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->state != SNDRV_PCM_STATE_DISCONNECTED) 599 __snd_pcm_set_state(substream->runtime, 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 /* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise 689 * block the further r/w operations 690 */ 691 static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime) 692 { 693 if (!atomic_dec_unless_positive(&runtime->buffer_accessing)) 694 return -EBUSY; 695 mutex_lock(&runtime->buffer_mutex); 696 return 0; /* keep buffer_mutex, unlocked by below */ 697 } 698 699 /* release buffer_mutex and clear r/w access flag */ 700 static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime) 701 { 702 mutex_unlock(&runtime->buffer_mutex); 703 atomic_inc(&runtime->buffer_accessing); 704 } 705 706 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 707 #define is_oss_stream(substream) ((substream)->oss.oss) 708 #else 709 #define is_oss_stream(substream) false 710 #endif 711 712 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 713 struct snd_pcm_hw_params *params) 714 { 715 struct snd_pcm_runtime *runtime; 716 int err, usecs; 717 unsigned int bits; 718 snd_pcm_uframes_t frames; 719 720 if (PCM_RUNTIME_CHECK(substream)) 721 return -ENXIO; 722 runtime = substream->runtime; 723 err = snd_pcm_buffer_access_lock(runtime); 724 if (err < 0) 725 return err; 726 snd_pcm_stream_lock_irq(substream); 727 switch (runtime->state) { 728 case SNDRV_PCM_STATE_OPEN: 729 case SNDRV_PCM_STATE_SETUP: 730 case SNDRV_PCM_STATE_PREPARED: 731 if (!is_oss_stream(substream) && 732 atomic_read(&substream->mmap_count)) 733 err = -EBADFD; 734 break; 735 default: 736 err = -EBADFD; 737 break; 738 } 739 snd_pcm_stream_unlock_irq(substream); 740 if (err) 741 goto unlock; 742 743 snd_pcm_sync_stop(substream, true); 744 745 params->rmask = ~0U; 746 err = snd_pcm_hw_refine(substream, params); 747 if (err < 0) 748 goto _error; 749 750 err = snd_pcm_hw_params_choose(substream, params); 751 if (err < 0) 752 goto _error; 753 754 err = fixup_unreferenced_params(substream, params); 755 if (err < 0) 756 goto _error; 757 758 if (substream->managed_buffer_alloc) { 759 err = snd_pcm_lib_malloc_pages(substream, 760 params_buffer_bytes(params)); 761 if (err < 0) 762 goto _error; 763 runtime->buffer_changed = err > 0; 764 } 765 766 if (substream->ops->hw_params != NULL) { 767 err = substream->ops->hw_params(substream, params); 768 if (err < 0) 769 goto _error; 770 } 771 772 runtime->access = params_access(params); 773 runtime->format = params_format(params); 774 runtime->subformat = params_subformat(params); 775 runtime->channels = params_channels(params); 776 runtime->rate = params_rate(params); 777 runtime->period_size = params_period_size(params); 778 runtime->periods = params_periods(params); 779 runtime->buffer_size = params_buffer_size(params); 780 runtime->info = params->info; 781 runtime->rate_num = params->rate_num; 782 runtime->rate_den = params->rate_den; 783 runtime->no_period_wakeup = 784 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 785 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 786 787 bits = snd_pcm_format_physical_width(runtime->format); 788 runtime->sample_bits = bits; 789 bits *= runtime->channels; 790 runtime->frame_bits = bits; 791 frames = 1; 792 while (bits % 8 != 0) { 793 bits *= 2; 794 frames *= 2; 795 } 796 runtime->byte_align = bits / 8; 797 runtime->min_align = frames; 798 799 /* Default sw params */ 800 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 801 runtime->period_step = 1; 802 runtime->control->avail_min = runtime->period_size; 803 runtime->start_threshold = 1; 804 runtime->stop_threshold = runtime->buffer_size; 805 runtime->silence_threshold = 0; 806 runtime->silence_size = 0; 807 runtime->boundary = runtime->buffer_size; 808 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 809 runtime->boundary *= 2; 810 811 /* clear the buffer for avoiding possible kernel info leaks */ 812 if (runtime->dma_area && !substream->ops->copy_user) { 813 size_t size = runtime->dma_bytes; 814 815 if (runtime->info & SNDRV_PCM_INFO_MMAP) 816 size = PAGE_ALIGN(size); 817 memset(runtime->dma_area, 0, size); 818 } 819 820 snd_pcm_timer_resolution_change(substream); 821 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 822 823 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 824 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 825 usecs = period_to_usecs(runtime); 826 if (usecs >= 0) 827 cpu_latency_qos_add_request(&substream->latency_pm_qos_req, 828 usecs); 829 err = 0; 830 _error: 831 if (err) { 832 /* hardware might be unusable from this time, 833 * so we force application to retry to set 834 * the correct hardware parameter settings 835 */ 836 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 837 if (substream->ops->hw_free != NULL) 838 substream->ops->hw_free(substream); 839 if (substream->managed_buffer_alloc) 840 snd_pcm_lib_free_pages(substream); 841 } 842 unlock: 843 snd_pcm_buffer_access_unlock(runtime); 844 return err; 845 } 846 847 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 848 struct snd_pcm_hw_params __user * _params) 849 { 850 struct snd_pcm_hw_params *params; 851 int err; 852 853 params = memdup_user(_params, sizeof(*params)); 854 if (IS_ERR(params)) 855 return PTR_ERR(params); 856 857 err = snd_pcm_hw_params(substream, params); 858 if (err < 0) 859 goto end; 860 861 if (copy_to_user(_params, params, sizeof(*params))) 862 err = -EFAULT; 863 end: 864 kfree(params); 865 return err; 866 } 867 868 static int do_hw_free(struct snd_pcm_substream *substream) 869 { 870 int result = 0; 871 872 snd_pcm_sync_stop(substream, true); 873 if (substream->ops->hw_free) 874 result = substream->ops->hw_free(substream); 875 if (substream->managed_buffer_alloc) 876 snd_pcm_lib_free_pages(substream); 877 return result; 878 } 879 880 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 881 { 882 struct snd_pcm_runtime *runtime; 883 int result = 0; 884 885 if (PCM_RUNTIME_CHECK(substream)) 886 return -ENXIO; 887 runtime = substream->runtime; 888 result = snd_pcm_buffer_access_lock(runtime); 889 if (result < 0) 890 return result; 891 snd_pcm_stream_lock_irq(substream); 892 switch (runtime->state) { 893 case SNDRV_PCM_STATE_SETUP: 894 case SNDRV_PCM_STATE_PREPARED: 895 if (atomic_read(&substream->mmap_count)) 896 result = -EBADFD; 897 break; 898 default: 899 result = -EBADFD; 900 break; 901 } 902 snd_pcm_stream_unlock_irq(substream); 903 if (result) 904 goto unlock; 905 result = do_hw_free(substream); 906 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 907 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 908 unlock: 909 snd_pcm_buffer_access_unlock(runtime); 910 return result; 911 } 912 913 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 914 struct snd_pcm_sw_params *params) 915 { 916 struct snd_pcm_runtime *runtime; 917 int err; 918 919 if (PCM_RUNTIME_CHECK(substream)) 920 return -ENXIO; 921 runtime = substream->runtime; 922 snd_pcm_stream_lock_irq(substream); 923 if (runtime->state == SNDRV_PCM_STATE_OPEN) { 924 snd_pcm_stream_unlock_irq(substream); 925 return -EBADFD; 926 } 927 snd_pcm_stream_unlock_irq(substream); 928 929 if (params->tstamp_mode < 0 || 930 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 931 return -EINVAL; 932 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 933 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 934 return -EINVAL; 935 if (params->avail_min == 0) 936 return -EINVAL; 937 if (params->silence_size >= runtime->boundary) { 938 if (params->silence_threshold != 0) 939 return -EINVAL; 940 } else { 941 if (params->silence_size > params->silence_threshold) 942 return -EINVAL; 943 if (params->silence_threshold > runtime->buffer_size) 944 return -EINVAL; 945 } 946 err = 0; 947 snd_pcm_stream_lock_irq(substream); 948 runtime->tstamp_mode = params->tstamp_mode; 949 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 950 runtime->tstamp_type = params->tstamp_type; 951 runtime->period_step = params->period_step; 952 runtime->control->avail_min = params->avail_min; 953 runtime->start_threshold = params->start_threshold; 954 runtime->stop_threshold = params->stop_threshold; 955 runtime->silence_threshold = params->silence_threshold; 956 runtime->silence_size = params->silence_size; 957 params->boundary = runtime->boundary; 958 if (snd_pcm_running(substream)) { 959 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 960 runtime->silence_size > 0) 961 snd_pcm_playback_silence(substream, ULONG_MAX); 962 err = snd_pcm_update_state(substream, runtime); 963 } 964 snd_pcm_stream_unlock_irq(substream); 965 return err; 966 } 967 968 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 969 struct snd_pcm_sw_params __user * _params) 970 { 971 struct snd_pcm_sw_params params; 972 int err; 973 if (copy_from_user(¶ms, _params, sizeof(params))) 974 return -EFAULT; 975 err = snd_pcm_sw_params(substream, ¶ms); 976 if (copy_to_user(_params, ¶ms, sizeof(params))) 977 return -EFAULT; 978 return err; 979 } 980 981 static inline snd_pcm_uframes_t 982 snd_pcm_calc_delay(struct snd_pcm_substream *substream) 983 { 984 snd_pcm_uframes_t delay; 985 986 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 987 delay = snd_pcm_playback_hw_avail(substream->runtime); 988 else 989 delay = snd_pcm_capture_avail(substream->runtime); 990 return delay + substream->runtime->delay; 991 } 992 993 int snd_pcm_status64(struct snd_pcm_substream *substream, 994 struct snd_pcm_status64 *status) 995 { 996 struct snd_pcm_runtime *runtime = substream->runtime; 997 998 snd_pcm_stream_lock_irq(substream); 999 1000 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, 1001 &runtime->audio_tstamp_config); 1002 1003 /* backwards compatible behavior */ 1004 if (runtime->audio_tstamp_config.type_requested == 1005 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { 1006 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) 1007 runtime->audio_tstamp_config.type_requested = 1008 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; 1009 else 1010 runtime->audio_tstamp_config.type_requested = 1011 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; 1012 runtime->audio_tstamp_report.valid = 0; 1013 } else 1014 runtime->audio_tstamp_report.valid = 1; 1015 1016 status->state = runtime->state; 1017 status->suspended_state = runtime->suspended_state; 1018 if (status->state == SNDRV_PCM_STATE_OPEN) 1019 goto _end; 1020 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec; 1021 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec; 1022 if (snd_pcm_running(substream)) { 1023 snd_pcm_update_hw_ptr(substream); 1024 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 1025 status->tstamp_sec = runtime->status->tstamp.tv_sec; 1026 status->tstamp_nsec = 1027 runtime->status->tstamp.tv_nsec; 1028 status->driver_tstamp_sec = 1029 runtime->driver_tstamp.tv_sec; 1030 status->driver_tstamp_nsec = 1031 runtime->driver_tstamp.tv_nsec; 1032 status->audio_tstamp_sec = 1033 runtime->status->audio_tstamp.tv_sec; 1034 status->audio_tstamp_nsec = 1035 runtime->status->audio_tstamp.tv_nsec; 1036 if (runtime->audio_tstamp_report.valid == 1) 1037 /* backwards compatibility, no report provided in COMPAT mode */ 1038 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, 1039 &status->audio_tstamp_accuracy, 1040 &runtime->audio_tstamp_report); 1041 1042 goto _tstamp_end; 1043 } 1044 } else { 1045 /* get tstamp only in fallback mode and only if enabled */ 1046 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 1047 struct timespec64 tstamp; 1048 1049 snd_pcm_gettime(runtime, &tstamp); 1050 status->tstamp_sec = tstamp.tv_sec; 1051 status->tstamp_nsec = tstamp.tv_nsec; 1052 } 1053 } 1054 _tstamp_end: 1055 status->appl_ptr = runtime->control->appl_ptr; 1056 status->hw_ptr = runtime->status->hw_ptr; 1057 status->avail = snd_pcm_avail(substream); 1058 status->delay = snd_pcm_running(substream) ? 