sound/core/pcm_native.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Digital Audio (PCM) abstract layer
   4  *  Copyright (c) by Jaroslav Kysela <[email protected]>
   5  */
   6
   7 #include <linux/compat.h>
   8 #include <linux/mm.h>
   9 #include <linux/module.h>
  10 #include <linux/file.h>
  11 #include <linux/slab.h>
  12 #include <linux/sched/signal.h>
  13 #include <linux/time.h>
  14 #include <linux/pm_qos.h>
  15 #include <linux/io.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/vmalloc.h>
  18 #include <sound/core.h>
  19 #include <sound/control.h>
  20 #include <sound/info.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/timer.h>
  24 #include <sound/minors.h>
  25 #include <linux/uio.h>
  26 #include <linux/delay.h>
  27
  28 #include "pcm_local.h"
  29
  30 #ifdef CONFIG_SND_DEBUG
  31 #define CREATE_TRACE_POINTS
  32 #include "pcm_param_trace.h"
  33 #else
  34 #define trace_hw_mask_param_enabled()           0
  35 #define trace_hw_interval_param_enabled()       0
  36 #define trace_hw_mask_param(substream, type, index, prev, curr)
  37 #define trace_hw_interval_param(substream, type, index, prev, curr)
  38 #endif
  39
  40 /*
  41  *  Compatibility
  42  */
  43
  44 struct snd_pcm_hw_params_old {
  45         unsigned int flags;
  46         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  47                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  48         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  49                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  50         unsigned int rmask;
  51         unsigned int cmask;
  52         unsigned int info;
  53         unsigned int msbits;
  54         unsigned int rate_num;
  55         unsigned int rate_den;
  56         snd_pcm_uframes_t fifo_size;
  57         unsigned char reserved[64];
  58 };
  59
  60 #ifdef CONFIG_SND_SUPPORT_OLD_API
  61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  63
  64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 #endif
  69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  70
  71 /*
  72  *
  73  */
  74
  75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  76
  77 void snd_pcm_group_init(struct snd_pcm_group *group)
  78 {
  79         spin_lock_init(&group->lock);
  80         mutex_init(&group->mutex);
  81         INIT_LIST_HEAD(&group->substreams);
  82         refcount_set(&group->refs, 1);
  83 }
  84
  85 /* define group lock helpers */
  86 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
  87 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
  88 { \
  89         if (nonatomic) \
  90                 mutex_ ## mutex_action(&group->mutex); \
  91         else \
  92                 spin_ ## action(&group->lock); \
  93 }
  94
  95 DEFINE_PCM_GROUP_LOCK(lock, lock);
  96 DEFINE_PCM_GROUP_LOCK(unlock, unlock);
  97 DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
  98 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
  99
 100 /**
 101  * snd_pcm_stream_lock - Lock the PCM stream
 102  * @substream: PCM substream
 103  *
 104  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 105  * flag of the given substream.  This also takes the global link rw lock
 106  * (or rw sem), too, for avoiding the race with linked streams.
 107  */
 108 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 109 {
 110         snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
 111 }
 112 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
 113
 114 /**
 115  * snd_pcm_stream_unlock - Unlock the PCM stream
 116  * @substream: PCM substream
 117  *
 118  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
 119  */
 120 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 121 {
 122         snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
 123 }
 124 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
 125
 126 /**
 127  * snd_pcm_stream_lock_irq - Lock the PCM stream
 128  * @substream: PCM substream
 129  *
 130  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
 131  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 132  * as snd_pcm_stream_lock().
 133  */
 134 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 135 {
 136         snd_pcm_group_lock_irq(&substream->self_group,
 137                                substream->pcm->nonatomic);
 138 }
 139 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
 140
 141 static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
 142 {
 143         struct snd_pcm_group *group = &substream->self_group;
 144
 145         if (substream->pcm->nonatomic)
 146                 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
 147         else
 148                 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
 149 }
 150
 151 /**
 152  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 153  * @substream: PCM substream
 154  *
 155  * This is a counter-part of snd_pcm_stream_lock_irq().
 156  */
 157 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 158 {
 159         snd_pcm_group_unlock_irq(&substream->self_group,
 160                                  substream->pcm->nonatomic);
 161 }
 162 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
 163
 164 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
 165 {
 166         unsigned long flags = 0;
 167         if (substream->pcm->nonatomic)
 168                 mutex_lock(&substream->self_group.mutex);
 169         else
 170                 spin_lock_irqsave(&substream->self_group.lock, flags);
 171         return flags;
 172 }
 173 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
 174
 175 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
 176 {
 177         unsigned long flags = 0;
 178         if (substream->pcm->nonatomic)
 179                 mutex_lock_nested(&substream->self_group.mutex,
 180                                   SINGLE_DEPTH_NESTING);
 181         else
 182                 spin_lock_irqsave_nested(&substream->self_group.lock, flags,
 183                                          SINGLE_DEPTH_NESTING);
 184         return flags;
 185 }
 186 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
 187
 188 /**
 189  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
 190  * @substream: PCM substream
 191  * @flags: irq flags
 192  *
 193  * This is a counter-part of snd_pcm_stream_lock_irqsave().
 194  */
 195 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 196                                       unsigned long flags)
 197 {
 198         if (substream->pcm->nonatomic)
 199                 mutex_unlock(&substream->self_group.mutex);
 200         else
 201                 spin_unlock_irqrestore(&substream->self_group.lock, flags);
 202 }
 203 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
 204
 205 /* Run PCM ioctl ops */
 206 static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
 207                              unsigned cmd, void *arg)
 208 {
 209         if (substream->ops->ioctl)
 210                 return substream->ops->ioctl(substream, cmd, arg);
 211         else
 212                 return snd_pcm_lib_ioctl(substream, cmd, arg);
 213 }
 214
 215 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
 216 {
 217         struct snd_pcm *pcm = substream->pcm;
 218         struct snd_pcm_str *pstr = substream->pstr;
 219
 220         memset(info, 0, sizeof(*info));
 221         info->card = pcm->card->number;
 222         info->device = pcm->device;
 223         info->stream = substream->stream;
 224         info->subdevice = substream->number;
 225         strscpy(info->id, pcm->id, sizeof(info->id));
 226         strscpy(info->name, pcm->name, sizeof(info->name));
 227         info->dev_class = pcm->dev_class;
 228         info->dev_subclass = pcm->dev_subclass;
 229         info->subdevices_count = pstr->substream_count;
 230         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 231         strscpy(info->subname, substream->name, sizeof(info->subname));
 232
 233         return 0;
 234 }
 235
 236 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 237                       struct snd_pcm_info __user * _info)
 238 {
 239         struct snd_pcm_info *info __free(kfree) = NULL;
 240         int err;
 241
 242         info = kmalloc(sizeof(*info), GFP_KERNEL);
 243         if (! info)
 244                 return -ENOMEM;
 245         err = snd_pcm_info(substream, info);
 246         if (err >= 0) {
 247                 if (copy_to_user(_info, info, sizeof(*info)))
 248                         err = -EFAULT;
 249         }
 250         return err;
 251 }
 252
 253 /* macro for simplified cast */
 254 #define PARAM_MASK_BIT(b)       (1U << (__force int)(b))
 255
 256 static bool hw_support_mmap(struct snd_pcm_substream *substream)
 257 {
 258         struct snd_dma_buffer *dmabuf;
 259
 260         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 261                 return false;
 262
 263         if (substream->ops->mmap || substream->ops->page)
 264                 return true;
 265
 266         dmabuf = snd_pcm_get_dma_buf(substream);
 267         if (!dmabuf)
 268                 dmabuf = &substream->dma_buffer;
 269         switch (dmabuf->dev.type) {
 270         case SNDRV_DMA_TYPE_UNKNOWN:
 271                 /* we can't know the device, so just assume that the driver does
 272                  * everything right
 273                  */
 274                 return true;
 275         case SNDRV_DMA_TYPE_CONTINUOUS:
 276         case SNDRV_DMA_TYPE_VMALLOC:
 277                 return true;
 278         default:
 279                 return dma_can_mmap(dmabuf->dev.dev);
 280         }
 281 }
 282
 283 static int constrain_mask_params(struct snd_pcm_substream *substream,
 284                                  struct snd_pcm_hw_params *params)
 285 {
 286         struct snd_pcm_hw_constraints *constrs =
 287                                         &substream->runtime->hw_constraints;
 288         struct snd_mask *m;
 289         unsigned int k;
 290         struct snd_mask old_mask __maybe_unused;
 291         int changed;
 292
 293         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 294                 m = hw_param_mask(params, k);
 295                 if (snd_mask_empty(m))
 296                         return -EINVAL;
 297
 298                 /* This parameter is not requested to change by a caller. */
 299                 if (!(params->rmask & PARAM_MASK_BIT(k)))
 300                         continue;
 301
 302                 if (trace_hw_mask_param_enabled())
 303                         old_mask = *m;
 304
 305                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 306                 if (changed < 0)
 307                         return changed;
 308                 if (changed == 0)
 309                         continue;
 310
 311                 /* Set corresponding flag so that the caller gets it. */
 312                 trace_hw_mask_param(substream, k, 0, &old_mask, m);
 313                 params->cmask |= PARAM_MASK_BIT(k);
 314         }
 315
 316         return 0;
 317 }
 318
 319 static int constrain_interval_params(struct snd_pcm_substream *substream,
 320                                      struct snd_pcm_hw_params *params)
 321 {
 322         struct snd_pcm_hw_constraints *constrs =
 323                                         &substream->runtime->hw_constraints;
 324         struct snd_interval *i;
 325         unsigned int k;
 326         struct snd_interval old_interval __maybe_unused;
 327         int changed;
 328
 329         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 330                 i = hw_param_interval(params, k);
 331                 if (snd_interval_empty(i))
 332                         return -EINVAL;
 333
 334                 /* This parameter is not requested to change by a caller. */
 335                 if (!(params->rmask & PARAM_MASK_BIT(k)))
 336                         continue;
 337
 338                 if (trace_hw_interval_param_enabled())
 339                         old_interval = *i;
 340
 341                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 342                 if (changed < 0)
 343                         return changed;
 344                 if (changed == 0)
 345                         continue;
 346
 347                 /* Set corresponding flag so that the caller gets it. */
 348                 trace_hw_interval_param(substream, k, 0, &old_interval, i);
 349                 params->cmask |= PARAM_MASK_BIT(k);
 350         }
 351
 352         return 0;
 353 }
 354
 355 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
 356                                      struct snd_pcm_hw_params *params)
 357 {
 358         struct snd_pcm_hw_constraints *constrs =
 359                                         &substream->runtime->hw_constraints;
 360         unsigned int k;
 361         unsigned int *rstamps __free(kfree) = NULL;
 362         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 363         unsigned int stamp;
 364         struct snd_pcm_hw_rule *r;
 365         unsigned int d;
 366         struct snd_mask old_mask __maybe_unused;
 367         struct snd_interval old_interval __maybe_unused;
 368         bool again;
 369         int changed, err = 0;
 370
 371         /*
 372          * Each application of rule has own sequence number.
 373          *
 374          * Each member of 'rstamps' array represents the sequence number of
 375          * recent application of corresponding rule.
 376          */
 377         rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
 378         if (!rstamps)
 379                 return -ENOMEM;
 380
 381         /*
 382          * Each member of 'vstamps' array represents the sequence number of
 383          * recent application of rule in which corresponding parameters were
 384          * changed.
 385          *
 386          * In initial state, elements corresponding to parameters requested by
 387          * a caller is 1. For unrequested parameters, corresponding members
 388          * have 0 so that the parameters are never changed anymore.
 389          */
 390         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 391                 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
 392
 393         /* Due to the above design, actual sequence number starts at 2. */
 394         stamp = 2;
 395 retry:
 396         /* Apply all rules in order. */
 397         again = false;
 398         for (k = 0; k < constrs->rules_num; k++) {
 399                 r = &constrs->rules[k];
 400
 401                 /*
 402                  * Check condition bits of this rule. When the rule has
 403                  * some condition bits, parameter without the bits is
 404                  * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
 405                  * is an example of the condition bits.
 406                  */
 407                 if (r->cond && !(r->cond & params->flags))
 408                         continue;
 409
 410                 /*
 411                  * The 'deps' array includes maximum four dependencies
 412                  * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
 413                  * member of this array is a sentinel and should be
 414                  * negative value.
 415                  *
 416                  * This rule should be processed in this time when dependent
 417                  * parameters were changed at former applications of the other
 418                  * rules.
 419                  */
 420                 for (d = 0; r->deps[d] >= 0; d++) {
 421                         if (vstamps[r->deps[d]] > rstamps[k])
 422                                 break;
 423                 }
 424                 if (r->deps[d] < 0)
 425                         continue;
 426
 427                 if (trace_hw_mask_param_enabled()) {
 428                         if (hw_is_mask(r->var))
 429                                 old_mask = *hw_param_mask(params, r->var);
 430                 }
 431                 if (trace_hw_interval_param_enabled()) {
 432                         if (hw_is_interval(r->var))
 433                                 old_interval = *hw_param_interval(params, r->var);
 434                 }
 435
 436                 changed = r->func(params, r);
 437                 if (changed < 0)
 438                         return changed;
 439
 440                 /*
 441                  * When the parameter is changed, notify it to the caller
 442                  * by corresponding returned bit, then preparing for next
 443                  * iteration.
