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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 | 35 | #include <drm/drmP.h> |
79190ea2 | 36 | #include "drm_crtc_internal.h" |
e7b96070 | 37 | #include "drm_legacy.h" |
67d0ec4e | 38 | #include "drm_internal.h" |
81065548 | 39 | #include "drm_crtc_internal.h" |
1da177e4 | 40 | |
6dc3e22e EG |
41 | /* |
42 | * drm_debug: Enable debug output. | |
43 | * Bitmask of DRM_UT_x. See include/drm/drmP.h for details. | |
44 | */ | |
45 | unsigned int drm_debug = 0; | |
1da177e4 LT |
46 | EXPORT_SYMBOL(drm_debug); |
47 | ||
82d5e73f DH |
48 | MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
49 | MODULE_DESCRIPTION("DRM shared core routines"); | |
1da177e4 | 50 | MODULE_LICENSE("GPL and additional rights"); |
6dc3e22e EG |
51 | MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n" |
52 | "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n" | |
53 | "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n" | |
54 | "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n" | |
55 | "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n" | |
56 | "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n" | |
57 | "\t\tBit 5 (0x20) will enable VBL messages (vblank code)"); | |
c0758146 | 58 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 59 | |
0d639883 | 60 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 61 | static struct idr drm_minors_idr; |
2c14f28b | 62 | |
1b7199fe | 63 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 64 | |
c4e68a58 SP |
65 | #define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV" |
66 | ||
67 | void drm_dev_printk(const struct device *dev, const char *level, | |
68 | unsigned int category, const char *function_name, | |
69 | const char *prefix, const char *format, ...) | |
5ad3d883 JP |
70 | { |
71 | struct va_format vaf; | |
72 | va_list args; | |
5ad3d883 | 73 | |
c4e68a58 SP |
74 | if (category != DRM_UT_NONE && !(drm_debug & category)) |
75 | return; | |
5ad3d883 | 76 | |
c4e68a58 | 77 | va_start(args, format); |
5ad3d883 JP |
78 | vaf.fmt = format; |
79 | vaf.va = &args; | |
80 | ||
b4ba97e7 CW |
81 | if (dev) |
82 | dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix, | |
83 | &vaf); | |
84 | else | |
85 | printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf); | |
5ad3d883 JP |
86 | |
87 | va_end(args); | |
5ad3d883 | 88 | } |
c4e68a58 | 89 | EXPORT_SYMBOL(drm_dev_printk); |
5ad3d883 | 90 | |
c4e68a58 SP |
91 | void drm_printk(const char *level, unsigned int category, |
92 | const char *function_name, const char *prefix, | |
93 | const char *format, ...) | |
4fefcb27 | 94 | { |
fffb9065 | 95 | struct va_format vaf; |
4fefcb27 | 96 | va_list args; |
1da177e4 | 97 | |
c4e68a58 SP |
98 | if (category != DRM_UT_NONE && !(drm_debug & category)) |
99 | return; | |
100 | ||
a73d4e91 LD |
101 | va_start(args, format); |
102 | vaf.fmt = format; | |
103 | vaf.va = &args; | |
104 | ||
c4e68a58 | 105 | printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf); |
a73d4e91 LD |
106 | |
107 | va_end(args); | |
4fefcb27 | 108 | } |
c4e68a58 | 109 | EXPORT_SYMBOL(drm_printk); |
5ad3d883 | 110 | |
0d639883 DH |
111 | /* |
112 | * DRM Minors | |
113 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
114 | * of them is represented by a drm_minor object. Depending on the capabilities | |
115 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 116 | * |
0d639883 DH |
117 | * Minors can be accessed via dev->$minor_name. This pointer is either |
118 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
119 | * valid. This means, DRM minors have the same life-time as the underlying | |
120 | * device. However, this doesn't mean that the minor is active. Minors are | |
121 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 122 | */ |
0d639883 | 123 | |
05b701f6 DH |
124 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
