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 #include <linux/bitops.h> 28 29 #include "pcm_local.h" 30 31 #ifdef CONFIG_SND_DEBUG 32 #define CREATE_TRACE_POINTS 33 #include "pcm_param_trace.h" 34 #else 35 #define trace_hw_mask_param_enabled() 0 36 #define trace_hw_interval_param_enabled() 0 37 #define trace_hw_mask_param(substream, type, index, prev, curr) 38 #define trace_hw_interval_param(substream, type, index, prev, curr) 39 #endif 40 41 /* 42 * Compatibility 43 */ 44 45 struct snd_pcm_hw_params_old { 46 unsigned int flags; 47 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 48 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 49 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 50 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 51 unsigned int rmask; 52 unsigned int cmask; 53 unsigned int info; 54 unsigned int msbits; 55 unsigned int rate_num; 56 unsigned int rate_den; 57 snd_pcm_uframes_t fifo_size; 58 unsigned char reserved[64]; 59 }; 60 61 #ifdef CONFIG_SND_SUPPORT_OLD_API 62 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 63 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 64 65 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 66 struct snd_pcm_hw_params_old __user * _oparams); 67 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 68 struct snd_pcm_hw_params_old __user * _oparams); 69 #endif 70 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 71 72 /* 73 * 74 */ 75 76 static DECLARE_RWSEM(snd_pcm_link_rwsem); 77 78 void snd_pcm_group_init(struct snd_pcm_group *group) 79 { 80 spin_lock_init(&group->lock); 81 mutex_init(&group->mutex); 82 INIT_LIST_HEAD(&group->substreams); 83 refcount_set(&group->refs, 1); 84 } 85 86 /* define group lock helpers */ 87 #define DEFINE_PCM_GROUP_LOCK(action, bh_lock, bh_unlock, mutex_action) \ 88 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 89 { \ 90 if (nonatomic) { \ 91 mutex_ ## mutex_action(&group->mutex); \ 92 } else { \ 93 if (IS_ENABLED(CONFIG_PREEMPT_RT) && bh_lock) \ 94 local_bh_disable(); \ 95 spin_ ## action(&group->lock); \ 96 if (IS_ENABLED(CONFIG_PREEMPT_RT) && bh_unlock) \ 97 local_bh_enable(); \ 98 } \ 99 } 100 101 DEFINE_PCM_GROUP_LOCK(lock, false, false, lock); 102 DEFINE_PCM_GROUP_LOCK(unlock, false, false, unlock); 103 DEFINE_PCM_GROUP_LOCK(lock_irq, true, false, lock); 104 DEFINE_PCM_GROUP_LOCK(unlock_irq, false, true, unlock); 105 106 /** 107 * snd_pcm_stream_lock - Lock the PCM stream 108 * @substream: PCM substream 109 * 110 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 111 * flag of the given substream. This also takes the global link rw lock 112 * (or rw sem), too, for avoiding the race with linked streams. 113 */ 114 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 115 { 116 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 117 } 118 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 119 120 /** 121 * snd_pcm_stream_unlock - Unlock the PCM stream 122 * @substream: PCM substream 123 * 124 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 125 */ 126 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 127 { 128 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 129 } 130 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 131 132 /** 133 * snd_pcm_stream_lock_irq - Lock the PCM stream 134 * @substream: PCM substream 135 * 136 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 137 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 138 * as snd_pcm_stream_lock(). 139 */ 140 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 141 { 142 snd_pcm_group_lock_irq(&substream->self_group, 143 substream->pcm->nonatomic); 144 } 145 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 146 147 static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream) 148 { 149 struct snd_pcm_group *group = &substream->self_group; 150 151 if (substream->pcm->nonatomic) 152 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING); 153 else 154 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING); 155 } 156 157 /** 158 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 159 * @substream: PCM substream 160 * 161 * This is a counter-part of snd_pcm_stream_lock_irq(). 162 */ 163 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 164 { 165 snd_pcm_group_unlock_irq(&substream->self_group, 166 substream->pcm->nonatomic); 167 } 168 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 169 170 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 171 { 172 unsigned long flags = 0; 173 if (substream->pcm->nonatomic) 174 mutex_lock(&substream->self_group.mutex); 175 else 176 spin_lock_irqsave(&substream->self_group.lock, flags); 177 return flags; 178 } 179 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 180 181 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream) 182 { 183 unsigned long flags = 0; 184 if (substream->pcm->nonatomic) 185 mutex_lock_nested(&substream->self_group.mutex, 186 SINGLE_DEPTH_NESTING); 187 else 188 spin_lock_irqsave_nested(&substream->self_group.lock, flags, 189 SINGLE_DEPTH_NESTING); 190 return flags; 191 } 192 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested); 193 194 /** 195 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 196 * @substream: PCM substream 197 * @flags: irq flags 198 * 199 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 200 */ 201 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 202 unsigned long flags) 203 { 204 if (substream->pcm->nonatomic) 205 mutex_unlock(&substream->self_group.mutex); 206 else 207 spin_unlock_irqrestore(&substream->self_group.lock, flags); 208 } 209 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 210 211 /* Run PCM ioctl ops */ 212 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream, 213 unsigned cmd, void *arg) 214 { 215 if (substream->ops->ioctl) 216 return substream->ops->ioctl(substream, cmd, arg); 217 else 218 return snd_pcm_lib_ioctl(substream, cmd, arg); 219 } 220 221 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 222 { 223 struct snd_pcm *pcm = substream->pcm; 224 struct snd_pcm_str *pstr = substream->pstr; 225 226 memset(info, 0, sizeof(*info)); 227 info->card = pcm->card->number; 228 info->device = pcm->device; 229 info->stream = substream->stream; 230 info->subdevice = substream->number; 231 strscpy(info->id, pcm->id, sizeof(info->id)); 232 strscpy(info->name, pcm->name, sizeof(info->name)); 233 info->dev_class = pcm->dev_class; 234 info->dev_subclass = pcm->dev_subclass; 235 info->subdevices_count = pstr->substream_count; 236 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 237 strscpy(info->subname, substream->name, sizeof(info->subname)); 238 239 return 0; 240 } 241 242 int snd_pcm_info_user(struct snd_pcm_substream *substream, 243 struct snd_pcm_info __user * _info) 244 { 245 int err; 246 struct snd_pcm_info *info __free(kfree) = 247 kmalloc(sizeof(*info), GFP_KERNEL); 248 249 if (! info) 250 return -ENOMEM; 251 err = snd_pcm_info(substream, info); 252 if (err >= 0) { 253 if (copy_to_user(_info, info, sizeof(*info))) 254 err = -EFAULT; 255 } 256 return err; 257 } 258 259 /* macro for simplified cast */ 260 #define PARAM_MASK_BIT(b) (1U << (__force int)(b)) 261 262 static bool hw_support_mmap(struct snd_pcm_substream *substream) 263 { 264 struct snd_dma_buffer *dmabuf; 265 266 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 267 return false; 268 269 if (substream->ops->mmap || substream->ops->page) 270 return true; 271 272 dmabuf = snd_pcm_get_dma_buf(substream); 273 if (!dmabuf) 274 dmabuf = &substream->dma_buffer; 275 switch (dmabuf->dev.type) { 276 case SNDRV_DMA_TYPE_UNKNOWN: 277 /* we can't know the device, so just assume that the driver does 278 * everything right 279 */ 280 return true; 281 case SNDRV_DMA_TYPE_CONTINUOUS: 282 case SNDRV_DMA_TYPE_VMALLOC: 283 return true; 284 default: 285 return dma_can_mmap(dmabuf->dev.dev); 286 } 287 } 288 289 static int constrain_mask_params(struct snd_pcm_substream *substream, 290 struct snd_pcm_hw_params *params) 291 { 292 struct snd_pcm_hw_constraints *constrs = 293 &substream->runtime->hw_constraints; 294 struct snd_mask *m; 295 unsigned int k; 296 struct snd_mask old_mask __maybe_unused; 297 int changed; 298 299 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 300 m = hw_param_mask(params, k); 301 if (snd_mask_empty(m)) 302 return -EINVAL; 303 304 /* This parameter is not requested to change by a caller. */ 305 if (!(params->rmask & PARAM_MASK_BIT(k))) 306 continue; 307 308 if (trace_hw_mask_param_enabled()) 309 old_mask = *m; 310 311 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 312 if (changed < 0) 313 return changed; 314 if (changed == 0) 315 continue; 316 317 /* Set corresponding flag so that the caller gets it. */ 318 trace_hw_mask_param(substream, k, 0, &old_mask, m); 319 params->cmask |= PARAM_MASK_BIT(k); 320 } 321 322 return 0; 323 } 324 325 static int constrain_interval_params(struct snd_pcm_substream *substream, 326 struct snd_pcm_hw_params *params) 327 { 328 struct snd_pcm_hw_constraints *constrs = 329 &substream->runtime->hw_constraints; 330 struct snd_interval *i; 331 unsigned int k; 332 struct snd_interval old_interval __maybe_unused; 333 int changed; 334 335 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 336 i = hw_param_interval(params, k); 337 if (snd_interval_empty(i)) 338 return -EINVAL; 339 340 /* This parameter is not requested to change by a caller. */ 341 if (!(params->rmask & PARAM_MASK_BIT(k))) 342 continue; 343 344 if (trace_hw_interval_param_enabled()) 345 old_interval = *i; 346 347 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 348 if (changed < 0) 349 return changed; 350 if (changed == 0) 351 continue; 352 353 /* Set corresponding flag so that the caller gets it. */ 354 trace_hw_interval_param(substream, k, 0, &old_interval, i); 355 params->cmask |= PARAM_MASK_BIT(k); 356 } 357 358 return 0; 359 } 360 361 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 362 struct snd_pcm_hw_params *params) 363 { 364 struct snd_pcm_hw_constraints *constrs = 365 &substream->runtime->hw_constraints; 366 unsigned int k; 367 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 368 unsigned int stamp; 369 struct snd_pcm_hw_rule *r; 370 unsigned int d; 371 struct snd_mask old_mask __maybe_unused; 372 struct snd_interval old_interval __maybe_unused; 373 bool again; 374 int changed, err = 0; 375 376 /* 377 * Each application of rule has own sequence number. 378 * 379 * Each member of 'rstamps' array represents the sequence number of 380 * recent application of corresponding rule. 381 */ 382 unsigned int *rstamps __free(kfree) = 383 kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 384 if (!rstamps) 385 return -ENOMEM; 386 387 /* 388 * Each member of 'vstamps' array represents the sequence number of 389 * recent application of rule in which corresponding parameters were 390 * changed. 391 * 392 * In initial state, elements corresponding to parameters requested by 393 * a caller is 1. For unrequested parameters, corresponding members 394 * have 0 so that the parameters are never changed anymore. 395 */ 396 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 397 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0; 398 399 /* Due to the above design, actual sequence number starts at 2. */ 400 stamp = 2; 401 retry: 402 /* Apply all rules in order. */ 403 again = false; 404 for (k = 0; k < constrs->rules_num; k++) { 405 r = &constrs->rules[k]; 406 407 /* 408 * Check condition bits of this rule. When the rule has 409 * some condition bits, parameter without the bits is 410 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 411 * is an example of the condition bits. 412 */ 413 if (r->cond && !(r->cond & params->flags)) 414 continue; 415 416 /* 417 * The 'deps' array includes maximum four dependencies 418 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth 419 * member of this array is a sentinel and should be 420 * negative value. 421 * 422 * This rule should be processed in this time when dependent 423 * parameters were changed at former applications of the other 424 * rules. 425 */ 426 for (d = 0; r->deps[d] >= 0; d++) { 427 if (vstamps[r->deps[d]] > rstamps[k]) 428 break; 429 } 430 if (r->deps[d] < 0) 431 continue; 432 433 if (trace_hw_mask_param_enabled()) { 434 if (hw_is_mask(r->var)) 435 old_mask = *hw_param_mask(params, r->var); 436 } 437 if (trace_hw_interval_param_enabled()) { 438 if (hw_is_interval(r->var)) 439 old_interval = *hw_param_interval(params, r->var); 440 } 441 442 changed = r->func(params, r); 443 if (changed < 0) 444 return changed; 445 446 /* 447 * When the parameter is changed, notify it to the caller 448 * by corresponding returned bit, then preparing for next 449 * iteration. 450 */ 451 if (changed && r->var >= 0) { 452 if (hw_is_mask(r->var)) { 453 trace_hw_mask_param(substream, r->var, 454 k + 1, &old_mask, 455 hw_param_mask(params, r->var)); 456 } 457 if (hw_is_interval(r->var)) { 458 trace_hw_interval_param(substream, r->var, 459 k + 1, &old_interval, 460 hw_param_interval(params, r->var)); 461 } 462 463 params->cmask |= PARAM_MASK_BIT(r->var); 464 vstamps[r->var] = stamp; 465 again = true; 466 } 467 468 rstamps[k] = stamp++; 469 } 470 471 /* Iterate to evaluate all rules till no parameters are changed. */ 472 if (again) 473 goto retry; 474 475 return err; 476 } 477 478 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 479 struct snd_pcm_hw_params *params) 480 { 481 const struct snd_interval *i; 482 const struct snd_mask *m; 483 struct snd_mask *m_rw; 484 int err; 485 486 if (!params->msbits) { 487 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 488 if (snd_interval_single(i)) 489 params->msbits = snd_interval_value(i); 490 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 491 if (snd_mask_single(m)) { 492 snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m); 493 params->msbits = snd_pcm_format_width(format); 494 } 495 } 496 497 if (params->msbits) { 498 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 499 if (snd_mask_single(m)) { 500 snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m); 501 502 if (snd_pcm_format_linear(format) && 503 snd_pcm_format_width(format) != params->msbits) { 504 m_rw = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT); 505 snd_mask_reset(m_rw, 506 (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX); 507 if (snd_mask_empty(m_rw)) 508 return -EINVAL; 509 } 510 } 511 } 512 513 if (!params->rate_den) { 514 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 515 if (snd_interval_single(i)) { 516 params->rate_num = snd_interval_value(i); 517 params->rate_den = 1; 518 } 519 } 520 521 if (!params->fifo_size) { 522 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 523 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 524 if (snd_mask_single(m) && snd_interval_single(i)) { 525 err = snd_pcm_ops_ioctl(substream, 526 SNDRV_PCM_IOCTL1_FIFO_SIZE, 527 params); 528 if (err < 0) 529 return err; 530 } 531 } 532 533 if (!params->info) { 534 params->info = substream->runtime->hw.info; 535 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 536 SNDRV_PCM_INFO_DRAIN_TRIGGER); 537 if (!hw_support_mmap(substream)) 538 params->info &= ~(SNDRV_PCM_INFO_MMAP | 539 SNDRV_PCM_INFO_MMAP_VALID); 540 } 541 542 err = snd_pcm_ops_ioctl(substream, 543 SNDRV_PCM_IOCTL1_SYNC_ID, 544 params); 545 if (err < 0) 546 return err; 547 548 return 0; 549 } 550 551 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 552 struct snd_pcm_hw_params *params) 553 { 554 int err; 555 556 params->info = 0; 557 params->fifo_size = 0; 558 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 559 params->msbits = 0; 560 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) { 561 params->rate_num = 0; 562 params->rate_den = 0; 563 } 564 565 err = constrain_mask_params(substream, params); 566 if (err < 0) 567 return err; 568 569 err = constrain_interval_params(substream, params); 570 if (err < 0) 571 return err; 572 573 err = constrain_params_by_rules(substream, params); 574 if (err < 0) 575 return err; 576 577 params->rmask = 0; 578 579 return 0; 580 } 581 EXPORT_SYMBOL(snd_pcm_hw_refine); 582 583 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 584 struct snd_pcm_hw_params __user * _params) 585 { 586 int err; 587 struct snd_pcm_hw_params *params __free(kfree) = 588 memdup_user(_params, sizeof(*params)); 589 590 if (IS_ERR(params)) 591 return PTR_ERR(params); 592 593 err = snd_pcm_hw_refine(substream, params); 594 if (err < 0) 595 return err; 596 597 err = fixup_unreferenced_params(substream, params); 598 if (err < 0) 599 return err; 600 601 if (copy_to_user(_params, params, sizeof(*params))) 602 return -EFAULT; 603 return 0; 604 } 605 606 static int period_to_usecs(struct snd_pcm_runtime *runtime) 607 { 608 int usecs; 609 610 if (! runtime->rate) 611 return -1; /* invalid */ 612 613 /* take 75% of period time as the deadline */ 614 usecs = (750000 / runtime->rate) * runtime->period_size; 615 usecs += ((750000 % runtime->rate) * runtime->period_size) / 616 runtime->rate; 617 618 return usecs; 619 } 620 621 static void snd_pcm_set_state(struct snd_pcm_substream *substream, 622 snd_pcm_state_t state) 623 { 624 guard(pcm_stream_lock_irq)(substream); 625 if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED) 626 __snd_pcm_set_state(substream->runtime, state); 627 } 628 629 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 630 int event) 631 { 632 #ifdef CONFIG_SND_PCM_TIMER 633 if (substream->timer) 634 snd_timer_notify(substream->timer, event, 635 &substream->runtime->trigger_tstamp); 636 #endif 637 } 638 639 void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq) 640 { 641 if (substream->runtime && substream->runtime->stop_operating) { 642 substream->runtime->stop_operating = false; 643 if (substream->ops && substream->ops->sync_stop) 644 substream->ops->sync_stop(substream); 645 else if (sync_irq && substream->pcm->card->sync_irq > 0) 646 synchronize_irq(substream->pcm->card->sync_irq); 647 } 648 } 649 650 /** 651 * snd_pcm_hw_params_choose - choose a configuration defined by @params 652 * @pcm: PCM instance 653 * @params: the hw_params instance 654 * 655 * Choose one configuration from configuration space defined by @params. 