1 /*
2 * This file is part of the zfcp device driver for
3 * FCP adapters for IBM System z9 and zSeries.
4 *
5 * (C) Copyright IBM Corp. 2002, 2006
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include "zfcp_ext.h"
23
24 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
25
26 /**
27 * zfcp_sysfs_port_release - gets called when a struct device port is released
28 * @dev: pointer to belonging device
29 */
30 void
31 zfcp_sysfs_port_release(struct device *dev)
32 {
33 kfree(dev);
34 }
35
36 /**
37 * ZFCP_DEFINE_PORT_ATTR
38 * @_name: name of show attribute
39 * @_format: format string
40 * @_value: value to print
41 *
42 * Generates attributes for a port.
43 */
44 #define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value) \
45 static ssize_t zfcp_sysfs_port_##_name##_show(struct device *dev, struct device_attribute *attr, \
46 char *buf) \
47 { \
48 struct zfcp_port *port; \
49 \
50 port = dev_get_drvdata(dev); \
51 return sprintf(buf, _format, _value); \
52 } \
53 \
54 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
55
56 ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
57 ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
58 (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
59 ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
60 (ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
61
62 /**
63 * zfcp_sysfs_unit_add_store - add a unit to sysfs tree
64 * @dev: pointer to belonging device
65 * @buf: pointer to input buffer
66 * @count: number of bytes in buffer
67 *
68 * Store function of the "unit_add" attribute of a port.
69 */
70 static ssize_t
71 zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
72 {
73 fcp_lun_t fcp_lun;
74 char *endp;
75 struct zfcp_port *port;
76 struct zfcp_unit *unit;
77 int retval = -EINVAL;
78
79 down(&zfcp_data.config_sema);
80
81 port = dev_get_drvdata(dev);
82 if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
83 retval = -EBUSY;
84 goto out;
85 }
86
87 fcp_lun = simple_strtoull(buf, &endp, 0);
88 if ((endp + 1) < (buf + count))
89 goto out;
90
91 unit = zfcp_unit_enqueue(port, fcp_lun);
92 if (!unit)
93 goto out;
94
95 retval = 0;
96
97 zfcp_erp_unit_reopen(unit, 0);
98 zfcp_erp_wait(unit->port->adapter);
99 zfcp_unit_put(unit);
100 out:
101 up(&zfcp_data.config_sema);
102 return retval ? retval : (ssize_t) count;
103 }
104
105 static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
106
107 /**
108 * zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
109 * @dev: pointer to belonging device
110 * @buf: pointer to input buffer
111 * @count: number of bytes in buffer
112 */
113 static ssize_t
114 zfcp_sysfs_unit_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
115 {
116 struct zfcp_port *port;
117 struct zfcp_unit *unit;
118 fcp_lun_t fcp_lun;
119 char *endp;
120 int retval = 0;
121
122 down(&zfcp_data.config_sema);
123
124 port = dev_get_drvdata(dev);
125 if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
126 retval = -EBUSY;
127 goto out;
128 }
129
130 fcp_lun = simple_strtoull(buf, &endp, 0);
131 if ((endp + 1) < (buf + count)) {
132 retval = -EINVAL;
133 goto out;
134 }
135
136 write_lock_irq(&zfcp_data.config_lock);
137 unit = zfcp_get_unit_by_lun(port, fcp_lun);
138 if (unit && (atomic_read(&unit->refcount) == 0)) {
139 zfcp_unit_get(unit);
140 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
141 list_move(&unit->list, &port->unit_remove_lh);
142 }
143 else {
144 unit = NULL;
145 }
146 write_unlock_irq(&zfcp_data.config_lock);
147
148 if (!unit) {
149 retval = -ENXIO;
150 goto out;
151 }
152
153 zfcp_erp_unit_shutdown(unit, 0);
154 zfcp_erp_wait(unit->port->adapter);
155 zfcp_unit_put(unit);
156 zfcp_unit_dequeue(unit);
157 out:
158 up(&zfcp_data.config_sema);
159 return retval ? retval : (ssize_t) count;
160 }
161
162 static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
163
164 /**
165 * zfcp_sysfs_port_failed_store - failed state of port
166 * @dev: pointer to belonging device
167 * @buf: pointer to input buffer
168 * @count: number of bytes in buffer
169 *
170 * Store function of the "failed" attribute of a port.
171 * If a "" gets written to "failed", error recovery will be
172 * started for the belonging port.
173 */
174 static ssize_t
175 zfcp_sysfs_port_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
176 {
177 struct zfcp_port *port;
178 unsigned int val;
179 char *endp;
180 int retval = 0;
181
182 down(&zfcp_data.config_sema);
183
184 port = dev_get_drvdata(dev);
185 if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
186 retval = -EBUSY;
187 goto out;
188 }
189
190 val = simple_strtoul(buf, &endp, 0);
191 if (((endp + 1) < (buf + count)) || (val != 0)) {
192 retval = -EINVAL;
193 goto out;
194 }
195
196 zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
197 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
198 zfcp_erp_wait(port->adapter);
199 out:
200 up(&zfcp_data.config_sema);
201 return retval ? retval : (ssize_t) count;
202 }
203
204 /**
205 * zfcp_sysfs_port_failed_show - failed state of port
206 * @dev: pointer to belonging device
207 * @buf: pointer to input buffer
208 *
209 * Show function of "failed" attribute of port. Will be
210 * "" if port is working, otherwise "1".
211 */
212 static ssize_t
213 zfcp_sysfs_port_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
214 {
215 struct zfcp_port *port;
216
217 port = dev_get_drvdata(dev);
218 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
219 return sprintf(buf, "1\n");
220 else
221 return sprintf(buf, "\n");
222 }
223
224 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_port_failed_show,
225 zfcp_sysfs_port_failed_store);
226
227 /**
228 * zfcp_port_common_attrs
229 * sysfs attributes that are common for all kind of fc ports.
230 */
231 static struct attribute *zfcp_port_common_attrs[] = {
232 &dev_attr_failed.attr,
233 &dev_attr_in_recovery.attr,
234 &dev_attr_status.attr,
235 &dev_attr_access_denied.attr,
236 NULL
237 };
238
239 static struct attribute_group zfcp_port_common_attr_group = {
240 .attrs = zfcp_port_common_attrs,
241 };
242
243 /**
244 * zfcp_port_no_ns_attrs
245 * sysfs attributes not to be used for nameserver ports.
246 */
247 static struct attribute *zfcp_port_no_ns_attrs[] = {
248 &dev_attr_unit_add.attr,
249 &dev_attr_unit_remove.attr,
250 NULL
251 };
252
253 static struct attribute_group zfcp_port_no_ns_attr_group = {
254 .attrs = zfcp_port_no_ns_attrs,
255 };
256
257 /**
258 * zfcp_sysfs_port_create_files - create sysfs port files
259 * @dev: pointer to belonging device
260 *
261 * Create all attributes of the sysfs representation of a port.
262 */
263 int
264 zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
265 {
266 int retval;
267
268 retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
269
270 if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
271 return retval;
272
273 retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
274 if (retval)
275 sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
276
277 return retval;
278 }
279
280 /**
281 * zfcp_sysfs_port_remove_files - remove sysfs port files
282 * @dev: pointer to belonging device
283 *
284 * Remove all attributes of the sysfs representation of a port.
285 */
286 void
287 zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
288 {
289 sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
290 if (!(flags & ZFCP_STATUS_PORT_WKA))
291 sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
292 }
293
294 #undef ZFCP_LOG_AREA
295
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