 444                  */
 445                 if (changed && r->var >= 0) {
 446                         if (hw_is_mask(r->var)) {
 447                                 trace_hw_mask_param(substream, r->var,
 448                                         k + 1, &old_mask,
 449                                         hw_param_mask(params, r->var));
 450                         }
 451                         if (hw_is_interval(r->var)) {
 452                                 trace_hw_interval_param(substream, r->var,
 453                                         k + 1, &old_interval,
 454                                         hw_param_interval(params, r->var));
 455                         }
 456
 457                         params->cmask |= PARAM_MASK_BIT(r->var);
 458                         vstamps[r->var] = stamp;
 459                         again = true;
 460                 }
 461
 462                 rstamps[k] = stamp++;
 463         }
 464
 465         /* Iterate to evaluate all rules till no parameters are changed. */
 466         if (again)
 467                 goto retry;
 468
 469         return err;
 470 }
 471
 472 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
 473                                      struct snd_pcm_hw_params *params)
 474 {
 475         const struct snd_interval *i;
 476         const struct snd_mask *m;
 477         struct snd_mask *m_rw;
 478         int err;
 479
 480         if (!params->msbits) {
 481                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 482                 if (snd_interval_single(i))
 483                         params->msbits = snd_interval_value(i);
 484                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 485                 if (snd_mask_single(m)) {
 486                         snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
 487                         params->msbits = snd_pcm_format_width(format);
 488                 }
 489         }
 490
 491         if (params->msbits) {
 492                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 493                 if (snd_mask_single(m)) {
 494                         snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
 495
 496                         if (snd_pcm_format_linear(format) &&
 497                             snd_pcm_format_width(format) != params->msbits) {
 498                                 m_rw = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
 499                                 snd_mask_reset(m_rw,
 500                                                (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
 501                                 if (snd_mask_empty(m_rw))
 502                                         return -EINVAL;
 503                         }
 504                 }
 505         }
 506
 507         if (!params->rate_den) {
 508                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 509                 if (snd_interval_single(i)) {
 510                         params->rate_num = snd_interval_value(i);
 511                         params->rate_den = 1;
 512                 }
 513         }
 514
 515         if (!params->fifo_size) {
 516                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
 517                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 518                 if (snd_mask_single(m) && snd_interval_single(i)) {
 519                         err = snd_pcm_ops_ioctl(substream,
 520                                                 SNDRV_PCM_IOCTL1_FIFO_SIZE,
 521                                                 params);
 522                         if (err < 0)
 523                                 return err;
 524                 }
 525         }
 526
 527         if (!params->info) {
 528                 params->info = substream->runtime->hw.info;
 529                 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
 530                                   SNDRV_PCM_INFO_DRAIN_TRIGGER);
 531                 if (!hw_support_mmap(substream))
 532                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
 533                                           SNDRV_PCM_INFO_MMAP_VALID);
 534         }
 535
 536         err = snd_pcm_ops_ioctl(substream,
 537                                 SNDRV_PCM_IOCTL1_SYNC_ID,
 538                                 params);
 539         if (err < 0)
 540                 return err;
 541
 542         return 0;
 543 }
 544
 545 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 546                       struct snd_pcm_hw_params *params)
 547 {
 548         int err;
 549
 550         params->info = 0;
 551         params->fifo_size = 0;
 552         if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 553                 params->msbits = 0;
 554         if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
 555                 params->rate_num = 0;
 556                 params->rate_den = 0;
 557         }
 558
 559         err = constrain_mask_params(substream, params);
 560         if (err < 0)
 561                 return err;
 562
 563         err = constrain_interval_params(substream, params);
 564         if (err < 0)
 565                 return err;
 566
 567         err = constrain_params_by_rules(substream, params);
 568         if (err < 0)
 569                 return err;
 570
 571         params->rmask = 0;
 572
 573         return 0;
 574 }
 575 EXPORT_SYMBOL(snd_pcm_hw_refine);
 576
 577 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 578                                   struct snd_pcm_hw_params __user * _params)
 579 {
 580         struct snd_pcm_hw_params *params __free(kfree) = NULL;
 581         int err;
 582
 583         params = memdup_user(_params, sizeof(*params));
 584         if (IS_ERR(params))
 585                 return PTR_ERR(params);
 586
 587         err = snd_pcm_hw_refine(substream, params);
 588         if (err < 0)
 589                 return err;
 590
 591         err = fixup_unreferenced_params(substream, params);
 592         if (err < 0)
 593                 return err;
 594
 595         if (copy_to_user(_params, params, sizeof(*params)))
 596                 return -EFAULT;
 597         return 0;
 598 }
 599
 600 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 601 {
 602         int usecs;
 603
 604         if (! runtime->rate)
 605                 return -1; /* invalid */
 606
 607         /* take 75% of period time as the deadline */
 608         usecs = (750000 / runtime->rate) * runtime->period_size;
 609         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 610                 runtime->rate;
 611
 612         return usecs;
 613 }
 614
 615 static void snd_pcm_set_state(struct snd_pcm_substream *substream,
 616                               snd_pcm_state_t state)
 617 {
 618         guard(pcm_stream_lock_irq)(substream);
 619         if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
 620                 __snd_pcm_set_state(substream->runtime, state);
 621 }
 622
 623 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
 624                                         int event)
 625 {
 626 #ifdef CONFIG_SND_PCM_TIMER
 627         if (substream->timer)
 628                 snd_timer_notify(substream->timer, event,
 629                                         &substream->runtime->trigger_tstamp);
 630 #endif
 631 }
 632
 633 void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
 634 {
 635         if (substream->runtime && substream->runtime->stop_operating) {
 636                 substream->runtime->stop_operating = false;
 637                 if (substream->ops && substream->ops->sync_stop)
 638                         substream->ops->sync_stop(substream);
 639                 else if (sync_irq && substream->pcm->card->sync_irq > 0)
 640                         synchronize_irq(substream->pcm->card->sync_irq);
 641         }
 642 }
 643
 644 /**
 645  * snd_pcm_hw_params_choose - choose a configuration defined by @params
 646  * @pcm: PCM instance
 647  * @params: the hw_params instance
 648  *
 649  * Choose one configuration from configuration space defined by @params.
 650  * The configuration chosen is that obtained fixing in this order:
 651  * first access, first format, first subformat, min channels,
 652  * min rate, min period time, max buffer size, min tick time
 653  *
 654  * Return: Zero if successful, or a negative error code on failure.
 655  */
 656 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
 657                                     struct snd_pcm_hw_params *params)
 658 {
 659         static const int vars[] = {
 660                 SNDRV_PCM_HW_PARAM_ACCESS,
 661                 SNDRV_PCM_HW_PARAM_FORMAT,
 662                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
 663                 SNDRV_PCM_HW_PARAM_CHANNELS,
 664                 SNDRV_PCM_HW_PARAM_RATE,
 665                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 666                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 667                 SNDRV_PCM_HW_PARAM_TICK_TIME,
 668                 -1
 669         };
 670         const int *v;
 671         struct snd_mask old_mask __maybe_unused;
 672         struct snd_interval old_interval __maybe_unused;
 673         int changed;
 674
 675         for (v = vars; *v != -1; v++) {
 676                 /* Keep old parameter to trace. */
 677                 if (trace_hw_mask_param_enabled()) {
 678                         if (hw_is_mask(*v))
 679                                 old_mask = *hw_param_mask(params, *v);
 680                 }
 681                 if (trace_hw_interval_param_enabled()) {
 682                         if (hw_is_interval(*v))
 683                                 old_interval = *hw_param_interval(params, *v);
 684                 }
 685                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
 686                         changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
 687                 else
 688                         changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
 689                 if (changed < 0)
 690                         return changed;
 691                 if (changed == 0)
 692                         continue;
 693
 694                 /* Trace the changed parameter. */
 695                 if (hw_is_mask(*v)) {
 696                         trace_hw_mask_param(pcm, *v, 0, &old_mask,
 697                                             hw_param_mask(params, *v));
 698                 }
 699                 if (hw_is_interval(*v)) {
 700                         trace_hw_interval_param(pcm, *v, 0, &old_interval,
 701                                                 hw_param_interval(params, *v));
 702                 }
 703         }
 704
 705         return 0;
 706 }
 707
 708 /* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
 709  * block the further r/w operations
 710  */
 711 static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
 712 {
 713         if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
 714                 return -EBUSY;
 715         mutex_lock(&runtime->buffer_mutex);
 716         return 0; /* keep buffer_mutex, unlocked by below */
 717 }
 718
 719 /* release buffer_mutex and clear r/w access flag */
 720 static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
 721 {
 722         mutex_unlock(&runtime->buffer_mutex);
 723         atomic_inc(&runtime->buffer_accessing);
 724 }
 725
 726 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 727 #define is_oss_stream(substream)        ((substream)->oss.oss)
 728 #else
 729 #define is_oss_stream(substream)        false
 730 #endif
 731
 732 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 733                              struct snd_pcm_hw_params *params)
 734 {
 735         struct snd_pcm_runtime *runtime;
 736         int err, usecs;
 737         unsigned int bits;
 738         snd_pcm_uframes_t frames;
 739
 740         if (PCM_RUNTIME_CHECK(substream))
 741                 return -ENXIO;
 742         runtime = substream->runtime;
 743         err = snd_pcm_buffer_access_lock(runtime);
 744         if (err < 0)
 745                 return err;
 746         scoped_guard(pcm_stream_lock_irq, substream) {
 747                 switch (runtime->state) {
 748                 case SNDRV_PCM_STATE_OPEN:
 749                 case SNDRV_PCM_STATE_SETUP:
 750                 case SNDRV_PCM_STATE_PREPARED:
 751                         if (!is_oss_stream(substream) &&
 752                             atomic_read(&substream->mmap_count))
 753                                 err = -EBADFD;
 754                         break;
 755                 default:
 756                         err = -EBADFD;
 757                         break;
 758                 }
 759         }
 760         if (err)
 761                 goto unlock;
 762
 763         snd_pcm_sync_stop(substream, true);
 764
 765         params->rmask = ~0U;
 766         err = snd_pcm_hw_refine(substream, params);
 767         if (err < 0)
 768                 goto _error;
 769
 770         err = snd_pcm_hw_params_choose(substream, params);
 771         if (err < 0)
 772                 goto _error;
 773
 774         err = fixup_unreferenced_params(substream, params);
 775         if (err < 0)
 776                 goto _error;
 777
 778         if (substream->managed_buffer_alloc) {
 779                 err = snd_pcm_lib_malloc_pages(substream,
 780                                                params_buffer_bytes(params));
 781                 if (err < 0)
 782                         goto _error;
 783                 runtime->buffer_changed = err > 0;
 784         }
 785
 786         if (substream->ops->hw_params != NULL) {
 787                 err = substream->ops->hw_params(substream, params);
 788                 if (err < 0)
 789                         goto _error;
 790         }
 791
 792         runtime->access = params_access(params);
 793         runtime->format = params_format(params);
 794         runtime->subformat = params_subformat(params);
 795         runtime->channels = params_channels(params);
 796         runtime->rate = params_rate(params);
 797         runtime->period_size = params_period_size(params);
 798         runtime->periods = params_periods(params);
 799         runtime->buffer_size = params_buffer_size(params);
 800         runtime->info = params->info;
 801         runtime->rate_num = params->rate_num;
 802         runtime->rate_den = params->rate_den;
 803         runtime->no_period_wakeup =
 804                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 805                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 806
 807         bits = snd_pcm_format_physical_width(runtime->format);
 808         runtime->sample_bits = bits;
 809         bits *= runtime->channels;
 810         runtime->frame_bits = bits;
 811         frames = 1;
 812         while (bits % 8 != 0) {
 813                 bits *= 2;
 814                 frames *= 2;
 815         }
 816         runtime->byte_align = bits / 8;
 817         runtime->min_align = frames;
 818
 819         /* Default sw params */
 820         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 821         runtime->period_step = 1;
 822         runtime->control->avail_min = runtime->period_size;
 823         runtime->start_threshold = 1;
 824         runtime->stop_threshold = runtime->buffer_size;
 825         runtime->silence_threshold = 0;
 826         runtime->silence_size = 0;
 827         runtime->boundary = runtime->buffer_size;
 828         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 829                 runtime->boundary *= 2;
 830
 831         /* clear the buffer for avoiding possible kernel info leaks */
 832         if (runtime->dma_area && !substream->ops->copy) {
 833                 size_t size = runtime->dma_bytes;
 834
 835                 if (runtime->info & SNDRV_PCM_INFO_MMAP)
 836                         size = PAGE_ALIGN(size);
 837                 memset(runtime->dma_area, 0, size);
 838         }
 839
 840         snd_pcm_timer_resolution_change(substream);
 841         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 842
 843         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
 844                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
 845         usecs = period_to_usecs(runtime);
 846         if (usecs >= 0)
 847                 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
 848                                             usecs);
 849         err = 0;
 850  _error:
 851         if (err) {
 852                 /* hardware might be unusable from this time,
 853                  * so we force application to retry to set
 854                  * the correct hardware parameter settings
 855                  */
 856                 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 857                 if (substream->ops->hw_free != NULL)
 858                         substream->ops->hw_free(substream);
 859                 if (substream->managed_buffer_alloc)
 860                         snd_pcm_lib_free_pages(substream);
 861         }
 862  unlock:
 863         snd_pcm_buffer_access_unlock(runtime);
 864         return err;
 865 }
 866
 867 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 868                                   struct snd_pcm_hw_params __user * _params)
 869 {
 870         struct snd_pcm_hw_params *params __free(kfree) = NULL;
 871         int err;
 872
 873         params = memdup_user(_params, sizeof(*params));
 874         if (IS_ERR(params))
 875                 return PTR_ERR(params);
 876
 877         err = snd_pcm_hw_params(substream, params);
 878         if (err < 0)
 879                 return err;
 880
 881         if (copy_to_user(_params, params, sizeof(*params)))
 882                 return -EFAULT;
 883         return err;
 884 }
 885
 886 static int do_hw_free(struct snd_pcm_substream *substream)
 887 {
 888         int result = 0;
 889
 890         snd_pcm_sync_stop(substream, true);
 891         if (substream->ops->hw_free)
 892                 result = substream->ops->hw_free(substream);
 893         if (substream->managed_buffer_alloc)
 894                 snd_pcm_lib_free_pages(substream);
 895         return result;
 896 }
 897
 898 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 899 {
 900         struct snd_pcm_runtime *runtime;
 901         int result = 0;
 902
 903         if (PCM_RUNTIME_CHECK(substream))
 904                 return -ENXIO;
 905         runtime = substream->runtime;
 906         result = snd_pcm_buffer_access_lock(runtime);
 907         if (result < 0)
 908                 return result;
 909         scoped_guard(pcm_stream_lock_irq, substream) {
 910                 switch (runtime->state) {
 911                 case SNDRV_PCM_STATE_SETUP:
 912                 case SNDRV_PCM_STATE_PREPARED:
 913                         if (atomic_read(&substream->mmap_count))
 914                                 result = -EBADFD;
 915                         break;
 916                 default:
 917                         result = -EBADFD;
 918                         break;
 919                 }
 920         }
 921         if (result)
 922                 goto unlock;
 923         result = do_hw_free(substream);
 924         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 925         cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
 926  unlock:
 927         snd_pcm_buffer_access_unlock(runtime);
 928         return result;
 929 }
 930
 931 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 932                              struct snd_pcm_sw_params *params)
 933 {
 934         struct snd_pcm_runtime *runtime;
 935         int err;
 936
 937         if (PCM_RUNTIME_CHECK(substream))
 938                 return -ENXIO;
 939         runtime = substream->runtime;
 940         scoped_guard(pcm_stream_lock_irq, substream) {
 941                 if (runtime->state == SNDRV_PCM_STATE_OPEN)
 942                         return -EBADFD;
 943         }
 944
 945         if (params->tstamp_mode < 0 ||
 946             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 947                 return -EINVAL;
 948         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
 949             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
 950                 return -EINVAL;
 951         if (params->avail_min == 0)
 952                 return -EINVAL;
 953         if (params->silence_size >= runtime->boundary) {
 954                 if (params->silence_threshold != 0)
 955                         return -EINVAL;
 956         } else {
 957                 if (params->silence_size > params->silence_threshold)
 958                         return -EINVAL;
 959                 if (params->silence_threshold > runtime->buffer_size)
 960                         return -EINVAL;
 961         }
 962         err = 0;
 963         scoped_guard(pcm_stream_lock_irq, substream) {
 964                 runtime->tstamp_mode = params->tstamp_mode;
 965                 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
 966                         runtime->tstamp_type = params->tstamp_type;
 967                 runtime->period_step = params->period_step;
 968                 runtime->control->avail_min = params->avail_min;
 969                 runtime->start_threshold = params->start_threshold;
 970                 runtime->stop_threshold = params->stop_threshold;
 971                 runtime->silence_threshold = params->silence_threshold;
 972                 runtime->silence_size = params->silence_size;
 973                 params->boundary = runtime->boundary;
 974                 if (snd_pcm_running(substream)) {
 975                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 976                             runtime->silence_size > 0)
 977                                 snd_pcm_playback_silence(substream, ULONG_MAX);
 978                         err = snd_pcm_update_state(substream, runtime);
 979                 }
 980         }
 981         return err;
 982 }
 983
 984 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 985                                   struct snd_pcm_sw_params __user * _params)
 986 {
 987         struct snd_pcm_sw_params params;
 988         int err;
 989         if (copy_from_user(&params, _params, sizeof(params)))
 990                 return -EFAULT;
 991         err = snd_pcm_sw_params(substream, &params);
 992         if (copy_to_user(_params, &params, sizeof(params)))
 993                 return -EFAULT;
 994         return err;
 995 }
 996
 997 static inline snd_pcm_uframes_t
 998 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
 999 {
1000         snd_pcm_uframes_t delay;
1001
1002         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1003                 delay = snd_pcm_playback_hw_avail(substream->runtime);
1004         else
1005                 delay = snd_pcm_capture_avail(substream->runtime);
1006         return delay + substream->runtime->delay;
1007 }
1008
1009 int snd_pcm_status64(struct snd_pcm_substream *substream,
1010                      struct snd_pcm_status64 *status)
1011 {
1012         struct snd_pcm_runtime *runtime = substream->runtime;
1013
1014         guard(pcm_stream_lock_irq)(substream);
1015
1016         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1017                                         &runtime->audio_tstamp_config);
1018
1019         /* backwards compatible behavior */
1020         if (runtime->audio_tstamp_config.type_requested ==
1021                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1022                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1023                         runtime->audio_tstamp_config.type_requested =
1024                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1025                 else
1026                         runtime->audio_tstamp_config.type_requested =
1027                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1028                 runtime->audio_tstamp_report.valid = 0;
1029         } else
1030                 runtime->audio_tstamp_report.valid = 1;
1031
1032         status->state = runtime->state;
1033         status->suspended_state = runtime->suspended_state;
1034         if (status->state == SNDRV_PCM_STATE_OPEN)
1035                 return 0;
1036         status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1037         status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1038         if (snd_pcm_running(substream)) {
1039                 snd_pcm_update_hw_ptr(substream);
1040                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1041                         status->tstamp_sec = runtime->status->tstamp.tv_sec;
1042                         status->tstamp_nsec =
1043                                 runtime->status->tstamp.tv_nsec;
1044                         status->driver_tstamp_sec =
1045                                 runtime->driver_tstamp.tv_sec;
1046                         status->driver_tstamp_nsec =
1047                                 runtime->driver_tstamp.tv_nsec;
1048                         status->audio_tstamp_sec =
1049                                 runtime->status->audio_tstamp.tv_sec;
1050                         status->audio_tstamp_nsec =
1051                                 runtime->status->audio_tstamp.tv_nsec;
1052                         if (runtime->audio_tstamp_report.valid == 1)
1053                                 /* backwards compatibility, no report provided in COMPAT mode */
1054                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1055                                                                 &status->audio_tstamp_accuracy,
1056                                                                 &runtime->audio_tstamp_report);
1057
1058                         goto _tstamp_end;
1059                 }
1060         } else {
1061                 /* get tstamp only in fallback mode and only if enabled */
1062                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1063                         struct timespec64 tstamp;
1064
1065                         snd_pcm_gettime(runtime, &tstamp);
1066                         status->tstamp_sec = tstamp.tv_sec;
1067                         status->tstamp_nsec = tstamp.tv_nsec;
1068                 }
1069         }
1070  _tstamp_end:
1071         status->appl_ptr = runtime->control->appl_ptr;
1072         status->hw_ptr = runtime->status->hw_ptr;
1073         status->avail = snd_pcm_avail(substream);
1074         status->delay = snd_pcm_running(substream) ?
