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