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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 | |
7428ff70 | 38 | #include <drm/drm_accel.h> |
b7e32bef | 39 | #include <drm/drm_cache.h> |
c76f0f7c | 40 | #include <drm/drm_client.h> |
0500c04e | 41 | #include <drm/drm_color_mgmt.h> |
85e634bc | 42 | #include <drm/drm_drv.h> |
0500c04e | 43 | #include <drm/drm_file.h> |
6f365e56 | 44 | #include <drm/drm_managed.h> |
0500c04e | 45 | #include <drm/drm_mode_object.h> |
bf9fb17c | 46 | #include <drm/drm_panic.h> |
0500c04e | 47 | #include <drm/drm_print.h> |
a1a98689 | 48 | #include <drm/drm_privacy_screen_machine.h> |
85e634bc | 49 | |
79190ea2 | 50 | #include "drm_crtc_internal.h" |
67d0ec4e | 51 | #include "drm_internal.h" |
1da177e4 | 52 | |
82d5e73f DH |
53 | MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
54 | MODULE_DESCRIPTION("DRM shared core routines"); | |
1da177e4 | 55 | MODULE_LICENSE("GPL and additional rights"); |
1da177e4 | 56 | |
0d639883 | 57 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 58 | static struct idr drm_minors_idr; |
2c14f28b | 59 | |
371c2279 AM |
60 | /* |
61 | * If the drm core fails to init for whatever reason, | |
62 | * we should prevent any drivers from registering with it. | |
63 | * It's best to check this at drm_dev_init(), as some drivers | |
64 | * prefer to embed struct drm_device into their own device | |
65 | * structure and call drm_dev_init() themselves. | |
66 | */ | |
c00697b5 | 67 | static bool drm_core_init_complete; |
371c2279 | 68 | |
1b7199fe | 69 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 70 | |
bee330f3 NT |
71 | DEFINE_STATIC_SRCU(drm_unplug_srcu); |
72 | ||
0d639883 DH |
73 | /* |
74 | * DRM Minors | |
75 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
76 | * of them is represented by a drm_minor object. Depending on the capabilities | |
77 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 78 | * |
0d639883 DH |
79 | * Minors can be accessed via dev->$minor_name. This pointer is either |
80 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
81 | * valid. This means, DRM minors have the same life-time as the underlying | |
82 | * device. However, this doesn't mean that the minor is active. Minors are | |
83 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 84 | */ |
0d639883 | 85 | |
05b701f6 | 86 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
e48aedf7 | 87 | enum drm_minor_type type) |
05b701f6 DH |
88 | { |
89 | switch (type) { | |
a3ccc461 | 90 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
91 | return &dev->primary; |
92 | case DRM_MINOR_RENDER: | |
93 | return &dev->render; | |
7428ff70 OG |
94 | case DRM_MINOR_ACCEL: |
95 | return &dev->accel; | |
05b701f6 | 96 | default: |
3bd07ccd | 97 | BUG(); |
05b701f6 DH |
98 | } |
99 | } | |
100 | ||
f96306f9 DV |
101 | static void drm_minor_alloc_release(struct drm_device *dev, void *data) |
102 | { | |
103 | struct drm_minor *minor = data; | |
104 | unsigned long flags; | |
105 | ||
c3b790ea DV |
106 | WARN_ON(dev != minor->dev); |
107 | ||
f96306f9 DV |
108 | put_device(minor->kdev); |
109 | ||
7428ff70 OG |
110 | if (minor->type == DRM_MINOR_ACCEL) { |
111 | accel_minor_remove(minor->index); | |
112 | } else { | |
113 | spin_lock_irqsave(&drm_minor_lock, flags); | |
114 | idr_remove(&drm_minors_idr, minor->index); | |
115 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
116 | } | |
f96306f9 DV |
117 | } |
118 | ||
e48aedf7 | 119 | static int drm_minor_alloc(struct drm_device *dev, enum drm_minor_type type) |
05b701f6 DH |
120 | { |
121 | struct drm_minor *minor; | |
f1b85962 DH |
122 | unsigned long flags; |
123 | int r; | |
05b701f6 | 124 | |
f96306f9 | 125 | minor = drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL); |
05b701f6 DH |
126 | if (!minor) |
127 | return -ENOMEM; | |
128 | ||
129 | minor->type = type; | |
130 | minor->dev = dev; | |
05b701f6 | 131 | |
f1b85962 | 132 | idr_preload(GFP_KERNEL); |
7428ff70 OG |
133 | if (type == DRM_MINOR_ACCEL) { |
134 | r = accel_minor_alloc(); | |
135 | } else { | |
136 | spin_lock_irqsave(&drm_minor_lock, flags); | |
137 | r = idr_alloc(&drm_minors_idr, | |
138 | NULL, | |
139 | 64 * type, | |
140 | 64 * (type + 1), | |
141 | GFP_NOWAIT); | |
142 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
143 | } | |
f1b85962 DH |
144 | idr_preload_end(); |
145 | ||
146 | if (r < 0) | |
f96306f9 | 147 | return r; |
f1b85962 DH |
148 | |
149 | minor->index = r; | |
150 | ||
f96306f9 DV |
151 | r = drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor); |
152 | if (r) | |
153 | return r; | |
154 | ||
e1728075 | 155 | minor->kdev = drm_sysfs_minor_alloc(minor); |
f96306f9 DV |
156 | if (IS_ERR(minor->kdev)) |
157 | return PTR_ERR(minor->kdev); | |
e1728075 | 158 | |
05b701f6 DH |
159 | *drm_minor_get_slot(dev, type) = minor; |
160 | return 0; | |
bd9dfa98 DH |
161 | } |
162 | ||
e48aedf7 | 163 | static int drm_minor_register(struct drm_device *dev, enum drm_minor_type type) |
1da177e4 | 164 | { |
f1b85962 | 165 | struct drm_minor *minor; |
0d639883 | 166 | unsigned long flags; |
1da177e4 | 167 | int ret; |
1da177e4 LT |
168 | |
169 | DRM_DEBUG("\n"); | |
170 | ||
f1b85962 DH |
171 | minor = *drm_minor_get_slot(dev, type); |
