Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6.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 ccw_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         .shutdown    = zfcp_ccw_shutdown,
55 };
56
57 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
58
59 /**
60  * zfcp_ccw_probe - probe function of zfcp driver
61  * @ccw_device: pointer to belonging ccw device
62  *
63  * This function gets called by the common i/o layer and sets up the initial
64  * data structures for each fcp adapter, which was detected by the system.
65  * Also the sysfs files for this adapter will be created by this function.
66  * In addition the nameserver port will be added to the ports of the adapter
67  * and its sysfs representation will be created too.
68  */
69 static int
70 zfcp_ccw_probe(struct ccw_device *ccw_device)
71 {
72         struct zfcp_adapter *adapter;
73         int retval = 0;
74
75         down(&zfcp_data.config_sema);
76         adapter = zfcp_adapter_enqueue(ccw_device);
77         if (!adapter)
78                 retval = -EINVAL;
79         else
80                 ZFCP_LOG_DEBUG("Probed adapter %s\n",
81                                zfcp_get_busid_by_adapter(adapter));
82         up(&zfcp_data.config_sema);
83         return retval;
84 }
85
86 /**
87  * zfcp_ccw_remove - remove function of zfcp driver
88  * @ccw_device: pointer to belonging ccw device
89  *
90  * This function gets called by the common i/o layer and removes an adapter
91  * from the system. Task of this function is to get rid of all units and
92  * ports that belong to this adapter. And in addition all resources of this
93  * adapter will be freed too.
94  */
95 static void
96 zfcp_ccw_remove(struct ccw_device *ccw_device)
97 {
98         struct zfcp_adapter *adapter;
99         struct zfcp_port *port, *p;
100         struct zfcp_unit *unit, *u;
101
102         ccw_device_set_offline(ccw_device);
103         down(&zfcp_data.config_sema);
104         adapter = dev_get_drvdata(&ccw_device->dev);
105
106         ZFCP_LOG_DEBUG("Removing adapter %s\n",
107                        zfcp_get_busid_by_adapter(adapter));
108         write_lock_irq(&zfcp_data.config_lock);
109         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
110                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
111                         list_move(&unit->list, &port->unit_remove_lh);
112                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
113                                         &unit->status);
114                 }
115                 list_move(&port->list, &adapter->port_remove_lh);
116                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
117         }
118         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
119         write_unlock_irq(&zfcp_data.config_lock);
120
121         list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) {
122                 list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) {
123                         zfcp_unit_dequeue(unit);
124                 }
125                 zfcp_port_dequeue(port);
126         }
127         zfcp_adapter_wait(adapter);
128         zfcp_adapter_dequeue(adapter);
129
130         up(&zfcp_data.config_sema);
131 }
132
133 /**
134  * zfcp_ccw_set_online - set_online function of zfcp driver
135  * @ccw_device: pointer to belonging ccw device
136  *
137  * This function gets called by the common i/o layer and sets an adapter
138  * into state online. Setting an fcp device online means that it will be
139  * registered with the SCSI stack, that the QDIO queues will be set up
140  * and that the adapter will be opened (asynchronously).
141  */
142 static int
143 zfcp_ccw_set_online(struct ccw_device *ccw_device)
144 {
145         struct zfcp_adapter *adapter;
146         int retval;
147
148         down(&zfcp_data.config_sema);
149         adapter = dev_get_drvdata(&ccw_device->dev);
150
151         retval = zfcp_erp_thread_setup(adapter);
152         if (retval) {
153                 ZFCP_LOG_INFO("error: start of error recovery thread for "
154                               "adapter %s failed\n",
155                               zfcp_get_busid_by_adapter(adapter));
156                 goto out;
157         }
158
159         retval = zfcp_adapter_scsi_register(adapter);
160         if (retval)
161                 goto out_scsi_register;
162
163         /* initialize request counter */
164         BUG_ON(!zfcp_reqlist_isempty(adapter));
165         adapter->req_no = 0;
166
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:
176         up(&zfcp_data.config_sema);
177         return retval;
178 }
179
180 /**
181  * zfcp_ccw_set_offline - set_offline function of zfcp driver
182  * @ccw_device: pointer to belonging ccw device
183  *
184  * This function gets called by the common i/o layer and sets an adapter
185  * into state offline.
