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

/*
 * 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
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/s390/scsi/zfcp_sysfs_port.c
	3	*
	4	* FCP adapter driver for IBM eServer zSeries
	5	*
	6	* sysfs port related routines
	7	*
	8	* (C) Copyright IBM Corp. 2003, 2004
	9	*
	10	* Authors:
	11	* Martin Peschke <mpeschke@de.ibm.com>
	12	* Heiko Carstens <heiko.carstens@de.ibm.com>
	13	* Andreas Herrmann <aherrman@de.ibm.com>
	14	* Volker Sameske <sameske@de.ibm.com>
	15	*
	16	* This program is free software; you can redistribute it and/or modify
	17	* it under the terms of the GNU General Public License as published by
	18	* the Free Software Foundation; either version 2, or (at your option)
	19	* any later version.
	20	*
	21	* This program is distributed in the hope that it will be useful,
	22	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	23	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	24	* GNU General Public License for more details.
	25	*
	26	* You should have received a copy of the GNU General Public License
	27	* along with this program; if not, write to the Free Software
	28	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	29	*/
	30
	31	#define ZFCP_SYSFS_PORT_C_REVISION "$Revision: 1.47 $"
	32
	33	#include "zfcp_ext.h"
	34
	35	#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
	36
	37	/**
	38	* zfcp_sysfs_port_release - gets called when a struct device port is released
	39	* @dev: pointer to belonging device
	40	*/
	41	void
	42	zfcp_sysfs_port_release(struct device *dev)
	43	{
	44	kfree(dev);
	45	}
	46
	47	/**
	48	* ZFCP_DEFINE_PORT_ATTR
	49	* @_name: name of show attribute
	50	* @_format: format string
	51	* @_value: value to print
	52	*
	53	* Generates attributes for a port.
	54	*/
	55	#define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value) \
10523b3b	56	static ssize_t zfcp_sysfs_port_##_name##_show(struct device dev, struct device_attribute attr, \
1da177e4 LT	57	char *buf) \
	58	{ \
	59	struct zfcp_port *port; \
	60	\
	61	port = dev_get_drvdata(dev); \
	62	return sprintf(buf, _format, _value); \
	63	} \
	64	\
	65	static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
	66
	67	ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
1da177e4 LT	68	ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
	69	(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
	70	ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
	71	(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
	72
	73	/**
	74	* zfcp_sysfs_unit_add_store - add a unit to sysfs tree
	75	* @dev: pointer to belonging device
	76	* @buf: pointer to input buffer
	77	* @count: number of bytes in buffer
	78	*
	79	* Store function of the "unit_add" attribute of a port.
	80	*/
	81	static ssize_t
10523b3b	82	zfcp_sysfs_unit_add_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	83	{
	84	fcp_lun_t fcp_lun;
	85	char *endp;
	86	struct zfcp_port *port;
	87	struct zfcp_unit *unit;
	88	int retval = -EINVAL;
	89
	90	down(&zfcp_data.config_sema);
	91
	92	port = dev_get_drvdata(dev);
	93	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	94	retval = -EBUSY;
	95	goto out;
	96	}
	97
	98	fcp_lun = simple_strtoull(buf, &endp, 0);
	99	if ((endp + 1) < (buf + count))
	100	goto out;
	101
	102	unit = zfcp_unit_enqueue(port, fcp_lun);
	103	if (!unit)
	104	goto out;
	105
	106	retval = 0;
	107
	108	zfcp_erp_unit_reopen(unit, 0);
	109	zfcp_erp_wait(unit->port->adapter);
	110	zfcp_unit_put(unit);
	111	out:
	112	up(&zfcp_data.config_sema);
	113	return retval ? retval : (ssize_t) count;
	114	}
	115
	116	static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
	117
	118	/**
	119	* zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
	120	* @dev: pointer to belonging device
	121	* @buf: pointer to input buffer
	122	* @count: number of bytes in buffer
	123	*/
	124	static ssize_t
10523b3b	125	zfcp_sysfs_unit_remove_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	126	{
	127	struct zfcp_port *port;
	128	struct zfcp_unit *unit;
	129	fcp_lun_t fcp_lun;
	130	char *endp;
	131	int retval = 0;
	132
	133	down(&zfcp_data.config_sema);
	134
	135	port = dev_get_drvdata(dev);
	136	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	137	retval = -EBUSY;
	138	goto out;
	139	}
	140
	141	fcp_lun = simple_strtoull(buf, &endp, 0);
	142	if ((endp + 1) < (buf + count)) {
	143	retval = -EINVAL;
	144	goto out;
	145	}
	146
	147	write_lock_irq(&zfcp_data.config_lock);
	148	unit = zfcp_get_unit_by_lun(port, fcp_lun);
	149	if (unit && (atomic_read(&unit->refcount) == 0)) {
	150	zfcp_unit_get(unit);
	151	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
	152	list_move(&unit->list, &port->unit_remove_lh);
	153	}
	154	else {
	155	unit = NULL;
	156	}
	157	write_unlock_irq(&zfcp_data.config_lock);
	158
	159	if (!unit) {
	160	retval = -ENXIO;
	161	goto out;
	162	}
	163
	164	zfcp_erp_unit_shutdown(unit, 0);
	165	zfcp_erp_wait(unit->port->adapter);
	166	zfcp_unit_put(unit);
	167	zfcp_unit_dequeue(unit);
	168	out:
	169	up(&zfcp_data.config_sema);
	170	return retval ? retval : (ssize_t) count;
	171	}
	172
	173	static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
	174
	175	/**
	176	* zfcp_sysfs_port_failed_store - failed state of port
	177	* @dev: pointer to belonging device
	178	* @buf: pointer to input buffer
	179	* @count: number of bytes in buffer
	180	*
	181	* Store function of the "failed" attribute of a port.
