1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ALSA sequencer Client Manager 4 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl> 5 * Jaroslav Kysela <perex@perex.cz> 6 * Takashi Iwai <tiwai@suse.de> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/export.h> 11 #include <linux/slab.h> 12 #include <sound/core.h> 13 #include <sound/minors.h> 14 #include <linux/kmod.h> 15 16 #include <sound/seq_kernel.h> 17 #include <sound/ump.h> 18 #include "seq_clientmgr.h" 19 #include "seq_memory.h" 20 #include "seq_queue.h" 21 #include "seq_timer.h" 22 #include "seq_info.h" 23 #include "seq_system.h" 24 #include "seq_ump_convert.h" 25 #include <sound/seq_device.h> 26 #ifdef CONFIG_COMPAT 27 #include <linux/compat.h> 28 #endif 29 30 /* Client Manager 31 32 * this module handles the connections of userland and kernel clients 33 * 34 */ 35 36 /* 37 * There are four ranges of client numbers (last two shared): 38 * 0..15: global clients 39 * 16..127: statically allocated client numbers for cards 0..27 40 * 128..191: dynamically allocated client numbers for cards 28..31 41 * 128..191: dynamically allocated client numbers for applications 42 */ 43 44 /* number of kernel non-card clients */ 45 #define SNDRV_SEQ_GLOBAL_CLIENTS 16 46 /* clients per cards, for static clients */ 47 #define SNDRV_SEQ_CLIENTS_PER_CARD 4 48 /* dynamically allocated client numbers (both kernel drivers and user space) */ 49 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128 50 51 #define SNDRV_SEQ_LFLG_INPUT 0x0001 52 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002 53 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT) 54 55 static DEFINE_SPINLOCK(clients_lock); 56 static DEFINE_MUTEX(register_mutex); 57 58 /* 59 * client table 60 */ 61 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; 62 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS]; 63 static struct snd_seq_usage client_usage; 64 65 /* 66 * prototypes 67 */ 68 static int bounce_error_event(struct snd_seq_client *client, 69 struct snd_seq_event *event, 70 int err, int atomic, int hop); 71 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 72 struct snd_seq_event *event, 73 int atomic, int hop); 74 75 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 76 static void free_ump_info(struct snd_seq_client *client); 77 #endif 78 79 /* 80 */ 81 static inline unsigned short snd_seq_file_flags(struct file *file) 82 { 83 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 84 case FMODE_WRITE: 85 return SNDRV_SEQ_LFLG_OUTPUT; 86 case FMODE_READ: 87 return SNDRV_SEQ_LFLG_INPUT; 88 default: 89 return SNDRV_SEQ_LFLG_OPEN; 90 } 91 } 92 93 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client) 94 { 95 return snd_seq_total_cells(client->pool) > 0; 96 } 97 98 /* return pointer to client structure for specified id */ 99 static struct snd_seq_client *clientptr(int clientid) 100 { 101 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 102 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 103 clientid); 104 return NULL; 105 } 106 return clienttab[clientid]; 107 } 108 109 struct snd_seq_client *snd_seq_client_use_ptr(int clientid) 110 { 111 unsigned long flags; 112 struct snd_seq_client *client; 113 114 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 115 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 116 clientid); 117 return NULL; 118 } 119 spin_lock_irqsave(&clients_lock, flags); 120 client = clientptr(clientid); 121 if (client) 122 goto __lock; 123 if (clienttablock[clientid]) { 124 spin_unlock_irqrestore(&clients_lock, flags); 125 return NULL; 126 } 127 spin_unlock_irqrestore(&clients_lock, flags); 128 #ifdef CONFIG_MODULES 129 if (!in_interrupt()) { 130 static DECLARE_BITMAP(client_requested, SNDRV_SEQ_GLOBAL_CLIENTS); 131 static DECLARE_BITMAP(card_requested, SNDRV_CARDS); 132 133 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { 134 int idx; 135 136 if (!test_and_set_bit(clientid, client_requested)) { 137 for (idx = 0; idx < 15; idx++) { 138 if (seq_client_load[idx] < 0) 139 break; 140 if (seq_client_load[idx] == clientid) { 141 request_module("snd-seq-client-%i", 142 clientid); 143 break; 144 } 145 } 146 } 147 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { 148 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / 149 SNDRV_SEQ_CLIENTS_PER_CARD; 150 if (card < snd_ecards_limit) { 151 if (!test_and_set_bit(card, card_requested)) 152 snd_request_card(card); 153 snd_seq_device_load_drivers(); 154 } 155 } 156 spin_lock_irqsave(&clients_lock, flags); 157 client = clientptr(clientid); 158 if (client) 159 goto __lock; 160 spin_unlock_irqrestore(&clients_lock, flags); 161 } 162 #endif 163 return NULL; 164 165 __lock: 166 snd_use_lock_use(&client->use_lock); 167 spin_unlock_irqrestore(&clients_lock, flags); 168 return client; 169 } 170 171 /* Take refcount and perform ioctl_mutex lock on the given client; 172 * used only for OSS sequencer 173 * Unlock via snd_seq_client_ioctl_unlock() below 174 */ 175 bool snd_seq_client_ioctl_lock(int clientid) 176 { 177 struct snd_seq_client *client; 178 179 client = snd_seq_client_use_ptr(clientid); 180 if (!client) 181 return false; 182 mutex_lock(&client->ioctl_mutex); 183 /* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */ 184 return true; 185 } 186 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock); 187 188 /* Unlock and unref the given client; for OSS sequencer use only */ 189 void snd_seq_client_ioctl_unlock(int clientid) 190 { 191 struct snd_seq_client *client; 192 193 client = snd_seq_client_use_ptr(clientid); 194 if (WARN_ON(!client)) 195 return; 196 mutex_unlock(&client->ioctl_mutex); 197 /* The doubly unrefs below are intentional; the first one releases the 198 * leftover from snd_seq_client_ioctl_lock() above, and the second one 199 * is for releasing snd_seq_client_use_ptr() in this function 200 */ 201 snd_seq_client_unlock(client); 202 snd_seq_client_unlock(client); 203 } 204 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock); 205 206 static void usage_alloc(struct snd_seq_usage *res, int num) 207 { 208 res->cur += num; 209 if (res->cur > res->peak) 210 res->peak = res->cur; 211 } 212 213 static void usage_free(struct snd_seq_usage *res, int num) 214 { 215 res->cur -= num; 216 } 217 218 /* initialise data structures */ 219 int __init client_init_data(void) 220 { 221 /* zap out the client table */ 222 memset(&clienttablock, 0, sizeof(clienttablock)); 223 memset(&clienttab, 0, sizeof(clienttab)); 224 return 0; 225 } 226 227 228 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) 229 { 230 int c; 231 struct snd_seq_client *client; 232 233 /* init client data */ 234 client = kzalloc(sizeof(*client), GFP_KERNEL); 235 if (client == NULL) 236 return NULL; 237 client->pool = snd_seq_pool_new(poolsize); 238 if (client->pool == NULL) { 239 kfree(client); 240 return NULL; 241 } 242 client->type = NO_CLIENT; 243 snd_use_lock_init(&client->use_lock); 244 rwlock_init(&client->ports_lock); 245 mutex_init(&client->ports_mutex); 246 INIT_LIST_HEAD(&client->ports_list_head); 247 mutex_init(&client->ioctl_mutex); 248 client->ump_endpoint_port = -1; 249 250 /* find free slot in the client table */ 251 spin_lock_irq(&clients_lock); 252 if (client_index < 0) { 253 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; 254 c < SNDRV_SEQ_MAX_CLIENTS; 255 c++) { 256 if (clienttab[c] || clienttablock[c]) 257 continue; 258 clienttab[client->number = c] = client; 259 spin_unlock_irq(&clients_lock); 260 return client; 261 } 262 } else { 263 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 264 clienttab[client->number = client_index] = client; 265 spin_unlock_irq(&clients_lock); 266 return client; 267 } 268 } 269 spin_unlock_irq(&clients_lock); 270 snd_seq_pool_delete(&client->pool); 271 kfree(client); 272 return NULL; /* no free slot found or busy, return failure code */ 273 } 274 275 276 static int seq_free_client1(struct snd_seq_client *client) 277 { 278 if (!client) 279 return 0; 280 spin_lock_irq(&clients_lock); 281 clienttablock[client->number] = 1; 282 clienttab[client->number] = NULL; 283 spin_unlock_irq(&clients_lock); 284 snd_seq_delete_all_ports(client); 285 snd_seq_queue_client_leave(client->number); 286 snd_use_lock_sync(&client->use_lock); 287 if (client->pool) 288 snd_seq_pool_delete(&client->pool); 289 spin_lock_irq(&clients_lock); 290 clienttablock[client->number] = 0; 291 spin_unlock_irq(&clients_lock); 292 return 0; 293 } 294 295 296 static void seq_free_client(struct snd_seq_client * client) 297 { 298 mutex_lock(®ister_mutex); 299 switch (client->type) { 300 case NO_CLIENT: 301 pr_warn("ALSA: seq: Trying to free unused client %d\n", 302 client->number); 303 break; 304 case USER_CLIENT: 305 case KERNEL_CLIENT: 306 seq_free_client1(client); 307 usage_free(&client_usage, 1); 308 break; 309 310 default: 311 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n", 312 client->number, client->type); 313 } 314 mutex_unlock(®ister_mutex); 315 316 snd_seq_system_client_ev_client_exit(client->number); 317 } 318 319 320 321 /* -------------------------------------------------------- */ 322 323 /* create a user client */ 324 static int snd_seq_open(struct inode *inode, struct file *file) 325 { 326 int c, mode; /* client id */ 327 struct snd_seq_client *client; 328 struct snd_seq_user_client *user; 329 int err; 330 331 err = stream_open(inode, file); 332 if (err < 0) 333 return err; 334 335 mutex_lock(®ister_mutex); 336 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 337 if (!client) { 338 mutex_unlock(®ister_mutex); 339 return -ENOMEM; /* failure code */ 340 } 341 342 mode = snd_seq_file_flags(file); 343 if (mode & SNDRV_SEQ_LFLG_INPUT) 344 client->accept_input = 1; 345 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 346 client->accept_output = 1; 347 348 user = &client->data.user; 349 user->fifo = NULL; 350 user->fifo_pool_size = 0; 351 352 if (mode & SNDRV_SEQ_LFLG_INPUT) { 353 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 