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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> |
85e634bc DV |
35 | |
36 | #include <drm/drm_drv.h> | |
760285e7 | 37 | #include <drm/drmP.h> |
85e634bc | 38 | |
79190ea2 | 39 | #include "drm_crtc_internal.h" |
e7b96070 | 40 | #include "drm_legacy.h" |
67d0ec4e | 41 | #include "drm_internal.h" |
81065548 | 42 | #include "drm_crtc_internal.h" |
1da177e4 | 43 | |
6dc3e22e EG |
44 | /* |
45 | * drm_debug: Enable debug output. | |
46 | * Bitmask of DRM_UT_x. See include/drm/drmP.h for details. | |
47 | */ | |
48 | unsigned int drm_debug = 0; | |
1da177e4 LT |
49 | EXPORT_SYMBOL(drm_debug); |
50 | ||
82d5e73f DH |
51 | MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
52 | MODULE_DESCRIPTION("DRM shared core routines"); | |
1da177e4 | 53 | MODULE_LICENSE("GPL and additional rights"); |
6dc3e22e EG |
54 | MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n" |
55 | "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n" | |
56 | "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n" | |
57 | "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n" | |
58 | "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n" | |
59 | "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n" | |
60 | "\t\tBit 5 (0x20) will enable VBL messages (vblank code)"); | |
c0758146 | 61 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 62 | |
0d639883 | 63 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 64 | static struct idr drm_minors_idr; |
2c14f28b | 65 | |
1b7199fe | 66 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 67 | |
c4e68a58 SP |
68 | #define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV" |
69 | ||
70 | void drm_dev_printk(const struct device *dev, const char *level, | |
71 | unsigned int category, const char *function_name, | |
72 | const char *prefix, const char *format, ...) | |
5ad3d883 JP |
73 | { |
74 | struct va_format vaf; | |
75 | va_list args; | |
5ad3d883 | 76 | |
c4e68a58 SP |
77 | if (category != DRM_UT_NONE && !(drm_debug & category)) |
78 | return; | |
5ad3d883 | 79 | |
c4e68a58 | 80 | va_start(args, format); |
5ad3d883 JP |
81 | vaf.fmt = format; |
82 | vaf.va = &args; | |
83 | ||
b4ba97e7 CW |
84 | if (dev) |
85 | dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix, | |
86 | &vaf); | |
87 | else | |
88 | printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf); | |
5ad3d883 JP |
89 | |
90 | va_end(args); | |
5ad3d883 | 91 | } |
c4e68a58 | 92 | EXPORT_SYMBOL(drm_dev_printk); |
5ad3d883 | 93 | |
c4e68a58 | 94 | void drm_printk(const char *level, unsigned int category, |
c4e68a58 | 95 | const char *format, ...) |
4fefcb27 | 96 | { |
fffb9065 | 97 | struct va_format vaf; |
4fefcb27 | 98 | va_list args; |
1da177e4 | 99 | |
c4e68a58 SP |
100 | if (category != DRM_UT_NONE && !(drm_debug & category)) |
101 | return; | |
102 | ||
a73d4e91 LD |
103 | va_start(args, format); |
104 | vaf.fmt = format; | |
105 | vaf.va = &args; | |
106 | ||
6bd488db JP |
107 | printk("%s" "[" DRM_NAME ":%ps]%s %pV", |
108 | level, __builtin_return_address(0), | |
109 | strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf); | |
a73d4e91 LD |
110 | |
111 | va_end(args); | |
4fefcb27 | 112 | } |
c4e68a58 | 113 | EXPORT_SYMBOL(drm_printk); |
5ad3d883 | 114 | |
0d639883 DH |
115 | /* |
116 | * DRM Minors | |
117 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
118 | * of them is represented by a drm_minor object. Depending on the capabilities | |
119 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 120 | * |
0d639883 DH |
121 | * Minors can be accessed via dev->$minor_name. This pointer is either |
122 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
123 | * valid. This means, DRM minors have the same life-time as the underlying | |
124 | * device. However, this doesn't mean that the minor is active. Minors are | |
125 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 126 | */ |
0d639883 | 127 | |
05b701f6 DH |
