Merge branch 'upstream' of git://lost.foo-projects.org/~ahkok/git/netdev-2.6 into...
[pandora-kernel.git] / drivers / s390 / scsi / zfcp_ccw.c
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 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