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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 | ||
c3b790ea DV |
101 | WARN_ON(dev != minor->dev); |
102 | ||
f96306f9 DV |
103 | put_device(minor->kdev); |
104 | ||
105 | spin_lock_irqsave(&drm_minor_lock, flags); | |
106 | idr_remove(&drm_minors_idr, minor->index); | |
107 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
108 | } | |
109 | ||
05b701f6 DH |
110 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) |
111 | { | |
112 | struct drm_minor *minor; | |
f1b85962 DH |
113 | unsigned long flags; |
114 | int r; | |
05b701f6 | 115 | |
f96306f9 | 116 | minor = drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL); |
05b701f6 DH |
117 | if (!minor) |
118 | return -ENOMEM; | |
119 | ||
120 | minor->type = type; | |
121 | minor->dev = dev; | |
05b701f6 | 122 | |
f1b85962 DH |
123 | idr_preload(GFP_KERNEL); |
124 | spin_lock_irqsave(&drm_minor_lock, flags); | |
125 | r = idr_alloc(&drm_minors_idr, | |
126 | NULL, | |
127 | 64 * type, | |
128 | 64 * (type + 1), | |
129 | GFP_NOWAIT); | |
130 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
131 | idr_preload_end(); | |
132 | ||
133 | if (r < 0) | |
f96306f9 | 134 | return r; |
f1b85962 DH |
135 | |
136 | minor->index = r; | |
137 | ||
f96306f9 DV |
138 | r = drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor); |
139 | if (r) | |
140 | return r; | |
141 | ||
e1728075 | 142 | minor->kdev = drm_sysfs_minor_alloc(minor); |
f96306f9 DV |
143 | if (IS_ERR(minor->kdev)) |
144 | return PTR_ERR(minor->kdev); | |
e1728075 | 145 | |
05b701f6 DH |
146 | *drm_minor_get_slot(dev, type) = minor; |
147 | return 0; | |
bd9dfa98 DH |
148 | } |
149 | ||
afcdbc86 | 150 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 151 | { |
f1b85962 | 152 | struct drm_minor *minor; |
0d639883 | 153 | unsigned long flags; |
1da177e4 | 154 | int ret; |
1da177e4 LT |
155 | |
156 | DRM_DEBUG("\n"); | |
157 | ||
f1b85962 DH |
158 | minor = *drm_minor_get_slot(dev, type); |
159 | if (!minor) | |
05b701f6 DH |
160 | return 0; |
161 | ||
f1b85962 | 162 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 163 | if (ret) { |
156f5a78 | 164 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
a67834f8 | 165 | goto err_debugfs; |
955b12de | 166 | } |
2c14f28b | 167 | |
e1728075 DH |
168 | ret = device_add(minor->kdev); |
169 | if (ret) | |
cb6458f9 | 170 | goto err_debugfs; |
2c14f28b | 171 | |
0d639883 DH |
172 | /* replace NULL with @minor so lookups will succeed from now on */ |
173 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 174 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 175 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 176 | |
f1b85962 | 177 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
178 | return 0; |
179 | ||
cb6458f9 | 180 | err_debugfs: |
f1b85962 | 181 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
182 | return ret; |
183 | } | |
b5e89ed5 | 184 | |
afcdbc86 | 185 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 186 | { |
afcdbc86 | 187 | struct drm_minor *minor; |
0d639883 | 188 | unsigned long flags; |
afcdbc86 DH |
189 | |
190 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 191 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
192 | return; |
193 | ||
f1b85962 | 194 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 195 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 196 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 197 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 198 | |
e1728075 DH |
199 | device_del(minor->kdev); |
200 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 201 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
202 | } |
203 | ||
85e634bc | 204 | /* |
1616c525 DH |
205 | * Looks up the given minor-ID and returns the respective DRM-minor object. The |
206 | * refence-count of the underlying device is increased so you must release this | |
207 | * object with drm_minor_release(). | |
208 | * | |
209 | * As long as you hold this minor, it is guaranteed that the object and the | |
210 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
211 | * unregistered while you hold the minor. | |
1da177e4 | 212 | */ |
1616c525 | 213 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 214 | { |
1616c525 | 215 | struct drm_minor *minor; |
0d639883 | 216 | unsigned long flags; |
1616c525 | 217 | |
0d639883 | 218 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 219 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 | 220 | if (minor) |
9a96f550 | 221 | drm_dev_get(minor->dev); |
0d639883 DH |
222 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
223 | ||
224 | if (!minor) { | |
225 | return ERR_PTR(-ENODEV); | |
c07dcd61 | 226 | } else if (drm_dev_is_unplugged(minor->dev)) { |
9a96f550 | 227 | drm_dev_put(minor->dev); |
1616c525 | 228 | return ERR_PTR(-ENODEV); |
0d639883 | 229 | } |
673a394b | 230 | |
1616c525 DH |
231 | return minor; |
