drm_ioctl.c revision 1.13
1 /* $NetBSD: drm_ioctl.c,v 1.13 2021/12/18 23:44:57 riastradh Exp $ */ 2 3 /* 4 * Created: Fri Jan 8 09:01:26 1999 by faith (at) valinux.com 5 * 6 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 7 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 8 * All Rights Reserved. 9 * 10 * Author Rickard E. (Rik) Faith <faith (at) valinux.com> 11 * Author Gareth Hughes <gareth (at) valinux.com> 12 * 13 * Permission is hereby granted, free of charge, to any person obtaining a 14 * copy of this software and associated documentation files (the "Software"), 15 * to deal in the Software without restriction, including without limitation 16 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 17 * and/or sell copies of the Software, and to permit persons to whom the 18 * Software is furnished to do so, subject to the following conditions: 19 * 20 * The above copyright notice and this permission notice (including the next 21 * paragraph) shall be included in all copies or substantial portions of the 22 * Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 30 * OTHER DEALINGS IN THE SOFTWARE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: drm_ioctl.c,v 1.13 2021/12/18 23:44:57 riastradh Exp $"); 35 36 #include <linux/export.h> 37 #include <linux/nospec.h> 38 #include <linux/pci.h> 39 #include <linux/uaccess.h> 40 41 #include <drm/drm_agpsupport.h> 42 #include <drm/drm_auth.h> 43 #include <drm/drm_crtc.h> 44 #include <drm/drm_drv.h> 45 #include <drm/drm_file.h> 46 #include <drm/drm_ioctl.h> 47 #include <drm/drm_print.h> 48 49 #include "drm_crtc_internal.h" 50 #include "drm_internal.h" 51 #include "drm_legacy.h" 52 53 /** 54 * DOC: getunique and setversion story 55 * 56 * BEWARE THE DRAGONS! MIND THE TRAPDOORS! 57 * 58 * In an attempt to warn anyone else who's trying to figure out what's going 59 * on here, I'll try to summarize the story. First things first, let's clear up 60 * the names, because the kernel internals, libdrm and the ioctls are all named 61 * differently: 62 * 63 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm 64 * through the drmGetBusid function. 65 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All 66 * that code is nerved in the kernel with drm_invalid_op(). 67 * - The internal set_busid kernel functions and driver callbacks are 68 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is 69 * nerved) allowed userspace to set the busid through the above ioctl. 70 * - Other ioctls and functions involved are named consistently. 71 * 72 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly 73 * handling pci domains in the busid on ppc. Doing this correctly was only 74 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's 75 * special with drm 1.2 and 1.3. 76 * 77 * Now the actual horror story of how device lookup in drm works. At large, 78 * there's 2 different ways, either by busid, or by device driver name. 79 * 80 * Opening by busid is fairly simple: 81 * 82 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a 83 * side-effect this fills out the unique name in the master structure. 84 * 2. Call GET_UNIQUE to read out the unique name from the master structure, 85 * which matches the busid thanks to step 1. If it doesn't, proceed to try 86 * the next device node. 87 * 88 * Opening by name is slightly different: 89 * 90 * 1. Directly call VERSION to get the version and to match against the driver 91 * name returned by that ioctl. Note that SET_VERSION is not called, which 92 * means the the unique name for the master node just opening is _not_ filled 93 * out. This despite that with current drm device nodes are always bound to 94 * one device, and can't be runtime assigned like with drm 1.0. 95 * 2. Match driver name. If it mismatches, proceed to the next device node. 96 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by 97 * checking that the first byte in the string is 0). If that's not the case 98 * libdrm skips and proceeds to the next device node. Probably this is just 99 * copypasta from drm 1.0 times where a set unique name meant that the driver 100 * was in use already, but that's just conjecture. 