drm_ioctl.c revision 1.4.18.2
1 /* $NetBSD: drm_ioctl.c,v 1.4.18.2 2020/04/08 14:08:22 martin 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 1.4.18.2 2020/04/08 14:08:22 martin 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 if (!dev->driver->set_unique) 118 return -ENODEV; 119 120 ret = dev->driver->set_unique(dev, master, u); 121 if (ret) 122 goto err; 123 124 return 0; 125 126 err: 127 drm_unset_busid(dev, master); 128 return ret; 129 } 130 131 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 132 { 133 struct drm_master *master = file_priv->master; 134 int ret; 135 136 if (master->unique != NULL) 137 drm_unset_busid(dev, master); 138 139 if (dev->driver->set_busid) { 140 ret = dev->driver->set_busid(dev, master); 141 if (ret) { 142 drm_unset_busid(dev, master); 143 return ret; 144 } 145 } else { 146 if (WARN(dev->unique == NULL, 147 "No drm_driver.set_busid() implementation provided by " 148 "%ps. Use drm_dev_set_unique() to set the unique " 149 "name explicitly.", dev->driver)) 150 return -EINVAL; 151 152 master->unique = kstrdup(dev->unique, GFP_KERNEL); 153 if (master->unique) 154 master->unique_len = strlen(dev->unique); 155 } 156 157 return 0; 158 } 159 160 /* 161 * Get a mapping information. 162 * 163 * \param inode device inode. 164 * \param file_priv DRM file private. 165 * \param cmd command. 166 * \param arg user argument, pointing to a drm_map structure. 167 * 168 * \return zero on success or a negative number on failure. 169 * 170 * Searches for the mapping with the specified offset and copies its information 171 * into userspace 172 */ 173 static int drm_getmap(struct drm_device *dev, void *data, 174 struct drm_file *file_priv) 175 { 176 struct drm_map *map = data; 177 struct drm_map_list *r_list = NULL; 178 struct list_head *list; 179 int idx; 180 int i; 181 182 idx = map->offset; 183 if (idx < 0) 184 return -EINVAL; 185 186 i = 0; 187 mutex_lock(&dev->struct_mutex); 188 list_for_each(list, &dev->maplist) { 189 if (i == idx) { 190 r_list = list_entry(list, struct drm_map_list, head); 191 break; 192 } 193 i++; 194 } 195 if (!r_list || !r_list->map) { 196 mutex_unlock(&dev->struct_mutex); 197 return -EINVAL; 198 } 199 200 map->offset = r_list->map->offset; 201 map->size = r_list->map->size; 202 map->type = r_list->map->type; 203 map->flags = r_list->map->flags; 204 map->handle = (void *)(unsigned long) r_list->user_token; 205 map->mtrr = arch_phys_wc_index(r_list->map->mtrr); 206 207 mutex_unlock(&dev->struct_mutex); 208 209 return 0; 210 } 211 212 /* 213 * Get client information. 214 * 215 * \param inode device inode. 216 * \param file_priv DRM file private. 217 * \param cmd command. 218 * \param arg user argument, pointing to a drm_client structure. 219 * 220 * \return zero on success or a negative number on failure. 221 * 222 * Searches for the client with the specified index and copies its information 223 * into userspace 224 */ 225 static int drm_getclient(struct drm_device *dev, void *data, 226 struct drm_file *file_priv) 227 { 228 struct drm_client *client = data; 229 230 /* 231 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 232 * not breaking completely. Userspace tools stop enumerating one they 233 * get -EINVAL, hence this is the return value we need to hand back for 234 * no clients tracked. 235 * 236 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 237 * attempt to figure out whether they're authenticated or not. Since 238 * that's the only thing they care about, give it to the directly 239 * instead of walking one giant list. 240 */ 241 if (client->idx == 0) { 242 client->auth = file_priv->authenticated; 243 #ifdef __NetBSD__ /* XXX Too scary to contemplate. */ 244 client->pid = curproc->p_pid; 245 client->uid = kauth_cred_geteuid(curproc->p_cred); 246 #else 247 client->pid = pid_vnr(file_priv->pid); 248 client->uid = from_kuid_munged(current_user_ns(), 249 file_priv->uid); 250 #endif 251 client->magic = 0; 252 client->iocs = 0; 253 254 return 0; 255 } else { 256 return -EINVAL; 257 } 258 } 259 260 /* 261 * Get statistics information. 262 * 263 * \param inode device inode. 264 * \param file_priv DRM file private. 265 * \param cmd command. 266 * \param arg user argument, pointing to a drm_stats structure. 267 * 268 * \return zero on success or a negative number on failure. 