android_kernel_motorola_sm6225/drivers/s390/scsi/zfcp_ccw.c
Michael Loehr 9f28745a6b [SCSI] zfcp: IO stall after deleting and path checker changes after reenabling zfcp devices
IO stall after deleting and path checker changes after reenabling zfcp device

Setting one zfcp device offline using chccwdev in a multipath
environment and waiting will lead to IO stall on all paths.
After setting the zfcp device back online using chccwdev,
the devices with io stall will have a different path checker.
Devices corresponding to the deleted units are never freed.
This has the effect that 'slave_destroy' is never called and zfcp
still thinks that this unit is registered
(ZFCP_STATUS_UNIT_REGISTERED is still set). Hence the erp
routine is not called correctly and the unit is not enabled properly.

Do not delete rport and the sdev. Just set the host to block on
'offline'. Setting host online again will then remove the blocked status
and everything is fine again.

Signed-off-by: Michael Loehr <mloehr2@linux.vnet.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-05-16 10:01:38 -04:00

291 lines
8.2 KiB
C

/*
* This file is part of the zfcp device driver for
* FCP adapters for IBM System z9 and zSeries.
*
* (C) Copyright IBM Corp. 2002, 2006
*
* 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.
*/
#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;
/* initialize request counter */
BUG_ON(!zfcp_reqlist_isempty(adapter));
adapter->req_no = 0;
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.
*/
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_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_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