1/**
  2 * \file drm_stub.h
  3 * Stub support
  4 *
  5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
  6 */
  7
  8/*
  9 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
 10 *
 11 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
 12 * All Rights Reserved.
 13 *
 14 * Permission is hereby granted, free of charge, to any person obtaining a
 15 * copy of this software and associated documentation files (the "Software"),
 16 * to deal in the Software without restriction, including without limitation
 17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 18 * and/or sell copies of the Software, and to permit persons to whom the
 19 * Software is furnished to do so, subject to the following conditions:
 20 *
 21 * The above copyright notice and this permission notice (including the next
 22 * paragraph) shall be included in all copies or substantial portions of the
 23 * Software.
 24 *
 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 31 * DEALINGS IN THE SOFTWARE.
 32 */
 33
 34#include <linux/fs.h>
 35#include <linux/module.h>
 36#include <linux/moduleparam.h>
 37#include <linux/mount.h>
 38#include <linux/slab.h>
 39#include <drm/drmP.h>
 40#include <drm/drm_core.h>
 41
 42unsigned int drm_debug = 0;	/* 1 to enable debug output */
 43EXPORT_SYMBOL(drm_debug);
 44
 45unsigned int drm_rnodes = 0;	/* 1 to enable experimental render nodes API */
 46EXPORT_SYMBOL(drm_rnodes);
 47
 48/* 1 to allow user space to request universal planes (experimental) */
 49unsigned int drm_universal_planes = 0;
 50EXPORT_SYMBOL(drm_universal_planes);
 51
 52unsigned int drm_vblank_offdelay = 5000;    /* Default to 5000 msecs. */
 53EXPORT_SYMBOL(drm_vblank_offdelay);
 54
 55unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
 56EXPORT_SYMBOL(drm_timestamp_precision);
 57
 58/*
 59 * Default to use monotonic timestamps for wait-for-vblank and page-flip
 60 * complete events.
 61 */
 62unsigned int drm_timestamp_monotonic = 1;
 63
 64MODULE_AUTHOR(CORE_AUTHOR);
 65MODULE_DESCRIPTION(CORE_DESC);
 66MODULE_LICENSE("GPL and additional rights");
 67MODULE_PARM_DESC(debug, "Enable debug output");
 68MODULE_PARM_DESC(rnodes, "Enable experimental render nodes API");
 69MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
 70MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
 71MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
 72
 73module_param_named(debug, drm_debug, int, 0600);
 74module_param_named(rnodes, drm_rnodes, int, 0600);
 75module_param_named(universal_planes, drm_universal_planes, int, 0600);
 76module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
 77module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
 78module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
 79
 80static DEFINE_SPINLOCK(drm_minor_lock);
 81struct idr drm_minors_idr;
 82
 83struct class *drm_class;
 84struct dentry *drm_debugfs_root;
 85
 86int drm_err(const char *func, const char *format, ...)
 87{
 88	struct va_format vaf;
 89	va_list args;
 90	int r;
 91
 92	va_start(args, format);
 93
 94	vaf.fmt = format;
 95	vaf.va = &args;
 96
 97	r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf);
 98
 99	va_end(args);
100
101	return r;
102}
103EXPORT_SYMBOL(drm_err);
104
105void drm_ut_debug_printk(const char *function_name, const char *format, ...)
