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 #define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV"
60 void drm_dev_printk(const struct device *dev, const char *level,
61 unsigned int category, const char *function_name,
62 const char *prefix, const char *format, ...)
67 if (category != DRM_UT_NONE && !(drm_debug & category))
70 va_start(args, format);
74 dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix,
79 EXPORT_SYMBOL(drm_dev_printk);
81 void drm_printk(const char *level, unsigned int category,
82 const char *function_name, const char *prefix,
83 const char *format, ...)
88 if (category != DRM_UT_NONE && !(drm_debug & category))
91 va_start(args, format);
95 printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf);
99 EXPORT_SYMBOL(drm_printk);
101 struct drm_master *drm_master_create(struct drm_minor *minor)
103 struct drm_master *master;
105 master = kzalloc(sizeof(*master), GFP_KERNEL);
109 kref_init(&master->refcount);
110 spin_lock_init(&master->lock.spinlock);
111 init_waitqueue_head(&master->lock.lock_queue);
112 idr_init(&master->magic_map);
113 master->minor = minor;
118 struct drm_master *drm_master_get(struct drm_master *master)
120 kref_get(&master->refcount);
123 EXPORT_SYMBOL(drm_master_get);
125 static void drm_master_destroy(struct kref *kref)
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;
131 mutex_lock(&dev->struct_mutex);
132 if (dev->driver->master_destroy)
133 dev->driver->master_destroy(dev, master);
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);
141 mutex_unlock(&dev->struct_mutex);
143 idr_destroy(&master->magic_map);
144 kfree(master->unique);
148 void drm_master_put(struct drm_master **master)
150 kref_put(&(*master)->refcount, drm_master_destroy);
153 EXPORT_SYMBOL(drm_master_put);
155 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
156 struct drm_file *file_priv)
160 mutex_lock(&dev->master_mutex);
161 if (file_priv->is_master)
164 if (file_priv->minor->master) {
169 if (!file_priv->master) {
174 if (!file_priv->allowed_master) {
175 ret = drm_new_set_master(dev, file_priv);
179 file_priv->minor->master = drm_master_get(file_priv->master);
180 file_priv->is_master = 1;
181 if (dev->driver->master_set) {
182 ret = dev->driver->master_set(dev, file_priv, false);
183 if (unlikely(ret != 0)) {
184 file_priv->is_master = 0;
185 drm_master_put(&file_priv->minor->master);
190 mutex_unlock(&dev->master_mutex);
194 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
195 struct drm_file *file_priv)
199 mutex_lock(&dev->master_mutex);
200 if (!file_priv->is_master)
203 if (!file_priv->minor->master)
207 if (dev->driver->master_drop)
208 dev->driver->master_drop(dev, file_priv, false);
209 drm_master_put(&file_priv->minor->master);
210 file_priv->is_master = 0;
213 mutex_unlock(&dev->master_mutex);
219 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
220 * of them is represented by a drm_minor object. Depending on the capabilities
221 * of the device-driver, different interfaces are registered.
223 * Minors can be accessed via dev->$minor_name. This pointer is either
224 * NULL or a valid drm_minor pointer and stays valid as long as the device is
225 * valid. This means, DRM minors have the same life-time as the underlying
226 * device. However, this doesn't mean that the minor is active. Minors are
227 * registered and unregistered dynamically according to device-state.
