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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 | |
a1f1a79c | 66 | void drm_err(const char *format, ...) |
5ad3d883 JP |
67 | { |
68 | struct va_format vaf; | |
69 | va_list args; | |
5ad3d883 JP |
70 | |
71 | va_start(args, format); | |
72 | ||
73 | vaf.fmt = format; | |
74 | vaf.va = &args; | |
75 | ||
2ee762b3 | 76 | printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV", |
a1f1a79c | 77 | __builtin_return_address(0), &vaf); |
5ad3d883 JP |
78 | |
79 | va_end(args); | |
5ad3d883 JP |
80 | } |
81 | EXPORT_SYMBOL(drm_err); | |
82 | ||
1287aa90 | 83 | void drm_ut_debug_printk(const char *function_name, const char *format, ...) |
4fefcb27 | 84 | { |
fffb9065 | 85 | struct va_format vaf; |
4fefcb27 | 86 | va_list args; |
1da177e4 | 87 | |
a73d4e91 LD |
88 | va_start(args, format); |
89 | vaf.fmt = format; | |
90 | vaf.va = &args; | |
91 | ||
0ed02983 | 92 | printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf); |
a73d4e91 LD |
93 | |
94 | va_end(args); | |
4fefcb27 | 95 | } |
96 | EXPORT_SYMBOL(drm_ut_debug_printk); | |
5ad3d883 | 97 | |
0d639883 DH |
98 | /* |
99 | * DRM Minors | |
100 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
101 | * of them is represented by a drm_minor object. Depending on the capabilities | |
102 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 103 | * |
0d639883 DH |
104 | * Minors can be accessed via dev->$minor_name. This pointer is either |
105 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
106 | * valid. This means, DRM minors have the same life-time as the underlying | |
107 | * device. However, this doesn't mean that the minor is active. Minors are | |
108 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 109 | */ |
0d639883 | 110 | |
05b701f6 DH |
111 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
112 | unsigned int type) | |
113 | { | |
114 | switch (type) { | |
a3ccc461 | 115 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
116 | return &dev->primary; |
117 | case DRM_MINOR_RENDER: | |
118 | return &dev->render; | |
119 | case DRM_MINOR_CONTROL: | |
120 | return &dev->control; | |
121 | default: | |
122 | return NULL; | |
123 | } | |
124 | } | |
125 | ||
126 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
127 | { | |
128 | struct drm_minor *minor; | |
f1b85962 DH |
129 | unsigned long flags; |
130 | int r; | |
05b701f6 DH |
131 | |
132 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
133 | if (!minor) | |
134 | return -ENOMEM; | |
135 | ||
136 | minor->type = type; | |
137 | minor->dev = dev; | |
05b701f6 | 138 | |
f1b85962 DH |
139 | idr_preload(GFP_KERNEL); |
140 | spin_lock_irqsave(&drm_minor_lock, flags); | |
141 | r = idr_alloc(&drm_minors_idr, | |
142 | NULL, | |
143 | 64 * type, | |
144 | 64 * (type + 1), | |
145 | GFP_NOWAIT); | |
146 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
147 | idr_preload_end(); | |
148 | ||
149 | if (r < 0) | |
150 | goto err_free; | |
151 | ||
152 | minor->index = r; | |
153 | ||
e1728075 DH |
154 | minor->kdev = drm_sysfs_minor_alloc(minor); |
155 | if (IS_ERR(minor->kdev)) { | |
156 | r = PTR_ERR(minor->kdev); | |
157 | goto err_index; | |
158 | } | |
159 | ||
05b701f6 DH |
160 | *drm_minor_get_slot(dev, type) = minor; |
161 | return 0; | |
f1b85962 | 162 | |
e1728075 DH |
163 | err_index: |
164 | spin_lock_irqsave(&drm_minor_lock, flags); | |
165 | idr_remove(&drm_minors_idr, minor->index); | |
166 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
167 | err_free: |
168 | kfree(minor); | |
169 | return r; | |
05b701f6 DH |
170 | } |
171 | ||
bd9dfa98 DH |
172 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
173 | { | |
f1b85962 DH |
174 | struct drm_minor **slot, *minor; |
175 | unsigned long flags; | |
bd9dfa98 DH |
176 | |
177 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
178 | minor = *slot; |
179 | if (!minor) | |
180 | return; | |
181 | ||
e1728075 | 182 | put_device(minor->kdev); |
f1b85962 DH |
183 | |
184 | spin_lock_irqsave(&drm_minor_lock, flags); | |
185 | idr_remove(&drm_minors_idr, minor->index); | |
186 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
187 | ||
188 | kfree(minor); | |
