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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 | |
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 DA |
123 | struct drm_device *dev = master->minor->dev; |
124 | ||
7c1c2871 DA |
125 | if (dev->driver->master_destroy) |
126 | dev->driver->master_destroy(dev, master); | |
127 | ||
40647e45 | 128 | drm_legacy_master_rmmaps(dev, master); |
32e7b94a DH |
129 | |
130 | idr_destroy(&master->magic_map); | |
4a324d33 | 131 | kfree(master->unique); |
9a298b2a | 132 | kfree(master); |
7c1c2871 DA |
133 | } |
134 | ||
135 | void drm_master_put(struct drm_master **master) | |
136 | { | |
137 | kref_put(&(*master)->refcount, drm_master_destroy); | |
138 | *master = NULL; | |
139 | } | |
85bb0c37 | 140 | EXPORT_SYMBOL(drm_master_put); |
7c1c2871 DA |
141 | |
142 | int drm_setmaster_ioctl(struct drm_device *dev, void *data, | |
143 | struct drm_file *file_priv) | |
144 | { | |
53ef1600 | 145 | int ret = 0; |
862302ff | 146 | |
c996fd0b | 147 | mutex_lock(&dev->master_mutex); |
7963e9db | 148 | if (file_priv->is_master) |
c996fd0b | 149 | goto out_unlock; |
7c1c2871 | 150 | |
c996fd0b TH |
151 | if (file_priv->minor->master) { |
152 | ret = -EINVAL; | |
153 | goto out_unlock; | |
154 | } | |
7c1c2871 | 155 | |
c996fd0b TH |
156 | if (!file_priv->master) { |
157 | ret = -EINVAL; | |
158 | goto out_unlock; | |
159 | } | |
08bec5b4 | 160 | |
a0af2e53 TH |
161 | if (!file_priv->allowed_master) { |
162 | ret = drm_new_set_master(dev, file_priv); | |
163 | goto out_unlock; | |
164 | } | |
165 | ||
08bec5b4 | 166 | file_priv->minor->master = drm_master_get(file_priv->master); |
7963e9db | 167 | file_priv->is_master = 1; |
08bec5b4 DH |
168 | if (dev->driver->master_set) { |
169 | ret = dev->driver->master_set(dev, file_priv, false); | |
7963e9db DA |
170 | if (unlikely(ret != 0)) { |
171 | file_priv->is_master = 0; | |
08bec5b4 | 172 | drm_master_put(&file_priv->minor->master); |
7963e9db | 173 | } |
7c1c2871 DA |
174 | } |
175 | ||
c996fd0b TH |
176 | out_unlock: |
177 | mutex_unlock(&dev->master_mutex); | |
53ef1600 | 178 | return ret; |
7c1c2871 DA |
179 | } |
180 | ||
181 | int drm_dropmaster_ioctl(struct drm_device *dev, void *data, | |
182 | struct drm_file *file_priv) | |
183 | { | |
c996fd0b TH |
184 | int ret = -EINVAL; |
185 | ||
186 | mutex_lock(&dev->master_mutex); | |
7963e9db | 187 | if (!file_priv->is_master) |
c996fd0b | 188 | goto out_unlock; |
6b008426 | 189 | |
07f1c7a7 | 190 | if (!file_priv->minor->master) |
c996fd0b | 191 | goto out_unlock; |
07f1c7a7 | 192 | |
c996fd0b | 193 | ret = 0; |
862302ff TH |
194 | if (dev->driver->master_drop) |
195 | dev->driver->master_drop(dev, file_priv, false); | |
7c1c2871 | 196 | drm_master_put(&file_priv->minor->master); |
7963e9db | 197 | file_priv->is_master = 0; |
c996fd0b TH |
198 | |
199 | out_unlock: | |
200 | mutex_unlock(&dev->master_mutex); | |
201 | return ret; | |
7c1c2871 DA |
202 | } |
203 | ||
0d639883 DH |
204 | /* |
205 | * DRM Minors | |
206 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
207 | * of them is represented by a drm_minor object. Depending on the capabilities | |
208 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 209 | * |
0d639883 DH |
210 | * Minors can be accessed via dev->$minor_name. This pointer is either |
211 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
212 | * valid. This means, DRM minors have the same life-time as the underlying | |
213 | * device. However, this doesn't mean that the minor is active. Minors are | |
214 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 215 | */ |
0d639883 | 216 | |
05b701f6 DH |
217 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
218 | unsigned int type) | |
219 | { | |
220 | switch (type) { | |
221 | case DRM_MINOR_LEGACY: | |
