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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" |
1da177e4 | 38 | |
b5e89ed5 | 39 | unsigned int drm_debug = 0; /* 1 to enable debug output */ |
1da177e4 LT |
40 | EXPORT_SYMBOL(drm_debug); |
41 | ||
b5e89ed5 DA |
42 | MODULE_AUTHOR(CORE_AUTHOR); |
43 | MODULE_DESCRIPTION(CORE_DESC); | |
1da177e4 | 44 | MODULE_LICENSE("GPL and additional rights"); |
1da177e4 | 45 | MODULE_PARM_DESC(debug, "Enable debug output"); |
4ed0ce3d | 46 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
27641c3f | 47 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); |
c61eef72 | 48 | MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); |
1da177e4 | 49 | |
c0758146 | 50 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 51 | |
0d639883 | 52 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 53 | static struct idr drm_minors_idr; |
2c14f28b | 54 | |
0650fd58 | 55 | struct class *drm_class; |
1b7199fe | 56 | static struct dentry *drm_debugfs_root; |
5ad3d883 JP |
57 | |
58 | int drm_err(const char *func, const char *format, ...) | |
59 | { | |
60 | struct va_format vaf; | |
61 | va_list args; | |
62 | int r; | |
63 | ||
64 | va_start(args, format); | |
65 | ||
66 | vaf.fmt = format; | |
67 | vaf.va = &args; | |
68 | ||
69 | r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf); | |
70 | ||
71 | va_end(args); | |
72 | ||
73 | return r; | |
74 | } | |
75 | EXPORT_SYMBOL(drm_err); | |
76 | ||
1287aa90 | 77 | void drm_ut_debug_printk(const char *function_name, const char *format, ...) |
4fefcb27 | 78 | { |
fffb9065 | 79 | struct va_format vaf; |
4fefcb27 | 80 | va_list args; |
1da177e4 | 81 | |
a73d4e91 LD |
82 | va_start(args, format); |
83 | vaf.fmt = format; | |
84 | vaf.va = &args; | |
85 | ||
0ed02983 | 86 | printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf); |
a73d4e91 LD |
87 | |
88 | va_end(args); | |
4fefcb27 | 89 | } |
90 | EXPORT_SYMBOL(drm_ut_debug_printk); | |
5ad3d883 | 91 | |
7c1c2871 DA |
92 | struct drm_master *drm_master_create(struct drm_minor *minor) |
93 | { | |
94 | struct drm_master *master; | |
95 | ||
9a298b2a | 96 | master = kzalloc(sizeof(*master), GFP_KERNEL); |
7c1c2871 DA |
97 | if (!master) |
98 | return NULL; | |
99 | ||
100 | kref_init(&master->refcount); | |
101 | spin_lock_init(&master->lock.spinlock); | |
102 | init_waitqueue_head(&master->lock.lock_queue); | |
10e68569 DV |
103 | if (drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER)) { |
104 | kfree(master); | |
105 | return NULL; | |
106 | } | |
7c1c2871 DA |
107 | INIT_LIST_HEAD(&master->magicfree); |
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 | } | |
136 | ||
7c1c2871 | 137 | if (master->unique) { |
9a298b2a | 138 | kfree(master->unique); |
7c1c2871 DA |
139 | master->unique = NULL; |
140 | master->unique_len = 0; | |
141 | } | |
142 | ||
7c1c2871 DA |
143 | drm_ht_remove(&master->magiclist); |
144 | ||
c996fd0b | 145 | mutex_unlock(&dev->struct_mutex); |
9a298b2a | 146 | kfree(master); |
7c1c2871 DA |
147 | } |
148 | ||
149 | void drm_master_put(struct drm_master **master) | |
150 | { | |
151 | kref_put(&(*master)->refcount, drm_master_destroy); | |
152 | *master = NULL; | |
153 | } | |
85bb0c37 | 154 | EXPORT_SYMBOL(drm_master_put); |
7c1c2871 DA |
155 | |
156 | int drm_setmaster_ioctl(struct drm_device *dev, void *data, | |
157 | struct drm_file *file_priv) | |
158 | { | |
53ef1600 | 159 | int ret = 0; |
862302ff | 160 | |
c996fd0b | 161 | mutex_lock(&dev->master_mutex); |
7963e9db | 162 | if (file_priv->is_master) |
c996fd0b | 163 | goto out_unlock; |
7c1c2871 | 164 | |
c996fd0b TH |
165 | if (file_priv->minor->master) { |
166 | ret = -EINVAL; | |
