blob: c79c713eeba0ec62aa759dcb6de69404692f5758 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
Dave Airlieb5e89ed2005-09-25 14:28:13 +10002 * \file drm_lock.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * IOCTLs for locking
Dave Airlieb5e89ed2005-09-25 14:28:13 +10004 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
11 *
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
Dave Airlie5c2a5ce2011-12-22 19:09:01 +000036#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "drmP.h"
38
Dave Airliec94f7022005-07-07 21:03:38 +100039static int drm_notifier(void *priv);
40
Daniel Vetter4ac5ec42010-08-23 22:53:34 +020041static int drm_lock_take(struct drm_lock_data *lock_data, unsigned int context);
42
Dave Airlieb5e89ed2005-09-25 14:28:13 +100043/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 * Lock ioctl.
45 *
46 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +100047 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 * \param cmd command.
49 * \param arg user argument, pointing to a drm_lock structure.
50 * \return zero on success or negative number on failure.
51 *
52 * Add the current task to the lock wait queue, and attempt to take to lock.
53 */
Eric Anholtc153f452007-09-03 12:06:45 +100054int drm_lock(struct drm_device *dev, void *data, struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Dave Airlieb5e89ed2005-09-25 14:28:13 +100056 DECLARE_WAITQUEUE(entry, current);
Eric Anholtc153f452007-09-03 12:06:45 +100057 struct drm_lock *lock = data;
Dave Airlie7c1c2872008-11-28 14:22:24 +100058 struct drm_master *master = file_priv->master;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100059 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Eric Anholt6c340ea2007-08-25 20:23:09 +100061 ++file_priv->lock_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Eric Anholtc153f452007-09-03 12:06:45 +100063 if (lock->context == DRM_KERNEL_CONTEXT) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +100064 DRM_ERROR("Process %d using kernel context %d\n",
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -070065 task_pid_nr(current), lock->context);
Dave Airlieb5e89ed2005-09-25 14:28:13 +100066 return -EINVAL;
67 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Dave Airlieb5e89ed2005-09-25 14:28:13 +100069 DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -070070 lock->context, task_pid_nr(current),
Dave Airlie7c1c2872008-11-28 14:22:24 +100071 master->lock.hw_lock->lock, lock->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE))
Eric Anholtc153f452007-09-03 12:06:45 +100074 if (lock->context < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 return -EINVAL;
76
Dave Airlie7c1c2872008-11-28 14:22:24 +100077 add_wait_queue(&master->lock.lock_queue, &entry);
78 spin_lock_bh(&master->lock.spinlock);
79 master->lock.user_waiters++;
80 spin_unlock_bh(&master->lock.spinlock);
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 for (;;) {
83 __set_current_state(TASK_INTERRUPTIBLE);
Dave Airlie7c1c2872008-11-28 14:22:24 +100084 if (!master->lock.hw_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 /* Device has been unregistered */
Thomas Hellstromfda714c2009-03-02 11:10:56 +010086 send_sig(SIGTERM, current, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 ret = -EINTR;
88 break;
89 }
Dave Airlie7c1c2872008-11-28 14:22:24 +100090 if (drm_lock_take(&master->lock, lock->context)) {
91 master->lock.file_priv = file_priv;
92 master->lock.lock_time = jiffies;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100093 atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
94 break; /* Got lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +100096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 /* Contention */
Arnd Bergmann08f2e662010-08-27 08:55:28 +100098 mutex_unlock(&drm_global_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 schedule();
Arnd Bergmann08f2e662010-08-27 08:55:28 +1000100 mutex_lock(&drm_global_mutex);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000101 if (signal_pending(current)) {
Thomas Hellstrom4d77c882009-03-02 11:10:54 +0100102 ret = -EINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 break;
104 }
105 }
Dave Airlie7c1c2872008-11-28 14:22:24 +1000106 spin_lock_bh(&master->lock.spinlock);
107 master->lock.user_waiters--;
108 spin_unlock_bh(&master->lock.spinlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 __set_current_state(TASK_RUNNING);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000110 remove_wait_queue(&master->lock.lock_queue, &entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Eric Anholtc153f452007-09-03 12:06:45 +1000112 DRM_DEBUG("%d %s\n", lock->context,
113 ret ? "interrupted" : "has lock");
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100114 if (ret) return ret;
Dave Airlied985c102006-01-02 21:32:48 +1100115
Dave Airlie3e5fc802008-08-24 17:02:26 +1000116 /* don't set the block all signals on the master process for now
117 * really probably not the correct answer but lets us debug xkb
118 * xserver for now */
Dave Airlie7c1c2872008-11-28 14:22:24 +1000119 if (!file_priv->is_master) {
Dave Airlie3e5fc802008-08-24 17:02:26 +1000120 sigemptyset(&dev->sigmask);
121 sigaddset(&dev->sigmask, SIGSTOP);
122 sigaddset(&dev->sigmask, SIGTSTP);
123 sigaddset(&dev->sigmask, SIGTTIN);
124 sigaddset(&dev->sigmask, SIGTTOU);
125 dev->sigdata.context = lock->context;
Dave Airlie7c1c2872008-11-28 14:22:24 +1000126 dev->sigdata.lock = master->lock.hw_lock;
Dave Airlie3e5fc802008-08-24 17:02:26 +1000127 block_all_signals(drm_notifier, &dev->sigdata, &dev->sigmask);
128 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000129
Eric Anholtc153f452007-09-03 12:06:45 +1000130 if (dev->driver->dma_quiescent && (lock->flags & _DRM_LOCK_QUIESCENT))
131 {
Dave Airlied985c102006-01-02 21:32:48 +1100132 if (dev->driver->dma_quiescent(dev)) {
Eric Anholtc153f452007-09-03 12:06:45 +1000133 DRM_DEBUG("%d waiting for DMA quiescent\n",
134 lock->context);
Eric Anholt20caafa2007-08-25 19:22:43 +1000135 return -EBUSY;
Dave Airlied985c102006-01-02 21:32:48 +1100136 }
137 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Dave Airlied985c102006-01-02 21:32:48 +1100139 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000142/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 * Unlock ioctl.
