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 || (fifo = client->data.user.fifo) == NULL) 420 return -ENXIO; 421 422 if (atomic_read(&fifo->overflow) > 0) { 423 /* buffer overflow is detected */ 424 snd_seq_fifo_clear(fifo); 425 /* return error code */ 426 return -ENOSPC; 427 } 428 429 cell = NULL; 430 err = 0; 431 snd_seq_fifo_lock(fifo); 432 433 /* while data available in queue */ 434 while (count >= sizeof(struct snd_seq_event)) { 435 int nonblock; 436 437 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 438 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) { 439 break; 440 } 441 if (snd_seq_ev_is_variable(&cell->event)) { 442 struct snd_seq_event tmpev; 443 tmpev = cell->event; 444 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 445 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) { 446 err = -EFAULT; 447 break; 448 } 449 count -= sizeof(struct snd_seq_event); 450 buf += sizeof(struct snd_seq_event); 451 err = snd_seq_expand_var_event(&cell->event, count, 452 (char __force *)buf, 0, 453 sizeof(struct snd_seq_event)); 454 if (err < 0) 455 break; 456 result += err; 457 count -= err; 458 buf += err; 459 } else { 460 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) { 461 err = -EFAULT; 462 break; 463 } 464 count -= sizeof(struct snd_seq_event); 465 buf += sizeof(struct snd_seq_event); 466 } 467 snd_seq_cell_free(cell); 468 cell = NULL; /* to be sure */ 469 result += sizeof(struct snd_seq_event); 470 } 471 472 if (err < 0) { 473 if (cell) 474 snd_seq_fifo_cell_putback(fifo, cell); 475 if (err == -EAGAIN && result > 0) 476 err = 0; 477 } 478 snd_seq_fifo_unlock(fifo); 479 480 return (err < 0) ? err : result; 481 } 482 483 484 /* 485 * check access permission to the port 486 */ 487 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 488 { 489 if ((port->capability & flags) != flags) 490 return 0; 491 return flags; 492 } 493 494 /* 495 * check if the destination client is available, and return the pointer 496 * if filter is non-zero, client filter bitmap is tested. 497 */ 498 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event, 499 int filter) 500 { 501 struct snd_seq_client *dest; 502 503 dest = snd_seq_client_use_ptr(event->dest.client); 504 if (dest == NULL) 505 return NULL; 506 if (! dest->accept_input) 507 goto __not_avail; 508 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 509 ! test_bit(event->type, dest->event_filter)) 510 goto __not_avail; 511 if (filter && !(dest->filter & filter)) 512 goto __not_avail; 513 514 return dest; /* ok - accessible */ 515 __not_avail: 516 snd_seq_client_unlock(dest); 517 return NULL; 518 } 519 520 521 /* 522 * Return the error event. 523 * 524 * If the receiver client is a user client, the original event is 525 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 526 * the original event is also variable length, the external data is 527 * copied after the event record. 528 * If the receiver client is a kernel client, the original event is 529 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 530 * kmalloc. 531 */ 532 static int bounce_error_event(struct snd_seq_client *client, 533 struct snd_seq_event *event, 534 int err, int atomic, int hop) 535 { 536 struct snd_seq_event bounce_ev; 537 int result; 538 539 if (client == NULL || 540 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 541 ! client->accept_input) 542 return 0; /* ignored */ 543 544 /* set up quoted error */ 545 memset(&bounce_ev, 0, sizeof(bounce_ev)); 546 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 547 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 548 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 549 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 550 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 551 bounce_ev.dest.client = client->number; 552 bounce_ev.dest.port = event->source.port; 553 bounce_ev.data.quote.origin = event->dest; 554 bounce_ev.data.quote.event = event; 555 bounce_ev.data.quote.value = -err; /* use positive value */ 556 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 557 if (result < 0) { 558 client->event_lost++; 559 return result; 560 } 561 562 return result; 563 } 564 565 566 /* 567 * rewrite the time-stamp of the event record with the curren time 568 * of the given queue. 569 * return non-zero if updated. 570 */ 571 static int update_timestamp_of_queue(struct snd_seq_event *event, 572 int queue, int real_time) 573 { 574 struct snd_seq_queue *q; 575 576 q = queueptr(queue); 577 if (! q) 578 return 0; 579 event->queue = queue; 580 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 581 if (real_time) { 582 event->time.time = snd_seq_timer_get_cur_time(q->timer, true); 583 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 584 } else { 585 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 586 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 587 } 588 queuefree(q); 589 return 1; 590 } 591 592 593 /* 594 * deliver an event to the specified destination. 595 * if filter is non-zero, client filter bitmap is tested. 596 * 597 * RETURN VALUE: 0 : if succeeded 598 * <0 : error 599 */ 600 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 601 struct snd_seq_event *event, 602 int filter, int atomic, int hop) 603 { 604 struct snd_seq_client *dest = NULL; 605 struct snd_seq_client_port *dest_port = NULL; 606 int result = -ENOENT; 607 int direct; 608 609 direct = snd_seq_ev_is_direct(event); 610 611 dest = get_event_dest_client(event, filter); 612 if (dest == NULL) 613 goto __skip; 614 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 615 if (dest_port == NULL) 616 goto __skip; 617 618 /* check permission */ 619 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 620 result = -EPERM; 621 goto __skip; 622 } 623 624 if (dest_port->timestamping) 625 update_timestamp_of_queue(event, dest_port->time_queue, 626 dest_port->time_real); 627 628 switch (dest->type) { 629 case USER_CLIENT: 630 if (dest->data.user.fifo) 631 result = snd_seq_fifo_event_in(dest->data.user.fifo, event); 632 break; 633 634 case KERNEL_CLIENT: 635 if (dest_port->event_input == NULL) 636 break; 637 result = dest_port->event_input(event, direct, 638 dest_port->private_data, 639 atomic, hop); 640 break; 641 default: 642 break; 643 } 644 645 __skip: 646 if (dest_port) 647 snd_seq_port_unlock(dest_port); 648 if (dest) 649 snd_seq_client_unlock(dest); 650 651 if (result < 0 && !direct) { 652 result = bounce_error_event(client, event, result, atomic, hop); 653 } 654 return result; 655 } 656 657 658 /* 659 * send the event to all subscribers: 660 */ 661 static int deliver_to_subscribers(struct snd_seq_client *client, 662 struct snd_seq_event *event, 663 int atomic, int hop) 664 { 665 struct snd_seq_subscribers *subs; 666 int err, result = 0, num_ev = 0; 667 struct snd_seq_event event_saved; 668 struct snd_seq_client_port *src_port; 669 struct snd_seq_port_subs_info *grp; 670 671 src_port = snd_seq_port_use_ptr(client, event->source.port); 672 if (src_port == NULL) 673 return -EINVAL; /* invalid source port */ 674 /* save original event record */ 675 event_saved = *event; 676 grp = &src_port->c_src; 677 678 /* lock list */ 679 if (atomic) 680 read_lock(&grp->list_lock); 681 else 682 down_read_nested(&grp->list_mutex, hop); 683 list_for_each_entry(subs, &grp->list_head, src_list) { 684 /* both ports ready? */ 685 if (atomic_read(&subs->ref_count) != 2) 686 continue; 687 event->dest = subs->info.dest; 688 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 689 /* convert time according to flag with subscription */ 690 