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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 | |
b5e89ed5 | 40 | unsigned int drm_debug = 0; /* 1 to enable debug output */ |
1da177e4 LT |
41 | EXPORT_SYMBOL(drm_debug); |
42 | ||
b5e89ed5 DA |
43 | MODULE_AUTHOR(CORE_AUTHOR); |
44 | MODULE_DESCRIPTION(CORE_DESC); | |
1da177e4 | 45 | MODULE_LICENSE("GPL and additional rights"); |
1da177e4 | 46 | MODULE_PARM_DESC(debug, "Enable debug output"); |
4ed0ce3d | 47 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
27641c3f | 48 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); |
c61eef72 | 49 | MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); |
1da177e4 | 50 | |
c0758146 | 51 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 52 | |
0d639883 | 53 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 54 | static struct idr drm_minors_idr; |
2c14f28b | 55 | |
0650fd58 | 56 | struct class *drm_class; |
1b7199fe | 57 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 58 | |
a1f1a79c | 59 | void drm_err(const char *format, ...) |
5ad3d883 JP |
60 | { |
61 | struct va_format vaf; | |
62 | va_list args; | |
5ad3d883 JP |
63 | |
64 | va_start(args, format); | |
65 | ||
66 | vaf.fmt = format; | |
67 | vaf.va = &args; | |
68 | ||
a1f1a79c JP |
69 | printk(KERN_ERR "[" DRM_NAME ":%pf] *ERROR* %pV", |
70 | __builtin_return_address(0), &vaf); | |
5ad3d883 JP |
71 | |
72 | va_end(args); | |
5ad3d883 JP |
73 | } |
74 | EXPORT_SYMBOL(drm_err); | |
75 | ||
1287aa90 | 76 | void drm_ut_debug_printk(const char *function_name, const char *format, ...) |
4fefcb27 | 77 | { |
fffb9065 | 78 | struct va_format vaf; |
4fefcb27 | 79 | va_list args; |
1da177e4 | 80 | |
a73d4e91 LD |
81 | va_start(args, format); |
82 | vaf.fmt = format; | |
83 | vaf.va = &args; | |
84 | ||
0ed02983 | 85 | printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf); |
a73d4e91 LD |
86 | |
87 | va_end(args); | |
4fefcb27 | 88 | } |
89 | EXPORT_SYMBOL(drm_ut_debug_printk); | |
5ad3d883 | 90 | |
6865b20a DV |
91 | #define DRM_MAGIC_HASH_ORDER 4 /**< Size of key hash table. Must be power of 2. */ |
92 | ||
7c1c2871 DA |
93 | struct drm_master *drm_master_create(struct drm_minor *minor) |
94 | { | |
95 | struct drm_master *master; | |
96 | ||
9a298b2a | 97 | master = kzalloc(sizeof(*master), GFP_KERNEL); |
7c1c2871 DA |
98 | if (!master) |
99 | return NULL; | |
100 | ||
101 | kref_init(&master->refcount); | |
102 | spin_lock_init(&master->lock.spinlock); | |
103 | init_waitqueue_head(&master->lock.lock_queue); | |
10e68569 DV |
104 | if (drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER)) { |
105 | kfree(master); | |
106 | return NULL; | |
107 | } | |
7c1c2871 DA |
108 | INIT_LIST_HEAD(&master->magicfree); |
109 | master->minor = minor; | |
110 | ||
7c1c2871 DA |
111 | return master; |
112 | } | |
113 | ||
114 | struct drm_master *drm_master_get(struct drm_master *master) | |
115 | { | |
116 | kref_get(&master->refcount); | |
117 | return master; | |
118 | } | |
85bb0c37 | 119 | EXPORT_SYMBOL(drm_master_get); |
7c1c2871 DA |
120 | |
121 | static void drm_master_destroy(struct kref *kref) | |
122 | { | |
123 | struct drm_master *master = container_of(kref, struct drm_master, refcount); | |
7c1c2871 | 124 | struct drm_device *dev = master->minor->dev; |
c1ff85d9 | 125 | struct drm_map_list *r_list, *list_temp; |
7c1c2871 | 126 | |
c996fd0b | 127 | mutex_lock(&dev->struct_mutex); |
7c1c2871 DA |
128 | if (dev->driver->master_destroy) |
129 | dev->driver->master_destroy(dev, master); | |
130 | ||
c1ff85d9 DA |
131 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) { |
132 | if (r_list->master == master) { | |
9fc5cde7 | 133 | drm_legacy_rmmap_locked(dev, r_list->map); |
c1ff85d9 DA |
134 | r_list = NULL; |
135 | } | |
136 | } | |
137 | ||
7c1c2871 | 138 | if (master->unique) { |
