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; 116 117 if (u->unique_len >= dev->unique_len) { 118 if (copy_to_user(u->unique, dev->unique, dev->unique_len)) 119 return -EFAULT; 120 } 121 u->unique_len = dev->unique_len; 122 123 return 0; 124 } 125 126 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 127 { 128 129 DRM_LOCK(dev); 130 131 dev->unique_len = 20; 132 dev->unique = kmalloc(dev->unique_len + 1, M_DRM, M_WAITOK | M_NULLOK); 133 if (dev->unique == NULL) { 134 DRM_UNLOCK(dev); 135 return -ENOMEM; 136 } 137 138 ksnprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%1x", 139 dev->pci_domain, dev->pci_bus, dev->pci_slot, dev->pci_func); 140 141 DRM_UNLOCK(dev); 142 143 return 0; 144 } 145 146 /* 147 * Get client information. 148 * 149 * \param inode device inode. 150 * \param file_priv DRM file private. 151 * \param cmd command. 152 * \param arg user argument, pointing to a drm_client structure. 153 * 154 * \return zero on success or a negative number on failure. 155 * 156 * Searches for the client with the specified index and copies its information 157 * into userspace 158 */ 159 static int drm_getclient(struct drm_device *dev, void *data, 160 struct drm_file *file_priv) 161 { 162 struct drm_client *client = data; 163 164 /* 165 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 166 * not breaking completely. Userspace tools stop enumerating one they 167 * get -EINVAL, hence this is the return value we need to hand back for 168 * no clients tracked. 169 * 170 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 171 * attempt to figure out whether they're authenticated or not. Since 172 * that's the only thing they care about, give it to the directly 173 * instead of walking one giant list. 174 */ 175 if (client->idx == 0) { 176 client->auth = file_priv->authenticated; 177 client->pid = curproc->p_pid; 178 client->uid = -1; 179 client->magic = 0; 180 client->iocs = 0; 181 182 return 0; 183 } else { 184 return -EINVAL; 185 } 186 } 187 188 /* 189 * Get statistics information. 190 * 191 * \param inode device inode. 192 * \param file_priv DRM file private. 193 * \param cmd command. 194 * \param arg user argument, pointing to a drm_stats structure. 195 * 196 * \return zero on success or a negative number on failure. 197 */ 198 static int drm_getstats(struct drm_device *dev, void *data, 199 struct drm_file *file_priv) 200 { 201 struct drm_stats *stats = data; 202 203 /* Clear stats to prevent userspace from eating its stack garbage. */ 204 memset(stats, 0, sizeof(*stats)); 205 206 return 0; 207 } 208 209 /* 210 * Get device/driver capabilities 211 */ 212 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 213 { 214 struct drm_get_cap *req = data; 215 struct drm_crtc *crtc; 216 217 req->value = 0; 218 219 /* Only some caps make sense with UMS/render-only drivers. */ 220 switch (req->capability) { 221 case DRM_CAP_TIMESTAMP_MONOTONIC: 222 req->value = drm_timestamp_monotonic; 223 return 0; 224 case DRM_CAP_PRIME: 225 #ifdef __DragonFly__ 226 return -EINVAL; 227 #else 228 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 229 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 230 return 0; 231 #endif 232 } 233 234 /* Other caps only work with KMS drivers */ 235 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 236 return -ENOTSUPP; 237 238 switch (req->capability) { 239 case DRM_CAP_DUMB_BUFFER: 240 if (dev->driver->dumb_create) 241 req->value = 1; 242 break; 243 case DRM_CAP_VBLANK_HIGH_CRTC: 244 req->value = 1; 245 break; 246 case DRM_CAP_DUMB_PREFERRED_DEPTH: 247 req->value = dev->mode_config.preferred_depth; 248 break; 249 case DRM_CAP_DUMB_PREFER_SHADOW: 250 req->value = dev->mode_config.prefer_shadow; 251 break; 252 case DRM_CAP_ASYNC_PAGE_FLIP: 253 req->value = dev->mode_config.async_page_flip; 254 break; 255 case DRM_CAP_PAGE_FLIP_TARGET: 256 req->value = 1; 257 drm_for_each_crtc(crtc, dev) { 258 if (!crtc->funcs->page_flip_target) 