1075                 snd_pcm_calc_delay(substream) : 0;
1076         status->avail_max = runtime->avail_max;
1077         status->overrange = runtime->overrange;
1078         runtime->avail_max = 0;
1079         runtime->overrange = 0;
1080         return 0;
1081 }
1082
1083 static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1084                                  struct snd_pcm_status64 __user * _status,
1085                                  bool ext)
1086 {
1087         struct snd_pcm_status64 status;
1088         int res;
1089
1090         memset(&status, 0, sizeof(status));
1091         /*
1092          * with extension, parameters are read/write,
1093          * get audio_tstamp_data from user,
1094          * ignore rest of status structure
1095          */
1096         if (ext && get_user(status.audio_tstamp_data,
1097                                 (u32 __user *)(&_status->audio_tstamp_data)))
1098                 return -EFAULT;
1099         res = snd_pcm_status64(substream, &status);
1100         if (res < 0)
1101                 return res;
1102         if (copy_to_user(_status, &status, sizeof(status)))
1103                 return -EFAULT;
1104         return 0;
1105 }
1106
1107 static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1108                                  struct snd_pcm_status32 __user * _status,
1109                                  bool ext)
1110 {
1111         struct snd_pcm_status64 status64;
1112         struct snd_pcm_status32 status32;
1113         int res;
1114
1115         memset(&status64, 0, sizeof(status64));
1116         memset(&status32, 0, sizeof(status32));
1117         /*
1118          * with extension, parameters are read/write,
1119          * get audio_tstamp_data from user,
1120          * ignore rest of status structure
1121          */
1122         if (ext && get_user(status64.audio_tstamp_data,
1123                             (u32 __user *)(&_status->audio_tstamp_data)))
1124                 return -EFAULT;
1125         res = snd_pcm_status64(substream, &status64);
1126         if (res < 0)
1127                 return res;
1128
1129         status32 = (struct snd_pcm_status32) {
1130                 .state = status64.state,
1131                 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1132                 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1133                 .tstamp_sec = status64.tstamp_sec,
1134                 .tstamp_nsec = status64.tstamp_nsec,
1135                 .appl_ptr = status64.appl_ptr,
1136                 .hw_ptr = status64.hw_ptr,
1137                 .delay = status64.delay,
1138                 .avail = status64.avail,
1139                 .avail_max = status64.avail_max,
1140                 .overrange = status64.overrange,
1141                 .suspended_state = status64.suspended_state,
1142                 .audio_tstamp_data = status64.audio_tstamp_data,
1143                 .audio_tstamp_sec = status64.audio_tstamp_sec,
1144                 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1145                 .driver_tstamp_sec = status64.audio_tstamp_sec,
1146                 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1147                 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1148         };
1149
1150         if (copy_to_user(_status, &status32, sizeof(status32)))
1151                 return -EFAULT;
1152
1153         return 0;
1154 }
1155
1156 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1157                                 struct snd_pcm_channel_info * info)
1158 {
1159         struct snd_pcm_runtime *runtime;
1160         unsigned int channel;
1161
1162         channel = info->channel;
1163         runtime = substream->runtime;
1164         scoped_guard(pcm_stream_lock_irq, substream) {
1165                 if (runtime->state == SNDRV_PCM_STATE_OPEN)
1166                         return -EBADFD;
1167         }
1168         if (channel >= runtime->channels)
1169                 return -EINVAL;
1170         memset(info, 0, sizeof(*info));
1171         info->channel = channel;
1172         return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1173 }
1174
1175 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1176                                      struct snd_pcm_channel_info __user * _info)
1177 {
1178         struct snd_pcm_channel_info info;
1179         int res;
1180
1181         if (copy_from_user(&info, _info, sizeof(info)))
1182                 return -EFAULT;
1183         res = snd_pcm_channel_info(substream, &info);
1184         if (res < 0)
1185                 return res;
1186         if (copy_to_user(_info, &info, sizeof(info)))
1187                 return -EFAULT;
1188         return 0;
1189 }
1190
1191 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1192 {
1193         struct snd_pcm_runtime *runtime = substream->runtime;
1194         if (runtime->trigger_master == NULL)
1195                 return;
1196         if (runtime->trigger_master == substream) {
1197                 if (!runtime->trigger_tstamp_latched)
1198                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1199         } else {
1200                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1201                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1202         }
1203         runtime->trigger_master = NULL;
1204 }
1205
1206 #define ACTION_ARG_IGNORE       (__force snd_pcm_state_t)0
1207
1208 struct action_ops {
1209         int (*pre_action)(struct snd_pcm_substream *substream,
1210                           snd_pcm_state_t state);
1211         int (*do_action)(struct snd_pcm_substream *substream,
1212                          snd_pcm_state_t state);
1213         void (*undo_action)(struct snd_pcm_substream *substream,
1214                             snd_pcm_state_t state);
1215         void (*post_action)(struct snd_pcm_substream *substream,
1216                             snd_pcm_state_t state);
1217 };
1218
1219 /*
1220  *  this functions is core for handling of linked stream
1221  *  Note: the stream state might be changed also on failure
1222  *  Note2: call with calling stream lock + link lock
1223  */
1224 static int snd_pcm_action_group(const struct action_ops *ops,
1225                                 struct snd_pcm_substream *substream,
1226                                 snd_pcm_state_t state,
1227                                 bool stream_lock)
1228 {
1229         struct snd_pcm_substream *s = NULL;
1230         struct snd_pcm_substream *s1;
1231         int res = 0, depth = 1;
1232
1233         snd_pcm_group_for_each_entry(s, substream) {
1234                 if (s != substream) {
1235                         if (!stream_lock)
1236                                 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1237                         else if (s->pcm->nonatomic)
1238                                 mutex_lock_nested(&s->self_group.mutex, depth);
1239                         else
1240                                 spin_lock_nested(&s->self_group.lock, depth);
1241                         depth++;
1242                 }
1243                 res = ops->pre_action(s, state);
1244                 if (res < 0)
1245                         goto _unlock;
1246         }
1247         snd_pcm_group_for_each_entry(s, substream) {
1248                 res = ops->do_action(s, state);
1249                 if (res < 0) {
1250                         if (ops->undo_action) {
1251                                 snd_pcm_group_for_each_entry(s1, substream) {
1252                                         if (s1 == s) /* failed stream */
1253                                                 break;
1254                                         ops->undo_action(s1, state);
1255                                 }
1256                         }
1257                         s = NULL; /* unlock all */
1258                         goto _unlock;
1259                 }
1260         }
1261         snd_pcm_group_for_each_entry(s, substream) {
1262                 ops->post_action(s, state);
1263         }
1264  _unlock:
1265         /* unlock streams */
1266         snd_pcm_group_for_each_entry(s1, substream) {
1267                 if (s1 != substream) {
1268                         if (!stream_lock)
1269                                 mutex_unlock(&s1->runtime->buffer_mutex);
1270                         else if (s1->pcm->nonatomic)
1271                                 mutex_unlock(&s1->self_group.mutex);
1272                         else
1273                                 spin_unlock(&s1->self_group.lock);
1274                 }
1275                 if (s1 == s)    /* end */
1276                         break;
1277         }
1278         return res;
1279 }
1280
1281 /*
1282  *  Note: call with stream lock
1283  */
1284 static int snd_pcm_action_single(const struct action_ops *ops,
1285                                  struct snd_pcm_substream *substream,
1286                                  snd_pcm_state_t state)
1287 {
1288         int res;
1289
1290         res = ops->pre_action(substream, state);
1291         if (res < 0)
1292                 return res;
1293         res = ops->do_action(substream, state);
1294         if (res == 0)
1295                 ops->post_action(substream, state);
1296         else if (ops->undo_action)
1297                 ops->undo_action(substream, state);
1298         return res;
1299 }
1300
1301 static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1302                                  struct snd_pcm_group *new_group)
1303 {
1304         substream->group = new_group;
1305         list_move(&substream->link_list, &new_group->substreams);
1306 }
1307
1308 /*
1309  * Unref and unlock the group, but keep the stream lock;
1310  * when the group becomes empty and no longer referred, destroy itself
1311  */
1312 static void snd_pcm_group_unref(struct snd_pcm_group *group,
1313                                 struct snd_pcm_substream *substream)
1314 {
1315         bool do_free;
1316
1317         if (!group)
1318                 return;
1319         do_free = refcount_dec_and_test(&group->refs);
1320         snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1321         if (do_free)
1322                 kfree(group);
1323 }
1324
1325 /*
1326  * Lock the group inside a stream lock and reference it;
1327  * return the locked group object, or NULL if not linked
1328  */
1329 static struct snd_pcm_group *
1330 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1331 {
1332         bool nonatomic = substream->pcm->nonatomic;
1333         struct snd_pcm_group *group;
1334         bool trylock;
1335
1336         for (;;) {
1337                 if (!snd_pcm_stream_linked(substream))
1338                         return NULL;
1339                 group = substream->group;
1340                 /* block freeing the group object */
1341                 refcount_inc(&group->refs);
1342
1343                 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1344                         spin_trylock(&group->lock);
1345                 if (trylock)
1346                         break; /* OK */
1347
1348                 /* re-lock for avoiding ABBA deadlock */
1349                 snd_pcm_stream_unlock(substream);
1350                 snd_pcm_group_lock(group, nonatomic);
1351                 snd_pcm_stream_lock(substream);
1352
1353                 /* check the group again; the above opens a small race window */
1354                 if (substream->group == group)
1355                         break; /* OK */
1356                 /* group changed, try again */
1357                 snd_pcm_group_unref(group, substream);
1358         }
1359         return group;
1360 }
1361
1362 /*
1363  *  Note: call with stream lock
1364  */
1365 static int snd_pcm_action(const struct action_ops *ops,
1366                           struct snd_pcm_substream *substream,
1367                           snd_pcm_state_t state)
1368 {
1369         struct snd_pcm_group *group;
1370         int res;
1371
1372         group = snd_pcm_stream_group_ref(substream);
1373         if (group)
1374                 res = snd_pcm_action_group(ops, substream, state, true);
1375         else
1376                 res = snd_pcm_action_single(ops, substream, state);
1377         snd_pcm_group_unref(group, substream);
1378         return res;
1379 }
1380
1381 /*
1382  *  Note: don't use any locks before
1383  */
1384 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1385                                    struct snd_pcm_substream *substream,
1386                                    snd_pcm_state_t state)
1387 {
1388         guard(pcm_stream_lock_irq)(substream);
1389         return snd_pcm_action(ops, substream, state);
1390 }
1391
1392 /*
1393  */
1394 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1395                                     struct snd_pcm_substream *substream,
1396                                     snd_pcm_state_t state)
1397 {
1398         int res;
1399
1400         /* Guarantee the group members won't change during non-atomic action */
1401         guard(rwsem_read)(&snd_pcm_link_rwsem);
1402         res = snd_pcm_buffer_access_lock(substream->runtime);
1403         if (res < 0)
1404                 return res;
1405         if (snd_pcm_stream_linked(substream))
1406                 res = snd_pcm_action_group(ops, substream, state, false);
1407         else
1408                 res = snd_pcm_action_single(ops, substream, state);
1409         snd_pcm_buffer_access_unlock(substream->runtime);
1410         return res;
1411 }
1412
1413 /*
1414  * start callbacks
1415  */
1416 static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1417                              snd_pcm_state_t state)
1418 {
1419         struct snd_pcm_runtime *runtime = substream->runtime;
1420         if (runtime->state != SNDRV_PCM_STATE_PREPARED)
1421                 return -EBADFD;
1422         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1423             !snd_pcm_playback_data(substream))
1424                 return -EPIPE;
1425         runtime->trigger_tstamp_latched = false;
1426         runtime->trigger_master = substream;
1427         return 0;
1428 }
1429
1430 static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1431                             snd_pcm_state_t state)
1432 {
1433         int err;
1434
1435         if (substream->runtime->trigger_master != substream)
1436                 return 0;
1437         err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1438         /* XRUN happened during the start */
1439         if (err == -EPIPE)
1440                 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN);
1441         return err;
1442 }
1443
1444 static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1445                                snd_pcm_state_t state)
1446 {
1447         if (substream->runtime->trigger_master == substream) {
1448                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1449                 substream->runtime->stop_operating = true;
1450         }
1451 }
1452
1453 static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1454                                snd_pcm_state_t state)
1455 {
1456         struct snd_pcm_runtime *runtime = substream->runtime;
1457         snd_pcm_trigger_tstamp(substream);
1458         runtime->hw_ptr_jiffies = jiffies;
1459         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1460                                                             runtime->rate;
1461         __snd_pcm_set_state(runtime, state);
1462         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1463             runtime->silence_size > 0)
1464                 snd_pcm_playback_silence(substream, ULONG_MAX);
1465         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1466 }
1467
1468 static const struct action_ops snd_pcm_action_start = {
1469         .pre_action = snd_pcm_pre_start,
1470         .do_action = snd_pcm_do_start,
1471         .undo_action = snd_pcm_undo_start,
1472         .post_action = snd_pcm_post_start
1473 };
1474
1475 /**
1476  * snd_pcm_start - start all linked streams
1477  * @substream: the PCM substream instance
1478  *
1479  * Return: Zero if successful, or a negative error code.
1480  * The stream lock must be acquired before calling this function.
1481  */
1482 int snd_pcm_start(struct snd_pcm_substream *substream)
1483 {
1484         return snd_pcm_action(&snd_pcm_action_start, substream,
1485                               SNDRV_PCM_STATE_RUNNING);
1486 }
1487
1488 /* take the stream lock and start the streams */
1489 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1490 {
1491         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1492                                        SNDRV_PCM_STATE_RUNNING);
1493 }
1494
1495 /*
1496  * stop callbacks
1497  */
1498 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1499                             snd_pcm_state_t state)
1500 {
1501         struct snd_pcm_runtime *runtime = substream->runtime;
1502         if (runtime->state == SNDRV_PCM_STATE_OPEN)
1503                 return -EBADFD;
1504         runtime->trigger_master = substream;
1505         return 0;
1506 }
1507
1508 static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1509                            snd_pcm_state_t state)
1510 {
1511         if (substream->runtime->trigger_master == substream &&
1512             snd_pcm_running(substream)) {
1513                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1514                 substream->runtime->stop_operating = true;
1515         }
1516         return 0; /* unconditionally stop all substreams */
1517 }
1518
1519 static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1520                               snd_pcm_state_t state)
1521 {
1522         struct snd_pcm_runtime *runtime = substream->runtime;
1523         if (runtime->state != state) {
1524                 snd_pcm_trigger_tstamp(substream);
1525                 __snd_pcm_set_state(runtime, state);
1526                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1527         }
1528         wake_up(&runtime->sleep);
1529         wake_up(&runtime->tsleep);
1530 }
1531
1532 static const struct action_ops snd_pcm_action_stop = {
1533         .pre_action = snd_pcm_pre_stop,
1534         .do_action = snd_pcm_do_stop,
1535         .post_action = snd_pcm_post_stop
1536 };
1537
1538 /**
1539  * snd_pcm_stop - try to stop all running streams in the substream group
1540  * @substream: the PCM substream instance
1541  * @state: PCM state after stopping the stream
1542  *
1543  * The state of each stream is then changed to the given state unconditionally.
