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 static struct snd_seq_client *client_use_ptr(int clientid, bool load_module) 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 (load_module) { 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 /* get snd_seq_client object for the given id quickly */ 172 struct snd_seq_client *snd_seq_client_use_ptr(int clientid) 173 { 174 return client_use_ptr(clientid, false); 175 } 176 177 /* get snd_seq_client object for the given id; 178 * if not found, retry after loading the modules 179 */ 180 static struct snd_seq_client *client_load_and_use_ptr(int clientid) 181 { 182 return client_use_ptr(clientid, IS_ENABLED(CONFIG_MODULES)); 183 } 184 185 /* Take refcount and perform ioctl_mutex lock on the given client; 186 * used only for OSS sequencer 187 * Unlock via snd_seq_client_ioctl_unlock() below 188 */ 189 bool snd_seq_client_ioctl_lock(int clientid) 190 { 191 struct snd_seq_client *client; 192 193 client = client_load_and_use_ptr(clientid); 194 if (!client) 195 return false; 196 mutex_lock(&client->ioctl_mutex); 197 /* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */ 198 return true; 199 } 200 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock); 201 202 /* Unlock and unref the given client; for OSS sequencer use only */ 203 void snd_seq_client_ioctl_unlock(int clientid) 204 { 205 struct snd_seq_client *client; 206 207 client = snd_seq_client_use_ptr(clientid); 208 if (WARN_ON(!client)) 209 return; 210 mutex_unlock(&client->ioctl_mutex); 211 /* The doubly unrefs below are intentional; the first one releases the 212 * leftover from snd_seq_client_ioctl_lock() above, and the second one 213 * is for releasing snd_seq_client_use_ptr() in this function 214 */ 215 snd_seq_client_unlock(client); 216 snd_seq_client_unlock(client); 217 } 218 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock); 219 220 static void usage_alloc(struct snd_seq_usage *res, int num) 221 { 222 res->cur += num; 223 if (res->cur > res->peak) 224 res->peak = res->cur; 225 } 226 227 static void usage_free(struct snd_seq_usage *res, int num) 228 { 229 res->cur -= num; 230 } 231 232 /* initialise data structures */ 233 int __init client_init_data(void) 234 { 235 /* zap out the client table */ 236 memset(&clienttablock, 0, sizeof(clienttablock)); 237 memset(&clienttab, 0, sizeof(clienttab)); 238 return 0; 239 } 240 241 242 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) 243 { 244 int c; 245 struct snd_seq_client *client; 246 247 /* init client data */ 248 client = kzalloc(sizeof(*client), GFP_KERNEL); 249 if (client == NULL) 250 return NULL; 251 client->pool = snd_seq_pool_new(poolsize); 252 if (client->pool == NULL) { 253 kfree(client); 254 return NULL; 255 } 256 client->type = NO_CLIENT; 257 snd_use_lock_init(&client->use_lock); 258 rwlock_init(&client->ports_lock); 259 mutex_init(&client->ports_mutex); 260 INIT_LIST_HEAD(&client->ports_list_head); 261 mutex_init(&client->ioctl_mutex); 262 client->ump_endpoint_port = -1; 263 264 /* find free slot in the client table */ 265 spin_lock_irq(&clients_lock); 266 if (client_index < 0) { 267 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; 268 c < SNDRV_SEQ_MAX_CLIENTS; 269 c++) { 270 if (clienttab[c] || clienttablock[c]) 271 continue; 272 clienttab[client->number = c] = client; 273 spin_unlock_irq(&clients_lock); 274 return client; 275 } 276 } else { 277 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 278 clienttab[client->number = client_index] = client; 279 spin_unlock_irq(&clients_lock); 280 return client; 281 } 282 } 283 spin_unlock_irq(&clients_lock); 284 snd_seq_pool_delete(&client->pool); 285 kfree(client); 286 return NULL; /* no free slot found or busy, return failure code */ 287 } 288 289 290 static int seq_free_client1(struct snd_seq_client *client) 291 { 292 if (!client) 293 return 0; 294 spin_lock_irq(&clients_lock); 295 clienttablock[client->number] = 1; 296 clienttab[client->number] = NULL; 297 spin_unlock_irq(&clients_lock); 298 snd_seq_delete_all_ports(client); 299 snd_seq_queue_client_leave(client->number); 300 snd_use_lock_sync(&client->use_lock); 301 if (client->pool) 302 snd_seq_pool_delete(&client->pool); 303 spin_lock_irq(&clients_lock); 304 clienttablock[client->number] = 0; 305 spin_unlock_irq(&clients_lock); 306 return 0; 307 } 308 309 310 static void seq_free_client(struct snd_seq_client * client) 311 { 312 mutex_lock(®ister_mutex); 313 switch (client->type) { 314 case NO_CLIENT: 315 pr_warn("ALSA: seq: Trying to free unused client %d\n", 316 client->number); 317 break; 318 case USER_CLIENT: 319 case KERNEL_CLIENT: 320 seq_free_client1(client); 321 usage_free(&client_usage, 1); 322 break; 323 324 default: 325 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n", 326 client->number, client->type); 327 } 328 mutex_unlock(®ister_mutex); 329 330 snd_seq_system_client_ev_client_exit(client->number); 331 } 332 333 334 335 /* -------------------------------------------------------- */ 336 337 /* create a user client */ 338 static int snd_seq_open(struct inode *inode, struct file *file) 339 { 340 int c, mode; /* client id */ 341 struct snd_seq_client *client; 342 struct snd_seq_user_client *user; 343 int err; 344 345 err = stream_open(inode, file); 346 if (err < 0) 347 return err; 348 349 mutex_lock(®ister_mutex); 350 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 351 if (!client) { 352 mutex_unlock(®ister_mutex); 353 return -ENOMEM; /* failure code */ 354 } 355 356 mode = snd_seq_file_flags(file); 357 if (mode & SNDRV_SEQ_LFLG_INPUT) 358 client->accept_input = 1; 359 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 360 client->accept_output = 1; 361 362 user = &client->data.user; 363 user->fifo = NULL; 364 user->fifo_pool_size = 0; 365 366 if (mode & SNDRV_SEQ_LFLG_INPUT) { 367 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 368 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 369 if (user->fifo == NULL) { 370 seq_free_client1(client); 371 kfree(client); 372 mutex_unlock(®ister_mutex); 373 return -ENOMEM; 374 } 375 } 376 377 usage_alloc(&client_usage, 1); 378 client->type = USER_CLIENT; 379 mutex_unlock(®ister_mutex); 380 381 c = client->number; 382 file->private_data = client; 383 384 /* fill client data */ 385 user->file = file; 386 sprintf(client->name, "Client-%d", c); 387 client->data.user.owner = get_pid(task_pid(current)); 388 389 /* make others aware this new client */ 390 snd_seq_system_client_ev_client_start(c); 391 392 return 0; 393 } 394 395 /* delete a user client */ 396 static int snd_seq_release(struct inode *inode, struct file *file) 397 { 398 struct snd_seq_client *client = file->private_data; 399 400 if (client) { 401 seq_free_client(client); 402 if (client->data.user.fifo) 403 snd_seq_fifo_delete(&client->data.user.fifo); 404 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 405 free_ump_info(client); 406 #endif 407 put_pid(client->data.user.owner); 408 kfree(client); 409 } 410 411 return 0; 412 } 413 414 static bool event_is_compatible(const struct snd_seq_client *client, 415 const struct snd_seq_event *ev) 416 { 417 if (snd_seq_ev_is_ump(ev) && !client->midi_version) 418 return false; 419 if (snd_seq_ev_is_ump(ev) && snd_seq_ev_is_variable(ev)) 420 return false; 421 return true; 422 } 423 424 /* handle client read() */ 425 /* possible error values: 426 * -ENXIO invalid client or file open mode 427 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 428 * -EINVAL no enough user-space buffer to write the whole event 429 * -EFAULT seg. fault during copy to user space 430 */ 431 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, 432 loff_t *offset) 433 { 434 struct snd_seq_client *client = file->private_data; 435 struct snd_seq_fifo *fifo; 436 size_t aligned_size; 437 int err; 438 long result = 0; 439 struct snd_seq_event_cell *cell; 440 441 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 442 return -ENXIO; 443 444 if (!access_ok(buf, count)) 445 return -EFAULT; 446 447 /* check client structures are in place */ 448 if (snd_BUG_ON(!client)) 449 return -ENXIO; 450 451 if (!client->accept_input) 452 return -ENXIO; 453 fifo = client->data.user.fifo; 454 if (!fifo) 455 return -ENXIO; 456 457 if (atomic_read(&fifo->overflow) > 0) { 458 /* buffer overflow is detected */ 459 snd_seq_fifo_clear(fifo); 460 /* return error code */ 461 return -ENOSPC; 462 } 463 464 cell = NULL; 465 err = 0; 466 snd_seq_fifo_lock(fifo); 467 468 if (IS_ENABLED(CONFIG_SND_SEQ_UMP) && client->midi_version > 0) 469 aligned_size = sizeof(struct snd_seq_ump_event); 470 else 471 aligned_size = sizeof(struct snd_seq_event); 472 473 /* while data available in queue */ 474 while (count >= aligned_size) { 475 int nonblock; 476 477 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 478 err = snd_seq_fifo_cell_out(fifo, &cell, nonblock); 479 if (err < 0) 480 break; 481 if (!event_is_compatible(client, &cell->event)) { 482 snd_seq_cell_free(cell); 483 cell = NULL; 484 continue; 485 } 486 if (snd_seq_ev_is_variable(&cell->event)) { 487 struct snd_seq_ump_event tmpev; 488 489 memcpy(&tmpev, &cell->event, aligned_size); 490 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 491 if (copy_to_user(buf, &tmpev, aligned_size)) { 492 err = -EFAULT; 493 break; 494 } 495 count -= aligned_size; 496 buf += aligned_size; 497 err = snd_seq_expand_var_event(&cell->event, count, 498 (char __force *)buf, 0, 499 aligned_size); 500 if (err < 0) 501 break; 502 