167 | goto out_unlock; | |
168 | } | |
7c1c2871 | 169 | |
c996fd0b TH |
170 | if (!file_priv->master) { |
171 | ret = -EINVAL; | |
172 | goto out_unlock; | |
173 | } | |
08bec5b4 | 174 | |
08bec5b4 | 175 | file_priv->minor->master = drm_master_get(file_priv->master); |
7963e9db | 176 | file_priv->is_master = 1; |
08bec5b4 DH |
177 | if (dev->driver->master_set) { |
178 | ret = dev->driver->master_set(dev, file_priv, false); | |
7963e9db DA |
179 | if (unlikely(ret != 0)) { |
180 | file_priv->is_master = 0; | |
08bec5b4 | 181 | drm_master_put(&file_priv->minor->master); |
7963e9db | 182 | } |
7c1c2871 DA |
183 | } |
184 | ||
c996fd0b TH |
185 | out_unlock: |
186 | mutex_unlock(&dev->master_mutex); | |
53ef1600 | 187 | return ret; |
7c1c2871 DA |
188 | } |
189 | ||
190 | int drm_dropmaster_ioctl(struct drm_device *dev, void *data, | |
191 | struct drm_file *file_priv) | |
192 | { | |
c996fd0b TH |
193 | int ret = -EINVAL; |
194 | ||
195 | mutex_lock(&dev->master_mutex); | |
7963e9db | 196 | if (!file_priv->is_master) |
c996fd0b | 197 | goto out_unlock; |
6b008426 | 198 | |
07f1c7a7 | 199 | if (!file_priv->minor->master) |
c996fd0b | 200 | goto out_unlock; |
07f1c7a7 | 201 | |
c996fd0b | 202 | ret = 0; |
862302ff TH |
203 | if (dev->driver->master_drop) |
204 | dev->driver->master_drop(dev, file_priv, false); | |
7c1c2871 | 205 | drm_master_put(&file_priv->minor->master); |
7963e9db | 206 | file_priv->is_master = 0; |
c996fd0b TH |
207 | |
208 | out_unlock: | |
209 | mutex_unlock(&dev->master_mutex); | |
210 | return ret; | |
7c1c2871 DA |
211 | } |
212 | ||
0d639883 DH |
213 | /* |
214 | * DRM Minors | |
215 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
216 | * of them is represented by a drm_minor object. Depending on the capabilities | |
217 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 218 | * |
0d639883 DH |
219 | * Minors can be accessed via dev->$minor_name. This pointer is either |
220 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
221 | * valid. This means, DRM minors have the same life-time as the underlying | |
222 | * device. However, this doesn't mean that the minor is active. Minors are | |
223 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 224 | */ |
0d639883 | 225 | |
05b701f6 DH |
226 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
227 | unsigned int type) | |
228 | { | |
229 | switch (type) { | |
230 | case DRM_MINOR_LEGACY: | |
231 | return &dev->primary; | |
232 | case DRM_MINOR_RENDER: | |
233 | return &dev->render; | |
234 | case DRM_MINOR_CONTROL: | |
235 | return &dev->control; | |
236 | default: | |
237 | return NULL; | |
238 | } | |
239 | } | |
240 | ||
241 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
242 | { | |
243 | struct drm_minor *minor; | |
f1b85962 DH |
244 | unsigned long flags; |
245 | int r; | |
05b701f6 DH |
246 | |
247 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
248 | if (!minor) | |
249 | return -ENOMEM; | |
250 | ||
251 | minor->type = type; | |
252 | minor->dev = dev; | |
05b701f6 | 253 | |
f1b85962 DH |
254 | idr_preload(GFP_KERNEL); |
255 | spin_lock_irqsave(&drm_minor_lock, flags); | |
256 | r = idr_alloc(&drm_minors_idr, | |
257 | NULL, | |
258 | 64 * type, | |
259 | 64 * (type + 1), | |
260 | GFP_NOWAIT); | |
261 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
262 | idr_preload_end(); | |
263 | ||
264 | if (r < 0) | |
265 | goto err_free; | |
266 | ||
267 | minor->index = r; | |
268 | ||
e1728075 DH |
269 | minor->kdev = drm_sysfs_minor_alloc(minor); |
270 | if (IS_ERR(minor->kdev)) { | |
271 | r = PTR_ERR(minor->kdev); | |
272 | goto err_index; | |
273 | } | |
274 | ||
05b701f6 DH |
275 | *drm_minor_get_slot(dev, type) = minor; |
