sound/core/pcm_native.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Digital Audio (PCM) abstract layer
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6
   7 #include <linux/compat.h>
   8 #include <linux/mm.h>
   9 #include <linux/module.h>
  10 #include <linux/file.h>
  11 #include <linux/slab.h>
  12 #include <linux/sched/signal.h>
  13 #include <linux/time.h>
  14 #include <linux/pm_qos.h>
  15 #include <linux/io.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/vmalloc.h>
  18 #include <sound/core.h>
  19 #include <sound/control.h>
  20 #include <sound/info.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/timer.h>
  24 #include <sound/minors.h>
  25 #include <linux/uio.h>
  26 #include <linux/delay.h>
  27
  28 #include "pcm_local.h"
  29
  30 #ifdef CONFIG_SND_DEBUG
  31 #define CREATE_TRACE_POINTS
  32 #include "pcm_param_trace.h"
  33 #else
  34 #define trace_hw_mask_param_enabled()           0
  35 #define trace_hw_interval_param_enabled()       0
  36 #define trace_hw_mask_param(substream, type, index, prev, curr)
  37 #define trace_hw_interval_param(substream, type, index, prev, curr)
  38 #endif
  39
  40 /*
  41  *  Compatibility
  42  */
  43
  44 struct snd_pcm_hw_params_old {
  45         unsigned int flags;
  46         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  47                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  48         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  49                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  50         unsigned int rmask;
  51         unsigned int cmask;
  52         unsigned int info;
  53         unsigned int msbits;
  54         unsigned int rate_num;
  55         unsigned int rate_den;
  56         snd_pcm_uframes_t fifo_size;
  57         unsigned char reserved[64];
  58 };
  59
  60 #ifdef CONFIG_SND_SUPPORT_OLD_API
  61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  63
  64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 #endif
  69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  70
  71 /*
  72  *
  73  */
  74
  75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  76
  77 void snd_pcm_group_init(struct snd_pcm_group *group)
  78 {
  79         spin_lock_init(&group->lock);
  80         mutex_init(&group->mutex);
  81         INIT_LIST_HEAD(&group->substreams);
  82         refcount_set(&group->refs, 1);
  83 }
  84
  85 /* define group lock helpers */
  86 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
  87 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
  88 { \
  89         if (nonatomic) \
  90                 mutex_ ## mutex_action(&group->mutex); \
  91         else \
  92                 spin_ ## action(&group->lock); \
  93 }
  94
  95 DEFINE_PCM_GROUP_LOCK(lock, lock);
  96 DEFINE_PCM_GROUP_LOCK(unlock, unlock);
  97 DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
  98 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
  99
 100 /**
 101  * snd_pcm_stream_lock - Lock the PCM stream
 102  * @substream: PCM substream
 103  *
 104  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 105  * flag of the given substream.  This also takes the global link rw lock
 106  * (or rw sem), too, for avoiding the race with linked streams.
 107  */
 108 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 109 {
 110         snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
 111 }
 112 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
 113
 114 /**
 115  * snd_pcm_stream_unlock - Unlock the PCM stream
 116  * @substream: PCM substream
 117  *
 118  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
 119  */
 120 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 121 {
 122         snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
 123 }
 124 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
 125
 126 /**
 127  * snd_pcm_stream_lock_irq - Lock the PCM stream
 128  * @substream: PCM substream
 129  *
 130  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
 131  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 132  * as snd_pcm_stream_lock().
 133  */
 134 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 135 {
 136         snd_pcm_group_lock_irq(&substream->self_group,
 137                                substream->pcm->nonatomic);
 138 }
 139 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
 140
 141 static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
 142 {
 143         struct snd_pcm_group *group = &substream->self_group;
 144
 145         if (substream->pcm->nonatomic)
 146                 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
 147         else
 148                 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
 149 }
 150
 151 /**
 152  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 153  * @substream: PCM substream
 154  *
 155  * This is a counter-part of snd_pcm_stream_lock_irq().
 156  */
 157 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 158 {
 159         snd_pcm_group_unlock_irq(&substream->self_group,
 160                                  substream->pcm->nonatomic);
 161 }
 162 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
 163
 164 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
 165 {
 166         unsigned long flags = 0;
 167         if (substream->pcm->nonatomic)
 168                 mutex_lock(&substream->self_group.mutex);
 169         else
 170                 spin_lock_irqsave(&substream->self_group.lock, flags);
 171         return flags;
 172 }
 173 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
 174
 175 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
 176 {
 177         unsigned long flags = 0;
 178         if (substream->pcm->nonatomic)
 179                 mutex_lock_nested(&substream->self_group.mutex,
 180                                   SINGLE_DEPTH_NESTING);
 181         else
 182                 spin_lock_irqsave_nested(&substream->self_group.lock, flags,
 183                                          SINGLE_DEPTH_NESTING);
 184         return flags;
 185 }
 186 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
 187
 188 /**
 189  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
 190  * @substream: PCM substream
 191  * @flags: irq flags
 192  *
 193  * This is a counter-part of snd_pcm_stream_lock_irqsave().
 194  */
 195 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 196                                       unsigned long flags)
 197 {
 198         if (substream->pcm->nonatomic)
 199                 mutex_unlock(&substream->self_group.mutex);
 200         else
 201                 spin_unlock_irqrestore(&substream->self_group.lock, flags);
 202 }
 203 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
 204
 205 /* Run PCM ioctl ops */
 206 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
 207                              unsigned cmd, void *arg)
 208 {
 209         if (substream->ops->ioctl)
 210                 return substream->ops->ioctl(substream, cmd, arg);
 211         else
 212                 return snd_pcm_lib_ioctl(substream, cmd, arg);
 213 }
 214
 215 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
 216 {
 217         struct snd_pcm *pcm = substream->pcm;
 218         struct snd_pcm_str *pstr = substream->pstr;
 219
 220         memset(info, 0, sizeof(*info));
 221         info->card = pcm->card->number;
 222         info->device = pcm->device;
 223         info->stream = substream->stream;
 224         info->subdevice = substream->number;
 225         strscpy(info->id, pcm->id, sizeof(info->id));
 226         strscpy(info->name, pcm->name, sizeof(info->name));
 227         info->dev_class = pcm->dev_class;
 228         info->dev_subclass = pcm->dev_subclass;
 229         info->subdevices_count = pstr->substream_count;
 230         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 231         strscpy(info->subname, substream->name, sizeof(info->subname));
 232
 233         return 0;
 234 }
 235
 236 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 237                       struct snd_pcm_info __user * _info)
 238 {
 239         struct snd_pcm_info *info;
 240         int err;
 241
 242         info = kmalloc(sizeof(*info), GFP_KERNEL);
 243         if (! info)
 244                 return -ENOMEM;
 245         err = snd_pcm_info(substream, info);
 246         if (err >= 0) {
 247                 if (copy_to_user(_info, info, sizeof(*info)))
 248                         err = -EFAULT;
 249         }
 250         kfree(info);
 251         return err;
 252 }
 253
 254 /* macro for simplified cast */
 255 #define PARAM_MASK_BIT(b)       (1U << (__force int)(b))
 256
 257 static bool hw_support_mmap(struct snd_pcm_substream *substream)
 258 {
 259         struct snd_dma_buffer *dmabuf;
 260
 261         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 262                 return false;
 263
 264         if (substream->ops->mmap || substream->ops->page)
 265                 return true;
 266
 267         dmabuf = snd_pcm_get_dma_buf(substream);
 268         if (!dmabuf)
 269                 dmabuf = &substream->dma_buffer;
 270         switch (dmabuf->dev.type) {
 271         case SNDRV_DMA_TYPE_UNKNOWN:
 272                 /* we can't know the device, so just assume that the driver does
 273                  * everything right
 274                  */
 275                 return true;
 276         case SNDRV_DMA_TYPE_CONTINUOUS:
 277         case SNDRV_DMA_TYPE_VMALLOC:
 278                 return true;
 279         default:
 280                 return dma_can_mmap(dmabuf->dev.dev);
 281         }
 282 }
 283
 284 static int constrain_mask_params(struct snd_pcm_substream *substream,
 285                                  struct snd_pcm_hw_params *params)
 286 {
 287         struct snd_pcm_hw_constraints *constrs =
 288                                         &substream->runtime->hw_constraints;
 289         struct snd_mask *m;
 290         unsigned int k;
 291         struct snd_mask old_mask;
 292         int changed;
 293
 294         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 295                 m = hw_param_mask(params, k);
 296                 if (snd_mask_empty(m))
 297                         return -EINVAL;
 298
 299                 /* This parameter is not requested to change by a caller. */
 300                 if (!(params->rmask & PARAM_MASK_BIT(k)))
 301                         continue;
 302
 303                 if (trace_hw_mask_param_enabled())
 304                         old_mask = *m;
 305
 306                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 307                 if (changed < 0)
 308                         return changed;
 309                 if (changed == 0)
 310                         continue;
 311
 312                 /* Set corresponding flag so that the caller gets it. */
 313                 trace_hw_mask_param(substream, k, 0, &old_mask, m);
 314                 params->cmask |= PARAM_MASK_BIT(k);
 315         }
 316
 317         return 0;
 318 }
 319
 320 static int constrain_interval_params(struct snd_pcm_substream *substream,
 321                                      struct snd_pcm_hw_params *params)
 322 {
 323         struct snd_pcm_hw_constraints *constrs =
 324                                         &substream->runtime->hw_constraints;
 325         struct snd_interval *i;
 326         unsigned int k;
 327         struct snd_interval old_interval;
 328         int changed;
 329
 330         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 331                 i = hw_param_interval(params, k);
 332                 if (snd_interval_empty(i))
 333                         return -EINVAL;
 334
 335                 /* This parameter is not requested to change by a caller. */
 336                 if (!(params->rmask & PARAM_MASK_BIT(k)))
 337                         continue;
 338
 339                 if (trace_hw_interval_param_enabled())
 340                         old_interval = *i;
 341
 342                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 343                 if (changed < 0)
 344                         return changed;
 345                 if (changed == 0)
 346                         continue;
 347
 348                 /* Set corresponding flag so that the caller gets it. */
 349                 trace_hw_interval_param(substream, k, 0, &old_interval, i);
 350                 params->cmask |= PARAM_MASK_BIT(k);
 351         }
 352
 353         return 0;
 354 }
 355
 356 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
 357                                      struct snd_pcm_hw_params *params)
 358 {
 359         struct snd_pcm_hw_constraints *constrs =
 360                                         &substream->runtime->hw_constraints;
 361         unsigned int k;
 362         unsigned int *rstamps;
 363         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 364         unsigned int stamp;
 365         struct snd_pcm_hw_rule *r;
 366         unsigned int d;
 367         struct snd_mask old_mask;
 368         struct snd_interval old_interval;
 369         bool again;
 370         int changed, err = 0;
 371
 372         /*
 373          * Each application of rule has own sequence number.
 374          *
 375          * Each member of 'rstamps' array represents the sequence number of
 376          * recent application of corresponding rule.
 377          */
 378         rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
 379         if (!rstamps)
 380                 return -ENOMEM;
 381
 382         /*
 383          * Each member of 'vstamps' array represents the sequence number of
 384          * recent application of rule in which corresponding parameters were
 385          * changed.
 386          *
 387          * In initial state, elements corresponding to parameters requested by
 388          * a caller is 1. For unrequested parameters, corresponding members
 389          * have 0 so that the parameters are never changed anymore.
 390          */
 391         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 392                 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
 393
 394         /* Due to the above design, actual sequence number starts at 2. */
 395         stamp = 2;
 396 retry:
 397         /* Apply all rules in order. */
 398         again = false;
 399         for (k = 0; k < constrs->rules_num; k++) {
 400                 r = &constrs->rules[k];
 401
 402                 /*
 403                  * Check condition bits of this rule. When the rule has
 404                  * some condition bits, parameter without the bits is
 405                  * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
 406                  * is an example of the condition bits.
 407                  */
 408                 if (r->cond && !(r->cond & params->flags))
 409                         continue;
 410
 411                 /*
 412                  * The 'deps' array includes maximum four dependencies
 413                  * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
 414                  * member of this array is a sentinel and should be
 415                  * negative value.
 416                  *
 417                  * This rule should be processed in this time when dependent
 418                  * parameters were changed at former applications of the other
 419                  * rules.
 420                  */
 421                 for (d = 0; r->deps[d] >= 0; d++) {
 422                         if (vstamps[r->deps[d]] > rstamps[k])
 423                                 break;
 424                 }
 425                 if (r->deps[d] < 0)
 426                         continue;
 427
 428                 if (trace_hw_mask_param_enabled()) {
 429                         if (hw_is_mask(r->var))
 430                                 old_mask = *hw_param_mask(params, r->var);
 431                 }
 432                 if (trace_hw_interval_param_enabled()) {
 433                         if (hw_is_interval(r->var))
 434                                 old_interval = *hw_param_interval(params, r->var);
 435                 }
 436
 437                 changed = r->func(params, r);
 438                 if (changed < 0) {
 439                         err = changed;
 440                         goto out;
 441                 }
 442
 443                 /*
 444                  * When the parameter is changed, notify it to the caller
 445                  * by corresponding returned bit, then preparing for next
 446                  * iteration.
 447                  */
 448                 if (changed && r->var >= 0) {
 449                         if (hw_is_mask(r->var)) {
 450                                 trace_hw_mask_param(substream, r->var,
 451                                         k + 1, &old_mask,
 452                                         hw_param_mask(params, r->var));
 453                         }
 454                         if (hw_is_interval(r->var)) {
 455                                 trace_hw_interval_param(substream, r->var,
 456                                         k + 1, &old_interval,
 457                                         hw_param_interval(params, r->var));
 458                         }
 459
 460                         params->cmask |= PARAM_MASK_BIT(r->var);
 461                         vstamps[r->var] = stamp;
 462                         again = true;
 463                 }
 464
 465                 rstamps[k] = stamp++;
 466         }
 467
 468         /* Iterate to evaluate all rules till no parameters are changed. */
 469         if (again)
 470                 goto retry;
 471
 472  out:
 473         kfree(rstamps);
 474         return err;
 475 }
 476
 477 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
 478                                      struct snd_pcm_hw_params *params)
 479 {
 480         const struct snd_interval *i;
 481         const struct snd_mask *m;
 482         int err;
 483
 484         if (!params->msbits) {
 485                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 486                 if (snd_interval_single(i))
 487                         params->msbits = snd_interval_value(i);
 488         }
 489
 490         if (!params->rate_den) {
 491                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 492                 if (snd_interval_single(i)) {
 493                         params->rate_num = snd_interval_value(i);
 494                         params->rate_den = 1;
 495                 }
 496         }
 497
 498         if (!params->fifo_size) {
 499                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 500                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 501                 if (snd_mask_single(m) && snd_interval_single(i)) {
 502                         err = snd_pcm_ops_ioctl(substream,
 503                                                 SNDRV_PCM_IOCTL1_FIFO_SIZE,
 504                                                 params);
 505                         if (err < 0)
 506                                 return err;
 507                 }
 508         }
 509
 510         if (!params->info) {
 511                 params->info = substream->runtime->hw.info;
 512                 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
 513                                   SNDRV_PCM_INFO_DRAIN_TRIGGER);
 514                 if (!hw_support_mmap(substream))
 515                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
 516                                           SNDRV_PCM_INFO_MMAP_VALID);
 517         }
 518
 519         return 0;
 520 }
 521
 522 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 523                       struct snd_pcm_hw_params *params)
 524 {
 525         int err;
 526
 527         params->info = 0;
 528         params->fifo_size = 0;
 529         if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 530                 params->msbits = 0;
 531         if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
 532                 params->rate_num = 0;
 533                 params->rate_den = 0;
 534         }
 535
 536         err = constrain_mask_params(substream, params);
 537         if (err < 0)
 538                 return err;
 539
 540         err = constrain_interval_params(substream, params);
 541         if (err < 0)
 542                 return err;
 543
 544         err = constrain_params_by_rules(substream, params);
 545         if (err < 0)
 546                 return err;
 547
 548         params->rmask = 0;
 549
 550         return 0;
 551 }
 552 EXPORT_SYMBOL(snd_pcm_hw_refine);
 553
 554 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 555                                   struct snd_pcm_hw_params __user * _params)
 556 {
 557         struct snd_pcm_hw_params *params;
 558         int err;
 559
 560         params = memdup_user(_params, sizeof(*params));
 561         if (IS_ERR(params))
 562                 return PTR_ERR(params);
 563
 564         err = snd_pcm_hw_refine(substream, params);
 565         if (err < 0)
 566                 goto end;
 567
 568         err = fixup_unreferenced_params(substream, params);
 569         if (err < 0)
 570                 goto end;
 571
 572         if (copy_to_user(_params, params, sizeof(*params)))
 573                 err = -EFAULT;
 574 end:
 575         kfree(params);
 576         return err;
 577 }
 578
 579 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 580 {
 581         int usecs;
 582
 583         if (! runtime->rate)
 584                 return -1; /* invalid */
 585
 586         /* take 75% of period time as the deadline */
 587         usecs = (750000 / runtime->rate) * runtime->period_size;
 588         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 589                 runtime->rate;
 590
 591         return usecs;
 592 }
 593
 594 static void snd_pcm_set_state(struct snd_pcm_substream *substream,
 595                               snd_pcm_state_t state)
 596 {
 597         snd_pcm_stream_lock_irq(substream);
 598         if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
 599                 __snd_pcm_set_state(substream->runtime, state);
 600         snd_pcm_stream_unlock_irq(substream);
 601 }
 602
 603 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
 604                                         int event)
 605 {
 606 #ifdef CONFIG_SND_PCM_TIMER
 607         if (substream->timer)
 608                 snd_timer_notify(substream->timer, event,
 609                                         &substream->runtime->trigger_tstamp);
 610 #endif
 611 }
 612
 613 void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
 614 {
 615         if (substream->runtime && substream->runtime->stop_operating) {
 616                 substream->runtime->stop_operating = false;
 617                 if (substream->ops && substream->ops->sync_stop)
 618                         substream->ops->sync_stop(substream);
 619                 else if (sync_irq && substream->pcm->card->sync_irq > 0)
 620                         synchronize_irq(substream->pcm->card->sync_irq);
 621         }
 622 }
 623
 624 /**
 625  * snd_pcm_hw_params_choose - choose a configuration defined by @params
 626  * @pcm: PCM instance
 627  * @params: the hw_params instance
 628  *
 629  * Choose one configuration from configuration space defined by @params.
