2 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
4 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
7 * Author Rickard E. (Rik) Faith <faith@valinux.com>
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:
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
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.
29 #include <linux/debugfs.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/mount.h>
34 #include <linux/slab.h>
36 #include <drm/drm_core.h>
37 #include "drm_legacy.h"
38 #include "drm_internal.h"
40 unsigned int drm_debug = 0; /* bitmask of DRM_UT_x */
41 EXPORT_SYMBOL(drm_debug);
43 MODULE_AUTHOR(CORE_AUTHOR);
44 MODULE_DESCRIPTION(CORE_DESC);
45 MODULE_LICENSE("GPL and additional rights");
46 MODULE_PARM_DESC(debug, "Enable debug output");
47 MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)");
48 MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
49 MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
51 module_param_named(debug, drm_debug, int, 0600);
53 static DEFINE_SPINLOCK(drm_minor_lock);
54 static struct idr drm_minors_idr;
56 static struct dentry *drm_debugfs_root;
58 void drm_err(const char *format, ...)
63 va_start(args, format);
68 printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
69 __builtin_return_address(0), &vaf);
73 EXPORT_SYMBOL(drm_err);
75 void drm_ut_debug_printk(const char *function_name, const char *format, ...)
80 va_start(args, format);
84 printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf);
88 EXPORT_SYMBOL(drm_ut_debug_printk);
90 struct drm_master *drm_master_create(struct drm_minor *minor)
92 struct drm_master *master;
94 master = kzalloc(sizeof(*master), GFP_KERNEL);
98 kref_init(&master->refcount);
99 spin_lock_init(&master->lock.spinlock);
100 init_waitqueue_head(&master->lock.lock_queue);
101 idr_init(&master->magic_map);
102 master->minor = minor;
107 struct drm_master *drm_master_get(struct drm_master *master)
109 kref_get(&master->refcount);
112 EXPORT_SYMBOL(drm_master_get);
114 static void drm_master_destroy(struct kref *kref)
116 struct drm_master *master = container_of(kref, struct drm_master, refcount);
117 struct drm_device *dev = master->minor->dev;
118 struct drm_map_list *r_list, *list_temp;
120 mutex_lock(&dev->struct_mutex);
121 if (dev->driver->master_destroy)
122 dev->driver->master_destroy(dev, master);
124 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
125 if (r_list->master == master) {
126 drm_legacy_rmmap_locked(dev, r_list->map);
130 mutex_unlock(&dev->struct_mutex);
132 idr_destroy(&master->magic_map);
133 kfree(master->unique);
137 void drm_master_put(struct drm_master **master)
139 kref_put(&(*master)->refcount, drm_master_destroy);
142 EXPORT_SYMBOL(drm_master_put);
144 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
145 struct drm_file *file_priv)
149 mutex_lock(&dev->master_mutex);
150 if (file_priv->is_master)
153 if (file_priv->minor->master) {
158 if (!file_priv->master) {
163 file_priv->minor->master = drm_master_get(file_priv->master);
164 file_priv->is_master = 1;
165 if (dev->driver->master_set) {
166 ret = dev->driver->master_set(dev, file_priv, false);
167 if (unlikely(ret != 0)) {
168 file_priv->is_master = 0;
169 drm_master_put(&file_priv->minor->master);
174 mutex_unlock(&dev->master_mutex);
178 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
179 struct drm_file *file_priv)
183 mutex_lock(&dev->master_mutex);
184 if (!file_priv->is_master)
187 if (!file_priv->minor->master)
191 if (dev->driver->master_drop)
192 dev->driver->master_drop(dev, file_priv, false);
193 drm_master_put(&file_priv->minor->master);
194 file_priv->is_master = 0;
197 mutex_unlock(&dev->master_mutex);
203 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
204 * of them is represented by a drm_minor object. Depending on the capabilities
205 * of the device-driver, different interfaces are registered.
207 * Minors can be accessed via dev->$minor_name. This pointer is either
208 * NULL or a valid drm_minor pointer and stays valid as long as the device is
209 * valid. This means, DRM minors have the same life-time as the underlying
210 * device. However, this doesn't mean that the minor is active. Minors are
211 * registered and unregistered dynamically according to device-state.
