blob: 7dd6728dd092e23af63516295be42331bcc1f3c8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Thierry Redingc6a1af8a2014-05-19 13:39:07 +02007 * Author Rickard E. (Rik) Faith <faith@valinux.com>
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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
David Herrmann1b7199f2014-07-23 12:29:56 +020029#include <linux/debugfs.h>
David Herrmann31bbe162014-01-03 14:09:47 +010030#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/module.h>
32#include <linux/moduleparam.h>
David Herrmann31bbe162014-01-03 14:09:47 +010033#include <linux/mount.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
David Howells760285e2012-10-02 18:01:07 +010035#include <drm/drmP.h>
36#include <drm/drm_core.h>
David Herrmanne7b960702014-07-24 12:10:04 +020037#include "drm_legacy.h"
Daniel Vetter67d0ec42014-09-10 12:43:53 +020038#include "drm_internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Rob Clark02d0a492015-10-13 10:13:28 -040040unsigned int drm_debug = 0; /* bitmask of DRM_UT_x */
Linus Torvalds1da177e2005-04-16 15:20:36 -070041EXPORT_SYMBOL(drm_debug);
42
Dave Airlieb5e89ed2005-09-25 14:28:13 +100043MODULE_AUTHOR(CORE_AUTHOR);
44MODULE_DESCRIPTION(CORE_DESC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045MODULE_LICENSE("GPL and additional rights");
Linus Torvalds1da177e2005-04-16 15:20:36 -070046MODULE_PARM_DESC(debug, "Enable debug output");
Ville Syrjälä4ed0ce32014-08-06 14:49:53 +030047MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)");
Mario Kleiner27641c32010-10-23 04:20:23 +020048MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
Imre Deakc61eef72012-10-23 18:53:26 +000049MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Dave Jonesc0758142005-10-03 15:02:20 -040051module_param_named(debug, drm_debug, int, 0600);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
David Herrmann0d639882014-02-24 15:53:25 +010053static DEFINE_SPINLOCK(drm_minor_lock);
David Herrmann1b7199f2014-07-23 12:29:56 +020054static struct idr drm_minors_idr;
Dave Airlie2c14f282008-04-21 16:47:32 +100055
David Herrmann1b7199f2014-07-23 12:29:56 +020056static struct dentry *drm_debugfs_root;
Joe Perches5ad3d882011-04-17 20:35:51 -070057
Joe Perchesa1f1a792014-10-11 22:08:57 -070058void drm_err(const char *format, ...)
Joe Perches5ad3d882011-04-17 20:35:51 -070059{
60 struct va_format vaf;
61 va_list args;
Joe Perches5ad3d882011-04-17 20:35:51 -070062
63 va_start(args, format);
64
65 vaf.fmt = format;
66 vaf.va = &args;
67
Scott Wood2ee762b2015-03-11 22:13:50 -050068 printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
Joe Perchesa1f1a792014-10-11 22:08:57 -070069 __builtin_return_address(0), &vaf);
Joe Perches5ad3d882011-04-17 20:35:51 -070070
71 va_end(args);
Joe Perches5ad3d882011-04-17 20:35:51 -070072}
73EXPORT_SYMBOL(drm_err);
74
Lespiau, Damien1287aa92014-03-24 15:53:17 +000075void drm_ut_debug_printk(const char *function_name, const char *format, ...)
yakui_zhao4fefcb22009-06-02 14:09:47 +080076{
Daniel Vetterfffb9062013-11-17 22:25:02 +010077 struct va_format vaf;
yakui_zhao4fefcb22009-06-02 14:09:47 +080078 va_list args;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Lespiau, Damiena73d4e92014-03-24 15:53:15 +000080 va_start(args, format);
81 vaf.fmt = format;
82 vaf.va = &args;
Daniel Vetterfffb9062013-11-17 22:25:02 +010083
Lespiau, Damien0ed02982014-03-24 15:53:18 +000084 printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf);
Lespiau, Damiena73d4e92014-03-24 15:53:15 +000085
86 va_end(args);
yakui_zhao4fefcb22009-06-02 14:09:47 +080087}
88EXPORT_SYMBOL(drm_ut_debug_printk);
Joe Perches5ad3d882011-04-17 20:35:51 -070089
Dave Airlie7c1c2872008-11-28 14:22:24 +100090struct drm_master *drm_master_create(struct drm_minor *minor)
91{
92 struct drm_master *master;
93
Eric Anholt9a298b22009-03-24 12:23:04 -070094 master = kzalloc(sizeof(*master), GFP_KERNEL);
Dave Airlie7c1c2872008-11-28 14:22:24 +100095 if (!master)
96 return NULL;
97
98 kref_init(&master->refcount);
99 spin_lock_init(&master->lock.spinlock);
100 init_waitqueue_head(&master->lock.lock_queue);
David Herrmann32e7b942015-05-04 21:01:30 +0200101 idr_init(&master->magic_map);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000102 master->minor = minor;
103
Dave Airlie7c1c2872008-11-28 14:22:24 +1000104 return master;
105}
106
107struct drm_master *drm_master_get(struct drm_master *master)
108{
109 kref_get(&master->refcount);
110 return master;
111}
Thomas Hellstrom85bb0c32009-12-06 21:46:28 +0100112EXPORT_SYMBOL(drm_master_get);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000113
114static void drm_master_destroy(struct kref *kref)
115{
116 struct drm_master *master = container_of(kref, struct drm_master, refcount);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000117 struct drm_device *dev = master->minor->dev;
Dave Airliec1ff85d2009-01-19 17:17:58 +1000118 struct drm_map_list *r_list, *list_temp;
