1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Digital Audio (PCM) abstract layer 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 */ 6 7 #include <linux/compat.h> 8 #include <linux/mm.h> 9 #include <linux/module.h> 10 #include <linux/file.h> 11 #include <linux/slab.h> 12 #include <linux/sched/signal.h> 13 #include <linux/time.h> 14 #include <linux/pm_qos.h> 15 #include <linux/io.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/vmalloc.h> 18 #include <sound/core.h> 19 #include <sound/control.h> 20 #include <sound/info.h> 21 #include <sound/pcm.h> 22 #include <sound/pcm_params.h> 23 #include <sound/timer.h> 24 #include <sound/minors.h> 25 #include <linux/uio.h> 26 #include <linux/delay.h> 27 28 #include "pcm_local.h" 29 30 #ifdef CONFIG_SND_DEBUG 31 #define CREATE_TRACE_POINTS 32 #include "pcm_param_trace.h" 33 #else 34 #define trace_hw_mask_param_enabled() 0 35 #define trace_hw_interval_param_enabled() 0 36 #define trace_hw_mask_param(substream, type, index, prev, curr) 37 #define trace_hw_interval_param(substream, type, index, prev, curr) 38 #endif 39 40 /* 41 * Compatibility 42 */ 43 44 struct snd_pcm_hw_params_old { 45 unsigned int flags; 46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 47 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 50 unsigned int rmask; 51 unsigned int cmask; 52 unsigned int info; 53 unsigned int msbits; 54 unsigned int rate_num; 55 unsigned int rate_den; 56 snd_pcm_uframes_t fifo_size; 57 unsigned char reserved[64]; 58 }; 59 60 #ifdef CONFIG_SND_SUPPORT_OLD_API 61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 63 64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 65 struct snd_pcm_hw_params_old __user * _oparams); 66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params_old __user * _oparams); 68 #endif 69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 70 71 /* 72 * 73 */ 74 75 static DECLARE_RWSEM(snd_pcm_link_rwsem); 76 77 void snd_pcm_group_init(struct snd_pcm_group *group) 78 { 79 spin_lock_init(&group->lock); 80 mutex_init(&group->mutex); 81 INIT_LIST_HEAD(&group->substreams); 82 refcount_set(&group->refs, 1); 83 } 84 85 /* define group lock helpers */ 86 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ 87 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ 88 { \ 89 if (nonatomic) \ 90 mutex_ ## mutex_action(&group->mutex); \ 91 else \ 92 spin_ ## action(&group->lock); \ 93 } 94 95 DEFINE_PCM_GROUP_LOCK(lock, lock); 96 DEFINE_PCM_GROUP_LOCK(unlock, unlock); 97 DEFINE_PCM_GROUP_LOCK(lock_irq, lock); 98 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); 99 100 /** 101 * snd_pcm_stream_lock - Lock the PCM stream 102 * @substream: PCM substream 103 * 104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic 105 * flag of the given substream. This also takes the global link rw lock 106 * (or rw sem), too, for avoiding the race with linked streams. 107 */ 108 void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 109 { 110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); 111 } 112 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); 113 114 /** 115 * snd_pcm_stream_unlock - Unlock the PCM stream 116 * @substream: PCM substream 117 * 118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). 119 */ 120 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 121 { 122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); 123 } 124 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); 125 126 /** 127 * snd_pcm_stream_lock_irq - Lock the PCM stream 128 * @substream: PCM substream 129 * 130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local 131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 132 * as snd_pcm_stream_lock(). 133 */ 134 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 135 { 136 snd_pcm_group_lock_irq(&substream->self_group, 137 substream->pcm->nonatomic); 138 } 139 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); 140 141 static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream) 142 { 143 struct snd_pcm_group *group = &substream->self_group; 144 145 if (substream->pcm->nonatomic) 146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING); 147 else 148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING); 149 } 150 151 /** 152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream 153 * @substream: PCM substream 154 * 155 * This is a counter-part of snd_pcm_stream_lock_irq(). 156 */ 157 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 158 { 159 snd_pcm_group_unlock_irq(&substream->self_group, 160 substream->pcm->nonatomic); 161 } 162 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); 163 164 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) 165 { 166 unsigned long flags = 0; 167 if (substream->pcm->nonatomic) 168 mutex_lock(&substream->self_group.mutex); 169 else 170 spin_lock_irqsave(&substream->self_group.lock, flags); 171 return flags; 172 } 173 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); 174 175 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream) 176 { 177 unsigned long flags = 0; 178 if (substream->pcm->nonatomic) 179 mutex_lock_nested(&substream->self_group.mutex, 180 SINGLE_DEPTH_NESTING); 181 else 182 spin_lock_irqsave_nested(&substream->self_group.lock, flags, 183 SINGLE_DEPTH_NESTING); 184 return flags; 185 } 186 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested); 187 188 /** 189 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream 190 * @substream: PCM substream 191 * @flags: irq flags 192 * 193 * This is a counter-part of snd_pcm_stream_lock_irqsave(). 194 */ 195 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 196 unsigned long flags) 197 { 198 if (substream->pcm->nonatomic) 199 mutex_unlock(&substream->self_group.mutex); 200 else 201 spin_unlock_irqrestore(&substream->self_group.lock, flags); 202 } 203 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); 204 205 /* Run PCM ioctl ops */ 206 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream, 207 unsigned cmd, void *arg) 208 { 209 if (substream->ops->ioctl) 210 return substream->ops->ioctl(substream, cmd, arg); 211 else 212 return snd_pcm_lib_ioctl(substream, cmd, arg); 213 } 214 215 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 216 { 217 struct snd_pcm *pcm = substream->pcm; 218 struct snd_pcm_str *pstr = substream->pstr; 219 220 memset(info, 0, sizeof(*info)); 221 info->card = pcm->card->number; 222 info->device = pcm->device; 223 info->stream = substream->stream; 224 info->subdevice = substream->number; 225 strscpy(info->id, pcm->id, sizeof(info->id)); 226 strscpy(info->name, pcm->name, sizeof(info->name)); 227 info->dev_class = pcm->dev_class; 228 info->dev_subclass = pcm->dev_subclass; 229 info->subdevices_count = pstr->substream_count; 230 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 231 strscpy(info->subname, substream->name, sizeof(info->subname)); 232 233 return 0; 234 } 235 236 int snd_pcm_info_user(struct snd_pcm_substream *substream, 237 struct snd_pcm_info __user * _info) 238 { 239 struct snd_pcm_info *info; 240 int err; 241 242 info = kmalloc(sizeof(*info), GFP_KERNEL); 243 if (! info) 244 return -ENOMEM; 245 err = snd_pcm_info(substream, info); 246 if (err >= 0) { 247 if (copy_to_user(_info, info, sizeof(*info))) 248 err = -EFAULT; 249 } 250 kfree(info); 251 return err; 252 } 253 254 /* macro for simplified cast */ 255 #define PARAM_MASK_BIT(b) (1U << (__force int)(b)) 256 257 static bool hw_support_mmap(struct snd_pcm_substream *substream) 258 { 259 struct snd_dma_buffer *dmabuf; 260 261 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) 262 return false; 263 264 if (substream->ops->mmap || substream->ops->page) 265 return true; 266 267 dmabuf = snd_pcm_get_dma_buf(substream); 268 if (!dmabuf) 269 dmabuf = &substream->dma_buffer; 270 switch (dmabuf->dev.type) { 271 case SNDRV_DMA_TYPE_UNKNOWN: 272 /* we can't know the device, so just assume that the driver does 273 * everything right 274 */ 275 return true; 276 case SNDRV_DMA_TYPE_CONTINUOUS: 277 case SNDRV_DMA_TYPE_VMALLOC: 278 return true; 279 default: 280 return dma_can_mmap(dmabuf->dev.dev); 281 } 282 } 283 284 static int constrain_mask_params(struct snd_pcm_substream *substream, 285 struct snd_pcm_hw_params *params) 286 { 287 struct snd_pcm_hw_constraints *constrs = 288 &substream->runtime->hw_constraints; 289 struct snd_mask *m; 290 unsigned int k; 291 struct snd_mask old_mask; 292 int changed; 293 294 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 295 m = hw_param_mask(params, k); 296 if (snd_mask_empty(m)) 297 return -EINVAL; 298 299 /* This parameter is not requested to change by a caller. */ 300 if (!(params->rmask & PARAM_MASK_BIT(k))) 301 continue; 302 303 if (trace_hw_mask_param_enabled()) 304 old_mask = *m; 305 306 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 307 if (changed < 0) 308 return changed; 309 if (changed == 0) 310 continue; 311 312 /* Set corresponding flag so that the caller gets it. */ 313 trace_hw_mask_param(substream, k, 0, &old_mask, m); 314 params->cmask |= PARAM_MASK_BIT(k); 315 } 316 317 return 0; 318 } 319 320 static int constrain_interval_params(struct snd_pcm_substream *substream, 321 struct snd_pcm_hw_params *params) 322 { 323 struct snd_pcm_hw_constraints *constrs = 324 &substream->runtime->hw_constraints; 325 struct snd_interval *i; 326 unsigned int k; 327 struct snd_interval old_interval; 328 int changed; 329 330 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 331 i = hw_param_interval(params, k); 332 if (snd_interval_empty(i)) 333 return -EINVAL; 334 335 /* This parameter is not requested to change by a caller. */ 336 if (!(params->rmask & PARAM_MASK_BIT(k))) 337 continue; 338 339 if (trace_hw_interval_param_enabled()) 340 old_interval = *i; 341 342 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 343 if (changed < 0) 344 return changed; 345 if (changed == 0) 346 continue; 347 348 /* Set corresponding flag so that the caller gets it. */ 349 trace_hw_interval_param(substream, k, 0, &old_interval, i); 350 params->cmask |= PARAM_MASK_BIT(k); 351 } 352 353 return 0; 354 } 355 356 static int constrain_params_by_rules(struct snd_pcm_substream *substream, 357 struct snd_pcm_hw_params *params) 358 { 359 struct snd_pcm_hw_constraints *constrs = 360 &substream->runtime->hw_constraints; 361 unsigned int k; 362 unsigned int *rstamps; 363 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 364 unsigned int stamp; 365 struct snd_pcm_hw_rule *r; 366 unsigned int d; 367 struct snd_mask old_mask; 368 struct snd_interval old_interval; 369 bool again; 370 int changed, err = 0; 371 372 /* 373 * Each application of rule has own sequence number. 374 * 375 * Each member of 'rstamps' array represents the sequence number of 376 * recent application of corresponding rule. 377 */ 378 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); 379 if (!rstamps) 380 return -ENOMEM; 381 382 /* 383 * Each member of 'vstamps' array represents the sequence number of 384 * recent application of rule in which corresponding parameters were 385 * changed. 386 * 387 * In initial state, elements corresponding to parameters requested by 388 * a caller is 1. For unrequested parameters, corresponding members 389 * have 0 so that the parameters are never changed anymore. 390 */ 391 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 392 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0; 393 394 /* Due to the above design, actual sequence number starts at 2. */ 395 stamp = 2; 396 retry: 397 /* Apply all rules in order. */ 398 again = false; 399 for (k = 0; k < constrs->rules_num; k++) { 400 r = &constrs->rules[k]; 401 402 /* 403 * Check condition bits of this rule. When the rule has 404 * some condition bits, parameter without the bits is 405 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP 406 * is an example of the condition bits. 407 */ 408 if (r->cond && !