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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 SR |
41 | #include <drm/drm_file.h> |
42 | #include <drm/drm_mode_object.h> | |
43 | #include <drm/drm_print.h> | |
85e634bc | 44 | |
79190ea2 | 45 | #include "drm_crtc_internal.h" |
67d0ec4e | 46 | #include "drm_internal.h" |
0500c04e | 47 | #include "drm_legacy.h" |
1da177e4 | 48 | |
6dc3e22e EG |
49 | /* |
50 | * drm_debug: Enable debug output. | |
0500c04e | 51 | * Bitmask of DRM_UT_x. See include/drm/drm_print.h for details. |
6dc3e22e EG |
52 | */ |
53 | unsigned int drm_debug = 0; | |
1da177e4 LT |
54 | EXPORT_SYMBOL(drm_debug); |
55 | ||
82d5e73f DH |
56 | MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
57 | MODULE_DESCRIPTION("DRM shared core routines"); | |
1da177e4 | 58 | MODULE_LICENSE("GPL and additional rights"); |
6dc3e22e | 59 | MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n" |
a18b2192 LP |
60 | "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n" |
61 | "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n" | |
62 | "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n" | |
63 | "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n" | |
64 | "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n" | |
65 | "\t\tBit 5 (0x20) will enable VBL messages (vblank code)\n" | |
66 | "\t\tBit 7 (0x80) will enable LEASE messages (leasing code)\n" | |
67 | "\t\tBit 8 (0x100) will enable DP messages (displayport code)"); | |
c0758146 | 68 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 69 | |
0d639883 | 70 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 71 | static struct idr drm_minors_idr; |
2c14f28b | 72 | |
371c2279 AM |
73 | /* |
74 | * If the drm core fails to init for whatever reason, | |
75 | * we should prevent any drivers from registering with it. | |
76 | * It's best to check this at drm_dev_init(), as some drivers | |
77 | * prefer to embed struct drm_device into their own device | |
78 | * structure and call drm_dev_init() themselves. | |
79 | */ | |
80 | static bool drm_core_init_complete = false; | |
81 | ||
1b7199fe | 82 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 83 | |
bee330f3 NT |
84 | DEFINE_STATIC_SRCU(drm_unplug_srcu); |
85 | ||
0d639883 DH |
86 | /* |
87 | * DRM Minors | |
88 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
89 | * of them is represented by a drm_minor object. Depending on the capabilities | |
90 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 91 | * |
0d639883 DH |
92 | * Minors can be accessed via dev->$minor_name. This pointer is either |
93 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
94 | * valid. This means, DRM minors have the same life-time as the underlying | |
95 | * device. However, this doesn't mean that the minor is active. Minors are | |
96 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 97 | */ |
0d639883 | 98 | |
05b701f6 DH |
99 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
100 | unsigned int type) | |
101 | { | |
102 | switch (type) { | |
a3ccc461 | 103 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
104 | return &dev->primary; |
105 | case DRM_MINOR_RENDER: | |
106 | return &dev->render; | |
05b701f6 | 107 | default: |
3bd07ccd | 108 | BUG(); |
05b701f6 DH |
109 | } |
110 | } | |
111 | ||
112 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
113 | { | |
114 | struct drm_minor *minor; | |
f1b85962 DH |
115 | unsigned long flags; |
116 | int r; | |
05b701f6 DH |
117 | |
118 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
119 | if (!minor) | |
120 | return -ENOMEM; | |
121 | ||
122 | minor->type = type; | |
123 | minor->dev = dev; | |
05b701f6 | 124 | |
f1b85962 DH |
125 | idr_preload(GFP_KERNEL); |
126 | spin_lock_irqsave(&drm_minor_lock, flags); | |
127 | r = idr_alloc(&drm_minors_idr, | |
128 | NULL, | |
129 | 64 * type, | |
130 | 64 * (type + 1), | |
131 | GFP_NOWAIT); | |
132 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
133 | idr_preload_end(); | |
134 | ||
135 | if (r < 0) | |
136 | goto err_free; | |
137 | ||
138 | minor->index = r; | |
139 | ||
e1728075 DH |
140 | minor->kdev = drm_sysfs_minor_alloc(minor); |
141 | if (IS_ERR(minor->kdev)) { | |
142 | r = PTR_ERR(minor->kdev); | |
143 | goto err_index; | |
144 | } | |
145 | ||
05b701f6 DH |
146 | *drm_minor_get_slot(dev, type) = minor; |
147 | return 0; | |
f1b85962 | 148 | |
e1728075 DH |
149 | err_index: |
150 | spin_lock_irqsave(&drm_minor_lock, flags); | |
151 | idr_remove(&drm_minors_idr, minor->index); | |
152 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
153 | err_free: |
154 | kfree(minor); | |
155 | return r; | |
05b701f6 DH |
156 | } |
157 | ||
bd9dfa98 DH |
158 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
159 | { | |
f1b85962 DH |
160 | struct drm_minor **slot, *minor; |
161 | unsigned long flags; | |
bd9dfa98 DH |
162 | |
163 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
164 | minor = *slot; |
165 | if (!minor) | |
166 | return; | |
167 | ||
e1728075 | 168 | put_device(minor->kdev); |
f1b85962 DH |
169 | |
170 | spin_lock_irqsave(&drm_minor_lock, flags); | |
171 | idr_remove(&drm_minors_idr, minor->index); | |
172 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
173 | ||
174 | kfree(minor); | |
175 | *slot = NULL; | |
bd9dfa98 DH |
176 | } |
177 | ||
afcdbc86 | 178 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 179 | { |
f1b85962 | 180 | struct drm_minor *minor; |
0d639883 | 181 | unsigned long flags; |
1da177e4 | 182 | int ret; |
1da177e4 LT |
183 | |