 630  * The configuration chosen is that obtained fixing in this order:
 631  * first access, first format, first subformat, min channels,
 632  * min rate, min period time, max buffer size, min tick time
 633  *
 634  * Return: Zero if successful, or a negative error code on failure.
 635  */
 636 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
 637                                     struct snd_pcm_hw_params *params)
 638 {
 639         static const int vars[] = {
 640                 SNDRV_PCM_HW_PARAM_ACCESS,
 641                 SNDRV_PCM_HW_PARAM_FORMAT,
 642                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
 643                 SNDRV_PCM_HW_PARAM_CHANNELS,
 644                 SNDRV_PCM_HW_PARAM_RATE,
 645                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 646                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 647                 SNDRV_PCM_HW_PARAM_TICK_TIME,
 648                 -1
 649         };
 650         const int *v;
 651         struct snd_mask old_mask;
 652         struct snd_interval old_interval;
 653         int changed;
 654
 655         for (v = vars; *v != -1; v++) {
 656                 /* Keep old parameter to trace. */
 657                 if (trace_hw_mask_param_enabled()) {
 658                         if (hw_is_mask(*v))
 659                                 old_mask = *hw_param_mask(params, *v);
 660                 }
 661                 if (trace_hw_interval_param_enabled()) {
 662                         if (hw_is_interval(*v))
 663                                 old_interval = *hw_param_interval(params, *v);
 664                 }
 665                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
 666                         changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
 667                 else
 668                         changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
 669                 if (changed < 0)
 670                         return changed;
 671                 if (changed == 0)
 672                         continue;
 673
 674                 /* Trace the changed parameter. */
 675                 if (hw_is_mask(*v)) {
 676                         trace_hw_mask_param(pcm, *v, 0, &old_mask,
 677                                             hw_param_mask(params, *v));
 678                 }
 679                 if (hw_is_interval(*v)) {
 680                         trace_hw_interval_param(pcm, *v, 0, &old_interval,
 681                                                 hw_param_interval(params, *v));
 682                 }
 683         }
 684
 685         return 0;
 686 }
 687
 688 /* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
 689  * block the further r/w operations
 690  */
 691 static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
 692 {
 693         if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
 694                 return -EBUSY;
 695         mutex_lock(&runtime->buffer_mutex);
 696         return 0; /* keep buffer_mutex, unlocked by below */
 697 }
 698
 699 /* release buffer_mutex and clear r/w access flag */
 700 static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
 701 {
 702         mutex_unlock(&runtime->buffer_mutex);
 703         atomic_inc(&runtime->buffer_accessing);
 704 }
 705
 706 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 707 #define is_oss_stream(substream)        ((substream)->oss.oss)
 708 #else
 709 #define is_oss_stream(substream)        false
 710 #endif
 711
 712 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 713                              struct snd_pcm_hw_params *params)
 714 {
 715         struct snd_pcm_runtime *runtime;
 716         int err, usecs;
 717         unsigned int bits;
 718         snd_pcm_uframes_t frames;
 719
 720         if (PCM_RUNTIME_CHECK(substream))
 721                 return -ENXIO;
 722         runtime = substream->runtime;
 723         err = snd_pcm_buffer_access_lock(runtime);
 724         if (err < 0)
 725                 return err;
 726         snd_pcm_stream_lock_irq(substream);
 727         switch (runtime->state) {
 728         case SNDRV_PCM_STATE_OPEN:
 729         case SNDRV_PCM_STATE_SETUP:
 730         case SNDRV_PCM_STATE_PREPARED:
 731                 if (!is_oss_stream(substream) &&
 732                     atomic_read(&substream->mmap_count))
 733                         err = -EBADFD;
 734                 break;
 735         default:
 736                 err = -EBADFD;
 737                 break;
 738         }
 739         snd_pcm_stream_unlock_irq(substream);
 740         if (err)
 741                 goto unlock;
 742
 743         snd_pcm_sync_stop(substream, true);
 744
 745         params->rmask = ~0U;
 746         err = snd_pcm_hw_refine(substream, params);
 747         if (err < 0)
 748                 goto _error;
 749
 750         err = snd_pcm_hw_params_choose(substream, params);
 751         if (err < 0)
 752                 goto _error;
 753
 754         err = fixup_unreferenced_params(substream, params);
 755         if (err < 0)
 756                 goto _error;
 757
 758         if (substream->managed_buffer_alloc) {
 759                 err = snd_pcm_lib_malloc_pages(substream,
 760                                                params_buffer_bytes(params));
 761                 if (err < 0)
 762                         goto _error;
 763                 runtime->buffer_changed = err > 0;
 764         }
 765
 766         if (substream->ops->hw_params != NULL) {
 767                 err = substream->ops->hw_params(substream, params);
 768                 if (err < 0)
 769                         goto _error;
 770         }
 771
 772         runtime->access = params_access(params);
 773         runtime->format = params_format(params);
 774         runtime->subformat = params_subformat(params);
 775         runtime->channels = params_channels(params);
 776         runtime->rate = params_rate(params);
 777         runtime->period_size = params_period_size(params);
 778         runtime->periods = params_periods(params);
 779         runtime->buffer_size = params_buffer_size(params);
 780         runtime->info = params->info;
 781         runtime->rate_num = params->rate_num;
 782         runtime->rate_den = params->rate_den;
 783         runtime->no_period_wakeup =
 784                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 785                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 786
 787         bits = snd_pcm_format_physical_width(runtime->format);
 788         runtime->sample_bits = bits;
 789         bits *= runtime->channels;
 790         runtime->frame_bits = bits;
 791         frames = 1;
 792         while (bits % 8 != 0) {
 793                 bits *= 2;
 794                 frames *= 2;
 795         }
 796         runtime->byte_align = bits / 8;
 797         runtime->min_align = frames;
 798
 799         /* Default sw params */
 800         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 801         runtime->period_step = 1;
 802         runtime->control->avail_min = runtime->period_size;
 803         runtime->start_threshold = 1;
 804         runtime->stop_threshold = runtime->buffer_size;
 805         runtime->silence_threshold = 0;
 806         runtime->silence_size = 0;
 807         runtime->boundary = runtime->buffer_size;
 808         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 809                 runtime->boundary *= 2;
 810
 811         /* clear the buffer for avoiding possible kernel info leaks */
 812         if (runtime->dma_area && !substream->ops->copy_user) {
 813                 size_t size = runtime->dma_bytes;
 814
 815                 if (runtime->info & SNDRV_PCM_INFO_MMAP)
 816                         size = PAGE_ALIGN(size);
 817                 memset(runtime->dma_area, 0, size);
 818         }
 819
 820         snd_pcm_timer_resolution_change(substream);
 821         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 822
 823         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
 824                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
 825         usecs = period_to_usecs(runtime);
 826         if (usecs >= 0)
 827                 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
 828                                             usecs);
 829         err = 0;
 830  _error:
 831         if (err) {
 832                 /* hardware might be unusable from this time,
 833                  * so we force application to retry to set
 834                  * the correct hardware parameter settings
 835                  */
 836                 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 837                 if (substream->ops->hw_free != NULL)
 838                         substream->ops->hw_free(substream);
 839                 if (substream->managed_buffer_alloc)
 840                         snd_pcm_lib_free_pages(substream);
 841         }
 842  unlock:
 843         snd_pcm_buffer_access_unlock(runtime);
 844         return err;
 845 }
 846
 847 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 848                                   struct snd_pcm_hw_params __user * _params)
 849 {
 850         struct snd_pcm_hw_params *params;
 851         int err;
 852
 853         params = memdup_user(_params, sizeof(*params));
 854         if (IS_ERR(params))
 855                 return PTR_ERR(params);
 856
 857         err = snd_pcm_hw_params(substream, params);
 858         if (err < 0)
 859                 goto end;
 860
 861         if (copy_to_user(_params, params, sizeof(*params)))
 862                 err = -EFAULT;
 863 end:
 864         kfree(params);
 865         return err;
 866 }
 867
 868 static int do_hw_free(struct snd_pcm_substream *substream)
 869 {
 870         int result = 0;
 871
 872         snd_pcm_sync_stop(substream, true);
 873         if (substream->ops->hw_free)
 874                 result = substream->ops->hw_free(substream);
 875         if (substream->managed_buffer_alloc)
 876                 snd_pcm_lib_free_pages(substream);
 877         return result;
 878 }
 879
 880 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 881 {
 882         struct snd_pcm_runtime *runtime;
 883         int result = 0;
 884
 885         if (PCM_RUNTIME_CHECK(substream))
 886                 return -ENXIO;
 887         runtime = substream->runtime;
 888         result = snd_pcm_buffer_access_lock(runtime);
 889         if (result < 0)
 890                 return result;
 891         snd_pcm_stream_lock_irq(substream);
 892         switch (runtime->state) {
 893         case SNDRV_PCM_STATE_SETUP:
 894         case SNDRV_PCM_STATE_PREPARED:
 895                 if (atomic_read(&substream->mmap_count))
 896                         result = -EBADFD;
 897                 break;
 898         default:
 899                 result = -EBADFD;
 900                 break;
 901         }
 902         snd_pcm_stream_unlock_irq(substream);
 903         if (result)
 904                 goto unlock;
 905         result = do_hw_free(substream);
 906         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 907         cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
 908  unlock:
 909         snd_pcm_buffer_access_unlock(runtime);
 910         return result;
 911 }
 912
 913 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 914                              struct snd_pcm_sw_params *params)
 915 {
 916         struct snd_pcm_runtime *runtime;
 917         int err;
 918
 919         if (PCM_RUNTIME_CHECK(substream))
 920                 return -ENXIO;
 921         runtime = substream->runtime;
 922         snd_pcm_stream_lock_irq(substream);
 923         if (runtime->state == SNDRV_PCM_STATE_OPEN) {
 924                 snd_pcm_stream_unlock_irq(substream);
 925                 return -EBADFD;
 926         }
 927         snd_pcm_stream_unlock_irq(substream);
 928
 929         if (params->tstamp_mode < 0 ||
 930             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 931                 return -EINVAL;
 932         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 933             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 934                 return -EINVAL;
 935         if (params->avail_min == 0)
 936                 return -EINVAL;
 937         if (params->silence_size >= runtime->boundary) {
 938                 if (params->silence_threshold != 0)
 939                         return -EINVAL;
 940         } else {
 941                 if (params->silence_size > params->silence_threshold)
 942                         return -EINVAL;
 943                 if (params->silence_threshold > runtime->buffer_size)
 944                         return -EINVAL;
 945         }
 946         err = 0;
 947         snd_pcm_stream_lock_irq(substream);
 948         runtime->tstamp_mode = params->tstamp_mode;
 949         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 950                 runtime->tstamp_type = params->tstamp_type;
 951         runtime->period_step = params->period_step;
 952         runtime->control->avail_min = params->avail_min;
 953         runtime->start_threshold = params->start_threshold;
 954         runtime->stop_threshold = params->stop_threshold;
 955         runtime->silence_threshold = params->silence_threshold;
 956         runtime->silence_size = params->silence_size;
 957         params->boundary = runtime->boundary;
 958         if (snd_pcm_running(substream)) {
 959                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 960                     runtime->silence_size > 0)
 961                         snd_pcm_playback_silence(substream, ULONG_MAX);
 962                 err = snd_pcm_update_state(substream, runtime);
 963         }
 964         snd_pcm_stream_unlock_irq(substream);
 965         return err;
 966 }
 967
 968 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 969                                   struct snd_pcm_sw_params __user * _params)
 970 {
 971         struct snd_pcm_sw_params params;
 972         int err;
 973         if (copy_from_user(&params, _params, sizeof(params)))
 974                 return -EFAULT;
 975         err = snd_pcm_sw_params(substream, &params);
 976         if (copy_to_user(_params, &params, sizeof(params)))
 977                 return -EFAULT;
 978         return err;
 979 }
 980
 981 static inline snd_pcm_uframes_t
 982 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
 983 {
 984         snd_pcm_uframes_t delay;
 985
 986         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 987                 delay = snd_pcm_playback_hw_avail(substream->runtime);
 988         else
 989                 delay = snd_pcm_capture_avail(substream->runtime);
 990         return delay + substream->runtime->delay;
 991 }
 992
 993 int snd_pcm_status64(struct snd_pcm_substream *substream,
 994                      struct snd_pcm_status64 *status)
 995 {
 996         struct snd_pcm_runtime *runtime = substream->runtime;
 997
 998         snd_pcm_stream_lock_irq(substream);
 999
1000         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1001                                         &runtime->audio_tstamp_config);
1002
1003         /* backwards compatible behavior */
1004         if (runtime->audio_tstamp_config.type_requested ==
1005                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1006                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1007                         runtime->audio_tstamp_config.type_requested =
1008                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1009                 else
1010                         runtime->audio_tstamp_config.type_requested =
1011                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1012                 runtime->audio_tstamp_report.valid = 0;
1013         } else
1014                 runtime->audio_tstamp_report.valid = 1;
1015
1016         status->state = runtime->state;
1017         status->suspended_state = runtime->suspended_state;
1018         if (status->state == SNDRV_PCM_STATE_OPEN)
1019                 goto _end;
1020         status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1021         status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1022         if (snd_pcm_running(substream)) {
1023                 snd_pcm_update_hw_ptr(substream);
1024                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1025                         status->tstamp_sec = runtime->status->tstamp.tv_sec;
1026                         status->tstamp_nsec =
1027                                 runtime->status->tstamp.tv_nsec;
1028                         status->driver_tstamp_sec =
1029                                 runtime->driver_tstamp.tv_sec;
1030                         status->driver_tstamp_nsec =
1031                                 runtime->driver_tstamp.tv_nsec;
1032                         status->audio_tstamp_sec =
1033                                 runtime->status->audio_tstamp.tv_sec;
1034                         status->audio_tstamp_nsec =
1035                                 runtime->status->audio_tstamp.tv_nsec;
1036                         if (runtime->audio_tstamp_report.valid == 1)
1037                                 /* backwards compatibility, no report provided in COMPAT mode */
1038                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1039                                                                 &status->audio_tstamp_accuracy,
1040                                                                 &runtime->audio_tstamp_report);
1041
1042                         goto _tstamp_end;
1043                 }
1044         } else {
1045                 /* get tstamp only in fallback mode and only if enabled */
1046                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1047                         struct timespec64 tstamp;
1048
1049                         snd_pcm_gettime(runtime, &tstamp);
1050                         status->tstamp_sec = tstamp.tv_sec;
1051                         status->tstamp_nsec = tstamp.tv_nsec;
1052                 }
1053         }
1054  _tstamp_end:
1055         status->appl_ptr = runtime->control->appl_ptr;
1056         status->hw_ptr = runtime->status->hw_ptr;
1057         status->avail = snd_pcm_avail(substream);
1058         status->delay = snd_pcm_running(substream) ?
