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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 | |
b7e32bef | 38 | #include <drm/drm_cache.h> |
c76f0f7c | 39 | #include <drm/drm_client.h> |
0500c04e | 40 | #include <drm/drm_color_mgmt.h> |
85e634bc | 41 | #include <drm/drm_drv.h> |
0500c04e | 42 | #include <drm/drm_file.h> |
6f365e56 | 43 | #include <drm/drm_managed.h> |
0500c04e SR |
44 | #include <drm/drm_mode_object.h> |
45 | #include <drm/drm_print.h> | |
a1a98689 | 46 | #include <drm/drm_privacy_screen_machine.h> |
85e634bc | 47 | |
79190ea2 | 48 | #include "drm_crtc_internal.h" |
67d0ec4e | 49 | #include "drm_internal.h" |
0500c04e | 50 | #include "drm_legacy.h" |
1da177e4 | 51 | |
82d5e73f DH |
52 | MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
53 | MODULE_DESCRIPTION("DRM shared core routines"); | |
1da177e4 | 54 | MODULE_LICENSE("GPL and additional rights"); |
1da177e4 | 55 | |
0d639883 | 56 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 57 | static struct idr drm_minors_idr; |
2c14f28b | 58 | |
371c2279 AM |
59 | /* |
60 | * If the drm core fails to init for whatever reason, | |
61 | * we should prevent any drivers from registering with it. | |
62 | * It's best to check this at drm_dev_init(), as some drivers | |
63 | * prefer to embed struct drm_device into their own device | |
64 | * structure and call drm_dev_init() themselves. | |
65 | */ | |
c00697b5 | 66 | static bool drm_core_init_complete; |
371c2279 | 67 | |
1b7199fe | 68 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 69 | |
bee330f3 NT |
70 | DEFINE_STATIC_SRCU(drm_unplug_srcu); |
71 | ||
0d639883 DH |
72 | /* |
73 | * DRM Minors | |
74 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
75 | * of them is represented by a drm_minor object. Depending on the capabilities | |
76 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 77 | * |
0d639883 DH |
78 | * Minors can be accessed via dev->$minor_name. This pointer is either |
79 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
80 | * valid. This means, DRM minors have the same life-time as the underlying | |
81 | * device. However, this doesn't mean that the minor is active. Minors are | |
82 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 83 | */ |
0d639883 | 84 | |
05b701f6 DH |
85 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
86 | unsigned int type) | |
87 | { | |
88 | switch (type) { | |
a3ccc461 | 89 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
90 | return &dev->primary; |
91 | case DRM_MINOR_RENDER: | |
92 | return &dev->render; | |
05b701f6 | 93 | default: |
3bd07ccd | 94 | BUG(); |
05b701f6 DH |
95 | } |
96 | } | |
97 | ||
f96306f9 DV |
98 | static void drm_minor_alloc_release(struct drm_device *dev, void *data) |
99 | { | |
100 | struct drm_minor *minor = data; | |
101 | unsigned long flags; | |
102 | ||
c3b790ea DV |
103 | WARN_ON(dev != minor->dev); |
104 | ||
f96306f9 DV |
105 | put_device(minor->kdev); |
106 | ||
107 | spin_lock_irqsave(&drm_minor_lock, flags); | |
108 | idr_remove(&drm_minors_idr, minor->index); | |
109 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
110 | } | |
111 | ||
05b701f6 DH |
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 | 117 | |
f96306f9 | 118 | minor = drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL); |
05b701f6 DH |
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) | |
f96306f9 | 136 | return r; |
f1b85962 DH |
137 | |
138 | minor->index = r; | |
139 | ||
f96306f9 DV |
140 | r = drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor); |
141 | if (r) | |
142 | return r; | |
143 | ||
e1728075 | 144 | minor->kdev = drm_sysfs_minor_alloc(minor); |
f96306f9 DV |
145 | if (IS_ERR(minor->kdev)) |
146 | return PTR_ERR(minor->kdev); | |
e1728075 | 147 | |
05b701f6 DH |
148 | *drm_minor_get_slot(dev, type) = minor; |
149 | return 0; | |
bd9dfa98 DH |
150 | } |
151 | ||
afcdbc86 | 152 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 153 | { |
f1b85962 | 154 | struct drm_minor *minor; |
0d639883 | 155 | unsigned long flags; |
1da177e4 | 156 | int ret; |
1da177e4 LT |
157 | |
158 | DRM_DEBUG("\n"); | |
159 | ||
f1b85962 DH |
160 | minor = *drm_minor_get_slot(dev, type); |
161 | if (!minor) | |
05b701f6 DH |
162 | return 0; |
163 | ||
f1b85962 | 164 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 165 | if (ret) { |
156f5a78 | 166 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
a67834f8 | 167 | goto err_debugfs; |
955b12de | 168 | } |
2c14f28b | 169 | |
e1728075 DH |
170 | ret = device_add(minor->kdev); |
171 | if (ret) | |
cb6458f9 | 172 | goto err_debugfs; |
2c14f28b | 173 | |
0d639883 DH |
174 | /* replace NULL with @minor so lookups will succeed from now on */ |
175 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 176 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 177 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 178 | |
f1b85962 | 179 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
180 | return 0; |
181 | ||
cb6458f9 | 182 | err_debugfs: |
