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 __maybe_unused;
 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 __maybe_unused;
 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 __maybe_unused;
 368         struct snd_interval old_interval __maybe_unused;
 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 __maybe_unused;
 652         struct snd_interval old_interval __maybe_unused;
 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) {
 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         int err;
1428
1429         if (substream->runtime->trigger_master != substream)
1430                 return 0;
1431         err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1432         /* XRUN happened during the start */
1433         if (err == -EPIPE)
1434                 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN);
1435         return err;
1436 }
1437
1438 static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1439                                snd_pcm_state_t state)
1440 {
1441         if (substream->runtime->trigger_master == substream) {
1442                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1443                 substream->runtime->stop_operating = true;
1444         }
1445 }
1446
1447 static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1448                                snd_pcm_state_t state)
1449 {
1450         struct snd_pcm_runtime *runtime = substream->runtime;
1451         snd_pcm_trigger_tstamp(substream);
1452         runtime->hw_ptr_jiffies = jiffies;
1453         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1454                                                             runtime->rate;
1455         __snd_pcm_set_state(runtime, state);
1456         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1457             runtime->silence_size > 0)
1458                 snd_pcm_playback_silence(substream, ULONG_MAX);
1459         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1460 }
1461
1462 static const struct action_ops snd_pcm_action_start = {
1463         .pre_action = snd_pcm_pre_start,
1464         .do_action = snd_pcm_do_start,
1465         .undo_action = snd_pcm_undo_start,
1466         .post_action = snd_pcm_post_start
1467 };
1468
1469 /**
1470  * snd_pcm_start - start all linked streams
1471  * @substream: the PCM substream instance
1472  *
1473  * Return: Zero if successful, or a negative error code.
1474  * The stream lock must be acquired before calling this function.
1475  */
1476 int snd_pcm_start(struct snd_pcm_substream *substream)
1477 {
1478         return snd_pcm_action(&snd_pcm_action_start, substream,
1479                               SNDRV_PCM_STATE_RUNNING);
1480 }
1481
1482 /* take the stream lock and start the streams */
1483 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1484 {
1485         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1486                                        SNDRV_PCM_STATE_RUNNING);
1487 }
1488
1489 /*
1490  * stop callbacks
1491  */
1492 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1493                             snd_pcm_state_t state)
1494 {
1495         struct snd_pcm_runtime *runtime = substream->runtime;
1496         if (runtime->state == SNDRV_PCM_STATE_OPEN)
1497                 return -EBADFD;
1498         runtime->trigger_master = substream;
1499         return 0;
1500 }
1501
1502 static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1503                            snd_pcm_state_t state)
1504 {
1505         if (substream->runtime->trigger_master == substream &&
1506             snd_pcm_running(substream)) {
1507                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1508                 substream->runtime->stop_operating = true;
1509         }
1510         return 0; /* unconditionally stop all substreams */
1511 }
1512
1513 static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1514                               snd_pcm_state_t state)
1515 {
1516         struct snd_pcm_runtime *runtime = substream->runtime;
1517         if (runtime->state != state) {
1518                 snd_pcm_trigger_tstamp(substream);
1519                 __snd_pcm_set_state(runtime, state);
1520                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1521         }
1522         wake_up(&runtime->sleep);
1523         wake_up(&runtime->tsleep);
1524 }
1525
1526 static const struct action_ops snd_pcm_action_stop = {
1527         .pre_action = snd_pcm_pre_stop,
1528         .do_action = snd_pcm_do_stop,
1529         .post_action = snd_pcm_post_stop
1530 };
1531
1532 /**
1533  * snd_pcm_stop - try to stop all running streams in the substream group
1534  * @substream: the PCM substream instance
1535  * @state: PCM state after stopping the stream
1536  *
1537  * The state of each stream is then changed to the given state unconditionally.
1538  *
1539  * Return: Zero if successful, or a negative error code.
1540  */
1541 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1542 {
1543         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1544 }
1545 EXPORT_SYMBOL(snd_pcm_stop);
1546
1547 /**
1548  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1549  * @substream: the PCM substream
1550  *
1551  * After stopping, the state is changed to SETUP.
1552  * Unlike snd_pcm_stop(), this affects only the given stream.
1553  *
1554  * Return: Zero if successful, or a negative error code.
1555  */
1556 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1557 {
1558         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1559                                      SNDRV_PCM_STATE_SETUP);
1560 }
1561
1562 /**
1563  * snd_pcm_stop_xrun - stop the running streams as XRUN
1564  * @substream: the PCM substream instance
1565  *
1566  * This stops the given running substream (and all linked substreams) as XRUN.
1567  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1568  *
1569  * Return: Zero if successful, or a negative error code.
1570  */
1571 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1572 {
1573         unsigned long flags;
1574
1575         snd_pcm_stream_lock_irqsave(substream, flags);
1576         if (substream->runtime && snd_pcm_running(substream))
1577                 __snd_pcm_xrun(substream);
1578         snd_pcm_stream_unlock_irqrestore(substream, flags);
1579         return 0;
1580 }
1581 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1582
1583 /*
1584  * pause callbacks: pass boolean (to start pause or resume) as state argument
1585  */
1586 #define pause_pushed(state)     (__force bool)(state)
1587
1588 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1589                              snd_pcm_state_t state)
1590 {
1591         struct snd_pcm_runtime *runtime = substream->runtime;
1592         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1593                 return -ENOSYS;
1594         if (pause_pushed(state)) {
1595                 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1596                         return -EBADFD;
1597         } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1598                 return -EBADFD;
1599         runtime->trigger_master = substream;
1600         return 0;
1601 }
1602
1603 static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1604                             snd_pcm_state_t state)
1605 {
1606         if (substream->runtime->trigger_master != substream)
1607                 return 0;
1608         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1609          * a delta between the current jiffies, this gives a large enough
1610          * delta, effectively to skip the check once.
1611          */
1612         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1613         return substream->ops->trigger(substream,
1614                                        pause_pushed(state) ?
1615                                        SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1616                                        SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1617 }
1618
1619 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1620                                snd_pcm_state_t state)
1621 {
1622         if (substream->runtime->trigger_master == substream)
1623                 substream->ops->trigger(substream,
1624                                         pause_pushed(state) ?
1625                                         SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1626                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1627 }
1628
1629 static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1630                                snd_pcm_state_t state)
1631 {
1632         struct snd_pcm_runtime *runtime = substream->runtime;
1633         snd_pcm_trigger_tstamp(substream);
1634         if (pause_pushed(state)) {
1635                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1636                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1637                 wake_up(&runtime->sleep);
1638                 wake_up(&runtime->tsleep);
1639         } else {
1640                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1641                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1642         }
1643 }
1644
1645 static const struct action_ops snd_pcm_action_pause = {
1646         .pre_action = snd_pcm_pre_pause,
1647         .do_action = snd_pcm_do_pause,
1648         .undo_action = snd_pcm_undo_pause,
1649         .post_action = snd_pcm_post_pause
1650 };
1651
1652 /*
1653  * Push/release the pause for all linked streams.
1654  */
1655 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1656 {
1657         return snd_pcm_action(&snd_pcm_action_pause, substream,
1658                               (__force snd_pcm_state_t)push);
1659 }
1660
1661 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1662                                   bool push)
1663 {
1664         return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1665                                        (__force snd_pcm_state_t)push);
1666 }
1667
1668 #ifdef CONFIG_PM
1669 /* suspend callback: state argument ignored */
1670
1671 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1672                                snd_pcm_state_t state)
1673 {
1674         struct snd_pcm_runtime *runtime = substream->runtime;
1675         switch (runtime->state) {
1676         case SNDRV_PCM_STATE_SUSPENDED:
1677                 return -EBUSY;
1678         /* unresumable PCM state; return -EBUSY for skipping suspend */
1679         case SNDRV_PCM_STATE_OPEN:
1680         case SNDRV_PCM_STATE_SETUP:
1681         case SNDRV_PCM_STATE_DISCONNECTED:
1682                 return -EBUSY;
1683         }
1684         runtime->trigger_master = substream;
1685         return 0;
1686 }
1687
1688 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1689                               snd_pcm_state_t state)
1690 {
1691         struct snd_pcm_runtime *runtime = substream->runtime;
1692         if (runtime->trigger_master != substream)
1693                 return 0;
1694         if (! snd_pcm_running(substream))
1695                 return 0;
1696         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1697         runtime->stop_operating = true;
1698         return 0; /* suspend unconditionally */
1699 }
1700
1701 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1702                                  snd_pcm_state_t state)
1703 {
1704         struct snd_pcm_runtime *runtime = substream->runtime;
1705         snd_pcm_trigger_tstamp(substream);
1706         runtime->suspended_state = runtime->state;
1707         runtime->status->suspended_state = runtime->suspended_state;
1708         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1709         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1710         wake_up(&runtime->sleep);
1711         wake_up(&runtime->tsleep);
1712 }
1713
1714 static const struct action_ops snd_pcm_action_suspend = {
1715         .pre_action = snd_pcm_pre_suspend,
1716         .do_action = snd_pcm_do_suspend,
1717         .post_action = snd_pcm_post_suspend
1718 };
1719
1720 /*
1721  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1722  * @substream: the PCM substream
1723  *
1724  * After this call, all streams are changed to SUSPENDED state.
1725  *
1726  * Return: Zero if successful, or a negative error code.
1727  */
1728 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1729 {
1730         int err;
1731         unsigned long flags;
1732
1733         snd_pcm_stream_lock_irqsave(substream, flags);
1734         err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1735                              ACTION_ARG_IGNORE);
1736         snd_pcm_stream_unlock_irqrestore(substream, flags);
1737         return err;
1738 }
1739
1740 /**
1741  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1742  * @pcm: the PCM instance
1743  *
1744  * After this call, all streams are changed to SUSPENDED state.
1745  *
1746  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1747  */
1748 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1749 {
1750         struct snd_pcm_substream *substream;
1751         int stream, err = 0;
1752
1753         if (! pcm)
1754                 return 0;
1755
1756         for_each_pcm_substream(pcm, stream, substream) {
1757                 /* FIXME: the open/close code should lock this as well */
1758                 if (!substream->runtime)
1759                         continue;
1760
1761                 /*
1762                  * Skip BE dai link PCM's that are internal and may
1763                  * not have their substream ops set.
