Merge branch 'x86/unify-cpu-detect' into x86-v28-for-linus-phase4-D
[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 #include "zfcp_ext.h"
10
11 /**
12  * zfcp_ccw_probe - probe function of zfcp driver
13  * @ccw_device: pointer to belonging ccw device
14  *
15  * This function gets called by the common i/o layer and sets up the initial
16  * data structures for each fcp adapter, which was detected by the system.
17  * Also the sysfs files for this adapter will be created by this function.
18  * In addition the nameserver port will be added to the ports of the adapter
19  * and its sysfs representation will be created too.
20  */
21 static int zfcp_ccw_probe(struct ccw_device *ccw_device)
22 {
23         int retval = 0;
24
25         down(&zfcp_data.config_sema);
26         if (zfcp_adapter_enqueue(ccw_device)) {
27                 dev_err(&ccw_device->dev,
28                         "Setup of data structures failed.\n");
29                 retval = -EINVAL;
30         }
31         up(&zfcp_data.config_sema);
32         return retval;
33 }
34
35 /**
36  * zfcp_ccw_remove - remove function of zfcp driver
37  * @ccw_device: pointer to belonging ccw device
38  *
39  * This function gets called by the common i/o layer and removes an adapter
40  * from the system. Task of this function is to get rid of all units and
41  * ports that belong to this adapter. And in addition all resources of this
42  * adapter will be freed too.
43  */
44 static void zfcp_ccw_remove(struct ccw_device *ccw_device)
45 {
46         struct zfcp_adapter *adapter;
47         struct zfcp_port *port, *p;
48         struct zfcp_unit *unit, *u;
49
50         ccw_device_set_offline(ccw_device);
51         down(&zfcp_data.config_sema);
52         adapter = dev_get_drvdata(&ccw_device->dev);
53
54         write_lock_irq(&zfcp_data.config_lock);
55         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
56                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
57                         list_move(&unit->list, &port->unit_remove_lh);
58                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
59                                         &unit->status);
60                 }
61                 list_move(&port->list, &adapter->port_remove_lh);
62                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
63         }
64         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
65         write_unlock_irq(&zfcp_data.config_lock);
66
67         list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) {
68                 list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) {
69                         if (atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
70                                 &unit->status))
71                                 scsi_remove_device(unit->device);
72                         zfcp_unit_dequeue(unit);
73                 }
74                 zfcp_port_dequeue(port);
75         }
76         zfcp_adapter_wait(adapter);
77         zfcp_adapter_dequeue(adapter);
78
79         up(&zfcp_data.config_sema);
80 }
81
82 /**
83  * zfcp_ccw_set_online - set_online function of zfcp driver
84  * @ccw_device: pointer to belonging ccw device
85  *
86  * This function gets called by the common i/o layer and sets an adapter
87  * into state online. Setting an fcp device online means that it will be
88  * registered with the SCSI stack, that the QDIO queues will be set up
89  * and that the adapter will be opened (asynchronously).
90  */
91 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
92 {
93         struct zfcp_adapter *adapter;
94         int retval;
95
96         down(&zfcp_data.config_sema);
97         adapter = dev_get_drvdata(&ccw_device->dev);
98
99         retval = zfcp_erp_thread_setup(adapter);
100         if (retval)
101                 goto out;
102
103         retval = zfcp_adapter_scsi_register(adapter);
104         if (retval)
105                 goto out_scsi_register;
106
107         /* initialize request counter */
108         BUG_ON(!zfcp_reqlist_isempty(adapter));
109         adapter->req_no = 0;
110
111         zfcp_erp_modify_adapter_status(adapter, 10, NULL,
112                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
113         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
114                                 NULL);
115         zfcp_erp_wait(adapter);
116         goto out;
117
118  out_scsi_register:
119         zfcp_erp_thread_kill(adapter);
120  out:
121         up(&zfcp_data.config_sema);
122         return retval;
123 }
124
125 /**
126  * zfcp_ccw_set_offline - set_offline function of zfcp driver
127  * @ccw_device: pointer to belonging ccw device
128  *
129  * This function gets called by the common i/o layer and sets an adapter
130  * into state offline.
131  */
132 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
133 {
134         struct zfcp_adapter *adapter;
135
136         down(&zfcp_data.config_sema);
137         adapter = dev_get_drvdata(&ccw_device->dev);
138         zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
139         zfcp_erp_wait(adapter);
140         zfcp_erp_thread_kill(adapter);
141         up(&zfcp_data.config_sema);
142         return 0;
143 }
144
145 /**
146  * zfcp_ccw_notify - ccw notify function
147  * @ccw_device: pointer to belonging ccw device
148  * @event: indicates if adapter was detached or attached
149  *
150  * This function gets called by the common i/o layer if an adapter has gone
151  * or reappeared.
152  */
153 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
154 {
155         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
156
157         switch (event) {
158         case CIO_GONE:
159                 dev_warn(&adapter->ccw_device->dev, "device gone\n");
160                 zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
161                 break;
162         case CIO_NO_PATH:
163                 dev_warn(&adapter->ccw_device->dev, "no path\n");
164                 zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
165                 break;
166         case CIO_OPER:
167                 dev_info(&adapter->ccw_device->dev, "operational again\n");
168                 zfcp_erp_modify_adapter_status(adapter, 11, NULL,
169                                                ZFCP_STATUS_COMMON_RUNNING,
170                                                ZFCP_SET);
171                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
172                                         89, NULL);
173                 break;
174         }
175         return 1;
176 }
177
178 /**
179  * zfcp_ccw_shutdown - handle shutdown from cio
180  * @cdev: device for adapter to shutdown.
181  */
182 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
183 {
184         struct zfcp_adapter *adapter;
185
186         down(&zfcp_data.config_sema);
187         adapter = dev_get_drvdata(&cdev->dev);
188         zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
189         zfcp_erp_wait(adapter);
190         up(&zfcp_data.config_sema);
191 }
192
193 static struct ccw_device_id zfcp_ccw_device_id[] = {
194         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
195         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
196         {},
197 };
198
199 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
200
201 static struct ccw_driver zfcp_ccw_driver = {
202         .owner       = THIS_MODULE,
203         .name        = "zfcp",
204         .ids         = zfcp_ccw_device_id,
205         .probe       = zfcp_ccw_probe,
206         .remove      = zfcp_ccw_remove,
207         .set_online  = zfcp_ccw_set_online,
208         .set_offline = zfcp_ccw_set_offline,
209         .notify      = zfcp_ccw_notify,
210         .shutdown    = zfcp_ccw_shutdown,
211 };
212
213 /**
214  * zfcp_ccw_register - ccw register function
215  *
216  * Registers the driver at the common i/o layer. This function will be called
217  * at module load time/system start.
218  */
219 int __init zfcp_ccw_register(void)
220 {
221         return ccw_driver_register(&zfcp_ccw_driver);
222 }