248 lines
6.8 KiB
C
248 lines
6.8 KiB
C
/*
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* zfcp device driver
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*
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* Registration and callback for the s390 common I/O layer.
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*
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* Copyright IBM Corporation 2002, 2008
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*/
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#include "zfcp_ext.h"
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/**
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* zfcp_ccw_probe - probe function of zfcp driver
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* @ccw_device: pointer to belonging ccw device
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*
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* This function gets called by the common i/o layer and sets up the initial
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* data structures for each fcp adapter, which was detected by the system.
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* Also the sysfs files for this adapter will be created by this function.
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* In addition the nameserver port will be added to the ports of the adapter
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* and its sysfs representation will be created too.
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*/
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static int zfcp_ccw_probe(struct ccw_device *ccw_device)
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{
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int retval = 0;
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down(&zfcp_data.config_sema);
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if (zfcp_adapter_enqueue(ccw_device)) {
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dev_err(&ccw_device->dev,
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"Setting up data structures for the "
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"FCP adapter failed\n");
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retval = -EINVAL;
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}
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up(&zfcp_data.config_sema);
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return retval;
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}
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/**
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* zfcp_ccw_remove - remove function of zfcp driver
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* @ccw_device: pointer to belonging ccw device
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*
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* This function gets called by the common i/o layer and removes an adapter
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* from the system. Task of this function is to get rid of all units and
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* ports that belong to this adapter. And in addition all resources of this
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* adapter will be freed too.
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*/
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static void zfcp_ccw_remove(struct ccw_device *ccw_device)
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{
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struct zfcp_adapter *adapter;
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struct zfcp_port *port, *p;
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struct zfcp_unit *unit, *u;
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LIST_HEAD(unit_remove_lh);
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LIST_HEAD(port_remove_lh);
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ccw_device_set_offline(ccw_device);
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down(&zfcp_data.config_sema);
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adapter = dev_get_drvdata(&ccw_device->dev);
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write_lock_irq(&zfcp_data.config_lock);
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list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
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list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
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list_move(&unit->list, &unit_remove_lh);
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atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
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&unit->status);
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}
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list_move(&port->list, &port_remove_lh);
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atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
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}
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atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
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write_unlock_irq(&zfcp_data.config_lock);
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list_for_each_entry_safe(port, p, &port_remove_lh, list) {
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list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
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if (atomic_read(&unit->status) &
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ZFCP_STATUS_UNIT_REGISTERED)
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scsi_remove_device(unit->device);
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zfcp_unit_dequeue(unit);
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}
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zfcp_port_dequeue(port);
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}
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wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
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zfcp_adapter_dequeue(adapter);
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up(&zfcp_data.config_sema);
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}
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/**
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* zfcp_ccw_set_online - set_online function of zfcp driver
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* @ccw_device: pointer to belonging ccw device
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*
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* This function gets called by the common i/o layer and sets an adapter
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* into state online. Setting an fcp device online means that it will be
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* registered with the SCSI stack, that the QDIO queues will be set up
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* and that the adapter will be opened (asynchronously).
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*/
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static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
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{
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struct zfcp_adapter *adapter;
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int retval;
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down(&zfcp_data.config_sema);
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adapter = dev_get_drvdata(&ccw_device->dev);
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retval = zfcp_erp_thread_setup(adapter);
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if (retval)
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goto out;
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retval = zfcp_adapter_scsi_register(adapter);
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if (retval)
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goto out_scsi_register;
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/* initialize request counter */
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BUG_ON(!zfcp_reqlist_isempty(adapter));
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adapter->req_no = 0;
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zfcp_erp_modify_adapter_status(adapter, 10, NULL,
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ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
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zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
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NULL);
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zfcp_erp_wait(adapter);
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up(&zfcp_data.config_sema);
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flush_work(&adapter->scan_work);
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return 0;
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out_scsi_register:
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zfcp_erp_thread_kill(adapter);
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out:
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up(&zfcp_data.config_sema);
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return retval;
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}
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/**
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* zfcp_ccw_set_offline - set_offline function of zfcp driver
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* @ccw_device: pointer to belonging ccw device
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*
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* This function gets called by the common i/o layer and sets an adapter
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* into state offline.
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*/
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static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
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{
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struct zfcp_adapter *adapter;
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down(&zfcp_data.config_sema);
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adapter = dev_get_drvdata(&ccw_device->dev);
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zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
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zfcp_erp_wait(adapter);
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zfcp_erp_thread_kill(adapter);
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up(&zfcp_data.config_sema);
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return 0;
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}
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/**
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* zfcp_ccw_notify - ccw notify function
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* @ccw_device: pointer to belonging ccw device
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* @event: indicates if adapter was detached or attached
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*
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* This function gets called by the common i/o layer if an adapter has gone
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* or reappeared.
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*/
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static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
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{
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struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
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switch (event) {
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case CIO_GONE:
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dev_warn(&adapter->ccw_device->dev,
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"The FCP device has been detached\n");
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zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
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break;
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case CIO_NO_PATH:
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dev_warn(&adapter->ccw_device->dev,
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"The CHPID for the FCP device is offline\n");
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zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
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break;
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case CIO_OPER:
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dev_info(&adapter->ccw_device->dev,
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"The FCP device is operational again\n");
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zfcp_erp_modify_adapter_status(adapter, 11, NULL,
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ZFCP_STATUS_COMMON_RUNNING,
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ZFCP_SET);
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zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
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89, NULL);
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break;
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}
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return 1;
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}
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/**
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* zfcp_ccw_shutdown - handle shutdown from cio
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* @cdev: device for adapter to shutdown.
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*/
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static void zfcp_ccw_shutdown(struct ccw_device *cdev)
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{
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struct zfcp_adapter *adapter;
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down(&zfcp_data.config_sema);
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adapter = dev_get_drvdata(&cdev->dev);
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zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
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zfcp_erp_wait(adapter);
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up(&zfcp_data.config_sema);
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}
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static struct ccw_device_id zfcp_ccw_device_id[] = {
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{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
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{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
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{},
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};
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MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
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static struct ccw_driver zfcp_ccw_driver = {
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.owner = THIS_MODULE,
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.name = "zfcp",
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.ids = zfcp_ccw_device_id,
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.probe = zfcp_ccw_probe,
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.remove = zfcp_ccw_remove,
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.set_online = zfcp_ccw_set_online,
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.set_offline = zfcp_ccw_set_offline,
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.notify = zfcp_ccw_notify,
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.shutdown = zfcp_ccw_shutdown,
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};
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/**
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* zfcp_ccw_register - ccw register function
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*
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* Registers the driver at the common i/o layer. This function will be called
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* at module load time/system start.
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*/
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int __init zfcp_ccw_register(void)
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{
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return ccw_driver_register(&zfcp_ccw_driver);
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}
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/**
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* zfcp_get_adapter_by_busid - find zfcp_adapter struct
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* @busid: bus id string of zfcp adapter to find
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*/
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struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
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{
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struct ccw_device *ccw_device;
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struct zfcp_adapter *adapter = NULL;
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ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
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if (ccw_device) {
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adapter = dev_get_drvdata(&ccw_device->dev);
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put_device(&ccw_device->dev);
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}
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return adapter;
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}
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