1764                  */
1765                 if (!substream->ops)
1766                         continue;
1767
1768                 err = snd_pcm_suspend(substream);
1769                 if (err < 0 && err != -EBUSY)
1770                         return err;
1771         }
1772
1773         for_each_pcm_substream(pcm, stream, substream)
1774                 snd_pcm_sync_stop(substream, false);
1775
1776         return 0;
1777 }
1778 EXPORT_SYMBOL(snd_pcm_suspend_all);
1779
1780 /* resume callbacks: state argument ignored */
1781
1782 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1783                               snd_pcm_state_t state)
1784 {
1785         struct snd_pcm_runtime *runtime = substream->runtime;
1786         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1787                 return -ENOSYS;
1788         runtime->trigger_master = substream;
1789         return 0;
1790 }
1791
1792 static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1793                              snd_pcm_state_t state)
1794 {
1795         struct snd_pcm_runtime *runtime = substream->runtime;
1796         if (runtime->trigger_master != substream)
1797                 return 0;
1798         /* DMA not running previously? */
1799         if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1800             (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1801              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1802                 return 0;
1803         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1804 }
1805
1806 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1807                                 snd_pcm_state_t state)
1808 {
1809         if (substream->runtime->trigger_master == substream &&
1810             snd_pcm_running(substream))
1811                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1812 }
1813
1814 static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1815                                 snd_pcm_state_t state)
1816 {
1817         struct snd_pcm_runtime *runtime = substream->runtime;
1818         snd_pcm_trigger_tstamp(substream);
1819         __snd_pcm_set_state(runtime, runtime->suspended_state);
1820         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1821 }
1822
1823 static const struct action_ops snd_pcm_action_resume = {
1824         .pre_action = snd_pcm_pre_resume,
1825         .do_action = snd_pcm_do_resume,
1826         .undo_action = snd_pcm_undo_resume,
1827         .post_action = snd_pcm_post_resume
1828 };
1829
1830 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1831 {
1832         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1833                                        ACTION_ARG_IGNORE);
1834 }
1835
1836 #else
1837
1838 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1839 {
1840         return -ENOSYS;
1841 }
1842
1843 #endif /* CONFIG_PM */
1844
1845 /*
1846  * xrun ioctl
1847  *
1848  * Change the RUNNING stream(s) to XRUN state.
1849  */
1850 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1851 {
1852         struct snd_pcm_runtime *runtime = substream->runtime;
1853         int result;
1854
1855         snd_pcm_stream_lock_irq(substream);
1856         switch (runtime->state) {
1857         case SNDRV_PCM_STATE_XRUN:
1858                 result = 0;     /* already there */
1859                 break;
1860         case SNDRV_PCM_STATE_RUNNING:
1861                 __snd_pcm_xrun(substream);
1862                 result = 0;
1863                 break;
1864         default:
1865                 result = -EBADFD;
1866         }
1867         snd_pcm_stream_unlock_irq(substream);
1868         return result;
1869 }
1870
1871 /*
1872  * reset ioctl
1873  */
1874 /* reset callbacks:  state argument ignored */
1875 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1876                              snd_pcm_state_t state)
1877 {
1878         struct snd_pcm_runtime *runtime = substream->runtime;
1879         switch (runtime->state) {
1880         case SNDRV_PCM_STATE_RUNNING:
1881         case SNDRV_PCM_STATE_PREPARED:
1882         case SNDRV_PCM_STATE_PAUSED:
1883         case SNDRV_PCM_STATE_SUSPENDED:
1884                 return 0;
1885         default:
1886                 return -EBADFD;
1887         }
1888 }
1889
1890 static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1891                             snd_pcm_state_t state)
1892 {
1893         struct snd_pcm_runtime *runtime = substream->runtime;
1894         int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1895         if (err < 0)
1896                 return err;
1897         snd_pcm_stream_lock_irq(substream);
1898         runtime->hw_ptr_base = 0;
1899         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1900                 runtime->status->hw_ptr % runtime->period_size;
1901         runtime->silence_start = runtime->status->hw_ptr;
1902         runtime->silence_filled = 0;
1903         snd_pcm_stream_unlock_irq(substream);
1904         return 0;
1905 }
1906
1907 static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1908                                snd_pcm_state_t state)
1909 {
1910         struct snd_pcm_runtime *runtime = substream->runtime;
1911         snd_pcm_stream_lock_irq(substream);
1912         runtime->control->appl_ptr = runtime->status->hw_ptr;
1913         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1914             runtime->silence_size > 0)
1915                 snd_pcm_playback_silence(substream, ULONG_MAX);
1916         snd_pcm_stream_unlock_irq(substream);
1917 }
1918
1919 static const struct action_ops snd_pcm_action_reset = {
1920         .pre_action = snd_pcm_pre_reset,
1921         .do_action = snd_pcm_do_reset,
1922         .post_action = snd_pcm_post_reset
1923 };
1924
1925 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1926 {
1927         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1928                                         ACTION_ARG_IGNORE);
1929 }
1930
1931 /*
1932  * prepare ioctl
1933  */
1934 /* pass f_flags as state argument */
1935 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1936                                snd_pcm_state_t state)
1937 {
1938         struct snd_pcm_runtime *runtime = substream->runtime;
1939         int f_flags = (__force int)state;
1940
1941         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1942             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1943                 return -EBADFD;
1944         if (snd_pcm_running(substream))
1945                 return -EBUSY;
1946         substream->f_flags = f_flags;
1947         return 0;
1948 }
1949
1950 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1951                               snd_pcm_state_t state)
1952 {
1953         int err;
1954         snd_pcm_sync_stop(substream, true);
1955         err = substream->ops->prepare(substream);
1956         if (err < 0)
1957                 return err;
1958         return snd_pcm_do_reset(substream, state);
1959 }
1960
1961 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1962                                  snd_pcm_state_t state)
1963 {
1964         struct snd_pcm_runtime *runtime = substream->runtime;
1965         runtime->control->appl_ptr = runtime->status->hw_ptr;
1966         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1967 }
1968
1969 static const struct action_ops snd_pcm_action_prepare = {
1970         .pre_action = snd_pcm_pre_prepare,
1971         .do_action = snd_pcm_do_prepare,
1972         .post_action = snd_pcm_post_prepare
1973 };
1974
1975 /**
1976  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1977  * @substream: the PCM substream instance
1978  * @file: file to refer f_flags
1979  *
1980  * Return: Zero if successful, or a negative error code.
1981  */
1982 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1983                            struct file *file)
1984 {
1985         int f_flags;
1986
1987         if (file)
1988                 f_flags = file->f_flags;
1989         else
1990                 f_flags = substream->f_flags;
1991
1992         snd_pcm_stream_lock_irq(substream);
1993         switch (substream->runtime->state) {
1994         case SNDRV_PCM_STATE_PAUSED:
1995                 snd_pcm_pause(substream, false);
1996                 fallthrough;
1997         case SNDRV_PCM_STATE_SUSPENDED:
1998                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1999                 break;
2000         }
2001         snd_pcm_stream_unlock_irq(substream);
2002
2003         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
2004                                         substream,
2005                                         (__force snd_pcm_state_t)f_flags);
2006 }
2007
2008 /*
2009  * drain ioctl
2010  */
2011
2012 /* drain init callbacks: state argument ignored */
2013 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2014                                   snd_pcm_state_t state)
2015 {
2016         struct snd_pcm_runtime *runtime = substream->runtime;
2017         switch (runtime->state) {
2018         case SNDRV_PCM_STATE_OPEN:
2019         case SNDRV_PCM_STATE_DISCONNECTED:
2020         case SNDRV_PCM_STATE_SUSPENDED:
2021                 return -EBADFD;
2022         }
2023         runtime->trigger_master = substream;
2024         return 0;
2025 }
2026
2027 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2028                                  snd_pcm_state_t state)
2029 {
2030         struct snd_pcm_runtime *runtime = substream->runtime;
2031         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2032                 switch (runtime->state) {
2033                 case SNDRV_PCM_STATE_PREPARED:
2034                         /* start playback stream if possible */
2035                         if (! snd_pcm_playback_empty(substream)) {
2036                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2037                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2038                         } else {
2039                                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2040                         }
2041                         break;
2042                 case SNDRV_PCM_STATE_RUNNING:
2043                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2044                         break;
2045                 case SNDRV_PCM_STATE_XRUN:
2046                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2047                         break;
2048                 default:
2049                         break;
2050                 }
2051         } else {
2052                 /* stop running stream */
2053                 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2054                         snd_pcm_state_t new_state;
2055
2056                         new_state = snd_pcm_capture_avail(runtime) > 0 ?
2057                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2058                         snd_pcm_do_stop(substream, new_state);
2059                         snd_pcm_post_stop(substream, new_state);
2060                 }
2061         }
2062
2063         if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2064             runtime->trigger_master == substream &&
2065             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2066                 return substream->ops->trigger(substream,
2067                                                SNDRV_PCM_TRIGGER_DRAIN);
2068
2069         return 0;
2070 }
2071
2072 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2073                                     snd_pcm_state_t state)
2074 {
2075 }
2076
2077 static const struct action_ops snd_pcm_action_drain_init = {
2078         .pre_action = snd_pcm_pre_drain_init,
2079         .do_action = snd_pcm_do_drain_init,
2080         .post_action = snd_pcm_post_drain_init
2081 };
2082
2083 /*
2084  * Drain the stream(s).
2085  * When the substream is linked, sync until the draining of all playback streams
2086  * is finished.
2087  * After this call, all streams are supposed to be either SETUP or DRAINING
2088  * (capture only) state.
