sound/core/pcm_native.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Digital Audio (PCM) abstract layer
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6
   7 #include <linux/compat.h>
   8 #include <linux/mm.h>
   9 #include <linux/module.h>
  10 #include <linux/file.h>
  11 #include <linux/slab.h>
  12 #include <linux/sched/signal.h>
  13 #include <linux/time.h>
  14 #include <linux/pm_qos.h>
  15 #include <linux/io.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/vmalloc.h>
  18 #include <sound/core.h>
  19 #include <sound/control.h>
  20 #include <sound/info.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/timer.h>
  24 #include <sound/minors.h>
  25 #include <linux/uio.h>
  26 #include <linux/delay.h>
  27
  28 #include "pcm_local.h"
  29
  30 #ifdef CONFIG_SND_DEBUG
  31 #define CREATE_TRACE_POINTS
  32 #include "pcm_param_trace.h"
  33 #else
  34 #define trace_hw_mask_param_enabled()           0
  35 #define trace_hw_interval_param_enabled()       0
  36 #define trace_hw_mask_param(substream, type, index, prev, curr)
  37 #define trace_hw_interval_param(substream, type, index, prev, curr)
  38 #endif
  39
  40 /*
  41  *  Compatibility
  42  */
  43
  44 struct snd_pcm_hw_params_old {
  45         unsigned int flags;
  46         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  47                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  48         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  49                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  50         unsigned int rmask;
  51         unsigned int cmask;
  52         unsigned int info;
  53         unsigned int msbits;
  54         unsigned int rate_num;
  55         unsigned int rate_den;
  56         snd_pcm_uframes_t fifo_size;
  57         unsigned char reserved[64];
  58 };
  59
  60 #ifdef CONFIG_SND_SUPPORT_OLD_API
  61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  63
  64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 #endif
  69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  70
  71 /*
  72  *
  73  */
  74
  75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  76
  77 void snd_pcm_group_init(struct snd_pcm_group *group)
  78 {
  79         spin_lock_init(&group->lock);
  80         mutex_init(&group->mutex);
  81         INIT_LIST_HEAD(&group->substreams);
  82         refcount_set(&group->refs, 1);
  83 }
  84
  85 /* define group lock helpers */
  86 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
  87 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
  88 { \
  89         if (nonatomic) \
  90                 mutex_ ## mutex_action(&group->mutex); \
  91         else \
  92                 spin_ ## action(&group->lock); \
  93 }
  94
  95 DEFINE_PCM_GROUP_LOCK(lock, lock);
  96 DEFINE_PCM_GROUP_LOCK(unlock, unlock);
  97 DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
  98 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
  99
 100 /**
 101  * snd_pcm_stream_lock - Lock the PCM stream
 102  * @substream: PCM substream
 103  *
 104  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 105  * flag of the given substream.  This also takes the global link rw lock
 106  * (or rw sem), too, for avoiding the race with linked streams.
 107  */
 108 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 109 {
 110         snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
 111 }
 112 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
 113
 114 /**
 115  * snd_pcm_stream_unlock - Unlock the PCM stream
 116  * @substream: PCM substream
 117  *
 118  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
 119  */
 120 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 121 {
 122         snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
 123 }
 124 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
 125
 126 /**
 127  * snd_pcm_stream_lock_irq - Lock the PCM stream
 128  * @substream: PCM substream
 129  *
 130  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
 131  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 132  * as snd_pcm_stream_lock().
 133  */
 134 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 135 {
 136         snd_pcm_group_lock_irq(&substream->self_group,
 137                                substream->pcm->nonatomic);
 138 }
 139 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
 140
 141 static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
 142 {
 143         struct snd_pcm_group *group = &substream->self_group;
 144
 145         if (substream->pcm->nonatomic)
 146                 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
 147         else
 148                 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
 149 }
 150
 151 /**
 152  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 153  * @substream: PCM substream
 154  *
 155  * This is a counter-part of snd_pcm_stream_lock_irq().
 156  */
 157 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 158 {
 159         snd_pcm_group_unlock_irq(&substream->self_group,
 160                                  substream->pcm->nonatomic);
 161 }
 162 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
 163
 164 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
 165 {
 166         unsigned long flags = 0;
 167         if (substream->pcm->nonatomic)
 168                 mutex_lock(&substream->self_group.mutex);
 169         else
 170                 spin_lock_irqsave(&substream->self_group.lock, flags);
 171         return flags;
 172 }
 173 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
 174
 175 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
 176 {
 177         unsigned long flags = 0;
 178         if (substream->pcm->nonatomic)
 179                 mutex_lock_nested(&substream->self_group.mutex,
 180                                   SINGLE_DEPTH_NESTING);
 181         else
 182                 spin_lock_irqsave_nested(&substream->self_group.lock, flags,
 183                                          SINGLE_DEPTH_NESTING);
 184         return flags;
 185 }
 186 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
 187
 188 /**
 189  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
 190  * @substream: PCM substream
 191  * @flags: irq flags
 192  *
 193  * This is a counter-part of snd_pcm_stream_lock_irqsave().
 194  */
 195 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 196                                       unsigned long flags)
 197 {
 198         if (substream->pcm->nonatomic)
 199                 mutex_unlock(&substream->self_group.mutex);
 200         else
 201                 spin_unlock_irqrestore(&substream->self_group.lock, flags);
 202 }
 203 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
 204
 205 /* Run PCM ioctl ops */
 206 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
 207                              unsigned cmd, void *arg)
 208 {
 209         if (substream->ops->ioctl)
 210                 return substream->ops->ioctl(substream, cmd, arg);
 211         else
 212                 return snd_pcm_lib_ioctl(substream, cmd, arg);
 213 }
 214
 215 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
 216 {
 217         struct snd_pcm *pcm = substream->pcm;
 218         struct snd_pcm_str *pstr = substream->pstr;
 219
 220         memset(info, 0, sizeof(*info));
 221         info->card = pcm->card->number;
 222         info->device = pcm->device;
 223         info->stream = substream->stream;
 224         info->subdevice = substream->number;
 225         strscpy(info->id, pcm->id, sizeof(info->id));
 226         strscpy(info->name, pcm->name, sizeof(info->name));
 227         info->dev_class = pcm->dev_class;
 228         info->dev_subclass = pcm->dev_subclass;
 229         info->subdevices_count = pstr->substream_count;
 230         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 231         strscpy(info->subname, substream->name, sizeof(info->subname));
 232
 233         return 0;
 234 }
 235
 236 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 237                       struct snd_pcm_info __user * _info)
 238 {
 239         struct snd_pcm_info *info;
 240         int err;
 241
 242         info = kmalloc(sizeof(*info), GFP_KERNEL);
 243         if (! info)
 244                 return -ENOMEM;
 245         err = snd_pcm_info(substream, info);
 246         if (err >= 0) {
 247                 if (copy_to_user(_info, info, sizeof(*info)))
 248                         err = -EFAULT;
 249         }
 250         kfree(info);
 251         return err;
 252 }
 253
 254 /* macro for simplified cast */
 255 #define PARAM_MASK_BIT(b)       (1U << (__force int)(b))
 256
 257 static bool hw_support_mmap(struct snd_pcm_substream *substream)
 258 {
 259         struct snd_dma_buffer *dmabuf;
 260
 261         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 262                 return false;
 263
 264         if (substream->ops->mmap || substream->ops->page)
 265                 return true;
 266
 267         dmabuf = snd_pcm_get_dma_buf(substream);
 268         if (!dmabuf)
 269                 dmabuf = &substream->dma_buffer;
 270         switch (dmabuf->dev.type) {
 271         case SNDRV_DMA_TYPE_UNKNOWN:
 272                 /* we can't know the device, so just assume that the driver does
 273                  * everything right
 274                  */
 275                 return true;
 276         case SNDRV_DMA_TYPE_CONTINUOUS:
 277         case SNDRV_DMA_TYPE_VMALLOC:
 278                 return true;
 279         default:
 280                 return dma_can_mmap(dmabuf->dev.dev);
 281         }
 282 }
 283
 284 static int constrain_mask_params(struct snd_pcm_substream *substream,
 285                                  struct snd_pcm_hw_params *params)
 286 {
 287         struct snd_pcm_hw_constraints *constrs =
 288                                         &substream->runtime->hw_constraints;
 289         struct snd_mask *m;
 290         unsigned int k;
 291         struct snd_mask old_mask;
 292         int changed;
 293
 294         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 295                 m = hw_param_mask(params, k);
 296                 if (snd_mask_empty(m))
 297                         return -EINVAL;
 298
 299                 /* This parameter is not requested to change by a caller. */
 300                 if (!(params->rmask & PARAM_MASK_BIT(k)))
 301                         continue;
 302
 303                 if (trace_hw_mask_param_enabled())
 304                         old_mask = *m;
 305
 306                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 307                 if (changed < 0)
 308                         return changed;
 309                 if (changed == 0)
 310                         continue;
 311
 312                 /* Set corresponding flag so that the caller gets it. */
 313                 trace_hw_mask_param(substream, k, 0, &old_mask, m);
 314                 params->cmask |= PARAM_MASK_BIT(k);
 315         }
 316
 317         return 0;
 318 }
 319
 320 static int constrain_interval_params(struct snd_pcm_substream *substream,
 321                                      struct snd_pcm_hw_params *params)
 322 {
 323         struct snd_pcm_hw_constraints *constrs =
 324                                         &substream->runtime->hw_constraints;
 325         struct snd_interval *i;
 326         unsigned int k;
 327         struct snd_interval old_interval;
 328         int changed;
 329
 330         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 331                 i = hw_param_interval(params, k);
 332                 if (snd_interval_empty(i))
 333                         return -EINVAL;
 334
 335                 /* This parameter is not requested to change by a caller. */
 336                 if (!(params->rmask & PARAM_MASK_BIT(k)))
 337                         continue;
 338
 339                 if (trace_hw_interval_param_enabled())
 340                         old_interval = *i;
 341
 342                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 343                 if (changed < 0)
 344                         return changed;
 345                 if (changed == 0)
 346                         continue;
 347
 348                 /* Set corresponding flag so that the caller gets it. */
 349                 trace_hw_interval_param(substream, k, 0, &old_interval, i);
 350                 params->cmask |= PARAM_MASK_BIT(k);
 351         }
 352
 353         return 0;
 354 }
 355
 356 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
 357                                      struct snd_pcm_hw_params *params)
 358 {
 359         struct snd_pcm_hw_constraints *constrs =
 360                                         &substream->runtime->hw_constraints;
 361         unsigned int k;
 362         unsigned int *rstamps;
 363         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 364         unsigned int stamp;
 365         struct snd_pcm_hw_rule *r;
 366         unsigned int d;
 367         struct snd_mask old_mask;
 368         struct snd_interval old_interval;
 369         bool again;
 370         int changed, err = 0;
 371
 372         /*
 373          * Each application of rule has own sequence number.
 374          *
 375          * Each member of 'rstamps' array represents the sequence number of
 376          * recent application of corresponding rule.
 377          */
 378         rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
 379         if (!rstamps)
 380                 return -ENOMEM;
 381
 382         /*
 383          * Each member of 'vstamps' array represents the sequence number of
 384          * recent application of rule in which corresponding parameters were
 385          * changed.
 386          *
 387          * In initial state, elements corresponding to parameters requested by
 388          * a caller is 1. For unrequested parameters, corresponding members
 389          * have 0 so that the parameters are never changed anymore.
 390          */
 391         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 392                 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
 393
 394         /* Due to the above design, actual sequence number starts at 2. */
 395         stamp = 2;
 396 retry:
 397         /* Apply all rules in order. */
 398         again = false;
 399         for (k = 0; k < constrs->rules_num; k++) {
 400                 r = &constrs->rules[k];
 401
 402                 /*
 403                  * Check condition bits of this rule. When the rule has
 404                  * some condition bits, parameter without the bits is
 405                  * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
 406                  * is an example of the condition bits.
 407                  */
 408                 if (r->cond && !(r->cond & params->flags))
 409                         continue;
 410
 411                 /*
 412                  * The 'deps' array includes maximum four dependencies
 413                  * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
 414                  * member of this array is a sentinel and should be
 415                  * negative value.
 416                  *
 417                  * This rule should be processed in this time when dependent
 418                  * parameters were changed at former applications of the other
 419                  * rules.
 420                  */
 421                 for (d = 0; r->deps[d] >= 0; d++) {
 422                         if (vstamps[r->deps[d]] > rstamps[k])
 423                                 break;
 424                 }
 425                 if (r->deps[d] < 0)
 426                         continue;
 427
 428                 if (trace_hw_mask_param_enabled()) {
 429                         if (hw_is_mask(r->var))
 430                                 old_mask = *hw_param_mask(params, r->var);
 431                 }
 432                 if (trace_hw_interval_param_enabled()) {
 433                         if (hw_is_interval(r->var))
 434                                 old_interval = *hw_param_interval(params, r->var);
 435                 }
 436
 437                 changed = r->func(params, r);
 438                 if (changed < 0) {
 439                         err = changed;
 440                         goto out;
 441                 }
 442
 443                 /*
 444                  * When the parameter is changed, notify it to the caller
 445                  * by corresponding returned bit, then preparing for next
 446                  * iteration.
 447                  */
 448                 if (changed && r->var >= 0) {
 449                         if (hw_is_mask(r->var)) {
 450                                 trace_hw_mask_param(substream, r->var,
 451                                         k + 1, &old_mask,
 452                                         hw_param_mask(params, r->var));
 453                         }
 454                         if (hw_is_interval(r->var)) {
 455                                 trace_hw_interval_param(substream, r->var,
 456                                         k + 1, &old_interval,
 457                                         hw_param_interval(params, r->var));
 458                         }
 459
 460                         params->cmask |= PARAM_MASK_BIT(r->var);
 461                         vstamps[r->var] = stamp;
 462                         again = true;
 463                 }
 464
 465                 rstamps[k] = stamp++;
 466         }
 467
 468         /* Iterate to evaluate all rules till no parameters are changed. */
 469         if (again)
 470                 goto retry;
 471
 472  out:
 473         kfree(rstamps);
 474         return err;
 475 }
 476
 477 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
 478                                      struct snd_pcm_hw_params *params)
 479 {
 480         const struct snd_interval *i;
 481         const struct snd_mask *m;
 482         int err;
 483
 484         if (!params->msbits) {
 485                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 486                 if (snd_interval_single(i))
 487                         params->msbits = snd_interval_value(i);
 488         }
 489
 490         if (!params->rate_den) {
 491                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 492                 if (snd_interval_single(i)) {
 493                         params->rate_num = snd_interval_value(i);
 494                         params->rate_den = 1;
 495                 }
 496         }
 497
 498         if (!params->fifo_size) {
 499                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 500                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 501                 if (snd_mask_single(m) && snd_interval_single(i)) {
 502                         err = snd_pcm_ops_ioctl(substream,
 503                                                 SNDRV_PCM_IOCTL1_FIFO_SIZE,
 504                                                 params);
 505                         if (err < 0)
 506                                 return err;
 507                 }
 508         }
 509
 510         if (!params->info) {
 511                 params->info = substream->runtime->hw.info;
 512                 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
 513                                   SNDRV_PCM_INFO_DRAIN_TRIGGER);
 514                 if (!hw_support_mmap(substream))
 515                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
 516                                           SNDRV_PCM_INFO_MMAP_VALID);
 517         }
 518
 519         return 0;
 520 }
 521
 522 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 523                       struct snd_pcm_hw_params *params)
 524 {
 525         int err;
 526
 527         params->info = 0;
 528         params->fifo_size = 0;
 529         if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 530                 params->msbits = 0;
 531         if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
 532                 params->rate_num = 0;
 533                 params->rate_den = 0;
 534         }
 535
 536         err = constrain_mask_params(substream, params);
 537         if (err < 0)
 538                 return err;
 539
 540         err = constrain_interval_params(substream, params);
 541         if (err < 0)
 542                 return err;
 543
 544         err = constrain_params_by_rules(substream, params);
 545         if (err < 0)
 546                 return err;
 547
 548         params->rmask = 0;
 549
 550         return 0;
 551 }
 552 EXPORT_SYMBOL(snd_pcm_hw_refine);
 553
 554 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 555                                   struct snd_pcm_hw_params __user * _params)
 556 {
 557         struct snd_pcm_hw_params *params;
 558         int err;
 559
 560         params = memdup_user(_params, sizeof(*params));
 561         if (IS_ERR(params))
 562                 return PTR_ERR(params);
 563
 564         err = snd_pcm_hw_refine(substream, params);
 565         if (err < 0)
 566                 goto end;
 567
 568         err = fixup_unreferenced_params(substream, params);
 569         if (err < 0)
 570                 goto end;
 571
 572         if (copy_to_user(_params, params, sizeof(*params)))
 573                 err = -EFAULT;
 574 end:
 575         kfree(params);
 576         return err;
 577 }
 578
 579 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 580 {
 581         int usecs;
 582
 583         if (! runtime->rate)
 584                 return -1; /* invalid */
 585
 586         /* take 75% of period time as the deadline */
 587         usecs = (750000 / runtime->rate) * runtime->period_size;
 588         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 589                 runtime->rate;
 590
 591         return usecs;
 592 }
 593
 594 static void snd_pcm_set_state(struct snd_pcm_substream *substream,
 595                               snd_pcm_state_t state)
 596 {
 597         snd_pcm_stream_lock_irq(substream);
 598         if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
 599                 __snd_pcm_set_state(substream->runtime, state);
 600         snd_pcm_stream_unlock_irq(substream);
 601 }
 602
 603 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
 604                                         int event)
 605 {
 606 #ifdef CONFIG_SND_PCM_TIMER
 607         if (substream->timer)
 608                 snd_timer_notify(substream->timer, event,
 609                                         &substream->runtime->trigger_tstamp);
 610 #endif
 611 }
 612
 613 void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
 614 {
 615         if (substream->runtime && substream->runtime->stop_operating) {
 616                 substream->runtime->stop_operating = false;
 617                 if (substream->ops && substream->ops->sync_stop)
 618                         substream->ops->sync_stop(substream);
 619                 else if (sync_irq && substream->pcm->card->sync_irq > 0)
 620                         synchronize_irq(substream->pcm->card->sync_irq);
 621         }
 622 }
 623
 624 /**
 625  * snd_pcm_hw_params_choose - choose a configuration defined by @params
 626  * @pcm: PCM instance
 627  * @params: the hw_params instance
 628  *
 629  * Choose one configuration from configuration space defined by @params.
