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 <sys/filio.h> 32 33 #include <linux/export.h> 34 #include <linux/nospec.h> 35 #include <linux/pci.h> 36 #include <linux/uaccess.h> 37 38 #include <drm/drm_auth.h> 39 #include <drm/drm_crtc.h> 40 #include <drm/drm_drv.h> 41 #include <drm/drm_file.h> 42 #include <drm/drm_ioctl.h> 43 #include <drm/drm_print.h> 44 45 #include "drm_crtc_internal.h" 46 #include "drm_internal.h" 47 #include "drm_legacy.h" 48 49 /** 50 * DOC: getunique and setversion story 51 * 52 * BEWARE THE DRAGONS! MIND THE TRAPDOORS! 53 * 54 * In an attempt to warn anyone else who's trying to figure out what's going 55 * on here, I'll try to summarize the story. First things first, let's clear up 56 * the names, because the kernel internals, libdrm and the ioctls are all named 57 * differently: 58 * 59 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm 60 * through the drmGetBusid function. 61 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All 62 * that code is nerved in the kernel with drm_invalid_op(). 63 * - The internal set_busid kernel functions and driver callbacks are 64 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is 65 * nerved) allowed userspace to set the busid through the above ioctl. 66 * - Other ioctls and functions involved are named consistently. 67 * 68 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly 69 * handling pci domains in the busid on ppc. Doing this correctly was only 70 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's 71 * special with drm 1.2 and 1.3. 72 * 73 * Now the actual horror story of how device lookup in drm works. At large, 74 * there's 2 different ways, either by busid, or by device driver name. 75 * 76 * Opening by busid is fairly simple: 77 * 78 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a 79 * side-effect this fills out the unique name in the master structure. 80 * 2. Call GET_UNIQUE to read out the unique name from the master structure, 81 * which matches the busid thanks to step 1. If it doesn't, proceed to try 82 * the next device node. 83 * 84 * Opening by name is slightly different: 85 * 86 * 1. Directly call VERSION to get the version and to match against the driver 87 * name returned by that ioctl. Note that SET_VERSION is not called, which 88 * means the the unique name for the master node just opening is _not_ filled 89 * out. This despite that with current drm device nodes are always bound to 90 * one device, and can't be runtime assigned like with drm 1.0. 91 * 2. Match driver name. If it mismatches, proceed to the next device node. 92 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by 93 * checking that the first byte in the string is 0). If that's not the case 94 * libdrm skips and proceeds to the next device node. Probably this is just 95 * copypasta from drm 1.0 times where a set unique name meant that the driver 96 * was in use already, but that's just conjecture. 97 * 98 * Long story short: To keep the open by name logic working, GET_UNIQUE must 99 * _not_ return a unique string when SET_VERSION hasn't been called yet, 100 * otherwise libdrm breaks. Even when that unique string can't ever change, and 101 * is totally irrelevant for actually opening the device because runtime 102 * assignable device instances were only support in drm 1.0, which is long dead. 103 * But the libdrm code in drmOpenByName somehow survived, hence this can't be 104 * broken. 105 */ 106 107 /* 108 * Get the bus id. 109 * 110 * \param inode device inode. 111 * \param file_priv DRM file private. 112 * \param cmd command. 113 * \param arg user argument, pointing to a drm_unique structure. 114 * \return zero on success or a negative number on failure. 115 * 116 * Copies the bus id from drm_device::unique into user space. 117 */ 118 int drm_getunique(struct drm_device *dev, void *data, 119 struct drm_file *file_priv) 120 { 121 struct drm_unique *u = data; 122 struct drm_master *master; 123 124 mutex_lock(&dev->master_mutex); 125 master = file_priv->master; 126 if (u->unique_len >= master->unique_len) { 127 if (copy_to_user(u->unique, master->unique, master->unique_len)) { 128 mutex_unlock(&dev->master_mutex); 129 return -EFAULT; 130 } 131 } 132 u->unique_len = master->unique_len; 133 mutex_unlock(&dev->master_mutex); 134 135 return 0; 136 } 137 138 static void 139 drm_unset_busid(struct drm_device *dev, 140 struct drm_master *master) 141 { 142 kfree(master->unique); 143 master->unique = NULL; 144 master->unique_len = 0; 145 } 146 147 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 148 { 149 struct drm_master *master = file_priv->master; 150 int ret; 151 152 if (master->unique != NULL) 153 drm_unset_busid(dev, master); 154 155 #ifdef __linux__ 156 if (dev->dev && dev_is_pci(dev->dev)) { 157 #else 158 if (1) { 159 #endif 160 ret = drm_pci_set_busid(dev, master); 161 if (ret) { 162 drm_unset_busid(dev, master); 163 return ret; 164 } 165 } else { 166 WARN_ON(!dev->unique); 167 master->unique = kstrdup(dev->unique, GFP_KERNEL); 168 if (master->unique) 169 master->unique_len = strlen(dev->unique); 170 } 171 172 return 0; 173 } 174 175 /* 176 * Get client information. 