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/err.h>
35 #include <linux/export.h>
36 #include <linux/fs.h>
37 #include <linux/module.h>
38 #include <linux/moduleparam.h>
39 #include <linux/mount.h>
40 #include <linux/printk.h>
41 #include <linux/slab.h>
42 #include <drm/drmP.h>
43 #include <drm/drm_core.h>
44
45 unsigned int drm_debug = 0; /* 1 to enable debug output */
46 EXPORT_SYMBOL(drm_debug);
47
48 unsigned int drm_rnodes = 0; /* 1 to enable experimental render nodes API */
49 EXPORT_SYMBOL(drm_rnodes);
50
51 /* 1 to allow user space to request universal planes (experimental) */
52 unsigned int drm_universal_planes = 0;
53 EXPORT_SYMBOL(drm_universal_planes);
54
55 unsigned int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
56 EXPORT_SYMBOL(drm_vblank_offdelay);
57
58 unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
59 EXPORT_SYMBOL(drm_timestamp_precision);
60
61 /*
62 * Default to use monotonic timestamps for wait-for-vblank and page-flip
63 * complete events.
64 */
65 unsigned int drm_timestamp_monotonic = 1;
66
67 MODULE_AUTHOR(CORE_AUTHOR);
68 MODULE_DESCRIPTION(CORE_DESC);
69 MODULE_LICENSE("GPL and additional rights");
70 MODULE_PARM_DESC(debug, "Enable debug output");
71 MODULE_PARM_DESC(rnodes, "Enable experimental render nodes API");
72 MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
73 MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
74 MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
75
76 module_param_named(debug, drm_debug, int, 0600);
77 module_param_named(rnodes, drm_rnodes, int, 0600);
78 module_param_named(universal_planes, drm_universal_planes, int, 0600);
79 module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
80 module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
81 module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
82
83 #ifdef __NetBSD__
84 spinlock_t drm_minor_lock;
85 #else
86 static DEFINE_SPINLOCK(drm_minor_lock);
87 #endif
88 struct idr drm_minors_idr;
89
90 #ifndef __NetBSD__
91 struct class *drm_class;
92 struct dentry *drm_debugfs_root;
93 #endif
94
drm_err(const char * func,const char * format,...)95 int drm_err(const char *func, const char *format, ...)
96 {
97 #ifdef __NetBSD__
98 va_list args;
99
100 va_start(args, format);
101 printf("DRM error in %s: ", func);
102 vprintf(format, args);
103 va_end(args);
104
105 return 0;
106 #else
107 struct va_format vaf;
108 va_list args;
109 int r;
110
111 va_start(args, format);
112
113 vaf.fmt = format;
114 vaf.va = &args;
115
116 r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf);
117
118 va_end(args);
119
120 return r;
121 #endif
122 }
123 EXPORT_SYMBOL(drm_err);
124
drm_ut_debug_printk(const char * function_name,const char * format,...)125 void drm_ut_debug_printk(const char *function_name, const char *format, ...)
126 {
127 #ifdef __NetBSD__
128 va_list args;
129
130 va_start(args, format);
131 printf("DRM debug in %s: ", function_name);
132 vprintf(format, args);
133 va_end(args);
134 #else
135 struct va_format vaf;
136 va_list args;
137
138 va_start(args, format);
139 vaf.fmt = format;
140 vaf.va = &args;
141
142 printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf);
143
144 va_end(args);
145 #endif
146 }
147 EXPORT_SYMBOL(drm_ut_debug_printk);
148
drm_master_create(struct drm_minor * minor)149 struct drm_master *drm_master_create(struct drm_minor *minor)
150 {
151 struct drm_master *master;
152
153 master = kzalloc(sizeof(*master), GFP_KERNEL);
154 if (!master)
155 return NULL;
156
157 kref_init(&master->refcount);
158 spin_lock_init(&master->lock.spinlock);
159 #ifdef __NetBSD__
160 DRM_INIT_WAITQUEUE(&master->lock.lock_queue, "drmlockq");
161 #else
162 init_waitqueue_head(&master->lock.lock_queue);
163 #endif
164 drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