101 * 102 * Long story short: To keep the open by name logic working, GET_UNIQUE must 103 * _not_ return a unique string when SET_VERSION hasn't been called yet, 104 * otherwise libdrm breaks. Even when that unique string can't ever change, and 105 * is totally irrelevant for actually opening the device because runtime 106 * assignable device instances were only support in drm 1.0, which is long dead. 107 * But the libdrm code in drmOpenByName somehow survived, hence this can't be 108 * broken. 109 */ 110 111 /* 112 * Get the bus id. 113 * 114 * \param inode device inode. 115 * \param file_priv DRM file private. 116 * \param cmd command. 117 * \param arg user argument, pointing to a drm_unique structure. 118 * \return zero on success or a negative number on failure. 119 * 120 * Copies the bus id from drm_device::unique into user space. 121 */ 122 int drm_getunique(struct drm_device *dev, void *data, 123 struct drm_file *file_priv) 124 { 125 struct drm_unique *u = data; 126 struct drm_master *master = file_priv->master; 127 128 mutex_lock(&master->dev->master_mutex); 129 if (u->unique_len >= master->unique_len) { 130 if (copy_to_user(u->unique, master->unique, master->unique_len)) { 131 mutex_unlock(&master->dev->master_mutex); 132 return -EFAULT; 133 } 134 } 135 u->unique_len = master->unique_len; 136 mutex_unlock(&master->dev->master_mutex); 137 138 return 0; 139 } 140 141 static void 142 drm_unset_busid(struct drm_device *dev, 143 struct drm_master *master) 144 { 145 kfree(master->unique); 146 master->unique = NULL; 147 master->unique_len = 0; 148 } 149 150 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 151 { 152 struct drm_master *master = file_priv->master; 153 int ret; 154 155 if (master->unique != NULL) 156 drm_unset_busid(dev, master); 157 158 if (dev->dev && dev_is_pci(dev->dev)) { 159 ret = drm_pci_set_busid(dev, master); 160 if (ret) { 161 drm_unset_busid(dev, master); 162 return ret; 163 } 164 } else { 165 WARN_ON(!dev->unique); 166 master->unique = kstrdup(dev->unique, GFP_KERNEL); 167 if (master->unique) 168 master->unique_len = strlen(dev->unique); 169 } 170 171 return 0; 172 } 173 174 /* 175 * Get client information. 176 * 177 * \param inode device inode. 178 * \param file_priv DRM file private. 179 * \param cmd command. 180 * \param arg user argument, pointing to a drm_client structure. 181 * 182 * \return zero on success or a negative number on failure. 183 * 184 * Searches for the client with the specified index and copies its information 185 * into userspace 186 */ 187 int drm_getclient(struct drm_device *dev, void *data, 188 struct drm_file *file_priv) 189 { 190 struct drm_client *client = data; 191 192 /* 193 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 194 * not breaking completely. Userspace tools stop enumerating one they 195 * get -EINVAL, hence this is the return value we need to hand back for 196 * no clients tracked. 197 * 198 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 199 * attempt to figure out whether they're authenticated or not. Since 200 * that's the only thing they care about, give it to the directly 201 * instead of walking one giant list. 202 */ 203 if (client->idx == 0) { 204 client->auth = file_priv->authenticated; 205 #ifdef __NetBSD__ /* XXX Too scary to contemplate. */ 206 client->pid = curproc->p_pid; 207 client->uid = kauth_cred_geteuid(curproc->p_cred); 208 #else 209 client->pid = task_pid_vnr(current); 210 client->uid = overflowuid; 211 #endif 212 client->magic = 0; 213 client->iocs = 0; 214 215 return 0; 216 } else { 217 return -EINVAL; 218 } 219 } 220 221 /* 222 * Get statistics information. 223 * 224 * \param inode device inode. 225 * \param file_priv DRM file private. 226 * \param cmd command. 227 * \param arg user argument, pointing to a drm_stats structure. 228 * 229 * \return zero on success or a negative number on failure. 