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 36#include <linux/pci.h> 37#include <linux/export.h> 38#ifdef CONFIG_X86 39#include <asm/mtrr.h> 40#endif 41 42static int drm_version(struct drm_device *dev, void *data, 43 struct drm_file *file_priv); 44 45/** 46 * Get the bus id. 47 * 48 * \param inode device inode. 49 * \param file_priv DRM file private. 50 * \param cmd command. 51 * \param arg user argument, pointing to a drm_unique structure. 52 * \return zero on success or a negative number on failure. 53 * 54 * Copies the bus id from drm_device::unique into user space. 55 */ 56static int drm_getunique(struct drm_device *dev, void *data, 57 struct drm_file *file_priv) 58{ 59 struct drm_unique *u = data; 60 struct drm_master *master = file_priv->master; 61 62 if (u->unique_len >= master->unique_len) { 63 if (copy_to_user(u->unique, master->unique, master->unique_len)) 64 return -EFAULT; 65 } 66 u->unique_len = master->unique_len; 67 68 return 0; 69} 70 71static void 72drm_unset_busid(struct drm_device *dev, 73 struct drm_master *master) 74{ 75 kfree(master->unique); 76 master->unique = NULL; 77 master->unique_len = 0; 78} 79 80/** 81 * Set the bus id. 82 * 83 * \param inode device inode. 84 * \param file_priv DRM file private. 85 * \param cmd command. 86 * \param arg user argument, pointing to a drm_unique structure. 87 * \return zero on success or a negative number on failure. 88 * 89 * Copies the bus id from userspace into drm_device::unique, and verifies that 90 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 91 * in interface version 1.1 and will return EBUSY when setversion has requested 92 * version 1.1 or greater. Also note that KMS is all version 1.1 and later and 93 * UMS was only ever supported on pci devices. 94 */ 95static int drm_setunique(struct drm_device *dev, void *data, 96 struct drm_file *file_priv) 97{ 98 struct drm_unique *u = data; 99 struct drm_master *master = file_priv->master; 100 int ret; 101 102 if (master->unique_len || master->unique) 103 return -EBUSY; 104 105 if (!u->unique_len || u->unique_len > 1024) 106 return -EINVAL; 107 108 if (drm_core_check_feature(dev, DRIVER_MODESET)) 109 return 0; 110 111 if (WARN_ON(!dev->pdev)) 112 return -EINVAL; 113 114 ret = drm_pci_set_unique(dev, master, u); 115 if (ret) 116 goto err; 117 118 return 0; 119 120err: 121 drm_unset_busid(dev, master); 122 return ret; 123} 124 125static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 126{ 127 struct drm_master *master = file_priv->master; 128 int ret; 129 130 if (master->unique != NULL) 131 drm_unset_busid(dev, master); 132 133 if (dev->driver->set_busid) { 134 ret = dev->driver->set_busid(dev, master); 135 if (ret) { 136 drm_unset_busid(dev, master); 137 return ret; 138 } 139 } else { 140 if (WARN(dev->unique == NULL, 141 "No drm_driver.set_busid() implementation provided by " 142 "%ps. Use drm_dev_set_unique() to set the unique " 143 "name explicitly.", dev->driver)) 144 return -EINVAL; 145 146 master->unique = kstrdup(dev->unique, GFP_KERNEL); 147 if (master->unique) 148 master->unique_len = strlen(dev->unique); 149 } 150 151 return 0; 152} 153 154/** 155 * Get a mapping information. 156 * 157 * \param inode device inode. 158 * \param file_priv DRM file private. 159 * \param cmd command. 160 * \param arg user argument, pointing to a drm_map structure. 161 * 162 * \return zero on success or a negative number on failure. 163 * 164 * Searches for the mapping with the specified offset and copies its information 165 * into userspace 166 */ 167static int drm_getmap(struct drm_device *dev, void *data, 168 struct drm_file *file_priv) 169{ 170 struct drm_map *map = data; 171 struct drm_map_list *r_list = NULL; 172 struct list_head *list; 173 int idx; 174 int i; 175 176 idx = map->offset; 177 if (idx < 0) 178 return -EINVAL; 179 180 i = 0; 181 mutex_lock(&dev->struct_mutex); 182 list_for_each(list, &dev->maplist) { 183 if (i == idx) { 184 r_list = list_entry(list, struct drm_map_list, head); 185 break; 186 } 187 i++; 188 } 189 if (!r_list || !r_list->map) { 190 mutex_unlock(&dev->struct_mutex); 191 return -EINVAL; 192 } 193 194 map->offset = r_list->map->offset; 195 map->size = r_list->map->size; 196 map->type = r_list->map->type; 197 map->flags = r_list->map->flags; 198 map->handle = (void *)(unsigned long) r_list->user_token; 199 200#ifdef CONFIG_X86 201 /* 202 * There appears to be exactly one user of the mtrr index: dritest. 203 * It's easy enough to keep it working on non-PAT systems. 204 */ 205 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr); 206#else 207 map->mtrr = -1; 208#endif 209 210 mutex_unlock(&dev->struct_mutex); 211 212 return 0; 213} 214 215/** 216 * Get client information. 217 * 218 * \param inode device inode. 219 * \param file_priv DRM file private. 220 * \param cmd command. 221 * \param arg user argument, pointing to a drm_client structure. 222 * 223 * \return zero on success or a negative number on failure. 