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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> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
760285e7 DH |
35 | #include <drm/drmP.h> |
36 | #include <drm/drm_core.h> | |
e7b96070 | 37 | #include "drm_legacy.h" |
67d0ec4e | 38 | #include "drm_internal.h" |
1da177e4 | 39 | |
02d0a493 | 40 | unsigned int drm_debug = 0; /* bitmask of DRM_UT_x */ |
1da177e4 LT |
41 | EXPORT_SYMBOL(drm_debug); |
42 | ||
b5e89ed5 DA |
43 | MODULE_AUTHOR(CORE_AUTHOR); |
44 | MODULE_DESCRIPTION(CORE_DESC); | |
1da177e4 | 45 | MODULE_LICENSE("GPL and additional rights"); |
1da177e4 | 46 | MODULE_PARM_DESC(debug, "Enable debug output"); |
4ed0ce3d | 47 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
27641c3f | 48 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); |
c61eef72 | 49 | MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); |
1da177e4 | 50 | |
c0758146 | 51 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 52 | |
0d639883 | 53 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 54 | static struct idr drm_minors_idr; |
2c14f28b | 55 | |
1b7199fe | 56 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 57 | |
a1f1a79c | 58 | void drm_err(const char *format, ...) |
5ad3d883 JP |
59 | { |
60 | struct va_format vaf; | |
61 | va_list args; | |
5ad3d883 JP |
62 | |
63 | va_start(args, format); | |
64 | ||
65 | vaf.fmt = format; | |
66 | vaf.va = &args; | |
67 | ||
2ee762b3 | 68 | printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV", |
a1f1a79c | 69 | __builtin_return_address(0), &vaf); |
5ad3d883 JP |
70 | |
71 | va_end(args); | |
5ad3d883 JP |
72 | } |
73 | EXPORT_SYMBOL(drm_err); | |
74 | ||
1287aa90 | 75 | void drm_ut_debug_printk(const char *function_name, const char *format, ...) |
4fefcb27 | 76 | { |
fffb9065 | 77 | struct va_format vaf; |
4fefcb27 | 78 | va_list args; |
1da177e4 | 79 | |
a73d4e91 LD |
80 | va_start(args, format); |
81 | vaf.fmt = format; | |
82 | vaf.va = &args; | |
83 | ||
0ed02983 | 84 | printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf); |
a73d4e91 LD |
85 | |
86 | va_end(args); | |
4fefcb27 | 87 | } |
88 | EXPORT_SYMBOL(drm_ut_debug_printk); | |
5ad3d883 | 89 | |
7c1c2871 DA |
90 | struct drm_master *drm_master_create(struct drm_minor *minor) |
91 | { | |
92 | struct drm_master *master; | |
93 | ||
9a298b2a | 94 | master = kzalloc(sizeof(*master), GFP_KERNEL); |
7c1c2871 DA |
95 | if (!master) |
96 | return NULL; | |
97 | ||
98 | kref_init(&master->refcount); | |
99 | spin_lock_init(&master->lock.spinlock); | |
100 | init_waitqueue_head(&master->lock.lock_queue); | |
32e7b94a | 101 | idr_init(&master->magic_map); |
7c1c2871 DA |
102 | master->minor = minor; |
103 | ||
7c1c2871 DA |
104 | return master; |
105 | } | |
106 | ||
107 | struct drm_master *drm_master_get(struct drm_master *master) | |
108 | { | |
109 | kref_get(&master->refcount); | |
110 | return master; | |
111 | } | |
85bb0c37 | 112 | EXPORT_SYMBOL(drm_master_get); |
7c1c2871 DA |
113 | |
114 | static void drm_master_destroy(struct kref *kref) | |
115 | { | |
116 | struct drm_master *master = container_of(kref, struct drm_master, refcount); | |
7c1c2871 | 117 | struct drm_device *dev = master->minor->dev; |
c1ff85d9 | 118 | struct drm_map_list *r_list, *list_temp; |
7c1c2871 | 119 | |
c996fd0b | 120 | mutex_lock(&dev->struct_mutex); |
7c1c2871 DA |
121 | if (dev->driver->master_destroy) |
122 | dev->driver->master_destroy(dev, master); | |
123 | ||
c1ff85d9 DA |
124 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) { |
125 | if (r_list->master == master) { | |
9fc5cde7 | 126 | drm_legacy_rmmap_locked(dev, r_list->map); |
c1ff85d9 DA |
127 | r_list = NULL; |
128 | } | |
129 | } | |
c996fd0b | 130 | mutex_unlock(&dev->struct_mutex); |
32e7b94a DH |
131 | |
132 | idr_destroy(&master->magic_map); | |
4a324d33 | 133 | kfree(master->unique); |
9a298b2a | 134 | kfree(master); |
7c1c2871 DA |
135 | } |
136 | ||
137 | void drm_master_put(struct drm_master **master) | |
138 | { | |
139 | kref_put(&(*master)->refcount, drm_master_destroy); | |
140 | *master = NULL; | |
141 | } | |