Dave Airlie7c1c2872008-11-28 14:22:24 +1000119
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100120 mutex_lock(&dev->struct_mutex);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000121 if (dev->driver->master_destroy)
122 dev->driver->master_destroy(dev, master);
123
Dave Airliec1ff85d2009-01-19 17:17:58 +1000124 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
125 if (r_list->master == master) {
David Herrmann9fc5cde2014-08-29 12:12:28 +0200126 drm_legacy_rmmap_locked(dev, r_list->map);
Dave Airliec1ff85d2009-01-19 17:17:58 +1000127 r_list = NULL;
128 }
129 }
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100130 mutex_unlock(&dev->struct_mutex);
David Herrmann32e7b942015-05-04 21:01:30 +0200131
132 idr_destroy(&master->magic_map);
David Herrmann4a324d32015-05-04 16:05:14 +0200133 kfree(master->unique);
Eric Anholt9a298b22009-03-24 12:23:04 -0700134 kfree(master);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000135}
136
137void drm_master_put(struct drm_master **master)
138{
139 kref_put(&(*master)->refcount, drm_master_destroy);
140 *master = NULL;
141}
Thomas Hellstrom85bb0c32009-12-06 21:46:28 +0100142EXPORT_SYMBOL(drm_master_put);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000143
144int drm_setmaster_ioctl(struct drm_device *dev, void *data,
145 struct drm_file *file_priv)
146{
Benjamin Gaignard53ef1602013-06-26 17:58:59 +0200147 int ret = 0;
Thomas Hellstrom862302f2009-12-02 18:15:25 +0000148
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100149 mutex_lock(&dev->master_mutex);
Dave Airlie7963e9d2014-08-08 07:30:53 +1000150 if (file_priv->is_master)
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100151 goto out_unlock;
Jonas Bonn6b008422009-04-16 09:00:02 +0200152
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100153 if (file_priv->minor->master) {
154 ret = -EINVAL;
155 goto out_unlock;
156 }
Dave Airlie7c1c2872008-11-28 14:22:24 +1000157
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100158 if (!file_priv->master) {
159 ret = -EINVAL;
160 goto out_unlock;
161 }
Dave Airlie7c1c2872008-11-28 14:22:24 +1000162
Thomas Hellstroma0af2e52015-12-02 09:24:46 -0800163 if (!file_priv->allowed_master) {
164 ret = drm_new_set_master(dev, file_priv);
165 goto out_unlock;
166 }
167
David Herrmann08bec5b2012-11-15 13:04:37 +0000168 file_priv->minor->master = drm_master_get(file_priv->master);
Dave Airlie7963e9d2014-08-08 07:30:53 +1000169 file_priv->is_master = 1;
David Herrmann08bec5b2012-11-15 13:04:37 +0000170 if (dev->driver->master_set) {
171 ret = dev->driver->master_set(dev, file_priv, false);
Dave Airlie7963e9d2014-08-08 07:30:53 +1000172 if (unlikely(ret != 0)) {
173 file_priv->is_master = 0;
David Herrmann08bec5b2012-11-15 13:04:37 +0000174 drm_master_put(&file_priv->minor->master);
Dave Airlie7963e9d2014-08-08 07:30:53 +1000175 }
Dave Airlie7c1c2872008-11-28 14:22:24 +1000176 }
177
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100178out_unlock:
179 mutex_unlock(&dev->master_mutex);
Benjamin Gaignard53ef1602013-06-26 17:58:59 +0200180 return ret;
Dave Airlie7c1c2872008-11-28 14:22:24 +1000181}
182
183int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
184 struct drm_file *file_priv)
185{
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100186 int ret = -EINVAL;
187
188 mutex_lock(&dev->master_mutex);
Dave Airlie7963e9d2014-08-08 07:30:53 +1000189 if (!file_priv->is_master)
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100190 goto out_unlock;
Jonas Bonn6b008422009-04-16 09:00:02 +0200191
Dave Airlie07f1c7a2009-04-20 09:32:50 +1000192 if (!file_priv->minor->master)
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100193 goto out_unlock;
Dave Airlie07f1c7a2009-04-20 09:32:50 +1000194
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100195 ret = 0;
Thomas Hellstrom862302f2009-12-02 18:15:25 +0000196 if (dev->driver->master_drop)
197 dev->driver->master_drop(dev, file_priv, false);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000198 drm_master_put(&file_priv->minor->master);
Dave Airlie7963e9d2014-08-08 07:30:53 +1000199 file_priv->is_master = 0;
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100200
201out_unlock:
202 mutex_unlock(&dev->master_mutex);
203 return ret;
Dave Airlie7c1c2872008-11-28 14:22:24 +1000204}
205
David Herrmann0d639882014-02-24 15:53:25 +0100206/*
207 * DRM Minors
208 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
209 * of them is represented by a drm_minor object. Depending on the capabilities
210 * of the device-driver, different interfaces are registered.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 *
David Herrmann0d639882014-02-24 15:53:25 +0100212 * Minors can be accessed via dev->$minor_name. This pointer is either
213 * NULL or a valid drm_minor pointer and stays valid as long as the device is
214 * valid. This means, DRM minors have the same life-time as the underlying
