1 /* 2 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com 3 * 4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 6 * All Rights Reserved. 7 * 8 * Author Rickard E. (Rik) Faith <faith@valinux.com> 9 * Author Gareth Hughes <gareth@valinux.com> 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a 12 * copy of this software and associated documentation files (the "Software"), 13 * to deal in the Software without restriction, including without limitation 14 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 15 * and/or sell copies of the Software, and to permit persons to whom the 16 * Software is furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice (including the next 19 * paragraph) shall be included in all copies or substantial portions of the 20 * Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 25 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 28 * OTHER DEALINGS IN THE SOFTWARE. 29 */ 30 31 #include <drm/drmP.h> 32 #include <drm/drm_core.h> 33 #include "drm_legacy.h" 34 #include "drm_internal.h" 35 #include "drm_crtc_internal.h" 36 37 #include <linux/pci.h> 38 #include <linux/export.h> 39 40 static int drm_version(struct drm_device *dev, void *data, 41 struct drm_file *file_priv); 42 43 /* 44 * Get the bus id. 45 * 46 * \param inode device inode. 47 * \param file_priv DRM file private. 48 * \param cmd command. 49 * \param arg user argument, pointing to a drm_unique structure. 50 * \return zero on success or a negative number on failure. 51 * 52 * Copies the bus id from drm_device::unique into user space. 53 */ 54 static int drm_getunique(struct drm_device *dev, void *data, 55 struct drm_file *file_priv) 56 { 57 struct drm_unique *u = data; 58 struct drm_master *master = file_priv->master; 59 60 if (u->unique_len >= master->unique_len) { 61 if (copy_to_user(u->unique, master->unique, master->unique_len)) 62 return -EFAULT; 63 } 64 u->unique_len = master->unique_len; 65 66 return 0; 67 } 68 69 static void 70 drm_unset_busid(struct drm_device *dev, 71 struct drm_master *master) 72 { 73 kfree(master->unique); 74 master->unique = NULL; 75 master->unique_len = 0; 76 } 77 78 /* 79 * Set the bus id. 80 * 81 * \param inode device inode. 82 * \param file_priv DRM file private. 83 * \param cmd command. 84 * \param arg user argument, pointing to a drm_unique structure. 85 * \return zero on success or a negative number on failure. 86 * 87 * Copies the bus id from userspace into drm_device::unique, and verifies that 88 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 89 * in interface version 1.1 and will return EBUSY when setversion has requested 90 * version 1.1 or greater. Also note that KMS is all version 1.1 and later and 91 * UMS was only ever supported on pci devices. 92 */ 93 static int drm_setunique(struct drm_device *dev, void *data, 94 struct drm_file *file_priv) 95 { 96 struct drm_unique *u = data; 97 struct drm_master *master = file_priv->master; 98 int ret; 99 100 if (master->unique_len || master->unique) 101 return -EBUSY; 102 103 if (!u->unique_len || u->unique_len > 1024) 104 return -EINVAL; 105 106 if (drm_core_check_feature(dev, DRIVER_MODESET)) 107 return 0; 108 109 if (WARN_ON(!dev->pdev)) 110 return -EINVAL; 111 112 ret = drm_pci_set_unique(dev, master, u); 113 if (ret) 114 goto err; 115 116 return 0; 117 118 err: 119 drm_unset_busid(dev, master); 120 return ret; 121 } 122 123 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 124 { 125 struct drm_master *master = file_priv->master; 126 int ret; 127 128 if (master->unique != NULL) 129 drm_unset_busid(dev, master); 130 131 if (dev->driver->set_busid) { 132 ret = dev->driver->set_busid(dev, master); 133 if (ret) { 134 drm_unset_busid(dev, master); 135 return ret; 136 } 137 } else { 138 if (WARN(dev->unique == NULL, 139 "No drm_driver.set_busid() implementation provided by " 140 "%ps. Use drm_dev_set_unique() to set the unique " 141 "name explicitly.", dev->driver)) 142 return -EINVAL; 143 144 master->unique = kstrdup(dev->unique, GFP_KERNEL); 145 if (master->unique) 146 master->unique_len = strlen(dev->unique); 147 } 148 149 return 0; 150 } 151 152 /* 153 * Get a mapping information. 154 * 155 * \param inode device inode. 156 * \param file_priv DRM file private. 157 * \param cmd command. 158 * \param arg user argument, pointing to a drm_map structure. 159 * 160 * \return zero on success or a negative number on failure. 161 * 162 * Searches for the mapping with the specified offset and copies its information 163 * into userspace 164 */ 165 static int drm_getmap(struct drm_device *dev, void *data, 166 struct drm_file *file_priv) 167 { 168 struct drm_map *map = data; 169 struct drm_map_list *r_list = NULL; 170 struct list_head *list; 171 int idx; 172 int i; 173 174 idx = map->offset; 175 if (idx < 0) 176 return -EINVAL; 177 178 i = 0; 179 mutex_lock(&dev->struct_mutex); 180 list_for_each(list, &dev->maplist) { 181 if (i == idx) { 182 r_list = list_entry(list, struct drm_map_list, head); 183 break; 184 } 185 i++; 186 } 187 if (!r_list || !r_list->map) { 188 mutex_unlock(&dev->struct_mutex); 189 return -EINVAL; 190 } 191 192 map->offset = r_list->map->offset; 193 map->size = r_list->map->size; 194 map->type = r_list->map->type; 195 map->flags = r_list->map->flags; 196 map->handle = (void *)(unsigned long) r_list->user_token; 197 map->mtrr = arch_phys_wc_index(r_list->map->mtrr); 198 199 mutex_unlock(&dev->struct_mutex); 200 201 return 0; 202 } 203 204 /* 205 * Get client information. 