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