9a298b2a | 139 | kfree(master->unique); |
7c1c2871 DA |
140 | master->unique = NULL; |
141 | master->unique_len = 0; | |
142 | } | |
143 | ||
7c1c2871 DA |
144 | drm_ht_remove(&master->magiclist); |
145 | ||
c996fd0b | 146 | mutex_unlock(&dev->struct_mutex); |
9a298b2a | 147 | kfree(master); |
7c1c2871 DA |
148 | } |
149 | ||
150 | void drm_master_put(struct drm_master **master) | |
151 | { | |
152 | kref_put(&(*master)->refcount, drm_master_destroy); | |
153 | *master = NULL; | |
154 | } | |
85bb0c37 | 155 | EXPORT_SYMBOL(drm_master_put); |
7c1c2871 DA |
156 | |
157 | int drm_setmaster_ioctl(struct drm_device *dev, void *data, | |
158 | struct drm_file *file_priv) | |
159 | { | |
53ef1600 | 160 | int ret = 0; |
862302ff | 161 | |
c996fd0b | 162 | mutex_lock(&dev->master_mutex); |
7963e9db | 163 | if (file_priv->is_master) |
c996fd0b | 164 | goto out_unlock; |
7c1c2871 | 165 | |
c996fd0b TH |
166 | if (file_priv->minor->master) { |
167 | ret = -EINVAL; | |
168 | goto out_unlock; | |
169 | } | |
7c1c2871 | 170 | |
c996fd0b TH |
171 | if (!file_priv->master) { |
172 | ret = -EINVAL; | |
173 | goto out_unlock; | |
174 | } | |
08bec5b4 | 175 | |
08bec5b4 | 176 | file_priv->minor->master = drm_master_get(file_priv->master); |
7963e9db | 177 | file_priv->is_master = 1; |
08bec5b4 DH |
178 | if (dev->driver->master_set) { |
179 | ret = dev->driver->master_set(dev, file_priv, false); | |
7963e9db DA |
180 | if (unlikely(ret != 0)) { |
181 | file_priv->is_master = 0; | |
08bec5b4 | 182 | drm_master_put(&file_priv->minor->master); |
7963e9db | 183 | } |
7c1c2871 DA |
184 | } |
185 | ||
c996fd0b TH |
186 | out_unlock: |
187 | mutex_unlock(&dev->master_mutex); | |
53ef1600 | 188 | return ret; |
7c1c2871 DA |
189 | } |
190 | ||
191 | int drm_dropmaster_ioctl(struct drm_device *dev, void *data, | |
192 | struct drm_file *file_priv) | |
193 | { | |
c996fd0b TH |
194 | int ret = -EINVAL; |
195 | ||
196 | mutex_lock(&dev->master_mutex); | |
7963e9db | 197 | if (!file_priv->is_master) |
c996fd0b | 198 | goto out_unlock; |
6b008426 | 199 | |
07f1c7a7 | 200 | if (!file_priv->minor->master) |
c996fd0b | 201 | goto out_unlock; |
07f1c7a7 | 202 | |
c996fd0b | 203 | ret = 0; |
862302ff TH |
204 | if (dev->driver->master_drop) |
205 | dev->driver->master_drop(dev, file_priv, false); | |
7c1c2871 | 206 | drm_master_put(&file_priv->minor->master); |
7963e9db | 207 | file_priv->is_master = 0; |
c996fd0b TH |
208 | |
209 | out_unlock: | |
210 | mutex_unlock(&dev->master_mutex); | |
211 | return ret; | |
7c1c2871 DA |
212 | } |
213 | ||
0d639883 DH |
214 | /* |
215 | * DRM Minors | |
216 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
217 | * of them is represented by a drm_minor object. Depending on the capabilities | |
218 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 219 | * |
0d639883 DH |
220 | * Minors can be accessed via dev->$minor_name. This pointer is either |
221 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
222 | * valid. This means, DRM minors have the same life-time as the underlying | |
223 | * device. However, this doesn't mean that the minor is active. Minors are | |
224 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 225 | */ |
0d639883 | 226 | |
05b701f6 DH |
227 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
228 | unsigned int type) | |
229 | { | |
230 | switch (type) { | |
231 | case DRM_MINOR_LEGACY: | |
232 | return &dev->primary; | |
233 | case DRM_MINOR_RENDER: | |
234 | return &dev->render; | |
235 | case DRM_MINOR_CONTROL: | |
236 | return &dev->control; | |
237 | default: | |
238 | return NULL; | |
239 | } | |
240 | } | |
241 | ||
242 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
243 | { | |
244 | struct drm_minor *minor; | |
f1b85962 DH |
245 | unsigned long flags; |
246 | int r; | |
05b701f6 DH |
247 | |