189 | *slot = NULL; | |
bd9dfa98 DH |
190 | } |
191 | ||
afcdbc86 | 192 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 193 | { |
f1b85962 | 194 | struct drm_minor *minor; |
0d639883 | 195 | unsigned long flags; |
1da177e4 | 196 | int ret; |
1da177e4 LT |
197 | |
198 | DRM_DEBUG("\n"); | |
199 | ||
f1b85962 DH |
200 | minor = *drm_minor_get_slot(dev, type); |
201 | if (!minor) | |
05b701f6 DH |
202 | return 0; |
203 | ||
f1b85962 | 204 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 205 | if (ret) { |
156f5a78 | 206 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
f1b85962 | 207 | return ret; |
955b12de | 208 | } |
2c14f28b | 209 | |
e1728075 DH |
210 | ret = device_add(minor->kdev); |
211 | if (ret) | |
cb6458f9 | 212 | goto err_debugfs; |
2c14f28b | 213 | |
0d639883 DH |
214 | /* replace NULL with @minor so lookups will succeed from now on */ |
215 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 216 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 217 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 218 | |
f1b85962 | 219 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
220 | return 0; |
221 | ||
cb6458f9 | 222 | err_debugfs: |
f1b85962 | 223 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
224 | return ret; |
225 | } | |
b5e89ed5 | 226 | |
afcdbc86 | 227 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 228 | { |
afcdbc86 | 229 | struct drm_minor *minor; |
0d639883 | 230 | unsigned long flags; |
afcdbc86 DH |
231 | |
232 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 233 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
234 | return; |
235 | ||
f1b85962 | 236 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 237 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 238 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 239 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 240 | |
e1728075 DH |
241 | device_del(minor->kdev); |
242 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 243 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
244 | } |
245 | ||
246 | /** | |
1616c525 DH |
247 | * drm_minor_acquire - Acquire a DRM minor |
248 | * @minor_id: Minor ID of the DRM-minor | |
249 | * | |
250 | * Looks up the given minor-ID and returns the respective DRM-minor object. The | |
251 | * refence-count of the underlying device is increased so you must release this | |
252 | * object with drm_minor_release(). | |
253 | * | |
254 | * As long as you hold this minor, it is guaranteed that the object and the | |
255 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
256 | * unregistered while you hold the minor. | |
f73aca50 | 257 | * |
1616c525 DH |
258 | * Returns: |
259 | * Pointer to minor-object with increased device-refcount, or PTR_ERR on | |
260 | * failure. | |
1da177e4 | 261 | */ |
1616c525 | 262 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 263 | { |
1616c525 | 264 | struct drm_minor *minor; |
0d639883 | 265 | unsigned long flags; |
1616c525 | 266 | |
0d639883 | 267 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 268 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 DH |
269 | if (minor) |
270 | drm_dev_ref(minor->dev); | |
271 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
272 | ||
273 | if (!minor) { | |
274 | return ERR_PTR(-ENODEV); | |
275 | } else if (drm_device_is_unplugged(minor->dev)) { | |
276 | drm_dev_unref(minor->dev); | |
1616c525 | 277 | return ERR_PTR(-ENODEV); |
0d639883 | 278 | } |
673a394b | 279 | |
1616c525 DH |
280 | return minor; |
281 | } | |
b5e89ed5 | 282 | |
1616c525 DH |
283 | /** |
284 | * drm_minor_release - Release DRM minor | |
285 | * @minor: Pointer to DRM minor object | |
286 | * | |
287 | * Release a minor that was previously acquired via drm_minor_acquire(). | |
288 | */ | |
289 | void drm_minor_release(struct drm_minor *minor) | |
290 | { | |
291 | drm_dev_unref(minor->dev); | |
1da177e4 | 292 | } |
112b715e | 293 | |
6e3f797c DV |
294 | /** |
295 | * DOC: driver instance overview | |
296 | * | |
297 | * A device instance for a drm driver is represented by struct &drm_device. This | |
298 | * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() | |
