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OpenCloudOS-Kernel/drivers/s390/scsi/zfcp_sysfs_port.c

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/*
* linux/drivers/s390/scsi/zfcp_sysfs_port.c
*
* FCP adapter driver for IBM eServer zSeries
*
* sysfs port related routines
*
* (C) Copyright IBM Corp. 2003, 2004
*
* Authors:
* Martin Peschke <mpeschke@de.ibm.com>
* Heiko Carstens <heiko.carstens@de.ibm.com>
* Andreas Herrmann <aherrman@de.ibm.com>
* Volker Sameske <sameske@de.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define ZFCP_SYSFS_PORT_C_REVISION "$Revision: 1.47 $"
#include "zfcp_ext.h"
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
/**
* zfcp_sysfs_port_release - gets called when a struct device port is released
* @dev: pointer to belonging device
*/
void
zfcp_sysfs_port_release(struct device *dev)
{
kfree(dev);
}
/**
* ZFCP_DEFINE_PORT_ATTR
* @_name: name of show attribute
* @_format: format string
* @_value: value to print
*
* Generates attributes for a port.
*/
#define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value) \
static ssize_t zfcp_sysfs_port_##_name##_show(struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
struct zfcp_port *port; \
\
port = dev_get_drvdata(dev); \
return sprintf(buf, _format, _value); \
} \
\
static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
/**
* zfcp_sysfs_unit_add_store - add a unit to sysfs tree
* @dev: pointer to belonging device
* @buf: pointer to input buffer
* @count: number of bytes in buffer
*
* Store function of the "unit_add" attribute of a port.
*/
static ssize_t
zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
fcp_lun_t fcp_lun;
char *endp;
struct zfcp_port *port;
struct zfcp_unit *unit;
int retval = -EINVAL;
down(&zfcp_data.config_sema);
port = dev_get_drvdata(dev);
if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
retval = -EBUSY;
goto out;
}
fcp_lun = simple_strtoull(buf, &endp, 0);
if ((endp + 1) < (buf + count))
goto out;
unit = zfcp_unit_enqueue(port, fcp_lun);
if (!unit)
goto out;
retval = 0;
zfcp_erp_unit_reopen(unit, 0);
zfcp_erp_wait(unit->port->adapter);
zfcp_unit_put(unit);
out:
up(&zfcp_data.config_sema);
return retval ? retval : (ssize_t) count;
}
static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
/**
* zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
* @dev: pointer to belonging device
* @buf: pointer to input buffer
* @count: number of bytes in buffer
*/
static ssize_t
zfcp_sysfs_unit_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct zfcp_port *port;
struct zfcp_unit *unit;
fcp_lun_t fcp_lun;
char *endp;
int retval = 0;
down(&zfcp_data.config_sema);
port = dev_get_drvdata(dev);
if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
retval = -EBUSY;
goto out;
}
fcp_lun = simple_strtoull(buf, &endp, 0);
if ((endp + 1) < (buf + count)) {
retval = -EINVAL;
goto out;
}
write_lock_irq(&zfcp_data.config_lock);
unit = zfcp_get_unit_by_lun(port, fcp_lun);
if (unit && (atomic_read(&unit->refcount) == 0)) {
zfcp_unit_get(unit);
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
list_move(&unit->list, &port->unit_remove_lh);
}
else {
unit = NULL;
}
write_unlock_irq(&zfcp_data.config_lock);
if (!unit) {
retval = -ENXIO;
goto out;
}
zfcp_erp_unit_shutdown(unit, 0);
zfcp_erp_wait(unit->port->adapter);
zfcp_unit_put(unit);
zfcp_unit_dequeue(unit);
out:
up(&zfcp_data.config_sema);
return retval ? retval : (ssize_t) count;
}
static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
/**
* zfcp_sysfs_port_failed_store - failed state of port
* @dev: pointer to belonging device
* @buf: pointer to input buffer
* @count: number of bytes in buffer
*
* Store function of the "failed" attribute of a port.
* If a "0" gets written to "failed", error recovery will be
* started for the belonging port.
*/
static ssize_t
zfcp_sysfs_port_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct zfcp_port *port;
unsigned int val;
char *endp;
int retval = 0;
down(&zfcp_data.config_sema);
port = dev_get_drvdata(dev);
if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
retval = -EBUSY;
goto out;
}
val = simple_strtoul(buf, &endp, 0);
if (((endp + 1) < (buf + count)) || (val != 0)) {
retval = -EINVAL;
goto out;
}
zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
zfcp_erp_wait(port->adapter);
out:
up(&zfcp_data.config_sema);
return retval ? retval : (ssize_t) count;
}
/**
* zfcp_sysfs_port_failed_show - failed state of port
* @dev: pointer to belonging device
* @buf: pointer to input buffer
*
* Show function of "failed" attribute of port. Will be
* "0" if port is working, otherwise "1".
*/
static ssize_t
zfcp_sysfs_port_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct zfcp_port *port;
port = dev_get_drvdata(dev);
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
}
static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_port_failed_show,
zfcp_sysfs_port_failed_store);
/**
* zfcp_port_common_attrs
* sysfs attributes that are common for all kind of fc ports.
*/
static struct attribute *zfcp_port_common_attrs[] = {
&dev_attr_failed.attr,
&dev_attr_in_recovery.attr,
&dev_attr_status.attr,
&dev_attr_access_denied.attr,
NULL
};
static struct attribute_group zfcp_port_common_attr_group = {
.attrs = zfcp_port_common_attrs,
};
/**
* zfcp_port_no_ns_attrs
* sysfs attributes not to be used for nameserver ports.
*/
static struct attribute *zfcp_port_no_ns_attrs[] = {
&dev_attr_unit_add.attr,
&dev_attr_unit_remove.attr,
NULL
};
static struct attribute_group zfcp_port_no_ns_attr_group = {
.attrs = zfcp_port_no_ns_attrs,
};
/**
* zfcp_sysfs_port_create_files - create sysfs port files
* @dev: pointer to belonging device
*
* Create all attributes of the sysfs representation of a port.
*/
int
zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
{
int retval;
retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
return retval;
retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
if (retval)
sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
return retval;
}
/**
* zfcp_sysfs_port_remove_files - remove sysfs port files
* @dev: pointer to belonging device
*
* Remove all attributes of the sysfs representation of a port.
*/
void
zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
{
sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
if (!(flags & ZFCP_STATUS_PORT_WKA))
sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
}
#undef ZFCP_LOG_AREA
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