1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_ccw.c b/drivers/s390/scsi/zfcp_ccw.c
new file mode 100644
index 0000000000..bdf2cc1ea7
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_ccw.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * zfcp device driver
+ *
+ * Registration and callback for the s390 common I/O layer.
+ *
+ * Copyright IBM Corp. 2002, 2010
+ */
+
+#define KMSG_COMPONENT "zfcp"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include "zfcp_ext.h"
+#include "zfcp_reqlist.h"
+
+#define ZFCP_MODEL_PRIV 0x4
+
+static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
+
+struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
+{
+	struct zfcp_adapter *adapter;
+	unsigned long flags;
+
+	spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
+	adapter = dev_get_drvdata(&cdev->dev);
+	if (adapter)
+		kref_get(&adapter->ref);
+	spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
+	return adapter;
+}
+
+void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
+	kref_put(&adapter->ref, zfcp_adapter_release);
+	spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
+}
+
+/**
+ * zfcp_ccw_activate - activate adapter and wait for it to finish
+ * @cdev: pointer to belonging ccw device
+ * @clear: Status flags to clear.
+ * @tag: s390dbf trace record tag
+ */
+static int zfcp_ccw_activate(struct ccw_device *cdev, int clear, char *tag)
+{
+	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
+
+	if (!adapter)
+		return 0;
+
+	zfcp_erp_clear_adapter_status(adapter, clear);
+	zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING);
+	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
+				tag);
+
+	/*
+	 * We want to scan ports here, with some random backoff and without
+	 * rate limit. Recovery has already scheduled a port scan for us,
+	 * but with both random delay and rate limit. Nevertheless we get
+	 * what we want here by flushing the scheduled work after sleeping
+	 * an equivalent random time.
+	 * Let the port scan random delay elapse first. If recovery finishes
+	 * up to that point in time, that would be perfect for both recovery
+	 * and port scan. If not, i.e. recovery takes ages, there was no
+	 * point in waiting a random delay on top of the time consumed by
+	 * recovery.
+	 */
+	msleep(zfcp_fc_port_scan_backoff());
+	zfcp_erp_wait(adapter);
+	flush_delayed_work(&adapter->scan_work);
+
+	zfcp_ccw_adapter_put(adapter);
+
+	return 0;
+}
+
+static struct ccw_device_id zfcp_ccw_device_id[] = {
+	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
+	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
+	{},
+};
+MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
+
+/**
+ * zfcp_ccw_probe - probe function of zfcp driver
+ * @cdev: pointer to belonging ccw device
+ *
+ * This function gets called by the common i/o layer for each FCP
+ * device found on the current system. This is only a stub to make cio
+ * work: To only allocate adapter resources for devices actually used,
+ * the allocation is deferred to the first call to ccw_set_online.
+ */
+static int zfcp_ccw_probe(struct ccw_device *cdev)
+{
+	return 0;
+}
+
+/**
+ * zfcp_ccw_remove - remove function of zfcp driver
+ * @cdev: pointer to belonging ccw device
+ *
+ * This function gets called by the common i/o layer and removes an adapter
+ * from the system. Task of this function is to get rid of all units and
+ * ports that belong to this adapter. And in addition all resources of this
+ * adapter will be freed too.
+ */
+static void zfcp_ccw_remove(struct ccw_device *cdev)
+{
+	struct zfcp_adapter *adapter;
+	struct zfcp_port *port, *p;
+	struct zfcp_unit *unit, *u;
+	LIST_HEAD(unit_remove_lh);
+	LIST_HEAD(port_remove_lh);
+
+	ccw_device_set_offline(cdev);
+
+	adapter = zfcp_ccw_adapter_by_cdev(cdev);
+	if (!adapter)
+		return;
+
+	write_lock_irq(&adapter->port_list_lock);
+	list_for_each_entry(port, &adapter->port_list, list) {
+		write_lock(&port->unit_list_lock);
+		list_splice_init(&port->unit_list, &unit_remove_lh);
+		write_unlock(&port->unit_list_lock);
+	}
+	list_splice_init(&adapter->port_list, &port_remove_lh);
+	write_unlock_irq(&adapter->port_list_lock);
+	zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */
+
+	list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
+		device_unregister(&unit->dev);
+
+	list_for_each_entry_safe(port, p, &port_remove_lh, list)
+		device_unregister(&port->dev);
+
+	zfcp_adapter_unregister(adapter);
+}
+
+/**
+ * zfcp_ccw_set_online - set_online function of zfcp driver
+ * @cdev: pointer to belonging ccw device
+ *
+ * This function gets called by the common i/o layer and sets an
+ * adapter into state online.  The first call will allocate all
+ * adapter resources that will be retained until the device is removed
+ * via zfcp_ccw_remove.
