Commit | Line | Data |
---|---|---|
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 | |
6dc3e22e EG |
40 | /* |
41 | * drm_debug: Enable debug output. | |
42 | * Bitmask of DRM_UT_x. See include/drm/drmP.h for details. | |
43 | */ | |
44 | unsigned int drm_debug = 0; | |
1da177e4 LT |
45 | EXPORT_SYMBOL(drm_debug); |
46 | ||
b5e89ed5 DA |
47 | MODULE_AUTHOR(CORE_AUTHOR); |
48 | MODULE_DESCRIPTION(CORE_DESC); | |
1da177e4 | 49 | MODULE_LICENSE("GPL and additional rights"); |
6dc3e22e EG |
50 | MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n" |
51 | "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n" | |
52 | "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n" | |
53 | "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n" | |
54 | "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n" | |
55 | "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n" | |
56 | "\t\tBit 5 (0x20) will enable VBL messages (vblank code)"); | |
c0758146 | 57 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 58 | |
0d639883 | 59 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 60 | static struct idr drm_minors_idr; |
2c14f28b | 61 | |
1b7199fe | 62 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 63 | |
a1f1a79c | 64 | void drm_err(const char *format, ...) |
5ad3d883 JP |
65 | { |
66 | struct va_format vaf; | |
67 | va_list args; | |
5ad3d883 JP |
68 | |
69 | va_start(args, format); | |
70 | ||
71 | vaf.fmt = format; | |
72 | vaf.va = &args; | |
73 | ||
2ee762b3 | 74 | printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV", |
a1f1a79c | 75 | __builtin_return_address(0), &vaf); |
5ad3d883 JP |
76 | |
77 | va_end(args); | |
5ad3d883 JP |
78 | } |
79 | EXPORT_SYMBOL(drm_err); | |
80 | ||
1287aa90 | 81 | void drm_ut_debug_printk(const char *function_name, const char *format, ...) |
4fefcb27 | 82 | { |
fffb9065 | 83 | struct va_format vaf; |
4fefcb27 | 84 | va_list args; |
1da177e4 | 85 | |
a73d4e91 LD |
86 | va_start(args, format); |
87 | vaf.fmt = format; | |
88 | vaf.va = &args; | |
89 | ||
0ed02983 | 90 | printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf); |
a73d4e91 LD |
91 | |
92 | va_end(args); | |
4fefcb27 | 93 | } |
94 | EXPORT_SYMBOL(drm_ut_debug_printk); | |
5ad3d883 | 95 | |
7c1c2871 DA |
96 | struct drm_master *drm_master_create(struct drm_minor *minor) |
97 | { | |
98 | struct drm_master *master; | |
99 | ||
9a298b2a | 100 | master = kzalloc(sizeof(*master), GFP_KERNEL); |
7c1c2871 DA |
101 | if (!master) |
102 | return NULL; | |
103 | ||
104 | kref_init(&master->refcount); | |
105 | spin_lock_init(&master->lock.spinlock); | |
106 | init_waitqueue_head(&master->lock.lock_queue); | |
32e7b94a | 107 | idr_init(&master->magic_map); |
7c1c2871 DA |
108 | master->minor = minor; |
109 | ||
7c1c2871 DA |
110 | return master; |
111 | } | |
112 | ||
113 | struct drm_master *drm_master_get(struct drm_master *master) | |
114 | { | |
115 | kref_get(&master->refcount); | |
116 | return master; | |
117 | } | |
85bb0c37 | 118 | EXPORT_SYMBOL(drm_master_get); |
7c1c2871 DA |
119 | |
120 | static void drm_master_destroy(struct kref *kref) | |
121 | { | |
122 | struct drm_master *master = container_of(kref, struct drm_master, refcount); | |
7c1c2871 | 123 | struct drm_device *dev = master->minor->dev; |
c1ff85d9 | 124 | struct drm_map_list *r_list, *list_temp; |
7c1c2871 | 125 | |
c996fd0b | 126 | mutex_lock(&dev->struct_mutex); |
7c1c2871 DA |
127 | if (dev->driver->master_destroy) |
128 | dev->driver->master_destroy(dev, master); | |
129 | ||
c1ff85d9 DA |
130 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) { |
131 | if (r_list->master == master) { | |
9fc5cde7 | 132 | drm_legacy_rmmap_locked(dev, r_list->map); |
c1ff85d9 DA |
133 | r_list = NULL; |
134 | } | |
135 | } | |
c996fd0b | 136 | mutex_unlock(&dev->struct_mutex); |
32e7b94a DH |
137 | |
138 | idr_destroy(&master->magic_map); | |
4a324d33 | 139 | kfree(master->unique); |
9a298b2a | 140 | kfree(master); |
7c1c2871 DA |
141 | } |
142 | ||
143 | void drm_master_put(struct drm_master **master) | |
144 | { | |
145 | kref_put(&(*master)->refcount, drm_master_destroy); | |
146 | *master = NULL; | |
147 | } | |
85bb0c37 | 148 | EXPORT_SYMBOL(drm_master_put); |
