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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ALSA sequencer Client Manager
4 * Copyright (c) 1998-2001 by Frank van de Pol <[email protected]>
5 * Jaroslav Kysela <[email protected]>
6 * Takashi Iwai <[email protected]>
7 */
8
9#include <linux/init.h>
10#include <linux/export.h>
11#include <linux/slab.h>
12#include <sound/core.h>
13#include <sound/minors.h>
14#include <linux/kmod.h>
15
16#include <sound/seq_kernel.h>
17#include <sound/ump.h>
18#include "seq_clientmgr.h"
19#include "seq_memory.h"
20#include "seq_queue.h"
21#include "seq_timer.h"
22#include "seq_info.h"
23#include "seq_system.h"
24#include "seq_ump_convert.h"
25#include <sound/seq_device.h>
26#ifdef CONFIG_COMPAT
27#include <linux/compat.h>
28#endif
29
30/* Client Manager
31
32 * this module handles the connections of userland and kernel clients
33 *
34 */
35
36/*
37 * There are four ranges of client numbers (last two shared):
38 * 0..15: global clients
39 * 16..127: statically allocated client numbers for cards 0..27
40 * 128..191: dynamically allocated client numbers for cards 28..31
41 * 128..191: dynamically allocated client numbers for applications
42 */
43
44/* number of kernel non-card clients */
45#define SNDRV_SEQ_GLOBAL_CLIENTS 16
46/* clients per cards, for static clients */
47#define SNDRV_SEQ_CLIENTS_PER_CARD 4
48/* dynamically allocated client numbers (both kernel drivers and user space) */
49#define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
50
51#define SNDRV_SEQ_LFLG_INPUT 0x0001
52#define SNDRV_SEQ_LFLG_OUTPUT 0x0002
53#define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
54
55static DEFINE_SPINLOCK(clients_lock);
56static DEFINE_MUTEX(register_mutex);
57
58/*
59 * client table
60 */
61static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
62static struct snd_seq_client __rcu *clienttab[SNDRV_SEQ_MAX_CLIENTS];
63static struct snd_seq_usage client_usage;
64
65/*
66 * prototypes
67 */
68static int bounce_error_event(struct snd_seq_client *client,
69 struct snd_seq_event *event,
70 int err, int atomic, int hop);
71static int snd_seq_deliver_single_event(struct snd_seq_client *client,
72 struct snd_seq_event *event,
73 int atomic, int hop);
74
75#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
76static void free_ump_info(struct snd_seq_client *client);
77#endif
78
79/*
80 */
81static inline unsigned short snd_seq_file_flags(struct file *file)
82{
83 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
84 case FMODE_WRITE:
85 return SNDRV_SEQ_LFLG_OUTPUT;
86 case FMODE_READ:
87 return SNDRV_SEQ_LFLG_INPUT;
88 default:
89 return SNDRV_SEQ_LFLG_OPEN;
90 }
91}
92
93static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
94{
95 return snd_seq_total_cells(client->pool) > 0;
96}
97
98/* return pointer to client structure for specified id; call under RCU read-lock */
99static struct snd_seq_client *__clientptr(int clientid)
100{
101 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
102 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
103 clientid);
104 return NULL;
105 }
106 return rcu_dereference_check(clienttab[clientid],
107 lockdep_is_held(&clients_lock));
108}
109
110/* return pointer to client structure for specified id */
111static struct snd_seq_client *clientptr(int clientid)
112{
113 guard(rcu)();
114 return __clientptr(clientid);
115}
116
117static struct snd_seq_client *client_use_ptr(int clientid, bool load_module)
118{
119 struct snd_seq_client *client;
120
121 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
122 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
123 clientid);
124 return NULL;
125 }
126 scoped_guard(rcu) {
127 client = __clientptr(clientid);
128 if (client)
129 return snd_seq_client_ref(client);
130 if (clienttablock[clientid])
131 return NULL;
132 }
133#ifdef CONFIG_MODULES
134 if (load_module) {
135 static DECLARE_BITMAP(client_requested, SNDRV_SEQ_GLOBAL_CLIENTS);
136 static DECLARE_BITMAP(card_requested, SNDRV_CARDS);
137
138 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
139 int idx;
140
141 if (!test_and_set_bit(clientid, client_requested)) {
142 for (idx = 0; idx < 15; idx++) {
143 if (seq_client_load[idx] < 0)
144 break;
145 if (seq_client_load[idx] == clientid) {
146 request_module("snd-seq-client-%i",
147 clientid);
148 break;
149 }
150 }
151 }
152 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
153 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
154 SNDRV_SEQ_CLIENTS_PER_CARD;
155 if (card < snd_ecards_limit) {
156 if (!test_and_set_bit(card, card_requested))
157 snd_request_card(card);
158 snd_seq_device_load_drivers();
159 }
160 }
161 scoped_guard(rcu) {
162 client = __clientptr(clientid);
163 if (client)
164 return snd_seq_client_ref(client);
165 }
166 }
167#endif
168 return NULL;
169}
170
171/* get snd_seq_client object for the given id quickly */
172struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
173{
174 return client_use_ptr(clientid, false);
175}
176
177/* get snd_seq_client object for the given id;
178 * if not found, retry after loading the modules
179 */
180static struct snd_seq_client *client_load_and_use_ptr(int clientid)
181{
182 return client_use_ptr(clientid, IS_ENABLED(CONFIG_MODULES));
183}
184
185static void usage_alloc(struct snd_seq_usage *res, int num)
186{
187 res->cur += num;
188 if (res->cur > res->peak)
189 res->peak = res->cur;
190}
191
192static void usage_free(struct snd_seq_usage *res, int num)
193{
194 res->cur -= num;
195}
196
197/* initialise data structures */
198int __init client_init_data(void)
199{
200 /* zap out the client table */
201 memset(&clienttablock, 0, sizeof(clienttablock));
202 memset(&clienttab, 0, sizeof(clienttab));
203 return 0;
204}
205
206
207static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
208{
209 int c;
210 struct snd_seq_client *client;
211
212 /* init client data */
213 client = kzalloc_obj(*client);
214 if (client == NULL)
215 return NULL;
216 client->pool = snd_seq_pool_new(poolsize);
217 if (client->pool == NULL) {
218 kfree(client);
219 return NULL;
220 }
221 client->type = NO_CLIENT;
222 snd_use_lock_init(&client->use_lock);
223 mutex_init(&client->ports_mutex);
224 INIT_LIST_HEAD(&client->ports_list_head);
225 mutex_init(&client->ioctl_mutex);
226 client->ump_endpoint_port = -1;
227
228 /* find free slot in the client table */
229 scoped_guard(spinlock_irq, &clients_lock) {
230 if (client_index < 0) {
231 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
232 c < SNDRV_SEQ_MAX_CLIENTS;
233 c++) {
234 if (rcu_access_pointer(clienttab[c]) || clienttablock[c])
235 continue;
236 client->number = c;
237 rcu_assign_pointer(clienttab[c], client);
238 return client;
239 }
240 } else {
241 if (rcu_access_pointer(clienttab[client_index]) == NULL &&
242 !clienttablock[client_index]) {
243 client->number = client_index;
244 rcu_assign_pointer(clienttab[client_index], client);
245 return client;
246 }
247 }
248 }
249
250 snd_seq_pool_delete(&client->pool);
251 kfree(client);
252 return NULL; /* no free slot found or busy, return failure code */
253}
254
255
256static int seq_free_client1(struct snd_seq_client *client)
257{
258 if (!client)
259 return 0;
260 scoped_guard(spinlock_irq, &clients_lock) {
261 clienttablock[client->number] = 1;
262 rcu_assign_pointer(clienttab[client->number], NULL);
263 }
264 snd_seq_delete_all_ports(client);
265 snd_seq_queue_client_leave(client->number);
266 /* the client has been unpublished from the table; wait for a grace
267 * period so that lockless readers (snd_seq_client_use_ptr()) that
268 * observed the old pointer can no longer take a new use_lock
269 * reference, then drain the outstanding references before freeing
270 */
271 synchronize_rcu();
272 snd_use_lock_sync(&client->use_lock);
273 if (client->pool)
274 snd_seq_pool_delete(&client->pool);
275 scoped_guard(spinlock_irq, &clients_lock) {
276 clienttablock[client->number] = 0;
277 }
278 return 0;
279}
280
281
282static void seq_free_client(struct snd_seq_client * client)
283{
284 scoped_guard(mutex, &register_mutex) {
285 switch (client->type) {
286 case NO_CLIENT:
287 pr_warn("ALSA: seq: Trying to free unused client %d\n",
288 client->number);
289 break;
290 case USER_CLIENT:
291 case KERNEL_CLIENT:
292 seq_free_client1(client);
293 usage_free(&client_usage, 1);
294 break;
295
296 default:
297 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
298 client->number, client->type);
299 }
300 }
301
302 snd_seq_system_client_ev_client_exit(client->number);
303}
304
305
306
307/* -------------------------------------------------------- */
308
309/* create a user client */
310static int snd_seq_open(struct inode *inode, struct file *file)
311{
312 int c, mode; /* client id */
313 struct snd_seq_client *client;
314 struct snd_seq_user_client *user;
315
316 stream_open(inode, file);
317
318 scoped_guard(mutex, &register_mutex) {
319 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
320 if (!client)
321 return -ENOMEM; /* failure code */
322
323 mode = snd_seq_file_flags(file);
324 if (mode & SNDRV_SEQ_LFLG_INPUT)
325 client->accept_input = 1;
326 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
327 client->accept_output = 1;
328
329 user = &client->data.user;
330 user->fifo = NULL;
331 user->fifo_pool_size = 0;
332
333 if (mode & SNDRV_SEQ_LFLG_INPUT) {
334 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
335 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
336 if (user->fifo == NULL) {
337 seq_free_client1(client);
338 kfree(client);
339 return -ENOMEM;
340 }
341 }
342
343 usage_alloc(&client_usage, 1);
344 client->type = USER_CLIENT;
345 }
346
347 c = client->number;
348 file->private_data = client;
349
350 /* fill client data */
351 user->file = file;
352 sprintf(client->name, "Client-%d", c);
353 client->data.user.owner = get_pid(task_pid(current));
354
355 /* make others aware this new client */