(r->cond & params->flags)) 409 continue; 410 411 /* 412 * The 'deps' array includes maximum four dependencies 413 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth 414 * member of this array is a sentinel and should be 415 * negative value. 416 * 417 * This rule should be processed in this time when dependent 418 * parameters were changed at former applications of the other 419 * rules. 420 */ 421 for (d = 0; r->deps[d] >= 0; d++) { 422 if (vstamps[r->deps[d]] > rstamps[k]) 423 break; 424 } 425 if (r->deps[d] < 0) 426 continue; 427 428 if (trace_hw_mask_param_enabled()) { 429 if (hw_is_mask(r->var)) 430 old_mask = *hw_param_mask(params, r->var); 431 } 432 if (trace_hw_interval_param_enabled()) { 433 if (hw_is_interval(r->var)) 434 old_interval = *hw_param_interval(params, r->var); 435 } 436 437 changed = r->func(params, r); 438 if (changed < 0) { 439 err = changed; 440 goto out; 441 } 442 443 /* 444 * When the parameter is changed, notify it to the caller 445 * by corresponding returned bit, then preparing for next 446 * iteration. 447 */ 448 if (changed && r->var >= 0) { 449 if (hw_is_mask(r->var)) { 450 trace_hw_mask_param(substream, r->var, 451 k + 1, &old_mask, 452 hw_param_mask(params, r->var)); 453 } 454 if (hw_is_interval(r->var)) { 455 trace_hw_interval_param(substream, r->var, 456 k + 1, &old_interval, 457 hw_param_interval(params, r->var)); 458 } 459 460 params->cmask |= PARAM_MASK_BIT(r->var); 461 vstamps[r->var] = stamp; 462 again = true; 463 } 464 465 rstamps[k] = stamp++; 466 } 467 468 /* Iterate to evaluate all rules till no parameters are changed. */ 469 if (again) 470 goto retry; 471 472 out: 473 kfree(rstamps); 474 return err; 475 } 476 477 static int fixup_unreferenced_params(struct snd_pcm_substream *substream, 478 struct snd_pcm_hw_params *params) 479 { 480 const struct snd_interval *i; 481 const struct snd_mask *m; 482 int err; 483 484 if (!params->msbits) { 485 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 486 if (snd_interval_single(i)) 487 params->msbits = snd_interval_value(i); 488 } 489 490 if (!params->rate_den) { 491 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 492 if (snd_interval_single(i)) { 493 params->rate_num = snd_interval_value(i); 494 params->rate_den = 1; 495 } 496 } 497 498 if (!params->fifo_size) { 499 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); 500 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 501 if (snd_mask_single(m) && snd_interval_single(i)) { 502 err = snd_pcm_ops_ioctl(substream, 503 SNDRV_PCM_IOCTL1_FIFO_SIZE, 504 params); 505 if (err < 0) 506 return err; 507 } 508 } 509 510 if (!params->info) { 511 params->info = substream->runtime->hw.info; 512 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | 513 SNDRV_PCM_INFO_DRAIN_TRIGGER); 514 if (!hw_support_mmap(substream)) 515 params->info &= ~(SNDRV_PCM_INFO_MMAP | 516 SNDRV_PCM_INFO_MMAP_VALID); 517 } 518 519 return 0; 520 } 521 522 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 523 struct snd_pcm_hw_params *params) 524 { 525 int err; 526 527 params->info = 0; 528 params->fifo_size = 0; 529 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 530 params->msbits = 0; 531 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) { 532 params->rate_num = 0; 533 params->rate_den = 0; 534 } 535 536 err = constrain_mask_params(substream, params); 537 if (err < 0) 538 return err; 539 540 err = constrain_interval_params(substream, params); 541 if (err < 0) 542 return err; 543 544 err = constrain_params_by_rules(substream, params); 545 if (err < 0) 546 return err; 547 548 params->rmask = 0; 549 550 return 0; 551 } 552 EXPORT_SYMBOL(snd_pcm_hw_refine); 553 554 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 555 struct snd_pcm_hw_params __user * _params) 556 { 557 struct snd_pcm_hw_params *params; 558 int err; 559 560 params = memdup_user(_params, sizeof(*params)); 561 if (IS_ERR(params)) 562 return PTR_ERR(params); 563 564 err = snd_pcm_hw_refine(substream, params); 565 if (err < 0) 566 goto end; 567 568 err = fixup_unreferenced_params(substream, params); 569 if (err < 0) 570 goto end; 571 572 if (copy_to_user(_params, params, sizeof(*params))) 573 err = -EFAULT; 574 end: 575 kfree(params); 576 return err; 577 } 578 579 static int period_to_usecs(struct snd_pcm_runtime *runtime) 580 { 581 int usecs; 582 583 if (! runtime->rate) 584 return -1; /* invalid */ 585 586 /* take 75% of period time as the deadline */ 587 usecs = (750000 / runtime->rate) * runtime->period_size; 588 usecs += ((750000 % runtime->rate) * runtime->period_size) / 589 runtime->rate; 590 591 return usecs; 592 } 593 594 static void snd_pcm_set_state(struct snd_pcm_substream *substream, 595 snd_pcm_state_t state) 596 { 597 snd_pcm_stream_lock_irq(substream); 598 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 599 substream->runtime->status->state = state; 600 snd_pcm_stream_unlock_irq(substream); 601 } 602 603 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, 604 int event) 605 { 606 #ifdef CONFIG_SND_PCM_TIMER 607 if (substream->timer) 608 snd_timer_notify(substream->timer, event, 609 &substream->runtime->trigger_tstamp); 610 #endif 611 } 612 613 void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq) 614 { 615 if (substream->runtime && substream->runtime->stop_operating) { 616 substream->runtime->stop_operating = false; 617 if (substream->ops && substream->ops->sync_stop) 618 substream->ops->sync_stop(substream); 619 else if (sync_irq && substream->pcm->card->sync_irq > 0) 620 synchronize_irq(substream->pcm->card->sync_irq); 621 } 622 } 623 624 /** 625 * snd_pcm_hw_params_choose - choose a configuration defined by @params 626 * @pcm: PCM instance 627 * @params: the hw_params instance 628 * 629 * Choose one configuration from configuration space defined by @params. 630 * The configuration chosen is that obtained fixing in this order: 631 * first access, first format, first subformat, min channels, 632 * min rate, min period time, max buffer size, min tick time 633 * 634 * Return: Zero if successful, or a negative error code on failure. 635 */ 636 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 637 struct snd_pcm_hw_params *params) 638 { 639 static const int vars[] = { 640 SNDRV_PCM_HW_PARAM_ACCESS, 641 SNDRV_PCM_HW_PARAM_FORMAT, 642 SNDRV_PCM_HW_PARAM_SUBFORMAT, 643 SNDRV_PCM_HW_PARAM_CHANNELS, 644 SNDRV_PCM_HW_PARAM_RATE, 645 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 646 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 647 SNDRV_PCM_HW_PARAM_TICK_TIME, 648 -1 649 }; 650 const int *v; 651 struct snd_mask old_mask; 652 struct snd_interval old_interval; 653 int changed; 654 655 for (v = vars; *v != -1; v++) { 656 /* Keep old parameter to trace. */ 657 if (trace_hw_mask_param_enabled()) { 658 if (hw_is_mask(*v)) 659 old_mask = *hw_param_mask(params, *v); 660 } 661 if (trace_hw_interval_param_enabled()) { 662 if (hw_is_interval(*v)) 663 old_interval = *hw_param_interval(params, *v); 664 } 665 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 666 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); 667 else 668 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); 669 if (changed < 0) 670 return changed; 671 if (changed == 0) 672 continue; 673 674 /* Trace the changed parameter. */ 675 if (hw_is_mask(*v)) { 676 trace_hw_mask_param(pcm, *v, 0, &old_mask, 677 hw_param_mask(params, *v)); 678 } 679 if (hw_is_interval(*v)) { 680 trace_hw_interval_param(pcm, *v, 0, &old_interval, 681 hw_param_interval(params, *v)); 682 } 683 } 684 685 return 0; 686 } 687 688 /* 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->status->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->status->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->status->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->status->state; 1017 status->suspended_state = runtime->status->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->status->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->status->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 runtime->status->state = 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->status->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->status->state != state) { 1510 snd_pcm_trigger_tstamp(substream); 1511 runtime->status->state = 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->status->state != SNDRV_PCM_STATE_RUNNING) 1588 return -EBADFD; 1589 } else if (runtime->status->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 runtime->status->state = 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 runtime->status->state = 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->status->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->status->suspended_state = runtime->status->state; 1703 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1704 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); 1705 wake_up(&runtime->sleep); 1706 wake_up(&runtime->tsleep); 1707 } 1708 1709 static const struct action_ops snd_pcm_action_suspend = { 1710 .pre_action = snd_pcm_pre_suspend, 1711 .do_action = snd_pcm_do_suspend, 1712 .post_action = snd_pcm_post_suspend 1713 }; 1714 1715 /* 1716 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1717 * @substream: the PCM substream 1718 * 1719 * After this call, all streams are changed to SUSPENDED state. 1720 * 1721 * Return: Zero if successful, or a negative error code. 1722 */ 1723 static int snd_pcm_suspend(struct snd_pcm_substream *substream) 1724 { 1725 int err; 1726 unsigned long flags; 1727 1728 snd_pcm_stream_lock_irqsave(substream, flags); 1729 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 1730 ACTION_ARG_IGNORE); 1731 snd_pcm_stream_unlock_irqrestore(substream, flags); 1732 return err; 1733 } 1734 1735 /** 1736 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1737 * @pcm: the PCM instance 1738 * 1739 * After this call, all streams are changed to SUSPENDED state. 1740 * 1741 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1742 */ 1743 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1744 { 1745 struct snd_pcm_substream *substream; 1746 int stream, err = 0; 1747 1748 if (! pcm) 1749 return 0; 1750 1751 for_each_pcm_substream(pcm, stream, substream) { 1752 /* FIXME: the open/close code should lock this as well */ 1753 if (!substream->runtime) 1754 continue; 1755 1756 /* 1757 * Skip BE dai link PCM's that are internal and may 1758 * not have their substream ops set. 1759 */ 1760 if (!substream->ops) 1761 continue; 1762 1763 err = snd_pcm_suspend(substream); 1764 if (err < 0 && err != -EBUSY) 1765 return err; 1766 } 1767 1768 for_each_pcm_substream(pcm, stream, substream) 1769 snd_pcm_sync_stop(substream, false); 1770 1771 return 0; 1772 } 1773 EXPORT_SYMBOL(snd_pcm_suspend_all); 1774 1775 /* resume callbacks: state argument ignored */ 1776 1777 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, 1778 snd_pcm_state_t state) 1779 { 1780 struct snd_pcm_runtime *runtime = substream->runtime; 1781 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1782 return -ENOSYS; 1783 runtime->trigger_master = substream; 1784 return 0; 1785 } 1786 1787 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, 1788 snd_pcm_state_t state) 1789 { 1790 struct snd_pcm_runtime *runtime = substream->runtime; 1791 if (runtime->trigger_master != substream) 1792 return 0; 1793 /* DMA not running previously? */ 1794 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1795 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1796 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1797 return 0; 1798 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1799 } 1800 1801 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, 1802 snd_pcm_state_t state) 1803 { 1804 if (substream->runtime->trigger_master == substream && 1805 snd_pcm_running(substream)) 1806 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1807 } 1808 1809 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, 1810 snd_pcm_state_t state) 1811 { 1812 struct snd_pcm_runtime *runtime = substream->runtime; 1813 snd_pcm_trigger_tstamp(substream); 1814 runtime->status->state = runtime->status->suspended_state; 1815 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); 1816 } 1817 1818 static const struct action_ops snd_pcm_action_resume = { 1819 .pre_action = snd_pcm_pre_resume, 1820 .do_action = snd_pcm_do_resume, 1821 .undo_action = snd_pcm_undo_resume, 1822 .post_action = snd_pcm_post_resume 1823 }; 1824 1825 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1826 { 1827 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 1828 ACTION_ARG_IGNORE); 1829 } 1830 1831 #else 1832 1833 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1834 { 1835 return -ENOSYS; 1836 } 1837 1838 #endif /* CONFIG_PM */ 1839 1840 /* 1841 * xrun ioctl 1842 * 1843 * Change the RUNNING stream(s) to XRUN state. 