656 * The configuration chosen is that obtained fixing in this order: 657 * first access, first format, first subformat, min channels, 658 * min rate, min period time, max buffer size, min tick time 659 * 660 * Return: Zero if successful, or a negative error code on failure. 661 */ 662 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 663 struct snd_pcm_hw_params *params) 664 { 665 static const int vars[] = { 666 SNDRV_PCM_HW_PARAM_ACCESS, 667 SNDRV_PCM_HW_PARAM_FORMAT, 668 SNDRV_PCM_HW_PARAM_SUBFORMAT, 669 SNDRV_PCM_HW_PARAM_CHANNELS, 670 SNDRV_PCM_HW_PARAM_RATE, 671 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 672 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 673 SNDRV_PCM_HW_PARAM_TICK_TIME, 674 -1 675 }; 676 const int *v; 677 struct snd_mask old_mask __maybe_unused; 678 struct snd_interval old_interval __maybe_unused; 679 int changed; 680 681 for (v = vars; *v != -1; v++) { 682 /* Keep old parameter to trace. */ 683 if (trace_hw_mask_param_enabled()) { 684 if (hw_is_mask(*v)) 685 old_mask = *hw_param_mask(params, *v); 686 } 687 if (trace_hw_interval_param_enabled()) { 688 if (hw_is_interval(*v)) 689 old_interval = *hw_param_interval(params, *v); 690 } 691 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 692 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 693 else 694 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 695 if (changed < 0) 696 return changed; 697 if (changed == 0) 698 continue; 699 700 /* Trace the changed parameter. */ 701 if (hw_is_mask(*v)) { 702 trace_hw_mask_param(pcm, *v, 0, &old_mask, 703 hw_param_mask(params, *v)); 704 } 705 if (hw_is_interval(*v)) { 706 trace_hw_interval_param(pcm, *v, 0, &old_interval, 707 hw_param_interval(params, *v)); 708 } 709 } 710 711 return 0; 712 } 713 714 /* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise 715 * block the further r/w operations 716 */ 717 static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime) 718 { 719 if (!atomic_dec_unless_positive(&runtime->buffer_accessing)) 720 return -EBUSY; 721 mutex_lock(&runtime->buffer_mutex); 722 return 0; /* keep buffer_mutex, unlocked by below */ 723 } 724 725 /* release buffer_mutex and clear r/w access flag */ 726 static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime) 727 { 728 mutex_unlock(&runtime->buffer_mutex); 729 atomic_inc(&runtime->buffer_accessing); 730 } 731 732 /* fill the PCM buffer with the current silence format; called from pcm_oss.c */ 733 int snd_pcm_runtime_buffer_set_silence(struct snd_pcm_runtime *runtime) 734 { 735 int err; 736 737 err = snd_pcm_buffer_access_lock(runtime); 738 if (err < 0) 739 return err; 740 if (runtime->dma_area) 741 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, 742 bytes_to_samples(runtime, runtime->dma_bytes)); 743 snd_pcm_buffer_access_unlock(runtime); 744 return 0; 745 } 746 EXPORT_SYMBOL_GPL(snd_pcm_runtime_buffer_set_silence); 747 748 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 749 #define is_oss_stream(substream) ((substream)->oss.oss) 750 #else 751 #define is_oss_stream(substream) false 752 #endif 753 754 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 755 struct snd_pcm_hw_params *params) 756 { 757 struct snd_pcm_runtime *runtime; 758 int err, usecs; 759 unsigned int bits; 760 snd_pcm_uframes_t frames; 761 762 if (PCM_RUNTIME_CHECK(substream)) 763 return -ENXIO; 764 runtime = substream->runtime; 765 err = snd_pcm_buffer_access_lock(runtime); 766 if (err < 0) 767 return err; 768 scoped_guard(pcm_stream_lock_irq, substream) { 769 switch (runtime->state) { 770 case SNDRV_PCM_STATE_OPEN: 771 case SNDRV_PCM_STATE_SETUP: 772 case SNDRV_PCM_STATE_PREPARED: 773 if (!is_oss_stream(substream) && 774 atomic_read(&substream->mmap_count)) 775 err = -EBADFD; 776 break; 777 default: 778 err = -EBADFD; 779 break; 780 } 781 } 782 if (err) 783 goto unlock; 784 785 snd_pcm_sync_stop(substream, true); 786 787 params->rmask = ~0U; 788 err = snd_pcm_hw_refine(substream, params); 789 if (err < 0) 790 goto _error; 791 792 err = snd_pcm_hw_params_choose(substream, params); 793 if (err < 0) 794 goto _error; 795 796 err = fixup_unreferenced_params(substream, params); 797 if (err < 0) 798 goto _error; 799 800 if (substream->managed_buffer_alloc) { 801 err = snd_pcm_lib_malloc_pages(substream, 802 params_buffer_bytes(params)); 803 if (err < 0) 804 goto _error; 805 runtime->buffer_changed = err > 0; 806 } 807 808 if (substream->ops->hw_params != NULL) { 809 err = substream->ops->hw_params(substream, params); 810 if (err < 0) 811 goto _error; 812 } 813 814 runtime->access = params_access(params); 815 runtime->format = params_format(params); 816 runtime->subformat = params_subformat(params); 817 runtime->channels = params_channels(params); 818 runtime->rate = params_rate(params); 819 runtime->period_size = params_period_size(params); 820 runtime->periods = params_periods(params); 821 runtime->buffer_size = params_buffer_size(params); 822 runtime->info = params->info; 823 runtime->rate_num = params->rate_num; 824 runtime->rate_den = params->rate_den; 825 runtime->no_period_wakeup = 826 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 827 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 828 829 bits = snd_pcm_format_physical_width(runtime->format); 830 runtime->sample_bits = bits; 831 bits *= runtime->channels; 832 runtime->frame_bits = bits; 833 frames = 1; 834 while (bits % 8 != 0) { 835 bits *= 2; 836 frames *= 2; 837 } 838 runtime->byte_align = bits / 8; 839 runtime->min_align = frames; 840 841 /* Default sw params */ 842 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 843 runtime->period_step = 1; 844 runtime->control->avail_min = runtime->period_size; 845 runtime->start_threshold = 1; 846 runtime->stop_threshold = runtime->buffer_size; 847 runtime->silence_threshold = 0; 848 runtime->silence_size = 0; 849 runtime->boundary = runtime->buffer_size; 850 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 851 runtime->boundary *= 2; 852 853 /* clear the buffer for avoiding possible kernel info leaks */ 854 if (runtime->dma_area && !substream->ops->copy) { 855 size_t size = runtime->dma_bytes; 856 857 if (runtime->info & SNDRV_PCM_INFO_MMAP) 858 size = PAGE_ALIGN(size); 859 memset(runtime->dma_area, 0, size); 860 } 861 862 snd_pcm_timer_resolution_change(substream); 863 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 864 865 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 866 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 867 usecs = period_to_usecs(runtime); 868 if (usecs >= 0) 869 cpu_latency_qos_add_request(&substream->latency_pm_qos_req, 870 usecs); 871 err = 0; 872 _error: 873 if (err) { 874 /* hardware might be unusable from this time, 875 * so we force application to retry to set 876 * the correct hardware parameter settings 877 */ 878 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 879 if (substream->ops->hw_free != NULL) 880 substream->ops->hw_free(substream); 881 if (substream->managed_buffer_alloc) 882 snd_pcm_lib_free_pages(substream); 883 } 884 unlock: 885 snd_pcm_buffer_access_unlock(runtime); 886 return err; 887 } 888 889 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 890 struct snd_pcm_hw_params __user * _params) 891 { 892 int err; 893 struct snd_pcm_hw_params *params __free(kfree) = 894 memdup_user(_params, sizeof(*params)); 895 896 if (IS_ERR(params)) 897 return PTR_ERR(params); 898 899 err = snd_pcm_hw_params(substream, params); 900 if (err < 0) 901 return err; 902 903 if (copy_to_user(_params, params, sizeof(*params))) 904 return -EFAULT; 905 return err; 906 } 907 908 static int do_hw_free(struct snd_pcm_substream *substream) 909 { 910 int result = 0; 911 912 snd_pcm_sync_stop(substream, true); 913 if (substream->ops->hw_free) 914 result = substream->ops->hw_free(substream); 915 if (substream->managed_buffer_alloc) 916 snd_pcm_lib_free_pages(substream); 917 return result; 918 } 919 920 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 921 { 922 struct snd_pcm_runtime *runtime; 923 int result = 0; 924 925 if (PCM_RUNTIME_CHECK(substream)) 926 return -ENXIO; 927 runtime = substream->runtime; 928 result = snd_pcm_buffer_access_lock(runtime); 929 if (result < 0) 930 return result; 931 scoped_guard(pcm_stream_lock_irq, substream) { 932 switch (runtime->state) { 933 case SNDRV_PCM_STATE_SETUP: 934 case SNDRV_PCM_STATE_PREPARED: 935 if (atomic_read(&substream->mmap_count)) 936 result = -EBADFD; 937 break; 938 default: 939 result = -EBADFD; 940 break; 941 } 942 } 943 if (result) 944 goto unlock; 945 result = do_hw_free(substream); 946 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 947 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 948 unlock: 949 snd_pcm_buffer_access_unlock(runtime); 950 return result; 951 } 952 953 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 954 struct snd_pcm_sw_params *params) 955 { 956 struct snd_pcm_runtime *runtime; 957 int err; 958 959 if (PCM_RUNTIME_CHECK(substream)) 960 return -ENXIO; 961 runtime = substream->runtime; 962 scoped_guard(pcm_stream_lock_irq, substream) { 963 if (runtime->state == SNDRV_PCM_STATE_OPEN) 964 return -EBADFD; 965 } 966 967 if (params->tstamp_mode < 0 || 968 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 969 return -EINVAL; 970 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 971 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 972 return -EINVAL; 973 if (params->avail_min == 0) 974 return -EINVAL; 975 if (params->silence_size >= runtime->boundary) { 976 if (params->silence_threshold != 0) 977 return -EINVAL; 978 } else { 979 if (params->silence_size > params->silence_threshold) 980 return -EINVAL; 981 if (params->silence_threshold > runtime->buffer_size) 982 return -EINVAL; 983 } 984 err = 0; 985 scoped_guard(pcm_stream_lock_irq, substream) { 986 runtime->tstamp_mode = params->tstamp_mode; 987 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 988 runtime->tstamp_type = params->tstamp_type; 989 runtime->period_step = params->period_step; 990 runtime->control->avail_min = params->avail_min; 991 runtime->start_threshold = params->start_threshold; 992 runtime->stop_threshold = params->stop_threshold; 993 runtime->silence_threshold = params->silence_threshold; 994 runtime->silence_size = params->silence_size; 995 params->boundary = runtime->boundary; 996 if (snd_pcm_running(substream)) { 997 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 998 runtime->silence_size > 0) 999 snd_pcm_playback_silence(substream, ULONG_MAX); 1000 err = snd_pcm_update_state(substream, runtime); 1001 } 1002 } 1003 return err; 1004 } 1005 1006 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 1007 struct snd_pcm_sw_params __user * _params) 1008 { 1009 struct snd_pcm_sw_params params; 1010 int err; 1011 if (copy_from_user(¶ms, _params, sizeof(params))) 1012 return -EFAULT; 1013 err = snd_pcm_sw_params(substream, ¶ms); 1014 if (copy_to_user(_params, ¶ms, sizeof(params))) 1015 return -EFAULT; 1016 return err; 1017 } 1018 1019 static inline snd_pcm_uframes_t 1020 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 1021 { 1022 snd_pcm_uframes_t delay; 1023 1024 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1025 delay = snd_pcm_playback_hw_avail(substream->runtime); 1026 else 1027 delay = snd_pcm_capture_avail(substream->runtime); 1028 return delay + substream->runtime->delay; 1029 } 1030 1031 int snd_pcm_status64(struct snd_pcm_substream *substream, 1032 struct snd_pcm_status64 *status) 1033 { 1034 struct snd_pcm_runtime *runtime = substream->runtime; 1035 1036 guard(pcm_stream_lock_irq)(substream); 1037 1038 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 1039 &runtime->audio_tstamp_config); 1040 1041 /* backwards compatible behavior */ 1042 if (runtime->audio_tstamp_config.type_requested == 1043 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 1044 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 1045 runtime->audio_tstamp_config.type_requested = 1046 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 1047 else 1048 runtime->audio_tstamp_config.type_requested = 1049 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 1050 runtime->audio_tstamp_report.valid = 0; 1051 } else 1052 runtime->audio_tstamp_report.valid = 1; 1053 1054 status->state = runtime->state; 1055 status->suspended_state = runtime->suspended_state; 1056 if (status->state == SNDRV_PCM_STATE_OPEN) 1057 return 0; 1058 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec; 1059 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec; 1060 if (snd_pcm_running(substream)) { 1061 snd_pcm_update_hw_ptr(substream); 1062 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 1063 status->tstamp_sec = runtime->status->tstamp.tv_sec; 1064 status->tstamp_nsec = 1065 runtime->status->tstamp.tv_nsec; 1066 status->driver_tstamp_sec = 1067 runtime->driver_tstamp.tv_sec; 1068 status->driver_tstamp_nsec = 1069 runtime->driver_tstamp.tv_nsec; 1070 status->audio_tstamp_sec = 1071 runtime->status->audio_tstamp.tv_sec; 1072 status->audio_tstamp_nsec = 1073 runtime->status->audio_tstamp.tv_nsec; 1074 if (runtime->audio_tstamp_report.valid == 1) 1075 /* backwards compatibility, no report provided in COMPAT mode */ 1076 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 1077 &status->audio_tstamp_accuracy, 1078 &runtime->audio_tstamp_report); 1079 1080 goto _tstamp_end; 1081 } 1082 } else { 1083 /* get tstamp only in fallback mode and only if enabled */ 1084 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 1085 struct timespec64 tstamp; 1086 1087 snd_pcm_gettime(runtime, &tstamp); 1088 status->tstamp_sec = tstamp.tv_sec; 1089 status->tstamp_nsec = tstamp.tv_nsec; 1090 } 1091 } 1092 _tstamp_end: 1093 status->appl_ptr = runtime->control->appl_ptr; 1094 status->hw_ptr = runtime->status->hw_ptr; 1095 status->avail = snd_pcm_avail(substream); 1096 status->delay = snd_pcm_running(substream) ? 