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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> |
4a457910 | 34 | #include <linux/pseudo_fs.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
bee330f3 | 36 | #include <linux/srcu.h> |
85e634bc | 37 | |
c76f0f7c | 38 | #include <drm/drm_client.h> |
0500c04e | 39 | #include <drm/drm_color_mgmt.h> |
85e634bc | 40 | #include <drm/drm_drv.h> |
0500c04e | 41 | #include <drm/drm_file.h> |
6f365e56 | 42 | #include <drm/drm_managed.h> |
0500c04e SR |
43 | #include <drm/drm_mode_object.h> |
44 | #include <drm/drm_print.h> | |
85e634bc | 45 | |
79190ea2 | 46 | #include "drm_crtc_internal.h" |
67d0ec4e | 47 | #include "drm_internal.h" |
0500c04e | 48 | #include "drm_legacy.h" |
1da177e4 | 49 | |
82d5e73f DH |
50 | MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
51 | MODULE_DESCRIPTION("DRM shared core routines"); | |
1da177e4 | 52 | MODULE_LICENSE("GPL and additional rights"); |
1da177e4 | 53 | |
0d639883 | 54 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 55 | static struct idr drm_minors_idr; |
2c14f28b | 56 | |
371c2279 AM |
57 | /* |
58 | * If the drm core fails to init for whatever reason, | |
59 | * we should prevent any drivers from registering with it. | |
60 | * It's best to check this at drm_dev_init(), as some drivers | |
61 | * prefer to embed struct drm_device into their own device | |
62 | * structure and call drm_dev_init() themselves. | |
63 | */ | |
64 | static bool drm_core_init_complete = false; | |
65 | ||
1b7199fe | 66 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 67 | |
bee330f3 NT |
68 | DEFINE_STATIC_SRCU(drm_unplug_srcu); |
69 | ||
0d639883 DH |
70 | /* |
71 | * DRM Minors | |
72 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
73 | * of them is represented by a drm_minor object. Depending on the capabilities | |
74 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 75 | * |
0d639883 DH |
76 | * Minors can be accessed via dev->$minor_name. This pointer is either |
77 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
78 | * valid. This means, DRM minors have the same life-time as the underlying | |
79 | * device. However, this doesn't mean that the minor is active. Minors are | |
80 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 81 | */ |
0d639883 | 82 | |
05b701f6 DH |
83 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
84 | unsigned int type) | |
85 | { | |
86 | switch (type) { | |
a3ccc461 | 87 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
88 | return &dev->primary; |
89 | case DRM_MINOR_RENDER: | |
90 | return &dev->render; | |
05b701f6 | 91 | default: |
3bd07ccd | 92 | BUG(); |
05b701f6 DH |
93 | } |
94 | } | |
95 | ||
f96306f9 DV |
96 | static void drm_minor_alloc_release(struct drm_device *dev, void *data) |
97 | { | |
98 | struct drm_minor *minor = data; | |
99 | unsigned long flags; | |
100 | ||
101 | put_device(minor->kdev); | |
102 | ||
103 | spin_lock_irqsave(&drm_minor_lock, flags); | |
104 | idr_remove(&drm_minors_idr, minor->index); | |
105 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
106 | } | |
107 | ||
05b701f6 DH |
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 | 113 | |
f96306f9 | 114 | minor = drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL); |
05b701f6 DH |
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) | |
f96306f9 | 132 | return r; |
f1b85962 DH |
133 | |
134 | minor->index = r; | |
135 | ||
f96306f9 DV |
136 | r = drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor); |
137 | if (r) | |
138 | return r; | |
139 | ||
e1728075 | 140 | minor->kdev = drm_sysfs_minor_alloc(minor); |
f96306f9 DV |
141 | if (IS_ERR(minor->kdev)) |
142 | return PTR_ERR(minor->kdev); | |
e1728075 | 143 | |
05b701f6 DH |
144 | *drm_minor_get_slot(dev, type) = minor; |
145 | return 0; | |
bd9dfa98 DH |
146 | } |
147 | ||
afcdbc86 | 148 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 149 | { |
f1b85962 | 150 | struct drm_minor *minor; |
0d639883 | 151 | unsigned long flags; |
1da177e4 | 152 | int ret; |
1da177e4 LT |
153 | |
154 | DRM_DEBUG("\n"); | |
155 | ||
f1b85962 DH |
156 | minor = *drm_minor_get_slot(dev, type); |
157 | if (!minor) | |
05b701f6 DH |
158 | return 0; |
159 | ||
f1b85962 | 160 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 161 | if (ret) { |
156f5a78 | 162 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
a67834f8 | 163 | goto err_debugfs; |
955b12de | 164 | } |
2c14f28b | 165 | |
e1728075 DH |
166 | ret = device_add(minor->kdev); |
167 | if (ret) | |
cb6458f9 | 168 | goto err_debugfs; |
2c14f28b | 169 | |
0d639883 DH |
170 | /* replace NULL with @minor so lookups will succeed from now on */ |
171 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 172 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 173 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 174 | |
f1b85962 | 175 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
176 | return 0; |
177 | ||
cb6458f9 | 178 | err_debugfs: |
f1b85962 | 179 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
180 | return ret; |
181 | } | |
b5e89ed5 | 182 | |
afcdbc86 | 183 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 184 | { |
afcdbc86 | 185 | struct drm_minor *minor; |
0d639883 | 186 | unsigned long flags; |
afcdbc86 DH |
187 | |
188 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 189 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