206 * 207 * \param inode device inode. 208 * \param file_priv DRM file private. 209 * \param cmd command. 210 * \param arg user argument, pointing to a drm_client structure. 211 * 212 * \return zero on success or a negative number on failure. 213 * 214 * Searches for the client with the specified index and copies its information 215 * into userspace 216 */ 217 static int drm_getclient(struct drm_device *dev, void *data, 218 struct drm_file *file_priv) 219 { 220 struct drm_client *client = data; 221 222 /* 223 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 224 * not breaking completely. Userspace tools stop enumerating one they 225 * get -EINVAL, hence this is the return value we need to hand back for 226 * no clients tracked. 227 * 228 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 229 * attempt to figure out whether they're authenticated or not. Since 230 * that's the only thing they care about, give it to the directly 231 * instead of walking one giant list. 232 */ 233 if (client->idx == 0) { 234 client->auth = file_priv->authenticated; 235 client->pid = pid_vnr(file_priv->pid); 236 client->uid = from_kuid_munged(current_user_ns(), 237 file_priv->uid); 238 client->magic = 0; 239 client->iocs = 0; 240 241 return 0; 242 } else { 243 return -EINVAL; 244 } 245 } 246 247 /* 248 * Get statistics information. 249 * 250 * \param inode device inode. 251 * \param file_priv DRM file private. 252 * \param cmd command. 253 * \param arg user argument, pointing to a drm_stats structure. 254 * 255 * \return zero on success or a negative number on failure. 256 */ 257 static int drm_getstats(struct drm_device *dev, void *data, 258 struct drm_file *file_priv) 259 { 260 struct drm_stats *stats = data; 261 262 /* Clear stats to prevent userspace from eating its stack garbage. */ 263 memset(stats, 0, sizeof(*stats)); 264 265 return 0; 266 } 267 268 /* 269 * Get device/driver capabilities 270 */ 271 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 272 { 273 struct drm_get_cap *req = data; 274 275 req->value = 0; 276 switch (req->capability) { 277 case DRM_CAP_DUMB_BUFFER: 278 if (dev->driver->dumb_create) 279 req->value = 1; 280 break; 281 case DRM_CAP_VBLANK_HIGH_CRTC: 282 req->value = 1; 283 break; 284 case DRM_CAP_DUMB_PREFERRED_DEPTH: 285 req->value = dev->mode_config.preferred_depth; 286 break; 287 case DRM_CAP_DUMB_PREFER_SHADOW: 288 req->value = dev->mode_config.prefer_shadow; 289 break; 290 case DRM_CAP_PRIME: 291 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 292 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 293 break; 294 case DRM_CAP_TIMESTAMP_MONOTONIC: 295 req->value = drm_timestamp_monotonic; 296 break; 297 case DRM_CAP_ASYNC_PAGE_FLIP: 298 req->value = dev->mode_config.async_page_flip; 299 break; 300 case DRM_CAP_CURSOR_WIDTH: 301 if (dev->mode_config.cursor_width) 302 req->value = dev->mode_config.cursor_width; 303 else 304 req->value = 64; 305 break; 306 case DRM_CAP_CURSOR_HEIGHT: 307 if (dev->mode_config.cursor_height) 308 req->value = dev->mode_config.cursor_height; 309 else 310 req->value = 64; 311 break; 312 case DRM_CAP_ADDFB2_MODIFIERS: 313 req->value = dev->mode_config.allow_fb_modifiers; 314 break; 315 default: 316 return -EINVAL; 317 } 318 return 0; 319 } 320 321 /* 322 * Set device/driver capabilities 323 */ 324 static int 325 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 326 { 327 struct drm_set_client_cap *req = data; 328 329 switch (req->capability) { 330 case DRM_CLIENT_CAP_STEREO_3D: 331 if (req->value > 1) 332 return -EINVAL; 333 file_priv->stereo_allowed = req->value; 334 break; 335 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 336 if (req->value > 1) 337 return -EINVAL; 338 file_priv->universal_planes = req->value; 339 break; 340 case DRM_CLIENT_CAP_ATOMIC: 341 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 342 return -EINVAL; 343 if (req->value > 1) 344 return -EINVAL; 345 file_priv->atomic = req->value; 346 file_priv->universal_planes = req->value; 347 break; 348 default: 349 return -EINVAL; 350 } 351 352 return 0; 353 } 354 355 /* 356 * Setversion ioctl. 357 * 358 * \param inode device inode. 359 * \param file_priv DRM file private. 360 * \param cmd command. 361 * \param arg user argument, pointing to a drm_lock structure. 362 * \return zero on success or negative number on failure. 