356 snd_seq_system_client_ev_client_start(c);
357
358 return 0;
359}
360
361/* delete a user client */
362static int snd_seq_release(struct inode *inode, struct file *file)
363{
364 struct snd_seq_client *client = file->private_data;
365
366 if (client) {
367 seq_free_client(client);
368 if (client->data.user.fifo)
369 snd_seq_fifo_delete(&client->data.user.fifo);
370#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
371 free_ump_info(client);
372#endif
373 put_pid(client->data.user.owner);
374 kfree(client);
375 }
376
377 return 0;
378}
379
380static bool event_is_compatible(const struct snd_seq_client *client,
381 const struct snd_seq_event *ev)
382{
383 if (snd_seq_ev_is_ump(ev) && !client->midi_version)
384 return false;
385 if (snd_seq_ev_is_ump(ev) && snd_seq_ev_is_variable(ev))
386 return false;
387 return true;
388}
389
390/* handle client read() */
391/* possible error values:
392 * -ENXIO invalid client or file open mode
393 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
394 * -EINVAL no enough user-space buffer to write the whole event
395 * -EFAULT seg. fault during copy to user space
396 */
397static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
398 loff_t *offset)
399{
400 struct snd_seq_client *client = file->private_data;
401 struct snd_seq_fifo *fifo;
402 size_t aligned_size;
403 int err;
404 long result = 0;
405 struct snd_seq_event_cell *cell;
406
407 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
408 return -ENXIO;
409
410 if (!access_ok(buf, count))
411 return -EFAULT;
412
413 /* check client structures are in place */
414 if (snd_BUG_ON(!client))
415 return -ENXIO;
416
417 if (!client->accept_input)
418 return -ENXIO;
419 fifo = client->data.user.fifo;
420 if (!fifo)
421 return -ENXIO;
422
423 if (atomic_read(&fifo->overflow) > 0) {
424 /* buffer overflow is detected */
425 snd_seq_fifo_clear(fifo);
426 /* return error code */
427 return -ENOSPC;
428 }
429
430 cell = NULL;
431 err = 0;
432 guard(snd_seq_fifo)(fifo);
433
434 if (IS_ENABLED(CONFIG_SND_SEQ_UMP) && client->midi_version > 0)
435 aligned_size = sizeof(struct snd_seq_ump_event);
436 else
437 aligned_size = sizeof(struct snd_seq_event);
438
439 /* while data available in queue */
440 while (count >= aligned_size) {
441 int nonblock;
442
443 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
444 err = snd_seq_fifo_cell_out(fifo, &cell, nonblock);
445 if (err < 0)
446 break;
447 if (!event_is_compatible(client, &cell->event)) {
448 snd_seq_cell_free(cell);
449 cell = NULL;
450 continue;
451 }
452 if (snd_seq_ev_is_variable(&cell->event)) {
453 struct snd_seq_ump_event tmpev;
454
455 memcpy(&tmpev, &cell->event, aligned_size);
456 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
457 tmpev.data.ext.ptr = NULL;
458 if (copy_to_user(buf, &tmpev, aligned_size)) {
459 err = -EFAULT;
460 break;
461 }
462 count -= aligned_size;
463 buf += aligned_size;
464 err = snd_seq_expand_var_event(&cell->event, count,
465 (char __force *)buf, 0,
466 aligned_size);
467 if (err < 0)
468 break;
469 result += err;
470 count -= err;
471 buf += err;
472 } else {
473 if (copy_to_user(buf, &cell->event, aligned_size)) {
474 err = -EFAULT;
475 break;
476 }
477 count -= aligned_size;
478 buf += aligned_size;
479 }
480 snd_seq_cell_free(cell);
481 cell = NULL; /* to be sure */
482 result += aligned_size;
483 }
484
485 if (err < 0) {
486 if (cell)
487 snd_seq_fifo_cell_putback(fifo, cell);
488 if (err == -EAGAIN && result > 0)
489 err = 0;
490 }
491
492 return (err < 0) ? err : result;
493}
494
495
496/*
497 * check access permission to the port
498 */
499static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
500{
501 if ((port->capability & flags) != flags)
502 return 0;
503 return flags;
504}
505
506/*
507 * check if the destination client is available, and return the pointer
508 */
509static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event)
510{
511 struct snd_seq_client *dest __free(snd_seq_client) =
512 snd_seq_client_use_ptr(event->dest.client);
513
514 if (dest == NULL)
515 return NULL;
516 if (! dest->accept_input)
517 return NULL;
518 if (snd_seq_ev_is_ump(event))
519 return no_free_ptr(dest); /* ok - no filter checks */
520
521 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
522 ! test_bit(event->type, dest->event_filter))
523 return NULL;
524
525 return no_free_ptr(dest); /* ok - accessible */
526}
527
528
529/*
530 * Return the error event.
531 *
532 * If the receiver client is a user client, the original event is
533 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. The
534 * external data of a variable length event is not copied along.
535 * If the receiver client is a kernel client, the original event is
536 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
537 * kmalloc.
538 */
539static int bounce_error_event(struct snd_seq_client *client,
540 struct snd_seq_event *event,
541 int err, int atomic, int hop)
542{
543 struct snd_seq_event bounce_ev, quoted;
544 int result;
545
546 if (client == NULL ||
547 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
548 ! client->accept_input)
549 return 0; /* ignored */
550
551 if (event->type == SNDRV_SEQ_EVENT_BOUNCE ||
552 event->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
553 return err; /* avoid re-bouncing */
554
555 /* set up quoted error */
556 memset(&bounce_ev, 0, sizeof(bounce_ev));
557
558 if (client->type == USER_CLIENT) {
559 /*
560 * For user clients, send SNDRV_SEQ_EVENT_BOUNCE with the
561 * original event embedded as variable-length data. This
562 * avoids exposing data.quote.event (a kernel pointer) to
563 * userspace. Sanitise the embedded copy too - a queued
564 * variable-length event carries the address of its own
565 * extension cell, and the payload goes out verbatim.
566 */
567 quoted = *event;
568 if (snd_seq_ev_is_variable(&quoted)) {
569 quoted.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
570 quoted.data.ext.ptr = NULL;
571 }
572 bounce_ev.type = SNDRV_SEQ_EVENT_BOUNCE;
573 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
574 bounce_ev.data.ext.len = sizeof(struct snd_seq_event);
575 bounce_ev.data.ext.ptr = (char *)&quoted;
576 } else {
577 /*
578 * For kernel clients, quote the event pointer directly.
579 * Kernel consumers can safely dereference the pointer.
580 */
581 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
582 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
583 bounce_ev.data.quote.origin = event->dest;
584 bounce_ev.data.quote.event = event;
585 bounce_ev.data.quote.value = -err; /* use positive value */
586 }
587
588 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
589 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
590 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
591 bounce_ev.dest.client = client->number;
592 bounce_ev.dest.port = event->source.port;
593 result = snd_seq_deliver_single_event(NULL, &bounce_ev, atomic, hop + 1);
594 if (result < 0) {
595 client->event_lost++;
596 return result;
597 }
598
599 return result;
600}
601
602
603/*
604 * rewrite the time-stamp of the event record with the curren time
605 * of the given queue.
606 * return non-zero if updated.
607 */
608static int update_timestamp_of_queue(struct snd_seq_event *event,
609 int queue, int real_time)
610{
611 struct snd_seq_queue *q __free(snd_seq_queue) =
612 queueptr(queue);
613
614 if (! q)
615 return 0;
616 event->queue = queue;
617 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
618 if (real_time) {
619 event->time.time = snd_seq_timer_get_cur_time(q->timer, true);
620 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
621 } else {
622 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
623 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
624 }
625 return 1;
626}
627
628/* deliver a single event; called from below and UMP converter */
629int __snd_seq_deliver_single_event(struct snd_seq_client *dest,
630 struct snd_seq_client_port *dest_port,
631 struct snd_seq_event *event,
632 int atomic, int hop)
633{
634 switch (dest->type) {
635 case USER_CLIENT:
636 if (!dest->data.user.fifo)
637 return 0;
638 return snd_seq_fifo_event_in(dest->data.user.fifo, event);
639 case KERNEL_CLIENT:
640 if (!dest_port->event_input)
641 return 0;
642 return dest_port->event_input(event,
643 snd_seq_ev_is_direct(event),
644 dest_port->private_data,
645 atomic, hop);
646 }
647 return 0;
648}
649
650/* deliver a single event; called from snd_seq_deliver_single_event() */
651static int _snd_seq_deliver_single_event(struct snd_seq_client *client,
652 struct snd_seq_event *event,
653 int atomic, int hop)
654{
655 struct snd_seq_client *dest __free(snd_seq_client) =
656 get_event_dest_client(event);
657 if (dest == NULL)
658 return -ENOENT;
659
660 struct snd_seq_client_port *dest_port __free(snd_seq_port) =
661 snd_seq_port_use_ptr(dest, event->dest.port);
662 if (dest_port == NULL)
663 return -ENOENT;
664
665 /* check permission */
666 if (!check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE))
667 return -EPERM;
668
669 if (dest_port->timestamping)
670 update_timestamp_of_queue(event, dest_port->time_queue,
671 dest_port->time_real);
672
673#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
674 if (snd_seq_ev_is_ump(event)) {
675 if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT))
676 return snd_seq_deliver_from_ump(client, dest, dest_port,
677 event, atomic, hop);
678 else if (dest->type == USER_CLIENT &&
679 !snd_seq_client_is_ump(dest))
680 return 0; // drop the event
681 } else if (snd_seq_client_is_ump(dest)) {
682 if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT))
683 return snd_seq_deliver_to_ump(client, dest, dest_port,
684 event, atomic, hop);
685 }
686#endif /* CONFIG_SND_SEQ_UMP */
687
688 return __snd_seq_deliver_single_event(dest, dest_port, event,
689 atomic, hop);
690}
691
692/*
693 * deliver an event to the specified destination.
694 * if filter is non-zero, client filter bitmap is tested.
