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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"); |
a67834f8 | 224 | goto err_debugfs; |
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 | * | |
ea0dd85a | 301 | * A device instance for a drm driver is represented by &struct drm_device. This |
6e3f797c DV |
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 | |
ef40cbf9 | 312 | * bus-specific helpers and the &drm_driver.load callback. But due to |
6e3f797c DV |
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 | * | |
ea0dd85a | 326 | * It is recommended that drivers embed &struct drm_device into their own device |
d82faafd | 327 | * structure, which is supported through drm_dev_init(). |
6e3f797c DV |
328 | */ |
329 | ||
112b715e | 330 | /** |
c6a1af8a TR |
331 | * drm_put_dev - Unregister and release a DRM device |
332 | * @dev: DRM device | |
112b715e | 333 | * |
c6a1af8a | 334 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 335 | * |
c6a1af8a | 336 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
337 | * |
338 | * Note: Use of this function is deprecated. It will eventually go away | |
339 | * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly | |
340 | * instead to make sure that the device isn't userspace accessible any more | |
341 | * while teardown is in progress, ensuring that userspace can't access an | |
342 | * inconsistent state. | |
112b715e KH |
343 | */ |
344 | void drm_put_dev(struct drm_device *dev) | |
345 | { | |
112b715e KH |
346 | DRM_DEBUG("\n"); |
347 | ||
348 | if (!dev) { | |
349 | DRM_ERROR("cleanup called no dev\n"); | |
350 | return; | |
351 | } | |
352 | ||
c3a49737 | 353 | drm_dev_unregister(dev); |
099d1c29 | 354 | drm_dev_unref(dev); |
112b715e KH |
355 | } |
356 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d DA |
357 | |
358 | void drm_unplug_dev(struct drm_device *dev) | |
359 | { | |
360 | /* for a USB device */ | |
a39be606 | 361 | drm_dev_unregister(dev); |
2c07a21d DA |
362 | |
363 | mutex_lock(&drm_global_mutex); | |
364 | ||
365 | drm_device_set_unplugged(dev); | |
366 | ||
367 | if (dev->open_count == 0) { | |
368 | drm_put_dev(dev); | |
369 | } | |
370 | mutex_unlock(&drm_global_mutex); | |
371 | } | |
372 | EXPORT_SYMBOL(drm_unplug_dev); | |
1bb72532 | 373 | |
31bbe16f DH |
374 | /* |
375 | * DRM internal mount | |
376 | * We want to be able to allocate our own "struct address_space" to control | |
377 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
378 | * stand-alone address_space objects, so we need an underlying inode. As there | |
379 | * is no way to allocate an independent inode easily, we need a fake internal | |
380 | * VFS mount-point. | |
381 | * | |
382 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
383 | * frees it again. You are allowed to use iget() and iput() to get references to | |
384 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
385 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
386 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
387 | * between multiple inode-users. You could, technically, call | |
388 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
389 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
390 | */ | |
391 | ||
392 | static int drm_fs_cnt; | |
393 | static struct vfsmount *drm_fs_mnt; | |
394 | ||
395 | static const struct dentry_operations drm_fs_dops = { | |
396 | .d_dname = simple_dname, | |
397 | }; | |
398 | ||
399 | static const struct super_operations drm_fs_sops = { | |
400 | .statfs = simple_statfs, | |
401 | }; | |
402 | ||
403 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
404 | const char *dev_name, void *data) | |
405 | { | |
406 | return mount_pseudo(fs_type, | |
407 | "drm:", | |
408 | &drm_fs_sops, | |
409 | &drm_fs_dops, | |
410 | 0x010203ff); | |
411 | } | |
412 | ||
413 | static struct file_system_type drm_fs_type = { | |
414 | .name = "drm", | |
415 | .owner = THIS_MODULE, | |
416 | .mount = drm_fs_mount, | |
417 | .kill_sb = kill_anon_super, | |
418 | }; | |
419 | ||
420 | static struct inode *drm_fs_inode_new(void) | |
421 | { | |
422 | struct inode *inode; | |
423 | int r; | |
424 | ||
425 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
426 | if (r < 0) { | |
427 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
428 | return ERR_PTR(r); | |
429 | } | |
430 | ||
431 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
432 | if (IS_ERR(inode)) | |