215 * device. However, this doesn't mean that the minor is active. Minors are
216 * registered and unregistered dynamically according to device-state.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 */
David Herrmann0d639882014-02-24 15:53:25 +0100218
David Herrmann05b701f2014-01-29 12:43:56 +0100219static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
220 unsigned int type)
221{
222 switch (type) {
223 case DRM_MINOR_LEGACY:
224 return &dev->primary;
225 case DRM_MINOR_RENDER:
226 return &dev->render;
227 case DRM_MINOR_CONTROL:
228 return &dev->control;
229 default:
230 return NULL;
231 }
232}
233
234static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
235{
236 struct drm_minor *minor;
David Herrmannf1b85962014-07-23 10:34:52 +0200237 unsigned long flags;
238 int r;
David Herrmann05b701f2014-01-29 12:43:56 +0100239
240 minor = kzalloc(sizeof(*minor), GFP_KERNEL);
241 if (!minor)
242 return -ENOMEM;
243
244 minor->type = type;
245 minor->dev = dev;
David Herrmann05b701f2014-01-29 12:43:56 +0100246
David Herrmannf1b85962014-07-23 10:34:52 +0200247 idr_preload(GFP_KERNEL);
248 spin_lock_irqsave(&drm_minor_lock, flags);
249 r = idr_alloc(&drm_minors_idr,
250 NULL,
251 64 * type,
252 64 * (type + 1),
253 GFP_NOWAIT);
254 spin_unlock_irqrestore(&drm_minor_lock, flags);
255 idr_preload_end();
256
257 if (r < 0)
258 goto err_free;
259
260 minor->index = r;
261
David Herrmanne1728072014-07-23 11:38:38 +0200262 minor->kdev = drm_sysfs_minor_alloc(minor);
263 if (IS_ERR(minor->kdev)) {
264 r = PTR_ERR(minor->kdev);
265 goto err_index;
266 }
267
David Herrmann05b701f2014-01-29 12:43:56 +0100268 *drm_minor_get_slot(dev, type) = minor;
269 return 0;
David Herrmannf1b85962014-07-23 10:34:52 +0200270
David Herrmanne1728072014-07-23 11:38:38 +0200271err_index:
272 spin_lock_irqsave(&drm_minor_lock, flags);
273 idr_remove(&drm_minors_idr, minor->index);
274 spin_unlock_irqrestore(&drm_minor_lock, flags);
David Herrmannf1b85962014-07-23 10:34:52 +0200275err_free:
276 kfree(minor);
277 return r;
David Herrmann05b701f2014-01-29 12:43:56 +0100278}
279
David Herrmannbd9dfa92014-01-29 12:55:48 +0100280static void drm_minor_free(struct drm_device *dev, unsigned int type)
281{
David Herrmannf1b85962014-07-23 10:34:52 +0200282 struct drm_minor **slot, *minor;
283 unsigned long flags;
David Herrmannbd9dfa92014-01-29 12:55:48 +0100284
285 slot = drm_minor_get_slot(dev, type);
David Herrmannf1b85962014-07-23 10:34:52 +0200286 minor = *slot;
287 if (!minor)
288 return;
289
David Herrmanne1728072014-07-23 11:38:38 +0200290 put_device(minor->kdev);
David Herrmannf1b85962014-07-23 10:34:52 +0200291
292 spin_lock_irqsave(&drm_minor_lock, flags);
293 idr_remove(&drm_minors_idr, minor->index);
294 spin_unlock_irqrestore(&drm_minor_lock, flags);
295
296 kfree(minor);
297 *slot = NULL;
David Herrmannbd9dfa92014-01-29 12:55:48 +0100298}
299
David Herrmannafcdbc82014-01-29 12:57:05 +0100300static int drm_minor_register(struct drm_device *dev, unsigned int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
David Herrmannf1b85962014-07-23 10:34:52 +0200302 struct drm_minor *minor;
David Herrmann0d639882014-02-24 15:53:25 +0100303 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306 DRM_DEBUG("\n");
307
David Herrmannf1b85962014-07-23 10:34:52 +0200308 minor = *drm_minor_get_slot(dev, type);
309 if (!minor)
David Herrmann05b701f2014-01-29 12:43:56 +0100310 return 0;
311
David Herrmannf1b85962014-07-23 10:34:52 +0200312 ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
Ben Gamari955b12d2009-02-17 20:08:49 -0500313 if (ret) {
GeunSik Lim156f5a72009-06-02 15:01:37 +0900314 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
David Herrmannf1b85962014-07-23 10:34:52 +0200315 return ret;
Ben Gamari955b12d2009-02-17 20:08:49 -0500316 }
Dave Airlie2c14f282008-04-21 16:47:32 +1000317
David Herrmanne1728072014-07-23 11:38:38 +0200318 ret = device_add(minor->kdev);
319 if (ret)
Daniel Vettercb6458f2013-08-08 15:41:34 +0200320 goto err_debugfs;
Dave Airlie2c14f282008-04-21 16:47:32 +1000321
David Herrmann0d639882014-02-24 15:53:25 +0100322 /* replace NULL with @minor so lookups will succeed from now on */
323 spin_lock_irqsave(&drm_minor_lock, flags);
David Herrmannf1b85962014-07-23 10:34:52 +0200324 idr_replace(&drm_minors_idr, minor, minor->index);
David Herrmann0d639882014-02-24 15:53:25 +0100325 spin_unlock_irqrestore(&drm_minor_lock, flags);
Dave Airlie2c14f282008-04-21 16:47:32 +1000326
David Herrmannf1b85962014-07-23 10:34:52 +0200327 DRM_DEBUG("new minor registered %d\n", minor->index);
Dave Airlie2c14f282008-04-21 16:47:32 +1000328 return 0;
329
Daniel Vettercb6458f2013-08-08 15:41:34 +0200330err_debugfs:
David Herrmannf1b85962014-07-23 10:34:52 +0200331 drm_debugfs_cleanup(minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return ret;
333}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000334
David Herrmannafcdbc82014-01-29 12:57:05 +0100335static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
