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