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_auth.h> 33 #include "drm_legacy.h" 34 #include "drm_internal.h" 35 #include "drm_crtc_internal.h" 36 37 #include <linux/pci.h> 38 #include <linux/export.h> 39 40 /** 41 * DOC: getunique and setversion story 42 * 43 * BEWARE THE DRAGONS! MIND THE TRAPDOORS! 44 * 45 * In an attempt to warn anyone else who's trying to figure out what's going 46 * on here, I'll try to summarize the story. First things first, let's clear up 47 * the names, because the kernel internals, libdrm and the ioctls are all named 48 * differently: 49 * 50 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm 51 * through the drmGetBusid function. 52 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All 53 * that code is nerved in the kernel with drm_invalid_op(). 54 * - The internal set_busid kernel functions and driver callbacks are 55 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is 56 * nerved) allowed userspace to set the busid through the above ioctl. 57 * - Other ioctls and functions involved are named consistently. 58 * 59 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly 60 * handling pci domains in the busid on ppc. Doing this correctly was only 61 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's 62 * special with drm 1.2 and 1.3. 63 * 64 * Now the actual horror story of how device lookup in drm works. At large, 65 * there's 2 different ways, either by busid, or by device driver name. 66 * 67 * Opening by busid is fairly simple: 68 * 69 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a 70 * side-effect this fills out the unique name in the master structure. 71 * 2. Call GET_UNIQUE to read out the unique name from the master structure, 72 * which matches the busid thanks to step 1. If it doesn't, proceed to try 73 * the next device node. 74 * 75 * Opening by name is slightly different: 76 * 77 * 1. Directly call VERSION to get the version and to match against the driver 78 * name returned by that ioctl. Note that SET_VERSION is not called, which 79 * means the the unique name for the master node just opening is _not_ filled 80 * out. This despite that with current drm device nodes are always bound to 81 * one device, and can't be runtime assigned like with drm 1.0. 82 * 2. Match driver name. If it mismatches, proceed to the next device node. 83 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by 84 * checking that the first byte in the string is 0). If that's not the case 85 * libdrm skips and proceeds to the next device node. Probably this is just 86 * copypasta from drm 1.0 times where a set unique name meant that the driver 87 * was in use already, but that's just conjecture. 88 * 89 * Long story short: To keep the open by name logic working, GET_UNIQUE must 90 * _not_ return a unique string when SET_VERSION hasn't been called yet, 91 * otherwise libdrm breaks. Even when that unique string can't ever change, and 92 * is totally irrelevant for actually opening the device because runtime 93 * assignable device instances were only support in drm 1.0, which is long dead. 94 * But the libdrm code in drmOpenByName somehow survived, hence this can't be 95 * broken. 96 */ 97 98 static int drm_version(struct drm_device *dev, void *data, 99 struct drm_file *file_priv); 100 101 /* 102 * Get the bus id. 103 * 104 * \param inode device inode. 105 * \param file_priv DRM file private. 106 * \param cmd command. 107 * \param arg user argument, pointing to a drm_unique structure. 108 * \return zero on success or a negative number on failure. 109 * 110 * Copies the bus id from drm_device::unique into user space. 111 */ 112 static int drm_getunique(struct drm_device *dev, void *data, 113 struct drm_file *file_priv) 114 { 115 struct drm_unique *u = data; 116 struct drm_master *master = file_priv->master; 117 118 mutex_lock(&master->dev->master_mutex); 119 if (u->unique_len >= master->unique_len) { 120 if (copy_to_user(u->unique, master->unique, master->unique_len)) { 121 mutex_unlock(&master->dev->master_mutex); 122 return -EFAULT; 123 } 124 } 125 u->unique_len = master->unique_len; 126 mutex_unlock(&master->dev->master_mutex); 127 128 return 0; 129 } 130 131 static void 132 drm_unset_busid(struct drm_device *dev, 133 struct drm_master *master) 134 { 135 kfree(master->unique); 136 master->unique = NULL; 137 master->unique_len = 0; 138 } 139 140 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 141 { 142 struct drm_master *master = file_priv->master; 143 int ret; 144 145 if (master->unique != NULL) 146 drm_unset_busid(dev, master); 147 148 if (dev->driver->set_busid) { 149 ret = dev->driver->set_busid(dev, master); 150 if (ret) { 151 drm_unset_busid(dev, master); 152 return ret; 153 } 154 } else { 155 WARN_ON(!dev->unique); 156 master->unique = kstrdup(dev->unique, GFP_KERNEL); 157 if (master->unique) 158 master->unique_len = strlen(dev->unique); 159 } 160 161 return 0; 162 } 163 164 /* 165 * Get client information. 