pcm_compat.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   32bit -> 64bit ioctl wrapper for PCM API
   4  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5  */
   6
   7 /* This file included from pcm_native.c */
   8
   9 #include <linux/compat.h>
  10 #include <linux/slab.h>
  11
  12 static int snd_pcm_ioctl_delay_compat(struct snd_pcm_substream *substream,
  13                                       s32 __user *src)
  14 {
  15         snd_pcm_sframes_t delay;
  16         int err;
  17
  18         err = snd_pcm_delay(substream, &delay);
  19         if (err)
  20                 return err;
  21         if (put_user(delay, src))
  22                 return -EFAULT;
  23         return 0;
  24 }
  25
  26 static int snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream *substream,
  27                                        u32 __user *src)
  28 {
  29         snd_pcm_uframes_t frames;
  30         int err;
  31
  32         if (get_user(frames, src))
  33                 return -EFAULT;
  34         err = snd_pcm_rewind(substream, frames);
  35         if (put_user(err, src))
  36                 return -EFAULT;
  37         return err < 0 ? err : 0;
  38 }
  39
  40 static int snd_pcm_ioctl_forward_compat(struct snd_pcm_substream *substream,
  41                                        u32 __user *src)
  42 {
  43         snd_pcm_uframes_t frames;
  44         int err;
  45
  46         if (get_user(frames, src))
  47                 return -EFAULT;
  48         err = snd_pcm_forward(substream, frames);
  49         if (put_user(err, src))
  50                 return -EFAULT;
  51         return err < 0 ? err : 0;
  52 }
  53
  54 struct snd_pcm_hw_params32 {
  55         u32 flags;
  56         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
  57         struct snd_mask mres[5];        /* reserved masks */
  58         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
  59         struct snd_interval ires[9];    /* reserved intervals */
  60         u32 rmask;
  61         u32 cmask;
  62         u32 info;
  63         u32 msbits;
  64         u32 rate_num;
  65         u32 rate_den;
  66         u32 fifo_size;
  67         unsigned char reserved[64];
  68 };
  69
  70 struct snd_pcm_sw_params32 {
  71         s32 tstamp_mode;
  72         u32 period_step;
  73         u32 sleep_min;
  74         u32 avail_min;
  75         u32 xfer_align;
  76         u32 start_threshold;
  77         u32 stop_threshold;
  78         u32 silence_threshold;
  79         u32 silence_size;
  80         u32 boundary;
  81         u32 proto;
  82         u32 tstamp_type;
  83         unsigned char reserved[56];
  84 };
  85
  86 static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream,
  87                                           struct snd_pcm_sw_params32 __user *src)
  88 {
  89         struct snd_pcm_sw_params params;
  90         snd_pcm_uframes_t boundary;
  91         int err;
  92
  93         memset(&params, 0, sizeof(params));
  94         if (get_user(params.tstamp_mode, &src->tstamp_mode) ||
  95             get_user(params.period_step, &src->period_step) ||
  96             get_user(params.sleep_min, &src->sleep_min) ||
  97             get_user(params.avail_min, &src->avail_min) ||
  98             get_user(params.xfer_align, &src->xfer_align) ||
  99             get_user(params.start_threshold, &src->start_threshold) ||
 100             get_user(params.stop_threshold, &src->stop_threshold) ||
 101             get_user(params.silence_threshold, &src->silence_threshold) ||
 102             get_user(params.silence_size, &src->silence_size) ||
 103             get_user(params.tstamp_type, &src->tstamp_type) ||
 104             get_user(params.proto, &src->proto))
 105                 return -EFAULT;
 106         /*
 107          * Check silent_size parameter.  Since we have 64bit boundary,
 108          * silence_size must be compared with the 32bit boundary.