695 *
696 * RETURN VALUE: 0 : if succeeded
697 * <0 : error
698 */
699static int snd_seq_deliver_single_event(struct snd_seq_client *client,
700 struct snd_seq_event *event,
701 int atomic, int hop)
702{
703 int result = _snd_seq_deliver_single_event(client, event, atomic, hop);
704
705 if (result < 0 && !snd_seq_ev_is_direct(event))
706 return bounce_error_event(client, event, result, atomic, hop);
707 return result;
708}
709
710
711/*
712 * send the event to all subscribers:
713 */
714static int __deliver_to_subscribers(struct snd_seq_client *client,
715 struct snd_seq_event *event,
716 int port, int atomic, int hop)
717{
718 struct snd_seq_subscribers *subs;
719 int err, result = 0, num_ev = 0;
720 union __snd_seq_event event_saved;
721 size_t saved_size;
722 struct snd_seq_port_subs_info *grp;
723
724 if (port < 0)
725 return 0;
726
727 struct snd_seq_client_port *src_port __free(snd_seq_port) =
728 snd_seq_port_use_ptr(client, port);
729 if (!src_port)
730 return 0;
731
732 /* save original event record */
733 saved_size = snd_seq_event_packet_size(event);
734 memcpy(&event_saved, event, saved_size);
735 grp = &src_port->c_src;
736
737 /* lock list */
738 if (atomic)
739 rcu_read_lock();
740 else
741 down_read_nested(&grp->list_mutex, hop);
742 hlist_for_each_entry_rcu(subs, &grp->list_head, src_list,
743 lockdep_is_held(&grp->list_mutex)) {
744 /* both ports ready? */
745 if (atomic_read(&subs->ref_count) != 2)
746 continue;
747 event->dest = subs->info.dest;
748 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
749 /* convert time according to flag with subscription */
750 update_timestamp_of_queue(event, subs->info.queue,
751 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
752 err = snd_seq_deliver_single_event(client, event, atomic, hop);
753 if (err < 0) {
754 /* save first error that occurs and continue */
755 if (!result)
756 result = err;
757 continue;
758 }
759 num_ev++;
760 /* restore original event record */
761 memcpy(event, &event_saved, saved_size);
762 }
763 if (atomic)
764 rcu_read_unlock();
765 else
766 up_read(&grp->list_mutex);
767 memcpy(event, &event_saved, saved_size);
768 return (result < 0) ? result : num_ev;
769}
770
771static int deliver_to_subscribers(struct snd_seq_client *client,
772 struct snd_seq_event *event,
773 int atomic, int hop)
774{
775 int ret;
776#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
777 int ret2;
778#endif
779
780 ret = __deliver_to_subscribers(client, event,
781 event->source.port, atomic, hop);
782#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
783 if (!snd_seq_client_is_ump(client) || client->ump_endpoint_port < 0)
784 return ret;
785 /* If it's an event from EP port (and with a UMP group),
786 * deliver to subscribers of the corresponding UMP group port, too.
787 * Or, if it's from non-EP port, deliver to subscribers of EP port, too.
788 */
789 if (event->source.port == client->ump_endpoint_port)
790 ret2 = __deliver_to_subscribers(client, event,
791 snd_seq_ump_group_port(event),
792 atomic, hop);
793 else
794 ret2 = __deliver_to_subscribers(client, event,
795 client->ump_endpoint_port,
796 atomic, hop);
797 if (ret2 < 0)
798 return ret2;
799#endif
800 return ret;
801}
802
803/* deliver an event to the destination port(s).
804 * if the event is to subscribers or broadcast, the event is dispatched
805 * to multiple targets.
806 *
807 * RETURN VALUE: n > 0 : the number of delivered events.
808 * n == 0 : the event was not passed to any client.
809 * n < 0 : error - event was not processed.
810 */
811static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
812 int atomic, int hop)
813{
814 int result;
815
816 hop++;
817 if (hop >= SNDRV_SEQ_MAX_HOPS) {
818 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
819 event->source.client, event->source.port,
820 event->dest.client, event->dest.port);
821 return -EMLINK;
822 }
823
824 if (snd_seq_ev_is_variable(event) &&
825 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
826 return -EINVAL;
827
828 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
829 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
830 result = deliver_to_subscribers(client, event, atomic, hop);
831 else
832 result = snd_seq_deliver_single_event(client, event, atomic, hop);
833
834 return result;
835}
836
837/*
838 * dispatch an event cell:
839 * This function is called only from queue check routines in timer
840 * interrupts or after enqueued.
841 * The event cell shall be released or re-queued in this function.
842 *
843 * RETURN VALUE: n > 0 : the number of delivered events.
844 * n == 0 : the event was not passed to any client.
845 * n < 0 : error - event was not processed.
846 */
847int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
848{
849 int result;
850
851 if (snd_BUG_ON(!cell))
852 return -EINVAL;
853
854 struct snd_seq_client *client __free(snd_seq_client) =
855 snd_seq_client_use_ptr(cell->event.source.client);
856 if (client == NULL) {
857 snd_seq_cell_free(cell); /* release this cell */
858 return -EINVAL;
859 }
860
861 if (!snd_seq_ev_is_ump(&cell->event) &&
862 cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
863 /* NOTE event:
864 * the event cell is re-used as a NOTE-OFF event and
865 * enqueued again.
866 */
867 struct snd_seq_event tmpev, *ev;
868
869 /* reserve this event to enqueue note-off later */
870 tmpev = cell->event;
871 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
872 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
873
874 /*
875 * This was originally a note event. We now re-use the
876 * cell for the note-off event.
877 */
878
879 ev = &cell->event;
880 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
881 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
882
883 /* add the duration time */
884 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
885 case SNDRV_SEQ_TIME_STAMP_TICK:
886 cell->event.time.tick += ev->data.note.duration;
887 break;
888 case SNDRV_SEQ_TIME_STAMP_REAL:
889 /* unit for duration is ms */
890 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
891 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
892 ev->time.time.tv_nsec / 1000000000;
893 ev->time.time.tv_nsec %= 1000000000;
894 break;
895 }
896 ev->data.note.velocity = ev->data.note.off_velocity;
897
898 /* Now queue this cell as the note off event */
899 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
900 snd_seq_cell_free(cell); /* release this cell */
901
902 } else {
903 /* Normal events:
904 * event cell is freed after processing the event
905 */
906
907 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
908 snd_seq_cell_free(cell);
909 }
910
911 return result;
912}
913
914
915/* Allocate a cell from client pool and enqueue it to queue:
916 * if pool is empty and blocking is TRUE, sleep until a new cell is
917 * available.
918 */
919static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
920 struct snd_seq_event *event,
921 struct file *file, int blocking,
922 int atomic, int hop,
923 struct mutex *mutexp)
924{
925 struct snd_seq_event_cell *cell;
926 int err;
927
928 /* special queue values - force direct passing */
929 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
930 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
931 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
932 } else if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
933 /* check presence of source port */
934 struct snd_seq_client_port *src_port __free(snd_seq_port) =
935 snd_seq_port_use_ptr(client, event->source.port);
936 if (!src_port)
937 return -EINVAL;
938 }
939
940 /* direct event processing without enqueued */
941 if (snd_seq_ev_is_direct(event)) {
942 if (!snd_seq_ev_is_ump(event) &&
943 event->type == SNDRV_SEQ_EVENT_NOTE)
944 return -EINVAL; /* this event must be enqueued! */
945 return snd_seq_deliver_event(client, event, atomic, hop);
946 }
947
948 /* Not direct, normal queuing */
949 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
950 return -EINVAL; /* invalid queue */
951 if (! snd_seq_write_pool_allocated(client))
952 return -ENXIO; /* queue is not allocated */
953
954 /* allocate an event cell */
955 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
956 file, mutexp);
957 if (err < 0)
958 return err;
959
960 /* we got a cell. enqueue it. */
961 err = snd_seq_enqueue_event(cell, atomic, hop);
962 if (err < 0) {
963 snd_seq_cell_free(cell);
964 return err;
965 }
966
967 return 0;
968}
969
970
971/*
972 * check validity of event type and data length.
973 * return non-zero if invalid.
