259 lines
7.2 KiB
C
259 lines
7.2 KiB
C
/*
|
|
* zfcp device driver
|
|
*
|
|
* Registration and callback for the s390 common I/O layer.
|
|
*
|
|
* Copyright IBM Corporation 2002, 2009
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "zfcp"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include "zfcp_ext.h"
|
|
|
|
#define ZFCP_MODEL_PRIV 0x4
|
|
|
|
static struct ccw_device_id zfcp_ccw_device_id[] = {
|
|
{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
|
|
{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
|
|
|
|
/**
|
|
* zfcp_ccw_priv_sch - check if subchannel is privileged
|
|
* @adapter: Adapter/Subchannel to check
|
|
*/
|
|
int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
|
|
{
|
|
return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
|
|
}
|
|
|
|
/**
|
|
* 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 (unit->device)
|
|
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, "ccsonl1", NULL,
|
|
ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
|
|
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
|
|
"ccsonl2", 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, "ccsoff1", 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, "ccnoti1", 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, "ccnoti2", NULL);
|
|
break;
|
|
case CIO_OPER:
|
|
dev_info(&adapter->ccw_device->dev,
|
|
"The FCP device is operational again\n");
|
|
zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
|
|
ZFCP_STATUS_COMMON_RUNNING,
|
|
ZFCP_SET);
|
|
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
|
|
"ccnoti4", NULL);
|
|
break;
|
|
case CIO_BOXED:
|
|
dev_warn(&adapter->ccw_device->dev, "The FCP device "
|
|
"did not respond within the specified time\n");
|
|
zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", 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, "ccshut1", NULL);
|
|
zfcp_erp_wait(adapter);
|
|
up(&zfcp_data.config_sema);
|
|
}
|
|
|
|
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;
|
|
}
|