1844 */ 1845 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1846 { 1847 struct snd_pcm_runtime *runtime = substream->runtime; 1848 int result; 1849 1850 snd_pcm_stream_lock_irq(substream); 1851 switch (runtime->status->state) { 1852 case SNDRV_PCM_STATE_XRUN: 1853 result = 0; /* already there */ 1854 break; 1855 case SNDRV_PCM_STATE_RUNNING: 1856 __snd_pcm_xrun(substream); 1857 result = 0; 1858 break; 1859 default: 1860 result = -EBADFD; 1861 } 1862 snd_pcm_stream_unlock_irq(substream); 1863 return result; 1864 } 1865 1866 /* 1867 * reset ioctl 1868 */ 1869 /* reset callbacks: state argument ignored */ 1870 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, 1871 snd_pcm_state_t state) 1872 { 1873 struct snd_pcm_runtime *runtime = substream->runtime; 1874 switch (runtime->status->state) { 1875 case SNDRV_PCM_STATE_RUNNING: 1876 case SNDRV_PCM_STATE_PREPARED: 1877 case SNDRV_PCM_STATE_PAUSED: 1878 case SNDRV_PCM_STATE_SUSPENDED: 1879 return 0; 1880 default: 1881 return -EBADFD; 1882 } 1883 } 1884 1885 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, 1886 snd_pcm_state_t state) 1887 { 1888 struct snd_pcm_runtime *runtime = substream->runtime; 1889 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1890 if (err < 0) 1891 return err; 1892 snd_pcm_stream_lock_irq(substream); 1893 runtime->hw_ptr_base = 0; 1894 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1895 runtime->status->hw_ptr % runtime->period_size; 1896 runtime->silence_start = runtime->status->hw_ptr; 1897 runtime->silence_filled = 0; 1898 snd_pcm_stream_unlock_irq(substream); 1899 return 0; 1900 } 1901 1902 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, 1903 snd_pcm_state_t state) 1904 { 1905 struct snd_pcm_runtime *runtime = substream->runtime; 1906 snd_pcm_stream_lock_irq(substream); 1907 runtime->control->appl_ptr = runtime->status->hw_ptr; 1908 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1909 runtime->silence_size > 0) 1910 snd_pcm_playback_silence(substream, ULONG_MAX); 1911 snd_pcm_stream_unlock_irq(substream); 1912 } 1913 1914 static const struct action_ops snd_pcm_action_reset = { 1915 .pre_action = snd_pcm_pre_reset, 1916 .do_action = snd_pcm_do_reset, 1917 .post_action = snd_pcm_post_reset 1918 }; 1919 1920 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1921 { 1922 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 1923 ACTION_ARG_IGNORE); 1924 } 1925 1926 /* 1927 * prepare ioctl 1928 */ 1929 /* pass f_flags as state argument */ 1930 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1931 snd_pcm_state_t state) 1932 { 1933 struct snd_pcm_runtime *runtime = substream->runtime; 1934 int f_flags = (__force int)state; 1935 1936 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1937 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1938 return -EBADFD; 1939 if (snd_pcm_running(substream)) 1940 return -EBUSY; 1941 substream->f_flags = f_flags; 1942 return 0; 1943 } 1944 1945 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, 1946 snd_pcm_state_t state) 1947 { 1948 int err; 1949 snd_pcm_sync_stop(substream, true); 1950 err = substream->ops->prepare(substream); 1951 if (err < 0) 1952 return err; 1953 return snd_pcm_do_reset(substream, state); 1954 } 1955 1956 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, 1957 snd_pcm_state_t state) 1958 { 1959 struct snd_pcm_runtime *runtime = substream->runtime; 1960 runtime->control->appl_ptr = runtime->status->hw_ptr; 1961 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1962 } 1963 1964 static const struct action_ops snd_pcm_action_prepare = { 1965 .pre_action = snd_pcm_pre_prepare, 1966 .do_action = snd_pcm_do_prepare, 1967 .post_action = snd_pcm_post_prepare 1968 }; 1969 1970 /** 1971 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1972 * @substream: the PCM substream instance 1973 * @file: file to refer f_flags 1974 * 1975 * Return: Zero if successful, or a negative error code. 1976 */ 1977 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1978 struct file *file) 1979 { 1980 int f_flags; 1981 1982 if (file) 1983 f_flags = file->f_flags; 1984 else 1985 f_flags = substream->f_flags; 1986 1987 snd_pcm_stream_lock_irq(substream); 1988 switch (substream->runtime->status->state) { 1989 case SNDRV_PCM_STATE_PAUSED: 1990 snd_pcm_pause(substream, false); 1991 fallthrough; 1992 case SNDRV_PCM_STATE_SUSPENDED: 1993 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1994 break; 1995 } 1996 snd_pcm_stream_unlock_irq(substream); 1997 1998 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1999 substream, 2000 (__force snd_pcm_state_t)f_flags); 2001 } 2002 2003 /* 2004 * drain ioctl 2005 */ 2006 2007 /* drain init callbacks: state argument ignored */ 2008 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, 2009 snd_pcm_state_t state) 2010 { 2011 struct snd_pcm_runtime *runtime = substream->runtime; 2012 switch (runtime->status->state) { 2013 case SNDRV_PCM_STATE_OPEN: 2014 case SNDRV_PCM_STATE_DISCONNECTED: 2015 case SNDRV_PCM_STATE_SUSPENDED: 2016 return -EBADFD; 2017 } 2018 runtime->trigger_master = substream; 2019 return 0; 2020 } 2021 2022 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, 2023 snd_pcm_state_t state) 2024 { 2025 struct snd_pcm_runtime *runtime = substream->runtime; 2026 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 2027 switch (runtime->status->state) { 2028 case SNDRV_PCM_STATE_PREPARED: 2029 /* start playback stream if possible */ 2030 if (! snd_pcm_playback_empty(substream)) { 2031 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 2032 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 2033 } else { 2034 runtime->status->state = SNDRV_PCM_STATE_SETUP; 2035 } 2036 break; 2037 case SNDRV_PCM_STATE_RUNNING: 2038 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 2039 break; 2040 case SNDRV_PCM_STATE_XRUN: 2041 runtime->status->state = SNDRV_PCM_STATE_SETUP; 2042 break; 2043 default: 2044 break; 2045 } 2046 } else { 2047 /* stop running stream */ 2048 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 2049 snd_pcm_state_t new_state; 2050 2051 new_state = snd_pcm_capture_avail(runtime) > 0 ? 2052 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 2053 snd_pcm_do_stop(substream, new_state); 2054 snd_pcm_post_stop(substream, new_state); 2055 } 2056 } 2057 2058 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 2059 runtime->trigger_master == substream && 2060 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) 2061 return substream->ops->trigger(substream, 2062 SNDRV_PCM_TRIGGER_DRAIN); 2063 2064 return 0; 2065 } 2066 2067 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, 2068 snd_pcm_state_t state) 2069 { 2070 } 2071 2072 static const struct action_ops snd_pcm_action_drain_init = { 2073 .pre_action = snd_pcm_pre_drain_init, 2074 .do_action = snd_pcm_do_drain_init, 2075 .post_action = snd_pcm_post_drain_init 2076 }; 2077 2078 /* 2079 * Drain the stream(s). 2080 * When the substream is linked, sync until the draining of all playback streams 2081 * is finished. 2082 * After this call, all streams are supposed to be either SETUP or DRAINING 2083 * (capture only) state. 2084 */ 2085 static int snd_pcm_drain(struct snd_pcm_substream *substream, 2086 struct file *file) 2087 { 2088 struct snd_card *card; 2089 struct snd_pcm_runtime *runtime; 2090 struct snd_pcm_substream *s; 2091 struct snd_pcm_group *group; 2092 wait_queue_entry_t wait; 2093 int result = 0; 2094 int nonblock = 0; 2095 2096 card = substream->pcm->card; 2097 runtime = substream->runtime; 2098 2099 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2100 return -EBADFD; 2101 2102 if (file) { 2103 if (file->f_flags & O_NONBLOCK) 2104 nonblock = 1; 2105 } else if (substream->f_flags & O_NONBLOCK) 2106 nonblock = 1; 2107 2108 snd_pcm_stream_lock_irq(substream); 2109 /* resume pause */ 2110 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 2111 snd_pcm_pause(substream, false); 2112 2113 /* pre-start/stop - all running streams are changed to DRAINING state */ 2114 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 2115 ACTION_ARG_IGNORE); 2116 if (result < 0) 2117 goto unlock; 2118 /* in non-blocking, we don't wait in ioctl but let caller poll */ 2119 if (nonblock) { 2120 result = -EAGAIN; 2121 goto unlock; 2122 } 2123 2124 for (;;) { 2125 long tout; 2126 struct snd_pcm_runtime *to_check; 2127 if (signal_pending(current)) { 2128 result = -ERESTARTSYS; 2129 break; 2130 } 2131 /* find a substream to drain */ 2132 to_check = NULL; 2133 group = snd_pcm_stream_group_ref(substream); 2134 snd_pcm_group_for_each_entry(s, substream) { 2135 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 2136 continue; 2137 runtime = s->runtime; 2138 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 2139 to_check = runtime; 2140 break; 2141 } 2142 } 2143 snd_pcm_group_unref(group, substream); 2144 if (!to_check) 2145 break; /* all drained */ 2146 init_waitqueue_entry(&wait, current); 2147 set_current_state(TASK_INTERRUPTIBLE); 2148 add_wait_queue(&to_check->sleep, &wait); 2149 snd_pcm_stream_unlock_irq(substream); 2150 if (runtime->no_period_wakeup) 2151 tout = MAX_SCHEDULE_TIMEOUT; 2152 else { 2153 tout = 10; 2154 if (runtime->rate) { 2155 long t = runtime->period_size * 2 / runtime->rate; 2156 tout = max(t, tout); 2157 } 2158 tout = msecs_to_jiffies(tout * 1000); 2159 } 2160 tout = schedule_timeout(tout); 2161 2162 snd_pcm_stream_lock_irq(substream); 2163 group = snd_pcm_stream_group_ref(substream); 2164 snd_pcm_group_for_each_entry(s, substream) { 2165 if (s->runtime == to_check) { 2166 remove_wait_queue(&to_check->sleep, &wait); 2167 break; 2168 } 2169 } 2170 snd_pcm_group_unref(group, substream); 2171 2172 if (card->shutdown) { 2173 result = -ENODEV; 2174 break; 2175 } 2176 if (tout == 0) { 2177 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 2178 result = -ESTRPIPE; 2179 else { 2180 dev_dbg(substream->pcm->card->dev, 2181 "playback drain error (DMA or IRQ trouble?)\n"); 2182 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2183 result = -EIO; 2184 } 2185 break; 2186 } 2187 } 2188 2189 unlock: 2190 snd_pcm_stream_unlock_irq(substream); 2191 2192 return result; 2193 } 2194 2195 /* 2196 * drop ioctl 2197 * 2198 * Immediately put all linked substreams into SETUP state. 