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 <fvdpol@coil.demon.nl> 5 * Jaroslav Kysela <perex@perex.cz> 6 * Takashi Iwai <tiwai@suse.de> 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 55 static DEFINE_SPINLOCK(clients_lock); 56 static DEFINE_MUTEX(register_mutex); 57 58 /* 59 * client table 60 */ 61 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; 62 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS]; 63 static struct snd_seq_usage client_usage; 64 65 /* 66 * prototypes 67 */ 68 static int bounce_error_event(struct snd_seq_client *client, 69 struct snd_seq_event *event, 70 int err, int atomic, int hop); 71 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 72 struct snd_seq_event *event, 73 int filter, int atomic, int hop); 74 75 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 76 static void free_ump_info(struct snd_seq_client *client); 77 #endif 78 79 /* 80 */ 81 static 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 93 static 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 */ 99 static 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 clienttab[clientid]; 107 } 108 109 struct snd_seq_client *snd_seq_client_use_ptr(int clientid) 110 { 111 unsigned long flags; 112 struct snd_seq_client *client; 113 114 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 115 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 116 clientid); 117 return NULL; 118 } 119 spin_lock_irqsave(&clients_lock, flags); 120 client = clientptr(clientid); 121 if (client) 122 goto __lock; 123 if (clienttablock[clientid]) { 124 spin_unlock_irqrestore(&clients_lock, flags); 125 return NULL; 126 } 127 spin_unlock_irqrestore(&clients_lock, flags); 128 #ifdef CONFIG_MODULES 129 if (!in_interrupt()) { 130 static DECLARE_BITMAP(client_requested, SNDRV_SEQ_GLOBAL_CLIENTS); 131 static DECLARE_BITMAP(card_requested, SNDRV_CARDS); 132 133 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { 134 int idx; 135 136 if (!test_and_set_bit(clientid, client_requested)) { 137 for (idx = 0; idx < 15; idx++) { 138 if (seq_client_load[idx] < 0) 139 break; 140 if (seq_client_load[idx] == clientid) { 141 request_module("snd-seq-client-%i", 142 clientid); 143 break; 144 } 145 } 146 } 147 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { 148 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / 149 SNDRV_SEQ_CLIENTS_PER_CARD; 150 if (card < snd_ecards_limit) { 151 if (!test_and_set_bit(card, card_requested)) 152 snd_request_card(card); 153 snd_seq_device_load_drivers(); 154 } 155 } 156 spin_lock_irqsave(&clients_lock, flags); 157 client = clientptr(clientid); 158 if (client) 159 goto __lock; 160 spin_unlock_irqrestore(&clients_lock, flags); 161 } 162 #endif 163 return NULL; 164 165 __lock: 166 snd_use_lock_use(&client->use_lock); 167 spin_unlock_irqrestore(&clients_lock, flags); 168 return client; 169 } 170 171 /* Take refcount and perform ioctl_mutex lock on the given client; 172 * used only for OSS sequencer 173 * Unlock via snd_seq_client_ioctl_unlock() below 174 */ 175 bool snd_seq_client_ioctl_lock(int clientid) 176 { 177 struct snd_seq_client *client; 178 179 client = snd_seq_client_use_ptr(clientid); 180 if (!client) 181 return false; 182 mutex_lock(&client->ioctl_mutex); 183 /* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */ 184 return true; 185 } 186 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock); 187 188 /* Unlock and unref the given client; for OSS sequencer use only */ 189 void snd_seq_client_ioctl_unlock(int clientid) 190 { 191 struct snd_seq_client *client; 192 193 client = snd_seq_client_use_ptr(clientid); 194 if (WARN_ON(!client)) 195 return; 196 mutex_unlock(&client->ioctl_mutex); 197 /* The doubly unrefs below are intentional; the first one releases the 198 * leftover from snd_seq_client_ioctl_lock() above, and the second one 199 * is for releasing snd_seq_client_use_ptr() in this function 200 */ 201 snd_seq_client_unlock(client); 202 snd_seq_client_unlock(client); 203 } 204 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock); 205 206 static void usage_alloc(struct snd_seq_usage *res, int num) 207 { 208 res->cur += num; 209 if (res->cur > res->peak) 210 res->peak = res->cur; 211 } 212 213 static void usage_free(struct snd_seq_usage *res, int num) 214 { 215 res->cur -= num; 216 } 217 218 /* initialise data structures */ 219 int __init client_init_data(void) 220 { 221 /* zap out the client table */ 222 memset(&clienttablock, 0, sizeof(clienttablock)); 223 memset(&clienttab, 0, sizeof(clienttab)); 224 return 0; 225 } 226 227 228 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) 229 { 230 int c; 231 struct snd_seq_client *client; 232 233 /* init client data */ 234 client = kzalloc(sizeof(*client), GFP_KERNEL); 235 if (client == NULL) 236 return NULL; 237 client->pool = snd_seq_pool_new(poolsize); 238 if (client->pool == NULL) { 239 kfree(client); 240 return NULL; 241 } 242 client->type = NO_CLIENT; 243 snd_use_lock_init(&client->use_lock); 244 rwlock_init(&client->ports_lock); 245 mutex_init(&client->ports_mutex); 246 INIT_LIST_HEAD(&client->ports_list_head); 247 mutex_init(&client->ioctl_mutex); 248 client->ump_endpoint_port = -1; 249 250 /* find free slot in the client table */ 251 spin_lock_irq(&clients_lock); 252 if (client_index < 0) { 253 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; 254 c < SNDRV_SEQ_MAX_CLIENTS; 255 c++) { 256 if (clienttab[c] || clienttablock[c]) 257 continue; 258 clienttab[client->number = c] = client; 259 spin_unlock_irq(&clients_lock); 260 return client; 261 } 262 } else { 263 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 264 clienttab[client->number = client_index] = client; 265 spin_unlock_irq(&clients_lock); 266 return client; 267 } 268 } 269 spin_unlock_irq(&clients_lock); 270 snd_seq_pool_delete(&client->pool); 271 kfree(client); 272 return NULL; /* no free slot found or busy, return failure code */ 273 } 274 275 276 static int seq_free_client1(struct snd_seq_client *client) 277 { 278 if (!client) 279 return 0; 280 spin_lock_irq(&clients_lock); 281 clienttablock[client->number] = 1; 282 clienttab[client->number] = NULL; 283 spin_unlock_irq(&clients_lock); 284 snd_seq_delete_all_ports(client); 285 snd_seq_queue_client_leave(client->number); 286 snd_use_lock_sync(&client->use_lock); 287 if (client->pool) 288 snd_seq_pool_delete(&client->pool); 289 spin_lock_irq(&clients_lock); 290 clienttablock[client->number] = 0; 291 spin_unlock_irq(&clients_lock); 292 return 0; 293 } 294 295 296 static void seq_free_client(struct snd_seq_client * client) 297 { 298 mutex_lock(®ister_mutex); 299 switch (client->type) { 300 case NO_CLIENT: 301 pr_warn("ALSA: seq: Trying to free unused client %d\n", 302 client->number); 303 break; 304 case USER_CLIENT: 305 case KERNEL_CLIENT: 306 seq_free_client1(client); 307 usage_free(&client_usage, 1); 308 break; 309 310 default: 311 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n", 312 client->number, client->type); 313 } 314 mutex_unlock(®ister_mutex); 315 316 snd_seq_system_client_ev_client_exit(client->number); 317 } 318 319 320 321 /* -------------------------------------------------------- */ 322 323 /* create a user client */ 324 static int snd_seq_open(struct inode *inode, struct file *file) 325 { 326 int c, mode; /* client id */ 327 struct snd_seq_client *client; 328 struct snd_seq_user_client *user; 329 int err; 330 331 err = stream_open(inode, file); 332 if (err < 0) 333 return err; 334 335 mutex_lock(®ister_mutex); 336 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 337 if (!client) { 338 mutex_unlock(®ister_mutex); 339 return -ENOMEM; /* failure code */ 340 } 341 342 mode = snd_seq_file_flags(file); 343 if (mode & SNDRV_SEQ_LFLG_INPUT) 344 client->accept_input = 1; 345 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 346 client->accept_output = 1; 347 348 user = &client->data.user; 349 user->fifo = NULL; 350 user->fifo_pool_size = 0; 351 352 if (mode & SNDRV_SEQ_LFLG_INPUT) { 353 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 354 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 355 if (user->fifo == NULL) { 356 seq_free_client1(client); 357 kfree(client); 358 mutex_unlock(®ister_mutex); 359 return -ENOMEM; 360 } 361 } 362 363 usage_alloc(&client_usage, 1); 364 client->type = USER_CLIENT; 365 mutex_unlock(®ister_mutex); 366 367 c = client->number; 368 file->private_data = client; 369 370 /* fill client data */ 371 user->file = file; 372 sprintf(client->name, "Client-%d", c); 373 client->data.user.owner = get_pid(task_pid(current)); 374 375 /* make others aware this new client */ 376 snd_seq_system_client_ev_client_start(c); 377 378 return 0; 379 } 380 381 /* delete a user client */ 382 static int snd_seq_release(struct inode *inode, struct file *file) 383 { 384 struct snd_seq_client *client = file->private_data; 385 386 if (client) { 387 seq_free_client(client); 388 if (client->data.user.fifo) 389 snd_seq_fifo_delete(&client->data.user.fifo); 390 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 391 free_ump_info(client); 392 #endif 393 put_pid(client->data.user.owner); 394 kfree(client); 395 } 396 397 return 0; 398 } 399 400 static bool event_is_compatible(const struct snd_seq_client *client, 401 const struct snd_seq_event *ev) 402 { 403 if (snd_seq_ev_is_ump(ev) && !client->midi_version) 404 return false; 405 if (snd_seq_ev_is_ump(ev) && snd_seq_ev_is_variable(ev)) 406 return false; 407 return true; 408 } 409 410 /* handle client read() */ 411 /* possible error values: 412 * -ENXIO invalid client or file open mode 413 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 