 630  * The configuration chosen is that obtained fixing in this order:
 631  * first access, first format, first subformat, min channels,
 632  * min rate, min period time, max buffer size, min tick time
 633  *
 634  * Return: Zero if successful, or a negative error code on failure.
 635  */
 636 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
 637                                     struct snd_pcm_hw_params *params)
 638 {
 639         static const int vars[] = {
 640                 SNDRV_PCM_HW_PARAM_ACCESS,
 641                 SNDRV_PCM_HW_PARAM_FORMAT,
 642                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
 643                 SNDRV_PCM_HW_PARAM_CHANNELS,
 644                 SNDRV_PCM_HW_PARAM_RATE,
 645                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 646                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 647                 SNDRV_PCM_HW_PARAM_TICK_TIME,
 648                 -1
 649         };
 650         const int *v;
 651         struct snd_mask old_mask;
 652         struct snd_interval old_interval;
 653         int changed;
 654
 655         for (v = vars; *v != -1; v++) {
 656                 /* Keep old parameter to trace. */
 657                 if (trace_hw_mask_param_enabled()) {
 658                         if (hw_is_mask(*v))
 659                                 old_mask = *hw_param_mask(params, *v);
 660                 }
 661                 if (trace_hw_interval_param_enabled()) {
 662                         if (hw_is_interval(*v))
 663                                 old_interval = *hw_param_interval(params, *v);
 664                 }
 665                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
 666                         changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
 667                 else
 668                         changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
 669                 if (changed < 0)
 670                         return changed;
 671                 if (changed == 0)
 672                         continue;
 673
 674                 /* Trace the changed parameter. */
 675                 if (hw_is_mask(*v)) {
 676                         trace_hw_mask_param(pcm, *v, 0, &old_mask,
 677                                             hw_param_mask(params, *v));
 678                 }
 679                 if (hw_is_interval(*v)) {
 680                         trace_hw_interval_param(pcm, *v, 0, &old_interval,
 681                                                 hw_param_interval(params, *v));
 682                 }
 683         }
 684
 685         return 0;
 686 }
 687
 688 /* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
 689  * block the further r/w operations
 690  */
 691 static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
 692 {
 693         if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
 694                 return -EBUSY;
 695         mutex_lock(&runtime->buffer_mutex);
 696         return 0; /* keep buffer_mutex, unlocked by below */
 697 }
 698
 699 /* release buffer_mutex and clear r/w access flag */
 700 static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
 701 {
 702         mutex_unlock(&runtime->buffer_mutex);
 703         atomic_inc(&runtime->buffer_accessing);
 704 }
 705
 706 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 707 #define is_oss_stream(substream)        ((substream)->oss.oss)
 708 #else
 709 #define is_oss_stream(substream)        false
 710 #endif
 711
 712 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 713                              struct snd_pcm_hw_params *params)
 714 {
 715         struct snd_pcm_runtime *runtime;
 716         int err, usecs;
 717         unsigned int bits;
 718         snd_pcm_uframes_t frames;
 719
 720         if (PCM_RUNTIME_CHECK(substream))
 721                 return -ENXIO;
 722         runtime = substream->runtime;
 723         err = snd_pcm_buffer_access_lock(runtime);
 724         if (err < 0)
 725                 return err;
 726         snd_pcm_stream_lock_irq(substream);
 727         switch (runtime->state) {
 728         case SNDRV_PCM_STATE_OPEN:
 729         case SNDRV_PCM_STATE_SETUP:
 730         case SNDRV_PCM_STATE_PREPARED:
 731                 if (!is_oss_stream(substream) &&
 732                     atomic_read(&substream->mmap_count))
 733                         err = -EBADFD;
 734                 break;
 735         default:
 736                 err = -EBADFD;
 737                 break;
 738         }
 739         snd_pcm_stream_unlock_irq(substream);
 740         if (err)
 741                 goto unlock;
 742
 743         snd_pcm_sync_stop(substream, true);
 744
 745         params->rmask = ~0U;
 746         err = snd_pcm_hw_refine(substream, params);
 747         if (err < 0)
 748                 goto _error;
 749
 750         err = snd_pcm_hw_params_choose(substream, params);
 751         if (err < 0)
 752                 goto _error;
 753
 754         err = fixup_unreferenced_params(substream, params);
 755         if (err < 0)
 756                 goto _error;
 757
 758         if (substream->managed_buffer_alloc) {
 759                 err = snd_pcm_lib_malloc_pages(substream,
 760                                                params_buffer_bytes(params));
 761                 if (err < 0)
 762                         goto _error;
 763                 runtime->buffer_changed = err > 0;
 764         }
 765
 766         if (substream->ops->hw_params != NULL) {
 767                 err = substream->ops->hw_params(substream, params);
 768                 if (err < 0)
 769                         goto _error;
 770         }
 771
 772         runtime->access = params_access(params);
 773         runtime->format = params_format(params);
 774         runtime->subformat = params_subformat(params);
 775         runtime->channels = params_channels(params);
 776         runtime->rate = params_rate(params);
 777         runtime->period_size = params_period_size(params);
 778         runtime->periods = params_periods(params);
 779         runtime->buffer_size = params_buffer_size(params);
 780         runtime->info = params->info;
 781         runtime->rate_num = params->rate_num;
 782         runtime->rate_den = params->rate_den;
 783         runtime->no_period_wakeup =
 784                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 785                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 786
 787         bits = snd_pcm_format_physical_width(runtime->format);
 788         runtime->sample_bits = bits;
 789         bits *= runtime->channels;
 790         runtime->frame_bits = bits;
 791         frames = 1;
 792         while (bits % 8 != 0) {
 793                 bits *= 2;
 794                 frames *= 2;
 795         }
 796         runtime->byte_align = bits / 8;
 797         runtime->min_align = frames;
 798
 799         /* Default sw params */
 800         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 801         runtime->period_step = 1;
 802         runtime->control->avail_min = runtime->period_size;
 803         runtime->start_threshold = 1;
 804         runtime->stop_threshold = runtime->buffer_size;
 805         runtime->silence_threshold = 0;
 806         runtime->silence_size = 0;
 807         runtime->boundary = runtime->buffer_size;
 808         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 809                 runtime->boundary *= 2;
 810
 811         /* clear the buffer for avoiding possible kernel info leaks */
 812         if (runtime->dma_area && !substream->ops->copy_user) {
 813                 size_t size = runtime->dma_bytes;
 814
 815                 if (runtime->info & SNDRV_PCM_INFO_MMAP)
 816                         size = PAGE_ALIGN(size);
 817                 memset(runtime->dma_area, 0, size);
 818         }
 819
 820         snd_pcm_timer_resolution_change(substream);
 821         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 822
 823         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
 824                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
 825         usecs = period_to_usecs(runtime);
 826         if (usecs >= 0)
 827                 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
 828                                             usecs);
 829         err = 0;
 830  _error:
 831         if (err) {
 832                 /* hardware might be unusable from this time,
 833                  * so we force application to retry to set
 834                  * the correct hardware parameter settings
 835                  */
 836                 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 837                 if (substream->ops->hw_free != NULL)
 838                         substream->ops->hw_free(substream);
 839                 if (substream->managed_buffer_alloc)
 840                         snd_pcm_lib_free_pages(substream);
 841         }
 842  unlock:
 843         snd_pcm_buffer_access_unlock(runtime);
 844         return err;
 845 }
 846
 847 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 848                                   struct snd_pcm_hw_params __user * _params)
 849 {
 850         struct snd_pcm_hw_params *params;
 851         int err;
 852
 853         params = memdup_user(_params, sizeof(*params));
 854         if (IS_ERR(params))
 855                 return PTR_ERR(params);
 856
 857         err = snd_pcm_hw_params(substream, params);
 858         if (err < 0)
 859                 goto end;
 860
 861         if (copy_to_user(_params, params, sizeof(*params)))
 862                 err = -EFAULT;
 863 end:
 864         kfree(params);
 865         return err;
 866 }
 867
 868 static int do_hw_free(struct snd_pcm_substream *substream)
 869 {
 870         int result = 0;
 871
 872         snd_pcm_sync_stop(substream, true);
 873         if (substream->ops->hw_free)
 874                 result = substream->ops->hw_free(substream);
 875         if (substream->managed_buffer_alloc)
 876                 snd_pcm_lib_free_pages(substream);
 877         return result;
 878 }
 879
 880 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 881 {
 882         struct snd_pcm_runtime *runtime;
 883         int result = 0;
 884
 885         if (PCM_RUNTIME_CHECK(substream))
 886                 return -ENXIO;
 887         runtime = substream->runtime;
 888         result = snd_pcm_buffer_access_lock(runtime);
 889         if (result < 0)
 890                 return result;
 891         snd_pcm_stream_lock_irq(substream);
 892         switch (runtime->state) {
 893         case SNDRV_PCM_STATE_SETUP:
 894         case SNDRV_PCM_STATE_PREPARED:
 895                 if (atomic_read(&substream->mmap_count))
 896                         result = -EBADFD;
 897                 break;
 898         default:
 899                 result = -EBADFD;
 900                 break;
 901         }
 902         snd_pcm_stream_unlock_irq(substream);
 903         if (result)
 904                 goto unlock;
 905         result = do_hw_free(substream);
 906         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 907         cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
 908  unlock:
 909         snd_pcm_buffer_access_unlock(runtime);
 910         return result;
 911 }
 912
 913 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 914                              struct snd_pcm_sw_params *params)
 915 {
 916         struct snd_pcm_runtime *runtime;
 917         int err;
 918
 919         if (PCM_RUNTIME_CHECK(substream))
 920                 return -ENXIO;
 921         runtime = substream->runtime;
 922         snd_pcm_stream_lock_irq(substream);
 923         if (runtime->state == SNDRV_PCM_STATE_OPEN) {
 924                 snd_pcm_stream_unlock_irq(substream);
 925                 return -EBADFD;
 926         }
 927         snd_pcm_stream_unlock_irq(substream);
 928
 929         if (params->tstamp_mode < 0 ||
 930             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 931                 return -EINVAL;
 932         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 933             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 934                 return -EINVAL;
 935         if (params->avail_min == 0)
 936                 return -EINVAL;
 937         if (params->silence_size >= runtime->boundary) {
 938                 if (params->silence_threshold != 0)
 939                         return -EINVAL;
 940         } else {
 941                 if (params->silence_size > params->silence_threshold)
 942                         return -EINVAL;
 943                 if (params->silence_threshold > runtime->buffer_size)
 944                         return -EINVAL;
 945         }
 946         err = 0;
 947         snd_pcm_stream_lock_irq(substream);
 948         runtime->tstamp_mode = params->tstamp_mode;
 949         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 950                 runtime->tstamp_type = params->tstamp_type;
 951         runtime->period_step = params->period_step;
 952         runtime->control->avail_min = params->avail_min;
 953         runtime->start_threshold = params->start_threshold;
 954         runtime->stop_threshold = params->stop_threshold;
 955         runtime->silence_threshold = params->silence_threshold;
 956         runtime->silence_size = params->silence_size;
 957         params->boundary = runtime->boundary;
 958         if (snd_pcm_running(substream)) {
 959                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 960                     runtime->silence_size > 0)
 961                         snd_pcm_playback_silence(substream, ULONG_MAX);
 962                 err = snd_pcm_update_state(substream, runtime);
 963         }
 964         snd_pcm_stream_unlock_irq(substream);
 965         return err;
 966 }
 967
 968 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 969                                   struct snd_pcm_sw_params __user * _params)
 970 {
 971         struct snd_pcm_sw_params params;
 972         int err;
 973         if (copy_from_user(&params, _params, sizeof(params)))
 974                 return -EFAULT;
 975         err = snd_pcm_sw_params(substream, &params);
 976         if (copy_to_user(_params, &params, sizeof(params)))
 977                 return -EFAULT;
 978         return err;
 979 }
 980
 981 static inline snd_pcm_uframes_t
 982 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
 983 {
 984         snd_pcm_uframes_t delay;
 985
 986         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 987                 delay = snd_pcm_playback_hw_avail(substream->runtime);
 988         else
 989                 delay = snd_pcm_capture_avail(substream->runtime);
 990         return delay + substream->runtime->delay;
 991 }
 992
 993 int snd_pcm_status64(struct snd_pcm_substream *substream,
 994                      struct snd_pcm_status64 *status)
 995 {
 996         struct snd_pcm_runtime *runtime = substream->runtime;
 997
 998         snd_pcm_stream_lock_irq(substream);
 999
1000         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1001                                         &runtime->audio_tstamp_config);
1002
1003         /* backwards compatible behavior */
1004         if (runtime->audio_tstamp_config.type_requested ==
1005                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1006                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1007                         runtime->audio_tstamp_config.type_requested =
1008                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1009                 else
1010                         runtime->audio_tstamp_config.type_requested =
1011                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1012                 runtime->audio_tstamp_report.valid = 0;
1013         } else
1014                 runtime->audio_tstamp_report.valid = 1;
1015
1016         status->state = runtime->state;
1017         status->suspended_state = runtime->suspended_state;
1018         if (status->state == SNDRV_PCM_STATE_OPEN)
1019                 goto _end;
1020         status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1021         status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1022         if (snd_pcm_running(substream)) {
1023                 snd_pcm_update_hw_ptr(substream);
1024                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1025                         status->tstamp_sec = runtime->status->tstamp.tv_sec;
1026                         status->tstamp_nsec =
1027                                 runtime->status->tstamp.tv_nsec;
1028                         status->driver_tstamp_sec =
1029                                 runtime->driver_tstamp.tv_sec;
1030                         status->driver_tstamp_nsec =
1031                                 runtime->driver_tstamp.tv_nsec;
1032                         status->audio_tstamp_sec =
1033                                 runtime->status->audio_tstamp.tv_sec;
1034                         status->audio_tstamp_nsec =
1035                                 runtime->status->audio_tstamp.tv_nsec;
1036                         if (runtime->audio_tstamp_report.valid == 1)
1037                                 /* backwards compatibility, no report provided in COMPAT mode */
1038                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1039                                                                 &status->audio_tstamp_accuracy,
1040                                                                 &runtime->audio_tstamp_report);
1041
1042                         goto _tstamp_end;
1043                 }
1044         } else {
1045                 /* get tstamp only in fallback mode and only if enabled */
1046                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1047                         struct timespec64 tstamp;
1048
1049                         snd_pcm_gettime(runtime, &tstamp);
1050                         status->tstamp_sec = tstamp.tv_sec;
1051                         status->tstamp_nsec = tstamp.tv_nsec;
1052                 }
1053         }
1054  _tstamp_end:
1055         status->appl_ptr = runtime->control->appl_ptr;
1056         status->hw_ptr = runtime->status->hw_ptr;
1057         status->avail = snd_pcm_avail(substream);
1058         status->delay = snd_pcm_running(substream) ?