1097 snd_pcm_calc_delay(substream) : 0; 1098 status->avail_max = runtime->avail_max; 1099 status->overrange = runtime->overrange; 1100 runtime->avail_max = 0; 1101 runtime->overrange = 0; 1102 return 0; 1103 } 1104 1105 static int snd_pcm_status_user64(struct snd_pcm_substream *substream, 1106 struct snd_pcm_status64 __user * _status, 1107 bool ext) 1108 { 1109 struct snd_pcm_status64 status; 1110 int res; 1111 1112 memset(&status, 0, sizeof(status)); 1113 /* 1114 * with extension, parameters are read/write, 1115 * get audio_tstamp_data from user, 1116 * ignore rest of status structure 1117 */ 1118 if (ext && get_user(status.audio_tstamp_data, 1119 (u32 __user *)(&_status->audio_tstamp_data))) 1120 return -EFAULT; 1121 res = snd_pcm_status64(substream, &status); 1122 if (res < 0) 1123 return res; 1124 if (copy_to_user(_status, &status, sizeof(status))) 1125 return -EFAULT; 1126 return 0; 1127 } 1128 1129 static int snd_pcm_status_user32(struct snd_pcm_substream *substream, 1130 struct snd_pcm_status32 __user * _status, 1131 bool ext) 1132 { 1133 struct snd_pcm_status64 status64; 1134 struct snd_pcm_status32 status32; 1135 int res; 1136 1137 memset(&status64, 0, sizeof(status64)); 1138 memset(&status32, 0, sizeof(status32)); 1139 /* 1140 * with extension, parameters are read/write, 1141 * get audio_tstamp_data from user, 1142 * ignore rest of status structure 1143 */ 1144 if (ext && get_user(status64.audio_tstamp_data, 1145 (u32 __user *)(&_status->audio_tstamp_data))) 1146 return -EFAULT; 1147 res = snd_pcm_status64(substream, &status64); 1148 if (res < 0) 1149 return res; 1150 1151 status32 = (struct snd_pcm_status32) { 1152 .state = status64.state, 1153 .trigger_tstamp_sec = status64.trigger_tstamp_sec, 1154 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec, 1155 .tstamp_sec = status64.tstamp_sec, 1156 .tstamp_nsec = status64.tstamp_nsec, 1157 .appl_ptr = status64.appl_ptr, 1158 .hw_ptr = status64.hw_ptr, 1159 .delay = status64.delay, 1160 .avail = status64.avail, 1161 .avail_max = status64.avail_max, 1162 .overrange = status64.overrange, 1163 .suspended_state = status64.suspended_state, 1164 .audio_tstamp_data = status64.audio_tstamp_data, 1165 .audio_tstamp_sec = status64.audio_tstamp_sec, 1166 .audio_tstamp_nsec = status64.audio_tstamp_nsec, 1167 .driver_tstamp_sec = status64.audio_tstamp_sec, 1168 .driver_tstamp_nsec = status64.audio_tstamp_nsec, 1169 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy, 1170 }; 1171 1172 if (copy_to_user(_status, &status32, sizeof(status32))) 1173 return -EFAULT; 1174 1175 return 0; 1176 } 1177 1178 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 1179 struct snd_pcm_channel_info * info) 1180 { 1181 struct snd_pcm_runtime *runtime; 1182 unsigned int channel; 1183 1184 channel = info->channel; 1185 runtime = substream->runtime; 1186 scoped_guard(pcm_stream_lock_irq, substream) { 1187 if (runtime->state == SNDRV_PCM_STATE_OPEN) 1188 return -EBADFD; 1189 } 1190 if (channel >= runtime->channels) 1191 return -EINVAL; 1192 memset(info, 0, sizeof(*info)); 1193 info->channel = channel; 1194 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1195 } 1196 1197 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1198 struct snd_pcm_channel_info __user * _info) 1199 { 1200 struct snd_pcm_channel_info info; 1201 int res; 1202 1203 if (copy_from_user(&info, _info, sizeof(info))) 1204 return -EFAULT; 1205 res = snd_pcm_channel_info(substream, &info); 1206 if (res < 0) 1207 return res; 1208 if (copy_to_user(_info, &info, sizeof(info))) 1209 return -EFAULT; 1210 return 0; 1211 } 1212 1213 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1214 { 1215 struct snd_pcm_runtime *runtime = substream->runtime; 1216 if (runtime->trigger_master == NULL) 1217 return; 1218 if (runtime->trigger_master == substream) { 1219 if (!runtime->trigger_tstamp_latched) 1220 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1221 } else { 1222 snd_pcm_trigger_tstamp(runtime->trigger_master); 1223 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1224 } 1225 runtime->trigger_master = NULL; 1226 } 1227 1228 #define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0 1229 1230 struct action_ops { 1231 int (*pre_action)(struct snd_pcm_substream *substream, 1232 snd_pcm_state_t state); 1233 int (*do_action)(struct snd_pcm_substream *substream, 1234 snd_pcm_state_t state); 1235 void (*undo_action)(struct snd_pcm_substream *substream, 1236 snd_pcm_state_t state); 1237 void (*post_action)(struct snd_pcm_substream *substream, 1238 snd_pcm_state_t state); 1239 }; 1240 1241 /* 1242 * this functions is core for handling of linked stream 1243 * Note: the stream state might be changed also on failure 1244 * Note2: call with calling stream lock + link lock 1245 */ 1246 static int snd_pcm_action_group(const struct action_ops *ops, 1247 struct snd_pcm_substream *substream, 1248 snd_pcm_state_t state, 1249 bool stream_lock) 1250 { 1251 struct snd_pcm_substream *s = NULL; 1252 struct snd_pcm_substream *s1; 1253 int res = 0, depth = 1; 1254 1255 snd_pcm_group_for_each_entry(s, substream) { 1256 if (s != substream) { 1257 if (!stream_lock) 1258 mutex_lock_nested(&s->runtime->buffer_mutex, depth); 1259 else if (s->pcm->nonatomic) 1260 mutex_lock_nested(&s->self_group.mutex, depth); 1261 else 1262 spin_lock_nested(&s->self_group.lock, depth); 1263 depth++; 1264 } 1265 res = ops->pre_action(s, state); 1266 if (res < 0) 1267 goto _unlock; 1268 } 1269 snd_pcm_group_for_each_entry(s, substream) { 1270 res = ops->do_action(s, state); 1271 if (res < 0) { 1272 if (ops->undo_action) { 1273 snd_pcm_group_for_each_entry(s1, substream) { 1274 if (s1 == s) /* failed stream */ 1275 break; 1276 ops->undo_action(s1, state); 1277 } 1278 } 1279 s = NULL; /* unlock all */ 1280 goto _unlock; 1281 } 1282 } 1283 snd_pcm_group_for_each_entry(s, substream) { 1284 ops->post_action(s, state); 1285 } 1286 _unlock: 1287 /* unlock streams */ 1288 snd_pcm_group_for_each_entry(s1, substream) { 1289 if (s1 != substream) { 1290 if (!stream_lock) 1291 mutex_unlock(&s1->runtime->buffer_mutex); 1292 else if (s1->pcm->nonatomic) 1293 mutex_unlock(&s1->self_group.mutex); 1294 else 1295 spin_unlock(&s1->self_group.lock); 1296 } 1297 if (s1 == s) /* end */ 1298 break; 1299 } 1300 return res; 1301 } 1302 1303 /* 1304 * Note: call with stream lock 1305 */ 1306 static int snd_pcm_action_single(const struct action_ops *ops, 1307 struct snd_pcm_substream *substream, 1308 snd_pcm_state_t state) 1309 { 1310 int res; 1311 1312 res = ops->pre_action(substream, state); 1313 if (res < 0) 1314 return res; 1315 res = ops->do_action(substream, state); 1316 if (res == 0) 1317 ops->post_action(substream, state); 1318 else if (ops->undo_action) 1319 ops->undo_action(substream, state); 1320 return res; 1321 } 1322 1323 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1324 struct snd_pcm_group *new_group) 1325 { 1326 substream->group = new_group; 1327 list_move(&substream->link_list, &new_group->substreams); 1328 } 1329 1330 /* 1331 * Unref and unlock the group, but keep the stream lock; 1332 * when the group becomes empty and no longer referred, destroy itself 1333 */ 1334 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1335 struct snd_pcm_substream *substream) 1336 { 1337 bool do_free; 1338 1339 if (!group) 1340 return; 1341 do_free = refcount_dec_and_test(&group->refs); 1342 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1343 if (do_free) 1344 kfree(group); 1345 } 1346 1347 /* 1348 * Lock the group inside a stream lock and reference it; 1349 * return the locked group object, or NULL if not linked 1350 */ 1351 static struct snd_pcm_group * 1352 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1353 { 1354 bool nonatomic = substream->pcm->nonatomic; 1355 struct snd_pcm_group *group; 1356 bool trylock; 1357 1358 for (;;) { 1359 if (!snd_pcm_stream_linked(substream)) 1360 return NULL; 1361 group = substream->group; 1362 /* block freeing the group object */ 1363 refcount_inc(&group->refs); 1364 1365 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1366 spin_trylock(&group->lock); 1367 if (trylock) 1368 break; /* OK */ 1369 1370 /* re-lock for avoiding ABBA deadlock */ 1371 snd_pcm_stream_unlock(substream); 1372 snd_pcm_group_lock(group, nonatomic); 1373 snd_pcm_stream_lock(substream); 1374 1375 /* check the group again; the above opens a small race window */ 1376 if (substream->group == group) 1377 break; /* OK */ 1378 /* group changed, try again */ 1379 snd_pcm_group_unref(group, substream); 1380 } 1381 return group; 1382 } 1383 1384 /* 1385 * Note: call with stream lock 1386 */ 1387 static int snd_pcm_action(const struct action_ops *ops, 1388 struct snd_pcm_substream *substream, 1389 snd_pcm_state_t state) 1390 { 1391 struct snd_pcm_group *group; 1392 int res; 1393 1394 group = snd_pcm_stream_group_ref(substream); 1395 if (group) 1396 res = snd_pcm_action_group(ops, substream, state, true); 1397 else 1398 res = snd_pcm_action_single(ops, substream, state); 1399 snd_pcm_group_unref(group, substream); 1400 return res; 1401 } 1402 1403 /* 1404 * Note: don't use any locks before 1405 */ 1406 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1407 struct snd_pcm_substream *substream, 1408 snd_pcm_state_t state) 1409 { 1410 guard(pcm_stream_lock_irq)(substream); 1411 return snd_pcm_action(ops, substream, state); 1412 } 1413 1414 /* 1415 */ 1416 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1417 struct snd_pcm_substream *substream, 1418 snd_pcm_state_t state) 1419 { 1420 int res; 1421 1422 /* Guarantee the group members won't change during non-atomic action */ 1423 guard(rwsem_read)(&snd_pcm_link_rwsem); 1424 res = snd_pcm_buffer_access_lock(substream->runtime); 1425 if (res < 0) 1426 return res; 1427 if (snd_pcm_stream_linked(substream)) 1428 res = snd_pcm_action_group(ops, substream, state, false); 1429 else 1430 res = snd_pcm_action_single(ops, substream, state); 1431 snd_pcm_buffer_access_unlock(substream->runtime); 1432 return res; 1433 } 1434 1435 /* 1436 * start callbacks 1437 */ 1438 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, 1439 snd_pcm_state_t state) 1440 { 1441 struct snd_pcm_runtime *runtime = substream->runtime; 1442 if (runtime->state != SNDRV_PCM_STATE_PREPARED) 1443 return -EBADFD; 1444 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1445 !snd_pcm_playback_data(substream)) 1446 return -EPIPE; 1447 runtime->trigger_tstamp_latched = false; 1448 runtime->trigger_master = substream; 1449 return 0; 1450 } 1451 1452 static int snd_pcm_do_start(struct snd_pcm_substream *substream, 1453 snd_pcm_state_t state) 1454 { 1455 int err; 1456 1457 if (substream->runtime->trigger_master != substream) 1458 return 0; 1459 err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1460 /* XRUN happened during the start */ 1461 if (err == -EPIPE) 1462 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN); 1463 return err; 1464 } 1465 1466 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, 1467 snd_pcm_state_t state) 1468 { 1469 if (substream->runtime->trigger_master == substream) { 1470 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1471 substream->runtime->stop_operating = true; 1472 } 1473 } 1474 1475 static void snd_pcm_post_start(struct snd_pcm_substream *substream, 1476 snd_pcm_state_t state) 1477 { 1478 struct snd_pcm_runtime *runtime = substream->runtime; 1479 snd_pcm_trigger_tstamp(substream); 1480 runtime->hw_ptr_jiffies = jiffies; 1481 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1482 runtime->rate; 1483 __snd_pcm_set_state(runtime, state); 1484 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1485 runtime->silence_size > 0) 1486 snd_pcm_playback_silence(substream, ULONG_MAX); 1487 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1488 } 1489 1490 static const struct action_ops snd_pcm_action_start = { 1491 .pre_action = snd_pcm_pre_start, 1492 .do_action = snd_pcm_do_start, 1493 .undo_action = snd_pcm_undo_start, 1494 .post_action = snd_pcm_post_start 1495 }; 1496 1497 /** 1498 * snd_pcm_start - start all linked streams 1499 * @substream: the PCM substream instance 1500 * 1501 * Return: Zero if successful, or a negative error code. 1502 * The stream lock must be acquired before calling this function. 1503 */ 1504 int snd_pcm_start(struct snd_pcm_substream *substream) 1505 { 1506 return snd_pcm_action(&snd_pcm_action_start, substream, 1507 SNDRV_PCM_STATE_RUNNING); 1508 } 1509 1510 /* take the stream lock and start the streams */ 1511 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1512 { 1513 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1514 SNDRV_PCM_STATE_RUNNING); 1515 } 1516 1517 /* 1518 * stop callbacks 1519 */ 1520 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, 1521 snd_pcm_state_t state) 1522 { 1523 struct snd_pcm_runtime *runtime = substream->runtime; 1524 if (runtime->state == SNDRV_PCM_STATE_OPEN) 1525 return -EBADFD; 1526 runtime->trigger_master = substream; 1527 return 0; 1528 } 1529 1530 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, 1531 snd_pcm_state_t state) 1532 { 1533 if (substream->runtime->trigger_master == substream && 1534 snd_pcm_running(substream)) { 1535 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1536 substream->runtime->stop_operating = true; 1537 } 1538 return 0; /* unconditionally stop all substreams */ 1539 } 1540 1541 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, 1542 snd_pcm_state_t state) 1543 { 1544 struct snd_pcm_runtime *runtime = substream->runtime; 1545 if (runtime->state != state) { 1546 snd_pcm_trigger_tstamp(substream); 1547 __snd_pcm_set_state(runtime, state); 1548 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1549 } 1550 wake_up(&runtime->sleep); 1551 wake_up(&runtime->tsleep); 1552 } 1553 1554 static const struct action_ops snd_pcm_action_stop = { 1555 .pre_action = snd_pcm_pre_stop, 1556 .do_action = snd_pcm_do_stop, 1557 .post_action = snd_pcm_post_stop 1558 }; 1559 1560 /** 1561 * snd_pcm_stop - try to stop all running streams in the substream group 1562 * @substream: the PCM substream instance 1563 * @state: PCM state after stopping the stream 1564 * 1565 * The state of each stream is then changed to the given state unconditionally. 1566 * 1567 * Return: Zero if successful, or a negative error code. 1568 */ 1569 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1570 { 1571 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1572 } 1573 EXPORT_SYMBOL(snd_pcm_stop); 1574 1575 /** 1576 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1577 * @substream: the PCM substream 1578 * 1579 * After stopping, the state is changed to SETUP. 1580 * Unlike snd_pcm_stop(), this affects only the given stream. 1581 * 1582 * Return: Zero if successful, or a negative error code. 1583 */ 1584 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1585 { 1586 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1587 SNDRV_PCM_STATE_SETUP); 1588 } 1589 1590 /** 1591 * snd_pcm_stop_xrun - stop the running streams as XRUN 1592 * @substream: the PCM substream instance 1593 * 1594 * This stops the given running substream (and all linked substreams) as XRUN. 1595 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1596 * 1597 * Return: Zero if successful, or a negative error code. 1598 */ 1599 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1600 { 1601 guard(pcm_stream_lock_irqsave)(substream); 1602 if (substream->runtime && snd_pcm_running(substream)) 1603 __snd_pcm_xrun(substream); 1604 return 0; 1605 } 1606 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1607 1608 /* 1609 * pause callbacks: pass boolean (to start pause or resume) as state argument 1610 */ 1611 #define pause_pushed(state) (__force bool)(state) 1612 1613 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, 1614 snd_pcm_state_t state) 1615 { 1616 struct snd_pcm_runtime *runtime = substream->runtime; 1617 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1618 return -ENOSYS; 1619 if (pause_pushed(state)) { 1620 if (runtime->state != SNDRV_PCM_STATE_RUNNING) 1621 return -EBADFD; 1622 } else if (runtime->state != SNDRV_PCM_STATE_PAUSED) 1623 return -EBADFD; 1624 runtime->trigger_master = substream; 1625 return 0; 1626 } 1627 1628 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, 1629 snd_pcm_state_t state) 1630 { 1631 if (substream->runtime->trigger_master != substream) 1632 return 0; 1633 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1634 * a delta between the current jiffies, this gives a large enough 1635 * delta, effectively to skip the check once. 1636 */ 1637 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1638 return substream->ops->trigger(substream, 1639 pause_pushed(state) ? 