354 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 355 if (user->fifo == NULL) { 356 seq_free_client1(client); 357 kfree(client); 358 mutex_unlock(®ister_mutex); 359 return -ENOMEM; 360 } 361 } 362 363 usage_alloc(&client_usage, 1); 364 client->type = USER_CLIENT; 365 mutex_unlock(®ister_mutex); 366 367 c = client->number; 368 file->private_data = client; 369 370 /* fill client data */ 371 user->file = file; 372 sprintf(client->name, "Client-%d", c); 373 client->data.user.owner = get_pid(task_pid(current)); 374 375 /* make others aware this new client */ 376 snd_seq_system_client_ev_client_start(c); 377 378 return 0; 379 } 380 381 /* delete a user client */ 382 static int snd_seq_release(struct inode *inode, struct file *file) 383 { 384 struct snd_seq_client *client = file->private_data; 385 386 if (client) { 387 seq_free_client(client); 388 if (client->data.user.fifo) 389 snd_seq_fifo_delete(&client->data.user.fifo); 390 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 391 free_ump_info(client); 392 #endif 393 put_pid(client->data.user.owner); 394 kfree(client); 395 } 396 397 return 0; 398 } 399 400 static bool event_is_compatible(const struct snd_seq_client *client, 401 const struct snd_seq_event *ev) 402 { 403 if (snd_seq_ev_is_ump(ev) && !client->midi_version) 404 return false; 405 if (snd_seq_ev_is_ump(ev) && snd_seq_ev_is_variable(ev)) 406 return false; 407 return true; 408 } 409 410 /* handle client read() */ 411 /* possible error values: 412 * -ENXIO invalid client or file open mode 413 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 414 * -EINVAL no enough user-space buffer to write the whole event 415 * -EFAULT seg. fault during copy to user space 416 */ 417 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, 418 loff_t *offset) 419 { 420 struct snd_seq_client *client = file->private_data; 421 struct snd_seq_fifo *fifo; 422 size_t aligned_size; 423 int err; 424 long result = 0; 425 struct snd_seq_event_cell *cell; 426 427 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 428 return -ENXIO; 429 430 if (!access_ok(buf, count)) 431 return -EFAULT; 432 433 /* check client structures are in place */ 434 if (snd_BUG_ON(!client)) 435 return -ENXIO; 436 437 if (!client->accept_input) 438 return -ENXIO; 439 fifo = client->data.user.fifo; 440 if (!fifo) 441 return -ENXIO; 442 443 if (atomic_read(&fifo->overflow) > 0) { 444 /* buffer overflow is detected */ 445 snd_seq_fifo_clear(fifo); 446 /* return error code */ 447 return -ENOSPC; 448 } 449 450 cell = NULL; 451 err = 0; 452 snd_seq_fifo_lock(fifo); 453 454 if (IS_ENABLED(CONFIG_SND_SEQ_UMP) && client->midi_version > 0) 455 aligned_size = sizeof(struct snd_seq_ump_event); 456 else 457 aligned_size = sizeof(struct snd_seq_event); 458 459 /* while data available in queue */ 460 while (count >= aligned_size) { 461 int nonblock; 462 463 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 464 err = snd_seq_fifo_cell_out(fifo, &cell, nonblock); 465 if (err < 0) 466 break; 467 if (!event_is_compatible(client, &cell->event)) { 468 snd_seq_cell_free(cell); 469 cell = NULL; 470 continue; 471 } 472 if (snd_seq_ev_is_variable(&cell->event)) { 473 struct snd_seq_ump_event tmpev; 474 475 memcpy(&tmpev, &cell->event, aligned_size); 476 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 477 if (copy_to_user(buf, &tmpev, aligned_size)) { 478 err = -EFAULT; 479 break; 480 } 481 count -= aligned_size; 482 buf += aligned_size; 483 err = snd_seq_expand_var_event(&cell->event, count, 484 (char __force *)buf, 0, 485 aligned_size); 486 if (err < 0) 487 break; 488 result += err; 489 count -= err; 490 buf += err; 491 } else { 492 if (copy_to_user(buf, &cell->event, aligned_size)) { 493 err = -EFAULT; 494 break; 495 } 496 count -= aligned_size; 497 buf += aligned_size; 498 } 499 snd_seq_cell_free(cell); 500 cell = NULL; /* to be sure */ 501 result += aligned_size; 502 } 503 504 if (err < 0) { 505 if (cell) 506 snd_seq_fifo_cell_putback(fifo, cell); 507 if (err == -EAGAIN && result > 0) 508 err = 0; 509 } 510 snd_seq_fifo_unlock(fifo); 511 512 return (err < 0) ? err : result; 513 } 514 515 516 /* 517 * check access permission to the port 518 */ 519 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 520 { 521 if ((port->capability & flags) != flags) 522 return 0; 523 return flags; 524 } 525 526 /* 527 * check if the destination client is available, and return the pointer 528 */ 529 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event) 530 { 531 struct snd_seq_client *dest; 532 533 dest = snd_seq_client_use_ptr(event->dest.client); 534 if (dest == NULL) 535 return NULL; 536 if (! dest->accept_input) 537 goto __not_avail; 538 if (snd_seq_ev_is_ump(event)) 539 return dest; /* ok - no filter checks */ 540 541 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 542 ! test_bit(event->type, dest->event_filter)) 543 goto __not_avail; 544 545 return dest; /* ok - accessible */ 546 __not_avail: 547 snd_seq_client_unlock(dest); 548 return NULL; 549 } 550 551 552 /* 553 * Return the error event. 554 * 555 * If the receiver client is a user client, the original event is 556 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 557 * the original event is also variable length, the external data is 558 * copied after the event record. 559 * If the receiver client is a kernel client, the original event is 560 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 561 * kmalloc. 562 */ 563 static int bounce_error_event(struct snd_seq_client *client, 564 struct snd_seq_event *event, 565 int err, int atomic, int hop) 566 { 567 struct snd_seq_event bounce_ev; 568 int result; 569 570 if (client == NULL || 571 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 572 ! client->accept_input) 573 return 0; /* ignored */ 574 575 /* set up quoted error */ 576 memset(&bounce_ev, 0, sizeof(bounce_ev)); 577 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 578 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 579 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 580 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 581 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 582 bounce_ev.dest.client = client->number; 583 bounce_ev.dest.port = event->source.port; 584 bounce_ev.data.quote.origin = event->dest; 585 bounce_ev.data.quote.event = event; 586 bounce_ev.data.quote.value = -err; /* use positive value */ 587 result = snd_seq_deliver_single_event(NULL, &bounce_ev, atomic, hop + 1); 588 if (result < 0) { 589 client->event_lost++; 590 return result; 591 } 592 593 return result; 594 } 595 596 597 /* 598 * rewrite the time-stamp of the event record with the curren time 599 * of the given queue. 600 * return non-zero if updated. 601 */ 602 static int update_timestamp_of_queue(struct snd_seq_event *event, 603 int queue, int real_time) 604 { 605 struct snd_seq_queue *q; 606 607 q = queueptr(queue); 608 if (! q) 609 return 0; 610 event->queue = queue; 611 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 612 if (real_time) { 613 event->time.time = snd_seq_timer_get_cur_time(q->timer, true); 614 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 615 } else { 616 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 617 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 618 } 619 queuefree(q); 620 return 1; 621 } 622 623 /* deliver a single event; called from below and UMP converter */ 624 int __snd_seq_deliver_single_event(struct snd_seq_client *dest, 625 struct snd_seq_client_port *dest_port, 626 struct snd_seq_event *event, 627 int atomic, int hop) 628 { 629 switch (dest->type) { 630 case USER_CLIENT: 631 if (!dest->data.user.fifo) 632 return 0; 633 return snd_seq_fifo_event_in(dest->data.user.fifo, event); 634 case KERNEL_CLIENT: 635 if (!dest_port->event_input) 636 return 0; 637 return dest_port->event_input(event, 638 snd_seq_ev_is_direct(event), 639 dest_port->private_data, 640 atomic, hop); 641 } 642 return 0; 643 } 644 645 /* 646 * deliver an event to the specified destination. 647 * if filter is non-zero, client filter bitmap is tested. 648 * 649 * RETURN VALUE: 0 : if succeeded 650 * <0 : error 651 */ 652 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 653 struct snd_seq_event *event, 654 int atomic, int hop) 655 { 656 struct snd_seq_client *dest = NULL; 657 struct snd_seq_client_port *dest_port = NULL; 658 int result = -ENOENT; 659 int direct; 660 661 direct = snd_seq_ev_is_direct(event); 662 663 dest = get_event_dest_client(event); 664 if (dest == NULL) 665 goto __skip; 666 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 667 if (dest_port == NULL) 668 goto __skip; 669 670 /* check permission */ 671 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 672 result = -EPERM; 673 goto __skip; 674 } 675 676 if (dest_port->timestamping) 677 update_timestamp_of_queue(event, dest_port->time_queue, 678 dest_port->time_real); 679 680 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 681 if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT)) { 682 if (snd_seq_ev_is_ump(event)) { 683 result = snd_seq_deliver_from_ump(client, dest, dest_port, 684 event, atomic, hop); 685 goto __skip; 686 } else if (snd_seq_client_is_ump(dest)) { 687 result = snd_seq_deliver_to_ump(client, dest, dest_port, 688 event, atomic, hop); 689 goto __skip; 690 } 691 } 692 #endif /* CONFIG_SND_SEQ_UMP */ 693 694 result = __snd_seq_deliver_single_event(dest, dest_port, event, 695 atomic, hop); 696 697 __skip: 698 if (dest_port) 699 snd_seq_port_unlock(dest_port); 700 if (dest) 701 snd_seq_client_unlock(dest); 702 703 if (result < 0 && !direct) { 704 result = bounce_error_event(client, event, result, atomic, hop); 705 } 706 return result; 707 } 708 709 710 /* 711 * send the event to all subscribers: 712 */ 713 static int __deliver_to_subscribers(struct snd_seq_client *client, 714 struct snd_seq_event *event, 715 struct snd_seq_client_port *src_port, 716 int atomic, int hop) 717 { 718 