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