1/* 2 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org 3 * 4 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California. 5 * All Rights Reserved. 6 * 7 * Author Rickard E. (Rik) Faith <faith@valinux.com> 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the "Software"), 11 * to deal in the Software without restriction, including without limitation 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 13 * and/or sell copies of the Software, and to permit persons to whom the 14 * Software is furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice (including the next 17 * paragraph) shall be included in all copies or substantial portions of the 18 * Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 23 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 26 * DEALINGS IN THE SOFTWARE. 27 */ 28 29#include <linux/debugfs.h> 30#include <linux/fs.h> 31#include <linux/module.h> 32#include <linux/moduleparam.h> 33#include <linux/mount.h> 34#include <linux/slab.h> 35#include <drm/drmP.h> 36#include <drm/drm_core.h> 37#include "drm_legacy.h" 38#include "drm_internal.h" 39 40unsigned int drm_debug = 0; /* 1 to enable debug output */ 41EXPORT_SYMBOL(drm_debug); 42 43bool drm_atomic = 0; 44 45MODULE_AUTHOR(CORE_AUTHOR); 46MODULE_DESCRIPTION(CORE_DESC); 47MODULE_LICENSE("GPL and additional rights"); 48MODULE_PARM_DESC(debug, "Enable debug output"); 49MODULE_PARM_DESC(atomic, "Enable experimental atomic KMS API"); 50MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); 51MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); 52MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); 53 54module_param_named(debug, drm_debug, int, 0600); 55module_param_named_unsafe(atomic, drm_atomic, bool, 0600); 56 57static DEFINE_SPINLOCK(drm_minor_lock); 58static struct idr drm_minors_idr; 59 60struct class *drm_class; 61static struct dentry *drm_debugfs_root; 62 63void drm_err(const char *format, ...) 64{ 65 struct va_format vaf; 66 va_list args; 67 68 va_start(args, format); 69 70 vaf.fmt = format; 71 vaf.va = &args; 72 73 printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV", 74 __builtin_return_address(0), &vaf); 75 76 va_end(args); 77} 78EXPORT_SYMBOL(drm_err); 79 80void drm_ut_debug_printk(const char *function_name, const char *format, ...) 81{ 82 struct va_format vaf; 83 va_list args; 84 85 va_start(args, format); 86 vaf.fmt = format; 87 vaf.va = &args; 88 89 printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf); 90 91 va_end(args); 92} 93EXPORT_SYMBOL(drm_ut_debug_printk); 94 95#define DRM_MAGIC_HASH_ORDER 4 /**< Size of key hash table. Must be power of 2. */ 96 97struct drm_master *drm_master_create(struct drm_minor *minor) 98{ 99 struct drm_master *master; 100 101 master = kzalloc(sizeof(*master), GFP_KERNEL); 102 if (!master) 103 return NULL; 104 105 kref_init(&master->refcount); 106 spin_lock_init(&master->lock.spinlock); 107 init_waitqueue_head(&master->lock.lock_queue); 108 if (drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER)) { 109 kfree(master); 110 return NULL; 111 } 112 INIT_LIST_HEAD(&master->magicfree); 113 master->minor = minor; 114 115 return master; 116} 117 118struct drm_master *drm_master_get(struct drm_master *master) 119{ 120 kref_get(&master->refcount); 121 return master; 122} 123EXPORT_SYMBOL(drm_master_get); 124 125static void drm_master_destroy(struct kref *kref) 126{ 127 struct drm_master *master = container_of(kref, struct drm_master, refcount); 128 struct drm_device *dev = master->minor->dev; 129 struct