224 * 225 * Searches for the client with the specified index and copies its information 226 * into userspace 227 */ 228static int drm_getclient(struct drm_device *dev, void *data, 229 struct drm_file *file_priv) 230{ 231 struct drm_client *client = data; 232 233 /* 234 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 235 * not breaking completely. Userspace tools stop enumerating one they 236 * get -EINVAL, hence this is the return value we need to hand back for 237 * no clients tracked. 238 * 239 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 240 * attempt to figure out whether they're authenticated or not. Since 241 * that's the only thing they care about, give it to the directly 242 * instead of walking one giant list. 243 */ 244 if (client->idx == 0) { 245 client->auth = file_priv->authenticated; 246 client->pid = pid_vnr(file_priv->pid); 247 client->uid = from_kuid_munged(current_user_ns(), 248 file_priv->uid); 249 client->magic = 0; 250 client->iocs = 0; 251 252 return 0; 253 } else { 254 return -EINVAL; 255 } 256} 257 258/** 259 * Get statistics information. 260 * 261 * \param inode device inode. 262 * \param file_priv DRM file private. 263 * \param cmd command. 264 * \param arg user argument, pointing to a drm_stats structure. 265 * 266 * \return zero on success or a negative number on failure. 267 */ 268static int drm_getstats(struct drm_device *dev, void *data, 269 struct drm_file *file_priv) 270{ 271 struct drm_stats *stats = data; 272 273 /* Clear stats to prevent userspace from eating its stack garbage. */ 274 memset(stats, 0, sizeof(*stats)); 275 276 return 0; 277} 278 279/** 280 * Get device/driver capabilities 281 */ 282static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 283{ 284 struct drm_get_cap *req = data; 285 286 req->value = 0; 287 switch (req->capability) { 288 case DRM_CAP_DUMB_BUFFER: 289 if (dev->driver->dumb_create) 290 req->value = 1; 291 break; 292 case DRM_CAP_VBLANK_HIGH_CRTC: 293 req->value = 1; 294 break; 295 case DRM_CAP_DUMB_PREFERRED_DEPTH: 296 req->value = dev->mode_config.preferred_depth; 297 break; 298 case DRM_CAP_DUMB_PREFER_SHADOW: 299 req->value = dev->mode_config.prefer_shadow; 300 break; 301 case DRM_CAP_PRIME: 302 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 303 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 304 break; 305 case DRM_CAP_TIMESTAMP_MONOTONIC: 306 req->value = drm_timestamp_monotonic; 307 break; 308 case DRM_CAP_ASYNC_PAGE_FLIP: 309 req->value = dev->mode_config.async_page_flip; 310 break; 311 case DRM_CAP_CURSOR_WIDTH: 312 if (dev->mode_config.cursor_width) 313 req->value = dev->mode_config.cursor_width; 314 else 315 req->value = 64; 316 break; 317 case DRM_CAP_CURSOR_HEIGHT: 318 if (dev->mode_config.cursor_height) 319 req->value = dev->mode_config.cursor_height; 320 else 321 req->value = 64; 322 break; 323 default: 324 return -EINVAL; 325 } 326 return 0; 327} 328 329/** 330 * Set device/driver capabilities 331 */ 332static int 333drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 334{ 335 struct drm_set_client_cap *req = data; 336 337 switch (req->capability) { 338 case DRM_CLIENT_CAP_STEREO_3D: 339 if (req->value > 1) 340 return -EINVAL; 341 file_priv->stereo_allowed = req->value; 342 break; 343 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 344 if (req->value > 1) 345 return -EINVAL; 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 */ 366static 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 400done: 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/** No-op ioctl. */ 410int drm_noop(struct drm_device *dev, void *data, 411 struct drm_file *file_priv) 412{ 413 DRM_DEBUG("\n"); 414 return 0; 415} 416EXPORT_SYMBOL(drm_noop); 417 418/** 419 * Copy and IOCTL return string to user space 420 */ 421static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 422{ 423 int len; 424 425 /* don't overflow userbuf */ 426 len = strlen(value); 427 if (len > *buf_len) 428 len = *buf_len; 429 430 /* let userspace know exact length of driver value (which could be 431 * larger than the userspace-supplied buffer) */ 432 *buf_len = strlen(value); 433 434 /* finally, try filling in the userbuf */ 435 if (len && buf) 436 if (copy_to_user(buf, value, len)) 437 return -EFAULT; 438 return 0; 439} 440 441/** 442 * Get version information 443 * 444 * \param inode device inode. 445 * \param filp file pointer. 446 * \param cmd command. 447 * \param arg user argument, pointing to a drm_version structure. 448 * \return zero on success or negative number on failure. 449 * 450 * Fills in the version information in \p arg. 451 */ 452static int drm_version(struct drm_device *dev, void *data, 453 struct drm_file *file_priv) 454{ 455 struct drm_version *version = data; 456 int err; 457 458 version->version_major = dev->driver->major; 459 version->version_minor = dev->driver->minor; 460 version->version_patchlevel = dev->driver->patchlevel; 461 err = drm_copy_field(version->name, &version->name_len, 462 dev->driver->name); 463 if (!err) 464 err = drm_copy_field(version->date, &version->date_len, 465 dev->driver->date); 466 if (!err) 467 err = drm_copy_field(version->desc, &version->desc_len, 468 dev->driver->desc); 469 470 return err; 471} 472 473/** 474 * drm_ioctl_permit - Check ioctl permissions against caller 475 * 476 * @flags: ioctl permission flags. 