1059                 snd_pcm_calc_delay(substream) : 0;
1060         status->avail_max = runtime->avail_max;
1061         status->overrange = runtime->overrange;
1062         runtime->avail_max = 0;
1063         runtime->overrange = 0;
1064  _end:
1065         snd_pcm_stream_unlock_irq(substream);
1066         return 0;
1067 }
1068
1069 static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1070                                  struct snd_pcm_status64 __user * _status,
1071                                  bool ext)
1072 {
1073         struct snd_pcm_status64 status;
1074         int res;
1075
1076         memset(&status, 0, sizeof(status));
1077         /*
1078          * with extension, parameters are read/write,
1079          * get audio_tstamp_data from user,
1080          * ignore rest of status structure
1081          */
1082         if (ext && get_user(status.audio_tstamp_data,
1083                                 (u32 __user *)(&_status->audio_tstamp_data)))
1084                 return -EFAULT;
1085         res = snd_pcm_status64(substream, &status);
1086         if (res < 0)
1087                 return res;
1088         if (copy_to_user(_status, &status, sizeof(status)))
1089                 return -EFAULT;
1090         return 0;
1091 }
1092
1093 static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1094                                  struct snd_pcm_status32 __user * _status,
1095                                  bool ext)
1096 {
1097         struct snd_pcm_status64 status64;
1098         struct snd_pcm_status32 status32;
1099         int res;
1100
1101         memset(&status64, 0, sizeof(status64));
1102         memset(&status32, 0, sizeof(status32));
1103         /*
1104          * with extension, parameters are read/write,
1105          * get audio_tstamp_data from user,
1106          * ignore rest of status structure
1107          */
1108         if (ext && get_user(status64.audio_tstamp_data,
1109                             (u32 __user *)(&_status->audio_tstamp_data)))
1110                 return -EFAULT;
1111         res = snd_pcm_status64(substream, &status64);
1112         if (res < 0)
1113                 return res;
1114
1115         status32 = (struct snd_pcm_status32) {
1116                 .state = status64.state,
1117                 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1118                 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1119                 .tstamp_sec = status64.tstamp_sec,
1120                 .tstamp_nsec = status64.tstamp_nsec,
1121                 .appl_ptr = status64.appl_ptr,
1122                 .hw_ptr = status64.hw_ptr,
1123                 .delay = status64.delay,
1124                 .avail = status64.avail,
1125                 .avail_max = status64.avail_max,
1126                 .overrange = status64.overrange,
1127                 .suspended_state = status64.suspended_state,
1128                 .audio_tstamp_data = status64.audio_tstamp_data,
1129                 .audio_tstamp_sec = status64.audio_tstamp_sec,
1130                 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1131                 .driver_tstamp_sec = status64.audio_tstamp_sec,
1132                 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1133                 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1134         };
1135
1136         if (copy_to_user(_status, &status32, sizeof(status32)))
1137                 return -EFAULT;
1138
1139         return 0;
1140 }
1141
1142 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1143                                 struct snd_pcm_channel_info * info)
1144 {
1145         struct snd_pcm_runtime *runtime;
1146         unsigned int channel;
1147
1148         channel = info->channel;
1149         runtime = substream->runtime;
1150         snd_pcm_stream_lock_irq(substream);
1151         if (runtime->state == SNDRV_PCM_STATE_OPEN) {
1152                 snd_pcm_stream_unlock_irq(substream);
1153                 return -EBADFD;
1154         }
1155         snd_pcm_stream_unlock_irq(substream);
1156         if (channel >= runtime->channels)
1157                 return -EINVAL;
1158         memset(info, 0, sizeof(*info));
1159         info->channel = channel;
1160         return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1161 }
1162
1163 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1164                                      struct snd_pcm_channel_info __user * _info)
1165 {
1166         struct snd_pcm_channel_info info;
1167         int res;
1168
1169         if (copy_from_user(&info, _info, sizeof(info)))
1170                 return -EFAULT;
1171         res = snd_pcm_channel_info(substream, &info);
1172         if (res < 0)
1173                 return res;
1174         if (copy_to_user(_info, &info, sizeof(info)))
1175                 return -EFAULT;
1176         return 0;
1177 }
1178
1179 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1180 {
1181         struct snd_pcm_runtime *runtime = substream->runtime;
1182         if (runtime->trigger_master == NULL)
1183                 return;
1184         if (runtime->trigger_master == substream) {
1185                 if (!runtime->trigger_tstamp_latched)
1186                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1187         } else {
1188                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1189                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1190         }
1191         runtime->trigger_master = NULL;
1192 }
1193
1194 #define ACTION_ARG_IGNORE       (__force snd_pcm_state_t)0
1195
1196 struct action_ops {
1197         int (*pre_action)(struct snd_pcm_substream *substream,
1198                           snd_pcm_state_t state);
1199         int (*do_action)(struct snd_pcm_substream *substream,
1200                          snd_pcm_state_t state);
1201         void (*undo_action)(struct snd_pcm_substream *substream,
1202                             snd_pcm_state_t state);
1203         void (*post_action)(struct snd_pcm_substream *substream,
1204                             snd_pcm_state_t state);
1205 };
1206
1207 /*
1208  *  this functions is core for handling of linked stream
1209  *  Note: the stream state might be changed also on failure
1210  *  Note2: call with calling stream lock + link lock
1211  */
1212 static int snd_pcm_action_group(const struct action_ops *ops,
1213                                 struct snd_pcm_substream *substream,
1214                                 snd_pcm_state_t state,
1215                                 bool stream_lock)
1216 {
1217         struct snd_pcm_substream *s = NULL;
1218         struct snd_pcm_substream *s1;
1219         int res = 0, depth = 1;
1220
1221         snd_pcm_group_for_each_entry(s, substream) {
1222                 if (s != substream) {
1223                         if (!stream_lock)
1224                                 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1225                         else if (s->pcm->nonatomic)
1226                                 mutex_lock_nested(&s->self_group.mutex, depth);
1227                         else
1228                                 spin_lock_nested(&s->self_group.lock, depth);
1229                         depth++;
1230                 }
1231                 res = ops->pre_action(s, state);
1232                 if (res < 0)
1233                         goto _unlock;
1234         }
1235         snd_pcm_group_for_each_entry(s, substream) {
1236                 res = ops->do_action(s, state);
1237                 if (res < 0) {
1238                         if (ops->undo_action) {
1239                                 snd_pcm_group_for_each_entry(s1, substream) {
1240                                         if (s1 == s) /* failed stream */
1241                                                 break;
1242                                         ops->undo_action(s1, state);
1243                                 }
1244                         }
1245                         s = NULL; /* unlock all */
1246                         goto _unlock;
1247                 }
1248         }
1249         snd_pcm_group_for_each_entry(s, substream) {
1250                 ops->post_action(s, state);
1251         }
1252  _unlock:
1253         /* unlock streams */
1254         snd_pcm_group_for_each_entry(s1, substream) {
1255                 if (s1 != substream) {
1256                         if (!stream_lock)
1257                                 mutex_unlock(&s1->runtime->buffer_mutex);
1258                         else if (s1->pcm->nonatomic)
1259                                 mutex_unlock(&s1->self_group.mutex);
1260                         else
1261                                 spin_unlock(&s1->self_group.lock);
1262                 }
1263                 if (s1 == s)    /* end */
1264                         break;
1265         }
1266         return res;
1267 }
1268
1269 /*
1270  *  Note: call with stream lock
1271  */
1272 static int snd_pcm_action_single(const struct action_ops *ops,
1273                                  struct snd_pcm_substream *substream,
1274                                  snd_pcm_state_t state)
1275 {
1276         int res;
1277
1278         res = ops->pre_action(substream, state);
1279         if (res < 0)
1280                 return res;
1281         res = ops->do_action(substream, state);
1282         if (res == 0)
1283                 ops->post_action(substream, state);
1284         else if (ops->undo_action)
1285                 ops->undo_action(substream, state);
1286         return res;
1287 }
1288
1289 static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1290                                  struct snd_pcm_group *new_group)
1291 {
1292         substream->group = new_group;
1293         list_move(&substream->link_list, &new_group->substreams);
1294 }
1295
1296 /*
1297  * Unref and unlock the group, but keep the stream lock;
1298  * when the group becomes empty and no longer referred, destroy itself
1299  */
1300 static void snd_pcm_group_unref(struct snd_pcm_group *group,
1301                                 struct snd_pcm_substream *substream)
1302 {
1303         bool do_free;
1304
1305         if (!group)
1306                 return;
1307         do_free = refcount_dec_and_test(&group->refs);
1308         snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1309         if (do_free)
1310                 kfree(group);
1311 }
1312
1313 /*
1314  * Lock the group inside a stream lock and reference it;
1315  * return the locked group object, or NULL if not linked
1316  */
1317 static struct snd_pcm_group *
1318 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1319 {
1320         bool nonatomic = substream->pcm->nonatomic;
1321         struct snd_pcm_group *group;
1322         bool trylock;
1323
1324         for (;;) {
1325                 if (!snd_pcm_stream_linked(substream))
1326                         return NULL;
1327                 group = substream->group;
1328                 /* block freeing the group object */
1329                 refcount_inc(&group->refs);
1330
1331                 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1332                         spin_trylock(&group->lock);
1333                 if (trylock)
1334                         break; /* OK */
1335
1336                 /* re-lock for avoiding ABBA deadlock */
1337                 snd_pcm_stream_unlock(substream);
1338                 snd_pcm_group_lock(group, nonatomic);
1339                 snd_pcm_stream_lock(substream);
1340
1341                 /* check the group again; the above opens a small race window */
1342                 if (substream->group == group)
1343                         break; /* OK */
1344                 /* group changed, try again */
1345                 snd_pcm_group_unref(group, substream);
1346         }
1347         return group;
1348 }
1349
1350 /*
1351  *  Note: call with stream lock
1352  */
1353 static int snd_pcm_action(const struct action_ops *ops,
1354                           struct snd_pcm_substream *substream,
1355                           snd_pcm_state_t state)
1356 {
1357         struct snd_pcm_group *group;
1358         int res;
1359
1360         group = snd_pcm_stream_group_ref(substream);
1361         if (group)
1362                 res = snd_pcm_action_group(ops, substream, state, true);
1363         else
1364                 res = snd_pcm_action_single(ops, substream, state);
1365         snd_pcm_group_unref(group, substream);
1366         return res;
1367 }
1368
1369 /*
1370  *  Note: don't use any locks before
1371  */
1372 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1373                                    struct snd_pcm_substream *substream,
1374                                    snd_pcm_state_t state)
1375 {
1376         int res;
1377
1378         snd_pcm_stream_lock_irq(substream);
1379         res = snd_pcm_action(ops, substream, state);
1380         snd_pcm_stream_unlock_irq(substream);
1381         return res;
1382 }
1383
1384 /*
1385  */
1386 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1387                                     struct snd_pcm_substream *substream,
1388                                     snd_pcm_state_t state)
1389 {
1390         int res;
1391
1392         /* Guarantee the group members won't change during non-atomic action */
1393         down_read(&snd_pcm_link_rwsem);
1394         res = snd_pcm_buffer_access_lock(substream->runtime);
1395         if (res < 0)
1396                 goto unlock;
1397         if (snd_pcm_stream_linked(substream))
1398                 res = snd_pcm_action_group(ops, substream, state, false);
1399         else
1400                 res = snd_pcm_action_single(ops, substream, state);
1401         snd_pcm_buffer_access_unlock(substream->runtime);
1402  unlock:
1403         up_read(&snd_pcm_link_rwsem);
1404         return res;
1405 }
1406
1407 /*
1408  * start callbacks
1409  */
1410 static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1411                              snd_pcm_state_t state)
1412 {
1413         struct snd_pcm_runtime *runtime = substream->runtime;
1414         if (runtime->state != SNDRV_PCM_STATE_PREPARED)
1415                 return -EBADFD;
1416         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1417             !snd_pcm_playback_data(substream))
1418                 return -EPIPE;
1419         runtime->trigger_tstamp_latched = false;
1420         runtime->trigger_master = substream;
1421         return 0;
1422 }
1423
1424 static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1425                             snd_pcm_state_t state)
1426 {
1427         if (substream->runtime->trigger_master != substream)
1428                 return 0;
1429         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1430 }
1431
1432 static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1433                                snd_pcm_state_t state)
1434 {
1435         if (substream->runtime->trigger_master == substream) {
1436                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1437                 substream->runtime->stop_operating = true;
1438         }
1439 }
1440
1441 static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1442                                snd_pcm_state_t state)
1443 {
1444         struct snd_pcm_runtime *runtime = substream->runtime;
1445         snd_pcm_trigger_tstamp(substream);
1446         runtime->hw_ptr_jiffies = jiffies;
1447         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1448                                                             runtime->rate;
1449         __snd_pcm_set_state(runtime, state);
1450         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1451             runtime->silence_size > 0)
1452                 snd_pcm_playback_silence(substream, ULONG_MAX);
1453         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1454 }
1455
1456 static const struct action_ops snd_pcm_action_start = {
1457         .pre_action = snd_pcm_pre_start,
1458         .do_action = snd_pcm_do_start,
1459         .undo_action = snd_pcm_undo_start,
1460         .post_action = snd_pcm_post_start
1461 };
1462
1463 /**
1464  * snd_pcm_start - start all linked streams
1465  * @substream: the PCM substream instance
1466  *
1467  * Return: Zero if successful, or a negative error code.
1468  * The stream lock must be acquired before calling this function.
1469  */
1470 int snd_pcm_start(struct snd_pcm_substream *substream)
1471 {
1472         return snd_pcm_action(&snd_pcm_action_start, substream,
1473                               SNDRV_PCM_STATE_RUNNING);
1474 }
1475
1476 /* take the stream lock and start the streams */
1477 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1478 {
1479         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1480                                        SNDRV_PCM_STATE_RUNNING);
1481 }
1482
1483 /*
1484  * stop callbacks
1485  */
1486 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1487                             snd_pcm_state_t state)
1488 {
1489         struct snd_pcm_runtime *runtime = substream->runtime;
1490         if (runtime->state == SNDRV_PCM_STATE_OPEN)
1491                 return -EBADFD;
1492         runtime->trigger_master = substream;
1493         return 0;
1494 }
1495
1496 static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1497                            snd_pcm_state_t state)
1498 {
1499         if (substream->runtime->trigger_master == substream &&
1500             snd_pcm_running(substream)) {
1501                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1502                 substream->runtime->stop_operating = true;
1503         }
1504         return 0; /* unconditionally stop all substreams */
1505 }
1506
1507 static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1508                               snd_pcm_state_t state)
1509 {
1510         struct snd_pcm_runtime *runtime = substream->runtime;
1511         if (runtime->state != state) {
1512                 snd_pcm_trigger_tstamp(substream);
1513                 __snd_pcm_set_state(runtime, state);
1514                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1515         }
1516         wake_up(&runtime->sleep);
1517         wake_up(&runtime->tsleep);
1518 }
1519
1520 static const struct action_ops snd_pcm_action_stop = {
1521         .pre_action = snd_pcm_pre_stop,
1522         .do_action = snd_pcm_do_stop,
1523         .post_action = snd_pcm_post_stop
1524 };
1525
1526 /**
1527  * snd_pcm_stop - try to stop all running streams in the substream group
1528  * @substream: the PCM substream instance
1529  * @state: PCM state after stopping the stream
1530  *
1531  * The state of each stream is then changed to the given state unconditionally.