190 | return; |
191 | ||
f1b85962 | 192 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 193 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 194 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 195 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 196 | |
e1728075 DH |
197 | device_del(minor->kdev); |
198 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 199 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
200 | } |
201 | ||
85e634bc | 202 | /* |
1616c525 DH |
203 | * Looks up the given minor-ID and returns the respective DRM-minor object. The |
204 | * refence-count of the underlying device is increased so you must release this | |
205 | * object with drm_minor_release(). | |
206 | * | |
207 | * As long as you hold this minor, it is guaranteed that the object and the | |
208 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
209 | * unregistered while you hold the minor. | |
1da177e4 | 210 | */ |
1616c525 | 211 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 212 | { |
1616c525 | 213 | struct drm_minor *minor; |
0d639883 | 214 | unsigned long flags; |
1616c525 | 215 | |
0d639883 | 216 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 217 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 | 218 | if (minor) |
9a96f550 | 219 | drm_dev_get(minor->dev); |
0d639883 DH |
220 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
221 | ||
222 | if (!minor) { | |
223 | return ERR_PTR(-ENODEV); | |
c07dcd61 | 224 | } else if (drm_dev_is_unplugged(minor->dev)) { |
9a96f550 | 225 | drm_dev_put(minor->dev); |
1616c525 | 226 | return ERR_PTR(-ENODEV); |
0d639883 | 227 | } |
673a394b | 228 | |
1616c525 DH |
229 | return minor; |
230 | } | |
b5e89ed5 | 231 | |
1616c525 DH |
232 | void drm_minor_release(struct drm_minor *minor) |
233 | { | |
9a96f550 | 234 | drm_dev_put(minor->dev); |
1da177e4 | 235 | } |
112b715e | 236 | |
6e3f797c DV |
237 | /** |
238 | * DOC: driver instance overview | |
239 | * | |
ea0dd85a | 240 | * A device instance for a drm driver is represented by &struct drm_device. This |
33e70110 | 241 | * is initialized with drm_dev_init(), usually from bus-specific ->probe() |
6e3f797c DV |
242 | * callbacks implemented by the driver. The driver then needs to initialize all |
243 | * the various subsystems for the drm device like memory management, vblank | |
244 | * handling, modesetting support and intial output configuration plus obviously | |
33e70110 DV |
245 | * initialize all the corresponding hardware bits. Finally when everything is up |
246 | * and running and ready for userspace the device instance can be published | |
247 | * using drm_dev_register(). | |
6e3f797c DV |
248 | * |
249 | * There is also deprecated support for initalizing device instances using | |
ef40cbf9 | 250 | * bus-specific helpers and the &drm_driver.load callback. But due to |
6e3f797c DV |
251 | * backwards-compatibility needs the device instance have to be published too |
252 | * early, which requires unpretty global locking to make safe and is therefore | |
253 | * only support for existing drivers not yet converted to the new scheme. | |
254 | * | |
255 | * When cleaning up a device instance everything needs to be done in reverse: | |
256 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
257 | * any other resources allocated at device initialization and drop the driver's | |
9a96f550 | 258 | * reference to &drm_device using drm_dev_put(). |
6e3f797c DV |
259 | * |
260 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
261 | * historical baggage. Hence use the reference counting provided by | |
9a96f550 | 262 | * drm_dev_get() and drm_dev_put() only carefully. |
de99f060 NT |
263 | * |
264 | * Display driver example | |
265 | * ~~~~~~~~~~~~~~~~~~~~~~ | |
266 | * | |
267 | * The following example shows a typical structure of a DRM display driver. | |
268 | * The example focus on the probe() function and the other functions that is | |
269 | * almost always present and serves as a demonstration of devm_drm_dev_init() | |
270 | * usage with its accompanying drm_driver->release callback. | |
271 | * | |
272 | * .. code-block:: c | |
273 | * | |
274 | * struct driver_device { | |
275 | * struct drm_device drm; | |
276 | * void *userspace_facing; | |
277 | * struct clk *pclk; | |
278 | * }; | |
279 | * | |
280 | * static void driver_drm_release(struct drm_device *drm) | |
281 | * { | |
282 | * struct driver_device *priv = container_of(...); | |
283 | * | |
284 | * drm_mode_config_cleanup(drm); | |
285 | * drm_dev_fini(drm); | |
de99f060 NT |
286 | * } |
287 | * | |
288 | * static struct drm_driver driver_drm_driver = { | |
289 | * [...] | |
290 | * .release = driver_drm_release, | |
291 | * }; | |
292 | * | |
293 | * static int driver_probe(struct platform_device *pdev) | |
294 | * { | |
295 | * struct driver_device *priv; | |
296 | * struct drm_device *drm; | |
297 | * int ret; | |
298 | * | |
56d8d641 JN |
299 | * // devm_kzalloc() can't be used here because the drm_device ' |
300 | * // lifetime can exceed the device lifetime if driver unbind | |
301 | * // happens when userspace still has open file descriptors. | |
de99f060 NT |
302 | * priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
303 | * if (!priv) | |
304 | * return -ENOMEM; | |
305 | * | |
306 | * drm = &priv->drm; | |
307 | * | |
308 | * ret = devm_drm_dev_init(&pdev->dev, drm, &driver_drm_driver); | |
