1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Digital Audio (PCM) abstract layer 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 */ 6 7#include <linux/compat.h> 8#include <linux/mm.h> 9#include <linux/module.h> 10#include <linux/file.h> 11#include <linux/slab.h> 12#include <linux/sched/signal.h> 13#include <linux/time.h> 14#include <linux/pm_qos.h> 15#include <linux/io.h> 16#include <linux/dma-mapping.h> 17#include <linux/vmalloc.h> 18#include <sound/core.h> 19#include <sound/control.h> 20#include <sound/info.h> 21#include <sound/pcm.h> 22#include <sound/pcm_params.h> 23#include <sound/timer.h> 24#include <sound/minors.h> 25#include <linux/uio.h> 26#include <linux/delay.h> 27 28#include "pcm_local.h" 29 30#ifdef CONFIG_SND_DEBUG 31#define CREATE_TRACE_POINTS 32#include "pcm_param_trace.h" 33#else 34#define trace_hw_mask_param_enabled() 0 35#define trace_hw_interval_param_enabled() 0 36#define trace_hw_mask_param(substream, type, index, prev, curr) 37#define trace_hw_interval_param(substream, type, index, prev, curr) 38#endif 39 40/* 41 * Compatibility 42 */ 43 44struct snd_pcm_hw_params_old { 45 unsigned int flags; 46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 47 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 50 unsigned int rmask; 51 unsigned int cmask; 52 unsigned int info; 53 unsigned int msbits; 54 unsigned int rate_num; 55 unsigned int rate_den; 56 snd_pcm_uframes_t fifo_size; 57 unsigned char reserved[64]; 58}; 59 60#ifdef CONFIG_SND_SUPPORT_OLD_API 61#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 62#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 63 64static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 65 struct snd_pcm_hw_params_old __user * _oparams); 66static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params_old __user * _oparams); 68#endif 69static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 70 71/* 72 * 73 */ 74 75static DECLARE_RWSEM(snd_pcm_link_rwsem); 76 77void snd_pcm_group_init(struct snd_pcm_group *group) 78{ 79 spin_lock_init(&group->lock); 80 mutex_init(&group->mutex); 81 INIT_LIST_HEAD(&group->substreams); 82 refcount_set(&group->refs, 1); 83} 84 85/* define group lock helpers */ 86#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 87static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 88{ \ 89 if (nonatomic) \ 90 mutex_ ## mutex_action(&group->mutex); \ 91 else \ 92 spin_ ## action(&group->lock); \ 93} 94 95DEFINE_PCM_GROUP_LOCK(lock, lock); 96DEFINE_PCM_GROUP_LOCK(unlock, unlock); 97DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 98DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 99 100/** 101 * snd_pcm_stream_lock - Lock the PCM stream 102 * @substream: PCM substream 103 * 104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 105 * flag of the given substream. This also takes the global link rw lock 106 * (or rw sem), too, for avoiding the race with linked streams. 107 */ 108void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 109{ 110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 111} 112EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 113 114/** 115 * snd_pcm_stream_unlock - Unlock the PCM stream 116 * @substream: PCM substream 117 * 118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 119 */ 120void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 121{ 122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 123} 124EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 125 126/** 127 * snd_pcm_stream_lock_irq - Lock the PCM stream 128 * @substream: PCM substream 129 * 130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 132 * as snd_pcm_stream_lock(). 133 */ 134void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 135{ 136 snd_pcm_group_lock_irq(&substream->self_group, 137 substream->pcm->nonatomic); 138} 139EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 140 141static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream) 142{ 143 struct snd_pcm_group *group = &substream->self_group; 144 145 if (substream->pcm->nonatomic) 146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING); 147 else 148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING); 149} 150 151/** 152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 153 * @substream: PCM substream 154 * 155 * This is a counter-part of snd_pcm_stream_lock_irq(). 156 */ 157void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 158{ 159 snd_pcm_group_unlock_irq(&substream->self_group, 160 substream->pcm->nonatomic); 161} 162EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 163 164unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 165{ 166 unsigned long flags = 0; 167 if (substream->pcm->nonatomic) 168 mutex_lock(&substream->self_group.mutex); 169 else 170 spin_lock_irqsave(&substream->self_group.lock, flags); 171 return flags; 172} 173EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 174 175unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream) 176{ 177 unsigned long flags = 0; 178 if (substream->pcm->nonatomic) 179 mutex_lock_nested(&substream->self_group.mutex, 180 SINGLE_DEPTH_NESTING); 181 else 182 spin_lock_irqsave_nested(&substream->self_group.lock, flags, 183 SINGLE_DEPTH_NESTING); 184 return flags; 185} 186EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested); 187 188/** 189 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 190 * @substream: PCM substream 191 * @flags: irq flags 192 * 193 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 194 */ 195void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 196 unsigned long flags) 197{ 198 if (substream->pcm->nonatomic) 199 mutex_unlock(&substream->self_group.mutex); 200 else 201 spin_unlock_irqrestore(&substream->self_group.lock, flags); 202} 203EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 204 205/* Run PCM ioctl ops */ 206static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream, 207 unsigned cmd, void *arg) 208{ 209 if (substream->ops->ioctl) 210 return substream->ops->ioctl(substream, cmd, arg); 211 else 212 return snd_pcm_lib_ioctl(substream, cmd, arg); 213} 214 215int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 216{ 217 struct snd_pcm *pcm = substream->pcm; 218 struct snd_pcm_str *pstr = substream->pstr; 219 220 memset(info, 0, sizeof(*info)); 221 info->card = pcm->card->number; 222 info->device = pcm->device; 223 info->stream = substream->stream; 224 info->subdevice = substream->number; 225 strscpy(info->id, pcm->id, sizeof(info->id)); 226 strscpy(info->name, pcm->name, sizeof(info->name)); 227 info->dev_class = pcm->dev_class; 228 info->dev_subclass = pcm->dev_subclass; 229 info->subdevices_count = pstr->substream_count; 230 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 231 strscpy(info->subname, substream->name, sizeof(info->subname)); 232 233 return 0; 234} 235 236int snd_pcm_info_user(struct snd_pcm_substream *substream, 237 struct snd_pcm_info __user * _info) 238{ 239 struct snd_pcm_info *info; 240 int err; 241 242 info = kmalloc(sizeof(*info), GFP_KERNEL); 243 if (! info) 244 return -ENOMEM; 245 err = snd_pcm_info(substream, info); 246 if (err >= 0) { 247 if (copy_to_user(_info, info, sizeof(*info))) 248 err = -EFAULT; 249 } 250 kfree(info); 251 return err; 252} 253 254/* macro for simplified cast */ 255#define PARAM_MASK_BIT(b) (1U << (__force int)(b)) 256 257static bool hw_support_mmap(struct snd_pcm_substream *substream) 258{ 259 struct snd_dma_buffer *dmabuf; 260 261 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 262 return false; 263 264 if (substream->ops->mmap || substream->ops->page) 265 return true; 266 267 dmabuf = snd_pcm_get_dma_buf(substream); 268 if (!dmabuf) 269 dmabuf = &substream->dma_buffer; 270 switch (dmabuf->dev.type) { 271 case SNDRV_DMA_TYPE_UNKNOWN: 272 /* we can't know the device, so just assume that the driver does 273 * everything right 274 */ 275 return true; 276 case SNDRV_DMA_TYPE_CONTINUOUS: 277 case SNDRV_DMA_TYPE_VMALLOC: 278 return true; 279 default: 280 return dma_can_mmap(dmabuf->dev.dev); 281 } 282} 283 284static int constrain_mask_params(struct snd_pcm_substream *substream, 285 struct snd_pcm_hw_params *params) 286{ 287 struct snd_pcm_hw_constraints *constrs = 288 &substream->runtime->hw_constraints; 289 struct snd_mask *m; 290 unsigned int k; 291 struct snd_mask old_mask __maybe_unused; 292 int changed; 293 294 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 295 m = hw_param_mask(params, k); 296 if (snd_mask_empty(m)) 297 return -EINVAL; 298 299 /* This parameter is not requested to change by a caller. */ 300 if (!(params->rmask & PARAM_MASK_BIT(k))) 301 continue; 302 303 if (trace_hw_mask_param_enabled()) 304 old_mask = *m; 305 306 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 307 if (changed < 0) 308 return changed; 309 if (changed == 0) 310 continue; 311 312 /* Set corresponding flag so that the caller gets it. */ 313 trace_hw_mask_param(substream, k, 0, &old_mask, m); 314 params->cmask |= PARAM_MASK_BIT(k); 315 } 316 317 return 0; 318} 319 320static int constrain_interval_params(struct snd_pcm_substream *substream, 321 struct snd_pcm_hw_params *params) 322{ 323 struct snd_pcm_hw_constraints *constrs = 324 &substream->runtime->hw_constraints; 325 struct snd_interval *i; 326 unsigned int k; 327 struct snd_interval old_interval __maybe_unused; 328 int changed; 329 330 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 331 i = hw_param_interval(params, k); 332 if (snd_interval_empty(i)) 333 return -EINVAL; 334 335 /* This parameter is not requested to change by a caller. */ 336 if (!(params->rmask & PARAM_MASK_BIT(k))) 337 continue; 338 339 if (trace_hw_interval_param_enabled()) 340 old_interval = *i; 341 342 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 343 if (changed < 0) 344 return changed; 345 if (changed == 0) 346 continue; 347 348 /* Set corresponding flag so that the caller gets it. */ 349 trace_hw_interval_param(substream, k, 0, &old_interval, i); 350 params->cmask |= PARAM_MASK_BIT(k); 351 } 352 353 return 0; 354} 355 356static int constrain_params_by_rules(struct snd_pcm_substream *substream, 357 struct snd_pcm_hw_params *params) 358{ 359 struct snd_pcm_hw_constraints *constrs = 360 &substream->runtime->hw_constraints; 361 unsigned int k; 362 unsigned int *rstamps; 363 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 364 unsigned int stamp; 365 struct snd_pcm_hw_rule *r; 366 unsigned int d; 367 struct snd_mask old_mask __maybe_unused; 368 struct snd_interval old_interval __maybe_unused; 369 bool again; 370 int changed, err = 0; 371 372 /* 373 * Each application of rule has own sequence number. 374 * 375 * Each member of 'rstamps' array represents the sequence number of 376 * recent application of corresponding rule. 377 */ 378 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 379 if (!rstamps) 380 return -ENOMEM; 381 382 /* 383 * Each member of 'vstamps' array represents the sequence number of 384 * recent application of rule in which corresponding parameters were 385 * changed. 386 * 387 * In initial state, elements corresponding to parameters requested by 388 * a caller is 1. For unrequested parameters, corresponding members 389 * have 0 so that the parameters are never changed anymore. 390 */ 391 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 392 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0; 393 394 /* Due to the above design, actual sequence number starts at 2. */ 395 stamp = 2; 396retry: 397 /* Apply all rules in order. */ 398 again = false; 399 for (k = 0; k < constrs->rules_num; k++) { 400 r = &constrs->rules[k]; 401 402 /* 403 * Check condition bits of this rule. When the rule has 404 * some condition bits, parameter without the bits is 405 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 406 * is an example of the condition bits. 407 */ 408 if (r->cond && !(r->cond & params->flags)) 409 continue; 410 411 /* 412 * The 'deps' array includes maximum four dependencies 413 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth 414 * member of this array is a sentinel and should be 415 * negative value. 416 * 417 * This rule should be processed in this time when dependent 418 * parameters were changed at former applications of the other 419 * rules. 420 */ 421 for (d = 0; r->deps[d] >= 0; d++) { 422 if (vstamps[r->deps[d]] > rstamps[k]) 423 break; 424 } 425 if (r->deps[d] < 0) 426 continue; 427 428 if (trace_hw_mask_param_enabled()) { 429 if (hw_is_mask(r->var)) 430 old_mask = *hw_param_mask(params, r->var); 431 } 432 if (trace_hw_interval_param_enabled()) { 433 if (hw_is_interval(r->var)) 434 old_interval = *hw_param_interval(params, r->var); 435 } 436 437 changed = r->func(params, r); 438 if (changed < 0) { 439 err = changed; 440 goto out; 441 } 442 443 /* 444 * When the parameter is changed, notify it to the caller 445 * by corresponding returned bit, then preparing for next 446 * iteration. 447 */ 448 if (changed && r->var >= 0) { 449 if (hw_is_mask(r->var)) { 450 trace_hw_mask_param(substream, r->var, 451 k + 1, &old_mask, 452 hw_param_mask(params, r->var)); 453 } 454 if (hw_is_interval(r->var)) { 455 trace_hw_interval_param(substream, r->var, 456 k + 1, &old_interval, 457 hw_param_interval(params, r->var)); 458 } 459 460 params->cmask |= PARAM_MASK_BIT(r->var); 461 vstamps[r->var] = stamp; 462 again = true; 463 } 464 465 rstamps[k] = stamp++; 466 } 467 468 /* Iterate to evaluate all rules till no parameters are changed. */ 469 if (again) 470 goto retry; 471 472 out: 473 kfree(rstamps); 474 return err; 475} 476 477static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 478 struct snd_pcm_hw_params *params) 479{ 480 const struct snd_interval *i; 481 const struct snd_mask *m; 482 int err; 483 484 if (!params->msbits) { 485 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 486 if (snd_interval_single(i)) 487 params->msbits = snd_interval_value(i); 488 } 489 490 if (!params->rate_den) { 491 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 492 if (snd_interval_single(i)) { 493 params->rate_num = snd_interval_value(i); 494 params->rate_den = 1; 495 } 496 } 497 498 if (!params->fifo_size) { 499 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 500 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 501 if (snd_mask_single(m) && snd_interval_single(i)) { 502 err = snd_pcm_ops_ioctl(substream, 503 SNDRV_PCM_IOCTL1_FIFO_SIZE, 504 params); 505 if (err < 0) 506 return err; 507 } 508 } 509 510 if (!params->info) { 511 params->info = substream->runtime->hw.info; 512 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 513 SNDRV_PCM_INFO_DRAIN_TRIGGER); 514 if (!hw_support_mmap(substream)) 515 params->info &= ~(SNDRV_PCM_INFO_MMAP | 516 SNDRV_PCM_INFO_MMAP_VALID); 517 } 518 519 return 0; 520} 521 522int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 523 struct snd_pcm_hw_params *params) 524{ 525 int err; 526 527 params->info = 0; 528 params->fifo_size = 0; 529 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 530 params->msbits = 0; 531 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) { 532 params->rate_num = 0; 533 params->rate_den = 0; 534 } 535 536 err = constrain_mask_params(substream, params); 537 if (err < 0) 538 return err; 539 540 err = constrain_interval_params(substream, params); 541 if (err < 0) 542 return err; 543 544 err = constrain_params_by_rules(substream, params); 545 if (err < 0) 546 return err; 547 548 params->rmask = 0; 549 550 return 0; 551} 552EXPORT_SYMBOL(snd_pcm_hw_refine); 553 554static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 555 struct snd_pcm_hw_params __user * _params) 556{ 557 struct snd_pcm_hw_params *params; 558 int err; 559 560 params = memdup_user(_params, sizeof(*params)); 561 if (IS_ERR(params)) 562 return PTR_ERR(params); 563 564 err = snd_pcm_hw_refine(substream, params); 565 if (err < 0) 566 goto end; 567 568 err = fixup_unreferenced_params(substream, params); 569 if (err < 0) 570 goto end; 571 572 if (copy_to_user(_params, params, sizeof(*params))) 573 err = -EFAULT; 574end: 575 kfree(params); 576 return err; 577} 578 579static int period_to_usecs(struct snd_pcm_runtime *runtime) 580{ 581 int usecs; 582 583 if (! runtime->rate) 584 return -1; /* invalid */ 585 586 /* take 75% of period time as the deadline */ 587 usecs = (750000 / runtime->rate) * runtime->period_size; 588 usecs += ((750000 % runtime->rate) * runtime->period_size) / 589 runtime->rate; 590 591 return usecs; 592} 593 594static void snd_pcm_set_state(struct snd_pcm_substream *substream, 595 snd_pcm_state_t state) 596{ 597 snd_pcm_stream_lock_irq(substream); 598 if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED) 599 __snd_pcm_set_state(substream->runtime, state); 600 snd_pcm_stream_unlock_irq(substream); 601} 602 603static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 604 int event) 605{ 606#ifdef CONFIG_SND_PCM_TIMER 607 if (substream->timer) 608 snd_timer_notify(substream->timer, event, 609 &substream->runtime->trigger_tstamp); 610#endif 611} 612 613void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq) 614{ 615 if (substream->runtime && substream->runtime->stop_operating) { 616 substream->runtime->stop_operating = false; 617 if (substream->ops && substream->ops->sync_stop) 618 substream->ops->sync_stop(substream); 619 else if (sync_irq && substream->pcm->card->sync_irq > 0) 620 synchronize_irq(substream->pcm->card->sync_irq); 621 } 622} 623 624/** 625 * snd_pcm_hw_params_choose - choose a configuration defined by @params 626 * @pcm: PCM instance 627 * @params: the hw_params instance 628 * 629 * Choose one configuration from configuration space defined by @params. 