1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Digital Audio (PCM) abstract layer 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 */ 6 7 #include <linux/compat.h> 8 #include <linux/mm.h> 9 #include <linux/module.h> 10 #include <linux/file.h> 11 #include <linux/slab.h> 12 #include <linux/sched/signal.h> 13 #include <linux/time.h> 14 #include <linux/pm_qos.h> 15 #include <linux/io.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/vmalloc.h> 18 #include <sound/core.h> 19 #include <sound/control.h> 20 #include <sound/info.h> 21 #include <sound/pcm.h> 22 #include <sound/pcm_params.h> 23 #include <sound/timer.h> 24 #include <sound/minors.h> 25 #include <linux/uio.h> 26 #include <linux/delay.h> 27 28 #include "pcm_local.h" 29 30 #ifdef CONFIG_SND_DEBUG 31 #define CREATE_TRACE_POINTS 32 #include "pcm_param_trace.h" 33 #else 34 #define trace_hw_mask_param_enabled() 0 35 #define trace_hw_interval_param_enabled() 0 36 #define trace_hw_mask_param(substream, type, index, prev, curr) 37 #define trace_hw_interval_param(substream, type, index, prev, curr) 38 #endif 39 40 /* 41 * Compatibility 42 */ 43 44 struct snd_pcm_hw_params_old { 45 unsigned int flags; 46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 47 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 50 unsigned int rmask; 51 unsigned int cmask; 52 unsigned int info; 53 unsigned int msbits; 54 unsigned int rate_num; 55 unsigned int rate_den; 56 snd_pcm_uframes_t fifo_size; 57 unsigned char reserved[64]; 58 }; 59 60 #ifdef CONFIG_SND_SUPPORT_OLD_API 61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 63 64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 65 struct snd_pcm_hw_params_old __user * _oparams); 66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params_old __user * _oparams); 68 #endif 69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 70 71 /* 72 * 73 */ 74 75 static DECLARE_RWSEM(snd_pcm_link_rwsem); 76 77 void snd_pcm_group_init(struct snd_pcm_group *group) 78 { 79 spin_lock_init(&group->lock); 80 mutex_init(&group->mutex); 81 INIT_LIST_HEAD(&group->substreams); 82 refcount_set(&group->refs, 1); 83 } 84 85 /* define group lock helpers */ 86 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 87 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 88 { \ 89 if (nonatomic) \ 90 mutex_ ## mutex_action(&group->mutex); \ 91 else \ 92 spin_ ## action(&group->lock); \ 93 } 94 95 DEFINE_PCM_GROUP_LOCK(lock, lock); 96 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 97 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 98 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 99 100 /** 101 * snd_pcm_stream_lock - Lock the PCM stream 102 * @substream: PCM substream 103 * 104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 105 * flag of the given substream. This also takes the global link rw lock 106 * (or rw sem), too, for avoiding the race with linked streams. 107 */ 108 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 109 { 110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 111 } 112 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 113 114 /** 115 * snd_pcm_stream_unlock - Unlock the PCM stream 116 * @substream: PCM substream 117 * 118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 119 */ 120 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 121 { 122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 123 } 124 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 125 126 /** 127 * snd_pcm_stream_lock_irq - Lock the PCM stream 128 * @substream: PCM substream 129 * 130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 132 * as snd_pcm_stream_lock(). 133 */ 134 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 135 { 136 snd_pcm_group_lock_irq(&substream->self_group, 137 substream->pcm->nonatomic); 138 } 139 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 140 141 static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream) 142 { 143 struct snd_pcm_group *group = &substream->self_group; 144 145 if (substream->pcm->nonatomic) 146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING); 147 else 148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING); 149 } 150 151 /** 152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 153 * @substream: PCM substream 154 * 155 * This is a counter-part of snd_pcm_stream_lock_irq(). 156 */ 157 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 158 { 159 snd_pcm_group_unlock_irq(&substream->self_group, 160 substream->pcm->nonatomic); 161 } 162 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 163 164 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 165 { 166 unsigned long flags = 0; 167 if (substream->pcm->nonatomic) 168 mutex_lock(&substream->self_group.mutex); 169 else 170 spin_lock_irqsave(&substream->self_group.lock, flags); 171 return flags; 172 } 173 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 174 175 /** 176 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 177 * @substream: PCM substream 178 * @flags: irq flags 179 * 180 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 181 */ 182 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 183 unsigned long flags) 184 { 185 if (substream->pcm->nonatomic) 186 mutex_unlock(&substream->self_group.mutex); 187 else 188 spin_unlock_irqrestore(&substream->self_group.lock, flags); 189 } 190 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 191 192 /* Run PCM ioctl ops */ 193 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream, 194 unsigned cmd, void *arg) 195 { 196 if (substream->ops->ioctl) 197 return substream->ops->ioctl(substream, cmd, arg); 198 else 199 return snd_pcm_lib_ioctl(substream, cmd, arg); 200 } 201 202 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 203 { 204 struct snd_pcm *pcm = substream->pcm; 205 struct snd_pcm_str *pstr = substream->pstr; 206 207 memset(info, 0, sizeof(*info)); 208 info->card = pcm->card->number; 209 info->device = pcm->device; 210 info->stream = substream->stream; 211 info->subdevice = substream->number; 212 strscpy(info->id, pcm->id, sizeof(info->id)); 213 strscpy(info->name, pcm->name, sizeof(info->name)); 214 info->dev_class = pcm->dev_class; 215 info->dev_subclass = pcm->dev_subclass; 216 info->subdevices_count = pstr->substream_count; 217 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 218 strscpy(info->subname, substream->name, sizeof(info->subname)); 219 220 return 0; 221 } 222 223 int snd_pcm_info_user(struct snd_pcm_substream *substream, 224 struct snd_pcm_info __user * _info) 225 { 226 struct snd_pcm_info *info; 227 int err; 228 229 info = kmalloc(sizeof(*info), GFP_KERNEL); 230 if (! info) 231 return -ENOMEM; 232 err = snd_pcm_info(substream, info); 233 if (err >= 0) { 234 if (copy_to_user(_info, info, sizeof(*info))) 235 err = -EFAULT; 236 } 237 kfree(info); 238 return err; 239 } 240 241 /* macro for simplified cast */ 242 #define PARAM_MASK_BIT(b) (1U << (__force int)(b)) 243 244 static bool hw_support_mmap(struct snd_pcm_substream *substream) 245 { 246 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 247 return false; 248 249 if (substream->ops->mmap || 250 (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV && 251 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC)) 252 return true; 253 254 return dma_can_mmap(substream->dma_buffer.dev.dev); 255 } 256 257 static int constrain_mask_params(struct snd_pcm_substream *substream, 258 struct snd_pcm_hw_params *params) 259 { 260 struct snd_pcm_hw_constraints *constrs = 261 &substream->runtime->hw_constraints; 262 struct snd_mask *m; 263 unsigned int k; 264 struct snd_mask old_mask; 265 int changed; 266 267 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 268 m = hw_param_mask(params, k); 269 if (snd_mask_empty(m)) 270 return -EINVAL; 271 272 /* This parameter is not requested to change by a caller. */ 273 if (!(params->rmask & PARAM_MASK_BIT(k))) 274 continue; 275 276 if (trace_hw_mask_param_enabled()) 277 old_mask = *m; 278 279 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 280 if (changed < 0) 281 return changed; 282 if (changed == 0) 283 continue; 284 285 /* Set corresponding flag so that the caller gets it. */ 286 trace_hw_mask_param(substream, k, 0, &old_mask, m); 287 params->cmask |= PARAM_MASK_BIT(k); 288 } 289 290 return 0; 291 } 292 293 static int constrain_interval_params(struct snd_pcm_substream *substream, 294 struct snd_pcm_hw_params *params) 295 { 296 struct snd_pcm_hw_constraints *constrs = 297 &substream->runtime->hw_constraints; 298 struct snd_interval *i; 299 unsigned int k; 300 struct snd_interval old_interval; 301 int changed; 302 303 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 304 i = hw_param_interval(params, k); 305 if (snd_interval_empty(i)) 306 return -EINVAL; 307 308 /* This parameter is not requested to change by a caller. */ 309 if (!(params->rmask & PARAM_MASK_BIT(k))) 310 continue; 311 312 if (trace_hw_interval_param_enabled()) 313 old_interval = *i; 314 315 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 316 if (changed < 0) 317 return changed; 318 if (changed == 0) 319 continue; 320 321 /* Set corresponding flag so that the caller gets it. */ 322 trace_hw_interval_param(substream, k, 0, &old_interval, i); 323 params->cmask |= PARAM_MASK_BIT(k); 324 } 325 326 return 0; 327 } 328 329 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 330 struct snd_pcm_hw_params *params) 331 { 332 struct snd_pcm_hw_constraints *constrs = 333 &substream->runtime->hw_constraints; 334 unsigned int k; 335 unsigned int *rstamps; 336 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 337 unsigned int stamp; 338 struct snd_pcm_hw_rule *r; 339 unsigned int d; 340 struct snd_mask old_mask; 341 struct snd_interval old_interval; 342 bool again; 343 int changed, err = 0; 344 345 /* 346 * Each application of rule has own sequence number. 347 * 348 * Each member of 'rstamps' array represents the sequence number of 349 * recent application of corresponding rule. 350 */ 351 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 352 if (!rstamps) 353 return -ENOMEM; 354 355 /* 356 * Each member of 'vstamps' array represents the sequence number of 357 * recent application of rule in which corresponding parameters were 358 * changed. 359 * 360 * In initial state, elements corresponding to parameters requested by 361 * a caller is 1. For unrequested parameters, corresponding members 362 * have 0 so that the parameters are never changed anymore. 363 */ 364 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 365 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0; 366 367 /* Due to the above design, actual sequence number starts at 2. */ 368 stamp = 2; 369 retry: 370 /* Apply all rules in order. */ 371 again = false; 372 for (k = 0; k < constrs->rules_num; k++) { 373 r = &constrs->rules[k]; 374 375 /* 376 * Check condition bits of this rule. When the rule has 377 * some condition bits, parameter without the bits is 378 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 379 * is an example of the condition bits. 380 */ 381 if (r->cond && !(r->cond & params->flags)) 382 continue; 383 384 /* 385 * The 'deps' array includes maximum four dependencies 386 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth 387 * member of this array is a sentinel and should be 388 * negative value. 389 * 390 * This rule should be processed in this time when dependent 391 * parameters were changed at former applications of the other 392 * rules. 393 */ 394 for (d = 0; r->deps[d] >= 0; d++) { 395 if (vstamps[r->deps[d]] > rstamps[k]) 396 break; 397 } 398 if (r->deps[d] < 0) 399 continue; 400 401 if (trace_hw_mask_param_enabled()) { 402 if (hw_is_mask(r->var)) 403 old_mask = *hw_param_mask(params, r->var); 404 } 405 if (trace_hw_interval_param_enabled()) { 406 if (hw_is_interval(r->var)) 407 old_interval = *hw_param_interval(params, r->var); 408 } 409 410 changed = r->func(params, r); 411 if (changed < 0) { 412 err = changed; 413 goto out; 414 } 415 416 /* 417 * When the parameter is changed, notify it to the caller 418 * by corresponding returned bit, then preparing for next 419 * iteration. 420 */ 421 if (changed && r->var >= 0) { 422 if (hw_is_mask(r->var)) { 423 trace_hw_mask_param(substream, r->var, 424 k + 1, &old_mask, 425 hw_param_mask(params, r->var)); 426 } 427 if (hw_is_interval(r->var)) { 428 trace_hw_interval_param(substream, r->var, 429 k + 1, &old_interval, 430 hw_param_interval(params, r->var)); 431 } 432 433 params->cmask |= PARAM_MASK_BIT(r->var); 434 vstamps[r->var] = stamp; 435 again = true; 436 } 437 438 rstamps[k] = stamp++; 439 } 440 441 /* Iterate to evaluate all rules till no parameters are changed. */ 442 if (again) 443 goto retry; 444 445 out: 446 kfree(rstamps); 447 return err; 448 } 449 450 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 451 struct snd_pcm_hw_params *params) 452 { 453 const struct snd_interval *i; 454 const struct snd_mask *m; 455 int err; 456 457 if (!params->msbits) { 458 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 459 if (snd_interval_single(i)) 460 params->msbits = snd_interval_value(i); 461 } 462 463 if (!params->rate_den) { 464 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 465 if (snd_interval_single(i)) { 466 params->rate_num = snd_interval_value(i); 467 params->rate_den = 1; 468 } 469 } 470 471 if (!params->fifo_size) { 472 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 473 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 474 if (snd_mask_single(m) && snd_interval_single(i)) { 475 err = snd_pcm_ops_ioctl(substream, 476 SNDRV_PCM_IOCTL1_FIFO_SIZE, 477 params); 478 if (err < 0) 479 return err; 480 } 481 } 482 483 if (!params->info) { 484 params->info = substream->runtime->hw.info; 485 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 486 SNDRV_PCM_INFO_DRAIN_TRIGGER); 487 if (!hw_support_mmap(substream)) 488 params->info &= ~(SNDRV_PCM_INFO_MMAP | 489 SNDRV_PCM_INFO_MMAP_VALID); 490 } 491 492 return 0; 493 } 494 495 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 496 struct snd_pcm_hw_params *params) 497 { 498 int err; 499 500 params->info = 0; 501 params->fifo_size = 0; 502 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 503 params->msbits = 0; 504 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) { 505 params->rate_num = 0; 506 params->rate_den = 0; 507 } 508 509 err = constrain_mask_params(substream, params); 510 if (err < 0) 511 return err; 512 513 err = constrain_interval_params(substream, params); 514 if (err < 0) 515 return err; 516 517 err = constrain_params_by_rules(substream, params); 518 if (err < 0) 519 return err; 520 521 params->rmask = 0; 522 523 return 0; 524 } 525 EXPORT_SYMBOL(snd_pcm_hw_refine); 526 527 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 528 struct snd_pcm_hw_params __user * _params) 529 { 530 struct snd_pcm_hw_params *params; 531 int err; 532 533 params = memdup_user(_params, sizeof(*params)); 534 if (IS_ERR(params)) 535 return PTR_ERR(params); 536 537 err = snd_pcm_hw_refine(substream, params); 538 if (err < 0) 539 goto end; 540 541 err = fixup_unreferenced_params(substream, params); 542 if (err < 0) 543 goto end; 544 545 if (copy_to_user(_params, params, sizeof(*params))) 546 err = -EFAULT; 547 end: 548 kfree(params); 549 return err; 550 } 551 552 static int period_to_usecs(struct snd_pcm_runtime *runtime) 553 { 554 int usecs; 555 556 if (! runtime->rate) 557 return -1; /* invalid */ 558 559 /* take 75% of period time as the deadline */ 560 usecs = (750000 / runtime->rate) * runtime->period_size; 561 usecs += ((750000 % runtime->rate) * runtime->period_size) / 562 runtime->rate; 563 564 return usecs; 565 } 566 567 static void snd_pcm_set_state(struct snd_pcm_substream *substream, 568 snd_pcm_state_t state) 569 { 570 snd_pcm_stream_lock_irq(substream); 571 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 572 substream->runtime->status->state = state; 573 snd_pcm_stream_unlock_irq(substream); 574 } 575 576 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 577 int event) 578 { 579 #ifdef CONFIG_SND_PCM_TIMER 580 if (substream->timer) 581 snd_timer_notify(substream->timer, event, 582 &substream->runtime->trigger_tstamp); 583 #endif 584 } 585 586 void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq) 587 { 588 if (substream->runtime && substream->runtime->stop_operating) { 589 substream->runtime->stop_operating = false; 590 if (substream->ops && substream->ops->sync_stop) 591 substream->ops->sync_stop(substream); 592 else if (sync_irq && substream->pcm->card->sync_irq > 0) 593 synchronize_irq(substream->pcm->card->sync_irq); 594 } 595 } 596 597 /** 598 * snd_pcm_hw_params_choose - choose a configuration defined by @params 599 * @pcm: PCM instance 600 * @params: the hw_params instance 601 * 602 * Choose one configuration from configuration space defined by @params. 