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 #ifdef CONFIG_X86 40 #include <asm/mtrr.h> 41 #endif 42 43 static int drm_version(struct drm_device *dev, void *data, 44 struct drm_file *file_priv); 45 46 /** 47 * Get the bus id. 48 * 49 * \param inode device inode. 50 * \param file_priv DRM file private. 51 * \param cmd command. 52 * \param arg user argument, pointing to a drm_unique structure. 53 * \return zero on success or a negative number on failure. 54 * 55 * Copies the bus id from drm_device::unique into user space. 56 */ 57 static int drm_getunique(struct drm_device *dev, void *data, 58 struct drm_file *file_priv) 59 { 60 struct drm_unique *u = data; 61 struct drm_master *master = file_priv->master; 62 63 if (u->unique_len >= master->unique_len) { 64 if (copy_to_user(u->unique, master->unique, master->unique_len)) 65 return -EFAULT; 66 } 67 u->unique_len = master->unique_len; 68 69 return 0; 70 } 71 72 static void 73 drm_unset_busid(struct drm_device *dev, 74 struct drm_master *master) 75 { 76 kfree(master->unique); 77 master->unique = NULL; 78 master->unique_len = 0; 79 } 80 81 /** 82 * Set the bus id. 83 * 84 * \param inode device inode. 85 * \param file_priv DRM file private. 86 * \param cmd command. 87 * \param arg user argument, pointing to a drm_unique structure. 88 * \return zero on success or a negative number on failure. 89 * 90 * Copies the bus id from userspace into drm_device::unique, and verifies that 91 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 92 * in interface version 1.1 and will return EBUSY when setversion has requested 93 * version 1.1 or greater. Also note that KMS is all version 1.1 and later and 94 * UMS was only ever supported on pci devices. 95 */ 96 static int drm_setunique(struct drm_device *dev, void *data, 97 struct drm_file *file_priv) 98 { 99 struct drm_unique *u = data; 100 struct drm_master *master = file_priv->master; 101 int ret; 102 103 if (master->unique_len || master->unique) 104 return -EBUSY; 105 106 if (!u->unique_len || u->unique_len > 1024) 107 return -EINVAL; 108 109 if (drm_core_check_feature(dev, DRIVER_MODESET)) 110 return 0; 111 112 if (WARN_ON(!dev->pdev)) 113 return -EINVAL; 114 115 ret = drm_pci_set_unique(dev, master, u); 116 if (ret) 117 goto err; 118 119 return 0; 120 121 err: 122 drm_unset_busid(dev, master); 123 return ret; 124 } 125 126 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 127 { 128 struct drm_master *master = file_priv->master; 129 int ret; 130 131 if (master->unique != NULL) 132 drm_unset_busid(dev, master); 133 134 if (dev->driver->set_busid) { 135 ret = dev->driver->set_busid(dev, master); 136 if (ret) { 137 drm_unset_busid(dev, master); 138 return ret; 139 } 140 } else { 141 if (WARN(dev->unique == NULL, 142 "No drm_driver.set_busid() implementation provided by " 143 "%ps. Use drm_dev_set_unique() to set the unique " 144 "name explicitly.", dev->driver)) 145 return -EINVAL; 146 147 master->unique = kstrdup(dev->unique, GFP_KERNEL); 148 if (master->unique) 149 master->unique_len = strlen(dev->unique); 150 } 151 152 return 0; 153 } 154 155 /** 156 * Get a mapping information. 157 * 158 * \param inode device inode. 159 * \param file_priv DRM file private. 160 * \param cmd command. 161 * \param arg user argument, pointing to a drm_map structure. 162 * 163 * \return zero on success or a negative number on failure. 164 * 165 * Searches for the mapping with the specified offset and copies its information 166 * into userspace 167 */ 168 static int drm_getmap(struct drm_device *dev, void *data, 169 struct drm_file *file_priv) 170 { 171 struct drm_map *map = data; 172 struct drm_map_list *r_list = NULL; 173 struct list_head *list; 174 int idx; 175 int i; 176 177 idx = map->offset; 178 if (idx < 0) 179 return -EINVAL; 180 181 i = 0; 182 mutex_lock(&dev->struct_mutex); 183 list_for_each(list, &dev->maplist) { 184 if (i == idx) { 185 r_list = list_entry(list, struct drm_map_list, head); 186 break; 187 } 188 i++; 189 } 190 if (!r_list || !r_list->map) { 191 mutex_unlock(&dev->struct_mutex); 192 return -EINVAL; 193 } 194 195 map->offset = r_list->map->offset; 196 map->size = r_list->map->size; 197 map->type = r_list->map->type; 198 map->flags = r_list->map->flags; 199 map->handle = (void *)(unsigned long) r_list->user_token; 200 201 #ifdef CONFIG_X86 202 /* 203 * There appears to be exactly one user of the mtrr index: dritest. 