drm_ioctl.c revision 1.5
1 /* $NetBSD: drm_ioctl.c,v 1.5 2018/08/27 04:58:19 riastradh Exp $ */ 2 3 /* 4 * Created: Fri Jan 8 09:01:26 1999 by faith (at) valinux.com 5 * 6 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 7 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 8 * All Rights Reserved. 9 * 10 * Author Rickard E. (Rik) Faith <faith (at) valinux.com> 11 * Author Gareth Hughes <gareth (at) valinux.com> 12 * 13 * Permission is hereby granted, free of charge, to any person obtaining a 14 * copy of this software and associated documentation files (the "Software"), 15 * to deal in the Software without restriction, including without limitation 16 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 17 * and/or sell copies of the Software, and to permit persons to whom the 18 * Software is furnished to do so, subject to the following conditions: 19 * 20 * The above copyright notice and this permission notice (including the next 21 * paragraph) shall be included in all copies or substantial portions of the 22 * Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 30 * OTHER DEALINGS IN THE SOFTWARE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: drm_ioctl.c,v 1.5 2018/08/27 04:58:19 riastradh Exp $"); 35 36 #include <drm/drmP.h> 37 #include <drm/drm_core.h> 38 #include "drm_legacy.h" 39 #include "drm_internal.h" 40 #include "drm_crtc_internal.h" 41 42 #include <linux/pci.h> 43 #include <linux/export.h> 44 45 static int drm_version(struct drm_device *dev, void *data, 46 struct drm_file *file_priv); 47 48 /* 49 * Get the bus id. 50 * 51 * \param inode device inode. 52 * \param file_priv DRM file private. 53 * \param cmd command. 54 * \param arg user argument, pointing to a drm_unique structure. 55 * \return zero on success or a negative number on failure. 56 * 57 * Copies the bus id from drm_device::unique into user space. 58 */ 59 static int drm_getunique(struct drm_device *dev, void *data, 60 struct drm_file *file_priv) 61 { 62 struct drm_unique *u = data; 63 struct drm_master *master = file_priv->master; 64 65 if (u->unique_len >= master->unique_len) { 66 if (copy_to_user(u->unique, master->unique, master->unique_len)) 67 return -EFAULT; 68 } 69 u->unique_len = master->unique_len; 70 71 return 0; 72 } 73 74 static void 75 drm_unset_busid(struct drm_device *dev, 76 struct drm_master *master) 77 { 78 kfree(master->unique); 79 master->unique = NULL; 80 master->unique_len = 0; 81 } 82 83 /* 84 * Set the bus id. 85 * 86 * \param inode device inode. 87 * \param file_priv DRM file private. 88 * \param cmd command. 89 * \param arg user argument, pointing to a drm_unique structure. 90 * \return zero on success or a negative number on failure. 91 * 92 * Copies the bus id from userspace into drm_device::unique, and verifies that 93 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 94 * in interface version 1.1 and will return EBUSY when setversion has requested 95 * version 1.1 or greater. Also note that KMS is all version 1.1 and later and 96 * UMS was only ever supported on pci devices. 97 */ 98 static int drm_setunique(struct drm_device *dev, void *data, 99 struct drm_file *file_priv) 100 { 101 struct drm_unique *u = data; 102 struct drm_master *master = file_priv->master; 103 int ret; 104 105 if (master->unique_len || master->unique) 106 return -EBUSY; 107 108 if (!u->unique_len || u->unique_len > 1024) 109 return -EINVAL; 110 111 if (drm_core_check_feature(dev, DRIVER_MODESET)) 112 return 0; 113 114 if (WARN_ON(!dev->pdev)) 115 return -EINVAL; 116 117 ret = drm_pci_set_unique(dev, master, u); 118 if (ret) 119 goto err; 120 121 return 0; 122 123 err: 124 drm_unset_busid(dev, master); 125 return ret; 126 } 127 128 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 129 { 130 struct drm_master *master = file_priv->master; 131 int ret; 132 133 if (master->unique != NULL) 134 drm_unset_busid(dev, master); 135 136 if (dev->driver->set_busid) { 137 ret = dev->driver->set_busid(dev, master); 138 if (ret) { 139 drm_unset_busid(dev, master); 140 return ret; 141 } 142 } else { 143 if (WARN(dev->unique == NULL, 144 "No drm_driver.set_busid() implementation provided by " 145 "%ps. Use drm_dev_set_unique() to set the unique " 146 "name explicitly.", dev->driver)) 147 return -EINVAL; 148 149 master->unique = kstrdup(dev->unique, GFP_KERNEL); 150 if (master->unique) 151 master->unique_len = strlen(dev->unique); 152 } 153 154 return 0; 155 } 156 157 /* 158 * Get a mapping information. 159 * 160 * \param inode device inode. 161 * \param file_priv DRM file private. 162 * \param cmd command. 163 * \param arg user argument, pointing to a drm_map structure. 164 * 165 * \return zero on success or a negative number on failure. 