128 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
129 | unsigned int type) | |
130 | { | |
131 | switch (type) { | |
a3ccc461 | 132 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
133 | return &dev->primary; |
134 | case DRM_MINOR_RENDER: | |
135 | return &dev->render; | |
136 | case DRM_MINOR_CONTROL: | |
137 | return &dev->control; | |
138 | default: | |
139 | return NULL; | |
140 | } | |
141 | } | |
142 | ||
143 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
144 | { | |
145 | struct drm_minor *minor; | |
f1b85962 DH |
146 | unsigned long flags; |
147 | int r; | |
05b701f6 DH |
148 | |
149 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
150 | if (!minor) | |
151 | return -ENOMEM; | |
152 | ||
153 | minor->type = type; | |
154 | minor->dev = dev; | |
05b701f6 | 155 | |
f1b85962 DH |
156 | idr_preload(GFP_KERNEL); |
157 | spin_lock_irqsave(&drm_minor_lock, flags); | |
158 | r = idr_alloc(&drm_minors_idr, | |
159 | NULL, | |
160 | 64 * type, | |
161 | 64 * (type + 1), | |
162 | GFP_NOWAIT); | |
163 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
164 | idr_preload_end(); | |
165 | ||
166 | if (r < 0) | |
167 | goto err_free; | |
168 | ||
169 | minor->index = r; | |
170 | ||
e1728075 DH |
171 | minor->kdev = drm_sysfs_minor_alloc(minor); |
172 | if (IS_ERR(minor->kdev)) { | |
173 | r = PTR_ERR(minor->kdev); | |
174 | goto err_index; | |
175 | } | |
176 | ||
05b701f6 DH |
177 | *drm_minor_get_slot(dev, type) = minor; |
178 | return 0; | |
f1b85962 | 179 | |
e1728075 DH |
180 | err_index: |
181 | spin_lock_irqsave(&drm_minor_lock, flags); | |
182 | idr_remove(&drm_minors_idr, minor->index); | |
183 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
184 | err_free: |
185 | kfree(minor); | |
186 | return r; | |
05b701f6 DH |
187 | } |
188 | ||
bd9dfa98 DH |
189 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
190 | { | |
f1b85962 DH |
191 | struct drm_minor **slot, *minor; |
192 | unsigned long flags; | |
bd9dfa98 DH |
193 | |
194 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
195 | minor = *slot; |
196 | if (!minor) | |
197 | return; | |
198 | ||
e1728075 | 199 | put_device(minor->kdev); |
f1b85962 DH |
200 | |
201 | spin_lock_irqsave(&drm_minor_lock, flags); | |
202 | idr_remove(&drm_minors_idr, minor->index); | |
203 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
204 | ||
205 | kfree(minor); | |
206 | *slot = NULL; | |
bd9dfa98 DH |
207 | } |
208 | ||
afcdbc86 | 209 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 210 | { |
f1b85962 | 211 | struct drm_minor *minor; |
0d639883 | 212 | unsigned long flags; |
1da177e4 | 213 | int ret; |
1da177e4 LT |
214 | |
215 | DRM_DEBUG("\n"); | |
216 | ||
f1b85962 DH |
217 | minor = *drm_minor_get_slot(dev, type); |
218 | if (!minor) | |
05b701f6 DH |
219 | return 0; |
220 | ||
f1b85962 | 221 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 222 | if (ret) { |
156f5a78 | 223 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
f1b85962 | 224 | return ret; |
955b12de | 225 | } |
2c14f28b | 226 | |
e1728075 DH |
227 | ret = device_add(minor->kdev); |
228 | if (ret) | |
cb6458f9 | 229 | goto err_debugfs; |
2c14f28b | 230 | |
0d639883 DH |
231 | /* replace NULL with @minor so lookups will succeed from now on */ |
232 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 233 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 234 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 235 | |
f1b85962 | 236 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
237 | return 0; |
238 | ||
cb6458f9 | 239 | err_debugfs: |
f1b85962 | 240 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
241 | return ret; |
242 | } | |
b5e89ed5 | 243 | |
afcdbc86 | 244 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 245 | { |
afcdbc86 | 246 | struct drm_minor *minor; |
0d639883 | 247 | unsigned long flags; |
afcdbc86 DH |
248 | |
249 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 250 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