struct snd_seq_subscribers *subs; 719 int err, result = 0, num_ev = 0; 720 union __snd_seq_event event_saved; 721 size_t saved_size; 722 struct snd_seq_port_subs_info *grp; 723 724 /* save original event record */ 725 saved_size = snd_seq_event_packet_size(event); 726 memcpy(&event_saved, event, saved_size); 727 grp = &src_port->c_src; 728 729 /* lock list */ 730 if (atomic) 731 read_lock(&grp->list_lock); 732 else 733 down_read_nested(&grp->list_mutex, hop); 734 list_for_each_entry(subs, &grp->list_head, src_list) { 735 /* both ports ready? */ 736 if (atomic_read(&subs->ref_count) != 2) 737 continue; 738 event->dest = subs->info.dest; 739 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 740 /* convert time according to flag with subscription */ 741 update_timestamp_of_queue(event, subs->info.queue, 742 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 743 err = snd_seq_deliver_single_event(client, event, atomic, hop); 744 if (err < 0) { 745 /* save first error that occurs and continue */ 746 if (!result) 747 result = err; 748 continue; 749 } 750 num_ev++; 751 /* restore original event record */ 752 memcpy(event, &event_saved, saved_size); 753 } 754 if (atomic) 755 read_unlock(&grp->list_lock); 756 else 757 up_read(&grp->list_mutex); 758 memcpy(event, &event_saved, saved_size); 759 return (result < 0) ? result : num_ev; 760 } 761 762 static int deliver_to_subscribers(struct snd_seq_client *client, 763 struct snd_seq_event *event, 764 int atomic, int hop) 765 { 766 struct snd_seq_client_port *src_port; 767 int ret = 0, ret2; 768 769 src_port = snd_seq_port_use_ptr(client, event->source.port); 770 if (src_port) { 771 ret = __deliver_to_subscribers(client, event, src_port, atomic, hop); 772 snd_seq_port_unlock(src_port); 773 } 774 775 if (client->ump_endpoint_port < 0 || 776 event->source.port == client->ump_endpoint_port) 777 return ret; 778 779 src_port = snd_seq_port_use_ptr(client, client->ump_endpoint_port); 780 if (!src_port) 781 return ret; 782 ret2 = __deliver_to_subscribers(client, event, src_port, atomic, hop); 783 snd_seq_port_unlock(src_port); 784 return ret2 < 0 ? ret2 : ret; 785 } 786 787 /* deliver an event to the destination port(s). 788 * if the event is to subscribers or broadcast, the event is dispatched 789 * to multiple targets. 790 * 791 * RETURN VALUE: n > 0 : the number of delivered events. 792 * n == 0 : the event was not passed to any client. 793 * n < 0 : error - event was not processed. 794 */ 795 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 796 int atomic, int hop) 797 { 798 int result; 799 800 hop++; 801 if (hop >= SNDRV_SEQ_MAX_HOPS) { 802 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 803 event->source.client, event->source.port, 804 event->dest.client, event->dest.port); 805 return -EMLINK; 806 } 807 808 if (snd_seq_ev_is_variable(event) && 809 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR))) 810 return -EINVAL; 811 812 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 813 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 814 result = deliver_to_subscribers(client, event, atomic, hop); 815 else 816 result = snd_seq_deliver_single_event(client, event, atomic, hop); 817 818 return result; 819 } 820 821 /* 822 * dispatch an event cell: 823 * This function is called only from queue check routines in timer 824 * interrupts or after enqueued. 825 * The event cell shall be released or re-queued in this function. 826 * 827 * RETURN VALUE: n > 0 : the number of delivered events. 828 * n == 0 : the event was not passed to any client. 829 * n < 0 : error - event was not processed. 830 */ 831 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 832 { 833 struct snd_seq_client *client; 834 int result; 835 836 if (snd_BUG_ON(!cell)) 837 return -EINVAL; 838 839 client = snd_seq_client_use_ptr(cell->event.source.client); 840 if (client == NULL) { 841 snd_seq_cell_free(cell); /* release this cell */ 842 return -EINVAL; 843 } 844 845 if (!snd_seq_ev_is_ump(&cell->event) && 846 cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 847 /* NOTE event: 848 * the event cell is re-used as a NOTE-OFF event and 849 * enqueued again. 850 */ 851 struct snd_seq_event tmpev, *ev; 852 853 /* reserve this event to enqueue note-off later */ 854 tmpev = cell->event; 855 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 856 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 857 858 /* 859 * This was originally a note event. We now re-use the 860 * cell for the note-off event. 861 */ 862 863 ev = &cell->event; 864 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 865 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 866 867 /* add the duration time */ 868 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 869 case SNDRV_SEQ_TIME_STAMP_TICK: 870 cell->event.time.tick += ev->data.note.duration; 871 break; 872 case SNDRV_SEQ_TIME_STAMP_REAL: 873 /* unit for duration is ms */ 874 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 875 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 876 ev->time.time.tv_nsec / 1000000000; 877 ev->time.time.tv_nsec %= 1000000000; 878 break; 879 } 880 ev->data.note.velocity = ev->data.note.off_velocity; 881 882 /* Now queue this cell as the note off event */ 883 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 884 snd_seq_cell_free(cell); /* release this cell */ 885 886 } else { 887 /* Normal events: 888 * event cell is freed after processing the event 889 */ 890 891 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 892 snd_seq_cell_free(cell); 893 } 894 895 snd_seq_client_unlock(client); 896 return result; 897 } 898 899 900 /* Allocate a cell from client pool and enqueue it to queue: 901 * if pool is empty and blocking is TRUE, sleep until a new cell is 902 * available. 903 */ 904 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 905 struct snd_seq_event *event, 906 struct file *file, int blocking, 907 int atomic, int hop, 908 struct mutex *mutexp) 909 { 910 struct snd_seq_event_cell *cell; 911 int err; 912 913 /* special queue values - force direct passing */ 914 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 915 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 916 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 917 } else if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 918 /* check presence of source port */ 919 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 920 if (src_port == NULL) 921 return -EINVAL; 922 snd_seq_port_unlock(src_port); 923 } 924 925 /* direct event processing without enqueued */ 926 if (snd_seq_ev_is_direct(event)) { 927 if (!snd_seq_ev_is_ump(event) && 928 event->type == SNDRV_SEQ_EVENT_NOTE) 929 return -EINVAL; /* this event must be enqueued! */ 930 return snd_seq_deliver_event(client, event, atomic, hop); 931 } 932 933 /* Not direct, normal queuing */ 934 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 935 return -EINVAL; /* invalid queue */ 936 if (! snd_seq_write_pool_allocated(client)) 937 return -ENXIO; /* queue is not allocated */ 938 939 /* allocate an event cell */ 940 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, 941 file, mutexp); 942 if (err < 0) 943 return err; 944 945 /* we got a cell. enqueue it. */ 946 err = snd_seq_enqueue_event(cell, atomic, hop); 947 if (err < 0) { 948 snd_seq_cell_free(cell); 949 return err; 950 } 951 952 return 0; 953 } 954 955 956 /* 957 * check validity of event type and data length. 958 * return non-zero if invalid. 959 */ 960 static int check_event_type_and_length(struct snd_seq_event *ev) 961 { 962 switch (snd_seq_ev_length_type(ev)) { 963 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 964 if (snd_seq_ev_is_variable_type(ev)) 965 return -EINVAL; 966 break; 967 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 968 if (! snd_seq_ev_is_variable_type(ev) || 969 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 970 return -EINVAL; 971 break; 972 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 973 if (! snd_seq_ev_is_direct(ev)) 974 return -EINVAL; 975 break; 976 } 977 return 0; 978 } 979 980 981 /* handle write() */ 982 /* possible error values: 983 * -ENXIO invalid client or file open mode 984 * -ENOMEM malloc failed 985 * -EFAULT seg. fault during copy from user space 986 * -EINVAL invalid event 987 * -EAGAIN no space in output pool 988 * -EINTR interrupts while sleep 989 * -EMLINK too many hops 990 * others depends on return value from driver callback 991 */ 992 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 993 size_t count, loff_t *offset) 994 { 995 struct snd_seq_client *client = file->private_data; 996 int written = 0, len; 997 int err, handled; 998 union __snd_seq_event __event; 999 struct snd_seq_event *ev = &__event.legacy; 1000 1001 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1002 return -ENXIO; 1003 1004 /* check client structures are in place */ 1005 if (snd_BUG_ON(!client)) 1006 return -ENXIO; 1007 1008 if (!client->accept_output || client->pool == NULL) 1009 return -ENXIO; 1010 1011 repeat: 1012 handled = 0; 1013 /* allocate the pool now if the pool is not allocated yet */ 1014 mutex_lock(&client->ioctl_mutex); 1015 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1016 err = snd_seq_pool_init(client->pool); 1017 if (err < 0) 1018 goto out; 1019 } 1020 1021 /* only process whole events */ 1022 err = -EINVAL; 1023 while (count >= sizeof(struct snd_seq_event)) { 1024 /* Read in the event header from the user */ 1025 len = sizeof(struct snd_seq_event); 1026 if (copy_from_user(ev, buf, len)) { 1027 err = -EFAULT; 1028 break; 1029 } 1030 /* read in the rest bytes for UMP events */ 1031 if (snd_seq_ev_is_ump(ev)) { 1032 if (count < sizeof(struct snd_seq_ump_event)) 1033 break; 1034 if (copy_from_user((char *)ev + len, buf + len, 1035 sizeof(struct snd_seq_ump_event) - len)) { 1036 err = -EFAULT; 1037 break; 1038 } 1039 len = sizeof(struct snd_seq_ump_event); 1040 } 1041 1042 ev->source.client = client->number; /* fill in client number */ 1043 /* Check for extension data length */ 1044 if (check_event_type_and_length(ev)) { 1045 err = -EINVAL; 1046 break; 1047 } 1048 1049 if (!event_is_compatible(client, ev)) { 1050 err = -EINVAL; 1051 break; 1052 } 1053 1054 /* check for special events */ 1055 if (!snd_seq_ev_is_ump(ev)) { 1056 if (ev->type == SNDRV_SEQ_EVENT_NONE) 1057 goto __skip_event; 1058 else if (snd_seq_ev_is_reserved(ev)) { 1059 err = -EINVAL; 1060 break; 1061 } 1062 } 1063 1064 if (snd_seq_ev_is_variable(ev)) { 1065 int extlen = ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1066 if ((size_t)(extlen + len) > count) { 1067 /* back out, will get an error this time or next */ 1068 err = -EINVAL; 1069 break; 1070 } 1071 /* set user space pointer */ 1072 ev->data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1073 ev->data.ext.ptr = (char __force *)buf + len; 1074 len += extlen; /* increment data length */ 1075 } else { 1076 #ifdef CONFIG_COMPAT 1077 if (client->convert32 && snd_seq_ev_is_varusr(ev)) 1078 ev->data.ext.ptr = 1079 (void __force *)compat_ptr(ev->data.raw32.d[1]); 1080 #endif 1081 } 1082 1083 /* ok, enqueue it */ 1084 err = snd_seq_client_enqueue_event(client, ev, file, 1085 !