result += err; 503 count -= err; 504 buf += err; 505 } else { 506 if (copy_to_user(buf, &cell->event, aligned_size)) { 507 err = -EFAULT; 508 break; 509 } 510 count -= aligned_size; 511 buf += aligned_size; 512 } 513 snd_seq_cell_free(cell); 514 cell = NULL; /* to be sure */ 515 result += aligned_size; 516 } 517 518 if (err < 0) { 519 if (cell) 520 snd_seq_fifo_cell_putback(fifo, cell); 521 if (err == -EAGAIN && result > 0) 522 err = 0; 523 } 524 snd_seq_fifo_unlock(fifo); 525 526 return (err < 0) ? err : result; 527 } 528 529 530 /* 531 * check access permission to the port 532 */ 533 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 534 { 535 if ((port->capability & flags) != flags) 536 return 0; 537 return flags; 538 } 539 540 /* 541 * check if the destination client is available, and return the pointer 542 */ 543 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event) 544 { 545 struct snd_seq_client *dest; 546 547 dest = snd_seq_client_use_ptr(event->dest.client); 548 if (dest == NULL) 549 return NULL; 550 if (! dest->accept_input) 551 goto __not_avail; 552 if (snd_seq_ev_is_ump(event)) 553 return dest; /* ok - no filter checks */ 554 555 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 556 ! test_bit(event->type, dest->event_filter)) 557 goto __not_avail; 558 559 return dest; /* ok - accessible */ 560 __not_avail: 561 snd_seq_client_unlock(dest); 562 return NULL; 563 } 564 565 566 /* 567 * Return the error event. 568 * 569 * If the receiver client is a user client, the original event is 570 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 571 * the original event is also variable length, the external data is 572 * copied after the event record. 573 * If the receiver client is a kernel client, the original event is 574 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 575 * kmalloc. 576 */ 577 static int bounce_error_event(struct snd_seq_client *client, 578 struct snd_seq_event *event, 579 int err, int atomic, int hop) 580 { 581 struct snd_seq_event bounce_ev; 582 int result; 583 584 if (client == NULL || 585 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 586 ! client->accept_input) 587 return 0; /* ignored */ 588 589 /* set up quoted error */ 590 memset(&bounce_ev, 0, sizeof(bounce_ev)); 591 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 592 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 593 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 594 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 595 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 596 bounce_ev.dest.client = client->number; 597 bounce_ev.dest.port = event->source.port; 598 bounce_ev.data.quote.origin = event->dest; 599 bounce_ev.data.quote.event = event; 600 bounce_ev.data.quote.value = -err; /* use positive value */ 601 result = snd_seq_deliver_single_event(NULL, &bounce_ev, atomic, hop + 1); 602 if (result < 0) { 603 client->event_lost++; 604 return result; 605 } 606 607 return result; 608 } 609 610 611 /* 612 * rewrite the time-stamp of the event record with the curren time 613 * of the given queue. 614 * return non-zero if updated. 615 */ 616 static int update_timestamp_of_queue(struct snd_seq_event *event, 617 int queue, int real_time) 618 { 619 struct snd_seq_queue *q; 620 621 q = queueptr(queue); 622 if (! q) 623 return 0; 624 event->queue = queue; 625 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 626 if (real_time) { 627 event->time.time = snd_seq_timer_get_cur_time(q->timer, true); 628 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 629 } else { 630 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 631 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 632 } 633 queuefree(q); 634 return 1; 635 } 636 637 /* deliver a single event; called from below and UMP converter */ 638 int __snd_seq_deliver_single_event(struct snd_seq_client *dest, 639 struct snd_seq_client_port *dest_port, 640 struct snd_seq_event *event, 641 int atomic, int hop) 642 { 643 switch (dest->type) { 644 case USER_CLIENT: 645 if (!dest->data.user.fifo) 646 return 0; 647 return snd_seq_fifo_event_in(dest->data.user.fifo, event); 648 case KERNEL_CLIENT: 649 if (!dest_port->event_input) 650 return 0; 651 return dest_port->event_input(event, 652 snd_seq_ev_is_direct(event), 653 dest_port->private_data, 654 atomic, hop); 655 } 656 return 0; 657 } 658 659 /* 660 * deliver an event to the specified destination. 661 * if filter is non-zero, client filter bitmap is tested. 662 * 663 * RETURN VALUE: 0 : if succeeded 664 * <0 : error 665 */ 666 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 667 struct snd_seq_event *event, 668 int atomic, int hop) 669 { 670 struct snd_seq_client *dest = NULL; 671 struct snd_seq_client_port *dest_port = NULL; 672 int result = -ENOENT; 673 int direct; 674 675 direct = snd_seq_ev_is_direct(event); 676 677 dest = get_event_dest_client(event); 678 if (dest == NULL) 679 goto __skip; 680 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 681 if (dest_port == NULL) 682 goto __skip; 683 684 /* check permission */ 685 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 686 result = -EPERM; 687 goto __skip; 688 } 689 690 if (dest_port->timestamping) 691 update_timestamp_of_queue(event, dest_port->time_queue, 692 dest_port->time_real); 693 694 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 695 if (snd_seq_ev_is_ump(event)) { 696 if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT)) { 697 result = snd_seq_deliver_from_ump(client, dest, dest_port, 698 event, atomic, hop); 699 goto __skip; 700 } else if (dest->type == USER_CLIENT && 701 !snd_seq_client_is_ump(dest)) { 702 result = 0; // drop the event 703 goto __skip; 704 } 705 } else if (snd_seq_client_is_ump(dest)) { 706 if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT)) { 707 result = snd_seq_deliver_to_ump(client, dest, dest_port, 708 event, atomic, hop); 709 goto __skip; 710 } 711 } 712 #endif /* CONFIG_SND_SEQ_UMP */ 713 714 result = __snd_seq_deliver_single_event(dest, dest_port, event, 715 atomic, hop); 716 717 __skip: 718 if (dest_port) 719 snd_seq_port_unlock(dest_port); 720 if (dest) 721 snd_seq_client_unlock(dest); 722 723 if (result < 0 && !direct) { 724 result = bounce_error_event(client, event, result, atomic, hop); 725 } 726 return result; 727 } 728 729 730 /* 731 * send the event to all subscribers: 732 */ 733 static int __deliver_to_subscribers(struct snd_seq_client *client, 734 struct snd_seq_event *event, 735 struct snd_seq_client_port *src_port, 736 int atomic, int hop) 737 { 738 struct snd_seq_subscribers *subs; 739 int err, result = 0, num_ev = 0; 740 union __snd_seq_event event_saved; 741 size_t saved_size; 742 struct snd_seq_port_subs_info *grp; 743 744 /* save original event record */ 745 saved_size = snd_seq_event_packet_size(event); 746 memcpy(&event_saved, event, saved_size); 747 grp = &src_port->c_src; 748 749 /* lock list */ 750 if (atomic) 751 read_lock(&grp->list_lock); 752 else 753 down_read_nested(&grp->list_mutex, hop); 754 list_for_each_entry(subs, &grp->list_head, src_list) { 755 /* both ports ready? */ 756 if (atomic_read(&subs->ref_count) != 2) 757 continue; 758 event->dest = subs->info.dest; 759 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 760 /* convert time according to flag with subscription */ 761 update_timestamp_of_queue(event, subs->info.queue, 762 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 763 err = snd_seq_deliver_single_event(client, event, atomic, hop); 764 if (err < 0) { 765 /* save first error that occurs and continue */ 766 if (!result) 767 result = err; 768 continue; 769 } 770 num_ev++; 771 /* restore original event record */ 772 memcpy(event, &event_saved, saved_size); 773 } 774 if (atomic) 775 read_unlock(&grp->list_lock); 776 else 777 up_read(&grp->list_mutex); 778 memcpy(event, &event_saved, saved_size); 779 return (result < 0) ? result : num_ev; 780 } 781 782 static int deliver_to_subscribers(struct snd_seq_client *client, 783 struct snd_seq_event *event, 784 int atomic, int hop) 785 { 786 struct snd_seq_client_port *src_port; 787 int ret = 0, ret2; 788 789 src_port = snd_seq_port_use_ptr(client, event->source.port); 790 if (src_port) { 791 ret = __deliver_to_subscribers(client, event, src_port, atomic, hop); 792 snd_seq_port_unlock(src_port); 793 } 794 795 if (client->ump_endpoint_port < 0 || 796 event->source.port == client->ump_endpoint_port) 797 return ret; 798 799 src_port = snd_seq_port_use_ptr(client, client->ump_endpoint_port); 800 if (!src_port) 801 return ret; 802 ret2 = __deliver_to_subscribers(client, event, src_port, atomic, hop); 803 snd_seq_port_unlock(src_port); 804 return ret2 < 0 ? ret2 : ret; 805 } 806 807 /* deliver an event to the destination port(s). 808 * if the event is to subscribers or broadcast, the event is dispatched 809 * to multiple targets. 810 * 811 * RETURN VALUE: n > 0 : the number of delivered events. 812 * n == 0 : the event was not passed to any client. 813 * n < 0 : error - event was not processed. 814 */ 815 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 816 int atomic, int hop) 817 { 818 int result; 819 820 hop++; 821 if (hop >= SNDRV_SEQ_MAX_HOPS) { 822 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 823 event->source.client, event->source.port, 824 event->dest.client, event->dest.port); 825 return -EMLINK; 826 } 827 828 if (snd_seq_ev_is_variable(event) && 829 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR))) 830 return -EINVAL; 831 832 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 833 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 834 result = deliver_to_subscribers(client, event, atomic, hop); 835 else 836 result = snd_seq_deliver_single_event(client, event, atomic, hop); 837 838 return result; 839 } 840 841 /* 842 * dispatch an event cell: 843 * This function is called only from queue check routines in timer 844 * interrupts or after enqueued. 