184 | DRM_DEBUG("\n"); | |
185 | ||
f1b85962 DH |
186 | minor = *drm_minor_get_slot(dev, type); |
187 | if (!minor) | |
05b701f6 DH |
188 | return 0; |
189 | ||
f1b85962 | 190 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 191 | if (ret) { |
156f5a78 | 192 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
a67834f8 | 193 | goto err_debugfs; |
955b12de | 194 | } |
2c14f28b | 195 | |
e1728075 DH |
196 | ret = device_add(minor->kdev); |
197 | if (ret) | |
cb6458f9 | 198 | goto err_debugfs; |
2c14f28b | 199 | |
0d639883 DH |
200 | /* replace NULL with @minor so lookups will succeed from now on */ |
201 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 202 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 203 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 204 | |
f1b85962 | 205 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
206 | return 0; |
207 | ||
cb6458f9 | 208 | err_debugfs: |
f1b85962 | 209 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
210 | return ret; |
211 | } | |
b5e89ed5 | 212 | |
afcdbc86 | 213 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 214 | { |
afcdbc86 | 215 | struct drm_minor *minor; |
0d639883 | 216 | unsigned long flags; |
afcdbc86 DH |
217 | |
218 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 219 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
220 | return; |
221 | ||
f1b85962 | 222 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 223 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 224 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 225 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 226 | |
e1728075 DH |
227 | device_del(minor->kdev); |
228 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 229 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
230 | } |
231 | ||
85e634bc | 232 | /* |
1616c525 DH |
233 | * Looks up the given minor-ID and returns the respective DRM-minor object. The |
234 | * refence-count of the underlying device is increased so you must release this | |
235 | * object with drm_minor_release(). | |
236 | * | |
237 | * As long as you hold this minor, it is guaranteed that the object and the | |
238 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
239 | * unregistered while you hold the minor. | |
1da177e4 | 240 | */ |
1616c525 | 241 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 242 | { |
1616c525 | 243 | struct drm_minor *minor; |
0d639883 | 244 | unsigned long flags; |
1616c525 | 245 | |
0d639883 | 246 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 247 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 | 248 | if (minor) |
9a96f550 | 249 | drm_dev_get(minor->dev); |
0d639883 DH |
250 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
251 | ||
252 | if (!minor) { | |
253 | return ERR_PTR(-ENODEV); | |
c07dcd61 | 254 | } else if (drm_dev_is_unplugged(minor->dev)) { |
9a96f550 | 255 | drm_dev_put(minor->dev); |
1616c525 | 256 | return ERR_PTR(-ENODEV); |
0d639883 | 257 | } |
673a394b | 258 | |
1616c525 DH |
259 | return minor; |
260 | } | |
b5e89ed5 | 261 | |
1616c525 DH |
262 | void drm_minor_release(struct drm_minor *minor) |
263 | { | |
9a96f550 | 264 | drm_dev_put(minor->dev); |
1da177e4 | 265 | } |
112b715e | 266 | |
6e3f797c DV |
267 | /** |
268 | * DOC: driver instance overview | |
269 | * | |
ea0dd85a | 270 | * A device instance for a drm driver is represented by &struct drm_device. This |
33e70110 | 271 | * is initialized with drm_dev_init(), usually from bus-specific ->probe() |
6e3f797c DV |
272 | * callbacks implemented by the driver. The driver then needs to initialize all |
273 | * the various subsystems for the drm device like memory management, vblank | |
274 | * handling, modesetting support and intial output configuration plus obviously | |
33e70110 DV |
275 | * initialize all the corresponding hardware bits. Finally when everything is up |
276 | * and running and ready for userspace the device instance can be published | |
277 | * using drm_dev_register(). | |
6e3f797c DV |
278 | * |
279 | * There is also deprecated support for initalizing device instances using | |
ef40cbf9 | 280 | * bus-specific helpers and the &drm_driver.load callback. But due to |
6e3f797c DV |
281 | * backwards-compatibility needs the device instance have to be published too |
282 | * early, which requires unpretty global locking to make safe and is therefore | |
283 | * only support for existing drivers not yet converted to the new scheme. | |
284 | * | |
285 | * When cleaning up a device instance everything needs to be done in reverse: | |
286 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
287 | * any other resources allocated at device initialization and drop the driver's | |
9a96f550 | 288 | * reference to &drm_device using drm_dev_put(). |
6e3f797c DV |
289 | * |
290 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
291 | * historical baggage. Hence use the reference counting provided by | |
9a96f550 | 292 | * drm_dev_get() and drm_dev_put() only carefully. |
de99f060 NT |
293 | * |
294 | * Display driver example | |
295 | * ~~~~~~~~~~~~~~~~~~~~~~ | |
296 | * | |
297 | * The following example shows a typical structure of a DRM display driver. | |
298 | * The example focus on the probe() function and the other functions that is | |
299 | * almost always present and serves as a demonstration of devm_drm_dev_init() | |
300 | * usage with its accompanying drm_driver->release callback. | |
301 | * | |
302 | * .. code-block:: c | |
303 | * | |
304 | * struct driver_device { | |
