Loading...
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/*
2 * ALSA sequencer Timing queue handling
3 * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * MAJOR CHANGES
20 * Nov. 13, 1999 Takashi Iwai <iwai@ww.uni-erlangen.de>
21 * - Queues are allocated dynamically via ioctl.
22 * - When owner client is deleted, all owned queues are deleted, too.
23 * - Owner of unlocked queue is kept unmodified even if it is
24 * manipulated by other clients.
25 * - Owner field in SET_QUEUE_OWNER ioctl must be identical with the
26 * caller client. i.e. Changing owner to a third client is not
27 * allowed.
28 *
29 * Aug. 30, 2000 Takashi Iwai
30 * - Queues are managed in static array again, but with better way.
31 * The API itself is identical.
32 * - The queue is locked when struct snd_seq_queue pointer is returned via
33 * queueptr(). This pointer *MUST* be released afterward by
34 * queuefree(ptr).
35 * - Addition of experimental sync support.
36 */
37
38#include <linux/init.h>
39#include <linux/slab.h>
40#include <sound/core.h>
41
42#include "seq_memory.h"
43#include "seq_queue.h"
44#include "seq_clientmgr.h"
45#include "seq_fifo.h"
46#include "seq_timer.h"
47#include "seq_info.h"
48
49/* list of allocated queues */
50static struct snd_seq_queue *queue_list[SNDRV_SEQ_MAX_QUEUES];
51static DEFINE_SPINLOCK(queue_list_lock);
52/* number of queues allocated */
53static int num_queues;
54
55int snd_seq_queue_get_cur_queues(void)
56{
57 return num_queues;
58}
59
60/*----------------------------------------------------------------*/
61
62/* assign queue id and insert to list */
63static int queue_list_add(struct snd_seq_queue *q)
64{
65 int i;
66 unsigned long flags;
67
68 spin_lock_irqsave(&queue_list_lock, flags);
69 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
70 if (! queue_list[i]) {
71 queue_list[i] = q;
72 q->queue = i;
73 num_queues++;
74 spin_unlock_irqrestore(&queue_list_lock, flags);
75 return i;
76 }
77 }
78 spin_unlock_irqrestore(&queue_list_lock, flags);
79 return -1;
80}
81
82static struct snd_seq_queue *queue_list_remove(int id, int client)
83{
84 struct snd_seq_queue *q;
85 unsigned long flags;
86
87 spin_lock_irqsave(&queue_list_lock, flags);
88 q = queue_list[id];
89 if (q) {
90 spin_lock(&q->owner_lock);
91 if (q->owner == client) {
92 /* found */
93 q->klocked = 1;
94 spin_unlock(&q->owner_lock);
95 queue_list[id] = NULL;
96 num_queues--;
97 spin_unlock_irqrestore(&queue_list_lock, flags);
98 return q;
99 }
100 spin_unlock(&q->owner_lock);
101 }
102 spin_unlock_irqrestore(&queue_list_lock, flags);
103 return NULL;
104}
105
106/*----------------------------------------------------------------*/
107
108/* create new queue (constructor) */
109static struct snd_seq_queue *queue_new(int owner, int locked)
110{
111 struct snd_seq_queue *q;
112
113 q = kzalloc(sizeof(*q), GFP_KERNEL);
114 if (!q)
115 return NULL;
116
117 spin_lock_init(&q->owner_lock);
118 spin_lock_init(&q->check_lock);
119 mutex_init(&q->timer_mutex);
120 snd_use_lock_init(&q->use_lock);
121 q->queue = -1;
122
123 q->tickq = snd_seq_prioq_new();
124 q->timeq = snd_seq_prioq_new();
125 q->timer = snd_seq_timer_new();