1059 snd_pcm_calc_delay(substream) : 0; 1060 status->avail_max = runtime->avail_max; 1061 status->overrange = runtime->overrange; 1062 runtime->avail_max = 0; 1063 runtime->overrange = 0; 1064 _end: 1065 snd_pcm_stream_unlock_irq(substream); 1066 return 0; 1067 } 1068 1069 static int snd_pcm_status_user64(struct snd_pcm_substream *substream, 1070 struct snd_pcm_status64 __user * _status, 1071 bool ext) 1072 { 1073 struct snd_pcm_status64 status; 1074 int res; 1075 1076 memset(&status, 0, sizeof(status)); 1077 /* 1078 * with extension, parameters are read/write, 1079 * get audio_tstamp_data from user, 1080 * ignore rest of status structure 1081 */ 1082 if (ext && get_user(status.audio_tstamp_data, 1083 (u32 __user *)(&_status->audio_tstamp_data))) 1084 return -EFAULT; 1085 res = snd_pcm_status64(substream, &status); 1086 if (res < 0) 1087 return res; 1088 if (copy_to_user(_status, &status, sizeof(status))) 1089 return -EFAULT; 1090 return 0; 1091 } 1092 1093 static int snd_pcm_status_user32(struct snd_pcm_substream *substream, 1094 struct snd_pcm_status32 __user * _status, 1095 bool ext) 1096 { 1097 struct snd_pcm_status64 status64; 1098 struct snd_pcm_status32 status32; 1099 int res; 1100 1101 memset(&status64, 0, sizeof(status64)); 1102 memset(&status32, 0, sizeof(status32)); 1103 /* 1104 * with extension, parameters are read/write, 1105 * get audio_tstamp_data from user, 1106 * ignore rest of status structure 1107 */ 1108 if (ext && get_user(status64.audio_tstamp_data, 1109 (u32 __user *)(&_status->audio_tstamp_data))) 1110 return -EFAULT; 1111 res = snd_pcm_status64(substream, &status64); 1112 if (res < 0) 1113 return res; 1114 1115 status32 = (struct snd_pcm_status32) { 1116 .state = status64.state, 1117 .trigger_tstamp_sec = status64.trigger_tstamp_sec, 1118 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec, 1119 .tstamp_sec = status64.tstamp_sec, 1120 .tstamp_nsec = status64.tstamp_nsec, 1121 .appl_ptr = status64.appl_ptr, 1122 .hw_ptr = status64.hw_ptr, 1123 .delay = status64.delay, 1124 .avail = status64.avail, 1125 .avail_max = status64.avail_max, 1126 .overrange = status64.overrange, 1127 .suspended_state = status64.suspended_state, 1128 .audio_tstamp_data = status64.audio_tstamp_data, 1129 .audio_tstamp_sec = status64.audio_tstamp_sec, 1130 .audio_tstamp_nsec = status64.audio_tstamp_nsec, 1131 .driver_tstamp_sec = status64.audio_tstamp_sec, 1132 .driver_tstamp_nsec = status64.audio_tstamp_nsec, 1133 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy, 1134 }; 1135 1136 if (copy_to_user(_status, &status32, sizeof(status32))) 1137 return -EFAULT; 1138 1139 return 0; 1140 } 1141 1142 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 1143 struct snd_pcm_channel_info * info) 1144 { 1145 struct snd_pcm_runtime *runtime; 1146 unsigned int channel; 1147 1148 channel = info->channel; 1149 runtime = substream->runtime; 1150 snd_pcm_stream_lock_irq(substream); 1151 if (runtime->state == SNDRV_PCM_STATE_OPEN) { 1152 snd_pcm_stream_unlock_irq(substream); 1153 return -EBADFD; 1154 } 1155 snd_pcm_stream_unlock_irq(substream); 1156 if (channel >= runtime->channels) 1157 return -EINVAL; 1158 memset(info, 0, sizeof(*info)); 1159 info->channel = channel; 1160 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 1161 } 1162 1163 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 1164 struct snd_pcm_channel_info __user * _info) 1165 { 1166 struct snd_pcm_channel_info info; 1167 int res; 1168 1169 if (copy_from_user(&info, _info, sizeof(info))) 1170 return -EFAULT; 1171 res = snd_pcm_channel_info(substream, &info); 1172 if (res < 0) 1173 return res; 1174 if (copy_to_user(_info, &info, sizeof(info))) 1175 return -EFAULT; 1176 return 0; 1177 } 1178 1179 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 1180 { 1181 struct snd_pcm_runtime *runtime = substream->runtime; 1182 if (runtime->trigger_master == NULL) 1183 return; 1184 if (runtime->trigger_master == substream) { 1185 if (!runtime->trigger_tstamp_latched) 1186 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1187 } else { 1188 snd_pcm_trigger_tstamp(runtime->trigger_master); 1189 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 1190 } 1191 runtime->trigger_master = NULL; 1192 } 1193 1194 #define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0 1195 1196 struct action_ops { 1197 int (*pre_action)(struct snd_pcm_substream *substream, 1198 snd_pcm_state_t state); 1199 int (*do_action)(struct snd_pcm_substream *substream, 1200 snd_pcm_state_t state); 1201 void (*undo_action)(struct snd_pcm_substream *substream, 1202 snd_pcm_state_t state); 1203 void (*post_action)(struct snd_pcm_substream *substream, 1204 snd_pcm_state_t state); 1205 }; 1206 1207 /* 1208 * this functions is core for handling of linked stream 1209 * Note: the stream state might be changed also on failure 1210 * Note2: call with calling stream lock + link lock 1211 */ 1212 static int snd_pcm_action_group(const struct action_ops *ops, 1213 struct snd_pcm_substream *substream, 1214 snd_pcm_state_t state, 1215 bool stream_lock) 1216 { 1217 struct snd_pcm_substream *s = NULL; 1218 struct snd_pcm_substream *s1; 1219 int res = 0, depth = 1; 1220 1221 snd_pcm_group_for_each_entry(s, substream) { 1222 if (s != substream) { 1223 if (!stream_lock) 1224 mutex_lock_nested(&s->runtime->buffer_mutex, depth); 1225 else if (s->pcm->nonatomic) 1226 mutex_lock_nested(&s->self_group.mutex, depth); 1227 else 1228 spin_lock_nested(&s->self_group.lock, depth); 1229 depth++; 1230 } 1231 res = ops->pre_action(s, state); 1232 if (res < 0) 1233 goto _unlock; 1234 } 1235 snd_pcm_group_for_each_entry(s, substream) { 1236 res = ops->do_action(s, state); 1237 if (res < 0) { 1238 if (ops->undo_action) { 1239 snd_pcm_group_for_each_entry(s1, substream) { 1240 if (s1 == s) /* failed stream */ 1241 break; 1242 ops->undo_action(s1, state); 1243 } 1244 } 1245 s = NULL; /* unlock all */ 1246 goto _unlock; 1247 } 1248 } 1249 snd_pcm_group_for_each_entry(s, substream) { 1250 ops->post_action(s, state); 1251 } 1252 _unlock: 1253 /* unlock streams */ 1254 snd_pcm_group_for_each_entry(s1, substream) { 1255 if (s1 != substream) { 1256 if (!stream_lock) 1257 mutex_unlock(&s1->runtime->buffer_mutex); 1258 else if (s1->pcm->nonatomic) 1259 mutex_unlock(&s1->self_group.mutex); 1260 else 1261 spin_unlock(&s1->self_group.lock); 1262 } 1263 if (s1 == s) /* end */ 1264 break; 1265 } 1266 return res; 1267 } 1268 1269 /* 1270 * Note: call with stream lock 1271 */ 1272 static int snd_pcm_action_single(const struct action_ops *ops, 1273 struct snd_pcm_substream *substream, 1274 snd_pcm_state_t state) 1275 { 1276 int res; 1277 1278 res = ops->pre_action(substream, state); 1279 if (res < 0) 1280 return res; 1281 res = ops->do_action(substream, state); 1282 if (res == 0) 1283 ops->post_action(substream, state); 1284 else if (ops->undo_action) 1285 ops->undo_action(substream, state); 1286 return res; 1287 } 1288 1289 static void snd_pcm_group_assign(struct snd_pcm_substream *substream, 1290 struct snd_pcm_group *new_group) 1291 { 1292 substream->group = new_group; 1293 list_move(&substream->link_list, &new_group->substreams); 1294 } 1295 1296 /* 1297 * Unref and unlock the group, but keep the stream lock; 1298 * when the group becomes empty and no longer referred, destroy itself 1299 */ 1300 static void snd_pcm_group_unref(struct snd_pcm_group *group, 1301 struct snd_pcm_substream *substream) 1302 { 1303 bool do_free; 1304 1305 if (!group) 1306 return; 1307 do_free = refcount_dec_and_test(&group->refs); 1308 snd_pcm_group_unlock(group, substream->pcm->nonatomic); 1309 if (do_free) 1310 kfree(group); 1311 } 1312 1313 /* 1314 * Lock the group inside a stream lock and reference it; 1315 * return the locked group object, or NULL if not linked 1316 */ 1317 static struct snd_pcm_group * 1318 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) 1319 { 1320 bool nonatomic = substream->pcm->nonatomic; 1321 struct snd_pcm_group *group; 1322 bool trylock; 1323 1324 for (;;) { 1325 if (!snd_pcm_stream_linked(substream)) 1326 return NULL; 1327 group = substream->group; 1328 /* block freeing the group object */ 1329 refcount_inc(&group->refs); 1330 1331 trylock = nonatomic ? mutex_trylock(&group->mutex) : 1332 spin_trylock(&group->lock); 1333 if (trylock) 1334 break; /* OK */ 1335 1336 /* re-lock for avoiding ABBA deadlock */ 1337 snd_pcm_stream_unlock(substream); 1338 snd_pcm_group_lock(group, nonatomic); 1339 snd_pcm_stream_lock(substream); 1340 1341 /* check the group again; the above opens a small race window */ 1342 if (substream->group == group) 1343 break; /* OK */ 1344 /* group changed, try again */ 1345 snd_pcm_group_unref(group, substream); 1346 } 1347 return group; 1348 } 1349 1350 /* 1351 * Note: call with stream lock 1352 */ 1353 static int snd_pcm_action(const struct action_ops *ops, 1354 struct snd_pcm_substream *substream, 1355 snd_pcm_state_t state) 1356 { 1357 struct snd_pcm_group *group; 1358 int res; 1359 1360 group = snd_pcm_stream_group_ref(substream); 1361 if (group) 1362 res = snd_pcm_action_group(ops, substream, state, true); 1363 else 1364 res = snd_pcm_action_single(ops, substream, state); 1365 snd_pcm_group_unref(group, substream); 1366 return res; 1367 } 1368 1369 /* 1370 * Note: don't use any locks before 1371 */ 1372 static int snd_pcm_action_lock_irq(const struct action_ops *ops, 1373 struct snd_pcm_substream *substream, 1374 snd_pcm_state_t state) 1375 { 1376 int res; 1377 1378 snd_pcm_stream_lock_irq(substream); 1379 res = snd_pcm_action(ops, substream, state); 1380 snd_pcm_stream_unlock_irq(substream); 1381 return res; 1382 } 1383 1384 /* 1385 */ 1386 static int snd_pcm_action_nonatomic(const struct action_ops *ops, 1387 struct snd_pcm_substream *substream, 1388 snd_pcm_state_t state) 1389 { 1390 int res; 1391 1392 /* Guarantee the group members won't change during non-atomic action */ 1393 down_read(&snd_pcm_link_rwsem); 1394 res = snd_pcm_buffer_access_lock(substream->runtime); 1395 if (res < 0) 1396 goto unlock; 1397 if (snd_pcm_stream_linked(substream)) 1398 res = snd_pcm_action_group(ops, substream, state, false); 1399 else 1400 res = snd_pcm_action_single(ops, substream, state); 1401 snd_pcm_buffer_access_unlock(substream->runtime); 1402 unlock: 1403 up_read(&snd_pcm_link_rwsem); 1404 return res; 1405 } 1406 1407 /* 1408 * start callbacks 1409 */ 1410 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, 1411 snd_pcm_state_t state) 1412 { 1413 struct snd_pcm_runtime *runtime = substream->runtime; 1414 if (runtime->state != SNDRV_PCM_STATE_PREPARED) 1415 return -EBADFD; 1416 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1417 !snd_pcm_playback_data(substream)) 1418 return -EPIPE; 1419 runtime->trigger_tstamp_latched = false; 1420 runtime->trigger_master = substream; 1421 return 0; 1422 } 1423 1424 static int snd_pcm_do_start(struct snd_pcm_substream *substream, 1425 snd_pcm_state_t state) 1426 { 1427 if (substream->runtime->trigger_master != substream) 1428 return 0; 1429 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 1430 } 1431 1432 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, 1433 snd_pcm_state_t state) 1434 { 1435 if (substream->runtime->trigger_master == substream) 1436 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1437 } 1438 1439 static void snd_pcm_post_start(struct snd_pcm_substream *substream, 1440 snd_pcm_state_t state) 1441 { 1442 struct snd_pcm_runtime *runtime = substream->runtime; 1443 snd_pcm_trigger_tstamp(substream); 1444 runtime->hw_ptr_jiffies = jiffies; 1445 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 1446 runtime->rate; 1447 __snd_pcm_set_state(runtime, state); 1448 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1449 runtime->silence_size > 0) 1450 snd_pcm_playback_silence(substream, ULONG_MAX); 1451 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); 1452 } 1453 1454 static const struct action_ops snd_pcm_action_start = { 1455 .pre_action = snd_pcm_pre_start, 1456 .do_action = snd_pcm_do_start, 1457 .undo_action = snd_pcm_undo_start, 1458 .post_action = snd_pcm_post_start 1459 }; 1460 1461 /** 1462 * snd_pcm_start - start all linked streams 1463 * @substream: the PCM substream instance 1464 * 1465 * Return: Zero if successful, or a negative error code. 1466 * The stream lock must be acquired before calling this function. 1467 */ 1468 int snd_pcm_start(struct snd_pcm_substream *substream) 1469 { 1470 return snd_pcm_action(&snd_pcm_action_start, substream, 1471 SNDRV_PCM_STATE_RUNNING); 1472 } 1473 1474 /* take the stream lock and start the streams */ 1475 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) 1476 { 1477 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, 1478 SNDRV_PCM_STATE_RUNNING); 1479 } 1480 1481 /* 1482 * stop callbacks 1483 */ 1484 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, 1485 snd_pcm_state_t state) 1486 { 1487 struct snd_pcm_runtime *runtime = substream->runtime; 1488 if (runtime->state == SNDRV_PCM_STATE_OPEN) 1489 return -EBADFD; 1490 runtime->trigger_master = substream; 1491 return 0; 1492 } 1493 1494 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, 1495 snd_pcm_state_t state) 1496 { 1497 if (substream->runtime->trigger_master == substream && 1498 snd_pcm_running(substream)) { 1499 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 1500 substream->runtime->stop_operating = true; 1501 } 1502 return 0; /* unconditionally stop all substreams */ 1503 } 1504 1505 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, 1506 snd_pcm_state_t state) 1507 { 1508 struct snd_pcm_runtime *runtime = substream->runtime; 1509 if (runtime->state != state) { 1510 snd_pcm_trigger_tstamp(substream); 1511 __snd_pcm_set_state(runtime, state); 1512 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); 1513 } 1514 wake_up(&runtime->sleep); 1515 wake_up(&runtime->tsleep); 1516 } 1517 1518 static const struct action_ops snd_pcm_action_stop = { 1519 .pre_action = snd_pcm_pre_stop, 1520 .do_action = snd_pcm_do_stop, 1521 .post_action = snd_pcm_post_stop 1522 }; 1523 1524 /** 1525 * snd_pcm_stop - try to stop all running streams in the substream group 1526 * @substream: the PCM substream instance 1527 * @state: PCM state after stopping the stream 1528 * 1529 * The state of each stream is then changed to the given state unconditionally. 1530 * 1531 * Return: Zero if successful, or a negative error code. 1532 */ 1533 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 1534 { 1535 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 1536 } 1537 EXPORT_SYMBOL(snd_pcm_stop); 1538 1539 /** 1540 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 1541 * @substream: the PCM substream 1542 * 1543 * After stopping, the state is changed to SETUP. 