214 static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
218 case DRM_MINOR_LEGACY:
219 return &dev->primary;
220 case DRM_MINOR_RENDER:
222 case DRM_MINOR_CONTROL:
223 return &dev->control;
229 static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
231 struct drm_minor *minor;
235 minor = kzalloc(sizeof(*minor), GFP_KERNEL);
242 idr_preload(GFP_KERNEL);
243 spin_lock_irqsave(&drm_minor_lock, flags);
244 r = idr_alloc(&drm_minors_idr,
249 spin_unlock_irqrestore(&drm_minor_lock, flags);
257 minor->kdev = drm_sysfs_minor_alloc(minor);
258 if (IS_ERR(minor->kdev)) {
259 r = PTR_ERR(minor->kdev);
263 *drm_minor_get_slot(dev, type) = minor;
267 spin_lock_irqsave(&drm_minor_lock, flags);
268 idr_remove(&drm_minors_idr, minor->index);
269 spin_unlock_irqrestore(&drm_minor_lock, flags);
275 static void drm_minor_free(struct drm_device *dev, unsigned int type)
277 struct drm_minor **slot, *minor;
280 slot = drm_minor_get_slot(dev, type);
285 put_device(minor->kdev);
287 spin_lock_irqsave(&drm_minor_lock, flags);
288 idr_remove(&drm_minors_idr, minor->index);
289 spin_unlock_irqrestore(&drm_minor_lock, flags);
295 static int drm_minor_register(struct drm_device *dev, unsigned int type)
297 struct drm_minor *minor;
303 minor = *drm_minor_get_slot(dev, type);
307 ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
309 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
313 ret = device_add(minor->kdev);
317 /* replace NULL with @minor so lookups will succeed from now on */
318 spin_lock_irqsave(&drm_minor_lock, flags);
319 idr_replace(&drm_minors_idr, minor, minor->index);
320 spin_unlock_irqrestore(&drm_minor_lock, flags);
322 DRM_DEBUG("new minor registered %d\n", minor->index);
326 drm_debugfs_cleanup(minor);
330 static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
332 struct drm_minor *minor;
335 minor = *drm_minor_get_slot(dev, type);
336 if (!minor || !device_is_registered(minor->kdev))
339 /* replace @minor with NULL so lookups will fail from now on */
340 spin_lock_irqsave(&drm_minor_lock, flags);
341 idr_replace(&drm_minors_idr, NULL, minor->index);
342 spin_unlock_irqrestore(&drm_minor_lock, flags);
344 device_del(minor->kdev);
345 dev_set_drvdata(minor->kdev, NULL); /* safety belt */
346 drm_debugfs_cleanup(minor);
350 * drm_minor_acquire - Acquire a DRM minor
351 * @minor_id: Minor ID of the DRM-minor
353 * Looks up the given minor-ID and returns the respective DRM-minor object. The
354 * refence-count of the underlying device is increased so you must release this
355 * object with drm_minor_release().
357 * As long as you hold this minor, it is guaranteed that the object and the
358 * minor->dev pointer will stay valid! However, the device may get unplugged and
359 * unregistered while you hold the minor.
362 * Pointer to minor-object with increased device-refcount, or PTR_ERR on
365 struct drm_minor *drm_minor_acquire(unsigned int minor_id)
367 struct drm_minor *minor;
370 spin_lock_irqsave(&drm_minor_lock, flags);
371 minor = idr_find(&drm_minors_idr, minor_id);
373 drm_dev_ref(minor->dev);
374 spin_unlock_irqrestore(&drm_minor_lock, flags);
377 return ERR_PTR(-ENODEV);
378 } else if (drm_device_is_unplugged(minor->dev)) {
379 drm_dev_unref(minor->dev);
380 return ERR_PTR(-ENODEV);
387 * drm_minor_release - Release DRM minor
388 * @minor: Pointer to DRM minor object
390 * Release a minor that was previously acquired via drm_minor_acquire().
