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1da177e4 | 1 | /* |
4a9d2d8b AH |
2 | * This file is part of the zfcp device driver for |
3 | * FCP adapters for IBM System z9 and zSeries. | |
1da177e4 | 4 | * |
4a9d2d8b | 5 | * (C) Copyright IBM Corp. 2002, 2006 |
1da177e4 LT |
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 | ||
1da177e4 LT |
22 | #include "zfcp_ext.h" |
23 | ||
24 | #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG | |
25 | ||
26 | static int zfcp_ccw_probe(struct ccw_device *); | |
27 | static void zfcp_ccw_remove(struct ccw_device *); | |
28 | static int zfcp_ccw_set_online(struct ccw_device *); | |
29 | static int zfcp_ccw_set_offline(struct ccw_device *); | |
30 | static int zfcp_ccw_notify(struct ccw_device *, int); | |
31 | static void zfcp_ccw_shutdown(struct device *); | |
32 | ||
33 | static struct ccw_device_id zfcp_ccw_device_id[] = { | |
34 | {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE, | |
35 | ZFCP_CONTROL_UNIT_MODEL, | |
36 | ZFCP_DEVICE_TYPE, | |
37 | ZFCP_DEVICE_MODEL)}, | |
38 | {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE, | |
39 | ZFCP_CONTROL_UNIT_MODEL, | |
40 | ZFCP_DEVICE_TYPE, | |
41 | ZFCP_DEVICE_MODEL_PRIV)}, | |
42 | {}, | |
43 | }; | |
44 | ||
45 | static struct ccw_driver zfcp_ccw_driver = { | |
46 | .owner = THIS_MODULE, | |
47 | .name = ZFCP_NAME, | |
48 | .ids = zfcp_ccw_device_id, | |
49 | .probe = zfcp_ccw_probe, | |
50 | .remove = zfcp_ccw_remove, | |
51 | .set_online = zfcp_ccw_set_online, | |
52 | .set_offline = zfcp_ccw_set_offline, | |
53 | .notify = zfcp_ccw_notify, | |
54 | .driver = { | |
55 | .shutdown = zfcp_ccw_shutdown, | |
56 | }, | |
57 | }; | |
58 | ||
59 | MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id); | |
60 | ||
61 | /** | |
62 | * zfcp_ccw_probe - probe function of zfcp driver | |
63 | * @ccw_device: pointer to belonging ccw device | |
64 | * | |
65 | * This function gets called by the common i/o layer and sets up the initial | |
66 | * data structures for each fcp adapter, which was detected by the system. | |
67 | * Also the sysfs files for this adapter will be created by this function. | |
68 | * In addition the nameserver port will be added to the ports of the adapter | |
69 | * and its sysfs representation will be created too. | |
70 | */ | |
71 | static int | |
72 | zfcp_ccw_probe(struct ccw_device *ccw_device) | |
73 | { | |
74 | struct zfcp_adapter *adapter; | |
75 | int retval = 0; | |
76 | ||
77 | down(&zfcp_data.config_sema); | |
78 | adapter = zfcp_adapter_enqueue(ccw_device); | |
79 | if (!adapter) | |
80 | retval = -EINVAL; | |
81 | else | |
82 | ZFCP_LOG_DEBUG("Probed adapter %s\n", | |
83 | zfcp_get_busid_by_adapter(adapter)); | |
84 | up(&zfcp_data.config_sema); | |
85 | return retval; | |
86 | } | |
87 | ||
88 | /** | |
89 | * zfcp_ccw_remove - remove function of zfcp driver | |
90 | * @ccw_device: pointer to belonging ccw device | |
91 | * | |
92 | * This function gets called by the common i/o layer and removes an adapter | |
93 | * from the system. Task of this function is to get rid of all units and | |
94 | * ports that belong to this adapter. And in addition all resources of this | |
95 | * adapter will be freed too. | |
96 | */ | |
97 | static void | |
98 | zfcp_ccw_remove(struct ccw_device *ccw_device) | |
99 | { | |
100 | struct zfcp_adapter *adapter; | |
101 | struct zfcp_port *port, *p; | |
102 | struct zfcp_unit *unit, *u; | |
103 | ||
104 | ccw_device_set_offline(ccw_device); | |
105 | down(&zfcp_data.config_sema); | |