974 */
975static int check_event_type_and_length(struct snd_seq_event *ev)
976{
977 switch (snd_seq_ev_length_type(ev)) {
978 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
979 if (snd_seq_ev_is_variable_type(ev))
980 return -EINVAL;
981 break;
982 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
983 if (! snd_seq_ev_is_variable_type(ev) ||
984 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
985 return -EINVAL;
986 break;
987 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
988 if (! snd_seq_ev_is_direct(ev))
989 return -EINVAL;
990 break;
991 }
992 return 0;
993}
994
995
996/* handle write() */
997/* possible error values:
998 * -ENXIO invalid client or file open mode
999 * -ENOMEM malloc failed
1000 * -EFAULT seg. fault during copy from user space
1001 * -EINVAL invalid event
1002 * -EAGAIN no space in output pool
1003 * -EINTR interrupts while sleep
1004 * -EMLINK too many hops
1005 * others depends on return value from driver callback
1006 */
1007static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1008 size_t count, loff_t *offset)
1009{
1010 struct snd_seq_client *client = file->private_data;
1011 int written = 0, len;
1012 int err, handled;
1013 union __snd_seq_event __event;
1014 struct snd_seq_event *ev = &__event.legacy;
1015
1016 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1017 return -ENXIO;
1018
1019 /* check client structures are in place */
1020 if (snd_BUG_ON(!client))
1021 return -ENXIO;
1022
1023 if (!client->accept_output || client->pool == NULL)
1024 return -ENXIO;
1025
1026 repeat:
1027 handled = 0;
1028 /* allocate the pool now if the pool is not allocated yet */
1029 mutex_lock(&client->ioctl_mutex);
1030 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1031 err = snd_seq_pool_init(client->pool);
1032 if (err < 0)
1033 goto out;
1034 }
1035
1036 /* only process whole events */
1037 err = -EINVAL;
1038 while (count >= sizeof(struct snd_seq_event)) {
1039 /* Read in the event header from the user */
1040 len = sizeof(struct snd_seq_event);
1041 if (copy_from_user(ev, buf, len)) {
1042 err = -EFAULT;
1043 break;
1044 }
1045 /* read in the rest bytes for UMP events */
1046 if (snd_seq_ev_is_ump(ev)) {
1047 if (count < sizeof(struct snd_seq_ump_event))
1048 break;
1049 if (copy_from_user((char *)ev + len, buf + len,
1050 sizeof(struct snd_seq_ump_event) - len)) {
1051 err = -EFAULT;
1052 break;
1053 }
1054 len = sizeof(struct snd_seq_ump_event);
1055 }
1056
1057 ev->source.client = client->number; /* fill in client number */
1058 /* Check for extension data length */
1059 if (check_event_type_and_length(ev)) {
1060 err = -EINVAL;
1061 break;
1062 }
1063
1064 if (!event_is_compatible(client, ev)) {
1065 err = -EINVAL;
1066 break;
1067 }
1068
1069 /* check for special events */
1070 if (!snd_seq_ev_is_ump(ev)) {
1071 if (ev->type == SNDRV_SEQ_EVENT_NONE)
1072 goto __skip_event;
1073 else if (snd_seq_ev_is_reserved(ev)) {
1074 err = -EINVAL;
1075 break;
1076 }
1077 }
1078
1079 if (snd_seq_ev_is_variable(ev)) {
1080 int extlen = ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1081 if ((size_t)(extlen + len) > count) {
1082 /* back out, will get an error this time or next */
1083 err = -EINVAL;
1084 break;
1085 }
1086 /* set user space pointer */
1087 ev->data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1088 ev->data.ext.ptr = (char __force *)buf + len;
1089 len += extlen; /* increment data length */
1090 } else {
1091#ifdef CONFIG_COMPAT
1092 if (client->convert32 && snd_seq_ev_is_varusr(ev))
1093 ev->data.ext.ptr =
1094 (void __force *)compat_ptr(ev->data.raw32.d[1]);
1095#endif
1096 }
1097
1098 /* ok, enqueue it */
1099 err = snd_seq_client_enqueue_event(client, ev, file,
1100 !(file->f_flags & O_NONBLOCK),
1101 0, 0, &client->ioctl_mutex);
1102 if (err < 0)
1103 break;
1104 handled++;
1105
1106 __skip_event:
1107 /* Update pointers and counts */
1108 count -= len;
1109 buf += len;
1110 written += len;
1111
1112 /* let's have a coffee break if too many events are queued */
1113 if (++handled >= 200) {
1114 mutex_unlock(&client->ioctl_mutex);
1115 goto repeat;
1116 }
1117 }
1118
1119 out:
1120 mutex_unlock(&client->ioctl_mutex);
1121 return written ? written : err;
1122}
1123
1124
1125/*
1126 * handle polling
1127 */
1128static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1129{
1130 struct snd_seq_client *client = file->private_data;
1131 __poll_t mask = 0;
1132
1133 /* check client structures are in place */
1134 if (snd_BUG_ON(!client))
1135 return EPOLLERR;
1136
1137 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1138 client->data.user.fifo) {
1139
1140 /* check if data is available in the outqueue */
1141 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1142 mask |= EPOLLIN | EPOLLRDNORM;
1143 }
1144
1145 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1146
1147 /* check if data is available in the pool */
1148 if (snd_seq_pool_poll_wait(client->pool, file, wait))
1149 mask |= EPOLLOUT | EPOLLWRNORM;
1150 }
1151
1152 return mask;
1153}
1154
1155
1156/*-----------------------------------------------------*/
1157
1158static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1159{
1160 int *pversion = arg;
1161
1162 *pversion = SNDRV_SEQ_VERSION;
1163 return 0;
1164}
1165
1166static int snd_seq_ioctl_user_pversion(struct snd_seq_client *client, void *arg)
1167{
1168 client->user_pversion = *(unsigned int *)arg;
1169 return 0;
1170}
1171
1172static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1173{
1174 int *client_id = arg;
1175
1176 *client_id = client->number;
1177 return 0;
1178}
1179
1180/* SYSTEM_INFO ioctl() */
1181static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1182{
1183 struct snd_seq_system_info *info = arg;
1184
1185 memset(info, 0, sizeof(*info));
1186 /* fill the info fields */
1187 info->queues = SNDRV_SEQ_MAX_QUEUES;
1188 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1189 info->ports = SNDRV_SEQ_MAX_PORTS;
1190 info->channels = 256; /* fixed limit */
1191 info->cur_clients = client_usage.cur;
1192 info->cur_queues = snd_seq_queue_get_cur_queues();
1193
1194 return 0;
1195}
1196
1197
1198/* RUNNING_MODE ioctl() */
1199static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1200{
1201 struct snd_seq_running_info *info = arg;
1202 /* requested client number */
1203 struct snd_seq_client *cptr __free(snd_seq_client) =
1204 client_load_and_use_ptr(info->client);
1205
1206 if (cptr == NULL)
1207 return -ENOENT; /* don't change !!! */
1208
1209#ifdef SNDRV_BIG_ENDIAN
1210 if (!info->big_endian)
1211 return -EINVAL;
1212#else
1213 if (info->big_endian)
1214 return -EINVAL;
1215#endif
1216 if (info->cpu_mode > sizeof(long))
1217 return -EINVAL;
1218 cptr->convert32 = (info->cpu_mode < sizeof(long));
1219 return 0;
1220}
1221
1222/* CLIENT_INFO ioctl() */
1223static void get_client_info(struct snd_seq_client *cptr,
1224 struct snd_seq_client_info *info)
1225{
1226 info->client = cptr->number;
1227
1228 /* fill the info fields */
1229 info->type = cptr->type;
1230 strscpy(info->name, cptr->name);
1231 info->filter = cptr->filter;
1232 info->event_lost = cptr->event_lost;
1233 memcpy(info->event_filter, cptr->event_filter, 32);
1234 info->group_filter = cptr->group_filter;
1235 info->num_ports = cptr->num_ports;
1236
1237 if (cptr->type == USER_CLIENT)
1238 info->pid = pid_vnr(cptr->data.user.owner);
1239 else
1240 info->pid = -1;
1241
1242 if (cptr->type == KERNEL_CLIENT)
1243 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1244 else
1245 info->card = -1;
1246
1247 info->midi_version = cptr->midi_version;
1248 memset(info->reserved, 0, sizeof(info->reserved));
1249}
1250
1251static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1252 void *arg)
1253{
1254 struct snd_seq_client_info *client_info = arg;
1255 /* requested client number */
1256 struct snd_seq_client *cptr __free(snd_seq_client) =
1257 client_load_and_use_ptr(client_info->client);
1258
1259 if (cptr == NULL)
1260 return -ENOENT; /* don't change !!! */
1261
1262 get_client_info(cptr, client_info);
1263 return 0;
1264}
1265
1266
1267/* CLIENT_INFO ioctl() */
1268static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1269 void *arg)
1270{
1271 struct snd_seq_client_info *client_info = arg;
1272
1273 /* it is not allowed to set the info fields for an another client */
1274 if (client->number != client_info->client)
1275 return -EPERM;
1276 /* also client type must be set now */
1277 if (client->type != client_info->type)
1278 return -EINVAL;
1279
1280 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) {
1281 /* check validity of midi_version field */
1282 if (client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0)
1283 return -EINVAL;
1284
1285 /* check if UMP is supported in kernel */
1286 if (!IS_ENABLED(CONFIG_SND_SEQ_UMP) &&
1287 client_info->midi_version > 0)
1288 return -EINVAL;
1289 }
1290
1291 /* fill the info fields */
1292 if (client_info->name[0])
1293 strscpy(client->name, client_info->name, sizeof(client->name));
1294
1295 client->filter = client_info->filter;
1296 client->event_lost = client_info->event_lost;
1297 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3))
1298 client->midi_version = client_info->midi_version;
1299 memcpy(client->event_filter, client_info->event_filter, 32);
1300 client->group_filter = client_info->group_filter & SND_SEQ_GROUP_FILTER_MASK;
1301
1302 /* notify the change */
1303 snd_seq_system_client_ev_client_change(client->number);
1304
1305 return 0;
1306}
1307
1308
1309/*
1310 * CREATE PORT ioctl()
1311 */
1312static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1313{
1314 struct snd_seq_port_info *info = arg;
1315 struct snd_seq_client_port *port;
1316 struct snd_seq_port_callback *callback;
1317 int port_idx, err;
1318
1319 /* it is not allowed to create the port for an another client */
1320 if (info->addr.client != client->number)
1321 return -EPERM;
1322 if (client->type == USER_CLIENT && info->kernel)
1323 return -EINVAL;
1324 if ((info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) &&
1325 client->ump_endpoint_port >= 0)
1326 return -EBUSY;
1327
1328 if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT)
1329 port_idx = info->addr.port;
1330 else
1331 port_idx = -1;
1332 if (port_idx >= SNDRV_SEQ_ADDRESS_UNKNOWN)
1333 return -EINVAL;
1334 err = snd_seq_create_port(client, &port);
1335 if (err < 0)
1336 return err;
1337
1338 if (client->type == KERNEL_CLIENT) {
1339 callback = info->kernel;
1340 if (callback) {
1341 if (callback->owner)
1342 port->owner = callback->owner;
1343 port->private_data = callback->private_data;
1344 port->private_free = callback->private_free;
1345 port->event_input = callback->event_input;
1346 port->c_src.open = callback->subscribe;
1347 port->c_src.close = callback->unsubscribe;
1348 port->c_dest.open = callback->use;
1349 port->c_dest.close = callback->unuse;
1350 }
1351 }
1352
1353 snd_seq_set_port_info(port, info);
1354 err = snd_seq_insert_port(client, port_idx, port);
1355 if (err < 0) {
1356 kfree(port);
1357 return err;
1358 }
1359 info->addr = port->addr;
1360 if (info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT)
1361 client->ump_endpoint_port = port->addr.port;
1362 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1363 snd_seq_port_unlock(port);
1364
1365 return 0;
1366}
1367
1368/*
1369 * DELETE PORT ioctl()
1370 */
1371static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1372{
1373 struct snd_seq_port_info *info = arg;
1374 int err;
1375
1376 /* it is not allowed to remove the port for an another client */
1377 if (info->addr.client != client->number)
1378 return -EPERM;
1379
1380 err = snd_seq_delete_port(client, info->addr.port);
1381 if (err >= 0) {
1382 if (client->ump_endpoint_port == info->addr.port)
1383 client->ump_endpoint_port = -1;
1384 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1385 }
1386 return err;
1387}
1388
1389
1390/*
1391 * GET_PORT_INFO ioctl() (on any client)
1392 */
1393static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1394{
1395 struct snd_seq_port_info *info = arg;
1396
1397 struct snd_seq_client *cptr __free(snd_seq_client) =
1398 client_load_and_use_ptr(info->addr.client);
1399 if (cptr == NULL)
1400 return -ENXIO;
1401
1402 struct snd_seq_client_port *port __free(snd_seq_port) =
1403 snd_seq_port_use_ptr(cptr, info->addr.port);
1404 if (port == NULL)
1405 return -ENOENT; /* don't change */
1406
1407 /* get port info */
1408 snd_seq_get_port_info(port, info);
1409 return 0;
1410}
1411
1412
1413/*
1414 * SET_PORT_INFO ioctl() (only ports on this/own client)
1415 */
1416static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1417{
1418 struct snd_seq_port_info *info = arg;
1419
1420 if (info->addr.client != client->number) /* only set our own ports ! */
1421 return -EPERM;
1422
1423 struct snd_seq_client_port *port __free(snd_seq_port) =
1424 snd_seq_port_use_ptr(client, info->addr.port);
1425 if (port) {
1426 snd_seq_set_port_info(port, info);
1427 /* notify the change */
1428 snd_seq_system_client_ev_port_change(info->addr.client,
1429 info->addr.port);
1430 }
1431 return 0;
1432}
1433
1434
1435/*
1436 * port subscription (connection)
1437 */
1438#define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1439#define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1440
1441static int check_subscription_permission(struct snd_seq_client *client,
1442 struct snd_seq_client_port *sport,
1443 struct snd_seq_client_port *dport,
1444 struct snd_seq_port_subscribe *subs)
1445{
1446 if (client->number != subs->sender.client &&
1447 client->number != subs->dest.client) {
1448 /* connection by third client - check export permission */
1449 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1450 return -EPERM;
1451 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1452 return -EPERM;
1453 }
1454
1455 /* check read permission */
1456 /* if sender or receiver is the subscribing client itself,
1457 * no permission check is necessary
1458 */
1459 if (client->number != subs->sender.client) {
1460 if (! check_port_perm(sport, PERM_RD))
1461 return -EPERM;
1462 }
1463 /* check write permission */
1464 if (client->number != subs->dest.client) {
1465 if (! check_port_perm(dport, PERM_WR))
1466 return -EPERM;
1467 }
1468 return 0;
1469}
1470
1471/*
1472 * send an subscription notify event to user client:
1473 * client must be user client.