166 * 167 * \param inode device inode. 168 * \param file_priv DRM file private. 169 * \param cmd command. 170 * \param arg user argument, pointing to a drm_client structure. 171 * 172 * \return zero on success or a negative number on failure. 173 * 174 * Searches for the client with the specified index and copies its information 175 * into userspace 176 */ 177 static int drm_getclient(struct drm_device *dev, void *data, 178 struct drm_file *file_priv) 179 { 180 struct drm_client *client = data; 181 182 /* 183 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 184 * not breaking completely. Userspace tools stop enumerating one they 185 * get -EINVAL, hence this is the return value we need to hand back for 186 * no clients tracked. 187 * 188 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 189 * attempt to figure out whether they're authenticated or not. Since 190 * that's the only thing they care about, give it to the directly 191 * instead of walking one giant list. 192 */ 193 if (client->idx == 0) { 194 client->auth = file_priv->authenticated; 195 client->pid = task_pid_vnr(current); 196 client->uid = overflowuid; 197 client->magic = 0; 198 client->iocs = 0; 199 200 return 0; 201 } else { 202 return -EINVAL; 203 } 204 } 205 206 /* 207 * Get statistics information. 208 * 209 * \param inode device inode. 210 * \param file_priv DRM file private. 211 * \param cmd command. 212 * \param arg user argument, pointing to a drm_stats structure. 213 * 214 * \return zero on success or a negative number on failure. 215 */ 216 static int drm_getstats(struct drm_device *dev, void *data, 217 struct drm_file *file_priv) 218 { 219 struct drm_stats *stats = data; 220 221 /* Clear stats to prevent userspace from eating its stack garbage. */ 222 memset(stats, 0, sizeof(*stats)); 223 224 return 0; 225 } 226 227 /* 228 * Get device/driver capabilities 229 */ 230 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 231 { 232 struct drm_get_cap *req = data; 233 struct drm_crtc *crtc; 234 235 req->value = 0; 236 237 /* Only some caps make sense with UMS/render-only drivers. */ 238 switch (req->capability) { 239 case DRM_CAP_TIMESTAMP_MONOTONIC: 240 req->value = drm_timestamp_monotonic; 241 return 0; 242 case DRM_CAP_PRIME: 243 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 244 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 245 return 0; 246 } 247 248 /* Other caps only work with KMS drivers */ 249 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 250 return -ENOTSUPP; 251 252 switch (req->capability) { 253 case DRM_CAP_DUMB_BUFFER: 254 if (dev->driver->dumb_create) 255 req->value = 1; 256 break; 257 case DRM_CAP_VBLANK_HIGH_CRTC: 258 req->value = 1; 259 break; 260 case DRM_CAP_DUMB_PREFERRED_DEPTH: 261 req->value = dev->mode_config.preferred_depth; 262 break; 263 case DRM_CAP_DUMB_PREFER_SHADOW: 264 req->value = dev->mode_config.prefer_shadow; 265 break; 266 case DRM_CAP_ASYNC_PAGE_FLIP: 267 req->value = dev->mode_config.async_page_flip; 268 break; 269 case DRM_CAP_PAGE_FLIP_TARGET: 270 req->value = 1; 271 drm_for_each_crtc(crtc, dev) { 272 if (!crtc->funcs->page_flip_target) 273 req->value = 0; 274 } 275 break; 276 case DRM_CAP_CURSOR_WIDTH: 277 if (dev->mode_config.cursor_width) 278 req->value = dev->mode_config.cursor_width; 279 else 280 req->value = 64; 281 break; 282 case DRM_CAP_CURSOR_HEIGHT: 283 if (dev->mode_config.cursor_height) 284 req->value = dev->mode_config.cursor_height; 285 else 286 req->value = 64; 287 break; 288 case DRM_CAP_ADDFB2_MODIFIERS: 289 req->value = dev->mode_config.allow_fb_modifiers; 290 break; 291 default: 292 return -EINVAL; 293 } 294 return 0; 295 } 296 297 /* 298 * Set device/driver capabilities 299 */ 300 static int 301 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 302 { 303 struct drm_set_client_cap *req = data; 304 305 switch (req->capability) { 306 case DRM_CLIENT_CAP_STEREO_3D: 307 if (req->value > 1) 308 return -EINVAL; 309 file_priv->stereo_allowed = req->value; 310 break; 311 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 312 if (req->value > 1) 313 return -EINVAL; 314 file_priv->universal_planes = req->value; 315 break; 316 case DRM_CLIENT_CAP_ATOMIC: 317 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 318 return -EINVAL; 319 if (req->value > 1) 320 return -EINVAL; 321 file_priv->atomic = req->value; 322 file_priv->universal_planes = req->value; 323 break; 324 default: 325 return -EINVAL; 326 } 327 328 return 0; 329 } 330 331 /* 332 * Setversion ioctl. 333 * 334 * \param inode device inode. 335 * \param file_priv DRM file private. 336 * \param cmd command. 337 * \param arg user argument, pointing to a drm_lock structure. 