433 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
434 | ||
435 | return inode; | |
436 | } | |
437 | ||
438 | static void drm_fs_inode_free(struct inode *inode) | |
439 | { | |
440 | if (inode) { | |
441 | iput(inode); | |
442 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
443 | } | |
444 | } | |
445 | ||
1bb72532 | 446 | /** |
b209aca3 CW |
447 | * drm_dev_init - Initialise new DRM device |
448 | * @dev: DRM device | |
449 | * @driver: DRM driver | |
1bb72532 DH |
450 | * @parent: Parent device object |
451 | * | |
b209aca3 | 452 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 453 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
454 | * with other core subsystems. This should be done last in the device |
455 | * initialization sequence to make sure userspace can't access an inconsistent | |
456 | * state. | |
1bb72532 | 457 | * |
099d1c29 DH |
458 | * The initial ref-count of the object is 1. Use drm_dev_ref() and |
459 | * drm_dev_unref() to take and drop further ref-counts. | |
460 | * | |
b0ff4b93 DV |
461 | * Note that for purely virtual devices @parent can be NULL. |
462 | * | |
b209aca3 | 463 | * Drivers that do not want to allocate their own device struct |
ea0dd85a DV |
464 | * embedding &struct drm_device can call drm_dev_alloc() instead. For drivers |
465 | * that do embed &struct drm_device it must be placed first in the overall | |
d82faafd DV |
466 | * structure, and the overall structure must be allocated using kmalloc(): The |
467 | * drm core's release function unconditionally calls kfree() on the @dev pointer | |
468 | * when the final reference is released. | |
b209aca3 | 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 | ||
6d6dfcfb | 503 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
504 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
505 | if (ret) | |
506 | goto err_minors; | |
507 | } | |
508 | ||
a3ccc461 | 509 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 DH |
510 | if (ret) |
511 | goto err_minors; | |
512 | ||
b209aca3 CW |
513 | ret = drm_ht_create(&dev->map_hash, 12); |
514 | if (ret) | |
05b701f6 | 515 | goto err_minors; |
1bb72532 | 516 | |
ba6976c1 | 517 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 518 | |
1bcecfac | 519 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
520 | ret = drm_gem_init(dev); |
521 | if (ret) { | |
522 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
523 | goto err_ctxbitmap; | |
524 | } | |
525 | } | |
526 | ||
5079c464 DV |
527 | /* Use the parent device name as DRM device unique identifier, but fall |
528 | * back to the driver name for virtual devices like vgem. */ | |
529 | ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name); | |
530 | if (ret) | |
531 | goto err_setunique; | |
e112e593 | 532 | |
b209aca3 | 533 | return 0; |
1bb72532 | 534 | |
e112e593 NI |
535 | err_setunique: |
536 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
537 | drm_gem_destroy(dev); | |
1bb72532 | 538 | err_ctxbitmap: |
e7b96070 | 539 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 540 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 541 | err_minors: |
a3ccc461 | 542 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 DH |
543 | drm_minor_free(dev, DRM_MINOR_RENDER); |
544 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
6796cb16 | 545 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 546 | err_free: |
c996fd0b | 547 | mutex_destroy(&dev->master_mutex); |
f92e1ee5 JL |
548 | mutex_destroy(&dev->ctxlist_mutex); |
549 | mutex_destroy(&dev->filelist_mutex); | |
550 | mutex_destroy(&dev->struct_mutex); | |
b209aca3 CW |
551 | return ret; |
552 | } | |
553 | EXPORT_SYMBOL(drm_dev_init); | |
554 | ||
555 | /** | |
556 | * drm_dev_alloc - Allocate new DRM device | |
557 | * @driver: DRM driver to allocate device for | |
558 | * @parent: Parent device object | |
559 | * | |
560 | * Allocate and initialize a new DRM device. No device registration is done. | |
561 | * Call drm_dev_register() to advertice the device to user space and register it | |
562 | * with other core subsystems. This should be done last in the device | |
563 | * initialization sequence to make sure userspace can't access an inconsistent | |
564 | * state. | |
565 | * | |
566 | * The initial ref-count of the object is 1. Use drm_dev_ref() and | |
567 | * drm_dev_unref() to take and drop further ref-counts. | |
568 | * | |
569 | * Note that for purely virtual devices @parent can be NULL. | |
