26  * - A device is connected to an lcu as long as the device exists.
28  *   device is checked by the eckd discipline and
30  *   before the device is deleted.
32  *   functions mark the point when a device is 'ready for service'.
36  * - dasd_alias_get_start_dev will find an alias device that can be used
37  *   instead of the base device and does some (very simple) load balancing.
182  * so this function must be called first for a new device.
187 int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)  in dasd_alias_make_device_known_to_lcu()  argument
189 	struct dasd_eckd_private *private = device->private;  in dasd_alias_make_device_known_to_lcu()
195 	device->discipline->get_uid(device, &uid);  in dasd_alias_make_device_known_to_lcu()
231 	list_add(&device->alias_list, &lcu->inactive_devices);  in dasd_alias_make_device_known_to_lcu()
240  * This function removes a device from the scope of alias management.
244 void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device)  in dasd_alias_disconnect_device_from_lcu()  argument
246 	struct dasd_eckd_private *private = device->private;  in dasd_alias_disconnect_device_from_lcu()
257 	device->discipline->get_uid(device, &uid);  in dasd_alias_disconnect_device_from_lcu()
259 	list_del_init(&device->alias_list);  in dasd_alias_disconnect_device_from_lcu()
260 	/* make sure that the workers don't use this device */  in dasd_alias_disconnect_device_from_lcu()
261 	if (device == lcu->suc_data.device) {  in dasd_alias_disconnect_device_from_lcu()
265 		if (device == lcu->suc_data.device) {  in dasd_alias_disconnect_device_from_lcu()
266 			dasd_put_device(device);  in dasd_alias_disconnect_device_from_lcu()
267 			lcu->suc_data.device = NULL;  in dasd_alias_disconnect_device_from_lcu()
271 	if (device == lcu->ruac_data.device) {  in dasd_alias_disconnect_device_from_lcu()
276 		if (device == lcu->ruac_data.device) {  in dasd_alias_disconnect_device_from_lcu()
277 			dasd_put_device(device);  in dasd_alias_disconnect_device_from_lcu()
278 			lcu->ruac_data.device = NULL;  in dasd_alias_disconnect_device_from_lcu()
308  * in the lcu is up to date and will update the device uid before
313 			      struct dasd_device *device,  in _add_device_to_lcu()  argument
317 	struct dasd_eckd_private *private = device->private;  in _add_device_to_lcu()
321 	spin_lock(get_ccwdev_lock(device->cdev));  in _add_device_to_lcu()
326 	spin_unlock(get_ccwdev_lock(device->cdev));  in _add_device_to_lcu()
329 		list_move(&device->alias_list, &lcu->active_devices);  in _add_device_to_lcu()
351 		list_move(&device->alias_list, &group->baselist);  in _add_device_to_lcu()
353 		list_move(&device->alias_list, &group->aliaslist);  in _add_device_to_lcu()
359 				    struct dasd_device *device)  in _remove_device_from_lcu()  argument
361 	struct dasd_eckd_private *private = device->private;  in _remove_device_from_lcu()
364 	list_move(&device->alias_list, &lcu->inactive_devices);  in _remove_device_from_lcu()
374 	if (group->next == device)  in _remove_device_from_lcu()
415 static int read_unit_address_configuration(struct dasd_device *device,  in read_unit_address_configuration()  argument
426 				   device, NULL);  in read_unit_address_configuration()
429 	cqr->startdev = device;  in read_unit_address_configuration()
430 	cqr->memdev = device;  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()
520 	list_for_each_entry_safe(device, tempdev, &lcu->active_devices,  in _lcu_update()
522 		_add_device_to_lcu(lcu, device, refdev);  in _lcu_update()
532 	struct dasd_device *device;  in lcu_update_work()  local
538 	device = ruac_data->device;  in lcu_update_work()
539 	rc = _lcu_update(device, lcu);  in lcu_update_work()
542 	 * prepare_update or a new device a new device while we were still  in lcu_update_work()
547 		DBF_DEV_EVENT(DBF_WARNING, device, "could not update"  in lcu_update_work()
550 			dasd_put_device(device);  in lcu_update_work()
552 		dasd_put_device(device);  in lcu_update_work()
553 		lcu->ruac_data.device = NULL;  in lcu_update_work()
560 				struct dasd_device *device)  in _schedule_lcu_update()  argument
566 	if (lcu->ruac_data.device) {  in _schedule_lcu_update()
570 	if (device && !list_empty(&device->alias_list))  in _schedule_lcu_update()
571 		usedev = device;  in _schedule_lcu_update()
590 	 * if we haven't found a proper device yet, give up for now, the next  in _schedule_lcu_update()
591 	 * device that will be set active will trigger an lcu update  in _schedule_lcu_update()
596 	lcu->ruac_data.device = usedev;  in _schedule_lcu_update()
602 int dasd_alias_add_device(struct dasd_device *device)  in dasd_alias_add_device()  argument
604 	struct dasd_eckd_private *private = device->private;  in dasd_alias_add_device()
613 	 * Check if device and lcu type differ. If so, the uac data may be  in dasd_alias_add_device()
618 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_add_device()
622 		rc = _add_device_to_lcu(lcu, device, device);  in dasd_alias_add_device()
627 		list_move(&device->alias_list, &lcu->active_devices);  in dasd_alias_add_device()
628 		_schedule_lcu_update(lcu, device);  in dasd_alias_add_device()
634 int dasd_alias_update_add_device(struct dasd_device *device)  in dasd_alias_update_add_device()  argument
636 	struct dasd_eckd_private *private = device->private;  in dasd_alias_update_add_device()
639 	return dasd_alias_add_device(device);  in dasd_alias_update_add_device()
642 int dasd_alias_remove_device(struct dasd_device *device)  in dasd_alias_remove_device()  argument
644 	struct dasd_eckd_private *private = device->private;  in dasd_alias_remove_device()
652 	_remove_device_from_lcu(lcu, device);  in dasd_alias_remove_device()
674 		 * use base device to do IO  in dasd_alias_get_start_dev()
713 				    struct dasd_device *device,  in reset_summary_unit_check()  argument
732 	cqr->startdev = device;  in reset_summary_unit_check()
733 	cqr->memdev = device;  in reset_summary_unit_check()
746 	struct dasd_device *device;  in _restart_all_base_devices_on_lcu()  local
750 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _restart_all_base_devices_on_lcu()
751 		private = device->private;  in _restart_all_base_devices_on_lcu()
