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