2089  */
2090 static int snd_pcm_drain(struct snd_pcm_substream *substream,
2091                          struct file *file)
2092 {
2093         struct snd_card *card;
2094         struct snd_pcm_runtime *runtime;
2095         struct snd_pcm_substream *s;
2096         struct snd_pcm_group *group;
2097         wait_queue_entry_t wait;
2098         int result = 0;
2099         int nonblock = 0;
2100
2101         card = substream->pcm->card;
2102         runtime = substream->runtime;
2103
2104         if (runtime->state == SNDRV_PCM_STATE_OPEN)
2105                 return -EBADFD;
2106
2107         if (file) {
2108                 if (file->f_flags & O_NONBLOCK)
2109                         nonblock = 1;
2110         } else if (substream->f_flags & O_NONBLOCK)
2111                 nonblock = 1;
2112
2113         snd_pcm_stream_lock_irq(substream);
2114         /* resume pause */
2115         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2116                 snd_pcm_pause(substream, false);
2117
2118         /* pre-start/stop - all running streams are changed to DRAINING state */
2119         result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2120                                 ACTION_ARG_IGNORE);
2121         if (result < 0)
2122                 goto unlock;
2123         /* in non-blocking, we don't wait in ioctl but let caller poll */
2124         if (nonblock) {
2125                 result = -EAGAIN;
2126                 goto unlock;
2127         }
2128
2129         for (;;) {
2130                 long tout;
2131                 struct snd_pcm_runtime *to_check;
2132                 if (signal_pending(current)) {
2133                         result = -ERESTARTSYS;
2134                         break;
2135                 }
2136                 /* find a substream to drain */
2137                 to_check = NULL;
2138                 group = snd_pcm_stream_group_ref(substream);
2139                 snd_pcm_group_for_each_entry(s, substream) {
2140                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2141                                 continue;
2142                         runtime = s->runtime;
2143                         if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2144                                 to_check = runtime;
2145                                 break;
2146                         }
2147                 }
2148                 snd_pcm_group_unref(group, substream);
2149                 if (!to_check)
2150                         break; /* all drained */
2151                 init_waitqueue_entry(&wait, current);
2152                 set_current_state(TASK_INTERRUPTIBLE);
2153                 add_wait_queue(&to_check->sleep, &wait);
2154                 snd_pcm_stream_unlock_irq(substream);
2155                 if (runtime->no_period_wakeup)
2156                         tout = MAX_SCHEDULE_TIMEOUT;
2157                 else {
2158                         tout = 100;
2159                         if (runtime->rate) {
2160                                 long t = runtime->buffer_size * 1100 / runtime->rate;
2161                                 tout = max(t, tout);
2162                         }
2163                         tout = msecs_to_jiffies(tout);
2164                 }
2165                 tout = schedule_timeout(tout);
2166
2167                 snd_pcm_stream_lock_irq(substream);
2168                 group = snd_pcm_stream_group_ref(substream);
2169                 snd_pcm_group_for_each_entry(s, substream) {
2170                         if (s->runtime == to_check) {
2171                                 remove_wait_queue(&to_check->sleep, &wait);
2172                                 break;
2173                         }
2174                 }
2175                 snd_pcm_group_unref(group, substream);
2176
2177                 if (card->shutdown) {
2178                         result = -ENODEV;
2179                         break;
2180                 }
2181                 if (tout == 0) {
2182                         if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2183                                 result = -ESTRPIPE;
2184                         else {
2185                                 dev_dbg(substream->pcm->card->dev,
2186                                         "playback drain timeout (DMA or IRQ trouble?)\n");
2187                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2188                                 result = -EIO;
2189                         }
2190                         break;
2191                 }
2192         }
2193
2194  unlock:
2195         snd_pcm_stream_unlock_irq(substream);
2196
2197         return result;
2198 }
2199
2200 /*
2201  * drop ioctl
2202  *
2203  * Immediately put all linked substreams into SETUP state.
2204  */
2205 static int snd_pcm_drop(struct snd_pcm_substream *substream)
2206 {
2207         struct snd_pcm_runtime *runtime;
2208         int result = 0;
2209
2210         if (PCM_RUNTIME_CHECK(substream))
2211                 return -ENXIO;
2212         runtime = substream->runtime;
2213
2214         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2215             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2216                 return -EBADFD;
2217
2218         snd_pcm_stream_lock_irq(substream);
2219         /* resume pause */
2220         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2221                 snd_pcm_pause(substream, false);
2222
2223         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2224         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2225         snd_pcm_stream_unlock_irq(substream);
2226
2227         return result;
2228 }
2229
2230
2231 static bool is_pcm_file(struct file *file)
2232 {
2233         struct inode *inode = file_inode(file);
2234         struct snd_pcm *pcm;
2235         unsigned int minor;
2236
2237         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2238                 return false;
2239         minor = iminor(inode);
2240         pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2241         if (!pcm)
2242                 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2243         if (!pcm)
2244                 return false;
2245         snd_card_unref(pcm->card);
2246         return true;
2247 }
2248
2249 /*
2250  * PCM link handling
2251  */
2252 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2253 {
2254         int res = 0;
2255         struct snd_pcm_file *pcm_file;
2256         struct snd_pcm_substream *substream1;
2257         struct snd_pcm_group *group, *target_group;
2258         bool nonatomic = substream->pcm->nonatomic;
2259         struct fd f = fdget(fd);
2260
2261         if (!f.file)
2262                 return -EBADFD;
2263         if (!is_pcm_file(f.file)) {
2264                 res = -EBADFD;
2265                 goto _badf;
2266         }
2267         pcm_file = f.file->private_data;
2268         substream1 = pcm_file->substream;
2269
2270         if (substream == substream1) {
2271                 res = -EINVAL;
2272                 goto _badf;
2273         }
2274
2275         group = kzalloc(sizeof(*group), GFP_KERNEL);
2276         if (!group) {
2277                 res = -ENOMEM;
2278                 goto _nolock;
2279         }
2280         snd_pcm_group_init(group);
2281
2282         down_write(&snd_pcm_link_rwsem);
2283         if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2284             substream->runtime->state != substream1->runtime->state ||
2285             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2286                 res = -EBADFD;
2287                 goto _end;
2288         }
2289         if (snd_pcm_stream_linked(substream1)) {
2290                 res = -EALREADY;
2291                 goto _end;
2292         }
2293
2294         snd_pcm_stream_lock_irq(substream);
2295         if (!snd_pcm_stream_linked(substream)) {
2296                 snd_pcm_group_assign(substream, group);
2297                 group = NULL; /* assigned, don't free this one below */
2298         }
2299         target_group = substream->group;
2300         snd_pcm_stream_unlock_irq(substream);
2301
2302         snd_pcm_group_lock_irq(target_group, nonatomic);
2303         snd_pcm_stream_lock_nested(substream1);
2304         snd_pcm_group_assign(substream1, target_group);
2305         refcount_inc(&target_group->refs);
2306         snd_pcm_stream_unlock(substream1);
2307         snd_pcm_group_unlock_irq(target_group, nonatomic);
2308  _end:
2309         up_write(&snd_pcm_link_rwsem);
2310  _nolock:
2311         kfree(group);
2312  _badf:
2313         fdput(f);
2314         return res;
2315 }
2316
2317 static void relink_to_local(struct snd_pcm_substream *substream)
2318 {
2319         snd_pcm_stream_lock_nested(substream);
2320         snd_pcm_group_assign(substream, &substream->self_group);
2321         snd_pcm_stream_unlock(substream);
2322 }
2323
2324 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2325 {
2326         struct snd_pcm_group *group;
2327         bool nonatomic = substream->pcm->nonatomic;
2328         bool do_free = false;
2329         int res = 0;
2330
2331         down_write(&snd_pcm_link_rwsem);
2332
2333         if (!snd_pcm_stream_linked(substream)) {
2334                 res = -EALREADY;
2335                 goto _end;
2336         }
2337
2338         group = substream->group;
2339         snd_pcm_group_lock_irq(group, nonatomic);
2340
2341         relink_to_local(substream);
2342         refcount_dec(&group->refs);
2343
2344         /* detach the last stream, too */
2345         if (list_is_singular(&group->substreams)) {
2346                 relink_to_local(list_first_entry(&group->substreams,
2347                                                  struct snd_pcm_substream,
2348                                                  link_list));
2349                 do_free = refcount_dec_and_test(&group->refs);
2350         }
2351
2352         snd_pcm_group_unlock_irq(group, nonatomic);
2353         if (do_free)
2354                 kfree(group);
2355
2356        _end:
2357         up_write(&snd_pcm_link_rwsem);
2358         return res;
2359 }
2360
2361 /*
2362  * hw configurator
2363  */
2364 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2365                                struct snd_pcm_hw_rule *rule)
2366 {
2367         struct snd_interval t;
2368         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2369                      hw_param_interval_c(params, rule->deps[1]), &t);
2370         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2371 }
2372
2373 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2374                                struct snd_pcm_hw_rule *rule)
2375 {
2376         struct snd_interval t;
2377         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2378                      hw_param_interval_c(params, rule->deps[1]), &t);
2379         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2380 }
2381
2382 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2383                                    struct snd_pcm_hw_rule *rule)
2384 {
2385         struct snd_interval t;
2386         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2387                          hw_param_interval_c(params, rule->deps[1]),
2388                          (unsigned long) rule->private, &t);
2389         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2390 }
2391
2392 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2393                                    struct snd_pcm_hw_rule *rule)
2394 {
2395         struct snd_interval t;
2396         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2397                          (unsigned long) rule->private,
2398                          hw_param_interval_c(params, rule->deps[1]), &t);
2399         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2400 }
2401
2402 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2403                                   struct snd_pcm_hw_rule *rule)
2404 {
2405         snd_pcm_format_t k;
2406         const struct snd_interval *i =
2407                                 hw_param_interval_c(params, rule->deps[0]);
2408         struct snd_mask m;
2409         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2410         snd_mask_any(&m);
2411         pcm_for_each_format(k) {
2412                 int bits;
2413                 if (!snd_mask_test_format(mask, k))
2414                         continue;
2415                 bits = snd_pcm_format_physical_width(k);
2416                 if (bits <= 0)
2417                         continue; /* ignore invalid formats */
2418                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2419                         snd_mask_reset(&m, (__force unsigned)k);
2420         }
2421         return snd_mask_refine(mask, &m);
2422 }
2423
2424 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2425                                        struct snd_pcm_hw_rule *rule)
2426 {
2427         struct snd_interval t;
2428         snd_pcm_format_t k;
2429
2430         t.min = UINT_MAX;
2431         t.max = 0;
2432         t.openmin = 0;
2433         t.openmax = 0;
2434         pcm_for_each_format(k) {
2435                 int bits;
2436                 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2437                         continue;
2438                 bits = snd_pcm_format_physical_width(k);
2439                 if (bits <= 0)
2440                         continue; /* ignore invalid formats */
