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

 /*
  * zfcp device driver
  *
  * Registration and callback for the s390 common I/O layer.
  *
  * Copyright IBM Corporation 2002, 2008
  */

 #define KMSG_COMPONENT "zfcp"
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

 #include "zfcp_ext.h"

 /**
  * 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)
 {
 	int retval = 0;

 	down(&zfcp_data.config_sema);
 	if (zfcp_adapter_enqueue(ccw_device)) {
 		dev_err(&ccw_device->dev,
 			"Setting up data structures for the "
 			"FCP adapter failed\n");
 		retval = -EINVAL;
 	}
 	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;
 	LIST_HEAD(unit_remove_lh);
 	LIST_HEAD(port_remove_lh);

 	ccw_device_set_offline(ccw_device);
 	down(&zfcp_data.config_sema);
 	adapter = dev_get_drvdata(&ccw_device->dev);

 	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, &unit_remove_lh);
 			atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
 					&unit->status);
 		}
 		list_move(&port->list, &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, &port_remove_lh, list) {
 		list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
 			if (atomic_read(&unit->status) &
 			    ZFCP_STATUS_UNIT_REGISTERED)
 				scsi_remove_device(unit->device);
 			zfcp_unit_dequeue(unit);
 		}
 		zfcp_port_dequeue(port);
 	}
 	wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
 	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)
 		goto out;

 	/* initialize request counter */
 	BUG_ON(!zfcp_reqlist_isempty(adapter));
 	adapter->req_no = 0;

 	zfcp_erp_modify_adapter_status(adapter, 10, NULL,
 				       ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
 				NULL);
 	zfcp_erp_wait(adapter);
 	up(&zfcp_data.config_sema);
 	flush_work(&adapter->scan_work);
 	return 0;

  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, 86, NULL);
 	zfcp_erp_wait(adapter);
 	zfcp_erp_thread_kill(adapter);
 	up(&zfcp_data.config_sema);
 	return 0;
 }

 /**
  * zfcp_ccw_notify - ccw notify function
  * @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 = dev_get_drvdata(&ccw_device->dev);

 	switch (event) {
 	case CIO_GONE:
 		dev_warn(&adapter->ccw_device->dev,
 			 "The FCP device has been detached\n");
 		zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
 		break;
 	case CIO_NO_PATH:
 		dev_warn(&adapter->ccw_device->dev,
 			 "The CHPID for the FCP device is offline\n");
 		zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
 		break;
 	case CIO_OPER:
 		dev_info(&adapter->ccw_device->dev,
 			 "The FCP device is operational again\n");
 		zfcp_erp_modify_adapter_status(adapter, 11, NULL,
 					       ZFCP_STATUS_COMMON_RUNNING,
 					       ZFCP_SET);
 		zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 					89, NULL);
 		break;
 	}
 	return 1;
 }

 /**
  * zfcp_ccw_shutdown - handle shutdown from cio
  * @cdev: device for adapter to shutdown.
  */
 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, 90, NULL);
 	zfcp_erp_wait(adapter);
 	up(&zfcp_data.config_sema);
 }

 static struct ccw_device_id zfcp_ccw_device_id[] = {
 	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
 	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
 	{},
 };

 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);

 static struct ccw_driver zfcp_ccw_driver = {
 	.owner       = THIS_MODULE,
 	.name        = "zfcp",
 	.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,
 };

 /**
  * 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)
 {
 	return ccw_driver_register(&zfcp_ccw_driver);
 }

 /**
  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
  * @busid: bus id string of zfcp adapter to find
  */
 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
 {
 	struct ccw_device *ccw_device;
 	struct zfcp_adapter *adapter = NULL;

 	ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
 	if (ccw_device) {
 		adapter = dev_get_drvdata(&ccw_device->dev);
 		put_device(&ccw_device->dev);
 	}
 	return adapter;
 }
	/*
	* zfcp device driver
	*
	* Registration and callback for the s390 common I/O layer.
	*
	* Copyright IBM Corporation 2002, 2008
	*/

	#define KMSG_COMPONENT "zfcp"
	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

	#include "zfcp_ext.h"

	/**
	* 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)
	{
	int retval = 0;

	down(&zfcp_data.config_sema);
	if (zfcp_adapter_enqueue(ccw_device)) {
	dev_err(&ccw_device->dev,
	"Setting up data structures for the "
	"FCP adapter failed\n");
	retval = -EINVAL;
	}
	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;
	LIST_HEAD(unit_remove_lh);
	LIST_HEAD(port_remove_lh);

	ccw_device_set_offline(ccw_device);
	down(&zfcp_data.config_sema);
	adapter = dev_get_drvdata(&ccw_device->dev);

	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, &unit_remove_lh);
	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
	&unit->status);
	}
	list_move(&port->list, &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, &port_remove_lh, list) {
	list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
	if (atomic_read(&unit->status) &
	ZFCP_STATUS_UNIT_REGISTERED)
	scsi_remove_device(unit->device);
	zfcp_unit_dequeue(unit);
	}
	zfcp_port_dequeue(port);
	}
	wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
	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)
	goto out;

	/* initialize request counter */
	BUG_ON(!zfcp_reqlist_isempty(adapter));
	adapter->req_no = 0;

	zfcp_erp_modify_adapter_status(adapter, 10, NULL,
	ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
	NULL);
	zfcp_erp_wait(adapter);
	up(&zfcp_data.config_sema);
	flush_work(&adapter->scan_work);
	return 0;

	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, 86, NULL);
	zfcp_erp_wait(adapter);
	zfcp_erp_thread_kill(adapter);
	up(&zfcp_data.config_sema);
	return 0;
	}

	/**
	* zfcp_ccw_notify - ccw notify function
	* @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 = dev_get_drvdata(&ccw_device->dev);

	switch (event) {
	case CIO_GONE:
	dev_warn(&adapter->ccw_device->dev,
	"The FCP device has been detached\n");
	zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
	break;
	case CIO_NO_PATH:
	dev_warn(&adapter->ccw_device->dev,
	"The CHPID for the FCP device is offline\n");
	zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
	break;
	case CIO_OPER:
	dev_info(&adapter->ccw_device->dev,
	"The FCP device is operational again\n");
	zfcp_erp_modify_adapter_status(adapter, 11, NULL,
	ZFCP_STATUS_COMMON_RUNNING,
	ZFCP_SET);
	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
	89, NULL);
	break;
	}
	return 1;
	}

	/**
	* zfcp_ccw_shutdown - handle shutdown from cio
	* @cdev: device for adapter to shutdown.
	*/
	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, 90, NULL);
	zfcp_erp_wait(adapter);
	up(&zfcp_data.config_sema);
	}

	static struct ccw_device_id zfcp_ccw_device_id[] = {
	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
	{},
	};

	MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);

	static struct ccw_driver zfcp_ccw_driver = {
	.owner = THIS_MODULE,
	.name = "zfcp",
	.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,
	};

	/**
	* 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)
	{
	return ccw_driver_register(&zfcp_ccw_driver);
	}

	/**
	* zfcp_get_adapter_by_busid - find zfcp_adapter struct
	* @busid: bus id string of zfcp adapter to find
	*/
	struct zfcp_adapter zfcp_get_adapter_by_busid(char busid)
	{
	struct ccw_device *ccw_device;
	struct zfcp_adapter *adapter = NULL;

	ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
	if (ccw_device) {
	adapter = dev_get_drvdata(&ccw_device->dev);
	put_device(&ccw_device->dev);
	}
	return adapter;
	}