37  * DOC: master and authentication
41  * least once successfully became the device master (either through the
43  * no one else is the current master that time) there exists one &drm_master.
47  * In addition only one &drm_master can be the current master for a &drm_device.
52  * Clients can authenticate against the current master (if it matches their own)
65 		ret = idr_alloc(&file_priv->master->magic_map, file_priv,  in drm_getmagic()
87 	file = idr_find(&file_priv->master->magic_map, auth->magic);  in drm_authmagic()
90 		idr_replace(&file_priv->master->magic_map, NULL, auth->magic);  in drm_authmagic()
99 	struct drm_master *master;  in drm_master_create()  local
101 	master = kzalloc(sizeof(*master), GFP_KERNEL);  in drm_master_create()
102 	if (!master)  in drm_master_create()
105 	kref_init(&master->refcount);  in drm_master_create()
106 	spin_lock_init(&master->lock.spinlock);  in drm_master_create()
107 	init_waitqueue_head(&master->lock.lock_queue);  in drm_master_create()
108 	idr_init(&master->magic_map);  in drm_master_create()
109 	master->dev = dev;  in drm_master_create()
112 	master->lessor = NULL;  in drm_master_create()
113 	master->lessee_id = 0;  in drm_master_create()
114 	INIT_LIST_HEAD(&master->lessees);  in drm_master_create()
115 	INIT_LIST_HEAD(&master->lessee_list);  in drm_master_create()
116 	idr_init(&master->leases);  in drm_master_create()
117 	idr_init(&master->lessee_idr);  in drm_master_create()
119 	return master;  in drm_master_create()
127 	dev->master = drm_master_get(fpriv->master);  in drm_set_master()
131 			drm_master_put(&dev->master);  in drm_set_master()
146 	old_master = fpriv->master;  in drm_new_set_master()
147 	fpriv->master = drm_master_create(dev);  in drm_new_set_master()
148 	if (!fpriv->master) {  in drm_new_set_master()
149 		fpriv->master = old_master;  in drm_new_set_master()
154 		ret = dev->driver->master_create(dev, fpriv->master);  in drm_new_set_master()
171 	/* drop references and restore old master on failure */  in drm_new_set_master()
172 	drm_master_put(&fpriv->master);  in drm_new_set_master()
173 	fpriv->master = old_master;  in drm_new_set_master()
188 	if (dev->master) {  in drm_setmaster_ioctl()
193 	if (!file_priv->master) {  in drm_setmaster_ioctl()
203 	if (file_priv->master->lessor != NULL) {  in drm_setmaster_ioctl()
204 		DRM_DEBUG_LEASE("Attempt to set lessee %d as master\n", file_priv->master->lessee_id);  in drm_setmaster_ioctl()
220 	drm_master_put(&dev->master);  in drm_drop_master()
232 	if (!dev->master)  in drm_dropmaster_ioctl()
235 	if (file_priv->master->lessor != NULL) {  in drm_dropmaster_ioctl()
236 		DRM_DEBUG_LEASE("Attempt to drop lessee %d as master\n", file_priv->master->lessee_id);  in drm_dropmaster_ioctl()
253 	/* if there is no current master make this fd it, but do not create  in drm_master_open()
254 	 * any master object for render clients */  in drm_master_open()
256 	if (!dev->master)  in drm_master_open()
259 		file_priv->master = drm_master_get(dev->master);  in drm_master_open()
268 	struct drm_master *master = file_priv->master;  in drm_master_release()  local
272 		idr_remove(&file_priv->master->magic_map, file_priv->magic);  in drm_master_release()
279 		 * Since the master is disappearing, so is the  in drm_master_release()
283 		if (master->lock.hw_lock) {  in drm_master_release()
284 			if (dev->sigdata.lock == master->lock.hw_lock)  in drm_master_release()
286 			master->lock.hw_lock = NULL;  in drm_master_release()
287 			master->lock.file_priv = NULL;  in drm_master_release()
288 			wake_up_interruptible_all(&master->lock.lock_queue);  in drm_master_release()
293 	if (dev->master == file_priv->master)  in drm_master_release()
298 		 * this is the "real" master  in drm_master_release()
300 		drm_lease_revoke(master);  in drm_master_release()
303 	/* drop the master reference held by the file priv */  in drm_master_release()
304 	if (file_priv->master)  in drm_master_release()
305 		drm_master_put(&file_priv->master);  in drm_master_release()
310  * drm_is_current_master - checks whether @priv is the current master
313  * Checks whether @fpriv is current master on its device. This decides whether a
317  * - the current master is assumed to own the non-shareable display hardware.
321 	return fpriv->is_master && drm_lease_owner(fpriv->master) == fpriv->minor->dev->master;  in drm_is_current_master()
326  * drm_master_get - reference a master pointer
327  * @master: &struct drm_master
329  * Increments the reference count of @master and returns a pointer to @master.
331 struct drm_master *drm_master_get(struct drm_master *master)  in drm_master_get()  argument
333 	kref_get(&master->refcount);  in drm_master_get()
334 	return master;  in drm_master_get()
340 	struct drm_master *master = container_of(kref, struct drm_master, refcount);  in drm_master_destroy()  local
341 	struct drm_device *dev = master->dev;  in drm_master_destroy()
344 		drm_lease_destroy(master);  in drm_master_destroy()
347 		dev->driver->master_destroy(dev, master);  in drm_master_destroy()
349 	drm_legacy_master_rmmaps(dev, master);  in drm_master_destroy()
351 	idr_destroy(&master->magic_map);  in drm_master_destroy()
352 	idr_destroy(&master->leases);  in drm_master_destroy()
353 	idr_destroy(&master->lessee_idr);  in drm_master_destroy()
355 	kfree(master->unique);  in drm_master_destroy()
356 	kfree(master);  in drm_master_destroy()
360  * drm_master_put - unreference and clear a master pointer
361  * @master: pointer to a pointer of &struct drm_master
363  * This decrements the &drm_master behind @master and sets it to NULL.
365 void drm_master_put(struct drm_master **master)  in drm_master_put()  argument
367 	kref_put(&(*master)->refcount, drm_master_destroy);  in drm_master_put()
368 	*master = NULL;  in drm_master_put()