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1da177e4 LT |
1 | /* |
2 | * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org | |
3 | * | |
4 | * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California. | |
5 | * All Rights Reserved. | |
6 | * | |
c6a1af8a TR |
7 | * Author Rickard E. (Rik) Faith <faith@valinux.com> |
8 | * | |
1da177e4 LT |
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: | |
15 | * | |
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 | |
18 | * Software. | |
19 | * | |
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. | |
27 | */ | |
28 | ||
1b7199fe | 29 | #include <linux/debugfs.h> |
31bbe16f | 30 | #include <linux/fs.h> |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | #include <linux/moduleparam.h> | |
31bbe16f | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
bee330f3 | 35 | #include <linux/srcu.h> |
85e634bc | 36 | |
c76f0f7c | 37 | #include <drm/drm_client.h> |
85e634bc | 38 | #include <drm/drm_drv.h> |
760285e7 | 39 | #include <drm/drmP.h> |
85e634bc | 40 | |
79190ea2 | 41 | #include "drm_crtc_internal.h" |
e7b96070 | 42 | #include "drm_legacy.h" |
67d0ec4e | 43 | #include "drm_internal.h" |
1da177e4 | 44 | |
6dc3e22e EG |
45 | /* |
46 | * drm_debug: Enable debug output. | |
47 | * Bitmask of DRM_UT_x. See include/drm/drmP.h for details. | |
48 | */ | |
49 | unsigned int drm_debug = 0; | |
1da177e4 LT |
50 | EXPORT_SYMBOL(drm_debug); |
51 | ||
82d5e73f DH |
52 | MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
53 | MODULE_DESCRIPTION("DRM shared core routines"); | |
1da177e4 | 54 | MODULE_LICENSE("GPL and additional rights"); |
6dc3e22e | 55 | MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n" |
a18b2192 LP |
56 | "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n" |
57 | "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n" | |
58 | "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n" | |
59 | "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n" | |
60 | "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n" | |
61 | "\t\tBit 5 (0x20) will enable VBL messages (vblank code)\n" | |
62 | "\t\tBit 7 (0x80) will enable LEASE messages (leasing code)\n" | |
63 | "\t\tBit 8 (0x100) will enable DP messages (displayport code)"); | |
c0758146 | 64 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 65 | |
0d639883 | 66 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 67 | static struct idr drm_minors_idr; |
2c14f28b | 68 | |
371c2279 AM |
69 | /* |
70 | * If the drm core fails to init for whatever reason, | |
71 | * we should prevent any drivers from registering with it. | |
72 | * It's best to check this at drm_dev_init(), as some drivers | |
73 | * prefer to embed struct drm_device into their own device | |
74 | * structure and call drm_dev_init() themselves. | |
75 | */ | |
76 | static bool drm_core_init_complete = false; | |
77 | ||
1b7199fe | 78 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 79 | |
bee330f3 NT |
80 | DEFINE_STATIC_SRCU(drm_unplug_srcu); |
81 | ||
0d639883 DH |
82 | /* |
83 | * DRM Minors | |
84 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
85 | * of them is represented by a drm_minor object. Depending on the capabilities | |
86 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 87 | * |
0d639883 DH |
88 | * Minors can be accessed via dev->$minor_name. This pointer is either |
89 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
90 | * valid. This means, DRM minors have the same life-time as the underlying | |
91 | * device. However, this doesn't mean that the minor is active. Minors are | |
92 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 93 | */ |
0d639883 | 94 | |
05b701f6 DH |
95 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
96 | unsigned int type) | |
97 | { | |
98 | switch (type) { | |
a3ccc461 | 99 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
100 | return &dev->primary; |
101 | case DRM_MINOR_RENDER: | |
102 | return &dev->render; | |
05b701f6 | 103 | default: |
3bd07ccd | 104 | BUG(); |
05b701f6 DH |
105 | } |
106 | } | |
107 | ||
108 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
109 | { | |
110 | struct drm_minor *minor; | |
f1b85962 DH |
111 | unsigned long flags; |
112 | int r; | |
05b701f6 DH |
113 | |
114 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
115 | if (!minor) | |
116 | return -ENOMEM; | |
117 | ||
118 | minor->type = type; | |
119 | minor->dev = dev; | |
05b701f6 | 120 | |
f1b85962 DH |
121 | idr_preload(GFP_KERNEL); |
122 | spin_lock_irqsave(&drm_minor_lock, flags); | |
123 | r = idr_alloc(&drm_minors_idr, | |
124 | NULL, | |
125 | 64 * type, | |
126 | 64 * (type + 1), | |
127 | GFP_NOWAIT); | |
128 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
129 | idr_preload_end(); | |
130 | ||
