are deleted, too.
10 * - Owner of unlocked queue is kept unmodified even if it is
11 * manipulated by other clients.
12 * - Owner field in SET_QUEUE_OWNER ioctl must be identical with the
13 * caller client. i.e. Changing owner to a third client is not
14 * allowed.
15 *
16 * Aug. 30, 2000 Takashi Iwai
17 * - Queues are managed in static array again, but with better way.
18 * The API itself is identical.
19 * - The queue is locked when struct snd_seq_queue pointer is returned via
20 * queueptr(). This pointer *MUST* be released afterward by
21 * queuefree(ptr).
22 * - Addition of experimental sync support.
23 */
24
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <sound/core.h>
28
29#include "seq_memory.h"
30#include "seq_queue.h"
31#include "seq_clientmgr.h"
32#include "seq_fifo.h"
33#include "seq_timer.h"
34#include "seq_info.h"
35
36/* list of allocated queues */
37static struct snd_seq_queue *queue_list[SNDRV_SEQ_MAX_QUEUES];
38static DEFINE_SPINLOCK(queue_list_lock);
39/* number of queues allocated */
40static int num_queues;
41
42int snd_seq_queue_get_cur_queues(void)
43{
44 return num_queues;
45}
46
47/*----------------------------------------------------------------*/
48
49/* assign queue id and insert to list */
50static int queue_list_add(struct snd_seq_queue *q)
51{
52 int i;
53 unsigned long flags;
54
55 spin_lock_irqsave(&queue_list_lock, flags);
56 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
57 if (! queue_list[i]) {
58 queue_list[i] = q;
59 q->queue = i;
60 num_queues++;
61 spin_unlock_irqrestore(&queue_list_lock, flags);
62 return i;
63 }
64 }
65 spin_unlock_irqrestore(&queue_list_lock, flags);
66 return -1;
67}
68
69static struct snd_seq_queue *queue_list_remove(int id, int client)
70{
71 struct snd_seq_queue *q;
72 unsigned long flags;
73
74 spin_lock_irqsave(&queue_list_lock, flags);
75 q = queue_list[id];
76 if (q) {
77 spin_lock(&q->owner_lock);
78 if (q->owner == client) {
79 /* found */
80 q->klocked = 1;
81 spin_unlock(&q->owner_lock);
82 queue_list[id] = NULL;
83 num_queues--;
84 spin_unlock_irqrestore(&queue_list_lock, flags);
85 return q;
86 }
87 spin_unlock(&q->owner_lock);
88 }
89 spin_unlock_irqrestore(&queue_list_lock, flags);
90 return NULL;
91}
92
93/*----------------------------------------------------------------*/
94
95/* create new queue (constructor) */
96static struct snd_seq_queue *queue_new(int owner, int locked)
97{
98 struct snd_seq_queue *q;
99
100 q = kzalloc(sizeof(*q), GFP_KERNEL);
101 if (!q)
102 return NULL;
103
104 spin_lock_init(&q->owner_lock);
105 spin_lock_init(&q->check_lock);
106 mutex_init(&q->timer_mutex);
107 snd_use_lock_init(&q->use_lock);
108 q->queue = -1;
109
110 q->tickq = snd_seq_prioq_new();
111 q->timeq = snd_seq_prioq_new();
112 q->timer = snd_seq_timer_new();
113 if (q->tickq == NULL || q->timeq == NULL || q->timer == NULL) {
114 snd_seq_prioq_delete(&q->tickq);
115 snd_seq_prioq_delete(&q->timeq);
116 snd_seq_timer_delete(&q->timer);
117 kfree(q);
118 return NULL;
119 }
120
121 q->owner = owner;
122 q->locked = locked;
123 q->klocked = 0;
124
125 return q;
126}
127
128/* delete queue (destructor) */
129static void queue_delete(struct snd_seq_queue *q)
130{
131 /* stop and release the timer */
132 mutex_lock(&q->timer_mutex);
133 snd_seq_timer_stop(q->timer);
134 snd_seq_timer_close(q);
135 mutex_unlock(&q->timer_mutex);
136 /* wait until access free */
137 snd_use_lock_sync(&q->use_lock);
138 /* release resources... */
139 snd_seq_prioq_delete(&q->tickq);
140 snd_seq_prioq_delete(&q->timeq);
141 snd_seq_timer_delete(&q->timer);
142
143 kfree(q);
144}
145
146
147/*----------------------------------------------------------------*/
148
149/* delete all existing queues */
150void snd_seq_queues_delete(void)
151{
152 int i;
153
154 /* clear list */
155 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
156 if (queue_list[i])
157 queue_delete(queue_list[i]);
158 }
159}
160
161static void queue_use(struct snd_seq_queue *queue, int client, int use);
162
163/* allocate a new queue -
164 * return pointer to new queue or ERR_PTR(-errno) for error
165 * The new queue's use_lock is set to 1. It is the caller's responsibility to
166 * call snd_use_lock_free(&q->use_lock).