1059                 snd_pcm_calc_delay(substream) : 0;
1060         status->avail_max = runtime->avail_max;
1061         status->overrange = runtime->overrange;
1062         runtime->avail_max = 0;
1063         runtime->overrange = 0;
1064  _end:
1065         snd_pcm_stream_unlock_irq(substream);
1066         return 0;
1067 }
1068
1069 static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1070                                  struct snd_pcm_status64 __user * _status,
1071                                  bool ext)
1072 {
1073         struct snd_pcm_status64 status;
1074         int res;
1075
1076         memset(&status, 0, sizeof(status));
1077         /*
1078          * with extension, parameters are read/write,
1079          * get audio_tstamp_data from user,
1080          * ignore rest of status structure
1081          */
1082         if (ext && get_user(status.audio_tstamp_data,
1083                                 (u32 __user *)(&_status->audio_tstamp_data)))
1084                 return -EFAULT;
1085         res = snd_pcm_status64(substream, &status);
1086         if (res < 0)
1087                 return res;
1088         if (copy_to_user(_status, &status, sizeof(status)))
1089                 return -EFAULT;
1090         return 0;
1091 }
1092
1093 static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1094                                  struct snd_pcm_status32 __user * _status,
1095                                  bool ext)
1096 {
1097         struct snd_pcm_status64 status64;
1098         struct snd_pcm_status32 status32;
1099         int res;
1100
1101         memset(&status64, 0, sizeof(status64));
1102         memset(&status32, 0, sizeof(status32));
1103         /*
1104          * with extension, parameters are read/write,
1105          * get audio_tstamp_data from user,
1106          * ignore rest of status structure
1107          */
1108         if (ext && get_user(status64.audio_tstamp_data,
1109                             (u32 __user *)(&_status->audio_tstamp_data)))
1110                 return -EFAULT;
1111         res = snd_pcm_status64(substream, &status64);
1112         if (res < 0)
1113                 return res;
1114
1115         status32 = (struct snd_pcm_status32) {
1116                 .state = status64.state,
1117                 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1118                 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1119                 .tstamp_sec = status64.tstamp_sec,
1120                 .tstamp_nsec = status64.tstamp_nsec,
1121                 .appl_ptr = status64.appl_ptr,
1122                 .hw_ptr = status64.hw_ptr,
1123                 .delay = status64.delay,
1124                 .avail = status64.avail,
1125                 .avail_max = status64.avail_max,
1126                 .overrange = status64.overrange,
1127                 .suspended_state = status64.suspended_state,
1128                 .audio_tstamp_data = status64.audio_tstamp_data,
1129                 .audio_tstamp_sec = status64.audio_tstamp_sec,
1130                 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1131                 .driver_tstamp_sec = status64.audio_tstamp_sec,
1132                 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1133                 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1134         };
1135
1136         if (copy_to_user(_status, &status32, sizeof(status32)))
1137                 return -EFAULT;
1138
1139         return 0;
1140 }
1141
1142 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1143                                 struct snd_pcm_channel_info * info)
1144 {
1145         struct snd_pcm_runtime *runtime;
1146         unsigned int channel;
1147
1148         channel = info->channel;
1149         runtime = substream->runtime;
1150         snd_pcm_stream_lock_irq(substream);
1151         if (runtime->state == SNDRV_PCM_STATE_OPEN) {
1152                 snd_pcm_stream_unlock_irq(substream);
1153                 return -EBADFD;
1154         }
1155         snd_pcm_stream_unlock_irq(substream);
1156         if (channel >= runtime->channels)
1157                 return -EINVAL;
1158         memset(info, 0, sizeof(*info));
1159         info->channel = channel;
1160         return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1161 }
1162
1163 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1164                                      struct snd_pcm_channel_info __user * _info)
1165 {
1166         struct snd_pcm_channel_info info;
1167         int res;
1168
1169         if (copy_from_user(&info, _info, sizeof(info)))
1170                 return -EFAULT;
1171         res = snd_pcm_channel_info(substream, &info);
1172         if (res < 0)
1173                 return res;
1174         if (copy_to_user(_info, &info, sizeof(info)))
1175                 return -EFAULT;
1176         return 0;
1177 }
1178
1179 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1180 {
1181         struct snd_pcm_runtime *runtime = substream->runtime;
1182         if (runtime->trigger_master == NULL)
1183                 return;
1184         if (runtime->trigger_master == substream) {
1185                 if (!runtime->trigger_tstamp_latched)
1186                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1187         } else {
1188                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1189                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1190         }
1191         runtime->trigger_master = NULL;
1192 }
1193
1194 #define ACTION_ARG_IGNORE       (__force snd_pcm_state_t)0
1195
1196 struct action_ops {
1197         int (*pre_action)(struct snd_pcm_substream *substream,
1198                           snd_pcm_state_t state);
1199         int (*do_action)(struct snd_pcm_substream *substream,
1200                          snd_pcm_state_t state);
1201         void (*undo_action)(struct snd_pcm_substream *substream,
1202                             snd_pcm_state_t state);
1203         void (*post_action)(struct snd_pcm_substream *substream,
1204                             snd_pcm_state_t state);
1205 };
1206
1207 /*
1208  *  this functions is core for handling of linked stream
1209  *  Note: the stream state might be changed also on failure
1210  *  Note2: call with calling stream lock + link lock
1211  */
1212 static int snd_pcm_action_group(const struct action_ops *ops,
1213                                 struct snd_pcm_substream *substream,
1214                                 snd_pcm_state_t state,
1215                                 bool stream_lock)
1216 {
1217         struct snd_pcm_substream *s = NULL;
1218         struct snd_pcm_substream *s1;
1219         int res = 0, depth = 1;
1220
1221         snd_pcm_group_for_each_entry(s, substream) {
1222                 if (s != substream) {
1223                         if (!stream_lock)
1224                                 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1225                         else if (s->pcm->nonatomic)
1226                                 mutex_lock_nested(&s->self_group.mutex, depth);
1227                         else
1228                                 spin_lock_nested(&s->self_group.lock, depth);
1229                         depth++;
1230                 }
1231                 res = ops->pre_action(s, state);
1232                 if (res < 0)
1233                         goto _unlock;
1234         }
1235         snd_pcm_group_for_each_entry(s, substream) {
1236                 res = ops->do_action(s, state);
1237                 if (res < 0) {
1238                         if (ops->undo_action) {
1239                                 snd_pcm_group_for_each_entry(s1, substream) {
1240                                         if (s1 == s) /* failed stream */
1241                                                 break;
1242                                         ops->undo_action(s1, state);
1243                                 }
1244                         }
1245                         s = NULL; /* unlock all */
1246                         goto _unlock;
1247                 }
1248         }
1249         snd_pcm_group_for_each_entry(s, substream) {
1250                 ops->post_action(s, state);
1251         }
1252  _unlock:
1253         /* unlock streams */
1254         snd_pcm_group_for_each_entry(s1, substream) {
1255                 if (s1 != substream) {
1256                         if (!stream_lock)
1257                                 mutex_unlock(&s1->runtime->buffer_mutex);
1258                         else if (s1->pcm->nonatomic)
1259                                 mutex_unlock(&s1->self_group.mutex);
1260                         else
1261                                 spin_unlock(&s1->self_group.lock);
1262                 }
1263                 if (s1 == s)    /* end */
1264                         break;
1265         }
1266         return res;
1267 }
1268
1269 /*
1270  *  Note: call with stream lock
1271  */
1272 static int snd_pcm_action_single(const struct action_ops *ops,
1273                                  struct snd_pcm_substream *substream,
1274                                  snd_pcm_state_t state)
1275 {
1276         int res;
1277
1278         res = ops->pre_action(substream, state);
1279         if (res < 0)
1280                 return res;
1281         res = ops->do_action(substream, state);
1282         if (res == 0)
1283                 ops->post_action(substream, state);
1284         else if (ops->undo_action)
1285                 ops->undo_action(substream, state);
1286         return res;
1287 }
1288
1289 static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1290                                  struct snd_pcm_group *new_group)
1291 {
1292         substream->group = new_group;
1293         list_move(&substream->link_list, &new_group->substreams);
1294 }
1295
1296 /*
1297  * Unref and unlock the group, but keep the stream lock;
1298  * when the group becomes empty and no longer referred, destroy itself
1299  */
1300 static void snd_pcm_group_unref(struct snd_pcm_group *group,
1301                                 struct snd_pcm_substream *substream)
1302 {
1303         bool do_free;
1304
1305         if (!group)
1306                 return;
1307         do_free = refcount_dec_and_test(&group->refs);
1308         snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1309         if (do_free)
1310                 kfree(group);
1311 }
1312
1313 /*
1314  * Lock the group inside a stream lock and reference it;
1315  * return the locked group object, or NULL if not linked
1316  */
1317 static struct snd_pcm_group *
1318 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1319 {
1320         bool nonatomic = substream->pcm->nonatomic;
1321         struct snd_pcm_group *group;
1322         bool trylock;
1323
1324         for (;;) {
1325                 if (!snd_pcm_stream_linked(substream))
1326                         return NULL;
1327                 group = substream->group;
1328                 /* block freeing the group object */
1329                 refcount_inc(&group->refs);
1330
1331                 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1332                         spin_trylock(&group->lock);
1333                 if (trylock)
1334                         break; /* OK */
1335
1336                 /* re-lock for avoiding ABBA deadlock */
1337                 snd_pcm_stream_unlock(substream);
1338                 snd_pcm_group_lock(group, nonatomic);
1339                 snd_pcm_stream_lock(substream);
1340
1341                 /* check the group again; the above opens a small race window */
1342                 if (substream->group == group)
1343                         break; /* OK */
1344                 /* group changed, try again */
1345                 snd_pcm_group_unref(group, substream);
1346         }
1347         return group;
1348 }
1349
1350 /*
1351  *  Note: call with stream lock
1352  */
1353 static int snd_pcm_action(const struct action_ops *ops,
1354                           struct snd_pcm_substream *substream,
1355                           snd_pcm_state_t state)
1356 {
1357         struct snd_pcm_group *group;
1358         int res;
1359
1360         group = snd_pcm_stream_group_ref(substream);
1361         if (group)
1362                 res = snd_pcm_action_group(ops, substream, state, true);
1363         else
1364                 res = snd_pcm_action_single(ops, substream, state);
1365         snd_pcm_group_unref(group, substream);
1366         return res;
1367 }
1368
1369 /*
1370  *  Note: don't use any locks before
1371  */
1372 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1373                                    struct snd_pcm_substream *substream,
1374                                    snd_pcm_state_t state)
1375 {
1376         int res;
1377
1378         snd_pcm_stream_lock_irq(substream);
1379         res = snd_pcm_action(ops, substream, state);
1380         snd_pcm_stream_unlock_irq(substream);
1381         return res;
1382 }
1383
1384 /*
1385  */
1386 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1387                                     struct snd_pcm_substream *substream,
1388                                     snd_pcm_state_t state)
1389 {
1390         int res;
1391
1392         /* Guarantee the group members won't change during non-atomic action */
1393         down_read(&snd_pcm_link_rwsem);
1394         res = snd_pcm_buffer_access_lock(substream->runtime);
1395         if (res < 0)
1396                 goto unlock;
1397         if (snd_pcm_stream_linked(substream))
1398                 res = snd_pcm_action_group(ops, substream, state, false);
1399         else
1400                 res = snd_pcm_action_single(ops, substream, state);
1401         snd_pcm_buffer_access_unlock(substream->runtime);
1402  unlock:
1403         up_read(&snd_pcm_link_rwsem);
1404         return res;
1405 }
1406
1407 /*
1408  * start callbacks
1409  */
1410 static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1411                              snd_pcm_state_t state)
1412 {
1413         struct snd_pcm_runtime *runtime = substream->runtime;
1414         if (runtime->state != SNDRV_PCM_STATE_PREPARED)
1415                 return -EBADFD;
1416         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1417             !snd_pcm_playback_data(substream))
1418                 return -EPIPE;
1419         runtime->trigger_tstamp_latched = false;
1420         runtime->trigger_master = substream;
1421         return 0;
1422 }
1423
1424 static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1425                             snd_pcm_state_t state)
1426 {
1427         if (substream->runtime->trigger_master != substream)
1428                 return 0;
1429         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1430 }
1431
1432 static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1433                                snd_pcm_state_t state)
1434 {
1435         if (substream->runtime->trigger_master == substream)
1436                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1437 }
1438
1439 static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1440                                snd_pcm_state_t state)
1441 {
1442         struct snd_pcm_runtime *runtime = substream->runtime;
1443         snd_pcm_trigger_tstamp(substream);
1444         runtime->hw_ptr_jiffies = jiffies;
1445         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1446                                                             runtime->rate;
1447         __snd_pcm_set_state(runtime, state);
1448         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1449             runtime->silence_size > 0)
1450                 snd_pcm_playback_silence(substream, ULONG_MAX);
1451         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1452 }
1453
1454 static const struct action_ops snd_pcm_action_start = {
1455         .pre_action = snd_pcm_pre_start,
1456         .do_action = snd_pcm_do_start,
1457         .undo_action = snd_pcm_undo_start,
1458         .post_action = snd_pcm_post_start
1459 };
1460
1461 /**
1462  * snd_pcm_start - start all linked streams
1463  * @substream: the PCM substream instance
1464  *
1465  * Return: Zero if successful, or a negative error code.
1466  * The stream lock must be acquired before calling this function.
1467  */
1468 int snd_pcm_start(struct snd_pcm_substream *substream)
1469 {
1470         return snd_pcm_action(&snd_pcm_action_start, substream,
1471                               SNDRV_PCM_STATE_RUNNING);
1472 }
1473
1474 /* take the stream lock and start the streams */
1475 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1476 {
1477         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1478                                        SNDRV_PCM_STATE_RUNNING);
1479 }
1480
1481 /*
1482  * stop callbacks
1483  */
1484 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1485                             snd_pcm_state_t state)
1486 {
1487         struct snd_pcm_runtime *runtime = substream->runtime;
1488         if (runtime->state == SNDRV_PCM_STATE_OPEN)
1489                 return -EBADFD;
1490         runtime->trigger_master = substream;
1491         return 0;
1492 }
1493
1494 static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1495                            snd_pcm_state_t state)
1496 {
1497         if (substream->runtime->trigger_master == substream &&
1498             snd_pcm_running(substream)) {
1499                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1500                 substream->runtime->stop_operating = true;
1501         }
1502         return 0; /* unconditionally stop all substreams */
1503 }
1504
1505 static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1506                               snd_pcm_state_t state)
1507 {
1508         struct snd_pcm_runtime *runtime = substream->runtime;
1509         if (runtime->state != state) {
1510                 snd_pcm_trigger_tstamp(substream);
1511                 __snd_pcm_set_state(runtime, state);
1512                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1513         }
1514         wake_up(&runtime->sleep);
1515         wake_up(&runtime->tsleep);
1516 }
1517
1518 static const struct action_ops snd_pcm_action_stop = {
1519         .pre_action = snd_pcm_pre_stop,
1520         .do_action = snd_pcm_do_stop,
1521         .post_action = snd_pcm_post_stop
1522 };
1523
1524 /**
1525  * snd_pcm_stop - try to stop all running streams in the substream group
1526  * @substream: the PCM substream instance
1527  * @state: PCM state after stopping the stream
1528  *
1529  * The state of each stream is then changed to the given state unconditionally.