1474 */
1475int snd_seq_client_notify_subscription(int client, int port,
1476 struct snd_seq_port_subscribe *info,
1477 int evtype)
1478{
1479 struct snd_seq_event event;
1480
1481 memset(&event, 0, sizeof(event));
1482 event.type = evtype;
1483 event.data.connect.dest = info->dest;
1484 event.data.connect.sender = info->sender;
1485
1486 return snd_seq_system_notify(client, port, &event, false); /* non-atomic */
1487}
1488
1489
1490/*
1491 * add to port's subscription list IOCTL interface
1492 */
1493static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1494 void *arg)
1495{
1496 struct snd_seq_port_subscribe *subs = arg;
1497 int result;
1498
1499 struct snd_seq_client *receiver __free(snd_seq_client) =
1500 client_load_and_use_ptr(subs->dest.client);
1501 if (!receiver)
1502 return -EINVAL;
1503 struct snd_seq_client *sender __free(snd_seq_client) =
1504 client_load_and_use_ptr(subs->sender.client);
1505 if (!sender)
1506 return -EINVAL;
1507 struct snd_seq_client_port *sport __free(snd_seq_port) =
1508 snd_seq_port_use_ptr(sender, subs->sender.port);
1509 if (!sport)
1510 return -EINVAL;
1511 struct snd_seq_client_port *dport __free(snd_seq_port) =
1512 snd_seq_port_use_ptr(receiver, subs->dest.port);
1513 if (!dport)
1514 return -EINVAL;
1515
1516 result = check_subscription_permission(client, sport, dport, subs);
1517 if (result < 0)
1518 return result;
1519
1520 /* connect them */
1521 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1522 if (! result) /* broadcast announce */
1523 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1524 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1525 return result;
1526}
1527
1528
1529/*
1530 * remove from port's subscription list
1531 */
1532static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1533 void *arg)
1534{
1535 struct snd_seq_port_subscribe *subs = arg;
1536 int result;
1537
1538 struct snd_seq_client *receiver __free(snd_seq_client) =
1539 snd_seq_client_use_ptr(subs->dest.client);
1540 if (!receiver)
1541 return -ENXIO;
1542 struct snd_seq_client *sender __free(snd_seq_client) =
1543 snd_seq_client_use_ptr(subs->sender.client);
1544 if (!sender)
1545 return -ENXIO;
1546 struct snd_seq_client_port *sport __free(snd_seq_port) =
1547 snd_seq_port_use_ptr(sender, subs->sender.port);
1548 if (!sport)
1549 return -ENXIO;
1550 struct snd_seq_client_port *dport __free(snd_seq_port) =
1551 snd_seq_port_use_ptr(receiver, subs->dest.port);
1552 if (!dport)
1553 return -ENXIO;
1554
1555 result = check_subscription_permission(client, sport, dport, subs);
1556 if (result < 0)
1557 return result;
1558
1559 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1560 if (! result) /* broadcast announce */
1561 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1562 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1563 return result;
1564}
1565
1566
1567/* CREATE_QUEUE ioctl() */
1568static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1569{
1570 struct snd_seq_queue_info *info = arg;
1571 struct snd_seq_queue *q __free(snd_seq_queue) =
1572 snd_seq_queue_alloc(client->number, info->locked, info->flags);
1573
1574 if (IS_ERR(q))
1575 return PTR_ERR(q);
1576
1577 info->queue = q->queue;
1578 info->locked = q->locked;
1579 info->owner = q->owner;
1580
1581 /* set queue name */
1582 if (!info->name[0])
1583 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1584 strscpy(q->name, info->name, sizeof(q->name));
1585
1586 return 0;
1587}
1588
1589/* DELETE_QUEUE ioctl() */
1590static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1591{
1592 struct snd_seq_queue_info *info = arg;
1593
1594 return snd_seq_queue_delete(client->number, info->queue);
1595}
1596
1597/* GET_QUEUE_INFO ioctl() */
1598static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1599 void *arg)
1600{
1601 struct snd_seq_queue_info *info = arg;
1602 struct snd_seq_queue *q __free(snd_seq_queue) =
1603 queueptr(info->queue);
1604
1605 if (q == NULL)
1606 return -EINVAL;
1607
1608 memset(info, 0, sizeof(*info));
1609 info->queue = q->queue;
1610 info->owner = q->owner;
1611 info->locked = q->locked;
1612 strscpy(info->name, q->name, sizeof(info->name));
1613
1614 return 0;
1615}
1616
1617/* SET_QUEUE_INFO ioctl() */
1618static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1619 void *arg)
1620{
1621 struct snd_seq_queue_info *info = arg;
1622
1623 if (info->owner != client->number)
1624 return -EINVAL;
1625
1626 /* change owner/locked permission */
1627 if (snd_seq_queue_check_access(info->queue, client->number)) {
1628 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1629 return -EPERM;
1630 if (info->locked)
1631 snd_seq_queue_use(info->queue, client->number, 1);
1632 } else {
1633 return -EPERM;
1634 }
1635
1636 struct snd_seq_queue *q __free(snd_seq_queue) =
1637 queueptr(info->queue);
1638 if (! q)
1639 return -EINVAL;
1640 if (q->owner != client->number)
1641 return -EPERM;
1642 strscpy(q->name, info->name, sizeof(q->name));
1643
1644 return 0;
1645}
1646
1647/* GET_NAMED_QUEUE ioctl() */
1648static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1649 void *arg)
1650{
1651 struct snd_seq_queue_info *info = arg;
1652 struct snd_seq_queue *q __free(snd_seq_queue) =
1653 snd_seq_queue_find_name(info->name);
1654
1655 if (q == NULL)
1656 return -EINVAL;
1657 info->queue = q->queue;
1658 info->owner = q->owner;
1659 info->locked = q->locked;
1660
1661 return 0;
1662}
1663
1664/* GET_QUEUE_STATUS ioctl() */
1665static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1666 void *arg)
1667{
1668 struct snd_seq_queue_status *status = arg;
1669 struct snd_seq_timer *tmr;
1670 struct snd_seq_queue *queue __free(snd_seq_queue) =
1671 queueptr(status->queue);
1672
1673 if (queue == NULL)
1674 return -EINVAL;
1675 memset(status, 0, sizeof(*status));
1676 status->queue = queue->queue;
1677
1678 tmr = queue->timer;
1679 status->events = queue->tickq->cells + queue->timeq->cells;
1680
1681 status->time = snd_seq_timer_get_cur_time(tmr, true);
1682 status->tick = snd_seq_timer_get_cur_tick(tmr);
1683
1684 status->running = tmr->running;
1685
1686 status->flags = queue->flags;
1687
1688 return 0;
1689}
1690
1691
1692/* GET_QUEUE_TEMPO ioctl() */
1693static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1694 void *arg)
1695{
1696 struct snd_seq_queue_tempo *tempo = arg;
1697 struct snd_seq_timer *tmr;
1698 struct snd_seq_queue *queue __free(snd_seq_queue) =
1699 queueptr(tempo->queue);
1700
1701 if (queue == NULL)
1702 return -EINVAL;
1703 memset(tempo, 0, sizeof(*tempo));
1704 tempo->queue = queue->queue;
1705
1706 tmr = queue->timer;
1707
1708 tempo->tempo = tmr->tempo;
1709 tempo->ppq = tmr->ppq;
1710 tempo->skew_value = tmr->skew;
1711 tempo->skew_base = tmr->skew_base;
1712 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 4))
1713 tempo->tempo_base = tmr->tempo_base;
1714
1715 return 0;
1716}
1717
1718
1719/* SET_QUEUE_TEMPO ioctl() */
1720int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1721{
1722 if (!snd_seq_queue_check_access(tempo->queue, client))
1723 return -EPERM;
1724 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1725}
1726EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1727
1728static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1729 void *arg)
1730{
1731 struct snd_seq_queue_tempo *tempo = arg;
1732 int result;
1733
1734 if (client->user_pversion < SNDRV_PROTOCOL_VERSION(1, 0, 4))
1735 tempo->tempo_base = 0;
1736 result = snd_seq_set_queue_tempo(client->number, tempo);
1737 return result < 0 ? result : 0;
1738}
1739
1740
1741/* GET_QUEUE_TIMER ioctl() */
1742static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1743 void *arg)
1744{
1745 struct snd_seq_queue_timer *timer = arg;
1746 struct snd_seq_timer *tmr;
1747 struct snd_seq_queue *queue __free(snd_seq_queue) =
1748 queueptr(timer->queue);
1749
1750 if (queue == NULL)
1751 return -EINVAL;
1752
1753 guard(mutex)(&queue->timer_mutex);
1754 tmr = queue->timer;
1755 memset(timer, 0, sizeof(*timer));
1756 timer->queue = queue->queue;
1757
1758 timer->type = tmr->type;
1759 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1760 timer->u.alsa.id = tmr->alsa_id;
1761 timer->u.alsa.resolution = tmr->preferred_resolution;
1762 }
1763
1764 return 0;
1765}
1766
1767
1768/* SET_QUEUE_TIMER ioctl() */
1769static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1770 void *arg)
1771{
1772 struct snd_seq_queue_timer *timer = arg;
1773 int result = 0;
1774
1775 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1776 return -EINVAL;
1777
1778 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1779 struct snd_seq_timer *tmr;
1780 struct snd_seq_queue *q __free(snd_seq_queue) =
1781 queueptr(timer->queue);
1782
1783 if (q == NULL)
1784 return -ENXIO;
1785 guard(mutex)(&q->timer_mutex);
1786 tmr = q->timer;
1787 snd_seq_queue_timer_close(timer->queue);
1788 tmr->type = timer->type;
1789 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1790 tmr->alsa_id = timer->u.alsa.id;
1791 tmr->preferred_resolution = timer->u.alsa.resolution;
1792 }
1793 result = snd_seq_queue_timer_open(timer->queue);
1794 } else {
1795 return -EPERM;
1796 }
1797
1798 return result;
1799}
1800
1801
1802/* GET_QUEUE_CLIENT ioctl() */
1803static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1804 void *arg)