167 */
168struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int info_flags)
169{
170 struct snd_seq_queue *q;
171
172 q = queue_new(client, locked);
173 if (q == NULL)
174 return ERR_PTR(-ENOMEM);
175 q->info_flags = info_flags;
176 queue_use(q, client, 1);
177 snd_use_lock_use(&q->use_lock);
178 if (queue_list_add(q) < 0) {
179 snd_use_lock_free(&q->use_lock);
180 queue_delete(q);
181 return ERR_PTR(-ENOMEM);
182 }
183 return q;
184}
185
186/* delete a queue - queue must be owned by the client */
187int snd_seq_queue_delete(int client, int queueid)
188{
189 struct snd_seq_queue *q;
190
191 if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
192 return -EINVAL;
193 q = queue_list_remove(queueid, client);
194 if (q == NULL)
195 return -EINVAL;
196 queue_delete(q);
197
198 return 0;
199}
200
201
202/* return pointer to queue structure for specified id */
203struct snd_seq_queue *queueptr(int queueid)
204{
205 struct snd_seq_queue *q;
206 unsigned long flags;
207
208 if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
209 return NULL;
210 spin_lock_irqsave(&queue_list_lock, flags);
211 q = queue_list[queueid];
212 if (q)
213 snd_use_lock_use(&q->use_lock);
214 spin_unlock_irqrestore(&queue_list_lock, flags);
215 return q;
216}
217
218/* return the (first) queue matching with the specified name */
219struct snd_seq_queue *snd_seq_queue_find_name(char *name)
220{
221 int i;
222 struct snd_seq_queue *q;
223
224 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
225 if ((q = queueptr(i)) != NULL) {
226 if (strncmp(q->name, name, sizeof(q->name)) == 0)
227 return q;
228 queuefree(q);
229 }
230 }
231 return NULL;
232}
233
234
235/* -------------------------------------------------------- */
236
237void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop)
238{
239 unsigned long flags;
240 struct snd_seq_event_cell *cell;
241 snd_seq_tick_time_t cur_tick;
242 snd_seq_real_time_t cur_time;
243
244 if (q == NULL)
245 return;
246
247 /* make this function non-reentrant */
248 spin_lock_irqsave(&q->check_lock, flags);
249 if (q->check_blocked) {
250 q->check_again = 1;
251 spin_unlock_irqrestore(&q->check_lock, flags);
252 return; /* other thread is already checking queues */
253 }
254 q->check_blocked = 1;
255 spin_unlock_irqrestore(&q->check_lock, flags);
256
257 __again:
258 /* Process tick queue... */
259 cur_tick = snd_seq_timer_get_cur_tick(q->timer);
260 for (;;) {
261 cell = snd_seq_prioq_cell_out(q->tickq, &cur_tick);
262 if (!cell)
263 break;
264 snd_seq_dispatch_event(cell, atomic, hop);
265 }
266
267 /* Process time queue... */
268 cur_time = snd_seq_timer_get_cur_time(q->timer, false);
269 for (;;) {
270 cell = snd_seq_prioq_cell_out(q->timeq, &cur_time);
271 if (!cell)
272 break;
273 snd_seq_dispatch_event(cell, atomic, hop);
274 }
275
276 /* free lock */
277 spin_lock_irqsave(&q->check_lock, flags);
278 if (q->check_again) {
279 q->check_again = 0;
280 spin_unlock_irqrestore(&q->check_lock, flags);
281 goto __again;
282 }
283 q->check_blocked = 0;
284 spin_unlock_irqrestore(&q->check_lock, flags);
285}
286
287
288/* enqueue a event to singe queue */
289int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop)
290{
291 int dest, err;
292 struct snd_seq_queue *q;
293
294 if (snd_BUG_ON(!cell))
295 return -EINVAL;
296 dest = cell->event.queue; /* destination queue */
297 q = queueptr(dest);
298 if (q == NULL)
299 return -EINVAL;
300 /* handle relative time stamps, convert them into absolute */
301 if ((cell->event.flags & SNDRV_SEQ_TIME_MODE_MASK) == SNDRV_SEQ_TIME_MODE_REL) {
302 switch (cell->event.flags & SNDRV_SEQ_TIME_STAMP_MASK) {
303 case SNDRV_SEQ_TIME_STAMP_TICK:
304 cell->event.time.tick += q->timer->tick.cur_tick;
305 break;
306
307 case SNDRV_SEQ_TIME_STAMP_REAL:
308 snd_seq_inc_real_time(&cell->event.time.time,
309 &q->timer->cur_time);
310 break;
311 }
312 cell->event.flags &= ~SNDRV_SEQ_TIME_MODE_MASK;
313 cell->event.flags |= SNDRV_SEQ_TIME_MODE_ABS;
314 }
315 /* enqueue event in the real-time or midi queue */
316 switch (cell->event.flags & SNDRV_SEQ_TIME_STAMP_MASK) {
317 case SNDRV_SEQ_TIME_STAMP_TICK:
318 err = snd_seq_prioq_cell_in(q->tickq, cell);
319 break;
320
321 case SNDRV_SEQ_TIME_STAMP_REAL:
322 default:
323 err = snd_seq_prioq_cell_in(q->timeq, cell);
324 break;
325 }
326
327 if (err < 0) {
328 queuefree(q); /* unlock */
329 return err;
330 }
331
332 /* trigger dispatching */
333 snd_seq_check_queue(q, atomic, hop);
334
335 queuefree(q); /* unlock */
336
337 return 0;
338}
339
340
341/*----------------------------------------------------------------*/
342
343static inline int check_access(struct snd_seq_queue *q, int client)
344{
345 return (q->owner == client) || (!q->locked && !q->klocked);
346}
347
348/* check if the client has permission to modify queue parameters.