(file->f_flags & O_NONBLOCK), 1086 0, 0, &client->ioctl_mutex); 1087 if (err < 0) 1088 break; 1089 handled++; 1090 1091 __skip_event: 1092 /* Update pointers and counts */ 1093 count -= len; 1094 buf += len; 1095 written += len; 1096 1097 /* let's have a coffee break if too many events are queued */ 1098 if (++handled >= 200) { 1099 mutex_unlock(&client->ioctl_mutex); 1100 goto repeat; 1101 } 1102 } 1103 1104 out: 1105 mutex_unlock(&client->ioctl_mutex); 1106 return written ? written : err; 1107 } 1108 1109 1110 /* 1111 * handle polling 1112 */ 1113 static __poll_t snd_seq_poll(struct file *file, poll_table * wait) 1114 { 1115 struct snd_seq_client *client = file->private_data; 1116 __poll_t mask = 0; 1117 1118 /* check client structures are in place */ 1119 if (snd_BUG_ON(!client)) 1120 return EPOLLERR; 1121 1122 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1123 client->data.user.fifo) { 1124 1125 /* check if data is available in the outqueue */ 1126 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1127 mask |= EPOLLIN | EPOLLRDNORM; 1128 } 1129 1130 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1131 1132 /* check if data is available in the pool */ 1133 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 1134 mask |= EPOLLOUT | EPOLLWRNORM; 1135 } 1136 1137 return mask; 1138 } 1139 1140 1141 /*-----------------------------------------------------*/ 1142 1143 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg) 1144 { 1145 int *pversion = arg; 1146 1147 *pversion = SNDRV_SEQ_VERSION; 1148 return 0; 1149 } 1150 1151 static int snd_seq_ioctl_user_pversion(struct snd_seq_client *client, void *arg) 1152 { 1153 client->user_pversion = *(unsigned int *)arg; 1154 return 0; 1155 } 1156 1157 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg) 1158 { 1159 int *client_id = arg; 1160 1161 *client_id = client->number; 1162 return 0; 1163 } 1164 1165 /* SYSTEM_INFO ioctl() */ 1166 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg) 1167 { 1168 struct snd_seq_system_info *info = arg; 1169 1170 memset(info, 0, sizeof(*info)); 1171 /* fill the info fields */ 1172 info->queues = SNDRV_SEQ_MAX_QUEUES; 1173 info->clients = SNDRV_SEQ_MAX_CLIENTS; 1174 info->ports = SNDRV_SEQ_MAX_PORTS; 1175 info->channels = 256; /* fixed limit */ 1176 info->cur_clients = client_usage.cur; 1177 info->cur_queues = snd_seq_queue_get_cur_queues(); 1178 1179 return 0; 1180 } 1181 1182 1183 /* RUNNING_MODE ioctl() */ 1184 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg) 1185 { 1186 struct snd_seq_running_info *info = arg; 1187 struct snd_seq_client *cptr; 1188 int err = 0; 1189 1190 /* requested client number */ 1191 cptr = snd_seq_client_use_ptr(info->client); 1192 if (cptr == NULL) 1193 return -ENOENT; /* don't change !!! */ 1194 1195 #ifdef SNDRV_BIG_ENDIAN 1196 if (!info->big_endian) { 1197 err = -EINVAL; 1198 goto __err; 1199 } 1200 #else 1201 if (info->big_endian) { 1202 err = -EINVAL; 1203 goto __err; 1204 } 1205 1206 #endif 1207 if (info->cpu_mode > sizeof(long)) { 1208 err = -EINVAL; 1209 goto __err; 1210 } 1211 cptr->convert32 = (info->cpu_mode < sizeof(long)); 1212 __err: 1213 snd_seq_client_unlock(cptr); 1214 return err; 1215 } 1216 1217 /* CLIENT_INFO ioctl() */ 1218 static void get_client_info(struct snd_seq_client *cptr, 1219 struct snd_seq_client_info *info) 1220 { 1221 info->client = cptr->number; 1222 1223 /* fill the info fields */ 1224 info->type = cptr->type; 1225 strcpy(info->name, cptr->name); 1226 info->filter = cptr->filter; 1227 info->event_lost = cptr->event_lost; 1228 memcpy(info->event_filter, cptr->event_filter, 32); 1229 info->group_filter = cptr->group_filter; 1230 info->num_ports = cptr->num_ports; 1231 1232 if (cptr->type == USER_CLIENT) 1233 info->pid = pid_vnr(cptr->data.user.owner); 1234 else 1235 info->pid = -1; 1236 1237 if (cptr->type == KERNEL_CLIENT) 1238 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; 1239 else 1240 info->card = -1; 1241 1242 info->midi_version = cptr->midi_version; 1243 memset(info->reserved, 0, sizeof(info->reserved)); 1244 } 1245 1246 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1247 void *arg) 1248 { 1249 struct snd_seq_client_info *client_info = arg; 1250 struct snd_seq_client *cptr; 1251 1252 /* requested client number */ 1253 cptr = snd_seq_client_use_ptr(client_info->client); 1254 if (cptr == NULL) 1255 return -ENOENT; /* don't change !!! */ 1256 1257 get_client_info(cptr, client_info); 1258 snd_seq_client_unlock(cptr); 1259 1260 return 0; 1261 } 1262 1263 1264 /* CLIENT_INFO ioctl() */ 1265 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1266 void *arg) 1267 { 1268 struct snd_seq_client_info *client_info = arg; 1269 1270 /* it is not allowed to set the info fields for an another client */ 1271 if (client->number != client_info->client) 1272 return -EPERM; 1273 /* also client type must be set now */ 1274 if (client->type != client_info->type) 1275 return -EINVAL; 1276 1277 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) { 1278 /* check validity of midi_version field */ 1279 if (client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0) 1280 return -EINVAL; 1281 1282 /* check if UMP is supported in kernel */ 1283 if (!IS_ENABLED(CONFIG_SND_SEQ_UMP) && 1284 client_info->midi_version > 0) 1285 return -EINVAL; 1286 } 1287 1288 /* fill the info fields */ 1289 if (client_info->name[0]) 1290 strscpy(client->name, client_info->name, sizeof(client->name)); 1291 1292 client->filter = client_info->filter; 1293 client->event_lost = client_info->event_lost; 1294 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) 1295 client->midi_version = client_info->midi_version; 1296 memcpy(client->event_filter, client_info->event_filter, 32); 1297 client->group_filter = client_info->group_filter; 1298 1299 /* notify the change */ 1300 snd_seq_system_client_ev_client_change(client->number); 1301 1302 return 0; 1303 } 1304 1305 1306 /* 1307 * CREATE PORT ioctl() 1308 */ 1309 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg) 1310 { 1311 struct snd_seq_port_info *info = arg; 1312 struct snd_seq_client_port *port; 1313 struct snd_seq_port_callback *callback; 1314 int port_idx, err; 1315 1316 /* it is not allowed to create the port for an another client */ 1317 if (info->addr.client != client->number) 1318 return -EPERM; 1319 if (client->type == USER_CLIENT && info->kernel) 1320 return -EINVAL; 1321 if ((info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) && 1322 client->ump_endpoint_port >= 0) 1323 return -EBUSY; 1324 1325 if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) 1326 port_idx = info->addr.port; 1327 else 1328 port_idx = -1; 1329 if (port_idx >= SNDRV_SEQ_ADDRESS_UNKNOWN) 1330 return -EINVAL; 1331 err = snd_seq_create_port(client, port_idx, &port); 1332 if (err < 0) 1333 return err; 1334 1335 if (client->type == KERNEL_CLIENT) { 1336 callback = info->kernel; 1337 if (callback) { 1338 if (callback->owner) 1339 port->owner = callback->owner; 1340 port->private_data = callback->private_data; 1341 port->private_free = callback->private_free; 1342 port->event_input = callback->event_input; 1343 port->c_src.open = callback->subscribe; 1344 port->c_src.close = callback->unsubscribe; 1345 port->c_dest.open = callback->use; 1346 port->c_dest.close = callback->unuse; 1347 } 1348 } 1349 1350 info->addr = port->addr; 1351 1352 snd_seq_set_port_info(port, info); 1353 if (info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) 1354 client->ump_endpoint_port = port->addr.port; 1355 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1356 snd_seq_port_unlock(port); 1357 1358 return 0; 1359 } 1360 1361 /* 1362 * DELETE PORT ioctl() 1363 */ 1364 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg) 1365 { 1366 struct snd_seq_port_info *info = arg; 1367 int err; 1368 1369 /* it is not allowed to remove the port for an another client */ 1370 if (info->addr.client != client->number) 1371 return -EPERM; 1372 1373 err = snd_seq_delete_port(client, info->addr.port); 1374 if (err >= 0) { 1375 if (client->ump_endpoint_port == info->addr.port) 1376 client->ump_endpoint_port = -1; 1377 snd_seq_system_client_ev_port_exit(client->number, info->addr.port); 1378 } 1379 return err; 1380 } 1381 1382 1383 /* 1384 * GET_PORT_INFO ioctl() (on any client) 1385 */ 1386 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg) 1387 { 1388 struct snd_seq_port_info *info = arg; 1389 struct snd_seq_client *cptr; 1390 struct snd_seq_client_port *port; 1391 1392 cptr = snd_seq_client_use_ptr(info->addr.client); 1393 if (cptr == NULL) 1394 return -ENXIO; 1395 1396 port = snd_seq_port_use_ptr(cptr, info->addr.port); 1397 if (port == NULL) { 1398 snd_seq_client_unlock(cptr); 1399 return -ENOENT; /* don't change */ 1400 } 1401 1402 /* get port info */ 1403 snd_seq_get_port_info(port, info); 1404 snd_seq_port_unlock(port); 1405 snd_seq_client_unlock(cptr); 1406 1407 return 0; 1408 } 1409 1410 1411 /* 1412 * SET_PORT_INFO ioctl() (only ports on this/own client) 1413 */ 1414 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg) 1415 { 1416 struct snd_seq_port_info *info = arg; 1417 struct snd_seq_client_port *port; 1418 1419 if (info->addr.client != client->number) /* only set our own ports ! */ 1420 return -EPERM; 1421 port = snd_seq_port_use_ptr(client, info->addr.port); 1422 if (port) { 1423 snd_seq_set_port_info(port, info); 1424 snd_seq_port_unlock(port); 1425 /* notify the change */ 1426 snd_seq_system_client_ev_port_change(info->addr.client, 1427 info->addr.port); 1428 } 1429 return 0; 1430 } 1431 1432 1433 /* 1434 * port subscription (connection) 1435 */ 1436 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1437 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1438 1439 static int check_subscription_permission(struct snd_seq_client *client, 1440 struct snd_seq_client_port *sport, 1441 struct snd_seq_client_port *dport, 1442 struct snd_seq_port_subscribe *subs) 1443 { 1444 if (client->number != subs->sender.client && 1445 client->number != subs->dest.client) { 1446 /* connection by third client - check export permission */ 1447 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1448 return -EPERM; 1449 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1450 return -EPERM; 1451 } 1452 1453 /* check read permission */ 1454 /* if sender or receiver is the subscribing client itself, 1455 * no permission check is necessary 1456 */ 1457 if (client->number != subs->sender.client) { 1458 if (! check_port_perm(sport, PERM_RD)) 1459 return -EPERM; 1460 } 1461 /* check write permission */ 1462 if (client->number != subs->dest.client) { 1463 if (! check_port_perm(dport, PERM_WR)) 1464 return -EPERM; 1465 } 1466 return 0; 1467 } 1468 1469 /* 1470 * send an subscription notify event to user client: 1471 * client must be user client. 1472 */ 1473 int snd_seq_client_notify_subscription(int client, int port, 1474 struct snd_seq_port_subscribe *info, 1475 int evtype) 1476 { 1477 struct snd_seq_event event; 1478 1479 memset(&event, 0, sizeof(event)); 1480 event.type = evtype; 1481 event.data.connect.dest = info->dest; 1482 event.data.connect.sender = info->sender; 1483 1484 return snd_seq_system_notify(client, port, &event, false); /* non-atomic */ 1485 } 1486 1487 1488 /* 1489 * add to port's subscription list IOCTL interface 1490 */ 1491 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1492 void *arg) 1493 { 1494 struct snd_seq_port_subscribe *subs = arg; 1495 int result = -EINVAL; 1496 struct snd_seq_client *receiver = NULL, *sender = NULL; 1497 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1498 1499 receiver = snd_seq_client_use_ptr(subs->dest.client); 1500 if (!receiver) 1501 goto __end; 1502 sender = snd_seq_client_use_ptr(subs->sender.client); 1503 if (!sender) 1504 goto __end; 1505 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1506 if (!sport) 1507 goto __end; 1508 dport = snd_seq_port_use_ptr(receiver, subs->dest.port); 1509 if (!dport) 1510 goto __end; 1511 1512 result = check_subscription_permission(client, sport, dport, subs); 1513 if (result < 0) 1514 goto __end; 1515 1516 /* connect them */ 1517 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs); 1518 if (! result) /* broadcast announce */ 1519 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1520 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1521 __end: 1522 if (sport) 1523 snd_seq_port_unlock(sport); 1524 if (dport) 1525 snd_seq_port_unlock(dport); 1526 if (sender) 1527 snd_seq_client_unlock(sender); 1528 if (receiver) 1529 snd_seq_client_unlock(receiver); 1530 return result; 1531 } 1532 1533 1534 /* 1535 * remove from port's subscription list 1536 */ 1537 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1538 void *arg) 1539 { 1540 struct snd_seq_port_subscribe *subs = arg; 1541 int result = -ENXIO; 1542 struct snd_seq_client *receiver = NULL, *sender = NULL; 1543 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1544 1545 receiver = snd_seq_client_use_ptr(subs->dest.client); 1546 if (!receiver) 1547 goto __end; 1548 sender = snd_seq_client_use_ptr(subs->sender.client); 1549 if (!sender) 1550 goto __end; 1551 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1552 if (!sport) 1553 goto __end; 1554 dport = snd_seq_port_use_ptr(receiver, subs->dest.port); 1555 if (!dport) 1556 goto __end; 1557 1558 result = check_subscription_permission(client, sport, dport, subs); 1559 if (result < 0) 1560 goto __end; 1561 1562 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs); 1563 if (! result) /* broadcast announce */ 1564 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1565 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1566 __end: 1567 if (sport) 1568 snd_seq_port_unlock(sport); 1569 if (dport) 1570 snd_seq_port_unlock(dport); 1571 if (sender) 1572 snd_seq_client_unlock(sender); 1573 if (receiver) 1574 snd_seq_client_unlock(receiver); 1575 return result; 1576 } 1577 1578 1579 /* CREATE_QUEUE ioctl() */ 1580 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg) 1581 { 1582 struct snd_seq_queue_info *info = arg; 1583 struct snd_seq_queue *q; 1584 1585 q = snd_seq_queue_alloc(client->number, info->locked, info->flags); 1586 if (IS_ERR(q)) 1587 return PTR_ERR(q); 1588 1589 info->queue = q->queue; 1590 info->locked = q->locked; 1591 info->owner = q->owner; 1592 1593 /* set queue name */ 1594 if (!info->name[0]) 1595 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue); 1596 strscpy(q->name, info->name, sizeof(q->name)); 1597 snd_use_lock_free(&q->use_lock); 1598 1599 return 0; 1600 } 1601 1602 /* DELETE_QUEUE ioctl() */ 1603 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg) 1604 { 1605 struct snd_seq_queue_info *info = arg; 1606 1607 return snd_seq_queue_delete(client->number, info->queue); 1608 } 1609 1610 /* GET_QUEUE_INFO ioctl() */ 1611 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1612 void *arg) 1613 { 1614 struct snd_seq_queue_info *info = arg; 1615 struct snd_seq_queue *q; 1616 1617 q = queueptr(info->queue); 1618 if (q == NULL) 1619 return -EINVAL; 1620 1621 memset(info, 0, sizeof(*info)); 1622 info->queue = q->queue; 1623 info->owner = q->owner; 1624 info->locked = q->locked; 1625 strscpy(info->name, q->name, sizeof(info->name)); 1626 queuefree(q); 1627 1628 return 0; 1629 } 1630 1631 /* SET_QUEUE_INFO ioctl() */ 1632 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1633 void *arg) 1634 { 1635 struct snd_seq_queue_info *info = arg; 1636 struct snd_seq_queue *q; 1637 1638 if (info->owner != client->number) 1639 return -EINVAL; 1640 1641 /* change owner/locked permission */ 1642 if (snd_seq_queue_check_access(info->queue, client->number)) { 1643 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0) 1644 return -EPERM; 1645 if (info->locked) 1646 snd_seq_queue_use(info->queue, client->number, 1); 1647 } else { 1648 return -EPERM; 1649 } 1650 1651 q = queueptr(info->queue); 1652 if (! q) 1653 return -EINVAL; 1654 if (q->owner != client->number) { 1655 queuefree(q); 1656 return -EPERM; 1657 } 1658 strscpy(q->name, info->name, sizeof(q->name)); 1659 queuefree(q); 1660 1661 return 0; 1662 } 1663 1664 /* GET_NAMED_QUEUE ioctl() */ 1665 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, 1666 void *arg) 1667 { 1668 struct snd_seq_queue_info *info = arg; 1669 struct snd_seq_queue *q; 1670 1671 q = snd_seq_queue_find_name(info->name); 1672 if (q == NULL) 1673 return -EINVAL; 1674 info->queue = q->queue; 1675 info->owner = q->owner; 1676 info->locked = q->locked; 1677 queuefree(q); 1678 1679 return 0; 1680 } 1681 1682 /* GET_QUEUE_STATUS ioctl() */ 1683 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1684 void *arg) 1685 { 1686 struct snd_seq_queue_status *status = arg; 1687 struct snd_seq_queue *queue; 1688 struct snd_seq_timer *tmr; 1689 1690 queue = queueptr(status->queue); 1691 if (queue == NULL) 1692 return -EINVAL; 1693 memset(status, 0, sizeof(*status)); 1694 status->queue = queue->queue; 1695 1696 tmr = queue->timer; 1697 status->events = queue->tickq->cells + queue->timeq->cells; 1698 1699 status->time = snd_seq_timer_get_cur_time(tmr, true); 1700 status->tick = snd_seq_timer_get_cur_tick(tmr); 1701 1702 status->running = tmr->running; 1703 1704 status->flags = queue->flags; 1705 queuefree(queue); 1706 1707 return 0; 1708 } 1709 1710 1711 /* GET_QUEUE_TEMPO ioctl() */ 1712 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1713 void *arg) 1714 { 1715 struct snd_seq_queue_tempo *tempo = arg; 1716 struct snd_seq_queue *queue; 1717 struct snd_seq_timer *tmr; 1718 1719 queue = queueptr(tempo->queue); 1720 if (queue == NULL) 1721 return -EINVAL; 1722 memset(tempo, 0, sizeof(*tempo)); 1723 tempo->queue = queue->queue; 1724 1725 tmr = queue->timer; 1726 1727 tempo->tempo = tmr->tempo; 1728 tempo->ppq = tmr->ppq; 1729 tempo->skew_value = tmr->skew; 1730 tempo->skew_base = tmr->skew_base; 1731 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 4)) 1732 tempo->tempo_base = tmr->tempo_base; 1733 queuefree(queue); 1734 1735 return 0; 1736 } 1737 1738 1739 /* SET_QUEUE_TEMPO ioctl() */ 1740 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1741 { 1742 if (!snd_seq_queue_check_access(tempo->queue, client)) 1743 return -EPERM; 1744 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1745 } 1746 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1747 1748 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1749 void *arg) 1750 { 1751 struct snd_seq_queue_tempo *tempo = arg; 1752 int result; 1753 1754 if (client->user_pversion < SNDRV_PROTOCOL_VERSION(1, 0, 4)) 1755 tempo->tempo_base = 0; 1756 result = snd_seq_set_queue_tempo(client->number, tempo); 1757 return result < 0 ? result : 0; 1758 } 