276 | return 0; | |
f1b85962 | 277 | |
e1728075 DH |
278 | err_index: |
279 | spin_lock_irqsave(&drm_minor_lock, flags); | |
280 | idr_remove(&drm_minors_idr, minor->index); | |
281 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
282 | err_free: |
283 | kfree(minor); | |
284 | return r; | |
05b701f6 DH |
285 | } |
286 | ||
bd9dfa98 DH |
287 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
288 | { | |
f1b85962 DH |
289 | struct drm_minor **slot, *minor; |
290 | unsigned long flags; | |
bd9dfa98 DH |
291 | |
292 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
293 | minor = *slot; |
294 | if (!minor) | |
295 | return; | |
296 | ||
297 | drm_mode_group_destroy(&minor->mode_group); | |
e1728075 | 298 | put_device(minor->kdev); |
f1b85962 DH |
299 | |
300 | spin_lock_irqsave(&drm_minor_lock, flags); | |
301 | idr_remove(&drm_minors_idr, minor->index); | |
302 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
303 | ||
304 | kfree(minor); | |
305 | *slot = NULL; | |
bd9dfa98 DH |
306 | } |
307 | ||
afcdbc86 | 308 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 309 | { |
f1b85962 | 310 | struct drm_minor *minor; |
0d639883 | 311 | unsigned long flags; |
1da177e4 | 312 | int ret; |
1da177e4 LT |
313 | |
314 | DRM_DEBUG("\n"); | |
315 | ||
f1b85962 DH |
316 | minor = *drm_minor_get_slot(dev, type); |
317 | if (!minor) | |
05b701f6 DH |
318 | return 0; |
319 | ||
f1b85962 | 320 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 321 | if (ret) { |
156f5a78 | 322 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
f1b85962 | 323 | return ret; |
955b12de | 324 | } |
2c14f28b | 325 | |
e1728075 DH |
326 | ret = device_add(minor->kdev); |
327 | if (ret) | |
cb6458f9 | 328 | goto err_debugfs; |
2c14f28b | 329 | |
0d639883 DH |
330 | /* replace NULL with @minor so lookups will succeed from now on */ |
331 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 332 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 333 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 334 | |
f1b85962 | 335 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
336 | return 0; |
337 | ||
cb6458f9 | 338 | err_debugfs: |
f1b85962 | 339 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
340 | return ret; |
341 | } | |
b5e89ed5 | 342 | |
afcdbc86 | 343 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 344 | { |
afcdbc86 | 345 | struct drm_minor *minor; |
0d639883 | 346 | unsigned long flags; |
afcdbc86 DH |
347 | |
348 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 349 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
350 | return; |
351 | ||
f1b85962 | 352 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 353 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 354 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 355 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 356 | |
e1728075 DH |
357 | device_del(minor->kdev); |
358 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 359 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
360 | } |
361 | ||
362 | /** | |
1616c525 DH |
363 | * drm_minor_acquire - Acquire a DRM minor |
364 | * @minor_id: Minor ID of the DRM-minor | |
365 | * | |
366 | * Looks up the given minor-ID and returns the respective DRM-minor object. The | |
367 | * refence-count of the underlying device is increased so you must release this | |
368 | * object with drm_minor_release(). | |
369 | * | |
370 | * As long as you hold this minor, it is guaranteed that the object and the | |
371 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
372 | * unregistered while you hold the minor. | |
f73aca50 | 373 | * |
1616c525 DH |
374 | * Returns: |