166 * 167 * Searches for the mapping with the specified offset and copies its information 168 * into userspace 169 */ 170 static int drm_getmap(struct drm_device *dev, void *data, 171 struct drm_file *file_priv) 172 { 173 struct drm_map *map = data; 174 struct drm_map_list *r_list = NULL; 175 struct list_head *list; 176 int idx; 177 int i; 178 179 idx = map->offset; 180 if (idx < 0) 181 return -EINVAL; 182 183 i = 0; 184 mutex_lock(&dev->struct_mutex); 185 list_for_each(list, &dev->maplist) { 186 if (i == idx) { 187 r_list = list_entry(list, struct drm_map_list, head); 188 break; 189 } 190 i++; 191 } 192 if (!r_list || !r_list->map) { 193 mutex_unlock(&dev->struct_mutex); 194 return -EINVAL; 195 } 196 197 map->offset = r_list->map->offset; 198 map->size = r_list->map->size; 199 map->type = r_list->map->type; 200 map->flags = r_list->map->flags; 201 map->handle = (void *)(unsigned long) r_list->user_token; 202 map->mtrr = arch_phys_wc_index(r_list->map->mtrr); 203 204 mutex_unlock(&dev->struct_mutex); 205 206 return 0; 207 } 208 209 /* 210 * Get client information. 211 * 212 * \param inode device inode. 213 * \param file_priv DRM file private. 214 * \param cmd command. 215 * \param arg user argument, pointing to a drm_client structure. 216 * 217 * \return zero on success or a negative number on failure. 218 * 219 * Searches for the client with the specified index and copies its information 220 * into userspace 221 */ 222 static int drm_getclient(struct drm_device *dev, void *data, 223 struct drm_file *file_priv) 224 { 225 struct drm_client *client = data; 226 227 /* 228 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 229 * not breaking completely. Userspace tools stop enumerating one they 230 * get -EINVAL, hence this is the return value we need to hand back for 231 * no clients tracked. 232 * 233 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 234 * attempt to figure out whether they're authenticated or not. Since 235 * that's the only thing they care about, give it to the directly 236 * instead of walking one giant list. 237 */ 238 if (client->idx == 0) { 239 client->auth = file_priv->authenticated; 240 #ifdef __NetBSD__ /* XXX Too scary to contemplate. */ 241 client->pid = curproc->p_pid; 242 client->uid = kauth_cred_geteuid(curproc->p_cred); 243 #else 244 client->pid = pid_vnr(file_priv->pid); 245 client->uid = from_kuid_munged(current_user_ns(), 246 file_priv->uid); 247 #endif 248 client->magic = 0; 249 client->iocs = 0; 250 251 return 0; 252 } else { 253 return -EINVAL; 254 } 255 } 256 257 /* 258 * Get statistics information. 259 * 260 * \param inode device inode. 261 * \param file_priv DRM file private. 262 * \param cmd command. 263 * \param arg user argument, pointing to a drm_stats structure. 264 * 265 * \return zero on success or a negative number on failure. 266 */ 267 static int drm_getstats(struct drm_device *dev, void *data, 268 struct drm_file *file_priv) 269 { 270 struct drm_stats *stats = data; 271 272 /* Clear stats to prevent userspace from eating its stack garbage. */ 273 memset(stats, 0, sizeof(*stats)); 274 275 return 0; 276 } 277 278 /* 279 * Get device/driver capabilities 280 */ 281 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 282 { 283 struct drm_get_cap *req = data; 284 285 req->value = 0; 286 switch (req->capability) { 287 case DRM_CAP_DUMB_BUFFER: 288 if (dev->driver->dumb_create) 289 req->value = 1; 290 break; 291 case DRM_CAP_VBLANK_HIGH_CRTC: 292 req->value = 1; 293 break; 294 case DRM_CAP_DUMB_PREFERRED_DEPTH: 295 req->value = dev->mode_config.preferred_depth; 296 break; 297 case DRM_CAP_DUMB_PREFER_SHADOW: 298 req->value = dev->mode_config.prefer_shadow; 299 break; 300 case DRM_CAP_PRIME: 301 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 302 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 303 break; 304 case DRM_CAP_TIMESTAMP_MONOTONIC: 305 req->value = drm_timestamp_monotonic; 306 break; 307 case DRM_CAP_ASYNC_PAGE_FLIP: 308 req->value = dev->mode_config.async_page_flip; 309 break; 310 case DRM_CAP_CURSOR_WIDTH: 311 if (dev->mode_config.cursor_width) 312 req->value = dev->mode_config.cursor_width; 313 else 314 req->value = 64; 315 break; 316 case DRM_CAP_CURSOR_HEIGHT: 317 if (dev->mode_config.cursor_height) 318 req->value = dev->mode_config.cursor_height; 319 else 320 req->value = 64; 321 break; 322 case DRM_CAP_ADDFB2_MODIFIERS: 323 req->value = dev->mode_config.allow_fb_modifiers; 324 break; 325 default: 326 return -EINVAL; 327 } 328 return 0; 329 } 330 331 /* 332 * Set device/driver capabilities 333 */ 334 static int 335 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 336 { 337 struct drm_set_client_cap *req = data; 338 339 switch (req->capability) { 340 case DRM_CLIENT_CAP_STEREO_3D: 341 if (req->value > 1) 342 return -EINVAL; 343 file_priv->stereo_allowed = req->value; 344 break; 345 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 346 if (req->value > 1) 347 return -EINVAL; 348 file_priv->universal_planes = req->value; 349 break; 350 case DRM_CLIENT_CAP_ATOMIC: 351 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 352 return -EINVAL; 353 if (req->value > 1) 354 return -EINVAL; 355 file_priv->atomic = req->value; 356 file_priv->universal_planes = req->value; 357 break; 358 default: 359 return -EINVAL; 360 } 361 362 return 0; 363 } 364 365 /* 366 * Setversion ioctl. 367 * 368 * \param inode device inode. 369 * \param file_priv DRM file private. 370 * \param cmd command. 