blob: e26b59e385ff151116f5af63bf47626c2839f8eb [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>
David Howells760285e2012-10-02 18:01:07 +010037#include <drm/drmP.h>
David Herrmanne7b960702014-07-24 12:10:04 +020038#include "drm_legacy.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Dave Airliec94f7022005-07-07 21:03:38 +100040static int drm_notifier(void *priv);
41
Daniel Vetter4ac5ec42010-08-23 22:53:34 +020042static int drm_lock_take(struct drm_lock_data *lock_data, unsigned int context);
43
Dave Airlieb5e89ed2005-09-25 14:28:13 +100044/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 * Lock ioctl.
46 *
47 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +100048 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 * \param cmd command.
50 * \param arg user argument, pointing to a drm_lock structure.
51 * \return zero on success or negative number on failure.
52 *
53 * Add the current task to the lock wait queue, and attempt to take to lock.
54 */
Eric Anholtc153f452007-09-03 12:06:45 +100055int drm_lock(struct drm_device *dev, void *data, struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Dave Airlieb5e89ed2005-09-25 14:28:13 +100057 DECLARE_WAITQUEUE(entry, current);
Eric Anholtc153f452007-09-03 12:06:45 +100058 struct drm_lock *lock = data;
Dave Airlie7c1c2872008-11-28 14:22:24 +100059 struct drm_master *master = file_priv->master;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100060 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Eric Anholt6c340ea2007-08-25 20:23:09 +100062 ++file_priv->lock_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Eric Anholtc153f452007-09-03 12:06:45 +100064 if (lock->context == DRM_KERNEL_CONTEXT) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +100065 DRM_ERROR("Process %d using kernel context %d\n",
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -070066 task_pid_nr(current), lock->context);
Dave Airlieb5e89ed2005-09-25 14:28:13 +100067 return -EINVAL;
68 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Dave Airlieb5e89ed2005-09-25 14:28:13 +100070 DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -070071 lock->context, task_pid_nr(current),
Dave Airlie7c1c2872008-11-28 14:22:24 +100072 master->lock.hw_lock->lock, lock->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Dave Airlie7c1c2872008-11-28 14:22:24 +100074 add_wait_queue(&master->lock.lock_queue, &entry);
75 spin_lock_bh(&master->lock.spinlock);
76 master->lock.user_waiters++;
77 spin_unlock_bh(&master->lock.spinlock);
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 for (;;) {
80 __set_current_state(TASK_INTERRUPTIBLE);
Dave Airlie7c1c2872008-11-28 14:22:24 +100081 if (!master->lock.hw_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 /* Device has been unregistered */
Thomas Hellstromfda714c2009-03-02 11:10:56 +010083 send_sig(SIGTERM, current, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 ret = -EINTR;
85 break;
86 }
Dave Airlie7c1c2872008-11-28 14:22:24 +100087 if (drm_lock_take(&master->lock, lock->context)) {
88 master->lock.file_priv = file_priv;
89 master->lock.lock_time = jiffies;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100090 break; /* Got lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +100092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 /* Contention */
Arnd Bergmann08f2e662010-08-27 08:55:28 +100094 mutex_unlock(&drm_global_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 schedule();
Arnd Bergmann08f2e662010-08-27 08:55:28 +100096 mutex_lock(&drm_global_mutex);
Dave Airlieb5e89ed2005-09-25 14:28:13 +100097 if (signal_pending(current)) {
Thomas Hellstrom4d77c882009-03-02 11:10:54 +010098 ret = -EINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 break;
100 }
101 }
Dave Airlie7c1c2872008-11-28 14:22:24 +1000102 spin_lock_bh(&master->lock.spinlock);
103 master->lock.user_waiters--;
104 spin_unlock_bh(&master->lock.spinlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 __set_current_state(TASK_RUNNING);
Dave Airlie7c1c2872008-11-28 14:22:24 +1000106 remove_wait_queue(&master->lock.lock_queue, &entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Eric Anholtc153f452007-09-03 12:06:45 +1000108 DRM_DEBUG("%d %s\n", lock->context,
109 ret ? "interrupted" : "has lock");
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100110 if (ret) return ret;
Dave Airlied985c102006-01-02 21:32:48 +1100111
Dave Airlie3e5fc802008-08-24 17:02:26 +1000112 /* don't set the block all signals on the master process for now
113 * really probably not the correct answer but lets us debug xkb
114 * xserver for now */
Dave Airlie7963e9d2014-08-08 07:30:53 +1000115 if (!file_priv->is_master) {
Dave Airlie3e5fc802008-08-24 17:02:26 +1000116 sigemptyset(&dev->sigmask);
117 sigaddset(&dev->sigmask, SIGSTOP);
118 sigaddset(&dev->sigmask, SIGTSTP);
119 sigaddset(&dev->sigmask, SIGTTIN);
120 sigaddset(&dev->sigmask, SIGTTOU);
121 dev->sigdata.context = lock->context;
Dave Airlie7c1c2872008-11-28 14:22:24 +1000122 dev->sigdata.lock = master->lock.hw_lock;
Dave Airlie3e5fc802008-08-24 17:02:26 +1000123 block_all_signals(drm_notifier, &dev->sigdata, &dev->sigmask);
124 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000125
Eric Anholtc153f452007-09-03 12:06:45 +1000126 if (dev->driver->dma_quiescent && (lock->flags & _DRM_LOCK_QUIESCENT))
127 {
Dave Airlied985c102006-01-02 21:32:48 +1100128 if (dev->driver->dma_quiescent(dev)) {
Eric Anholtc153f452007-09-03 12:06:45 +1000129 DRM_DEBUG("%d waiting for DMA quiescent\n",
130 lock->context);
Eric Anholt20caafa2007-08-25 19:22:43 +1000131 return -EBUSY;
Dave Airlied985c102006-01-02 21:32:48 +1100132 }
133 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Dave Airlied985c102006-01-02 21:32:48 +1100135 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000138/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 * Unlock ioctl.