2199 */ 2200 static int snd_pcm_drop(struct snd_pcm_substream *substream) 2201 { 2202 struct snd_pcm_runtime *runtime; 2203 int result = 0; 2204 2205 if (PCM_RUNTIME_CHECK(substream)) 2206 return -ENXIO; 2207 runtime = substream->runtime; 2208 2209 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 2210 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 2211 return -EBADFD; 2212 2213 snd_pcm_stream_lock_irq(substream); 2214 /* resume pause */ 2215 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 2216 snd_pcm_pause(substream, false); 2217 2218 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2219 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 2220 snd_pcm_stream_unlock_irq(substream); 2221 2222 return result; 2223 } 2224 2225 2226 static bool is_pcm_file(struct file *file) 2227 { 2228 struct inode *inode = file_inode(file); 2229 struct snd_pcm *pcm; 2230 unsigned int minor; 2231 2232 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 2233 return false; 2234 minor = iminor(inode); 2235 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2236 if (!pcm) 2237 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2238 if (!pcm) 2239 return false; 2240 snd_card_unref(pcm->card); 2241 return true; 2242 } 2243 2244 /* 2245 * PCM link handling 2246 */ 2247 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 2248 { 2249 int res = 0; 2250 struct snd_pcm_file *pcm_file; 2251 struct snd_pcm_substream *substream1; 2252 struct snd_pcm_group *group, *target_group; 2253 bool nonatomic = substream->pcm->nonatomic; 2254 struct fd f = fdget(fd); 2255 2256 if (!f.file) 2257 return -EBADFD; 2258 if (!is_pcm_file(f.file)) { 2259 res = -EBADFD; 2260 goto _badf; 2261 } 2262 pcm_file = f.file->private_data; 2263 substream1 = pcm_file->substream; 2264 2265 if (substream == substream1) { 2266 res = -EINVAL; 2267 goto _badf; 2268 } 2269 2270 group = kzalloc(sizeof(*group), GFP_KERNEL); 2271 if (!group) { 2272 res = -ENOMEM; 2273 goto _nolock; 2274 } 2275 snd_pcm_group_init(group); 2276 2277 down_write(&snd_pcm_link_rwsem); 2278 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 2279 substream->runtime->status->state != substream1->runtime->status->state || 2280 substream->pcm->nonatomic != substream1->pcm->nonatomic) { 2281 res = -EBADFD; 2282 goto _end; 2283 } 2284 if (snd_pcm_stream_linked(substream1)) { 2285 res = -EALREADY; 2286 goto _end; 2287 } 2288 2289 snd_pcm_stream_lock_irq(substream); 2290 if (!snd_pcm_stream_linked(substream)) { 2291 snd_pcm_group_assign(substream, group); 2292 group = NULL; /* assigned, don't free this one below */ 2293 } 2294 target_group = substream->group; 2295 snd_pcm_stream_unlock_irq(substream); 2296 2297 snd_pcm_group_lock_irq(target_group, nonatomic); 2298 snd_pcm_stream_lock_nested(substream1); 2299 snd_pcm_group_assign(substream1, target_group); 2300 refcount_inc(&target_group->refs); 2301 snd_pcm_stream_unlock(substream1); 2302 snd_pcm_group_unlock_irq(target_group, nonatomic); 2303 _end: 2304 up_write(&snd_pcm_link_rwsem); 2305 _nolock: 2306 kfree(group); 2307 _badf: 2308 fdput(f); 2309 return res; 2310 } 2311 2312 static void relink_to_local(struct snd_pcm_substream *substream) 2313 { 2314 snd_pcm_stream_lock_nested(substream); 2315 snd_pcm_group_assign(substream, &substream->self_group); 2316 snd_pcm_stream_unlock(substream); 2317 } 2318 2319 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 2320 { 2321 struct snd_pcm_group *group; 2322 bool nonatomic = substream->pcm->nonatomic; 2323 bool do_free = false; 2324 int res = 0; 2325 2326 down_write(&snd_pcm_link_rwsem); 2327 2328 if (!snd_pcm_stream_linked(substream)) { 2329 res = -EALREADY; 2330 goto _end; 2331 } 2332 2333 group = substream->group; 2334 snd_pcm_group_lock_irq(group, nonatomic); 2335 2336 relink_to_local(substream); 2337 refcount_dec(&group->refs); 2338 2339 /* detach the last stream, too */ 2340 if (list_is_singular(&group->substreams)) { 2341 relink_to_local(list_first_entry(&group->substreams, 2342 struct snd_pcm_substream, 2343 link_list)); 2344 do_free = refcount_dec_and_test(&group->refs); 2345 } 2346 2347 snd_pcm_group_unlock_irq(group, nonatomic); 2348 if (do_free) 2349 kfree(group); 2350 2351 _end: 2352 up_write(&snd_pcm_link_rwsem); 2353 return res; 2354 } 2355 2356 /* 2357 * hw configurator 2358 */ 2359 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 2360 struct snd_pcm_hw_rule *rule) 2361 { 2362 struct snd_interval t; 2363 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 2364 hw_param_interval_c(params, rule->deps[1]), &t); 2365 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2366 } 2367 2368 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 2369 struct snd_pcm_hw_rule *rule) 2370 { 2371 struct snd_interval t; 2372 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 2373 hw_param_interval_c(params, rule->deps[1]), &t); 2374 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2375 } 2376 2377 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 2378 struct snd_pcm_hw_rule *rule) 2379 { 2380 struct snd_interval t; 2381 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 2382 hw_param_interval_c(params, rule->deps[1]), 2383 (unsigned long) rule->private, &t); 2384 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2385 } 2386 2387 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 2388 struct snd_pcm_hw_rule *rule) 2389 { 2390 struct snd_interval t; 2391 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 2392 (unsigned long) rule->private, 2393 hw_param_interval_c(params, rule->deps[1]), &t); 2394 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2395 } 2396 2397 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 2398 struct snd_pcm_hw_rule *rule) 2399 { 2400 snd_pcm_format_t k; 2401 const struct snd_interval *i = 2402 hw_param_interval_c(params, rule->deps[0]); 2403 struct snd_mask m; 2404 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 2405 snd_mask_any(&m); 2406 pcm_for_each_format(k) { 2407 int bits; 2408 if (!snd_mask_test_format(mask, k)) 2409 continue; 2410 bits = snd_pcm_format_physical_width(k); 2411 if (bits <= 0) 2412 continue; /* ignore invalid formats */ 2413 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 2414 snd_mask_reset(&m, (__force unsigned)k); 2415 } 2416 return snd_mask_refine(mask, &m); 2417 } 2418 2419 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 2420 struct snd_pcm_hw_rule *rule) 2421 { 2422 struct snd_interval t; 2423 snd_pcm_format_t k; 2424 2425 t.min = UINT_MAX; 2426 t.max = 0; 2427 t.openmin = 0; 2428 t.openmax = 0; 2429 pcm_for_each_format(k) { 2430 int bits; 2431 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 2432 continue; 2433 bits = snd_pcm_format_physical_width(k); 2434 if (bits <= 0) 2435 continue; /* ignore invalid formats */ 2436 if (t.min > (unsigned)bits) 2437 t.min = bits; 2438 if (t.max < (unsigned)bits) 2439 t.max = bits; 2440 } 2441 t.integer = 1; 2442 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2443 } 2444 2445 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 2446 #error "Change this table" 2447 #endif 2448 2449 static const unsigned int rates[] = { 2450 5512, 8000, 11025, 16000, 22050, 32000, 44100, 2451 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 2452 }; 2453 2454 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 2455 .count = ARRAY_SIZE(rates), 2456 .list = rates, 2457 }; 2458 2459 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 2460 struct snd_pcm_hw_rule *rule) 2461 { 2462 struct snd_pcm_hardware *hw = rule->private; 2463 return snd_interval_list(hw_param_interval(params, rule->var), 2464 snd_pcm_known_rates.count, 2465 snd_pcm_known_rates.list, hw->rates); 2466 } 2467 2468 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 2469 struct snd_pcm_hw_rule *rule) 2470 { 2471 struct snd_interval t; 2472 struct snd_pcm_substream *substream = rule->private; 2473 t.min = 0; 2474 t.max = substream->buffer_bytes_max; 2475 t.openmin = 0; 2476 t.openmax = 0; 2477 t.integer = 1; 2478 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 2479 } 2480 2481 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 2482 { 2483 struct snd_pcm_runtime *runtime = substream->runtime; 2484 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 2485 int k, err; 2486 2487 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 2488 snd_mask_any(constrs_mask(constrs, k)); 2489 } 2490 2491 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 2492 snd_interval_any(constrs_interval(constrs, k)); 2493 } 2494 2495 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 2496 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 2497 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 2498 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 2499 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 2500 2501 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 2502 snd_pcm_hw_rule_format, NULL, 2503 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2504 if (err < 0) 2505 return err; 2506 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2507 snd_pcm_hw_rule_sample_bits, NULL, 2508 SNDRV_PCM_HW_PARAM_FORMAT, 2509 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2510 if (err < 0) 2511 return err; 2512 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 2513 snd_pcm_hw_rule_div, NULL, 2514 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2515 if (err < 0) 2516 return err; 2517 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2518 snd_pcm_hw_rule_mul, NULL, 2519 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 2520 if (err < 0) 2521 return err; 2522 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2523 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2524 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2525 if (err < 0) 2526 return err; 2527 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 2528 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2529 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 2530 if (err < 0) 2531 return err; 2532 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 2533 snd_pcm_hw_rule_div, NULL, 2534 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 2535 if (err < 0) 2536 return err; 2537 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2538 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2539 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 2540 if (err < 0) 2541 return err; 2542 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2543 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2544 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 2545 if (err < 0) 2546 return err; 2547 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 2548 snd_pcm_hw_rule_div, NULL, 2549 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 2550 if (err < 0) 2551 return err; 2552 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2553 snd_pcm_hw_rule_div, NULL, 2554 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2555 if (err < 0) 2556 return err; 2557 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2558 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2559 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2560 if (err < 0) 2561 return err; 2562 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2563 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2564 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2565 if (err < 0) 2566 return err; 2567 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2568 snd_pcm_hw_rule_mul, NULL, 2569 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 2570 if (err < 0) 2571 return err; 2572 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2573 snd_pcm_hw_rule_mulkdiv, (void*) 8, 2574 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2575 if (err < 0) 2576 return err; 2577 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 2578 snd_pcm_hw_rule_muldivk, (void*) 1000000, 2579 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 2580 if (err < 0) 2581 return err; 2582 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2583 snd_pcm_hw_rule_muldivk, (void*) 8, 2584 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2585 if (err < 0) 2586 return err; 2587 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2588 snd_pcm_hw_rule_muldivk, (void*) 8, 2589 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 2590 if (err < 0) 2591 return err; 2592 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 2593 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2594 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2595 if (err < 0) 2596 return