1530  *
1531  * Return: Zero if successful, or a negative error code.
1532  */
1533 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1534 {
1535         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1536 }
1537 EXPORT_SYMBOL(snd_pcm_stop);
1538
1539 /**
1540  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1541  * @substream: the PCM substream
1542  *
1543  * After stopping, the state is changed to SETUP.
1544  * Unlike snd_pcm_stop(), this affects only the given stream.
1545  *
1546  * Return: Zero if successful, or a negative error code.
1547  */
1548 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1549 {
1550         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1551                                      SNDRV_PCM_STATE_SETUP);
1552 }
1553
1554 /**
1555  * snd_pcm_stop_xrun - stop the running streams as XRUN
1556  * @substream: the PCM substream instance
1557  *
1558  * This stops the given running substream (and all linked substreams) as XRUN.
1559  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1560  *
1561  * Return: Zero if successful, or a negative error code.
1562  */
1563 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1564 {
1565         unsigned long flags;
1566
1567         snd_pcm_stream_lock_irqsave(substream, flags);
1568         if (substream->runtime && snd_pcm_running(substream))
1569                 __snd_pcm_xrun(substream);
1570         snd_pcm_stream_unlock_irqrestore(substream, flags);
1571         return 0;
1572 }
1573 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1574
1575 /*
1576  * pause callbacks: pass boolean (to start pause or resume) as state argument
1577  */
1578 #define pause_pushed(state)     (__force bool)(state)
1579
1580 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1581                              snd_pcm_state_t state)
1582 {
1583         struct snd_pcm_runtime *runtime = substream->runtime;
1584         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1585                 return -ENOSYS;
1586         if (pause_pushed(state)) {
1587                 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1588                         return -EBADFD;
1589         } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1590                 return -EBADFD;
1591         runtime->trigger_master = substream;
1592         return 0;
1593 }
1594
1595 static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1596                             snd_pcm_state_t state)
1597 {
1598         if (substream->runtime->trigger_master != substream)
1599                 return 0;
1600         /* some drivers might use hw_ptr to recover from the pause -
1601            update the hw_ptr now */
1602         if (pause_pushed(state))
1603                 snd_pcm_update_hw_ptr(substream);
1604         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1605          * a delta between the current jiffies, this gives a large enough
1606          * delta, effectively to skip the check once.
1607          */
1608         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1609         return substream->ops->trigger(substream,
1610                                        pause_pushed(state) ?
1611                                        SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1612                                        SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1613 }
1614
1615 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1616                                snd_pcm_state_t state)
1617 {
1618         if (substream->runtime->trigger_master == substream)
1619                 substream->ops->trigger(substream,
1620                                         pause_pushed(state) ?
1621                                         SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1622                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1623 }
1624
1625 static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1626                                snd_pcm_state_t state)
1627 {
1628         struct snd_pcm_runtime *runtime = substream->runtime;
1629         snd_pcm_trigger_tstamp(substream);
1630         if (pause_pushed(state)) {
1631                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1632                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1633                 wake_up(&runtime->sleep);
1634                 wake_up(&runtime->tsleep);
1635         } else {
1636                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1637                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1638         }
1639 }
1640
1641 static const struct action_ops snd_pcm_action_pause = {
1642         .pre_action = snd_pcm_pre_pause,
1643         .do_action = snd_pcm_do_pause,
1644         .undo_action = snd_pcm_undo_pause,
1645         .post_action = snd_pcm_post_pause
1646 };
1647
1648 /*
1649  * Push/release the pause for all linked streams.
1650  */
1651 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1652 {
1653         return snd_pcm_action(&snd_pcm_action_pause, substream,
1654                               (__force snd_pcm_state_t)push);
1655 }
1656
1657 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1658                                   bool push)
1659 {
1660         return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1661                                        (__force snd_pcm_state_t)push);
1662 }
1663
1664 #ifdef CONFIG_PM
1665 /* suspend callback: state argument ignored */
1666
1667 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1668                                snd_pcm_state_t state)
1669 {
1670         struct snd_pcm_runtime *runtime = substream->runtime;
1671         switch (runtime->state) {
1672         case SNDRV_PCM_STATE_SUSPENDED:
1673                 return -EBUSY;
1674         /* unresumable PCM state; return -EBUSY for skipping suspend */
1675         case SNDRV_PCM_STATE_OPEN:
1676         case SNDRV_PCM_STATE_SETUP:
1677         case SNDRV_PCM_STATE_DISCONNECTED:
1678                 return -EBUSY;
1679         }
1680         runtime->trigger_master = substream;
1681         return 0;
1682 }
1683
1684 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1685                               snd_pcm_state_t state)
1686 {
1687         struct snd_pcm_runtime *runtime = substream->runtime;
1688         if (runtime->trigger_master != substream)
1689                 return 0;
1690         if (! snd_pcm_running(substream))
1691                 return 0;
1692         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1693         runtime->stop_operating = true;
1694         return 0; /* suspend unconditionally */
1695 }
1696
1697 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1698                                  snd_pcm_state_t state)
1699 {
1700         struct snd_pcm_runtime *runtime = substream->runtime;
1701         snd_pcm_trigger_tstamp(substream);
1702         runtime->suspended_state = runtime->state;
1703         runtime->status->suspended_state = runtime->suspended_state;
1704         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1705         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1706         wake_up(&runtime->sleep);
1707         wake_up(&runtime->tsleep);
1708 }
1709
1710 static const struct action_ops snd_pcm_action_suspend = {
1711         .pre_action = snd_pcm_pre_suspend,
1712         .do_action = snd_pcm_do_suspend,
1713         .post_action = snd_pcm_post_suspend
1714 };
1715
1716 /*
1717  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1718  * @substream: the PCM substream
1719  *
1720  * After this call, all streams are changed to SUSPENDED state.
1721  *
1722  * Return: Zero if successful, or a negative error code.
1723  */
1724 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1725 {
1726         int err;
1727         unsigned long flags;
1728
1729         snd_pcm_stream_lock_irqsave(substream, flags);
1730         err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1731                              ACTION_ARG_IGNORE);
1732         snd_pcm_stream_unlock_irqrestore(substream, flags);
1733         return err;
1734 }
1735
1736 /**
1737  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1738  * @pcm: the PCM instance
1739  *
1740  * After this call, all streams are changed to SUSPENDED state.
1741  *
1742  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1743  */
1744 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1745 {
1746         struct snd_pcm_substream *substream;
1747         int stream, err = 0;
1748
1749         if (! pcm)
1750                 return 0;
1751
1752         for_each_pcm_substream(pcm, stream, substream) {
1753                 /* FIXME: the open/close code should lock this as well */
1754                 if (!substream->runtime)
1755                         continue;
1756
1757                 /*
1758                  * Skip BE dai link PCM's that are internal and may
1759                  * not have their substream ops set.
1760                  */
1761                 if (!substream->ops)
1762                         continue;
1763
1764                 err = snd_pcm_suspend(substream);
1765                 if (err < 0 && err != -EBUSY)
1766                         return err;
1767         }
1768
1769         for_each_pcm_substream(pcm, stream, substream)
1770                 snd_pcm_sync_stop(substream, false);
1771
1772         return 0;
1773 }
1774 EXPORT_SYMBOL(snd_pcm_suspend_all);
1775
1776 /* resume callbacks: state argument ignored */
1777
1778 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1779                               snd_pcm_state_t state)
1780 {
1781         struct snd_pcm_runtime *runtime = substream->runtime;
1782         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1783                 return -ENOSYS;
1784         runtime->trigger_master = substream;
1785         return 0;
1786 }
1787
1788 static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1789                              snd_pcm_state_t state)
1790 {
1791         struct snd_pcm_runtime *runtime = substream->runtime;
1792         if (runtime->trigger_master != substream)
1793                 return 0;
1794         /* DMA not running previously? */
1795         if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1796             (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1797              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1798                 return 0;
1799         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1800 }
1801
1802 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1803                                 snd_pcm_state_t state)
1804 {
1805         if (substream->runtime->trigger_master == substream &&
1806             snd_pcm_running(substream))
1807                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1808 }
1809
1810 static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1811                                 snd_pcm_state_t state)
1812 {
1813         struct snd_pcm_runtime *runtime = substream->runtime;
1814         snd_pcm_trigger_tstamp(substream);
1815         __snd_pcm_set_state(runtime, runtime->suspended_state);
1816         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1817 }
1818
1819 static const struct action_ops snd_pcm_action_resume = {
1820         .pre_action = snd_pcm_pre_resume,
1821         .do_action = snd_pcm_do_resume,
1822         .undo_action = snd_pcm_undo_resume,
1823         .post_action = snd_pcm_post_resume
1824 };
1825
1826 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1827 {
1828         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1829                                        ACTION_ARG_IGNORE);
1830 }
1831
1832 #else
1833
1834 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1835 {
1836         return -ENOSYS;
1837 }
1838
1839 #endif /* CONFIG_PM */
1840
1841 /*
1842  * xrun ioctl
1843  *
1844  * Change the RUNNING stream(s) to XRUN state.
1845  */
1846 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1847 {
1848         struct snd_pcm_runtime *runtime = substream->runtime;
1849         int result;
1850
1851         snd_pcm_stream_lock_irq(substream);
1852         switch (runtime->state) {
1853         case SNDRV_PCM_STATE_XRUN:
1854                 result = 0;     /* already there */
1855                 break;
1856         case SNDRV_PCM_STATE_RUNNING:
1857                 __snd_pcm_xrun(substream);
1858                 result = 0;
1859                 break;
1860         default:
1861                 result = -EBADFD;
1862         }
1863         snd_pcm_stream_unlock_irq(substream);
1864         return result;
1865 }
1866
1867 /*
1868  * reset ioctl
1869  */
1870 /* reset callbacks:  state argument ignored */
1871 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1872                              snd_pcm_state_t state)
1873 {
1874         struct snd_pcm_runtime *runtime = substream->runtime;
1875         switch (runtime->state) {
1876         case SNDRV_PCM_STATE_RUNNING:
1877         case SNDRV_PCM_STATE_PREPARED:
1878         case SNDRV_PCM_STATE_PAUSED:
1879         case SNDRV_PCM_STATE_SUSPENDED:
1880                 return 0;
1881         default:
1882                 return -EBADFD;
1883         }
1884 }
1885
1886 static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1887                             snd_pcm_state_t state)
1888 {
1889         struct snd_pcm_runtime *runtime = substream->runtime;
1890         int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1891         if (err < 0)
1892                 return err;
1893         snd_pcm_stream_lock_irq(substream);
1894         runtime->hw_ptr_base = 0;
1895         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1896                 runtime->status->hw_ptr % runtime->period_size;
1897         runtime->silence_start = runtime->status->hw_ptr;
1898         runtime->silence_filled = 0;
1899         snd_pcm_stream_unlock_irq(substream);
1900         return 0;
1901 }
1902
1903 static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1904                                snd_pcm_state_t state)
1905 {
1906         struct snd_pcm_runtime *runtime = substream->runtime;
1907         snd_pcm_stream_lock_irq(substream);
1908         runtime->control->appl_ptr = runtime->status->hw_ptr;
1909         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1910             runtime->silence_size > 0)
1911                 snd_pcm_playback_silence(substream, ULONG_MAX);
1912         snd_pcm_stream_unlock_irq(substream);
1913 }
1914
1915 static const struct action_ops snd_pcm_action_reset = {
1916         .pre_action = snd_pcm_pre_reset,
1917         .do_action = snd_pcm_do_reset,
1918         .post_action = snd_pcm_post_reset
1919 };
1920
1921 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1922 {
1923         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1924                                         ACTION_ARG_IGNORE);
1925 }
1926
1927 /*
1928  * prepare ioctl
1929  */
1930 /* pass f_flags as state argument */
1931 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1932                                snd_pcm_state_t state)
1933 {
1934         struct snd_pcm_runtime *runtime = substream->runtime;
1935         int f_flags = (__force int)state;
1936
1937         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1938             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1939                 return -EBADFD;
1940         if (snd_pcm_running(substream))
1941                 return -EBUSY;
1942         substream->f_flags = f_flags;
1943         return 0;
1944 }
1945
1946 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1947                               snd_pcm_state_t state)
1948 {
1949         int err;
1950         snd_pcm_sync_stop(substream, true);
1951         err = substream->ops->prepare(substream);
1952         if (err < 0)
1953                 return err;
1954         return snd_pcm_do_reset(substream, state);
1955 }
1956
1957 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1958                                  snd_pcm_state_t state)
1959 {
1960         struct snd_pcm_runtime *runtime = substream->runtime;
1961         runtime->control->appl_ptr = runtime->status->hw_ptr;
1962         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1963 }
1964
1965 static const struct action_ops snd_pcm_action_prepare = {
1966         .pre_action = snd_pcm_pre_prepare,
1967         .do_action = snd_pcm_do_prepare,
1968         .post_action = snd_pcm_post_prepare
1969 };
1970
1971 /**
1972  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1973  * @substream: the PCM substream instance
1974  * @file: file to refer f_flags
1975  *
1976  * Return: Zero if successful, or a negative error code.
1977  */
1978 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1979                            struct file *file)
1980 {
1981         int f_flags;
1982
1983         if (file)
1984                 f_flags = file->f_flags;
1985         else
1986                 f_flags = substream->f_flags;
1987
1988         snd_pcm_stream_lock_irq(substream);
1989         switch (substream->runtime->state) {
1990         case SNDRV_PCM_STATE_PAUSED:
1991                 snd_pcm_pause(substream, false);
1992                 fallthrough;
1993         case SNDRV_PCM_STATE_SUSPENDED:
1994                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1995                 break;
1996         }
1997         snd_pcm_stream_unlock_irq(substream);
1998
1999         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
2000                                         substream,
2001                                         (__force snd_pcm_state_t)f_flags);
2002 }
2003
2004 /*
2005  * drain ioctl
2006  */
2007
2008 /* drain init callbacks: state argument ignored */
2009 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2010                                   snd_pcm_state_t state)
2011 {
2012         struct snd_pcm_runtime *runtime = substream->runtime;
2013         switch (runtime->state) {
2014         case SNDRV_PCM_STATE_OPEN:
2015         case SNDRV_PCM_STATE_DISCONNECTED:
2016         case SNDRV_PCM_STATE_SUSPENDED:
2017                 return -EBADFD;
2018         }
2019         runtime->trigger_master = substream;
2020         return 0;
2021 }
2022
2023 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2024                                  snd_pcm_state_t state)
2025 {
2026         struct snd_pcm_runtime *runtime = substream->runtime;
2027         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2028                 switch (runtime->state) {
2029                 case SNDRV_PCM_STATE_PREPARED:
2030                         /* start playback stream if possible */
2031                         if (! snd_pcm_playback_empty(substream)) {
2032                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2033                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2034                         } else {
2035                                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2036                         }
2037                         break;
2038                 case SNDRV_PCM_STATE_RUNNING:
2039                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2040                         break;
2041                 case SNDRV_PCM_STATE_XRUN:
2042                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2043                         break;
2044                 default:
2045                         break;
2046                 }
2047         } else {
2048                 /* stop running stream */
2049                 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2050                         snd_pcm_state_t new_state;
2051
2052                         new_state = snd_pcm_capture_avail(runtime) > 0 ?
