Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
[linux-2.6] / drivers / s390 / scsi / zfcp_ccw.c
1 /*
2  * zfcp device driver
3  *
4  * Registration and callback for the s390 common I/O layer.
5  *
6  * Copyright IBM Corporation 2002, 2009
7  */
8
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include "zfcp_ext.h"
13
14 /**
15  * zfcp_ccw_probe - probe function of zfcp driver
16  * @ccw_device: pointer to belonging ccw device
17  *
18  * This function gets called by the common i/o layer and sets up the initial
19  * data structures for each fcp adapter, which was detected by the system.
20  * Also the sysfs files for this adapter will be created by this function.
21  * In addition the nameserver port will be added to the ports of the adapter
22  * and its sysfs representation will be created too.
23  */
24 static int zfcp_ccw_probe(struct ccw_device *ccw_device)
25 {
26         int retval = 0;
27
28         down(&zfcp_data.config_sema);
29         if (zfcp_adapter_enqueue(ccw_device)) {
30                 dev_err(&ccw_device->dev,
31                         "Setting up data structures for the "
32                         "FCP adapter failed\n");
33                 retval = -EINVAL;
34         }
35         up(&zfcp_data.config_sema);
36         return retval;
37 }
38
39 /**
40  * zfcp_ccw_remove - remove function of zfcp driver
41  * @ccw_device: pointer to belonging ccw device
42  *
43  * This function gets called by the common i/o layer and removes an adapter
44  * from the system. Task of this function is to get rid of all units and
45  * ports that belong to this adapter. And in addition all resources of this
46  * adapter will be freed too.
47  */
48 static void zfcp_ccw_remove(struct ccw_device *ccw_device)
49 {
50         struct zfcp_adapter *adapter;
51         struct zfcp_port *port, *p;
52         struct zfcp_unit *unit, *u;
53         LIST_HEAD(unit_remove_lh);
54         LIST_HEAD(port_remove_lh);
55
56         ccw_device_set_offline(ccw_device);
57         down(&zfcp_data.config_sema);
58         adapter = dev_get_drvdata(&ccw_device->dev);
59
60         write_lock_irq(&zfcp_data.config_lock);
61         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
62                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
63                         list_move(&unit->list, &unit_remove_lh);
64                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
65                                         &unit->status);
66                 }
67                 list_move(&port->list, &port_remove_lh);
68                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
69         }
70         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
71         write_unlock_irq(&zfcp_data.config_lock);
72
73         list_for_each_entry_safe(port, p, &port_remove_lh, list) {
74                 list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
75                         if (unit->device)
76                                 scsi_remove_device(unit->device);
77                         zfcp_unit_dequeue(unit);
78                 }
79                 zfcp_port_dequeue(port);
80         }
81         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
82         zfcp_adapter_dequeue(adapter);
83
84         up(&zfcp_data.config_sema);
85 }
86
87 /**
88  * zfcp_ccw_set_online - set_online function of zfcp driver
89  * @ccw_device: pointer to belonging ccw device
90  *
91  * This function gets called by the common i/o layer and sets an adapter
92  * into state online. Setting an fcp device online means that it will be
93  * registered with the SCSI stack, that the QDIO queues will be set up
94  * and that the adapter will be opened (asynchronously).
95  */
96 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
97 {
98         struct zfcp_adapter *adapter;
99         int retval;
100
101         down(&zfcp_data.config_sema);
102         adapter = dev_get_drvdata(&ccw_device->dev);
103
104         retval = zfcp_erp_thread_setup(adapter);
105         if (retval)
106                 goto out;
107
108         /* initialize request counter */
109         BUG_ON(!zfcp_reqlist_isempty(adapter));
110         adapter->req_no = 0;
111
112         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
113                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
114         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
115                                 "ccsonl2", NULL);
116         zfcp_erp_wait(adapter);
117         up(&zfcp_data.config_sema);
118         flush_work(&adapter->scan_work);
119         return 0;
120
121  out:
122         up(&zfcp_data.config_sema);
123         return retval;
124 }
125
126 /**
127  * zfcp_ccw_set_offline - set_offline function of zfcp driver
128  * @ccw_device: pointer to belonging ccw device
129  *
130  * This function gets called by the common i/o layer and sets an adapter
131  * into state offline.
132  */
133 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
134 {
135         struct zfcp_adapter *adapter;
136
137         down(&zfcp_data.config_sema);
138         adapter = dev_get_drvdata(&ccw_device->dev);
139         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
140         zfcp_erp_wait(adapter);
141         zfcp_erp_thread_kill(adapter);
142         up(&zfcp_data.config_sema);
143         return 0;
144 }
145
146 /**
147  * zfcp_ccw_notify - ccw notify function
148  * @ccw_device: pointer to belonging ccw device
149  * @event: indicates if adapter was detached or attached
150  *
151  * This function gets called by the common i/o layer if an adapter has gone
152  * or reappeared.
153  */
154 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
155 {
156         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
157
158         switch (event) {
159         case CIO_GONE:
160                 dev_warn(&adapter->ccw_device->dev,
161                          "The FCP device has been detached\n");
162                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
163                 break;
164         case CIO_NO_PATH:
165                 dev_warn(&adapter->ccw_device->dev,
166                          "The CHPID for the FCP device is offline\n");
167                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
168                 break;
169         case CIO_OPER:
170                 dev_info(&adapter->ccw_device->dev,
171                          "The FCP device is operational again\n");
172                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
173                                                ZFCP_STATUS_COMMON_RUNNING,
174                                                ZFCP_SET);
175                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
176                                         "ccnoti4", NULL);
177                 break;
178         case CIO_BOXED:
179                 dev_warn(&adapter->ccw_device->dev,
180                          "The ccw device did not respond in time.\n");
181                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
182                 break;
183         }
184         return 1;
185 }
186
187 /**
188  * zfcp_ccw_shutdown - handle shutdown from cio
189  * @cdev: device for adapter to shutdown.
190  */
191 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
192 {
193         struct zfcp_adapter *adapter;
194
195         down(&zfcp_data.config_sema);
196         adapter = dev_get_drvdata(&cdev->dev);
197         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
198         zfcp_erp_wait(adapter);
199         up(&zfcp_data.config_sema);
200 }
201
202 static struct ccw_device_id zfcp_ccw_device_id[] = {
203         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
204         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
205         {},
206 };
207
208 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
209
210 static struct ccw_driver zfcp_ccw_driver = {
211         .owner       = THIS_MODULE,
212         .name        = "zfcp",
213         .ids         = zfcp_ccw_device_id,
214         .probe       = zfcp_ccw_probe,
215         .remove      = zfcp_ccw_remove,
216         .set_online  = zfcp_ccw_set_online,
217         .set_offline = zfcp_ccw_set_offline,
218         .notify      = zfcp_ccw_notify,
219         .shutdown    = zfcp_ccw_shutdown,
220 };
221
222 /**
223  * zfcp_ccw_register - ccw register function
224  *
225  * Registers the driver at the common i/o layer. This function will be called
226  * at module load time/system start.
227  */
228 int __init zfcp_ccw_register(void)
229 {
230         return ccw_driver_register(&zfcp_ccw_driver);
231 }
232
233 /**
234  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
235  * @busid: bus id string of zfcp adapter to find
236  */
237 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
238 {
239         struct ccw_device *ccw_device;
240         struct zfcp_adapter *adapter = NULL;
241
242         ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
243         if (ccw_device) {
244                 adapter = dev_get_drvdata(&ccw_device->dev);
245                 put_device(&ccw_device->dev);
246         }
247         return adapter;
248 }