s390: use free_netdev(netdev) instead of kfree()
[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, 2010
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->dev, &zfcp_sysfs_unit_attrs);
127
128         list_for_each_entry_safe(port, p, &port_remove_lh, list)
129                 zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs);
130
131         zfcp_adapter_unregister(adapter);
132 }
133
134 /**
135  * zfcp_ccw_set_online - set_online function of zfcp driver
136  * @cdev: pointer to belonging ccw device
137  *
138  * This function gets called by the common i/o layer and sets an
139  * adapter into state online.  The first call will allocate all
140  * adapter resources that will be retained until the device is removed
141  * via zfcp_ccw_remove.
142  *
143  * Setting an fcp device online means that it will be registered with
144  * the SCSI stack, that the QDIO queues will be set up and that the
145  * adapter will be opened.
146  */
147 static int zfcp_ccw_set_online(struct ccw_device *cdev)
148 {
149         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
150
151         if (!adapter) {
152                 adapter = zfcp_adapter_enqueue(cdev);
153
154                 if (IS_ERR(adapter)) {
155                         dev_err(&cdev->dev,
156                                 "Setting up data structures for the "
157                                 "FCP adapter failed\n");
158                         return PTR_ERR(adapter);
159                 }
160                 kref_get(&adapter->ref);
161         }
162
163         /* initialize request counter */
164         BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
165         adapter->req_no = 0;
166
167         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
168                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
169         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
170                                 "ccsonl2", NULL);
171         zfcp_erp_wait(adapter);
172
173         flush_work(&adapter->scan_work);
174
175         zfcp_ccw_adapter_put(adapter);
176         return 0;
177 }
178
179 /**
180  * zfcp_ccw_set_offline - set_offline function of zfcp driver
181  * @cdev: pointer to belonging ccw device
182  *
183  * This function gets called by the common i/o layer and sets an adapter
184  * into state offline.
185  */
186 static int zfcp_ccw_set_offline(struct ccw_device *cdev)
187 {
188         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
189
190         if (!adapter)
191                 return 0;
192
193         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
194         zfcp_erp_wait(adapter);
195
196         zfcp_ccw_adapter_put(adapter);
197         return 0;
198 }
199
200 /**
201  * zfcp_ccw_notify - ccw notify function
202  * @cdev: pointer to belonging ccw device
203  * @event: indicates if adapter was detached or attached
204  *
205  * This function gets called by the common i/o layer if an adapter has gone
206  * or reappeared.
207  */
208 static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
209 {
210         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
211
212         if (!adapter)
213                 return 1;
214
215         switch (event) {
216         case CIO_GONE:
217                 dev_warn(&cdev->dev, "The FCP device has been detached\n");
218                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
219                 break;
220         case CIO_NO_PATH:
221                 dev_warn(&cdev->dev,
222                          "The CHPID for the FCP device is offline\n");
223                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
224                 break;
225         case CIO_OPER:
226                 dev_info(&cdev->dev, "The FCP device is operational again\n");
227                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
228                                                ZFCP_STATUS_COMMON_RUNNING,
229                                                ZFCP_SET);
230                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
231                                         "ccnoti4", NULL);
232                 break;
233         case CIO_BOXED:
234                 dev_warn(&cdev->dev, "The FCP device did not respond within "
235                                      "the specified time\n");
236                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
237                 break;
238         }
239
240         zfcp_ccw_adapter_put(adapter);
241         return 1;
242 }
243
244 /**
245  * zfcp_ccw_shutdown - handle shutdown from cio
246  * @cdev: device for adapter to shutdown.
247  */
248 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
249 {
250         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
251
252         if (!adapter)
253                 return;
254
255         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
256         zfcp_erp_wait(adapter);
257         zfcp_erp_thread_kill(adapter);
258
259         zfcp_ccw_adapter_put(adapter);
260 }
261
262 struct ccw_driver zfcp_ccw_driver = {
263         .owner       = THIS_MODULE,
264         .name        = "zfcp",
265         .ids         = zfcp_ccw_device_id,
266         .probe       = zfcp_ccw_probe,
267         .remove      = zfcp_ccw_remove,
268         .set_online  = zfcp_ccw_set_online,
269         .set_offline = zfcp_ccw_set_offline,
270         .notify      = zfcp_ccw_notify,
271         .shutdown    = zfcp_ccw_shutdown,
272         .freeze      = zfcp_ccw_set_offline,
273         .thaw        = zfcp_ccw_activate,
274         .restore     = zfcp_ccw_activate,
275 };