85bb0c37 | 142 | EXPORT_SYMBOL(drm_master_put); |
7c1c2871 DA |
143 | |
144 | int drm_setmaster_ioctl(struct drm_device *dev, void *data, | |
145 | struct drm_file *file_priv) | |
146 | { | |
53ef1600 | 147 | int ret = 0; |
862302ff | 148 | |
c996fd0b | 149 | mutex_lock(&dev->master_mutex); |
7963e9db | 150 | if (file_priv->is_master) |
c996fd0b | 151 | goto out_unlock; |
7c1c2871 | 152 | |
c996fd0b TH |
153 | if (file_priv->minor->master) { |
154 | ret = -EINVAL; | |
155 | goto out_unlock; | |
156 | } | |
7c1c2871 | 157 | |
c996fd0b TH |
158 | if (!file_priv->master) { |
159 | ret = -EINVAL; | |
160 | goto out_unlock; | |
161 | } | |
08bec5b4 | 162 | |
a0af2e53 TH |
163 | if (!file_priv->allowed_master) { |
164 | ret = drm_new_set_master(dev, file_priv); | |
165 | goto out_unlock; | |
166 | } | |
167 | ||
08bec5b4 | 168 | file_priv->minor->master = drm_master_get(file_priv->master); |
7963e9db | 169 | file_priv->is_master = 1; |
08bec5b4 DH |
170 | if (dev->driver->master_set) { |
171 | ret = dev->driver->master_set(dev, file_priv, false); | |
7963e9db DA |
172 | if (unlikely(ret != 0)) { |
173 | file_priv->is_master = 0; | |
08bec5b4 | 174 | drm_master_put(&file_priv->minor->master); |
7963e9db | 175 | } |
7c1c2871 DA |
176 | } |
177 | ||
c996fd0b TH |
178 | out_unlock: |
179 | mutex_unlock(&dev->master_mutex); | |
53ef1600 | 180 | return ret; |
7c1c2871 DA |
181 | } |
182 | ||
183 | int drm_dropmaster_ioctl(struct drm_device *dev, void *data, | |
184 | struct drm_file *file_priv) | |
185 | { | |
c996fd0b TH |
186 | int ret = -EINVAL; |
187 | ||
188 | mutex_lock(&dev->master_mutex); | |
7963e9db | 189 | if (!file_priv->is_master) |
c996fd0b | 190 | goto out_unlock; |
6b008426 | 191 | |
07f1c7a7 | 192 | if (!file_priv->minor->master) |
c996fd0b | 193 | goto out_unlock; |
07f1c7a7 | 194 | |
c996fd0b | 195 | ret = 0; |
862302ff TH |
196 | if (dev->driver->master_drop) |
197 | dev->driver->master_drop(dev, file_priv, false); | |
7c1c2871 | 198 | drm_master_put(&file_priv->minor->master); |
7963e9db | 199 | file_priv->is_master = 0; |
c996fd0b TH |
200 | |
201 | out_unlock: | |
202 | mutex_unlock(&dev->master_mutex); | |
203 | return ret; | |
7c1c2871 DA |
204 | } |
205 | ||
0d639883 DH |
206 | /* |
207 | * DRM Minors | |
208 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
209 | * of them is represented by a drm_minor object. Depending on the capabilities | |
210 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 211 | * |
0d639883 DH |
212 | * Minors can be accessed via dev->$minor_name. This pointer is either |
213 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
214 | * valid. This means, DRM minors have the same life-time as the underlying | |
215 | * device. However, this doesn't mean that the minor is active. Minors are | |
216 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 217 | */ |
0d639883 | 218 | |
05b701f6 DH |
219 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
220 | unsigned int type) | |
221 | { | |
222 | switch (type) { | |
223 | case DRM_MINOR_LEGACY: | |
224 | return &dev->primary; | |
225 | case DRM_MINOR_RENDER: | |
226 | return &dev->render; | |
227 | case DRM_MINOR_CONTROL: | |
228 | return &dev->control; | |
229 | default: | |
230 | return NULL; | |
231 | } | |
232 | } | |
233 | ||
234 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
235 | { | |
236 | struct drm_minor *minor; | |
f1b85962 DH |
237 | unsigned long flags; |
238 | int r; | |
05b701f6 DH |
239 | |
240 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
241 | if (!minor) | |
242 | return -ENOMEM; | |
243 | ||
244 | minor->type = type; | |
245 | minor->dev = dev; | |
05b701f6 | 246 | |
f1b85962 DH |
247 | idr_preload(GFP_KERNEL); |
248 | spin_lock_irqsave(&drm_minor_lock, flags); | |
249 | r = idr_alloc(&drm_minors_idr, | |
250 | NULL, | |
251 | 64 * type, | |
252 | 64 * (type + 1), | |
253 | GFP_NOWAIT); | |
254 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
255 | idr_preload_end(); | |
256 | ||
257 | if (r < 0) | |
258 | goto err_free; | |
259 | ||
260 | minor->index = r; | |
261 | ||
e1728075 DH |
262 | minor->kdev = drm_sysfs_minor_alloc(minor); |