349 * if it does, lock the queue
350 */
351static int queue_access_lock(struct snd_seq_queue *q, int client)
352{
353 unsigned long flags;
354 int access_ok;
355
356 spin_lock_irqsave(&q->owner_lock, flags);
357 access_ok = check_access(q, client);
358 if (access_ok)
359 q->klocked = 1;
360 spin_unlock_irqrestore(&q->owner_lock, flags);
361 return access_ok;
362}
363
364/* unlock the queue */
365static inline void queue_access_unlock(struct snd_seq_queue *q)
366{
367 unsigned long flags;
368
369 spin_lock_irqsave(&q->owner_lock, flags);
370 q->klocked = 0;
371 spin_unlock_irqrestore(&q->owner_lock, flags);
372}
373
374/* exported - only checking permission */
375int snd_seq_queue_check_access(int queueid, int client)
376{
377 struct snd_seq_queue *q = queueptr(queueid);
378 int access_ok;
379 unsigned long flags;
380
381 if (! q)
382 return 0;
383 spin_lock_irqsave(&q->owner_lock, flags);
384 access_ok = check_access(q, client);
385 spin_unlock_irqrestore(&q->owner_lock, flags);
386 queuefree(q);
387 return access_ok;
388}
389
390/*----------------------------------------------------------------*/
391
392/*
393 * change queue's owner and permission
394 */
395int snd_seq_queue_set_owner(int queueid, int client, int locked)
396{
397 struct snd_seq_queue *q = queueptr(queueid);
398 unsigned long flags;
399
400 if (q == NULL)
401 return -EINVAL;
402
403 if (! queue_access_lock(q, client)) {
404 queuefree(q);
405 return -EPERM;
406 }
407
408 spin_lock_irqsave(&q->owner_lock, flags);
409 q->locked = locked ? 1 : 0;
410 q->owner = client;
411 spin_unlock_irqrestore(&q->owner_lock, flags);
412 queue_access_unlock(q);
413 queuefree(q);
414
415 return 0;
416}
417
418
419/*----------------------------------------------------------------*/
420
421/* open timer -
422 * q->use mutex should be down before calling this function to avoid
423 * confliction with snd_seq_queue_use()
424 */
425int snd_seq_queue_timer_open(int queueid)
426{
427 int result = 0;
428 struct snd_seq_queue *queue;
429 struct snd_seq_timer *tmr;
430
431 queue = queueptr(queueid);
432 if (queue == NULL)
433 return -EINVAL;
434 tmr = queue->timer;
435 if ((result = snd_seq_timer_open(queue)) < 0) {
436 snd_seq_timer_defaults(tmr);
437 result = snd_seq_timer_open(queue);
438 }
439 queuefree(queue);
440 return result;
441}
442
443/* close timer -
444 * q->use mutex should be down before calling this function
445 */
446int snd_seq_queue_timer_close(int queueid)
447{
448 struct snd_seq_queue *queue;
449 int result = 0;
450
451 queue = queueptr(queueid);
452 if (queue == NULL)
453 return -EINVAL;
454 snd_seq_timer_close(queue);
455 queuefree(queue);
456 return result;
457}
458
459/* change queue tempo and ppq */
460int snd_seq_queue_timer_set_tempo(int queueid, int client,
461 struct snd_seq_queue_tempo *info)
462{
463 struct snd_seq_queue *q = queueptr(queueid);
464 int result;
465
466 if (q == NULL)
467 return -EINVAL;
468 if (! queue_access_lock(q, client)) {
469 queuefree(q);
470 return -EPERM;
471 }
472
473 result = snd_seq_timer_set_tempo_ppq(q->timer, info->tempo, info->ppq);
474 if (result >= 0 && info->skew_base > 0)
475 result = snd_seq_timer_set_skew(q->timer, info->skew_value,
476 info->skew_base);
477 queue_access_unlock(q);
478 queuefree(q);
479 return result;
480}
481
482/* use or unuse this queue */
483static void queue_use(struct snd_seq_queue *queue, int client, int use)
484{
485 if (use) {
486 if (!test_and_set_bit(client, queue->clients_bitmap))
487 queue->clients++;
488 } else {
489 if (test_and_clear_bit(client, queue->clients_bitmap))
490 queue->clients--;
491 }
492 if (queue->clients) {
493 if (use && queue->clients == 1)
494 snd_seq_timer_defaults(queue->timer);
495 snd_seq_timer_open(queue);
496 } else {
497 snd_seq_timer_close(queue);
498 }
499}
500
501/* use or unuse this queue -
502 * if it is the first client, starts the timer.
503 * if it is not longer used by any clients, stop the timer.
504 */
505int snd_seq_queue_use(int queueid, int client, int use)
506{
507 struct snd_seq_queue *queue;
508
509 queue = queueptr(queueid);
510 if (queue == NULL)
511 return -EINVAL;
512 mutex_lock(&queue->timer_mutex);
513 queue_use(queue, client, use);
514 mutex_unlock(&queue->timer_mutex);
515 queuefree(queue);
516 return 0;
517}
518
519/*
520 * check if queue is used by the client
521 * return negative value if the queue is invalid.
522 * return 0 if not used, 1 if used.
523 */
524int snd_seq_queue_is_used(int queueid, int client)
525{
526 struct snd_seq_queue *q;
527 int result;
528
529 q = queueptr(queueid);
530 if (q == NULL)
531 return -EINVAL; /* invalid queue */
532 result = test_bit(client, q->clients_bitmap) ? 1 : 0;
533 queuefree(q);
534 return result;
535}
536
537
538/*----------------------------------------------------------------*/
539
540/* notification that client has left the system -
541 * stop the timer on all queues owned by this client
542 */
543void snd_seq_queue_client_termination(int client)
544{
545 unsigned long flags;
546 int i;
547 struct snd_seq_queue *q;
548 bool matched;
549
550 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
551 if ((q = queueptr(i)) == NULL)
552 continue;
553 spin_lock_irqsave(&q->owner_lock, flags);
554 matched = (q->owner == client);
555 if (matched)
556 q->klocked = 1;
557 spin_unlock_irqrestore(&q->owner_lock, flags);
558 if (matched) {
559 if (q->timer->running)
560 snd_seq_timer_stop(q->timer);
561 snd_seq_timer_reset(q->timer);
562 }
563 queuefree(q);
564 }
565}
566
567/* final stage notification -
568 * remove cells for no longer exist client (for non-owned queue)
569 * or delete this queue (for owned queue)
570 */
571void snd_seq_queue_client_leave(int client)
572{
573 int i;
574 struct snd_seq_queue *q;
575
576 /* delete own queues from queue list */
577 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
578 if ((q = queue_list_remove(i, client)) != NULL)
579 queue_delete(q);
580 }
581
582 /* remove cells from existing queues -
583 * they are not owned by this client
584 */
585 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
586 if ((q = queueptr(i)) == NULL)
587 continue;
588 if (test_bit(client, q->clients_bitmap)) {
589 snd_seq_prioq_leave(q->tickq, client, 0);
590 snd_seq_prioq_leave(q->timeq, client, 0);
591 snd_seq_queue_use(q->queue, client, 0);
592 }
593 queuefree(q);
594 }
595}
596
597
598
599/*----------------------------------------------------------------*/
600
601/* remove cells from all queues */
602void snd_seq_queue_client_leave_cells(int client)
603{
604 int i;
605 struct snd_seq_queue *q;
606
607 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
608 if ((q = queueptr(i)) == NULL)
609 continue;
610 snd_seq_prioq_leave(q->tickq, client, 0);
611 snd_seq_prioq_leave(q->timeq, client, 0);
612 queuefree(q);
613 }
614}
615
616/* remove cells based on flush criteria */
617void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info)
618{
619 int i;
620 struct snd_seq_queue *q;
621
622 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
623 if ((q = queueptr(i)) == NULL)
624 continue;
625 if (test_bit(client, q->clients_bitmap) &&
626 (! (info->remove_mode & SNDRV_SEQ_REMOVE_DEST) ||
627 q->queue == info->queue)) {
628 snd_seq_prioq_remove_events(q->tickq, client, info);
629 snd_seq_prioq_remove_events(q->timeq, client, info);
630 }
631 queuefree(q);
632 }
633}
634
635/*----------------------------------------------------------------*/
636
637/*
638 * send events to all subscribed ports
639 */
640static void queue_broadcast_event(struct snd_seq_queue *q, struct snd_seq_event *ev,
641 int atomic, int hop)
642{
643 struct snd_seq_event sev;
644
645 sev = *ev;
646
647 sev.flags = SNDRV_SEQ_TIME_STAMP_TICK|SNDRV_SEQ_TIME_MODE_ABS;
648 sev.time.tick = q->timer->tick.cur_tick;
649 sev.queue = q->queue;
650 sev.data.queue.queue = q->queue;
651
652 /* broadcast events from Timer port */
653 sev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
654 sev.source.port = SNDRV_SEQ_PORT_SYSTEM_TIMER;
655 sev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
656 snd_seq_kernel_client_dispatch(SNDRV_SEQ_CLIENT_SYSTEM, &sev, atomic, hop);
657}
658
659/*
660 * process a received queue-control event.