2441                 if (t.min > (unsigned)bits)
2442                         t.min = bits;
2443                 if (t.max < (unsigned)bits)
2444                         t.max = bits;
2445         }
2446         t.integer = 1;
2447         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2448 }
2449
2450 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2451 #error "Change this table"
2452 #endif
2453
2454 static const unsigned int rates[] = {
2455         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2456         48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2457 };
2458
2459 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2460         .count = ARRAY_SIZE(rates),
2461         .list = rates,
2462 };
2463
2464 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2465                                 struct snd_pcm_hw_rule *rule)
2466 {
2467         struct snd_pcm_hardware *hw = rule->private;
2468         return snd_interval_list(hw_param_interval(params, rule->var),
2469                                  snd_pcm_known_rates.count,
2470                                  snd_pcm_known_rates.list, hw->rates);
2471 }
2472
2473 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2474                                             struct snd_pcm_hw_rule *rule)
2475 {
2476         struct snd_interval t;
2477         struct snd_pcm_substream *substream = rule->private;
2478         t.min = 0;
2479         t.max = substream->buffer_bytes_max;
2480         t.openmin = 0;
2481         t.openmax = 0;
2482         t.integer = 1;
2483         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2484 }
2485
2486 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2487 {
2488         struct snd_pcm_runtime *runtime = substream->runtime;
2489         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2490         int k, err;
2491
2492         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2493                 snd_mask_any(constrs_mask(constrs, k));
2494         }
2495
2496         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2497                 snd_interval_any(constrs_interval(constrs, k));
2498         }
2499
2500         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2501         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2502         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2503         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2504         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2505
2506         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2507                                    snd_pcm_hw_rule_format, NULL,
2508                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2509         if (err < 0)
2510                 return err;
2511         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2512                                   snd_pcm_hw_rule_sample_bits, NULL,
2513                                   SNDRV_PCM_HW_PARAM_FORMAT,
2514                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2515         if (err < 0)
2516                 return err;
2517         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2518                                   snd_pcm_hw_rule_div, NULL,
2519                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2520         if (err < 0)
2521                 return err;
2522         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2523                                   snd_pcm_hw_rule_mul, NULL,
2524                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2525         if (err < 0)
2526                 return err;
2527         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2528                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2529                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2530         if (err < 0)
2531                 return err;
2532         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2533                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2534                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2535         if (err < 0)
2536                 return err;
2537         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2538                                   snd_pcm_hw_rule_div, NULL,
2539                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2540         if (err < 0)
2541                 return err;
2542         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2543                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2544                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2545         if (err < 0)
2546                 return err;
2547         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2548                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2549                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2550         if (err < 0)
2551                 return err;
2552         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2553                                   snd_pcm_hw_rule_div, NULL,
2554                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2555         if (err < 0)
2556                 return err;
2557         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2558                                   snd_pcm_hw_rule_div, NULL,
2559                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2560         if (err < 0)
2561                 return err;
2562         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2563                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2564                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2565         if (err < 0)
2566                 return err;
2567         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2568                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2569                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2570         if (err < 0)
2571                 return err;
2572         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2573                                   snd_pcm_hw_rule_mul, NULL,
2574                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2575         if (err < 0)
2576                 return err;
2577         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2578                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2579                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2580         if (err < 0)
2581                 return err;
2582         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2583                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2584                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2585         if (err < 0)
2586                 return err;
2587         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2588                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2589                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2590         if (err < 0)
2591                 return err;
2592         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2593                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2594                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2595         if (err < 0)
2596                 return err;
2597         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2598                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2599                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2600         if (err < 0)
2601                 return err;
2602         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2603                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2604                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2605         if (err < 0)
2606                 return err;
2607         return 0;
2608 }
2609
2610 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2611 {
2612         struct snd_pcm_runtime *runtime = substream->runtime;
2613         struct snd_pcm_hardware *hw = &runtime->hw;
2614         int err;
2615         unsigned int mask = 0;
2616
2617         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2618                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2619         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2620                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2621         if (hw_support_mmap(substream)) {
2622                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2623                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2624                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2625                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2626                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2627                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2628         }
2629         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2630         if (err < 0)
2631                 return err;
2632
2633         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2634         if (err < 0)
2635                 return err;
2636
2637         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2638                                          PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2639         if (err < 0)
2640                 return err;
2641
2642         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2643                                            hw->channels_min, hw->channels_max);
2644         if (err < 0)
2645                 return err;
2646
2647         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2648                                            hw->rate_min, hw->rate_max);
2649         if (err < 0)
2650                 return err;
2651
2652         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2653                                            hw->period_bytes_min, hw->period_bytes_max);
2654         if (err < 0)
2655                 return err;
2656
2657         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2658                                            hw->periods_min, hw->periods_max);
2659         if (err < 0)
2660                 return err;
2661
2662         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2663                                            hw->period_bytes_min, hw->buffer_bytes_max);
2664         if (err < 0)
2665                 return err;
2666
2667         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2668                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2669                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2670         if (err < 0)
2671                 return err;
2672
2673         /* FIXME: remove */
2674         if (runtime->dma_bytes) {
2675                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2676                 if (err < 0)
2677                         return err;
2678         }
2679
2680         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2681                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2682                                           snd_pcm_hw_rule_rate, hw,
2683                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2684                 if (err < 0)
2685                         return err;
2686         }
2687
2688         /* FIXME: this belong to lowlevel */
2689         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2690
2691         return 0;
2692 }
2693
2694 static void pcm_release_private(struct snd_pcm_substream *substream)
2695 {
2696         if (snd_pcm_stream_linked(substream))
2697                 snd_pcm_unlink(substream);
2698 }
2699
2700 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2701 {
2702         substream->ref_count--;
2703         if (substream->ref_count > 0)
2704                 return;
2705
2706         snd_pcm_drop(substream);
2707         if (substream->hw_opened) {
2708                 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2709                         do_hw_free(substream);
2710                 substream->ops->close(substream);
2711                 substream->hw_opened = 0;
2712         }
2713         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2714                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2715         if (substream->pcm_release) {
2716                 substream->pcm_release(substream);
2717                 substream->pcm_release = NULL;
2718         }
2719         snd_pcm_detach_substream(substream);
2720 }
2721 EXPORT_SYMBOL(snd_pcm_release_substream);
2722
2723 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2724                            struct file *file,
2725                            struct snd_pcm_substream **rsubstream)
2726 {
2727         struct snd_pcm_substream *substream;
2728         int err;
2729
2730         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2731         if (err < 0)
2732                 return err;
2733         if (substream->ref_count > 1) {
2734                 *rsubstream = substream;
2735                 return 0;
2736         }
2737
2738         err = snd_pcm_hw_constraints_init(substream);
2739         if (err < 0) {
2740                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2741                 goto error;
2742         }
2743
2744         err = substream->ops->open(substream);
2745         if (err < 0)
2746                 goto error;
2747