363 * 364 * Sets the requested interface version 365 */ 366 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 367 { 368 struct drm_set_version *sv = data; 369 int if_version, retcode = 0; 370 371 if (sv->drm_di_major != -1) { 372 if (sv->drm_di_major != DRM_IF_MAJOR || 373 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 374 retcode = -EINVAL; 375 goto done; 376 } 377 if_version = DRM_IF_VERSION(sv->drm_di_major, 378 sv->drm_di_minor); 379 dev->if_version = max(if_version, dev->if_version); 380 if (sv->drm_di_minor >= 1) { 381 /* 382 * Version 1.1 includes tying of DRM to specific device 383 * Version 1.4 has proper PCI domain support 384 */ 385 retcode = drm_set_busid(dev, file_priv); 386 if (retcode) 387 goto done; 388 } 389 } 390 391 if (sv->drm_dd_major != -1) { 392 if (sv->drm_dd_major != dev->driver->major || 393 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 394 dev->driver->minor) { 395 retcode = -EINVAL; 396 goto done; 397 } 398 } 399 400 done: 401 sv->drm_di_major = DRM_IF_MAJOR; 402 sv->drm_di_minor = DRM_IF_MINOR; 403 sv->drm_dd_major = dev->driver->major; 404 sv->drm_dd_minor = dev->driver->minor; 405 406 return retcode; 407 } 408 409 /** 410 * drm_noop - DRM no-op ioctl implemntation 411 * @dev: DRM device for the ioctl 412 * @data: data pointer for the ioctl 413 * @file_priv: DRM file for the ioctl call 414 * 415 * This no-op implementation for drm ioctls is useful for deprecated 416 * functionality where we can't return a failure code because existing userspace 417 * checks the result of the ioctl, but doesn't care about the action. 418 * 419 * Always returns successfully with 0. 420 */ 421 int drm_noop(struct drm_device *dev, void *data, 422 struct drm_file *file_priv) 423 { 424 DRM_DEBUG("\n"); 425 return 0; 426 } 427 EXPORT_SYMBOL(drm_noop); 428 429 /** 430 * drm_invalid_op - DRM invalid ioctl implemntation 431 * @dev: DRM device for the ioctl 432 * @data: data pointer for the ioctl 433 * @file_priv: DRM file for the ioctl call 434 * 435 * This no-op implementation for drm ioctls is useful for deprecated 436 * functionality where we really don't want to allow userspace to call the ioctl 437 * any more. This is the case for old ums interfaces for drivers that 438 * transitioned to kms gradually and so kept the old legacy tables around. This 439 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 440 * use this function. 441 * 442 * Always fails with a return value of -EINVAL. 443 */ 444 int drm_invalid_op(struct drm_device *dev, void *data, 445 struct drm_file *file_priv) 446 { 447 return -EINVAL; 448 } 449 EXPORT_SYMBOL(drm_invalid_op); 450 451 /* 452 * Copy and IOCTL return string to user space 453 */ 454 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 455 { 456 int len; 457 458 /* don't overflow userbuf */ 459 len = strlen(value); 460 if (len > *buf_len) 461 len = *buf_len; 462 463 /* let userspace know exact length of driver value (which could be 464 * larger than the userspace-supplied buffer) */ 465 *buf_len = strlen(value); 466 467 /* finally, try filling in the userbuf */ 468 if (len && buf) 469 if (copy_to_user(buf, value, len)) 470 return -EFAULT; 471 return 0; 472 } 473 474 /* 475 * Get version information 476 * 477 * \param inode device inode. 478 * \param filp file pointer. 479 * \param cmd command. 480 * \param arg user argument, pointing to a drm_version structure. 481 * \return zero on success or negative number on failure. 482 * 483 * Fills in the version information in \p arg. 484 */ 485 static int drm_version(struct drm_device *dev, void *data, 486 struct drm_file *file_priv) 487 { 488 struct drm_version *version = data; 489 int err; 490 491 version->version_major = dev->driver->major; 492 version->version_minor = dev->driver->minor; 493 version->version_patchlevel = dev->driver->patchlevel; 494 err = drm_copy_field(version->name, &version->name_len, 495 dev->driver->name); 496 if (!err) 497 err = drm_copy_field(version->date, &version->date_len, 498 dev->driver->date); 499 if (!err) 500 err = drm_copy_field(version->desc, &version->desc_len, 501 dev->driver->desc); 502 503 return err; 504 } 505 506 /* 507 * drm_ioctl_permit - Check ioctl permissions against caller 508 * 509 * @flags: ioctl permission flags. 510 * @file_priv: Pointer to struct drm_file identifying the caller. 511 * 512 * Checks whether the caller is allowed to run an ioctl with the 513 * indicated permissions. If so, returns zero. Otherwise returns an 514 * error code suitable for ioctl return. 