1 /* $NetBSD: drm_ioctl.c,v 1.25 2024/04/21 03:02:51 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 1.25 2024/04/21 03:02:51 riastradh Exp $"); 35 36 #include <linux/export.h> 37 #include <linux/nospec.h> 38 #include <linux/pci.h> 39 #include <linux/uaccess.h> 40 #include <linux/capability.h> 41 42 #ifdef __NetBSD__ 43 #include <sys/types.h> 44 #include <sys/file.h> 45 #endif 46 47 #include <drm/drm_agpsupport.h> 48 #include <drm/drm_auth.h> 49 #include <drm/drm_crtc.h> 50 #include <drm/drm_drv.h> 51 #include <drm/drm_file.h> 52 #include <drm/drm_ioctl.h> 53 #include <drm/drm_print.h> 54 55 #include "drm_crtc_internal.h" 56 #include "drm_internal.h" 57 #include "drm_legacy.h" 58 59 /** 60 * DOC: getunique and setversion story 61 * 62 * BEWARE THE DRAGONS! MIND THE TRAPDOORS! 63 * 64 * In an attempt to warn anyone else who's trying to figure out what's going 65 * on here, I'll try to summarize the story. First things first, let's clear up 66 * the names, because the kernel internals, libdrm and the ioctls are all named 67 * differently: 68 * 69 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm 70 * through the drmGetBusid function. 71 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All 72 * that code is nerved in the kernel with drm_invalid_op(). 73 * - The internal set_busid kernel functions and driver callbacks are 74 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is 75 * nerved) allowed userspace to set the busid through the above ioctl. 76 * - Other ioctls and functions involved are named consistently. 77 * 78 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly 79 * handling pci domains in the busid on ppc. Doing this correctly was only 80 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's 81 * special with drm 1.2 and 1.3. 82 * 83 * Now the actual horror story of how device lookup in drm works. At large, 84 * there's 2 different ways, either by busid, or by device driver name. 85 * 86 * Opening by busid is fairly simple: 87 * 88 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a 89 * side-effect this fills out the unique name in the master structure. 90 * 2. Call GET_UNIQUE to read out the unique name from the master structure, 91 * which matches the busid thanks to step 1. If it doesn't, proceed to try 92 * the next device node. 93 * 94 * Opening by name is slightly different: 95 * 96 * 1. Directly call VERSION to get the version and to match against the driver 97 * name returned by that ioctl. Note that SET_VERSION is not called, which 98 * means the the unique name for the master node just opening is _not_ filled 99 * out. This despite that with current drm device nodes are always bound to 100 * one device, and can't be runtime assigned like with drm 1.0. 101 * 2. Match driver name. If it mismatches, proceed to the next device node. 102 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by 103 * checking that the first byte in the string is 0). If that's not the case 104 * libdrm skips and proceeds to the next device node. Probably this is just 105 * copypasta from drm 1.0 times where a set unique name meant that the driver 106 * was in use already, but that's just conjecture. 107 * 108 * Long story short: To keep the open by name logic working, GET_UNIQUE must 109 * _not_ return a unique string when SET_VERSION hasn't been called yet, 110 * otherwise libdrm breaks. Even when that unique string can't ever change, and 111 * is totally irrelevant for actually opening the device because runtime 112 * assignable device instances were only support in drm 1.0, which is long dead. 113 * But the libdrm code in drmOpenByName somehow survived, hence this can't be 114 * broken. 115 */ 116 117 /* 118 * Get the bus id. 119 * 120 * \param inode device inode. 121 * \param file_priv DRM file private. 122 * \param cmd command. 123 * \param arg user argument, pointing to a drm_unique structure. 124 * \return zero on success or a negative number on failure. 125 * 126 * Copies the bus id from drm_device::unique into user space. 