18  * - A device is connected to an lcu as long as the device exists.
20  *   device is checked by the eckd discipline and
22  *   before the device is deleted.
24  *   functions mark the point when a device is 'ready for service'.
28  * - dasd_alias_get_start_dev will find an alias device that can be used
29  *   instead of the base device and does some (very simple) load balancing.
173  * so this function must be called first for a new device.
178 int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)  in dasd_alias_make_device_known_to_lcu()  argument
180 	struct dasd_eckd_private *private = device->private;  in dasd_alias_make_device_known_to_lcu()
186 	device->discipline->get_uid(device, &uid);  in dasd_alias_make_device_known_to_lcu()
222 	list_add(&device->alias_list, &lcu->inactive_devices);  in dasd_alias_make_device_known_to_lcu()
231  * This function removes a device from the scope of alias management.
235 void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device)  in dasd_alias_disconnect_device_from_lcu()  argument
237 	struct dasd_eckd_private *private = device->private;  in dasd_alias_disconnect_device_from_lcu()
248 	device->discipline->get_uid(device, &uid);  in dasd_alias_disconnect_device_from_lcu()
250 	/* make sure that the workers don't use this device */  in dasd_alias_disconnect_device_from_lcu()
251 	if (device == lcu->suc_data.device) {  in dasd_alias_disconnect_device_from_lcu()
255 		if (device == lcu->suc_data.device) {  in dasd_alias_disconnect_device_from_lcu()
256 			dasd_put_device(device);  in dasd_alias_disconnect_device_from_lcu()
257 			lcu->suc_data.device = NULL;  in dasd_alias_disconnect_device_from_lcu()
261 	if (device == lcu->ruac_data.device) {  in dasd_alias_disconnect_device_from_lcu()
266 		if (device == lcu->ruac_data.device) {  in dasd_alias_disconnect_device_from_lcu()
267 			dasd_put_device(device);  in dasd_alias_disconnect_device_from_lcu()
268 			lcu->ruac_data.device = NULL;  in dasd_alias_disconnect_device_from_lcu()
276 	list_del_init(&device->alias_list);  in dasd_alias_disconnect_device_from_lcu()
299  * in the lcu is up to date and will update the device uid before
304 			      struct dasd_device *device,  in _add_device_to_lcu()  argument
308 	struct dasd_eckd_private *private = device->private;  in _add_device_to_lcu()
312 	spin_lock(get_ccwdev_lock(device->cdev));  in _add_device_to_lcu()
317 	spin_unlock(get_ccwdev_lock(device->cdev));  in _add_device_to_lcu()
320 		list_move(&device->alias_list, &lcu->active_devices);  in _add_device_to_lcu()
342 		list_move(&device->alias_list, &group->baselist);  in _add_device_to_lcu()
344 		list_move(&device->alias_list, &group->aliaslist);  in _add_device_to_lcu()
350 				    struct dasd_device *device)  in _remove_device_from_lcu()  argument
352 	struct dasd_eckd_private *private = device->private;  in _remove_device_from_lcu()
355 	list_move(&device->alias_list, &lcu->inactive_devices);  in _remove_device_from_lcu()
365 	if (group->next == device)  in _remove_device_from_lcu()
406 static int read_unit_address_configuration(struct dasd_device *device,  in read_unit_address_configuration()  argument
417 				   device, NULL);  in read_unit_address_configuration()
420 	cqr->startdev = device;  in read_unit_address_configuration()
421 	cqr->memdev = device;  in read_unit_address_configuration()
460 		/* suborder not supported or device unusable for IO */  in read_unit_address_configuration()
477 	struct dasd_device *device, *tempdev;  in _lcu_update()  local
483 		list_for_each_entry_safe(device, tempdev, &pavgroup->baselist,  in _lcu_update()
485 			list_move(&device->alias_list, &lcu->active_devices);  in _lcu_update()
486 			private = device->private;  in _lcu_update()
489 		list_for_each_entry_safe(device, tempdev, &pavgroup->aliaslist,  in _lcu_update()
491 			list_move(&device->alias_list, &lcu->active_devices);  in _lcu_update()
492 			private = device->private;  in _lcu_update()
508 	 * but especially do not add the device to an LCU with pending  in _lcu_update()
527 	list_for_each_entry_safe(device, tempdev, &lcu->active_devices,  in _lcu_update()
529 		_add_device_to_lcu(lcu, device, refdev);  in _lcu_update()
540 	struct dasd_device *device;  in lcu_update_work()  local
546 	device = ruac_data->device;  in lcu_update_work()
547 	rc = _lcu_update(device, lcu);  in lcu_update_work()
550 	 * prepare_update or a new device a new device while we were still  in lcu_update_work()
555 		DBF_DEV_EVENT(DBF_WARNING, device, "could not update"  in lcu_update_work()
558 			dasd_put_device(device);  in lcu_update_work()
560 		dasd_put_device(device);  in lcu_update_work()
561 		lcu->ruac_data.device = NULL;  in lcu_update_work()
568 				struct dasd_device *device)  in _schedule_lcu_update()  argument
574 	if (lcu->ruac_data.device) {  in _schedule_lcu_update()
578 	if (device && !list_empty(&device->alias_list))  in _schedule_lcu_update()
579 		usedev = device;  in _schedule_lcu_update()
598 	 * if we haven't found a proper device yet, give up for now, the next  in _schedule_lcu_update()
599 	 * device that will be set active will trigger an lcu update  in _schedule_lcu_update()
604 	lcu->ruac_data.device = usedev;  in _schedule_lcu_update()
610 int dasd_alias_add_device(struct dasd_device *device)  in dasd_alias_add_device()  argument
612 	struct dasd_eckd_private *private = device->private;  in dasd_alias_add_device()
621 	 * Check if device and lcu type differ. If so, the uac data may be  in dasd_alias_add_device()
626 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_add_device()
630 		rc = _add_device_to_lcu(lcu, device, device);  in dasd_alias_add_device()
635 		list_move(&device->alias_list, &lcu->active_devices);  in dasd_alias_add_device()
637 		_schedule_lcu_update(lcu, device);  in dasd_alias_add_device()
643 int dasd_alias_update_add_device(struct dasd_device *device)  in dasd_alias_update_add_device()  argument
645 	struct dasd_eckd_private *private = device->private;  in dasd_alias_update_add_device()
648 	return dasd_alias_add_device(device);  in dasd_alias_update_add_device()
651 int dasd_alias_remove_device(struct dasd_device *device)  in dasd_alias_remove_device()  argument
653 	struct dasd_eckd_private *private = device->private;  in dasd_alias_remove_device()
661 	_remove_device_from_lcu(lcu, device);  in dasd_alias_remove_device()