125 | unsigned int type) | |
126 | { | |
127 | switch (type) { | |
a3ccc461 | 128 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
129 | return &dev->primary; |
130 | case DRM_MINOR_RENDER: | |
131 | return &dev->render; | |
132 | case DRM_MINOR_CONTROL: | |
133 | return &dev->control; | |
134 | default: | |
135 | return NULL; | |
136 | } | |
137 | } | |
138 | ||
139 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
140 | { | |
141 | struct drm_minor *minor; | |
f1b85962 DH |
142 | unsigned long flags; |
143 | int r; | |
05b701f6 DH |
144 | |
145 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
146 | if (!minor) | |
147 | return -ENOMEM; | |
148 | ||
149 | minor->type = type; | |
150 | minor->dev = dev; | |
05b701f6 | 151 | |
f1b85962 DH |
152 | idr_preload(GFP_KERNEL); |
153 | spin_lock_irqsave(&drm_minor_lock, flags); | |
154 | r = idr_alloc(&drm_minors_idr, | |
155 | NULL, | |
156 | 64 * type, | |
157 | 64 * (type + 1), | |
158 | GFP_NOWAIT); | |
159 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
160 | idr_preload_end(); | |
161 | ||
162 | if (r < 0) | |
163 | goto err_free; | |
164 | ||
165 | minor->index = r; | |
166 | ||
e1728075 DH |
167 | minor->kdev = drm_sysfs_minor_alloc(minor); |
168 | if (IS_ERR(minor->kdev)) { | |
169 | r = PTR_ERR(minor->kdev); | |
170 | goto err_index; | |
171 | } | |
172 | ||
05b701f6 DH |
173 | *drm_minor_get_slot(dev, type) = minor; |
174 | return 0; | |
f1b85962 | 175 | |
e1728075 DH |
176 | err_index: |
177 | spin_lock_irqsave(&drm_minor_lock, flags); | |
178 | idr_remove(&drm_minors_idr, minor->index); | |
179 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
180 | err_free: |
181 | kfree(minor); | |
182 | return r; | |
05b701f6 DH |
183 | } |
184 | ||
bd9dfa98 DH |
185 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
186 | { | |
f1b85962 DH |
187 | struct drm_minor **slot, *minor; |
188 | unsigned long flags; | |
bd9dfa98 DH |
189 | |
190 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
191 | minor = *slot; |
192 | if (!minor) | |
193 | return; | |
194 | ||
e1728075 | 195 | put_device(minor->kdev); |
f1b85962 DH |
196 | |
197 | spin_lock_irqsave(&drm_minor_lock, flags); | |
198 | idr_remove(&drm_minors_idr, minor->index); | |
199 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
200 | ||
201 | kfree(minor); | |
202 | *slot = NULL; | |
bd9dfa98 DH |
203 | } |
204 | ||
afcdbc86 | 205 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 206 | { |
f1b85962 | 207 | struct drm_minor *minor; |
0d639883 | 208 | unsigned long flags; |
1da177e4 | 209 | int ret; |
1da177e4 LT |
210 | |
211 | DRM_DEBUG("\n"); | |
212 | ||
f1b85962 DH |
213 | minor = *drm_minor_get_slot(dev, type); |
214 | if (!minor) | |
05b701f6 DH |
215 | return 0; |
216 | ||
f1b85962 | 217 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 218 | if (ret) { |
156f5a78 | 219 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
f1b85962 | 220 | return ret; |
955b12de | 221 | } |
2c14f28b | 222 | |
e1728075 DH |
223 | ret = device_add(minor->kdev); |
224 | if (ret) | |
cb6458f9 | 225 | goto err_debugfs; |
2c14f28b | 226 | |
0d639883 DH |
227 | /* replace NULL with @minor so lookups will succeed from now on */ |
228 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 229 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 230 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 231 | |
f1b85962 | 232 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
233 | return 0; |
234 | ||
cb6458f9 | 235 | err_debugfs: |
f1b85962 | 236 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
237 | return ret; |
238 | } | |
b5e89ed5 | 239 | |
afcdbc86 | 240 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 241 | { |
afcdbc86 | 242 | struct drm_minor *minor; |
0d639883 | 243 | unsigned long flags; |
afcdbc86 DH |
244 | |
245 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 246 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