106 | adapter = dev_get_drvdata(&ccw_device->dev); | |
107 | ||
108 | ZFCP_LOG_DEBUG("Removing adapter %s\n", | |
109 | zfcp_get_busid_by_adapter(adapter)); | |
110 | write_lock_irq(&zfcp_data.config_lock); | |
111 | list_for_each_entry_safe(port, p, &adapter->port_list_head, list) { | |
112 | list_for_each_entry_safe(unit, u, &port->unit_list_head, list) { | |
113 | list_move(&unit->list, &port->unit_remove_lh); | |
114 | atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, | |
115 | &unit->status); | |
116 | } | |
117 | list_move(&port->list, &adapter->port_remove_lh); | |
118 | atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); | |
119 | } | |
120 | atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); | |
121 | write_unlock_irq(&zfcp_data.config_lock); | |
122 | ||
123 | list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) { | |
124 | list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) { | |
125 | zfcp_unit_dequeue(unit); | |
126 | } | |
127 | zfcp_port_dequeue(port); | |
128 | } | |
129 | zfcp_adapter_wait(adapter); | |
130 | zfcp_adapter_dequeue(adapter); | |
131 | ||
132 | up(&zfcp_data.config_sema); | |
133 | } | |
134 | ||
135 | /** | |
136 | * zfcp_ccw_set_online - set_online function of zfcp driver | |
137 | * @ccw_device: pointer to belonging ccw device | |
138 | * | |
139 | * This function gets called by the common i/o layer and sets an adapter | |
140 | * into state online. Setting an fcp device online means that it will be | |
141 | * registered with the SCSI stack, that the QDIO queues will be set up | |
142 | * and that the adapter will be opened (asynchronously). | |
143 | */ | |
144 | static int | |
145 | zfcp_ccw_set_online(struct ccw_device *ccw_device) | |
146 | { | |
147 | struct zfcp_adapter *adapter; | |
148 | int retval; | |
149 | ||
150 | down(&zfcp_data.config_sema); | |
151 | adapter = dev_get_drvdata(&ccw_device->dev); | |
152 | ||
153 | retval = zfcp_adapter_debug_register(adapter); | |
154 | if (retval) | |
155 | goto out; | |
156 | retval = zfcp_erp_thread_setup(adapter); | |
157 | if (retval) { | |
158 | ZFCP_LOG_INFO("error: start of error recovery thread for " | |
159 | "adapter %s failed\n", | |
160 | zfcp_get_busid_by_adapter(adapter)); | |
161 | goto out_erp_thread; | |
162 | } | |
163 | ||
164 | retval = zfcp_adapter_scsi_register(adapter); | |
165 | if (retval) | |
166 | goto out_scsi_register; | |
167 | zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING, | |
168 | ZFCP_SET); | |
169 | zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED); | |
170 | zfcp_erp_wait(adapter); | |
171 | goto out; | |
172 | ||
173 | out_scsi_register: | |
174 | zfcp_erp_thread_kill(adapter); | |
175 | out_erp_thread: | |
176 | zfcp_adapter_debug_unregister(adapter); | |
177 | out: | |
178 | up(&zfcp_data.config_sema); | |
179 | return retval; | |
180 | } | |
181 | ||
182 | /** | |
183 | * zfcp_ccw_set_offline - set_offline function of zfcp driver | |
184 | * @ccw_device: pointer to belonging ccw device | |
185 | * | |
186 | * This function gets called by the common i/o layer and sets an adapter | |
187 | * into state offline. Setting an fcp device offline means that it will be | |
188 | * unregistered from the SCSI stack and that the adapter will be shut down | |
189 | * asynchronously. | |
190 | */ | |
191 | static int | |
192 | zfcp_ccw_set_offline(struct ccw_device *ccw_device) | |
193 | { | |
194 | struct zfcp_adapter *adapter; | |
195 | ||
196 | down(&zfcp_data.config_sema); | |
197 | adapter = dev_get_drvdata(&ccw_device->dev); | |