1759 1760 1761 /* GET_QUEUE_TIMER ioctl() */ 1762 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1763 void *arg) 1764 { 1765 struct snd_seq_queue_timer *timer = arg; 1766 struct snd_seq_queue *queue; 1767 struct snd_seq_timer *tmr; 1768 1769 queue = queueptr(timer->queue); 1770 if (queue == NULL) 1771 return -EINVAL; 1772 1773 mutex_lock(&queue->timer_mutex); 1774 tmr = queue->timer; 1775 memset(timer, 0, sizeof(*timer)); 1776 timer->queue = queue->queue; 1777 1778 timer->type = tmr->type; 1779 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1780 timer->u.alsa.id = tmr->alsa_id; 1781 timer->u.alsa.resolution = tmr->preferred_resolution; 1782 } 1783 mutex_unlock(&queue->timer_mutex); 1784 queuefree(queue); 1785 1786 return 0; 1787 } 1788 1789 1790 /* SET_QUEUE_TIMER ioctl() */ 1791 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1792 void *arg) 1793 { 1794 struct snd_seq_queue_timer *timer = arg; 1795 int result = 0; 1796 1797 if (timer->type != SNDRV_SEQ_TIMER_ALSA) 1798 return -EINVAL; 1799 1800 if (snd_seq_queue_check_access(timer->queue, client->number)) { 1801 struct snd_seq_queue *q; 1802 struct snd_seq_timer *tmr; 1803 1804 q = queueptr(timer->queue); 1805 if (q == NULL) 1806 return -ENXIO; 1807 mutex_lock(&q->timer_mutex); 1808 tmr = q->timer; 1809 snd_seq_queue_timer_close(timer->queue); 1810 tmr->type = timer->type; 1811 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1812 tmr->alsa_id = timer->u.alsa.id; 1813 tmr->preferred_resolution = timer->u.alsa.resolution; 1814 } 1815 result = snd_seq_queue_timer_open(timer->queue); 1816 mutex_unlock(&q->timer_mutex); 1817 queuefree(q); 1818 } else { 1819 return -EPERM; 1820 } 1821 1822 return result; 1823 } 1824 1825 1826 /* GET_QUEUE_CLIENT ioctl() */ 1827 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1828 void *arg) 1829 { 1830 struct snd_seq_queue_client *info = arg; 1831 int used; 1832 1833 used = snd_seq_queue_is_used(info->queue, client->number); 1834 if (used < 0) 1835 return -EINVAL; 1836 info->used = used; 1837 info->client = client->number; 1838 1839 return 0; 1840 } 1841 1842 1843 /* SET_QUEUE_CLIENT ioctl() */ 1844 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1845 void *arg) 1846 { 1847 struct snd_seq_queue_client *info = arg; 1848 int err; 1849 1850 if (info->used >= 0) { 1851 err = snd_seq_queue_use(info->queue, client->number, info->used); 1852 if (err < 0) 1853 return err; 1854 } 1855 1856 return snd_seq_ioctl_get_queue_client(client, arg); 1857 } 1858 1859 1860 /* GET_CLIENT_POOL ioctl() */ 1861 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1862 void *arg) 1863 { 1864 struct snd_seq_client_pool *info = arg; 1865 struct snd_seq_client *cptr; 1866 1867 cptr = snd_seq_client_use_ptr(info->client); 1868 if (cptr == NULL) 1869 return -ENOENT; 1870 memset(info, 0, sizeof(*info)); 1871 info->client = cptr->number; 1872 info->output_pool = cptr->pool->size; 1873 info->output_room = cptr->pool->room; 1874 info->output_free = info->output_pool; 1875 info->output_free = snd_seq_unused_cells(cptr->pool); 1876 if (cptr->type == USER_CLIENT) { 1877 info->input_pool = cptr->data.user.fifo_pool_size; 1878 info->input_free = info->input_pool; 1879 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo); 1880 } else { 1881 info->input_pool = 0; 1882 info->input_free = 0; 1883 } 1884 snd_seq_client_unlock(cptr); 1885 1886 return 0; 1887 } 1888 1889 /* SET_CLIENT_POOL ioctl() */ 1890 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1891 void *arg) 1892 { 1893 struct snd_seq_client_pool *info = arg; 1894 int rc; 1895 1896 if (client->number != info->client) 1897 return -EINVAL; /* can't change other clients */ 1898 1899 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS && 1900 (! snd_seq_write_pool_allocated(client) || 1901 info->output_pool != client->pool->size)) { 1902 if (snd_seq_write_pool_allocated(client)) { 1903 /* is the pool in use? */ 1904 if (atomic_read(&client->pool->counter)) 1905 return -EBUSY; 1906 /* remove all existing cells */ 1907 snd_seq_pool_mark_closing(client->pool); 1908 snd_seq_pool_done(client->pool); 1909 } 1910 client->pool->size = info->output_pool; 1911 rc = snd_seq_pool_init(client->pool); 1912 if (rc < 0) 1913 return rc; 1914 } 1915 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1916 info->input_pool >= 1 && 1917 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1918 info->input_pool != client->data.user.fifo_pool_size) { 1919 /* change pool size */ 1920 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool); 1921 if (rc < 0) 1922 return rc; 1923 client->data.user.fifo_pool_size = info->input_pool; 1924 } 1925 if (info->output_room >= 1 && 1926 info->output_room <= client->pool->size) { 1927 client->pool->room = info->output_room; 1928 } 1929 1930 return snd_seq_ioctl_get_client_pool(client, arg); 1931 } 1932 1933 1934 /* REMOVE_EVENTS ioctl() */ 1935 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1936 void *arg) 1937 { 1938 struct snd_seq_remove_events *info = arg; 1939 1940 /* 1941 * Input mostly not implemented XXX. 1942 */ 1943 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1944 /* 1945 * No restrictions so for a user client we can clear 1946 * the whole fifo 1947 */ 1948 if (client->type == USER_CLIENT && client->data.user.fifo) 1949 snd_seq_fifo_clear(client->data.user.fifo); 1950 } 1951 1952 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1953 snd_seq_queue_remove_cells(client->number, info); 1954 1955 return 0; 1956 } 1957 1958 1959 /* 1960 * get subscription info 1961 */ 1962 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1963 void *arg) 1964 { 1965 struct snd_seq_port_subscribe *subs = arg; 1966 int result; 1967 struct snd_seq_client *sender = NULL; 1968 struct snd_seq_client_port *sport = NULL; 1969 1970 result = -EINVAL; 1971 sender = snd_seq_client_use_ptr(subs->sender.client); 1972 if (!sender) 1973 goto __end; 1974 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1975 if (!sport) 1976 goto __end; 1977 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest, 1978 subs); 1979 __end: 1980 if (sport) 1981 snd_seq_port_unlock(sport); 1982 if (sender) 1983 snd_seq_client_unlock(sender); 1984 1985 return result; 1986 } 1987 1988 1989 /* 1990 * get subscription info - check only its presence 1991 */ 1992 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg) 1993 { 1994 struct snd_seq_query_subs *subs = arg; 1995 int result = -ENXIO; 1996 struct snd_seq_client *cptr = NULL; 1997 struct snd_seq_client_port *port = NULL; 1998 struct snd_seq_port_subs_info *group; 1999 struct list_head *p; 2000 int i; 2001 2002 cptr = snd_seq_client_use_ptr(subs->root.client); 2003 if (!cptr) 2004 goto __end; 2005 port = snd_seq_port_use_ptr(cptr, subs->root.port); 2006 if (!port) 2007 goto __end; 2008 2009 switch (subs->type) { 2010 case SNDRV_SEQ_QUERY_SUBS_READ: 2011 group = &port->c_src; 2012 break; 2013 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2014 group = &port->c_dest; 2015 break; 2016 default: 2017 goto __end; 2018 } 2019 2020 down_read(&group->list_mutex); 2021 /* search for the subscriber */ 2022 subs->num_subs = group->count; 2023 i = 0; 2024 result = -ENOENT; 2025 list_for_each(p, &group->list_head) { 2026 if (i++ == subs->index) { 2027 /* found! */ 2028 struct snd_seq_subscribers *s; 2029 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) { 2030 s = list_entry(p, struct snd_seq_subscribers, src_list); 2031 subs->addr = s->info.dest; 2032 } else { 2033 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2034 subs->addr = s->info.sender; 2035 } 2036 subs->flags = s->info.flags; 2037 subs->queue = s->info.queue; 2038 result = 0; 2039 break; 2040 } 2041 } 2042 up_read(&group->list_mutex); 2043 2044 __end: 2045 if (port) 2046 snd_seq_port_unlock(port); 2047 if (cptr) 2048 snd_seq_client_unlock(cptr); 2049 2050 return result; 2051 } 2052 2053 2054 /* 2055 * query next client 2056 */ 2057 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2058 void *arg) 2059 { 2060 struct snd_seq_client_info *info = arg; 2061 struct snd_seq_client *cptr = NULL; 2062 2063 /* search for next client */ 2064 if (info->client < INT_MAX) 2065 info->client++; 2066 if (info->client < 0) 2067 info->client = 0; 2068 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) { 2069 cptr = snd_seq_client_use_ptr(info->client); 2070 if (cptr) 2071 break; /* found */ 2072 } 2073 if (cptr == NULL) 2074 return -ENOENT; 2075 2076 get_client_info(cptr, info); 2077 snd_seq_client_unlock(cptr); 2078 2079 return 0; 2080 } 2081 2082 /* 2083 * query next port 2084 */ 2085 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2086 void *arg) 2087 { 2088 struct snd_seq_port_info *info = arg; 2089 struct snd_seq_client *cptr; 2090 struct snd_seq_client_port *port = NULL; 2091 2092 cptr = snd_seq_client_use_ptr(info->addr.client); 2093 if (cptr == NULL) 2094 return -ENXIO; 2095 2096 /* search for next port */ 2097 info->addr.port++; 2098 port = snd_seq_port_query_nearest(cptr, info); 2099 if (port == NULL) { 2100 snd_seq_client_unlock(cptr); 2101 return -ENOENT; 2102 } 2103 2104 /* get port info */ 2105 info->addr = port->addr; 2106 snd_seq_get_port_info(port, info); 2107 snd_seq_port_unlock(port); 2108 snd_seq_client_unlock(cptr); 2109 2110 return 0; 2111 } 2112 2113 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2114 #define NUM_UMP_INFOS (SNDRV_UMP_MAX_BLOCKS + 1) 2115 2116 static void free_ump_info(struct snd_seq_client *client) 2117 { 2118 int i; 2119 2120 if (!client->ump_info) 2121 return; 2122 for (i = 0; i < NUM_UMP_INFOS; i++) 2123 kfree(client->ump_info[i]); 2124 kfree(client->ump_info); 2125 client->ump_info = NULL; 2126 } 2127 2128 static void terminate_ump_info_strings(void *p, int type) 2129 { 2130 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) { 2131 struct snd_ump_endpoint_info *ep = p; 2132 ep->name[sizeof(ep->name) - 1] = 0; 2133 } else { 2134 struct snd_ump_block_info *bp = p; 2135 