392 void drm_minor_release(struct drm_minor *minor)
394 drm_dev_unref(minor->dev);
398 * DOC: driver instance overview
400 * A device instance for a drm driver is represented by struct &drm_device. This
401 * is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
402 * callbacks implemented by the driver. The driver then needs to initialize all
403 * the various subsystems for the drm device like memory management, vblank
404 * handling, modesetting support and intial output configuration plus obviously
405 * initialize all the corresponding hardware bits. An important part of this is
406 * also calling drm_dev_set_unique() to set the userspace-visible unique name of
407 * this device instance. Finally when everything is up and running and ready for
408 * userspace the device instance can be published using drm_dev_register().
410 * There is also deprecated support for initalizing device instances using
411 * bus-specific helpers and the ->load() callback. But due to
412 * backwards-compatibility needs the device instance have to be published too
413 * early, which requires unpretty global locking to make safe and is therefore
414 * only support for existing drivers not yet converted to the new scheme.
416 * When cleaning up a device instance everything needs to be done in reverse:
417 * First unpublish the device instance with drm_dev_unregister(). Then clean up
418 * any other resources allocated at device initialization and drop the driver's
419 * reference to &drm_device using drm_dev_unref().
421 * Note that the lifetime rules for &drm_device instance has still a lot of
422 * historical baggage. Hence use the reference counting provided by
423 * drm_dev_ref() and drm_dev_unref() only carefully.
425 * Also note that embedding of &drm_device is currently not (yet) supported (but
426 * it would be easy to add). Drivers can store driver-private data in the
427 * dev_priv field of &drm_device.
431 * drm_put_dev - Unregister and release a DRM device
434 * Called at module unload time or when a PCI device is unplugged.
436 * Cleans up all DRM device, calling drm_lastclose().
438 * Note: Use of this function is deprecated. It will eventually go away
439 * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
440 * instead to make sure that the device isn't userspace accessible any more
441 * while teardown is in progress, ensuring that userspace can't access an
442 * inconsistent state.
444 void drm_put_dev(struct drm_device *dev)
449 DRM_ERROR("cleanup called no dev\n");
453 drm_dev_unregister(dev);
456 EXPORT_SYMBOL(drm_put_dev);
458 void drm_unplug_dev(struct drm_device *dev)
460 /* for a USB device */
461 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
462 drm_minor_unregister(dev, DRM_MINOR_RENDER);
463 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
465 mutex_lock(&drm_global_mutex);
467 drm_device_set_unplugged(dev);
469 if (dev->open_count == 0) {
472 mutex_unlock(&drm_global_mutex);
474 EXPORT_SYMBOL(drm_unplug_dev);
478 * We want to be able to allocate our own "struct address_space" to control
479 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
480 * stand-alone address_space objects, so we need an underlying inode. As there
481 * is no way to allocate an independent inode easily, we need a fake internal
484 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
485 * frees it again. You are allowed to use iget() and iput() to get references to
486 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
487 * drm_fs_inode_free() call (which does not have to be the last iput()).
488 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
489 * between multiple inode-users. You could, technically, call
490 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
491 * iput(), but this way you'd end up with a new vfsmount for each inode.
494 static int drm_fs_cnt;
495 static struct vfsmount *drm_fs_mnt;
497 static const struct dentry_operations drm_fs_dops = {
498 .d_dname = simple_dname,
501 static const struct super_operations drm_fs_sops = {
502 .statfs = simple_statfs,
505 static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
506 const char *dev_name, void *data)
508 return mount_pseudo(fs_type,
515 static struct file_system_type drm_fs_type = {
517 .owner = THIS_MODULE,
518 .mount = drm_fs_mount,
519 .kill_sb = kill_anon_super,
522 static struct inode *drm_fs_inode_new(void)
527 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
529 DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
533 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
535 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
540 static void drm_fs_inode_free(struct inode *inode)
544 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
549 * drm_dev_alloc - Allocate new DRM device
550 * @driver: DRM driver to allocate device for
551 * @parent: Parent device object
553 * Allocate and initialize a new DRM device. No device registration is done.
554 * Call drm_dev_register() to advertice the device to user space and register it
555 * with other core subsystems. This should be done last in the device
556 * initialization sequence to make sure userspace can't access an inconsistent
559 * The initial ref-count of the object is 1. Use drm_dev_ref() and
560 * drm_dev_unref() to take and drop further ref-counts.