f1b85962 | 183 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
184 | return ret; |
185 | } | |
b5e89ed5 | 186 | |
afcdbc86 | 187 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 188 | { |
afcdbc86 | 189 | struct drm_minor *minor; |
0d639883 | 190 | unsigned long flags; |
afcdbc86 DH |
191 | |
192 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 193 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
194 | return; |
195 | ||
f1b85962 | 196 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 197 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 198 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 199 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 200 | |
e1728075 DH |
201 | device_del(minor->kdev); |
202 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 203 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
204 | } |
205 | ||
85e634bc | 206 | /* |
1616c525 DH |
207 | * Looks up the given minor-ID and returns the respective DRM-minor object. The |
208 | * refence-count of the underlying device is increased so you must release this | |
209 | * object with drm_minor_release(). | |
210 | * | |
211 | * As long as you hold this minor, it is guaranteed that the object and the | |
212 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
213 | * unregistered while you hold the minor. | |
1da177e4 | 214 | */ |
1616c525 | 215 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 216 | { |
1616c525 | 217 | struct drm_minor *minor; |
0d639883 | 218 | unsigned long flags; |
1616c525 | 219 | |
0d639883 | 220 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 221 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 | 222 | if (minor) |
9a96f550 | 223 | drm_dev_get(minor->dev); |
0d639883 DH |
224 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
225 | ||
226 | if (!minor) { | |
227 | return ERR_PTR(-ENODEV); | |
c07dcd61 | 228 | } else if (drm_dev_is_unplugged(minor->dev)) { |
9a96f550 | 229 | drm_dev_put(minor->dev); |
1616c525 | 230 | return ERR_PTR(-ENODEV); |
0d639883 | 231 | } |
673a394b | 232 | |
1616c525 DH |
233 | return minor; |
234 | } | |
b5e89ed5 | 235 | |
1616c525 DH |
236 | void drm_minor_release(struct drm_minor *minor) |
237 | { | |
9a96f550 | 238 | drm_dev_put(minor->dev); |
1da177e4 | 239 | } |
112b715e | 240 | |
6e3f797c DV |
241 | /** |
242 | * DOC: driver instance overview | |
243 | * | |
ea0dd85a | 244 | * A device instance for a drm driver is represented by &struct drm_device. This |
4c8e84b8 DV |
245 | * is allocated and initialized with devm_drm_dev_alloc(), usually from |
246 | * bus-specific ->probe() callbacks implemented by the driver. The driver then | |
247 | * needs to initialize all the various subsystems for the drm device like memory | |
248 | * management, vblank handling, modesetting support and initial output | |
249 | * configuration plus obviously initialize all the corresponding hardware bits. | |
250 | * Finally when everything is up and running and ready for userspace the device | |
251 | * instance can be published using drm_dev_register(). | |
6e3f797c | 252 | * |
0ae865ef | 253 | * There is also deprecated support for initializing device instances using |
ef40cbf9 | 254 | * bus-specific helpers and the &drm_driver.load callback. But due to |
6e3f797c DV |
255 | * backwards-compatibility needs the device instance have to be published too |
256 | * early, which requires unpretty global locking to make safe and is therefore | |
257 | * only support for existing drivers not yet converted to the new scheme. | |
258 | * | |
259 | * When cleaning up a device instance everything needs to be done in reverse: | |
260 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
261 | * any other resources allocated at device initialization and drop the driver's | |
9a96f550 | 262 | * reference to &drm_device using drm_dev_put(). |
6e3f797c | 263 | * |
9e1ed9fb DV |
264 | * Note that any allocation or resource which is visible to userspace must be |
265 | * released only when the final drm_dev_put() is called, and not when the | |
266 | * driver is unbound from the underlying physical struct &device. Best to use | |
267 | * &drm_device managed resources with drmm_add_action(), drmm_kmalloc() and | |
268 | * related functions. | |
269 | * | |
270 | * devres managed resources like devm_kmalloc() can only be used for resources | |
271 | * directly related to the underlying hardware device, and only used in code | |
272 | * paths fully protected by drm_dev_enter() and drm_dev_exit(). | |
de99f060 NT |
273 | * |
274 | * Display driver example | |
275 | * ~~~~~~~~~~~~~~~~~~~~~~ | |
276 | * | |
277 | * The following example shows a typical structure of a DRM display driver. | |
278 | * The example focus on the probe() function and the other functions that is | |
4c8e84b8 | 279 | * almost always present and serves as a demonstration of devm_drm_dev_alloc(). |
de99f060 NT |
280 | * |
281 | * .. code-block:: c | |
282 | * | |
283 | * struct driver_device { | |
