Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
fa04c281 | 2 | * zfcp device driver |
1da177e4 | 3 | * |
fa04c281 | 4 | * Registration and callback for the s390 common I/O layer. |
1da177e4 | 5 | * |
a53c8fab | 6 | * Copyright IBM Corp. 2002, 2010 |
1da177e4 LT |
7 | */ |
8 | ||
ecf39d42 CS |
9 | #define KMSG_COMPONENT "zfcp" |
10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
11 | ||
3a4c5d59 | 12 | #include <linux/module.h> |
1da177e4 | 13 | #include "zfcp_ext.h" |
b6bd2fb9 | 14 | #include "zfcp_reqlist.h" |
1da177e4 | 15 | |
6fcf41d1 CS |
16 | #define ZFCP_MODEL_PRIV 0x4 |
17 | ||
de3dc572 SS |
18 | static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock); |
19 | ||
20 | struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev) | |
21 | { | |
22 | struct zfcp_adapter *adapter; | |
23 | unsigned long flags; | |
24 | ||
25 | spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags); | |
26 | adapter = dev_get_drvdata(&cdev->dev); | |
27 | if (adapter) | |
28 | kref_get(&adapter->ref); | |
29 | spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags); | |
30 | return adapter; | |
31 | } | |
32 | ||
33 | void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter) | |
34 | { | |
35 | unsigned long flags; | |
36 | ||
37 | spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags); | |
38 | kref_put(&adapter->ref, zfcp_adapter_release); | |
39 | spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags); | |
40 | } | |
41 | ||
daa70fa9 MP |
42 | static int zfcp_ccw_activate(struct ccw_device *cdev) |
43 | ||
44 | { | |
de3dc572 | 45 | struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); |
daa70fa9 | 46 | |
143bb6bf CS |
47 | if (!adapter) |
48 | return 0; | |
49 | ||
edaed859 | 50 | zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING); |
daa70fa9 | 51 | zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, |
ea4a3a6a | 52 | "ccresu2"); |
daa70fa9 MP |
53 | zfcp_erp_wait(adapter); |
54 | flush_work(&adapter->scan_work); | |
55 | ||
de3dc572 SS |
56 | zfcp_ccw_adapter_put(adapter); |
57 | ||
daa70fa9 MP |
58 | return 0; |
59 | } | |
60 | ||
6fcf41d1 CS |
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 | ||
1da177e4 LT |
77 | /** |
78 | * zfcp_ccw_probe - probe function of zfcp driver | |
de3dc572 | 79 | * @cdev: pointer to belonging ccw device |
1da177e4 | 80 | * |
143bb6bf CS |
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. | |
1da177e4 | 85 | */ |
de3dc572 | 86 | static int zfcp_ccw_probe(struct ccw_device *cdev) |
1da177e4 | 87 | { |
143bb6bf | 88 | return 0; |
1da177e4 LT |
89 | } |
90 | ||
91 | /** | |
92 | * zfcp_ccw_remove - remove function of zfcp driver | |
de3dc572 | 93 | * @cdev: pointer to belonging ccw device |
1da177e4 LT |
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 | */ | |
de3dc572 | 100 | static void zfcp_ccw_remove(struct ccw_device *cdev) |
1da177e4 LT |
101 | { |
102 | struct zfcp_adapter *adapter; | |
103 | struct zfcp_port *port, *p; | |
104 | struct zfcp_unit *unit, *u; | |
0406289e CS |
105 | LIST_HEAD(unit_remove_lh); |
106 | LIST_HEAD(port_remove_lh); | |
1da177e4 | 107 | |
