1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Digital Audio (PCM) abstract layer 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 */ 6 7 #include <linux/compat.h> 8 #include <linux/mm.h> 9 #include <linux/module.h> 10 #include <linux/file.h> 11 #include <linux/slab.h> 12 #include <linux/sched/signal.h> 13 #include <linux/time.h> 14 #include <linux/pm_qos.h> 15 #include <linux/io.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/vmalloc.h> 18 #include <sound/core.h> 19 #include <sound/control.h> 20 #include <sound/info.h> 21 #include <sound/pcm.h> 22 #include <sound/pcm_params.h> 23 #include <sound/timer.h> 24 #include <sound/minors.h> 25 #include <linux/uio.h> 26 #include <linux/delay.h> 27 28 #include "pcm_local.h" 29 30 #ifdef CONFIG_SND_DEBUG 31 #define CREATE_TRACE_POINTS 32 #include "pcm_param_trace.h" 33 #else 34 #define trace_hw_mask_param_enabled() 0 35 #define trace_hw_interval_param_enabled() 0 36 #define trace_hw_mask_param(substream, type, index, prev, curr) 37 #define trace_hw_interval_param(substream, type, index, prev, curr) 38 #endif 39 40 /* 41 * Compatibility 42 */ 43 44 struct snd_pcm_hw_params_old { 45 unsigned int flags; 46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 47 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 50 unsigned int rmask; 51 unsigned int cmask; 52 unsigned int info; 53 unsigned int msbits; 54 unsigned int rate_num; 55 unsigned int rate_den; 56 snd_pcm_uframes_t fifo_size; 57 unsigned char reserved[64]; 58 }; 59 60 #ifdef CONFIG_SND_SUPPORT_OLD_API 61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 63 64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 65 struct snd_pcm_hw_params_old __user * _oparams); 66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params_old __user * _oparams); 68 #endif 69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 70 71 /* 72 * 73 */ 74 75 static DECLARE_RWSEM(snd_pcm_link_rwsem); 76 77 void snd_pcm_group_init(struct snd_pcm_group *group) 78 { 79 spin_lock_init(&group->lock); 80 mutex_init(&group->mutex); 81 INIT_LIST_HEAD(&group->substreams); 82 refcount_set(&group->refs, 1); 83 } 84 85 /* define group lock helpers */ 86 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 87 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 88 { \ 89 if (nonatomic) \ 90 mutex_ ## mutex_action(&group->mutex); \ 91 else \ 92 spin_ ## action(&group->lock); \ 93 } 94 95 DEFINE_PCM_GROUP_LOCK(lock, lock); 96 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 97 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 98 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 99 100 /** 101 * snd_pcm_stream_lock - Lock the PCM stream 102 * @substream: PCM substream 103 * 104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 105 * flag of the given substream. This also takes the global link rw lock 106 * (or rw sem), too, for avoiding the race with linked streams. 107 */ 108 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 109 { 110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 111 } 112 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 113 114 /** 115 * snd_pcm_stream_unlock - Unlock the PCM stream 116 * @substream: PCM substream 117 * 118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 119 */ 120 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 121 { 122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 123 } 124 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 125 126 /** 127 * snd_pcm_stream_lock_irq - Lock the PCM stream 128 * @substream: PCM substream 129 * 130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 132 * as snd_pcm_stream_lock(). 133 */ 134 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 135 { 136 snd_pcm_group_lock_irq(&substream->self_group, 137 substream->pcm->nonatomic); 138 } 139 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 140 141 static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream) 142 { 143 struct snd_pcm_group *group = &substream->self_group; 144 145 if (substream->pcm->nonatomic) 146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING); 147 else 148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING); 149 } 150 151 /** 152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 153 * @substream: PCM substream 154 * 155 * This is a counter-part of snd_pcm_stream_lock_irq(). 156 */ 157 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 158 { 159 snd_pcm_group_unlock_irq(&substream->self_group, 160 substream->pcm->nonatomic); 161 } 162 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 163 164 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 165 { 166 unsigned long flags = 0; 167 if (substream->pcm->nonatomic) 168 mutex_lock(&substream->self_group.mutex); 169 else 170 spin_lock_irqsave(&substream->self_group.lock, flags); 171 return flags; 172 } 173 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 174 175 /** 176 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 177 * @substream: PCM substream 178 * @flags: irq flags 179 * 180 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 181 */ 182 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 183 unsigned long flags) 184 { 185 if (substream->pcm->nonatomic) 186 mutex_unlock(&substream->self_group.mutex); 187 else 188 spin_unlock_irqrestore(&substream->self_group.lock, flags); 189 } 190 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 191 192 /* Run PCM ioctl ops */ 193 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream, 194 unsigned cmd, void *arg) 195 { 196 if (substream->ops->ioctl) 197 return substream->ops->ioctl(substream, cmd, arg); 198 else 199 return snd_pcm_lib_ioctl(substream, cmd, arg); 200 } 201 202 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 203 { 204 struct snd_pcm *pcm = substream->pcm; 205 struct snd_pcm_str *pstr = substream->pstr; 206 207 memset(info, 0, sizeof(*info)); 208 info->card = pcm->card->number; 209 info->device = pcm->device; 210 info->stream = substream->stream; 211 info->subdevice = substream->number; 212 strscpy(info->id, pcm->id, sizeof(info->id)); 213 strscpy(info->name, pcm->name, sizeof(info->name)); 214 info->dev_class = pcm->dev_class; 215 info->dev_subclass = pcm->dev_subclass; 216 info->subdevices_count = pstr->substream_count; 217 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 218 strscpy(info->subname, substream->name, sizeof(info->subname)); 219 220 return 0; 221 } 222 223 int snd_pcm_info_user(struct snd_pcm_substream *substream, 224 struct snd_pcm_info __user * _info) 225 { 226 struct snd_pcm_info *info; 227 int err; 228 229 info = kmalloc(sizeof(*info), GFP_KERNEL); 230 if (! info) 231 return -ENOMEM; 232 err = snd_pcm_info(substream, info); 233 if (err >= 0) { 234 if (copy_to_user(_info, info, sizeof(*info))) 235 err = -EFAULT; 236 } 237 kfree(info); 238 return err; 239 } 240 241 /* macro for simplified cast */ 242 #define PARAM_MASK_BIT(b) (1U << (__force int)(b)) 243 244 static bool hw_support_mmap(struct snd_pcm_substream *substream) 245 { 246 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 247 return false; 248 249 if (substream->ops->mmap || 250 (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV && 251 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC)) 252 return true; 253 254 return dma_can_mmap(substream->dma_buffer.dev.dev); 255 } 256 257 static int constrain_mask_params(struct snd_pcm_substream *substream, 258 struct snd_pcm_hw_params *params) 259 { 260 struct snd_pcm_hw_constraints *constrs = 261 &substream->runtime->hw_constraints; 262 struct snd_mask *m; 263 unsigned int k; 264 struct snd_mask old_mask; 265 int changed; 266 267 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 268 m = hw_param_mask(params, k); 269 if (snd_mask_empty(m)) 270 return -EINVAL; 271 272 /* This parameter is not requested to change by a caller. */ 273 if (!(params->rmask & PARAM_MASK_BIT(k))) 274 continue; 275 276 if (trace_hw_mask_param_enabled()) 277 old_mask = *m; 278 279 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 280 if (changed < 0) 281 return changed; 282 if (changed == 0) 283 continue; 284 285 /* Set corresponding flag so that the caller gets it. */ 286 trace_hw_mask_param(substream, k, 0, &old_mask, m); 287 params->cmask |= PARAM_MASK_BIT(k); 288 } 289 290 return 0; 291 } 292 293 static int constrain_interval_params(struct snd_pcm_substream *substream, 294 struct snd_pcm_hw_params *params) 295 { 296 struct snd_pcm_hw_constraints *constrs = 297 &substream->runtime->hw_constraints; 298 struct snd_interval *i; 299 unsigned int k; 300 struct snd_interval old_interval; 301 int changed; 302 303 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 304 i = hw_param_interval(params, k); 305 if (snd_interval_empty(i)) 306 return -EINVAL; 307 308 /* This parameter is not requested to change by a caller. */ 309 if (!(params->rmask & PARAM_MASK_BIT(k))) 310 continue; 311 312 if (trace_hw_interval_param_enabled()) 313 old_interval = *i; 314 315 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 316 if (changed < 0) 317 return changed; 318 if (changed == 0) 319 continue; 320 321 /* Set corresponding flag so that the caller gets it. */ 322 trace_hw_interval_param(substream, k, 0, &old_interval, i); 323 params->cmask |= PARAM_MASK_BIT(k); 324 } 325 326 return 0; 327 } 328 329 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 330 struct snd_pcm_hw_params *params) 331 { 332 struct snd_pcm_hw_constraints *constrs = 333 &substream->runtime->hw_constraints; 334 unsigned int k; 335 unsigned int *rstamps; 336 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 337 unsigned int stamp; 338 struct snd_pcm_hw_rule *r; 339 unsigned int d; 340 struct snd_mask old_mask; 341 struct snd_interval old_interval; 342 bool again; 343 int changed, err = 0; 344 345 /* 346 * Each application of rule has own sequence number. 347 * 348 * Each member of 'rstamps' array represents the sequence number of 349 * recent application of corresponding rule. 350 */ 351 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 352 if (!rstamps) 353 return -ENOMEM; 354 355 /* 356 * Each member of 'vstamps' array represents the sequence number of 357 * recent application of rule in which corresponding parameters were 358 * changed. 359 * 360 * In initial state, elements corresponding to parameters requested by 361 * a caller is 1. For unrequested parameters, corresponding members 362 * have 0 so that the parameters are never changed anymore. 363 */ 364 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 365 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0; 366 367 /* Due to the above design, actual sequence number starts at 2. */ 368 stamp = 2; 369 retry: 370 /* Apply all rules in order. */ 371 again = false; 372 for (k = 0; k < constrs->rules_num; k++) { 373 r = &constrs->rules[k]; 374 375 /* 376 * Check condition bits of this rule. When the rule has 377 * some condition bits, parameter without the bits is 378 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 379 * is an example of the condition bits. 380 */ 381 if (r->cond && !(r->cond & params->flags)) 382 continue; 383 384 /* 385 * The 'deps' array includes maximum four dependencies 386 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth 387 * member of this array is a sentinel and should be 388 * negative value. 389 * 390 * This rule should be processed in this time when dependent 391 * parameters were changed at former applications of the other 392 * rules. 393 */ 394 for (d = 0; r->deps[d] >= 0; d++) { 395 if (vstamps[r->deps[d]] > rstamps[k]) 396 break; 397 } 398 if (r->deps[d] < 0) 399 continue; 400 401 if (trace_hw_mask_param_enabled()) { 402 if (hw_is_mask(r->var)) 403 old_mask = *hw_param_mask(params, r->var); 404 } 405 if (trace_hw_interval_param_enabled()) { 406 if (hw_is_interval(r->var)) 407 old_interval = *hw_param_interval(params, r->var); 408 } 409 410 changed = r->func(params, r); 411 if (changed < 0) { 412 err = changed; 413 goto out; 414 } 415 416 /* 417 * When the parameter is changed, notify it to the caller 418 * by corresponding returned bit, then preparing for next 419 * iteration. 420 */ 421 if (changed && r->var >= 0) { 422 if (hw_is_mask(r->var)) { 423 trace_hw_mask_param(substream, r->var, 424 k + 1, &old_mask, 425 hw_param_mask(params, r->var)); 426 } 427 if (hw_is_interval(r->var)) { 428 trace_hw_interval_param(substream, r->var, 429 k + 1, &old_interval, 430 hw_param_interval(params, r->var)); 431 } 432 433 params->cmask |= PARAM_MASK_BIT(r->var); 434 vstamps[r->var] = stamp; 435 again = true; 436 } 437 438 rstamps[k] = stamp++; 439 } 440 441 /* Iterate to evaluate all rules till no parameters are changed. */ 442 if (again) 443 goto retry; 444 445 out: 446 kfree(rstamps); 447 return err; 448 } 449 450 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 451 struct snd_pcm_hw_params *params) 452 { 453 const struct snd_interval *i; 454 const struct snd_mask *m; 455 int err; 456 457 if (!params->msbits) { 458 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 459 if (snd_interval_single(i)) 460 params->msbits = snd_interval_value(i); 461 } 462 463 if (!params->rate_den) { 464 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 465 if (snd_interval_single(i)) { 466 params->rate_num = snd_interval_value(i); 467 params->rate_den = 1; 468 } 469 } 470 471 if (!params->fifo_size) { 472 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 473 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 474 if (snd_mask_single(m) && snd_interval_single(i)) { 475 err = snd_pcm_ops_ioctl(substream, 476 SNDRV_PCM_IOCTL1_FIFO_SIZE, 477 params); 478 if (err < 0) 479 return err; 480 } 481 } 482 483 if (!params->info) { 484 params->info = substream->runtime->hw.info; 485 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 486 SNDRV_PCM_INFO_DRAIN_TRIGGER); 487 if (!hw_support_mmap(substream)) 488 params->info &= ~(SNDRV_PCM_INFO_MMAP | 489 SNDRV_PCM_INFO_MMAP_VALID); 490 } 491 492 return 0; 493 } 494 495 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 496 struct snd_pcm_hw_params *params) 497 { 498 int err; 499 500 params->info = 0; 501 params->fifo_size = 0; 502 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 503 params->msbits = 0; 504 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) { 505 params->rate_num = 0; 506 params->rate_den = 0; 507 } 508 509 err = constrain_mask_params(substream, params); 510 if (err < 0) 511 return err; 512 513 err = constrain_interval_params(substream, params); 514 if (err < 0) 515 return err; 516 517 err = constrain_params_by_rules(substream, params); 518 if (err < 0) 519 return err; 520 521 params->rmask = 0; 522 523 return 0; 524 } 525 EXPORT_SYMBOL(snd_pcm_hw_refine); 526 527 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 528 struct snd_pcm_hw_params __user * _params) 529 { 530 struct snd_pcm_hw_params *params; 531 int err; 532 533 params = memdup_user(_params, sizeof(*params)); 534 if (IS_ERR(params)) 535 return PTR_ERR(params); 536 537 err = snd_pcm_hw_refine(substream, params); 538 if (err < 0) 539 goto end; 540 541 err = fixup_unreferenced_params(substream, params); 542 if (err < 0) 543 goto end; 544 545 if (copy_to_user(_params, params, sizeof(*params))) 546 err = -EFAULT; 547 end: 548 kfree(params); 549 return err; 550 } 551 552 static int period_to_usecs(struct snd_pcm_runtime *runtime) 553 { 554 int usecs; 555 556 if (! runtime->rate) 557 return -1; /* invalid */ 558 559 /* take 75% of period time as the deadline */ 560 usecs = (750000 / runtime->rate) * runtime->period_size; 561 usecs += ((750000 % runtime->rate) * runtime->period_size) / 562 runtime->rate; 563 564 return usecs; 565 } 566 567 static void snd_pcm_set_state(struct snd_pcm_substream *substream, 568 snd_pcm_state_t state) 569 { 570 snd_pcm_stream_lock_irq(substream); 571 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 572 substream->runtime->status->state = state; 573 snd_pcm_stream_unlock_irq(substream); 574 } 575 576 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 577 int event) 578 { 579 #ifdef CONFIG_SND_PCM_TIMER 580 if (substream->timer) 581 snd_timer_notify(substream->timer, event, 582 &substream->runtime->trigger_tstamp); 583 #endif 584 } 585 586 void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq) 587 { 588 if (substream->runtime && substream->runtime->stop_operating) { 589 substream->runtime->stop_operating = false; 590 if (substream->ops && substream->ops->sync_stop) 591 substream->ops->sync_stop(substream); 592 else if (sync_irq && substream->pcm->card->sync_irq > 0) 593 synchronize_irq(substream->pcm->card->sync_irq); 594 } 595 } 596 597 /** 598 * snd_pcm_hw_params_choose - choose a configuration defined by @params 599 * @pcm: PCM instance 600 * @params: the hw_params instance 601 * 602 * Choose one configuration from configuration space defined by @params. 