222 | return &dev->primary; | |
223 | case DRM_MINOR_RENDER: | |
224 | return &dev->render; | |
225 | case DRM_MINOR_CONTROL: | |
226 | return &dev->control; | |
227 | default: | |
228 | return NULL; | |
229 | } | |
230 | } | |
231 | ||
232 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
233 | { | |
234 | struct drm_minor *minor; | |
f1b85962 DH |
235 | unsigned long flags; |
236 | int r; | |
05b701f6 DH |
237 | |
238 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
239 | if (!minor) | |
240 | return -ENOMEM; | |
241 | ||
242 | minor->type = type; | |
243 | minor->dev = dev; | |
05b701f6 | 244 | |
f1b85962 DH |
245 | idr_preload(GFP_KERNEL); |
246 | spin_lock_irqsave(&drm_minor_lock, flags); | |
247 | r = idr_alloc(&drm_minors_idr, | |
248 | NULL, | |
249 | 64 * type, | |
250 | 64 * (type + 1), | |
251 | GFP_NOWAIT); | |
252 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
253 | idr_preload_end(); | |
254 | ||
255 | if (r < 0) | |
256 | goto err_free; | |
257 | ||
258 | minor->index = r; | |
259 | ||
e1728075 DH |
260 | minor->kdev = drm_sysfs_minor_alloc(minor); |
261 | if (IS_ERR(minor->kdev)) { | |
262 | r = PTR_ERR(minor->kdev); | |
263 | goto err_index; | |
264 | } | |
265 | ||
05b701f6 DH |
266 | *drm_minor_get_slot(dev, type) = minor; |
267 | return 0; | |
f1b85962 | 268 | |
e1728075 DH |
269 | err_index: |
270 | spin_lock_irqsave(&drm_minor_lock, flags); | |
271 | idr_remove(&drm_minors_idr, minor->index); | |
272 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
273 | err_free: |
274 | kfree(minor); | |
275 | return r; | |
05b701f6 DH |
276 | } |
277 | ||
bd9dfa98 DH |
278 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
279 | { | |
f1b85962 DH |
280 | struct drm_minor **slot, *minor; |
281 | unsigned long flags; | |
bd9dfa98 DH |
282 | |
283 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
284 | minor = *slot; |
285 | if (!minor) | |
286 | return; | |
287 | ||
e1728075 | 288 | put_device(minor->kdev); |
f1b85962 DH |
289 | |
290 | spin_lock_irqsave(&drm_minor_lock, flags); | |
291 | idr_remove(&drm_minors_idr, minor->index); | |
292 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
293 | ||
294 | kfree(minor); | |
295 | *slot = NULL; | |
bd9dfa98 DH |
296 | } |
297 | ||
afcdbc86 | 298 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 299 | { |
f1b85962 | 300 | struct drm_minor *minor; |
0d639883 | 301 | unsigned long flags; |
1da177e4 | 302 | int ret; |
1da177e4 LT |
303 | |
304 | DRM_DEBUG("\n"); | |
305 | ||
f1b85962 DH |
306 | minor = *drm_minor_get_slot(dev, type); |
307 | if (!minor) | |
05b701f6 DH |
308 | return 0; |
309 | ||
f1b85962 | 310 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 311 | if (ret) { |
156f5a78 | 312 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
f1b85962 | 313 | return ret; |
955b12de | 314 | } |
2c14f28b | 315 | |
e1728075 DH |
316 | ret = device_add(minor->kdev); |
317 | if (ret) | |
cb6458f9 | 318 | goto err_debugfs; |
2c14f28b | 319 | |
0d639883 DH |
320 | /* replace NULL with @minor so lookups will succeed from now on */ |
321 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 322 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 323 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 324 | |
f1b85962 | 325 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
326 | return 0; |
327 | ||
cb6458f9 | 328 | err_debugfs: |
f1b85962 | 329 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
330 | return ret; |
331 | } | |
b5e89ed5 | 332 | |
afcdbc86 | 333 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 334 | { |
afcdbc86 | 335 | struct drm_minor *minor; |
0d639883 | 336 | unsigned long flags; |
afcdbc86 DH |
337 | |
338 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 339 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