247 | return; |
248 | ||
f1b85962 | 249 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 250 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 251 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 252 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 253 | |
e1728075 DH |
254 | device_del(minor->kdev); |
255 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 256 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
257 | } |
258 | ||
259 | /** | |
1616c525 DH |
260 | * drm_minor_acquire - Acquire a DRM minor |
261 | * @minor_id: Minor ID of the DRM-minor | |
262 | * | |
263 | * Looks up the given minor-ID and returns the respective DRM-minor object. The | |
264 | * refence-count of the underlying device is increased so you must release this | |
265 | * object with drm_minor_release(). | |
266 | * | |
267 | * As long as you hold this minor, it is guaranteed that the object and the | |
268 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
269 | * unregistered while you hold the minor. | |
f73aca50 | 270 | * |
1616c525 DH |
271 | * Returns: |
272 | * Pointer to minor-object with increased device-refcount, or PTR_ERR on | |
273 | * failure. | |
1da177e4 | 274 | */ |
1616c525 | 275 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 276 | { |
1616c525 | 277 | struct drm_minor *minor; |
0d639883 | 278 | unsigned long flags; |
1616c525 | 279 | |
0d639883 | 280 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 281 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 DH |
282 | if (minor) |
283 | drm_dev_ref(minor->dev); | |
284 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
285 | ||
286 | if (!minor) { | |
287 | return ERR_PTR(-ENODEV); | |
288 | } else if (drm_device_is_unplugged(minor->dev)) { | |
289 | drm_dev_unref(minor->dev); | |
1616c525 | 290 | return ERR_PTR(-ENODEV); |
0d639883 | 291 | } |
673a394b | 292 | |
1616c525 DH |
293 | return minor; |
294 | } | |
b5e89ed5 | 295 | |
1616c525 DH |
296 | /** |
297 | * drm_minor_release - Release DRM minor | |
298 | * @minor: Pointer to DRM minor object | |
299 | * | |
300 | * Release a minor that was previously acquired via drm_minor_acquire(). | |
301 | */ | |
302 | void drm_minor_release(struct drm_minor *minor) | |
303 | { | |
304 | drm_dev_unref(minor->dev); | |
1da177e4 | 305 | } |
112b715e | 306 | |
6e3f797c DV |
307 | /** |
308 | * DOC: driver instance overview | |
309 | * | |
310 | * A device instance for a drm driver is represented by struct &drm_device. This | |
311 | * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() | |
312 | * callbacks implemented by the driver. The driver then needs to initialize all | |
313 | * the various subsystems for the drm device like memory management, vblank | |
314 | * handling, modesetting support and intial output configuration plus obviously | |
a742946a DV |
315 | * initialize all the corresponding hardware bits. Finally when everything is up |
316 | * and running and ready for userspace the device instance can be published | |
317 | * using drm_dev_register(). | |
6e3f797c DV |
318 | * |
319 | * There is also deprecated support for initalizing device instances using | |
320 | * bus-specific helpers and the ->load() callback. But due to | |
321 | * backwards-compatibility needs the device instance have to be published too | |
322 | * early, which requires unpretty global locking to make safe and is therefore | |
323 | * only support for existing drivers not yet converted to the new scheme. | |
324 | * | |
325 | * When cleaning up a device instance everything needs to be done in reverse: | |
326 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
327 | * any other resources allocated at device initialization and drop the driver's | |
328 | * reference to &drm_device using drm_dev_unref(). | |
329 | * | |
330 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