2748         substream->hw_opened = 1;
2749
2750         err = snd_pcm_hw_constraints_complete(substream);
2751         if (err < 0) {
2752                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2753                 goto error;
2754         }
2755
2756         /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2757          * the DMA buffer requires it
2758          */
2759         if (substream->managed_buffer_alloc &&
2760             substream->dma_buffer.dev.need_sync)
2761                 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2762
2763         *rsubstream = substream;
2764         return 0;
2765
2766  error:
2767         snd_pcm_release_substream(substream);
2768         return err;
2769 }
2770 EXPORT_SYMBOL(snd_pcm_open_substream);
2771
2772 static int snd_pcm_open_file(struct file *file,
2773                              struct snd_pcm *pcm,
2774                              int stream)
2775 {
2776         struct snd_pcm_file *pcm_file;
2777         struct snd_pcm_substream *substream;
2778         int err;
2779
2780         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2781         if (err < 0)
2782                 return err;
2783
2784         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2785         if (pcm_file == NULL) {
2786                 snd_pcm_release_substream(substream);
2787                 return -ENOMEM;
2788         }
2789         pcm_file->substream = substream;
2790         if (substream->ref_count == 1)
2791                 substream->pcm_release = pcm_release_private;
2792         file->private_data = pcm_file;
2793
2794         return 0;
2795 }
2796
2797 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2798 {
2799         struct snd_pcm *pcm;
2800         int err = nonseekable_open(inode, file);
2801         if (err < 0)
2802                 return err;
2803         pcm = snd_lookup_minor_data(iminor(inode),
2804                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2805         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2806         if (pcm)
2807                 snd_card_unref(pcm->card);
2808         return err;
2809 }
2810
2811 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2812 {
2813         struct snd_pcm *pcm;
2814         int err = nonseekable_open(inode, file);
2815         if (err < 0)
2816                 return err;
2817         pcm = snd_lookup_minor_data(iminor(inode),
2818                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2819         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2820         if (pcm)
2821                 snd_card_unref(pcm->card);
2822         return err;
2823 }
2824
2825 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2826 {
2827         int err;
2828         wait_queue_entry_t wait;
2829
2830         if (pcm == NULL) {
2831                 err = -ENODEV;
2832                 goto __error1;
2833         }
2834         err = snd_card_file_add(pcm->card, file);
2835         if (err < 0)
2836                 goto __error1;
2837         if (!try_module_get(pcm->card->module)) {
2838                 err = -EFAULT;
2839                 goto __error2;
2840         }
2841         init_waitqueue_entry(&wait, current);
2842         add_wait_queue(&pcm->open_wait, &wait);
2843         mutex_lock(&pcm->open_mutex);
2844         while (1) {
2845                 err = snd_pcm_open_file(file, pcm, stream);
2846                 if (err >= 0)
2847                         break;
2848                 if (err == -EAGAIN) {
2849                         if (file->f_flags & O_NONBLOCK) {
2850                                 err = -EBUSY;
2851                                 break;
2852                         }
2853                 } else
2854                         break;
2855                 set_current_state(TASK_INTERRUPTIBLE);
2856                 mutex_unlock(&pcm->open_mutex);
2857                 schedule();
2858                 mutex_lock(&pcm->open_mutex);
2859                 if (pcm->card->shutdown) {
2860                         err = -ENODEV;
2861                         break;
2862                 }
2863                 if (signal_pending(current)) {
2864                         err = -ERESTARTSYS;
2865                         break;
2866                 }
2867         }
2868         remove_wait_queue(&pcm->open_wait, &wait);
2869         mutex_unlock(&pcm->open_mutex);
2870         if (err < 0)
2871                 goto __error;
2872         return err;
2873
2874       __error:
2875         module_put(pcm->card->module);
2876       __error2:
2877         snd_card_file_remove(pcm->card, file);
2878       __error1:
2879         return err;
2880 }
2881
2882 static int snd_pcm_release(struct inode *inode, struct file *file)
2883 {
2884         struct snd_pcm *pcm;
2885         struct snd_pcm_substream *substream;
2886         struct snd_pcm_file *pcm_file;
2887
2888         pcm_file = file->private_data;
2889         substream = pcm_file->substream;
2890         if (snd_BUG_ON(!substream))
2891                 return -ENXIO;
2892         pcm = substream->pcm;
2893
2894         /* block until the device gets woken up as it may touch the hardware */
2895         snd_power_wait(pcm->card);
2896
2897         mutex_lock(&pcm->open_mutex);
2898         snd_pcm_release_substream(substream);
2899         kfree(pcm_file);
2900         mutex_unlock(&pcm->open_mutex);
2901         wake_up(&pcm->open_wait);
2902         module_put(pcm->card->module);
2903         snd_card_file_remove(pcm->card, file);
2904         return 0;
2905 }
2906
2907 /* check and update PCM state; return 0 or a negative error
2908  * call this inside PCM lock
2909  */
2910 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2911 {
2912         switch (substream->runtime->state) {
2913         case SNDRV_PCM_STATE_DRAINING:
2914                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2915                         return -EBADFD;
2916                 fallthrough;
2917         case SNDRV_PCM_STATE_RUNNING:
2918                 return snd_pcm_update_hw_ptr(substream);
2919         case SNDRV_PCM_STATE_PREPARED:
2920         case SNDRV_PCM_STATE_PAUSED:
2921                 return 0;
2922         case SNDRV_PCM_STATE_SUSPENDED:
2923                 return -ESTRPIPE;
2924         case SNDRV_PCM_STATE_XRUN:
2925                 return -EPIPE;
2926         default:
2927                 return -EBADFD;
2928         }
2929 }
2930
2931 /* increase the appl_ptr; returns the processed frames or a negative error */
2932 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2933                                           snd_pcm_uframes_t frames,
2934                                            snd_pcm_sframes_t avail)
2935 {
2936         struct snd_pcm_runtime *runtime = substream->runtime;
2937         snd_pcm_sframes_t appl_ptr;
2938         int ret;
2939
2940         if (avail <= 0)
2941                 return 0;
2942         if (frames > (snd_pcm_uframes_t)avail)
2943                 frames = avail;
2944         appl_ptr = runtime->control->appl_ptr + frames;
2945         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2946                 appl_ptr -= runtime->boundary;
2947         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2948         return ret < 0 ? ret : frames;
2949 }
2950
2951 /* decrease the appl_ptr; returns the processed frames or zero for error */
2952 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2953                                          snd_pcm_uframes_t frames,
2954                                          snd_pcm_sframes_t avail)
2955 {
2956         struct snd_pcm_runtime *runtime = substream->runtime;
2957         snd_pcm_sframes_t appl_ptr;
2958         int ret;
2959
2960         if (avail <= 0)
2961                 return 0;
2962         if (frames > (snd_pcm_uframes_t)avail)
2963                 frames = avail;
2964         appl_ptr = runtime->control->appl_ptr - frames;
2965         if (appl_ptr < 0)
2966                 appl_ptr += runtime->boundary;
2967         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2968         /* NOTE: we return zero for errors because PulseAudio gets depressed
2969          * upon receiving an error from rewind ioctl and stops processing
2970          * any longer.  Returning zero means that no rewind is done, so
2971          * it's not absolutely wrong to answer like that.
2972          */
2973         return ret < 0 ? 0 : frames;
2974 }
2975
2976 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2977                                         snd_pcm_uframes_t frames)
2978 {
2979         snd_pcm_sframes_t ret;
2980
2981         if (frames == 0)
2982                 return 0;
2983
2984         snd_pcm_stream_lock_irq(substream);
2985         ret = do_pcm_hwsync(substream);
2986         if (!ret)
2987                 ret = rewind_appl_ptr(substream, frames,
2988                                       snd_pcm_hw_avail(substream));
2989         snd_pcm_stream_unlock_irq(substream);
2990         if (ret >= 0)
2991                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2992         return ret;
2993 }
2994
2995 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2996                                          snd_pcm_uframes_t frames)
2997 {
2998         snd_pcm_sframes_t ret;
2999
3000         if (frames == 0)
3001                 return 0;
3002
3003         snd_pcm_stream_lock_irq(substream);
3004         ret = do_pcm_hwsync(substream);
3005         if (!ret)
3006                 ret = forward_appl_ptr(substream, frames,
3007                                        snd_pcm_avail(substream));
3008         snd_pcm_stream_unlock_irq(substream);
3009         if (ret >= 0)
3010                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3011         return ret;
3012 }
3013
3014 static int snd_pcm_delay(struct snd_pcm_substream *substream,
3015                          snd_pcm_sframes_t *delay)
3016 {
3017         int err;
3018
3019         snd_pcm_stream_lock_irq(substream);
3020         err = do_pcm_hwsync(substream);
3021         if (delay && !err)
3022                 *delay = snd_pcm_calc_delay(substream);
3023         snd_pcm_stream_unlock_irq(substream);
3024         snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3025
3026         return err;
3027 }
3028
3029 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3030 {
3031         return snd_pcm_delay(substream, NULL);
3032 }
3033
3034 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3035                             struct snd_pcm_sync_ptr __user *_sync_ptr)
3036 {
3037         struct snd_pcm_runtime *runtime = substream->runtime;
3038         struct snd_pcm_sync_ptr sync_ptr;
3039         volatile struct snd_pcm_mmap_status *status;
3040         volatile struct snd_pcm_mmap_control *control;
3041         int err;
3042
3043         memset(&sync_ptr, 0, sizeof(sync_ptr));
3044         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3045                 return -EFAULT;
3046         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3047                 return -EFAULT;
3048         status = runtime->status;
3049         control = runtime->control;
3050         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3051                 err = snd_pcm_hwsync(substream);
3052                 if (err < 0)
3053                         return err;
3054         }
3055         snd_pcm_stream_lock_irq(substream);
3056         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3057                 err = pcm_lib_apply_appl_ptr(substream,
3058                                              sync_ptr.c.control.appl_ptr);
3059                 if (err < 0) {
3060                         snd_pcm_stream_unlock_irq(substream);
3061                         return err;
3062                 }
3063         } else {
3064                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3065         }
3066         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3067                 control->avail_min = sync_ptr.c.control.avail_min;
3068         else
3069                 sync_ptr.c.control.avail_min = control->avail_min;
3070         sync_ptr.s.status.state = status->state;
3071         sync_ptr.s.status.hw_ptr = status->hw_ptr;
3072         sync_ptr.s.status.tstamp = status->tstamp;
3073         sync_ptr.s.status.suspended_state = status->suspended_state;
3074         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3075         snd_pcm_stream_unlock_irq(substream);
3076         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3077                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3078         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3079                 return -EFAULT;
3080         return 0;
3081 }
3082
3083 struct snd_pcm_mmap_status32 {
3084         snd_pcm_state_t state;
3085         s32 pad1;
3086         u32 hw_ptr;
3087         s32 tstamp_sec;
3088         s32 tstamp_nsec;
3089         snd_pcm_state_t suspended_state;
3090         s32 audio_tstamp_sec;
3091         s32 audio_tstamp_nsec;
3092 } __attribute__((packed));
3093
3094 struct snd_pcm_mmap_control32 {
3095         u32 appl_ptr;
3096         u32 avail_min;
3097 };
3098
3099 struct snd_pcm_sync_ptr32 {
3100         u32 flags;
3101         union {
3102                 struct snd_pcm_mmap_status32 status;
3103                 unsigned char reserved[64];
3104         } s;
3105         union {
3106                 struct snd_pcm_mmap_control32 control;
3107                 unsigned char reserved[64];