375 | * Pointer to minor-object with increased device-refcount, or PTR_ERR on | |
376 | * failure. | |
1da177e4 | 377 | */ |
1616c525 | 378 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 379 | { |
1616c525 | 380 | struct drm_minor *minor; |
0d639883 | 381 | unsigned long flags; |
1616c525 | 382 | |
0d639883 | 383 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 384 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 DH |
385 | if (minor) |
386 | drm_dev_ref(minor->dev); | |
387 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
388 | ||
389 | if (!minor) { | |
390 | return ERR_PTR(-ENODEV); | |
391 | } else if (drm_device_is_unplugged(minor->dev)) { | |
392 | drm_dev_unref(minor->dev); | |
1616c525 | 393 | return ERR_PTR(-ENODEV); |
0d639883 | 394 | } |
673a394b | 395 | |
1616c525 DH |
396 | return minor; |
397 | } | |
b5e89ed5 | 398 | |
1616c525 DH |
399 | /** |
400 | * drm_minor_release - Release DRM minor | |
401 | * @minor: Pointer to DRM minor object | |
402 | * | |
403 | * Release a minor that was previously acquired via drm_minor_acquire(). | |
404 | */ | |
405 | void drm_minor_release(struct drm_minor *minor) | |
406 | { | |
407 | drm_dev_unref(minor->dev); | |
1da177e4 | 408 | } |
112b715e KH |
409 | |
410 | /** | |
c6a1af8a TR |
411 | * drm_put_dev - Unregister and release a DRM device |
412 | * @dev: DRM device | |
112b715e | 413 | * |
c6a1af8a | 414 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 415 | * |
c6a1af8a TR |
416 | * Use of this function is discouraged. It will eventually go away completely. |
417 | * Please use drm_dev_unregister() and drm_dev_unref() explicitly instead. | |
418 | * | |
419 | * Cleans up all DRM device, calling drm_lastclose(). | |
112b715e KH |
420 | */ |
421 | void drm_put_dev(struct drm_device *dev) | |
422 | { | |
112b715e KH |
423 | DRM_DEBUG("\n"); |
424 | ||
425 | if (!dev) { | |
426 | DRM_ERROR("cleanup called no dev\n"); | |
427 | return; | |
428 | } | |
429 | ||
c3a49737 | 430 | drm_dev_unregister(dev); |
099d1c29 | 431 | drm_dev_unref(dev); |
112b715e KH |
432 | } |
433 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
434 | |
435 | void drm_unplug_dev(struct drm_device *dev) | |
436 | { | |
437 | /* for a USB device */ | |
afcdbc86 DH |
438 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
439 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
440 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
2c07a21d DA |
441 | |
442 | mutex_lock(&drm_global_mutex); | |
443 | ||
444 | drm_device_set_unplugged(dev); | |
445 | ||
446 | if (dev->open_count == 0) { | |
447 | drm_put_dev(dev); | |
448 | } | |
449 | mutex_unlock(&drm_global_mutex); | |
450 | } | |
451 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 452 | |
31bbe16f DH |
453 | /* |
454 | * DRM internal mount | |
455 | * We want to be able to allocate our own "struct address_space" to control | |
456 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
457 | * stand-alone address_space objects, so we need an underlying inode. As there | |
458 | * is no way to allocate an independent inode easily, we need a fake internal | |
459 | * VFS mount-point. | |
460 | * | |
461 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
462 | * frees it again. You are allowed to use iget() and iput() to get references to | |
463 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
464 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
465 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
466 | * between multiple inode-users. You could, technically, call | |
467 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
468 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
469 | */ | |
470 | ||