305 | * struct drm_device drm; | |
306 | * void *userspace_facing; | |
307 | * struct clk *pclk; | |
308 | * }; | |
309 | * | |
310 | * static void driver_drm_release(struct drm_device *drm) | |
311 | * { | |
312 | * struct driver_device *priv = container_of(...); | |
313 | * | |
314 | * drm_mode_config_cleanup(drm); | |
315 | * drm_dev_fini(drm); | |
316 | * kfree(priv->userspace_facing); | |
317 | * kfree(priv); | |
318 | * } | |
319 | * | |
320 | * static struct drm_driver driver_drm_driver = { | |
321 | * [...] | |
322 | * .release = driver_drm_release, | |
323 | * }; | |
324 | * | |
325 | * static int driver_probe(struct platform_device *pdev) | |
326 | * { | |
327 | * struct driver_device *priv; | |
328 | * struct drm_device *drm; | |
329 | * int ret; | |
330 | * | |
331 | * [ | |
332 | * devm_kzalloc() can't be used here because the drm_device | |
333 | * lifetime can exceed the device lifetime if driver unbind | |
334 | * happens when userspace still has open file descriptors. | |
335 | * ] | |
336 | * priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
337 | * if (!priv) | |
338 | * return -ENOMEM; | |
339 | * | |
340 | * drm = &priv->drm; | |
341 | * | |
342 | * ret = devm_drm_dev_init(&pdev->dev, drm, &driver_drm_driver); | |
343 | * if (ret) { | |
344 | * kfree(drm); | |
345 | * return ret; | |
346 | * } | |
347 | * | |
348 | * drm_mode_config_init(drm); | |
349 | * | |
350 | * priv->userspace_facing = kzalloc(..., GFP_KERNEL); | |
351 | * if (!priv->userspace_facing) | |
352 | * return -ENOMEM; | |
353 | * | |
354 | * priv->pclk = devm_clk_get(dev, "PCLK"); | |
355 | * if (IS_ERR(priv->pclk)) | |
356 | * return PTR_ERR(priv->pclk); | |
357 | * | |
358 | * [ Further setup, display pipeline etc ] | |
359 | * | |
360 | * platform_set_drvdata(pdev, drm); | |
361 | * | |
362 | * drm_mode_config_reset(drm); | |
363 | * | |
364 | * ret = drm_dev_register(drm); | |
365 | * if (ret) | |
366 | * return ret; | |
367 | * | |
368 | * drm_fbdev_generic_setup(drm, 32); | |
369 | * | |
370 | * return 0; | |
371 | * } | |
372 | * | |
373 | * [ This function is called before the devm_ resources are released ] | |
374 | * static int driver_remove(struct platform_device *pdev) | |
375 | * { | |
376 | * struct drm_device *drm = platform_get_drvdata(pdev); | |
377 | * | |
378 | * drm_dev_unregister(drm); | |
379 | * drm_atomic_helper_shutdown(drm) | |
380 | * | |
381 | * return 0; | |
382 | * } | |
383 | * | |
384 | * [ This function is called on kernel restart and shutdown ] | |
385 | * static void driver_shutdown(struct platform_device *pdev) | |
386 | * { | |
387 | * drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); | |
388 | * } | |
389 | * | |
390 | * static int __maybe_unused driver_pm_suspend(struct device *dev) | |
391 | * { | |
392 | * return drm_mode_config_helper_suspend(dev_get_drvdata(dev)); | |
393 | * } | |
394 | * | |
395 | * static int __maybe_unused driver_pm_resume(struct device *dev) | |
396 | * { | |
397 | * drm_mode_config_helper_resume(dev_get_drvdata(dev)); | |
398 | * | |
399 | * return 0; | |
400 | * } | |
401 | * | |
402 | * static const struct dev_pm_ops driver_pm_ops = { | |
403 | * SET_SYSTEM_SLEEP_PM_OPS(driver_pm_suspend, driver_pm_resume) | |
404 | * }; | |
405 | * | |
406 | * static struct platform_driver driver_driver = { | |
407 | * .driver = { | |
408 | * [...] | |
409 | * .pm = &driver_pm_ops, | |
410 | * }, | |
411 | * .probe = driver_probe, | |
412 | * .remove = driver_remove, | |
413 | * .shutdown = driver_shutdown, | |
414 | * }; | |
415 | * module_platform_driver(driver_driver); | |
416 | * | |
417 | * Drivers that want to support device unplugging (USB, DT overlay unload) should | |
418 | * use drm_dev_unplug() instead of drm_dev_unregister(). The driver must protect | |
419 | * regions that is accessing device resources to prevent use after they're | |
420 | * released. This is done using drm_dev_enter() and drm_dev_exit(). There is one | |
421 | * shortcoming however, drm_dev_unplug() marks the drm_device as unplugged before | |
422 | * drm_atomic_helper_shutdown() is called. This means that if the disable code | |
423 | * paths are protected, they will not run on regular driver module unload, | |
424 | * possibily leaving the hardware enabled. | |
6e3f797c DV |
425 | */ |
426 | ||
112b715e | 427 | /** |
c6a1af8a TR |
428 | * drm_put_dev - Unregister and release a DRM device |
429 | * @dev: DRM device | |
112b715e | 430 | * |
c6a1af8a | 431 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 432 | * |
c6a1af8a | 433 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
434 | * |
435 | * Note: Use of this function is deprecated. It will eventually go away | |
9a96f550 | 436 | * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly |
6e3f797c DV |
437 | * instead to make sure that the device isn't userspace accessible any more |
438 | * while teardown is in progress, ensuring that userspace can't access an | |
439 | * inconsistent state. | |
112b715e KH |
440 | */ |
441 | void drm_put_dev(struct drm_device *dev) | |
442 | { | |
112b715e KH |
443 | DRM_DEBUG("\n"); |
444 | ||
445 | if (!dev) { | |
446 | DRM_ERROR("cleanup called no dev\n"); | |
447 | return; | |
448 | } | |
449 | ||
c3a49737 | 450 | drm_dev_unregister(dev); |
9a96f550 | 451 | drm_dev_put(dev); |
112b715e KH |
452 | } |
453 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d | 454 | |
bee330f3 NT |
455 | /** |
456 | * drm_dev_enter - Enter device critical section | |
457 | * @dev: DRM device | |