414 * -EINVAL no enough user-space buffer to write the whole event 415 * -EFAULT seg. fault during copy to user space 416 */ 417 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, 418 loff_t *offset) 419 { 420 struct snd_seq_client *client = file->private_data; 421 struct snd_seq_fifo *fifo; 422 size_t aligned_size; 423 int err; 424 long result = 0; 425 struct snd_seq_event_cell *cell; 426 427 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 428 return -ENXIO; 429 430 if (!access_ok(buf, count)) 431 return -EFAULT; 432 433 /* check client structures are in place */ 434 if (snd_BUG_ON(!client)) 435 return -ENXIO; 436 437 if (!client->accept_input) 438 return -ENXIO; 439 fifo = client->data.user.fifo; 440 if (!fifo) 441 return -ENXIO; 442 443 if (atomic_read(&fifo->overflow) > 0) { 444 /* buffer overflow is detected */ 445 snd_seq_fifo_clear(fifo); 446 /* return error code */ 447 return -ENOSPC; 448 } 449 450 cell = NULL; 451 err = 0; 452 snd_seq_fifo_lock(fifo); 453 454 if (IS_ENABLED(CONFIG_SND_SEQ_UMP) && client->midi_version > 0) 455 aligned_size = sizeof(struct snd_seq_ump_event); 456 else 457 aligned_size = sizeof(struct snd_seq_event); 458 459 /* while data available in queue */ 460 while (count >= aligned_size) { 461 int nonblock; 462 463 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 464 err = snd_seq_fifo_cell_out(fifo, &cell, nonblock); 465 if (err < 0) 466 break; 467 if (!event_is_compatible(client, &cell->event)) { 468 snd_seq_cell_free(cell); 469 cell = NULL; 470 continue; 471 } 472 if (snd_seq_ev_is_variable(&cell->event)) { 473 struct snd_seq_ump_event tmpev; 474 475 memcpy(&tmpev, &cell->event, aligned_size); 476 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 477 if (copy_to_user(buf, &tmpev, aligned_size)) { 478 err = -EFAULT; 479 break; 480 } 481 count -= aligned_size; 482 buf += aligned_size; 483 err = snd_seq_expand_var_event(&cell->event, count, 484 (char __force *)buf, 0, 485 aligned_size); 486 if (err < 0) 487 break; 488 result += err; 489 count -= err; 490 buf += err; 491 } else { 492 if (copy_to_user(buf, &cell->event, aligned_size)) { 493 err = -EFAULT; 494 break; 495 } 496 count -= aligned_size; 497 buf += aligned_size; 498 } 499 snd_seq_cell_free(cell); 500 cell = NULL; /* to be sure */ 501 result += aligned_size; 502 } 503 504 if (err < 0) { 505 if (cell) 506 snd_seq_fifo_cell_putback(fifo, cell); 507 if (err == -EAGAIN && result > 0) 508 err = 0; 509 } 510 snd_seq_fifo_unlock(fifo); 511 512 return (err < 0) ? err : result; 513 } 514 515 516 /* 517 * check access permission to the port 518 */ 519 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 520 { 521 if ((port->capability & flags) != flags) 522 return 0; 523 return flags; 524 } 525 526 /* 527 * check if the destination client is available, and return the pointer 528 * if filter is non-zero, client filter bitmap is tested. 529 */ 530 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event, 531 int filter) 532 { 533 struct snd_seq_client *dest; 534 535 dest = snd_seq_client_use_ptr(event->dest.client); 536 if (dest == NULL) 537 return NULL; 538 if (! dest->accept_input) 539 goto __not_avail; 540 if (snd_seq_ev_is_ump(event)) 541 return dest; /* ok - no filter checks */ 542 543 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 544 ! test_bit(event->type, dest->event_filter)) 545 goto __not_avail; 546 if (filter && !(dest->filter & filter)) 547 goto __not_avail; 548 549 return dest; /* ok - accessible */ 550 __not_avail: 551 snd_seq_client_unlock(dest); 552 return NULL; 553 } 554 555 556 /* 557 * Return the error event. 558 * 559 * If the receiver client is a user client, the original event is 560 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 561 * the original event is also variable length, the external data is 562 * copied after the event record. 563 * If the receiver client is a kernel client, the original event is 564 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 565 * kmalloc. 566 */ 567 static int bounce_error_event(struct snd_seq_client *client, 568 struct snd_seq_event *event, 569 int err, int atomic, int hop) 570 { 571 struct snd_seq_event bounce_ev; 572 int result; 573 574 if (client == NULL || 575 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 576 ! client->accept_input) 577 return 0; /* ignored */ 578 579 /* set up quoted error */ 580 memset(&bounce_ev, 0, sizeof(bounce_ev)); 581 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 582 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 583 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 584 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 585 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 586 bounce_ev.dest.client = client->number; 587 bounce_ev.dest.port = event->source.port; 588 bounce_ev.data.quote.origin = event->dest; 589 bounce_ev.data.quote.event = event; 590 bounce_ev.data.quote.value = -err; /* use positive value */ 591 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 592 if (result < 0) { 593 client->event_lost++; 594 return result; 595 } 596 597 return result; 598 } 599 600 601 /* 602 * rewrite the time-stamp of the event record with the curren time 603 * of the given queue. 604 * return non-zero if updated. 605 */ 606 static int update_timestamp_of_queue(struct snd_seq_event *event, 607 int queue, int real_time) 608 { 609 struct snd_seq_queue *q; 610 611 q = queueptr(queue); 612 if (! q) 613 return 0; 614 event->queue = queue; 615 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 616 if (real_time) { 617 event->time.time = snd_seq_timer_get_cur_time(q->timer, true); 618 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 619 } else { 620 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 621 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 622 } 623 queuefree(q); 624 return 1; 625 } 626 627 /* deliver a single event; called from below and UMP converter */ 628 int __snd_seq_deliver_single_event(struct snd_seq_client *dest, 629 struct snd_seq_client_port *dest_port, 630 struct snd_seq_event *event, 631 int atomic, int hop) 632 { 633 switch (dest->type) { 634 case USER_CLIENT: 635 if (!dest->data.user.fifo) 636 return 0; 637 return snd_seq_fifo_event_in(dest->data.user.fifo, event); 638 case KERNEL_CLIENT: 639 if (!dest_port->event_input) 640 return 0; 641 return dest_port->event_input(event, 642 snd_seq_ev_is_direct(event), 643 dest_port->private_data, 644 atomic, hop); 645 } 646 return 0; 647 } 648 649 /* 650 * deliver an event to the specified destination. 651 * if filter is non-zero, client filter bitmap is tested. 652 * 653 * RETURN VALUE: 0 : if succeeded 654 * <0 : error 655 */ 656 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 657 struct snd_seq_event *event, 658 int filter, int atomic, int hop) 659 { 660 struct snd_seq_client *dest = NULL; 661 struct snd_seq_client_port *dest_port = NULL; 662 int result = -ENOENT; 663 int direct; 664 665 direct = snd_seq_ev_is_direct(event); 666 667 dest = get_event_dest_client(event, filter); 668 if (dest == NULL) 669 goto __skip; 670 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 671 if (dest_port == NULL) 672 goto __skip; 673 674 /* check permission */ 675 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 676 result = -EPERM; 677 goto __skip; 678 } 679 680 if (dest_port->timestamping) 681 update_timestamp_of_queue(event, dest_port->time_queue, 682 dest_port->time_real); 683 684 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 685 if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT)) { 686 if (snd_seq_ev_is_ump(event)) { 687 result = snd_seq_deliver_from_ump(client, dest, dest_port, 688 event, atomic, hop); 689 goto __skip; 690 } else if (snd_seq_client_is_ump(dest)) { 691 result = snd_seq_deliver_to_ump(client, dest, dest_port, 692 event, atomic, hop); 693 goto __skip; 694 } 695 } 696 #endif /* CONFIG_SND_SEQ_UMP */ 697 698 result = __snd_seq_deliver_single_event(dest, dest_port, event, 699 atomic, hop); 700 701 __skip: 702 if (dest_port) 703 snd_seq_port_unlock(dest_port); 704 if (dest) 705 snd_seq_client_unlock(dest); 706 707 if (result < 0 && !direct) { 708 result = bounce_error_event(client, event, result, atomic, hop); 709 } 710 return result; 711 } 712 713 714 /* 715 * send the event to all subscribers: 716 */ 717 static int __deliver_to_subscribers(struct snd_seq_client *client, 718 struct snd_seq_event *event, 719 struct snd_seq_client_port *src_port, 720 int atomic, int hop) 721 { 722 struct snd_seq_subscribers *subs; 723 int err, result = 0, num_ev = 0; 724 union __snd_seq_event event_saved; 725 size_t saved_size; 726 struct snd_seq_port_subs_info *grp; 727 728 /* save original event record */ 729 saved_size = snd_seq_event_packet_size(event); 730 memcpy(&event_saved, event, saved_size); 731 grp = &src_port->c_src; 732 733 /* lock list */ 734 if (atomic) 735 read_lock(&grp->list_lock); 736 else 737 down_read_nested(&grp->list_mutex, hop); 738 list_for_each_entry(subs, &grp->list_head, src_list) { 739 /* both ports ready? */ 740 if (atomic_read(&subs->ref_count) != 2) 741 continue; 742 event->dest = subs->info.dest; 743 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 744 /* convert time according to flag with subscription */ 745 update_timestamp_of_queue(event, subs->info.queue, 746 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 747 err = snd_seq_deliver_single_event(client, event, 748 0, atomic, hop); 749 if (err < 0) { 750 /* save first error that occurs and continue */ 751 if (!result) 752 result = err; 753 continue; 754 } 755 num_ev++; 756 /* restore original event record */ 757 memcpy(event, &event_saved, saved_size); 758 } 759 if (atomic) 760 read_unlock(&grp->list_lock); 761 else 762 up_read(&grp->list_mutex); 763 memcpy(event, &event_saved, saved_size); 764 return (result < 0) ? result : num_ev; 765 } 766 767 static int deliver_to_subscribers(struct snd_seq_client *client, 768 struct snd_seq_event *event, 769 int atomic, int hop) 770 { 771 struct snd_seq_client_port *src_port; 772 int ret = 0, ret2; 773 774 src_port = snd_seq_port_use_ptr(client, event->source.port); 775 if (src_port) { 776 ret = __deliver_to_subscribers(client, event, src_port, atomic, hop); 777 snd_seq_port_unlock(src_port); 778 } 779 780 if (client->ump_endpoint_port < 0 || 781 event->source.port == client->ump_endpoint_port) 782 return ret; 783 784 src_port = snd_seq_port_use_ptr(client, client->ump_endpoint_port); 785 if (!src_port) 786 return ret; 787 ret2 = __deliver_to_subscribers(client, event, src_port, atomic, hop); 788 snd_seq_port_unlock(src_port); 789 return ret2 < 0 ? ret2 : ret; 790 } 791 792 /* deliver an event to the destination port(s). 