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(¶ms, 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, ¶ms); 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 u32 reserved_alignment; 194 struct compat_timespec audio_tstamp; 195 unsigned char reserved[56-sizeof(struct compat_timespec)]; 196 } __attribute__((packed)); 197 198 199 static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream, 200 struct snd_pcm_status32 __user *src) 201 { 202 struct snd_pcm_status status; 203 int err; 204 205 err = snd_pcm_status(substream, &status); 206 if (err < 0) 207 return err; 208 209 if (put_user(status.state, &src->state) || 210 compat_put_timespec(&status.trigger_tstamp, &src->trigger_tstamp) || 211 compat_put_timespec(&status.tstamp, &src->tstamp) || 212 put_user(status.appl_ptr, &src->appl_ptr) || 213 put_user(status.hw_ptr, &src->hw_ptr) || 214 put_user(status.delay, &src->delay) || 215 put_user(status.avail, &src->avail) || 216 put_user(status.avail_max, &src->avail_max) || 217 put_user(status.overrange, &src->overrange) || 218 put_user(status.suspended_state, &src->suspended_state) || 219 compat_put_timespec(&status.audio_tstamp, &src->audio_tstamp)) 220 return -EFAULT; 221 222 return err; 223 } 224 225 /* both for HW_PARAMS and HW_REFINE */ 226 static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream, 227 int refine, 228 struct snd_pcm_hw_params32 __user *data32) 229 { 230 struct snd_pcm_hw_params *data; 231 struct snd_pcm_runtime *runtime; 232 int err; 233 234 if (! (runtime = substream->runtime)) 235 return -ENOTTY; 236 237 /* only fifo_size is different, so just copy all */ 238 data = memdup_user(data32, sizeof(*data32)); 239 if (IS_ERR(data)) 240 return PTR_ERR(data); 241 242 if (refine) 243 err = snd_pcm_hw_refine(substream, data); 244 else 245 err = snd_pcm_hw_params(substream, data); 246 if (err < 0) 247 goto error; 248 if (copy_to_user(data32, data, sizeof(*data32)) || 249 put_user(data->fifo_size, &data32->fifo_size)) { 250 err = -EFAULT; 251 goto error; 252 } 253 254 if (! refine) { 255 unsigned int new_boundary = recalculate_boundary(runtime); 256 if (new_boundary) 257 runtime->boundary = new_boundary; 258 } 259 error: 260 kfree(data); 261 return err; 262 } 263 264 265 /* 266 */ 267 struct snd_xferi32 { 268 s32 result; 269 u32 buf; 270 u32 frames; 271 }; 272 273 static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream, 274 int dir, struct snd_xferi32 __user *data32) 275 { 276 compat_caddr_t buf; 277 u32 frames; 278 int err; 279 280 if (! substream->runtime) 281 return -ENOTTY; 282 if (substream->stream != dir) 283 return -EINVAL; 284 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) 285 return -EBADFD; 286 287 if (get_user(buf, &data32->buf) || 288 get_user(frames, &data32->frames)) 289 return -EFAULT; 290 291 if (dir == SNDRV_PCM_STREAM_PLAYBACK) 292 err = snd_pcm_lib_write(substream, compat_ptr(buf), frames); 293 else 294 err = snd_pcm_lib_read(substream, compat_ptr(buf), frames); 295 if (err < 0) 296 return err; 297 /* copy the result */ 298 if (put_user(err, &data32->result)) 299 return -EFAULT; 300 return 0; 301 } 302 303 304 /* snd_xfern needs remapping of bufs */ 305 struct snd_xfern32 { 306 s32 result; 307 u32 bufs; /* this is void **; */ 308 u32 frames; 309 }; 310 311 /* 312 * xfern ioctl nees to copy (up to) 128 pointers on stack. 313 * although we may pass the copied pointers through f_op->ioctl, but the ioctl 314 * handler there expands again the same 128 pointers on stack, so it is better 315 * to handle the function (calling pcm_readv/writev) directly in this handler. 