de3dc572 | 108 | ccw_device_set_offline(cdev); |
f45a5421 | 109 | |
de3dc572 | 110 | adapter = zfcp_ccw_adapter_by_cdev(cdev); |
ecf0c772 SS |
111 | if (!adapter) |
112 | return; | |
113 | ||
ecf0c772 SS |
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); | |
6b183334 | 117 | list_for_each_entry_safe(unit, u, &port->unit_list, list) |
ecf0c772 | 118 | list_move(&unit->list, &unit_remove_lh); |
ecf0c772 | 119 | write_unlock(&port->unit_list_lock); |
ecf0c772 | 120 | list_move(&port->list, &port_remove_lh); |
1da177e4 | 121 | } |
ecf0c772 | 122 | write_unlock_irq(&adapter->port_list_lock); |
de3dc572 | 123 | zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */ |
1da177e4 | 124 | |
f3450c7b | 125 | list_for_each_entry_safe(unit, u, &unit_remove_lh, list) |
615f59e0 | 126 | zfcp_device_unregister(&unit->dev, &zfcp_sysfs_unit_attrs); |
f3450c7b SS |
127 | |
128 | list_for_each_entry_safe(port, p, &port_remove_lh, list) | |
615f59e0 | 129 | zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs); |
f3450c7b | 130 | |
de3dc572 | 131 | zfcp_adapter_unregister(adapter); |
1da177e4 LT |
132 | } |
133 | ||
134 | /** | |
135 | * zfcp_ccw_set_online - set_online function of zfcp driver | |
de3dc572 | 136 | * @cdev: pointer to belonging ccw device |
1da177e4 | 137 | * |
143bb6bf CS |
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. | |
1da177e4 | 146 | */ |
de3dc572 | 147 | static int zfcp_ccw_set_online(struct ccw_device *cdev) |
1da177e4 | 148 | { |
de3dc572 | 149 | struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); |
1da177e4 | 150 | |
143bb6bf | 151 | if (!adapter) { |
de3dc572 SS |
152 | adapter = zfcp_adapter_enqueue(cdev); |
153 | ||
154 | if (IS_ERR(adapter)) { | |
155 | dev_err(&cdev->dev, | |
143bb6bf CS |
156 | "Setting up data structures for the " |
157 | "FCP adapter failed\n"); | |
de3dc572 | 158 | return PTR_ERR(adapter); |
143bb6bf | 159 | } |
de3dc572 | 160 | kref_get(&adapter->ref); |
143bb6bf | 161 | } |
1da177e4 | 162 | |
fea9d6c7 | 163 | /* initialize request counter */ |
b6bd2fb9 | 164 | BUG_ON(!zfcp_reqlist_isempty(adapter->req_list)); |
fea9d6c7 VS |
165 | adapter->req_no = 0; |
166 | ||
c9ff5d03 | 167 | zfcp_ccw_activate(cdev); |
de3dc572 SS |
168 | zfcp_ccw_adapter_put(adapter); |
169 | return 0; | |
1da177e4 LT |
170 | } |
171 | ||
172 | /** | |
173 | * zfcp_ccw_set_offline - set_offline function of zfcp driver | |
de3dc572 | 174 | * @cdev: pointer to belonging ccw device |
1da177e4 LT |
175 | * |
176 | * This function gets called by the common i/o layer and sets an adapter | |
9f28745a | 177 | * into state offline. |
1da177e4 | 178 | */ |
de3dc572 | 179 | static int zfcp_ccw_set_offline(struct ccw_device *cdev) |
1da177e4 | 180 | { |
de3dc572 SS |
181 | struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); |
182 | ||
183 | if (!adapter) | |
184 | return 0; | |
1da177e4 | 185 | |
ea4a3a6a | 186 | zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1"); |
1da177e4 | 187 | zfcp_erp_wait(adapter); |
de3dc572 SS |
188 | |
189 | zfcp_ccw_adapter_put(adapter); | |
1da177e4 LT |
190 | return 0; |
191 | } | |
192 | ||
193 | /** | |