661 * this function is exported for seq_sync.c.
662 */
663static void snd_seq_queue_process_event(struct snd_seq_queue *q,
664 struct snd_seq_event *ev,
665 int atomic, int hop)
666{
667 switch (ev->type) {
668 case SNDRV_SEQ_EVENT_START:
669 snd_seq_prioq_leave(q->tickq, ev->source.client, 1);
670 snd_seq_prioq_leave(q->timeq, ev->source.client, 1);
671 if (! snd_seq_timer_start(q->timer))
672 queue_broadcast_event(q, ev, atomic, hop);
673 break;
674
675 case SNDRV_SEQ_EVENT_CONTINUE:
676 if (! snd_seq_timer_continue(q->timer))
677 queue_broadcast_event(q, ev, atomic, hop);
678 break;
679
680 case SNDRV_SEQ_EVENT_STOP:
681 snd_seq_timer_stop(q->timer);
682 queue_broadcast_event(q, ev, atomic, hop);
683 break;
684
685 case SNDRV_SEQ_EVENT_TEMPO:
686 snd_seq_timer_set_tempo(q->timer, ev->data.queue.param.value);
687 queue_broadcast_event(q, ev, atomic, hop);
688 break;
689
690 case SNDRV_SEQ_EVENT_SETPOS_TICK:
691 if (snd_seq_timer_set_position_tick(q->timer, ev->data.queue.param.time.tick) == 0) {
692 queue_broadcast_event(q, ev, atomic, hop);
693 }
694 break;
695
696 case SNDRV_SEQ_EVENT_SETPOS_TIME:
697 if (snd_seq_timer_set_position_time(q->timer, ev->data.queue.param.time.time) == 0) {
698 queue_broadcast_event(q, ev, atomic, hop);
699 }
700 break;
701 case SNDRV_SEQ_EVENT_QUEUE_SKEW:
702 if (snd_seq_timer_set_skew(q->timer,
703 ev->data.queue.param.skew.value,
704 ev->data.queue.param.skew.base) == 0) {
705 queue_broadcast_event(q, ev, atomic, hop);
706 }
707 break;
708 }
709}
710
711
712/*
713 * Queue control via timer control port:
714 * this function is exported as a callback of timer port.
715 */
716int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop)
717{
718 struct snd_seq_queue *q;
719
720 if (snd_BUG_ON(!ev))
721 return -EINVAL;
722 q = queueptr(ev->data.queue.queue);
723
724 if (q == NULL)
725 return -EINVAL;
726
727 if (! queue_access_lock(q, ev->source.client)) {
728 queuefree(q);
729 return -EPERM;
730 }
731
732 snd_seq_queue_process_event(q, ev, atomic, hop);
733
734 queue_access_unlock(q);
735 queuefree(q);
736 return 0;
737}
738
739
740/*----------------------------------------------------------------*/
741
742#ifdef CONFIG_SND_PROC_FS
743/* exported to seq_info.c */
744void snd_seq_info_queues_read(struct snd_info_entry *entry,
745 struct snd_info_buffer *buffer)
746{
747 int i, bpm;
748 struct snd_seq_queue *q;
749 struct snd_seq_timer *tmr;
750 bool locked;
751 int owner;
752
753 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
754 if ((q = queueptr(i)) == NULL)
755 continue;
756
757 tmr = q->timer;
758 if (tmr->tempo)
759 bpm = 60000000 / tmr->tempo;
760 else
761 bpm = 0;
762
763 spin_lock_irq(&q->owner_lock);
764 locked = q->locked;
765 owner = q->owner;
766 spin_unlock_irq(&q->owner_lock);
767
768 snd_iprintf(buffer, "queue %d: [%s]\n", q->queue, q->name);
769 snd_iprintf(buffer, "owned by client : %d\n", owner);
770 snd_iprintf(buffer, "lock status : %s\n", locked ? "Locked" : "Free");
771 snd_iprintf(buffer, "queued time events : %d\n", snd_seq_prioq_avail(q->timeq));
772 snd_iprintf(buffer, "queued tick events : %d\n", snd_seq_prioq_avail(q->tickq));
773 snd_iprintf(buffer, "timer state : %s\n", tmr->running ? "Running" : "Stopped");
774 snd_iprintf(buffer, "timer PPQ : %d\n", tmr->ppq);
775 snd_iprintf(buffer, "current tempo : %d\n", tmr->tempo);
776 snd_iprintf(buffer, "current BPM : %d\n", bpm);
777 snd_iprintf(buffer, "current time : %d.%09d s\n", tmr->cur_time.tv_sec, tmr->cur_time.tv_nsec);
778 snd_iprintf(buffer, "current tick : %d\n", tmr->tick.cur_tick);
779 snd_iprintf(buffer, "\n");
780 queuefree(q);
781 }
782}
783#endif /* CONFIG_SND_PROC_FS */
784
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ALSA sequencer Timing queue handling
4 * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
5 *
6 * MAJOR CHANGES
7 * Nov. 13, 1999 Takashi Iwai <iwai@ww.uni-erlangen.de>
8 * - Queues are allocated dynamically via ioctl.