2053                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2054                         snd_pcm_do_stop(substream, new_state);
2055                         snd_pcm_post_stop(substream, new_state);
2056                 }
2057         }
2058
2059         if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2060             runtime->trigger_master == substream &&
2061             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2062                 return substream->ops->trigger(substream,
2063                                                SNDRV_PCM_TRIGGER_DRAIN);
2064
2065         return 0;
2066 }
2067
2068 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2069                                     snd_pcm_state_t state)
2070 {
2071 }
2072
2073 static const struct action_ops snd_pcm_action_drain_init = {
2074         .pre_action = snd_pcm_pre_drain_init,
2075         .do_action = snd_pcm_do_drain_init,
2076         .post_action = snd_pcm_post_drain_init
2077 };
2078
2079 /*
2080  * Drain the stream(s).
2081  * When the substream is linked, sync until the draining of all playback streams
2082  * is finished.
2083  * After this call, all streams are supposed to be either SETUP or DRAINING
2084  * (capture only) state.
2085  */
2086 static int snd_pcm_drain(struct snd_pcm_substream *substream,
2087                          struct file *file)
2088 {
2089         struct snd_card *card;
2090         struct snd_pcm_runtime *runtime;
2091         struct snd_pcm_substream *s;
2092         struct snd_pcm_group *group;
2093         wait_queue_entry_t wait;
2094         int result = 0;
2095         int nonblock = 0;
2096
2097         card = substream->pcm->card;
2098         runtime = substream->runtime;
2099
2100         if (runtime->state == SNDRV_PCM_STATE_OPEN)
2101                 return -EBADFD;
2102
2103         if (file) {
2104                 if (file->f_flags & O_NONBLOCK)
2105                         nonblock = 1;
2106         } else if (substream->f_flags & O_NONBLOCK)
2107                 nonblock = 1;
2108
2109         snd_pcm_stream_lock_irq(substream);
2110         /* resume pause */
2111         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2112                 snd_pcm_pause(substream, false);
2113
2114         /* pre-start/stop - all running streams are changed to DRAINING state */
2115         result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2116                                 ACTION_ARG_IGNORE);
2117         if (result < 0)
2118                 goto unlock;
2119         /* in non-blocking, we don't wait in ioctl but let caller poll */
2120         if (nonblock) {
2121                 result = -EAGAIN;
2122                 goto unlock;
2123         }
2124
2125         for (;;) {
2126                 long tout;
2127                 struct snd_pcm_runtime *to_check;
2128                 if (signal_pending(current)) {
2129                         result = -ERESTARTSYS;
2130                         break;
2131                 }
2132                 /* find a substream to drain */
2133                 to_check = NULL;
2134                 group = snd_pcm_stream_group_ref(substream);
2135                 snd_pcm_group_for_each_entry(s, substream) {
2136                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2137                                 continue;
2138                         runtime = s->runtime;
2139                         if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2140                                 to_check = runtime;
2141                                 break;
2142                         }
2143                 }
2144                 snd_pcm_group_unref(group, substream);
2145                 if (!to_check)
2146                         break; /* all drained */
2147                 init_waitqueue_entry(&wait, current);
2148                 set_current_state(TASK_INTERRUPTIBLE);
2149                 add_wait_queue(&to_check->sleep, &wait);
2150                 snd_pcm_stream_unlock_irq(substream);
2151                 if (runtime->no_period_wakeup)
2152                         tout = MAX_SCHEDULE_TIMEOUT;
2153                 else {
2154                         tout = 10;
2155                         if (runtime->rate) {
2156                                 long t = runtime->period_size * 2 / runtime->rate;
2157                                 tout = max(t, tout);
2158                         }
2159                         tout = msecs_to_jiffies(tout * 1000);
2160                 }
2161                 tout = schedule_timeout(tout);
2162
2163                 snd_pcm_stream_lock_irq(substream);
2164                 group = snd_pcm_stream_group_ref(substream);
2165                 snd_pcm_group_for_each_entry(s, substream) {
2166                         if (s->runtime == to_check) {
2167                                 remove_wait_queue(&to_check->sleep, &wait);
2168                                 break;
2169                         }
2170                 }
2171                 snd_pcm_group_unref(group, substream);
2172
2173                 if (card->shutdown) {
2174                         result = -ENODEV;
2175                         break;
2176                 }
2177                 if (tout == 0) {
2178                         if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2179                                 result = -ESTRPIPE;
2180                         else {
2181                                 dev_dbg(substream->pcm->card->dev,
2182                                         "playback drain error (DMA or IRQ trouble?)\n");
2183                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2184                                 result = -EIO;
2185                         }
2186                         break;
2187                 }
2188         }
2189
2190  unlock:
2191         snd_pcm_stream_unlock_irq(substream);
2192
2193         return result;
2194 }
2195
2196 /*
2197  * drop ioctl
2198  *
2199  * Immediately put all linked substreams into SETUP state.
2200  */
2201 static int snd_pcm_drop(struct snd_pcm_substream *substream)
2202 {
2203         struct snd_pcm_runtime *runtime;
2204         int result = 0;
2205
2206         if (PCM_RUNTIME_CHECK(substream))
2207                 return -ENXIO;
2208         runtime = substream->runtime;
2209
2210         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2211             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2212                 return -EBADFD;
2213
2214         snd_pcm_stream_lock_irq(substream);
2215         /* resume pause */
2216         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2217                 snd_pcm_pause(substream, false);
2218
2219         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2220         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2221         snd_pcm_stream_unlock_irq(substream);
2222
2223         return result;
2224 }
2225
2226
2227 static bool is_pcm_file(struct file *file)
2228 {
2229         struct inode *inode = file_inode(file);
2230         struct snd_pcm *pcm;
2231         unsigned int minor;
2232
2233         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2234                 return false;
2235         minor = iminor(inode);
2236         pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2237         if (!pcm)
2238                 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2239         if (!pcm)
2240                 return false;
2241         snd_card_unref(pcm->card);
2242         return true;
2243 }
2244
2245 /*
2246  * PCM link handling
2247  */
2248 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2249 {
2250         int res = 0;
2251         struct snd_pcm_file *pcm_file;
2252         struct snd_pcm_substream *substream1;
2253         struct snd_pcm_group *group, *target_group;
2254         bool nonatomic = substream->pcm->nonatomic;
2255         struct fd f = fdget(fd);
2256
2257         if (!f.file)
2258                 return -EBADFD;
2259         if (!is_pcm_file(f.file)) {
2260                 res = -EBADFD;
2261                 goto _badf;
2262         }
2263         pcm_file = f.file->private_data;
2264         substream1 = pcm_file->substream;
2265
2266         if (substream == substream1) {
2267                 res = -EINVAL;
2268                 goto _badf;
2269         }
2270
2271         group = kzalloc(sizeof(*group), GFP_KERNEL);
2272         if (!group) {
2273                 res = -ENOMEM;
2274                 goto _nolock;
2275         }
2276         snd_pcm_group_init(group);
2277
2278         down_write(&snd_pcm_link_rwsem);
2279         if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2280             substream->runtime->state != substream1->runtime->state ||
2281             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2282                 res = -EBADFD;
2283                 goto _end;
2284         }
2285         if (snd_pcm_stream_linked(substream1)) {
2286                 res = -EALREADY;
2287                 goto _end;
2288         }
2289
2290         snd_pcm_stream_lock_irq(substream);
2291         if (!snd_pcm_stream_linked(substream)) {
2292                 snd_pcm_group_assign(substream, group);
2293                 group = NULL; /* assigned, don't free this one below */
2294         }
2295         target_group = substream->group;
2296         snd_pcm_stream_unlock_irq(substream);
2297
2298         snd_pcm_group_lock_irq(target_group, nonatomic);
2299         snd_pcm_stream_lock_nested(substream1);
2300         snd_pcm_group_assign(substream1, target_group);
2301         refcount_inc(&target_group->refs);
2302         snd_pcm_stream_unlock(substream1);
2303         snd_pcm_group_unlock_irq(target_group, nonatomic);
2304  _end:
2305         up_write(&snd_pcm_link_rwsem);
2306  _nolock:
2307         kfree(group);
2308  _badf:
2309         fdput(f);
2310         return res;
2311 }
2312
2313 static void relink_to_local(struct snd_pcm_substream *substream)
2314 {
2315         snd_pcm_stream_lock_nested(substream);
2316         snd_pcm_group_assign(substream, &substream->self_group);
2317         snd_pcm_stream_unlock(substream);
2318 }
2319
2320 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2321 {
2322         struct snd_pcm_group *group;
2323         bool nonatomic = substream->pcm->nonatomic;
2324         bool do_free = false;
2325         int res = 0;
2326
2327         down_write(&snd_pcm_link_rwsem);
2328
2329         if (!snd_pcm_stream_linked(substream)) {
2330                 res = -EALREADY;
2331                 goto _end;
2332         }
2333
2334         group = substream->group;
2335         snd_pcm_group_lock_irq(group, nonatomic);
2336
2337         relink_to_local(substream);
2338         refcount_dec(&group->refs);
2339
2340         /* detach the last stream, too */
2341         if (list_is_singular(&group->substreams)) {
2342                 relink_to_local(list_first_entry(&group->substreams,
2343                                                  struct snd_pcm_substream,
2344                                                  link_list));
2345                 do_free = refcount_dec_and_test(&group->refs);
2346         }
2347
2348         snd_pcm_group_unlock_irq(group, nonatomic);
2349         if (do_free)
2350                 kfree(group);
2351
2352        _end:
2353         up_write(&snd_pcm_link_rwsem);
2354         return res;
2355 }
2356
2357 /*
2358  * hw configurator
2359  */
2360 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2361                                struct snd_pcm_hw_rule *rule)
2362 {
2363         struct snd_interval t;
2364         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2365                      hw_param_interval_c(params, rule->deps[1]), &t);
2366         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2367 }
2368
2369 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2370                                struct snd_pcm_hw_rule *rule)
2371 {
2372         struct snd_interval t;
2373         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2374                      hw_param_interval_c(params, rule->deps[1]), &t);
2375         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2376 }
2377
2378 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2379                                    struct snd_pcm_hw_rule *rule)
2380 {
2381         struct snd_interval t;
2382         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2383                          hw_param_interval_c(params, rule->deps[1]),
2384                          (unsigned long) rule->private, &t);
2385         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2386 }
2387
2388 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2389                                    struct snd_pcm_hw_rule *rule)
2390 {
2391         struct snd_interval t;
2392         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2393                          (unsigned long) rule->private,
2394                          hw_param_interval_c(params, rule->deps[1]), &t);
2395         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2396 }
2397
2398 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2399                                   struct snd_pcm_hw_rule *rule)
2400 {
2401         snd_pcm_format_t k;
2402         const struct snd_interval *i =
2403                                 hw_param_interval_c(params, rule->deps[0]);
2404         struct snd_mask m;
2405         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2406         snd_mask_any(&m);
2407         pcm_for_each_format(k) {
2408                 int bits;
2409                 if (!snd_mask_test_format(mask, k))
2410                         continue;
2411                 bits = snd_pcm_format_physical_width(k);
2412                 if (bits <= 0)
2413                         continue; /* ignore invalid formats */
2414                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2415                         snd_mask_reset(&m, (__force unsigned)k);
2416         }
2417         return snd_mask_refine(mask, &m);
2418 }
2419
2420 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2421                                        struct snd_pcm_hw_rule *rule)
2422 {
2423         struct snd_interval t;
2424         snd_pcm_format_t k;
2425
2426         t.min = UINT_MAX;
2427         t.max = 0;
2428         t.openmin = 0;
2429         t.openmax = 0;
2430         pcm_for_each_format(k) {
2431                 int bits;
2432                 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2433                         continue;
2434                 bits = snd_pcm_format_physical_width(k);
2435                 if (bits <= 0)
2436                         continue; /* ignore invalid formats */
2437                 if (t.min > (unsigned)bits)
2438                         t.min = bits;
2439                 if (t.max < (unsigned)bits)
2440                         t.max = bits;
2441         }
2442         t.integer = 1;
2443         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2444 }
2445
2446 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2447 #error "Change this table"
2448 #endif
2449
2450 static const unsigned int rates[] = {
2451         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2452         48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2453 };
2454
2455 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2456         .count = ARRAY_SIZE(rates),
2457         .list = rates,
2458 };
2459
2460 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2461                                 struct snd_pcm_hw_rule *rule)
2462 {
2463         struct snd_pcm_hardware *hw = rule->private;
2464         return snd_interval_list(hw_param_interval(params, rule->var),
2465                                  snd_pcm_known_rates.count,
2466                                  snd_pcm_known_rates.list, hw->rates);
2467 }
2468
2469 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2470                                             struct snd_pcm_hw_rule *rule)
2471 {
2472         struct snd_interval t;
2473         struct snd_pcm_substream *substream = rule->private;
2474         t.min = 0;
2475         t.max = substream->buffer_bytes_max;
2476         t.openmin = 0;
2477         t.openmax = 0;
2478         t.integer = 1;
2479         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2480 }
2481
2482 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2483 {
2484         struct snd_pcm_runtime *runtime = substream->runtime;
2485         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2486         int k, err;
2487
2488         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2489                 snd_mask_any(constrs_mask(constrs, k));
2490         }
2491
2492         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2493                 snd_interval_any(constrs_interval(constrs, k));
2494         }
2495
2496         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2497         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2498         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2499         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2500         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2501
2502         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2503                                    snd_pcm_hw_rule_format, NULL,
2504                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2505         if (err < 0)
2506                 return err;
2507         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2508                                   snd_pcm_hw_rule_sample_bits, NULL,
2509                                   SNDRV_PCM_HW_PARAM_FORMAT,
2510                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2511         if (err < 0)
2512                 return err;
2513         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2514                                   snd_pcm_hw_rule_div, NULL,
2515                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2516         if (err < 0)
2517                 return err;
2518         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2519                                   snd_pcm_hw_rule_mul, NULL,
2520                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2521         if (err < 0)
2522                 return err;
2523         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2524                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2525                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2526         if (err < 0)
2527                 return err;
2528         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2529                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2530                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2531         if (err < 0)
2532                 return err;
2533         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2534                                   snd_pcm_hw_rule_div, NULL,
2535                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2536         if (err < 0)
2537                 return err;
2538         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2539                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2540                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2541         if (err < 0)
2542                 return err;
2543         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2544                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2545                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2546         if (err < 0)
2547                 return err;
2548         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2549                                   snd_pcm_hw_rule_div, NULL,
2550                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2551         if (err < 0)
2552                 return err;
2553         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2554                                   snd_pcm_hw_rule_div, NULL,
2555                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2556         if (err < 0)
2557                 return err;
2558         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2559                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2560                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2561         if (err < 0)
2562                 return err;
2563         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2564                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2565                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2566         if (err < 0)
2567                 return err;
2568         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2569                                   snd_pcm_hw_rule_mul, NULL,
2570                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2571         if (err < 0)
2572                 return err;
2573         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2574                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2575                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2576         if (err < 0)
2577                 return err;
2578         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2579                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2580                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2581         if (err < 0)
2582                 return err;
2583         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2584                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2585                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2586         if (err < 0)
2587                 return err;
2588         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2589                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2590                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2591         if (err < 0)
2592                 return err;
2593         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2594                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2595                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2596         if (err < 0)