1640 SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1641 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1642 } 1643 1644 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, 1645 snd_pcm_state_t state) 1646 { 1647 if (substream->runtime->trigger_master == substream) 1648 substream->ops->trigger(substream, 1649 pause_pushed(state) ? 1650 SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1651 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1652 } 1653 1654 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, 1655 snd_pcm_state_t state) 1656 { 1657 struct snd_pcm_runtime *runtime = substream->runtime; 1658 snd_pcm_trigger_tstamp(substream); 1659 if (pause_pushed(state)) { 1660 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED); 1661 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1662 wake_up(&runtime->sleep); 1663 wake_up(&runtime->tsleep); 1664 } else { 1665 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING); 1666 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1667 } 1668 } 1669 1670 static const struct action_ops snd_pcm_action_pause = { 1671 .pre_action = snd_pcm_pre_pause, 1672 .do_action = snd_pcm_do_pause, 1673 .undo_action = snd_pcm_undo_pause, 1674 .post_action = snd_pcm_post_pause 1675 }; 1676 1677 /* 1678 * Push/release the pause for all linked streams. 1679 */ 1680 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push) 1681 { 1682 return snd_pcm_action(&snd_pcm_action_pause, substream, 1683 (__force snd_pcm_state_t)push); 1684 } 1685 1686 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream, 1687 bool push) 1688 { 1689 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream, 1690 (__force snd_pcm_state_t)push); 1691 } 1692 1693 #ifdef CONFIG_PM 1694 /* suspend callback: state argument ignored */ 1695 1696 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, 1697 snd_pcm_state_t state) 1698 { 1699 struct snd_pcm_runtime *runtime = substream->runtime; 1700 switch (runtime->state) { 1701 case SNDRV_PCM_STATE_SUSPENDED: 1702 return -EBUSY; 1703 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1704 case SNDRV_PCM_STATE_OPEN: 1705 case SNDRV_PCM_STATE_SETUP: 1706 case SNDRV_PCM_STATE_DISCONNECTED: 1707 return -EBUSY; 1708 } 1709 runtime->trigger_master = substream; 1710 return 0; 1711 } 1712 1713 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, 1714 snd_pcm_state_t state) 1715 { 1716 struct snd_pcm_runtime *runtime = substream->runtime; 1717 if (runtime->trigger_master != substream) 1718 return 0; 1719 if (! snd_pcm_running(substream)) 1720 return 0; 1721 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1722 runtime->stop_operating = true; 1723 return 0; /* suspend unconditionally */ 1724 } 1725 1726 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, 1727 snd_pcm_state_t state) 1728 { 1729 struct snd_pcm_runtime *runtime = substream->runtime; 1730 snd_pcm_trigger_tstamp(substream); 1731 runtime->suspended_state = runtime->state; 1732 runtime->status->suspended_state = runtime->suspended_state; 1733 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED); 1734 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1735 wake_up(&runtime->sleep); 1736 wake_up(&runtime->tsleep); 1737 } 1738 1739 static const struct action_ops snd_pcm_action_suspend = { 1740 .pre_action = snd_pcm_pre_suspend, 1741 .do_action = snd_pcm_do_suspend, 1742 .post_action = snd_pcm_post_suspend 1743 }; 1744 1745 /* 1746 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1747 * @substream: the PCM substream 1748 * 1749 * After this call, all streams are changed to SUSPENDED state. 1750 * 1751 * Return: Zero if successful, or a negative error code. 1752 */ 1753 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1754 { 1755 guard(pcm_stream_lock_irqsave)(substream); 1756 return snd_pcm_action(&snd_pcm_action_suspend, substream, 1757 ACTION_ARG_IGNORE); 1758 } 1759 1760 /** 1761 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1762 * @pcm: the PCM instance 1763 * 1764 * After this call, all streams are changed to SUSPENDED state. 1765 * 1766 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1767 */ 1768 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1769 { 1770 struct snd_pcm_substream *substream; 1771 int stream, err = 0; 1772 1773 if (! pcm) 1774 return 0; 1775 1776 for_each_pcm_substream(pcm, stream, substream) { 1777 /* FIXME: the open/close code should lock this as well */ 1778 if (!substream->runtime) 1779 continue; 1780 1781 /* 1782 * Skip BE dai link PCM's that are internal and may 1783 * not have their substream ops set. 1784 */ 1785 if (!substream->ops) 1786 continue; 1787 1788 err = snd_pcm_suspend(substream); 1789 if (err < 0 && err != -EBUSY) 1790 return err; 1791 } 1792 1793 for_each_pcm_substream(pcm, stream, substream) 1794 snd_pcm_sync_stop(substream, false); 1795 1796 return 0; 1797 } 1798 EXPORT_SYMBOL(snd_pcm_suspend_all); 1799 1800 /* resume callbacks: state argument ignored */ 1801 1802 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, 1803 snd_pcm_state_t state) 1804 { 1805 struct snd_pcm_runtime *runtime = substream->runtime; 1806 if (runtime->state != SNDRV_PCM_STATE_SUSPENDED) 1807 return -EBADFD; 1808 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1809 return -ENOSYS; 1810 runtime->trigger_master = substream; 1811 return 0; 1812 } 1813 1814 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, 1815 snd_pcm_state_t state) 1816 { 1817 struct snd_pcm_runtime *runtime = substream->runtime; 1818 if (runtime->trigger_master != substream) 1819 return 0; 1820 /* DMA not running previously? */ 1821 if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING && 1822 (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING || 1823 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1824 return 0; 1825 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1826 } 1827 1828 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, 1829 snd_pcm_state_t state) 1830 { 1831 if (substream->runtime->trigger_master == substream && 1832 snd_pcm_running(substream)) 1833 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1834 } 1835 1836 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, 1837 snd_pcm_state_t state) 1838 { 1839 struct snd_pcm_runtime *runtime = substream->runtime; 1840 snd_pcm_trigger_tstamp(substream); 1841 __snd_pcm_set_state(runtime, runtime->suspended_state); 1842 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1843 } 1844 1845 static const struct action_ops snd_pcm_action_resume = { 1846 .pre_action = snd_pcm_pre_resume, 1847 .do_action = snd_pcm_do_resume, 1848 .undo_action = snd_pcm_undo_resume, 1849 .post_action = snd_pcm_post_resume 1850 }; 1851 1852 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1853 { 1854 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 1855 ACTION_ARG_IGNORE); 1856 } 1857 1858 #else 1859 1860 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1861 { 1862 return -ENOSYS; 1863 } 1864 1865 #endif /* CONFIG_PM */ 1866 1867 /* 1868 * xrun ioctl 1869 * 1870 * Change the RUNNING stream(s) to XRUN state. 1871 */ 1872 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1873 { 1874 struct snd_pcm_runtime *runtime = substream->runtime; 1875 1876 guard(pcm_stream_lock_irq)(substream); 1877 switch (runtime->state) { 1878 case SNDRV_PCM_STATE_XRUN: 1879 return 0; /* already there */ 1880 case SNDRV_PCM_STATE_RUNNING: 1881 __snd_pcm_xrun(substream); 1882 return 0; 1883 default: 1884 return -EBADFD; 1885 } 1886 } 1887 1888 /* 1889 * reset ioctl 1890 */ 1891 /* reset callbacks: state argument ignored */ 1892 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, 1893 snd_pcm_state_t state) 1894 { 1895 struct snd_pcm_runtime *runtime = substream->runtime; 1896 switch (runtime->state) { 1897 case SNDRV_PCM_STATE_RUNNING: 1898 case SNDRV_PCM_STATE_PREPARED: 1899 case SNDRV_PCM_STATE_PAUSED: 1900 case SNDRV_PCM_STATE_SUSPENDED: 1901 return 0; 1902 default: 1903 return -EBADFD; 1904 } 1905 } 1906 1907 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, 1908 snd_pcm_state_t state) 1909 { 1910 struct snd_pcm_runtime *runtime = substream->runtime; 1911 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1912 if (err < 0) 1913 return err; 1914 guard(pcm_stream_lock_irq)(substream); 1915 runtime->hw_ptr_base = 0; 1916 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1917 runtime->status->hw_ptr % runtime->period_size; 1918 runtime->silence_start = runtime->status->hw_ptr; 1919 runtime->silence_filled = 0; 1920 return 0; 1921 } 1922 1923 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, 1924 snd_pcm_state_t state) 1925 { 1926 struct snd_pcm_runtime *runtime = substream->runtime; 1927 guard(pcm_stream_lock_irq)(substream); 1928 runtime->control->appl_ptr = runtime->status->hw_ptr; 1929 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1930 runtime->silence_size > 0) 1931 snd_pcm_playback_silence(substream, ULONG_MAX); 1932 } 1933 1934 static const struct action_ops snd_pcm_action_reset = { 1935 .pre_action = snd_pcm_pre_reset, 1936 .do_action = snd_pcm_do_reset, 1937 .post_action = snd_pcm_post_reset 1938 }; 1939 1940 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1941 { 1942 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 1943 ACTION_ARG_IGNORE); 1944 } 1945 1946 /* 1947 * prepare ioctl 1948 */ 1949 /* pass f_flags as state argument */ 1950 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1951 snd_pcm_state_t state) 1952 { 1953 struct snd_pcm_runtime *runtime = substream->runtime; 1954 int f_flags = (__force int)state; 1955 1956 if (runtime->state == SNDRV_PCM_STATE_OPEN || 1957 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 1958 return -EBADFD; 1959 if (snd_pcm_running(substream)) 1960 return -EBUSY; 1961 substream->f_flags = f_flags; 1962 return 0; 1963 } 1964 1965 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, 1966 snd_pcm_state_t state) 1967 { 1968 int err; 1969 snd_pcm_sync_stop(substream, true); 1970 err = substream->ops->prepare(substream); 1971 if (err < 0) 1972 return err; 1973 return snd_pcm_do_reset(substream, state); 1974 } 1975 1976 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, 1977 snd_pcm_state_t state) 1978 { 1979 struct snd_pcm_runtime *runtime = substream->runtime; 1980 runtime->control->appl_ptr = runtime->status->hw_ptr; 1981 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1982 } 1983 1984 static const struct action_ops snd_pcm_action_prepare = { 1985 .pre_action = snd_pcm_pre_prepare, 1986 .do_action = snd_pcm_do_prepare, 1987 .post_action = snd_pcm_post_prepare 1988 }; 1989 1990 /** 1991 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1992 * @substream: the PCM substream instance 1993 * @file: file to refer f_flags 1994 * 1995 * Return: Zero if successful, or a negative error code. 1996 */ 1997 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1998 struct file *file) 1999 { 2000 int f_flags; 2001 2002 if (file) 2003 f_flags = file->f_flags; 2004 else 2005 f_flags = substream->f_flags; 2006 2007 scoped_guard(pcm_stream_lock_irq, substream) { 2008 switch (substream->runtime->state) { 2009 case SNDRV_PCM_STATE_PAUSED: 2010 snd_pcm_pause(substream, false); 2011 fallthrough; 2012 case SNDRV_PCM_STATE_SUSPENDED: 2013 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2014 break; 2015 } 2016 } 2017 2018 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 2019 substream, 2020 (__force snd_pcm_state_t)f_flags); 2021 } 2022 2023 /* 2024 * drain ioctl 2025 */ 2026 2027 /* drain init callbacks: state argument ignored */ 2028 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, 2029 snd_pcm_state_t state) 2030 { 2031 struct snd_pcm_runtime *runtime = substream->runtime; 2032 switch (runtime->state) { 2033 case SNDRV_PCM_STATE_OPEN: 2034 case SNDRV_PCM_STATE_DISCONNECTED: 2035 case SNDRV_PCM_STATE_SUSPENDED: 2036 return -EBADFD; 2037 } 2038 runtime->trigger_master = substream; 2039 return 0; 2040 } 2041 2042 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, 2043 snd_pcm_state_t state) 2044 { 2045 struct snd_pcm_runtime *runtime = substream->runtime; 2046 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 2047 switch (runtime->state) { 2048 case SNDRV_PCM_STATE_PREPARED: 2049 /* start playback stream if possible */ 2050 if (! snd_pcm_playback_empty(substream)) { 2051 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 2052 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 2053 } else { 2054 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP); 2055 } 2056 break; 2057 case SNDRV_PCM_STATE_RUNNING: 2058 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING); 2059 break; 2060 case SNDRV_PCM_STATE_XRUN: 2061 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP); 2062 break; 2063 default: 2064 break; 2065 } 2066 } else { 2067 /* stop running stream */ 2068 if (runtime->state == SNDRV_PCM_STATE_RUNNING) { 2069 snd_pcm_state_t new_state; 2070 2071 new_state = snd_pcm_capture_avail(runtime) > 0 ? 2072 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 2073 snd_pcm_do_stop(substream, new_state); 2074 snd_pcm_post_stop(substream, new_state); 2075 } 2076 } 2077 2078 if (runtime->state == SNDRV_PCM_STATE_DRAINING && 2079 runtime->trigger_master == substream && 2080 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 2081 return substream->ops->trigger(substream, 2082 SNDRV_PCM_TRIGGER_DRAIN); 2083 2084 return 0; 2085 } 2086 2087 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, 2088 snd_pcm_state_t state) 2089 { 2090 } 2091 2092 static const struct action_ops snd_pcm_action_drain_init = { 2093 .pre_action = snd_pcm_pre_drain_init, 2094 .do_action = snd_pcm_do_drain_init, 2095 .post_action = snd_pcm_post_drain_init 2096 }; 2097 2098 /* 2099 * Drain the stream(s). 2100 * When the substream is linked, sync until the draining of all playback streams 2101 * is finished. 2102 * After this call, all streams are supposed to be either SETUP or DRAINING 2103 * (capture only) state. 