331 | * historical baggage. Hence use the reference counting provided by | |
332 | * drm_dev_ref() and drm_dev_unref() only carefully. | |
333 | * | |
334 | * Also note that embedding of &drm_device is currently not (yet) supported (but | |
335 | * it would be easy to add). Drivers can store driver-private data in the | |
336 | * dev_priv field of &drm_device. | |
337 | */ | |
338 | ||
a742946a DV |
339 | static int drm_dev_set_unique(struct drm_device *dev, const char *name) |
340 | { | |
341 | kfree(dev->unique); | |
342 | dev->unique = kstrdup(name, GFP_KERNEL); | |
343 | ||
344 | return dev->unique ? 0 : -ENOMEM; | |
345 | } | |
346 | ||
112b715e | 347 | /** |
c6a1af8a TR |
348 | * drm_put_dev - Unregister and release a DRM device |
349 | * @dev: DRM device | |
112b715e | 350 | * |
c6a1af8a | 351 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 352 | * |
c6a1af8a | 353 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
354 | * |
355 | * Note: Use of this function is deprecated. It will eventually go away | |
356 | * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly | |
357 | * instead to make sure that the device isn't userspace accessible any more | |
358 | * while teardown is in progress, ensuring that userspace can't access an | |
359 | * inconsistent state. | |
112b715e KH |
360 | */ |
361 | void drm_put_dev(struct drm_device *dev) | |
362 | { | |
112b715e KH |
363 | DRM_DEBUG("\n"); |
364 | ||
365 | if (!dev) { | |
366 | DRM_ERROR("cleanup called no dev\n"); | |
367 | return; | |
368 | } | |
369 | ||
c3a49737 | 370 | drm_dev_unregister(dev); |
099d1c29 | 371 | drm_dev_unref(dev); |
112b715e KH |
372 | } |
373 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
374 | |
375 | void drm_unplug_dev(struct drm_device *dev) | |
376 | { | |
377 | /* for a USB device */ | |
a39be606 | 378 | drm_dev_unregister(dev); |
2c07a21d DA |
379 | |
380 | mutex_lock(&drm_global_mutex); | |
381 | ||
382 | drm_device_set_unplugged(dev); | |
383 | ||
384 | if (dev->open_count == 0) { | |
385 | drm_put_dev(dev); | |
386 | } | |
387 | mutex_unlock(&drm_global_mutex); | |
388 | } | |
389 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 390 | |
31bbe16f DH |
391 | /* |
392 | * DRM internal mount | |
393 | * We want to be able to allocate our own "struct address_space" to control | |
394 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
395 | * stand-alone address_space objects, so we need an underlying inode. As there | |
396 | * is no way to allocate an independent inode easily, we need a fake internal | |
397 | * VFS mount-point. | |
398 | * | |
399 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
400 | * frees it again. You are allowed to use iget() and iput() to get references to | |
401 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
402 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
403 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
404 | * between multiple inode-users. You could, technically, call | |
405 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
406 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
407 | */ | |
408 | ||
409 | static int drm_fs_cnt; | |
410 | static struct vfsmount *drm_fs_mnt; | |
411 | ||
412 | static const struct dentry_operations drm_fs_dops = { | |
413 | .d_dname = simple_dname, | |
414 | }; | |
415 | ||
416 | static const struct super_operations drm_fs_sops = { | |
417 | .statfs = simple_statfs, | |
418 | }; | |
419 | ||
420 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
421 | const char *dev_name, void *data) | |
422 | { | |
423 | return mount_pseudo(fs_type, | |
424 | "drm:", | |
425 | &drm_fs_sops, | |
426 | &drm_fs_dops, | |
427 | 0x010203ff); | |
428 | } | |
429 | ||
430 | static struct file_system_type drm_fs_type = { | |
431 | .name = "drm", | |
432 | .owner = THIS_MODULE, | |
433 | .mount = drm_fs_mount, | |
434 | .kill_sb = kill_anon_super, | |
435 | }; | |
436 | ||