2597                 return err;
2598         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2599                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2600                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2601         if (err < 0)
2602                 return err;
2603         return 0;
2604 }
2605
2606 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2607 {
2608         struct snd_pcm_runtime *runtime = substream->runtime;
2609         struct snd_pcm_hardware *hw = &runtime->hw;
2610         int err;
2611         unsigned int mask = 0;
2612
2613         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2614                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2615         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2616                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2617         if (hw_support_mmap(substream)) {
2618                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2619                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2620                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2621                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2622                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2623                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2624         }
2625         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2626         if (err < 0)
2627                 return err;
2628
2629         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2630         if (err < 0)
2631                 return err;
2632
2633         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2634                                          PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2635         if (err < 0)
2636                 return err;
2637
2638         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2639                                            hw->channels_min, hw->channels_max);
2640         if (err < 0)
2641                 return err;
2642
2643         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2644                                            hw->rate_min, hw->rate_max);
2645         if (err < 0)
2646                 return err;
2647
2648         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2649                                            hw->period_bytes_min, hw->period_bytes_max);
2650         if (err < 0)
2651                 return err;
2652
2653         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2654                                            hw->periods_min, hw->periods_max);
2655         if (err < 0)
2656                 return err;
2657
2658         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2659                                            hw->period_bytes_min, hw->buffer_bytes_max);
2660         if (err < 0)
2661                 return err;
2662
2663         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2664                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2665                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2666         if (err < 0)
2667                 return err;
2668
2669         /* FIXME: remove */
2670         if (runtime->dma_bytes) {
2671                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2672                 if (err < 0)
2673                         return err;
2674         }
2675
2676         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2677                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2678                                           snd_pcm_hw_rule_rate, hw,
2679                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2680                 if (err < 0)
2681                         return err;
2682         }
2683
2684         /* FIXME: this belong to lowlevel */
2685         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2686
2687         return 0;
2688 }
2689
2690 static void pcm_release_private(struct snd_pcm_substream *substream)
2691 {
2692         if (snd_pcm_stream_linked(substream))
2693                 snd_pcm_unlink(substream);
2694 }
2695
2696 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2697 {
2698         substream->ref_count--;
2699         if (substream->ref_count > 0)
2700                 return;
2701
2702         snd_pcm_drop(substream);
2703         if (substream->hw_opened) {
2704                 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2705                         do_hw_free(substream);
2706                 substream->ops->close(substream);
2707                 substream->hw_opened = 0;
2708         }
2709         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2710                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2711         if (substream->pcm_release) {
2712                 substream->pcm_release(substream);
2713                 substream->pcm_release = NULL;
2714         }
2715         snd_pcm_detach_substream(substream);
2716 }
2717 EXPORT_SYMBOL(snd_pcm_release_substream);
2718
2719 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2720                            struct file *file,
2721                            struct snd_pcm_substream **rsubstream)
2722 {
2723         struct snd_pcm_substream *substream;
2724         int err;
2725
2726         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2727         if (err < 0)
2728                 return err;
2729         if (substream->ref_count > 1) {
2730                 *rsubstream = substream;
2731                 return 0;
2732         }
2733
2734         err = snd_pcm_hw_constraints_init(substream);
2735         if (err < 0) {
2736                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2737                 goto error;
2738         }
2739
2740         err = substream->ops->open(substream);
2741         if (err < 0)
2742                 goto error;
2743
2744         substream->hw_opened = 1;
2745
2746         err = snd_pcm_hw_constraints_complete(substream);
2747         if (err < 0) {
2748                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2749                 goto error;
2750         }
2751
2752         /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2753          * the DMA buffer requires it
2754          */
2755         if (substream->managed_buffer_alloc &&
2756             substream->dma_buffer.dev.need_sync)
2757                 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2758
2759         *rsubstream = substream;
2760         return 0;
2761
2762  error:
2763         snd_pcm_release_substream(substream);
2764         return err;
2765 }
2766 EXPORT_SYMBOL(snd_pcm_open_substream);
2767
2768 static int snd_pcm_open_file(struct file *file,
2769                              struct snd_pcm *pcm,
2770                              int stream)
2771 {
2772         struct snd_pcm_file *pcm_file;
2773         struct snd_pcm_substream *substream;
2774         int err;
2775
2776         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2777         if (err < 0)
2778                 return err;
2779
2780         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2781         if (pcm_file == NULL) {
2782                 snd_pcm_release_substream(substream);
2783                 return -ENOMEM;
2784         }
2785         pcm_file->substream = substream;
2786         if (substream->ref_count == 1)
2787                 substream->pcm_release = pcm_release_private;
2788         file->private_data = pcm_file;
2789
2790         return 0;
2791 }
2792
2793 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2794 {
2795         struct snd_pcm *pcm;
2796         int err = nonseekable_open(inode, file);
2797         if (err < 0)
2798                 return err;
2799         pcm = snd_lookup_minor_data(iminor(inode),
2800                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2801         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2802         if (pcm)
2803                 snd_card_unref(pcm->card);
2804         return err;
2805 }
2806
2807 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2808 {
2809         struct snd_pcm *pcm;
2810         int err = nonseekable_open(inode, file);
2811         if (err < 0)
2812                 return err;
2813         pcm = snd_lookup_minor_data(iminor(inode),
2814                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2815         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2816         if (pcm)
2817                 snd_card_unref(pcm->card);
2818         return err;
2819 }
2820
2821 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2822 {
2823         int err;
2824         wait_queue_entry_t wait;
2825
2826         if (pcm == NULL) {
2827                 err = -ENODEV;
2828                 goto __error1;
2829         }
2830         err = snd_card_file_add(pcm->card, file);
2831         if (err < 0)
2832                 goto __error1;
2833         if (!try_module_get(pcm->card->module)) {
2834                 err = -EFAULT;
2835                 goto __error2;
2836         }
2837         init_waitqueue_entry(&wait, current);
2838         add_wait_queue(&pcm->open_wait, &wait);
2839         mutex_lock(&pcm->open_mutex);
2840         while (1) {
2841                 err = snd_pcm_open_file(file, pcm, stream);
2842                 if (err >= 0)
2843                         break;
2844                 if (err == -EAGAIN) {
2845                         if (file->f_flags & O_NONBLOCK) {
2846                                 err = -EBUSY;
2847                                 break;
2848                         }
2849                 } else
2850                         break;
2851                 set_current_state(TASK_INTERRUPTIBLE);
2852                 mutex_unlock(&pcm->open_mutex);
2853                 schedule();
2854                 mutex_lock(&pcm->open_mutex);
2855                 if (pcm->card->shutdown) {
2856                         err = -ENODEV;
2857                         break;
2858                 }
2859                 if (signal_pending(current)) {
2860                         err = -ERESTARTSYS;
2861                         break;
2862                 }
2863         }
2864         remove_wait_queue(&pcm->open_wait, &wait);
2865         mutex_unlock(&pcm->open_mutex);
2866         if (err < 0)
2867                 goto __error;
2868         return err;
2869
2870       __error:
2871         module_put(pcm->card->module);
2872       __error2:
2873         snd_card_file_remove(pcm->card, file);
2874       __error1:
2875         return err;
2876 }
2877
2878 static int snd_pcm_release(struct inode *inode, struct file *file)
2879 {
2880         struct snd_pcm *pcm;
2881         struct snd_pcm_substream *substream;
2882         struct snd_pcm_file *pcm_file;
2883
2884         pcm_file = file->private_data;
2885         substream = pcm_file->substream;
2886         if (snd_BUG_ON(!substream))
2887                 return -ENXIO;
2888         pcm = substream->pcm;
2889
2890         /* block until the device gets woken up as it may touch the hardware */
2891         snd_power_wait(pcm->card);
2892
2893         mutex_lock(&pcm->open_mutex);
2894         snd_pcm_release_substream(substream);
2895         kfree(pcm_file);
2896         mutex_unlock(&pcm->open_mutex);
2897         wake_up(&pcm->open_wait);
2898         module_put(pcm->card->module);
2899         snd_card_file_remove(pcm->card, file);
2900         return 0;
2901 }
2902
2903 /* check and update PCM state; return 0 or a negative error
2904  * call this inside PCM lock
2905  */
2906 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2907 {
2908         switch (substream->runtime->state) {
2909         case SNDRV_PCM_STATE_DRAINING:
2910                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2911                         return -EBADFD;
2912                 fallthrough;
2913         case SNDRV_PCM_STATE_RUNNING:
2914                 return snd_pcm_update_hw_ptr(substream);
2915         case SNDRV_PCM_STATE_PREPARED:
2916         case SNDRV_PCM_STATE_PAUSED:
2917                 return 0;
2918         case SNDRV_PCM_STATE_SUSPENDED:
2919                 return -ESTRPIPE;
2920         case SNDRV_PCM_STATE_XRUN:
2921                 return -EPIPE;
2922         default:
2923                 return -EBADFD;
2924         }
2925 }
2926
2927 /* increase the appl_ptr; returns the processed frames or a negative error */
2928 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2929                                           snd_pcm_uframes_t frames,
2930                                            snd_pcm_sframes_t avail)
2931 {
2932         struct snd_pcm_runtime *runtime = substream->runtime;
2933         snd_pcm_sframes_t appl_ptr;
2934         int ret;
2935
2936         if (avail <= 0)
2937                 return 0;
2938         if (frames > (snd_pcm_uframes_t)avail)
2939                 frames = avail;
2940         appl_ptr = runtime->control->appl_ptr + frames;
2941         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2942                 appl_ptr -= runtime->boundary;
2943         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2944         return ret < 0 ? ret : frames;
2945 }
2946
2947 /* decrease the appl_ptr; returns the processed frames or zero for error */
2948 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2949                                          snd_pcm_uframes_t frames,
2950                                          snd_pcm_sframes_t avail)
2951 {
2952         struct snd_pcm_runtime *runtime = substream->runtime;
2953         snd_pcm_sframes_t appl_ptr;
2954         int ret;
2955
2956         if (avail <= 0)
2957                 return 0;
2958         if (frames > (snd_pcm_uframes_t)avail)
2959                 frames = avail;
2960         appl_ptr = runtime->control->appl_ptr - frames;
2961         if (appl_ptr < 0)
2962                 appl_ptr += runtime->boundary;
2963         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2964         /* NOTE: we return zero for errors because PulseAudio gets depressed
2965          * upon receiving an error from rewind ioctl and stops processing
2966          * any longer.  Returning zero means that no rewind is done, so
2967          * it's not absolutely wrong to answer like that.
2968          */
2969         return ret < 0 ? 0 : frames;
2970 }
2971
2972 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2973                                         snd_pcm_uframes_t frames)
2974 {
2975         snd_pcm_sframes_t ret;
2976
2977         if (frames == 0)
2978                 return 0;
2979
2980         snd_pcm_stream_lock_irq(substream);
2981         ret = do_pcm_hwsync(substream);
2982         if (!ret)
2983                 ret = rewind_appl_ptr(substream, frames,
2984                                       snd_pcm_hw_avail(substream));
2985         snd_pcm_stream_unlock_irq(substream);
2986         if (ret >= 0)
2987                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2988         return ret;
2989 }
2990
2991 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2992                                          snd_pcm_uframes_t frames)
2993 {
2994         snd_pcm_sframes_t ret;
2995
2996         if (frames == 0)
2997                 return 0;
2998
2999         snd_pcm_stream_lock_irq(substream);
3000         ret = do_pcm_hwsync(substream);
3001         if (!ret)
3002                 ret = forward_appl_ptr(substream, frames,
3003                                        snd_pcm_avail(substream));
3004         snd_pcm_stream_unlock_irq(substream);
3005         if (ret >= 0)
3006                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3007         return ret;
3008 }
3009
3010 static int snd_pcm_delay(struct snd_pcm_substream *substream,
3011                          snd_pcm_sframes_t *delay)
3012 {
3013         int err;
3014
3015         snd_pcm_stream_lock_irq(substream);
3016         err = do_pcm_hwsync(substream);
3017         if (delay && !err)
3018                 *delay = snd_pcm_calc_delay(substream);
3019         snd_pcm_stream_unlock_irq(substream);
3020         snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3021
3022         return err;
3023 }
3024
3025 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3026 {
3027         return snd_pcm_delay(substream, NULL);
3028 }
3029
3030 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3031                             struct snd_pcm_sync_ptr __user *_sync_ptr)
3032 {
3033         struct snd_pcm_runtime *runtime = substream->runtime;
3034         struct snd_pcm_sync_ptr sync_ptr;
3035         volatile struct snd_pcm_mmap_status *status;
3036         volatile struct snd_pcm_mmap_control *control;
3037         int err;
3038
3039         memset(&sync_ptr, 0, sizeof(sync_ptr));
3040         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3041                 return -EFAULT;
3042         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3043                 return -EFAULT;
3044         status = runtime->status;
3045         control = runtime->control;
3046         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3047                 err = snd_pcm_hwsync(substream);
3048                 if (err < 0)
3049                         return err;
3050         }
3051         snd_pcm_stream_lock_irq(substream);
3052         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3053                 err = pcm_lib_apply_appl_ptr(substream,
3054                                              sync_ptr.c.control.appl_ptr);
3055                 if (err < 0) {
3056                         snd_pcm_stream_unlock_irq(substream);
3057                         return err;
3058                 }
3059         } else {
3060                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3061         }
3062         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3063                 control->avail_min = sync_ptr.c.control.avail_min;
3064         else
3065                 sync_ptr.c.control.avail_min = control->avail_min;
3066         sync_ptr.s.status.state = status->state;
3067         sync_ptr.s.status.hw_ptr = status->hw_ptr;
3068         sync_ptr.s.status.tstamp = status->tstamp;
3069         sync_ptr.s.status.suspended_state = status->suspended_state;
3070         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3071         snd_pcm_stream_unlock_irq(substream);
3072         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3073                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3074         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3075                 return -EFAULT;
3076         return 0;
3077 }
3078
3079 struct snd_pcm_mmap_status32 {
3080         snd_pcm_state_t state;
3081         s32 pad1;
3082         u32 hw_ptr;
3083         s32 tstamp_sec;
3084         s32 tstamp_nsec;
3085         snd_pcm_state_t suspended_state;
3086         s32 audio_tstamp_sec;
3087         s32 audio_tstamp_nsec;
3088 } __attribute__((packed));
3089
3090 struct snd_pcm_mmap_control32 {
3091         u32 appl_ptr;
3092         u32 avail_min;
3093 };
3094
3095 struct snd_pcm_sync_ptr32 {
3096         u32 flags;
3097         union {
3098                 struct snd_pcm_mmap_status32 status;
3099                 unsigned char reserved[64];
3100         } s;
3101         union {
3102                 struct snd_pcm_mmap_control32 control;
3103                 unsigned char reserved[64];
3104         } c;
3105 } __attribute__((packed));
3106
3107 /* recalcuate the boundary within 32bit */
3108 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3109 {
3110         snd_pcm_uframes_t boundary;
3111
3112         if (! runtime->buffer_size)
3113                 return 0;
3114         boundary = runtime->buffer_size;
3115         while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3116                 boundary *= 2;
3117         return boundary;
3118 }
3119
3120 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3121                                          struct snd_pcm_sync_ptr32 __user *src)
3122 {
3123         struct snd_pcm_runtime *runtime = substream->runtime;
3124         volatile struct snd_pcm_mmap_status *status;
3125         volatile struct snd_pcm_mmap_control *control;
3126         u32 sflags;
3127         struct snd_pcm_mmap_control scontrol;
3128         struct snd_pcm_mmap_status sstatus;
3129         snd_pcm_uframes_t boundary;
3130         int err;
3131
3132         if (snd_BUG_ON(!runtime))
3133                 return -EINVAL;
3134
3135         if (get_user(sflags, &src->flags) ||
3136             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3137             get_user(scontrol.avail_min, &src->c.control.avail_min))
3138                 return -EFAULT;
3139         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3140                 err = snd_pcm_hwsync(substream);
3141                 if (err < 0)
3142                         return err;
3143         }
3144         status = runtime->status;
3145         control = runtime->control;
3146         boundary = recalculate_boundary(runtime);
3147         if (! boundary)
3148                 boundary = 0x7fffffff;
3149         snd_pcm_stream_lock_irq(substream);
3150         /* FIXME: we should consider the boundary for the sync from app */
3151         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3152                 err = pcm_lib_apply_appl_ptr(substream,
3153                                 scontrol.appl_ptr);
3154                 if (err < 0) {
3155                         snd_pcm_stream_unlock_irq(substream);
3156                         return err;
3157                 }
3158         } else
3159                 scontrol.appl_ptr = control->appl_ptr % boundary;
3160         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3161                 control->avail_min = scontrol.avail_min;
3162         else
3163                 scontrol.avail_min = control->avail_min;
3164         sstatus.state = status->state;
3165         sstatus.hw_ptr = status->hw_ptr % boundary;
3166         sstatus.tstamp = status->tstamp;
3167         sstatus.suspended_state = status->suspended_state;
3168         sstatus.audio_tstamp = status->audio_tstamp;