232 | } | |
b5e89ed5 | 233 | |
1616c525 DH |
234 | void drm_minor_release(struct drm_minor *minor) |
235 | { | |
9a96f550 | 236 | drm_dev_put(minor->dev); |
1da177e4 | 237 | } |
112b715e | 238 | |
6e3f797c DV |
239 | /** |
240 | * DOC: driver instance overview | |
241 | * | |
ea0dd85a | 242 | * A device instance for a drm driver is represented by &struct drm_device. This |
33e70110 | 243 | * is initialized with drm_dev_init(), usually from bus-specific ->probe() |
6e3f797c DV |
244 | * callbacks implemented by the driver. The driver then needs to initialize all |
245 | * the various subsystems for the drm device like memory management, vblank | |
246 | * handling, modesetting support and intial output configuration plus obviously | |
33e70110 DV |
247 | * initialize all the corresponding hardware bits. Finally when everything is up |
248 | * and running and ready for userspace the device instance can be published | |
249 | * using drm_dev_register(). | |
6e3f797c DV |
250 | * |
251 | * There is also deprecated support for initalizing device instances using | |
ef40cbf9 | 252 | * bus-specific helpers and the &drm_driver.load callback. But due to |
6e3f797c DV |
253 | * backwards-compatibility needs the device instance have to be published too |
254 | * early, which requires unpretty global locking to make safe and is therefore | |
255 | * only support for existing drivers not yet converted to the new scheme. | |
256 | * | |
257 | * When cleaning up a device instance everything needs to be done in reverse: | |
258 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
259 | * any other resources allocated at device initialization and drop the driver's | |
9a96f550 | 260 | * reference to &drm_device using drm_dev_put(). |
6e3f797c DV |
261 | * |
262 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
263 | * historical baggage. Hence use the reference counting provided by | |
9a96f550 | 264 | * drm_dev_get() and drm_dev_put() only carefully. |
de99f060 NT |
265 | * |
266 | * Display driver example | |
267 | * ~~~~~~~~~~~~~~~~~~~~~~ | |
268 | * | |
269 | * The following example shows a typical structure of a DRM display driver. | |
270 | * The example focus on the probe() function and the other functions that is | |
c3b790ea | 271 | * almost always present and serves as a demonstration of devm_drm_dev_init(). |
de99f060 NT |
272 | * |
273 | * .. code-block:: c | |
274 | * | |
275 | * struct driver_device { | |
276 | * struct drm_device drm; | |
277 | * void *userspace_facing; | |
278 | * struct clk *pclk; | |
279 | * }; | |
280 | * | |
de99f060 NT |
281 | * static struct drm_driver driver_drm_driver = { |
282 | * [...] | |
de99f060 NT |
283 | * }; |
284 | * | |
285 | * static int driver_probe(struct platform_device *pdev) | |
286 | * { | |
287 | * struct driver_device *priv; | |
288 | * struct drm_device *drm; | |
289 | * int ret; | |
290 | * | |
56d8d641 JN |
291 | * // devm_kzalloc() can't be used here because the drm_device ' |
292 | * // lifetime can exceed the device lifetime if driver unbind | |
293 | * // happens when userspace still has open file descriptors. | |
de99f060 NT |
294 | * priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
295 | * if (!priv) | |
296 | * return -ENOMEM; | |
297 | * | |
298 | * drm = &priv->drm; | |
299 | * | |
300 | * ret = devm_drm_dev_init(&pdev->dev, drm, &driver_drm_driver); | |
301 | * if (ret) { | |
302 | * kfree(drm); | |
303 | * return ret; | |
304 | * } | |
5dad34f3 | 305 | * drmm_add_final_kfree(drm, priv); |
de99f060 | 306 | * |
c3b790ea DV |
307 | * ret = drmm_mode_config_init(drm); |
308 | * if (ret) | |
309 | * return ret; | |
de99f060 | 310 | * |
5dad34f3 | 311 | * priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL); |
de99f060 NT |
312 | * if (!priv->userspace_facing) |
313 | * return -ENOMEM; | |
314 | * | |
315 | * priv->pclk = devm_clk_get(dev, "PCLK"); | |
316 | * if (IS_ERR(priv->pclk)) | |
317 | * return PTR_ERR(priv->pclk); | |
318 | * | |
56d8d641 | 319 | * // Further setup, display pipeline etc |
de99f060 NT |
320 | * |
321 | * platform_set_drvdata(pdev, drm); | |
322 | * | |
323 | * drm_mode_config_reset(drm); | |
324 | * | |
325 | * ret = drm_dev_register(drm); | |
326 | * if (ret) | |
327 | * return ret; | |
328 | * | |
329 | * drm_fbdev_generic_setup(drm, 32); | |
330 | * | |
331 | * return 0; | |
332 | * } | |
333 | * | |
56d8d641 | 334 | * // This function is called before the devm_ resources are released |
de99f060 NT |
335 | * static int driver_remove(struct platform_device *pdev) |
336 | * { | |
337 | * struct drm_device *drm = platform_get_drvdata(pdev); | |
338 | * | |
339 | * drm_dev_unregister(drm); | |
340 | * drm_atomic_helper_shutdown(drm) | |
341 | * | |
342 | * return 0; | |
343 | * } | |
344 | * | |
56d8d641 | 345 | * // This function is called on kernel restart and shutdown |
de99f060 NT |
346 | * static void driver_shutdown(struct platform_device *pdev) |