131 | if (r < 0) | |
132 | goto err_free; | |
133 | ||
134 | minor->index = r; | |
135 | ||
e1728075 DH |
136 | minor->kdev = drm_sysfs_minor_alloc(minor); |
137 | if (IS_ERR(minor->kdev)) { | |
138 | r = PTR_ERR(minor->kdev); | |
139 | goto err_index; | |
140 | } | |
141 | ||
05b701f6 DH |
142 | *drm_minor_get_slot(dev, type) = minor; |
143 | return 0; | |
f1b85962 | 144 | |
e1728075 DH |
145 | err_index: |
146 | spin_lock_irqsave(&drm_minor_lock, flags); | |
147 | idr_remove(&drm_minors_idr, minor->index); | |
148 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
149 | err_free: |
150 | kfree(minor); | |
151 | return r; | |
05b701f6 DH |
152 | } |
153 | ||
bd9dfa98 DH |
154 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
155 | { | |
f1b85962 DH |
156 | struct drm_minor **slot, *minor; |
157 | unsigned long flags; | |
bd9dfa98 DH |
158 | |
159 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
160 | minor = *slot; |
161 | if (!minor) | |
162 | return; | |
163 | ||
e1728075 | 164 | put_device(minor->kdev); |
f1b85962 DH |
165 | |
166 | spin_lock_irqsave(&drm_minor_lock, flags); | |
167 | idr_remove(&drm_minors_idr, minor->index); | |
168 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
169 | ||
170 | kfree(minor); | |
171 | *slot = NULL; | |
bd9dfa98 DH |
172 | } |
173 | ||
afcdbc86 | 174 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 175 | { |
f1b85962 | 176 | struct drm_minor *minor; |
0d639883 | 177 | unsigned long flags; |
1da177e4 | 178 | int ret; |
1da177e4 LT |
179 | |
180 | DRM_DEBUG("\n"); | |
181 | ||
f1b85962 DH |
182 | minor = *drm_minor_get_slot(dev, type); |
183 | if (!minor) | |
05b701f6 DH |
184 | return 0; |
185 | ||
f1b85962 | 186 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 187 | if (ret) { |
156f5a78 | 188 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
a67834f8 | 189 | goto err_debugfs; |
955b12de | 190 | } |
2c14f28b | 191 | |
e1728075 DH |
192 | ret = device_add(minor->kdev); |
193 | if (ret) | |
cb6458f9 | 194 | goto err_debugfs; |
2c14f28b | 195 | |
0d639883 DH |
196 | /* replace NULL with @minor so lookups will succeed from now on */ |
197 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 198 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 199 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 200 | |
f1b85962 | 201 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
202 | return 0; |
203 | ||
cb6458f9 | 204 | err_debugfs: |
f1b85962 | 205 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
206 | return ret; |
207 | } | |
b5e89ed5 | 208 | |
afcdbc86 | 209 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 210 | { |
afcdbc86 | 211 | struct drm_minor *minor; |
0d639883 | 212 | unsigned long flags; |
afcdbc86 DH |
213 | |
214 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 215 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
216 | return; |
217 | ||
f1b85962 | 218 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 219 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 220 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 221 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 222 | |
e1728075 DH |
223 | device_del(minor->kdev); |
224 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 225 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
226 | } |
227 | ||
85e634bc | 228 | /* |
1616c525 DH |
229 | * Looks up the given minor-ID and returns the respective DRM-minor object. The |
230 | * refence-count of the underlying device is increased so you must release this | |
231 | * object with drm_minor_release(). | |
232 | * | |
233 | * As long as you hold this minor, it is guaranteed that the object and the | |
234 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
235 | * unregistered while you hold the minor. | |
1da177e4 | 236 | */ |
1616c525 | 237 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 238 | { |
1616c525 | 239 | struct drm_minor *minor; |
0d639883 | 240 | unsigned long flags; |
1616c525 | 241 | |
0d639883 | 242 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 243 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 | 244 | if (minor) |
9a96f550 | 245 | drm_dev_get(minor->dev); |
0d639883 DH |
246 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
247 | ||
248 | if (!minor) { | |
249 | return ERR_PTR(-ENODEV); | |
c07dcd61 | 250 | } else if (drm_dev_is_unplugged(minor->dev)) { |
9a96f550 | 251 | drm_dev_put(minor->dev); |
1616c525 | 252 | return ERR_PTR(-ENODEV); |
0d639883 | 253 | } |
673a394b | 254 | |
1616c525 DH |
255 | return minor; |
256 | } | |
b5e89ed5 | 257 | |
1616c525 DH |
258 | void drm_minor_release(struct drm_minor *minor) |
259 | { | |
9a96f550 | 260 | drm_dev_put(minor->dev); |
1da177e4 | 261 | } |
112b715e | 262 | |
6e3f797c DV |
263 | /** |
