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Diffstat (limited to 'drivers/s390/scsi/zfcp_sysfs_unit.c')
-rw-r--r--drivers/s390/scsi/zfcp_sysfs_unit.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_sysfs_unit.c b/drivers/s390/scsi/zfcp_sysfs_unit.c
new file mode 100644
index 000000000000..87c0b461831f
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_sysfs_unit.c
@@ -0,0 +1,179 @@
1/*
2 * linux/drivers/s390/scsi/zfcp_sysfs_unit.c
3 *
4 * FCP adapter driver for IBM eServer zSeries
5 *
6 * sysfs unit 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_UNIT_C_REVISION "$Revision: 1.30 $"
32
33#include "zfcp_ext.h"
34
35#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
36
37/**
38 * zfcp_sysfs_unit_release - gets called when a struct device unit is released
39 * @dev: pointer to belonging device
40 */
41void
42zfcp_sysfs_unit_release(struct device *dev)
43{
44 kfree(dev);
45}
46
47/**
48 * ZFCP_DEFINE_UNIT_ATTR
49 * @_name: name of show attribute
50 * @_format: format string
51 * @_value: value to print
52 *
53 * Generates attribute for a unit.
54 */
55#define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value) \
56static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev, \
57 char *buf) \
58{ \
59 struct zfcp_unit *unit; \
60 \
61 unit = dev_get_drvdata(dev); \
62 return sprintf(buf, _format, _value); \
63} \
64 \
65static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL);
66
67ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status));
68ZFCP_DEFINE_UNIT_ATTR(scsi_lun, "0x%x\n", unit->scsi_lun);
69ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask
70 (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
71ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask
72 (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status));
73ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask
74 (ZFCP_STATUS_UNIT_SHARED, &unit->status));
75ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask
76 (ZFCP_STATUS_UNIT_READONLY, &unit->status));
77
78/**
79 * zfcp_sysfs_unit_failed_store - failed state of unit
80 * @dev: pointer to belonging device
81 * @buf: pointer to input buffer
82 * @count: number of bytes in buffer
83 *
84 * Store function of the "failed" attribute of a unit.
85 * If a "0" gets written to "failed", error recovery will be
86 * started for the belonging unit.
87 */
88static ssize_t
89zfcp_sysfs_unit_failed_store(struct device *dev, const char *buf, size_t count)
90{
91 struct zfcp_unit *unit;
92 unsigned int val;
93 char *endp;
94 int retval = 0;
95
96 down(&zfcp_data.config_sema);
97 unit = dev_get_drvdata(dev);
98 if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
99 retval = -EBUSY;
100 goto out;
101 }
102
103 val = simple_strtoul(buf, &endp, 0);
104 if (((endp + 1) < (buf + count)) || (val != 0)) {
105 retval = -EINVAL;
106 goto out;
107 }
108
109 zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
110 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
111 zfcp_erp_wait(unit->port->adapter);
112 out:
113 up(&zfcp_data.config_sema);
114 return retval ? retval : (ssize_t) count;
115}
116
117/**
118 * zfcp_sysfs_unit_failed_show - failed state of unit
119 * @dev: pointer to belonging device
120 * @buf: pointer to input buffer
121 *
122 * Show function of "failed" attribute of unit. Will be
123 * "0" if unit is working, otherwise "1".
124 */
125static ssize_t
126zfcp_sysfs_unit_failed_show(struct device *dev, char *buf)
127{
128 struct zfcp_unit *unit;
129
130 unit = dev_get_drvdata(dev);
131 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
132 return sprintf(buf, "1\n");
133 else
134 return sprintf(buf, "0\n");
135}
136
137static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
138 zfcp_sysfs_unit_failed_store);
139
140static struct attribute *zfcp_unit_attrs[] = {
141 &dev_attr_scsi_lun.attr,
142 &dev_attr_failed.attr,
143 &dev_attr_in_recovery.attr,
144 &dev_attr_status.attr,
145 &dev_attr_access_denied.attr,
146 &dev_attr_access_shared.attr,
147 &dev_attr_access_readonly.attr,
148 NULL
149};
150
151static struct attribute_group zfcp_unit_attr_group = {
152 .attrs = zfcp_unit_attrs,
153};
154
155/**
156 * zfcp_sysfs_create_unit_files - create sysfs unit files
157 * @dev: pointer to belonging device
158 *
159 * Create all attributes of the sysfs representation of a unit.
160 */
161int
162zfcp_sysfs_unit_create_files(struct device *dev)
163{
164 return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
165}
166
167/**
168 * zfcp_sysfs_remove_unit_files - remove sysfs unit files
169 * @dev: pointer to belonging device
170 *
171 * Remove all attributes of the sysfs representation of a unit.
172 */
173void
174zfcp_sysfs_unit_remove_files(struct device *dev)
175{
176 sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
177}
178
179#undef ZFCP_LOG_AREA
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 01:01:22 -0500