316 */ 317 static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream, 318 int dir, struct snd_xfern32 __user *data32) 319 { 320 compat_caddr_t buf; 321 compat_caddr_t __user *bufptr; 322 u32 frames; 323 void __user **bufs; 324 int err, ch, i; 325 326 if (! substream->runtime) 327 return -ENOTTY; 328 if (substream->stream != dir) 329 return -EINVAL; 330 331 if ((ch = substream->runtime->channels) > 128) 332 return -EINVAL; 333 if (get_user(buf, &data32->bufs) || 334 get_user(frames, &data32->frames)) 335 return -EFAULT; 336 bufptr = compat_ptr(buf); 337 bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL); 338 if (bufs == NULL) 339 return -ENOMEM; 340 for (i = 0; i < ch; i++) { 341 u32 ptr; 342 if (get_user(ptr, bufptr)) { 343 kfree(bufs); 344 return -EFAULT; 345 } 346 bufs[i] = compat_ptr(ptr); 347 bufptr++; 348 } 349 if (dir == SNDRV_PCM_STREAM_PLAYBACK) 350 err = snd_pcm_lib_writev(substream, bufs, frames); 351 else 352 err = snd_pcm_lib_readv(substream, bufs, frames); 353 if (err >= 0) { 354 if (put_user(err, &data32->result)) 355 err = -EFAULT; 356 } 357 kfree(bufs); 358 return err; 359 } 360 361 362 struct snd_pcm_mmap_status32 { 363 s32 state; 364 s32 pad1; 365 u32 hw_ptr; 366 struct compat_timespec tstamp; 367 s32 suspended_state; 368 struct compat_timespec audio_tstamp; 369 } __attribute__((packed)); 370 371 struct snd_pcm_mmap_control32 { 372 u32 appl_ptr; 373 u32 avail_min; 374 }; 375 376 struct snd_pcm_sync_ptr32 { 377 u32 flags; 378 union { 379 struct snd_pcm_mmap_status32 status; 380 unsigned char reserved[64]; 381 } s; 382 union { 383 struct snd_pcm_mmap_control32 control; 384 unsigned char reserved[64]; 385 } c; 386 } __attribute__((packed)); 387 388 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, 389 struct snd_pcm_sync_ptr32 __user *src) 390 { 391 struct snd_pcm_runtime *runtime = substream->runtime; 392 volatile struct snd_pcm_mmap_status *status; 393 volatile struct snd_pcm_mmap_control *control; 394 u32 sflags; 395 struct snd_pcm_mmap_control scontrol; 396 struct snd_pcm_mmap_status sstatus; 397 snd_pcm_uframes_t boundary; 398 int err; 399 400 if (snd_BUG_ON(!runtime)) 401 return -EINVAL; 402 403 if (get_user(sflags, &src->flags) || 404 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 405 get_user(scontrol.avail_min, &src->c.control.avail_min)) 406 return -EFAULT; 407 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 408 err = snd_pcm_hwsync(substream); 409 if (err < 0) 410 return err; 411 } 412 status = runtime->status; 413 control = runtime->control; 414 boundary = recalculate_boundary(runtime); 415 if (! boundary) 416 boundary = 0x7fffffff; 417 snd_pcm_stream_lock_irq(substream); 418 /* FIXME: we should consider the boundary for the sync from app */ 419 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) 420 control->appl_ptr = scontrol.appl_ptr; 421 else 422 scontrol.appl_ptr = control->appl_ptr % boundary; 423 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 424 control->avail_min = scontrol.avail_min; 425 else 426 scontrol.avail_min = control->avail_min; 427 sstatus.state = status->state; 428 sstatus.hw_ptr = status->hw_ptr % boundary; 429 sstatus.tstamp = status->tstamp; 430 sstatus.suspended_state = status->suspended_state; 431 sstatus.audio_tstamp = status->audio_tstamp; 432 snd_pcm_stream_unlock_irq(substream); 433 if (put_user(sstatus.state, &src->s.status.state) || 434 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || 435 compat_put_timespec(&sstatus.tstamp, &src->s.status.tstamp) || 436 put_user(sstatus.suspended_state, &src->s.status.suspended_state) || 437 compat_put_timespec(&sstatus.audio_tstamp, 438 &src->s.status.audio_tstamp) || 