err; 2597 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 2598 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 2599 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 2600 if (err < 0) 2601 return err; 2602 return 0; 2603 } 2604 2605 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 2606 { 2607 struct snd_pcm_runtime *runtime = substream->runtime; 2608 struct snd_pcm_hardware *hw = &runtime->hw; 2609 int err; 2610 unsigned int mask = 0; 2611 2612 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2613 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED); 2614 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2615 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); 2616 if (hw_support_mmap(substream)) { 2617 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 2618 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED); 2619 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 2620 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED); 2621 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 2622 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX); 2623 } 2624 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 2625 if (err < 0) 2626 return err; 2627 2628 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 2629 if (err < 0) 2630 return err; 2631 2632 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 2633 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD)); 2634 if (err < 0) 2635 return err; 2636 2637 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2638 hw->channels_min, hw->channels_max); 2639 if (err < 0) 2640 return err; 2641 2642 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 2643 hw->rate_min, hw->rate_max); 2644 if (err < 0) 2645 return err; 2646 2647 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2648 hw->period_bytes_min, hw->period_bytes_max); 2649 if (err < 0) 2650 return err; 2651 2652 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 2653 hw->periods_min, hw->periods_max); 2654 if (err < 0) 2655 return err; 2656 2657 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2658 hw->period_bytes_min, hw->buffer_bytes_max); 2659 if (err < 0) 2660 return err; 2661 2662 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2663 snd_pcm_hw_rule_buffer_bytes_max, substream, 2664 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2665 if (err < 0) 2666 return err; 2667 2668 /* FIXME: remove */ 2669 if (runtime->dma_bytes) { 2670 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2671 if (err < 0) 2672 return err; 2673 } 2674 2675 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2676 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2677 snd_pcm_hw_rule_rate, hw, 2678 SNDRV_PCM_HW_PARAM_RATE, -1); 2679 if (err < 0) 2680 return err; 2681 } 2682 2683 /* FIXME: this belong to lowlevel */ 2684 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2685 2686 return 0; 2687 } 2688 2689 static void pcm_release_private(struct snd_pcm_substream *substream) 2690 { 2691 if (snd_pcm_stream_linked(substream)) 2692 snd_pcm_unlink(substream); 2693 } 2694 2695 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2696 { 2697 substream->ref_count--; 2698 if (substream->ref_count > 0) 2699 return; 2700 2701 snd_pcm_drop(substream); 2702 if (substream->hw_opened) { 2703 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 2704 do_hw_free(substream); 2705 substream->ops->close(substream); 2706 substream->hw_opened = 0; 2707 } 2708 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req)) 2709 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req); 2710 if (substream->pcm_release) { 2711 substream->pcm_release(substream); 2712 substream->pcm_release = NULL; 2713 } 2714 snd_pcm_detach_substream(substream); 2715 } 2716 EXPORT_SYMBOL(snd_pcm_release_substream); 2717 2718 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2719 struct file *file, 2720 struct snd_pcm_substream **rsubstream) 2721 { 2722 struct snd_pcm_substream *substream; 2723 int err; 2724 2725 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2726 if (err < 0) 2727 return err; 2728 if (substream->ref_count > 1) { 2729 *rsubstream = substream; 2730 return 0; 2731 } 2732 2733 err = snd_pcm_hw_constraints_init(substream); 2734 if (err < 0) { 2735 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2736 goto error; 2737 } 2738 2739 err = substream->ops->open(substream); 2740 if (err < 0) 2741 goto error; 2742 2743 substream->hw_opened = 1; 2744 2745 err = snd_pcm_hw_constraints_complete(substream); 2746 if (err < 0) { 2747 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2748 goto error; 2749 } 2750 2751 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever 2752 * the DMA buffer requires it 2753 */ 2754 if (substream->managed_buffer_alloc && 2755 substream->dma_buffer.dev.need_sync) 2756 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC; 2757 2758 *rsubstream = substream; 2759 return 0; 2760 2761 error: 2762 snd_pcm_release_substream(substream); 2763 return err; 2764 } 2765 EXPORT_SYMBOL(snd_pcm_open_substream); 2766 2767 static int snd_pcm_open_file(struct file *file, 2768 struct snd_pcm *pcm, 2769 int stream) 2770 { 2771 struct snd_pcm_file *pcm_file; 2772 struct snd_pcm_substream *substream; 2773 int err; 2774 2775 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2776 if (err < 0) 2777 return err; 2778 2779 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2780 if (pcm_file == NULL) { 2781 snd_pcm_release_substream(substream); 2782 return -ENOMEM; 2783 } 2784 pcm_file->substream = substream; 2785 if (substream->ref_count == 1) 2786 substream->pcm_release = pcm_release_private; 2787 file->private_data = pcm_file; 2788 2789 return 0; 2790 } 2791 2792 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2793 { 2794 struct snd_pcm *pcm; 2795 int err = nonseekable_open(inode, file); 2796 if (err < 0) 2797 return err; 2798 pcm = snd_lookup_minor_data(iminor(inode), 2799 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2800 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2801 if (pcm) 2802 snd_card_unref(pcm->card); 2803 return err; 2804 } 2805 2806 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2807 { 2808 struct snd_pcm *pcm; 2809 int err = nonseekable_open(inode, file); 2810 if (err < 0) 2811 return err; 2812 pcm = snd_lookup_minor_data(iminor(inode), 2813 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2814 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2815 if (pcm) 2816 snd_card_unref(pcm->card); 2817 return err; 2818 } 2819 2820 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2821 { 2822 int err; 2823 wait_queue_entry_t wait; 2824 2825 if (pcm == NULL) { 2826 err = -ENODEV; 2827 goto __error1; 2828 } 2829 err = snd_card_file_add(pcm->card, file); 2830 if (err < 0) 2831 goto __error1; 2832 if (!try_module_get(pcm->card->module)) { 2833 err = -EFAULT; 2834 goto __error2; 2835 } 2836 init_waitqueue_entry(&wait, current); 2837 add_wait_queue(&pcm->open_wait, &wait); 2838 mutex_lock(&pcm->open_mutex); 2839 while (1) { 2840 err = snd_pcm_open_file(file, pcm, stream); 2841 if (err >= 0) 2842 break; 2843 if (err == -EAGAIN) { 2844 if (file->f_flags & O_NONBLOCK) { 2845 err = -EBUSY; 2846 break; 2847 } 2848 } else 2849 break; 2850 set_current_state(TASK_INTERRUPTIBLE); 2851 mutex_unlock(&pcm->open_mutex); 2852 schedule(); 2853 mutex_lock(&pcm->open_mutex); 2854 if (pcm->card->shutdown) { 2855 err = -ENODEV; 2856 break; 2857 } 2858 if (signal_pending(current)) { 2859 err = -ERESTARTSYS; 2860 break; 2861 } 2862 } 2863 remove_wait_queue(&pcm->open_wait, &wait); 2864 mutex_unlock(&pcm->open_mutex); 2865 if (err < 0) 2866 goto __error; 2867 return err; 2868 2869 __error: 2870 module_put(pcm->card->module); 2871 __error2: 2872 snd_card_file_remove(pcm->card, file); 2873 __error1: 2874 return err; 2875 } 2876 2877 static int snd_pcm_release(struct inode *inode, struct file *file) 2878 { 2879 struct snd_pcm *pcm; 2880 struct snd_pcm_substream *substream; 2881 struct snd_pcm_file *pcm_file; 2882 2883 pcm_file = file->private_data; 2884 substream = pcm_file->substream; 2885 if (snd_BUG_ON(!substream)) 2886 return -ENXIO; 2887 pcm = substream->pcm; 2888 2889 /* block until the device gets woken up as it may touch the hardware */ 2890 snd_power_wait(pcm->card); 2891 2892 mutex_lock(&pcm->open_mutex); 2893 snd_pcm_release_substream(substream); 2894 kfree(pcm_file); 2895 mutex_unlock(&pcm->open_mutex); 2896 wake_up(&pcm->open_wait); 2897 module_put(pcm->card->module); 2898 snd_card_file_remove(pcm->card, file); 2899 return 0; 2900 } 2901 2902 /* check and update PCM state; return 0 or a negative error 2903 * call this inside PCM lock 2904 */ 2905 static int do_pcm_hwsync(struct snd_pcm_substream *substream) 2906 { 2907 switch (substream->runtime->status->state) { 2908 case SNDRV_PCM_STATE_DRAINING: 2909 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2910 return -EBADFD; 2911 fallthrough; 2912 case SNDRV_PCM_STATE_RUNNING: 2913 return snd_pcm_update_hw_ptr(substream); 2914 case SNDRV_PCM_STATE_PREPARED: 2915 case SNDRV_PCM_STATE_PAUSED: 2916 return 0; 2917 case SNDRV_PCM_STATE_SUSPENDED: 2918 return -ESTRPIPE; 2919 case SNDRV_PCM_STATE_XRUN: 2920 return -EPIPE; 2921 default: 2922 return -EBADFD; 2923 } 2924 } 2925 2926 /* increase the appl_ptr; returns the processed frames or a negative error */ 2927 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, 2928 snd_pcm_uframes_t frames, 2929 snd_pcm_sframes_t avail) 2930 { 2931 struct snd_pcm_runtime *runtime = substream->runtime; 2932 snd_pcm_sframes_t appl_ptr; 2933 int ret; 2934 2935 if (avail <= 0) 2936 return 0; 2937 if (frames > (snd_pcm_uframes_t)avail) 2938 frames = avail; 2939 appl_ptr = runtime->control->appl_ptr + frames; 2940 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2941 appl_ptr -= runtime->boundary; 2942 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2943 return ret < 0 ? ret : frames; 2944 } 2945 2946 /* decrease the appl_ptr; returns the processed frames or zero for error */ 2947 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, 2948 snd_pcm_uframes_t frames, 2949 snd_pcm_sframes_t avail) 2950 { 2951 struct snd_pcm_runtime *runtime = substream->runtime; 2952 snd_pcm_sframes_t appl_ptr; 2953 int ret; 2954 2955 if (avail <= 0) 2956 return 0; 2957 if (frames > (snd_pcm_uframes_t)avail) 2958 frames = avail; 2959 appl_ptr = runtime->control->appl_ptr - frames; 2960 if (appl_ptr < 0) 2961 appl_ptr += runtime->boundary; 2962 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); 2963 /* NOTE: we return zero for errors because PulseAudio gets depressed 2964 * upon receiving an error from rewind ioctl and stops processing 2965 * any longer. Returning zero means that no rewind is done, so 2966 * it's not absolutely wrong to answer like that. 2967 */ 2968 return ret < 0 ? 