630 * The configuration chosen is that obtained fixing in this order: 631 * first access, first format, first subformat, min channels, 632 * min rate, min period time, max buffer size, min tick time 633 * 634 * Return: Zero if successful, or a negative error code on failure. 635 */ 636static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 637 struct snd_pcm_hw_params *params) 638{ 639 static const int vars[] = { 640 SNDRV_PCM_HW_PARAM_ACCESS, 641 SNDRV_PCM_HW_PARAM_FORMAT, 642 SNDRV_PCM_HW_PARAM_SUBFORMAT, 643 SNDRV_PCM_HW_PARAM_CHANNELS, 644 SNDRV_PCM_HW_PARAM_RATE, 645 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 646 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 647 SNDRV_PCM_HW_PARAM_TICK_TIME, 648 -1 649 }; 650 const int *v; 651 struct snd_mask old_mask __maybe_unused; 652 struct snd_interval old_interval __maybe_unused; 653 int changed; 654 655 for (v = vars; *v != -1; v++) { 656 /* Keep old parameter to trace. */ 657 if (trace_hw_mask_param_enabled()) { 658 if (hw_is_mask(*v)) 659 old_mask = *hw_param_mask(params, *v); 660 } 661 if (trace_hw_interval_param_enabled()) { 662 if (hw_is_interval(*v)) 663 old_interval = *hw_param_interval(params, *v); 664 } 665 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 666 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 667 else 668 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 669 if (changed < 0) 670 return changed; 671 if (changed == 0) 672 continue; 673 674 /* Trace the changed parameter. */ 675 if (hw_is_mask(*v)) { 676 trace_hw_mask_param(pcm, *v, 0, &old_mask, 677 hw_param_mask(params, *v)); 678 } 679 if (hw_is_interval(*v)) { 680 trace_hw_interval_param(pcm, *v, 0, &old_interval, 681 hw_param_interval(params, *v)); 682 } 683 } 684 685 return 0; 686} 687 688/* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise 689 * block the further r/w operations 690 */ 691static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime) 692{ 693 if (!atomic_dec_unless_positive(&runtime->buffer_accessing)) 694 return -EBUSY; 695 mutex_lock(&runtime->buffer_mutex); 696 return 0; /* keep buffer_mutex, unlocked by below */ 697} 698 699/* release buffer_mutex and clear r/w access flag */ 700static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime) 701{ 702 mutex_unlock(&runtime->buffer_mutex); 703 atomic_inc(&runtime->buffer_accessing); 704} 705 706#if IS_ENABLED(CONFIG_SND_PCM_OSS) 707#define is_oss_stream(substream) ((substream)->oss.oss) 708#else 709#define is_oss_stream(substream) false 710#endif 711 712static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 713 struct snd_pcm_hw_params *params) 714{ 715 struct snd_pcm_runtime *runtime; 716 int err, usecs; 717 unsigned int bits; 718 snd_pcm_uframes_t frames; 719 720 if (PCM_RUNTIME_CHECK(substream)) 721 return -ENXIO; 722 runtime = substream->runtime; 723 err = snd_pcm_buffer_access_lock(runtime); 724 if (err < 0) 725 return err; 726 snd_pcm_stream_lock_irq(substream); 727 switch (runtime->state) { 728 case SNDRV_PCM_STATE_OPEN: 729 case SNDRV_PCM_STATE_SETUP: 730 case SNDRV_PCM_STATE_PREPARED: 731 if (!is_oss_stream(substream) && 732 atomic_read(&substream->mmap_count)) 733 err = -EBADFD; 734 break; 735 default: 736 err = -EBADFD; 737 break; 738 } 739 snd_pcm_stream_unlock_irq(substream); 740 if (err) 741 goto unlock; 742 743 snd_pcm_sync_stop(substream, true); 744 745 params->rmask = ~0U; 746 err = snd_pcm_hw_refine(substream, params); 747 if (err < 0) 748 goto _error; 749 750 err = snd_pcm_hw_params_choose(substream, params); 751 if (err < 0) 752 goto _error; 753 754 err = fixup_unreferenced_params(substream, params); 755 if (err < 0) 756 goto _error; 757 758 if (substream->managed_buffer_alloc) { 759 err = snd_pcm_lib_malloc_pages(substream, 760 params_buffer_bytes(params)); 761 if (err < 0) 762 goto _error; 763 runtime->buffer_changed = err > 0; 764 } 765 766 if (substream->ops->hw_params != NULL) { 767 err = substream->ops->hw_params(substream, params); 768 if (err < 0) 769 goto _error; 770 } 771 772 runtime->access = params_access(params); 773 runtime->format = params_format(params); 774 runtime->subformat = params_subformat(params); 775 runtime->channels = params_channels(params); 776 runtime->rate = params_rate(params); 777 runtime->period_size = params_period_size(params); 778 runtime->periods = params_periods(params); 779 runtime->buffer_size = params_buffer_size(params); 780 runtime->info = params->info; 781 runtime->rate_num = params->rate_num; 782 runtime->rate_den = params->rate_den; 783 runtime->no_period_wakeup = 784 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 785 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 786 787 bits = snd_pcm_format_physical_width(runtime->format); 788 runtime->sample_bits = bits; 789 bits *= runtime->channels; 790 runtime->frame_bits = bits; 791 frames = 1; 792 while (bits % 8 != 0) { 793 bits *= 2; 794 frames *= 2; 795 } 796 runtime->byte_align = bits / 8; 797 runtime->min_align = frames; 798 799 /* Default sw params */ 800 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 801 runtime->period_step = 1; 802 runtime->control->avail_min = runtime->period_size; 803 runtime->start_threshold = 1; 804 runtime->stop_threshold = runtime->buffer_size; 805 runtime->silence_threshold = 0; 806 runtime->silence_size = 0; 807 runtime->boundary = runtime->buffer_size; 808 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 809 runtime->boundary *= 2; 810 811 /* clear the buffer for avoiding possible kernel info leaks */ 812 if (runtime->dma_area && !substream->ops->copy) { 813 size_t size = runtime->dma_bytes; 814 815 if (runtime->info & SNDRV_PCM_INFO_MMAP) 816 size = PAGE_ALIGN(size); 817 memset(runtime->dma_area, 0, size); 818 } 819 820 snd_pcm_timer_resolution_change(substream); 821 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 822 823 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 824 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 825 usecs = period_to_usecs(runtime); 826 if (usecs >= 0) 827 cpu_latency_qos_add_request(&substream->latency_pm_qos_req, 828 usecs); 829 err = 0; 830 _error: 831 if (err) { 832 /* hardware might be unusable from this time, 833 * so we force application to retry to set 834 * the correct hardware parameter settings 835 */ 836 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 837 if (substream->ops->hw_free != NULL) 838 substream->ops->hw_free(substream); 839 if (substream->managed_buffer_alloc) 840 snd_pcm_lib_free_pages(substream); 841 } 842 unlock: 843 snd_pcm_buffer_access_unlock(runtime); 844 return err; 845} 846 847static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 848 struct snd_pcm_hw_params __user * _params) 849{ 850 struct snd_pcm_hw_params *params; 851 int err; 852 853 params = memdup_user(_params, sizeof(*params)); 854 if (IS_ERR(params)) 855 return PTR_ERR(params); 856 857 err = snd_pcm_hw_params(substream, params); 858 if (err < 0) 859 goto end; 860 861 if (copy_to_user(_params, params, sizeof(*params))) 862 err = -EFAULT; 863end: 864 kfree(params); 865 return err; 866} 867 868static int do_hw_free(struct snd_pcm_substream *substream) 869{ 870 int result = 0; 871 872 snd_pcm_sync_stop(substream, true); 873 if (substream->ops->hw_free) 874 result = substream->ops->hw_free(substream); 875 if (substream->managed_buffer_alloc) 876 snd_pcm_lib_free_pages(substream); 877 return result; 878} 879 880static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 881{ 882 struct snd_pcm_runtime *runtime; 883 int result = 0; 884 885 if (PCM_RUNTIME_CHECK(substream)) 886 return -ENXIO; 887 runtime = substream->runtime; 888 result = snd_pcm_buffer_access_lock(runtime); 889 if (result < 0) 890 return result; 891 snd_pcm_stream_lock_irq(substream); 892 switch (runtime->state) { 893 case SNDRV_PCM_STATE_SETUP: 894 case SNDRV_PCM_STATE_PREPARED: 895 if (atomic_read(&substream->mmap_count)) 896 result = -EBADFD; 897 break; 898 default: 899 result = -EBADFD; 900 break; 901 } 902 snd_pcm_stream_unlock_irq(substream); 903 if (result) 904 goto unlock; 905 result = do_hw_free(substream); 906 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 907 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 908 unlock: 909 snd_pcm_buffer_access_unlock(runtime); 910 return result; 911} 912 913static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 914 struct snd_pcm_sw_params *params) 915{ 916 struct snd_pcm_runtime *runtime; 917 int err; 918 919 if (PCM_RUNTIME_CHECK(substream)) 920 return -ENXIO; 921 runtime = substream->runtime; 922 snd_pcm_stream_lock_irq(substream); 923 if (runtime->state == SNDRV_PCM_STATE_OPEN) { 924 snd_pcm_stream_unlock_irq(substream); 925 return -EBADFD; 926 } 927 snd_pcm_stream_unlock_irq(substream); 928 929 if (params->tstamp_mode < 0 || 930 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 931 return -EINVAL; 932 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 933 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 934 return -EINVAL; 935 if (params->avail_min == 0) 936 return -EINVAL; 937 if (params->silence_size >= runtime->boundary) { 938 if (params->silence_threshold != 0) 939 return -EINVAL; 940 } else { 941 if (params->silence_size > params->silence_threshold) 942 return -EINVAL; 943 if (params->silence_threshold > runtime->buffer_size) 944 return -EINVAL; 945 } 946 err = 0; 947 snd_pcm_stream_lock_irq(substream); 948 runtime->tstamp_mode = params->tstamp_mode; 949 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 950 runtime->tstamp_type = params->tstamp_type; 951 runtime->period_step = params->period_step; 952 runtime->control->avail_min = params->avail_min; 953 runtime->start_threshold = params->start_threshold; 954 runtime->stop_threshold = params->stop_threshold; 955 runtime->silence_threshold = params->silence_threshold; 956 runtime->silence_size = params->silence_size; 957 params->boundary = runtime->boundary; 958 if (snd_pcm_running(substream)) { 959 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 960 runtime->silence_size > 0) 961 snd_pcm_playback_silence(substream, ULONG_MAX); 962 err = snd_pcm_update_state(substream, runtime); 963 } 964 snd_pcm_stream_unlock_irq(substream); 965 return err; 966} 967 968static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 969 struct snd_pcm_sw_params __user * _params) 970{ 971 struct snd_pcm_sw_params params; 972 int err; 973 if (copy_from_user(¶ms, _params, sizeof(params))) 974 return -EFAULT; 975 err = snd_pcm_sw_params(substream, ¶ms); 976 if (copy_to_user(_params, ¶ms, sizeof(params))) 977 return -EFAULT; 978 return err; 979} 980 981static inline snd_pcm_uframes_t 982snd_pcm_calc_delay(struct snd_pcm_substream *substream) 983{ 984 snd_pcm_uframes_t delay; 985 986 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 987 delay = snd_pcm_playback_hw_avail(substream->runtime); 988 else 989 delay = snd_pcm_capture_avail(substream->runtime); 990 return delay + substream->runtime->delay; 991} 992 993int snd_pcm_status64(struct snd_pcm_substream *substream, 994 struct snd_pcm_status64 *status) 995{ 996 struct snd_pcm_runtime *runtime = substream->runtime; 997 998 snd_pcm_stream_lock_irq(substream); 999 1000 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 1001 &runtime->audio_tstamp_config); 1002 1003 /* backwards compatible behavior */ 1004 if (runtime->audio_tstamp_config.type_requested == 1005 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 1006 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 1007 runtime->audio_tstamp_config.type_requested = 1008 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 1009 else 1010 runtime->audio_tstamp_config.type_requested = 1011 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 1012 runtime->audio_tstamp_report.valid = 0; 1013 } else 1014 runtime->audio_tstamp_report.valid = 1; 1015 1016 status->state = runtime->state; 1017 status->suspended_state = runtime->suspended_state; 1018 if (status->state == SNDRV_PCM_STATE_OPEN) 1019 goto _end; 1020 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec; 1021 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec; 1022 if (snd_pcm_running(substream)) { 1023 snd_pcm_update_hw_ptr(substream); 1024 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 1025 status->tstamp_sec = runtime->status->tstamp.tv_sec; 1026 status->tstamp_nsec = 1027 runtime->status->tstamp.tv_nsec; 1028 status->driver_tstamp_sec = 1029 runtime->driver_tstamp.tv_sec; 1030 status->driver_tstamp_nsec = 1031 runtime->driver_tstamp.tv_nsec; 1032 status->audio_tstamp_sec = 1033 runtime->status->audio_tstamp.tv_sec; 1034 status->audio_tstamp_nsec = 1035 runtime->status->audio_tstamp.tv_nsec; 1036 if (runtime->audio_tstamp_report.valid == 1) 1037 /* backwards compatibility, no report provided in COMPAT mode */ 1038 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 1039 &status->audio_tstamp_accuracy, 1040 &runtime->audio_tstamp_report); 1041 1042 goto _tstamp_end; 1043 } 1044 } else { 1045 /* get tstamp only in fallback mode and only if enabled */ 1046 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 1047 struct timespec64 tstamp; 1048 1049 snd_pcm_gettime(runtime, &tstamp); 1050 status->tstamp_sec = tstamp.tv_sec; 1051 status->tstamp_nsec = tstamp.tv_nsec; 1052 } 1053 } 1054 _tstamp_end: 1055 status->appl_ptr = runtime->control->appl_ptr; 1056 status->hw_ptr = runtime->status->hw_ptr; 1057 status->avail = snd_pcm_avail(substream); 1058 status->delay = snd_pcm_running(substream) ? 