264 | * DOC: driver instance overview | |
265 | * | |
ea0dd85a | 266 | * A device instance for a drm driver is represented by &struct drm_device. This |
6e3f797c DV |
267 | * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() |
268 | * callbacks implemented by the driver. The driver then needs to initialize all | |
269 | * the various subsystems for the drm device like memory management, vblank | |
270 | * handling, modesetting support and intial output configuration plus obviously | |
a6b5fac5 GH |
271 | * initialize all the corresponding hardware bits. An important part of this is |
272 | * also calling drm_dev_set_unique() to set the userspace-visible unique name of | |
273 | * this device instance. Finally when everything is up and running and ready for | |
274 | * userspace the device instance can be published using drm_dev_register(). | |
6e3f797c DV |
275 | * |
276 | * There is also deprecated support for initalizing device instances using | |
ef40cbf9 | 277 | * bus-specific helpers and the &drm_driver.load callback. But due to |
6e3f797c DV |
278 | * backwards-compatibility needs the device instance have to be published too |
279 | * early, which requires unpretty global locking to make safe and is therefore | |
280 | * only support for existing drivers not yet converted to the new scheme. | |
281 | * | |
282 | * When cleaning up a device instance everything needs to be done in reverse: | |
283 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
284 | * any other resources allocated at device initialization and drop the driver's | |
9a96f550 | 285 | * reference to &drm_device using drm_dev_put(). |
6e3f797c DV |
286 | * |
287 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
288 | * historical baggage. Hence use the reference counting provided by | |
9a96f550 | 289 | * drm_dev_get() and drm_dev_put() only carefully. |
6e3f797c | 290 | * |
ea0dd85a | 291 | * It is recommended that drivers embed &struct drm_device into their own device |
d82faafd | 292 | * structure, which is supported through drm_dev_init(). |
6e3f797c DV |
293 | */ |
294 | ||
112b715e | 295 | /** |
c6a1af8a TR |
296 | * drm_put_dev - Unregister and release a DRM device |
297 | * @dev: DRM device | |
112b715e | 298 | * |
c6a1af8a | 299 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 300 | * |
c6a1af8a | 301 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
302 | * |
303 | * Note: Use of this function is deprecated. It will eventually go away | |
9a96f550 | 304 | * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly |
6e3f797c DV |
305 | * instead to make sure that the device isn't userspace accessible any more |
306 | * while teardown is in progress, ensuring that userspace can't access an | |
307 | * inconsistent state. | |
112b715e KH |
308 | */ |
309 | void drm_put_dev(struct drm_device *dev) | |
310 | { | |
112b715e KH |
311 | DRM_DEBUG("\n"); |
312 | ||
313 | if (!dev) { | |
314 | DRM_ERROR("cleanup called no dev\n"); | |
315 | return; | |
316 | } | |
317 | ||
c3a49737 | 318 | drm_dev_unregister(dev); |
9a96f550 | 319 | drm_dev_put(dev); |
112b715e KH |
320 | } |
321 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d | 322 | |
bee330f3 NT |
323 | /** |
324 | * drm_dev_enter - Enter device critical section | |
325 | * @dev: DRM device | |
326 | * @idx: Pointer to index that will be passed to the matching drm_dev_exit() | |
327 | * | |
328 | * This function marks and protects the beginning of a section that should not | |
329 | * be entered after the device has been unplugged. The section end is marked | |
330 | * with drm_dev_exit(). Calls to this function can be nested. | |
331 | * | |
332 | * Returns: | |
333 | * True if it is OK to enter the section, false otherwise. | |
334 | */ | |
335 | bool drm_dev_enter(struct drm_device *dev, int *idx) | |
c07dcd61 | 336 | { |
bee330f3 NT |
337 | *idx = srcu_read_lock(&drm_unplug_srcu); |
338 | ||
339 | if (dev->unplugged) { | |
340 | srcu_read_unlock(&drm_unplug_srcu, *idx); | |
341 | return false; | |
342 | } | |
343 | ||
344 | return true; | |
c07dcd61 | 345 | } |
bee330f3 NT |
346 | EXPORT_SYMBOL(drm_dev_enter); |
347 | ||
348 | /** | |
349 | * drm_dev_exit - Exit device critical section | |
350 | * @idx: index returned from drm_dev_enter() | |
351 | * | |
352 | * This function marks the end of a section that should not be entered after | |
353 | * the device has been unplugged. | |
354 | */ | |
355 | void drm_dev_exit(int idx) | |
c07dcd61 | 356 | { |
bee330f3 | 357 | srcu_read_unlock(&drm_unplug_srcu, idx); |
c07dcd61 | 358 | } |
bee330f3 | 359 | EXPORT_SYMBOL(drm_dev_exit); |
c07dcd61 DV |
360 | |
361 | /** | |
362 | * drm_dev_unplug - unplug a DRM device | |
363 | * @dev: DRM device | |
364 | * | |
365 | * This unplugs a hotpluggable DRM device, which makes it inaccessible to | |
