/*
* 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;
struct zfcp_port *port;
struct fc_port *rport;
down(&zfcp_data.config_sema);
adapter = dev_get_drvdata(&ccw_device->dev);
/* might be racy, but we cannot take config_lock due to the fact that
fc_remote_port_delete might sleep */
list_for_each_entry(port, &adapter->port_list_head, list)
if (port->rport) {
rport = port->rport;
port->rport = NULL;
fc_remote_port_delete(rport);
}
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