347 | * { | |
348 | * drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); | |
349 | * } | |
350 | * | |
351 | * static int __maybe_unused driver_pm_suspend(struct device *dev) | |
352 | * { | |
353 | * return drm_mode_config_helper_suspend(dev_get_drvdata(dev)); | |
354 | * } | |
355 | * | |
356 | * static int __maybe_unused driver_pm_resume(struct device *dev) | |
357 | * { | |
358 | * drm_mode_config_helper_resume(dev_get_drvdata(dev)); | |
359 | * | |
360 | * return 0; | |
361 | * } | |
362 | * | |
363 | * static const struct dev_pm_ops driver_pm_ops = { | |
364 | * SET_SYSTEM_SLEEP_PM_OPS(driver_pm_suspend, driver_pm_resume) | |
365 | * }; | |
366 | * | |
367 | * static struct platform_driver driver_driver = { | |
368 | * .driver = { | |
369 | * [...] | |
370 | * .pm = &driver_pm_ops, | |
371 | * }, | |
372 | * .probe = driver_probe, | |
373 | * .remove = driver_remove, | |
374 | * .shutdown = driver_shutdown, | |
375 | * }; | |
376 | * module_platform_driver(driver_driver); | |
377 | * | |
378 | * Drivers that want to support device unplugging (USB, DT overlay unload) should | |
379 | * use drm_dev_unplug() instead of drm_dev_unregister(). The driver must protect | |
380 | * regions that is accessing device resources to prevent use after they're | |
381 | * released. This is done using drm_dev_enter() and drm_dev_exit(). There is one | |
382 | * shortcoming however, drm_dev_unplug() marks the drm_device as unplugged before | |
383 | * drm_atomic_helper_shutdown() is called. This means that if the disable code | |
384 | * paths are protected, they will not run on regular driver module unload, | |
385 | * possibily leaving the hardware enabled. | |
6e3f797c DV |
386 | */ |
387 | ||
112b715e | 388 | /** |
c6a1af8a TR |
389 | * drm_put_dev - Unregister and release a DRM device |
390 | * @dev: DRM device | |
112b715e | 391 | * |
c6a1af8a | 392 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 393 | * |
c6a1af8a | 394 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
395 | * |
396 | * Note: Use of this function is deprecated. It will eventually go away | |
9a96f550 | 397 | * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly |
6e3f797c DV |
398 | * instead to make sure that the device isn't userspace accessible any more |
399 | * while teardown is in progress, ensuring that userspace can't access an | |
400 | * inconsistent state. | |
112b715e KH |
401 | */ |
402 | void drm_put_dev(struct drm_device *dev) | |
403 | { | |
112b715e KH |
404 | DRM_DEBUG("\n"); |
405 | ||
406 | if (!dev) { | |
407 | DRM_ERROR("cleanup called no dev\n"); | |
408 | return; | |
409 | } | |
410 | ||
c3a49737 | 411 | drm_dev_unregister(dev); |
9a96f550 | 412 | drm_dev_put(dev); |
112b715e KH |
413 | } |
414 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d | 415 | |
bee330f3 NT |
416 | /** |
417 | * drm_dev_enter - Enter device critical section | |
418 | * @dev: DRM device | |
419 | * @idx: Pointer to index that will be passed to the matching drm_dev_exit() | |
420 | * | |
421 | * This function marks and protects the beginning of a section that should not | |
422 | * be entered after the device has been unplugged. The section end is marked | |
423 | * with drm_dev_exit(). Calls to this function can be nested. | |
424 | * | |
425 | * Returns: | |
426 | * True if it is OK to enter the section, false otherwise. | |
427 | */ | |
428 | bool drm_dev_enter(struct drm_device *dev, int *idx) | |
c07dcd61 | 429 | { |
bee330f3 NT |
430 | *idx = srcu_read_lock(&drm_unplug_srcu); |
431 | ||
432 | if (dev->unplugged) { | |
433 | srcu_read_unlock(&drm_unplug_srcu, *idx); | |
434 | return false; | |
435 | } | |
436 | ||
437 | return true; | |
c07dcd61 | 438 | } |
bee330f3 NT |
439 | EXPORT_SYMBOL(drm_dev_enter); |
440 | ||
441 | /** | |
442 | * drm_dev_exit - Exit device critical section | |
443 | * @idx: index returned from drm_dev_enter() | |
444 | * | |
445 | * This function marks the end of a section that should not be entered after | |
446 | * the device has been unplugged. | |
447 | */ | |
448 | void drm_dev_exit(int idx) | |
c07dcd61 | 449 | { |
bee330f3 | 450 | srcu_read_unlock(&drm_unplug_srcu, idx); |
c07dcd61 | 451 | } |
bee330f3 | 452 | EXPORT_SYMBOL(drm_dev_exit); |
c07dcd61 DV |
453 | |
454 | /** | |
455 | * drm_dev_unplug - unplug a DRM device | |
456 | * @dev: DRM device | |
457 | * | |
458 | * This unplugs a hotpluggable DRM device, which makes it inaccessible to | |
bee330f3 NT |
459 | * userspace operations. Entry-points can use drm_dev_enter() and |
460 | * drm_dev_exit() to protect device resources in a race free manner. This | |
c07dcd61 DV |
461 | * essentially unregisters the device like drm_dev_unregister(), but can be |
462 | * called while there are still open users of @dev. | |
463 | */ | |
464 | void drm_dev_unplug(struct drm_device *dev) | |
2c07a21d | 465 | { |
bee330f3 NT |
466 | /* |
467 | * After synchronizing any critical read section is guaranteed to see | |