603 * The configuration chosen is that obtained fixing in this order: 604 * first access, first format, first subformat, min channels, 605 * min rate, min period time, max buffer size, min tick time 606 * 607 * Return: Zero if successful, or a negative error code on failure. 608 */ 609 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 610 struct snd_pcm_hw_params *params) 611 { 612 static const int vars[] = { 613 SNDRV_PCM_HW_PARAM_ACCESS, 614 SNDRV_PCM_HW_PARAM_FORMAT, 615 SNDRV_PCM_HW_PARAM_SUBFORMAT, 616 SNDRV_PCM_HW_PARAM_CHANNELS, 617 SNDRV_PCM_HW_PARAM_RATE, 618 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 619 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 620 SNDRV_PCM_HW_PARAM_TICK_TIME, 621 -1 622 }; 623 const int *v; 624 struct snd_mask old_mask; 625 struct snd_interval old_interval; 626 int changed; 627 628 for (v = vars; *v != -1; v++) { 629 /* Keep old parameter to trace. */ 630 if (trace_hw_mask_param_enabled()) { 631 if (hw_is_mask(*v)) 632 old_mask = *hw_param_mask(params, *v); 633 } 634 if (trace_hw_interval_param_enabled()) { 635 if (hw_is_interval(*v)) 636 old_interval = *hw_param_interval(params, *v); 637 } 638 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 639 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 640 else 641 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 642 if (changed < 0) 643 return changed; 644 if (changed == 0) 645 continue; 646 647 /* Trace the changed parameter. */ 648 if (hw_is_mask(*v)) { 649 trace_hw_mask_param(pcm, *v, 0, &old_mask, 650 hw_param_mask(params, *v)); 651 } 652 if (hw_is_interval(*v)) { 653 trace_hw_interval_param(pcm, *v, 0, &old_interval, 654 hw_param_interval(params, *v)); 655 } 656 } 657 658 return 0; 659 } 660 661 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 662 struct snd_pcm_hw_params *params) 663 { 664 struct snd_pcm_runtime *runtime; 665 int err, usecs; 666 unsigned int bits; 667 snd_pcm_uframes_t frames; 668 669 if (PCM_RUNTIME_CHECK(substream)) 670 return -ENXIO; 671 runtime = substream->runtime; 672 snd_pcm_stream_lock_irq(substream); 673 switch (runtime->status->state) { 674 case SNDRV_PCM_STATE_OPEN: 675 case SNDRV_PCM_STATE_SETUP: 676 case SNDRV_PCM_STATE_PREPARED: 677 break; 678 default: 679 snd_pcm_stream_unlock_irq(substream); 680 return -EBADFD; 681 } 682 snd_pcm_stream_unlock_irq(substream); 683 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 684 if (!substream->oss.oss) 685 #endif 686 if (atomic_read(&substream->mmap_count)) 687 return -EBADFD; 688 689 snd_pcm_sync_stop(substream, true); 690 691 params->rmask = ~0U; 692 err = snd_pcm_hw_refine(substream, params); 693 if (err < 0) 694 goto _error; 695 696 err = snd_pcm_hw_params_choose(substream, params); 697 if (err < 0) 698 goto _error; 699 700 err = fixup_unreferenced_params(substream, params); 701 if (err < 0) 702 goto _error; 703 704 if (substream->managed_buffer_alloc) { 705 err = snd_pcm_lib_malloc_pages(substream, 706 params_buffer_bytes(params)); 707 if (err < 0) 708 goto _error; 709 runtime->buffer_changed = err > 0; 710 } 711 712 if (substream->ops->hw_params != NULL) { 713 err = substream->ops->hw_params(substream, params); 714 if (err < 0) 715 goto _error; 716 } 717 718 runtime->access = params_access(params); 719 runtime->format = params_format(params); 720 runtime->subformat = params_subformat(params); 721 runtime->channels = params_channels(params); 722 runtime->rate = params_rate(params); 723 runtime->period_size = params_period_size(params); 724 runtime->periods = params_periods(params); 725 runtime->buffer_size = params_buffer_size(params); 726 runtime->info = params->info; 727 runtime->rate_num = params->rate_num; 728 runtime->rate_den = params->rate_den; 729 runtime->no_period_wakeup = 730 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 731 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 732 733 bits = snd_pcm_format_physical_width(runtime->format); 734 runtime->sample_bits = bits; 735 bits *= runtime->channels; 736 runtime->frame_bits = bits; 737 frames = 1; 738 while (bits % 8 != 0) { 739 bits *= 2; 740 frames *= 2; 741 } 742 runtime->byte_align = bits / 8; 743 runtime->min_align = frames; 744 745 /* Default sw params */ 746 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 747 runtime->period_step = 1; 748 runtime->control->avail_min = runtime->period_size; 749 runtime->start_threshold = 1; 750 runtime->stop_threshold = runtime->buffer_size; 751 runtime->silence_threshold = 0; 752 runtime->silence_size = 0; 753 runtime->boundary = runtime->buffer_size; 754 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 755 runtime->boundary *= 2; 756 757 /* clear the buffer for avoiding possible kernel info leaks */ 758 if (runtime->dma_area && !substream->ops->copy_user) { 759 size_t size = runtime->dma_bytes; 760 761 if (runtime->info & SNDRV_PCM_INFO_MMAP) 762 size = PAGE_ALIGN(size); 763 memset(runtime->dma_area, 0, size); 764 } 765 766 snd_pcm_timer_resolution_change(substream); 767 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 768 769 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 770 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 771 if ((usecs = period_to_usecs(runtime)) >= 0) 772 cpu_latency_qos_add_request(&substream->latency_pm_qos_req, 773 usecs); 774 return 0; 775 _error: 776 /* hardware might be unusable from this time, 777 so we force application to retry to set 778 the correct hardware parameter settings */ 779 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 780 if (substream->ops->hw_free != NULL) 781 substream->ops->hw_free(substream); 782 if (substream->managed_buffer_alloc) 783 snd_pcm_lib_free_pages(substream); 784 return err; 785 } 786 787 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 788 struct snd_pcm_hw_params __user * _params) 789 { 790 struct snd_pcm_hw_params *params; 791 int err; 792 793 params = memdup_user(_params, sizeof(*params)); 794 if (IS_ERR(params)) 795 return PTR_ERR(params); 796 797 err = snd_pcm_hw_params(substream, params); 798 if (err < 0) 799 goto end; 800 801 if (copy_to_user(_params, params, sizeof(*params))) 802 err = -EFAULT; 803 end: 804 kfree(params); 805 return err; 806 } 807 808 static int do_hw_free(struct snd_pcm_substream *substream) 809 { 810 int result = 0; 811 812 snd_pcm_sync_stop(substream, true); 813 if (substream->ops->hw_free) 814 result = substream->ops->hw_free(substream); 815 if (substream->managed_buffer_alloc) 816 snd_pcm_lib_free_pages(substream); 817 return result; 818 } 819 820 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 821 { 822 struct snd_pcm_runtime *runtime; 823 int result; 824 825 if (PCM_RUNTIME_CHECK(substream)) 826 return -ENXIO; 827 runtime = substream->runtime; 828 snd_pcm_stream_lock_irq(substream); 829 switch (runtime->status->state) { 830 case SNDRV_PCM_STATE_SETUP: 831 case SNDRV_PCM_STATE_PREPARED: 832 break; 833 default: 834 snd_pcm_stream_unlock_irq(substream); 835 return -EBADFD; 836 } 837 snd_pcm_stream_unlock_irq(substream); 838 if (atomic_read(&substream->mmap_count)) 839 return -EBADFD; 840 result = do_hw_free(substream); 841 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 842 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 843 return result; 844 } 845 846 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 847 struct snd_pcm_sw_params *params) 848 { 849 struct snd_pcm_runtime *runtime; 850 int err; 851 852 if (PCM_RUNTIME_CHECK(substream)) 853 return -ENXIO; 854 runtime = substream->runtime; 855 snd_pcm_stream_lock_irq(substream); 856 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 857 snd_pcm_stream_unlock_irq(substream); 858 return -EBADFD; 859 } 860 snd_pcm_stream_unlock_irq(substream); 861 862 if (params->tstamp_mode < 0 || 863 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 864 return -EINVAL; 865 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 866 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 867 return -EINVAL; 868 if (params->avail_min == 0) 869 return -EINVAL; 870 if (params->silence_size >= runtime->boundary) { 871 if (params->silence_threshold != 0) 872 return -EINVAL; 873 } else { 874 if (params->silence_size > params->silence_threshold) 875 return -EINVAL; 876 if (params->silence_threshold > runtime->buffer_size) 877 return -EINVAL; 878 } 879 err = 0; 880 snd_pcm_stream_lock_irq(substream); 881 runtime->tstamp_mode = params->tstamp_mode; 882 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 883 runtime->tstamp_type = params->tstamp_type; 884 runtime->period_step = params->period_step; 885 runtime->control->avail_min = params->avail_min; 886 runtime->start_threshold = params->start_threshold; 887 runtime->stop_threshold = params->stop_threshold; 888 runtime->silence_threshold = params->silence_threshold; 889 runtime->silence_size = params->silence_size; 890 params->boundary = runtime->boundary; 891 if (snd_pcm_running(substream)) { 892 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 893 runtime->silence_size > 0) 894 snd_pcm_playback_silence(substream, ULONG_MAX); 895 err = snd_pcm_update_state(substream, runtime); 896 } 897 snd_pcm_stream_unlock_irq(substream); 898 return err; 899 } 900 901 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 902 struct snd_pcm_sw_params __user * _params) 903 { 904 struct snd_pcm_sw_params params; 905 int err; 906 if (copy_from_user(¶ms, _params, sizeof(params))) 907 return -EFAULT; 908 err = snd_pcm_sw_params(substream, ¶ms); 909 if (copy_to_user(_params, ¶ms, sizeof(params))) 910 return -EFAULT; 911 return err; 912 } 913 914 static inline snd_pcm_uframes_t 915 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 916 { 917 snd_pcm_uframes_t delay; 918 919 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 920 delay = snd_pcm_playback_hw_avail(substream->runtime); 921 else 922 delay = snd_pcm_capture_avail(substream->runtime); 923 return delay + substream->runtime->delay; 924 } 925 926 int snd_pcm_status64(struct snd_pcm_substream *substream, 927 struct snd_pcm_status64 *status) 928 { 929 struct snd_pcm_runtime *runtime = substream->runtime; 930 931 snd_pcm_stream_lock_irq(substream); 932 933 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 934 &runtime->audio_tstamp_config); 935 936 /* backwards compatible behavior */ 937 if (runtime->audio_tstamp_config.type_requested == 938 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 939 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 940 runtime->audio_tstamp_config.type_requested = 941 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 942 else 943 runtime->audio_tstamp_config.type_requested = 944 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 945 runtime->audio_tstamp_report.valid = 0; 946 } else 947 runtime->audio_tstamp_report.valid = 1; 948 949 status->state = runtime->status->state; 950 status->suspended_state = runtime->status->suspended_state; 951 if (status->state == SNDRV_PCM_STATE_OPEN) 952 goto _end; 953 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec; 954 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec; 955 if (snd_pcm_running(substream)) { 956 snd_pcm_update_hw_ptr(substream); 957 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 958 status->tstamp_sec = runtime->status->tstamp.tv_sec; 959 status->tstamp_nsec = 960 runtime->status->tstamp.tv_nsec; 961 status->driver_tstamp_sec = 962 runtime->driver_tstamp.tv_sec; 963 status->driver_tstamp_nsec = 964 runtime->driver_tstamp.tv_nsec; 965 status->audio_tstamp_sec = 966 runtime->status->audio_tstamp.tv_sec; 967 status->audio_tstamp_nsec = 968 runtime->status->audio_tstamp.tv_nsec; 969 if (runtime->audio_tstamp_report.valid == 1) 970 /* backwards compatibility, no report provided in COMPAT mode */ 971 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 972 &status->audio_tstamp_accuracy, 973 &runtime->audio_tstamp_report); 974 975 goto _tstamp_end; 976 } 977 } else { 978 /* get tstamp only in fallback mode and only if enabled */ 979 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 980 struct timespec64 tstamp; 981 982 snd_pcm_gettime(runtime, &tstamp); 983 status->tstamp_sec = tstamp.tv_sec; 984 status->tstamp_nsec = tstamp.tv_nsec; 985 } 986 } 987 _tstamp_end: 988 status->appl_ptr = runtime->control->appl_ptr; 989 status->hw_ptr = runtime->status->hw_ptr; 990 status->avail = snd_pcm_avail(substream); 991 status->delay = snd_pcm_running(substream) ? 