drm_map_list *r_list, *list_temp; 130 131 mutex_lock(&dev->struct_mutex); 132 if (dev->driver->master_destroy) 133 dev->driver->master_destroy(dev, master); 134 135 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) { 136 if (r_list->master == master) { 137 drm_legacy_rmmap_locked(dev, r_list->map); 138 r_list = NULL; 139 } 140 } 141 142 if (master->unique) { 143 kfree(master->unique); 144 master->unique = NULL; 145 master->unique_len = 0; 146 } 147 148 drm_ht_remove(&master->magiclist); 149 150 mutex_unlock(&dev->struct_mutex); 151 kfree(master); 152} 153 154void drm_master_put(struct drm_master **master) 155{ 156 kref_put(&(*master)->refcount, drm_master_destroy); 157 *master = NULL; 158} 159EXPORT_SYMBOL(drm_master_put); 160 161int drm_setmaster_ioctl(struct drm_device *dev, void *data, 162 struct drm_file *file_priv) 163{ 164 int ret = 0; 165 166 mutex_lock(&dev->master_mutex); 167 if (file_priv->is_master) 168 goto out_unlock; 169 170 if (file_priv->minor->master) { 171 ret = -EINVAL; 172 goto out_unlock; 173 } 174 175 if (!file_priv->master) { 176 ret = -EINVAL; 177 goto out_unlock; 178 } 179 180 file_priv->minor->master = drm_master_get(file_priv->master); 181 file_priv->is_master = 1; 182 if (dev->driver->master_set) { 183 ret = dev->driver->master_set(dev, file_priv, false); 184 if (unlikely(ret != 0)) { 185 file_priv->is_master = 0; 186 drm_master_put(&file_priv->minor->master); 187 } 188 } 189 190out_unlock: 191 mutex_unlock(&dev->master_mutex); 192 return ret; 193} 194 195int drm_dropmaster_ioctl(struct drm_device *dev, void *data, 196 struct drm_file *file_priv) 197{ 198 int ret = -EINVAL; 199 200 mutex_lock(&dev->master_mutex); 201 if (!file_priv->is_master) 202 goto out_unlock; 203 204 if (!file_priv->minor->master) 205 goto out_unlock; 206 207 ret = 0; 208 if (dev->driver->master_drop) 209 dev->driver->master_drop(dev, file_priv, false); 210 drm_master_put(&file_priv->minor->master); 211 file_priv->is_master = 0; 212 213out_unlock: 214 mutex_unlock(&dev->master_mutex); 215 return ret; 216} 217 218/* 219 * DRM Minors 220 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each 221 * of them is represented by a drm_minor object. Depending on the capabilities 222 * of the device-driver, different interfaces are registered. 223 * 224 * Minors can be accessed via dev->$minor_name. This pointer is either 225 * NULL or a valid drm_minor pointer and stays valid as long as the device is 226 * valid. This means, DRM minors have the same life-time as the underlying 227 * device. However, this doesn't mean that the minor is active. Minors are 228 * registered and unregistered dynamically according to device-state. 229 */ 230 231static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, 232 unsigned int type) 233{ 234 switch (type) { 235 case DRM_MINOR_LEGACY: 236 return &dev->primary; 237 case DRM_MINOR_RENDER: 238 return &dev->render; 239 case DRM_MINOR_CONTROL: 240 return &dev->control; 241 default: 242 return NULL; 243 } 244} 245 246static int drm_minor_alloc(struct drm_device *dev, unsigned int type) 247{ 248 struct drm_minor *minor; 249 unsigned long flags; 250 int r; 251 252 minor = kzalloc(sizeof(*minor), GFP_KERNEL); 253 if (!minor) 254 return -ENOMEM; 255 256 minor->type = type; 257 minor->dev = dev; 258 259 idr_preload(GFP_KERNEL); 260 spin_lock_irqsave(&drm_minor_lock, flags); 261 r = idr_alloc(&drm_minors_idr, 262 NULL, 263 64 * type, 264 64 * (type + 1), 265 GFP_NOWAIT); 266 spin_unlock_irqrestore(&drm_minor_lock, flags); 267 idr_preload_end(); 