251 | return; |
252 | ||
f1b85962 | 253 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 254 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 255 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 256 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 257 | |
e1728075 DH |
258 | device_del(minor->kdev); |
259 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 260 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
261 | } |
262 | ||
85e634bc | 263 | /* |
1616c525 DH |
264 | * Looks up the given minor-ID and returns the respective DRM-minor object. The |
265 | * refence-count of the underlying device is increased so you must release this | |
266 | * object with drm_minor_release(). | |
267 | * | |
268 | * As long as you hold this minor, it is guaranteed that the object and the | |
269 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
270 | * unregistered while you hold the minor. | |
1da177e4 | 271 | */ |
1616c525 | 272 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 273 | { |
1616c525 | 274 | struct drm_minor *minor; |
0d639883 | 275 | unsigned long flags; |
1616c525 | 276 | |
0d639883 | 277 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 278 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 DH |
279 | if (minor) |
280 | drm_dev_ref(minor->dev); | |
281 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
282 | ||
283 | if (!minor) { | |
284 | return ERR_PTR(-ENODEV); | |
285 | } else if (drm_device_is_unplugged(minor->dev)) { | |
286 | drm_dev_unref(minor->dev); | |
1616c525 | 287 | return ERR_PTR(-ENODEV); |
0d639883 | 288 | } |
673a394b | 289 | |
1616c525 DH |
290 | return minor; |
291 | } | |
b5e89ed5 | 292 | |
1616c525 DH |
293 | void drm_minor_release(struct drm_minor *minor) |
294 | { | |
295 | drm_dev_unref(minor->dev); | |
1da177e4 | 296 | } |
112b715e | 297 | |
6e3f797c DV |
298 | /** |
299 | * DOC: driver instance overview | |
300 | * | |
301 | * A device instance for a drm driver is represented by struct &drm_device. This | |
302 | * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() | |
303 | * callbacks implemented by the driver. The driver then needs to initialize all | |
304 | * the various subsystems for the drm device like memory management, vblank | |
305 | * handling, modesetting support and intial output configuration plus obviously | |
a6b5fac5 GH |
306 | * initialize all the corresponding hardware bits. An important part of this is |
307 | * also calling drm_dev_set_unique() to set the userspace-visible unique name of | |
308 | * this device instance. Finally when everything is up and running and ready for | |
309 | * userspace the device instance can be published using drm_dev_register(). | |
6e3f797c DV |
310 | * |
311 | * There is also deprecated support for initalizing device instances using | |
312 | * bus-specific helpers and the ->load() callback. But due to | |
313 | * backwards-compatibility needs the device instance have to be published too | |
314 | * early, which requires unpretty global locking to make safe and is therefore | |
315 | * only support for existing drivers not yet converted to the new scheme. | |
316 | * | |
317 | * When cleaning up a device instance everything needs to be done in reverse: | |
318 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
319 | * any other resources allocated at device initialization and drop the driver's | |
320 | * reference to &drm_device using drm_dev_unref(). | |
321 | * | |
322 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
323 | * historical baggage. Hence use the reference counting provided by | |
324 | * drm_dev_ref() and drm_dev_unref() only carefully. | |
325 | * | |
326 | * Also note that embedding of &drm_device is currently not (yet) supported (but | |
327 | * it would be easy to add). Drivers can store driver-private data in the | |
328 | * dev_priv field of &drm_device. | |
329 | */ | |
330 | ||
112b715e | 331 | /** |
c6a1af8a TR |