471 | static int drm_fs_cnt; | |
472 | static struct vfsmount *drm_fs_mnt; | |
473 | ||
474 | static const struct dentry_operations drm_fs_dops = { | |
475 | .d_dname = simple_dname, | |
476 | }; | |
477 | ||
478 | static const struct super_operations drm_fs_sops = { | |
479 | .statfs = simple_statfs, | |
480 | }; | |
481 | ||
482 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
483 | const char *dev_name, void *data) | |
484 | { | |
485 | return mount_pseudo(fs_type, | |
486 | "drm:", | |
487 | &drm_fs_sops, | |
488 | &drm_fs_dops, | |
489 | 0x010203ff); | |
490 | } | |
491 | ||
492 | static struct file_system_type drm_fs_type = { | |
493 | .name = "drm", | |
494 | .owner = THIS_MODULE, | |
495 | .mount = drm_fs_mount, | |
496 | .kill_sb = kill_anon_super, | |
497 | }; | |
498 | ||
499 | static struct inode *drm_fs_inode_new(void) | |
500 | { | |
501 | struct inode *inode; | |
502 | int r; | |
503 | ||
504 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
505 | if (r < 0) { | |
506 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
507 | return ERR_PTR(r); | |
508 | } | |
509 | ||
510 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
511 | if (IS_ERR(inode)) | |
512 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
513 | ||
514 | return inode; | |
515 | } | |
516 | ||
517 | static void drm_fs_inode_free(struct inode *inode) | |
518 | { | |
519 | if (inode) { | |
520 | iput(inode); | |
521 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
522 | } | |
523 | } | |
524 | ||
1bb72532 | 525 | /** |
c6a1af8a | 526 | * drm_dev_alloc - Allocate new DRM device |
1bb72532 DH |
527 | * @driver: DRM driver to allocate device for |
528 | * @parent: Parent device object | |
529 | * | |
530 | * Allocate and initialize a new DRM device. No device registration is done. | |
c22f0ace DH |
531 | * Call drm_dev_register() to advertice the device to user space and register it |
532 | * with other core subsystems. | |
1bb72532 | 533 | * |
099d1c29 DH |
534 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
535 | * drm_dev_unref() to take and drop further ref-counts. | |
536 | * | |
1bb72532 DH |
537 | * RETURNS: |
538 | * Pointer to new DRM device, or NULL if out of memory. | |
539 | */ | |
540 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
541 | struct device *parent) | |
542 | { | |
543 | struct drm_device *dev; | |
544 | int ret; | |
545 | ||
546 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
547 | if (!dev) | |
548 | return NULL; | |
549 | ||
099d1c29 | 550 | kref_init(&dev->ref); |
1bb72532 DH |
551 | dev->dev = parent; |
552 | dev->driver = driver; | |
553 | ||
554 | INIT_LIST_HEAD(&dev->filelist); | |
555 | INIT_LIST_HEAD(&dev->ctxlist); | |
556 | INIT_LIST_HEAD(&dev->vmalist); | |
557 | INIT_LIST_HEAD(&dev->maplist); | |
558 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
559 | ||
2177a218 | 560 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
561 | spin_lock_init(&dev->event_lock); |
562 | mutex_init(&dev->struct_mutex); | |
563 | mutex_init(&dev->ctxlist_mutex); | |
c996fd0b | 564 | mutex_init(&dev->master_mutex); |
1bb72532 | 565 | |
6796cb16 DH |
566 | dev->anon_inode = drm_fs_inode_new(); |
567 | if (IS_ERR(dev->anon_inode)) { | |
568 | ret = PTR_ERR(dev->anon_inode); | |
569 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 570 | goto err_free; |
6796cb16 DH |
571 | } |
572 | ||
05b701f6 DH |
573 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
574 | ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); | |
575 | if (ret) | |
576 | goto err_minors; | |
577 | } | |
578 | ||
6d6dfcfb | 579 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