458 | * @idx: Pointer to index that will be passed to the matching drm_dev_exit() | |
459 | * | |
460 | * This function marks and protects the beginning of a section that should not | |
461 | * be entered after the device has been unplugged. The section end is marked | |
462 | * with drm_dev_exit(). Calls to this function can be nested. | |
463 | * | |
464 | * Returns: | |
465 | * True if it is OK to enter the section, false otherwise. | |
466 | */ | |
467 | bool drm_dev_enter(struct drm_device *dev, int *idx) | |
c07dcd61 | 468 | { |
bee330f3 NT |
469 | *idx = srcu_read_lock(&drm_unplug_srcu); |
470 | ||
471 | if (dev->unplugged) { | |
472 | srcu_read_unlock(&drm_unplug_srcu, *idx); | |
473 | return false; | |
474 | } | |
475 | ||
476 | return true; | |
c07dcd61 | 477 | } |
bee330f3 NT |
478 | EXPORT_SYMBOL(drm_dev_enter); |
479 | ||
480 | /** | |
481 | * drm_dev_exit - Exit device critical section | |
482 | * @idx: index returned from drm_dev_enter() | |
483 | * | |
484 | * This function marks the end of a section that should not be entered after | |
485 | * the device has been unplugged. | |
486 | */ | |
487 | void drm_dev_exit(int idx) | |
c07dcd61 | 488 | { |
bee330f3 | 489 | srcu_read_unlock(&drm_unplug_srcu, idx); |
c07dcd61 | 490 | } |
bee330f3 | 491 | EXPORT_SYMBOL(drm_dev_exit); |
c07dcd61 DV |
492 | |
493 | /** | |
494 | * drm_dev_unplug - unplug a DRM device | |
495 | * @dev: DRM device | |
496 | * | |
497 | * This unplugs a hotpluggable DRM device, which makes it inaccessible to | |
bee330f3 NT |
498 | * userspace operations. Entry-points can use drm_dev_enter() and |
499 | * drm_dev_exit() to protect device resources in a race free manner. This | |
c07dcd61 DV |
500 | * essentially unregisters the device like drm_dev_unregister(), but can be |
501 | * called while there are still open users of @dev. | |
502 | */ | |
503 | void drm_dev_unplug(struct drm_device *dev) | |
2c07a21d | 504 | { |
bee330f3 NT |
505 | /* |
506 | * After synchronizing any critical read section is guaranteed to see | |
507 | * the new value of ->unplugged, and any critical section which might | |
508 | * still have seen the old value of ->unplugged is guaranteed to have | |
509 | * finished. | |
510 | */ | |
511 | dev->unplugged = true; | |
512 | synchronize_srcu(&drm_unplug_srcu); | |
069035c5 OA |
513 | |
514 | drm_dev_unregister(dev); | |
2c07a21d | 515 | } |
c07dcd61 | 516 | EXPORT_SYMBOL(drm_dev_unplug); |
1bb72532 | 517 | |
31bbe16f DH |
518 | /* |
519 | * DRM internal mount | |
520 | * We want to be able to allocate our own "struct address_space" to control | |
521 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
522 | * stand-alone address_space objects, so we need an underlying inode. As there | |
523 | * is no way to allocate an independent inode easily, we need a fake internal | |
524 | * VFS mount-point. | |
525 | * | |
526 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
527 | * frees it again. You are allowed to use iget() and iput() to get references to | |
528 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
529 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
530 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
531 | * between multiple inode-users. You could, technically, call | |
532 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
533 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
534 | */ | |
535 | ||
536 | static int drm_fs_cnt; | |
537 | static struct vfsmount *drm_fs_mnt; | |
538 | ||
4a457910 | 539 | static int drm_fs_init_fs_context(struct fs_context *fc) |
31bbe16f | 540 | { |
4a457910 | 541 | return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM; |
31bbe16f DH |
542 | } |
543 | ||
544 | static struct file_system_type drm_fs_type = { | |
545 | .name = "drm", | |
546 | .owner = THIS_MODULE, | |
4a457910 | 547 | .init_fs_context = drm_fs_init_fs_context, |
31bbe16f DH |
548 | .kill_sb = kill_anon_super, |
549 | }; | |
550 | ||
551 | static struct inode *drm_fs_inode_new(void) | |
552 | { | |
553 | struct inode *inode; | |
554 | int r; | |
555 | ||
556 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
557 | if (r < 0) { | |
558 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
559 | return ERR_PTR(r); | |
560 | } | |
561 | ||
562 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
563 | if (IS_ERR(inode)) | |
564 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
565 | ||
566 | return inode; | |
567 | } | |
568 | ||
569 | static void drm_fs_inode_free(struct inode *inode) | |
570 | { | |
571 | if (inode) { | |
572 | iput(inode); | |
573 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
574 | } | |
575 | } | |
576 | ||
86ab67df DV |
577 | /** |
578 | * DOC: component helper usage recommendations | |
579 | * | |
580 | * DRM drivers that drive hardware where a logical device consists of a pile of | |
581 | * independent hardware blocks are recommended to use the :ref:`component helper | |
582 | * library<component>`. For consistency and better options for code reuse the | |
583 | * following guidelines apply: | |
584 | * | |
585 | * - The entire device initialization procedure should be run from the | |
586 | * &component_master_ops.master_bind callback, starting with drm_dev_init(), | |
587 | * then binding all components with component_bind_all() and finishing with | |
588 | * drm_dev_register(). | |
589 | * | |
590 | * - The opaque pointer passed to all components through component_bind_all() | |
591 | * should point at &struct drm_device of the device instance, not some driver | |