468 | * the new value of ->unplugged, and any critical section which might | |
469 | * still have seen the old value of ->unplugged is guaranteed to have | |
470 | * finished. | |
471 | */ | |
472 | dev->unplugged = true; | |
473 | synchronize_srcu(&drm_unplug_srcu); | |
069035c5 OA |
474 | |
475 | drm_dev_unregister(dev); | |
2c07a21d | 476 | } |
c07dcd61 | 477 | EXPORT_SYMBOL(drm_dev_unplug); |
1bb72532 | 478 | |
31bbe16f DH |
479 | /* |
480 | * DRM internal mount | |
481 | * We want to be able to allocate our own "struct address_space" to control | |
482 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
483 | * stand-alone address_space objects, so we need an underlying inode. As there | |
484 | * is no way to allocate an independent inode easily, we need a fake internal | |
485 | * VFS mount-point. | |
486 | * | |
487 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
488 | * frees it again. You are allowed to use iget() and iput() to get references to | |
489 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
490 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
491 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
492 | * between multiple inode-users. You could, technically, call | |
493 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
494 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
495 | */ | |
496 | ||
497 | static int drm_fs_cnt; | |
498 | static struct vfsmount *drm_fs_mnt; | |
499 | ||
4a457910 | 500 | static int drm_fs_init_fs_context(struct fs_context *fc) |
31bbe16f | 501 | { |
4a457910 | 502 | return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM; |
31bbe16f DH |
503 | } |
504 | ||
505 | static struct file_system_type drm_fs_type = { | |
506 | .name = "drm", | |
507 | .owner = THIS_MODULE, | |
4a457910 | 508 | .init_fs_context = drm_fs_init_fs_context, |
31bbe16f DH |
509 | .kill_sb = kill_anon_super, |
510 | }; | |
511 | ||
512 | static struct inode *drm_fs_inode_new(void) | |
513 | { | |
514 | struct inode *inode; | |
515 | int r; | |
516 | ||
517 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
518 | if (r < 0) { | |
519 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
520 | return ERR_PTR(r); | |
521 | } | |
522 | ||
523 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
524 | if (IS_ERR(inode)) | |
525 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
526 | ||
527 | return inode; | |
528 | } | |
529 | ||
530 | static void drm_fs_inode_free(struct inode *inode) | |
531 | { | |
532 | if (inode) { | |
533 | iput(inode); | |
534 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
535 | } | |
536 | } | |
537 | ||
86ab67df DV |
538 | /** |
539 | * DOC: component helper usage recommendations | |
540 | * | |
541 | * DRM drivers that drive hardware where a logical device consists of a pile of | |
542 | * independent hardware blocks are recommended to use the :ref:`component helper | |
543 | * library<component>`. For consistency and better options for code reuse the | |
544 | * following guidelines apply: | |
545 | * | |
546 | * - The entire device initialization procedure should be run from the | |
547 | * &component_master_ops.master_bind callback, starting with drm_dev_init(), | |
548 | * then binding all components with component_bind_all() and finishing with | |
549 | * drm_dev_register(). | |
550 | * | |
551 | * - The opaque pointer passed to all components through component_bind_all() | |
552 | * should point at &struct drm_device of the device instance, not some driver | |
553 | * specific private structure. | |
554 | * | |
555 | * - The component helper fills the niche where further standardization of | |
556 | * interfaces is not practical. When there already is, or will be, a | |
557 | * standardized interface like &drm_bridge or &drm_panel, providing its own | |
558 | * functions to find such components at driver load time, like | |
559 | * drm_of_find_panel_or_bridge(), then the component helper should not be | |
560 | * used. | |
561 | */ | |
562 | ||
2cbf7fc6 DV |
563 | static void drm_dev_init_release(struct drm_device *dev, void *res) |
564 | { | |
565 | drm_legacy_ctxbitmap_cleanup(dev); | |
566 | drm_legacy_remove_map_hash(dev); | |
567 | drm_fs_inode_free(dev->anon_inode); | |
568 | ||
569 | put_device(dev->dev); | |
570 | /* Prevent use-after-free in drm_managed_release when debugging is | |
571 | * enabled. Slightly awkward, but can't really be helped. */ | |
572 | dev->dev = NULL; | |
573 | mutex_destroy(&dev->master_mutex); | |
574 | mutex_destroy(&dev->clientlist_mutex); | |
575 | mutex_destroy(&dev->filelist_mutex); | |
576 | mutex_destroy(&dev->struct_mutex); | |
577 | drm_legacy_destroy_members(dev); | |
578 | } | |
579 | ||
1bb72532 | 580 | /** |
b209aca3 CW |
581 | * drm_dev_init - Initialise new DRM device |
582 | * @dev: DRM device | |
583 | * @driver: DRM driver | |
1bb72532 DH |
584 | * @parent: Parent device object |