580 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
581 | if (ret) | |
582 | goto err_minors; | |
583 | } | |
584 | ||
585 | ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY); | |
586 | if (ret) | |
587 | goto err_minors; | |
588 | ||
6796cb16 | 589 | if (drm_ht_create(&dev->map_hash, 12)) |
05b701f6 | 590 | goto err_minors; |
1bb72532 | 591 | |
e7b96070 | 592 | ret = drm_legacy_ctxbitmap_init(dev); |
1bb72532 DH |
593 | if (ret) { |
594 | DRM_ERROR("Cannot allocate memory for context bitmap.\n"); | |
595 | goto err_ht; | |
596 | } | |
597 | ||
598 | if (driver->driver_features & DRIVER_GEM) { | |
599 | ret = drm_gem_init(dev); | |
600 | if (ret) { | |
601 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
602 | goto err_ctxbitmap; | |
603 | } | |
604 | } | |
605 | ||
606 | return dev; | |
607 | ||
608 | err_ctxbitmap: | |
e7b96070 | 609 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 DH |
610 | err_ht: |
611 | drm_ht_remove(&dev->map_hash); | |
05b701f6 | 612 | err_minors: |
bd9dfa98 DH |
613 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
614 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
615 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 616 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 617 | err_free: |
c996fd0b | 618 | mutex_destroy(&dev->master_mutex); |
1bb72532 DH |
619 | kfree(dev); |
620 | return NULL; | |
621 | } | |
622 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 623 | |
099d1c29 | 624 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 625 | { |
099d1c29 | 626 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 627 | |
0dc8fe59 DH |
628 | if (dev->driver->driver_features & DRIVER_GEM) |
629 | drm_gem_destroy(dev); | |
630 | ||
e7b96070 | 631 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 632 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 633 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 634 | |
bd9dfa98 DH |
635 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
636 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
637 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
638 | ||
c996fd0b | 639 | mutex_destroy(&dev->master_mutex); |
ca8e2ad7 | 640 | kfree(dev->unique); |
0dc8fe59 DH |
641 | kfree(dev); |
642 | } | |
099d1c29 DH |
643 | |
644 | /** | |
645 | * drm_dev_ref - Take reference of a DRM device | |
646 | * @dev: device to take reference of or NULL | |
647 | * | |
648 | * This increases the ref-count of @dev by one. You *must* already own a | |
649 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
650 | * again. | |
651 | * | |
652 | * This function never fails. However, this function does not provide *any* | |
653 | * guarantee whether the device is alive or running. It only provides a | |
654 | * reference to the object and the memory associated with it. | |
655 | */ | |
656 | void drm_dev_ref(struct drm_device *dev) | |
657 | { | |
658 | if (dev) | |
659 | kref_get(&dev->ref); | |
660 | } | |
661 | EXPORT_SYMBOL(drm_dev_ref); | |
662 | ||
663 | /** | |
664 | * drm_dev_unref - Drop reference of a DRM device | |
665 | * @dev: device to drop reference of or NULL | |
666 | * | |
667 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
668 | * ref-count drops to zero. | |
669 | */ | |
670 | void drm_dev_unref(struct drm_device *dev) | |
671 | { | |
672 | if (dev) | |
673 | kref_put(&dev->ref, drm_dev_release); | |
674 | } | |
675 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 676 | |
c22f0ace DH |
677 | /** |
678 | * drm_dev_register - Register DRM device | |
679 | * @dev: Device to register | |
c6a1af8a | 680 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
681 | * |
682 | * Register the DRM device @dev with the system, advertise device to user-space | |