172 | if (!minor) | |
05b701f6 DH |
173 | return 0; |
174 | ||
0b30d57a CK |
175 | if (minor->type != DRM_MINOR_ACCEL) { |
176 | ret = drm_debugfs_register(minor, minor->index, | |
177 | drm_debugfs_root); | |
7428ff70 OG |
178 | if (ret) { |
179 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); | |
180 | goto err_debugfs; | |
181 | } | |
955b12de | 182 | } |
2c14f28b | 183 | |
e1728075 DH |
184 | ret = device_add(minor->kdev); |
185 | if (ret) | |
cb6458f9 | 186 | goto err_debugfs; |
2c14f28b | 187 | |
0d639883 | 188 | /* replace NULL with @minor so lookups will succeed from now on */ |
7428ff70 OG |
189 | if (minor->type == DRM_MINOR_ACCEL) { |
190 | accel_minor_replace(minor, minor->index); | |
191 | } else { | |
192 | spin_lock_irqsave(&drm_minor_lock, flags); | |
193 | idr_replace(&drm_minors_idr, minor, minor->index); | |
194 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
195 | } | |
2c14f28b | 196 | |
f1b85962 | 197 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
198 | return 0; |
199 | ||
cb6458f9 | 200 | err_debugfs: |
8e455145 | 201 | drm_debugfs_unregister(minor); |
1da177e4 LT |
202 | return ret; |
203 | } | |
b5e89ed5 | 204 | |
e48aedf7 | 205 | static void drm_minor_unregister(struct drm_device *dev, enum drm_minor_type type) |
f73aca50 | 206 | { |
afcdbc86 | 207 | struct drm_minor *minor; |
0d639883 | 208 | unsigned long flags; |
afcdbc86 DH |
209 | |
210 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 211 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
212 | return; |
213 | ||
f1b85962 | 214 | /* replace @minor with NULL so lookups will fail from now on */ |
7428ff70 OG |
215 | if (minor->type == DRM_MINOR_ACCEL) { |
216 | accel_minor_replace(NULL, minor->index); | |
217 | } else { | |
218 | spin_lock_irqsave(&drm_minor_lock, flags); | |
219 | idr_replace(&drm_minors_idr, NULL, minor->index); | |
220 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
221 | } | |
865fb47f | 222 | |
e1728075 DH |
223 | device_del(minor->kdev); |
224 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
8e455145 | 225 | drm_debugfs_unregister(minor); |
f73aca50 DH |
226 | } |
227 | ||
85e634bc | 228 | /* |
1616c525 DH |
229 | * Looks up the given minor-ID and returns the respective DRM-minor object. The |
230 | * refence-count of the underlying device is increased so you must release this | |
231 | * object with drm_minor_release(). | |
232 | * | |
233 | * As long as you hold this minor, it is guaranteed that the object and the | |
234 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
235 | * unregistered while you hold the minor. | |
1da177e4 | 236 | */ |
1616c525 | 237 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 238 | { |
1616c525 | 239 | struct drm_minor *minor; |
0d639883 | 240 | unsigned long flags; |
1616c525 | 241 | |
0d639883 | 242 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 243 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 | 244 | if (minor) |
9a96f550 | 245 | drm_dev_get(minor->dev); |
0d639883 DH |
246 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
247 | ||
248 | if (!minor) { | |
249 | return ERR_PTR(-ENODEV); | |
c07dcd61 | 250 | } else if (drm_dev_is_unplugged(minor->dev)) { |
9a96f550 | 251 | drm_dev_put(minor->dev); |
1616c525 | 252 | return ERR_PTR(-ENODEV); |
0d639883 | 253 | } |
673a394b | 254 | |
1616c525 DH |
255 | return minor; |
256 | } | |
b5e89ed5 | 257 | |
1616c525 DH |
258 | void drm_minor_release(struct drm_minor *minor) |
259 | { | |
9a96f550 | 260 | drm_dev_put(minor->dev); |
1da177e4 | 261 | } |
112b715e | 262 | |
6e3f797c DV |
263 | /** |
264 | * DOC: driver instance overview | |
265 | * | |
ea0dd85a | 266 | * A device instance for a drm driver is represented by &struct drm_device. This |
4c8e84b8 DV |
267 | * is allocated and initialized with devm_drm_dev_alloc(), usually from |
268 | * bus-specific ->probe() callbacks implemented by the driver. The driver then | |
269 | * needs to initialize all the various subsystems for the drm device like memory | |
270 | * management, vblank handling, modesetting support and initial output | |
271 | * configuration plus obviously initialize all the corresponding hardware bits. | |
272 | * Finally when everything is up and running and ready for userspace the device | |
273 | * instance can be published using drm_dev_register(). | |
6e3f797c | 274 | * |
0ae865ef | 275 | * There is also deprecated support for initializing device instances using |
ef40cbf9 | 276 | * bus-specific helpers and the &drm_driver.load callback. But due to |
6e3f797c DV |
277 | * backwards-compatibility needs the device instance have to be published too |
278 | * early, which requires unpretty global locking to make safe and is therefore | |
279 | * only support for existing drivers not yet converted to the new scheme. | |
280 | * | |
281 | * When cleaning up a device instance everything needs to be done in reverse: | |
282 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
283 | * any other resources allocated at device initialization and drop the driver's | |
9a96f550 | 284 | * reference to &drm_device using drm_dev_put(). |
6e3f797c | 285 | * |
9e1ed9fb DV |
286 | * Note that any allocation or resource which is visible to userspace must be |