1544  *
1545  * Return: Zero if successful, or a negative error code.
1546  */
1547 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1548 {
1549         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1550 }
1551 EXPORT_SYMBOL(snd_pcm_stop);
1552
1553 /**
1554  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1555  * @substream: the PCM substream
1556  *
1557  * After stopping, the state is changed to SETUP.
1558  * Unlike snd_pcm_stop(), this affects only the given stream.
1559  *
1560  * Return: Zero if successful, or a negative error code.
1561  */
1562 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1563 {
1564         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1565                                      SNDRV_PCM_STATE_SETUP);
1566 }
1567
1568 /**
1569  * snd_pcm_stop_xrun - stop the running streams as XRUN
1570  * @substream: the PCM substream instance
1571  *
1572  * This stops the given running substream (and all linked substreams) as XRUN.
1573  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1574  *
1575  * Return: Zero if successful, or a negative error code.
1576  */
1577 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1578 {
1579         guard(pcm_stream_lock_irqsave)(substream);
1580         if (substream->runtime && snd_pcm_running(substream))
1581                 __snd_pcm_xrun(substream);
1582         return 0;
1583 }
1584 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1585
1586 /*
1587  * pause callbacks: pass boolean (to start pause or resume) as state argument
1588  */
1589 #define pause_pushed(state)     (__force bool)(state)
1590
1591 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1592                              snd_pcm_state_t state)
1593 {
1594         struct snd_pcm_runtime *runtime = substream->runtime;
1595         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1596                 return -ENOSYS;
1597         if (pause_pushed(state)) {
1598                 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1599                         return -EBADFD;
1600         } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1601                 return -EBADFD;
1602         runtime->trigger_master = substream;
1603         return 0;
1604 }
1605
1606 static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1607                             snd_pcm_state_t state)
1608 {
1609         if (substream->runtime->trigger_master != substream)
1610                 return 0;
1611         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1612          * a delta between the current jiffies, this gives a large enough
1613          * delta, effectively to skip the check once.
1614          */
1615         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1616         return substream->ops->trigger(substream,
1617                                        pause_pushed(state) ?
1618                                        SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1619                                        SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1620 }
1621
1622 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1623                                snd_pcm_state_t state)
1624 {
1625         if (substream->runtime->trigger_master == substream)
1626                 substream->ops->trigger(substream,
1627                                         pause_pushed(state) ?
1628                                         SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1629                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1630 }
1631
1632 static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1633                                snd_pcm_state_t state)
1634 {
1635         struct snd_pcm_runtime *runtime = substream->runtime;
1636         snd_pcm_trigger_tstamp(substream);
1637         if (pause_pushed(state)) {
1638                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1639                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1640                 wake_up(&runtime->sleep);
1641                 wake_up(&runtime->tsleep);
1642         } else {
1643                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1644                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1645         }
1646 }
1647
1648 static const struct action_ops snd_pcm_action_pause = {
1649         .pre_action = snd_pcm_pre_pause,
1650         .do_action = snd_pcm_do_pause,
1651         .undo_action = snd_pcm_undo_pause,
1652         .post_action = snd_pcm_post_pause
1653 };
1654
1655 /*
1656  * Push/release the pause for all linked streams.
1657  */
1658 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1659 {
1660         return snd_pcm_action(&snd_pcm_action_pause, substream,
1661                               (__force snd_pcm_state_t)push);
1662 }
1663
1664 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1665                                   bool push)
1666 {
1667         return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1668                                        (__force snd_pcm_state_t)push);
1669 }
1670
1671 #ifdef CONFIG_PM
1672 /* suspend callback: state argument ignored */
1673
1674 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1675                                snd_pcm_state_t state)
1676 {
1677         struct snd_pcm_runtime *runtime = substream->runtime;
1678         switch (runtime->state) {
1679         case SNDRV_PCM_STATE_SUSPENDED:
1680                 return -EBUSY;
1681         /* unresumable PCM state; return -EBUSY for skipping suspend */
1682         case SNDRV_PCM_STATE_OPEN:
1683         case SNDRV_PCM_STATE_SETUP:
1684         case SNDRV_PCM_STATE_DISCONNECTED:
1685                 return -EBUSY;
1686         }
1687         runtime->trigger_master = substream;
1688         return 0;
1689 }
1690
1691 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1692                               snd_pcm_state_t state)
1693 {
1694         struct snd_pcm_runtime *runtime = substream->runtime;
1695         if (runtime->trigger_master != substream)
1696                 return 0;
1697         if (! snd_pcm_running(substream))
1698                 return 0;
1699         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1700         runtime->stop_operating = true;
1701         return 0; /* suspend unconditionally */
1702 }
1703
1704 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1705                                  snd_pcm_state_t state)
1706 {
1707         struct snd_pcm_runtime *runtime = substream->runtime;
1708         snd_pcm_trigger_tstamp(substream);
1709         runtime->suspended_state = runtime->state;
1710         runtime->status->suspended_state = runtime->suspended_state;
1711         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1712         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1713         wake_up(&runtime->sleep);
1714         wake_up(&runtime->tsleep);
1715 }
1716
1717 static const struct action_ops snd_pcm_action_suspend = {
1718         .pre_action = snd_pcm_pre_suspend,
1719         .do_action = snd_pcm_do_suspend,
1720         .post_action = snd_pcm_post_suspend
1721 };
1722
1723 /*
1724  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1725  * @substream: the PCM substream
1726  *
1727  * After this call, all streams are changed to SUSPENDED state.
1728  *
1729  * Return: Zero if successful, or a negative error code.
1730  */
1731 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1732 {
1733         guard(pcm_stream_lock_irqsave)(substream);
1734         return snd_pcm_action(&snd_pcm_action_suspend, substream,
1735                               ACTION_ARG_IGNORE);
1736 }
1737
1738 /**
1739  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1740  * @pcm: the PCM instance
1741  *
1742  * After this call, all streams are changed to SUSPENDED state.
1743  *
1744  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1745  */
1746 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1747 {
1748         struct snd_pcm_substream *substream;
1749         int stream, err = 0;
1750
1751         if (! pcm)
1752                 return 0;
1753
1754         for_each_pcm_substream(pcm, stream, substream) {
1755                 /* FIXME: the open/close code should lock this as well */
1756                 if (!substream->runtime)
1757                         continue;
1758
1759                 /*
1760                  * Skip BE dai link PCM's that are internal and may
1761                  * not have their substream ops set.
1762                  */
1763                 if (!substream->ops)
1764                         continue;
1765
1766                 err = snd_pcm_suspend(substream);
1767                 if (err < 0 && err != -EBUSY)
1768                         return err;
1769         }
1770
1771         for_each_pcm_substream(pcm, stream, substream)
1772                 snd_pcm_sync_stop(substream, false);
1773
1774         return 0;
1775 }
1776 EXPORT_SYMBOL(snd_pcm_suspend_all);
1777
1778 /* resume callbacks: state argument ignored */
1779
1780 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1781                               snd_pcm_state_t state)
1782 {
1783         struct snd_pcm_runtime *runtime = substream->runtime;
1784         if (runtime->state != SNDRV_PCM_STATE_SUSPENDED)
1785                 return -EBADFD;
1786         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1787                 return -ENOSYS;
1788         runtime->trigger_master = substream;
1789         return 0;
1790 }
1791
1792 static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1793                              snd_pcm_state_t state)
1794 {
1795         struct snd_pcm_runtime *runtime = substream->runtime;
1796         if (runtime->trigger_master != substream)
1797                 return 0;
1798         /* DMA not running previously? */
1799         if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1800             (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1801              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1802                 return 0;
1803         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1804 }
1805
1806 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1807                                 snd_pcm_state_t state)
1808 {
1809         if (substream->runtime->trigger_master == substream &&
1810             snd_pcm_running(substream))
1811                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1812 }
1813
1814 static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1815                                 snd_pcm_state_t state)
1816 {
1817         struct snd_pcm_runtime *runtime = substream->runtime;
1818         snd_pcm_trigger_tstamp(substream);
1819         __snd_pcm_set_state(runtime, runtime->suspended_state);
1820         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1821 }
1822
1823 static const struct action_ops snd_pcm_action_resume = {
1824         .pre_action = snd_pcm_pre_resume,
1825         .do_action = snd_pcm_do_resume,
1826         .undo_action = snd_pcm_undo_resume,
1827         .post_action = snd_pcm_post_resume
1828 };
1829
1830 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1831 {
1832         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1833                                        ACTION_ARG_IGNORE);
1834 }
1835
1836 #else
1837
1838 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1839 {
1840         return -ENOSYS;
1841 }
1842
1843 #endif /* CONFIG_PM */
1844
1845 /*
1846  * xrun ioctl
1847  *
1848  * Change the RUNNING stream(s) to XRUN state.
1849  */
1850 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1851 {
1852         struct snd_pcm_runtime *runtime = substream->runtime;
1853
1854         guard(pcm_stream_lock_irq)(substream);
1855         switch (runtime->state) {
1856         case SNDRV_PCM_STATE_XRUN:
1857                 return 0;       /* already there */
1858         case SNDRV_PCM_STATE_RUNNING:
1859                 __snd_pcm_xrun(substream);
1860                 return 0;
1861         default:
1862                 return -EBADFD;
1863         }
1864 }
1865
1866 /*
1867  * reset ioctl
1868  */
1869 /* reset callbacks:  state argument ignored */
1870 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1871                              snd_pcm_state_t state)
1872 {
1873         struct snd_pcm_runtime *runtime = substream->runtime;
1874         switch (runtime->state) {
1875         case SNDRV_PCM_STATE_RUNNING:
1876         case SNDRV_PCM_STATE_PREPARED:
1877         case SNDRV_PCM_STATE_PAUSED:
1878         case SNDRV_PCM_STATE_SUSPENDED:
1879                 return 0;
1880         default:
1881                 return -EBADFD;
1882         }
1883 }
1884
1885 static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1886                             snd_pcm_state_t state)
1887 {
1888         struct snd_pcm_runtime *runtime = substream->runtime;
1889         int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1890         if (err < 0)
1891                 return err;
1892         guard(pcm_stream_lock_irq)(substream);
1893         runtime->hw_ptr_base = 0;
1894         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1895                 runtime->status->hw_ptr % runtime->period_size;
1896         runtime->silence_start = runtime->status->hw_ptr;
1897         runtime->silence_filled = 0;
1898         return 0;
1899 }
1900
1901 static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1902                                snd_pcm_state_t state)
1903 {
1904         struct snd_pcm_runtime *runtime = substream->runtime;
1905         guard(pcm_stream_lock_irq)(substream);
1906         runtime->control->appl_ptr = runtime->status->hw_ptr;
1907         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1908             runtime->silence_size > 0)
1909                 snd_pcm_playback_silence(substream, ULONG_MAX);
1910 }
1911
1912 static const struct action_ops snd_pcm_action_reset = {
1913         .pre_action = snd_pcm_pre_reset,
1914         .do_action = snd_pcm_do_reset,
1915         .post_action = snd_pcm_post_reset
1916 };
1917
1918 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1919 {
1920         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1921                                         ACTION_ARG_IGNORE);
1922 }
1923
1924 /*
1925  * prepare ioctl
1926  */
1927 /* pass f_flags as state argument */
1928 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1929                                snd_pcm_state_t state)
1930 {
1931         struct snd_pcm_runtime *runtime = substream->runtime;
1932         int f_flags = (__force int)state;
1933
1934         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1935             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1936                 return -EBADFD;
1937         if (snd_pcm_running(substream))
1938                 return -EBUSY;
1939         substream->f_flags = f_flags;
1940         return 0;
1941 }
1942
1943 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1944                               snd_pcm_state_t state)
1945 {
1946         int err;
1947         snd_pcm_sync_stop(substream, true);
1948         err = substream->ops->prepare(substream);
1949         if (err < 0)
1950                 return err;
1951         return snd_pcm_do_reset(substream, state);
1952 }
1953
1954 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1955                                  snd_pcm_state_t state)
1956 {
1957         struct snd_pcm_runtime *runtime = substream->runtime;
1958         runtime->control->appl_ptr = runtime->status->hw_ptr;
1959         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1960 }
1961
1962 static const struct action_ops snd_pcm_action_prepare = {
1963         .pre_action = snd_pcm_pre_prepare,
1964         .do_action = snd_pcm_do_prepare,
1965         .post_action = snd_pcm_post_prepare
1966 };
1967
1968 /**
1969  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1970  * @substream: the PCM substream instance
1971  * @file: file to refer f_flags
1972  *
1973  * Return: Zero if successful, or a negative error code.
1974  */
1975 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1976                            struct file *file)
1977 {
1978         int f_flags;
1979
1980         if (file)
1981                 f_flags = file->f_flags;
1982         else
1983                 f_flags = substream->f_flags;
1984
1985         scoped_guard(pcm_stream_lock_irq, substream) {
1986                 switch (substream->runtime->state) {
1987                 case SNDRV_PCM_STATE_PAUSED:
1988                         snd_pcm_pause(substream, false);
1989                         fallthrough;
1990                 case SNDRV_PCM_STATE_SUSPENDED:
1991                         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1992                         break;
1993                 }
1994         }
1995
1996         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1997                                         substream,
1998                                         (__force snd_pcm_state_t)f_flags);
1999 }
2000
2001 /*
2002  * drain ioctl
2003  */
2004
2005 /* drain init callbacks: state argument ignored */
2006 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2007                                   snd_pcm_state_t state)
2008 {
2009         struct snd_pcm_runtime *runtime = substream->runtime;
2010         switch (runtime->state) {
2011         case SNDRV_PCM_STATE_OPEN:
2012         case SNDRV_PCM_STATE_DISCONNECTED:
2013         case SNDRV_PCM_STATE_SUSPENDED:
2014                 return -EBADFD;
2015         }
2016         runtime->trigger_master = substream;
2017         return 0;
2018 }
2019
2020 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2021                                  snd_pcm_state_t state)
2022 {
2023         struct snd_pcm_runtime *runtime = substream->runtime;
2024         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2025                 switch (runtime->state) {
2026                 case SNDRV_PCM_STATE_PREPARED:
2027                         /* start playback stream if possible */
2028                         if (! snd_pcm_playback_empty(substream)) {
2029                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2030                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2031                         } else {
2032                                 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2033                         }
2034                         break;
2035                 case SNDRV_PCM_STATE_RUNNING:
2036                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2037                         break;
2038                 case SNDRV_PCM_STATE_XRUN:
2039                         __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2040                         break;
2041                 default:
2042                         break;
2043                 }
2044         } else {
2045                 /* stop running stream */
2046                 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2047                         snd_pcm_state_t new_state;
2048
2049                         new_state = snd_pcm_capture_avail(runtime) > 0 ?
2050                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2051                         snd_pcm_do_stop(substream, new_state);
2052                         snd_pcm_post_stop(substream, new_state);
2053                 }
2054         }
2055
2056         if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2057             runtime->trigger_master == substream &&
2058             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2059                 return substream->ops->trigger(substream,
2060                                                SNDRV_PCM_TRIGGER_DRAIN);
2061
2062         return 0;
2063 }
2064
2065 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2066                                     snd_pcm_state_t state)
2067 {
2068 }
2069
2070 static const struct action_ops snd_pcm_action_drain_init = {
2071         .pre_action = snd_pcm_pre_drain_init,
2072         .do_action = snd_pcm_do_drain_init,
2073         .post_action = snd_pcm_post_drain_init
2074 };
2075
2076 /*
2077  * Drain the stream(s).