263 | if (IS_ERR(minor->kdev)) { | |
264 | r = PTR_ERR(minor->kdev); | |
265 | goto err_index; | |
266 | } | |
267 | ||
05b701f6 DH |
268 | *drm_minor_get_slot(dev, type) = minor; |
269 | return 0; | |
f1b85962 | 270 | |
e1728075 DH |
271 | err_index: |
272 | spin_lock_irqsave(&drm_minor_lock, flags); | |
273 | idr_remove(&drm_minors_idr, minor->index); | |
274 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
275 | err_free: |
276 | kfree(minor); | |
277 | return r; | |
05b701f6 DH |
278 | } |
279 | ||
bd9dfa98 DH |
280 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
281 | { | |
f1b85962 DH |
282 | struct drm_minor **slot, *minor; |
283 | unsigned long flags; | |
bd9dfa98 DH |
284 | |
285 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
286 | minor = *slot; |
287 | if (!minor) | |
288 | return; | |
289 | ||
e1728075 | 290 | put_device(minor->kdev); |
f1b85962 DH |
291 | |
292 | spin_lock_irqsave(&drm_minor_lock, flags); | |
293 | idr_remove(&drm_minors_idr, minor->index); | |
294 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
295 | ||
296 | kfree(minor); | |
297 | *slot = NULL; | |
bd9dfa98 DH |
298 | } |
299 | ||
afcdbc86 | 300 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 301 | { |
f1b85962 | 302 | struct drm_minor *minor; |
0d639883 | 303 | unsigned long flags; |
1da177e4 | 304 | int ret; |
1da177e4 LT |
305 | |
306 | DRM_DEBUG("\n"); | |
307 | ||
f1b85962 DH |
308 | minor = *drm_minor_get_slot(dev, type); |
309 | if (!minor) | |
05b701f6 DH |
310 | return 0; |
311 | ||
f1b85962 | 312 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 313 | if (ret) { |
156f5a78 | 314 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
f1b85962 | 315 | return ret; |
955b12de | 316 | } |
2c14f28b | 317 | |
e1728075 DH |
318 | ret = device_add(minor->kdev); |
319 | if (ret) | |
cb6458f9 | 320 | goto err_debugfs; |
2c14f28b | 321 | |
0d639883 DH |
322 | /* replace NULL with @minor so lookups will succeed from now on */ |
323 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 324 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 325 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 326 | |
f1b85962 | 327 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
328 | return 0; |
329 | ||
cb6458f9 | 330 | err_debugfs: |
f1b85962 | 331 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
332 | return ret; |
333 | } | |
b5e89ed5 | 334 | |
afcdbc86 | 335 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 336 | { |
afcdbc86 | 337 | struct drm_minor *minor; |
0d639883 | 338 | unsigned long flags; |
afcdbc86 DH |
339 | |
340 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 341 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
342 | return; |
343 | ||
f1b85962 | 344 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 345 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 346 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 347 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 348 | |
e1728075 DH |
349 | device_del(minor->kdev); |
350 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 351 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
352 | } |
353 | ||
354 | /** | |
1616c525 DH |
355 | * drm_minor_acquire - Acquire a DRM minor |
356 | * @minor_id: Minor ID of the DRM-minor | |
357 | * | |
358 | * Looks up the given minor-ID and returns the respective DRM-minor object. The | |
359 | * refence-count of the underlying device is increased so you must release this | |
360 | * object with drm_minor_release(). | |
361 | * | |
362 | * As long as you hold this minor, it is guaranteed that the object and the | |
363 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
364 | * unregistered while you hold the minor. | |
f73aca50 | 365 | * |
1616c525 DH |
366 | * Returns: |
367 | * Pointer to minor-object with increased device-refcount, or PTR_ERR on | |
368 | * failure. | |
1da177e4 | 369 | */ |
1616c525 | 370 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 371 | { |
1616c525 | 372 | struct drm_minor *minor; |
0d639883 | 373 | unsigned long flags; |
1616c525 | 374 | |