+ *
+ * Setting an fcp device online means that it will be registered with
+ * the SCSI stack, that the QDIO queues will be set up and that the
+ * adapter will be opened.
+ */
+static int zfcp_ccw_set_online(struct ccw_device *cdev)
+{
+	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
+
+	if (!adapter) {
+		adapter = zfcp_adapter_enqueue(cdev);
+
+		if (IS_ERR(adapter)) {
+			dev_err(&cdev->dev,
+				"Setting up data structures for the "
+				"FCP adapter failed\n");
+			return PTR_ERR(adapter);
+		}
+		kref_get(&adapter->ref);
+	}
+
+	/* initialize request counter */
+	BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
+	adapter->req_no = 0;
+
+	zfcp_ccw_activate(cdev, 0, "ccsonl1");
+
+	/*
+	 * We want to scan ports here, always, with some random delay and
+	 * without rate limit - basically what zfcp_ccw_activate() has
+	 * achieved for us. Not quite! That port scan depended on
+	 * !no_auto_port_rescan. So let's cover the no_auto_port_rescan
+	 * case here to make sure a port scan is done unconditionally.
+	 * Since zfcp_ccw_activate() has waited the desired random time,
+	 * we can immediately schedule and flush a port scan for the
+	 * remaining cases.
+	 */
+	zfcp_fc_inverse_conditional_port_scan(adapter);
+	flush_delayed_work(&adapter->scan_work);
+	zfcp_ccw_adapter_put(adapter);
+	return 0;
+}
+
+/**
+ * zfcp_ccw_set_offline - set_offline function of zfcp driver
+ * @cdev: pointer to belonging ccw device
+ *
+ * This function gets called by the common i/o layer and sets an adapter
+ * into state offline.
+ */
+static int zfcp_ccw_set_offline(struct ccw_device *cdev)
+{
+	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
+
+	if (!adapter)
+		return 0;
+
+	zfcp_erp_set_adapter_status(adapter, 0);
+	zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1");
+	zfcp_erp_wait(adapter);
+
+	zfcp_ccw_adapter_put(adapter);
+	return 0;
+}
+
+/**
+ * zfcp_ccw_notify - ccw notify function
+ * @cdev: pointer to belonging ccw device
+ * @event: indicates if adapter was detached or attached
+ *
+ * This function gets called by the common i/o layer if an adapter has gone
+ * or reappeared.
+ */
+static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
+{
+	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
+
+	if (!adapter)
+		return 1;
+
+	switch (event) {
+	case CIO_GONE:
+		dev_warn(&cdev->dev, "The FCP device has been detached\n");
+		zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1");
+		break;
+	case CIO_NO_PATH:
+		dev_warn(&cdev->dev,
+			 "The CHPID for the FCP device is offline\n");
+		zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2");
+		break;
+	case CIO_OPER:
+		dev_info(&cdev->dev, "The FCP device is operational again\n");
+		zfcp_erp_set_adapter_status(adapter,
+					    ZFCP_STATUS_COMMON_RUNNING);
+		zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
+					"ccnoti4");
+		break;
+	case CIO_BOXED:
+		dev_warn(&cdev->dev, "The FCP device did not respond within "
+				     "the specified time\n");
+		zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5");
+		break;
+	}
+
+	zfcp_ccw_adapter_put(adapter);
+	return 1;
+}
+
+/**
+ * zfcp_ccw_shutdown - handle shutdown from cio
+ * @cdev: device for adapter to shutdown.
+ */
+static void zfcp_ccw_shutdown(struct ccw_device *cdev)
+{
+	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
+
+	if (!adapter)
+		return;
+
+	zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1");
+	zfcp_erp_wait(adapter);
+	zfcp_erp_thread_kill(adapter);
+
+	zfcp_ccw_adapter_put(adapter);
+}
+
+struct ccw_driver zfcp_ccw_driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= "zfcp",
+	},
+	.ids         = zfcp_ccw_device_id,
+	.probe       = zfcp_ccw_probe,
+	.remove      = zfcp_ccw_remove,
+	.set_online  = zfcp_ccw_set_online,
+	.set_offline = zfcp_ccw_set_offline,
+	.notify      = zfcp_ccw_notify,
+	.shutdown    = zfcp_ccw_shutdown,
+};