683 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
684 | * previously. | |
685 | * | |
686 | * Never call this twice on any device! | |
687 | * | |
688 | * RETURNS: | |
689 | * 0 on success, negative error code on failure. | |
690 | */ | |
691 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
692 | { | |
693 | int ret; | |
694 | ||
695 | mutex_lock(&drm_global_mutex); | |
696 | ||
afcdbc86 | 697 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
698 | if (ret) |
699 | goto err_minors; | |
c22f0ace | 700 | |
afcdbc86 | 701 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
702 | if (ret) |
703 | goto err_minors; | |
c22f0ace | 704 | |
afcdbc86 | 705 | ret = drm_minor_register(dev, DRM_MINOR_LEGACY); |
c22f0ace | 706 | if (ret) |
05b701f6 | 707 | goto err_minors; |
c22f0ace DH |
708 | |
709 | if (dev->driver->load) { | |
710 | ret = dev->driver->load(dev, flags); | |
711 | if (ret) | |
05b701f6 | 712 | goto err_minors; |
c22f0ace DH |
713 | } |
714 | ||
715 | /* setup grouping for legacy outputs */ | |
716 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
717 | ret = drm_mode_group_init_legacy_group(dev, | |
718 | &dev->primary->mode_group); | |
719 | if (ret) | |
720 | goto err_unload; | |
721 | } | |
722 | ||
c22f0ace DH |
723 | ret = 0; |
724 | goto out_unlock; | |
725 | ||
726 | err_unload: | |
727 | if (dev->driver->unload) | |
728 | dev->driver->unload(dev); | |
05b701f6 | 729 | err_minors: |
afcdbc86 DH |
730 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
731 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
732 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
733 | out_unlock: |
734 | mutex_unlock(&drm_global_mutex); | |
735 | return ret; | |
736 | } | |
737 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
738 | |
739 | /** | |
740 | * drm_dev_unregister - Unregister DRM device | |
741 | * @dev: Device to unregister | |
742 | * | |
743 | * Unregister the DRM device from the system. This does the reverse of | |
744 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 745 | * drm_dev_unref() to drop their final reference. |
c3a49737 DH |
746 | */ |
747 | void drm_dev_unregister(struct drm_device *dev) | |
748 | { | |
749 | struct drm_map_list *r_list, *list_temp; | |
750 | ||
751 | drm_lastclose(dev); | |
752 | ||
753 | if (dev->driver->unload) | |
754 | dev->driver->unload(dev); | |
755 | ||
4efafebe DV |
756 | if (dev->agp) |
757 | drm_pci_agp_destroy(dev); | |
c3a49737 DH |
758 | |
759 | drm_vblank_cleanup(dev); | |
760 | ||
761 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) | |
9fc5cde7 | 762 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 763 | |
afcdbc86 DH |
764 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
765 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
766 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
767 | } |
768 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 TR |
769 | |
770 | /** | |
771 | * drm_dev_set_unique - Set the unique name of a DRM device | |
772 | * @dev: device of which to set the unique name | |
773 | * @fmt: format string for unique name | |
774 | * | |
775 | * Sets the unique name of a DRM device using the specified format string and | |
776 | * a variable list of arguments. Drivers can use this at driver probe time if | |
777 | * the unique name of the devices they drive is static. | |
778 | * | |
779 | * Return: 0 on success or a negative error code on failure. | |
780 | */ | |
781 | int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...) | |
782 | { | |
783 | va_list ap; | |
784 | ||
785 | kfree(dev->unique); | |
786 | ||
787 | va_start(ap, fmt); | |