268 269 if (r < 0) 270 goto err_free; 271 272 minor->index = r; 273 274 minor->kdev = drm_sysfs_minor_alloc(minor); 275 if (IS_ERR(minor->kdev)) { 276 r = PTR_ERR(minor->kdev); 277 goto err_index; 278 } 279 280 *drm_minor_get_slot(dev, type) = minor; 281 return 0; 282 283err_index: 284 spin_lock_irqsave(&drm_minor_lock, flags); 285 idr_remove(&drm_minors_idr, minor->index); 286 spin_unlock_irqrestore(&drm_minor_lock, flags); 287err_free: 288 kfree(minor); 289 return r; 290} 291 292static void drm_minor_free(struct drm_device *dev, unsigned int type) 293{ 294 struct drm_minor **slot, *minor; 295 unsigned long flags; 296 297 slot = drm_minor_get_slot(dev, type); 298 minor = *slot; 299 if (!minor) 300 return; 301 302 drm_mode_group_destroy(&minor->mode_group); 303 put_device(minor->kdev); 304 305 spin_lock_irqsave(&drm_minor_lock, flags); 306 idr_remove(&drm_minors_idr, minor->index); 307 spin_unlock_irqrestore(&drm_minor_lock, flags); 308 309 kfree(minor); 310 *slot = NULL; 311} 312 313static int drm_minor_register(struct drm_device *dev, unsigned int type) 314{ 315 struct drm_minor *minor; 316 unsigned long flags; 317 int ret; 318 319 DRM_DEBUG("\n"); 320 321 minor = *drm_minor_get_slot(dev, type); 322 if (!minor) 323 return 0; 324 325 ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); 326 if (ret) { 327 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); 328 return ret; 329 } 330 331 ret = device_add(minor->kdev); 332 if (ret) 333 goto err_debugfs; 334 335 /* replace NULL with @minor so lookups will succeed from now on */ 336 spin_lock_irqsave(&drm_minor_lock, flags); 337 idr_replace(&drm_minors_idr, minor, minor->index); 338 spin_unlock_irqrestore(&drm_minor_lock, flags); 339 340 DRM_DEBUG("new minor registered %d\n", minor->index); 341 return 0; 342 343err_debugfs: 344 drm_debugfs_cleanup(minor); 345 return ret; 346} 347 348static void drm_minor_unregister(struct drm_device *dev, unsigned int type) 349{ 350 struct drm_minor *minor; 351 unsigned long flags; 352 353 minor = *drm_minor_get_slot(dev, type); 354 if (!minor || !device_is_registered(minor->kdev)) 355 return; 356 357 /* replace @minor with NULL so lookups will fail from now on */ 358 spin_lock_irqsave(&drm_minor_lock, flags); 359 idr_replace(&drm_minors_idr, NULL, minor->index); 360 spin_unlock_irqrestore(&drm_minor_lock, flags); 361 362 device_del(minor->kdev); 363 dev_set_drvdata(minor->kdev, NULL); /* safety belt */ 364 drm_debugfs_cleanup(minor); 365} 366 367/** 368 * drm_minor_acquire - Acquire a DRM minor 369 * @minor_id: Minor ID of the DRM-minor 370 * 371 * Looks up the given minor-ID and returns the respective DRM-minor object. The 372 * refence-count of the underlying device is increased so you must release this 373 * object with drm_minor_release(). 374 * 375 * As long as you hold this minor, it is guaranteed that the object and the 376 * minor->dev pointer will stay valid! However, the device may get unplugged and 377 * unregistered while you hold the minor. 378 * 379 * Returns: 380 * Pointer to minor-object with increased device-refcount, or PTR_ERR on 381 * failure. 382 */ 383struct drm_minor *drm_minor_acquire(unsigned int minor_id) 384{ 385 struct drm_minor *minor; 386 unsigned long flags; 387 388 spin_lock_irqsave(&drm_minor_lock, flags); 389 minor = idr_find(&drm_minors_idr, minor_id); 390 if (minor) 391 drm_dev_ref(minor->dev); 392 spin_unlock_irqrestore(&drm_minor_lock, flags); 393 394 if (!minor) { 395 return ERR_PTR(-ENODEV); 396 } else if (drm_device_is_unplugged(minor->dev)) { 397 drm_dev_unref(minor->dev); 398 return ERR_PTR(-ENODEV); 399 } 400 401 return minor; 402} 403 404/** 405 * drm_minor_release - Release DRM minor 406 * @minor: Pointer to DRM minor object 407 * 408 * Release a minor that was previously acquired via drm_minor_acquire(). 