603 * The configuration chosen is that obtained fixing in this order: 604 * first access, first format, first subformat, min channels, 605 * min rate, min period time, max buffer size, min tick time 606 * 607 * Return: Zero if successful, or a negative error code on failure. 608 */ 609 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 610 struct snd_pcm_hw_params *params) 611 { 612 static const int vars[] = { 613 SNDRV_PCM_HW_PARAM_ACCESS, 614 SNDRV_PCM_HW_PARAM_FORMAT, 615 SNDRV_PCM_HW_PARAM_SUBFORMAT, 616 SNDRV_PCM_HW_PARAM_CHANNELS, 617 SNDRV_PCM_HW_PARAM_RATE, 618 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 619 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 620 SNDRV_PCM_HW_PARAM_TICK_TIME, 621 -1 622 }; 623 const int *v; 624 struct snd_mask old_mask; 625 struct snd_interval old_interval; 626 int changed; 627 628 for (v = vars; *v != -1; v++) { 629 /* Keep old parameter to trace. */ 630 if (trace_hw_mask_param_enabled()) { 631 if (hw_is_mask(*v)) 632 old_mask = *hw_param_mask(params, *v); 633 } 634 if (trace_hw_interval_param_enabled()) { 635 if (hw_is_interval(*v)) 636 old_interval = *hw_param_interval(params, *v); 637 } 638 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 639 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 640 else 641 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 642 if (changed < 0) 643 return changed; 644 if (changed == 0) 645 continue; 646 647 /* Trace the changed parameter. */ 648 if (hw_is_mask(*v)) { 649 trace_hw_mask_param(pcm, *v, 0, &old_mask, 650 hw_param_mask(params, *v)); 651 } 652 if (hw_is_interval(*v)) { 653 trace_hw_interval_param(pcm, *v, 0, &old_interval, 654 hw_param_interval(params, *v)); 655 } 656 } 657 658 return 0; 659 } 660 661 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 662 struct snd_pcm_hw_params *params) 663 { 664 struct snd_pcm_runtime *runtime; 665 int err, usecs; 666 unsigned int bits; 667 snd_pcm_uframes_t frames; 668 669 if (PCM_RUNTIME_CHECK(substream)) 670 return -ENXIO; 671 runtime = substream->runtime; 672 snd_pcm_stream_lock_irq(substream); 673 switch (runtime->status->state) { 674 case SNDRV_PCM_STATE_OPEN: 675 case SNDRV_PCM_STATE_SETUP: 676 case SNDRV_PCM_STATE_PREPARED: 677 break; 678 default: 679 snd_pcm_stream_unlock_irq(substream); 680 return -EBADFD; 681 } 682 snd_pcm_stream_unlock_irq(substream); 683 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 684 if (!substream->oss.oss) 685 #endif 686 if (atomic_read(&substream->mmap_count)) 687 return -EBADFD; 688 689 snd_pcm_sync_stop(substream, true); 690 691 params->rmask = ~0U; 692 err = snd_pcm_hw_refine(substream, params); 693 if (err < 0) 694 goto _error; 695 696 err = snd_pcm_hw_params_choose(substream, params); 697 if (err < 0) 698 goto _error; 699 700 err = fixup_unreferenced_params(substream, params); 701 if (err < 0) 702 goto _error; 703 704 if (substream->managed_buffer_alloc) { 705 err = snd_pcm_lib_malloc_pages(substream, 706 params_buffer_bytes(params)); 707 if (err < 0) 708 goto _error; 709 runtime->buffer_changed = err > 0; 710 } 711 712 if (substream->ops->hw_params != NULL) { 713 err = substream->ops->hw_params(substream, params); 714 if (err < 0) 715 goto _error; 716 } 717 718 runtime->access = params_access(params); 719 runtime->format = params_format(params); 720 runtime->subformat = params_subformat(params); 721 runtime->channels = params_channels(params); 722 runtime->rate = params_rate(params); 723 runtime->period_size = params_period_size(params); 724 runtime->periods = params_periods(params); 725 runtime->buffer_size = params_buffer_size(params); 726 runtime->info = params->info; 727 runtime->rate_num = params->rate_num; 728 runtime->rate_den = params->rate_den; 729 runtime->no_period_wakeup = 730 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 731 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 732 733 bits = snd_pcm_format_physical_width(runtime->format); 734 runtime->sample_bits = bits; 735 bits *= runtime->channels; 736 runtime->frame_bits = bits; 737 frames = 1; 738 while (bits % 8 != 0) { 739 bits *= 2; 740 frames *= 2; 741 } 742 runtime->byte_align = bits / 8; 743 runtime->min_align = frames; 744 745 /* Default sw params */ 746 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 747 runtime->period_step = 1; 748 runtime->control->avail_min = runtime->period_size; 749 runtime->start_threshold = 1; 750 runtime->stop_threshold = runtime->buffer_size; 751 runtime->silence_threshold = 0; 752 runtime->silence_size = 0; 753 runtime->boundary = runtime->buffer_size; 754 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 755 runtime->boundary *= 2; 756 757 /* clear the buffer for avoiding possible kernel info leaks */ 758 if (runtime->dma_area && !substream->ops->copy_user) { 759 size_t size = runtime->dma_bytes; 760 761 if (runtime->info & SNDRV_PCM_INFO_MMAP) 762 size = PAGE_ALIGN(size); 763 memset(runtime->dma_area, 0, size); 764 } 765 766 snd_pcm_timer_resolution_change(substream); 767 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 768 769 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 770 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 771 usecs = period_to_usecs(runtime); 772 if (usecs >= 0) 773 cpu_latency_qos_add_request(&substream->latency_pm_qos_req, 774 usecs); 775 return 0; 776 _error: 777 /* hardware might be unusable from this time, 778 so we force application to retry to set 779 the correct hardware parameter settings */ 780 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 781 if (substream->ops->hw_free != NULL) 782 substream->ops->hw_free(substream); 783 if (substream->managed_buffer_alloc) 784 snd_pcm_lib_free_pages(substream); 785 return err; 786 } 787 788 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 789 struct snd_pcm_hw_params __user * _params) 790 { 791 struct snd_pcm_hw_params *params; 792 int err; 793 794 params = memdup_user(_params, sizeof(*params)); 795 if (IS_ERR(params)) 796 return PTR_ERR(params); 797 798 err = snd_pcm_hw_params(substream, params); 799 if (err < 0) 800 goto end; 801 802 if (copy_to_user(_params, params, sizeof(*params))) 803 err = -EFAULT; 804 end: 805 kfree(params); 806 return err; 807 } 808 809 static int do_hw_free(struct snd_pcm_substream *substream) 810 { 811 int result = 0; 812 813 snd_pcm_sync_stop(substream, true); 814 if (substream->ops->hw_free) 815 result = substream->ops->hw_free(substream); 816 if (substream->managed_buffer_alloc) 817 snd_pcm_lib_free_pages(substream); 818 return result; 819 } 820 821 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 822 { 823 struct snd_pcm_runtime *runtime; 824 int result; 825 826 if (PCM_RUNTIME_CHECK(substream)) 827 return -ENXIO; 828 runtime = substream->runtime; 829 snd_pcm_stream_lock_irq(substream); 830 switch (runtime->status->state) { 831 case SNDRV_PCM_STATE_SETUP: 832 case SNDRV_PCM_STATE_PREPARED: 833 break; 834 default: 835 snd_pcm_stream_unlock_irq(substream); 836 return -EBADFD; 837 } 838 snd_pcm_stream_unlock_irq(substream); 839 if (atomic_read(&substream->mmap_count)) 840 return -EBADFD; 841 result = do_hw_free(substream); 842 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 843 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 844 return result; 845 } 846 847 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 848 struct snd_pcm_sw_params *params) 849 { 850 struct snd_pcm_runtime *runtime; 851 int err; 852 853 if (PCM_RUNTIME_CHECK(substream)) 854 return -ENXIO; 855 runtime = substream->runtime; 856 snd_pcm_stream_lock_irq(substream); 857 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 858 snd_pcm_stream_unlock_irq(substream); 859 return -EBADFD; 860 } 861 snd_pcm_stream_unlock_irq(substream); 862 863 if (params->tstamp_mode < 0 || 864 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 865 return -EINVAL; 866 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 867 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 868 return -EINVAL; 869 if (params->avail_min == 0) 870 return -EINVAL; 871 if (params->silence_size >= runtime->boundary) { 872 if (params->silence_threshold != 0) 873 return -EINVAL; 874 } else { 875 if (params->silence_size > params->silence_threshold) 876 return -EINVAL; 877 if (params->silence_threshold > runtime->buffer_size) 878 return -EINVAL; 879 } 880 err = 0; 881 snd_pcm_stream_lock_irq(substream); 882 runtime->tstamp_mode = params->tstamp_mode; 883 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 884 runtime->tstamp_type = params->tstamp_type; 885 runtime->period_step = params->period_step; 886 runtime->control->avail_min = params->avail_min; 887 runtime->start_threshold = params->start_threshold; 888 runtime->stop_threshold = params->stop_threshold; 889 runtime->silence_threshold = params->silence_threshold; 890 runtime->silence_size = params->silence_size; 891 params->boundary = runtime->boundary; 892 if (snd_pcm_running(substream)) { 893 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 894 runtime->silence_size > 0) 895 snd_pcm_playback_silence(substream, ULONG_MAX); 896 err = snd_pcm_update_state(substream, runtime); 897 } 898 snd_pcm_stream_unlock_irq(substream); 899 return err; 900 } 901 902 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 903 struct snd_pcm_sw_params __user * _params) 904 { 905 struct snd_pcm_sw_params params; 906 int err; 907 if (copy_from_user(¶ms, _params, sizeof(params))) 908 return -EFAULT; 909 err = snd_pcm_sw_params(substream, ¶ms); 910 if (copy_to_user(_params, ¶ms, sizeof(params))) 911 return -EFAULT; 912 return err; 913 } 914 915 static inline snd_pcm_uframes_t 916 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 917 { 918 snd_pcm_uframes_t delay; 919 920 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 921 delay = snd_pcm_playback_hw_avail(substream->runtime); 922 else 923 delay = snd_pcm_capture_avail(substream->runtime); 924 return delay + substream->runtime->delay; 925 } 926 927 int snd_pcm_status64(struct snd_pcm_substream *substream, 928 struct snd_pcm_status64 *status) 929 { 930 struct snd_pcm_runtime *runtime = substream->runtime; 931 932 snd_pcm_stream_lock_irq(substream); 933 934 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 935 &runtime->audio_tstamp_config); 936 937 /* backwards compatible behavior */ 938 if (runtime->audio_tstamp_config.type_requested == 939 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 940 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 941 runtime->audio_tstamp_config.type_requested = 942 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 943 else 944 runtime->audio_tstamp_config.type_requested = 945 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 946 runtime->audio_tstamp_report.valid = 0; 947 } else 948 runtime->audio_tstamp_report.valid = 1; 949 950 status->state = runtime->status->state; 951 status->suspended_state = runtime->status->suspended_state; 952 if (status->state == SNDRV_PCM_STATE_OPEN) 953 goto _end; 954 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec; 955 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec; 956 if (snd_pcm_running(substream)) { 957 snd_pcm_update_hw_ptr(substream); 958 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 959 status->tstamp_sec = runtime->status->tstamp.tv_sec; 960 status->tstamp_nsec = 961 runtime->status->tstamp.tv_nsec; 962 status->driver_tstamp_sec = 963 runtime->driver_tstamp.tv_sec; 964 status->driver_tstamp_nsec = 965 runtime->driver_tstamp.tv_nsec; 966 status->audio_tstamp_sec = 967 runtime->status->audio_tstamp.tv_sec; 968 status->audio_tstamp_nsec = 969 runtime->status->audio_tstamp.tv_nsec; 970 if (runtime->audio_tstamp_report.valid == 1) 971 /* backwards compatibility, no report provided in COMPAT mode */ 972 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 973 &status->audio_tstamp_accuracy, 974 &runtime->audio_tstamp_report); 975 976 goto _tstamp_end; 977 } 978 } else { 979 /* get tstamp only in fallback mode and only if enabled */ 980 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 981 struct timespec64 tstamp; 982 983 snd_pcm_gettime(runtime, &tstamp); 984 status->tstamp_sec = tstamp.tv_sec; 985 status->tstamp_nsec = tstamp.tv_nsec; 986 } 987 } 988 _tstamp_end: 989 status->appl_ptr = runtime->control->appl_ptr; 990 status->hw_ptr = runtime->status->hw_ptr; 991 status->avail = snd_pcm_avail(substream); 992 status->delay = snd_pcm_running(substream) ? 