338 * \return zero on success or negative number on failure. 339 * 340 * Sets the requested interface version 341 */ 342 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 343 { 344 struct drm_set_version *sv = data; 345 int if_version, retcode = 0; 346 347 mutex_lock(&dev->master_mutex); 348 if (sv->drm_di_major != -1) { 349 if (sv->drm_di_major != DRM_IF_MAJOR || 350 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 351 retcode = -EINVAL; 352 goto done; 353 } 354 if_version = DRM_IF_VERSION(sv->drm_di_major, 355 sv->drm_di_minor); 356 dev->if_version = max(if_version, dev->if_version); 357 if (sv->drm_di_minor >= 1) { 358 /* 359 * Version 1.1 includes tying of DRM to specific device 360 * Version 1.4 has proper PCI domain support 361 */ 362 retcode = drm_set_busid(dev, file_priv); 363 if (retcode) 364 goto done; 365 } 366 } 367 368 if (sv->drm_dd_major != -1) { 369 if (sv->drm_dd_major != dev->driver->major || 370 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 371 dev->driver->minor) { 372 retcode = -EINVAL; 373 goto done; 374 } 375 } 376 377 done: 378 sv->drm_di_major = DRM_IF_MAJOR; 379 sv->drm_di_minor = DRM_IF_MINOR; 380 sv->drm_dd_major = dev->driver->major; 381 sv->drm_dd_minor = dev->driver->minor; 382 mutex_unlock(&dev->master_mutex); 383 384 return retcode; 385 } 386 387 /** 388 * drm_noop - DRM no-op ioctl implemntation 389 * @dev: DRM device for the ioctl 390 * @data: data pointer for the ioctl 391 * @file_priv: DRM file for the ioctl call 392 * 393 * This no-op implementation for drm ioctls is useful for deprecated 394 * functionality where we can't return a failure code because existing userspace 395 * checks the result of the ioctl, but doesn't care about the action. 396 * 397 * Always returns successfully with 0. 398 */ 399 int drm_noop(struct drm_device *dev, void *data, 400 struct drm_file *file_priv) 401 { 402 DRM_DEBUG("\n"); 403 return 0; 404 } 405 EXPORT_SYMBOL(drm_noop); 406 407 /** 408 * drm_invalid_op - DRM invalid ioctl implemntation 409 * @dev: DRM device for the ioctl 410 * @data: data pointer for the ioctl 411 * @file_priv: DRM file for the ioctl call 412 * 413 * This no-op implementation for drm ioctls is useful for deprecated 414 * functionality where we really don't want to allow userspace to call the ioctl 415 * any more. This is the case for old ums interfaces for drivers that 416 * transitioned to kms gradually and so kept the old legacy tables around. This 417 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 418 * use this function. 419 * 420 * Always fails with a return value of -EINVAL. 421 */ 422 int drm_invalid_op(struct drm_device *dev, void *data, 423 struct drm_file *file_priv) 424 { 425 return -EINVAL; 426 } 427 EXPORT_SYMBOL(drm_invalid_op); 428 429 /* 430 * Copy and IOCTL return string to user space 431 */ 432 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 433 { 434 int len; 435 436 /* don't overflow userbuf */ 437 len = strlen(value); 438 if (len > *buf_len) 439 len = *buf_len; 440 441 /* let userspace know exact length of driver value (which could be 442 * larger than the userspace-supplied buffer) */ 443 *buf_len = strlen(value); 444 445 /* finally, try filling in the userbuf */ 446 if (len && buf) 447 if (copy_to_user(buf, value, len)) 448 return -EFAULT; 449 return 0; 450 } 451 452 /* 453 * Get version information 454 * 455 * \param inode device inode. 456 * \param filp file pointer. 457 * \param cmd command. 458 * \param arg user argument, pointing to a drm_version structure. 459 * \return zero on success or negative number on failure. 460 * 461 * Fills in the version information in \p arg. 462 */ 463 static int drm_version(struct drm_device *dev, void *data, 464 struct drm_file *file_priv) 465 { 466 struct drm_version *version = data; 467 int err; 468 469 version->version_major = dev->driver->major; 470 version->version_minor = dev->driver->minor; 471 version->version_patchlevel = dev->driver->patchlevel; 472 err = drm_copy_field(version->name, &version->name_len, 473 dev->driver->name); 474 if (!err) 475 err = drm_copy_field(version->date, &version->date_len, 476 dev->driver->date); 477 if (!err) 478 err = drm_copy_field(version->desc, &version->desc_len, 479 dev->driver->desc); 480 481 return err; 482 } 483 484 /* 485 * drm_ioctl_permit - Check ioctl permissions against caller 486 * 487 * @flags: ioctl permission flags. 488 * @file_priv: Pointer to struct drm_file identifying the caller. 489 * 490 * Checks whether the caller is allowed to run an ioctl with the 491 * indicated permissions. If so, returns zero. Otherwise returns an 492 * error code suitable for ioctl return. 