7c1c2871 DA |
149 | |
150 | int drm_setmaster_ioctl(struct drm_device *dev, void *data, | |
151 | struct drm_file *file_priv) | |
152 | { | |
53ef1600 | 153 | int ret = 0; |
862302ff | 154 | |
c996fd0b | 155 | mutex_lock(&dev->master_mutex); |
7963e9db | 156 | if (file_priv->is_master) |
c996fd0b | 157 | goto out_unlock; |
7c1c2871 | 158 | |
c996fd0b TH |
159 | if (file_priv->minor->master) { |
160 | ret = -EINVAL; | |
161 | goto out_unlock; | |
162 | } | |
7c1c2871 | 163 | |
c996fd0b TH |
164 | if (!file_priv->master) { |
165 | ret = -EINVAL; | |
166 | goto out_unlock; | |
167 | } | |
08bec5b4 | 168 | |
a0af2e53 TH |
169 | if (!file_priv->allowed_master) { |
170 | ret = drm_new_set_master(dev, file_priv); | |
171 | goto out_unlock; | |
172 | } | |
173 | ||
08bec5b4 | 174 | file_priv->minor->master = drm_master_get(file_priv->master); |
7963e9db | 175 | file_priv->is_master = 1; |
08bec5b4 DH |
176 | if (dev->driver->master_set) { |
177 | ret = dev->driver->master_set(dev, file_priv, false); | |
7963e9db DA |
178 | if (unlikely(ret != 0)) { |
179 | file_priv->is_master = 0; | |
08bec5b4 | 180 | drm_master_put(&file_priv->minor->master); |
7963e9db | 181 | } |
7c1c2871 DA |
182 | } |
183 | ||
c996fd0b TH |
184 | out_unlock: |
185 | mutex_unlock(&dev->master_mutex); | |
53ef1600 | 186 | return ret; |
7c1c2871 DA |
187 | } |
188 | ||
189 | int drm_dropmaster_ioctl(struct drm_device *dev, void *data, | |
190 | struct drm_file *file_priv) | |
191 | { | |
c996fd0b TH |
192 | int ret = -EINVAL; |
193 | ||
194 | mutex_lock(&dev->master_mutex); | |
7963e9db | 195 | if (!file_priv->is_master) |
c996fd0b | 196 | goto out_unlock; |
6b008426 | 197 | |
07f1c7a7 | 198 | if (!file_priv->minor->master) |
c996fd0b | 199 | goto out_unlock; |
07f1c7a7 | 200 | |
c996fd0b | 201 | ret = 0; |
862302ff TH |
202 | if (dev->driver->master_drop) |
203 | dev->driver->master_drop(dev, file_priv, false); | |
7c1c2871 | 204 | drm_master_put(&file_priv->minor->master); |
7963e9db | 205 | file_priv->is_master = 0; |
c996fd0b TH |
206 | |
207 | out_unlock: | |
208 | mutex_unlock(&dev->master_mutex); | |
209 | return ret; | |
7c1c2871 DA |
210 | } |
211 | ||
0d639883 DH |
212 | /* |
213 | * DRM Minors | |
214 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
215 | * of them is represented by a drm_minor object. Depending on the capabilities | |
216 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 217 | * |
0d639883 DH |
218 | * Minors can be accessed via dev->$minor_name. This pointer is either |
219 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
220 | * valid. This means, DRM minors have the same life-time as the underlying | |
221 | * device. However, this doesn't mean that the minor is active. Minors are | |
222 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 223 | */ |
0d639883 | 224 | |
05b701f6 DH |
225 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
226 | unsigned int type) | |
227 | { | |
228 | switch (type) { | |
229 | case DRM_MINOR_LEGACY: | |
230 | return &dev->primary; | |
231 | case DRM_MINOR_RENDER: | |
232 | return &dev->render; | |
233 | case DRM_MINOR_CONTROL: | |
234 | return &dev->control; | |
235 | default: | |
236 | return NULL; | |
237 | } | |
238 | } | |
239 | ||
240 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
241 | { | |
242 | struct drm_minor *minor; | |
f1b85962 DH |
243 | unsigned long flags; |
244 | int r; | |
05b701f6 DH |
245 | |
246 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
247 | if (!minor) | |
248 | return -ENOMEM; | |
249 | ||
250 | minor->type = type; | |
251 | minor->dev = dev; | |
05b701f6 | 252 | |
f1b85962 DH |
253 | idr_preload(GFP_KERNEL); |
254 | spin_lock_irqsave(&drm_minor_lock, flags); | |
255 | r = idr_alloc(&drm_minors_idr, | |
256 | NULL, | |
257 | 64 * type, | |
258 | 64 * (type + 1), | |
259 | GFP_NOWAIT); | |
260 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
261 | idr_preload_end(); | |
262 | ||
263 | if (r < 0) | |
264 | goto err_free; | |
265 | ||
266 | minor->index = r; | |
267 | ||
e1728075 DH |
268 | minor->kdev = drm_sysfs_minor_alloc(minor); |
269 | if (IS_ERR(minor->kdev)) { | |
270 | r = PTR_ERR(minor->kdev); | |
271 | goto err_index; | |
272 | } | |