793 * if the event is to subscribers or broadcast, the event is dispatched 794 * to multiple targets. 795 * 796 * RETURN VALUE: n > 0 : the number of delivered events. 797 * n == 0 : the event was not passed to any client. 798 * n < 0 : error - event was not processed. 799 */ 800 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 801 int atomic, int hop) 802 { 803 int result; 804 805 hop++; 806 if (hop >= SNDRV_SEQ_MAX_HOPS) { 807 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 808 event->source.client, event->source.port, 809 event->dest.client, event->dest.port); 810 return -EMLINK; 811 } 812 813 if (snd_seq_ev_is_variable(event) && 814 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR))) 815 return -EINVAL; 816 817 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 818 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 819 result = deliver_to_subscribers(client, event, atomic, hop); 820 else 821 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 822 823 return result; 824 } 825 826 /* 827 * dispatch an event cell: 828 * This function is called only from queue check routines in timer 829 * interrupts or after enqueued. 830 * The event cell shall be released or re-queued in this function. 831 * 832 * RETURN VALUE: n > 0 : the number of delivered events. 833 * n == 0 : the event was not passed to any client. 834 * n < 0 : error - event was not processed. 835 */ 836 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 837 { 838 struct snd_seq_client *client; 839 int result; 840 841 if (snd_BUG_ON(!cell)) 842 return -EINVAL; 843 844 client = snd_seq_client_use_ptr(cell->event.source.client); 845 if (client == NULL) { 846 snd_seq_cell_free(cell); /* release this cell */ 847 return -EINVAL; 848 } 849 850 if (!snd_seq_ev_is_ump(&cell->event) && 851 cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 852 /* NOTE event: 853 * the event cell is re-used as a NOTE-OFF event and 854 * enqueued again. 855 */ 856 struct snd_seq_event tmpev, *ev; 857 858 /* reserve this event to enqueue note-off later */ 859 tmpev = cell->event; 860 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 861 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 862 863 /* 864 * This was originally a note event. We now re-use the 865 * cell for the note-off event. 866 */ 867 868 ev = &cell->event; 869 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 870 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 871 872 /* add the duration time */ 873 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 874 case SNDRV_SEQ_TIME_STAMP_TICK: 875 cell->event.time.tick += ev->data.note.duration; 876 break; 877 case SNDRV_SEQ_TIME_STAMP_REAL: 878 /* unit for duration is ms */ 879 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 880 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 881 ev->time.time.tv_nsec / 1000000000; 882 ev->time.time.tv_nsec %= 1000000000; 883 break; 884 } 885 ev->data.note.velocity = ev->data.note.off_velocity; 886 887 /* Now queue this cell as the note off event */ 888 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 889 snd_seq_cell_free(cell); /* release this cell */ 890 891 } else { 892 /* Normal events: 893 * event cell is freed after processing the event 894 */ 895 896 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 897 snd_seq_cell_free(cell); 898 } 899 900 snd_seq_client_unlock(client); 901 return result; 902 } 903 904 905 /* Allocate a cell from client pool and enqueue it to queue: 906 * if pool is empty and blocking is TRUE, sleep until a new cell is 907 * available. 908 */ 909 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 910 struct snd_seq_event *event, 911 struct file *file, int blocking, 912 int atomic, int hop, 913 struct mutex *mutexp) 914 { 915 struct snd_seq_event_cell *cell; 916 int err; 917 918 /* special queue values - force direct passing */ 919 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 920 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 921 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 922 } else if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 923 /* check presence of source port */ 924 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 925 if (src_port == NULL) 926 return -EINVAL; 927 snd_seq_port_unlock(src_port); 928 } 929 930 /* direct event processing without enqueued */ 931 if (snd_seq_ev_is_direct(event)) { 932 if (!snd_seq_ev_is_ump(event) && 933 event->type == SNDRV_SEQ_EVENT_NOTE) 934 return -EINVAL; /* this event must be enqueued! */ 935 return snd_seq_deliver_event(client, event, atomic, hop); 936 } 937 938 /* Not direct, normal queuing */ 939 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 940 return -EINVAL; /* invalid queue */ 941 if (! snd_seq_write_pool_allocated(client)) 942 return -ENXIO; /* queue is not allocated */ 943 944 /* allocate an event cell */ 945 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, 946 file, mutexp); 947 if (err < 0) 948 return err; 949 950 /* we got a cell. enqueue it. */ 951 err = snd_seq_enqueue_event(cell, atomic, hop); 952 if (err < 0) { 953 snd_seq_cell_free(cell); 954 return err; 955 } 956 957 return 0; 958 } 959 960 961 /* 962 * check validity of event type and data length. 963 * return non-zero if invalid. 964 */ 965 static int check_event_type_and_length(struct snd_seq_event *ev) 966 { 967 switch (snd_seq_ev_length_type(ev)) { 968 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 969 if (snd_seq_ev_is_variable_type(ev)) 970 return -EINVAL; 971 break; 972 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 973 if (! snd_seq_ev_is_variable_type(ev) || 974 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 975 return -EINVAL; 976 break; 977 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 978 if (! snd_seq_ev_is_direct(ev)) 979 return -EINVAL; 980 break; 981 } 982 return 0; 983 } 984 985 986 /* handle write() */ 987 /* possible error values: 988 * -ENXIO invalid client or file open mode 989 * -ENOMEM malloc failed 990 * -EFAULT seg. fault during copy from user space 991 * -EINVAL invalid event 992 * -EAGAIN no space in output pool 993 * -EINTR interrupts while sleep 994 * -EMLINK too many hops 995 * others depends on return value from driver callback 996 */ 997 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 998 size_t count, loff_t *offset) 999 { 1000 struct snd_seq_client *client = file->private_data; 1001 int written = 0, len; 1002 int err, handled; 1003 union __snd_seq_event __event; 1004 struct snd_seq_event *ev = &__event.legacy; 1005 1006 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1007 return -ENXIO; 1008 1009 /* check client structures are in place */ 1010 if (snd_BUG_ON(!client)) 1011 return -ENXIO; 1012 1013 if (!client->accept_output || client->pool == NULL) 1014 return -ENXIO; 1015 1016 repeat: 1017 handled = 0; 1018 /* allocate the pool now if the pool is not allocated yet */ 1019 mutex_lock(&client->ioctl_mutex); 1020 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1021 err = snd_seq_pool_init(client->pool); 1022 if (err < 0) 1023 goto out; 1024 } 1025 1026 /* only process whole events */ 1027 err = -EINVAL; 1028 while (count >= sizeof(struct snd_seq_event)) { 1029 /* Read in the event header from the user */ 1030 len = sizeof(struct snd_seq_event); 1031 if (copy_from_user(ev, buf, len)) { 1032 err = -EFAULT; 1033 break; 1034 } 1035 /* read in the rest bytes for UMP events */ 1036 if (snd_seq_ev_is_ump(ev)) { 1037 if (count < sizeof(struct snd_seq_ump_event)) 1038 break; 1039 if (copy_from_user((char *)ev + len, buf + len, 1040 sizeof(struct snd_seq_ump_event) - len)) { 1041 err = -EFAULT; 1042 break; 1043 } 1044 len = sizeof(struct snd_seq_ump_event); 1045 } 1046 1047 ev->source.client = client->number; /* fill in client number */ 1048 /* Check for extension data length */ 1049 if (check_event_type_and_length(ev)) { 1050 err = -EINVAL; 1051 break; 1052 } 1053 1054 if (!event_is_compatible(client, ev)) { 1055 err = -EINVAL; 1056 break; 1057 } 1058 1059 /* check for special events */ 1060 if (!snd_seq_ev_is_ump(ev)) { 1061 if (ev->type == SNDRV_SEQ_EVENT_NONE) 1062 goto __skip_event; 1063 else if (snd_seq_ev_is_reserved(ev)) { 1064 err = -EINVAL; 1065 break; 1066 } 1067 } 1068 1069 if (snd_seq_ev_is_variable(ev)) { 1070 int extlen = ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1071 if ((size_t)(extlen + len) > count) { 1072 /* back out, will get an error this time or next */ 1073 err = -EINVAL; 1074 break; 1075 } 1076 /* set user space pointer */ 1077 ev->data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1078 ev->data.ext.ptr = (char __force *)buf + len; 1079 len += extlen; /* increment data length */ 1080 } else { 1081 #ifdef CONFIG_COMPAT 1082 if (client->convert32 && snd_seq_ev_is_varusr(ev)) 1083 ev->data.ext.ptr = 1084 (void __force *)compat_ptr(ev->data.raw32.d[1]); 1085 #endif 1086 } 1087 1088 /* ok, enqueue it */ 1089 err = snd_seq_client_enqueue_event(client, ev, file, 1090 !