sound/core/pcm_compat.c

   1 /*
   2  *   32bit -> 64bit ioctl wrapper for PCM API
   3  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program; if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  *
  19  */
  20
  21 /* This file included from pcm_native.c */
  22
  23 #include <linux/compat.h>
  24
  25 static int snd_pcm_ioctl_delay_compat(snd_pcm_substream_t *substream,
  26                                       s32 __user *src)
  27 {
  28         snd_pcm_sframes_t delay;
  29         mm_segment_t fs;
  30         int err;
  31
  32         fs = snd_enter_user();
  33         err = snd_pcm_delay(substream, &delay);
  34         snd_leave_user(fs);
  35         if (err < 0)
  36                 return err;
  37         if (put_user(delay, src))
  38                 return -EFAULT;
  39         return err;
  40 }
  41
  42 static int snd_pcm_ioctl_rewind_compat(snd_pcm_substream_t *substream,
  43                                        u32 __user *src)
  44 {
  45         snd_pcm_uframes_t frames;
  46         int err;
  47
  48         if (get_user(frames, src))
  49                 return -EFAULT;
  50         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  51                 err = snd_pcm_playback_rewind(substream, frames);
  52         else
  53                 err = snd_pcm_capture_rewind(substream, frames);
  54         if (put_user(err, src))
  55                 return -EFAULT;
  56         return err < 0 ? err : 0;
  57 }
  58
  59 static int snd_pcm_ioctl_forward_compat(snd_pcm_substream_t *substream,
  60                                        u32 __user *src)
  61 {
  62         snd_pcm_uframes_t frames;
  63         int err;
  64
  65         if (get_user(frames, src))
  66                 return -EFAULT;
  67         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  68                 err = snd_pcm_playback_forward(substream, frames);
  69         else
  70                 err = snd_pcm_capture_forward(substream, frames);
  71         if (put_user(err, src))
  72                 return -EFAULT;
  73         return err < 0 ? err : 0;
  74 }
  75
  76 struct sndrv_pcm_hw_params32 {
  77         u32 flags;
  78         struct sndrv_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
  79         struct sndrv_mask mres[5];      /* reserved masks */
  80         struct sndrv_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
  81         struct sndrv_interval ires[9];  /* reserved intervals */
  82         u32 rmask;
  83         u32 cmask;
  84         u32 info;
  85         u32 msbits;
  86         u32 rate_num;
  87         u32 rate_den;
  88         u32 fifo_size;
  89         unsigned char reserved[64];
  90 };
  91
  92 struct sndrv_pcm_sw_params32 {
  93         s32 tstamp_mode;
  94         u32 period_step;
  95         u32 sleep_min;
  96         u32 avail_min;
  97         u32 xfer_align;
  98         u32 start_threshold;
  99         u32 stop_threshold;
 100         u32 silence_threshold;
 101         u32 silence_size;
 102         u32 boundary;
 103         unsigned char reserved[64];
 104 };
 105
 106 static int snd_pcm_ioctl_sw_params_compat(snd_pcm_substream_t *substream,
 107                                           struct sndrv_pcm_sw_params32 __user *src)
 108 {
 109         snd_pcm_sw_params_t params;
 110         int err;
 111
 112         memset(&params, 0, sizeof(params));
 113         if (get_user(params.tstamp_mode, &src->tstamp_mode) ||
 114             get_user(params.period_step, &src->period_step) ||
 115             get_user(params.sleep_min, &src->sleep_min) ||
 116             get_user(params.avail_min, &src->avail_min) ||
 117             get_user(params.xfer_align, &src->xfer_align) ||
 118             get_user(params.start_threshold, &src->start_threshold) ||
 119             get_user(params.stop_threshold, &src->stop_threshold) ||
 120             get_user(params.silence_threshold, &src->silence_threshold) ||
 121             get_user(params.silence_size, &src->silence_size))
 122                 return -EFAULT;
 123         err = snd_pcm_sw_params(substream, &params);
 124         if (err < 0)
 125                 return err;
 126         if (put_user(params.boundary, &src->boundary))
 127                 return -EFAULT;
 128         return err;
 129 }
 130
 131 struct sndrv_pcm_channel_info32 {
 132         u32 channel;
 133         u32 offset;
 134         u32 first;
 135         u32 step;
 136 };
 137
 138 static int snd_pcm_ioctl_channel_info_compat(snd_pcm_substream_t *substream,
 139                                              struct sndrv_pcm_channel_info32 __user *src)
 140 {
 141         snd_pcm_channel_info_t info;
 142         int err;
 143
 144         if (get_user(info.channel, &src->channel) ||
 145             get_user(info.offset, &src->offset) ||
 146             get_user(info.first, &src->first) ||
 147             get_user(info.step, &src->step))
 148                 return -EFAULT;
 149         err = snd_pcm_channel_info(substream, &info);
 150         if (err < 0)
 151                 return err;
 152         if (put_user(info.channel, &src->channel) ||
 153             put_user(info.offset, &src->offset) ||