bee330f3 NT |
366 | * userspace operations. Entry-points can use drm_dev_enter() and |
367 | * drm_dev_exit() to protect device resources in a race free manner. This | |
c07dcd61 DV |
368 | * essentially unregisters the device like drm_dev_unregister(), but can be |
369 | * called while there are still open users of @dev. | |
370 | */ | |
371 | void drm_dev_unplug(struct drm_device *dev) | |
2c07a21d | 372 | { |
bee330f3 NT |
373 | /* |
374 | * After synchronizing any critical read section is guaranteed to see | |
375 | * the new value of ->unplugged, and any critical section which might | |
376 | * still have seen the old value of ->unplugged is guaranteed to have | |
377 | * finished. | |
378 | */ | |
379 | dev->unplugged = true; | |
380 | synchronize_srcu(&drm_unplug_srcu); | |
069035c5 OA |
381 | |
382 | drm_dev_unregister(dev); | |
383 | ||
384 | mutex_lock(&drm_global_mutex); | |
385 | if (dev->open_count == 0) | |
386 | drm_dev_put(dev); | |
387 | mutex_unlock(&drm_global_mutex); | |
2c07a21d | 388 | } |
c07dcd61 | 389 | EXPORT_SYMBOL(drm_dev_unplug); |
1bb72532 | 390 | |
31bbe16f DH |
391 | /* |
392 | * DRM internal mount | |
393 | * We want to be able to allocate our own "struct address_space" to control | |
394 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
395 | * stand-alone address_space objects, so we need an underlying inode. As there | |
396 | * is no way to allocate an independent inode easily, we need a fake internal | |
397 | * VFS mount-point. | |
398 | * | |
399 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
400 | * frees it again. You are allowed to use iget() and iput() to get references to | |
401 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
402 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
403 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
404 | * between multiple inode-users. You could, technically, call | |
405 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
406 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
407 | */ | |
408 | ||
409 | static int drm_fs_cnt; | |
410 | static struct vfsmount *drm_fs_mnt; | |
411 | ||
412 | static const struct dentry_operations drm_fs_dops = { | |
413 | .d_dname = simple_dname, | |
414 | }; | |
415 | ||
416 | static const struct super_operations drm_fs_sops = { | |
417 | .statfs = simple_statfs, | |
418 | }; | |
419 | ||
420 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
421 | const char *dev_name, void *data) | |
422 | { | |
423 | return mount_pseudo(fs_type, | |
424 | "drm:", | |
425 | &drm_fs_sops, | |
426 | &drm_fs_dops, | |
427 | 0x010203ff); | |
428 | } | |
429 | ||
430 | static struct file_system_type drm_fs_type = { | |
431 | .name = "drm", | |
432 | .owner = THIS_MODULE, | |
433 | .mount = drm_fs_mount, | |
434 | .kill_sb = kill_anon_super, | |
435 | }; | |
436 | ||
437 | static struct inode *drm_fs_inode_new(void) | |
438 | { | |
439 | struct inode *inode; | |
440 | int r; | |
441 | ||
442 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
443 | if (r < 0) { | |
444 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
445 | return ERR_PTR(r); | |
446 | } | |
447 | ||
448 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
449 | if (IS_ERR(inode)) | |
450 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
451 | ||
452 | return inode; | |
453 | } | |
454 | ||
455 | static void drm_fs_inode_free(struct inode *inode) | |
456 | { | |
457 | if (inode) { | |
458 | iput(inode); | |
459 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
460 | } | |
461 | } | |
462 | ||
1bb72532 | 463 | /** |
b209aca3 CW |
464 | * drm_dev_init - Initialise new DRM device |
465 | * @dev: DRM device | |
466 | * @driver: DRM driver | |
1bb72532 DH |
467 | * @parent: Parent device object |
468 | * | |
b209aca3 | 469 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 470 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
471 | * with other core subsystems. This should be done last in the device |
472 | * initialization sequence to make sure userspace can't access an inconsistent | |
473 | * state. | |
1bb72532 | 474 | * |
9a96f550 AP |
475 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
476 | * drm_dev_put() to take and drop further ref-counts. | |
099d1c29 | 477 | * |
b209aca3 | 478 | * Drivers that do not want to allocate their own device struct |
ea0dd85a DV |
479 | * embedding &struct drm_device can call drm_dev_alloc() instead. For drivers |
480 | * that do embed &struct drm_device it must be placed first in the overall | |
d82faafd DV |
481 | * structure, and the overall structure must be allocated using kmalloc(): The |
482 | * drm core's release function unconditionally calls kfree() on the @dev pointer | |
f30c9257 CW |
