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 #include <linux/slab.h>
  25
  26 static int snd_pcm_ioctl_delay_compat(struct snd_pcm_substream *substream,
  27                                       s32 __user *src)
  28 {
  29         snd_pcm_sframes_t delay;
  30         mm_segment_t fs;
  31         int err;
  32
  33         fs = snd_enter_user();
  34         err = snd_pcm_delay(substream, &delay);
  35         snd_leave_user(fs);
  36         if (err < 0)
  37                 return err;
  38         if (put_user(delay, src))
  39                 return -EFAULT;
  40         return err;
  41 }
  42
  43 static int snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream *substream,
  44                                        u32 __user *src)
  45 {
  46         snd_pcm_uframes_t frames;
  47         int err;
  48
  49         if (get_user(frames, src))
  50                 return -EFAULT;
  51         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  52                 err = snd_pcm_playback_rewind(substream, frames);
  53         else
  54                 err = snd_pcm_capture_rewind(substream, frames);
  55         if (put_user(err, src))
  56                 return -EFAULT;
  57         return err < 0 ? err : 0;
  58 }
  59
  60 static int snd_pcm_ioctl_forward_compat(struct snd_pcm_substream *substream,
  61                                        u32 __user *src)
  62 {
  63         snd_pcm_uframes_t frames;
  64         int err;
  65
  66         if (get_user(frames, src))
  67                 return -EFAULT;
  68         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  69                 err = snd_pcm_playback_forward(substream, frames);
  70         else
  71                 err = snd_pcm_capture_forward(substream, frames);
  72         if (put_user(err, src))
  73                 return -EFAULT;
  74         return err < 0 ? err : 0;
  75 }
  76
  77 struct snd_pcm_hw_params32 {
  78         u32 flags;
  79         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
  80         struct snd_mask mres[5];        /* reserved masks */
  81         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
  82         struct snd_interval ires[9];    /* reserved intervals */
  83         u32 rmask;
  84         u32 cmask;
  85         u32 info;
  86         u32 msbits;
  87         u32 rate_num;
  88         u32 rate_den;
  89         u32 fifo_size;
  90         unsigned char reserved[64];
  91 };
  92
  93 struct snd_pcm_sw_params32 {
  94         s32 tstamp_mode;
  95         u32 period_step;
  96         u32 sleep_min;
  97         u32 avail_min;
  98         u32 xfer_align;
  99         u32 start_threshold;
 100         u32 stop_threshold;
 101         u32 silence_threshold;
 102         u32 silence_size;
 103         u32 boundary;
 104         unsigned char reserved[64];
 105 };
 106
 107 /* recalcuate the boundary within 32bit */
 108 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
 109 {
 110         snd_pcm_uframes_t boundary;
 111
 112         if (! runtime->buffer_size)
 113                 return 0;
 114         boundary = runtime->buffer_size;
 115         while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
 116                 boundary *= 2;
 117         return boundary;
 118 }
 119
 120 static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream,
 121                                           struct snd_pcm_sw_params32 __user *src)
 122 {
 123         struct snd_pcm_sw_params params;
 124         snd_pcm_uframes_t boundary;
 125         int err;
 126
 127         memset(&params, 0, sizeof(params));
 128         if (get_user(params.tstamp_mode, &src->tstamp_mode) ||
 129             get_user(params.period_step, &src->period_step) ||
 130             get_user(params.sleep_min, &src->sleep_min) ||
 131             get_user(params.avail_min, &src->avail_min) ||
 132             get_user(params.xfer_align, &src->xfer_align) ||
 133             get_user(params.start_threshold, &src->start_threshold) ||
 134             get_user(params.stop_threshold, &src->stop_threshold) ||
 135             get_user(params.silence_threshold, &src->silence_threshold) ||
 136             get_user(params.silence_size, &src->silence_size))
 137                 return -EFAULT;
 138         /*
 139          * Check silent_size parameter.  Since we have 64bit boundary,
 140          * silence_size must be compared with the 32bit boundary.