(file->f_flags & O_NONBLOCK), 1091 0, 0, &client->ioctl_mutex); 1092 if (err < 0) 1093 break; 1094 handled++; 1095 1096 __skip_event: 1097 /* Update pointers and counts */ 1098 count -= len; 1099 buf += len; 1100 written += len; 1101 1102 /* let's have a coffee break if too many events are queued */ 1103 if (++handled >= 200) { 1104 mutex_unlock(&client->ioctl_mutex); 1105 goto repeat; 1106 } 1107 } 1108 1109 out: 1110 mutex_unlock(&client->ioctl_mutex); 1111 return written ? written : err; 1112 } 1113 1114 1115 /* 1116 * handle polling 1117 */ 1118 static __poll_t snd_seq_poll(struct file *file, poll_table * wait) 1119 { 1120 struct snd_seq_client *client = file->private_data; 1121 __poll_t mask = 0; 1122 1123 /* check client structures are in place */ 1124 if (snd_BUG_ON(!client)) 1125 return EPOLLERR; 1126 1127 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1128 client->data.user.fifo) { 1129 1130 /* check if data is available in the outqueue */ 1131 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1132 mask |= EPOLLIN | EPOLLRDNORM; 1133 } 1134 1135 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1136 1137 /* check if data is available in the pool */ 1138 if (!snd_seq_write_pool_allocated(client) || 1139 snd_seq_pool_poll_wait(client->pool, file, wait)) 1140 mask |= EPOLLOUT | EPOLLWRNORM; 1141 } 1142 1143 return mask; 1144 } 1145 1146 1147 /*-----------------------------------------------------*/ 1148 1149 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg) 1150 { 1151 int *pversion = arg; 1152 1153 *pversion = SNDRV_SEQ_VERSION; 1154 return 0; 1155 } 1156 1157 static int snd_seq_ioctl_user_pversion(struct snd_seq_client *client, void *arg) 1158 { 1159 client->user_pversion = *(unsigned int *)arg; 1160 return 0; 1161 } 1162 1163 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg) 1164 { 1165 int *client_id = arg; 1166 1167 *client_id = client->number; 1168 return 0; 1169 } 1170 1171 /* SYSTEM_INFO ioctl() */ 1172 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg) 1173 { 1174 struct snd_seq_system_info *info = arg; 1175 1176 memset(info, 0, sizeof(*info)); 1177 /* fill the info fields */ 1178 info->queues = SNDRV_SEQ_MAX_QUEUES; 1179 info->clients = SNDRV_SEQ_MAX_CLIENTS; 1180 info->ports = SNDRV_SEQ_MAX_PORTS; 1181 info->channels = 256; /* fixed limit */ 1182 info->cur_clients = client_usage.cur; 1183 info->cur_queues = snd_seq_queue_get_cur_queues(); 1184 1185 return 0; 1186 } 1187 1188 1189 /* RUNNING_MODE ioctl() */ 1190 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg) 1191 { 1192 struct snd_seq_running_info *info = arg; 1193 struct snd_seq_client *cptr; 1194 int err = 0; 1195 1196 /* requested client number */ 1197 cptr = snd_seq_client_use_ptr(info->client); 1198 if (cptr == NULL) 1199 return -ENOENT; /* don't change !!! */ 1200 1201 #ifdef SNDRV_BIG_ENDIAN 1202 if (!info->big_endian) { 1203 err = -EINVAL; 1204 goto __err; 1205 } 1206 #else 1207 if (info->big_endian) { 1208 err = -EINVAL; 1209 goto __err; 1210 } 1211 1212 #endif 1213 if (info->cpu_mode > sizeof(long)) { 1214 err = -EINVAL; 1215 goto __err; 1216 } 1217 cptr->convert32 = (info->cpu_mode < sizeof(long)); 1218 __err: 1219 snd_seq_client_unlock(cptr); 1220 return err; 1221 } 1222 1223 /* CLIENT_INFO ioctl() */ 1224 static void get_client_info(struct snd_seq_client *cptr, 1225 struct snd_seq_client_info *info) 1226 { 1227 info->client = cptr->number; 1228 1229 /* fill the info fields */ 1230 info->type = cptr->type; 1231 strcpy(info->name, cptr->name); 1232 info->filter = cptr->filter; 1233 info->event_lost = cptr->event_lost; 1234 memcpy(info->event_filter, cptr->event_filter, 32); 1235 info->group_filter = cptr->group_filter; 1236 info->num_ports = cptr->num_ports; 1237 1238 if (cptr->type == USER_CLIENT) 1239 info->pid = pid_vnr(cptr->data.user.owner); 1240 else 1241 info->pid = -1; 1242 1243 if (cptr->type == KERNEL_CLIENT) 1244 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; 1245 else 1246 info->card = -1; 1247 1248 info->midi_version = cptr->midi_version; 1249 memset(info->reserved, 0, sizeof(info->reserved)); 1250 } 1251 1252 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1253 void *arg) 1254 { 1255 struct snd_seq_client_info *client_info = arg; 1256 struct snd_seq_client *cptr; 1257 1258 /* requested client number */ 1259 cptr = snd_seq_client_use_ptr(client_info->client); 1260 if (cptr == NULL) 1261 return -ENOENT; /* don't change !!! */ 1262 1263 get_client_info(cptr, client_info); 1264 snd_seq_client_unlock(cptr); 1265 1266 return 0; 1267 } 1268 1269 1270 /* CLIENT_INFO ioctl() */ 1271 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1272 void *arg) 1273 { 1274 struct snd_seq_client_info *client_info = arg; 1275 1276 /* it is not allowed to set the info fields for an another client */ 1277 if (client->number != client_info->client) 1278 return -EPERM; 1279 /* also client type must be set now */ 1280 if (client->type != client_info->type) 1281 return -EINVAL; 1282 1283 /* check validity of midi_version field */ 1284 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3) && 1285 client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0) 1286 return -EINVAL; 1287 1288 /* fill the info fields */ 1289 if (client_info->name[0]) 1290 strscpy(client->name, client_info->name, sizeof(client->name)); 1291 1292 client->filter = client_info->filter; 1293 client->event_lost = client_info->event_lost; 1294 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) 1295 client->midi_version = client_info->midi_version; 1296 memcpy(client->event_filter, client_info->event_filter, 32); 1297 client->group_filter = client_info->group_filter; 1298 return 0; 1299 } 1300 1301 1302 /* 1303 * CREATE PORT ioctl() 1304 */ 1305 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg) 1306 { 1307 struct snd_seq_port_info *info = arg; 1308 struct snd_seq_client_port *port; 1309 struct snd_seq_port_callback *callback; 1310 int port_idx, err; 1311 1312 /* it is not allowed to create the port for an another client */ 1313 if (info->addr.client != client->number) 1314 return -EPERM; 1315 if (client->type == USER_CLIENT && info->kernel) 1316 return -EINVAL; 1317 if ((info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) && 1318 client->ump_endpoint_port >= 0) 1319 return -EBUSY; 1320 1321 if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) 1322 port_idx = info->addr.port; 1323 else 1324 port_idx = -1; 1325 if (port_idx >= SNDRV_SEQ_ADDRESS_UNKNOWN) 1326 return -EINVAL; 1327 err = snd_seq_create_port(client, port_idx, &port); 1328 if (err < 0) 1329 return err; 1330 1331 if (client->type == KERNEL_CLIENT) { 1332 callback = info->kernel; 1333 if (callback) { 1334 if (callback->owner) 1335 port->owner = callback->owner; 1336 port->private_data = callback->private_data; 1337 port->private_free = callback->private_free; 1338 port->event_input = callback->event_input; 1339 port->c_src.open = callback->subscribe; 1340 port->c_src.close = callback->unsubscribe; 1341 port->c_dest.open = callback->use; 1342 port->c_dest.close = callback->unuse; 1343 } 1344 } 1345 1346 info->addr = port->addr; 1347 1348 snd_seq_set_port_info(port, info); 1349 if (info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) 1350 client->ump_endpoint_port = port->addr.port; 1351 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1352 snd_seq_port_unlock(port); 1353 1354 return 0; 1355 } 1356 1357 /* 1358 * DELETE PORT ioctl() 1359 */ 1360 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg) 1361 { 1362 struct snd_seq_port_info *info = arg; 1363 int err; 1364 1365 /* it is not allowed to remove the port for an another client */ 1366 if (info->addr.client != client->number) 1367 return -EPERM; 1368 1369 err = snd_seq_delete_port(client, info->addr.port); 1370 if (err >= 0) { 1371 if (client->ump_endpoint_port == info->addr.port) 1372 client->ump_endpoint_port = -1; 1373 snd_seq_system_client_ev_port_exit(client->number, info->addr.port); 1374 } 1375 return err; 1376 } 1377 1378 1379 /* 1380 * GET_PORT_INFO ioctl() (on any client) 1381 */ 1382 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg) 1383 { 1384 struct snd_seq_port_info *info = arg; 1385 struct snd_seq_client *cptr; 1386 struct snd_seq_client_port *port; 1387 1388 cptr = snd_seq_client_use_ptr(info->addr.client); 1389 if (cptr == NULL) 1390 return -ENXIO; 1391 1392 port = snd_seq_port_use_ptr(cptr, info->addr.port); 1393 if (port == NULL) { 1394 snd_seq_client_unlock(cptr); 1395 return -ENOENT; /* don't change */ 1396 } 1397 1398 /* get port info */ 1399 snd_seq_get_port_info(port, info); 1400 snd_seq_port_unlock(port); 1401 snd_seq_client_unlock(cptr); 1402 1403 return 0; 1404 } 1405 1406 1407 /* 1408 * SET_PORT_INFO ioctl() (only ports on this/own client) 1409 */ 1410 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg) 1411 { 1412 struct snd_seq_port_info *info = arg; 1413 struct snd_seq_client_port *port; 1414 1415 if (info->addr.client != client->number) /* only set our own ports ! */ 1416 return -EPERM; 1417 port = snd_seq_port_use_ptr(client, info->addr.port); 1418 if (port) { 1419 snd_seq_set_port_info(port, info); 1420 snd_seq_port_unlock(port); 1421 } 1422 return 0; 1423 } 1424 1425 1426 /* 1427 * port subscription (connection) 1428 */ 1429 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1430 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1431 1432 static int check_subscription_permission(struct snd_seq_client *client, 1433 struct snd_seq_client_port *sport, 1434 struct snd_seq_client_port *dport, 1435 struct snd_seq_port_subscribe *subs) 1436 { 1437 if (client->number != subs->sender.client && 1438 client->number != subs->dest.client) { 1439 /* connection by third client - check export permission */ 1440 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1441 return -EPERM; 1442 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1443 return -EPERM; 1444 } 1445 1446 /* check read permission */ 1447 /* if sender or receiver is the subscribing client itself, 1448 * no permission check is necessary 1449 */ 1450 if (client->number != subs->sender.client) { 1451 if (! check_port_perm(sport, PERM_RD)) 1452 return -EPERM; 1453 } 1454 /* check write permission */ 1455 if (client->number != subs->dest.client) { 1456 if (! check_port_perm(dport, PERM_WR)) 1457 return -EPERM; 1458 } 1459 return 0; 1460 } 1461 1462 /* 1463 * send an subscription notify event to user client: 1464 * client must be user client. 