437 | static struct inode *drm_fs_inode_new(void) | |
438 | { | |
439 | struct inode *inode; | |
440 | int r; | |
441 | ||
442 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
443 | if (r < 0) { | |
444 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
445 | return ERR_PTR(r); | |
446 | } | |
447 | ||
448 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
449 | if (IS_ERR(inode)) | |
450 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
451 | ||
452 | return inode; | |
453 | } | |
454 | ||
455 | static void drm_fs_inode_free(struct inode *inode) | |
456 | { | |
457 | if (inode) { | |
458 | iput(inode); | |
459 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
460 | } | |
461 | } | |
462 | ||
1bb72532 | 463 | /** |
b209aca3 CW |
464 | * drm_dev_init - Initialise new DRM device |
465 | * @dev: DRM device | |
466 | * @driver: DRM driver | |
1bb72532 DH |
467 | * @parent: Parent device object |
468 | * | |
b209aca3 | 469 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 470 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
471 | * with other core subsystems. This should be done last in the device |
472 | * initialization sequence to make sure userspace can't access an inconsistent | |
473 | * state. | |
1bb72532 | 474 | * |
099d1c29 DH |
475 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
476 | * drm_dev_unref() to take and drop further ref-counts. | |
477 | * | |
b0ff4b93 DV |
478 | * Note that for purely virtual devices @parent can be NULL. |
479 | * | |
b209aca3 CW |
480 | * Drivers that do not want to allocate their own device struct |
481 | * embedding struct &drm_device can call drm_dev_alloc() instead. | |
482 | * | |
1bb72532 | 483 | * RETURNS: |
b209aca3 | 484 | * 0 on success, or error code on failure. |
1bb72532 | 485 | */ |
b209aca3 CW |
486 | int drm_dev_init(struct drm_device *dev, |
487 | struct drm_driver *driver, | |
488 | struct device *parent) | |
1bb72532 | 489 | { |
1bb72532 DH |
490 | int ret; |
491 | ||
099d1c29 | 492 | kref_init(&dev->ref); |
1bb72532 DH |
493 | dev->dev = parent; |
494 | dev->driver = driver; | |
495 | ||
496 | INIT_LIST_HEAD(&dev->filelist); | |
497 | INIT_LIST_HEAD(&dev->ctxlist); | |
498 | INIT_LIST_HEAD(&dev->vmalist); | |
499 | INIT_LIST_HEAD(&dev->maplist); | |
500 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
501 | ||
2177a218 | 502 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
503 | spin_lock_init(&dev->event_lock); |
504 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 505 | mutex_init(&dev->filelist_mutex); |
1bb72532 | 506 | mutex_init(&dev->ctxlist_mutex); |
c996fd0b | 507 | mutex_init(&dev->master_mutex); |
1bb72532 | 508 | |
6796cb16 DH |
509 | dev->anon_inode = drm_fs_inode_new(); |
510 | if (IS_ERR(dev->anon_inode)) { | |
511 | ret = PTR_ERR(dev->anon_inode); | |
512 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 513 | goto err_free; |
6796cb16 DH |
514 | } |
515 | ||
05b701f6 DH |
516 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
517 | ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); | |
518 | if (ret) | |
519 | goto err_minors; | |
520 | } | |
521 | ||
6d6dfcfb | 522 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
523 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
524 | if (ret) | |
525 | goto err_minors; | |
526 | } | |
527 | ||
a3ccc461 | 528 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 DH |
529 | if (ret) |
530 | goto err_minors; | |
531 | ||
b209aca3 CW |
532 | ret = drm_ht_create(&dev->map_hash, 12); |
533 | if (ret) | |
05b701f6 | 534 | goto err_minors; |
1bb72532 | 535 | |
ba6976c1 | 536 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 537 | |
1bcecfac | 538 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
539 | ret = drm_gem_init(dev); |
540 | if (ret) { | |
541 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
542 | goto err_ctxbitmap; | |
543 | } | |
544 | } | |
545 | ||