186  */
187 static int
188 zfcp_ccw_set_offline(struct ccw_device *ccw_device)
189 {
190         struct zfcp_adapter *adapter;
191
192         down(&zfcp_data.config_sema);
193         adapter = dev_get_drvdata(&ccw_device->dev);
194         zfcp_erp_adapter_shutdown(adapter, 0);
195         zfcp_erp_wait(adapter);
196         zfcp_erp_thread_kill(adapter);
197         up(&zfcp_data.config_sema);
198         return 0;
199 }
200
201 /**
202  * zfcp_ccw_notify
203  * @ccw_device: pointer to belonging ccw device
204  * @event: indicates if adapter was detached or attached
205  *
206  * This function gets called by the common i/o layer if an adapter has gone
207  * or reappeared.
208  */
209 static int
210 zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
211 {
212         struct zfcp_adapter *adapter;
213
214         down(&zfcp_data.config_sema);
215         adapter = dev_get_drvdata(&ccw_device->dev);
216         switch (event) {
217         case CIO_GONE:
218                 ZFCP_LOG_NORMAL("adapter %s: device gone\n",
219                                 zfcp_get_busid_by_adapter(adapter));
220                 debug_text_event(adapter->erp_dbf,1,"dev_gone");
221                 zfcp_erp_adapter_shutdown(adapter, 0);
222                 break;
223         case CIO_NO_PATH:
224                 ZFCP_LOG_NORMAL("adapter %s: no path\n",
225                                 zfcp_get_busid_by_adapter(adapter));
226                 debug_text_event(adapter->erp_dbf,1,"no_path");
227                 zfcp_erp_adapter_shutdown(adapter, 0);
228                 break;
229         case CIO_OPER:
230                 ZFCP_LOG_NORMAL("adapter %s: operational again\n",
231                                 zfcp_get_busid_by_adapter(adapter));
232                 debug_text_event(adapter->erp_dbf,1,"dev_oper");
233                 zfcp_erp_modify_adapter_status(adapter,
234                                                ZFCP_STATUS_COMMON_RUNNING,
235                                                ZFCP_SET);
236                 zfcp_erp_adapter_reopen(adapter,
237                                         ZFCP_STATUS_COMMON_ERP_FAILED);
238                 break;
239         }
240         zfcp_erp_wait(adapter);
241         up(&zfcp_data.config_sema);
242         return 1;
243 }
244
245 /**
246  * zfcp_ccw_register - ccw register function
247  *
248  * Registers the driver at the common i/o layer. This function will be called
249  * at module load time/system start.
250  */
251 int __init
252 zfcp_ccw_register(void)
253 {
254         int retval;
255
256         retval = ccw_driver_register(&zfcp_ccw_driver);
257         if (retval)
258                 goto out;
259         retval = zfcp_sysfs_driver_create_files(&zfcp_ccw_driver.driver);
260         if (retval)
261                 ccw_driver_unregister(&zfcp_ccw_driver);
262  out:
263         return retval;
264 }
265
266 /**
267  * zfcp_ccw_shutdown - gets called on reboot/shutdown
268  *
269  * Makes sure that QDIO queues are down when the system gets stopped.
270  */
271 static void
272 zfcp_ccw_shutdown(struct ccw_device *cdev)
273 {
274         struct zfcp_adapter *adapter;
275
276         down(&zfcp_data.config_sema);
277         adapter = dev_get_drvdata(&cdev->dev);
278         zfcp_erp_adapter_shutdown(adapter, 0);
279         zfcp_erp_wait(adapter);
280         up(&zfcp_data.config_sema);
281 }
282
283 #undef ZFCP_LOG_AREA