 154             put_user(info.first, &src->first) ||
 155             put_user(info.step, &src->step))
 156                 return -EFAULT;
 157         return err;
 158 }
 159
 160 struct sndrv_pcm_status32 {
 161         s32 state;
 162         struct compat_timespec trigger_tstamp;
 163         struct compat_timespec tstamp;
 164         u32 appl_ptr;
 165         u32 hw_ptr;
 166         s32 delay;
 167         u32 avail;
 168         u32 avail_max;
 169         u32 overrange;
 170         s32 suspended_state;
 171         unsigned char reserved[60];
 172 } __attribute__((packed));
 173
 174
 175 static int snd_pcm_status_user_compat(snd_pcm_substream_t *substream,
 176                                       struct sndrv_pcm_status32 __user *src)
 177 {
 178         snd_pcm_status_t status;
 179         int err;
 180
 181         err = snd_pcm_status(substream, &status);
 182         if (err < 0)
 183                 return err;
 184
 185         if (put_user(status.state, &src->state) ||
 186             put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) ||
 187             put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) ||
 188             put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
 189             put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
 190             put_user(status.appl_ptr, &src->appl_ptr) ||
 191             put_user(status.hw_ptr, &src->hw_ptr) ||
 192             put_user(status.delay, &src->delay) ||
 193             put_user(status.avail, &src->avail) ||
 194             put_user(status.avail_max, &src->avail_max) ||
 195             put_user(status.overrange, &src->overrange) ||
 196             put_user(status.suspended_state, &src->suspended_state))
 197                 return -EFAULT;
 198
 199         return err;
 200 }
 201
 202 /* recalcuate the boundary within 32bit */
 203 static void recalculate_boundary(snd_pcm_runtime_t *runtime)
 204 {
 205         if (! runtime->buffer_size)
 206                 return;
 207         runtime->boundary = runtime->buffer_size;
 208         while (runtime->boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
 209                 runtime->boundary *= 2;
 210 }
 211
 212 /* both for HW_PARAMS and HW_REFINE */
 213 static int snd_pcm_ioctl_hw_params_compat(snd_pcm_substream_t *substream,
 214                                           int refine,
 215                                           struct sndrv_pcm_hw_params32 __user *data32)
 216 {
 217         struct sndrv_pcm_hw_params *data;
 218         snd_pcm_runtime_t *runtime;
 219         int err;
 220
 221         if (! (runtime = substream->runtime))
 222                 return -ENOTTY;
 223
 224         data = kmalloc(sizeof(*data), GFP_KERNEL);
 225         if (data == NULL)
 226                 return -ENOMEM;
 227         /* only fifo_size is different, so just copy all */
 228         if (copy_from_user(data, data32, sizeof(*data32))) {
 229                 err = -EFAULT;
 230                 goto error;
 231         }
 232         if (refine)
 233                 err = snd_pcm_hw_refine(substream, data);
 234         else
 235                 err = snd_pcm_hw_params(substream, data);
 236         if (err < 0)
 237                 goto error;
 238         if (copy_to_user(data32, data, sizeof(*data32)) ||
 239             put_user(data->fifo_size, &data32->fifo_size)) {
 240                 err = -EFAULT;
 241                 goto error;
 242         }
 243
 244         if (! refine)
 245                 recalculate_boundary(runtime);
 246  error:
 247         kfree(data);
 248         return err;
 249 }
 250
 251
 252 /*
 253  */
 254 struct sndrv_xferi32 {
 255         s32 result;
 256         u32 buf;
 257         u32 frames;
 258 };
 259
 260 static int snd_pcm_ioctl_xferi_compat(snd_pcm_substream_t *substream,
 261                                       int dir, struct sndrv_xferi32 __user *data32)
 262 {
 263         compat_caddr_t buf;
 264         u32 frames;
 265         int err;
 266
 267         if (! substream->runtime)
 268                 return -ENOTTY;
 269         if (substream->stream != dir)
 270                 return -EINVAL;
 271         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 272                 return -EBADFD;
 273
 274         if (get_user(buf, &data32->buf) ||
 275             get_user(frames, &data32->frames))
 276                 return -EFAULT;
 277
 278         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 279                 err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
 280         else
 281                 err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
 282         if (err < 0)
 283                 return err;
 284         /* copy the result */
 285         if (put_user(err, &data32->result))
 286                 return -EFAULT;
 287         return 0;
 288 }
 289
 290
 291 /* snd_xfern needs remapping of bufs */
 292 struct sndrv_xfern32 {
 293         s32 result;
 294         u32 bufs;  /* this is void **; */
 295         u32 frames;
 296 };
 297
 298 /*
 299  * xfern ioctl nees to copy (up to) 128 pointers on stack.