287 | * released only when the final drm_dev_put() is called, and not when the | |
288 | * driver is unbound from the underlying physical struct &device. Best to use | |
289 | * &drm_device managed resources with drmm_add_action(), drmm_kmalloc() and | |
290 | * related functions. | |
291 | * | |
292 | * devres managed resources like devm_kmalloc() can only be used for resources | |
293 | * directly related to the underlying hardware device, and only used in code | |
294 | * paths fully protected by drm_dev_enter() and drm_dev_exit(). | |
de99f060 NT |
295 | * |
296 | * Display driver example | |
297 | * ~~~~~~~~~~~~~~~~~~~~~~ | |
298 | * | |
299 | * The following example shows a typical structure of a DRM display driver. | |
300 | * The example focus on the probe() function and the other functions that is | |
4c8e84b8 | 301 | * almost always present and serves as a demonstration of devm_drm_dev_alloc(). |
de99f060 NT |
302 | * |
303 | * .. code-block:: c | |
304 | * | |
305 | * struct driver_device { | |
306 | * struct drm_device drm; | |
307 | * void *userspace_facing; | |
308 | * struct clk *pclk; | |
309 | * }; | |
310 | * | |
8f5c7aa0 | 311 | * static const struct drm_driver driver_drm_driver = { |
de99f060 | 312 | * [...] |
de99f060 NT |
313 | * }; |
314 | * | |
315 | * static int driver_probe(struct platform_device *pdev) | |
316 | * { | |
317 | * struct driver_device *priv; | |
318 | * struct drm_device *drm; | |
319 | * int ret; | |
320 | * | |
4c8e84b8 DV |
321 | * priv = devm_drm_dev_alloc(&pdev->dev, &driver_drm_driver, |
322 | * struct driver_device, drm); | |
323 | * if (IS_ERR(priv)) | |
324 | * return PTR_ERR(priv); | |
de99f060 NT |
325 | * drm = &priv->drm; |
326 | * | |
c3b790ea DV |
327 | * ret = drmm_mode_config_init(drm); |
328 | * if (ret) | |
329 | * return ret; | |
de99f060 | 330 | * |
5dad34f3 | 331 | * priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL); |
de99f060 NT |
332 | * if (!priv->userspace_facing) |
333 | * return -ENOMEM; | |
334 | * | |
335 | * priv->pclk = devm_clk_get(dev, "PCLK"); | |
336 | * if (IS_ERR(priv->pclk)) | |
337 | * return PTR_ERR(priv->pclk); | |
338 | * | |
56d8d641 | 339 | * // Further setup, display pipeline etc |
de99f060 NT |
340 | * |
341 | * platform_set_drvdata(pdev, drm); | |
342 | * | |
343 | * drm_mode_config_reset(drm); | |
344 | * | |
345 | * ret = drm_dev_register(drm); | |
346 | * if (ret) | |
347 | * return ret; | |
348 | * | |
349 | * drm_fbdev_generic_setup(drm, 32); | |
350 | * | |
351 | * return 0; | |
352 | * } | |
353 | * | |
56d8d641 | 354 | * // This function is called before the devm_ resources are released |
de99f060 NT |
355 | * static int driver_remove(struct platform_device *pdev) |
356 | * { | |
357 | * struct drm_device *drm = platform_get_drvdata(pdev); | |
358 | * | |
359 | * drm_dev_unregister(drm); | |
360 | * drm_atomic_helper_shutdown(drm) | |
361 | * | |
362 | * return 0; | |
363 | * } | |
364 | * | |
56d8d641 | 365 | * // This function is called on kernel restart and shutdown |
de99f060 NT |
366 | * static void driver_shutdown(struct platform_device *pdev) |
367 | * { | |
368 | * drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); | |
369 | * } | |
370 | * | |
371 | * static int __maybe_unused driver_pm_suspend(struct device *dev) | |
372 | * { | |
373 | * return drm_mode_config_helper_suspend(dev_get_drvdata(dev)); | |
374 | * } | |
375 | * | |
376 | * static int __maybe_unused driver_pm_resume(struct device *dev) | |
377 | * { | |
378 | * drm_mode_config_helper_resume(dev_get_drvdata(dev)); | |
379 | * | |
380 | * return 0; | |
381 | * } | |
382 | * | |
383 | * static const struct dev_pm_ops driver_pm_ops = { | |
384 | * SET_SYSTEM_SLEEP_PM_OPS(driver_pm_suspend, driver_pm_resume) | |
385 | * }; | |
386 | * | |
387 | * static struct platform_driver driver_driver = { | |
388 | * .driver = { | |
389 | * [...] | |
390 | * .pm = &driver_pm_ops, | |
391 | * }, | |
392 | * .probe = driver_probe, | |
393 | * .remove = driver_remove, | |
394 | * .shutdown = driver_shutdown, | |
395 | * }; | |
396 | * module_platform_driver(driver_driver); | |
397 | * | |
398 | * Drivers that want to support device unplugging (USB, DT overlay unload) should | |
399 | * use drm_dev_unplug() instead of drm_dev_unregister(). The driver must protect | |
400 | * regions that is accessing device resources to prevent use after they're | |
401 | * released. This is done using drm_dev_enter() and drm_dev_exit(). There is one | |
402 | * shortcoming however, drm_dev_unplug() marks the drm_device as unplugged before | |
403 | * drm_atomic_helper_shutdown() is called. This means that if the disable code | |
404 | * paths are protected, they will not run on regular driver module unload, | |
0ae865ef | 405 | * possibly leaving the hardware enabled. |
6e3f797c DV |
406 | */ |
407 | ||
112b715e | 408 | /** |
c6a1af8a TR |
409 | * drm_put_dev - Unregister and release a DRM device |
410 | * @dev: DRM device | |
112b715e | 411 | * |
c6a1af8a | 412 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 413 | * |
c6a1af8a | 414 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
415 | * |
416 | * Note: Use of this function is deprecated. It will eventually go away | |