David Herrmannf73aca52013-10-20 18:55:40 +0200336{
David Herrmannafcdbc82014-01-29 12:57:05 +0100337 struct drm_minor *minor;
David Herrmann0d639882014-02-24 15:53:25 +0100338 unsigned long flags;
David Herrmannafcdbc82014-01-29 12:57:05 +0100339
340 minor = *drm_minor_get_slot(dev, type);
David Herrmanne1728072014-07-23 11:38:38 +0200341 if (!minor || !device_is_registered(minor->kdev))
David Herrmannf73aca52013-10-20 18:55:40 +0200342 return;
343
David Herrmannf1b85962014-07-23 10:34:52 +0200344 /* replace @minor with NULL so lookups will fail from now on */
David Herrmann0d639882014-02-24 15:53:25 +0100345 spin_lock_irqsave(&drm_minor_lock, flags);
David Herrmannf1b85962014-07-23 10:34:52 +0200346 idr_replace(&drm_minors_idr, NULL, minor->index);
David Herrmann0d639882014-02-24 15:53:25 +0100347 spin_unlock_irqrestore(&drm_minor_lock, flags);
David Herrmann0d639882014-02-24 15:53:25 +0100348
David Herrmanne1728072014-07-23 11:38:38 +0200349 device_del(minor->kdev);
350 dev_set_drvdata(minor->kdev, NULL); /* safety belt */
David Herrmann865fb472013-10-20 18:55:43 +0200351 drm_debugfs_cleanup(minor);
David Herrmannf73aca52013-10-20 18:55:40 +0200352}
353
354/**
David Herrmann1616c522014-01-29 10:49:19 +0100355 * drm_minor_acquire - Acquire a DRM minor
356 * @minor_id: Minor ID of the DRM-minor
David Herrmannf73aca52013-10-20 18:55:40 +0200357 *
David Herrmann1616c522014-01-29 10:49:19 +0100358 * Looks up the given minor-ID and returns the respective DRM-minor object. The
359 * refence-count of the underlying device is increased so you must release this
360 * object with drm_minor_release().
361 *
362 * As long as you hold this minor, it is guaranteed that the object and the
363 * minor->dev pointer will stay valid! However, the device may get unplugged and
364 * unregistered while you hold the minor.
365 *
366 * Returns:
367 * Pointer to minor-object with increased device-refcount, or PTR_ERR on
368 * failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 */
David Herrmann1616c522014-01-29 10:49:19 +0100370struct drm_minor *drm_minor_acquire(unsigned int minor_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
David Herrmann1616c522014-01-29 10:49:19 +0100372 struct drm_minor *minor;
David Herrmann0d639882014-02-24 15:53:25 +0100373 unsigned long flags;
Eric Anholt673a3942008-07-30 12:06:12 -0700374
David Herrmann0d639882014-02-24 15:53:25 +0100375 spin_lock_irqsave(&drm_minor_lock, flags);
David Herrmann1616c522014-01-29 10:49:19 +0100376 minor = idr_find(&drm_minors_idr, minor_id);
David Herrmann0d639882014-02-24 15:53:25 +0100377 if (minor)
378 drm_dev_ref(minor->dev);
379 spin_unlock_irqrestore(&drm_minor_lock, flags);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000380
David Herrmann0d639882014-02-24 15:53:25 +0100381 if (!minor) {
382 return ERR_PTR(-ENODEV);
383 } else if (drm_device_is_unplugged(minor->dev)) {
384 drm_dev_unref(minor->dev);
385 return ERR_PTR(-ENODEV);
386 }
387
David Herrmann1616c522014-01-29 10:49:19 +0100388 return minor;
389}
390
391/**
392 * drm_minor_release - Release DRM minor
393 * @minor: Pointer to DRM minor object
394 *
395 * Release a minor that was previously acquired via drm_minor_acquire().
396 */
397void drm_minor_release(struct drm_minor *minor)
398{
399 drm_dev_unref(minor->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
Kristian Høgsberg112b7152009-01-04 16:55:33 -0500401
402/**
Daniel Vetter6e3f7972015-09-28 21:46:35 +0200403 * DOC: driver instance overview
404 *
405 * A device instance for a drm driver is represented by struct &drm_device. This
406 * is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
407 * callbacks implemented by the driver. The driver then needs to initialize all
408 * the various subsystems for the drm device like memory management, vblank
409 * handling, modesetting support and intial output configuration plus obviously
410 * initialize all the corresponding hardware bits. An important part of this is
411 * also calling drm_dev_set_unique() to set the userspace-visible unique name of
412 * this device instance. Finally when everything is up and running and ready for
413 * userspace the device instance can be published using drm_dev_register().
414 *
415 * There is also deprecated support for initalizing device instances using
416 * bus-specific helpers and the ->load() callback. But due to
417 * backwards-compatibility needs the device instance have to be published too
418 * early, which requires unpretty global locking to make safe and is therefore
419 * only support for existing drivers not yet converted to the new scheme.
420 *
421 * When cleaning up a device instance everything needs to be done in reverse:
422 * First unpublish the device instance with drm_dev_unregister(). Then clean up
423 * any other resources allocated at device initialization and drop the driver's
424 * reference to &drm_device using drm_dev_unref().