332 | * drm_put_dev - Unregister and release a DRM device |
333 | * @dev: DRM device | |
112b715e | 334 | * |
c6a1af8a | 335 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 336 | * |
c6a1af8a | 337 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
338 | * |
339 | * Note: Use of this function is deprecated. It will eventually go away | |
340 | * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly | |
341 | * instead to make sure that the device isn't userspace accessible any more | |
342 | * while teardown is in progress, ensuring that userspace can't access an | |
343 | * inconsistent state. | |
112b715e KH |
344 | */ |
345 | void drm_put_dev(struct drm_device *dev) | |
346 | { | |
112b715e KH |
347 | DRM_DEBUG("\n"); |
348 | ||
349 | if (!dev) { | |
350 | DRM_ERROR("cleanup called no dev\n"); | |
351 | return; | |
352 | } | |
353 | ||
c3a49737 | 354 | drm_dev_unregister(dev); |
099d1c29 | 355 | drm_dev_unref(dev); |
112b715e KH |
356 | } |
357 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
358 | |
359 | void drm_unplug_dev(struct drm_device *dev) | |
360 | { | |
361 | /* for a USB device */ | |
a39be606 | 362 | drm_dev_unregister(dev); |
2c07a21d DA |
363 | |
364 | mutex_lock(&drm_global_mutex); | |
365 | ||
366 | drm_device_set_unplugged(dev); | |
367 | ||
368 | if (dev->open_count == 0) { | |
369 | drm_put_dev(dev); | |
370 | } | |
371 | mutex_unlock(&drm_global_mutex); | |
372 | } | |
373 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 374 | |
31bbe16f DH |
375 | /* |
376 | * DRM internal mount | |
377 | * We want to be able to allocate our own "struct address_space" to control | |
378 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
379 | * stand-alone address_space objects, so we need an underlying inode. As there | |
380 | * is no way to allocate an independent inode easily, we need a fake internal | |
381 | * VFS mount-point. | |
382 | * | |
383 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
384 | * frees it again. You are allowed to use iget() and iput() to get references to | |
385 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
386 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
387 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
388 | * between multiple inode-users. You could, technically, call | |
389 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
390 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
391 | */ | |
392 | ||
393 | static int drm_fs_cnt; | |
394 | static struct vfsmount *drm_fs_mnt; | |
395 | ||
396 | static const struct dentry_operations drm_fs_dops = { | |
397 | .d_dname = simple_dname, | |
398 | }; | |
399 | ||
400 | static const struct super_operations drm_fs_sops = { | |
401 | .statfs = simple_statfs, | |
402 | }; | |
403 | ||
404 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
405 | const char *dev_name, void *data) | |
406 | { | |
407 | return mount_pseudo(fs_type, | |
408 | "drm:", | |
409 | &drm_fs_sops, | |
410 | &drm_fs_dops, | |
411 | 0x010203ff); | |
412 | } | |
413 | ||
414 | static struct file_system_type drm_fs_type = { | |
415 | .name = "drm", | |
416 | .owner = THIS_MODULE, | |
417 | .mount = drm_fs_mount, | |
418 | .kill_sb = kill_anon_super, | |
419 | }; | |
420 | ||
421 | static struct inode *drm_fs_inode_new(void) | |
422 | { | |
423 | struct inode *inode; | |
424 | int r; | |
425 | ||
426 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
427 | if (r < 0) { | |
428 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
429 | return ERR_PTR(r); | |
430 | } | |
431 | ||
432 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
433 | if (IS_ERR(inode)) | |
434 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
435 | ||
436 | return inode; | |
437 | } | |
438 | ||
439 | static void drm_fs_inode_free(struct inode *inode) | |
440 | { | |
441 | if (inode) { | |
442 | iput(inode); | |
443 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
444 | } | |
445 | } | |
446 | ||