2078  * When the substream is linked, sync until the draining of all playback streams
2079  * is finished.
2080  * After this call, all streams are supposed to be either SETUP or DRAINING
2081  * (capture only) state.
2082  */
2083 static int snd_pcm_drain(struct snd_pcm_substream *substream,
2084                          struct file *file)
2085 {
2086         struct snd_card *card;
2087         struct snd_pcm_runtime *runtime;
2088         struct snd_pcm_substream *s;
2089         struct snd_pcm_group *group;
2090         wait_queue_entry_t wait;
2091         int result = 0;
2092         int nonblock = 0;
2093
2094         card = substream->pcm->card;
2095         runtime = substream->runtime;
2096
2097         if (runtime->state == SNDRV_PCM_STATE_OPEN)
2098                 return -EBADFD;
2099
2100         if (file) {
2101                 if (file->f_flags & O_NONBLOCK)
2102                         nonblock = 1;
2103         } else if (substream->f_flags & O_NONBLOCK)
2104                 nonblock = 1;
2105
2106         snd_pcm_stream_lock_irq(substream);
2107         /* resume pause */
2108         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2109                 snd_pcm_pause(substream, false);
2110
2111         /* pre-start/stop - all running streams are changed to DRAINING state */
2112         result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2113                                 ACTION_ARG_IGNORE);
2114         if (result < 0)
2115                 goto unlock;
2116         /* in non-blocking, we don't wait in ioctl but let caller poll */
2117         if (nonblock) {
2118                 result = -EAGAIN;
2119                 goto unlock;
2120         }
2121
2122         for (;;) {
2123                 long tout;
2124                 struct snd_pcm_runtime *to_check;
2125                 if (signal_pending(current)) {
2126                         result = -ERESTARTSYS;
2127                         break;
2128                 }
2129                 /* find a substream to drain */
2130                 to_check = NULL;
2131                 group = snd_pcm_stream_group_ref(substream);
2132                 snd_pcm_group_for_each_entry(s, substream) {
2133                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2134                                 continue;
2135                         runtime = s->runtime;
2136                         if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2137                                 to_check = runtime;
2138                                 break;
2139                         }
2140                 }
2141                 snd_pcm_group_unref(group, substream);
2142                 if (!to_check)
2143                         break; /* all drained */
2144                 init_waitqueue_entry(&wait, current);
2145                 set_current_state(TASK_INTERRUPTIBLE);
2146                 add_wait_queue(&to_check->sleep, &wait);
2147                 snd_pcm_stream_unlock_irq(substream);
2148                 if (runtime->no_period_wakeup)
2149                         tout = MAX_SCHEDULE_TIMEOUT;
2150                 else {
2151                         tout = 100;
2152                         if (runtime->rate) {
2153                                 long t = runtime->buffer_size * 1100 / runtime->rate;
2154                                 tout = max(t, tout);
2155                         }
2156                         tout = msecs_to_jiffies(tout);
2157                 }
2158                 tout = schedule_timeout(tout);
2159
2160                 snd_pcm_stream_lock_irq(substream);
2161                 group = snd_pcm_stream_group_ref(substream);
2162                 snd_pcm_group_for_each_entry(s, substream) {
2163                         if (s->runtime == to_check) {
2164                                 remove_wait_queue(&to_check->sleep, &wait);
2165                                 break;
2166                         }
2167                 }
2168                 snd_pcm_group_unref(group, substream);
2169
2170                 if (card->shutdown) {
2171                         result = -ENODEV;
2172                         break;
2173                 }
2174                 if (tout == 0) {
2175                         if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2176                                 result = -ESTRPIPE;
2177                         else {
2178                                 dev_dbg(substream->pcm->card->dev,
2179                                         "playback drain timeout (DMA or IRQ trouble?)\n");
2180                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2181                                 result = -EIO;
2182                         }
2183                         break;
2184                 }
2185         }
2186
2187  unlock:
2188         snd_pcm_stream_unlock_irq(substream);
2189
2190         return result;
2191 }
2192
2193 /*
2194  * drop ioctl
2195  *
2196  * Immediately put all linked substreams into SETUP state.
2197  */
2198 static int snd_pcm_drop(struct snd_pcm_substream *substream)
2199 {
2200         struct snd_pcm_runtime *runtime;
2201         int result = 0;
2202
2203         if (PCM_RUNTIME_CHECK(substream))
2204                 return -ENXIO;
2205         runtime = substream->runtime;
2206
2207         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2208             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2209                 return -EBADFD;
2210
2211         guard(pcm_stream_lock_irq)(substream);
2212         /* resume pause */
2213         if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2214                 snd_pcm_pause(substream, false);
2215
2216         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2217         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2218
2219         return result;
2220 }
2221
2222
2223 static bool is_pcm_file(struct file *file)
2224 {
2225         struct inode *inode = file_inode(file);
2226         struct snd_pcm *pcm;
2227         unsigned int minor;
2228
2229         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2230                 return false;
2231         minor = iminor(inode);
2232         pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2233         if (!pcm)
2234                 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2235         if (!pcm)
2236                 return false;
2237         snd_card_unref(pcm->card);
2238         return true;
2239 }
2240
2241 /*
2242  * PCM link handling
2243  */
2244 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2245 {
2246         struct snd_pcm_file *pcm_file;
2247         struct snd_pcm_substream *substream1;
2248         struct snd_pcm_group *group __free(kfree) = NULL;
2249         struct snd_pcm_group *target_group;
2250         bool nonatomic = substream->pcm->nonatomic;
2251         CLASS(fd, f)(fd);
2252
2253         if (fd_empty(f))
2254                 return -EBADFD;
2255         if (!is_pcm_file(fd_file(f)))
2256                 return -EBADFD;
2257
2258         pcm_file = fd_file(f)->private_data;
2259         substream1 = pcm_file->substream;
2260
2261         if (substream == substream1)
2262                 return -EINVAL;
2263
2264         group = kzalloc(sizeof(*group), GFP_KERNEL);
2265         if (!group)
2266                 return -ENOMEM;
2267         snd_pcm_group_init(group);
2268
2269         guard(rwsem_write)(&snd_pcm_link_rwsem);
2270         if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2271             substream->runtime->state != substream1->runtime->state ||
2272             substream->pcm->nonatomic != substream1->pcm->nonatomic)
2273                 return -EBADFD;
2274         if (snd_pcm_stream_linked(substream1))
2275                 return -EALREADY;
2276
2277         scoped_guard(pcm_stream_lock_irq, substream) {
2278                 if (!snd_pcm_stream_linked(substream)) {
2279                         snd_pcm_group_assign(substream, group);
2280                         group = NULL; /* assigned, don't free this one below */
2281                 }
2282                 target_group = substream->group;
2283         }
2284
2285         snd_pcm_group_lock_irq(target_group, nonatomic);
2286         snd_pcm_stream_lock_nested(substream1);
2287         snd_pcm_group_assign(substream1, target_group);
2288         refcount_inc(&target_group->refs);
2289         snd_pcm_stream_unlock(substream1);
2290         snd_pcm_group_unlock_irq(target_group, nonatomic);
2291         return 0;
2292 }
2293
2294 static void relink_to_local(struct snd_pcm_substream *substream)
2295 {
2296         snd_pcm_stream_lock_nested(substream);
2297         snd_pcm_group_assign(substream, &substream->self_group);
2298         snd_pcm_stream_unlock(substream);
2299 }
2300
2301 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2302 {
2303         struct snd_pcm_group *group;
2304         bool nonatomic = substream->pcm->nonatomic;
2305         bool do_free = false;
2306
2307         guard(rwsem_write)(&snd_pcm_link_rwsem);
2308
2309         if (!snd_pcm_stream_linked(substream))
2310                 return -EALREADY;
2311
2312         group = substream->group;
2313         snd_pcm_group_lock_irq(group, nonatomic);
2314
2315         relink_to_local(substream);
2316         refcount_dec(&group->refs);
2317
2318         /* detach the last stream, too */
2319         if (list_is_singular(&group->substreams)) {
2320                 relink_to_local(list_first_entry(&group->substreams,
2321                                                  struct snd_pcm_substream,
2322                                                  link_list));
2323                 do_free = refcount_dec_and_test(&group->refs);
2324         }
2325
2326         snd_pcm_group_unlock_irq(group, nonatomic);
2327         if (do_free)
2328                 kfree(group);
2329         return 0;
2330 }
2331
2332 /*
2333  * hw configurator
2334  */
2335 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2336                                struct snd_pcm_hw_rule *rule)
2337 {
2338         struct snd_interval t;
2339         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2340                      hw_param_interval_c(params, rule->deps[1]), &t);
2341         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2342 }
2343
2344 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2345                                struct snd_pcm_hw_rule *rule)
2346 {
2347         struct snd_interval t;
2348         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2349                      hw_param_interval_c(params, rule->deps[1]), &t);
2350         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2351 }
2352
2353 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2354                                    struct snd_pcm_hw_rule *rule)
2355 {
2356         struct snd_interval t;
2357         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2358                          hw_param_interval_c(params, rule->deps[1]),
2359                          (unsigned long) rule->private, &t);
2360         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2361 }
2362
2363 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2364                                    struct snd_pcm_hw_rule *rule)
2365 {
2366         struct snd_interval t;
2367         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2368                          (unsigned long) rule->private,
2369                          hw_param_interval_c(params, rule->deps[1]), &t);
2370         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2371 }
2372
2373 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2374                                   struct snd_pcm_hw_rule *rule)
2375 {
2376         snd_pcm_format_t k;
2377         const struct snd_interval *i =
2378                                 hw_param_interval_c(params, rule->deps[0]);
2379         struct snd_mask m;
2380         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2381         snd_mask_any(&m);
2382         pcm_for_each_format(k) {
2383                 int bits;
2384                 if (!snd_mask_test_format(mask, k))
2385                         continue;
2386                 bits = snd_pcm_format_physical_width(k);
2387                 if (bits <= 0)
2388                         continue; /* ignore invalid formats */
2389                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2390                         snd_mask_reset(&m, (__force unsigned)k);
2391         }
2392         return snd_mask_refine(mask, &m);
2393 }
2394
2395 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2396                                        struct snd_pcm_hw_rule *rule)
2397 {
2398         struct snd_interval t;
2399         snd_pcm_format_t k;
2400
2401         t.min = UINT_MAX;
2402         t.max = 0;
2403         t.openmin = 0;
2404         t.openmax = 0;
2405         pcm_for_each_format(k) {
2406                 int bits;
2407                 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2408                         continue;
2409                 bits = snd_pcm_format_physical_width(k);
2410                 if (bits <= 0)
2411                         continue; /* ignore invalid formats */
2412                 if (t.min > (unsigned)bits)
2413                         t.min = bits;
2414                 if (t.max < (unsigned)bits)
2415                         t.max = bits;
2416         }
2417         t.integer = 1;
2418         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2419 }
2420
2421 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 ||\
2422         SNDRV_PCM_RATE_128000 != 1 << 19
2423 #error "Change this table"
2424 #endif
2425
2426 /* NOTE: the list is unsorted! */
2427 static const unsigned int rates[] = {
2428         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2429         48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000,
2430         /* extended */
2431         12000, 24000, 128000
2432 };
2433
2434 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2435         .count = ARRAY_SIZE(rates),
2436         .list = rates,
2437 };
2438
2439 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2440                                 struct snd_pcm_hw_rule *rule)
2441 {
2442         struct snd_pcm_hardware *hw = rule->private;
2443         return snd_interval_list(hw_param_interval(params, rule->var),
2444                                  snd_pcm_known_rates.count,
2445                                  snd_pcm_known_rates.list, hw->rates);
2446 }
2447
2448 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2449                                             struct snd_pcm_hw_rule *rule)
2450 {
2451         struct snd_interval t;
2452         struct snd_pcm_substream *substream = rule->private;
2453         t.min = 0;
2454         t.max = substream->buffer_bytes_max;
2455         t.openmin = 0;
2456         t.openmax = 0;
2457         t.integer = 1;
2458         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2459 }
2460
2461 static int snd_pcm_hw_rule_subformats(struct snd_pcm_hw_params *params,
2462                                       struct snd_pcm_hw_rule *rule)
2463 {
2464         struct snd_mask *sfmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
2465         struct snd_mask *fmask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2466         u32 *subformats = rule->private;
2467         snd_pcm_format_t f;
2468         struct snd_mask m;
2469
2470         snd_mask_none(&m);
2471         /* All PCMs support at least the default STD subformat. */
2472         snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_STD);
2473
2474         pcm_for_each_format(f) {
2475                 if (!snd_mask_test(fmask, (__force unsigned)f))
2476                         continue;
2477
2478                 if (f == SNDRV_PCM_FORMAT_S32_LE && *subformats)
2479                         m.bits[0] |= *subformats;
2480                 else if (snd_pcm_format_linear(f))
2481                         snd_mask_set(&m, (__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
2482         }
2483
2484         return snd_mask_refine(sfmask, &m);
2485 }
2486
2487 static int snd_pcm_hw_constraint_subformats(struct snd_pcm_runtime *runtime,
2488                                            unsigned int cond, u32 *subformats)
2489 {
2490         return snd_pcm_hw_rule_add(runtime, cond, -1,
2491                                    snd_pcm_hw_rule_subformats, (void *)subformats,
2492                                    SNDRV_PCM_HW_PARAM_SUBFORMAT,
2493                                    SNDRV_PCM_HW_PARAM_FORMAT, -1);
2494 }
2495
2496 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2497 {
2498         struct snd_pcm_runtime *runtime = substream->runtime;
2499         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2500         int k, err;
2501
2502         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2503                 snd_mask_any(constrs_mask(constrs, k));
2504         }
2505
2506         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2507                 snd_interval_any(constrs_interval(constrs, k));
2508         }
2509
2510         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2511         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2512         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2513         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2514         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2515
2516         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2517                                    snd_pcm_hw_rule_format, NULL,
2518                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2519         if (err < 0)
2520                 return err;
2521         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2522                                   snd_pcm_hw_rule_sample_bits, NULL,
2523                                   SNDRV_PCM_HW_PARAM_FORMAT,
2524                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2525         if (err < 0)
2526                 return err;
2527         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2528                                   snd_pcm_hw_rule_div, NULL,
2529                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2530         if (err < 0)
2531                 return err;
2532         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2533                                   snd_pcm_hw_rule_mul, NULL,
2534                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2535         if (err < 0)
2536                 return err;
2537         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2538                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2539                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2540         if (err < 0)
2541                 return err;
2542         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2543                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2544                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2545         if (err < 0)
2546                 return err;
2547         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2548                                   snd_pcm_hw_rule_div, NULL,
2549                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2550         if (err < 0)
2551                 return err;
2552         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2553                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2554                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2555         if (err < 0)
2556                 return err;
2557         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2558                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2559                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2560         if (err < 0)
2561                 return err;
2562         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2563                                   snd_pcm_hw_rule_div, NULL,
2564                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2565         if (err < 0)
2566                 return err;
2567         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2568                                   snd_pcm_hw_rule_div, NULL,
2569                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2570         if (err < 0)
2571                 return err;
2572         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2573                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2574                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2575         if (err < 0)
2576                 return err;
2577         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2578                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2579                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2580         if (err < 0)
2581                 return err;
2582         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2583                                   snd_pcm_hw_rule_mul, NULL,
2584                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2585         if (err < 0)
2586                 return err;
2587         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2588                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2589                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2590         if (err < 0)
2591                 return err;
2592         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2593                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2594                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2595         if (err < 0)
2596                 return err;
2597         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2598                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2599                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2600         if (err < 0)
2601                 return err;
2602         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2603                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2604                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2605         if (err < 0)
2606                 return err;