570 | * | |
ea0dd85a | 571 | * Drivers that wish to subclass or embed &struct drm_device into their |
b209aca3 CW |
572 | * own struct should look at using drm_dev_init() instead. |
573 | * | |
574 | * RETURNS: | |
0f288605 | 575 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 CW |
576 | */ |
577 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
578 | struct device *parent) | |
579 | { | |
580 | struct drm_device *dev; | |
581 | int ret; | |
582 | ||
583 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
584 | if (!dev) | |
0f288605 | 585 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
586 | |
587 | ret = drm_dev_init(dev, driver, parent); | |
588 | if (ret) { | |
589 | kfree(dev); | |
0f288605 | 590 | return ERR_PTR(ret); |
b209aca3 CW |
591 | } |
592 | ||
593 | return dev; | |
1bb72532 DH |
594 | } |
595 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 596 | |
099d1c29 | 597 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 598 | { |
099d1c29 | 599 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 600 | |
e57e17cc LP |
601 | drm_vblank_cleanup(dev); |
602 | ||
1bcecfac | 603 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
0dc8fe59 DH |
604 | drm_gem_destroy(dev); |
605 | ||
e7b96070 | 606 | drm_legacy_ctxbitmap_cleanup(dev); |
0dc8fe59 | 607 | drm_ht_remove(&dev->map_hash); |
6796cb16 | 608 | drm_fs_inode_free(dev->anon_inode); |
0dc8fe59 | 609 | |
a3ccc461 | 610 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 DH |
611 | drm_minor_free(dev, DRM_MINOR_RENDER); |
612 | drm_minor_free(dev, DRM_MINOR_CONTROL); | |
613 | ||
c996fd0b | 614 | mutex_destroy(&dev->master_mutex); |
f92e1ee5 JL |
615 | mutex_destroy(&dev->ctxlist_mutex); |
616 | mutex_destroy(&dev->filelist_mutex); | |
617 | mutex_destroy(&dev->struct_mutex); | |
ca8e2ad7 | 618 | kfree(dev->unique); |
0dc8fe59 DH |
619 | kfree(dev); |
620 | } | |
099d1c29 DH |
621 | |
622 | /** | |
623 | * drm_dev_ref - Take reference of a DRM device | |
624 | * @dev: device to take reference of or NULL | |
625 | * | |
626 | * This increases the ref-count of @dev by one. You *must* already own a | |
627 | * reference when calling this. Use drm_dev_unref() to drop this reference | |
628 | * again. | |
629 | * | |
630 | * This function never fails. However, this function does not provide *any* | |
631 | * guarantee whether the device is alive or running. It only provides a | |
632 | * reference to the object and the memory associated with it. | |
633 | */ | |
634 | void drm_dev_ref(struct drm_device *dev) | |
635 | { | |
636 | if (dev) | |
637 | kref_get(&dev->ref); | |
638 | } | |
639 | EXPORT_SYMBOL(drm_dev_ref); | |
640 | ||
641 | /** | |
642 | * drm_dev_unref - Drop reference of a DRM device | |
643 | * @dev: device to drop reference of or NULL | |
644 | * | |
645 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
646 | * ref-count drops to zero. | |
647 | */ | |
648 | void drm_dev_unref(struct drm_device *dev) | |
649 | { | |
650 | if (dev) | |
651 | kref_put(&dev->ref, drm_dev_release); | |
652 | } | |
653 | EXPORT_SYMBOL(drm_dev_unref); | |
0dc8fe59 | 654 | |
6449b088 DV |
655 | static int create_compat_control_link(struct drm_device *dev) |
656 | { | |
657 | struct drm_minor *minor; | |
658 | char *name; | |
659 | int ret; | |
660 | ||
661 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
662 | return 0; | |
663 | ||
664 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
665 | if (!minor) | |
666 | return 0; | |
667 | ||
668 | /* | |
669 | * Some existing userspace out there uses the existing of the controlD* | |
670 | * sysfs files to figure out whether it's a modeset driver. It only does | |
671 | * readdir, hence a symlink is sufficient (and the least confusing | |
672 | * option). Otherwise controlD* is entirely unused. | |
673 | * | |
674 | * Old controlD chardev have been allocated in the range | |
675 | * 64-127. | |
676 | */ | |
677 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); | |
678 | if (!name) | |
679 | return -ENOMEM; | |
680 | ||
681 | ret = sysfs_create_link(minor->kdev->kobj.parent, | |
682 | &minor->kdev->kobj, | |
683 | name); | |
684 | ||
685 | kfree(name); | |
686 | ||
687 | return ret; | |
688 | } | |
689 | ||
690 | static void remove_compat_control_link(struct drm_device *dev) | |
691 | { | |
692 | struct drm_minor *minor; | |
693 | char *name; | |
694 | ||
695 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
696 | return; | |
697 | ||
