4 * Registration and callback for the s390 common I/O layer.
6 * Copyright IBM Corp. 2002, 2010
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12 #include <linux/module.h>
14 #include "zfcp_reqlist.h"
16 #define ZFCP_MODEL_PRIV 0x4
18 static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
20 struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
22 struct zfcp_adapter *adapter;
25 spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
26 adapter = dev_get_drvdata(&cdev->dev);
28 kref_get(&adapter->ref);
29 spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
33 void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
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);
42 static int zfcp_ccw_activate(struct ccw_device *cdev)
45 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
50 zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING);
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->dev, &zfcp_sysfs_unit_attrs);
128 list_for_each_entry_safe(port, p, &port_remove_lh, list)
129 zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs);
131 zfcp_adapter_unregister(adapter);
135 * zfcp_ccw_set_online - set_online function of zfcp driver
136 * @cdev: 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 *cdev)
149 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
152 adapter = zfcp_adapter_enqueue(cdev);
154 if (IS_ERR(adapter)) {
156 "Setting up data structures for the "
157 "FCP adapter failed\n");
158 return PTR_ERR(adapter);
160 kref_get(&adapter->ref);
163 /* initialize request counter */
164 BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
167 zfcp_ccw_activate(cdev);
168 zfcp_ccw_adapter_put(adapter);
173 * zfcp_ccw_set_offline - set_offline function of zfcp driver
174 * @cdev: pointer to belonging ccw device
176 * This function gets called by the common i/o layer and sets an adapter
177 * into state offline.
179 static int zfcp_ccw_set_offline(struct ccw_device *cdev)
181 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
186 zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1");
187 zfcp_erp_wait(adapter);
189 zfcp_ccw_adapter_put(adapter);
194 * zfcp_ccw_notify - ccw notify function
195 * @cdev: pointer to belonging ccw device
196 * @event: indicates if adapter was detached or attached
198 * This function gets called by the common i/o layer if an adapter has gone
201 static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
203 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
210 dev_warn(&cdev->dev, "The FCP device has been detached\n");
211 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1");
215 "The CHPID for the FCP device is offline\n");
216 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2");
219 dev_info(&cdev->dev, "The FCP device is operational again\n");
220 zfcp_erp_set_adapter_status(adapter,
221 ZFCP_STATUS_COMMON_RUNNING);
222 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
226 dev_warn(&cdev->dev, "The FCP device did not respond within "
227 "the specified time\n");
228 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5");
232 zfcp_ccw_adapter_put(adapter);
237 * zfcp_ccw_shutdown - handle shutdown from cio
238 * @cdev: device for adapter to shutdown.
240 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
242 struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
247 zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1");
248 zfcp_erp_wait(adapter);
249 zfcp_erp_thread_kill(adapter);
251 zfcp_ccw_adapter_put(adapter);
254 struct ccw_driver zfcp_ccw_driver = {
256 .owner = THIS_MODULE,
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,
266 .freeze = zfcp_ccw_set_offline,
267 .thaw = zfcp_ccw_activate,
268 .restore = zfcp_ccw_activate,