993 snd_pcm_calc_delay(substream) : 0; 994 status->avail_max = runtime->avail_max; 995 status->overrange = runtime->overrange; 996 runtime->avail_max = 0; 997 runtime->overrange = 0; 998 _end: 999 snd_pcm_stream_unlock_irq(substream); 1000 return 0; 1001 } 1002 1003 static int snd_pcm_status_user64(struct snd_pcm_substream *substream, 1004 struct snd_pcm_status64 __user * _status, 1005 bool ext) 1006 { 1007 struct snd_pcm_status64 status; 1008 int res; 1009 1010 memset(&status, 0, sizeof(status)); 1011 /* 1012 * with extension, parameters are read/write, 1013 * get audio_tstamp_data from user, 1014 * ignore rest of status structure 1015 */ 1016 if (ext && get_user(status.audio_tstamp_data, 1017 (u32 __user *)(&_status->audio_tstamp_data))) 1018 return -EFAULT; 1019 res = snd_pcm_status64(substream, &status); 1020 if (res < 0) 1021 return res; 1022 if (copy_to_user(_status, &status, sizeof(status))) 1023 return -EFAULT; 1024 return 0; 1025 } 1026 1027 static int snd_pcm_status_user32(struct snd_pcm_substream *substream, 1028 struct snd_pcm_status32 __user * _status, 1029 bool ext) 1030 { 1031 struct snd_pcm_status64 status64; 1032 struct snd_pcm_status32 status32; 1033 int res; 1034 1035 memset(&status64, 0, sizeof(status64)); 1036 memset(&status32, 0, sizeof(status32)); 1037 /* 1038 * with extension, parameters are read/write, 1039 * get audio_tstamp_data from user, 1040 * ignore rest of status structure 1041 */ 1042 if (ext && get_user(status64.audio_tstamp_data, 1043 (u32 __user *)(&_status->audio_tstamp_data))) 1044 return -EFAULT; 1045 res = snd_pcm_status64(substream, &status64); 1046 if (res < 0) 1047 return res; 1048 1049 status32 = (struct snd_pcm_status32) { 1050 .state = status64.state, 1051 .trigger_tstamp_sec = status64.trigger_tstamp_sec, 1052 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec, 1053 .tstamp_sec = status64.tstamp_sec, 1054 .tstamp_nsec = status64.tstamp_nsec, 1055 .appl_ptr = status64.appl_ptr, 1056 .hw_ptr = status64.hw_ptr, 1057 .delay = status64.delay, 1058 .avail = status64.avail, 1059 .avail_max = status64.avail_max, 1060 .overrange = status64.overrange, 1061 .suspended_state = status64.suspended_state, 1062 .audio_tstamp_data = status64.audio_tstamp_data, 1063 .audio_tstamp_sec = status64.audio_tstamp_sec, 1064 .audio_tstamp_nsec = status64.audio_tstamp_nsec, 1065 .driver_tstamp_sec = status64.audio_tstamp_sec, 1066 .driver_tstamp_nsec = status64.audio_tstamp_nsec, 1067 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy, 1068 }; 1069 1070 if (copy_to_user(_status, &status32, sizeof(status32))) 1071 return -EFAULT; 1072 1073 return 0; 1074 } 1075 1076 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 1077 struct snd_pcm_channel_info * info) 1078 { 1079 struct snd_pcm_runtime *runtime; 1080 unsigned int channel; 1081 1082 channel = info->channel; 1083 runtime = substream->runtime; 1084 snd_pcm_stream_lock_irq(substream); 1085 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 1086 snd_pcm_stream_unlock_irq(substream); 1087 return -EBADFD; 1088 } 1089 snd_pcm_stream_unlock_irq(substream); 1090 if (channel >= runtime->channels) 1091 return -EINVAL; 1092 memset(info, 0, sizeof(*info)); 1093 info->channel = channel; 1094 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1095 } 1096 1097 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1098 struct snd_pcm_channel_info __user * _info) 1099 { 1100 struct snd_pcm_channel_info info; 1101 int res; 1102 1103 if (copy_from_user(&info, _info, sizeof(info))) 1104 return -EFAULT; 1105 res = snd_pcm_channel_info(substream, &info); 1106 if (res < 0) 1107 return res; 1108 if (copy_to_user(_info, &info, sizeof(info))) 1109 return -EFAULT; 1110 return 0; 1111 } 1112 1113 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1114 { 1115 struct snd_pcm_runtime *runtime = substream->runtime; 1116 if (runtime->trigger_master == NULL) 1117 return; 1118 if (runtime->trigger_master == substream) { 1119 if (!runtime->trigger_tstamp_latched) 1120 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1121 } else { 1122 snd_pcm_trigger_tstamp(runtime->trigger_master); 1123 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1124 } 1125 runtime->trigger_master = NULL; 1126 } 1127 1128 #define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0 1129 1130 struct action_ops { 1131 int (*pre_action)(struct snd_pcm_substream *substream, 1132 snd_pcm_state_t state); 1133 int (*do_action)(struct snd_pcm_substream *substream, 1134 snd_pcm_state_t state); 1135 void (*undo_action)(struct snd_pcm_substream *substream, 1136 snd_pcm_state_t state); 1137 void (*post_action)(struct snd_pcm_substream *substream, 1138 snd_pcm_state_t state); 1139 }; 1140 1141 /* 1142 * this functions is core for handling of linked stream 1143 * Note: the stream state might be changed also on failure 1144 * Note2: call with calling stream lock + link lock 1145 */ 1146 static int snd_pcm_action_group(const struct action_ops *ops, 1147 struct snd_pcm_substream *substream, 1148 snd_pcm_state_t state, 1149 bool do_lock) 1150 { 1151 struct snd_pcm_substream *s = NULL; 1152 struct snd_pcm_substream *s1; 1153 int res = 0, depth = 1; 1154 1155 snd_pcm_group_for_each_entry(s, substream) { 1156 if (do_lock && s != substream) { 1157 if (s->pcm->nonatomic) 1158 mutex_lock_nested(&s->self_group.mutex, depth); 1159 else 1160 spin_lock_nested(&s->self_group.lock, depth); 1161 depth++; 1162 } 1163 res = ops->pre_action(s, state); 1164 if (res < 0) 1165 goto _unlock; 1166 } 1167 snd_pcm_group_for_each_entry(s, substream) { 1168 res = ops->do_action(s, state); 1169 if (res < 0) { 1170 if (ops->undo_action) { 1171 snd_pcm_group_for_each_entry(s1, substream) { 1172 if (s1 == s) /* failed stream */ 1173 break; 1174 ops->undo_action(s1, state); 1175 } 1176 } 1177 s = NULL; /* unlock all */ 1178 goto _unlock; 1179 } 1180 } 1181 snd_pcm_group_for_each_entry(s, substream) { 1182 ops->post_action(s, state); 1183 } 1184 _unlock: 1185 if (do_lock) { 1186 /* unlock streams */ 1187 snd_pcm_group_for_each_entry(s1, substream) { 1188 if (s1 != substream) { 1189 if (s1->pcm->nonatomic) 1190 mutex_unlock(&s1->self_group.mutex); 1191 else 1192 spin_unlock(&s1->self_group.lock); 1193 } 1194 if (s1 == s) /* end */ 1195 break; 1196 } 1197 } 1198 return res; 1199 } 1200 1201 /* 1202 * Note: call with stream lock 1203 */ 1204 static int snd_pcm_action_single(const struct action_ops *ops, 1205 struct snd_pcm_substream *substream, 1206 snd_pcm_state_t state) 1207 { 1208 int res; 1209 1210 res = ops->pre_action(substream, state); 1211 if (res < 0) 1212 return res; 1213 res = ops->do_action(substream, state); 1214 if (res == 0) 1215 ops->post_action(substream, state); 1216 else if (ops->undo_action) 1217 ops->undo_action(substream, state); 1218 return res; 1219 } 1220 1221 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1222 struct snd_pcm_group *new_group) 1223 { 1224 substream->group = new_group; 1225 list_move(&substream->link_list, &new_group->substreams); 1226 } 1227 1228 /* 1229 * Unref and unlock the group, but keep the stream lock; 1230 * when the group becomes empty and no longer referred, destroy itself 1231 */ 1232 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1233 struct snd_pcm_substream *substream) 1234 { 1235 bool do_free; 1236 1237 if (!group) 1238 return; 1239 do_free = refcount_dec_and_test(&group->refs); 1240 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1241 if (do_free) 1242 kfree(group); 1243 } 1244 1245 /* 1246 * Lock the group inside a stream lock and reference it; 1247 * return the locked group object, or NULL if not linked 1248 */ 1249 static struct snd_pcm_group * 1250 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1251 { 1252 bool nonatomic = substream->pcm->nonatomic; 1253 struct snd_pcm_group *group; 1254 bool trylock; 1255 1256 for (;;) { 1257 if (!snd_pcm_stream_linked(substream)) 1258 return NULL; 1259 group = substream->group; 1260 /* block freeing the group object */ 1261 refcount_inc(&group->refs); 1262 1263 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1264 spin_trylock(&group->lock); 1265 if (trylock) 1266 break; /* OK */ 1267 1268 /* re-lock for avoiding ABBA deadlock */ 1269 snd_pcm_stream_unlock(substream); 1270 snd_pcm_group_lock(group, nonatomic); 1271 snd_pcm_stream_lock(substream); 1272 1273 /* check the group again; the above opens a small race window */ 1274 if (substream->group == group) 1275 break; /* OK */ 1276 /* group changed, try again */ 1277 snd_pcm_group_unref(group, substream); 1278 } 1279 return group; 1280 } 1281 1282 /* 1283 * Note: call with stream lock 1284 */ 1285 static int snd_pcm_action(const struct action_ops *ops, 1286 struct snd_pcm_substream *substream, 1287 snd_pcm_state_t state) 1288 { 1289 struct snd_pcm_group *group; 1290 int res; 1291 1292 group = snd_pcm_stream_group_ref(substream); 1293 if (group) 1294 res = snd_pcm_action_group(ops, substream, state, true); 1295 else 1296 res = snd_pcm_action_single(ops, substream, state); 1297 snd_pcm_group_unref(group, substream); 1298 return res; 1299 } 1300 1301 /* 1302 * Note: don't use any locks before 1303 */ 1304 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1305 struct snd_pcm_substream *substream, 1306 snd_pcm_state_t state) 1307 { 1308 int res; 1309 1310 snd_pcm_stream_lock_irq(substream); 1311 res = snd_pcm_action(ops, substream, state); 1312 snd_pcm_stream_unlock_irq(substream); 1313 return res; 1314 } 1315 1316 /* 1317 */ 1318 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1319 struct snd_pcm_substream *substream, 1320 snd_pcm_state_t state) 1321 { 1322 int res; 1323 1324 /* Guarantee the group members won't change during non-atomic action */ 1325 down_read(&snd_pcm_link_rwsem); 1326 if (snd_pcm_stream_linked(substream)) 1327 res = snd_pcm_action_group(ops, substream, state, false); 1328 else 1329 res = snd_pcm_action_single(ops, substream, state); 1330 up_read(&snd_pcm_link_rwsem); 1331 return res; 1332 } 1333 1334 /* 1335 * start callbacks 1336 */ 1337 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, 1338 snd_pcm_state_t state) 1339 { 1340 struct snd_pcm_runtime *runtime = substream->runtime; 1341 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1342 return -EBADFD; 1343 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1344 !snd_pcm_playback_data(substream)) 1345 return -EPIPE; 1346 runtime->trigger_tstamp_latched = false; 1347 runtime->trigger_master = substream; 1348 return 0; 1349 } 1350 1351 static int snd_pcm_do_start(struct snd_pcm_substream *substream, 1352 snd_pcm_state_t state) 1353 { 1354 if (substream->runtime->trigger_master != substream) 1355 return 0; 1356 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1357 } 1358 1359 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, 1360 snd_pcm_state_t state) 1361 { 1362 if (substream->runtime->trigger_master == substream) 1363 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1364 } 1365 1366 static void snd_pcm_post_start(struct snd_pcm_substream *substream, 1367 snd_pcm_state_t state) 1368 { 1369 struct snd_pcm_runtime *runtime = substream->runtime; 1370 snd_pcm_trigger_tstamp(substream); 1371 runtime->hw_ptr_jiffies = jiffies; 1372 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1373 runtime->rate; 1374 runtime->status->state = state; 1375 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1376 runtime->silence_size > 0) 1377 snd_pcm_playback_silence(substream, ULONG_MAX); 1378 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1379 } 1380 1381 static const struct action_ops snd_pcm_action_start = { 1382 .pre_action = snd_pcm_pre_start, 1383 .do_action = snd_pcm_do_start, 1384 .undo_action = snd_pcm_undo_start, 1385 .post_action = snd_pcm_post_start 1386 }; 1387 1388 /** 1389 * snd_pcm_start - start all linked streams 1390 * @substream: the PCM substream instance 1391 * 1392 * Return: Zero if successful, or a negative error code. 1393 * The stream lock must be acquired before calling this function. 1394 */ 1395 int snd_pcm_start(struct snd_pcm_substream *substream) 1396 { 1397 return snd_pcm_action(&snd_pcm_action_start, substream, 1398 SNDRV_PCM_STATE_RUNNING); 1399 } 1400 1401 /* take the stream lock and start the streams */ 1402 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1403 { 1404 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1405 SNDRV_PCM_STATE_RUNNING); 1406 } 1407 1408 /* 1409 * stop callbacks 1410 */ 1411 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, 1412 snd_pcm_state_t state) 1413 { 1414 struct snd_pcm_runtime *runtime = substream->runtime; 1415 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1416 return -EBADFD; 1417 runtime->trigger_master = substream; 1418 return 0; 1419 } 1420 1421 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, 1422 snd_pcm_state_t state) 1423 { 1424 if (substream->runtime->trigger_master == substream && 1425 snd_pcm_running(substream)) { 1426 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1427 substream->runtime->stop_operating = true; 1428 } 1429 return 0; /* unconditionally stop all substreams */ 1430 } 1431 1432 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, 1433 snd_pcm_state_t state) 1434 { 1435 struct snd_pcm_runtime *runtime = substream->runtime; 1436 if (runtime->status->state != state) { 1437 snd_pcm_trigger_tstamp(substream); 1438 runtime->status->state = state; 1439 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1440 } 1441 wake_up(&runtime->sleep); 1442 wake_up(&runtime->tsleep); 1443 } 1444 1445 static const struct action_ops snd_pcm_action_stop = { 1446 .pre_action = snd_pcm_pre_stop, 1447 .do_action = snd_pcm_do_stop, 1448 .post_action = snd_pcm_post_stop 1449 }; 1450 1451 /** 1452 * snd_pcm_stop - try to stop all running streams in the substream group 1453 * @substream: the PCM substream instance 1454 * @state: PCM state after stopping the stream 1455 * 1456 * The state of each stream is then changed to the given state unconditionally. 1457 * 1458 * Return: Zero if successful, or a negative error code. 1459 */ 1460 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1461 { 1462 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1463 } 1464 EXPORT_SYMBOL(snd_pcm_stop); 1465 1466 /** 1467 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1468 * @substream: the PCM substream 1469 * 1470 * After stopping, the state is changed to SETUP. 1471 * Unlike snd_pcm_stop(), this affects only the given stream. 1472 * 1473 * Return: Zero if successful, or a negative error code. 1474 */ 1475 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1476 { 1477 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1478 SNDRV_PCM_STATE_SETUP); 1479 } 1480 1481 /** 1482 * snd_pcm_stop_xrun - stop the running streams as XRUN 1483 * @substream: the PCM substream instance 1484 * 1485 * This stops the given running substream (and all linked substreams) as XRUN. 1486 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1487 * 1488 * Return: Zero if successful, or a negative error code. 1489 */ 1490 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1491 { 1492 unsigned long flags; 1493 1494 snd_pcm_stream_lock_irqsave(substream, flags); 1495 if (substream->runtime && snd_pcm_running(substream)) 1496 __snd_pcm_xrun(substream); 1497 snd_pcm_stream_unlock_irqrestore(substream, flags); 1498 return 0; 1499 } 1500 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1501 1502 /* 1503 * pause callbacks: pass boolean (to start pause or resume) as state argument 1504 */ 1505 #define pause_pushed(state) (__force bool)(state) 1506 1507 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, 1508 snd_pcm_state_t state) 1509 { 1510 struct snd_pcm_runtime *runtime = substream->runtime; 1511 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1512 return -ENOSYS; 1513 if (pause_pushed(state)) { 1514 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1515 return -EBADFD; 1516 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1517 return -EBADFD; 1518 runtime->trigger_master = substream; 1519 return 0; 1520 } 1521 1522 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, 1523 snd_pcm_state_t state) 1524 { 1525 if (substream->runtime->trigger_master != substream) 1526 return 0; 1527 /* some drivers might use hw_ptr to recover from the pause - 1528 update the hw_ptr now */ 1529 if (pause_pushed(state)) 1530 snd_pcm_update_hw_ptr(substream); 1531 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1532 * a delta between the current jiffies, this gives a large enough 1533 * delta, effectively to skip the check once. 1534 */ 1535 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1536 return substream->ops->trigger(substream, 1537 pause_pushed(state) ? 