9 * - When owner client is deleted, all owned queues are deleted, too.
10 * - Owner of unlocked queue is kept unmodified even if it is
11 * manipulated by other clients.
12 * - Owner field in SET_QUEUE_OWNER ioctl must be identical with the
13 * caller client. i.e. Changing owner to a third client is not
14 * allowed.
15 *
16 * Aug. 30, 2000 Takashi Iwai
17 * - Queues are managed in static array again, but with better way.
18 * The API itself is identical.
19 * - The queue is locked when struct snd_seq_queue pointer is returned via
20 * queueptr(). This pointer *MUST* be released afterward by
21 * queuefree(ptr).
22 * - Addition of experimental sync support.
23 */
24
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <sound/core.h>
28
29#include "seq_memory.h"
30#include "seq_queue.h"
31#include "seq_clientmgr.h"
32#include "seq_fifo.h"
33#include "seq_timer.h"
34#include "seq_info.h"
35
36/* list of allocated queues */
37static struct snd_seq_queue *queue_list[SNDRV_SEQ_MAX_QUEUES];
38static DEFINE_SPINLOCK(queue_list_lock);
39/* number of queues allocated */
40static int num_queues;
41
42int snd_seq_queue_get_cur_queues(void)
43{
44 return num_queues;
45}
46
47/*----------------------------------------------------------------*/
48
49/* assign queue id and insert to list */
50static int queue_list_add(struct snd_seq_queue *q)
51{
52 int i;
53
54 guard(spinlock_irqsave)(&queue_list_lock);
55 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
56 if (! queue_list[i]) {
57 queue_list[i] = q;
58 q->queue = i;
59 num_queues++;
60 return i;
61 }
62 }
63 return -1;
64}
65
66static struct snd_seq_queue *queue_list_remove(int id, int client)
67{
68 struct snd_seq_queue *q;
69
70 guard(spinlock_irqsave)(&queue_list_lock);
71 q = queue_list[id];
72 if (q) {
73 guard(spinlock)(&q->owner_lock);
74 if (q->owner == client) {
75 /* found */
76 q->klocked = 1;
77 queue_list[id] = NULL;
78 num_queues--;
79 return q;
80 }
81 }
82 return NULL;
83}
84
85/*----------------------------------------------------------------*/
86
87/* create new queue (constructor) */
88static struct snd_seq_queue *queue_new(int owner, int locked)
89{
90 struct snd_seq_queue *q;
91
92 q = kzalloc(sizeof(*q), GFP_KERNEL);
93 if (!q)
94 return NULL;
95
96 spin_lock_init(&q->owner_lock);
97 spin_lock_init(&q->check_lock);
98 mutex_init(&q->timer_mutex);
99 snd_use_lock_init(&q->use_lock);
100 q->queue = -1;
101
102 q->tickq = snd_seq_prioq_new();
103 q->timeq = snd_seq_prioq_new();
104 q->timer = snd_seq_timer_new();
105 if (q->tickq == NULL || q->timeq == NULL || q->timer == NULL) {
106 snd_seq_prioq_delete(&q->tickq);
107 snd_seq_prioq_delete(&q->timeq);
108 snd_seq_timer_delete(&q->timer);
109 kfree(q);
110 return NULL;
111 }
112
113 q->owner = owner;
114 q->locked = locked;
115 q->klocked = 0;
116
117 return q;
118}
119
120/* delete queue (destructor) */
121static void queue_delete(struct snd_seq_queue *q)
122{
123 /* stop and release the timer */
124 mutex_lock(&q->timer_mutex);
125 snd_seq_timer_stop(q->timer);
126 snd_seq_timer_close(q);
127 mutex_unlock(&q->timer_mutex);
128 /* wait until access free */
129 snd_use_lock_sync(&q->use_lock);
130 /* release resources... */
131 snd_seq_prioq_delete(&q->tickq);
132 snd_seq_prioq_delete(&q->timeq);
133 snd_seq_timer_delete(&q->timer);
134
135 kfree(q);
136}
137
138
139/*----------------------------------------------------------------*/
140
141/* delete all existing queues */
142void snd_seq_queues_delete(void)
143{
144 int i;
145
146 /* clear list */
147 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
148 if (queue_list[i])
149 queue_delete(queue_list[i]);
150 }
151}
152
153static void queue_use(struct snd_seq_queue *queue, int client, int use);
154
155/* allocate a new queue -
156 * return pointer to new queue or ERR_PTR(-errno) for error
157 * The new queue's use_lock is set to 1. It is the caller's responsibility to
158 * call snd_use_lock_free(&q->use_lock).