165 INIT_LIST_HEAD(&master->magicfree);
166 master->minor = minor;
167
168 return master;
169 }
170
drm_master_get(struct drm_master * master)171 struct drm_master *drm_master_get(struct drm_master *master)
172 {
173 kref_get(&master->refcount);
174 return master;
175 }
176 EXPORT_SYMBOL(drm_master_get);
177
drm_master_destroy(struct kref * kref)178 static void drm_master_destroy(struct kref *kref)
179 {
180 struct drm_master *master = container_of(kref, struct drm_master, refcount);
181 struct drm_magic_entry *pt, *next;
182 struct drm_device *dev = master->minor->dev;
183 struct drm_map_list *r_list, *list_temp;
184
185 mutex_lock(&dev->struct_mutex);
186 if (dev->driver->master_destroy)
187 dev->driver->master_destroy(dev, master);
188
189 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
190 if (r_list->master == master) {
191 drm_rmmap_locked(dev, r_list->map);
192 r_list = NULL;
193 }
194 }
195
196 if (master->unique) {
197 kfree(master->unique);
198 master->unique = NULL;
199 master->unique_len = 0;
200 }
201
202 kfree(dev->devname);
203 dev->devname = NULL;
204
205 list_for_each_entry_safe(pt, next, &master->magicfree, head) {
206 list_del(&pt->head);
207 drm_ht_remove_item(&master->magiclist, &pt->hash_item);
208 kfree(pt);
209 }
210
211 drm_ht_remove(&master->magiclist);
212
213 #ifdef __NetBSD__
214 spin_lock_destroy(&master->lock.spinlock);
215 DRM_DESTROY_WAITQUEUE(&master->lock.lock_queue);
216 #endif
217
218 mutex_unlock(&dev->struct_mutex);
219 kfree(master);
220 }
221
drm_master_put(struct drm_master ** master)222 void drm_master_put(struct drm_master **master)
223 {
224 kref_put(&(*master)->refcount, drm_master_destroy);
225 *master = NULL;
226 }
227 EXPORT_SYMBOL(drm_master_put);
228
drm_setmaster_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)229 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
230 struct drm_file *file_priv)
231 {
232 int ret = 0;
233
234 mutex_lock(&dev->master_mutex);
235 if (file_priv->is_master)
236 goto out_unlock;
237
238 if (file_priv->minor->master) {
239 ret = -EINVAL;
240 goto out_unlock;
241 }
242
243 if (!file_priv->master) {
244 ret = -EINVAL;
245 goto out_unlock;
246 }
247
248 file_priv->minor->master = drm_master_get(file_priv->master);
249 file_priv->is_master = 1;
250 if (dev->driver->master_set) {
251 ret = dev->driver->master_set(dev, file_priv, false);
252 if (unlikely(ret != 0)) {
253 file_priv->is_master = 0;
254 drm_master_put(&file_priv->minor->master);
255 }
256 }
257
258 out_unlock:
259 mutex_unlock(&dev->master_mutex);
260 return ret;
261 }
262
drm_dropmaster_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)263 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
264 struct drm_file *file_priv)
265 {
266 int ret = -EINVAL;
267
268 mutex_lock(&dev->master_mutex);
269 if (!file_priv->is_master)
270 goto out_unlock;
271
272 if (!file_priv->minor->master)
273 goto out_unlock;
274
275 ret = 0;
276 if (dev->driver->master_drop)
277 dev->driver->master_drop(dev, file_priv, false);
278 drm_master_put(&file_priv->minor->master);
279 file_priv->is_master = 0;
280
281 out_unlock:
282 mutex_unlock(&dev->master_mutex);
283 return ret;
284 }
285
286 /*
287 * DRM Minors
288 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
289 * of them is represented by a drm_minor object. Depending on the capabilities
290 * of the device-driver, different interfaces are registered.
291 *
292 * Minors can be accessed via dev->$minor_name. This pointer is either
293 * NULL or a valid drm_minor pointer and stays valid as long as the device is
294 * valid. This means, DRM minors have the same life-time as the underlying
295 * device. However, this doesn't mean that the minor is active. Minors are
296 * registered and unregistered dynamically according to device-state.
