[linux.git] / drivers / s390 / scsi / zfcp_sysfs_port.c

/*
 * This file is part of the zfcp device driver for
 * FCP adapters for IBM System z9 and zSeries.
 *
 * (C) Copyright IBM Corp. 2002, 2006
 *
 * 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.
 */

#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
Commit	Line	Data
1da177e4	1	/*
4a9d2d8b AH	2	* This file is part of the zfcp device driver for
4a9d2d8b AH	3	* FCP adapters for IBM System z9 and zSeries.
1da177e4	4	*
4a9d2d8b	5	* (C) Copyright IBM Corp. 2002, 2006
1da177e4 LT	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2, or (at your option)
	10	* any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
1da177e4 LT	22	#include "zfcp_ext.h"
	23
	24	#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
	25
	26	/**
	27	* zfcp_sysfs_port_release - gets called when a struct device port is released
	28	* @dev: pointer to belonging device
	29	*/
	30	void
	31	zfcp_sysfs_port_release(struct device *dev)
	32	{
	33	kfree(dev);
	34	}
	35
	36	/**
	37	* ZFCP_DEFINE_PORT_ATTR
	38	* @_name: name of show attribute
	39	* @_format: format string
	40	* @_value: value to print
	41	*
	42	* Generates attributes for a port.
	43	*/
	44	#define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value) \
10523b3b	45	static ssize_t zfcp_sysfs_port_##_name##_show(struct device dev, struct device_attribute attr, \
1da177e4 LT	46	char *buf) \
	47	{ \
	48	struct zfcp_port *port; \
	49	\
	50	port = dev_get_drvdata(dev); \
	51	return sprintf(buf, _format, _value); \
	52	} \
	53	\
	54	static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
	55
	56	ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
1da177e4 LT	57	ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
	58	(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
	59	ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
	60	(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
	61
	62	/**
	63	* zfcp_sysfs_unit_add_store - add a unit to sysfs tree
	64	* @dev: pointer to belonging device
	65	* @buf: pointer to input buffer
	66	* @count: number of bytes in buffer
	67	*
	68	* Store function of the "unit_add" attribute of a port.
	69	*/
	70	static ssize_t
10523b3b	71	zfcp_sysfs_unit_add_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	72	{
	73	fcp_lun_t fcp_lun;
	74	char *endp;
	75	struct zfcp_port *port;
	76	struct zfcp_unit *unit;
	77	int retval = -EINVAL;
	78
	79	down(&zfcp_data.config_sema);
	80
	81	port = dev_get_drvdata(dev);
	82	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	83	retval = -EBUSY;
	84	goto out;
	85	}
	86
	87	fcp_lun = simple_strtoull(buf, &endp, 0);
	88	if ((endp + 1) < (buf + count))
	89	goto out;
	90
	91	unit = zfcp_unit_enqueue(port, fcp_lun);
	92	if (!unit)
	93	goto out;
	94
	95	retval = 0;
	96
	97	zfcp_erp_unit_reopen(unit, 0);
	98	zfcp_erp_wait(unit->port->adapter);
	99	zfcp_unit_put(unit);
	100	out:
	101	up(&zfcp_data.config_sema);
	102	return retval ? retval : (ssize_t) count;
	103	}
	104
	105	static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
	106
	107	/**
	108	* zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
	109	* @dev: pointer to belonging device
	110	* @buf: pointer to input buffer
	111	* @count: number of bytes in buffer
	112	*/
	113	static ssize_t
10523b3b	114	zfcp_sysfs_unit_remove_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	115	{
	116	struct zfcp_port *port;
	117	struct zfcp_unit *unit;
	118	fcp_lun_t fcp_lun;
	119	char *endp;
	120	int retval = 0;
	121
	122	down(&zfcp_data.config_sema);
	123
	124	port = dev_get_drvdata(dev);
	125	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	126	retval = -EBUSY;
	127	goto out;
	128	}
	129
	130	fcp_lun = simple_strtoull(buf, &endp, 0);
	131	if ((endp + 1) < (buf + count)) {
	132	retval = -EINVAL;
	133	goto out;
	134	}
	135
	136	write_lock_irq(&zfcp_data.config_lock);
	137	unit = zfcp_get_unit_by_lun(port, fcp_lun);
	138	if (unit && (atomic_read(&unit->refcount) == 0)) {
	139	zfcp_unit_get(unit);
	140	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
	141	list_move(&unit->list, &port->unit_remove_lh);
	142	}
	143	else {
	144	unit = NULL;
	145	}
	146	write_unlock_irq(&zfcp_data.config_lock);
	147
	148	if (!unit) {
	149	retval = -ENXIO;
	150	goto out;
	151	}
	152
	153	zfcp_erp_unit_shutdown(unit, 0);
	154	zfcp_erp_wait(unit->port->adapter);
	155	zfcp_unit_put(unit);
	156	zfcp_unit_dequeue(unit);
	157	out:
	158	up(&zfcp_data.config_sema);
	159	return retval ? retval : (ssize_t) count;
	160	}
	161
	162	static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
	163
	164	/**
	165	* zfcp_sysfs_port_failed_store - failed state of port
	166	* @dev: pointer to belonging device
	167	* @buf: pointer to input buffer
	168	* @count: number of bytes in buffer
	169	*
	170	* Store function of the "failed" attribute of a port.