1059 snd_pcm_calc_delay(substream) : 0; 1060 status->avail_max = runtime->avail_max; 1061 status->overrange = runtime->overrange; 1062 runtime->avail_max = 0; 1063 runtime->overrange = 0; 1064 _end: 1065 snd_pcm_stream_unlock_irq(substream); 1066 return 0; 1067} 1068 1069static int snd_pcm_status_user64(struct snd_pcm_substream *substream, 1070 struct snd_pcm_status64 __user * _status, 1071 bool ext) 1072{ 1073 struct snd_pcm_status64 status; 1074 int res; 1075 1076 memset(&status, 0, sizeof(status)); 1077 /* 1078 * with extension, parameters are read/write, 1079 * get audio_tstamp_data from user, 1080 * ignore rest of status structure 1081 */ 1082 if (ext && get_user(status.audio_tstamp_data, 1083 (u32 __user *)(&_status->audio_tstamp_data))) 1084 return -EFAULT; 1085 res = snd_pcm_status64(substream, &status); 1086 if (res < 0) 1087 return res; 1088 if (copy_to_user(_status, &status, sizeof(status))) 1089 return -EFAULT; 1090 return 0; 1091} 1092 1093static int snd_pcm_status_user32(struct snd_pcm_substream *substream, 1094 struct snd_pcm_status32 __user * _status, 1095 bool ext) 1096{ 1097 struct snd_pcm_status64 status64; 1098 struct snd_pcm_status32 status32; 1099 int res; 1100 1101 memset(&status64, 0, sizeof(status64)); 1102 memset(&status32, 0, sizeof(status32)); 1103 /* 1104 * with extension, parameters are read/write, 1105 * get audio_tstamp_data from user, 1106 * ignore rest of status structure 1107 */ 1108 if (ext && get_user(status64.audio_tstamp_data, 1109 (u32 __user *)(&_status->audio_tstamp_data))) 1110 return -EFAULT; 1111 res = snd_pcm_status64(substream, &status64); 1112 if (res < 0) 1113 return res; 1114 1115 status32 = (struct snd_pcm_status32) { 1116 .state = status64.state, 1117 .trigger_tstamp_sec = status64.trigger_tstamp_sec, 1118 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec, 1119 .tstamp_sec = status64.tstamp_sec, 1120 .tstamp_nsec = status64.tstamp_nsec, 1121 .appl_ptr = status64.appl_ptr, 1122 .hw_ptr = status64.hw_ptr, 1123 .delay = status64.delay, 1124 .avail = status64.avail, 1125 .avail_max = status64.avail_max, 1126 .overrange = status64.overrange, 1127 .suspended_state = status64.suspended_state, 1128 .audio_tstamp_data = status64.audio_tstamp_data, 1129 .audio_tstamp_sec = status64.audio_tstamp_sec, 1130 .audio_tstamp_nsec = status64.audio_tstamp_nsec, 1131 .driver_tstamp_sec = status64.audio_tstamp_sec, 1132 .driver_tstamp_nsec = status64.audio_tstamp_nsec, 1133 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy, 1134 }; 1135 1136 if (copy_to_user(_status, &status32, sizeof(status32))) 1137 return -EFAULT; 1138 1139 return 0; 1140} 1141 1142static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 1143 struct snd_pcm_channel_info * info) 1144{ 1145 struct snd_pcm_runtime *runtime; 1146 unsigned int channel; 1147 1148 channel = info->channel; 1149 runtime = substream->runtime; 1150 snd_pcm_stream_lock_irq(substream); 1151 if (runtime->state == SNDRV_PCM_STATE_OPEN) { 1152 snd_pcm_stream_unlock_irq(substream); 1153 return -EBADFD; 1154 } 1155 snd_pcm_stream_unlock_irq(substream); 1156 if (channel >= runtime->channels) 1157 return -EINVAL; 1158 memset(info, 0, sizeof(*info)); 1159 info->channel = channel; 1160 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1161} 1162 1163static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1164 struct snd_pcm_channel_info __user * _info) 1165{ 1166 struct snd_pcm_channel_info info; 1167 int res; 1168 1169 if (copy_from_user(&info, _info, sizeof(info))) 1170 return -EFAULT; 1171 res = snd_pcm_channel_info(substream, &info); 1172 if (res < 0) 1173 return res; 1174 if (copy_to_user(_info, &info, sizeof(info))) 1175 return -EFAULT; 1176 return 0; 1177} 1178 1179static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1180{ 1181 struct snd_pcm_runtime *runtime = substream->runtime; 1182 if (runtime->trigger_master == NULL) 1183 return; 1184 if (runtime->trigger_master == substream) { 1185 if (!runtime->trigger_tstamp_latched) 1186 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1187 } else { 1188 snd_pcm_trigger_tstamp(runtime->trigger_master); 1189 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1190 } 1191 runtime->trigger_master = NULL; 1192} 1193 1194#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0 1195 1196struct action_ops { 1197 int (*pre_action)(struct snd_pcm_substream *substream, 1198 snd_pcm_state_t state); 1199 int (*do_action)(struct snd_pcm_substream *substream, 1200 snd_pcm_state_t state); 1201 void (*undo_action)(struct snd_pcm_substream *substream, 1202 snd_pcm_state_t state); 1203 void (*post_action)(struct snd_pcm_substream *substream, 1204 snd_pcm_state_t state); 1205}; 1206 1207/* 1208 * this functions is core for handling of linked stream 1209 * Note: the stream state might be changed also on failure 1210 * Note2: call with calling stream lock + link lock 1211 */ 1212static int snd_pcm_action_group(const struct action_ops *ops, 1213 struct snd_pcm_substream *substream, 1214 snd_pcm_state_t state, 1215 bool stream_lock) 1216{ 1217 struct snd_pcm_substream *s = NULL; 1218 struct snd_pcm_substream *s1; 1219 int res = 0, depth = 1; 1220 1221 snd_pcm_group_for_each_entry(s, substream) { 1222 if (s != substream) { 1223 if (!stream_lock) 1224 mutex_lock_nested(&s->runtime->buffer_mutex, depth); 1225 else if (s->pcm->nonatomic) 1226 mutex_lock_nested(&s->self_group.mutex, depth); 1227 else 1228 spin_lock_nested(&s->self_group.lock, depth); 1229 depth++; 1230 } 1231 res = ops->pre_action(s, state); 1232 if (res < 0) 1233 goto _unlock; 1234 } 1235 snd_pcm_group_for_each_entry(s, substream) { 1236 res = ops->do_action(s, state); 1237 if (res < 0) { 1238 if (ops->undo_action) { 1239 snd_pcm_group_for_each_entry(s1, substream) { 1240 if (s1 == s) /* failed stream */ 1241 break; 1242 ops->undo_action(s1, state); 1243 } 1244 } 1245 s = NULL; /* unlock all */ 1246 goto _unlock; 1247 } 1248 } 1249 snd_pcm_group_for_each_entry(s, substream) { 1250 ops->post_action(s, state); 1251 } 1252 _unlock: 1253 /* unlock streams */ 1254 snd_pcm_group_for_each_entry(s1, substream) { 1255 if (s1 != substream) { 1256 if (!stream_lock) 1257 mutex_unlock(&s1->runtime->buffer_mutex); 1258 else if (s1->pcm->nonatomic) 1259 mutex_unlock(&s1->self_group.mutex); 1260 else 1261 spin_unlock(&s1->self_group.lock); 1262 } 1263 if (s1 == s) /* end */ 1264 break; 1265 } 1266 return res; 1267} 1268 1269/* 1270 * Note: call with stream lock 1271 */ 1272static int snd_pcm_action_single(const struct action_ops *ops, 1273 struct snd_pcm_substream *substream, 1274 snd_pcm_state_t state) 1275{ 1276 int res; 1277 1278 res = ops->pre_action(substream, state); 1279 if (res < 0) 1280 return res; 1281 res = ops->do_action(substream, state); 1282 if (res == 0) 1283 ops->post_action(substream, state); 1284 else if (ops->undo_action) 1285 ops->undo_action(substream, state); 1286 return res; 1287} 1288 1289static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1290 struct snd_pcm_group *new_group) 1291{ 1292 substream->group = new_group; 1293 list_move(&substream->link_list, &new_group->substreams); 1294} 1295 1296/* 1297 * Unref and unlock the group, but keep the stream lock; 1298 * when the group becomes empty and no longer referred, destroy itself 1299 */ 1300static void snd_pcm_group_unref(struct snd_pcm_group *group, 1301 struct snd_pcm_substream *substream) 1302{ 1303 bool do_free; 1304 1305 if (!group) 1306 return; 1307 do_free = refcount_dec_and_test(&group->refs); 1308 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1309 if (do_free) 1310 kfree(group); 1311} 1312 1313/* 1314 * Lock the group inside a stream lock and reference it; 1315 * return the locked group object, or NULL if not linked 1316 */ 1317static struct snd_pcm_group * 1318snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1319{ 1320 bool nonatomic = substream->pcm->nonatomic; 1321 struct snd_pcm_group *group; 1322 bool trylock; 1323 1324 for (;;) { 1325 if (!snd_pcm_stream_linked(substream)) 1326 return NULL; 1327 group = substream->group; 1328 /* block freeing the group object */ 1329 refcount_inc(&group->refs); 1330 1331 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1332 spin_trylock(&group->lock); 1333 if (trylock) 1334 break; /* OK */ 1335 1336 /* re-lock for avoiding ABBA deadlock */ 1337 snd_pcm_stream_unlock(substream); 1338 snd_pcm_group_lock(group, nonatomic); 1339 snd_pcm_stream_lock(substream); 1340 1341 /* check the group again; the above opens a small race window */ 1342 if (substream->group == group) 1343 break; /* OK */ 1344 /* group changed, try again */ 1345 snd_pcm_group_unref(group, substream); 1346 } 1347 return group; 1348} 1349 1350/* 1351 * Note: call with stream lock 1352 */ 1353static int snd_pcm_action(const struct action_ops *ops, 1354 struct snd_pcm_substream *substream, 1355 snd_pcm_state_t state) 1356{ 1357 struct snd_pcm_group *group; 1358 int res; 1359 1360 group = snd_pcm_stream_group_ref(substream); 1361 if (group) 1362 res = snd_pcm_action_group(ops, substream, state, true); 1363 else 1364 res = snd_pcm_action_single(ops, substream, state); 1365 snd_pcm_group_unref(group, substream); 1366 return res; 1367} 1368 1369/* 1370 * Note: don't use any locks before 1371 */ 1372static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1373 struct snd_pcm_substream *substream, 1374 snd_pcm_state_t state) 1375{ 1376 int res; 1377 1378 snd_pcm_stream_lock_irq(substream); 1379 res = snd_pcm_action(ops, substream, state); 1380 snd_pcm_stream_unlock_irq(substream); 1381 return res; 1382} 1383 1384/* 1385 */ 1386static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1387 struct snd_pcm_substream *substream, 1388 snd_pcm_state_t state) 1389{ 1390 int res; 1391 1392 /* Guarantee the group members won't change during non-atomic action */ 1393 down_read(&snd_pcm_link_rwsem); 1394 res = snd_pcm_buffer_access_lock(substream->runtime); 1395 if (res < 0) 1396 goto unlock; 1397 if (snd_pcm_stream_linked(substream)) 1398 res = snd_pcm_action_group(ops, substream, state, false); 1399 else 1400 res = snd_pcm_action_single(ops, substream, state); 1401 snd_pcm_buffer_access_unlock(substream->runtime); 1402 unlock: 1403 up_read(&snd_pcm_link_rwsem); 1404 return res; 1405} 1406 1407/* 1408 * start callbacks 1409 */ 1410static int snd_pcm_pre_start(struct snd_pcm_substream *substream, 1411 snd_pcm_state_t state) 1412{ 1413 struct snd_pcm_runtime *runtime = substream->runtime; 1414 if (runtime->state != SNDRV_PCM_STATE_PREPARED) 1415 return -EBADFD; 1416 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1417 !snd_pcm_playback_data(substream)) 1418 return -EPIPE; 1419 runtime->trigger_tstamp_latched = false; 1420 runtime->trigger_master = substream; 1421 return 0; 1422} 1423 1424static int snd_pcm_do_start(struct snd_pcm_substream *substream, 1425 snd_pcm_state_t state) 1426{ 1427 int err; 1428 1429 if (substream->runtime->trigger_master != substream) 1430 return 0; 1431 err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1432 /* XRUN happened during the start */ 1433 if (err == -EPIPE) 1434 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN); 1435 return err; 1436} 1437 1438static void snd_pcm_undo_start(struct snd_pcm_substream *substream, 1439 snd_pcm_state_t state) 1440{ 1441 if (substream->runtime->trigger_master == substream) { 1442 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1443 substream->runtime->stop_operating = true; 1444 } 1445} 1446 1447static void snd_pcm_post_start(struct snd_pcm_substream *substream, 1448 snd_pcm_state_t state) 1449{ 1450 struct snd_pcm_runtime *runtime = substream->runtime; 1451 snd_pcm_trigger_tstamp(substream); 1452 runtime->hw_ptr_jiffies = jiffies; 1453 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1454 runtime->rate; 1455 __snd_pcm_set_state(runtime, state); 1456 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1457 runtime->silence_size > 0) 1458 snd_pcm_playback_silence(substream, ULONG_MAX); 1459 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1460} 1461 1462static const struct action_ops snd_pcm_action_start = { 1463 .pre_action = snd_pcm_pre_start, 1464 .do_action = snd_pcm_do_start, 1465 .undo_action = snd_pcm_undo_start, 1466 .post_action = snd_pcm_post_start 1467}; 1468 1469/** 1470 * snd_pcm_start - start all linked streams 1471 * @substream: the PCM substream instance 1472 * 1473 * Return: Zero if successful, or a negative error code. 1474 * The stream lock must be acquired before calling this function. 1475 */ 1476int snd_pcm_start(struct snd_pcm_substream *substream) 1477{ 1478 return snd_pcm_action(&snd_pcm_action_start, substream, 1479 SNDRV_PCM_STATE_RUNNING); 1480} 1481 1482/* take the stream lock and start the streams */ 1483static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1484{ 1485 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1486 SNDRV_PCM_STATE_RUNNING); 1487} 1488 1489/* 1490 * stop callbacks 1491 */ 1492static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, 1493 snd_pcm_state_t state) 1494{ 1495 struct snd_pcm_runtime *runtime = substream->runtime; 1496 if (runtime->state == SNDRV_PCM_STATE_OPEN) 1497 return -EBADFD; 1498 runtime->trigger_master = substream; 1499 return 0; 1500} 1501 1502static int snd_pcm_do_stop(struct snd_pcm_substream *substream, 1503 snd_pcm_state_t state) 1504{ 1505 if (substream->runtime->trigger_master == substream && 1506 snd_pcm_running(substream)) { 1507 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1508 substream->runtime->stop_operating = true; 1509 } 1510 return 0; /* unconditionally stop all substreams */ 1511} 1512 1513static void snd_pcm_post_stop(struct snd_pcm_substream *substream, 1514 snd_pcm_state_t state) 1515{ 1516 struct snd_pcm_runtime *runtime = substream->runtime; 1517 if (runtime->state != state) { 1518 snd_pcm_trigger_tstamp(substream); 1519 __snd_pcm_set_state(runtime, state); 1520 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1521 } 1522 wake_up(&runtime->sleep); 1523 wake_up(&runtime->tsleep); 1524} 1525 1526static const struct action_ops snd_pcm_action_stop = { 1527 .pre_action = snd_pcm_pre_stop, 1528 .do_action = snd_pcm_do_stop, 1529 .post_action = snd_pcm_post_stop 1530}; 1531 1532/** 1533 * snd_pcm_stop - try to stop all running streams in the substream group 1534 * @substream: the PCM substream instance 1535 * @state: PCM state after stopping the stream 1536 * 1537 * The state of each stream is then changed to the given state unconditionally. 1538 * 1539 * Return: Zero if successful, or a negative error code. 1540 */ 1541int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1542{ 1543 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1544} 1545EXPORT_SYMBOL(snd_pcm_stop); 1546 1547/** 1548 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1549 * @substream: the PCM substream 1550 * 1551 * After stopping, the state is changed to SETUP. 1552 * Unlike snd_pcm_stop(), this affects only the given stream. 1553 * 1554 * Return: Zero if successful, or a negative error code. 1555 */ 1556int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1557{ 1558 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1559 SNDRV_PCM_STATE_SETUP); 1560} 1561 1562/** 1563 * snd_pcm_stop_xrun - stop the running streams as XRUN 1564 * @substream: the PCM substream instance 1565 * 1566 * This stops the given running substream (and all linked substreams) as XRUN. 1567 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1568 * 1569 * Return: Zero if successful, or a negative error code. 1570 */ 1571int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1572{ 1573 unsigned long flags; 1574 1575 snd_pcm_stream_lock_irqsave(substream, flags); 1576 if (substream->runtime && snd_pcm_running(substream)) 1577 __snd_pcm_xrun(substream); 1578 snd_pcm_stream_unlock_irqrestore(substream, flags); 1579 return 0; 1580} 1581EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1582 1583/* 1584 * pause callbacks: pass boolean (to start pause or resume) as state argument 1585 */ 1586#define pause_pushed(state) (__force bool)(state) 1587 1588static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, 1589 snd_pcm_state_t state) 1590{ 1591 struct snd_pcm_runtime *runtime = substream->runtime; 1592 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1593 return -ENOSYS; 1594 if (pause_pushed(state)) { 1595 if (runtime->state != SNDRV_PCM_STATE_RUNNING) 1596 return -EBADFD; 1597 } else if (runtime->state != SNDRV_PCM_STATE_PAUSED) 1598 return -EBADFD; 1599 runtime->trigger_master = substream; 1600 return 0; 1601} 1602 1603static int snd_pcm_do_pause(struct snd_pcm_substream *substream, 1604 snd_pcm_state_t state) 1605{ 1606 if (substream->runtime->trigger_master != substream) 1607 return 0; 1608 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1609 * a delta between the current jiffies, this gives a large enough 1610 * delta, effectively to skip the check once. 1611 */ 1612 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1613 return substream->ops->trigger(substream, 1614 pause_pushed(state) ? 