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.
174  * so this function must be called first for a new device.
179 int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)  in dasd_alias_make_device_known_to_lcu()  argument
181 	struct dasd_eckd_private *private = device->private;  in dasd_alias_make_device_known_to_lcu()
187 	device->discipline->get_uid(device, &uid);  in dasd_alias_make_device_known_to_lcu()
223 	list_add(&device->alias_list, &lcu->inactive_devices);  in dasd_alias_make_device_known_to_lcu()
232  * This function removes a device from the scope of alias management.
236 void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device)  in dasd_alias_disconnect_device_from_lcu()  argument
238 	struct dasd_eckd_private *private = device->private;  in dasd_alias_disconnect_device_from_lcu()
249 	device->discipline->get_uid(device, &uid);  in dasd_alias_disconnect_device_from_lcu()
251 	/* make sure that the workers don't use this device */  in dasd_alias_disconnect_device_from_lcu()
252 	if (device == lcu->suc_data.device) {  in dasd_alias_disconnect_device_from_lcu()
256 		if (device == lcu->suc_data.device) {  in dasd_alias_disconnect_device_from_lcu()
257 			dasd_put_device(device);  in dasd_alias_disconnect_device_from_lcu()
258 			lcu->suc_data.device = NULL;  in dasd_alias_disconnect_device_from_lcu()
262 	if (device == lcu->ruac_data.device) {  in dasd_alias_disconnect_device_from_lcu()
267 		if (device == lcu->ruac_data.device) {  in dasd_alias_disconnect_device_from_lcu()
268 			dasd_put_device(device);  in dasd_alias_disconnect_device_from_lcu()
269 			lcu->ruac_data.device = NULL;  in dasd_alias_disconnect_device_from_lcu()
277 	list_del_init(&device->alias_list);  in dasd_alias_disconnect_device_from_lcu()
300  * in the lcu is up to date and will update the device uid before
305 			      struct dasd_device *device,  in _add_device_to_lcu()  argument
309 	struct dasd_eckd_private *private = device->private;  in _add_device_to_lcu()
313 	spin_lock(get_ccwdev_lock(device->cdev));  in _add_device_to_lcu()
318 	spin_unlock(get_ccwdev_lock(device->cdev));  in _add_device_to_lcu()
321 		list_move(&device->alias_list, &lcu->active_devices);  in _add_device_to_lcu()
343 		list_move(&device->alias_list, &group->baselist);  in _add_device_to_lcu()
345 		list_move(&device->alias_list, &group->aliaslist);  in _add_device_to_lcu()
351 				    struct dasd_device *device)  in _remove_device_from_lcu()  argument
353 	struct dasd_eckd_private *private = device->private;  in _remove_device_from_lcu()
356 	list_move(&device->alias_list, &lcu->inactive_devices);  in _remove_device_from_lcu()
366 	if (group->next == device)  in _remove_device_from_lcu()
407 static int read_unit_address_configuration(struct dasd_device *device,  in read_unit_address_configuration()  argument
418 				   device, NULL);  in read_unit_address_configuration()
421 	cqr->startdev = device;  in read_unit_address_configuration()
422 	cqr->memdev = device;  in read_unit_address_configuration()
461 		/* suborder not supported or device unusable for IO */  in read_unit_address_configuration()
478 	struct dasd_device *device, *tempdev;  in _lcu_update()  local
484 		list_for_each_entry_safe(device, tempdev, &pavgroup->baselist,  in _lcu_update()
486 			list_move(&device->alias_list, &lcu->active_devices);  in _lcu_update()
487 			private = device->private;  in _lcu_update()
490 		list_for_each_entry_safe(device, tempdev, &pavgroup->aliaslist,  in _lcu_update()
492 			list_move(&device->alias_list, &lcu->active_devices);  in _lcu_update()
493 			private = device->private;  in _lcu_update()
509 	 * but especially do not add the device to an LCU with pending  in _lcu_update()
528 	list_for_each_entry_safe(device, tempdev, &lcu->active_devices,  in _lcu_update()
530 		_add_device_to_lcu(lcu, device, refdev);  in _lcu_update()
541 	struct dasd_device *device;  in lcu_update_work()  local
547 	device = ruac_data->device;  in lcu_update_work()
548 	rc = _lcu_update(device, lcu);  in lcu_update_work()
551 	 * prepare_update or a new device a new device while we were still  in lcu_update_work()
556 		DBF_DEV_EVENT(DBF_WARNING, device, "could not update"  in lcu_update_work()
559 			dasd_put_device(device);  in lcu_update_work()
561 		dasd_put_device(device);  in lcu_update_work()
562 		lcu->ruac_data.device = NULL;  in lcu_update_work()
569 				struct dasd_device *device)  in _schedule_lcu_update()  argument
575 	if (lcu->ruac_data.device) {  in _schedule_lcu_update()
579 	if (device && !list_empty(&device->alias_list))  in _schedule_lcu_update()
580 		usedev = device;  in _schedule_lcu_update()
599 	 * if we haven't found a proper device yet, give up for now, the next  in _schedule_lcu_update()
600 	 * device that will be set active will trigger an lcu update  in _schedule_lcu_update()
605 	lcu->ruac_data.device = usedev;  in _schedule_lcu_update()
611 int dasd_alias_add_device(struct dasd_device *device)  in dasd_alias_add_device()  argument
613 	struct dasd_eckd_private *private = device->private;  in dasd_alias_add_device()
622 	 * Check if device and lcu type differ. If so, the uac data may be  in dasd_alias_add_device()
627 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_add_device()
631 		rc = _add_device_to_lcu(lcu, device, device);  in dasd_alias_add_device()
636 		list_move(&device->alias_list, &lcu->active_devices);  in dasd_alias_add_device()
638 		_schedule_lcu_update(lcu, device);  in dasd_alias_add_device()
644 int dasd_alias_update_add_device(struct dasd_device *device)  in dasd_alias_update_add_device()  argument
646 	struct dasd_eckd_private *private = device->private;  in dasd_alias_update_add_device()
649 	return dasd_alias_add_device(device);  in dasd_alias_update_add_device()
652 int dasd_alias_remove_device(struct dasd_device *device)  in dasd_alias_remove_device()  argument
654 	struct dasd_eckd_private *private = device->private;  in dasd_alias_remove_device()
662 	_remove_device_from_lcu(lcu, device);  in dasd_alias_remove_device()
684 		 * use base device to do IO  in dasd_alias_get_start_dev()
728 				    struct dasd_device *device,  in reset_summary_unit_check()  argument
747 	cqr->startdev = device;  in reset_summary_unit_check()