1532  *
1533  * Return: Zero if successful, or a negative error code.
1534  */
1535 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1536 {
1537         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1538 }
1539 EXPORT_SYMBOL(snd_pcm_stop);
1540
1541 /**
1542  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1543  * @substream: the PCM substream
1544  *
1545  * After stopping, the state is changed to SETUP.
1546  * Unlike snd_pcm_stop(), this affects only the given stream.
1547  *
1548  * Return: Zero if successful, or a negative error code.
1549  */
1550 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1551 {
1552         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1553                                      SNDRV_PCM_STATE_SETUP);
1554 }
1555
1556 /**
1557  * snd_pcm_stop_xrun - stop the running streams as XRUN
1558  * @substream: the PCM substream instance
1559  *
1560  * This stops the given running substream (and all linked substreams) as XRUN.
1561  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1562  *
1563  * Return: Zero if successful, or a negative error code.
1564  */
1565 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1566 {
1567         unsigned long flags;
1568
1569         snd_pcm_stream_lock_irqsave(substream, flags);
1570         if (substream->runtime && snd_pcm_running(substream))
1571                 __snd_pcm_xrun(substream);
1572         snd_pcm_stream_unlock_irqrestore(substream, flags);
1573         return 0;
1574 }
1575 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1576
1577 /*
1578  * pause callbacks: pass boolean (to start pause or resume) as state argument
1579  */
1580 #define pause_pushed(state)     (__force bool)(state)
1581
1582 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1583                              snd_pcm_state_t state)
1584 {
1585         struct snd_pcm_runtime *runtime = substream->runtime;
1586         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1587                 return -ENOSYS;
1588         if (pause_pushed(state)) {
1589                 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1590                         return -EBADFD;
1591         } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1592                 return -EBADFD;
1593         runtime->trigger_master = substream;
1594         return 0;
1595 }
1596
1597 static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1598                             snd_pcm_state_t state)
1599 {
1600         if (substream->runtime->trigger_master != substream)
1601                 return 0;
1602         /* some drivers might use hw_ptr to recover from the pause -
1603            update the hw_ptr now */
1604         if (pause_pushed(state))
1605                 snd_pcm_update_hw_ptr(substream);
1606         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1607          * a delta between the current jiffies, this gives a large enough
1608          * delta, effectively to skip the check once.
1609          */
1610         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1611         return substream->ops->trigger(substream,
1612                                        pause_pushed(state) ?
1613                                        SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1614                                        SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1615 }
1616
1617 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1618                                snd_pcm_state_t state)
1619 {
1620         if (substream->runtime->trigger_master == substream)
1621                 substream->ops->trigger(substream,
1622                                         pause_pushed(state) ?
1623                                         SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1624                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1625 }
1626
1627 static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1628                                snd_pcm_state_t state)
1629 {
1630         struct snd_pcm_runtime *runtime = substream->runtime;
1631         snd_pcm_trigger_tstamp(substream);
1632         if (pause_pushed(state)) {
1633                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1634                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1635                 wake_up(&runtime->sleep);
1636                 wake_up(&runtime->tsleep);
1637         } else {
1638                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1639                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1640         }
1641 }
1642
1643 static const struct action_ops snd_pcm_action_pause = {
1644         .pre_action = snd_pcm_pre_pause,
1645         .do_action = snd_pcm_do_pause,
1646         .undo_action = snd_pcm_undo_pause,
1647         .post_action = snd_pcm_post_pause
1648 };
1649
1650 /*
1651  * Push/release the pause for all linked streams.
1652  */
1653 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1654 {
1655         return snd_pcm_action(&snd_pcm_action_pause, substream,
1656                               (__force snd_pcm_state_t)push);
1657 }
1658
1659 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1660                                   bool push)
1661 {
1662         return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1663                                        (__force snd_pcm_state_t)push);
1664 }
1665
1666 #ifdef CONFIG_PM
1667 /* suspend callback: state argument ignored */
1668
1669 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1670                                snd_pcm_state_t state)
1671 {
1672         struct snd_pcm_runtime *runtime = substream->runtime;
1673         switch (runtime->state) {
1674         case SNDRV_PCM_STATE_SUSPENDED:
1675                 return -EBUSY;
1676         /* unresumable PCM state; return -EBUSY for skipping suspend */
1677         case SNDRV_PCM_STATE_OPEN:
1678         case SNDRV_PCM_STATE_SETUP:
1679         case SNDRV_PCM_STATE_DISCONNECTED:
1680                 return -EBUSY;
1681         }
1682         runtime->trigger_master = substream;
1683         return 0;
1684 }
1685
1686 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1687                               snd_pcm_state_t state)
1688 {
1689         struct snd_pcm_runtime *runtime = substream->runtime;
1690         if (runtime->trigger_master != substream)
1691                 return 0;
1692         if (! snd_pcm_running(substream))
1693                 return 0;
1694         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1695         runtime->stop_operating = true;
1696         return 0; /* suspend unconditionally */
1697 }
1698
1699 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1700                                  snd_pcm_state_t state)
1701 {
1702         struct snd_pcm_runtime *runtime = substream->runtime;
1703         snd_pcm_trigger_tstamp(substream);
1704         runtime->suspended_state = runtime->state;
1705         runtime->status->suspended_state = runtime->suspended_state;
1706         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1707         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1708         wake_up(&runtime->sleep);
1709         wake_up(&runtime->tsleep);
1710 }
1711
1712 static const struct action_ops snd_pcm_action_suspend = {
1713         .pre_action = snd_pcm_pre_suspend,
1714         .do_action = snd_pcm_do_suspend,
1715         .post_action = snd_pcm_post_suspend
1716 };
1717
1718 /*
1719  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1720  * @substream: the PCM substream
1721  *
1722  * After this call, all streams are changed to SUSPENDED state.
1723  *
1724  * Return: Zero if successful, or a negative error code.
1725  */
1726 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1727 {
1728         int err;
1729         unsigned long flags;
1730
1731         snd_pcm_stream_lock_irqsave(substream, flags);
1732         err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1733                              ACTION_ARG_IGNORE);
1734         snd_pcm_stream_unlock_irqrestore(substream, flags);
1735         return err;
1736 }
1737
1738 /**
1739  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1740  * @pcm: the PCM instance
1741  *
1742  * After this call, all streams are changed to SUSPENDED state.
1743  *
1744  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1745  */
1746 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1747 {
1748         struct snd_pcm_substream *substream;
1749         int stream, err = 0;
1750
1751         if (! pcm)
1752                 return 0;
1753
1754         for_each_pcm_substream(pcm, stream, substream) {
1755                 /* FIXME: the open/close code should lock this as well */
1756                 if (!substream->runtime)
1757                         continue;
1758
1759                 /*
1760                  * Skip BE dai link PCM's that are internal and may
1761                  * not have their substream ops set.
1762                  */
1763                 if (!substream->ops)
1764                         continue;
1765
1766                 err = snd_pcm_suspend(substream);
1767                 if (err < 0 && err != -EBUSY)
1768                         return err;
1769         }
1770
1771         for_each_pcm_substream(pcm, stream, substream)
1772                 snd_pcm_sync_stop(substream, false);
1773
1774         return 0;
1775 }
1776 EXPORT_SYMBOL(snd_pcm_suspend_all);
1777
1778 /* resume callbacks: state argument ignored */
1779
1780 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1781                               snd_pcm_state_t state)
1782 {
1783         struct snd_pcm_runtime *runtime = substream->runtime;
1784         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1785                 return -ENOSYS;
1786         runtime->trigger_master = substream;
1787         return 0;
1788 }
1789
1790 static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1791                              snd_pcm_state_t state)
1792 {
1793         struct snd_pcm_runtime *runtime = substream->runtime;
1794         if (runtime->trigger_master != substream)
1795                 return 0;
1796         /* DMA not running previously? */
1797         if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1798             (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1799              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1800                 return 0;
1801         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1802 }
1803
1804 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1805                                 snd_pcm_state_t state)
1806 {
1807         if (substream->runtime->trigger_master == substream &&
1808             snd_pcm_running(substream))
1809                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1810 }
1811
1812 static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1813                                 snd_pcm_state_t state)
1814 {
1815         struct snd_pcm_runtime *runtime = substream->runtime;
1816         snd_pcm_trigger_tstamp(substream);
1817         __snd_pcm_set_state(runtime, runtime->suspended_state);
1818         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1819 }
1820
1821 static const struct action_ops snd_pcm_action_resume = {
1822         .pre_action = snd_pcm_pre_resume,
1823         .do_action = snd_pcm_do_resume,
1824         .undo_action = snd_pcm_undo_resume,
1825         .post_action = snd_pcm_post_resume
1826 };
1827
1828 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1829 {
1830         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1831                                        ACTION_ARG_IGNORE);
1832 }
1833
1834 #else
1835
1836 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1837 {
1838         return -ENOSYS;
1839 }
1840
1841 #endif /* CONFIG_PM */
1842
1843 /*
1844  * xrun ioctl
1845  *
1846  * Change the RUNNING stream(s) to XRUN state.
1847  */
1848 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1849 {
1850         struct snd_pcm_runtime *runtime = substream->runtime;
1851         int result;
1852
1853         snd_pcm_stream_lock_irq(substream);
1854         switch (runtime->state) {
1855         case SNDRV_PCM_STATE_XRUN:
1856                 result = 0;     /* already there */
1857                 break;
1858         case SNDRV_PCM_STATE_RUNNING:
1859                 __snd_pcm_xrun(substream);
1860                 result = 0;
1861                 break;
1862         default:
1863                 result = -EBADFD;
1864         }
1865         snd_pcm_stream_unlock_irq(substream);
1866         return result;
1867 }
1868
1869 /*
1870  * reset ioctl
1871  */
1872 /* reset callbacks:  state argument ignored */
1873 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1874                              snd_pcm_state_t state)
1875 {
1876         struct snd_pcm_runtime *runtime = substream->runtime;
1877         switch (runtime->state) {
1878         case SNDRV_PCM_STATE_RUNNING:
1879         case SNDRV_PCM_STATE_PREPARED:
1880         case SNDRV_PCM_STATE_PAUSED:
1881         case SNDRV_PCM_STATE_SUSPENDED:
1882                 return 0;
1883         default:
1884                 return -EBADFD;
1885         }
1886 }
1887
1888 static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1889                             snd_pcm_state_t state)
1890 {
1891         struct snd_pcm_runtime *runtime = substream->runtime;
1892         int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1893         if (err < 0)
1894                 return err;
1895         snd_pcm_stream_lock_irq(substream);
1896         runtime->hw_ptr_base = 0;
1897         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1898                 runtime->status->hw_ptr % runtime->period_size;
1899         runtime->silence_start = runtime->status->hw_ptr;
1900         runtime->silence_filled = 0;
1901         snd_pcm_stream_unlock_irq(substream);
1902         return 0;
1903 }
1904
1905 static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1906                                snd_pcm_state_t state)
1907 {
1908         struct snd_pcm_runtime *runtime = substream->runtime;
1909         snd_pcm_stream_lock_irq(substream);
1910         runtime->control->appl_ptr = runtime->status->hw_ptr;
1911         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1912             runtime->silence_size > 0)
1913                 snd_pcm_playback_silence(substream, ULONG_MAX);
1914         snd_pcm_stream_unlock_irq(substream);
1915 }
1916
1917 static const struct action_ops snd_pcm_action_reset = {
1918         .pre_action = snd_pcm_pre_reset,
1919         .do_action = snd_pcm_do_reset,
1920         .post_action = snd_pcm_post_reset
1921 };
1922
1923 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1924 {
1925         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1926                                         ACTION_ARG_IGNORE);
1927 }
1928
1929 /*
1930  * prepare ioctl
1931  */
1932 /* pass f_flags as state argument */
1933 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1934                                snd_pcm_state_t state)
1935 {
1936         struct snd_pcm_runtime *runtime = substream->runtime;
1937         int f_flags = (__force int)state;
1938
1939         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1940             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1941                 return -EBADFD;
1942         if (snd_pcm_running(substream))
1943                 return -EBUSY;
1944         substream->f_flags = f_flags;
1945         return 0;
1946 }
1947
1948 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1949                               snd_pcm_state_t state)
1950 {
1951         int err;
1952         snd_pcm_sync_stop(substream, true);
1953         err = substream->ops->prepare(substream);
1954         if (err < 0)
1955                 return err;
1956         return snd_pcm_do_reset(substream, state);
1957 }
1958
1959 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1960                                  snd_pcm_state_t state)
1961 {
1962         struct snd_pcm_runtime *runtime = substream->runtime;
1963         runtime->control->appl_ptr = runtime->status->hw_ptr;
1964         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1965 }
1966
1967 static const struct action_ops snd_pcm_action_prepare = {
1968         .pre_action = snd_pcm_pre_prepare,
1969         .do_action = snd_pcm_do_prepare,
1970         .post_action = snd_pcm_post_prepare
1971 };
1972
1973 /**
1974  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1975  * @substream: the PCM substream instance
1976  * @file: file to refer f_flags
1977  *
1978  * Return: Zero if successful, or a negative error code.
1979  */
1980 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1981                            struct file *file)
1982 {
1983         int f_flags;
1984
1985         if (file)
1986                 f_flags = file->f_flags;
1987         else
1988                 f_flags = substream->f_flags;
1989
1990         snd_pcm_stream_lock_irq(substream);
1991         switch (substream->runtime->state) {
1992         case SNDRV_PCM_STATE_PAUSED:
1993                 snd_pcm_pause(substream, false);
1994                 fallthrough;
1995         case SNDRV_PCM_STATE_SUSPENDED:
1996                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1997                 break;
1998         }
1999         snd_pcm_stream_unlock_irq(substream);
2000
2001         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
2002                                         substream,
2003                                         (__force snd_pcm_state_t)f_flags);
2004 }
2005
2006 /*
2007  * drain ioctl
2008  */
2009
2010 /* drain init callbacks: state argument ignored */
2011 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2012                                   snd_pcm_state_t state)
2013 {
2014         struct snd_pcm_runtime *runtime = substream->runtime;
2015         switch (runtime->state) {
2016         case SNDRV_PCM_STATE_OPEN:
2017         case SNDRV_PCM_STATE_DISCONNECTED:
2018         case SNDRV_PCM_STATE_SUSPENDED:
2019                 return -EBADFD;
2020         }
2021         runtime->trigger_master = substream;
2022         return 0;
2023 }
2024
2025 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2026                                  snd_pcm_state_t state)
2027 {
2028         struct snd_pcm_runtime *runtime = substream->runtime;
2029         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2030                 switch (runtime->state) {
2031                 case SNDRV_PCM_STATE_PREPARED:
2032                         /* start playback stream if possible */
2033                         if (! snd_pcm_playback_empty(substream)) {
2034                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2035                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2036                         } else {
2037                                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2038                         }
2039                         break;
2040                 case SNDRV_PCM_STATE_RUNNING:
2041                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2042                         break;
2043                 case SNDRV_PCM_STATE_XRUN:
2044                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2045                         break;
2046                 default:
2047                         break;
2048                 }
2049         } else {
2050                 /* stop running stream */
2051                 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2052                         snd_pcm_state_t new_state;
2053
2054                         new_state = snd_pcm_capture_avail(runtime) > 0 ?