788 | dev->unique = kvasprintf(GFP_KERNEL, fmt, ap); | |
789 | va_end(ap); | |
790 | ||
791 | return dev->unique ? 0 : -ENOMEM; | |
792 | } | |
793 | EXPORT_SYMBOL(drm_dev_set_unique); | |
1b7199fe DH |
794 | |
795 | /* | |
796 | * DRM Core | |
797 | * The DRM core module initializes all global DRM objects and makes them | |
798 | * available to drivers. Once setup, drivers can probe their respective | |
799 | * devices. | |
800 | * Currently, core management includes: | |
801 | * - The "DRM-Global" key/value database | |
802 | * - Global ID management for connectors | |
803 | * - DRM major number allocation | |
804 | * - DRM minor management | |
805 | * - DRM sysfs class | |
806 | * - DRM debugfs root | |
807 | * | |
808 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
809 | * interface registered on a DRM device, you can request minor numbers from DRM | |
810 | * core. DRM core takes care of major-number management and char-dev | |
811 | * registration. A stub ->open() callback forwards any open() requests to the | |
812 | * registered minor. | |
813 | */ | |
814 | ||
815 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
816 | { | |
817 | const struct file_operations *new_fops; | |
818 | struct drm_minor *minor; | |
819 | int err; | |
820 | ||
821 | DRM_DEBUG("\n"); | |
822 | ||
823 | mutex_lock(&drm_global_mutex); | |
824 | minor = drm_minor_acquire(iminor(inode)); | |
825 | if (IS_ERR(minor)) { | |
826 | err = PTR_ERR(minor); | |
827 | goto out_unlock; | |
828 | } | |
829 | ||
830 | new_fops = fops_get(minor->dev->driver->fops); | |
831 | if (!new_fops) { | |
832 | err = -ENODEV; | |
833 | goto out_release; | |
834 | } | |
835 | ||
836 | replace_fops(filp, new_fops); | |
837 | if (filp->f_op->open) | |
838 | err = filp->f_op->open(inode, filp); | |
839 | else | |
840 | err = 0; | |
841 | ||
842 | out_release: | |
843 | drm_minor_release(minor); | |
844 | out_unlock: | |
845 | mutex_unlock(&drm_global_mutex); | |
846 | return err; | |
847 | } | |
848 | ||
849 | static const struct file_operations drm_stub_fops = { | |
850 | .owner = THIS_MODULE, | |
851 | .open = drm_stub_open, | |
852 | .llseek = noop_llseek, | |
853 | }; | |
854 | ||
855 | static int __init drm_core_init(void) | |
856 | { | |
857 | int ret = -ENOMEM; | |
858 | ||
859 | drm_global_init(); | |
860 | drm_connector_ida_init(); | |
861 | idr_init(&drm_minors_idr); | |
862 | ||
863 | if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) | |
864 | goto err_p1; | |
865 | ||
866 | drm_class = drm_sysfs_create(THIS_MODULE, "drm"); | |
867 | if (IS_ERR(drm_class)) { | |
868 | printk(KERN_ERR "DRM: Error creating drm class.\n"); | |
869 | ret = PTR_ERR(drm_class); | |
870 | goto err_p2; | |
871 | } | |
872 | ||
873 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
874 | if (!drm_debugfs_root) { | |
875 | DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); | |
876 | ret = -1; | |
877 | goto err_p3; | |
878 | } | |
879 | ||
880 | DRM_INFO("Initialized %s %d.%d.%d %s\n", | |
881 | CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); | |
882 | return 0; | |
883 | err_p3: | |
884 | drm_sysfs_destroy(); | |
885 | err_p2: | |
886 | unregister_chrdev(DRM_MAJOR, "drm"); | |
887 | ||
888 | idr_destroy(&drm_minors_idr); | |
889 | err_p1: | |
890 | return ret; | |
891 | } | |
892 | ||
893 | static void __exit drm_core_exit(void) | |
894 | { | |
895 | debugfs_remove(drm_debugfs_root); | |
896 | drm_sysfs_destroy(); | |
897 | ||
898 | unregister_chrdev(DRM_MAJOR, "drm"); | |
899 | ||
900 | drm_connector_ida_destroy(); | |
901 | idr_destroy(&drm_minors_idr); | |
902 | } | |
903 | ||
904 | module_init(drm_core_init); | |
905 | module_exit(drm_core_exit); |