0d639883 | 375 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 376 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 DH |
377 | if (minor) |
378 | drm_dev_ref(minor->dev); | |
379 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
380 | ||
381 | if (!minor) { | |
382 | return ERR_PTR(-ENODEV); | |
383 | } else if (drm_device_is_unplugged(minor->dev)) { | |
384 | drm_dev_unref(minor->dev); | |
1616c525 | 385 | return ERR_PTR(-ENODEV); |
0d639883 | 386 | } |
673a394b | 387 | |
1616c525 DH |
388 | return minor; |
389 | } | |
b5e89ed5 | 390 | |
1616c525 DH |
391 | /** |
392 | * drm_minor_release - Release DRM minor | |
393 | * @minor: Pointer to DRM minor object | |
394 | * | |
395 | * Release a minor that was previously acquired via drm_minor_acquire(). | |
396 | */ | |
397 | void drm_minor_release(struct drm_minor *minor) | |
398 | { | |
399 | drm_dev_unref(minor->dev); | |
1da177e4 | 400 | } |
112b715e | 401 | |
6e3f797c DV |
402 | /** |
403 | * DOC: driver instance overview | |
404 | * | |
405 | * A device instance for a drm driver is represented by struct &drm_device. This | |
406 | * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() | |
407 | * callbacks implemented by the driver. The driver then needs to initialize all | |
408 | * the various subsystems for the drm device like memory management, vblank | |
409 | * handling, modesetting support and intial output configuration plus obviously | |
410 | * initialize all the corresponding hardware bits. An important part of this is | |
411 | * also calling drm_dev_set_unique() to set the userspace-visible unique name of | |
412 | * this device instance. Finally when everything is up and running and ready for | |
413 | * userspace the device instance can be published using drm_dev_register(). | |
414 | * | |
415 | * There is also deprecated support for initalizing device instances using | |
416 | * bus-specific helpers and the ->load() callback. But due to | |
417 | * backwards-compatibility needs the device instance have to be published too | |
418 | * early, which requires unpretty global locking to make safe and is therefore | |
419 | * only support for existing drivers not yet converted to the new scheme. | |
420 | * | |
421 | * When cleaning up a device instance everything needs to be done in reverse: | |
422 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
423 | * any other resources allocated at device initialization and drop the driver's | |
424 | * reference to &drm_device using drm_dev_unref(). | |
425 | * | |
426 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
427 | * historical baggage. Hence use the reference counting provided by | |
428 | * drm_dev_ref() and drm_dev_unref() only carefully. | |
429 | * | |
430 | * Also note that embedding of &drm_device is currently not (yet) supported (but | |
431 | * it would be easy to add). Drivers can store driver-private data in the | |
432 | * dev_priv field of &drm_device. | |
433 | */ | |
434 | ||
112b715e | 435 | /** |
c6a1af8a TR |
436 | * drm_put_dev - Unregister and release a DRM device |
437 | * @dev: DRM device | |
112b715e | 438 | * |
c6a1af8a | 439 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 440 | * |
c6a1af8a | 441 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
442 | * |
443 | * Note: Use of this function is deprecated. It will eventually go away | |
444 | * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly | |
445 | * instead to make sure that the device isn't userspace accessible any more | |
446 | * while teardown is in progress, ensuring that userspace can't access an | |
447 | * inconsistent state. | |
112b715e KH |
448 | */ |
449 | void drm_put_dev(struct drm_device *dev) | |
450 | { | |
112b715e KH |
451 | DRM_DEBUG("\n"); |
452 | ||
453 | if (!dev) { | |
454 | DRM_ERROR("cleanup called no dev\n"); | |
455 | return; | |
456 | } | |
457 | ||
c3a49737 | 458 | drm_dev_unregister(dev); |
099d1c29 | 459 | drm_dev_unref(dev); |
112b715e KH |
460 | } |
461 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
462 | |
463 | void drm_unplug_dev(struct drm_device *dev) | |
464 | { | |
465 | /* for a USB device */ | |
afcdbc86 DH |