2055                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2056                         snd_pcm_do_stop(substream, new_state);
2057                         snd_pcm_post_stop(substream, new_state);
2058                 }
2059         }
2060
2061         if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2062             runtime->trigger_master == substream &&
2063             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2064                 return substream->ops->trigger(substream,
2065                                                SNDRV_PCM_TRIGGER_DRAIN);
2066
2067         return 0;
2068 }
2069
2070 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2071                                     snd_pcm_state_t state)
2072 {
2073 }
2074
2075 static const struct action_ops snd_pcm_action_drain_init = {
2076         .pre_action = snd_pcm_pre_drain_init,
2077         .do_action = snd_pcm_do_drain_init,
2078         .post_action = snd_pcm_post_drain_init
2079 };
2080
2081 /*
2082  * Drain the stream(s).
2083  * When the substream is linked, sync until the draining of all playback streams
2084  * is finished.
2085  * After this call, all streams are supposed to be either SETUP or DRAINING
2086  * (capture only) state.
2087  */
2088 static int snd_pcm_drain(struct snd_pcm_substream *substream,
2089                          struct file *file)
2090 {
2091         struct snd_card *card;
2092         struct snd_pcm_runtime *runtime;
2093         struct snd_pcm_substream *s;
2094         struct snd_pcm_group *group;
2095         wait_queue_entry_t wait;
2096         int result = 0;
2097         int nonblock = 0;
2098
2099         card = substream->pcm->card;
2100         runtime = substream->runtime;
2101
2102         if (runtime->state == SNDRV_PCM_STATE_OPEN)
2103                 return -EBADFD;
2104
2105         if (file) {
2106                 if (file->f_flags & O_NONBLOCK)
2107                         nonblock = 1;
2108         } else if (substream->f_flags & O_NONBLOCK)
2109                 nonblock = 1;
2110
2111         snd_pcm_stream_lock_irq(substream);
2112         /* resume pause */
2113         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2114                 snd_pcm_pause(substream, false);
2115
2116         /* pre-start/stop - all running streams are changed to DRAINING state */
2117         result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2118                                 ACTION_ARG_IGNORE);
2119         if (result < 0)
2120                 goto unlock;
2121         /* in non-blocking, we don't wait in ioctl but let caller poll */
2122         if (nonblock) {
2123                 result = -EAGAIN;
2124                 goto unlock;
2125         }
2126
2127         for (;;) {
2128                 long tout;
2129                 struct snd_pcm_runtime *to_check;
2130                 if (signal_pending(current)) {
2131                         result = -ERESTARTSYS;
2132                         break;
2133                 }
2134                 /* find a substream to drain */
2135                 to_check = NULL;
2136                 group = snd_pcm_stream_group_ref(substream);
2137                 snd_pcm_group_for_each_entry(s, substream) {
2138                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2139                                 continue;
2140                         runtime = s->runtime;
2141                         if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2142                                 to_check = runtime;
2143                                 break;
2144                         }
2145                 }
2146                 snd_pcm_group_unref(group, substream);
2147                 if (!to_check)
2148                         break; /* all drained */
2149                 init_waitqueue_entry(&wait, current);
2150                 set_current_state(TASK_INTERRUPTIBLE);
2151                 add_wait_queue(&to_check->sleep, &wait);
2152                 snd_pcm_stream_unlock_irq(substream);
2153                 if (runtime->no_period_wakeup)
2154                         tout = MAX_SCHEDULE_TIMEOUT;
2155                 else {
2156                         tout = 10;
2157                         if (runtime->rate) {
2158                                 long t = runtime->period_size * 2 / runtime->rate;
2159                                 tout = max(t, tout);
2160                         }
2161                         tout = msecs_to_jiffies(tout * 1000);
2162                 }
2163                 tout = schedule_timeout(tout);
2164
2165                 snd_pcm_stream_lock_irq(substream);
2166                 group = snd_pcm_stream_group_ref(substream);
2167                 snd_pcm_group_for_each_entry(s, substream) {
2168                         if (s->runtime == to_check) {
2169                                 remove_wait_queue(&to_check->sleep, &wait);
2170                                 break;
2171                         }
2172                 }
2173                 snd_pcm_group_unref(group, substream);
2174
2175                 if (card->shutdown) {
2176                         result = -ENODEV;
2177                         break;
2178                 }
2179                 if (tout == 0) {
2180                         if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2181                                 result = -ESTRPIPE;
2182                         else {
2183                                 dev_dbg(substream->pcm->card->dev,
2184                                         "playback drain error (DMA or IRQ trouble?)\n");
2185                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2186                                 result = -EIO;
2187                         }
2188                         break;
2189                 }
2190         }
2191
2192  unlock:
2193         snd_pcm_stream_unlock_irq(substream);
2194
2195         return result;
2196 }
2197
2198 /*
2199  * drop ioctl
2200  *
2201  * Immediately put all linked substreams into SETUP state.
2202  */
2203 static int snd_pcm_drop(struct snd_pcm_substream *substream)
2204 {
2205         struct snd_pcm_runtime *runtime;
2206         int result = 0;
2207
2208         if (PCM_RUNTIME_CHECK(substream))
2209                 return -ENXIO;
2210         runtime = substream->runtime;
2211
2212         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2213             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2214                 return -EBADFD;
2215
2216         snd_pcm_stream_lock_irq(substream);
2217         /* resume pause */
2218         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2219                 snd_pcm_pause(substream, false);
2220
2221         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2222         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2223         snd_pcm_stream_unlock_irq(substream);
2224
2225         return result;
2226 }
2227
2228
2229 static bool is_pcm_file(struct file *file)
2230 {
2231         struct inode *inode = file_inode(file);
2232         struct snd_pcm *pcm;
2233         unsigned int minor;
2234
2235         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2236                 return false;
2237         minor = iminor(inode);
2238         pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2239         if (!pcm)
2240                 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2241         if (!pcm)
2242                 return false;
2243         snd_card_unref(pcm->card);
2244         return true;
2245 }
2246
2247 /*
2248  * PCM link handling
2249  */
2250 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2251 {
2252         int res = 0;
2253         struct snd_pcm_file *pcm_file;
2254         struct snd_pcm_substream *substream1;
2255         struct snd_pcm_group *group, *target_group;
2256         bool nonatomic = substream->pcm->nonatomic;
2257         struct fd f = fdget(fd);
2258
2259         if (!f.file)
2260                 return -EBADFD;
2261         if (!is_pcm_file(f.file)) {
2262                 res = -EBADFD;
2263                 goto _badf;
2264         }
2265         pcm_file = f.file->private_data;
2266         substream1 = pcm_file->substream;
2267
2268         if (substream == substream1) {
2269                 res = -EINVAL;
2270                 goto _badf;
2271         }
2272
2273         group = kzalloc(sizeof(*group), GFP_KERNEL);
2274         if (!group) {
2275                 res = -ENOMEM;
2276                 goto _nolock;
2277         }
2278         snd_pcm_group_init(group);
2279
2280         down_write(&snd_pcm_link_rwsem);
2281         if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2282             substream->runtime->state != substream1->runtime->state ||
2283             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2284                 res = -EBADFD;
2285                 goto _end;
2286         }
2287         if (snd_pcm_stream_linked(substream1)) {
2288                 res = -EALREADY;
2289                 goto _end;
2290         }
2291
2292         snd_pcm_stream_lock_irq(substream);
2293         if (!snd_pcm_stream_linked(substream)) {
2294                 snd_pcm_group_assign(substream, group);
2295                 group = NULL; /* assigned, don't free this one below */
2296         }
2297         target_group = substream->group;
2298         snd_pcm_stream_unlock_irq(substream);
2299
2300         snd_pcm_group_lock_irq(target_group, nonatomic);
2301         snd_pcm_stream_lock_nested(substream1);
2302         snd_pcm_group_assign(substream1, target_group);
2303         refcount_inc(&target_group->refs);
2304         snd_pcm_stream_unlock(substream1);
2305         snd_pcm_group_unlock_irq(target_group, nonatomic);
2306  _end:
2307         up_write(&snd_pcm_link_rwsem);
2308  _nolock:
2309         kfree(group);
2310  _badf:
2311         fdput(f);
2312         return res;
2313 }
2314
2315 static void relink_to_local(struct snd_pcm_substream *substream)
2316 {
2317         snd_pcm_stream_lock_nested(substream);
2318         snd_pcm_group_assign(substream, &substream->self_group);
2319         snd_pcm_stream_unlock(substream);
2320 }
2321
2322 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2323 {
2324         struct snd_pcm_group *group;
2325         bool nonatomic = substream->pcm->nonatomic;
2326         bool do_free = false;
2327         int res = 0;
2328
2329         down_write(&snd_pcm_link_rwsem);
2330
2331         if (!snd_pcm_stream_linked(substream)) {
2332                 res = -EALREADY;
2333                 goto _end;
2334         }
2335
2336         group = substream->group;
2337         snd_pcm_group_lock_irq(group, nonatomic);
2338
2339         relink_to_local(substream);
2340         refcount_dec(&group->refs);
2341
2342         /* detach the last stream, too */
2343         if (list_is_singular(&group->substreams)) {
2344                 relink_to_local(list_first_entry(&group->substreams,
2345                                                  struct snd_pcm_substream,
2346                                                  link_list));
2347                 do_free = refcount_dec_and_test(&group->refs);
2348         }
2349
2350         snd_pcm_group_unlock_irq(group, nonatomic);
2351         if (do_free)
2352                 kfree(group);
2353
2354        _end:
2355         up_write(&snd_pcm_link_rwsem);
2356         return res;
2357 }
2358
2359 /*
2360  * hw configurator
2361  */
2362 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2363                                struct snd_pcm_hw_rule *rule)
2364 {
2365         struct snd_interval t;
2366         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2367                      hw_param_interval_c(params, rule->deps[1]), &t);
2368         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2369 }
2370
2371 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2372                                struct snd_pcm_hw_rule *rule)
2373 {
2374         struct snd_interval t;
2375         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2376                      hw_param_interval_c(params, rule->deps[1]), &t);
2377         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2378 }
2379
2380 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2381                                    struct snd_pcm_hw_rule *rule)
2382 {
2383         struct snd_interval t;
2384         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2385                          hw_param_interval_c(params, rule->deps[1]),
2386                          (unsigned long) rule->private, &t);
2387         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2388 }
2389
2390 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2391                                    struct snd_pcm_hw_rule *rule)
2392 {
2393         struct snd_interval t;
2394         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2395                          (unsigned long) rule->private,
2396                          hw_param_interval_c(params, rule->deps[1]), &t);
2397         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2398 }
2399
2400 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2401                                   struct snd_pcm_hw_rule *rule)
2402 {
2403         snd_pcm_format_t k;
2404         const struct snd_interval *i =
2405                                 hw_param_interval_c(params, rule->deps[0]);
2406         struct snd_mask m;
2407         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2408         snd_mask_any(&m);
2409         pcm_for_each_format(k) {
2410                 int bits;
2411                 if (!snd_mask_test_format(mask, k))
2412                         continue;
2413                 bits = snd_pcm_format_physical_width(k);
2414                 if (bits <= 0)
2415                         continue; /* ignore invalid formats */
2416                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2417                         snd_mask_reset(&m, (__force unsigned)k);
2418         }
2419         return snd_mask_refine(mask, &m);
2420 }
2421
2422 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2423                                        struct snd_pcm_hw_rule *rule)
2424 {
2425         struct snd_interval t;
2426         snd_pcm_format_t k;
2427
2428         t.min = UINT_MAX;
2429         t.max = 0;
2430         t.openmin = 0;
2431         t.openmax = 0;
2432         pcm_for_each_format(k) {
2433                 int bits;
2434                 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2435                         continue;
2436                 bits = snd_pcm_format_physical_width(k);
2437                 if (bits <= 0)
2438                         continue; /* ignore invalid formats */
2439                 if (t.min > (unsigned)bits)
2440                         t.min = bits;
2441                 if (t.max < (unsigned)bits)
2442                         t.max = bits;
2443         }
2444         t.integer = 1;
2445         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2446 }
2447
2448 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2449 #error "Change this table"
2450 #endif
2451
2452 static const unsigned int rates[] = {
2453         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2454         48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2455 };
2456
2457 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2458         .count = ARRAY_SIZE(rates),
2459         .list = rates,
2460 };
2461
2462 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2463                                 struct snd_pcm_hw_rule *rule)
2464 {
2465         struct snd_pcm_hardware *hw = rule->private;
2466         return snd_interval_list(hw_param_interval(params, rule->var),
2467                                  snd_pcm_known_rates.count,
2468                                  snd_pcm_known_rates.list, hw->rates);
2469 }
2470
2471 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2472                                             struct snd_pcm_hw_rule *rule)
2473 {
2474         struct snd_interval t;
2475         struct snd_pcm_substream *substream = rule->private;
2476         t.min = 0;
2477         t.max = substream->buffer_bytes_max;
2478         t.openmin = 0;
2479         t.openmax = 0;
2480         t.integer = 1;
2481         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2482 }
2483
2484 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2485 {
2486         struct snd_pcm_runtime *runtime = substream->runtime;
2487         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2488         int k, err;
2489
2490         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2491                 snd_mask_any(constrs_mask(constrs, k));
2492         }
2493
2494         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2495                 snd_interval_any(constrs_interval(constrs, k));
2496         }
2497
2498         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2499         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2500         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2501         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2502         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2503
2504         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2505                                    snd_pcm_hw_rule_format, NULL,
2506                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2507         if (err < 0)
2508                 return err;
2509         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2510                                   snd_pcm_hw_rule_sample_bits, NULL,
2511                                   SNDRV_PCM_HW_PARAM_FORMAT,
2512                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2513         if (err < 0)
2514                 return err;
2515         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2516                                   snd_pcm_hw_rule_div, NULL,
2517                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2518         if (err < 0)
2519                 return err;
2520         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2521                                   snd_pcm_hw_rule_mul, NULL,
2522                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2523         if (err < 0)
2524                 return err;
2525         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2526                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2527                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2528         if (err < 0)
2529                 return err;
2530         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2531                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2532                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2533         if (err < 0)
2534                 return err;
2535         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2536                                   snd_pcm_hw_rule_div, NULL,
2537                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2538         if (err < 0)
2539                 return err;
2540         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2541                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2542                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2543         if (err < 0)
2544                 return err;
2545         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2546                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2547                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2548         if (err < 0)
2549                 return err;
2550         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2551                                   snd_pcm_hw_rule_div, NULL,
2552                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2553         if (err < 0)
2554                 return err;
2555         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2556                                   snd_pcm_hw_rule_div, NULL,
2557                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2558         if (err < 0)
2559                 return err;
2560         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2561                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2562                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2563         if (err < 0)
2564                 return err;
2565         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2566                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2567                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2568         if (err < 0)
2569                 return err;
2570         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2571                                   snd_pcm_hw_rule_mul, NULL,
2572                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2573         if (err < 0)
2574                 return err;
2575         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2576                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2577                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2578         if (err < 0)
2579                 return err;
2580         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2581                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2582                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2583         if (err < 0)
2584                 return err;
2585         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2586                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2587                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2588         if (err < 0)
2589                 return err;
2590         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2591                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2592                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2593         if (err < 0)
2594                 return err;
2595         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2596                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2597                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2598         if (err < 0)