284 | * struct drm_device drm; | |
285 | * void *userspace_facing; | |
286 | * struct clk *pclk; | |
287 | * }; | |
288 | * | |
8f5c7aa0 | 289 | * static const struct drm_driver driver_drm_driver = { |
de99f060 | 290 | * [...] |
de99f060 NT |
291 | * }; |
292 | * | |
293 | * static int driver_probe(struct platform_device *pdev) | |
294 | * { | |
295 | * struct driver_device *priv; | |
296 | * struct drm_device *drm; | |
297 | * int ret; | |
298 | * | |
4c8e84b8 DV |
299 | * priv = devm_drm_dev_alloc(&pdev->dev, &driver_drm_driver, |
300 | * struct driver_device, drm); | |
301 | * if (IS_ERR(priv)) | |
302 | * return PTR_ERR(priv); | |
de99f060 NT |
303 | * drm = &priv->drm; |
304 | * | |
c3b790ea DV |
305 | * ret = drmm_mode_config_init(drm); |
306 | * if (ret) | |
307 | * return ret; | |
de99f060 | 308 | * |
5dad34f3 | 309 | * priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL); |
de99f060 NT |
310 | * if (!priv->userspace_facing) |
311 | * return -ENOMEM; | |
312 | * | |
313 | * priv->pclk = devm_clk_get(dev, "PCLK"); | |
314 | * if (IS_ERR(priv->pclk)) | |
315 | * return PTR_ERR(priv->pclk); | |
316 | * | |
56d8d641 | 317 | * // Further setup, display pipeline etc |
de99f060 NT |
318 | * |
319 | * platform_set_drvdata(pdev, drm); | |
320 | * | |
321 | * drm_mode_config_reset(drm); | |
322 | * | |
323 | * ret = drm_dev_register(drm); | |
324 | * if (ret) | |
325 | * return ret; | |
326 | * | |
327 | * drm_fbdev_generic_setup(drm, 32); | |
328 | * | |
329 | * return 0; | |
330 | * } | |
331 | * | |
56d8d641 | 332 | * // This function is called before the devm_ resources are released |
de99f060 NT |
333 | * static int driver_remove(struct platform_device *pdev) |
334 | * { | |
335 | * struct drm_device *drm = platform_get_drvdata(pdev); | |
336 | * | |
337 | * drm_dev_unregister(drm); | |
338 | * drm_atomic_helper_shutdown(drm) | |
339 | * | |
340 | * return 0; | |
341 | * } | |
342 | * | |
56d8d641 | 343 | * // This function is called on kernel restart and shutdown |
de99f060 NT |
344 | * static void driver_shutdown(struct platform_device *pdev) |
345 | * { | |
346 | * drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); | |
347 | * } | |
348 | * | |
349 | * static int __maybe_unused driver_pm_suspend(struct device *dev) | |
350 | * { | |
351 | * return drm_mode_config_helper_suspend(dev_get_drvdata(dev)); | |
352 | * } | |
353 | * | |
354 | * static int __maybe_unused driver_pm_resume(struct device *dev) | |
355 | * { | |
356 | * drm_mode_config_helper_resume(dev_get_drvdata(dev)); | |
357 | * | |
358 | * return 0; | |
359 | * } | |
360 | * | |
361 | * static const struct dev_pm_ops driver_pm_ops = { | |
362 | * SET_SYSTEM_SLEEP_PM_OPS(driver_pm_suspend, driver_pm_resume) | |
363 | * }; | |
364 | * | |
365 | * static struct platform_driver driver_driver = { | |
366 | * .driver = { | |
367 | * [...] | |
368 | * .pm = &driver_pm_ops, | |
369 | * }, | |
370 | * .probe = driver_probe, | |
371 | * .remove = driver_remove, | |
372 | * .shutdown = driver_shutdown, | |
373 | * }; | |
374 | * module_platform_driver(driver_driver); | |
375 | * | |
376 | * Drivers that want to support device unplugging (USB, DT overlay unload) should | |
377 | * use drm_dev_unplug() instead of drm_dev_unregister(). The driver must protect | |
378 | * regions that is accessing device resources to prevent use after they're | |
379 | * released. This is done using drm_dev_enter() and drm_dev_exit(). There is one | |
380 | * shortcoming however, drm_dev_unplug() marks the drm_device as unplugged before | |
381 | * drm_atomic_helper_shutdown() is called. This means that if the disable code | |
382 | * paths are protected, they will not run on regular driver module unload, | |
0ae865ef | 383 | * possibly leaving the hardware enabled. |
6e3f797c DV |
384 | */ |
385 | ||
112b715e | 386 | /** |
c6a1af8a TR |
387 | * drm_put_dev - Unregister and release a DRM device |
388 | * @dev: DRM device | |
112b715e | 389 | * |
c6a1af8a | 390 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 391 | * |
c6a1af8a | 392 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
393 | * |
394 | * Note: Use of this function is deprecated. It will eventually go away | |
9a96f550 | 395 | * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly |
6e3f797c DV |
396 | * instead to make sure that the device isn't userspace accessible any more |
397 | * while teardown is in progress, ensuring that userspace can't access an | |
398 | * inconsistent state. | |
112b715e KH |
399 | */ |
400 | void drm_put_dev(struct drm_device *dev) | |
401 | { | |
112b715e KH |
402 | DRM_DEBUG("\n"); |
403 | ||
404 | if (!dev) { | |
405 | DRM_ERROR("cleanup called no dev\n"); | |
406 | return; | |
407 | } | |
408 | ||
c3a49737 | 409 | drm_dev_unregister(dev); |
9a96f550 | 410 | drm_dev_put(dev); |
112b715e KH |
411 | } |
412 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d | 413 | |
bee330f3 NT |
414 | /** |
415 | * drm_dev_enter - Enter device critical section | |