 141          */
 142         boundary = recalculate_boundary(substream->runtime);
 143         if (boundary && params.silence_size >= boundary)
 144                 params.silence_size = substream->runtime->boundary;
 145         err = snd_pcm_sw_params(substream, &params);
 146         if (err < 0)
 147                 return err;
 148         if (boundary && put_user(boundary, &src->boundary))
 149                 return -EFAULT;
 150         return err;
 151 }
 152
 153 struct snd_pcm_channel_info32 {
 154         u32 channel;
 155         u32 offset;
 156         u32 first;
 157         u32 step;
 158 };
 159
 160 static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream,
 161                                              struct snd_pcm_channel_info32 __user *src)
 162 {
 163         struct snd_pcm_channel_info info;
 164         int err;
 165
 166         if (get_user(info.channel, &src->channel) ||
 167             get_user(info.offset, &src->offset) ||
 168             get_user(info.first, &src->first) ||
 169             get_user(info.step, &src->step))
 170                 return -EFAULT;
 171         err = snd_pcm_channel_info(substream, &info);
 172         if (err < 0)
 173                 return err;
 174         if (put_user(info.channel, &src->channel) ||
 175             put_user(info.offset, &src->offset) ||
 176             put_user(info.first, &src->first) ||
 177             put_user(info.step, &src->step))
 178                 return -EFAULT;
 179         return err;
 180 }
 181
 182 struct snd_pcm_status32 {
 183         s32 state;
 184         struct compat_timespec trigger_tstamp;
 185         struct compat_timespec tstamp;
 186         u32 appl_ptr;
 187         u32 hw_ptr;
 188         s32 delay;
 189         u32 avail;
 190         u32 avail_max;
 191         u32 overrange;
 192         s32 suspended_state;
 193         unsigned char reserved[60];
 194 } __attribute__((packed));
 195
 196
 197 static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
 198                                       struct snd_pcm_status32 __user *src)
 199 {
 200         struct snd_pcm_status status;
 201         int err;
 202
 203         err = snd_pcm_status(substream, &status);
 204         if (err < 0)
 205                 return err;
 206
 207         if (clear_user(src, sizeof(*src)))
 208                 return -EFAULT;
 209         if (put_user(status.state, &src->state) ||
 210             put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) ||
 211             put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) ||
 212             put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
 213             put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
 214             put_user(status.appl_ptr, &src->appl_ptr) ||
 215             put_user(status.hw_ptr, &src->hw_ptr) ||
 216             put_user(status.delay, &src->delay) ||
 217             put_user(status.avail, &src->avail) ||
 218             put_user(status.avail_max, &src->avail_max) ||
 219             put_user(status.overrange, &src->overrange) ||
 220             put_user(status.suspended_state, &src->suspended_state))
 221                 return -EFAULT;
 222
 223         return err;
 224 }
 225
 226 /* both for HW_PARAMS and HW_REFINE */
 227 static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
 228                                           int refine,
 229                                           struct snd_pcm_hw_params32 __user *data32)
 230 {
 231         struct snd_pcm_hw_params *data;
 232         struct snd_pcm_runtime *runtime;
 233         int err;
 234
 235         if (! (runtime = substream->runtime))
 236                 return -ENOTTY;
 237
 238         data = kmalloc(sizeof(*data), GFP_KERNEL);
 239         if (!data)
 240                 return -ENOMEM;
 241
 242         /* only fifo_size (RO from userspace) is different, so just copy all */
 243         if (copy_from_user(data, data32, sizeof(*data32))) {
 244                 err = -EFAULT;
 245                 goto error;
 246         }
 247
 248         if (refine)
 249                 err = snd_pcm_hw_refine(substream, data);
 250         else
 251                 err = snd_pcm_hw_params(substream, data);
 252         if (err < 0)
 253                 goto error;
 254         if (copy_to_user(data32, data, sizeof(*data32)) ||
 255             put_user(data->fifo_size, &data32->fifo_size)) {
 256                 err = -EFAULT;
 257                 goto error;
 258         }
 259
 260         if (! refine) {
 261                 unsigned int new_boundary = recalculate_boundary(runtime);
 262                 if (new_boundary)
 263                         runtime->boundary = new_boundary;
 264         }
 265  error:
 266         kfree(data);
 267         return err;
 268 }
 269
 270
 271 /*
 272  */
 273 struct snd_xferi32 {
 274         s32 result;
 275         u32 buf;
 276         u32 frames;
 277 };
 278
 279 static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream,
 280                                       int dir, struct snd_xferi32 __user *data32)
 281 {
 282         compat_caddr_t buf;
 283         u32 frames;
 284         int err;
 285
 286         if (! substream->runtime)
 287                 return -ENOTTY;
 288         if (substream->stream != dir)
 289                 return -EINVAL;
 290         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 291                 return -EBADFD;
 292
 293         if (get_user(buf, &data32->buf) ||
 294             get_user(frames, &data32->frames))
 295                 return -EFAULT;
 296
 297         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 298                 err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
 299         else
 300                 err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
 301         if (err < 0)
 302                 return err;
 303         /* copy the result */
 304         if (put_user(err, &data32->result))
 305                 return -EFAULT;
 306         return 0;
 307 }
 308
 309
 310 /* snd_xfern needs remapping of bufs */
 311 struct snd_xfern32 {
 312         s32 result;
 313         u32 bufs;  /* this is void **; */
 314         u32 frames;
 315 };
 316
 317 /*
 318  * xfern ioctl nees to copy (up to) 128 pointers on stack.