230 static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
234 case DRM_MINOR_LEGACY:
235 return &dev->primary;
236 case DRM_MINOR_RENDER:
238 case DRM_MINOR_CONTROL:
239 return &dev->control;
245 static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
247 struct drm_minor *minor;
251 minor = kzalloc(sizeof(*minor), GFP_KERNEL);
258 idr_preload(GFP_KERNEL);
259 spin_lock_irqsave(&drm_minor_lock, flags);
260 r = idr_alloc(&drm_minors_idr,
265 spin_unlock_irqrestore(&drm_minor_lock, flags);
273 minor->kdev = drm_sysfs_minor_alloc(minor);
274 if (IS_ERR(minor->kdev)) {
275 r = PTR_ERR(minor->kdev);
279 *drm_minor_get_slot(dev, type) = minor;
283 spin_lock_irqsave(&drm_minor_lock, flags);
284 idr_remove(&drm_minors_idr, minor->index);
285 spin_unlock_irqrestore(&drm_minor_lock, flags);
291 static void drm_minor_free(struct drm_device *dev, unsigned int type)
293 struct drm_minor **slot, *minor;
296 slot = drm_minor_get_slot(dev, type);
301 put_device(minor->kdev);
303 spin_lock_irqsave(&drm_minor_lock, flags);
304 idr_remove(&drm_minors_idr, minor->index);
305 spin_unlock_irqrestore(&drm_minor_lock, flags);
311 static int drm_minor_register(struct drm_device *dev, unsigned int type)
313 struct drm_minor *minor;
319 minor = *drm_minor_get_slot(dev, type);
323 ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
325 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
329 ret = device_add(minor->kdev);
333 /* replace NULL with @minor so lookups will succeed from now on */
334 spin_lock_irqsave(&drm_minor_lock, flags);
335 idr_replace(&drm_minors_idr, minor, minor->index);
336 spin_unlock_irqrestore(&drm_minor_lock, flags);
338 DRM_DEBUG("new minor registered %d\n", minor->index);
342 drm_debugfs_cleanup(minor);
346 static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
348 struct drm_minor *minor;
351 minor = *drm_minor_get_slot(dev, type);
352 if (!minor || !device_is_registered(minor->kdev))
355 /* replace @minor with NULL so lookups will fail from now on */
356 spin_lock_irqsave(&drm_minor_lock, flags);
357 idr_replace(&drm_minors_idr, NULL, minor->index);
358 spin_unlock_irqrestore(&drm_minor_lock, flags);
360 device_del(minor->kdev);
361 dev_set_drvdata(minor->kdev, NULL); /* safety belt */
362 drm_debugfs_cleanup(minor);
366 * drm_minor_acquire - Acquire a DRM minor
367 * @minor_id: Minor ID of the DRM-minor
369 * Looks up the given minor-ID and returns the respective DRM-minor object. The
370 * refence-count of the underlying device is increased so you must release this
371 * object with drm_minor_release().
373 * As long as you hold this minor, it is guaranteed that the object and the
374 * minor->dev pointer will stay valid! However, the device may get unplugged and
375 * unregistered while you hold the minor.
378 * Pointer to minor-object with increased device-refcount, or PTR_ERR on
381 struct drm_minor *drm_minor_acquire(unsigned int minor_id)
383 struct drm_minor *minor;
386 spin_lock_irqsave(&drm_minor_lock, flags);
387 minor = idr_find(&drm_minors_idr, minor_id);
389 drm_dev_ref(minor->dev);
390 spin_unlock_irqrestore(&drm_minor_lock, flags);
393 return ERR_PTR(-ENODEV);
394 } else if (drm_device_is_unplugged(minor->dev)) {
395 drm_dev_unref(minor->dev);
396 return ERR_PTR(-ENODEV);
403 * drm_minor_release - Release DRM minor
404 * @minor: Pointer to DRM minor object
406 * Release a minor that was previously acquired via drm_minor_acquire().
408 void drm_minor_release(struct drm_minor *minor)
410 drm_dev_unref(minor->dev);
414 * DOC: driver instance overview
416 * A device instance for a drm driver is represented by struct &drm_device. This
417 * is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
418 * callbacks implemented by the driver. The driver then needs to initialize all
419 * the various subsystems for the drm device like memory management, vblank
420 * handling, modesetting support and intial output configuration plus obviously
421 * initialize all the corresponding hardware bits. An important part of this is
422 * also calling drm_dev_set_unique() to set the userspace-visible unique name of
423 * this device instance. Finally when everything is up and running and ready for
424 * userspace the device instance can be published using drm_dev_register().