5079c464 DV |
546 | /* Use the parent device name as DRM device unique identifier, but fall |
547 | * back to the driver name for virtual devices like vgem. */ | |
548 | ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name); | |
549 | if (ret) | |
550 | goto err_setunique; | |
e112e593 | 551 | |
b209aca3 | 552 | return 0; |
1bb72532 | 553 | |
e112e593 NI |
554 | err_setunique: |
555 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
556 | drm_gem_destroy(dev); | |
1bb72532 | 557 | err_ctxbitmap: |
e7b96070 | 558 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 559 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 560 | err_minors: |
a3ccc461 | 561 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 DH |
562 | drm_minor_free(dev, DRM_MINOR_RENDER); |
563 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 564 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 565 | err_free: |
c996fd0b | 566 | mutex_destroy(&dev->master_mutex); |
b209aca3 CW |
567 | return ret; |
568 | } | |
569 | EXPORT_SYMBOL(drm_dev_init); | |
570 | ||
571 | /** | |
572 | * drm_dev_alloc - Allocate new DRM device | |
573 | * @driver: DRM driver to allocate device for | |
574 | * @parent: Parent device object | |
575 | * | |
576 | * Allocate and initialize a new DRM device. No device registration is done. | |
577 | * Call drm_dev_register() to advertice the device to user space and register it | |
578 | * with other core subsystems. This should be done last in the device | |
579 | * initialization sequence to make sure userspace can't access an inconsistent | |
580 | * state. | |
581 | * | |
582 | * The initial ref-count of the object is 1. Use drm_dev_ref() and | |
583 | * drm_dev_unref() to take and drop further ref-counts. | |
584 | * | |
585 | * Note that for purely virtual devices @parent can be NULL. | |
586 | * | |
587 | * Drivers that wish to subclass or embed struct &drm_device into their | |
588 | * own struct should look at using drm_dev_init() instead. | |
589 | * | |
590 | * RETURNS: | |
591 | * Pointer to new DRM device, or NULL if out of memory. | |
592 | */ | |
593 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
594 | struct device *parent) | |
595 | { | |
596 | struct drm_device *dev; | |
597 | int ret; | |
598 | ||
599 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
600 | if (!dev) | |
601 | return NULL; | |
602 | ||
603 | ret = drm_dev_init(dev, driver, parent); | |
604 | if (ret) { | |
605 | kfree(dev); | |
606 | return NULL; | |
607 | } | |
608 | ||
609 | return dev; | |
1bb72532 DH |
610 | } |
611 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 612 | |
099d1c29 | 613 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 614 | { |
099d1c29 | 615 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 616 | |
1bcecfac | 617 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
0dc8fe59 DH |
618 | drm_gem_destroy(dev); |
619 | ||
e7b96070 | 620 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 621 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 622 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 623 | |
a3ccc461 | 624 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 DH |
625 | drm_minor_free(dev, DRM_MINOR_RENDER); |
626 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
627 | ||
c996fd0b | 628 | mutex_destroy(&dev->master_mutex); |
ca8e2ad7 | 629 | kfree(dev->unique); |
0dc8fe59 DH |
630 | kfree(dev); |
631 | } | |
099d1c29 DH |
632 | |
633 | /** | |
634 | * drm_dev_ref - Take reference of a DRM device | |
635 | * @dev: device to take reference of or NULL | |
636 | * | |
637 | * This increases the ref-count of @dev by one. You *must* already own a | |
638 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
639 | * again. | |
640 | * | |
641 | * This function never fails. However, this function does not provide *any* | |
642 | * guarantee whether the device is alive or running. It only provides a | |