1538 SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1539 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1540 } 1541 1542 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, 1543 snd_pcm_state_t state) 1544 { 1545 if (substream->runtime->trigger_master == substream) 1546 substream->ops->trigger(substream, 1547 pause_pushed(state) ? 1548 SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1549 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1550 } 1551 1552 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, 1553 snd_pcm_state_t state) 1554 { 1555 struct snd_pcm_runtime *runtime = substream->runtime; 1556 snd_pcm_trigger_tstamp(substream); 1557 if (pause_pushed(state)) { 1558 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1559 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1560 wake_up(&runtime->sleep); 1561 wake_up(&runtime->tsleep); 1562 } else { 1563 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1564 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1565 } 1566 } 1567 1568 static const struct action_ops snd_pcm_action_pause = { 1569 .pre_action = snd_pcm_pre_pause, 1570 .do_action = snd_pcm_do_pause, 1571 .undo_action = snd_pcm_undo_pause, 1572 .post_action = snd_pcm_post_pause 1573 }; 1574 1575 /* 1576 * Push/release the pause for all linked streams. 1577 */ 1578 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push) 1579 { 1580 return snd_pcm_action(&snd_pcm_action_pause, substream, 1581 (__force snd_pcm_state_t)push); 1582 } 1583 1584 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream, 1585 bool push) 1586 { 1587 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream, 1588 (__force snd_pcm_state_t)push); 1589 } 1590 1591 #ifdef CONFIG_PM 1592 /* suspend callback: state argument ignored */ 1593 1594 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, 1595 snd_pcm_state_t state) 1596 { 1597 struct snd_pcm_runtime *runtime = substream->runtime; 1598 switch (runtime->status->state) { 1599 case SNDRV_PCM_STATE_SUSPENDED: 1600 return -EBUSY; 1601 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1602 case SNDRV_PCM_STATE_OPEN: 1603 case SNDRV_PCM_STATE_SETUP: 1604 case SNDRV_PCM_STATE_DISCONNECTED: 1605 return -EBUSY; 1606 } 1607 runtime->trigger_master = substream; 1608 return 0; 1609 } 1610 1611 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, 1612 snd_pcm_state_t state) 1613 { 1614 struct snd_pcm_runtime *runtime = substream->runtime; 1615 if (runtime->trigger_master != substream) 1616 return 0; 1617 if (! snd_pcm_running(substream)) 1618 return 0; 1619 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1620 runtime->stop_operating = true; 1621 return 0; /* suspend unconditionally */ 1622 } 1623 1624 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, 1625 snd_pcm_state_t state) 1626 { 1627 struct snd_pcm_runtime *runtime = substream->runtime; 1628 snd_pcm_trigger_tstamp(substream); 1629 runtime->status->suspended_state = runtime->status->state; 1630 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1631 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1632 wake_up(&runtime->sleep); 1633 wake_up(&runtime->tsleep); 1634 } 1635 1636 static const struct action_ops snd_pcm_action_suspend = { 1637 .pre_action = snd_pcm_pre_suspend, 1638 .do_action = snd_pcm_do_suspend, 1639 .post_action = snd_pcm_post_suspend 1640 }; 1641 1642 /* 1643 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1644 * @substream: the PCM substream 1645 * 1646 * After this call, all streams are changed to SUSPENDED state. 1647 * 1648 * Return: Zero if successful, or a negative error code. 1649 */ 1650 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1651 { 1652 int err; 1653 unsigned long flags; 1654 1655 snd_pcm_stream_lock_irqsave(substream, flags); 1656 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 1657 ACTION_ARG_IGNORE); 1658 snd_pcm_stream_unlock_irqrestore(substream, flags); 1659 return err; 1660 } 1661 1662 /** 1663 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1664 * @pcm: the PCM instance 1665 * 1666 * After this call, all streams are changed to SUSPENDED state. 1667 * 1668 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1669 */ 1670 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1671 { 1672 struct snd_pcm_substream *substream; 1673 int stream, err = 0; 1674 1675 if (! pcm) 1676 return 0; 1677 1678 for_each_pcm_substream(pcm, stream, substream) { 1679 /* FIXME: the open/close code should lock this as well */ 1680 if (!substream->runtime) 1681 continue; 1682 1683 /* 1684 * Skip BE dai link PCM's that are internal and may 1685 * not have their substream ops set. 1686 */ 1687 if (!substream->ops) 1688 continue; 1689 1690 err = snd_pcm_suspend(substream); 1691 if (err < 0 && err != -EBUSY) 1692 return err; 1693 } 1694 1695 for_each_pcm_substream(pcm, stream, substream) 1696 snd_pcm_sync_stop(substream, false); 1697 1698 return 0; 1699 } 1700 EXPORT_SYMBOL(snd_pcm_suspend_all); 1701 1702 /* resume callbacks: state argument ignored */ 1703 1704 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, 1705 snd_pcm_state_t state) 1706 { 1707 struct snd_pcm_runtime *runtime = substream->runtime; 1708 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1709 return -ENOSYS; 1710 runtime->trigger_master = substream; 1711 return 0; 1712 } 1713 1714 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, 1715 snd_pcm_state_t state) 1716 { 1717 struct snd_pcm_runtime *runtime = substream->runtime; 1718 if (runtime->trigger_master != substream) 1719 return 0; 1720 /* DMA not running previously? */ 1721 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1722 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1723 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1724 return 0; 1725 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1726 } 1727 1728 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, 1729 snd_pcm_state_t state) 1730 { 1731 if (substream->runtime->trigger_master == substream && 1732 snd_pcm_running(substream)) 1733 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1734 } 1735 1736 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, 1737 snd_pcm_state_t state) 1738 { 1739 struct snd_pcm_runtime *runtime = substream->runtime; 1740 snd_pcm_trigger_tstamp(substream); 1741 runtime->status->state = runtime->status->suspended_state; 1742 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1743 } 1744 1745 static const struct action_ops snd_pcm_action_resume = { 1746 .pre_action = snd_pcm_pre_resume, 1747 .do_action = snd_pcm_do_resume, 1748 .undo_action = snd_pcm_undo_resume, 1749 .post_action = snd_pcm_post_resume 1750 }; 1751 1752 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1753 { 1754 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 1755 ACTION_ARG_IGNORE); 1756 } 1757 1758 #else 1759 1760 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1761 { 1762 return -ENOSYS; 1763 } 1764 1765 #endif /* CONFIG_PM */ 1766 1767 /* 1768 * xrun ioctl 1769 * 1770 * Change the RUNNING stream(s) to XRUN state. 1771 */ 1772 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1773 { 1774 struct snd_pcm_runtime *runtime = substream->runtime; 1775 int result; 1776 1777 snd_pcm_stream_lock_irq(substream); 1778 switch (runtime->status->state) { 1779 case SNDRV_PCM_STATE_XRUN: 1780 result = 0; /* already there */ 1781 break; 1782 case SNDRV_PCM_STATE_RUNNING: 1783 __snd_pcm_xrun(substream); 1784 result = 0; 1785 break; 1786 default: 1787 result = -EBADFD; 1788 } 1789 snd_pcm_stream_unlock_irq(substream); 1790 return result; 1791 } 1792 1793 /* 1794 * reset ioctl 1795 */ 1796 /* reset callbacks: state argument ignored */ 1797 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, 1798 snd_pcm_state_t state) 1799 { 1800 struct snd_pcm_runtime *runtime = substream->runtime; 1801 switch (runtime->status->state) { 1802 case SNDRV_PCM_STATE_RUNNING: 1803 case SNDRV_PCM_STATE_PREPARED: 1804 case SNDRV_PCM_STATE_PAUSED: 1805 case SNDRV_PCM_STATE_SUSPENDED: 1806 return 0; 1807 default: 1808 return -EBADFD; 1809 } 1810 } 1811 1812 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, 1813 snd_pcm_state_t state) 1814 { 1815 struct snd_pcm_runtime *runtime = substream->runtime; 1816 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1817 if (err < 0) 1818 return err; 1819 runtime->hw_ptr_base = 0; 1820 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1821 runtime->status->hw_ptr % runtime->period_size; 1822 runtime->silence_start = runtime->status->hw_ptr; 1823 runtime->silence_filled = 0; 1824 return 0; 1825 } 1826 1827 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, 1828 snd_pcm_state_t state) 1829 { 1830 struct snd_pcm_runtime *runtime = substream->runtime; 1831 runtime->control->appl_ptr = runtime->status->hw_ptr; 1832 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1833 runtime->silence_size > 0) 1834 snd_pcm_playback_silence(substream, ULONG_MAX); 1835 } 1836 1837 static const struct action_ops snd_pcm_action_reset = { 1838 .pre_action = snd_pcm_pre_reset, 1839 .do_action = snd_pcm_do_reset, 1840 .post_action = snd_pcm_post_reset 1841 }; 1842 1843 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1844 { 1845 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 1846 ACTION_ARG_IGNORE); 1847 } 1848 1849 /* 1850 * prepare ioctl 1851 */ 1852 /* pass f_flags as state argument */ 1853 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1854 snd_pcm_state_t state) 1855 { 1856 struct snd_pcm_runtime *runtime = substream->runtime; 1857 int f_flags = (__force int)state; 1858 1859 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1860 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1861 return -EBADFD; 1862 if (snd_pcm_running(substream)) 1863 return -EBUSY; 1864 substream->f_flags = f_flags; 1865 return 0; 1866 } 1867 1868 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, 1869 snd_pcm_state_t state) 1870 { 1871 int err; 1872 snd_pcm_sync_stop(substream, true); 1873 err = substream->ops->prepare(substream); 1874 if (err < 0) 1875 return err; 1876 return snd_pcm_do_reset(substream, state); 1877 } 1878 1879 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, 1880 snd_pcm_state_t state) 1881 { 1882 struct snd_pcm_runtime *runtime = substream->runtime; 1883 runtime->control->appl_ptr = runtime->status->hw_ptr; 1884 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1885 } 1886 1887 static const struct action_ops snd_pcm_action_prepare = { 1888 .pre_action = snd_pcm_pre_prepare, 1889 .do_action = snd_pcm_do_prepare, 1890 .post_action = snd_pcm_post_prepare 1891 }; 1892 1893 /** 1894 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1895 * @substream: the PCM substream instance 1896 * @file: file to refer f_flags 1897 * 1898 * Return: Zero if successful, or a negative error code. 1899 */ 1900 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1901 struct file *file) 1902 { 1903 int f_flags; 1904 1905 if (file) 1906 f_flags = file->f_flags; 1907 else 1908 f_flags = substream->f_flags; 1909 1910 snd_pcm_stream_lock_irq(substream); 1911 switch (substream->runtime->status->state) { 1912 case SNDRV_PCM_STATE_PAUSED: 1913 snd_pcm_pause(substream, false); 1914 fallthrough; 1915 case SNDRV_PCM_STATE_SUSPENDED: 1916 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1917 break; 1918 } 1919 snd_pcm_stream_unlock_irq(substream); 1920 1921 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1922 substream, 1923 (__force snd_pcm_state_t)f_flags); 1924 } 1925 1926 /* 1927 * drain ioctl 1928 */ 1929 1930 /* drain init callbacks: state argument ignored */ 1931 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, 1932 snd_pcm_state_t state) 1933 { 1934 struct snd_pcm_runtime *runtime = substream->runtime; 1935 switch (runtime->status->state) { 1936 case SNDRV_PCM_STATE_OPEN: 1937 case SNDRV_PCM_STATE_DISCONNECTED: 1938 case SNDRV_PCM_STATE_SUSPENDED: 1939 return -EBADFD; 1940 } 1941 runtime->trigger_master = substream; 1942 return 0; 1943 } 1944 1945 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, 1946 snd_pcm_state_t state) 1947 { 1948 struct snd_pcm_runtime *runtime = substream->runtime; 1949 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1950 switch (runtime->status->state) { 1951 case SNDRV_PCM_STATE_PREPARED: 1952 /* start playback stream if possible */ 1953 if (! snd_pcm_playback_empty(substream)) { 1954 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1955 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1956 } else { 1957 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1958 } 1959 break; 1960 case SNDRV_PCM_STATE_RUNNING: 1961 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1962 break; 1963 case SNDRV_PCM_STATE_XRUN: 1964 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1965 break; 1966 default: 1967 break; 1968 } 1969 } else { 1970 /* stop running stream */ 1971 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1972 snd_pcm_state_t new_state; 1973 1974 new_state = snd_pcm_capture_avail(runtime) > 0 ? 1975 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1976 snd_pcm_do_stop(substream, new_state); 1977 snd_pcm_post_stop(substream, new_state); 1978 } 1979 } 1980 1981 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1982 runtime->trigger_master == substream && 1983 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1984 return substream->ops->trigger(substream, 1985 SNDRV_PCM_TRIGGER_DRAIN); 1986 1987 return 0; 1988 } 1989 1990 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, 1991 snd_pcm_state_t state) 1992 { 1993 } 1994 1995 static const struct action_ops snd_pcm_action_drain_init = { 1996 .pre_action = snd_pcm_pre_drain_init, 1997 .do_action = snd_pcm_do_drain_init, 1998 .post_action = snd_pcm_post_drain_init 1999 }; 2000 2001 /* 2002 * Drain the stream(s). 2003 * When the substream is linked, sync until the draining of all playback streams 2004 * is finished. 2005 * After this call, all streams are supposed to be either SETUP or DRAINING 2006 * (capture only) state. 