409 */ 410void drm_minor_release(struct drm_minor *minor) 411{ 412 drm_dev_unref(minor->dev); 413} 414 415/** 416 * drm_put_dev - Unregister and release a DRM device 417 * @dev: DRM device 418 * 419 * Called at module unload time or when a PCI device is unplugged. 420 * 421 * Use of this function is discouraged. It will eventually go away completely. 422 * Please use drm_dev_unregister() and drm_dev_unref() explicitly instead. 423 * 424 * Cleans up all DRM device, calling drm_lastclose(). 425 */ 426void drm_put_dev(struct drm_device *dev) 427{ 428 DRM_DEBUG("\n"); 429 430 if (!dev) { 431 DRM_ERROR("cleanup called no dev\n"); 432 return; 433 } 434 435 drm_dev_unregister(dev); 436 drm_dev_unref(dev); 437} 438EXPORT_SYMBOL(drm_put_dev); 439 440void drm_unplug_dev(struct drm_device *dev) 441{ 442 /* for a USB device */ 443 drm_minor_unregister(dev, DRM_MINOR_LEGACY); 444 drm_minor_unregister(dev, DRM_MINOR_RENDER); 445 drm_minor_unregister(dev, DRM_MINOR_CONTROL); 446 447 mutex_lock(&drm_global_mutex); 448 449 drm_device_set_unplugged(dev); 450 451 if (dev->open_count == 0) { 452 drm_put_dev(dev); 453 } 454 mutex_unlock(&drm_global_mutex); 455} 456EXPORT_SYMBOL(drm_unplug_dev); 457 458/* 459 * DRM internal mount 460 * We want to be able to allocate our own "struct address_space" to control 461 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow 462 * stand-alone address_space objects, so we need an underlying inode. As there 463 * is no way to allocate an independent inode easily, we need a fake internal 464 * VFS mount-point. 465 * 466 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() 467 * frees it again. You are allowed to use iget() and iput() to get references to 468 * the inode. But each drm_fs_inode_new() call must be paired with exactly one 469 * drm_fs_inode_free() call (which does not have to be the last iput()). 470 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it 471 * between multiple inode-users. You could, technically, call 472 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an 473 * iput(), but this way you'd end up with a new vfsmount for each inode. 474 */ 475 476static int drm_fs_cnt; 477static struct vfsmount *drm_fs_mnt; 478 479static const struct dentry_operations drm_fs_dops = { 480 .d_dname = simple_dname, 481}; 482 483static const struct super_operations drm_fs_sops = { 484 .statfs = simple_statfs, 485}; 486 487static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, 488 const char *dev_name, void *data) 489{ 490 return mount_pseudo(fs_type, 491 "drm:", 492 &drm_fs_sops, 493 &drm_fs_dops, 494 0x010203ff); 495} 496 497static struct file_system_type drm_fs_type = { 498 .name = "drm", 499 .owner = THIS_MODULE, 500 .mount = drm_fs_mount, 501 .kill_sb = kill_anon_super, 502}; 503 504static struct inode *drm_fs_inode_new(void) 505{ 506 struct inode *inode; 507 int r; 508 509 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); 510 if (r < 0) { 511 DRM_ERROR("Cannot mount pseudo fs: %d\n", r); 512 return ERR_PTR(r); 513 } 514 515 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); 516 if (IS_ERR(inode)) 517 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); 518 519 return inode; 520} 521 522static void drm_fs_inode_free(struct inode *inode) 523{ 524 if (inode) { 525 iput(inode); 526 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); 527 } 528} 529 530/** 531 * drm_dev_alloc - Allocate new DRM device 532 * @driver: DRM driver to allocate device for 533 * @parent: Parent device object 534 * 535 * Allocate and initialize a new DRM device. No device registration is done. 536 * Call drm_dev_register() to advertice the device to user space and register it 537 * with other core subsystems. 