3108         } c;
3109 } __attribute__((packed));
3110
3111 /* recalcuate the boundary within 32bit */
3112 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3113 {
3114         snd_pcm_uframes_t boundary;
3115
3116         if (! runtime->buffer_size)
3117                 return 0;
3118         boundary = runtime->buffer_size;
3119         while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3120                 boundary *= 2;
3121         return boundary;
3122 }
3123
3124 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3125                                          struct snd_pcm_sync_ptr32 __user *src)
3126 {
3127         struct snd_pcm_runtime *runtime = substream->runtime;
3128         volatile struct snd_pcm_mmap_status *status;
3129         volatile struct snd_pcm_mmap_control *control;
3130         u32 sflags;
3131         struct snd_pcm_mmap_control scontrol;
3132         struct snd_pcm_mmap_status sstatus;
3133         snd_pcm_uframes_t boundary;
3134         int err;
3135
3136         if (snd_BUG_ON(!runtime))
3137                 return -EINVAL;
3138
3139         if (get_user(sflags, &src->flags) ||
3140             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3141             get_user(scontrol.avail_min, &src->c.control.avail_min))
3142                 return -EFAULT;
3143         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3144                 err = snd_pcm_hwsync(substream);
3145                 if (err < 0)
3146                         return err;
3147         }
3148         status = runtime->status;
3149         control = runtime->control;
3150         boundary = recalculate_boundary(runtime);
3151         if (! boundary)
3152                 boundary = 0x7fffffff;
3153         snd_pcm_stream_lock_irq(substream);
3154         /* FIXME: we should consider the boundary for the sync from app */
3155         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3156                 err = pcm_lib_apply_appl_ptr(substream,
3157                                 scontrol.appl_ptr);
3158                 if (err < 0) {
3159                         snd_pcm_stream_unlock_irq(substream);
3160                         return err;
3161                 }
3162         } else
3163                 scontrol.appl_ptr = control->appl_ptr % boundary;
3164         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3165                 control->avail_min = scontrol.avail_min;
3166         else
3167                 scontrol.avail_min = control->avail_min;
3168         sstatus.state = status->state;
3169         sstatus.hw_ptr = status->hw_ptr % boundary;
3170         sstatus.tstamp = status->tstamp;
3171         sstatus.suspended_state = status->suspended_state;
3172         sstatus.audio_tstamp = status->audio_tstamp;
3173         snd_pcm_stream_unlock_irq(substream);
3174         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3175                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3176         if (put_user(sstatus.state, &src->s.status.state) ||
3177             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3178             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3179             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3180             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3181             put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3182             put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3183             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3184             put_user(scontrol.avail_min, &src->c.control.avail_min))
3185                 return -EFAULT;
3186
3187         return 0;
3188 }
3189 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3190
3191 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3192 {
3193         struct snd_pcm_runtime *runtime = substream->runtime;
3194         int arg;
3195
3196         if (get_user(arg, _arg))
3197                 return -EFAULT;
3198         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3199                 return -EINVAL;
3200         runtime->tstamp_type = arg;
3201         return 0;
3202 }
3203
3204 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3205                                       struct snd_xferi __user *_xferi)
3206 {
3207         struct snd_xferi xferi;
3208         struct snd_pcm_runtime *runtime = substream->runtime;
3209         snd_pcm_sframes_t result;
3210
3211         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3212                 return -EBADFD;
3213         if (put_user(0, &_xferi->result))
3214                 return -EFAULT;
3215         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3216                 return -EFAULT;
3217         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3218                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3219         else
3220                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3221         if (put_user(result, &_xferi->result))
3222                 return -EFAULT;
3223         return result < 0 ? result : 0;
3224 }
3225
3226 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3227                                       struct snd_xfern __user *_xfern)
3228 {
3229         struct snd_xfern xfern;
3230         struct snd_pcm_runtime *runtime = substream->runtime;
3231         void *bufs;
3232         snd_pcm_sframes_t result;
3233
3234         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3235                 return -EBADFD;
3236         if (runtime->channels > 128)
3237                 return -EINVAL;
3238         if (put_user(0, &_xfern->result))
3239                 return -EFAULT;
3240         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3241                 return -EFAULT;
3242
3243         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3244         if (IS_ERR(bufs))
3245                 return PTR_ERR(bufs);
3246         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3247                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3248         else
3249                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3250         kfree(bufs);
3251         if (put_user(result, &_xfern->result))
3252                 return -EFAULT;
3253         return result < 0 ? result : 0;
3254 }
3255
3256 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3257                                 snd_pcm_uframes_t __user *_frames)
3258 {
3259         snd_pcm_uframes_t frames;
3260         snd_pcm_sframes_t result;
3261
3262         if (get_user(frames, _frames))
3263                 return -EFAULT;
3264         if (put_user(0, _frames))
3265                 return -EFAULT;
3266         result = snd_pcm_rewind(substream, frames);
3267         if (put_user(result, _frames))
3268                 return -EFAULT;
3269         return result < 0 ? result : 0;
3270 }
3271
3272 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3273                                  snd_pcm_uframes_t __user *_frames)
3274 {
3275         snd_pcm_uframes_t frames;
3276         snd_pcm_sframes_t result;
3277
3278         if (get_user(frames, _frames))
3279                 return -EFAULT;
3280         if (put_user(0, _frames))
3281                 return -EFAULT;
3282         result = snd_pcm_forward(substream, frames);
3283         if (put_user(result, _frames))
3284                 return -EFAULT;
3285         return result < 0 ? result : 0;
3286 }
3287
3288 static int snd_pcm_common_ioctl(struct file *file,
3289                                  struct snd_pcm_substream *substream,
3290                                  unsigned int cmd, void __user *arg)
3291 {
3292         struct snd_pcm_file *pcm_file = file->private_data;
3293         int res;
3294
3295         if (PCM_RUNTIME_CHECK(substream))
3296                 return -ENXIO;
3297
3298         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3299                 return -EBADFD;
3300
3301         res = snd_power_wait(substream->pcm->card);
3302         if (res < 0)
3303                 return res;
3304
3305         switch (cmd) {
3306         case SNDRV_PCM_IOCTL_PVERSION:
3307                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3308         case SNDRV_PCM_IOCTL_INFO:
3309                 return snd_pcm_info_user(substream, arg);
3310         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
3311                 return 0;
3312         case SNDRV_PCM_IOCTL_TTSTAMP:
3313                 return snd_pcm_tstamp(substream, arg);
3314         case SNDRV_PCM_IOCTL_USER_PVERSION:
3315                 if (get_user(pcm_file->user_pversion,
3316                              (unsigned int __user *)arg))
3317                         return -EFAULT;
3318                 return 0;
3319         case SNDRV_PCM_IOCTL_HW_REFINE:
3320                 return snd_pcm_hw_refine_user(substream, arg);
3321         case SNDRV_PCM_IOCTL_HW_PARAMS:
3322                 return snd_pcm_hw_params_user(substream, arg);
3323         case SNDRV_PCM_IOCTL_HW_FREE:
3324                 return snd_pcm_hw_free(substream);
3325         case SNDRV_PCM_IOCTL_SW_PARAMS:
3326                 return snd_pcm_sw_params_user(substream, arg);
3327         case SNDRV_PCM_IOCTL_STATUS32:
3328                 return snd_pcm_status_user32(substream, arg, false);
3329         case SNDRV_PCM_IOCTL_STATUS_EXT32:
3330                 return snd_pcm_status_user32(substream, arg, true);
3331         case SNDRV_PCM_IOCTL_STATUS64:
3332                 return snd_pcm_status_user64(substream, arg, false);
3333         case SNDRV_PCM_IOCTL_STATUS_EXT64:
3334                 return snd_pcm_status_user64(substream, arg, true);
3335         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3336                 return snd_pcm_channel_info_user(substream, arg);
3337         case SNDRV_PCM_IOCTL_PREPARE:
3338                 return snd_pcm_prepare(substream, file);
3339         case SNDRV_PCM_IOCTL_RESET:
3340                 return snd_pcm_reset(substream);
3341         case SNDRV_PCM_IOCTL_START:
3342                 return snd_pcm_start_lock_irq(substream);
3343         case SNDRV_PCM_IOCTL_LINK:
3344                 return snd_pcm_link(substream, (int)(unsigned long) arg);
3345         case SNDRV_PCM_IOCTL_UNLINK:
3346                 return snd_pcm_unlink(substream);
3347         case SNDRV_PCM_IOCTL_RESUME:
3348                 return snd_pcm_resume(substream);
3349         case SNDRV_PCM_IOCTL_XRUN:
3350                 return snd_pcm_xrun(substream);
3351         case SNDRV_PCM_IOCTL_HWSYNC:
3352                 return snd_pcm_hwsync(substream);
3353         case SNDRV_PCM_IOCTL_DELAY:
3354         {
3355                 snd_pcm_sframes_t delay = 0;
3356                 snd_pcm_sframes_t __user *res = arg;
3357                 int err;
3358
3359                 err = snd_pcm_delay(substream, &delay);
3360                 if (err)
3361                         return err;
3362                 if (put_user(delay, res))
3363                         return -EFAULT;
3364                 return 0;
3365         }
3366         case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3367                 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3368         case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3369                 return snd_pcm_sync_ptr(substream, arg);
3370 #ifdef CONFIG_SND_SUPPORT_OLD_API
3371         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3372                 return snd_pcm_hw_refine_old_user(substream, arg);
3373         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3374                 return snd_pcm_hw_params_old_user(substream, arg);
3375 #endif
3376         case SNDRV_PCM_IOCTL_DRAIN:
3377                 return snd_pcm_drain(substream, file);
3378         case SNDRV_PCM_IOCTL_DROP:
3379                 return snd_pcm_drop(substream);
3380         case SNDRV_PCM_IOCTL_PAUSE:
3381                 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3382         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3383         case SNDRV_PCM_IOCTL_READI_FRAMES:
3384                 return snd_pcm_xferi_frames_ioctl(substream, arg);
3385         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3386         case SNDRV_PCM_IOCTL_READN_FRAMES:
3387                 return snd_pcm_xfern_frames_ioctl(substream, arg);
3388         case SNDRV_PCM_IOCTL_REWIND:
3389                 return snd_pcm_rewind_ioctl(substream, arg);
3390         case SNDRV_PCM_IOCTL_FORWARD:
3391                 return snd_pcm_forward_ioctl(substream, arg);
3392         }
3393         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3394         return -ENOTTY;
3395 }
3396
3397 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3398                           unsigned long arg)
3399 {
3400         struct snd_pcm_file *pcm_file;
3401
3402         pcm_file = file->private_data;
3403
3404         if (((cmd >> 8) & 0xff) != 'A')
3405                 return -ENOTTY;
3406
3407         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3408                                      (void __user *)arg);
3409 }
3410
3411 /**
3412  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3413  * @substream: PCM substream
3414  * @cmd: IOCTL cmd
3415  * @arg: IOCTL argument
3416  *
3417  * The function is provided primarily for OSS layer and USB gadget drivers,
3418  * and it allows only the limited set of ioctls (hw_params, sw_params,
3419  * prepare, start, drain, drop, forward).