230 */ 231 static int drm_getstats(struct drm_device *dev, void *data, 232 struct drm_file *file_priv) 233 { 234 struct drm_stats *stats = data; 235 236 /* Clear stats to prevent userspace from eating its stack garbage. */ 237 memset(stats, 0, sizeof(*stats)); 238 239 return 0; 240 } 241 242 /* 243 * Get device/driver capabilities 244 */ 245 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 246 { 247 struct drm_get_cap *req = data; 248 struct drm_crtc *crtc; 249 250 req->value = 0; 251 252 /* Only some caps make sense with UMS/render-only drivers. */ 253 switch (req->capability) { 254 case DRM_CAP_TIMESTAMP_MONOTONIC: 255 req->value = 1; 256 return 0; 257 case DRM_CAP_PRIME: 258 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 259 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 260 return 0; 261 case DRM_CAP_SYNCOBJ: 262 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ); 263 return 0; 264 case DRM_CAP_SYNCOBJ_TIMELINE: 265 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE); 266 return 0; 267 } 268 269 /* Other caps only work with KMS drivers */ 270 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 271 return -EOPNOTSUPP; 272 273 switch (req->capability) { 274 case DRM_CAP_DUMB_BUFFER: 275 if (dev->driver->dumb_create) 276 req->value = 1; 277 break; 278 case DRM_CAP_VBLANK_HIGH_CRTC: 279 req->value = 1; 280 break; 281 case DRM_CAP_DUMB_PREFERRED_DEPTH: 282 req->value = dev->mode_config.preferred_depth; 283 break; 284 case DRM_CAP_DUMB_PREFER_SHADOW: 285 req->value = dev->mode_config.prefer_shadow; 286 break; 287 case DRM_CAP_ASYNC_PAGE_FLIP: 288 req->value = dev->mode_config.async_page_flip; 289 break; 290 case DRM_CAP_PAGE_FLIP_TARGET: 291 req->value = 1; 292 drm_for_each_crtc(crtc, dev) { 293 if (!crtc->funcs->page_flip_target) 294 req->value = 0; 295 } 296 break; 297 case DRM_CAP_CURSOR_WIDTH: 298 if (dev->mode_config.cursor_width) 299 req->value = dev->mode_config.cursor_width; 300 else 301 req->value = 64; 302 break; 303 case DRM_CAP_CURSOR_HEIGHT: 304 if (dev->mode_config.cursor_height) 305 req->value = dev->mode_config.cursor_height; 306 else 307 req->value = 64; 308 break; 309 case DRM_CAP_ADDFB2_MODIFIERS: 310 req->value = dev->mode_config.allow_fb_modifiers; 311 break; 312 case DRM_CAP_CRTC_IN_VBLANK_EVENT: 313 req->value = 1; 314 break; 315 default: 316 return -EINVAL; 317 } 318 return 0; 319 } 320 321 /* 322 * Set device/driver capabilities 323 */ 324 static int 325 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 326 { 327 struct drm_set_client_cap *req = data; 328 329 /* No render-only settable capabilities for now */ 330 331 /* Below caps that only works with KMS drivers */ 332 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 333 return -EOPNOTSUPP; 334 335 switch (req->capability) { 336 case DRM_CLIENT_CAP_STEREO_3D: 337 if (req->value > 1) 338 return -EINVAL; 339 file_priv->stereo_allowed = req->value; 340 break; 341 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 342 if (req->value > 1) 343 return -EINVAL; 344 file_priv->universal_planes = req->value; 345 break; 346 case DRM_CLIENT_CAP_ATOMIC: 347 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 348 return -EOPNOTSUPP; 349 /* The modesetting DDX has a totally broken idea of atomic. */ 350 if (current->comm[0] == 'X' && req->value == 1) { 351 pr_info("broken atomic modeset userspace detected, disabling atomic\n"); 352 return -EOPNOTSUPP; 353 } 354 if (req->value > 2) 355 return -EINVAL; 356 file_priv->atomic = req->value; 357 file_priv->universal_planes = req->value; 358 /* 359 * No atomic user-space blows up on aspect ratio mode bits. 360 */ 361 file_priv->aspect_ratio_allowed = req->value; 362 break; 363 case DRM_CLIENT_CAP_ASPECT_RATIO: 364 if (req->value > 1) 365 return -EINVAL; 366 file_priv->aspect_ratio_allowed = req->value; 367 break; 368 case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS: 369 if (!file_priv->atomic) 370 return -EINVAL; 371 if (req->value > 1) 372 return -EINVAL; 373 file_priv->writeback_connectors = req->value; 374 break; 375 default: 376 return -EINVAL; 377 } 378 379 return 0; 380 } 381 382 /* 383 * Setversion ioctl. 384 * 385 * \param inode device inode. 386 * \param file_priv DRM file private. 387 * \param cmd command. 388 * \param arg user argument, pointing to a drm_lock structure. 389 * \return zero on success or negative number on failure. 