297 */
298
drm_minor_get_slot(struct drm_device * dev,unsigned int type)299 static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
300 unsigned int type)
301 {
302 switch (type) {
303 case DRM_MINOR_LEGACY:
304 return &dev->primary;
305 case DRM_MINOR_RENDER:
306 return &dev->render;
307 case DRM_MINOR_CONTROL:
308 return &dev->control;
309 default:
310 return NULL;
311 }
312 }
313
drm_minor_alloc(struct drm_device * dev,unsigned int type)314 static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
315 {
316 struct drm_minor *minor;
317
318 minor = kzalloc(sizeof(*minor), GFP_KERNEL);
319 if (!minor)
320 return -ENOMEM;
321
322 minor->type = type;
323 minor->dev = dev;
324
325 *drm_minor_get_slot(dev, type) = minor;
326 return 0;
327 }
328
drm_minor_free(struct drm_device * dev,unsigned int type)329 static void drm_minor_free(struct drm_device *dev, unsigned int type)
330 {
331 struct drm_minor **slot;
332
333 slot = drm_minor_get_slot(dev, type);
334 if (*slot) {
335 kfree(*slot);
336 *slot = NULL;
337 }
338 }
339
drm_minor_register(struct drm_device * dev,unsigned int type)340 static int drm_minor_register(struct drm_device *dev, unsigned int type)
341 {
342 struct drm_minor *new_minor;
343 unsigned long flags;
344 #ifndef __NetBSD__
345 int ret;
346 #endif
347 int minor_id;
348
349 DRM_DEBUG("\n");
350
351 new_minor = *drm_minor_get_slot(dev, type);
352 if (!new_minor)
353 return 0;
354
355 idr_preload(GFP_KERNEL);
356 spin_lock_irqsave(&drm_minor_lock, flags);
357 minor_id = idr_alloc(&drm_minors_idr,
358 NULL,
359 64 * type,
360 64 * (type + 1),
361 GFP_NOWAIT);
362 spin_unlock_irqrestore(&drm_minor_lock, flags);
363 idr_preload_end();
364
365 if (minor_id < 0)
366 return minor_id;
367
368 new_minor->index = minor_id;
369
370 #ifndef __NetBSD__
371 ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
372 if (ret) {
373 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
374 goto err_id;
375 }
376
377 ret = drm_sysfs_device_add(new_minor);
378 if (ret) {
379 DRM_ERROR("DRM: Error sysfs_device_add.\n");
380 goto err_debugfs;
381 }
382 #endif
383 /* replace NULL with @minor so lookups will succeed from now on */
384 spin_lock_irqsave(&drm_minor_lock, flags);
385 idr_replace(&drm_minors_idr, new_minor, new_minor->index);
386 spin_unlock_irqrestore(&drm_minor_lock, flags);
387
388 DRM_DEBUG("new minor assigned %d\n", minor_id);
389 return 0;
390
391 #ifndef __NetBSD__
392 err_debugfs:
393 drm_debugfs_cleanup(new_minor);
394 err_id:
395 spin_lock_irqsave(&drm_minor_lock, flags);
396 idr_remove(&drm_minors_idr, minor_id);
397 spin_unlock_irqrestore(&drm_minor_lock, flags);
398 new_minor->index = 0;
399 return ret;
400 #endif
401 }
402
drm_minor_unregister(struct drm_device * dev,unsigned int type)403 static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
404 {
405 struct drm_minor *minor;
406 unsigned long flags;
407
408 minor = *drm_minor_get_slot(dev, type);
409 if (!minor || !minor->kdev)
410 return;
411
412 spin_lock_irqsave(&drm_minor_lock, flags);
413 idr_remove(&drm_minors_idr, minor->index);
414 spin_unlock_irqrestore(&drm_minor_lock, flags);
415 minor->index = 0;
416
417 drm_debugfs_cleanup(minor);
418 drm_sysfs_device_remove(minor);
419 }
420
421 /**
422 * drm_minor_acquire - Acquire a DRM minor
423 * @minor_id: Minor ID of the DRM-minor
424 *
425 * Looks up the given minor-ID and returns the respective DRM-minor object. The
426 * refence-count of the underlying device is increased so you must release this
427 * object with drm_minor_release().
428 *
429 * As long as you hold this minor, it is guaranteed that the object and the
430 * minor->dev pointer will stay valid! However, the device may get unplugged and
431 * unregistered while you hold the minor.
432 *
433 * Returns:
434 * Pointer to minor-object with increased device-refcount, or PTR_ERR on
435 * failure.