493 */ 494 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 495 { 496 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 497 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 498 return -EACCES; 499 500 /* AUTH is only for authenticated or render client */ 501 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 502 !file_priv->authenticated)) 503 return -EACCES; 504 505 /* MASTER is only for master or control clients */ 506 if (unlikely((flags & DRM_MASTER) && 507 !drm_is_current_master(file_priv) && 508 !drm_is_control_client(file_priv))) 509 return -EACCES; 510 511 /* Control clients must be explicitly allowed */ 512 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 513 drm_is_control_client(file_priv))) 514 return -EACCES; 515 516 /* Render clients must be explicitly allowed */ 517 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 518 drm_is_render_client(file_priv))) 519 return -EACCES; 520 521 return 0; 522 } 523 EXPORT_SYMBOL(drm_ioctl_permit); 524 525 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 526 [DRM_IOCTL_NR(ioctl)] = { \ 527 .cmd = ioctl, \ 528 .func = _func, \ 529 .flags = _flags, \ 530 .name = #ioctl \ 531 } 532 533 /* Ioctl table */ 534 static const struct drm_ioctl_desc drm_ioctls[] = { 535 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 536 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW), 537 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, DRM_UNLOCKED), 538 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED), 539 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 540 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED), 541 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 542 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 543 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 544 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, DRM_UNLOCKED), 545 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_UNLOCKED | DRM_MASTER), 546 547 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 548 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 549 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 550 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_UNLOCKED|DRM_MASTER), 551 552 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 553 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 554 555 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 556 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 557 558 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), 559 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), 560 561 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 562 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 563 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 564 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 565 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 566 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 567 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 568 569 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 570 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 571 572 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 573 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 574 575 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 576 577 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 578 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 579 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 580 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 581 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 582 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 583 584 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 585 586 #if IS_ENABLED(CONFIG_AGP) 587 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 588 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 589 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 590 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 591 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 592 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 593 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 594 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 595 #endif 596 597 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 598 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 599 600 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 601 602 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl, 0), 603 604 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 605 606 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 607 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 608 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 609 610 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 611 612 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 613 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 614 615 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 624 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 625 