992 snd_pcm_calc_delay(substream) : 0; 993 status->avail_max = runtime->avail_max; 994 status->overrange = runtime->overrange; 995 runtime->avail_max = 0; 996 runtime->overrange = 0; 997 _end: 998 snd_pcm_stream_unlock_irq(substream); 999 return 0; 1000 } 1001 1002 static int snd_pcm_status_user64(struct snd_pcm_substream *substream, 1003 struct snd_pcm_status64 __user * _status, 1004 bool ext) 1005 { 1006 struct snd_pcm_status64 status; 1007 int res; 1008 1009 memset(&status, 0, sizeof(status)); 1010 /* 1011 * with extension, parameters are read/write, 1012 * get audio_tstamp_data from user, 1013 * ignore rest of status structure 1014 */ 1015 if (ext && get_user(status.audio_tstamp_data, 1016 (u32 __user *)(&_status->audio_tstamp_data))) 1017 return -EFAULT; 1018 res = snd_pcm_status64(substream, &status); 1019 if (res < 0) 1020 return res; 1021 if (copy_to_user(_status, &status, sizeof(status))) 1022 return -EFAULT; 1023 return 0; 1024 } 1025 1026 static int snd_pcm_status_user32(struct snd_pcm_substream *substream, 1027 struct snd_pcm_status32 __user * _status, 1028 bool ext) 1029 { 1030 struct snd_pcm_status64 status64; 1031 struct snd_pcm_status32 status32; 1032 int res; 1033 1034 memset(&status64, 0, sizeof(status64)); 1035 memset(&status32, 0, sizeof(status32)); 1036 /* 1037 * with extension, parameters are read/write, 1038 * get audio_tstamp_data from user, 1039 * ignore rest of status structure 1040 */ 1041 if (ext && get_user(status64.audio_tstamp_data, 1042 (u32 __user *)(&_status->audio_tstamp_data))) 1043 return -EFAULT; 1044 res = snd_pcm_status64(substream, &status64); 1045 if (res < 0) 1046 return res; 1047 1048 status32 = (struct snd_pcm_status32) { 1049 .state = status64.state, 1050 .trigger_tstamp_sec = status64.trigger_tstamp_sec, 1051 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec, 1052 .tstamp_sec = status64.tstamp_sec, 1053 .tstamp_nsec = status64.tstamp_nsec, 1054 .appl_ptr = status64.appl_ptr, 1055 .hw_ptr = status64.hw_ptr, 1056 .delay = status64.delay, 1057 .avail = status64.avail, 1058 .avail_max = status64.avail_max, 1059 .overrange = status64.overrange, 1060 .suspended_state = status64.suspended_state, 1061 .audio_tstamp_data = status64.audio_tstamp_data, 1062 .audio_tstamp_sec = status64.audio_tstamp_sec, 1063 .audio_tstamp_nsec = status64.audio_tstamp_nsec, 1064 .driver_tstamp_sec = status64.audio_tstamp_sec, 1065 .driver_tstamp_nsec = status64.audio_tstamp_nsec, 1066 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy, 1067 }; 1068 1069 if (copy_to_user(_status, &status32, sizeof(status32))) 1070 return -EFAULT; 1071 1072 return 0; 1073 } 1074 1075 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 1076 struct snd_pcm_channel_info * info) 1077 { 1078 struct snd_pcm_runtime *runtime; 1079 unsigned int channel; 1080 1081 channel = info->channel; 1082 runtime = substream->runtime; 1083 snd_pcm_stream_lock_irq(substream); 1084 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 1085 snd_pcm_stream_unlock_irq(substream); 1086 return -EBADFD; 1087 } 1088 snd_pcm_stream_unlock_irq(substream); 1089 if (channel >= runtime->channels) 1090 return -EINVAL; 1091 memset(info, 0, sizeof(*info)); 1092 info->channel = channel; 1093 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1094 } 1095 1096 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1097 struct snd_pcm_channel_info __user * _info) 1098 { 1099 struct snd_pcm_channel_info info; 1100 int res; 1101 1102 if (copy_from_user(&info, _info, sizeof(info))) 1103 return -EFAULT; 1104 res = snd_pcm_channel_info(substream, &info); 1105 if (res < 0) 1106 return res; 1107 if (copy_to_user(_info, &info, sizeof(info))) 1108 return -EFAULT; 1109 return 0; 1110 } 1111 1112 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1113 { 1114 struct snd_pcm_runtime *runtime = substream->runtime; 1115 if (runtime->trigger_master == NULL) 1116 return; 1117 if (runtime->trigger_master == substream) { 1118 if (!runtime->trigger_tstamp_latched) 1119 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1120 } else { 1121 snd_pcm_trigger_tstamp(runtime->trigger_master); 1122 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1123 } 1124 runtime->trigger_master = NULL; 1125 } 1126 1127 #define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0 1128 1129 struct action_ops { 1130 int (*pre_action)(struct snd_pcm_substream *substream, 1131 snd_pcm_state_t state); 1132 int (*do_action)(struct snd_pcm_substream *substream, 1133 snd_pcm_state_t state); 1134 void (*undo_action)(struct snd_pcm_substream *substream, 1135 snd_pcm_state_t state); 1136 void (*post_action)(struct snd_pcm_substream *substream, 1137 snd_pcm_state_t state); 1138 }; 1139 1140 /* 1141 * this functions is core for handling of linked stream 1142 * Note: the stream state might be changed also on failure 1143 * Note2: call with calling stream lock + link lock 1144 */ 1145 static int snd_pcm_action_group(const struct action_ops *ops, 1146 struct snd_pcm_substream *substream, 1147 snd_pcm_state_t state, 1148 bool do_lock) 1149 { 1150 struct snd_pcm_substream *s = NULL; 1151 struct snd_pcm_substream *s1; 1152 int res = 0, depth = 1; 1153 1154 snd_pcm_group_for_each_entry(s, substream) { 1155 if (do_lock && s != substream) { 1156 if (s->pcm->nonatomic) 1157 mutex_lock_nested(&s->self_group.mutex, depth); 1158 else 1159 spin_lock_nested(&s->self_group.lock, depth); 1160 depth++; 1161 } 1162 res = ops->pre_action(s, state); 1163 if (res < 0) 1164 goto _unlock; 1165 } 1166 snd_pcm_group_for_each_entry(s, substream) { 1167 res = ops->do_action(s, state); 1168 if (res < 0) { 1169 if (ops->undo_action) { 1170 snd_pcm_group_for_each_entry(s1, substream) { 1171 if (s1 == s) /* failed stream */ 1172 break; 1173 ops->undo_action(s1, state); 1174 } 1175 } 1176 s = NULL; /* unlock all */ 1177 goto _unlock; 1178 } 1179 } 1180 snd_pcm_group_for_each_entry(s, substream) { 1181 ops->post_action(s, state); 1182 } 1183 _unlock: 1184 if (do_lock) { 1185 /* unlock streams */ 1186 snd_pcm_group_for_each_entry(s1, substream) { 1187 if (s1 != substream) { 1188 if (s1->pcm->nonatomic) 1189 mutex_unlock(&s1->self_group.mutex); 1190 else 1191 spin_unlock(&s1->self_group.lock); 1192 } 1193 if (s1 == s) /* end */ 1194 break; 1195 } 1196 } 1197 return res; 1198 } 1199 1200 /* 1201 * Note: call with stream lock 1202 */ 1203 static int snd_pcm_action_single(const struct action_ops *ops, 1204 struct snd_pcm_substream *substream, 1205 snd_pcm_state_t state) 1206 { 1207 int res; 1208 1209 res = ops->pre_action(substream, state); 1210 if (res < 0) 1211 return res; 1212 res = ops->do_action(substream, state); 1213 if (res == 0) 1214 ops->post_action(substream, state); 1215 else if (ops->undo_action) 1216 ops->undo_action(substream, state); 1217 return res; 1218 } 1219 1220 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1221 struct snd_pcm_group *new_group) 1222 { 1223 substream->group = new_group; 1224 list_move(&substream->link_list, &new_group->substreams); 1225 } 1226 1227 /* 1228 * Unref and unlock the group, but keep the stream lock; 1229 * when the group becomes empty and no longer referred, destroy itself 1230 */ 1231 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1232 struct snd_pcm_substream *substream) 1233 { 1234 bool do_free; 1235 1236 if (!group) 1237 return; 1238 do_free = refcount_dec_and_test(&group->refs); 1239 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1240 if (do_free) 1241 kfree(group); 1242 } 1243 1244 /* 1245 * Lock the group inside a stream lock and reference it; 1246 * return the locked group object, or NULL if not linked 1247 */ 1248 static struct snd_pcm_group * 1249 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1250 { 1251 bool nonatomic = substream->pcm->nonatomic; 1252 struct snd_pcm_group *group; 1253 bool trylock; 1254 1255 for (;;) { 1256 if (!snd_pcm_stream_linked(substream)) 1257 return NULL; 1258 group = substream->group; 1259 /* block freeing the group object */ 1260 refcount_inc(&group->refs); 1261 1262 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1263 spin_trylock(&group->lock); 1264 if (trylock) 1265 break; /* OK */ 1266 1267 /* re-lock for avoiding ABBA deadlock */ 1268 snd_pcm_stream_unlock(substream); 1269 snd_pcm_group_lock(group, nonatomic); 1270 snd_pcm_stream_lock(substream); 1271 1272 /* check the group again; the above opens a small race window */ 1273 if (substream->group == group) 1274 break; /* OK */ 1275 /* group changed, try again */ 1276 snd_pcm_group_unref(group, substream); 1277 } 1278 return group; 1279 } 1280 1281 /* 1282 * Note: call with stream lock 1283 */ 1284 static int snd_pcm_action(const struct action_ops *ops, 1285 struct snd_pcm_substream *substream, 1286 snd_pcm_state_t state) 1287 { 1288 struct snd_pcm_group *group; 1289 int res; 1290 1291 group = snd_pcm_stream_group_ref(substream); 1292 if (group) 1293 res = snd_pcm_action_group(ops, substream, state, true); 1294 else 1295 res = snd_pcm_action_single(ops, substream, state); 1296 snd_pcm_group_unref(group, substream); 1297 return res; 1298 } 1299 1300 /* 1301 * Note: don't use any locks before 1302 */ 1303 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1304 struct snd_pcm_substream *substream, 1305 snd_pcm_state_t state) 1306 { 1307 int res; 1308 1309 snd_pcm_stream_lock_irq(substream); 1310 res = snd_pcm_action(ops, substream, state); 1311 snd_pcm_stream_unlock_irq(substream); 1312 return res; 1313 } 1314 1315 /* 1316 */ 1317 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1318 struct snd_pcm_substream *substream, 1319 snd_pcm_state_t state) 1320 { 1321 int res; 1322 1323 /* Guarantee the group members won't change during non-atomic action */ 1324 down_read(&snd_pcm_link_rwsem); 1325 if (snd_pcm_stream_linked(substream)) 1326 res = snd_pcm_action_group(ops, substream, state, false); 1327 else 1328 res = snd_pcm_action_single(ops, substream, state); 1329 up_read(&snd_pcm_link_rwsem); 1330 return res; 1331 } 1332 1333 /* 1334 * start callbacks 1335 */ 1336 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, 1337 snd_pcm_state_t state) 1338 { 1339 struct snd_pcm_runtime *runtime = substream->runtime; 1340 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 1341 return -EBADFD; 1342 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1343 !snd_pcm_playback_data(substream)) 1344 return -EPIPE; 1345 runtime->trigger_tstamp_latched = false; 1346 runtime->trigger_master = substream; 1347 return 0; 1348 } 1349 1350 static int snd_pcm_do_start(struct snd_pcm_substream *substream, 1351 snd_pcm_state_t state) 1352 { 1353 if (substream->runtime->trigger_master != substream) 1354 return 0; 1355 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1356 } 1357 1358 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, 1359 snd_pcm_state_t state) 1360 { 1361 if (substream->runtime->trigger_master == substream) 1362 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1363 } 1364 1365 static void snd_pcm_post_start(struct snd_pcm_substream *substream, 1366 snd_pcm_state_t state) 1367 { 1368 struct snd_pcm_runtime *runtime = substream->runtime; 1369 snd_pcm_trigger_tstamp(substream); 1370 runtime->hw_ptr_jiffies = jiffies; 1371 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1372 runtime->rate; 1373 runtime->status->state = state; 1374 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1375 runtime->silence_size > 0) 1376 snd_pcm_playback_silence(substream, ULONG_MAX); 1377 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1378 } 1379 1380 static const struct action_ops snd_pcm_action_start = { 1381 .pre_action = snd_pcm_pre_start, 1382 .do_action = snd_pcm_do_start, 1383 .undo_action = snd_pcm_undo_start, 1384 .post_action = snd_pcm_post_start 1385 }; 1386 1387 /** 1388 * snd_pcm_start - start all linked streams 1389 * @substream: the PCM substream instance 1390 * 1391 * Return: Zero if successful, or a negative error code. 1392 * The stream lock must be acquired before calling this function. 1393 */ 1394 int snd_pcm_start(struct snd_pcm_substream *substream) 1395 { 1396 return snd_pcm_action(&snd_pcm_action_start, substream, 1397 SNDRV_PCM_STATE_RUNNING); 1398 } 1399 1400 /* take the stream lock and start the streams */ 1401 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1402 { 1403 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1404 SNDRV_PCM_STATE_RUNNING); 1405 } 1406 1407 /* 1408 * stop callbacks 1409 */ 1410 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, 1411 snd_pcm_state_t state) 1412 { 1413 struct snd_pcm_runtime *runtime = substream->runtime; 1414 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1415 return -EBADFD; 1416 runtime->trigger_master = substream; 1417 return 0; 1418 } 1419 1420 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, 1421 snd_pcm_state_t state) 1422 { 1423 if (substream->runtime->trigger_master == substream && 1424 snd_pcm_running(substream)) { 1425 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1426 substream->runtime->stop_operating = true; 1427 } 1428 return 0; /* unconditonally stop all substreams */ 1429 } 1430 1431 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, 1432 snd_pcm_state_t state) 1433 { 1434 struct snd_pcm_runtime *runtime = substream->runtime; 1435 if (runtime->status->state != state) { 1436 snd_pcm_trigger_tstamp(substream); 1437 runtime->status->state = state; 1438 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1439 } 1440 wake_up(&runtime->sleep); 1441 wake_up(&runtime->tsleep); 1442 } 1443 1444 static const struct action_ops snd_pcm_action_stop = { 1445 .pre_action = snd_pcm_pre_stop, 1446 .do_action = snd_pcm_do_stop, 1447 .post_action = snd_pcm_post_stop 1448 }; 1449 1450 /** 1451 * snd_pcm_stop - try to stop all running streams in the substream group 1452 * @substream: the PCM substream instance 1453 * @state: PCM state after stopping the stream 1454 * 1455 * The state of each stream is then changed to the given state unconditionally. 1456 * 1457 * Return: Zero if successful, or a negative error code. 1458 */ 1459 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1460 { 1461 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1462 } 1463 EXPORT_SYMBOL(snd_pcm_stop); 1464 1465 /** 1466 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1467 * @substream: the PCM substream 1468 * 1469 * After stopping, the state is changed to SETUP. 1470 * Unlike snd_pcm_stop(), this affects only the given stream. 1471 * 1472 * Return: Zero if succesful, or a negative error code. 1473 */ 1474 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1475 { 1476 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1477 SNDRV_PCM_STATE_SETUP); 1478 } 1479 1480 /** 1481 * snd_pcm_stop_xrun - stop the running streams as XRUN 1482 * @substream: the PCM substream instance 1483 * 1484 * This stops the given running substream (and all linked substreams) as XRUN. 1485 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1486 * 1487 * Return: Zero if successful, or a negative error code. 1488 */ 1489 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1490 { 1491 unsigned long flags; 1492 1493 snd_pcm_stream_lock_irqsave(substream, flags); 1494 if (substream->runtime && snd_pcm_running(substream)) 1495 __snd_pcm_xrun(substream); 1496 snd_pcm_stream_unlock_irqrestore(substream, flags); 1497 return 0; 1498 } 1499 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1500 1501 /* 1502 * pause callbacks: pass boolean (to start pause or resume) as state argument 1503 */ 1504 #define pause_pushed(state) (__force bool)(state) 1505 1506 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, 1507 snd_pcm_state_t state) 1508 { 1509 struct snd_pcm_runtime *runtime = substream->runtime; 1510 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1511 return -ENOSYS; 1512 if (pause_pushed(state)) { 1513 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 1514 return -EBADFD; 1515 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 1516 return -EBADFD; 1517 runtime->trigger_master = substream; 1518 return 0; 1519 } 1520 1521 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, 1522 snd_pcm_state_t state) 1523 { 1524 if (substream->runtime->trigger_master != substream) 1525 return 0; 1526 /* some drivers might use hw_ptr to recover from the pause - 1527 update the hw_ptr now */ 1528 if (pause_pushed(state)) 1529 snd_pcm_update_hw_ptr(substream); 1530 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1531 * a delta between the current jiffies, this gives a large enough 1532 * delta, effectively to skip the check once. 1533 */ 1534 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1535 return substream->ops->trigger(substream, 1536 pause_pushed(state) ? 