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"
41 * drm_debug: Enable debug output.
42 * Bitmask of DRM_UT_x. See include/drm/drmP.h for details.
44 unsigned int drm_debug
= 0;
45 EXPORT_SYMBOL(drm_debug
);
47 MODULE_AUTHOR(CORE_AUTHOR
);
48 MODULE_DESCRIPTION(CORE_DESC
);
49 MODULE_LICENSE("GPL and additional rights");
50 MODULE_PARM_DESC(debug
, "Enable debug output, where each bit enables a debug category.\n"
51 "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n"
52 "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n"
53 "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n"
54 "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n"
55 "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n"
56 "\t\tBit 5 (0x20) will enable VBL messages (vblank code)");
57 module_param_named(debug
, drm_debug
, int, 0600);
59 static DEFINE_SPINLOCK(drm_minor_lock
);
60 static struct idr drm_minors_idr
;
62 static struct dentry
*drm_debugfs_root
;
64 void drm_err(const char *format
, ...)
69 va_start(args
, format
);
74 printk(KERN_ERR
"[" DRM_NAME
":%ps] *ERROR* %pV",
75 __builtin_return_address(0), &vaf
);
79 EXPORT_SYMBOL(drm_err
);
81 void drm_ut_debug_printk(const char *function_name
, const char *format
, ...)
86 va_start(args
, format
);
90 printk(KERN_DEBUG
"[" DRM_NAME
":%s] %pV", function_name
, &vaf
);
94 EXPORT_SYMBOL(drm_ut_debug_printk
);
98 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
99 * of them is represented by a drm_minor object. Depending on the capabilities
100 * of the device-driver, different interfaces are registered.
102 * Minors can be accessed via dev->$minor_name. This pointer is either
103 * NULL or a valid drm_minor pointer and stays valid as long as the device is
104 * valid. This means, DRM minors have the same life-time as the underlying
105 * device. However, this doesn't mean that the minor is active. Minors are
106 * registered and unregistered dynamically according to device-state.
109 static struct drm_minor
**drm_minor_get_slot(struct drm_device
*dev
,
113 case DRM_MINOR_LEGACY
:
114 return &dev
->primary
;
115 case DRM_MINOR_RENDER
:
117 case DRM_MINOR_CONTROL
:
118 return &dev
->control
;
124 static int drm_minor_alloc(struct drm_device
*dev
, unsigned int type
)
126 struct drm_minor
*minor
;
130 minor
= kzalloc(sizeof(*minor
), GFP_KERNEL
);
137 idr_preload(GFP_KERNEL
);
138 spin_lock_irqsave(&drm_minor_lock
, flags
);
139 r
= idr_alloc(&drm_minors_idr
,
144 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
152 minor
->kdev
= drm_sysfs_minor_alloc(minor
);
153 if (IS_ERR(minor
->kdev
)) {
154 r
= PTR_ERR(minor
->kdev
);
158 *drm_minor_get_slot(dev
, type
) = minor
;
162 spin_lock_irqsave(&drm_minor_lock
, flags
);
163 idr_remove(&drm_minors_idr
, minor
->index
);
164 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
170 static void drm_minor_free(struct drm_device
*dev
, unsigned int type
)
172 struct drm_minor
**slot
, *minor
;
175 slot
= drm_minor_get_slot(dev
, type
);
180 put_device(minor
->kdev
);
182 spin_lock_irqsave(&drm_minor_lock
, flags
);
183 idr_remove(&drm_minors_idr
, minor
->index
);
184 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
190 static int drm_minor_register(struct drm_device
*dev
, unsigned int type
)
192 struct drm_minor
*minor
;
198 minor
= *drm_minor_get_slot(dev
, type
);
202 ret
= drm_debugfs_init(minor
, minor
->index
, drm_debugfs_root
);
204 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
208 ret
= device_add(minor
->kdev
);
212 /* replace NULL with @minor so lookups will succeed from now on */
213 spin_lock_irqsave(&drm_minor_lock
, flags
);
214 idr_replace(&drm_minors_idr
, minor
, minor
->index
);
215 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
217 DRM_DEBUG("new minor registered %d\n", minor
->index
);
221 drm_debugfs_cleanup(minor
);
225 static void drm_minor_unregister(struct drm_device
*dev
, unsigned int type
)
227 struct drm_minor
*minor
;
230 minor
= *drm_minor_get_slot(dev
, type
);
231 if (!minor
|| !device_is_registered(minor
->kdev
))
234 /* replace @minor with NULL so lookups will fail from now on */
235 spin_lock_irqsave(&drm_minor_lock
, flags
);
236 idr_replace(&drm_minors_idr
, NULL
, minor
->index
);
237 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
239 device_del(minor
->kdev
);
240 dev_set_drvdata(minor
->kdev
, NULL
); /* safety belt */
241 drm_debugfs_cleanup(minor
);
245 * drm_minor_acquire - Acquire a DRM minor
246 * @minor_id: Minor ID of the DRM-minor
248 * Looks up the given minor-ID and returns the respective DRM-minor object. The
249 * refence-count of the underlying device is increased so you must release this
250 * object with drm_minor_release().