259 req->value = 0; 260 } 261 break; 262 case DRM_CAP_CURSOR_WIDTH: 263 if (dev->mode_config.cursor_width) 264 req->value = dev->mode_config.cursor_width; 265 else 266 req->value = 64; 267 break; 268 case DRM_CAP_CURSOR_HEIGHT: 269 if (dev->mode_config.cursor_height) 270 req->value = dev->mode_config.cursor_height; 271 else 272 req->value = 64; 273 break; 274 case DRM_CAP_ADDFB2_MODIFIERS: 275 req->value = dev->mode_config.allow_fb_modifiers; 276 break; 277 case DRM_CAP_CRTC_IN_VBLANK_EVENT: 278 req->value = 1; 279 break; 280 default: 281 return -EINVAL; 282 } 283 return 0; 284 } 285 286 /* 287 * Set device/driver capabilities 288 */ 289 static int 290 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 291 { 292 struct drm_set_client_cap *req = data; 293 294 switch (req->capability) { 295 case DRM_CLIENT_CAP_STEREO_3D: 296 if (req->value > 1) 297 return -EINVAL; 298 file_priv->stereo_allowed = req->value; 299 break; 300 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 301 if (req->value > 1) 302 return -EINVAL; 303 file_priv->universal_planes = req->value; 304 break; 305 case DRM_CLIENT_CAP_ATOMIC: 306 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 307 return -EINVAL; 308 if (req->value > 1) 309 return -EINVAL; 310 file_priv->atomic = req->value; 311 file_priv->universal_planes = req->value; 312 break; 313 default: 314 return -EINVAL; 315 } 316 317 return 0; 318 } 319 320 /* 321 * Setversion ioctl. 322 * 323 * \param inode device inode. 324 * \param file_priv DRM file private. 325 * \param cmd command. 326 * \param arg user argument, pointing to a drm_lock structure. 327 * \return zero on success or negative number on failure. 328 * 329 * Sets the requested interface version 330 */ 331 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 332 { 333 struct drm_set_version *sv = data; 334 int if_version, retcode = 0; 335 336 if (sv->drm_di_major != -1) { 337 if (sv->drm_di_major != DRM_IF_MAJOR || 338 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 339 retcode = -EINVAL; 340 goto done; 341 } 342 if_version = DRM_IF_VERSION(sv->drm_di_major, 343 sv->drm_di_minor); 344 dev->if_version = max(if_version, dev->if_version); 345 if (sv->drm_di_minor >= 1) { 346 /* 347 * Version 1.1 includes tying of DRM to specific device 348 * Version 1.4 has proper PCI domain support 349 */ 350 retcode = drm_set_busid(dev, file_priv); 351 if (retcode) 352 goto done; 353 } 354 } 355 356 if (sv->drm_dd_major != -1) { 357 if (sv->drm_dd_major != dev->driver->major || 358 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 359 dev->driver->minor) { 360 retcode = -EINVAL; 361 goto done; 362 } 363 } 364 365 done: 366 sv->drm_di_major = DRM_IF_MAJOR; 367 sv->drm_di_minor = DRM_IF_MINOR; 368 sv->drm_dd_major = dev->driver->major; 369 sv->drm_dd_minor = dev->driver->minor; 370 371 return retcode; 372 } 373 374 /** 375 * drm_noop - DRM no-op ioctl implemntation 376 * @dev: DRM device for the ioctl 377 * @data: data pointer for the ioctl 378 * @file_priv: DRM file for the ioctl call 379 * 380 * This no-op implementation for drm ioctls is useful for deprecated 381 * functionality where we can't return a failure code because existing userspace 382 * checks the result of the ioctl, but doesn't care about the action. 383 * 384 * Always returns successfully with 0. 385 */ 386 int drm_noop(struct drm_device *dev, void *data, 387 struct drm_file *file_priv) 388 { 389 DRM_DEBUG("\n"); 390 return 0; 391 } 392 EXPORT_SYMBOL(drm_noop); 393 394 /** 395 * drm_invalid_op - DRM invalid ioctl implemntation 396 * @dev: DRM device for the ioctl 397 * @data: data pointer for the ioctl 398 * @file_priv: DRM file for the ioctl call 399 * 400 * This no-op implementation for drm ioctls is useful for deprecated 401 * functionality where we really don't want to allow userspace to call the ioctl 402 * any more. This is the case for old ums interfaces for drivers that 403 * transitioned to kms gradually and so kept the old legacy tables around. This 404 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 405 * use this function. 