273 | ||
05b701f6 DH |
274 | *drm_minor_get_slot(dev, type) = minor; |
275 | return 0; | |
f1b85962 | 276 | |
e1728075 DH |
277 | err_index: |
278 | spin_lock_irqsave(&drm_minor_lock, flags); | |
279 | idr_remove(&drm_minors_idr, minor->index); | |
280 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
281 | err_free: |
282 | kfree(minor); | |
283 | return r; | |
05b701f6 DH |
284 | } |
285 | ||
bd9dfa98 DH |
286 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
287 | { | |
f1b85962 DH |
288 | struct drm_minor **slot, *minor; |
289 | unsigned long flags; | |
bd9dfa98 DH |
290 | |
291 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
292 | minor = *slot; |
293 | if (!minor) | |
294 | return; | |
295 | ||
e1728075 | 296 | put_device(minor->kdev); |
f1b85962 DH |
297 | |
298 | spin_lock_irqsave(&drm_minor_lock, flags); | |
299 | idr_remove(&drm_minors_idr, minor->index); | |
300 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
301 | ||
302 | kfree(minor); | |
303 | *slot = NULL; | |
bd9dfa98 DH |
304 | } |
305 | ||
afcdbc86 | 306 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 307 | { |
f1b85962 | 308 | struct drm_minor *minor; |
0d639883 | 309 | unsigned long flags; |
1da177e4 | 310 | int ret; |
1da177e4 LT |
311 | |
312 | DRM_DEBUG("\n"); | |
313 | ||
f1b85962 DH |
314 | minor = *drm_minor_get_slot(dev, type); |
315 | if (!minor) | |
05b701f6 DH |
316 | return 0; |
317 | ||
f1b85962 | 318 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 319 | if (ret) { |
156f5a78 | 320 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
f1b85962 | 321 | return ret; |
955b12de | 322 | } |
2c14f28b | 323 | |
e1728075 DH |
324 | ret = device_add(minor->kdev); |
325 | if (ret) | |
cb6458f9 | 326 | goto err_debugfs; |
2c14f28b | 327 | |
0d639883 DH |
328 | /* replace NULL with @minor so lookups will succeed from now on */ |
329 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 330 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 331 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 332 | |
f1b85962 | 333 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
334 | return 0; |
335 | ||
cb6458f9 | 336 | err_debugfs: |
f1b85962 | 337 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
338 | return ret; |
339 | } | |
b5e89ed5 | 340 | |
afcdbc86 | 341 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 342 | { |
afcdbc86 | 343 | struct drm_minor *minor; |
0d639883 | 344 | unsigned long flags; |
afcdbc86 DH |
345 | |
346 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 347 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
348 | return; |
349 | ||
f1b85962 | 350 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 351 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 352 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 353 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 354 | |
e1728075 DH |
355 | device_del(minor->kdev); |
356 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 357 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
358 | } |
359 | ||
360 | /** | |
1616c525 DH |
361 | * drm_minor_acquire - Acquire a DRM minor |
362 | * @minor_id: Minor ID of the DRM-minor | |
363 | * | |
364 | * Looks up the given minor-ID and returns the respective DRM-minor object. The | |
365 | * refence-count of the underlying device is increased so you must release this | |
366 | * object with drm_minor_release(). | |
367 | * | |
368 | * As long as you hold this minor, it is guaranteed that the object and the | |
369 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
370 | * unregistered while you hold the minor. | |
f73aca50 | 371 | * |
1616c525 DH |
372 | * Returns: |
373 | * Pointer to minor-object with increased device-refcount, or PTR_ERR on | |
374 | * failure. | |
1da177e4 | 375 | */ |
1616c525 | 376 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 377 | { |
1616c525 | 378 | struct drm_minor *minor; |
0d639883 | 379 | unsigned long flags; |
1616c525 | 380 | |
0d639883 | 381 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 382 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 DH |
383 | if (minor) |
384 | drm_dev_ref(minor->dev); | |
385 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