538 * 539 * The initial ref-count of the object is 1. Use drm_dev_ref() and 540 * drm_dev_unref() to take and drop further ref-counts. 541 * 542 * Note that for purely virtual devices @parent can be NULL. 543 * 544 * RETURNS: 545 * Pointer to new DRM device, or NULL if out of memory. 546 */ 547struct drm_device *drm_dev_alloc(struct drm_driver *driver, 548 struct device *parent) 549{ 550 struct drm_device *dev; 551 int ret; 552 553 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 554 if (!dev) 555 return NULL; 556 557 kref_init(&dev->ref); 558 dev->dev = parent; 559 dev->driver = driver; 560 561 INIT_LIST_HEAD(&dev->filelist); 562 INIT_LIST_HEAD(&dev->ctxlist); 563 INIT_LIST_HEAD(&dev->vmalist); 564 INIT_LIST_HEAD(&dev->maplist); 565 INIT_LIST_HEAD(&dev->vblank_event_list); 566 567 spin_lock_init(&dev->buf_lock); 568 spin_lock_init(&dev->event_lock); 569 mutex_init(&dev->struct_mutex); 570 mutex_init(&dev->ctxlist_mutex); 571 mutex_init(&dev->master_mutex); 572 573 dev->anon_inode = drm_fs_inode_new(); 574 if (IS_ERR(dev->anon_inode)) { 575 ret = PTR_ERR(dev->anon_inode); 576 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); 577 goto err_free; 578 } 579 580 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 581 ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); 582 if (ret) 583 goto err_minors; 584 } 585 586 if (drm_core_check_feature(dev, DRIVER_RENDER)) { 587 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); 588 if (ret) 589 goto err_minors; 590 } 591 592 ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY); 593 if (ret) 594 goto err_minors; 595 596 if (drm_ht_create(&dev->map_hash, 12)) 597 goto err_minors; 598 599 ret = drm_legacy_ctxbitmap_init(dev); 600 if (ret) { 601 DRM_ERROR("Cannot allocate memory for context bitmap.\n"); 602 goto err_ht; 603 } 604 605 if (drm_core_check_feature(dev, DRIVER_GEM)) { 606 ret = drm_gem_init(dev); 607 if (ret) { 608 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); 609 goto err_ctxbitmap; 610 } 611 } 612 613 return dev; 614 615err_ctxbitmap: 616 drm_legacy_ctxbitmap_cleanup(dev); 617err_ht: 618 drm_ht_remove(&dev->map_hash); 619err_minors: 620 drm_minor_free(dev, DRM_MINOR_LEGACY); 621 drm_minor_free(dev, DRM_MINOR_RENDER); 622 drm_minor_free(dev, DRM_MINOR_CONTROL); 623 drm_fs_inode_free(dev->anon_inode); 624err_free: 625 mutex_destroy(&dev->master_mutex); 626 kfree(dev); 627 return NULL; 628} 629EXPORT_SYMBOL(drm_dev_alloc); 630 631static void drm_dev_release(struct kref *ref) 632{ 633 struct drm_device *dev = container_of(ref, struct drm_device, ref); 634 635 if (drm_core_check_feature(dev, DRIVER_GEM)) 636 drm_gem_destroy(dev); 637 638 drm_legacy_ctxbitmap_cleanup(dev); 639 drm_ht_remove(&dev->map_hash); 640 drm_fs_inode_free(dev->anon_inode); 641 642 drm_minor_free(dev, DRM_MINOR_LEGACY); 643 drm_minor_free(dev, DRM_MINOR_RENDER); 644 drm_minor_free(dev, DRM_MINOR_CONTROL); 645 646 mutex_destroy(&dev->master_mutex); 647 kfree(dev->unique); 648 kfree(dev); 649} 650 651/** 652 * drm_dev_ref - Take reference of a DRM device 653 * @dev: device to take reference of or NULL 654 * 655 * This increases the ref-count of @dev by one. You *must* already own a 656 * reference when calling this. Use drm_dev_unref() to drop this reference 657 * again. 