2007 */ 2008 static int snd_pcm_drain(struct snd_pcm_substream *substream, 2009 struct file *file) 2010 { 2011 struct snd_card *card; 2012 struct snd_pcm_runtime *runtime; 2013 struct snd_pcm_substream *s; 2014 struct snd_pcm_group *group; 2015 wait_queue_entry_t wait; 2016 int result = 0; 2017 int nonblock = 0; 2018 2019 card = substream->pcm->card; 2020 runtime = substream->runtime; 2021 2022 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2023 return -EBADFD; 2024 2025 if (file) { 2026 if (file->f_flags & O_NONBLOCK) 2027 nonblock = 1; 2028 } else if (substream->f_flags & O_NONBLOCK) 2029 nonblock = 1; 2030 2031 snd_pcm_stream_lock_irq(substream); 2032 /* resume pause */ 2033 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 2034 snd_pcm_pause(substream, false); 2035 2036 /* pre-start/stop - all running streams are changed to DRAINING state */ 2037 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 2038 ACTION_ARG_IGNORE); 2039 if (result < 0) 2040 goto unlock; 2041 /* in non-blocking, we don't wait in ioctl but let caller poll */ 2042 if (nonblock) { 2043 result = -EAGAIN; 2044 goto unlock; 2045 } 2046 2047 for (;;) { 2048 long tout; 2049 struct snd_pcm_runtime *to_check; 2050 if (signal_pending(current)) { 2051 result = -ERESTARTSYS; 2052 break; 2053 } 2054 /* find a substream to drain */ 2055 to_check = NULL; 2056 group = snd_pcm_stream_group_ref(substream); 2057 snd_pcm_group_for_each_entry(s, substream) { 2058 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 2059 continue; 2060 runtime = s->runtime; 2061 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 2062 to_check = runtime; 2063 break; 2064 } 2065 } 2066 snd_pcm_group_unref(group, substream); 2067 if (!to_check) 2068 break; /* all drained */ 2069 init_waitqueue_entry(&wait, current); 2070 set_current_state(TASK_INTERRUPTIBLE); 2071 add_wait_queue(&to_check->sleep, &wait); 2072 snd_pcm_stream_unlock_irq(substream); 2073 if (runtime->no_period_wakeup) 2074 tout = MAX_SCHEDULE_TIMEOUT; 2075 else { 2076 tout = 10; 2077 if (runtime->rate) { 2078 long t = runtime->period_size * 2 / runtime->rate; 2079 tout = max(t, tout); 2080 } 2081 tout = msecs_to_jiffies(tout * 1000); 2082 } 2083 tout = schedule_timeout(tout); 2084 2085 snd_pcm_stream_lock_irq(substream); 2086 group = snd_pcm_stream_group_ref(substream); 2087 snd_pcm_group_for_each_entry(s, substream) { 2088 if (s->runtime == to_check) { 2089 remove_wait_queue(&to_check->sleep, &wait); 2090 break; 2091 } 2092 } 2093 snd_pcm_group_unref(group, substream); 2094 2095 if (card->shutdown) { 2096 result = -ENODEV; 2097 break; 2098 } 2099 if (tout == 0) { 2100 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 2101 result = -ESTRPIPE; 2102 else { 2103 dev_dbg(substream->pcm->card->dev, 2104 "playback drain error (DMA or IRQ trouble?)\n"); 2105 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2106 result = -EIO; 2107 } 2108 break; 2109 } 2110 } 2111 2112 unlock: 2113 snd_pcm_stream_unlock_irq(substream); 2114 2115 return result; 2116 } 2117 2118 /* 2119 * drop ioctl 2120 * 2121 * Immediately put all linked substreams into SETUP state. 2122 */ 2123 static int snd_pcm_drop(struct snd_pcm_substream *substream) 2124 { 2125 struct snd_pcm_runtime *runtime; 2126 int result = 0; 2127 2128 if (PCM_RUNTIME_CHECK(substream)) 2129 return -ENXIO; 2130 runtime = substream->runtime; 2131 2132 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 2133 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 2134 return -EBADFD; 2135 2136 snd_pcm_stream_lock_irq(substream); 2137 /* resume pause */ 2138 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 2139 snd_pcm_pause(substream, false); 2140 2141 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2142 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 2143 snd_pcm_stream_unlock_irq(substream); 2144 2145 return result; 2146 } 2147 2148 2149 static bool is_pcm_file(struct file *file) 2150 { 2151 struct inode *inode = file_inode(file); 2152 struct snd_pcm *pcm; 2153 unsigned int minor; 2154 2155 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2156 return false; 2157 minor = iminor(inode); 2158 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2159 if (!pcm) 2160 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2161 if (!pcm) 2162 return false; 2163 snd_card_unref(pcm->card); 2164 return true; 2165 } 2166 2167 /* 2168 * PCM link handling 2169 */ 2170 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2171 { 2172 int res = 0; 2173 struct snd_pcm_file *pcm_file; 2174 struct snd_pcm_substream *substream1; 2175 struct snd_pcm_group *group, *target_group; 2176 bool nonatomic = substream->pcm->nonatomic; 2177 struct fd f = fdget(fd); 2178 2179 if (!f.file) 2180 return -EBADFD; 2181 if (!is_pcm_file(f.file)) { 2182 res = -EBADFD; 2183 goto _badf; 2184 } 2185 pcm_file = f.file->private_data; 2186 substream1 = pcm_file->substream; 2187 2188 if (substream == substream1) { 2189 res = -EINVAL; 2190 goto _badf; 2191 } 2192 2193 group = kzalloc(sizeof(*group), GFP_KERNEL); 2194 if (!group) { 2195 res = -ENOMEM; 2196 goto _nolock; 2197 } 2198 snd_pcm_group_init(group); 2199 2200 down_write(&snd_pcm_link_rwsem); 2201 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2202 substream->runtime->status->state != substream1->runtime->status->state || 2203 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2204 res = -EBADFD; 2205 goto _end; 2206 } 2207 if (snd_pcm_stream_linked(substream1)) { 2208 res = -EALREADY; 2209 goto _end; 2210 } 2211 2212 snd_pcm_stream_lock_irq(substream); 2213 if (!snd_pcm_stream_linked(substream)) { 2214 snd_pcm_group_assign(substream, group); 2215 group = NULL; /* assigned, don't free this one below */ 2216 } 2217 target_group = substream->group; 2218 snd_pcm_stream_unlock_irq(substream); 2219 2220 snd_pcm_group_lock_irq(target_group, nonatomic); 2221 snd_pcm_stream_lock_nested(substream1); 2222 snd_pcm_group_assign(substream1, target_group); 2223 refcount_inc(&target_group->refs); 2224 snd_pcm_stream_unlock(substream1); 2225 snd_pcm_group_unlock_irq(target_group, nonatomic); 2226 _end: 2227 up_write(&snd_pcm_link_rwsem); 2228 _nolock: 2229 kfree(group); 2230 _badf: 2231 fdput(f); 2232 return res; 2233 } 2234 2235 static void relink_to_local(struct snd_pcm_substream *substream) 2236 { 2237 snd_pcm_stream_lock_nested(substream); 2238 snd_pcm_group_assign(substream, &substream->self_group); 2239 snd_pcm_stream_unlock(substream); 2240 } 2241 2242 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2243 { 2244 struct snd_pcm_group *group; 2245 bool nonatomic = substream->pcm->nonatomic; 2246 bool do_free = false; 2247 int res = 0; 2248 2249 down_write(&snd_pcm_link_rwsem); 2250 2251 if (!snd_pcm_stream_linked(substream)) { 2252 res = -EALREADY; 2253 goto _end; 2254 } 2255 2256 group = substream->group; 2257 snd_pcm_group_lock_irq(group, nonatomic); 2258 2259 relink_to_local(substream); 2260 refcount_dec(&group->refs); 2261 2262 /* detach the last stream, too */ 2263 if (list_is_singular(&group->substreams)) { 2264 relink_to_local(list_first_entry(&group->substreams, 2265 struct snd_pcm_substream, 2266 link_list)); 2267 do_free = refcount_dec_and_test(&group->refs); 2268 } 2269 2270 snd_pcm_group_unlock_irq(group, nonatomic); 2271 if (do_free) 2272 kfree(group); 2273 2274 _end: 2275 up_write(&snd_pcm_link_rwsem); 2276 return res; 2277 } 2278 2279 /* 2280 * hw configurator 2281 */ 2282 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2283 struct snd_pcm_hw_rule *rule) 2284 { 2285 struct snd_interval t; 2286 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2287 hw_param_interval_c(params, rule->deps[1]), &t); 2288 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2289 } 2290 2291 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2292 struct snd_pcm_hw_rule *rule) 2293 { 2294 struct snd_interval t; 2295 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2296 hw_param_interval_c(params, rule->deps[1]), &t); 2297 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2298 } 2299 2300 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2301 struct snd_pcm_hw_rule *rule) 2302 { 2303 struct snd_interval t; 2304 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2305 hw_param_interval_c(params, rule->deps[1]), 2306 (unsigned long) rule->private, &t); 2307 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2308 } 2309 2310 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2311 struct snd_pcm_hw_rule *rule) 2312 { 2313 struct snd_interval t; 2314 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2315 (unsigned long) rule->private, 2316 hw_param_interval_c(params, rule->deps[1]), &t); 2317 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2318 } 2319 2320 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2321 struct snd_pcm_hw_rule *rule) 2322 { 2323 snd_pcm_format_t k; 2324 const struct snd_interval *i = 2325 hw_param_interval_c(params, rule->deps[0]); 2326 struct snd_mask m; 2327 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2328 snd_mask_any(&m); 2329 pcm_for_each_format(k) { 2330 int bits; 2331 if (!snd_mask_test_format(mask, k)) 2332 continue; 2333 bits = snd_pcm_format_physical_width(k); 2334 if (bits <= 0) 2335 continue; /* ignore invalid formats */ 2336 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2337 snd_mask_reset(&m, (__force unsigned)k); 2338 } 2339 return snd_mask_refine(mask, &m); 2340 } 2341 2342 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2343 struct snd_pcm_hw_rule *rule) 2344 { 2345 struct snd_interval t; 2346 snd_pcm_format_t k; 2347 2348 t.min = UINT_MAX; 2349 t.max = 0; 2350 t.openmin = 0; 2351 t.openmax = 0; 2352 pcm_for_each_format(k) { 2353 int bits; 2354 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2355 continue; 2356 bits = snd_pcm_format_physical_width(k); 2357 if (bits <= 0) 2358 continue; /* ignore invalid formats */ 2359 if (t.min > (unsigned)bits) 2360 t.min = bits; 2361 if (t.max < (unsigned)bits) 2362 t.max = bits; 2363 } 2364 t.integer = 1; 2365 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2366 } 2367 2368 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2369 #error "Change this table" 2370 #endif 2371 2372 static const unsigned int rates[] = { 2373 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2374 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2375 }; 2376 2377 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2378 .count = ARRAY_SIZE(rates), 2379 .list = rates, 2380 }; 2381 2382 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2383 struct snd_pcm_hw_rule *rule) 2384 { 2385 struct snd_pcm_hardware *hw = rule->private; 2386 return snd_interval_list(hw_param_interval(params, rule->var), 2387 snd_pcm_known_rates.count, 2388 snd_pcm_known_rates.list, hw->rates); 2389 } 2390 2391 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2392 struct snd_pcm_hw_rule *rule) 2393 { 2394 struct snd_interval t; 2395 struct snd_pcm_substream *substream = rule->private; 2396 t.min = 0; 2397 t.max = substream->buffer_bytes_max; 2398 t.openmin = 0; 2399 t.openmax = 0; 2400 t.integer = 1; 2401 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2402 } 2403 2404 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2405 { 2406 struct snd_pcm_runtime *runtime = substream->runtime; 2407 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2408 int k, err; 2409 2410 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2411 snd_mask_any(constrs_mask(constrs, k)); 2412 } 2413 2414 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2415 snd_interval_any(constrs_interval(constrs, k)); 2416 } 2417 2418 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2419 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2420 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2421 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2422 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2423 2424 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2425 snd_pcm_hw_rule_format, NULL, 2426 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2427 if (err < 0) 2428 return err; 2429 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2430 snd_pcm_hw_rule_sample_bits, NULL, 2431 SNDRV_PCM_HW_PARAM_FORMAT, 2432 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2433 if (err < 0) 2434 return err; 2435 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2436 snd_pcm_hw_rule_div, NULL, 2437 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2438 if (err < 0) 2439 return err; 2440 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2441 snd_pcm_hw_rule_mul, NULL, 2442 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2443 if (err < 0) 2444 return err; 2445 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2446 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2447 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2448 if (err < 0) 2449 return err; 2450 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2451 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2452 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2453 if (err < 0) 2454 return err; 2455 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2456 snd_pcm_hw_rule_div, NULL, 2457 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2458 if (err < 0) 2459 return err; 2460 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2461 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2462 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2463 if (err < 0) 2464 return err; 2465 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2466 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2467 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2468 if (err < 0) 2469 return err; 2470 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2471 snd_pcm_hw_rule_div, NULL, 2472 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2473 if (err < 0) 2474 return err; 2475 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2476 snd_pcm_hw_rule_div, NULL, 2477 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2478 if (err < 0) 2479 return err; 2480 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2481 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2482 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2483 if (err < 0) 2484 return err; 2485 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2486 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2487 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2488 if (err < 0) 2489 return err; 2490 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2491 snd_pcm_hw_rule_mul, NULL, 2492 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2493 if (err < 0) 2494 return err; 2495 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2496 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2497 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2498 if (err < 0) 2499 return err; 2500 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2501 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2502 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2503 if (err < 0) 2504 return err; 2505 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2506 snd_pcm_hw_rule_muldivk, (void*) 8, 2507 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2508 if (err < 0) 2509 return err; 2510 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2511 snd_pcm_hw_rule_muldivk, (void*) 8, 2512 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2513 if (err < 0) 2514 return err; 2515 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2516 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2517 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2518 if (err < 0) 2519 return err; 2520 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2521 