 109          */
 110         boundary = recalculate_boundary(substream->runtime);
 111         if (boundary && params.silence_size >= boundary)
 112                 params.silence_size = substream->runtime->boundary;
 113         err = snd_pcm_sw_params(substream, &params);
 114         if (err < 0)
 115                 return err;
 116         if (boundary && put_user(boundary, &src->boundary))
 117                 return -EFAULT;
 118         return err;
 119 }
 120
 121 struct snd_pcm_channel_info32 {
 122         u32 channel;
 123         u32 offset;
 124         u32 first;
 125         u32 step;
 126 };
 127
 128 static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream,
 129                                              struct snd_pcm_channel_info32 __user *src)
 130 {
 131         struct snd_pcm_channel_info info;
 132         int err;
 133
 134         if (get_user(info.channel, &src->channel) ||
 135             get_user(info.offset, &src->offset) ||
 136             get_user(info.first, &src->first) ||
 137             get_user(info.step, &src->step))
 138                 return -EFAULT;
 139         err = snd_pcm_channel_info(substream, &info);
 140         if (err < 0)
 141                 return err;
 142         if (put_user(info.channel, &src->channel) ||
 143             put_user(info.offset, &src->offset) ||
 144             put_user(info.first, &src->first) ||
 145             put_user(info.step, &src->step))
 146                 return -EFAULT;
 147         return err;
 148 }
 149
 150 #ifdef CONFIG_X86_X32
 151 /* X32 ABI has the same struct as x86-64 for snd_pcm_channel_info */
 152 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 153                                      struct snd_pcm_channel_info __user *src);
 154 #define snd_pcm_ioctl_channel_info_x32(s, p)    \
 155         snd_pcm_channel_info_user(s, p)
 156 #endif /* CONFIG_X86_X32 */
 157
 158 struct compat_snd_pcm_status64 {
 159         snd_pcm_state_t state;
 160         u8 rsvd[4]; /* alignment */
 161         s64 trigger_tstamp_sec;
 162         s64 trigger_tstamp_nsec;
 163         s64 tstamp_sec;
 164         s64 tstamp_nsec;
 165         u32 appl_ptr;
 166         u32 hw_ptr;
 167         s32 delay;
 168         u32 avail;
 169         u32 avail_max;
 170         u32 overrange;
 171         snd_pcm_state_t suspended_state;
 172         u32 audio_tstamp_data;
 173         s64 audio_tstamp_sec;
 174         s64 audio_tstamp_nsec;
 175         s64 driver_tstamp_sec;
 176         s64 driver_tstamp_nsec;
 177         u32 audio_tstamp_accuracy;
 178         unsigned char reserved[52-4*sizeof(s64)];
 179 } __packed;
 180
 181 static int snd_pcm_status_user_compat64(struct snd_pcm_substream *substream,
 182                                         struct compat_snd_pcm_status64 __user *src,
 183                                         bool ext)
 184 {
 185         struct snd_pcm_status64 status;
 186         struct compat_snd_pcm_status64 compat_status64;
 187         int err;
 188
 189         memset(&status, 0, sizeof(status));
 190         memset(&compat_status64, 0, sizeof(compat_status64));
 191         /*
 192          * with extension, parameters are read/write,
 193          * get audio_tstamp_data from user,
 194          * ignore rest of status structure
 195          */
 196         if (ext && get_user(status.audio_tstamp_data,
 197                                 (u32 __user *)(&src->audio_tstamp_data)))
 198                 return -EFAULT;
 199         err = snd_pcm_status64(substream, &status);
 200         if (err < 0)
 201                 return err;
 202
 203         if (clear_user(src, sizeof(*src)))
 204                 return -EFAULT;
 205
 206         compat_status64 = (struct compat_snd_pcm_status64) {
 207                 .state = status.state,
 208                 .trigger_tstamp_sec = status.trigger_tstamp_sec,
 209                 .trigger_tstamp_nsec = status.trigger_tstamp_nsec,
 210                 .tstamp_sec = status.tstamp_sec,
 211                 .tstamp_nsec = status.tstamp_nsec,
 212                 .appl_ptr = status.appl_ptr,
 213                 .hw_ptr = status.hw_ptr,
 214                 .delay = status.delay,
 215                 .avail = status.avail,