1465 */ 1466 int snd_seq_client_notify_subscription(int client, int port, 1467 struct snd_seq_port_subscribe *info, 1468 int evtype) 1469 { 1470 struct snd_seq_event event; 1471 1472 memset(&event, 0, sizeof(event)); 1473 event.type = evtype; 1474 event.data.connect.dest = info->dest; 1475 event.data.connect.sender = info->sender; 1476 1477 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1478 } 1479 1480 1481 /* 1482 * add to port's subscription list IOCTL interface 1483 */ 1484 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1485 void *arg) 1486 { 1487 struct snd_seq_port_subscribe *subs = arg; 1488 int result = -EINVAL; 1489 struct snd_seq_client *receiver = NULL, *sender = NULL; 1490 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1491 1492 receiver = snd_seq_client_use_ptr(subs->dest.client); 1493 if (!receiver) 1494 goto __end; 1495 sender = snd_seq_client_use_ptr(subs->sender.client); 1496 if (!sender) 1497 goto __end; 1498 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1499 if (!sport) 1500 goto __end; 1501 dport = snd_seq_port_use_ptr(receiver, subs->dest.port); 1502 if (!dport) 1503 goto __end; 1504 1505 result = check_subscription_permission(client, sport, dport, subs); 1506 if (result < 0) 1507 goto __end; 1508 1509 /* connect them */ 1510 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs); 1511 if (! result) /* broadcast announce */ 1512 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1513 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1514 __end: 1515 if (sport) 1516 snd_seq_port_unlock(sport); 1517 if (dport) 1518 snd_seq_port_unlock(dport); 1519 if (sender) 1520 snd_seq_client_unlock(sender); 1521 if (receiver) 1522 snd_seq_client_unlock(receiver); 1523 return result; 1524 } 1525 1526 1527 /* 1528 * remove from port's subscription list 1529 */ 1530 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1531 void *arg) 1532 { 1533 struct snd_seq_port_subscribe *subs = arg; 1534 int result = -ENXIO; 1535 struct snd_seq_client *receiver = NULL, *sender = NULL; 1536 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1537 1538 receiver = snd_seq_client_use_ptr(subs->dest.client); 1539 if (!receiver) 1540 goto __end; 1541 sender = snd_seq_client_use_ptr(subs->sender.client); 1542 if (!sender) 1543 goto __end; 1544 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1545 if (!sport) 1546 goto __end; 1547 dport = snd_seq_port_use_ptr(receiver, subs->dest.port); 1548 if (!dport) 1549 goto __end; 1550 1551 result = check_subscription_permission(client, sport, dport, subs); 1552 if (result < 0) 1553 goto __end; 1554 1555 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs); 1556 if (! result) /* broadcast announce */ 1557 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1558 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1559 __end: 1560 if (sport) 1561 snd_seq_port_unlock(sport); 1562 if (dport) 1563 snd_seq_port_unlock(dport); 1564 if (sender) 1565 snd_seq_client_unlock(sender); 1566 if (receiver) 1567 snd_seq_client_unlock(receiver); 1568 return result; 1569 } 1570 1571 1572 /* CREATE_QUEUE ioctl() */ 1573 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg) 1574 { 1575 struct snd_seq_queue_info *info = arg; 1576 struct snd_seq_queue *q; 1577 1578 q = snd_seq_queue_alloc(client->number, info->locked, info->flags); 1579 if (IS_ERR(q)) 1580 return PTR_ERR(q); 1581 1582 info->queue = q->queue; 1583 info->locked = q->locked; 1584 info->owner = q->owner; 1585 1586 /* set queue name */ 1587 if (!info->name[0]) 1588 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue); 1589 strscpy(q->name, info->name, sizeof(q->name)); 1590 snd_use_lock_free(&q->use_lock); 1591 1592 return 0; 1593 } 1594 1595 /* DELETE_QUEUE ioctl() */ 1596 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg) 1597 { 1598 struct snd_seq_queue_info *info = arg; 1599 1600 return snd_seq_queue_delete(client->number, info->queue); 1601 } 1602 1603 /* GET_QUEUE_INFO ioctl() */ 1604 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1605 void *arg) 1606 { 1607 struct snd_seq_queue_info *info = arg; 1608 struct snd_seq_queue *q; 1609 1610 q = queueptr(info->queue); 1611 if (q == NULL) 1612 return -EINVAL; 1613 1614 memset(info, 0, sizeof(*info)); 1615 info->queue = q->queue; 1616 info->owner = q->owner; 1617 info->locked = q->locked; 1618 strscpy(info->name, q->name, sizeof(info->name)); 1619 queuefree(q); 1620 1621 return 0; 1622 } 1623 1624 /* SET_QUEUE_INFO ioctl() */ 1625 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1626 void *arg) 1627 { 1628 struct snd_seq_queue_info *info = arg; 1629 struct snd_seq_queue *q; 1630 1631 if (info->owner != client->number) 1632 return -EINVAL; 1633 1634 /* change owner/locked permission */ 1635 if (snd_seq_queue_check_access(info->queue, client->number)) { 1636 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0) 1637 return -EPERM; 1638 if (info->locked) 1639 snd_seq_queue_use(info->queue, client->number, 1); 1640 } else { 1641 return -EPERM; 1642 } 1643 1644 q = queueptr(info->queue); 1645 if (! q) 1646 return -EINVAL; 1647 if (q->owner != client->number) { 1648 queuefree(q); 1649 return -EPERM; 1650 } 1651 strscpy(q->name, info->name, sizeof(q->name)); 1652 queuefree(q); 1653 1654 return 0; 1655 } 1656 1657 /* GET_NAMED_QUEUE ioctl() */ 1658 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, 1659 void *arg) 1660 { 1661 struct snd_seq_queue_info *info = arg; 1662 struct snd_seq_queue *q; 1663 1664 q = snd_seq_queue_find_name(info->name); 1665 if (q == NULL) 1666 return -EINVAL; 1667 info->queue = q->queue; 1668 info->owner = q->owner; 1669 info->locked = q->locked; 1670 queuefree(q); 1671 1672 return 0; 1673 } 1674 1675 /* GET_QUEUE_STATUS ioctl() */ 1676 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1677 void *arg) 1678 { 1679 struct snd_seq_queue_status *status = arg; 1680 struct snd_seq_queue *queue; 1681 struct snd_seq_timer *tmr; 1682 1683 queue = queueptr(status->queue); 1684 if (queue == NULL) 1685 return -EINVAL; 1686 memset(status, 0, sizeof(*status)); 1687 status->queue = queue->queue; 1688 1689 tmr = queue->timer; 1690 status->events = queue->tickq->cells + queue->timeq->cells; 1691 1692 status->time = snd_seq_timer_get_cur_time(tmr, true); 1693 status->tick = snd_seq_timer_get_cur_tick(tmr); 1694 1695 status->running = tmr->running; 1696 1697 status->flags = queue->flags; 1698 queuefree(queue); 1699 1700 return 0; 1701 } 1702 1703 1704 /* GET_QUEUE_TEMPO ioctl() */ 1705 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1706 void *arg) 1707 { 1708 struct snd_seq_queue_tempo *tempo = arg; 1709 struct snd_seq_queue *queue; 1710 struct snd_seq_timer *tmr; 1711 1712 queue = queueptr(tempo->queue); 1713 if (queue == NULL) 1714 return -EINVAL; 1715 memset(tempo, 0, sizeof(*tempo)); 1716 tempo->queue = queue->queue; 1717 1718 tmr = queue->timer; 1719 1720 tempo->tempo = tmr->tempo; 1721 tempo->ppq = tmr->ppq; 1722 tempo->skew_value = tmr->skew; 1723 tempo->skew_base = tmr->skew_base; 1724 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 4)) 1725 tempo->tempo_base = tmr->tempo_base; 1726 queuefree(queue); 1727 1728 return 0; 1729 } 1730 1731 1732 /* SET_QUEUE_TEMPO ioctl() */ 1733 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1734 { 1735 if (!snd_seq_queue_check_access(tempo->queue, client)) 1736 return -EPERM; 1737 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1738 } 1739 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1740 1741 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1742 void *arg) 1743 { 1744 struct snd_seq_queue_tempo *tempo = arg; 1745 int result; 1746 1747 if (client->user_pversion < SNDRV_PROTOCOL_VERSION(1, 0, 4)) 1748 tempo->tempo_base = 0; 1749 result = snd_seq_set_queue_tempo(client->number, tempo); 1750 return result < 0 ? result : 0; 1751 } 1752 1753 1754 /* GET_QUEUE_TIMER ioctl() */ 1755 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1756 void *arg) 1757 { 1758 struct snd_seq_queue_timer *timer = arg; 1759 struct snd_seq_queue *queue; 1760 struct snd_seq_timer *tmr; 1761 1762 queue = queueptr(timer->queue); 1763 if (queue == NULL) 1764 return -EINVAL; 1765 1766 mutex_lock(&queue->timer_mutex); 1767 tmr = queue->timer; 1768 memset(timer, 0, sizeof(*timer)); 1769 timer->queue = queue->queue; 1770 