1615 SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1616 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1617} 1618 1619static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, 1620 snd_pcm_state_t state) 1621{ 1622 if (substream->runtime->trigger_master == substream) 1623 substream->ops->trigger(substream, 1624 pause_pushed(state) ? 1625 SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1626 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1627} 1628 1629static void snd_pcm_post_pause(struct snd_pcm_substream *substream, 1630 snd_pcm_state_t state) 1631{ 1632 struct snd_pcm_runtime *runtime = substream->runtime; 1633 snd_pcm_trigger_tstamp(substream); 1634 if (pause_pushed(state)) { 1635 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED); 1636 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1637 wake_up(&runtime->sleep); 1638 wake_up(&runtime->tsleep); 1639 } else { 1640 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING); 1641 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1642 } 1643} 1644 1645static const struct action_ops snd_pcm_action_pause = { 1646 .pre_action = snd_pcm_pre_pause, 1647 .do_action = snd_pcm_do_pause, 1648 .undo_action = snd_pcm_undo_pause, 1649 .post_action = snd_pcm_post_pause 1650}; 1651 1652/* 1653 * Push/release the pause for all linked streams. 1654 */ 1655static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push) 1656{ 1657 return snd_pcm_action(&snd_pcm_action_pause, substream, 1658 (__force snd_pcm_state_t)push); 1659} 1660 1661static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream, 1662 bool push) 1663{ 1664 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream, 1665 (__force snd_pcm_state_t)push); 1666} 1667 1668#ifdef CONFIG_PM 1669/* suspend callback: state argument ignored */ 1670 1671static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, 1672 snd_pcm_state_t state) 1673{ 1674 struct snd_pcm_runtime *runtime = substream->runtime; 1675 switch (runtime->state) { 1676 case SNDRV_PCM_STATE_SUSPENDED: 1677 return -EBUSY; 1678 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1679 case SNDRV_PCM_STATE_OPEN: 1680 case SNDRV_PCM_STATE_SETUP: 1681 case SNDRV_PCM_STATE_DISCONNECTED: 1682 return -EBUSY; 1683 } 1684 runtime->trigger_master = substream; 1685 return 0; 1686} 1687 1688static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, 1689 snd_pcm_state_t state) 1690{ 1691 struct snd_pcm_runtime *runtime = substream->runtime; 1692 if (runtime->trigger_master != substream) 1693 return 0; 1694 if (! snd_pcm_running(substream)) 1695 return 0; 1696 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1697 runtime->stop_operating = true; 1698 return 0; /* suspend unconditionally */ 1699} 1700 1701static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, 1702 snd_pcm_state_t state) 1703{ 1704 struct snd_pcm_runtime *runtime = substream->runtime; 1705 snd_pcm_trigger_tstamp(substream); 1706 runtime->suspended_state = runtime->state; 1707 runtime->status->suspended_state = runtime->suspended_state; 1708 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED); 1709 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1710 wake_up(&runtime->sleep); 1711 wake_up(&runtime->tsleep); 1712} 1713 1714static const struct action_ops snd_pcm_action_suspend = { 1715 .pre_action = snd_pcm_pre_suspend, 1716 .do_action = snd_pcm_do_suspend, 1717 .post_action = snd_pcm_post_suspend 1718}; 1719 1720/* 1721 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1722 * @substream: the PCM substream 1723 * 1724 * After this call, all streams are changed to SUSPENDED state. 1725 * 1726 * Return: Zero if successful, or a negative error code. 1727 */ 1728static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1729{ 1730 int err; 1731 unsigned long flags; 1732 1733 snd_pcm_stream_lock_irqsave(substream, flags); 1734 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 1735 ACTION_ARG_IGNORE); 1736 snd_pcm_stream_unlock_irqrestore(substream, flags); 1737 return err; 1738} 1739 1740/** 1741 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1742 * @pcm: the PCM instance 1743 * 1744 * After this call, all streams are changed to SUSPENDED state. 1745 * 1746 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1747 */ 1748int snd_pcm_suspend_all(struct snd_pcm *pcm) 1749{ 1750 struct snd_pcm_substream *substream; 1751 int stream, err = 0; 1752 1753 if (! pcm) 1754 return 0; 1755 1756 for_each_pcm_substream(pcm, stream, substream) { 1757 /* FIXME: the open/close code should lock this as well */ 1758 if (!substream->runtime) 1759 continue; 1760 1761 /* 1762 * Skip BE dai link PCM's that are internal and may 1763 * not have their substream ops set. 1764 */ 1765 if (!substream->ops) 1766 continue; 1767 1768 err = snd_pcm_suspend(substream); 1769 if (err < 0 && err != -EBUSY) 1770 return err; 1771 } 1772 1773 for_each_pcm_substream(pcm, stream, substream) 1774 snd_pcm_sync_stop(substream, false); 1775 1776 return 0; 1777} 1778EXPORT_SYMBOL(snd_pcm_suspend_all); 1779 1780/* resume callbacks: state argument ignored */ 1781 1782static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, 1783 snd_pcm_state_t state) 1784{ 1785 struct snd_pcm_runtime *runtime = substream->runtime; 1786 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1787 return -ENOSYS; 1788 runtime->trigger_master = substream; 1789 return 0; 1790} 1791 1792static int snd_pcm_do_resume(struct snd_pcm_substream *substream, 1793 snd_pcm_state_t state) 1794{ 1795 struct snd_pcm_runtime *runtime = substream->runtime; 1796 if (runtime->trigger_master != substream) 1797 return 0; 1798 /* DMA not running previously? */ 1799 if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING && 1800 (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING || 1801 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1802 return 0; 1803 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1804} 1805 1806static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, 1807 snd_pcm_state_t state) 1808{ 1809 if (substream->runtime->trigger_master == substream && 1810 snd_pcm_running(substream)) 1811 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1812} 1813 1814static void snd_pcm_post_resume(struct snd_pcm_substream *substream, 1815 snd_pcm_state_t state) 1816{ 1817 struct snd_pcm_runtime *runtime = substream->runtime; 1818 snd_pcm_trigger_tstamp(substream); 1819 __snd_pcm_set_state(runtime, runtime->suspended_state); 1820 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1821} 1822 1823static const struct action_ops snd_pcm_action_resume = { 1824 .pre_action = snd_pcm_pre_resume, 1825 .do_action = snd_pcm_do_resume, 1826 .undo_action = snd_pcm_undo_resume, 1827 .post_action = snd_pcm_post_resume 1828}; 1829 1830static int snd_pcm_resume(struct snd_pcm_substream *substream) 1831{ 1832 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 1833 ACTION_ARG_IGNORE); 1834} 1835 1836#else 1837 1838static int snd_pcm_resume(struct snd_pcm_substream *substream) 1839{ 1840 return -ENOSYS; 1841} 1842 1843#endif /* CONFIG_PM */ 1844 1845/* 1846 * xrun ioctl 1847 * 1848 * Change the RUNNING stream(s) to XRUN state. 1849 */ 1850static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1851{ 1852 struct snd_pcm_runtime *runtime = substream->runtime; 1853 int result; 1854 1855 snd_pcm_stream_lock_irq(substream); 1856 switch (runtime->state) { 1857 case SNDRV_PCM_STATE_XRUN: 1858 result = 0; /* already there */ 1859 break; 1860 case SNDRV_PCM_STATE_RUNNING: 1861 __snd_pcm_xrun(substream); 1862 result = 0; 1863 break; 1864 default: 1865 result = -EBADFD; 1866 } 1867 snd_pcm_stream_unlock_irq(substream); 1868 return result; 1869} 1870 1871/* 1872 * reset ioctl 1873 */ 1874/* reset callbacks: state argument ignored */ 1875static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, 1876 snd_pcm_state_t state) 1877{ 1878 struct snd_pcm_runtime *runtime = substream->runtime; 1879 switch (runtime->state) { 1880 case SNDRV_PCM_STATE_RUNNING: 1881 case SNDRV_PCM_STATE_PREPARED: 1882 case SNDRV_PCM_STATE_PAUSED: 1883 case SNDRV_PCM_STATE_SUSPENDED: 1884 return 0; 1885 default: 1886 return -EBADFD; 1887 } 1888} 1889 1890static int snd_pcm_do_reset(struct snd_pcm_substream *substream, 1891 snd_pcm_state_t state) 1892{ 1893 struct snd_pcm_runtime *runtime = substream->runtime; 1894 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1895 if (err < 0) 1896 return err; 1897 snd_pcm_stream_lock_irq(substream); 1898 runtime->hw_ptr_base = 0; 1899 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1900 runtime->status->hw_ptr % runtime->period_size; 1901 runtime->silence_start = runtime->status->hw_ptr; 1902 runtime->silence_filled = 0; 1903 snd_pcm_stream_unlock_irq(substream); 1904 return 0; 1905} 1906 1907static void snd_pcm_post_reset(struct snd_pcm_substream *substream, 1908 snd_pcm_state_t state) 1909{ 1910 struct snd_pcm_runtime *runtime = substream->runtime; 1911 snd_pcm_stream_lock_irq(substream); 1912 runtime->control->appl_ptr = runtime->status->hw_ptr; 1913 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1914 runtime->silence_size > 0) 1915 snd_pcm_playback_silence(substream, ULONG_MAX); 1916 snd_pcm_stream_unlock_irq(substream); 1917} 1918 1919static const struct action_ops snd_pcm_action_reset = { 1920 .pre_action = snd_pcm_pre_reset, 1921 .do_action = snd_pcm_do_reset, 1922 .post_action = snd_pcm_post_reset 1923}; 1924 1925static int snd_pcm_reset(struct snd_pcm_substream *substream) 1926{ 1927 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 1928 ACTION_ARG_IGNORE); 1929} 1930 1931/* 1932 * prepare ioctl 1933 */ 1934/* pass f_flags as state argument */ 1935static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1936 snd_pcm_state_t state) 1937{ 1938 struct snd_pcm_runtime *runtime = substream->runtime; 1939 int f_flags = (__force int)state; 1940 1941 if (runtime->state == SNDRV_PCM_STATE_OPEN || 1942 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 1943 return -EBADFD; 1944 if (snd_pcm_running(substream)) 1945 return -EBUSY; 1946 substream->f_flags = f_flags; 1947 return 0; 1948} 1949 1950static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, 1951 snd_pcm_state_t state) 1952{ 1953 int err; 1954 snd_pcm_sync_stop(substream, true); 1955 err = substream->ops->prepare(substream); 1956 if (err < 0) 1957 return err; 1958 return snd_pcm_do_reset(substream, state); 1959} 1960 1961static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, 1962 snd_pcm_state_t state) 1963{ 1964 struct snd_pcm_runtime *runtime = substream->runtime; 1965 runtime->control->appl_ptr = runtime->status->hw_ptr; 1966 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1967} 1968 1969static const struct action_ops snd_pcm_action_prepare = { 1970 .pre_action = snd_pcm_pre_prepare, 1971 .do_action = snd_pcm_do_prepare, 1972 .post_action = snd_pcm_post_prepare 1973}; 1974 1975/** 1976 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1977 * @substream: the PCM substream instance 1978 * @file: file to refer f_flags 1979 * 1980 * Return: Zero if successful, or a negative error code. 1981 */ 1982static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1983 struct file *file) 1984{ 1985 int f_flags; 1986 1987 if (file) 1988 f_flags = file->f_flags; 1989 else 1990 f_flags = substream->f_flags; 1991 1992 snd_pcm_stream_lock_irq(substream); 1993 switch (substream->runtime->state) { 1994 case SNDRV_PCM_STATE_PAUSED: 1995 snd_pcm_pause(substream, false); 1996 fallthrough; 1997 case SNDRV_PCM_STATE_SUSPENDED: 1998 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1999 break; 2000 } 2001 snd_pcm_stream_unlock_irq(substream); 2002 2003 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 2004 substream, 2005 (__force snd_pcm_state_t)f_flags); 2006} 2007 2008/* 2009 * drain ioctl 2010 */ 2011 2012/* drain init callbacks: state argument ignored */ 2013static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, 2014 snd_pcm_state_t state) 2015{ 2016 struct snd_pcm_runtime *runtime = substream->runtime; 2017 switch (runtime->state) { 2018 case SNDRV_PCM_STATE_OPEN: 2019 case SNDRV_PCM_STATE_DISCONNECTED: 2020 case SNDRV_PCM_STATE_SUSPENDED: 2021 return -EBADFD; 2022 } 2023 runtime->trigger_master = substream; 2024 return 0; 2025} 2026 2027static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, 2028 snd_pcm_state_t state) 2029{ 2030 struct snd_pcm_runtime *runtime = substream->runtime; 2031 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 2032 switch (runtime->state) { 2033 case SNDRV_PCM_STATE_PREPARED: 2034 /* start playback stream if possible */ 2035 if (! snd_pcm_playback_empty(substream)) { 2036 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 2037 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 2038 } else { 2039 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP); 2040 } 2041 break; 2042 case SNDRV_PCM_STATE_RUNNING: 2043 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING); 2044 break; 2045 case SNDRV_PCM_STATE_XRUN: 2046 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP); 2047 break; 2048 default: 2049 break; 2050 } 2051 } else { 2052 /* stop running stream */ 2053 if (runtime->state == SNDRV_PCM_STATE_RUNNING) { 2054 snd_pcm_state_t new_state; 2055 2056 new_state = snd_pcm_capture_avail(runtime) > 0 ? 2057 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 2058 snd_pcm_do_stop(substream, new_state); 2059 snd_pcm_post_stop(substream, new_state); 2060 } 2061 } 2062 2063 if (runtime->state == SNDRV_PCM_STATE_DRAINING && 2064 runtime->trigger_master == substream && 2065 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 2066 return substream->ops->trigger(substream, 2067 SNDRV_PCM_TRIGGER_DRAIN); 2068 2069 return 0; 2070} 2071 2072static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, 2073 snd_pcm_state_t state) 2074{ 2075} 2076 2077static const struct action_ops snd_pcm_action_drain_init = { 2078 .pre_action = snd_pcm_pre_drain_init, 2079 .do_action = snd_pcm_do_drain_init, 2080 .post_action = snd_pcm_post_drain_init 2081}; 2082 2083/* 2084 * Drain the stream(s). 2085 * When the substream is linked, sync until the draining of all playback streams 2086 * is finished. 2087 * After this call, all streams are supposed to be either SETUP or DRAINING 2088 * (capture only) state. 