309 | * if (ret) { | |
310 | * kfree(drm); | |
311 | * return ret; | |
312 | * } | |
5dad34f3 | 313 | * drmm_add_final_kfree(drm, priv); |
de99f060 NT |
314 | * |
315 | * drm_mode_config_init(drm); | |
316 | * | |
5dad34f3 | 317 | * priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL); |
de99f060 NT |
318 | * if (!priv->userspace_facing) |
319 | * return -ENOMEM; | |
320 | * | |
321 | * priv->pclk = devm_clk_get(dev, "PCLK"); | |
322 | * if (IS_ERR(priv->pclk)) | |
323 | * return PTR_ERR(priv->pclk); | |
324 | * | |
56d8d641 | 325 | * // Further setup, display pipeline etc |
de99f060 NT |
326 | * |
327 | * platform_set_drvdata(pdev, drm); | |
328 | * | |
329 | * drm_mode_config_reset(drm); | |
330 | * | |
331 | * ret = drm_dev_register(drm); | |
332 | * if (ret) | |
333 | * return ret; | |
334 | * | |
335 | * drm_fbdev_generic_setup(drm, 32); | |
336 | * | |
337 | * return 0; | |
338 | * } | |
339 | * | |
56d8d641 | 340 | * // This function is called before the devm_ resources are released |
de99f060 NT |
341 | * static int driver_remove(struct platform_device *pdev) |
342 | * { | |
343 | * struct drm_device *drm = platform_get_drvdata(pdev); | |
344 | * | |
345 | * drm_dev_unregister(drm); | |
346 | * drm_atomic_helper_shutdown(drm) | |
347 | * | |
348 | * return 0; | |
349 | * } | |
350 | * | |
56d8d641 | 351 | * // This function is called on kernel restart and shutdown |
de99f060 NT |
352 | * static void driver_shutdown(struct platform_device *pdev) |
353 | * { | |
354 | * drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); | |
355 | * } | |
356 | * | |
357 | * static int __maybe_unused driver_pm_suspend(struct device *dev) | |
358 | * { | |
359 | * return drm_mode_config_helper_suspend(dev_get_drvdata(dev)); | |
360 | * } | |
361 | * | |
362 | * static int __maybe_unused driver_pm_resume(struct device *dev) | |
363 | * { | |
364 | * drm_mode_config_helper_resume(dev_get_drvdata(dev)); | |
365 | * | |
366 | * return 0; | |
367 | * } | |
368 | * | |
369 | * static const struct dev_pm_ops driver_pm_ops = { | |
370 | * SET_SYSTEM_SLEEP_PM_OPS(driver_pm_suspend, driver_pm_resume) | |
371 | * }; | |
372 | * | |
373 | * static struct platform_driver driver_driver = { | |
374 | * .driver = { | |
375 | * [...] | |
376 | * .pm = &driver_pm_ops, | |
377 | * }, | |
378 | * .probe = driver_probe, | |
379 | * .remove = driver_remove, | |
380 | * .shutdown = driver_shutdown, | |
381 | * }; | |
382 | * module_platform_driver(driver_driver); | |
383 | * | |
384 | * Drivers that want to support device unplugging (USB, DT overlay unload) should | |
385 | * use drm_dev_unplug() instead of drm_dev_unregister(). The driver must protect | |
386 | * regions that is accessing device resources to prevent use after they're | |
387 | * released. This is done using drm_dev_enter() and drm_dev_exit(). There is one | |
388 | * shortcoming however, drm_dev_unplug() marks the drm_device as unplugged before | |
389 | * drm_atomic_helper_shutdown() is called. This means that if the disable code | |
390 | * paths are protected, they will not run on regular driver module unload, | |
391 | * possibily leaving the hardware enabled. | |
6e3f797c DV |
392 | */ |
393 | ||
112b715e | 394 | /** |
c6a1af8a TR |
395 | * drm_put_dev - Unregister and release a DRM device |
396 | * @dev: DRM device | |
112b715e | 397 | * |
c6a1af8a | 398 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 399 | * |
c6a1af8a | 400 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
401 | * |
402 | * Note: Use of this function is deprecated. It will eventually go away | |
9a96f550 | 403 | * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly |
6e3f797c DV |
404 | * instead to make sure that the device isn't userspace accessible any more |
405 | * while teardown is in progress, ensuring that userspace can't access an | |
406 | * inconsistent state. | |
112b715e KH |
407 | */ |
408 | void drm_put_dev(struct drm_device *dev) | |
409 | { | |
112b715e KH |
410 | DRM_DEBUG("\n"); |
411 | ||
412 | if (!dev) { | |
413 | DRM_ERROR("cleanup called no dev\n"); | |
414 | return; | |
415 | } | |
416 | ||
c3a49737 | 417 | drm_dev_unregister(dev); |
9a96f550 | 418 | drm_dev_put(dev); |
112b715e KH |
419 | } |
420 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d | 421 | |
bee330f3 NT |
422 | /** |
423 | * drm_dev_enter - Enter device critical section | |
424 | * @dev: DRM device | |
425 | * @idx: Pointer to index that will be passed to the matching drm_dev_exit() | |
426 | * | |
427 | * This function marks and protects the beginning of a section that should not | |
428 | * be entered after the device has been unplugged. The section end is marked | |
429 | * with drm_dev_exit(). Calls to this function can be nested. | |
430 | * | |
431 | * Returns: | |
432 | * True if it is OK to enter the section, false otherwise. | |
433 | */ | |
434 | bool drm_dev_enter(struct drm_device *dev, int *idx) | |
c07dcd61 | 435 | { |
bee330f3 NT |
436 | *idx = srcu_read_lock(&drm_unplug_srcu); |
437 | ||
438 | if (dev->unplugged) { | |
439 | srcu_read_unlock(&drm_unplug_srcu, *idx); | |
440 | return false; | |
441 | } | |
442 | ||
443 | return true; | |
c07dcd61 | 444 | } |
bee330f3 NT |
445 | EXPORT_SYMBOL(drm_dev_enter); |
446 | ||
447 | /** | |
448 | * drm_dev_exit - Exit device critical section | |
449 | * @idx: index returned from drm_dev_enter() | |