1bb72532 | 447 | /** |
b209aca3 CW |
448 | * drm_dev_init - Initialise new DRM device |
449 | * @dev: DRM device | |
450 | * @driver: DRM driver | |
1bb72532 DH |
451 | * @parent: Parent device object |
452 | * | |
b209aca3 | 453 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 454 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
455 | * with other core subsystems. This should be done last in the device |
456 | * initialization sequence to make sure userspace can't access an inconsistent | |
457 | * state. | |
1bb72532 | 458 | * |
099d1c29 DH |
459 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
460 | * drm_dev_unref() to take and drop further ref-counts. | |
461 | * | |
b0ff4b93 DV |
462 | * Note that for purely virtual devices @parent can be NULL. |
463 | * | |
b209aca3 CW |
464 | * Drivers that do not want to allocate their own device struct |
465 | * embedding struct &drm_device can call drm_dev_alloc() instead. | |
466 | * | |
1bb72532 | 467 | * RETURNS: |
b209aca3 | 468 | * 0 on success, or error code on failure. |
1bb72532 | 469 | */ |
b209aca3 CW |
470 | int drm_dev_init(struct drm_device *dev, |
471 | struct drm_driver *driver, | |
472 | struct device *parent) | |
1bb72532 | 473 | { |
1bb72532 DH |
474 | int ret; |
475 | ||
099d1c29 | 476 | kref_init(&dev->ref); |
1bb72532 DH |
477 | dev->dev = parent; |
478 | dev->driver = driver; | |
479 | ||
480 | INIT_LIST_HEAD(&dev->filelist); | |
481 | INIT_LIST_HEAD(&dev->ctxlist); | |
482 | INIT_LIST_HEAD(&dev->vmalist); | |
483 | INIT_LIST_HEAD(&dev->maplist); | |
484 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
485 | ||
2177a218 | 486 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
487 | spin_lock_init(&dev->event_lock); |
488 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 489 | mutex_init(&dev->filelist_mutex); |
1bb72532 | 490 | mutex_init(&dev->ctxlist_mutex); |
c996fd0b | 491 | mutex_init(&dev->master_mutex); |
1bb72532 | 492 | |
6796cb16 DH |
493 | dev->anon_inode = drm_fs_inode_new(); |
494 | if (IS_ERR(dev->anon_inode)) { | |
495 | ret = PTR_ERR(dev->anon_inode); | |
496 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 497 | goto err_free; |
6796cb16 DH |
498 | } |
499 | ||
6d6dfcfb | 500 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
501 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
502 | if (ret) | |
503 | goto err_minors; | |
504 | } | |
505 | ||
a3ccc461 | 506 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 DH |
507 | if (ret) |
508 | goto err_minors; | |
509 | ||
b209aca3 CW |
510 | ret = drm_ht_create(&dev->map_hash, 12); |
511 | if (ret) | |
05b701f6 | 512 | goto err_minors; |
1bb72532 | 513 | |
ba6976c1 | 514 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 515 | |
1bcecfac | 516 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
517 | ret = drm_gem_init(dev); |
518 | if (ret) { | |
519 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
520 | goto err_ctxbitmap; | |
521 | } | |
522 | } | |
523 | ||
5079c464 DV |
524 | /* Use the parent device name as DRM device unique identifier, but fall |
525 | * back to the driver name for virtual devices like vgem. */ | |
526 | ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name); | |
527 | if (ret) | |
528 | goto err_setunique; | |
e112e593 | 529 | |
b209aca3 | 530 | return 0; |
1bb72532 | 531 | |
e112e593 NI |
532 | err_setunique: |
533 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
534 | drm_gem_destroy(dev); | |
1bb72532 | 535 | err_ctxbitmap: |
e7b96070 | 536 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 537 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 538 | err_minors: |
a3ccc461 | 539 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 DH |
540 | drm_minor_free(dev, DRM_MINOR_RENDER); |
541 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 542 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 543 | err_free: |
c996fd0b | 544 | mutex_destroy(&dev->master_mutex); |
f92e1ee5 JL |