562 * Note that for purely virtual devices @parent can be NULL.
565 * Pointer to new DRM device, or NULL if out of memory.
567 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
568 struct device *parent)
570 struct drm_device *dev;
573 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
577 kref_init(&dev->ref);
579 dev->driver = driver;
581 INIT_LIST_HEAD(&dev->filelist);
582 INIT_LIST_HEAD(&dev->ctxlist);
583 INIT_LIST_HEAD(&dev->vmalist);
584 INIT_LIST_HEAD(&dev->maplist);
585 INIT_LIST_HEAD(&dev->vblank_event_list);
587 spin_lock_init(&dev->buf_lock);
588 spin_lock_init(&dev->event_lock);
589 mutex_init(&dev->struct_mutex);
590 mutex_init(&dev->ctxlist_mutex);
591 mutex_init(&dev->master_mutex);
593 dev->anon_inode = drm_fs_inode_new();
594 if (IS_ERR(dev->anon_inode)) {
595 ret = PTR_ERR(dev->anon_inode);
596 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
600 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
601 ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL);
605 WARN_ON(driver->suspend || driver->resume);
608 if (drm_core_check_feature(dev, DRIVER_RENDER)) {
609 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
614 ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY);
618 if (drm_ht_create(&dev->map_hash, 12))
621 drm_legacy_ctxbitmap_init(dev);
623 if (drm_core_check_feature(dev, DRIVER_GEM)) {
624 ret = drm_gem_init(dev);
626 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
634 drm_legacy_ctxbitmap_cleanup(dev);
635 drm_ht_remove(&dev->map_hash);
637 drm_minor_free(dev, DRM_MINOR_LEGACY);
638 drm_minor_free(dev, DRM_MINOR_RENDER);
639 drm_minor_free(dev, DRM_MINOR_CONTROL);
640 drm_fs_inode_free(dev->anon_inode);
642 mutex_destroy(&dev->master_mutex);
646 EXPORT_SYMBOL(drm_dev_alloc);
648 static void drm_dev_release(struct kref *ref)
650 struct drm_device *dev = container_of(ref, struct drm_device, ref);
652 if (drm_core_check_feature(dev, DRIVER_GEM))
653 drm_gem_destroy(dev);
655 drm_legacy_ctxbitmap_cleanup(dev);
656 drm_ht_remove(&dev->map_hash);
657 drm_fs_inode_free(dev->anon_inode);
659 drm_minor_free(dev, DRM_MINOR_LEGACY);
660 drm_minor_free(dev, DRM_MINOR_RENDER);
661 drm_minor_free(dev, DRM_MINOR_CONTROL);
663 mutex_destroy(&dev->master_mutex);
669 * drm_dev_ref - Take reference of a DRM device
670 * @dev: device to take reference of or NULL
672 * This increases the ref-count of @dev by one. You *must* already own a
673 * reference when calling this. Use drm_dev_unref() to drop this reference
676 * This function never fails. However, this function does not provide *any*
677 * guarantee whether the device is alive or running. It only provides a
678 * reference to the object and the memory associated with it.
680 void drm_dev_ref(struct drm_device *dev)
685 EXPORT_SYMBOL(drm_dev_ref);
688 * drm_dev_unref - Drop reference of a DRM device
689 * @dev: device to drop reference of or NULL
691 * This decreases the ref-count of @dev by one. The device is destroyed if the
692 * ref-count drops to zero.
694 void drm_dev_unref(struct drm_device *dev)
697 kref_put(&dev->ref, drm_dev_release);
699 EXPORT_SYMBOL(drm_dev_unref);
702 * drm_dev_register - Register DRM device
703 * @dev: Device to register
704 * @flags: Flags passed to the driver's .load() function
706 * Register the DRM device @dev with the system, advertise device to user-space
707 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
710 * Never call this twice on any device!
712 * NOTE: To ensure backward compatibility with existing drivers method this
713 * function calls the ->load() method after registering the device nodes,
714 * creating race conditions. Usage of the ->load() methods is therefore
715 * deprecated, drivers must perform all initialization before calling
716 * drm_dev_register().
719 * 0 on success, negative error code on failure.
