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