390 * 391 * Sets the requested interface version 392 */ 393 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 394 { 395 struct drm_set_version *sv = data; 396 int if_version, retcode = 0; 397 398 mutex_lock(&dev->master_mutex); 399 if (sv->drm_di_major != -1) { 400 if (sv->drm_di_major != DRM_IF_MAJOR || 401 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 402 retcode = -EINVAL; 403 goto done; 404 } 405 if_version = DRM_IF_VERSION(sv->drm_di_major, 406 sv->drm_di_minor); 407 dev->if_version = max(if_version, dev->if_version); 408 if (sv->drm_di_minor >= 1) { 409 /* 410 * Version 1.1 includes tying of DRM to specific device 411 * Version 1.4 has proper PCI domain support 412 */ 413 retcode = drm_set_busid(dev, file_priv); 414 if (retcode) 415 goto done; 416 } 417 } 418 419 if (sv->drm_dd_major != -1) { 420 if (sv->drm_dd_major != dev->driver->major || 421 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 422 dev->driver->minor) { 423 retcode = -EINVAL; 424 goto done; 425 } 426 } 427 428 done: 429 sv->drm_di_major = DRM_IF_MAJOR; 430 sv->drm_di_minor = DRM_IF_MINOR; 431 sv->drm_dd_major = dev->driver->major; 432 sv->drm_dd_minor = dev->driver->minor; 433 mutex_unlock(&dev->master_mutex); 434 435 return retcode; 436 } 437 438 /** 439 * drm_noop - DRM no-op ioctl implemntation 440 * @dev: DRM device for the ioctl 441 * @data: data pointer for the ioctl 442 * @file_priv: DRM file for the ioctl call 443 * 444 * This no-op implementation for drm ioctls is useful for deprecated 445 * functionality where we can't return a failure code because existing userspace 446 * checks the result of the ioctl, but doesn't care about the action. 447 * 448 * Always returns successfully with 0. 449 */ 450 int drm_noop(struct drm_device *dev, void *data, 451 struct drm_file *file_priv) 452 { 453 DRM_DEBUG("\n"); 454 return 0; 455 } 456 EXPORT_SYMBOL(drm_noop); 457 458 /** 459 * drm_invalid_op - DRM invalid ioctl implemntation 460 * @dev: DRM device for the ioctl 461 * @data: data pointer for the ioctl 462 * @file_priv: DRM file for the ioctl call 463 * 464 * This no-op implementation for drm ioctls is useful for deprecated 465 * functionality where we really don't want to allow userspace to call the ioctl 466 * any more. This is the case for old ums interfaces for drivers that 467 * transitioned to kms gradually and so kept the old legacy tables around. This 468 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 469 * use this function. 470 * 471 * Always fails with a return value of -EINVAL. 472 */ 473 int drm_invalid_op(struct drm_device *dev, void *data, 474 struct drm_file *file_priv) 475 { 476 return -EINVAL; 477 } 478 EXPORT_SYMBOL(drm_invalid_op); 479 480 /* 481 * Copy and IOCTL return string to user space 482 */ 483 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 484 { 485 int len; 486 487 /* don't overflow userbuf */ 488 len = strlen(value); 489 if (len > *buf_len) 490 len = *buf_len; 491 492 /* let userspace know exact length of driver value (which could be 493 * larger than the userspace-supplied buffer) */ 494 *buf_len = strlen(value); 495 496 /* finally, try filling in the userbuf */ 497 if (len && buf) 498 if (copy_to_user(buf, value, len)) 499 return -EFAULT; 500 return 0; 501 } 502 503 /* 504 * Get version information 505 * 506 * \param inode device inode. 507 * \param filp file pointer. 508 * \param cmd command. 509 * \param arg user argument, pointing to a drm_version structure. 510 * \return zero on success or negative number on failure. 511 * 512 * Fills in the version information in \p arg. 513 */ 514 int drm_version(struct drm_device *dev, void *data, 515 struct drm_file *file_priv) 516 { 517 struct drm_version *version = data; 518 int err; 519 520 version->version_major = dev->driver->major; 521 version->version_minor = dev->driver->minor; 522 version->version_patchlevel = dev->driver->patchlevel; 523 err = drm_copy_field(version->name, &version->name_len, 524 dev->driver->name); 525 if (!err) 526 err = drm_copy_field(version->date, &version->date_len, 527 dev->driver->date); 528 if (!err) 529 err = drm_copy_field(version->desc, &version->desc_len, 530 dev->driver->desc); 531 532 return err; 533 } 534 535 /** 536 * drm_ioctl_permit - Check ioctl permissions against caller 537 * 538 * @flags: ioctl permission flags. 539 * @file_priv: Pointer to struct drm_file identifying the caller. 540 * 541 * Checks whether the caller is allowed to run an ioctl with the 542 * indicated permissions. 543 * 544 * Returns: 545 * Zero if allowed, -EACCES otherwise. 