845 * The event cell shall be released or re-queued in this function. 846 * 847 * RETURN VALUE: n > 0 : the number of delivered events. 848 * n == 0 : the event was not passed to any client. 849 * n < 0 : error - event was not processed. 850 */ 851 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 852 { 853 struct snd_seq_client *client; 854 int result; 855 856 if (snd_BUG_ON(!cell)) 857 return -EINVAL; 858 859 client = snd_seq_client_use_ptr(cell->event.source.client); 860 if (client == NULL) { 861 snd_seq_cell_free(cell); /* release this cell */ 862 return -EINVAL; 863 } 864 865 if (!snd_seq_ev_is_ump(&cell->event) && 866 cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 867 /* NOTE event: 868 * the event cell is re-used as a NOTE-OFF event and 869 * enqueued again. 870 */ 871 struct snd_seq_event tmpev, *ev; 872 873 /* reserve this event to enqueue note-off later */ 874 tmpev = cell->event; 875 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 876 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 877 878 /* 879 * This was originally a note event. We now re-use the 880 * cell for the note-off event. 881 */ 882 883 ev = &cell->event; 884 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 885 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 886 887 /* add the duration time */ 888 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 889 case SNDRV_SEQ_TIME_STAMP_TICK: 890 cell->event.time.tick += ev->data.note.duration; 891 break; 892 case SNDRV_SEQ_TIME_STAMP_REAL: 893 /* unit for duration is ms */ 894 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 895 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 896 ev->time.time.tv_nsec / 1000000000; 897 ev->time.time.tv_nsec %= 1000000000; 898 break; 899 } 900 ev->data.note.velocity = ev->data.note.off_velocity; 901 902 /* Now queue this cell as the note off event */ 903 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 904 snd_seq_cell_free(cell); /* release this cell */ 905 906 } else { 907 /* Normal events: 908 * event cell is freed after processing the event 909 */ 910 911 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 912 snd_seq_cell_free(cell); 913 } 914 915 snd_seq_client_unlock(client); 916 return result; 917 } 918 919 920 /* Allocate a cell from client pool and enqueue it to queue: 921 * if pool is empty and blocking is TRUE, sleep until a new cell is 922 * available. 923 */ 924 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 925 struct snd_seq_event *event, 926 struct file *file, int blocking, 927 int atomic, int hop, 928 struct mutex *mutexp) 929 { 930 struct snd_seq_event_cell *cell; 931 int err; 932 933 /* special queue values - force direct passing */ 934 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 935 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 936 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 937 } else if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 938 /* check presence of source port */ 939 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 940 if (src_port == NULL) 941 return -EINVAL; 942 snd_seq_port_unlock(src_port); 943 } 944 945 /* direct event processing without enqueued */ 946 if (snd_seq_ev_is_direct(event)) { 947 if (!snd_seq_ev_is_ump(event) && 948 event->type == SNDRV_SEQ_EVENT_NOTE) 949 return -EINVAL; /* this event must be enqueued! */ 950 return snd_seq_deliver_event(client, event, atomic, hop); 951 } 952 953 /* Not direct, normal queuing */ 954 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 955 return -EINVAL; /* invalid queue */ 956 if (! snd_seq_write_pool_allocated(client)) 957 return -ENXIO; /* queue is not allocated */ 958 959 /* allocate an event cell */ 960 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, 961 file, mutexp); 962 if (err < 0) 963 return err; 964 965 /* we got a cell. enqueue it. */ 966 err = snd_seq_enqueue_event(cell, atomic, hop); 967 if (err < 0) { 968 snd_seq_cell_free(cell); 969 return err; 970 } 971 972 return 0; 973 } 974 975 976 /* 977 * check validity of event type and data length. 978 * return non-zero if invalid. 979 */ 980 static int check_event_type_and_length(struct snd_seq_event *ev) 981 { 982 switch (snd_seq_ev_length_type(ev)) { 983 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 984 if (snd_seq_ev_is_variable_type(ev)) 985 return -EINVAL; 986 break; 987 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 988 if (! snd_seq_ev_is_variable_type(ev) || 989 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 990 return -EINVAL; 991 break; 992 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 993 if (! snd_seq_ev_is_direct(ev)) 994 return -EINVAL; 995 break; 996 } 997 return 0; 998 } 999 1000 1001 /* handle write() */ 1002 /* possible error values: 1003 * -ENXIO invalid client or file open mode 1004 * -ENOMEM malloc failed 1005 * -EFAULT seg. fault during copy from user space 1006 * -EINVAL invalid event 1007 * -EAGAIN no space in output pool 1008 * -EINTR interrupts while sleep 1009 * -EMLINK too many hops 1010 * others depends on return value from driver callback 1011 */ 1012 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 1013 size_t count, loff_t *offset) 1014 { 1015 struct snd_seq_client *client = file->private_data; 1016 int written = 0, len; 1017 int err, handled; 1018 union __snd_seq_event __event; 1019 struct snd_seq_event *ev = &__event.legacy; 1020 1021 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1022 return -ENXIO; 1023 1024 /* check client structures are in place */ 1025 if (snd_BUG_ON(!client)) 1026 return -ENXIO; 1027 1028 if (!client->accept_output || client->pool == NULL) 1029 return -ENXIO; 1030 1031 repeat: 1032 handled = 0; 1033 /* allocate the pool now if the pool is not allocated yet */ 1034 mutex_lock(&client->ioctl_mutex); 1035 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1036 err = snd_seq_pool_init(client->pool); 1037 if (err < 0) 1038 goto out; 1039 } 1040 1041 /* only process whole events */ 1042 err = -EINVAL; 1043 while (count >= sizeof(struct snd_seq_event)) { 1044 /* Read in the event header from the user */ 1045 len = sizeof(struct snd_seq_event); 1046 if (copy_from_user(ev, buf, len)) { 1047 err = -EFAULT; 1048 break; 1049 } 1050 /* read in the rest bytes for UMP events */ 1051 if (snd_seq_ev_is_ump(ev)) { 1052 if (count < sizeof(struct snd_seq_ump_event)) 1053 break; 1054 if (copy_from_user((char *)ev + len, buf + len, 1055 sizeof(struct snd_seq_ump_event) - len)) { 1056 err = -EFAULT; 1057 break; 1058 } 1059 len = sizeof(struct snd_seq_ump_event); 1060 } 1061 1062 ev->source.client = client->number; /* fill in client number */ 1063 /* Check for extension data length */ 1064 if (check_event_type_and_length(ev)) { 1065 err = -EINVAL; 1066 break; 1067 } 1068 1069 if (!event_is_compatible(client, ev)) { 1070 err = -EINVAL; 1071 break; 1072 } 1073 1074 /* check for special events */ 1075 if (!snd_seq_ev_is_ump(ev)) { 1076 if (ev->type == SNDRV_SEQ_EVENT_NONE) 1077 goto __skip_event; 1078 else if (snd_seq_ev_is_reserved(ev)) { 1079 err = -EINVAL; 1080 break; 1081 } 1082 } 1083 1084 if (snd_seq_ev_is_variable(ev)) { 1085 int extlen = ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1086 if ((size_t)(extlen + len) > count) { 1087 /* back out, will get an error this time or next */ 1088 err = -EINVAL; 1089 break; 1090 } 1091 /* set user space pointer */ 1092 ev->data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1093 ev->data.ext.ptr = (char __force *)buf + len; 1094 len += extlen; /* increment data length */ 1095 } else { 1096 #ifdef CONFIG_COMPAT 1097 if (client->convert32 && snd_seq_ev_is_varusr(ev)) 1098 ev->data.ext.ptr = 1099 (void __force *)compat_ptr(ev->data.raw32.d[1]); 1100 #endif 1101 } 1102 1103 /* ok, enqueue it */ 1104 err = snd_seq_client_enqueue_event(client, ev, file, 1105 !