425 *
426 * Note that the lifetime rules for &drm_device instance has still a lot of
427 * historical baggage. Hence use the reference counting provided by
428 * drm_dev_ref() and drm_dev_unref() only carefully.
429 *
430 * Also note that embedding of &drm_device is currently not (yet) supported (but
431 * it would be easy to add). Drivers can store driver-private data in the
432 * dev_priv field of &drm_device.
433 */
434
435/**
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200436 * drm_put_dev - Unregister and release a DRM device
437 * @dev: DRM device
438 *
439 * Called at module unload time or when a PCI device is unplugged.
440 *
Kristian Høgsberg112b7152009-01-04 16:55:33 -0500441 * Cleans up all DRM device, calling drm_lastclose().
Daniel Vetter6e3f7972015-09-28 21:46:35 +0200442 *
443 * Note: Use of this function is deprecated. It will eventually go away
444 * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
445 * instead to make sure that the device isn't userspace accessible any more
446 * while teardown is in progress, ensuring that userspace can't access an
447 * inconsistent state.
Kristian Høgsberg112b7152009-01-04 16:55:33 -0500448 */
449void drm_put_dev(struct drm_device *dev)
450{
Kristian Høgsberg112b7152009-01-04 16:55:33 -0500451 DRM_DEBUG("\n");
452
453 if (!dev) {
454 DRM_ERROR("cleanup called no dev\n");
455 return;
456 }
457
David Herrmannc3a49732013-10-02 11:23:38 +0200458 drm_dev_unregister(dev);
David Herrmann099d1c22014-01-29 10:21:36 +0100459 drm_dev_unref(dev);
Kristian Høgsberg112b7152009-01-04 16:55:33 -0500460}
461EXPORT_SYMBOL(drm_put_dev);
Dave Airlie2c07a212012-02-20 14:18:07 +0000462
463void drm_unplug_dev(struct drm_device *dev)
464{
465 /* for a USB device */
David Herrmannafcdbc82014-01-29 12:57:05 +0100466 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
467 drm_minor_unregister(dev, DRM_MINOR_RENDER);
468 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
Dave Airlie2c07a212012-02-20 14:18:07 +0000469
470 mutex_lock(&drm_global_mutex);
471
472 drm_device_set_unplugged(dev);
473
474 if (dev->open_count == 0) {
475 drm_put_dev(dev);
476 }
477 mutex_unlock(&drm_global_mutex);
478}
479EXPORT_SYMBOL(drm_unplug_dev);
David Herrmann1bb72532013-10-02 11:23:34 +0200480
David Herrmann31bbe162014-01-03 14:09:47 +0100481/*
482 * DRM internal mount
483 * We want to be able to allocate our own "struct address_space" to control
484 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
485 * stand-alone address_space objects, so we need an underlying inode. As there
486 * is no way to allocate an independent inode easily, we need a fake internal
487 * VFS mount-point.
488 *
489 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
490 * frees it again. You are allowed to use iget() and iput() to get references to
491 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
492 * drm_fs_inode_free() call (which does not have to be the last iput()).
493 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
494 * between multiple inode-users. You could, technically, call
495 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
496 * iput(), but this way you'd end up with a new vfsmount for each inode.
497 */
498
499static int drm_fs_cnt;
500static struct vfsmount *drm_fs_mnt;
501
502static const struct dentry_operations drm_fs_dops = {
503 .d_dname = simple_dname,
504};
505
506static const struct super_operations drm_fs_sops = {
507 .statfs = simple_statfs,
508};
509
510static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
511 const char *dev_name, void *data)
512{
513 return mount_pseudo(fs_type,
514 "drm:",
515 &drm_fs_sops,
516 &drm_fs_dops,
517 0x010203ff);
518}
519
520static struct file_system_type drm_fs_type = {
521 .name = "drm",
522 .owner = THIS_MODULE,
523 .mount = drm_fs_mount,
524 .kill_sb = kill_anon_super,
525};
526
527static struct inode *drm_fs_inode_new(void)
528{
529 struct inode *inode;
530 int r;
531
532 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
533 if (r < 0) {
534 DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
535 return ERR_PTR(r);
536 }
537
538 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
539 if (IS_ERR(inode))
540 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
541
542 return inode;
543}
544
545static void drm_fs_inode_free(struct inode *inode)
546{
547 if (inode) {
548 iput(inode);
549 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
550 }
551}
552
David Herrmann1bb72532013-10-02 11:23:34 +0200553/**
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200554 * drm_dev_alloc - Allocate new DRM device
David Herrmann1bb72532013-10-02 11:23:34 +0200555 * @driver: DRM driver to allocate device for
556 * @parent: Parent device object
557 *
558 * Allocate and initialize a new DRM device. No device registration is done.
David Herrmannc22f0ac2013-10-02 11:23:35 +0200559 * Call drm_dev_register() to advertice the device to user space and register it
Daniel Vetter6e3f7972015-09-28 21:46:35 +0200560 * with other core subsystems. This should be done last in the device
561 * initialization sequence to make sure userspace can't access an inconsistent
562 * state.
David Herrmann1bb72532013-10-02 11:23:34 +0200563 *
David Herrmann099d1c22014-01-29 10:21:36 +0100564 * The initial ref-count of the object is 1. Use drm_dev_ref() and
565 * drm_dev_unref() to take and drop further ref-counts.
566 *
Daniel Vetterb0ff4b92014-11-24 20:01:58 +0100567 * Note that for purely virtual devices @parent can be NULL.