269 */ 270 static int drm_getstats(struct drm_device *dev, void *data, 271 struct drm_file *file_priv) 272 { 273 struct drm_stats *stats = data; 274 275 /* Clear stats to prevent userspace from eating its stack garbage. */ 276 memset(stats, 0, sizeof(*stats)); 277 278 return 0; 279 } 280 281 /* 282 * Get device/driver capabilities 283 */ 284 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 285 { 286 struct drm_get_cap *req = data; 287 288 req->value = 0; 289 switch (req->capability) { 290 case DRM_CAP_DUMB_BUFFER: 291 if (dev->driver->dumb_create) 292 req->value = 1; 293 break; 294 case DRM_CAP_VBLANK_HIGH_CRTC: 295 req->value = 1; 296 break; 297 case DRM_CAP_DUMB_PREFERRED_DEPTH: 298 req->value = dev->mode_config.preferred_depth; 299 break; 300 case DRM_CAP_DUMB_PREFER_SHADOW: 301 req->value = dev->mode_config.prefer_shadow; 302 break; 303 case DRM_CAP_PRIME: 304 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 305 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 306 break; 307 case DRM_CAP_TIMESTAMP_MONOTONIC: 308 req->value = drm_timestamp_monotonic; 309 break; 310 case DRM_CAP_ASYNC_PAGE_FLIP: 311 req->value = dev->mode_config.async_page_flip; 312 break; 313 case DRM_CAP_CURSOR_WIDTH: 314 if (dev->mode_config.cursor_width) 315 req->value = dev->mode_config.cursor_width; 316 else 317 req->value = 64; 318 break; 319 case DRM_CAP_CURSOR_HEIGHT: 320 if (dev->mode_config.cursor_height) 321 req->value = dev->mode_config.cursor_height; 322 else 323 req->value = 64; 324 break; 325 case DRM_CAP_ADDFB2_MODIFIERS: 326 req->value = dev->mode_config.allow_fb_modifiers; 327 break; 328 default: 329 return -EINVAL; 330 } 331 return 0; 332 } 333 334 /* 335 * Set device/driver capabilities 336 */ 337 static int 338 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 339 { 340 struct drm_set_client_cap *req = data; 341 342 switch (req->capability) { 343 case DRM_CLIENT_CAP_STEREO_3D: 344 if (req->value > 1) 345 return -EINVAL; 346 file_priv->stereo_allowed = req->value; 347 break; 348 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 349 if (req->value > 1) 350 return -EINVAL; 351 file_priv->universal_planes = req->value; 352 break; 353 case DRM_CLIENT_CAP_ATOMIC: 354 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 355 return -EINVAL; 356 if (req->value > 1) 357 return -EINVAL; 358 file_priv->atomic = req->value; 359 file_priv->universal_planes = req->value; 360 break; 361 default: 362 return -EINVAL; 363 } 364 365 return 0; 366 } 367 368 /* 369 * Setversion ioctl. 370 * 371 * \param inode device inode. 372 * \param file_priv DRM file private. 373 * \param cmd command. 374 * \param arg user argument, pointing to a drm_lock structure. 375 * \return zero on success or negative number on failure. 376 * 377 * Sets the requested interface version 378 */ 379 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 380 { 381 struct drm_set_version *sv = data; 382 int if_version, retcode = 0; 383 384 if (sv->drm_di_major != -1) { 385 if (sv->drm_di_major != DRM_IF_MAJOR || 386 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 387 retcode = -EINVAL; 388 goto done; 389 } 390 if_version = DRM_IF_VERSION(sv->drm_di_major, 391 sv->drm_di_minor); 392 dev->if_version = max(if_version, dev->if_version); 393 if (sv->drm_di_minor >= 1) { 394 /* 395 * Version 1.1 includes tying of DRM to specific device 396 * Version 1.4 has proper PCI domain support 397 */ 398 retcode = drm_set_busid(dev, file_priv); 399 if (retcode) 400 goto done; 401 } 402 } 403 404 if (sv->drm_dd_major != -1) { 405 if (sv->drm_dd_major != dev->driver->major || 406 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 407 dev->driver->minor) { 408 retcode = -EINVAL; 409 goto done; 410 } 411 } 412 413 done: 414 sv->drm_di_major = DRM_IF_MAJOR; 415 sv->drm_di_minor = DRM_IF_MINOR; 416 sv->drm_dd_major = dev->driver->major; 417 sv->drm_dd_minor = dev->driver->minor; 418 419 return retcode; 420 } 421 422 /** 423 * drm_noop - DRM no-op ioctl implemntation 424 * @dev: DRM device for the ioctl 425 * @data: data pointer for the ioctl 426 * @file_priv: DRM file for the ioctl call 427 * 428 * This no-op implementation for drm ioctls is useful for deprecated 429 * functionality where we can't return a failure code because existing userspace 430 * checks the result of the ioctl, but doesn't care about the action. 431 * 432 * Always returns successfully with 0. 433 */ 434 int drm_noop(struct drm_device *dev, void *data, 435 struct drm_file *file_priv) 436 { 437 DRM_DEBUG("\n"); 438 return 0; 439 } 440 EXPORT_SYMBOL(drm_noop); 441 442 /** 443 * drm_invalid_op - DRM invalid ioctl implemntation 444 * @dev: DRM device for the ioctl 445 * @data: data pointer for the ioctl 446 * @file_priv: DRM file for the ioctl call 447 * 448 * This no-op implementation for drm ioctls is useful for deprecated 449 * functionality where we really don't want to allow userspace to call the ioctl 450 * any more. This is the case for old ums interfaces for drivers that 451 * transitioned to kms gradually and so kept the old legacy tables around. This 452 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 453 * use this function. 454 * 455 * Always fails with a return value of -EINVAL. 