248 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
249 | if (!minor) | |
250 | return -ENOMEM; | |
251 | ||
252 | minor->type = type; | |
253 | minor->dev = dev; | |
05b701f6 | 254 | |
f1b85962 DH |
255 | idr_preload(GFP_KERNEL); |
256 | spin_lock_irqsave(&drm_minor_lock, flags); | |
257 | r = idr_alloc(&drm_minors_idr, | |
258 | NULL, | |
259 | 64 * type, | |
260 | 64 * (type + 1), | |
261 | GFP_NOWAIT); | |
262 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
263 | idr_preload_end(); | |
264 | ||
265 | if (r < 0) | |
266 | goto err_free; | |
267 | ||
268 | minor->index = r; | |
269 | ||
e1728075 DH |
270 | minor->kdev = drm_sysfs_minor_alloc(minor); |
271 | if (IS_ERR(minor->kdev)) { | |
272 | r = PTR_ERR(minor->kdev); | |
273 | goto err_index; | |
274 | } | |
275 | ||
05b701f6 DH |
276 | *drm_minor_get_slot(dev, type) = minor; |
277 | return 0; | |
f1b85962 | 278 | |
e1728075 DH |
279 | err_index: |
280 | spin_lock_irqsave(&drm_minor_lock, flags); | |
281 | idr_remove(&drm_minors_idr, minor->index); | |
282 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
283 | err_free: |
284 | kfree(minor); | |
285 | return r; | |
05b701f6 DH |
286 | } |
287 | ||
bd9dfa98 DH |
288 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
289 | { | |
f1b85962 DH |
290 | struct drm_minor **slot, *minor; |
291 | unsigned long flags; | |
bd9dfa98 DH |
292 | |
293 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
294 | minor = *slot; |
295 | if (!minor) | |
296 | return; | |
297 | ||
298 | drm_mode_group_destroy(&minor->mode_group); | |
e1728075 | 299 | put_device(minor->kdev); |
f1b85962 DH |
300 | |
301 | spin_lock_irqsave(&drm_minor_lock, flags); | |
302 | idr_remove(&drm_minors_idr, minor->index); | |
303 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
304 | ||
305 | kfree(minor); | |
306 | *slot = NULL; | |
bd9dfa98 DH |
307 | } |
308 | ||
afcdbc86 | 309 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 310 | { |
f1b85962 | 311 | struct drm_minor *minor; |
0d639883 | 312 | unsigned long flags; |
1da177e4 | 313 | int ret; |
1da177e4 LT |
314 | |
315 | DRM_DEBUG("\n"); | |
316 | ||
f1b85962 DH |
317 | minor = *drm_minor_get_slot(dev, type); |
318 | if (!minor) | |
05b701f6 DH |
319 | return 0; |
320 | ||
f1b85962 | 321 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 322 | if (ret) { |
156f5a78 | 323 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
f1b85962 | 324 | return ret; |
955b12de | 325 | } |
2c14f28b | 326 | |
e1728075 DH |
327 | ret = device_add(minor->kdev); |
328 | if (ret) | |
cb6458f9 | 329 | goto err_debugfs; |
2c14f28b | 330 | |
0d639883 DH |
331 | /* replace NULL with @minor so lookups will succeed from now on */ |
332 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 333 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 334 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 335 | |
f1b85962 | 336 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
337 | return 0; |
338 | ||
cb6458f9 | 339 | err_debugfs: |
f1b85962 | 340 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
341 | return ret; |
342 | } | |
b5e89ed5 | 343 | |
afcdbc86 | 344 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 345 | { |
afcdbc86 | 346 | struct drm_minor *minor; |
0d639883 | 347 | unsigned long flags; |
afcdbc86 DH |
348 | |
349 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 350 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
351 | return; |
352 | ||
f1b85962 | 353 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 354 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 355 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 356 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 357 | |
e1728075 DH |
358 | device_del(minor->kdev); |
359 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 360 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