2089 */ 2090static int snd_pcm_drain(struct snd_pcm_substream *substream, 2091 struct file *file) 2092{ 2093 struct snd_card *card; 2094 struct snd_pcm_runtime *runtime; 2095 struct snd_pcm_substream *s; 2096 struct snd_pcm_group *group; 2097 wait_queue_entry_t wait; 2098 int result = 0; 2099 int nonblock = 0; 2100 2101 card = substream->pcm->card; 2102 runtime = substream->runtime; 2103 2104 if (runtime->state == SNDRV_PCM_STATE_OPEN) 2105 return -EBADFD; 2106 2107 if (file) { 2108 if (file->f_flags & O_NONBLOCK) 2109 nonblock = 1; 2110 } else if (substream->f_flags & O_NONBLOCK) 2111 nonblock = 1; 2112 2113 snd_pcm_stream_lock_irq(substream); 2114 /* resume pause */ 2115 if (runtime->state == SNDRV_PCM_STATE_PAUSED) 2116 snd_pcm_pause(substream, false); 2117 2118 /* pre-start/stop - all running streams are changed to DRAINING state */ 2119 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 2120 ACTION_ARG_IGNORE); 2121 if (result < 0) 2122 goto unlock; 2123 /* in non-blocking, we don't wait in ioctl but let caller poll */ 2124 if (nonblock) { 2125 result = -EAGAIN; 2126 goto unlock; 2127 } 2128 2129 for (;;) { 2130 long tout; 2131 struct snd_pcm_runtime *to_check; 2132 if (signal_pending(current)) { 2133 result = -ERESTARTSYS; 2134 break; 2135 } 2136 /* find a substream to drain */ 2137 to_check = NULL; 2138 group = snd_pcm_stream_group_ref(substream); 2139 snd_pcm_group_for_each_entry(s, substream) { 2140 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 2141 continue; 2142 runtime = s->runtime; 2143 if (runtime->state == SNDRV_PCM_STATE_DRAINING) { 2144 to_check = runtime; 2145 break; 2146 } 2147 } 2148 snd_pcm_group_unref(group, substream); 2149 if (!to_check) 2150 break; /* all drained */ 2151 init_waitqueue_entry(&wait, current); 2152 set_current_state(TASK_INTERRUPTIBLE); 2153 add_wait_queue(&to_check->sleep, &wait); 2154 snd_pcm_stream_unlock_irq(substream); 2155 if (runtime->no_period_wakeup) 2156 tout = MAX_SCHEDULE_TIMEOUT; 2157 else { 2158 tout = 100; 2159 if (runtime->rate) { 2160 long t = runtime->buffer_size * 1100 / runtime->rate; 2161 tout = max(t, tout); 2162 } 2163 tout = msecs_to_jiffies(tout); 2164 } 2165 tout = schedule_timeout(tout); 2166 2167 snd_pcm_stream_lock_irq(substream); 2168 group = snd_pcm_stream_group_ref(substream); 2169 snd_pcm_group_for_each_entry(s, substream) { 2170 if (s->runtime == to_check) { 2171 remove_wait_queue(&to_check->sleep, &wait); 2172 break; 2173 } 2174 } 2175 snd_pcm_group_unref(group, substream); 2176 2177 if (card->shutdown) { 2178 result = -ENODEV; 2179 break; 2180 } 2181 if (tout == 0) { 2182 if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED) 2183 result = -ESTRPIPE; 2184 else { 2185 dev_dbg(substream->pcm->card->dev, 2186 "playback drain timeout (DMA or IRQ trouble?)\n"); 2187 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2188 result = -EIO; 2189 } 2190 break; 2191 } 2192 } 2193 2194 unlock: 2195 snd_pcm_stream_unlock_irq(substream); 2196 2197 return result; 2198} 2199 2200/* 2201 * drop ioctl 2202 * 2203 * Immediately put all linked substreams into SETUP state. 2204 */ 2205static int snd_pcm_drop(struct snd_pcm_substream *substream) 2206{ 2207 struct snd_pcm_runtime *runtime; 2208 int result = 0; 2209 2210 if (PCM_RUNTIME_CHECK(substream)) 2211 return -ENXIO; 2212 runtime = substream->runtime; 2213 2214 if (runtime->state == SNDRV_PCM_STATE_OPEN || 2215 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 2216 return -EBADFD; 2217 2218 snd_pcm_stream_lock_irq(substream); 2219 /* resume pause */ 2220 if (runtime->state == SNDRV_PCM_STATE_PAUSED) 2221 snd_pcm_pause(substream, false); 2222 2223 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2224 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 2225 snd_pcm_stream_unlock_irq(substream); 2226 2227 return result; 2228} 2229 2230 2231static bool is_pcm_file(struct file *file) 2232{ 2233 struct inode *inode = file_inode(file); 2234 struct snd_pcm *pcm; 2235 unsigned int minor; 2236 2237 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2238 return false; 2239 minor = iminor(inode); 2240 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2241 if (!pcm) 2242 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2243 if (!pcm) 2244 return false; 2245 snd_card_unref(pcm->card); 2246 return true; 2247} 2248 2249/* 2250 * PCM link handling 2251 */ 2252static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2253{ 2254 int res = 0; 2255 struct snd_pcm_file *pcm_file; 2256 struct snd_pcm_substream *substream1; 2257 struct snd_pcm_group *group, *target_group; 2258 bool nonatomic = substream->pcm->nonatomic; 2259 struct fd f = fdget(fd); 2260 2261 if (!f.file) 2262 return -EBADFD; 2263 if (!is_pcm_file(f.file)) { 2264 res = -EBADFD; 2265 goto _badf; 2266 } 2267 pcm_file = f.file->private_data; 2268 substream1 = pcm_file->substream; 2269 2270 if (substream == substream1) { 2271 res = -EINVAL; 2272 goto _badf; 2273 } 2274 2275 group = kzalloc(sizeof(*group), GFP_KERNEL); 2276 if (!group) { 2277 res = -ENOMEM; 2278 goto _nolock; 2279 } 2280 snd_pcm_group_init(group); 2281 2282 down_write(&snd_pcm_link_rwsem); 2283 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN || 2284 substream->runtime->state != substream1->runtime->state || 2285 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2286 res = -EBADFD; 2287 goto _end; 2288 } 2289 if (snd_pcm_stream_linked(substream1)) { 2290 res = -EALREADY; 2291 goto _end; 2292 } 2293 2294 snd_pcm_stream_lock_irq(substream); 2295 if (!snd_pcm_stream_linked(substream)) { 2296 snd_pcm_group_assign(substream, group); 2297 group = NULL; /* assigned, don't free this one below */ 2298 } 2299 target_group = substream->group; 2300 snd_pcm_stream_unlock_irq(substream); 2301 2302 snd_pcm_group_lock_irq(target_group, nonatomic); 2303 snd_pcm_stream_lock_nested(substream1); 2304 snd_pcm_group_assign(substream1, target_group); 2305 refcount_inc(&target_group->refs); 2306 snd_pcm_stream_unlock(substream1); 2307 snd_pcm_group_unlock_irq(target_group, nonatomic); 2308 _end: 2309 up_write(&snd_pcm_link_rwsem); 2310 _nolock: 2311 kfree(group); 2312 _badf: 2313 fdput(f); 2314 return res; 2315} 2316 2317static void relink_to_local(struct snd_pcm_substream *substream) 2318{ 2319 snd_pcm_stream_lock_nested(substream); 2320 snd_pcm_group_assign(substream, &substream->self_group); 2321 snd_pcm_stream_unlock(substream); 2322} 2323 2324static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2325{ 2326 struct snd_pcm_group *group; 2327 bool nonatomic = substream->pcm->nonatomic; 2328 bool do_free = false; 2329 int res = 0; 2330 2331 down_write(&snd_pcm_link_rwsem); 2332 2333 if (!snd_pcm_stream_linked(substream)) { 2334 res = -EALREADY; 2335 goto _end; 2336 } 2337 2338 group = substream->group; 2339 snd_pcm_group_lock_irq(group, nonatomic); 2340 2341 relink_to_local(substream); 2342 refcount_dec(&group->refs); 2343 2344 /* detach the last stream, too */ 2345 if (list_is_singular(&group->substreams)) { 2346 relink_to_local(list_first_entry(&group->substreams, 2347 struct snd_pcm_substream, 2348 link_list)); 2349 do_free = refcount_dec_and_test(&group->refs); 2350 } 2351 2352 snd_pcm_group_unlock_irq(group, nonatomic); 2353 if (do_free) 2354 kfree(group); 2355 2356 _end: 2357 up_write(&snd_pcm_link_rwsem); 2358 return res; 2359} 2360 2361/* 2362 * hw configurator 2363 */ 2364static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2365 struct snd_pcm_hw_rule *rule) 2366{ 2367 struct snd_interval t; 2368 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2369 hw_param_interval_c(params, rule->deps[1]), &t); 2370 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2371} 2372 2373static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2374 struct snd_pcm_hw_rule *rule) 2375{ 2376 struct snd_interval t; 2377 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2378 hw_param_interval_c(params, rule->deps[1]), &t); 2379 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2380} 2381 2382static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2383 struct snd_pcm_hw_rule *rule) 2384{ 2385 struct snd_interval t; 2386 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2387 hw_param_interval_c(params, rule->deps[1]), 2388 (unsigned long) rule->private, &t); 2389 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2390} 2391 2392static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2393 struct snd_pcm_hw_rule *rule) 2394{ 2395 struct snd_interval t; 2396 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2397 (unsigned long) rule->private, 2398 hw_param_interval_c(params, rule->deps[1]), &t); 2399 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2400} 2401 2402static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2403 struct snd_pcm_hw_rule *rule) 2404{ 2405 snd_pcm_format_t k; 2406 const struct snd_interval *i = 2407 hw_param_interval_c(params, rule->deps[0]); 2408 struct snd_mask m; 2409 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2410 snd_mask_any(&m); 2411 pcm_for_each_format(k) { 2412 int bits; 2413 if (!snd_mask_test_format(mask, k)) 2414 continue; 2415 bits = snd_pcm_format_physical_width(k); 2416 if (bits <= 0) 2417 continue; /* ignore invalid formats */ 2418 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2419 snd_mask_reset(&m, (__force unsigned)k); 2420 } 2421 return snd_mask_refine(mask, &m); 2422} 2423 2424static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2425 struct snd_pcm_hw_rule *rule) 2426{ 2427 struct snd_interval t; 2428 snd_pcm_format_t k; 2429 2430 t.min = UINT_MAX; 2431 t.max = 0; 2432 t.openmin = 0; 2433 t.openmax = 0; 2434 pcm_for_each_format(k) { 2435 int bits; 2436 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2437 continue; 2438 bits = snd_pcm_format_physical_width(k); 2439 if (bits <= 0) 2440 continue; /* ignore invalid formats */ 2441 if (t.min > (unsigned)bits) 2442 t.min = bits; 2443 if (t.max < (unsigned)bits) 2444 t.max = bits; 2445 } 2446 t.integer = 1; 2447 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2448} 2449 2450#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2451#error "Change this table" 2452#endif 2453 2454static const unsigned int rates[] = { 2455 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2456 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2457}; 2458 2459const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2460 .count = ARRAY_SIZE(rates), 2461 .list = rates, 2462}; 2463 2464static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2465 struct snd_pcm_hw_rule *rule) 2466{ 2467 struct snd_pcm_hardware *hw = rule->private; 2468 return snd_interval_list(hw_param_interval(params, rule->var), 2469 snd_pcm_known_rates.count, 2470 snd_pcm_known_rates.list, hw->rates); 2471} 2472 2473static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2474 struct snd_pcm_hw_rule *rule) 2475{ 2476 struct snd_interval t; 2477 struct snd_pcm_substream *substream = rule->private; 2478 t.min = 0; 2479 t.max = substream->buffer_bytes_max; 2480 t.openmin = 0; 2481 t.openmax = 0; 2482 t.integer = 1; 2483 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2484} 2485 2486static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2487{ 2488 struct snd_pcm_runtime *runtime = substream->runtime; 2489 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2490 int k, err; 2491 2492 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2493 snd_mask_any(constrs_mask(constrs, k)); 2494 } 2495 2496 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2497 snd_interval_any(constrs_interval(constrs, k)); 2498 } 2499 2500 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2501 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2502 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2503 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2504 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2505 2506 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2507 snd_pcm_hw_rule_format, NULL, 2508 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2509 if (err < 0) 2510 return err; 2511 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2512 snd_pcm_hw_rule_sample_bits, NULL, 2513 SNDRV_PCM_HW_PARAM_FORMAT, 2514 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2515 if (err < 0) 2516 return err; 2517 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2518 snd_pcm_hw_rule_div, NULL, 2519 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2520 if (err < 0) 2521 return err; 2522 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2523 snd_pcm_hw_rule_mul, NULL, 2524 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2525 if (err < 0) 2526 return err; 2527 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2528 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2529 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2530 if (err < 0) 2531 return err; 2532 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2533 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2534 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2535 if (err < 0) 2536 return err; 2537 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2538 snd_pcm_hw_rule_div, NULL, 2539 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2540 if (err < 0) 2541 return err; 2542 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2543 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2544 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2545 if (err < 0) 2546 return err; 2547 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2548 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2549 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2550 if (err < 0) 2551 return err; 2552 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2553 snd_pcm_hw_rule_div, NULL, 2554 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2555 if (err < 0) 2556 return err; 2557 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2558 snd_pcm_hw_rule_div, NULL, 2559 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2560 if (err < 0) 2561 return err; 2562 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2563 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2564 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2565 if (err < 0) 2566 return err; 2567 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2568 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2569 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2570 if (err < 0) 2571 return err; 2572 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2573 snd_pcm_hw_rule_mul, NULL, 2574 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2575 if (err < 0) 2576 return err; 2577 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2578 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2579 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2580 if (err < 0) 2581 return err; 2582 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2583 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2584 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2585 if (err < 0) 2586 return err; 2587 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2588 snd_pcm_hw_rule_muldivk, (void*) 8, 2589 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2590 if (err < 0) 2591 return err; 2592 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2593 snd_pcm_hw_rule_muldivk, (void*) 8, 2594 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2595 if (err < 0) 2596 return err; 2597 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2598 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2599 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2600 if (err < 0) 2601 return err; 2602 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2603 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2604 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2605 if (err < 0) 2606 return err; 2607 return 0; 2608} 2609 2610static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2611{ 2612 struct snd_pcm_runtime *runtime = substream->runtime; 2613 struct snd_pcm_hardware *hw = &runtime->hw; 2614 int err; 2615 unsigned int mask = 0; 2616 2617 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2618 