340 | return; |
341 | ||
f1b85962 | 342 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 343 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 344 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 345 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 346 | |
e1728075 DH |
347 | device_del(minor->kdev); |
348 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 349 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
350 | } |
351 | ||
352 | /** | |
1616c525 DH |
353 | * drm_minor_acquire - Acquire a DRM minor |
354 | * @minor_id: Minor ID of the DRM-minor | |
355 | * | |
356 | * Looks up the given minor-ID and returns the respective DRM-minor object. The | |
357 | * refence-count of the underlying device is increased so you must release this | |
358 | * object with drm_minor_release(). | |
359 | * | |
360 | * As long as you hold this minor, it is guaranteed that the object and the | |
361 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
362 | * unregistered while you hold the minor. | |
f73aca50 | 363 | * |
1616c525 DH |
364 | * Returns: |
365 | * Pointer to minor-object with increased device-refcount, or PTR_ERR on | |
366 | * failure. | |
1da177e4 | 367 | */ |
1616c525 | 368 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 369 | { |
1616c525 | 370 | struct drm_minor *minor; |
0d639883 | 371 | unsigned long flags; |
1616c525 | 372 | |
0d639883 | 373 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 374 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 DH |
375 | if (minor) |
376 | drm_dev_ref(minor->dev); | |
377 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
378 | ||
379 | if (!minor) { | |
380 | return ERR_PTR(-ENODEV); | |
381 | } else if (drm_device_is_unplugged(minor->dev)) { | |
382 | drm_dev_unref(minor->dev); | |
1616c525 | 383 | return ERR_PTR(-ENODEV); |
0d639883 | 384 | } |
673a394b | 385 | |
1616c525 DH |
386 | return minor; |
387 | } | |
b5e89ed5 | 388 | |
1616c525 DH |
389 | /** |
390 | * drm_minor_release - Release DRM minor | |
391 | * @minor: Pointer to DRM minor object | |
392 | * | |
393 | * Release a minor that was previously acquired via drm_minor_acquire(). | |
394 | */ | |
395 | void drm_minor_release(struct drm_minor *minor) | |
396 | { | |
397 | drm_dev_unref(minor->dev); | |
1da177e4 | 398 | } |
112b715e | 399 | |
6e3f797c DV |
400 | /** |
401 | * DOC: driver instance overview | |
402 | * | |
403 | * A device instance for a drm driver is represented by struct &drm_device. This | |
404 | * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() | |
405 | * callbacks implemented by the driver. The driver then needs to initialize all | |
406 | * the various subsystems for the drm device like memory management, vblank | |
407 | * handling, modesetting support and intial output configuration plus obviously | |
408 | * initialize all the corresponding hardware bits. An important part of this is | |
409 | * also calling drm_dev_set_unique() to set the userspace-visible unique name of | |
410 | * this device instance. Finally when everything is up and running and ready for | |
411 | * userspace the device instance can be published using drm_dev_register(). | |
412 | * | |
413 | * There is also deprecated support for initalizing device instances using | |
414 | * bus-specific helpers and the ->load() callback. But due to | |
415 | * backwards-compatibility needs the device instance have to be published too | |
416 | * early, which requires unpretty global locking to make safe and is therefore | |
417 | * only support for existing drivers not yet converted to the new scheme. | |
418 | * | |
419 | * When cleaning up a device instance everything needs to be done in reverse: | |
420 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