2607         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2608                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2609                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2610         if (err < 0)
2611                 return err;
2612         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2613                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2614                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2615         if (err < 0)
2616                 return err;
2617         return 0;
2618 }
2619
2620 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2621 {
2622         struct snd_pcm_runtime *runtime = substream->runtime;
2623         struct snd_pcm_hardware *hw = &runtime->hw;
2624         int err;
2625         unsigned int mask = 0;
2626
2627         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2628                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2629         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2630                 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2631         if (hw_support_mmap(substream)) {
2632                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2633                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2634                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2635                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2636                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2637                         mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2638         }
2639         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2640         if (err < 0)
2641                 return err;
2642
2643         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2644         if (err < 0)
2645                 return err;
2646
2647         err = snd_pcm_hw_constraint_subformats(runtime, 0, &hw->subformats);
2648         if (err < 0)
2649                 return err;
2650
2651         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2652                                            hw->channels_min, hw->channels_max);
2653         if (err < 0)
2654                 return err;
2655
2656         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2657                                            hw->rate_min, hw->rate_max);
2658         if (err < 0)
2659                 return err;
2660
2661         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2662                                            hw->period_bytes_min, hw->period_bytes_max);
2663         if (err < 0)
2664                 return err;
2665
2666         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2667                                            hw->periods_min, hw->periods_max);
2668         if (err < 0)
2669                 return err;
2670
2671         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2672                                            hw->period_bytes_min, hw->buffer_bytes_max);
2673         if (err < 0)
2674                 return err;
2675
2676         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2677                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2678                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2679         if (err < 0)
2680                 return err;
2681
2682         /* FIXME: remove */
2683         if (runtime->dma_bytes) {
2684                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2685                 if (err < 0)
2686                         return err;
2687         }
2688
2689         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2690                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2691                                           snd_pcm_hw_rule_rate, hw,
2692                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2693                 if (err < 0)
2694                         return err;
2695         }
2696
2697         /* FIXME: this belong to lowlevel */
2698         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2699
2700         return 0;
2701 }
2702
2703 static void pcm_release_private(struct snd_pcm_substream *substream)
2704 {
2705         if (snd_pcm_stream_linked(substream))
2706                 snd_pcm_unlink(substream);
2707 }
2708
2709 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2710 {
2711         substream->ref_count--;
2712         if (substream->ref_count > 0)
2713                 return;
2714
2715         snd_pcm_drop(substream);
2716         if (substream->hw_opened) {
2717                 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2718                         do_hw_free(substream);
2719                 substream->ops->close(substream);
2720                 substream->hw_opened = 0;
2721         }
2722         if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2723                 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2724         if (substream->pcm_release) {
2725                 substream->pcm_release(substream);
2726                 substream->pcm_release = NULL;
2727         }
2728         snd_pcm_detach_substream(substream);
2729 }
2730 EXPORT_SYMBOL(snd_pcm_release_substream);
2731
2732 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2733                            struct file *file,
2734                            struct snd_pcm_substream **rsubstream)
2735 {
2736         struct snd_pcm_substream *substream;
2737         int err;
2738
2739         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2740         if (err < 0)
2741                 return err;
2742         if (substream->ref_count > 1) {
2743                 *rsubstream = substream;
2744                 return 0;
2745         }
2746
2747         err = snd_pcm_hw_constraints_init(substream);
2748         if (err < 0) {
2749                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2750                 goto error;
2751         }
2752
2753         err = substream->ops->open(substream);
2754         if (err < 0)
2755                 goto error;
2756
2757         substream->hw_opened = 1;
2758
2759         err = snd_pcm_hw_constraints_complete(substream);
2760         if (err < 0) {
2761                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2762                 goto error;
2763         }
2764
2765         /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2766          * the DMA buffer requires it
2767          */
2768         if (substream->managed_buffer_alloc &&
2769             substream->dma_buffer.dev.need_sync)
2770                 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2771
2772         *rsubstream = substream;
2773         return 0;
2774
2775  error:
2776         snd_pcm_release_substream(substream);
2777         return err;
2778 }
2779 EXPORT_SYMBOL(snd_pcm_open_substream);
2780
2781 static int snd_pcm_open_file(struct file *file,
2782                              struct snd_pcm *pcm,
2783                              int stream)
2784 {
2785         struct snd_pcm_file *pcm_file;
2786         struct snd_pcm_substream *substream;
2787         int err;
2788
2789         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2790         if (err < 0)
2791                 return err;
2792
2793         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2794         if (pcm_file == NULL) {
2795                 snd_pcm_release_substream(substream);
2796                 return -ENOMEM;
2797         }
2798         pcm_file->substream = substream;
2799         if (substream->ref_count == 1)
2800                 substream->pcm_release = pcm_release_private;
2801         file->private_data = pcm_file;
2802
2803         return 0;
2804 }
2805
2806 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2807 {
2808         struct snd_pcm *pcm;
2809         int err = nonseekable_open(inode, file);
2810         if (err < 0)
2811                 return err;
2812         pcm = snd_lookup_minor_data(iminor(inode),
2813                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2814         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2815         if (pcm)
2816                 snd_card_unref(pcm->card);
2817         return err;
2818 }
2819
2820 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2821 {
2822         struct snd_pcm *pcm;
2823         int err = nonseekable_open(inode, file);
2824         if (err < 0)
2825                 return err;
2826         pcm = snd_lookup_minor_data(iminor(inode),
2827                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2828         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2829         if (pcm)
2830                 snd_card_unref(pcm->card);
2831         return err;
2832 }
2833
2834 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2835 {
2836         int err;
2837         wait_queue_entry_t wait;
2838
2839         if (pcm == NULL) {
2840                 err = -ENODEV;
2841                 goto __error1;
2842         }
2843         err = snd_card_file_add(pcm->card, file);
2844         if (err < 0)
2845                 goto __error1;
2846         if (!try_module_get(pcm->card->module)) {
2847                 err = -EFAULT;
2848                 goto __error2;
2849         }
2850         init_waitqueue_entry(&wait, current);
2851         add_wait_queue(&pcm->open_wait, &wait);
2852         mutex_lock(&pcm->open_mutex);
2853         while (1) {
2854                 err = snd_pcm_open_file(file, pcm, stream);
2855                 if (err >= 0)
2856                         break;
2857                 if (err == -EAGAIN) {
2858                         if (file->f_flags & O_NONBLOCK) {
2859                                 err = -EBUSY;
2860                                 break;
2861                         }
2862                 } else
2863                         break;
2864                 set_current_state(TASK_INTERRUPTIBLE);
2865                 mutex_unlock(&pcm->open_mutex);
2866                 schedule();
2867                 mutex_lock(&pcm->open_mutex);
2868                 if (pcm->card->shutdown) {
2869                         err = -ENODEV;
2870                         break;
2871                 }
2872                 if (signal_pending(current)) {
2873                         err = -ERESTARTSYS;
2874                         break;
2875                 }
2876         }
2877         remove_wait_queue(&pcm->open_wait, &wait);
2878         mutex_unlock(&pcm->open_mutex);
2879         if (err < 0)
2880                 goto __error;
2881         return err;
2882
2883       __error:
2884         module_put(pcm->card->module);
2885       __error2:
2886         snd_card_file_remove(pcm->card, file);
2887       __error1:
2888         return err;
2889 }
2890
2891 static int snd_pcm_release(struct inode *inode, struct file *file)
2892 {
2893         struct snd_pcm *pcm;
2894         struct snd_pcm_substream *substream;
2895         struct snd_pcm_file *pcm_file;
2896
2897         pcm_file = file->private_data;
2898         substream = pcm_file->substream;
2899         if (snd_BUG_ON(!substream))
2900                 return -ENXIO;
2901         pcm = substream->pcm;
2902
2903         /* block until the device gets woken up as it may touch the hardware */
2904         snd_power_wait(pcm->card);
2905
2906         scoped_guard(mutex, &pcm->open_mutex) {
2907                 snd_pcm_release_substream(substream);
2908                 kfree(pcm_file);
2909         }
2910         wake_up(&pcm->open_wait);
2911         module_put(pcm->card->module);
2912         snd_card_file_remove(pcm->card, file);
2913         return 0;
2914 }
2915
2916 /* check and update PCM state; return 0 or a negative error
2917  * call this inside PCM lock
2918  */
2919 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2920 {
2921         switch (substream->runtime->state) {
2922         case SNDRV_PCM_STATE_DRAINING:
2923                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2924                         return -EBADFD;
2925                 fallthrough;
2926         case SNDRV_PCM_STATE_RUNNING:
2927                 return snd_pcm_update_hw_ptr(substream);
2928         case SNDRV_PCM_STATE_PREPARED:
2929         case SNDRV_PCM_STATE_PAUSED:
2930                 return 0;
2931         case SNDRV_PCM_STATE_SUSPENDED:
2932                 return -ESTRPIPE;
2933         case SNDRV_PCM_STATE_XRUN:
2934                 return -EPIPE;
2935         default:
2936                 return -EBADFD;
2937         }
2938 }
2939
2940 /* increase the appl_ptr; returns the processed frames or a negative error */
2941 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2942                                           snd_pcm_uframes_t frames,
2943                                            snd_pcm_sframes_t avail)
2944 {
2945         struct snd_pcm_runtime *runtime = substream->runtime;
2946         snd_pcm_sframes_t appl_ptr;
2947         int ret;
2948
2949         if (avail <= 0)
2950                 return 0;
2951         if (frames > (snd_pcm_uframes_t)avail)
2952                 frames = avail;
2953         appl_ptr = runtime->control->appl_ptr + frames;
2954         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2955                 appl_ptr -= runtime->boundary;
2956         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2957         return ret < 0 ? ret : frames;
2958 }
2959
2960 /* decrease the appl_ptr; returns the processed frames or zero for error */
2961 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2962                                          snd_pcm_uframes_t frames,
2963                                          snd_pcm_sframes_t avail)
2964 {
2965         struct snd_pcm_runtime *runtime = substream->runtime;
2966         snd_pcm_sframes_t appl_ptr;
2967         int ret;
2968
2969         if (avail <= 0)
2970                 return 0;
2971         if (frames > (snd_pcm_uframes_t)avail)
2972                 frames = avail;
2973         appl_ptr = runtime->control->appl_ptr - frames;
2974         if (appl_ptr < 0)
2975                 appl_ptr += runtime->boundary;
2976         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2977         /* NOTE: we return zero for errors because PulseAudio gets depressed
2978          * upon receiving an error from rewind ioctl and stops processing
2979          * any longer.  Returning zero means that no rewind is done, so
2980          * it's not absolutely wrong to answer like that.
2981          */
2982         return ret < 0 ? 0 : frames;
2983 }
2984
2985 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2986                                         snd_pcm_uframes_t frames)
2987 {
2988         snd_pcm_sframes_t ret;
2989
2990         if (frames == 0)
2991                 return 0;
2992
2993         scoped_guard(pcm_stream_lock_irq, substream) {
2994                 ret = do_pcm_hwsync(substream);
2995                 if (!ret)
2996                         ret = rewind_appl_ptr(substream, frames,
2997                                               snd_pcm_hw_avail(substream));
2998         }
2999         if (ret >= 0)
3000                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3001         return ret;
3002 }
3003
3004 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
3005                                          snd_pcm_uframes_t frames)
3006 {
3007         snd_pcm_sframes_t ret;
3008
3009         if (frames == 0)
3010                 return 0;
3011
3012         scoped_guard(pcm_stream_lock_irq, substream) {
3013                 ret = do_pcm_hwsync(substream);
3014                 if (!ret)
3015                         ret = forward_appl_ptr(substream, frames,
3016                                                snd_pcm_avail(substream));
3017         }
3018         if (ret >= 0)
3019                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3020         return ret;
3021 }
3022
3023 static int snd_pcm_delay(struct snd_pcm_substream *substream,
3024                          snd_pcm_sframes_t *delay)
3025 {
3026         int err;
3027
3028         scoped_guard(pcm_stream_lock_irq, substream) {
3029                 err = do_pcm_hwsync(substream);
3030                 if (delay && !err)
3031                         *delay = snd_pcm_calc_delay(substream);
3032         }
3033         snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3034
3035         return err;
3036 }
3037
3038 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3039 {
3040         return snd_pcm_delay(substream, NULL);
3041 }
3042
3043 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3044                             struct snd_pcm_sync_ptr __user *_sync_ptr)
3045 {
3046         struct snd_pcm_runtime *runtime = substream->runtime;
3047         struct snd_pcm_sync_ptr sync_ptr;
3048         volatile struct snd_pcm_mmap_status *status;
3049         volatile struct snd_pcm_mmap_control *control;
3050         int err;
3051
3052         memset(&sync_ptr, 0, sizeof(sync_ptr));
3053         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3054                 return -EFAULT;
3055         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3056                 return -EFAULT;
3057         status = runtime->status;
3058         control = runtime->control;
3059         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3060                 err = snd_pcm_hwsync(substream);
3061                 if (err < 0)
3062                         return err;
3063         }
3064         scoped_guard(pcm_stream_lock_irq, substream) {
3065                 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3066                         err = pcm_lib_apply_appl_ptr(substream,
3067                                                      sync_ptr.c.control.appl_ptr);
3068                         if (err < 0)
3069                                 return err;
3070                 } else {
3071                         sync_ptr.c.control.appl_ptr = control->appl_ptr;
3072                 }
3073                 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3074                         control->avail_min = sync_ptr.c.control.avail_min;
3075                 else
3076                         sync_ptr.c.control.avail_min = control->avail_min;
3077                 sync_ptr.s.status.state = status->state;
3078                 sync_ptr.s.status.hw_ptr = status->hw_ptr;
3079                 sync_ptr.s.status.tstamp = status->tstamp;
3080                 sync_ptr.s.status.suspended_state = status->suspended_state;
3081                 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3082         }
3083         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3084                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3085         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3086                 return -EFAULT;
3087         return 0;
3088 }
3089
3090 struct snd_pcm_mmap_status32 {
3091         snd_pcm_state_t state;
3092         s32 pad1;
3093         u32 hw_ptr;
3094         s32 tstamp_sec;
3095         s32 tstamp_nsec;
3096         snd_pcm_state_t suspended_state;
3097         s32 audio_tstamp_sec;
3098         s32 audio_tstamp_nsec;
3099 } __packed;
3100
3101 struct snd_pcm_mmap_control32 {
3102         u32 appl_ptr;
3103         u32 avail_min;
3104 };
3105
3106 struct snd_pcm_sync_ptr32 {
3107         u32 flags;
3108         union {
3109                 struct snd_pcm_mmap_status32 status;
3110                 unsigned char reserved[64];
3111         } s;
3112         union {
3113                 struct snd_pcm_mmap_control32 control;
3114                 unsigned char reserved[64];
3115         } c;
3116 } __packed;
3117
3118 /* recalculate the boundary within 32bit */
3119 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3120 {
3121         snd_pcm_uframes_t boundary;
3122
3123         if (! runtime->buffer_size)
3124                 return 0;
3125         boundary = runtime->buffer_size;
3126         while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3127                 boundary *= 2;
3128         return boundary;
3129 }
3130
3131 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3132                                          struct snd_pcm_sync_ptr32 __user *src)
3133 {
3134         struct snd_pcm_runtime *runtime = substream->runtime;
3135         volatile struct snd_pcm_mmap_status *status;
3136         volatile struct snd_pcm_mmap_control *control;
3137         u32 sflags;
3138         struct snd_pcm_mmap_control scontrol;
3139         struct snd_pcm_mmap_status sstatus;
3140         snd_pcm_uframes_t boundary;
3141         int err;
3142
3143         if (snd_BUG_ON(!runtime))
3144                 return -EINVAL;
3145
3146         if (get_user(sflags, &src->flags) ||
3147             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3148             get_user(scontrol.avail_min, &src->c.control.avail_min))
3149                 return -EFAULT;
3150         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3151                 err = snd_pcm_hwsync(substream);
3152                 if (err < 0)
3153                         return err;
3154         }
3155         status = runtime->status;
3156         control = runtime->control;
3157         boundary = recalculate_boundary(runtime);
3158         if (! boundary)
3159                 boundary = 0x7fffffff;
3160         scoped_guard(pcm_stream_lock_irq, substream) {
3161                 /* FIXME: we should consider the boundary for the sync from app */
3162                 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3163                         err = pcm_lib_apply_appl_ptr(substream,
3164                                                      scontrol.appl_ptr);
3165                         if (err < 0)
3166                                 return err;
3167                 } else
3168                         scontrol.appl_ptr = control->appl_ptr % boundary;
3169                 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3170                         control->avail_min = scontrol.avail_min;
3171                 else
3172                         scontrol.avail_min = control->avail_min;
3173                 sstatus.state = status->state;
3174                 sstatus.hw_ptr = status->hw_ptr % boundary;
3175                 sstatus.tstamp = status->tstamp;
3176                 sstatus.suspended_state = status->suspended_state;