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED); 2619 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2620 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 2621 if (hw_support_mmap(substream)) { 2622 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2623 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED); 2624 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2625 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED); 2626 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2627 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX); 2628 } 2629 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2630 if (err < 0) 2631 return err; 2632 2633 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2634 if (err < 0) 2635 return err; 2636 2637 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 2638 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD)); 2639 if (err < 0) 2640 return err; 2641 2642 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2643 hw->channels_min, hw->channels_max); 2644 if (err < 0) 2645 return err; 2646 2647 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2648 hw->rate_min, hw->rate_max); 2649 if (err < 0) 2650 return err; 2651 2652 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2653 hw->period_bytes_min, hw->period_bytes_max); 2654 if (err < 0) 2655 return err; 2656 2657 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2658 hw->periods_min, hw->periods_max); 2659 if (err < 0) 2660 return err; 2661 2662 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2663 hw->period_bytes_min, hw->buffer_bytes_max); 2664 if (err < 0) 2665 return err; 2666 2667 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2668 snd_pcm_hw_rule_buffer_bytes_max, substream, 2669 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2670 if (err < 0) 2671 return err; 2672 2673 /* FIXME: remove */ 2674 if (runtime->dma_bytes) { 2675 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2676 if (err < 0) 2677 return err; 2678 } 2679 2680 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2681 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2682 snd_pcm_hw_rule_rate, hw, 2683 SNDRV_PCM_HW_PARAM_RATE, -1); 2684 if (err < 0) 2685 return err; 2686 } 2687 2688 /* FIXME: this belong to lowlevel */ 2689 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2690 2691 return 0; 2692} 2693 2694static void pcm_release_private(struct snd_pcm_substream *substream) 2695{ 2696 if (snd_pcm_stream_linked(substream)) 2697 snd_pcm_unlink(substream); 2698} 2699 2700void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2701{ 2702 substream->ref_count--; 2703 if (substream->ref_count > 0) 2704 return; 2705 2706 snd_pcm_drop(substream); 2707 if (substream->hw_opened) { 2708 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN) 2709 do_hw_free(substream); 2710 substream->ops->close(substream); 2711 substream->hw_opened = 0; 2712 } 2713 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 2714 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 2715 if (substream->pcm_release) { 2716 substream->pcm_release(substream); 2717 substream->pcm_release = NULL; 2718 } 2719 snd_pcm_detach_substream(substream); 2720} 2721EXPORT_SYMBOL(snd_pcm_release_substream); 2722 2723int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2724 struct file *file, 2725 struct snd_pcm_substream **rsubstream) 2726{ 2727 struct snd_pcm_substream *substream; 2728 int err; 2729 2730 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2731 if (err < 0) 2732 return err; 2733 if (substream->ref_count > 1) { 2734 *rsubstream = substream; 2735 return 0; 2736 } 2737 2738 err = snd_pcm_hw_constraints_init(substream); 2739 if (err < 0) { 2740 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2741 goto error; 2742 } 2743 2744 err = substream->ops->open(substream); 2745 if (err < 0) 2746 goto error; 2747 2748 substream->hw_opened = 1; 2749 2750 err = snd_pcm_hw_constraints_complete(substream); 2751 if (err < 0) { 2752 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2753 goto error; 2754 } 2755 2756 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever 2757 * the DMA buffer requires it 2758 */ 2759 if (substream->managed_buffer_alloc && 2760 substream->dma_buffer.dev.need_sync) 2761 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC; 2762 2763 *rsubstream = substream; 2764 return 0; 2765 2766 error: 2767 snd_pcm_release_substream(substream); 2768 return err; 2769} 2770EXPORT_SYMBOL(snd_pcm_open_substream); 2771 2772static int snd_pcm_open_file(struct file *file, 2773 struct snd_pcm *pcm, 2774 int stream) 2775{ 2776 struct snd_pcm_file *pcm_file; 2777 struct snd_pcm_substream *substream; 2778 int err; 2779 2780 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2781 if (err < 0) 2782 return err; 2783 2784 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2785 if (pcm_file == NULL) { 2786 snd_pcm_release_substream(substream); 2787 return -ENOMEM; 2788 } 2789 pcm_file->substream = substream; 2790 if (substream->ref_count == 1) 2791 substream->pcm_release = pcm_release_private; 2792 file->private_data = pcm_file; 2793 2794 return 0; 2795} 2796 2797static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2798{ 2799 struct snd_pcm *pcm; 2800 int err = nonseekable_open(inode, file); 2801 if (err < 0) 2802 return err; 2803 pcm = snd_lookup_minor_data(iminor(inode), 2804 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2805 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2806 if (pcm) 2807 snd_card_unref(pcm->card); 2808 return err; 2809} 2810 2811static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2812{ 2813 struct snd_pcm *pcm; 2814 int err = nonseekable_open(inode, file); 2815 if (err < 0) 2816 return err; 2817 pcm = snd_lookup_minor_data(iminor(inode), 2818 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2819 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2820 if (pcm) 2821 snd_card_unref(pcm->card); 2822 return err; 2823} 2824 2825static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2826{ 2827 int err; 2828 wait_queue_entry_t wait; 2829 2830 if (pcm == NULL) { 2831 err = -ENODEV; 2832 goto __error1; 2833 } 2834 err = snd_card_file_add(pcm->card, file); 2835 if (err < 0) 2836 goto __error1; 2837 if (!try_module_get(pcm->card->module)) { 2838 err = -EFAULT; 2839 goto __error2; 2840 } 2841 init_waitqueue_entry(&wait, current); 2842 add_wait_queue(&pcm->open_wait, &wait); 2843 mutex_lock(&pcm->open_mutex); 2844 while (1) { 2845 err = snd_pcm_open_file(file, pcm, stream); 2846 if (err >= 0) 2847 break; 2848 if (err == -EAGAIN) { 2849 if (file->f_flags & O_NONBLOCK) { 2850 err = -EBUSY; 2851 break; 2852 } 2853 } else 2854 break; 2855 set_current_state(TASK_INTERRUPTIBLE); 2856 mutex_unlock(&pcm->open_mutex); 2857 schedule(); 2858 mutex_lock(&pcm->open_mutex); 2859 if (pcm->card->shutdown) { 2860 err = -ENODEV; 2861 break; 2862 } 2863 if (signal_pending(current)) { 2864 err = -ERESTARTSYS; 2865 break; 2866 } 2867 } 2868 remove_wait_queue(&pcm->open_wait, &wait); 2869 mutex_unlock(&pcm->open_mutex); 2870 if (err < 0) 2871 goto __error; 2872 return err; 2873 2874 __error: 2875 module_put(pcm->card->module); 2876 __error2: 2877 snd_card_file_remove(pcm->card, file); 2878 __error1: 2879 return err; 2880} 2881 2882static int snd_pcm_release(struct inode *inode, struct file *file) 2883{ 2884 struct snd_pcm *pcm; 2885 struct snd_pcm_substream *substream; 2886 struct snd_pcm_file *pcm_file; 2887 2888 pcm_file = file->private_data; 2889 substream = pcm_file->substream; 2890 if (snd_BUG_ON(!substream)) 2891 return -ENXIO; 2892 pcm = substream->pcm; 2893 2894 /* block until the device gets woken up as it may touch the hardware */ 2895 snd_power_wait(pcm->card); 2896 2897 mutex_lock(&pcm->open_mutex); 2898 snd_pcm_release_substream(substream); 2899 kfree(pcm_file); 2900 mutex_unlock(&pcm->open_mutex); 2901 wake_up(&pcm->open_wait); 2902 module_put(pcm->card->module); 2903 snd_card_file_remove(pcm->card, file); 2904 return 0; 2905} 2906 2907/* check and update PCM state; return 0 or a negative error 2908 * call this inside PCM lock 2909 */ 2910static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2911{ 2912 switch (substream->runtime->state) { 2913 case SNDRV_PCM_STATE_DRAINING: 2914 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2915 return -EBADFD; 2916 fallthrough; 2917 case SNDRV_PCM_STATE_RUNNING: 2918 return snd_pcm_update_hw_ptr(substream); 2919 case SNDRV_PCM_STATE_PREPARED: 2920 case SNDRV_PCM_STATE_PAUSED: 2921 return 0; 2922 case SNDRV_PCM_STATE_SUSPENDED: 2923 return -ESTRPIPE; 2924 case SNDRV_PCM_STATE_XRUN: 2925 return -EPIPE; 2926 default: 2927 return -EBADFD; 2928 } 2929} 2930 2931/* increase the appl_ptr; returns the processed frames or a negative error */ 2932static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2933 snd_pcm_uframes_t frames, 2934 snd_pcm_sframes_t avail) 2935{ 2936 struct snd_pcm_runtime *runtime = substream->runtime; 2937 snd_pcm_sframes_t appl_ptr; 2938 int ret; 2939 2940 if (avail <= 0) 2941 return 0; 2942 if (frames > (snd_pcm_uframes_t)avail) 2943 frames = avail; 2944 appl_ptr = runtime->control->appl_ptr + frames; 2945 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2946 appl_ptr -= runtime->boundary; 2947 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2948 return ret < 0 ? ret : frames; 2949} 2950 2951/* decrease the appl_ptr; returns the processed frames or zero for error */ 2952static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2953 snd_pcm_uframes_t frames, 2954 snd_pcm_sframes_t avail) 2955{ 2956 struct snd_pcm_runtime *runtime = substream->runtime; 2957 snd_pcm_sframes_t appl_ptr; 2958 int ret; 2959 2960 if (avail <= 0) 2961 return 0; 2962 if (frames > (snd_pcm_uframes_t)avail) 2963 frames = avail; 2964 appl_ptr = runtime->control->appl_ptr - frames; 2965 if (appl_ptr < 0) 2966 appl_ptr += runtime->boundary; 2967 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2968 /* NOTE: we return zero for errors because PulseAudio gets depressed 2969 * upon receiving an error from rewind ioctl and stops processing 2970 * any longer. Returning zero means that no rewind is done, so 2971 * it's not absolutely wrong to answer like that. 2972 */ 2973 return ret < 0 ? 0 : frames; 2974} 2975 2976static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2977 snd_pcm_uframes_t frames) 2978{ 2979 snd_pcm_sframes_t ret; 2980 2981 if (frames == 0) 2982 return 0; 2983 2984 snd_pcm_stream_lock_irq(substream); 2985 ret = do_pcm_hwsync(substream); 2986 if (!ret) 2987 ret = rewind_appl_ptr(substream, frames, 2988 snd_pcm_hw_avail(substream)); 2989 snd_pcm_stream_unlock_irq(substream); 2990 if (ret >= 0) 2991 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 2992 return ret; 2993} 2994 2995static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2996 snd_pcm_uframes_t frames) 2997{ 2998 snd_pcm_sframes_t ret; 2999 3000 if (frames == 0) 3001 return 0; 3002 3003 snd_pcm_stream_lock_irq(substream); 3004 ret = do_pcm_hwsync(substream); 3005 if (!ret) 3006 ret = forward_appl_ptr(substream, frames, 3007 snd_pcm_avail(substream)); 3008 snd_pcm_stream_unlock_irq(substream); 3009 if (ret >= 0) 3010 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3011 return ret; 3012} 3013 3014static int snd_pcm_delay(struct snd_pcm_substream *substream, 3015 snd_pcm_sframes_t *delay) 3016{ 3017 int err; 3018 3019 snd_pcm_stream_lock_irq(substream); 3020 err = do_pcm_hwsync(substream); 3021 if (delay && !err) 3022 *delay = snd_pcm_calc_delay(substream); 3023 snd_pcm_stream_unlock_irq(substream); 3024 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU); 3025 3026 return err; 3027} 3028 3029static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream) 3030{ 3031 return snd_pcm_delay(substream, NULL); 3032} 3033 3034static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 3035 struct snd_pcm_sync_ptr __user *_sync_ptr) 3036{ 3037 struct snd_pcm_runtime *runtime = substream->runtime; 3038 struct snd_pcm_sync_ptr sync_ptr; 3039 volatile struct snd_pcm_mmap_status *status; 3040 volatile struct snd_pcm_mmap_control *control; 3041 int err; 3042 3043 memset(&sync_ptr, 0, sizeof(sync_ptr)); 3044 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 3045 return -EFAULT; 3046 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 3047 return -EFAULT; 3048 status = runtime->status; 3049 control = runtime->control; 3050 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3051 err = snd_pcm_hwsync(substream); 3052 if (err < 0) 3053 return err; 3054 } 3055 snd_pcm_stream_lock_irq(substream); 3056 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 3057 err = pcm_lib_apply_appl_ptr(substream, 3058 sync_ptr.c.control.appl_ptr); 3059 if (err < 0) { 3060 snd_pcm_stream_unlock_irq(substream); 3061 return err; 3062 } 3063 } else { 3064 sync_ptr.c.control.appl_ptr = control->appl_ptr; 3065 } 3066 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3067 control->avail_min = sync_ptr.c.control.avail_min; 3068 else 3069 sync_ptr.c.control.avail_min = control->avail_min; 3070 sync_ptr.s.status.state = status->state; 3071 sync_ptr.s.status.hw_ptr = status->hw_ptr; 3072 sync_ptr.s.status.tstamp = status->tstamp; 3073 sync_ptr.s.status.suspended_state = status->suspended_state; 3074 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 3075 snd_pcm_stream_unlock_irq(substream); 3076 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 3077 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3078 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 3079 return -EFAULT; 3080 return 0; 3081} 3082 3083struct snd_pcm_mmap_status32 { 3084 snd_pcm_state_t state; 3085 s32 pad1; 3086 u32 hw_ptr; 3087 s32 tstamp_sec; 3088 s32 tstamp_nsec; 3089 snd_pcm_state_t suspended_state; 3090 s32 audio_tstamp_sec; 3091 s32 audio_tstamp_nsec; 3092} __attribute__((packed)); 3093 3094struct snd_pcm_mmap_control32 { 3095 u32 appl_ptr; 3096 u32 avail_min; 3097}; 3098 3099struct snd_pcm_sync_ptr32 { 3100 u32 flags; 3101 union { 3102 struct snd_pcm_mmap_status32 status; 3103 unsigned char reserved[64]; 3104 } s; 3105 union { 3106 struct snd_pcm_mmap_control32 control; 3107 unsigned char reserved[64]; 3108 } c; 3109} __attribute__((packed)); 3110 3111/* recalcuate the boundary within 32bit */ 3112static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime) 3113{ 3114 snd_pcm_uframes_t boundary; 3115 3116 if (! runtime->buffer_size) 3117 return 0; 3118 boundary = runtime->buffer_size; 3119 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size) 3120 boundary *= 2; 3121 return boundary; 3122} 3123 3124static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, 3125 struct snd_pcm_sync_ptr32 __user *src) 3126{ 3127 struct snd_pcm_runtime *runtime = substream->runtime; 3128 volatile struct snd_pcm_mmap_status *status; 3129 volatile struct snd_pcm_mmap_control *control; 3130 u32 sflags; 3131 struct snd_pcm_mmap_control scontrol; 3132 struct snd_pcm_mmap_status sstatus; 3133 snd_pcm_uframes_t boundary; 3134 int err; 3135 3136 if (snd_BUG_ON(!runtime)) 3137 return -EINVAL; 3138 3139 if (get_user(sflags, &src->flags) || 3140 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3141 get_user(scontrol.avail_min, &src->c.control.avail_min)) 3142 return -EFAULT; 3143 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3144 err = snd_pcm_hwsync(substream); 3145 if (err < 0) 3146 return err; 3147 } 3148 status = runtime->status; 3149 control = runtime->control; 3150 boundary = recalculate_boundary(runtime); 3151 if (! boundary) 3152 boundary = 0x7fffffff; 3153 snd_pcm_stream_lock_irq(substream); 3154 /* FIXME: we should consider the boundary for the sync from app */ 3155 