456 */ 457 int drm_invalid_op(struct drm_device *dev, void *data, 458 struct drm_file *file_priv) 459 { 460 return -EINVAL; 461 } 462 EXPORT_SYMBOL(drm_invalid_op); 463 464 /* 465 * Copy and IOCTL return string to user space 466 */ 467 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 468 { 469 int len; 470 471 /* don't overflow userbuf */ 472 len = strlen(value); 473 if (len > *buf_len) 474 len = *buf_len; 475 476 /* let userspace know exact length of driver value (which could be 477 * larger than the userspace-supplied buffer) */ 478 *buf_len = strlen(value); 479 480 /* finally, try filling in the userbuf */ 481 if (len && buf) 482 if (copy_to_user(buf, value, len)) 483 return -EFAULT; 484 return 0; 485 } 486 487 /* 488 * Get version information 489 * 490 * \param inode device inode. 491 * \param filp file pointer. 492 * \param cmd command. 493 * \param arg user argument, pointing to a drm_version structure. 494 * \return zero on success or negative number on failure. 495 * 496 * Fills in the version information in \p arg. 497 */ 498 static int drm_version(struct drm_device *dev, void *data, 499 struct drm_file *file_priv) 500 { 501 struct drm_version *version = data; 502 int err; 503 504 version->version_major = dev->driver->major; 505 version->version_minor = dev->driver->minor; 506 version->version_patchlevel = dev->driver->patchlevel; 507 err = drm_copy_field(version->name, &version->name_len, 508 dev->driver->name); 509 if (!err) 510 err = drm_copy_field(version->date, &version->date_len, 511 dev->driver->date); 512 if (!err) 513 err = drm_copy_field(version->desc, &version->desc_len, 514 dev->driver->desc); 515 516 return err; 517 } 518 519 /* 520 * drm_ioctl_permit - Check ioctl permissions against caller 521 * 522 * @flags: ioctl permission flags. 523 * @file_priv: Pointer to struct drm_file identifying the caller. 524 * 525 * Checks whether the caller is allowed to run an ioctl with the 526 * indicated permissions. If so, returns zero. Otherwise returns an 527 * error code suitable for ioctl return. 528 */ 529 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 530 { 531 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 532 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 533 return -EACCES; 534 535 /* AUTH is only for authenticated or render client */ 536 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 537 !file_priv->authenticated)) 538 return -EACCES; 539 540 /* MASTER is only for master or control clients */ 541 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && 542 !drm_is_control_client(file_priv))) 543 return -EACCES; 544 545 /* Control clients must be explicitly allowed */ 546 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 547 drm_is_control_client(file_priv))) 548 return -EACCES; 549 550 /* Render clients must be explicitly allowed */ 551 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 552 drm_is_render_client(file_priv))) 553 return -EACCES; 554 555 return 0; 556 } 557 EXPORT_SYMBOL(drm_ioctl_permit); 558 559 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 560 [DRM_IOCTL_NR(ioctl)] = { \ 561 .cmd = ioctl, \ 562 .func = _func, \ 563 .flags = _flags, \ 564 .name = #ioctl \ 565 } 566 567 /* Ioctl table */ 568 static const struct drm_ioctl_desc drm_ioctls[] = { 569 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 570 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW), 571 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 572 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 573 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 574 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED), 575 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 576 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 577 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 578 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 579 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 580 581 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 582 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 583 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 584 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 585 586 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 587 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 588 589 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 590 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 591 592 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 593 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 594 595 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 596 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 597 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 598 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 599 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 600 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 601 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 602 603 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 604 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 605 606 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 607 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 608 609 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 610 611 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 612 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 