515 */ 516 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 517 { 518 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 519 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 520 return -EACCES; 521 522 /* AUTH is only for authenticated or render client */ 523 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 524 !file_priv->authenticated)) 525 return -EACCES; 526 527 /* MASTER is only for master or control clients */ 528 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && 529 !drm_is_control_client(file_priv))) 530 return -EACCES; 531 532 /* Control clients must be explicitly allowed */ 533 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 534 drm_is_control_client(file_priv))) 535 return -EACCES; 536 537 /* Render clients must be explicitly allowed */ 538 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 539 drm_is_render_client(file_priv))) 540 return -EACCES; 541 542 return 0; 543 } 544 EXPORT_SYMBOL(drm_ioctl_permit); 545 546 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 547 [DRM_IOCTL_NR(ioctl)] = { \ 548 .cmd = ioctl, \ 549 .func = _func, \ 550 .flags = _flags, \ 551 .name = #ioctl \ 552 } 553 554 /* Ioctl table */ 555 static const struct drm_ioctl_desc drm_ioctls[] = { 556 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 557 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW), 558 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 559 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 560 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 561 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED), 562 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 563 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 564 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 565 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 566 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 567 568 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 569 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 570 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 571 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 572 573 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 574 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 575 576 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 577 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 578 579 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 580 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 581 582 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 583 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 584 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 585 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 586 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 587 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 588 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 589 590 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 591 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 592 593 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 594 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 595 596 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 597 598 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 599 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 600 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 601 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 602 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 603 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 604 605 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 606 607 #if IS_ENABLED(CONFIG_AGP) 608 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 609 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 610 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 611 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 612 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 613 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 614 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 615 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 616 #endif 617 618 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 619 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 620 621 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 622 623 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 624 625 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 626 627 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 628 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 629 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 630 631 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 632 633 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 634 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 635 636 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 637 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 638 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 639 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 640 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 641 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 642 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 643 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 644 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 645 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 646 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 647 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 648 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 649 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 650 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 651 