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) { 3156 err = pcm_lib_apply_appl_ptr(substream, 3157 scontrol.appl_ptr); 3158 if (err < 0) { 3159 snd_pcm_stream_unlock_irq(substream); 3160 return err; 3161 } 3162 } else 3163 scontrol.appl_ptr = control->appl_ptr % boundary; 3164 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3165 control->avail_min = scontrol.avail_min; 3166 else 3167 scontrol.avail_min = control->avail_min; 3168 sstatus.state = status->state; 3169 sstatus.hw_ptr = status->hw_ptr % boundary; 3170 sstatus.tstamp = status->tstamp; 3171 sstatus.suspended_state = status->suspended_state; 3172 sstatus.audio_tstamp = status->audio_tstamp; 3173 snd_pcm_stream_unlock_irq(substream); 3174 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 3175 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3176 if (put_user(sstatus.state, &src->s.status.state) || 3177 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || 3178 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) || 3179 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) || 3180 put_user(sstatus.suspended_state, &src->s.status.suspended_state) || 3181 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) || 3182 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) || 3183 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3184 put_user(scontrol.avail_min, &src->c.control.avail_min)) 3185 return -EFAULT; 3186 3187 return 0; 3188} 3189#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32) 3190 3191static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 3192{ 3193 struct snd_pcm_runtime *runtime = substream->runtime; 3194 int arg; 3195 3196 if (get_user(arg, _arg)) 3197 return -EFAULT; 3198 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 3199 return -EINVAL; 3200 runtime->tstamp_type = arg; 3201 return 0; 3202} 3203 3204static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 3205 struct snd_xferi __user *_xferi) 3206{ 3207 struct snd_xferi xferi; 3208 struct snd_pcm_runtime *runtime = substream->runtime; 3209 snd_pcm_sframes_t result; 3210 3211 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3212 return -EBADFD; 3213 if (put_user(0, &_xferi->result)) 3214 return -EFAULT; 3215 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 3216 return -EFAULT; 3217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3218 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 3219 else 3220 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 3221 if (put_user(result, &_xferi->result)) 3222 return -EFAULT; 3223 return result < 0 ? result : 0; 3224} 3225 3226static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 3227 struct snd_xfern __user *_xfern) 3228{ 3229 struct snd_xfern xfern; 3230 struct snd_pcm_runtime *runtime = substream->runtime; 3231 void *bufs; 3232 snd_pcm_sframes_t result; 3233 3234 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3235 return -EBADFD; 3236 if (runtime->channels > 128) 3237 return -EINVAL; 3238 if (put_user(0, &_xfern->result)) 3239 return -EFAULT; 3240 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 3241 return -EFAULT; 3242 3243 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 3244 if (IS_ERR(bufs)) 3245 return PTR_ERR(bufs); 3246 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3247 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 3248 else 3249 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 3250 kfree(bufs); 3251 if (put_user(result, &_xfern->result)) 3252 return -EFAULT; 3253 return result < 0 ? result : 0; 3254} 3255 3256static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 3257 snd_pcm_uframes_t __user *_frames) 3258{ 3259 snd_pcm_uframes_t frames; 3260 snd_pcm_sframes_t result; 3261 3262 if (get_user(frames, _frames)) 3263 return -EFAULT; 3264 if (put_user(0, _frames)) 3265 return -EFAULT; 3266 result = snd_pcm_rewind(substream, frames); 3267 if (put_user(result, _frames)) 3268 return -EFAULT; 3269 return result < 0 ? result : 0; 3270} 3271 3272static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 3273 snd_pcm_uframes_t __user *_frames) 3274{ 3275 snd_pcm_uframes_t frames; 3276 snd_pcm_sframes_t result; 3277 3278 if (get_user(frames, _frames)) 3279 return -EFAULT; 3280 if (put_user(0, _frames)) 3281 return -EFAULT; 3282 result = snd_pcm_forward(substream, frames); 3283 if (put_user(result, _frames)) 3284 return -EFAULT; 3285 return result < 0 ? result : 0; 3286} 3287 3288static int snd_pcm_common_ioctl(struct file *file, 3289 struct snd_pcm_substream *substream, 3290 unsigned int cmd, void __user *arg) 3291{ 3292 struct snd_pcm_file *pcm_file = file->private_data; 3293 int res; 3294 3295 if (PCM_RUNTIME_CHECK(substream)) 3296 return -ENXIO; 3297 3298 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3299 return -EBADFD; 3300 3301 res = snd_power_wait(substream->pcm->card); 3302 if (res < 0) 3303 return res; 3304 3305 switch (cmd) { 3306 case SNDRV_PCM_IOCTL_PVERSION: 3307 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 3308 case SNDRV_PCM_IOCTL_INFO: 3309 return snd_pcm_info_user(substream, arg); 3310 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 3311 return 0; 3312 case SNDRV_PCM_IOCTL_TTSTAMP: 3313 return snd_pcm_tstamp(substream, arg); 3314 case SNDRV_PCM_IOCTL_USER_PVERSION: 3315 if (get_user(pcm_file->user_pversion, 3316 (unsigned int __user *)arg)) 3317 return -EFAULT; 3318 return 0; 3319 case SNDRV_PCM_IOCTL_HW_REFINE: 3320 return snd_pcm_hw_refine_user(substream, arg); 3321 case SNDRV_PCM_IOCTL_HW_PARAMS: 3322 return snd_pcm_hw_params_user(substream, arg); 3323 case SNDRV_PCM_IOCTL_HW_FREE: 3324 return snd_pcm_hw_free(substream); 3325 case SNDRV_PCM_IOCTL_SW_PARAMS: 3326 return snd_pcm_sw_params_user(substream, arg); 3327 case SNDRV_PCM_IOCTL_STATUS32: 3328 return snd_pcm_status_user32(substream, arg, false); 3329 case SNDRV_PCM_IOCTL_STATUS_EXT32: 3330 return snd_pcm_status_user32(substream, arg, true); 3331 case SNDRV_PCM_IOCTL_STATUS64: 3332 return snd_pcm_status_user64(substream, arg, false); 3333 case SNDRV_PCM_IOCTL_STATUS_EXT64: 3334 return snd_pcm_status_user64(substream, arg, true); 3335 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 3336 return snd_pcm_channel_info_user(substream, arg); 3337 case SNDRV_PCM_IOCTL_PREPARE: 3338 return snd_pcm_prepare(substream, file); 3339 case SNDRV_PCM_IOCTL_RESET: 3340 return snd_pcm_reset(substream); 3341 case SNDRV_PCM_IOCTL_START: 3342 return snd_pcm_start_lock_irq(substream); 3343 case SNDRV_PCM_IOCTL_LINK: 3344 return snd_pcm_link(substream, (int)(unsigned long) arg); 3345 case SNDRV_PCM_IOCTL_UNLINK: 3346 return snd_pcm_unlink(substream); 3347 case SNDRV_PCM_IOCTL_RESUME: 3348 return snd_pcm_resume(substream); 3349 case SNDRV_PCM_IOCTL_XRUN: 3350 return snd_pcm_xrun(substream); 3351 case SNDRV_PCM_IOCTL_HWSYNC: 3352 return snd_pcm_hwsync(substream); 3353 case SNDRV_PCM_IOCTL_DELAY: 3354 { 3355 snd_pcm_sframes_t delay = 0; 3356 snd_pcm_sframes_t __user *res = arg; 3357 int err; 3358 3359 err = snd_pcm_delay(substream, &delay); 3360 if (err) 3361 return err; 3362 if (put_user(delay, res)) 3363 return -EFAULT; 3364 return 0; 3365 } 3366 case __SNDRV_PCM_IOCTL_SYNC_PTR32: 3367 return snd_pcm_ioctl_sync_ptr_compat(substream, arg); 3368 case __SNDRV_PCM_IOCTL_SYNC_PTR64: 3369 return snd_pcm_sync_ptr(substream, arg); 3370#ifdef CONFIG_SND_SUPPORT_OLD_API 3371 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 3372 return snd_pcm_hw_refine_old_user(substream, arg); 3373 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 3374 return snd_pcm_hw_params_old_user(substream, arg); 3375#endif 3376 case SNDRV_PCM_IOCTL_DRAIN: 3377 return snd_pcm_drain(substream, file); 3378 case SNDRV_PCM_IOCTL_DROP: 3379 return snd_pcm_drop(substream); 3380 case SNDRV_PCM_IOCTL_PAUSE: 3381 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg); 3382 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3383 case SNDRV_PCM_IOCTL_READI_FRAMES: 3384 return snd_pcm_xferi_frames_ioctl(substream, arg); 3385 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3386 case SNDRV_PCM_IOCTL_READN_FRAMES: 3387 return snd_pcm_xfern_frames_ioctl(substream, arg); 3388 case SNDRV_PCM_IOCTL_REWIND: 3389 return snd_pcm_rewind_ioctl(substream, arg); 3390 case SNDRV_PCM_IOCTL_FORWARD: 3391 return snd_pcm_forward_ioctl(substream, arg); 3392 } 3393 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3394 return -ENOTTY; 3395} 3396 3397static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3398 unsigned long arg) 3399{ 3400 struct snd_pcm_file *pcm_file; 3401 3402 pcm_file = file->private_data; 3403 3404 if (((cmd >> 8) & 0xff) != 'A') 3405 return -ENOTTY; 3406 3407 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3408 (void __user *)arg); 3409} 3410 3411/** 3412 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3413 * @substream: PCM substream 3414 * @cmd: IOCTL cmd 3415 * @arg: IOCTL argument 3416 * 3417 * The function is provided primarily for OSS layer and USB gadget drivers, 3418 * and it allows only the limited set of ioctls (hw_params, sw_params, 3419 * prepare, start, drain, drop, forward). 3420 * 3421 * Return: zero if successful, or a negative error code 3422 */ 3423int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3424 unsigned int cmd, void *arg) 3425{ 3426 snd_pcm_uframes_t *frames = arg; 3427 snd_pcm_sframes_t result; 3428 3429 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3430 return -EBADFD; 3431 3432 switch (cmd) { 3433 case SNDRV_PCM_IOCTL_FORWARD: 3434 { 3435 /* provided only for OSS; capture-only and no value returned */ 3436 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3437 return -EINVAL; 3438 result = snd_pcm_forward(substream, *frames); 3439 return result < 0 ? result : 0; 3440 } 3441 case SNDRV_PCM_IOCTL_HW_PARAMS: 3442 return snd_pcm_hw_params(substream, arg); 3443 case SNDRV_PCM_IOCTL_SW_PARAMS: 3444 return snd_pcm_sw_params(substream, arg); 3445 case SNDRV_PCM_IOCTL_PREPARE: 3446 return snd_pcm_prepare(substream, NULL); 3447 case SNDRV_PCM_IOCTL_START: 3448 return snd_pcm_start_lock_irq(substream); 3449 case SNDRV_PCM_IOCTL_DRAIN: 3450 return snd_pcm_drain(substream, NULL); 3451 case SNDRV_PCM_IOCTL_DROP: 3452 return snd_pcm_drop(substream); 3453 case SNDRV_PCM_IOCTL_DELAY: 3454 return snd_pcm_delay(substream, frames); 3455 default: 3456 return -EINVAL; 3457 } 3458} 3459EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3460 3461static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3462 loff_t * offset) 3463{ 3464 struct snd_pcm_file *pcm_file; 3465 struct snd_pcm_substream *substream; 3466 struct snd_pcm_runtime *runtime; 3467 snd_pcm_sframes_t result; 3468 3469 pcm_file = file->private_data; 3470 substream = pcm_file->substream; 3471 if (PCM_RUNTIME_CHECK(substream)) 3472 return -ENXIO; 3473 runtime = substream->runtime; 3474 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3475 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3476 return -EBADFD; 3477 if (!frame_aligned(runtime, count)) 3478 return -EINVAL; 3479 count = bytes_to_frames(runtime, count); 3480 result = snd_pcm_lib_read(substream, buf, count); 3481 if (result > 0) 3482 result = frames_to_bytes(runtime, result); 3483 return result; 3484} 3485 3486static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3487 size_t count, loff_t * offset) 3488{ 3489 struct snd_pcm_file *pcm_file; 3490 struct snd_pcm_substream *substream; 3491 struct snd_pcm_runtime *runtime; 3492 snd_pcm_sframes_t result; 3493 3494 pcm_file = file->private_data; 3495 substream = pcm_file->substream; 3496 if (PCM_RUNTIME_CHECK(substream)) 3497 return -ENXIO; 3498 runtime = substream->runtime; 3499 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3500 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3501 return -EBADFD; 3502 if (!frame_aligned(runtime, count)) 3503 return -EINVAL; 3504 count = bytes_to_frames(runtime, count); 3505 result = snd_pcm_lib_write(substream, buf, count); 3506 if (result > 0) 3507 result = frames_to_bytes(runtime, result); 3508 return result; 3509} 3510 3511static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3512{ 3513 struct snd_pcm_file *pcm_file; 3514 struct snd_pcm_substream *substream; 3515 struct snd_pcm_runtime *runtime; 3516 snd_pcm_sframes_t result; 3517 unsigned long i; 3518 void __user **bufs; 3519 snd_pcm_uframes_t frames; 3520 const struct iovec *iov = iter_iov(to); 3521 3522 pcm_file = iocb->ki_filp->private_data; 3523 substream = pcm_file->substream; 3524 if (PCM_RUNTIME_CHECK(substream)) 3525 return -ENXIO; 3526 runtime = substream->runtime; 3527 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3528 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3529 return -EBADFD; 3530 if (!to->user_backed) 3531 return -EINVAL; 3532 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3533 return -EINVAL; 3534 if (!frame_aligned(runtime, iov->iov_len)) 3535 return -EINVAL; 3536 frames = bytes_to_samples(runtime, iov->iov_len); 3537 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3538 if (bufs == NULL) 3539 return -ENOMEM; 3540 for (i = 0; i < to->nr_segs; ++i) { 3541 bufs[i] = iov->iov_base; 3542 iov++; 3543 } 3544 result = snd_pcm_lib_readv(substream, bufs, frames); 3545 if (result > 0) 3546 result = frames_to_bytes(runtime, result); 3547 kfree(bufs); 3548 return result; 3549} 3550 3551static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3552{ 3553 struct snd_pcm_file *pcm_file; 3554 struct snd_pcm_substream *substream; 3555 struct snd_pcm_runtime *runtime; 3556 snd_pcm_sframes_t result; 3557 unsigned long i; 3558 void __user **bufs; 3559 snd_pcm_uframes_t frames; 3560 const struct iovec *iov = iter_iov(from); 3561 3562 pcm_file = iocb->ki_filp->private_data; 3563 substream = pcm_file->substream; 3564 if (PCM_RUNTIME_CHECK(substream)) 3565 return -ENXIO; 3566 runtime = substream->runtime; 3567 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3568 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3569 return -EBADFD; 3570 if (!from->user_backed) 3571 return -EINVAL; 3572 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3573 !frame_aligned(runtime, iov->iov_len)) 3574 return -EINVAL; 3575 frames = bytes_to_samples(runtime, iov->iov_len); 3576 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3577 if (bufs == NULL) 3578 return -ENOMEM; 3579 for (i = 0; i < from->nr_segs; ++i) { 3580 bufs[i] = iov->iov_base; 3581 iov++; 3582 } 3583 result = snd_pcm_lib_writev(substream, bufs, frames); 3584 if (result > 0) 3585 result = frames_to_bytes(runtime, result); 3586 kfree(bufs); 3587 return result; 3588} 3589 3590static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3591{ 3592 struct snd_pcm_file *pcm_file; 3593 struct snd_pcm_substream *substream; 3594 struct snd_pcm_runtime *runtime; 3595 __poll_t mask, ok; 3596 snd_pcm_uframes_t avail; 3597 3598 pcm_file = file->private_data; 3599 3600 substream = pcm_file->substream; 3601 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3602 ok = EPOLLOUT | EPOLLWRNORM; 3603 else 3604 ok = EPOLLIN | EPOLLRDNORM; 3605 if (PCM_RUNTIME_CHECK(substream)) 3606 return ok | EPOLLERR; 3607 3608 runtime = substream->runtime; 3609 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3610 return ok | EPOLLERR; 3611 3612 poll_wait(file, &runtime->sleep, wait); 3613 3614 mask = 0; 3615 snd_pcm_stream_lock_irq(substream); 3616 avail = snd_pcm_avail(substream); 3617 switch (runtime->state) { 3618 case SNDRV_PCM_STATE_RUNNING: 3619 case SNDRV_PCM_STATE_PREPARED: 3620 case SNDRV_PCM_STATE_PAUSED: 3621 if (avail >= runtime->control->avail_min) 3622 mask = ok; 3623 break; 3624 case SNDRV_PCM_STATE_DRAINING: 3625 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3626 mask = ok; 3627 if (!avail) 3628 mask |= EPOLLERR; 3629 } 3630 break; 3631 default: 3632 mask = ok | EPOLLERR; 3633 break; 3634 } 3635 snd_pcm_stream_unlock_irq(substream); 3636 return mask; 3637} 3638 3639/* 3640 * mmap support 3641 */ 3642 3643/* 3644 * Only on coherent architectures, we can mmap the status and the control records 3645 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3646 */ 3647#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3648/* 3649 * mmap status record 3650 */ 3651static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3652{ 3653 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3654 struct snd_pcm_runtime *runtime; 3655 3656 if (substream == NULL) 3657 return VM_FAULT_SIGBUS; 3658 runtime = substream->runtime; 3659 vmf->page = virt_to_page(runtime->status); 3660 get_page(vmf->page); 3661 return 0; 3662} 3663 3664static const struct vm_operations_struct snd_pcm_vm_ops_status = 3665{ 3666 .fault = snd_pcm_mmap_status_fault, 3667}; 3668 3669static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3670 struct vm_area_struct *area) 3671{ 3672 long size; 3673 if (!