3177                 sstatus.audio_tstamp = status->audio_tstamp;
3178         }
3179         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3180                 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3181         if (put_user(sstatus.state, &src->s.status.state) ||
3182             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3183             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3184             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3185             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3186             put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3187             put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3188             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3189             put_user(scontrol.avail_min, &src->c.control.avail_min))
3190                 return -EFAULT;
3191
3192         return 0;
3193 }
3194 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3195
3196 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3197 {
3198         struct snd_pcm_runtime *runtime = substream->runtime;
3199         int arg;
3200
3201         if (get_user(arg, _arg))
3202                 return -EFAULT;
3203         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3204                 return -EINVAL;
3205         runtime->tstamp_type = arg;
3206         return 0;
3207 }
3208
3209 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3210                                       struct snd_xferi __user *_xferi)
3211 {
3212         struct snd_xferi xferi;
3213         struct snd_pcm_runtime *runtime = substream->runtime;
3214         snd_pcm_sframes_t result;
3215
3216         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3217                 return -EBADFD;
3218         if (put_user(0, &_xferi->result))
3219                 return -EFAULT;
3220         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3221                 return -EFAULT;
3222         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3223                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3224         else
3225                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3226         if (put_user(result, &_xferi->result))
3227                 return -EFAULT;
3228         return result < 0 ? result : 0;
3229 }
3230
3231 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3232                                       struct snd_xfern __user *_xfern)
3233 {
3234         struct snd_xfern xfern;
3235         struct snd_pcm_runtime *runtime = substream->runtime;
3236         void *bufs __free(kfree) = NULL;
3237         snd_pcm_sframes_t result;
3238
3239         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3240                 return -EBADFD;
3241         if (runtime->channels > 128)
3242                 return -EINVAL;
3243         if (put_user(0, &_xfern->result))
3244                 return -EFAULT;
3245         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3246                 return -EFAULT;
3247
3248         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3249         if (IS_ERR(bufs))
3250                 return PTR_ERR(bufs);
3251         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3252                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3253         else
3254                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3255         if (put_user(result, &_xfern->result))
3256                 return -EFAULT;
3257         return result < 0 ? result : 0;
3258 }
3259
3260 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3261                                 snd_pcm_uframes_t __user *_frames)
3262 {
3263         snd_pcm_uframes_t frames;
3264         snd_pcm_sframes_t result;
3265
3266         if (get_user(frames, _frames))
3267                 return -EFAULT;
3268         if (put_user(0, _frames))
3269                 return -EFAULT;
3270         result = snd_pcm_rewind(substream, frames);
3271         if (put_user(result, _frames))
3272                 return -EFAULT;
3273         return result < 0 ? result : 0;
3274 }
3275
3276 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3277                                  snd_pcm_uframes_t __user *_frames)
3278 {
3279         snd_pcm_uframes_t frames;
3280         snd_pcm_sframes_t result;
3281
3282         if (get_user(frames, _frames))
3283                 return -EFAULT;
3284         if (put_user(0, _frames))
3285                 return -EFAULT;
3286         result = snd_pcm_forward(substream, frames);
3287         if (put_user(result, _frames))
3288                 return -EFAULT;
3289         return result < 0 ? result : 0;
3290 }
3291
3292 static int snd_pcm_common_ioctl(struct file *file,
3293                                  struct snd_pcm_substream *substream,
3294                                  unsigned int cmd, void __user *arg)
3295 {
3296         struct snd_pcm_file *pcm_file = file->private_data;
3297         int res;
3298
3299         if (PCM_RUNTIME_CHECK(substream))
3300                 return -ENXIO;
3301
3302         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3303                 return -EBADFD;
3304
3305         res = snd_power_wait(substream->pcm->card);
3306         if (res < 0)
3307                 return res;
3308
3309         switch (cmd) {
3310         case SNDRV_PCM_IOCTL_PVERSION:
3311                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3312         case SNDRV_PCM_IOCTL_INFO:
3313                 return snd_pcm_info_user(substream, arg);
3314         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
3315                 return 0;
3316         case SNDRV_PCM_IOCTL_TTSTAMP:
3317                 return snd_pcm_tstamp(substream, arg);
3318         case SNDRV_PCM_IOCTL_USER_PVERSION:
3319                 if (get_user(pcm_file->user_pversion,
3320                              (unsigned int __user *)arg))
3321                         return -EFAULT;
3322                 return 0;
3323         case SNDRV_PCM_IOCTL_HW_REFINE:
3324                 return snd_pcm_hw_refine_user(substream, arg);
3325         case SNDRV_PCM_IOCTL_HW_PARAMS:
3326                 return snd_pcm_hw_params_user(substream, arg);
3327         case SNDRV_PCM_IOCTL_HW_FREE:
3328                 return snd_pcm_hw_free(substream);
3329         case SNDRV_PCM_IOCTL_SW_PARAMS:
3330                 return snd_pcm_sw_params_user(substream, arg);
3331         case SNDRV_PCM_IOCTL_STATUS32:
3332                 return snd_pcm_status_user32(substream, arg, false);
3333         case SNDRV_PCM_IOCTL_STATUS_EXT32:
3334                 return snd_pcm_status_user32(substream, arg, true);
3335         case SNDRV_PCM_IOCTL_STATUS64:
3336                 return snd_pcm_status_user64(substream, arg, false);
3337         case SNDRV_PCM_IOCTL_STATUS_EXT64:
3338                 return snd_pcm_status_user64(substream, arg, true);
3339         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3340                 return snd_pcm_channel_info_user(substream, arg);
3341         case SNDRV_PCM_IOCTL_PREPARE:
3342                 return snd_pcm_prepare(substream, file);
3343         case SNDRV_PCM_IOCTL_RESET:
3344                 return snd_pcm_reset(substream);
3345         case SNDRV_PCM_IOCTL_START:
3346                 return snd_pcm_start_lock_irq(substream);
3347         case SNDRV_PCM_IOCTL_LINK:
3348                 return snd_pcm_link(substream, (int)(unsigned long) arg);
3349         case SNDRV_PCM_IOCTL_UNLINK:
3350                 return snd_pcm_unlink(substream);
3351         case SNDRV_PCM_IOCTL_RESUME:
3352                 return snd_pcm_resume(substream);
3353         case SNDRV_PCM_IOCTL_XRUN:
3354                 return snd_pcm_xrun(substream);
3355         case SNDRV_PCM_IOCTL_HWSYNC:
3356                 return snd_pcm_hwsync(substream);
3357         case SNDRV_PCM_IOCTL_DELAY:
3358         {
3359                 snd_pcm_sframes_t delay = 0;
3360                 snd_pcm_sframes_t __user *res = arg;
3361                 int err;
3362
3363                 err = snd_pcm_delay(substream, &delay);
3364                 if (err)
3365                         return err;
3366                 if (put_user(delay, res))
3367                         return -EFAULT;
3368                 return 0;
3369         }
3370         case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3371                 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3372         case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3373                 return snd_pcm_sync_ptr(substream, arg);
3374 #ifdef CONFIG_SND_SUPPORT_OLD_API
3375         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3376                 return snd_pcm_hw_refine_old_user(substream, arg);
3377         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3378                 return snd_pcm_hw_params_old_user(substream, arg);
3379 #endif
3380         case SNDRV_PCM_IOCTL_DRAIN:
3381                 return snd_pcm_drain(substream, file);
3382         case SNDRV_PCM_IOCTL_DROP:
3383                 return snd_pcm_drop(substream);
3384         case SNDRV_PCM_IOCTL_PAUSE:
3385                 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3386         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3387         case SNDRV_PCM_IOCTL_READI_FRAMES:
3388                 return snd_pcm_xferi_frames_ioctl(substream, arg);
3389         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3390         case SNDRV_PCM_IOCTL_READN_FRAMES:
3391                 return snd_pcm_xfern_frames_ioctl(substream, arg);
3392         case SNDRV_PCM_IOCTL_REWIND:
3393                 return snd_pcm_rewind_ioctl(substream, arg);
3394         case SNDRV_PCM_IOCTL_FORWARD:
3395                 return snd_pcm_forward_ioctl(substream, arg);
3396         }
3397         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3398         return -ENOTTY;
3399 }
3400
3401 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3402                           unsigned long arg)
3403 {
3404         struct snd_pcm_file *pcm_file;
3405
3406         pcm_file = file->private_data;
3407
3408         if (((cmd >> 8) & 0xff) != 'A')
3409                 return -ENOTTY;
3410
3411         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3412                                      (void __user *)arg);
3413 }
3414
3415 /**
3416  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3417  * @substream: PCM substream
3418  * @cmd: IOCTL cmd
3419  * @arg: IOCTL argument
3420  *
3421  * The function is provided primarily for OSS layer and USB gadget drivers,
3422  * and it allows only the limited set of ioctls (hw_params, sw_params,
3423  * prepare, start, drain, drop, forward).
3424  *
3425  * Return: zero if successful, or a negative error code
3426  */
3427 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3428                          unsigned int cmd, void *arg)
3429 {
3430         snd_pcm_uframes_t *frames = arg;
3431         snd_pcm_sframes_t result;
3432
3433         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3434                 return -EBADFD;
3435
3436         switch (cmd) {
3437         case SNDRV_PCM_IOCTL_FORWARD:
3438         {
3439                 /* provided only for OSS; capture-only and no value returned */
3440                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3441                         return -EINVAL;
3442                 result = snd_pcm_forward(substream, *frames);
3443                 return result < 0 ? result : 0;
3444         }
3445         case SNDRV_PCM_IOCTL_HW_PARAMS:
3446                 return snd_pcm_hw_params(substream, arg);
3447         case SNDRV_PCM_IOCTL_SW_PARAMS:
3448                 return snd_pcm_sw_params(substream, arg);
3449         case SNDRV_PCM_IOCTL_PREPARE:
3450                 return snd_pcm_prepare(substream, NULL);
3451         case SNDRV_PCM_IOCTL_START:
3452                 return snd_pcm_start_lock_irq(substream);
3453         case SNDRV_PCM_IOCTL_DRAIN:
3454                 return snd_pcm_drain(substream, NULL);
3455         case SNDRV_PCM_IOCTL_DROP:
3456                 return snd_pcm_drop(substream);
3457         case SNDRV_PCM_IOCTL_DELAY:
3458                 return snd_pcm_delay(substream, frames);
3459         default:
3460                 return -EINVAL;
3461         }
3462 }
3463 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3464
3465 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3466                             loff_t * offset)
3467 {
3468         struct snd_pcm_file *pcm_file;
3469         struct snd_pcm_substream *substream;
3470         struct snd_pcm_runtime *runtime;
3471         snd_pcm_sframes_t result;
3472
3473         pcm_file = file->private_data;
3474         substream = pcm_file->substream;
3475         if (PCM_RUNTIME_CHECK(substream))
3476                 return -ENXIO;
3477         runtime = substream->runtime;
3478         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3479             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3480                 return -EBADFD;
3481         if (!frame_aligned(runtime, count))
3482                 return -EINVAL;
3483         count = bytes_to_frames(runtime, count);
3484         result = snd_pcm_lib_read(substream, buf, count);
3485         if (result > 0)
3486                 result = frames_to_bytes(runtime, result);
3487         return result;
3488 }
3489
3490 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3491                              size_t count, loff_t * offset)
3492 {
3493         struct snd_pcm_file *pcm_file;
3494         struct snd_pcm_substream *substream;
3495         struct snd_pcm_runtime *runtime;
3496         snd_pcm_sframes_t result;
3497
3498         pcm_file = file->private_data;
3499         substream = pcm_file->substream;
3500         if (PCM_RUNTIME_CHECK(substream))
3501                 return -ENXIO;
3502         runtime = substream->runtime;
3503         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3504             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3505                 return -EBADFD;
3506         if (!frame_aligned(runtime, count))
3507                 return -EINVAL;
3508         count = bytes_to_frames(runtime, count);
3509         result = snd_pcm_lib_write(substream, buf, count);
3510         if (result > 0)
3511                 result = frames_to_bytes(runtime, result);
3512         return result;
3513 }
3514
3515 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3516 {
3517         struct snd_pcm_file *pcm_file;
3518         struct snd_pcm_substream *substream;
3519         struct snd_pcm_runtime *runtime;
3520         snd_pcm_sframes_t result;
3521         unsigned long i;
3522         void __user **bufs __free(kfree) = NULL;
3523         snd_pcm_uframes_t frames;
3524         const struct iovec *iov = iter_iov(to);
3525
3526         pcm_file = iocb->ki_filp->private_data;
3527         substream = pcm_file->substream;
3528         if (PCM_RUNTIME_CHECK(substream))
3529                 return -ENXIO;
3530         runtime = substream->runtime;
3531         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3532             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3533                 return -EBADFD;
3534         if (!user_backed_iter(to))
3535                 return -EINVAL;
3536         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3537                 return -EINVAL;
3538         if (!frame_aligned(runtime, iov->iov_len))
3539                 return -EINVAL;
3540         frames = bytes_to_samples(runtime, iov->iov_len);
3541         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3542         if (bufs == NULL)
3543                 return -ENOMEM;
3544         for (i = 0; i < to->nr_segs; ++i) {
3545                 bufs[i] = iov->iov_base;
3546                 iov++;
3547         }
3548         result = snd_pcm_lib_readv(substream, bufs, frames);
3549         if (result > 0)
3550                 result = frames_to_bytes(runtime, result);
3551         return result;
3552 }
3553
3554 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3555 {
3556         struct snd_pcm_file *pcm_file;
3557         struct snd_pcm_substream *substream;
3558         struct snd_pcm_runtime *runtime;
3559         snd_pcm_sframes_t result;
3560         unsigned long i;
3561         void __user **bufs __free(kfree) = NULL;
3562         snd_pcm_uframes_t frames;
3563         const struct iovec *iov = iter_iov(from);
3564
3565         pcm_file = iocb->ki_filp->private_data;
3566         substream = pcm_file->substream;
3567         if (PCM_RUNTIME_CHECK(substream))
3568                 return -ENXIO;
3569         runtime = substream->runtime;
3570         if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3571             runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3572                 return -EBADFD;
3573         if (!user_backed_iter(from))
3574                 return -EINVAL;
3575         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3576             !frame_aligned(runtime, iov->iov_len))
3577                 return -EINVAL;
3578         frames = bytes_to_samples(runtime, iov->iov_len);
3579         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3580         if (bufs == NULL)
3581                 return -ENOMEM;
3582         for (i = 0; i < from->nr_segs; ++i) {
3583                 bufs[i] = iov->iov_base;
3584                 iov++;
3585         }
3586         result = snd_pcm_lib_writev(substream, bufs, frames);
3587         if (result > 0)
3588                 result = frames_to_bytes(runtime, result);
3589         return result;
3590 }
3591
3592 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3593 {
3594         struct snd_pcm_file *pcm_file;
3595         struct snd_pcm_substream *substream;
3596         struct snd_pcm_runtime *runtime;
3597         __poll_t mask, ok;
3598         snd_pcm_uframes_t avail;
3599
3600         pcm_file = file->private_data;
3601
3602         substream = pcm_file->substream;
3603         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3604                 ok = EPOLLOUT | EPOLLWRNORM;
3605         else
3606                 ok = EPOLLIN | EPOLLRDNORM;
3607         if (PCM_RUNTIME_CHECK(substream))
3608                 return ok | EPOLLERR;
3609
3610         runtime = substream->runtime;
3611         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3612                 return ok | EPOLLERR;
3613
3614         poll_wait(file, &runtime->sleep, wait);
3615
3616         mask = 0;
3617         guard(pcm_stream_lock_irq)(substream);
3618         avail = snd_pcm_avail(substream);
3619         switch (runtime->state) {
3620         case SNDRV_PCM_STATE_RUNNING:
3621         case SNDRV_PCM_STATE_PREPARED:
3622         case SNDRV_PCM_STATE_PAUSED:
3623                 if (avail >= runtime->control->avail_min)
3624                         mask = ok;
3625                 break;
3626         case SNDRV_PCM_STATE_DRAINING:
3627                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3628                         mask = ok;
3629                         if (!avail)
3630                                 mask |= EPOLLERR;
3631                 }
3632                 break;
3633         default:
3634                 mask = ok | EPOLLERR;
3635                 break;
3636         }
3637         return mask;
3638 }
3639
3640 /*
3641  * mmap support
3642  */
3643
3644 /*
3645  * Only on coherent architectures, we can mmap the status and the control records
3646  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3647  */
3648 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3649 /*
3650  * mmap status record
3651  */
3652 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3653 {
3654         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3655         struct snd_pcm_runtime *runtime;
3656
3657         if (substream == NULL)
3658                 return VM_FAULT_SIGBUS;
3659         runtime = substream->runtime;
3660         vmf->page = virt_to_page(runtime->status);
3661         get_page(vmf->page);
3662         return 0;
3663 }
3664
3665 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3666 {
3667         .fault =        snd_pcm_mmap_status_fault,
3668 };
3669
3670 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3671                                struct vm_area_struct *area)
3672 {
3673         long size;
3674         if (!(area->vm_flags & VM_READ))
3675                 return -EINVAL;
3676         size = area->vm_end - area->vm_start;
3677         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3678                 return -EINVAL;
3679         area->vm_ops = &snd_pcm_vm_ops_status;
3680         area->vm_private_data = substream;
3681         vm_flags_mod(area, VM_DONTEXPAND | VM_DONTDUMP,
3682                      VM_WRITE | VM_MAYWRITE);
3683
3684         return 0;
3685 }
3686
3687 /*
3688  * mmap control record
3689  */
3690 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3691 {
3692         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3693         struct snd_pcm_runtime *runtime;
3694
3695         if (substream == NULL)
3696                 return VM_FAULT_SIGBUS;
3697         runtime = substream->runtime;
3698         vmf->page = virt_to_page(runtime->control);
3699         get_page(vmf->page);
3700         return 0;
3701 }
3702
3703 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3704 {
3705         .fault =        snd_pcm_mmap_control_fault,
3706 };
3707
3708 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3709                                 struct vm_area_struct *area)
3710 {
3711         long size;
3712         if (!(area->vm_flags & VM_READ))
3713                 return -EINVAL;
3714         size = area->vm_end - area->vm_start;
3715         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3716                 return -EINVAL;
3717         area->vm_ops = &snd_pcm_vm_ops_control;
3718         area->vm_private_data = substream;
3719         vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3720         return 0;
3721 }
3722
3723 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3724 {
3725         /* If drivers require the explicit sync (typically for non-coherent
3726          * pages), we have to disable the mmap of status and control data
3727          * to enforce the control via SYNC_PTR ioctl.