421 | * any other resources allocated at device initialization and drop the driver's | |
422 | * reference to &drm_device using drm_dev_unref(). | |
423 | * | |
424 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
425 | * historical baggage. Hence use the reference counting provided by | |
426 | * drm_dev_ref() and drm_dev_unref() only carefully. | |
427 | * | |
428 | * Also note that embedding of &drm_device is currently not (yet) supported (but | |
429 | * it would be easy to add). Drivers can store driver-private data in the | |
430 | * dev_priv field of &drm_device. | |
431 | */ | |
432 | ||
112b715e | 433 | /** |
c6a1af8a TR |
434 | * drm_put_dev - Unregister and release a DRM device |
435 | * @dev: DRM device | |
112b715e | 436 | * |
c6a1af8a | 437 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 438 | * |
c6a1af8a | 439 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
440 | * |
441 | * Note: Use of this function is deprecated. It will eventually go away | |
442 | * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly | |
443 | * instead to make sure that the device isn't userspace accessible any more | |
444 | * while teardown is in progress, ensuring that userspace can't access an | |
445 | * inconsistent state. | |
112b715e KH |
446 | */ |
447 | void drm_put_dev(struct drm_device *dev) | |
448 | { | |
112b715e KH |
449 | DRM_DEBUG("\n"); |
450 | ||
451 | if (!dev) { | |
452 | DRM_ERROR("cleanup called no dev\n"); | |
453 | return; | |
454 | } | |
455 | ||
c3a49737 | 456 | drm_dev_unregister(dev); |
099d1c29 | 457 | drm_dev_unref(dev); |
112b715e KH |
458 | } |
459 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
460 | |
461 | void drm_unplug_dev(struct drm_device *dev) | |
462 | { | |
463 | /* for a USB device */ | |
afcdbc86 DH |
464 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
465 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
466 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
2c07a21d DA |
467 | |
468 | mutex_lock(&drm_global_mutex); | |
469 | ||
470 | drm_device_set_unplugged(dev); | |
471 | ||
472 | if (dev->open_count == 0) { | |
473 | drm_put_dev(dev); | |
474 | } | |
475 | mutex_unlock(&drm_global_mutex); | |
476 | } | |
477 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 478 | |
31bbe16f DH |
479 | /* |
480 | * DRM internal mount | |
481 | * We want to be able to allocate our own "struct address_space" to control | |
482 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
483 | * stand-alone address_space objects, so we need an underlying inode. As there | |
484 | * is no way to allocate an independent inode easily, we need a fake internal | |
485 | * VFS mount-point. | |
486 | * | |
487 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
488 | * frees it again. You are allowed to use iget() and iput() to get references to | |
489 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
490 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
491 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
492 | * between multiple inode-users. You could, technically, call | |
493 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
494 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
495 | */ | |
496 | ||
497 | static int drm_fs_cnt; | |
498 | static struct vfsmount *drm_fs_mnt; | |
499 | ||
500 | static const struct dentry_operations drm_fs_dops = { | |
501 | .d_dname = simple_dname, | |
502 | }; | |
503 | ||
504 | static const struct super_operations drm_fs_sops = { | |
505 | .statfs = simple_statfs, | |
506 | }; | |
507 | ||
508 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
509 | const char *dev_name, void *data) | |
510 | { | |
511 | return mount_pseudo(fs_type, | |
512 | "drm:", | |
513 | &drm_fs_sops, | |
514 | &drm_fs_dops, | |
515 | 0x010203ff); | |
516 | } | |
517 | ||