3420  *
3421  * Return: zero if successful, or a negative error code
3422  */
3423 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3424                          unsigned int cmd, void *arg)
3425 {
3426         snd_pcm_uframes_t *frames = arg;
3427         snd_pcm_sframes_t result;
3428
3429         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3430                 return -EBADFD;
3431
3432         switch (cmd) {
3433         case SNDRV_PCM_IOCTL_FORWARD:
3434         {
3435                 /* provided only for OSS; capture-only and no value returned */
3436                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3437                         return -EINVAL;
3438                 result = snd_pcm_forward(substream, *frames);
3439                 return result < 0 ? result : 0;
3440         }
3441         case SNDRV_PCM_IOCTL_HW_PARAMS:
3442                 return snd_pcm_hw_params(substream, arg);
3443         case SNDRV_PCM_IOCTL_SW_PARAMS:
3444                 return snd_pcm_sw_params(substream, arg);
3445         case SNDRV_PCM_IOCTL_PREPARE:
3446                 return snd_pcm_prepare(substream, NULL);
3447         case SNDRV_PCM_IOCTL_START:
3448                 return snd_pcm_start_lock_irq(substream);
3449         case SNDRV_PCM_IOCTL_DRAIN:
3450                 return snd_pcm_drain(substream, NULL);
3451         case SNDRV_PCM_IOCTL_DROP:
3452                 return snd_pcm_drop(substream);
3453         case SNDRV_PCM_IOCTL_DELAY:
3454                 return snd_pcm_delay(substream, frames);
3455         default:
3456                 return -EINVAL;
3457         }
3458 }
3459 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3460
3461 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3462                             loff_t * offset)
3463 {
3464         struct snd_pcm_file *pcm_file;
3465         struct snd_pcm_substream *substream;
3466         struct snd_pcm_runtime *runtime;
3467         snd_pcm_sframes_t result;
3468
3469         pcm_file = file->private_data;
3470         substream = pcm_file->substream;
3471         if (PCM_RUNTIME_CHECK(substream))
3472                 return -ENXIO;
3473         runtime = substream->runtime;
3474         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3475             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3476                 return -EBADFD;
3477         if (!frame_aligned(runtime, count))
3478                 return -EINVAL;
3479         count = bytes_to_frames(runtime, count);
3480         result = snd_pcm_lib_read(substream, buf, count);
3481         if (result > 0)
3482                 result = frames_to_bytes(runtime, result);
3483         return result;
3484 }
3485
3486 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3487                              size_t count, loff_t * offset)
3488 {
3489         struct snd_pcm_file *pcm_file;
3490         struct snd_pcm_substream *substream;
3491         struct snd_pcm_runtime *runtime;
3492         snd_pcm_sframes_t result;
3493
3494         pcm_file = file->private_data;
3495         substream = pcm_file->substream;
3496         if (PCM_RUNTIME_CHECK(substream))
3497                 return -ENXIO;
3498         runtime = substream->runtime;
3499         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3500             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3501                 return -EBADFD;
3502         if (!frame_aligned(runtime, count))
3503                 return -EINVAL;
3504         count = bytes_to_frames(runtime, count);
3505         result = snd_pcm_lib_write(substream, buf, count);
3506         if (result > 0)
3507                 result = frames_to_bytes(runtime, result);
3508         return result;
3509 }
3510
3511 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3512 {
3513         struct snd_pcm_file *pcm_file;
3514         struct snd_pcm_substream *substream;
3515         struct snd_pcm_runtime *runtime;
3516         snd_pcm_sframes_t result;
3517         unsigned long i;
3518         void __user **bufs;
3519         snd_pcm_uframes_t frames;
3520         const struct iovec *iov = iter_iov(to);
3521
3522         pcm_file = iocb->ki_filp->private_data;
3523         substream = pcm_file->substream;
3524         if (PCM_RUNTIME_CHECK(substream))
3525                 return -ENXIO;
3526         runtime = substream->runtime;
3527         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3528             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3529                 return -EBADFD;
3530         if (!to->user_backed)
3531                 return -EINVAL;
3532         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3533                 return -EINVAL;
3534         if (!frame_aligned(runtime, iov->iov_len))
3535                 return -EINVAL;
3536         frames = bytes_to_samples(runtime, iov->iov_len);
3537         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3538         if (bufs == NULL)
3539                 return -ENOMEM;
3540         for (i = 0; i < to->nr_segs; ++i) {
3541                 bufs[i] = iov->iov_base;
3542                 iov++;
3543         }
3544         result = snd_pcm_lib_readv(substream, bufs, frames);
3545         if (result > 0)
3546                 result = frames_to_bytes(runtime, result);
3547         kfree(bufs);
3548         return result;
3549 }
3550
3551 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3552 {
3553         struct snd_pcm_file *pcm_file;
3554         struct snd_pcm_substream *substream;
3555         struct snd_pcm_runtime *runtime;
3556         snd_pcm_sframes_t result;
3557         unsigned long i;
3558         void __user **bufs;
3559         snd_pcm_uframes_t frames;
3560         const struct iovec *iov = iter_iov(from);
3561
3562         pcm_file = iocb->ki_filp->private_data;
3563         substream = pcm_file->substream;
3564         if (PCM_RUNTIME_CHECK(substream))
3565                 return -ENXIO;
3566         runtime = substream->runtime;
3567         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3568             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3569                 return -EBADFD;
3570         if (!from->user_backed)
3571                 return -EINVAL;
3572         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3573             !frame_aligned(runtime, iov->iov_len))
3574                 return -EINVAL;
3575         frames = bytes_to_samples(runtime, iov->iov_len);
3576         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3577         if (bufs == NULL)
3578                 return -ENOMEM;
3579         for (i = 0; i < from->nr_segs; ++i) {
3580                 bufs[i] = iov->iov_base;
3581                 iov++;
3582         }
3583         result = snd_pcm_lib_writev(substream, bufs, frames);
3584         if (result > 0)
3585                 result = frames_to_bytes(runtime, result);
3586         kfree(bufs);
3587         return result;
3588 }
3589
3590 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3591 {
3592         struct snd_pcm_file *pcm_file;
3593         struct snd_pcm_substream *substream;
3594         struct snd_pcm_runtime *runtime;
3595         __poll_t mask, ok;
3596         snd_pcm_uframes_t avail;
3597
3598         pcm_file = file->private_data;
3599
3600         substream = pcm_file->substream;
3601         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3602                 ok = EPOLLOUT | EPOLLWRNORM;
3603         else
3604                 ok = EPOLLIN | EPOLLRDNORM;
3605         if (PCM_RUNTIME_CHECK(substream))
3606                 return ok | EPOLLERR;
3607
3608         runtime = substream->runtime;
3609         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3610                 return ok | EPOLLERR;
3611
3612         poll_wait(file, &runtime->sleep, wait);
3613
3614         mask = 0;
3615         snd_pcm_stream_lock_irq(substream);
3616         avail = snd_pcm_avail(substream);
3617         switch (runtime->state) {
3618         case SNDRV_PCM_STATE_RUNNING:
3619         case SNDRV_PCM_STATE_PREPARED:
3620         case SNDRV_PCM_STATE_PAUSED:
3621                 if (avail >= runtime->control->avail_min)
3622                         mask = ok;
3623                 break;
3624         case SNDRV_PCM_STATE_DRAINING:
3625                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3626                         mask = ok;
3627                         if (!avail)
3628                                 mask |= EPOLLERR;
3629                 }
3630                 break;
3631         default:
3632                 mask = ok | EPOLLERR;
3633                 break;
3634         }
3635         snd_pcm_stream_unlock_irq(substream);
3636         return mask;
3637 }
3638
3639 /*
3640  * mmap support
3641  */
3642
3643 /*
3644  * Only on coherent architectures, we can mmap the status and the control records
3645  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3646  */
3647 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3648 /*
3649  * mmap status record
3650  */
3651 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3652 {
3653         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3654         struct snd_pcm_runtime *runtime;
3655
3656         if (substream == NULL)
3657                 return VM_FAULT_SIGBUS;
3658         runtime = substream->runtime;
3659         vmf->page = virt_to_page(runtime->status);
3660         get_page(vmf->page);
3661         return 0;
3662 }
3663
3664 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3665 {
3666         .fault =        snd_pcm_mmap_status_fault,
3667 };
3668
3669 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3670                                struct vm_area_struct *area)
3671 {
3672         long size;
3673         if (!(area->vm_flags & VM_READ))
3674                 return -EINVAL;
3675         size = area->vm_end - area->vm_start;
3676         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3677                 return -EINVAL;
3678         area->vm_ops = &snd_pcm_vm_ops_status;
3679         area->vm_private_data = substream;
3680         vm_flags_mod(area, VM_DONTEXPAND | VM_DONTDUMP,
3681                      VM_WRITE | VM_MAYWRITE);
3682
3683         return 0;
3684 }
3685
3686 /*
3687  * mmap control record
3688  */
3689 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3690 {
3691         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3692         struct snd_pcm_runtime *runtime;
3693
3694         if (substream == NULL)
3695                 return VM_FAULT_SIGBUS;
3696         runtime = substream->runtime;
3697         vmf->page = virt_to_page(runtime->control);
3698         get_page(vmf->page);
3699         return 0;
3700 }
3701
3702 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3703 {
3704         .fault =        snd_pcm_mmap_control_fault,
3705 };
3706
3707 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3708                                 struct vm_area_struct *area)
3709 {
3710         long size;
3711         if (!(area->vm_flags & VM_READ))
3712                 return -EINVAL;
3713         size = area->vm_end - area->vm_start;
3714         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3715                 return -EINVAL;
3716         area->vm_ops = &snd_pcm_vm_ops_control;
3717         area->vm_private_data = substream;
3718         vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3719         return 0;
3720 }
3721
3722 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3723 {
3724         /* If drivers require the explicit sync (typically for non-coherent
3725          * pages), we have to disable the mmap of status and control data
3726          * to enforce the control via SYNC_PTR ioctl.
3727          */
3728         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3729                 return false;
3730         /* See pcm_control_mmap_allowed() below.
3731          * Since older alsa-lib requires both status and control mmaps to be
3732          * coupled, we have to disable the status mmap for old alsa-lib, too.
3733          */
3734         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3735             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3736                 return false;
3737         return true;
3738 }
3739
3740 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3741 {
3742         if (pcm_file->no_compat_mmap)
3743                 return false;
3744         /* see above */
3745         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3746                 return false;
3747         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3748          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3749          * thus it effectively assures the manual update of appl_ptr.
3750          */
3751         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3752                 return false;
3753         return true;
3754 }
3755
3756 #else /* ! coherent mmap */
3757 /*
3758  * don't support mmap for status and control records.
3759  */
3760 #define pcm_status_mmap_allowed(pcm_file)       false
3761 #define pcm_control_mmap_allowed(pcm_file)      false
3762
3763 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3764                                struct vm_area_struct *area)
3765 {
3766         return -ENXIO;
3767 }
3768 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3769                                 struct vm_area_struct *area)
3770 {
3771         return -ENXIO;
3772 }
3773 #endif /* coherent mmap */
3774
3775 /*
3776  * fault callback for mmapping a RAM page
3777  */
3778 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3779 {
3780         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3781         struct snd_pcm_runtime *runtime;
3782         unsigned long offset;
3783         struct page * page;
3784         size_t dma_bytes;
3785
3786         if (substream == NULL)
3787                 return VM_FAULT_SIGBUS;
3788         runtime = substream->runtime;
3789         offset = vmf->pgoff << PAGE_SHIFT;
3790         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3791         if (offset > dma_bytes - PAGE_SIZE)
3792                 return VM_FAULT_SIGBUS;
3793         if (substream->ops->page)
3794                 page = substream->ops->page(substream, offset);
3795         else if (!snd_pcm_get_dma_buf(substream))
3796                 page = virt_to_page(runtime->dma_area + offset);
3797         else
3798                 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3799         if (!page)
3800                 return VM_FAULT_SIGBUS;
3801         get_page(page);
3802         vmf->page = page;
3803         return 0;
3804 }
3805
3806 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3807         .open =         snd_pcm_mmap_data_open,
3808         .close =        snd_pcm_mmap_data_close,
3809 };
3810
3811 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3812         .open =         snd_pcm_mmap_data_open,
3813         .close =        snd_pcm_mmap_data_close,
3814         .fault =        snd_pcm_mmap_data_fault,
3815 };
3816
3817 /*
3818  * mmap the DMA buffer on RAM
3819  */
3820
3821 /**
3822  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3823  * @substream: PCM substream
3824  * @area: VMA
3825  *
3826  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3827  * this function is invoked implicitly.