0 : frames; 2969 } 2970 2971 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, 2972 snd_pcm_uframes_t frames) 2973 { 2974 snd_pcm_sframes_t ret; 2975 2976 if (frames == 0) 2977 return 0; 2978 2979 snd_pcm_stream_lock_irq(substream); 2980 ret = do_pcm_hwsync(substream); 2981 if (!ret) 2982 ret = rewind_appl_ptr(substream, frames, 2983 snd_pcm_hw_avail(substream)); 2984 snd_pcm_stream_unlock_irq(substream); 2985 if (ret >= 0) 2986 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 2987 return ret; 2988 } 2989 2990 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, 2991 snd_pcm_uframes_t frames) 2992 { 2993 snd_pcm_sframes_t ret; 2994 2995 if (frames == 0) 2996 return 0; 2997 2998 snd_pcm_stream_lock_irq(substream); 2999 ret = do_pcm_hwsync(substream); 3000 if (!ret) 3001 ret = forward_appl_ptr(substream, frames, 3002 snd_pcm_avail(substream)); 3003 snd_pcm_stream_unlock_irq(substream); 3004 if (ret >= 0) 3005 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3006 return ret; 3007 } 3008 3009 static int snd_pcm_delay(struct snd_pcm_substream *substream, 3010 snd_pcm_sframes_t *delay) 3011 { 3012 int err; 3013 3014 snd_pcm_stream_lock_irq(substream); 3015 err = do_pcm_hwsync(substream); 3016 if (delay && !err) 3017 *delay = snd_pcm_calc_delay(substream); 3018 snd_pcm_stream_unlock_irq(substream); 3019 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU); 3020 3021 return err; 3022 } 3023 3024 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream) 3025 { 3026 return snd_pcm_delay(substream, NULL); 3027 } 3028 3029 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 3030 struct snd_pcm_sync_ptr __user *_sync_ptr) 3031 { 3032 struct snd_pcm_runtime *runtime = substream->runtime; 3033 struct snd_pcm_sync_ptr sync_ptr; 3034 volatile struct snd_pcm_mmap_status *status; 3035 volatile struct snd_pcm_mmap_control *control; 3036 int err; 3037 3038 memset(&sync_ptr, 0, sizeof(sync_ptr)); 3039 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 3040 return -EFAULT; 3041 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 3042 return -EFAULT; 3043 status = runtime->status; 3044 control = runtime->control; 3045 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3046 err = snd_pcm_hwsync(substream); 3047 if (err < 0) 3048 return err; 3049 } 3050 snd_pcm_stream_lock_irq(substream); 3051 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) { 3052 err = pcm_lib_apply_appl_ptr(substream, 3053 sync_ptr.c.control.appl_ptr); 3054 if (err < 0) { 3055 snd_pcm_stream_unlock_irq(substream); 3056 return err; 3057 } 3058 } else { 3059 sync_ptr.c.control.appl_ptr = control->appl_ptr; 3060 } 3061 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3062 control->avail_min = sync_ptr.c.control.avail_min; 3063 else 3064 sync_ptr.c.control.avail_min = control->avail_min; 3065 sync_ptr.s.status.state = status->state; 3066 sync_ptr.s.status.hw_ptr = status->hw_ptr; 3067 sync_ptr.s.status.tstamp = status->tstamp; 3068 sync_ptr.s.status.suspended_state = status->suspended_state; 3069 sync_ptr.s.status.audio_tstamp = status->audio_tstamp; 3070 snd_pcm_stream_unlock_irq(substream); 3071 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 3072 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3073 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 3074 return -EFAULT; 3075 return 0; 3076 } 3077 3078 struct snd_pcm_mmap_status32 { 3079 snd_pcm_state_t state; 3080 s32 pad1; 3081 u32 hw_ptr; 3082 s32 tstamp_sec; 3083 s32 tstamp_nsec; 3084 snd_pcm_state_t suspended_state; 3085 s32 audio_tstamp_sec; 3086 s32 audio_tstamp_nsec; 3087 } __attribute__((packed)); 3088 3089 struct snd_pcm_mmap_control32 { 3090 u32 appl_ptr; 3091 u32 avail_min; 3092 }; 3093 3094 struct snd_pcm_sync_ptr32 { 3095 u32 flags; 3096 union { 3097 struct snd_pcm_mmap_status32 status; 3098 unsigned char reserved[64]; 3099 } s; 3100 union { 3101 struct snd_pcm_mmap_control32 control; 3102 unsigned char reserved[64]; 3103 } c; 3104 } __attribute__((packed)); 3105 3106 /* recalcuate the boundary within 32bit */ 3107 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime) 3108 { 3109 snd_pcm_uframes_t boundary; 3110 3111 if (! runtime->buffer_size) 3112 return 0; 3113 boundary = runtime->buffer_size; 3114 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size) 3115 boundary *= 2; 3116 return boundary; 3117 } 3118 3119 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, 3120 struct snd_pcm_sync_ptr32 __user *src) 3121 { 3122 struct snd_pcm_runtime *runtime = substream->runtime; 3123 volatile struct snd_pcm_mmap_status *status; 3124 volatile struct snd_pcm_mmap_control *control; 3125 u32 sflags; 3126 struct snd_pcm_mmap_control scontrol; 3127 struct snd_pcm_mmap_status sstatus; 3128 snd_pcm_uframes_t boundary; 3129 int err; 3130 3131 if (snd_BUG_ON(!runtime)) 3132 return -EINVAL; 3133 3134 if (get_user(sflags, &src->flags) || 3135 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3136 get_user(scontrol.avail_min, &src->c.control.avail_min)) 3137 return -EFAULT; 3138 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 3139 err = snd_pcm_hwsync(substream); 3140 if (err < 0) 3141 return err; 3142 } 3143 status = runtime->status; 3144 control = runtime->control; 3145 boundary = recalculate_boundary(runtime); 3146 if (! boundary) 3147 boundary = 0x7fffffff; 3148 snd_pcm_stream_lock_irq(substream); 3149 /* FIXME: we should consider the boundary for the sync from app */ 3150 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) { 3151 err = pcm_lib_apply_appl_ptr(substream, 3152 scontrol.appl_ptr); 3153 if (err < 0) { 3154 snd_pcm_stream_unlock_irq(substream); 3155 return err; 3156 } 3157 } else 3158 scontrol.appl_ptr = control->appl_ptr % boundary; 3159 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 3160 control->avail_min = scontrol.avail_min; 3161 else 3162 scontrol.avail_min = control->avail_min; 3163 sstatus.state = status->state; 3164 sstatus.hw_ptr = status->hw_ptr % boundary; 3165 sstatus.tstamp = status->tstamp; 3166 sstatus.suspended_state = status->suspended_state; 3167 sstatus.audio_tstamp = status->audio_tstamp; 3168 snd_pcm_stream_unlock_irq(substream); 3169 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 3170 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); 3171 if (put_user(sstatus.state, &src->s.status.state) || 3172 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || 3173 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) || 3174 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) || 3175 put_user(sstatus.suspended_state, &src->s.status.suspended_state) || 3176 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) || 3177 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) || 3178 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 3179 put_user(scontrol.avail_min, &src->c.control.avail_min)) 3180 return -EFAULT; 3181 3182 return 0; 3183 } 3184 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32) 3185 3186 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 3187 { 3188 struct snd_pcm_runtime *runtime = substream->runtime; 3189 int arg; 3190 3191 if (get_user(arg, _arg)) 3192 return -EFAULT; 3193 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 3194 return -EINVAL; 3195 runtime->tstamp_type = arg; 3196 return 0; 3197 } 3198 3199 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream, 3200 struct snd_xferi __user *_xferi) 3201 { 3202 struct snd_xferi xferi; 3203 struct snd_pcm_runtime *runtime = substream->runtime; 3204 snd_pcm_sframes_t result; 3205 3206 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3207 return -EBADFD; 3208 if (put_user(0, &_xferi->result)) 3209 return -EFAULT; 3210 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 3211 return -EFAULT; 3212 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3213 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 3214 else 3215 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 3216 if (put_user(result, &_xferi->result)) 3217 return -EFAULT; 3218 return result < 0 ? result : 0; 3219 } 3220 3221 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, 3222 struct snd_xfern __user *_xfern) 3223 { 3224 struct snd_xfern xfern; 3225 struct snd_pcm_runtime *runtime = substream->runtime; 3226 void *bufs; 3227 snd_pcm_sframes_t result; 3228 3229 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3230 return -EBADFD; 3231 if (runtime->channels > 128) 3232 return -EINVAL; 3233 if (put_user(0, &_xfern->result)) 3234 return -EFAULT; 3235 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 3236 return -EFAULT; 3237 3238 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); 3239 if (IS_ERR(bufs)) 3240 return PTR_ERR(bufs); 3241 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3242 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 3243 else 3244 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 3245 kfree(bufs); 3246 if (put_user(result, &_xfern->result)) 3247 return -EFAULT; 3248 return result < 0 ? result : 0; 3249 } 3250 3251 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, 3252 snd_pcm_uframes_t __user *_frames) 3253 { 3254 snd_pcm_uframes_t frames; 3255 snd_pcm_sframes_t result; 3256 3257 if (get_user(frames, _frames)) 3258 return -EFAULT; 3259 if (put_user(0, _frames)) 3260 return -EFAULT; 3261 result = snd_pcm_rewind(substream, frames); 3262 if (put_user(result, _frames)) 3263 return -EFAULT; 3264 return result < 0 ? result : 0; 3265 } 3266 3267 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, 3268 snd_pcm_uframes_t __user *_frames) 3269 { 3270 snd_pcm_uframes_t frames; 3271 snd_pcm_sframes_t result; 3272 3273 if (get_user(frames, _frames)) 3274 return -EFAULT; 3275 if (put_user(0, _frames)) 3276 return -EFAULT; 3277 result = snd_pcm_forward(substream, frames); 3278 if (put_user(result, _frames)) 3279 return -EFAULT; 3280 return result < 0 ? result : 0; 3281 } 3282 3283 static int snd_pcm_common_ioctl(struct file *file, 3284 struct snd_pcm_substream *substream, 3285 unsigned int cmd, void __user *arg) 3286 { 3287 struct snd_pcm_file *pcm_file = file->private_data; 3288 int res; 3289 3290 if (PCM_RUNTIME_CHECK(substream)) 3291 return -ENXIO; 3292 3293 if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3294 return -EBADFD; 3295 3296 res = snd_power_wait(substream->pcm->card); 3297 if (res < 0) 3298 return res; 3299 3300 switch (cmd) { 3301 case SNDRV_PCM_IOCTL_PVERSION: 3302 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 3303 case SNDRV_PCM_IOCTL_INFO: 3304 return snd_pcm_info_user(substream, arg); 3305 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 3306 return 0; 3307 case SNDRV_PCM_IOCTL_TTSTAMP: 3308 return snd_pcm_tstamp(substream, arg); 3309 case SNDRV_PCM_IOCTL_USER_PVERSION: 3310 if (get_user(pcm_file->user_pversion, 3311 (unsigned int __user *)arg)) 3312 return -EFAULT; 3313 return 0; 3314 case SNDRV_PCM_IOCTL_HW_REFINE: 3315 return snd_pcm_hw_refine_user(substream, arg); 3316 case SNDRV_PCM_IOCTL_HW_PARAMS: 3317 return snd_pcm_hw_params_user(substream, arg); 3318 case SNDRV_PCM_IOCTL_HW_FREE: 3319 return snd_pcm_hw_free(substream); 3320 case SNDRV_PCM_IOCTL_SW_PARAMS: 3321 return snd_pcm_sw_params_user(substream, arg); 3322 case SNDRV_PCM_IOCTL_STATUS32: 3323 return snd_pcm_status_user32(substream, arg, false); 3324 case SNDRV_PCM_IOCTL_STATUS_EXT32: 3325 return snd_pcm_status_user32(substream, arg, true); 3326 case SNDRV_PCM_IOCTL_STATUS64: 3327 return snd_pcm_status_user64(substream, arg, false); 3328 case SNDRV_PCM_IOCTL_STATUS_EXT64: 3329 return snd_pcm_status_user64(substream, arg, true); 3330 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 3331 return snd_pcm_channel_info_user(substream, arg); 3332 case SNDRV_PCM_IOCTL_PREPARE: 3333 return snd_pcm_prepare(substream, file); 3334 case SNDRV_PCM_IOCTL_RESET: 3335 return snd_pcm_reset(substream); 3336 case SNDRV_PCM_IOCTL_START: 3337 return snd_pcm_start_lock_irq(substream); 3338 case SNDRV_PCM_IOCTL_LINK: 3339 return snd_pcm_link(substream, (int)(unsigned long) arg); 3340 case SNDRV_PCM_IOCTL_UNLINK: 3341 return snd_pcm_unlink(substream); 3342 case SNDRV_PCM_IOCTL_RESUME: 3343 return snd_pcm_resume(substream); 3344 case SNDRV_PCM_IOCTL_XRUN: 3345 return snd_pcm_xrun(substream); 3346 case SNDRV_PCM_IOCTL_HWSYNC: 3347 return snd_pcm_hwsync(substream); 3348 case SNDRV_PCM_IOCTL_DELAY: 3349 { 3350 snd_pcm_sframes_t delay = 0; 3351 snd_pcm_sframes_t __user *res = arg; 3352 int err; 3353 3354 err = snd_pcm_delay(substream, &delay); 3355 if (err) 3356 return err; 3357 if (put_user(delay, res)) 3358 return -EFAULT; 3359 return 0; 3360 } 3361 case __SNDRV_PCM_IOCTL_SYNC_PTR32: 3362 return snd_pcm_ioctl_sync_ptr_compat(substream, arg); 3363 case __SNDRV_PCM_IOCTL_SYNC_PTR64: 3364 return snd_pcm_sync_ptr(substream, arg); 3365 #ifdef CONFIG_SND_SUPPORT_OLD_API 3366 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 3367 return snd_pcm_hw_refine_old_user(substream, arg); 3368 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 3369 return snd_pcm_hw_params_old_user(substream, arg); 3370 #endif 3371 case SNDRV_PCM_IOCTL_DRAIN: 3372 return snd_pcm_drain(substream, file); 3373 case SNDRV_PCM_IOCTL_DROP: 3374 return snd_pcm_drop(substream); 3375 case SNDRV_PCM_IOCTL_PAUSE: 3376 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg); 3377 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 3378 case SNDRV_PCM_IOCTL_READI_FRAMES: 3379 return snd_pcm_xferi_frames_ioctl(substream, arg); 3380 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 3381 case SNDRV_PCM_IOCTL_READN_FRAMES: 3382 return snd_pcm_xfern_frames_ioctl(substream, arg); 3383 case SNDRV_PCM_IOCTL_REWIND: 3384 return snd_pcm_rewind_ioctl(substream, arg); 3385 case SNDRV_PCM_IOCTL_FORWARD: 3386 return snd_pcm_forward_ioctl(substream, arg); 3387 } 3388 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 3389 return -ENOTTY; 3390 } 3391 3392 static long snd_pcm_ioctl(struct file *file, unsigned int cmd, 3393 unsigned long arg) 3394 { 3395 struct snd_pcm_file *pcm_file; 3396 3397 pcm_file = file->private_data; 3398 3399 if (((cmd >> 8) & 0xff) != 'A') 3400 return -ENOTTY; 3401 3402 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd, 3403 (void __user *)arg); 3404 } 3405 3406 /** 3407 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space 3408 * @substream: PCM substream 3409 * @cmd: IOCTL cmd 3410 * @arg: IOCTL argument 3411 * 3412 * The function is provided primarily for OSS layer and USB gadget drivers, 3413 * and it allows only the limited set of ioctls (hw_params, sw_params, 3414 * prepare, start, drain, drop, forward). 