1537 SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1538 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1539 } 1540 1541 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, 1542 snd_pcm_state_t state) 1543 { 1544 if (substream->runtime->trigger_master == substream) 1545 substream->ops->trigger(substream, 1546 pause_pushed(state) ? 1547 SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1548 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1549 } 1550 1551 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, 1552 snd_pcm_state_t state) 1553 { 1554 struct snd_pcm_runtime *runtime = substream->runtime; 1555 snd_pcm_trigger_tstamp(substream); 1556 if (pause_pushed(state)) { 1557 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1558 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1559 wake_up(&runtime->sleep); 1560 wake_up(&runtime->tsleep); 1561 } else { 1562 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1563 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1564 } 1565 } 1566 1567 static const struct action_ops snd_pcm_action_pause = { 1568 .pre_action = snd_pcm_pre_pause, 1569 .do_action = snd_pcm_do_pause, 1570 .undo_action = snd_pcm_undo_pause, 1571 .post_action = snd_pcm_post_pause 1572 }; 1573 1574 /* 1575 * Push/release the pause for all linked streams. 1576 */ 1577 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push) 1578 { 1579 return snd_pcm_action(&snd_pcm_action_pause, substream, 1580 (__force snd_pcm_state_t)push); 1581 } 1582 1583 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream, 1584 bool push) 1585 { 1586 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream, 1587 (__force snd_pcm_state_t)push); 1588 } 1589 1590 #ifdef CONFIG_PM 1591 /* suspend callback: state argument ignored */ 1592 1593 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, 1594 snd_pcm_state_t state) 1595 { 1596 struct snd_pcm_runtime *runtime = substream->runtime; 1597 switch (runtime->status->state) { 1598 case SNDRV_PCM_STATE_SUSPENDED: 1599 return -EBUSY; 1600 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1601 case SNDRV_PCM_STATE_OPEN: 1602 case SNDRV_PCM_STATE_SETUP: 1603 case SNDRV_PCM_STATE_DISCONNECTED: 1604 return -EBUSY; 1605 } 1606 runtime->trigger_master = substream; 1607 return 0; 1608 } 1609 1610 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, 1611 snd_pcm_state_t state) 1612 { 1613 struct snd_pcm_runtime *runtime = substream->runtime; 1614 if (runtime->trigger_master != substream) 1615 return 0; 1616 if (! snd_pcm_running(substream)) 1617 return 0; 1618 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1619 runtime->stop_operating = true; 1620 return 0; /* suspend unconditionally */ 1621 } 1622 1623 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, 1624 snd_pcm_state_t state) 1625 { 1626 struct snd_pcm_runtime *runtime = substream->runtime; 1627 snd_pcm_trigger_tstamp(substream); 1628 runtime->status->suspended_state = runtime->status->state; 1629 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1630 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1631 wake_up(&runtime->sleep); 1632 wake_up(&runtime->tsleep); 1633 } 1634 1635 static const struct action_ops snd_pcm_action_suspend = { 1636 .pre_action = snd_pcm_pre_suspend, 1637 .do_action = snd_pcm_do_suspend, 1638 .post_action = snd_pcm_post_suspend 1639 }; 1640 1641 /* 1642 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1643 * @substream: the PCM substream 1644 * 1645 * After this call, all streams are changed to SUSPENDED state. 1646 * 1647 * Return: Zero if successful, or a negative error code. 1648 */ 1649 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1650 { 1651 int err; 1652 unsigned long flags; 1653 1654 snd_pcm_stream_lock_irqsave(substream, flags); 1655 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 1656 ACTION_ARG_IGNORE); 1657 snd_pcm_stream_unlock_irqrestore(substream, flags); 1658 return err; 1659 } 1660 1661 /** 1662 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1663 * @pcm: the PCM instance 1664 * 1665 * After this call, all streams are changed to SUSPENDED state. 1666 * 1667 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1668 */ 1669 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1670 { 1671 struct snd_pcm_substream *substream; 1672 int stream, err = 0; 1673 1674 if (! pcm) 1675 return 0; 1676 1677 for_each_pcm_substream(pcm, stream, substream) { 1678 /* FIXME: the open/close code should lock this as well */ 1679 if (!substream->runtime) 1680 continue; 1681 1682 /* 1683 * Skip BE dai link PCM's that are internal and may 1684 * not have their substream ops set. 1685 */ 1686 if (!substream->ops) 1687 continue; 1688 1689 err = snd_pcm_suspend(substream); 1690 if (err < 0 && err != -EBUSY) 1691 return err; 1692 } 1693 1694 for_each_pcm_substream(pcm, stream, substream) 1695 snd_pcm_sync_stop(substream, false); 1696 1697 return 0; 1698 } 1699 EXPORT_SYMBOL(snd_pcm_suspend_all); 1700 1701 /* resume callbacks: state argument ignored */ 1702 1703 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, 1704 snd_pcm_state_t state) 1705 { 1706 struct snd_pcm_runtime *runtime = substream->runtime; 1707 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1708 return -ENOSYS; 1709 runtime->trigger_master = substream; 1710 return 0; 1711 } 1712 1713 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, 1714 snd_pcm_state_t state) 1715 { 1716 struct snd_pcm_runtime *runtime = substream->runtime; 1717 if (runtime->trigger_master != substream) 1718 return 0; 1719 /* DMA not running previously? */ 1720 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1721 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1722 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1723 return 0; 1724 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1725 } 1726 1727 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, 1728 snd_pcm_state_t state) 1729 { 1730 if (substream->runtime->trigger_master == substream && 1731 snd_pcm_running(substream)) 1732 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1733 } 1734 1735 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, 1736 snd_pcm_state_t state) 1737 { 1738 struct snd_pcm_runtime *runtime = substream->runtime; 1739 snd_pcm_trigger_tstamp(substream); 1740 runtime->status->state = runtime->status->suspended_state; 1741 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1742 } 1743 1744 static const struct action_ops snd_pcm_action_resume = { 1745 .pre_action = snd_pcm_pre_resume, 1746 .do_action = snd_pcm_do_resume, 1747 .undo_action = snd_pcm_undo_resume, 1748 .post_action = snd_pcm_post_resume 1749 }; 1750 1751 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1752 { 1753 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 1754 ACTION_ARG_IGNORE); 1755 } 1756 1757 #else 1758 1759 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1760 { 1761 return -ENOSYS; 1762 } 1763 1764 #endif /* CONFIG_PM */ 1765 1766 /* 1767 * xrun ioctl 1768 * 1769 * Change the RUNNING stream(s) to XRUN state. 1770 */ 1771 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1772 { 1773 struct snd_pcm_runtime *runtime = substream->runtime; 1774 int result; 1775 1776 snd_pcm_stream_lock_irq(substream); 1777 switch (runtime->status->state) { 1778 case SNDRV_PCM_STATE_XRUN: 1779 result = 0; /* already there */ 1780 break; 1781 case SNDRV_PCM_STATE_RUNNING: 1782 __snd_pcm_xrun(substream); 1783 result = 0; 1784 break; 1785 default: 1786 result = -EBADFD; 1787 } 1788 snd_pcm_stream_unlock_irq(substream); 1789 return result; 1790 } 1791 1792 /* 1793 * reset ioctl 1794 */ 1795 /* reset callbacks: state argument ignored */ 1796 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, 1797 snd_pcm_state_t state) 1798 { 1799 struct snd_pcm_runtime *runtime = substream->runtime; 1800 switch (runtime->status->state) { 1801 case SNDRV_PCM_STATE_RUNNING: 1802 case SNDRV_PCM_STATE_PREPARED: 1803 case SNDRV_PCM_STATE_PAUSED: 1804 case SNDRV_PCM_STATE_SUSPENDED: 1805 return 0; 1806 default: 1807 return -EBADFD; 1808 } 1809 } 1810 1811 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, 1812 snd_pcm_state_t state) 1813 { 1814 struct snd_pcm_runtime *runtime = substream->runtime; 1815 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1816 if (err < 0) 1817 return err; 1818 runtime->hw_ptr_base = 0; 1819 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1820 runtime->status->hw_ptr % runtime->period_size; 1821 runtime->silence_start = runtime->status->hw_ptr; 1822 runtime->silence_filled = 0; 1823 return 0; 1824 } 1825 1826 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, 1827 snd_pcm_state_t state) 1828 { 1829 struct snd_pcm_runtime *runtime = substream->runtime; 1830 runtime->control->appl_ptr = runtime->status->hw_ptr; 1831 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1832 runtime->silence_size > 0) 1833 snd_pcm_playback_silence(substream, ULONG_MAX); 1834 } 1835 1836 static const struct action_ops snd_pcm_action_reset = { 1837 .pre_action = snd_pcm_pre_reset, 1838 .do_action = snd_pcm_do_reset, 1839 .post_action = snd_pcm_post_reset 1840 }; 1841 1842 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1843 { 1844 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 1845 ACTION_ARG_IGNORE); 1846 } 1847 1848 /* 1849 * prepare ioctl 1850 */ 1851 /* pass f_flags as state argument */ 1852 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1853 snd_pcm_state_t state) 1854 { 1855 struct snd_pcm_runtime *runtime = substream->runtime; 1856 int f_flags = (__force int)state; 1857 1858 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1859 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1860 return -EBADFD; 1861 if (snd_pcm_running(substream)) 1862 return -EBUSY; 1863 substream->f_flags = f_flags; 1864 return 0; 1865 } 1866 1867 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, 1868 snd_pcm_state_t state) 1869 { 1870 int err; 1871 snd_pcm_sync_stop(substream, true); 1872 err = substream->ops->prepare(substream); 1873 if (err < 0) 1874 return err; 1875 return snd_pcm_do_reset(substream, state); 1876 } 1877 1878 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, 1879 snd_pcm_state_t state) 1880 { 1881 struct snd_pcm_runtime *runtime = substream->runtime; 1882 runtime->control->appl_ptr = runtime->status->hw_ptr; 1883 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1884 } 1885 1886 static const struct action_ops snd_pcm_action_prepare = { 1887 .pre_action = snd_pcm_pre_prepare, 1888 .do_action = snd_pcm_do_prepare, 1889 .post_action = snd_pcm_post_prepare 1890 }; 1891 1892 /** 1893 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1894 * @substream: the PCM substream instance 1895 * @file: file to refer f_flags 1896 * 1897 * Return: Zero if successful, or a negative error code. 1898 */ 1899 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1900 struct file *file) 1901 { 1902 int f_flags; 1903 1904 if (file) 1905 f_flags = file->f_flags; 1906 else 1907 f_flags = substream->f_flags; 1908 1909 snd_pcm_stream_lock_irq(substream); 1910 switch (substream->runtime->status->state) { 1911 case SNDRV_PCM_STATE_PAUSED: 1912 snd_pcm_pause(substream, false); 1913 fallthrough; 1914 case SNDRV_PCM_STATE_SUSPENDED: 1915 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1916 break; 1917 } 1918 snd_pcm_stream_unlock_irq(substream); 1919 1920 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1921 substream, 1922 (__force snd_pcm_state_t)f_flags); 1923 } 1924 1925 /* 1926 * drain ioctl 1927 */ 1928 1929 /* drain init callbacks: state argument ignored */ 1930 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, 1931 snd_pcm_state_t state) 1932 { 1933 struct snd_pcm_runtime *runtime = substream->runtime; 1934 switch (runtime->status->state) { 1935 case SNDRV_PCM_STATE_OPEN: 1936 case SNDRV_PCM_STATE_DISCONNECTED: 1937 case SNDRV_PCM_STATE_SUSPENDED: 1938 return -EBADFD; 1939 } 1940 runtime->trigger_master = substream; 1941 return 0; 1942 } 1943 1944 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, 1945 snd_pcm_state_t state) 1946 { 1947 struct snd_pcm_runtime *runtime = substream->runtime; 1948 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1949 switch (runtime->status->state) { 1950 case SNDRV_PCM_STATE_PREPARED: 1951 /* start playback stream if possible */ 1952 if (! snd_pcm_playback_empty(substream)) { 1953 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1954 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1955 } else { 1956 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1957 } 1958 break; 1959 case SNDRV_PCM_STATE_RUNNING: 1960 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1961 break; 1962 case SNDRV_PCM_STATE_XRUN: 1963 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1964 break; 1965 default: 1966 break; 1967 } 1968 } else { 1969 /* stop running stream */ 1970 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1971 snd_pcm_state_t new_state; 1972 1973 new_state = snd_pcm_capture_avail(runtime) > 0 ? 1974 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1975 snd_pcm_do_stop(substream, new_state); 1976 snd_pcm_post_stop(substream, new_state); 1977 } 1978 } 1979 1980 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 1981 runtime->trigger_master == substream && 1982 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 1983 return substream->ops->trigger(substream, 1984 SNDRV_PCM_TRIGGER_DRAIN); 1985 1986 return 0; 1987 } 1988 1989 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, 1990 snd_pcm_state_t state) 1991 { 1992 } 1993 1994 static const struct action_ops snd_pcm_action_drain_init = { 1995 .pre_action = snd_pcm_pre_drain_init, 1996 .do_action = snd_pcm_do_drain_init, 1997 .post_action = snd_pcm_post_drain_init 1998 }; 1999 2000 /* 2001 * Drain the stream(s). 2002 * When the substream is linked, sync until the draining of all playback streams 2003 * is finished. 2004 * After this call, all streams are supposed to be either SETUP or DRAINING 2005 * (capture only) state. 