diff options
Diffstat (limited to 'drivers/s390/scsi/zfcp_ccw.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_ccw.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_ccw.c b/drivers/s390/scsi/zfcp_ccw.c new file mode 100644 index 00000000000..0fc46381fc2 --- /dev/null +++ b/drivers/s390/scsi/zfcp_ccw.c @@ -0,0 +1,312 @@ +/* + * linux/drivers/s390/scsi/zfcp_ccw.c + * + * FCP adapter driver for IBM eServer zSeries + * + * CCW driver related routines + * + * (C) Copyright IBM Corp. 2003, 2004 + * + * Authors: + * Martin Peschke <mpeschke@de.ibm.com> + * Heiko Carstens <heiko.carstens@de.ibm.com> + * Andreas Herrmann <aherrman@de.ibm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#define ZFCP_CCW_C_REVISION "$Revision: 1.58 $" + +#include "zfcp_ext.h" + +#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG + +static int zfcp_ccw_probe(struct ccw_device *); +static void zfcp_ccw_remove(struct ccw_device *); +static int zfcp_ccw_set_online(struct ccw_device *); +static int zfcp_ccw_set_offline(struct ccw_device *); +static int zfcp_ccw_notify(struct ccw_device *, int); +static void zfcp_ccw_shutdown(struct device *); + +static struct ccw_device_id zfcp_ccw_device_id[] = { + {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE, + ZFCP_CONTROL_UNIT_MODEL, + ZFCP_DEVICE_TYPE, + ZFCP_DEVICE_MODEL)}, + {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE, + ZFCP_CONTROL_UNIT_MODEL, + ZFCP_DEVICE_TYPE, + ZFCP_DEVICE_MODEL_PRIV)}, + {}, +}; + +static struct ccw_driver zfcp_ccw_driver = { + .owner = THIS_MODULE, + .name = ZFCP_NAME, + .ids = zfcp_ccw_device_id, + .probe = zfcp_ccw_probe, + .remove = zfcp_ccw_remove, + .set_online = zfcp_ccw_set_online, + .set_offline = zfcp_ccw_set_offline, + .notify = zfcp_ccw_notify, + .driver = { + .shutdown = zfcp_ccw_shutdown, + }, +}; + +MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id); + +/** + * zfcp_ccw_probe - probe function of zfcp driver + * @ccw_device: pointer to belonging ccw device + * + * This function gets called by the common i/o layer and sets up the initial + * data structures for each fcp adapter, which was detected by the system. + * Also the sysfs files for this adapter will be created by this function. + * In addition the nameserver port will be added to the ports of the adapter + * and its sysfs representation will be created too. + */ +static int +zfcp_ccw_probe(struct ccw_device *ccw_device) +{ + struct zfcp_adapter *adapter; + int retval = 0; + + down(&zfcp_data.config_sema); + adapter = zfcp_adapter_enqueue(ccw_device); + if (!adapter) + retval = -EINVAL; + else + ZFCP_LOG_DEBUG("Probed adapter %s\n", + zfcp_get_busid_by_adapter(adapter)); + up(&zfcp_data.config_sema); + return retval; +} + +/** + * zfcp_ccw_remove - remove function of zfcp driver + * @ccw_device: pointer to belonging ccw device + * + * This function gets called by the common i/o layer and removes an adapter + * from the system. Task of this function is to get rid of all units and + * ports that belong to this adapter. And in addition all resources of this + * adapter will be freed too. + */ +static void +zfcp_ccw_remove(struct ccw_device *ccw_device) +{ + struct zfcp_adapter *adapter; + struct zfcp_port *port, *p; + struct zfcp_unit *unit, *u; + + ccw_device_set_offline(ccw_device); + down(&zfcp_data.config_sema); + adapter = dev_get_drvdata(&ccw_device->dev); + + ZFCP_LOG_DEBUG("Removing adapter %s\n", + zfcp_get_busid_by_adapter(adapter)); + write_lock_irq(&zfcp_data.config_lock); + list_for_each_entry_safe(port, p, &adapter->port_list_head, list) { + list_for_each_entry_safe(unit, u, &port->unit_list_head, list) { + list_move(&unit->list, &port->unit_remove_lh); + atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, + &unit->status); + } + list_move(&port->list, &adapter->port_remove_lh); + atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); + } + atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); + write_unlock_irq(&zfcp_data.config_lock); + + list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) { + list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) { + zfcp_unit_dequeue(unit); + } + zfcp_port_dequeue(port); + } + zfcp_adapter_wait(adapter); + zfcp_adapter_dequeue(adapter); + + up(&zfcp_data.config_sema); +} + +/** + * zfcp_ccw_set_online - set_online function of zfcp driver + * @ccw_device: pointer to belonging ccw device + * + * This function gets called