(file->f_flags & O_NONBLOCK), 1106 0, 0, &client->ioctl_mutex); 1107 if (err < 0) 1108 break; 1109 handled++; 1110 1111 __skip_event: 1112 /* Update pointers and counts */ 1113 count -= len; 1114 buf += len; 1115 written += len; 1116 1117 /* let's have a coffee break if too many events are queued */ 1118 if (++handled >= 200) { 1119 mutex_unlock(&client->ioctl_mutex); 1120 goto repeat; 1121 } 1122 } 1123 1124 out: 1125 mutex_unlock(&client->ioctl_mutex); 1126 return written ? written : err; 1127 } 1128 1129 1130 /* 1131 * handle polling 1132 */ 1133 static __poll_t snd_seq_poll(struct file *file, poll_table * wait) 1134 { 1135 struct snd_seq_client *client = file->private_data; 1136 __poll_t mask = 0; 1137 1138 /* check client structures are in place */ 1139 if (snd_BUG_ON(!client)) 1140 return EPOLLERR; 1141 1142 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1143 client->data.user.fifo) { 1144 1145 /* check if data is available in the outqueue */ 1146 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1147 mask |= EPOLLIN | EPOLLRDNORM; 1148 } 1149 1150 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1151 1152 /* check if data is available in the pool */ 1153 if (!snd_seq_write_pool_allocated(client) || 1154 snd_seq_pool_poll_wait(client->pool, file, wait)) 1155 mask |= EPOLLOUT | EPOLLWRNORM; 1156 } 1157 1158 return mask; 1159 } 1160 1161 1162 /*-----------------------------------------------------*/ 1163 1164 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg) 1165 { 1166 int *pversion = arg; 1167 1168 *pversion = SNDRV_SEQ_VERSION; 1169 return 0; 1170 } 1171 1172 static int snd_seq_ioctl_user_pversion(struct snd_seq_client *client, void *arg) 1173 { 1174 client->user_pversion = *(unsigned int *)arg; 1175 return 0; 1176 } 1177 1178 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg) 1179 { 1180 int *client_id = arg; 1181 1182 *client_id = client->number; 1183 return 0; 1184 } 1185 1186 /* SYSTEM_INFO ioctl() */ 1187 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg) 1188 { 1189 struct snd_seq_system_info *info = arg; 1190 1191 memset(info, 0, sizeof(*info)); 1192 /* fill the info fields */ 1193 info->queues = SNDRV_SEQ_MAX_QUEUES; 1194 info->clients = SNDRV_SEQ_MAX_CLIENTS; 1195 info->ports = SNDRV_SEQ_MAX_PORTS; 1196 info->channels = 256; /* fixed limit */ 1197 info->cur_clients = client_usage.cur; 1198 info->cur_queues = snd_seq_queue_get_cur_queues(); 1199 1200 return 0; 1201 } 1202 1203 1204 /* RUNNING_MODE ioctl() */ 1205 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg) 1206 { 1207 struct snd_seq_running_info *info = arg; 1208 struct snd_seq_client *cptr; 1209 int err = 0; 1210 1211 /* requested client number */ 1212 cptr = client_load_and_use_ptr(info->client); 1213 if (cptr == NULL) 1214 return -ENOENT; /* don't change !!! */ 1215 1216 #ifdef SNDRV_BIG_ENDIAN 1217 if (!info->big_endian) { 1218 err = -EINVAL; 1219 goto __err; 1220 } 1221 #else 1222 if (info->big_endian) { 1223 err = -EINVAL; 1224 goto __err; 1225 } 1226 1227 #endif 1228 if (info->cpu_mode > sizeof(long)) { 1229 err = -EINVAL; 1230 goto __err; 1231 } 1232 cptr->convert32 = (info->cpu_mode < sizeof(long)); 1233 __err: 1234 snd_seq_client_unlock(cptr); 1235 return err; 1236 } 1237 1238 /* CLIENT_INFO ioctl() */ 1239 static void get_client_info(struct snd_seq_client *cptr, 1240 struct snd_seq_client_info *info) 1241 { 1242 info->client = cptr->number; 1243 1244 /* fill the info fields */ 1245 info->type = cptr->type; 1246 strcpy(info->name, cptr->name); 1247 info->filter = cptr->filter; 1248 info->event_lost = cptr->event_lost; 1249 memcpy(info->event_filter, cptr->event_filter, 32); 1250 info->group_filter = cptr->group_filter; 1251 info->num_ports = cptr->num_ports; 1252 1253 if (cptr->type == USER_CLIENT) 1254 info->pid = pid_vnr(cptr->data.user.owner); 1255 else 1256 info->pid = -1; 1257 1258 if (cptr->type == KERNEL_CLIENT) 1259 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; 1260 else 1261 info->card = -1; 1262 1263 info->midi_version = cptr->midi_version; 1264 memset(info->reserved, 0, sizeof(info->reserved)); 1265 } 1266 1267 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1268 void *arg) 1269 { 1270 struct snd_seq_client_info *client_info = arg; 1271 struct snd_seq_client *cptr; 1272 1273 /* requested client number */ 1274 cptr = client_load_and_use_ptr(client_info->client); 1275 if (cptr == NULL) 1276 return -ENOENT; /* don't change !!! */ 1277 1278 get_client_info(cptr, client_info); 1279 snd_seq_client_unlock(cptr); 1280 1281 return 0; 1282 } 1283 1284 1285 /* CLIENT_INFO ioctl() */ 1286 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1287 void *arg) 1288 { 1289 struct snd_seq_client_info *client_info = arg; 1290 1291 /* it is not allowed to set the info fields for an another client */ 1292 if (client->number != client_info->client) 1293 return -EPERM; 1294 /* also client type must be set now */ 1295 if (client->type != client_info->type) 1296 return -EINVAL; 1297 1298 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) { 1299 /* check validity of midi_version field */ 1300 if (client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0) 1301 return -EINVAL; 1302 1303 /* check if UMP is supported in kernel */ 1304 if (!IS_ENABLED(CONFIG_SND_SEQ_UMP) && 1305 client_info->midi_version > 0) 1306 return -EINVAL; 1307 } 1308 1309 /* fill the info fields */ 1310 if (client_info->name[0]) 1311 strscpy(client->name, client_info->name, sizeof(client->name)); 1312 1313 client->filter = client_info->filter; 1314 client->event_lost = client_info->event_lost; 1315 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) 1316 client->midi_version = client_info->midi_version; 1317 memcpy(client->event_filter, client_info->event_filter, 32); 1318 client->group_filter = client_info->group_filter; 1319 1320 /* notify the change */ 1321 snd_seq_system_client_ev_client_change(client->number); 1322 1323 return 0; 1324 } 1325 1326 1327 /* 1328 * CREATE PORT ioctl() 1329 */ 1330 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg) 1331 { 1332 struct snd_seq_port_info *info = arg; 1333 struct snd_seq_client_port *port; 1334 struct snd_seq_port_callback *callback; 1335 int port_idx, err; 1336 1337 /* it is not allowed to create the port for an another client */ 1338 if (info->addr.client != client->number) 1339 return -EPERM; 1340 if (client->type == USER_CLIENT && info->kernel) 1341 return -EINVAL; 1342 if ((info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) && 1343 client->ump_endpoint_port >= 0) 1344 return -EBUSY; 1345 1346 if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) 1347 port_idx = info->addr.port; 1348 else 1349 port_idx = -1; 1350 if (port_idx >= SNDRV_SEQ_ADDRESS_UNKNOWN) 1351 return -EINVAL; 1352 err = snd_seq_create_port(client, port_idx, &port); 1353 if (err < 0) 1354 return err; 1355 1356 if (client->type == KERNEL_CLIENT) { 1357 callback = info->kernel; 1358 if (callback) { 1359 if (callback->owner) 1360 port->owner = callback->owner; 1361 port->private_data = callback->private_data; 1362 port->private_free = callback->private_free; 1363 port->event_input = callback->event_input; 1364 port->c_src.open = callback->subscribe; 1365 port->c_src.close = callback->unsubscribe; 1366 port->c_dest.open = callback->use; 1367 port->c_dest.close = callback->unuse; 1368 } 1369 } 1370 1371 info->addr = port->addr; 1372 1373 snd_seq_set_port_info(port, info); 1374 if (info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) 1375 client->ump_endpoint_port = port->addr.port; 1376 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1377 snd_seq_port_unlock(port); 1378 1379 return 0; 1380 } 1381 1382 /* 1383 * DELETE PORT ioctl() 1384 */ 1385 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg) 1386 { 1387 struct snd_seq_port_info *info = arg; 1388 int err; 1389 1390 /* it is not allowed to remove the port for an another client */ 1391 if (info->addr.client != client->number) 1392 return -EPERM; 1393 1394 err = snd_seq_delete_port(client, info->addr.port); 1395 if (err >= 0) { 1396 if (client->ump_endpoint_port == info->addr.port) 1397 client->ump_endpoint_port = -1; 1398 snd_seq_system_client_ev_port_exit(client->number, info->addr.port); 1399 } 1400 return err; 1401 } 1402 1403 1404 /* 1405 * GET_PORT_INFO ioctl() (on any client) 1406 */ 1407 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg) 1408 { 1409 struct snd_seq_port_info *info = arg; 1410 struct snd_seq_client *cptr; 1411 struct snd_seq_client_port *port; 1412 1413 cptr = client_load_and_use_ptr(info->addr.client); 1414 if (cptr == NULL) 1415 return -ENXIO; 1416 1417 port = snd_seq_port_use_ptr(cptr, info->addr.port); 1418 if (port == NULL) { 1419 snd_seq_client_unlock(cptr); 1420 return -ENOENT; /* don't change */ 1421 } 1422 1423 /* get port info */ 1424 snd_seq_get_port_info(port, info); 1425 snd_seq_port_unlock(port); 1426 snd_seq_client_unlock(cptr); 1427 1428 return 0; 1429 } 1430 1431 1432 /* 1433 * SET_PORT_INFO ioctl() (only ports on this/own client) 1434 */ 1435 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg) 1436 { 1437 struct snd_seq_port_info *info = arg; 1438 struct snd_seq_client_port *port; 1439 1440 if (info->addr.client != client->number) /* only set our own ports ! */ 1441 return -EPERM; 1442 port = snd_seq_port_use_ptr(client, info->addr.port); 1443 if (port) { 1444 snd_seq_set_port_info(port, info); 1445 snd_seq_port_unlock(port); 1446 /* notify the change */ 1447 snd_seq_system_client_ev_port_change(info->addr.client, 1448 info->addr.port); 1449 } 1450 return 0; 1451 } 1452 1453 1454 /* 1455 * port subscription (connection) 1456 */ 1457 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1458 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1459 1460 static int check_subscription_permission(struct snd_seq_client *client, 1461 struct snd_seq_client_port *sport, 1462 struct snd_seq_client_port *dport, 1463 struct snd_seq_port_subscribe *subs) 1464 { 1465 if (client->number != subs->sender.client && 1466 client->number != subs->dest.client) { 1467 /* connection by third client - check export permission */ 1468 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1469 return -EPERM; 1470 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1471 return -EPERM; 1472 } 1473 1474 /* check read permission */ 1475 /* if sender or receiver is the subscribing client itself, 1476 * no permission check is necessary 1477 */ 1478 if (client->number != subs->sender.client) { 1479 if (! check_port_perm(sport, PERM_RD)) 1480 return -EPERM; 1481 } 1482 /* check write permission */ 1483 if (client->number != subs->dest.client) { 1484 if (! check_port_perm(dport, PERM_WR)) 1485 return -EPERM; 1486 } 1487 return 0; 1488 } 1489 1490 /* 1491 * send an subscription notify event to user client: 1492 * client must be user client. 