361 | } |
362 | ||
363 | /** | |
1616c525 DH |
364 | * drm_minor_acquire - Acquire a DRM minor |
365 | * @minor_id: Minor ID of the DRM-minor | |
366 | * | |
367 | * Looks up the given minor-ID and returns the respective DRM-minor object. The | |
368 | * refence-count of the underlying device is increased so you must release this | |
369 | * object with drm_minor_release(). | |
370 | * | |
371 | * As long as you hold this minor, it is guaranteed that the object and the | |
372 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
373 | * unregistered while you hold the minor. | |
f73aca50 | 374 | * |
1616c525 DH |
375 | * Returns: |
376 | * Pointer to minor-object with increased device-refcount, or PTR_ERR on | |
377 | * failure. | |
1da177e4 | 378 | */ |
1616c525 | 379 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 380 | { |
1616c525 | 381 | struct drm_minor *minor; |
0d639883 | 382 | unsigned long flags; |
1616c525 | 383 | |
0d639883 | 384 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 385 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 DH |
386 | if (minor) |
387 | drm_dev_ref(minor->dev); | |
388 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
389 | ||
390 | if (!minor) { | |
391 | return ERR_PTR(-ENODEV); | |
392 | } else if (drm_device_is_unplugged(minor->dev)) { | |
393 | drm_dev_unref(minor->dev); | |
1616c525 | 394 | return ERR_PTR(-ENODEV); |
0d639883 | 395 | } |
673a394b | 396 | |
1616c525 DH |
397 | return minor; |
398 | } | |
b5e89ed5 | 399 | |
1616c525 DH |
400 | /** |
401 | * drm_minor_release - Release DRM minor | |
402 | * @minor: Pointer to DRM minor object | |
403 | * | |
404 | * Release a minor that was previously acquired via drm_minor_acquire(). | |
405 | */ | |
406 | void drm_minor_release(struct drm_minor *minor) | |
407 | { | |
408 | drm_dev_unref(minor->dev); | |
1da177e4 | 409 | } |
112b715e KH |
410 | |
411 | /** | |
c6a1af8a TR |
412 | * drm_put_dev - Unregister and release a DRM device |
413 | * @dev: DRM device | |
112b715e | 414 | * |
c6a1af8a | 415 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 416 | * |
c6a1af8a TR |
417 | * Use of this function is discouraged. It will eventually go away completely. |
418 | * Please use drm_dev_unregister() and drm_dev_unref() explicitly instead. | |
419 | * | |
420 | * Cleans up all DRM device, calling drm_lastclose(). | |
112b715e KH |
421 | */ |
422 | void drm_put_dev(struct drm_device *dev) | |
423 | { | |
112b715e KH |
424 | DRM_DEBUG("\n"); |
425 | ||
426 | if (!dev) { | |
427 | DRM_ERROR("cleanup called no dev\n"); | |
428 | return; | |
429 | } | |
430 | ||
c3a49737 | 431 | drm_dev_unregister(dev); |
099d1c29 | 432 | drm_dev_unref(dev); |
112b715e KH |
433 | } |
434 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
435 | |
436 | void drm_unplug_dev(struct drm_device *dev) | |
437 | { | |
438 | /* for a USB device */ | |
afcdbc86 DH |
439 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
440 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
441 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
2c07a21d DA |
442 | |
443 | mutex_lock(&drm_global_mutex); | |
444 | ||
445 | drm_device_set_unplugged(dev); | |
446 | ||
447 | if (dev->open_count == 0) { | |
448 | drm_put_dev(dev); | |
449 | } | |
450 | mutex_unlock(&drm_global_mutex); | |
451 | } | |
452 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 453 | |
31bbe16f DH |
454 | /* |
455 | * DRM internal mount | |
456 | * We want to be able to allocate our own "struct address_space" to control | |
457 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
458 | * stand-alone address_space objects, so we need an underlying inode. As there | |
459 | * is no way to allocate an independent inode easily, we need a fake internal | |
460 | * VFS mount-point. | |
461 | * | |