299 | * callbacks implemented by the driver. The driver then needs to initialize all | |
300 | * the various subsystems for the drm device like memory management, vblank | |
301 | * handling, modesetting support and intial output configuration plus obviously | |
a742946a DV |
302 | * initialize all the corresponding hardware bits. Finally when everything is up |
303 | * and running and ready for userspace the device instance can be published | |
304 | * using drm_dev_register(). | |
6e3f797c DV |
305 | * |
306 | * There is also deprecated support for initalizing device instances using | |
307 | * bus-specific helpers and the ->load() callback. But due to | |
308 | * backwards-compatibility needs the device instance have to be published too | |
309 | * early, which requires unpretty global locking to make safe and is therefore | |
310 | * only support for existing drivers not yet converted to the new scheme. | |
311 | * | |
312 | * When cleaning up a device instance everything needs to be done in reverse: | |
313 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
314 | * any other resources allocated at device initialization and drop the driver's | |
315 | * reference to &drm_device using drm_dev_unref(). | |
316 | * | |
317 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
318 | * historical baggage. Hence use the reference counting provided by | |
319 | * drm_dev_ref() and drm_dev_unref() only carefully. | |
320 | * | |
321 | * Also note that embedding of &drm_device is currently not (yet) supported (but | |
322 | * it would be easy to add). Drivers can store driver-private data in the | |
323 | * dev_priv field of &drm_device. | |
324 | */ | |
325 | ||
a742946a DV |
326 | static int drm_dev_set_unique(struct drm_device *dev, const char *name) |
327 | { | |
328 | kfree(dev->unique); | |
329 | dev->unique = kstrdup(name, GFP_KERNEL); | |
330 | ||
331 | return dev->unique ? 0 : -ENOMEM; | |
332 | } | |
333 | ||
112b715e | 334 | /** |
c6a1af8a TR |
335 | * drm_put_dev - Unregister and release a DRM device |
336 | * @dev: DRM device | |
112b715e | 337 | * |
c6a1af8a | 338 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 339 | * |
c6a1af8a | 340 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
341 | * |
342 | * Note: Use of this function is deprecated. It will eventually go away | |
343 | * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly | |
344 | * instead to make sure that the device isn't userspace accessible any more | |
345 | * while teardown is in progress, ensuring that userspace can't access an | |
346 | * inconsistent state. | |
112b715e KH |
347 | */ |
348 | void drm_put_dev(struct drm_device *dev) | |
349 | { | |
112b715e KH |
350 | DRM_DEBUG("\n"); |
351 | ||
352 | if (!dev) { | |
353 | DRM_ERROR("cleanup called no dev\n"); | |
354 | return; | |
355 | } | |
356 | ||
c3a49737 | 357 | drm_dev_unregister(dev); |
099d1c29 | 358 | drm_dev_unref(dev); |
112b715e KH |
359 | } |
360 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
361 | |
362 | void drm_unplug_dev(struct drm_device *dev) | |
363 | { | |
364 | /* for a USB device */ | |
a39be606 | 365 | drm_dev_unregister(dev); |
2c07a21d DA |
366 | |
367 | mutex_lock(&drm_global_mutex); | |
368 | ||
369 | drm_device_set_unplugged(dev); | |
370 | ||
371 | if (dev->open_count == 0) { | |
372 | drm_put_dev(dev); | |
373 | } | |
374 | mutex_unlock(&drm_global_mutex); | |
375 | } | |
376 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 377 | |
31bbe16f DH |
378 | /* |
379 | * DRM internal mount | |
380 | * We want to be able to allocate our own "struct address_space" to control | |
381 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
382 | * stand-alone address_space objects, so we need an underlying inode. As there | |
383 | * is no way to allocate an independent inode easily, we need a fake internal | |
384 | * VFS mount-point. | |
385 | * | |
386 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
387 | * frees it again. You are allowed to use iget() and iput() to get references to | |
388 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
389 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
390 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