 216                 .avail_max = status.avail_max,
 217                 .overrange = status.overrange,
 218                 .suspended_state = status.suspended_state,
 219                 .audio_tstamp_data = status.audio_tstamp_data,
 220                 .audio_tstamp_sec = status.audio_tstamp_sec,
 221                 .audio_tstamp_nsec = status.audio_tstamp_nsec,
 222                 .driver_tstamp_sec = status.audio_tstamp_sec,
 223                 .driver_tstamp_nsec = status.audio_tstamp_nsec,
 224                 .audio_tstamp_accuracy = status.audio_tstamp_accuracy,
 225         };
 226
 227         if (copy_to_user(src, &compat_status64, sizeof(compat_status64)))
 228                 return -EFAULT;
 229
 230         return err;
 231 }
 232
 233 /* both for HW_PARAMS and HW_REFINE */
 234 static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
 235                                           int refine,
 236                                           struct snd_pcm_hw_params32 __user *data32)
 237 {
 238         struct snd_pcm_hw_params *data;
 239         struct snd_pcm_runtime *runtime;
 240         int err;
 241
 242         if (! (runtime = substream->runtime))
 243                 return -ENOTTY;
 244
 245         data = kmalloc(sizeof(*data), GFP_KERNEL);
 246         if (!data)
 247                 return -ENOMEM;
 248
 249         /* only fifo_size (RO from userspace) is different, so just copy all */
 250         if (copy_from_user(data, data32, sizeof(*data32))) {
 251                 err = -EFAULT;
 252                 goto error;
 253         }
 254
 255         if (refine) {
 256                 err = snd_pcm_hw_refine(substream, data);
 257                 if (err < 0)
 258                         goto error;
 259                 err = fixup_unreferenced_params(substream, data);
 260         } else {
 261                 err = snd_pcm_hw_params(substream, data);
 262         }
 263         if (err < 0)
 264                 goto error;
 265         if (copy_to_user(data32, data, sizeof(*data32)) ||
 266             put_user(data->fifo_size, &data32->fifo_size)) {
 267                 err = -EFAULT;
 268                 goto error;
 269         }
 270
 271         if (! refine) {
 272                 unsigned int new_boundary = recalculate_boundary(runtime);
 273                 if (new_boundary)
 274                         runtime->boundary = new_boundary;
 275         }
 276  error:
 277         kfree(data);
 278         return err;
 279 }
 280
 281
 282 /*
 283  */
 284 struct snd_xferi32 {
 285         s32 result;
 286         u32 buf;
 287         u32 frames;
 288 };
 289
 290 static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream,
 291                                       int dir, struct snd_xferi32 __user *data32)
 292 {
 293         compat_caddr_t buf;
 294         u32 frames;
 295         int err;
 296
 297         if (! substream->runtime)
 298                 return -ENOTTY;
 299         if (substream->stream != dir)
 300                 return -EINVAL;
 301         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 302                 return -EBADFD;
 303
 304         if (get_user(buf, &data32->buf) ||
 305             get_user(frames, &data32->frames))
 306                 return -EFAULT;
 307
 308         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 309                 err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
 310         else
 311                 err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
 312         if (err < 0)
 313                 return err;
 314         /* copy the result */
 315         if (put_user(err, &data32->result))
 316                 return -EFAULT;
 317         return 0;
 318 }
 319
 320
 321 /* snd_xfern needs remapping of bufs */
 322 struct snd_xfern32 {
 323         s32 result;
 324         u32 bufs;  /* this is void **; */
 325         u32 frames;
 326 };
 327
 328 /*
 329  * xfern ioctl nees to copy (up to) 128 pointers on stack.
 330  * although we may pass the copied pointers through f_op->ioctl, but the ioctl
 331  * handler there expands again the same 128 pointers on stack, so it is better
 332  * to handle the function (calling pcm_readv/writev) directly in this handler.