462 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
463 | * frees it again. You are allowed to use iget() and iput() to get references to | |
464 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
465 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
466 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
467 | * between multiple inode-users. You could, technically, call | |
468 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
469 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
470 | */ | |
471 | ||
472 | static int drm_fs_cnt; | |
473 | static struct vfsmount *drm_fs_mnt; | |
474 | ||
475 | static const struct dentry_operations drm_fs_dops = { | |
476 | .d_dname = simple_dname, | |
477 | }; | |
478 | ||
479 | static const struct super_operations drm_fs_sops = { | |
480 | .statfs = simple_statfs, | |
481 | }; | |
482 | ||
483 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
484 | const char *dev_name, void *data) | |
485 | { | |
486 | return mount_pseudo(fs_type, | |
487 | "drm:", | |
488 | &drm_fs_sops, | |
489 | &drm_fs_dops, | |
490 | 0x010203ff); | |
491 | } | |
492 | ||
493 | static struct file_system_type drm_fs_type = { | |
494 | .name = "drm", | |
495 | .owner = THIS_MODULE, | |
496 | .mount = drm_fs_mount, | |
497 | .kill_sb = kill_anon_super, | |
498 | }; | |
499 | ||
500 | static struct inode *drm_fs_inode_new(void) | |
501 | { | |
502 | struct inode *inode; | |
503 | int r; | |
504 | ||
505 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
506 | if (r < 0) { | |
507 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
508 | return ERR_PTR(r); | |
509 | } | |
510 | ||
511 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
512 | if (IS_ERR(inode)) | |
513 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
514 | ||
515 | return inode; | |
516 | } | |
517 | ||
518 | static void drm_fs_inode_free(struct inode *inode) | |
519 | { | |
520 | if (inode) { | |
521 | iput(inode); | |
522 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
523 | } | |
524 | } | |
525 | ||
1bb72532 | 526 | /** |
c6a1af8a | 527 | * drm_dev_alloc - Allocate new DRM device |
1bb72532 DH |
528 | * @driver: DRM driver to allocate device for |
529 | * @parent: Parent device object | |
530 | * | |
531 | * Allocate and initialize a new DRM device. No device registration is done. | |
c22f0ace DH |
532 | * Call drm_dev_register() to advertice the device to user space and register it |
533 | * with other core subsystems. | |
1bb72532 | 534 | * |
099d1c29 DH |
535 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
536 | * drm_dev_unref() to take and drop further ref-counts. | |
537 | * | |
b0ff4b93 DV |
538 | * Note that for purely virtual devices @parent can be NULL. |
539 | * | |
1bb72532 DH |
540 | * RETURNS: |
541 | * Pointer to new DRM device, or NULL if out of memory. | |
542 | */ | |
543 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
544 | struct device *parent) | |
545 | { | |
546 | struct drm_device *dev; | |
547 | int ret; | |
548 | ||
549 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
550 | if (!dev) | |
551 | return NULL; | |
552 | ||
099d1c29 | 553 | kref_init(&dev->ref); |
1bb72532 DH |
554 | dev->dev = parent; |
555 | dev->driver = driver; | |
556 | ||
557 | INIT_LIST_HEAD(&dev->filelist); | |
558 | INIT_LIST_HEAD(&dev->ctxlist); | |
559 | INIT_LIST_HEAD(&dev->vmalist); | |
560 | INIT_LIST_HEAD(&dev->maplist); | |
561 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
562 | ||
2177a218 | 563 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
564 | spin_lock_init(&dev->event_lock); |
565 | mutex_init(&dev->struct_mutex); | |
566 | mutex_init(&dev->ctxlist_mutex); | |
c996fd0b | 567 | mutex_init(&dev->master_mutex); |
1bb72532 | 568 | |
6796cb16 DH |
569 | dev->anon_inode = drm_fs_inode_new(); |
570 | if (IS_ERR(dev->anon_inode)) { | |
