Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-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, 2009
7  */
8
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include "zfcp_ext.h"
13
14 #define ZFCP_MODEL_PRIV 0x4
15
16 static int zfcp_ccw_suspend(struct ccw_device *cdev)
17
18 {
19         struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);
20
21         down(&zfcp_data.config_sema);
22
23         zfcp_erp_adapter_shutdown(adapter, 0, "ccsusp1", NULL);
24         zfcp_erp_wait(adapter);
25
26         up(&zfcp_data.config_sema);
27
28         return 0;
29 }
30
31 static int zfcp_ccw_activate(struct ccw_device *cdev)
32
33 {
34         struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);
35
36         zfcp_erp_modify_adapter_status(adapter, "ccresu1", NULL,
37                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
38         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
39                                 "ccresu2", NULL);
40         zfcp_erp_wait(adapter);
41         flush_work(&adapter->scan_work);
42
43         return 0;
44 }
45
46 static struct ccw_device_id zfcp_ccw_device_id[] = {
47         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
48         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
49         {},
50 };
51 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
52
53 /**
54  * zfcp_ccw_priv_sch - check if subchannel is privileged
55  * @adapter: Adapter/Subchannel to check
56  */
57 int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
58 {
59         return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
60 }
61
62 /**
63  * zfcp_ccw_probe - probe function of zfcp driver
64  * @ccw_device: pointer to belonging ccw device
65  *
66  * This function gets called by the common i/o layer and sets up the initial
67  * data structures for each fcp adapter, which was detected by the system.
68  * Also the sysfs files for this adapter will be created by this function.
69  * In addition the nameserver port will be added to the ports of the adapter
70  * and its sysfs representation will be created too.
71  */
72 static int zfcp_ccw_probe(struct ccw_device *ccw_device)
73 {
74         int retval = 0;
75
76         down(&zfcp_data.config_sema);
77         if (zfcp_adapter_enqueue(ccw_device)) {
78                 dev_err(&ccw_device->dev,
79                         "Setting up data structures for the "
80                         "FCP adapter failed\n");
81                 retval = -EINVAL;
82         }
83         up(&zfcp_data.config_sema);
84         return retval;
85 }
86
87 /**
88  * zfcp_ccw_remove - remove 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 removes an adapter
92  * from the system. Task of this function is to get rid of all units and
93  * ports that belong to this adapter. And in addition all resources of this
94  * adapter will be freed too.
95  */
96 static void 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         LIST_HEAD(unit_remove_lh);
102         LIST_HEAD(port_remove_lh);
103
104         ccw_device_set_offline(ccw_device);
105         down(&zfcp_data.config_sema);
106         adapter = dev_get_drvdata(&ccw_device->dev);
107
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, &unit_remove_lh);
112                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
113                                         &unit->status);
114                 }
115                 list_move(&port->list, &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, &port_remove_lh, list) {
122                 list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
123                         if (unit->device)
124                                 scsi_remove_device(unit->device);
125                         zfcp_unit_dequeue(unit);
126                 }
127                 zfcp_port_dequeue(port);
128         }
129         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
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 zfcp_ccw_set_online(struct ccw_device *ccw_device)
145 {
146         struct zfcp_adapter *adapter;
147         int retval;
148
149         down(&zfcp_data.config_sema);
150         adapter = dev_get_drvdata(&ccw_device->dev);
151
152         retval = zfcp_erp_thread_setup(adapter);
153         if (retval)
154                 goto out;
155
156         /* initialize request counter */
157         BUG_ON(!zfcp_reqlist_isempty(adapter));
158         adapter->req_no = 0;
159
160         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
161                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
162         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
163                                 "ccsonl2", NULL);
164         zfcp_erp_wait(adapter);
165         up(&zfcp_data.config_sema);
166         flush_work(&adapter->scan_work);
167         return 0;
168
169  out:
170         up(&zfcp_data.config_sema);
171         return retval;
172 }
173
174 /**
175  * zfcp_ccw_set_offline - set_offline function of zfcp driver
176  * @ccw_device: pointer to belonging ccw device
177  *
178  * This function gets called by the common i/o layer and sets an adapter
179  * into state offline.
180  */
181 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
182 {
183         struct zfcp_adapter *adapter;
184
185         down(&zfcp_data.config_sema);
186         adapter = dev_get_drvdata(&ccw_device->dev);
187         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
188         zfcp_erp_wait(adapter);
189         zfcp_erp_thread_kill(adapter);
190         up(&zfcp_data.config_sema);
191         return 0;
192 }
193
194 /**
195  * zfcp_ccw_notify - ccw notify function
196  * @ccw_device: pointer to belonging ccw device
197  * @event: indicates if adapter was detached or attached
198  *
199  * This function gets called by the common i/o layer if an adapter has gone
200  * or reappeared.
201  */
202 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
203 {
204         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
205
206         switch (event) {
207         case CIO_GONE:
208                 dev_warn(&adapter->ccw_device->dev,
209                          "The FCP device has been detached\n");
210                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
211                 break;
212         case CIO_NO_PATH:
213                 dev_warn(&adapter->ccw_device->dev,
214                          "The CHPID for the FCP device is offline\n");
215                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
216                 break;
217         case CIO_OPER:
218                 dev_info(&adapter->ccw_device->dev,
219                          "The FCP device is operational again\n");
220                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
221                                                ZFCP_STATUS_COMMON_RUNNING,
222                                                ZFCP_SET);
223                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
224                                         "ccnoti4", NULL);
225                 break;
226         case CIO_BOXED:
227                 dev_warn(&adapter->ccw_device->dev, "The FCP device "
228                          "did not respond within the specified time\n");
229                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
230                 break;
231         }
232         return 1;
233 }
234
235 /**
236  * zfcp_ccw_shutdown - handle shutdown from cio
237  * @cdev: device for adapter to shutdown.
238  */
239 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
240 {
241         struct zfcp_adapter *adapter;
242
243         down(&zfcp_data.config_sema);
244         adapter = dev_get_drvdata(&cdev->dev);
245         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
246         zfcp_erp_wait(adapter);
247         up(&zfcp_data.config_sema);
248 }
249
250 static struct ccw_driver zfcp_ccw_driver = {
251         .owner       = THIS_MODULE,
252         .name        = "zfcp",
253         .ids         = zfcp_ccw_device_id,
254         .probe       = zfcp_ccw_probe,
255         .remove      = zfcp_ccw_remove,
256         .set_online  = zfcp_ccw_set_online,
257         .set_offline = zfcp_ccw_set_offline,
258         .notify      = zfcp_ccw_notify,
259         .shutdown    = zfcp_ccw_shutdown,
260         .freeze      = zfcp_ccw_suspend,
261         .thaw        = zfcp_ccw_activate,
262         .restore     = zfcp_ccw_activate,
263 };
264
265 /**
266  * zfcp_ccw_register - ccw register function
267  *
268  * Registers the driver at the common i/o layer. This function will be called
269  * at module load time/system start.
270  */
271 int __init zfcp_ccw_register(void)
272 {
273         return ccw_driver_register(&zfcp_ccw_driver);
274 }
275
276 /**
277  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
278  * @busid: bus id string of zfcp adapter to find
279  */
280 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
281 {
282         struct ccw_device *ccw_device;
283         struct zfcp_adapter *adapter = NULL;
284
285         ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
286         if (ccw_device) {
287                 adapter = dev_get_drvdata(&ccw_device->dev);
288                 put_device(&ccw_device->dev);
289         }
290         return adapter;
291 }