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