1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright © 2017 Keith Packard <keithp@keithp.com> 4 */ 5#include <linux/file.h> 6#include <linux/uaccess.h> 7 8#include <drm/drm_auth.h> 9#include <drm/drm_crtc_helper.h> 10#include <drm/drm_drv.h> 11#include <drm/drm_file.h> 12#include <drm/drm_lease.h> 13#include <drm/drm_print.h> 14 15#include "drm_crtc_internal.h" 16#include "drm_internal.h" 17#include "drm_legacy.h" 18 19#define drm_for_each_lessee(lessee, lessor) \ 20 list_for_each_entry((lessee), &(lessor)->lessees, lessee_list) 21 22static uint64_t drm_lease_idr_object; 23 24/** 25 * drm_lease_owner - return ancestor owner drm_master 26 * @master: drm_master somewhere within tree of lessees and lessors 27 * 28 * RETURN: 29 * 30 * drm_master at the top of the tree (i.e, with lessor NULL 31 */ 32struct drm_master *drm_lease_owner(struct drm_master *master) 33{ 34 while (master->lessor != NULL) 35 master = master->lessor; 36 return master; 37} 38 39/** 40 * _drm_find_lessee - find lessee by id (idr_mutex held) 41 * @master: drm_master of lessor 42 * @lessee_id: id 43 * 44 * RETURN: 45 * 46 * drm_master of the lessee if valid, NULL otherwise 47 */ 48 49static struct drm_master* 50_drm_find_lessee(struct drm_master *master, int lessee_id) 51{ 52 lockdep_assert_held(&master->dev->mode_config.idr_mutex); 53 return idr_find(&drm_lease_owner(master)->lessee_idr, lessee_id); 54} 55 56/** 57 * _drm_lease_held_master - check to see if an object is leased (or owned) by master (idr_mutex held) 58 * @master: the master to check the lease status of 59 * @id: the id to check 60 * 61 * Checks if the specified master holds a lease on the object. Return 62 * value: 63 * 64 * true 'master' holds a lease on (or owns) the object 65 * false 'master' does not hold a lease. 66 */ 67static int _drm_lease_held_master(struct drm_master *master, int id) 68{ 69 lockdep_assert_held(&master->dev->mode_config.idr_mutex); 70 if (master->lessor) 71 return idr_find(&master->leases, id) != NULL; 72 return true; 73} 74 75/** 76 * _drm_has_leased - check to see if an object has been leased (idr_mutex held) 77 * @master: the master to check the lease status of 78 * @id: the id to check 79 * 80 * Checks if any lessee of 'master' holds a lease on 'id'. Return 81 * value: 82 * 83 * true Some lessee holds a lease on the object. 84 * false No lessee has a lease on the object. 85 */ 86static bool _drm_has_leased(struct drm_master *master, int id) 87{ 88 struct drm_master *lessee; 89 90 lockdep_assert_held(&master->dev->mode_config.idr_mutex); 91 drm_for_each_lessee(lessee, master) 92 if (_drm_lease_held_master(lessee, id)) 93 return true; 94 return false; 95} 96 97/** 98 * _drm_lease_held - check drm_mode_object lease status (idr_mutex held) 99 * @file_priv: the master drm_file 100 * @id: the object id 101 * 102 * Checks if the specified master holds a lease on the object. Return 103 * value: 104 * 105 * true 'master' holds a lease on (or owns) the object 106 * false 'master' does not hold a lease. 107 */ 108bool _drm_lease_held(struct drm_file *file_priv, int id) 109{ 110 bool ret; 111 struct drm_master *master; 112 113 if (!file_priv) 114 return true; 115 116 master = drm_file_get_master(file_priv); 117 if (!master) 118 return true; 119 ret = _drm_lease_held_master(master, id); 120 drm_master_put(&master); 121 122 return ret; 123} 124 125/** 126 * drm_lease_held - check drm_mode_object lease status (idr_mutex not held) 127 * @file_priv: the master drm_file 128 * @id: the object id 129 * 130 * Checks if the specified master holds a lease on the object. Return 131 * value: 132 * 133 * true 'master' holds a lease on (or owns) the object 134 * false 'master' does not hold a lease. 