update_timestamp_of_queue(event, subs->info.queue, 691 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 692 err = snd_seq_deliver_single_event(client, event, 693 0, atomic, hop); 694 if (err < 0) { 695 /* save first error that occurs and continue */ 696 if (!result) 697 result = err; 698 continue; 699 } 700 num_ev++; 701 /* restore original event record */ 702 *event = event_saved; 703 } 704 if (atomic) 705 read_unlock(&grp->list_lock); 706 else 707 up_read(&grp->list_mutex); 708 *event = event_saved; /* restore */ 709 snd_seq_port_unlock(src_port); 710 return (result < 0) ? result : num_ev; 711 } 712 713 714 #ifdef SUPPORT_BROADCAST 715 /* 716 * broadcast to all ports: 717 */ 718 static int port_broadcast_event(struct snd_seq_client *client, 719 struct snd_seq_event *event, 720 int atomic, int hop) 721 { 722 int num_ev = 0, err, result = 0; 723 struct snd_seq_client *dest_client; 724 struct snd_seq_client_port *port; 725 726 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 727 if (dest_client == NULL) 728 return 0; /* no matching destination */ 729 730 read_lock(&dest_client->ports_lock); 731 list_for_each_entry(port, &dest_client->ports_list_head, list) { 732 event->dest.port = port->addr.port; 733 /* pass NULL as source client to avoid error bounce */ 734 err = snd_seq_deliver_single_event(NULL, event, 735 SNDRV_SEQ_FILTER_BROADCAST, 736 atomic, hop); 737 if (err < 0) { 738 /* save first error that occurs and continue */ 739 if (!result) 740 result = err; 741 continue; 742 } 743 num_ev++; 744 } 745 read_unlock(&dest_client->ports_lock); 746 snd_seq_client_unlock(dest_client); 747 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ 748 return (result < 0) ? result : num_ev; 749 } 750 751 /* 752 * send the event to all clients: 753 * if destination port is also ADDRESS_BROADCAST, deliver to all ports. 754 */ 755 static int broadcast_event(struct snd_seq_client *client, 756 struct snd_seq_event *event, int atomic, int hop) 757 { 758 int err, result = 0, num_ev = 0; 759 int dest; 760 struct snd_seq_addr addr; 761 762 addr = event->dest; /* save */ 763 764 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) { 765 /* don't send to itself */ 766 if (dest == client->number) 767 continue; 768 event->dest.client = dest; 769 event->dest.port = addr.port; 770 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST) 771 err = port_broadcast_event(client, event, atomic, hop); 772 else 773 /* pass NULL as source client to avoid error bounce */ 774 err = snd_seq_deliver_single_event(NULL, event, 775 SNDRV_SEQ_FILTER_BROADCAST, 776 atomic, hop); 777 if (err < 0) { 778 /* save first error that occurs and continue */ 779 if (!result) 780 result = err; 781 continue; 782 } 783 num_ev += err; 784 } 785 event->dest = addr; /* restore */ 786 return (result < 0) ? result : num_ev; 787 } 788 789 790 /* multicast - not supported yet */ 791 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event, 792 int atomic, int hop) 793 { 794 pr_debug("ALSA: seq: multicast not supported yet.\n"); 795 return 0; /* ignored */ 796 } 797 #endif /* SUPPORT_BROADCAST */ 798 799 800 /* deliver an event to the destination port(s). 801 * if the event is to subscribers or broadcast, the event is dispatched 802 * to multiple targets. 803 * 804 * RETURN VALUE: n > 0 : the number of delivered events. 805 * n == 0 : the event was not passed to any client. 806 * n < 0 : error - event was not processed. 807 */ 808 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 809 int atomic, int hop) 810 { 811 int result; 812 813 hop++; 814 if (hop >= SNDRV_SEQ_MAX_HOPS) { 815 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 816 event->source.client, event->source.port, 817 event->dest.client, event->dest.port); 818 return -EMLINK; 819 } 820 821 if (snd_seq_ev_is_variable(event) && 822 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR))) 823 return -EINVAL; 824 825 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 826 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 827 result = deliver_to_subscribers(client, event, atomic, hop); 828 #ifdef SUPPORT_BROADCAST 829 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST || 830 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST) 831 result = broadcast_event(client, event, atomic, hop); 832 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS) 833 result = multicast_event(client, event, atomic, hop); 834 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST) 835 result = port_broadcast_event(client, event, atomic, hop); 836 #endif 837 else 838 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 839 840 return result; 841 } 842 843 /* 844 * dispatch an event cell: 845 * This function is called only from queue check routines in timer 846 * interrupts or after enqueued. 847 * The event cell shall be released or re-queued in this function. 848 * 849 * RETURN VALUE: n > 0 : the number of delivered events. 850 * n == 0 : the event was not passed to any client. 851 * n < 0 : error - event was not processed. 852 */ 853 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 854 { 855 struct snd_seq_client *client; 856 int result; 857 858 if (snd_BUG_ON(!cell)) 859 return -EINVAL; 860 861 client = snd_seq_client_use_ptr(cell->event.source.client); 862 if (client == NULL) { 863 snd_seq_cell_free(cell); /* release this cell */ 864 return -EINVAL; 865 } 866 867 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 868 /* NOTE event: 869 * the event cell is re-used as a NOTE-OFF event and 870 * enqueued again. 871 */ 872 struct snd_seq_event tmpev, *ev; 873 874 /* reserve this event to enqueue note-off later */ 875 tmpev = cell->event; 876 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 877 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 878 879 /* 880 * This was originally a note event. We now re-use the 881 * cell for the note-off event. 882 */ 883 884 ev = &cell->event; 885 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 886 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 887 888 /* add the duration time */ 889 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 890 case SNDRV_SEQ_TIME_STAMP_TICK: 891 ev->time.tick += ev->data.note.duration; 892 break; 893 case SNDRV_SEQ_TIME_STAMP_REAL: 894 /* unit for duration is ms */ 895 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 896 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 897 ev->time.time.tv_nsec / 1000000000; 898 ev->time.time.tv_nsec %= 1000000000; 899 break; 900 } 901 ev->data.note.velocity = ev->data.note.off_velocity; 902 903 /* Now queue this cell as the note off event */ 904 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 905 snd_seq_cell_free(cell); /* release this cell */ 906 907 } else { 908 /* Normal events: 909 * event cell is freed after processing the event 910 */ 911 912 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 913 snd_seq_cell_free(cell); 914 } 915 916 snd_seq_client_unlock(client); 917 return result; 918 } 919 920 921 /* Allocate a cell from client pool and enqueue it to queue: 922 * if pool is empty and blocking is TRUE, sleep until a new cell is 923 * available. 