416 | * @dev: DRM device | |
417 | * @idx: Pointer to index that will be passed to the matching drm_dev_exit() | |
418 | * | |
419 | * This function marks and protects the beginning of a section that should not | |
420 | * be entered after the device has been unplugged. The section end is marked | |
421 | * with drm_dev_exit(). Calls to this function can be nested. | |
422 | * | |
423 | * Returns: | |
424 | * True if it is OK to enter the section, false otherwise. | |
425 | */ | |
426 | bool drm_dev_enter(struct drm_device *dev, int *idx) | |
c07dcd61 | 427 | { |
bee330f3 NT |
428 | *idx = srcu_read_lock(&drm_unplug_srcu); |
429 | ||
430 | if (dev->unplugged) { | |
431 | srcu_read_unlock(&drm_unplug_srcu, *idx); | |
432 | return false; | |
433 | } | |
434 | ||
435 | return true; | |
c07dcd61 | 436 | } |
bee330f3 NT |
437 | EXPORT_SYMBOL(drm_dev_enter); |
438 | ||
439 | /** | |
440 | * drm_dev_exit - Exit device critical section | |
441 | * @idx: index returned from drm_dev_enter() | |
442 | * | |
443 | * This function marks the end of a section that should not be entered after | |
444 | * the device has been unplugged. | |
445 | */ | |
446 | void drm_dev_exit(int idx) | |
c07dcd61 | 447 | { |
bee330f3 | 448 | srcu_read_unlock(&drm_unplug_srcu, idx); |
c07dcd61 | 449 | } |
bee330f3 | 450 | EXPORT_SYMBOL(drm_dev_exit); |
c07dcd61 DV |
451 | |
452 | /** | |
453 | * drm_dev_unplug - unplug a DRM device | |
454 | * @dev: DRM device | |
455 | * | |
456 | * This unplugs a hotpluggable DRM device, which makes it inaccessible to | |
bee330f3 NT |
457 | * userspace operations. Entry-points can use drm_dev_enter() and |
458 | * drm_dev_exit() to protect device resources in a race free manner. This | |
c07dcd61 DV |
459 | * essentially unregisters the device like drm_dev_unregister(), but can be |
460 | * called while there are still open users of @dev. | |
461 | */ | |
462 | void drm_dev_unplug(struct drm_device *dev) | |
2c07a21d | 463 | { |
bee330f3 NT |
464 | /* |
465 | * After synchronizing any critical read section is guaranteed to see | |
466 | * the new value of ->unplugged, and any critical section which might | |
467 | * still have seen the old value of ->unplugged is guaranteed to have | |
468 | * finished. | |
469 | */ | |
470 | dev->unplugged = true; | |
471 | synchronize_srcu(&drm_unplug_srcu); | |
069035c5 OA |
472 | |
473 | drm_dev_unregister(dev); | |
b9d4efa8 AG |
474 | |
475 | /* Clear all CPU mappings pointing to this device */ | |
476 | unmap_mapping_range(dev->anon_inode->i_mapping, 0, 0, 1); | |
2c07a21d | 477 | } |
c07dcd61 | 478 | EXPORT_SYMBOL(drm_dev_unplug); |
1bb72532 | 479 | |
31bbe16f DH |
480 | /* |
481 | * DRM internal mount | |
482 | * We want to be able to allocate our own "struct address_space" to control | |
483 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
484 | * stand-alone address_space objects, so we need an underlying inode. As there | |
485 | * is no way to allocate an independent inode easily, we need a fake internal | |
486 | * VFS mount-point. | |
487 | * | |
488 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
489 | * frees it again. You are allowed to use iget() and iput() to get references to | |
490 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
491 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
492 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
493 | * between multiple inode-users. You could, technically, call | |
494 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
495 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
496 | */ | |
497 | ||
498 | static int drm_fs_cnt; | |
499 | static struct vfsmount *drm_fs_mnt; | |
500 | ||
4a457910 | 501 | static int drm_fs_init_fs_context(struct fs_context *fc) |
31bbe16f | 502 | { |
4a457910 | 503 | return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM; |
31bbe16f DH |
504 | } |
505 | ||
506 | static struct file_system_type drm_fs_type = { | |
507 | .name = "drm", | |
508 | .owner = THIS_MODULE, | |
4a457910 | 509 | .init_fs_context = drm_fs_init_fs_context, |
31bbe16f DH |
510 | .kill_sb = kill_anon_super, |
511 | }; | |
512 | ||
513 | static struct inode *drm_fs_inode_new(void) | |
514 | { | |
515 | struct inode *inode; | |
516 | int r; | |
517 | ||
518 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
519 | if (r < 0) { | |
520 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
521 | return ERR_PTR(r); | |
522 | } | |
523 | ||
524 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
525 | if (IS_ERR(inode)) | |
526 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
527 | ||
528 | return inode; | |
529 | } | |
530 | ||
531 | static void drm_fs_inode_free(struct inode *inode) | |
532 | { | |
533 | if (inode) { | |
534 | iput(inode); | |
535 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
536 | } | |
537 | } | |
538 | ||
86ab67df DV |
539 | /** |
540 | * DOC: component helper usage recommendations | |
541 | * | |
542 | * DRM drivers that drive hardware where a logical device consists of a pile of | |