106{
107	struct va_format vaf;
108	va_list args;
109
110	va_start(args, format);
111	vaf.fmt = format;
112	vaf.va = &args;
113
114	printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf);
115
116	va_end(args);
117}
118EXPORT_SYMBOL(drm_ut_debug_printk);
119
120struct drm_master *drm_master_create(struct drm_minor *minor)
121{
122	struct drm_master *master;
123
124	master = kzalloc(sizeof(*master), GFP_KERNEL);
125	if (!master)
126		return NULL;
127
128	kref_init(&master->refcount);
129	spin_lock_init(&master->lock.spinlock);
130	init_waitqueue_head(&master->lock.lock_queue);
131	drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
132	INIT_LIST_HEAD(&master->magicfree);
133	master->minor = minor;
134
135	return master;
136}
137
138struct drm_master *drm_master_get(struct drm_master *master)
139{
140	kref_get(&master->refcount);
141	return master;
142}
143EXPORT_SYMBOL(drm_master_get);
144
145static void drm_master_destroy(struct kref *kref)
146{
147	struct drm_master *master = container_of(kref, struct drm_master, refcount);
148	struct drm_magic_entry *pt, *next;
149	struct drm_device *dev = master->minor->dev;
150	struct drm_map_list *r_list, *list_temp;
151
152	mutex_lock(&dev->struct_mutex);
153	if (dev->driver->master_destroy)
154		dev->driver->master_destroy(dev, master);
155
156	list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
157		if (r_list->master == master) {
158			drm_rmmap_locked(dev, r_list->map);
159			r_list = NULL;
160		}
161	}
162
163	if (master->unique) {
164		kfree(master->unique);
165		master->unique = NULL;
166		master->unique_len = 0;
167	}
168
169	kfree(dev->devname);
170	dev->devname = NULL;
171
172	list_for_each_entry_safe(pt, next, &master->magicfree, head) {
173		list_del(&pt->head);
174		drm_ht_remove_item(&master->magiclist, &pt->hash_item);
175		kfree(pt);
176	}
177
178	drm_ht_remove(&master->magiclist);
179
180	mutex_unlock(&dev->struct_mutex);
181	kfree(master);
182}
183
184void drm_master_put(struct drm_master **master)
185{
186	kref_put(&(*master)->refcount, drm_master_destroy);
187	*master = NULL;
188}
189EXPORT_SYMBOL(drm_master_put);
190
191int drm_setmaster_ioctl(struct drm_device *dev, void *data,
192			struct drm_file *file_priv)
193{
194	int ret = 0;
195
196	mutex_lock(&dev->master_mutex);
197	if (file_priv->is_master)
198		goto out_unlock;
199
200	if (file_priv->minor->master) {
201		ret = -EINVAL;
202		goto out_unlock;
203	}
204
205	if (!file_priv->master) {
206		ret = -EINVAL;
207		goto out_unlock;
208	}
209
210	file_priv->minor->master = drm_master_get(file_priv->master);
211	file_priv->is_master = 1;
212	if (dev->driver->master_set) {
213		ret = dev->driver->master_set(dev, file_priv, false);
214		if (unlikely(ret != 0)) {
215			file_priv->is_master = 0;
216			drm_master_put(&file_priv->minor->master);
217		}
218	}
219
220out_unlock:
221	mutex_unlock(&dev->master_mutex);
222	return ret;
223}
224
225int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
226			 struct drm_file *file_priv)
227{
228	int ret = -EINVAL;
229
230	mutex_lock(&dev->master_mutex);
231	if (!file_priv->is_master)
232		goto out_unlock;
233
234	if (!file_priv->minor->master)
235		goto out_unlock;
236
237	ret = 0;
238	if (dev->driver->master_drop)
239		dev->driver->master_drop(dev, file_priv, false);
240	drm_master_put(&file_priv->minor->master);
241	file_priv->is_master = 0;
242
243out_unlock:
244	mutex_unlock(&dev->master_mutex);
245	return ret;
246}
247
248/*
249 * DRM Minors
250 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
251 * of them is represented by a drm_minor object. Depending on the capabilities
252 * of the device-driver, different interfaces are registered.
253 *
254 * Minors can be accessed via dev->$minor_name. This pointer is either
255 * NULL or a valid drm_minor pointer and stays valid as long as the device is
256 * valid. This means, DRM minors have the same life-time as the underlying
257 * device. However, this doesn't mean that the minor is active. Minors are
258 * registered and unregistered dynamically according to device-state.