 319  * although we may pass the copied pointers through f_op->ioctl, but the ioctl
 320  * handler there expands again the same 128 pointers on stack, so it is better
 321  * to handle the function (calling pcm_readv/writev) directly in this handler.
 322  */
 323 static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
 324                                       int dir, struct snd_xfern32 __user *data32)
 325 {
 326         compat_caddr_t buf;
 327         compat_caddr_t __user *bufptr;
 328         u32 frames;
 329         void __user **bufs;
 330         int err, ch, i;
 331
 332         if (! substream->runtime)
 333                 return -ENOTTY;
 334         if (substream->stream != dir)
 335                 return -EINVAL;
 336
 337         if ((ch = substream->runtime->channels) > 128)
 338                 return -EINVAL;
 339         if (get_user(buf, &data32->bufs) ||
 340             get_user(frames, &data32->frames))
 341                 return -EFAULT;
 342         bufptr = compat_ptr(buf);
 343         bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL);
 344         if (bufs == NULL)
 345                 return -ENOMEM;
 346         for (i = 0; i < ch; i++) {
 347                 u32 ptr;
 348                 if (get_user(ptr, bufptr)) {
 349                         kfree(bufs);
 350                         return -EFAULT;
 351                 }
 352                 bufs[i] = compat_ptr(ptr);
 353                 bufptr++;
 354         }
 355         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 356                 err = snd_pcm_lib_writev(substream, bufs, frames);
 357         else
 358                 err = snd_pcm_lib_readv(substream, bufs, frames);
 359         if (err >= 0) {
 360                 if (put_user(err, &data32->result))
 361                         err = -EFAULT;
 362         }
 363         kfree(bufs);
 364         return err;
 365 }
 366
 367
 368 struct snd_pcm_mmap_status32 {
 369         s32 state;
 370         s32 pad1;
 371         u32 hw_ptr;
 372         struct compat_timespec tstamp;
 373         s32 suspended_state;
 374 } __attribute__((packed));
 375
 376 struct snd_pcm_mmap_control32 {
 377         u32 appl_ptr;
 378         u32 avail_min;
 379 };
 380
 381 struct snd_pcm_sync_ptr32 {
 382         u32 flags;
 383         union {
 384                 struct snd_pcm_mmap_status32 status;
 385                 unsigned char reserved[64];
 386         } s;
 387         union {
 388                 struct snd_pcm_mmap_control32 control;
 389                 unsigned char reserved[64];
 390         } c;
 391 } __attribute__((packed));
 392
 393 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
 394                                          struct snd_pcm_sync_ptr32 __user *src)
 395 {
 396         struct snd_pcm_runtime *runtime = substream->runtime;
 397         volatile struct snd_pcm_mmap_status *status;
 398         volatile struct snd_pcm_mmap_control *control;
 399         u32 sflags;
 400         struct snd_pcm_mmap_control scontrol;
 401         struct snd_pcm_mmap_status sstatus;
 402         snd_pcm_uframes_t boundary;
 403         int err;
 404
 405         if (snd_BUG_ON(!runtime))
 406                 return -EINVAL;
 407
 408         if (get_user(sflags, &src->flags) ||
 409             get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 410             get_user(scontrol.avail_min, &src->c.control.avail_min))
 411                 return -EFAULT;
 412         if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
 413                 err = snd_pcm_hwsync(substream);
 414                 if (err < 0)
 415                         return err;
 416         }
 417         status = runtime->status;
 418         control = runtime->control;
 419         boundary = recalculate_boundary(runtime);
 420         if (! boundary)
 421                 boundary = 0x7fffffff;
 422         snd_pcm_stream_lock_irq(substream);
 423         /* FIXME: we should consider the boundary for the sync from app */
 424         if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
 425                 control->appl_ptr = scontrol.appl_ptr;
 426         else
 427                 scontrol.appl_ptr = control->appl_ptr % boundary;
 428         if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
 429                 control->avail_min = scontrol.avail_min;
 430         else
 431                 scontrol.avail_min = control->avail_min;
 432         sstatus.state = status->state;
 433         sstatus.hw_ptr = status->hw_ptr % boundary;
 434         sstatus.tstamp = status->tstamp;
 435         sstatus.suspended_state = status->suspended_state;
 436         snd_pcm_stream_unlock_irq(substream);
 437         if (put_user(sstatus.state, &src->s.status.state) ||
 438             put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