126 if (q->tickq == NULL || q->timeq == NULL || q->timer == NULL) {
127 snd_seq_prioq_delete(&q->tickq);
128 snd_seq_prioq_delete(&q->timeq);
129 snd_seq_timer_delete(&q->timer);
130 kfree(q);
131 return NULL;
132 }
133
134 q->owner = owner;
135 q->locked = locked;
136 q->klocked = 0;
137
138 return q;
139}
140
141/* delete queue (destructor) */
142static void queue_delete(struct snd_seq_queue *q)
143{
144 /* stop and release the timer */
145 mutex_lock(&q->timer_mutex);
146 snd_seq_timer_stop(q->timer);
147 snd_seq_timer_close(q);
148 mutex_unlock(&q->timer_mutex);
149 /* wait until access free */
150 snd_use_lock_sync(&q->use_lock);
151 /* release resources... */
152 snd_seq_prioq_delete(&q->tickq);
153 snd_seq_prioq_delete(&q->timeq);
154 snd_seq_timer_delete(&q->timer);
155
156 kfree(q);
157}
158
159
160/*----------------------------------------------------------------*/
161
162/* setup queues */
163int __init snd_seq_queues_init(void)
164{
165 /*
166 memset(queue_list, 0, sizeof(queue_list));
167 num_queues = 0;
168 */
169 return 0;
170}
171
172/* delete all existing queues */
173void __exit snd_seq_queues_delete(void)
174{
175 int i;
176
177 /* clear list */
178 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
179 if (queue_list[i])
180 queue_delete(queue_list[i]);
181 }
182}
183
184static void queue_use(struct snd_seq_queue *queue, int client, int use);
185
186/* allocate a new queue -
187 * return queue index value or negative value for error
188 */
189int snd_seq_queue_alloc(int client, int locked, unsigned int info_flags)
190{
191 struct snd_seq_queue *q;
192
193 q = queue_new(client, locked);
194 if (q == NULL)
195 return -ENOMEM;
196 q->info_flags = info_flags;
197 queue_use(q, client, 1);
198 if (queue_list_add(q) < 0) {
199 queue_delete(q);
200 return -ENOMEM;
201 }
202 return q->queue;
203}
204
205/* delete a queue - queue must be owned by the client */
206int snd_seq_queue_delete(int client, int queueid)
207{
208 struct snd_seq_queue *q;
209
210 if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
211 return -EINVAL;
212 q = queue_list_remove(queueid, client);
213 if (q == NULL)
214 return -EINVAL;
215 queue_delete(q);
216
217 return 0;
218}
219
220
221/* return pointer to queue structure for specified id */
222struct snd_seq_queue *queueptr(int queueid)
223{
224 struct snd_seq_queue *q;
225 unsigned long flags;
226
227 if (queueid < 0 || queueid >= SNDRV_SEQ_MAX_QUEUES)
228 return NULL;
229 spin_lock_irqsave(&queue_list_lock, flags);
230 q = queue_list[queueid];
231 if (q)
232 snd_use_lock_use(&q->use_lock);
233 spin_unlock_irqrestore(&queue_list_lock, flags);
234 return q;
235}
236
237/* return the (first) queue matching with the specified name */
238struct snd_seq_queue *snd_seq_queue_find_name(char *name)
239{
240 int i;
241 struct snd_seq_queue *q;
242
243 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
244 if ((q = queueptr(i)) != NULL) {
245 if (strncmp(q->name, name, sizeof(q->name)) == 0)
246 return q;
247 queuefree(q);
248 }
249 }
250 return NULL;
251}
252
253
254/* -------------------------------------------------------- */
255
256void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop)
257{