9a96f550 | 417 | * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly |
6e3f797c DV |
418 | * instead to make sure that the device isn't userspace accessible any more |
419 | * while teardown is in progress, ensuring that userspace can't access an | |
420 | * inconsistent state. | |
112b715e KH |
421 | */ |
422 | void drm_put_dev(struct drm_device *dev) | |
423 | { | |
112b715e KH |
424 | DRM_DEBUG("\n"); |
425 | ||
426 | if (!dev) { | |
427 | DRM_ERROR("cleanup called no dev\n"); | |
428 | return; | |
429 | } | |
430 | ||
c3a49737 | 431 | drm_dev_unregister(dev); |
9a96f550 | 432 | drm_dev_put(dev); |
112b715e KH |
433 | } |
434 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d | 435 | |
bee330f3 NT |
436 | /** |
437 | * drm_dev_enter - Enter device critical section | |
438 | * @dev: DRM device | |
439 | * @idx: Pointer to index that will be passed to the matching drm_dev_exit() | |
440 | * | |
441 | * This function marks and protects the beginning of a section that should not | |
442 | * be entered after the device has been unplugged. The section end is marked | |
443 | * with drm_dev_exit(). Calls to this function can be nested. | |
444 | * | |
445 | * Returns: | |
446 | * True if it is OK to enter the section, false otherwise. | |
447 | */ | |
448 | bool drm_dev_enter(struct drm_device *dev, int *idx) | |
c07dcd61 | 449 | { |
bee330f3 NT |
450 | *idx = srcu_read_lock(&drm_unplug_srcu); |
451 | ||
452 | if (dev->unplugged) { | |
453 | srcu_read_unlock(&drm_unplug_srcu, *idx); | |
454 | return false; | |
455 | } | |
456 | ||
457 | return true; | |
c07dcd61 | 458 | } |
bee330f3 NT |
459 | EXPORT_SYMBOL(drm_dev_enter); |
460 | ||
461 | /** | |
462 | * drm_dev_exit - Exit device critical section | |
463 | * @idx: index returned from drm_dev_enter() | |
464 | * | |
465 | * This function marks the end of a section that should not be entered after | |
466 | * the device has been unplugged. | |
467 | */ | |
468 | void drm_dev_exit(int idx) | |
c07dcd61 | 469 | { |
bee330f3 | 470 | srcu_read_unlock(&drm_unplug_srcu, idx); |
c07dcd61 | 471 | } |
bee330f3 | 472 | EXPORT_SYMBOL(drm_dev_exit); |
c07dcd61 DV |
473 | |
474 | /** | |
475 | * drm_dev_unplug - unplug a DRM device | |
476 | * @dev: DRM device | |
477 | * | |
478 | * This unplugs a hotpluggable DRM device, which makes it inaccessible to | |
bee330f3 NT |
479 | * userspace operations. Entry-points can use drm_dev_enter() and |
480 | * drm_dev_exit() to protect device resources in a race free manner. This | |
c07dcd61 DV |
481 | * essentially unregisters the device like drm_dev_unregister(), but can be |
482 | * called while there are still open users of @dev. | |
483 | */ | |
484 | void drm_dev_unplug(struct drm_device *dev) | |
2c07a21d | 485 | { |
bee330f3 NT |
486 | /* |
487 | * After synchronizing any critical read section is guaranteed to see | |
488 | * the new value of ->unplugged, and any critical section which might | |
489 | * still have seen the old value of ->unplugged is guaranteed to have | |
490 | * finished. | |
491 | */ | |
492 | dev->unplugged = true; | |
493 | synchronize_srcu(&drm_unplug_srcu); | |
069035c5 OA |
494 | |
495 | drm_dev_unregister(dev); | |
b9d4efa8 AG |
496 | |
497 | /* Clear all CPU mappings pointing to this device */ | |
498 | unmap_mapping_range(dev->anon_inode->i_mapping, 0, 0, 1); | |
2c07a21d | 499 | } |
c07dcd61 | 500 | EXPORT_SYMBOL(drm_dev_unplug); |
1bb72532 | 501 | |
31bbe16f DH |
502 | /* |
503 | * DRM internal mount | |
504 | * We want to be able to allocate our own "struct address_space" to control | |
505 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
506 | * stand-alone address_space objects, so we need an underlying inode. As there | |
507 | * is no way to allocate an independent inode easily, we need a fake internal | |
508 | * VFS mount-point. | |
509 | * | |
510 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
511 | * frees it again. You are allowed to use iget() and iput() to get references to | |
512 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
513 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
514 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
515 | * between multiple inode-users. You could, technically, call | |
516 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
517 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
518 | */ | |
519 | ||
520 | static int drm_fs_cnt; | |
521 | static struct vfsmount *drm_fs_mnt; | |
522 | ||
4a457910 | 523 | static int drm_fs_init_fs_context(struct fs_context *fc) |
31bbe16f | 524 | { |
4a457910 | 525 | return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM; |
31bbe16f DH |
526 | } |
527 | ||
528 | static struct file_system_type drm_fs_type = { | |
529 | .name = "drm", | |
530 | .owner = THIS_MODULE, | |
4a457910 | 531 | .init_fs_context = drm_fs_init_fs_context, |
31bbe16f DH |
532 | .kill_sb = kill_anon_super, |
533 | }; | |
534 | ||
535 | static struct inode *drm_fs_inode_new(void) | |
536 | { | |
537 | struct inode *inode; | |
538 | int r; | |
539 | ||
540 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
541 | if (r < 0) { | |
542 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
543 | return ERR_PTR(r); | |