450 | * | |
451 | * This function marks the end of a section that should not be entered after | |
452 | * the device has been unplugged. | |
453 | */ | |
454 | void drm_dev_exit(int idx) | |
c07dcd61 | 455 | { |
bee330f3 | 456 | srcu_read_unlock(&drm_unplug_srcu, idx); |
c07dcd61 | 457 | } |
bee330f3 | 458 | EXPORT_SYMBOL(drm_dev_exit); |
c07dcd61 DV |
459 | |
460 | /** | |
461 | * drm_dev_unplug - unplug a DRM device | |
462 | * @dev: DRM device | |
463 | * | |
464 | * This unplugs a hotpluggable DRM device, which makes it inaccessible to | |
bee330f3 NT |
465 | * userspace operations. Entry-points can use drm_dev_enter() and |
466 | * drm_dev_exit() to protect device resources in a race free manner. This | |
c07dcd61 DV |
467 | * essentially unregisters the device like drm_dev_unregister(), but can be |
468 | * called while there are still open users of @dev. | |
469 | */ | |
470 | void drm_dev_unplug(struct drm_device *dev) | |
2c07a21d | 471 | { |
bee330f3 NT |
472 | /* |
473 | * After synchronizing any critical read section is guaranteed to see | |
474 | * the new value of ->unplugged, and any critical section which might | |
475 | * still have seen the old value of ->unplugged is guaranteed to have | |
476 | * finished. | |
477 | */ | |
478 | dev->unplugged = true; | |
479 | synchronize_srcu(&drm_unplug_srcu); | |
069035c5 OA |
480 | |
481 | drm_dev_unregister(dev); | |
2c07a21d | 482 | } |
c07dcd61 | 483 | EXPORT_SYMBOL(drm_dev_unplug); |
1bb72532 | 484 | |
31bbe16f DH |
485 | /* |
486 | * DRM internal mount | |
487 | * We want to be able to allocate our own "struct address_space" to control | |
488 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
489 | * stand-alone address_space objects, so we need an underlying inode. As there | |
490 | * is no way to allocate an independent inode easily, we need a fake internal | |
491 | * VFS mount-point. | |
492 | * | |
493 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
494 | * frees it again. You are allowed to use iget() and iput() to get references to | |
495 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
496 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
497 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
498 | * between multiple inode-users. You could, technically, call | |
499 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
500 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
501 | */ | |
502 | ||
503 | static int drm_fs_cnt; | |
504 | static struct vfsmount *drm_fs_mnt; | |
505 | ||
4a457910 | 506 | static int drm_fs_init_fs_context(struct fs_context *fc) |
31bbe16f | 507 | { |
4a457910 | 508 | return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM; |
31bbe16f DH |
509 | } |
510 | ||
511 | static struct file_system_type drm_fs_type = { | |
512 | .name = "drm", | |
513 | .owner = THIS_MODULE, | |
4a457910 | 514 | .init_fs_context = drm_fs_init_fs_context, |
31bbe16f DH |
515 | .kill_sb = kill_anon_super, |
516 | }; | |
517 | ||
518 | static struct inode *drm_fs_inode_new(void) | |
519 | { | |
520 | struct inode *inode; | |
521 | int r; | |
522 | ||
523 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
524 | if (r < 0) { | |
525 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
526 | return ERR_PTR(r); | |
527 | } | |
528 | ||
529 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
530 | if (IS_ERR(inode)) | |
531 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
532 | ||
533 | return inode; | |
534 | } | |
535 | ||
536 | static void drm_fs_inode_free(struct inode *inode) | |
537 | { | |
538 | if (inode) { | |
539 | iput(inode); | |
540 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
541 | } | |
542 | } | |
543 | ||
86ab67df DV |
544 | /** |
545 | * DOC: component helper usage recommendations | |
546 | * | |
547 | * DRM drivers that drive hardware where a logical device consists of a pile of | |
548 | * independent hardware blocks are recommended to use the :ref:`component helper | |
549 | * library<component>`. For consistency and better options for code reuse the | |
550 | * following guidelines apply: | |
551 | * | |
552 | * - The entire device initialization procedure should be run from the | |
553 | * &component_master_ops.master_bind callback, starting with drm_dev_init(), | |
554 | * then binding all components with component_bind_all() and finishing with | |
555 | * drm_dev_register(). | |
556 | * | |
557 | * - The opaque pointer passed to all components through component_bind_all() | |
558 | * should point at &struct drm_device of the device instance, not some driver | |
559 | * specific private structure. | |
560 | * | |
561 | * - The component helper fills the niche where further standardization of | |
562 | * interfaces is not practical. When there already is, or will be, a | |
563 | * standardized interface like &drm_bridge or &drm_panel, providing its own | |
564 | * functions to find such components at driver load time, like | |
565 | * drm_of_find_panel_or_bridge(), then the component helper should not be | |
566 | * used. | |
567 | */ | |
568 | ||
2cbf7fc6 DV |
569 | static void drm_dev_init_release(struct drm_device *dev, void *res) |
570 | { | |
571 | drm_legacy_ctxbitmap_cleanup(dev); | |
572 | drm_legacy_remove_map_hash(dev); | |
573 | drm_fs_inode_free(dev->anon_inode); | |
574 | ||
575 | put_device(dev->dev); | |