258 unsigned long flags;
259 struct snd_seq_event_cell *cell;
260
261 if (q == NULL)
262 return;
263
264 /* make this function non-reentrant */
265 spin_lock_irqsave(&q->check_lock, flags);
266 if (q->check_blocked) {
267 q->check_again = 1;
268 spin_unlock_irqrestore(&q->check_lock, flags);
269 return; /* other thread is already checking queues */
270 }
271 q->check_blocked = 1;
272 spin_unlock_irqrestore(&q->check_lock, flags);
273
274 __again:
275 /* Process tick queue... */
276 while ((cell = snd_seq_prioq_cell_peek(q->tickq)) != NULL) {
277 if (snd_seq_compare_tick_time(&q->timer->tick.cur_tick,
278 &cell->event.time.tick)) {
279 cell = snd_seq_prioq_cell_out(q->tickq);
280 if (cell)
281 snd_seq_dispatch_event(cell, atomic, hop);
282 } else {
283 /* event remains in the queue */
284 break;
285 }
286 }
287
288
289 /* Process time queue... */
290 while ((cell = snd_seq_prioq_cell_peek(q->timeq)) != NULL) {
291 if (snd_seq_compare_real_time(&q->timer->cur_time,
292 &cell->event.time.time)) {
293 cell = snd_seq_prioq_cell_out(q->timeq);
294 if (cell)
295 snd_seq_dispatch_event(cell, atomic, hop);
296 } else {
297 /* event remains in the queue */
298 break;
299 }
300 }
301
302 /* free lock */
303 spin_lock_irqsave(&q->check_lock, flags);
304 if (q->check_again) {
305 q->check_again = 0;
306 spin_unlock_irqrestore(&q->check_lock, flags);
307 goto __again;
308 }
309 q->check_blocked = 0;
310 spin_unlock_irqrestore(&q->check_lock, flags);
311}
312
313
314/* enqueue a event to singe queue */
315int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop)
316{
317 int dest, err;
318 struct snd_seq_queue *q;
319
320 if (snd_BUG_ON(!cell))
321 return -EINVAL;
322 dest = cell->event.queue; /* destination queue */
323 q = queueptr(dest);
324 if (q == NULL)
325 return -EINVAL;
326 /* handle relative time stamps, convert them into absolute */
327 if ((cell->event.flags & SNDRV_SEQ_TIME_MODE_MASK) == SNDRV_SEQ_TIME_MODE_REL) {
328 switch (cell->event.flags & SNDRV_SEQ_TIME_STAMP_MASK) {
329 case SNDRV_SEQ_TIME_STAMP_TICK:
330 cell->event.time.tick += q->timer->tick.cur_tick;
331 break;
332
333 case SNDRV_SEQ_TIME_STAMP_REAL:
334 snd_seq_inc_real_time(&cell->event.time.time,
335 &q->timer->cur_time);
336 break;
337 }
338 cell->event.flags &= ~SNDRV_SEQ_TIME_MODE_MASK;
339 cell->event.flags |= SNDRV_SEQ_TIME_MODE_ABS;
340 }
341 /* enqueue event in the real-time or midi queue */
342 switch (cell->event.flags & SNDRV_SEQ_TIME_STAMP_MASK) {
343 case SNDRV_SEQ_TIME_STAMP_TICK:
344 err = snd_seq_prioq_cell_in(q->tickq, cell);
345 break;
346
347 case SNDRV_SEQ_TIME_STAMP_REAL:
348 default:
349 err = snd_seq_prioq_cell_in(q->timeq, cell);
350 break;
351 }
352
353 if (err < 0) {
354 queuefree(q); /* unlock */
355 return err;
356 }
357
358 /* trigger dispatching */
359 snd_seq_check_queue(q, atomic, hop);
360
361 queuefree(q); /* unlock */
362
363 return 0;
364}
365
366
367/*----------------------------------------------------------------*/
368
369static inline int check_access(struct snd_seq_queue *q, int client)
370{
371 return (q->owner == client) || (!q->locked && !q->klocked);
372}
373
374/* check if the client has permission to modify queue parameters.