140 *
141 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000142 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 * \param cmd command.
144 * \param arg user argument, pointing to a drm_lock structure.
145 * \return zero on success or negative number on failure.
146 *
147 * Transfer and free the lock.
148 */
Eric Anholtc153f452007-09-03 12:06:45 +1000149int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
Eric Anholtc153f452007-09-03 12:06:45 +1000151 struct drm_lock *lock = data;
Daniel Vetter45ff46c2010-09-26 00:24:48 +0200152 struct drm_master *master = file_priv->master;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Eric Anholtc153f452007-09-03 12:06:45 +1000154 if (lock->context == DRM_KERNEL_CONTEXT) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000155 DRM_ERROR("Process %d using kernel context %d\n",
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -0700156 task_pid_nr(current), lock->context);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 return -EINVAL;
158 }
159
Daniel Vetter45ff46c2010-09-26 00:24:48 +0200160 if (drm_lock_free(&master->lock, lock->context)) {
161 /* FIXME: Should really bail out here. */
162 }
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 unblock_all_signals();
165 return 0;
166}
167
168/**
169 * Take the heavyweight lock.
170 *
171 * \param lock lock pointer.
172 * \param context locking context.
173 * \return one if the lock is held, or zero otherwise.
174 *
175 * Attempt to mark the lock as held by the given context, via the \p cmpxchg instruction.
176 */
Daniel Vetter4ac5ec42010-08-23 22:53:34 +0200177static
Dave Airlie55910512007-07-11 16:53:40 +1000178int drm_lock_take(struct drm_lock_data *lock_data,
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100179 unsigned int context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
181 unsigned int old, new, prev;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100182 volatile unsigned int *lock = &lock_data->hw_lock->lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000184 spin_lock_bh(&lock_data->spinlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 do {
186 old = *lock;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000187 if (old & _DRM_LOCK_HELD)
188 new = old | _DRM_LOCK_CONT;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100189 else {
190 new = context | _DRM_LOCK_HELD |
191 ((lock_data->user_waiters + lock_data->kernel_waiters > 1) ?
192 _DRM_LOCK_CONT : 0);
193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 prev = cmpxchg(lock, old, new);
195 } while (prev != old);
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000196 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 if (_DRM_LOCKING_CONTEXT(old) == context) {
199 if (old & _DRM_LOCK_HELD) {
200 if (context != DRM_KERNEL_CONTEXT) {
201 DRM_ERROR("%d holds heavyweight lock\n",
202 context);
203 }
204 return 0;
205 }
206 }
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100207
208 if ((_DRM_LOCKING_CONTEXT(new)) == context && (new & _DRM_LOCK_HELD)) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000209 /* Have lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return 1;
211 }
212 return 0;
213}
214
215/**
216 * This takes a lock forcibly and hands it to context. Should ONLY be used
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000217 * inside *_unlock to give lock to kernel before calling *_dma_schedule.
218 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 * \param dev DRM device.
220 * \param lock lock pointer.
221 * \param context locking context.
222 * \return always one.
223 *
224 * Resets the lock file pointer.
225 * Marks the lock as held by the given context, via the \p cmpxchg instruction.
226 */
Dave Airlie55910512007-07-11 16:53:40 +1000227static int drm_lock_transfer(struct drm_lock_data *lock_data,
Dave Airliec94f7022005-07-07 21:03:38 +1000228 unsigned int context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
230 unsigned int old, new, prev;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100231 volatile unsigned int *lock = &lock_data->hw_lock->lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Eric Anholt6c340ea2007-08-25 20:23:09 +1000233 lock_data->file_priv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 do {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000235 old = *lock;
236 new = context | _DRM_LOCK_HELD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 prev = cmpxchg(lock, old, new);
238 } while (prev != old);
239 return 1;
240}
241
242/**
243 * Free lock.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000244 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 * \param dev DRM device.
246 * \param lock lock.
247 * \param context context.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000248 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 * Resets the lock file pointer.
250 * Marks the lock as not held, via the \p cmpxchg instruction. Wakes any task
251 * waiting on the lock queue.