259 */
260
261static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
262					     unsigned int type)
263{
264	switch (type) {
265	case DRM_MINOR_LEGACY:
266		return &dev->primary;
267	case DRM_MINOR_RENDER:
268		return &dev->render;
269	case DRM_MINOR_CONTROL:
270		return &dev->control;
271	default:
272		return NULL;
273	}
274}
275
276static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
277{
278	struct drm_minor *minor;
279
280	minor = kzalloc(sizeof(*minor), GFP_KERNEL);
281	if (!minor)
282		return -ENOMEM;
283
284	minor->type = type;
285	minor->dev = dev;
286
287	*drm_minor_get_slot(dev, type) = minor;
288	return 0;
289}
290
291static void drm_minor_free(struct drm_device *dev, unsigned int type)
292{
293	struct drm_minor **slot;
294
295	slot = drm_minor_get_slot(dev, type);
296	if (*slot) {
297		kfree(*slot);
298		*slot = NULL;
299	}
300}
301
302static int drm_minor_register(struct drm_device *dev, unsigned int type)
303{
304	struct drm_minor *new_minor;
305	unsigned long flags;
306	int ret;
307	int minor_id;
308
309	DRM_DEBUG("\n");
310
311	new_minor = *drm_minor_get_slot(dev, type);
312	if (!new_minor)
313		return 0;
314
315	idr_preload(GFP_KERNEL);
316	spin_lock_irqsave(&drm_minor_lock, flags);
317	minor_id = idr_alloc(&drm_minors_idr,
318			     NULL,
319			     64 * type,
320			     64 * (type + 1),
321			     GFP_NOWAIT);
322	spin_unlock_irqrestore(&drm_minor_lock, flags);
323	idr_preload_end();
324
325	if (minor_id < 0)
326		return minor_id;
327
328	new_minor->index = minor_id;
329
330	ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
331	if (ret) {
332		DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
333		goto err_id;
334	}
335
336	ret = drm_sysfs_device_add(new_minor);
337	if (ret) {
338		DRM_ERROR("DRM: Error sysfs_device_add.\n");
339		goto err_debugfs;
340	}
341
342	/* replace NULL with @minor so lookups will succeed from now on */
343	spin_lock_irqsave(&drm_minor_lock, flags);
344	idr_replace(&drm_minors_idr, new_minor, new_minor->index);
345	spin_unlock_irqrestore(&drm_minor_lock, flags);
346
347	DRM_DEBUG("new minor assigned %d\n", minor_id);
348	return 0;
349
350err_debugfs:
351	drm_debugfs_cleanup(new_minor);
352err_id:
353	spin_lock_irqsave(&drm_minor_lock, flags);
354	idr_remove(&drm_minors_idr, minor_id);
355	spin_unlock_irqrestore(&drm_minor_lock, flags);
356	new_minor->index = 0;
357	return ret;
358}
359
360static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
361{
362	struct drm_minor *minor;
363	unsigned long flags;
364
365	minor = *drm_minor_get_slot(dev, type);
366	if (!minor || !minor->kdev)
367		return;
368
369	spin_lock_irqsave(&drm_minor_lock, flags);
370	idr_remove(&drm_minors_idr, minor->index);
371	spin_unlock_irqrestore(&drm_minor_lock, flags);
372	minor->index = 0;
373
374	drm_debugfs_cleanup(minor);
375	drm_sysfs_device_remove(minor);
376}
377
378/**
379 * drm_minor_acquire - Acquire a DRM minor
380 * @minor_id: Minor ID of the DRM-minor
381 *
382 * Looks up the given minor-ID and returns the respective DRM-minor object. The
383 * refence-count of the underlying device is increased so you must release this
384 * object with drm_minor_release().
385 *
386 * As long as you hold this minor, it is guaranteed that the object and the
387 * minor->dev pointer will stay valid! However, the device may get unplugged and
388 * unregistered while you hold the minor.
389 *
390 * Returns:
391 * Pointer to minor-object with increased device-refcount, or PTR_ERR on
392 * failure.