545 | mutex_destroy(&dev->ctxlist_mutex); |
546 | mutex_destroy(&dev->filelist_mutex); | |
547 | mutex_destroy(&dev->struct_mutex); | |
b209aca3 CW |
548 | return ret; |
549 | } | |
550 | EXPORT_SYMBOL(drm_dev_init); | |
551 | ||
552 | /** | |
553 | * drm_dev_alloc - Allocate new DRM device | |
554 | * @driver: DRM driver to allocate device for | |
555 | * @parent: Parent device object | |
556 | * | |
557 | * Allocate and initialize a new DRM device. No device registration is done. | |
558 | * Call drm_dev_register() to advertice the device to user space and register it | |
559 | * with other core subsystems. This should be done last in the device | |
560 | * initialization sequence to make sure userspace can't access an inconsistent | |
561 | * state. | |
562 | * | |
563 | * The initial ref-count of the object is 1. Use drm_dev_ref() and | |
564 | * drm_dev_unref() to take and drop further ref-counts. | |
565 | * | |
566 | * Note that for purely virtual devices @parent can be NULL. | |
567 | * | |
568 | * Drivers that wish to subclass or embed struct &drm_device into their | |
569 | * own struct should look at using drm_dev_init() instead. | |
570 | * | |
571 | * RETURNS: | |
0f288605 | 572 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 CW |
573 | */ |
574 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
575 | struct device *parent) | |
576 | { | |
577 | struct drm_device *dev; | |
578 | int ret; | |
579 | ||
580 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
581 | if (!dev) | |
0f288605 | 582 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
583 | |
584 | ret = drm_dev_init(dev, driver, parent); | |
585 | if (ret) { | |
586 | kfree(dev); | |
0f288605 | 587 | return ERR_PTR(ret); |
b209aca3 CW |
588 | } |
589 | ||
590 | return dev; | |
1bb72532 DH |
591 | } |
592 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 593 | |
099d1c29 | 594 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 595 | { |
099d1c29 | 596 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 597 | |
1bcecfac | 598 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
0dc8fe59 DH |
599 | drm_gem_destroy(dev); |
600 | ||
e7b96070 | 601 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 602 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 603 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 604 | |
a3ccc461 | 605 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 DH |
606 | drm_minor_free(dev, DRM_MINOR_RENDER); |
607 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
608 | ||
c996fd0b | 609 | mutex_destroy(&dev->master_mutex); |
f92e1ee5 JL |
610 | mutex_destroy(&dev->ctxlist_mutex); |
611 | mutex_destroy(&dev->filelist_mutex); | |
612 | mutex_destroy(&dev->struct_mutex); | |
ca8e2ad7 | 613 | kfree(dev->unique); |
0dc8fe59 DH |
614 | kfree(dev); |
615 | } | |
099d1c29 DH |
616 | |
617 | /** | |
618 | * drm_dev_ref - Take reference of a DRM device | |
619 | * @dev: device to take reference of or NULL | |
620 | * | |
621 | * This increases the ref-count of @dev by one. You *must* already own a | |
622 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
623 | * again. | |
624 | * | |
625 | * This function never fails. However, this function does not provide *any* | |
626 | * guarantee whether the device is alive or running. It only provides a | |
627 | * reference to the object and the memory associated with it. | |
628 | */ | |
629 | void drm_dev_ref(struct drm_device *dev) | |
630 | { | |
631 | if (dev) | |
632 | kref_get(&dev->ref); | |
633 | } | |
634 | EXPORT_SYMBOL(drm_dev_ref); | |
635 | ||
636 | /** | |
637 | * drm_dev_unref - Drop reference of a DRM device | |
638 | * @dev: device to drop reference of or NULL | |
639 | * | |
640 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
641 | * ref-count drops to zero. | |
642 | */ | |
643 | void drm_dev_unref(struct drm_device *dev) | |
644 | { | |
645 | if (dev) | |
646 | kref_put(&dev->ref, drm_dev_release); | |
647 | } | |