426 * There is also deprecated support for initalizing device instances using
427 * bus-specific helpers and the ->load() callback. But due to
428 * backwards-compatibility needs the device instance have to be published too
429 * early, which requires unpretty global locking to make safe and is therefore
430 * only support for existing drivers not yet converted to the new scheme.
432 * When cleaning up a device instance everything needs to be done in reverse:
433 * First unpublish the device instance with drm_dev_unregister(). Then clean up
434 * any other resources allocated at device initialization and drop the driver's
435 * reference to &drm_device using drm_dev_unref().
437 * Note that the lifetime rules for &drm_device instance has still a lot of
438 * historical baggage. Hence use the reference counting provided by
439 * drm_dev_ref() and drm_dev_unref() only carefully.
441 * Also note that embedding of &drm_device is currently not (yet) supported (but
442 * it would be easy to add). Drivers can store driver-private data in the
443 * dev_priv field of &drm_device.
447 * drm_put_dev - Unregister and release a DRM device
450 * Called at module unload time or when a PCI device is unplugged.
452 * Cleans up all DRM device, calling drm_lastclose().
454 * Note: Use of this function is deprecated. It will eventually go away
455 * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
456 * instead to make sure that the device isn't userspace accessible any more
457 * while teardown is in progress, ensuring that userspace can't access an
458 * inconsistent state.
460 void drm_put_dev(struct drm_device *dev)
465 DRM_ERROR("cleanup called no dev\n");
469 drm_dev_unregister(dev);
472 EXPORT_SYMBOL(drm_put_dev);
474 void drm_unplug_dev(struct drm_device *dev)
476 /* for a USB device */
477 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
478 drm_minor_unregister(dev, DRM_MINOR_RENDER);
479 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
481 mutex_lock(&drm_global_mutex);
483 drm_device_set_unplugged(dev);
485 if (dev->open_count == 0) {
488 mutex_unlock(&drm_global_mutex);
490 EXPORT_SYMBOL(drm_unplug_dev);
494 * We want to be able to allocate our own "struct address_space" to control
495 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
496 * stand-alone address_space objects, so we need an underlying inode. As there
497 * is no way to allocate an independent inode easily, we need a fake internal
500 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
501 * frees it again. You are allowed to use iget() and iput() to get references to
502 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
503 * drm_fs_inode_free() call (which does not have to be the last iput()).
504 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
505 * between multiple inode-users. You could, technically, call
506 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
507 * iput(), but this way you'd end up with a new vfsmount for each inode.
510 static int drm_fs_cnt;
511 static struct vfsmount *drm_fs_mnt;
513 static const struct dentry_operations drm_fs_dops = {
514 .d_dname = simple_dname,
517 static const struct super_operations drm_fs_sops = {
518 .statfs = simple_statfs,
521 static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
522 const char *dev_name, void *data)
524 return mount_pseudo(fs_type,
531 static struct file_system_type drm_fs_type = {
533 .owner = THIS_MODULE,
534 .mount = drm_fs_mount,
535 .kill_sb = kill_anon_super,
538 static struct inode *drm_fs_inode_new(void)
543 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
545 DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
549 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
551 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
556 static void drm_fs_inode_free(struct inode *inode)
560 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
565 * drm_dev_alloc - Allocate new DRM device
566 * @driver: DRM driver to allocate device for
567 * @parent: Parent device object
569 * Allocate and initialize a new DRM device. No device registration is done.
570 * Call drm_dev_register() to advertice the device to user space and register it
571 * with other core subsystems. This should be done last in the device
572 * initialization sequence to make sure userspace can't access an inconsistent
575 * The initial ref-count of the object is 1. Use drm_dev_ref() and
576 * drm_dev_unref() to take and drop further ref-counts.
578 * Note that for purely virtual devices @parent can be NULL.
581 * Pointer to new DRM device, or NULL if out of memory.