748 	cqr->memdev = device;  in reset_summary_unit_check()
761 	struct dasd_device *device;  in _restart_all_base_devices_on_lcu()  local
765 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _restart_all_base_devices_on_lcu()
766 		private = device->private;  in _restart_all_base_devices_on_lcu()
769 		dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
770 		dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
772 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _restart_all_base_devices_on_lcu()
773 		private = device->private;  in _restart_all_base_devices_on_lcu()
776 		dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
777 		dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
780 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _restart_all_base_devices_on_lcu()
781 			dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
782 			dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
790 	struct dasd_device *device, *temp;  in flush_all_alias_devices_on_lcu()  local
807 	list_for_each_entry_safe(device, temp, &lcu->active_devices,  in flush_all_alias_devices_on_lcu()
809 		private = device->private;  in flush_all_alias_devices_on_lcu()
812 		list_move(&device->alias_list, &active);  in flush_all_alias_devices_on_lcu()
819 		device = list_first_entry(&active, struct dasd_device,  in flush_all_alias_devices_on_lcu()
822 		dasd_flush_device_queue(device);  in flush_all_alias_devices_on_lcu()
825 		 * only move device around if it wasn't moved away while we  in flush_all_alias_devices_on_lcu()
828 		if (device == list_first_entry(&active,  in flush_all_alias_devices_on_lcu()
830 			list_move(&device->alias_list, &lcu->active_devices);  in flush_all_alias_devices_on_lcu()
831 			private = device->private;  in flush_all_alias_devices_on_lcu()
841 	struct dasd_device *device;  in _stop_all_devices_on_lcu()  local
843 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _stop_all_devices_on_lcu()
844 		spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
845 		dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
846 		spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
848 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _stop_all_devices_on_lcu()
849 		spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
850 		dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
851 		spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
854 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _stop_all_devices_on_lcu()
855 			spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
856 			dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
857 			spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
859 		list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {  in _stop_all_devices_on_lcu()
860 			spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
861 			dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
862 			spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
870 	struct dasd_device *device;  in _unstop_all_devices_on_lcu()  local
872 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _unstop_all_devices_on_lcu()
873 		spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
874 		dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
875 		spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
877 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _unstop_all_devices_on_lcu()
878 		spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
879 		dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
880 		spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
883 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _unstop_all_devices_on_lcu()
884 			spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
885 			dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
886 			spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
888 		list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {  in _unstop_all_devices_on_lcu()
889 			spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
890 			dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
891 			spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
901 	struct dasd_device *device;  in summary_unit_check_handling_work()  local
906 	device = suc_data->device;  in summary_unit_check_handling_work()
912 	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);  in summary_unit_check_handling_work()
913 	dasd_device_remove_stop_bits(device,  in summary_unit_check_handling_work()
915 	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);  in summary_unit_check_handling_work()
916 	reset_summary_unit_check(lcu, device, suc_data->reason);  in summary_unit_check_handling_work()
922 	_schedule_lcu_update(lcu, device);  in summary_unit_check_handling_work()
923 	lcu->suc_data.device = NULL;  in summary_unit_check_handling_work()
924 	dasd_put_device(device);  in summary_unit_check_handling_work()
930 	struct dasd_device *device = container_of(work, struct dasd_device,  in dasd_alias_handle_summary_unit_check()  local
932 	struct dasd_eckd_private *private = device->private;  in dasd_alias_handle_summary_unit_check()
938 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
939 			    "device not ready to handle summary"  in dasd_alias_handle_summary_unit_check()
944 	/* If this device is about to be removed just return and wait for  in dasd_alias_handle_summary_unit_check()
945 	 * the next interrupt on a different device  in dasd_alias_handle_summary_unit_check()
947 	if (list_empty(&device->alias_list)) {  in dasd_alias_handle_summary_unit_check()
948 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
949 			    "device is in offline processing,"  in dasd_alias_handle_summary_unit_check()
953 	if (lcu->suc_data.device) {  in dasd_alias_handle_summary_unit_check()
955 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
964 	lcu->suc_data.device = device;  in dasd_alias_handle_summary_unit_check()
965 	dasd_get_device(device);  in dasd_alias_handle_summary_unit_check()
967 		dasd_put_device(device);  in dasd_alias_handle_summary_unit_check()
971 	clear_bit(DASD_FLAG_SUC, &device->flags);  in dasd_alias_handle_summary_unit_check()
972 	dasd_put_device(device);  in dasd_alias_handle_summary_unit_check()