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2522 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2523 if (err < 0) 2524 return err; 2525 return 0; 2526 } 2527 2528 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2529 { 2530 struct snd_pcm_runtime *runtime = substream->runtime; 2531 struct snd_pcm_hardware *hw = &runtime->hw; 2532 int err; 2533 unsigned int mask = 0; 2534 2535 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2536 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED); 2537 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2538 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 2539 if (hw_support_mmap(substream)) { 2540 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2541 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED); 2542 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2543 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED); 2544 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2545 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX); 2546 } 2547 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2548 if (err < 0) 2549 return err; 2550 2551 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2552 if (err < 0) 2553 return err; 2554 2555 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 2556 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD)); 2557 if (err < 0) 2558 return err; 2559 2560 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2561 hw->channels_min, hw->channels_max); 2562 if (err < 0) 2563 return err; 2564 2565 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2566 hw->rate_min, hw->rate_max); 2567 if (err < 0) 2568 return err; 2569 2570 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2571 hw->period_bytes_min, hw->period_bytes_max); 2572 if (err < 0) 2573 return err; 2574 2575 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2576 hw->periods_min, hw->periods_max); 2577 if (err < 0) 2578 return err; 2579 2580 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2581 hw->period_bytes_min, hw->buffer_bytes_max); 2582 if (err < 0) 2583 return err; 2584 2585 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2586 snd_pcm_hw_rule_buffer_bytes_max, substream, 2587 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2588 if (err < 0) 2589 return err; 2590 2591 /* FIXME: remove */ 2592 if (runtime->dma_bytes) { 2593 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2594 if (err < 0) 2595 return err; 2596 } 2597 2598 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2599 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2600 snd_pcm_hw_rule_rate, hw, 2601 SNDRV_PCM_HW_PARAM_RATE, -1); 2602 if (err < 0) 2603 return err; 2604 } 2605 2606 /* FIXME: this belong to lowlevel */ 2607 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2608 2609 return 0; 2610 } 2611 2612 static void pcm_release_private(struct snd_pcm_substream *substream) 2613 { 2614 if (snd_pcm_stream_linked(substream)) 2615 snd_pcm_unlink(substream); 2616 } 2617 2618 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2619 { 2620 substream->ref_count--; 2621 if (substream->ref_count > 0) 2622 return; 2623 2624 snd_pcm_drop(substream); 2625 if (substream->hw_opened) { 2626 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2627 do_hw_free(substream); 2628 substream->ops->close(substream); 2629 substream->hw_opened = 0; 2630 } 2631 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 2632 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 2633 if (substream->pcm_release) { 2634 substream->pcm_release(substream); 2635 substream->pcm_release = NULL; 2636 } 2637 snd_pcm_detach_substream(substream); 2638 } 2639 EXPORT_SYMBOL(snd_pcm_release_substream); 2640 2641 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2642 struct file *file, 2643 struct snd_pcm_substream **rsubstream) 2644 { 2645 struct snd_pcm_substream *substream; 2646 int err; 2647 2648 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2649 if (err < 0) 2650 return err; 2651 if (substream->ref_count > 1) { 2652 *rsubstream = substream; 2653 return 0; 2654 } 2655 2656 err = snd_pcm_hw_constraints_init(substream); 2657 if (err < 0) { 2658 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2659 goto error; 2660 } 2661 2662 err = substream->ops->open(substream); 2663 if (err < 0) 2664 goto error; 2665 2666 substream->hw_opened = 1; 2667 2668 err = snd_pcm_hw_constraints_complete(substream); 2669 if (err < 0) { 2670 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2671 goto error; 2672 } 2673 2674 *rsubstream = substream; 2675 return 0; 2676 2677 error: 2678 snd_pcm_release_substream(substream); 2679 return err; 2680 } 2681 EXPORT_SYMBOL(snd_pcm_open_substream); 2682 2683 static int snd_pcm_open_file(struct file *file, 2684 struct snd_pcm *pcm, 2685 int stream) 2686 { 2687 struct snd_pcm_file *pcm_file; 2688 struct snd_pcm_substream *substream; 2689 int err; 2690 2691 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2692 if (err < 0) 2693 return err; 2694 2695 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2696 if (pcm_file == NULL) { 2697 snd_pcm_release_substream(substream); 2698 return -ENOMEM; 2699 } 2700 pcm_file->substream = substream; 2701 if (substream->ref_count == 1) 2702 substream->pcm_release = pcm_release_private; 2703 file->private_data = pcm_file; 2704 2705 return 0; 2706 } 2707 2708 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2709 { 2710 struct snd_pcm *pcm; 2711 int err = nonseekable_open(inode, file); 2712 if (err < 0) 2713 return err; 2714 pcm = snd_lookup_minor_data(iminor(inode), 2715 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2716 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2717 if (pcm) 2718 snd_card_unref(pcm->card); 2719 return err; 2720 } 2721 2722 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2723 { 2724 struct snd_pcm *pcm; 2725 int err = nonseekable_open(inode, file); 2726 if (err < 0) 2727 return err; 2728 pcm = snd_lookup_minor_data(iminor(inode), 2729 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2730 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2731 if (pcm) 2732 snd_card_unref(pcm->card); 2733 return err; 2734 } 2735 2736 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2737 { 2738 int err; 2739 wait_queue_entry_t wait; 2740 2741 if (pcm == NULL) { 2742 err = -ENODEV; 2743 goto __error1; 2744 } 2745 err = snd_card_file_add(pcm->card, file); 2746 if (err < 0) 2747 goto __error1; 2748 if (!try_module_get(pcm->card->module)) { 2749 err = -EFAULT; 2750 goto __error2; 2751 } 2752 init_waitqueue_entry(&wait, current); 2753 add_wait_queue(&pcm->open_wait, &wait); 2754 mutex_lock(&pcm->open_mutex); 2755 while (1) { 2756 err = snd_pcm_open_file(file, pcm, stream); 2757 if (err >= 0) 2758 break; 2759 if (err == -EAGAIN) { 2760 if (file->f_flags & O_NONBLOCK) { 2761 err = -EBUSY; 2762 break; 2763 } 2764 } else 2765 break; 2766 set_current_state(TASK_INTERRUPTIBLE); 2767 mutex_unlock(&pcm->open_mutex); 2768 schedule(); 2769 mutex_lock(&pcm->open_mutex); 2770 if (pcm->card->shutdown) { 2771 err = -ENODEV; 2772 break; 2773 } 2774 if (signal_pending(current)) { 2775 err = -ERESTARTSYS; 2776 break; 2777 } 2778 } 2779 remove_wait_queue(&pcm->open_wait, &wait); 2780 mutex_unlock(&pcm->open_mutex); 2781 if (err < 0) 2782 goto __error; 2783 return err; 2784 2785 __error: 2786 module_put(pcm->card->module); 2787 __error2: 2788 snd_card_file_remove(pcm->card, file); 2789 __error1: 2790 return err; 2791 } 2792 2793 static int snd_pcm_release(struct inode *inode, struct file *file) 2794 { 2795 struct snd_pcm *pcm; 2796 struct snd_pcm_substream *substream; 2797 struct snd_pcm_file *pcm_file; 2798 2799 pcm_file = file->private_data; 2800 substream = pcm_file->substream; 2801 if (snd_BUG_ON(!substream)) 2802 return -ENXIO; 2803 pcm = substream->pcm; 2804 2805 /* block until the device gets woken up as it may touch the hardware */ 2806 snd_power_wait(pcm->card); 2807 2808 mutex_lock(&pcm->open_mutex); 2809 snd_pcm_release_substream(substream); 2810 kfree(pcm_file); 2811 mutex_unlock(&pcm->open_mutex); 2812 wake_up(&pcm->open_wait); 2813 module_put(pcm->card->module); 2814 snd_card_file_remove(pcm->card, file); 2815 return 0; 2816 } 2817 2818 /* check and update PCM state; return 0 or a negative error 2819 * call this inside PCM lock 2820 */ 2821 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2822 { 2823 switch (substream->runtime->status->state) { 2824 case SNDRV_PCM_STATE_DRAINING: 2825 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2826 return -EBADFD; 2827 fallthrough; 2828 case SNDRV_PCM_STATE_RUNNING: 2829 return snd_pcm_update_hw_ptr(substream); 2830 case SNDRV_PCM_STATE_PREPARED: 2831 case SNDRV_PCM_STATE_PAUSED: 2832 return 0; 2833 case SNDRV_PCM_STATE_SUSPENDED: 2834 return -ESTRPIPE; 2835 case SNDRV_PCM_STATE_XRUN: 2836 return -EPIPE; 2837 default: 2838 return -EBADFD; 2839 } 2840 } 2841 2842 /* increase the appl_ptr; returns the processed frames or a negative error */ 2843 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2844 snd_pcm_uframes_t frames, 2845 snd_pcm_sframes_t avail) 2846 { 2847 struct snd_pcm_runtime *runtime = substream->runtime; 2848 snd_pcm_sframes_t appl_ptr; 2849 int ret; 2850 2851 if (avail <= 0) 2852 return 0; 2853 if (frames > (snd_pcm_uframes_t)avail) 2854 frames = avail; 2855 appl_ptr = runtime->control->appl_ptr + frames; 2856 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2857 appl_ptr -= runtime->boundary; 2858 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2859 return ret < 0 ? ret : frames; 2860 } 2861 2862 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2863 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2864 snd_pcm_uframes_t frames, 2865 snd_pcm_sframes_t avail) 2866 { 2867 struct snd_pcm_runtime *runtime = substream->runtime; 2868 snd_pcm_sframes_t appl_ptr; 2869 int ret; 2870 2871 if (avail <= 0) 2872 return 0; 2873 if (frames > (snd_pcm_uframes_t)avail) 2874 frames = avail; 2875 appl_ptr = runtime->control->appl_ptr - frames; 2876 if (appl_ptr < 0) 2877 appl_ptr += runtime->boundary; 2878 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2879 /* NOTE: we return zero for errors because PulseAudio gets depressed 2880 * upon receiving an error from rewind ioctl and stops processing 2881 * any longer. Returning zero means that no rewind is done, so 2882 * it's not absolutely wrong to answer like that. 2883 */ 2884 return ret < 0 ? 0 : frames; 2885 } 2886 2887 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2888 snd_pcm_uframes_t frames) 2889 { 2890 snd_pcm_sframes_t ret; 2891 2892 if (frames == 0) 2893 return 0; 2894 2895 snd_pcm_stream_lock_irq(substream); 2896 ret = do_pcm_hwsync(substream); 2897 if (!ret) 2898 ret = rewind_appl_ptr(substream, frames, 2899 snd_pcm_hw_avail(substream)); 2900 snd_pcm_stream_unlock_irq(substream); 2901 return ret; 2902 } 2903 2904 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2905 snd_pcm_uframes_t frames) 2906 { 2907 snd_pcm_sframes_t ret; 2908 2909 if (frames == 0) 2910 return 0; 2911 2912 snd_pcm_stream_lock_irq(substream); 2913 ret = do_pcm_hwsync(substream); 2914 if (!ret) 2915 ret = forward_appl_ptr(substream, frames, 2916 snd_pcm_avail(substream)); 2917 snd_pcm_stream_unlock_irq(substream); 2918 return ret; 2919 } 2920 2921 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2922 { 2923 int err; 2924 2925 snd_pcm_stream_lock_irq(substream); 2926 err = do_pcm_hwsync(substream); 2927 snd_pcm_stream_unlock_irq(substream); 2928 return err; 2929 } 2930 2931 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2932 snd_pcm_sframes_t *delay) 2933 { 2934 int err; 2935 snd_pcm_sframes_t n = 0; 2936 2937 snd_pcm_stream_lock_irq(substream); 2938 err = do_pcm_hwsync(substream); 2939 if (!err) 2940 n = snd_pcm_calc_delay(substream); 2941 snd_pcm_stream_unlock_irq(substream); 2942 if (!err) 2943 *delay = n; 2944 return err; 2945 } 2946 2947 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2948 struct snd_pcm_sync_ptr __user *_sync_ptr) 2949 { 2950 struct snd_pcm_runtime *runtime = substream->runtime; 2951 struct snd_pcm_sync_ptr sync_ptr; 2952 volatile struct snd_pcm_mmap_status *status; 2953 volatile struct snd_pcm_mmap_control *control; 2954 int err; 2955 2956 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2957 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2958 return -EFAULT; 2959 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2960 return -EFAULT; 2961 status = runtime->status; 2962 control = runtime->control; 2963 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2964 err = snd_pcm_hwsync(substream); 2965 if (err < 0) 2966 return err; 2967 } 2968 snd_pcm_stream_lock_irq(substream); 2969 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2970 err = pcm_lib_apply_appl_ptr(substream, 2971 sync_ptr.c.control.appl_ptr); 2972 if (err < 0) { 2973 snd_pcm_stream_unlock_irq(substream); 2974 return err; 2975 } 2976 } else { 2977 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2978 } 2979 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2980 control->avail_min = sync_ptr.c.control.avail_min; 2981 else 2982 sync_ptr.c.control.avail_min = control->avail_min; 2983 sync_ptr.s.status.state = status->state; 2984 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2985 sync_ptr.s.status.tstamp = status->tstamp; 2986 sync_ptr.s.status.suspended_state = status->suspended_state; 2987 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2988 snd_pcm_stream_unlock_irq(substream); 2989 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2990 return -EFAULT; 2991 return 0; 2992 } 2993 2994 struct snd_pcm_mmap_status32 { 2995 snd_pcm_state_t state; 2996 s32 pad1; 2997 u32 hw_ptr; 2998 s32 tstamp_sec; 2999 s32 tstamp_nsec; 3000 snd_pcm_state_t suspended_state; 3001 s32 audio_tstamp_sec; 3002 s32 audio_tstamp_nsec; 3003 } __attribute__((packed)); 3004 3005 struct snd_pcm_mmap_control32 { 3006 u32 appl_ptr; 3007 u32 avail_min; 3008 }; 3009 3010 struct snd_pcm_sync_ptr32 { 3011 u32 flags; 3012 union { 3013 struct snd_pcm_mmap_status32 status; 3014 unsigned char reserved[64]; 3015 } s; 3016 union { 3017 struct snd_pcm_mmap_control32 control; 3018 unsigned char reserved[64]; 3019 } c; 3020 } __attribute__((packed)); 3021 3022 /* recalcuate the boundary within 32bit */ 3023 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime) 3024 { 3025 snd_pcm_uframes_t boundary; 3026 3027 if (! runtime->buffer_size) 3028 return 0; 3029 boundary = runtime->buffer_size; 3030 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size) 3031 boundary *= 2; 3032 return boundary; 3033 } 3034 3035 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, 3036 struct snd_pcm_sync_ptr32 __user *src) 3037 { 3038 struct snd_pcm_runtime *runtime = substream->runtime; 3039 volatile struct snd_pcm_mmap_status *status; 3040 volatile struct snd_pcm_mmap_control *control; 3041 u32 sflags; 3042 struct snd_pcm_mmap_control scontrol; 3043 struct snd_pcm_mmap_status sstatus; 3044 snd_pcm_uframes_t boundary; 3045 int err; 3046 3047 if (snd_BUG_ON(!runtime)) 3048 return -EINVAL; 3049 3050 if (get_user(sflags, &src->flags) || 