585 | * | |
b209aca3 | 586 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 587 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
588 | * with other core subsystems. This should be done last in the device |
589 | * initialization sequence to make sure userspace can't access an inconsistent | |
590 | * state. | |
1bb72532 | 591 | * |
9a96f550 AP |
592 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
593 | * drm_dev_put() to take and drop further ref-counts. | |
099d1c29 | 594 | * |
33e70110 DV |
595 | * It is recommended that drivers embed &struct drm_device into their own device |
596 | * structure. | |
597 | * | |
b209aca3 | 598 | * Drivers that do not want to allocate their own device struct |
ea0dd85a DV |
599 | * embedding &struct drm_device can call drm_dev_alloc() instead. For drivers |
600 | * that do embed &struct drm_device it must be placed first in the overall | |
d82faafd DV |
601 | * structure, and the overall structure must be allocated using kmalloc(): The |
602 | * drm core's release function unconditionally calls kfree() on the @dev pointer | |
f30c9257 CW |
603 | * when the final reference is released. To override this behaviour, and so |
604 | * allow embedding of the drm_device inside the driver's device struct at an | |
605 | * arbitrary offset, you must supply a &drm_driver.release callback and control | |
606 | * the finalization explicitly. | |
b209aca3 | 607 | * |
1bb72532 | 608 | * RETURNS: |
b209aca3 | 609 | * 0 on success, or error code on failure. |
1bb72532 | 610 | */ |
b209aca3 CW |
611 | int drm_dev_init(struct drm_device *dev, |
612 | struct drm_driver *driver, | |
613 | struct device *parent) | |
1bb72532 | 614 | { |
1bb72532 DH |
615 | int ret; |
616 | ||
371c2279 AM |
617 | if (!drm_core_init_complete) { |
618 | DRM_ERROR("DRM core is not initialized\n"); | |
619 | return -ENODEV; | |
620 | } | |
621 | ||
8b6fc114 AP |
622 | if (WARN_ON(!parent)) |
623 | return -EINVAL; | |
f08877e7 | 624 | |
099d1c29 | 625 | kref_init(&dev->ref); |
56be6503 | 626 | dev->dev = get_device(parent); |
1bb72532 DH |
627 | dev->driver = driver; |
628 | ||
c6603c74 DV |
629 | INIT_LIST_HEAD(&dev->managed.resources); |
630 | spin_lock_init(&dev->managed.lock); | |
631 | ||
18ace11f VS |
632 | /* no per-device feature limits by default */ |
633 | dev->driver_features = ~0u; | |
634 | ||
8437dd73 | 635 | drm_legacy_init_members(dev); |
1bb72532 | 636 | INIT_LIST_HEAD(&dev->filelist); |
c76f0f7c NT |
637 | INIT_LIST_HEAD(&dev->filelist_internal); |
638 | INIT_LIST_HEAD(&dev->clientlist); | |
1bb72532 DH |
639 | INIT_LIST_HEAD(&dev->vblank_event_list); |
640 | ||
1bb72532 DH |
641 | spin_lock_init(&dev->event_lock); |
642 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 643 | mutex_init(&dev->filelist_mutex); |
c76f0f7c | 644 | mutex_init(&dev->clientlist_mutex); |
c996fd0b | 645 | mutex_init(&dev->master_mutex); |
1bb72532 | 646 | |
2cbf7fc6 DV |
647 | ret = drmm_add_action(dev, drm_dev_init_release, NULL); |
648 | if (ret) | |
649 | return ret; | |
650 | ||
6796cb16 DH |
651 | dev->anon_inode = drm_fs_inode_new(); |
652 | if (IS_ERR(dev->anon_inode)) { | |
653 | ret = PTR_ERR(dev->anon_inode); | |
654 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
2cbf7fc6 | 655 | goto err; |
6796cb16 DH |
656 | } |
657 | ||
6d6dfcfb | 658 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
659 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
660 | if (ret) | |
f96306f9 | 661 | goto err; |
05b701f6 DH |
662 | } |
663 | ||
a3ccc461 | 664 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 | 665 | if (ret) |
f96306f9 | 666 | goto err; |
05b701f6 | 667 | |
fabb0e2a | 668 | ret = drm_legacy_create_map_hash(dev); |
b209aca3 | 669 | if (ret) |
f96306f9 | 670 | goto err; |
1bb72532 | 671 | |
ba6976c1 | 672 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 673 | |
1bcecfac | 674 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
675 | ret = drm_gem_init(dev); |
676 | if (ret) { | |
677 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
f96306f9 | 678 | goto err; |
1bb72532 DH |
679 | } |
680 | } | |
681 | ||
f08877e7 | 682 | ret = drm_dev_set_unique(dev, dev_name(parent)); |
5079c464 | 683 | if (ret) |
641b9103 | 684 | goto err; |
e112e593 | 685 | |
b209aca3 | 686 | return 0; |
1bb72532 | 687 | |
2cbf7fc6 DV |
688 | err: |
689 | drm_managed_release(dev); | |
690 | ||
b209aca3 CW |
691 | return ret; |
692 | } | |
693 | EXPORT_SYMBOL(drm_dev_init); | |
694 | ||
9b1f1b6b NT |
695 | static void devm_drm_dev_init_release(void *data) |
696 | { | |
697 | drm_dev_put(data); | |
698 | } | |
699 | ||
700 | /** | |
701 | * devm_drm_dev_init - Resource managed drm_dev_init() | |
702 | * @parent: Parent device object | |
703 | * @dev: DRM device | |
704 | * @driver: DRM driver | |
705 | * | |
706 | * Managed drm_dev_init(). The DRM device initialized with this function is | |
c3b790ea | 707 | * automatically put on driver detach using drm_dev_put(). |