518 | static struct file_system_type drm_fs_type = { | |
519 | .name = "drm", | |
520 | .owner = THIS_MODULE, | |
521 | .mount = drm_fs_mount, | |
522 | .kill_sb = kill_anon_super, | |
523 | }; | |
524 | ||
525 | static struct inode *drm_fs_inode_new(void) | |
526 | { | |
527 | struct inode *inode; | |
528 | int r; | |
529 | ||
530 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
531 | if (r < 0) { | |
532 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
533 | return ERR_PTR(r); | |
534 | } | |
535 | ||
536 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
537 | if (IS_ERR(inode)) | |
538 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
539 | ||
540 | return inode; | |
541 | } | |
542 | ||
543 | static void drm_fs_inode_free(struct inode *inode) | |
544 | { | |
545 | if (inode) { | |
546 | iput(inode); | |
547 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
548 | } | |
549 | } | |
550 | ||
1bb72532 | 551 | /** |
c6a1af8a | 552 | * drm_dev_alloc - Allocate new DRM device |
1bb72532 DH |
553 | * @driver: DRM driver to allocate device for |
554 | * @parent: Parent device object | |
555 | * | |
556 | * Allocate and initialize a new DRM device. No device registration is done. | |
c22f0ace | 557 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
558 | * with other core subsystems. This should be done last in the device |
559 | * initialization sequence to make sure userspace can't access an inconsistent | |
560 | * state. | |
1bb72532 | 561 | * |
099d1c29 DH |
562 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
563 | * drm_dev_unref() to take and drop further ref-counts. | |
564 | * | |
b0ff4b93 DV |
565 | * Note that for purely virtual devices @parent can be NULL. |
566 | * | |
1bb72532 DH |
567 | * RETURNS: |
568 | * Pointer to new DRM device, or NULL if out of memory. | |
569 | */ | |
570 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
571 | struct device *parent) | |
572 | { | |
573 | struct drm_device *dev; | |
574 | int ret; | |
575 | ||
576 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
577 | if (!dev) | |
578 | return NULL; | |
579 | ||
099d1c29 | 580 | kref_init(&dev->ref); |
1bb72532 DH |
581 | dev->dev = parent; |
582 | dev->driver = driver; | |
583 | ||
584 | INIT_LIST_HEAD(&dev->filelist); | |
585 | INIT_LIST_HEAD(&dev->ctxlist); | |
586 | INIT_LIST_HEAD(&dev->vmalist); | |
587 | INIT_LIST_HEAD(&dev->maplist); | |
588 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
589 | ||
2177a218 | 590 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
591 | spin_lock_init(&dev->event_lock); |
592 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 593 | mutex_init(&dev->filelist_mutex); |
1bb72532 | 594 | mutex_init(&dev->ctxlist_mutex); |
c996fd0b | 595 | mutex_init(&dev->master_mutex); |
1bb72532 | 596 | |
6796cb16 DH |
597 | dev->anon_inode = drm_fs_inode_new(); |
598 | if (IS_ERR(dev->anon_inode)) { | |
599 | ret = PTR_ERR(dev->anon_inode); | |
600 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 601 | goto err_free; |
6796cb16 DH |
602 | } |
603 | ||
05b701f6 DH |
604 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
605 | ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); | |
606 | if (ret) | |
607 | goto err_minors; | |
bcfe0c09 GP |
608 | |
609 | WARN_ON(driver->suspend || driver->resume); | |
05b701f6 DH |
610 | } |
611 | ||
6d6dfcfb | 612 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
613 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
614 | if (ret) | |
615 | goto err_minors; | |
616 | } | |
617 | ||
618 | ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY); | |
619 | if (ret) | |
620 | goto err_minors; | |
621 | ||
6796cb16 | 622 | if (drm_ht_create(&dev->map_hash, 12)) |
05b701f6 | 623 | goto err_minors; |
1bb72532 | 624 | |