658 * 659 * This function never fails. However, this function does not provide *any* 660 * guarantee whether the device is alive or running. It only provides a 661 * reference to the object and the memory associated with it. 662 */ 663void drm_dev_ref(struct drm_device *dev) 664{ 665 if (dev) 666 kref_get(&dev->ref); 667} 668EXPORT_SYMBOL(drm_dev_ref); 669 670/** 671 * drm_dev_unref - Drop reference of a DRM device 672 * @dev: device to drop reference of or NULL 673 * 674 * This decreases the ref-count of @dev by one. The device is destroyed if the 675 * ref-count drops to zero. 676 */ 677void drm_dev_unref(struct drm_device *dev) 678{ 679 if (dev) 680 kref_put(&dev->ref, drm_dev_release); 681} 682EXPORT_SYMBOL(drm_dev_unref); 683 684/** 685 * drm_dev_register - Register DRM device 686 * @dev: Device to register 687 * @flags: Flags passed to the driver's .load() function 688 * 689 * Register the DRM device @dev with the system, advertise device to user-space 690 * and start normal device operation. @dev must be allocated via drm_dev_alloc() 691 * previously. 692 * 693 * Never call this twice on any device! 694 * 695 * RETURNS: 696 * 0 on success, negative error code on failure. 697 */ 698int drm_dev_register(struct drm_device *dev, unsigned long flags) 699{ 700 int ret; 701 702 mutex_lock(&drm_global_mutex); 703 704 ret = drm_minor_register(dev, DRM_MINOR_CONTROL); 705 if (ret) 706 goto err_minors; 707 708 ret = drm_minor_register(dev, DRM_MINOR_RENDER); 709 if (ret) 710 goto err_minors; 711 712 ret = drm_minor_register(dev, DRM_MINOR_LEGACY); 713 if (ret) 714 goto err_minors; 715 716 if (dev->driver->load) { 717 ret = dev->driver->load(dev, flags); 718 if (ret) 719 goto err_minors; 720 } 721 722 /* setup grouping for legacy outputs */ 723 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 724 ret = drm_mode_group_init_legacy_group(dev, 725 &dev->primary->mode_group); 726 if (ret) 727 goto err_unload; 728 } 729 730 ret = 0; 731 goto out_unlock; 732 733err_unload: 734 if (dev->driver->unload) 735 dev->driver->unload(dev); 736err_minors: 737 drm_minor_unregister(dev, DRM_MINOR_LEGACY); 738 drm_minor_unregister(dev, DRM_MINOR_RENDER); 739 drm_minor_unregister(dev, DRM_MINOR_CONTROL); 740out_unlock: 741 mutex_unlock(&drm_global_mutex); 742 return ret; 743} 744EXPORT_SYMBOL(drm_dev_register); 745 746/** 747 * drm_dev_unregister - Unregister DRM device 748 * @dev: Device to unregister 749 * 750 * Unregister the DRM device from the system. This does the reverse of 751 * drm_dev_register() but does not deallocate the device. The caller must call 752 * drm_dev_unref() to drop their final reference. 753 */ 754void drm_dev_unregister(struct drm_device *dev) 755{ 756 struct drm_map_list *r_list, *list_temp; 757 758 drm_lastclose(dev); 759 760 if (dev->driver->unload) 761 dev->driver->unload(dev); 762 763 if (dev->agp) 764 drm_pci_agp_destroy(dev); 765 766 drm_vblank_cleanup(dev); 767 768 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) 769 drm_legacy_rmmap(dev, r_list->map); 770 771 drm_minor_unregister(dev, DRM_MINOR_LEGACY); 772 drm_minor_unregister(dev, DRM_MINOR_RENDER); 773 drm_minor_unregister(dev, DRM_MINOR_CONTROL); 774} 775EXPORT_SYMBOL(drm_dev_unregister); 776 777/** 778 * drm_dev_set_unique - Set the unique name of a DRM device 779 * @dev: device of which to set the unique name 780 * @fmt: format string for unique name 781 * 782 * Sets the unique name of a DRM device using the specified format string and 783 * a variable list of arguments. Drivers can use this at driver probe time if 784 * the unique name of the devices they drive is static. 