159 */
160struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int info_flags)
161{
162 struct snd_seq_queue *q;
163
164 q = queue_new(client, locked);
165 if (q == NULL)
166 return ERR_PTR(-ENOMEM);
167 q->info_flags = info_flags;
168 queue_use(q, client, 1);
169 snd_use_lock_use(&q->use_lock);
170 if (queue_list_add(q) < 0) {
171 snd_use_lock_free(&q->use_lock);
172 queue_delete(q);
173 return ERR_PTR(-ENOMEM);
174 }
175 return q;
176}
177
178/* delete a queue - queue must be owned by the client */
179int snd_seq_queue_delete(int client, int queueid)
180{
181 struct snd_seq_queue *q;
182
183 if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
184 return -EINVAL;
185 q = queue_list_remove(queueid, client);
186 if (q == NULL)
187 return -EINVAL;
188 queue_delete(q);
189
190 return 0;
191}
192
193
194/* return pointer to queue structure for specified id */
195struct snd_seq_queue *queueptr(int queueid)
196{
197 struct snd_seq_queue *q;
198
199 if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
200 return NULL;
201 guard(spinlock_irqsave)(&queue_list_lock);
202 q = queue_list[queueid];
203 if (q)
204 snd_use_lock_use(&q->use_lock);
205 return q;
206}
207
208/* return the (first) queue matching with the specified name */
209struct snd_seq_queue *snd_seq_queue_find_name(char *name)
210{
211 int i;
212 struct snd_seq_queue *q;
213
214 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
215 q = queueptr(i);
216 if (q) {
217 if (strncmp(q->name, name, sizeof(q->name)) == 0)
218 return q;
219 queuefree(q);
220 }
221 }
222 return NULL;
223}
224
225
226/* -------------------------------------------------------- */
227
228#define MAX_CELL_PROCESSES_IN_QUEUE 1000
229
230void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop)
231{
232 struct snd_seq_event_cell *cell;
233 snd_seq_tick_time_t cur_tick;
234 snd_seq_real_time_t cur_time;
235 int processed = 0;
236
237 if (q == NULL)
238 return;
239
240 /* make this function non-reentrant */
241 scoped_guard(spinlock_irqsave, &q->check_lock) {
242 if (q->check_blocked) {
243 q->check_again = 1;
244 return; /* other thread is already checking queues */
245 }
246 q->check_blocked = 1;
247 }
248
249 __again:
250 /* Process tick queue... */
251 cur_tick = snd_seq_timer_get_cur_tick(q->timer);
252 for (;;) {
253 cell = snd_seq_prioq_cell_out(q->tickq, &cur_tick);
254 if (!cell)
255 break;
256 snd_seq_dispatch_event(cell, atomic, hop);
257 if (++processed >= MAX_CELL_PROCESSES_IN_QUEUE)
258 goto out; /* the rest processed at the next batch */
259 }
260
261 /* Process time queue... */
262 cur_time = snd_seq_timer_get_cur_time(q->timer, false);
263 for (;;) {
264 cell = snd_seq_prioq_cell_out(q->timeq, &cur_time);
265 if (!cell)
266 break;
267 snd_seq_dispatch_event(cell, atomic, hop);
268 if (++processed >= MAX_CELL_PROCESSES_IN_QUEUE)
269 goto out; /* the rest processed at the next batch */
270 }
271
272 out:
273 /* free lock */
274 scoped_guard(spinlock_irqsave, &q->check_lock) {
275 if (q->check_again) {
276 q->check_again = 0;
277 if (processed < MAX_CELL_PROCESSES_IN_QUEUE)
278 goto __again;
279 }
280 q->check_blocked = 0;
281 }
282}
283
284
285/* enqueue a event to singe queue */
286int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop)
287{
288 int dest, err;
289 struct snd_seq_queue *q;
290
291 if (snd_BUG_ON(!cell))
292 return -EINVAL;
293 dest = cell->event.queue; /* destination queue */
294 q = queueptr(dest);
295 if (q == NULL)
296 return -EINVAL;
297 /* handle relative time stamps, convert them into absolute */
298 if ((cell->event.flags & SNDRV_SEQ_TIME_MODE_MASK) == SNDRV_SEQ_TIME_MODE_REL) {
299 switch (cell->event.flags & SNDRV_SEQ_TIME_STAMP_MASK) {
300 case SNDRV_SEQ_TIME_STAMP_TICK:
301 cell->event.time.tick += q->timer->tick.cur_tick;
302 break;
303
304 case SNDRV_SEQ_TIME_STAMP_REAL:
305 snd_seq_inc_real_time(&cell->event.time.time,
306 &q->timer->cur_time);
307 break;
308 }
309 cell->event.flags &= ~SNDRV_SEQ_TIME_MODE_MASK;
310 cell->event.flags |= SNDRV_SEQ_TIME_MODE_ABS;
311 }
312 /* enqueue event in the real-time or midi queue */
313 switch (cell->event.flags & SNDRV_SEQ_TIME_STAMP_MASK) {
314 case SNDRV_SEQ_TIME_STAMP_TICK:
315 err = snd_seq_prioq_cell_in(q->tickq, cell);
316 break;
317
318 case SNDRV_SEQ_TIME_STAMP_REAL:
319 default:
320 err = snd_seq_prioq_cell_in(q->timeq, cell);
321 break;
322 }
323
324 if (err < 0) {
325 queuefree(q); /* unlock */
326 return err;
327 }
328
329 /* trigger dispatching */
330 snd_seq_check_queue(q, atomic, hop);
331
332 queuefree(q); /* unlock */
333
334 return 0;
335}
336
337
338/*----------------------------------------------------------------*/
339
340static inline int check_access(struct snd_seq_queue *q, int client)
341{
342 return (q->owner == client) || (!q->locked && !q->klocked);
343}
344
345/* check if the client has permission to modify queue parameters.