543 | * independent hardware blocks are recommended to use the :ref:`component helper | |
544 | * library<component>`. For consistency and better options for code reuse the | |
545 | * following guidelines apply: | |
546 | * | |
547 | * - The entire device initialization procedure should be run from the | |
4c8e84b8 DV |
548 | * &component_master_ops.master_bind callback, starting with |
549 | * devm_drm_dev_alloc(), then binding all components with | |
550 | * component_bind_all() and finishing with drm_dev_register(). | |
86ab67df DV |
551 | * |
552 | * - The opaque pointer passed to all components through component_bind_all() | |
553 | * should point at &struct drm_device of the device instance, not some driver | |
554 | * specific private structure. | |
555 | * | |
556 | * - The component helper fills the niche where further standardization of | |
557 | * interfaces is not practical. When there already is, or will be, a | |
558 | * standardized interface like &drm_bridge or &drm_panel, providing its own | |
559 | * functions to find such components at driver load time, like | |
560 | * drm_of_find_panel_or_bridge(), then the component helper should not be | |
561 | * used. | |
562 | */ | |
563 | ||
2cbf7fc6 DV |
564 | static void drm_dev_init_release(struct drm_device *dev, void *res) |
565 | { | |
566 | drm_legacy_ctxbitmap_cleanup(dev); | |
567 | drm_legacy_remove_map_hash(dev); | |
568 | drm_fs_inode_free(dev->anon_inode); | |
569 | ||
570 | put_device(dev->dev); | |
571 | /* Prevent use-after-free in drm_managed_release when debugging is | |
572 | * enabled. Slightly awkward, but can't really be helped. */ | |
573 | dev->dev = NULL; | |
574 | mutex_destroy(&dev->master_mutex); | |
575 | mutex_destroy(&dev->clientlist_mutex); | |
576 | mutex_destroy(&dev->filelist_mutex); | |
577 | mutex_destroy(&dev->struct_mutex); | |
578 | drm_legacy_destroy_members(dev); | |
579 | } | |
580 | ||
a7d39439 | 581 | static int drm_dev_init(struct drm_device *dev, |
8f5c7aa0 | 582 | const struct drm_driver *driver, |
a7d39439 | 583 | struct device *parent) |
1bb72532 | 584 | { |
acf20ed0 | 585 | struct inode *inode; |
1bb72532 DH |
586 | int ret; |
587 | ||
371c2279 AM |
588 | if (!drm_core_init_complete) { |
589 | DRM_ERROR("DRM core is not initialized\n"); | |
590 | return -ENODEV; | |
591 | } | |
592 | ||
8b6fc114 AP |
593 | if (WARN_ON(!parent)) |
594 | return -EINVAL; | |
f08877e7 | 595 | |
099d1c29 | 596 | kref_init(&dev->ref); |
56be6503 | 597 | dev->dev = get_device(parent); |
1bb72532 DH |
598 | dev->driver = driver; |
599 | ||
c6603c74 DV |
600 | INIT_LIST_HEAD(&dev->managed.resources); |
601 | spin_lock_init(&dev->managed.lock); | |
602 | ||
18ace11f VS |
603 | /* no per-device feature limits by default */ |
604 | dev->driver_features = ~0u; | |
605 | ||
8437dd73 | 606 | drm_legacy_init_members(dev); |
1bb72532 | 607 | INIT_LIST_HEAD(&dev->filelist); |
c76f0f7c NT |
608 | INIT_LIST_HEAD(&dev->filelist_internal); |
609 | INIT_LIST_HEAD(&dev->clientlist); | |
1bb72532 DH |
610 | INIT_LIST_HEAD(&dev->vblank_event_list); |
611 | ||
1bb72532 DH |
612 | spin_lock_init(&dev->event_lock); |
613 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 614 | mutex_init(&dev->filelist_mutex); |
c76f0f7c | 615 | mutex_init(&dev->clientlist_mutex); |
c996fd0b | 616 | mutex_init(&dev->master_mutex); |
1bb72532 | 617 | |
2cbf7fc6 DV |
618 | ret = drmm_add_action(dev, drm_dev_init_release, NULL); |
619 | if (ret) | |
620 | return ret; | |
621 | ||
acf20ed0 WH |
622 | inode = drm_fs_inode_new(); |
623 | if (IS_ERR(inode)) { | |
624 | ret = PTR_ERR(inode); | |
6796cb16 | 625 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); |
2cbf7fc6 | 626 | goto err; |
6796cb16 DH |
627 | } |
628 | ||
acf20ed0 WH |
629 | dev->anon_inode = inode; |
630 | ||
6d6dfcfb | 631 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
632 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
633 | if (ret) | |
f96306f9 | 634 | goto err; |
05b701f6 DH |
635 | } |
636 | ||
a3ccc461 | 637 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 | 638 | if (ret) |
f96306f9 | 639 | goto err; |
05b701f6 | 640 | |
fabb0e2a | 641 | ret = drm_legacy_create_map_hash(dev); |
b209aca3 | 642 | if (ret) |
f96306f9 | 643 | goto err; |
1bb72532 | 644 | |
ba6976c1 | 645 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 646 | |
1bcecfac | 647 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
648 | ret = drm_gem_init(dev); |
649 | if (ret) { | |
650 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
f96306f9 | 651 | goto err; |
1bb72532 DH |
652 | } |
653 | } | |
654 | ||
f08877e7 | 655 | ret = drm_dev_set_unique(dev, dev_name(parent)); |
5079c464 | 656 | if (ret) |
641b9103 | 657 | goto err; |
e112e593 | 658 | |
b209aca3 | 659 | return 0; |
1bb72532 | 660 | |
2cbf7fc6 DV |
661 | err: |
662 | drm_managed_release(dev); | |
663 | ||
b209aca3 CW |
664 | return ret; |
665 | } | |
b209aca3 | 666 | |
9b1f1b6b NT |