544 | } | |
545 | ||
546 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
547 | if (IS_ERR(inode)) | |
548 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
549 | ||
550 | return inode; | |
551 | } | |
552 | ||
553 | static void drm_fs_inode_free(struct inode *inode) | |
554 | { | |
555 | if (inode) { | |
556 | iput(inode); | |
557 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
558 | } | |
559 | } | |
560 | ||
86ab67df DV |
561 | /** |
562 | * DOC: component helper usage recommendations | |
563 | * | |
564 | * DRM drivers that drive hardware where a logical device consists of a pile of | |
565 | * independent hardware blocks are recommended to use the :ref:`component helper | |
566 | * library<component>`. For consistency and better options for code reuse the | |
567 | * following guidelines apply: | |
568 | * | |
569 | * - The entire device initialization procedure should be run from the | |
4c8e84b8 DV |
570 | * &component_master_ops.master_bind callback, starting with |
571 | * devm_drm_dev_alloc(), then binding all components with | |
572 | * component_bind_all() and finishing with drm_dev_register(). | |
86ab67df DV |
573 | * |
574 | * - The opaque pointer passed to all components through component_bind_all() | |
575 | * should point at &struct drm_device of the device instance, not some driver | |
576 | * specific private structure. | |
577 | * | |
578 | * - The component helper fills the niche where further standardization of | |
579 | * interfaces is not practical. When there already is, or will be, a | |
580 | * standardized interface like &drm_bridge or &drm_panel, providing its own | |
581 | * functions to find such components at driver load time, like | |
582 | * drm_of_find_panel_or_bridge(), then the component helper should not be | |
583 | * used. | |
584 | */ | |
585 | ||
2cbf7fc6 DV |
586 | static void drm_dev_init_release(struct drm_device *dev, void *res) |
587 | { | |
2cbf7fc6 DV |
588 | drm_fs_inode_free(dev->anon_inode); |
589 | ||
590 | put_device(dev->dev); | |
591 | /* Prevent use-after-free in drm_managed_release when debugging is | |
592 | * enabled. Slightly awkward, but can't really be helped. */ | |
593 | dev->dev = NULL; | |
594 | mutex_destroy(&dev->master_mutex); | |
595 | mutex_destroy(&dev->clientlist_mutex); | |
596 | mutex_destroy(&dev->filelist_mutex); | |
597 | mutex_destroy(&dev->struct_mutex); | |
2cbf7fc6 DV |
598 | } |
599 | ||
a7d39439 | 600 | static int drm_dev_init(struct drm_device *dev, |
8f5c7aa0 | 601 | const struct drm_driver *driver, |
a7d39439 | 602 | struct device *parent) |
1bb72532 | 603 | { |
acf20ed0 | 604 | struct inode *inode; |
1bb72532 DH |
605 | int ret; |
606 | ||
371c2279 AM |
607 | if (!drm_core_init_complete) { |
608 | DRM_ERROR("DRM core is not initialized\n"); | |
609 | return -ENODEV; | |
610 | } | |
611 | ||
8b6fc114 AP |
612 | if (WARN_ON(!parent)) |
613 | return -EINVAL; | |
f08877e7 | 614 | |
099d1c29 | 615 | kref_init(&dev->ref); |
56be6503 | 616 | dev->dev = get_device(parent); |
1bb72532 DH |
617 | dev->driver = driver; |
618 | ||
c6603c74 DV |
619 | INIT_LIST_HEAD(&dev->managed.resources); |
620 | spin_lock_init(&dev->managed.lock); | |
621 | ||
18ace11f VS |
622 | /* no per-device feature limits by default */ |
623 | dev->driver_features = ~0u; | |
624 | ||
7428ff70 OG |
625 | if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL) && |
626 | (drm_core_check_feature(dev, DRIVER_RENDER) || | |
627 | drm_core_check_feature(dev, DRIVER_MODESET))) { | |
628 | DRM_ERROR("DRM driver can't be both a compute acceleration and graphics driver\n"); | |
629 | return -EINVAL; | |
630 | } | |
631 | ||
1bb72532 | 632 | INIT_LIST_HEAD(&dev->filelist); |
c76f0f7c NT |
633 | INIT_LIST_HEAD(&dev->filelist_internal); |
634 | INIT_LIST_HEAD(&dev->clientlist); | |
1bb72532 DH |
635 | INIT_LIST_HEAD(&dev->vblank_event_list); |
636 | ||
1bb72532 DH |
637 | spin_lock_init(&dev->event_lock); |
638 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 639 | mutex_init(&dev->filelist_mutex); |
c76f0f7c | 640 | mutex_init(&dev->clientlist_mutex); |
c996fd0b | 641 | mutex_init(&dev->master_mutex); |
e2a1cda3 | 642 | raw_spin_lock_init(&dev->mode_config.panic_lock); |
1bb72532 | 643 | |
ff963634 | 644 | ret = drmm_add_action_or_reset(dev, drm_dev_init_release, NULL); |
2cbf7fc6 DV |
645 | if (ret) |
646 | return ret; | |
647 | ||
acf20ed0 WH |
648 | inode = drm_fs_inode_new(); |
649 | if (IS_ERR(inode)) { | |
650 | ret = PTR_ERR(inode); | |
6796cb16 | 651 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); |
2cbf7fc6 | 652 | goto err; |
6796cb16 DH |
653 | } |
654 | ||
acf20ed0 WH |
655 | dev->anon_inode = inode; |
656 | ||
7428ff70 OG |
657 | if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) { |
658 | ret = drm_minor_alloc(dev, DRM_MINOR_ACCEL); | |
05b701f6 | 659 | if (ret) |
f96306f9 | 660 | goto err; |
7428ff70 OG |
661 | } else { |
662 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { | |
663 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); | |
664 | if (ret) | |
665 | goto err; | |
666 | } | |
05b701f6 | 667 | |
7428ff70 OG |
668 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
669 | if (ret) | |
670 | goto err; | |
671 | } | |