2599                 return err;
2600         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2601                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2602                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2603         if (err < 0)
2604                 return err;
2605         return 0;
2606 }
2607
2608 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2609 {
2610         struct snd_pcm_runtime *runtime = substream->runtime;
2611         struct snd_pcm_hardware *hw = &runtime->hw;
2612         int err;
2613         unsigned int mask = 0;
2614
2615         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2616                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2617         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2618                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2619         if (hw_support_mmap(substream)) {
2620                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2621                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2622                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2623                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2624                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2625                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2626         }
2627         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2628         if (err < 0)
2629                 return err;
2630
2631         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2632         if (err < 0)
2633                 return err;
2634
2635         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2636                                          PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2637         if (err < 0)
2638                 return err;
2639
2640         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2641                                            hw->channels_min, hw->channels_max);
2642         if (err < 0)
2643                 return err;
2644
2645         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2646                                            hw->rate_min, hw->rate_max);
2647         if (err < 0)
2648                 return err;
2649
2650         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2651                                            hw->period_bytes_min, hw->period_bytes_max);
2652         if (err < 0)
2653                 return err;
2654
2655         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2656                                            hw->periods_min, hw->periods_max);
2657         if (err < 0)
2658                 return err;
2659
2660         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2661                                            hw->period_bytes_min, hw->buffer_bytes_max);
2662         if (err < 0)
2663                 return err;
2664
2665         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2666                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2667                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2668         if (err < 0)
2669                 return err;
2670
2671         /* FIXME: remove */
2672         if (runtime->dma_bytes) {
2673                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2674                 if (err < 0)
2675                         return err;
2676         }
2677
2678         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2679                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2680                                           snd_pcm_hw_rule_rate, hw,
2681                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2682                 if (err < 0)
2683                         return err;
2684         }
2685
2686         /* FIXME: this belong to lowlevel */
2687         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2688
2689         return 0;
2690 }
2691
2692 static void pcm_release_private(struct snd_pcm_substream *substream)
2693 {
2694         if (snd_pcm_stream_linked(substream))
2695                 snd_pcm_unlink(substream);
2696 }
2697
2698 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2699 {
2700         substream->ref_count--;
2701         if (substream->ref_count > 0)
2702                 return;
2703
2704         snd_pcm_drop(substream);
2705         if (substream->hw_opened) {
2706                 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2707                         do_hw_free(substream);
2708                 substream->ops->close(substream);
2709                 substream->hw_opened = 0;
2710         }
2711         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2712                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2713         if (substream->pcm_release) {
2714                 substream->pcm_release(substream);
2715                 substream->pcm_release = NULL;
2716         }
2717         snd_pcm_detach_substream(substream);
2718 }
2719 EXPORT_SYMBOL(snd_pcm_release_substream);
2720
2721 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2722                            struct file *file,
2723                            struct snd_pcm_substream **rsubstream)
2724 {
2725         struct snd_pcm_substream *substream;
2726         int err;
2727
2728         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2729         if (err < 0)
2730                 return err;
2731         if (substream->ref_count > 1) {
2732                 *rsubstream = substream;
2733                 return 0;
2734         }
2735
2736         err = snd_pcm_hw_constraints_init(substream);
2737         if (err < 0) {
2738                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2739                 goto error;
2740         }
2741
2742         err = substream->ops->open(substream);
2743         if (err < 0)
2744                 goto error;
2745
2746         substream->hw_opened = 1;
2747
2748         err = snd_pcm_hw_constraints_complete(substream);
2749         if (err < 0) {
2750                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2751                 goto error;
2752         }
2753
2754         /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2755          * the DMA buffer requires it
2756          */
2757         if (substream->managed_buffer_alloc &&
2758             substream->dma_buffer.dev.need_sync)
2759                 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2760
2761         *rsubstream = substream;
2762         return 0;
2763
2764  error:
2765         snd_pcm_release_substream(substream);
2766         return err;
2767 }
2768 EXPORT_SYMBOL(snd_pcm_open_substream);
2769
2770 static int snd_pcm_open_file(struct file *file,
2771                              struct snd_pcm *pcm,
2772                              int stream)
2773 {
2774         struct snd_pcm_file *pcm_file;
2775         struct snd_pcm_substream *substream;
2776         int err;
2777
2778         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2779         if (err < 0)
2780                 return err;
2781
2782         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2783         if (pcm_file == NULL) {
2784                 snd_pcm_release_substream(substream);
2785                 return -ENOMEM;
2786         }
2787         pcm_file->substream = substream;
2788         if (substream->ref_count == 1)
2789                 substream->pcm_release = pcm_release_private;
2790         file->private_data = pcm_file;
2791
2792         return 0;
2793 }
2794
2795 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2796 {
2797         struct snd_pcm *pcm;
2798         int err = nonseekable_open(inode, file);
2799         if (err < 0)
2800                 return err;
2801         pcm = snd_lookup_minor_data(iminor(inode),
2802                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2803         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2804         if (pcm)
2805                 snd_card_unref(pcm->card);
2806         return err;
2807 }
2808
2809 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2810 {
2811         struct snd_pcm *pcm;
2812         int err = nonseekable_open(inode, file);
2813         if (err < 0)
2814                 return err;
2815         pcm = snd_lookup_minor_data(iminor(inode),
2816                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2817         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2818         if (pcm)
2819                 snd_card_unref(pcm->card);
2820         return err;
2821 }
2822
2823 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2824 {
2825         int err;
2826         wait_queue_entry_t wait;
2827
2828         if (pcm == NULL) {
2829                 err = -ENODEV;
2830                 goto __error1;
2831         }
2832         err = snd_card_file_add(pcm->card, file);
2833         if (err < 0)
2834                 goto __error1;
2835         if (!try_module_get(pcm->card->module)) {
2836                 err = -EFAULT;
2837                 goto __error2;
2838         }
2839         init_waitqueue_entry(&wait, current);
2840         add_wait_queue(&pcm->open_wait, &wait);
2841         mutex_lock(&pcm->open_mutex);
2842         while (1) {
2843                 err = snd_pcm_open_file(file, pcm, stream);
2844                 if (err >= 0)
2845                         break;
2846                 if (err == -EAGAIN) {
2847                         if (file->f_flags & O_NONBLOCK) {
2848                                 err = -EBUSY;
2849                                 break;
2850                         }
2851                 } else
2852                         break;
2853                 set_current_state(TASK_INTERRUPTIBLE);
2854                 mutex_unlock(&pcm->open_mutex);
2855                 schedule();
2856                 mutex_lock(&pcm->open_mutex);
2857                 if (pcm->card->shutdown) {
2858                         err = -ENODEV;
2859                         break;
2860                 }
2861                 if (signal_pending(current)) {
2862                         err = -ERESTARTSYS;
2863                         break;
2864                 }
2865         }
2866         remove_wait_queue(&pcm->open_wait, &wait);
2867         mutex_unlock(&pcm->open_mutex);
2868         if (err < 0)
2869                 goto __error;
2870         return err;
2871
2872       __error:
2873         module_put(pcm->card->module);
2874       __error2:
2875         snd_card_file_remove(pcm->card, file);
2876       __error1:
2877         return err;
2878 }
2879
2880 static int snd_pcm_release(struct inode *inode, struct file *file)
2881 {
2882         struct snd_pcm *pcm;
2883         struct snd_pcm_substream *substream;
2884         struct snd_pcm_file *pcm_file;
2885
2886         pcm_file = file->private_data;
2887         substream = pcm_file->substream;
2888         if (snd_BUG_ON(!substream))
2889                 return -ENXIO;
2890         pcm = substream->pcm;
2891
2892         /* block until the device gets woken up as it may touch the hardware */
2893         snd_power_wait(pcm->card);
2894
2895         mutex_lock(&pcm->open_mutex);
2896         snd_pcm_release_substream(substream);
2897         kfree(pcm_file);
2898         mutex_unlock(&pcm->open_mutex);
2899         wake_up(&pcm->open_wait);
2900         module_put(pcm->card->module);
2901         snd_card_file_remove(pcm->card, file);
2902         return 0;
2903 }
2904
2905 /* check and update PCM state; return 0 or a negative error
2906  * call this inside PCM lock
2907  */
2908 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2909 {
2910         switch (substream->runtime->state) {
2911         case SNDRV_PCM_STATE_DRAINING:
2912                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2913                         return -EBADFD;
2914                 fallthrough;
2915         case SNDRV_PCM_STATE_RUNNING:
2916                 return snd_pcm_update_hw_ptr(substream);
2917         case SNDRV_PCM_STATE_PREPARED:
2918         case SNDRV_PCM_STATE_PAUSED:
2919                 return 0;
2920         case SNDRV_PCM_STATE_SUSPENDED:
2921                 return -ESTRPIPE;
2922         case SNDRV_PCM_STATE_XRUN:
2923                 return -EPIPE;
2924         default:
2925                 return -EBADFD;
2926         }
2927 }
2928
2929 /* increase the appl_ptr; returns the processed frames or a negative error */
2930 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2931                                           snd_pcm_uframes_t frames,
2932                                            snd_pcm_sframes_t avail)
2933 {
2934         struct snd_pcm_runtime *runtime = substream->runtime;
2935         snd_pcm_sframes_t appl_ptr;
2936         int ret;
2937
2938         if (avail <= 0)
2939                 return 0;
2940         if (frames > (snd_pcm_uframes_t)avail)
2941                 frames = avail;
2942         appl_ptr = runtime->control->appl_ptr + frames;
2943         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2944                 appl_ptr -= runtime->boundary;
2945         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2946         return ret < 0 ? ret : frames;
2947 }
2948
2949 /* decrease the appl_ptr; returns the processed frames or zero for error */
2950 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2951                                          snd_pcm_uframes_t frames,
2952                                          snd_pcm_sframes_t avail)
2953 {
2954         struct snd_pcm_runtime *runtime = substream->runtime;
2955         snd_pcm_sframes_t appl_ptr;
2956         int ret;
2957
2958         if (avail <= 0)
2959                 return 0;
2960         if (frames > (snd_pcm_uframes_t)avail)
2961                 frames = avail;
2962         appl_ptr = runtime->control->appl_ptr - frames;
2963         if (appl_ptr < 0)
2964                 appl_ptr += runtime->boundary;
2965         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2966         /* NOTE: we return zero for errors because PulseAudio gets depressed
2967          * upon receiving an error from rewind ioctl and stops processing
2968          * any longer.  Returning zero means that no rewind is done, so
2969          * it's not absolutely wrong to answer like that.
2970          */
2971         return ret < 0 ? 0 : frames;
2972 }
2973
2974 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2975                                         snd_pcm_uframes_t frames)
2976 {
2977         snd_pcm_sframes_t ret;
2978
2979         if (frames == 0)
2980                 return 0;
2981
2982         snd_pcm_stream_lock_irq(substream);
2983         ret = do_pcm_hwsync(substream);
2984         if (!ret)
2985                 ret = rewind_appl_ptr(substream, frames,
2986                                       snd_pcm_hw_avail(substream));
2987         snd_pcm_stream_unlock_irq(substream);
2988         if (ret >= 0)
2989                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2990         return ret;
2991 }
2992
2993 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2994                                          snd_pcm_uframes_t frames)
2995 {
2996         snd_pcm_sframes_t ret;
2997
2998         if (frames == 0)
2999                 return 0;
3000
3001         snd_pcm_stream_lock_irq(substream);
3002         ret = do_pcm_hwsync(substream);
3003         if (!ret)
3004                 ret = forward_appl_ptr(substream, frames,
3005                                        snd_pcm_avail(substream));
3006         snd_pcm_stream_unlock_irq(substream);
3007         if (ret >= 0)
3008                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3009         return ret;
3010 }
3011
3012 static int snd_pcm_delay(struct snd_pcm_substream *substream,
3013                          snd_pcm_sframes_t *delay)
3014 {
3015         int err;
3016
3017         snd_pcm_stream_lock_irq(substream);
3018         err = do_pcm_hwsync(substream);
3019         if (delay && !err)
3020                 *delay = snd_pcm_calc_delay(substream);
3021         snd_pcm_stream_unlock_irq(substream);
3022         snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3023
3024         return err;
3025 }
3026
3027 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3028 {
3029         return snd_pcm_delay(substream, NULL);
3030 }
3031
3032 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3033                             struct snd_pcm_sync_ptr __user *_sync_ptr)
3034 {
3035         struct snd_pcm_runtime *runtime = substream->runtime;
3036         struct snd_pcm_sync_ptr sync_ptr;
3037         volatile struct snd_pcm_mmap_status *status;
3038         volatile struct snd_pcm_mmap_control *control;
3039         int err;
3040
3041         memset(&sync_ptr, 0, sizeof(sync_ptr));
3042         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3043                 return -EFAULT;
3044         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3045                 return -EFAULT;
3046         status = runtime->status;
3047         control = runtime->control;
3048         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3049                 err = snd_pcm_hwsync(substream);
3050                 if (err < 0)
3051                         return err;
3052         }
3053         snd_pcm_stream_lock_irq(substream);
3054         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3055                 err = pcm_lib_apply_appl_ptr(substream,
3056                                              sync_ptr.c.control.appl_ptr);
3057                 if (err < 0) {
3058                         snd_pcm_stream_unlock_irq(substream);
3059                         return err;
3060                 }
3061         } else {
3062                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3063         }
3064         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3065                 control->avail_min = sync_ptr.c.control.avail_min;
3066         else
3067                 sync_ptr.c.control.avail_min = control->avail_min;
3068         sync_ptr.s.status.state = status->state;
3069         sync_ptr.s.status.hw_ptr = status->hw_ptr;
3070         sync_ptr.s.status.tstamp = status->tstamp;
3071         sync_ptr.s.status.suspended_state = status->suspended_state;
3072         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3073         snd_pcm_stream_unlock_irq(substream);
3074         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3075                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3076         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3077                 return -EFAULT;
3078         return 0;
3079 }
3080
3081 struct snd_pcm_mmap_status32 {
3082         snd_pcm_state_t state;
3083         s32 pad1;
3084         u32 hw_ptr;
3085         s32 tstamp_sec;
3086         s32 tstamp_nsec;
3087         snd_pcm_state_t suspended_state;
3088         s32 audio_tstamp_sec;
3089         s32 audio_tstamp_nsec;
3090 } __attribute__((packed));
3091
3092 struct snd_pcm_mmap_control32 {
3093         u32 appl_ptr;
3094         u32 avail_min;
3095 };
3096
3097 struct snd_pcm_sync_ptr32 {
3098         u32 flags;
3099         union {
3100                 struct snd_pcm_mmap_status32 status;
3101                 unsigned char reserved[64];
3102         } s;
3103         union {
3104                 struct snd_pcm_mmap_control32 control;
3105                 unsigned char reserved[64];
3106         } c;
3107 } __attribute__((packed));
3108
3109 /* recalcuate the boundary within 32bit */
3110 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3111 {
3112         snd_pcm_uframes_t boundary;
3113
3114         if (! runtime->buffer_size)
3115                 return 0;
3116         boundary = runtime->buffer_size;
3117         while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3118                 boundary *= 2;
3119         return boundary;
3120 }
3121
3122 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3123                                          struct snd_pcm_sync_ptr32 __user *src)
3124 {
3125         struct snd_pcm_runtime *runtime = substream->runtime;
3126         volatile struct snd_pcm_mmap_status *status;
3127         volatile struct snd_pcm_mmap_control *control;
3128         u32 sflags;
3129         struct snd_pcm_mmap_control scontrol;
3130         struct snd_pcm_mmap_status sstatus;
3131         snd_pcm_uframes_t boundary;
3132         int err;
3133
3134         if (snd_BUG_ON(!runtime))
3135                 return -EINVAL;
3136
3137         if (get_user(sflags, &src->flags) ||
3138             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3139             get_user(scontrol.avail_min, &src->c.control.avail_min))
3140                 return -EFAULT;
3141         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3142                 err = snd_pcm_hwsync(substream);
3143                 if (err < 0)
3144                         return err;
3145         }
3146         status = runtime->status;
3147         control = runtime->control;
3148         boundary = recalculate_boundary(runtime);
3149         if (! boundary)
3150                 boundary = 0x7fffffff;
3151         snd_pcm_stream_lock_irq(substream);
3152         /* FIXME: we should consider the boundary for the sync from app */
3153         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3154                 err = pcm_lib_apply_appl_ptr(substream,
3155                                 scontrol.appl_ptr);
3156                 if (err < 0) {
3157                         snd_pcm_stream_unlock_irq(substream);
3158                         return err;
3159                 }
3160         } else
3161                 scontrol.appl_ptr = control->appl_ptr % boundary;
3162         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3163                 control->avail_min = scontrol.avail_min;
3164         else
3165                 scontrol.avail_min = control->avail_min;
3166         sstatus.state = status->state;
3167         sstatus.hw_ptr = status->hw_ptr % boundary;
3168         sstatus.tstamp = status->tstamp;
3169         sstatus.suspended_state = status->suspended_state;
3170         sstatus.audio_tstamp = status->audio_tstamp;