135 */ 136bool drm_lease_held(struct drm_file *file_priv, int id) 137{ 138 struct drm_master *master; 139 bool ret; 140 141 if (!file_priv) 142 return true; 143 144 master = drm_file_get_master(file_priv); 145 if (!master) 146 return true; 147 if (!master->lessor) { 148 ret = true; 149 goto out; 150 } 151 mutex_lock(&master->dev->mode_config.idr_mutex); 152 ret = _drm_lease_held_master(master, id); 153 mutex_unlock(&master->dev->mode_config.idr_mutex); 154 155out: 156 drm_master_put(&master); 157 return ret; 158} 159 160/** 161 * drm_lease_filter_crtcs - restricted crtc set to leased values (idr_mutex not held) 162 * @file_priv: requestor file 163 * @crtcs_in: bitmask of crtcs to check 164 * 165 * Reconstructs a crtc mask based on the crtcs which are visible 166 * through the specified file. 167 */ 168uint32_t drm_lease_filter_crtcs(struct drm_file *file_priv, uint32_t crtcs_in) 169{ 170 struct drm_master *master; 171 struct drm_device *dev; 172 struct drm_crtc *crtc; 173 int count_in, count_out; 174 uint32_t crtcs_out = 0; 175 176 if (!file_priv) 177 return crtcs_in; 178 179 master = drm_file_get_master(file_priv); 180 if (!master) 181 return crtcs_in; 182 if (!master->lessor) { 183 crtcs_out = crtcs_in; 184 goto out; 185 } 186 dev = master->dev; 187 188 count_in = count_out = 0; 189 mutex_lock(&master->dev->mode_config.idr_mutex); 190 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 191 if (_drm_lease_held_master(master, crtc->base.id)) { 192 uint32_t mask_in = 1ul << count_in; 193 194 if ((crtcs_in & mask_in) != 0) { 195 uint32_t mask_out = 1ul << count_out; 196 197 crtcs_out |= mask_out; 198 } 199 count_out++; 200 } 201 count_in++; 202 } 203 mutex_unlock(&master->dev->mode_config.idr_mutex); 204 205out: 206 drm_master_put(&master); 207 return crtcs_out; 208} 209 210/* 211 * drm_lease_create - create a new drm_master with leased objects (idr_mutex not held) 212 * @lessor: lease holder (or owner) of objects 213 * @leases: objects to lease to the new drm_master 214 * 215 * Uses drm_master_create to allocate a new drm_master, then checks to 216 * make sure all of the desired objects can be leased, atomically 217 * leasing them to the new drmmaster. 218 * 219 * ERR_PTR(-EACCES) some other master holds the title to any object 220 * ERR_PTR(-ENOENT) some object is not a valid DRM object for this device 221 * ERR_PTR(-EBUSY) some other lessee holds title to this object 222 * ERR_PTR(-EEXIST) same object specified more than once in the provided list 223 * ERR_PTR(-ENOMEM) allocation failed 224 */ 225static struct drm_master *drm_lease_create(struct drm_master *lessor, struct idr *leases) 226{ 227 struct drm_device *dev = lessor->dev; 228 int error; 229 struct drm_master *lessee; 230 int object; 231 int id; 232 void *entry; 233 234 DRM_DEBUG_LEASE("lessor %d\n", lessor->lessee_id); 235 236 lessee = drm_master_create(lessor->dev); 237 if (!lessee) { 238 DRM_DEBUG_LEASE("drm_master_create failed\n"); 239 return ERR_PTR(-ENOMEM); 240 } 241 242 mutex_lock(&dev->mode_config.idr_mutex); 243 244 idr_for_each_entry(leases, entry, object) { 245 error = 0; 246 if (!idr_find(&dev->mode_config.object_idr, object)) 247 error = -ENOENT; 248 else if (_drm_has_leased(lessor, object)) 249 error = -EBUSY; 250 251 if (error != 0) { 252 DRM_DEBUG_LEASE("object %d failed %d\n", object, error); 253 goto out_lessee; 254 } 255 } 256 257 /* Insert the new lessee into the tree */ 258 id = idr_alloc(&(drm_lease_owner(lessor)->lessee_idr), lessee, 1, 0, GFP_KERNEL); 259 if (id < 0) { 260 error = id; 261 goto out_lessee; 262 } 263 264 lessee->lessee_id = id; 265 lessee->lessor = drm_master_get(lessor); 266 list_add_tail(&lessee->lessee_list, &lessor->lessees); 267 268 /* Move the leases over */ 269 lessee->leases = *leases; 270 DRM_DEBUG_LEASE("new lessee %d %p, lessor %d %p\n", lessee->lessee_id, lessee, lessor->lessee_id, lessor); 271 272 mutex_unlock(&dev->mode_config.idr_mutex); 273 return lessee; 274 275out_lessee: 276 mutex_unlock(&dev->mode_config.idr_mutex); 277 278 drm_master_put(&lessee); 279 280 return ERR_PTR(error); 281} 282 283/** 284 * drm_lease_destroy - a master is going away (idr_mutex not held) 285 * @master: the drm_master being destroyed 286 * 287 * All lessees will have been destroyed as they 288 * hold a reference on their lessor. Notify any 289 * lessor for this master so that it can check 290 * the list of lessees. 291 */ 292void drm_lease_destroy(struct drm_master *master) 293{ 294 struct drm_device *dev = master->dev; 295 296 mutex_lock(&dev->mode_config.idr_mutex); 297 298 DRM_DEBUG_LEASE("drm_lease_destroy %d\n", master->lessee_id); 299 300 /* This master is referenced by all lessees, hence it cannot be destroyed 301 * until all of them have been 302 */ 303 WARN_ON(!list_empty(&master->lessees)); 304 305 /* Remove this master from the lessee idr in the owner */ 306 if (master->lessee_id != 0) { 307 DRM_DEBUG_LEASE("remove master %d from device list of lessees\n", master->lessee_id); 308 idr_remove(&(drm_lease_owner(master)->lessee_idr), master->lessee_id); 309 } 310 311 /* Remove this master from any lessee list it may be on */ 312 list_del(&master->lessee_list); 313 314 mutex_unlock(&dev->mode_config.idr_mutex); 315 316 if (master->lessor) { 317 /* Tell the master to check the lessee list */ 318 drm_sysfs_lease_event(dev); 319 drm_master_put(&master->lessor); 320 } 321 322 DRM_DEBUG_LEASE("drm_lease_destroy done %d\n", master->lessee_id); 323} 324 325/** 326 * _drm_lease_revoke - revoke access to all leased objects (idr_mutex held) 327 * @top: the master losing its lease 328 */ 329static void _drm_lease_revoke(struct drm_master *top) 330{ 331 int object; 332 void *entry; 333 struct drm_master *master = top; 334 335 lockdep_assert_held(&top->dev->mode_config.idr_mutex); 336 337 /* 338 * Walk the tree starting at 'top' emptying all leases. Because 339 * the tree is fully connected, we can do this without recursing 340 */ 341 for (;;) { 342 DRM_DEBUG_LEASE("revoke leases for %p %d\n", master, master->lessee_id); 343 344 /* Evacuate the lease */ 345 idr_for_each_entry(&master->leases, entry, object) 346 idr_remove(&master->leases, object); 347 348 /* Depth-first list walk */ 349 350 /* Down */ 351 if (!list_empty(&master->lessees)) { 352 master = list_first_entry(&master->lessees, struct drm_master, lessee_list); 353 } else { 354 /* Up */ 355 while (master != top && master == list_last_entry(&master->lessor->lessees, struct drm_master, lessee_list)) 356 master = master->lessor; 357 358 if (master == top) 359 break; 360 361 /* Over */ 362 master = list_next_entry(master, lessee_list); 363 } 364 } 365} 366 367/** 368 * drm_lease_revoke - revoke access to all leased objects (idr_mutex not held) 369 * @top: the master losing its lease 370 */ 371void drm_lease_revoke(struct drm_master *top) 372{ 373 mutex_lock(&top->dev->mode_config.idr_mutex); 374 _drm_lease_revoke(top); 375 mutex_unlock(&top->dev->mode_config.idr_mutex); 376} 377 378static int validate_lease(struct drm_device *dev, 379 int object_count, 380 struct drm_mode_object **objects, 381 bool universal_planes) 382{ 383 int o; 384 int has_crtc = -1; 385 int has_connector = -1; 386 int has_plane = -1; 387 388 /* we want to confirm that there is at least one crtc, plane 389 connector object. */ 390 391 for (o = 0; o < object_count; o++) { 392 if (objects[o]->type == DRM_MODE_OBJECT_CRTC && has_crtc == -1) { 393 has_crtc = o; 394 } 395 if (objects[o]->type == DRM_MODE_OBJECT_CONNECTOR && has_connector == -1) 396 has_connector = o; 397 398 if (universal_planes) { 399 if (objects[o]->type == DRM_MODE_OBJECT_PLANE && has_plane == -1) 400 has_plane = o; 401 } 402 } 403 if (has_crtc == -1 || has_connector == -1) 404 return -EINVAL; 405 if (universal_planes && has_plane == -1) 406 return -EINVAL; 407 return 0; 408} 409 410static int fill_object_idr(struct drm_device *dev, 411 struct drm_file *lessor_priv, 412 struct idr *leases, 413 int object_count, 414 u32 *object_ids) 415{ 416 struct drm_mode_object **objects; 417 u32 o; 418 int ret; 419 bool universal_planes = READ_ONCE(lessor_priv->universal_planes); 420 421 objects = kcalloc(object_count, sizeof(struct drm_mode_object *), 422 GFP_KERNEL); 423 if (!objects) 424 return -ENOMEM; 425 426 /* step one - get references to all the mode objects 427 and check for validity. */ 428 for (o = 0; o < object_count; o++) { 429 objects[o] = drm_mode_object_find(dev, lessor_priv, 430 object_ids[o], 431 DRM_MODE_OBJECT_ANY); 432 if (!objects[o]) { 433 ret = -ENOENT; 434 goto out_free_objects; 435 } 436 437 if (!drm_mode_object_lease_required(objects[o]->type)) { 438 DRM_DEBUG_KMS("invalid object for lease\n"); 439 ret = -EINVAL; 440 goto out_free_objects; 441 } 442 } 443 444 ret = validate_lease(dev, object_count, objects, universal_planes); 445 if (ret) { 446 DRM_DEBUG_LEASE("lease validation failed\n"); 447 goto out_free_objects; 448 } 449 450 /* add their IDs to the lease request - taking into account 451 universal planes */ 452 for (o = 0; o < object_count; o++) { 453 struct drm_mode_object *obj = objects[o]; 454 u32 object_id = objects[o]->id; 455 456 DRM_DEBUG_LEASE("Adding object %d to lease\n", object_id); 457 458 /* 459 * We're using an IDR to hold the set of leased 460 * objects, but we don't need to point at the object's 461 * data structure from the lease as the main object_idr 462 * will be used to actually find that. Instead, all we 463 * really want is a 'leased/not-leased' result, for 464 * which any non-NULL pointer will work fine. 465 */ 466 ret = idr_alloc(leases, &drm_lease_idr_object , object_id, object_id + 1, GFP_KERNEL); 467 if (ret < 0) { 468 DRM_DEBUG_LEASE("Object %d cannot be inserted into leases (%d)\n", 469 object_id, ret); 470 goto out_free_objects; 471 } 472 if (obj->type == DRM_MODE_OBJECT_CRTC && !universal_planes) { 473 struct drm_crtc *crtc = obj_to_crtc(obj); 474 475 ret = idr_alloc(leases, &drm_lease_idr_object, crtc->primary->base.id, crtc->primary->base.id + 1, GFP_KERNEL); 476 if (ret < 0) { 477 DRM_DEBUG_LEASE("Object primary plane %d cannot be inserted into leases (%d)\n", 478 object_id, ret); 479 goto out_free_objects; 480 } 481 if (crtc->cursor) { 482 ret = idr_alloc(leases, &drm_lease_idr_object, crtc->cursor->base.id, crtc->cursor->base.id + 1, GFP_KERNEL); 483 if (ret < 0) { 484 DRM_DEBUG_LEASE("Object cursor plane %d cannot be inserted into leases (%d)\n", 485 object_id, ret); 486 goto out_free_objects; 487 } 488 } 489 } 490 } 491 492 ret = 0; 493out_free_objects: 494 for (o = 0; o < object_count; o++) { 495 if (objects[o]) 496 drm_mode_object_put(objects[o]); 497 } 498 kfree(objects); 499 return ret; 500} 501 502/** 503 * drm_mode_create_lease_ioctl - create a new lease 504 * @dev: the drm device 505 * @data: pointer to struct drm_mode_create_lease 506 * @lessor_priv: the file being manipulated 507 * 508 * The master associated with the specified file will have a lease 509 * created containing the objects specified in the ioctl structure. 510 * A file descriptor will be allocated for that and returned to the 511 * application. 