371 * \param arg user argument, pointing to a drm_lock structure. 372 * \return zero on success or negative number on failure. 373 * 374 * Sets the requested interface version 375 */ 376 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 377 { 378 struct drm_set_version *sv = data; 379 int if_version, retcode = 0; 380 381 if (sv->drm_di_major != -1) { 382 if (sv->drm_di_major != DRM_IF_MAJOR || 383 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 384 retcode = -EINVAL; 385 goto done; 386 } 387 if_version = DRM_IF_VERSION(sv->drm_di_major, 388 sv->drm_di_minor); 389 dev->if_version = max(if_version, dev->if_version); 390 if (sv->drm_di_minor >= 1) { 391 /* 392 * Version 1.1 includes tying of DRM to specific device 393 * Version 1.4 has proper PCI domain support 394 */ 395 retcode = drm_set_busid(dev, file_priv); 396 if (retcode) 397 goto done; 398 } 399 } 400 401 if (sv->drm_dd_major != -1) { 402 if (sv->drm_dd_major != dev->driver->major || 403 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 404 dev->driver->minor) { 405 retcode = -EINVAL; 406 goto done; 407 } 408 } 409 410 done: 411 sv->drm_di_major = DRM_IF_MAJOR; 412 sv->drm_di_minor = DRM_IF_MINOR; 413 sv->drm_dd_major = dev->driver->major; 414 sv->drm_dd_minor = dev->driver->minor; 415 416 return retcode; 417 } 418 419 /** 420 * drm_noop - DRM no-op ioctl implemntation 421 * @dev: DRM device for the ioctl 422 * @data: data pointer for the ioctl 423 * @file_priv: DRM file for the ioctl call 424 * 425 * This no-op implementation for drm ioctls is useful for deprecated 426 * functionality where we can't return a failure code because existing userspace 427 * checks the result of the ioctl, but doesn't care about the action. 428 * 429 * Always returns successfully with 0. 430 */ 431 int drm_noop(struct drm_device *dev, void *data, 432 struct drm_file *file_priv) 433 { 434 DRM_DEBUG("\n"); 435 return 0; 436 } 437 EXPORT_SYMBOL(drm_noop); 438 439 /** 440 * drm_invalid_op - DRM invalid ioctl implemntation 441 * @dev: DRM device for the ioctl 442 * @data: data pointer for the ioctl 443 * @file_priv: DRM file for the ioctl call 444 * 445 * This no-op implementation for drm ioctls is useful for deprecated 446 * functionality where we really don't want to allow userspace to call the ioctl 447 * any more. This is the case for old ums interfaces for drivers that 448 * transitioned to kms gradually and so kept the old legacy tables around. This 449 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 450 * use this function. 451 * 452 * Always fails with a return value of -EINVAL. 453 */ 454 int drm_invalid_op(struct drm_device *dev, void *data, 455 struct drm_file *file_priv) 456 { 457 return -EINVAL; 458 } 459 EXPORT_SYMBOL(drm_invalid_op); 460 461 /* 462 * Copy and IOCTL return string to user space 463 */ 464 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 465 { 466 int len; 467 468 /* don't overflow userbuf */ 469 len = strlen(value); 470 if (len > *buf_len) 471 len = *buf_len; 472 473 /* let userspace know exact length of driver value (which could be 474 * larger than the userspace-supplied buffer) */ 475 *buf_len = strlen(value); 476 477 /* finally, try filling in the userbuf */ 478 if (len && buf) 479 if (copy_to_user(buf, value, len)) 480 return -EFAULT; 481 return 0; 482 } 483 484 /* 485 * Get version information 486 * 487 * \param inode device inode. 488 * \param filp file pointer. 489 * \param cmd command. 490 * \param arg user argument, pointing to a drm_version structure. 491 * \return zero on success or negative number on failure. 492 * 493 * Fills in the version information in \p arg. 494 */ 495 static int drm_version(struct drm_device *dev, void *data, 496 struct drm_file *file_priv) 497 { 498 struct drm_version *version = data; 499 int err; 500 501 version->version_major = dev->driver->major; 502 version->version_minor = dev->driver->minor; 503 version->version_patchlevel = dev->driver->patchlevel; 504 err = drm_copy_field(version->name, &version->name_len, 505 dev->driver->name); 506 if (!err) 507 err = drm_copy_field(version->date, &version->date_len, 508 dev->driver->date); 509 if (!err) 510 err = drm_copy_field(version->desc, &version->desc_len, 511 dev->driver->desc); 512 513 return err; 514 } 515 516 /* 517 * drm_ioctl_permit - Check ioctl permissions against caller 518 * 519 * @flags: ioctl permission flags. 520 * @file_priv: Pointer to struct drm_file identifying the caller. 521 * 522 * Checks whether the caller is allowed to run an ioctl with the 523 * indicated permissions. If so, returns zero. Otherwise returns an 524 * error code suitable for ioctl return. 