252 */
Dave Airlie55910512007-07-11 16:53:40 +1000253int drm_lock_free(struct drm_lock_data *lock_data, unsigned int context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
255 unsigned int old, new, prev;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100256 volatile unsigned int *lock = &lock_data->hw_lock->lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000258 spin_lock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100259 if (lock_data->kernel_waiters != 0) {
260 drm_lock_transfer(lock_data, 0);
261 lock_data->idle_has_lock = 1;
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000262 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100263 return 1;
264 }
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000265 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 do {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000268 old = *lock;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100269 new = _DRM_LOCKING_CONTEXT(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 prev = cmpxchg(lock, old, new);
271 } while (prev != old);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) {
274 DRM_ERROR("%d freed heavyweight lock held by %d\n",
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000275 context, _DRM_LOCKING_CONTEXT(old));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 return 1;
277 }
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100278 wake_up_interruptible(&lock_data->lock_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 return 0;
280}
281
282/**
283 * If we get here, it means that the process has called DRM_IOCTL_LOCK
284 * without calling DRM_IOCTL_UNLOCK.
285 *
286 * If the lock is not held, then let the signal proceed as usual. If the lock
287 * is held, then set the contended flag and keep the signal blocked.
288 *
289 * \param priv pointer to a drm_sigdata structure.
290 * \return one if the signal should be delivered normally, or zero if the
291 * signal should be blocked.
292 */
Dave Airliec94f7022005-07-07 21:03:38 +1000293static int drm_notifier(void *priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Dave Airlie55910512007-07-11 16:53:40 +1000295 struct drm_sigdata *s = (struct drm_sigdata *) priv;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000296 unsigned int old, new, prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000298 /* Allow signal delivery if lock isn't held */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 if (!s->lock || !_DRM_LOCK_IS_HELD(s->lock->lock)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000300 || _DRM_LOCKING_CONTEXT(s->lock->lock) != s->context)
301 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000303 /* Otherwise, set flag to force call to
304 drmUnlock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 do {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000306 old = s->lock->lock;
307 new = old | _DRM_LOCK_CONT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 prev = cmpxchg(&s->lock->lock, old, new);
309 } while (prev != old);
310 return 0;
311}
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100312
313/**
314 * This function returns immediately and takes the hw lock
315 * with the kernel context if it is free, otherwise it gets the highest priority when and if
316 * it is eventually released.
317 *
318 * This guarantees that the kernel will _eventually_ have the lock _unless_ it is held
319 * by a blocked process. (In the latter case an explicit wait for the hardware lock would cause
320 * a deadlock, which is why the "idlelock" was invented).
321 *
322 * This should be sufficient to wait for GPU idle without
323 * having to worry about starvation.
324 */
325
Dave Airlie55910512007-07-11 16:53:40 +1000326void drm_idlelock_take(struct drm_lock_data *lock_data)
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100327{
Laurent Pinchart4a1b0712012-05-17 13:27:21 +0200328 int ret;
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100329
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000330 spin_lock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100331 lock_data->kernel_waiters++;
332 if (!lock_data->idle_has_lock) {
333
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000334 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100335 ret = drm_lock_take(lock_data, DRM_KERNEL_CONTEXT);
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000336 spin_lock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100337
338 if (ret == 1)
339 lock_data->idle_has_lock = 1;
340 }
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000341 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100342}
Dave Airlie5c2a5ce2011-12-22 19:09:01 +0000343EXPORT_SYMBOL(drm_idlelock_take);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100344
Dave Airlie55910512007-07-11 16:53:40 +1000345void drm_idlelock_release(struct drm_lock_data *lock_data)
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100346{
347 unsigned int old, prev;
348 volatile unsigned int *lock = &lock_data->hw_lock->lock;
349
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000350 spin_lock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100351 if (--lock_data->kernel_waiters == 0) {
352 if (lock_data->idle_has_lock) {
353 do {
354 old = *lock;
355 prev = cmpxchg(lock, old, DRM_KERNEL_CONTEXT);
356 } while (prev != old);
357 wake_up_interruptible(&lock_data->lock_queue);
358 lock_data->idle_has_lock = 0;
359 }
360 }
Thomas Hellstromf116cc52008-05-07 12:22:39 +1000361 spin_unlock_bh(&lock_data->spinlock);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100362}
Dave Airlie5c2a5ce2011-12-22 19:09:01 +0000363EXPORT_SYMBOL(drm_idlelock_release);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100364
Eric Anholtc153f452007-09-03 12:06:45 +1000365int drm_i_have_hw_lock(struct drm_device *dev, struct drm_file *file_priv)
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100366{
Dave Airlie7c1c2872008-11-28 14:22:24 +1000367 struct drm_master *master = file_priv->master;
368 return (file_priv->lock_count && master->lock.hw_lock &&
369 _DRM_LOCK_IS_HELD(master->lock.hw_lock->lock) &&
370 master->lock.file_priv == file_priv);
Thomas Hellstrom040ac322007-03-23 13:28:33 +1100371}