375 * if it does, lock the queue
376 */
377static int queue_access_lock(struct snd_seq_queue *q, int client)
378{
379 unsigned long flags;
380 int access_ok;
381
382 spin_lock_irqsave(&q->owner_lock, flags);
383 access_ok = check_access(q, client);
384 if (access_ok)
385 q->klocked = 1;
386 spin_unlock_irqrestore(&q->owner_lock, flags);
387 return access_ok;
388}
389
390/* unlock the queue */
391static inline void queue_access_unlock(struct snd_seq_queue *q)
392{
393 unsigned long flags;
394
395 spin_lock_irqsave(&q->owner_lock, flags);
396 q->klocked = 0;
397 spin_unlock_irqrestore(&q->owner_lock, flags);
398}
399
400/* exported - only checking permission */
401int snd_seq_queue_check_access(int queueid, int client)
402{
403 struct snd_seq_queue *q = queueptr(queueid);
404 int access_ok;
405 unsigned long flags;
406
407 if (! q)
408 return 0;
409 spin_lock_irqsave(&q->owner_lock, flags);
410 access_ok = check_access(q, client);
411 spin_unlock_irqrestore(&q->owner_lock, flags);
412 queuefree(q);
413 return access_ok;
414}
415
416/*----------------------------------------------------------------*/
417
418/*
419 * change queue's owner and permission
420 */
421int snd_seq_queue_set_owner(int queueid, int client, int locked)
422{
423 struct snd_seq_queue *q = queueptr(queueid);
424
425 if (q == NULL)
426 return -EINVAL;
427
428 if (! queue_access_lock(q, client)) {
429 queuefree(q);
430 return -EPERM;
431 }
432
433 q->locked = locked ? 1 : 0;
434 q->owner = client;
435 queue_access_unlock(q);
436 queuefree(q);
437
438 return 0;
439}
440
441
442/*----------------------------------------------------------------*/
443
444/* open timer -
445 * q->use mutex should be down before calling this function to avoid
446 * confliction with snd_seq_queue_use()
447 */
448int snd_seq_queue_timer_open(int queueid)
449{
450 int result = 0;
451 struct snd_seq_queue *queue;
452 struct snd_seq_timer *tmr;
453
454 queue = queueptr(queueid);
455 if (queue == NULL)
456 return -EINVAL;
457 tmr = queue->timer;
458 if ((result = snd_seq_timer_open(queue)) < 0) {
459 snd_seq_timer_defaults(tmr);
460 result = snd_seq_timer_open(queue);
461 }
462 queuefree(queue);
463 return result;
464}
465
466/* close timer -
467 * q->use mutex should be down before calling this function
468 */
469int snd_seq_queue_timer_close(int queueid)
470{
471 struct snd_seq_queue *queue;
472 int result = 0;
473
474 queue = queueptr(queueid);
475 if (queue == NULL)
476 return -EINVAL;
477 snd_seq_timer_close(queue);
478 queuefree(queue);
479 return result;
480}
481
482/* change queue tempo and ppq */
483int snd_seq_queue_timer_set_tempo(int queueid, int client,
484 struct snd_seq_queue_tempo *info)
485{
486 struct snd_seq_queue *q = queueptr(queueid);
487 int result;
488
489 if (q == NULL)
490 return -EINVAL;
491 if (! queue_access_lock(q, client)) {
492 queuefree(q);
493 return -EPERM;
494 }
495
496 result = snd_seq_timer_set_tempo(q->timer, info->tempo);
497 if (result >= 0)
498 result = snd_seq_timer_set_ppq(q->timer, info->ppq);
499 if (result >= 0 && info->skew_base > 0)
500 result = snd_seq_timer_set_skew(q->timer, info->skew_value,
501 info->skew_base);
502 queue_access_unlock(q);
503 queuefree(q);
504 return result;
505}
506
507/* use or unuse this queue */
508static void queue_use(struct snd_seq_queue *queue, int client, int use)
509{
510 if (use) {
511 if (!test_and_set_bit(client, queue->clients_bitmap))
512 queue->clients++;
513 } else {
514 if (test_and_clear_bit(client, queue->clients_bitmap))
515 queue->clients--;
516 }
517 if (queue->clients) {
518 if (use && queue->clients == 1)
519 snd_seq_timer_defaults(queue->timer);
520 snd_seq_timer_open(queue);
521 } else {
522 snd_seq_timer_close(queue);
523 }
524}
525
526/* use or unuse this queue -
527 * if it is the first client, starts the timer.
528 * if it is not longer used by any clients, stop the timer.
529 */
530int snd_seq_queue_use(int queueid, int client, int use)
531{
532 struct snd_seq_queue *queue;
533
534 queue = queueptr(queueid);
535 if (queue == NULL)
536 return -EINVAL;
537 mutex_lock(&queue->timer_mutex);
538 queue_use(queue, client, use);
539 mutex_unlock(&queue->timer_mutex);
540 queuefree(queue);
541 return 0;
542}
543
544/*
545 * check if queue is used by the client
546 * return negative value if the queue is invalid.
547 * return 0 if not used, 1 if used.