391 | * between multiple inode-users. You could, technically, call | |
392 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
393 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
394 | */ | |
395 | ||
396 | static int drm_fs_cnt; | |
397 | static struct vfsmount *drm_fs_mnt; | |
398 | ||
399 | static const struct dentry_operations drm_fs_dops = { | |
400 | .d_dname = simple_dname, | |
401 | }; | |
402 | ||
403 | static const struct super_operations drm_fs_sops = { | |
404 | .statfs = simple_statfs, | |
405 | }; | |
406 | ||
407 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
408 | const char *dev_name, void *data) | |
409 | { | |
410 | return mount_pseudo(fs_type, | |
411 | "drm:", | |
412 | &drm_fs_sops, | |
413 | &drm_fs_dops, | |
414 | 0x010203ff); | |
415 | } | |
416 | ||
417 | static struct file_system_type drm_fs_type = { | |
418 | .name = "drm", | |
419 | .owner = THIS_MODULE, | |
420 | .mount = drm_fs_mount, | |
421 | .kill_sb = kill_anon_super, | |
422 | }; | |
423 | ||
424 | static struct inode *drm_fs_inode_new(void) | |
425 | { | |
426 | struct inode *inode; | |
427 | int r; | |
428 | ||
429 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
430 | if (r < 0) { | |
431 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
432 | return ERR_PTR(r); | |
433 | } | |
434 | ||
435 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
436 | if (IS_ERR(inode)) | |
437 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
438 | ||
439 | return inode; | |
440 | } | |
441 | ||
442 | static void drm_fs_inode_free(struct inode *inode) | |
443 | { | |
444 | if (inode) { | |
445 | iput(inode); | |
446 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
447 | } | |
448 | } | |
449 | ||
1bb72532 | 450 | /** |
b209aca3 CW |
451 | * drm_dev_init - Initialise new DRM device |
452 | * @dev: DRM device | |
453 | * @driver: DRM driver | |
1bb72532 DH |
454 | * @parent: Parent device object |
455 | * | |
b209aca3 | 456 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 457 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
458 | * with other core subsystems. This should be done last in the device |
459 | * initialization sequence to make sure userspace can't access an inconsistent | |
460 | * state. | |
1bb72532 | 461 | * |
099d1c29 DH |
462 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
463 | * drm_dev_unref() to take and drop further ref-counts. | |
464 | * | |
b0ff4b93 DV |
465 | * Note that for purely virtual devices @parent can be NULL. |
466 | * | |
b209aca3 CW |
467 | * Drivers that do not want to allocate their own device struct |
468 | * embedding struct &drm_device can call drm_dev_alloc() instead. | |
469 | * | |
1bb72532 | 470 | * RETURNS: |
b209aca3 | 471 | * 0 on success, or error code on failure. |
1bb72532 | 472 | */ |
b209aca3 CW |
473 | int drm_dev_init(struct drm_device *dev, |
474 | struct drm_driver *driver, | |
475 | struct device *parent) | |
1bb72532 | 476 | { |
1bb72532 DH |
477 | int ret; |
478 | ||
099d1c29 | 479 | kref_init(&dev->ref); |
1bb72532 DH |
480 | dev->dev = parent; |
481 | dev->driver = driver; | |
482 | ||
483 | INIT_LIST_HEAD(&dev->filelist); | |
484 | INIT_LIST_HEAD(&dev->ctxlist); | |
485 | INIT_LIST_HEAD(&dev->vmalist); | |
486 | INIT_LIST_HEAD(&dev->maplist); | |
487 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
488 | ||
2177a218 | 489 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
490 | spin_lock_init(&dev->event_lock); |
491 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 492 | mutex_init(&dev->filelist_mutex); |
1bb72532 | 493 | mutex_init(&dev->ctxlist_mutex); |
c996fd0b | 494 | mutex_init(&dev->master_mutex); |
1bb72532 | 495 | |
6796cb16 DH |
496 | dev->anon_inode = drm_fs_inode_new(); |
497 | if (IS_ERR(dev->anon_inode)) { | |
498 | ret = PTR_ERR(dev->anon_inode); | |
499 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 500 | goto err_free; |
6796cb16 DH |
501 | } |
502 | ||
05b701f6 DH |
503 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
504 | ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); | |
505 | if (ret) | |
506 | goto err_minors; | |
507 | } | |
508 | ||
