180 lines
5.5 KiB
C
180 lines
5.5 KiB
C
/*
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* linux/drivers/s390/scsi/zfcp_sysfs_unit.c
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*
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* FCP adapter driver for IBM eServer zSeries
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*
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* sysfs unit related routines
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*
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* (C) Copyright IBM Corp. 2003, 2004
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*
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* Authors:
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* Martin Peschke <mpeschke@de.ibm.com>
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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* Andreas Herrmann <aherrman@de.ibm.com>
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* Volker Sameske <sameske@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define ZFCP_SYSFS_UNIT_C_REVISION "$Revision: 1.30 $"
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#include "zfcp_ext.h"
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#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
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/**
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* zfcp_sysfs_unit_release - gets called when a struct device unit is released
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* @dev: pointer to belonging device
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*/
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void
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zfcp_sysfs_unit_release(struct device *dev)
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{
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kfree(dev);
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}
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/**
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* ZFCP_DEFINE_UNIT_ATTR
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* @_name: name of show attribute
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* @_format: format string
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* @_value: value to print
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*
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* Generates attribute for a unit.
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*/
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#define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value) \
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static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev, struct device_attribute *attr, \
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char *buf) \
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{ \
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struct zfcp_unit *unit; \
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\
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unit = dev_get_drvdata(dev); \
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return sprintf(buf, _format, _value); \
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} \
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\
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static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL);
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ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status));
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ZFCP_DEFINE_UNIT_ATTR(scsi_lun, "0x%x\n", unit->scsi_lun);
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ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask
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(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
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ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask
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(ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status));
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ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask
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(ZFCP_STATUS_UNIT_SHARED, &unit->status));
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ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask
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(ZFCP_STATUS_UNIT_READONLY, &unit->status));
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/**
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* zfcp_sysfs_unit_failed_store - failed state of unit
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* @dev: pointer to belonging device
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* @buf: pointer to input buffer
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* @count: number of bytes in buffer
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*
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* Store function of the "failed" attribute of a unit.
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* If a "0" gets written to "failed", error recovery will be
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* started for the belonging unit.
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*/
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static ssize_t
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zfcp_sysfs_unit_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct zfcp_unit *unit;
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unsigned int val;
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char *endp;
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int retval = 0;
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down(&zfcp_data.config_sema);
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unit = dev_get_drvdata(dev);
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if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
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retval = -EBUSY;
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goto out;
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}
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val = simple_strtoul(buf, &endp, 0);
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if (((endp + 1) < (buf + count)) || (val != 0)) {
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retval = -EINVAL;
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goto out;
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}
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zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
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zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
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zfcp_erp_wait(unit->port->adapter);
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out:
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up(&zfcp_data.config_sema);
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return retval ? retval : (ssize_t) count;
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}
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/**
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* zfcp_sysfs_unit_failed_show - failed state of unit
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* @dev: pointer to belonging device
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* @buf: pointer to input buffer
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*
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* Show function of "failed" attribute of unit. Will be
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* "0" if unit is working, otherwise "1".
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*/
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static ssize_t
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zfcp_sysfs_unit_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct zfcp_unit *unit;
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unit = dev_get_drvdata(dev);
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if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
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return sprintf(buf, "1\n");
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else
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return sprintf(buf, "0\n");
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}
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static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
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zfcp_sysfs_unit_failed_store);
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static struct attribute *zfcp_unit_attrs[] = {
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&dev_attr_scsi_lun.attr,
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&dev_attr_failed.attr,
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&dev_attr_in_recovery.attr,
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&dev_attr_status.attr,
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&dev_attr_access_denied.attr,
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&dev_attr_access_shared.attr,
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&dev_attr_access_readonly.attr,
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NULL
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};
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static struct attribute_group zfcp_unit_attr_group = {
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.attrs = zfcp_unit_attrs,
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};
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/**
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* zfcp_sysfs_create_unit_files - create sysfs unit files
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* @dev: pointer to belonging device
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*
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* Create all attributes of the sysfs representation of a unit.
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*/
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int
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zfcp_sysfs_unit_create_files(struct device *dev)
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{
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return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
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}
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/**
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* zfcp_sysfs_remove_unit_files - remove sysfs unit files
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* @dev: pointer to belonging device
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*
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* Remove all attributes of the sysfs representation of a unit.
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*/
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void
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zfcp_sysfs_unit_remove_files(struct device *dev)
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{
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sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
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}
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#undef ZFCP_LOG_AREA
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