643 | * reference to the object and the memory associated with it. | |
644 | */ | |
645 | void drm_dev_ref(struct drm_device *dev) | |
646 | { | |
647 | if (dev) | |
648 | kref_get(&dev->ref); | |
649 | } | |
650 | EXPORT_SYMBOL(drm_dev_ref); | |
651 | ||
652 | /** | |
653 | * drm_dev_unref - Drop reference of a DRM device | |
654 | * @dev: device to drop reference of or NULL | |
655 | * | |
656 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
657 | * ref-count drops to zero. | |
658 | */ | |
659 | void drm_dev_unref(struct drm_device *dev) | |
660 | { | |
661 | if (dev) | |
662 | kref_put(&dev->ref, drm_dev_release); | |
663 | } | |
664 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 665 | |
c22f0ace DH |
666 | /** |
667 | * drm_dev_register - Register DRM device | |
668 | * @dev: Device to register | |
c6a1af8a | 669 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
670 | * |
671 | * Register the DRM device @dev with the system, advertise device to user-space | |
672 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
e28cd4d0 | 673 | * previously. |
c22f0ace DH |
674 | * |
675 | * Never call this twice on any device! | |
676 | * | |
6e3f797c DV |
677 | * NOTE: To ensure backward compatibility with existing drivers method this |
678 | * function calls the ->load() method after registering the device nodes, | |
679 | * creating race conditions. Usage of the ->load() methods is therefore | |
680 | * deprecated, drivers must perform all initialization before calling | |
681 | * drm_dev_register(). | |
682 | * | |
c22f0ace DH |
683 | * RETURNS: |
684 | * 0 on success, negative error code on failure. | |
685 | */ | |
686 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
687 | { | |
688 | int ret; | |
689 | ||
690 | mutex_lock(&drm_global_mutex); | |
691 | ||
afcdbc86 | 692 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
693 | if (ret) |
694 | goto err_minors; | |
c22f0ace | 695 | |
afcdbc86 | 696 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
697 | if (ret) |
698 | goto err_minors; | |
c22f0ace | 699 | |
a3ccc461 | 700 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 701 | if (ret) |
05b701f6 | 702 | goto err_minors; |
c22f0ace DH |
703 | |
704 | if (dev->driver->load) { | |
705 | ret = dev->driver->load(dev, flags); | |
706 | if (ret) | |
05b701f6 | 707 | goto err_minors; |
c22f0ace DH |
708 | } |
709 | ||
bee7fb15 | 710 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 711 | drm_modeset_register_all(dev); |
e28cd4d0 | 712 | |
c22f0ace DH |
713 | ret = 0; |
714 | goto out_unlock; | |
715 | ||
05b701f6 | 716 | err_minors: |
a3ccc461 | 717 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 DH |
718 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
719 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
720 | out_unlock: |
721 | mutex_unlock(&drm_global_mutex); | |
722 | return ret; | |
723 | } | |
724 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
725 | |
726 | /** | |
727 | * drm_dev_unregister - Unregister DRM device | |
728 | * @dev: Device to unregister | |
729 | * | |
730 | * Unregister the DRM device from the system. This does the reverse of | |
731 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 732 | * drm_dev_unref() to drop their final reference. |
6e3f797c DV |
733 | * |
734 | * This should be called first in the device teardown code to make sure | |
735 | * userspace can't access the device instance any more. | |
c3a49737 DH |
736 | */ |
737 | void drm_dev_unregister(struct drm_device *dev) | |
738 | { | |
739 | struct drm_map_list *r_list, *list_temp; | |
740 | ||
741 | drm_lastclose(dev); | |
742 | ||
bee7fb15 | 743 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 744 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 745 | |
c3a49737 DH |
746 | if (dev->driver->unload) |
747 | dev->driver->unload(dev); | |
748 | ||
4efafebe DV |
749 | if (dev->agp) |