6d6dfcfb | 509 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
510 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
511 | if (ret) | |
512 | goto err_minors; | |
513 | } | |
514 | ||
a3ccc461 | 515 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 DH |
516 | if (ret) |
517 | goto err_minors; | |
518 | ||
b209aca3 CW |
519 | ret = drm_ht_create(&dev->map_hash, 12); |
520 | if (ret) | |
05b701f6 | 521 | goto err_minors; |
1bb72532 | 522 | |
ba6976c1 | 523 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 524 | |
1bcecfac | 525 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
526 | ret = drm_gem_init(dev); |
527 | if (ret) { | |
528 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
529 | goto err_ctxbitmap; | |
530 | } | |
531 | } | |
532 | ||
5079c464 DV |
533 | /* Use the parent device name as DRM device unique identifier, but fall |
534 | * back to the driver name for virtual devices like vgem. */ | |
535 | ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name); | |
536 | if (ret) | |
537 | goto err_setunique; | |
e112e593 | 538 | |
b209aca3 | 539 | return 0; |
1bb72532 | 540 | |
e112e593 NI |
541 | err_setunique: |
542 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
543 | drm_gem_destroy(dev); | |
1bb72532 | 544 | err_ctxbitmap: |
e7b96070 | 545 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 546 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 547 | err_minors: |
a3ccc461 | 548 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 DH |
549 | drm_minor_free(dev, DRM_MINOR_RENDER); |
550 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 551 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 552 | err_free: |
c996fd0b | 553 | mutex_destroy(&dev->master_mutex); |
b209aca3 CW |
554 | return ret; |
555 | } | |
556 | EXPORT_SYMBOL(drm_dev_init); | |
557 | ||
558 | /** | |
559 | * drm_dev_alloc - Allocate new DRM device | |
560 | * @driver: DRM driver to allocate device for | |
561 | * @parent: Parent device object | |
562 | * | |
563 | * Allocate and initialize a new DRM device. No device registration is done. | |
564 | * Call drm_dev_register() to advertice the device to user space and register it | |
565 | * with other core subsystems. This should be done last in the device | |
566 | * initialization sequence to make sure userspace can't access an inconsistent | |
567 | * state. | |
568 | * | |
569 | * The initial ref-count of the object is 1. Use drm_dev_ref() and | |
570 | * drm_dev_unref() to take and drop further ref-counts. | |
571 | * | |
572 | * Note that for purely virtual devices @parent can be NULL. | |
573 | * | |
574 | * Drivers that wish to subclass or embed struct &drm_device into their | |
575 | * own struct should look at using drm_dev_init() instead. | |
576 | * | |
577 | * RETURNS: | |
578 | * Pointer to new DRM device, or NULL if out of memory. | |
579 | */ | |
580 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
581 | struct device *parent) | |
582 | { | |
583 | struct drm_device *dev; | |
584 | int ret; | |
585 | ||
586 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
587 | if (!dev) | |
588 | return NULL; | |
589 | ||
590 | ret = drm_dev_init(dev, driver, parent); | |
591 | if (ret) { | |
592 | kfree(dev); | |
593 | return NULL; | |
594 | } | |
595 | ||
596 | return dev; | |
1bb72532 DH |
597 | } |
598 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 599 | |
099d1c29 | 600 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 601 | { |
099d1c29 | 602 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 603 | |
1bcecfac | 604 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
0dc8fe59 DH |
605 | drm_gem_destroy(dev); |
606 | ||
e7b96070 | 607 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 608 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 609 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 610 | |
a3ccc461 | 611 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 DH |
612 | drm_minor_free(dev, DRM_MINOR_RENDER); |
613 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
614 | ||
c996fd0b | 615 | mutex_destroy(&dev->master_mutex); |
ca8e2ad7 | 616 | kfree(dev->unique); |
0dc8fe59 DH |
617 | kfree(dev); |