204 * It's easy enough to keep it working on non-PAT systems. 205 */ 206 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr); 207 #else 208 map->mtrr = -1; 209 #endif 210 211 mutex_unlock(&dev->struct_mutex); 212 213 return 0; 214 } 215 216 /** 217 * Get client information. 218 * 219 * \param inode device inode. 220 * \param file_priv DRM file private. 221 * \param cmd command. 222 * \param arg user argument, pointing to a drm_client structure. 223 * 224 * \return zero on success or a negative number on failure. 225 * 226 * Searches for the client with the specified index and copies its information 227 * into userspace 228 */ 229 static int drm_getclient(struct drm_device *dev, void *data, 230 struct drm_file *file_priv) 231 { 232 struct drm_client *client = data; 233 234 /* 235 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 236 * not breaking completely. Userspace tools stop enumerating one they 237 * get -EINVAL, hence this is the return value we need to hand back for 238 * no clients tracked. 239 * 240 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 241 * attempt to figure out whether they're authenticated or not. Since 242 * that's the only thing they care about, give it to the directly 243 * instead of walking one giant list. 244 */ 245 if (client->idx == 0) { 246 client->auth = file_priv->authenticated; 247 client->pid = pid_vnr(file_priv->pid); 248 client->uid = from_kuid_munged(current_user_ns(), 249 file_priv->uid); 250 client->magic = 0; 251 client->iocs = 0; 252 253 return 0; 254 } else { 255 return -EINVAL; 256 } 257 } 258 259 /** 260 * Get statistics information. 261 * 262 * \param inode device inode. 263 * \param file_priv DRM file private. 264 * \param cmd command. 265 * \param arg user argument, pointing to a drm_stats structure. 266 * 267 * \return zero on success or a negative number on failure. 268 */ 269 static int drm_getstats(struct drm_device *dev, void *data, 270 struct drm_file *file_priv) 271 { 272 struct drm_stats *stats = data; 273 274 /* Clear stats to prevent userspace from eating its stack garbage. */ 275 memset(stats, 0, sizeof(*stats)); 276 277 return 0; 278 } 279 280 /** 281 * Get device/driver capabilities 282 */ 283 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 284 { 285 struct drm_get_cap *req = data; 286 287 req->value = 0; 288 switch (req->capability) { 289 case DRM_CAP_DUMB_BUFFER: 290 if (dev->driver->dumb_create) 291 req->value = 1; 292 break; 293 case DRM_CAP_VBLANK_HIGH_CRTC: 294 req->value = 1; 295 break; 296 case DRM_CAP_DUMB_PREFERRED_DEPTH: 297 req->value = dev->mode_config.preferred_depth; 298 break; 299 case DRM_CAP_DUMB_PREFER_SHADOW: 300 req->value = dev->mode_config.prefer_shadow; 301 break; 302 case DRM_CAP_PRIME: 303 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 304 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 305 break; 306 case DRM_CAP_TIMESTAMP_MONOTONIC: 307 req->value = drm_timestamp_monotonic; 308 break; 309 case DRM_CAP_ASYNC_PAGE_FLIP: 310 req->value = dev->mode_config.async_page_flip; 311 break; 312 case DRM_CAP_CURSOR_WIDTH: 313 if (dev->mode_config.cursor_width) 314 req->value = dev->mode_config.cursor_width; 315 else 316 req->value = 64; 317 break; 318 case DRM_CAP_CURSOR_HEIGHT: 319 if (dev->mode_config.cursor_height) 320 req->value = dev->mode_config.cursor_height; 321 else 322 req->value = 64; 323 break; 324 case DRM_CAP_ADDFB2_MODIFIERS: 325 req->value = dev->mode_config.allow_fb_modifiers; 326 break; 327 default: 328 return -EINVAL; 329 } 330 return 0; 331 } 332 333 /** 334 * Set device/driver capabilities 335 */ 336 static int 337 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 338 { 339 struct drm_set_client_cap *req = data; 340 341 switch (req->capability) { 342 case DRM_CLIENT_CAP_STEREO_3D: 343 if (req->value > 1) 344 return -EINVAL; 345 file_priv->stereo_allowed = req->value; 346 break; 347 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 348 if (req->value > 1) 349 return -EINVAL; 350 file_priv->universal_planes = req->value; 351 break; 352 case DRM_CLIENT_CAP_ATOMIC: 353 /* for now, hide behind experimental drm.atomic moduleparam */ 354 if (!drm_atomic) 355 return -EINVAL; 356 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 357 return -EINVAL; 358 if (req->value > 1) 359 return -EINVAL; 360 file_priv->atomic = req->value; 361 file_priv->universal_planes = req->value; 362 break; 363 default: 364 return -EINVAL; 365 } 366 367 return 0; 368 } 369 370 /** 371 * Setversion ioctl. 