127 */ 128 int drm_getunique(struct drm_device *dev, void *data, 129 struct drm_file *file_priv) 130 { 131 struct drm_unique *u = data; 132 struct drm_master *master; 133 int ret; 134 135 mutex_lock(&dev->master_mutex); 136 master = dev->master; 137 if (master == NULL) { 138 ret = -ENXIO; 139 goto out; 140 } 141 142 /* 143 * Copy out only if the user allocated enough space. Either 144 * way, on success, report the actual size -- so the user can 145 * allocate enough space if they didn't before, or so they know 146 * exactly how much we copied out. 147 */ 148 if (u->unique_len < master->unique_len) { 149 ret = 0; 150 } else { 151 ret = copy_to_user(u->unique, master->unique, 152 master->unique_len); 153 if (ret) 154 goto out; 155 } 156 u->unique_len = master->unique_len; 157 158 out: mutex_unlock(&dev->master_mutex); 159 160 return ret; 161 } 162 163 static void 164 drm_unset_busid(struct drm_device *dev, 165 struct drm_master *master) 166 { 167 kfree(master->unique); 168 master->unique = NULL; 169 master->unique_len = 0; 170 } 171 172 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 173 { 174 struct drm_master *master = file_priv->master; 175 int ret; 176 177 if (master->unique != NULL) 178 drm_unset_busid(dev, master); 179 180 if (dev->dev && dev_is_pci(dev->dev)) { 181 ret = drm_pci_set_busid(dev, master); 182 if (ret) { 183 drm_unset_busid(dev, master); 184 return ret; 185 } 186 } else { 187 WARN_ON(!dev->unique); 188 master->unique = kstrdup(dev->unique, GFP_KERNEL); 189 if (master->unique) 190 master->unique_len = strlen(dev->unique); 191 } 192 193 return 0; 194 } 195 196 /* 197 * Get client information. 198 * 199 * \param inode device inode. 200 * \param file_priv DRM file private. 201 * \param cmd command. 202 * \param arg user argument, pointing to a drm_client structure. 203 * 204 * \return zero on success or a negative number on failure. 205 * 206 * Searches for the client with the specified index and copies its information 207 * into userspace 208 */ 209 int drm_getclient(struct drm_device *dev, void *data, 210 struct drm_file *file_priv) 211 { 212 struct drm_client *client = data; 213 214 /* 215 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 216 * not breaking completely. Userspace tools stop enumerating one they 217 * get -EINVAL, hence this is the return value we need to hand back for 218 * no clients tracked. 219 * 220 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 221 * attempt to figure out whether they're authenticated or not. Since 222 * that's the only thing they care about, give it to the directly 223 * instead of walking one giant list. 224 */ 225 if (client->idx == 0) { 226 client->auth = file_priv->authenticated; 227 #ifdef __NetBSD__ /* XXX Too scary to contemplate. */ 228 client->pid = curproc->p_pid; 229 client->uid = kauth_cred_geteuid(curproc->p_cred); 230 #else 231 client->pid = task_pid_vnr(current); 232 client->uid = overflowuid; 233 #endif 234 client->magic = 0; 235 client->iocs = 0; 236 237 return 0; 238 } else { 239 return -EINVAL; 240 } 241 } 242 243 /* 244 * Get statistics information. 245 * 246 * \param inode device inode. 247 * \param file_priv DRM file private. 248 * \param cmd command. 249 * \param arg user argument, pointing to a drm_stats structure. 250 * 251 * \return zero on success or a negative number on failure. 252 */ 253 static int drm_getstats(struct drm_device *dev, void *data, 254 struct drm_file *file_priv) 255 { 256 struct drm_stats *stats = data; 257 258 /* Clear stats to prevent userspace from eating its stack garbage. */ 259 memset(stats, 0, sizeof(*stats)); 260 261 return 0; 262 } 263 264 /* 265 * Get device/driver capabilities 266 */ 267 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 268 { 269 struct drm_get_cap *req = data; 270 struct drm_crtc *crtc; 271 272 req->value = 0; 273 274 /* Only some caps make sense with UMS/render-only drivers. */ 275 switch (req->capability) { 276 case DRM_CAP_TIMESTAMP_MONOTONIC: 277 req->value = 1; 278 return 0; 279 case DRM_CAP_PRIME: 280 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 281 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 282 return 0; 283 case DRM_CAP_SYNCOBJ: 284 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ); 285 return 0; 286 case DRM_CAP_SYNCOBJ_TIMELINE: 287 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE); 288 return 0; 289 } 290 291 /* Other caps only work with KMS drivers */ 292 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 293 return -EOPNOTSUPP; 294 295 switch (req->capability) { 296 case DRM_CAP_DUMB_BUFFER: 297 if (dev->driver->dumb_create) 298 req->value = 1; 299 break; 300 case DRM_CAP_VBLANK_HIGH_CRTC: 301 req->value = 1; 302 break; 303 case DRM_CAP_DUMB_PREFERRED_DEPTH: 