2104 */ 2105 static int snd_pcm_drain(struct snd_pcm_substream *substream, 2106 struct file *file) 2107 { 2108 struct snd_card *card; 2109 struct snd_pcm_runtime *runtime; 2110 struct snd_pcm_substream *s; 2111 struct snd_pcm_group *group; 2112 wait_queue_entry_t wait; 2113 int result = 0; 2114 int nonblock = 0; 2115 2116 card = substream->pcm->card; 2117 runtime = substream->runtime; 2118 2119 if (runtime->state == SNDRV_PCM_STATE_OPEN) 2120 return -EBADFD; 2121 2122 if (file) { 2123 if (file->f_flags & O_NONBLOCK) 2124 nonblock = 1; 2125 } else if (substream->f_flags & O_NONBLOCK) 2126 nonblock = 1; 2127 2128 snd_pcm_stream_lock_irq(substream); 2129 /* resume pause */ 2130 if (runtime->state == SNDRV_PCM_STATE_PAUSED) 2131 snd_pcm_pause(substream, false); 2132 2133 /* pre-start/stop - all running streams are changed to DRAINING state */ 2134 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 2135 ACTION_ARG_IGNORE); 2136 if (result < 0) 2137 goto unlock; 2138 /* in non-blocking, we don't wait in ioctl but let caller poll */ 2139 if (nonblock) { 2140 result = -EAGAIN; 2141 goto unlock; 2142 } 2143 2144 for (;;) { 2145 long tout; 2146 struct snd_pcm_runtime *to_check; 2147 if (signal_pending(current)) { 2148 result = -ERESTARTSYS; 2149 break; 2150 } 2151 /* find a substream to drain */ 2152 to_check = NULL; 2153 group = snd_pcm_stream_group_ref(substream); 2154 snd_pcm_group_for_each_entry(s, substream) { 2155 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 2156 continue; 2157 runtime = s->runtime; 2158 if (runtime->state == SNDRV_PCM_STATE_DRAINING) { 2159 to_check = runtime; 2160 break; 2161 } 2162 } 2163 snd_pcm_group_unref(group, substream); 2164 if (!to_check) 2165 break; /* all drained */ 2166 init_waitqueue_entry(&wait, current); 2167 set_current_state(TASK_INTERRUPTIBLE); 2168 add_wait_queue(&to_check->sleep, &wait); 2169 snd_pcm_stream_unlock_irq(substream); 2170 if (runtime->no_period_wakeup) 2171 tout = MAX_SCHEDULE_TIMEOUT; 2172 else { 2173 tout = 100; 2174 if (runtime->rate) { 2175 long t = runtime->buffer_size * 1100 / runtime->rate; 2176 tout = max(t, tout); 2177 } 2178 tout = msecs_to_jiffies(tout); 2179 } 2180 tout = schedule_timeout(tout); 2181 2182 snd_pcm_stream_lock_irq(substream); 2183 group = snd_pcm_stream_group_ref(substream); 2184 snd_pcm_group_for_each_entry(s, substream) { 2185 if (s->runtime == to_check) { 2186 remove_wait_queue(&to_check->sleep, &wait); 2187 break; 2188 } 2189 } 2190 snd_pcm_group_unref(group, substream); 2191 2192 if (card->shutdown) { 2193 result = -ENODEV; 2194 break; 2195 } 2196 if (tout == 0) { 2197 if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED) 2198 result = -ESTRPIPE; 2199 else { 2200 dev_dbg(substream->pcm->card->dev, 2201 "playback drain timeout (DMA or IRQ trouble?)\n"); 2202 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2203 result = -EIO; 2204 } 2205 break; 2206 } 2207 } 2208 2209 unlock: 2210 snd_pcm_stream_unlock_irq(substream); 2211 2212 return result; 2213 } 2214 2215 /* 2216 * drop ioctl 2217 * 2218 * Immediately put all linked substreams into SETUP state. 2219 */ 2220 static int snd_pcm_drop(struct snd_pcm_substream *substream) 2221 { 2222 struct snd_pcm_runtime *runtime; 2223 int result = 0; 2224 2225 if (PCM_RUNTIME_CHECK(substream)) 2226 return -ENXIO; 2227 runtime = substream->runtime; 2228 2229 if (runtime->state == SNDRV_PCM_STATE_OPEN || 2230 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 2231 return -EBADFD; 2232 2233 guard(pcm_stream_lock_irq)(substream); 2234 /* resume pause */ 2235 if (runtime->state == SNDRV_PCM_STATE_PAUSED) 2236 snd_pcm_pause(substream, false); 2237 2238 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2239 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 2240 2241 return result; 2242 } 2243 2244 2245 static bool is_pcm_file(struct file *file) 2246 { 2247 struct inode *inode = file_inode(file); 2248 struct snd_pcm *pcm; 2249 unsigned int minor; 2250 2251 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2252 return false; 2253 minor = iminor(inode); 2254 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2255 if (!pcm) 2256 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2257 if (!pcm) 2258 return false; 2259 snd_card_unref(pcm->card); 2260 return true; 2261 } 2262 2263 /* 2264 * PCM link handling 2265 */ 2266 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2267 { 2268 struct snd_pcm_file *pcm_file; 2269 struct snd_pcm_substream *substream1; 2270 struct snd_pcm_group *target_group; 2271 bool nonatomic = substream->pcm->nonatomic; 2272 CLASS(fd, f)(fd); 2273 2274 if (fd_empty(f)) 2275 return -EBADFD; 2276 if (!is_pcm_file(fd_file(f))) 2277 return -EBADFD; 2278 2279 pcm_file = fd_file(f)->private_data; 2280 substream1 = pcm_file->substream; 2281 2282 if (substream == substream1) 2283 return -EINVAL; 2284 2285 struct snd_pcm_group *group __free(kfree) = 2286 kzalloc(sizeof(*group), GFP_KERNEL); 2287 if (!group) 2288 return -ENOMEM; 2289 snd_pcm_group_init(group); 2290 2291 guard(rwsem_write)(&snd_pcm_link_rwsem); 2292 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN || 2293 substream->runtime->state != substream1->runtime->state || 2294 substream->pcm->nonatomic != substream1->pcm->nonatomic) 2295 return -EBADFD; 2296 if (snd_pcm_stream_linked(substream1)) 2297 return -EALREADY; 2298 2299 scoped_guard(pcm_stream_lock_irq, substream) { 2300 if (!snd_pcm_stream_linked(substream)) { 2301 snd_pcm_group_assign(substream, group); 2302 group = NULL; /* assigned, don't free this one below */ 2303 } 2304 target_group = substream->group; 2305 } 2306 2307 snd_pcm_group_lock_irq(target_group, nonatomic); 2308 snd_pcm_stream_lock_nested(substream1); 2309 snd_pcm_group_assign(substream1, target_group); 2310 refcount_inc(&target_group->refs); 2311 snd_pcm_stream_unlock(substream1); 2312 snd_pcm_group_unlock_irq(target_group, nonatomic); 2313 return 0; 2314 } 2315 2316 static void relink_to_local(struct snd_pcm_substream *substream) 2317 { 2318 snd_pcm_stream_lock_nested(substream); 2319 snd_pcm_group_assign(substream, &substream->self_group); 2320 snd_pcm_stream_unlock(substream); 2321 } 2322 2323 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2324 { 2325 struct snd_pcm_group *group; 2326 bool nonatomic = substream->pcm->nonatomic; 2327 bool do_free = false; 2328 2329 guard(rwsem_write)(&snd_pcm_link_rwsem); 2330 2331 if (!snd_pcm_stream_linked(substream)) 2332 return -EALREADY; 2333 2334 group = substream->group; 2335 snd_pcm_group_lock_irq(group, nonatomic); 2336 2337 relink_to_local(substream); 2338 refcount_dec(&group->refs); 2339 2340 /* detach the last stream, too */ 2341 if (list_is_singular(&group->substreams)) { 2342 relink_to_local(list_first_entry(&group->substreams, 2343 struct snd_pcm_substream, 2344 link_list)); 2345 do_free = refcount_dec_and_test(&group->refs); 2346 } 2347 2348 snd_pcm_group_unlock_irq(group, nonatomic); 2349 if (do_free) 2350 kfree(group); 2351 return 0; 2352 } 2353 2354 /* 2355 * hw configurator 2356 */ 2357 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2358 struct snd_pcm_hw_rule *rule) 2359 { 2360 struct snd_interval t; 2361 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2362 hw_param_interval_c(params, rule->deps[1]), &t); 2363 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2364 } 2365 2366 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2367 struct snd_pcm_hw_rule *rule) 2368 { 2369 struct snd_interval t; 2370 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2371 hw_param_interval_c(params, rule->deps[1]), &t); 2372 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2373 } 2374 2375 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2376 struct snd_pcm_hw_rule *rule) 2377 { 2378 struct snd_interval t; 2379 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2380 hw_param_interval_c(params, rule->deps[1]), 2381 (unsigned long) rule->private, &t); 2382 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2383 } 2384 2385 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2386 struct snd_pcm_hw_rule *rule) 2387 { 2388 struct snd_interval t; 2389 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2390 (unsigned long) rule->private, 2391 hw_param_interval_c(params, rule->deps[1]), &t); 2392 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2393 } 2394 2395 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2396 struct snd_pcm_hw_rule *rule) 2397 { 2398 snd_pcm_format_t k; 2399 const struct snd_interval *i = 2400 hw_param_interval_c(params, rule->deps[0]); 2401 struct snd_mask m; 2402 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2403 snd_mask_any(&m); 2404 pcm_for_each_format(k) { 2405 int bits; 2406 if (!snd_mask_test_format(mask, k)) 2407 continue; 2408 bits = snd_pcm_format_physical_width(k); 2409 if (bits <= 0) 2410 continue; /* ignore invalid formats */ 2411 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2412 snd_mask_reset(&m, (__force unsigned)k); 2413 } 2414 return snd_mask_refine(mask, &m); 2415 } 2416 2417 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2418 struct snd_pcm_hw_rule *rule) 2419 { 2420 struct snd_interval t; 2421 snd_pcm_format_t k; 2422 2423 t.min = UINT_MAX; 2424 t.max = 0; 2425 t.openmin = 0; 2426 t.openmax = 0; 2427 pcm_for_each_format(k) { 2428 int bits; 2429 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2430 continue; 2431 bits = snd_pcm_format_physical_width(k); 2432 if (bits <= 0) 2433 continue; /* ignore invalid formats */ 2434 if (t.min > (unsigned)bits) 2435 t.min = bits; 2436 if (t.max < (unsigned)bits) 2437 t.max = bits; 2438 } 2439 t.integer = 1; 2440 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2441 } 2442 2443 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 ||\ 2444 SNDRV_PCM_RATE_128000 != 1 << 19 2445 #error "Change this table" 2446 #endif 2447 2448 /* NOTE: the list is unsorted! */ 2449 static const unsigned int rates[] = { 2450 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2451 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000, 2452 /* extended */ 2453 12000, 24000, 128000 2454 }; 2455 2456 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2457 .count = ARRAY_SIZE(rates), 2458 .list = rates, 2459 }; 2460 2461 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2462 struct snd_pcm_hw_rule *rule) 2463 { 2464 struct snd_pcm_hardware *hw = rule->private; 2465 return snd_interval_list(hw_param_interval(params, rule->var), 2466 snd_pcm_known_rates.count, 2467 snd_pcm_known_rates.list, hw->rates); 2468 } 2469 2470 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2471 struct snd_pcm_hw_rule *rule) 2472 { 2473 struct snd_interval t; 2474 struct snd_pcm_substream *substream = rule->private; 2475 t.min = 0; 2476 t.max = substream->buffer_bytes_max; 2477 t.openmin = 0; 2478 t.openmax = 0; 2479 t.integer = 1; 2480 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2481 } 2482 2483 static int snd_pcm_hw_rule_subformats(struct snd_pcm_hw_params *params, 2484 struct snd_pcm_hw_rule *rule) 2485 { 2486 struct snd_mask *sfmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT); 2487 struct snd_mask *fmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2488 u32 *subformats = rule->private; 2489 snd_pcm_format_t f; 2490 struct snd_mask m; 2491 2492 snd_mask_none(&m); 2493 /* All PCMs support at least the default STD subformat. */ 2494 snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_STD); 2495 2496 pcm_for_each_format(f) { 2497 if (!snd_mask_test(fmask, (__force unsigned)f)) 2498 continue; 2499 2500 if (f == SNDRV_PCM_FORMAT_S32_LE && *subformats) 2501 m.bits[0] |= *subformats; 2502 else if (snd_pcm_format_linear(f)) 2503 snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX); 2504 } 2505 2506 return snd_mask_refine(sfmask, &m); 2507 } 2508 2509 static int snd_pcm_hw_constraint_subformats(struct snd_pcm_runtime *runtime, 2510 unsigned int cond, u32 *subformats) 2511 { 2512 return snd_pcm_hw_rule_add(runtime, cond, -1, 2513 snd_pcm_hw_rule_subformats, (void *)subformats, 2514 SNDRV_PCM_HW_PARAM_SUBFORMAT, 2515 SNDRV_PCM_HW_PARAM_FORMAT, -1); 2516 } 2517 2518 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2519 { 2520 struct snd_pcm_runtime *runtime = substream->runtime; 2521 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2522 int k, err; 2523 2524 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2525 snd_mask_any(constrs_mask(constrs, k)); 2526 } 2527 2528 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2529 snd_interval_any(constrs_interval(constrs, k)); 2530 } 2531 2532 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2533 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2534 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2535 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2536 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2537 2538 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2539 snd_pcm_hw_rule_format, NULL, 2540 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2541 if (err < 0) 2542 return err; 2543 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2544 snd_pcm_hw_rule_sample_bits, NULL, 2545 SNDRV_PCM_HW_PARAM_FORMAT, 2546 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2547 if (err < 0) 2548 return err; 2549 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2550 snd_pcm_hw_rule_div, NULL, 2551 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2552 if (err < 0) 2553 return err; 2554 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2555 snd_pcm_hw_rule_mul, NULL, 2556 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2557 if (err < 0) 2558 return err; 2559 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2560 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2561 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2562 if (err < 0) 2563 return err; 2564 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2565 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2566 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2567 if (err < 0) 2568 return err; 2569 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2570 snd_pcm_hw_rule_div, NULL, 2571 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2572 if (err < 0) 2573 return err; 2574 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2575 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2576 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2577 if (err < 0) 2578 return err; 2579 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2580 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2581 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2582 if (err < 0) 2583 return err; 2584 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2585 snd_pcm_hw_rule_div, NULL, 2586 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2587 if (err < 0) 2588 return err; 2589 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2590 snd_pcm_hw_rule_div, NULL, 2591 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2592 if (err < 0) 2593 return err; 2594 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2595 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2596 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2597 if (err < 0) 2598 return err; 2599 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2600 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2601 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2602 if (err < 0) 2603 return err; 2604 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2605 snd_pcm_hw_rule_mul, NULL, 2606 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2607 if (err < 0) 2608 return err; 2609 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2610 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2611 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2612 if (err < 0) 2613 return err; 2614 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2615 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2616 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2617 if (err < 0) 2618 return err; 2619 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2620 snd_pcm_hw_rule_muldivk, (void*) 8, 2621 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2622 if (err < 0) 2623 return err; 2624 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2625 snd_pcm_hw_rule_muldivk, (void*) 8, 2626 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2627 if (err < 0) 2628 return err; 2629 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2630 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2631 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2632 if (err < 0) 2633 return err; 2634 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2635 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2636 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2637 if (err < 0) 2638 return err; 2639 return 0; 2640 } 2641 2642 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2643 { 2644 struct snd_pcm_runtime *runtime = substream->runtime; 2645 struct snd_pcm_hardware *hw = &runtime->hw; 2646 int err; 2647 unsigned int mask = 0; 2648 2649 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2650 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED); 2651 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2652 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 2653 if (hw_support_mmap(substream)) { 2654 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2655 