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/*
* 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;
}
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