386 | ||
387 | if (!minor) { | |
388 | return ERR_PTR(-ENODEV); | |
389 | } else if (drm_device_is_unplugged(minor->dev)) { | |
390 | drm_dev_unref(minor->dev); | |
1616c525 | 391 | return ERR_PTR(-ENODEV); |
0d639883 | 392 | } |
673a394b | 393 | |
1616c525 DH |
394 | return minor; |
395 | } | |
b5e89ed5 | 396 | |
1616c525 DH |
397 | /** |
398 | * drm_minor_release - Release DRM minor | |
399 | * @minor: Pointer to DRM minor object | |
400 | * | |
401 | * Release a minor that was previously acquired via drm_minor_acquire(). | |
402 | */ | |
403 | void drm_minor_release(struct drm_minor *minor) | |
404 | { | |
405 | drm_dev_unref(minor->dev); | |
1da177e4 | 406 | } |
112b715e | 407 | |
6e3f797c DV |
408 | /** |
409 | * DOC: driver instance overview | |
410 | * | |
411 | * A device instance for a drm driver is represented by struct &drm_device. This | |
412 | * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() | |
413 | * callbacks implemented by the driver. The driver then needs to initialize all | |
414 | * the various subsystems for the drm device like memory management, vblank | |
415 | * handling, modesetting support and intial output configuration plus obviously | |
416 | * initialize all the corresponding hardware bits. An important part of this is | |
417 | * also calling drm_dev_set_unique() to set the userspace-visible unique name of | |
418 | * this device instance. Finally when everything is up and running and ready for | |
419 | * userspace the device instance can be published using drm_dev_register(). | |
420 | * | |
421 | * There is also deprecated support for initalizing device instances using | |
422 | * bus-specific helpers and the ->load() callback. But due to | |
423 | * backwards-compatibility needs the device instance have to be published too | |
424 | * early, which requires unpretty global locking to make safe and is therefore | |
425 | * only support for existing drivers not yet converted to the new scheme. | |
426 | * | |
427 | * When cleaning up a device instance everything needs to be done in reverse: | |
428 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
429 | * any other resources allocated at device initialization and drop the driver's | |
430 | * reference to &drm_device using drm_dev_unref(). | |
431 | * | |
432 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
433 | * historical baggage. Hence use the reference counting provided by | |
434 | * drm_dev_ref() and drm_dev_unref() only carefully. | |
435 | * | |
436 | * Also note that embedding of &drm_device is currently not (yet) supported (but | |
437 | * it would be easy to add). Drivers can store driver-private data in the | |
438 | * dev_priv field of &drm_device. | |
439 | */ | |
440 | ||
112b715e | 441 | /** |
c6a1af8a TR |
442 | * drm_put_dev - Unregister and release a DRM device |
443 | * @dev: DRM device | |
112b715e | 444 | * |
c6a1af8a | 445 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 446 | * |
c6a1af8a | 447 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
448 | * |
449 | * Note: Use of this function is deprecated. It will eventually go away | |
450 | * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly | |
451 | * instead to make sure that the device isn't userspace accessible any more | |
452 | * while teardown is in progress, ensuring that userspace can't access an | |
453 | * inconsistent state. | |
112b715e KH |
454 | */ |
455 | void drm_put_dev(struct drm_device *dev) | |
456 | { | |
112b715e KH |
457 | DRM_DEBUG("\n"); |
458 | ||
459 | if (!dev) { | |
460 | DRM_ERROR("cleanup called no dev\n"); | |
461 | return; | |
462 | } | |
463 | ||
c3a49737 | 464 | drm_dev_unregister(dev); |
099d1c29 | 465 | drm_dev_unref(dev); |
112b715e KH |
466 | } |
467 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
468 | |
469 | void drm_unplug_dev(struct drm_device *dev) | |
470 | { | |
471 | /* for a USB device */ | |
afcdbc86 DH |
472 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
473 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
474 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
2c07a21d DA |
475 | |
476 | mutex_lock(&drm_global_mutex); | |
477 | ||
478 | drm_device_set_unplugged(dev); | |