	182	* If a "0" gets written to "failed", error recovery will be
	183	* started for the belonging port.
	184	*/
	185	static ssize_t
10523b3b	186	zfcp_sysfs_port_failed_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	187	{
	188	struct zfcp_port *port;
	189	unsigned int val;
	190	char *endp;
	191	int retval = 0;
	192
	193	down(&zfcp_data.config_sema);
	194
	195	port = dev_get_drvdata(dev);
	196	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	197	retval = -EBUSY;
	198	goto out;
	199	}
	200
	201	val = simple_strtoul(buf, &endp, 0);
	202	if (((endp + 1) < (buf + count)) \|\| (val != 0)) {
	203	retval = -EINVAL;
	204	goto out;
	205	}
	206
	207	zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	208	zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
	209	zfcp_erp_wait(port->adapter);
	210	out:
	211	up(&zfcp_data.config_sema);
	212	return retval ? retval : (ssize_t) count;
	213	}
	214
	215	/**
	216	* zfcp_sysfs_port_failed_show - failed state of port
	217	* @dev: pointer to belonging device
	218	* @buf: pointer to input buffer
	219	*
	220	* Show function of "failed" attribute of port. Will be
	221	* "0" if port is working, otherwise "1".
	222	*/
	223	static ssize_t
10523b3b	224	zfcp_sysfs_port_failed_show(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	225	{
	226	struct zfcp_port *port;
	227
	228	port = dev_get_drvdata(dev);
	229	if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
	230	return sprintf(buf, "1\n");
	231	else
	232	return sprintf(buf, "0\n");
	233	}
	234
	235	static DEVICE_ATTR(failed, S_IWUSR \| S_IRUGO, zfcp_sysfs_port_failed_show,
	236	zfcp_sysfs_port_failed_store);
	237
	238	/**
	239	* zfcp_port_common_attrs
	240	* sysfs attributes that are common for all kind of fc ports.
	241	*/
	242	static struct attribute *zfcp_port_common_attrs[] = {
	243	&dev_attr_failed.attr,
	244	&dev_attr_in_recovery.attr,
	245	&dev_attr_status.attr,
1da177e4 LT	246	&dev_attr_access_denied.attr,
	247	NULL
	248	};
	249
	250	static struct attribute_group zfcp_port_common_attr_group = {
	251	.attrs = zfcp_port_common_attrs,
	252	};
	253
	254	/**
	255	* zfcp_port_no_ns_attrs
	256	* sysfs attributes not to be used for nameserver ports.
	257	*/
	258	static struct attribute *zfcp_port_no_ns_attrs[] = {
	259	&dev_attr_unit_add.attr,
	260	&dev_attr_unit_remove.attr,
1da177e4 LT	261	NULL
	262	};
	263
	264	static struct attribute_group zfcp_port_no_ns_attr_group = {
	265	.attrs = zfcp_port_no_ns_attrs,
	266	};
	267
	268	/**
	269	* zfcp_sysfs_port_create_files - create sysfs port files
	270	* @dev: pointer to belonging device
	271	*
	272	* Create all attributes of the sysfs representation of a port.
	273	*/
	274	int
	275	zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
	276	{
	277	int retval;
	278
	279	retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
	280
	281	if ((flags & ZFCP_STATUS_PORT_WKA) \|\| retval)
	282	return retval;
	283
	284	retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
	285	if (retval)
	286	sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
	287
	288	return retval;
	289	}
	290
	291	/**
	292	* zfcp_sysfs_port_remove_files - remove sysfs port files
	293	* @dev: pointer to belonging device
	294	*
	295	* Remove all attributes of the sysfs representation of a port.
	296	*/
	297	void
	298	zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
	299	{
	300	sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
	301	if (!(flags & ZFCP_STATUS_PORT_WKA))
	302	sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
	303	}
	304
	305	#undef ZFCP_LOG_AREA