[SCSI] zfcp: No ERP escalation on gpn_ft eval
[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_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING);
50         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
51                                 "ccresu2", NULL);
52         zfcp_erp_wait(adapter);
53         flush_work(&adapter->scan_work);
54
55         zfcp_ccw_adapter_put(adapter);
56
57         return 0;
58 }
59
60 static struct ccw_device_id zfcp_ccw_device_id[] = {
61         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
62         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
63         {},
64 };
65 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
66
67 /**
68  * zfcp_ccw_priv_sch - check if subchannel is privileged
69  * @adapter: Adapter/Subchannel to check
70  */
71 int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
72 {
73         return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
74 }
75
76 /**
77  * zfcp_ccw_probe - probe function of zfcp driver
78  * @cdev: pointer to belonging ccw device
79  *
80  * This function gets called by the common i/o layer for each FCP
81  * device found on the current system. This is only a stub to make cio
82  * work: To only allocate adapter resources for devices actually used,
83  * the allocation is deferred to the first call to ccw_set_online.
84  */
85 static int zfcp_ccw_probe(struct ccw_device *cdev)
86 {
87         return 0;
88 }
89
90 /**
91  * zfcp_ccw_remove - remove function of zfcp driver
92  * @cdev: pointer to belonging ccw device
93  *
94  * This function gets called by the common i/o layer and removes an adapter
95  * from the system. Task of this function is to get rid of all units and
96  * ports that belong to this adapter. And in addition all resources of this
97  * adapter will be freed too.
98  */
99 static void zfcp_ccw_remove(struct ccw_device *cdev)
100 {
101         struct zfcp_adapter *adapter;
102         struct zfcp_port *port, *p;
103         struct zfcp_unit *unit, *u;
104         LIST_HEAD(unit_remove_lh);
105         LIST_HEAD(port_remove_lh);
106
107         ccw_device_set_offline(cdev);
108
109         adapter = zfcp_ccw_adapter_by_cdev(cdev);
110         if (!adapter)
111                 return;
112
113         write_lock_irq(&adapter->port_list_lock);
114         list_for_each_entry_safe(port, p, &adapter->port_list, list) {
115                 write_lock(&port->unit_list_lock);
116                 list_for_each_entry_safe(unit, u, &port->unit_list, list)
117                         list_move(&unit->list, &unit_remove_lh);
118                 write_unlock(&port->unit_list_lock);
119                 list_move(&port->list, &port_remove_lh);
120         }
121         write_unlock_irq(&adapter->port_list_lock);
122         zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */
123
124         list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
125                 zfcp_device_unregister(&unit->dev, &zfcp_sysfs_unit_attrs);
126
127         list_for_each_entry_safe(port, p, &port_remove_lh, list)
128                 zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs);
129
130         zfcp_adapter_unregister(adapter);
131 }
132
133 /**
134  * zfcp_ccw_set_online - set_online function of zfcp driver
135  * @cdev: pointer to belonging ccw device
136  *
137  * This function gets called by the common i/o layer and sets an
138  * adapter into state online.  The first call will allocate all
139  * adapter resources that will be retained until the device is removed
140  * via zfcp_ccw_remove.
141  *
142  * Setting an fcp device online means that it will be registered with
143  * the SCSI stack, that the QDIO queues will be set up and that the
144  * adapter will be opened.
145  */
146 static int zfcp_ccw_set_online(struct ccw_device *cdev)
147 {
148         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
149
150         if (!adapter) {
151                 adapter = zfcp_adapter_enqueue(cdev);
152
153                 if (IS_ERR(adapter)) {
154                         dev_err(&cdev->dev,
155                                 "Setting up data structures for the "
156                                 "FCP adapter failed\n");
157                         return PTR_ERR(adapter);
158                 }
159                 kref_get(&adapter->ref);
160         }
161
162         /* initialize request counter */
163         BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
164         adapter->req_no = 0;
165
166         zfcp_ccw_activate(cdev);
167         zfcp_ccw_adapter_put(adapter);
168         return 0;
169 }
170
171 /**
172  * zfcp_ccw_set_offline - set_offline function of zfcp driver
173  * @cdev: pointer to belonging ccw device
174  *
175  * This function gets called by the common i/o layer and sets an adapter
176  * into state offline.
177  */
178 static int zfcp_ccw_set_offline(struct ccw_device *cdev)
179 {
180         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
181
182         if (!adapter)
183                 return 0;
184
185         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
186         zfcp_erp_wait(adapter);
187
188         zfcp_ccw_adapter_put(adapter);
189         return 0;
190 }
191
192 /**
193  * zfcp_ccw_notify - ccw notify function
194  * @cdev: pointer to belonging ccw device
195  * @event: indicates if adapter was detached or attached
196  *
197  * This function gets called by the common i/o layer if an adapter has gone
198  * or reappeared.
199  */
200 static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
201 {
202         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
203
204         if (!adapter)
205                 return 1;
206
207         switch (event) {
208         case CIO_GONE:
209                 dev_warn(&cdev->dev, "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(&cdev->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(&cdev->dev, "The FCP device is operational again\n");
219                 zfcp_erp_set_adapter_status(adapter,
220                                             ZFCP_STATUS_COMMON_RUNNING);
221                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
222                                         "ccnoti4", NULL);
223                 break;
224         case CIO_BOXED:
225                 dev_warn(&cdev->dev, "The FCP device did not respond within "
226                                      "the specified time\n");
227                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
228                 break;
229         }
230
231         zfcp_ccw_adapter_put(adapter);
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 = zfcp_ccw_adapter_by_cdev(cdev);
242
243         if (!adapter)
244                 return;
245
246         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
247         zfcp_erp_wait(adapter);
248         zfcp_erp_thread_kill(adapter);
249
250         zfcp_ccw_adapter_put(adapter);
251 }
252
253 struct ccw_driver zfcp_ccw_driver = {
254         .owner       = THIS_MODULE,
255         .name        = "zfcp",
256         .ids         = zfcp_ccw_device_id,
257         .probe       = zfcp_ccw_probe,
258         .remove      = zfcp_ccw_remove,
259         .set_online  = zfcp_ccw_set_online,
260         .set_offline = zfcp_ccw_set_offline,
261         .notify      = zfcp_ccw_notify,
262         .shutdown    = zfcp_ccw_shutdown,
263         .freeze      = zfcp_ccw_set_offline,
264         .thaw        = zfcp_ccw_activate,
265         .restore     = zfcp_ccw_activate,
266 };