924 */ 925 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 926 struct snd_seq_event *event, 927 struct file *file, int blocking, 928 int atomic, int hop, 929 struct mutex *mutexp) 930 { 931 struct snd_seq_event_cell *cell; 932 int err; 933 934 /* special queue values - force direct passing */ 935 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 936 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 937 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 938 } else 939 #ifdef SUPPORT_BROADCAST 940 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 941 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 942 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 943 } 944 #endif 945 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 946 /* check presence of source port */ 947 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 948 if (src_port == NULL) 949 return -EINVAL; 950 snd_seq_port_unlock(src_port); 951 } 952 953 /* direct event processing without enqueued */ 954 if (snd_seq_ev_is_direct(event)) { 955 if (event->type == SNDRV_SEQ_EVENT_NOTE) 956 return -EINVAL; /* this event must be enqueued! */ 957 return snd_seq_deliver_event(client, event, atomic, hop); 958 } 959 960 /* Not direct, normal queuing */ 961 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 962 return -EINVAL; /* invalid queue */ 963 if (! snd_seq_write_pool_allocated(client)) 964 return -ENXIO; /* queue is not allocated */ 965 966 /* allocate an event cell */ 967 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, 968 file, mutexp); 969 if (err < 0) 970 return err; 971 972 /* we got a cell. enqueue it. */ 973 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 974 snd_seq_cell_free(cell); 975 return err; 976 } 977 978 return 0; 979 } 980 981 982 /* 983 * check validity of event type and data length. 984 * return non-zero if invalid. 985 */ 986 static int check_event_type_and_length(struct snd_seq_event *ev) 987 { 988 switch (snd_seq_ev_length_type(ev)) { 989 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 990 if (snd_seq_ev_is_variable_type(ev)) 991 return -EINVAL; 992 break; 993 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 994 if (! snd_seq_ev_is_variable_type(ev) || 995 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 996 return -EINVAL; 997 break; 998 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 999 if (! snd_seq_ev_is_direct(ev)) 1000 return -EINVAL; 1001 break; 1002 } 1003 return 0; 1004 } 1005 1006 1007 /* handle write() */ 1008 /* possible error values: 1009 * -ENXIO invalid client or file open mode 1010 * -ENOMEM malloc failed 1011 * -EFAULT seg. fault during copy from user space 1012 * -EINVAL invalid event 1013 * -EAGAIN no space in output pool 1014 * -EINTR interrupts while sleep 1015 * -EMLINK too many hops 1016 * others depends on return value from driver callback 1017 */ 1018 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 1019 size_t count, loff_t *offset) 1020 { 1021 struct snd_seq_client *client = file->private_data; 1022 int written = 0, len; 1023 int err, handled; 1024 struct snd_seq_event event; 1025 1026 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1027 return -ENXIO; 1028 1029 /* check client structures are in place */ 1030 if (snd_BUG_ON(!client)) 1031 return -ENXIO; 1032 1033 if (!client->accept_output || client->pool == NULL) 1034 return -ENXIO; 1035 1036 repeat: 1037 handled = 0; 1038 /* allocate the pool now if the pool is not allocated yet */ 1039 mutex_lock(&client->ioctl_mutex); 1040 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1041 err = snd_seq_pool_init(client->pool); 1042 if (err < 0) 1043 goto out; 1044 } 1045 1046 /* only process whole events */ 1047 err = -EINVAL; 1048 while (count >= sizeof(struct snd_seq_event)) { 1049 /* Read in the event header from the user */ 1050 len = sizeof(event); 1051 if (copy_from_user(&event, buf, len)) { 1052 err = -EFAULT; 1053 break; 1054 } 1055 event.source.client = client->number; /* fill in client number */ 1056 /* Check for extension data length */ 1057 if (check_event_type_and_length(&event)) { 1058 err = -EINVAL; 1059 break; 1060 } 1061 1062 /* check for special events */ 1063 if (event.type == SNDRV_SEQ_EVENT_NONE) 1064 goto __skip_event; 1065 else if (snd_seq_ev_is_reserved(&event)) { 1066 err = -EINVAL; 1067 break; 1068 } 1069 1070 if (snd_seq_ev_is_variable(&event)) { 1071 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1072 if ((size_t)(extlen + len) > count) { 1073 /* back out, will get an error this time or next */ 1074 err = -EINVAL; 1075 break; 1076 } 1077 /* set user space pointer */ 1078 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1079 event.data.ext.ptr = (char __force *)buf 1080 + sizeof(struct snd_seq_event); 1081 len += extlen; /* increment data length */ 1082 } else { 1083 #ifdef CONFIG_COMPAT 1084 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1085 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]); 1086 event.data.ext.ptr = ptr; 1087 } 1088 #endif 1089 } 1090 1091 /* ok, enqueue it */ 1092 err = snd_seq_client_enqueue_event(client, &event, file, 1093 !(file->f_flags & O_NONBLOCK), 1094 0, 0, &client->ioctl_mutex); 1095 if (err < 0) 1096 break; 1097 handled++; 1098 1099 __skip_event: 1100 /* Update pointers and counts */ 1101 count -= len; 1102 buf += len; 1103 written += len; 1104 1105 /* let's have a coffee break if too many events are queued */ 1106 if (++handled >= 200) { 1107 mutex_unlock(&client->ioctl_mutex); 1108 goto repeat; 1109 } 1110 } 1111 1112 out: 1113 mutex_unlock(&client->ioctl_mutex); 1114 return written ? written : err; 1115 } 1116 1117 1118 /* 1119 * handle polling 1120 */ 1121 static __poll_t snd_seq_poll(struct file *file, poll_table * wait) 1122 { 1123 struct snd_seq_client *client = file->private_data; 1124 __poll_t mask = 0; 1125 1126 /* check client structures are in place */ 1127 if (snd_BUG_ON(!client)) 1128 return EPOLLERR; 1129 1130 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1131 client->data.user.fifo) { 1132 1133 /* check if data is available in the outqueue */ 1134 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1135 mask |= EPOLLIN | EPOLLRDNORM; 1136 } 1137 1138 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1139 1140 /* check if data is available in the pool */ 1141 if (!snd_seq_write_pool_allocated(client) || 1142 snd_seq_pool_poll_wait(client->pool, file, wait)) 1143 mask |= EPOLLOUT | EPOLLWRNORM; 1144 } 1145 1146 return mask; 1147 } 1148 1149 1150 /*-----------------------------------------------------*/ 1151 1152 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg) 1153 { 1154 int *pversion = arg; 1155 1156 *pversion = SNDRV_SEQ_VERSION; 1157 return 0; 1158 } 1159 1160 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg) 1161 { 1162 int *client_id = arg; 1163 1164 *client_id = client->number; 1165 return 0; 1166 } 1167 1168 /* SYSTEM_INFO ioctl() */ 1169 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg) 1170 { 1171 struct snd_seq_system_info *info = arg; 1172 1173 memset(info, 0, sizeof(*info)); 1174 /* fill the info fields */ 1175 info->queues = SNDRV_SEQ_MAX_QUEUES; 1176 info->clients = SNDRV_SEQ_MAX_CLIENTS; 1177 info->ports = SNDRV_SEQ_MAX_PORTS; 1178 info->channels = 256; /* fixed limit */ 1179 info->cur_clients = client_usage.cur; 1180 info->cur_queues = snd_seq_queue_get_cur_queues(); 1181 1182 return 0; 1183 } 1184 1185 1186 /* RUNNING_MODE ioctl() */ 1187 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg) 1188 { 1189 struct snd_seq_running_info *info = arg; 1190 struct snd_seq_client *cptr; 1191 int err = 0; 1192 1193 /* requested client number */ 1194 cptr = snd_seq_client_use_ptr(info->client); 1195 if (cptr == NULL) 1196 return -ENOENT; /* don't change !!! */ 1197 1198 #ifdef SNDRV_BIG_ENDIAN 1199 if (!info->big_endian) { 1200 err = -EINVAL; 1201 goto __err; 1202 } 1203 #else 1204 if (info->big_endian) { 1205 err = -EINVAL; 1206 goto __err; 1207 } 1208 1209 #endif 1210 