05b701f6 | 672 | |
1bcecfac | 673 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
674 | ret = drm_gem_init(dev); |
675 | if (ret) { | |
676 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
f96306f9 | 677 | goto err; |
1bb72532 DH |
678 | } |
679 | } | |
680 | ||
5519fea9 CK |
681 | dev->unique = drmm_kstrdup(dev, dev_name(parent), GFP_KERNEL); |
682 | if (!dev->unique) { | |
683 | ret = -ENOMEM; | |
641b9103 | 684 | goto err; |
5519fea9 | 685 | } |
e112e593 | 686 | |
0b30d57a CK |
687 | if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) |
688 | accel_debugfs_init(dev); | |
689 | else | |
690 | drm_debugfs_dev_init(dev, drm_debugfs_root); | |
691 | ||
b209aca3 | 692 | return 0; |
1bb72532 | 693 | |
2cbf7fc6 DV |
694 | err: |
695 | drm_managed_release(dev); | |
696 | ||
b209aca3 CW |
697 | return ret; |
698 | } | |
b209aca3 | 699 | |
9b1f1b6b NT |
700 | static void devm_drm_dev_init_release(void *data) |
701 | { | |
702 | drm_dev_put(data); | |
703 | } | |
704 | ||
4c8e84b8 DV |
705 | static int devm_drm_dev_init(struct device *parent, |
706 | struct drm_device *dev, | |
8f5c7aa0 | 707 | const struct drm_driver *driver) |
9b1f1b6b NT |
708 | { |
709 | int ret; | |
710 | ||
9b1f1b6b NT |
711 | ret = drm_dev_init(dev, driver, parent); |
712 | if (ret) | |
713 | return ret; | |
714 | ||
13283a24 TT |
715 | return devm_add_action_or_reset(parent, |
716 | devm_drm_dev_init_release, dev); | |
9b1f1b6b | 717 | } |
9b1f1b6b | 718 | |
8f5c7aa0 DV |
719 | void *__devm_drm_dev_alloc(struct device *parent, |
720 | const struct drm_driver *driver, | |
b0b5849e DV |
721 | size_t size, size_t offset) |
722 | { | |
723 | void *container; | |
724 | struct drm_device *drm; | |
725 | int ret; | |
726 | ||
727 | container = kzalloc(size, GFP_KERNEL); | |
728 | if (!container) | |
729 | return ERR_PTR(-ENOMEM); | |
730 | ||
731 | drm = container + offset; | |
732 | ret = devm_drm_dev_init(parent, drm, driver); | |
733 | if (ret) { | |
734 | kfree(container); | |
735 | return ERR_PTR(ret); | |
736 | } | |
737 | drmm_add_final_kfree(drm, container); | |
738 | ||
739 | return container; | |
740 | } | |
741 | EXPORT_SYMBOL(__devm_drm_dev_alloc); | |
742 | ||
b209aca3 CW |
743 | /** |
744 | * drm_dev_alloc - Allocate new DRM device | |
745 | * @driver: DRM driver to allocate device for | |
746 | * @parent: Parent device object | |
747 | * | |
4c8e84b8 DV |
748 | * This is the deprecated version of devm_drm_dev_alloc(), which does not support |
749 | * subclassing through embedding the struct &drm_device in a driver private | |
750 | * structure, and which does not support automatic cleanup through devres. | |
b209aca3 CW |
751 | * |
752 | * RETURNS: | |
0f288605 | 753 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 | 754 | */ |
8f5c7aa0 | 755 | struct drm_device *drm_dev_alloc(const struct drm_driver *driver, |
b209aca3 CW |
756 | struct device *parent) |
757 | { | |
758 | struct drm_device *dev; | |
759 | int ret; | |
760 | ||
761 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
762 | if (!dev) | |
0f288605 | 763 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
764 | |
765 | ret = drm_dev_init(dev, driver, parent); | |
766 | if (ret) { | |
767 | kfree(dev); | |
0f288605 | 768 | return ERR_PTR(ret); |
b209aca3 CW |
769 | } |
770 | ||
6f365e56 DV |
771 | drmm_add_final_kfree(dev, dev); |
772 | ||
b209aca3 | 773 | return dev; |
1bb72532 DH |
774 | } |
775 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 776 | |
099d1c29 | 777 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 778 | { |
099d1c29 | 779 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 780 | |
0b30d57a CK |
781 | /* Just in case register/unregister was never called */ |
782 | drm_debugfs_dev_fini(dev); | |
783 | ||
c6603c74 | 784 | if (dev->driver->release) |
f30c9257 | 785 | dev->driver->release(dev); |
c6603c74 DV |
786 | |
787 | drm_managed_release(dev); | |
788 | ||
175233f9 | 789 | kfree(dev->managed.final_kfree); |
0dc8fe59 | 790 | } |
099d1c29 DH |
791 | |
792 | /** | |
9a96f550 | 793 | * drm_dev_get - Take reference of a DRM device |
099d1c29 DH |
794 | * @dev: device to take reference of or NULL |
795 | * | |
796 | * This increases the ref-count of @dev by one. You *must* already own a | |
9a96f550 | 797 | * reference when calling this. Use drm_dev_put() to drop this reference |
099d1c29 DH |
798 | * again. |
799 | * | |
800 | * This function never fails. However, this function does not provide *any* | |
801 | * guarantee whether the device is alive or running. It only provides a | |
802 | * reference to the object and the memory associated with it. | |
803 | */ | |
9a96f550 | 804 | void drm_dev_get(struct drm_device *dev) |
099d1c29 DH |
805 | { |
806 | if (dev) | |
807 | kref_get(&dev->ref); | |
808 | } | |
9a96f550 | 809 | EXPORT_SYMBOL(drm_dev_get); |
099d1c29 DH |
810 | |
811 | /** | |
9a96f550 | 812 | * drm_dev_put - Drop reference of a DRM device |
099d1c29 DH |
813 | * @dev: device to drop reference of or NULL |
814 | * | |
815 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
816 | * ref-count drops to zero. | |
817 | */ | |
9a96f550 | 818 | void drm_dev_put(struct drm_device *dev) |
099d1c29 DH |
819 | { |
820 | if (dev) | |