483 | * when the final reference is released. To override this behaviour, and so |
484 | * allow embedding of the drm_device inside the driver's device struct at an | |
485 | * arbitrary offset, you must supply a &drm_driver.release callback and control | |
486 | * the finalization explicitly. | |
b209aca3 | 487 | * |
1bb72532 | 488 | * RETURNS: |
b209aca3 | 489 | * 0 on success, or error code on failure. |
1bb72532 | 490 | */ |
b209aca3 CW |
491 | int drm_dev_init(struct drm_device *dev, |
492 | struct drm_driver *driver, | |
493 | struct device *parent) | |
1bb72532 | 494 | { |
1bb72532 DH |
495 | int ret; |
496 | ||
371c2279 AM |
497 | if (!drm_core_init_complete) { |
498 | DRM_ERROR("DRM core is not initialized\n"); | |
499 | return -ENODEV; | |
500 | } | |
501 | ||
f08877e7 EV |
502 | BUG_ON(!parent); |
503 | ||
099d1c29 | 504 | kref_init(&dev->ref); |
1bb72532 DH |
505 | dev->dev = parent; |
506 | dev->driver = driver; | |
507 | ||
18ace11f VS |
508 | /* no per-device feature limits by default */ |
509 | dev->driver_features = ~0u; | |
510 | ||
1bb72532 | 511 | INIT_LIST_HEAD(&dev->filelist); |
c76f0f7c NT |
512 | INIT_LIST_HEAD(&dev->filelist_internal); |
513 | INIT_LIST_HEAD(&dev->clientlist); | |
1bb72532 DH |
514 | INIT_LIST_HEAD(&dev->ctxlist); |
515 | INIT_LIST_HEAD(&dev->vmalist); | |
516 | INIT_LIST_HEAD(&dev->maplist); | |
517 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
518 | ||
2177a218 | 519 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
520 | spin_lock_init(&dev->event_lock); |
521 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 522 | mutex_init(&dev->filelist_mutex); |
c76f0f7c | 523 | mutex_init(&dev->clientlist_mutex); |
1bb72532 | 524 | mutex_init(&dev->ctxlist_mutex); |
c996fd0b | 525 | mutex_init(&dev->master_mutex); |
1bb72532 | 526 | |
6796cb16 DH |
527 | dev->anon_inode = drm_fs_inode_new(); |
528 | if (IS_ERR(dev->anon_inode)) { | |
529 | ret = PTR_ERR(dev->anon_inode); | |
530 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 531 | goto err_free; |
6796cb16 DH |
532 | } |
533 | ||
6d6dfcfb | 534 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
535 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
536 | if (ret) | |
537 | goto err_minors; | |
538 | } | |
539 | ||
a3ccc461 | 540 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 DH |
541 | if (ret) |
542 | goto err_minors; | |
543 | ||
b209aca3 CW |
544 | ret = drm_ht_create(&dev->map_hash, 12); |
545 | if (ret) | |
05b701f6 | 546 | goto err_minors; |
1bb72532 | 547 | |
ba6976c1 | 548 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 549 | |
1bcecfac | 550 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
551 | ret = drm_gem_init(dev); |
552 | if (ret) { | |
553 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
554 | goto err_ctxbitmap; | |
555 | } | |
556 | } | |
557 | ||
f08877e7 | 558 | ret = drm_dev_set_unique(dev, dev_name(parent)); |
5079c464 DV |
559 | if (ret) |
560 | goto err_setunique; | |
e112e593 | 561 | |
b209aca3 | 562 | return 0; |
1bb72532 | 563 | |
e112e593 NI |
564 | err_setunique: |
565 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
566 | drm_gem_destroy(dev); | |
1bb72532 | 567 | err_ctxbitmap: |
e7b96070 | 568 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 569 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 570 | err_minors: |
a3ccc461 | 571 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 | 572 | drm_minor_free(dev, DRM_MINOR_RENDER); |
6796cb16 | 573 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 574 | err_free: |
c996fd0b | 575 | mutex_destroy(&dev->master_mutex); |
f92e1ee5 | 576 | mutex_destroy(&dev->ctxlist_mutex); |
c76f0f7c | 577 | mutex_destroy(&dev->clientlist_mutex); |
f92e1ee5 JL |
578 | mutex_destroy(&dev->filelist_mutex); |
579 | mutex_destroy(&dev->struct_mutex); | |
b209aca3 CW |
580 | return ret; |
581 | } | |
582 | EXPORT_SYMBOL(drm_dev_init); | |
583 | ||
f30c9257 CW |
584 | /** |
585 | * drm_dev_fini - Finalize a dead DRM device | |
586 | * @dev: DRM device | |
587 | * | |
588 | * Finalize a dead DRM device. This is the converse to drm_dev_init() and | |
589 | * frees up all data allocated by it. All driver private data should be | |
590 | * finalized first. Note that this function does not free the @dev, that is | |
591 | * left to the caller. | |
592 | * | |
593 | * The ref-count of @dev must be zero, and drm_dev_fini() should only be called | |
594 | * from a &drm_driver.release callback. | |
595 | */ | |
596 | void drm_dev_fini(struct drm_device *dev) | |
597 | { | |
598 | drm_vblank_cleanup(dev); | |
599 | ||
600 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
601 | drm_gem_destroy(dev); | |
602 | ||
603 | drm_legacy_ctxbitmap_cleanup(dev); | |
604 | drm_ht_remove(&dev->map_hash); | |