 333  */
 334 static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
 335                                       int dir, struct snd_xfern32 __user *data32)
 336 {
 337         compat_caddr_t buf;
 338         compat_caddr_t __user *bufptr;
 339         u32 frames;
 340         void __user **bufs;
 341         int err, ch, i;
 342
 343         if (! substream->runtime)
 344                 return -ENOTTY;
 345         if (substream->stream != dir)
 346                 return -EINVAL;
 347         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 348                 return -EBADFD;
 349
 350         if ((ch = substream->runtime->channels) > 128)
 351                 return -EINVAL;
 352         if (get_user(buf, &data32->bufs) ||
 353             get_user(frames, &data32->frames))
 354                 return -EFAULT;
 355         bufptr = compat_ptr(buf);
 356         bufs = kmalloc_array(ch, sizeof(void __user *), GFP_KERNEL);
 357         if (bufs == NULL)
 358                 return -ENOMEM;
 359         for (i = 0; i < ch; i++) {
 360                 u32 ptr;
 361                 if (get_user(ptr, bufptr)) {
 362                         kfree(bufs);
 363                         return -EFAULT;
 364                 }
 365                 bufs[i] = compat_ptr(ptr);
 366                 bufptr++;
 367         }
 368         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 369                 err = snd_pcm_lib_writev(substream, bufs, frames);
 370         else
 371                 err = snd_pcm_lib_readv(substream, bufs, frames);
 372         if (err >= 0) {
 373                 if (put_user(err, &data32->result))
 374                         err = -EFAULT;
 375         }
 376         kfree(bufs);
 377         return err;
 378 }
 379
 380 #ifdef CONFIG_X86_X32
 381 /* X32 ABI has 64bit timespec and 64bit alignment */
 382 struct snd_pcm_mmap_status_x32 {
 383         snd_pcm_state_t state;
 384         s32 pad1;
 385         u32 hw_ptr;
 386         u32 pad2; /* alignment */
 387         s64 tstamp_sec;
 388         s64 tstamp_nsec;
 389         snd_pcm_state_t suspended_state;
 390         s32 pad3;
 391         s64 audio_tstamp_sec;
 392         s64 audio_tstamp_nsec;
 393 } __packed;
 394
 395 struct snd_pcm_mmap_control_x32 {
 396         u32 appl_ptr;
 397         u32 avail_min;
 398 };
 399
 400 struct snd_pcm_sync_ptr_x32 {
 401         u32 flags;
 402         u32 rsvd; /* alignment */
 403         union {
 404                 struct snd_pcm_mmap_status_x32 status;
 405                 unsigned char reserved[64];
 406         } s;
 407         union {
 408                 struct snd_pcm_mmap_control_x32 control;
 409                 unsigned char reserved[64];
 410         } c;
 411 } __packed;
 412
 413 static int snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream *substream,
 414                                       struct snd_pcm_sync_ptr_x32 __user *src)
 415 {
 416         struct snd_pcm_runtime *runtime = substream->runtime;
 417         volatile struct snd_pcm_mmap_status *status;
 418         volatile struct snd_pcm_mmap_control *control;
 419         u32 sflags;
 420         struct snd_pcm_mmap_control scontrol;
 421         struct snd_pcm_mmap_status sstatus;
 422         snd_pcm_uframes_t boundary;
 423         int err;
 424
 425         if (snd_BUG_ON(!runtime))
 426                 return -EINVAL;
 427
 428         if (get_user(sflags, &src->flags) ||
 429             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 430             get_user(scontrol.avail_min, &src->c.control.avail_min))
 431                 return -EFAULT;
 432         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
 433                 err = snd_pcm_hwsync(substream);
 434                 if (err < 0)
 435                         return err;
 436         }
 437         status = runtime->status;
 438         control = runtime->control;
 439         boundary = recalculate_boundary(runtime);
 440         if (!boundary)
 441                 boundary = 0x7fffffff;
 442         snd_pcm_stream_lock_irq(substream);
 443         /* FIXME: we should consider the boundary for the sync from app */
 444         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
 445                 control->appl_ptr = scontrol.appl_ptr;
 446         else
 447                 scontrol.appl_ptr = control->appl_ptr % boundary;
 448         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
 449                 control->avail_min = scontrol.avail_min;
 450         else
 451                 scontrol.avail_min = control->avail_min;
 452         sstatus.state = status->state;
 453         sstatus.hw_ptr = status->hw_ptr % boundary;
 454         sstatus.tstamp = status->tstamp;
 455         sstatus.suspended_state = status->suspended_state;
 456         sstatus.audio_tstamp = status->audio_tstamp;
 457         snd_pcm_stream_unlock_irq(substream);
 458         if (put_user(sstatus.state, &src->s.status.state) ||
 459             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
 460             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
 461             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
 462             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
 463             put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
 464             put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
 465             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 466             put_user(scontrol.avail_min, &src->c.control.avail_min))
 467                 return -EFAULT;
 468
 469         return 0;
 470 }
 471 #endif /* CONFIG_X86_X32 */
 472
 473 #ifdef __BIG_ENDIAN
 474 typedef char __pad_before_u32[4];
 475 typedef char __pad_after_u32[0];
 476 #else
 477 typedef char __pad_before_u32[0];
 478 typedef char __pad_after_u32[4];
 479 #endif
 480
 481 /* PCM 2.0.15 API definition had a bug in mmap control; it puts the avail_min
 482  * at the wrong offset due to a typo in padding type.
