f48bf7fb00
The notify handler does not change the list of adapters, it only triggers erp actions to open or shutdown the adapter. We don't need to hold the config semaphore and wait for the erp to complete. This is a prerequisite for a fix in the s390 common i/o code. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Martin Petermann <martin@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
222 lines
6.2 KiB
C
222 lines
6.2 KiB
C
/*
|
|
* zfcp device driver
|
|
*
|
|
* Registration and callback for the s390 common I/O layer.
|
|
*
|
|
* Copyright IBM Corporation 2002, 2008
|
|
*/
|
|
|
|
#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,
|
|
"Setup of data structures 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;
|
|
|
|
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, &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) {
|
|
if (atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
|
|
&unit->status))
|
|
scsi_remove_device(unit->device);
|
|
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)
|
|
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, 10, NULL,
|
|
ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
|
|
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
|
|
NULL);
|
|
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, 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, "device gone\n");
|
|
zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
|
|
break;
|
|
case CIO_NO_PATH:
|
|
dev_warn(&adapter->ccw_device->dev, "no path\n");
|
|
zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
|
|
break;
|
|
case CIO_OPER:
|
|
dev_info(&adapter->ccw_device->dev, "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);
|
|
}
|