477 * @file_priv: Pointer to struct drm_file identifying the caller. 478 * 479 * Checks whether the caller is allowed to run an ioctl with the 480 * indicated permissions. If so, returns zero. Otherwise returns an 481 * error code suitable for ioctl return. 482 */ 483static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 484{ 485 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 486 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 487 return -EACCES; 488 489 /* AUTH is only for authenticated or render client */ 490 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 491 !file_priv->authenticated)) 492 return -EACCES; 493 494 /* MASTER is only for master or control clients */ 495 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && 496 !drm_is_control_client(file_priv))) 497 return -EACCES; 498 499 /* Control clients must be explicitly allowed */ 500 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 501 drm_is_control_client(file_priv))) 502 return -EACCES; 503 504 /* Render clients must be explicitly allowed */ 505 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 506 drm_is_render_client(file_priv))) 507 return -EACCES; 508 509 return 0; 510} 511 512#define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 513 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl} 514 515/** Ioctl table */ 516static const struct drm_ioctl_desc drm_ioctls[] = { 517 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW), 518 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 519 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 520 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 521 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED), 522 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 523 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 524 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 525 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 526 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 527 528 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 529 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 530 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 531 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 532 533 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 534 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 535 536 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 537 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 538 539 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 540 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 541 542 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 543 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 544 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 545 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 546 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 547 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 548 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 549 550 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 551 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 552 553 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 554 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 555 556 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 557 558 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 559 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 560 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 561 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 562 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 563 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 564 565 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 566 567#if __OS_HAS_AGP 568 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 569 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 570 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 571 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 572 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 573 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 574 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 575 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 576#endif 577 578 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 579 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 580 581 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 582 583 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 584 585 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 586 587 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 588 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 589 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 590 591 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 592 593 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 594 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 595 596 