546 */ 547 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 548 { 549 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 550 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 551 return -EACCES; 552 553 /* AUTH is only for authenticated or render client */ 554 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 555 !file_priv->authenticated)) 556 return -EACCES; 557 558 /* MASTER is only for master or control clients */ 559 if (unlikely((flags & DRM_MASTER) && 560 !drm_is_current_master(file_priv))) 561 return -EACCES; 562 563 /* Render clients must be explicitly allowed */ 564 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 565 drm_is_render_client(file_priv))) 566 return -EACCES; 567 568 return 0; 569 } 570 EXPORT_SYMBOL(drm_ioctl_permit); 571 572 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 573 [DRM_IOCTL_NR(ioctl)] = { \ 574 .cmd = ioctl, \ 575 .func = _func, \ 576 .flags = _flags, \ 577 .name = #ioctl \ 578 } 579 580 #if IS_ENABLED(CONFIG_DRM_LEGACY) 581 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags) 582 #else 583 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags) 584 #endif 585 586 /* Ioctl table */ 587 static const struct drm_ioctl_desc drm_ioctls[] = { 588 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW), 589 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 590 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 591 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 592 593 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0), 594 595 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 596 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 597 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW), 598 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 599 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 600 601 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 602 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 603 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 604 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_MASTER), 605 606 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 607 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 608 609 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 610 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 611 612 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 613 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 614 615 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 616 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 617 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 618 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 619 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 620 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 621 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 622 623 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 624 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 625 626 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 627 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 628 629 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 630 631 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 632 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 633 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 634 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 635 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 636 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 637 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 638 639 #if IS_ENABLED(CONFIG_AGP) 640 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 641 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 642 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 643 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 644 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 645 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 646 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 647 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 648 #endif 649 650 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 651 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 652 653 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED), 654 655 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0), 656 657 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 658 659 