439 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || 440 put_user(scontrol.avail_min, &src->c.control.avail_min)) 441 return -EFAULT; 442 443 return 0; 444 } 445 446 447 /* 448 */ 449 enum { 450 SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32), 451 SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32), 452 SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32), 453 SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32), 454 SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32), 455 SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32), 456 SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32), 457 SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32), 458 SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32), 459 SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32), 460 SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32), 461 SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32), 462 SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32), 463 464 }; 465 466 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 467 { 468 struct snd_pcm_file *pcm_file; 469 struct snd_pcm_substream *substream; 470 void __user *argp = compat_ptr(arg); 471 472 pcm_file = file->private_data; 473 if (! pcm_file) 474 return -ENOTTY; 475 substream = pcm_file->substream; 476 if (! substream) 477 return -ENOTTY; 478 479 /* 480 * When PCM is used on 32bit mode, we need to disable 481 * mmap of PCM status/control records because of the size 482 * incompatibility. 483 */ 484 pcm_file->no_compat_mmap = 1; 485 486 switch (cmd) { 487 case SNDRV_PCM_IOCTL_PVERSION: 488 case SNDRV_PCM_IOCTL_INFO: 489 case SNDRV_PCM_IOCTL_TSTAMP: 490 case SNDRV_PCM_IOCTL_TTSTAMP: 491 case SNDRV_PCM_IOCTL_HWSYNC: 492 case SNDRV_PCM_IOCTL_PREPARE: 493 case SNDRV_PCM_IOCTL_RESET: 494 case SNDRV_PCM_IOCTL_START: 495 case SNDRV_PCM_IOCTL_DROP: 496 case SNDRV_PCM_IOCTL_DRAIN: 497 case SNDRV_PCM_IOCTL_PAUSE: 498 case SNDRV_PCM_IOCTL_HW_FREE: 499 case SNDRV_PCM_IOCTL_RESUME: 500 case SNDRV_PCM_IOCTL_XRUN: 501 case SNDRV_PCM_IOCTL_LINK: 502 case SNDRV_PCM_IOCTL_UNLINK: 503 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 504 return snd_pcm_playback_ioctl1(file, substream, cmd, argp); 505 else 506 return snd_pcm_capture_ioctl1(file, substream, cmd, argp); 507 case SNDRV_PCM_IOCTL_HW_REFINE32: 508 return snd_pcm_ioctl_hw_params_compat(substream, 1, argp); 509 case SNDRV_PCM_IOCTL_HW_PARAMS32: 510 return snd_pcm_ioctl_hw_params_compat(substream, 0, argp); 511 case SNDRV_PCM_IOCTL_SW_PARAMS32: 512 return snd_pcm_ioctl_sw_params_compat(substream, argp); 513 case SNDRV_PCM_IOCTL_STATUS32: 514 return snd_pcm_status_user_compat(substream, argp); 515 case SNDRV_PCM_IOCTL_SYNC_PTR32: 516 return snd_pcm_ioctl_sync_ptr_compat(substream, argp); 517 case SNDRV_PCM_IOCTL_CHANNEL_INFO32: 518 return snd_pcm_ioctl_channel_info_compat(substream, argp); 519 case SNDRV_PCM_IOCTL_WRITEI_FRAMES32: 520 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp); 521 case SNDRV_PCM_IOCTL_READI_FRAMES32: 522 return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp); 523 case SNDRV_PCM_IOCTL_WRITEN_FRAMES32: 524 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp); 525 case SNDRV_PCM_IOCTL_READN_FRAMES32: 526 return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp); 527 case SNDRV_PCM_IOCTL_DELAY32: 528 return snd_pcm_ioctl_delay_compat(substream, argp); 529 case SNDRV_PCM_IOCTL_REWIND32: 530 return snd_pcm_ioctl_rewind_compat(substream, argp); 531 case SNDRV_PCM_IOCTL_FORWARD32: 532 return snd_pcm_ioctl_forward_compat(substream, argp); 533 } 534 535 return -ENOIOCTLCMD; 536 } 537