if (info->cpu_mode > sizeof(long)) { 1211 err = -EINVAL; 1212 goto __err; 1213 } 1214 cptr->convert32 = (info->cpu_mode < sizeof(long)); 1215 __err: 1216 snd_seq_client_unlock(cptr); 1217 return err; 1218 } 1219 1220 /* CLIENT_INFO ioctl() */ 1221 static void get_client_info(struct snd_seq_client *cptr, 1222 struct snd_seq_client_info *info) 1223 { 1224 info->client = cptr->number; 1225 1226 /* fill the info fields */ 1227 info->type = cptr->type; 1228 strcpy(info->name, cptr->name); 1229 info->filter = cptr->filter; 1230 info->event_lost = cptr->event_lost; 1231 memcpy(info->event_filter, cptr->event_filter, 32); 1232 info->num_ports = cptr->num_ports; 1233 1234 if (cptr->type == USER_CLIENT) 1235 info->pid = pid_vnr(cptr->data.user.owner); 1236 else 1237 info->pid = -1; 1238 1239 if (cptr->type == KERNEL_CLIENT) 1240 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; 1241 else 1242 info->card = -1; 1243 1244 memset(info->reserved, 0, sizeof(info->reserved)); 1245 } 1246 1247 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1248 void *arg) 1249 { 1250 struct snd_seq_client_info *client_info = arg; 1251 struct snd_seq_client *cptr; 1252 1253 /* requested client number */ 1254 cptr = snd_seq_client_use_ptr(client_info->client); 1255 if (cptr == NULL) 1256 return -ENOENT; /* don't change !!! */ 1257 1258 get_client_info(cptr, client_info); 1259 snd_seq_client_unlock(cptr); 1260 1261 return 0; 1262 } 1263 1264 1265 /* CLIENT_INFO ioctl() */ 1266 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1267 void *arg) 1268 { 1269 struct snd_seq_client_info *client_info = arg; 1270 1271 /* it is not allowed to set the info fields for an another client */ 1272 if (client->number != client_info->client) 1273 return -EPERM; 1274 /* also client type must be set now */ 1275 if (client->type != client_info->type) 1276 return -EINVAL; 1277 1278 /* fill the info fields */ 1279 if (client_info->name[0]) 1280 strscpy(client->name, client_info->name, sizeof(client->name)); 1281 1282 client->filter = client_info->filter; 1283 client->event_lost = client_info->event_lost; 1284 memcpy(client->event_filter, client_info->event_filter, 32); 1285 1286 return 0; 1287 } 1288 1289 1290 /* 1291 * CREATE PORT ioctl() 1292 */ 1293 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg) 1294 { 1295 struct snd_seq_port_info *info = arg; 1296 struct snd_seq_client_port *port; 1297 struct snd_seq_port_callback *callback; 1298 int port_idx; 1299 1300 /* it is not allowed to create the port for an another client */ 1301 if (info->addr.client != client->number) 1302 return -EPERM; 1303 1304 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1); 1305 if (port == NULL) 1306 return -ENOMEM; 1307 1308 if (client->type == USER_CLIENT && info->kernel) { 1309 port_idx = port->addr.port; 1310 snd_seq_port_unlock(port); 1311 snd_seq_delete_port(client, port_idx); 1312 return -EINVAL; 1313 } 1314 if (client->type == KERNEL_CLIENT) { 1315 if ((callback = info->kernel) != NULL) { 1316 if (callback->owner) 1317 port->owner = callback->owner; 1318 port->private_data = callback->private_data; 1319 port->private_free = callback->private_free; 1320 port->event_input = callback->event_input; 1321 port->c_src.open = callback->subscribe; 1322 port->c_src.close = callback->unsubscribe; 1323 port->c_dest.open = callback->use; 1324 port->c_dest.close = callback->unuse; 1325 } 1326 } 1327 1328 info->addr = port->addr; 1329 1330 snd_seq_set_port_info(port, info); 1331 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1332 snd_seq_port_unlock(port); 1333 1334 return 0; 1335 } 1336 1337 /* 1338 * DELETE PORT ioctl() 1339 */ 1340 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg) 1341 { 1342 struct snd_seq_port_info *info = arg; 1343 int err; 1344 1345 /* it is not allowed to remove the port for an another client */ 1346 if (info->addr.client != client->number) 1347 return -EPERM; 1348 1349 err = snd_seq_delete_port(client, info->addr.port); 1350 if (err >= 0) 1351 snd_seq_system_client_ev_port_exit(client->number, info->addr.port); 1352 return err; 1353 } 1354 1355 1356 /* 1357 * GET_PORT_INFO ioctl() (on any client) 1358 */ 1359 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg) 1360 { 1361 struct snd_seq_port_info *info = arg; 1362 struct snd_seq_client *cptr; 1363 struct snd_seq_client_port *port; 1364 1365 cptr = snd_seq_client_use_ptr(info->addr.client); 1366 if (cptr == NULL) 1367 return -ENXIO; 1368 1369 port = snd_seq_port_use_ptr(cptr, info->addr.port); 1370 if (port == NULL) { 1371 snd_seq_client_unlock(cptr); 1372 return -ENOENT; /* don't change */ 1373 } 1374 1375 /* get port info */ 1376 snd_seq_get_port_info(port, info); 1377 snd_seq_port_unlock(port); 1378 snd_seq_client_unlock(cptr); 1379 1380 return 0; 1381 } 1382 1383 1384 /* 1385 * SET_PORT_INFO ioctl() (only ports on this/own client) 1386 */ 1387 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg) 1388 { 1389 struct snd_seq_port_info *info = arg; 1390 struct snd_seq_client_port *port; 1391 1392 if (info->addr.client != client->number) /* only set our own ports ! */ 1393 return -EPERM; 1394 port = snd_seq_port_use_ptr(client, info->addr.port); 1395 if (port) { 1396 snd_seq_set_port_info(port, info); 1397 snd_seq_port_unlock(port); 1398 } 1399 return 0; 1400 } 1401 1402 1403 /* 1404 * port subscription (connection) 1405 */ 1406 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1407 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1408 1409 static int check_subscription_permission(struct snd_seq_client *client, 1410 struct snd_seq_client_port *sport, 1411 struct snd_seq_client_port *dport, 1412 struct snd_seq_port_subscribe *subs) 1413 { 1414 if (client->number != subs->sender.client && 1415 client->number != subs->dest.client) { 1416 /* connection by third client - check export permission */ 1417 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1418 return -EPERM; 1419 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1420 return -EPERM; 1421 } 1422 1423 /* check read permission */ 1424 /* if sender or receiver is the subscribing client itself, 1425 * no permission check is necessary 1426 */ 1427 if (client->number != subs->sender.client) { 1428 if (! check_port_perm(sport, PERM_RD)) 1429 return -EPERM; 1430 } 1431 /* check write permission */ 1432 if (client->number != subs->dest.client) { 1433 if (! check_port_perm(dport, PERM_WR)) 1434 return -EPERM; 1435 } 1436 return 0; 1437 } 1438 1439 /* 1440 * send an subscription notify event to user client: 1441 * client must be user client. 