821 | kref_put(&dev->ref, drm_dev_release); | |
822 | } | |
9a96f550 AP |
823 | EXPORT_SYMBOL(drm_dev_put); |
824 | ||
6449b088 DV |
825 | static int create_compat_control_link(struct drm_device *dev) |
826 | { | |
827 | struct drm_minor *minor; | |
828 | char *name; | |
829 | int ret; | |
830 | ||
831 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
832 | return 0; | |
833 | ||
834 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
835 | if (!minor) | |
836 | return 0; | |
837 | ||
838 | /* | |
839 | * Some existing userspace out there uses the existing of the controlD* | |
840 | * sysfs files to figure out whether it's a modeset driver. It only does | |
841 | * readdir, hence a symlink is sufficient (and the least confusing | |
842 | * option). Otherwise controlD* is entirely unused. | |
843 | * | |
844 | * Old controlD chardev have been allocated in the range | |
845 | * 64-127. | |
846 | */ | |
847 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); | |
848 | if (!name) | |
849 | return -ENOMEM; | |
850 | ||
851 | ret = sysfs_create_link(minor->kdev->kobj.parent, | |
852 | &minor->kdev->kobj, | |
853 | name); | |
854 | ||
855 | kfree(name); | |
856 | ||
857 | return ret; | |
858 | } | |
859 | ||
860 | static void remove_compat_control_link(struct drm_device *dev) | |
861 | { | |
862 | struct drm_minor *minor; | |
863 | char *name; | |
864 | ||
865 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
866 | return; | |
867 | ||
868 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
869 | if (!minor) | |
870 | return; | |
871 | ||
7f6df440 | 872 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
6449b088 DV |
873 | if (!name) |
874 | return; | |
875 | ||
876 | sysfs_remove_link(minor->kdev->kobj.parent, name); | |
877 | ||
878 | kfree(name); | |
879 | } | |
880 | ||
c22f0ace DH |
881 | /** |
882 | * drm_dev_register - Register DRM device | |
883 | * @dev: Device to register | |
c6a1af8a | 884 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
885 | * |
886 | * Register the DRM device @dev with the system, advertise device to user-space | |
33e70110 | 887 | * and start normal device operation. @dev must be initialized via drm_dev_init() |
e28cd4d0 | 888 | * previously. |
c22f0ace DH |
889 | * |
890 | * Never call this twice on any device! | |
891 | * | |
6e3f797c | 892 | * NOTE: To ensure backward compatibility with existing drivers method this |
ef40cbf9 DV |
893 | * function calls the &drm_driver.load method after registering the device |
894 | * nodes, creating race conditions. Usage of the &drm_driver.load methods is | |
895 | * therefore deprecated, drivers must perform all initialization before calling | |
6e3f797c DV |
896 | * drm_dev_register(). |
897 | * | |
c22f0ace DH |
898 | * RETURNS: |
899 | * 0 on success, negative error code on failure. | |
900 | */ | |
901 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
902 | { | |
8f5c7aa0 | 903 | const struct drm_driver *driver = dev->driver; |
c22f0ace DH |
904 | int ret; |
905 | ||
71427795 VS |
906 | if (!driver->load) |
907 | drm_mode_config_validate(dev); | |
908 | ||
5dad34f3 DV |
909 | WARN_ON(!dev->managed.final_kfree); |
910 | ||
4017ad7b DV |
911 | if (drm_dev_needs_global_mutex(dev)) |
912 | mutex_lock(&drm_global_mutex); | |
c22f0ace | 913 | |
0b30d57a CK |
914 | if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) |
915 | accel_debugfs_register(dev); | |
916 | else | |
917 | drm_debugfs_dev_register(dev); | |
918 | ||
afcdbc86 | 919 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
920 | if (ret) |
921 | goto err_minors; | |
c22f0ace | 922 | |
a3ccc461 | 923 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 924 | if (ret) |
05b701f6 | 925 | goto err_minors; |
c22f0ace | 926 | |
7428ff70 OG |
927 | ret = drm_minor_register(dev, DRM_MINOR_ACCEL); |
928 | if (ret) | |
929 | goto err_minors; | |
930 | ||
6449b088 DV |
931 | ret = create_compat_control_link(dev); |
932 | if (ret) | |
933 | goto err_minors; | |
934 | ||
e0f32f78 DV |
935 | dev->registered = true; |
936 | ||
5f70ba02 UKK |
937 | if (driver->load) { |
938 | ret = driver->load(dev, flags); | |
c22f0ace | 939 | if (ret) |
05b701f6 | 940 | goto err_minors; |
c22f0ace DH |
941 | } |
942 | ||
5f8dec20 DB |
943 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
944 | ret = drm_modeset_register_all(dev); | |
945 | if (ret) | |
946 | goto err_unload; | |
947 | } | |
bf9fb17c | 948 | drm_panic_register(dev); |
e28cd4d0 | 949 | |
75f6dfe3 GKB |
950 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", |
951 | driver->name, driver->major, driver->minor, | |
6098909c CW |
952 | driver->patchlevel, driver->date, |
953 | dev->dev ? dev_name(dev->dev) : "virtual device", | |
7428ff70 | 954 | dev->primary ? dev->primary->index : dev->accel->index); |
75f6dfe3 | 955 | |
c22f0ace DH |
956 | goto out_unlock; |
957 | ||
5f8dec20 DB |
958 | err_unload: |
959 | if (dev->driver->unload) | |
960 | dev->driver->unload(dev); | |
05b701f6 | 961 | err_minors: |
6449b088 | 962 | remove_compat_control_link(dev); |
7428ff70 | 963 | drm_minor_unregister(dev, DRM_MINOR_ACCEL); |
a3ccc461 | 964 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 965 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c22f0ace | 966 | out_unlock: |