304 req->value = dev->mode_config.preferred_depth; 305 break; 306 case DRM_CAP_DUMB_PREFER_SHADOW: 307 req->value = dev->mode_config.prefer_shadow; 308 break; 309 case DRM_CAP_ASYNC_PAGE_FLIP: 310 req->value = dev->mode_config.async_page_flip; 311 break; 312 case DRM_CAP_PAGE_FLIP_TARGET: 313 req->value = 1; 314 drm_for_each_crtc(crtc, dev) { 315 if (!crtc->funcs->page_flip_target) 316 req->value = 0; 317 } 318 break; 319 case DRM_CAP_CURSOR_WIDTH: 320 if (dev->mode_config.cursor_width) 321 req->value = dev->mode_config.cursor_width; 322 else 323 req->value = 64; 324 break; 325 case DRM_CAP_CURSOR_HEIGHT: 326 if (dev->mode_config.cursor_height) 327 req->value = dev->mode_config.cursor_height; 328 else 329 req->value = 64; 330 break; 331 case DRM_CAP_ADDFB2_MODIFIERS: 332 req->value = dev->mode_config.allow_fb_modifiers; 333 break; 334 case DRM_CAP_CRTC_IN_VBLANK_EVENT: 335 req->value = 1; 336 break; 337 default: 338 return -EINVAL; 339 } 340 return 0; 341 } 342 343 /* 344 * Set device/driver capabilities 345 */ 346 static int 347 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 348 { 349 struct drm_set_client_cap *req = data; 350 351 /* No render-only settable capabilities for now */ 352 353 /* Below caps that only works with KMS drivers */ 354 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 355 return -EOPNOTSUPP; 356 357 switch (req->capability) { 358 case DRM_CLIENT_CAP_STEREO_3D: 359 if (req->value > 1) 360 return -EINVAL; 361 file_priv->stereo_allowed = req->value; 362 break; 363 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 364 if (req->value > 1) 365 return -EINVAL; 366 file_priv->universal_planes = req->value; 367 break; 368 case DRM_CLIENT_CAP_ATOMIC: 369 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 370 return -EOPNOTSUPP; 371 /* The modesetting DDX has a totally broken idea of atomic. */ 372 #ifdef __NetBSD__ 373 if (current->p_comm[0] == 'X' && req->value == 1) 374 #else 375 if (current->comm[0] == 'X' && req->value == 1) 376 #endif 377 { 378 pr_info("broken atomic modeset userspace detected, disabling atomic\n"); 379 return -EOPNOTSUPP; 380 } 381 if (req->value > 2) 382 return -EINVAL; 383 file_priv->atomic = req->value; 384 file_priv->universal_planes = req->value; 385 /* 386 * No atomic user-space blows up on aspect ratio mode bits. 387 */ 388 file_priv->aspect_ratio_allowed = req->value; 389 break; 390 case DRM_CLIENT_CAP_ASPECT_RATIO: 391 if (req->value > 1) 392 return -EINVAL; 393 file_priv->aspect_ratio_allowed = req->value; 394 break; 395 case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS: 396 if (!file_priv->atomic) 397 return -EINVAL; 398 if (req->value > 1) 399 return -EINVAL; 400 file_priv->writeback_connectors = req->value; 401 break; 402 default: 403 return -EINVAL; 404 } 405 406 return 0; 407 } 408 409 /* 410 * Setversion ioctl. 411 * 412 * \param inode device inode. 413 * \param file_priv DRM file private. 414 * \param cmd command. 415 * \param arg user argument, pointing to a drm_lock structure. 416 * \return zero on success or negative number on failure. 417 * 418 * Sets the requested interface version 419 */ 420 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 421 { 422 struct drm_set_version *sv = data; 423 int if_version, retcode = 0; 424 425 mutex_lock(&dev->master_mutex); 426 if (sv->drm_di_major != -1) { 427 if (sv->drm_di_major != DRM_IF_MAJOR || 428 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 429 retcode = -EINVAL; 430 goto done; 431 } 432 if_version = DRM_IF_VERSION(sv->drm_di_major, 433 sv->drm_di_minor); 434 dev->if_version = max(if_version, dev->if_version); 435 if (sv->drm_di_minor >= 1) { 436 /* 437 * Version 1.1 includes tying of DRM to specific device 438 * Version 1.4 has proper PCI domain support 439 */ 440 retcode = drm_set_busid(dev, file_priv); 441 if (retcode) 442 goto done; 443 } 444 } 445 446 if (sv->drm_dd_major != -1) { 447 if (sv->drm_dd_major != dev->driver->major || 448 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 449 dev->driver->minor) { 450 retcode = -EINVAL; 451 goto done; 452 } 453 } 454 455 done: 456 sv->drm_di_major = DRM_IF_MAJOR; 457 sv->drm_di_minor = DRM_IF_MINOR; 458 sv->drm_dd_major = dev->driver->major; 459 sv->drm_dd_minor = dev->driver->minor; 460 mutex_unlock(&dev->master_mutex); 461 462 return retcode; 463 } 464 465 /** 466 * drm_noop - DRM no-op ioctl implemntation 467 * @dev: DRM device for the ioctl 468 * @data: data pointer for the ioctl 469 * @file_priv: DRM file for the ioctl call 470 * 471 * This no-op implementation for drm ioctls is useful for deprecated 472 * functionality where we can't return a failure code because existing userspace 473 * checks the result of the ioctl, but doesn't care about the action. 