3728          */
3729         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3730                 return false;
3731         /* See pcm_control_mmap_allowed() below.
3732          * Since older alsa-lib requires both status and control mmaps to be
3733          * coupled, we have to disable the status mmap for old alsa-lib, too.
3734          */
3735         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3736             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3737                 return false;
3738         return true;
3739 }
3740
3741 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3742 {
3743         if (pcm_file->no_compat_mmap)
3744                 return false;
3745         /* see above */
3746         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3747                 return false;
3748         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3749          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3750          * thus it effectively assures the manual update of appl_ptr.
3751          */
3752         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3753                 return false;
3754         return true;
3755 }
3756
3757 #else /* ! coherent mmap */
3758 /*
3759  * don't support mmap for status and control records.
3760  */
3761 #define pcm_status_mmap_allowed(pcm_file)       false
3762 #define pcm_control_mmap_allowed(pcm_file)      false
3763
3764 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3765                                struct vm_area_struct *area)
3766 {
3767         return -ENXIO;
3768 }
3769 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3770                                 struct vm_area_struct *area)
3771 {
3772         return -ENXIO;
3773 }
3774 #endif /* coherent mmap */
3775
3776 /*
3777  * snd_pcm_mmap_data_open - increase the mmap counter
3778  */
3779 static void snd_pcm_mmap_data_open(struct vm_area_struct *area)
3780 {
3781         struct snd_pcm_substream *substream = area->vm_private_data;
3782
3783         atomic_inc(&substream->mmap_count);
3784 }
3785
3786 /*
3787  * snd_pcm_mmap_data_close - decrease the mmap counter
3788  */
3789 static void snd_pcm_mmap_data_close(struct vm_area_struct *area)
3790 {
3791         struct snd_pcm_substream *substream = area->vm_private_data;
3792
3793         atomic_dec(&substream->mmap_count);
3794 }
3795
3796 /*
3797  * fault callback for mmapping a RAM page
3798  */
3799 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3800 {
3801         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3802         struct snd_pcm_runtime *runtime;
3803         unsigned long offset;
3804         struct page * page;
3805         size_t dma_bytes;
3806
3807         if (substream == NULL)
3808                 return VM_FAULT_SIGBUS;
3809         runtime = substream->runtime;
3810         offset = vmf->pgoff << PAGE_SHIFT;
3811         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3812         if (offset > dma_bytes - PAGE_SIZE)
3813                 return VM_FAULT_SIGBUS;
3814         if (substream->ops->page)
3815                 page = substream->ops->page(substream, offset);
3816         else if (!snd_pcm_get_dma_buf(substream)) {
3817                 if (WARN_ON_ONCE(!runtime->dma_area))
3818                         return VM_FAULT_SIGBUS;
3819                 page = virt_to_page(runtime->dma_area + offset);
3820         } else
3821                 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3822         if (!page)
3823                 return VM_FAULT_SIGBUS;
3824         get_page(page);
3825         vmf->page = page;
3826         return 0;
3827 }
3828
3829 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3830         .open =         snd_pcm_mmap_data_open,
3831         .close =        snd_pcm_mmap_data_close,
3832 };
3833
3834 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3835         .open =         snd_pcm_mmap_data_open,
3836         .close =        snd_pcm_mmap_data_close,
3837         .fault =        snd_pcm_mmap_data_fault,
3838 };
3839
3840 /*
3841  * mmap the DMA buffer on RAM
3842  */
3843
3844 /**
3845  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3846  * @substream: PCM substream
3847  * @area: VMA
3848  *
3849  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3850  * this function is invoked implicitly.
3851  *
3852  * Return: zero if successful, or a negative error code
3853  */
3854 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3855                              struct vm_area_struct *area)
3856 {
3857         vm_flags_set(area, VM_DONTEXPAND | VM_DONTDUMP);
3858         if (!substream->ops->page &&
3859             !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3860                 return 0;
3861         /* mmap with fault handler */
3862         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3863         return 0;
3864 }
3865 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3866
3867 /*
3868  * mmap the DMA buffer on I/O memory area
3869  */
3870 #if SNDRV_PCM_INFO_MMAP_IOMEM
3871 /**
3872  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3873  * @substream: PCM substream
3874  * @area: VMA
3875  *
3876  * When your hardware uses the iomapped pages as the hardware buffer and
3877  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3878  * is supposed to work only on limited architectures.
3879  *
3880  * Return: zero if successful, or a negative error code
3881  */
3882 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3883                            struct vm_area_struct *area)
3884 {
3885         struct snd_pcm_runtime *runtime = substream->runtime;
3886
3887         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3888         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3889 }
3890 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3891 #endif /* SNDRV_PCM_INFO_MMAP */
3892
3893 /*
3894  * mmap DMA buffer
3895  */
3896 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3897                       struct vm_area_struct *area)
3898 {
3899         struct snd_pcm_runtime *runtime;
3900         long size;
3901         unsigned long offset;
3902         size_t dma_bytes;
3903         int err;
3904
3905         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3906                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3907                         return -EINVAL;
3908         } else {
3909                 if (!(area->vm_flags & VM_READ))
3910                         return -EINVAL;
3911         }
3912         runtime = substream->runtime;
3913         if (runtime->state == SNDRV_PCM_STATE_OPEN)
3914                 return -EBADFD;
3915         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3916                 return -ENXIO;
3917         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3918             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3919                 return -EINVAL;
3920         size = area->vm_end - area->vm_start;
3921         offset = area->vm_pgoff << PAGE_SHIFT;
3922         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3923         if ((size_t)size > dma_bytes)
3924                 return -EINVAL;
3925         if (offset > dma_bytes - size)
3926                 return -EINVAL;
3927
3928         area->vm_ops = &snd_pcm_vm_ops_data;
3929         area->vm_private_data = substream;
3930         if (substream->ops->mmap)
3931                 err = substream->ops->mmap(substream, area);
3932         else
3933                 err = snd_pcm_lib_default_mmap(substream, area);
3934         if (!err)
3935                 atomic_inc(&substream->mmap_count);
3936         return err;
3937 }
3938 EXPORT_SYMBOL(snd_pcm_mmap_data);
3939
3940 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3941 {
3942         struct snd_pcm_file * pcm_file;
3943         struct snd_pcm_substream *substream;
3944         unsigned long offset;
3945
3946         pcm_file = file->private_data;
3947         substream = pcm_file->substream;
3948         if (PCM_RUNTIME_CHECK(substream))
3949                 return -ENXIO;
3950         if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3951                 return -EBADFD;
3952
3953         offset = area->vm_pgoff << PAGE_SHIFT;
3954         switch (offset) {
3955         case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3956                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3957                         return -ENXIO;
3958                 fallthrough;
3959         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3960                 if (!pcm_status_mmap_allowed(pcm_file))
3961                         return -ENXIO;
3962                 return snd_pcm_mmap_status(substream, file, area);
3963         case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3964                 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3965                         return -ENXIO;
3966                 fallthrough;
3967         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3968                 if (!pcm_control_mmap_allowed(pcm_file))
3969                         return -ENXIO;
3970                 return snd_pcm_mmap_control(substream, file, area);
3971         default:
3972                 return snd_pcm_mmap_data(substream, file, area);
3973         }
3974         return 0;
3975 }
3976
3977 static int snd_pcm_fasync(int fd, struct file * file, int on)
3978 {
3979         struct snd_pcm_file * pcm_file;
3980         struct snd_pcm_substream *substream;
3981         struct snd_pcm_runtime *runtime;
3982
3983         pcm_file = file->private_data;
3984         substream = pcm_file->substream;
3985         if (PCM_RUNTIME_CHECK(substream))
3986                 return -ENXIO;
3987         runtime = substream->runtime;
3988         if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3989                 return -EBADFD;
3990         return snd_fasync_helper(fd, file, on, &runtime->fasync);
3991 }
3992
3993 /*
3994  * ioctl32 compat
3995  */
3996 #ifdef CONFIG_COMPAT
3997 #include "pcm_compat.c"
3998 #else
3999 #define snd_pcm_ioctl_compat    NULL
4000 #endif
4001
4002 /*
4003  *  To be removed helpers to keep binary compatibility
4004  */
4005
4006 #ifdef CONFIG_SND_SUPPORT_OLD_API
4007 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
4008 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
4009
4010 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
4011                                                struct snd_pcm_hw_params_old *oparams)
4012 {
4013         unsigned int i;
4014
4015         memset(params, 0, sizeof(*params));
4016         params->flags = oparams->flags;
4017         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4018                 params->masks[i].bits[0] = oparams->masks[i];
4019         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
4020         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
4021         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
4022         params->info = oparams->info;
4023         params->msbits = oparams->msbits;
4024         params->rate_num = oparams->rate_num;
4025         params->rate_den = oparams->rate_den;
4026         params->fifo_size = oparams->fifo_size;
4027 }
4028
4029 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
4030                                              struct snd_pcm_hw_params *params)
4031 {
4032         unsigned int i;
4033
4034         memset(oparams, 0, sizeof(*oparams));
4035         oparams->flags = params->flags;
4036         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4037                 oparams->masks[i] = params->masks[i].bits[0];
4038         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4039         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4040         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4041         oparams->info = params->info;
4042         oparams->msbits = params->msbits;
4043         oparams->rate_num = params->rate_num;
4044         oparams->rate_den = params->rate_den;
4045         oparams->fifo_size = params->fifo_size;
4046 }
4047
4048 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4049                                       struct snd_pcm_hw_params_old __user * _oparams)
4050 {
4051         struct snd_pcm_hw_params *params __free(kfree) = NULL;
4052         struct snd_pcm_hw_params_old *oparams __free(kfree) = NULL;
4053         int err;
4054
4055         params = kmalloc(sizeof(*params), GFP_KERNEL);
4056         if (!params)
4057                 return -ENOMEM;
4058
4059         oparams = memdup_user(_oparams, sizeof(*oparams));
4060         if (IS_ERR(oparams))
4061                 return PTR_ERR(oparams);
4062         snd_pcm_hw_convert_from_old_params(params, oparams);
4063         err = snd_pcm_hw_refine(substream, params);
4064         if (err < 0)
4065                 return err;
4066
4067         err = fixup_unreferenced_params(substream, params);
4068         if (err < 0)
4069                 return err;
4070
4071         snd_pcm_hw_convert_to_old_params(oparams, params);
4072         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4073                 return -EFAULT;
4074         return 0;
4075 }
4076
4077 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4078                                       struct snd_pcm_hw_params_old __user * _oparams)
4079 {
4080         struct snd_pcm_hw_params *params __free(kfree) = NULL;
4081         struct snd_pcm_hw_params_old *oparams __free(kfree) = NULL;
4082         int err;
4083
4084         params = kmalloc(sizeof(*params), GFP_KERNEL);
4085         if (!params)
4086                 return -ENOMEM;
4087
4088         oparams = memdup_user(_oparams, sizeof(*oparams));
4089         if (IS_ERR(oparams))
4090                 return PTR_ERR(oparams);
4091
4092         snd_pcm_hw_convert_from_old_params(params, oparams);
4093         err = snd_pcm_hw_params(substream, params);
4094         if (err < 0)
4095                 return err;
4096
4097         snd_pcm_hw_convert_to_old_params(oparams, params);
4098         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4099                 return -EFAULT;
4100         return 0;
4101 }
4102 #endif /* CONFIG_SND_SUPPORT_OLD_API */
4103
4104 #ifndef CONFIG_MMU
4105 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4106                                                unsigned long addr,
4107                                                unsigned long len,
4108                                                unsigned long pgoff,
4109                                                unsigned long flags)
4110 {
4111         struct snd_pcm_file *pcm_file = file->private_data;
4112         struct snd_pcm_substream *substream = pcm_file->substream;
4113         struct snd_pcm_runtime *runtime = substream->runtime;
4114         unsigned long offset = pgoff << PAGE_SHIFT;
4115
4116         switch (offset) {
4117         case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4118                 return (unsigned long)runtime->status;
4119         case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4120                 return (unsigned long)runtime->control;
4121         default:
4122                 return (unsigned long)runtime->dma_area + offset;
4123         }
4124 }
4125 #else
4126 # define snd_pcm_get_unmapped_area NULL
4127 #endif
4128
4129 /*
4130  *  Register section
4131  */
4132
4133 const struct file_operations snd_pcm_f_ops[2] = {
4134         {
4135                 .owner =                THIS_MODULE,
4136                 .write =                snd_pcm_write,
4137                 .write_iter =           snd_pcm_writev,
4138                 .open =                 snd_pcm_playback_open,
4139                 .release =              snd_pcm_release,
4140                 .poll =                 snd_pcm_poll,
4141                 .unlocked_ioctl =       snd_pcm_ioctl,
4142                 .compat_ioctl =         snd_pcm_ioctl_compat,
4143                 .mmap =                 snd_pcm_mmap,
4144                 .fasync =               snd_pcm_fasync,
4145                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4146         },
4147         {
4148                 .owner =                THIS_MODULE,
4149                 .read =                 snd_pcm_read,
4150                 .read_iter =            snd_pcm_readv,
4151                 .open =                 snd_pcm_capture_open,
4152                 .release =              snd_pcm_release,
4153                 .poll =                 snd_pcm_poll,
4154                 .unlocked_ioctl =       snd_pcm_ioctl,
4155                 .compat_ioctl =         snd_pcm_ioctl_compat,
4156                 .mmap =                 snd_pcm_mmap,
4157                 .fasync =               snd_pcm_fasync,
4158                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
4159         }
4160 };