 439             put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp.tv_sec) ||
 440             put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp.tv_nsec) ||
 441             put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
 442             put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 443             put_user(scontrol.avail_min, &src->c.control.avail_min))
 444                 return -EFAULT;
 445
 446         return 0;
 447 }
 448
 449
 450 /*
 451  */
 452 enum {
 453         SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
 454         SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
 455         SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
 456         SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32),
 457         SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
 458         SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
 459         SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
 460         SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
 461         SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
 462         SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
 463         SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
 464         SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
 465         SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32),
 466
 467 };
 468
 469 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 470 {
 471         struct snd_pcm_file *pcm_file;
 472         struct snd_pcm_substream *substream;
 473         void __user *argp = compat_ptr(arg);
 474
 475         pcm_file = file->private_data;
 476         if (! pcm_file)
 477                 return -ENOTTY;
 478         substream = pcm_file->substream;
 479         if (! substream)
 480                 return -ENOTTY;
 481
 482         /*
 483          * When PCM is used on 32bit mode, we need to disable
 484          * mmap of PCM status/control records because of the size
 485          * incompatibility.
 486          */
 487         pcm_file->no_compat_mmap = 1;
 488
 489         switch (cmd) {
 490         case SNDRV_PCM_IOCTL_PVERSION:
 491         case SNDRV_PCM_IOCTL_INFO:
 492         case SNDRV_PCM_IOCTL_TSTAMP:
 493         case SNDRV_PCM_IOCTL_TTSTAMP:
 494         case SNDRV_PCM_IOCTL_HWSYNC:
 495         case SNDRV_PCM_IOCTL_PREPARE:
 496         case SNDRV_PCM_IOCTL_RESET:
 497         case SNDRV_PCM_IOCTL_START:
 498         case SNDRV_PCM_IOCTL_DROP:
 499         case SNDRV_PCM_IOCTL_DRAIN:
 500         case SNDRV_PCM_IOCTL_PAUSE:
 501         case SNDRV_PCM_IOCTL_HW_FREE:
 502         case SNDRV_PCM_IOCTL_RESUME:
 503         case SNDRV_PCM_IOCTL_XRUN:
 504         case SNDRV_PCM_IOCTL_LINK:
 505         case SNDRV_PCM_IOCTL_UNLINK:
 506                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 507                         return snd_pcm_playback_ioctl1(file, substream, cmd, argp);
 508                 else
 509                         return snd_pcm_capture_ioctl1(file, substream, cmd, argp);
 510         case SNDRV_PCM_IOCTL_HW_REFINE32:
 511                 return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
 512         case SNDRV_PCM_IOCTL_HW_PARAMS32:
 513                 return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
 514         case SNDRV_PCM_IOCTL_SW_PARAMS32:
 515                 return snd_pcm_ioctl_sw_params_compat(substream, argp);
 516         case SNDRV_PCM_IOCTL_STATUS32:
 517                 return snd_pcm_status_user_compat(substream, argp);
 518         case SNDRV_PCM_IOCTL_SYNC_PTR32:
 519                 return snd_pcm_ioctl_sync_ptr_compat(substream, argp);
 520         case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
 521                 return snd_pcm_ioctl_channel_info_compat(substream, argp);
 522         case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
 523                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 524         case SNDRV_PCM_IOCTL_READI_FRAMES32:
 525                 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 526         case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
 527                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 528         case SNDRV_PCM_IOCTL_READN_FRAMES32:
 529                 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 530         case SNDRV_PCM_IOCTL_DELAY32:
 531                 return snd_pcm_ioctl_delay_compat(substream, argp);
 532         case SNDRV_PCM_IOCTL_REWIND32:
 533                 return snd_pcm_ioctl_rewind_compat(substream, argp);
 534         case SNDRV_PCM_IOCTL_FORWARD32:
 535                 return snd_pcm_ioctl_forward_compat(substream, argp);
 536         }
 537
 538         return -ENOIOCTLCMD;
 539 }