648 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 649 | |
c22f0ace DH |
650 | /** |
651 | * drm_dev_register - Register DRM device | |
652 | * @dev: Device to register | |
c6a1af8a | 653 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
654 | * |
655 | * Register the DRM device @dev with the system, advertise device to user-space | |
656 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
e28cd4d0 | 657 | * previously. |
c22f0ace DH |
658 | * |
659 | * Never call this twice on any device! | |
660 | * | |
6e3f797c DV |
661 | * NOTE: To ensure backward compatibility with existing drivers method this |
662 | * function calls the ->load() method after registering the device nodes, | |
663 | * creating race conditions. Usage of the ->load() methods is therefore | |
664 | * deprecated, drivers must perform all initialization before calling | |
665 | * drm_dev_register(). | |
666 | * | |
c22f0ace DH |
667 | * RETURNS: |
668 | * 0 on success, negative error code on failure. | |
669 | */ | |
670 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
671 | { | |
672 | int ret; | |
673 | ||
674 | mutex_lock(&drm_global_mutex); | |
675 | ||
afcdbc86 | 676 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
677 | if (ret) |
678 | goto err_minors; | |
c22f0ace | 679 | |
afcdbc86 | 680 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
681 | if (ret) |
682 | goto err_minors; | |
c22f0ace | 683 | |
a3ccc461 | 684 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 685 | if (ret) |
05b701f6 | 686 | goto err_minors; |
c22f0ace DH |
687 | |
688 | if (dev->driver->load) { | |
689 | ret = dev->driver->load(dev, flags); | |
690 | if (ret) | |
05b701f6 | 691 | goto err_minors; |
c22f0ace DH |
692 | } |
693 | ||
bee7fb15 | 694 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 695 | drm_modeset_register_all(dev); |
e28cd4d0 | 696 | |
c22f0ace DH |
697 | ret = 0; |
698 | goto out_unlock; | |
699 | ||
05b701f6 | 700 | err_minors: |
a3ccc461 | 701 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 DH |
702 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
703 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
704 | out_unlock: |
705 | mutex_unlock(&drm_global_mutex); | |
706 | return ret; | |
707 | } | |
708 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
709 | |
710 | /** | |
711 | * drm_dev_unregister - Unregister DRM device | |
712 | * @dev: Device to unregister | |
713 | * | |
714 | * Unregister the DRM device from the system. This does the reverse of | |
715 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 716 | * drm_dev_unref() to drop their final reference. |
6e3f797c DV |
717 | * |
718 | * This should be called first in the device teardown code to make sure | |
719 | * userspace can't access the device instance any more. | |
c3a49737 DH |
720 | */ |
721 | void drm_dev_unregister(struct drm_device *dev) | |
722 | { | |
723 | struct drm_map_list *r_list, *list_temp; | |
724 | ||
725 | drm_lastclose(dev); | |
726 | ||
bee7fb15 | 727 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 728 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 729 | |
c3a49737 DH |
730 | if (dev->driver->unload) |
731 | dev->driver->unload(dev); | |
732 | ||
4efafebe DV |
733 | if (dev->agp) |
734 | drm_pci_agp_destroy(dev); | |
c3a49737 DH |
735 | |
736 | drm_vblank_cleanup(dev); | |
737 | ||
738 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) | |
9fc5cde7 | 739 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 740 | |
a3ccc461 | 741 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 DH |
742 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
743 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
744 | } |
745 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 746 | |
a6b5fac5 GH |
747 | /** |
748 | * drm_dev_set_unique - Set the unique name of a DRM device | |
749 | * @dev: device of which to set the unique name | |
750 | * @name: unique name | |
751 | * | |