3169         snd_pcm_stream_unlock_irq(substream);
3170         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3171                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3172         if (put_user(sstatus.state, &src->s.status.state) ||
3173             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3174             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3175             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3176             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3177             put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3178             put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3179             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3180             put_user(scontrol.avail_min, &src->c.control.avail_min))
3181                 return -EFAULT;
3182
3183         return 0;
3184 }
3185 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3186
3187 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3188 {
3189         struct snd_pcm_runtime *runtime = substream->runtime;
3190         int arg;
3191
3192         if (get_user(arg, _arg))
3193                 return -EFAULT;
3194         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3195                 return -EINVAL;
3196         runtime->tstamp_type = arg;
3197         return 0;
3198 }
3199
3200 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3201                                       struct snd_xferi __user *_xferi)
3202 {
3203         struct snd_xferi xferi;
3204         struct snd_pcm_runtime *runtime = substream->runtime;
3205         snd_pcm_sframes_t result;
3206
3207         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3208                 return -EBADFD;
3209         if (put_user(0, &_xferi->result))
3210                 return -EFAULT;
3211         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3212                 return -EFAULT;
3213         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3214                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3215         else
3216                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3217         if (put_user(result, &_xferi->result))
3218                 return -EFAULT;
3219         return result < 0 ? result : 0;
3220 }
3221
3222 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3223                                       struct snd_xfern __user *_xfern)
3224 {
3225         struct snd_xfern xfern;
3226         struct snd_pcm_runtime *runtime = substream->runtime;
3227         void *bufs;
3228         snd_pcm_sframes_t result;
3229
3230         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3231                 return -EBADFD;
3232         if (runtime->channels > 128)
3233                 return -EINVAL;
3234         if (put_user(0, &_xfern->result))
3235                 return -EFAULT;
3236         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3237                 return -EFAULT;
3238
3239         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3240         if (IS_ERR(bufs))
3241                 return PTR_ERR(bufs);
3242         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3243                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3244         else
3245                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3246         kfree(bufs);
3247         if (put_user(result, &_xfern->result))
3248                 return -EFAULT;
3249         return result < 0 ? result : 0;
3250 }
3251
3252 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3253                                 snd_pcm_uframes_t __user *_frames)
3254 {
3255         snd_pcm_uframes_t frames;
3256         snd_pcm_sframes_t result;
3257
3258         if (get_user(frames, _frames))
3259                 return -EFAULT;
3260         if (put_user(0, _frames))
3261                 return -EFAULT;
3262         result = snd_pcm_rewind(substream, frames);
3263         if (put_user(result, _frames))
3264                 return -EFAULT;
3265         return result < 0 ? result : 0;
3266 }
3267
3268 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3269                                  snd_pcm_uframes_t __user *_frames)
3270 {
3271         snd_pcm_uframes_t frames;
3272         snd_pcm_sframes_t result;
3273
3274         if (get_user(frames, _frames))
3275                 return -EFAULT;
3276         if (put_user(0, _frames))
3277                 return -EFAULT;
3278         result = snd_pcm_forward(substream, frames);
3279         if (put_user(result, _frames))
3280                 return -EFAULT;
3281         return result < 0 ? result : 0;
3282 }
3283
3284 static int snd_pcm_common_ioctl(struct file *file,
3285                                  struct snd_pcm_substream *substream,
3286                                  unsigned int cmd, void __user *arg)
3287 {
3288         struct snd_pcm_file *pcm_file = file->private_data;
3289         int res;
3290
3291         if (PCM_RUNTIME_CHECK(substream))
3292                 return -ENXIO;
3293
3294         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3295                 return -EBADFD;
3296
3297         res = snd_power_wait(substream->pcm->card);
3298         if (res < 0)
3299                 return res;
3300
3301         switch (cmd) {
3302         case SNDRV_PCM_IOCTL_PVERSION:
3303                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3304         case SNDRV_PCM_IOCTL_INFO:
3305                 return snd_pcm_info_user(substream, arg);
3306         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
3307                 return 0;
3308         case SNDRV_PCM_IOCTL_TTSTAMP:
3309                 return snd_pcm_tstamp(substream, arg);
3310         case SNDRV_PCM_IOCTL_USER_PVERSION:
3311                 if (get_user(pcm_file->user_pversion,
3312                              (unsigned int __user *)arg))
3313                         return -EFAULT;
3314                 return 0;
3315         case SNDRV_PCM_IOCTL_HW_REFINE:
3316                 return snd_pcm_hw_refine_user(substream, arg);
3317         case SNDRV_PCM_IOCTL_HW_PARAMS:
3318                 return snd_pcm_hw_params_user(substream, arg);
3319         case SNDRV_PCM_IOCTL_HW_FREE:
3320                 return snd_pcm_hw_free(substream);
3321         case SNDRV_PCM_IOCTL_SW_PARAMS:
3322                 return snd_pcm_sw_params_user(substream, arg);
3323         case SNDRV_PCM_IOCTL_STATUS32:
3324                 return snd_pcm_status_user32(substream, arg, false);
3325         case SNDRV_PCM_IOCTL_STATUS_EXT32:
3326                 return snd_pcm_status_user32(substream, arg, true);
3327         case SNDRV_PCM_IOCTL_STATUS64:
3328                 return snd_pcm_status_user64(substream, arg, false);
3329         case SNDRV_PCM_IOCTL_STATUS_EXT64:
3330                 return snd_pcm_status_user64(substream, arg, true);
3331         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3332                 return snd_pcm_channel_info_user(substream, arg);
3333         case SNDRV_PCM_IOCTL_PREPARE:
3334                 return snd_pcm_prepare(substream, file);
3335         case SNDRV_PCM_IOCTL_RESET:
3336                 return snd_pcm_reset(substream);
3337         case SNDRV_PCM_IOCTL_START:
3338                 return snd_pcm_start_lock_irq(substream);
3339         case SNDRV_PCM_IOCTL_LINK:
3340                 return snd_pcm_link(substream, (int)(unsigned long) arg);
3341         case SNDRV_PCM_IOCTL_UNLINK:
3342                 return snd_pcm_unlink(substream);
3343         case SNDRV_PCM_IOCTL_RESUME:
3344                 return snd_pcm_resume(substream);
3345         case SNDRV_PCM_IOCTL_XRUN:
3346                 return snd_pcm_xrun(substream);
3347         case SNDRV_PCM_IOCTL_HWSYNC:
3348                 return snd_pcm_hwsync(substream);
3349         case SNDRV_PCM_IOCTL_DELAY:
3350         {
3351                 snd_pcm_sframes_t delay = 0;
3352                 snd_pcm_sframes_t __user *res = arg;
3353                 int err;
3354
3355                 err = snd_pcm_delay(substream, &delay);
3356                 if (err)
3357                         return err;
3358                 if (put_user(delay, res))
3359                         return -EFAULT;
3360                 return 0;
3361         }
3362         case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3363                 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3364         case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3365                 return snd_pcm_sync_ptr(substream, arg);
3366 #ifdef CONFIG_SND_SUPPORT_OLD_API
3367         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3368                 return snd_pcm_hw_refine_old_user(substream, arg);
3369         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3370                 return snd_pcm_hw_params_old_user(substream, arg);
3371 #endif
3372         case SNDRV_PCM_IOCTL_DRAIN:
3373                 return snd_pcm_drain(substream, file);
3374         case SNDRV_PCM_IOCTL_DROP:
3375                 return snd_pcm_drop(substream);
3376         case SNDRV_PCM_IOCTL_PAUSE:
3377                 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3378         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3379         case SNDRV_PCM_IOCTL_READI_FRAMES:
3380                 return snd_pcm_xferi_frames_ioctl(substream, arg);
3381         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3382         case SNDRV_PCM_IOCTL_READN_FRAMES:
3383                 return snd_pcm_xfern_frames_ioctl(substream, arg);
3384         case SNDRV_PCM_IOCTL_REWIND:
3385                 return snd_pcm_rewind_ioctl(substream, arg);
3386         case SNDRV_PCM_IOCTL_FORWARD:
3387                 return snd_pcm_forward_ioctl(substream, arg);
3388         }
3389         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3390         return -ENOTTY;
3391 }
3392
3393 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3394                           unsigned long arg)
3395 {
3396         struct snd_pcm_file *pcm_file;
3397
3398         pcm_file = file->private_data;
3399
3400         if (((cmd >> 8) & 0xff) != 'A')
3401                 return -ENOTTY;
3402
3403         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3404                                      (void __user *)arg);
3405 }
3406
3407 /**
3408  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3409  * @substream: PCM substream
3410  * @cmd: IOCTL cmd
3411  * @arg: IOCTL argument
3412  *
3413  * The function is provided primarily for OSS layer and USB gadget drivers,
3414  * and it allows only the limited set of ioctls (hw_params, sw_params,
3415  * prepare, start, drain, drop, forward).
3416  *
3417  * Return: zero if successful, or a negative error code
3418  */
3419 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3420                          unsigned int cmd, void *arg)
3421 {
3422         snd_pcm_uframes_t *frames = arg;
3423         snd_pcm_sframes_t result;
3424
3425         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3426                 return -EBADFD;
3427
3428         switch (cmd) {
3429         case SNDRV_PCM_IOCTL_FORWARD:
3430         {
3431                 /* provided only for OSS; capture-only and no value returned */
3432                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3433                         return -EINVAL;
3434                 result = snd_pcm_forward(substream, *frames);
3435                 return result < 0 ? result : 0;
3436         }
3437         case SNDRV_PCM_IOCTL_HW_PARAMS:
3438                 return snd_pcm_hw_params(substream, arg);
3439         case SNDRV_PCM_IOCTL_SW_PARAMS:
3440                 return snd_pcm_sw_params(substream, arg);
3441         case SNDRV_PCM_IOCTL_PREPARE:
3442                 return snd_pcm_prepare(substream, NULL);
3443         case SNDRV_PCM_IOCTL_START:
3444                 return snd_pcm_start_lock_irq(substream);
3445         case SNDRV_PCM_IOCTL_DRAIN:
3446                 return snd_pcm_drain(substream, NULL);
3447         case SNDRV_PCM_IOCTL_DROP:
3448                 return snd_pcm_drop(substream);
3449         case SNDRV_PCM_IOCTL_DELAY:
3450                 return snd_pcm_delay(substream, frames);
3451         default:
3452                 return -EINVAL;
3453         }
3454 }
3455 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3456
3457 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3458                             loff_t * offset)
3459 {
3460         struct snd_pcm_file *pcm_file;
3461         struct snd_pcm_substream *substream;
3462         struct snd_pcm_runtime *runtime;
3463         snd_pcm_sframes_t result;
3464
3465         pcm_file = file->private_data;
3466         substream = pcm_file->substream;
3467         if (PCM_RUNTIME_CHECK(substream))
3468                 return -ENXIO;
3469         runtime = substream->runtime;
3470         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3471             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3472                 return -EBADFD;
3473         if (!frame_aligned(runtime, count))
3474                 return -EINVAL;
3475         count = bytes_to_frames(runtime, count);
3476         result = snd_pcm_lib_read(substream, buf, count);
3477         if (result > 0)
3478                 result = frames_to_bytes(runtime, result);
3479         return result;
3480 }
3481
3482 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3483                              size_t count, loff_t * offset)
3484 {
3485         struct snd_pcm_file *pcm_file;
3486         struct snd_pcm_substream *substream;
3487         struct snd_pcm_runtime *runtime;
3488         snd_pcm_sframes_t result;
3489
3490         pcm_file = file->private_data;
3491         substream = pcm_file->substream;
3492         if (PCM_RUNTIME_CHECK(substream))
3493                 return -ENXIO;
3494         runtime = substream->runtime;
3495         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3496             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3497                 return -EBADFD;
3498         if (!frame_aligned(runtime, count))
3499                 return -EINVAL;
3500         count = bytes_to_frames(runtime, count);
3501         result = snd_pcm_lib_write(substream, buf, count);
3502         if (result > 0)
3503                 result = frames_to_bytes(runtime, result);
3504         return result;
3505 }
3506
3507 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3508 {
3509         struct snd_pcm_file *pcm_file;
3510         struct snd_pcm_substream *substream;
3511         struct snd_pcm_runtime *runtime;
3512         snd_pcm_sframes_t result;
3513         unsigned long i;
3514         void __user **bufs;
3515         snd_pcm_uframes_t frames;
3516
3517         pcm_file = iocb->ki_filp->private_data;
3518         substream = pcm_file->substream;
3519         if (PCM_RUNTIME_CHECK(substream))
3520                 return -ENXIO;
3521         runtime = substream->runtime;
3522         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3523             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3524                 return -EBADFD;
3525         if (!iter_is_iovec(to))
3526                 return -EINVAL;
3527         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3528                 return -EINVAL;
3529         if (!frame_aligned(runtime, to->iov->iov_len))
3530                 return -EINVAL;
3531         frames = bytes_to_samples(runtime, to->iov->iov_len);
3532         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3533         if (bufs == NULL)
3534                 return -ENOMEM;
3535         for (i = 0; i < to->nr_segs; ++i)
3536                 bufs[i] = to->iov[i].iov_base;
3537         result = snd_pcm_lib_readv(substream, bufs, frames);
3538         if (result > 0)
3539                 result = frames_to_bytes(runtime, result);
3540         kfree(bufs);
3541         return result;
3542 }
3543
3544 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3545 {
3546         struct snd_pcm_file *pcm_file;
3547         struct snd_pcm_substream *substream;
3548         struct snd_pcm_runtime *runtime;
3549         snd_pcm_sframes_t result;
3550         unsigned long i;
3551         void __user **bufs;
3552         snd_pcm_uframes_t frames;
3553
3554         pcm_file = iocb->ki_filp->private_data;
3555         substream = pcm_file->substream;
3556         if (PCM_RUNTIME_CHECK(substream))
3557                 return -ENXIO;
3558         runtime = substream->runtime;
3559         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3560             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3561                 return -EBADFD;
3562         if (!iter_is_iovec(from))
3563                 return -EINVAL;
3564         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3565             !frame_aligned(runtime, from->iov->iov_len))
3566                 return -EINVAL;
3567         frames = bytes_to_samples(runtime, from->iov->iov_len);
3568         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3569         if (bufs == NULL)
3570                 return -ENOMEM;
3571         for (i = 0; i < from->nr_segs; ++i)
3572                 bufs[i] = from->iov[i].iov_base;
3573         result = snd_pcm_lib_writev(substream, bufs, frames);
3574         if (result > 0)
3575                 result = frames_to_bytes(runtime, result);
3576         kfree(bufs);
3577         return result;
3578 }
3579
3580 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3581 {
3582         struct snd_pcm_file *pcm_file;
3583         struct snd_pcm_substream *substream;
3584         struct snd_pcm_runtime *runtime;
3585         __poll_t mask, ok;
3586         snd_pcm_uframes_t avail;
3587
3588         pcm_file = file->private_data;
3589
3590         substream = pcm_file->substream;
3591         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3592                 ok = EPOLLOUT | EPOLLWRNORM;
3593         else
3594                 ok = EPOLLIN | EPOLLRDNORM;
3595         if (PCM_RUNTIME_CHECK(substream))
3596                 return ok | EPOLLERR;
3597
3598         runtime = substream->runtime;
3599         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3600                 return ok | EPOLLERR;
3601
3602         poll_wait(file, &runtime->sleep, wait);
3603
3604         mask = 0;
3605         snd_pcm_stream_lock_irq(substream);
3606         avail = snd_pcm_avail(substream);
3607         switch (runtime->state) {
3608         case SNDRV_PCM_STATE_RUNNING:
3609         case SNDRV_PCM_STATE_PREPARED:
3610         case SNDRV_PCM_STATE_PAUSED:
3611                 if (avail >= runtime->control->avail_min)
3612                         mask = ok;
3613                 break;
3614         case SNDRV_PCM_STATE_DRAINING:
3615                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3616                         mask = ok;
3617                         if (!avail)
3618                                 mask |= EPOLLERR;
3619                 }
3620                 break;
3621         default:
3622                 mask = ok | EPOLLERR;
3623                 break;
3624         }
3625         snd_pcm_stream_unlock_irq(substream);
3626         return mask;
3627 }
3628
3629 /*
3630  * mmap support
3631  */
3632
3633 /*
3634  * Only on coherent architectures, we can mmap the status and the control records
3635  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3636  */
3637 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3638 /*
3639  * mmap status record
3640  */
3641 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3642 {
3643         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3644         struct snd_pcm_runtime *runtime;
3645
3646         if (substream == NULL)
3647                 return VM_FAULT_SIGBUS;
3648         runtime = substream->runtime;
3649         vmf->page = virt_to_page(runtime->status);
3650         get_page(vmf->page);
3651         return 0;
3652 }
3653
3654 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3655 {
3656         .fault =        snd_pcm_mmap_status_fault,
3657 };
3658
3659 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3660                                struct vm_area_struct *area)
3661 {
3662         long size;
3663         if (!(area->vm_flags & VM_READ))
3664                 return -EINVAL;
3665         size = area->vm_end - area->vm_start;
3666         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3667                 return -EINVAL;
3668         area->vm_ops = &snd_pcm_vm_ops_status;
3669         area->vm_private_data = substream;
3670         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3671         area->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
3672         return 0;
3673 }
3674
3675 /*
3676  * mmap control record
3677  */
3678 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3679 {
3680         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3681         struct snd_pcm_runtime *runtime;
3682
3683         if (substream == NULL)
3684                 return VM_FAULT_SIGBUS;
3685         runtime = substream->runtime;
3686         vmf->page = virt_to_page(runtime->control);
3687         get_page(vmf->page);
3688         return 0;
3689 }
3690
3691 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3692 {
3693         .fault =        snd_pcm_mmap_control_fault,
3694 };
3695
3696 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3697                                 struct vm_area_struct *area)
3698 {
3699         long size;
3700         if (!(area->vm_flags & VM_READ))
3701                 return -EINVAL;
3702         size = area->vm_end - area->vm_start;
3703         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3704                 return -EINVAL;
3705         area->vm_ops = &snd_pcm_vm_ops_control;
3706         area->vm_private_data = substream;
3707         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3708         return 0;
3709 }
3710
3711 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3712 {
3713         /* If drivers require the explicit sync (typically for non-coherent
3714          * pages), we have to disable the mmap of status and control data
3715          * to enforce the control via SYNC_PTR ioctl.