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED); 2656 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2657 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED); 2658 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2659 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX); 2660 } 2661 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2662 if (err < 0) 2663 return err; 2664 2665 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2666 if (err < 0) 2667 return err; 2668 2669 err = snd_pcm_hw_constraint_subformats(runtime, 0, &hw->subformats); 2670 if (err < 0) 2671 return err; 2672 2673 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2674 hw->channels_min, hw->channels_max); 2675 if (err < 0) 2676 return err; 2677 2678 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2679 hw->rate_min, hw->rate_max); 2680 if (err < 0) 2681 return err; 2682 2683 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2684 hw->period_bytes_min, hw->period_bytes_max); 2685 if (err < 0) 2686 return err; 2687 2688 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2689 hw->periods_min, hw->periods_max); 2690 if (err < 0) 2691 return err; 2692 2693 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2694 hw->period_bytes_min, hw->buffer_bytes_max); 2695 if (err < 0) 2696 return err; 2697 2698 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2699 snd_pcm_hw_rule_buffer_bytes_max, substream, 2700 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2701 if (err < 0) 2702 return err; 2703 2704 /* FIXME: remove */ 2705 if (runtime->dma_bytes) { 2706 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2707 if (err < 0) 2708 return err; 2709 } 2710 2711 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2712 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2713 snd_pcm_hw_rule_rate, hw, 2714 SNDRV_PCM_HW_PARAM_RATE, -1); 2715 if (err < 0) 2716 return err; 2717 } 2718 2719 /* FIXME: this belong to lowlevel */ 2720 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2721 2722 return 0; 2723 } 2724 2725 static void pcm_release_private(struct snd_pcm_substream *substream) 2726 { 2727 if (snd_pcm_stream_linked(substream)) 2728 snd_pcm_unlink(substream); 2729 } 2730 2731 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2732 { 2733 substream->ref_count--; 2734 if (substream->ref_count > 0) 2735 return; 2736 2737 snd_pcm_drop(substream); 2738 if (substream->hw_opened) { 2739 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN) 2740 do_hw_free(substream); 2741 substream->ops->close(substream); 2742 substream->hw_opened = 0; 2743 } 2744 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 2745 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 2746 if (substream->pcm_release) { 2747 substream->pcm_release(substream); 2748 substream->pcm_release = NULL; 2749 } 2750 snd_pcm_detach_substream(substream); 2751 } 2752 EXPORT_SYMBOL(snd_pcm_release_substream); 2753 2754 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2755 struct file *file, 2756 struct snd_pcm_substream **rsubstream) 2757 { 2758 struct snd_pcm_substream *substream; 2759 int err; 2760 2761 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2762 if (err < 0) 2763 return err; 2764 if (substream->ref_count > 1) { 2765 *rsubstream = substream; 2766 return 0; 2767 } 2768 2769 err = snd_pcm_hw_constraints_init(substream); 2770 if (err < 0) { 2771 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2772 goto error; 2773 } 2774 2775 err = substream->ops->open(substream); 2776 if (err < 0) 2777 goto error; 2778 2779 substream->hw_opened = 1; 2780 2781 err = snd_pcm_hw_constraints_complete(substream); 2782 if (err < 0) { 2783 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2784 goto error; 2785 } 2786 2787 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever 2788 * the DMA buffer requires it 2789 */ 2790 if (substream->managed_buffer_alloc && 2791 substream->dma_buffer.dev.need_sync) 2792 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC; 2793 2794 *rsubstream = substream; 2795 return 0; 2796 2797 error: 2798 snd_pcm_release_substream(substream); 2799 return err; 2800 } 2801 EXPORT_SYMBOL(snd_pcm_open_substream); 2802 2803 static int snd_pcm_open_file(struct file *file, 2804 struct snd_pcm *pcm, 2805 int stream) 2806 { 2807 struct snd_pcm_file *pcm_file; 2808 struct snd_pcm_substream *substream; 2809 int err; 2810 2811 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2812 if (err < 0) 2813 return err; 2814 2815 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2816 if (pcm_file == NULL) { 2817 snd_pcm_release_substream(substream); 2818 return -ENOMEM; 2819 } 2820 pcm_file->substream = substream; 2821 if (substream->ref_count == 1) 2822 substream->pcm_release = pcm_release_private; 2823 file->private_data = pcm_file; 2824 2825 return 0; 2826 } 2827 2828 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2829 { 2830 struct snd_pcm *pcm; 2831 int err = nonseekable_open(inode, file); 2832 if (err < 0) 2833 return err; 2834 pcm = snd_lookup_minor_data(iminor(inode), 2835 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2836 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2837 if (pcm) 2838 snd_card_unref(pcm->card); 2839 return err; 2840 } 2841 2842 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2843 { 2844 struct snd_pcm *pcm; 2845 int err = nonseekable_open(inode, file); 2846 if (err < 0) 2847 return err; 2848 pcm = snd_lookup_minor_data(iminor(inode), 2849 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2850 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2851 if (pcm) 2852 snd_card_unref(pcm->card); 2853 return err; 2854 } 2855 2856 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2857 { 2858 int err; 2859 wait_queue_entry_t wait; 2860 2861 if (pcm == NULL) { 2862 err = -ENODEV; 2863 goto __error1; 2864 } 2865 err = snd_card_file_add(pcm->card, file); 2866 if (err < 0) 2867 goto __error1; 2868 if (!try_module_get(pcm->card->module)) { 2869 err = -EFAULT; 2870 goto __error2; 2871 } 2872 init_waitqueue_entry(&wait, current); 2873 add_wait_queue(&pcm->open_wait, &wait); 2874 mutex_lock(&pcm->open_mutex); 2875 while (1) { 2876 err = snd_pcm_open_file(file, pcm, stream); 2877 if (err >= 0) 2878 break; 2879 if (err == -EAGAIN) { 2880 if (file->f_flags & O_NONBLOCK) { 2881 err = -EBUSY; 2882 break; 2883 } 2884 } else 2885 break; 2886 set_current_state(TASK_INTERRUPTIBLE); 2887 mutex_unlock(&pcm->open_mutex); 2888 schedule(); 2889 mutex_lock(&pcm->open_mutex); 2890 if (pcm->card->shutdown) { 2891 err = -ENODEV; 2892 break; 2893 } 2894 if (signal_pending(current)) { 2895 err = -ERESTARTSYS; 2896 break; 2897 } 2898 } 2899 remove_wait_queue(&pcm->open_wait, &wait); 2900 mutex_unlock(&pcm->open_mutex); 2901 if (err < 0) 2902 goto __error; 2903 return err; 2904 2905 __error: 2906 module_put(pcm->card->module); 2907 __error2: 2908 snd_card_file_remove(pcm->card, file); 2909 __error1: 2910 return err; 2911 } 2912 2913 static int snd_pcm_release(struct inode *inode, struct file *file) 2914 { 2915 struct snd_pcm *pcm; 2916 struct snd_pcm_substream *substream; 2917 struct snd_pcm_file *pcm_file; 2918 2919 pcm_file = file->private_data; 2920 substream = pcm_file->substream; 2921 if (snd_BUG_ON(!substream)) 2922 return -ENXIO; 2923 pcm = substream->pcm; 2924 2925 /* block until the device gets woken up as it may touch the hardware */ 2926 snd_power_wait(pcm->card); 2927 2928 scoped_guard(mutex, &pcm->open_mutex) { 2929 snd_pcm_release_substream(substream); 2930 kfree(pcm_file); 2931 } 2932 wake_up(&pcm->open_wait); 2933 module_put(pcm->card->module); 2934 snd_card_file_remove(pcm->card, file); 2935 return 0; 2936 } 2937 2938 /* check and update PCM state; return 0 or a negative error 2939 * call this inside PCM lock 2940 */ 2941 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2942 { 2943 switch (substream->runtime->state) { 2944 case SNDRV_PCM_STATE_DRAINING: 2945 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2946 return -EBADFD; 2947 fallthrough; 2948 case SNDRV_PCM_STATE_RUNNING: 2949 return snd_pcm_update_hw_ptr(substream); 2950 case SNDRV_PCM_STATE_PREPARED: 2951 case SNDRV_PCM_STATE_PAUSED: 2952 return 0; 2953 case SNDRV_PCM_STATE_SUSPENDED: 2954 return -ESTRPIPE; 2955 case SNDRV_PCM_STATE_XRUN: 2956 return -EPIPE; 2957 default: 2958 return -EBADFD; 2959 } 2960 } 2961 2962 /* increase the appl_ptr; returns the processed frames or a negative error */ 2963 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2964 snd_pcm_uframes_t frames, 2965 snd_pcm_sframes_t avail) 2966 { 2967 struct snd_pcm_runtime *runtime = substream->runtime; 2968 snd_pcm_sframes_t appl_ptr; 2969 int ret; 2970 2971 if (avail <= 0) 2972 return 0; 2973 if (frames > (snd_pcm_uframes_t)avail) 2974 frames = avail; 2975 appl_ptr = runtime->control->appl_ptr + frames; 2976 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2977 appl_ptr -= runtime->boundary; 2978 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2979 return ret < 0 ? ret : frames; 2980 } 2981 2982 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2983 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2984 snd_pcm_uframes_t frames, 2985 snd_pcm_sframes_t avail) 2986 { 2987 struct snd_pcm_runtime *runtime = substream->runtime; 2988 snd_pcm_sframes_t appl_ptr; 2989 int ret; 2990 2991 if (avail <= 0) 2992 return 0; 2993 if (frames > (snd_pcm_uframes_t)avail) 2994 frames = avail; 2995 appl_ptr = runtime->control->appl_ptr - frames; 2996 if (appl_ptr < 0) 2997 appl_ptr += runtime->boundary; 2998 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2999 /* NOTE: we return zero for errors because PulseAudio gets depressed 3000 * upon receiving an error from rewind ioctl and stops processing 3001 * any longer. Returning zero means that no rewind is done, so 3002 * it's not absolutely wrong to answer like that. 3003 */ 3004 return ret < 0 ? 0 : frames; 3005 } 3006 3007 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 3008 snd_pcm_uframes_t frames) 3009 { 3010 snd_pcm_sframes_t ret; 3011 3012 if (frames == 0) 3013 return 0; 3014 3015 scoped_guard(pcm_stream_lock_irq, substream) { 3016 ret = do_pcm_hwsync(substream); 3017 if (!ret) 3018 ret = rewind_appl_ptr(substream, frames, 3019 snd_pcm_hw_avail(substream)); 3020 } 3021 if (ret >= 0) 3022 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3023 return ret; 3024 } 3025 3026 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 3027 snd_pcm_uframes_t frames) 3028 { 3029 snd_pcm_sframes_t ret; 3030 3031 if (frames == 0) 3032 return 0; 3033 3034 scoped_guard(pcm_stream_lock_irq, substream) { 3035 ret = do_pcm_hwsync(substream); 3036 if (!ret) 3037 ret = forward_appl_ptr(substream, frames, 3038 snd_pcm_avail(substream)); 3039 } 3040 if (ret >= 0) 3041 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3042 return ret; 3043 } 3044 3045 static int snd_pcm_delay(struct snd_pcm_substream *substream, 3046 snd_pcm_sframes_t *delay) 3047 { 3048 int err; 3049 3050 scoped_guard(pcm_stream_lock_irq, substream) { 3051 err = do_pcm_hwsync(substream); 3052 if (delay && !err) 3053 *delay = snd_pcm_calc_delay(substream); 3054 } 3055 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU); 3056 3057 return err; 3058 } 3059 3060 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream) 3061 { 3062 return snd_pcm_delay(substream, NULL); 3063 } 3064 3065 #define snd_pcm_sync_ptr_get_user(__f, __c, __ptr) ({ \ 3066 __label__ failed, failed_begin; \ 3067 int __err = -EFAULT; \ 3068 typeof(*(__ptr)) __user *__src = (__ptr); \ 3069 \ 3070 if (!user_read_access_begin(__src, sizeof(*__src))) \ 3071 goto failed_begin; \ 3072 unsafe_get_user(__f, &__src->flags, failed); \ 3073 unsafe_get_user(__c.appl_ptr, &__src->c.control.appl_ptr, failed); \ 3074 unsafe_get_user(__c.avail_min, &__src->c.control.avail_min, failed); \ 3075 __err = 0; \ 3076 failed: \ 3077 user_read_access_end(); \ 3078 failed_begin: \ 3079 __err; \ 3080 }) 3081 3082 #define snd_pcm_sync_ptr_put_user(__s, __c, __ptr) ({ \ 3083 __label__ failed, failed_begin; \ 3084 int __err = -EFAULT; \ 3085 typeof(*(__ptr)) __user *__src = (__ptr); \ 3086 \ 3087 if (!user_write_access_begin(__src, sizeof(*__src))) \ 3088 goto failed_begin; \ 3089 unsafe_put_user(__s.state, &__src->s.status.state, failed); \ 3090 unsafe_put_user(__s.hw_ptr, &__src->s.status.hw_ptr, failed); \ 3091 unsafe_put_user(__s.tstamp.tv_sec, &__src->s.status.tstamp.tv_sec, failed); \ 3092 unsafe_put_user(__s.tstamp.tv_nsec, &__src->s.status.tstamp.tv_nsec, failed); \ 3093 unsafe_put_user(__s.suspended_state, &__src->s.status.suspended_state, failed); \ 3094 unsafe_put_user(__s.audio_tstamp.tv_sec, &__src->s.status.audio_tstamp.tv_sec, failed); \ 3095 unsafe_put_user(__s.audio_tstamp.tv_nsec, &__src->s.status.audio_tstamp.tv_nsec, failed);\ 3096 unsafe_put_user(__c.appl_ptr, &__src->c.control.appl_ptr, failed); \ 3097 unsafe_put_user(__c.avail_min, &__src->c.control.avail_min, failed); \ 3098 __err = 0; \ 3099 failed: \ 3100 user_write_access_end(); \ 3101 failed_begin: \ 3102 __err; \ 3103 }) 3104 3105 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 3106 struct snd_pcm_sync_ptr __user *_sync_ptr) 3107 { 3108 struct snd_pcm_runtime *runtime = substream->runtime; 3109 volatile struct snd_pcm_mmap_status *status; 3110 volatile struct snd_pcm_mmap_control *control; 3111 u32 sflags; 3112 struct snd_pcm_mmap_control scontrol; 3113 struct snd_pcm_mmap_status sstatus; 3114 int err; 3115 3116 if (snd_pcm_sync_ptr_get_user(sflags, scontrol, _sync_ptr)) 3117 return -EFAULT; 3118 status = runtime->status; 3119 control = runtime->control; 3120 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3121 err = snd_pcm_hwsync(substream); 3122 if (err < 0) 3123 return err; 3124 } 3125 scoped_guard(pcm_stream_lock_irq, substream) { 3126 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) { 3127 err = pcm_lib_apply_appl_ptr(substream, scontrol.appl_ptr); 3128 if (err < 0) 3129 return err; 3130 } else { 3131 scontrol.appl_ptr = control->appl_ptr; 3132 } 3133 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3134 control->avail_min = scontrol.avail_min; 3135 else 3136 scontrol.avail_min = control->avail_min; 3137 sstatus.state = status->state; 3138 sstatus.hw_ptr = status->hw_ptr; 3139 sstatus.tstamp = status->tstamp; 3140 sstatus.suspended_state = status->suspended_state; 3141 sstatus.audio_tstamp = status->audio_tstamp; 3142 } 3143 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 3144 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3145 if (snd_pcm_sync_ptr_put_user(sstatus, scontrol, _sync_ptr)) 3146 return -EFAULT; 3147 return 0; 3148 } 3149 3150 struct snd_pcm_mmap_status32 { 3151 snd_pcm_state_t state; 3152 s32 pad1; 3153 u32 hw_ptr; 3154 struct __snd_timespec tstamp; 3155 snd_pcm_state_t suspended_state; 3156 struct __snd_timespec audio_tstamp; 3157 } __packed; 3158 3159 struct snd_pcm_mmap_control32 { 3160 u32 appl_ptr; 3161 u32 avail_min; 3162 }; 3163 3164 struct snd_pcm_sync_ptr32 { 3165 u32 flags; 3166 union { 3167 struct snd_pcm_mmap_status32 status; 3168 unsigned char reserved[64]; 3169 } s; 3170 union { 3171 struct snd_pcm_mmap_control32 control; 3172 unsigned char reserved[64]; 3173 } c; 3174 } __packed; 3175 3176 /* recalculate the boundary within 32bit */ 3177 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime) 3178 { 3179 snd_pcm_uframes_t boundary; 3180 snd_pcm_uframes_t border; 3181 int order; 3182 3183 if (! runtime->buffer_size) 3184 return 0; 3185 3186 border = 0x7fffffffUL - runtime->buffer_size; 3187 if (runtime->buffer_size > border) 3188 return runtime->buffer_size; 3189 3190 order = __fls(border) - __fls(runtime->buffer_size); 3191 boundary = runtime->buffer_size << order; 3192 3193 if (boundary <= border) 3194 return boundary; 3195 else 3196 return boundary / 2; 3197 } 3198 3199 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, 3200 struct snd_pcm_sync_ptr32 __user *src) 3201 { 3202 struct snd_pcm_runtime *runtime = substream->runtime; 3203 