698 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
699 | if (!minor) | |
700 | return; | |
701 | ||
702 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index); | |
703 | if (!name) | |
704 | return; | |
705 | ||
706 | sysfs_remove_link(minor->kdev->kobj.parent, name); | |
707 | ||
708 | kfree(name); | |
709 | } | |
710 | ||
c22f0ace DH |
711 | /** |
712 | * drm_dev_register - Register DRM device | |
713 | * @dev: Device to register | |
c6a1af8a | 714 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
715 | * |
716 | * Register the DRM device @dev with the system, advertise device to user-space | |
717 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
e28cd4d0 | 718 | * previously. |
c22f0ace DH |
719 | * |
720 | * Never call this twice on any device! | |
721 | * | |
6e3f797c | 722 | * NOTE: To ensure backward compatibility with existing drivers method this |
ef40cbf9 DV |
723 | * function calls the &drm_driver.load method after registering the device |
724 | * nodes, creating race conditions. Usage of the &drm_driver.load methods is | |
725 | * therefore deprecated, drivers must perform all initialization before calling | |
6e3f797c DV |
726 | * drm_dev_register(). |
727 | * | |
c22f0ace DH |
728 | * RETURNS: |
729 | * 0 on success, negative error code on failure. | |
730 | */ | |
731 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
732 | { | |
75f6dfe3 | 733 | struct drm_driver *driver = dev->driver; |
c22f0ace DH |
734 | int ret; |
735 | ||
736 | mutex_lock(&drm_global_mutex); | |
737 | ||
afcdbc86 | 738 | ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
05b701f6 DH |
739 | if (ret) |
740 | goto err_minors; | |
c22f0ace | 741 | |
afcdbc86 | 742 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
743 | if (ret) |
744 | goto err_minors; | |
c22f0ace | 745 | |
a3ccc461 | 746 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 747 | if (ret) |
05b701f6 | 748 | goto err_minors; |
c22f0ace | 749 | |
6449b088 DV |
750 | ret = create_compat_control_link(dev); |
751 | if (ret) | |
752 | goto err_minors; | |
753 | ||
c22f0ace DH |
754 | if (dev->driver->load) { |
755 | ret = dev->driver->load(dev, flags); | |
756 | if (ret) | |
05b701f6 | 757 | goto err_minors; |
c22f0ace DH |
758 | } |
759 | ||
bee7fb15 | 760 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 761 | drm_modeset_register_all(dev); |
e28cd4d0 | 762 | |
c22f0ace | 763 | ret = 0; |
75f6dfe3 GKB |
764 | |
765 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", | |
766 | driver->name, driver->major, driver->minor, | |
6098909c CW |
767 | driver->patchlevel, driver->date, |
768 | dev->dev ? dev_name(dev->dev) : "virtual device", | |
75f6dfe3 GKB |
769 | dev->primary->index); |
770 | ||
c22f0ace DH |
771 | goto out_unlock; |
772 | ||
05b701f6 | 773 | err_minors: |
6449b088 | 774 | remove_compat_control_link(dev); |
a3ccc461 | 775 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 DH |
776 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
777 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c22f0ace DH |
778 | out_unlock: |
779 | mutex_unlock(&drm_global_mutex); | |
780 | return ret; | |
781 | } | |
782 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
783 | |
784 | /** | |
785 | * drm_dev_unregister - Unregister DRM device | |
786 | * @dev: Device to unregister | |
787 | * | |
788 | * Unregister the DRM device from the system. This does the reverse of | |
789 | * drm_dev_register() but does not deallocate the device. The caller must call | |
099d1c29 | 790 | * drm_dev_unref() to drop their final reference. |
6e3f797c DV |
791 | * |
792 | * This should be called first in the device teardown code to make sure | |
793 | * userspace can't access the device instance any more. | |
c3a49737 DH |
794 | */ |
795 | void drm_dev_unregister(struct drm_device *dev) | |
796 | { | |
797 | struct drm_map_list *r_list, *list_temp; | |
798 | ||
799 | drm_lastclose(dev); | |
800 | ||
bee7fb15 | 801 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 802 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 803 | |
c3a49737 DH |
804 | if (dev->driver->unload) |
805 | dev->driver->unload(dev); | |
806 | ||
4efafebe DV |
807 | if (dev->agp) |
808 | drm_pci_agp_destroy(dev); | |
c3a49737 | 809 | |
c3a49737 | 810 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) |
9fc5cde7 | 811 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 812 | |
6449b088 | 813 | remove_compat_control_link(dev); |