177 * 178 * \param inode device inode. 179 * \param file_priv DRM file private. 180 * \param cmd command. 181 * \param arg user argument, pointing to a drm_client structure. 182 * 183 * \return zero on success or a negative number on failure. 184 * 185 * Searches for the client with the specified index and copies its information 186 * into userspace 187 */ 188 int drm_getclient(struct drm_device *dev, void *data, 189 struct drm_file *file_priv) 190 { 191 struct drm_client *client = data; 192 193 /* 194 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 195 * not breaking completely. Userspace tools stop enumerating one they 196 * get -EINVAL, hence this is the return value we need to hand back for 197 * no clients tracked. 198 * 199 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 200 * attempt to figure out whether they're authenticated or not. Since 201 * that's the only thing they care about, give it to the directly 202 * instead of walking one giant list. 203 */ 204 if (client->idx == 0) { 205 client->auth = file_priv->authenticated; 206 #ifdef __linux__ 207 client->pid = task_pid_vnr(current); 208 client->uid = overflowuid; 209 #else 210 client->pid = curproc->p_p->ps_pid; 211 client->uid = 0xfffe; 212 #endif 213 client->magic = 0; 214 client->iocs = 0; 215 216 return 0; 217 } else { 218 return -EINVAL; 219 } 220 } 221 222 /* 223 * Get statistics information. 224 * 225 * \param inode device inode. 226 * \param file_priv DRM file private. 227 * \param cmd command. 228 * \param arg user argument, pointing to a drm_stats structure. 229 * 230 * \return zero on success or a negative number on failure. 231 */ 232 static int drm_getstats(struct drm_device *dev, void *data, 233 struct drm_file *file_priv) 234 { 235 struct drm_stats *stats = data; 236 237 /* Clear stats to prevent userspace from eating its stack garbage. */ 238 memset(stats, 0, sizeof(*stats)); 239 240 return 0; 241 } 242 243 /* 244 * Get device/driver capabilities 245 */ 246 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 247 { 248 struct drm_get_cap *req = data; 249 struct drm_crtc *crtc; 250 251 req->value = 0; 252 253 /* Only some caps make sense with UMS/render-only drivers. */ 254 switch (req->capability) { 255 case DRM_CAP_TIMESTAMP_MONOTONIC: 256 req->value = 1; 257 return 0; 258 case DRM_CAP_PRIME: 259 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 260 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 261 return 0; 262 case DRM_CAP_SYNCOBJ: 263 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ); 264 return 0; 265 case DRM_CAP_SYNCOBJ_TIMELINE: 266 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE); 267 return 0; 268 } 269 270 /* Other caps only work with KMS drivers */ 271 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 272 return -EOPNOTSUPP; 273 274 switch (req->capability) { 275 case DRM_CAP_DUMB_BUFFER: 276 if (dev->driver->dumb_create) 277 req->value = 1; 278 break; 279 case DRM_CAP_VBLANK_HIGH_CRTC: 280 req->value = 1; 281 break; 282 case DRM_CAP_DUMB_PREFERRED_DEPTH: 283 req->value = dev->mode_config.preferred_depth; 284 break; 285 case DRM_CAP_DUMB_PREFER_SHADOW: 286 req->value = dev->mode_config.prefer_shadow; 287 break; 288 case DRM_CAP_ASYNC_PAGE_FLIP: 289 req->value = dev->mode_config.async_page_flip; 290 break; 291 case DRM_CAP_PAGE_FLIP_TARGET: 292 req->value = 1; 293 drm_for_each_crtc(crtc, dev) { 294 if (!crtc->funcs->page_flip_target) 295 req->value = 0; 296 } 297 break; 298 case DRM_CAP_CURSOR_WIDTH: 299 if (dev->mode_config.cursor_width) 300 req->value = dev->mode_config.cursor_width; 301 else 302 req->value = 64; 303 break; 304 case DRM_CAP_CURSOR_HEIGHT: 305 if (dev->mode_config.cursor_height) 306 req->value = dev->mode_config.cursor_height; 307 else 308 req->value = 64; 309 break; 310 case DRM_CAP_ADDFB2_MODIFIERS: 311 req->value = dev->mode_config.allow_fb_modifiers; 312 break; 313 case DRM_CAP_CRTC_IN_VBLANK_EVENT: 