683 		 * use base device to do IO  in dasd_alias_get_start_dev()
727 				    struct dasd_device *device,  in reset_summary_unit_check()  argument
746 	cqr->startdev = device;  in reset_summary_unit_check()
747 	cqr->memdev = device;  in reset_summary_unit_check()
760 	struct dasd_device *device;  in _restart_all_base_devices_on_lcu()  local
764 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _restart_all_base_devices_on_lcu()
765 		private = device->private;  in _restart_all_base_devices_on_lcu()
768 		dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
769 		dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
771 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _restart_all_base_devices_on_lcu()
772 		private = device->private;  in _restart_all_base_devices_on_lcu()
775 		dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
776 		dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
779 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _restart_all_base_devices_on_lcu()
780 			dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
781 			dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
789 	struct dasd_device *device, *temp;  in flush_all_alias_devices_on_lcu()  local
806 	list_for_each_entry_safe(device, temp, &lcu->active_devices,  in flush_all_alias_devices_on_lcu()
808 		private = device->private;  in flush_all_alias_devices_on_lcu()
811 		list_move(&device->alias_list, &active);  in flush_all_alias_devices_on_lcu()
818 		device = list_first_entry(&active, struct dasd_device,  in flush_all_alias_devices_on_lcu()
821 		dasd_flush_device_queue(device);  in flush_all_alias_devices_on_lcu()
824 		 * only move device around if it wasn't moved away while we  in flush_all_alias_devices_on_lcu()
827 		if (device == list_first_entry(&active,  in flush_all_alias_devices_on_lcu()
829 			list_move(&device->alias_list, &lcu->active_devices);  in flush_all_alias_devices_on_lcu()
830 			private = device->private;  in flush_all_alias_devices_on_lcu()
840 	struct dasd_device *device;  in _stop_all_devices_on_lcu()  local
842 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _stop_all_devices_on_lcu()
843 		spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
844 		dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
845 		spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
847 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _stop_all_devices_on_lcu()
848 		spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
849 		dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
850 		spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
853 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _stop_all_devices_on_lcu()
854 			spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
855 			dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
856 			spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
858 		list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {  in _stop_all_devices_on_lcu()
859 			spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
860 			dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
861 			spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
869 	struct dasd_device *device;  in _unstop_all_devices_on_lcu()  local
871 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _unstop_all_devices_on_lcu()
872 		spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
873 		dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
874 		spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
876 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _unstop_all_devices_on_lcu()
877 		spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
878 		dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
879 		spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
882 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _unstop_all_devices_on_lcu()
883 			spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
884 			dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
885 			spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
887 		list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {  in _unstop_all_devices_on_lcu()
888 			spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
889 			dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
890 			spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
900 	struct dasd_device *device;  in summary_unit_check_handling_work()  local
905 	device = suc_data->device;  in summary_unit_check_handling_work()
911 	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);  in summary_unit_check_handling_work()
912 	dasd_device_remove_stop_bits(device,  in summary_unit_check_handling_work()
914 	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);  in summary_unit_check_handling_work()
915 	reset_summary_unit_check(lcu, device, suc_data->reason);  in summary_unit_check_handling_work()
921 	_schedule_lcu_update(lcu, device);  in summary_unit_check_handling_work()
922 	lcu->suc_data.device = NULL;  in summary_unit_check_handling_work()
923 	dasd_put_device(device);  in summary_unit_check_handling_work()
929 	struct dasd_device *device = container_of(work, struct dasd_device,  in dasd_alias_handle_summary_unit_check()  local
931 	struct dasd_eckd_private *private = device->private;  in dasd_alias_handle_summary_unit_check()
937 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
938 			    "device not ready to handle summary"  in dasd_alias_handle_summary_unit_check()
943 	/* If this device is about to be removed just return and wait for  in dasd_alias_handle_summary_unit_check()
944 	 * the next interrupt on a different device  in dasd_alias_handle_summary_unit_check()
946 	if (list_empty(&device->alias_list)) {  in dasd_alias_handle_summary_unit_check()
947 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
948 			    "device is in offline processing,"  in dasd_alias_handle_summary_unit_check()
952 	if (lcu->suc_data.device) {  in dasd_alias_handle_summary_unit_check()
954 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
963 	lcu->suc_data.device = device;  in dasd_alias_handle_summary_unit_check()
964 	dasd_get_device(device);  in dasd_alias_handle_summary_unit_check()
966 		dasd_put_device(device);  in dasd_alias_handle_summary_unit_check()
970 	clear_bit(DASD_FLAG_SUC, &device->flags);  in dasd_alias_handle_summary_unit_check()
971 	dasd_put_device(device);  in dasd_alias_handle_summary_unit_check()