525 */ 526 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 527 { 528 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 529 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 530 return -EACCES; 531 532 /* AUTH is only for authenticated or render client */ 533 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 534 !file_priv->authenticated)) 535 return -EACCES; 536 537 /* MASTER is only for master or control clients */ 538 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && 539 !drm_is_control_client(file_priv))) 540 return -EACCES; 541 542 /* Control clients must be explicitly allowed */ 543 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 544 drm_is_control_client(file_priv))) 545 return -EACCES; 546 547 /* Render clients must be explicitly allowed */ 548 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 549 drm_is_render_client(file_priv))) 550 return -EACCES; 551 552 return 0; 553 } 554 EXPORT_SYMBOL(drm_ioctl_permit); 555 556 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 557 [DRM_IOCTL_NR(ioctl)] = { \ 558 .cmd = ioctl, \ 559 .func = _func, \ 560 .flags = _flags, \ 561 .name = #ioctl \ 562 } 563 564 /* Ioctl table */ 565 static const struct drm_ioctl_desc drm_ioctls[] = { 566 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 567 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW), 568 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 569 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 570 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 571 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED), 572 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 573 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 574 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 575 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 576 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 577 578 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 579 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 580 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 581 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 582 583 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 584 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 585 586 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 587 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 588 589 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 590 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 591 592 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 593 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 594 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 595 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 596 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 597 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 598 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 599 600 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 601 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 602 603 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 604 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 605 606 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 607 608 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 609 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 610 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 611 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 612 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 613 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 614 615 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 616 617 #if IS_ENABLED(CONFIG_AGP) 618 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 619 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 620 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 621 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 622 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 623 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 624 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 625 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 626 #endif 627 628 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 629 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 630 631 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 632 633 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 634 635 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 636 637 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 638 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 639 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 640 641 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 642 643 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 644 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 645 646 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 647 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 648 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 649 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 650 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 651 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 652 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 653 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 654 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 655 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 656 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 657 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 658 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 659 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 660 