479 | ||
480 | if (dev->open_count == 0) { | |
481 | drm_put_dev(dev); | |
482 | } | |
483 | mutex_unlock(&drm_global_mutex); | |
484 | } | |
485 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 486 | |
31bbe16f DH |
487 | /* |
488 | * DRM internal mount | |
489 | * We want to be able to allocate our own "struct address_space" to control | |
490 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
491 | * stand-alone address_space objects, so we need an underlying inode. As there | |
492 | * is no way to allocate an independent inode easily, we need a fake internal | |
493 | * VFS mount-point. | |
494 | * | |
495 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
496 | * frees it again. You are allowed to use iget() and iput() to get references to | |
497 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
498 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
499 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
500 | * between multiple inode-users. You could, technically, call | |
501 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
502 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
503 | */ | |
504 | ||
505 | static int drm_fs_cnt; | |
506 | static struct vfsmount *drm_fs_mnt; | |
507 | ||
508 | static const struct dentry_operations drm_fs_dops = { | |
509 | .d_dname = simple_dname, | |
510 | }; | |
511 | ||
512 | static const struct super_operations drm_fs_sops = { | |
513 | .statfs = simple_statfs, | |
514 | }; | |
515 | ||
516 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
517 | const char *dev_name, void *data) | |
518 | { | |
519 | return mount_pseudo(fs_type, | |
520 | "drm:", | |
521 | &drm_fs_sops, | |
522 | &drm_fs_dops, | |
523 | 0x010203ff); | |
524 | } | |
525 | ||
526 | static struct file_system_type drm_fs_type = { | |
527 | .name = "drm", | |
528 | .owner = THIS_MODULE, | |
529 | .mount = drm_fs_mount, | |
530 | .kill_sb = kill_anon_super, | |
531 | }; | |
532 | ||
533 | static struct inode *drm_fs_inode_new(void) | |
534 | { | |
535 | struct inode *inode; | |
536 | int r; | |
537 | ||
538 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
539 | if (r < 0) { | |
540 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
541 | return ERR_PTR(r); | |
542 | } | |
543 | ||
544 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
545 | if (IS_ERR(inode)) | |
546 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
547 | ||
548 | return inode; | |
549 | } | |
550 | ||
551 | static void drm_fs_inode_free(struct inode *inode) | |
552 | { | |
553 | if (inode) { | |
554 | iput(inode); | |
555 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
556 | } | |
557 | } | |
558 | ||
1bb72532 | 559 | /** |
c6a1af8a | 560 | * drm_dev_alloc - Allocate new DRM device |
1bb72532 DH |
561 | * @driver: DRM driver to allocate device for |
562 | * @parent: Parent device object | |
563 | * | |
564 | * Allocate and initialize a new DRM device. No device registration is done. | |
c22f0ace | 565 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
566 | * with other core subsystems. This should be done last in the device |
567 | * initialization sequence to make sure userspace can't access an inconsistent | |
568 | * state. | |
1bb72532 | 569 | * |
099d1c29 DH |
570 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
571 | * drm_dev_unref() to take and drop further ref-counts. | |
572 | * | |
b0ff4b93 DV |
573 | * Note that for purely virtual devices @parent can be NULL. |
574 | * | |
1bb72532 DH |
575 | * RETURNS: |
576 | * Pointer to new DRM device, or NULL if out of memory. | |
577 | */ | |
578 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
579 | struct device *parent) | |
580 | { | |
581 | struct drm_device *dev; | |
582 | int ret; | |
583 | ||
584 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
585 | if (!dev) | |
586 | return NULL; | |
587 | ||
099d1c29 | 588 | kref_init(&dev->ref); |
1bb72532 DH |
589 | dev->dev = parent; |
590 | dev->driver = driver; | |
591 | ||
592 | INIT_LIST_HEAD(&dev->filelist); | |
593 | INIT_LIST_HEAD(&dev->ctxlist); | |
594 | INIT_LIST_HEAD(&dev->vmalist); | |
595 | INIT_LIST_HEAD(&dev->maplist); | |
596 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
597 | ||