667 | static void devm_drm_dev_init_release(void *data) |
668 | { | |
669 | drm_dev_put(data); | |
670 | } | |
671 | ||
4c8e84b8 DV |
672 | static int devm_drm_dev_init(struct device *parent, |
673 | struct drm_device *dev, | |
8f5c7aa0 | 674 | const struct drm_driver *driver) |
9b1f1b6b NT |
675 | { |
676 | int ret; | |
677 | ||
9b1f1b6b NT |
678 | ret = drm_dev_init(dev, driver, parent); |
679 | if (ret) | |
680 | return ret; | |
681 | ||
13283a24 TT |
682 | return devm_add_action_or_reset(parent, |
683 | devm_drm_dev_init_release, dev); | |
9b1f1b6b | 684 | } |
9b1f1b6b | 685 | |
8f5c7aa0 DV |
686 | void *__devm_drm_dev_alloc(struct device *parent, |
687 | const struct drm_driver *driver, | |
b0b5849e DV |
688 | size_t size, size_t offset) |
689 | { | |
690 | void *container; | |
691 | struct drm_device *drm; | |
692 | int ret; | |
693 | ||
694 | container = kzalloc(size, GFP_KERNEL); | |
695 | if (!container) | |
696 | return ERR_PTR(-ENOMEM); | |
697 | ||
698 | drm = container + offset; | |
699 | ret = devm_drm_dev_init(parent, drm, driver); | |
700 | if (ret) { | |
701 | kfree(container); | |
702 | return ERR_PTR(ret); | |
703 | } | |
704 | drmm_add_final_kfree(drm, container); | |
705 | ||
706 | return container; | |
707 | } | |
708 | EXPORT_SYMBOL(__devm_drm_dev_alloc); | |
709 | ||
b209aca3 CW |
710 | /** |
711 | * drm_dev_alloc - Allocate new DRM device | |
712 | * @driver: DRM driver to allocate device for | |
713 | * @parent: Parent device object | |
714 | * | |
4c8e84b8 DV |
715 | * This is the deprecated version of devm_drm_dev_alloc(), which does not support |
716 | * subclassing through embedding the struct &drm_device in a driver private | |
717 | * structure, and which does not support automatic cleanup through devres. | |
b209aca3 CW |
718 | * |
719 | * RETURNS: | |
0f288605 | 720 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 | 721 | */ |
8f5c7aa0 | 722 | struct drm_device *drm_dev_alloc(const struct drm_driver *driver, |
b209aca3 CW |
723 | struct device *parent) |
724 | { | |
725 | struct drm_device *dev; | |
726 | int ret; | |
727 | ||
728 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
729 | if (!dev) | |
0f288605 | 730 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
731 | |
732 | ret = drm_dev_init(dev, driver, parent); | |
733 | if (ret) { | |
734 | kfree(dev); | |
0f288605 | 735 | return ERR_PTR(ret); |
b209aca3 CW |
736 | } |
737 | ||
6f365e56 DV |
738 | drmm_add_final_kfree(dev, dev); |
739 | ||
b209aca3 | 740 | return dev; |
1bb72532 DH |
741 | } |
742 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 743 | |
099d1c29 | 744 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 745 | { |
099d1c29 | 746 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 747 | |
c6603c74 | 748 | if (dev->driver->release) |
f30c9257 | 749 | dev->driver->release(dev); |
c6603c74 DV |
750 | |
751 | drm_managed_release(dev); | |
752 | ||
175233f9 | 753 | kfree(dev->managed.final_kfree); |
0dc8fe59 | 754 | } |
099d1c29 DH |
755 | |
756 | /** | |
9a96f550 | 757 | * drm_dev_get - Take reference of a DRM device |
099d1c29 DH |
758 | * @dev: device to take reference of or NULL |
759 | * | |
760 | * This increases the ref-count of @dev by one. You *must* already own a | |
9a96f550 | 761 | * reference when calling this. Use drm_dev_put() to drop this reference |
099d1c29 DH |
762 | * again. |
763 | * | |
764 | * This function never fails. However, this function does not provide *any* | |
765 | * guarantee whether the device is alive or running. It only provides a | |
766 | * reference to the object and the memory associated with it. | |
767 | */ | |
9a96f550 | 768 | void drm_dev_get(struct drm_device *dev) |
099d1c29 DH |
769 | { |
770 | if (dev) | |
771 | kref_get(&dev->ref); | |
772 | } | |
9a96f550 | 773 | EXPORT_SYMBOL(drm_dev_get); |
099d1c29 DH |
774 | |
775 | /** | |
9a96f550 | 776 | * drm_dev_put - Drop reference of a DRM device |
099d1c29 DH |
777 | * @dev: device to drop reference of or NULL |
778 | * | |
779 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
780 | * ref-count drops to zero. | |
781 | */ | |
9a96f550 | 782 | void drm_dev_put(struct drm_device *dev) |
099d1c29 DH |
783 | { |
784 | if (dev) | |
785 | kref_put(&dev->ref, drm_dev_release); | |
786 | } | |
9a96f550 AP |
787 | EXPORT_SYMBOL(drm_dev_put); |
788 | ||
6449b088 DV |
789 | static int create_compat_control_link(struct drm_device *dev) |
790 | { | |
791 | struct drm_minor *minor; | |
792 | char *name; | |
793 | int ret; | |
794 | ||
795 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
796 | return 0; | |
797 | ||
798 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
799 | if (!minor) | |
800 | return 0; | |
801 | ||
802 | /* | |
803 | * Some existing userspace out there uses the existing of the controlD* | |
804 | * sysfs files to figure out whether it's a modeset driver. It only does | |
805 | * readdir, hence a symlink is sufficient (and the least confusing | |
806 | * option). Otherwise controlD* is entirely unused. | |