592 | * specific private structure. | |
593 | * | |
594 | * - The component helper fills the niche where further standardization of | |
595 | * interfaces is not practical. When there already is, or will be, a | |
596 | * standardized interface like &drm_bridge or &drm_panel, providing its own | |
597 | * functions to find such components at driver load time, like | |
598 | * drm_of_find_panel_or_bridge(), then the component helper should not be | |
599 | * used. | |
600 | */ | |
601 | ||
1bb72532 | 602 | /** |
b209aca3 CW |
603 | * drm_dev_init - Initialise new DRM device |
604 | * @dev: DRM device | |
605 | * @driver: DRM driver | |
1bb72532 DH |
606 | * @parent: Parent device object |
607 | * | |
b209aca3 | 608 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 609 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
610 | * with other core subsystems. This should be done last in the device |
611 | * initialization sequence to make sure userspace can't access an inconsistent | |
612 | * state. | |
1bb72532 | 613 | * |
9a96f550 AP |
614 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
615 | * drm_dev_put() to take and drop further ref-counts. | |
099d1c29 | 616 | * |
33e70110 DV |
617 | * It is recommended that drivers embed &struct drm_device into their own device |
618 | * structure. | |
619 | * | |
b209aca3 | 620 | * Drivers that do not want to allocate their own device struct |
ea0dd85a DV |
621 | * embedding &struct drm_device can call drm_dev_alloc() instead. For drivers |
622 | * that do embed &struct drm_device it must be placed first in the overall | |
d82faafd DV |
623 | * structure, and the overall structure must be allocated using kmalloc(): The |
624 | * drm core's release function unconditionally calls kfree() on the @dev pointer | |
f30c9257 CW |
625 | * when the final reference is released. To override this behaviour, and so |
626 | * allow embedding of the drm_device inside the driver's device struct at an | |
627 | * arbitrary offset, you must supply a &drm_driver.release callback and control | |
628 | * the finalization explicitly. | |
b209aca3 | 629 | * |
1bb72532 | 630 | * RETURNS: |
b209aca3 | 631 | * 0 on success, or error code on failure. |
1bb72532 | 632 | */ |
b209aca3 CW |
633 | int drm_dev_init(struct drm_device *dev, |
634 | struct drm_driver *driver, | |
635 | struct device *parent) | |
1bb72532 | 636 | { |
1bb72532 DH |
637 | int ret; |
638 | ||
371c2279 AM |
639 | if (!drm_core_init_complete) { |
640 | DRM_ERROR("DRM core is not initialized\n"); | |
641 | return -ENODEV; | |
642 | } | |
643 | ||
f08877e7 EV |
644 | BUG_ON(!parent); |
645 | ||
099d1c29 | 646 | kref_init(&dev->ref); |
56be6503 | 647 | dev->dev = get_device(parent); |
1bb72532 DH |
648 | dev->driver = driver; |
649 | ||
18ace11f VS |
650 | /* no per-device feature limits by default */ |
651 | dev->driver_features = ~0u; | |
652 | ||
8437dd73 | 653 | drm_legacy_init_members(dev); |
1bb72532 | 654 | INIT_LIST_HEAD(&dev->filelist); |
c76f0f7c NT |
655 | INIT_LIST_HEAD(&dev->filelist_internal); |
656 | INIT_LIST_HEAD(&dev->clientlist); | |
1bb72532 DH |
657 | INIT_LIST_HEAD(&dev->vblank_event_list); |
658 | ||
1bb72532 DH |
659 | spin_lock_init(&dev->event_lock); |
660 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 661 | mutex_init(&dev->filelist_mutex); |
c76f0f7c | 662 | mutex_init(&dev->clientlist_mutex); |
c996fd0b | 663 | mutex_init(&dev->master_mutex); |
1bb72532 | 664 | |
6796cb16 DH |
665 | dev->anon_inode = drm_fs_inode_new(); |
666 | if (IS_ERR(dev->anon_inode)) { | |
667 | ret = PTR_ERR(dev->anon_inode); | |
668 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 669 | goto err_free; |
6796cb16 DH |
670 | } |
671 | ||
6d6dfcfb | 672 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
673 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
674 | if (ret) | |
675 | goto err_minors; | |
676 | } | |
677 | ||
a3ccc461 | 678 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 DH |
679 | if (ret) |
680 | goto err_minors; | |
681 | ||
fabb0e2a | 682 | ret = drm_legacy_create_map_hash(dev); |
b209aca3 | 683 | if (ret) |
05b701f6 | 684 | goto err_minors; |
1bb72532 | 685 | |
ba6976c1 | 686 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 687 | |
1bcecfac | 688 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
689 | ret = drm_gem_init(dev); |
690 | if (ret) { | |
691 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
692 | goto err_ctxbitmap; | |
693 | } | |
694 | } | |
695 | ||
f08877e7 | 696 | ret = drm_dev_set_unique(dev, dev_name(parent)); |
5079c464 DV |
697 | if (ret) |
698 | goto err_setunique; | |
e112e593 | 699 | |
b209aca3 | 700 | return 0; |
1bb72532 | 701 | |
e112e593 NI |
702 | err_setunique: |
703 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
704 | drm_gem_destroy(dev); | |
1bb72532 | 705 | err_ctxbitmap: |
e7b96070 | 706 | drm_legacy_ctxbitmap_cleanup(dev); |
fabb0e2a | 707 | drm_legacy_remove_map_hash(dev); |
05b701f6 | 708 | err_minors: |
a3ccc461 | 709 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 | 710 | drm_minor_free(dev, DRM_MINOR_RENDER); |
6796cb16 | 711 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 712 | err_free: |
56be6503 | 713 | put_device(dev->dev); |
c996fd0b | 714 | mutex_destroy(&dev->master_mutex); |
c76f0f7c | 715 | mutex_destroy(&dev->clientlist_mutex); |
f92e1ee5 JL |
716 | mutex_destroy(&dev->filelist_mutex); |
717 | mutex_destroy(&dev->struct_mutex); | |
8437dd73 | 718 | drm_legacy_destroy_members(dev); |
b209aca3 CW |
719 | return ret; |
