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1da177e4 LT |
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 | */ | |
41 | void | |
42 | zfcp_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) \ | |
56 | static 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 | \ | |
65 | static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL); | |
66 | ||
67 | ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status)); | |
68 | ZFCP_DEFINE_UNIT_ATTR(scsi_lun, "0x%x\n", unit->scsi_lun); | |
69 | ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask | |
70 | (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status)); | |
71 | ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask | |
72 | (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status)); | |
73 | ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask | |
74 | (ZFCP_STATUS_UNIT_SHARED, &unit->status)); | |
75 | ZFCP_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 | */ | |
88 | static ssize_t | |
89 | zfcp_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 | */ | |
125 | static ssize_t | |
126 | zfcp_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 | ||
137 | static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show, | |
138 | zfcp_sysfs_unit_failed_store); | |
139 | ||
140 | static 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 | ||
151 | static 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 | */ | |
161 | int | |
162 | zfcp_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 | */ | |
173 | void | |
174 | zfcp_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 |