346 * if it does, lock the queue
347 */
348static int queue_access_lock(struct snd_seq_queue *q, int client)
349{
350 int access_ok;
351
352 guard(spinlock_irqsave)(&q->owner_lock);
353 access_ok = check_access(q, client);
354 if (access_ok)
355 q->klocked = 1;
356 return access_ok;
357}
358
359/* unlock the queue */
360static inline void queue_access_unlock(struct snd_seq_queue *q)
361{
362 guard(spinlock_irqsave)(&q->owner_lock);
363 q->klocked = 0;
364}
365
366/* exported - only checking permission */
367int snd_seq_queue_check_access(int queueid, int client)
368{
369 struct snd_seq_queue *q = queueptr(queueid);
370 int access_ok;
371
372 if (! q)
373 return 0;
374 scoped_guard(spinlock_irqsave, &q->owner_lock)
375 access_ok = check_access(q, client);
376 queuefree(q);
377 return access_ok;
378}
379
380/*----------------------------------------------------------------*/
381
382/*
383 * change queue's owner and permission
384 */
385int snd_seq_queue_set_owner(int queueid, int client, int locked)
386{
387 struct snd_seq_queue *q = queueptr(queueid);
388
389 if (q == NULL)
390 return -EINVAL;
391
392 if (! queue_access_lock(q, client)) {
393 queuefree(q);
394 return -EPERM;
395 }
396
397 scoped_guard(spinlock_irqsave, &q->owner_lock) {
398 q->locked = locked ? 1 : 0;
399 q->owner = client;
400 }
401 queue_access_unlock(q);
402 queuefree(q);
403
404 return 0;
405}
406
407
408/*----------------------------------------------------------------*/
409
410/* open timer -
411 * q->use mutex should be down before calling this function to avoid
412 * confliction with snd_seq_queue_use()
413 */
414int snd_seq_queue_timer_open(int queueid)
415{
416 int result = 0;
417 struct snd_seq_queue *queue;
418 struct snd_seq_timer *tmr;
419
420 queue = queueptr(queueid);
421 if (queue == NULL)
422 return -EINVAL;
423 tmr = queue->timer;
424 result = snd_seq_timer_open(queue);
425 if (result < 0) {
426 snd_seq_timer_defaults(tmr);
427 result = snd_seq_timer_open(queue);
428 }
429 queuefree(queue);
430 return result;
431}
432
433/* close timer -
434 * q->use mutex should be down before calling this function
435 */
436int snd_seq_queue_timer_close(int queueid)
437{
438 struct snd_seq_queue *queue;
439 int result = 0;
440
441 queue = queueptr(queueid);
442 if (queue == NULL)
443 return -EINVAL;
444 snd_seq_timer_close(queue);
445 queuefree(queue);
446 return result;
447}
448
449/* change queue tempo and ppq */
450int snd_seq_queue_timer_set_tempo(int queueid, int client,
451 struct snd_seq_queue_tempo *info)
452{
453 struct snd_seq_queue *q = queueptr(queueid);
454 int result;
455
456 if (q == NULL)
457 return -EINVAL;
458 if (! queue_access_lock(q, client)) {
459 queuefree(q);
460 return -EPERM;
461 }
462
463 result = snd_seq_timer_set_tempo_ppq(q->timer, info->tempo, info->ppq,
464 info->tempo_base);
465 if (result >= 0 && info->skew_base > 0)
466 result = snd_seq_timer_set_skew(q->timer, info->skew_value,
467 info->skew_base);
468 queue_access_unlock(q);
469 queuefree(q);
470 return result;
471}
472
473/* use or unuse this queue */
474static void queue_use(struct snd_seq_queue *queue, int client, int use)
475{
476 if (use) {
477 if (!test_and_set_bit(client, queue->clients_bitmap))
478 queue->clients++;
479 } else {
480 if (test_and_clear_bit(client, queue->clients_bitmap))
481 queue->clients--;
482 }
483 if (queue->clients) {
484 if (use && queue->clients == 1)
485 snd_seq_timer_defaults(queue->timer);
486 snd_seq_timer_open(queue);
487 } else {
488 snd_seq_timer_close(queue);
489 }
490}
491
492/* use or unuse this queue -
493 * if it is the first client, starts the timer.
494 * if it is not longer used by any clients, stop the timer.
495 */
496int snd_seq_queue_use(int queueid, int client, int use)
497{
498 struct snd_seq_queue *queue;
499
500 queue = queueptr(queueid);
501 if (queue == NULL)
502 return -EINVAL;
503 mutex_lock(&queue->timer_mutex);
504 queue_use(queue, client, use);
505 mutex_unlock(&queue->timer_mutex);
506 queuefree(queue);
507 return 0;
508}
509
510/*
511 * check if queue is used by the client
512 * return negative value if the queue is invalid.
513 * return 0 if not used, 1 if used.
514 */
515int snd_seq_queue_is_used(int queueid, int client)
516{
517 struct snd_seq_queue *q;
518 int result;
519
520 q = queueptr(queueid);
521 if (q == NULL)
522 return -EINVAL; /* invalid queue */
523 result = test_bit(client, q->clients_bitmap) ? 1 : 0;
524 queuefree(q);
525 return result;
526}
527
528
529/*----------------------------------------------------------------*/
530
531/* final stage notification -
532 * remove cells for no longer exist client (for non-owned queue)
533 * or delete this queue (for owned queue)
534 */
535void snd_seq_queue_client_leave(int client)
536{
537 int i;
538 struct snd_seq_queue *q;
539
540 /* delete own queues from queue list */
541 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
542 q = queue_list_remove(i, client);
543 if (q)
544 queue_delete(q);
545 }
546
547 /* remove cells from existing queues -
548 * they are not owned by this client
549 */
550 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
551 q = queueptr(i);
552 if (!q)
553 continue;
554 if (test_bit(client, q->clients_bitmap)) {
555 snd_seq_prioq_leave(q->tickq, client, 0);
556 snd_seq_prioq_leave(q->timeq, client, 0);
557 snd_seq_queue_use(q->queue, client, 0);
558 }
559 queuefree(q);
560 }
561}
562
563
564
565/*----------------------------------------------------------------*/
566
567/* remove cells from all queues */
568void snd_seq_queue_client_leave_cells(int client)
569{
570 int i;
571 struct snd_seq_queue *q;
572
573 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
574 q = queueptr(i);
575 if (!q)
576 continue;
577 snd_seq_prioq_leave(q->tickq, client, 0);
578 snd_seq_prioq_leave(q->timeq, client, 0);
579 queuefree(q);
580 }
581}
582
583/* remove cells based on flush criteria */
584void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info)
585{
586 int i;
587 struct snd_seq_queue *q;
588
589 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
590 q = queueptr(i);
591 if (!q)
592 continue;
593 if (test_bit(client, q->clients_bitmap) &&
594 (! (info->remove_mode & SNDRV_SEQ_REMOVE_DEST) ||
595 q->queue == info->queue)) {
596 snd_seq_prioq_remove_events(q->tickq, client, info);
597 snd_seq_prioq_remove_events(q->timeq, client, info);
598 }
599 queuefree(q);
600 }
601}
602
603/*----------------------------------------------------------------*/
604
605/*
606 * send events to all subscribed ports
607 */
608static void queue_broadcast_event(struct snd_seq_queue *q, struct snd_seq_event *ev,
609 int atomic, int hop)
610{
611 struct snd_seq_event sev;
612
613 sev = *ev;
614
615 sev.flags = SNDRV_SEQ_TIME_STAMP_TICK|SNDRV_SEQ_TIME_MODE_ABS;
616 sev.time.tick = q->timer->tick.cur_tick;
617 sev.queue = q->queue;
618 sev.data.queue.queue = q->queue;
619
620 /* broadcast events from Timer port */
621 sev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
622 sev.source.port = SNDRV_SEQ_PORT_SYSTEM_TIMER;
623 sev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
624 snd_seq_kernel_client_dispatch(SNDRV_SEQ_CLIENT_SYSTEM, &sev, atomic, hop);
625}
626
627/*
628 * process a received queue-control event.