314 req->value = 1; 315 break; 316 default: 317 return -EINVAL; 318 } 319 return 0; 320 } 321 322 /* 323 * Set device/driver capabilities 324 */ 325 static int 326 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 327 { 328 struct drm_set_client_cap *req = data; 329 330 /* No render-only settable capabilities for now */ 331 332 /* Below caps that only works with KMS drivers */ 333 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 334 return -EOPNOTSUPP; 335 336 switch (req->capability) { 337 case DRM_CLIENT_CAP_STEREO_3D: 338 if (req->value > 1) 339 return -EINVAL; 340 file_priv->stereo_allowed = req->value; 341 break; 342 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 343 if (req->value > 1) 344 return -EINVAL; 345 file_priv->universal_planes = req->value; 346 break; 347 case DRM_CLIENT_CAP_ATOMIC: 348 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 349 return -EOPNOTSUPP; 350 /* The modesetting DDX has a totally broken idea of atomic. */ 351 #ifdef __linux__ 352 if (current->comm[0] == 'X' && req->value == 1) { 353 #else 354 if (curproc->p_p->ps_comm[0] == 'X' && req->value == 1) { 355 #endif 356 pr_info("broken atomic modeset userspace detected, disabling atomic\n"); 357 return -EOPNOTSUPP; 358 } 359 if (req->value > 2) 360 return -EINVAL; 361 file_priv->atomic = req->value; 362 file_priv->universal_planes = req->value; 363 /* 364 * No atomic user-space blows up on aspect ratio mode bits. 365 */ 366 file_priv->aspect_ratio_allowed = req->value; 367 break; 368 case DRM_CLIENT_CAP_ASPECT_RATIO: 369 if (req->value > 1) 370 return -EINVAL; 371 file_priv->aspect_ratio_allowed = req->value; 372 break; 373 case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS: 374 if (!file_priv->atomic) 375 return -EINVAL; 376 if (req->value > 1) 377 return -EINVAL; 378 file_priv->writeback_connectors = req->value; 379 break; 380 default: 381 return -EINVAL; 382 } 383 384 return 0; 385 } 386 387 /* 388 * Setversion ioctl. 389 * 390 * \param inode device inode. 391 * \param file_priv DRM file private. 392 * \param cmd command. 393 * \param arg user argument, pointing to a drm_lock structure. 394 * \return zero on success or negative number on failure. 395 * 396 * Sets the requested interface version 397 */ 398 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 399 { 400 struct drm_set_version *sv = data; 401 int if_version, retcode = 0; 402 403 mutex_lock(&dev->master_mutex); 404 if (sv->drm_di_major != -1) { 405 if (sv->drm_di_major != DRM_IF_MAJOR || 406 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 407 retcode = -EINVAL; 408 goto done; 409 } 410 if_version = DRM_IF_VERSION(sv->drm_di_major, 411 sv->drm_di_minor); 412 dev->if_version = max(if_version, dev->if_version); 413 if (sv->drm_di_minor >= 1) { 414 /* 415 * Version 1.1 includes tying of DRM to specific device 416 * Version 1.4 has proper PCI domain support 417 */ 418 retcode = drm_set_busid(dev, file_priv); 419 if (retcode) 420 goto done; 421 } 422 } 423 424 if (sv->drm_dd_major != -1) { 425 if (sv->drm_dd_major != dev->driver->major || 426 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 427 dev->driver->minor) { 428 retcode = -EINVAL; 429 goto done; 430 } 431 } 432 433 done: 434 sv->drm_di_major = DRM_IF_MAJOR; 435 sv->drm_di_minor = DRM_IF_MINOR; 436 sv->drm_dd_major = dev->driver->major; 437 sv->drm_dd_minor = dev->driver->minor; 438 mutex_unlock(&dev->master_mutex); 439 440 return retcode; 441 } 442 443 /** 444 * drm_noop - DRM no-op ioctl implementation 445 * @dev: DRM device for the ioctl 446 * @data: data pointer for the ioctl 447 * @file_priv: DRM file for the ioctl call 448 * 449 * This no-op implementation for drm ioctls is useful for deprecated 450 * functionality where we can't return a failure code because existing userspace 451 * checks the result of the ioctl, but doesn't care about the action. 452 * 453 * Always returns successfully with 0. 454 */ 455 int drm_noop(struct drm_device *dev, void *data, 456 struct drm_file *file_priv) 457 { 458 DRM_DEBUG("\n"); 459 return 0; 460 } 461 EXPORT_SYMBOL(drm_noop); 462 463 /** 464 * drm_invalid_op - DRM invalid ioctl implementation 465 * @dev: DRM device for the ioctl 466 * @data: data pointer for the ioctl 467 * @file_priv: DRM file for the ioctl call 468 * 469 * This no-op implementation for drm ioctls is useful for deprecated 470 * functionality where we really don't want to allow userspace to call the ioctl 471 * any more. This is the case for old ums interfaces for drivers that 472 * transitioned to kms gradually and so kept the old legacy tables around. This 473 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 474 * use this function. 