785 * 786 * Return: 0 on success or a negative error code on failure. 787 */ 788int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...) 789{ 790 va_list ap; 791 792 kfree(dev->unique); 793 794 va_start(ap, fmt); 795 dev->unique = kvasprintf(GFP_KERNEL, fmt, ap); 796 va_end(ap); 797 798 return dev->unique ? 0 : -ENOMEM; 799} 800EXPORT_SYMBOL(drm_dev_set_unique); 801 802/* 803 * DRM Core 804 * The DRM core module initializes all global DRM objects and makes them 805 * available to drivers. Once setup, drivers can probe their respective 806 * devices. 807 * Currently, core management includes: 808 * - The "DRM-Global" key/value database 809 * - Global ID management for connectors 810 * - DRM major number allocation 811 * - DRM minor management 812 * - DRM sysfs class 813 * - DRM debugfs root 814 * 815 * Furthermore, the DRM core provides dynamic char-dev lookups. For each 816 * interface registered on a DRM device, you can request minor numbers from DRM 817 * core. DRM core takes care of major-number management and char-dev 818 * registration. A stub ->open() callback forwards any open() requests to the 819 * registered minor. 820 */ 821 822static int drm_stub_open(struct inode *inode, struct file *filp) 823{ 824 const struct file_operations *new_fops; 825 struct drm_minor *minor; 826 int err; 827 828 DRM_DEBUG("\n"); 829 830 mutex_lock(&drm_global_mutex); 831 minor = drm_minor_acquire(iminor(inode)); 832 if (IS_ERR(minor)) { 833 err = PTR_ERR(minor); 834 goto out_unlock; 835 } 836 837 new_fops = fops_get(minor->dev->driver->fops); 838 if (!new_fops) { 839 err = -ENODEV; 840 goto out_release; 841 } 842 843 replace_fops(filp, new_fops); 844 if (filp->f_op->open) 845 err = filp->f_op->open(inode, filp); 846 else 847 err = 0; 848 849out_release: 850 drm_minor_release(minor); 851out_unlock: 852 mutex_unlock(&drm_global_mutex); 853 return err; 854} 855 856static const struct file_operations drm_stub_fops = { 857 .owner = THIS_MODULE, 858 .open = drm_stub_open, 859 .llseek = noop_llseek, 860}; 861 862static int __init drm_core_init(void) 863{ 864 int ret = -ENOMEM; 865 866 drm_global_init(); 867 drm_connector_ida_init(); 868 idr_init(&drm_minors_idr); 869 870 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 871 goto err_p1; 872 873 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 874 if (IS_ERR(drm_class)) { 875 printk(KERN_ERR "DRM: Error creating drm class.\n"); 876 ret = PTR_ERR(drm_class); 877 goto err_p2; 878 } 879 880 drm_debugfs_root = debugfs_create_dir("dri", NULL); 881 if (!drm_debugfs_root) { 882 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 883 ret = -1; 884 goto err_p3; 885 } 886 887 DRM_INFO("Initialized %s %d.%d.%d %s\n", 888 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 889 return 0; 890err_p3: 891 drm_sysfs_destroy(); 892err_p2: 893 unregister_chrdev(DRM_MAJOR, "drm"); 894 895 idr_destroy(&drm_minors_idr); 896err_p1: 897 return ret; 898} 899 900static void __exit drm_core_exit(void) 901{ 902 debugfs_remove(drm_debugfs_root); 903 drm_sysfs_destroy(); 904 905 unregister_chrdev(DRM_MAJOR, "drm"); 906 907 drm_connector_ida_destroy(); 908 idr_destroy(&drm_minors_idr); 909} 910 911module_init(drm_core_init); 912module_exit(drm_core_exit); 913