720 | } | |
721 | EXPORT_SYMBOL(drm_dev_init); | |
722 | ||
9b1f1b6b NT |
723 | static void devm_drm_dev_init_release(void *data) |
724 | { | |
725 | drm_dev_put(data); | |
726 | } | |
727 | ||
728 | /** | |
729 | * devm_drm_dev_init - Resource managed drm_dev_init() | |
730 | * @parent: Parent device object | |
731 | * @dev: DRM device | |
732 | * @driver: DRM driver | |
733 | * | |
734 | * Managed drm_dev_init(). The DRM device initialized with this function is | |
735 | * automatically put on driver detach using drm_dev_put(). You must supply a | |
736 | * &drm_driver.release callback to control the finalization explicitly. | |
737 | * | |
738 | * RETURNS: | |
739 | * 0 on success, or error code on failure. | |
740 | */ | |
741 | int devm_drm_dev_init(struct device *parent, | |
742 | struct drm_device *dev, | |
743 | struct drm_driver *driver) | |
744 | { | |
745 | int ret; | |
746 | ||
747 | if (WARN_ON(!parent || !driver->release)) | |
748 | return -EINVAL; | |
749 | ||
750 | ret = drm_dev_init(dev, driver, parent); | |
751 | if (ret) | |
752 | return ret; | |
753 | ||
754 | ret = devm_add_action(parent, devm_drm_dev_init_release, dev); | |
755 | if (ret) | |
756 | devm_drm_dev_init_release(dev); | |
757 | ||
758 | return ret; | |
759 | } | |
760 | EXPORT_SYMBOL(devm_drm_dev_init); | |
761 | ||
f30c9257 CW |
762 | /** |
763 | * drm_dev_fini - Finalize a dead DRM device | |
764 | * @dev: DRM device | |
765 | * | |
766 | * Finalize a dead DRM device. This is the converse to drm_dev_init() and | |
767 | * frees up all data allocated by it. All driver private data should be | |
768 | * finalized first. Note that this function does not free the @dev, that is | |
769 | * left to the caller. | |
770 | * | |
771 | * The ref-count of @dev must be zero, and drm_dev_fini() should only be called | |
772 | * from a &drm_driver.release callback. | |
773 | */ | |
774 | void drm_dev_fini(struct drm_device *dev) | |
775 | { | |
776 | drm_vblank_cleanup(dev); | |
777 | ||
778 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
779 | drm_gem_destroy(dev); | |
780 | ||
781 | drm_legacy_ctxbitmap_cleanup(dev); | |
fabb0e2a | 782 | drm_legacy_remove_map_hash(dev); |
f30c9257 CW |
783 | drm_fs_inode_free(dev->anon_inode); |
784 | ||
785 | drm_minor_free(dev, DRM_MINOR_PRIMARY); | |
786 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
f30c9257 | 787 | |
56be6503 NT |
788 | put_device(dev->dev); |
789 | ||
f30c9257 | 790 | mutex_destroy(&dev->master_mutex); |
c76f0f7c | 791 | mutex_destroy(&dev->clientlist_mutex); |
f30c9257 CW |
792 | mutex_destroy(&dev->filelist_mutex); |
793 | mutex_destroy(&dev->struct_mutex); | |
8437dd73 | 794 | drm_legacy_destroy_members(dev); |
f30c9257 CW |
795 | kfree(dev->unique); |
796 | } | |
797 | EXPORT_SYMBOL(drm_dev_fini); | |
798 | ||
b209aca3 CW |
799 | /** |
800 | * drm_dev_alloc - Allocate new DRM device | |
801 | * @driver: DRM driver to allocate device for | |
802 | * @parent: Parent device object | |
803 | * | |
804 | * Allocate and initialize a new DRM device. No device registration is done. | |
805 | * Call drm_dev_register() to advertice the device to user space and register it | |
806 | * with other core subsystems. This should be done last in the device | |
807 | * initialization sequence to make sure userspace can't access an inconsistent | |
808 | * state. | |
809 | * | |
9a96f550 AP |
810 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
811 | * drm_dev_put() to take and drop further ref-counts. | |
b209aca3 CW |
812 | * |
813 | * Note that for purely virtual devices @parent can be NULL. | |
814 | * | |
ea0dd85a | 815 | * Drivers that wish to subclass or embed &struct drm_device into their |
b209aca3 CW |
816 | * own struct should look at using drm_dev_init() instead. |
817 | * | |
818 | * RETURNS: | |
0f288605 | 819 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 CW |
820 | */ |
821 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
822 | struct device *parent) | |
823 | { | |
824 | struct drm_device *dev; | |
825 | int ret; | |
826 | ||
827 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
828 | if (!dev) | |
0f288605 | 829 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
830 | |
831 | ret = drm_dev_init(dev, driver, parent); | |
832 | if (ret) { | |
833 | kfree(dev); | |
0f288605 | 834 | return ERR_PTR(ret); |
b209aca3 CW |
835 | } |
836 | ||
837 | return dev; | |
1bb72532 DH |
838 | } |
839 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 840 | |
099d1c29 | 841 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 842 | { |
099d1c29 | 843 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 844 | |
f30c9257 CW |
845 | if (dev->driver->release) { |
846 | dev->driver->release(dev); | |
847 | } else { | |
848 | drm_dev_fini(dev); | |
849 | kfree(dev); | |
850 | } | |
0dc8fe59 | 851 | } |
099d1c29 DH |
852 | |
853 | /** | |
9a96f550 | 854 | * drm_dev_get - Take reference of a DRM device |
099d1c29 DH |
855 | * @dev: device to take reference of or NULL |
856 | * | |
857 | * This increases the ref-count of @dev by one. You *must* already own a | |
9a96f550 | 858 | * reference when calling this. Use drm_dev_put() to drop this reference |
099d1c29 DH |
859 | * again. |
860 | * | |
861 | * This function never fails. However, this function does not provide *any* | |
862 | * guarantee whether the device is alive or running. It only provides a | |
863 | * reference to the object and the memory associated with it. | |
864 | */ | |
9a96f550 | 865 | void drm_dev_get(struct drm_device *dev) |