9b1f1b6b NT |
708 | * |
709 | * RETURNS: | |
710 | * 0 on success, or error code on failure. | |
711 | */ | |
712 | int devm_drm_dev_init(struct device *parent, | |
713 | struct drm_device *dev, | |
714 | struct drm_driver *driver) | |
715 | { | |
716 | int ret; | |
717 | ||
9b1f1b6b NT |
718 | ret = drm_dev_init(dev, driver, parent); |
719 | if (ret) | |
720 | return ret; | |
721 | ||
722 | ret = devm_add_action(parent, devm_drm_dev_init_release, dev); | |
723 | if (ret) | |
724 | devm_drm_dev_init_release(dev); | |
725 | ||
726 | return ret; | |
727 | } | |
728 | EXPORT_SYMBOL(devm_drm_dev_init); | |
729 | ||
b209aca3 CW |
730 | /** |
731 | * drm_dev_alloc - Allocate new DRM device | |
732 | * @driver: DRM driver to allocate device for | |
733 | * @parent: Parent device object | |
734 | * | |
735 | * Allocate and initialize a new DRM device. No device registration is done. | |
736 | * Call drm_dev_register() to advertice the device to user space and register it | |
737 | * with other core subsystems. This should be done last in the device | |
738 | * initialization sequence to make sure userspace can't access an inconsistent | |
739 | * state. | |
740 | * | |
9a96f550 AP |
741 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
742 | * drm_dev_put() to take and drop further ref-counts. | |
b209aca3 CW |
743 | * |
744 | * Note that for purely virtual devices @parent can be NULL. | |
745 | * | |
ea0dd85a | 746 | * Drivers that wish to subclass or embed &struct drm_device into their |
b209aca3 CW |
747 | * own struct should look at using drm_dev_init() instead. |
748 | * | |
749 | * RETURNS: | |
0f288605 | 750 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 CW |
751 | */ |
752 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
753 | struct device *parent) | |
754 | { | |
755 | struct drm_device *dev; | |
756 | int ret; | |
757 | ||
758 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
759 | if (!dev) | |
0f288605 | 760 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
761 | |
762 | ret = drm_dev_init(dev, driver, parent); | |
763 | if (ret) { | |
764 | kfree(dev); | |
0f288605 | 765 | return ERR_PTR(ret); |
b209aca3 CW |
766 | } |
767 | ||
6f365e56 DV |
768 | drmm_add_final_kfree(dev, dev); |
769 | ||
b209aca3 | 770 | return dev; |
1bb72532 DH |
771 | } |
772 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 773 | |
099d1c29 | 774 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 775 | { |
099d1c29 | 776 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 777 | |
c6603c74 | 778 | if (dev->driver->release) |
f30c9257 | 779 | dev->driver->release(dev); |
c6603c74 DV |
780 | |
781 | drm_managed_release(dev); | |
782 | ||
5dad34f3 | 783 | if (dev->managed.final_kfree) |
c6603c74 | 784 | kfree(dev->managed.final_kfree); |
0dc8fe59 | 785 | } |
099d1c29 DH |
786 | |
787 | /** | |
9a96f550 | 788 | * drm_dev_get - Take reference of a DRM device |
099d1c29 DH |
789 | * @dev: device to take reference of or NULL |
790 | * | |
791 | * This increases the ref-count of @dev by one. You *must* already own a | |
9a96f550 | 792 | * reference when calling this. Use drm_dev_put() to drop this reference |
099d1c29 DH |
793 | * again. |
794 | * | |
795 | * This function never fails. However, this function does not provide *any* | |
796 | * guarantee whether the device is alive or running. It only provides a | |
797 | * reference to the object and the memory associated with it. | |
798 | */ | |
9a96f550 | 799 | void drm_dev_get(struct drm_device *dev) |
099d1c29 DH |
800 | { |
801 | if (dev) | |
802 | kref_get(&dev->ref); | |
803 | } | |
9a96f550 | 804 | EXPORT_SYMBOL(drm_dev_get); |
099d1c29 DH |
805 | |
806 | /** | |
9a96f550 | 807 | * drm_dev_put - Drop reference of a DRM device |
099d1c29 DH |
808 | * @dev: device to drop reference of or NULL |
809 | * | |
810 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
811 | * ref-count drops to zero. | |
812 | */ | |
9a96f550 | 813 | void drm_dev_put(struct drm_device *dev) |
099d1c29 DH |
814 | { |
815 | if (dev) | |
816 | kref_put(&dev->ref, drm_dev_release); | |
817 | } | |
9a96f550 AP |
818 | EXPORT_SYMBOL(drm_dev_put); |
819 | ||
6449b088 DV |
820 | static int create_compat_control_link(struct drm_device *dev) |
821 | { | |
822 | struct drm_minor *minor; | |
823 | char *name; | |
824 | int ret; | |
825 | ||
826 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
827 | return 0; | |
828 | ||
829 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
830 | if (!minor) | |
831 | return 0; | |
832 | ||
833 | /* | |
834 | * Some existing userspace out there uses the existing of the controlD* | |
835 | * sysfs files to figure out whether it's a modeset driver. It only does | |
836 | * readdir, hence a symlink is sufficient (and the least confusing | |
837 | * option). Otherwise controlD* is entirely unused. | |
838 | * | |
839 | * Old controlD chardev have been allocated in the range | |