750 | drm_pci_agp_destroy(dev); | |
c3a49737 DH |
751 | |
752 | drm_vblank_cleanup(dev); | |
753 | ||
754 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) | |
9fc5cde7 | 755 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 756 | |
a3ccc461 | 757 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 DH |
758 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
759 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
760 | } |
761 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 762 | |
1b7199fe DH |
763 | /* |
764 | * DRM Core | |
765 | * The DRM core module initializes all global DRM objects and makes them | |
766 | * available to drivers. Once setup, drivers can probe their respective | |
767 | * devices. | |
768 | * Currently, core management includes: | |
769 | * - The "DRM-Global" key/value database | |
770 | * - Global ID management for connectors | |
771 | * - DRM major number allocation | |
772 | * - DRM minor management | |
773 | * - DRM sysfs class | |
774 | * - DRM debugfs root | |
775 | * | |
776 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
777 | * interface registered on a DRM device, you can request minor numbers from DRM | |
778 | * core. DRM core takes care of major-number management and char-dev | |
779 | * registration. A stub ->open() callback forwards any open() requests to the | |
780 | * registered minor. | |
781 | */ | |
782 | ||
783 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
784 | { | |
785 | const struct file_operations *new_fops; | |
786 | struct drm_minor *minor; | |
787 | int err; | |
788 | ||
789 | DRM_DEBUG("\n"); | |
790 | ||
791 | mutex_lock(&drm_global_mutex); | |
792 | minor = drm_minor_acquire(iminor(inode)); | |
793 | if (IS_ERR(minor)) { | |
794 | err = PTR_ERR(minor); | |
795 | goto out_unlock; | |
796 | } | |
797 | ||
798 | new_fops = fops_get(minor->dev->driver->fops); | |
799 | if (!new_fops) { | |
800 | err = -ENODEV; | |
801 | goto out_release; | |
802 | } | |
803 | ||
804 | replace_fops(filp, new_fops); | |
805 | if (filp->f_op->open) | |
806 | err = filp->f_op->open(inode, filp); | |
807 | else | |
808 | err = 0; | |
809 | ||
810 | out_release: | |
811 | drm_minor_release(minor); | |
812 | out_unlock: | |
813 | mutex_unlock(&drm_global_mutex); | |
814 | return err; | |
815 | } | |
816 | ||
817 | static const struct file_operations drm_stub_fops = { | |
818 | .owner = THIS_MODULE, | |
819 | .open = drm_stub_open, | |
820 | .llseek = noop_llseek, | |
821 | }; | |
822 | ||
823 | static int __init drm_core_init(void) | |
824 | { | |
825 | int ret = -ENOMEM; | |
826 | ||
827 | drm_global_init(); | |
828 | drm_connector_ida_init(); | |
829 | idr_init(&drm_minors_idr); | |
830 | ||
831 | if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) | |
832 | goto err_p1; | |
833 | ||
fcc90213 DH |
834 | ret = drm_sysfs_init(); |
835 | if (ret < 0) { | |
1b7199fe | 836 | printk(KERN_ERR "DRM: Error creating drm class.\n"); |
1b7199fe DH |
837 | goto err_p2; |
838 | } | |
839 | ||
840 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
841 | if (!drm_debugfs_root) { | |
842 | DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); | |
843 | ret = -1; | |
844 | goto err_p3; | |
845 | } | |
846 | ||
82d5e73f | 847 | DRM_INFO("Initialized\n"); |
1b7199fe DH |
848 | return 0; |
849 | err_p3: | |
850 | drm_sysfs_destroy(); | |
851 | err_p2: | |
852 | unregister_chrdev(DRM_MAJOR, "drm"); | |
853 | ||
854 | idr_destroy(&drm_minors_idr); | |
855 | err_p1: | |
856 | return ret; | |
857 | } | |
858 | ||
859 | static void __exit drm_core_exit(void) | |
860 | { | |
861 | debugfs_remove(drm_debugfs_root); | |
862 | drm_sysfs_destroy(); | |
863 | ||
864 | unregister_chrdev(DRM_MAJOR, "drm"); | |
865 | ||
866 | drm_connector_ida_destroy(); | |
867 | idr_destroy(&drm_minors_idr); | |
868 | } | |
869 | ||
870 | module_init(drm_core_init); | |
871 | module_exit(drm_core_exit); |