576 | /* Prevent use-after-free in drm_managed_release when debugging is | |
577 | * enabled. Slightly awkward, but can't really be helped. */ | |
578 | dev->dev = NULL; | |
579 | mutex_destroy(&dev->master_mutex); | |
580 | mutex_destroy(&dev->clientlist_mutex); | |
581 | mutex_destroy(&dev->filelist_mutex); | |
582 | mutex_destroy(&dev->struct_mutex); | |
583 | drm_legacy_destroy_members(dev); | |
584 | } | |
585 | ||
1bb72532 | 586 | /** |
b209aca3 CW |
587 | * drm_dev_init - Initialise new DRM device |
588 | * @dev: DRM device | |
589 | * @driver: DRM driver | |
1bb72532 DH |
590 | * @parent: Parent device object |
591 | * | |
b209aca3 | 592 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 593 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
594 | * with other core subsystems. This should be done last in the device |
595 | * initialization sequence to make sure userspace can't access an inconsistent | |
596 | * state. | |
1bb72532 | 597 | * |
9a96f550 AP |
598 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
599 | * drm_dev_put() to take and drop further ref-counts. | |
099d1c29 | 600 | * |
33e70110 DV |
601 | * It is recommended that drivers embed &struct drm_device into their own device |
602 | * structure. | |
603 | * | |
b209aca3 | 604 | * Drivers that do not want to allocate their own device struct |
ea0dd85a DV |
605 | * embedding &struct drm_device can call drm_dev_alloc() instead. For drivers |
606 | * that do embed &struct drm_device it must be placed first in the overall | |
d82faafd DV |
607 | * structure, and the overall structure must be allocated using kmalloc(): The |
608 | * drm core's release function unconditionally calls kfree() on the @dev pointer | |
f30c9257 CW |
609 | * when the final reference is released. To override this behaviour, and so |
610 | * allow embedding of the drm_device inside the driver's device struct at an | |
611 | * arbitrary offset, you must supply a &drm_driver.release callback and control | |
612 | * the finalization explicitly. | |
b209aca3 | 613 | * |
1bb72532 | 614 | * RETURNS: |
b209aca3 | 615 | * 0 on success, or error code on failure. |
1bb72532 | 616 | */ |
b209aca3 CW |
617 | int drm_dev_init(struct drm_device *dev, |
618 | struct drm_driver *driver, | |
619 | struct device *parent) | |
1bb72532 | 620 | { |
1bb72532 DH |
621 | int ret; |
622 | ||
371c2279 AM |
623 | if (!drm_core_init_complete) { |
624 | DRM_ERROR("DRM core is not initialized\n"); | |
625 | return -ENODEV; | |
626 | } | |
627 | ||
8b6fc114 AP |
628 | if (WARN_ON(!parent)) |
629 | return -EINVAL; | |
f08877e7 | 630 | |
099d1c29 | 631 | kref_init(&dev->ref); |
56be6503 | 632 | dev->dev = get_device(parent); |
1bb72532 DH |
633 | dev->driver = driver; |
634 | ||
c6603c74 DV |
635 | INIT_LIST_HEAD(&dev->managed.resources); |
636 | spin_lock_init(&dev->managed.lock); | |
637 | ||
18ace11f VS |
638 | /* no per-device feature limits by default */ |
639 | dev->driver_features = ~0u; | |
640 | ||
8437dd73 | 641 | drm_legacy_init_members(dev); |
1bb72532 | 642 | INIT_LIST_HEAD(&dev->filelist); |
c76f0f7c NT |
643 | INIT_LIST_HEAD(&dev->filelist_internal); |
644 | INIT_LIST_HEAD(&dev->clientlist); | |
1bb72532 DH |
645 | INIT_LIST_HEAD(&dev->vblank_event_list); |
646 | ||
1bb72532 DH |
647 | spin_lock_init(&dev->event_lock); |
648 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 649 | mutex_init(&dev->filelist_mutex); |
c76f0f7c | 650 | mutex_init(&dev->clientlist_mutex); |
c996fd0b | 651 | mutex_init(&dev->master_mutex); |
1bb72532 | 652 | |
2cbf7fc6 DV |
653 | ret = drmm_add_action(dev, drm_dev_init_release, NULL); |
654 | if (ret) | |
655 | return ret; | |
656 | ||
6796cb16 DH |
657 | dev->anon_inode = drm_fs_inode_new(); |
658 | if (IS_ERR(dev->anon_inode)) { | |
659 | ret = PTR_ERR(dev->anon_inode); | |
660 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
2cbf7fc6 | 661 | goto err; |
6796cb16 DH |
662 | } |
663 | ||
6d6dfcfb | 664 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
665 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
666 | if (ret) | |
f96306f9 | 667 | goto err; |
05b701f6 DH |
668 | } |
669 | ||
a3ccc461 | 670 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 | 671 | if (ret) |
f96306f9 | 672 | goto err; |
05b701f6 | 673 | |
fabb0e2a | 674 | ret = drm_legacy_create_map_hash(dev); |
b209aca3 | 675 | if (ret) |
f96306f9 | 676 | goto err; |
1bb72532 | 677 | |
ba6976c1 | 678 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 679 | |
1bcecfac | 680 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
681 | ret = drm_gem_init(dev); |
682 | if (ret) { | |
683 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
f96306f9 | 684 | goto err; |
1bb72532 DH |
685 | } |
686 | } | |
687 | ||
f08877e7 | 688 | ret = drm_dev_set_unique(dev, dev_name(parent)); |
5079c464 DV |
689 | if (ret) |
690 | goto err_setunique; | |
e112e593 | 691 | |
b209aca3 | 692 | return 0; |
1bb72532 | 693 | |
e112e593 NI |
694 | err_setunique: |
695 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
696 | drm_gem_destroy(dev); | |
2cbf7fc6 DV |
697 | err: |
698 | drm_managed_release(dev); | |
699 | ||
b209aca3 CW |
700 | return ret; |
701 | } | |
702 | EXPORT_SYMBOL(drm_dev_init); | |
703 | ||
9b1f1b6b NT |
704 | static void devm_drm_dev_init_release(void *data) |
705 | { | |
706 | drm_dev_put(data); | |
707 | } | |
708 | ||
709 | /** | |
710 | * devm_drm_dev_init - Resource managed drm_dev_init() | |