583 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
584 struct device *parent)
586 struct drm_device *dev;
589 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
593 kref_init(&dev->ref);
595 dev->driver = driver;
597 INIT_LIST_HEAD(&dev->filelist);
598 INIT_LIST_HEAD(&dev->ctxlist);
599 INIT_LIST_HEAD(&dev->vmalist);
600 INIT_LIST_HEAD(&dev->maplist);
601 INIT_LIST_HEAD(&dev->vblank_event_list);
603 spin_lock_init(&dev->buf_lock);
604 spin_lock_init(&dev->event_lock);
605 mutex_init(&dev->struct_mutex);
606 mutex_init(&dev->ctxlist_mutex);
607 mutex_init(&dev->master_mutex);
609 dev->anon_inode = drm_fs_inode_new();
610 if (IS_ERR(dev->anon_inode)) {
611 ret = PTR_ERR(dev->anon_inode);
612 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
616 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
617 ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL);
621 WARN_ON(driver->suspend || driver->resume);
624 if (drm_core_check_feature(dev, DRIVER_RENDER)) {
625 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
630 ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY);
634 if (drm_ht_create(&dev->map_hash, 12))
637 drm_legacy_ctxbitmap_init(dev);
639 if (drm_core_check_feature(dev, DRIVER_GEM)) {
640 ret = drm_gem_init(dev);
642 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
650 drm_legacy_ctxbitmap_cleanup(dev);
651 drm_ht_remove(&dev->map_hash);
653 drm_minor_free(dev, DRM_MINOR_LEGACY);
654 drm_minor_free(dev, DRM_MINOR_RENDER);
655 drm_minor_free(dev, DRM_MINOR_CONTROL);
656 drm_fs_inode_free(dev->anon_inode);
658 mutex_destroy(&dev->master_mutex);
662 EXPORT_SYMBOL(drm_dev_alloc);
664 static void drm_dev_release(struct kref *ref)
666 struct drm_device *dev = container_of(ref, struct drm_device, ref);
668 if (drm_core_check_feature(dev, DRIVER_GEM))
669 drm_gem_destroy(dev);
671 drm_legacy_ctxbitmap_cleanup(dev);
672 drm_ht_remove(&dev->map_hash);
673 drm_fs_inode_free(dev->anon_inode);
675 drm_minor_free(dev, DRM_MINOR_LEGACY);
676 drm_minor_free(dev, DRM_MINOR_RENDER);
677 drm_minor_free(dev, DRM_MINOR_CONTROL);
679 mutex_destroy(&dev->master_mutex);
685 * drm_dev_ref - Take reference of a DRM device
686 * @dev: device to take reference of or NULL
688 * This increases the ref-count of @dev by one. You *must* already own a
689 * reference when calling this. Use drm_dev_unref() to drop this reference
692 * This function never fails. However, this function does not provide *any*
693 * guarantee whether the device is alive or running. It only provides a
694 * reference to the object and the memory associated with it.
696 void drm_dev_ref(struct drm_device *dev)
701 EXPORT_SYMBOL(drm_dev_ref);
704 * drm_dev_unref - Drop reference of a DRM device
705 * @dev: device to drop reference of or NULL
707 * This decreases the ref-count of @dev by one. The device is destroyed if the
708 * ref-count drops to zero.
710 void drm_dev_unref(struct drm_device *dev)
713 kref_put(&dev->ref, drm_dev_release);
715 EXPORT_SYMBOL(drm_dev_unref);
718 * drm_dev_register - Register DRM device
719 * @dev: Device to register
720 * @flags: Flags passed to the driver's .load() function
722 * Register the DRM device @dev with the system, advertise device to user-space
723 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
726 * Never call this twice on any device!
728 * NOTE: To ensure backward compatibility with existing drivers method this
729 * function calls the ->load() method after registering the device nodes,
730 * creating race conditions. Usage of the ->load() methods is therefore
731 * deprecated, drivers must perform all initialization before calling
732 * drm_dev_register().
735 * 0 on success, negative error code on failure.