3171         snd_pcm_stream_unlock_irq(substream);
3172         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3173                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3174         if (put_user(sstatus.state, &src->s.status.state) ||
3175             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3176             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3177             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3178             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3179             put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3180             put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3181             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3182             put_user(scontrol.avail_min, &src->c.control.avail_min))
3183                 return -EFAULT;
3184
3185         return 0;
3186 }
3187 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3188
3189 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3190 {
3191         struct snd_pcm_runtime *runtime = substream->runtime;
3192         int arg;
3193
3194         if (get_user(arg, _arg))
3195                 return -EFAULT;
3196         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3197                 return -EINVAL;
3198         runtime->tstamp_type = arg;
3199         return 0;
3200 }
3201
3202 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3203                                       struct snd_xferi __user *_xferi)
3204 {
3205         struct snd_xferi xferi;
3206         struct snd_pcm_runtime *runtime = substream->runtime;
3207         snd_pcm_sframes_t result;
3208
3209         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3210                 return -EBADFD;
3211         if (put_user(0, &_xferi->result))
3212                 return -EFAULT;
3213         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3214                 return -EFAULT;
3215         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3216                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3217         else
3218                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3219         if (put_user(result, &_xferi->result))
3220                 return -EFAULT;
3221         return result < 0 ? result : 0;
3222 }
3223
3224 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3225                                       struct snd_xfern __user *_xfern)
3226 {
3227         struct snd_xfern xfern;
3228         struct snd_pcm_runtime *runtime = substream->runtime;
3229         void *bufs;
3230         snd_pcm_sframes_t result;
3231
3232         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3233                 return -EBADFD;
3234         if (runtime->channels > 128)
3235                 return -EINVAL;
3236         if (put_user(0, &_xfern->result))
3237                 return -EFAULT;
3238         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3239                 return -EFAULT;
3240
3241         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3242         if (IS_ERR(bufs))
3243                 return PTR_ERR(bufs);
3244         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3245                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3246         else
3247                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3248         kfree(bufs);
3249         if (put_user(result, &_xfern->result))
3250                 return -EFAULT;
3251         return result < 0 ? result : 0;
3252 }
3253
3254 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3255                                 snd_pcm_uframes_t __user *_frames)
3256 {
3257         snd_pcm_uframes_t frames;
3258         snd_pcm_sframes_t result;
3259
3260         if (get_user(frames, _frames))
3261                 return -EFAULT;
3262         if (put_user(0, _frames))
3263                 return -EFAULT;
3264         result = snd_pcm_rewind(substream, frames);
3265         if (put_user(result, _frames))
3266                 return -EFAULT;
3267         return result < 0 ? result : 0;
3268 }
3269
3270 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3271                                  snd_pcm_uframes_t __user *_frames)
3272 {
3273         snd_pcm_uframes_t frames;
3274         snd_pcm_sframes_t result;
3275
3276         if (get_user(frames, _frames))
3277                 return -EFAULT;
3278         if (put_user(0, _frames))
3279                 return -EFAULT;
3280         result = snd_pcm_forward(substream, frames);
3281         if (put_user(result, _frames))
3282                 return -EFAULT;
3283         return result < 0 ? result : 0;
3284 }
3285
3286 static int snd_pcm_common_ioctl(struct file *file,
3287                                  struct snd_pcm_substream *substream,
3288                                  unsigned int cmd, void __user *arg)
3289 {
3290         struct snd_pcm_file *pcm_file = file->private_data;
3291         int res;
3292
3293         if (PCM_RUNTIME_CHECK(substream))
3294                 return -ENXIO;
3295
3296         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3297                 return -EBADFD;
3298
3299         res = snd_power_wait(substream->pcm->card);
3300         if (res < 0)
3301                 return res;
3302
3303         switch (cmd) {
3304         case SNDRV_PCM_IOCTL_PVERSION:
3305                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3306         case SNDRV_PCM_IOCTL_INFO:
3307                 return snd_pcm_info_user(substream, arg);
3308         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
3309                 return 0;
3310         case SNDRV_PCM_IOCTL_TTSTAMP:
3311                 return snd_pcm_tstamp(substream, arg);
3312         case SNDRV_PCM_IOCTL_USER_PVERSION:
3313                 if (get_user(pcm_file->user_pversion,
3314                              (unsigned int __user *)arg))
3315                         return -EFAULT;
3316                 return 0;
3317         case SNDRV_PCM_IOCTL_HW_REFINE:
3318                 return snd_pcm_hw_refine_user(substream, arg);
3319         case SNDRV_PCM_IOCTL_HW_PARAMS:
3320                 return snd_pcm_hw_params_user(substream, arg);
3321         case SNDRV_PCM_IOCTL_HW_FREE:
3322                 return snd_pcm_hw_free(substream);
3323         case SNDRV_PCM_IOCTL_SW_PARAMS:
3324                 return snd_pcm_sw_params_user(substream, arg);
3325         case SNDRV_PCM_IOCTL_STATUS32:
3326                 return snd_pcm_status_user32(substream, arg, false);
3327         case SNDRV_PCM_IOCTL_STATUS_EXT32:
3328                 return snd_pcm_status_user32(substream, arg, true);
3329         case SNDRV_PCM_IOCTL_STATUS64:
3330                 return snd_pcm_status_user64(substream, arg, false);
3331         case SNDRV_PCM_IOCTL_STATUS_EXT64:
3332                 return snd_pcm_status_user64(substream, arg, true);
3333         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3334                 return snd_pcm_channel_info_user(substream, arg);
3335         case SNDRV_PCM_IOCTL_PREPARE:
3336                 return snd_pcm_prepare(substream, file);
3337         case SNDRV_PCM_IOCTL_RESET:
3338                 return snd_pcm_reset(substream);
3339         case SNDRV_PCM_IOCTL_START:
3340                 return snd_pcm_start_lock_irq(substream);
3341         case SNDRV_PCM_IOCTL_LINK:
3342                 return snd_pcm_link(substream, (int)(unsigned long) arg);
3343         case SNDRV_PCM_IOCTL_UNLINK:
3344                 return snd_pcm_unlink(substream);
3345         case SNDRV_PCM_IOCTL_RESUME:
3346                 return snd_pcm_resume(substream);
3347         case SNDRV_PCM_IOCTL_XRUN:
3348                 return snd_pcm_xrun(substream);
3349         case SNDRV_PCM_IOCTL_HWSYNC:
3350                 return snd_pcm_hwsync(substream);
3351         case SNDRV_PCM_IOCTL_DELAY:
3352         {
3353                 snd_pcm_sframes_t delay = 0;
3354                 snd_pcm_sframes_t __user *res = arg;
3355                 int err;
3356
3357                 err = snd_pcm_delay(substream, &delay);
3358                 if (err)
3359                         return err;
3360                 if (put_user(delay, res))
3361                         return -EFAULT;
3362                 return 0;
3363         }
3364         case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3365                 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3366         case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3367                 return snd_pcm_sync_ptr(substream, arg);
3368 #ifdef CONFIG_SND_SUPPORT_OLD_API
3369         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3370                 return snd_pcm_hw_refine_old_user(substream, arg);
3371         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3372                 return snd_pcm_hw_params_old_user(substream, arg);
3373 #endif
3374         case SNDRV_PCM_IOCTL_DRAIN:
3375                 return snd_pcm_drain(substream, file);
3376         case SNDRV_PCM_IOCTL_DROP:
3377                 return snd_pcm_drop(substream);
3378         case SNDRV_PCM_IOCTL_PAUSE:
3379                 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3380         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3381         case SNDRV_PCM_IOCTL_READI_FRAMES:
3382                 return snd_pcm_xferi_frames_ioctl(substream, arg);
3383         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3384         case SNDRV_PCM_IOCTL_READN_FRAMES:
3385                 return snd_pcm_xfern_frames_ioctl(substream, arg);
3386         case SNDRV_PCM_IOCTL_REWIND:
3387                 return snd_pcm_rewind_ioctl(substream, arg);
3388         case SNDRV_PCM_IOCTL_FORWARD:
3389                 return snd_pcm_forward_ioctl(substream, arg);
3390         }
3391         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3392         return -ENOTTY;
3393 }
3394
3395 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3396                           unsigned long arg)
3397 {
3398         struct snd_pcm_file *pcm_file;
3399
3400         pcm_file = file->private_data;
3401
3402         if (((cmd >> 8) & 0xff) != 'A')
3403                 return -ENOTTY;
3404
3405         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3406                                      (void __user *)arg);
3407 }
3408
3409 /**
3410  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3411  * @substream: PCM substream
3412  * @cmd: IOCTL cmd
3413  * @arg: IOCTL argument
3414  *
3415  * The function is provided primarily for OSS layer and USB gadget drivers,
3416  * and it allows only the limited set of ioctls (hw_params, sw_params,
3417  * prepare, start, drain, drop, forward).
3418  *
3419  * Return: zero if successful, or a negative error code
3420  */
3421 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3422                          unsigned int cmd, void *arg)
3423 {
3424         snd_pcm_uframes_t *frames = arg;
3425         snd_pcm_sframes_t result;
3426
3427         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3428                 return -EBADFD;
3429
3430         switch (cmd) {
3431         case SNDRV_PCM_IOCTL_FORWARD:
3432         {
3433                 /* provided only for OSS; capture-only and no value returned */
3434                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3435                         return -EINVAL;
3436                 result = snd_pcm_forward(substream, *frames);
3437                 return result < 0 ? result : 0;
3438         }
3439         case SNDRV_PCM_IOCTL_HW_PARAMS:
3440                 return snd_pcm_hw_params(substream, arg);
3441         case SNDRV_PCM_IOCTL_SW_PARAMS:
3442                 return snd_pcm_sw_params(substream, arg);
3443         case SNDRV_PCM_IOCTL_PREPARE:
3444                 return snd_pcm_prepare(substream, NULL);
3445         case SNDRV_PCM_IOCTL_START:
3446                 return snd_pcm_start_lock_irq(substream);
3447         case SNDRV_PCM_IOCTL_DRAIN:
3448                 return snd_pcm_drain(substream, NULL);
3449         case SNDRV_PCM_IOCTL_DROP:
3450                 return snd_pcm_drop(substream);
3451         case SNDRV_PCM_IOCTL_DELAY:
3452                 return snd_pcm_delay(substream, frames);
3453         default:
3454                 return -EINVAL;
3455         }
3456 }
3457 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3458
3459 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3460                             loff_t * offset)
3461 {
3462         struct snd_pcm_file *pcm_file;
3463         struct snd_pcm_substream *substream;
3464         struct snd_pcm_runtime *runtime;
3465         snd_pcm_sframes_t result;
3466
3467         pcm_file = file->private_data;
3468         substream = pcm_file->substream;
3469         if (PCM_RUNTIME_CHECK(substream))
3470                 return -ENXIO;
3471         runtime = substream->runtime;
3472         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3473             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3474                 return -EBADFD;
3475         if (!frame_aligned(runtime, count))
3476                 return -EINVAL;
3477         count = bytes_to_frames(runtime, count);
3478         result = snd_pcm_lib_read(substream, buf, count);
3479         if (result > 0)
3480                 result = frames_to_bytes(runtime, result);
3481         return result;
3482 }
3483
3484 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3485                              size_t count, loff_t * offset)
3486 {
3487         struct snd_pcm_file *pcm_file;
3488         struct snd_pcm_substream *substream;
3489         struct snd_pcm_runtime *runtime;
3490         snd_pcm_sframes_t result;
3491
3492         pcm_file = file->private_data;
3493         substream = pcm_file->substream;
3494         if (PCM_RUNTIME_CHECK(substream))
3495                 return -ENXIO;
3496         runtime = substream->runtime;
3497         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3498             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3499                 return -EBADFD;
3500         if (!frame_aligned(runtime, count))
3501                 return -EINVAL;
3502         count = bytes_to_frames(runtime, count);
3503         result = snd_pcm_lib_write(substream, buf, count);
3504         if (result > 0)
3505                 result = frames_to_bytes(runtime, result);
3506         return result;
3507 }
3508
3509 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3510 {
3511         struct snd_pcm_file *pcm_file;
3512         struct snd_pcm_substream *substream;
3513         struct snd_pcm_runtime *runtime;
3514         snd_pcm_sframes_t result;
3515         unsigned long i;
3516         void __user **bufs;
3517         snd_pcm_uframes_t frames;
3518
3519         pcm_file = iocb->ki_filp->private_data;
3520         substream = pcm_file->substream;
3521         if (PCM_RUNTIME_CHECK(substream))
3522                 return -ENXIO;
3523         runtime = substream->runtime;
3524         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3525             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3526                 return -EBADFD;
3527         if (!iter_is_iovec(to))
3528                 return -EINVAL;
3529         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3530                 return -EINVAL;
3531         if (!frame_aligned(runtime, to->iov->iov_len))
3532                 return -EINVAL;
3533         frames = bytes_to_samples(runtime, to->iov->iov_len);
3534         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3535         if (bufs == NULL)
3536                 return -ENOMEM;
3537         for (i = 0; i < to->nr_segs; ++i)
3538                 bufs[i] = to->iov[i].iov_base;
3539         result = snd_pcm_lib_readv(substream, bufs, frames);
3540         if (result > 0)
3541                 result = frames_to_bytes(runtime, result);
3542         kfree(bufs);
3543         return result;
3544 }
3545
3546 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3547 {
3548         struct snd_pcm_file *pcm_file;
3549         struct snd_pcm_substream *substream;
3550         struct snd_pcm_runtime *runtime;
3551         snd_pcm_sframes_t result;
3552         unsigned long i;
3553         void __user **bufs;
3554         snd_pcm_uframes_t frames;
3555
3556         pcm_file = iocb->ki_filp->private_data;
3557         substream = pcm_file->substream;
3558         if (PCM_RUNTIME_CHECK(substream))
3559                 return -ENXIO;
3560         runtime = substream->runtime;
3561         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3562             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3563                 return -EBADFD;
3564         if (!iter_is_iovec(from))
3565                 return -EINVAL;
3566         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3567             !frame_aligned(runtime, from->iov->iov_len))
3568                 return -EINVAL;
3569         frames = bytes_to_samples(runtime, from->iov->iov_len);
3570         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3571         if (bufs == NULL)
3572                 return -ENOMEM;
3573         for (i = 0; i < from->nr_segs; ++i)
3574                 bufs[i] = from->iov[i].iov_base;
3575         result = snd_pcm_lib_writev(substream, bufs, frames);
3576         if (result > 0)
3577                 result = frames_to_bytes(runtime, result);
3578         kfree(bufs);
3579         return result;
3580 }
3581
3582 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3583 {
3584         struct snd_pcm_file *pcm_file;
3585         struct snd_pcm_substream *substream;
3586         struct snd_pcm_runtime *runtime;
3587         __poll_t mask, ok;
3588         snd_pcm_uframes_t avail;
3589
3590         pcm_file = file->private_data;
3591
3592         substream = pcm_file->substream;
3593         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3594                 ok = EPOLLOUT | EPOLLWRNORM;
3595         else
3596                 ok = EPOLLIN | EPOLLRDNORM;
3597         if (PCM_RUNTIME_CHECK(substream))
3598                 return ok | EPOLLERR;
3599
3600         runtime = substream->runtime;
3601         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3602                 return ok | EPOLLERR;
3603
3604         poll_wait(file, &runtime->sleep, wait);
3605
3606         mask = 0;
3607         snd_pcm_stream_lock_irq(substream);
3608         avail = snd_pcm_avail(substream);
3609         switch (runtime->state) {
3610         case SNDRV_PCM_STATE_RUNNING:
3611         case SNDRV_PCM_STATE_PREPARED:
3612         case SNDRV_PCM_STATE_PAUSED:
3613                 if (avail >= runtime->control->avail_min)
3614                         mask = ok;
3615                 break;
3616         case SNDRV_PCM_STATE_DRAINING:
3617                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3618                         mask = ok;
3619                         if (!avail)
3620                                 mask |= EPOLLERR;
3621                 }
3622                 break;
3623         default:
3624                 mask = ok | EPOLLERR;
3625                 break;
3626         }
3627         snd_pcm_stream_unlock_irq(substream);
3628         return mask;
3629 }
3630
3631 /*
3632  * mmap support
3633  */
3634
3635 /*
3636  * Only on coherent architectures, we can mmap the status and the control records
3637  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3638  */
3639 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3640 /*
3641  * mmap status record
3642  */
3643 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3644 {
3645         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3646         struct snd_pcm_runtime *runtime;
3647
3648         if (substream == NULL)
3649                 return VM_FAULT_SIGBUS;
3650         runtime = substream->runtime;
3651         vmf->page = virt_to_page(runtime->status);
3652         get_page(vmf->page);
3653         return 0;
3654 }
3655
3656 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3657 {
3658         .fault =        snd_pcm_mmap_status_fault,
3659 };
3660
3661 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3662                                struct vm_area_struct *area)
3663 {
3664         long size;
3665         if (!(area->vm_flags & VM_READ))
3666                 return -EINVAL;
3667         size = area->vm_end - area->vm_start;
3668         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3669                 return -EINVAL;
3670         area->vm_ops = &snd_pcm_vm_ops_status;
3671         area->vm_private_data = substream;
3672         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3673         area->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
3674         return 0;
3675 }
3676
3677 /*
3678  * mmap control record
3679  */
3680 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3681 {
3682         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3683         struct snd_pcm_runtime *runtime;
3684
3685         if (substream == NULL)
3686                 return VM_FAULT_SIGBUS;
3687         runtime = substream->runtime;
3688         vmf->page = virt_to_page(runtime->control);
3689         get_page(vmf->page);
3690         return 0;
3691 }
3692
3693 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3694 {
3695         .fault =        snd_pcm_mmap_control_fault,
3696 };
3697
3698 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3699                                 struct vm_area_struct *area)
3700 {
3701         long size;
3702         if (!(area->vm_flags & VM_READ))
3703                 return -EINVAL;
3704         size = area->vm_end - area->vm_start;
3705         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3706                 return -EINVAL;
3707         area->vm_ops = &snd_pcm_vm_ops_control;
3708         area->vm_private_data = substream;
3709         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3710         return 0;
3711 }
3712
3713 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3714 {
3715         /* If drivers require the explicit sync (typically for non-coherent
3716          * pages), we have to disable the mmap of status and control data
3717          * to enforce the control via SYNC_PTR ioctl.