 300  * although we may pass the copied pointers through f_op->ioctl, but the ioctl
 301  * handler there expands again the same 128 pointers on stack, so it is better
 302  * to handle the function (calling pcm_readv/writev) directly in this handler.
 303  */
 304 static int snd_pcm_ioctl_xfern_compat(snd_pcm_substream_t *substream,
 305                                       int dir, struct sndrv_xfern32 __user *data32)
 306 {
 307         compat_caddr_t buf;
 308         compat_caddr_t __user *bufptr;
 309         u32 frames;
 310         void __user **bufs;
 311         int err, ch, i;
 312
 313         if (! substream->runtime)
 314                 return -ENOTTY;
 315         if (substream->stream != dir)
 316                 return -EINVAL;
 317
 318         if ((ch = substream->runtime->channels) > 128)
 319                 return -EINVAL;
 320         if (get_user(buf, &data32->bufs) ||
 321             get_user(frames, &data32->frames))
 322                 return -EFAULT;
 323         bufptr = compat_ptr(buf);
 324         bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL);
 325         if (bufs == NULL)
 326                 return -ENOMEM;
 327         for (i = 0; i < ch; i++) {
 328                 u32 ptr;
 329                 if (get_user(ptr, bufptr)) {
 330                         kfree(bufs);
 331                         return -EFAULT;
 332                 }
 333                 bufs[ch] = compat_ptr(ptr);
 334                 bufptr++;
 335         }
 336         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 337                 err = snd_pcm_lib_writev(substream, bufs, frames);
 338         else
 339                 err = snd_pcm_lib_readv(substream, bufs, frames);
 340         if (err >= 0) {
 341                 if (put_user(err, &data32->result))
 342                         err = -EFAULT;
 343         }
 344         kfree(bufs);
 345         return err;
 346 }
 347
 348
 349 struct sndrv_pcm_mmap_status32 {
 350         s32 state;
 351         s32 pad1;
 352         u32 hw_ptr;
 353         struct compat_timespec tstamp;
 354         s32 suspended_state;
 355 } __attribute__((packed));
 356
 357 struct sndrv_pcm_mmap_control32 {
 358         u32 appl_ptr;
 359         u32 avail_min;
 360 };
 361
 362 struct sndrv_pcm_sync_ptr32 {
 363         u32 flags;
 364         union {
 365                 struct sndrv_pcm_mmap_status32 status;
 366                 unsigned char reserved[64];
 367         } s;
 368         union {
 369                 struct sndrv_pcm_mmap_control32 control;
 370                 unsigned char reserved[64];
 371         } c;
 372 } __attribute__((packed));
 373
 374 static int snd_pcm_ioctl_sync_ptr_compat(snd_pcm_substream_t *substream,
 375                                          struct sndrv_pcm_sync_ptr32 __user *src)
 376 {
 377         snd_pcm_runtime_t *runtime = substream->runtime;
 378         volatile struct sndrv_pcm_mmap_status *status;
 379         volatile struct sndrv_pcm_mmap_control *control;
 380         u32 sflags;
 381         struct sndrv_pcm_mmap_control scontrol;
 382         struct sndrv_pcm_mmap_status sstatus;
 383         int err;
 384
 385         snd_assert(runtime, return -EINVAL);
 386
 387         if (get_user(sflags, &src->flags) ||
 388             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 389             get_user(scontrol.avail_min, &src->c.control.avail_min))
 390                 return -EFAULT;
 391         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
 392                 err = snd_pcm_hwsync(substream);
 393                 if (err < 0)
 394                         return err;
 395         }
 396         status = runtime->status;
 397         control = runtime->control;
 398         snd_pcm_stream_lock_irq(substream);
 399         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
 400                 control->appl_ptr = scontrol.appl_ptr;
 401         else
 402                 scontrol.appl_ptr = control->appl_ptr;
 403         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
 404                 control->avail_min = scontrol.avail_min;
 405         else
 406                 scontrol.avail_min = control->avail_min;
 407         sstatus.state = status->state;
 408         sstatus.hw_ptr = status->hw_ptr;
 409         sstatus.tstamp = status->tstamp;
 410         sstatus.suspended_state = status->suspended_state;
 411         snd_pcm_stream_unlock_irq(substream);
 412         if (put_user(sstatus.state, &src->s.status.state) ||
 413             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
 414             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp.tv_sec) ||
 415             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp.tv_nsec) ||