252 * As long as you hold this minor, it is guaranteed that the object and the
253 * minor->dev pointer will stay valid! However, the device may get unplugged and
254 * unregistered while you hold the minor.
257 * Pointer to minor-object with increased device-refcount, or PTR_ERR on
260 struct drm_minor
*drm_minor_acquire(unsigned int minor_id
)
262 struct drm_minor
*minor
;
265 spin_lock_irqsave(&drm_minor_lock
, flags
);
266 minor
= idr_find(&drm_minors_idr
, minor_id
);
268 drm_dev_ref(minor
->dev
);
269 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
272 return ERR_PTR(-ENODEV
);
273 } else if (drm_device_is_unplugged(minor
->dev
)) {
274 drm_dev_unref(minor
->dev
);
275 return ERR_PTR(-ENODEV
);
282 * drm_minor_release - Release DRM minor
283 * @minor: Pointer to DRM minor object
285 * Release a minor that was previously acquired via drm_minor_acquire().
287 void drm_minor_release(struct drm_minor
*minor
)
289 drm_dev_unref(minor
->dev
);
293 * DOC: driver instance overview
295 * A device instance for a drm driver is represented by struct &drm_device. This
296 * is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
297 * callbacks implemented by the driver. The driver then needs to initialize all
298 * the various subsystems for the drm device like memory management, vblank
299 * handling, modesetting support and intial output configuration plus obviously
300 * initialize all the corresponding hardware bits. An important part of this is
301 * also calling drm_dev_set_unique() to set the userspace-visible unique name of
302 * this device instance. Finally when everything is up and running and ready for
303 * userspace the device instance can be published using drm_dev_register().
305 * There is also deprecated support for initalizing device instances using
306 * bus-specific helpers and the ->load() callback. But due to
307 * backwards-compatibility needs the device instance have to be published too
308 * early, which requires unpretty global locking to make safe and is therefore
309 * only support for existing drivers not yet converted to the new scheme.
311 * When cleaning up a device instance everything needs to be done in reverse:
312 * First unpublish the device instance with drm_dev_unregister(). Then clean up
313 * any other resources allocated at device initialization and drop the driver's
314 * reference to &drm_device using drm_dev_unref().
316 * Note that the lifetime rules for &drm_device instance has still a lot of
317 * historical baggage. Hence use the reference counting provided by
318 * drm_dev_ref() and drm_dev_unref() only carefully.
320 * Also note that embedding of &drm_device is currently not (yet) supported (but
321 * it would be easy to add). Drivers can store driver-private data in the
322 * dev_priv field of &drm_device.
326 * drm_put_dev - Unregister and release a DRM device
329 * Called at module unload time or when a PCI device is unplugged.
331 * Cleans up all DRM device, calling drm_lastclose().
333 * Note: Use of this function is deprecated. It will eventually go away
334 * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
335 * instead to make sure that the device isn't userspace accessible any more
336 * while teardown is in progress, ensuring that userspace can't access an
337 * inconsistent state.
339 void drm_put_dev(struct drm_device
*dev
)
344 DRM_ERROR("cleanup called no dev\n");
348 drm_dev_unregister(dev
);
351 EXPORT_SYMBOL(drm_put_dev
);
353 void drm_unplug_dev(struct drm_device
*dev
)
355 /* for a USB device */
356 drm_minor_unregister(dev
, DRM_MINOR_LEGACY
);
357 drm_minor_unregister(dev
, DRM_MINOR_RENDER
);
358 drm_minor_unregister(dev
, DRM_MINOR_CONTROL
);
360 mutex_lock(&drm_global_mutex
);
362 drm_device_set_unplugged(dev
);
364 if (dev
->open_count
== 0) {
367 mutex_unlock(&drm_global_mutex
);
369 EXPORT_SYMBOL(drm_unplug_dev
);
373 * We want to be able to allocate our own "struct address_space" to control
374 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
375 * stand-alone address_space objects, so we need an underlying inode. As there
376 * is no way to allocate an independent inode easily, we need a fake internal
379 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
380 * frees it again. You are allowed to use iget() and iput() to get references to
381 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
382 * drm_fs_inode_free() call (which does not have to be the last iput()).
