[mirror_ubuntu-artful-kernel.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(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, 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_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
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));
	68	ZFCP_DEFINE_PORT_ATTR(wwnn, "0x%016llx\n", port->wwnn);
	69	ZFCP_DEFINE_PORT_ATTR(d_id, "0x%06x\n", port->d_id);
	70	ZFCP_DEFINE_PORT_ATTR(scsi_id, "0x%x\n", port->scsi_id);
	71	ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
	72	(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
	73	ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
	74	(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
	75
	76	/**
	77	* zfcp_sysfs_unit_add_store - add a unit to sysfs tree
	78	* @dev: pointer to belonging device
	79	* @buf: pointer to input buffer
	80	* @count: number of bytes in buffer
	81	*
	82	* Store function of the "unit_add" attribute of a port.
	83	*/
	84	static ssize_t
10523b3b	85	zfcp_sysfs_unit_add_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	86	{
	87	fcp_lun_t fcp_lun;
	88	char *endp;
	89	struct zfcp_port *port;
	90	struct zfcp_unit *unit;
	91	int retval = -EINVAL;
	92
	93	down(&zfcp_data.config_sema);
	94
	95	port = dev_get_drvdata(dev);
	96	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	97	retval = -EBUSY;
	98	goto out;
	99	}
	100
	101	fcp_lun = simple_strtoull(buf, &endp, 0);
	102	if ((endp + 1) < (buf + count))
	103	goto out;
	104
	105	unit = zfcp_unit_enqueue(port, fcp_lun);
	106	if (!unit)
	107	goto out;
	108
	109	retval = 0;
	110
	111	zfcp_erp_unit_reopen(unit, 0);
	112	zfcp_erp_wait(unit->port->adapter);
	113	zfcp_unit_put(unit);
	114	out:
	115	up(&zfcp_data.config_sema);
	116	return retval ? retval : (ssize_t) count;
	117	}
	118
	119	static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
	120
	121	/**
	122	* zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
	123	* @dev: pointer to belonging device
	124	* @buf: pointer to input buffer
	125	* @count: number of bytes in buffer
	126	*/
	127	static ssize_t
10523b3b	128	zfcp_sysfs_unit_remove_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	129	{
	130	struct zfcp_port *port;
	131	struct zfcp_unit *unit;
	132	fcp_lun_t fcp_lun;
	133	char *endp;
	134	int retval = 0;
	135
	136	down(&zfcp_data.config_sema);
	137
	138	port = dev_get_drvdata(dev);
	139	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	140	retval = -EBUSY;
	141	goto out;
	142	}
	143
	144	fcp_lun = simple_strtoull(buf, &endp, 0);
	145	if ((endp + 1) < (buf + count)) {
	146	retval = -EINVAL;
	147	goto out;
	148	}
	149
	150	write_lock_irq(&zfcp_data.config_lock);
	151	unit = zfcp_get_unit_by_lun(port, fcp_lun);
	152	if (unit && (atomic_read(&unit->refcount) == 0)) {
	153	zfcp_unit_get(unit);
	154	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
	155	list_move(&unit->list, &port->unit_remove_lh);
	156	}
	157	else {
	158	unit = NULL;
	159	}
	160	write_unlock_irq(&zfcp_data.config_lock);
	161
	162	if (!unit) {
	163	retval = -ENXIO;
	164	goto out;
	165	}
	166
	167	zfcp_erp_unit_shutdown(unit, 0);
	168	zfcp_erp_wait(unit->port->adapter);
	169	zfcp_unit_put(unit);
	170	zfcp_unit_dequeue(unit);
	171	out:
	172	up(&zfcp_data.config_sema);
	173	return retval ? retval : (ssize_t) count;
	174	}
	175
	176	static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
	177
	178	/**
	179	* zfcp_sysfs_port_failed_store - failed state of port
	180	* @dev: pointer to belonging device
	181	* @buf: pointer to input buffer
	182	* @count: number of bytes in buffer
	183	*
	184	* Store function of the "failed" attribute of a port.