406 * 407 * Always fails with a return value of -EINVAL. 408 */ 409 int drm_invalid_op(struct drm_device *dev, void *data, 410 struct drm_file *file_priv) 411 { 412 return -EINVAL; 413 } 414 EXPORT_SYMBOL(drm_invalid_op); 415 416 /* 417 * Copy and IOCTL return string to user space 418 */ 419 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 420 { 421 int len; 422 423 /* don't overflow userbuf */ 424 len = strlen(value); 425 if (len > *buf_len) 426 len = *buf_len; 427 428 /* let userspace know exact length of driver value (which could be 429 * larger than the userspace-supplied buffer) */ 430 *buf_len = strlen(value); 431 432 /* finally, try filling in the userbuf */ 433 if (len && buf) 434 if (copy_to_user(buf, value, len)) 435 return -EFAULT; 436 return 0; 437 } 438 439 /* 440 * Get version information 441 * 442 * \param inode device inode. 443 * \param filp file pointer. 444 * \param cmd command. 445 * \param arg user argument, pointing to a drm_version structure. 446 * \return zero on success or negative number on failure. 447 * 448 * Fills in the version information in \p arg. 449 */ 450 static int drm_version(struct drm_device *dev, void *data, 451 struct drm_file *file_priv) 452 { 453 static int drm_version_initial; 454 struct drm_version *version = data; 455 int err; 456 457 if (drm_version_initial == 0) { 458 int dummy; 459 460 ++drm_version_initial; 461 tsleep(&dummy, 0, "SDELAY", hz*2); 462 } 463 464 version->version_major = dev->driver->major; 465 version->version_minor = dev->driver->minor; 466 version->version_patchlevel = dev->driver->patchlevel; 467 err = drm_copy_field(version->name, &version->name_len, 468 dev->driver->name); 469 if (!err) 470 err = drm_copy_field(version->date, &version->date_len, 471 dev->driver->date); 472 if (!err) 473 err = drm_copy_field(version->desc, &version->desc_len, 474 dev->driver->desc); 475 476 return err; 477 } 478 479 /* 480 * drm_ioctl_permit - Check ioctl permissions against caller 481 * 482 * @flags: ioctl permission flags. 483 * @file_priv: Pointer to struct drm_file identifying the caller. 484 * 485 * Checks whether the caller is allowed to run an ioctl with the 486 * indicated permissions. If so, returns zero. Otherwise returns an 487 * error code suitable for ioctl return. 488 */ 489 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 490 { 491 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 492 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 493 return -EACCES; 494 495 /* AUTH is only for authenticated or render client */ 496 if (unlikely((flags & DRM_AUTH) && !file_priv->authenticated)) 497 return -EACCES; 498 499 /* MASTER is only for master or control clients */ 500 if (unlikely((flags & DRM_MASTER) && 501 !drm_is_current_master(file_priv) && 502 !drm_is_control_client(file_priv))) 503 return -EACCES; 504 505 #if 0 /* drm_minor_register() must be completed first */ 506 /* Control clients must be explicitly allowed */ 507 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 508 drm_is_control_client(file_priv))) 509 return -EACCES; 510 511 /* Render clients must be explicitly allowed */ 512 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 513 drm_is_render_client(file_priv))) 514 return -EACCES; 515 #endif 516 517 return 0; 518 } 519 EXPORT_SYMBOL(drm_ioctl_permit); 520 521 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 522 [DRM_IOCTL_NR(ioctl)] = { \ 523 .cmd = ioctl, \ 524 .func = _func, \ 525 .flags = _flags, \ 526 .name = #ioctl \ 527 } 528 529 /* Ioctl table */ 530 static const struct drm_ioctl_desc drm_ioctls[] = { 531 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 532 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW), 533 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 534 