436 */
drm_minor_acquire(unsigned int minor_id)437 struct drm_minor *drm_minor_acquire(unsigned int minor_id)
438 {
439 struct drm_minor *minor;
440 unsigned long flags;
441
442 spin_lock_irqsave(&drm_minor_lock, flags);
443 minor = idr_find(&drm_minors_idr, minor_id);
444 if (minor)
445 drm_dev_ref(minor->dev);
446 spin_unlock_irqrestore(&drm_minor_lock, flags);
447
448 if (!minor) {
449 return ERR_PTR(-ENODEV);
450 } else if (drm_device_is_unplugged(minor->dev)) {
451 drm_dev_unref(minor->dev);
452 return ERR_PTR(-ENODEV);
453 }
454
455 return minor;
456 }
457
458 /**
459 * drm_minor_release - Release DRM minor
460 * @minor: Pointer to DRM minor object
461 *
462 * Release a minor that was previously acquired via drm_minor_acquire().
463 */
drm_minor_release(struct drm_minor * minor)464 void drm_minor_release(struct drm_minor *minor)
465 {
466 drm_dev_unref(minor->dev);
467 }
468
469 /**
470 * Called via drm_exit() at module unload time or when pci device is
471 * unplugged.
472 *
473 * Cleans up all DRM device, calling drm_lastclose().
474 *
475 */
drm_put_dev(struct drm_device * dev)476 void drm_put_dev(struct drm_device *dev)
477 {
478 DRM_DEBUG("\n");
479
480 if (!dev) {
481 DRM_ERROR("cleanup called no dev\n");
482 return;
483 }
484
485 drm_dev_unregister(dev);
486 drm_dev_unref(dev);
487 }
488 EXPORT_SYMBOL(drm_put_dev);
489
drm_unplug_dev(struct drm_device * dev)490 void drm_unplug_dev(struct drm_device *dev)
491 {
492 /* for a USB device */
493 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
494 drm_minor_unregister(dev, DRM_MINOR_RENDER);
495 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
496
497 mutex_lock(&drm_global_mutex);
498 drm_device_set_unplugged(dev);
499
500 if (dev->open_count == 0) {
501 drm_put_dev(dev);
502 }
503 mutex_unlock(&drm_global_mutex);
504 }
505 EXPORT_SYMBOL(drm_unplug_dev);
506
507 #ifdef __NetBSD__
508
509 struct inode;
510
511 static struct inode *
drm_fs_inode_new(void)512 drm_fs_inode_new(void)
513 {
514 return NULL;
515 }
516
517 static void
drm_fs_inode_free(struct inode * inode)518 drm_fs_inode_free(struct inode *inode)
519 {
520 KASSERT(inode == NULL);
521 }
522
523 #else
524
525 /*
526 * DRM internal mount
527 * We want to be able to allocate our own "struct address_space" to control
528 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
529 * stand-alone address_space objects, so we need an underlying inode. As there
530 * is no way to allocate an independent inode easily, we need a fake internal
531 * VFS mount-point.
532 *
533 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
534 * frees it again. You are allowed to use iget() and iput() to get references to
535 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
536 * drm_fs_inode_free() call (which does not have to be the last iput()).
537 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
538 * between multiple inode-users. You could, technically, call
539 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
540 * iput(), but this way you'd end up with a new vfsmount for each inode.
541 */
542
543 static int drm_fs_cnt;
544 static struct vfsmount *drm_fs_mnt;
545
546 static const struct dentry_operations drm_fs_dops = {
547 .d_dname = simple_dname,
548 };
549
550 static const struct super_operations drm_fs_sops = {
551 .statfs = simple_statfs,
552 };
553
drm_fs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)554 static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
555 const char *dev_name, void *data)
556 {
557 return mount_pseudo(fs_type,
558 "drm:",
559 &drm_fs_sops,
560 &drm_fs_dops,
561 0x010203ff);
562 }
563
564 static struct file_system_type drm_fs_type = {
565 .name = "drm",
566 .owner = THIS_MODULE,
567 .mount = drm_fs_mount,
568 .kill_sb = kill_anon_super,
569 };
570
drm_fs_inode_new(void)571 static struct inode *drm_fs_inode_new(void)
572 {
573 struct inode *inode;
574 int r;
575
576 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
577 if (r < 0) {
578 DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
579 return ERR_PTR(r);
580 }
581
582 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
583 if (IS_ERR(inode))
584 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
585
586 return inode;
587 }
588
drm_fs_inode_free(struct inode * inode)589 static void drm_fs_inode_free(struct inode *inode)
590 {
591 if (inode) {
592 iput(inode);
593 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
594 }
595 }
596
597 #endif
598
599 /**
600 * drm_dev_alloc - Allocate new drm device
601 * @driver: DRM driver to allocate device for
602 * @parent: Parent device object
603 *
604 * Allocate and initialize a new DRM device. No device registration is done.