1544 * Unlike snd_pcm_stop(), this affects only the given stream. 1545 * 1546 * Return: Zero if successful, or a negative error code. 1547 */ 1548 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 1549 { 1550 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 1551 SNDRV_PCM_STATE_SETUP); 1552 } 1553 1554 /** 1555 * snd_pcm_stop_xrun - stop the running streams as XRUN 1556 * @substream: the PCM substream instance 1557 * 1558 * This stops the given running substream (and all linked substreams) as XRUN. 1559 * Unlike snd_pcm_stop(), this function takes the substream lock by itself. 1560 * 1561 * Return: Zero if successful, or a negative error code. 1562 */ 1563 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) 1564 { 1565 unsigned long flags; 1566 1567 snd_pcm_stream_lock_irqsave(substream, flags); 1568 if (substream->runtime && snd_pcm_running(substream)) 1569 __snd_pcm_xrun(substream); 1570 snd_pcm_stream_unlock_irqrestore(substream, flags); 1571 return 0; 1572 } 1573 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); 1574 1575 /* 1576 * pause callbacks: pass boolean (to start pause or resume) as state argument 1577 */ 1578 #define pause_pushed(state) (__force bool)(state) 1579 1580 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, 1581 snd_pcm_state_t state) 1582 { 1583 struct snd_pcm_runtime *runtime = substream->runtime; 1584 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 1585 return -ENOSYS; 1586 if (pause_pushed(state)) { 1587 if (runtime->state != SNDRV_PCM_STATE_RUNNING) 1588 return -EBADFD; 1589 } else if (runtime->state != SNDRV_PCM_STATE_PAUSED) 1590 return -EBADFD; 1591 runtime->trigger_master = substream; 1592 return 0; 1593 } 1594 1595 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, 1596 snd_pcm_state_t state) 1597 { 1598 if (substream->runtime->trigger_master != substream) 1599 return 0; 1600 /* some drivers might use hw_ptr to recover from the pause - 1601 update the hw_ptr now */ 1602 if (pause_pushed(state)) 1603 snd_pcm_update_hw_ptr(substream); 1604 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1605 * a delta between the current jiffies, this gives a large enough 1606 * delta, effectively to skip the check once. 1607 */ 1608 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1609 return substream->ops->trigger(substream, 1610 pause_pushed(state) ? 1611 SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1612 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1613 } 1614 1615 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, 1616 snd_pcm_state_t state) 1617 { 1618 if (substream->runtime->trigger_master == substream) 1619 substream->ops->trigger(substream, 1620 pause_pushed(state) ? 1621 SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1622 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1623 } 1624 1625 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, 1626 snd_pcm_state_t state) 1627 { 1628 struct snd_pcm_runtime *runtime = substream->runtime; 1629 snd_pcm_trigger_tstamp(substream); 1630 if (pause_pushed(state)) { 1631 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED); 1632 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); 1633 wake_up(&runtime->sleep); 1634 wake_up(&runtime->tsleep); 1635 } else { 1636 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING); 1637 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); 1638 } 1639 } 1640 1641 static const struct action_ops snd_pcm_action_pause = { 1642 .pre_action = snd_pcm_pre_pause, 1643 .do_action = snd_pcm_do_pause, 1644 .undo_action = snd_pcm_undo_pause, 1645 .post_action = snd_pcm_post_pause 1646 }; 1647 1648 /* 1649 * Push/release the pause for all linked streams. 1650 */ 1651 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push) 1652 { 1653 return snd_pcm_action(&snd_pcm_action_pause, substream, 1654 (__force snd_pcm_state_t)push); 1655 } 1656 1657 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream, 1658 bool push) 1659 { 1660 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream, 1661 (__force snd_pcm_state_t)push); 1662 } 1663 1664 #ifdef CONFIG_PM 1665 /* suspend callback: state argument ignored */ 1666 1667 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, 1668 snd_pcm_state_t state) 1669 { 1670 struct snd_pcm_runtime *runtime = substream->runtime; 1671 switch (runtime->state) { 1672 case SNDRV_PCM_STATE_SUSPENDED: 1673 return -EBUSY; 1674 /* unresumable PCM state; return -EBUSY for skipping suspend */ 1675 case SNDRV_PCM_STATE_OPEN: 1676 case SNDRV_PCM_STATE_SETUP: 1677 case SNDRV_PCM_STATE_DISCONNECTED: 1678 return -EBUSY; 1679 } 1680 runtime->trigger_master = substream; 1681 return 0; 1682 } 1683 1684 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, 1685 snd_pcm_state_t state) 1686 { 1687 struct snd_pcm_runtime *runtime = substream->runtime; 1688 if (runtime->trigger_master != substream) 1689 return 0; 1690 if (! snd_pcm_running(substream)) 1691 return 0; 1692 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1693 runtime->stop_operating = true; 1694 return 0; /* suspend unconditionally */ 1695 } 1696 1697 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, 1698 snd_pcm_state_t state) 1699 { 1700 struct snd_pcm_runtime *runtime = substream->runtime; 1701 snd_pcm_trigger_tstamp(substream); 1702 runtime->suspended_state = runtime->state; 1703 runtime->status->suspended_state = runtime->suspended_state; 1704 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED); 1705 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1706 wake_up(&runtime->sleep); 1707 wake_up(&runtime->tsleep); 1708 } 1709 1710 static const struct action_ops snd_pcm_action_suspend = { 1711 .pre_action = snd_pcm_pre_suspend, 1712 .do_action = snd_pcm_do_suspend, 1713 .post_action = snd_pcm_post_suspend 1714 }; 1715 1716 /* 1717 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1718 * @substream: the PCM substream 1719 * 1720 * After this call, all streams are changed to SUSPENDED state. 1721 * 1722 * Return: Zero if successful, or a negative error code. 1723 */ 1724 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1725 { 1726 int err; 1727 unsigned long flags; 1728 1729 snd_pcm_stream_lock_irqsave(substream, flags); 1730 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 1731 ACTION_ARG_IGNORE); 1732 snd_pcm_stream_unlock_irqrestore(substream, flags); 1733 return err; 1734 } 1735 1736 /** 1737 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1738 * @pcm: the PCM instance 1739 * 1740 * After this call, all streams are changed to SUSPENDED state. 1741 * 1742 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1743 */ 1744 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1745 { 1746 struct snd_pcm_substream *substream; 1747 int stream, err = 0; 1748 1749 if (! pcm) 1750 return 0; 1751 1752 for_each_pcm_substream(pcm, stream, substream) { 1753 /* FIXME: the open/close code should lock this as well */ 1754 if (!substream->runtime) 1755 continue; 1756 1757 /* 1758 * Skip BE dai link PCM's that are internal and may 1759 * not have their substream ops set. 1760 */ 1761 if (!substream->ops) 1762 continue; 1763 1764 err = snd_pcm_suspend(substream); 1765 if (err < 0 && err != -EBUSY) 1766 return err; 1767 } 1768 1769 for_each_pcm_substream(pcm, stream, substream) 1770 snd_pcm_sync_stop(substream, false); 1771 1772 return 0; 1773 } 1774 EXPORT_SYMBOL(snd_pcm_suspend_all); 1775 1776 /* resume callbacks: state argument ignored */ 1777 1778 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, 1779 snd_pcm_state_t state) 1780 { 1781 struct snd_pcm_runtime *runtime = substream->runtime; 1782 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1783 return -ENOSYS; 1784 runtime->trigger_master = substream; 1785 return 0; 1786 } 1787 1788 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, 1789 snd_pcm_state_t state) 1790 { 1791 struct snd_pcm_runtime *runtime = substream->runtime; 1792 if (runtime->trigger_master != substream) 1793 return 0; 1794 /* DMA not running previously? */ 1795 if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING && 1796 (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING || 1797 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1798 return 0; 1799 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1800 } 1801 1802 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, 1803 snd_pcm_state_t state) 1804 { 1805 if (substream->runtime->trigger_master == substream && 1806 snd_pcm_running(substream)) 1807 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1808 } 1809 1810 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, 1811 snd_pcm_state_t state) 1812 { 1813 struct snd_pcm_runtime *runtime = substream->runtime; 1814 snd_pcm_trigger_tstamp(substream); 1815 __snd_pcm_set_state(runtime, runtime->suspended_state); 1816 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1817 } 1818 1819 static const struct action_ops snd_pcm_action_resume = { 1820 .pre_action = snd_pcm_pre_resume, 1821 .do_action = snd_pcm_do_resume, 1822 .undo_action = snd_pcm_undo_resume, 1823 .post_action = snd_pcm_post_resume 1824 }; 1825 1826 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1827 { 1828 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 1829 ACTION_ARG_IGNORE); 1830 } 1831 1832 #else 1833 1834 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1835 { 1836 return -ENOSYS; 1837 } 1838 1839 #endif /* CONFIG_PM */ 1840 1841 /* 1842 * xrun ioctl 1843 * 1844 * Change the RUNNING stream(s) to XRUN state. 1845 */ 1846 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1847 { 1848 struct snd_pcm_runtime *runtime = substream->runtime; 1849 int result; 1850 1851 snd_pcm_stream_lock_irq(substream); 1852 switch (runtime->state) { 1853 case SNDRV_PCM_STATE_XRUN: 1854 result = 0; /* already there */ 1855 break; 1856 case SNDRV_PCM_STATE_RUNNING: 1857 __snd_pcm_xrun(substream); 1858 result = 0; 1859 break; 1860 default: 1861 result = -EBADFD; 1862 } 1863 snd_pcm_stream_unlock_irq(substream); 1864 return result; 1865 } 1866 1867 /* 1868 * reset ioctl 1869 */ 1870 /* reset callbacks: state argument ignored */ 1871 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, 1872 snd_pcm_state_t state) 1873 { 1874 struct snd_pcm_runtime *runtime = substream->runtime; 1875 switch (runtime->state) { 1876 case SNDRV_PCM_STATE_RUNNING: 1877 case SNDRV_PCM_STATE_PREPARED: 1878 case SNDRV_PCM_STATE_PAUSED: 1879 case SNDRV_PCM_STATE_SUSPENDED: 1880 return 0; 1881 default: 1882 return -EBADFD; 1883 } 1884 } 1885 1886 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, 1887 snd_pcm_state_t state) 1888 { 1889 struct snd_pcm_runtime *runtime = substream->runtime; 1890 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1891 if (err < 0) 1892 return err; 1893 snd_pcm_stream_lock_irq(substream); 1894 runtime->hw_ptr_base = 0; 1895 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1896 runtime->status->hw_ptr % runtime->period_size; 1897 runtime->silence_start = runtime->status->hw_ptr; 1898 runtime->silence_filled = 0; 1899 snd_pcm_stream_unlock_irq(substream); 1900 return 0; 1901 } 1902 1903 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, 1904 snd_pcm_state_t state) 1905 { 1906 struct snd_pcm_runtime *runtime = substream->runtime; 1907 snd_pcm_stream_lock_irq(substream); 1908 runtime->control->appl_ptr = runtime->status->hw_ptr; 1909 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1910 runtime->silence_size > 0) 1911 snd_pcm_playback_silence(substream, ULONG_MAX); 1912 snd_pcm_stream_unlock_irq(substream); 1913 } 1914 1915 static const struct action_ops snd_pcm_action_reset = { 1916 .pre_action = snd_pcm_pre_reset, 1917 .do_action = snd_pcm_do_reset, 1918 .post_action = snd_pcm_post_reset 1919 }; 1920 1921 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1922 { 1923 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 1924 ACTION_ARG_IGNORE); 1925 } 1926 1927 /* 1928 * prepare ioctl 1929 */ 1930 /* pass f_flags as state argument */ 1931 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1932 snd_pcm_state_t state) 1933 { 1934 struct snd_pcm_runtime *runtime = substream->runtime; 1935 int f_flags = (__force int)state; 1936 1937 if (runtime->state == SNDRV_PCM_STATE_OPEN || 1938 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 1939 return -EBADFD; 1940 if (snd_pcm_running(substream)) 1941 return -EBUSY; 1942 substream->f_flags = f_flags; 1943 return 0; 1944 } 1945 1946 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, 1947 snd_pcm_state_t state) 1948 { 1949 int err; 1950 snd_pcm_sync_stop(substream, true); 1951 err = substream->ops->prepare(substream); 1952 if (err < 0) 1953 return err; 1954 return snd_pcm_do_reset(substream, state); 1955 } 1956 1957 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, 1958 snd_pcm_state_t state) 1959 { 1960 struct snd_pcm_runtime *runtime = substream->runtime; 1961 runtime->control->appl_ptr = runtime->status->hw_ptr; 1962 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1963 } 1964 1965 static const struct action_ops snd_pcm_action_prepare = { 1966 .pre_action = snd_pcm_pre_prepare, 1967 .do_action = snd_pcm_do_prepare, 1968 .post_action = snd_pcm_post_prepare 1969 }; 1970 1971 /** 1972 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1973 * @substream: the PCM substream instance 1974 * @file: file to refer f_flags 1975 * 1976 * Return: Zero if successful, or a negative error code. 1977 */ 1978 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1979 struct file *file) 1980 { 1981 int f_flags; 1982 1983 if (file) 1984 f_flags = file->f_flags; 1985 else 1986 f_flags = substream->f_flags; 1987 1988 snd_pcm_stream_lock_irq(substream); 1989 switch (substream->runtime->state) { 1990 case SNDRV_PCM_STATE_PAUSED: 1991 snd_pcm_pause(substream, false); 1992 fallthrough; 1993 case SNDRV_PCM_STATE_SUSPENDED: 1994 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1995 break; 1996 } 1997 snd_pcm_stream_unlock_irq(substream); 1998 1999 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 2000 substream, 2001 (__force snd_pcm_state_t)f_flags); 2002 } 2003 2004 /* 2005 * drain ioctl 2006 */ 2007 2008 /* drain init callbacks: state argument ignored */ 2009 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, 2010 snd_pcm_state_t state) 2011 { 2012 struct snd_pcm_runtime *runtime = substream->runtime; 2013 switch (runtime->state) { 2014 case SNDRV_PCM_STATE_OPEN: 2015 case SNDRV_PCM_STATE_DISCONNECTED: 2016 case SNDRV_PCM_STATE_SUSPENDED: 2017 return -EBADFD; 2018 } 2019 runtime->trigger_master = substream; 2020 return 0; 2021 } 2022 2023 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, 2024 snd_pcm_state_t state) 2025 { 2026 struct snd_pcm_runtime *runtime = substream->runtime; 2027 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 2028 switch (runtime->state) { 2029 case SNDRV_PCM_STATE_PREPARED: 2030 /* start playback stream if possible */ 2031 if (! snd_pcm_playback_empty(substream)) { 2032 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 2033 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 2034 } else { 2035 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP); 2036 } 2037 break; 2038 case SNDRV_PCM_STATE_RUNNING: 2039 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING); 2040 break; 2041 case SNDRV_PCM_STATE_XRUN: 2042 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP); 2043 break; 2044 default: 2045 break; 2046 } 2047 } else { 2048 /* stop running stream */ 2049 if (runtime->state == SNDRV_PCM_STATE_RUNNING) { 2050 snd_pcm_state_t new_state; 2051 2052 new_state = snd_pcm_capture_avail(runtime) > 0 ? 2053 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 2054 snd_pcm_do_stop(substream, new_state); 2055 snd_pcm_post_stop(substream, new_state); 2056 } 2057 } 2058 2059 if (runtime->state == SNDRV_PCM_STATE_DRAINING && 2060 runtime->trigger_master == substream && 2061 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 2062 return substream->ops->trigger(substream, 2063 SNDRV_PCM_TRIGGER_DRAIN); 2064 2065 return 0; 2066 } 2067 2068 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, 2069 snd_pcm_state_t state) 2070 { 2071 } 2072 2073 static const struct action_ops snd_pcm_action_drain_init = { 2074 .pre_action = snd_pcm_pre_drain_init, 2075 .do_action = snd_pcm_do_drain_init, 2076 .post_action = snd_pcm_post_drain_init 2077 }; 2078 2079 /* 2080 * Drain the stream(s). 2081 * When the substream is linked, sync until the draining of all playback streams 2082 * is finished. 2083 * After this call, all streams are supposed to be either SETUP or DRAINING 2084 * (capture only) state. 2085 */ 2086 static int snd_pcm_drain(struct snd_pcm_substream *substream, 2087 struct file *file) 2088 { 2089 struct snd_card *card; 2090 struct snd_pcm_runtime *runtime; 2091 struct snd_pcm_substream *s; 2092 struct snd_pcm_group *group; 2093 wait_queue_entry_t wait; 2094 int result = 0; 2095 int nonblock = 0; 2096 2097 card = substream->pcm->card; 2098 runtime = substream->runtime; 2099 2100 if (runtime->state == SNDRV_PCM_STATE_OPEN) 2101 return -EBADFD; 2102 2103 if (file) { 2104 if (file->f_flags & O_NONBLOCK) 2105 nonblock = 1; 2106 } else if (substream->f_flags & O_NONBLOCK) 2107 nonblock = 1; 2108 2109 snd_pcm_stream_lock_irq(substream); 2110 /* resume pause */ 2111 if (runtime->state == SNDRV_PCM_STATE_PAUSED) 2112 snd_pcm_pause(substream, false); 2113 2114 /* pre-start/stop - all running streams are changed to DRAINING state */ 2115 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 2116 ACTION_ARG_IGNORE); 2117 if (result < 0) 2118 goto unlock; 2119 /* in non-blocking, we don't wait in ioctl but let caller poll */ 2120 if (nonblock) { 2121 result = -EAGAIN; 2122 goto unlock; 2123 } 2124 2125 for (;;) { 2126 long tout; 2127 struct snd_pcm_runtime *to_check; 2128 if (signal_pending(current)) { 2129 result = -ERESTARTSYS; 2130 break; 2131 } 2132 /* find a substream to drain */ 2133 to_check = NULL; 2134 group = snd_pcm_stream_group_ref(substream); 2135 snd_pcm_group_for_each_entry(s, substream) { 2136 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 2137 continue; 2138 runtime = s->runtime; 2139 if (runtime->state == SNDRV_PCM_STATE_DRAINING) { 2140 to_check = runtime; 2141 break; 2142 } 2143 } 2144 snd_pcm_group_unref(group, substream); 2145 if (!to_check) 2146 break; /* all drained */ 2147 init_waitqueue_entry(&wait, current); 2148 set_current_state(TASK_INTERRUPTIBLE); 2149 add_wait_queue(&to_check->sleep, &wait); 2150 snd_pcm_stream_unlock_irq(substream); 2151 if (runtime->no_period_wakeup) 2152 tout = MAX_SCHEDULE_TIMEOUT; 2153 else { 2154 tout = 10; 2155 if (runtime->rate) { 2156 long t = runtime->period_size * 2 / runtime->rate; 2157 tout = max(t, tout); 2158 } 2159 tout = msecs_to_jiffies(tout * 1000); 2160 } 2161 tout = schedule_timeout(tout); 2162 2163 snd_pcm_stream_lock_irq(substream); 2164 group = snd_pcm_stream_group_ref(substream); 2165 snd_pcm_group_for_each_entry(s, substream) { 2166 if (s->runtime == to_check) { 2167 remove_wait_queue(&to_check->sleep, &wait); 2168 break; 2169 } 2170 } 2171 snd_pcm_group_unref(group, substream); 2172 2173 if (card->shutdown) { 2174 result = -ENODEV; 2175 break; 2176 } 2177 if (tout == 0) { 2178 if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED) 2179 result = -ESTRPIPE; 2180 else { 2181 dev_dbg(substream->pcm->card->dev, 2182 "playback drain error (DMA or IRQ trouble?)\n"); 2183 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2184 result = -EIO; 2185 } 2186 break; 2187 } 2188 } 2189 2190 unlock: 2191 snd_pcm_stream_unlock_irq(substream); 2192 2193 return result; 2194 } 2195 2196 /* 2197 * drop ioctl 2198 * 2199 * Immediately put all linked substreams into SETUP state. 2200 */ 2201 static int snd_pcm_drop(struct snd_pcm_substream *substream) 2202 { 2203 struct snd_pcm_runtime *runtime; 2204 int result = 0; 2205 2206 if (PCM_RUNTIME_CHECK(substream)) 2207 return -ENXIO; 2208 runtime = substream->runtime; 2209 2210 if (runtime->state == SNDRV_PCM_STATE_OPEN || 2211 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 2212 return -EBADFD; 2213 2214 snd_pcm_stream_lock_irq(substream); 2215 /* resume pause */ 2216 if (runtime->state == SNDRV_PCM_STATE_PAUSED) 2217 snd_pcm_pause(substream, false); 2218 2219 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2220 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 2221 snd_pcm_stream_unlock_irq(substream); 2222 2223 return result; 2224 } 2225 2226 2227 static bool is_pcm_file(struct file *file) 2228 { 2229 struct inode *inode = file_inode(file); 2230 struct snd_pcm *pcm; 2231 unsigned int minor; 2232 2233 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2234 return false; 2235 minor = iminor(inode); 2236 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2237 if (!pcm) 2238 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2239 if (!pcm) 2240 return false; 2241 snd_card_unref(pcm->card); 2242 return true; 2243 } 2244 2245 /* 2246 * PCM link handling 2247 */ 2248 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2249 { 2250 int res = 0; 2251 struct snd_pcm_file *pcm_file; 2252 struct snd_pcm_substream *substream1; 2253 struct snd_pcm_group *group, *target_group; 2254 bool nonatomic = substream->pcm->nonatomic; 2255 struct fd f = fdget(fd); 2256 2257 if (!f.file) 2258 return -EBADFD; 2259 if (!is_pcm_file(f.file)) { 2260 res = -EBADFD; 2261 goto _badf; 2262 } 2263 pcm_file = f.file->private_data; 2264 substream1 = pcm_file->substream; 2265 2266 if (substream == substream1) { 2267 res = -EINVAL; 2268 goto _badf; 2269 } 2270 2271 group = kzalloc(sizeof(*group), GFP_KERNEL); 2272 if (!group) { 2273 res = -ENOMEM; 2274 goto _nolock; 2275 } 2276 snd_pcm_group_init(group); 2277 2278 down_write(&snd_pcm_link_rwsem); 2279 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN || 2280 substream->runtime->state != substream1->runtime->state || 2281 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2282 res = -EBADFD; 2283 goto _end; 2284 } 2285 if (snd_pcm_stream_linked(substream1)) { 2286 res = -EALREADY; 2287 goto _end; 2288 } 2289 2290 snd_pcm_stream_lock_irq(substream); 2291 if (!snd_pcm_stream_linked(substream)) { 2292 snd_pcm_group_assign(substream, group); 2293 group = NULL; /* assigned, don't free this one below */ 2294 } 2295 target_group = substream->group; 2296 snd_pcm_stream_unlock_irq(substream); 2297 2298 snd_pcm_group_lock_irq(target_group, nonatomic); 2299 snd_pcm_stream_lock_nested(substream1); 2300 snd_pcm_group_assign(substream1, target_group); 2301 refcount_inc(&target_group->refs); 2302 snd_pcm_stream_unlock(substream1); 2303 snd_pcm_group_unlock_irq(target_group, nonatomic); 2304 _end: 2305 up_write(&snd_pcm_link_rwsem); 2306 _nolock: 2307 kfree(group); 2308 _badf: 2309 fdput(f); 2310 return res; 2311 } 2312 2313 static void relink_to_local(struct snd_pcm_substream *substream) 2314 { 2315 snd_pcm_stream_lock_nested(substream); 2316 snd_pcm_group_assign(substream, &substream->self_group); 2317 snd_pcm_stream_unlock(substream); 2318 } 2319 2320 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2321 { 2322 struct snd_pcm_group *group; 2323 bool nonatomic = substream->pcm->nonatomic; 2324 bool do_free = false; 2325 int res = 0; 2326 2327 down_write(&snd_pcm_link_rwsem); 2328 2329 if (!snd_pcm_stream_linked(substream)) { 2330 res = -EALREADY; 2331 goto _end; 2332 } 2333 2334 group = substream->group; 2335 snd_pcm_group_lock_irq(group, nonatomic); 2336 2337 relink_to_local(substream); 2338 refcount_dec(&group->refs); 2339 2340 /* detach the last stream, too */ 2341 if (list_is_singular(&group->substreams)) { 2342 relink_to_local(list_first_entry(&group->substreams, 2343 struct snd_pcm_substream, 2344 link_list)); 2345 do_free = refcount_dec_and_test(&group->refs); 2346 } 2347 2348 snd_pcm_group_unlock_irq(group, nonatomic); 2349 if (do_free) 2350 kfree(group); 2351 2352 _end: 2353 up_write(&snd_pcm_link_rwsem); 2354 return res; 2355 } 2356 2357 /* 2358 * hw configurator 2359 */ 2360 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2361 struct snd_pcm_hw_rule *rule) 2362 { 2363 struct snd_interval t; 2364 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2365 hw_param_interval_c(params, rule->deps[1]), &t); 2366 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2367 } 2368 2369 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2370 struct snd_pcm_hw_rule *rule) 2371 { 2372 struct snd_interval t; 2373 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2374 hw_param_interval_c(params, rule->deps[1]), &t); 2375 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2376 } 2377 2378 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2379 struct snd_pcm_hw_rule *rule) 2380 { 2381 struct snd_interval t; 2382 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2383 hw_param_interval_c(params, rule->deps[1]), 2384 (unsigned long) rule->private, &t); 2385 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2386 } 2387 2388 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2389 struct snd_pcm_hw_rule *rule) 2390 { 2391 struct snd_interval t; 2392 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2393 (unsigned long) rule->private, 2394 hw_param_interval_c(params, rule->deps[1]), &t); 2395 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2396 } 2397 2398 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2399 struct snd_pcm_hw_rule *rule) 2400 { 2401 snd_pcm_format_t k; 2402 const struct snd_interval *i = 2403 hw_param_interval_c(params, rule->deps[0]); 2404 struct snd_mask m; 2405 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2406 snd_mask_any(&m); 2407 pcm_for_each_format(k) { 2408 int bits; 2409 if (!snd_mask_test_format(mask, k)) 2410 continue; 2411 bits = snd_pcm_format_physical_width(k); 2412 if (bits <= 0) 2413 continue; /* ignore invalid formats */ 2414 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2415 snd_mask_reset(&m, (__force unsigned)k); 2416 } 2417 return snd_mask_refine(mask, &m); 2418 } 2419 2420 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2421 struct snd_pcm_hw_rule *rule) 2422 { 2423 struct snd_interval t; 2424 snd_pcm_format_t k; 2425 2426 t.min = UINT_MAX; 2427 t.max = 0; 2428 t.openmin = 0; 2429 t.openmax = 0; 2430 pcm_for_each_format(k) { 2431 int bits; 2432 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2433 continue; 2434 bits = snd_pcm_format_physical_width(k); 2435 if (bits <= 0) 2436 continue; /* ignore invalid formats */ 2437 if (t.min > (unsigned)bits) 2438 t.min = bits; 2439 if (t.max < (unsigned)bits) 2440 t.max = bits; 2441 } 2442 t.integer = 