840 | * 64-127. | |
841 | */ | |
842 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); | |
843 | if (!name) | |
844 | return -ENOMEM; | |
845 | ||
846 | ret = sysfs_create_link(minor->kdev->kobj.parent, | |
847 | &minor->kdev->kobj, | |
848 | name); | |
849 | ||
850 | kfree(name); | |
851 | ||
852 | return ret; | |
853 | } | |
854 | ||
855 | static void remove_compat_control_link(struct drm_device *dev) | |
856 | { | |
857 | struct drm_minor *minor; | |
858 | char *name; | |
859 | ||
860 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
861 | return; | |
862 | ||
863 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
864 | if (!minor) | |
865 | return; | |
866 | ||
7f6df440 | 867 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
6449b088 DV |
868 | if (!name) |
869 | return; | |
870 | ||
871 | sysfs_remove_link(minor->kdev->kobj.parent, name); | |
872 | ||
873 | kfree(name); | |
874 | } | |
875 | ||
c22f0ace DH |
876 | /** |
877 | * drm_dev_register - Register DRM device | |
878 | * @dev: Device to register | |
c6a1af8a | 879 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
880 | * |
881 | * Register the DRM device @dev with the system, advertise device to user-space | |
33e70110 | 882 | * and start normal device operation. @dev must be initialized via drm_dev_init() |
e28cd4d0 | 883 | * previously. |
c22f0ace DH |
884 | * |
885 | * Never call this twice on any device! | |
886 | * | |
6e3f797c | 887 | * NOTE: To ensure backward compatibility with existing drivers method this |
ef40cbf9 DV |
888 | * function calls the &drm_driver.load method after registering the device |
889 | * nodes, creating race conditions. Usage of the &drm_driver.load methods is | |
890 | * therefore deprecated, drivers must perform all initialization before calling | |
6e3f797c DV |
891 | * drm_dev_register(). |
892 | * | |
c22f0ace DH |
893 | * RETURNS: |
894 | * 0 on success, negative error code on failure. | |
895 | */ | |
896 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
897 | { | |
75f6dfe3 | 898 | struct drm_driver *driver = dev->driver; |
c22f0ace DH |
899 | int ret; |
900 | ||
71427795 VS |
901 | if (!driver->load) |
902 | drm_mode_config_validate(dev); | |
903 | ||
5dad34f3 DV |
904 | WARN_ON(!dev->managed.final_kfree); |
905 | ||
4017ad7b DV |
906 | if (drm_dev_needs_global_mutex(dev)) |
907 | mutex_lock(&drm_global_mutex); | |
c22f0ace | 908 | |
afcdbc86 | 909 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
910 | if (ret) |
911 | goto err_minors; | |
c22f0ace | 912 | |
a3ccc461 | 913 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 914 | if (ret) |
05b701f6 | 915 | goto err_minors; |
c22f0ace | 916 | |
6449b088 DV |
917 | ret = create_compat_control_link(dev); |
918 | if (ret) | |
919 | goto err_minors; | |
920 | ||
e0f32f78 DV |
921 | dev->registered = true; |
922 | ||
c22f0ace DH |
923 | if (dev->driver->load) { |
924 | ret = dev->driver->load(dev, flags); | |
925 | if (ret) | |
05b701f6 | 926 | goto err_minors; |
c22f0ace DH |
927 | } |
928 | ||
bee7fb15 | 929 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 930 | drm_modeset_register_all(dev); |
e28cd4d0 | 931 | |
c22f0ace | 932 | ret = 0; |
75f6dfe3 GKB |
933 | |
934 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", | |
935 | driver->name, driver->major, driver->minor, | |
6098909c CW |
936 | driver->patchlevel, driver->date, |
937 | dev->dev ? dev_name(dev->dev) : "virtual device", | |
75f6dfe3 GKB |
938 | dev->primary->index); |
939 | ||
c22f0ace DH |
940 | goto out_unlock; |
941 | ||
05b701f6 | 942 | err_minors: |
6449b088 | 943 | remove_compat_control_link(dev); |
a3ccc461 | 944 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 945 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c22f0ace | 946 | out_unlock: |
4017ad7b DV |
947 | if (drm_dev_needs_global_mutex(dev)) |
948 | mutex_unlock(&drm_global_mutex); | |
c22f0ace DH |
949 | return ret; |
950 | } | |
951 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
952 | |
953 | /** | |
954 | * drm_dev_unregister - Unregister DRM device | |
955 | * @dev: Device to unregister | |
956 | * | |
957 | * Unregister the DRM device from the system. This does the reverse of | |
958 | * drm_dev_register() but does not deallocate the device. The caller must call | |
9a96f550 | 959 | * drm_dev_put() to drop their final reference. |
6e3f797c | 960 | * |
c07dcd61 DV |
961 | * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), |
962 | * which can be called while there are still open users of @dev. | |
963 | * | |
6e3f797c DV |
964 | * This should be called first in the device teardown code to make sure |
965 | * userspace can't access the device instance any more. | |
c3a49737 DH |
966 | */ |
967 | void drm_dev_unregister(struct drm_device *dev) | |
968 | { | |
2e45eeac DV |
969 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
970 | drm_lastclose(dev); | |
c3a49737 | 971 | |
e6e7b48b DV |