volatile struct snd_pcm_mmap_status *status; 3204 volatile struct snd_pcm_mmap_control *control; 3205 u32 sflags; 3206 struct snd_pcm_mmap_control scontrol; 3207 struct snd_pcm_mmap_status sstatus; 3208 snd_pcm_uframes_t boundary; 3209 int err; 3210 3211 if (snd_BUG_ON(!runtime)) 3212 return -EINVAL; 3213 3214 if (snd_pcm_sync_ptr_get_user(sflags, scontrol, src)) 3215 return -EFAULT; 3216 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3217 err = snd_pcm_hwsync(substream); 3218 if (err < 0) 3219 return err; 3220 } 3221 status = runtime->status; 3222 control = runtime->control; 3223 boundary = recalculate_boundary(runtime); 3224 if (! boundary) 3225 boundary = 0x7fffffff; 3226 scoped_guard(pcm_stream_lock_irq, substream) { 3227 /* FIXME: we should consider the boundary for the sync from app */ 3228 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) { 3229 err = pcm_lib_apply_appl_ptr(substream, 3230 scontrol.appl_ptr); 3231 if (err < 0) 3232 return err; 3233 } else 3234 scontrol.appl_ptr = control->appl_ptr % boundary; 3235 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3236 control->avail_min = scontrol.avail_min; 3237 else 3238 scontrol.avail_min = control->avail_min; 3239 sstatus.state = status->state; 3240 sstatus.hw_ptr = status->hw_ptr % boundary; 3241 sstatus.tstamp = status->tstamp; 3242 sstatus.suspended_state = status->suspended_state; 3243 sstatus.audio_tstamp = status->audio_tstamp; 3244 } 3245 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 3246 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3247 if (snd_pcm_sync_ptr_put_user(sstatus, scontrol, src)) 3248 return -EFAULT; 3249 3250 return 0; 3251 } 3252 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32) 3253 3254 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 3255 { 3256 struct snd_pcm_runtime *runtime = substream->runtime; 3257 int arg; 3258 3259 if (get_user(arg, _arg)) 3260 return -EFAULT; 3261 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 3262 return -EINVAL; 3263 runtime->tstamp_type = arg; 3264 return 0; 3265 } 3266 3267 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 3268 struct snd_xferi __user *_xferi) 3269 { 3270 struct snd_xferi xferi; 3271 struct snd_pcm_runtime *runtime = substream->runtime; 3272 snd_pcm_sframes_t result; 3273 3274 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3275 return -EBADFD; 3276 if (put_user(0, &_xferi->result)) 3277 return -EFAULT; 3278 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 3279 return -EFAULT; 3280 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3281 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 3282 else 3283 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 3284 if (put_user(result, &_xferi->result)) 3285 return -EFAULT; 3286 return result < 0 ? result : 0; 3287 } 3288 3289 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 3290 struct snd_xfern __user *_xfern) 3291 { 3292 struct snd_xfern xfern; 3293 struct snd_pcm_runtime *runtime = substream->runtime; 3294 void *bufs __free(kfree) = NULL; 3295 snd_pcm_sframes_t result; 3296 3297 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3298 return -EBADFD; 3299 if (runtime->channels > 128) 3300 return -EINVAL; 3301 if (put_user(0, &_xfern->result)) 3302 return -EFAULT; 3303 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 3304 return -EFAULT; 3305 3306 bufs = memdup_array_user(xfern.bufs, runtime->channels, sizeof(void *)); 3307 if (IS_ERR(bufs)) 3308 return PTR_ERR(bufs); 3309 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3310 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 3311 else 3312 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 3313 if (put_user(result, &_xfern->result)) 3314 return -EFAULT; 3315 return result < 0 ? result : 0; 3316 } 3317 3318 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 3319 snd_pcm_uframes_t __user *_frames) 3320 { 3321 snd_pcm_uframes_t frames; 3322 snd_pcm_sframes_t result; 3323 3324 if (get_user(frames, _frames)) 3325 return -EFAULT; 3326 if (put_user(0, _frames)) 3327 return -EFAULT; 3328 result = snd_pcm_rewind(substream, frames); 3329 if (put_user(result, _frames)) 3330 return -EFAULT; 3331 return result < 0 ? result : 0; 3332 } 3333 3334 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 3335 snd_pcm_uframes_t __user *_frames) 3336 { 3337 snd_pcm_uframes_t frames; 3338 snd_pcm_sframes_t result; 3339 3340 if (get_user(frames, _frames)) 3341 return -EFAULT; 3342 if (put_user(0, _frames)) 3343 return -EFAULT; 3344 result = snd_pcm_forward(substream, frames); 3345 if (put_user(result, _frames)) 3346 return -EFAULT; 3347 return result < 0 ? result : 0; 3348 } 3349 3350 static int snd_pcm_common_ioctl(struct file *file, 3351 struct snd_pcm_substream *substream, 3352 unsigned int cmd, void __user *arg) 3353 { 3354 struct snd_pcm_file *pcm_file = file->private_data; 3355 int res; 3356 3357 if (PCM_RUNTIME_CHECK(substream)) 3358 return -ENXIO; 3359 3360 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3361 return -EBADFD; 3362 3363 res = snd_power_wait(substream->pcm->card); 3364 if (res < 0) 3365 return res; 3366 3367 switch (cmd) { 3368 case SNDRV_PCM_IOCTL_PVERSION: 3369 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 3370 case SNDRV_PCM_IOCTL_INFO: 3371 return snd_pcm_info_user(substream, arg); 3372 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 3373 return 0; 3374 case SNDRV_PCM_IOCTL_TTSTAMP: 3375 return snd_pcm_tstamp(substream, arg); 3376 case SNDRV_PCM_IOCTL_USER_PVERSION: 3377 if (get_user(pcm_file->user_pversion, 3378 (unsigned int __user *)arg)) 3379 return -EFAULT; 3380 return 0; 3381 case SNDRV_PCM_IOCTL_HW_REFINE: 3382 return snd_pcm_hw_refine_user(substream, arg); 3383 case SNDRV_PCM_IOCTL_HW_PARAMS: 3384 return snd_pcm_hw_params_user(substream, arg); 3385 case SNDRV_PCM_IOCTL_HW_FREE: 3386 return snd_pcm_hw_free(substream); 3387 case SNDRV_PCM_IOCTL_SW_PARAMS: 3388 return snd_pcm_sw_params_user(substream, arg); 3389 case SNDRV_PCM_IOCTL_STATUS32: 3390 return snd_pcm_status_user32(substream, arg, false); 3391 case SNDRV_PCM_IOCTL_STATUS_EXT32: 3392 return snd_pcm_status_user32(substream, arg, true); 3393 case SNDRV_PCM_IOCTL_STATUS64: 3394 return snd_pcm_status_user64(substream, arg, false); 3395 case SNDRV_PCM_IOCTL_STATUS_EXT64: 3396 return snd_pcm_status_user64(substream, arg, true); 3397 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 3398 return snd_pcm_channel_info_user(substream, arg); 3399 case SNDRV_PCM_IOCTL_PREPARE: 3400 return snd_pcm_prepare(substream, file); 3401 case SNDRV_PCM_IOCTL_RESET: 3402 return snd_pcm_reset(substream); 3403 case SNDRV_PCM_IOCTL_START: 3404 return snd_pcm_start_lock_irq(substream); 3405 case SNDRV_PCM_IOCTL_LINK: 3406 return snd_pcm_link(substream, (int)(unsigned long) arg); 3407 case SNDRV_PCM_IOCTL_UNLINK: 3408 return snd_pcm_unlink(substream); 3409 case SNDRV_PCM_IOCTL_RESUME: 3410 return snd_pcm_resume(substream); 3411 case SNDRV_PCM_IOCTL_XRUN: 3412 return snd_pcm_xrun(substream); 3413 case SNDRV_PCM_IOCTL_HWSYNC: 3414 return snd_pcm_hwsync(substream); 3415 case SNDRV_PCM_IOCTL_DELAY: 3416 { 3417 snd_pcm_sframes_t delay = 0; 3418 snd_pcm_sframes_t __user *res = arg; 3419 int err; 3420 3421 err = snd_pcm_delay(substream, &delay); 3422 if (err) 3423 return err; 3424 if (put_user(delay, res)) 3425 return -EFAULT; 3426 return 0; 3427 } 3428 case __SNDRV_PCM_IOCTL_SYNC_PTR32: 3429 return snd_pcm_ioctl_sync_ptr_compat(substream, arg); 3430 case __SNDRV_PCM_IOCTL_SYNC_PTR64: 3431 return snd_pcm_sync_ptr(substream, arg); 3432 #ifdef CONFIG_SND_SUPPORT_OLD_API 3433 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 3434 return snd_pcm_hw_refine_old_user(substream, arg); 3435 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 3436 return snd_pcm_hw_params_old_user(substream, arg); 3437 #endif 3438 case SNDRV_PCM_IOCTL_DRAIN: 3439 return snd_pcm_drain(substream, file); 3440 case SNDRV_PCM_IOCTL_DROP: 3441 return snd_pcm_drop(substream); 3442 case SNDRV_PCM_IOCTL_PAUSE: 3443 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg); 3444 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3445 case SNDRV_PCM_IOCTL_READI_FRAMES: 3446 return snd_pcm_xferi_frames_ioctl(substream, arg); 3447 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3448 case SNDRV_PCM_IOCTL_READN_FRAMES: 3449 return snd_pcm_xfern_frames_ioctl(substream, arg); 3450 case SNDRV_PCM_IOCTL_REWIND: 3451 return snd_pcm_rewind_ioctl(substream, arg); 3452 case SNDRV_PCM_IOCTL_FORWARD: 3453 return snd_pcm_forward_ioctl(substream, arg); 3454 } 3455 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3456 return -ENOTTY; 3457 } 3458 3459 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3460 unsigned long arg) 3461 { 3462 struct snd_pcm_file *pcm_file; 3463 3464 pcm_file = file->private_data; 3465 3466 if (((cmd >> 8) & 0xff) != 'A') 3467 return -ENOTTY; 3468 3469 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3470 (void __user *)arg); 3471 } 3472 3473 /** 3474 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3475 * @substream: PCM substream 3476 * @cmd: IOCTL cmd 3477 * @arg: IOCTL argument 3478 * 3479 * The function is provided primarily for OSS layer and USB gadget drivers, 3480 * and it allows only the limited set of ioctls (hw_params, sw_params, 3481 * prepare, start, drain, drop, forward). 3482 * 3483 * Return: zero if successful, or a negative error code 3484 */ 3485 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3486 unsigned int cmd, void *arg) 3487 { 3488 snd_pcm_uframes_t *frames = arg; 3489 snd_pcm_sframes_t result; 3490 3491 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3492 return -EBADFD; 3493 3494 switch (cmd) { 3495 case SNDRV_PCM_IOCTL_FORWARD: 3496 { 3497 /* provided only for OSS; capture-only and no value returned */ 3498 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3499 return -EINVAL; 3500 result = snd_pcm_forward(substream, *frames); 3501 return result < 0 ? result : 0; 3502 } 3503 case SNDRV_PCM_IOCTL_HW_PARAMS: 3504 return snd_pcm_hw_params(substream, arg); 3505 case SNDRV_PCM_IOCTL_SW_PARAMS: 3506 return snd_pcm_sw_params(substream, arg); 3507 case SNDRV_PCM_IOCTL_PREPARE: 3508 return snd_pcm_prepare(substream, NULL); 3509 case SNDRV_PCM_IOCTL_START: 3510 return snd_pcm_start_lock_irq(substream); 3511 case SNDRV_PCM_IOCTL_DRAIN: 3512 return snd_pcm_drain(substream, NULL); 3513 case SNDRV_PCM_IOCTL_DROP: 3514 return snd_pcm_drop(substream); 3515 case SNDRV_PCM_IOCTL_DELAY: 3516 return snd_pcm_delay(substream, frames); 3517 default: 3518 return -EINVAL; 3519 } 3520 } 3521 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3522 3523 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3524 loff_t * offset) 3525 { 3526 struct snd_pcm_file *pcm_file; 3527 struct snd_pcm_substream *substream; 3528 struct snd_pcm_runtime *runtime; 3529 snd_pcm_sframes_t result; 3530 3531 pcm_file = file->private_data; 3532 substream = pcm_file->substream; 3533 if (PCM_RUNTIME_CHECK(substream)) 3534 return -ENXIO; 3535 runtime = substream->runtime; 3536 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3537 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3538 return -EBADFD; 3539 if (!frame_aligned(runtime, count)) 3540 return -EINVAL; 3541 count = bytes_to_frames(runtime, count); 3542 result = snd_pcm_lib_read(substream, buf, count); 3543 if (result > 0) 3544 result = frames_to_bytes(runtime, result); 3545 return result; 3546 } 3547 3548 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3549 size_t count, loff_t * offset) 3550 { 3551 struct snd_pcm_file *pcm_file; 3552 struct snd_pcm_substream *substream; 3553 struct snd_pcm_runtime *runtime; 3554 snd_pcm_sframes_t result; 3555 3556 pcm_file = file->private_data; 3557 substream = pcm_file->substream; 3558 if (PCM_RUNTIME_CHECK(substream)) 3559 return -ENXIO; 3560 runtime = substream->runtime; 3561 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3562 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3563 return -EBADFD; 3564 if (!frame_aligned(runtime, count)) 3565 return -EINVAL; 3566 count = bytes_to_frames(runtime, count); 3567 result = snd_pcm_lib_write(substream, buf, count); 3568 if (result > 0) 3569 result = frames_to_bytes(runtime, result); 3570 return result; 3571 } 3572 3573 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3574 { 3575 struct snd_pcm_file *pcm_file; 3576 struct snd_pcm_substream *substream; 3577 struct snd_pcm_runtime *runtime; 3578 snd_pcm_sframes_t result; 3579 unsigned long i; 3580 snd_pcm_uframes_t frames; 3581 const struct iovec *iov = iter_iov(to); 3582 3583 pcm_file = iocb->ki_filp->private_data; 3584 substream = pcm_file->substream; 3585 if (PCM_RUNTIME_CHECK(substream)) 3586 return -ENXIO; 3587 runtime = substream->runtime; 3588 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3589 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3590 return -EBADFD; 3591 if (!user_backed_iter(to)) 3592 return -EINVAL; 3593 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3594 return -EINVAL; 3595 if (!frame_aligned(runtime, iov->iov_len)) 3596 return -EINVAL; 3597 frames = bytes_to_samples(runtime, iov->iov_len); 3598 3599 void __user **bufs __free(kfree) = 3600 kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3601 if (bufs == NULL) 3602 return -ENOMEM; 3603 for (i = 0; i < to->nr_segs; ++i) { 3604 bufs[i] = iov->iov_base; 3605 iov++; 3606 } 3607 result = snd_pcm_lib_readv(substream, bufs, frames); 3608 if (result > 0) 3609 result = frames_to_bytes(runtime, result); 3610 return result; 3611 } 3612 3613 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3614 { 3615 struct snd_pcm_file *pcm_file; 3616 struct snd_pcm_substream *substream; 3617 struct snd_pcm_runtime *runtime; 3618 snd_pcm_sframes_t result; 3619 unsigned long i; 3620 snd_pcm_uframes_t frames; 3621 const struct iovec *iov = iter_iov(from); 3622 3623 pcm_file = iocb->ki_filp->private_data; 3624 substream = pcm_file->substream; 3625 if (PCM_RUNTIME_CHECK(substream)) 3626 return -ENXIO; 3627 runtime = substream->runtime; 3628 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3629 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3630 return -EBADFD; 3631 if (!user_backed_iter(from)) 3632 return -EINVAL; 3633 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3634 !frame_aligned(runtime, iov->iov_len)) 3635 return -EINVAL; 3636 frames = bytes_to_samples(runtime, iov->iov_len); 3637 3638 void __user **bufs __free(kfree) = 3639 kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3640 if (bufs == NULL) 3641 return -ENOMEM; 3642 for (i = 0; i < from->nr_segs; ++i) { 3643 bufs[i] = iov->iov_base; 3644 iov++; 3645 } 3646 result = snd_pcm_lib_writev(substream, bufs, frames); 3647 if (result > 0) 3648 result = frames_to_bytes(runtime, result); 3649 return result; 3650 } 3651 3652 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3653 { 3654 struct snd_pcm_file *pcm_file; 3655 struct snd_pcm_substream *substream; 3656 struct snd_pcm_runtime *runtime; 3657 __poll_t mask, ok; 3658 snd_pcm_uframes_t avail; 3659 3660 pcm_file = file->private_data; 3661 3662 substream = pcm_file->substream; 3663 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3664 ok = EPOLLOUT | EPOLLWRNORM; 3665 else 3666 ok = EPOLLIN | EPOLLRDNORM; 3667 if (PCM_RUNTIME_CHECK(substream)) 3668 return ok | EPOLLERR; 3669 3670 runtime = substream->runtime; 3671 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3672 return ok | EPOLLERR; 3673 3674 poll_wait(file, &runtime->sleep, wait); 3675 3676 mask = 0; 3677 guard(pcm_stream_lock_irq)(substream); 3678 avail = snd_pcm_avail(substream); 3679 switch (runtime->state) { 3680 case SNDRV_PCM_STATE_RUNNING: 3681 case SNDRV_PCM_STATE_PREPARED: 3682 case SNDRV_PCM_STATE_PAUSED: 3683 if (avail >= runtime->control->avail_min) 3684 mask = ok; 3685 break; 3686 case SNDRV_PCM_STATE_DRAINING: 3687 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3688 mask = ok; 3689 if (!avail) 3690 mask |= EPOLLERR; 3691 } 3692 break; 3693 default: 3694 mask = ok | EPOLLERR; 3695 break; 3696 } 3697 return mask; 3698 } 3699 3700 /* 3701 * mmap support 3702 */ 3703 3704 /* 3705 * Only on coherent architectures, we can mmap the status and the control records 3706 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3707 */ 3708 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3709 /* 3710 * mmap status record 3711 */ 3712 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3713 { 3714 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3715 struct snd_pcm_runtime *runtime; 3716 3717 if (substream == NULL) 3718 return VM_FAULT_SIGBUS; 3719 runtime = substream->runtime; 3720 vmf->page = virt_to_page(runtime->status); 3721 get_page(vmf->page); 3722 return 0; 3723 } 3724 3725 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3726 { 3727 .fault = snd_pcm_mmap_status_fault, 3728 }; 3729 3730 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3731 struct vm_area_struct *area) 3732 { 3733 long size; 3734 if (!