475 * 476 * Always fails with a return value of -EINVAL. 477 */ 478 int drm_invalid_op(struct drm_device *dev, void *data, 479 struct drm_file *file_priv) 480 { 481 return -EINVAL; 482 } 483 EXPORT_SYMBOL(drm_invalid_op); 484 485 /* 486 * Copy and IOCTL return string to user space 487 */ 488 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 489 { 490 int len; 491 492 /* don't overflow userbuf */ 493 len = strlen(value); 494 if (len > *buf_len) 495 len = *buf_len; 496 497 /* let userspace know exact length of driver value (which could be 498 * larger than the userspace-supplied buffer) */ 499 *buf_len = strlen(value); 500 501 /* finally, try filling in the userbuf */ 502 if (len && buf) 503 if (copy_to_user(buf, value, len)) 504 return -EFAULT; 505 return 0; 506 } 507 508 /* 509 * Get version information 510 * 511 * \param inode device inode. 512 * \param filp file pointer. 513 * \param cmd command. 514 * \param arg user argument, pointing to a drm_version structure. 515 * \return zero on success or negative number on failure. 516 * 517 * Fills in the version information in \p arg. 518 */ 519 int drm_version(struct drm_device *dev, void *data, 520 struct drm_file *file_priv) 521 { 522 struct drm_version *version = data; 523 int err; 524 525 version->version_major = dev->driver->major; 526 version->version_minor = dev->driver->minor; 527 version->version_patchlevel = dev->driver->patchlevel; 528 err = drm_copy_field(version->name, &version->name_len, 529 dev->driver->name); 530 if (!err) 531 err = drm_copy_field(version->date, &version->date_len, 532 dev->driver->date); 533 if (!err) 534 err = drm_copy_field(version->desc, &version->desc_len, 535 dev->driver->desc); 536 537 return err; 538 } 539 540 /** 541 * drm_ioctl_permit - Check ioctl permissions against caller 542 * 543 * @flags: ioctl permission flags. 544 * @file_priv: Pointer to struct drm_file identifying the caller. 545 * 546 * Checks whether the caller is allowed to run an ioctl with the 547 * indicated permissions. 548 * 549 * Returns: 550 * Zero if allowed, -EACCES otherwise. 551 */ 552 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 553 { 554 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 555 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 556 return -EACCES; 557 558 /* AUTH is only for authenticated or render client */ 559 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 560 !file_priv->authenticated)) 561 return -EACCES; 562 563 /* MASTER is only for master or control clients */ 564 if (unlikely((flags & DRM_MASTER) && 565 !drm_is_current_master(file_priv))) 566 return -EACCES; 567 568 /* Render clients must be explicitly allowed */ 569 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 570 drm_is_render_client(file_priv))) 571 return -EACCES; 572 573 return 0; 574 } 575 EXPORT_SYMBOL(drm_ioctl_permit); 576 577 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 578 [DRM_IOCTL_NR(ioctl)] = { \ 579 .cmd = ioctl, \ 580 .func = _func, \ 581 .flags = _flags, \ 582 .name = #ioctl \ 583 } 584 585 #if IS_ENABLED(CONFIG_DRM_LEGACY) 586 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags) 587 #else 588 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags) 589 #endif 590 591 /* Ioctl table */ 592 static const struct drm_ioctl_desc drm_ioctls[] = { 593 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW), 594 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 595 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 596 #ifdef __linux__ 597 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_legacy_irq_by_busid, 598 DRM_MASTER|DRM_ROOT_ONLY), 599 #endif 600 601 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0), 602 603 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 604 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 605 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW), 606 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 607 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 608 609 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 610 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 611 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 612 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_MASTER), 613 614 #ifdef __linux__ 615 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 616 #else 617 DRM_IOCTL_DEF(DRM_IOCTL_GET_PCIINFO, drm_getpciinfo, DRM_UNLOCKED|DRM_RENDER_ALLOW), 