3051 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3052 get_user(scontrol.avail_min, &src->c.control.avail_min)) 3053 return -EFAULT; 3054 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3055 err = snd_pcm_hwsync(substream); 3056 if (err < 0) 3057 return err; 3058 } 3059 status = runtime->status; 3060 control = runtime->control; 3061 boundary = recalculate_boundary(runtime); 3062 if (! boundary) 3063 boundary = 0x7fffffff; 3064 snd_pcm_stream_lock_irq(substream); 3065 /* FIXME: we should consider the boundary for the sync from app */ 3066 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 3067 control->appl_ptr = scontrol.appl_ptr; 3068 else 3069 scontrol.appl_ptr = control->appl_ptr % boundary; 3070 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3071 control->avail_min = scontrol.avail_min; 3072 else 3073 scontrol.avail_min = control->avail_min; 3074 sstatus.state = status->state; 3075 sstatus.hw_ptr = status->hw_ptr % boundary; 3076 sstatus.tstamp = status->tstamp; 3077 sstatus.suspended_state = status->suspended_state; 3078 sstatus.audio_tstamp = status->audio_tstamp; 3079 snd_pcm_stream_unlock_irq(substream); 3080 if (put_user(sstatus.state, &src->s.status.state) || 3081 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || 3082 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) || 3083 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) || 3084 put_user(sstatus.suspended_state, &src->s.status.suspended_state) || 3085 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) || 3086 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) || 3087 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3088 put_user(scontrol.avail_min, &src->c.control.avail_min)) 3089 return -EFAULT; 3090 3091 return 0; 3092 } 3093 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32) 3094 3095 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 3096 { 3097 struct snd_pcm_runtime *runtime = substream->runtime; 3098 int arg; 3099 3100 if (get_user(arg, _arg)) 3101 return -EFAULT; 3102 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 3103 return -EINVAL; 3104 runtime->tstamp_type = arg; 3105 return 0; 3106 } 3107 3108 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 3109 struct snd_xferi __user *_xferi) 3110 { 3111 struct snd_xferi xferi; 3112 struct snd_pcm_runtime *runtime = substream->runtime; 3113 snd_pcm_sframes_t result; 3114 3115 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3116 return -EBADFD; 3117 if (put_user(0, &_xferi->result)) 3118 return -EFAULT; 3119 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 3120 return -EFAULT; 3121 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3122 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 3123 else 3124 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 3125 if (put_user(result, &_xferi->result)) 3126 return -EFAULT; 3127 return result < 0 ? result : 0; 3128 } 3129 3130 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 3131 struct snd_xfern __user *_xfern) 3132 { 3133 struct snd_xfern xfern; 3134 struct snd_pcm_runtime *runtime = substream->runtime; 3135 void *bufs; 3136 snd_pcm_sframes_t result; 3137 3138 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3139 return -EBADFD; 3140 if (runtime->channels > 128) 3141 return -EINVAL; 3142 if (put_user(0, &_xfern->result)) 3143 return -EFAULT; 3144 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 3145 return -EFAULT; 3146 3147 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 3148 if (IS_ERR(bufs)) 3149 return PTR_ERR(bufs); 3150 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3151 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 3152 else 3153 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 3154 kfree(bufs); 3155 if (put_user(result, &_xfern->result)) 3156 return -EFAULT; 3157 return result < 0 ? result : 0; 3158 } 3159 3160 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 3161 snd_pcm_uframes_t __user *_frames) 3162 { 3163 snd_pcm_uframes_t frames; 3164 snd_pcm_sframes_t result; 3165 3166 if (get_user(frames, _frames)) 3167 return -EFAULT; 3168 if (put_user(0, _frames)) 3169 return -EFAULT; 3170 result = snd_pcm_rewind(substream, frames); 3171 if (put_user(result, _frames)) 3172 return -EFAULT; 3173 return result < 0 ? result : 0; 3174 } 3175 3176 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 3177 snd_pcm_uframes_t __user *_frames) 3178 { 3179 snd_pcm_uframes_t frames; 3180 snd_pcm_sframes_t result; 3181 3182 if (get_user(frames, _frames)) 3183 return -EFAULT; 3184 if (put_user(0, _frames)) 3185 return -EFAULT; 3186 result = snd_pcm_forward(substream, frames); 3187 if (put_user(result, _frames)) 3188 return -EFAULT; 3189 return result < 0 ? result : 0; 3190 } 3191 3192 static int snd_pcm_common_ioctl(struct file *file, 3193 struct snd_pcm_substream *substream, 3194 unsigned int cmd, void __user *arg) 3195 { 3196 struct snd_pcm_file *pcm_file = file->private_data; 3197 int res; 3198 3199 if (PCM_RUNTIME_CHECK(substream)) 3200 return -ENXIO; 3201 3202 res = snd_power_wait(substream->pcm->card); 3203 if (res < 0) 3204 return res; 3205 3206 switch (cmd) { 3207 case SNDRV_PCM_IOCTL_PVERSION: 3208 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 3209 case SNDRV_PCM_IOCTL_INFO: 3210 return snd_pcm_info_user(substream, arg); 3211 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 3212 return 0; 3213 case SNDRV_PCM_IOCTL_TTSTAMP: 3214 return snd_pcm_tstamp(substream, arg); 3215 case SNDRV_PCM_IOCTL_USER_PVERSION: 3216 if (get_user(pcm_file->user_pversion, 3217 (unsigned int __user *)arg)) 3218 return -EFAULT; 3219 return 0; 3220 case SNDRV_PCM_IOCTL_HW_REFINE: 3221 return snd_pcm_hw_refine_user(substream, arg); 3222 case SNDRV_PCM_IOCTL_HW_PARAMS: 3223 return snd_pcm_hw_params_user(substream, arg); 3224 case SNDRV_PCM_IOCTL_HW_FREE: 3225 return snd_pcm_hw_free(substream); 3226 case SNDRV_PCM_IOCTL_SW_PARAMS: 3227 return snd_pcm_sw_params_user(substream, arg); 3228 case SNDRV_PCM_IOCTL_STATUS32: 3229 return snd_pcm_status_user32(substream, arg, false); 3230 case SNDRV_PCM_IOCTL_STATUS_EXT32: 3231 return snd_pcm_status_user32(substream, arg, true); 3232 case SNDRV_PCM_IOCTL_STATUS64: 3233 return snd_pcm_status_user64(substream, arg, false); 3234 case SNDRV_PCM_IOCTL_STATUS_EXT64: 3235 return snd_pcm_status_user64(substream, arg, true); 3236 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 3237 return snd_pcm_channel_info_user(substream, arg); 3238 case SNDRV_PCM_IOCTL_PREPARE: 3239 return snd_pcm_prepare(substream, file); 3240 case SNDRV_PCM_IOCTL_RESET: 3241 return snd_pcm_reset(substream); 3242 case SNDRV_PCM_IOCTL_START: 3243 return snd_pcm_start_lock_irq(substream); 3244 case SNDRV_PCM_IOCTL_LINK: 3245 return snd_pcm_link(substream, (int)(unsigned long) arg); 3246 case SNDRV_PCM_IOCTL_UNLINK: 3247 return snd_pcm_unlink(substream); 3248 case SNDRV_PCM_IOCTL_RESUME: 3249 return snd_pcm_resume(substream); 3250 case SNDRV_PCM_IOCTL_XRUN: 3251 return snd_pcm_xrun(substream); 3252 case SNDRV_PCM_IOCTL_HWSYNC: 3253 return snd_pcm_hwsync(substream); 3254 case SNDRV_PCM_IOCTL_DELAY: 3255 { 3256 snd_pcm_sframes_t delay; 3257 snd_pcm_sframes_t __user *res = arg; 3258 int err; 3259 3260 err = snd_pcm_delay(substream, &delay); 3261 if (err) 3262 return err; 3263 if (put_user(delay, res)) 3264 return -EFAULT; 3265 return 0; 3266 } 3267 case __SNDRV_PCM_IOCTL_SYNC_PTR32: 3268 return snd_pcm_ioctl_sync_ptr_compat(substream, arg); 3269 case __SNDRV_PCM_IOCTL_SYNC_PTR64: 3270 return snd_pcm_sync_ptr(substream, arg); 3271 #ifdef CONFIG_SND_SUPPORT_OLD_API 3272 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 3273 return snd_pcm_hw_refine_old_user(substream, arg); 3274 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 3275 return snd_pcm_hw_params_old_user(substream, arg); 3276 #endif 3277 case SNDRV_PCM_IOCTL_DRAIN: 3278 return snd_pcm_drain(substream, file); 3279 case SNDRV_PCM_IOCTL_DROP: 3280 return snd_pcm_drop(substream); 3281 case SNDRV_PCM_IOCTL_PAUSE: 3282 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg); 3283 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3284 case SNDRV_PCM_IOCTL_READI_FRAMES: 3285 return snd_pcm_xferi_frames_ioctl(substream, arg); 3286 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3287 case SNDRV_PCM_IOCTL_READN_FRAMES: 3288 return snd_pcm_xfern_frames_ioctl(substream, arg); 3289 case SNDRV_PCM_IOCTL_REWIND: 3290 return snd_pcm_rewind_ioctl(substream, arg); 3291 case SNDRV_PCM_IOCTL_FORWARD: 3292 return snd_pcm_forward_ioctl(substream, arg); 3293 } 3294 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3295 return -ENOTTY; 3296 } 3297 3298 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3299 unsigned long arg) 3300 { 3301 struct snd_pcm_file *pcm_file; 3302 3303 pcm_file = file->private_data; 3304 3305 if (((cmd >> 8) & 0xff) != 'A') 3306 return -ENOTTY; 3307 3308 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3309 (void __user *)arg); 3310 } 3311 3312 /** 3313 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3314 * @substream: PCM substream 3315 * @cmd: IOCTL cmd 3316 * @arg: IOCTL argument 3317 * 3318 * The function is provided primarily for OSS layer and USB gadget drivers, 3319 * and it allows only the limited set of ioctls (hw_params, sw_params, 3320 * prepare, start, drain, drop, forward). 3321 */ 3322 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3323 unsigned int cmd, void *arg) 3324 { 3325 snd_pcm_uframes_t *frames = arg; 3326 snd_pcm_sframes_t result; 3327 3328 switch (cmd) { 3329 case SNDRV_PCM_IOCTL_FORWARD: 3330 { 3331 /* provided only for OSS; capture-only and no value returned */ 3332 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3333 return -EINVAL; 3334 result = snd_pcm_forward(substream, *frames); 3335 return result < 0 ? result : 0; 3336 } 3337 case SNDRV_PCM_IOCTL_HW_PARAMS: 3338 return snd_pcm_hw_params(substream, arg); 3339 case SNDRV_PCM_IOCTL_SW_PARAMS: 3340 return snd_pcm_sw_params(substream, arg); 3341 case SNDRV_PCM_IOCTL_PREPARE: 3342 return snd_pcm_prepare(substream, NULL); 3343 case SNDRV_PCM_IOCTL_START: 3344 return snd_pcm_start_lock_irq(substream); 3345 case SNDRV_PCM_IOCTL_DRAIN: 3346 return snd_pcm_drain(substream, NULL); 3347 case SNDRV_PCM_IOCTL_DROP: 3348 return snd_pcm_drop(substream); 3349 case SNDRV_PCM_IOCTL_DELAY: 3350 return snd_pcm_delay(substream, frames); 3351 default: 3352 return -EINVAL; 3353 } 3354 } 3355 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3356 3357 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3358 loff_t * offset) 3359 { 3360 struct snd_pcm_file *pcm_file; 3361 struct snd_pcm_substream *substream; 3362 struct snd_pcm_runtime *runtime; 3363 snd_pcm_sframes_t result; 3364 3365 pcm_file = file->private_data; 3366 substream = pcm_file->substream; 3367 if (PCM_RUNTIME_CHECK(substream)) 3368 return -ENXIO; 3369 runtime = substream->runtime; 3370 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3371 return -EBADFD; 3372 if (!frame_aligned(runtime, count)) 3373 return -EINVAL; 3374 count = bytes_to_frames(runtime, count); 3375 result = snd_pcm_lib_read(substream, buf, count); 3376 if (result > 0) 3377 result = frames_to_bytes(runtime, result); 3378 return result; 3379 } 3380 3381 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3382 size_t count, loff_t * offset) 3383 { 3384 struct snd_pcm_file *pcm_file; 3385 struct snd_pcm_substream *substream; 3386 struct snd_pcm_runtime *runtime; 3387 snd_pcm_sframes_t result; 3388 3389 pcm_file = file->private_data; 3390 substream = pcm_file->substream; 3391 if (PCM_RUNTIME_CHECK(substream)) 3392 return -ENXIO; 3393 runtime = substream->runtime; 3394 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3395 return -EBADFD; 3396 if (!frame_aligned(runtime, count)) 3397 return -EINVAL; 3398 count = bytes_to_frames(runtime, count); 3399 result = snd_pcm_lib_write(substream, buf, count); 3400 if (result > 0) 3401 result = frames_to_bytes(runtime, result); 3402 return result; 3403 } 3404 3405 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3406 { 3407 struct snd_pcm_file *pcm_file; 3408 struct snd_pcm_substream *substream; 3409 struct snd_pcm_runtime *runtime; 3410 snd_pcm_sframes_t result; 3411 unsigned long i; 3412 void __user **bufs; 3413 snd_pcm_uframes_t frames; 3414 3415 pcm_file = iocb->ki_filp->private_data; 3416 substream = pcm_file->substream; 3417 if (PCM_RUNTIME_CHECK(substream)) 3418 return -ENXIO; 3419 runtime = substream->runtime; 3420 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3421 return -EBADFD; 3422 if (!iter_is_iovec(to)) 3423 return -EINVAL; 3424 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3425 return -EINVAL; 3426 if (!frame_aligned(runtime, to->iov->iov_len)) 3427 return -EINVAL; 3428 frames = bytes_to_samples(runtime, to->iov->iov_len); 3429 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3430 if (bufs == NULL) 3431 return -ENOMEM; 3432 for (i = 0; i < to->nr_segs; ++i) 3433 bufs[i] = to->iov[i].iov_base; 3434 result = snd_pcm_lib_readv(substream, bufs, frames); 3435 if (result > 0) 3436 result = frames_to_bytes(runtime, result); 3437 kfree(bufs); 3438 return result; 3439 } 3440 3441 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3442 { 3443 struct snd_pcm_file *pcm_file; 3444 struct snd_pcm_substream *substream; 3445 struct snd_pcm_runtime *runtime; 3446 snd_pcm_sframes_t result; 3447 unsigned long i; 3448 void __user **bufs; 3449 snd_pcm_uframes_t frames; 3450 3451 pcm_file = iocb->ki_filp->private_data; 3452 substream = pcm_file->substream; 3453 if (PCM_RUNTIME_CHECK(substream)) 3454 return -ENXIO; 3455 runtime = substream->runtime; 3456 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3457 return -EBADFD; 3458 if (!iter_is_iovec(from)) 3459 return -EINVAL; 3460 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3461 !frame_aligned(runtime, from->iov->iov_len)) 3462 return -EINVAL; 3463 frames = bytes_to_samples(runtime, from->iov->iov_len); 3464 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3465 if (bufs == NULL) 3466 return -ENOMEM; 3467 for (i = 0; i < from->nr_segs; ++i) 3468 bufs[i] = from->iov[i].iov_base; 3469 result = snd_pcm_lib_writev(substream, bufs, frames); 3470 if (result > 0) 3471 result = frames_to_bytes(runtime, result); 3472 kfree(bufs); 3473 return result; 3474 } 3475 3476 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3477 { 3478 struct snd_pcm_file *pcm_file; 3479 struct snd_pcm_substream *substream; 3480 struct snd_pcm_runtime *runtime; 3481 __poll_t mask, ok; 3482 snd_pcm_uframes_t avail; 3483 3484 pcm_file = file->private_data; 3485 3486 substream = pcm_file->substream; 3487 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3488 ok = EPOLLOUT | EPOLLWRNORM; 3489 else 3490 ok = EPOLLIN | EPOLLRDNORM; 3491 if (PCM_RUNTIME_CHECK(substream)) 3492 return ok | EPOLLERR; 3493 3494 runtime = substream->runtime; 3495 poll_wait(file, &runtime->sleep, wait); 3496 3497 mask = 0; 3498 snd_pcm_stream_lock_irq(substream); 3499 avail = snd_pcm_avail(substream); 3500 switch (runtime->status->state) { 3501 case SNDRV_PCM_STATE_RUNNING: 3502 case SNDRV_PCM_STATE_PREPARED: 3503 case SNDRV_PCM_STATE_PAUSED: 3504 if (avail >= runtime->control->avail_min) 3505 mask = ok; 3506 break; 3507 case SNDRV_PCM_STATE_DRAINING: 3508 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3509 mask = ok; 3510 if (!avail) 3511 mask |= EPOLLERR; 3512 } 3513 break; 3514 default: 3515 mask = ok | EPOLLERR; 3516 break; 3517 } 3518 snd_pcm_stream_unlock_irq(substream); 3519 return mask; 3520 } 3521 3522 /* 3523 * mmap support 3524 */ 3525 3526 /* 3527 * Only on coherent architectures, we can mmap the status and the control records 3528 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3529 */ 3530 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3531 /* 3532 * mmap status record 3533 */ 3534 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3535 { 3536 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3537 struct snd_pcm_runtime *runtime; 3538 3539 if (substream == NULL) 3540 return VM_FAULT_SIGBUS; 3541 runtime = substream->runtime; 3542 vmf->page = virt_to_page(runtime->status); 3543 get_page(vmf->page); 3544 return 0; 3545 } 3546 3547 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3548 { 3549 .fault = snd_pcm_mmap_status_fault, 3550 }; 3551 3552 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3553 struct vm_area_struct *area) 3554 { 3555 long size; 3556 if (!