605 | drm_fs_inode_free(dev->anon_inode); | |
606 | ||
607 | drm_minor_free(dev, DRM_MINOR_PRIMARY); | |
608 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
f30c9257 CW |
609 | |
610 | mutex_destroy(&dev->master_mutex); | |
611 | mutex_destroy(&dev->ctxlist_mutex); | |
c76f0f7c | 612 | mutex_destroy(&dev->clientlist_mutex); |
f30c9257 CW |
613 | mutex_destroy(&dev->filelist_mutex); |
614 | mutex_destroy(&dev->struct_mutex); | |
615 | kfree(dev->unique); | |
616 | } | |
617 | EXPORT_SYMBOL(drm_dev_fini); | |
618 | ||
b209aca3 CW |
619 | /** |
620 | * drm_dev_alloc - Allocate new DRM device | |
621 | * @driver: DRM driver to allocate device for | |
622 | * @parent: Parent device object | |
623 | * | |
624 | * Allocate and initialize a new DRM device. No device registration is done. | |
625 | * Call drm_dev_register() to advertice the device to user space and register it | |
626 | * with other core subsystems. This should be done last in the device | |
627 | * initialization sequence to make sure userspace can't access an inconsistent | |
628 | * state. | |
629 | * | |
9a96f550 AP |
630 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
631 | * drm_dev_put() to take and drop further ref-counts. | |
b209aca3 CW |
632 | * |
633 | * Note that for purely virtual devices @parent can be NULL. | |
634 | * | |
ea0dd85a | 635 | * Drivers that wish to subclass or embed &struct drm_device into their |
b209aca3 CW |
636 | * own struct should look at using drm_dev_init() instead. |
637 | * | |
638 | * RETURNS: | |
0f288605 | 639 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 CW |
640 | */ |
641 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
642 | struct device *parent) | |
643 | { | |
644 | struct drm_device *dev; | |
645 | int ret; | |
646 | ||
647 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
648 | if (!dev) | |
0f288605 | 649 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
650 | |
651 | ret = drm_dev_init(dev, driver, parent); | |
652 | if (ret) { | |
653 | kfree(dev); | |
0f288605 | 654 | return ERR_PTR(ret); |
b209aca3 CW |
655 | } |
656 | ||
657 | return dev; | |
1bb72532 DH |
658 | } |
659 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 660 | |
099d1c29 | 661 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 662 | { |
099d1c29 | 663 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 664 | |
f30c9257 CW |
665 | if (dev->driver->release) { |
666 | dev->driver->release(dev); | |
667 | } else { | |
668 | drm_dev_fini(dev); | |
669 | kfree(dev); | |
670 | } | |
0dc8fe59 | 671 | } |
099d1c29 DH |
672 | |
673 | /** | |
9a96f550 | 674 | * drm_dev_get - Take reference of a DRM device |
099d1c29 DH |
675 | * @dev: device to take reference of or NULL |
676 | * | |
677 | * This increases the ref-count of @dev by one. You *must* already own a | |
9a96f550 | 678 | * reference when calling this. Use drm_dev_put() to drop this reference |
099d1c29 DH |
679 | * again. |
680 | * | |
681 | * This function never fails. However, this function does not provide *any* | |
682 | * guarantee whether the device is alive or running. It only provides a | |
683 | * reference to the object and the memory associated with it. | |
684 | */ | |
9a96f550 | 685 | void drm_dev_get(struct drm_device *dev) |
099d1c29 DH |
686 | { |
687 | if (dev) | |
688 | kref_get(&dev->ref); | |
689 | } | |
9a96f550 | 690 | EXPORT_SYMBOL(drm_dev_get); |
099d1c29 DH |
691 | |
692 | /** | |
9a96f550 | 693 | * drm_dev_put - Drop reference of a DRM device |
099d1c29 DH |
694 | * @dev: device to drop reference of or NULL |
695 | * | |
696 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
697 | * ref-count drops to zero. | |
698 | */ | |
9a96f550 | 699 | void drm_dev_put(struct drm_device *dev) |
099d1c29 DH |
700 | { |
701 | if (dev) | |
702 | kref_put(&dev->ref, drm_dev_release); | |
703 | } | |
9a96f550 AP |
704 | EXPORT_SYMBOL(drm_dev_put); |
705 | ||
6449b088 DV |
706 | static int create_compat_control_link(struct drm_device *dev) |
707 | { | |
708 | struct drm_minor *minor; | |
709 | char *name; | |
710 | int ret; | |
711 | ||
712 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
713 | return 0; | |
714 | ||
715 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
716 | if (!minor) | |
717 | return 0; | |
718 | ||
719 | /* | |
720 | * Some existing userspace out there uses the existing of the controlD* | |
721 | * sysfs files to figure out whether it's a modeset driver. It only does | |
722 | * readdir, hence a symlink is sufficient (and the least confusing | |
723 | * option). Otherwise controlD* is entirely unused. | |
724 | * | |
725 | * Old controlD chardev have been allocated in the range | |
726 | * 64-127. | |
727 | */ | |
728 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); | |
729 | if (!name) | |