383 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
384 * between multiple inode-users. You could, technically, call
385 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
386 * iput(), but this way you'd end up with a new vfsmount for each inode.
389 static int drm_fs_cnt
;
390 static struct vfsmount
*drm_fs_mnt
;
392 static const struct dentry_operations drm_fs_dops
= {
393 .d_dname
= simple_dname
,
396 static const struct super_operations drm_fs_sops
= {
397 .statfs
= simple_statfs
,
400 static struct dentry
*drm_fs_mount(struct file_system_type
*fs_type
, int flags
,
401 const char *dev_name
, void *data
)
403 return mount_pseudo(fs_type
,
410 static struct file_system_type drm_fs_type
= {
412 .owner
= THIS_MODULE
,
413 .mount
= drm_fs_mount
,
414 .kill_sb
= kill_anon_super
,
417 static struct inode
*drm_fs_inode_new(void)
422 r
= simple_pin_fs(&drm_fs_type
, &drm_fs_mnt
, &drm_fs_cnt
);
424 DRM_ERROR("Cannot mount pseudo fs: %d\n", r
);
428 inode
= alloc_anon_inode(drm_fs_mnt
->mnt_sb
);
430 simple_release_fs(&drm_fs_mnt
, &drm_fs_cnt
);
435 static void drm_fs_inode_free(struct inode
*inode
)
439 simple_release_fs(&drm_fs_mnt
, &drm_fs_cnt
);
444 * drm_dev_init - Initialise new DRM device
446 * @driver: DRM driver
447 * @parent: Parent device object
449 * Initialize a new DRM device. No device registration is done.
450 * Call drm_dev_register() to advertice the device to user space and register it
451 * with other core subsystems. This should be done last in the device
452 * initialization sequence to make sure userspace can't access an inconsistent
455 * The initial ref-count of the object is 1. Use drm_dev_ref() and
456 * drm_dev_unref() to take and drop further ref-counts.
458 * Note that for purely virtual devices @parent can be NULL.
460 * Drivers that do not want to allocate their own device struct
461 * embedding struct &drm_device can call drm_dev_alloc() instead.
464 * 0 on success, or error code on failure.
466 int drm_dev_init(struct drm_device
*dev
,
467 struct drm_driver
*driver
,
468 struct device
*parent
)
472 kref_init(&dev
->ref
);
474 dev
->driver
= driver
;
476 INIT_LIST_HEAD(&dev
->filelist
);
477 INIT_LIST_HEAD(&dev
->ctxlist
);
478 INIT_LIST_HEAD(&dev
->vmalist
);
479 INIT_LIST_HEAD(&dev
->maplist
);
480 INIT_LIST_HEAD(&dev
->vblank_event_list
);
482 spin_lock_init(&dev
->buf_lock
);
483 spin_lock_init(&dev
->event_lock
);
484 mutex_init(&dev
->struct_mutex
);
485 mutex_init(&dev
->filelist_mutex
);
486 mutex_init(&dev
->ctxlist_mutex
);
487 mutex_init(&dev
->master_mutex
);
489 dev
->anon_inode
= drm_fs_inode_new();
490 if (IS_ERR(dev
->anon_inode
)) {
491 ret
= PTR_ERR(dev
->anon_inode
);
492 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret
);
496 if (drm_core_check_feature(dev
, DRIVER_MODESET
)) {
497 ret
= drm_minor_alloc(dev
, DRM_MINOR_CONTROL
);
502 if (drm_core_check_feature(dev
, DRIVER_RENDER
)) {
503 ret
= drm_minor_alloc(dev
, DRM_MINOR_RENDER
);
508 ret
= drm_minor_alloc(dev
, DRM_MINOR_LEGACY
);
512 ret
= drm_ht_create(&dev
->map_hash
, 12);
516 drm_legacy_ctxbitmap_init(dev
);
518 if (drm_core_check_feature(dev
, DRIVER_GEM
)) {
519 ret
= drm_gem_init(dev
);
521 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
527 ret
= drm_dev_set_unique(dev
, dev_name(parent
));
535 if (drm_core_check_feature(dev
, DRIVER_GEM
))
536 drm_gem_destroy(dev
);
538 drm_legacy_ctxbitmap_cleanup(dev
);
539 drm_ht_remove(&dev
->map_hash
);
541 drm_minor_free(dev
, DRM_MINOR_LEGACY
);
542 drm_minor_free(dev
, DRM_MINOR_RENDER
);
543 drm_minor_free(dev
, DRM_MINOR_CONTROL
);
544 drm_fs_inode_free(dev
->anon_inode
);
546 mutex_destroy(&dev
->master_mutex
);
549 EXPORT_SYMBOL(drm_dev_init
);
552 * drm_dev_alloc - Allocate new DRM device
553 * @driver: DRM driver to allocate device for
554 * @parent: Parent device object
556 * Allocate and initialize a new DRM device. No device registration is done.