372 * 373 * \param inode device inode. 374 * \param file_priv DRM file private. 375 * \param cmd command. 376 * \param arg user argument, pointing to a drm_lock structure. 377 * \return zero on success or negative number on failure. 378 * 379 * Sets the requested interface version 380 */ 381 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 382 { 383 struct drm_set_version *sv = data; 384 int if_version, retcode = 0; 385 386 if (sv->drm_di_major != -1) { 387 if (sv->drm_di_major != DRM_IF_MAJOR || 388 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 389 retcode = -EINVAL; 390 goto done; 391 } 392 if_version = DRM_IF_VERSION(sv->drm_di_major, 393 sv->drm_di_minor); 394 dev->if_version = max(if_version, dev->if_version); 395 if (sv->drm_di_minor >= 1) { 396 /* 397 * Version 1.1 includes tying of DRM to specific device 398 * Version 1.4 has proper PCI domain support 399 */ 400 retcode = drm_set_busid(dev, file_priv); 401 if (retcode) 402 goto done; 403 } 404 } 405 406 if (sv->drm_dd_major != -1) { 407 if (sv->drm_dd_major != dev->driver->major || 408 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 409 dev->driver->minor) { 410 retcode = -EINVAL; 411 goto done; 412 } 413 } 414 415 done: 416 sv->drm_di_major = DRM_IF_MAJOR; 417 sv->drm_di_minor = DRM_IF_MINOR; 418 sv->drm_dd_major = dev->driver->major; 419 sv->drm_dd_minor = dev->driver->minor; 420 421 return retcode; 422 } 423 424 /** No-op ioctl. */ 425 int drm_noop(struct drm_device *dev, void *data, 426 struct drm_file *file_priv) 427 { 428 DRM_DEBUG("\n"); 429 return 0; 430 } 431 EXPORT_SYMBOL(drm_noop); 432 433 /** 434 * Copy and IOCTL return string to user space 435 */ 436 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 437 { 438 int len; 439 440 /* don't overflow userbuf */ 441 len = strlen(value); 442 if (len > *buf_len) 443 len = *buf_len; 444 445 /* let userspace know exact length of driver value (which could be 446 * larger than the userspace-supplied buffer) */ 447 *buf_len = strlen(value); 448 449 /* finally, try filling in the userbuf */ 450 if (len && buf) 451 if (copy_to_user(buf, value, len)) 452 return -EFAULT; 453 return 0; 454 } 455 456 /** 457 * Get version information 458 * 459 * \param inode device inode. 460 * \param filp file pointer. 461 * \param cmd command. 462 * \param arg user argument, pointing to a drm_version structure. 463 * \return zero on success or negative number on failure. 464 * 465 * Fills in the version information in \p arg. 466 */ 467 static int drm_version(struct drm_device *dev, void *data, 468 struct drm_file *file_priv) 469 { 470 struct drm_version *version = data; 471 int err; 472 473 version->version_major = dev->driver->major; 474 version->version_minor = dev->driver->minor; 475 version->version_patchlevel = dev->driver->patchlevel; 476 err = drm_copy_field(version->name, &version->name_len, 477 dev->driver->name); 478 if (!err) 479 err = drm_copy_field(version->date, &version->date_len, 480 dev->driver->date); 481 if (!err) 482 err = drm_copy_field(version->desc, &version->desc_len, 483 dev->driver->desc); 484 485 return err; 486 } 487 488 /** 489 * drm_ioctl_permit - Check ioctl permissions against caller 490 * 491 * @flags: ioctl permission flags. 492 * @file_priv: Pointer to struct drm_file identifying the caller. 493 * 494 * Checks whether the caller is allowed to run an ioctl with the 495 * indicated permissions. If so, returns zero. Otherwise returns an 496 * error code suitable for ioctl return. 497 */ 498 static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 499 { 500 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 501 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 502 return -EACCES; 503 504 /* AUTH is only for authenticated or render client */ 505 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 506 !file_priv->authenticated)) 507 return -EACCES; 508 509 /* MASTER is only for master or control clients */ 510 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && 511 !drm_is_control_client(file_priv))) 512 return -EACCES; 513 514 /* Control clients must be explicitly allowed */ 515 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 516 drm_is_control_client(file_priv))) 517 return -EACCES; 518 519 /* Render clients must be explicitly