3828  *
3829  * Return: zero if successful, or a negative error code
3830  */
3831 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3832                              struct vm_area_struct *area)
3833 {
3834         vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3835         if (!substream->ops->page &&
3836             !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3837                 return 0;
3838         /* mmap with fault handler */
3839         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3840         return 0;
3841 }
3842 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3843
3844 /*
3845  * mmap the DMA buffer on I/O memory area
3846  */
3847 #if SNDRV_PCM_INFO_MMAP_IOMEM
3848 /**
3849  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3850  * @substream: PCM substream
3851  * @area: VMA
3852  *
3853  * When your hardware uses the iomapped pages as the hardware buffer and
3854  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3855  * is supposed to work only on limited architectures.
3856  *
3857  * Return: zero if successful, or a negative error code
3858  */
3859 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3860                            struct vm_area_struct *area)
3861 {
3862         struct snd_pcm_runtime *runtime = substream->runtime;
3863
3864         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3865         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3866 }
3867 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3868 #endif /* SNDRV_PCM_INFO_MMAP */
3869
3870 /*
3871  * mmap DMA buffer
3872  */
3873 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3874                       struct vm_area_struct *area)
3875 {
3876         struct snd_pcm_runtime *runtime;
3877         long size;
3878         unsigned long offset;
3879         size_t dma_bytes;
3880         int err;
3881
3882         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3883                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3884                         return -EINVAL;
3885         } else {
3886                 if (!(area->vm_flags & VM_READ))
3887                         return -EINVAL;
3888         }
3889         runtime = substream->runtime;
3890         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3891                 return -EBADFD;
3892         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3893                 return -ENXIO;
3894         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3895             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3896                 return -EINVAL;
3897         size = area->vm_end - area->vm_start;
3898         offset = area->vm_pgoff << PAGE_SHIFT;
3899         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3900         if ((size_t)size > dma_bytes)
3901                 return -EINVAL;
3902         if (offset > dma_bytes - size)
3903                 return -EINVAL;
3904
3905         area->vm_ops = &snd_pcm_vm_ops_data;
3906         area->vm_private_data = substream;
3907         if (substream->ops->mmap)
3908                 err = substream->ops->mmap(substream, area);
3909         else
3910                 err = snd_pcm_lib_default_mmap(substream, area);
3911         if (!err)
3912                 atomic_inc(&substream->mmap_count);
3913         return err;
3914 }
3915 EXPORT_SYMBOL(snd_pcm_mmap_data);
3916
3917 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3918 {
3919         struct snd_pcm_file * pcm_file;
3920         struct snd_pcm_substream *substream;
3921         unsigned long offset;
3922
3923         pcm_file = file->private_data;
3924         substream = pcm_file->substream;
3925         if (PCM_RUNTIME_CHECK(substream))
3926                 return -ENXIO;
3927         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3928                 return -EBADFD;
3929
3930         offset = area->vm_pgoff << PAGE_SHIFT;
3931         switch (offset) {
3932         case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3933                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3934                         return -ENXIO;
3935                 fallthrough;
3936         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3937                 if (!pcm_status_mmap_allowed(pcm_file))
3938                         return -ENXIO;
3939                 return snd_pcm_mmap_status(substream, file, area);
3940         case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3941                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3942                         return -ENXIO;
3943                 fallthrough;
3944         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3945                 if (!pcm_control_mmap_allowed(pcm_file))
3946                         return -ENXIO;
3947                 return snd_pcm_mmap_control(substream, file, area);
3948         default:
3949                 return snd_pcm_mmap_data(substream, file, area);
3950         }
3951         return 0;
3952 }
3953
3954 static int snd_pcm_fasync(int fd, struct file * file, int on)
3955 {
3956         struct snd_pcm_file * pcm_file;
3957         struct snd_pcm_substream *substream;
3958         struct snd_pcm_runtime *runtime;
3959
3960         pcm_file = file->private_data;
3961         substream = pcm_file->substream;
3962         if (PCM_RUNTIME_CHECK(substream))
3963                 return -ENXIO;
3964         runtime = substream->runtime;
3965         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3966                 return -EBADFD;
3967         return snd_fasync_helper(fd, file, on, &runtime->fasync);
3968 }
3969
3970 /*
3971  * ioctl32 compat
3972  */
3973 #ifdef CONFIG_COMPAT
3974 #include "pcm_compat.c"
3975 #else
3976 #define snd_pcm_ioctl_compat    NULL
3977 #endif
3978
3979 /*
3980  *  To be removed helpers to keep binary compatibility
3981  */
3982
3983 #ifdef CONFIG_SND_SUPPORT_OLD_API
3984 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3985 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3986
3987 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3988                                                struct snd_pcm_hw_params_old *oparams)
3989 {
3990         unsigned int i;
3991
3992         memset(params, 0, sizeof(*params));
3993         params->flags = oparams->flags;
3994         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3995                 params->masks[i].bits[0] = oparams->masks[i];
3996         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3997         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3998         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3999         params->info = oparams->info;
4000         params->msbits = oparams->msbits;
4001         params->rate_num = oparams->rate_num;
4002         params->rate_den = oparams->rate_den;
4003         params->fifo_size = oparams->fifo_size;
4004 }
4005
4006 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
4007                                              struct snd_pcm_hw_params *params)
4008 {
4009         unsigned int i;
4010
4011         memset(oparams, 0, sizeof(*oparams));
4012         oparams->flags = params->flags;
4013         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4014                 oparams->masks[i] = params->masks[i].bits[0];
4015         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4016         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4017         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4018         oparams->info = params->info;
4019         oparams->msbits = params->msbits;
4020         oparams->rate_num = params->rate_num;
4021         oparams->rate_den = params->rate_den;
4022         oparams->fifo_size = params->fifo_size;
4023 }
4024
4025 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4026                                       struct snd_pcm_hw_params_old __user * _oparams)
4027 {
4028         struct snd_pcm_hw_params *params;
4029         struct snd_pcm_hw_params_old *oparams = NULL;
4030         int err;
4031
4032         params = kmalloc(sizeof(*params), GFP_KERNEL);
4033         if (!params)
4034                 return -ENOMEM;
4035
4036         oparams = memdup_user(_oparams, sizeof(*oparams));
4037         if (IS_ERR(oparams)) {
4038                 err = PTR_ERR(oparams);
4039                 goto out;
4040         }
4041         snd_pcm_hw_convert_from_old_params(params, oparams);
4042         err = snd_pcm_hw_refine(substream, params);
4043         if (err < 0)
4044                 goto out_old;
4045
4046         err = fixup_unreferenced_params(substream, params);
4047         if (err < 0)
4048                 goto out_old;
4049
4050         snd_pcm_hw_convert_to_old_params(oparams, params);
4051         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4052                 err = -EFAULT;
4053 out_old:
4054         kfree(oparams);
4055 out:
4056         kfree(params);
4057         return err;
4058 }
4059
4060 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4061                                       struct snd_pcm_hw_params_old __user * _oparams)
4062 {
4063         struct snd_pcm_hw_params *params;
4064         struct snd_pcm_hw_params_old *oparams = NULL;
4065         int err;
4066
4067         params = kmalloc(sizeof(*params), GFP_KERNEL);
4068         if (!params)
4069                 return -ENOMEM;
4070
4071         oparams = memdup_user(_oparams, sizeof(*oparams));
4072         if (IS_ERR(oparams)) {
4073                 err = PTR_ERR(oparams);
4074                 goto out;
4075         }
4076
4077         snd_pcm_hw_convert_from_old_params(params, oparams);
4078         err = snd_pcm_hw_params(substream, params);
4079         if (err < 0)
4080                 goto out_old;
4081
4082         snd_pcm_hw_convert_to_old_params(oparams, params);
4083         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4084                 err = -EFAULT;
4085 out_old:
4086         kfree(oparams);
4087 out:
4088         kfree(params);
4089         return err;
4090 }
4091 #endif /* CONFIG_SND_SUPPORT_OLD_API */
4092
4093 #ifndef CONFIG_MMU
4094 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4095                                                unsigned long addr,
4096                                                unsigned long len,
4097                                                unsigned long pgoff,
4098                                                unsigned long flags)
4099 {
4100         struct snd_pcm_file *pcm_file = file->private_data;
4101         struct snd_pcm_substream *substream = pcm_file->substream;
4102         struct snd_pcm_runtime *runtime = substream->runtime;
4103         unsigned long offset = pgoff << PAGE_SHIFT;
4104
4105         switch (offset) {
4106         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4107                 return (unsigned long)runtime->status;
4108         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4109                 return (unsigned long)runtime->control;
4110         default:
4111                 return (unsigned long)runtime->dma_area + offset;
4112         }
4113 }
4114 #else
4115 # define snd_pcm_get_unmapped_area NULL
4116 #endif
4117
4118 /*
4119  *  Register section
4120  */
4121
4122 const struct file_operations snd_pcm_f_ops[2] = {
4123         {
4124                 .owner =                THIS_MODULE,
4125                 .write =                snd_pcm_write,
4126                 .write_iter =           snd_pcm_writev,
4127                 .open =                 snd_pcm_playback_open,
4128                 .release =              snd_pcm_release,
4129                 .llseek =               no_llseek,
4130                 .poll =                 snd_pcm_poll,
4131                 .unlocked_ioctl =       snd_pcm_ioctl,
4132                 .compat_ioctl =         snd_pcm_ioctl_compat,
4133                 .mmap =                 snd_pcm_mmap,
4134                 .fasync =               snd_pcm_fasync,
4135                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4136         },
4137         {
4138                 .owner =                THIS_MODULE,
4139                 .read =                 snd_pcm_read,
4140                 .read_iter =            snd_pcm_readv,
4141                 .open =                 snd_pcm_capture_open,
4142                 .release =              snd_pcm_release,
4143                 .llseek =               no_llseek,
4144                 .poll =                 snd_pcm_poll,
4145                 .unlocked_ioctl =       snd_pcm_ioctl,
4146                 .compat_ioctl =         snd_pcm_ioctl_compat,
4147                 .mmap =                 snd_pcm_mmap,
4148                 .fasync =               snd_pcm_fasync,
4149                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4150         }
4151 };