1493 */ 1494 int snd_seq_client_notify_subscription(int client, int port, 1495 struct snd_seq_port_subscribe *info, 1496 int evtype) 1497 { 1498 struct snd_seq_event event; 1499 1500 memset(&event, 0, sizeof(event)); 1501 event.type = evtype; 1502 event.data.connect.dest = info->dest; 1503 event.data.connect.sender = info->sender; 1504 1505 return snd_seq_system_notify(client, port, &event, false); /* non-atomic */ 1506 } 1507 1508 1509 /* 1510 * add to port's subscription list IOCTL interface 1511 */ 1512 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1513 void *arg) 1514 { 1515 struct snd_seq_port_subscribe *subs = arg; 1516 int result = -EINVAL; 1517 struct snd_seq_client *receiver = NULL, *sender = NULL; 1518 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1519 1520 receiver = client_load_and_use_ptr(subs->dest.client); 1521 if (!receiver) 1522 goto __end; 1523 sender = client_load_and_use_ptr(subs->sender.client); 1524 if (!sender) 1525 goto __end; 1526 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1527 if (!sport) 1528 goto __end; 1529 dport = snd_seq_port_use_ptr(receiver, subs->dest.port); 1530 if (!dport) 1531 goto __end; 1532 1533 result = check_subscription_permission(client, sport, dport, subs); 1534 if (result < 0) 1535 goto __end; 1536 1537 /* connect them */ 1538 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs); 1539 if (! result) /* broadcast announce */ 1540 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1541 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1542 __end: 1543 if (sport) 1544 snd_seq_port_unlock(sport); 1545 if (dport) 1546 snd_seq_port_unlock(dport); 1547 if (sender) 1548 snd_seq_client_unlock(sender); 1549 if (receiver) 1550 snd_seq_client_unlock(receiver); 1551 return result; 1552 } 1553 1554 1555 /* 1556 * remove from port's subscription list 1557 */ 1558 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1559 void *arg) 1560 { 1561 struct snd_seq_port_subscribe *subs = arg; 1562 int result = -ENXIO; 1563 struct snd_seq_client *receiver = NULL, *sender = NULL; 1564 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1565 1566 receiver = snd_seq_client_use_ptr(subs->dest.client); 1567 if (!receiver) 1568 goto __end; 1569 sender = snd_seq_client_use_ptr(subs->sender.client); 1570 if (!sender) 1571 goto __end; 1572 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1573 if (!sport) 1574 goto __end; 1575 dport = snd_seq_port_use_ptr(receiver, subs->dest.port); 1576 if (!dport) 1577 goto __end; 1578 1579 result = check_subscription_permission(client, sport, dport, subs); 1580 if (result < 0) 1581 goto __end; 1582 1583 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs); 1584 if (! result) /* broadcast announce */ 1585 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1586 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1587 __end: 1588 if (sport) 1589 snd_seq_port_unlock(sport); 1590 if (dport) 1591 snd_seq_port_unlock(dport); 1592 if (sender) 1593 snd_seq_client_unlock(sender); 1594 if (receiver) 1595 snd_seq_client_unlock(receiver); 1596 return result; 1597 } 1598 1599 1600 /* CREATE_QUEUE ioctl() */ 1601 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg) 1602 { 1603 struct snd_seq_queue_info *info = arg; 1604 struct snd_seq_queue *q; 1605 1606 q = snd_seq_queue_alloc(client->number, info->locked, info->flags); 1607 if (IS_ERR(q)) 1608 return PTR_ERR(q); 1609 1610 info->queue = q->queue; 1611 info->locked = q->locked; 1612 info->owner = q->owner; 1613 1614 /* set queue name */ 1615 if (!info->name[0]) 1616 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue); 1617 strscpy(q->name, info->name, sizeof(q->name)); 1618 snd_use_lock_free(&q->use_lock); 1619 1620 return 0; 1621 } 1622 1623 /* DELETE_QUEUE ioctl() */ 1624 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg) 1625 { 1626 struct snd_seq_queue_info *info = arg; 1627 1628 return snd_seq_queue_delete(client->number, info->queue); 1629 } 1630 1631 /* GET_QUEUE_INFO ioctl() */ 1632 static int snd_seq_ioctl_get_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 q = queueptr(info->queue); 1639 if (q == NULL) 1640 return -EINVAL; 1641 1642 memset(info, 0, sizeof(*info)); 1643 info->queue = q->queue; 1644 info->owner = q->owner; 1645 info->locked = q->locked; 1646 strscpy(info->name, q->name, sizeof(info->name)); 1647 queuefree(q); 1648 1649 return 0; 1650 } 1651 1652 /* SET_QUEUE_INFO ioctl() */ 1653 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1654 void *arg) 1655 { 1656 struct snd_seq_queue_info *info = arg; 1657 struct snd_seq_queue *q; 1658 1659 if (info->owner != client->number) 1660 return -EINVAL; 1661 1662 /* change owner/locked permission */ 1663 if (snd_seq_queue_check_access(info->queue, client->number)) { 1664 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0) 1665 return -EPERM; 1666 if (info->locked) 1667 snd_seq_queue_use(info->queue, client->number, 1); 1668 } else { 1669 return -EPERM; 1670 } 1671 1672 q = queueptr(info->queue); 1673 if (! q) 1674 return -EINVAL; 1675 if (q->owner != client->number) { 1676 queuefree(q); 1677 return -EPERM; 1678 } 1679 strscpy(q->name, info->name, sizeof(q->name)); 1680 queuefree(q); 1681 1682 return 0; 1683 } 1684 1685 /* GET_NAMED_QUEUE ioctl() */ 1686 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, 1687 void *arg) 1688 { 1689 struct snd_seq_queue_info *info = arg; 1690 struct snd_seq_queue *q; 1691 1692 q = snd_seq_queue_find_name(info->name); 1693 if (q == NULL) 1694 return -EINVAL; 1695 info->queue = q->queue; 1696 info->owner = q->owner; 1697 info->locked = q->locked; 1698 queuefree(q); 1699 1700 return 0; 1701 } 1702 1703 /* GET_QUEUE_STATUS ioctl() */ 1704 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1705 void *arg) 1706 { 1707 struct snd_seq_queue_status *status = arg; 1708 struct snd_seq_queue *queue; 1709 struct snd_seq_timer *tmr; 1710 1711 queue = queueptr(status->queue); 1712 if (queue == NULL) 1713 return -EINVAL; 1714 memset(status, 0, sizeof(*status)); 1715 status->queue = queue->queue; 1716 1717 tmr = queue->timer; 1718 status->events = queue->tickq->cells + queue->timeq->cells; 1719 1720 status->time = snd_seq_timer_get_cur_time(tmr, true); 1721 status->tick = snd_seq_timer_get_cur_tick(tmr); 1722 1723 status->running = tmr->running; 1724 1725 status->flags = queue->flags; 1726 queuefree(queue); 1727 1728 return 0; 1729 } 1730 1731 1732 /* GET_QUEUE_TEMPO ioctl() */ 1733 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1734 void *arg) 1735 { 1736 struct snd_seq_queue_tempo *tempo = arg; 1737 struct snd_seq_queue *queue; 1738 struct snd_seq_timer *tmr; 1739 1740 queue = queueptr(tempo->queue); 1741 if (queue == NULL) 1742 return -EINVAL; 1743 memset(tempo, 0, sizeof(*tempo)); 1744 tempo->queue = queue->queue; 1745 1746 tmr = queue->timer; 1747 1748 tempo->tempo = tmr->tempo; 1749 tempo->ppq = tmr->ppq; 1750 tempo->skew_value = tmr->skew; 1751 tempo->skew_base = tmr->skew_base; 1752 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 4)) 1753 tempo->tempo_base = tmr->tempo_base; 1754 queuefree(queue); 1755 1756 return 0; 1757 } 1758 1759 1760 /* SET_QUEUE_TEMPO ioctl() */ 1761 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1762 { 1763 if (!snd_seq_queue_check_access(tempo->queue, client)) 1764 return -EPERM; 1765 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1766 } 1767 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1768 1769 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1770 void *arg) 1771 { 1772 struct snd_seq_queue_tempo *tempo = arg; 1773 int result; 1774 1775 if (client->user_pversion < SNDRV_PROTOCOL_VERSION(1, 0, 4)) 1776 tempo->tempo_base = 0; 1777 result = snd_seq_set_queue_tempo(client->number, tempo); 1778 return result < 0 ? result : 0; 1779 } 1780 1781 1782 /* GET_QUEUE_TIMER ioctl() */ 1783 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1784 void *arg) 1785 { 1786 struct snd_seq_queue_timer *timer = arg; 1787 struct snd_seq_queue *queue; 1788 struct snd_seq_timer *tmr; 1789 1790 queue = queueptr(timer->queue); 1791 if (queue == NULL) 1792 return -EINVAL; 1793 1794 mutex_lock(&queue->timer_mutex); 1795 tmr = queue->timer; 1796 memset(timer, 0, sizeof(*timer)); 1797 timer->queue = queue->queue; 1798 1799 timer->type = tmr->type; 1800 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1801 timer->u.alsa.id = tmr->alsa_id; 1802 timer->u.alsa.resolution = tmr->preferred_resolution; 1803 } 1804 mutex_unlock(&queue->timer_mutex); 1805 queuefree(queue); 1806 1807 return 0; 1808 } 1809 1810 1811 /* SET_QUEUE_TIMER ioctl() */ 1812 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1813 void *arg) 1814 { 1815 struct snd_seq_queue_timer *timer = arg; 1816 int result = 0; 1817 1818 if (timer->type != SNDRV_SEQ_TIMER_ALSA) 1819 return -EINVAL; 1820 1821 if (snd_seq_queue_check_access(timer->queue, client->number)) { 1822 struct snd_seq_queue *q; 1823 struct snd_seq_timer *tmr; 1824 1825 q = queueptr(timer->queue); 1826 if (q == NULL) 1827 return -ENXIO; 1828 mutex_lock(&q->timer_mutex); 1829 tmr = q->timer; 1830 snd_seq_queue_timer_close(timer->queue); 1831 tmr->type = timer->type; 1832 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1833 tmr->alsa_id = timer->u.alsa.id; 