1805{
1806 struct snd_seq_queue_client *info = arg;
1807 int used;
1808
1809 used = snd_seq_queue_is_used(info->queue, client->number);
1810 if (used < 0)
1811 return -EINVAL;
1812 info->used = used;
1813 info->client = client->number;
1814
1815 return 0;
1816}
1817
1818
1819/* SET_QUEUE_CLIENT ioctl() */
1820static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1821 void *arg)
1822{
1823 struct snd_seq_queue_client *info = arg;
1824 int err;
1825
1826 if (info->used >= 0) {
1827 err = snd_seq_queue_use(info->queue, client->number, info->used);
1828 if (err < 0)
1829 return err;
1830 }
1831
1832 return snd_seq_ioctl_get_queue_client(client, arg);
1833}
1834
1835
1836/* GET_CLIENT_POOL ioctl() */
1837static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1838 void *arg)
1839{
1840 struct snd_seq_client_pool *info = arg;
1841 struct snd_seq_client *cptr __free(snd_seq_client) =
1842 client_load_and_use_ptr(info->client);
1843
1844 if (cptr == NULL)
1845 return -ENOENT;
1846 memset(info, 0, sizeof(*info));
1847 info->client = cptr->number;
1848 info->output_pool = cptr->pool->size;
1849 info->output_room = cptr->pool->room;
1850 info->output_free = info->output_pool;
1851 info->output_free = snd_seq_unused_cells(cptr->pool);
1852 if (cptr->type == USER_CLIENT) {
1853 info->input_pool = cptr->data.user.fifo_pool_size;
1854 info->input_free = info->input_pool;
1855 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
1856 } else {
1857 info->input_pool = 0;
1858 info->input_free = 0;
1859 }
1860
1861 return 0;
1862}
1863
1864/* SET_CLIENT_POOL ioctl() */
1865static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1866 void *arg)
1867{
1868 struct snd_seq_client_pool *info = arg;
1869 int rc;
1870
1871 if (client->number != info->client)
1872 return -EINVAL; /* can't change other clients */
1873
1874 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1875 (! snd_seq_write_pool_allocated(client) ||
1876 info->output_pool != client->pool->size)) {
1877 if (snd_seq_write_pool_allocated(client)) {
1878 /* is the pool in use? */
1879 if (atomic_read(&client->pool->counter))
1880 return -EBUSY;
1881 /* remove all existing cells */
1882 snd_seq_pool_mark_closing(client->pool);
1883 snd_seq_pool_done(client->pool);
1884 }
1885 client->pool->size = info->output_pool;
1886 rc = snd_seq_pool_init(client->pool);
1887 if (rc < 0)
1888 return rc;
1889 }
1890 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1891 info->input_pool >= 1 &&
1892 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1893 info->input_pool != client->data.user.fifo_pool_size) {
1894 /* change pool size */
1895 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1896 if (rc < 0)
1897 return rc;
1898 client->data.user.fifo_pool_size = info->input_pool;
1899 }
1900 if (info->output_room >= 1 &&
1901 info->output_room <= client->pool->size) {
1902 client->pool->room = info->output_room;
1903 }
1904
1905 return snd_seq_ioctl_get_client_pool(client, arg);
1906}
1907
1908
1909/* REMOVE_EVENTS ioctl() */
1910static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1911 void *arg)
1912{
1913 struct snd_seq_remove_events *info = arg;
1914
1915 /*
1916 * Input mostly not implemented XXX.
1917 */
1918 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1919 /*
1920 * No restrictions so for a user client we can clear
1921 * the whole fifo
1922 */
1923 if (client->type == USER_CLIENT && client->data.user.fifo)
1924 snd_seq_fifo_clear(client->data.user.fifo);
1925 }
1926
1927 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1928 snd_seq_queue_remove_cells(client->number, info);
1929
1930 return 0;
1931}
1932
1933
1934/*
1935 * get subscription info
1936 */
1937static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1938 void *arg)
1939{
1940 struct snd_seq_port_subscribe *subs = arg;
1941
1942 struct snd_seq_client *sender __free(snd_seq_client) =
1943 client_load_and_use_ptr(subs->sender.client);
1944 if (!sender)
1945 return -EINVAL;
1946 struct snd_seq_client_port *sport __free(snd_seq_port) =
1947 snd_seq_port_use_ptr(sender, subs->sender.port);
1948 if (!sport)
1949 return -EINVAL;
1950 return snd_seq_port_get_subscription(&sport->c_src, &subs->dest, subs);
1951}
1952
1953
1954/*
1955 * get subscription info - check only its presence
1956 */
1957static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1958{
1959 struct snd_seq_query_subs *subs = arg;
1960 struct snd_seq_port_subs_info *group;
1961 struct hlist_node *p;
1962 int i;
1963
1964 struct snd_seq_client *cptr __free(snd_seq_client) =
1965 client_load_and_use_ptr(subs->root.client);
1966 if (!cptr)
1967 return -ENXIO;
1968 struct snd_seq_client_port *port __free(snd_seq_port) =
1969 snd_seq_port_use_ptr(cptr, subs->root.port);
1970 if (!port)
1971 return -ENXIO;
1972
1973 switch (subs->type) {
1974 case SNDRV_SEQ_QUERY_SUBS_READ:
1975 group = &port->c_src;
1976 break;
1977 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1978 group = &port->c_dest;
1979 break;
1980 default:
1981 return -ENXIO;
1982 }
1983
1984 guard(rwsem_read)(&group->list_mutex);
1985 /* search for the subscriber */
1986 subs->num_subs = group->count;
1987 i = 0;
1988 hlist_for_each(p, &group->list_head) {
1989 if (i++ == subs->index) {
1990 /* found! */
1991 struct snd_seq_subscribers *s;
1992 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1993 s = hlist_entry(p, struct snd_seq_subscribers, src_list);
1994 subs->addr = s->info.dest;
1995 } else {
1996 s = hlist_entry(p, struct snd_seq_subscribers, dest_list);
1997 subs->addr = s->info.sender;
1998 }
1999 subs->flags = s->info.flags;
2000 subs->queue = s->info.queue;
2001 return 0;
2002 }
2003 }
2004
2005 return -ENOENT;
2006}
2007
2008
2009/*
2010 * query next client
2011 */
2012static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2013 void *arg)
2014{
2015 struct snd_seq_client_info *info = arg;
2016
2017 /* search for next client */
2018 if (info->client < INT_MAX)
2019 info->client++;
2020 if (info->client < 0)
2021 info->client = 0;
2022 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2023 struct snd_seq_client *cptr __free(snd_seq_client) =
2024 client_load_and_use_ptr(info->client);
2025 if (cptr) {
2026 get_client_info(cptr, info);
2027 return 0; /* found */
2028 }
2029 }
2030 return -ENOENT;
2031}
2032
2033/*
2034 * query next port
2035 */
2036static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2037 void *arg)
2038{
2039 struct snd_seq_port_info *info = arg;
2040
2041 struct snd_seq_client *cptr __free(snd_seq_client) =
2042 client_load_and_use_ptr(info->addr.client);
2043 if (cptr == NULL)
2044 return -ENXIO;
2045
2046 /* search for next port */
2047 info->addr.port++;
2048 struct snd_seq_client_port *port __free(snd_seq_port) =
2049 snd_seq_port_query_nearest(cptr, info);
2050 if (port == NULL)
2051 return -ENOENT;
2052
2053 /* get port info */
2054 info->addr = port->addr;
2055 snd_seq_get_port_info(port, info);
2056
2057 return 0;
2058}
2059
2060#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
2061#define NUM_UMP_INFOS (SNDRV_UMP_MAX_BLOCKS + 1)
2062
2063static void free_ump_info(struct snd_seq_client *client)
2064{
2065 int i;
2066
2067 if (!client->ump_info)
2068 return;
2069 for (i = 0; i < NUM_UMP_INFOS; i++)
2070 kfree(client->ump_info[i]);
2071 kfree(client->ump_info);
2072 client->ump_info = NULL;
2073}
2074
2075static void terminate_ump_info_strings(void *p, int type)
2076{
2077 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) {
2078 struct snd_ump_endpoint_info *ep = p;
2079 ep->name[sizeof(ep->name) - 1] = 0;
2080 } else {
2081 struct snd_ump_block_info *bp = p;
2082 bp->name[sizeof(bp->name) - 1] = 0;
2083 }
2084}
2085
2086#ifdef CONFIG_SND_PROC_FS
2087static void dump_ump_info(struct snd_info_buffer *buffer,
2088 struct snd_seq_client *client)
2089{
2090 struct snd_ump_endpoint_info *ep;
2091 struct snd_ump_block_info *bp;
2092 int i;
2093
2094 if (!client->ump_info)
2095 return;
2096 ep = client->ump_info[SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT];
2097 if (ep && *ep->name)
2098 snd_iprintf(buffer, " UMP Endpoint: \"%s\"\n", ep->name);
2099 for (i = 0; i < SNDRV_UMP_MAX_BLOCKS; i++) {
2100 bp = client->ump_info[i + 1];
2101 if (bp && *bp->name) {
2102 snd_iprintf(buffer, " UMP Block %d: \"%s\" [%s]\n",
2103 i, bp->name,
2104 bp->active ? "Active" : "Inactive");
2105 snd_iprintf(buffer, " Groups: %d-%d\n",
2106 bp->first_group + 1,
2107 bp->first_group + bp->num_groups);
2108 }
2109 }
2110}
2111#endif
2112
2113/* UMP-specific ioctls -- called directly without data copy */
2114static int snd_seq_ioctl_client_ump_info(struct snd_seq_client *caller,
2115 unsigned int cmd,
2116 unsigned long arg)
2117{
2118 struct snd_seq_client_ump_info __user *argp =
2119 (struct snd_seq_client_ump_info __user *)arg;
2120 int client, type, err = 0;
2121 size_t size;
2122 void *p;
2123
2124 if (get_user(client, &argp->client) || get_user(type, &argp->type))
2125 return -EFAULT;
2126 if (cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO &&
2127 caller->number != client)
2128 return -EPERM;
2129 if (type < 0 || type >= NUM_UMP_INFOS)
2130 return -EINVAL;
2131 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT)
2132 size = sizeof(struct snd_ump_endpoint_info);