2006 */ 2007 static int snd_pcm_drain(struct snd_pcm_substream *substream, 2008 struct file *file) 2009 { 2010 struct snd_card *card; 2011 struct snd_pcm_runtime *runtime; 2012 struct snd_pcm_substream *s; 2013 struct snd_pcm_group *group; 2014 wait_queue_entry_t wait; 2015 int result = 0; 2016 int nonblock = 0; 2017 2018 card = substream->pcm->card; 2019 runtime = substream->runtime; 2020 2021 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2022 return -EBADFD; 2023 2024 if (file) { 2025 if (file->f_flags & O_NONBLOCK) 2026 nonblock = 1; 2027 } else if (substream->f_flags & O_NONBLOCK) 2028 nonblock = 1; 2029 2030 snd_pcm_stream_lock_irq(substream); 2031 /* resume pause */ 2032 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 2033 snd_pcm_pause(substream, false); 2034 2035 /* pre-start/stop - all running streams are changed to DRAINING state */ 2036 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 2037 ACTION_ARG_IGNORE); 2038 if (result < 0) 2039 goto unlock; 2040 /* in non-blocking, we don't wait in ioctl but let caller poll */ 2041 if (nonblock) { 2042 result = -EAGAIN; 2043 goto unlock; 2044 } 2045 2046 for (;;) { 2047 long tout; 2048 struct snd_pcm_runtime *to_check; 2049 if (signal_pending(current)) { 2050 result = -ERESTARTSYS; 2051 break; 2052 } 2053 /* find a substream to drain */ 2054 to_check = NULL; 2055 group = snd_pcm_stream_group_ref(substream); 2056 snd_pcm_group_for_each_entry(s, substream) { 2057 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 2058 continue; 2059 runtime = s->runtime; 2060 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 2061 to_check = runtime; 2062 break; 2063 } 2064 } 2065 snd_pcm_group_unref(group, substream); 2066 if (!to_check) 2067 break; /* all drained */ 2068 init_waitqueue_entry(&wait, current); 2069 set_current_state(TASK_INTERRUPTIBLE); 2070 add_wait_queue(&to_check->sleep, &wait); 2071 snd_pcm_stream_unlock_irq(substream); 2072 if (runtime->no_period_wakeup) 2073 tout = MAX_SCHEDULE_TIMEOUT; 2074 else { 2075 tout = 10; 2076 if (runtime->rate) { 2077 long t = runtime->period_size * 2 / runtime->rate; 2078 tout = max(t, tout); 2079 } 2080 tout = msecs_to_jiffies(tout * 1000); 2081 } 2082 tout = schedule_timeout(tout); 2083 2084 snd_pcm_stream_lock_irq(substream); 2085 group = snd_pcm_stream_group_ref(substream); 2086 snd_pcm_group_for_each_entry(s, substream) { 2087 if (s->runtime == to_check) { 2088 remove_wait_queue(&to_check->sleep, &wait); 2089 break; 2090 } 2091 } 2092 snd_pcm_group_unref(group, substream); 2093 2094 if (card->shutdown) { 2095 result = -ENODEV; 2096 break; 2097 } 2098 if (tout == 0) { 2099 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 2100 result = -ESTRPIPE; 2101 else { 2102 dev_dbg(substream->pcm->card->dev, 2103 "playback drain error (DMA or IRQ trouble?)\n"); 2104 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2105 result = -EIO; 2106 } 2107 break; 2108 } 2109 } 2110 2111 unlock: 2112 snd_pcm_stream_unlock_irq(substream); 2113 2114 return result; 2115 } 2116 2117 /* 2118 * drop ioctl 2119 * 2120 * Immediately put all linked substreams into SETUP state. 2121 */ 2122 static int snd_pcm_drop(struct snd_pcm_substream *substream) 2123 { 2124 struct snd_pcm_runtime *runtime; 2125 int result = 0; 2126 2127 if (PCM_RUNTIME_CHECK(substream)) 2128 return -ENXIO; 2129 runtime = substream->runtime; 2130 2131 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 2132 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 2133 return -EBADFD; 2134 2135 snd_pcm_stream_lock_irq(substream); 2136 /* resume pause */ 2137 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 2138 snd_pcm_pause(substream, false); 2139 2140 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2141 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 2142 snd_pcm_stream_unlock_irq(substream); 2143 2144 return result; 2145 } 2146 2147 2148 static bool is_pcm_file(struct file *file) 2149 { 2150 struct inode *inode = file_inode(file); 2151 struct snd_pcm *pcm; 2152 unsigned int minor; 2153 2154 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2155 return false; 2156 minor = iminor(inode); 2157 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2158 if (!pcm) 2159 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2160 if (!pcm) 2161 return false; 2162 snd_card_unref(pcm->card); 2163 return true; 2164 } 2165 2166 /* 2167 * PCM link handling 2168 */ 2169 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2170 { 2171 int res = 0; 2172 struct snd_pcm_file *pcm_file; 2173 struct snd_pcm_substream *substream1; 2174 struct snd_pcm_group *group, *target_group; 2175 bool nonatomic = substream->pcm->nonatomic; 2176 struct fd f = fdget(fd); 2177 2178 if (!f.file) 2179 return -EBADFD; 2180 if (!is_pcm_file(f.file)) { 2181 res = -EBADFD; 2182 goto _badf; 2183 } 2184 pcm_file = f.file->private_data; 2185 substream1 = pcm_file->substream; 2186 2187 if (substream == substream1) { 2188 res = -EINVAL; 2189 goto _badf; 2190 } 2191 2192 group = kzalloc(sizeof(*group), GFP_KERNEL); 2193 if (!group) { 2194 res = -ENOMEM; 2195 goto _nolock; 2196 } 2197 snd_pcm_group_init(group); 2198 2199 down_write(&snd_pcm_link_rwsem); 2200 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2201 substream->runtime->status->state != substream1->runtime->status->state || 2202 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2203 res = -EBADFD; 2204 goto _end; 2205 } 2206 if (snd_pcm_stream_linked(substream1)) { 2207 res = -EALREADY; 2208 goto _end; 2209 } 2210 2211 snd_pcm_stream_lock_irq(substream); 2212 if (!snd_pcm_stream_linked(substream)) { 2213 snd_pcm_group_assign(substream, group); 2214 group = NULL; /* assigned, don't free this one below */ 2215 } 2216 target_group = substream->group; 2217 snd_pcm_stream_unlock_irq(substream); 2218 2219 snd_pcm_group_lock_irq(target_group, nonatomic); 2220 snd_pcm_stream_lock_nested(substream1); 2221 snd_pcm_group_assign(substream1, target_group); 2222 refcount_inc(&target_group->refs); 2223 snd_pcm_stream_unlock(substream1); 2224 snd_pcm_group_unlock_irq(target_group, nonatomic); 2225 _end: 2226 up_write(&snd_pcm_link_rwsem); 2227 _nolock: 2228 kfree(group); 2229 _badf: 2230 fdput(f); 2231 return res; 2232 } 2233 2234 static void relink_to_local(struct snd_pcm_substream *substream) 2235 { 2236 snd_pcm_stream_lock_nested(substream); 2237 snd_pcm_group_assign(substream, &substream->self_group); 2238 snd_pcm_stream_unlock(substream); 2239 } 2240 2241 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2242 { 2243 struct snd_pcm_group *group; 2244 bool nonatomic = substream->pcm->nonatomic; 2245 bool do_free = false; 2246 int res = 0; 2247 2248 down_write(&snd_pcm_link_rwsem); 2249 2250 if (!snd_pcm_stream_linked(substream)) { 2251 res = -EALREADY; 2252 goto _end; 2253 } 2254 2255 group = substream->group; 2256 snd_pcm_group_lock_irq(group, nonatomic); 2257 2258 relink_to_local(substream); 2259 refcount_dec(&group->refs); 2260 2261 /* detach the last stream, too */ 2262 if (list_is_singular(&group->substreams)) { 2263 relink_to_local(list_first_entry(&group->substreams, 2264 struct snd_pcm_substream, 2265 link_list)); 2266 do_free = refcount_dec_and_test(&group->refs); 2267 } 2268 2269 snd_pcm_group_unlock_irq(group, nonatomic); 2270 if (do_free) 2271 kfree(group); 2272 2273 _end: 2274 up_write(&snd_pcm_link_rwsem); 2275 return res; 2276 } 2277 2278 /* 2279 * hw configurator 2280 */ 2281 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2282 struct snd_pcm_hw_rule *rule) 2283 { 2284 struct snd_interval t; 2285 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2286 hw_param_interval_c(params, rule->deps[1]), &t); 2287 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2288 } 2289 2290 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2291 struct snd_pcm_hw_rule *rule) 2292 { 2293 struct snd_interval t; 2294 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2295 hw_param_interval_c(params, rule->deps[1]), &t); 2296 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2297 } 2298 2299 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2300 struct snd_pcm_hw_rule *rule) 2301 { 2302 struct snd_interval t; 2303 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2304 hw_param_interval_c(params, rule->deps[1]), 2305 (unsigned long) rule->private, &t); 2306 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2307 } 2308 2309 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2310 struct snd_pcm_hw_rule *rule) 2311 { 2312 struct snd_interval t; 2313 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2314 (unsigned long) rule->private, 2315 hw_param_interval_c(params, rule->deps[1]), &t); 2316 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2317 } 2318 2319 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2320 struct snd_pcm_hw_rule *rule) 2321 { 2322 snd_pcm_format_t k; 2323 const struct snd_interval *i = 2324 hw_param_interval_c(params, rule->deps[0]); 2325 struct snd_mask m; 2326 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2327 snd_mask_any(&m); 2328 pcm_for_each_format(k) { 2329 int bits; 2330 if (!snd_mask_test_format(mask, k)) 2331 continue; 2332 bits = snd_pcm_format_physical_width(k); 2333 if (bits <= 0) 2334 continue; /* ignore invalid formats */ 2335 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2336 snd_mask_reset(&m, (__force unsigned)k); 2337 } 2338 return snd_mask_refine(mask, &m); 2339 } 2340 2341 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2342 struct snd_pcm_hw_rule *rule) 2343 { 2344 struct snd_interval t; 2345 snd_pcm_format_t k; 2346 2347 t.min = UINT_MAX; 2348 t.max = 0; 2349 t.openmin = 0; 2350 t.openmax = 0; 2351 pcm_for_each_format(k) { 2352 int bits; 2353 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2354 continue; 2355 bits = snd_pcm_format_physical_width(k); 2356 if (bits <= 0) 2357 continue; /* ignore invalid formats */ 2358 if (t.min > (unsigned)bits) 2359 t.min = bits; 2360 if (t.max < (unsigned)bits) 2361 t.max = bits; 2362 } 2363 t.integer = 1; 2364 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2365 } 2366 2367 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2368 #error "Change this table" 2369 #endif 2370 2371 static const unsigned int rates[] = { 2372 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2373 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2374 }; 2375 2376 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2377 .count = ARRAY_SIZE(rates), 2378 .list = rates, 2379 }; 2380 2381 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2382 struct snd_pcm_hw_rule *rule) 2383 { 2384 struct snd_pcm_hardware *hw = rule->private; 2385 return snd_interval_list(hw_param_interval(params, rule->var), 2386 snd_pcm_known_rates.count, 2387 snd_pcm_known_rates.list, hw->rates); 2388 } 2389 2390 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2391 struct snd_pcm_hw_rule *rule) 2392 { 2393 struct snd_interval t; 2394 struct snd_pcm_substream *substream = rule->private; 2395 t.min = 0; 2396 t.max = substream->buffer_bytes_max; 2397 t.openmin = 0; 2398 t.openmax = 0; 2399 t.integer = 1; 2400 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2401 } 2402 2403 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2404 { 2405 struct snd_pcm_runtime *runtime = substream->runtime; 2406 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2407 int k, err; 2408 2409 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2410 snd_mask_any(constrs_mask(constrs, k)); 2411 } 2412 2413 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2414 snd_interval_any(constrs_interval(constrs, k)); 2415 } 2416 2417 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2418 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2419 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2420 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2421 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2422 2423 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2424 snd_pcm_hw_rule_format, NULL, 2425 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2426 if (err < 0) 2427 return err; 2428 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2429 snd_pcm_hw_rule_sample_bits, NULL, 2430 SNDRV_PCM_HW_PARAM_FORMAT, 2431 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2432 if (err < 0) 2433 return err; 2434 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2435 snd_pcm_hw_rule_div, NULL, 2436 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2437 if (err < 0) 2438 return err; 2439 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2440 snd_pcm_hw_rule_mul, NULL, 2441 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2442 if (err < 0) 2443 return err; 2444 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2445 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2446 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2447 if (err < 0) 2448 return err; 2449 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2450 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2451 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2452 if (err < 0) 2453 return err; 2454 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2455 snd_pcm_hw_rule_div, NULL, 2456 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2457 if (err < 0) 2458 return err; 2459 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2460 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2461 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2462 if (err < 0) 2463 return err; 2464 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2465 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2466 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2467 if (err < 0) 2468 return err; 2469 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2470 snd_pcm_hw_rule_div, NULL, 2471 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2472 if (err < 0) 2473 return err; 2474 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2475 snd_pcm_hw_rule_div, NULL, 2476 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2477 if (err < 0) 2478 return err; 2479 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2480 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2481 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2482 if (err < 0) 2483 return err; 2484 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2485 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2486 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2487 if (err < 0) 2488 return err; 2489 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2490 snd_pcm_hw_rule_mul, NULL, 2491 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2492 if (err < 0) 2493 return err; 2494 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2495 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2496 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2497 if (err < 0) 2498 return err; 2499 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2500 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2501 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2502 if (err < 0) 2503 return err; 2504 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2505 snd_pcm_hw_rule_muldivk, (void*) 8, 2506 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2507 if (err < 0) 2508 return err; 2509 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2510 snd_pcm_hw_rule_muldivk, (void*) 8, 2511 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2512 if (err < 0) 2513 return err; 2514 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2515 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2516 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2517 if (err < 0) 2518 return err; 2519 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2520 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2521 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2522 if (err < 0) 2523 return err; 2524 return 0; 2525 } 2526 2527 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2528 { 2529 struct snd_pcm_runtime *runtime = substream->runtime; 2530 struct snd_pcm_hardware *hw = &runtime->hw; 2531 int err; 2532 unsigned int mask = 0; 2533 2534 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2535 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED); 2536 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2537 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 2538 if (hw_support_mmap(substream)) { 2539 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2540 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED); 2541 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2542 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED); 2543 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2544 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX); 2545 } 2546 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2547 if (err < 0) 2548 return err; 2549 2550 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2551 if (err < 0) 2552 return err; 2553 2554 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 2555 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD)); 2556 if (err < 0) 2557 return err; 2558 2559 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2560 hw->channels_min, hw->channels_max); 2561 if (err < 0) 2562 return err; 2563 2564 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2565 hw->rate_min, hw->rate_max); 2566 if (err < 0) 2567 return err; 2568 2569 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2570 hw->period_bytes_min, hw->period_bytes_max); 2571 if (err < 0) 2572 return err; 2573 2574 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2575 hw->periods_min, hw->periods_max); 2576 if (err < 0) 2577 return err; 2578 2579 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2580 hw->period_bytes_min, hw->buffer_bytes_max); 2581 if (err < 0) 2582 return err; 2583 2584 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2585 snd_pcm_hw_rule_buffer_bytes_max, substream, 2586 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2587 if (err < 0) 2588 return err; 2589 2590 /* FIXME: remove */ 2591 if (runtime->dma_bytes) { 2592 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2593 if (err < 0) 2594 return err; 2595 } 2596 2597 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2598 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2599 snd_pcm_hw_rule_rate, hw, 2600 SNDRV_PCM_HW_PARAM_RATE, -1); 2601 if (err < 0) 2602 return err; 2603 } 2604 2605 /* FIXME: this belong to lowlevel */ 2606 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2607 2608 return 0; 2609 } 2610 2611 static void pcm_release_private(struct snd_pcm_substream *substream) 2612 { 2613 if (snd_pcm_stream_linked(substream)) 2614 snd_pcm_unlink(substream); 2615 } 2616 2617 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2618 { 2619 substream->ref_count--; 2620 if (substream->ref_count > 0) 2621 return; 2622 2623 snd_pcm_drop(substream); 2624 if (substream->hw_opened) { 2625 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2626 do_hw_free(substream); 2627 substream->ops->close(substream); 2628 substream->hw_opened = 0; 2629 } 2630 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 2631 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 2632 if (substream->pcm_release) { 2633 substream->pcm_release(substream); 2634 substream->pcm_release = NULL; 2635 } 2636 snd_pcm_detach_substream(substream); 2637 } 2638 EXPORT_SYMBOL(snd_pcm_release_substream); 2639 2640 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2641 struct file *file, 2642 struct snd_pcm_substream **rsubstream) 2643 { 2644 struct snd_pcm_substream *substream; 2645 int err; 2646 2647 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2648 if (err < 0) 2649 return err; 2650 if (substream->ref_count > 1) { 2651 *rsubstream = substream; 2652 return 0; 2653 } 2654 2655 err = snd_pcm_hw_constraints_init(substream); 2656 if (err < 0) { 2657 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2658 goto error; 2659 } 2660 2661 if ((err = substream->ops->open(substream)) < 0) 2662 goto error; 2663 2664 substream->hw_opened = 1; 2665 2666 err = snd_pcm_hw_constraints_complete(substream); 2667 if (err < 0) { 2668 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2669 goto error; 2670 } 2671 2672 *rsubstream = substream; 2673 return 0; 2674 2675 error: 2676 snd_pcm_release_substream(substream); 2677 return err; 2678 } 2679 EXPORT_SYMBOL(snd_pcm_open_substream); 2680 2681 static int snd_pcm_open_file(struct file *file, 2682 struct snd_pcm *pcm, 2683 int stream) 2684 { 2685 struct snd_pcm_file *pcm_file; 2686 struct snd_pcm_substream *substream; 2687 int err; 2688 2689 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2690 if (err < 0) 2691 return err; 2692 2693 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2694 if (pcm_file == NULL) { 2695 snd_pcm_release_substream(substream); 2696 return -ENOMEM; 2697 } 2698 pcm_file->substream = substream; 2699 if (substream->ref_count == 1) 2700 substream->pcm_release = pcm_release_private; 2701 file->private_data = pcm_file; 2702 2703 return 0; 2704 } 2705 2706 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2707 { 2708 struct snd_pcm *pcm; 2709 int err = nonseekable_open(inode, file); 2710 if (err < 0) 2711 return err; 2712 pcm = snd_lookup_minor_data(iminor(inode), 2713 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2714 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2715 if (pcm) 2716 snd_card_unref(pcm->card); 2717 return err; 2718 } 2719 2720 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2721 { 2722 struct snd_pcm *pcm; 2723 int err = nonseekable_open(inode, file); 2724 if (err < 0) 2725 return err; 2726 pcm = snd_lookup_minor_data(iminor(inode), 2727 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2728 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2729 if (pcm) 2730 snd_card_unref(pcm->card); 2731 return err; 2732 } 2733 2734 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2735 { 2736 int err; 2737 wait_queue_entry_t wait; 2738 2739 if (pcm == NULL) { 2740 err = -ENODEV; 2741 goto __error1; 2742 } 2743 err = snd_card_file_add(pcm->card, file); 2744 if (err < 0) 2745 goto __error1; 2746 if (!try_module_get(pcm->card->module)) { 2747 err = -EFAULT; 2748 goto __error2; 2749 } 2750 init_waitqueue_entry(&wait, current); 2751 add_wait_queue(&pcm->open_wait, &wait); 2752 mutex_lock(&pcm->open_mutex); 2753 while (1) { 2754 err = snd_pcm_open_file(file, pcm, stream); 2755 if (err >= 0) 2756 break; 2757 if (err == -EAGAIN) { 2758 if (file->f_flags & O_NONBLOCK) { 2759 err = -EBUSY; 2760 break; 2761 } 2762 } else 2763 break; 2764 set_current_state(TASK_INTERRUPTIBLE); 2765 mutex_unlock(&pcm->open_mutex); 2766 schedule(); 2767 mutex_lock(&pcm->open_mutex); 2768 if (pcm->card->shutdown) { 2769 err = -ENODEV; 2770 break; 2771 } 2772 if (signal_pending(current)) { 2773 err = -ERESTARTSYS; 2774 break; 2775 } 2776 } 2777 remove_wait_queue(&pcm->open_wait, &wait); 2778 mutex_unlock(&pcm->open_mutex); 2779 if (err < 0) 2780 goto __error; 2781 return err; 2782 2783 __error: 2784 module_put(pcm->card->module); 2785 __error2: 2786 snd_card_file_remove(pcm->card, file); 2787 __error1: 2788 return err; 2789 } 2790 2791 static int snd_pcm_release(struct inode *inode, struct file *file) 2792 { 2793 struct snd_pcm *pcm; 2794 struct snd_pcm_substream *substream; 2795 struct snd_pcm_file *pcm_file; 2796 2797 pcm_file = file->private_data; 2798 substream = pcm_file->substream; 2799 if (snd_BUG_ON(!substream)) 2800 return -ENXIO; 2801 pcm = substream->pcm; 2802 mutex_lock(&pcm->open_mutex); 2803 snd_pcm_release_substream(substream); 2804 kfree(pcm_file); 2805 mutex_unlock(&pcm->open_mutex); 2806 wake_up(&pcm->open_wait); 2807 module_put(pcm->card->module); 2808 snd_card_file_remove(pcm->card, file); 2809 return 0; 2810 } 2811 2812 /* check and update PCM state; return 0 or a negative error 2813 * call this inside PCM lock 2814 */ 2815 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2816 { 2817 switch (substream->runtime->status->state) { 2818 case SNDRV_PCM_STATE_DRAINING: 2819 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2820 return -EBADFD; 2821 fallthrough; 2822 case SNDRV_PCM_STATE_RUNNING: 2823 return snd_pcm_update_hw_ptr(substream); 2824 case SNDRV_PCM_STATE_PREPARED: 2825 case SNDRV_PCM_STATE_PAUSED: 2826 return 0; 2827 case SNDRV_PCM_STATE_SUSPENDED: 2828 return -ESTRPIPE; 2829 case SNDRV_PCM_STATE_XRUN: 2830 return -EPIPE; 2831 default: 2832 return -EBADFD; 2833 } 2834 } 2835 2836 /* increase the appl_ptr; returns the processed frames or a negative error */ 2837 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2838 snd_pcm_uframes_t frames, 2839 snd_pcm_sframes_t avail) 2840 { 2841 struct snd_pcm_runtime *runtime = substream->runtime; 2842 snd_pcm_sframes_t appl_ptr; 2843 int ret; 2844 2845 if (avail <= 0) 2846 return 0; 2847 if (frames > (snd_pcm_uframes_t)avail) 2848 frames = avail; 2849 appl_ptr = runtime->control->appl_ptr + frames; 2850 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2851 appl_ptr -= runtime->boundary; 2852 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2853 return ret < 0 ? ret : frames; 2854 } 2855 2856 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2857 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2858 snd_pcm_uframes_t frames, 2859 snd_pcm_sframes_t avail) 2860 { 2861 struct snd_pcm_runtime *runtime = substream->runtime; 2862 snd_pcm_sframes_t appl_ptr; 2863 int ret; 2864 2865 if (avail <= 0) 2866 return 0; 2867 if (frames > (snd_pcm_uframes_t)avail) 2868 frames = avail; 2869 appl_ptr = runtime->control->appl_ptr - frames; 2870 if (appl_ptr < 0) 2871 appl_ptr += runtime->boundary; 2872 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2873 /* NOTE: we return zero for errors because PulseAudio gets depressed 2874 * upon receiving an error from rewind ioctl and stops processing 2875 * any longer. Returning zero means that no rewind is done, so 2876 * it's not absolutely wrong to answer like that. 2877 */ 2878 return ret < 0 ? 0 : frames; 2879 } 2880 2881 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2882 snd_pcm_uframes_t frames) 2883 { 2884 snd_pcm_sframes_t ret; 2885 2886 if (frames == 0) 2887 return 0; 2888 2889 snd_pcm_stream_lock_irq(substream); 2890 ret = do_pcm_hwsync(substream); 2891 if (!ret) 2892 ret = rewind_appl_ptr(substream, frames, 2893 snd_pcm_hw_avail(substream)); 2894 snd_pcm_stream_unlock_irq(substream); 2895 return ret; 2896 } 2897 2898 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2899 snd_pcm_uframes_t frames) 2900 { 2901 snd_pcm_sframes_t ret; 2902 2903 if (frames == 0) 2904 return 0; 2905 2906 snd_pcm_stream_lock_irq(substream); 2907 ret = do_pcm_hwsync(substream); 2908 if (!ret) 2909 ret = forward_appl_ptr(substream, frames, 2910 snd_pcm_avail(substream)); 2911 snd_pcm_stream_unlock_irq(substream); 2912 return ret; 2913 } 2914 2915 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2916 { 2917 int err; 2918 2919 snd_pcm_stream_lock_irq(substream); 2920 err = do_pcm_hwsync(substream); 2921 snd_pcm_stream_unlock_irq(substream); 2922 return err; 2923 } 2924 2925 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2926 snd_pcm_sframes_t *delay) 2927 { 2928 int err; 2929 snd_pcm_sframes_t n = 0; 2930 2931 snd_pcm_stream_lock_irq(substream); 2932 err = do_pcm_hwsync(substream); 2933 if (!err) 2934 n = snd_pcm_calc_delay(substream); 2935 snd_pcm_stream_unlock_irq(substream); 2936 if (!err) 2937 *delay = n; 2938 return err; 2939 } 2940 2941 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2942 struct snd_pcm_sync_ptr __user *_sync_ptr) 2943 { 2944 struct snd_pcm_runtime *runtime = substream->runtime; 2945 struct snd_pcm_sync_ptr sync_ptr; 2946 volatile struct snd_pcm_mmap_status *status; 2947 volatile struct snd_pcm_mmap_control *control; 2948 int err; 2949 2950 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2951 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2952 return -EFAULT; 2953 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2954 return -EFAULT; 2955 status = runtime->status; 2956 control = runtime->control; 2957 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2958 err = snd_pcm_hwsync(substream); 2959 if (err < 0) 2960 return err; 2961 } 2962 snd_pcm_stream_lock_irq(substream); 2963 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 2964 err = pcm_lib_apply_appl_ptr(substream, 2965 sync_ptr.c.control.appl_ptr); 2966 if (err < 0) { 2967 snd_pcm_stream_unlock_irq(substream); 2968 return err; 2969 } 2970 } else { 2971 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2972 } 2973 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2974 control->avail_min = sync_ptr.c.control.avail_min; 2975 else 2976 sync_ptr.c.control.avail_min = control->avail_min; 2977 sync_ptr.s.status.state = status->state; 2978 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2979 sync_ptr.s.status.tstamp = status->tstamp; 2980 sync_ptr.s.status.suspended_state = status->suspended_state; 2981 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 2982 snd_pcm_stream_unlock_irq(substream); 2983 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2984 return -EFAULT; 2985 return 0; 2986 } 2987 2988 struct snd_pcm_mmap_status32 { 2989 snd_pcm_state_t state; 2990 s32 pad1; 2991 u32 hw_ptr; 2992 s32 tstamp_sec; 2993 s32 tstamp_nsec; 2994 snd_pcm_state_t suspended_state; 2995 s32 audio_tstamp_sec; 2996 s32 audio_tstamp_nsec; 2997 } __attribute__((packed)); 2998 2999 struct snd_pcm_mmap_control32 { 3000 u32 appl_ptr; 3001 u32 avail_min; 3002 }; 3003 3004 struct snd_pcm_sync_ptr32 { 3005 u32 flags; 3006 union { 3007 struct snd_pcm_mmap_status32 status; 3008 unsigned char reserved[64]; 3009 } s; 3010 union { 3011 struct snd_pcm_mmap_control32 control; 3012 unsigned char reserved[64]; 3013 } c; 3014 } __attribute__((packed)); 3015 3016 /* recalcuate the boundary within 32bit */ 3017 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime) 3018 { 3019 snd_pcm_uframes_t boundary; 3020 3021 if (! runtime->buffer_size) 3022 return 0; 3023 boundary = runtime->buffer_size; 3024 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size) 3025 boundary *= 2; 3026 return boundary; 3027 } 3028 3029 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, 3030 struct snd_pcm_sync_ptr32 __user *src) 3031 { 3032 struct snd_pcm_runtime *runtime = substream->runtime; 3033 volatile struct snd_pcm_mmap_status *status; 3034 volatile struct snd_pcm_mmap_control *control; 3035 u32 sflags; 3036 struct snd_pcm_mmap_control scontrol; 3037 struct snd_pcm_mmap_status sstatus; 3038 snd_pcm_uframes_t boundary; 3039 int err; 3040 3041 if (snd_BUG_ON(!runtime)) 3042 return -EINVAL; 3043 3044 if (get_user(sflags, &src->flags) || 3045 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3046 get_user(scontrol.avail_min, &src->c.control.avail_min)) 3047 return -EFAULT; 3048 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3049 err = snd_pcm_hwsync(substream); 3050 if (err < 0) 3051 return err; 3052 } 3053 status = runtime->status; 3054 control = runtime->control; 3055 boundary = recalculate_boundary(runtime); 3056 if (! boundary) 3057 boundary = 0x7fffffff; 3058 snd_pcm_stream_lock_irq(substream); 3059 /* FIXME: we should consider the boundary for the sync from app */ 3060 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 3061 control->appl_ptr = scontrol.appl_ptr; 3062 else 3063 scontrol.appl_ptr = control->appl_ptr % boundary; 3064 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3065 control->avail_min = scontrol.avail_min; 3066 else 3067 scontrol.avail_min = control->avail_min; 3068 sstatus.state = status->state; 3069 sstatus.hw_ptr = status->hw_ptr % boundary; 3070 sstatus.tstamp = status->tstamp; 3071 sstatus.suspended_state = status->suspended_state; 3072 sstatus.audio_tstamp = status->audio_tstamp; 3073 snd_pcm_stream_unlock_irq(substream); 3074 if (put_user(sstatus.state, &src->s.status.state) || 3075 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || 3076 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) || 3077 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) || 3078 put_user(sstatus.suspended_state, &src->s.status.suspended_state) || 3079 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) || 3080 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) || 3081 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3082 put_user(scontrol.avail_min, &src->c.control.avail_min)) 3083 return -EFAULT; 3084 3085 return 0; 3086 } 3087 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32) 3088 3089 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 3090 { 3091 struct snd_pcm_runtime *runtime = substream->runtime; 3092 int arg; 3093 3094 if (get_user(arg, _arg)) 3095 return -EFAULT; 3096 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 3097 return -EINVAL; 3098 runtime->tstamp_type = arg; 3099 return 0; 3100 } 3101 3102 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 3103 struct snd_xferi __user *_xferi) 3104 { 3105 struct snd_xferi xferi; 3106 struct snd_pcm_runtime *runtime = substream->runtime; 3107 snd_pcm_sframes_t result; 3108 3109 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3110 return -EBADFD; 3111 if (put_user(0, &_xferi->result)) 3112 return -EFAULT; 3113 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 3114 return -EFAULT; 3115 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3116 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 3117 else 3118 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 3119 if (put_user(result, &_xferi->result)) 3120 return -EFAULT; 3121 return result < 0 ? result : 0; 3122 } 3123 3124 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 3125 struct snd_xfern __user *_xfern) 3126 { 3127 struct snd_xfern xfern; 3128 struct snd_pcm_runtime *runtime = substream->runtime; 3129 void *bufs; 3130 snd_pcm_sframes_t result; 3131 3132 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3133 return -EBADFD; 3134 if (runtime->channels > 128) 3135 return -EINVAL; 3136 if (put_user(0, &_xfern->result)) 3137 return -EFAULT; 3138 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 3139 return -EFAULT; 3140 3141 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 3142 if (IS_ERR(bufs)) 3143 return PTR_ERR(bufs); 3144 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3145 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 3146 else 3147 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 3148 kfree(bufs); 3149 if (put_user(result, &_xfern->result)) 3150 return -EFAULT; 3151 return result < 0 ? result : 0; 3152 } 3153 3154 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 3155 snd_pcm_uframes_t __user *_frames) 3156 { 3157 snd_pcm_uframes_t frames; 3158 snd_pcm_sframes_t result; 3159 3160 if (get_user(frames, _frames)) 3161 return -EFAULT; 3162 if (put_user(0, _frames)) 3163 return -EFAULT; 3164 result = snd_pcm_rewind(substream, frames); 3165 if (put_user(result, _frames)) 3166 return -EFAULT; 3167 return result < 0 ? result : 0; 3168 } 3169 3170 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 3171 snd_pcm_uframes_t __user *_frames) 3172 { 3173 snd_pcm_uframes_t frames; 3174 snd_pcm_sframes_t result; 3175 3176 if (get_user(frames, _frames)) 3177 return -EFAULT; 3178 if (put_user(0, _frames)) 3179 return -EFAULT; 3180 result = snd_pcm_forward(substream, frames); 3181 if (put_user(result, _frames)) 3182 return -EFAULT; 3183 return result < 0 ? result : 0; 3184 } 3185 3186 static int snd_pcm_common_ioctl(struct file *file, 3187 struct snd_pcm_substream *substream, 3188 unsigned int cmd, void __user *arg) 3189 { 3190 struct snd_pcm_file *pcm_file = file->private_data; 3191 int res; 3192 3193 if (PCM_RUNTIME_CHECK(substream)) 3194 return -ENXIO; 3195 3196 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); 3197 if (res < 0) 3198 return res; 3199 3200 switch (cmd) { 3201 case SNDRV_PCM_IOCTL_PVERSION: 3202 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 3203 case SNDRV_PCM_IOCTL_INFO: 3204 return snd_pcm_info_user(substream, arg); 3205 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 3206 return 0; 3207 case SNDRV_PCM_IOCTL_TTSTAMP: 3208 return snd_pcm_tstamp(substream, arg); 3209 case SNDRV_PCM_IOCTL_USER_PVERSION: 3210 if (get_user(pcm_file->user_pversion, 3211 (unsigned int __user *)arg)) 3212 return -EFAULT; 3213 return 0; 3214 case SNDRV_PCM_IOCTL_HW_REFINE: 3215 return snd_pcm_hw_refine_user(substream, arg); 3216 case SNDRV_PCM_IOCTL_HW_PARAMS: 3217 return snd_pcm_hw_params_user(substream, arg); 3218 case SNDRV_PCM_IOCTL_HW_FREE: 3219 return snd_pcm_hw_free(substream); 3220 case SNDRV_PCM_IOCTL_SW_PARAMS: 3221 return snd_pcm_sw_params_user(substream, arg); 3222 case SNDRV_PCM_IOCTL_STATUS32: 3223 return snd_pcm_status_user32(substream, arg, false); 3224 case SNDRV_PCM_IOCTL_STATUS_EXT32: 3225 return snd_pcm_status_user32(substream, arg, true); 3226 case SNDRV_PCM_IOCTL_STATUS64: 3227 return snd_pcm_status_user64(substream, arg, false); 3228 case SNDRV_PCM_IOCTL_STATUS_EXT64: 3229 return snd_pcm_status_user64(substream, arg, true); 3230 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 3231 return snd_pcm_channel_info_user(substream, arg); 3232 case SNDRV_PCM_IOCTL_PREPARE: 3233 return snd_pcm_prepare(substream, file); 3234 case SNDRV_PCM_IOCTL_RESET: 3235 return snd_pcm_reset(substream); 3236 case SNDRV_PCM_IOCTL_START: 3237 return snd_pcm_start_lock_irq(substream); 3238 case SNDRV_PCM_IOCTL_LINK: 3239 return snd_pcm_link(substream, (int)(unsigned long) arg); 3240 case SNDRV_PCM_IOCTL_UNLINK: 3241 return snd_pcm_unlink(substream); 3242 case SNDRV_PCM_IOCTL_RESUME: 3243 return snd_pcm_resume(substream); 3244 case SNDRV_PCM_IOCTL_XRUN: 3245 return snd_pcm_xrun(substream); 3246 case SNDRV_PCM_IOCTL_HWSYNC: 3247 return snd_pcm_hwsync(substream); 3248 case SNDRV_PCM_IOCTL_DELAY: 3249 { 3250 snd_pcm_sframes_t delay; 3251 snd_pcm_sframes_t __user *res = arg; 3252 int err; 3253 3254 err = snd_pcm_delay(substream, &delay); 3255 if (err) 3256 return err; 3257 if (put_user(delay, res)) 3258 return -EFAULT; 3259 return 0; 3260 } 3261 case __SNDRV_PCM_IOCTL_SYNC_PTR32: 3262 return snd_pcm_ioctl_sync_ptr_compat(substream, arg); 3263 case __SNDRV_PCM_IOCTL_SYNC_PTR64: 3264 return snd_pcm_sync_ptr(substream, arg); 3265 #ifdef CONFIG_SND_SUPPORT_OLD_API 3266 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 3267 return snd_pcm_hw_refine_old_user(substream, arg); 3268 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 3269 return snd_pcm_hw_params_old_user(substream, arg); 3270 #endif 3271 case SNDRV_PCM_IOCTL_DRAIN: 3272 return snd_pcm_drain(substream, file); 3273 case SNDRV_PCM_IOCTL_DROP: 3274 return snd_pcm_drop(substream); 3275 case SNDRV_PCM_IOCTL_PAUSE: 3276 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg); 3277 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3278 case SNDRV_PCM_IOCTL_READI_FRAMES: 3279 return snd_pcm_xferi_frames_ioctl(substream, arg); 3280 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3281 case SNDRV_PCM_IOCTL_READN_FRAMES: 3282 return snd_pcm_xfern_frames_ioctl(substream, arg); 3283 case SNDRV_PCM_IOCTL_REWIND: 3284 return snd_pcm_rewind_ioctl(substream, arg); 3285 case SNDRV_PCM_IOCTL_FORWARD: 3286 return snd_pcm_forward_ioctl(substream, arg); 3287 } 3288 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3289 return -ENOTTY; 3290 } 3291 3292 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3293 unsigned long arg) 3294 { 3295 struct snd_pcm_file *pcm_file; 3296 3297 pcm_file = file->private_data; 3298 3299 if (((cmd >> 8) & 0xff) != 'A') 3300 return -ENOTTY; 3301 3302 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3303 (void __user *)arg); 3304 } 3305 3306 /** 3307 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3308 * @substream: PCM substream 3309 * @cmd: IOCTL cmd 3310 * @arg: IOCTL argument 3311 * 3312 * The function is provided primarily for OSS layer and USB gadget drivers, 3313 * and it allows only the limited set of ioctls (hw_params, sw_params, 3314 * prepare, start, drain, drop, forward). 3315 */ 3316 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3317 unsigned int cmd, void *arg) 3318 { 3319 snd_pcm_uframes_t *frames = arg; 3320 snd_pcm_sframes_t result; 3321 3322 switch (cmd) { 3323 case SNDRV_PCM_IOCTL_FORWARD: 3324 { 3325 /* provided only for OSS; capture-only and no value returned */ 3326 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3327 return -EINVAL; 3328 result = snd_pcm_forward(substream, *frames); 3329 return result < 0 ? result : 0; 3330 } 3331 case SNDRV_PCM_IOCTL_HW_PARAMS: 3332 return snd_pcm_hw_params(substream, arg); 3333 case SNDRV_PCM_IOCTL_SW_PARAMS: 3334 return snd_pcm_sw_params(substream, arg); 3335 case SNDRV_PCM_IOCTL_PREPARE: 3336 return snd_pcm_prepare(substream, NULL); 3337 case SNDRV_PCM_IOCTL_START: 3338 return snd_pcm_start_lock_irq(substream); 3339 case SNDRV_PCM_IOCTL_DRAIN: 3340 return snd_pcm_drain(substream, NULL); 3341 case SNDRV_PCM_IOCTL_DROP: 3342 return snd_pcm_drop(substream); 3343 case SNDRV_PCM_IOCTL_DELAY: 3344 return snd_pcm_delay(substream, frames); 3345 default: 3346 return -EINVAL; 3347 } 3348 } 3349 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3350 3351 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3352 loff_t * offset) 3353 { 3354 struct snd_pcm_file *pcm_file; 3355 struct snd_pcm_substream *substream; 3356 struct snd_pcm_runtime *runtime; 3357 snd_pcm_sframes_t result; 3358 3359 pcm_file = file->private_data; 3360 substream = pcm_file->substream; 3361 if (PCM_RUNTIME_CHECK(substream)) 3362 return -ENXIO; 3363 runtime = substream->runtime; 3364 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3365 return -EBADFD; 3366 if (!frame_aligned(runtime, count)) 3367 return -EINVAL; 3368 count = bytes_to_frames(runtime, count); 3369 result = snd_pcm_lib_read(substream, buf, count); 3370 if (result > 0) 3371 result = frames_to_bytes(runtime, result); 3372 return result; 3373 } 3374 3375 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3376 size_t count, loff_t * offset) 3377 { 3378 struct snd_pcm_file *pcm_file; 3379 struct snd_pcm_substream *substream; 3380 struct snd_pcm_runtime *runtime; 3381 snd_pcm_sframes_t result; 3382 3383 pcm_file = file->private_data; 3384 substream = pcm_file->substream; 3385 if (PCM_RUNTIME_CHECK(substream)) 3386 return -ENXIO; 3387 runtime = substream->runtime; 3388 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3389 return -EBADFD; 3390 if (!frame_aligned(runtime, count)) 3391 return -EINVAL; 3392 count = bytes_to_frames(runtime, count); 3393 result = snd_pcm_lib_write(substream, buf, count); 3394 if (result > 0) 3395 result = frames_to_bytes(runtime, result); 3396 return result; 3397 } 3398 3399 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3400 { 3401 struct snd_pcm_file *pcm_file; 3402 struct snd_pcm_substream *substream; 3403 struct snd_pcm_runtime *runtime; 3404 snd_pcm_sframes_t result; 3405 unsigned long i; 3406 void __user **bufs; 3407 snd_pcm_uframes_t frames; 3408 3409 pcm_file = iocb->ki_filp->private_data; 3410 substream = pcm_file->substream; 3411 if (PCM_RUNTIME_CHECK(substream)) 3412 return -ENXIO; 3413 runtime = substream->runtime; 3414 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3415 return -EBADFD; 3416 if (!iter_is_iovec(to)) 3417 return -EINVAL; 3418 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3419 return -EINVAL; 3420 if (!frame_aligned(runtime, to->iov->iov_len)) 3421 return -EINVAL; 3422 frames = bytes_to_samples(runtime, to->iov->iov_len); 3423 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3424 if (bufs == NULL) 3425 return -ENOMEM; 3426 for (i = 0; i < to->nr_segs; ++i) 3427 bufs[i] = to->iov[i].iov_base; 3428 result = snd_pcm_lib_readv(substream, bufs, frames); 3429 if (result > 0) 3430 result = frames_to_bytes(runtime, result); 3431 kfree(bufs); 3432 return result; 3433 } 3434 3435 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3436 { 3437 struct snd_pcm_file *pcm_file; 3438 struct snd_pcm_substream *substream; 3439 struct snd_pcm_runtime *runtime; 3440 snd_pcm_sframes_t result; 3441 unsigned long i; 3442 void __user **bufs; 3443 snd_pcm_uframes_t frames; 3444 3445 pcm_file = iocb->ki_filp->private_data; 3446 substream = pcm_file->substream; 3447 if (PCM_RUNTIME_CHECK(substream)) 3448 return -ENXIO; 3449 runtime = substream->runtime; 3450 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3451 return -EBADFD; 3452 if (!iter_is_iovec(from)) 3453 return -EINVAL; 3454 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3455 !frame_aligned(runtime, from->iov->iov_len)) 3456 return -EINVAL; 3457 frames = bytes_to_samples(runtime, from->iov->iov_len); 3458 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3459 if (bufs == NULL) 3460 return -ENOMEM; 3461 for (i = 0; i < from->nr_segs; ++i) 3462 bufs[i] = from->iov[i].iov_base; 3463 result = snd_pcm_lib_writev(substream, bufs, frames); 3464 if (result > 0) 3465 result = frames_to_bytes(runtime, result); 3466 kfree(bufs); 3467 return result; 3468 } 3469 3470 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3471 { 3472 struct snd_pcm_file *pcm_file; 3473 struct snd_pcm_substream *substream; 3474 struct snd_pcm_runtime *runtime; 3475 __poll_t mask, ok; 3476 snd_pcm_uframes_t avail; 3477 3478 pcm_file = file->private_data; 3479 3480 substream = pcm_file->substream; 3481 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3482 ok = EPOLLOUT | EPOLLWRNORM; 3483 else 3484 ok = EPOLLIN | EPOLLRDNORM; 3485 if (PCM_RUNTIME_CHECK(substream)) 3486 return ok | EPOLLERR; 3487 3488 runtime = substream->runtime; 3489 poll_wait(file, &runtime->sleep, wait); 3490 3491 mask = 0; 3492 snd_pcm_stream_lock_irq(substream); 3493 avail = snd_pcm_avail(substream); 3494 switch (runtime->status->state) { 3495 case SNDRV_PCM_STATE_RUNNING: 3496 case SNDRV_PCM_STATE_PREPARED: 3497 case SNDRV_PCM_STATE_PAUSED: 3498 if (avail >= runtime->control->avail_min) 3499 mask = ok; 3500 break; 3501 case SNDRV_PCM_STATE_DRAINING: 3502 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3503 mask = ok; 3504 if (!avail) 3505 mask |= EPOLLERR; 3506 } 3507 break; 3508 default: 3509 mask = ok | EPOLLERR; 3510 break; 3511 } 3512 snd_pcm_stream_unlock_irq(substream); 3513 return mask; 3514 } 3515 3516 /* 3517 * mmap support 3518 */ 3519 3520 /* 3521 * Only on coherent architectures, we can mmap the status and the control records 3522 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3523 */ 3524 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3525 /* 3526 * mmap status record 3527 */ 3528 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3529 { 3530 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3531 struct snd_pcm_runtime *runtime; 3532 3533 if (substream == NULL) 3534 return VM_FAULT_SIGBUS; 3535 runtime = substream->runtime; 3536 vmf->page = virt_to_page(runtime->status); 3537 get_page(vmf->page); 3538 return 0; 3539 } 3540 3541 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3542 { 3543 .fault = snd_pcm_mmap_status_fault, 3544 }; 3545 3546 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3547 struct vm_area_struct *area) 3548 { 3549 long size; 3550 if (!