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