a3ccc461 | 814 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 DH |
815 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
816 | drm_minor_unregister(dev, DRM_MINOR_CONTROL); | |
c3a49737 DH |
817 | } |
818 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 819 | |
a6b5fac5 GH |
820 | /** |
821 | * drm_dev_set_unique - Set the unique name of a DRM device | |
822 | * @dev: device of which to set the unique name | |
823 | * @name: unique name | |
824 | * | |
825 | * Sets the unique name of a DRM device using the specified string. Drivers | |
826 | * can use this at driver probe time if the unique name of the devices they | |
827 | * drive is static. | |
828 | * | |
829 | * Return: 0 on success or a negative error code on failure. | |
830 | */ | |
831 | int drm_dev_set_unique(struct drm_device *dev, const char *name) | |
832 | { | |
833 | kfree(dev->unique); | |
834 | dev->unique = kstrdup(name, GFP_KERNEL); | |
835 | ||
836 | return dev->unique ? 0 : -ENOMEM; | |
837 | } | |
838 | EXPORT_SYMBOL(drm_dev_set_unique); | |
839 | ||
1b7199fe DH |
840 | /* |
841 | * DRM Core | |
842 | * The DRM core module initializes all global DRM objects and makes them | |
843 | * available to drivers. Once setup, drivers can probe their respective | |
844 | * devices. | |
845 | * Currently, core management includes: | |
846 | * - The "DRM-Global" key/value database | |
847 | * - Global ID management for connectors | |
848 | * - DRM major number allocation | |
849 | * - DRM minor management | |
850 | * - DRM sysfs class | |
851 | * - DRM debugfs root | |
852 | * | |
853 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
854 | * interface registered on a DRM device, you can request minor numbers from DRM | |
855 | * core. DRM core takes care of major-number management and char-dev | |
856 | * registration. A stub ->open() callback forwards any open() requests to the | |
857 | * registered minor. | |
858 | */ | |
859 | ||
860 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
861 | { | |
862 | const struct file_operations *new_fops; | |
863 | struct drm_minor *minor; | |
864 | int err; | |
865 | ||
866 | DRM_DEBUG("\n"); | |
867 | ||
868 | mutex_lock(&drm_global_mutex); | |
869 | minor = drm_minor_acquire(iminor(inode)); | |
870 | if (IS_ERR(minor)) { | |
871 | err = PTR_ERR(minor); | |
872 | goto out_unlock; | |
873 | } | |
874 | ||
875 | new_fops = fops_get(minor->dev->driver->fops); | |
876 | if (!new_fops) { | |
877 | err = -ENODEV; | |
878 | goto out_release; | |
879 | } | |
880 | ||
881 | replace_fops(filp, new_fops); | |
882 | if (filp->f_op->open) | |
883 | err = filp->f_op->open(inode, filp); | |
884 | else | |
885 | err = 0; | |
886 | ||
887 | out_release: | |
888 | drm_minor_release(minor); | |
889 | out_unlock: | |
890 | mutex_unlock(&drm_global_mutex); | |
891 | return err; | |
892 | } | |
893 | ||
894 | static const struct file_operations drm_stub_fops = { | |
895 | .owner = THIS_MODULE, | |
896 | .open = drm_stub_open, | |
897 | .llseek = noop_llseek, | |
898 | }; | |
899 | ||
2cc107dc DH |
900 | static void drm_core_exit(void) |
901 | { | |
902 | unregister_chrdev(DRM_MAJOR, "drm"); | |
903 | debugfs_remove(drm_debugfs_root); | |
904 | drm_sysfs_destroy(); | |
905 | idr_destroy(&drm_minors_idr); | |
906 | drm_connector_ida_destroy(); | |
907 | drm_global_release(); | |
908 | } | |
909 | ||
1b7199fe DH |
910 | static int __init drm_core_init(void) |
911 | { | |
2cc107dc | 912 | int ret; |
1b7199fe DH |
913 | |
914 | drm_global_init(); | |
915 | drm_connector_ida_init(); | |
916 | idr_init(&drm_minors_idr); | |
917 | ||
fcc90213 DH |
918 | ret = drm_sysfs_init(); |
919 | if (ret < 0) { | |
2cc107dc DH |
920 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
921 | goto error; | |
1b7199fe DH |
922 | } |
923 | ||
924 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
925 | if (!drm_debugfs_root) { | |
2cc107dc DH |
926 | ret = -ENOMEM; |
927 | DRM_ERROR("Cannot create debugfs-root: %d\n", ret); | |
928 | goto error; | |
1b7199fe DH |
929 | } |
930 | ||
2cc107dc DH |
931 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
932 | if (ret < 0) | |
933 | goto error; | |
934 | ||
e82dfa00 | 935 | DRM_DEBUG("Initialized\n"); |
1b7199fe | 936 | return 0; |
1b7199fe | 937 | |
2cc107dc DH |
938 | error: |
939 | drm_core_exit(); | |
1b7199fe DH |
940 | return ret; |
941 | } | |
942 | ||
1b7199fe DH |
943 | module_init(drm_core_init); |
944 | module_exit(drm_core_exit); |