gpu/drm/drm_lease.c

21  * DRM leases provide information about whether a DRM master may control a DRM
25  * The original DRM master of a device 'owns' the available drm resources. It
27  * to the new DRM master. This gives the new DRM master control over the
28  * leased resources until the owner revokes the lease, or the new DRM master
62  * through the SETMASTER or DROPMASTER IOCTL, so &drm_device.master points to
74 struct drm_master *drm_lease_owner(struct drm_master *master)
76 	while (master->lessor != NULL)
77 		master = master->lessor;
78 	return master;
82 _drm_find_lessee(struct drm_master *master, int lessee_id)
84 	lockdep_assert_held(&master->dev->mode_config.idr_mutex);
85 	return idr_find(&drm_lease_owner(master)->lessee_idr, lessee_id);
88 static int _drm_lease_held_master(struct drm_master *master, int id)
90 	lockdep_assert_held(&master->dev->mode_config.idr_mutex);
91 	if (master->lessor)
92 		return idr_find(&master->leases, id) != NULL;
97 static bool _drm_has_leased(struct drm_master *master, int id)
101 	lockdep_assert_held(&master->dev->mode_config.idr_mutex);
102 	drm_for_each_lessee(lessee, master)
112 	struct drm_master *master;
117 	master = drm_file_get_master(file_priv);
118 	if (!master)
120 	ret = _drm_lease_held_master(master, id);
121 	drm_master_put(&master);
128 	struct drm_master *master;
134 	master = drm_file_get_master(file_priv);
135 	if (!master)
137 	if (!master->lessor) {
141 	mutex_lock(&master->dev->mode_config.idr_mutex);
142 	ret = _drm_lease_held_master(master, id);
143 	mutex_unlock(&master->dev->mode_config.idr_mutex);
146 	drm_master_put(&master);
156 	struct drm_master *master;
165 	master = drm_file_get_master(file_priv);
166 	if (!master)
168 	if (!master->lessor) {
172 	dev = master->dev;
175 	mutex_lock(&master->dev->mode_config.idr_mutex);
177 		if (_drm_lease_held_master(master, crtc->base.id)) {
189 	mutex_unlock(&master->dev->mode_config.idr_mutex);
192 	drm_master_put(&master);
201  * 	ERR_PTR(-EACCES)	some other master holds the title to any object
266 void drm_lease_destroy(struct drm_master *master)
268 	struct drm_device *dev = master->dev;
272 	drm_dbg_lease(dev, "drm_lease_destroy %d\n", master->lessee_id);
274 	/* This master is referenced by all lessees, hence it cannot be destroyed
277 	WARN_ON(!list_empty(&master->lessees));
279 	/* Remove this master from the lessee idr in the owner */
280 	if (master->lessee_id != 0) {
281 		drm_dbg_lease(dev, "remove master %d from device list of lessees\n",
282 			      master->lessee_id);
283 		idr_remove(&(drm_lease_owner(master)->lessee_idr), master->lessee_id);
286 	/* Remove this master from any lessee list it may be on */
287 	list_del(&master->lessee_list);
291 	if (master->lessor) {
292 		/* Tell the master to check the lessee list */
294 		drm_master_put(&master->lessor);
297 	drm_dbg_lease(dev, "drm_lease_destroy done %d\n", master->lessee_id);
304 	struct drm_master *master = top;
313 		drm_dbg_lease(master->dev, "revoke leases for %p %d\n",
314 			      master, master->lessee_id);
317 		idr_for_each_entry(&master->leases, entry, object)
318 			idr_remove(&master->leases, object);
323 		if (!list_empty(&master->lessees)) {
324 			master = list_first_entry(&master->lessees, struct drm_master, lessee_list);
327 			while (master != top && master == list_last_entry(&master->lessor->lessees, struct drm_master, lessee_list))
328 				master = master->lessor;
330 			if (master == top)
334 			master = list_next_entry(master, lessee_list);
471  * The master associated with the specified file will have a lease
559 	/* Change the file to a master one */
560 	drm_master_put(&lessee_priv->master);
561 	lessee_priv->master = lessee;