	185	* If a "0" gets written to "failed", error recovery will be
	186	* started for the belonging port.
	187	*/
	188	static ssize_t
10523b3b	189	zfcp_sysfs_port_failed_store(struct device dev, struct device_attribute attr, const char *buf, size_t count)
1da177e4 LT	190	{
	191	struct zfcp_port *port;
	192	unsigned int val;
	193	char *endp;
	194	int retval = 0;
	195
	196	down(&zfcp_data.config_sema);
	197
	198	port = dev_get_drvdata(dev);
	199	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
	200	retval = -EBUSY;
	201	goto out;
	202	}
	203
	204	val = simple_strtoul(buf, &endp, 0);
	205	if (((endp + 1) < (buf + count)) \|\| (val != 0)) {
	206	retval = -EINVAL;
	207	goto out;
	208	}
	209
	210	zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	211	zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
	212	zfcp_erp_wait(port->adapter);
	213	out:
	214	up(&zfcp_data.config_sema);
	215	return retval ? retval : (ssize_t) count;
	216	}
	217
	218	/**
	219	* zfcp_sysfs_port_failed_show - failed state of port
	220	* @dev: pointer to belonging device
	221	* @buf: pointer to input buffer
	222	*
	223	* Show function of "failed" attribute of port. Will be
	224	* "0" if port is working, otherwise "1".
	225	*/
	226	static ssize_t
10523b3b	227	zfcp_sysfs_port_failed_show(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	228	{
	229	struct zfcp_port *port;
	230
	231	port = dev_get_drvdata(dev);
	232	if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
	233	return sprintf(buf, "1\n");
	234	else
	235	return sprintf(buf, "0\n");
	236	}
	237
	238	static DEVICE_ATTR(failed, S_IWUSR \| S_IRUGO, zfcp_sysfs_port_failed_show,
	239	zfcp_sysfs_port_failed_store);
	240
	241	/**
	242	* zfcp_port_common_attrs
	243	* sysfs attributes that are common for all kind of fc ports.
	244	*/
	245	static struct attribute *zfcp_port_common_attrs[] = {
	246	&dev_attr_failed.attr,
	247	&dev_attr_in_recovery.attr,
	248	&dev_attr_status.attr,
	249	&dev_attr_wwnn.attr,
	250	&dev_attr_d_id.attr,
	251	&dev_attr_access_denied.attr,
	252	NULL
	253	};
	254
	255	static struct attribute_group zfcp_port_common_attr_group = {
	256	.attrs = zfcp_port_common_attrs,
	257	};
	258
	259	/**
	260	* zfcp_port_no_ns_attrs
	261	* sysfs attributes not to be used for nameserver ports.
	262	*/
	263	static struct attribute *zfcp_port_no_ns_attrs[] = {
	264	&dev_attr_unit_add.attr,
	265	&dev_attr_unit_remove.attr,
	266	&dev_attr_scsi_id.attr,
	267	NULL
	268	};
	269
	270	static struct attribute_group zfcp_port_no_ns_attr_group = {
	271	.attrs = zfcp_port_no_ns_attrs,
	272	};
	273
	274	/**
	275	* zfcp_sysfs_port_create_files - create sysfs port files
	276	* @dev: pointer to belonging device
	277	*
	278	* Create all attributes of the sysfs representation of a port.
	279	*/
	280	int
	281	zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
	282	{
	283	int retval;
	284
	285	retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
	286
	287	if ((flags & ZFCP_STATUS_PORT_WKA) \|\| retval)
	288	return retval;
	289
	290	retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
	291	if (retval)
292	sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
293
294	return retval;
295	}
296
297	/**
298	* zfcp_sysfs_port_remove_files - remove sysfs port files
299	* @dev: pointer to belonging device
300	*
301	* Remove all attributes of the sysfs representation of a port.
302	*/
303	void
304	zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
305	{
306	sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
307	if (!(flags & ZFCP_STATUS_PORT_WKA))
308	sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
309	}
310
311	#undef ZFCP_LOG_AREA