629 * this function is exported for seq_sync.c.
630 */
631static void snd_seq_queue_process_event(struct snd_seq_queue *q,
632 struct snd_seq_event *ev,
633 int atomic, int hop)
634{
635 switch (ev->type) {
636 case SNDRV_SEQ_EVENT_START:
637 snd_seq_prioq_leave(q->tickq, ev->source.client, 1);
638 snd_seq_prioq_leave(q->timeq, ev->source.client, 1);
639 if (! snd_seq_timer_start(q->timer))
640 queue_broadcast_event(q, ev, atomic, hop);
641 break;
642
643 case SNDRV_SEQ_EVENT_CONTINUE:
644 if (! snd_seq_timer_continue(q->timer))
645 queue_broadcast_event(q, ev, atomic, hop);
646 break;
647
648 case SNDRV_SEQ_EVENT_STOP:
649 snd_seq_timer_stop(q->timer);
650 queue_broadcast_event(q, ev, atomic, hop);
651 break;
652
653 case SNDRV_SEQ_EVENT_TEMPO:
654 snd_seq_timer_set_tempo(q->timer, ev->data.queue.param.value);
655 queue_broadcast_event(q, ev, atomic, hop);
656 break;
657
658 case SNDRV_SEQ_EVENT_SETPOS_TICK:
659 if (snd_seq_timer_set_position_tick(q->timer, ev->data.queue.param.time.tick) == 0) {
660 queue_broadcast_event(q, ev, atomic, hop);
661 }
662 break;
663
664 case SNDRV_SEQ_EVENT_SETPOS_TIME:
665 if (snd_seq_timer_set_position_time(q->timer, ev->data.queue.param.time.time) == 0) {
666 queue_broadcast_event(q, ev, atomic, hop);
667 }
668 break;
669 case SNDRV_SEQ_EVENT_QUEUE_SKEW:
670 if (snd_seq_timer_set_skew(q->timer,
671 ev->data.queue.param.skew.value,
672 ev->data.queue.param.skew.base) == 0) {
673 queue_broadcast_event(q, ev, atomic, hop);
674 }
675 break;
676 }
677}
678
679
680/*
681 * Queue control via timer control port:
682 * this function is exported as a callback of timer port.
683 */
684int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop)
685{
686 struct snd_seq_queue *q;
687
688 if (snd_BUG_ON(!ev))
689 return -EINVAL;
690 q = queueptr(ev->data.queue.queue);
691
692 if (q == NULL)
693 return -EINVAL;
694
695 if (! queue_access_lock(q, ev->source.client)) {
696 queuefree(q);
697 return -EPERM;
698 }
699
700 snd_seq_queue_process_event(q, ev, atomic, hop);
701
702 queue_access_unlock(q);
703 queuefree(q);
704 return 0;
705}
706
707
708/*----------------------------------------------------------------*/
709
710#ifdef CONFIG_SND_PROC_FS
711/* exported to seq_info.c */
712void snd_seq_info_queues_read(struct snd_info_entry *entry,
713 struct snd_info_buffer *buffer)
714{
715 int i, bpm;
716 struct snd_seq_queue *q;
717 struct snd_seq_timer *tmr;
718 bool locked;
719 int owner;
720
721 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
722 q = queueptr(i);
723 if (!q)
724 continue;
725
726 tmr = q->timer;
727 if (tmr->tempo)
728 bpm = (60000 * tmr->tempo_base) / tmr->tempo;
729 else
730 bpm = 0;
731
732 scoped_guard(spinlock_irq, &q->owner_lock) {
733 locked = q->locked;
734 owner = q->owner;
735 }
736
737 snd_iprintf(buffer, "queue %d: [%s]\n", q->queue, q->name);
738 snd_iprintf(buffer, "owned by client : %d\n", owner);
739 snd_iprintf(buffer, "lock status : %s\n", locked ? "Locked" : "Free");
740 snd_iprintf(buffer, "queued time events : %d\n", snd_seq_prioq_avail(q->timeq));
741 snd_iprintf(buffer, "queued tick events : %d\n", snd_seq_prioq_avail(q->tickq));
742 snd_iprintf(buffer, "timer state : %s\n", tmr->running ? "Running" : "Stopped");
743 snd_iprintf(buffer, "timer PPQ : %d\n", tmr->ppq);
744 snd_iprintf(buffer, "current tempo : %d\n", tmr->tempo);
745 snd_iprintf(buffer, "tempo base : %d ns\n", tmr->tempo_base);
746 snd_iprintf(buffer, "current BPM : %d\n", bpm);
747 snd_iprintf(buffer, "current time : %d.%09d s\n", tmr->cur_time.tv_sec, tmr->cur_time.tv_nsec);
748 snd_iprintf(buffer, "current tick : %d\n", tmr->tick.cur_tick);
749 snd_iprintf(buffer, "\n");
750 queuefree(q);
751 }
752}
753#endif /* CONFIG_SND_PROC_FS */
754