711 | * @parent: Parent device object | |
712 | * @dev: DRM device | |
713 | * @driver: DRM driver | |
714 | * | |
715 | * Managed drm_dev_init(). The DRM device initialized with this function is | |
716 | * automatically put on driver detach using drm_dev_put(). You must supply a | |
717 | * &drm_driver.release callback to control the finalization explicitly. | |
718 | * | |
719 | * RETURNS: | |
720 | * 0 on success, or error code on failure. | |
721 | */ | |
722 | int devm_drm_dev_init(struct device *parent, | |
723 | struct drm_device *dev, | |
724 | struct drm_driver *driver) | |
725 | { | |
726 | int ret; | |
727 | ||
8b6fc114 | 728 | if (WARN_ON(!driver->release)) |
9b1f1b6b NT |
729 | return -EINVAL; |
730 | ||
731 | ret = drm_dev_init(dev, driver, parent); | |
732 | if (ret) | |
733 | return ret; | |
734 | ||
735 | ret = devm_add_action(parent, devm_drm_dev_init_release, dev); | |
736 | if (ret) | |
737 | devm_drm_dev_init_release(dev); | |
738 | ||
739 | return ret; | |
740 | } | |
741 | EXPORT_SYMBOL(devm_drm_dev_init); | |
742 | ||
f30c9257 CW |
743 | /** |
744 | * drm_dev_fini - Finalize a dead DRM device | |
745 | * @dev: DRM device | |
746 | * | |
747 | * Finalize a dead DRM device. This is the converse to drm_dev_init() and | |
748 | * frees up all data allocated by it. All driver private data should be | |
749 | * finalized first. Note that this function does not free the @dev, that is | |
750 | * left to the caller. | |
751 | * | |
752 | * The ref-count of @dev must be zero, and drm_dev_fini() should only be called | |
753 | * from a &drm_driver.release callback. | |
754 | */ | |
755 | void drm_dev_fini(struct drm_device *dev) | |
756 | { | |
757 | drm_vblank_cleanup(dev); | |
758 | ||
759 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
760 | drm_gem_destroy(dev); | |
f30c9257 CW |
761 | } |
762 | EXPORT_SYMBOL(drm_dev_fini); | |
763 | ||
b209aca3 CW |
764 | /** |
765 | * drm_dev_alloc - Allocate new DRM device | |
766 | * @driver: DRM driver to allocate device for | |
767 | * @parent: Parent device object | |
768 | * | |
769 | * Allocate and initialize a new DRM device. No device registration is done. | |
770 | * Call drm_dev_register() to advertice the device to user space and register it | |
771 | * with other core subsystems. This should be done last in the device | |
772 | * initialization sequence to make sure userspace can't access an inconsistent | |
773 | * state. | |
774 | * | |
9a96f550 AP |
775 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
776 | * drm_dev_put() to take and drop further ref-counts. | |
b209aca3 CW |
777 | * |
778 | * Note that for purely virtual devices @parent can be NULL. | |
779 | * | |
ea0dd85a | 780 | * Drivers that wish to subclass or embed &struct drm_device into their |
b209aca3 CW |
781 | * own struct should look at using drm_dev_init() instead. |
782 | * | |
783 | * RETURNS: | |
0f288605 | 784 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 CW |
785 | */ |
786 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
787 | struct device *parent) | |
788 | { | |
789 | struct drm_device *dev; | |
790 | int ret; | |
791 | ||
792 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
793 | if (!dev) | |
0f288605 | 794 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
795 | |
796 | ret = drm_dev_init(dev, driver, parent); | |
797 | if (ret) { | |
798 | kfree(dev); | |
0f288605 | 799 | return ERR_PTR(ret); |
b209aca3 CW |
800 | } |
801 | ||
6f365e56 DV |
802 | drmm_add_final_kfree(dev, dev); |
803 | ||
b209aca3 | 804 | return dev; |
1bb72532 DH |
805 | } |
806 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 807 | |
099d1c29 | 808 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 809 | { |
099d1c29 | 810 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 811 | |
c6603c74 | 812 | if (dev->driver->release) |
f30c9257 | 813 | dev->driver->release(dev); |
c6603c74 | 814 | else |
f30c9257 | 815 | drm_dev_fini(dev); |
c6603c74 DV |
816 | |
817 | drm_managed_release(dev); | |
818 | ||
5dad34f3 | 819 | if (dev->managed.final_kfree) |
c6603c74 | 820 | kfree(dev->managed.final_kfree); |
0dc8fe59 | 821 | } |
099d1c29 DH |
822 | |
823 | /** | |
9a96f550 | 824 | * drm_dev_get - Take reference of a DRM device |
099d1c29 DH |
825 | * @dev: device to take reference of or NULL |
826 | * | |
827 | * This increases the ref-count of @dev by one. You *must* already own a | |
9a96f550 | 828 | * reference when calling this. Use drm_dev_put() to drop this reference |
099d1c29 DH |
829 | * again. |
830 | * | |
831 | * This function never fails. However, this function does not provide *any* | |
832 | * guarantee whether the device is alive or running. It only provides a | |
833 | * reference to the object and the memory associated with it. | |
834 | */ | |
9a96f550 | 835 | void drm_dev_get(struct drm_device *dev) |
099d1c29 DH |
836 | { |
837 | if (dev) | |
838 | kref_get(&dev->ref); | |
839 | } | |
9a96f550 | 840 | EXPORT_SYMBOL(drm_dev_get); |
099d1c29 DH |
841 | |
842 | /** | |
9a96f550 | 843 | * drm_dev_put - Drop reference of a DRM device |
099d1c29 DH |
844 | * @dev: device to drop reference of or NULL |
845 | * | |
846 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
847 | * ref-count drops to zero. | |
848 | */ | |
9a96f550 | 849 | void drm_dev_put(struct drm_device *dev) |
099d1c29 DH |
850 | { |
851 | if (dev) | |