fa04c281 | 194 | * zfcp_ccw_notify - ccw notify function |
de3dc572 | 195 | * @cdev: pointer to belonging ccw device |
1da177e4 LT |
196 | * @event: indicates if adapter was detached or attached |
197 | * | |
198 | * This function gets called by the common i/o layer if an adapter has gone | |
199 | * or reappeared. | |
200 | */ | |
de3dc572 | 201 | static int zfcp_ccw_notify(struct ccw_device *cdev, int event) |
1da177e4 | 202 | { |
de3dc572 SS |
203 | struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); |
204 | ||
205 | if (!adapter) | |
206 | return 1; | |
1da177e4 | 207 | |
1da177e4 LT |
208 | switch (event) { |
209 | case CIO_GONE: | |
de3dc572 | 210 | dev_warn(&cdev->dev, "The FCP device has been detached\n"); |
ea4a3a6a | 211 | zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1"); |
1da177e4 LT |
212 | break; |
213 | case CIO_NO_PATH: | |
de3dc572 | 214 | dev_warn(&cdev->dev, |
ff3b24fa | 215 | "The CHPID for the FCP device is offline\n"); |
ea4a3a6a | 216 | zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2"); |
1da177e4 LT |
217 | break; |
218 | case CIO_OPER: | |
de3dc572 | 219 | dev_info(&cdev->dev, "The FCP device is operational again\n"); |
edaed859 SS |
220 | zfcp_erp_set_adapter_status(adapter, |
221 | ZFCP_STATUS_COMMON_RUNNING); | |
1f6f7129 | 222 | zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, |
ea4a3a6a | 223 | "ccnoti4"); |
1da177e4 | 224 | break; |
47593bfa | 225 | case CIO_BOXED: |
de3dc572 SS |
226 | dev_warn(&cdev->dev, "The FCP device did not respond within " |
227 | "the specified time\n"); | |
ea4a3a6a | 228 | zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5"); |
47593bfa | 229 | break; |
1da177e4 | 230 | } |
de3dc572 SS |
231 | |
232 | zfcp_ccw_adapter_put(adapter); | |
1da177e4 LT |
233 | return 1; |
234 | } | |
235 | ||
236 | /** | |
fa04c281 CS |
237 | * zfcp_ccw_shutdown - handle shutdown from cio |
238 | * @cdev: device for adapter to shutdown. | |
1da177e4 | 239 | */ |
fa04c281 | 240 | static void zfcp_ccw_shutdown(struct ccw_device *cdev) |
1da177e4 | 241 | { |
de3dc572 | 242 | struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); |
1da177e4 | 243 | |
1f99bd4c | 244 | if (!adapter) |
de3dc572 | 245 | return; |
1f99bd4c | 246 | |
ea4a3a6a | 247 | zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1"); |
1da177e4 | 248 | zfcp_erp_wait(adapter); |
143bb6bf | 249 | zfcp_erp_thread_kill(adapter); |
de3dc572 SS |
250 | |
251 | zfcp_ccw_adapter_put(adapter); | |
1da177e4 LT |
252 | } |
253 | ||
c5afd81e | 254 | struct ccw_driver zfcp_ccw_driver = { |
3bda058b SO |
255 | .driver = { |
256 | .owner = THIS_MODULE, | |
257 | .name = "zfcp", | |
258 | }, | |
fa04c281 CS |
259 | .ids = zfcp_ccw_device_id, |
260 | .probe = zfcp_ccw_probe, | |
261 | .remove = zfcp_ccw_remove, | |
262 | .set_online = zfcp_ccw_set_online, | |
263 | .set_offline = zfcp_ccw_set_offline, | |
264 | .notify = zfcp_ccw_notify, | |
265 | .shutdown = zfcp_ccw_shutdown, | |
b42aeceb | 266 | .freeze = zfcp_ccw_set_offline, |
daa70fa9 MP |
267 | .thaw = zfcp_ccw_activate, |
268 | .restore = zfcp_ccw_activate, | |
fa04c281 | 269 | }; |