198 | zfcp_erp_adapter_shutdown(adapter, 0); | |
199 | zfcp_erp_wait(adapter); | |
200 | zfcp_adapter_scsi_unregister(adapter); | |
201 | zfcp_erp_thread_kill(adapter); | |
202 | zfcp_adapter_debug_unregister(adapter); | |
203 | up(&zfcp_data.config_sema); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | /** | |
208 | * zfcp_ccw_notify | |
209 | * @ccw_device: pointer to belonging ccw device | |
210 | * @event: indicates if adapter was detached or attached | |
211 | * | |
212 | * This function gets called by the common i/o layer if an adapter has gone | |
213 | * or reappeared. | |
214 | */ | |
215 | static int | |
216 | zfcp_ccw_notify(struct ccw_device *ccw_device, int event) | |
217 | { | |
218 | struct zfcp_adapter *adapter; | |
219 | ||
220 | down(&zfcp_data.config_sema); | |
221 | adapter = dev_get_drvdata(&ccw_device->dev); | |
222 | switch (event) { | |
223 | case CIO_GONE: | |
224 | ZFCP_LOG_NORMAL("adapter %s: device gone\n", | |
225 | zfcp_get_busid_by_adapter(adapter)); | |
226 | debug_text_event(adapter->erp_dbf,1,"dev_gone"); | |
227 | zfcp_erp_adapter_shutdown(adapter, 0); | |
228 | break; | |
229 | case CIO_NO_PATH: | |
230 | ZFCP_LOG_NORMAL("adapter %s: no path\n", | |
231 | zfcp_get_busid_by_adapter(adapter)); | |
232 | debug_text_event(adapter->erp_dbf,1,"no_path"); | |
233 | zfcp_erp_adapter_shutdown(adapter, 0); | |
234 | break; | |
235 | case CIO_OPER: | |
236 | ZFCP_LOG_NORMAL("adapter %s: operational again\n", | |
237 | zfcp_get_busid_by_adapter(adapter)); | |
238 | debug_text_event(adapter->erp_dbf,1,"dev_oper"); | |
239 | zfcp_erp_modify_adapter_status(adapter, | |
240 | ZFCP_STATUS_COMMON_RUNNING, | |
241 | ZFCP_SET); | |
242 | zfcp_erp_adapter_reopen(adapter, | |
243 | ZFCP_STATUS_COMMON_ERP_FAILED); | |
244 | break; | |
245 | } | |
246 | zfcp_erp_wait(adapter); | |
247 | up(&zfcp_data.config_sema); | |
248 | return 1; | |
249 | } | |
250 | ||
251 | /** | |
252 | * zfcp_ccw_register - ccw register function | |
253 | * | |
254 | * Registers the driver at the common i/o layer. This function will be called | |
255 | * at module load time/system start. | |
256 | */ | |
257 | int __init | |
258 | zfcp_ccw_register(void) | |
259 | { | |
260 | int retval; | |
261 | ||
262 | retval = ccw_driver_register(&zfcp_ccw_driver); | |
263 | if (retval) | |
264 | goto out; | |
265 | retval = zfcp_sysfs_driver_create_files(&zfcp_ccw_driver.driver); | |
266 | if (retval) | |
267 | ccw_driver_unregister(&zfcp_ccw_driver); | |
268 | out: | |
269 | return retval; | |
270 | } | |
271 | ||
272 | /** | |
273 | * zfcp_ccw_unregister - ccw unregister function | |
274 | * | |
275 | * Unregisters the driver from common i/o layer. Function will be called at | |
276 | * module unload/system shutdown. | |
277 | */ | |
278 | void __exit | |
279 | zfcp_ccw_unregister(void) | |
280 | { | |
281 | zfcp_sysfs_driver_remove_files(&zfcp_ccw_driver.driver); | |
282 | ccw_driver_unregister(&zfcp_ccw_driver); | |
283 | } | |
284 | ||
285 | /** | |
286 | * zfcp_ccw_shutdown - gets called on reboot/shutdown | |
287 | * | |
288 | * Makes sure that QDIO queues are down when the system gets stopped. | |
289 | */ | |
290 | static void | |
291 | zfcp_ccw_shutdown(struct device *dev) | |
292 | { | |
293 | struct zfcp_adapter *adapter; | |
294 | ||
295 | down(&zfcp_data.config_sema); | |
296 | adapter = dev_get_drvdata(dev); | |
297 | zfcp_erp_adapter_shutdown(adapter, 0); | |
298 | zfcp_erp_wait(adapter); | |
299 | up(&zfcp_data.config_sema); | |
300 | } | |
301 | ||
302 | #undef ZFCP_LOG_AREA |