512 */ 513int drm_mode_create_lease_ioctl(struct drm_device *dev, 514 void *data, struct drm_file *lessor_priv) 515{ 516 struct drm_mode_create_lease *cl = data; 517 size_t object_count; 518 int ret = 0; 519 struct idr leases; 520 struct drm_master *lessor; 521 struct drm_master *lessee = NULL; 522 struct file *lessee_file = NULL; 523 struct file *lessor_file = lessor_priv->filp; 524 struct drm_file *lessee_priv; 525 int fd = -1; 526 uint32_t *object_ids; 527 528 /* Can't lease without MODESET */ 529 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 530 return -EOPNOTSUPP; 531 532 /* need some objects */ 533 if (cl->object_count == 0) { 534 DRM_DEBUG_LEASE("no objects in lease\n"); 535 return -EINVAL; 536 } 537 538 if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK))) { 539 DRM_DEBUG_LEASE("invalid flags\n"); 540 return -EINVAL; 541 } 542 543 lessor = drm_file_get_master(lessor_priv); 544 /* Do not allow sub-leases */ 545 if (lessor->lessor) { 546 DRM_DEBUG_LEASE("recursive leasing not allowed\n"); 547 ret = -EINVAL; 548 goto out_lessor; 549 } 550 551 object_count = cl->object_count; 552 553 object_ids = memdup_user(u64_to_user_ptr(cl->object_ids), 554 array_size(object_count, sizeof(__u32))); 555 if (IS_ERR(object_ids)) { 556 ret = PTR_ERR(object_ids); 557 goto out_lessor; 558 } 559 560 idr_init(&leases); 561 562 /* fill and validate the object idr */ 563 ret = fill_object_idr(dev, lessor_priv, &leases, 564 object_count, object_ids); 565 kfree(object_ids); 566 if (ret) { 567 DRM_DEBUG_LEASE("lease object lookup failed: %i\n", ret); 568 idr_destroy(&leases); 569 goto out_lessor; 570 } 571 572 /* Allocate a file descriptor for the lease */ 573 fd = get_unused_fd_flags(cl->flags & (O_CLOEXEC | O_NONBLOCK)); 574 if (fd < 0) { 575 idr_destroy(&leases); 576 ret = fd; 577 goto out_lessor; 578 } 579 580 DRM_DEBUG_LEASE("Creating lease\n"); 581 /* lessee will take the ownership of leases */ 582 lessee = drm_lease_create(lessor, &leases); 583 584 if (IS_ERR(lessee)) { 585 ret = PTR_ERR(lessee); 586 idr_destroy(&leases); 587 goto out_leases; 588 } 589 590 /* Clone the lessor file to create a new file for us */ 591 DRM_DEBUG_LEASE("Allocating lease file\n"); 592 lessee_file = file_clone_open(lessor_file); 593 if (IS_ERR(lessee_file)) { 594 ret = PTR_ERR(lessee_file); 595 goto out_lessee; 596 } 597 598 lessee_priv = lessee_file->private_data; 599 /* Change the file to a master one */ 600 drm_master_put(&lessee_priv->master); 601 lessee_priv->master = lessee; 602 lessee_priv->is_master = 1; 603 lessee_priv->authenticated = 1; 604 605 /* Pass fd back to userspace */ 606 DRM_DEBUG_LEASE("Returning fd %d id %d\n", fd, lessee->lessee_id); 607 cl->fd = fd; 608 cl->lessee_id = lessee->lessee_id; 609 610 /* Hook up the fd */ 611 fd_install(fd, lessee_file); 612 613 drm_master_put(&lessor); 614 DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl succeeded\n"); 615 return 0; 616 617out_lessee: 618 drm_master_put(&lessee); 619 620out_leases: 621 put_unused_fd(fd); 622 623out_lessor: 624 drm_master_put(&lessor); 625 DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl failed: %d\n", ret); 626 return ret; 627} 628 629/** 630 * drm_mode_list_lessees_ioctl - list lessee ids 631 * @dev: the drm device 632 * @data: pointer to struct drm_mode_list_lessees 633 * @lessor_priv: the file being manipulated 634 * 635 * Starting from the master associated with the specified file, 636 * the master with the provided lessee_id is found, and then 637 * an array of lessee ids associated with leases from that master 638 * are returned. 