295 lines
8.0 KiB
C
295 lines
8.0 KiB
C
/*
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* This file is part of the zfcp device driver for
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* FCP adapters for IBM System z9 and zSeries.
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*
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* (C) Copyright IBM Corp. 2002, 2006
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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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#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_port_release - gets called when a struct device port 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_port_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_PORT_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 attributes for a port.
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*/
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#define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value) \
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static ssize_t zfcp_sysfs_port_##_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_port *port; \
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\
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port = 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_port_##_name##_show, NULL);
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ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
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ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
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(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
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ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
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(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
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/**
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* zfcp_sysfs_unit_add_store - add a unit to sysfs tree
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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 "unit_add" attribute of a port.
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*/
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static ssize_t
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zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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fcp_lun_t fcp_lun;
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char *endp;
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struct zfcp_port *port;
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struct zfcp_unit *unit;
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int retval = -EINVAL;
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down(&zfcp_data.config_sema);
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port = dev_get_drvdata(dev);
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if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
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retval = -EBUSY;
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goto out;
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}
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fcp_lun = simple_strtoull(buf, &endp, 0);
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if ((endp + 1) < (buf + count))
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goto out;
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unit = zfcp_unit_enqueue(port, fcp_lun);
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if (!unit)
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goto out;
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retval = 0;
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zfcp_erp_unit_reopen(unit, 0);
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zfcp_erp_wait(unit->port->adapter);
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zfcp_unit_put(unit);
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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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static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
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/**
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* zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
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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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static ssize_t
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zfcp_sysfs_unit_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct zfcp_port *port;
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struct zfcp_unit *unit;
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fcp_lun_t fcp_lun;
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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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port = dev_get_drvdata(dev);
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if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
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retval = -EBUSY;
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goto out;
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}
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fcp_lun = simple_strtoull(buf, &endp, 0);
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if ((endp + 1) < (buf + count)) {
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retval = -EINVAL;
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goto out;
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}
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write_lock_irq(&zfcp_data.config_lock);
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unit = zfcp_get_unit_by_lun(port, fcp_lun);
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if (unit && (atomic_read(&unit->refcount) == 0)) {
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zfcp_unit_get(unit);
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atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
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list_move(&unit->list, &port->unit_remove_lh);
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}
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else {
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unit = NULL;
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}
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write_unlock_irq(&zfcp_data.config_lock);
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if (!unit) {
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retval = -ENXIO;
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goto out;
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}
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zfcp_erp_unit_shutdown(unit, 0);
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zfcp_erp_wait(unit->port->adapter);
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zfcp_unit_put(unit);
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zfcp_unit_dequeue(unit);
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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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static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
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/**
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* zfcp_sysfs_port_failed_store - failed state of port
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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 port.
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* If a "0" gets written to "failed", error recovery will be
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* started for the belonging port.
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*/
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static ssize_t
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zfcp_sysfs_port_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_port *port;
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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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port = dev_get_drvdata(dev);
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if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->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_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
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zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
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zfcp_erp_wait(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_port_failed_show - failed state of port
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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 port. Will be
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* "0" if port is working, otherwise "1".
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*/
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static ssize_t
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zfcp_sysfs_port_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct zfcp_port *port;
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port = dev_get_drvdata(dev);
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if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->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_port_failed_show,
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zfcp_sysfs_port_failed_store);
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/**
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* zfcp_port_common_attrs
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* sysfs attributes that are common for all kind of fc ports.
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*/
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static struct attribute *zfcp_port_common_attrs[] = {
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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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NULL
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};
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static struct attribute_group zfcp_port_common_attr_group = {
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.attrs = zfcp_port_common_attrs,
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};
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/**
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* zfcp_port_no_ns_attrs
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* sysfs attributes not to be used for nameserver ports.
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*/
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static struct attribute *zfcp_port_no_ns_attrs[] = {
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&dev_attr_unit_add.attr,
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&dev_attr_unit_remove.attr,
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NULL
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};
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static struct attribute_group zfcp_port_no_ns_attr_group = {
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.attrs = zfcp_port_no_ns_attrs,
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};
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/**
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* zfcp_sysfs_port_create_files - create sysfs port 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 port.
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*/
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int
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zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
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{
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int retval;
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retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
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if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
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return retval;
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retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
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if (retval)
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sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
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return retval;
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}
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/**
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* zfcp_sysfs_port_remove_files - remove sysfs port 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 port.
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*/
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void
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zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
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{
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sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
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if (!(flags & ZFCP_STATUS_PORT_WKA))
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sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
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}
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#undef ZFCP_LOG_AREA
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