099d1c29 DH |
866 | { |
867 | if (dev) | |
868 | kref_get(&dev->ref); | |
869 | } | |
9a96f550 | 870 | EXPORT_SYMBOL(drm_dev_get); |
099d1c29 DH |
871 | |
872 | /** | |
9a96f550 | 873 | * drm_dev_put - Drop reference of a DRM device |
099d1c29 DH |
874 | * @dev: device to drop reference of or NULL |
875 | * | |
876 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
877 | * ref-count drops to zero. | |
878 | */ | |
9a96f550 | 879 | void drm_dev_put(struct drm_device *dev) |
099d1c29 DH |
880 | { |
881 | if (dev) | |
882 | kref_put(&dev->ref, drm_dev_release); | |
883 | } | |
9a96f550 AP |
884 | EXPORT_SYMBOL(drm_dev_put); |
885 | ||
6449b088 DV |
886 | static int create_compat_control_link(struct drm_device *dev) |
887 | { | |
888 | struct drm_minor *minor; | |
889 | char *name; | |
890 | int ret; | |
891 | ||
892 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
893 | return 0; | |
894 | ||
895 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
896 | if (!minor) | |
897 | return 0; | |
898 | ||
899 | /* | |
900 | * Some existing userspace out there uses the existing of the controlD* | |
901 | * sysfs files to figure out whether it's a modeset driver. It only does | |
902 | * readdir, hence a symlink is sufficient (and the least confusing | |
903 | * option). Otherwise controlD* is entirely unused. | |
904 | * | |
905 | * Old controlD chardev have been allocated in the range | |
906 | * 64-127. | |
907 | */ | |
908 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); | |
909 | if (!name) | |
910 | return -ENOMEM; | |
911 | ||
912 | ret = sysfs_create_link(minor->kdev->kobj.parent, | |
913 | &minor->kdev->kobj, | |
914 | name); | |
915 | ||
916 | kfree(name); | |
917 | ||
918 | return ret; | |
919 | } | |
920 | ||
921 | static void remove_compat_control_link(struct drm_device *dev) | |
922 | { | |
923 | struct drm_minor *minor; | |
924 | char *name; | |
925 | ||
926 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
927 | return; | |
928 | ||
929 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
930 | if (!minor) | |
931 | return; | |
932 | ||
7f6df440 | 933 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
6449b088 DV |
934 | if (!name) |
935 | return; | |
936 | ||
937 | sysfs_remove_link(minor->kdev->kobj.parent, name); | |
938 | ||
939 | kfree(name); | |
940 | } | |
941 | ||
c22f0ace DH |
942 | /** |
943 | * drm_dev_register - Register DRM device | |
944 | * @dev: Device to register | |
c6a1af8a | 945 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
946 | * |
947 | * Register the DRM device @dev with the system, advertise device to user-space | |
33e70110 | 948 | * and start normal device operation. @dev must be initialized via drm_dev_init() |
e28cd4d0 | 949 | * previously. |
c22f0ace DH |
950 | * |
951 | * Never call this twice on any device! | |
952 | * | |
6e3f797c | 953 | * NOTE: To ensure backward compatibility with existing drivers method this |
ef40cbf9 DV |
954 | * function calls the &drm_driver.load method after registering the device |
955 | * nodes, creating race conditions. Usage of the &drm_driver.load methods is | |
956 | * therefore deprecated, drivers must perform all initialization before calling | |
6e3f797c DV |
957 | * drm_dev_register(). |
958 | * | |
c22f0ace DH |
959 | * RETURNS: |
960 | * 0 on success, negative error code on failure. | |
961 | */ | |
962 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
963 | { | |
75f6dfe3 | 964 | struct drm_driver *driver = dev->driver; |
c22f0ace DH |
965 | int ret; |
966 | ||
967 | mutex_lock(&drm_global_mutex); | |
968 | ||
afcdbc86 | 969 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
970 | if (ret) |
971 | goto err_minors; | |
c22f0ace | 972 | |
a3ccc461 | 973 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 974 | if (ret) |
05b701f6 | 975 | goto err_minors; |
c22f0ace | 976 | |
6449b088 DV |
977 | ret = create_compat_control_link(dev); |
978 | if (ret) | |
979 | goto err_minors; | |
980 | ||
e6e7b48b DV |
981 | dev->registered = true; |
982 | ||
c22f0ace DH |
983 | if (dev->driver->load) { |
984 | ret = dev->driver->load(dev, flags); | |
985 | if (ret) | |
05b701f6 | 986 | goto err_minors; |
c22f0ace DH |
987 | } |
988 | ||
bee7fb15 | 989 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 990 | drm_modeset_register_all(dev); |
e28cd4d0 | 991 | |
c22f0ace | 992 | ret = 0; |
75f6dfe3 GKB |
993 | |
994 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", | |
995 | driver->name, driver->major, driver->minor, | |
6098909c CW |
996 | driver->patchlevel, driver->date, |
997 | dev->dev ? dev_name(dev->dev) : "virtual device", | |
75f6dfe3 GKB |
998 | dev->primary->index); |
999 | ||
c22f0ace DH |
1000 | goto out_unlock; |
1001 | ||
05b701f6 | 1002 | err_minors: |
6449b088 | 1003 | remove_compat_control_link(dev); |
a3ccc461 | 1004 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 1005 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c22f0ace DH |
1006 | out_unlock: |
1007 | mutex_unlock(&drm_global_mutex); | |
1008 | return ret; | |
1009 | } | |
1010 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
1011 | |
1012 | /** | |
1013 | * drm_dev_unregister - Unregister DRM device | |
1014 | * @dev: Device to unregister | |
1015 | * | |
1016 | * Unregister the DRM device from the system. This does the reverse of | |
1017 | * drm_dev_register() but does not deallocate the device. The caller must call | |
9a96f550 | 1018 | * drm_dev_put() to drop their final reference. |
6e3f797c | 1019 | * |
c07dcd61 DV |