730 | return -ENOMEM; | |
731 | ||
732 | ret = sysfs_create_link(minor->kdev->kobj.parent, | |
733 | &minor->kdev->kobj, | |
734 | name); | |
735 | ||
736 | kfree(name); | |
737 | ||
738 | return ret; | |
739 | } | |
740 | ||
741 | static void remove_compat_control_link(struct drm_device *dev) | |
742 | { | |
743 | struct drm_minor *minor; | |
744 | char *name; | |
745 | ||
746 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
747 | return; | |
748 | ||
749 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
750 | if (!minor) | |
751 | return; | |
752 | ||
7f6df440 | 753 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
6449b088 DV |
754 | if (!name) |
755 | return; | |
756 | ||
757 | sysfs_remove_link(minor->kdev->kobj.parent, name); | |
758 | ||
759 | kfree(name); | |
760 | } | |
761 | ||
c22f0ace DH |
762 | /** |
763 | * drm_dev_register - Register DRM device | |
764 | * @dev: Device to register | |
c6a1af8a | 765 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
766 | * |
767 | * Register the DRM device @dev with the system, advertise device to user-space | |
768 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
e28cd4d0 | 769 | * previously. |
c22f0ace DH |
770 | * |
771 | * Never call this twice on any device! | |
772 | * | |
6e3f797c | 773 | * NOTE: To ensure backward compatibility with existing drivers method this |
ef40cbf9 DV |
774 | * function calls the &drm_driver.load method after registering the device |
775 | * nodes, creating race conditions. Usage of the &drm_driver.load methods is | |
776 | * therefore deprecated, drivers must perform all initialization before calling | |
6e3f797c DV |
777 | * drm_dev_register(). |
778 | * | |
c22f0ace DH |
779 | * RETURNS: |
780 | * 0 on success, negative error code on failure. | |
781 | */ | |
782 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
783 | { | |
75f6dfe3 | 784 | struct drm_driver *driver = dev->driver; |
c22f0ace DH |
785 | int ret; |
786 | ||
787 | mutex_lock(&drm_global_mutex); | |
788 | ||
afcdbc86 | 789 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
790 | if (ret) |
791 | goto err_minors; | |
c22f0ace | 792 | |
a3ccc461 | 793 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 794 | if (ret) |
05b701f6 | 795 | goto err_minors; |
c22f0ace | 796 | |
6449b088 DV |
797 | ret = create_compat_control_link(dev); |
798 | if (ret) | |
799 | goto err_minors; | |
800 | ||
e6e7b48b DV |
801 | dev->registered = true; |
802 | ||
c22f0ace DH |
803 | if (dev->driver->load) { |
804 | ret = dev->driver->load(dev, flags); | |
805 | if (ret) | |
05b701f6 | 806 | goto err_minors; |
c22f0ace DH |
807 | } |
808 | ||
bee7fb15 | 809 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 810 | drm_modeset_register_all(dev); |
e28cd4d0 | 811 | |
c22f0ace | 812 | ret = 0; |
75f6dfe3 GKB |
813 | |
814 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", | |
815 | driver->name, driver->major, driver->minor, | |
6098909c CW |
816 | driver->patchlevel, driver->date, |
817 | dev->dev ? dev_name(dev->dev) : "virtual device", | |
75f6dfe3 GKB |
818 | dev->primary->index); |
819 | ||
c22f0ace DH |
820 | goto out_unlock; |
821 | ||
05b701f6 | 822 | err_minors: |
6449b088 | 823 | remove_compat_control_link(dev); |
a3ccc461 | 824 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 825 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c22f0ace DH |
826 | out_unlock: |
827 | mutex_unlock(&drm_global_mutex); | |
828 | return ret; | |
829 | } | |
830 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
831 | |
832 | /** | |
833 | * drm_dev_unregister - Unregister DRM device | |
834 | * @dev: Device to unregister | |
835 | * | |
836 | * Unregister the DRM device from the system. This does the reverse of | |
837 | * drm_dev_register() but does not deallocate the device. The caller must call | |
9a96f550 | 838 | * drm_dev_put() to drop their final reference. |
6e3f797c | 839 | * |
c07dcd61 DV |
840 | * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), |
841 | * which can be called while there are still open users of @dev. | |
842 | * | |
6e3f797c DV |
843 | * This should be called first in the device teardown code to make sure |
844 | * userspace can't access the device instance any more. | |
c3a49737 DH |
845 | */ |
846 | void drm_dev_unregister(struct drm_device *dev) | |
847 | { | |
848 | struct drm_map_list *r_list, *list_temp; | |
849 | ||
2e45eeac DV |
850 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
851 | drm_lastclose(dev); | |
c3a49737 | 852 | |
e6e7b48b DV |
853 | dev->registered = false; |
854 | ||
c76f0f7c NT |
855 | drm_client_dev_unregister(dev); |
856 | ||
bee7fb15 | 857 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 858 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 859 | |
c3a49737 DH |