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 597 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 598 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 599 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 600 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 601 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 602 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 603 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 604 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 605 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 606 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 607 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 608 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 609 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 610 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 611 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 612 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 613 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 614 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 615 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 623}; 624 625#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 626 627/** 628 * Called whenever a process performs an ioctl on /dev/drm. 629 * 630 * \param inode device inode. 631 * \param file_priv DRM file private. 632 * \param cmd command. 633 * \param arg user argument. 634 * \return zero on success or negative number on failure. 635 * 636 * Looks up the ioctl function in the ::ioctls table, checking for root 637 * previleges if so required, and dispatches to the respective function. 638 */ 639long drm_ioctl(struct file *filp, 640 unsigned int cmd, unsigned long arg) 641{ 642 struct drm_file *file_priv = filp->private_data; 643 struct drm_device *dev; 644 const struct drm_ioctl_desc *ioctl = NULL; 645 drm_ioctl_t *func; 646 unsigned int nr = DRM_IOCTL_NR(cmd); 647 int retcode = -EINVAL; 648 char stack_kdata[128]; 649 char *kdata = NULL; 650 unsigned int usize, asize; 651 652 dev = file_priv->minor->dev; 653 654 if (drm_device_is_unplugged(dev)) 655 return -ENODEV; 656 657 if ((nr >= DRM_CORE_IOCTL_COUNT) && 658 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 659 goto err_i1; 660 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 661 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 662 u32 drv_size; 663 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 664 drv_size = _IOC_SIZE(ioctl->cmd_drv); 665 usize = asize = _IOC_SIZE(cmd); 666 if (drv_size > asize) 667 asize = drv_size; 668 cmd = ioctl->cmd_drv; 669 } 670 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 671 u32 drv_size; 672 673 ioctl = &drm_ioctls[nr]; 674 675 drv_size = _IOC_SIZE(ioctl->cmd); 676 usize = asize = _IOC_SIZE(cmd); 677 if (drv_size > asize) 678 asize = drv_size; 679 680 cmd = ioctl->cmd; 681 } else 682 goto err_i1; 683 684 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 685 task_pid_nr(current), 686 (long)old_encode_dev(file_priv->minor->kdev->devt), 687 file_priv->authenticated, ioctl->name); 688 689 /* Do not trust userspace, use our own definition */ 690 func = ioctl->func; 691 692 if (unlikely(!func)) { 693 DRM_DEBUG("no function\n"); 694 retcode = -EINVAL; 695 goto err_i1; 696 } 697 698 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 699 if (unlikely(retcode)) 700 goto err_i1; 701 702 if (cmd & (IOC_IN | IOC_OUT)) { 703 if (asize <= sizeof(stack_kdata)) { 704 kdata = stack_kdata; 705 } else { 706 kdata = kmalloc(asize, GFP_KERNEL); 707 if (!kdata) { 708 retcode = -ENOMEM; 709 goto err_i1; 710 } 711 } 712 if (asize > usize) 713 memset(kdata + usize, 0, asize - usize); 714 } 715 716 if (cmd & IOC_IN) { 717 if (copy_from_user(kdata, (void __user *)arg, 718 usize) != 0) { 719 retcode = -EFAULT; 720 goto err_i1; 721 } 722 } else if (cmd & IOC_OUT) { 723 memset(kdata, 0, usize); 724 } 725 726 if (ioctl->flags & DRM_UNLOCKED) 727 retcode = func(dev, kdata, file_priv); 728 else { 729 mutex_lock(&drm_global_mutex); 730 retcode = func(dev, kdata, file_priv); 731 mutex_unlock(&drm_global_mutex); 732 } 733 734 if (cmd & IOC_OUT) { 735 if (copy_to_user((void __user *)arg, kdata, 736 usize) != 0) 737 retcode = -EFAULT; 738 } 739 740 err_i1: 741 if (!ioctl) 742 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 743 task_pid_nr(current), 744 (long)old_encode_dev(file_priv->minor->kdev->devt), 745 file_priv->authenticated, cmd, nr); 746 747 if (kdata != stack_kdata) 748 kfree(kdata); 749 if (retcode) 750 DRM_DEBUG("ret = %d\n", retcode); 751 return retcode; 752} 753EXPORT_SYMBOL(drm_ioctl); 754 755/** 756 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 757 * 758 * @nr: Ioctl number. 759 * @flags: Where to return the ioctl permission flags 760 */ 761bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 762{ 763 if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) || 764 (nr < DRM_COMMAND_BASE)) { 765 *flags = drm_ioctls[nr].flags; 766 return true; 767 } 768 769 return false; 770} 771EXPORT_SYMBOL(drm_ioctl_flags); 772