752 | * Sets the unique name of a DRM device using the specified string. Drivers | |
753 | * can use this at driver probe time if the unique name of the devices they | |
754 | * drive is static. | |
755 | * | |
756 | * Return: 0 on success or a negative error code on failure. | |
757 | */ | |
758 | int drm_dev_set_unique(struct drm_device *dev, const char *name) | |
759 | { | |
760 | kfree(dev->unique); | |
761 | dev->unique = kstrdup(name, GFP_KERNEL); | |
762 | ||
763 | return dev->unique ? 0 : -ENOMEM; | |
764 | } | |
765 | EXPORT_SYMBOL(drm_dev_set_unique); | |
766 | ||
1b7199fe DH |
767 | /* |
768 | * DRM Core | |
769 | * The DRM core module initializes all global DRM objects and makes them | |
770 | * available to drivers. Once setup, drivers can probe their respective | |
771 | * devices. | |
772 | * Currently, core management includes: | |
773 | * - The "DRM-Global" key/value database | |
774 | * - Global ID management for connectors | |
775 | * - DRM major number allocation | |
776 | * - DRM minor management | |
777 | * - DRM sysfs class | |
778 | * - DRM debugfs root | |
779 | * | |
780 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
781 | * interface registered on a DRM device, you can request minor numbers from DRM | |
782 | * core. DRM core takes care of major-number management and char-dev | |
783 | * registration. A stub ->open() callback forwards any open() requests to the | |
784 | * registered minor. | |
785 | */ | |
786 | ||
787 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
788 | { | |
789 | const struct file_operations *new_fops; | |
790 | struct drm_minor *minor; | |
791 | int err; | |
792 | ||
793 | DRM_DEBUG("\n"); | |
794 | ||
795 | mutex_lock(&drm_global_mutex); | |
796 | minor = drm_minor_acquire(iminor(inode)); | |
797 | if (IS_ERR(minor)) { | |
798 | err = PTR_ERR(minor); | |
799 | goto out_unlock; | |
800 | } | |
801 | ||
802 | new_fops = fops_get(minor->dev->driver->fops); | |
803 | if (!new_fops) { | |
804 | err = -ENODEV; | |
805 | goto out_release; | |
806 | } | |
807 | ||
808 | replace_fops(filp, new_fops); | |
809 | if (filp->f_op->open) | |
810 | err = filp->f_op->open(inode, filp); | |
811 | else | |
812 | err = 0; | |
813 | ||
814 | out_release: | |
815 | drm_minor_release(minor); | |
816 | out_unlock: | |
817 | mutex_unlock(&drm_global_mutex); | |
818 | return err; | |
819 | } | |
820 | ||
821 | static const struct file_operations drm_stub_fops = { | |
822 | .owner = THIS_MODULE, | |
823 | .open = drm_stub_open, | |
824 | .llseek = noop_llseek, | |
825 | }; | |
826 | ||
2cc107dc DH |
827 | static void drm_core_exit(void) |
828 | { | |
829 | unregister_chrdev(DRM_MAJOR, "drm"); | |
830 | debugfs_remove(drm_debugfs_root); | |
831 | drm_sysfs_destroy(); | |
832 | idr_destroy(&drm_minors_idr); | |
833 | drm_connector_ida_destroy(); | |
834 | drm_global_release(); | |
835 | } | |
836 | ||
1b7199fe DH |
837 | static int __init drm_core_init(void) |
838 | { | |
2cc107dc | 839 | int ret; |
1b7199fe DH |
840 | |
841 | drm_global_init(); | |
842 | drm_connector_ida_init(); | |
843 | idr_init(&drm_minors_idr); | |
844 | ||
fcc90213 DH |
845 | ret = drm_sysfs_init(); |
846 | if (ret < 0) { | |
2cc107dc DH |
847 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
848 | goto error; | |
1b7199fe DH |
849 | } |
850 | ||
851 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
852 | if (!drm_debugfs_root) { | |
2cc107dc DH |
853 | ret = -ENOMEM; |
854 | DRM_ERROR("Cannot create debugfs-root: %d\n", ret); | |
855 | goto error; | |
1b7199fe DH |
856 | } |
857 | ||
2cc107dc DH |
858 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
859 | if (ret < 0) | |
860 | goto error; | |
861 | ||
82d5e73f | 862 | DRM_INFO("Initialized\n"); |
1b7199fe | 863 | return 0; |
1b7199fe | 864 | |
2cc107dc DH |
865 | error: |
866 | drm_core_exit(); | |
1b7199fe DH |
867 | return ret; |
868 | } | |
869 | ||
1b7199fe DH |
870 | module_init(drm_core_init); |
871 | module_exit(drm_core_exit); |