2177a218 | 598 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
599 | spin_lock_init(&dev->event_lock); |
600 | mutex_init(&dev->struct_mutex); | |
601 | mutex_init(&dev->ctxlist_mutex); | |
c996fd0b | 602 | mutex_init(&dev->master_mutex); |
1bb72532 | 603 | |
6796cb16 DH |
604 | dev->anon_inode = drm_fs_inode_new(); |
605 | if (IS_ERR(dev->anon_inode)) { | |
606 | ret = PTR_ERR(dev->anon_inode); | |
607 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 608 | goto err_free; |
6796cb16 DH |
609 | } |
610 | ||
05b701f6 DH |
611 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
612 | ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); | |
613 | if (ret) | |
614 | goto err_minors; | |
bcfe0c09 GP |
615 | |
616 | WARN_ON(driver->suspend || driver->resume); | |
05b701f6 DH |
617 | } |
618 | ||
6d6dfcfb | 619 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
620 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
621 | if (ret) | |
622 | goto err_minors; | |
623 | } | |
624 | ||
625 | ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY); | |
626 | if (ret) | |
627 | goto err_minors; | |
628 | ||
6796cb16 | 629 | if (drm_ht_create(&dev->map_hash, 12)) |
05b701f6 | 630 | goto err_minors; |
1bb72532 | 631 | |
ba6976c1 | 632 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 633 | |
1bcecfac | 634 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
635 | ret = drm_gem_init(dev); |
636 | if (ret) { | |
637 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
638 | goto err_ctxbitmap; | |
639 | } | |
640 | } | |
641 | ||
e112e593 NI |
642 | if (parent) { |
643 | ret = drm_dev_set_unique(dev, dev_name(parent)); | |
644 | if (ret) | |
645 | goto err_setunique; | |
646 | } | |
647 | ||
1bb72532 DH |
648 | return dev; |
649 | ||
e112e593 NI |
650 | err_setunique: |
651 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
652 | drm_gem_destroy(dev); | |
1bb72532 | 653 | err_ctxbitmap: |
e7b96070 | 654 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 655 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 656 | err_minors: |
bd9dfa98 DH |
657 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
658 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
659 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 660 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 661 | err_free: |
c996fd0b | 662 | mutex_destroy(&dev->master_mutex); |
1bb72532 DH |
663 | kfree(dev); |
664 | return NULL; | |
665 | } | |
666 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 667 | |
099d1c29 | 668 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 669 | { |
099d1c29 | 670 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 671 | |
1bcecfac | 672 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
0dc8fe59 DH |
673 | drm_gem_destroy(dev); |
674 | ||
e7b96070 | 675 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 676 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 677 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 678 | |
bd9dfa98 DH |
679 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
680 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
681 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
682 | ||
c996fd0b | 683 | mutex_destroy(&dev->master_mutex); |
ca8e2ad7 | 684 | kfree(dev->unique); |
0dc8fe59 DH |
685 | kfree(dev); |
686 | } | |
099d1c29 DH |
687 | |
688 | /** | |
689 | * drm_dev_ref - Take reference of a DRM device | |
690 | * @dev: device to take reference of or NULL | |
691 | * | |
692 | * This increases the ref-count of @dev by one. You *must* already own a | |
693 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
694 | * again. | |
695 | * | |
696 | * This function never fails. However, this function does not provide *any* | |
697 | * guarantee whether the device is alive or running. It only provides a | |
698 | * reference to the object and the memory associated with it. | |
699 | */ | |
700 | void drm_dev_ref(struct drm_device *dev) | |
701 | { | |
702 | if (dev) | |
703 | kref_get(&dev->ref); | |
704 | } | |
705 | EXPORT_SYMBOL(drm_dev_ref); | |
706 | ||
707 | /** | |
708 | * drm_dev_unref - Drop reference of a DRM device | |
709 | * @dev: device to drop reference of or NULL | |