1; 2443 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2444 } 2445 2446 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2447 #error "Change this table" 2448 #endif 2449 2450 static const unsigned int rates[] = { 2451 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2452 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2453 }; 2454 2455 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2456 .count = ARRAY_SIZE(rates), 2457 .list = rates, 2458 }; 2459 2460 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2461 struct snd_pcm_hw_rule *rule) 2462 { 2463 struct snd_pcm_hardware *hw = rule->private; 2464 return snd_interval_list(hw_param_interval(params, rule->var), 2465 snd_pcm_known_rates.count, 2466 snd_pcm_known_rates.list, hw->rates); 2467 } 2468 2469 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2470 struct snd_pcm_hw_rule *rule) 2471 { 2472 struct snd_interval t; 2473 struct snd_pcm_substream *substream = rule->private; 2474 t.min = 0; 2475 t.max = substream->buffer_bytes_max; 2476 t.openmin = 0; 2477 t.openmax = 0; 2478 t.integer = 1; 2479 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2480 } 2481 2482 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2483 { 2484 struct snd_pcm_runtime *runtime = substream->runtime; 2485 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2486 int k, err; 2487 2488 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2489 snd_mask_any(constrs_mask(constrs, k)); 2490 } 2491 2492 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2493 snd_interval_any(constrs_interval(constrs, k)); 2494 } 2495 2496 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2497 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2498 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2499 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2500 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2501 2502 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2503 snd_pcm_hw_rule_format, NULL, 2504 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2505 if (err < 0) 2506 return err; 2507 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2508 snd_pcm_hw_rule_sample_bits, NULL, 2509 SNDRV_PCM_HW_PARAM_FORMAT, 2510 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2511 if (err < 0) 2512 return err; 2513 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2514 snd_pcm_hw_rule_div, NULL, 2515 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2516 if (err < 0) 2517 return err; 2518 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2519 snd_pcm_hw_rule_mul, NULL, 2520 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2521 if (err < 0) 2522 return err; 2523 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2524 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2525 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2526 if (err < 0) 2527 return err; 2528 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2529 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2530 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2531 if (err < 0) 2532 return err; 2533 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2534 snd_pcm_hw_rule_div, NULL, 2535 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2536 if (err < 0) 2537 return err; 2538 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2539 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2540 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2541 if (err < 0) 2542 return err; 2543 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2544 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2545 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2546 if (err < 0) 2547 return err; 2548 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2549 snd_pcm_hw_rule_div, NULL, 2550 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2551 if (err < 0) 2552 return err; 2553 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2554 snd_pcm_hw_rule_div, NULL, 2555 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2556 if (err < 0) 2557 return err; 2558 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2559 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2560 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2561 if (err < 0) 2562 return err; 2563 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2564 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2565 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2566 if (err < 0) 2567 return err; 2568 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2569 snd_pcm_hw_rule_mul, NULL, 2570 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2571 if (err < 0) 2572 return err; 2573 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2574 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2575 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2576 if (err < 0) 2577 return err; 2578 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2579 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2580 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2581 if (err < 0) 2582 return err; 2583 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2584 snd_pcm_hw_rule_muldivk, (void*) 8, 2585 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2586 if (err < 0) 2587 return err; 2588 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2589 snd_pcm_hw_rule_muldivk, (void*) 8, 2590 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2591 if (err < 0) 2592 return err; 2593 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2594 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2595 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2596 if (err < 0) 2597 return err; 2598 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2599 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2600 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2601 if (err < 0) 2602 return err; 2603 return 0; 2604 } 2605 2606 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2607 { 2608 struct snd_pcm_runtime *runtime = substream->runtime; 2609 struct snd_pcm_hardware *hw = &runtime->hw; 2610 int err; 2611 unsigned int mask = 0; 2612 2613 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2614 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED); 2615 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2616 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 2617 if (hw_support_mmap(substream)) { 2618 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2619 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED); 2620 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2621 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED); 2622 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2623 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX); 2624 } 2625 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2626 if (err < 0) 2627 return err; 2628 2629 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2630 if (err < 0) 2631 return err; 2632 2633 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 2634 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD)); 2635 if (err < 0) 2636 return err; 2637 2638 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2639 hw->channels_min, hw->channels_max); 2640 if (err < 0) 2641 return err; 2642 2643 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2644 hw->rate_min, hw->rate_max); 2645 if (err < 0) 2646 return err; 2647 2648 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2649 hw->period_bytes_min, hw->period_bytes_max); 2650 if (err < 0) 2651 return err; 2652 2653 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2654 hw->periods_min, hw->periods_max); 2655 if (err < 0) 2656 return err; 2657 2658 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2659 hw->period_bytes_min, hw->buffer_bytes_max); 2660 if (err < 0) 2661 return err; 2662 2663 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2664 snd_pcm_hw_rule_buffer_bytes_max, substream, 2665 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2666 if (err < 0) 2667 return err; 2668 2669 /* FIXME: remove */ 2670 if (runtime->dma_bytes) { 2671 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2672 if (err < 0) 2673 return err; 2674 } 2675 2676 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2677 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2678 snd_pcm_hw_rule_rate, hw, 2679 SNDRV_PCM_HW_PARAM_RATE, -1); 2680 if (err < 0) 2681 return err; 2682 } 2683 2684 /* FIXME: this belong to lowlevel */ 2685 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2686 2687 return 0; 2688 } 2689 2690 static void pcm_release_private(struct snd_pcm_substream *substream) 2691 { 2692 if (snd_pcm_stream_linked(substream)) 2693 snd_pcm_unlink(substream); 2694 } 2695 2696 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2697 { 2698 substream->ref_count--; 2699 if (substream->ref_count > 0) 2700 return; 2701 2702 snd_pcm_drop(substream); 2703 if (substream->hw_opened) { 2704 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN) 2705 do_hw_free(substream); 2706 substream->ops->close(substream); 2707 substream->hw_opened = 0; 2708 } 2709 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 2710 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 2711 if (substream->pcm_release) { 2712 substream->pcm_release(substream); 2713 substream->pcm_release = NULL; 2714 } 2715 snd_pcm_detach_substream(substream); 2716 } 2717 EXPORT_SYMBOL(snd_pcm_release_substream); 2718 2719 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2720 struct file *file, 2721 struct snd_pcm_substream **rsubstream) 2722 { 2723 struct snd_pcm_substream *substream; 2724 int err; 2725 2726 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2727 if (err < 0) 2728 return err; 2729 if (substream->ref_count > 1) { 2730 *rsubstream = substream; 2731 return 0; 2732 } 2733 2734 err = snd_pcm_hw_constraints_init(substream); 2735 if (err < 0) { 2736 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2737 goto error; 2738 } 2739 2740 err = substream->ops->open(substream); 2741 if (err < 0) 2742 goto error; 2743 2744 substream->hw_opened = 1; 2745 2746 err = snd_pcm_hw_constraints_complete(substream); 2747 if (err < 0) { 2748 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2749 goto error; 2750 } 2751 2752 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever 2753 * the DMA buffer requires it 2754 */ 2755 if (substream->managed_buffer_alloc && 2756 substream->dma_buffer.dev.need_sync) 2757 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC; 2758 2759 *rsubstream = substream; 2760 return 0; 2761 2762 error: 2763 snd_pcm_release_substream(substream); 2764 return err; 2765 } 2766 EXPORT_SYMBOL(snd_pcm_open_substream); 2767 2768 static int snd_pcm_open_file(struct file *file, 2769 struct snd_pcm *pcm, 2770 int stream) 2771 { 2772 struct snd_pcm_file *pcm_file; 2773 struct snd_pcm_substream *substream; 2774 int err; 2775 2776 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2777 if (err < 0) 2778 return err; 2779 2780 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2781 if (pcm_file == NULL) { 2782 snd_pcm_release_substream(substream); 2783 return -ENOMEM; 2784 } 2785 pcm_file->substream = substream; 2786 if (substream->ref_count == 1) 2787 substream->pcm_release = pcm_release_private; 2788 file->private_data = pcm_file; 2789 2790 return 0; 2791 } 2792 2793 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2794 { 2795 struct snd_pcm *pcm; 2796 int err = nonseekable_open(inode, file); 2797 if (err < 0) 2798 return err; 2799 pcm = snd_lookup_minor_data(iminor(inode), 2800 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2801 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2802 if (pcm) 2803 snd_card_unref(pcm->card); 2804 return err; 2805 } 2806 2807 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2808 { 2809 struct snd_pcm *pcm; 2810 int err = nonseekable_open(inode, file); 2811 if (err < 0) 2812 return err; 2813 pcm = snd_lookup_minor_data(iminor(inode), 2814 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2815 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2816 if (pcm) 2817 snd_card_unref(pcm->card); 2818 return err; 2819 } 2820 2821 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2822 { 2823 int err; 2824 wait_queue_entry_t wait; 2825 2826 if (pcm == NULL) { 2827 err = -ENODEV; 2828 goto __error1; 2829 } 2830 err = snd_card_file_add(pcm->card, file); 2831 if (err < 0) 2832 goto __error1; 2833 if (!try_module_get(pcm->card->module)) { 2834 err = -EFAULT; 2835 goto __error2; 2836 } 2837 init_waitqueue_entry(&wait, current); 2838 add_wait_queue(&pcm->open_wait, &wait); 2839 mutex_lock(&pcm->open_mutex); 2840 while (1) { 2841 err = snd_pcm_open_file(file, pcm, stream); 2842 if (err >= 0) 2843 break; 2844 if (err == -EAGAIN) { 2845 if (file->f_flags & O_NONBLOCK) { 2846 err = -EBUSY; 2847 break; 2848 } 2849 } else 2850 break; 2851 set_current_state(TASK_INTERRUPTIBLE); 2852 mutex_unlock(&pcm->open_mutex); 2853 schedule(); 2854 mutex_lock(&pcm->open_mutex); 2855 if (pcm->card->shutdown) { 2856 err = -ENODEV; 2857 break; 2858 } 2859 if (signal_pending(current)) { 2860 err = -ERESTARTSYS; 2861 break; 2862 } 2863 } 2864 remove_wait_queue(&pcm->open_wait, &wait); 2865 mutex_unlock(&pcm->open_mutex); 2866 if (err < 0) 2867 goto __error; 2868 