3716          */
3717         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3718                 return false;
3719         /* See pcm_control_mmap_allowed() below.
3720          * Since older alsa-lib requires both status and control mmaps to be
3721          * coupled, we have to disable the status mmap for old alsa-lib, too.
3722          */
3723         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3724             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3725                 return false;
3726         return true;
3727 }
3728
3729 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3730 {
3731         if (pcm_file->no_compat_mmap)
3732                 return false;
3733         /* see above */
3734         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3735                 return false;
3736         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3737          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3738          * thus it effectively assures the manual update of appl_ptr.
3739          */
3740         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3741                 return false;
3742         return true;
3743 }
3744
3745 #else /* ! coherent mmap */
3746 /*
3747  * don't support mmap for status and control records.
3748  */
3749 #define pcm_status_mmap_allowed(pcm_file)       false
3750 #define pcm_control_mmap_allowed(pcm_file)      false
3751
3752 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3753                                struct vm_area_struct *area)
3754 {
3755         return -ENXIO;
3756 }
3757 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3758                                 struct vm_area_struct *area)
3759 {
3760         return -ENXIO;
3761 }
3762 #endif /* coherent mmap */
3763
3764 /*
3765  * fault callback for mmapping a RAM page
3766  */
3767 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3768 {
3769         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3770         struct snd_pcm_runtime *runtime;
3771         unsigned long offset;
3772         struct page * page;
3773         size_t dma_bytes;
3774
3775         if (substream == NULL)
3776                 return VM_FAULT_SIGBUS;
3777         runtime = substream->runtime;
3778         offset = vmf->pgoff << PAGE_SHIFT;
3779         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3780         if (offset > dma_bytes - PAGE_SIZE)
3781                 return VM_FAULT_SIGBUS;
3782         if (substream->ops->page)
3783                 page = substream->ops->page(substream, offset);
3784         else if (!snd_pcm_get_dma_buf(substream))
3785                 page = virt_to_page(runtime->dma_area + offset);
3786         else
3787                 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3788         if (!page)
3789                 return VM_FAULT_SIGBUS;
3790         get_page(page);
3791         vmf->page = page;
3792         return 0;
3793 }
3794
3795 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3796         .open =         snd_pcm_mmap_data_open,
3797         .close =        snd_pcm_mmap_data_close,
3798 };
3799
3800 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3801         .open =         snd_pcm_mmap_data_open,
3802         .close =        snd_pcm_mmap_data_close,
3803         .fault =        snd_pcm_mmap_data_fault,
3804 };
3805
3806 /*
3807  * mmap the DMA buffer on RAM
3808  */
3809
3810 /**
3811  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3812  * @substream: PCM substream
3813  * @area: VMA
3814  *
3815  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3816  * this function is invoked implicitly.
3817  *
3818  * Return: zero if successful, or a negative error code
3819  */
3820 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3821                              struct vm_area_struct *area)
3822 {
3823         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3824         if (!substream->ops->page &&
3825             !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3826                 return 0;
3827         /* mmap with fault handler */
3828         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3829         return 0;
3830 }
3831 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3832
3833 /*
3834  * mmap the DMA buffer on I/O memory area
3835  */
3836 #if SNDRV_PCM_INFO_MMAP_IOMEM
3837 /**
3838  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3839  * @substream: PCM substream
3840  * @area: VMA
3841  *
3842  * When your hardware uses the iomapped pages as the hardware buffer and
3843  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3844  * is supposed to work only on limited architectures.
3845  *
3846  * Return: zero if successful, or a negative error code
3847  */
3848 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3849                            struct vm_area_struct *area)
3850 {
3851         struct snd_pcm_runtime *runtime = substream->runtime;
3852
3853         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3854         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3855 }
3856 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3857 #endif /* SNDRV_PCM_INFO_MMAP */
3858
3859 /*
3860  * mmap DMA buffer
3861  */
3862 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3863                       struct vm_area_struct *area)
3864 {
3865         struct snd_pcm_runtime *runtime;
3866         long size;
3867         unsigned long offset;
3868         size_t dma_bytes;
3869         int err;
3870
3871         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3872                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3873                         return -EINVAL;
3874         } else {
3875                 if (!(area->vm_flags & VM_READ))
3876                         return -EINVAL;
3877         }
3878         runtime = substream->runtime;
3879         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3880                 return -EBADFD;
3881         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3882                 return -ENXIO;
3883         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3884             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3885                 return -EINVAL;
3886         size = area->vm_end - area->vm_start;
3887         offset = area->vm_pgoff << PAGE_SHIFT;
3888         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3889         if ((size_t)size > dma_bytes)
3890                 return -EINVAL;
3891         if (offset > dma_bytes - size)
3892                 return -EINVAL;
3893
3894         area->vm_ops = &snd_pcm_vm_ops_data;
3895         area->vm_private_data = substream;
3896         if (substream->ops->mmap)
3897                 err = substream->ops->mmap(substream, area);
3898         else
3899                 err = snd_pcm_lib_default_mmap(substream, area);
3900         if (!err)
3901                 atomic_inc(&substream->mmap_count);
3902         return err;
3903 }
3904 EXPORT_SYMBOL(snd_pcm_mmap_data);
3905
3906 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3907 {
3908         struct snd_pcm_file * pcm_file;
3909         struct snd_pcm_substream *substream;
3910         unsigned long offset;
3911
3912         pcm_file = file->private_data;
3913         substream = pcm_file->substream;
3914         if (PCM_RUNTIME_CHECK(substream))
3915                 return -ENXIO;
3916         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3917                 return -EBADFD;
3918
3919         offset = area->vm_pgoff << PAGE_SHIFT;
3920         switch (offset) {
3921         case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3922                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3923                         return -ENXIO;
3924                 fallthrough;
3925         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3926                 if (!pcm_status_mmap_allowed(pcm_file))
3927                         return -ENXIO;
3928                 return snd_pcm_mmap_status(substream, file, area);
3929         case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3930                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3931                         return -ENXIO;
3932                 fallthrough;
3933         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3934                 if (!pcm_control_mmap_allowed(pcm_file))
3935                         return -ENXIO;
3936                 return snd_pcm_mmap_control(substream, file, area);
3937         default:
3938                 return snd_pcm_mmap_data(substream, file, area);
3939         }
3940         return 0;
3941 }
3942
3943 static int snd_pcm_fasync(int fd, struct file * file, int on)
3944 {
3945         struct snd_pcm_file * pcm_file;
3946         struct snd_pcm_substream *substream;
3947         struct snd_pcm_runtime *runtime;
3948
3949         pcm_file = file->private_data;
3950         substream = pcm_file->substream;
3951         if (PCM_RUNTIME_CHECK(substream))
3952                 return -ENXIO;
3953         runtime = substream->runtime;
3954         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3955                 return -EBADFD;
3956         return snd_fasync_helper(fd, file, on, &runtime->fasync);
3957 }
3958
3959 /*
3960  * ioctl32 compat
3961  */
3962 #ifdef CONFIG_COMPAT
3963 #include "pcm_compat.c"
3964 #else
3965 #define snd_pcm_ioctl_compat    NULL
3966 #endif
3967
3968 /*
3969  *  To be removed helpers to keep binary compatibility
3970  */
3971
3972 #ifdef CONFIG_SND_SUPPORT_OLD_API
3973 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3974 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3975
3976 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3977                                                struct snd_pcm_hw_params_old *oparams)
3978 {
3979         unsigned int i;
3980
3981         memset(params, 0, sizeof(*params));
3982         params->flags = oparams->flags;
3983         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3984                 params->masks[i].bits[0] = oparams->masks[i];
3985         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3986         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3987         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3988         params->info = oparams->info;
3989         params->msbits = oparams->msbits;
3990         params->rate_num = oparams->rate_num;
3991         params->rate_den = oparams->rate_den;
3992         params->fifo_size = oparams->fifo_size;
3993 }
3994
3995 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3996                                              struct snd_pcm_hw_params *params)
3997 {
3998         unsigned int i;
3999
4000         memset(oparams, 0, sizeof(*oparams));
4001         oparams->flags = params->flags;
4002         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4003                 oparams->masks[i] = params->masks[i].bits[0];
4004         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4005         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4006         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4007         oparams->info = params->info;
4008         oparams->msbits = params->msbits;
4009         oparams->rate_num = params->rate_num;
4010         oparams->rate_den = params->rate_den;
4011         oparams->fifo_size = params->fifo_size;
4012 }
4013
4014 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4015                                       struct snd_pcm_hw_params_old __user * _oparams)
4016 {
4017         struct snd_pcm_hw_params *params;
4018         struct snd_pcm_hw_params_old *oparams = NULL;
4019         int err;
4020
4021         params = kmalloc(sizeof(*params), GFP_KERNEL);
4022         if (!params)
4023                 return -ENOMEM;
4024
4025         oparams = memdup_user(_oparams, sizeof(*oparams));
4026         if (IS_ERR(oparams)) {
4027                 err = PTR_ERR(oparams);
4028                 goto out;
4029         }
4030         snd_pcm_hw_convert_from_old_params(params, oparams);
4031         err = snd_pcm_hw_refine(substream, params);
4032         if (err < 0)
4033                 goto out_old;
4034
4035         err = fixup_unreferenced_params(substream, params);
4036         if (err < 0)
4037                 goto out_old;
4038
4039         snd_pcm_hw_convert_to_old_params(oparams, params);
4040         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4041                 err = -EFAULT;
4042 out_old:
4043         kfree(oparams);
4044 out:
4045         kfree(params);
4046         return err;
4047 }
4048
4049 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4050                                       struct snd_pcm_hw_params_old __user * _oparams)
4051 {
4052         struct snd_pcm_hw_params *params;
4053         struct snd_pcm_hw_params_old *oparams = NULL;
4054         int err;
4055
4056         params = kmalloc(sizeof(*params), GFP_KERNEL);
4057         if (!params)
4058                 return -ENOMEM;
4059
4060         oparams = memdup_user(_oparams, sizeof(*oparams));
4061         if (IS_ERR(oparams)) {
4062                 err = PTR_ERR(oparams);
4063                 goto out;
4064         }
4065
4066         snd_pcm_hw_convert_from_old_params(params, oparams);
4067         err = snd_pcm_hw_params(substream, params);
4068         if (err < 0)
4069                 goto out_old;
4070
4071         snd_pcm_hw_convert_to_old_params(oparams, params);
4072         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4073                 err = -EFAULT;
4074 out_old:
4075         kfree(oparams);
4076 out:
4077         kfree(params);
4078         return err;
4079 }
4080 #endif /* CONFIG_SND_SUPPORT_OLD_API */
4081
4082 #ifndef CONFIG_MMU
4083 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4084                                                unsigned long addr,
4085                                                unsigned long len,
4086                                                unsigned long pgoff,
4087                                                unsigned long flags)
4088 {
4089         struct snd_pcm_file *pcm_file = file->private_data;
4090         struct snd_pcm_substream *substream = pcm_file->substream;
4091         struct snd_pcm_runtime *runtime = substream->runtime;
4092         unsigned long offset = pgoff << PAGE_SHIFT;
4093
4094         switch (offset) {
4095         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4096                 return (unsigned long)runtime->status;
4097         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4098                 return (unsigned long)runtime->control;
4099         default:
4100                 return (unsigned long)runtime->dma_area + offset;
4101         }
4102 }
4103 #else
4104 # define snd_pcm_get_unmapped_area NULL
4105 #endif
4106
4107 /*
4108  *  Register section
4109  */
4110
4111 const struct file_operations snd_pcm_f_ops[2] = {
4112         {
4113                 .owner =                THIS_MODULE,
4114                 .write =                snd_pcm_write,
4115                 .write_iter =           snd_pcm_writev,
4116                 .open =                 snd_pcm_playback_open,
4117                 .release =              snd_pcm_release,
4118                 .llseek =               no_llseek,
4119                 .poll =                 snd_pcm_poll,
4120                 .unlocked_ioctl =       snd_pcm_ioctl,
4121                 .compat_ioctl =         snd_pcm_ioctl_compat,
4122                 .mmap =                 snd_pcm_mmap,
4123                 .fasync =               snd_pcm_fasync,
4124                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4125         },
4126         {
4127                 .owner =                THIS_MODULE,
4128                 .read =                 snd_pcm_read,
4129                 .read_iter =            snd_pcm_readv,
4130                 .open =                 snd_pcm_capture_open,
4131                 .release =              snd_pcm_release,
4132                 .llseek =               no_llseek,
4133                 .poll =                 snd_pcm_poll,
4134                 .unlocked_ioctl =       snd_pcm_ioctl,
4135                 .compat_ioctl =         snd_pcm_ioctl_compat,
4136                 .mmap =                 snd_pcm_mmap,
4137                 .fasync =               snd_pcm_fasync,
4138                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4139         }
4140 };