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)  in drm_lease_owner()  argument
76 	while (master->lessor != NULL)  in drm_lease_owner()
77 		master = master->lessor;  in drm_lease_owner()
78 	return master;  in drm_lease_owner()
82 _drm_find_lessee(struct drm_master *master, int lessee_id)  in _drm_find_lessee()  argument
84 	lockdep_assert_held(&master->dev->mode_config.idr_mutex);  in _drm_find_lessee()
85 	return idr_find(&drm_lease_owner(master)->lessee_idr, lessee_id);  in _drm_find_lessee()
88 static int _drm_lease_held_master(struct drm_master *master, int id)  in _drm_lease_held_master()  argument
90 	lockdep_assert_held(&master->dev->mode_config.idr_mutex);  in _drm_lease_held_master()
91 	if (master->lessor)  in _drm_lease_held_master()
92 		return idr_find(&master->leases, id) != NULL;  in _drm_lease_held_master()
97 static bool _drm_has_leased(struct drm_master *master, int id)  in _drm_has_leased()  argument
101 	lockdep_assert_held(&master->dev->mode_config.idr_mutex);  in _drm_has_leased()
102 	drm_for_each_lessee(lessee, master)  in _drm_has_leased()
112 	struct drm_master *master;  in _drm_lease_held()  local
117 	master = drm_file_get_master(file_priv);  in _drm_lease_held()
118 	if (!master)  in _drm_lease_held()
120 	ret = _drm_lease_held_master(master, id);  in _drm_lease_held()
121 	drm_master_put(&master);  in _drm_lease_held()
128 	struct drm_master *master;  in drm_lease_held()  local
134 	master = drm_file_get_master(file_priv);  in drm_lease_held()
135 	if (!master)  in drm_lease_held()
137 	if (!master->lessor) {  in drm_lease_held()
141 	mutex_lock(&master->dev->mode_config.idr_mutex);  in drm_lease_held()
142 	ret = _drm_lease_held_master(master, id);  in drm_lease_held()
143 	mutex_unlock(&master->dev->mode_config.idr_mutex);  in drm_lease_held()
146 	drm_master_put(&master);  in drm_lease_held()
156 	struct drm_master *master;  in drm_lease_filter_crtcs()  local
165 	master = drm_file_get_master(file_priv);  in drm_lease_filter_crtcs()
166 	if (!master)  in drm_lease_filter_crtcs()
168 	if (!master->lessor) {  in drm_lease_filter_crtcs()
172 	dev = master->dev;  in drm_lease_filter_crtcs()
175 	mutex_lock(&master->dev->mode_config.idr_mutex);  in drm_lease_filter_crtcs()
177 		if (_drm_lease_held_master(master, crtc->base.id)) {  in drm_lease_filter_crtcs()
189 	mutex_unlock(&master->dev->mode_config.idr_mutex);  in drm_lease_filter_crtcs()
192 	drm_master_put(&master);  in drm_lease_filter_crtcs()
201  * 	ERR_PTR(-EACCES)	some other master holds the title to any object
265 void drm_lease_destroy(struct drm_master *master)  in drm_lease_destroy()  argument
267 	struct drm_device *dev = master->dev;  in drm_lease_destroy()
271 	DRM_DEBUG_LEASE("drm_lease_destroy %d\n", master->lessee_id);  in drm_lease_destroy()
273 	/* This master is referenced by all lessees, hence it cannot be destroyed  in drm_lease_destroy()
276 	WARN_ON(!list_empty(&master->lessees));  in drm_lease_destroy()
278 	/* Remove this master from the lessee idr in the owner */  in drm_lease_destroy()
279 	if (master->lessee_id != 0) {  in drm_lease_destroy()
280 		DRM_DEBUG_LEASE("remove master %d from device list of lessees\n", master->lessee_id);  in drm_lease_destroy()
281 		idr_remove(&(drm_lease_owner(master)->lessee_idr), master->lessee_id);  in drm_lease_destroy()
284 	/* Remove this master from any lessee list it may be on */  in drm_lease_destroy()
285 	list_del(&master->lessee_list);  in drm_lease_destroy()
289 	if (master->lessor) {  in drm_lease_destroy()
290 		/* Tell the master to check the lessee list */  in drm_lease_destroy()
292 		drm_master_put(&master->lessor);  in drm_lease_destroy()
295 	DRM_DEBUG_LEASE("drm_lease_destroy done %d\n", master->lessee_id);  in drm_lease_destroy()
302 	struct drm_master *master = top;  in _drm_lease_revoke()  local
311 		DRM_DEBUG_LEASE("revoke leases for %p %d\n", master, master->lessee_id);  in _drm_lease_revoke()
314 		idr_for_each_entry(&master->leases, entry, object)  in _drm_lease_revoke()
315 			idr_remove(&master->leases, object);  in _drm_lease_revoke()
320 		if (!list_empty(&master->lessees)) {  in _drm_lease_revoke()
321 			master = list_first_entry(&master->lessees, struct drm_master, lessee_list);  in _drm_lease_revoke()
324 …while (master != top && master == list_last_entry(&master->lessor->lessees, struct drm_master, les…  in _drm_lease_revoke()
325 				master = master->lessor;  in _drm_lease_revoke()
327 			if (master == top)  in _drm_lease_revoke()
331 			master = list_next_entry(master, lessee_list);  in _drm_lease_revoke()
468  * The master associated with the specified file will have a lease
559 	/* Change the file to a master one */  in drm_mode_create_lease_ioctl()
560 	drm_master_put(&lessee_priv->master);  in drm_mode_create_lease_ioctl()
561 	lessee_priv->master = lessee;  in drm_mode_create_lease_ioctl()