(area->vm_flags & VM_READ)) 3735 return -EINVAL; 3736 size = area->vm_end - area->vm_start; 3737 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3738 return -EINVAL; 3739 area->vm_ops = &snd_pcm_vm_ops_status; 3740 area->vm_private_data = substream; 3741 vm_flags_mod(area, VM_DONTEXPAND | VM_DONTDUMP, 3742 VM_WRITE | VM_MAYWRITE); 3743 3744 return 0; 3745 } 3746 3747 /* 3748 * mmap control record 3749 */ 3750 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3751 { 3752 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3753 struct snd_pcm_runtime *runtime; 3754 3755 if (substream == NULL) 3756 return VM_FAULT_SIGBUS; 3757 runtime = substream->runtime; 3758 vmf->page = virt_to_page(runtime->control); 3759 get_page(vmf->page); 3760 return 0; 3761 } 3762 3763 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3764 { 3765 .fault = snd_pcm_mmap_control_fault, 3766 }; 3767 3768 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3769 struct vm_area_struct *area) 3770 { 3771 long size; 3772 if (!(area->vm_flags & VM_READ)) 3773 return -EINVAL; 3774 size = area->vm_end - area->vm_start; 3775 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3776 return -EINVAL; 3777 area->vm_ops = &snd_pcm_vm_ops_control; 3778 area->vm_private_data = substream; 3779 vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP); 3780 return 0; 3781 } 3782 3783 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3784 { 3785 /* If drivers require the explicit sync (typically for non-coherent 3786 * pages), we have to disable the mmap of status and control data 3787 * to enforce the control via SYNC_PTR ioctl. 3788 */ 3789 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC) 3790 return false; 3791 /* See pcm_control_mmap_allowed() below. 3792 * Since older alsa-lib requires both status and control mmaps to be 3793 * coupled, we have to disable the status mmap for old alsa-lib, too. 3794 */ 3795 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3796 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3797 return false; 3798 return true; 3799 } 3800 3801 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3802 { 3803 if (pcm_file->no_compat_mmap) 3804 return false; 3805 /* see above */ 3806 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC) 3807 return false; 3808 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3809 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3810 * thus it effectively assures the manual update of appl_ptr. 3811 */ 3812 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3813 return false; 3814 return true; 3815 } 3816 3817 #else /* ! coherent mmap */ 3818 /* 3819 * don't support mmap for status and control records. 3820 */ 3821 #define pcm_status_mmap_allowed(pcm_file) false 3822 #define pcm_control_mmap_allowed(pcm_file) false 3823 3824 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3825 struct vm_area_struct *area) 3826 { 3827 return -ENXIO; 3828 } 3829 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3830 struct vm_area_struct *area) 3831 { 3832 return -ENXIO; 3833 } 3834 #endif /* coherent mmap */ 3835 3836 /* 3837 * snd_pcm_mmap_data_open - increase the mmap counter 3838 */ 3839 static void snd_pcm_mmap_data_open(struct vm_area_struct *area) 3840 { 3841 struct snd_pcm_substream *substream = area->vm_private_data; 3842 3843 atomic_inc(&substream->mmap_count); 3844 } 3845 3846 /* 3847 * snd_pcm_mmap_data_close - decrease the mmap counter 3848 */ 3849 static void snd_pcm_mmap_data_close(struct vm_area_struct *area) 3850 { 3851 struct snd_pcm_substream *substream = area->vm_private_data; 3852 3853 atomic_dec(&substream->mmap_count); 3854 } 3855 3856 /* 3857 * fault callback for mmapping a RAM page 3858 */ 3859 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3860 { 3861 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3862 struct snd_pcm_runtime *runtime; 3863 unsigned long offset; 3864 struct page * page; 3865 size_t dma_bytes; 3866 3867 if (substream == NULL) 3868 return VM_FAULT_SIGBUS; 3869 runtime = substream->runtime; 3870 offset = vmf->pgoff << PAGE_SHIFT; 3871 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3872 if (offset > dma_bytes - PAGE_SIZE) 3873 return VM_FAULT_SIGBUS; 3874 if (substream->ops->page) 3875 page = substream->ops->page(substream, offset); 3876 else if (!snd_pcm_get_dma_buf(substream)) { 3877 if (WARN_ON_ONCE(!runtime->dma_area)) 3878 return VM_FAULT_SIGBUS; 3879 page = virt_to_page(runtime->dma_area + offset); 3880 } else 3881 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset); 3882 if (!page) 3883 return VM_FAULT_SIGBUS; 3884 get_page(page); 3885 vmf->page = page; 3886 return 0; 3887 } 3888 3889 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3890 .open = snd_pcm_mmap_data_open, 3891 .close = snd_pcm_mmap_data_close, 3892 }; 3893 3894 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3895 .open = snd_pcm_mmap_data_open, 3896 .close = snd_pcm_mmap_data_close, 3897 .fault = snd_pcm_mmap_data_fault, 3898 }; 3899 3900 /* 3901 * mmap the DMA buffer on RAM 3902 */ 3903 3904 /** 3905 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3906 * @substream: PCM substream 3907 * @area: VMA 3908 * 3909 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3910 * this function is invoked implicitly. 3911 * 3912 * Return: zero if successful, or a negative error code 3913 */ 3914 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3915 struct vm_area_struct *area) 3916 { 3917 vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP); 3918 if (!substream->ops->page && 3919 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area)) 3920 return 0; 3921 /* mmap with fault handler */ 3922 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3923 return 0; 3924 } 3925 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3926 3927 /* 3928 * mmap the DMA buffer on I/O memory area 3929 */ 3930 #if SNDRV_PCM_INFO_MMAP_IOMEM 3931 /** 3932 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3933 * @substream: PCM substream 3934 * @area: VMA 3935 * 3936 * When your hardware uses the iomapped pages as the hardware buffer and 3937 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3938 * is supposed to work only on limited architectures. 3939 * 3940 * Return: zero if successful, or a negative error code 3941 */ 3942 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3943 struct vm_area_struct *area) 3944 { 3945 struct snd_pcm_runtime *runtime = substream->runtime; 3946 3947 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3948 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3949 } 3950 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3951 #endif /* SNDRV_PCM_INFO_MMAP */ 3952 3953 /* 3954 * mmap DMA buffer 3955 */ 3956 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3957 struct vm_area_struct *area) 3958 { 3959 struct snd_pcm_runtime *runtime; 3960 long size; 3961 unsigned long offset; 3962 size_t dma_bytes; 3963 int err; 3964 3965 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3966 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3967 return -EINVAL; 3968 } else { 3969 if (!(area->vm_flags & VM_READ)) 3970 return -EINVAL; 3971 } 3972 runtime = substream->runtime; 3973 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3974 return -EBADFD; 3975 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3976 return -ENXIO; 3977 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3978 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3979 return -EINVAL; 3980 size = area->vm_end - area->vm_start; 3981 offset = area->vm_pgoff << PAGE_SHIFT; 3982 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3983 if ((size_t)size > dma_bytes) 3984 return -EINVAL; 3985 if (offset > dma_bytes - size) 3986 return -EINVAL; 3987 3988 area->vm_ops = &snd_pcm_vm_ops_data; 3989 area->vm_private_data = substream; 3990 if (substream->ops->mmap) 3991 err = substream->ops->mmap(substream, area); 3992 else 3993 err = snd_pcm_lib_default_mmap(substream, area); 3994 if (!err) 3995 atomic_inc(&substream->mmap_count); 3996 return err; 3997 } 3998 EXPORT_SYMBOL(snd_pcm_mmap_data); 3999 4000 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 4001 { 4002 struct snd_pcm_file * pcm_file; 4003 struct snd_pcm_substream *substream; 4004 unsigned long offset; 4005 4006 pcm_file = file->private_data; 4007 substream = pcm_file->substream; 4008 if (PCM_RUNTIME_CHECK(substream)) 4009 return -ENXIO; 4010 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 4011 return -EBADFD; 4012 4013 offset = area->vm_pgoff << PAGE_SHIFT; 4014 switch (offset) { 4015 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD: 4016 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 4017 return -ENXIO; 4018 fallthrough; 4019 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 4020 if (!pcm_status_mmap_allowed(pcm_file)) 4021 return -ENXIO; 4022 return snd_pcm_mmap_status(substream, file, area); 4023 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD: 4024 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 4025 return -ENXIO; 4026 fallthrough; 4027 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 4028 if (!pcm_control_mmap_allowed(pcm_file)) 4029 return -ENXIO; 4030 return snd_pcm_mmap_control(substream, file, area); 4031 default: 4032 return snd_pcm_mmap_data(substream, file, area); 4033 } 4034 return 0; 4035 } 4036 4037 static int snd_pcm_fasync(int fd, struct file * file, int on) 4038 { 4039 struct snd_pcm_file * pcm_file; 4040 struct snd_pcm_substream *substream; 4041 struct snd_pcm_runtime *runtime; 4042 4043 pcm_file = file->private_data; 4044 substream = pcm_file->substream; 4045 if (PCM_RUNTIME_CHECK(substream)) 4046 return -ENXIO; 4047 runtime = substream->runtime; 4048 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 4049 return -EBADFD; 4050 return snd_fasync_helper(fd, file, on, &runtime->fasync); 4051 } 4052 4053 /* 4054 * ioctl32 compat 4055 */ 4056 #ifdef CONFIG_COMPAT 4057 #include "pcm_compat.c" 4058 #else 4059 #define snd_pcm_ioctl_compat NULL 4060 #endif 4061 4062 /* 4063 * To be removed helpers to keep binary compatibility 4064 */ 4065 4066 #ifdef CONFIG_SND_SUPPORT_OLD_API 4067 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 4068 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 4069 4070 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 4071 struct snd_pcm_hw_params_old *oparams) 4072 { 4073 unsigned int i; 4074 4075 memset(params, 0, sizeof(*params)); 4076 params->flags = oparams->flags; 4077 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 4078 params->masks[i].bits[0] = oparams->masks[i]; 4079 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 4080 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 4081 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 4082 params->info = oparams->info; 4083 params->msbits = oparams->msbits; 4084 params->rate_num = oparams->rate_num; 4085 params->rate_den = oparams->rate_den; 4086 params->fifo_size = oparams->fifo_size; 4087 } 4088 4089 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 4090 struct snd_pcm_hw_params *params) 4091 { 4092 unsigned int i; 4093 4094 memset(oparams, 0, sizeof(*oparams)); 4095 oparams->flags = params->flags; 4096 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 4097 oparams->masks[i] = params->masks[i].bits[0]; 4098 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 4099 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 4100 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 4101 oparams->info = params->info; 4102 oparams->msbits = params->msbits; 4103 oparams->rate_num = params->rate_num; 4104 oparams->rate_den = params->rate_den; 4105 oparams->fifo_size = params->fifo_size; 4106 } 4107 4108 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 4109 struct snd_pcm_hw_params_old __user * _oparams) 4110 { 4111 int err; 4112 4113 struct snd_pcm_hw_params *params __free(kfree) = 4114 kmalloc(sizeof(*params), GFP_KERNEL); 4115 if (!params) 4116 return -ENOMEM; 4117 4118 struct snd_pcm_hw_params_old *oparams __free(kfree) = 4119 memdup_user(_oparams, sizeof(*oparams)); 4120 if (IS_ERR(oparams)) 4121 return PTR_ERR(oparams); 4122 snd_pcm_hw_convert_from_old_params(params, oparams); 4123 err = snd_pcm_hw_refine(substream, params); 4124 if (err < 0) 4125 return err; 4126 4127 err = fixup_unreferenced_params(substream, params); 4128 if (err < 0) 4129 return err; 4130 4131 snd_pcm_hw_convert_to_old_params(oparams, params); 4132 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 4133 return -EFAULT; 4134 return 0; 4135 } 4136 4137 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 4138 struct snd_pcm_hw_params_old __user * _oparams) 4139 { 4140 int err; 4141 4142 struct snd_pcm_hw_params *params __free(kfree) = 4143 kmalloc(sizeof(*params), GFP_KERNEL); 4144 if (!params) 4145 return -ENOMEM; 4146 4147 struct snd_pcm_hw_params_old *oparams __free(kfree) = 4148 memdup_user(_oparams, sizeof(*oparams)); 4149 if (IS_ERR(oparams)) 4150 return PTR_ERR(oparams); 4151 4152 snd_pcm_hw_convert_from_old_params(params, oparams); 4153 err = snd_pcm_hw_params(substream, params); 4154 if (err < 0) 4155 return err; 4156 4157 snd_pcm_hw_convert_to_old_params(oparams, params); 4158 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 4159 return -EFAULT; 4160 return 0; 4161 } 4162 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 4163 4164 #ifndef CONFIG_MMU 4165 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 4166 unsigned long addr, 4167 unsigned long len, 4168 unsigned long pgoff, 4169 unsigned long flags) 4170 { 4171 struct snd_pcm_file *pcm_file = file->private_data; 4172 struct snd_pcm_substream *substream = pcm_file->substream; 4173 struct snd_pcm_runtime *runtime = substream->runtime; 4174 unsigned long offset = pgoff << PAGE_SHIFT; 4175 4176 switch (offset) { 4177 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 4178 return (unsigned long)runtime->status; 4179 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 4180 return (unsigned long)runtime->control; 4181 default: 4182 return (unsigned long)runtime->dma_area + offset; 4183 } 4184 } 4185 #else 4186 # define snd_pcm_get_unmapped_area NULL 4187 #endif 4188 4189 /* 4190 * Register section 4191 */ 4192 4193 const struct file_operations snd_pcm_f_ops[2] = { 4194 { 4195 .owner = THIS_MODULE, 4196 .write = snd_pcm_write, 4197 .write_iter = snd_pcm_writev, 4198 .open = snd_pcm_playback_open, 4199 .release = snd_pcm_release, 4200 .poll = snd_pcm_poll, 4201 .unlocked_ioctl = snd_pcm_ioctl, 4202 .compat_ioctl = snd_pcm_ioctl_compat, 4203 .mmap = snd_pcm_mmap, 4204 .fasync = snd_pcm_fasync, 4205 .get_unmapped_area = snd_pcm_get_unmapped_area, 4206 }, 4207 { 4208 .owner = THIS_MODULE, 4209 .read = snd_pcm_read, 4210 .read_iter = snd_pcm_readv, 4211 .open = snd_pcm_capture_open, 4212 .release = snd_pcm_release, 4213 .poll = snd_pcm_poll, 4214 .unlocked_ioctl = snd_pcm_ioctl, 4215 .compat_ioctl = snd_pcm_ioctl_compat, 4216 .mmap = snd_pcm_mmap, 4217 .fasync = snd_pcm_fasync, 4218 .get_unmapped_area = snd_pcm_get_unmapped_area, 4219 } 4220 }; 4221