[SCSI] zfcp: Move FSF request tracking code to new file
[linux-2.6.git] / 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 #include "zfcp_reqlist.h"
14
15 #define ZFCP_MODEL_PRIV 0x4
16
17 static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
18
19 struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
20 {
21         struct zfcp_adapter *adapter;
22         unsigned long flags;
23
24         spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
25         adapter = dev_get_drvdata(&cdev->dev);
26         if (adapter)
27                 kref_get(&adapter->ref);
28         spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
29         return adapter;
30 }
31
32 void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
33 {
34         unsigned long flags;
35
36         spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
37         kref_put(&adapter->ref, zfcp_adapter_release);
38         spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
39 }
40
41 static int zfcp_ccw_activate(struct ccw_device *cdev)
42
43 {
44         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
45
46         if (!adapter)
47                 return 0;
48
49         zfcp_erp_modify_adapter_status(adapter, "ccresu1", NULL,
50                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
51         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
52                                 "ccresu2", NULL);
53         zfcp_erp_wait(adapter);
54         flush_work(&adapter->scan_work);
55
56         zfcp_ccw_adapter_put(adapter);
57
58         return 0;
59 }
60
61 static struct ccw_device_id zfcp_ccw_device_id[] = {
62         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
63         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
64         {},
65 };
66 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
67
68 /**
69  * zfcp_ccw_priv_sch - check if subchannel is privileged
70  * @adapter: Adapter/Subchannel to check
71  */
72 int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
73 {
74         return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
75 }
76
77 /**
78  * zfcp_ccw_probe - probe function of zfcp driver
79  * @cdev: pointer to belonging ccw device
80  *
81  * This function gets called by the common i/o layer for each FCP
82  * device found on the current system. This is only a stub to make cio
83  * work: To only allocate adapter resources for devices actually used,
84  * the allocation is deferred to the first call to ccw_set_online.
85  */
86 static int zfcp_ccw_probe(struct ccw_device *cdev)
87 {
88         return 0;
89 }
90
91 /**
92  * zfcp_ccw_remove - remove function of zfcp driver
93  * @cdev: pointer to belonging ccw device
94  *
95  * This function gets called by the common i/o layer and removes an adapter
96  * from the system. Task of this function is to get rid of all units and
97  * ports that belong to this adapter. And in addition all resources of this
98  * adapter will be freed too.
99  */
100 static void zfcp_ccw_remove(struct ccw_device *cdev)
101 {
102         struct zfcp_adapter *adapter;
103         struct zfcp_port *port, *p;
104         struct zfcp_unit *unit, *u;
105         LIST_HEAD(unit_remove_lh);
106         LIST_HEAD(port_remove_lh);
107
108         ccw_device_set_offline(cdev);
109
110         adapter = zfcp_ccw_adapter_by_cdev(cdev);
111         if (!adapter)
112                 return;
113
114         write_lock_irq(&adapter->port_list_lock);
115         list_for_each_entry_safe(port, p, &adapter->port_list, list) {
116                 write_lock(&port->unit_list_lock);
117                 list_for_each_entry_safe(unit, u, &port->unit_list, list)
118                         list_move(&unit->list, &unit_remove_lh);
119                 write_unlock(&port->unit_list_lock);
120                 list_move(&port->list, &port_remove_lh);
121         }
122         write_unlock_irq(&adapter->port_list_lock);
123         zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */
124
125         list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
126                 zfcp_device_unregister(&unit->sysfs_device,
127                                        &zfcp_sysfs_unit_attrs);
128
129         list_for_each_entry_safe(port, p, &port_remove_lh, list)
130                 zfcp_device_unregister(&port->sysfs_device,
131                                        &zfcp_sysfs_port_attrs);
132
133         zfcp_adapter_unregister(adapter);
134 }
135
136 /**
137  * zfcp_ccw_set_online - set_online function of zfcp driver
138  * @cdev: pointer to belonging ccw device
139  *
140  * This function gets called by the common i/o layer and sets an
141  * adapter into state online.  The first call will allocate all
142  * adapter resources that will be retained until the device is removed
143  * via zfcp_ccw_remove.