852 | kref_put(&dev->ref, drm_dev_release); | |
853 | } | |
9a96f550 AP |
854 | EXPORT_SYMBOL(drm_dev_put); |
855 | ||
6449b088 DV |
856 | static int create_compat_control_link(struct drm_device *dev) |
857 | { | |
858 | struct drm_minor *minor; | |
859 | char *name; | |
860 | int ret; | |
861 | ||
862 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
863 | return 0; | |
864 | ||
865 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
866 | if (!minor) | |
867 | return 0; | |
868 | ||
869 | /* | |
870 | * Some existing userspace out there uses the existing of the controlD* | |
871 | * sysfs files to figure out whether it's a modeset driver. It only does | |
872 | * readdir, hence a symlink is sufficient (and the least confusing | |
873 | * option). Otherwise controlD* is entirely unused. | |
874 | * | |
875 | * Old controlD chardev have been allocated in the range | |
876 | * 64-127. | |
877 | */ | |
878 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); | |
879 | if (!name) | |
880 | return -ENOMEM; | |
881 | ||
882 | ret = sysfs_create_link(minor->kdev->kobj.parent, | |
883 | &minor->kdev->kobj, | |
884 | name); | |
885 | ||
886 | kfree(name); | |
887 | ||
888 | return ret; | |
889 | } | |
890 | ||
891 | static void remove_compat_control_link(struct drm_device *dev) | |
892 | { | |
893 | struct drm_minor *minor; | |
894 | char *name; | |
895 | ||
896 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
897 | return; | |
898 | ||
899 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
900 | if (!minor) | |
901 | return; | |
902 | ||
7f6df440 | 903 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
6449b088 DV |
904 | if (!name) |
905 | return; | |
906 | ||
907 | sysfs_remove_link(minor->kdev->kobj.parent, name); | |
908 | ||
909 | kfree(name); | |
910 | } | |
911 | ||
c22f0ace DH |
912 | /** |
913 | * drm_dev_register - Register DRM device | |
914 | * @dev: Device to register | |
c6a1af8a | 915 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
916 | * |
917 | * Register the DRM device @dev with the system, advertise device to user-space | |
33e70110 | 918 | * and start normal device operation. @dev must be initialized via drm_dev_init() |
e28cd4d0 | 919 | * previously. |
c22f0ace DH |
920 | * |
921 | * Never call this twice on any device! | |
922 | * | |
6e3f797c | 923 | * NOTE: To ensure backward compatibility with existing drivers method this |
ef40cbf9 DV |
924 | * function calls the &drm_driver.load method after registering the device |
925 | * nodes, creating race conditions. Usage of the &drm_driver.load methods is | |
926 | * therefore deprecated, drivers must perform all initialization before calling | |
6e3f797c DV |
927 | * drm_dev_register(). |
928 | * | |
c22f0ace DH |
929 | * RETURNS: |
930 | * 0 on success, negative error code on failure. | |
931 | */ | |
932 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
933 | { | |
75f6dfe3 | 934 | struct drm_driver *driver = dev->driver; |
c22f0ace DH |
935 | int ret; |
936 | ||
71427795 VS |
937 | if (!driver->load) |
938 | drm_mode_config_validate(dev); | |
939 | ||
5dad34f3 DV |
940 | WARN_ON(!dev->managed.final_kfree); |
941 | ||
4017ad7b DV |
942 | if (drm_dev_needs_global_mutex(dev)) |
943 | mutex_lock(&drm_global_mutex); | |
c22f0ace | 944 | |
afcdbc86 | 945 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
946 | if (ret) |
947 | goto err_minors; | |
c22f0ace | 948 | |
a3ccc461 | 949 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 950 | if (ret) |
05b701f6 | 951 | goto err_minors; |
c22f0ace | 952 | |
6449b088 DV |
953 | ret = create_compat_control_link(dev); |
954 | if (ret) | |
955 | goto err_minors; | |
956 | ||
e0f32f78 DV |
957 | dev->registered = true; |
958 | ||
c22f0ace DH |
959 | if (dev->driver->load) { |
960 | ret = dev->driver->load(dev, flags); | |
961 | if (ret) | |
05b701f6 | 962 | goto err_minors; |
c22f0ace DH |
963 | } |
964 | ||
bee7fb15 | 965 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 966 | drm_modeset_register_all(dev); |
e28cd4d0 | 967 | |
c22f0ace | 968 | ret = 0; |
75f6dfe3 GKB |
969 | |
970 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", | |
971 | driver->name, driver->major, driver->minor, | |
6098909c CW |
972 | driver->patchlevel, driver->date, |
973 | dev->dev ? dev_name(dev->dev) : "virtual device", | |
75f6dfe3 GKB |
974 | dev->primary->index); |
975 | ||
c22f0ace DH |
976 | goto out_unlock; |
977 | ||
05b701f6 | 978 | err_minors: |
6449b088 | 979 | remove_compat_control_link(dev); |
a3ccc461 | 980 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 981 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c22f0ace | 982 | out_unlock: |
4017ad7b DV |
983 | if (drm_dev_needs_global_mutex(dev)) |
984 | mutex_unlock(&drm_global_mutex); | |
c22f0ace DH |
985 | return ret; |
986 | } | |
987 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
988 | |
989 | /** | |
990 | * drm_dev_unregister - Unregister DRM device | |
991 | * @dev: Device to unregister | |
992 | * | |
993 | * Unregister the DRM device from the system. This does the reverse of | |
994 | * drm_dev_register() but does not deallocate the device. The caller must call | |
9a96f550 | 995 | * drm_dev_put() to drop their final reference. |
6e3f797c | 996 | * |
c07dcd61 DV |
997 | * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), |
998 | * which can be called while there are still open users of @dev. | |