737 int drm_dev_register(struct drm_device *dev, unsigned long flags)
741 mutex_lock(&drm_global_mutex);
743 ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
747 ret = drm_minor_register(dev, DRM_MINOR_RENDER);
751 ret = drm_minor_register(dev, DRM_MINOR_LEGACY);
755 if (dev->driver->load) {
756 ret = dev->driver->load(dev, flags);
765 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
766 drm_minor_unregister(dev, DRM_MINOR_RENDER);
767 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
769 mutex_unlock(&drm_global_mutex);
772 EXPORT_SYMBOL(drm_dev_register);
775 * drm_dev_unregister - Unregister DRM device
776 * @dev: Device to unregister
778 * Unregister the DRM device from the system. This does the reverse of
779 * drm_dev_register() but does not deallocate the device. The caller must call
780 * drm_dev_unref() to drop their final reference.
782 * This should be called first in the device teardown code to make sure
783 * userspace can't access the device instance any more.
785 void drm_dev_unregister(struct drm_device *dev)
787 struct drm_map_list *r_list, *list_temp;
791 if (dev->driver->unload)
792 dev->driver->unload(dev);
795 drm_pci_agp_destroy(dev);
797 drm_vblank_cleanup(dev);
799 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
800 drm_legacy_rmmap(dev, r_list->map);
802 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
803 drm_minor_unregister(dev, DRM_MINOR_RENDER);
804 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
806 EXPORT_SYMBOL(drm_dev_unregister);
809 * drm_dev_set_unique - Set the unique name of a DRM device
810 * @dev: device of which to set the unique name
811 * @fmt: format string for unique name
813 * Sets the unique name of a DRM device using the specified format string and
814 * a variable list of arguments. Drivers can use this at driver probe time if
815 * the unique name of the devices they drive is static.
817 * Return: 0 on success or a negative error code on failure.
819 int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...)
826 dev->unique = kvasprintf(GFP_KERNEL, fmt, ap);
829 return dev->unique ? 0 : -ENOMEM;
831 EXPORT_SYMBOL(drm_dev_set_unique);
835 * The DRM core module initializes all global DRM objects and makes them
836 * available to drivers. Once setup, drivers can probe their respective
838 * Currently, core management includes:
839 * - The "DRM-Global" key/value database
840 * - Global ID management for connectors
841 * - DRM major number allocation
842 * - DRM minor management
846 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
847 * interface registered on a DRM device, you can request minor numbers from DRM
848 * core. DRM core takes care of major-number management and char-dev
849 * registration. A stub ->open() callback forwards any open() requests to the
853 static int drm_stub_open(struct inode *inode, struct file *filp)
855 const struct file_operations *new_fops;
856 struct drm_minor *minor;
861 mutex_lock(&drm_global_mutex);
862 minor = drm_minor_acquire(iminor(inode));
864 err = PTR_ERR(minor);
868 new_fops = fops_get(minor->dev->driver->fops);
874 replace_fops(filp, new_fops);
875 if (filp->f_op->open)
876 err = filp->f_op->open(inode, filp);
881 drm_minor_release(minor);
883 mutex_unlock(&drm_global_mutex);
887 static const struct file_operations drm_stub_fops = {
888 .owner = THIS_MODULE,
889 .open = drm_stub_open,
890 .llseek = noop_llseek,
893 static int __init drm_core_init(void)
898 drm_connector_ida_init();
899 idr_init(&drm_minors_idr);
901 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
904 ret = drm_sysfs_init();
906 printk(KERN_ERR "DRM: Error creating drm class.\n");
910 drm_debugfs_root = debugfs_create_dir("dri", NULL);
911 if (!drm_debugfs_root) {
912 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
917 DRM_INFO("Initialized %s %d.%d.%d %s\n",
918 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
923 unregister_chrdev(DRM_MAJOR, "drm");
925 idr_destroy(&drm_minors_idr);
930 static void __exit drm_core_exit(void)
932 debugfs_remove(drm_debugfs_root);
935 unregister_chrdev(DRM_MAJOR, "drm");
937 drm_connector_ida_destroy();
938 idr_destroy(&drm_minors_idr);
941 module_init(drm_core_init);
942 module_exit(drm_core_exit);