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 652 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 653 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 654 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 655 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 656 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 657 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 658 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 659 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 660 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 661 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 662 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 663 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 664 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 665 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 666 }; 667 668 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 669 670 /** 671 * drm_ioctl - ioctl callback implementation for DRM drivers 672 * @filp: file this ioctl is called on 673 * @cmd: ioctl cmd number 674 * @arg: user argument 675 * 676 * Looks up the ioctl function in the ::ioctls table, checking for root 677 * previleges if so required, and dispatches to the respective function. 678 * 679 * Returns: 680 * Zero on success, negative error code on failure. 681 */ 682 long drm_ioctl(struct file *filp, 683 unsigned int cmd, unsigned long arg) 684 { 685 struct drm_file *file_priv = filp->private_data; 686 struct drm_device *dev; 687 const struct drm_ioctl_desc *ioctl = NULL; 688 drm_ioctl_t *func; 689 unsigned int nr = DRM_IOCTL_NR(cmd); 690 int retcode = -EINVAL; 691 char stack_kdata[128]; 692 char *kdata = NULL; 693 unsigned int usize, asize, drv_size; 694 bool is_driver_ioctl; 695 696 dev = file_priv->minor->dev; 697 698 if (drm_device_is_unplugged(dev)) 699 return -ENODEV; 700 701 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 702 703 if (is_driver_ioctl) { 704 /* driver ioctl */ 705 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) 706 goto err_i1; 707 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 708 } else { 709 /* core ioctl */ 710 if (nr >= DRM_CORE_IOCTL_COUNT) 711 goto err_i1; 712 ioctl = &drm_ioctls[nr]; 713 } 714 715 drv_size = _IOC_SIZE(ioctl->cmd); 716 usize = _IOC_SIZE(cmd); 717 asize = max(usize, drv_size); 718 cmd = ioctl->cmd; 719 720 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 721 task_pid_nr(current), 722 (long)old_encode_dev(file_priv->minor->kdev->devt), 723 file_priv->authenticated, ioctl->name); 724 725 /* Do not trust userspace, use our own definition */ 726 func = ioctl->func; 727 728 if (unlikely(!func)) { 729 DRM_DEBUG("no function\n"); 730 retcode = -EINVAL; 731 goto err_i1; 732 } 733 734 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 735 if (unlikely(retcode)) 736 goto err_i1; 737 738 if (cmd & (IOC_IN | IOC_OUT)) { 739 if (asize <= sizeof(stack_kdata)) { 740 kdata = stack_kdata; 741 } else { 742 kdata = kmalloc(asize, GFP_KERNEL); 743 if (!kdata) { 744 retcode = -ENOMEM; 745 goto err_i1; 746 } 747 } 748 if (asize > usize) 749 memset(kdata + usize, 0, asize - usize); 750 } 751 752 if (cmd & IOC_IN) { 753 if (copy_from_user(kdata, (void __user *)arg, 754 usize) != 0) { 755 retcode = -EFAULT; 756 goto err_i1; 757 } 758 } else if (cmd & IOC_OUT) { 759 memset(kdata, 0, usize); 760 } 761 762 /* Enforce sane locking for kms driver ioctls. Core ioctls are 763 * too messy still. */ 764 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || 765 (ioctl->flags & DRM_UNLOCKED)) 766 retcode = func(dev, kdata, file_priv); 767 else { 768 mutex_lock(&drm_global_mutex); 769 retcode = func(dev, kdata, file_priv); 770 mutex_unlock(&drm_global_mutex); 771 } 772 773 if (cmd & IOC_OUT) { 774 if (copy_to_user((void __user *)arg, kdata, 775 usize) != 0) 776 retcode = -EFAULT; 777 } 778 779 err_i1: 780 if (!ioctl) 781 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 782 task_pid_nr(current), 783 (long)old_encode_dev(file_priv->minor->kdev->devt), 784 file_priv->authenticated, cmd, nr); 785 786 if (kdata != stack_kdata) 787 kfree(kdata); 788 if (retcode) 789 DRM_DEBUG("ret = %d\n", retcode); 790 return retcode; 791 } 792 EXPORT_SYMBOL(drm_ioctl); 793 794 /** 795 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 796 * @nr: ioctl number 797 * @flags: where to return the ioctl permission flags 798 * 799 * This ioctl is only used by the vmwgfx driver to augment the access checks 800 * done by the drm core and insofar a pretty decent layering violation. This 801 * shouldn't be used by any drivers. 802 * 803 * Returns: 804 * True if the @nr corresponds to a DRM core ioctl numer, false otherwise. 805 */ 806 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 807 { 808 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 809 return false; 810 811 if (nr >= DRM_CORE_IOCTL_COUNT) 812 return false; 813 814 *flags = drm_ioctls[nr].flags; 815 return true; 816 } 817 EXPORT_SYMBOL(drm_ioctl_flags); 818