drivers/s390/scsi/zfcp_sysfs_port.c - kernel/msm - Gitiles

 /*
  * 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,        \
                                               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(wwnn, "0x%016llx\n", port->wwnn);
 ZFCP_DEFINE_PORT_ATTR(d_id, "0x%06x\n", port->d_id);
 ZFCP_DEFINE_PORT_ATTR(scsi_id, "0x%x\n", port->scsi_id);
 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, 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, 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, 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, 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_wwnn.attr,
 	&dev_attr_d_id.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,
 	&dev_attr_scsi_id.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
	/*
	* 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, \
	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(wwnn, "0x%016llx\n", port->wwnn);
	ZFCP_DEFINE_PORT_ATTR(d_id, "0x%06x\n", port->d_id);
	ZFCP_DEFINE_PORT_ATTR(scsi_id, "0x%x\n", port->scsi_id);
	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, 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, 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, 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, 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_wwnn.attr,
	&dev_attr_d_id.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,
	&dev_attr_scsi_id.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