	171	* If a "0" gets written to "failed", error recovery will be
	172	* started for the belonging port.
	173	*/
	174	static ssize_t
10523b3b	175	zfcp_sysfs_port_failed_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	176	{
	177	struct zfcp_port *port;
	178	unsigned int val;
	179	char *endp;
	180	int retval = 0;
	181
	182	down(&zfcp_data.config_sema);
	183
	184	port = dev_get_drvdata(dev);
	185	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	186	retval = -EBUSY;
	187	goto out;
	188	}
	189
	190	val = simple_strtoul(buf, &endp, 0);
	191	if (((endp + 1) < (buf + count)) \|\| (val != 0)) {
	192	retval = -EINVAL;
	193	goto out;
	194	}
	195
	196	zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	197	zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
	198	zfcp_erp_wait(port->adapter);
	199	out:
	200	up(&zfcp_data.config_sema);
	201	return retval ? retval : (ssize_t) count;
	202	}
	203
	204	/**
	205	* zfcp_sysfs_port_failed_show - failed state of port
	206	* @dev: pointer to belonging device
	207	* @buf: pointer to input buffer
	208	*
	209	* Show function of "failed" attribute of port. Will be
	210	* "0" if port is working, otherwise "1".
	211	*/
	212	static ssize_t
10523b3b	213	zfcp_sysfs_port_failed_show(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	214	{
	215	struct zfcp_port *port;
	216
	217	port = dev_get_drvdata(dev);
	218	if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
	219	return sprintf(buf, "1\n");
	220	else
	221	return sprintf(buf, "0\n");
	222	}
	223
	224	static DEVICE_ATTR(failed, S_IWUSR \| S_IRUGO, zfcp_sysfs_port_failed_show,
	225	zfcp_sysfs_port_failed_store);
	226
	227	/**
	228	* zfcp_port_common_attrs
	229	* sysfs attributes that are common for all kind of fc ports.
	230	*/
	231	static struct attribute *zfcp_port_common_attrs[] = {
	232	&dev_attr_failed.attr,
	233	&dev_attr_in_recovery.attr,
	234	&dev_attr_status.attr,
1da177e4 LT	235	&dev_attr_access_denied.attr,
	236	NULL
	237	};
	238
	239	static struct attribute_group zfcp_port_common_attr_group = {
	240	.attrs = zfcp_port_common_attrs,
	241	};
	242
	243	/**
	244	* zfcp_port_no_ns_attrs
	245	* sysfs attributes not to be used for nameserver ports.
	246	*/
	247	static struct attribute *zfcp_port_no_ns_attrs[] = {
	248	&dev_attr_unit_add.attr,
	249	&dev_attr_unit_remove.attr,
1da177e4 LT	250	NULL
	251	};
	252
	253	static struct attribute_group zfcp_port_no_ns_attr_group = {
	254	.attrs = zfcp_port_no_ns_attrs,
	255	};
	256
	257	/**
	258	* zfcp_sysfs_port_create_files - create sysfs port files
	259	* @dev: pointer to belonging device
	260	*
	261	* Create all attributes of the sysfs representation of a port.
	262	*/
	263	int
	264	zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
	265	{
	266	int retval;
	267
	268	retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
	269
	270	if ((flags & ZFCP_STATUS_PORT_WKA) \|\| retval)
	271	return retval;
	272
	273	retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
	274	if (retval)
	275	sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
	276
	277	return retval;
	278	}
	279
	280	/**
	281	* zfcp_sysfs_port_remove_files - remove sysfs port files
	282	* @dev: pointer to belonging device
	283	*
	284	* Remove all attributes of the sysfs representation of a port.
	285	*/
	286	void
	287	zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
	288	{
	289	sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
	290	if (!(flags & ZFCP_STATUS_PORT_WKA))
	291	sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
	292	}
	293
	294	#undef ZFCP_LOG_AREA