548 */
549int snd_seq_queue_is_used(int queueid, int client)
550{
551 struct snd_seq_queue *q;
552 int result;
553
554 q = queueptr(queueid);
555 if (q == NULL)
556 return -EINVAL; /* invalid queue */
557 result = test_bit(client, q->clients_bitmap) ? 1 : 0;
558 queuefree(q);
559 return result;
560}
561
562
563/*----------------------------------------------------------------*/
564
565/* notification that client has left the system -
566 * stop the timer on all queues owned by this client
567 */
568void snd_seq_queue_client_termination(int client)
569{
570 unsigned long flags;
571 int i;
572 struct snd_seq_queue *q;
573
574 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
575 if ((q = queueptr(i)) == NULL)
576 continue;
577 spin_lock_irqsave(&q->owner_lock, flags);
578 if (q->owner == client)
579 q->klocked = 1;
580 spin_unlock_irqrestore(&q->owner_lock, flags);
581 if (q->owner == client) {
582 if (q->timer->running)
583 snd_seq_timer_stop(q->timer);
584 snd_seq_timer_reset(q->timer);
585 }
586 queuefree(q);
587 }
588}
589
590/* final stage notification -
591 * remove cells for no longer exist client (for non-owned queue)
592 * or delete this queue (for owned queue)
593 */
594void snd_seq_queue_client_leave(int client)
595{
596 int i;
597 struct snd_seq_queue *q;
598
599 /* delete own queues from queue list */
600 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
601 if ((q = queue_list_remove(i, client)) != NULL)
602 queue_delete(q);
603 }
604
605 /* remove cells from existing queues -
606 * they are not owned by this client
607 */
608 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
609 if ((q = queueptr(i)) == NULL)
610 continue;
611 if (test_bit(client, q->clients_bitmap)) {
612 snd_seq_prioq_leave(q->tickq, client, 0);
613 snd_seq_prioq_leave(q->timeq, client, 0);
614 snd_seq_queue_use(q->queue, client, 0);
615 }
616 queuefree(q);
617 }
618}
619
620
621
622/*----------------------------------------------------------------*/
623
624/* remove cells from all queues */
625void snd_seq_queue_client_leave_cells(int client)
626{
627 int i;
628 struct snd_seq_queue *q;
629
630 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
631 if ((q = queueptr(i)) == NULL)
632 continue;
633 snd_seq_prioq_leave(q->tickq, client, 0);
634 snd_seq_prioq_leave(q->timeq, client, 0);
635 queuefree(q);
636 }
637}
638
639/* remove cells based on flush criteria */
640void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info)
641{
642 int i;
643 struct snd_seq_queue *q;
644
645 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
646 if ((q = queueptr(i)) == NULL)
647 continue;
648 if (test_bit(client, q->clients_bitmap) &&
649 (! (info->remove_mode & SNDRV_SEQ_REMOVE_DEST) ||
650 q->queue == info->queue)) {
651 snd_seq_prioq_remove_events(q->tickq, client, info);
652 snd_seq_prioq_remove_events(q->timeq, client, info);
653 }
654 queuefree(q);
655 }
656}
657
658/*----------------------------------------------------------------*/
659
660/*
661 * send events to all subscribed ports
662 */
663static void queue_broadcast_event(struct snd_seq_queue *q, struct snd_seq_event *ev,
664 int atomic, int hop)
665{
666 struct snd_seq_event sev;
667
668 sev = *ev;
669
670 sev.flags = SNDRV_SEQ_TIME_STAMP_TICK|SNDRV_SEQ_TIME_MODE_ABS;
671 sev.time.tick = q->timer->tick.cur_tick;
672 sev.queue = q->queue;
673 sev.data.queue.queue = q->queue;
674
675 /* broadcast events from Timer port */
676 sev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
677 sev.source.port = SNDRV_SEQ_PORT_SYSTEM_TIMER;
678 sev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
679 snd_seq_kernel_client_dispatch(SNDRV_SEQ_CLIENT_SYSTEM, &sev, atomic, hop);
680}
681
682/*
683 * process a received queue-control event.
684 * this function is exported for seq_sync.c.