bp->name[sizeof(bp->name) - 1] = 0; 2136 } 2137 } 2138 2139 #ifdef CONFIG_SND_PROC_FS 2140 static void dump_ump_info(struct snd_info_buffer *buffer, 2141 struct snd_seq_client *client) 2142 { 2143 struct snd_ump_endpoint_info *ep; 2144 struct snd_ump_block_info *bp; 2145 int i; 2146 2147 if (!client->ump_info) 2148 return; 2149 ep = client->ump_info[SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT]; 2150 if (ep && *ep->name) 2151 snd_iprintf(buffer, " UMP Endpoint: \"%s\"\n", ep->name); 2152 for (i = 0; i < SNDRV_UMP_MAX_BLOCKS; i++) { 2153 bp = client->ump_info[i + 1]; 2154 if (bp && *bp->name) { 2155 snd_iprintf(buffer, " UMP Block %d: \"%s\" [%s]\n", 2156 i, bp->name, 2157 bp->active ? "Active" : "Inactive"); 2158 snd_iprintf(buffer, " Groups: %d-%d\n", 2159 bp->first_group + 1, 2160 bp->first_group + bp->num_groups); 2161 } 2162 } 2163 } 2164 #endif 2165 2166 /* UMP-specific ioctls -- called directly without data copy */ 2167 static int snd_seq_ioctl_client_ump_info(struct snd_seq_client *caller, 2168 unsigned int cmd, 2169 unsigned long arg) 2170 { 2171 struct snd_seq_client_ump_info __user *argp = 2172 (struct snd_seq_client_ump_info __user *)arg; 2173 struct snd_seq_client *cptr; 2174 int client, type, err = 0; 2175 size_t size; 2176 void *p; 2177 2178 if (get_user(client, &argp->client) || get_user(type, &argp->type)) 2179 return -EFAULT; 2180 if (cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO && 2181 caller->number != client) 2182 return -EPERM; 2183 if (type < 0 || type >= NUM_UMP_INFOS) 2184 return -EINVAL; 2185 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) 2186 size = sizeof(struct snd_ump_endpoint_info); 2187 else 2188 size = sizeof(struct snd_ump_block_info); 2189 cptr = snd_seq_client_use_ptr(client); 2190 if (!cptr) 2191 return -ENOENT; 2192 2193 mutex_lock(&cptr->ioctl_mutex); 2194 if (!cptr->midi_version) { 2195 err = -EBADFD; 2196 goto error; 2197 } 2198 2199 if (cmd == SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO) { 2200 if (!cptr->ump_info) 2201 p = NULL; 2202 else 2203 p = cptr->ump_info[type]; 2204 if (!p) { 2205 err = -ENODEV; 2206 goto error; 2207 } 2208 if (copy_to_user(argp->info, p, size)) { 2209 err = -EFAULT; 2210 goto error; 2211 } 2212 } else { 2213 if (cptr->type != USER_CLIENT) { 2214 err = -EBADFD; 2215 goto error; 2216 } 2217 if (!cptr->ump_info) { 2218 cptr->ump_info = kcalloc(NUM_UMP_INFOS, 2219 sizeof(void *), GFP_KERNEL); 2220 if (!cptr->ump_info) { 2221 err = -ENOMEM; 2222 goto error; 2223 } 2224 } 2225 p = memdup_user(argp->info, size); 2226 if (IS_ERR(p)) { 2227 err = PTR_ERR(p); 2228 goto error; 2229 } 2230 kfree(cptr->ump_info[type]); 2231 terminate_ump_info_strings(p, type); 2232 cptr->ump_info[type] = p; 2233 } 2234 2235 error: 2236 mutex_unlock(&cptr->ioctl_mutex); 2237 snd_seq_client_unlock(cptr); 2238 if (!err && cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO) { 2239 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) 2240 snd_seq_system_ump_notify(client, 0, 2241 SNDRV_SEQ_EVENT_UMP_EP_CHANGE, 2242 false); 2243 else 2244 snd_seq_system_ump_notify(client, type - 1, 2245 SNDRV_SEQ_EVENT_UMP_BLOCK_CHANGE, 2246 false); 2247 } 2248 return err; 2249 } 2250 #endif 2251 2252 /* -------------------------------------------------------- */ 2253 2254 static const struct ioctl_handler { 2255 unsigned int cmd; 2256 int (*func)(struct snd_seq_client *client, void *arg); 2257 } ioctl_handlers[] = { 2258 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion }, 2259 { SNDRV_SEQ_IOCTL_USER_PVERSION, snd_seq_ioctl_user_pversion }, 2260 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id }, 2261 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2262 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2263 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2264 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2265 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2266 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2267 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2268 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2269 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2270 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2271 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2272 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2273 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2274 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2275 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2276 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2277 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2278 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2279 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2280 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2281 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2282 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2283 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2284 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2285 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2286 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2287 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2288 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2289 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2290 { 0, NULL }, 2291 }; 2292 2293 static long snd_seq_ioctl(struct file *file, unsigned int cmd, 2294 unsigned long arg) 2295 { 2296 struct snd_seq_client *client = file->private_data; 2297 /* To use kernel stack for ioctl data. */ 2298 union { 2299 int pversion; 2300 int client_id; 2301 struct snd_seq_system_info system_info; 2302 struct snd_seq_running_info running_info; 2303 struct snd_seq_client_info client_info; 2304 struct snd_seq_port_info port_info; 2305 struct snd_seq_port_subscribe port_subscribe; 2306 struct snd_seq_queue_info queue_info; 2307 struct snd_seq_queue_status queue_status; 2308 struct snd_seq_queue_tempo tempo; 2309 struct snd_seq_queue_timer queue_timer; 2310 struct snd_seq_queue_client queue_client; 2311 struct snd_seq_client_pool client_pool; 2312 struct snd_seq_remove_events remove_events; 2313 struct snd_seq_query_subs query_subs; 2314 } buf; 2315 const struct ioctl_handler *handler; 2316 unsigned long size; 2317 int err; 2318 2319 if (snd_BUG_ON(!client)) 2320 return -ENXIO; 2321 2322 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2323 /* exception - handling large data */ 2324 switch (cmd) { 2325 case SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO: 2326 case SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO: 2327 return snd_seq_ioctl_client_ump_info(client, cmd, arg); 2328 } 2329 #endif 2330 2331 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2332 if (handler->cmd == cmd) 2333 break; 2334 } 2335 if (handler->cmd == 0) 2336 return -ENOTTY; 2337 2338 memset(&buf, 0, sizeof(buf)); 2339 2340 /* 2341 * All of ioctl commands for ALSA sequencer get an argument of size 2342 * within 13 bits. We can safely pick up the size from the command. 2343 */ 2344 size = _IOC_SIZE(handler->cmd); 2345 if (handler->cmd & IOC_IN) { 2346 if (copy_from_user(&buf, (const void __user *)arg, size)) 2347 return -EFAULT; 2348 } 2349 2350 mutex_lock(&client->ioctl_mutex); 2351 err = handler->func(client, &buf); 2352 mutex_unlock(&client->ioctl_mutex); 2353 if (err >= 0) { 2354 /* Some commands includes a bug in 'dir' field. */ 2355 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT || 2356 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL || 2357 (handler->cmd & IOC_OUT)) 2358 if (copy_to_user((void __user *)arg, &buf, size)) 2359 return -EFAULT; 2360 } 2361 2362 return err; 2363 } 2364 2365 #ifdef CONFIG_COMPAT 2366 #include "seq_compat.c" 2367 #else 2368 #define snd_seq_ioctl_compat NULL 2369 #endif 2370 2371 /* -------------------------------------------------------- */ 2372 2373 2374 /* exported to kernel modules */ 2375 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2376 const char *name_fmt, ...) 2377 { 2378 struct snd_seq_client *client; 2379 va_list args; 2380 2381 if (snd_BUG_ON(in_interrupt())) 2382 return -EBUSY; 2383 2384 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2385 return -EINVAL; 2386 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2387 return -EINVAL; 2388 2389 mutex_lock(®ister_mutex); 2390 2391 if (card) { 2392 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2393 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2394 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2395 client_index = -1; 2396 } 2397 2398 /* empty write queue as default */ 2399 client = seq_create_client1(client_index, 0); 2400 if (client == NULL) { 2401 mutex_unlock(®ister_mutex); 2402 return -EBUSY; /* failure code */ 2403 } 2404 usage_alloc(&client_usage, 1); 2405 2406 client->accept_input = 1; 2407 client->accept_output = 1; 2408 client->data.kernel.card = card; 2409 client->user_pversion = SNDRV_SEQ_VERSION; 2410 2411 va_start(args, name_fmt); 2412 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2413 va_end(args); 2414 2415 client->type = KERNEL_CLIENT; 2416 mutex_unlock(®ister_mutex); 2417 2418 /* make others aware this new client */ 2419 snd_seq_system_client_ev_client_start(client->number); 2420 2421 /* return client number to caller */ 2422 return client->number; 2423 } 2424 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2425 2426 /* exported to kernel modules */ 2427 int snd_seq_delete_kernel_client(int client) 2428 { 2429 struct snd_seq_client *ptr; 2430 2431 if (snd_BUG_ON(in_interrupt())) 2432 return -EBUSY; 2433 2434 ptr = clientptr(client); 2435 if (ptr == NULL) 2436 return -EINVAL; 2437 2438 seq_free_client(ptr); 2439 kfree(ptr); 2440 return 0; 2441 } 2442 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2443 2444 /* 2445 * exported, called by kernel clients to enqueue events (w/o blocking) 2446 * 2447 * RETURN VALUE: zero if succeed, negative if error 2448 */ 2449 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, 2450 struct file *file, bool blocking) 2451 { 2452 struct snd_seq_client *cptr; 2453 int result; 2454 2455 if (snd_BUG_ON(!ev)) 2456 return -EINVAL; 2457 2458 if (!snd_seq_ev_is_ump(ev)) { 2459 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2460 return 0; /* ignore this */ 2461 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2462 return -EINVAL; /* quoted events can't be enqueued */ 2463 } 2464 2465 /* fill in client number */ 2466 ev->source.client = client; 2467 2468 if (check_event_type_and_length(ev)) 2469 return -EINVAL; 2470 2471 cptr = snd_seq_client_use_ptr(client); 2472 if (cptr == NULL) 2473 return -EINVAL; 2474 2475 if (!cptr->accept_output) { 2476 result = -EPERM; 2477 } else { /* send it */ 2478 mutex_lock(&cptr->ioctl_mutex); 2479 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, 2480 false, 0, 2481 &cptr->ioctl_mutex); 2482 mutex_unlock(&cptr->ioctl_mutex); 2483 } 2484 2485 snd_seq_client_unlock(cptr); 2486 return result; 2487 } 2488 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2489 2490 /* 2491 * exported, called by kernel clients to dispatch events directly to other 2492 * clients, bypassing the queues. Event time-stamp will be updated. 