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW), 660 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH), 661 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH), 662 663 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0), 664 665 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW), 666 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW), 667 668 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0), 669 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0), 670 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER), 671 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0), 672 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER), 673 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER), 674 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0), 675 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER), 676 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0), 677 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0), 678 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER), 679 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER), 680 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0), 681 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER), 682 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0), 683 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0), 684 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0), 685 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0), 686 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0), 687 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER), 688 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER), 689 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0), 690 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0), 691 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0), 692 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0), 693 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER), 694 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER), 695 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER), 696 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0), 697 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0), 698 699 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl, 700 DRM_RENDER_ALLOW), 701 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl, 702 DRM_RENDER_ALLOW), 703 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl, 704 DRM_RENDER_ALLOW), 705 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl, 706 DRM_RENDER_ALLOW), 707 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl, 708 DRM_RENDER_ALLOW), 709 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl, 710 DRM_RENDER_ALLOW), 711 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl, 712 DRM_RENDER_ALLOW), 713 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, 714 DRM_RENDER_ALLOW), 715 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, 716 DRM_RENDER_ALLOW), 717 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl, 718 DRM_RENDER_ALLOW), 719 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl, 720 DRM_RENDER_ALLOW), 721 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0), 722 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0), 723 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER), 724 DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER), 725 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER), 726 DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER), 727 }; 728 729 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 730 731 /** 732 * DOC: driver specific ioctls 733 * 734 * First things first, driver private IOCTLs should only be needed for drivers 735 * supporting rendering. Kernel modesetting is all standardized, and extended 736 * through properties. There are a few exceptions in some existing drivers, 737 * which define IOCTL for use by the display DRM master, but they all predate 738 * properties. 