1771 timer->type = tmr->type; 1772 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1773 timer->u.alsa.id = tmr->alsa_id; 1774 timer->u.alsa.resolution = tmr->preferred_resolution; 1775 } 1776 mutex_unlock(&queue->timer_mutex); 1777 queuefree(queue); 1778 1779 return 0; 1780 } 1781 1782 1783 /* SET_QUEUE_TIMER ioctl() */ 1784 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1785 void *arg) 1786 { 1787 struct snd_seq_queue_timer *timer = arg; 1788 int result = 0; 1789 1790 if (timer->type != SNDRV_SEQ_TIMER_ALSA) 1791 return -EINVAL; 1792 1793 if (snd_seq_queue_check_access(timer->queue, client->number)) { 1794 struct snd_seq_queue *q; 1795 struct snd_seq_timer *tmr; 1796 1797 q = queueptr(timer->queue); 1798 if (q == NULL) 1799 return -ENXIO; 1800 mutex_lock(&q->timer_mutex); 1801 tmr = q->timer; 1802 snd_seq_queue_timer_close(timer->queue); 1803 tmr->type = timer->type; 1804 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1805 tmr->alsa_id = timer->u.alsa.id; 1806 tmr->preferred_resolution = timer->u.alsa.resolution; 1807 } 1808 result = snd_seq_queue_timer_open(timer->queue); 1809 mutex_unlock(&q->timer_mutex); 1810 queuefree(q); 1811 } else { 1812 return -EPERM; 1813 } 1814 1815 return result; 1816 } 1817 1818 1819 /* GET_QUEUE_CLIENT ioctl() */ 1820 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1821 void *arg) 1822 { 1823 struct snd_seq_queue_client *info = arg; 1824 int used; 1825 1826 used = snd_seq_queue_is_used(info->queue, client->number); 1827 if (used < 0) 1828 return -EINVAL; 1829 info->used = used; 1830 info->client = client->number; 1831 1832 return 0; 1833 } 1834 1835 1836 /* SET_QUEUE_CLIENT ioctl() */ 1837 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1838 void *arg) 1839 { 1840 struct snd_seq_queue_client *info = arg; 1841 int err; 1842 1843 if (info->used >= 0) { 1844 err = snd_seq_queue_use(info->queue, client->number, info->used); 1845 if (err < 0) 1846 return err; 1847 } 1848 1849 return snd_seq_ioctl_get_queue_client(client, arg); 1850 } 1851 1852 1853 /* GET_CLIENT_POOL ioctl() */ 1854 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1855 void *arg) 1856 { 1857 struct snd_seq_client_pool *info = arg; 1858 struct snd_seq_client *cptr; 1859 1860 cptr = snd_seq_client_use_ptr(info->client); 1861 if (cptr == NULL) 1862 return -ENOENT; 1863 memset(info, 0, sizeof(*info)); 1864 info->client = cptr->number; 1865 info->output_pool = cptr->pool->size; 1866 info->output_room = cptr->pool->room; 1867 info->output_free = info->output_pool; 1868 info->output_free = snd_seq_unused_cells(cptr->pool); 1869 if (cptr->type == USER_CLIENT) { 1870 info->input_pool = cptr->data.user.fifo_pool_size; 1871 info->input_free = info->input_pool; 1872 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo); 1873 } else { 1874 info->input_pool = 0; 1875 info->input_free = 0; 1876 } 1877 snd_seq_client_unlock(cptr); 1878 1879 return 0; 1880 } 1881 1882 /* SET_CLIENT_POOL ioctl() */ 1883 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1884 void *arg) 1885 { 1886 struct snd_seq_client_pool *info = arg; 1887 int rc; 1888 1889 if (client->number != info->client) 1890 return -EINVAL; /* can't change other clients */ 1891 1892 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS && 1893 (! snd_seq_write_pool_allocated(client) || 1894 info->output_pool != client->pool->size)) { 1895 if (snd_seq_write_pool_allocated(client)) { 1896 /* is the pool in use? */ 1897 if (atomic_read(&client->pool->counter)) 1898 return -EBUSY; 1899 /* remove all existing cells */ 1900 snd_seq_pool_mark_closing(client->pool); 1901 snd_seq_pool_done(client->pool); 1902 } 1903 client->pool->size = info->output_pool; 1904 rc = snd_seq_pool_init(client->pool); 1905 if (rc < 0) 1906 return rc; 1907 } 1908 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1909 info->input_pool >= 1 && 1910 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1911 info->input_pool != client->data.user.fifo_pool_size) { 1912 /* change pool size */ 1913 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool); 1914 if (rc < 0) 1915 return rc; 1916 client->data.user.fifo_pool_size = info->input_pool; 1917 } 1918 if (info->output_room >= 1 && 1919 info->output_room <= client->pool->size) { 1920 client->pool->room = info->output_room; 1921 } 1922 1923 return snd_seq_ioctl_get_client_pool(client, arg); 1924 } 1925 1926 1927 /* REMOVE_EVENTS ioctl() */ 1928 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1929 void *arg) 1930 { 1931 struct snd_seq_remove_events *info = arg; 1932 1933 /* 1934 * Input mostly not implemented XXX. 1935 */ 1936 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1937 /* 1938 * No restrictions so for a user client we can clear 1939 * the whole fifo 1940 */ 1941 if (client->type == USER_CLIENT && client->data.user.fifo) 1942 snd_seq_fifo_clear(client->data.user.fifo); 1943 } 1944 1945 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1946 snd_seq_queue_remove_cells(client->number, info); 1947 1948 return 0; 1949 } 1950 1951 1952 /* 1953 * get subscription info 1954 */ 1955 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1956 void *arg) 1957 { 1958 struct snd_seq_port_subscribe *subs = arg; 1959 int result; 1960 struct snd_seq_client *sender = NULL; 1961 struct snd_seq_client_port *sport = NULL; 1962 1963 result = -EINVAL; 1964 sender = snd_seq_client_use_ptr(subs->sender.client); 1965 if (!sender) 1966 goto __end; 1967 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1968 if (!sport) 1969 goto __end; 1970 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest, 1971 subs); 1972 __end: 1973 if (sport) 1974 snd_seq_port_unlock(sport); 1975 if (sender) 1976 snd_seq_client_unlock(sender); 1977 1978 return result; 1979 } 1980 1981 1982 /* 1983 * get subscription info - check only its presence 1984 */ 1985 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg) 1986 { 1987 struct snd_seq_query_subs *subs = arg; 1988 int result = -ENXIO; 1989 struct snd_seq_client *cptr = NULL; 1990 struct snd_seq_client_port *port = NULL; 1991 struct snd_seq_port_subs_info *group; 1992 struct list_head *p; 1993 int i; 1994 1995 cptr = snd_seq_client_use_ptr(subs->root.client); 1996 if (!cptr) 1997 goto __end; 1998 port = snd_seq_port_use_ptr(cptr, subs->root.port); 1999 if (!port) 2000 goto __end; 2001 2002 switch (subs->type) { 2003 case SNDRV_SEQ_QUERY_SUBS_READ: 2004 group = &port->c_src; 2005 break; 2006 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2007 group = &port->c_dest; 2008 break; 2009 default: 2010 goto __end; 2011 } 2012 2013 down_read(&group->list_mutex); 2014 /* search for the subscriber */ 2015 subs->num_subs = group->count; 2016 i = 0; 2017 result = -ENOENT; 2018 list_for_each(p, &group->list_head) { 2019 if (i++ == subs->index) { 2020 /* found! */ 2021 struct snd_seq_subscribers *s; 2022 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) { 2023 s = list_entry(p, struct snd_seq_subscribers, src_list); 2024 subs->addr = s->info.dest; 2025 } else { 2026 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2027 subs->addr = s->info.sender; 2028 } 2029 subs->flags = s->info.flags; 2030 subs->queue = s->info.queue; 2031 result = 0; 2032 break; 2033 } 2034 } 2035 up_read(&group->list_mutex); 2036 2037 __end: 2038 if (port) 2039 snd_seq_port_unlock(port); 2040 if (cptr) 2041 snd_seq_client_unlock(cptr); 2042 2043 return result; 2044 } 2045 2046 2047 /* 2048 * query next client 2049 */ 2050 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2051 void *arg) 2052 { 2053 struct snd_seq_client_info *info = arg; 2054 struct snd_seq_client *cptr = NULL; 2055 2056 /* search for next client */ 2057 if (info->client < INT_MAX) 2058 info->client++; 2059 if (info->client < 0) 2060 info->client = 0; 2061 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) { 2062 cptr = snd_seq_client_use_ptr(info->client); 2063 if (cptr) 2064 break; /* found */ 2065 } 2066 if (cptr == NULL) 2067 return -ENOENT; 2068 2069 get_client_info(cptr, info); 2070 snd_seq_client_unlock(cptr); 2071 2072 return 0; 2073 } 2074 2075 /* 2076 * query next port 2077 */ 2078 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2079 void *arg) 2080 { 2081 struct snd_seq_port_info *info = arg; 2082 struct snd_seq_client *cptr; 2083 struct snd_seq_client_port *port = NULL; 2084 2085 cptr = snd_seq_client_use_ptr(info->addr.client); 2086 if (cptr == NULL) 2087 return -ENXIO; 2088 2089 /* search for next port */ 2090 info->addr.port++; 2091 port = snd_seq_port_query_nearest(cptr, info); 2092 if (port == NULL) { 2093 snd_seq_client_unlock(cptr); 2094 return -ENOENT; 2095 } 2096 2097 /* get port info */ 2098 info->addr = port->addr; 2099 snd_seq_get_port_info(port, info); 2100 snd_seq_port_unlock(port); 2101 snd_seq_client_unlock(cptr); 2102 2103 return 0; 2104 } 2105 2106 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2107 #define NUM_UMP_INFOS (SNDRV_UMP_MAX_BLOCKS + 1) 2108 2109 static void free_ump_info(struct snd_seq_client *client) 2110 { 2111 int i; 2112 2113 if (!client->ump_info) 2114 return; 2115 for (i = 0; i < NUM_UMP_INFOS; i++) 2116 kfree(client->ump_info[i]); 2117 kfree(client->ump_info); 2118 client->ump_info = NULL; 2119 } 2120 2121 static void terminate_ump_info_strings(void *p, int type) 2122 { 2123 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) { 2124 struct snd_ump_endpoint_info *ep = p; 2125 ep->name[sizeof(ep->name) - 1] = 0; 2126 } else { 2127 struct snd_ump_block_info *bp = p; 2128 bp->name[sizeof(bp->name) - 1] = 0; 2129 } 2130 } 2131 2132 #ifdef CONFIG_SND_PROC_FS 2133 static void dump_ump_info(struct snd_info_buffer *buffer, 2134 struct snd_seq_client *client) 2135 { 2136 struct snd_ump_endpoint_info *ep; 2137 struct snd_ump_block_info *bp; 2138 int i; 2139 2140 if (!client->ump_info) 2141 return; 2142 ep = client->ump_info[SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT]; 2143 if (ep && *ep->name) 2144 snd_iprintf(buffer, " UMP Endpoint: \"%s\"\n", ep->name); 2145 for (i = 0; i < SNDRV_UMP_MAX_BLOCKS; i++) { 2146 bp = client->ump_info[i + 1]; 2147 if (bp && *bp->name) { 2148 snd_iprintf(buffer, " UMP Block %d: \"%s\" [%s]\n", 2149 i, bp->name, 2150 bp->active ? "Active" : "Inactive"); 2151 snd_iprintf(buffer, " Groups: %d-%d\n", 2152 bp->first_group + 1, 2153 bp->first_group + bp->num_groups); 2154 } 2155 } 2156 } 2157 #endif 2158 2159 /* UMP-specific ioctls -- called directly without data copy */ 2160 static int snd_seq_ioctl_client_ump_info(struct snd_seq_client *caller, 2161 unsigned int cmd, 2162 unsigned long arg) 2163 { 2164 struct snd_seq_client_ump_info __user *argp = 2165 (struct snd_seq_client_ump_info __user *)arg; 2166 struct snd_seq_client *cptr; 2167 int client, type, err = 0; 2168 size_t size; 2169 void *p; 2170 2171 if (get_user(client, &argp->client) || get_user(type, &argp->type)) 2172 return -EFAULT; 2173 if (cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO && 2174 caller->number != client) 2175 return -EPERM; 2176 if (type < 0 || type >= NUM_UMP_INFOS) 2177 return -EINVAL; 2178 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) 2179 size = sizeof(struct snd_ump_endpoint_info); 2180 else 2181 size = sizeof(struct snd_ump_block_info); 2182 cptr = snd_seq_client_use_ptr(client); 2183 if (!cptr) 2184 return -ENOENT; 2185 2186 mutex_lock(&cptr->ioctl_mutex); 2187 if (!cptr->midi_version) { 2188 err = -EBADFD; 2189 goto error; 2190 } 2191 2192 if (cmd == SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO) { 2193 if (!cptr->ump_info) 2194 p = NULL; 2195 else 2196 p = cptr->ump_info[type]; 2197 if (!p) { 2198 err = -ENODEV; 2199 goto error; 2200 } 2201 if (copy_to_user(argp->info, p, size)) { 2202 err = -EFAULT; 2203 goto error; 2204 } 2205 } else { 2206 if (cptr->type != USER_CLIENT) { 2207 err = -EBADFD; 2208 goto error; 2209 } 2210 if (!cptr->ump_info) { 2211 cptr->ump_info = kcalloc(NUM_UMP_INFOS, 2212 sizeof(void *), GFP_KERNEL); 2213 if (!cptr->ump_info) { 2214 err = -ENOMEM; 2215 goto error; 2216 } 2217 } 2218 p = memdup_user(argp->info, size); 2219 if (IS_ERR(p)) { 2220 err = PTR_ERR(p); 2221 goto error; 2222 } 2223 kfree(cptr->ump_info[type]); 2224 terminate_ump_info_strings(p, type); 2225 cptr->ump_info[type] = p; 2226 } 2227 2228 error: 2229 mutex_unlock(&cptr->ioctl_mutex); 2230 snd_seq_client_unlock(cptr); 2231 return err; 2232 } 2233 #endif 2234 2235 /* -------------------------------------------------------- */ 2236 2237 static const struct ioctl_handler { 2238 unsigned int cmd; 2239 int (*func)(struct snd_seq_client *client, void *arg); 2240 } ioctl_handlers[] = { 2241 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion }, 2242 { SNDRV_SEQ_IOCTL_USER_PVERSION, snd_seq_ioctl_user_pversion }, 2243 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id }, 2244 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2245 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2246 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2247 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2248 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2249 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2250 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2251 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2252 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2253 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2254 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2255 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2256 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2257 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2258 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2259 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2260 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2261 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2262 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2263 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2264 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2265 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2266 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2267 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2268 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2269 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2270 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2271 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2272 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2273 { 0, NULL }, 2274 }; 2275 2276 static long snd_seq_ioctl(struct file *file, unsigned int cmd, 2277 unsigned long arg) 2278 { 2279 struct snd_seq_client *client = file->private_data; 2280 /* To use kernel stack for ioctl data. */ 2281 union { 2282 int pversion; 2283 int client_id; 2284 struct snd_seq_system_info system_info; 2285 struct snd_seq_running_info running_info; 2286 struct snd_seq_client_info client_info; 2287 struct snd_seq_port_info port_info; 2288 struct snd_seq_port_subscribe port_subscribe; 2289 struct snd_seq_queue_info queue_info; 2290 struct snd_seq_queue_status queue_status; 2291 struct snd_seq_queue_tempo tempo; 2292 struct snd_seq_queue_timer queue_timer; 2293 struct snd_seq_queue_client queue_client; 2294 struct snd_seq_client_pool client_pool; 2295 struct snd_seq_remove_events remove_events; 2296 struct snd_seq_query_subs query_subs; 2297 } buf; 2298 const struct ioctl_handler *handler; 2299 unsigned long size; 2300 int err; 2301 2302 if (snd_BUG_ON(!client)) 2303 return -ENXIO; 2304 2305 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2306 /* exception - handling large data */ 2307 switch (cmd) { 2308 case SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO: 2309 case SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO: 2310 return snd_seq_ioctl_client_ump_info(client, cmd, arg); 2311 } 2312 #endif 2313 2314 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2315 if (handler->cmd == cmd) 2316 break; 2317 } 2318 if (handler->cmd == 0) 2319 return -ENOTTY; 2320 2321 memset(&buf, 0, sizeof(buf)); 2322 2323 /* 2324 * All of ioctl commands for ALSA sequencer get an argument of size 2325 * within 13 bits. We can safely pick up the size from the command. 2326 */ 2327 size = _IOC_SIZE(handler->cmd); 2328 if (handler->cmd & IOC_IN) { 2329 if (copy_from_user(&buf, (const void __user *)arg, size)) 2330 return -EFAULT; 2331 } 2332 2333 mutex_lock(&client->ioctl_mutex); 2334 err = handler->func(client, &buf); 2335 mutex_unlock(&client->ioctl_mutex); 2336 if (err >= 0) { 2337 /* Some commands includes a bug in 'dir' field. */ 2338 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT || 2339 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL || 2340 (handler->cmd & IOC_OUT)) 2341 if (copy_to_user((void __user *)arg, &buf, size)) 2342 return -EFAULT; 2343 } 2344 2345 return err; 2346 } 2347 2348 #ifdef CONFIG_COMPAT 2349 #include "seq_compat.c" 2350 #else 2351 #define snd_seq_ioctl_compat NULL 2352 #endif 2353 2354 /* -------------------------------------------------------- */ 2355 2356 2357 /* exported to kernel modules */ 2358 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2359 const char *name_fmt, ...) 2360 { 2361 struct snd_seq_client *client; 2362 va_list args; 2363 2364 if (snd_BUG_ON(in_interrupt())) 2365 return -EBUSY; 2366 2367 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2368 return -EINVAL; 2369 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2370 return -EINVAL; 2371 2372 mutex_lock(®ister_mutex); 2373 2374 if (card) { 2375 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2376 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2377 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2378 client_index = -1; 2379 } 2380 2381 /* empty write queue as default */ 2382 client = seq_create_client1(client_index, 0); 2383 if (client == NULL) { 2384 mutex_unlock(®ister_mutex); 2385 return -EBUSY; /* failure code */ 2386 } 2387 usage_alloc(&client_usage, 1); 2388 2389 client->accept_input = 1; 2390 client->accept_output = 1; 2391 client->data.kernel.card = card; 2392 client->user_pversion = SNDRV_SEQ_VERSION; 2393 2394 va_start(args, name_fmt); 2395 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2396 va_end(args); 2397 2398 client->type = KERNEL_CLIENT; 2399 mutex_unlock(®ister_mutex); 2400 2401 /* make others aware this new client */ 2402 snd_seq_system_client_ev_client_start(client->number); 2403 2404 /* return client number to caller */ 2405 return client->number; 2406 } 2407 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2408 2409 /* exported to kernel modules */ 2410 int snd_seq_delete_kernel_client(int client) 2411 { 2412 struct snd_seq_client *ptr; 2413 2414 if (snd_BUG_ON(in_interrupt())) 2415 return -EBUSY; 2416 2417 ptr = clientptr(client); 2418 if (ptr == NULL) 2419 return -EINVAL; 2420 2421 seq_free_client(ptr); 2422 kfree(ptr); 2423 return 0; 2424 } 2425 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2426 2427 /* 2428 * exported, called by kernel clients to enqueue events (w/o blocking) 2429 * 2430 * RETURN VALUE: zero if succeed, negative if error 2431 */ 2432 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, 2433 struct file *file, bool blocking) 2434 { 2435 struct snd_seq_client *cptr; 2436 int result; 2437 2438 if (snd_BUG_ON(!ev)) 2439 return -EINVAL; 2440 2441 if (!snd_seq_ev_is_ump(ev)) { 2442 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2443 return 0; /* ignore this */ 2444 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2445 return -EINVAL; /* quoted events can't be enqueued */ 2446 } 2447 2448 /* fill in client number */ 2449 ev->source.client = client; 2450 2451 if (check_event_type_and_length(ev)) 2452 return -EINVAL; 2453 2454 cptr = snd_seq_client_use_ptr(client); 2455 if (cptr == NULL) 2456 return -EINVAL; 2457 2458 if (!cptr->accept_output) { 2459 result = -EPERM; 2460 } else { /* send it */ 2461 mutex_lock(&cptr->ioctl_mutex); 2462 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, 2463 false, 0, 2464 &cptr->ioctl_mutex); 2465 mutex_unlock(&cptr->ioctl_mutex); 2466 } 2467 2468 snd_seq_client_unlock(cptr); 2469 return result; 2470 } 2471 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2472 2473 /* 2474 * exported, called by kernel clients to dispatch events directly to other 2475 * clients, bypassing the queues. Event time-stamp will be updated. 