(area->vm_flags & VM_READ)) 3557 return -EINVAL; 3558 size = area->vm_end - area->vm_start; 3559 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3560 return -EINVAL; 3561 area->vm_ops = &snd_pcm_vm_ops_status; 3562 area->vm_private_data = substream; 3563 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3564 return 0; 3565 } 3566 3567 /* 3568 * mmap control record 3569 */ 3570 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3571 { 3572 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3573 struct snd_pcm_runtime *runtime; 3574 3575 if (substream == NULL) 3576 return VM_FAULT_SIGBUS; 3577 runtime = substream->runtime; 3578 vmf->page = virt_to_page(runtime->control); 3579 get_page(vmf->page); 3580 return 0; 3581 } 3582 3583 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3584 { 3585 .fault = snd_pcm_mmap_control_fault, 3586 }; 3587 3588 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3589 struct vm_area_struct *area) 3590 { 3591 long size; 3592 if (!(area->vm_flags & VM_READ)) 3593 return -EINVAL; 3594 size = area->vm_end - area->vm_start; 3595 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3596 return -EINVAL; 3597 area->vm_ops = &snd_pcm_vm_ops_control; 3598 area->vm_private_data = substream; 3599 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3600 return 0; 3601 } 3602 3603 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3604 { 3605 /* See pcm_control_mmap_allowed() below. 3606 * Since older alsa-lib requires both status and control mmaps to be 3607 * coupled, we have to disable the status mmap for old alsa-lib, too. 3608 */ 3609 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3610 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3611 return false; 3612 return true; 3613 } 3614 3615 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3616 { 3617 if (pcm_file->no_compat_mmap) 3618 return false; 3619 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3620 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3621 * thus it effectively assures the manual update of appl_ptr. 3622 */ 3623 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3624 return false; 3625 return true; 3626 } 3627 3628 #else /* ! coherent mmap */ 3629 /* 3630 * don't support mmap for status and control records. 3631 */ 3632 #define pcm_status_mmap_allowed(pcm_file) false 3633 #define pcm_control_mmap_allowed(pcm_file) false 3634 3635 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3636 struct vm_area_struct *area) 3637 { 3638 return -ENXIO; 3639 } 3640 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3641 struct vm_area_struct *area) 3642 { 3643 return -ENXIO; 3644 } 3645 #endif /* coherent mmap */ 3646 3647 /* 3648 * fault callback for mmapping a RAM page 3649 */ 3650 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3651 { 3652 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3653 struct snd_pcm_runtime *runtime; 3654 unsigned long offset; 3655 struct page * page; 3656 size_t dma_bytes; 3657 3658 if (substream == NULL) 3659 return VM_FAULT_SIGBUS; 3660 runtime = substream->runtime; 3661 offset = vmf->pgoff << PAGE_SHIFT; 3662 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3663 if (offset > dma_bytes - PAGE_SIZE) 3664 return VM_FAULT_SIGBUS; 3665 if (substream->ops->page) 3666 page = substream->ops->page(substream, offset); 3667 else 3668 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset); 3669 if (!page) 3670 return VM_FAULT_SIGBUS; 3671 get_page(page); 3672 vmf->page = page; 3673 return 0; 3674 } 3675 3676 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3677 .open = snd_pcm_mmap_data_open, 3678 .close = snd_pcm_mmap_data_close, 3679 }; 3680 3681 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3682 .open = snd_pcm_mmap_data_open, 3683 .close = snd_pcm_mmap_data_close, 3684 .fault = snd_pcm_mmap_data_fault, 3685 }; 3686 3687 /* 3688 * mmap the DMA buffer on RAM 3689 */ 3690 3691 /** 3692 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3693 * @substream: PCM substream 3694 * @area: VMA 3695 * 3696 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3697 * this function is invoked implicitly. 3698 */ 3699 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3700 struct vm_area_struct *area) 3701 { 3702 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3703 if (!substream->ops->page && 3704 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area)) 3705 return 0; 3706 /* mmap with fault handler */ 3707 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3708 return 0; 3709 } 3710 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3711 3712 /* 3713 * mmap the DMA buffer on I/O memory area 3714 */ 3715 #if SNDRV_PCM_INFO_MMAP_IOMEM 3716 /** 3717 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3718 * @substream: PCM substream 3719 * @area: VMA 3720 * 3721 * When your hardware uses the iomapped pages as the hardware buffer and 3722 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3723 * is supposed to work only on limited architectures. 3724 */ 3725 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3726 struct vm_area_struct *area) 3727 { 3728 struct snd_pcm_runtime *runtime = substream->runtime; 3729 3730 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3731 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3732 } 3733 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3734 #endif /* SNDRV_PCM_INFO_MMAP */ 3735 3736 /* 3737 * mmap DMA buffer 3738 */ 3739 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3740 struct vm_area_struct *area) 3741 { 3742 struct snd_pcm_runtime *runtime; 3743 long size; 3744 unsigned long offset; 3745 size_t dma_bytes; 3746 int err; 3747 3748 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3749 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3750 return -EINVAL; 3751 } else { 3752 if (!(area->vm_flags & VM_READ)) 3753 return -EINVAL; 3754 } 3755 runtime = substream->runtime; 3756 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3757 return -EBADFD; 3758 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3759 return -ENXIO; 3760 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3761 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3762 return -EINVAL; 3763 size = area->vm_end - area->vm_start; 3764 offset = area->vm_pgoff << PAGE_SHIFT; 3765 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3766 if ((size_t)size > dma_bytes) 3767 return -EINVAL; 3768 if (offset > dma_bytes - size) 3769 return -EINVAL; 3770 3771 area->vm_ops = &snd_pcm_vm_ops_data; 3772 area->vm_private_data = substream; 3773 if (substream->ops->mmap) 3774 err = substream->ops->mmap(substream, area); 3775 else 3776 err = snd_pcm_lib_default_mmap(substream, area); 3777 if (!err) 3778 atomic_inc(&substream->mmap_count); 3779 return err; 3780 } 3781 EXPORT_SYMBOL(snd_pcm_mmap_data); 3782 3783 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3784 { 3785 struct snd_pcm_file * pcm_file; 3786 struct snd_pcm_substream *substream; 3787 unsigned long offset; 3788 3789 pcm_file = file->private_data; 3790 substream = pcm_file->substream; 3791 if (PCM_RUNTIME_CHECK(substream)) 3792 return -ENXIO; 3793 3794 offset = area->vm_pgoff << PAGE_SHIFT; 3795 switch (offset) { 3796 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD: 3797 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3798 return -ENXIO; 3799 fallthrough; 3800 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 3801 if (!pcm_status_mmap_allowed(pcm_file)) 3802 return -ENXIO; 3803 return snd_pcm_mmap_status(substream, file, area); 3804 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD: 3805 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3806 return -ENXIO; 3807 fallthrough; 3808 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 3809 if (!pcm_control_mmap_allowed(pcm_file)) 3810 return -ENXIO; 3811 return snd_pcm_mmap_control(substream, file, area); 3812 default: 3813 return snd_pcm_mmap_data(substream, file, area); 3814 } 3815 return 0; 3816 } 3817 3818 static int snd_pcm_fasync(int fd, struct file * file, int on) 3819 { 3820 struct snd_pcm_file * pcm_file; 3821 struct snd_pcm_substream *substream; 3822 struct snd_pcm_runtime *runtime; 3823 3824 pcm_file = file->private_data; 3825 substream = pcm_file->substream; 3826 if (PCM_RUNTIME_CHECK(substream)) 3827 return -ENXIO; 3828 runtime = substream->runtime; 3829 return fasync_helper(fd, file, on, &runtime->fasync); 3830 } 3831 3832 /* 3833 * ioctl32 compat 3834 */ 3835 #ifdef CONFIG_COMPAT 3836 #include "pcm_compat.c" 3837 #else 3838 #define snd_pcm_ioctl_compat NULL 3839 #endif 3840 3841 /* 3842 * To be removed helpers to keep binary compatibility 3843 */ 3844 3845 #ifdef CONFIG_SND_SUPPORT_OLD_API 3846 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3847 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3848 3849 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3850 struct snd_pcm_hw_params_old *oparams) 3851 { 3852 unsigned int i; 3853 3854 memset(params, 0, sizeof(*params)); 3855 params->flags = oparams->flags; 3856 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3857 params->masks[i].bits[0] = oparams->masks[i]; 3858 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3859 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3860 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3861 params->info = oparams->info; 3862 params->msbits = oparams->msbits; 3863 params->rate_num = oparams->rate_num; 3864 params->rate_den = oparams->rate_den; 3865 params->fifo_size = oparams->fifo_size; 3866 } 3867 3868 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3869 struct snd_pcm_hw_params *params) 3870 { 3871 unsigned int i; 3872 3873 memset(oparams, 0, sizeof(*oparams)); 3874 oparams->flags = params->flags; 3875 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3876 oparams->masks[i] = params->masks[i].bits[0]; 3877 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3878 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3879 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3880 oparams->info = params->info; 3881 oparams->msbits = params->msbits; 3882 oparams->rate_num = params->rate_num; 3883 oparams->rate_den = params->rate_den; 3884 oparams->fifo_size = params->fifo_size; 3885 } 3886 3887 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3888 struct snd_pcm_hw_params_old __user * _oparams) 3889 { 3890 struct snd_pcm_hw_params *params; 3891 struct snd_pcm_hw_params_old *oparams = NULL; 3892 int err; 3893 3894 params = kmalloc(sizeof(*params), GFP_KERNEL); 3895 if (!params) 3896 return -ENOMEM; 3897 3898 oparams = memdup_user(_oparams, sizeof(*oparams)); 3899 if (IS_ERR(oparams)) { 3900 err = PTR_ERR(oparams); 3901 goto out; 3902 } 3903 snd_pcm_hw_convert_from_old_params(params, oparams); 3904 err = snd_pcm_hw_refine(substream, params); 3905 if (err < 0) 3906 goto out_old; 3907 3908 err = fixup_unreferenced_params(substream, params); 3909 if (err < 0) 3910 goto out_old; 3911 3912 snd_pcm_hw_convert_to_old_params(oparams, params); 3913 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3914 err = -EFAULT; 3915 out_old: 3916 kfree(oparams); 3917 out: 3918 kfree(params); 3919 return err; 3920 } 3921 3922 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3923 struct snd_pcm_hw_params_old __user * _oparams) 3924 { 3925 struct snd_pcm_hw_params *params; 3926 struct snd_pcm_hw_params_old *oparams = NULL; 3927 int err; 3928 3929 params = kmalloc(sizeof(*params), GFP_KERNEL); 3930 if (!params) 3931 return -ENOMEM; 3932 3933 oparams = memdup_user(_oparams, sizeof(*oparams)); 3934 if (IS_ERR(oparams)) { 3935 err = PTR_ERR(oparams); 3936 goto out; 3937 } 3938 3939 snd_pcm_hw_convert_from_old_params(params, oparams); 3940 err = snd_pcm_hw_params(substream, params); 3941 if (err < 0) 3942 goto out_old; 3943 3944 snd_pcm_hw_convert_to_old_params(oparams, params); 3945 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3946 err = -EFAULT; 3947 out_old: 3948 kfree(oparams); 3949 out: 3950 kfree(params); 3951 return err; 3952 } 3953 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3954 3955 #ifndef CONFIG_MMU 3956 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3957 unsigned long addr, 3958 unsigned long len, 3959 unsigned long pgoff, 3960 unsigned long flags) 3961 { 3962 struct snd_pcm_file *pcm_file = file->private_data; 3963 struct snd_pcm_substream *substream = pcm_file->substream; 3964 struct snd_pcm_runtime *runtime = substream->runtime; 3965 unsigned long offset = pgoff << PAGE_SHIFT; 3966 3967 switch (offset) { 3968 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 3969 return (unsigned long)runtime->status; 3970 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 3971 return (unsigned long)runtime->control; 3972 default: 3973 return (unsigned long)runtime->dma_area + offset; 3974 } 3975 } 3976 #else 3977 # define snd_pcm_get_unmapped_area NULL 3978 #endif 3979 3980 /* 3981 * Register section 3982 */ 3983 3984 const struct file_operations snd_pcm_f_ops[2] = { 3985 { 3986 .owner = THIS_MODULE, 3987 .write = snd_pcm_write, 3988 .write_iter = snd_pcm_writev, 3989 .open = snd_pcm_playback_open, 3990 .release = snd_pcm_release, 3991 .llseek = no_llseek, 3992 .poll = snd_pcm_poll, 3993 .unlocked_ioctl = snd_pcm_ioctl, 3994 .compat_ioctl = snd_pcm_ioctl_compat, 3995 .mmap = snd_pcm_mmap, 3996 .fasync = snd_pcm_fasync, 3997 .get_unmapped_area = snd_pcm_get_unmapped_area, 3998 }, 3999 { 4000 .owner = THIS_MODULE, 4001 .read = snd_pcm_read, 4002 .read_iter = snd_pcm_readv, 4003 .open = snd_pcm_capture_open, 4004 .release = snd_pcm_release, 4005 .llseek = no_llseek, 4006 .poll = snd_pcm_poll, 4007 .unlocked_ioctl = snd_pcm_ioctl, 4008 .compat_ioctl = snd_pcm_ioctl_compat, 4009 .mmap = snd_pcm_mmap, 4010 .fasync = snd_pcm_fasync, 4011 .get_unmapped_area = snd_pcm_get_unmapped_area, 4012 } 4013 }; 4014