474 * 475 * Always returns successfully with 0. 476 */ 477 int drm_noop(struct drm_device *dev, void *data, 478 struct drm_file *file_priv) 479 { 480 DRM_DEBUG("\n"); 481 return 0; 482 } 483 EXPORT_SYMBOL(drm_noop); 484 485 /** 486 * drm_invalid_op - DRM invalid ioctl implemntation 487 * @dev: DRM device for the ioctl 488 * @data: data pointer for the ioctl 489 * @file_priv: DRM file for the ioctl call 490 * 491 * This no-op implementation for drm ioctls is useful for deprecated 492 * functionality where we really don't want to allow userspace to call the ioctl 493 * any more. This is the case for old ums interfaces for drivers that 494 * transitioned to kms gradually and so kept the old legacy tables around. This 495 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 496 * use this function. 497 * 498 * Always fails with a return value of -EINVAL. 499 */ 500 int drm_invalid_op(struct drm_device *dev, void *data, 501 struct drm_file *file_priv) 502 { 503 return -EINVAL; 504 } 505 EXPORT_SYMBOL(drm_invalid_op); 506 507 /* 508 * Copy and IOCTL return string to user space 509 */ 510 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 511 { 512 int len; 513 514 /* don't overflow userbuf */ 515 len = strlen(value); 516 if (len > *buf_len) 517 len = *buf_len; 518 519 /* let userspace know exact length of driver value (which could be 520 * larger than the userspace-supplied buffer) */ 521 *buf_len = strlen(value); 522 523 /* finally, try filling in the userbuf */ 524 if (len && buf) 525 if (copy_to_user(buf, value, len)) 526 return -EFAULT; 527 return 0; 528 } 529 530 /* 531 * Get version information 532 * 533 * \param inode device inode. 534 * \param filp file pointer. 535 * \param cmd command. 536 * \param arg user argument, pointing to a drm_version structure. 537 * \return zero on success or negative number on failure. 538 * 539 * Fills in the version information in \p arg. 540 */ 541 int drm_version(struct drm_device *dev, void *data, 542 struct drm_file *file_priv) 543 { 544 struct drm_version *version = data; 545 int err; 546 547 version->version_major = dev->driver->major; 548 version->version_minor = dev->driver->minor; 549 version->version_patchlevel = dev->driver->patchlevel; 550 err = drm_copy_field(version->name, &version->name_len, 551 dev->driver->name); 552 if (!err) 553 err = drm_copy_field(version->date, &version->date_len, 554 dev->driver->date); 555 if (!err) 556 err = drm_copy_field(version->desc, &version->desc_len, 557 dev->driver->desc); 558 559 return err; 560 } 561 562 /** 563 * drm_ioctl_permit - Check ioctl permissions against caller 564 * 565 * @flags: ioctl permission flags. 566 * @file_priv: Pointer to struct drm_file identifying the caller. 567 * 568 * Checks whether the caller is allowed to run an ioctl with the 569 * indicated permissions. 570 * 571 * Returns: 572 * Zero if allowed, -EACCES otherwise. 573 */ 574 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 575 { 576 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 577 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 578 return -EACCES; 579 580 /* AUTH is only for authenticated or render client */ 581 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 582 !file_priv->authenticated)) 583 return -EACCES; 584 585 /* MASTER is only for master or control clients */ 586 if (unlikely((flags & DRM_MASTER) && 587 !drm_is_current_master(file_priv))) 588 return -EACCES; 589 590 /* Render clients must be explicitly allowed */ 591 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 592 drm_is_render_client(file_priv))) 593 return -EACCES; 594 595 return 0; 596 } 597 EXPORT_SYMBOL(drm_ioctl_permit); 598 599 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 600 [DRM_IOCTL_NR(ioctl)] = { \ 601 .cmd = ioctl, \ 602 .func = _func, \ 603 .flags = _flags, \ 604 .name = #ioctl \ 605 } 606 607 #if IS_ENABLED(CONFIG_DRM_LEGACY) 608 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags) 609 #else 610 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags) 