613 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 614 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 615 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 616 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 617 618 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 619 620 #if IS_ENABLED(CONFIG_AGP) 621 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 622 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 623 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 624 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 625 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 626 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 627 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 628 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 629 #endif 630 631 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 632 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 633 634 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 635 636 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 637 638 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 639 640 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 641 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 642 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 643 644 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 645 646 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 647 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 648 649 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 650 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 651 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 652 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 653 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 654 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 655 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 656 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 657 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 658 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 659 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 660 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 661 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 662 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 663 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 664 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 665 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 666 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 667 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 668 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 669 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 670 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 671 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 672 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 673 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 674 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 675 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 676 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 677 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 678 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 679 }; 680 681 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 682 683 /** 684 * drm_ioctl - ioctl callback implementation for DRM drivers 685 * @filp: file this ioctl is called on 686 * @cmd: ioctl cmd number 687 * @arg: user argument 688 * 689 * Looks up the ioctl function in the ::ioctls table, checking for root 690 * previleges if so required, and dispatches to the respective function. 691 * 692 * Returns: 693 * Zero on success, negative error code on failure. 694 */ 695 #ifdef __NetBSD__ 696 #include <sys/file.h> 697 int 698 drm_ioctl(struct file *fp, unsigned long cmd, void *data) 699 { 700 char stackbuf[128]; 701 char *buf = stackbuf; 702 void *data0 = data; 703 struct drm_file *const file = fp->f_data; 704 const unsigned int nr = DRM_IOCTL_NR(cmd); 705 int error; 706 707 switch (cmd) { 708 case FIONBIO: 709 case FIOASYNC: 710 return 0; 711 default: 712 break; 713 } 714 715 if (IOCGROUP(cmd) != DRM_IOCTL_BASE) 716 return EINVAL; 717 718 KASSERT(file != NULL); 719 KASSERT(file->minor != NULL); 720 KASSERT(file->minor->dev != NULL); 721 struct drm_device *const dev = file->minor->dev; 722 const struct drm_ioctl_desc *ioctl; 723 724 if (drm_device_is_unplugged(dev)) 725 return ENXIO; 726 727 const bool is_driver_ioctl = 728 (DRM_COMMAND_BASE <= nr) && (nr < DRM_COMMAND_END); 729 730 if (is_driver_ioctl) { 731 const unsigned int driver_nr = nr - DRM_COMMAND_BASE; 732 if (driver_nr >= dev->driver->num_ioctls) 733 return EINVAL; 734 ioctl = &dev->driver->ioctls[driver_nr]; 735 } else if (nr < __arraycount(drm_ioctls)) { 736 ioctl = &drm_ioctls[nr]; 737 } else { 738 ioctl = NULL; 739 } 740 741 if ((ioctl == NULL) || (ioctl->func == NULL)) 742 return EINVAL; 743 744 /* XXX errno Linux->NetBSD */ 745 error = -drm_ioctl_permit(ioctl->flags, file); 746 if (error) 747 return error; 748 749 /* If userland passed in too few bytes, zero-pad them. */ 750 if (IOCPARM_LEN(cmd) < IOCPARM_LEN(ioctl->cmd)) { 751 /* 12-bit quantity, according to <sys/ioccom.h> */ 752 KASSERT(IOCPARM_LEN(ioctl->cmd) <= 4096); 753 if (IOCPARM_LEN(ioctl->cmd) > sizeof stackbuf) { 754 buf = kmem_alloc(IOCPARM_LEN(ioctl->cmd), KM_NOSLEEP); 755 if (buf == NULL) 756 return ENOMEM; 757 } 758 memcpy(buf, data, IOCPARM_LEN(cmd)); 759 memset(buf + IOCPARM_LEN(cmd), 0, 760 IOCPARM_LEN(ioctl->cmd) - IOCPARM_LEN(cmd)); 761 data0 = buf; 762 } 763 764 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || 765 ISSET(ioctl->flags, DRM_UNLOCKED)) { 766 /* XXX errno Linux->NetBSD */ 767 error = -(*ioctl->func)(dev, data0, file); 768 } else { 769 mutex_lock(&drm_global_mutex); 770 /* XXX errno Linux->NetBSD */ 771 error = -(*ioctl->func)(dev, data0, file); 772 mutex_unlock(&drm_global_mutex); 773 } 774 775 /* If we used a temporary buffer, copy it back out. */ 776 if (data != data0) 777 memcpy(data, data0, IOCPARM_LEN(cmd)); 778 779 /* If we had to allocate a heap buffer, free it. */ 780 if (buf != stackbuf) 781 kmem_free(buf, IOCPARM_LEN(ioctl->cmd)); 782 783 return error; 784 } 785 #else 786 long drm_ioctl(struct file *filp, 787 unsigned int cmd, unsigned long arg) 788 { 789 struct drm_file *file_priv = filp->private_data; 790 struct drm_device *dev; 791 const struct drm_ioctl_desc *ioctl = NULL; 792 drm_ioctl_t *func; 793 unsigned int nr = DRM_IOCTL_NR(cmd); 794 int retcode = -EINVAL; 795 char stack_kdata[128]; 796 char *kdata = NULL; 797 unsigned int usize, asize, drv_size; 798 bool is_driver_ioctl; 799 800 dev = file_priv->minor->dev; 801 802 if (drm_device_is_unplugged(dev)) 803 return -ENODEV; 804 805 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 806 807 if (is_driver_ioctl) { 808 /* driver ioctl */ 809 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) 810 goto err_i1; 811 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 812 } else { 813 /* core ioctl */ 814 if (nr >= DRM_CORE_IOCTL_COUNT) 815 goto err_i1; 816 ioctl = &drm_ioctls[nr]; 817 } 818 819 drv_size = _IOC_SIZE(ioctl->cmd); 820 usize = _IOC_SIZE(cmd); 821 asize = max(usize, drv_size); 822 cmd = ioctl->cmd; 823 824 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 825 task_pid_nr(current), 826 (long)old_encode_dev(file_priv->minor->kdev->devt), 827 file_priv->authenticated, ioctl->name); 828 829 /* Do not trust userspace, use our own definition */ 830 func = ioctl->func; 831 832 if (unlikely(!func)) { 833 DRM_DEBUG("no function\n"); 834 retcode = -EINVAL; 835 goto err_i1; 836 } 837 838 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 839 if (unlikely(retcode)) 840 goto err_i1; 841 842 if (cmd & (IOC_IN | IOC_OUT)) { 843 if (asize <= sizeof(stack_kdata)) { 844 kdata = stack_kdata; 845 } else { 846 kdata = kmalloc(asize, GFP_KERNEL); 847 if (!kdata) { 848 retcode = -ENOMEM; 849 goto err_i1; 850 } 851 } 852 if (asize > usize) 853 memset(kdata + usize, 0, asize - usize); 854 } 855 856 if (cmd & IOC_IN) { 857 if (copy_from_user(kdata, (void __user *)arg, 858 usize) != 0) { 859 retcode = -EFAULT; 860 goto err_i1; 861 } 862 } else if (cmd & IOC_OUT) { 863 memset(kdata, 0, usize); 864 } 865 866 /* Enforce sane locking for kms driver ioctls. Core ioctls are 867 * too messy still. */ 868 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || 869 (ioctl->flags & DRM_UNLOCKED)) 870 retcode = func(dev, kdata, file_priv); 871 else { 872 mutex_lock(&drm_global_mutex); 873 retcode = func(dev, kdata, file_priv); 874 mutex_unlock(&drm_global_mutex); 875 } 876 877 if (cmd & IOC_OUT) { 878 if (copy_to_user((void __user *)arg, kdata, 879 usize) != 0) 880 retcode = -EFAULT; 881 } 882 883 err_i1: 884 if (!ioctl) 885 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 886 task_pid_nr(current), 887 (long)old_encode_dev(file_priv->minor->kdev->devt), 888 file_priv->authenticated, cmd, nr); 889 890 if (kdata != stack_kdata) 891 kfree(kdata); 892 if (retcode) 893 DRM_DEBUG("ret = %d\n", retcode); 894 return retcode; 895 } 896 #endif 897 EXPORT_SYMBOL(drm_ioctl); 898 899 /** 900 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 901 * @nr: ioctl number 902 * @flags: where to return the ioctl permission flags 903 * 904 * This ioctl is only used by the vmwgfx driver to augment the access checks 905 * done by the drm core and insofar a pretty decent layering violation. This 906 * shouldn't be used by any drivers. 907 * 908 * Returns: 909 * True if the @nr corresponds to a DRM core ioctl numer, false otherwise. 910 */ 911 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 912 { 913 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 914 return false; 915 916 if (nr >= DRM_CORE_IOCTL_COUNT) 917 return false; 918 919 *flags = drm_ioctls[nr].flags; 920 return true; 921 } 922 EXPORT_SYMBOL(drm_ioctl_flags); 923
Indexes created Wed Oct 15 16:09:53 GMT 2025