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
13 #include "zfcp_reqlist.h"
15 #define ZFCP_MODEL_PRIV 0x4
17 static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
19 struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
21 struct zfcp_adapter *adapter;
24 spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
25 adapter = dev_get_drvdata(&cdev->dev);
27 kref_get(&adapter->ref);
28 spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
32 void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
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);
41 static int zfcp_ccw_activate(struct ccw_device *cdev)
44 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
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,
53 zfcp_erp_wait(adapter);
54 flush_work(&adapter->scan_work);
56 zfcp_ccw_adapter_put(adapter);
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) },
66 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
69 * zfcp_ccw_priv_sch - check if subchannel is privileged
70 * @adapter: Adapter/Subchannel to check
72 int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
74 return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
78 * zfcp_ccw_probe - probe function of zfcp driver
79 * @cdev: pointer to belonging ccw device
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.
86 static int zfcp_ccw_probe(struct ccw_device *cdev)
92 * zfcp_ccw_remove - remove function of zfcp driver
93 * @cdev: pointer to belonging ccw device
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.
100 static void zfcp_ccw_remove(struct ccw_device *cdev)
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);
108 ccw_device_set_offline(cdev);
110 adapter = zfcp_ccw_adapter_by_cdev(cdev);
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);
122 write_unlock_irq(&adapter->port_list_lock);
123 zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */
125 list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
126 zfcp_device_unregister(&unit->sysfs_device,
127 &zfcp_sysfs_unit_attrs);
129 list_for_each_entry_safe(port, p, &port_remove_lh, list)
130 zfcp_device_unregister(&port->sysfs_device,
131 &zfcp_sysfs_port_attrs);
133 zfcp_adapter_unregister(adapter);
137 * zfcp_ccw_set_online - set_online function of zfcp driver
138 * @cdev: pointer to belonging ccw device
140 * This function gets called by the common i/o layer and sets an
141 * adapter into state online. The first call will allocate all
142 * adapter resources that will be retained until the device is removed
143 * via zfcp_ccw_remove.
145 * Setting an fcp device online means that it will be registered with
146 * the SCSI stack, that the QDIO queues will be set up and that the
147 * adapter will be opened.
149 static int zfcp_ccw_set_online(struct ccw_device *cdev)
151 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
154 adapter = zfcp_adapter_enqueue(cdev);
156 if (IS_ERR(adapter)) {
158 "Setting up data structures for the "
159 "FCP adapter failed\n");
160 return PTR_ERR(adapter);
162 kref_get(&adapter->ref);
165 /* initialize request counter */
166 BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
169 zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
170 ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
171 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
173 zfcp_erp_wait(adapter);
175 flush_work(&adapter->scan_work);
177 zfcp_ccw_adapter_put(adapter);
182 * zfcp_ccw_set_offline - set_offline function of zfcp driver
183 * @cdev: pointer to belonging ccw device
185 * This function gets called by the common i/o layer and sets an adapter
186 * into state offline.
188 static int zfcp_ccw_set_offline(struct ccw_device *cdev)
190 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
195 zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
196 zfcp_erp_wait(adapter);
198 zfcp_ccw_adapter_put(adapter);
203 * zfcp_ccw_notify - ccw notify function
204 * @cdev: pointer to belonging ccw device
205 * @event: indicates if adapter was detached or attached
207 * This function gets called by the common i/o layer if an adapter has gone
210 static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
212 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
219 dev_warn(&cdev->dev, "The FCP device has been detached\n");
220 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
224 "The CHPID for the FCP device is offline\n");
225 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
228 dev_info(&cdev->dev, "The FCP device is operational again\n");
229 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
230 ZFCP_STATUS_COMMON_RUNNING,
232 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
236 dev_warn(&cdev->dev, "The FCP device did not respond within "
237 "the specified time\n");
238 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
242 zfcp_ccw_adapter_put(adapter);
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 = zfcp_ccw_adapter_by_cdev(cdev);
257 zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
258 zfcp_erp_wait(adapter);
259 zfcp_erp_thread_kill(adapter);
261 zfcp_ccw_adapter_put(adapter);
264 struct ccw_driver zfcp_ccw_driver = {
265 .owner = THIS_MODULE,
267 .ids = zfcp_ccw_device_id,
268 .probe = zfcp_ccw_probe,
269 .remove = zfcp_ccw_remove,
270 .set_online = zfcp_ccw_set_online,
271 .set_offline = zfcp_ccw_set_offline,
272 .notify = zfcp_ccw_notify,
273 .shutdown = zfcp_ccw_shutdown,
274 .freeze = zfcp_ccw_set_offline,
275 .thaw = zfcp_ccw_activate,
276 .restore = zfcp_ccw_activate,