1834 tmr->preferred_resolution = timer->u.alsa.resolution; 1835 } 1836 result = snd_seq_queue_timer_open(timer->queue); 1837 mutex_unlock(&q->timer_mutex); 1838 queuefree(q); 1839 } else { 1840 return -EPERM; 1841 } 1842 1843 return result; 1844 } 1845 1846 1847 /* GET_QUEUE_CLIENT ioctl() */ 1848 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1849 void *arg) 1850 { 1851 struct snd_seq_queue_client *info = arg; 1852 int used; 1853 1854 used = snd_seq_queue_is_used(info->queue, client->number); 1855 if (used < 0) 1856 return -EINVAL; 1857 info->used = used; 1858 info->client = client->number; 1859 1860 return 0; 1861 } 1862 1863 1864 /* SET_QUEUE_CLIENT ioctl() */ 1865 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1866 void *arg) 1867 { 1868 struct snd_seq_queue_client *info = arg; 1869 int err; 1870 1871 if (info->used >= 0) { 1872 err = snd_seq_queue_use(info->queue, client->number, info->used); 1873 if (err < 0) 1874 return err; 1875 } 1876 1877 return snd_seq_ioctl_get_queue_client(client, arg); 1878 } 1879 1880 1881 /* GET_CLIENT_POOL ioctl() */ 1882 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1883 void *arg) 1884 { 1885 struct snd_seq_client_pool *info = arg; 1886 struct snd_seq_client *cptr; 1887 1888 cptr = client_load_and_use_ptr(info->client); 1889 if (cptr == NULL) 1890 return -ENOENT; 1891 memset(info, 0, sizeof(*info)); 1892 info->client = cptr->number; 1893 info->output_pool = cptr->pool->size; 1894 info->output_room = cptr->pool->room; 1895 info->output_free = info->output_pool; 1896 info->output_free = snd_seq_unused_cells(cptr->pool); 1897 if (cptr->type == USER_CLIENT) { 1898 info->input_pool = cptr->data.user.fifo_pool_size; 1899 info->input_free = info->input_pool; 1900 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo); 1901 } else { 1902 info->input_pool = 0; 1903 info->input_free = 0; 1904 } 1905 snd_seq_client_unlock(cptr); 1906 1907 return 0; 1908 } 1909 1910 /* SET_CLIENT_POOL ioctl() */ 1911 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1912 void *arg) 1913 { 1914 struct snd_seq_client_pool *info = arg; 1915 int rc; 1916 1917 if (client->number != info->client) 1918 return -EINVAL; /* can't change other clients */ 1919 1920 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS && 1921 (! snd_seq_write_pool_allocated(client) || 1922 info->output_pool != client->pool->size)) { 1923 if (snd_seq_write_pool_allocated(client)) { 1924 /* is the pool in use? */ 1925 if (atomic_read(&client->pool->counter)) 1926 return -EBUSY; 1927 /* remove all existing cells */ 1928 snd_seq_pool_mark_closing(client->pool); 1929 snd_seq_pool_done(client->pool); 1930 } 1931 client->pool->size = info->output_pool; 1932 rc = snd_seq_pool_init(client->pool); 1933 if (rc < 0) 1934 return rc; 1935 } 1936 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1937 info->input_pool >= 1 && 1938 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1939 info->input_pool != client->data.user.fifo_pool_size) { 1940 /* change pool size */ 1941 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool); 1942 if (rc < 0) 1943 return rc; 1944 client->data.user.fifo_pool_size = info->input_pool; 1945 } 1946 if (info->output_room >= 1 && 1947 info->output_room <= client->pool->size) { 1948 client->pool->room = info->output_room; 1949 } 1950 1951 return snd_seq_ioctl_get_client_pool(client, arg); 1952 } 1953 1954 1955 /* REMOVE_EVENTS ioctl() */ 1956 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1957 void *arg) 1958 { 1959 struct snd_seq_remove_events *info = arg; 1960 1961 /* 1962 * Input mostly not implemented XXX. 1963 */ 1964 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1965 /* 1966 * No restrictions so for a user client we can clear 1967 * the whole fifo 1968 */ 1969 if (client->type == USER_CLIENT && client->data.user.fifo) 1970 snd_seq_fifo_clear(client->data.user.fifo); 1971 } 1972 1973 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1974 snd_seq_queue_remove_cells(client->number, info); 1975 1976 return 0; 1977 } 1978 1979 1980 /* 1981 * get subscription info 1982 */ 1983 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1984 void *arg) 1985 { 1986 struct snd_seq_port_subscribe *subs = arg; 1987 int result; 1988 struct snd_seq_client *sender = NULL; 1989 struct snd_seq_client_port *sport = NULL; 1990 1991 result = -EINVAL; 1992 sender = client_load_and_use_ptr(subs->sender.client); 1993 if (!sender) 1994 goto __end; 1995 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1996 if (!sport) 1997 goto __end; 1998 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest, 1999 subs); 2000 __end: 2001 if (sport) 2002 snd_seq_port_unlock(sport); 2003 if (sender) 2004 snd_seq_client_unlock(sender); 2005 2006 return result; 2007 } 2008 2009 2010 /* 2011 * get subscription info - check only its presence 2012 */ 2013 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg) 2014 { 2015 struct snd_seq_query_subs *subs = arg; 2016 int result = -ENXIO; 2017 struct snd_seq_client *cptr = NULL; 2018 struct snd_seq_client_port *port = NULL; 2019 struct snd_seq_port_subs_info *group; 2020 struct list_head *p; 2021 int i; 2022 2023 cptr = client_load_and_use_ptr(subs->root.client); 2024 if (!cptr) 2025 goto __end; 2026 port = snd_seq_port_use_ptr(cptr, subs->root.port); 2027 if (!port) 2028 goto __end; 2029 2030 switch (subs->type) { 2031 case SNDRV_SEQ_QUERY_SUBS_READ: 2032 group = &port->c_src; 2033 break; 2034 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2035 group = &port->c_dest; 2036 break; 2037 default: 2038 goto __end; 2039 } 2040 2041 down_read(&group->list_mutex); 2042 /* search for the subscriber */ 2043 subs->num_subs = group->count; 2044 i = 0; 2045 result = -ENOENT; 2046 list_for_each(p, &group->list_head) { 2047 if (i++ == subs->index) { 2048 /* found! */ 2049 struct snd_seq_subscribers *s; 2050 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) { 2051 s = list_entry(p, struct snd_seq_subscribers, src_list); 2052 subs->addr = s->info.dest; 2053 } else { 2054 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2055 subs->addr = s->info.sender; 2056 } 2057 subs->flags = s->info.flags; 2058 subs->queue = s->info.queue; 2059 result = 0; 2060 break; 2061 } 2062 } 2063 up_read(&group->list_mutex); 2064 2065 __end: 2066 if (port) 2067 snd_seq_port_unlock(port); 2068 if (cptr) 2069 snd_seq_client_unlock(cptr); 2070 2071 return result; 2072 } 2073 2074 2075 /* 2076 * query next client 2077 */ 2078 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2079 void *arg) 2080 { 2081 struct snd_seq_client_info *info = arg; 2082 struct snd_seq_client *cptr = NULL; 2083 2084 /* search for next client */ 2085 if (info->client < INT_MAX) 2086 info->client++; 2087 if (info->client < 0) 2088 info->client = 0; 2089 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) { 2090 cptr = client_load_and_use_ptr(info->client); 2091 if (cptr) 2092 break; /* found */ 2093 } 2094 if (cptr == NULL) 2095 return -ENOENT; 2096 2097 get_client_info(cptr, info); 2098 snd_seq_client_unlock(cptr); 2099 2100 return 0; 2101 } 2102 2103 /* 2104 * query next port 2105 */ 2106 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2107 void *arg) 2108 { 2109 struct snd_seq_port_info *info = arg; 2110 struct snd_seq_client *cptr; 2111 struct snd_seq_client_port *port = NULL; 2112 2113 cptr = client_load_and_use_ptr(info->addr.client); 2114 if (cptr == NULL) 2115 return -ENXIO; 2116 2117 /* search for next port */ 2118 info->addr.port++; 2119 port = snd_seq_port_query_nearest(cptr, info); 2120 if (port == NULL) { 2121 snd_seq_client_unlock(cptr); 2122 return -ENOENT; 2123 } 2124 2125 /* get port info */ 2126 info->addr = port->addr; 2127 snd_seq_get_port_info(port, info); 2128 snd_seq_port_unlock(port); 2129 snd_seq_client_unlock(cptr); 2130 2131 return 0; 2132 } 2133 2134 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2135 #define NUM_UMP_INFOS (SNDRV_UMP_MAX_BLOCKS + 1) 2136 2137 static void free_ump_info(struct snd_seq_client *client) 2138 { 2139 int i; 2140 2141 if (!client->ump_info) 2142 return; 2143 for (i = 0; i < NUM_UMP_INFOS; i++) 2144 kfree(client->ump_info[i]); 2145 kfree(client->ump_info); 2146 client->ump_info = NULL; 2147 } 2148 2149 static void terminate_ump_info_strings(void *p, int type) 2150 { 2151 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) { 2152 struct snd_ump_endpoint_info *ep = p; 2153 ep->name[sizeof(ep->name) - 1] = 0; 2154 } else { 2155 struct snd_ump_block_info *bp = p; 2156 bp->name[sizeof(bp->name) - 1] = 0; 2157 } 2158 } 2159 2160 #ifdef CONFIG_SND_PROC_FS 2161 static void dump_ump_info(struct snd_info_buffer *buffer, 2162 struct snd_seq_client *client) 2163 { 2164 struct snd_ump_endpoint_info *ep; 2165 struct snd_ump_block_info *bp; 2166 int i; 2167 2168 if (!client->ump_info) 2169 return; 2170 ep = client->ump_info[SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT]; 2171 if (ep && *ep->name) 2172 snd_iprintf(buffer, " UMP Endpoint: \"%s\"\n", ep->name); 2173 for (i = 0; i < SNDRV_UMP_MAX_BLOCKS; i++) { 2174 bp = client->ump_info[i + 1]; 2175 if (bp && *bp->name) { 2176 snd_iprintf(buffer, " UMP Block %d: \"%s\" [%s]\n", 2177 i, bp->name, 2178 bp->active ? "Active" : "Inactive"); 2179 snd_iprintf(buffer, " Groups: %d-%d\n", 2180 bp->first_group + 1, 2181 bp->first_group + bp->num_groups); 2182 } 2183 } 2184 } 2185 #endif 2186 2187 /* UMP-specific ioctls -- called directly without data copy */ 2188 static int