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED), 535 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 536 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED), 537 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 538 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 539 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 540 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 541 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 542 543 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 544 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 545 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 546 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_UNLOCKED|DRM_MASTER), 547 548 #ifdef __DragonFly__ 549 DRM_IOCTL_DEF(DRM_IOCTL_GET_PCIINFO, drm_getpciinfo, DRM_UNLOCKED|DRM_RENDER_ALLOW), 550 #else 551 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 552 #endif 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_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_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 int drm_ioctl(struct dev_ioctl_args *ap) 662 { 663 struct file *filp = ap->a_fp; 664 u_long cmd = ap->a_cmd; 665 struct drm_file *file_priv = filp->private_data; 666 struct drm_device *dev; 667 const struct drm_ioctl_desc *ioctl = NULL; 668 drm_ioctl_t *func; 669 unsigned int nr = DRM_IOCTL_NR(cmd); 670 int retcode = -EINVAL; 671 caddr_t data = ap->a_data; 672 bool is_driver_ioctl; 673 674 dev = drm_get_device_from_kdev(ap->a_head.a_dev); 675 676 if (drm_device_is_unplugged(dev)) 677 return -ENODEV; 678 679 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 680 681 if (is_driver_ioctl) { 682 /* driver ioctl */ 683 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) 684 goto err_i1; 685 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 686 } else { 687 /* core ioctl */ 688 if (nr >= DRM_CORE_IOCTL_COUNT) 689 goto err_i1; 690 ioctl = &drm_ioctls[nr]; 691 } 692 693 DRM_DEBUG_IOCTL("pid=%d, dev=0x%lx, auth=%d, %s\n", 694 DRM_CURRENTPID, 695 (long)dev->dev, 696 file_priv->authenticated, ioctl->name); 697 698 /* Do not trust userspace, use our own definition */ 699 func = ioctl->func; 700 701 if (unlikely(!func)) { 702 DRM_DEBUG("no function\n"); 703 retcode = -EINVAL; 704 goto err_i1; 705 } 706 707 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 708 if (unlikely(retcode)) 709 goto err_i1; 710 711 /* Enforce sane locking for modern driver ioctls. Core ioctls are 712 * too messy still. */ 713 if ((!drm_core_check_feature(dev, DRIVER_LEGACY) && is_driver_ioctl) || 714 (ioctl->flags & DRM_UNLOCKED)) 715 retcode = -func(dev, data, file_priv); 716 else { 717 mutex_lock(&drm_global_mutex); 718 retcode = -func(dev, data, file_priv); 719 mutex_unlock(&drm_global_mutex); 720 } 721 if (retcode == ERESTARTSYS) 722 retcode = EINTR; 723 724 err_i1: 725 if (!ioctl) 726 DRM_DEBUG_FIOCTL("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02lx, nr=0x%02x\n", 727 DRM_CURRENTPID, 728 (long)dev->dev, 729 file_priv->authenticated, cmd, nr); 730 731 if (retcode) 732 DRM_DEBUG_FIOCTL("ret = %d\n", retcode); 733 return retcode; 734 } 735 EXPORT_SYMBOL(drm_ioctl); 736 737 /** 738 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 739 * @nr: ioctl number 740 * @flags: where to return the ioctl permission flags 741 * 742 * This ioctl is only used by the vmwgfx driver to augment the access checks 743 * done by the drm core and insofar a pretty decent layering violation. This 744 * shouldn't be used by any drivers. 745 * 746 * Returns: 747 * True if the @nr corresponds to a DRM core ioctl number, false otherwise. 748 */ 749 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 750 { 751 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 752 return false; 753 754 if (nr >= DRM_CORE_IOCTL_COUNT) 755 return false; 756 757 *flags = drm_ioctls[nr].flags; 758 return true; 759 } 760 EXPORT_SYMBOL(drm_ioctl_flags); 761