721 int drm_dev_register(struct drm_device *dev, unsigned long flags)
725 mutex_lock(&drm_global_mutex);
727 ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
731 ret = drm_minor_register(dev, DRM_MINOR_RENDER);
735 ret = drm_minor_register(dev, DRM_MINOR_LEGACY);
739 if (dev->driver->load) {
740 ret = dev->driver->load(dev, flags);
749 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
750 drm_minor_unregister(dev, DRM_MINOR_RENDER);
751 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
753 mutex_unlock(&drm_global_mutex);
756 EXPORT_SYMBOL(drm_dev_register);
759 * drm_dev_unregister - Unregister DRM device
760 * @dev: Device to unregister
762 * Unregister the DRM device from the system. This does the reverse of
763 * drm_dev_register() but does not deallocate the device. The caller must call
764 * drm_dev_unref() to drop their final reference.
766 * This should be called first in the device teardown code to make sure
767 * userspace can't access the device instance any more.
769 void drm_dev_unregister(struct drm_device *dev)
771 struct drm_map_list *r_list, *list_temp;
775 if (dev->driver->unload)
776 dev->driver->unload(dev);
779 drm_pci_agp_destroy(dev);
781 drm_vblank_cleanup(dev);
783 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
784 drm_legacy_rmmap(dev, r_list->map);
786 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
787 drm_minor_unregister(dev, DRM_MINOR_RENDER);
788 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
790 EXPORT_SYMBOL(drm_dev_unregister);
793 * drm_dev_set_unique - Set the unique name of a DRM device
794 * @dev: device of which to set the unique name
795 * @fmt: format string for unique name
797 * Sets the unique name of a DRM device using the specified format string and
798 * a variable list of arguments. Drivers can use this at driver probe time if
799 * the unique name of the devices they drive is static.
801 * Return: 0 on success or a negative error code on failure.
803 int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...)
810 dev->unique = kvasprintf(GFP_KERNEL, fmt, ap);
813 return dev->unique ? 0 : -ENOMEM;
815 EXPORT_SYMBOL(drm_dev_set_unique);
819 * The DRM core module initializes all global DRM objects and makes them
820 * available to drivers. Once setup, drivers can probe their respective
822 * Currently, core management includes:
823 * - The "DRM-Global" key/value database
824 * - Global ID management for connectors
825 * - DRM major number allocation
826 * - DRM minor management
830 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
831 * interface registered on a DRM device, you can request minor numbers from DRM
832 * core. DRM core takes care of major-number management and char-dev
833 * registration. A stub ->open() callback forwards any open() requests to the
837 static int drm_stub_open(struct inode *inode, struct file *filp)
839 const struct file_operations *new_fops;
840 struct drm_minor *minor;
845 mutex_lock(&drm_global_mutex);
846 minor = drm_minor_acquire(iminor(inode));
848 err = PTR_ERR(minor);
852 new_fops = fops_get(minor->dev->driver->fops);
858 replace_fops(filp, new_fops);
859 if (filp->f_op->open)
860 err = filp->f_op->open(inode, filp);
865 drm_minor_release(minor);
867 mutex_unlock(&drm_global_mutex);
871 static const struct file_operations drm_stub_fops = {
872 .owner = THIS_MODULE,
873 .open = drm_stub_open,
874 .llseek = noop_llseek,
877 static int __init drm_core_init(void)
882 drm_connector_ida_init();
883 idr_init(&drm_minors_idr);
885 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
888 ret = drm_sysfs_init();
890 printk(KERN_ERR "DRM: Error creating drm class.\n");
894 drm_debugfs_root = debugfs_create_dir("dri", NULL);
895 if (!drm_debugfs_root) {
896 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
901 DRM_INFO("Initialized %s %d.%d.%d %s\n",
902 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
907 unregister_chrdev(DRM_MAJOR, "drm");
909 idr_destroy(&drm_minors_idr);
914 static void __exit drm_core_exit(void)
916 debugfs_remove(drm_debugfs_root);
919 unregister_chrdev(DRM_MAJOR, "drm");
921 drm_connector_ida_destroy();
922 idr_destroy(&drm_minors_idr);
925 module_init(drm_core_init);
926 module_exit(drm_core_exit);