allowed */ 520 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 521 drm_is_render_client(file_priv))) 522 return -EACCES; 523 524 return 0; 525 } 526 527 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 528 [DRM_IOCTL_NR(ioctl)] = { \ 529 .cmd = ioctl, \ 530 .func = _func, \ 531 .flags = _flags, \ 532 .name = #ioctl \ 533 } 534 535 /** Ioctl table */ 536 static const struct drm_ioctl_desc drm_ioctls[] = { 537 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW), 538 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 539 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 540 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 541 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED), 542 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 543 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 544 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 545 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 546 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 547 548 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 549 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 550 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 551 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 552 553 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 554 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 555 556 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 557 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 558 559 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 560 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 561 562 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 563 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 564 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 565 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 566 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 567 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 568 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 569 570 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 571 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 572 573 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 574 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 575 576 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 577 578 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 579 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 580 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 581 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 582 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 583 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 584 585 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 586 587 #if __OS_HAS_AGP 588 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 589 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 590 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 591 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 592 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 593 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 594 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 595 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 596 #endif 597 598 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 599 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 600 601 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 602 603 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 604 605 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 606 607 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 608 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 609 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 610 611 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 612 613 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 614 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 615 616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 624 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 625 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 626 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 627 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 628 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 629 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 630 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 631 