Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[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, 2008
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 (atomic_read(&unit->status) &
76                             ZFCP_STATUS_UNIT_REGISTERED)
77                                 scsi_remove_device(unit->device);
78                         zfcp_unit_dequeue(unit);
79                 }
80                 zfcp_port_dequeue(port);
81         }
82         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
83         zfcp_adapter_dequeue(adapter);
84
85         up(&zfcp_data.config_sema);
86 }
87
88 /**
89  * zfcp_ccw_set_online - set_online 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 sets an adapter
93  * into state online. Setting an fcp device online means that it will be
94  * registered with the SCSI stack, that the QDIO queues will be set up
95  * and that the adapter will be opened (asynchronously).
96  */
97 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
98 {
99         struct zfcp_adapter *adapter;
100         int retval;
101
102         down(&zfcp_data.config_sema);
103         adapter = dev_get_drvdata(&ccw_device->dev);
104
105         retval = zfcp_erp_thread_setup(adapter);
106         if (retval)
107                 goto out;
108
109         /* initialize request counter */
110         BUG_ON(!zfcp_reqlist_isempty(adapter));
111         adapter->req_no = 0;
112
113         zfcp_erp_modify_adapter_status(adapter, 10, NULL,
114                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
115         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
116                                 NULL);
117         zfcp_erp_wait(adapter);
118         up(&zfcp_data.config_sema);
119         flush_work(&adapter->scan_work);
120         return 0;
121
122  out:
123         up(&zfcp_data.config_sema);
124         return retval;
125 }
126
127 /**
128  * zfcp_ccw_set_offline - set_offline function of zfcp driver
129  * @ccw_device: pointer to belonging ccw device
130  *
131  * This function gets called by the common i/o layer and sets an adapter
132  * into state offline.
133  */
134 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
135 {
136         struct zfcp_adapter *adapter;
137
138         down(&zfcp_data.config_sema);
139         adapter = dev_get_drvdata(&ccw_device->dev);
140         zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
141         zfcp_erp_wait(adapter);
142         zfcp_erp_thread_kill(adapter);
143         up(&zfcp_data.config_sema);
144         return 0;
145 }
146
147 /**
148  * zfcp_ccw_notify - ccw notify function
149  * @ccw_device: pointer to belonging ccw device
150  * @event: indicates if adapter was detached or attached
151  *
152  * This function gets called by the common i/o layer if an adapter has gone
153  * or reappeared.
154  */
155 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
156 {
157         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
158
159         switch (event) {
160         case CIO_GONE:
161                 dev_warn(&adapter->ccw_device->dev,
162                          "The FCP device has been detached\n");
163                 zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
164                 break;
165         case CIO_NO_PATH:
166                 dev_warn(&adapter->ccw_device->dev,
167                          "The CHPID for the FCP device is offline\n");
168                 zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
169                 break;
170         case CIO_OPER:
171                 dev_info(&adapter->ccw_device->dev,
172                          "The FCP device is operational again\n");
173                 zfcp_erp_modify_adapter_status(adapter, 11, NULL,
174                                                ZFCP_STATUS_COMMON_RUNNING,
175                                                ZFCP_SET);
176                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
177                                         89, NULL);
178                 break;
179         }
180         return 1;
181 }
182
183 /**
184  * zfcp_ccw_shutdown - handle shutdown from cio
185  * @cdev: device for adapter to shutdown.
186  */
187 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
188 {
189         struct zfcp_adapter *adapter;
190
191         down(&zfcp_data.config_sema);
192         adapter = dev_get_drvdata(&cdev->dev);
193         zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
194         zfcp_erp_wait(adapter);
195         up(&zfcp_data.config_sema);
196 }
197
198 static struct ccw_device_id zfcp_ccw_device_id[] = {
199         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
200         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
201         {},
202 };
203
204 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
205
206 static struct ccw_driver zfcp_ccw_driver = {
207         .owner       = THIS_MODULE,
208         .name        = "zfcp",
209         .ids         = zfcp_ccw_device_id,
210         .probe       = zfcp_ccw_probe,
211         .remove      = zfcp_ccw_remove,
212         .set_online  = zfcp_ccw_set_online,
213         .set_offline = zfcp_ccw_set_offline,
214         .notify      = zfcp_ccw_notify,
215         .shutdown    = zfcp_ccw_shutdown,
216 };
217
218 /**
219  * zfcp_ccw_register - ccw register function
220  *
221  * Registers the driver at the common i/o layer. This function will be called
222  * at module load time/system start.
223  */
224 int __init zfcp_ccw_register(void)
225 {
226         return ccw_driver_register(&zfcp_ccw_driver);
227 }
228
229 /**
230  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
231  * @busid: bus id string of zfcp adapter to find
232  */
233 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
234 {
235         struct ccw_device *ccw_device;
236         struct zfcp_adapter *adapter = NULL;
237
238         ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
239         if (ccw_device) {
240                 adapter = dev_get_drvdata(&ccw_device->dev);
241                 put_device(&ccw_device->dev);
242         }
243         return adapter;
244 }