4 * Registration and callback for the s390 common I/O layer.
6 * Copyright IBM Corporation 2002, 2009
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #define ZFCP_MODEL_PRIV 0x4
16 static int zfcp_ccw_suspend(struct ccw_device *cdev)
19 struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);
24 mutex_lock(&zfcp_data.config_mutex);
26 zfcp_erp_adapter_shutdown(adapter, 0, "ccsusp1", NULL);
27 zfcp_erp_wait(adapter);
29 mutex_unlock(&zfcp_data.config_mutex);
34 static int zfcp_ccw_activate(struct ccw_device *cdev)
37 struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);
42 zfcp_erp_modify_adapter_status(adapter, "ccresu1", NULL,
43 ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
44 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
46 zfcp_erp_wait(adapter);
47 flush_work(&adapter->scan_work);
52 static struct ccw_device_id zfcp_ccw_device_id[] = {
53 { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
54 { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
57 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
60 * zfcp_ccw_priv_sch - check if subchannel is privileged
61 * @adapter: Adapter/Subchannel to check
63 int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
65 return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
69 * zfcp_ccw_probe - probe function of zfcp driver
70 * @ccw_device: pointer to belonging ccw device
72 * This function gets called by the common i/o layer for each FCP
73 * device found on the current system. This is only a stub to make cio
74 * work: To only allocate adapter resources for devices actually used,
75 * the allocation is deferred to the first call to ccw_set_online.
77 static int zfcp_ccw_probe(struct ccw_device *ccw_device)
83 * zfcp_ccw_remove - remove function of zfcp driver
84 * @ccw_device: pointer to belonging ccw device
86 * This function gets called by the common i/o layer and removes an adapter
87 * from the system. Task of this function is to get rid of all units and
88 * ports that belong to this adapter. And in addition all resources of this
89 * adapter will be freed too.
91 static void zfcp_ccw_remove(struct ccw_device *ccw_device)
93 struct zfcp_adapter *adapter;
94 struct zfcp_port *port, *p;
95 struct zfcp_unit *unit, *u;
96 LIST_HEAD(unit_remove_lh);
97 LIST_HEAD(port_remove_lh);
99 ccw_device_set_offline(ccw_device);
101 mutex_lock(&zfcp_data.config_mutex);
102 adapter = dev_get_drvdata(&ccw_device->dev);
106 write_lock_irq(&zfcp_data.config_lock);
107 list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
108 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
109 list_move(&unit->list, &unit_remove_lh);
110 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
113 list_move(&port->list, &port_remove_lh);
114 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
116 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
117 write_unlock_irq(&zfcp_data.config_lock);
119 list_for_each_entry_safe(port, p, &port_remove_lh, list) {
120 list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
122 scsi_remove_device(unit->device);
123 zfcp_unit_dequeue(unit);
125 zfcp_port_dequeue(port);
127 wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
128 zfcp_adapter_dequeue(adapter);
131 mutex_unlock(&zfcp_data.config_mutex);
135 * zfcp_ccw_set_online - set_online function of zfcp driver
136 * @ccw_device: pointer to belonging ccw device
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.
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.
147 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
149 struct zfcp_adapter *adapter;
152 mutex_lock(&zfcp_data.config_mutex);
153 adapter = dev_get_drvdata(&ccw_device->dev);
156 ret = zfcp_adapter_enqueue(ccw_device);
158 dev_err(&ccw_device->dev,
159 "Setting up data structures for the "
160 "FCP adapter failed\n");
163 adapter = dev_get_drvdata(&ccw_device->dev);
166 /* initialize request counter */
167 BUG_ON(!zfcp_reqlist_isempty(adapter));
170 zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
171 ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
172 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
174 zfcp_erp_wait(adapter);
176 mutex_unlock(&zfcp_data.config_mutex);
178 flush_work(&adapter->scan_work);
183 * zfcp_ccw_set_offline - set_offline function of zfcp driver
184 * @ccw_device: pointer to belonging ccw device
186 * This function gets called by the common i/o layer and sets an adapter
187 * into state offline.
189 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
191 struct zfcp_adapter *adapter;
193 mutex_lock(&zfcp_data.config_mutex);
194 adapter = dev_get_drvdata(&ccw_device->dev);
198 zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
199 zfcp_erp_wait(adapter);
200 mutex_unlock(&zfcp_data.config_mutex);
206 * zfcp_ccw_notify - ccw notify function
207 * @ccw_device: pointer to belonging ccw device
208 * @event: indicates if adapter was detached or attached
210 * This function gets called by the common i/o layer if an adapter has gone
213 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
215 struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
219 dev_warn(&adapter->ccw_device->dev,
220 "The FCP device has been detached\n");
221 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
224 dev_warn(&adapter->ccw_device->dev,
225 "The CHPID for the FCP device is offline\n");
226 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
229 dev_info(&adapter->ccw_device->dev,
230 "The FCP device is operational again\n");
231 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
232 ZFCP_STATUS_COMMON_RUNNING,
234 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
238 dev_warn(&adapter->ccw_device->dev, "The FCP device "
239 "did not respond within the specified time\n");
240 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
247 * zfcp_ccw_shutdown - handle shutdown from cio
248 * @cdev: device for adapter to shutdown.
250 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
252 struct zfcp_adapter *adapter;
254 mutex_lock(&zfcp_data.config_mutex);
255 adapter = dev_get_drvdata(&cdev->dev);
256 zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
257 zfcp_erp_wait(adapter);
258 zfcp_erp_thread_kill(adapter);
259 mutex_unlock(&zfcp_data.config_mutex);
262 static struct ccw_driver zfcp_ccw_driver = {
263 .owner = THIS_MODULE,
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_suspend,
273 .thaw = zfcp_ccw_activate,
274 .restore = zfcp_ccw_activate,
278 * zfcp_ccw_register - ccw register function
280 * Registers the driver at the common i/o layer. This function will be called
281 * at module load time/system start.
283 int __init zfcp_ccw_register(void)
285 return ccw_driver_register(&zfcp_ccw_driver);
289 * zfcp_get_adapter_by_busid - find zfcp_adapter struct
290 * @busid: bus id string of zfcp adapter to find
292 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
294 struct ccw_device *ccw_device;
295 struct zfcp_adapter *adapter = NULL;
297 ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
299 adapter = dev_get_drvdata(&ccw_device->dev);
300 put_device(&ccw_device->dev);