605 * Call drm_dev_register() to advertice the device to user space and register it
606 * with other core subsystems.
607 *
608 * The initial ref-count of the object is 1. Use drm_dev_ref() and
609 * drm_dev_unref() to take and drop further ref-counts.
610 *
611 * RETURNS:
612 * Pointer to new DRM device, or NULL if out of memory.
613 */
drm_dev_alloc(struct drm_driver * driver,struct device * parent)614 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
615 struct device *parent)
616 {
617 struct drm_device *dev;
618 int ret;
619
620 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
621 if (!dev)
622 return NULL;
623
624 kref_init(&dev->ref);
625 dev->dev = parent;
626 dev->driver = driver;
627
628 INIT_LIST_HEAD(&dev->filelist);
629 INIT_LIST_HEAD(&dev->ctxlist);
630 INIT_LIST_HEAD(&dev->vmalist);
631 INIT_LIST_HEAD(&dev->maplist);
632 INIT_LIST_HEAD(&dev->vblank_event_list);
633
634 spin_lock_init(&dev->count_lock);
635 spin_lock_init(&dev->event_lock);
636 #ifdef __NetBSD__
637 linux_mutex_init(&dev->struct_mutex);
638 linux_mutex_init(&dev->ctxlist_mutex);
639 linux_mutex_init(&dev->master_mutex);
640 #else
641 mutex_init(&dev->struct_mutex);
642 mutex_init(&dev->ctxlist_mutex);
643 mutex_init(&dev->master_mutex);
644 #endif
645
646 dev->anon_inode = drm_fs_inode_new();
647 if (IS_ERR(dev->anon_inode)) {
648 ret = PTR_ERR(dev->anon_inode);
649 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
650 goto err_free;
651 }
652
653 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
654 ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL);
655 if (ret)
656 goto err_minors;
657 }
658
659 if (drm_core_check_feature(dev, DRIVER_RENDER) && drm_rnodes) {
660 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
661 if (ret)
662 goto err_minors;
663 }
664
665 ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY);
666 if (ret)
667 goto err_minors;
668
669 if (drm_ht_create(&dev->map_hash, 12))
670 goto err_minors;
671
672 ret = drm_ctxbitmap_init(dev);
673 if (ret) {
674 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
675 goto err_ht;
676 }
677
678 if (driver->driver_features & DRIVER_GEM) {
679 ret = drm_gem_init(dev);
680 if (ret) {
681 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
682 goto err_ctxbitmap;
683 }
684 }
685
686 return dev;
687
688 err_ctxbitmap:
689 drm_ctxbitmap_cleanup(dev);
690 err_ht:
691 drm_ht_remove(&dev->map_hash);
692 err_minors:
693 drm_minor_free(dev, DRM_MINOR_LEGACY);
694 drm_minor_free(dev, DRM_MINOR_RENDER);
695 drm_minor_free(dev, DRM_MINOR_CONTROL);
696 drm_fs_inode_free(dev->anon_inode);
697 err_free:
698 #ifdef __NetBSD__
699 linux_mutex_destroy(&dev->struct_mutex);
700 linux_mutex_destroy(&dev->ctxlist_mutex);
701 linux_mutex_destroy(&dev->master_mutex);
702 spin_lock_destroy(&dev->event_lock);
703 spin_lock_destroy(&dev->count_lock);
704 #else
705 mutex_destroy(&dev->master_mutex);
706 #endif
707 kfree(dev);
708 return NULL;
709 }
710 EXPORT_SYMBOL(drm_dev_alloc);
711
drm_dev_release(struct kref * ref)712 static void drm_dev_release(struct kref *ref)
713 {
714 struct drm_device *dev = container_of(ref, struct drm_device, ref);
715
716 if (dev->driver->driver_features & DRIVER_GEM)
717 drm_gem_destroy(dev);
718
719 drm_ctxbitmap_cleanup(dev);
720 drm_ht_remove(&dev->map_hash);
721 drm_fs_inode_free(dev->anon_inode);
722
723 drm_minor_free(dev, DRM_MINOR_LEGACY);
724 drm_minor_free(dev, DRM_MINOR_RENDER);
725 drm_minor_free(dev, DRM_MINOR_CONTROL);
726
727 kfree(dev->devname);
728
729 #ifdef __NetBSD__
730 linux_mutex_destroy(&dev->struct_mutex);
731 linux_mutex_destroy(&dev->ctxlist_mutex);
732 linux_mutex_destroy(&dev->master_mutex);
733 spin_lock_destroy(&dev->event_lock);
734 spin_lock_destroy(&dev->count_lock);
735 #else
736 mutex_destroy(&dev->master_mutex);
737 #endif
738 kfree(dev);
739 }
740
741 /**
742 * drm_dev_ref - Take reference of a DRM device
743 * @dev: device to take reference of or NULL
744 *
745 * This increases the ref-count of @dev by one. You *must* already own a
746 * reference when calling this. Use drm_dev_unref() to drop this reference
747 * again.