710 | * | |
711 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
712 | * ref-count drops to zero. | |
713 | */ | |
714 | void drm_dev_unref(struct drm_device *dev) | |
715 | { | |
716 | if (dev) | |
717 | kref_put(&dev->ref, drm_dev_release); | |
718 | } | |
719 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 720 | |
c22f0ace DH |
721 | /** |
722 | * drm_dev_register - Register DRM device | |
723 | * @dev: Device to register | |
c6a1af8a | 724 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
725 | * |
726 | * Register the DRM device @dev with the system, advertise device to user-space | |
727 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
54d2c2da AB |
728 | * previously. Right after drm_dev_register() the driver should call |
729 | * drm_connector_register_all() to register all connectors in sysfs. This is | |
730 | * a separate call for backward compatibility with drivers still using | |
731 | * the deprecated ->load() callback, where connectors are registered from within | |
732 | * the ->load() callback. | |
c22f0ace DH |
733 | * |
734 | * Never call this twice on any device! | |
735 | * | |
6e3f797c DV |
736 | * NOTE: To ensure backward compatibility with existing drivers method this |
737 | * function calls the ->load() method after registering the device nodes, | |
738 | * creating race conditions. Usage of the ->load() methods is therefore | |
739 | * deprecated, drivers must perform all initialization before calling | |
740 | * drm_dev_register(). | |
741 | * | |
c22f0ace DH |
742 | * RETURNS: |
743 | * 0 on success, negative error code on failure. | |
744 | */ | |
745 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
746 | { | |
747 | int ret; | |
748 | ||
749 | mutex_lock(&drm_global_mutex); | |
750 | ||
afcdbc86 | 751 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
752 | if (ret) |
753 | goto err_minors; | |
c22f0ace | 754 | |
afcdbc86 | 755 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
756 | if (ret) |
757 | goto err_minors; | |
c22f0ace | 758 | |
afcdbc86 | 759 | ret = drm_minor_register(dev, DRM_MINOR_LEGACY); |
c22f0ace | 760 | if (ret) |
05b701f6 | 761 | goto err_minors; |
c22f0ace DH |
762 | |
763 | if (dev->driver->load) { | |
764 | ret = dev->driver->load(dev, flags); | |
765 | if (ret) | |
05b701f6 | 766 | goto err_minors; |
c22f0ace DH |
767 | } |
768 | ||
c22f0ace DH |
769 | ret = 0; |
770 | goto out_unlock; | |
771 | ||
05b701f6 | 772 | err_minors: |
afcdbc86 DH |
773 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
774 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
775 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
776 | out_unlock: |
777 | mutex_unlock(&drm_global_mutex); | |
778 | return ret; | |
779 | } | |
780 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
781 | |
782 | /** | |
783 | * drm_dev_unregister - Unregister DRM device | |
784 | * @dev: Device to unregister | |
785 | * | |
786 | * Unregister the DRM device from the system. This does the reverse of | |
787 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 788 | * drm_dev_unref() to drop their final reference. |
6e3f797c DV |
789 | * |
790 | * This should be called first in the device teardown code to make sure | |
791 | * userspace can't access the device instance any more. | |
c3a49737 DH |
792 | */ |
793 | void drm_dev_unregister(struct drm_device *dev) | |
794 | { | |
795 | struct drm_map_list *r_list, *list_temp; | |
796 | ||
797 | drm_lastclose(dev); | |
798 | ||
799 | if (dev->driver->unload) | |
800 | dev->driver->unload(dev); | |
801 | ||
4efafebe DV |
802 | if (dev->agp) |
803 | drm_pci_agp_destroy(dev); | |
c3a49737 DH |
804 | |
805 | drm_vblank_cleanup(dev); | |
806 | ||
807 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) | |
9fc5cde7 | 808 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 809 | |
afcdbc86 DH |
810 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
811 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
812 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
813 | } |
814 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 TR |
815 | |
816 | /** | |
817 | * drm_dev_set_unique - Set the unique name of a DRM device | |