860 | if (dev->driver->unload) |
861 | dev->driver->unload(dev); | |
862 | ||
4efafebe DV |
863 | if (dev->agp) |
864 | drm_pci_agp_destroy(dev); | |
c3a49737 | 865 | |
c3a49737 | 866 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) |
9fc5cde7 | 867 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 868 | |
6449b088 | 869 | remove_compat_control_link(dev); |
a3ccc461 | 870 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 871 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c3a49737 DH |
872 | } |
873 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 874 | |
a6b5fac5 GH |
875 | /** |
876 | * drm_dev_set_unique - Set the unique name of a DRM device | |
877 | * @dev: device of which to set the unique name | |
878 | * @name: unique name | |
879 | * | |
880 | * Sets the unique name of a DRM device using the specified string. Drivers | |
881 | * can use this at driver probe time if the unique name of the devices they | |
882 | * drive is static. | |
883 | * | |
884 | * Return: 0 on success or a negative error code on failure. | |
885 | */ | |
886 | int drm_dev_set_unique(struct drm_device *dev, const char *name) | |
887 | { | |
888 | kfree(dev->unique); | |
889 | dev->unique = kstrdup(name, GFP_KERNEL); | |
890 | ||
891 | return dev->unique ? 0 : -ENOMEM; | |
892 | } | |
893 | EXPORT_SYMBOL(drm_dev_set_unique); | |
894 | ||
1b7199fe DH |
895 | /* |
896 | * DRM Core | |
897 | * The DRM core module initializes all global DRM objects and makes them | |
898 | * available to drivers. Once setup, drivers can probe their respective | |
899 | * devices. | |
900 | * Currently, core management includes: | |
901 | * - The "DRM-Global" key/value database | |
902 | * - Global ID management for connectors | |
903 | * - DRM major number allocation | |
904 | * - DRM minor management | |
905 | * - DRM sysfs class | |
906 | * - DRM debugfs root | |
907 | * | |
908 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
909 | * interface registered on a DRM device, you can request minor numbers from DRM | |
910 | * core. DRM core takes care of major-number management and char-dev | |
911 | * registration. A stub ->open() callback forwards any open() requests to the | |
912 | * registered minor. | |
913 | */ | |
914 | ||
915 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
916 | { | |
917 | const struct file_operations *new_fops; | |
918 | struct drm_minor *minor; | |
919 | int err; | |
920 | ||
921 | DRM_DEBUG("\n"); | |
922 | ||
923 | mutex_lock(&drm_global_mutex); | |
924 | minor = drm_minor_acquire(iminor(inode)); | |
925 | if (IS_ERR(minor)) { | |
926 | err = PTR_ERR(minor); | |
927 | goto out_unlock; | |
928 | } | |
929 | ||
930 | new_fops = fops_get(minor->dev->driver->fops); | |
931 | if (!new_fops) { | |
932 | err = -ENODEV; | |
933 | goto out_release; | |
934 | } | |
935 | ||
936 | replace_fops(filp, new_fops); | |
937 | if (filp->f_op->open) | |
938 | err = filp->f_op->open(inode, filp); | |
939 | else | |
940 | err = 0; | |
941 | ||
942 | out_release: | |
943 | drm_minor_release(minor); | |
944 | out_unlock: | |
945 | mutex_unlock(&drm_global_mutex); | |
946 | return err; | |
947 | } | |
948 | ||
949 | static const struct file_operations drm_stub_fops = { | |
950 | .owner = THIS_MODULE, | |
951 | .open = drm_stub_open, | |
952 | .llseek = noop_llseek, | |
953 | }; | |
954 | ||
2cc107dc DH |
955 | static void drm_core_exit(void) |
956 | { | |
957 | unregister_chrdev(DRM_MAJOR, "drm"); | |
958 | debugfs_remove(drm_debugfs_root); | |
959 | drm_sysfs_destroy(); | |
960 | idr_destroy(&drm_minors_idr); | |
961 | drm_connector_ida_destroy(); | |
2cc107dc DH |
962 | } |
963 | ||
1b7199fe DH |
964 | static int __init drm_core_init(void) |
965 | { | |
2cc107dc | 966 | int ret; |
1b7199fe | 967 | |
1b7199fe DH |
968 | drm_connector_ida_init(); |
969 | idr_init(&drm_minors_idr); | |
970 | ||
fcc90213 DH |
971 | ret = drm_sysfs_init(); |
972 | if (ret < 0) { | |
2cc107dc DH |
973 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
974 | goto error; | |
1b7199fe DH |
975 | } |
976 | ||
977 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
978 | if (!drm_debugfs_root) { | |
2cc107dc DH |
979 | ret = -ENOMEM; |
980 | DRM_ERROR("Cannot create debugfs-root: %d\n", ret); | |
981 | goto error; | |
1b7199fe DH |
982 | } |
983 | ||
2cc107dc DH |
984 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
985 | if (ret < 0) | |
986 | goto error; | |
987 | ||
371c2279 AM |
988 | drm_core_init_complete = true; |
989 | ||
e82dfa00 | 990 | DRM_DEBUG("Initialized\n"); |
1b7199fe | 991 | return 0; |
1b7199fe | 992 | |
2cc107dc DH |
993 | error: |
994 | drm_core_exit(); | |
1b7199fe DH |
995 | return ret; |
996 | } | |
997 | ||
1b7199fe DH |
998 | module_init(drm_core_init); |
999 | module_exit(drm_core_exit); |