807 | * | |
808 | * Old controlD chardev have been allocated in the range | |
809 | * 64-127. | |
810 | */ | |
811 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); | |
812 | if (!name) | |
813 | return -ENOMEM; | |
814 | ||
815 | ret = sysfs_create_link(minor->kdev->kobj.parent, | |
816 | &minor->kdev->kobj, | |
817 | name); | |
818 | ||
819 | kfree(name); | |
820 | ||
821 | return ret; | |
822 | } | |
823 | ||
824 | static void remove_compat_control_link(struct drm_device *dev) | |
825 | { | |
826 | struct drm_minor *minor; | |
827 | char *name; | |
828 | ||
829 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
830 | return; | |
831 | ||
832 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
833 | if (!minor) | |
834 | return; | |
835 | ||
7f6df440 | 836 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
6449b088 DV |
837 | if (!name) |
838 | return; | |
839 | ||
840 | sysfs_remove_link(minor->kdev->kobj.parent, name); | |
841 | ||
842 | kfree(name); | |
843 | } | |
844 | ||
c22f0ace DH |
845 | /** |
846 | * drm_dev_register - Register DRM device | |
847 | * @dev: Device to register | |
c6a1af8a | 848 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
849 | * |
850 | * Register the DRM device @dev with the system, advertise device to user-space | |
33e70110 | 851 | * and start normal device operation. @dev must be initialized via drm_dev_init() |
e28cd4d0 | 852 | * previously. |
c22f0ace DH |
853 | * |
854 | * Never call this twice on any device! | |
855 | * | |
6e3f797c | 856 | * NOTE: To ensure backward compatibility with existing drivers method this |
ef40cbf9 DV |
857 | * function calls the &drm_driver.load method after registering the device |
858 | * nodes, creating race conditions. Usage of the &drm_driver.load methods is | |
859 | * therefore deprecated, drivers must perform all initialization before calling | |
6e3f797c DV |
860 | * drm_dev_register(). |
861 | * | |
c22f0ace DH |
862 | * RETURNS: |
863 | * 0 on success, negative error code on failure. | |
864 | */ | |
865 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
866 | { | |
8f5c7aa0 | 867 | const struct drm_driver *driver = dev->driver; |
c22f0ace DH |
868 | int ret; |
869 | ||
71427795 VS |
870 | if (!driver->load) |
871 | drm_mode_config_validate(dev); | |
872 | ||
5dad34f3 DV |
873 | WARN_ON(!dev->managed.final_kfree); |
874 | ||
4017ad7b DV |
875 | if (drm_dev_needs_global_mutex(dev)) |
876 | mutex_lock(&drm_global_mutex); | |
c22f0ace | 877 | |
afcdbc86 | 878 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
879 | if (ret) |
880 | goto err_minors; | |
c22f0ace | 881 | |
a3ccc461 | 882 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 883 | if (ret) |
05b701f6 | 884 | goto err_minors; |
c22f0ace | 885 | |
6449b088 DV |
886 | ret = create_compat_control_link(dev); |
887 | if (ret) | |
888 | goto err_minors; | |
889 | ||
e0f32f78 DV |
890 | dev->registered = true; |
891 | ||
c22f0ace DH |
892 | if (dev->driver->load) { |
893 | ret = dev->driver->load(dev, flags); | |
894 | if (ret) | |
05b701f6 | 895 | goto err_minors; |
c22f0ace DH |
896 | } |
897 | ||
bee7fb15 | 898 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 899 | drm_modeset_register_all(dev); |
e28cd4d0 | 900 | |
75f6dfe3 GKB |
901 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", |
902 | driver->name, driver->major, driver->minor, | |
6098909c CW |
903 | driver->patchlevel, driver->date, |
904 | dev->dev ? dev_name(dev->dev) : "virtual device", | |
75f6dfe3 GKB |
905 | dev->primary->index); |
906 | ||
c22f0ace DH |
907 | goto out_unlock; |
908 | ||
05b701f6 | 909 | err_minors: |
6449b088 | 910 | remove_compat_control_link(dev); |
a3ccc461 | 911 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 912 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c22f0ace | 913 | out_unlock: |
4017ad7b DV |
914 | if (drm_dev_needs_global_mutex(dev)) |
915 | mutex_unlock(&drm_global_mutex); | |
c22f0ace DH |
916 | return ret; |
917 | } | |
918 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
919 | |
920 | /** | |
921 | * drm_dev_unregister - Unregister DRM device | |
922 | * @dev: Device to unregister | |
923 | * | |
924 | * Unregister the DRM device from the system. This does the reverse of | |
925 | * drm_dev_register() but does not deallocate the device. The caller must call | |
9a96f550 | 926 | * drm_dev_put() to drop their final reference. |
6e3f797c | 927 | * |
c07dcd61 DV |
928 | * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), |
929 | * which can be called while there are still open users of @dev. | |
930 | * | |
6e3f797c DV |
931 | * This should be called first in the device teardown code to make sure |
932 | * userspace can't access the device instance any more. | |
c3a49737 DH |
933 | */ |
934 | void drm_dev_unregister(struct drm_device *dev) | |
935 | { | |
2e45eeac DV |
936 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
937 | drm_lastclose(dev); | |
c3a49737 | 938 | |
e6e7b48b DV |
939 | dev->registered = false; |
940 | ||
