drivers/s390/scsi/zfcp_ccw.c - linux - Git at Google

 /*
  * 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 ccw_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,
 	.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_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;
 	}

 	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:
 	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);
 	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 ccw_device *cdev)
 {
 	struct zfcp_adapter *adapter;

 	down(&zfcp_data.config_sema);
 	adapter = dev_get_drvdata(&cdev->dev);
 	zfcp_erp_adapter_shutdown(adapter, 0);
 	zfcp_erp_wait(adapter);
 	up(&zfcp_data.config_sema);
 }

 #undef ZFCP_LOG_AREA
	/*
	* 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 ccw_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,
	.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_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;
	}

	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:
	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);
	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 ccw_device *cdev)
	{
	struct zfcp_adapter *adapter;

	down(&zfcp_data.config_sema);
	adapter = dev_get_drvdata(&cdev->dev);
	zfcp_erp_adapter_shutdown(adapter, 0);
	zfcp_erp_wait(adapter);
	up(&zfcp_data.config_sema);
	}

	#undef ZFCP_LOG_AREA