1020 | * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), |
1021 | * which can be called while there are still open users of @dev. | |
1022 | * | |
6e3f797c DV |
1023 | * This should be called first in the device teardown code to make sure |
1024 | * userspace can't access the device instance any more. | |
c3a49737 DH |
1025 | */ |
1026 | void drm_dev_unregister(struct drm_device *dev) | |
1027 | { | |
2e45eeac DV |
1028 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
1029 | drm_lastclose(dev); | |
c3a49737 | 1030 | |
e6e7b48b DV |
1031 | dev->registered = false; |
1032 | ||
c76f0f7c NT |
1033 | drm_client_dev_unregister(dev); |
1034 | ||
bee7fb15 | 1035 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 1036 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 1037 | |
c3a49737 DH |
1038 | if (dev->driver->unload) |
1039 | dev->driver->unload(dev); | |
1040 | ||
4efafebe DV |
1041 | if (dev->agp) |
1042 | drm_pci_agp_destroy(dev); | |
c3a49737 | 1043 | |
35a28021 | 1044 | drm_legacy_rmmaps(dev); |
c3a49737 | 1045 | |
6449b088 | 1046 | remove_compat_control_link(dev); |
a3ccc461 | 1047 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 1048 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c3a49737 DH |
1049 | } |
1050 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 1051 | |
a6b5fac5 GH |
1052 | /** |
1053 | * drm_dev_set_unique - Set the unique name of a DRM device | |
1054 | * @dev: device of which to set the unique name | |
1055 | * @name: unique name | |
1056 | * | |
33e70110 DV |
1057 | * Sets the unique name of a DRM device using the specified string. This is |
1058 | * already done by drm_dev_init(), drivers should only override the default | |
1059 | * unique name for backwards compatibility reasons. | |
a6b5fac5 GH |
1060 | * |
1061 | * Return: 0 on success or a negative error code on failure. | |
1062 | */ | |
1063 | int drm_dev_set_unique(struct drm_device *dev, const char *name) | |
1064 | { | |
1065 | kfree(dev->unique); | |
1066 | dev->unique = kstrdup(name, GFP_KERNEL); | |
1067 | ||
1068 | return dev->unique ? 0 : -ENOMEM; | |
1069 | } | |
1070 | EXPORT_SYMBOL(drm_dev_set_unique); | |
1071 | ||
1b7199fe DH |
1072 | /* |
1073 | * DRM Core | |
1074 | * The DRM core module initializes all global DRM objects and makes them | |
1075 | * available to drivers. Once setup, drivers can probe their respective | |
1076 | * devices. | |
1077 | * Currently, core management includes: | |
1078 | * - The "DRM-Global" key/value database | |
1079 | * - Global ID management for connectors | |
1080 | * - DRM major number allocation | |
1081 | * - DRM minor management | |
1082 | * - DRM sysfs class | |
1083 | * - DRM debugfs root | |
1084 | * | |
1085 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
1086 | * interface registered on a DRM device, you can request minor numbers from DRM | |
1087 | * core. DRM core takes care of major-number management and char-dev | |
1088 | * registration. A stub ->open() callback forwards any open() requests to the | |
1089 | * registered minor. | |
1090 | */ | |
1091 | ||
1092 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
1093 | { | |
1094 | const struct file_operations *new_fops; | |
1095 | struct drm_minor *minor; | |
1096 | int err; | |
1097 | ||
1098 | DRM_DEBUG("\n"); | |
1099 | ||
1100 | mutex_lock(&drm_global_mutex); | |
1101 | minor = drm_minor_acquire(iminor(inode)); | |
1102 | if (IS_ERR(minor)) { | |
1103 | err = PTR_ERR(minor); | |
1104 | goto out_unlock; | |
1105 | } | |
1106 | ||
1107 | new_fops = fops_get(minor->dev->driver->fops); | |
1108 | if (!new_fops) { | |
1109 | err = -ENODEV; | |
1110 | goto out_release; | |
1111 | } | |
1112 | ||
1113 | replace_fops(filp, new_fops); | |
1114 | if (filp->f_op->open) | |
1115 | err = filp->f_op->open(inode, filp); | |
1116 | else | |
1117 | err = 0; | |
1118 | ||
1119 | out_release: | |
1120 | drm_minor_release(minor); | |
1121 | out_unlock: | |
1122 | mutex_unlock(&drm_global_mutex); | |
1123 | return err; | |
1124 | } | |
1125 | ||
1126 | static const struct file_operations drm_stub_fops = { | |
1127 | .owner = THIS_MODULE, | |
1128 | .open = drm_stub_open, | |
1129 | .llseek = noop_llseek, | |
1130 | }; | |
1131 | ||
2cc107dc DH |
1132 | static void drm_core_exit(void) |
1133 | { | |
1134 | unregister_chrdev(DRM_MAJOR, "drm"); | |
1135 | debugfs_remove(drm_debugfs_root); | |
1136 | drm_sysfs_destroy(); | |
1137 | idr_destroy(&drm_minors_idr); | |
1138 | drm_connector_ida_destroy(); | |
2cc107dc DH |
1139 | } |
1140 | ||
1b7199fe DH |
1141 | static int __init drm_core_init(void) |
1142 | { | |
2cc107dc | 1143 | int ret; |
1b7199fe | 1144 | |
1b7199fe DH |
1145 | drm_connector_ida_init(); |
1146 | idr_init(&drm_minors_idr); | |
1147 | ||
fcc90213 DH |
1148 | ret = drm_sysfs_init(); |
1149 | if (ret < 0) { | |
2cc107dc DH |
1150 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
1151 | goto error; | |
1b7199fe DH |
1152 | } |
1153 | ||
1154 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
1b7199fe | 1155 | |
2cc107dc DH |
1156 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
1157 | if (ret < 0) | |
1158 | goto error; | |
1159 | ||
371c2279 AM |
1160 | drm_core_init_complete = true; |
1161 | ||
e82dfa00 | 1162 | DRM_DEBUG("Initialized\n"); |
1b7199fe | 1163 | return 0; |
1b7199fe | 1164 | |
2cc107dc DH |
1165 | error: |
1166 | drm_core_exit(); | |
1b7199fe DH |
1167 | return ret; |
1168 | } | |
1169 | ||
1b7199fe DH |
1170 | module_init(drm_core_init); |
1171 | module_exit(drm_core_exit); |