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 626 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 627 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 628 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 629 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 630 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 631 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 632 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 633 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 634 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 635 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 636 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 637 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 638 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 639 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 640 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 641 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 642 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 643 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 644 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 645 }; 646 647 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 648 649 /** 650 * drm_ioctl - ioctl callback implementation for DRM drivers 651 * @filp: file this ioctl is called on 652 * @cmd: ioctl cmd number 653 * @arg: user argument 654 * 655 * Looks up the ioctl function in the ::ioctls table, checking for root 656 * previleges if so required, and dispatches to the respective function. 657 * 658 * Returns: 659 * Zero on success, negative error code on failure. 660 */ 661 long drm_ioctl(struct file *filp, 662 unsigned int cmd, unsigned long arg) 663 { 664 struct drm_file *file_priv = filp->private_data; 665 struct drm_device *dev; 666 const struct drm_ioctl_desc *ioctl = NULL; 667 drm_ioctl_t *func; 668 unsigned int nr = DRM_IOCTL_NR(cmd); 669 int retcode = -EINVAL; 670 char stack_kdata[128]; 671 char *kdata = NULL; 672 unsigned int in_size, out_size, drv_size, ksize; 673 bool is_driver_ioctl; 674 675 dev = file_priv->minor->dev; 676 677 if (drm_device_is_unplugged(dev)) 678 return -ENODEV; 679 680 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 681 682 if (is_driver_ioctl) { 683 /* driver ioctl */ 684 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) 685 goto err_i1; 686 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 687 } else { 688 /* core ioctl */ 689 if (nr >= DRM_CORE_IOCTL_COUNT) 690 goto err_i1; 691 ioctl = &drm_ioctls[nr]; 692 } 693 694 drv_size = _IOC_SIZE(ioctl->cmd); 695 out_size = in_size = _IOC_SIZE(cmd); 696 if ((cmd & ioctl->cmd & IOC_IN) == 0) 697 in_size = 0; 698 if ((cmd & ioctl->cmd & IOC_OUT) == 0) 699 out_size = 0; 700 ksize = max(max(in_size, out_size), drv_size); 701 702 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 703 task_pid_nr(current), 704 (long)old_encode_dev(file_priv->minor->kdev->devt), 705 file_priv->authenticated, ioctl->name); 706 707 /* Do not trust userspace, use our own definition */ 708 func = ioctl->func; 709 710 if (unlikely(!func)) { 711 DRM_DEBUG("no function\n"); 712 retcode = -EINVAL; 713 goto err_i1; 714 } 715 716 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 717 if (unlikely(retcode)) 718 goto err_i1; 719 720 if (ksize <= sizeof(stack_kdata)) { 721 kdata = stack_kdata; 722 } else { 723 kdata = kmalloc(ksize, GFP_KERNEL); 724 if (!kdata) { 725 retcode = -ENOMEM; 726 goto err_i1; 727 } 728 } 729 730 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { 731 retcode = -EFAULT; 732 goto err_i1; 733 } 734 735 if (ksize > in_size) 736 memset(kdata + in_size, 0, ksize - in_size); 737 738 /* Enforce sane locking for modern driver ioctls. */ 739 if (!drm_core_check_feature(dev, DRIVER_LEGACY) || 740 (ioctl->flags & DRM_UNLOCKED)) 741 retcode = func(dev, kdata, file_priv); 742 else { 743 mutex_lock(&drm_global_mutex); 744 retcode = func(dev, kdata, file_priv); 745 mutex_unlock(&drm_global_mutex); 746 } 747 748 if (copy_to_user((void __user *)arg, kdata, out_size) != 0) 749 retcode = -EFAULT; 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 * @nr: ioctl number 769 * @flags: where to return the ioctl permission flags 770 * 771 * This ioctl is only used by the vmwgfx driver to augment the access checks 772 * done by the drm core and insofar a pretty decent layering violation. This 773 * shouldn't be used by any drivers. 774 * 775 * Returns: 776 * True if the @nr corresponds to a DRM core ioctl number, false otherwise. 777 */ 778 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 779 { 780 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 781 return false; 782 783 if (nr >= DRM_CORE_IOCTL_COUNT) 784 return false; 785 786 *flags = drm_ioctls[nr].flags; 787 return true; 788 } 789 EXPORT_SYMBOL(drm_ioctl_flags); 790