342 lines
9.6 KiB
C
342 lines
9.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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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 Corp. 2002, 2010
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include "zfcp_ext.h"
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#include "zfcp_reqlist.h"
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#define ZFCP_MODEL_PRIV 0x4
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static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
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struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
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{
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struct zfcp_adapter *adapter;
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unsigned long flags;
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spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
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adapter = dev_get_drvdata(&cdev->dev);
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if (adapter)
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kref_get(&adapter->ref);
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spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
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return adapter;
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}
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void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
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{
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unsigned long flags;
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spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
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kref_put(&adapter->ref, zfcp_adapter_release);
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spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
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}
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/**
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* zfcp_ccw_activate - activate adapter and wait for it to finish
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* @cdev: pointer to belonging ccw device
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* @clear: Status flags to clear.
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* @tag: s390dbf trace record tag
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*/
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static int zfcp_ccw_activate(struct ccw_device *cdev, int clear, char *tag)
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{
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struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
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if (!adapter)
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return 0;
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zfcp_erp_clear_adapter_status(adapter, clear);
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zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING);
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zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
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tag);
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/*
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* We want to scan ports here, with some random backoff and without
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* rate limit. Recovery has already scheduled a port scan for us,
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* but with both random delay and rate limit. Nevertheless we get
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* what we want here by flushing the scheduled work after sleeping
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* an equivalent random time.
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* Let the port scan random delay elapse first. If recovery finishes
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* up to that point in time, that would be perfect for both recovery
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* and port scan. If not, i.e. recovery takes ages, there was no
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* point in waiting a random delay on top of the time consumed by
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* recovery.
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*/
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msleep(zfcp_fc_port_scan_backoff());
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zfcp_erp_wait(adapter);
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flush_delayed_work(&adapter->scan_work);
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zfcp_ccw_adapter_put(adapter);
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return 0;
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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, ZFCP_MODEL_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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/**
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* zfcp_ccw_probe - probe function of zfcp driver
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* @cdev: pointer to belonging ccw device
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*
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* This function gets called by the common i/o layer for each FCP
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* device found on the current system. This is only a stub to make cio
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* work: To only allocate adapter resources for devices actually used,
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* the allocation is deferred to the first call to ccw_set_online.
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*/
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static int zfcp_ccw_probe(struct ccw_device *cdev)
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{
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return 0;
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}
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/**
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* zfcp_ccw_remove - remove function of zfcp driver
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* @cdev: 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 *cdev)
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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(cdev);
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adapter = zfcp_ccw_adapter_by_cdev(cdev);
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if (!adapter)
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return;
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write_lock_irq(&adapter->port_list_lock);
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list_for_each_entry_safe(port, p, &adapter->port_list, list) {
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write_lock(&port->unit_list_lock);
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list_for_each_entry_safe(unit, u, &port->unit_list, list)
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list_move(&unit->list, &unit_remove_lh);
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write_unlock(&port->unit_list_lock);
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list_move(&port->list, &port_remove_lh);
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}
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write_unlock_irq(&adapter->port_list_lock);
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zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */
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list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
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device_unregister(&unit->dev);
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list_for_each_entry_safe(port, p, &port_remove_lh, list)
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device_unregister(&port->dev);
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zfcp_adapter_unregister(adapter);
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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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* @cdev: 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
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* adapter into state online. The first call will allocate all
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* adapter resources that will be retained until the device is removed
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* via zfcp_ccw_remove.
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*
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* Setting an fcp device online means that it will be registered with
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* the SCSI stack, that the QDIO queues will be set up and that the
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* adapter will be opened.
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*/
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static int zfcp_ccw_set_online(struct ccw_device *cdev)
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{
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struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
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if (!adapter) {
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adapter = zfcp_adapter_enqueue(cdev);
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if (IS_ERR(adapter)) {
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dev_err(&cdev->dev,
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"Setting up data structures for the "
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"FCP adapter failed\n");
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return PTR_ERR(adapter);
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}
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kref_get(&adapter->ref);
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}
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/* initialize request counter */
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BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
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adapter->req_no = 0;
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zfcp_ccw_activate(cdev, 0, "ccsonl1");
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/*
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* We want to scan ports here, always, with some random delay and
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* without rate limit - basically what zfcp_ccw_activate() has
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* achieved for us. Not quite! That port scan depended on
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* !no_auto_port_rescan. So let's cover the no_auto_port_rescan
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* case here to make sure a port scan is done unconditionally.