(area->vm_flags & VM_READ)) 3551 return -EINVAL; 3552 size = area->vm_end - area->vm_start; 3553 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3554 return -EINVAL; 3555 area->vm_ops = &snd_pcm_vm_ops_status; 3556 area->vm_private_data = substream; 3557 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3558 return 0; 3559 } 3560 3561 /* 3562 * mmap control record 3563 */ 3564 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3565 { 3566 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3567 struct snd_pcm_runtime *runtime; 3568 3569 if (substream == NULL) 3570 return VM_FAULT_SIGBUS; 3571 runtime = substream->runtime; 3572 vmf->page = virt_to_page(runtime->control); 3573 get_page(vmf->page); 3574 return 0; 3575 } 3576 3577 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3578 { 3579 .fault = snd_pcm_mmap_control_fault, 3580 }; 3581 3582 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3583 struct vm_area_struct *area) 3584 { 3585 long size; 3586 if (!(area->vm_flags & VM_READ)) 3587 return -EINVAL; 3588 size = area->vm_end - area->vm_start; 3589 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3590 return -EINVAL; 3591 area->vm_ops = &snd_pcm_vm_ops_control; 3592 area->vm_private_data = substream; 3593 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3594 return 0; 3595 } 3596 3597 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3598 { 3599 /* See pcm_control_mmap_allowed() below. 3600 * Since older alsa-lib requires both status and control mmaps to be 3601 * coupled, we have to disable the status mmap for old alsa-lib, too. 3602 */ 3603 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3604 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3605 return false; 3606 return true; 3607 } 3608 3609 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3610 { 3611 if (pcm_file->no_compat_mmap) 3612 return false; 3613 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3614 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3615 * thus it effectively assures the manual update of appl_ptr. 3616 */ 3617 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3618 return false; 3619 return true; 3620 } 3621 3622 #else /* ! coherent mmap */ 3623 /* 3624 * don't support mmap for status and control records. 3625 */ 3626 #define pcm_status_mmap_allowed(pcm_file) false 3627 #define pcm_control_mmap_allowed(pcm_file) false 3628 3629 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3630 struct vm_area_struct *area) 3631 { 3632 return -ENXIO; 3633 } 3634 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3635 struct vm_area_struct *area) 3636 { 3637 return -ENXIO; 3638 } 3639 #endif /* coherent mmap */ 3640 3641 static inline struct page * 3642 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3643 { 3644 void *vaddr = substream->runtime->dma_area + ofs; 3645 3646 switch (substream->dma_buffer.dev.type) { 3647 #ifdef CONFIG_SND_DMA_SGBUF 3648 case SNDRV_DMA_TYPE_DEV_SG: 3649 case SNDRV_DMA_TYPE_DEV_UC_SG: 3650 return snd_pcm_sgbuf_ops_page(substream, ofs); 3651 #endif /* CONFIG_SND_DMA_SGBUF */ 3652 case SNDRV_DMA_TYPE_VMALLOC: 3653 return vmalloc_to_page(vaddr); 3654 default: 3655 return virt_to_page(vaddr); 3656 } 3657 } 3658 3659 /* 3660 * fault callback for mmapping a RAM page 3661 */ 3662 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3663 { 3664 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3665 struct snd_pcm_runtime *runtime; 3666 unsigned long offset; 3667 struct page * page; 3668 size_t dma_bytes; 3669 3670 if (substream == NULL) 3671 return VM_FAULT_SIGBUS; 3672 runtime = substream->runtime; 3673 offset = vmf->pgoff << PAGE_SHIFT; 3674 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3675 if (offset > dma_bytes - PAGE_SIZE) 3676 return VM_FAULT_SIGBUS; 3677 if (substream->ops->page) 3678 page = substream->ops->page(substream, offset); 3679 else 3680 page = snd_pcm_default_page_ops(substream, offset); 3681 if (!page) 3682 return VM_FAULT_SIGBUS; 3683 get_page(page); 3684 vmf->page = page; 3685 return 0; 3686 } 3687 3688 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3689 .open = snd_pcm_mmap_data_open, 3690 .close = snd_pcm_mmap_data_close, 3691 }; 3692 3693 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3694 .open = snd_pcm_mmap_data_open, 3695 .close = snd_pcm_mmap_data_close, 3696 .fault = snd_pcm_mmap_data_fault, 3697 }; 3698 3699 /* 3700 * mmap the DMA buffer on RAM 3701 */ 3702 3703 /** 3704 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3705 * @substream: PCM substream 3706 * @area: VMA 3707 * 3708 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3709 * this function is invoked implicitly. 3710 */ 3711 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3712 struct vm_area_struct *area) 3713 { 3714 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3715 #ifdef CONFIG_GENERIC_ALLOCATOR 3716 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3717 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3718 return remap_pfn_range(area, area->vm_start, 3719 substream->dma_buffer.addr >> PAGE_SHIFT, 3720 area->vm_end - area->vm_start, area->vm_page_prot); 3721 } 3722 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3723 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && 3724 (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV || 3725 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_UC)) 3726 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3727 area, 3728 substream->runtime->dma_area, 3729 substream->runtime->dma_addr, 3730 substream->runtime->dma_bytes); 3731 /* mmap with fault handler */ 3732 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3733 return 0; 3734 } 3735 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3736 3737 /* 3738 * mmap the DMA buffer on I/O memory area 3739 */ 3740 #if SNDRV_PCM_INFO_MMAP_IOMEM 3741 /** 3742 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3743 * @substream: PCM substream 3744 * @area: VMA 3745 * 3746 * When your hardware uses the iomapped pages as the hardware buffer and 3747 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3748 * is supposed to work only on limited architectures. 3749 */ 3750 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3751 struct vm_area_struct *area) 3752 { 3753 struct snd_pcm_runtime *runtime = substream->runtime; 3754 3755 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3756 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3757 } 3758 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3759 #endif /* SNDRV_PCM_INFO_MMAP */ 3760 3761 /* 3762 * mmap DMA buffer 3763 */ 3764 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3765 struct vm_area_struct *area) 3766 { 3767 struct snd_pcm_runtime *runtime; 3768 long size; 3769 unsigned long offset; 3770 size_t dma_bytes; 3771 int err; 3772 3773 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3774 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3775 return -EINVAL; 3776 } else { 3777 if (!(area->vm_flags & VM_READ)) 3778 return -EINVAL; 3779 } 3780 runtime = substream->runtime; 3781 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3782 return -EBADFD; 3783 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3784 return -ENXIO; 3785 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3786 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3787 return -EINVAL; 3788 size = area->vm_end - area->vm_start; 3789 offset = area->vm_pgoff << PAGE_SHIFT; 3790 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3791 if ((size_t)size > dma_bytes) 3792 return -EINVAL; 3793 if (offset > dma_bytes - size) 3794 return -EINVAL; 3795 3796 area->vm_ops = &snd_pcm_vm_ops_data; 3797 area->vm_private_data = substream; 3798 if (substream->ops->mmap) 3799 err = substream->ops->mmap(substream, area); 3800 else 3801 err = snd_pcm_lib_default_mmap(substream, area); 3802 if (!err) 3803 atomic_inc(&substream->mmap_count); 3804 return err; 3805 } 3806 EXPORT_SYMBOL(snd_pcm_mmap_data); 3807 3808 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3809 { 3810 struct snd_pcm_file * pcm_file; 3811 struct snd_pcm_substream *substream; 3812 unsigned long offset; 3813 3814 pcm_file = file->private_data; 3815 substream = pcm_file->substream; 3816 if (PCM_RUNTIME_CHECK(substream)) 3817 return -ENXIO; 3818 3819 offset = area->vm_pgoff << PAGE_SHIFT; 3820 switch (offset) { 3821 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD: 3822 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3823 return -ENXIO; 3824 fallthrough; 3825 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 3826 if (!pcm_status_mmap_allowed(pcm_file)) 3827 return -ENXIO; 3828 return snd_pcm_mmap_status(substream, file, area); 3829 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD: 3830 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3831 return -ENXIO; 3832 fallthrough; 3833 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 3834 if (!pcm_control_mmap_allowed(pcm_file)) 3835 return -ENXIO; 3836 return snd_pcm_mmap_control(substream, file, area); 3837 default: 3838 return snd_pcm_mmap_data(substream, file, area); 3839 } 3840 return 0; 3841 } 3842 3843 static int snd_pcm_fasync(int fd, struct file * file, int on) 3844 { 3845 struct snd_pcm_file * pcm_file; 3846 struct snd_pcm_substream *substream; 3847 struct snd_pcm_runtime *runtime; 3848 3849 pcm_file = file->private_data; 3850 substream = pcm_file->substream; 3851 if (PCM_RUNTIME_CHECK(substream)) 3852 return -ENXIO; 3853 runtime = substream->runtime; 3854 return fasync_helper(fd, file, on, &runtime->fasync); 3855 } 3856 3857 /* 3858 * ioctl32 compat 3859 */ 3860 #ifdef CONFIG_COMPAT 3861 #include "pcm_compat.c" 3862 #else 3863 #define snd_pcm_ioctl_compat NULL 3864 #endif 3865 3866 /* 3867 * To be removed helpers to keep binary compatibility 3868 */ 3869 3870 #ifdef CONFIG_SND_SUPPORT_OLD_API 3871 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3872 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3873 3874 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3875 struct snd_pcm_hw_params_old *oparams) 3876 { 3877 unsigned int i; 3878 3879 memset(params, 0, sizeof(*params)); 3880 params->flags = oparams->flags; 3881 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3882 params->masks[i].bits[0] = oparams->masks[i]; 3883 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3884 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3885 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3886 params->info = oparams->info; 3887 params->msbits = oparams->msbits; 3888 params->rate_num = oparams->rate_num; 3889 params->rate_den = oparams->rate_den; 3890 params->fifo_size = oparams->fifo_size; 3891 } 3892 3893 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3894 struct snd_pcm_hw_params *params) 3895 { 3896 unsigned int i; 3897 3898 memset(oparams, 0, sizeof(*oparams)); 3899 oparams->flags = params->flags; 3900 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3901 oparams->masks[i] = params->masks[i].bits[0]; 3902 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3903 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3904 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3905 oparams->info = params->info; 3906 oparams->msbits = params->msbits; 3907 oparams->rate_num = params->rate_num; 3908 oparams->rate_den = params->rate_den; 3909 oparams->fifo_size = params->fifo_size; 3910 } 3911 3912 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3913 struct snd_pcm_hw_params_old __user * _oparams) 3914 { 3915 struct snd_pcm_hw_params *params; 3916 struct snd_pcm_hw_params_old *oparams = NULL; 3917 int err; 3918 3919 params = kmalloc(sizeof(*params), GFP_KERNEL); 3920 if (!params) 3921 return -ENOMEM; 3922 3923 oparams = memdup_user(_oparams, sizeof(*oparams)); 3924 if (IS_ERR(oparams)) { 3925 err = PTR_ERR(oparams); 3926 goto out; 3927 } 3928 snd_pcm_hw_convert_from_old_params(params, oparams); 3929 err = snd_pcm_hw_refine(substream, params); 3930 if (err < 0) 3931 goto out_old; 3932 3933 err = fixup_unreferenced_params(substream, params); 3934 if (err < 0) 3935 goto out_old; 3936 3937 snd_pcm_hw_convert_to_old_params(oparams, params); 3938 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3939 err = -EFAULT; 3940 out_old: 3941 kfree(oparams); 3942 out: 3943 kfree(params); 3944 return err; 3945 } 3946 3947 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3948 struct snd_pcm_hw_params_old __user * _oparams) 3949 { 3950 struct snd_pcm_hw_params *params; 3951 struct snd_pcm_hw_params_old *oparams = NULL; 3952 int err; 3953 3954 params = kmalloc(sizeof(*params), GFP_KERNEL); 3955 if (!params) 3956 return -ENOMEM; 3957 3958 oparams = memdup_user(_oparams, sizeof(*oparams)); 3959 if (IS_ERR(oparams)) { 3960 err = PTR_ERR(oparams); 3961 goto out; 3962 } 3963 3964 snd_pcm_hw_convert_from_old_params(params, oparams); 3965 err = snd_pcm_hw_params(substream, params); 3966 if (err < 0) 3967 goto out_old; 3968 3969 snd_pcm_hw_convert_to_old_params(oparams, params); 3970 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 3971 err = -EFAULT; 3972 out_old: 3973 kfree(oparams); 3974 out: 3975 kfree(params); 3976 return err; 3977 } 3978 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3979 3980 #ifndef CONFIG_MMU 3981 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3982 unsigned long addr, 3983 unsigned long len, 3984 unsigned long pgoff, 3985 unsigned long flags) 3986 { 3987 struct snd_pcm_file *pcm_file = file->private_data; 3988 struct snd_pcm_substream *substream = pcm_file->substream; 3989 struct snd_pcm_runtime *runtime = substream->runtime; 3990 unsigned long offset = pgoff << PAGE_SHIFT; 3991 3992 switch (offset) { 3993 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 3994 return (unsigned long)runtime->status; 3995 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 3996 return (unsigned long)runtime->control; 3997 default: 3998 return (unsigned long)runtime->dma_area + offset; 3999 } 4000 } 4001 #else 4002 # define snd_pcm_get_unmapped_area NULL 4003 #endif 4004 4005 /* 4006 * Register section 4007 */ 4008 4009 const struct file_operations snd_pcm_f_ops[2] = { 4010 { 4011 .owner = THIS_MODULE, 4012 .write = snd_pcm_write, 4013 .write_iter = snd_pcm_writev, 4014 .open = snd_pcm_playback_open, 4015 .release = snd_pcm_release, 4016 .llseek = no_llseek, 4017 .poll = snd_pcm_poll, 4018 .unlocked_ioctl = snd_pcm_ioctl, 4019 .compat_ioctl = snd_pcm_ioctl_compat, 4020 .mmap = snd_pcm_mmap, 4021 .fasync = snd_pcm_fasync, 4022 .get_unmapped_area = snd_pcm_get_unmapped_area, 4023 }, 4024 { 4025 .owner = THIS_MODULE, 4026 .read = snd_pcm_read, 4027 .read_iter = snd_pcm_readv, 4028 .open = snd_pcm_capture_open, 4029 .release = snd_pcm_release, 4030 .llseek = no_llseek, 4031 .poll = snd_pcm_poll, 4032 .unlocked_ioctl = snd_pcm_ioctl, 4033 .compat_ioctl = snd_pcm_ioctl_compat, 4034 .mmap = snd_pcm_mmap, 4035 .fasync = snd_pcm_fasync, 4036 .get_unmapped_area = snd_pcm_get_unmapped_area, 4037 } 4038 }; 4039