466 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
467 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
468 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
2c07a21d DA |
469 | |
470 | mutex_lock(&drm_global_mutex); | |
471 | ||
472 | drm_device_set_unplugged(dev); | |
473 | ||
474 | if (dev->open_count == 0) { | |
475 | drm_put_dev(dev); | |
476 | } | |
477 | mutex_unlock(&drm_global_mutex); | |
478 | } | |
479 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 480 | |
31bbe16f DH |
481 | /* |
482 | * DRM internal mount | |
483 | * We want to be able to allocate our own "struct address_space" to control | |
484 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
485 | * stand-alone address_space objects, so we need an underlying inode. As there | |
486 | * is no way to allocate an independent inode easily, we need a fake internal | |
487 | * VFS mount-point. | |
488 | * | |
489 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
490 | * frees it again. You are allowed to use iget() and iput() to get references to | |
491 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
492 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
493 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
494 | * between multiple inode-users. You could, technically, call | |
495 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
496 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
497 | */ | |
498 | ||
499 | static int drm_fs_cnt; | |
500 | static struct vfsmount *drm_fs_mnt; | |
501 | ||
502 | static const struct dentry_operations drm_fs_dops = { | |
503 | .d_dname = simple_dname, | |
504 | }; | |
505 | ||
506 | static const struct super_operations drm_fs_sops = { | |
507 | .statfs = simple_statfs, | |
508 | }; | |
509 | ||
510 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
511 | const char *dev_name, void *data) | |
512 | { | |
513 | return mount_pseudo(fs_type, | |
514 | "drm:", | |
515 | &drm_fs_sops, | |
516 | &drm_fs_dops, | |
517 | 0x010203ff); | |
518 | } | |
519 | ||
520 | static struct file_system_type drm_fs_type = { | |
521 | .name = "drm", | |
522 | .owner = THIS_MODULE, | |
523 | .mount = drm_fs_mount, | |
524 | .kill_sb = kill_anon_super, | |
525 | }; | |
526 | ||
527 | static struct inode *drm_fs_inode_new(void) | |
528 | { | |
529 | struct inode *inode; | |
530 | int r; | |
531 | ||
532 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
533 | if (r < 0) { | |
534 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
535 | return ERR_PTR(r); | |
536 | } | |
537 | ||
538 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
539 | if (IS_ERR(inode)) | |
540 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
541 | ||
542 | return inode; | |
543 | } | |
544 | ||
545 | static void drm_fs_inode_free(struct inode *inode) | |
546 | { | |
547 | if (inode) { | |
548 | iput(inode); | |
549 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
550 | } | |
551 | } | |
552 | ||
1bb72532 | 553 | /** |
c6a1af8a | 554 | * drm_dev_alloc - Allocate new DRM device |
1bb72532 DH |
555 | * @driver: DRM driver to allocate device for |
556 | * @parent: Parent device object | |
557 | * | |
558 | * Allocate and initialize a new DRM device. No device registration is done. | |
c22f0ace | 559 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
560 | * with other core subsystems. This should be done last in the device |
561 | * initialization sequence to make sure userspace can't access an inconsistent | |
562 | * state. | |
1bb72532 | 563 | * |
099d1c29 DH |
564 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
565 | * drm_dev_unref() to take and drop further ref-counts. | |
566 | * | |
b0ff4b93 DV |
567 | * Note that for purely virtual devices @parent can be NULL. |
568 | * | |
1bb72532 DH |
569 | * RETURNS: |
570 | * Pointer to new DRM device, or NULL if out of memory. | |
571 | */ | |
572 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
573 | struct device *parent) | |
574 | { | |
575 | struct drm_device *dev; | |
576 | int ret; | |
577 | ||
578 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
579 | if (!dev) | |