393 */
394struct drm_minor *drm_minor_acquire(unsigned int minor_id)
395{
396	struct drm_minor *minor;
397	unsigned long flags;
398
399	spin_lock_irqsave(&drm_minor_lock, flags);
400	minor = idr_find(&drm_minors_idr, minor_id);
401	if (minor)
402		drm_dev_ref(minor->dev);
403	spin_unlock_irqrestore(&drm_minor_lock, flags);
404
405	if (!minor) {
406		return ERR_PTR(-ENODEV);
407	} else if (drm_device_is_unplugged(minor->dev)) {
408		drm_dev_unref(minor->dev);
409		return ERR_PTR(-ENODEV);
410	}
411
412	return minor;
413}
414
415/**
416 * drm_minor_release - Release DRM minor
417 * @minor: Pointer to DRM minor object
418 *
419 * Release a minor that was previously acquired via drm_minor_acquire().
420 */
421void drm_minor_release(struct drm_minor *minor)
422{
423	drm_dev_unref(minor->dev);
424}
425
426/**
427 * Called via drm_exit() at module unload time or when pci device is
428 * unplugged.
429 *
430 * Cleans up all DRM device, calling drm_lastclose().
431 *
432 */
433void drm_put_dev(struct drm_device *dev)
434{
435	DRM_DEBUG("\n");
436
437	if (!dev) {
438		DRM_ERROR("cleanup called no dev\n");
439		return;
440	}
441
442	drm_dev_unregister(dev);
443	drm_dev_unref(dev);
444}
445EXPORT_SYMBOL(drm_put_dev);
446
447void drm_unplug_dev(struct drm_device *dev)
448{
449	/* for a USB device */
450	drm_minor_unregister(dev, DRM_MINOR_LEGACY);
451	drm_minor_unregister(dev, DRM_MINOR_RENDER);
452	drm_minor_unregister(dev, DRM_MINOR_CONTROL);
453
454	mutex_lock(&drm_global_mutex);
455
456	drm_device_set_unplugged(dev);
457
458	if (dev->open_count == 0) {
459		drm_put_dev(dev);
460	}
461	mutex_unlock(&drm_global_mutex);
462}
463EXPORT_SYMBOL(drm_unplug_dev);
464
465/*
466 * DRM internal mount
467 * We want to be able to allocate our own "struct address_space" to control
468 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
469 * stand-alone address_space objects, so we need an underlying inode. As there
470 * is no way to allocate an independent inode easily, we need a fake internal
471 * VFS mount-point.
472 *
473 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
474 * frees it again. You are allowed to use iget() and iput() to get references to
475 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
476 * drm_fs_inode_free() call (which does not have to be the last iput()).
477 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
478 * between multiple inode-users. You could, technically, call
479 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
480 * iput(), but this way you'd end up with a new vfsmount for each inode.
481 */
482
483static int drm_fs_cnt;
484static struct vfsmount *drm_fs_mnt;
485
486static const struct dentry_operations drm_fs_dops = {
487	.d_dname	= simple_dname,
488};
489
490static const struct super_operations drm_fs_sops = {
491	.statfs		= simple_statfs,
492};
493
494static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
495				   const char *dev_name, void *data)
496{
497	return mount_pseudo(fs_type,
498			    "drm:",
499			    &drm_fs_sops,
500			    &drm_fs_dops,
501			    0x010203ff);
502}
503
504static struct file_system_type drm_fs_type = {
505	.name		= "drm",
506	.owner		= THIS_MODULE,
507	.mount		= drm_fs_mount,
508	.kill_sb	= kill_anon_super,
509};
510
511static struct inode *drm_fs_inode_new(void)
512{
513	struct inode *inode;
514	int r;
515
516	r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
517	if (r < 0) {
518		DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
519		return ERR_PTR(r);
520	}
521
522	inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
523	if (IS_ERR(inode))
524		simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
525
526	return inode;
527}
528
529static void drm_fs_inode_free(struct inode *inode)
530{
531	if (inode) {
532		iput(inode);
533		simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
534	}
535}
536
537/**
538 * drm_dev_alloc - Allocate new drm device
539 * @driver: DRM driver to allocate device for
540 * @parent: Parent device object
541 *
542 * Allocate and initialize a new DRM device. No device registration is done.