2133 else
2134 size = sizeof(struct snd_ump_block_info);
2135
2136 struct snd_seq_client *cptr __free(snd_seq_client) =
2137 client_load_and_use_ptr(client);
2138 if (!cptr)
2139 return -ENOENT;
2140
2141 scoped_guard(mutex, &cptr->ioctl_mutex) {
2142 if (!cptr->midi_version) {
2143 err = -EBADFD;
2144 break;
2145 }
2146
2147 if (cmd == SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO) {
2148 if (!cptr->ump_info)
2149 p = NULL;
2150 else
2151 p = cptr->ump_info[type];
2152 if (!p) {
2153 err = -ENODEV;
2154 break;
2155 }
2156 if (copy_to_user(argp->info, p, size)) {
2157 err = -EFAULT;
2158 break;
2159 }
2160 } else {
2161 if (cptr->type != USER_CLIENT) {
2162 err = -EBADFD;
2163 break;
2164 }
2165 if (!cptr->ump_info) {
2166 cptr->ump_info = kcalloc(NUM_UMP_INFOS,
2167 sizeof(void *), GFP_KERNEL);
2168 if (!cptr->ump_info) {
2169 err = -ENOMEM;
2170 break;
2171 }
2172 }
2173 p = memdup_user(argp->info, size);
2174 if (IS_ERR(p)) {
2175 err = PTR_ERR(p);
2176 break;
2177 }
2178 kfree(cptr->ump_info[type]);
2179 terminate_ump_info_strings(p, type);
2180 cptr->ump_info[type] = p;
2181 }
2182
2183 }
2184 if (!err && cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO) {
2185 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT)
2186 snd_seq_system_ump_notify(client, 0,
2187 SNDRV_SEQ_EVENT_UMP_EP_CHANGE,
2188 false);
2189 else
2190 snd_seq_system_ump_notify(client, type - 1,
2191 SNDRV_SEQ_EVENT_UMP_BLOCK_CHANGE,
2192 false);
2193 }
2194 return err;
2195}
2196#endif
2197
2198/* -------------------------------------------------------- */
2199
2200static const struct ioctl_handler {
2201 unsigned int cmd;
2202 int (*func)(struct snd_seq_client *client, void *arg);
2203} ioctl_handlers[] = {
2204 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2205 { SNDRV_SEQ_IOCTL_USER_PVERSION, snd_seq_ioctl_user_pversion },
2206 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2207 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2208 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2209 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2210 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2211 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2212 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2213 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2214 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2215 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2216 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2217 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2218 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2219 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2220 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2221 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2222 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2223 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2224 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2225 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2226 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2227 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2228 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2229 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2230 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2231 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2232 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2233 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2234 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2235 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2236 { 0, NULL },
2237};
2238
2239static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2240 unsigned long arg)
2241{
2242 struct snd_seq_client *client = file->private_data;
2243 /* To use kernel stack for ioctl data. */
2244 union {
2245 int pversion;
2246 int client_id;
2247 struct snd_seq_system_info system_info;
2248 struct snd_seq_running_info running_info;
2249 struct snd_seq_client_info client_info;
2250 struct snd_seq_port_info port_info;
2251 struct snd_seq_port_subscribe port_subscribe;
2252 struct snd_seq_queue_info queue_info;
2253 struct snd_seq_queue_status queue_status;
2254 struct snd_seq_queue_tempo tempo;
2255 struct snd_seq_queue_timer queue_timer;
2256 struct snd_seq_queue_client queue_client;
2257 struct snd_seq_client_pool client_pool;
2258 struct snd_seq_remove_events remove_events;
2259 struct snd_seq_query_subs query_subs;
2260 } buf;
2261 const struct ioctl_handler *handler;
2262 unsigned long size;
2263 int err;
2264
2265 if (snd_BUG_ON(!client))
2266 return -ENXIO;
2267
2268#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
2269 /* exception - handling large data */
2270 switch (cmd) {
2271 case SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO:
2272 case SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO:
2273 return snd_seq_ioctl_client_ump_info(client, cmd, arg);
2274 }
2275#endif
2276
2277 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2278 if (handler->cmd == cmd)
2279 break;
2280 }
2281 if (handler->cmd == 0)
2282 return -ENOTTY;
2283
2284 memset(&buf, 0, sizeof(buf));
2285
2286 /*
2287 * All of ioctl commands for ALSA sequencer get an argument of size
2288 * within 13 bits. We can safely pick up the size from the command.
2289 */
2290 size = _IOC_SIZE(handler->cmd);
2291 if (handler->cmd & IOC_IN) {
2292 if (copy_from_user(&buf, (const void __user *)arg, size))
2293 return -EFAULT;
2294 }
2295
2296 scoped_guard(mutex, &client->ioctl_mutex) {
2297 err = handler->func(client, &buf);
2298 }
2299 if (err >= 0) {
2300 /* Some commands includes a bug in 'dir' field. */
2301 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2302 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2303 (handler->cmd & IOC_OUT))
2304 if (copy_to_user((void __user *)arg, &buf, size))
2305 return -EFAULT;
2306 }
2307
2308 return err;
2309}
2310
2311#ifdef CONFIG_COMPAT
2312#include "seq_compat.c"
2313#else
2314#define snd_seq_ioctl_compat NULL
2315#endif
2316
2317/* -------------------------------------------------------- */
2318
2319
2320/* exported to kernel modules */
2321int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2322 const char *name_fmt, ...)
2323{
2324 struct snd_seq_client *client;
2325 va_list args;
2326
2327 if (snd_BUG_ON(in_interrupt()))
2328 return -EBUSY;
2329
2330 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2331 return -EINVAL;
2332 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2333 return -EINVAL;
2334
2335 scoped_guard(mutex, &register_mutex) {
2336
2337 if (card) {
2338 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2339 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2340 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2341 client_index = -1;
2342 }
2343
2344 /* empty write queue as default */
2345 client = seq_create_client1(client_index, 0);
2346 if (client == NULL)
2347 return -EBUSY; /* failure code */
2348 usage_alloc(&client_usage, 1);
2349
2350 client->accept_input = 1;
2351 client->accept_output = 1;
2352 client->data.kernel.card = card;
2353 client->user_pversion = SNDRV_SEQ_VERSION;
2354
2355 va_start(args, name_fmt);
2356 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2357 va_end(args);
2358
2359 client->type = KERNEL_CLIENT;
2360 }
2361
2362 /* make others aware this new client */
2363 snd_seq_system_client_ev_client_start(client->number);
2364
2365 /* return client number to caller */
2366 return client->number;
2367}
2368EXPORT_SYMBOL(snd_seq_create_kernel_client);
2369
2370/* exported to kernel modules */
2371int snd_seq_delete_kernel_client(int client)
2372{
2373 struct snd_seq_client *ptr;
2374
2375 if (snd_BUG_ON(in_interrupt()))
2376 return -EBUSY;
2377
2378 ptr = clientptr(client);
2379 if (ptr == NULL)
2380 return -EINVAL;
2381
2382 seq_free_client(ptr);
2383 kfree(ptr);
2384 return 0;
2385}
2386EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2387
2388/*
2389 * exported, called by kernel clients to enqueue events (w/o blocking)
2390 *
2391 * RETURN VALUE: zero if succeed, negative if error
2392 */
2393int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev,
2394 struct file *file, bool blocking)
2395{
2396 if (snd_BUG_ON(!ev))
2397 return -EINVAL;
2398
2399 if (!snd_seq_ev_is_ump(ev)) {
2400 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2401 return 0; /* ignore this */
2402 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2403 return -EINVAL; /* quoted events can't be enqueued */
2404 }
2405
2406 /* fill in client number */
2407 ev->source.client = client;
2408
2409 if (check_event_type_and_length(ev))
2410 return -EINVAL;
2411
2412 struct snd_seq_client *cptr __free(snd_seq_client) =
2413 client_load_and_use_ptr(client);
2414 if (cptr == NULL)
2415 return -EINVAL;
2416
2417 if (!cptr->accept_output) {
2418 return -EPERM;
2419 } else { /* send it */
2420 guard(mutex)(&cptr->ioctl_mutex);
2421 return snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2422 false, 0,
2423 &cptr->ioctl_mutex);
2424 }
2425}
2426EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2427
2428/*
2429 * exported, called by kernel clients to dispatch events directly to other
2430 * clients, bypassing the queues. Event time-stamp will be updated.