571 | ret = PTR_ERR(dev->anon_inode); | |
572 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 573 | goto err_free; |
6796cb16 DH |
574 | } |
575 | ||
05b701f6 DH |
576 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
577 | ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); | |
578 | if (ret) | |
579 | goto err_minors; | |
580 | } | |
581 | ||
6d6dfcfb | 582 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
583 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
584 | if (ret) | |
585 | goto err_minors; | |
586 | } | |
587 | ||
588 | ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY); | |
589 | if (ret) | |
590 | goto err_minors; | |
591 | ||
6796cb16 | 592 | if (drm_ht_create(&dev->map_hash, 12)) |
05b701f6 | 593 | goto err_minors; |
1bb72532 | 594 | |
e7b96070 | 595 | ret = drm_legacy_ctxbitmap_init(dev); |
1bb72532 DH |
596 | if (ret) { |
597 | DRM_ERROR("Cannot allocate memory for context bitmap.\n"); | |
598 | goto err_ht; | |
599 | } | |
600 | ||
1bcecfac | 601 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
602 | ret = drm_gem_init(dev); |
603 | if (ret) { | |
604 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
605 | goto err_ctxbitmap; | |
606 | } | |
607 | } | |
608 | ||
609 | return dev; | |
610 | ||
611 | err_ctxbitmap: | |
e7b96070 | 612 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 DH |
613 | err_ht: |
614 | drm_ht_remove(&dev->map_hash); | |
05b701f6 | 615 | err_minors: |
bd9dfa98 DH |
616 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
617 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
618 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 619 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 620 | err_free: |
c996fd0b | 621 | mutex_destroy(&dev->master_mutex); |
1bb72532 DH |
622 | kfree(dev); |
623 | return NULL; | |
624 | } | |
625 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 626 | |
099d1c29 | 627 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 628 | { |
099d1c29 | 629 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 630 | |
1bcecfac | 631 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
0dc8fe59 DH |
632 | drm_gem_destroy(dev); |
633 | ||
e7b96070 | 634 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 635 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 636 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 637 | |
bd9dfa98 DH |
638 | drm_minor_free(dev, DRM_MINOR_LEGACY); |
639 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
640 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
641 | ||
c996fd0b | 642 | mutex_destroy(&dev->master_mutex); |
ca8e2ad7 | 643 | kfree(dev->unique); |
0dc8fe59 DH |
644 | kfree(dev); |
645 | } | |
099d1c29 DH |
646 | |
647 | /** | |
648 | * drm_dev_ref - Take reference of a DRM device | |
649 | * @dev: device to take reference of or NULL | |
650 | * | |
651 | * This increases the ref-count of @dev by one. You *must* already own a | |
652 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
653 | * again. | |
654 | * | |
655 | * This function never fails. However, this function does not provide *any* | |
656 | * guarantee whether the device is alive or running. It only provides a | |
657 | * reference to the object and the memory associated with it. | |
658 | */ | |
659 | void drm_dev_ref(struct drm_device *dev) | |
660 | { | |
661 | if (dev) | |
662 | kref_get(&dev->ref); | |
663 | } | |
664 | EXPORT_SYMBOL(drm_dev_ref); | |
665 | ||
666 | /** | |
667 | * drm_dev_unref - Drop reference of a DRM device | |
668 | * @dev: device to drop reference of or NULL | |
669 | * | |
670 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
671 | * ref-count drops to zero. | |
672 | */ | |
673 | void drm_dev_unref(struct drm_device *dev) | |
674 | { | |
675 | if (dev) | |
676 | kref_put(&dev->ref, drm_dev_release); | |
677 | } | |