618 #endif 619 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 620 621 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 622 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 623 624 #ifdef __linux__ 625 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, 0), 626 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, 0), 627 #else 628 /* On OpenBSD xorg privdrop has already occurred before this point */ 629 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_noop, DRM_UNLOCKED), 630 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_noop, DRM_UNLOCKED), 631 #endif 632 633 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 634 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 635 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 636 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 637 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 638 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 639 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 640 641 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 642 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 643 644 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 645 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 646 647 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 648 649 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 650 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 651 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 652 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 653 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 654 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 655 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 656 657 #if IS_ENABLED(CONFIG_AGP) && defined(__linux__) 658 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_legacy_agp_acquire_ioctl, 659 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 660 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_legacy_agp_release_ioctl, 661 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 662 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_legacy_agp_enable_ioctl, 663 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 664 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_legacy_agp_info_ioctl, DRM_AUTH), 665 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_legacy_agp_alloc_ioctl, 666 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 667 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_legacy_agp_free_ioctl, 668 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 669 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_legacy_agp_bind_ioctl, 670 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 671 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_legacy_agp_unbind_ioctl, 672 DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 673 #endif 674 675 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 676 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 677 678 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED), 679 680 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0), 681 682 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 683 684 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW), 685 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH), 686 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH), 687 688 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0), 689 690 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW), 691 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW), 692 693 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0), 694 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0), 695 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER), 696 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0), 697 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER), 698 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER), 699 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0), 700 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER), 701 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0), 702 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0), 703 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER), 704 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER), 705 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0), 706 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER), 707 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0), 708 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0), 