748 *
749 * This function never fails. However, this function does not provide *any*
750 * guarantee whether the device is alive or running. It only provides a
751 * reference to the object and the memory associated with it.
752 */
drm_dev_ref(struct drm_device * dev)753 void drm_dev_ref(struct drm_device *dev)
754 {
755 if (dev)
756 kref_get(&dev->ref);
757 }
758 EXPORT_SYMBOL(drm_dev_ref);
759
760 /**
761 * drm_dev_unref - Drop reference of a DRM device
762 * @dev: device to drop reference of or NULL
763 *
764 * This decreases the ref-count of @dev by one. The device is destroyed if the
765 * ref-count drops to zero.
766 */
drm_dev_unref(struct drm_device * dev)767 void drm_dev_unref(struct drm_device *dev)
768 {
769 if (dev)
770 kref_put(&dev->ref, drm_dev_release);
771 }
772 EXPORT_SYMBOL(drm_dev_unref);
773
774 /**
775 * drm_dev_register - Register DRM device
776 * @dev: Device to register
777 *
778 * Register the DRM device @dev with the system, advertise device to user-space
779 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
780 * previously.
781 *
782 * Never call this twice on any device!
783 *
784 * RETURNS:
785 * 0 on success, negative error code on failure.
786 */
drm_dev_register(struct drm_device * dev,unsigned long flags)787 int drm_dev_register(struct drm_device *dev, unsigned long flags)
788 {
789 int ret;
790
791 #ifndef __NetBSD__
792 mutex_lock(&drm_global_mutex);
793 #endif
794
795 ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
796 if (ret)
797 goto err_minors;
798
799 ret = drm_minor_register(dev, DRM_MINOR_RENDER);
800 if (ret)
801 goto err_minors;
802
803 ret = drm_minor_register(dev, DRM_MINOR_LEGACY);
804 if (ret)
805 goto err_minors;
806
807 if (dev->driver->load) {
808 ret = dev->driver->load(dev, flags);
809 if (ret)
810 goto err_minors;
811 }
812
813 /* setup grouping for legacy outputs */
814 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
815 ret = drm_mode_group_init_legacy_group(dev,
816 &dev->primary->mode_group);
817 if (ret)
818 goto err_unload;
819 }
820
821 ret = 0;
822 goto out_unlock;
823
824 err_unload:
825 if (dev->driver->unload)
826 dev->driver->unload(dev);
827 err_minors:
828 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
829 drm_minor_unregister(dev, DRM_MINOR_RENDER);
830 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
831 out_unlock:
832 #ifndef __NetBSD__
833 mutex_unlock(&drm_global_mutex);
834 #endif
835 return ret;
836 }
837 EXPORT_SYMBOL(drm_dev_register);
838
839 /**
840 * drm_dev_unregister - Unregister DRM device
841 * @dev: Device to unregister
842 *
843 * Unregister the DRM device from the system. This does the reverse of
844 * drm_dev_register() but does not deallocate the device. The caller must call
845 * drm_dev_unref() to drop their final reference.
846 */
drm_dev_unregister(struct drm_device * dev)847 void drm_dev_unregister(struct drm_device *dev)
848 {
849 struct drm_map_list *r_list, *list_temp;
850
851 drm_lastclose(dev);
852
853 if (dev->driver->unload)
854 dev->driver->unload(dev);
855
856 #ifndef __NetBSD__ /* Moved to drm_pci. */
857 if (dev->agp)
858 drm_pci_agp_destroy(dev);
859 #endif
860
861 drm_vblank_cleanup(dev);
862
863 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
864 drm_rmmap(dev, r_list->map);
865
866 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
867 drm_minor_unregister(dev, DRM_MINOR_RENDER);
868 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
869 }
870 EXPORT_SYMBOL(drm_dev_unregister);
871