 483  * The bug hits only 32bit.
 484  * A workaround for incorrect read/write is needed only in 32bit compat mode.
 485  */
 486 struct __snd_pcm_mmap_control64_buggy {
 487         __pad_before_u32 __pad1;
 488         __u32 appl_ptr;
 489         __pad_before_u32 __pad2;        /* SiC! here is the bug */
 490         __pad_before_u32 __pad3;
 491         __u32 avail_min;
 492         __pad_after_uframe __pad4;
 493 };
 494
 495 static int snd_pcm_ioctl_sync_ptr_buggy(struct snd_pcm_substream *substream,
 496                                         struct snd_pcm_sync_ptr __user *_sync_ptr)
 497 {
 498         struct snd_pcm_runtime *runtime = substream->runtime;
 499         struct snd_pcm_sync_ptr sync_ptr;
 500         struct __snd_pcm_mmap_control64_buggy *sync_cp;
 501         volatile struct snd_pcm_mmap_status *status;
 502         volatile struct snd_pcm_mmap_control *control;
 503         int err;
 504
 505         memset(&sync_ptr, 0, sizeof(sync_ptr));
 506         sync_cp = (struct __snd_pcm_mmap_control64_buggy *)&sync_ptr.c.control;
 507         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
 508                 return -EFAULT;
 509         if (copy_from_user(sync_cp, &(_sync_ptr->c.control), sizeof(*sync_cp)))
 510                 return -EFAULT;
 511         status = runtime->status;
 512         control = runtime->control;
 513         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
 514                 err = snd_pcm_hwsync(substream);
 515                 if (err < 0)
 516                         return err;
 517         }
 518         snd_pcm_stream_lock_irq(substream);
 519         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
 520                 err = pcm_lib_apply_appl_ptr(substream, sync_cp->appl_ptr);
 521                 if (err < 0) {
 522                         snd_pcm_stream_unlock_irq(substream);
 523                         return err;
 524                 }
 525         } else {
 526                 sync_cp->appl_ptr = control->appl_ptr;
 527         }
 528         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
 529                 control->avail_min = sync_cp->avail_min;
 530         else
 531                 sync_cp->avail_min = control->avail_min;
 532         sync_ptr.s.status.state = status->state;
 533         sync_ptr.s.status.hw_ptr = status->hw_ptr;
 534         sync_ptr.s.status.tstamp = status->tstamp;
 535         sync_ptr.s.status.suspended_state = status->suspended_state;
 536         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
 537         snd_pcm_stream_unlock_irq(substream);
 538         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
 539                 return -EFAULT;
 540         return 0;
 541 }
 542
 543 /*
 544  */
 545 enum {
 546         SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
 547         SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
 548         SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
 549         SNDRV_PCM_IOCTL_STATUS_COMPAT32 = _IOR('A', 0x20, struct snd_pcm_status32),
 550         SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32 = _IOWR('A', 0x24, struct snd_pcm_status32),
 551         SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
 552         SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
 553         SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
 554         SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
 555         SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
 556         SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
 557         SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
 558         SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
 559         SNDRV_PCM_IOCTL_STATUS_COMPAT64 = _IOR('A', 0x20, struct compat_snd_pcm_status64),
 560         SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64 = _IOWR('A', 0x24, struct compat_snd_pcm_status64),
 561 #ifdef CONFIG_X86_X32
 562         SNDRV_PCM_IOCTL_CHANNEL_INFO_X32 = _IOR('A', 0x32, struct snd_pcm_channel_info),
 563         SNDRV_PCM_IOCTL_SYNC_PTR_X32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr_x32),
 564 #endif /* CONFIG_X86_X32 */
 565 };
 566
 567 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 568 {
 569         struct snd_pcm_file *pcm_file;
 570         struct snd_pcm_substream *substream;
 571         void __user *argp = compat_ptr(arg);
 572
 573         pcm_file = file->private_data;
 574         if (! pcm_file)
 575                 return -ENOTTY;
 576         substream = pcm_file->substream;
 577         if (! substream)
 578                 return -ENOTTY;
 579
 580         /*
 581          * When PCM is used on 32bit mode, we need to disable
 582          * mmap of the old PCM status/control records because
 583          * of the size incompatibility.
