io/drm/drm_lock.c

7  * lock.c -- IOCTLs for locking -*- linux-c -*-
46 	volatile unsigned int *lock = &lock_data->hw_lock->lock;
49 		old = *lock;
54 	} while (!atomic_cmpset_int(lock, old, new));
59 				DRM_ERROR("%d holds heavyweight lock\n",
66 		/* Have lock */
73  * This takes a lock forcibly and hands it to context.	Should ONLY be used
74  * inside *_unlock to give lock to kernel before calling *_dma_schedule.
81 	volatile unsigned int *lock = &lock_data->hw_lock->lock;
83 	dev->lock.filp = NULL;
85 		old  = *lock;
87 	} while (!atomic_cmpset_int(lock, old, new));
93 drm_lock_free(drm_device_t *dev, volatile unsigned int *lock,
98 	mutex_enter(&(dev->lock.lock_mutex));
99 	dev->lock.filp = NULL;
101 		old  = *lock;
103 	} while (!atomic_cmpset_int(lock, old, new));
107 		DRM_ERROR("%d freed heavyweight lock held by %d\n",
109 		mutex_exit(&(dev->lock.lock_mutex));
112 	cv_broadcast(&(dev->lock.lock_cv));
113 	mutex_exit(&(dev->lock.lock_mutex));
122 	drm_lock_t lock;
125 	DRM_COPYFROM_WITH_RETURN(&lock, (void *)data, sizeof (lock));
127 	if (lock.context == DRM_KERNEL_CONTEXT) {
129 		    DRM_CURRENTPID, lock.context);
133 	DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
134 	    lock.context, DRM_CURRENTPID, dev->lock.hw_lock->lock,
135 	    lock.flags);
136 	if (dev->driver->use_dma_queue && lock.context < 0)
139 	mutex_enter(&(dev->lock.lock_mutex));
141 		if (drm_lock_take(&dev->lock, lock.context)) {
142 			dev->lock.filp = fpriv;
143 			dev->lock.lock_time = ddi_get_lbolt();
144 			break;  /* Got lock */
146 		ret = cv_wait_sig(&(dev->lock.lock_cv),
147 		    &(dev->lock.lock_mutex));
150 			mutex_exit(&(dev->lock.lock_mutex));
154 	mutex_exit(&(dev->lock.lock_mutex));
155 	DRM_DEBUG("%d %s\n", lock.context, ret ? "interrupted" : "has lock");
158 	    (lock.flags & _DRM_LOCK_QUIESCENT))
169 	drm_lock_t lock;
171 	DRM_COPYFROM_WITH_RETURN(&lock, (void *)data, sizeof (lock));
174 	    lock.context, DRM_CURRENTPID, dev->lock.hw_lock->lock,
175 	    lock.flags);
177 	if (lock.context == DRM_KERNEL_CONTEXT) {
179 		    DRM_CURRENTPID, lock.context);
185 	if (drm_lock_free(dev, &dev->lock.hw_lock->lock, lock.context)) {