3415 */ 3416 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 3417 unsigned int cmd, void *arg) 3418 { 3419 snd_pcm_uframes_t *frames = arg; 3420 snd_pcm_sframes_t result; 3421 3422 if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3423 return -EBADFD; 3424 3425 switch (cmd) { 3426 case SNDRV_PCM_IOCTL_FORWARD: 3427 { 3428 /* provided only for OSS; capture-only and no value returned */ 3429 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 3430 return -EINVAL; 3431 result = snd_pcm_forward(substream, *frames); 3432 return result < 0 ? result : 0; 3433 } 3434 case SNDRV_PCM_IOCTL_HW_PARAMS: 3435 return snd_pcm_hw_params(substream, arg); 3436 case SNDRV_PCM_IOCTL_SW_PARAMS: 3437 return snd_pcm_sw_params(substream, arg); 3438 case SNDRV_PCM_IOCTL_PREPARE: 3439 return snd_pcm_prepare(substream, NULL); 3440 case SNDRV_PCM_IOCTL_START: 3441 return snd_pcm_start_lock_irq(substream); 3442 case SNDRV_PCM_IOCTL_DRAIN: 3443 return snd_pcm_drain(substream, NULL); 3444 case SNDRV_PCM_IOCTL_DROP: 3445 return snd_pcm_drop(substream); 3446 case SNDRV_PCM_IOCTL_DELAY: 3447 return snd_pcm_delay(substream, frames); 3448 default: 3449 return -EINVAL; 3450 } 3451 } 3452 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 3453 3454 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 3455 loff_t * offset) 3456 { 3457 struct snd_pcm_file *pcm_file; 3458 struct snd_pcm_substream *substream; 3459 struct snd_pcm_runtime *runtime; 3460 snd_pcm_sframes_t result; 3461 3462 pcm_file = file->private_data; 3463 substream = pcm_file->substream; 3464 if (PCM_RUNTIME_CHECK(substream)) 3465 return -ENXIO; 3466 runtime = substream->runtime; 3467 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 3468 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3469 return -EBADFD; 3470 if (!frame_aligned(runtime, count)) 3471 return -EINVAL; 3472 count = bytes_to_frames(runtime, count); 3473 result = snd_pcm_lib_read(substream, buf, count); 3474 if (result > 0) 3475 result = frames_to_bytes(runtime, result); 3476 return result; 3477 } 3478 3479 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 3480 size_t count, loff_t * offset) 3481 { 3482 struct snd_pcm_file *pcm_file; 3483 struct snd_pcm_substream *substream; 3484 struct snd_pcm_runtime *runtime; 3485 snd_pcm_sframes_t result; 3486 3487 pcm_file = file->private_data; 3488 substream = pcm_file->substream; 3489 if (PCM_RUNTIME_CHECK(substream)) 3490 return -ENXIO; 3491 runtime = substream->runtime; 3492 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 3493 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3494 return -EBADFD; 3495 if (!frame_aligned(runtime, count)) 3496 return -EINVAL; 3497 count = bytes_to_frames(runtime, count); 3498 result = snd_pcm_lib_write(substream, buf, count); 3499 if (result > 0) 3500 result = frames_to_bytes(runtime, result); 3501 return result; 3502 } 3503 3504 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) 3505 { 3506 struct snd_pcm_file *pcm_file; 3507 struct snd_pcm_substream *substream; 3508 struct snd_pcm_runtime *runtime; 3509 snd_pcm_sframes_t result; 3510 unsigned long i; 3511 void __user **bufs; 3512 snd_pcm_uframes_t frames; 3513 3514 pcm_file = iocb->ki_filp->private_data; 3515 substream = pcm_file->substream; 3516 if (PCM_RUNTIME_CHECK(substream)) 3517 return -ENXIO; 3518 runtime = substream->runtime; 3519 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 3520 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3521 return -EBADFD; 3522 if (!iter_is_iovec(to)) 3523 return -EINVAL; 3524 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) 3525 return -EINVAL; 3526 if (!frame_aligned(runtime, to->iov->iov_len)) 3527 return -EINVAL; 3528 frames = bytes_to_samples(runtime, to->iov->iov_len); 3529 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL); 3530 if (bufs == NULL) 3531 return -ENOMEM; 3532 for (i = 0; i < to->nr_segs; ++i) 3533 bufs[i] = to->iov[i].iov_base; 3534 result = snd_pcm_lib_readv(substream, bufs, frames); 3535 if (result > 0) 3536 result = frames_to_bytes(runtime, result); 3537 kfree(bufs); 3538 return result; 3539 } 3540 3541 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) 3542 { 3543 struct snd_pcm_file *pcm_file; 3544 struct snd_pcm_substream *substream; 3545 struct snd_pcm_runtime *runtime; 3546 snd_pcm_sframes_t result; 3547 unsigned long i; 3548 void __user **bufs; 3549 snd_pcm_uframes_t frames; 3550 3551 pcm_file = iocb->ki_filp->private_data; 3552 substream = pcm_file->substream; 3553 if (PCM_RUNTIME_CHECK(substream)) 3554 return -ENXIO; 3555 runtime = substream->runtime; 3556 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 3557 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3558 return -EBADFD; 3559 if (!iter_is_iovec(from)) 3560 return -EINVAL; 3561 if (from->nr_segs > 128 || from->nr_segs != runtime->channels || 3562 !frame_aligned(runtime, from->iov->iov_len)) 3563 return -EINVAL; 3564 frames = bytes_to_samples(runtime, from->iov->iov_len); 3565 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL); 3566 if (bufs == NULL) 3567 return -ENOMEM; 3568 for (i = 0; i < from->nr_segs; ++i) 3569 bufs[i] = from->iov[i].iov_base; 3570 result = snd_pcm_lib_writev(substream, bufs, frames); 3571 if (result > 0) 3572 result = frames_to_bytes(runtime, result); 3573 kfree(bufs); 3574 return result; 3575 } 3576 3577 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait) 3578 { 3579 struct snd_pcm_file *pcm_file; 3580 struct snd_pcm_substream *substream; 3581 struct snd_pcm_runtime *runtime; 3582 __poll_t mask, ok; 3583 snd_pcm_uframes_t avail; 3584 3585 pcm_file = file->private_data; 3586 3587 substream = pcm_file->substream; 3588 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 3589 ok = EPOLLOUT | EPOLLWRNORM; 3590 else 3591 ok = EPOLLIN | EPOLLRDNORM; 3592 if (PCM_RUNTIME_CHECK(substream)) 3593 return ok | EPOLLERR; 3594 3595 runtime = substream->runtime; 3596 if (runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3597 return ok | EPOLLERR; 3598 3599 poll_wait(file, &runtime->sleep, wait); 3600 3601 mask = 0; 3602 snd_pcm_stream_lock_irq(substream); 3603 avail = snd_pcm_avail(substream); 3604 switch (runtime->status->state) { 3605 case SNDRV_PCM_STATE_RUNNING: 3606 case SNDRV_PCM_STATE_PREPARED: 3607 case SNDRV_PCM_STATE_PAUSED: 3608 if (avail >= runtime->control->avail_min) 3609 mask = ok; 3610 break; 3611 case SNDRV_PCM_STATE_DRAINING: 3612 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 3613 mask = ok; 3614 if (!avail) 3615 mask |= EPOLLERR; 3616 } 3617 break; 3618 default: 3619 mask = ok | EPOLLERR; 3620 break; 3621 } 3622 snd_pcm_stream_unlock_irq(substream); 3623 return mask; 3624 } 3625 3626 /* 3627 * mmap support 3628 */ 3629 3630 /* 3631 * Only on coherent architectures, we can mmap the status and the control records 3632 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3633 */ 3634 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3635 /* 3636 * mmap status record 3637 */ 3638 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) 3639 { 3640 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3641 struct snd_pcm_runtime *runtime; 3642 3643 if (substream == NULL) 3644 return VM_FAULT_SIGBUS; 3645 runtime = substream->runtime; 3646 vmf->page = virt_to_page(runtime->status); 3647 get_page(vmf->page); 3648 return 0; 3649 } 3650 3651 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3652 { 3653 .fault = snd_pcm_mmap_status_fault, 3654 }; 3655 3656 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3657 struct vm_area_struct *area) 3658 { 3659 long size; 3660 if (!(area->vm_flags & VM_READ)) 3661 return -EINVAL; 3662 size = area->vm_end - area->vm_start; 3663 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3664 return -EINVAL; 3665 area->vm_ops = &snd_pcm_vm_ops_status; 3666 area->vm_private_data = substream; 3667 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3668 return 0; 3669 } 3670 3671 /* 3672 * mmap control record 3673 */ 3674 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) 3675 { 3676 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3677 struct snd_pcm_runtime *runtime; 3678 3679 if (substream == NULL) 3680 return VM_FAULT_SIGBUS; 3681 runtime = substream->runtime; 3682 vmf->page = virt_to_page(runtime->control); 3683 get_page(vmf->page); 3684 return 0; 3685 } 3686 3687 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3688 { 3689 .fault = snd_pcm_mmap_control_fault, 3690 }; 3691 3692 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3693 struct vm_area_struct *area) 3694 { 3695 long size; 3696 if (!(area->vm_flags & VM_READ)) 3697 return -EINVAL; 3698 size = area->vm_end - area->vm_start; 3699 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3700 return -EINVAL; 3701 area->vm_ops = &snd_pcm_vm_ops_control; 3702 area->vm_private_data = substream; 3703 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3704 return 0; 3705 } 3706 3707 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) 3708 { 3709 /* If drivers require the explicit sync (typically for non-coherent 3710 * pages), we have to disable the mmap of status and control data 3711 * to enforce the control via SYNC_PTR ioctl. 3712 */ 3713 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC) 3714 return false; 3715 /* See pcm_control_mmap_allowed() below. 3716 * Since older alsa-lib requires both status and control mmaps to be 3717 * coupled, we have to disable the status mmap for old alsa-lib, too. 3718 */ 3719 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && 3720 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) 3721 return false; 3722 return true; 3723 } 3724 3725 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) 3726 { 3727 if (pcm_file->no_compat_mmap) 3728 return false; 3729 /* see above */ 3730 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC) 3731 return false; 3732 /* Disallow the control mmap when SYNC_APPLPTR flag is set; 3733 * it enforces the user-space to fall back to snd_pcm_sync_ptr(), 3734 * thus it effectively assures the manual update of appl_ptr. 3735 */ 3736 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) 3737 return false; 3738 return true; 3739 } 3740 3741 #else /* ! coherent mmap */ 3742 /* 3743 * don't support mmap for status and control records. 