543 * Call drm_dev_register() to advertice the device to user space and register it
544 * with other core subsystems.
545 *
546 * The initial ref-count of the object is 1. Use drm_dev_ref() and
547 * drm_dev_unref() to take and drop further ref-counts.
548 *
549 * RETURNS:
550 * Pointer to new DRM device, or NULL if out of memory.
551 */
552struct drm_device *drm_dev_alloc(struct drm_driver *driver,
553				 struct device *parent)
554{
555	struct drm_device *dev;
556	int ret;
557
558	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
559	if (!dev)
560		return NULL;
561
562	kref_init(&dev->ref);
563	dev->dev = parent;
564	dev->driver = driver;
565
566	INIT_LIST_HEAD(&dev->filelist);
567	INIT_LIST_HEAD(&dev->ctxlist);
568	INIT_LIST_HEAD(&dev->vmalist);
569	INIT_LIST_HEAD(&dev->maplist);
570	INIT_LIST_HEAD(&dev->vblank_event_list);
571
572	spin_lock_init(&dev->count_lock);
573	spin_lock_init(&dev->event_lock);
574	mutex_init(&dev->struct_mutex);
575	mutex_init(&dev->ctxlist_mutex);
576	mutex_init(&dev->master_mutex);
577
578	dev->anon_inode = drm_fs_inode_new();
579	if (IS_ERR(dev->anon_inode)) {
580		ret = PTR_ERR(dev->anon_inode);
581		DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
582		goto err_free;
583	}
584
585	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
586		ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL);
587		if (ret)
588			goto err_minors;
589	}
590
591	if (drm_core_check_feature(dev, DRIVER_RENDER) && drm_rnodes) {
592		ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
593		if (ret)
594			goto err_minors;
595	}
596
597	ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY);
598	if (ret)
599		goto err_minors;
600
601	if (drm_ht_create(&dev->map_hash, 12))
602		goto err_minors;
603
604	ret = drm_ctxbitmap_init(dev);
605	if (ret) {
606		DRM_ERROR("Cannot allocate memory for context bitmap.\n");
607		goto err_ht;
608	}
609
610	if (driver->driver_features & DRIVER_GEM) {
611		ret = drm_gem_init(dev);
612		if (ret) {
613			DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
614			goto err_ctxbitmap;
615		}
616	}
617
618	return dev;
619
620err_ctxbitmap:
621	drm_ctxbitmap_cleanup(dev);
622err_ht:
623	drm_ht_remove(&dev->map_hash);
624err_minors:
625	drm_minor_free(dev, DRM_MINOR_LEGACY);
626	drm_minor_free(dev, DRM_MINOR_RENDER);
627	drm_minor_free(dev, DRM_MINOR_CONTROL);
628	drm_fs_inode_free(dev->anon_inode);
629err_free:
630	mutex_destroy(&dev->master_mutex);
631	kfree(dev);
632	return NULL;
633}
634EXPORT_SYMBOL(drm_dev_alloc);
635
636static void drm_dev_release(struct kref *ref)
637{
638	struct drm_device *dev = container_of(ref, struct drm_device, ref);
639
640	if (dev->driver->driver_features & DRIVER_GEM)
641		drm_gem_destroy(dev);
642
643	drm_ctxbitmap_cleanup(dev);
644	drm_ht_remove(&dev->map_hash);
645	drm_fs_inode_free(dev->anon_inode);
646
647	drm_minor_free(dev, DRM_MINOR_LEGACY);
648	drm_minor_free(dev, DRM_MINOR_RENDER);
649	drm_minor_free(dev, DRM_MINOR_CONTROL);
650
651	kfree(dev->devname);
652
653	mutex_destroy(&dev->master_mutex);
654	kfree(dev);
655}
656
657/**
658 * drm_dev_ref - Take reference of a DRM device
659 * @dev: device to take reference of or NULL
660 *
661 * This increases the ref-count of @dev by one. You *must* already own a
662 * reference when calling this. Use drm_dev_unref() to drop this reference
663 * again.