snd_seq_ioctl_client_ump_info(struct snd_seq_client *caller, 2189 unsigned int cmd, 2190 unsigned long arg) 2191 { 2192 struct snd_seq_client_ump_info __user *argp = 2193 (struct snd_seq_client_ump_info __user *)arg; 2194 struct snd_seq_client *cptr; 2195 int client, type, err = 0; 2196 size_t size; 2197 void *p; 2198 2199 if (get_user(client, &argp->client) || get_user(type, &argp->type)) 2200 return -EFAULT; 2201 if (cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO && 2202 caller->number != client) 2203 return -EPERM; 2204 if (type < 0 || type >= NUM_UMP_INFOS) 2205 return -EINVAL; 2206 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) 2207 size = sizeof(struct snd_ump_endpoint_info); 2208 else 2209 size = sizeof(struct snd_ump_block_info); 2210 cptr = client_load_and_use_ptr(client); 2211 if (!cptr) 2212 return -ENOENT; 2213 2214 mutex_lock(&cptr->ioctl_mutex); 2215 if (!cptr->midi_version) { 2216 err = -EBADFD; 2217 goto error; 2218 } 2219 2220 if (cmd == SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO) { 2221 if (!cptr->ump_info) 2222 p = NULL; 2223 else 2224 p = cptr->ump_info[type]; 2225 if (!p) { 2226 err = -ENODEV; 2227 goto error; 2228 } 2229 if (copy_to_user(argp->info, p, size)) { 2230 err = -EFAULT; 2231 goto error; 2232 } 2233 } else { 2234 if (cptr->type != USER_CLIENT) { 2235 err = -EBADFD; 2236 goto error; 2237 } 2238 if (!cptr->ump_info) { 2239 cptr->ump_info = kcalloc(NUM_UMP_INFOS, 2240 sizeof(void *), GFP_KERNEL); 2241 if (!cptr->ump_info) { 2242 err = -ENOMEM; 2243 goto error; 2244 } 2245 } 2246 p = memdup_user(argp->info, size); 2247 if (IS_ERR(p)) { 2248 err = PTR_ERR(p); 2249 goto error; 2250 } 2251 kfree(cptr->ump_info[type]); 2252 terminate_ump_info_strings(p, type); 2253 cptr->ump_info[type] = p; 2254 } 2255 2256 error: 2257 mutex_unlock(&cptr->ioctl_mutex); 2258 snd_seq_client_unlock(cptr); 2259 if (!err && cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO) { 2260 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) 2261 snd_seq_system_ump_notify(client, 0, 2262 SNDRV_SEQ_EVENT_UMP_EP_CHANGE, 2263 false); 2264 else 2265 snd_seq_system_ump_notify(client, type - 1, 2266 SNDRV_SEQ_EVENT_UMP_BLOCK_CHANGE, 2267 false); 2268 } 2269 return err; 2270 } 2271 #endif 2272 2273 /* -------------------------------------------------------- */ 2274 2275 static const struct ioctl_handler { 2276 unsigned int cmd; 2277 int (*func)(struct snd_seq_client *client, void *arg); 2278 } ioctl_handlers[] = { 2279 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion }, 2280 { SNDRV_SEQ_IOCTL_USER_PVERSION, snd_seq_ioctl_user_pversion }, 2281 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id }, 2282 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2283 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2284 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2285 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2286 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2287 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2288 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2289 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2290 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2291 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2292 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2293 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2294 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2295 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2296 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2297 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2298 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2299 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2300 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2301 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2302 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2303 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2304 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2305 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2306 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2307 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2308 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2309 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2310 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2311 { 0, NULL }, 2312 }; 2313 2314 static long snd_seq_ioctl(struct file *file, unsigned int cmd, 2315 unsigned long arg) 2316 { 2317 struct snd_seq_client *client = file->private_data; 2318 /* To use kernel stack for ioctl data. */ 2319 union { 2320 int pversion; 2321 int client_id; 2322 struct snd_seq_system_info system_info; 2323 struct snd_seq_running_info running_info; 2324 struct snd_seq_client_info client_info; 2325 struct snd_seq_port_info port_info; 2326 struct snd_seq_port_subscribe port_subscribe; 2327 struct snd_seq_queue_info queue_info; 2328 struct snd_seq_queue_status queue_status; 2329 struct snd_seq_queue_tempo tempo; 2330 struct snd_seq_queue_timer queue_timer; 2331 struct snd_seq_queue_client queue_client; 2332 struct snd_seq_client_pool client_pool; 2333 struct snd_seq_remove_events remove_events; 2334 struct snd_seq_query_subs query_subs; 2335 } buf; 2336 const struct ioctl_handler *handler; 2337 unsigned long size; 2338 int err; 2339 2340 if (snd_BUG_ON(!client)) 2341 return -ENXIO; 2342 2343 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2344 /* exception - handling large data */ 2345 switch (cmd) { 2346 case SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO: 2347 case SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO: 2348 return snd_seq_ioctl_client_ump_info(client, cmd, arg); 2349 } 2350 #endif 2351 2352 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2353 if (handler->cmd == cmd) 2354 break; 2355 } 2356 if (handler->cmd == 0) 2357 return -ENOTTY; 2358 2359 memset(&buf, 0, sizeof(buf)); 2360 2361 /* 2362 * All of ioctl commands for ALSA sequencer get an argument of size 2363 * within 13 bits. We can safely pick up the size from the command. 2364 */ 2365 size = _IOC_SIZE(handler->cmd); 2366 if (handler->cmd & IOC_IN) { 2367 if (copy_from_user(&buf, (const void __user *)arg, size)) 2368 return -EFAULT; 2369 } 2370 2371 mutex_lock(&client->ioctl_mutex); 2372 err = handler->func(client, &buf); 2373 mutex_unlock(&client->ioctl_mutex); 2374 if (err >= 0) { 2375 /* Some commands includes a bug in 'dir' field. */ 2376 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT || 2377 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL || 2378 (handler->cmd & IOC_OUT)) 2379 if (copy_to_user((void __user *)arg, &buf, size)) 2380 return -EFAULT; 2381 } 2382 2383 return err; 2384 } 2385 2386 #ifdef CONFIG_COMPAT 2387 #include "seq_compat.c" 2388 #else 2389 #define snd_seq_ioctl_compat NULL 2390 #endif 2391 2392 /* -------------------------------------------------------- */ 2393 2394 2395 /* exported to kernel modules */ 2396 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2397 const char *name_fmt, ...) 2398 { 2399 struct snd_seq_client *client; 2400 va_list args; 2401 2402 if (snd_BUG_ON(in_interrupt())) 2403 return -EBUSY; 2404 2405 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2406 return -EINVAL; 2407 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2408 return -EINVAL; 2409 2410 mutex_lock(®ister_mutex); 2411 2412 if (card) { 2413 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2414 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2415 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2416 client_index = -1; 2417 } 2418 2419 /* empty write queue as default */ 2420 client = seq_create_client1(client_index, 0); 2421 if (client == NULL) { 2422 mutex_unlock(®ister_mutex); 2423 return -EBUSY; /* failure code */ 2424 } 2425 usage_alloc(&client_usage, 1); 2426 2427 client->accept_input = 1; 2428 client->accept_output = 1; 2429 client->data.kernel.card = card; 2430 client->user_pversion = SNDRV_SEQ_VERSION; 2431 2432 va_start(args, name_fmt); 2433 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2434 va_end(args); 2435 2436 client->type = KERNEL_CLIENT; 2437 mutex_unlock(®ister_mutex); 2438 2439 /* make others aware this new client */ 2440 snd_seq_system_client_ev_client_start(client->number); 2441 2442 /* return client number to caller */ 2443 return client->number; 2444 } 2445 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2446 2447 /* exported to kernel modules */ 2448 int snd_seq_delete_kernel_client(int client) 2449 { 2450 struct snd_seq_client *ptr; 2451 2452 if (snd_BUG_ON(in_interrupt())) 2453 return -EBUSY; 2454 2455 ptr = clientptr(client); 2456 if (ptr == NULL) 2457 return -EINVAL; 2458 2459 seq_free_client(ptr); 2460 kfree(ptr); 2461 return 0; 2462 } 2463 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2464 2465 /* 2466 * exported, called by kernel clients to enqueue events (w/o blocking) 2467 * 2468 * RETURN VALUE: zero if succeed, negative if error 2469 */ 2470 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, 2471 struct file *file, bool blocking) 2472 { 2473 struct snd_seq_client *cptr; 2474 int result; 2475 2476 if (snd_BUG_ON(!ev)) 2477 return -EINVAL; 2478 2479 if (!snd_seq_ev_is_ump(ev)) { 2480 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2481 return 0; /* ignore this */ 2482 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2483 return -EINVAL; /* quoted events can't be enqueued */ 2484 } 2485 2486 /* fill in client number */ 2487 ev->source.client = client; 2488 2489 if (check_event_type_and_length(ev)) 2490 return -EINVAL; 2491 2492 cptr = client_load_and_use_ptr(client); 2493 if (cptr == NULL) 2494 return -EINVAL; 2495 2496 if (!cptr->accept_output) { 2497 result = -EPERM; 2498 } else { /* send it */ 2499 mutex_lock(&cptr->ioctl_mutex); 2500 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, 2501 false, 0, 2502 &cptr->ioctl_mutex); 2503 mutex_unlock(&cptr->ioctl_mutex); 2504 } 2505 2506 snd_seq_client_unlock(cptr); 2507 return result; 2508 } 2509 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2510 2511 /* 2512 * exported, called by kernel clients to dispatch events directly to other 2513 * clients, bypassing the queues. Event time-stamp will be updated. 