4017ad7b DV |
967 | if (drm_dev_needs_global_mutex(dev)) |
968 | mutex_unlock(&drm_global_mutex); | |
c22f0ace DH |
969 | return ret; |
970 | } | |
971 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
972 | |
973 | /** | |
974 | * drm_dev_unregister - Unregister DRM device | |
975 | * @dev: Device to unregister | |
976 | * | |
977 | * Unregister the DRM device from the system. This does the reverse of | |
978 | * drm_dev_register() but does not deallocate the device. The caller must call | |
6a98a6e4 BP |
979 | * drm_dev_put() to drop their final reference, unless it is managed with devres |
980 | * (as devices allocated with devm_drm_dev_alloc() are), in which case there is | |
981 | * already an unwind action registered. | |
6e3f797c | 982 | * |
c07dcd61 DV |
983 | * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), |
984 | * which can be called while there are still open users of @dev. | |
985 | * | |
6e3f797c DV |
986 | * This should be called first in the device teardown code to make sure |
987 | * userspace can't access the device instance any more. | |
c3a49737 DH |
988 | */ |
989 | void drm_dev_unregister(struct drm_device *dev) | |
990 | { | |
e6e7b48b DV |
991 | dev->registered = false; |
992 | ||
bf9fb17c JF |
993 | drm_panic_unregister(dev); |
994 | ||
c76f0f7c NT |
995 | drm_client_dev_unregister(dev); |
996 | ||
bee7fb15 | 997 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 998 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 999 | |
c3a49737 DH |
1000 | if (dev->driver->unload) |
1001 | dev->driver->unload(dev); | |
1002 | ||
6449b088 | 1003 | remove_compat_control_link(dev); |
7428ff70 | 1004 | drm_minor_unregister(dev, DRM_MINOR_ACCEL); |
a3ccc461 | 1005 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 1006 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
0b30d57a | 1007 | drm_debugfs_dev_fini(dev); |
c3a49737 DH |
1008 | } |
1009 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 1010 | |
1b7199fe DH |
1011 | /* |
1012 | * DRM Core | |
1013 | * The DRM core module initializes all global DRM objects and makes them | |
1014 | * available to drivers. Once setup, drivers can probe their respective | |
1015 | * devices. | |
1016 | * Currently, core management includes: | |
1017 | * - The "DRM-Global" key/value database | |
1018 | * - Global ID management for connectors | |
1019 | * - DRM major number allocation | |
1020 | * - DRM minor management | |
1021 | * - DRM sysfs class | |
1022 | * - DRM debugfs root | |
1023 | * | |
1024 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
1025 | * interface registered on a DRM device, you can request minor numbers from DRM | |
1026 | * core. DRM core takes care of major-number management and char-dev | |
1027 | * registration. A stub ->open() callback forwards any open() requests to the | |
1028 | * registered minor. | |
1029 | */ | |
1030 | ||
1031 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
1032 | { | |
1033 | const struct file_operations *new_fops; | |
1034 | struct drm_minor *minor; | |
1035 | int err; | |
1036 | ||
1037 | DRM_DEBUG("\n"); | |
1038 | ||
1b7199fe | 1039 | minor = drm_minor_acquire(iminor(inode)); |
591a2abf DV |
1040 | if (IS_ERR(minor)) |
1041 | return PTR_ERR(minor); | |
1b7199fe DH |
1042 | |
1043 | new_fops = fops_get(minor->dev->driver->fops); | |
1044 | if (!new_fops) { | |
1045 | err = -ENODEV; | |
591a2abf | 1046 | goto out; |
1b7199fe DH |
1047 | } |
1048 | ||
1049 | replace_fops(filp, new_fops); | |
1050 | if (filp->f_op->open) | |
1051 | err = filp->f_op->open(inode, filp); | |
1052 | else | |
1053 | err = 0; | |
1054 | ||
591a2abf | 1055 | out: |
1b7199fe | 1056 | drm_minor_release(minor); |
591a2abf | 1057 | |
1b7199fe DH |
1058 | return err; |
1059 | } | |
1060 | ||
1061 | static const struct file_operations drm_stub_fops = { | |
1062 | .owner = THIS_MODULE, | |
1063 | .open = drm_stub_open, | |
1064 | .llseek = noop_llseek, | |
1065 | }; | |
1066 | ||
2cc107dc DH |
1067 | static void drm_core_exit(void) |
1068 | { | |
a1a98689 | 1069 | drm_privacy_screen_lookup_exit(); |
7428ff70 | 1070 | accel_core_exit(); |
2cc107dc DH |
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); | |
b7e32bef | 1084 | drm_memcpy_init_early(); |
1b7199fe | 1085 | |
fcc90213 DH |
1086 | ret = drm_sysfs_init(); |
1087 | if (ret < 0) { | |
2cc107dc DH |
1088 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
1089 | goto error; | |
1b7199fe DH |
1090 | } |
1091 | ||
1092 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
1b7199fe | 1093 | |
2cc107dc DH |
1094 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
1095 | if (ret < 0) | |
1096 | goto error; | |
1097 | ||
7428ff70 OG |
1098 | ret = accel_core_init(); |
1099 | if (ret < 0) | |
1100 | goto error; | |
1101 | ||
a1a98689 HG |
1102 | drm_privacy_screen_lookup_init(); |
1103 | ||
371c2279 AM |
1104 | drm_core_init_complete = true; |
1105 | ||
e82dfa00 | 1106 | DRM_DEBUG("Initialized\n"); |
1b7199fe | 1107 | return 0; |
1b7199fe | 1108 | |
2cc107dc DH |
1109 | error: |
1110 | drm_core_exit(); | |
1b7199fe DH |
1111 | return ret; |
1112 | } | |
1113 | ||
1b7199fe DH |
1114 | module_init(drm_core_init); |
1115 | module_exit(drm_core_exit); |