611 #endif 612 613 /* Ioctl table */ 614 static const struct drm_ioctl_desc drm_ioctls[] = { 615 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW), 616 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, DRM_RENDER_ALLOW), 617 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 618 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 619 620 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0), 621 622 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 623 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 624 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW), 625 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 626 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 627 628 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 629 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 630 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 631 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_MASTER), 632 633 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 634 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 635 636 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 637 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 638 639 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 640 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 641 642 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 643 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 644 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 645 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 646 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 647 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 648 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 649 650 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 651 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 652 653 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 654 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 655 656 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 657 658 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 659 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 660 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 661 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 662 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 663 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 664 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 665 666 #if IS_ENABLED(CONFIG_AGP) 667 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 668 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 669 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 670 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 671 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 672 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 673 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 674 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 675 #endif 676 677 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 678 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 679 680 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED), 681 682 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0), 683 684 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 685 686 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW), 687 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH), 688 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH), 689 690 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0), 691 692 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW), 693 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW), 694 695 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0), 696 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0), 697 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER), 698 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0), 699 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER), 700 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER), 701 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0), 702 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER), 703 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0), 704 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0), 705 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER), 706 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER), 707 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0), 708 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER), 709 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0), 710 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0), 711 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0), 712 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0), 713 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0), 714 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER), 715 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER), 716 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0), 717 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0), 718 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0), 719 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0), 720 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER), 721 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER), 722 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER), 723 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0), 724 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0), 725 726 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl, 727 DRM_RENDER_ALLOW), 728 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl, 729 DRM_RENDER_ALLOW), 730 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl, 731 DRM_RENDER_ALLOW), 732 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl, 733 DRM_RENDER_ALLOW), 734 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl, 735 DRM_RENDER_ALLOW), 736 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl, 737 DRM_RENDER_ALLOW), 738 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl, 739 DRM_RENDER_ALLOW), 740 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, 741 DRM_RENDER_ALLOW), 742 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, 743 DRM_RENDER_ALLOW), 744 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl, 745 DRM_RENDER_ALLOW), 746 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl, 747 DRM_RENDER_ALLOW), 748 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0), 749 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0), 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 }; 755 756 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 757 758 #ifdef __NetBSD__ 759 /* ioctl suspend/resume */ 760 761 static void 762 drm_ioctl_enter(struct drm_device *dev) 763 { 764 int ret __diagused; 765 766 mutex_lock(&dev->suspend_lock); 767 DRM_WAIT_NOINTR_UNTIL(ret, &dev->suspend_cv, &dev->suspend_lock, 768 dev->suspender == NULL); 769 KASSERTMSG(ret == 0, "error=%d", -ret); 770 dev->active_ioctls++; 771 mutex_unlock(&dev->suspend_lock); 772 } 773 774 static void 775 drm_ioctl_exit(struct drm_device *dev) 776 { 777 778 mutex_lock(&dev->suspend_lock); 779 KASSERT(dev->suspender == NULL); 780 if (--dev->active_ioctls == 0) 781 DRM_WAKEUP_ALL(&dev->suspend_cv, &dev->suspend_lock); 782 mutex_unlock(&dev->suspend_lock); 783 } 784 785 void 786 drm_suspend_ioctl(struct drm_device *dev) 787 { 788 int ret; 789 790 mutex_lock(&dev->suspend_lock); 791 DRM_WAIT_NOINTR_UNTIL(ret, &dev->suspend_cv, &dev->suspend_lock, 792 dev->suspender == NULL && dev->active_ioctls == 0); 793 dev->suspender = curlwp; 794 mutex_unlock(&dev->suspend_lock); 795 } 796 797 void 798 drm_resume_ioctl(struct drm_device *dev) 799 { 800 801 mutex_lock(&dev->suspend_lock); 802 KASSERT(dev->suspender); 803 KASSERT(dev->active_ioctls == 0); 804 dev->suspender = NULL; 805 DRM_WAKEUP_ALL(&dev->suspend_cv, &dev->suspend_lock); 806 mutex_unlock(&dev->suspend_lock); 807 } 808 #endif 809 810 /** 811 * DOC: driver specific ioctls 812 * 813 * First things first, driver private IOCTLs should only be needed for drivers 814 * supporting rendering. Kernel modesetting is all standardized, and extended 815 * through properties. There are a few exceptions in some existing drivers, 816 * which define IOCTL for use by the display DRM master, but they all predate 817 * properties. 818 * 819 * Now if you do have a render driver you always have to support it through 820 * driver private properties. There's a few steps needed to wire all the things 821 * up. 822 * 823 * First you need to define the structure for your IOCTL in your driver private 824 * UAPI header in ``include/uapi/drm/my_driver_drm.h``:: 825 * 826 * struct my_driver_operation { 827 * u32 some_thing; 828 * u32 another_thing; 829 * }; 830 * 831 * Please make sure that you follow all the best practices from 832 * ``Documentation/ioctl/botching-up-ioctls.rst``. Note that drm_ioctl() 833 * automatically zero-extends structures, hence make sure you can add more stuff 834 * at the end, i.e. don't put a variable sized array there. 