return err; 2869 2870 __error: 2871 module_put(pcm->card->module); 2872 __error2: 2873 snd_card_file_remove(pcm->card, file); 2874 __error1: 2875 return err; 2876 } 2877 2878 static int snd_pcm_release(struct inode *inode, struct file *file) 2879 { 2880 struct snd_pcm *pcm; 2881 struct snd_pcm_substream *substream; 2882 struct snd_pcm_file *pcm_file; 2883 2884 pcm_file = file->private_data; 2885 substream = pcm_file->substream; 2886 if (snd_BUG_ON(!substream)) 2887 return -ENXIO; 2888 pcm = substream->pcm; 2889 2890 /* block until the device gets woken up as it may touch the hardware */ 2891 snd_power_wait(pcm->card); 2892 2893 mutex_lock(&pcm->open_mutex); 2894 snd_pcm_release_substream(substream); 2895 kfree(pcm_file); 2896 mutex_unlock(&pcm->open_mutex); 2897 wake_up(&pcm->open_wait); 2898 module_put(pcm->card->module); 2899 snd_card_file_remove(pcm->card, file); 2900 return 0; 2901 } 2902 2903 /* check and update PCM state; return 0 or a negative error 2904 * call this inside PCM lock 2905 */ 2906 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2907 { 2908 switch (substream->runtime->state) { 2909 case SNDRV_PCM_STATE_DRAINING: 2910 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2911 return -EBADFD; 2912 fallthrough; 2913 case SNDRV_PCM_STATE_RUNNING: 2914 return snd_pcm_update_hw_ptr(substream); 2915 case SNDRV_PCM_STATE_PREPARED: 2916 case SNDRV_PCM_STATE_PAUSED: 2917 return 0; 2918 case SNDRV_PCM_STATE_SUSPENDED: 2919 return -ESTRPIPE; 2920 case SNDRV_PCM_STATE_XRUN: 2921 return -EPIPE; 2922 default: 2923 return -EBADFD; 2924 } 2925 } 2926 2927 /* increase the appl_ptr; returns the processed frames or a negative error */ 2928 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2929 snd_pcm_uframes_t frames, 2930 snd_pcm_sframes_t avail) 2931 { 2932 struct snd_pcm_runtime *runtime = substream->runtime; 2933 snd_pcm_sframes_t appl_ptr; 2934 int ret; 2935 2936 if (avail <= 0) 2937 return 0; 2938 if (frames > (snd_pcm_uframes_t)avail) 2939 frames = avail; 2940 appl_ptr = runtime->control->appl_ptr + frames; 2941 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2942 appl_ptr -= runtime->boundary; 2943 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2944 return ret < 0 ? ret : frames; 2945 } 2946 2947 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2948 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2949 snd_pcm_uframes_t frames, 2950 snd_pcm_sframes_t avail) 2951 { 2952 struct snd_pcm_runtime *runtime = substream->runtime; 2953 snd_pcm_sframes_t appl_ptr; 2954 int ret; 2955 2956 if (avail <= 0) 2957 return 0; 2958 if (frames > (snd_pcm_uframes_t)avail) 2959 frames = avail; 2960 appl_ptr = runtime->control->appl_ptr - frames; 2961 if (appl_ptr < 0) 2962 appl_ptr += runtime->boundary; 2963 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2964 /* NOTE: we return zero for errors because PulseAudio gets depressed 2965 * upon receiving an error from rewind ioctl and stops processing 2966 * any longer. Returning zero means that no rewind is done, so 2967 * it's not absolutely wrong to answer like that. 2968 */ 2969 return ret < 0 ? 0 : frames; 2970 } 2971 2972 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2973 snd_pcm_uframes_t frames) 2974 { 2975 snd_pcm_sframes_t ret; 2976 2977 if (frames == 0) 2978 return 0; 2979 2980 snd_pcm_stream_lock_irq(substream); 2981 ret = do_pcm_hwsync(substream); 2982 if (!ret) 2983 ret = rewind_appl_ptr(substream, frames, 2984 snd_pcm_hw_avail(substream)); 2985 snd_pcm_stream_unlock_irq(substream); 2986 if (ret >= 0) 2987 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 2988 return ret; 2989 } 2990 2991 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2992 snd_pcm_uframes_t frames) 2993 { 2994 snd_pcm_sframes_t ret; 2995 2996 if (frames == 0) 2997 return 0; 2998 2999 snd_pcm_stream_lock_irq(substream); 3000 ret = do_pcm_hwsync(substream); 3001 if (!ret) 3002 ret = forward_appl_ptr(substream, frames, 3003 snd_pcm_avail(substream)); 3004 snd_pcm_stream_unlock_irq(substream); 3005 if (ret >= 0) 3006 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3007 return ret; 3008 } 3009 3010 static int snd_pcm_delay(struct snd_pcm_substream *substream, 3011 snd_pcm_sframes_t *delay) 3012 { 3013 int err; 3014 3015 snd_pcm_stream_lock_irq(substream); 3016 err = do_pcm_hwsync(substream); 3017 if (delay && !err) 3018 *delay = snd_pcm_calc_delay(substream); 3019 snd_pcm_stream_unlock_irq(substream); 3020 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU); 3021 3022 return err; 3023 } 3024 3025 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream) 3026 { 3027 return snd_pcm_delay(substream, NULL); 3028 } 3029 3030 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 3031 struct snd_pcm_sync_ptr __user *_sync_ptr) 3032 { 3033 struct snd_pcm_runtime *runtime = substream->runtime; 3034 struct snd_pcm_sync_ptr sync_ptr; 3035 volatile struct snd_pcm_mmap_status *status; 3036 volatile struct snd_pcm_mmap_control *control; 3037 int err; 3038 3039 memset(&sync_ptr, 0, sizeof(sync_ptr)); 3040 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 3041 return -EFAULT; 3042 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 3043 return -EFAULT; 3044 status = runtime->status; 3045 control = runtime->control; 3046 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3047 err = snd_pcm_hwsync(substream); 3048 if (err < 0) 3049 return err; 3050 } 3051 snd_pcm_stream_lock_irq(substream); 3052 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 3053 err = pcm_lib_apply_appl_ptr(substream, 3054 sync_ptr.c.control.appl_ptr); 3055 if (err < 0) { 3056 snd_pcm_stream_unlock_irq(substream); 3057 return err; 3058 } 3059 } else { 3060 sync_ptr.c.control.appl_ptr = control->appl_ptr; 3061 } 3062 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3063 control->avail_min = sync_ptr.c.control.avail_min; 3064 else 3065 sync_ptr.c.control.avail_min = control->avail_min; 3066 sync_ptr.s.status.state = status->state; 3067 sync_ptr.s.status.hw_ptr = status->hw_ptr; 3068 sync_ptr.s.status.tstamp = status->tstamp; 3069 sync_ptr.s.status.suspended_state = status->suspended_state; 3070 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 3071 snd_pcm_stream_unlock_irq(substream); 3072 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 3073 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3074 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 3075 return -EFAULT; 3076 return 0; 3077 } 3078 3079 struct snd_pcm_mmap_status32 { 3080 snd_pcm_state_t state; 3081 s32 pad1; 3082 u32 hw_ptr; 3083 s32 tstamp_sec; 3084 s32 tstamp_nsec; 3085 snd_pcm_state_t suspended_state; 3086 s32 audio_tstamp_sec; 3087 s32 audio_tstamp_nsec; 3088 } __attribute__((packed)); 3089 3090 struct snd_pcm_mmap_control32 { 3091 u32 appl_ptr; 3092 u32 avail_min; 3093 }; 3094 3095 struct snd_pcm_sync_ptr32 { 3096 u32 flags; 3097 union { 3098 struct snd_pcm_mmap_status32 status; 3099 unsigned char reserved[64]; 3100 } s; 3101 union { 3102 struct snd_pcm_mmap_control32 control; 3103 unsigned char reserved[64]; 3104 } c; 3105 } __attribute__((packed)); 3106 3107 /* recalcuate the boundary within 32bit */ 3108 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime) 3109 { 3110 snd_pcm_uframes_t boundary; 3111 3112 if (! runtime->buffer_size) 3113 return 0; 3114 boundary = runtime->buffer_size; 3115 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size) 3116 boundary *= 2; 3117 return boundary; 3118 } 3119 3120 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, 3121 struct snd_pcm_sync_ptr32 __user *src) 3122 { 3123 struct snd_pcm_runtime *runtime = substream->runtime; 3124 volatile struct snd_pcm_mmap_status *status; 3125 volatile struct snd_pcm_mmap_control *control; 3126 u32 sflags; 3127 struct snd_pcm_mmap_control scontrol; 3128 struct snd_pcm_mmap_status sstatus; 3129 snd_pcm_uframes_t boundary; 3130 int err; 3131 3132 if (snd_BUG_ON(!runtime)) 3133 return -EINVAL; 3134 3135 if (get_user(sflags, &src->flags) || 3136 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3137 get_user(scontrol.avail_min, &src->c.control.avail_min)) 3138 return -EFAULT; 3139 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3140 err = snd_pcm_hwsync(substream); 3141 if (err < 0) 3142 return err; 3143 } 3144 status = runtime->status; 3145 control = runtime->control; 3146 boundary = recalculate_boundary(runtime); 3147 if (! boundary) 3148 boundary = 0x7fffffff; 3149 snd_pcm_stream_lock_irq(substream); 3150 /* FIXME: we should consider the boundary for the sync from app */ 3151 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) { 3152 err = pcm_lib_apply_appl_ptr(substream, 3153 scontrol.appl_ptr); 3154 if (err < 0) { 3155 snd_pcm_stream_unlock_irq(substream); 3156 return err; 3157 } 3158 } else 3159 scontrol.appl_ptr = control->appl_ptr % boundary; 3160 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3161 control->avail_min = scontrol.avail_min; 3162 else 3163 scontrol.avail_min = control->avail_min; 3164 sstatus.state = status->state; 3165 sstatus.hw_ptr = status->hw_ptr % boundary; 3166 sstatus.tstamp = status->tstamp; 3167 sstatus.suspended_state = status->suspended_state; 3168 sstatus.audio_tstamp = status->audio_tstamp; 3169 snd_pcm_stream_unlock_irq(substream); 3170 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 3171 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3172 if (put_user(sstatus.state, &src->s.status.state) || 3173 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || 3174 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) || 3175 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) || 3176 put_user(sstatus.suspended_state, &src->s.status.suspended_state) || 3177 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) || 3178 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) || 3179 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3180 put_user(scontrol.avail_min, &src->c.control.avail_min)) 3181 return -EFAULT; 3182 3183 return 0; 3184 } 3185 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32) 3186 3187 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 3188 { 3189 struct snd_pcm_runtime *runtime = substream->runtime; 3190 int arg; 3191 3192 if (get_user(arg, _arg)) 3193 return -EFAULT; 3194 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 3195 return -EINVAL; 3196 runtime->tstamp_type = arg; 3197 return 0; 3198 } 3199 3200 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 3201 struct snd_xferi __user *_xferi) 3202 { 3203 struct snd_xferi xferi; 3204 struct snd_pcm_runtime *runtime = substream->runtime; 3205 snd_pcm_sframes_t result; 3206 3207 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3208 return -EBADFD; 3209 if (put_user(0, &_xferi->result)) 3210 return -EFAULT; 3211 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 3212 return -EFAULT; 3213 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3214 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 3215 else 3216 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 3217 if (put_user(result, &_xferi->result)) 3218 return -EFAULT; 3219 return result < 0 ? result : 0; 3220 } 3221 3222 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 3223 struct snd_xfern __user *_xfern) 3224 { 3225 struct snd_xfern xfern; 3226 struct snd_pcm_runtime *runtime = substream->runtime; 3227 void *bufs; 3228 snd_pcm_sframes_t result; 3229 3230 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3231 return -EBADFD; 3232 if (runtime->channels > 128) 3233 return -EINVAL; 3234 if (put_user(0, &_xfern->result)) 3235 return -EFAULT; 3236 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 3237 return -EFAULT; 3238 3239 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 3240 if (IS_ERR(bufs)) 3241 return PTR_ERR(bufs); 3242 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3243 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 3244 else 3245 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 3246 kfree(bufs); 3247 if (put_user(result, &_xfern->result)) 3248 return -EFAULT; 3249 return result < 0 ? result : 0; 3250 } 3251 3252 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 3253 snd_pcm_uframes_t __user *_frames) 3254 { 3255 snd_pcm_uframes_t frames; 3256 snd_pcm_sframes_t result; 3257 3258 if (get_user(frames, _frames)) 3259 return -EFAULT; 3260 if (put_user(0, _frames)) 3261 return -EFAULT; 3262 result = snd_pcm_rewind(substream, frames); 3263 if (put_user(result, _frames)) 3264 return -EFAULT; 3265 return result < 0 ? result : 0; 3266 } 3267 3268 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 3269 snd_pcm_uframes_t __user *_frames) 3270 { 3271 snd_pcm_uframes_t frames; 3272 snd_pcm_sframes_t result; 3273 3274 if (get_user(frames, _frames)) 3275 return -EFAULT; 3276 if (put_user(0, _frames)) 3277 return -EFAULT; 3278 result = snd_pcm_forward(substream, frames); 3279 if (put_user(result, _frames)) 3280 return -EFAULT; 3281 return result < 0 ? result : 0; 3282 } 3283 3284 static int snd_pcm_common_ioctl(struct file *file, 3285 struct snd_pcm_substream *substream, 3286 unsigned int cmd, void __user *arg) 3287 { 3288 struct snd_pcm_file *pcm_file = file->private_data; 3289 int res; 3290 3291 if (PCM_RUNTIME_CHECK(substream)) 3292 return -ENXIO; 3293 3294 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3295 