2514 * 2515 * RETURN VALUE: negative = delivery failed, 2516 * zero, or positive: the number of delivered events 2517 */ 2518 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2519 int atomic, int hop) 2520 { 2521 struct snd_seq_client *cptr; 2522 int result; 2523 2524 if (snd_BUG_ON(!ev)) 2525 return -EINVAL; 2526 2527 /* fill in client number */ 2528 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2529 ev->source.client = client; 2530 2531 if (check_event_type_and_length(ev)) 2532 return -EINVAL; 2533 2534 cptr = snd_seq_client_use_ptr(client); 2535 if (cptr == NULL) 2536 return -EINVAL; 2537 2538 if (!cptr->accept_output) 2539 result = -EPERM; 2540 else 2541 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2542 2543 snd_seq_client_unlock(cptr); 2544 return result; 2545 } 2546 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2547 2548 /** 2549 * snd_seq_kernel_client_ctl - operate a command for a client with data in 2550 * kernel space. 2551 * @clientid: A numerical ID for a client. 2552 * @cmd: An ioctl(2) command for ALSA sequencer operation. 2553 * @arg: A pointer to data in kernel space. 2554 * 2555 * Against its name, both kernel/application client can be handled by this 2556 * kernel API. A pointer of 'arg' argument should be in kernel space. 2557 * 2558 * Return: 0 at success. Negative error code at failure. 2559 */ 2560 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2561 { 2562 const struct ioctl_handler *handler; 2563 struct snd_seq_client *client; 2564 2565 client = clientptr(clientid); 2566 if (client == NULL) 2567 return -ENXIO; 2568 2569 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2570 if (handler->cmd == cmd) 2571 return handler->func(client, arg); 2572 } 2573 2574 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2575 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2576 return -ENOTTY; 2577 } 2578 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2579 2580 /* exported (for OSS emulator) */ 2581 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2582 { 2583 struct snd_seq_client *client; 2584 2585 client = clientptr(clientid); 2586 if (client == NULL) 2587 return -ENXIO; 2588 2589 if (! snd_seq_write_pool_allocated(client)) 2590 return 1; 2591 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2592 return 1; 2593 return 0; 2594 } 2595 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2596 2597 /* get a sequencer client object; for internal use from a kernel client */ 2598 struct snd_seq_client *snd_seq_kernel_client_get(int id) 2599 { 2600 return snd_seq_client_use_ptr(id); 2601 } 2602 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_get); 2603 2604 /* put a sequencer client object; for internal use from a kernel client */ 2605 void snd_seq_kernel_client_put(struct snd_seq_client *cptr) 2606 { 2607 if (cptr) 2608 snd_seq_client_unlock(cptr); 2609 } 2610 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_put); 2611 2612 /*---------------------------------------------------------------------------*/ 2613 2614 #ifdef CONFIG_SND_PROC_FS 2615 /* 2616 * /proc interface 2617 */ 2618 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2619 struct snd_seq_port_subs_info *group, 2620 int is_src, char *msg) 2621 { 2622 struct list_head *p; 2623 struct snd_seq_subscribers *s; 2624 int count = 0; 2625 2626 down_read(&group->list_mutex); 2627 if (list_empty(&group->list_head)) { 2628 up_read(&group->list_mutex); 2629 return; 2630 } 2631 snd_iprintf(buffer, msg); 2632 list_for_each(p, &group->list_head) { 2633 if (is_src) 2634 s = list_entry(p, struct snd_seq_subscribers, src_list); 2635 else 2636 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2637 if (count++) 2638 snd_iprintf(buffer, ", "); 2639 snd_iprintf(buffer, "%d:%d", 2640 is_src ? s->info.dest.client : s->info.sender.client, 2641 is_src ? s->info.dest.port : s->info.sender.port); 2642 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2643 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2644 if (group->exclusive) 2645 snd_iprintf(buffer, "[ex]"); 2646 } 2647 up_read(&group->list_mutex); 2648 snd_iprintf(buffer, "\n"); 2649 } 2650 2651 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2652 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2653 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2654 2655 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2656 2657 static const char *port_direction_name(unsigned char dir) 2658 { 2659 static const char *names[4] = { 2660 "-", "In", "Out", "In/Out" 2661 }; 2662 2663 if (dir > SNDRV_SEQ_PORT_DIR_BIDIRECTION) 2664 return "Invalid"; 2665 return names[dir]; 2666 } 2667 2668 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2669 struct snd_seq_client *client) 2670 { 2671 struct snd_seq_client_port *p; 2672 2673 mutex_lock(&client->ports_mutex); 2674 list_for_each_entry(p, &client->ports_list_head, list) { 2675 if (p->capability & SNDRV_SEQ_PORT_CAP_INACTIVE) 2676 continue; 2677 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c) [%s]", 2678 p->addr.port, p->name, 2679 FLAG_PERM_RD(p->capability), 2680 FLAG_PERM_WR(p->capability), 2681 FLAG_PERM_EX(p->capability), 2682 FLAG_PERM_DUPLEX(p->capability), 2683 port_direction_name(p->direction)); 2684 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2685 if (snd_seq_client_is_midi2(client) && p->is_midi1) 2686 snd_iprintf(buffer, " [MIDI1]"); 2687 #endif 2688 snd_iprintf(buffer, "\n"); 2689 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2690 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2691 } 2692 mutex_unlock(&client->ports_mutex); 2693 } 2694 2695 static const char *midi_version_string(unsigned int version) 2696 { 2697 switch (version) { 2698 case SNDRV_SEQ_CLIENT_LEGACY_MIDI: 2699 return "Legacy"; 2700 case SNDRV_SEQ_CLIENT_UMP_MIDI_1_0: 2701 return "UMP MIDI1"; 2702 case SNDRV_SEQ_CLIENT_UMP_MIDI_2_0: 2703 return "UMP MIDI2"; 2704 default: 2705 return "Unknown"; 2706 } 2707 } 2708 2709 /* exported to seq_info.c */ 2710 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2711 struct snd_info_buffer *buffer) 2712 { 2713 int c; 2714 struct snd_seq_client *client; 2715 2716 snd_iprintf(buffer, "Client info\n"); 2717 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2718 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2719 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2720 snd_iprintf(buffer, "\n"); 2721 2722 /* list the client table */ 2723 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2724 client = client_load_and_use_ptr(c); 2725 if (client == NULL) 2726 continue; 2727 if (client->type == NO_CLIENT) { 2728 snd_seq_client_unlock(client); 2729 continue; 2730 } 2731 2732 snd_iprintf(buffer, "Client %3d : \"%s\" [%s %s]\n", 2733 c, client->name, 2734 client->type == USER_CLIENT ? "User" : "Kernel", 2735 midi_version_string(client->midi_version)); 2736 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2737 dump_ump_info(buffer, client); 2738 #endif 2739 snd_seq_info_dump_ports(buffer, client); 2740 if (snd_seq_write_pool_allocated(client)) { 2741 snd_iprintf(buffer, " Output pool :\n"); 2742 snd_seq_info_pool(buffer, client->pool, " "); 2743 } 2744 if (client->type == USER_CLIENT && client->data.user.fifo && 2745 client->data.user.fifo->pool) { 2746 snd_iprintf(buffer, " Input pool :\n"); 2747 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2748 } 2749 snd_seq_client_unlock(client); 2750 } 2751 } 2752 #endif /* CONFIG_SND_PROC_FS */ 2753 2754 /*---------------------------------------------------------------------------*/ 2755 2756 2757 /* 2758 * REGISTRATION PART 2759 */ 2760 2761 static const struct file_operations snd_seq_f_ops = 2762 { 2763 .owner = THIS_MODULE, 2764 .read = snd_seq_read, 2765 .write = snd_seq_write, 2766 .open = snd_seq_open, 2767 .release = snd_seq_release, 2768 .poll = snd_seq_poll, 2769 .unlocked_ioctl = snd_seq_ioctl, 2770 .compat_ioctl = snd_seq_ioctl_compat, 2771 }; 2772 2773 static struct device *seq_dev; 2774 2775 /* 2776 * register sequencer device 2777 */ 2778 int __init snd_sequencer_device_init(void) 2779 { 2780 int err; 2781 2782 err = snd_device_alloc(&seq_dev, NULL); 2783 if (err < 0) 2784 return err; 2785 dev_set_name(seq_dev, "seq"); 2786 2787 mutex_lock(®ister_mutex); 2788 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2789 &snd_seq_f_ops, NULL, seq_dev); 2790 mutex_unlock(®ister_mutex); 2791 if (err < 0) { 2792 put_device(seq_dev); 2793 return err; 2794 } 2795 2796 return 0; 2797 } 2798 2799 2800 2801 /* 2802 * unregister sequencer device 2803 */ 2804 void snd_sequencer_device_done(void) 2805 { 2806 snd_unregister_device(seq_dev); 2807 put_device(seq_dev); 2808 } 2809