ba6976c1 | 625 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 626 | |
1bcecfac | 627 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
628 | ret = drm_gem_init(dev); |
629 | if (ret) { | |
630 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
631 | goto err_ctxbitmap; | |
632 | } | |
633 | } | |
634 | ||
e112e593 NI |
635 | if (parent) { |
636 | ret = drm_dev_set_unique(dev, dev_name(parent)); | |
637 | if (ret) | |
638 | goto err_setunique; | |
639 | } | |
640 | ||
1bb72532 DH |
641 | return dev; |
642 | ||
e112e593 NI |
643 | err_setunique: |
644 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
645 | drm_gem_destroy(dev); | |
1bb72532 | 646 | err_ctxbitmap: |
e7b96070 | 647 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 648 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 649 | err_minors: |
bd9dfa98 DH |
650 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
651 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
652 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 653 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 654 | err_free: |
c996fd0b | 655 | mutex_destroy(&dev->master_mutex); |
1bb72532 DH |
656 | kfree(dev); |
657 | return NULL; | |
658 | } | |
659 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 660 | |
099d1c29 | 661 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 662 | { |
099d1c29 | 663 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 664 | |
1bcecfac | 665 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
0dc8fe59 DH |
666 | drm_gem_destroy(dev); |
667 | ||
e7b96070 | 668 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 669 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 670 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 671 | |
bd9dfa98 DH |
672 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
673 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
674 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
675 | ||
c996fd0b | 676 | mutex_destroy(&dev->master_mutex); |
ca8e2ad7 | 677 | kfree(dev->unique); |
0dc8fe59 DH |
678 | kfree(dev); |
679 | } | |
099d1c29 DH |
680 | |
681 | /** | |
682 | * drm_dev_ref - Take reference of a DRM device | |
683 | * @dev: device to take reference of or NULL | |
684 | * | |
685 | * This increases the ref-count of @dev by one. You *must* already own a | |
686 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
687 | * again. | |
688 | * | |
689 | * This function never fails. However, this function does not provide *any* | |
690 | * guarantee whether the device is alive or running. It only provides a | |
691 | * reference to the object and the memory associated with it. | |
692 | */ | |
693 | void drm_dev_ref(struct drm_device *dev) | |
694 | { | |
695 | if (dev) | |
696 | kref_get(&dev->ref); | |
697 | } | |
698 | EXPORT_SYMBOL(drm_dev_ref); | |
699 | ||
700 | /** | |
701 | * drm_dev_unref - Drop reference of a DRM device | |
702 | * @dev: device to drop reference of or NULL | |
703 | * | |
704 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
705 | * ref-count drops to zero. | |
706 | */ | |
707 | void drm_dev_unref(struct drm_device *dev) | |
708 | { | |
709 | if (dev) | |
710 | kref_put(&dev->ref, drm_dev_release); | |
711 | } | |
712 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 713 | |
c22f0ace DH |
714 | /** |
715 | * drm_dev_register - Register DRM device | |
716 | * @dev: Device to register | |
c6a1af8a | 717 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
718 | * |
719 | * Register the DRM device @dev with the system, advertise device to user-space | |
720 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
54d2c2da AB |
721 | * previously. Right after drm_dev_register() the driver should call |
722 | * drm_connector_register_all() to register all connectors in sysfs. This is | |