144  *
145  * Setting an fcp device online means that it will be registered with
146  * the SCSI stack, that the QDIO queues will be set up and that the
147  * adapter will be opened.
148  */
149 static int zfcp_ccw_set_online(struct ccw_device *cdev)
150 {
151         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
152
153         if (!adapter) {
154                 adapter = zfcp_adapter_enqueue(cdev);
155
156                 if (IS_ERR(adapter)) {
157                         dev_err(&cdev->dev,
158                                 "Setting up data structures for the "
159                                 "FCP adapter failed\n");
160                         return PTR_ERR(adapter);
161                 }
162                 kref_get(&adapter->ref);
163         }
164
165         /* initialize request counter */
166         BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
167         adapter->req_no = 0;
168
169         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
170                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
171         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
172                                 "ccsonl2", NULL);
173         zfcp_erp_wait(adapter);
174
175         flush_work(&adapter->scan_work);
176
177         zfcp_ccw_adapter_put(adapter);
178         return 0;
179 }
180
181 /**
182  * zfcp_ccw_set_offline - set_offline function of zfcp driver
183  * @cdev: pointer to belonging ccw device
184  *
185  * This function gets called by the common i/o layer and sets an adapter
186  * into state offline.
187  */
188 static int zfcp_ccw_set_offline(struct ccw_device *cdev)
189 {
190         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
191
192         if (!adapter)
193                 return 0;
194
195         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
196         zfcp_erp_wait(adapter);
197
198         zfcp_ccw_adapter_put(adapter);
199         return 0;
200 }
201
202 /**
203  * zfcp_ccw_notify - ccw notify function
204  * @cdev: pointer to belonging ccw device
205  * @event: indicates if adapter was detached or attached
206  *
207  * This function gets called by the common i/o layer if an adapter has gone
208  * or reappeared.
209  */
210 static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
211 {
212         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
213
214         if (!adapter)
215                 return 1;
216
217         switch (event) {
218         case CIO_GONE:
219                 dev_warn(&cdev->dev, "The FCP device has been detached\n");
220                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
221                 break;
222         case CIO_NO_PATH:
223                 dev_warn(&cdev->dev,
224                          "The CHPID for the FCP device is offline\n");
225                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
226                 break;
227         case CIO_OPER:
228                 dev_info(&cdev->dev, "The FCP device is operational again\n");
229                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
230                                                ZFCP_STATUS_COMMON_RUNNING,
231                                                ZFCP_SET);
232                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
233                                         "ccnoti4", NULL);
234                 break;
235         case CIO_BOXED:
236                 dev_warn(&cdev->dev, "The FCP device did not respond within "
237                                      "the specified time\n");
238                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
239                 break;
240         }
241
242         zfcp_ccw_adapter_put(adapter);
243         return 1;
244 }
245
246 /**
247  * zfcp_ccw_shutdown - handle shutdown from cio
248  * @cdev: device for adapter to shutdown.
249  */
250 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
251 {
252         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
253
254         if (!adapter)
255                 return;
256
257         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
258         zfcp_erp_wait(adapter);
259         zfcp_erp_thread_kill(adapter);
260
261         zfcp_ccw_adapter_put(adapter);
262 }
263
264 struct ccw_driver zfcp_ccw_driver = {
265         .owner       = THIS_MODULE,
266         .name        = "zfcp",
267         .ids         = zfcp_ccw_device_id,
268         .probe       = zfcp_ccw_probe,
269         .remove      = zfcp_ccw_remove,
270         .set_online  = zfcp_ccw_set_online,
271         .set_offline = zfcp_ccw_set_offline,
272         .notify      = zfcp_ccw_notify,
273         .shutdown    = zfcp_ccw_shutdown,
274         .freeze      = zfcp_ccw_set_offline,
275         .thaw        = zfcp_ccw_activate,
276         .restore     = zfcp_ccw_activate,
277 };