709 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB2, drm_mode_getfb2_ioctl, 0), 710 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0), 711 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0), 712 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0), 713 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER), 714 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER), 715 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0), 716 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0), 717 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0), 718 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0), 719 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER), 720 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER), 721 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER), 722 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0), 723 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0), 724 725 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl, 726 DRM_RENDER_ALLOW), 727 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl, 728 DRM_RENDER_ALLOW), 729 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl, 730 DRM_RENDER_ALLOW), 731 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl, 732 DRM_RENDER_ALLOW), 733 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl, 734 DRM_RENDER_ALLOW), 735 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl, 736 DRM_RENDER_ALLOW), 737 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl, 738 DRM_RENDER_ALLOW), 739 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, 740 DRM_RENDER_ALLOW), 741 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, 742 DRM_RENDER_ALLOW), 743 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl, 744 DRM_RENDER_ALLOW), 745 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl, 746 DRM_RENDER_ALLOW), 747 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0), 748 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0), 749 #ifdef __linux__ 750 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER), 751 DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER), 752 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER), 753 DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER), 754 #endif 755 }; 756 757 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 758 759 int 760 pledge_ioctl_drm(struct proc *p, long com, dev_t device) 761 { 762 struct drm_device *dev = drm_get_device_from_kdev(device); 763 unsigned int nr = DRM_IOCTL_NR(com); 764 const struct drm_ioctl_desc *ioctl; 765 766 if (dev == NULL) 767 return EPERM; 768 769 if (nr < DRM_CORE_IOCTL_COUNT && 770 ((nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END))) 771 ioctl = &drm_ioctls[nr]; 772 else if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END && 773 nr < DRM_COMMAND_BASE + dev->driver->num_ioctls) 774 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 775 else 776 return EPERM; 777 778 if (ioctl->flags & DRM_RENDER_ALLOW) 779 return 0; 780 781 /* 782 * These are dangerous, but we have to allow them until we 783 * have prime/dma-buf support. 784 */ 785 switch (com) { 786 case DRM_IOCTL_GET_MAGIC: 787 case DRM_IOCTL_GEM_OPEN: 788 return 0; 789 } 790 791 /* for amdgpu libdrm */ 792 if (com == DRM_IOCTL_GET_CLIENT) 793 return 0; 794 795 return EPERM; 796 } 797 798 /** 799 * DOC: driver specific ioctls 800 * 801 * First things first, driver private IOCTLs should only be needed for drivers 802 * supporting rendering. Kernel modesetting is all standardized, and extended 803 * through properties. There are a few exceptions in some existing drivers, 804 * which define IOCTL for use by the display DRM master, but they all predate 805 * properties. 806 * 807 * Now if you do have a render driver you always have to support it through 808 * driver private properties. There's a few steps needed to wire all the things 809 * up. 810 * 811 * First you need to define the structure for your IOCTL in your driver private 812 * UAPI header in ``include/uapi/drm/my_driver_drm.h``:: 813 * 814 * struct my_driver_operation { 815 * u32 some_thing; 816 * u32 another_thing; 817 * }; 818 * 819 * Please make sure that you follow all the best practices from 820 * ``Documentation/process/botching-up-ioctls.rst``. Note that drm_ioctl() 821 * automatically zero-extends structures, hence make sure you can add more stuff 822 * at the end, i.e. don't put a variable sized array there. 