2431 *
2432 * RETURN VALUE: negative = delivery failed,
2433 * zero, or positive: the number of delivered events
2434 */
2435int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2436 int atomic, int hop)
2437{
2438 if (snd_BUG_ON(!ev))
2439 return -EINVAL;
2440
2441 /* fill in client number */
2442 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2443 ev->source.client = client;
2444
2445 if (check_event_type_and_length(ev))
2446 return -EINVAL;
2447
2448 struct snd_seq_client *cptr __free(snd_seq_client) =
2449 snd_seq_client_use_ptr(client);
2450 if (cptr == NULL)
2451 return -EINVAL;
2452
2453 if (!cptr->accept_output)
2454 return -EPERM;
2455 else
2456 return snd_seq_deliver_event(cptr, ev, atomic, hop);
2457}
2458EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2459
2460static int call_seq_client_ctl(struct snd_seq_client *client,
2461 unsigned int cmd, void *arg)
2462{
2463 const struct ioctl_handler *handler;
2464
2465 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2466 if (handler->cmd == cmd)
2467 return handler->func(client, arg);
2468 }
2469
2470 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2471 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2472 return -ENOTTY;
2473}
2474
2475/**
2476 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2477 * kernel space.
2478 * @clientid: A numerical ID for a client.
2479 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2480 * @arg: A pointer to data in kernel space.
2481 *
2482 * Against its name, both kernel/application client can be handled by this
2483 * kernel API. A pointer of 'arg' argument should be in kernel space.
2484 *
2485 * Return: 0 at success. Negative error code at failure.
2486 */
2487int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2488{
2489 struct snd_seq_client *client;
2490
2491 client = clientptr(clientid);
2492 if (client == NULL)
2493 return -ENXIO;
2494
2495 return call_seq_client_ctl(client, cmd, arg);
2496}
2497EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2498
2499/* a similar like above but taking locks; used only from OSS sequencer layer */
2500int snd_seq_kernel_client_ioctl(int clientid, unsigned int cmd, void *arg)
2501{
2502 struct snd_seq_client *client __free(snd_seq_client) =
2503 client_load_and_use_ptr(clientid);
2504
2505 if (!client)
2506 return -ENXIO;
2507 guard(mutex)(&client->ioctl_mutex);
2508 return call_seq_client_ctl(client, cmd, arg);
2509}
2510EXPORT_SYMBOL_GPL(snd_seq_kernel_client_ioctl);
2511
2512/* exported (for OSS emulator) */
2513int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2514{
2515 struct snd_seq_client *client;
2516
2517 client = clientptr(clientid);
2518 if (client == NULL)
2519 return -ENXIO;
2520
2521 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2522 return 1;
2523 return 0;
2524}
2525EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2526
2527/* get a sequencer client object; for internal use from a kernel client */
2528struct snd_seq_client *snd_seq_kernel_client_get(int id)
2529{
2530 return snd_seq_client_use_ptr(id);
2531}
2532EXPORT_SYMBOL_GPL(snd_seq_kernel_client_get);
2533
2534/* put a sequencer client object; for internal use from a kernel client */
2535void snd_seq_kernel_client_put(struct snd_seq_client *cptr)
2536{
2537 if (cptr)
2538 snd_seq_client_unref(cptr);
2539}
2540EXPORT_SYMBOL_GPL(snd_seq_kernel_client_put);
2541
2542/*---------------------------------------------------------------------------*/
2543
2544#ifdef CONFIG_SND_PROC_FS
2545/*
2546 * /proc interface
2547 */
2548static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2549 struct snd_seq_port_subs_info *group,
2550 int is_src, char *msg)
2551{
2552 struct hlist_node *p;
2553 struct snd_seq_subscribers *s;
2554 int count = 0;
2555
2556 guard(rwsem_read)(&group->list_mutex);
2557 if (hlist_empty(&group->list_head))
2558 return;
2559 snd_iprintf(buffer, msg);
2560 hlist_for_each(p, &group->list_head) {
2561 if (is_src)
2562 s = hlist_entry(p, struct snd_seq_subscribers, src_list);
2563 else
2564 s = hlist_entry(p, struct snd_seq_subscribers, dest_list);
2565 if (count++)
2566 snd_iprintf(buffer, ", ");
2567 snd_iprintf(buffer, "%d:%d",
2568 is_src ? s->info.dest.client : s->info.sender.client,
2569 is_src ? s->info.dest.port : s->info.sender.port);
2570 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2571 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2572 if (group->exclusive)
2573 snd_iprintf(buffer, "[ex]");
2574 }
2575 snd_iprintf(buffer, "\n");
2576}
2577
2578#define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2579#define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2580#define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2581
2582#define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2583
2584static const char *port_direction_name(unsigned char dir)
2585{
2586 static const char *names[4] = {
2587 "-", "In", "Out", "In/Out"
2588 };
2589
2590 if (dir > SNDRV_SEQ_PORT_DIR_BIDIRECTION)
2591 return "Invalid";
2592 return names[dir];
2593}
2594
2595static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2596 struct snd_seq_client *client)
2597{
2598 struct snd_seq_client_port *p;
2599
2600 guard(mutex)(&client->ports_mutex);
2601 list_for_each_entry(p, &client->ports_list_head, list) {
2602 if (p->capability & SNDRV_SEQ_PORT_CAP_INACTIVE)
2603 continue;
2604 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c) [%s]",
2605 p->addr.port, p->name,
2606 FLAG_PERM_RD(p->capability),
2607 FLAG_PERM_WR(p->capability),
2608 FLAG_PERM_EX(p->capability),
2609 FLAG_PERM_DUPLEX(p->capability),
2610 port_direction_name(p->direction));
2611#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
2612 if (snd_seq_client_is_midi2(client) && p->is_midi1)
2613 snd_iprintf(buffer, " [MIDI1]");
2614#endif
2615 snd_iprintf(buffer, "\n");
2616 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2617 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2618 }
2619}
2620
2621static const char *midi_version_string(unsigned int version)
2622{
2623 switch (version) {
2624 case SNDRV_SEQ_CLIENT_LEGACY_MIDI:
2625 return "Legacy";
2626 case SNDRV_SEQ_CLIENT_UMP_MIDI_1_0:
2627 return "UMP MIDI1";
2628 case SNDRV_SEQ_CLIENT_UMP_MIDI_2_0:
2629 return "UMP MIDI2";
2630 default:
2631 return "Unknown";
2632 }
2633}
2634
2635/* exported to seq_info.c */
2636void snd_seq_info_clients_read(struct snd_info_entry *entry,
2637 struct snd_info_buffer *buffer)
2638{
2639 int c;
2640
2641 snd_iprintf(buffer, "Client info\n");
2642 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2643 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2644 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2645 snd_iprintf(buffer, "\n");
2646
2647 /* list the client table */
2648 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2649 struct snd_seq_client *client __free(snd_seq_client) =
2650 client_load_and_use_ptr(c);
2651
2652 if (client == NULL)
2653 continue;
2654 if (client->type == NO_CLIENT)
2655 continue;
2656
2657 guard(mutex)(&client->ioctl_mutex);
2658 snd_iprintf(buffer, "Client %3d : \"%s\" [%s %s]\n",
2659 c, client->name,
2660 client->type == USER_CLIENT ? "User" : "Kernel",
2661 midi_version_string(client->midi_version));
2662#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
2663 dump_ump_info(buffer, client);
2664#endif
2665 snd_seq_info_dump_ports(buffer, client);
2666 if (snd_seq_write_pool_allocated(client)) {
2667 snd_iprintf(buffer, " Output pool :\n");
2668 snd_seq_info_pool(buffer, client->pool, " ");
2669 }
2670 if (client->type == USER_CLIENT && client->data.user.fifo &&
2671 client->data.user.fifo->pool) {
2672 snd_iprintf(buffer, " Input pool :\n");
2673 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2674 }
2675 }
2676}
2677#endif /* CONFIG_SND_PROC_FS */
2678
2679/*---------------------------------------------------------------------------*/
2680
2681
2682/*
2683 * REGISTRATION PART
2684 */
2685
2686static const struct file_operations snd_seq_f_ops = {
2687 .owner = THIS_MODULE,
2688 .read = snd_seq_read,
2689 .write = snd_seq_write,
2690 .open = snd_seq_open,
2691 .release = snd_seq_release,
2692 .poll = snd_seq_poll,
2693 .unlocked_ioctl = snd_seq_ioctl,
2694 .compat_ioctl = snd_seq_ioctl_compat,
2695};
2696
2697static struct device *seq_dev;
2698
2699/*
2700 * register sequencer device
2701 */
2702int __init snd_sequencer_device_init(void)
2703{
2704 int err;
2705
2706 err = snd_device_alloc(&seq_dev, NULL);
2707 if (err < 0)
2708 return err;
2709 dev_set_name(seq_dev, "seq");
2710
2711 scoped_guard(mutex, &register_mutex) {
2712 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2713 &snd_seq_f_ops, NULL, seq_dev);
2714 }
2715 if (err < 0) {
2716 put_device(seq_dev);
2717 return err;
2718 }
2719
2720 return 0;
2721}
2722
2723
2724
2725/*
2726 * unregister sequencer device
2727 */
2728void snd_sequencer_device_done(void)
2729{
2730 snd_unregister_device(seq_dev);
2731 put_device(seq_dev);
2732}