618 | } | |
099d1c29 DH |
619 | |
620 | /** | |
621 | * drm_dev_ref - Take reference of a DRM device | |
622 | * @dev: device to take reference of or NULL | |
623 | * | |
624 | * This increases the ref-count of @dev by one. You *must* already own a | |
625 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
626 | * again. | |
627 | * | |
628 | * This function never fails. However, this function does not provide *any* | |
629 | * guarantee whether the device is alive or running. It only provides a | |
630 | * reference to the object and the memory associated with it. | |
631 | */ | |
632 | void drm_dev_ref(struct drm_device *dev) | |
633 | { | |
634 | if (dev) | |
635 | kref_get(&dev->ref); | |
636 | } | |
637 | EXPORT_SYMBOL(drm_dev_ref); | |
638 | ||
639 | /** | |
640 | * drm_dev_unref - Drop reference of a DRM device | |
641 | * @dev: device to drop reference of or NULL | |
642 | * | |
643 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
644 | * ref-count drops to zero. | |
645 | */ | |
646 | void drm_dev_unref(struct drm_device *dev) | |
647 | { | |
648 | if (dev) | |
649 | kref_put(&dev->ref, drm_dev_release); | |
650 | } | |
651 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 652 | |
c22f0ace DH |
653 | /** |
654 | * drm_dev_register - Register DRM device | |
655 | * @dev: Device to register | |
c6a1af8a | 656 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
657 | * |
658 | * Register the DRM device @dev with the system, advertise device to user-space | |
659 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
e28cd4d0 | 660 | * previously. |
c22f0ace DH |
661 | * |
662 | * Never call this twice on any device! | |
663 | * | |
6e3f797c DV |
664 | * NOTE: To ensure backward compatibility with existing drivers method this |
665 | * function calls the ->load() method after registering the device nodes, | |
666 | * creating race conditions. Usage of the ->load() methods is therefore | |
667 | * deprecated, drivers must perform all initialization before calling | |
668 | * drm_dev_register(). | |
669 | * | |
c22f0ace DH |
670 | * RETURNS: |
671 | * 0 on success, negative error code on failure. | |
672 | */ | |
673 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
674 | { | |
675 | int ret; | |
676 | ||
677 | mutex_lock(&drm_global_mutex); | |
678 | ||
afcdbc86 | 679 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
680 | if (ret) |
681 | goto err_minors; | |
c22f0ace | 682 | |
afcdbc86 | 683 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
684 | if (ret) |
685 | goto err_minors; | |
c22f0ace | 686 | |
a3ccc461 | 687 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 688 | if (ret) |
05b701f6 | 689 | goto err_minors; |
c22f0ace DH |
690 | |
691 | if (dev->driver->load) { | |
692 | ret = dev->driver->load(dev, flags); | |
693 | if (ret) | |
05b701f6 | 694 | goto err_minors; |
c22f0ace DH |
695 | } |
696 | ||
bee7fb15 | 697 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 698 | drm_modeset_register_all(dev); |
e28cd4d0 | 699 | |
c22f0ace DH |
700 | ret = 0; |
701 | goto out_unlock; | |
702 | ||
05b701f6 | 703 | err_minors: |
a3ccc461 | 704 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 DH |
705 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
706 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
707 | out_unlock: |
708 | mutex_unlock(&drm_global_mutex); | |
709 | return ret; | |
710 | } | |
711 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
712 | |
713 | /** | |
714 | * drm_dev_unregister - Unregister DRM device | |
715 | * @dev: Device to unregister | |
716 | * | |
717 | * Unregister the DRM device from the system. This does the reverse of | |
718 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 719 | * drm_dev_unref() to drop their final reference. |
6e3f797c DV |
720 | * |
721 | * This should be called first in the device teardown code to make sure | |
722 | * userspace can't access the device instance any more. | |
c3a49737 DH |
723 | */ |
724 | void drm_dev_unregister(struct drm_device *dev) | |
725 | { | |
726 | struct drm_map_list *r_list, *list_temp; | |
727 | ||
728 | drm_lastclose(dev); | |
729 | ||