2476 * 2477 * RETURN VALUE: negative = delivery failed, 2478 * zero, or positive: the number of delivered events 2479 */ 2480 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2481 int atomic, int hop) 2482 { 2483 struct snd_seq_client *cptr; 2484 int result; 2485 2486 if (snd_BUG_ON(!ev)) 2487 return -EINVAL; 2488 2489 /* fill in client number */ 2490 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2491 ev->source.client = client; 2492 2493 if (check_event_type_and_length(ev)) 2494 return -EINVAL; 2495 2496 cptr = snd_seq_client_use_ptr(client); 2497 if (cptr == NULL) 2498 return -EINVAL; 2499 2500 if (!cptr->accept_output) 2501 result = -EPERM; 2502 else 2503 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2504 2505 snd_seq_client_unlock(cptr); 2506 return result; 2507 } 2508 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2509 2510 /** 2511 * snd_seq_kernel_client_ctl - operate a command for a client with data in 2512 * kernel space. 2513 * @clientid: A numerical ID for a client. 2514 * @cmd: An ioctl(2) command for ALSA sequencer operation. 2515 * @arg: A pointer to data in kernel space. 2516 * 2517 * Against its name, both kernel/application client can be handled by this 2518 * kernel API. A pointer of 'arg' argument should be in kernel space. 2519 * 2520 * Return: 0 at success. Negative error code at failure. 2521 */ 2522 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2523 { 2524 const struct ioctl_handler *handler; 2525 struct snd_seq_client *client; 2526 2527 client = clientptr(clientid); 2528 if (client == NULL) 2529 return -ENXIO; 2530 2531 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2532 if (handler->cmd == cmd) 2533 return handler->func(client, arg); 2534 } 2535 2536 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2537 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2538 return -ENOTTY; 2539 } 2540 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2541 2542 /* exported (for OSS emulator) */ 2543 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2544 { 2545 struct snd_seq_client *client; 2546 2547 client = clientptr(clientid); 2548 if (client == NULL) 2549 return -ENXIO; 2550 2551 if (! snd_seq_write_pool_allocated(client)) 2552 return 1; 2553 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2554 return 1; 2555 return 0; 2556 } 2557 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2558 2559 /* get a sequencer client object; for internal use from a kernel client */ 2560 struct snd_seq_client *snd_seq_kernel_client_get(int id) 2561 { 2562 return snd_seq_client_use_ptr(id); 2563 } 2564 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_get); 2565 2566 /* put a sequencer client object; for internal use from a kernel client */ 2567 void snd_seq_kernel_client_put(struct snd_seq_client *cptr) 2568 { 2569 if (cptr) 2570 snd_seq_client_unlock(cptr); 2571 } 2572 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_put); 2573 2574 /*---------------------------------------------------------------------------*/ 2575 2576 #ifdef CONFIG_SND_PROC_FS 2577 /* 2578 * /proc interface 2579 */ 2580 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2581 struct snd_seq_port_subs_info *group, 2582 int is_src, char *msg) 2583 { 2584 struct list_head *p; 2585 struct snd_seq_subscribers *s; 2586 int count = 0; 2587 2588 down_read(&group->list_mutex); 2589 if (list_empty(&group->list_head)) { 2590 up_read(&group->list_mutex); 2591 return; 2592 } 2593 snd_iprintf(buffer, msg); 2594 list_for_each(p, &group->list_head) { 2595 if (is_src) 2596 s = list_entry(p, struct snd_seq_subscribers, src_list); 2597 else 2598 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2599 if (count++) 2600 snd_iprintf(buffer, ", "); 2601 snd_iprintf(buffer, "%d:%d", 2602 is_src ? s->info.dest.client : s->info.sender.client, 2603 is_src ? s->info.dest.port : s->info.sender.port); 2604 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2605 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2606 if (group->exclusive) 2607 snd_iprintf(buffer, "[ex]"); 2608 } 2609 up_read(&group->list_mutex); 2610 snd_iprintf(buffer, "\n"); 2611 } 2612 2613 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2614 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2615 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2616 2617 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2618 2619 static const char *port_direction_name(unsigned char dir) 2620 { 2621 static const char *names[4] = { 2622 "-", "In", "Out", "In/Out" 2623 }; 2624 2625 if (dir > SNDRV_SEQ_PORT_DIR_BIDIRECTION) 2626 return "Invalid"; 2627 return names[dir]; 2628 } 2629 2630 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2631 struct snd_seq_client *client) 2632 { 2633 struct snd_seq_client_port *p; 2634 2635 mutex_lock(&client->ports_mutex); 2636 list_for_each_entry(p, &client->ports_list_head, list) { 2637 if (p->capability & SNDRV_SEQ_PORT_CAP_INACTIVE) 2638 continue; 2639 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c) [%s]\n", 2640 p->addr.port, p->name, 2641 FLAG_PERM_RD(p->capability), 2642 FLAG_PERM_WR(p->capability), 2643 FLAG_PERM_EX(p->capability), 2644 FLAG_PERM_DUPLEX(p->capability), 2645 port_direction_name(p->direction)); 2646 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2647 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2648 } 2649 mutex_unlock(&client->ports_mutex); 2650 } 2651 2652 static const char *midi_version_string(unsigned int version) 2653 { 2654 switch (version) { 2655 case SNDRV_SEQ_CLIENT_LEGACY_MIDI: 2656 return "Legacy"; 2657 case SNDRV_SEQ_CLIENT_UMP_MIDI_1_0: 2658 return "UMP MIDI1"; 2659 case SNDRV_SEQ_CLIENT_UMP_MIDI_2_0: 2660 return "UMP MIDI2"; 2661 default: 2662 return "Unknown"; 2663 } 2664 } 2665 2666 /* exported to seq_info.c */ 2667 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2668 struct snd_info_buffer *buffer) 2669 { 2670 int c; 2671 struct snd_seq_client *client; 2672 2673 snd_iprintf(buffer, "Client info\n"); 2674 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2675 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2676 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2677 snd_iprintf(buffer, "\n"); 2678 2679 /* list the client table */ 2680 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2681 client = snd_seq_client_use_ptr(c); 2682 if (client == NULL) 2683 continue; 2684 if (client->type == NO_CLIENT) { 2685 snd_seq_client_unlock(client); 2686 continue; 2687 } 2688 2689 snd_iprintf(buffer, "Client %3d : \"%s\" [%s %s]\n", 2690 c, client->name, 2691 client->type == USER_CLIENT ? "User" : "Kernel", 2692 midi_version_string(client->midi_version)); 2693 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2694 dump_ump_info(buffer, client); 2695 #endif 2696 snd_seq_info_dump_ports(buffer, client); 2697 if (snd_seq_write_pool_allocated(client)) { 2698 snd_iprintf(buffer, " Output pool :\n"); 2699 snd_seq_info_pool(buffer, client->pool, " "); 2700 } 2701 if (client->type == USER_CLIENT && client->data.user.fifo && 2702 client->data.user.fifo->pool) { 2703 snd_iprintf(buffer, " Input pool :\n"); 2704 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2705 } 2706 snd_seq_client_unlock(client); 2707 } 2708 } 2709 #endif /* CONFIG_SND_PROC_FS */ 2710 2711 /*---------------------------------------------------------------------------*/ 2712 2713 2714 /* 2715 * REGISTRATION PART 2716 */ 2717 2718 static const struct file_operations snd_seq_f_ops = 2719 { 2720 .owner = THIS_MODULE, 2721 .read = snd_seq_read, 2722 .write = snd_seq_write, 2723 .open = snd_seq_open, 2724 .release = snd_seq_release, 2725 .llseek = no_llseek, 2726 .poll = snd_seq_poll, 2727 .unlocked_ioctl = snd_seq_ioctl, 2728 .compat_ioctl = snd_seq_ioctl_compat, 2729 }; 2730 2731 static struct device *seq_dev; 2732 2733 /* 2734 * register sequencer device 2735 */ 2736 int __init snd_sequencer_device_init(void) 2737 { 2738 int err; 2739 2740 err = snd_device_alloc(&seq_dev, NULL); 2741 if (err < 0) 2742 return err; 2743 dev_set_name(seq_dev, "seq"); 2744 2745 mutex_lock(®ister_mutex); 2746 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2747 &snd_seq_f_ops, NULL, seq_dev); 2748 mutex_unlock(®ister_mutex); 2749 if (err < 0) { 2750 put_device(seq_dev); 2751 return err; 2752 } 2753 2754 return 0; 2755 } 2756 2757 2758 2759 /* 2760 * unregister sequencer device 2761 */ 2762 void snd_sequencer_device_done(void) 2763 { 2764 snd_unregister_device(seq_dev); 2765 put_device(seq_dev); 2766 } 2767