aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/scsi/zfcp_sysfs_unit.c
blob: 87c0b461831fd516f06a4847f668f7574d1a60d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
 * linux/drivers/s390/scsi/zfcp_sysfs_unit.c
 *
 * FCP adapter driver for IBM eServer zSeries
 *
 * sysfs unit 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_UNIT_C_REVISION "$Revision: 1.30 $"

#include "zfcp_ext.h"

#define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG

/**
 * zfcp_sysfs_unit_release - gets called when a struct device unit is released
 * @dev: pointer to belonging device
 */
void
zfcp_sysfs_unit_release(struct device *dev)
{
	kfree(dev);
}

/**
 * ZFCP_DEFINE_UNIT_ATTR
 * @_name:   name of show attribute
 * @_format: format string
 * @_value:  value to print
 *
 * Generates attribute for a unit.
 */
#define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value)                    \
static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev,        \
                                              char *buf)                 \
{                                                                        \
        struct zfcp_unit *unit;                                          \
                                                                         \
        unit = dev_get_drvdata(dev);                                     \
        return sprintf(buf, _format, _value);                            \
}                                                                        \
                                                                         \
static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL);

ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status));
ZFCP_DEFINE_UNIT_ATTR(scsi_lun, "0x%x\n", unit->scsi_lun);
ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask
		      (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask
		      (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status));
ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask
		      (ZFCP_STATUS_UNIT_SHARED, &unit->status));
ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask
		      (ZFCP_STATUS_UNIT_READONLY, &unit->status));

/**
 * zfcp_sysfs_unit_failed_store - failed state of unit
 * @dev: pointer to belonging device
 * @buf: pointer to input buffer
 * @count: number of bytes in buffer
 *
 * Store function of the "failed" attribute of a unit.
 * If a "0" gets written to "failed", error recovery will be
 * started for the belonging unit.
 */
static ssize_t
zfcp_sysfs_unit_failed_store(struct device *dev, const char *buf, size_t count)
{
	struct zfcp_unit *unit;
	unsigned int val;
	char *endp;
	int retval = 0;

	down(&zfcp_data.config_sema);
	unit = dev_get_drvdata(dev);
	if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->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_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
	zfcp_erp_wait(unit->port->adapter);
 out:
	up(&zfcp_data.config_sema);
	return retval ? retval : (ssize_t) count;
}

/**
 * zfcp_sysfs_unit_failed_show - failed state of unit
 * @dev: pointer to belonging device
 * @buf: pointer to input buffer
 *
 * Show function of "failed" attribute of unit. Will be
 * "0" if unit is working, otherwise "1".
 */
static ssize_t
zfcp_sysfs_unit_failed_show(struct device *dev, char *buf)
{
	struct zfcp_unit *unit;

	unit = dev_get_drvdata(dev);
	if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
		return sprintf(buf, "1\n");
	else
		return sprintf(buf, "0\n");
}

static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
		   zfcp_sysfs_unit_failed_store);

static struct attribute *zfcp_unit_attrs[] = {
	&dev_attr_scsi_lun.attr,
	&dev_attr_failed.attr,
	&dev_attr_in_recovery.attr,
	&dev_attr_status.attr,
	&dev_attr_access_denied.attr,
	&dev_attr_access_shared.attr,
	&dev_attr_access_readonly.attr,
	NULL
};

static struct attribute_group zfcp_unit_attr_group = {
	.attrs = zfcp_unit_attrs,
};

/** 
 * zfcp_sysfs_create_unit_files - create sysfs unit files
 * @dev: pointer to belonging device
 *
 * Create all attributes of the sysfs representation of a unit.
 */
int
zfcp_sysfs_unit_create_files(struct device *dev)
{
	return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
}

/** 
 * zfcp_sysfs_remove_unit_files - remove sysfs unit files
 * @dev: pointer to belonging device
 *
 * Remove all attributes of the sysfs representation of a unit.
 */
void
zfcp_sysfs_unit_remove_files(struct device *dev)
{
	sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
}

#undef ZFCP_LOG_AREA