739 * 740 * Now if you do have a render driver you always have to support it through 741 * driver private properties. There's a few steps needed to wire all the things 742 * up. 743 * 744 * First you need to define the structure for your IOCTL in your driver private 745 * UAPI header in ``include/uapi/drm/my_driver_drm.h``:: 746 * 747 * struct my_driver_operation { 748 * u32 some_thing; 749 * u32 another_thing; 750 * }; 751 * 752 * Please make sure that you follow all the best practices from 753 * ``Documentation/ioctl/botching-up-ioctls.rst``. Note that drm_ioctl() 754 * automatically zero-extends structures, hence make sure you can add more stuff 755 * at the end, i.e. don't put a variable sized array there. 756 * 757 * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(), 758 * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix:: 759 * 760 * ##define DRM_IOCTL_MY_DRIVER_OPERATION \ 761 * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation) 762 * 763 * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to 764 * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire 765 * up the handlers and set the access rights:: 766 * 767 * static const struct drm_ioctl_desc my_driver_ioctls[] = { 768 * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation, 769 * DRM_AUTH|DRM_RENDER_ALLOW), 770 * }; 771 * 772 * And then assign this to the &drm_driver.ioctls field in your driver 773 * structure. 774 * 775 * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how 776 * the driver-specific IOCTLs are wired up. 777 */ 778 779 long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata, 780 u32 flags) 781 { 782 struct drm_file *file_priv = file->private_data; 783 struct drm_device *dev = file_priv->minor->dev; 784 int retcode; 785 786 if (drm_dev_is_unplugged(dev)) 787 return -ENODEV; 788 789 retcode = drm_ioctl_permit(flags, file_priv); 790 if (unlikely(retcode)) 791 return retcode; 792 793 /* Enforce sane locking for modern driver ioctls. */ 794 if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) || 795 (flags & DRM_UNLOCKED)) 796 retcode = func(dev, kdata, file_priv); 797 else { 798 mutex_lock(&drm_global_mutex); 799 retcode = func(dev, kdata, file_priv); 800 mutex_unlock(&drm_global_mutex); 801 } 802 return retcode; 803 } 804 EXPORT_SYMBOL(drm_ioctl_kernel); 805 806 /** 807 * drm_ioctl - ioctl callback implementation for DRM drivers 808 * @filp: file this ioctl is called on 809 * @cmd: ioctl cmd number 810 * @arg: user argument 811 * 812 * Looks up the ioctl function in the DRM core and the driver dispatch table, 813 * stored in &drm_driver.ioctls. It checks for necessary permission by calling 814 * drm_ioctl_permit(), and dispatches to the respective function. 815 * 816 * Returns: 817 * Zero on success, negative error code on failure. 818 */ 819 #ifdef __NetBSD__ 820 #include <sys/file.h> 821 int 822 drm_ioctl(struct file *fp, unsigned long cmd, void *data) 823 { 824 char stackbuf[128]; 825 char *buf = stackbuf; 826 void *data0 = data; 827 struct drm_file *const file = fp->f_data; 828 const unsigned int nr = DRM_IOCTL_NR(cmd); 829 int error; 830 831 switch (cmd) { 832 case FIONBIO: 833 case FIOASYNC: 834 return 0; 835 default: 836 break; 837 } 838 839 if (IOCGROUP(cmd) != DRM_IOCTL_BASE) 840 return EINVAL; 841 842 KASSERT(file != NULL); 843 KASSERT(file->minor != NULL); 844 KASSERT(file->minor->dev != NULL); 845 struct drm_device *const dev = file->minor->dev; 846 const struct drm_ioctl_desc *ioctl; 847 848 if (drm_device_is_unplugged(dev)) 849 return ENXIO; 850 851 const bool is_driver_ioctl = 852 (DRM_COMMAND_BASE <= nr) && (nr < DRM_COMMAND_END); 853 854 if (is_driver_ioctl) { 855 const unsigned int driver_nr = nr - DRM_COMMAND_BASE; 856 if (driver_nr >= dev->driver->num_ioctls) 857 return EINVAL; 858 ioctl = &dev->driver->ioctls[driver_nr]; 859 } else if (nr < __arraycount(drm_ioctls)) { 860 ioctl = &drm_ioctls[nr]; 861 } else { 862 ioctl = NULL; 863 } 864 865 if ((ioctl == NULL) || (ioctl->func == NULL)) 866 return EINVAL; 867 868 /* XXX errno Linux->NetBSD */ 869 error = -drm_ioctl_permit(ioctl->flags, file); 870 if (error) 871 return error; 872 873 /* If userland passed in too few bytes, zero-pad them. */ 874 if (IOCPARM_LEN(cmd) < IOCPARM_LEN(ioctl->cmd)) { 875 /* 12-bit quantity, according to <sys/ioccom.h> */ 876 KASSERT(IOCPARM_LEN(ioctl->cmd) <= 4096); 877 if (IOCPARM_LEN(ioctl->cmd) > sizeof stackbuf) { 878 buf = kmem_alloc(IOCPARM_LEN(ioctl->cmd), KM_NOSLEEP); 879 if (buf == NULL) 880 return ENOMEM; 881 } 882 memcpy(buf, data, IOCPARM_LEN(cmd)); 883 memset(buf + IOCPARM_LEN(cmd), 