568 *
David Herrmann1bb72532013-10-02 11:23:34 +0200569 * RETURNS:
570 * Pointer to new DRM device, or NULL if out of memory.
571 */
572struct drm_device *drm_dev_alloc(struct drm_driver *driver,
573 struct device *parent)
574{
575 struct drm_device *dev;
576 int ret;
577
578 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
579 if (!dev)
580 return NULL;
581
David Herrmann099d1c22014-01-29 10:21:36 +0100582 kref_init(&dev->ref);
David Herrmann1bb72532013-10-02 11:23:34 +0200583 dev->dev = parent;
584 dev->driver = driver;
585
586 INIT_LIST_HEAD(&dev->filelist);
587 INIT_LIST_HEAD(&dev->ctxlist);
588 INIT_LIST_HEAD(&dev->vmalist);
589 INIT_LIST_HEAD(&dev->maplist);
590 INIT_LIST_HEAD(&dev->vblank_event_list);
591
Daniel Vetter2177a212013-12-16 11:21:06 +0100592 spin_lock_init(&dev->buf_lock);
David Herrmann1bb72532013-10-02 11:23:34 +0200593 spin_lock_init(&dev->event_lock);
594 mutex_init(&dev->struct_mutex);
595 mutex_init(&dev->ctxlist_mutex);
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100596 mutex_init(&dev->master_mutex);
David Herrmann1bb72532013-10-02 11:23:34 +0200597
David Herrmann6796cb12014-01-03 14:24:19 +0100598 dev->anon_inode = drm_fs_inode_new();
599 if (IS_ERR(dev->anon_inode)) {
600 ret = PTR_ERR(dev->anon_inode);
601 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
David Herrmann1bb72532013-10-02 11:23:34 +0200602 goto err_free;
David Herrmann6796cb12014-01-03 14:24:19 +0100603 }
604
David Herrmann05b701f2014-01-29 12:43:56 +0100605 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
606 ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL);
607 if (ret)
608 goto err_minors;
Gustavo Padovanbcfe0c02015-08-13 17:06:39 -0300609
610 WARN_ON(driver->suspend || driver->resume);
David Herrmann05b701f2014-01-29 12:43:56 +0100611 }
612
David Herrmann6d6dfcf2014-03-16 14:38:40 +0100613 if (drm_core_check_feature(dev, DRIVER_RENDER)) {
David Herrmann05b701f2014-01-29 12:43:56 +0100614 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
615 if (ret)
616 goto err_minors;
617 }
618
619 ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY);
620 if (ret)
621 goto err_minors;
622
David Herrmann6796cb12014-01-03 14:24:19 +0100623 if (drm_ht_create(&dev->map_hash, 12))
David Herrmann05b701f2014-01-29 12:43:56 +0100624 goto err_minors;
David Herrmann1bb72532013-10-02 11:23:34 +0200625
Daniel Vetterba6976c2015-06-23 11:22:36 +0200626 drm_legacy_ctxbitmap_init(dev);
David Herrmann1bb72532013-10-02 11:23:34 +0200627
Andrzej Hajda1bcecfa2014-09-30 16:49:56 +0200628 if (drm_core_check_feature(dev, DRIVER_GEM)) {
David Herrmann1bb72532013-10-02 11:23:34 +0200629 ret = drm_gem_init(dev);
630 if (ret) {
631 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
632 goto err_ctxbitmap;
633 }
634 }
635
636 return dev;
637
638err_ctxbitmap:
David Herrmanne7b960702014-07-24 12:10:04 +0200639 drm_legacy_ctxbitmap_cleanup(dev);
David Herrmann1bb72532013-10-02 11:23:34 +0200640 drm_ht_remove(&dev->map_hash);
David Herrmann05b701f2014-01-29 12:43:56 +0100641err_minors:
David Herrmannbd9dfa92014-01-29 12:55:48 +0100642 drm_minor_free(dev, DRM_MINOR_LEGACY);
643 drm_minor_free(dev, DRM_MINOR_RENDER);
644 drm_minor_free(dev, DRM_MINOR_CONTROL);
David Herrmann6796cb12014-01-03 14:24:19 +0100645 drm_fs_inode_free(dev->anon_inode);
David Herrmann1bb72532013-10-02 11:23:34 +0200646err_free:
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100647 mutex_destroy(&dev->master_mutex);
David Herrmann1bb72532013-10-02 11:23:34 +0200648 kfree(dev);
649 return NULL;
650}
651EXPORT_SYMBOL(drm_dev_alloc);
David Herrmannc22f0ac2013-10-02 11:23:35 +0200652
David Herrmann099d1c22014-01-29 10:21:36 +0100653static void drm_dev_release(struct kref *ref)
David Herrmann0dc8fe52013-10-02 11:23:37 +0200654{
David Herrmann099d1c22014-01-29 10:21:36 +0100655 struct drm_device *dev = container_of(ref, struct drm_device, ref);
David Herrmann8f6599d2013-10-20 18:55:45 +0200656
Andrzej Hajda1bcecfa2014-09-30 16:49:56 +0200657 if (drm_core_check_feature(dev, DRIVER_GEM))
David Herrmann0dc8fe52013-10-02 11:23:37 +0200658 drm_gem_destroy(dev);
659
David Herrmanne7b960702014-07-24 12:10:04 +0200660 drm_legacy_ctxbitmap_cleanup(dev);
David Herrmann0dc8fe52013-10-02 11:23:37 +0200661 drm_ht_remove(&dev->map_hash);
David Herrmann6796cb12014-01-03 14:24:19 +0100662 drm_fs_inode_free(dev->anon_inode);
David Herrmann0dc8fe52013-10-02 11:23:37 +0200663
David Herrmannbd9dfa92014-01-29 12:55:48 +0100664 drm_minor_free(dev, DRM_MINOR_LEGACY);
665 drm_minor_free(dev, DRM_MINOR_RENDER);
666 drm_minor_free(dev, DRM_MINOR_CONTROL);
667
Thomas Hellstromc996fd02014-02-25 19:57:44 +0100668 mutex_destroy(&dev->master_mutex);
Thierry Redingca8e2ad2014-04-11 15:23:00 +0200669 kfree(dev->unique);
David Herrmann0dc8fe52013-10-02 11:23:37 +0200670 kfree(dev);
671}
David Herrmann099d1c22014-01-29 10:21:36 +0100672
673/**
674 * drm_dev_ref - Take reference of a DRM device
675 * @dev: device to take reference of or NULL
676 *
677 * This increases the ref-count of @dev by one. You *must* already own a
678 * reference when calling this. Use drm_dev_unref() to drop this reference
679 * again.