664 *
665 * This function never fails. However, this function does not provide *any*
666 * guarantee whether the device is alive or running. It only provides a
667 * reference to the object and the memory associated with it.
668 */
669void drm_dev_ref(struct drm_device *dev)
670{
671	if (dev)
672		kref_get(&dev->ref);
673}
674EXPORT_SYMBOL(drm_dev_ref);
675
676/**
677 * drm_dev_unref - Drop reference of a DRM device
678 * @dev: device to drop reference of or NULL
679 *
680 * This decreases the ref-count of @dev by one. The device is destroyed if the
681 * ref-count drops to zero.
682 */
683void drm_dev_unref(struct drm_device *dev)
684{
685	if (dev)
686		kref_put(&dev->ref, drm_dev_release);
687}
688EXPORT_SYMBOL(drm_dev_unref);
689
690/**
691 * drm_dev_register - Register DRM device
692 * @dev: Device to register
693 *
694 * Register the DRM device @dev with the system, advertise device to user-space
695 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
696 * previously.
697 *
698 * Never call this twice on any device!
699 *
700 * RETURNS:
701 * 0 on success, negative error code on failure.
702 */
703int drm_dev_register(struct drm_device *dev, unsigned long flags)
704{
705	int ret;
706
707	mutex_lock(&drm_global_mutex);
708
709	ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
710	if (ret)
711		goto err_minors;
712
713	ret = drm_minor_register(dev, DRM_MINOR_RENDER);
714	if (ret)
715		goto err_minors;
716
717	ret = drm_minor_register(dev, DRM_MINOR_LEGACY);
718	if (ret)
719		goto err_minors;
720
721	if (dev->driver->load) {
722		ret = dev->driver->load(dev, flags);
723		if (ret)
724			goto err_minors;
725	}
726
727	/* setup grouping for legacy outputs */
728	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
729		ret = drm_mode_group_init_legacy_group(dev,
730				&dev->primary->mode_group);
731		if (ret)
732			goto err_unload;
733	}
734
735	ret = 0;
736	goto out_unlock;
737
738err_unload:
739	if (dev->driver->unload)
740		dev->driver->unload(dev);
741err_minors:
742	drm_minor_unregister(dev, DRM_MINOR_LEGACY);
743	drm_minor_unregister(dev, DRM_MINOR_RENDER);
744	drm_minor_unregister(dev, DRM_MINOR_CONTROL);
745out_unlock:
746	mutex_unlock(&drm_global_mutex);
747	return ret;
748}
749EXPORT_SYMBOL(drm_dev_register);
750
751/**
752 * drm_dev_unregister - Unregister DRM device
753 * @dev: Device to unregister
754 *
755 * Unregister the DRM device from the system. This does the reverse of
756 * drm_dev_register() but does not deallocate the device. The caller must call
757 * drm_dev_unref() to drop their final reference.
758 */
759void drm_dev_unregister(struct drm_device *dev)
760{
761	struct drm_map_list *r_list, *list_temp;
762
763	drm_lastclose(dev);
764
765	if (dev->driver->unload)
766		dev->driver->unload(dev);
767
768	if (dev->agp)
769		drm_pci_agp_destroy(dev);
770
771	drm_vblank_cleanup(dev);
772
773	list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
774		drm_rmmap(dev, r_list->map);
775
776	drm_minor_unregister(dev, DRM_MINOR_LEGACY);
777	drm_minor_unregister(dev, DRM_MINOR_RENDER);
778	drm_minor_unregister(dev, DRM_MINOR_CONTROL);
779}
780EXPORT_SYMBOL(drm_dev_unregister);