144 *
145 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000146 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 * \param cmd command.
148 * \param arg user argument, pointing to a drm_lock structure.
149 * \return zero on success or negative number on failure.
150 *
151 * Transfer and free the lock.
152 */
Eric Anholtc153f452007-09-03 12:06:45 +1000153int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
Eric Anholtc153f452007-09-03 12:06:45 +1000155 struct drm_lock *lock = data;
Daniel Vetter45ff46c2010-09-26 00:24:48 +0200156 struct drm_master *master = file_priv->master;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Eric Anholtc153f452007-09-03 12:06:45 +1000158 if (lock->context == DRM_KERNEL_CONTEXT) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000159 DRM_ERROR("Process %d using kernel context %d\n",
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -0700160 task_pid_nr(current), lock->context);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 return -EINVAL;
162 }
163
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000164 atomic_inc(&dev->counts[_DRM_STAT_UNLOCKS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Daniel Vetter45ff46c2010-09-26 00:24:48 +0200166 if (drm_lock_free(&master->lock, lock->context)) {
167 /* FIXME: Should really bail out here. */
168 }
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 unblock_all_signals();
171 return 0;
172}
173
174/**
175 * Take the heavyweight lock.
176 *
177 * \param lock lock pointer.
178 * \param context locking context.
179 * \return one if the lock is held, or zero otherwise.
180 *
181 * Attempt to mark the lock as held by the given context, via the \p cmpxchg instruction.
182 */
Daniel Vetter4ac5ec42010-08-23 22:53:34 +0200183static
Dave Airlie55910512007-07-11 16:53:40 +1000184int drm_lock_take(struct drm_lock_data *lock_data,
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100185 unsigned int context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
187 unsigned int old, new, prev;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100188 volatile unsigned int *lock = &lock_data->hw_lock->lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000190 spin_lock_bh(&lock_data->spinlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 do {
192 old = *lock;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000193 if (old & _DRM_LOCK_HELD)
194 new = old | _DRM_LOCK_CONT;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100195 else {
196 new = context | _DRM_LOCK_HELD |
197 ((lock_data->user_waiters + lock_data->kernel_waiters > 1) ?
198 _DRM_LOCK_CONT : 0);
199 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 prev = cmpxchg(lock, old, new);
201 } while (prev != old);
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000202 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (_DRM_LOCKING_CONTEXT(old) == context) {
205 if (old & _DRM_LOCK_HELD) {
206 if (context != DRM_KERNEL_CONTEXT) {
207 DRM_ERROR("%d holds heavyweight lock\n",
208 context);
209 }
210 return 0;
211 }
212 }
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100213
214 if ((_DRM_LOCKING_CONTEXT(new)) == context && (new & _DRM_LOCK_HELD)) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000215 /* Have lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 return 1;
217 }
218 return 0;
219}
220
221/**
222 * This takes a lock forcibly and hands it to context. Should ONLY be used
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000223 * inside *_unlock to give lock to kernel before calling *_dma_schedule.
224 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 * \param dev DRM device.
226 * \param lock lock pointer.
227 * \param context locking context.
228 * \return always one.
229 *
230 * Resets the lock file pointer.
231 * Marks the lock as held by the given context, via the \p cmpxchg instruction.
232 */
Dave Airlie55910512007-07-11 16:53:40 +1000233static int drm_lock_transfer(struct drm_lock_data *lock_data,
Dave Airliec94f7022005-07-07 21:03:38 +1000234 unsigned int context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235{
236 unsigned int old, new, prev;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100237 volatile unsigned int *lock = &lock_data->hw_lock->lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Eric Anholt6c340ea2007-08-25 20:23:09 +1000239 lock_data->file_priv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 do {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000241 old = *lock;
242 new = context | _DRM_LOCK_HELD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 prev = cmpxchg(lock, old, new);
244 } while (prev != old);
245 return 1;
246}
247
248/**
249 * Free lock.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000250 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 * \param dev DRM device.