999 | * | |
6e3f797c DV |
1000 | * This should be called first in the device teardown code to make sure |
1001 | * userspace can't access the device instance any more. | |
c3a49737 DH |
1002 | */ |
1003 | void drm_dev_unregister(struct drm_device *dev) | |
1004 | { | |
2e45eeac DV |
1005 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
1006 | drm_lastclose(dev); | |
c3a49737 | 1007 | |
e6e7b48b DV |
1008 | dev->registered = false; |
1009 | ||
c76f0f7c NT |
1010 | drm_client_dev_unregister(dev); |
1011 | ||
bee7fb15 | 1012 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 1013 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 1014 | |
c3a49737 DH |
1015 | if (dev->driver->unload) |
1016 | dev->driver->unload(dev); | |
1017 | ||
4efafebe DV |
1018 | if (dev->agp) |
1019 | drm_pci_agp_destroy(dev); | |
c3a49737 | 1020 | |
35a28021 | 1021 | drm_legacy_rmmaps(dev); |
c3a49737 | 1022 | |
6449b088 | 1023 | remove_compat_control_link(dev); |
a3ccc461 | 1024 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 1025 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c3a49737 DH |
1026 | } |
1027 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 1028 | |
a6b5fac5 GH |
1029 | /** |
1030 | * drm_dev_set_unique - Set the unique name of a DRM device | |
1031 | * @dev: device of which to set the unique name | |
1032 | * @name: unique name | |
1033 | * | |
33e70110 DV |
1034 | * Sets the unique name of a DRM device using the specified string. This is |
1035 | * already done by drm_dev_init(), drivers should only override the default | |
1036 | * unique name for backwards compatibility reasons. | |
a6b5fac5 GH |
1037 | * |
1038 | * Return: 0 on success or a negative error code on failure. | |
1039 | */ | |
1040 | int drm_dev_set_unique(struct drm_device *dev, const char *name) | |
1041 | { | |
a5c71fdb DV |
1042 | drmm_kfree(dev, dev->unique); |
1043 | dev->unique = drmm_kstrdup(dev, name, GFP_KERNEL); | |
a6b5fac5 GH |
1044 | |
1045 | return dev->unique ? 0 : -ENOMEM; | |
1046 | } | |
1047 | EXPORT_SYMBOL(drm_dev_set_unique); | |
1048 | ||
1b7199fe DH |
1049 | /* |
1050 | * DRM Core | |
1051 | * The DRM core module initializes all global DRM objects and makes them | |
1052 | * available to drivers. Once setup, drivers can probe their respective | |
1053 | * devices. | |
1054 | * Currently, core management includes: | |
1055 | * - The "DRM-Global" key/value database | |
1056 | * - Global ID management for connectors | |
1057 | * - DRM major number allocation | |
1058 | * - DRM minor management | |
1059 | * - DRM sysfs class | |
1060 | * - DRM debugfs root | |
1061 | * | |
1062 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
1063 | * interface registered on a DRM device, you can request minor numbers from DRM | |
1064 | * core. DRM core takes care of major-number management and char-dev | |
1065 | * registration. A stub ->open() callback forwards any open() requests to the | |
1066 | * registered minor. | |
1067 | */ | |
1068 | ||
1069 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
1070 | { | |
1071 | const struct file_operations *new_fops; | |
1072 | struct drm_minor *minor; | |
1073 | int err; | |
1074 | ||
1075 | DRM_DEBUG("\n"); | |
1076 | ||
1b7199fe | 1077 | minor = drm_minor_acquire(iminor(inode)); |
591a2abf DV |
1078 | if (IS_ERR(minor)) |
1079 | return PTR_ERR(minor); | |
1b7199fe DH |
1080 | |
1081 | new_fops = fops_get(minor->dev->driver->fops); | |
1082 | if (!new_fops) { | |
1083 | err = -ENODEV; | |
591a2abf | 1084 | goto out; |
1b7199fe DH |
1085 | } |
1086 | ||
1087 | replace_fops(filp, new_fops); | |
1088 | if (filp->f_op->open) | |
1089 | err = filp->f_op->open(inode, filp); | |
1090 | else | |
1091 | err = 0; | |
1092 | ||
591a2abf | 1093 | out: |
1b7199fe | 1094 | drm_minor_release(minor); |
591a2abf | 1095 | |
1b7199fe DH |
1096 | return err; |
1097 | } | |
1098 | ||
1099 | static const struct file_operations drm_stub_fops = { | |
1100 | .owner = THIS_MODULE, | |
1101 | .open = drm_stub_open, | |
1102 | .llseek = noop_llseek, | |
1103 | }; | |
1104 | ||
2cc107dc DH |
1105 | static void drm_core_exit(void) |
1106 | { | |
1107 | unregister_chrdev(DRM_MAJOR, "drm"); | |
1108 | debugfs_remove(drm_debugfs_root); | |
1109 | drm_sysfs_destroy(); | |
1110 | idr_destroy(&drm_minors_idr); | |
1111 | drm_connector_ida_destroy(); | |
2cc107dc DH |
1112 | } |
1113 | ||
1b7199fe DH |
1114 | static int __init drm_core_init(void) |
1115 | { | |
2cc107dc | 1116 | int ret; |
1b7199fe | 1117 | |
1b7199fe DH |
1118 | drm_connector_ida_init(); |
1119 | idr_init(&drm_minors_idr); | |
1120 | ||
fcc90213 DH |
1121 | ret = drm_sysfs_init(); |
1122 | if (ret < 0) { | |
2cc107dc DH |
1123 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
1124 | goto error; | |
1b7199fe DH |
1125 | } |
1126 | ||
1127 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
1b7199fe | 1128 | |
2cc107dc DH |
1129 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
1130 | if (ret < 0) | |
1131 | goto error; | |
1132 | ||
371c2279 AM |
1133 | drm_core_init_complete = true; |
1134 | ||
e82dfa00 | 1135 | DRM_DEBUG("Initialized\n"); |
1b7199fe | 1136 | return 0; |
1b7199fe | 1137 | |
2cc107dc DH |
1138 | error: |
1139 | drm_core_exit(); | |
1b7199fe DH |
1140 | return ret; |
1141 | } | |
1142 | ||
1b7199fe DH |
1143 | module_init(drm_core_init); |
1144 | module_exit(drm_core_exit); |