2493 * 2494 * RETURN VALUE: negative = delivery failed, 2495 * zero, or positive: the number of delivered events 2496 */ 2497 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2498 int atomic, int hop) 2499 { 2500 struct snd_seq_client *cptr; 2501 int result; 2502 2503 if (snd_BUG_ON(!ev)) 2504 return -EINVAL; 2505 2506 /* fill in client number */ 2507 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2508 ev->source.client = client; 2509 2510 if (check_event_type_and_length(ev)) 2511 return -EINVAL; 2512 2513 cptr = snd_seq_client_use_ptr(client); 2514 if (cptr == NULL) 2515 return -EINVAL; 2516 2517 if (!cptr->accept_output) 2518 result = -EPERM; 2519 else 2520 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2521 2522 snd_seq_client_unlock(cptr); 2523 return result; 2524 } 2525 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2526 2527 /** 2528 * snd_seq_kernel_client_ctl - operate a command for a client with data in 2529 * kernel space. 2530 * @clientid: A numerical ID for a client. 2531 * @cmd: An ioctl(2) command for ALSA sequencer operation. 2532 * @arg: A pointer to data in kernel space. 2533 * 2534 * Against its name, both kernel/application client can be handled by this 2535 * kernel API. A pointer of 'arg' argument should be in kernel space. 2536 * 2537 * Return: 0 at success. Negative error code at failure. 2538 */ 2539 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2540 { 2541 const struct ioctl_handler *handler; 2542 struct snd_seq_client *client; 2543 2544 client = clientptr(clientid); 2545 if (client == NULL) 2546 return -ENXIO; 2547 2548 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2549 if (handler->cmd == cmd) 2550 return handler->func(client, arg); 2551 } 2552 2553 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2554 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2555 return -ENOTTY; 2556 } 2557 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2558 2559 /* exported (for OSS emulator) */ 2560 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2561 { 2562 struct snd_seq_client *client; 2563 2564 client = clientptr(clientid); 2565 if (client == NULL) 2566 return -ENXIO; 2567 2568 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2569 return 1; 2570 return 0; 2571 } 2572 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2573 2574 /* get a sequencer client object; for internal use from a kernel client */ 2575 struct snd_seq_client *snd_seq_kernel_client_get(int id) 2576 { 2577 return snd_seq_client_use_ptr(id); 2578 } 2579 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_get); 2580 2581 /* put a sequencer client object; for internal use from a kernel client */ 2582 void snd_seq_kernel_client_put(struct snd_seq_client *cptr) 2583 { 2584 if (cptr) 2585 snd_seq_client_unlock(cptr); 2586 } 2587 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_put); 2588 2589 /*---------------------------------------------------------------------------*/ 2590 2591 #ifdef CONFIG_SND_PROC_FS 2592 /* 2593 * /proc interface 2594 */ 2595 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2596 struct snd_seq_port_subs_info *group, 2597 int is_src, char *msg) 2598 { 2599 struct list_head *p; 2600 struct snd_seq_subscribers *s; 2601 int count = 0; 2602 2603 down_read(&group->list_mutex); 2604 if (list_empty(&group->list_head)) { 2605 up_read(&group->list_mutex); 2606 return; 2607 } 2608 snd_iprintf(buffer, msg); 2609 list_for_each(p, &group->list_head) { 2610 if (is_src) 2611 s = list_entry(p, struct snd_seq_subscribers, src_list); 2612 else 2613 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2614 if (count++) 2615 snd_iprintf(buffer, ", "); 2616 snd_iprintf(buffer, "%d:%d", 2617 is_src ? s->info.dest.client : s->info.sender.client, 2618 is_src ? s->info.dest.port : s->info.sender.port); 2619 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2620 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2621 if (group->exclusive) 2622 snd_iprintf(buffer, "[ex]"); 2623 } 2624 up_read(&group->list_mutex); 2625 snd_iprintf(buffer, "\n"); 2626 } 2627 2628 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2629 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2630 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2631 2632 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2633 2634 static const char *port_direction_name(unsigned char dir) 2635 { 2636 static const char *names[4] = { 2637 "-", "In", "Out", "In/Out" 2638 }; 2639 2640 if (dir > SNDRV_SEQ_PORT_DIR_BIDIRECTION) 2641 return "Invalid"; 2642 return names[dir]; 2643 } 2644 2645 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2646 struct snd_seq_client *client) 2647 { 2648 struct snd_seq_client_port *p; 2649 2650 mutex_lock(&client->ports_mutex); 2651 list_for_each_entry(p, &client->ports_list_head, list) { 2652 if (p->capability & SNDRV_SEQ_PORT_CAP_INACTIVE) 2653 continue; 2654 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c) [%s]", 2655 p->addr.port, p->name, 2656 FLAG_PERM_RD(p->capability), 2657 FLAG_PERM_WR(p->capability), 2658 FLAG_PERM_EX(p->capability), 2659 FLAG_PERM_DUPLEX(p->capability), 2660 port_direction_name(p->direction)); 2661 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2662 if (snd_seq_client_is_midi2(client) && p->is_midi1) 2663 snd_iprintf(buffer, " [MIDI1]"); 2664 #endif 2665 snd_iprintf(buffer, "\n"); 2666 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2667 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2668 } 2669 mutex_unlock(&client->ports_mutex); 2670 } 2671 2672 static const char *midi_version_string(unsigned int version) 2673 { 2674 switch (version) { 2675 case SNDRV_SEQ_CLIENT_LEGACY_MIDI: 2676 return "Legacy"; 2677 case SNDRV_SEQ_CLIENT_UMP_MIDI_1_0: 2678 return "UMP MIDI1"; 2679 case SNDRV_SEQ_CLIENT_UMP_MIDI_2_0: 2680 return "UMP MIDI2"; 2681 default: 2682 return "Unknown"; 2683 } 2684 } 2685 2686 /* exported to seq_info.c */ 2687 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2688 struct snd_info_buffer *buffer) 2689 { 2690 int c; 2691 struct snd_seq_client *client; 2692 2693 snd_iprintf(buffer, "Client info\n"); 2694 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2695 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2696 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2697 snd_iprintf(buffer, "\n"); 2698 2699 /* list the client table */ 2700 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2701 client = snd_seq_client_use_ptr(c); 2702 if (client == NULL) 2703 continue; 2704 if (client->type == NO_CLIENT) { 2705 snd_seq_client_unlock(client); 2706 continue; 2707 } 2708 2709 mutex_lock(&client->ioctl_mutex); 2710 snd_iprintf(buffer, "Client %3d : \"%s\" [%s %s]\n", 2711 c, client->name, 2712 client->type == USER_CLIENT ? "User" : "Kernel", 2713 midi_version_string(client->midi_version)); 2714 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2715 dump_ump_info(buffer, client); 2716 #endif 2717 snd_seq_info_dump_ports(buffer, client); 2718 if (snd_seq_write_pool_allocated(client)) { 2719 snd_iprintf(buffer, " Output pool :\n"); 2720 snd_seq_info_pool(buffer, client->pool, " "); 2721 } 2722 if (client->type == USER_CLIENT && client->data.user.fifo && 2723 client->data.user.fifo->pool) { 2724 snd_iprintf(buffer, " Input pool :\n"); 2725 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2726 } 2727 mutex_unlock(&client->ioctl_mutex); 2728 snd_seq_client_unlock(client); 2729 } 2730 } 2731 #endif /* CONFIG_SND_PROC_FS */ 2732 2733 /*---------------------------------------------------------------------------*/ 2734 2735 2736 /* 2737 * REGISTRATION PART 2738 */ 2739 2740 static const struct file_operations snd_seq_f_ops = 2741 { 2742 .owner = THIS_MODULE, 2743 .read = snd_seq_read, 2744 .write = snd_seq_write, 2745 .open = snd_seq_open, 2746 .release = snd_seq_release, 2747 .poll = snd_seq_poll, 2748 .unlocked_ioctl = snd_seq_ioctl, 2749 .compat_ioctl = snd_seq_ioctl_compat, 2750 }; 2751 2752 static struct device *seq_dev; 2753 2754 /* 2755 * register sequencer device 2756 */ 2757 int __init snd_sequencer_device_init(void) 2758 { 2759 int err; 2760 2761 err = snd_device_alloc(&seq_dev, NULL); 2762 if (err < 0) 2763 return err; 2764 dev_set_name(seq_dev, "seq"); 2765 2766 mutex_lock(®ister_mutex); 2767 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2768 &snd_seq_f_ops, NULL, seq_dev); 2769 mutex_unlock(®ister_mutex); 2770 if (err < 0) { 2771 put_device(seq_dev); 2772 return err; 2773 } 2774 2775 return 0; 2776 } 2777 2778 2779 2780 /* 2781 * unregister sequencer device 2782 */ 2783 void snd_sequencer_device_done(void) 2784 { 2785 snd_unregister_device(seq_dev); 2786 put_device(seq_dev); 2787 } 2788