685 */
686static void snd_seq_queue_process_event(struct snd_seq_queue *q,
687 struct snd_seq_event *ev,
688 int atomic, int hop)
689{
690 switch (ev->type) {
691 case SNDRV_SEQ_EVENT_START:
692 snd_seq_prioq_leave(q->tickq, ev->source.client, 1);
693 snd_seq_prioq_leave(q->timeq, ev->source.client, 1);
694 if (! snd_seq_timer_start(q->timer))
695 queue_broadcast_event(q, ev, atomic, hop);
696 break;
697
698 case SNDRV_SEQ_EVENT_CONTINUE:
699 if (! snd_seq_timer_continue(q->timer))
700 queue_broadcast_event(q, ev, atomic, hop);
701 break;
702
703 case SNDRV_SEQ_EVENT_STOP:
704 snd_seq_timer_stop(q->timer);
705 queue_broadcast_event(q, ev, atomic, hop);
706 break;
707
708 case SNDRV_SEQ_EVENT_TEMPO:
709 snd_seq_timer_set_tempo(q->timer, ev->data.queue.param.value);
710 queue_broadcast_event(q, ev, atomic, hop);
711 break;
712
713 case SNDRV_SEQ_EVENT_SETPOS_TICK:
714 if (snd_seq_timer_set_position_tick(q->timer, ev->data.queue.param.time.tick) == 0) {
715 queue_broadcast_event(q, ev, atomic, hop);
716 }
717 break;
718
719 case SNDRV_SEQ_EVENT_SETPOS_TIME:
720 if (snd_seq_timer_set_position_time(q->timer, ev->data.queue.param.time.time) == 0) {
721 queue_broadcast_event(q, ev, atomic, hop);
722 }
723 break;
724 case SNDRV_SEQ_EVENT_QUEUE_SKEW:
725 if (snd_seq_timer_set_skew(q->timer,
726 ev->data.queue.param.skew.value,
727 ev->data.queue.param.skew.base) == 0) {
728 queue_broadcast_event(q, ev, atomic, hop);
729 }
730 break;
731 }
732}
733
734
735/*
736 * Queue control via timer control port:
737 * this function is exported as a callback of timer port.
738 */
739int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop)
740{
741 struct snd_seq_queue *q;
742
743 if (snd_BUG_ON(!ev))
744 return -EINVAL;
745 q = queueptr(ev->data.queue.queue);
746
747 if (q == NULL)
748 return -EINVAL;
749
750 if (! queue_access_lock(q, ev->source.client)) {
751 queuefree(q);
752 return -EPERM;
753 }
754
755 snd_seq_queue_process_event(q, ev, atomic, hop);
756
757 queue_access_unlock(q);
758 queuefree(q);
759 return 0;
760}
761
762
763/*----------------------------------------------------------------*/
764
765#ifdef CONFIG_SND_PROC_FS
766/* exported to seq_info.c */
767void snd_seq_info_queues_read(struct snd_info_entry *entry,
768 struct snd_info_buffer *buffer)
769{
770 int i, bpm;
771 struct snd_seq_queue *q;
772 struct snd_seq_timer *tmr;
773
774 for (i = 0; i < SNDRV_SEQ_MAX_QUEUES; i++) {
775 if ((q = queueptr(i)) == NULL)
776 continue;
777
778 tmr = q->timer;
779 if (tmr->tempo)
780 bpm = 60000000 / tmr->tempo;
781 else
782 bpm = 0;
783
784 snd_iprintf(buffer, "queue %d: [%s]\n", q->queue, q->name);
785 snd_iprintf(buffer, "owned by client : %d\n", q->owner);
786 snd_iprintf(buffer, "lock status : %s\n", q->locked ? "Locked" : "Free");
787 snd_iprintf(buffer, "queued time events : %d\n", snd_seq_prioq_avail(q->timeq));
788 snd_iprintf(buffer, "queued tick events : %d\n", snd_seq_prioq_avail(q->tickq));
789 snd_iprintf(buffer, "timer state : %s\n", tmr->running ? "Running" : "Stopped");
790 snd_iprintf(buffer, "timer PPQ : %d\n", tmr->ppq);
791 snd_iprintf(buffer, "current tempo : %d\n", tmr->tempo);
792 snd_iprintf(buffer, "current BPM : %d\n", bpm);
793 snd_iprintf(buffer, "current time : %d.%09d s\n", tmr->cur_time.tv_sec, tmr->cur_time.tv_nsec);
794 snd_iprintf(buffer, "current tick : %d\n", tmr->tick.cur_tick);
795 snd_iprintf(buffer, "\n");
796 queuefree(q);
797 }
798}
799#endif /* CONFIG_SND_PROC_FS */
800