 416             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
 417             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 418             put_user(scontrol.avail_min, &src->c.control.avail_min))
 419                 return -EFAULT;
 420
 421         return 0;
 422 }
 423
 424
 425 /*
 426  */
 427 enum {
 428         SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct sndrv_pcm_hw_params32),
 429         SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct sndrv_pcm_hw_params32),
 430         SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct sndrv_pcm_sw_params32),
 431         SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct sndrv_pcm_status32),
 432         SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
 433         SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct sndrv_pcm_channel_info32),
 434         SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
 435         SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
 436         SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct sndrv_xferi32),
 437         SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct sndrv_xferi32),
 438         SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct sndrv_xfern32),
 439         SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct sndrv_xfern32),
 440         SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct sndrv_pcm_sync_ptr32),
 441
 442 };
 443
 444 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 445 {
 446         snd_pcm_file_t *pcm_file;
 447         snd_pcm_substream_t *substream;
 448         void __user *argp = compat_ptr(arg);
 449
 450         pcm_file = file->private_data;
 451         if (! pcm_file)
 452                 return -ENOTTY;
 453         substream = pcm_file->substream;
 454         if (! substream)
 455                 return -ENOTTY;
 456
 457         /*
 458          * When PCM is used on 32bit mode, we need to disable
 459          * mmap of PCM status/control records because of the size
 460          * incompatibility.
 461          */
 462         substream->no_mmap_ctrl = 1;
 463
 464         switch (cmd) {
 465         case SNDRV_PCM_IOCTL_PVERSION:
 466         case SNDRV_PCM_IOCTL_INFO:
 467         case SNDRV_PCM_IOCTL_TSTAMP:
 468         case SNDRV_PCM_IOCTL_HWSYNC:
 469         case SNDRV_PCM_IOCTL_PREPARE:
 470         case SNDRV_PCM_IOCTL_RESET:
 471         case SNDRV_PCM_IOCTL_START:
 472         case SNDRV_PCM_IOCTL_DROP:
 473         case SNDRV_PCM_IOCTL_DRAIN:
 474         case SNDRV_PCM_IOCTL_PAUSE:
 475         case SNDRV_PCM_IOCTL_HW_FREE:
 476         case SNDRV_PCM_IOCTL_RESUME:
 477         case SNDRV_PCM_IOCTL_XRUN:
 478         case SNDRV_PCM_IOCTL_LINK:
 479         case SNDRV_PCM_IOCTL_UNLINK:
 480                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 481                         return snd_pcm_playback_ioctl1(substream, cmd, argp);
 482                 else
 483                         return snd_pcm_capture_ioctl1(substream, cmd, argp);
 484         case SNDRV_PCM_IOCTL_HW_REFINE32:
 485                 return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
 486         case SNDRV_PCM_IOCTL_HW_PARAMS32:
 487                 return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
 488         case SNDRV_PCM_IOCTL_SW_PARAMS32:
 489                 return snd_pcm_ioctl_sw_params_compat(substream, argp);
 490         case SNDRV_PCM_IOCTL_STATUS32:
 491                 return snd_pcm_status_user_compat(substream, argp);
 492         case SNDRV_PCM_IOCTL_SYNC_PTR32:
 493                 return snd_pcm_ioctl_sync_ptr_compat(substream, argp);
 494         case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
 495                 return snd_pcm_ioctl_channel_info_compat(substream, argp);
 496         case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
 497                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 498         case SNDRV_PCM_IOCTL_READI_FRAMES32:
 499                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 500         case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
 501                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 502         case SNDRV_PCM_IOCTL_READN_FRAMES32:
 503                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 504         case SNDRV_PCM_IOCTL_DELAY32:
 505                 return snd_pcm_ioctl_delay_compat(substream, argp);
 506         case SNDRV_PCM_IOCTL_REWIND32:
 507                 return snd_pcm_ioctl_rewind_compat(substream, argp);
 508         case SNDRV_PCM_IOCTL_FORWARD32:
 509                 return snd_pcm_ioctl_forward_compat(substream, argp);
 510         }
 511
 512         return -ENOIOCTLCMD;
 513 }