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