0, 884 IOCPARM_LEN(ioctl->cmd) - IOCPARM_LEN(cmd)); 885 data0 = buf; 886 } 887 888 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || 889 ISSET(ioctl->flags, DRM_UNLOCKED)) { 890 /* XXX errno Linux->NetBSD */ 891 error = -(*ioctl->func)(dev, data0, file); 892 } else { 893 mutex_lock(&drm_global_mutex); 894 /* XXX errno Linux->NetBSD */ 895 error = -(*ioctl->func)(dev, data0, file); 896 mutex_unlock(&drm_global_mutex); 897 } 898 899 /* If we used a temporary buffer, copy it back out. */ 900 if (data != data0) 901 memcpy(data, data0, IOCPARM_LEN(cmd)); 902 903 /* If we had to allocate a heap buffer, free it. */ 904 if (buf != stackbuf) 905 kmem_free(buf, IOCPARM_LEN(ioctl->cmd)); 906 907 return error; 908 } 909 #else 910 long drm_ioctl(struct file *filp, 911 unsigned int cmd, unsigned long arg) 912 { 913 struct drm_file *file_priv = filp->private_data; 914 struct drm_device *dev; 915 const struct drm_ioctl_desc *ioctl = NULL; 916 drm_ioctl_t *func; 917 unsigned int nr = DRM_IOCTL_NR(cmd); 918 int retcode = -EINVAL; 919 char stack_kdata[128]; 920 char *kdata = NULL; 921 unsigned int in_size, out_size, drv_size, ksize; 922 bool is_driver_ioctl; 923 924 dev = file_priv->minor->dev; 925 926 if (drm_dev_is_unplugged(dev)) 927 return -ENODEV; 928 929 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 930 931 if (is_driver_ioctl) { 932 /* driver ioctl */ 933 unsigned int index = nr - DRM_COMMAND_BASE; 934 935 if (index >= dev->driver->num_ioctls) 936 goto err_i1; 937 index = array_index_nospec(index, dev->driver->num_ioctls); 938 ioctl = &dev->driver->ioctls[index]; 939 } else { 940 /* core ioctl */ 941 if (nr >= DRM_CORE_IOCTL_COUNT) 942 goto err_i1; 943 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 944 ioctl = &drm_ioctls[nr]; 945 } 946 947 drv_size = _IOC_SIZE(ioctl->cmd); 948 out_size = in_size = _IOC_SIZE(cmd); 949 if ((cmd & ioctl->cmd & IOC_IN) == 0) 950 in_size = 0; 951 if ((cmd & ioctl->cmd & IOC_OUT) == 0) 952 out_size = 0; 953 ksize = max(max(in_size, out_size), drv_size); 954 955 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 956 task_pid_nr(current), 957 (long)old_encode_dev(file_priv->minor->kdev->devt), 958 file_priv->authenticated, ioctl->name); 959 960 /* Do not trust userspace, use our own definition */ 961 func = ioctl->func; 962 963 if (unlikely(!func)) { 964 DRM_DEBUG("no function\n"); 965 retcode = -EINVAL; 966 goto err_i1; 967 } 968 969 if (ksize <= sizeof(stack_kdata)) { 970 kdata = stack_kdata; 971 } else { 972 kdata = kmalloc(ksize, GFP_KERNEL); 973 if (!kdata) { 974 retcode = -ENOMEM; 975 goto err_i1; 976 } 977 } 978 979 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { 980 retcode = -EFAULT; 981 goto err_i1; 982 } 983 984 if (ksize > in_size) 985 memset(kdata + in_size, 0, ksize - in_size); 986 987 retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags); 988 if (copy_to_user((void __user *)arg, kdata, out_size) != 0) 989 retcode = -EFAULT; 990 991 err_i1: 992 if (!ioctl) 993 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 994 task_pid_nr(current), 995 (long)old_encode_dev(file_priv->minor->kdev->devt), 996 file_priv->authenticated, cmd, nr); 997 998 if (kdata != stack_kdata) 999 kfree(kdata); 1000 if (retcode) 1001 DRM_DEBUG("pid=%d, ret = %d\n", task_pid_nr(current), retcode); 1002 return retcode; 1003 } 1004 #endif 1005 EXPORT_SYMBOL(drm_ioctl); 1006 1007 /** 1008 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 1009 * @nr: ioctl number 1010 * @flags: where to return the ioctl permission flags 1011 * 1012 * This ioctl is only used by the vmwgfx driver to augment the access checks 1013 * done by the drm core and insofar a pretty decent layering violation. This 1014 * shouldn't be used by any drivers. 1015 * 1016 * Returns: 1017 * True if the @nr corresponds to a DRM core ioctl number, false otherwise. 1018 */ 1019 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 1020 { 1021 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 1022 return false; 1023 1024 if (nr >= DRM_CORE_IOCTL_COUNT) 1025 return false; 1026 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 1027 1028 *flags = drm_ioctls[nr].flags; 1029 return true; 1030 } 1031 EXPORT_SYMBOL(drm_ioctl_flags); 1032
Indexes created Thu Oct 16 14:10:15 GMT 2025