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 661 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 662 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 663 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 664 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 665 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 666 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 667 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 668 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 669 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 670 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 671 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 672 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 673 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 674 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 675 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 676 }; 677 678 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 679 680 /** 681 * drm_ioctl - ioctl callback implementation for DRM drivers 682 * @filp: file this ioctl is called on 683 * @cmd: ioctl cmd number 684 * @arg: user argument 685 * 686 * Looks up the ioctl function in the ::ioctls table, checking for root 687 * previleges if so required, and dispatches to the respective function. 688 * 689 * Returns: 690 * Zero on success, negative error code on failure. 691 */ 692 long drm_ioctl(struct file *filp, 693 unsigned int cmd, unsigned long arg) 694 { 695 struct drm_file *file_priv = filp->private_data; 696 struct drm_device *dev; 697 const struct drm_ioctl_desc *ioctl = NULL; 698 drm_ioctl_t *func; 699 unsigned int nr = DRM_IOCTL_NR(cmd); 700 int retcode = -EINVAL; 701 char stack_kdata[128]; 702 char *kdata = NULL; 703 unsigned int usize, asize, drv_size; 704 bool is_driver_ioctl; 705 706 dev = file_priv->minor->dev; 707 708 if (drm_device_is_unplugged(dev)) 709 return -ENODEV; 710 711 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 712 713 if (is_driver_ioctl) { 714 /* driver ioctl */ 715 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) 716 goto err_i1; 717 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 718 } else { 719 /* core ioctl */ 720 if (nr >= DRM_CORE_IOCTL_COUNT) 721 goto err_i1; 722 ioctl = &drm_ioctls[nr]; 723 } 724 725 drv_size = _IOC_SIZE(ioctl->cmd); 726 usize = _IOC_SIZE(cmd); 727 asize = max(usize, drv_size); 728 cmd = ioctl->cmd; 729 730 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 731 task_pid_nr(current), 732 (long)old_encode_dev(file_priv->minor->kdev->devt), 733 file_priv->authenticated, ioctl->name); 734 735 /* Do not trust userspace, use our own definition */ 736 func = ioctl->func; 737 738 if (unlikely(!func)) { 739 DRM_DEBUG("no function\n"); 740 retcode = -EINVAL; 741 goto err_i1; 742 } 743 744 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 745 if (unlikely(retcode)) 746 goto err_i1; 747 748 if (cmd & (IOC_IN | IOC_OUT)) { 749 if (asize <= sizeof(stack_kdata)) { 750 kdata = stack_kdata; 751 } else { 752 kdata = kmalloc(asize, GFP_KERNEL); 753 if (!kdata) { 754 retcode = -ENOMEM; 755 goto err_i1; 756 } 757 } 758 if (asize > usize) 759 memset(kdata + usize, 0, asize - usize); 760 } 761 762 if (cmd & IOC_IN) { 763 if (copy_from_user(kdata, (void __user *)arg, 764 usize) != 0) { 765 retcode = -EFAULT; 766 goto err_i1; 767 } 768 } else if (cmd & IOC_OUT) { 769 memset(kdata, 0, usize); 770 } 771 772 /* Enforce sane locking for kms driver ioctls. Core ioctls are 773 * too messy still. */ 774 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || 775 (ioctl->flags & DRM_UNLOCKED)) 776 retcode = func(dev, kdata, file_priv); 777 else { 778 mutex_lock(&drm_global_mutex); 779 retcode = func(dev, kdata, file_priv); 780 mutex_unlock(&drm_global_mutex); 781 } 782 783 if (cmd & IOC_OUT) { 784 if (copy_to_user((void __user *)arg, kdata, 785 usize) != 0) 786 retcode = -EFAULT; 787 } 788 789 err_i1: 790 if (!ioctl) 791 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 792 task_pid_nr(current), 793 (long)old_encode_dev(file_priv->minor->kdev->devt), 794 file_priv->authenticated, cmd, nr); 795 796 if (kdata != stack_kdata) 797 kfree(kdata); 798 if (retcode) 799 DRM_DEBUG("ret = %d\n", retcode); 800 return retcode; 801 } 802 EXPORT_SYMBOL(drm_ioctl); 803 804 /** 805 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 806 * @nr: ioctl number 807 * @flags: where to return the ioctl permission flags 808 * 809 * This ioctl is only used by the vmwgfx driver to augment the access checks 810 * done by the drm core and insofar a pretty decent layering violation. This 811 * shouldn't be used by any drivers. 812 * 813 * Returns: 814 * True if the @nr corresponds to a DRM core ioctl numer, false otherwise. 815 */ 816 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 817 { 818 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 819 return false; 820 821 if (nr >= DRM_CORE_IOCTL_COUNT) 822 return false; 823 824 *flags = drm_ioctls[nr].flags; 825 return true; 826 } 827 EXPORT_SYMBOL(drm_ioctl_flags); 828
Indexes created Wed Oct 15 16:09:53 GMT 2025