818 | * @dev: device of which to set the unique name | |
399368aa | 819 | * @name: unique name |
ca8e2ad7 | 820 | * |
399368aa NI |
821 | * Sets the unique name of a DRM device using the specified string. Drivers |
822 | * can use this at driver probe time if the unique name of the devices they | |
823 | * drive is static. | |
ca8e2ad7 TR |
824 | * |
825 | * Return: 0 on success or a negative error code on failure. | |
826 | */ | |
399368aa | 827 | int drm_dev_set_unique(struct drm_device *dev, const char *name) |
ca8e2ad7 | 828 | { |
ca8e2ad7 | 829 | kfree(dev->unique); |
399368aa | 830 | dev->unique = kstrdup(name, GFP_KERNEL); |
ca8e2ad7 TR |
831 | |
832 | return dev->unique ? 0 : -ENOMEM; | |
833 | } | |
834 | EXPORT_SYMBOL(drm_dev_set_unique); | |
1b7199fe DH |
835 | |
836 | /* | |
837 | * DRM Core | |
838 | * The DRM core module initializes all global DRM objects and makes them | |
839 | * available to drivers. Once setup, drivers can probe their respective | |
840 | * devices. | |
841 | * Currently, core management includes: | |
842 | * - The "DRM-Global" key/value database | |
843 | * - Global ID management for connectors | |
844 | * - DRM major number allocation | |
845 | * - DRM minor management | |
846 | * - DRM sysfs class | |
847 | * - DRM debugfs root | |
848 | * | |
849 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
850 | * interface registered on a DRM device, you can request minor numbers from DRM | |
851 | * core. DRM core takes care of major-number management and char-dev | |
852 | * registration. A stub ->open() callback forwards any open() requests to the | |
853 | * registered minor. | |
854 | */ | |
855 | ||
856 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
857 | { | |
858 | const struct file_operations *new_fops; | |
859 | struct drm_minor *minor; | |
860 | int err; | |
861 | ||
862 | DRM_DEBUG("\n"); | |
863 | ||
864 | mutex_lock(&drm_global_mutex); | |
865 | minor = drm_minor_acquire(iminor(inode)); | |
866 | if (IS_ERR(minor)) { | |
867 | err = PTR_ERR(minor); | |
868 | goto out_unlock; | |
869 | } | |
870 | ||
871 | new_fops = fops_get(minor->dev->driver->fops); | |
872 | if (!new_fops) { | |
873 | err = -ENODEV; | |
874 | goto out_release; | |
875 | } | |
876 | ||
877 | replace_fops(filp, new_fops); | |
878 | if (filp->f_op->open) | |
879 | err = filp->f_op->open(inode, filp); | |
880 | else | |
881 | err = 0; | |
882 | ||
883 | out_release: | |
884 | drm_minor_release(minor); | |
885 | out_unlock: | |
886 | mutex_unlock(&drm_global_mutex); | |
887 | return err; | |
888 | } | |
889 | ||
890 | static const struct file_operations drm_stub_fops = { | |
891 | .owner = THIS_MODULE, | |
892 | .open = drm_stub_open, | |
893 | .llseek = noop_llseek, | |
894 | }; | |
895 | ||
896 | static int __init drm_core_init(void) | |
897 | { | |
898 | int ret = -ENOMEM; | |
899 | ||
900 | drm_global_init(); | |
901 | drm_connector_ida_init(); | |
902 | idr_init(&drm_minors_idr); | |
903 | ||
904 | if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) | |
905 | goto err_p1; | |
906 | ||
fcc90213 DH |
907 | ret = drm_sysfs_init(); |
908 | if (ret < 0) { | |
1b7199fe | 909 | printk(KERN_ERR "DRM: Error creating drm class.\n"); |
1b7199fe DH |
910 | goto err_p2; |
911 | } | |
912 | ||
913 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
914 | if (!drm_debugfs_root) { | |
915 | DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); | |
916 | ret = -1; | |
917 | goto err_p3; | |
918 | } | |
919 | ||
920 | DRM_INFO("Initialized %s %d.%d.%d %s\n", | |
921 | CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); | |
922 | return 0; | |
923 | err_p3: | |
924 | drm_sysfs_destroy(); | |
925 | err_p2: | |
926 | unregister_chrdev(DRM_MAJOR, "drm"); | |
927 | ||
928 | idr_destroy(&drm_minors_idr); | |
929 | err_p1: | |
930 | return ret; | |
931 | } | |
932 | ||
933 | static void __exit drm_core_exit(void) | |
934 | { | |
935 | debugfs_remove(drm_debugfs_root); | |
936 | drm_sysfs_destroy(); | |
937 | ||
938 | unregister_chrdev(DRM_MAJOR, "drm"); | |
939 | ||
940 | drm_connector_ida_destroy(); | |
941 | idr_destroy(&drm_minors_idr); | |
942 | } | |
943 | ||
944 | module_init(drm_core_init); | |
945 | module_exit(drm_core_exit); |