return -EBADFD; 3296 3297 res = snd_power_wait(substream->pcm->card); 3298 if (res < 0) 3299 return res; 3300 3301 switch (cmd) { 3302 case SNDRV_PCM_IOCTL_PVERSION: 3303 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 3304 case SNDRV_PCM_IOCTL_INFO: 3305 return snd_pcm_info_user(substream, arg); 3306 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 3307 return 0; 3308 case SNDRV_PCM_IOCTL_TTSTAMP: 3309 return snd_pcm_tstamp(substream, arg); 3310 case SNDRV_PCM_IOCTL_USER_PVERSION: 3311 if (get_user(pcm_file->user_pversion, 3312 (unsigned int __user *)arg)) 3313 return -EFAULT; 3314 return 0; 3315 case SNDRV_PCM_IOCTL_HW_REFINE: 3316 return snd_pcm_hw_refine_user(substream, arg); 3317 case SNDRV_PCM_IOCTL_HW_PARAMS: 3318 return snd_pcm_hw_params_user(substream, arg); 3319 case SNDRV_PCM_IOCTL_HW_FREE: 3320 return snd_pcm_hw_free(substream); 3321 case SNDRV_PCM_IOCTL_SW_PARAMS: 3322 return snd_pcm_sw_params_user(substream, arg); 3323 case SNDRV_PCM_IOCTL_STATUS32: 3324 return snd_pcm_status_user32(substream, arg, false); 3325 case SNDRV_PCM_IOCTL_STATUS_EXT32: 3326 return snd_pcm_status_user32(substream, arg, true); 3327 case SNDRV_PCM_IOCTL_STATUS64: 3328 return snd_pcm_status_user64(substream, arg, false); 3329 case SNDRV_PCM_IOCTL_STATUS_EXT64: 3330 return snd_pcm_status_user64(substream, arg, true); 3331 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 3332 return snd_pcm_channel_info_user(substream, arg); 3333 case SNDRV_PCM_IOCTL_PREPARE: 3334 return snd_pcm_prepare(substream, file); 3335 case SNDRV_PCM_IOCTL_RESET: 3336 return snd_pcm_reset(substream); 3337 case SNDRV_PCM_IOCTL_START: 3338 return snd_pcm_start_lock_irq(substream); 3339 case SNDRV_PCM_IOCTL_LINK: 3340 return snd_pcm_link(substream, (int)(unsigned long) arg); 3341 case SNDRV_PCM_IOCTL_UNLINK: 3342 return snd_pcm_unlink(substream); 3343 case SNDRV_PCM_IOCTL_RESUME: 3344 return snd_pcm_resume(substream); 3345 case SNDRV_PCM_IOCTL_XRUN: 3346 return snd_pcm_xrun(substream); 3347 case SNDRV_PCM_IOCTL_HWSYNC: 3348 return snd_pcm_hwsync(substream); 3349 case SNDRV_PCM_IOCTL_DELAY: 3350 { 3351 snd_pcm_sframes_t delay = 0; 3352 snd_pcm_sframes_t __user *res = arg; 3353 int err; 3354 3355 err = snd_pcm_delay(substream, &delay); 3356 if (err) 3357 return err; 3358 if (put_user(delay, res)) 3359 return -EFAULT; 3360 return 0; 3361 } 3362 case __SNDRV_PCM_IOCTL_SYNC_PTR32: 3363 return snd_pcm_ioctl_sync_ptr_compat(substream, arg); 3364 case __SNDRV_PCM_IOCTL_SYNC_PTR64: 3365 return snd_pcm_sync_ptr(substream, arg); 3366 #ifdef CONFIG_SND_SUPPORT_OLD_API 3367 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 3368 return snd_pcm_hw_refine_old_user(substream, arg); 3369 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 3370 return snd_pcm_hw_params_old_user(substream, arg); 3371 #endif 3372 case SNDRV_PCM_IOCTL_DRAIN: 3373 return snd_pcm_drain(substream, file); 3374 case SNDRV_PCM_IOCTL_DROP: 3375 return snd_pcm_drop(substream); 3376 case SNDRV_PCM_IOCTL_PAUSE: 3377 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg); 3378 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3379 case SNDRV_PCM_IOCTL_READI_FRAMES: 3380 return snd_pcm_xferi_frames_ioctl(substream, arg); 3381 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3382 case SNDRV_PCM_IOCTL_READN_FRAMES: 3383 return snd_pcm_xfern_frames_ioctl(substream, arg); 3384 case SNDRV_PCM_IOCTL_REWIND: 3385 return snd_pcm_rewind_ioctl(substream, arg); 3386 case SNDRV_PCM_IOCTL_FORWARD: 3387 return snd_pcm_forward_ioctl(substream, arg); 3388 } 3389 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3390 return -ENOTTY; 3391 } 3392 3393 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3394 unsigned long arg) 3395 { 3396 struct snd_pcm_file *pcm_file; 3397 3398 pcm_file = file->private_data; 3399 3400 if (((cmd >> 8) & 0xff) != 'A') 3401 return -ENOTTY; 3402 3403 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3404 (void __user *)arg); 3405 } 3406 3407 /** 3408 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3409 * @substream: PCM substream 3410 * @cmd: IOCTL cmd 3411 * @arg: IOCTL argument 3412 * 3413 * The function is provided primarily for OSS layer and USB gadget drivers, 3414 * and it allows only the limited set of ioctls (hw_params, sw_params, 3415 * prepare, start, drain, drop, forward). 3416 * 3417 * Return: zero if successful, or a negative error code 3418 */ 3419 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3420 unsigned int cmd, void *arg) 3421 { 3422 snd_pcm_uframes_t *frames = arg; 3423 snd_pcm_sframes_t result; 3424 3425 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3426 return -EBADFD; 3427 3428 switch (cmd) { 3429 case SNDRV_PCM_IOCTL_FORWARD: 3430 { 3431 /* provided only for OSS; capture-only and no value returned */ 3432 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3433 return -EINVAL; 3434 result = snd_pcm_forward(substream, *frames); 3435 return result < 0 ? result : 0; 3436 } 3437 case SNDRV_PCM_IOCTL_HW_PARAMS: 3438 return snd_pcm_hw_params(substream, arg); 3439 case SNDRV_PCM_IOCTL_SW_PARAMS: 3440 return snd_pcm_sw_params(substream, arg); 3441 case SNDRV_PCM_IOCTL_PREPARE: 3442 return snd_pcm_prepare(substream, NULL); 3443 case SNDRV_PCM_IOCTL_START: 3444 return snd_pcm_start_lock_irq(substream); 3445 case SNDRV_PCM_IOCTL_DRAIN: 3446 return snd_pcm_drain(substream, NULL); 3447 case SNDRV_PCM_IOCTL_DROP: 3448 return snd_pcm_drop(substream); 3449 case SNDRV_PCM_IOCTL_DELAY: 3450 return snd_pcm_delay(substream, frames); 3451 default: 3452 return -EINVAL; 3453 } 3454 } 3455 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3456 3457 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3458 loff_t * offset) 3459 { 3460 struct snd_pcm_file *pcm_file; 3461 struct snd_pcm_substream *substream; 3462 struct snd_pcm_runtime *runtime; 3463 snd_pcm_sframes_t result; 3464 3465 pcm_file = file->private_data; 3466 substream = pcm_file->substream; 3467 if (PCM_RUNTIME_CHECK(substream)) 3468 return -ENXIO; 3469 runtime = substream->runtime; 3470 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3471 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3472 return -EBADFD; 3473 if (!frame_aligned(runtime, count)) 3474 return -EINVAL; 3475 count = bytes_to_frames(runtime, count); 3476 result = snd_pcm_lib_read(substream, buf, count); 3477 if (result > 0) 3478 result = frames_to_bytes(runtime, result); 3479 return result; 3480 } 3481 3482 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3483 size_t count, loff_t * offset) 3484 { 3485 struct snd_pcm_file *pcm_file; 3486 struct snd_pcm_substream *substream; 3487 struct snd_pcm_runtime *runtime; 3488 snd_pcm_sframes_t result; 3489 3490 pcm_file = file->private_data; 3491 substream = pcm_file->substream; 3492 if (PCM_RUNTIME_CHECK(substream)) 3493 return -ENXIO; 3494 runtime = substream->runtime; 3495 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3496 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3497 return -EBADFD; 3498 if (!frame_aligned(runtime, count)) 3499 return -EINVAL; 3500 count = bytes_to_frames(runtime, count); 3501 result = snd_pcm_lib_write(substream, buf, count); 3502 if (result > 0) 3503 result = frames_to_bytes(runtime, result); 3504 return result; 3505 } 3506 3507 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3508 { 3509 struct snd_pcm_file *pcm_file; 3510 struct snd_pcm_substream *substream; 3511 struct snd_pcm_runtime *runtime; 3512 snd_pcm_sframes_t result; 3513 unsigned long i; 3514 void __user **bufs; 3515 snd_pcm_uframes_t frames; 3516 3517 pcm_file = iocb->ki_filp->private_data; 3518 substream = pcm_file->substream; 3519 if (PCM_RUNTIME_CHECK(substream)) 3520 return -ENXIO; 3521 runtime = substream->runtime; 3522 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3523 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3524 return -EBADFD; 3525 if (!iter_is_iovec(to)) 3526 return -EINVAL; 3527 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3528 return -EINVAL; 3529 if (!frame_aligned(runtime, to->iov->iov_len)) 3530 return -EINVAL; 3531 frames = bytes_to_samples(runtime, to->iov->iov_len); 3532 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3533 if (bufs == NULL) 3534 return -ENOMEM; 3535 for (i = 0; i < to->nr_segs; ++i) 3536 bufs[i] = to->iov[i].iov_base; 3537 result = snd_pcm_lib_readv(substream, bufs, frames); 3538 if (result > 0) 3539 result = frames_to_bytes(runtime, result); 3540 kfree(bufs); 3541 return result; 3542 } 3543 3544 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3545 { 3546 struct snd_pcm_file *pcm_file; 3547 struct snd_pcm_substream *substream; 3548 struct snd_pcm_runtime *runtime; 3549 snd_pcm_sframes_t result; 3550 unsigned long i; 3551 void __user **bufs; 3552 snd_pcm_uframes_t frames; 3553 3554 pcm_file = iocb->ki_filp->private_data; 3555 substream = pcm_file->substream; 3556 if (PCM_RUNTIME_CHECK(substream)) 3557 return -ENXIO; 3558 runtime = substream->runtime; 3559 if (runtime->state == SNDRV_PCM_STATE_OPEN || 3560 runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3561 return -EBADFD; 3562 if (!iter_is_iovec(from)) 3563 return -EINVAL; 3564 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3565 !frame_aligned(runtime, from->iov->iov_len)) 3566 return -EINVAL; 3567 frames = bytes_to_samples(runtime, from->iov->iov_len); 3568 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3569 if (bufs == NULL) 3570 return -ENOMEM; 3571 for (i = 0; i < from->nr_segs; ++i) 3572 bufs[i] = from->iov[i].iov_base; 3573 result = snd_pcm_lib_writev(substream, bufs, frames); 3574 if (result > 0) 3575 result = frames_to_bytes(runtime, result); 3576 kfree(bufs); 3577 return result; 3578 } 3579 3580 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3581 { 3582 struct snd_pcm_file *pcm_file; 3583 struct snd_pcm_substream *substream; 3584 struct snd_pcm_runtime *runtime; 3585 __poll_t mask, ok; 3586 snd_pcm_uframes_t avail; 3587 3588 pcm_file = file->private_data; 3589 3590 substream = pcm_file->substream; 3591 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3592 ok = EPOLLOUT | EPOLLWRNORM; 3593 else 3594 ok = EPOLLIN | EPOLLRDNORM; 3595 if (PCM_RUNTIME_CHECK(substream)) 3596 return ok | EPOLLERR; 3597 3598 runtime = substream->runtime; 3599 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3600 return ok | EPOLLERR; 3601 3602 poll_wait(file, &runtime->sleep, wait); 3603 3604 mask = 0; 3605 snd_pcm_stream_lock_irq(substream); 3606 avail = snd_pcm_avail(substream); 3607 switch (runtime->state) { 3608 case SNDRV_PCM_STATE_RUNNING: 3609 case SNDRV_PCM_STATE_PREPARED: 3610 case SNDRV_PCM_STATE_PAUSED: 3611 if (avail >= runtime->control->avail_min) 3612 mask = ok; 3613 break; 3614 case SNDRV_PCM_STATE_DRAINING: 3615 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3616 mask = ok; 3617 if (!avail) 3618 mask |= EPOLLERR; 3619 } 3620 break; 3621 default: 3622 mask = ok | EPOLLERR; 3623 break; 3624 } 3625 snd_pcm_stream_unlock_irq(substream); 3626 return mask; 3627 } 3628 3629 /* 3630 * mmap support 3631 */ 3632 3633 /* 3634 * Only on coherent architectures, we can mmap the status and the control records 3635 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3636 */ 3637 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3638 /* 3639 * mmap status record 3640 */ 3641 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3642 { 3643 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3644 struct snd_pcm_runtime *runtime; 3645 3646 if (substream == NULL) 3647 return VM_FAULT_SIGBUS; 3648 runtime = substream->runtime; 3649 vmf->page = virt_to_page(runtime->status); 3650 get_page(vmf->page); 3651 return 0; 3652 } 3653 3654 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3655 { 3656 .fault = snd_pcm_mmap_status_fault, 3657 }; 3658 3659 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3660 struct vm_area_struct *area) 3661 { 3662 long size; 3663 if (!(area->vm_flags & VM_READ)) 3664 return -EINVAL; 3665 size = area->vm_end - area->vm_start; 3666 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3667 return -EINVAL; 3668 area->vm_ops = &snd_pcm_vm_ops_status; 3669 area->vm_private_data = substream; 3670 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3671 area->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 3672 return 0; 3673 } 3674 3675 /* 3676 * mmap control record 3677 */ 3678 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3679 { 3680 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3681 struct snd_pcm_runtime *runtime; 3682 3683 if (substream == NULL) 3684 return VM_FAULT_SIGBUS; 3685 runtime = substream->runtime; 3686 vmf->page = virt_to_page(runtime->control); 3687 get_page(vmf->page); 3688 return 0; 3689 } 3690 3691 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3692 { 3693 .fault = snd_pcm_mmap_control_fault, 3694 }; 3695 3696 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3697 struct vm_area_struct *area) 3698 { 3699 long size; 3700 if (!(area->vm_flags & VM_READ)) 3701 return -EINVAL; 3702 size = area->vm_end - area->vm_start; 3703 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3704 return -EINVAL; 3705 area->vm_ops = &snd_pcm_vm_ops_control; 3706 area->vm_private_data = substream; 3707 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3708 return 0; 3709 } 3710 3711 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3712 { 3713 /* If drivers require the explicit sync (typically for non-coherent 3714 * pages), we have to disable the mmap of status and control data 3715 * to enforce the control via SYNC_PTR ioctl. 