c76f0f7c NT |
941 | drm_client_dev_unregister(dev); |
942 | ||
bee7fb15 | 943 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 944 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 945 | |
c3a49737 DH |
946 | if (dev->driver->unload) |
947 | dev->driver->unload(dev); | |
948 | ||
6bff2279 | 949 | drm_legacy_pci_agp_destroy(dev); |
35a28021 | 950 | drm_legacy_rmmaps(dev); |
c3a49737 | 951 | |
6449b088 | 952 | remove_compat_control_link(dev); |
a3ccc461 | 953 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 954 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c3a49737 DH |
955 | } |
956 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 957 | |
a6b5fac5 GH |
958 | /** |
959 | * drm_dev_set_unique - Set the unique name of a DRM device | |
960 | * @dev: device of which to set the unique name | |
961 | * @name: unique name | |
962 | * | |
33e70110 DV |
963 | * Sets the unique name of a DRM device using the specified string. This is |
964 | * already done by drm_dev_init(), drivers should only override the default | |
965 | * unique name for backwards compatibility reasons. | |
a6b5fac5 GH |
966 | * |
967 | * Return: 0 on success or a negative error code on failure. | |
968 | */ | |
969 | int drm_dev_set_unique(struct drm_device *dev, const char *name) | |
970 | { | |
a5c71fdb DV |
971 | drmm_kfree(dev, dev->unique); |
972 | dev->unique = drmm_kstrdup(dev, name, GFP_KERNEL); | |
a6b5fac5 GH |
973 | |
974 | return dev->unique ? 0 : -ENOMEM; | |
975 | } | |
976 | EXPORT_SYMBOL(drm_dev_set_unique); | |
977 | ||
1b7199fe DH |
978 | /* |
979 | * DRM Core | |
980 | * The DRM core module initializes all global DRM objects and makes them | |
981 | * available to drivers. Once setup, drivers can probe their respective | |
982 | * devices. | |
983 | * Currently, core management includes: | |
984 | * - The "DRM-Global" key/value database | |
985 | * - Global ID management for connectors | |
986 | * - DRM major number allocation | |
987 | * - DRM minor management | |
988 | * - DRM sysfs class | |
989 | * - DRM debugfs root | |
990 | * | |
991 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
992 | * interface registered on a DRM device, you can request minor numbers from DRM | |
993 | * core. DRM core takes care of major-number management and char-dev | |
994 | * registration. A stub ->open() callback forwards any open() requests to the | |
995 | * registered minor. | |
996 | */ | |
997 | ||
998 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
999 | { | |
1000 | const struct file_operations *new_fops; | |
1001 | struct drm_minor *minor; | |
1002 | int err; | |
1003 | ||
1004 | DRM_DEBUG("\n"); | |
1005 | ||
1b7199fe | 1006 | minor = drm_minor_acquire(iminor(inode)); |
591a2abf DV |
1007 | if (IS_ERR(minor)) |
1008 | return PTR_ERR(minor); | |
1b7199fe DH |
1009 | |
1010 | new_fops = fops_get(minor->dev->driver->fops); | |
1011 | if (!new_fops) { | |
1012 | err = -ENODEV; | |
591a2abf | 1013 | goto out; |
1b7199fe DH |
1014 | } |
1015 | ||
1016 | replace_fops(filp, new_fops); | |
1017 | if (filp->f_op->open) | |
1018 | err = filp->f_op->open(inode, filp); | |
1019 | else | |
1020 | err = 0; | |
1021 | ||
591a2abf | 1022 | out: |
1b7199fe | 1023 | drm_minor_release(minor); |
591a2abf | 1024 | |
1b7199fe DH |
1025 | return err; |
1026 | } | |
1027 | ||
1028 | static const struct file_operations drm_stub_fops = { | |
1029 | .owner = THIS_MODULE, | |
1030 | .open = drm_stub_open, | |
1031 | .llseek = noop_llseek, | |
1032 | }; | |
1033 | ||
2cc107dc DH |
1034 | static void drm_core_exit(void) |
1035 | { | |
a1a98689 | 1036 | drm_privacy_screen_lookup_exit(); |
2cc107dc DH |
1037 | unregister_chrdev(DRM_MAJOR, "drm"); |
1038 | debugfs_remove(drm_debugfs_root); | |
1039 | drm_sysfs_destroy(); | |
1040 | idr_destroy(&drm_minors_idr); | |
1041 | drm_connector_ida_destroy(); | |
2cc107dc DH |
1042 | } |
1043 | ||
1b7199fe DH |
1044 | static int __init drm_core_init(void) |
1045 | { | |
2cc107dc | 1046 | int ret; |
1b7199fe | 1047 | |
1b7199fe DH |
1048 | drm_connector_ida_init(); |
1049 | idr_init(&drm_minors_idr); | |
b7e32bef | 1050 | drm_memcpy_init_early(); |
1b7199fe | 1051 | |
fcc90213 DH |
1052 | ret = drm_sysfs_init(); |
1053 | if (ret < 0) { | |
2cc107dc DH |
1054 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
1055 | goto error; | |
1b7199fe DH |
1056 | } |
1057 | ||
1058 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
1b7199fe | 1059 | |
2cc107dc DH |
1060 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
1061 | if (ret < 0) | |
1062 | goto error; | |
1063 | ||
a1a98689 HG |
1064 | drm_privacy_screen_lookup_init(); |
1065 | ||
371c2279 AM |
1066 | drm_core_init_complete = true; |
1067 | ||
e82dfa00 | 1068 | DRM_DEBUG("Initialized\n"); |
1b7199fe | 1069 | return 0; |
1b7199fe | 1070 | |
2cc107dc DH |
1071 | error: |
1072 | drm_core_exit(); | |
1b7199fe DH |
1073 | return ret; |
1074 | } | |
1075 | ||
1b7199fe DH |
1076 | module_init(drm_core_init); |
1077 | module_exit(drm_core_exit); |