639 */ 640 641int drm_mode_list_lessees_ioctl(struct drm_device *dev, 642 void *data, struct drm_file *lessor_priv) 643{ 644 struct drm_mode_list_lessees *arg = data; 645 __u32 __user *lessee_ids = (__u32 __user *) (uintptr_t) (arg->lessees_ptr); 646 __u32 count_lessees = arg->count_lessees; 647 struct drm_master *lessor, *lessee; 648 int count; 649 int ret = 0; 650 651 if (arg->pad) 652 return -EINVAL; 653 654 /* Can't lease without MODESET */ 655 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 656 return -EOPNOTSUPP; 657 658 lessor = drm_file_get_master(lessor_priv); 659 DRM_DEBUG_LEASE("List lessees for %d\n", lessor->lessee_id); 660 661 mutex_lock(&dev->mode_config.idr_mutex); 662 663 count = 0; 664 drm_for_each_lessee(lessee, lessor) { 665 /* Only list un-revoked leases */ 666 if (!idr_is_empty(&lessee->leases)) { 667 if (count_lessees > count) { 668 DRM_DEBUG_LEASE("Add lessee %d\n", lessee->lessee_id); 669 ret = put_user(lessee->lessee_id, lessee_ids + count); 670 if (ret) 671 break; 672 } 673 count++; 674 } 675 } 676 677 DRM_DEBUG_LEASE("Lessor leases to %d\n", count); 678 if (ret == 0) 679 arg->count_lessees = count; 680 681 mutex_unlock(&dev->mode_config.idr_mutex); 682 drm_master_put(&lessor); 683 684 return ret; 685} 686 687/** 688 * drm_mode_get_lease_ioctl - list leased objects 689 * @dev: the drm device 690 * @data: pointer to struct drm_mode_get_lease 691 * @lessee_priv: the file being manipulated 692 * 693 * Return the list of leased objects for the specified lessee 694 */ 695 696int drm_mode_get_lease_ioctl(struct drm_device *dev, 697 void *data, struct drm_file *lessee_priv) 698{ 699 struct drm_mode_get_lease *arg = data; 700 __u32 __user *object_ids = (__u32 __user *) (uintptr_t) (arg->objects_ptr); 701 __u32 count_objects = arg->count_objects; 702 struct drm_master *lessee; 703 struct idr *object_idr; 704 int count; 705 void *entry; 706 int object; 707 int ret = 0; 708 709 if (arg->pad) 710 return -EINVAL; 711 712 /* Can't lease without MODESET */ 713 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 714 return -EOPNOTSUPP; 715 716 lessee = drm_file_get_master(lessee_priv); 717 DRM_DEBUG_LEASE("get lease for %d\n", lessee->lessee_id); 718 719 mutex_lock(&dev->mode_config.idr_mutex); 720 721 if (lessee->lessor == NULL) 722 /* owner can use all objects */ 723 object_idr = &lessee->dev->mode_config.object_idr; 724 else 725 /* lessee can only use allowed object */ 726 object_idr = &lessee->leases; 727 728 count = 0; 729 idr_for_each_entry(object_idr, entry, object) { 730 if (count_objects > count) { 731 DRM_DEBUG_LEASE("adding object %d\n", object); 732 ret = put_user(object, object_ids + count); 733 if (ret) 734 break; 735 } 736 count++; 737 } 738 739 DRM_DEBUG("lease holds %d objects\n", count); 740 if (ret == 0) 741 arg->count_objects = count; 742 743 mutex_unlock(&dev->mode_config.idr_mutex); 744 drm_master_put(&lessee); 745 746 return ret; 747} 748 749/** 750 * drm_mode_revoke_lease_ioctl - revoke lease 751 * @dev: the drm device 752 * @data: pointer to struct drm_mode_revoke_lease 753 * @lessor_priv: the file being manipulated 754 * 755 * This removes all of the objects from the lease without 756 * actually getting rid of the lease itself; that way all 757 * references to it still work correctly 758 */ 759int drm_mode_revoke_lease_ioctl(struct drm_device *dev, 760 void *data, struct drm_file *lessor_priv) 761{ 762 struct drm_mode_revoke_lease *arg = data; 763 struct drm_master *lessor; 764 struct drm_master *lessee; 765 int ret = 0; 766 767 DRM_DEBUG_LEASE("revoke lease for %d\n", arg->lessee_id); 768 769 /* Can't lease without MODESET */ 770 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 771 return -EOPNOTSUPP; 772 773 lessor = drm_file_get_master(lessor_priv); 774 mutex_lock(&dev->mode_config.idr_mutex); 775 776 lessee = _drm_find_lessee(lessor, arg->lessee_id); 777 778 /* No such lessee */ 779 if (!lessee) { 780 ret = -ENOENT; 781 goto fail; 782 } 783 784 /* Lease is not held by lessor */ 785 if (lessee->lessor != lessor) { 786 ret = -EACCES; 787 goto fail; 788 } 789 790 _drm_lease_revoke(lessee); 791 792fail: 793 mutex_unlock(&dev->mode_config.idr_mutex); 794 drm_master_put(&lessor); 795 796 return ret; 797} 798