3744 */ 3745 #define pcm_status_mmap_allowed(pcm_file) false 3746 #define pcm_control_mmap_allowed(pcm_file) false 3747 3748 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3749 struct vm_area_struct *area) 3750 { 3751 return -ENXIO; 3752 } 3753 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3754 struct vm_area_struct *area) 3755 { 3756 return -ENXIO; 3757 } 3758 #endif /* coherent mmap */ 3759 3760 /* 3761 * fault callback for mmapping a RAM page 3762 */ 3763 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) 3764 { 3765 struct snd_pcm_substream *substream = vmf->vma->vm_private_data; 3766 struct snd_pcm_runtime *runtime; 3767 unsigned long offset; 3768 struct page * page; 3769 size_t dma_bytes; 3770 3771 if (substream == NULL) 3772 return VM_FAULT_SIGBUS; 3773 runtime = substream->runtime; 3774 offset = vmf->pgoff << PAGE_SHIFT; 3775 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3776 if (offset > dma_bytes - PAGE_SIZE) 3777 return VM_FAULT_SIGBUS; 3778 if (substream->ops->page) 3779 page = substream->ops->page(substream, offset); 3780 else if (!snd_pcm_get_dma_buf(substream)) 3781 page = virt_to_page(runtime->dma_area + offset); 3782 else 3783 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset); 3784 if (!page) 3785 return VM_FAULT_SIGBUS; 3786 get_page(page); 3787 vmf->page = page; 3788 return 0; 3789 } 3790 3791 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3792 .open = snd_pcm_mmap_data_open, 3793 .close = snd_pcm_mmap_data_close, 3794 }; 3795 3796 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3797 .open = snd_pcm_mmap_data_open, 3798 .close = snd_pcm_mmap_data_close, 3799 .fault = snd_pcm_mmap_data_fault, 3800 }; 3801 3802 /* 3803 * mmap the DMA buffer on RAM 3804 */ 3805 3806 /** 3807 * snd_pcm_lib_default_mmap - Default PCM data mmap function 3808 * @substream: PCM substream 3809 * @area: VMA 3810 * 3811 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, 3812 * this function is invoked implicitly. 3813 */ 3814 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3815 struct vm_area_struct *area) 3816 { 3817 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3818 if (!substream->ops->page && 3819 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area)) 3820 return 0; 3821 /* mmap with fault handler */ 3822 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3823 return 0; 3824 } 3825 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3826 3827 /* 3828 * mmap the DMA buffer on I/O memory area 3829 */ 3830 #if SNDRV_PCM_INFO_MMAP_IOMEM 3831 /** 3832 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem 3833 * @substream: PCM substream 3834 * @area: VMA 3835 * 3836 * When your hardware uses the iomapped pages as the hardware buffer and 3837 * wants to mmap it, pass this function as mmap pcm_ops. Note that this 3838 * is supposed to work only on limited architectures. 3839 */ 3840 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3841 struct vm_area_struct *area) 3842 { 3843 struct snd_pcm_runtime *runtime = substream->runtime; 3844 3845 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3846 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3847 } 3848 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3849 #endif /* SNDRV_PCM_INFO_MMAP */ 3850 3851 /* 3852 * mmap DMA buffer 3853 */ 3854 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3855 struct vm_area_struct *area) 3856 { 3857 struct snd_pcm_runtime *runtime; 3858 long size; 3859 unsigned long offset; 3860 size_t dma_bytes; 3861 int err; 3862 3863 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3864 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3865 return -EINVAL; 3866 } else { 3867 if (!(area->vm_flags & VM_READ)) 3868 return -EINVAL; 3869 } 3870 runtime = substream->runtime; 3871 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3872 return -EBADFD; 3873 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3874 return -ENXIO; 3875 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3876 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3877 return -EINVAL; 3878 size = area->vm_end - area->vm_start; 3879 offset = area->vm_pgoff << PAGE_SHIFT; 3880 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3881 if ((size_t)size > dma_bytes) 3882 return -EINVAL; 3883 if (offset > dma_bytes - size) 3884 return -EINVAL; 3885 3886 area->vm_ops = &snd_pcm_vm_ops_data; 3887 area->vm_private_data = substream; 3888 if (substream->ops->mmap) 3889 err = substream->ops->mmap(substream, area); 3890 else 3891 err = snd_pcm_lib_default_mmap(substream, area); 3892 if (!err) 3893 atomic_inc(&substream->mmap_count); 3894 return err; 3895 } 3896 EXPORT_SYMBOL(snd_pcm_mmap_data); 3897 3898 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3899 { 3900 struct snd_pcm_file * pcm_file; 3901 struct snd_pcm_substream *substream; 3902 unsigned long offset; 3903 3904 pcm_file = file->private_data; 3905 substream = pcm_file->substream; 3906 if (PCM_RUNTIME_CHECK(substream)) 3907 return -ENXIO; 3908 if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3909 return -EBADFD; 3910 3911 offset = area->vm_pgoff << PAGE_SHIFT; 3912 switch (offset) { 3913 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD: 3914 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3915 return -ENXIO; 3916 fallthrough; 3917 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 3918 if (!pcm_status_mmap_allowed(pcm_file)) 3919 return -ENXIO; 3920 return snd_pcm_mmap_status(substream, file, area); 3921 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD: 3922 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) 3923 return -ENXIO; 3924 fallthrough; 3925 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 3926 if (!pcm_control_mmap_allowed(pcm_file)) 3927 return -ENXIO; 3928 return snd_pcm_mmap_control(substream, file, area); 3929 default: 3930 return snd_pcm_mmap_data(substream, file, area); 3931 } 3932 return 0; 3933 } 3934 3935 static int snd_pcm_fasync(int fd, struct file * file, int on) 3936 { 3937 struct snd_pcm_file * pcm_file; 3938 struct snd_pcm_substream *substream; 3939 struct snd_pcm_runtime *runtime; 3940 3941 pcm_file = file->private_data; 3942 substream = pcm_file->substream; 3943 if (PCM_RUNTIME_CHECK(substream)) 3944 return -ENXIO; 3945 runtime = substream->runtime; 3946 if (runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 3947 return -EBADFD; 3948 return fasync_helper(fd, file, on, &runtime->fasync); 3949 } 3950 3951 /* 3952 * ioctl32 compat 3953 */ 3954 #ifdef CONFIG_COMPAT 3955 #include "pcm_compat.c" 3956 #else 3957 #define snd_pcm_ioctl_compat NULL 3958 #endif 3959 3960 /* 3961 * To be removed helpers to keep binary compatibility 3962 */ 3963 3964 #ifdef CONFIG_SND_SUPPORT_OLD_API 3965 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3966 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3967 3968 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3969 struct snd_pcm_hw_params_old *oparams) 3970 { 3971 unsigned int i; 3972 3973 memset(params, 0, sizeof(*params)); 3974 params->flags = oparams->flags; 3975 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3976 params->masks[i].bits[0] = oparams->masks[i]; 3977 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3978 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3979 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3980 params->info = oparams->info; 3981 params->msbits = oparams->msbits; 3982 params->rate_num = oparams->rate_num; 3983 params->rate_den = oparams->rate_den; 3984 params->fifo_size = oparams->fifo_size; 3985 } 3986 3987 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3988 struct snd_pcm_hw_params *params) 3989 { 3990 unsigned int i; 3991 3992 memset(oparams, 0, sizeof(*oparams)); 3993 oparams->flags = params->flags; 3994 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3995 oparams->masks[i] = params->masks[i].bits[0]; 3996 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3997 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3998 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3999 oparams->info = params->info; 4000 oparams->msbits = params->msbits; 4001 oparams->rate_num = params->rate_num; 4002 oparams->rate_den = params->rate_den; 4003 oparams->fifo_size = params->fifo_size; 4004 } 4005 4006 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 4007 struct snd_pcm_hw_params_old __user * _oparams) 4008 { 4009 struct snd_pcm_hw_params *params; 4010 struct snd_pcm_hw_params_old *oparams = NULL; 4011 int err; 4012 4013 params = kmalloc(sizeof(*params), GFP_KERNEL); 4014 if (!params) 4015 return -ENOMEM; 4016 4017 oparams = memdup_user(_oparams, sizeof(*oparams)); 4018 if (IS_ERR(oparams)) { 4019 err = PTR_ERR(oparams); 4020 goto out; 4021 } 4022 snd_pcm_hw_convert_from_old_params(params, oparams); 4023 err = snd_pcm_hw_refine(substream, params); 4024 if (err < 0) 4025 goto out_old; 4026 4027 err = fixup_unreferenced_params(substream, params); 4028 if (err < 0) 4029 goto out_old; 4030 4031 snd_pcm_hw_convert_to_old_params(oparams, params); 4032 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 4033 err = -EFAULT; 4034 out_old: 4035 kfree(oparams); 4036 out: 4037 kfree(params); 4038 return err; 4039 } 4040 4041 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 4042 struct snd_pcm_hw_params_old __user * _oparams) 4043 { 4044 struct snd_pcm_hw_params *params; 4045 struct snd_pcm_hw_params_old *oparams = NULL; 4046 int err; 4047 4048 params = kmalloc(sizeof(*params), GFP_KERNEL); 4049 if (!params) 4050 return -ENOMEM; 4051 4052 oparams = memdup_user(_oparams, sizeof(*oparams)); 4053 if (IS_ERR(oparams)) { 4054 err = PTR_ERR(oparams); 4055 goto out; 4056 } 4057 4058 snd_pcm_hw_convert_from_old_params(params, oparams); 4059 err = snd_pcm_hw_params(substream, params); 4060 if (err < 0) 4061 goto out_old; 4062 4063 snd_pcm_hw_convert_to_old_params(oparams, params); 4064 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) 4065 err = -EFAULT; 4066 out_old: 4067 kfree(oparams); 4068 out: 4069 kfree(params); 4070 return err; 4071 } 4072 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 4073 4074 #ifndef CONFIG_MMU 4075 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 4076 unsigned long addr, 4077 unsigned long len, 4078 unsigned long pgoff, 4079 unsigned long flags) 4080 { 4081 struct snd_pcm_file *pcm_file = file->private_data; 4082 struct snd_pcm_substream *substream = pcm_file->substream; 4083 struct snd_pcm_runtime *runtime = substream->runtime; 4084 unsigned long offset = pgoff << PAGE_SHIFT; 4085 4086 switch (offset) { 4087 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: 4088 return (unsigned long)runtime->status; 4089 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: 4090 return (unsigned long)runtime->control; 4091 default: 4092 return (unsigned long)runtime->dma_area + offset; 4093 } 4094 } 4095 #else 4096 # define snd_pcm_get_unmapped_area NULL 4097 #endif 4098 4099 /* 4100 * Register section 4101 */ 4102 4103 const struct file_operations snd_pcm_f_ops[2] = { 4104 { 4105 .owner = THIS_MODULE, 4106 .write = snd_pcm_write, 4107 .write_iter = snd_pcm_writev, 4108 .open = snd_pcm_playback_open, 4109 .release = snd_pcm_release, 4110 .llseek = no_llseek, 4111 .poll = snd_pcm_poll, 4112 .unlocked_ioctl = snd_pcm_ioctl, 4113 .compat_ioctl = snd_pcm_ioctl_compat, 4114 .mmap = snd_pcm_mmap, 4115 .fasync = snd_pcm_fasync, 4116 .get_unmapped_area = snd_pcm_get_unmapped_area, 4117 }, 4118 { 4119 .owner = THIS_MODULE, 4120 .read = snd_pcm_read, 4121 .read_iter = snd_pcm_readv, 4122 .open = snd_pcm_capture_open, 4123 .release = snd_pcm_release, 4124 .llseek = no_llseek, 4125 .poll = snd_pcm_poll, 4126 .unlocked_ioctl = snd_pcm_ioctl, 4127 .compat_ioctl = snd_pcm_ioctl_compat, 4128 .mmap = snd_pcm_mmap, 4129 .fasync = snd_pcm_fasync, 4130 .get_unmapped_area = snd_pcm_get_unmapped_area, 4131 } 4132 }; 4133