(area->vm_flags & VM_READ)) 3674 return -EINVAL; 3675 size = area->vm_end - area->vm_start; 3676 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3677 return -EINVAL; 3678 area->vm_ops = &snd_pcm_vm_ops_status; 3679 area->vm_private_data = substream; 3680 vm_flags_mod(area, VM_DONTEXPAND | VM_DONTDUMP, 3681 VM_WRITE | VM_MAYWRITE); 3682 3683 return 0; 3684} 3685 3686/* 3687 * mmap control record 3688 */ 3689static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3690{ 3691 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3692 struct snd_pcm_runtime *runtime; 3693 3694 if (substream == NULL) 3695 return VM_FAULT_SIGBUS; 3696 runtime = substream->runtime; 3697 vmf->page = virt_to_page(runtime->control); 3698 get_page(vmf->page); 3699 return 0; 3700} 3701 3702static const struct vm_operations_struct snd_pcm_vm_ops_control = 3703{ 3704 .fault = snd_pcm_mmap_control_fault, 3705}; 3706 3707static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3708 struct vm_area_struct *area) 3709{ 3710 long size; 3711 if (!(area->vm_flags & VM_READ)) 3712 return -EINVAL; 3713 size = area->vm_end - area->vm_start; 3714 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3715 return -EINVAL; 3716 area->vm_ops = &snd_pcm_vm_ops_control; 3717 area->vm_private_data = substream; 3718 vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP); 3719 return 0; 3720} 3721 3722static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3723{ 3724 /* If drivers require the explicit sync (typically for non-coherent 3725 * pages), we have to disable the mmap of status and control data 3726 * to enforce the control via SYNC_PTR ioctl. 3727 */ 3728 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC) 3729 return false; 3730 /* See pcm_control_mmap_allowed() below. 3731 * Since older alsa-lib requires both status and control mmaps to be 3732 * coupled, we have to disable the status mmap for old alsa-lib, too. 3733 */ 3734 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3735 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3736 return false; 3737 return true; 3738} 3739 3740static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3741{ 3742 if (pcm_file->no_compat_mmap) 3743 return false; 3744 /* see above */ 3745 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC) 3746 return false; 3747 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3748 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3749 * thus it effectively assures the manual update of appl_ptr. 3750 */ 3751 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3752 return false; 3753 return true; 3754} 3755 3756#else /* ! coherent mmap */ 3757/* 3758 * don't support mmap for status and control records. 3759 */ 3760#define pcm_status_mmap_allowed(pcm_file) false 3761#define pcm_control_mmap_allowed(pcm_file) false 3762 3763static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3764 struct vm_area_struct *area) 3765{ 3766 return -ENXIO; 3767} 3768static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3769 struct vm_area_struct *area) 3770{ 3771 return -ENXIO; 3772} 3773#endif /* coherent mmap */ 3774 3775/* 3776 * fault callback for mmapping a RAM page 3777 */ 3778static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3779{ 3780 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3781 struct snd_pcm_runtime *runtime; 3782 unsigned long offset; 3783 struct page * page; 3784 size_t dma_bytes; 3785 3786 if (substream == NULL) 3787 return VM_FAULT_SIGBUS; 3788 runtime = substream->runtime; 3789 offset = vmf->pgoff << PAGE_SHIFT; 3790 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3791 if (offset > dma_bytes - PAGE_SIZE) 3792 return VM_FAULT_SIGBUS; 3793 if (substream->ops->page) 3794 page = substream->ops->page(substream, offset); 3795 else if (!snd_pcm_get_dma_buf(substream)) 3796 page = virt_to_page(runtime->dma_area + offset); 3797 else 3798 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset); 3799 if (!page) 3800 return VM_FAULT_SIGBUS; 3801 get_page(page); 3802 vmf->page = page; 3803 return 0; 3804} 3805 3806static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3807 .open = snd_pcm_mmap_data_open, 3808 .close = snd_pcm_mmap_data_close, 3809}; 3810 3811static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3812 .open = snd_pcm_mmap_data_open, 3813 .close = snd_pcm_mmap_data_close, 3814 .fault = snd_pcm_mmap_data_fault, 3815}; 3816 3817/* 3818 * mmap the DMA buffer on RAM 3819 */ 3820 3821/** 3822 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3823 * @substream: PCM substream 3824 * @area: VMA 3825 * 3826 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3827 * this function is invoked implicitly. 3828 * 3829 * Return: zero if successful, or a negative error code 3830 */ 3831int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3832 struct vm_area_struct *area) 3833{ 3834 vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP); 3835 if (!substream->ops->page && 3836 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area)) 3837 return 0; 3838 /* mmap with fault handler */ 3839 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3840 return 0; 3841} 3842EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3843 3844/* 3845 * mmap the DMA buffer on I/O memory area 3846 */ 3847#if SNDRV_PCM_INFO_MMAP_IOMEM 3848/** 3849 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3850 * @substream: PCM substream 3851 * @area: VMA 3852 * 3853 * When your hardware uses the iomapped pages as the hardware buffer and 3854 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3855 * is supposed to work only on limited architectures. 3856 * 3857 * Return: zero if successful, or a negative error code 3858 */ 3859int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3860 struct vm_area_struct *area) 3861{ 3862 struct snd_pcm_runtime *runtime = substream->runtime; 3863 3864 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3865 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3866} 3867EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3868#endif /* SNDRV_PCM_INFO_MMAP */ 3869 3870/* 3871 * mmap DMA buffer 3872 */ 3873int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3874 struct vm_area_struct *area) 3875{ 3876 struct snd_pcm_runtime *runtime; 3877 long size; 3878 unsigned long offset; 3879 size_t dma_bytes; 3880 int err; 3881 3882 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3883 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3884 return -EINVAL; 3885 } else { 3886 if (!(area->vm_flags & VM_READ)) 3887 return -EINVAL; 3888 } 3889 runtime = substream->runtime; 3890 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3891 return -EBADFD; 3892 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3893 return -ENXIO; 3894 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3895 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3896 return -EINVAL; 3897 size = area->vm_end - area->vm_start; 3898 offset = area->vm_pgoff << PAGE_SHIFT; 3899 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3900 if ((size_t)size > dma_bytes) 3901 return -EINVAL; 3902 if (offset > dma_bytes - size) 3903 return -EINVAL; 3904 3905 area->vm_ops = &snd_pcm_vm_ops_data; 3906 area->vm_private_data = substream; 3907 if (substream->ops->mmap) 3908 err = substream->ops->mmap(substream, area); 3909 else 3910 err = snd_pcm_lib_default_mmap(substream, area); 3911 if (!err) 3912 atomic_inc(&substream->mmap_count); 3913 return err; 3914} 3915EXPORT_SYMBOL(snd_pcm_mmap_data); 3916 3917static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3918{ 3919 struct snd_pcm_file * pcm_file; 3920 struct snd_pcm_substream *substream; 3921 unsigned long offset; 3922 3923 pcm_file = file->private_data; 3924 substream = pcm_file->substream; 3925 if (PCM_RUNTIME_CHECK(substream)) 3926 return -ENXIO; 3927 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3928 return -EBADFD; 3929 3930 offset = area->vm_pgoff << PAGE_SHIFT; 3931 switch (offset) { 3932 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD: 3933 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3934 return -ENXIO; 3935 fallthrough; 3936 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 3937 if (!pcm_status_mmap_allowed(pcm_file)) 3938 return -ENXIO; 3939 return snd_pcm_mmap_status(substream, file, area); 3940 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD: 3941 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3942 return -ENXIO; 3943 fallthrough; 3944 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 3945 if (!pcm_control_mmap_allowed(pcm_file)) 3946 return -ENXIO; 3947 return snd_pcm_mmap_control(substream, file, area); 3948 default: 3949 return snd_pcm_mmap_data(substream, file, area); 3950 } 3951 return 0; 3952} 3953 3954static int snd_pcm_fasync(int fd, struct file * file, int on) 3955{ 3956 struct snd_pcm_file * pcm_file; 3957 struct snd_pcm_substream *substream; 3958 struct snd_pcm_runtime *runtime; 3959 3960 pcm_file = file->private_data; 3961 substream = pcm_file->substream; 3962 if (PCM_RUNTIME_CHECK(substream)) 3963 return -ENXIO; 3964 runtime = substream->runtime; 3965 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3966 return -EBADFD; 3967 return snd_fasync_helper(fd, file, on, &runtime->fasync); 3968} 3969 3970/* 3971 * ioctl32 compat 3972 */ 3973#ifdef CONFIG_COMPAT 3974#include "pcm_compat.c" 3975#else 3976#define snd_pcm_ioctl_compat NULL 3977#endif 3978 3979/* 3980 * To be removed helpers to keep binary compatibility 3981 */ 3982 3983#ifdef CONFIG_SND_SUPPORT_OLD_API 3984#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3985#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3986 3987static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3988 struct snd_pcm_hw_params_old *oparams) 3989{ 3990 unsigned int i; 3991 3992 memset(params, 0, sizeof(*params)); 3993 params->flags = oparams->flags; 3994 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3995 params->masks[i].bits[0] = oparams->masks[i]; 3996 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3997 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3998 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3999 params->info = oparams->info; 4000 params->msbits = oparams->msbits; 4001 params->rate_num = oparams->rate_num; 4002 params->rate_den = oparams->rate_den; 4003 params->fifo_size = oparams->fifo_size; 4004} 4005 4006static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 4007 struct snd_pcm_hw_params *params) 4008{ 4009 unsigned int i; 4010 4011 memset(oparams, 0, sizeof(*oparams)); 4012 oparams->flags = params->flags; 4013 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 4014 oparams->masks[i] = params->masks[i].bits[0]; 4015 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 4016 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 4017 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 4018 oparams->info = params->info; 4019 oparams->msbits = params->msbits; 4020 oparams->rate_num = params->rate_num; 4021 oparams->rate_den = params->rate_den; 4022 oparams->fifo_size = params->fifo_size; 4023} 4024 4025static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 4026 struct snd_pcm_hw_params_old __user * _oparams) 4027{ 4028 struct snd_pcm_hw_params *params; 4029 struct snd_pcm_hw_params_old *oparams = NULL; 4030 int err; 4031 4032 params = kmalloc(sizeof(*params), GFP_KERNEL); 4033 if (!params) 4034 return -ENOMEM; 4035 4036 oparams = memdup_user(_oparams, sizeof(*oparams)); 4037 if (IS_ERR(oparams)) { 4038 err = PTR_ERR(oparams); 4039 goto out; 4040 } 4041 snd_pcm_hw_convert_from_old_params(params, oparams); 4042 err = snd_pcm_hw_refine(substream, params); 4043 if (err < 0) 4044 goto out_old; 4045 4046 err = fixup_unreferenced_params(substream, params); 4047 if (err < 0) 4048 goto out_old; 4049 4050 snd_pcm_hw_convert_to_old_params(oparams, params); 4051 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 4052 err = -EFAULT; 4053out_old: 4054 kfree(oparams); 4055out: 4056 kfree(params); 4057 return err; 4058} 4059 4060static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 4061 struct snd_pcm_hw_params_old __user * _oparams) 4062{ 4063 struct snd_pcm_hw_params *params; 4064 struct snd_pcm_hw_params_old *oparams = NULL; 4065 int err; 4066 4067 params = kmalloc(sizeof(*params), GFP_KERNEL); 4068 if (!params) 4069 return -ENOMEM; 4070 4071 oparams = memdup_user(_oparams, sizeof(*oparams)); 4072 if (IS_ERR(oparams)) { 4073 err = PTR_ERR(oparams); 4074 goto out; 4075 } 4076 4077 snd_pcm_hw_convert_from_old_params(params, oparams); 4078 err = snd_pcm_hw_params(substream, params); 4079 if (err < 0) 4080 goto out_old; 4081 4082 snd_pcm_hw_convert_to_old_params(oparams, params); 4083 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 4084 err = -EFAULT; 4085out_old: 4086 kfree(oparams); 4087out: 4088 kfree(params); 4089 return err; 4090} 4091#endif /* CONFIG_SND_SUPPORT_OLD_API */ 4092 4093#ifndef CONFIG_MMU 4094static unsigned long snd_pcm_get_unmapped_area(struct file *file, 4095 unsigned long addr, 4096 unsigned long len, 4097 unsigned long pgoff, 4098 unsigned long flags) 4099{ 4100 struct snd_pcm_file *pcm_file = file->private_data; 4101 struct snd_pcm_substream *substream = pcm_file->substream; 4102 struct snd_pcm_runtime *runtime = substream->runtime; 4103 unsigned long offset = pgoff << PAGE_SHIFT; 4104 4105 switch (offset) { 4106 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 4107 return (unsigned long)runtime->status; 4108 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 4109 return (unsigned long)runtime->control; 4110 default: 4111 return (unsigned long)runtime->dma_area + offset; 4112 } 4113} 4114#else 4115# define snd_pcm_get_unmapped_area NULL 4116#endif 4117 4118/* 4119 * Register section 4120 */ 4121 4122const struct file_operations snd_pcm_f_ops[2] = { 4123 { 4124 .owner = THIS_MODULE, 4125 .write = snd_pcm_write, 4126 .write_iter = snd_pcm_writev, 4127 .open = snd_pcm_playback_open, 4128 .release = snd_pcm_release, 4129 .llseek = no_llseek, 4130 .poll = snd_pcm_poll, 4131 .unlocked_ioctl = snd_pcm_ioctl, 4132 .compat_ioctl = snd_pcm_ioctl_compat, 4133 .mmap = snd_pcm_mmap, 4134 .fasync = snd_pcm_fasync, 4135 .get_unmapped_area = snd_pcm_get_unmapped_area, 4136 }, 4137 { 4138 .owner = THIS_MODULE, 4139 .read = snd_pcm_read, 4140 .read_iter = snd_pcm_readv, 4141 .open = snd_pcm_capture_open, 4142 .release = snd_pcm_release, 4143 .llseek = no_llseek, 4144 .poll = snd_pcm_poll, 4145 .unlocked_ioctl = snd_pcm_ioctl, 4146 .compat_ioctl = snd_pcm_ioctl_compat, 4147 .mmap = snd_pcm_mmap, 4148 .fasync = snd_pcm_fasync, 4149 .get_unmapped_area = snd_pcm_get_unmapped_area, 4150 } 4151}; 4152