580 | return NULL; | |
581 | ||
099d1c29 | 582 | kref_init(&dev->ref); |
1bb72532 DH |
583 | dev->dev = parent; |
584 | dev->driver = driver; | |
585 | ||
586 | INIT_LIST_HEAD(&dev->filelist); | |
587 | INIT_LIST_HEAD(&dev->ctxlist); | |
588 | INIT_LIST_HEAD(&dev->vmalist); | |
589 | INIT_LIST_HEAD(&dev->maplist); | |
590 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
591 | ||
2177a218 | 592 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
593 | spin_lock_init(&dev->event_lock); |
594 | mutex_init(&dev->struct_mutex); | |
595 | mutex_init(&dev->ctxlist_mutex); | |
c996fd0b | 596 | mutex_init(&dev->master_mutex); |
1bb72532 | 597 | |
6796cb16 DH |
598 | dev->anon_inode = drm_fs_inode_new(); |
599 | if (IS_ERR(dev->anon_inode)) { | |
600 | ret = PTR_ERR(dev->anon_inode); | |
601 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 602 | goto err_free; |
6796cb16 DH |
603 | } |
604 | ||
05b701f6 DH |
605 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
606 | ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); | |
607 | if (ret) | |
608 | goto err_minors; | |
bcfe0c09 GP |
609 | |
610 | WARN_ON(driver->suspend || driver->resume); | |
05b701f6 DH |
611 | } |
612 | ||
6d6dfcfb | 613 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
614 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
615 | if (ret) | |
616 | goto err_minors; | |
617 | } | |
618 | ||
619 | ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY); | |
620 | if (ret) | |
621 | goto err_minors; | |
622 | ||
6796cb16 | 623 | if (drm_ht_create(&dev->map_hash, 12)) |
05b701f6 | 624 | goto err_minors; |
1bb72532 | 625 | |
ba6976c1 | 626 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 627 | |
1bcecfac | 628 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
629 | ret = drm_gem_init(dev); |
630 | if (ret) { | |
631 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
632 | goto err_ctxbitmap; | |
633 | } | |
634 | } | |
635 | ||
636 | return dev; | |
637 | ||
638 | err_ctxbitmap: | |
e7b96070 | 639 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 640 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 641 | err_minors: |
bd9dfa98 DH |
642 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
643 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
644 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 645 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 646 | err_free: |
c996fd0b | 647 | mutex_destroy(&dev->master_mutex); |
1bb72532 DH |
648 | kfree(dev); |
649 | return NULL; | |
650 | } | |
651 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 652 | |
099d1c29 | 653 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 654 | { |
099d1c29 | 655 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 656 | |
1bcecfac | 657 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
0dc8fe59 DH |
658 | drm_gem_destroy(dev); |
659 | ||
e7b96070 | 660 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 661 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 662 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 663 | |
bd9dfa98 DH |
664 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
665 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
666 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
667 | ||
c996fd0b | 668 | mutex_destroy(&dev->master_mutex); |
ca8e2ad7 | 669 | kfree(dev->unique); |
0dc8fe59 DH |
670 | kfree(dev); |
671 | } | |
099d1c29 DH |
672 | |
673 | /** | |
674 | * drm_dev_ref - Take reference of a DRM device | |
675 | * @dev: device to take reference of or NULL | |
676 | * | |
677 | * This increases the ref-count of @dev by one. You *must* already own a | |
678 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
679 | * again. | |
680 | * | |
681 | * This function never fails. However, this function does not provide *any* | |
682 | * guarantee whether the device is alive or running. It only provides a | |
683 | * reference to the object and the memory associated with it. | |
684 | */ | |
685 | void drm_dev_ref(struct drm_device *dev) | |
686 | { | |
687 | if (dev) | |
688 | kref_get(&dev->ref); | |
689 | } | |
690 | EXPORT_SYMBOL(drm_dev_ref); | |