1442 */ 1443 int snd_seq_client_notify_subscription(int client, int port, 1444 struct snd_seq_port_subscribe *info, 1445 int evtype) 1446 { 1447 struct snd_seq_event event; 1448 1449 memset(&event, 0, sizeof(event)); 1450 event.type = evtype; 1451 event.data.connect.dest = info->dest; 1452 event.data.connect.sender = info->sender; 1453 1454 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1455 } 1456 1457 1458 /* 1459 * add to port's subscription list IOCTL interface 1460 */ 1461 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1462 void *arg) 1463 { 1464 struct snd_seq_port_subscribe *subs = arg; 1465 int result = -EINVAL; 1466 struct snd_seq_client *receiver = NULL, *sender = NULL; 1467 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1468 1469 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL) 1470 goto __end; 1471 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL) 1472 goto __end; 1473 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL) 1474 goto __end; 1475 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL) 1476 goto __end; 1477 1478 result = check_subscription_permission(client, sport, dport, subs); 1479 if (result < 0) 1480 goto __end; 1481 1482 /* connect them */ 1483 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs); 1484 if (! result) /* broadcast announce */ 1485 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1486 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1487 __end: 1488 if (sport) 1489 snd_seq_port_unlock(sport); 1490 if (dport) 1491 snd_seq_port_unlock(dport); 1492 if (sender) 1493 snd_seq_client_unlock(sender); 1494 if (receiver) 1495 snd_seq_client_unlock(receiver); 1496 return result; 1497 } 1498 1499 1500 /* 1501 * remove from port's subscription list 1502 */ 1503 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1504 void *arg) 1505 { 1506 struct snd_seq_port_subscribe *subs = arg; 1507 int result = -ENXIO; 1508 struct snd_seq_client *receiver = NULL, *sender = NULL; 1509 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1510 1511 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL) 1512 goto __end; 1513 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL) 1514 goto __end; 1515 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL) 1516 goto __end; 1517 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL) 1518 goto __end; 1519 1520 result = check_subscription_permission(client, sport, dport, subs); 1521 if (result < 0) 1522 goto __end; 1523 1524 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs); 1525 if (! result) /* broadcast announce */ 1526 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1527 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1528 __end: 1529 if (sport) 1530 snd_seq_port_unlock(sport); 1531 if (dport) 1532 snd_seq_port_unlock(dport); 1533 if (sender) 1534 snd_seq_client_unlock(sender); 1535 if (receiver) 1536 snd_seq_client_unlock(receiver); 1537 return result; 1538 } 1539 1540 1541 /* CREATE_QUEUE ioctl() */ 1542 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg) 1543 { 1544 struct snd_seq_queue_info *info = arg; 1545 struct snd_seq_queue *q; 1546 1547 q = snd_seq_queue_alloc(client->number, info->locked, info->flags); 1548 if (IS_ERR(q)) 1549 return PTR_ERR(q); 1550 1551 info->queue = q->queue; 1552 info->locked = q->locked; 1553 info->owner = q->owner; 1554 1555 /* set queue name */ 1556 if (!info->name[0]) 1557 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue); 1558 strscpy(q->name, info->name, sizeof(q->name)); 1559 snd_use_lock_free(&q->use_lock); 1560 1561 return 0; 1562 } 1563 1564 /* DELETE_QUEUE ioctl() */ 1565 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg) 1566 { 1567 struct snd_seq_queue_info *info = arg; 1568 1569 return snd_seq_queue_delete(client->number, info->queue); 1570 } 1571 1572 /* GET_QUEUE_INFO ioctl() */ 1573 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1574 void *arg) 1575 { 1576 struct snd_seq_queue_info *info = arg; 1577 struct snd_seq_queue *q; 1578 1579 q = queueptr(info->queue); 1580 if (q == NULL) 1581 return -EINVAL; 1582 1583 memset(info, 0, sizeof(*info)); 1584 info->queue = q->queue; 1585 info->owner = q->owner; 1586 info->locked = q->locked; 1587 strscpy(info->name, q->name, sizeof(info->name)); 1588 queuefree(q); 1589 1590 return 0; 1591 } 1592 1593 /* SET_QUEUE_INFO ioctl() */ 1594 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1595 void *arg) 1596 { 1597 struct snd_seq_queue_info *info = arg; 1598 struct snd_seq_queue *q; 1599 1600 if (info->owner != client->number) 1601 return -EINVAL; 1602 1603 /* change owner/locked permission */ 1604 if (snd_seq_queue_check_access(info->queue, client->number)) { 1605 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0) 1606 return -EPERM; 1607 if (info->locked) 1608 snd_seq_queue_use(info->queue, client->number, 1); 1609 } else { 1610 return -EPERM; 1611 } 1612 1613 q = queueptr(info->queue); 1614 if (! q) 1615 return -EINVAL; 1616 if (q->owner != client->number) { 1617 queuefree(q); 1618 return -EPERM; 1619 } 1620 strscpy(q->name, info->name, sizeof(q->name)); 1621 queuefree(q); 1622 1623 return 0; 1624 } 1625 1626 /* GET_NAMED_QUEUE ioctl() */ 1627 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, 1628 void *arg) 1629 { 1630 struct snd_seq_queue_info *info = arg; 1631 struct snd_seq_queue *q; 1632 1633 q = snd_seq_queue_find_name(info->name); 1634 if (q == NULL) 1635 return -EINVAL; 1636 info->queue = q->queue; 1637 info->owner = q->owner; 1638 info->locked = q->locked; 1639 queuefree(q); 1640 1641 return 0; 1642 } 1643 1644 /* GET_QUEUE_STATUS ioctl() */ 1645 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1646 void *arg) 1647 { 1648 struct snd_seq_queue_status *status = arg; 1649 struct snd_seq_queue *queue; 1650 struct snd_seq_timer *tmr; 1651 1652 queue = queueptr(status->queue); 1653 if (queue == NULL) 1654 return -EINVAL; 1655 memset(status, 0, sizeof(*status)); 1656 status->queue = queue->queue; 1657 1658 tmr = queue->timer; 1659 status->events = queue->tickq->cells + queue->timeq->cells; 1660 1661 status->time = snd_seq_timer_get_cur_time(tmr, true); 1662 status->tick = snd_seq_timer_get_cur_tick(tmr); 1663 1664 status->running = tmr->running; 1665 1666 status->flags = queue->flags; 1667 queuefree(queue); 1668 1669 return 0; 1670 } 1671 1672 1673 /* GET_QUEUE_TEMPO ioctl() */ 1674 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1675 void *arg) 1676 { 1677 struct snd_seq_queue_tempo *tempo = arg; 1678 struct snd_seq_queue *queue; 1679 struct snd_seq_timer *tmr; 1680 1681 queue = queueptr(tempo->queue); 1682 if (queue == NULL) 1683 return -EINVAL; 1684 memset(tempo, 0, sizeof(*tempo)); 1685 tempo->queue = queue->queue; 1686 1687 tmr = queue->timer; 1688 1689 tempo->tempo = tmr->tempo; 1690 tempo->ppq = tmr->ppq; 1691 tempo->skew_value = tmr->skew; 1692 tempo->skew_base = tmr->skew_base; 1693 queuefree(queue); 1694 1695 return 0; 1696 } 1697 1698 1699 /* SET_QUEUE_TEMPO ioctl() */ 1700 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1701 { 1702 if (!snd_seq_queue_check_access(tempo->queue, client)) 1703 return -EPERM; 1704 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1705 } 1706 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1707 1708 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1709 void *arg) 1710 { 1711 struct snd_seq_queue_tempo *tempo = arg; 1712 int result; 1713 1714 result = snd_seq_set_queue_tempo(client->number, tempo); 1715 return result < 0 ? result : 0; 1716 } 1717 1718 1719 /* GET_QUEUE_TIMER ioctl() */ 1720 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1721 void *arg) 1722 { 1723 struct snd_seq_queue_timer *timer = arg; 1724 struct snd_seq_queue *queue; 1725 struct snd_seq_timer *tmr; 1726 1727 queue = queueptr(timer->queue); 1728 if (queue == NULL) 1729 return -EINVAL; 1730 1731 mutex_lock(&queue->timer_mutex); 1732 tmr = queue->timer; 1733 memset(timer, 0, sizeof(*timer)); 1734 timer->queue = queue->queue; 1735 1736 timer->type = tmr->type; 1737 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1738 timer->u.alsa.id = tmr->alsa_id; 1739 timer->u.alsa.resolution = tmr->preferred_resolution; 1740 } 1741 mutex_unlock(&queue->timer_mutex); 1742 queuefree(queue); 1743 1744 return 0; 1745 } 1746 1747 1748 /* SET_QUEUE_TIMER ioctl() */ 1749 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1750 void *arg) 1751 { 1752 struct snd_seq_queue_timer *timer = arg; 1753 int result = 0; 1754 1755 if (timer->type != SNDRV_SEQ_TIMER_ALSA) 1756 return -EINVAL; 1757 1758 if (snd_seq_queue_check_access(timer->queue, client->number)) { 