bee7fb15 | 730 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 731 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 732 | |
c3a49737 DH |
733 | if (dev->driver->unload) |
734 | dev->driver->unload(dev); | |
735 | ||
4efafebe DV |
736 | if (dev->agp) |
737 | drm_pci_agp_destroy(dev); | |
c3a49737 DH |
738 | |
739 | drm_vblank_cleanup(dev); | |
740 | ||
741 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) | |
9fc5cde7 | 742 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 743 | |
a3ccc461 | 744 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 DH |
745 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
746 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
747 | } |
748 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 749 | |
1b7199fe DH |
750 | /* |
751 | * DRM Core | |
752 | * The DRM core module initializes all global DRM objects and makes them | |
753 | * available to drivers. Once setup, drivers can probe their respective | |
754 | * devices. | |
755 | * Currently, core management includes: | |
756 | * - The "DRM-Global" key/value database | |
757 | * - Global ID management for connectors | |
758 | * - DRM major number allocation | |
759 | * - DRM minor management | |
760 | * - DRM sysfs class | |
761 | * - DRM debugfs root | |
762 | * | |
763 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
764 | * interface registered on a DRM device, you can request minor numbers from DRM | |
765 | * core. DRM core takes care of major-number management and char-dev | |
766 | * registration. A stub ->open() callback forwards any open() requests to the | |
767 | * registered minor. | |
768 | */ | |
769 | ||
770 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
771 | { | |
772 | const struct file_operations *new_fops; | |
773 | struct drm_minor *minor; | |
774 | int err; | |
775 | ||
776 | DRM_DEBUG("\n"); | |
777 | ||
778 | mutex_lock(&drm_global_mutex); | |
779 | minor = drm_minor_acquire(iminor(inode)); | |
780 | if (IS_ERR(minor)) { | |
781 | err = PTR_ERR(minor); | |
782 | goto out_unlock; | |
783 | } | |
784 | ||
785 | new_fops = fops_get(minor->dev->driver->fops); | |
786 | if (!new_fops) { | |
787 | err = -ENODEV; | |
788 | goto out_release; | |
789 | } | |
790 | ||
791 | replace_fops(filp, new_fops); | |
792 | if (filp->f_op->open) | |
793 | err = filp->f_op->open(inode, filp); | |
794 | else | |
795 | err = 0; | |
796 | ||
797 | out_release: | |
798 | drm_minor_release(minor); | |
799 | out_unlock: | |
800 | mutex_unlock(&drm_global_mutex); | |
801 | return err; | |
802 | } | |
803 | ||
804 | static const struct file_operations drm_stub_fops = { | |
805 | .owner = THIS_MODULE, | |
806 | .open = drm_stub_open, | |
807 | .llseek = noop_llseek, | |
808 | }; | |
809 | ||
810 | static int __init drm_core_init(void) | |
811 | { | |
812 | int ret = -ENOMEM; | |
813 | ||
814 | drm_global_init(); | |
815 | drm_connector_ida_init(); | |
816 | idr_init(&drm_minors_idr); | |
817 | ||
818 | if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) | |
819 | goto err_p1; | |
820 | ||
fcc90213 DH |
821 | ret = drm_sysfs_init(); |
822 | if (ret < 0) { | |
1b7199fe | 823 | printk(KERN_ERR "DRM: Error creating drm class.\n"); |
1b7199fe DH |
824 | goto err_p2; |
825 | } | |
826 | ||
827 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
828 | if (!drm_debugfs_root) { | |
829 | DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); | |
830 | ret = -1; | |
831 | goto err_p3; | |
832 | } | |
833 | ||
834 | DRM_INFO("Initialized %s %d.%d.%d %s\n", | |
835 | CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); | |
836 | return 0; | |
837 | err_p3: | |
838 | drm_sysfs_destroy(); | |
839 | err_p2: | |
840 | unregister_chrdev(DRM_MAJOR, "drm"); | |
841 | ||
842 | idr_destroy(&drm_minors_idr); | |
843 | err_p1: | |
844 | return ret; | |
845 | } | |
846 | ||
847 | static void __exit drm_core_exit(void) | |
848 | { | |
849 | debugfs_remove(drm_debugfs_root); | |
850 | drm_sysfs_destroy(); | |
851 | ||
852 | unregister_chrdev(DRM_MAJOR, "drm"); | |
853 | ||
854 | drm_connector_ida_destroy(); | |
855 | idr_destroy(&drm_minors_idr); | |
856 | } | |
857 | ||
858 | module_init(drm_core_init); | |
859 | module_exit(drm_core_exit); |