823 * 824 * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(), 825 * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix:: 826 * 827 * ##define DRM_IOCTL_MY_DRIVER_OPERATION \ 828 * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation) 829 * 830 * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to 831 * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire 832 * up the handlers and set the access rights:: 833 * 834 * static const struct drm_ioctl_desc my_driver_ioctls[] = { 835 * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation, 836 * DRM_AUTH|DRM_RENDER_ALLOW), 837 * }; 838 * 839 * And then assign this to the &drm_driver.ioctls field in your driver 840 * structure. 841 * 842 * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how 843 * the driver-specific IOCTLs are wired up. 844 */ 845 846 long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata, 847 u32 flags) 848 { 849 STUB(); 850 return -ENOSYS; 851 #ifdef notyet 852 struct drm_file *file_priv = file->private_data; 853 struct drm_device *dev = file_priv->minor->dev; 854 int retcode; 855 856 if (drm_dev_is_unplugged(dev)) 857 return -ENODEV; 858 859 retcode = drm_ioctl_permit(flags, file_priv); 860 if (unlikely(retcode)) 861 return retcode; 862 863 /* Enforce sane locking for modern driver ioctls. */ 864 if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) || 865 (flags & DRM_UNLOCKED)) 866 retcode = func(dev, kdata, file_priv); 867 else { 868 mutex_lock(&drm_global_mutex); 869 retcode = func(dev, kdata, file_priv); 870 mutex_unlock(&drm_global_mutex); 871 } 872 return retcode; 873 #endif 874 } 875 EXPORT_SYMBOL(drm_ioctl_kernel); 876 877 /** 878 * drm_ioctl - ioctl callback implementation for DRM drivers 879 * @filp: file this ioctl is called on 880 * @cmd: ioctl cmd number 881 * @arg: user argument 882 * 883 * Looks up the ioctl function in the DRM core and the driver dispatch table, 884 * stored in &drm_driver.ioctls. It checks for necessary permission by calling 885 * drm_ioctl_permit(), and dispatches to the respective function. 886 * 887 * Returns: 888 * Zero on success, negative error code on failure. 889 */ 890 long drm_ioctl(struct file *filp, 891 unsigned int cmd, unsigned long arg) 892 { 893 STUB(); 894 return -ENOSYS; 895 #ifdef notyet 896 struct drm_file *file_priv = filp->private_data; 897 struct drm_device *dev; 898 const struct drm_ioctl_desc *ioctl = NULL; 899 drm_ioctl_t *func; 900 unsigned int nr = DRM_IOCTL_NR(cmd); 901 int retcode = -EINVAL; 902 char stack_kdata[128]; 903 char *kdata = NULL; 904 unsigned int in_size, out_size, drv_size, ksize; 905 bool is_driver_ioctl; 906 907 dev = file_priv->minor->dev; 908 909 if (drm_dev_is_unplugged(dev)) 910 return -ENODEV; 911 912 if (DRM_IOCTL_TYPE(cmd) != DRM_IOCTL_BASE) 913 return -ENOTTY; 914 915 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 916 917 if (is_driver_ioctl) { 918 /* driver ioctl */ 919 unsigned int index = nr - DRM_COMMAND_BASE; 920 921 if (index >= dev->driver->num_ioctls) 922 goto err_i1; 923 index = array_index_nospec(index, dev->driver->num_ioctls); 924 ioctl = &dev->driver->ioctls[index]; 925 } else { 926 /* core ioctl */ 927 if (nr >= DRM_CORE_IOCTL_COUNT) 928 goto err_i1; 929 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 930 ioctl = &drm_ioctls[nr]; 931 } 932 933 drv_size = _IOC_SIZE(ioctl->cmd); 934 out_size = in_size = _IOC_SIZE(cmd); 935 if ((cmd & ioctl->cmd & IOC_IN) == 0) 936 in_size = 0; 937 if ((cmd & ioctl->cmd & IOC_OUT) == 0) 938 out_size = 0; 939 ksize = max(max(in_size, out_size), drv_size); 940 941 DRM_DEBUG("comm=\"%s\" pid=%d, dev=0x%lx, auth=%d, %s\n", 942 current->comm, task_pid_nr(current), 943 (long)old_encode_dev(file_priv->minor->kdev->devt), 944 file_priv->authenticated, ioctl->name); 945 946 /* Do not trust userspace, use our own definition */ 947 func = ioctl->func; 948 949 if (unlikely(!func)) { 950 DRM_DEBUG("no function\n"); 951 retcode = -EINVAL; 952 goto err_i1; 953 } 954 955 if (ksize <= sizeof(stack_kdata)) { 956 kdata = stack_kdata; 957 } else { 958 kdata = kmalloc(ksize, GFP_KERNEL); 959 if (!kdata) { 960 retcode = -ENOMEM; 961 goto err_i1; 962 } 963 } 964 965 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { 966 retcode = -EFAULT; 967 goto err_i1; 968 } 969 970 if (ksize > in_size) 971 memset(kdata + in_size, 0, ksize - in_size); 972 973 retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags); 974 if (copy_to_user((void __user *)arg, kdata, out_size) != 0) 975 retcode = -EFAULT; 976 977 err_i1: 978 if (!ioctl) 979 DRM_DEBUG("invalid ioctl: comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 980 