680 *
681 * This function never fails. However, this function does not provide *any*
682 * guarantee whether the device is alive or running. It only provides a
683 * reference to the object and the memory associated with it.
684 */
685void drm_dev_ref(struct drm_device *dev)
686{
687 if (dev)
688 kref_get(&dev->ref);
689}
690EXPORT_SYMBOL(drm_dev_ref);
691
692/**
693 * drm_dev_unref - Drop reference of a DRM device
694 * @dev: device to drop reference of or NULL
695 *
696 * This decreases the ref-count of @dev by one. The device is destroyed if the
697 * ref-count drops to zero.
698 */
699void drm_dev_unref(struct drm_device *dev)
700{
701 if (dev)
702 kref_put(&dev->ref, drm_dev_release);
703}
704EXPORT_SYMBOL(drm_dev_unref);
David Herrmann0dc8fe52013-10-02 11:23:37 +0200705
706/**
David Herrmannc22f0ac2013-10-02 11:23:35 +0200707 * drm_dev_register - Register DRM device
708 * @dev: Device to register
Thierry Redingc6a1af8a2014-05-19 13:39:07 +0200709 * @flags: Flags passed to the driver's .load() function
David Herrmannc22f0ac2013-10-02 11:23:35 +0200710 *
711 * Register the DRM device @dev with the system, advertise device to user-space
712 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
713 * previously.
714 *
715 * Never call this twice on any device!
716 *
Daniel Vetter6e3f7972015-09-28 21:46:35 +0200717 * NOTE: To ensure backward compatibility with existing drivers method this
718 * function calls the ->load() method after registering the device nodes,
719 * creating race conditions. Usage of the ->load() methods is therefore
720 * deprecated, drivers must perform all initialization before calling
721 * drm_dev_register().
722 *
David Herrmannc22f0ac2013-10-02 11:23:35 +0200723 * RETURNS:
724 * 0 on success, negative error code on failure.
725 */
726int drm_dev_register(struct drm_device *dev, unsigned long flags)
727{
728 int ret;
729
730 mutex_lock(&drm_global_mutex);
731
David Herrmannafcdbc82014-01-29 12:57:05 +0100732 ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
David Herrmannc22f0ac2013-10-02 11:23:35 +0200733 if (ret)
David Herrmann05b701f2014-01-29 12:43:56 +0100734 goto err_minors;
735
David Herrmannafcdbc82014-01-29 12:57:05 +0100736 ret = drm_minor_register(dev, DRM_MINOR_RENDER);
David Herrmann05b701f2014-01-29 12:43:56 +0100737 if (ret)
738 goto err_minors;
739
David Herrmannafcdbc82014-01-29 12:57:05 +0100740 ret = drm_minor_register(dev, DRM_MINOR_LEGACY);
David Herrmann05b701f2014-01-29 12:43:56 +0100741 if (ret)
742 goto err_minors;
David Herrmannc22f0ac2013-10-02 11:23:35 +0200743
744 if (dev->driver->load) {
745 ret = dev->driver->load(dev, flags);
746 if (ret)
David Herrmann05b701f2014-01-29 12:43:56 +0100747 goto err_minors;
David Herrmannc22f0ac2013-10-02 11:23:35 +0200748 }
749
David Herrmannc22f0ac2013-10-02 11:23:35 +0200750 ret = 0;
751 goto out_unlock;
752
David Herrmann05b701f2014-01-29 12:43:56 +0100753err_minors:
David Herrmannafcdbc82014-01-29 12:57:05 +0100754 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
755 drm_minor_unregister(dev, DRM_MINOR_RENDER);
756 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
David Herrmannc22f0ac2013-10-02 11:23:35 +0200757out_unlock:
758 mutex_unlock(&drm_global_mutex);
759 return ret;
760}
761EXPORT_SYMBOL(drm_dev_register);
David Herrmannc3a49732013-10-02 11:23:38 +0200762
763/**
764 * drm_dev_unregister - Unregister DRM device
765 * @dev: Device to unregister
766 *
767 * Unregister the DRM device from the system. This does the reverse of
768 * drm_dev_register() but does not deallocate the device. The caller must call
David Herrmann099d1c22014-01-29 10:21:36 +0100769 * drm_dev_unref() to drop their final reference.