678 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 679 | |
c22f0ace DH |
680 | /** |
681 | * drm_dev_register - Register DRM device | |
682 | * @dev: Device to register | |
c6a1af8a | 683 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
684 | * |
685 | * Register the DRM device @dev with the system, advertise device to user-space | |
686 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
687 | * previously. | |
688 | * | |
689 | * Never call this twice on any device! | |
690 | * | |
691 | * RETURNS: | |
692 | * 0 on success, negative error code on failure. | |
693 | */ | |
694 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
695 | { | |
696 | int ret; | |
697 | ||
698 | mutex_lock(&drm_global_mutex); | |
699 | ||
afcdbc86 | 700 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
701 | if (ret) |
702 | goto err_minors; | |
c22f0ace | 703 | |
afcdbc86 | 704 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
705 | if (ret) |
706 | goto err_minors; | |
c22f0ace | 707 | |
afcdbc86 | 708 | ret = drm_minor_register(dev, DRM_MINOR_LEGACY); |
c22f0ace | 709 | if (ret) |
05b701f6 | 710 | goto err_minors; |
c22f0ace DH |
711 | |
712 | if (dev->driver->load) { | |
713 | ret = dev->driver->load(dev, flags); | |
714 | if (ret) | |
05b701f6 | 715 | goto err_minors; |
c22f0ace DH |
716 | } |
717 | ||
718 | /* setup grouping for legacy outputs */ | |
719 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
720 | ret = drm_mode_group_init_legacy_group(dev, | |
721 | &dev->primary->mode_group); | |
722 | if (ret) | |
723 | goto err_unload; | |
724 | } | |
725 | ||
c22f0ace DH |
726 | ret = 0; |
727 | goto out_unlock; | |
728 | ||
729 | err_unload: | |
730 | if (dev->driver->unload) | |
731 | dev->driver->unload(dev); | |
05b701f6 | 732 | err_minors: |
afcdbc86 DH |
733 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
734 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
735 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
736 | out_unlock: |
737 | mutex_unlock(&drm_global_mutex); | |
738 | return ret; | |
739 | } | |
740 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
741 | |
742 | /** | |
743 | * drm_dev_unregister - Unregister DRM device | |
744 | * @dev: Device to unregister | |
745 | * | |
746 | * Unregister the DRM device from the system. This does the reverse of | |
747 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 748 | * drm_dev_unref() to drop their final reference. |
c3a49737 DH |
749 | */ |
750 | void drm_dev_unregister(struct drm_device *dev) | |
751 | { | |
752 | struct drm_map_list *r_list, *list_temp; | |
753 | ||
754 | drm_lastclose(dev); | |
755 | ||
756 | if (dev->driver->unload) | |
757 | dev->driver->unload(dev); | |
758 | ||
4efafebe DV |
759 | if (dev->agp) |
760 | drm_pci_agp_destroy(dev); | |
c3a49737 DH |
761 | |
762 | drm_vblank_cleanup(dev); | |
763 | ||
764 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) | |
9fc5cde7 | 765 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 766 | |
afcdbc86 DH |
767 | drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
768 | drm_minor_unregister(dev, DRM_MINOR_RENDER); | |
769 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
770 | } |
771 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 TR |
772 | |
773 | /** | |
774 | * drm_dev_set_unique - Set the unique name of a DRM device | |
775 | * @dev: device of which to set the unique name | |
776 | * @fmt: format string for unique name | |
777 | * | |
778 | * Sets the unique name of a DRM device using the specified format string and | |
779 | * a variable list of arguments. Drivers can use this at driver probe time if | |
780 | * the unique name of the devices they drive is static. | |
781 | * | |
782 | * Return: 0 on success or a negative error code on failure. | |
783 | */ | |