1759 struct snd_seq_queue *q; 1760 struct snd_seq_timer *tmr; 1761 1762 q = queueptr(timer->queue); 1763 if (q == NULL) 1764 return -ENXIO; 1765 mutex_lock(&q->timer_mutex); 1766 tmr = q->timer; 1767 snd_seq_queue_timer_close(timer->queue); 1768 tmr->type = timer->type; 1769 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1770 tmr->alsa_id = timer->u.alsa.id; 1771 tmr->preferred_resolution = timer->u.alsa.resolution; 1772 } 1773 result = snd_seq_queue_timer_open(timer->queue); 1774 mutex_unlock(&q->timer_mutex); 1775 queuefree(q); 1776 } else { 1777 return -EPERM; 1778 } 1779 1780 return result; 1781 } 1782 1783 1784 /* GET_QUEUE_CLIENT ioctl() */ 1785 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1786 void *arg) 1787 { 1788 struct snd_seq_queue_client *info = arg; 1789 int used; 1790 1791 used = snd_seq_queue_is_used(info->queue, client->number); 1792 if (used < 0) 1793 return -EINVAL; 1794 info->used = used; 1795 info->client = client->number; 1796 1797 return 0; 1798 } 1799 1800 1801 /* SET_QUEUE_CLIENT ioctl() */ 1802 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1803 void *arg) 1804 { 1805 struct snd_seq_queue_client *info = arg; 1806 int err; 1807 1808 if (info->used >= 0) { 1809 err = snd_seq_queue_use(info->queue, client->number, info->used); 1810 if (err < 0) 1811 return err; 1812 } 1813 1814 return snd_seq_ioctl_get_queue_client(client, arg); 1815 } 1816 1817 1818 /* GET_CLIENT_POOL ioctl() */ 1819 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1820 void *arg) 1821 { 1822 struct snd_seq_client_pool *info = arg; 1823 struct snd_seq_client *cptr; 1824 1825 cptr = snd_seq_client_use_ptr(info->client); 1826 if (cptr == NULL) 1827 return -ENOENT; 1828 memset(info, 0, sizeof(*info)); 1829 info->client = cptr->number; 1830 info->output_pool = cptr->pool->size; 1831 info->output_room = cptr->pool->room; 1832 info->output_free = info->output_pool; 1833 info->output_free = snd_seq_unused_cells(cptr->pool); 1834 if (cptr->type == USER_CLIENT) { 1835 info->input_pool = cptr->data.user.fifo_pool_size; 1836 info->input_free = info->input_pool; 1837 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo); 1838 } else { 1839 info->input_pool = 0; 1840 info->input_free = 0; 1841 } 1842 snd_seq_client_unlock(cptr); 1843 1844 return 0; 1845 } 1846 1847 /* SET_CLIENT_POOL ioctl() */ 1848 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1849 void *arg) 1850 { 1851 struct snd_seq_client_pool *info = arg; 1852 int rc; 1853 1854 if (client->number != info->client) 1855 return -EINVAL; /* can't change other clients */ 1856 1857 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS && 1858 (! snd_seq_write_pool_allocated(client) || 1859 info->output_pool != client->pool->size)) { 1860 if (snd_seq_write_pool_allocated(client)) { 1861 /* is the pool in use? */ 1862 if (atomic_read(&client->pool->counter)) 1863 return -EBUSY; 1864 /* remove all existing cells */ 1865 snd_seq_pool_mark_closing(client->pool); 1866 snd_seq_pool_done(client->pool); 1867 } 1868 client->pool->size = info->output_pool; 1869 rc = snd_seq_pool_init(client->pool); 1870 if (rc < 0) 1871 return rc; 1872 } 1873 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1874 info->input_pool >= 1 && 1875 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1876 info->input_pool != client->data.user.fifo_pool_size) { 1877 /* change pool size */ 1878 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool); 1879 if (rc < 0) 1880 return rc; 1881 client->data.user.fifo_pool_size = info->input_pool; 1882 } 1883 if (info->output_room >= 1 && 1884 info->output_room <= client->pool->size) { 1885 client->pool->room = info->output_room; 1886 } 1887 1888 return snd_seq_ioctl_get_client_pool(client, arg); 1889 } 1890 1891 1892 /* REMOVE_EVENTS ioctl() */ 1893 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1894 void *arg) 1895 { 1896 struct snd_seq_remove_events *info = arg; 1897 1898 /* 1899 * Input mostly not implemented XXX. 1900 */ 1901 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1902 /* 1903 * No restrictions so for a user client we can clear 1904 * the whole fifo 1905 */ 1906 if (client->type == USER_CLIENT && client->data.user.fifo) 1907 snd_seq_fifo_clear(client->data.user.fifo); 1908 } 1909 1910 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1911 snd_seq_queue_remove_cells(client->number, info); 1912 1913 return 0; 1914 } 1915 1916 1917 /* 1918 * get subscription info 1919 */ 1920 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1921 void *arg) 1922 { 1923 struct snd_seq_port_subscribe *subs = arg; 1924 int result; 1925 struct snd_seq_client *sender = NULL; 1926 struct snd_seq_client_port *sport = NULL; 1927 1928 result = -EINVAL; 1929 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL) 1930 goto __end; 1931 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL) 1932 goto __end; 1933 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest, 1934 subs); 1935 __end: 1936 if (sport) 1937 snd_seq_port_unlock(sport); 1938 if (sender) 1939 snd_seq_client_unlock(sender); 1940 1941 return result; 1942 } 1943 1944 1945 /* 1946 * get subscription info - check only its presence 1947 */ 1948 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg) 1949 { 1950 struct snd_seq_query_subs *subs = arg; 1951 int result = -ENXIO; 1952 struct snd_seq_client *cptr = NULL; 1953 struct snd_seq_client_port *port = NULL; 1954 struct snd_seq_port_subs_info *group; 1955 struct list_head *p; 1956 int i; 1957 1958 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL) 1959 goto __end; 1960 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL) 1961 goto __end; 1962 1963 switch (subs->type) { 1964 case SNDRV_SEQ_QUERY_SUBS_READ: 1965 group = &port->c_src; 1966 break; 1967 case SNDRV_SEQ_QUERY_SUBS_WRITE: 1968 group = &port->c_dest; 1969 break; 1970 default: 1971 goto __end; 1972 } 1973 1974 down_read(&group->list_mutex); 1975 /* search for the subscriber */ 1976 subs->num_subs = group->count; 1977 i = 0; 1978 result = -ENOENT; 1979 list_for_each(p, &group->list_head) { 1980 if (i++ == subs->index) { 1981 /* found! */ 1982 struct snd_seq_subscribers *s; 1983 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) { 1984 s = list_entry(p, struct snd_seq_subscribers, src_list); 1985 subs->addr = s->info.dest; 1986 } else { 1987 s = list_entry(p, struct snd_seq_subscribers, dest_list); 1988 subs->addr = s->info.sender; 1989 } 1990 subs->flags = s->info.flags; 1991 subs->queue = s->info.queue; 1992 result = 0; 1993 break; 1994 } 1995 } 1996 up_read(&group->list_mutex); 1997 1998 __end: 1999 if (port) 2000 snd_seq_port_unlock(port); 2001 if (cptr) 2002 snd_seq_client_unlock(cptr); 2003 2004 return result; 2005 } 2006 2007 2008 /* 2009 * query next client 2010 */ 2011 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2012 void *arg) 2013 { 2014 struct snd_seq_client_info *info = arg; 2015 struct snd_seq_client *cptr = NULL; 2016 2017 /* search for next client */ 2018 if (info->client < INT_MAX) 2019 info->client++; 2020 if (info->client < 0) 2021 info->client = 0; 2022 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) { 2023 cptr = snd_seq_client_use_ptr(info->client); 2024 if (cptr) 2025 break; /* found */ 2026 } 2027 if (cptr == NULL) 2028 return -ENOENT; 2029 2030 get_client_info(cptr, info); 2031 snd_seq_client_unlock(cptr); 2032 2033 return 0; 2034 } 2035 2036 /* 2037 * query next port 2038 */ 2039 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2040 void *arg) 2041 { 2042 struct snd_seq_port_info *info = arg; 2043 struct snd_seq_client *cptr; 2044 struct snd_seq_client_port *port = NULL; 2045 2046 cptr = snd_seq_client_use_ptr(info->addr.client); 2047 if (cptr == NULL) 2048 return -ENXIO; 2049 2050 /* search for next port */ 2051 info->addr.port++; 2052 port = snd_seq_port_query_nearest(cptr, info); 2053 if (port == NULL) { 2054 snd_seq_client_unlock(cptr); 2055 return -ENOENT; 2056 } 2057 2058 /* get port info */ 2059 info->addr = port->addr; 2060 snd_seq_get_port_info(port, info); 2061 snd_seq_port_unlock(port); 2062 snd_seq_client_unlock(cptr); 2063 2064 return 0; 2065 } 2066 2067 /* -------------------------------------------------------- */ 2068 2069 static const struct ioctl_handler { 2070 unsigned int cmd; 2071 int (*func)(struct snd_seq_client *client, void *arg); 2072 } ioctl_handlers[] = { 2073 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion }, 2074 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id }, 2075 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2076 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2077 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2078 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2079 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2080 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2081 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2082 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2083 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2084 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2085 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2086 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2087 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2088 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2089 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2090 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2091 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2092 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2093 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2094 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2095 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2096 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2097 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2098 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2099 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2100 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2101 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2102 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2103 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2104 { 0, NULL }, 2105 }; 2106 2107 static long snd_seq_ioctl(struct file *file, unsigned int cmd, 2108 unsigned long arg) 2109 { 2110 struct snd_seq_client *client = file->private_data; 2111 /* To use kernel stack for ioctl data. */ 2112 union { 2113 int pversion; 2114 int client_id; 2115 struct snd_seq_system_info system_info; 2116 struct snd_seq_running_info running_info; 2117 struct snd_seq_client_info client_info; 2118 struct snd_seq_port_info port_info; 2119 struct snd_seq_port_subscribe port_subscribe; 2120 struct snd_seq_queue_info queue_info; 2121 struct snd_seq_queue_status queue_status; 2122 struct snd_seq_queue_tempo tempo; 2123 struct snd_seq_queue_timer queue_timer; 2124 struct snd_seq_queue_client queue_client; 2125 struct snd_seq_client_pool client_pool; 2126 struct snd_seq_remove_events remove_events; 2127 struct snd_seq_query_subs query_subs; 2128 } buf; 2129 const struct ioctl_handler *handler; 2130 unsigned long size; 2131 int err; 2132 2133 if (snd_BUG_ON(!client)) 2134 return -ENXIO; 2135 2136 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2137 if (handler->cmd == cmd) 2138 break; 2139 } 2140 if (handler->cmd == 0) 2141 return -ENOTTY; 2142 2143 memset(&buf, 0, sizeof(buf)); 2144 2145 /* 2146 * All of ioctl commands for ALSA sequencer get an argument of size 2147 * within 13 bits. We can safely pick up the size from the command. 2148 */ 2149 size = _IOC_SIZE(handler->cmd); 2150 if (handler->cmd & IOC_IN) { 2151 if (copy_from_user(&buf, (const void __user *)arg, size)) 2152 return -EFAULT; 2153 } 2154 2155 mutex_lock(&client->ioctl_mutex); 2156 err = handler->func(client, &buf); 2157 mutex_unlock(&client->ioctl_mutex); 2158 if (err >= 0) { 2159 /* Some commands includes a bug in 'dir' field. */ 2160 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT || 2161 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL || 2162 (handler->cmd & IOC_OUT)) 2163 if (copy_to_user((void __user *)arg, &buf, size)) 2164 return -EFAULT; 2165 } 2166 2167 return err; 2168 } 2169 2170 #ifdef CONFIG_COMPAT 2171 #include "seq_compat.c" 2172 #else 2173 #define snd_seq_ioctl_compat NULL 2174 #endif 2175 2176 /* -------------------------------------------------------- */ 2177 2178 2179 /* exported to kernel modules */ 2180 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2181 const char *name_fmt, ...) 2182 { 2183 struct snd_seq_client *client; 2184 va_list args; 2185 2186 if (snd_BUG_ON(in_interrupt())) 2187 return -EBUSY; 2188 2189 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2190 return -EINVAL; 2191 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2192 return -EINVAL; 2193 2194 mutex_lock(®ister_mutex); 2195 2196 if (card) { 2197 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2198 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2199 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2200 client_index = -1; 2201 } 2202 2203 /* empty write queue as default */ 2204 client = seq_create_client1(client_index, 0); 2205 if (client == NULL) { 2206 mutex_unlock(®ister_mutex); 2207 return -EBUSY; /* failure code */ 2208 } 2209 usage_alloc(&client_usage, 1); 2210 2211 client->accept_input = 1; 2212 client->accept_output = 1; 2213 client->data.kernel.card = card; 2214 2215 va_start(args, name_fmt); 2216 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2217 va_end(args); 2218 2219 client->type = KERNEL_CLIENT; 2220 mutex_unlock(®ister_mutex); 2221 2222 /* make others aware this new client */ 2223 snd_seq_system_client_ev_client_start(client->number); 2224 2225 /* return client number to caller */ 2226 return client->number; 2227 } 2228 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2229 2230 /* exported to kernel modules */ 2231 int snd_seq_delete_kernel_client(int client) 2232 { 2233 struct snd_seq_client *ptr; 2234 2235 if (snd_BUG_ON(in_interrupt())) 2236 return -EBUSY; 2237 2238 ptr = clientptr(client); 2239 if (ptr == NULL) 2240 return -EINVAL; 2241 2242 seq_free_client(ptr); 2243 kfree(ptr); 2244 return 0; 2245 } 2246 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2247 2248 /* 2249 * exported, called by kernel clients to enqueue events (w/o blocking) 2250 * 2251 * RETURN VALUE: zero if succeed, negative if error 2252 */ 2253 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, 2254 struct file *file, bool blocking) 2255 { 2256 struct snd_seq_client *cptr; 2257 int result; 2258 2259 if (snd_BUG_ON(!ev)) 2260 return -EINVAL; 2261 2262 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2263 return 0; /* ignore this */ 2264 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2265 return -EINVAL; /* quoted events can't be enqueued */ 2266 2267 /* fill in client number */ 2268 ev->source.client = client; 2269 2270 if (check_event_type_and_length(ev)) 2271 return -EINVAL; 2272 2273 cptr = snd_seq_client_use_ptr(client); 2274 if (cptr == NULL) 2275 return -EINVAL; 2276 2277 if (!cptr->accept_output) { 2278 result = -EPERM; 2279 } else { /* send it */ 2280 mutex_lock(&cptr->ioctl_mutex); 2281 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, 2282 false, 0, 2283 &cptr->ioctl_mutex); 2284 mutex_unlock(&cptr->ioctl_mutex); 2285 } 2286 2287 snd_seq_client_unlock(cptr); 2288 return result; 2289 } 2290 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2291 2292 /* 2293 * exported, called by kernel clients to dispatch events directly to other 2294 * clients, bypassing the queues. Event time-stamp will be updated. 