current->comm, task_pid_nr(current), 981 (long)old_encode_dev(file_priv->minor->kdev->devt), 982 file_priv->authenticated, cmd, nr); 983 984 if (kdata != stack_kdata) 985 kfree(kdata); 986 if (retcode) 987 DRM_DEBUG("comm=\"%s\", pid=%d, ret=%d\n", current->comm, 988 task_pid_nr(current), retcode); 989 return retcode; 990 #endif 991 } 992 EXPORT_SYMBOL(drm_ioctl); 993 994 /** 995 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 996 * @nr: ioctl number 997 * @flags: where to return the ioctl permission flags 998 * 999 * This ioctl is only used by the vmwgfx driver to augment the access checks 1000 * done by the drm core and insofar a pretty decent layering violation. This 1001 * shouldn't be used by any drivers. 1002 * 1003 * Returns: 1004 * True if the @nr corresponds to a DRM core ioctl number, false otherwise. 1005 */ 1006 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 1007 { 1008 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 1009 return false; 1010 1011 if (nr >= DRM_CORE_IOCTL_COUNT) 1012 return false; 1013 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 1014 1015 *flags = drm_ioctls[nr].flags; 1016 return true; 1017 } 1018 EXPORT_SYMBOL(drm_ioctl_flags); 1019 1020 int 1021 drm_do_ioctl(struct drm_device *dev, int minor, u_long cmd, caddr_t data) 1022 { 1023 struct drm_file *file_priv; 1024 const struct drm_ioctl_desc *ioctl; 1025 drm_ioctl_t *func; 1026 unsigned int nr = DRM_IOCTL_NR(cmd); 1027 int retcode = -EINVAL; 1028 unsigned int usize, asize; 1029 caddr_t adata = data; 1030 1031 mutex_lock(&dev->filelist_mutex); 1032 file_priv = drm_find_file_by_minor(dev, minor); 1033 mutex_unlock(&dev->filelist_mutex); 1034 if (file_priv == NULL) { 1035 DRM_ERROR("can't find authenticator\n"); 1036 return -EINVAL; 1037 } 1038 1039 DRM_DEBUG("pid=%d, cmd=0x%02lx, nr=0x%02x, dev 0x%lx, auth=%d\n", 1040 curproc->p_p->ps_pid, cmd, (u_int)DRM_IOCTL_NR(cmd), (long)&dev->dev, 1041 file_priv->authenticated); 1042 1043 switch (cmd) { 1044 case FIONBIO: 1045 case FIOASYNC: 1046 return 0; 1047 } 1048 1049 if ((nr >= DRM_CORE_IOCTL_COUNT) && 1050 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 1051 return (-EINVAL); 1052 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 1053 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 1054 uint32_t drv_size; 1055 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 1056 drv_size = IOCPARM_LEN(ioctl->cmd); 1057 usize = asize = IOCPARM_LEN(cmd); 1058 if (drv_size > asize) 1059 asize = drv_size; 1060 } else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 1061 uint32_t drv_size; 1062 ioctl = &drm_ioctls[nr]; 1063 1064 drv_size = IOCPARM_LEN(ioctl->cmd); 1065 usize = asize = IOCPARM_LEN(cmd); 1066 if (drv_size > asize) 1067 asize = drv_size; 1068 cmd = ioctl->cmd; 1069 } else 1070 return (-EINVAL); 1071 1072 func = ioctl->func; 1073 if (!func) { 1074 DRM_DEBUG("no function\n"); 1075 return (-EINVAL); 1076 } 1077 1078 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 1079 if (unlikely(retcode)) 1080 return retcode; 1081 1082 if (asize > usize) { 1083 adata = malloc(asize, M_DRM, M_WAITOK | M_ZERO); 1084 memcpy(adata, data, usize); 1085 } 1086 1087 /* Enforce sane locking for modern driver ioctls. */ 1088 if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) || 1089 (ioctl->flags & DRM_UNLOCKED)) 1090 retcode = func(dev, adata, file_priv); 1091 else { 1092 mutex_lock(&drm_global_mutex); 1093 retcode = func(dev, adata, file_priv); 1094 mutex_unlock(&drm_global_mutex); 1095 } 1096 1097 if (asize > usize) { 1098 memcpy(data, adata, usize); 1099 free(adata, M_DRM, asize); 1100 } 1101 1102 return (retcode); 1103 } 1104 1105 /* drmioctl is called whenever a process performs an ioctl on /dev/drm. 1106 */ 1107 int 1108 drmioctl(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) 1109 { 1110 struct drm_device *dev = drm_get_device_from_kdev(kdev); 1111 int error; 1112 1113 if (dev == NULL) 1114 return ENODEV; 1115 1116 mtx_enter(&dev->quiesce_mtx); 1117 while (dev->quiesce) 1118 msleep_nsec(&dev->quiesce, &dev->quiesce_mtx, PZERO, "drmioc", 1119 INFSLP); 1120 dev->quiesce_count++; 1121 mtx_leave(&dev->quiesce_mtx); 1122 1123 error = -drm_do_ioctl(dev, minor(kdev), cmd, data); 1124 if (error < 0 && error != ERESTART && error != EJUSTRETURN) 1125 printf("%s: cmd 0x%lx errno %d\n", __func__, cmd, error); 1126 1127 mtx_enter(&dev->quiesce_mtx); 1128 dev->quiesce_count--; 1129 if (dev->quiesce) 1130 wakeup(&dev->quiesce_count); 1131 mtx_leave(&dev->quiesce_mtx); 1132 1133 return (error); 1134 } 1135