3718          */
3719         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3720                 return false;
3721         /* See pcm_control_mmap_allowed() below.
3722          * Since older alsa-lib requires both status and control mmaps to be
3723          * coupled, we have to disable the status mmap for old alsa-lib, too.
3724          */
3725         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3726             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3727                 return false;
3728         return true;
3729 }
3730
3731 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3732 {
3733         if (pcm_file->no_compat_mmap)
3734                 return false;
3735         /* see above */
3736         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3737                 return false;
3738         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3739          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3740          * thus it effectively assures the manual update of appl_ptr.
3741          */
3742         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3743                 return false;
3744         return true;
3745 }
3746
3747 #else /* ! coherent mmap */
3748 /*
3749  * don't support mmap for status and control records.
3750  */
3751 #define pcm_status_mmap_allowed(pcm_file)       false
3752 #define pcm_control_mmap_allowed(pcm_file)      false
3753
3754 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3755                                struct vm_area_struct *area)
3756 {
3757         return -ENXIO;
3758 }
3759 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3760                                 struct vm_area_struct *area)
3761 {
3762         return -ENXIO;
3763 }
3764 #endif /* coherent mmap */
3765
3766 /*
3767  * fault callback for mmapping a RAM page
3768  */
3769 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3770 {
3771         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3772         struct snd_pcm_runtime *runtime;
3773         unsigned long offset;
3774         struct page * page;
3775         size_t dma_bytes;
3776
3777         if (substream == NULL)
3778                 return VM_FAULT_SIGBUS;
3779         runtime = substream->runtime;
3780         offset = vmf->pgoff << PAGE_SHIFT;
3781         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3782         if (offset > dma_bytes - PAGE_SIZE)
3783                 return VM_FAULT_SIGBUS;
3784         if (substream->ops->page)
3785                 page = substream->ops->page(substream, offset);
3786         else if (!snd_pcm_get_dma_buf(substream))
3787                 page = virt_to_page(runtime->dma_area + offset);
3788         else
3789                 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3790         if (!page)
3791                 return VM_FAULT_SIGBUS;
3792         get_page(page);
3793         vmf->page = page;
3794         return 0;
3795 }
3796
3797 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3798         .open =         snd_pcm_mmap_data_open,
3799         .close =        snd_pcm_mmap_data_close,
3800 };
3801
3802 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3803         .open =         snd_pcm_mmap_data_open,
3804         .close =        snd_pcm_mmap_data_close,
3805         .fault =        snd_pcm_mmap_data_fault,
3806 };
3807
3808 /*
3809  * mmap the DMA buffer on RAM
3810  */
3811
3812 /**
3813  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3814  * @substream: PCM substream
3815  * @area: VMA
3816  *
3817  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3818  * this function is invoked implicitly.
3819  *
3820  * Return: zero if successful, or a negative error code
3821  */
3822 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3823                              struct vm_area_struct *area)
3824 {
3825         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3826         if (!substream->ops->page &&
3827             !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3828                 return 0;
3829         /* mmap with fault handler */
3830         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3831         return 0;
3832 }
3833 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3834
3835 /*
3836  * mmap the DMA buffer on I/O memory area
3837  */
3838 #if SNDRV_PCM_INFO_MMAP_IOMEM
3839 /**
3840  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3841  * @substream: PCM substream
3842  * @area: VMA
3843  *
3844  * When your hardware uses the iomapped pages as the hardware buffer and
3845  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3846  * is supposed to work only on limited architectures.
3847  *
3848  * Return: zero if successful, or a negative error code
3849  */
3850 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3851                            struct vm_area_struct *area)
3852 {
3853         struct snd_pcm_runtime *runtime = substream->runtime;
3854
3855         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3856         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3857 }
3858 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3859 #endif /* SNDRV_PCM_INFO_MMAP */
3860
3861 /*
3862  * mmap DMA buffer
3863  */
3864 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3865                       struct vm_area_struct *area)
3866 {
3867         struct snd_pcm_runtime *runtime;
3868         long size;
3869         unsigned long offset;
3870         size_t dma_bytes;
3871         int err;
3872
3873         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3874                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3875                         return -EINVAL;
3876         } else {
3877                 if (!(area->vm_flags & VM_READ))
3878                         return -EINVAL;
3879         }
3880         runtime = substream->runtime;
3881         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3882                 return -EBADFD;
3883         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3884                 return -ENXIO;
3885         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3886             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3887                 return -EINVAL;
3888         size = area->vm_end - area->vm_start;
3889         offset = area->vm_pgoff << PAGE_SHIFT;
3890         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3891         if ((size_t)size > dma_bytes)
3892                 return -EINVAL;
3893         if (offset > dma_bytes - size)
3894                 return -EINVAL;
3895
3896         area->vm_ops = &snd_pcm_vm_ops_data;
3897         area->vm_private_data = substream;
3898         if (substream->ops->mmap)
3899                 err = substream->ops->mmap(substream, area);
3900         else
3901                 err = snd_pcm_lib_default_mmap(substream, area);
3902         if (!err)
3903                 atomic_inc(&substream->mmap_count);
3904         return err;
3905 }
3906 EXPORT_SYMBOL(snd_pcm_mmap_data);
3907
3908 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3909 {
3910         struct snd_pcm_file * pcm_file;
3911         struct snd_pcm_substream *substream;
3912         unsigned long offset;
3913
3914         pcm_file = file->private_data;
3915         substream = pcm_file->substream;
3916         if (PCM_RUNTIME_CHECK(substream))
3917                 return -ENXIO;
3918         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3919                 return -EBADFD;
3920
3921         offset = area->vm_pgoff << PAGE_SHIFT;
3922         switch (offset) {
3923         case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3924                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3925                         return -ENXIO;
3926                 fallthrough;
3927         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3928                 if (!pcm_status_mmap_allowed(pcm_file))
3929                         return -ENXIO;
3930                 return snd_pcm_mmap_status(substream, file, area);
3931         case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3932                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3933                         return -ENXIO;
3934                 fallthrough;
3935         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3936                 if (!pcm_control_mmap_allowed(pcm_file))
3937                         return -ENXIO;
3938                 return snd_pcm_mmap_control(substream, file, area);
3939         default:
3940                 return snd_pcm_mmap_data(substream, file, area);
3941         }
3942         return 0;
3943 }
3944
3945 static int snd_pcm_fasync(int fd, struct file * file, int on)
3946 {
3947         struct snd_pcm_file * pcm_file;
3948         struct snd_pcm_substream *substream;
3949         struct snd_pcm_runtime *runtime;
3950
3951         pcm_file = file->private_data;
3952         substream = pcm_file->substream;
3953         if (PCM_RUNTIME_CHECK(substream))
3954                 return -ENXIO;
3955         runtime = substream->runtime;
3956         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3957                 return -EBADFD;
3958         return snd_fasync_helper(fd, file, on, &runtime->fasync);
3959 }
3960
3961 /*
3962  * ioctl32 compat
3963  */
3964 #ifdef CONFIG_COMPAT
3965 #include "pcm_compat.c"
3966 #else
3967 #define snd_pcm_ioctl_compat    NULL
3968 #endif
3969
3970 /*
3971  *  To be removed helpers to keep binary compatibility
3972  */
3973
3974 #ifdef CONFIG_SND_SUPPORT_OLD_API
3975 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3976 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3977
3978 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3979                                                struct snd_pcm_hw_params_old *oparams)
3980 {
3981         unsigned int i;
3982
3983         memset(params, 0, sizeof(*params));
3984         params->flags = oparams->flags;
3985         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3986                 params->masks[i].bits[0] = oparams->masks[i];
3987         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3988         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3989         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3990         params->info = oparams->info;
3991         params->msbits = oparams->msbits;
3992         params->rate_num = oparams->rate_num;
3993         params->rate_den = oparams->rate_den;
3994         params->fifo_size = oparams->fifo_size;
3995 }
3996
3997 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3998                                              struct snd_pcm_hw_params *params)
3999 {
4000         unsigned int i;
4001
4002         memset(oparams, 0, sizeof(*oparams));
4003         oparams->flags = params->flags;
4004         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4005                 oparams->masks[i] = params->masks[i].bits[0];
4006         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4007         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4008         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4009         oparams->info = params->info;
4010         oparams->msbits = params->msbits;
4011         oparams->rate_num = params->rate_num;
4012         oparams->rate_den = params->rate_den;
4013         oparams->fifo_size = params->fifo_size;
4014 }
4015
4016 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4017                                       struct snd_pcm_hw_params_old __user * _oparams)
4018 {
4019         struct snd_pcm_hw_params *params;
4020         struct snd_pcm_hw_params_old *oparams = NULL;
4021         int err;
4022
4023         params = kmalloc(sizeof(*params), GFP_KERNEL);
4024         if (!params)
4025                 return -ENOMEM;
4026
4027         oparams = memdup_user(_oparams, sizeof(*oparams));
4028         if (IS_ERR(oparams)) {
4029                 err = PTR_ERR(oparams);
4030                 goto out;
4031         }
4032         snd_pcm_hw_convert_from_old_params(params, oparams);
4033         err = snd_pcm_hw_refine(substream, params);
4034         if (err < 0)
4035                 goto out_old;
4036
4037         err = fixup_unreferenced_params(substream, params);
4038         if (err < 0)
4039                 goto out_old;
4040
4041         snd_pcm_hw_convert_to_old_params(oparams, params);
4042         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4043                 err = -EFAULT;
4044 out_old:
4045         kfree(oparams);
4046 out:
4047         kfree(params);
4048         return err;
4049 }
4050
4051 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4052                                       struct snd_pcm_hw_params_old __user * _oparams)
4053 {
4054         struct snd_pcm_hw_params *params;
4055         struct snd_pcm_hw_params_old *oparams = NULL;
4056         int err;
4057
4058         params = kmalloc(sizeof(*params), GFP_KERNEL);
4059         if (!params)
4060                 return -ENOMEM;
4061
4062         oparams = memdup_user(_oparams, sizeof(*oparams));
4063         if (IS_ERR(oparams)) {
4064                 err = PTR_ERR(oparams);
4065                 goto out;
4066         }
4067
4068         snd_pcm_hw_convert_from_old_params(params, oparams);
4069         err = snd_pcm_hw_params(substream, params);
4070         if (err < 0)
4071                 goto out_old;
4072
4073         snd_pcm_hw_convert_to_old_params(oparams, params);
4074         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4075                 err = -EFAULT;
4076 out_old:
4077         kfree(oparams);
4078 out:
4079         kfree(params);
4080         return err;
4081 }
4082 #endif /* CONFIG_SND_SUPPORT_OLD_API */
4083
4084 #ifndef CONFIG_MMU
4085 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4086                                                unsigned long addr,
4087                                                unsigned long len,
4088                                                unsigned long pgoff,
4089                                                unsigned long flags)
4090 {
4091         struct snd_pcm_file *pcm_file = file->private_data;
4092         struct snd_pcm_substream *substream = pcm_file->substream;
4093         struct snd_pcm_runtime *runtime = substream->runtime;
4094         unsigned long offset = pgoff << PAGE_SHIFT;
4095
4096         switch (offset) {
4097         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4098                 return (unsigned long)runtime->status;
4099         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4100                 return (unsigned long)runtime->control;
4101         default:
4102                 return (unsigned long)runtime->dma_area + offset;
4103         }
4104 }
4105 #else
4106 # define snd_pcm_get_unmapped_area NULL
4107 #endif
4108
4109 /*
4110  *  Register section
4111  */
4112
4113 const struct file_operations snd_pcm_f_ops[2] = {
4114         {
4115                 .owner =                THIS_MODULE,
4116                 .write =                snd_pcm_write,
4117                 .write_iter =           snd_pcm_writev,
4118                 .open =                 snd_pcm_playback_open,
4119                 .release =              snd_pcm_release,
4120                 .llseek =               no_llseek,
4121                 .poll =                 snd_pcm_poll,
4122                 .unlocked_ioctl =       snd_pcm_ioctl,
4123                 .compat_ioctl =         snd_pcm_ioctl_compat,
4124                 .mmap =                 snd_pcm_mmap,
4125                 .fasync =               snd_pcm_fasync,
4126                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4127         },
4128         {
4129                 .owner =                THIS_MODULE,
4130                 .read =                 snd_pcm_read,
4131                 .read_iter =            snd_pcm_readv,
4132                 .open =                 snd_pcm_capture_open,
4133                 .release =              snd_pcm_release,
4134                 .llseek =               no_llseek,
4135                 .poll =                 snd_pcm_poll,
4136                 .unlocked_ioctl =       snd_pcm_ioctl,
4137                 .compat_ioctl =         snd_pcm_ioctl_compat,
4138                 .mmap =                 snd_pcm_mmap,
4139                 .fasync =               snd_pcm_fasync,
4140                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4141         }
4142 };