835 * 836 * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(), 837 * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix:: 838 * 839 * ##define DRM_IOCTL_MY_DRIVER_OPERATION \ 840 * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation) 841 * 842 * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to 843 * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire 844 * up the handlers and set the access rights:: 845 * 846 * static const struct drm_ioctl_desc my_driver_ioctls[] = { 847 * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation, 848 * DRM_AUTH|DRM_RENDER_ALLOW), 849 * }; 850 * 851 * And then assign this to the &drm_driver.ioctls field in your driver 852 * structure. 853 * 854 * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how 855 * the driver-specific IOCTLs are wired up. 856 */ 857 858 long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata, 859 u32 flags) 860 { 861 #ifdef __NetBSD__ 862 struct drm_file *file_priv = file->f_data; 863 #else 864 struct drm_file *file_priv = file->private_data; 865 #endif 866 struct drm_device *dev = file_priv->minor->dev; 867 int retcode; 868 869 if (drm_dev_is_unplugged(dev)) 870 return -ENODEV; 871 872 retcode = drm_ioctl_permit(flags, file_priv); 873 if (unlikely(retcode)) 874 return retcode; 875 876 drm_ioctl_enter(dev); 877 878 /* Enforce sane locking for modern driver ioctls. */ 879 if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) || 880 (flags & DRM_UNLOCKED)) 881 retcode = func(dev, kdata, file_priv); 882 else { 883 mutex_lock(&drm_global_mutex); 884 retcode = func(dev, kdata, file_priv); 885 mutex_unlock(&drm_global_mutex); 886 } 887 888 drm_ioctl_exit(dev); 889 890 return retcode; 891 } 892 EXPORT_SYMBOL(drm_ioctl_kernel); 893 894 /** 895 * drm_ioctl - ioctl callback implementation for DRM drivers 896 * @filp: file this ioctl is called on 897 * @cmd: ioctl cmd number 898 * @arg: user argument 899 * 900 * Looks up the ioctl function in the DRM core and the driver dispatch table, 901 * stored in &drm_driver.ioctls. It checks for necessary permission by calling 902 * drm_ioctl_permit(), and dispatches to the respective function. 903 * 904 * Returns: 905 * Zero on success, negative error code on failure. 906 */ 907 #ifdef __NetBSD__ 908 #include <sys/file.h> 909 int 910 drm_ioctl(struct file *fp, unsigned long cmd, void *data) 911 { 912 char stackbuf[128] __aligned(ALIGNBYTES + 1); 913 char *buf = stackbuf; 914 void *data0 = data; 915 struct drm_file *const file = fp->f_data; 916 const unsigned int nr = DRM_IOCTL_NR(cmd); 917 int error; 918 919 switch (cmd) { 920 case FIONBIO: 921 case FIOASYNC: 922 return 0; 923 default: 924 break; 925 } 926 927 if (IOCGROUP(cmd) != DRM_IOCTL_BASE) 928 return EINVAL; 929 930 KASSERT(file != NULL); 931 KASSERT(file->minor != NULL); 932 KASSERT(file->minor->dev != NULL); 933 struct drm_device *const dev = file->minor->dev; 934 const struct drm_ioctl_desc *ioctl; 935 936 if (drm_dev_is_unplugged(dev)) 937 return ENXIO; 938 939 const bool is_driver_ioctl = 940 (DRM_COMMAND_BASE <= nr) && (nr < DRM_COMMAND_END); 941 942 if (is_driver_ioctl) { 943 const unsigned int driver_nr = nr - DRM_COMMAND_BASE; 944 if (driver_nr >= dev->driver->num_ioctls) 945 return EINVAL; 946 ioctl = &dev->driver->ioctls[driver_nr]; 947 } else if (nr < __arraycount(drm_ioctls)) { 948 ioctl = &drm_ioctls[nr]; 949 } else { 950 ioctl = NULL; 951 } 952 953 if ((ioctl == NULL) || (ioctl->func == NULL)) 954 return EINVAL; 955 956 /* XXX errno Linux->NetBSD */ 957 error = -drm_ioctl_permit(ioctl->flags, file); 958 if (error) 959 return error; 960 961 /* If userland passed in too few bytes, zero-pad them. */ 962 if (IOCPARM_LEN(cmd) < IOCPARM_LEN(ioctl->cmd)) { 963 /* 12-bit quantity, according to <sys/ioccom.h> */ 964 KASSERT(IOCPARM_LEN(ioctl->cmd) <= 4096); 965 if (IOCPARM_LEN(ioctl->cmd) > sizeof stackbuf) { 966 buf = kmem_alloc(IOCPARM_LEN(ioctl->cmd), KM_NOSLEEP); 967 if (buf == NULL) 968 return ENOMEM; 969 } 970 memcpy(buf, data, IOCPARM_LEN(cmd)); 971 memset(buf + IOCPARM_LEN(cmd), 0, 972 