557 * Call drm_dev_register() to advertice the device to user space and register it
558 * with other core subsystems. This should be done last in the device
559 * initialization sequence to make sure userspace can't access an inconsistent
562 * The initial ref-count of the object is 1. Use drm_dev_ref() and
563 * drm_dev_unref() to take and drop further ref-counts.
565 * Note that for purely virtual devices @parent can be NULL.
567 * Drivers that wish to subclass or embed struct &drm_device into their
568 * own struct should look at using drm_dev_init() instead.
571 * Pointer to new DRM device, or NULL if out of memory.
573 struct drm_device
*drm_dev_alloc(struct drm_driver
*driver
,
574 struct device
*parent
)
576 struct drm_device
*dev
;
579 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
583 ret
= drm_dev_init(dev
, driver
, parent
);
591 EXPORT_SYMBOL(drm_dev_alloc
);
593 static void drm_dev_release(struct kref
*ref
)
595 struct drm_device
*dev
= container_of(ref
, struct drm_device
, ref
);
597 if (drm_core_check_feature(dev
, DRIVER_GEM
))
598 drm_gem_destroy(dev
);
600 drm_legacy_ctxbitmap_cleanup(dev
);
601 drm_ht_remove(&dev
->map_hash
);
602 drm_fs_inode_free(dev
->anon_inode
);
604 drm_minor_free(dev
, DRM_MINOR_LEGACY
);
605 drm_minor_free(dev
, DRM_MINOR_RENDER
);
606 drm_minor_free(dev
, DRM_MINOR_CONTROL
);
608 mutex_destroy(&dev
->master_mutex
);
614 * drm_dev_ref - Take reference of a DRM device
615 * @dev: device to take reference of or NULL
617 * This increases the ref-count of @dev by one. You *must* already own a
618 * reference when calling this. Use drm_dev_unref() to drop this reference
621 * This function never fails. However, this function does not provide *any*
622 * guarantee whether the device is alive or running. It only provides a
623 * reference to the object and the memory associated with it.
625 void drm_dev_ref(struct drm_device
*dev
)
630 EXPORT_SYMBOL(drm_dev_ref
);
633 * drm_dev_unref - Drop reference of a DRM device
634 * @dev: device to drop reference of or NULL
636 * This decreases the ref-count of @dev by one. The device is destroyed if the
637 * ref-count drops to zero.
639 void drm_dev_unref(struct drm_device
*dev
)
642 kref_put(&dev
->ref
, drm_dev_release
);
644 EXPORT_SYMBOL(drm_dev_unref
);
647 * drm_dev_register - Register DRM device
648 * @dev: Device to register
649 * @flags: Flags passed to the driver's .load() function
651 * Register the DRM device @dev with the system, advertise device to user-space
652 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
655 * Never call this twice on any device!
657 * NOTE: To ensure backward compatibility with existing drivers method this
658 * function calls the ->load() method after registering the device nodes,
659 * creating race conditions. Usage of the ->load() methods is therefore
660 * deprecated, drivers must perform all initialization before calling
661 * drm_dev_register().
664 * 0 on success, negative error code on failure.
666 int drm_dev_register(struct drm_device
*dev
, unsigned long flags
)
670 mutex_lock(&drm_global_mutex
);
672 ret
= drm_minor_register(dev
, DRM_MINOR_CONTROL
);
676 ret
= drm_minor_register(dev
, DRM_MINOR_RENDER
);
680 ret
= drm_minor_register(dev
, DRM_MINOR_LEGACY
);
684 if (dev
->driver
->load
) {
685 ret
= dev
->driver
->load(dev
, flags
);
690 drm_connector_register_all(dev
);
696 drm_minor_unregister(dev
, DRM_MINOR_LEGACY
);
697 drm_minor_unregister(dev
, DRM_MINOR_RENDER
);
698 drm_minor_unregister(dev
, DRM_MINOR_CONTROL
);
700 mutex_unlock(&drm_global_mutex
);
703 EXPORT_SYMBOL(drm_dev_register
);
706 * drm_dev_unregister - Unregister DRM device
707 * @dev: Device to unregister
709 * Unregister the DRM device from the system. This does the reverse of
710 * drm_dev_register() but does not deallocate the device. The caller must call
711 * drm_dev_unref() to drop their final reference.