 584          */
 585         pcm_file->no_compat_mmap = 1;
 586
 587         switch (cmd) {
 588         case SNDRV_PCM_IOCTL_PVERSION:
 589         case SNDRV_PCM_IOCTL_INFO:
 590         case SNDRV_PCM_IOCTL_TSTAMP:
 591         case SNDRV_PCM_IOCTL_TTSTAMP:
 592         case SNDRV_PCM_IOCTL_USER_PVERSION:
 593         case SNDRV_PCM_IOCTL_HWSYNC:
 594         case SNDRV_PCM_IOCTL_PREPARE:
 595         case SNDRV_PCM_IOCTL_RESET:
 596         case SNDRV_PCM_IOCTL_START:
 597         case SNDRV_PCM_IOCTL_DROP:
 598         case SNDRV_PCM_IOCTL_DRAIN:
 599         case SNDRV_PCM_IOCTL_PAUSE:
 600         case SNDRV_PCM_IOCTL_HW_FREE:
 601         case SNDRV_PCM_IOCTL_RESUME:
 602         case SNDRV_PCM_IOCTL_XRUN:
 603         case SNDRV_PCM_IOCTL_LINK:
 604         case SNDRV_PCM_IOCTL_UNLINK:
 605         case __SNDRV_PCM_IOCTL_SYNC_PTR32:
 606                 return snd_pcm_common_ioctl(file, substream, cmd, argp);
 607         case __SNDRV_PCM_IOCTL_SYNC_PTR64:
 608 #ifdef CONFIG_X86_X32
 609                 if (in_x32_syscall())
 610                         return snd_pcm_ioctl_sync_ptr_x32(substream, argp);
 611 #endif /* CONFIG_X86_X32 */
 612                 return snd_pcm_ioctl_sync_ptr_buggy(substream, argp);
 613         case SNDRV_PCM_IOCTL_HW_REFINE32:
 614                 return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
 615         case SNDRV_PCM_IOCTL_HW_PARAMS32:
 616                 return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
 617         case SNDRV_PCM_IOCTL_SW_PARAMS32:
 618                 return snd_pcm_ioctl_sw_params_compat(substream, argp);
 619         case SNDRV_PCM_IOCTL_STATUS_COMPAT32:
 620                 return snd_pcm_status_user32(substream, argp, false);
 621         case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32:
 622                 return snd_pcm_status_user32(substream, argp, true);
 623         case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
 624                 return snd_pcm_ioctl_channel_info_compat(substream, argp);
 625         case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
 626                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 627         case SNDRV_PCM_IOCTL_READI_FRAMES32:
 628                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 629         case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
 630                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 631         case SNDRV_PCM_IOCTL_READN_FRAMES32:
 632                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 633         case SNDRV_PCM_IOCTL_DELAY32:
 634                 return snd_pcm_ioctl_delay_compat(substream, argp);
 635         case SNDRV_PCM_IOCTL_REWIND32:
 636                 return snd_pcm_ioctl_rewind_compat(substream, argp);
 637         case SNDRV_PCM_IOCTL_FORWARD32:
 638                 return snd_pcm_ioctl_forward_compat(substream, argp);
 639         case SNDRV_PCM_IOCTL_STATUS_COMPAT64:
 640                 return snd_pcm_status_user_compat64(substream, argp, false);
 641         case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64:
 642                 return snd_pcm_status_user_compat64(substream, argp, true);
 643 #ifdef CONFIG_X86_X32
 644         case SNDRV_PCM_IOCTL_CHANNEL_INFO_X32:
 645                 return snd_pcm_ioctl_channel_info_x32(substream, argp);
 646 #endif /* CONFIG_X86_X32 */
 647         }
 648
 649         return -ENOIOCTLCMD;
 650 }