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* Since zfcp_ccw_activate() has waited the desired random time,
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* we can immediately schedule and flush a port scan for the
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* remaining cases.
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*/
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zfcp_fc_inverse_conditional_port_scan(adapter);
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flush_delayed_work(&adapter->scan_work);
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zfcp_ccw_adapter_put(adapter);
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return 0;
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}
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/**
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* zfcp_ccw_offline_sync - shut down adapter and wait for it to finish
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* @cdev: pointer to belonging ccw device
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* @set: Status flags to set.
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* @tag: s390dbf trace record tag
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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_offline_sync(struct ccw_device *cdev, int set, char *tag)
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{
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struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
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if (!adapter)
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return 0;
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zfcp_erp_set_adapter_status(adapter, set);
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zfcp_erp_adapter_shutdown(adapter, 0, tag);
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zfcp_erp_wait(adapter);
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zfcp_ccw_adapter_put(adapter);
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return 0;
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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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* @cdev: 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 *cdev)
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{
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return zfcp_ccw_offline_sync(cdev, 0, "ccsoff1");
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}
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/**
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* zfcp_ccw_notify - ccw notify function
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* @cdev: 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 *cdev, int event)
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{
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struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
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if (!adapter)
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return 1;
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switch (event) {
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case CIO_GONE:
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if (atomic_read(&adapter->status) &
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ZFCP_STATUS_ADAPTER_SUSPENDED) { /* notification ignore */
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zfcp_dbf_hba_basic("ccnigo1", adapter);
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break;
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}
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dev_warn(&cdev->dev, "The FCP device has been detached\n");
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zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1");
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break;
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case CIO_NO_PATH:
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dev_warn(&cdev->dev,
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"The CHPID for the FCP device is offline\n");
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zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2");
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break;
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case CIO_OPER:
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if (atomic_read(&adapter->status) &
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ZFCP_STATUS_ADAPTER_SUSPENDED) { /* notification ignore */
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zfcp_dbf_hba_basic("ccniop1", adapter);
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break;
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}
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dev_info(&cdev->dev, "The FCP device is operational again\n");
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zfcp_erp_set_adapter_status(adapter,
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ZFCP_STATUS_COMMON_RUNNING);
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zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
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"ccnoti4");
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break;
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case CIO_BOXED:
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dev_warn(&cdev->dev, "The FCP device did not respond within "
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"the specified time\n");
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zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5");
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break;
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}
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zfcp_ccw_adapter_put(adapter);
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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 = zfcp_ccw_adapter_by_cdev(cdev);
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if (!adapter)
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return;
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zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1");
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zfcp_erp_wait(adapter);
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zfcp_erp_thread_kill(adapter);
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zfcp_ccw_adapter_put(adapter);
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}
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static int zfcp_ccw_suspend(struct ccw_device *cdev)
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{
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zfcp_ccw_offline_sync(cdev, ZFCP_STATUS_ADAPTER_SUSPENDED, "ccsusp1");
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return 0;
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}
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static int zfcp_ccw_thaw(struct ccw_device *cdev)
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{
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/* trace records for thaw and final shutdown during suspend
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can only be found in system dump until the end of suspend
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but not after resume because it's based on the memory image
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right after the very first suspend (freeze) callback */
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zfcp_ccw_activate(cdev, 0, "ccthaw1");
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return 0;
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}
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static int zfcp_ccw_resume(struct ccw_device *cdev)
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{
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zfcp_ccw_activate(cdev, ZFCP_STATUS_ADAPTER_SUSPENDED, "ccresu1");
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return 0;
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}
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struct ccw_driver zfcp_ccw_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "zfcp",
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},
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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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.freeze = zfcp_ccw_suspend,
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.thaw = zfcp_ccw_thaw,
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.restore = zfcp_ccw_resume,
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};
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