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