IOCPARM_LEN(ioctl->cmd) - IOCPARM_LEN(cmd)); 973 data0 = buf; 974 } 975 976 drm_ioctl_enter(dev); 977 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || 978 ISSET(ioctl->flags, DRM_UNLOCKED)) { 979 /* XXX errno Linux->NetBSD */ 980 error = -(*ioctl->func)(dev, data0, file); 981 } else { 982 mutex_lock(&drm_global_mutex); 983 /* XXX errno Linux->NetBSD */ 984 error = -(*ioctl->func)(dev, data0, file); 985 mutex_unlock(&drm_global_mutex); 986 } 987 drm_ioctl_exit(dev); 988 989 /* If we used a temporary buffer, copy it back out. */ 990 if (data != data0) 991 memcpy(data, data0, IOCPARM_LEN(cmd)); 992 993 /* If we had to allocate a heap buffer, free it. */ 994 if (buf != stackbuf) 995 kmem_free(buf, IOCPARM_LEN(ioctl->cmd)); 996 997 return error; 998 } 999 #else 1000 long drm_ioctl(struct file *filp, 1001 unsigned int cmd, unsigned long arg) 1002 { 1003 struct drm_file *file_priv = filp->private_data; 1004 struct drm_device *dev; 1005 const struct drm_ioctl_desc *ioctl = NULL; 1006 drm_ioctl_t *func; 1007 unsigned int nr = DRM_IOCTL_NR(cmd); 1008 int retcode = -EINVAL; 1009 char stack_kdata[128]; 1010 char *kdata = NULL; 1011 unsigned int in_size, out_size, drv_size, ksize; 1012 bool is_driver_ioctl; 1013 1014 dev = file_priv->minor->dev; 1015 1016 if (drm_dev_is_unplugged(dev)) 1017 return -ENODEV; 1018 1019 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 1020 1021 if (is_driver_ioctl) { 1022 /* driver ioctl */ 1023 unsigned int index = nr - DRM_COMMAND_BASE; 1024 1025 if (index >= dev->driver->num_ioctls) 1026 goto err_i1; 1027 index = array_index_nospec(index, dev->driver->num_ioctls); 1028 ioctl = &dev->driver->ioctls[index]; 1029 } else { 1030 /* core ioctl */ 1031 if (nr >= DRM_CORE_IOCTL_COUNT) 1032 goto err_i1; 1033 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 1034 ioctl = &drm_ioctls[nr]; 1035 } 1036 1037 drv_size = _IOC_SIZE(ioctl->cmd); 1038 out_size = in_size = _IOC_SIZE(cmd); 1039 if ((cmd & ioctl->cmd & IOC_IN) == 0) 1040 in_size = 0; 1041 if ((cmd & ioctl->cmd & IOC_OUT) == 0) 1042 out_size = 0; 1043 ksize = max(max(in_size, out_size), drv_size); 1044 1045 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 1046 task_pid_nr(current), 1047 (long)old_encode_dev(file_priv->minor->kdev->devt), 1048 file_priv->authenticated, ioctl->name); 1049 1050 /* Do not trust userspace, use our own definition */ 1051 func = ioctl->func; 1052 1053 if (unlikely(!func)) { 1054 DRM_DEBUG("no function\n"); 1055 retcode = -EINVAL; 1056 goto err_i1; 1057 } 1058 1059 if (ksize <= sizeof(stack_kdata)) { 1060 kdata = stack_kdata; 1061 } else { 1062 kdata = kmalloc(ksize, GFP_KERNEL); 1063 if (!kdata) { 1064 retcode = -ENOMEM; 1065 goto err_i1; 1066 } 1067 } 1068 1069 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { 1070 retcode = -EFAULT; 1071 goto err_i1; 1072 } 1073 1074 if (ksize > in_size) 1075 memset(kdata + in_size, 0, ksize - in_size); 1076 1077 retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags); 1078 if (copy_to_user((void __user *)arg, kdata, out_size) != 0) 1079 retcode = -EFAULT; 1080 1081 err_i1: 1082 if (!ioctl) 1083 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 1084 task_pid_nr(current), 1085 (long)old_encode_dev(file_priv->minor->kdev->devt), 1086 file_priv->authenticated, cmd, nr); 1087 1088 if (kdata != stack_kdata) 1089 kfree(kdata); 1090 if (retcode) 1091 DRM_DEBUG("pid=%d, ret = %d\n", task_pid_nr(current), retcode); 1092 return retcode; 1093 } 1094 #endif 1095 EXPORT_SYMBOL(drm_ioctl); 1096 1097 /** 1098 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 1099 * @nr: ioctl number 1100 * @flags: where to return the ioctl permission flags 1101 * 1102 * This ioctl is only used by the vmwgfx driver to augment the access checks 1103 * done by the drm core and insofar a pretty decent layering violation. This 1104 * shouldn't be used by any drivers. 1105 * 1106 * Returns: 1107 * True if the @nr corresponds to a DRM core ioctl number, false otherwise. 1108 */ 1109 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 1110 { 1111 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 1112 return false; 1113 1114 if (nr >= DRM_CORE_IOCTL_COUNT) 1115 return false; 1116 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 1117 1118 *flags = drm_ioctls[nr].flags; 1119 return true; 1120 } 1121 EXPORT_SYMBOL(drm_ioctl_flags); 1122
Indexes created Sat Sep 20 22:09:52 GMT 2025