723 | * a separate call for backward compatibility with drivers still using | |
724 | * the deprecated ->load() callback, where connectors are registered from within | |
725 | * the ->load() callback. | |
c22f0ace DH |
726 | * |
727 | * Never call this twice on any device! | |
728 | * | |
6e3f797c DV |
729 | * NOTE: To ensure backward compatibility with existing drivers method this |
730 | * function calls the ->load() method after registering the device nodes, | |
731 | * creating race conditions. Usage of the ->load() methods is therefore | |
732 | * deprecated, drivers must perform all initialization before calling | |
733 | * drm_dev_register(). | |
734 | * | |
c22f0ace DH |
735 | * RETURNS: |
736 | * 0 on success, negative error code on failure. | |
737 | */ | |
738 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
739 | { | |
740 | int ret; | |
741 | ||
742 | mutex_lock(&drm_global_mutex); | |
743 | ||
afcdbc86 | 744 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
745 | if (ret) |
746 | goto err_minors; | |
c22f0ace | 747 | |
afcdbc86 | 748 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
749 | if (ret) |
750 | goto err_minors; | |
c22f0ace | 751 | |
afcdbc86 | 752 | ret = drm_minor_register(dev, DRM_MINOR_LEGACY); |
c22f0ace | 753 | if (ret) |
05b701f6 | 754 | goto err_minors; |
c22f0ace DH |
755 | |
756 | if (dev->driver->load) { | |
757 | ret = dev->driver->load(dev, flags); | |
758 | if (ret) | |
05b701f6 | 759 | goto err_minors; |
c22f0ace DH |
760 | } |
761 | ||
c22f0ace DH |
762 | ret = 0; |
763 | goto out_unlock; | |
764 | ||
05b701f6 | 765 | err_minors: |
afcdbc86 DH |
766 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
767 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
768 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
769 | out_unlock: |
770 | mutex_unlock(&drm_global_mutex); | |
771 | return ret; | |
772 | } | |
773 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
774 | |
775 | /** | |
776 | * drm_dev_unregister - Unregister DRM device | |
777 | * @dev: Device to unregister | |
778 | * | |
779 | * Unregister the DRM device from the system. This does the reverse of | |
780 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 781 | * drm_dev_unref() to drop their final reference. |
6e3f797c DV |
782 | * |
783 | * This should be called first in the device teardown code to make sure | |
784 | * userspace can't access the device instance any more. | |
c3a49737 DH |
785 | */ |
786 | void drm_dev_unregister(struct drm_device *dev) | |
787 | { | |
788 | struct drm_map_list *r_list, *list_temp; | |
789 | ||
790 | drm_lastclose(dev); | |
791 | ||
792 | if (dev->driver->unload) | |
793 | dev->driver->unload(dev); | |
794 | ||
4efafebe DV |
795 | if (dev->agp) |
796 | drm_pci_agp_destroy(dev); | |
c3a49737 DH |
797 | |
798 | drm_vblank_cleanup(dev); | |
799 | ||
800 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) | |
9fc5cde7 | 801 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 802 | |
afcdbc86 DH |
803 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
804 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
805 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
806 | } |
807 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 TR |
808 | |
809 | /** | |
810 | * drm_dev_set_unique - Set the unique name of a DRM device | |
811 | * @dev: device of which to set the unique name | |
399368aa | 812 | * @name: unique name |
ca8e2ad7 | 813 | * |
399368aa NI |
814 | * Sets the unique name of a DRM device using the specified string. Drivers |
815 | * can use this at driver probe time if the unique name of the devices they | |
816 | * drive is static. | |
ca8e2ad7 TR |
817 | * |
818 | * Return: 0 on success or a negative error code on failure. | |