784 | int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...) | |
785 | { | |
786 | va_list ap; | |
787 | ||
788 | kfree(dev->unique); | |
789 | ||
790 | va_start(ap, fmt); | |
791 | dev->unique = kvasprintf(GFP_KERNEL, fmt, ap); | |
792 | va_end(ap); | |
793 | ||
794 | return dev->unique ? 0 : -ENOMEM; | |
795 | } | |
796 | EXPORT_SYMBOL(drm_dev_set_unique); | |
1b7199fe DH |
797 | |
798 | /* | |
799 | * DRM Core | |
800 | * The DRM core module initializes all global DRM objects and makes them | |
801 | * available to drivers. Once setup, drivers can probe their respective | |
802 | * devices. | |
803 | * Currently, core management includes: | |
804 | * - The "DRM-Global" key/value database | |
805 | * - Global ID management for connectors | |
806 | * - DRM major number allocation | |
807 | * - DRM minor management | |
808 | * - DRM sysfs class | |
809 | * - DRM debugfs root | |
810 | * | |
811 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
812 | * interface registered on a DRM device, you can request minor numbers from DRM | |
813 | * core. DRM core takes care of major-number management and char-dev | |
814 | * registration. A stub ->open() callback forwards any open() requests to the | |
815 | * registered minor. | |
816 | */ | |
817 | ||
818 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
819 | { | |
820 | const struct file_operations *new_fops; | |
821 | struct drm_minor *minor; | |
822 | int err; | |
823 | ||
824 | DRM_DEBUG("\n"); | |
825 | ||
826 | mutex_lock(&drm_global_mutex); | |
827 | minor = drm_minor_acquire(iminor(inode)); | |
828 | if (IS_ERR(minor)) { | |
829 | err = PTR_ERR(minor); | |
830 | goto out_unlock; | |
831 | } | |
832 | ||
833 | new_fops = fops_get(minor->dev->driver->fops); | |
834 | if (!new_fops) { | |
835 | err = -ENODEV; | |
836 | goto out_release; | |
837 | } | |
838 | ||
839 | replace_fops(filp, new_fops); | |
840 | if (filp->f_op->open) | |
841 | err = filp->f_op->open(inode, filp); | |
842 | else | |
843 | err = 0; | |
844 | ||
845 | out_release: | |
846 | drm_minor_release(minor); | |
847 | out_unlock: | |
848 | mutex_unlock(&drm_global_mutex); | |
849 | return err; | |
850 | } | |
851 | ||
852 | static const struct file_operations drm_stub_fops = { | |
853 | .owner = THIS_MODULE, | |
854 | .open = drm_stub_open, | |
855 | .llseek = noop_llseek, | |
856 | }; | |
857 | ||
858 | static int __init drm_core_init(void) | |
859 | { | |
860 | int ret = -ENOMEM; | |
861 | ||
862 | drm_global_init(); | |
863 | drm_connector_ida_init(); | |
864 | idr_init(&drm_minors_idr); | |
865 | ||
866 | if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) | |
867 | goto err_p1; | |
868 | ||
869 | drm_class = drm_sysfs_create(THIS_MODULE, "drm"); | |
870 | if (IS_ERR(drm_class)) { | |
871 | printk(KERN_ERR "DRM: Error creating drm class.\n"); | |
872 | ret = PTR_ERR(drm_class); | |
873 | goto err_p2; | |
874 | } | |
875 | ||
876 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
877 | if (!drm_debugfs_root) { | |
878 | DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); | |
879 | ret = -1; | |
880 | goto err_p3; | |
881 | } | |
882 | ||
883 | DRM_INFO("Initialized %s %d.%d.%d %s\n", | |
884 | CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); | |
885 | return 0; | |
886 | err_p3: | |
887 | drm_sysfs_destroy(); | |
888 | err_p2: | |
889 | unregister_chrdev(DRM_MAJOR, "drm"); | |
890 | ||
891 | idr_destroy(&drm_minors_idr); | |
892 | err_p1: | |
893 | return ret; | |
894 | } | |
895 | ||
896 | static void __exit drm_core_exit(void) | |
897 | { | |
898 | debugfs_remove(drm_debugfs_root); | |
899 | drm_sysfs_destroy(); | |
900 | ||
901 | unregister_chrdev(DRM_MAJOR, "drm"); | |
902 | ||
903 | drm_connector_ida_destroy(); | |
904 | idr_destroy(&drm_minors_idr); | |
905 | } | |
906 | ||
907 | module_init(drm_core_init); | |
908 | module_exit(drm_core_exit); |