972 | dev->registered = false; |
973 | ||
c76f0f7c NT |
974 | drm_client_dev_unregister(dev); |
975 | ||
bee7fb15 | 976 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 977 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 978 | |
c3a49737 DH |
979 | if (dev->driver->unload) |
980 | dev->driver->unload(dev); | |
981 | ||
4efafebe DV |
982 | if (dev->agp) |
983 | drm_pci_agp_destroy(dev); | |
c3a49737 | 984 | |
35a28021 | 985 | drm_legacy_rmmaps(dev); |
c3a49737 | 986 | |
6449b088 | 987 | remove_compat_control_link(dev); |
a3ccc461 | 988 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 989 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c3a49737 DH |
990 | } |
991 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 992 | |
a6b5fac5 GH |
993 | /** |
994 | * drm_dev_set_unique - Set the unique name of a DRM device | |
995 | * @dev: device of which to set the unique name | |
996 | * @name: unique name | |
997 | * | |
33e70110 DV |
998 | * Sets the unique name of a DRM device using the specified string. This is |
999 | * already done by drm_dev_init(), drivers should only override the default | |
1000 | * unique name for backwards compatibility reasons. | |
a6b5fac5 GH |
1001 | * |
1002 | * Return: 0 on success or a negative error code on failure. | |
1003 | */ | |
1004 | int drm_dev_set_unique(struct drm_device *dev, const char *name) | |
1005 | { | |
a5c71fdb DV |
1006 | drmm_kfree(dev, dev->unique); |
1007 | dev->unique = drmm_kstrdup(dev, name, GFP_KERNEL); | |
a6b5fac5 GH |
1008 | |
1009 | return dev->unique ? 0 : -ENOMEM; | |
1010 | } | |
1011 | EXPORT_SYMBOL(drm_dev_set_unique); | |
1012 | ||
1b7199fe DH |
1013 | /* |
1014 | * DRM Core | |
1015 | * The DRM core module initializes all global DRM objects and makes them | |
1016 | * available to drivers. Once setup, drivers can probe their respective | |
1017 | * devices. | |
1018 | * Currently, core management includes: | |
1019 | * - The "DRM-Global" key/value database | |
1020 | * - Global ID management for connectors | |
1021 | * - DRM major number allocation | |
1022 | * - DRM minor management | |
1023 | * - DRM sysfs class | |
1024 | * - DRM debugfs root | |
1025 | * | |
1026 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
1027 | * interface registered on a DRM device, you can request minor numbers from DRM | |
1028 | * core. DRM core takes care of major-number management and char-dev | |
1029 | * registration. A stub ->open() callback forwards any open() requests to the | |
1030 | * registered minor. | |
1031 | */ | |
1032 | ||
1033 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
1034 | { | |
1035 | const struct file_operations *new_fops; | |
1036 | struct drm_minor *minor; | |
1037 | int err; | |
1038 | ||
1039 | DRM_DEBUG("\n"); | |
1040 | ||
1b7199fe | 1041 | minor = drm_minor_acquire(iminor(inode)); |
591a2abf DV |
1042 | if (IS_ERR(minor)) |
1043 | return PTR_ERR(minor); | |
1b7199fe DH |
1044 | |
1045 | new_fops = fops_get(minor->dev->driver->fops); | |
1046 | if (!new_fops) { | |
1047 | err = -ENODEV; | |
591a2abf | 1048 | goto out; |
1b7199fe DH |
1049 | } |
1050 | ||
1051 | replace_fops(filp, new_fops); | |
1052 | if (filp->f_op->open) | |
1053 | err = filp->f_op->open(inode, filp); | |
1054 | else | |
1055 | err = 0; | |
1056 | ||
591a2abf | 1057 | out: |
1b7199fe | 1058 | drm_minor_release(minor); |
591a2abf | 1059 | |
1b7199fe DH |
1060 | return err; |
1061 | } | |
1062 | ||
1063 | static const struct file_operations drm_stub_fops = { | |
1064 | .owner = THIS_MODULE, | |
1065 | .open = drm_stub_open, | |
1066 | .llseek = noop_llseek, | |
1067 | }; | |
1068 | ||
2cc107dc DH |
1069 | static void drm_core_exit(void) |
1070 | { | |
1071 | unregister_chrdev(DRM_MAJOR, "drm"); | |
1072 | debugfs_remove(drm_debugfs_root); | |
1073 | drm_sysfs_destroy(); | |
1074 | idr_destroy(&drm_minors_idr); | |
1075 | drm_connector_ida_destroy(); | |
2cc107dc DH |
1076 | } |
1077 | ||
1b7199fe DH |
1078 | static int __init drm_core_init(void) |
1079 | { | |
2cc107dc | 1080 | int ret; |
1b7199fe | 1081 | |
1b7199fe DH |
1082 | drm_connector_ida_init(); |
1083 | idr_init(&drm_minors_idr); | |
1084 | ||
fcc90213 DH |
1085 | ret = drm_sysfs_init(); |
1086 | if (ret < 0) { | |
2cc107dc DH |
1087 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
1088 | goto error; | |
1b7199fe DH |
1089 | } |
1090 | ||
1091 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
1b7199fe | 1092 | |
2cc107dc DH |
1093 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
1094 | if (ret < 0) | |
1095 | goto error; | |
1096 | ||
371c2279 AM |
1097 | drm_core_init_complete = true; |
1098 | ||
e82dfa00 | 1099 | DRM_DEBUG("Initialized\n"); |
1b7199fe | 1100 | return 0; |
1b7199fe | 1101 | |
2cc107dc DH |
1102 | error: |
1103 | drm_core_exit(); | |
1b7199fe DH |
1104 | return ret; |
1105 | } | |
1106 | ||
1b7199fe DH |
1107 | module_init(drm_core_init); |
1108 | module_exit(drm_core_exit); |