3716 */ 3717 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC) 3718 return false; 3719 /* See pcm_control_mmap_allowed() below. 3720 * Since older alsa-lib requires both status and control mmaps to be 3721 * coupled, we have to disable the status mmap for old alsa-lib, too. 3722 */ 3723 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3724 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3725 return false; 3726 return true; 3727 } 3728 3729 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3730 { 3731 if (pcm_file->no_compat_mmap) 3732 return false; 3733 /* see above */ 3734 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC) 3735 return false; 3736 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3737 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3738 * thus it effectively assures the manual update of appl_ptr. 3739 */ 3740 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3741 return false; 3742 return true; 3743 } 3744 3745 #else /* ! coherent mmap */ 3746 /* 3747 * don't support mmap for status and control records. 3748 */ 3749 #define pcm_status_mmap_allowed(pcm_file) false 3750 #define pcm_control_mmap_allowed(pcm_file) false 3751 3752 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3753 struct vm_area_struct *area) 3754 { 3755 return -ENXIO; 3756 } 3757 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3758 struct vm_area_struct *area) 3759 { 3760 return -ENXIO; 3761 } 3762 #endif /* coherent mmap */ 3763 3764 /* 3765 * fault callback for mmapping a RAM page 3766 */ 3767 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3768 { 3769 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3770 struct snd_pcm_runtime *runtime; 3771 unsigned long offset; 3772 struct page * page; 3773 size_t dma_bytes; 3774 3775 if (substream == NULL) 3776 return VM_FAULT_SIGBUS; 3777 runtime = substream->runtime; 3778 offset = vmf->pgoff << PAGE_SHIFT; 3779 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3780 if (offset > dma_bytes - PAGE_SIZE) 3781 return VM_FAULT_SIGBUS; 3782 if (substream->ops->page) 3783 page = substream->ops->page(substream, offset); 3784 else if (!snd_pcm_get_dma_buf(substream)) 3785 page = virt_to_page(runtime->dma_area + offset); 3786 else 3787 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset); 3788 if (!page) 3789 return VM_FAULT_SIGBUS; 3790 get_page(page); 3791 vmf->page = page; 3792 return 0; 3793 } 3794 3795 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3796 .open = snd_pcm_mmap_data_open, 3797 .close = snd_pcm_mmap_data_close, 3798 }; 3799 3800 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3801 .open = snd_pcm_mmap_data_open, 3802 .close = snd_pcm_mmap_data_close, 3803 .fault = snd_pcm_mmap_data_fault, 3804 }; 3805 3806 /* 3807 * mmap the DMA buffer on RAM 3808 */ 3809 3810 /** 3811 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3812 * @substream: PCM substream 3813 * @area: VMA 3814 * 3815 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3816 * this function is invoked implicitly. 3817 * 3818 * Return: zero if successful, or a negative error code 3819 */ 3820 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3821 struct vm_area_struct *area) 3822 { 3823 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3824 if (!substream->ops->page && 3825 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area)) 3826 return 0; 3827 /* mmap with fault handler */ 3828 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3829 return 0; 3830 } 3831 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3832 3833 /* 3834 * mmap the DMA buffer on I/O memory area 3835 */ 3836 #if SNDRV_PCM_INFO_MMAP_IOMEM 3837 /** 3838 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3839 * @substream: PCM substream 3840 * @area: VMA 3841 * 3842 * When your hardware uses the iomapped pages as the hardware buffer and 3843 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3844 * is supposed to work only on limited architectures. 3845 * 3846 * Return: zero if successful, or a negative error code 3847 */ 3848 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3849 struct vm_area_struct *area) 3850 { 3851 struct snd_pcm_runtime *runtime = substream->runtime; 3852 3853 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3854 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3855 } 3856 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3857 #endif /* SNDRV_PCM_INFO_MMAP */ 3858 3859 /* 3860 * mmap DMA buffer 3861 */ 3862 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3863 struct vm_area_struct *area) 3864 { 3865 struct snd_pcm_runtime *runtime; 3866 long size; 3867 unsigned long offset; 3868 size_t dma_bytes; 3869 int err; 3870 3871 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3872 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3873 return -EINVAL; 3874 } else { 3875 if (!(area->vm_flags & VM_READ)) 3876 return -EINVAL; 3877 } 3878 runtime = substream->runtime; 3879 if (runtime->state == SNDRV_PCM_STATE_OPEN) 3880 return -EBADFD; 3881 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3882 return -ENXIO; 3883 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3884 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3885 return -EINVAL; 3886 size = area->vm_end - area->vm_start; 3887 offset = area->vm_pgoff << PAGE_SHIFT; 3888 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3889 if ((size_t)size > dma_bytes) 3890 return -EINVAL; 3891 if (offset > dma_bytes - size) 3892 return -EINVAL; 3893 3894 area->vm_ops = &snd_pcm_vm_ops_data; 3895 area->vm_private_data = substream; 3896 if (substream->ops->mmap) 3897 err = substream->ops->mmap(substream, area); 3898 else 3899 err = snd_pcm_lib_default_mmap(substream, area); 3900 if (!err) 3901 atomic_inc(&substream->mmap_count); 3902 return err; 3903 } 3904 EXPORT_SYMBOL(snd_pcm_mmap_data); 3905 3906 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3907 { 3908 struct snd_pcm_file * pcm_file; 3909 struct snd_pcm_substream *substream; 3910 unsigned long offset; 3911 3912 pcm_file = file->private_data; 3913 substream = pcm_file->substream; 3914 if (PCM_RUNTIME_CHECK(substream)) 3915 return -ENXIO; 3916 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3917 return -EBADFD; 3918 3919 offset = area->vm_pgoff << PAGE_SHIFT; 3920 switch (offset) { 3921 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD: 3922 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3923 return -ENXIO; 3924 fallthrough; 3925 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 3926 if (!pcm_status_mmap_allowed(pcm_file)) 3927 return -ENXIO; 3928 return snd_pcm_mmap_status(substream, file, area); 3929 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD: 3930 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3931 return -ENXIO; 3932 fallthrough; 3933 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 3934 if (!pcm_control_mmap_allowed(pcm_file)) 3935 return -ENXIO; 3936 return snd_pcm_mmap_control(substream, file, area); 3937 default: 3938 return snd_pcm_mmap_data(substream, file, area); 3939 } 3940 return 0; 3941 } 3942 3943 static int snd_pcm_fasync(int fd, struct file * file, int on) 3944 { 3945 struct snd_pcm_file * pcm_file; 3946 struct snd_pcm_substream *substream; 3947 struct snd_pcm_runtime *runtime; 3948 3949 pcm_file = file->private_data; 3950 substream = pcm_file->substream; 3951 if (PCM_RUNTIME_CHECK(substream)) 3952 return -ENXIO; 3953 runtime = substream->runtime; 3954 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED) 3955 return -EBADFD; 3956 return snd_fasync_helper(fd, file, on, &runtime->fasync); 3957 } 3958 3959 /* 3960 * ioctl32 compat 3961 */ 3962 #ifdef CONFIG_COMPAT 3963 #include "pcm_compat.c" 3964 #else 3965 #define snd_pcm_ioctl_compat NULL 3966 #endif 3967 3968 /* 3969 * To be removed helpers to keep binary compatibility 3970 */ 3971 3972 #ifdef CONFIG_SND_SUPPORT_OLD_API 3973 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3974 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3975 3976 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3977 struct snd_pcm_hw_params_old *oparams) 3978 { 3979 unsigned int i; 3980 3981 memset(params, 0, sizeof(*params)); 3982 params->flags = oparams->flags; 3983 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3984 params->masks[i].bits[0] = oparams->masks[i]; 3985 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3986 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3987 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3988 params->info = oparams->info; 3989 params->msbits = oparams->msbits; 3990 params->rate_num = oparams->rate_num; 3991 params->rate_den = oparams->rate_den; 3992 params->fifo_size = oparams->fifo_size; 3993 } 3994 3995 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3996 struct snd_pcm_hw_params *params) 3997 { 3998 unsigned int i; 3999 4000 memset(oparams, 0, sizeof(*oparams)); 4001 oparams->flags = params->flags; 4002 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 4003 oparams->masks[i] = params->masks[i].bits[0]; 4004 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 4005 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 4006 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 4007 oparams->info = params->info; 4008 oparams->msbits = params->msbits; 4009 oparams->rate_num = params->rate_num; 4010 oparams->rate_den = params->rate_den; 4011 oparams->fifo_size = params->fifo_size; 4012 } 4013 4014 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 4015 struct snd_pcm_hw_params_old __user * _oparams) 4016 { 4017 struct snd_pcm_hw_params *params; 4018 struct snd_pcm_hw_params_old *oparams = NULL; 4019 int err; 4020 4021 params = kmalloc(sizeof(*params), GFP_KERNEL); 4022 if (!params) 4023 return -ENOMEM; 4024 4025 oparams = memdup_user(_oparams, sizeof(*oparams)); 4026 if (IS_ERR(oparams)) { 4027 err = PTR_ERR(oparams); 4028 goto out; 4029 } 4030 snd_pcm_hw_convert_from_old_params(params, oparams); 4031 err = snd_pcm_hw_refine(substream, params); 4032 if (err < 0) 4033 goto out_old; 4034 4035 err = fixup_unreferenced_params(substream, params); 4036 if (err < 0) 4037 goto out_old; 4038 4039 snd_pcm_hw_convert_to_old_params(oparams, params); 4040 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 4041 err = -EFAULT; 4042 out_old: 4043 kfree(oparams); 4044 out: 4045 kfree(params); 4046 return err; 4047 } 4048 4049 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 4050 struct snd_pcm_hw_params_old __user * _oparams) 4051 { 4052 struct snd_pcm_hw_params *params; 4053 struct snd_pcm_hw_params_old *oparams = NULL; 4054 int err; 4055 4056 params = kmalloc(sizeof(*params), GFP_KERNEL); 4057 if (!params) 4058 return -ENOMEM; 4059 4060 oparams = memdup_user(_oparams, sizeof(*oparams)); 4061 if (IS_ERR(oparams)) { 4062 err = PTR_ERR(oparams); 4063 goto out; 4064 } 4065 4066 snd_pcm_hw_convert_from_old_params(params, oparams); 4067 err = snd_pcm_hw_params(substream, params); 4068 if (err < 0) 4069 goto out_old; 4070 4071 snd_pcm_hw_convert_to_old_params(oparams, params); 4072 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 4073 err = -EFAULT; 4074 out_old: 4075 kfree(oparams); 4076 out: 4077 kfree(params); 4078 return err; 4079 } 4080 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 4081 4082 #ifndef CONFIG_MMU 4083 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 4084 unsigned long addr, 4085 unsigned long len, 4086 unsigned long pgoff, 4087 unsigned long flags) 4088 { 4089 struct snd_pcm_file *pcm_file = file->private_data; 4090 struct snd_pcm_substream *substream = pcm_file->substream; 4091 struct snd_pcm_runtime *runtime = substream->runtime; 4092 unsigned long offset = pgoff << PAGE_SHIFT; 4093 4094 switch (offset) { 4095 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 4096 return (unsigned long)runtime->status; 4097 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 4098 return (unsigned long)runtime->control; 4099 default: 4100 return (unsigned long)runtime->dma_area + offset; 4101 } 4102 } 4103 #else 4104 # define snd_pcm_get_unmapped_area NULL 4105 #endif 4106 4107 /* 4108 * Register section 4109 */ 4110 4111 const struct file_operations snd_pcm_f_ops[2] = { 4112 { 4113 .owner = THIS_MODULE, 4114 .write = snd_pcm_write, 4115 .write_iter = snd_pcm_writev, 4116 .open = snd_pcm_playback_open, 4117 .release = snd_pcm_release, 4118 .llseek = no_llseek, 4119 .poll = snd_pcm_poll, 4120 .unlocked_ioctl = snd_pcm_ioctl, 4121 .compat_ioctl = snd_pcm_ioctl_compat, 4122 .mmap = snd_pcm_mmap, 4123 .fasync = snd_pcm_fasync, 4124 .get_unmapped_area = snd_pcm_get_unmapped_area, 4125 }, 4126 { 4127 .owner = THIS_MODULE, 4128 .read = snd_pcm_read, 4129 .read_iter = snd_pcm_readv, 4130 .open = snd_pcm_capture_open, 4131 .release = snd_pcm_release, 4132 .llseek = no_llseek, 4133 .poll = snd_pcm_poll, 4134 .unlocked_ioctl = snd_pcm_ioctl, 4135 .compat_ioctl = snd_pcm_ioctl_compat, 4136 .mmap = snd_pcm_mmap, 4137 .fasync = snd_pcm_fasync, 4138 .get_unmapped_area = snd_pcm_get_unmapped_area, 4139 } 4140 }; 4141