252 * \param lock lock.
253 * \param context context.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000254 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 * Resets the lock file pointer.
256 * Marks the lock as not held, via the \p cmpxchg instruction. Wakes any task
257 * waiting on the lock queue.
258 */
Dave Airlie55910512007-07-11 16:53:40 +1000259int drm_lock_free(struct drm_lock_data *lock_data, unsigned int context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
261 unsigned int old, new, prev;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100262 volatile unsigned int *lock = &lock_data->hw_lock->lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000264 spin_lock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100265 if (lock_data->kernel_waiters != 0) {
266 drm_lock_transfer(lock_data, 0);
267 lock_data->idle_has_lock = 1;
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000268 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100269 return 1;
270 }
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000271 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 do {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000274 old = *lock;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100275 new = _DRM_LOCKING_CONTEXT(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 prev = cmpxchg(lock, old, new);
277 } while (prev != old);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) {
280 DRM_ERROR("%d freed heavyweight lock held by %d\n",
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000281 context, _DRM_LOCKING_CONTEXT(old));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return 1;
283 }
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100284 wake_up_interruptible(&lock_data->lock_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return 0;
286}
287
288/**
289 * If we get here, it means that the process has called DRM_IOCTL_LOCK
290 * without calling DRM_IOCTL_UNLOCK.
291 *
292 * If the lock is not held, then let the signal proceed as usual. If the lock
293 * is held, then set the contended flag and keep the signal blocked.
294 *
295 * \param priv pointer to a drm_sigdata structure.
296 * \return one if the signal should be delivered normally, or zero if the
297 * signal should be blocked.
298 */
Dave Airliec94f7022005-07-07 21:03:38 +1000299static int drm_notifier(void *priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Dave Airlie55910512007-07-11 16:53:40 +1000301 struct drm_sigdata *s = (struct drm_sigdata *) priv;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000302 unsigned int old, new, prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000304 /* Allow signal delivery if lock isn't held */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 if (!s->lock || !_DRM_LOCK_IS_HELD(s->lock->lock)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000306 || _DRM_LOCKING_CONTEXT(s->lock->lock) != s->context)
307 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000309 /* Otherwise, set flag to force call to
310 drmUnlock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 do {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000312 old = s->lock->lock;
313 new = old | _DRM_LOCK_CONT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 prev = cmpxchg(&s->lock->lock, old, new);
315 } while (prev != old);
316 return 0;
317}
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100318
319/**
320 * This function returns immediately and takes the hw lock
321 * with the kernel context if it is free, otherwise it gets the highest priority when and if
322 * it is eventually released.
323 *
324 * This guarantees that the kernel will _eventually_ have the lock _unless_ it is held
325 * by a blocked process. (In the latter case an explicit wait for the hardware lock would cause
326 * a deadlock, which is why the "idlelock" was invented).
327 *
328 * This should be sufficient to wait for GPU idle without
329 * having to worry about starvation.
330 */
331
Dave Airlie55910512007-07-11 16:53:40 +1000332void drm_idlelock_take(struct drm_lock_data *lock_data)
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100333{
334 int ret = 0;
335
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000336 spin_lock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100337 lock_data->kernel_waiters++;
338 if (!lock_data->idle_has_lock) {
339
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000340 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100341 ret = drm_lock_take(lock_data, DRM_KERNEL_CONTEXT);
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000342 spin_lock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100343
344 if (ret == 1)
345 lock_data->idle_has_lock = 1;
346 }
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000347 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100348}
Dave Airlie5c2a5ce2011-12-22 19:09:01 +0000349EXPORT_SYMBOL(drm_idlelock_take);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100350
Dave Airlie55910512007-07-11 16:53:40 +1000351void drm_idlelock_release(struct drm_lock_data *lock_data)
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100352{
353 unsigned int old, prev;
354 volatile unsigned int *lock = &lock_data->hw_lock->lock;
355
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000356 spin_lock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100357 if (--lock_data->kernel_waiters == 0) {
358 if (lock_data->idle_has_lock) {
359 do {
360 old = *lock;
361 prev = cmpxchg(lock, old, DRM_KERNEL_CONTEXT);
362 } while (prev != old);
363 wake_up_interruptible(&lock_data->lock_queue);
364 lock_data->idle_has_lock = 0;
365 }
366 }
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000367 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100368}
Dave Airlie5c2a5ce2011-12-22 19:09:01 +0000369EXPORT_SYMBOL(drm_idlelock_release);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100370
Eric Anholtc153f452007-09-03 12:06:45 +1000371int drm_i_have_hw_lock(struct drm_device *dev, struct drm_file *file_priv)
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100372{
Dave Airlie7c1c2872008-11-28 14:22:24 +1000373 struct drm_master *master = file_priv->master;
374 return (file_priv->lock_count && master->lock.hw_lock &&
375 _DRM_LOCK_IS_HELD(master->lock.hw_lock->lock) &&
376 master->lock.file_priv == file_priv);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100377}