2295 * 2296 * RETURN VALUE: negative = delivery failed, 2297 * zero, or positive: the number of delivered events 2298 */ 2299 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2300 int atomic, int hop) 2301 { 2302 struct snd_seq_client *cptr; 2303 int result; 2304 2305 if (snd_BUG_ON(!ev)) 2306 return -EINVAL; 2307 2308 /* fill in client number */ 2309 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2310 ev->source.client = client; 2311 2312 if (check_event_type_and_length(ev)) 2313 return -EINVAL; 2314 2315 cptr = snd_seq_client_use_ptr(client); 2316 if (cptr == NULL) 2317 return -EINVAL; 2318 2319 if (!cptr->accept_output) 2320 result = -EPERM; 2321 else 2322 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2323 2324 snd_seq_client_unlock(cptr); 2325 return result; 2326 } 2327 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2328 2329 /** 2330 * snd_seq_kernel_client_ctl - operate a command for a client with data in 2331 * kernel space. 2332 * @clientid: A numerical ID for a client. 2333 * @cmd: An ioctl(2) command for ALSA sequencer operation. 2334 * @arg: A pointer to data in kernel space. 2335 * 2336 * Against its name, both kernel/application client can be handled by this 2337 * kernel API. A pointer of 'arg' argument should be in kernel space. 2338 * 2339 * Return: 0 at success. Negative error code at failure. 2340 */ 2341 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2342 { 2343 const struct ioctl_handler *handler; 2344 struct snd_seq_client *client; 2345 2346 client = clientptr(clientid); 2347 if (client == NULL) 2348 return -ENXIO; 2349 2350 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2351 if (handler->cmd == cmd) 2352 return handler->func(client, arg); 2353 } 2354 2355 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2356 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2357 return -ENOTTY; 2358 } 2359 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2360 2361 /* exported (for OSS emulator) */ 2362 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2363 { 2364 struct snd_seq_client *client; 2365 2366 client = clientptr(clientid); 2367 if (client == NULL) 2368 return -ENXIO; 2369 2370 if (! snd_seq_write_pool_allocated(client)) 2371 return 1; 2372 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2373 return 1; 2374 return 0; 2375 } 2376 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2377 2378 /*---------------------------------------------------------------------------*/ 2379 2380 #ifdef CONFIG_SND_PROC_FS 2381 /* 2382 * /proc interface 2383 */ 2384 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2385 struct snd_seq_port_subs_info *group, 2386 int is_src, char *msg) 2387 { 2388 struct list_head *p; 2389 struct snd_seq_subscribers *s; 2390 int count = 0; 2391 2392 down_read(&group->list_mutex); 2393 if (list_empty(&group->list_head)) { 2394 up_read(&group->list_mutex); 2395 return; 2396 } 2397 snd_iprintf(buffer, msg); 2398 list_for_each(p, &group->list_head) { 2399 if (is_src) 2400 s = list_entry(p, struct snd_seq_subscribers, src_list); 2401 else 2402 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2403 if (count++) 2404 snd_iprintf(buffer, ", "); 2405 snd_iprintf(buffer, "%d:%d", 2406 is_src ? s->info.dest.client : s->info.sender.client, 2407 is_src ? s->info.dest.port : s->info.sender.port); 2408 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2409 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2410 if (group->exclusive) 2411 snd_iprintf(buffer, "[ex]"); 2412 } 2413 up_read(&group->list_mutex); 2414 snd_iprintf(buffer, "\n"); 2415 } 2416 2417 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2418 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2419 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2420 2421 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2422 2423 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2424 struct snd_seq_client *client) 2425 { 2426 struct snd_seq_client_port *p; 2427 2428 mutex_lock(&client->ports_mutex); 2429 list_for_each_entry(p, &client->ports_list_head, list) { 2430 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2431 p->addr.port, p->name, 2432 FLAG_PERM_RD(p->capability), 2433 FLAG_PERM_WR(p->capability), 2434 FLAG_PERM_EX(p->capability), 2435 FLAG_PERM_DUPLEX(p->capability)); 2436 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2437 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2438 } 2439 mutex_unlock(&client->ports_mutex); 2440 } 2441 2442 2443 /* exported to seq_info.c */ 2444 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2445 struct snd_info_buffer *buffer) 2446 { 2447 int c; 2448 struct snd_seq_client *client; 2449 2450 snd_iprintf(buffer, "Client info\n"); 2451 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2452 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2453 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2454 snd_iprintf(buffer, "\n"); 2455 2456 /* list the client table */ 2457 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2458 client = snd_seq_client_use_ptr(c); 2459 if (client == NULL) 2460 continue; 2461 if (client->type == NO_CLIENT) { 2462 snd_seq_client_unlock(client); 2463 continue; 2464 } 2465 2466 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2467 c, client->name, 2468 client->type == USER_CLIENT ? "User" : "Kernel"); 2469 snd_seq_info_dump_ports(buffer, client); 2470 if (snd_seq_write_pool_allocated(client)) { 2471 snd_iprintf(buffer, " Output pool :\n"); 2472 snd_seq_info_pool(buffer, client->pool, " "); 2473 } 2474 if (client->type == USER_CLIENT && client->data.user.fifo && 2475 client->data.user.fifo->pool) { 2476 snd_iprintf(buffer, " Input pool :\n"); 2477 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2478 } 2479 snd_seq_client_unlock(client); 2480 } 2481 } 2482 #endif /* CONFIG_SND_PROC_FS */ 2483 2484 /*---------------------------------------------------------------------------*/ 2485 2486 2487 /* 2488 * REGISTRATION PART 2489 */ 2490 2491 static const struct file_operations snd_seq_f_ops = 2492 { 2493 .owner = THIS_MODULE, 2494 .read = snd_seq_read, 2495 .write = snd_seq_write, 2496 .open = snd_seq_open, 2497 .release = snd_seq_release, 2498 .llseek = no_llseek, 2499 .poll = snd_seq_poll, 2500 .unlocked_ioctl = snd_seq_ioctl, 2501 .compat_ioctl = snd_seq_ioctl_compat, 2502 }; 2503 2504 static struct device seq_dev; 2505 2506 /* 2507 * register sequencer device 2508 */ 2509 int __init snd_sequencer_device_init(void) 2510 { 2511 int err; 2512 2513 snd_device_initialize(&seq_dev, NULL); 2514 dev_set_name(&seq_dev, "seq"); 2515 2516 mutex_lock(®ister_mutex); 2517 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2518 &snd_seq_f_ops, NULL, &seq_dev); 2519 mutex_unlock(®ister_mutex); 2520 if (err < 0) { 2521 put_device(&seq_dev); 2522 return err; 2523 } 2524 2525 return 0; 2526 } 2527 2528 2529 2530 /* 2531 * unregister sequencer device 2532 */ 2533 void snd_sequencer_device_done(void) 2534 { 2535 snd_unregister_device(&seq_dev); 2536 put_device(&seq_dev); 2537 } 2538