691 | ||
692 | /** | |
693 | * drm_dev_unref - Drop reference of a DRM device | |
694 | * @dev: device to drop reference of or NULL | |
695 | * | |
696 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
697 | * ref-count drops to zero. | |
698 | */ | |
699 | void drm_dev_unref(struct drm_device *dev) | |
700 | { | |
701 | if (dev) | |
702 | kref_put(&dev->ref, drm_dev_release); | |
703 | } | |
704 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 705 | |
c22f0ace DH |
706 | /** |
707 | * drm_dev_register - Register DRM device | |
708 | * @dev: Device to register | |
c6a1af8a | 709 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
710 | * |
711 | * Register the DRM device @dev with the system, advertise device to user-space | |
712 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
713 | * previously. | |
714 | * | |
715 | * Never call this twice on any device! | |
716 | * | |
6e3f797c DV |
717 | * NOTE: To ensure backward compatibility with existing drivers method this |
718 | * function calls the ->load() method after registering the device nodes, | |
719 | * creating race conditions. Usage of the ->load() methods is therefore | |
720 | * deprecated, drivers must perform all initialization before calling | |
721 | * drm_dev_register(). | |
722 | * | |
c22f0ace DH |
723 | * RETURNS: |
724 | * 0 on success, negative error code on failure. | |
725 | */ | |
726 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
727 | { | |
728 | int ret; | |
729 | ||
730 | mutex_lock(&drm_global_mutex); | |
731 | ||
afcdbc86 | 732 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
733 | if (ret) |
734 | goto err_minors; | |
c22f0ace | 735 | |
afcdbc86 | 736 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
737 | if (ret) |
738 | goto err_minors; | |
c22f0ace | 739 | |
afcdbc86 | 740 | ret = drm_minor_register(dev, DRM_MINOR_LEGACY); |
c22f0ace | 741 | if (ret) |
05b701f6 | 742 | goto err_minors; |
c22f0ace DH |
743 | |
744 | if (dev->driver->load) { | |
745 | ret = dev->driver->load(dev, flags); | |
746 | if (ret) | |
05b701f6 | 747 | goto err_minors; |
c22f0ace DH |
748 | } |
749 | ||
c22f0ace DH |
750 | ret = 0; |
751 | goto out_unlock; | |
752 | ||
05b701f6 | 753 | err_minors: |
afcdbc86 DH |
754 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
755 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
756 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
757 | out_unlock: |
758 | mutex_unlock(&drm_global_mutex); | |
759 | return ret; | |
760 | } | |
761 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
762 | |
763 | /** | |
764 | * drm_dev_unregister - Unregister DRM device | |
765 | * @dev: Device to unregister | |
766 | * | |
767 | * Unregister the DRM device from the system. This does the reverse of | |
768 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 769 | * drm_dev_unref() to drop their final reference. |
6e3f797c DV |
770 | * |
771 | * This should be called first in the device teardown code to make sure | |
772 | * userspace can't access the device instance any more. | |
c3a49737 DH |
773 | */ |
774 | void drm_dev_unregister(struct drm_device *dev) | |
775 | { | |
776 | struct drm_map_list *r_list, *list_temp; | |
777 | ||
778 | drm_lastclose(dev); | |
779 | ||
780 | if (dev->driver->unload) | |
781 | dev->driver->unload(dev); | |
782 | ||
4efafebe DV |
783 | if (dev->agp) |
784 | drm_pci_agp_destroy(dev); | |
c3a49737 DH |
785 | |
786 | drm_vblank_cleanup(dev); | |
787 | ||
788 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) | |
9fc5cde7 | 789 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 790 | |
afcdbc86 DH |
791 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
792 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
793 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
794 | } |
795 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 TR |
796 | |
797 | /** | |
798 | * drm_dev_set_unique - Set the unique name of a DRM device | |
799 | * @dev: device of which to set the unique name | |
800 | * @fmt: format string for unique name | |
801 | * | |