819 | */ | |
399368aa | 820 | int drm_dev_set_unique(struct drm_device *dev, const char *name) |
ca8e2ad7 | 821 | { |
ca8e2ad7 | 822 | kfree(dev->unique); |
399368aa | 823 | dev->unique = kstrdup(name, GFP_KERNEL); |
ca8e2ad7 TR |
824 | |
825 | return dev->unique ? 0 : -ENOMEM; | |
826 | } | |
827 | EXPORT_SYMBOL(drm_dev_set_unique); | |
1b7199fe DH |
828 | |
829 | /* | |
830 | * DRM Core | |
831 | * The DRM core module initializes all global DRM objects and makes them | |
832 | * available to drivers. Once setup, drivers can probe their respective | |
833 | * devices. | |
834 | * Currently, core management includes: | |
835 | * - The "DRM-Global" key/value database | |
836 | * - Global ID management for connectors | |
837 | * - DRM major number allocation | |
838 | * - DRM minor management | |
839 | * - DRM sysfs class | |
840 | * - DRM debugfs root | |
841 | * | |
842 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
843 | * interface registered on a DRM device, you can request minor numbers from DRM | |
844 | * core. DRM core takes care of major-number management and char-dev | |
845 | * registration. A stub ->open() callback forwards any open() requests to the | |
846 | * registered minor. | |
847 | */ | |
848 | ||
849 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
850 | { | |
851 | const struct file_operations *new_fops; | |
852 | struct drm_minor *minor; | |
853 | int err; | |
854 | ||
855 | DRM_DEBUG("\n"); | |
856 | ||
857 | mutex_lock(&drm_global_mutex); | |
858 | minor = drm_minor_acquire(iminor(inode)); | |
859 | if (IS_ERR(minor)) { | |
860 | err = PTR_ERR(minor); | |
861 | goto out_unlock; | |
862 | } | |
863 | ||
864 | new_fops = fops_get(minor->dev->driver->fops); | |
865 | if (!new_fops) { | |
866 | err = -ENODEV; | |
867 | goto out_release; | |
868 | } | |
869 | ||
870 | replace_fops(filp, new_fops); | |
871 | if (filp->f_op->open) | |
872 | err = filp->f_op->open(inode, filp); | |
873 | else | |
874 | err = 0; | |
875 | ||
876 | out_release: | |
877 | drm_minor_release(minor); | |
878 | out_unlock: | |
879 | mutex_unlock(&drm_global_mutex); | |
880 | return err; | |
881 | } | |
882 | ||
883 | static const struct file_operations drm_stub_fops = { | |
884 | .owner = THIS_MODULE, | |
885 | .open = drm_stub_open, | |
886 | .llseek = noop_llseek, | |
887 | }; | |
888 | ||
889 | static int __init drm_core_init(void) | |
890 | { | |
891 | int ret = -ENOMEM; | |
892 | ||
893 | drm_global_init(); | |
894 | drm_connector_ida_init(); | |
895 | idr_init(&drm_minors_idr); | |
896 | ||
897 | if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) | |
898 | goto err_p1; | |
899 | ||
fcc90213 DH |
900 | ret = drm_sysfs_init(); |
901 | if (ret < 0) { | |
1b7199fe | 902 | printk(KERN_ERR "DRM: Error creating drm class.\n"); |
1b7199fe DH |
903 | goto err_p2; |
904 | } | |
905 | ||
906 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
907 | if (!drm_debugfs_root) { | |
908 | DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); | |
909 | ret = -1; | |
910 | goto err_p3; | |
911 | } | |
912 | ||
913 | DRM_INFO("Initialized %s %d.%d.%d %s\n", | |
914 | CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); | |
915 | return 0; | |
916 | err_p3: | |
917 | drm_sysfs_destroy(); | |
918 | err_p2: | |
919 | unregister_chrdev(DRM_MAJOR, "drm"); | |
920 | ||
921 | idr_destroy(&drm_minors_idr); | |
922 | err_p1: | |
923 | return ret; | |
924 | } | |
925 | ||
926 | static void __exit drm_core_exit(void) | |
927 | { | |
928 | debugfs_remove(drm_debugfs_root); | |
929 | drm_sysfs_destroy(); | |
930 | ||
931 | unregister_chrdev(DRM_MAJOR, "drm"); | |
932 | ||
933 | drm_connector_ida_destroy(); | |
934 | idr_destroy(&drm_minors_idr); | |
935 | } | |
936 | ||
937 | module_init(drm_core_init); | |
938 | module_exit(drm_core_exit); |