by the common i/o layer and sets an adapter + * into state online. Setting an fcp device online means that it will be + * registered with the SCSI stack, that the QDIO queues will be set up + * and that the adapter will be opened (asynchronously). + */ +static int +zfcp_ccw_set_online(struct ccw_device *ccw_device) +{ + struct zfcp_adapter *adapter; + int retval; + + down(&zfcp_data.config_sema); + adapter = dev_get_drvdata(&ccw_device->dev); + + retval = zfcp_adapter_debug_register(adapter); + if (retval) + goto out; + retval = zfcp_erp_thread_setup(adapter); + if (retval) { + ZFCP_LOG_INFO("error: start of error recovery thread for " + "adapter %s failed\n", + zfcp_get_busid_by_adapter(adapter)); + goto out_erp_thread; + } + + retval = zfcp_adapter_scsi_register(adapter); + if (retval) + goto out_scsi_register; + zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING, + ZFCP_SET); + zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED); + zfcp_erp_wait(adapter); + goto out; + + out_scsi_register: + zfcp_erp_thread_kill(adapter); + out_erp_thread: + zfcp_adapter_debug_unregister(adapter); + out: + up(&zfcp_data.config_sema); + return retval; +} + +/** + * zfcp_ccw_set_offline - set_offline function of zfcp driver + * @ccw_device: pointer to belonging ccw device + * + * This function gets called by the common i/o layer and sets an adapter + * into state offline. Setting an fcp device offline means that it will be + * unregistered from the SCSI stack and that the adapter will be shut down + * asynchronously. + */ +static int +zfcp_ccw_set_offline(struct ccw_device *ccw_device) +{ + struct zfcp_adapter *adapter; + + down(&zfcp_data.config_sema); + adapter = dev_get_drvdata(&ccw_device->dev); + zfcp_erp_adapter_shutdown(adapter, 0); + zfcp_erp_wait(adapter); + zfcp_adapter_scsi_unregister(adapter); + zfcp_erp_thread_kill(adapter); + zfcp_adapter_debug_unregister(adapter); + up(&zfcp_data.config_sema); + return 0; +} + +/** + * zfcp_ccw_notify + * @ccw_device: pointer to belonging ccw device + * @event: indicates if adapter was detached or attached + * + * This function gets called by the common i/o layer if an adapter has gone + * or reappeared. + */ +static int +zfcp_ccw_notify(struct ccw_device *ccw_device, int event) +{ + struct zfcp_adapter *adapter; + + down(&zfcp_data.config_sema); + adapter = dev_get_drvdata(&ccw_device->dev); + switch (event) { + case CIO_GONE: + ZFCP_LOG_NORMAL("adapter %s: device gone\n", + zfcp_get_busid_by_adapter(adapter)); + debug_text_event(adapter->erp_dbf,1,"dev_gone"); + zfcp_erp_adapter_shutdown(adapter, 0); + break; + case CIO_NO_PATH: + ZFCP_LOG_NORMAL("adapter %s: no path\n", + zfcp_get_busid_by_adapter(adapter)); + debug_text_event(adapter->erp_dbf,1,"no_path"); + zfcp_erp_adapter_shutdown(adapter, 0); + break; + case CIO_OPER: + ZFCP_LOG_NORMAL("adapter %s: operational again\n", + zfcp_get_busid_by_adapter(adapter)); + debug_text_event(adapter->erp_dbf,1,"dev_oper"); + zfcp_erp_modify_adapter_status(adapter, + ZFCP_STATUS_COMMON_RUNNING, + ZFCP_SET); + zfcp_erp_adapter_reopen(adapter, + ZFCP_STATUS_COMMON_ERP_FAILED); + break; + } + zfcp_erp_wait(adapter); + up(&zfcp_data.config_sema); + return 1; +} + +/** + * zfcp_ccw_register - ccw register function + * + * Registers the driver at the common i/o layer. This function will be called + * at module load time/system start. + */ +int __init +zfcp_ccw_register(void) +{ + int retval; + + retval = ccw_driver_register(&zfcp_ccw_driver); + if (retval) + goto out; + retval = zfcp_sysfs_driver_create_files(&zfcp_ccw_driver.driver); + if (retval) + ccw_driver_unregister(&zfcp_ccw_driver); + out: + return retval; +} + +/** + * zfcp_ccw_unregister - ccw unregister function + * + * Unregisters the driver from common i/o layer. Function will be called at + * module unload/system shutdown. + */ +void __exit +zfcp_ccw_unregister(void) +{ + zfcp_sysfs_driver_remove_files(&zfcp_ccw_driver.driver); + ccw_driver_unregister(&zfcp_ccw_driver); +} + +/** + * zfcp_ccw_shutdown - gets called on reboot/shutdown + * + * Makes sure that QDIO queues are down when the system gets stopped. + */ +static void +zfcp_ccw_shutdown(struct device *dev) +{ + struct zfcp_adapter *adapter; + + down(&zfcp_data.config_sema); + adapter = dev_get_drvdata(dev); + zfcp_erp_adapter_shutdown(adapter, 0); + zfcp_erp_wait(adapter); + up(&zfcp_data.config_sema); +} + +#undef ZFCP_LOG_AREA |