802 | * Sets the unique name of a DRM device using the specified format string and | |
803 | * a variable list of arguments. Drivers can use this at driver probe time if | |
804 | * the unique name of the devices they drive is static. | |
805 | * | |
806 | * Return: 0 on success or a negative error code on failure. | |
807 | */ | |
808 | int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...) | |
809 | { | |
810 | va_list ap; | |
811 | ||
812 | kfree(dev->unique); | |
813 | ||
814 | va_start(ap, fmt); | |
815 | dev->unique = kvasprintf(GFP_KERNEL, fmt, ap); | |
816 | va_end(ap); | |
817 | ||
818 | return dev->unique ? 0 : -ENOMEM; | |
819 | } | |
820 | EXPORT_SYMBOL(drm_dev_set_unique); | |
1b7199fe DH |
821 | |
822 | /* | |
823 | * DRM Core | |
824 | * The DRM core module initializes all global DRM objects and makes them | |
825 | * available to drivers. Once setup, drivers can probe their respective | |
826 | * devices. | |
827 | * Currently, core management includes: | |
828 | * - The "DRM-Global" key/value database | |
829 | * - Global ID management for connectors | |
830 | * - DRM major number allocation | |
831 | * - DRM minor management | |
832 | * - DRM sysfs class | |
833 | * - DRM debugfs root | |
834 | * | |
835 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
836 | * interface registered on a DRM device, you can request minor numbers from DRM | |
837 | * core. DRM core takes care of major-number management and char-dev | |
838 | * registration. A stub ->open() callback forwards any open() requests to the | |
839 | * registered minor. | |
840 | */ | |
841 | ||
842 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
843 | { | |
844 | const struct file_operations *new_fops; | |
845 | struct drm_minor *minor; | |
846 | int err; | |
847 | ||
848 | DRM_DEBUG("\n"); | |
849 | ||
850 | mutex_lock(&drm_global_mutex); | |
851 | minor = drm_minor_acquire(iminor(inode)); | |
852 | if (IS_ERR(minor)) { | |
853 | err = PTR_ERR(minor); | |
854 | goto out_unlock; | |
855 | } | |
856 | ||
857 | new_fops = fops_get(minor->dev->driver->fops); | |
858 | if (!new_fops) { | |
859 | err = -ENODEV; | |
860 | goto out_release; | |
861 | } | |
862 | ||
863 | replace_fops(filp, new_fops); | |
864 | if (filp->f_op->open) | |
865 | err = filp->f_op->open(inode, filp); | |
866 | else | |
867 | err = 0; | |
868 | ||
869 | out_release: | |
870 | drm_minor_release(minor); | |
871 | out_unlock: | |
872 | mutex_unlock(&drm_global_mutex); | |
873 | return err; | |
874 | } | |
875 | ||
876 | static const struct file_operations drm_stub_fops = { | |
877 | .owner = THIS_MODULE, | |
878 | .open = drm_stub_open, | |
879 | .llseek = noop_llseek, | |
880 | }; | |
881 | ||
882 | static int __init drm_core_init(void) | |
883 | { | |
884 | int ret = -ENOMEM; | |
885 | ||
886 | drm_global_init(); | |
887 | drm_connector_ida_init(); | |
888 | idr_init(&drm_minors_idr); | |
889 | ||
890 | if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) | |
891 | goto err_p1; | |
892 | ||
fcc90213 DH |
893 | ret = drm_sysfs_init(); |
894 | if (ret < 0) { | |
1b7199fe | 895 | printk(KERN_ERR "DRM: Error creating drm class.\n"); |
1b7199fe DH |
896 | goto err_p2; |
897 | } | |
898 | ||
899 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
900 | if (!drm_debugfs_root) { | |
901 | DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); | |
902 | ret = -1; | |
903 | goto err_p3; | |
904 | } | |
905 | ||
906 | DRM_INFO("Initialized %s %d.%d.%d %s\n", | |
907 | CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); | |
908 | return 0; | |
909 | err_p3: | |
910 | drm_sysfs_destroy(); | |
911 | err_p2: | |
912 | unregister_chrdev(DRM_MAJOR, "drm"); | |
913 | ||
914 | idr_destroy(&drm_minors_idr); | |
915 | err_p1: | |
916 | return ret; | |
917 | } | |
918 | ||
919 | static void __exit drm_core_exit(void) | |
920 | { | |
921 | debugfs_remove(drm_debugfs_root); | |
922 | drm_sysfs_destroy(); | |
923 | ||
924 | unregister_chrdev(DRM_MAJOR, "drm"); | |
925 | ||
926 | drm_connector_ida_destroy(); | |
927 | idr_destroy(&drm_minors_idr); | |
928 | } | |
929 | ||
930 | module_init(drm_core_init); | |
931 | module_exit(drm_core_exit); |