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 632 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 633 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 634 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 635 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 636 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 637 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 638 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 639 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 640 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 641 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 642 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 643 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 644 }; 645 646 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 647 648 /** 649 * Called whenever a process performs an ioctl on /dev/drm. 650 * 651 * \param inode device inode. 652 * \param file_priv DRM file private. 653 * \param cmd command. 654 * \param arg user argument. 655 * \return zero on success or negative number on failure. 656 * 657 * Looks up the ioctl function in the ::ioctls table, checking for root 658 * previleges if so required, and dispatches to the respective function. 659 */ 660 long drm_ioctl(struct file *filp, 661 unsigned int cmd, unsigned long arg) 662 { 663 struct drm_file *file_priv = filp->private_data; 664 struct drm_device *dev; 665 const struct drm_ioctl_desc *ioctl = NULL; 666 drm_ioctl_t *func; 667 unsigned int nr = DRM_IOCTL_NR(cmd); 668 int retcode = -EINVAL; 669 char stack_kdata[128]; 670 char *kdata = NULL; 671 unsigned int usize, asize, drv_size; 672 673 dev = file_priv->minor->dev; 674 675 if (drm_device_is_unplugged(dev)) 676 return -ENODEV; 677 678 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) { 679 /* driver ioctl */ 680 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) 681 goto err_i1; 682 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 683 } else { 684 /* core ioctl */ 685 if (nr >= DRM_CORE_IOCTL_COUNT) 686 goto err_i1; 687 ioctl = &drm_ioctls[nr]; 688 } 689 690 drv_size = _IOC_SIZE(ioctl->cmd); 691 usize = _IOC_SIZE(cmd); 692 asize = max(usize, drv_size); 693 cmd = ioctl->cmd; 694 695 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 696 task_pid_nr(current), 697 (long)old_encode_dev(file_priv->minor->kdev->devt), 698 file_priv->authenticated, ioctl->name); 699 700 /* Do not trust userspace, use our own definition */ 701 func = ioctl->func; 702 703 if (unlikely(!func)) { 704 DRM_DEBUG("no function\n"); 705 retcode = -EINVAL; 706 goto err_i1; 707 } 708 709 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 710 if (unlikely(retcode)) 711 goto err_i1; 712 713 if (cmd & (IOC_IN | IOC_OUT)) { 714 if (asize <= sizeof(stack_kdata)) { 715 kdata = stack_kdata; 716 } else { 717 kdata = kmalloc(asize, GFP_KERNEL); 718 if (!kdata) { 719 retcode = -ENOMEM; 720 goto err_i1; 721 } 722 } 723 if (asize > usize) 724 memset(kdata + usize, 0, asize - usize); 725 } 726 727 if (cmd & IOC_IN) { 728 if (copy_from_user(kdata, (void __user *)arg, 729 usize) != 0) { 730 retcode = -EFAULT; 731 goto err_i1; 732 } 733 } else if (cmd & IOC_OUT) { 734 memset(kdata, 0, usize); 735 } 736 737 if (ioctl->flags & DRM_UNLOCKED) 738 retcode = func(dev, kdata, file_priv); 739 else { 740 mutex_lock(&drm_global_mutex); 741 retcode = func(dev, kdata, file_priv); 742 mutex_unlock(&drm_global_mutex); 743 } 744 745 if (cmd & IOC_OUT) { 746 if (copy_to_user((void __user *)arg, kdata, 747 usize) != 0) 748 retcode = -EFAULT; 749 } 750 751 err_i1: 752 if (!ioctl) 753 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 754 task_pid_nr(current), 755 (long)old_encode_dev(file_priv->minor->kdev->devt), 756 file_priv->authenticated, cmd, nr); 757 758 if (kdata != stack_kdata) 759 kfree(kdata); 760 if (retcode) 761 DRM_DEBUG("ret = %d\n", retcode); 762 return retcode; 763 } 764 EXPORT_SYMBOL(drm_ioctl); 765 766 /** 767 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 768 * 769 * @nr: Ioctl number. 770 * @flags: Where to return the ioctl permission flags 771 */ 772 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 773 { 774 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 775 return false; 776 777 if (nr >= DRM_CORE_IOCTL_COUNT) 778 return false; 779 780 *flags = drm_ioctls[nr].flags; 781 return true; 782 } 783 EXPORT_SYMBOL(drm_ioctl_flags); 784