Daniel Vetter6e3f7972015-09-28 21:46:35 +0200770 *
771 * This should be called first in the device teardown code to make sure
772 * userspace can't access the device instance any more.
David Herrmannc3a49732013-10-02 11:23:38 +0200773 */
774void drm_dev_unregister(struct drm_device *dev)
775{
776 struct drm_map_list *r_list, *list_temp;
777
778 drm_lastclose(dev);
779
780 if (dev->driver->unload)
781 dev->driver->unload(dev);
782
Daniel Vetter4efafeb2013-12-11 11:34:38 +0100783 if (dev->agp)
784 drm_pci_agp_destroy(dev);
David Herrmannc3a49732013-10-02 11:23:38 +0200785
786 drm_vblank_cleanup(dev);
787
788 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
David Herrmann9fc5cde2014-08-29 12:12:28 +0200789 drm_legacy_rmmap(dev, r_list->map);
David Herrmannc3a49732013-10-02 11:23:38 +0200790
David Herrmannafcdbc82014-01-29 12:57:05 +0100791 drm_minor_unregister(dev, DRM_MINOR_LEGACY);
792 drm_minor_unregister(dev, DRM_MINOR_RENDER);
793 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
David Herrmannc3a49732013-10-02 11:23:38 +0200794}
795EXPORT_SYMBOL(drm_dev_unregister);
Thierry Redingca8e2ad2014-04-11 15:23:00 +0200796
797/**
798 * drm_dev_set_unique - Set the unique name of a DRM device
799 * @dev: device of which to set the unique name
800 * @fmt: format string for unique name
801 *
802 * Sets the unique name of a DRM device using the specified format string and
803 * a variable list of arguments. Drivers can use this at driver probe time if
804 * the unique name of the devices they drive is static.
805 *
806 * Return: 0 on success or a negative error code on failure.
807 */
808int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...)
809{
810 va_list ap;
811
812 kfree(dev->unique);
813
814 va_start(ap, fmt);
815 dev->unique = kvasprintf(GFP_KERNEL, fmt, ap);
816 va_end(ap);
817
818 return dev->unique ? 0 : -ENOMEM;
819}
820EXPORT_SYMBOL(drm_dev_set_unique);
David Herrmann1b7199f2014-07-23 12:29:56 +0200821
822/*
823 * DRM Core
824 * The DRM core module initializes all global DRM objects and makes them
825 * available to drivers. Once setup, drivers can probe their respective
826 * devices.
827 * Currently, core management includes:
828 * - The "DRM-Global" key/value database
829 * - Global ID management for connectors
830 * - DRM major number allocation
831 * - DRM minor management
832 * - DRM sysfs class
833 * - DRM debugfs root
834 *
835 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
836 * interface registered on a DRM device, you can request minor numbers from DRM
837 * core. DRM core takes care of major-number management and char-dev
838 * registration. A stub ->open() callback forwards any open() requests to the
839 * registered minor.
840 */
841
842static int drm_stub_open(struct inode *inode, struct file *filp)
843{
844 const struct file_operations *new_fops;
845 struct drm_minor *minor;
846 int err;
847
848 DRM_DEBUG("\n");
849
850 mutex_lock(&drm_global_mutex);
851 minor = drm_minor_acquire(iminor(inode));
852 if (IS_ERR(minor)) {
853 err = PTR_ERR(minor);
854 goto out_unlock;
855 }
856
857 new_fops = fops_get(minor->dev->driver->fops);
858 if (!new_fops) {
859 err = -ENODEV;
860 goto out_release;
861 }
862
863 replace_fops(filp, new_fops);
864 if (filp->f_op->open)
865 err = filp->f_op->open(inode, filp);
866 else
867 err = 0;
868
869out_release:
870 drm_minor_release(minor);
871out_unlock:
872 mutex_unlock(&drm_global_mutex);
873 return err;
874}
875
876static const struct file_operations drm_stub_fops = {
877 .owner = THIS_MODULE,
878 .open = drm_stub_open,
879 .llseek = noop_llseek,
880};
881
882static int __init drm_core_init(void)
883{
884 int ret = -ENOMEM;
885
886 drm_global_init();
887 drm_connector_ida_init();
888 idr_init(&drm_minors_idr);
889
890 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
891 goto err_p1;
892
David Herrmannfcc90212015-09-09 14:21:30 +0200893 ret = drm_sysfs_init();
894 if (ret < 0) {
David Herrmann1b7199f2014-07-23 12:29:56 +0200895 printk(KERN_ERR "DRM: Error creating drm class.\n");
David Herrmann1b7199f2014-07-23 12:29:56 +0200896 goto err_p2;
897 }
898
899 drm_debugfs_root = debugfs_create_dir("dri", NULL);
900 if (!drm_debugfs_root) {
901 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
902 ret = -1;
903 goto err_p3;
904 }
905
906 DRM_INFO("Initialized %s %d.%d.%d %s\n",
907 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
908 return 0;
909err_p3:
910 drm_sysfs_destroy();
911err_p2:
912 unregister_chrdev(DRM_MAJOR, "drm");
913
914 idr_destroy(&drm_minors_idr);
915err_p1:
916 return ret;
917}
918
919static void __exit drm_core_exit(void)
920{
921 debugfs_remove(drm_debugfs_root);
922 drm_sysfs_destroy();
923
924 unregister_chrdev(DRM_MAJOR, "drm");
925
926 drm_connector_ida_destroy();
927 idr_destroy(&drm_minors_idr);
928}
929
930module_init(drm_core_init);
931module_exit(drm_core_exit);