713 * This should be called first in the device teardown code to make sure
714 * userspace can't access the device instance any more.
716 void drm_dev_unregister(struct drm_device
*dev
)
718 struct drm_map_list
*r_list
, *list_temp
;
722 drm_connector_unregister_all(dev
);
724 if (dev
->driver
->unload
)
725 dev
->driver
->unload(dev
);
728 drm_pci_agp_destroy(dev
);
730 drm_vblank_cleanup(dev
);
732 list_for_each_entry_safe(r_list
, list_temp
, &dev
->maplist
, head
)
733 drm_legacy_rmmap(dev
, r_list
->map
);
735 drm_minor_unregister(dev
, DRM_MINOR_LEGACY
);
736 drm_minor_unregister(dev
, DRM_MINOR_RENDER
);
737 drm_minor_unregister(dev
, DRM_MINOR_CONTROL
);
739 EXPORT_SYMBOL(drm_dev_unregister
);
742 * drm_dev_set_unique - Set the unique name of a DRM device
743 * @dev: device of which to set the unique name
746 * Sets the unique name of a DRM device using the specified string. Drivers
747 * can use this at driver probe time if the unique name of the devices they
750 * Return: 0 on success or a negative error code on failure.
752 int drm_dev_set_unique(struct drm_device
*dev
, const char *name
)
755 dev
->unique
= kstrdup(name
, GFP_KERNEL
);
757 return dev
->unique
? 0 : -ENOMEM
;
759 EXPORT_SYMBOL(drm_dev_set_unique
);
763 * The DRM core module initializes all global DRM objects and makes them
764 * available to drivers. Once setup, drivers can probe their respective
766 * Currently, core management includes:
767 * - The "DRM-Global" key/value database
768 * - Global ID management for connectors
769 * - DRM major number allocation
770 * - DRM minor management
774 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
775 * interface registered on a DRM device, you can request minor numbers from DRM
776 * core. DRM core takes care of major-number management and char-dev
777 * registration. A stub ->open() callback forwards any open() requests to the
781 static int drm_stub_open(struct inode
*inode
, struct file
*filp
)
783 const struct file_operations
*new_fops
;
784 struct drm_minor
*minor
;
789 mutex_lock(&drm_global_mutex
);
790 minor
= drm_minor_acquire(iminor(inode
));
792 err
= PTR_ERR(minor
);
796 new_fops
= fops_get(minor
->dev
->driver
->fops
);
802 replace_fops(filp
, new_fops
);
803 if (filp
->f_op
->open
)
804 err
= filp
->f_op
->open(inode
, filp
);
809 drm_minor_release(minor
);
811 mutex_unlock(&drm_global_mutex
);
815 static const struct file_operations drm_stub_fops
= {
816 .owner
= THIS_MODULE
,
817 .open
= drm_stub_open
,
818 .llseek
= noop_llseek
,
821 static int __init
drm_core_init(void)
826 drm_connector_ida_init();
827 idr_init(&drm_minors_idr
);
829 if (register_chrdev(DRM_MAJOR
, "drm", &drm_stub_fops
))
832 ret
= drm_sysfs_init();
834 printk(KERN_ERR
"DRM: Error creating drm class.\n");
838 drm_debugfs_root
= debugfs_create_dir("dri", NULL
);
839 if (!drm_debugfs_root
) {
840 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
845 DRM_INFO("Initialized %s %d.%d.%d %s\n",
846 CORE_NAME
, CORE_MAJOR
, CORE_MINOR
, CORE_PATCHLEVEL
, CORE_DATE
);
851 unregister_chrdev(DRM_MAJOR
, "drm");
853 idr_destroy(&drm_minors_idr
);
858 static void __exit
drm_core_exit(void)
860 debugfs_remove(drm_debugfs_root
);
863 unregister_chrdev(DRM_MAJOR
, "drm");
865 drm_connector_ida_destroy();
866 idr_destroy(&drm_minors_idr
);
869 module_init(drm_core_init
);
870 module_exit(drm_core_exit
);