linux/drivers/s390/scsi/zfcp_ccw.c
Swen Schillig ea4a3a6ac4 [SCSI] zfcp: Redesign of the debug tracing final cleanup.
This patch is the final cleanup of the redesign from the zfcp tracing.
Structures and elements which were used by multiple areas of the
former debug tracing are now changed to the new scheme.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-12-21 12:24:46 -06:00

266 lines
7 KiB
C

/*
* zfcp device driver
*
* Registration and callback for the s390 common I/O layer.
*
* Copyright IBM Corporation 2002, 2010
*/
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include "zfcp_ext.h"
#include "zfcp_reqlist.h"
#define ZFCP_MODEL_PRIV 0x4
static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
{
struct zfcp_adapter *adapter;
unsigned long flags;
spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
adapter = dev_get_drvdata(&cdev->dev);
if (adapter)
kref_get(&adapter->ref);
spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
return adapter;
}
void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
{
unsigned long flags;
spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
kref_put(&adapter->ref, zfcp_adapter_release);
spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
}
static int zfcp_ccw_activate(struct ccw_device *cdev)
{
struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
if (!adapter)
return 0;
zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING);
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
"ccresu2");
zfcp_erp_wait(adapter);
flush_work(&adapter->scan_work);
zfcp_ccw_adapter_put(adapter);
return 0;
}
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
* @cdev: pointer to belonging ccw device
*
* This function gets called by the common i/o layer for each FCP
* device found on the current system. This is only a stub to make cio
* work: To only allocate adapter resources for devices actually used,
* the allocation is deferred to the first call to ccw_set_online.
*/
static int zfcp_ccw_probe(struct ccw_device *cdev)
{
return 0;
}
/**
* zfcp_ccw_remove - remove function of zfcp driver
* @cdev: 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 *cdev)
{
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(cdev);
adapter = zfcp_ccw_adapter_by_cdev(cdev);
if (!adapter)
return;
write_lock_irq(&adapter->port_list_lock);
list_for_each_entry_safe(port, p, &adapter->port_list, list) {
write_lock(&port->unit_list_lock);
list_for_each_entry_safe(unit, u, &port->unit_list, list)
list_move(&unit->list, &unit_remove_lh);
write_unlock(&port->unit_list_lock);
list_move(&port->list, &port_remove_lh);
}
write_unlock_irq(&adapter->port_list_lock);
zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */
list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
zfcp_device_unregister(&unit->dev, &zfcp_sysfs_unit_attrs);
list_for_each_entry_safe(port, p, &port_remove_lh, list)
zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs);
zfcp_adapter_unregister(adapter);
}
/**
* zfcp_ccw_set_online - set_online function of zfcp driver
* @cdev: pointer to belonging ccw device
*
* This function gets called by the common i/o layer and sets an
* adapter into state online. The first call will allocate all
* adapter resources that will be retained until the device is removed
* via zfcp_ccw_remove.
*
* 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.
*/
static int zfcp_ccw_set_online(struct ccw_device *cdev)
{
struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
if (!adapter) {
adapter = zfcp_adapter_enqueue(cdev);
if (IS_ERR(adapter)) {
dev_err(&cdev->dev,
"Setting up data structures for the "
"FCP adapter failed\n");
return PTR_ERR(adapter);
}
kref_get(&adapter->ref);
}
/* initialize request counter */
BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
adapter->req_no = 0;
zfcp_ccw_activate(cdev);
zfcp_ccw_adapter_put(adapter);
return 0;
}
/**
* zfcp_ccw_set_offline - set_offline function of zfcp driver
* @cdev: 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 *cdev)
{
struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
if (!adapter)
return 0;
zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1");
zfcp_erp_wait(adapter);
zfcp_ccw_adapter_put(adapter);
return 0;
}
/**
* zfcp_ccw_notify - ccw notify function
* @cdev: 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 *cdev, int event)
{
struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
if (!adapter)
return 1;
switch (event) {
case CIO_GONE:
dev_warn(&cdev->dev, "The FCP device has been detached\n");
zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1");
break;
case CIO_NO_PATH:
dev_warn(&cdev->dev,
"The CHPID for the FCP device is offline\n");
zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2");
break;
case CIO_OPER:
dev_info(&cdev->dev, "The FCP device is operational again\n");
zfcp_erp_set_adapter_status(adapter,
ZFCP_STATUS_COMMON_RUNNING);
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
"ccnoti4");
break;
case CIO_BOXED:
dev_warn(&cdev->dev, "The FCP device did not respond within "
"the specified time\n");
zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5");
break;
}
zfcp_ccw_adapter_put(adapter);
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 = zfcp_ccw_adapter_by_cdev(cdev);
if (!adapter)
return;
zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1");
zfcp_erp_wait(adapter);
zfcp_erp_thread_kill(adapter);
zfcp_ccw_adapter_put(adapter);
}
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,
.freeze = zfcp_ccw_set_offline,
.thaw = zfcp_ccw_activate,
.restore = zfcp_ccw_activate,
};