754 		dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
755 		dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
757 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _restart_all_base_devices_on_lcu()
758 		private = device->private;  in _restart_all_base_devices_on_lcu()
761 		dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
762 		dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
765 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _restart_all_base_devices_on_lcu()
766 			dasd_schedule_block_bh(device->block);  in _restart_all_base_devices_on_lcu()
767 			dasd_schedule_device_bh(device);  in _restart_all_base_devices_on_lcu()
775 	struct dasd_device *device, *temp;  in flush_all_alias_devices_on_lcu()  local
792 	list_for_each_entry_safe(device, temp, &lcu->active_devices,  in flush_all_alias_devices_on_lcu()
794 		private = device->private;  in flush_all_alias_devices_on_lcu()
797 		list_move(&device->alias_list, &active);  in flush_all_alias_devices_on_lcu()
804 		device = list_first_entry(&active, struct dasd_device,  in flush_all_alias_devices_on_lcu()
807 		dasd_flush_device_queue(device);  in flush_all_alias_devices_on_lcu()
810 		 * only move device around if it wasn't moved away while we  in flush_all_alias_devices_on_lcu()
813 		if (device == list_first_entry(&active,  in flush_all_alias_devices_on_lcu()
815 			list_move(&device->alias_list, &lcu->active_devices);  in flush_all_alias_devices_on_lcu()
816 			private = device->private;  in flush_all_alias_devices_on_lcu()
826 	struct dasd_device *device;  in _stop_all_devices_on_lcu()  local
828 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _stop_all_devices_on_lcu()
829 		spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
830 		dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
831 		spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
833 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _stop_all_devices_on_lcu()
834 		spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
835 		dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
836 		spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
839 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _stop_all_devices_on_lcu()
840 			spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
841 			dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
842 			spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
844 		list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {  in _stop_all_devices_on_lcu()
845 			spin_lock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
846 			dasd_device_set_stop_bits(device, DASD_STOPPED_SU);  in _stop_all_devices_on_lcu()
847 			spin_unlock(get_ccwdev_lock(device->cdev));  in _stop_all_devices_on_lcu()
855 	struct dasd_device *device;  in _unstop_all_devices_on_lcu()  local
857 	list_for_each_entry(device, &lcu->active_devices, alias_list) {  in _unstop_all_devices_on_lcu()
858 		spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
859 		dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
860 		spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
862 	list_for_each_entry(device, &lcu->inactive_devices, alias_list) {  in _unstop_all_devices_on_lcu()
863 		spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
864 		dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
865 		spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
868 		list_for_each_entry(device, &pavgroup->baselist, alias_list) {  in _unstop_all_devices_on_lcu()
869 			spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
870 			dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
871 			spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
873 		list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {  in _unstop_all_devices_on_lcu()
874 			spin_lock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
875 			dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);  in _unstop_all_devices_on_lcu()
876 			spin_unlock(get_ccwdev_lock(device->cdev));  in _unstop_all_devices_on_lcu()
886 	struct dasd_device *device;  in summary_unit_check_handling_work()  local
891 	device = suc_data->device;  in summary_unit_check_handling_work()
897 	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);  in summary_unit_check_handling_work()
898 	dasd_device_remove_stop_bits(device,  in summary_unit_check_handling_work()
900 	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);  in summary_unit_check_handling_work()
901 	reset_summary_unit_check(lcu, device, suc_data->reason);  in summary_unit_check_handling_work()
907 	_schedule_lcu_update(lcu, device);  in summary_unit_check_handling_work()
908 	lcu->suc_data.device = NULL;  in summary_unit_check_handling_work()
909 	dasd_put_device(device);  in summary_unit_check_handling_work()
915 	struct dasd_device *device = container_of(work, struct dasd_device,  in dasd_alias_handle_summary_unit_check()  local
917 	struct dasd_eckd_private *private = device->private;  in dasd_alias_handle_summary_unit_check()
923 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
924 			    "device not ready to handle summary"  in dasd_alias_handle_summary_unit_check()
929 	/* If this device is about to be removed just return and wait for  in dasd_alias_handle_summary_unit_check()
930 	 * the next interrupt on a different device  in dasd_alias_handle_summary_unit_check()
932 	if (list_empty(&device->alias_list)) {  in dasd_alias_handle_summary_unit_check()
933 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
934 			    "device is in offline processing,"  in dasd_alias_handle_summary_unit_check()
938 	if (lcu->suc_data.device) {  in dasd_alias_handle_summary_unit_check()
940 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",  in dasd_alias_handle_summary_unit_check()
949 	lcu->suc_data.device = device;  in dasd_alias_handle_summary_unit_check()
950 	dasd_get_device(device);  in dasd_alias_handle_summary_unit_check()
952 		dasd_put_device(device);  in dasd_alias_handle_summary_unit_check()
956 	clear_bit(DASD_FLAG_SUC, &device->flags);  in dasd_alias_handle_summary_unit_check()
957 	dasd_put_device(device);  in dasd_alias_handle_summary_unit_check()