linux/drivers/s390/scsi/zfcp_sysfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 * zfcp device driver
 *
 * sysfs attributes.
 *
 * Copyright IBM Corp. 2008, 2010
 */

#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/slab.h>
#include "zfcp_diag.h"
#include "zfcp_ext.h"

#define ZFCP_DEV_ATTR(_feat, _name, _mode, _show, _store) \
struct device_attribute dev_attr_##_feat##_##_name = __ATTR(_name, _mode,\
							    _show, _store)
#define ZFCP_DEFINE_ATTR(_feat_def, _feat, _name, _format, _value)	       \
static ssize_t zfcp_sysfs_##_feat##_##_name##_show(struct device *dev,	       \
						   struct device_attribute *at,\
						   char *buf)		       \
{									       \
	struct _feat_def *_feat = container_of(dev, struct _feat_def, dev);    \
									       \
	return sprintf(buf, _format, _value);				       \
}									       \
static ZFCP_DEV_ATTR(_feat, _name, S_IRUGO,				       \
		     zfcp_sysfs_##_feat##_##_name##_show, NULL);

#define ZFCP_DEFINE_ATTR_CONST(_feat, _name, _format, _value)		       \
static ssize_t zfcp_sysfs_##_feat##_##_name##_show(struct device *dev,	       \
						   struct device_attribute *at,\
						   char *buf)		       \
{									       \
	return sprintf(buf, _format, _value);				       \
}									       \
static ZFCP_DEV_ATTR(_feat, _name, S_IRUGO,				       \
		     zfcp_sysfs_##_feat##_##_name##_show, NULL);

#define ZFCP_DEFINE_A_ATTR(_name, _format, _value)			     \
static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev,	     \
						 struct device_attribute *at,\
						 char *buf)		     \
{									     \
	struct ccw_device *cdev = to_ccwdev(dev);			     \
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);	     \
	int i;								     \
									     \
	if (!adapter)							     \
		return -ENODEV;						     \
									     \
	i = sprintf(buf, _format, _value);				     \
	zfcp_ccw_adapter_put(adapter);					     \
	return i;							     \
}									     \
static ZFCP_DEV_ATTR(adapter, _name, S_IRUGO,				     \
		     zfcp_sysfs_adapter_##_name##_show, NULL);

ZFCP_DEFINE_A_ATTR(status, "0x%08x\n", atomic_read(&adapter->status));
ZFCP_DEFINE_A_ATTR(peer_wwnn, "0x%016llx\n",
		   (unsigned long long) adapter->peer_wwnn);
ZFCP_DEFINE_A_ATTR(peer_wwpn, "0x%016llx\n",
		   (unsigned long long) adapter->peer_wwpn);
ZFCP_DEFINE_A_ATTR(peer_d_id, "0x%06x\n", adapter->peer_d_id);
ZFCP_DEFINE_A_ATTR(card_version, "0x%04x\n", adapter->hydra_version);
ZFCP_DEFINE_A_ATTR(lic_version, "0x%08x\n", adapter->fsf_lic_version);
ZFCP_DEFINE_A_ATTR(hardware_version, "0x%08x\n", adapter->hardware_version);
ZFCP_DEFINE_A_ATTR(in_recovery, "%d\n", (atomic_read(&adapter->status) &
					 ZFCP_STATUS_COMMON_ERP_INUSE) != 0);

ZFCP_DEFINE_ATTR(zfcp_port, port, status, "0x%08x\n",
		 atomic_read(&port->status));
ZFCP_DEFINE_ATTR(zfcp_port, port, in_recovery, "%d\n",
		 (atomic_read(&port->status) &
		  ZFCP_STATUS_COMMON_ERP_INUSE) != 0);
ZFCP_DEFINE_ATTR_CONST(port, access_denied, "%d\n", 0);

ZFCP_DEFINE_ATTR(zfcp_unit, unit, status, "0x%08x\n",
		 zfcp_unit_sdev_status(unit));
ZFCP_DEFINE_ATTR(zfcp_unit, unit, in_recovery, "%d\n",
		 (zfcp_unit_sdev_status(unit) &
		  ZFCP_STATUS_COMMON_ERP_INUSE) != 0);
ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_denied, "%d\n",
		 (zfcp_unit_sdev_status(unit) &
		  ZFCP_STATUS_COMMON_ACCESS_DENIED) != 0);
ZFCP_DEFINE_ATTR_CONST(unit, access_shared, "%d\n", 0);
ZFCP_DEFINE_ATTR_CONST(unit, access_readonly, "%d\n", 0);

static ssize_t zfcp_sysfs_port_failed_show(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);

	if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
		return sprintf(buf, "1\n");

	return sprintf(buf, "0\n");
}

static ssize_t zfcp_sysfs_port_failed_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
	unsigned long val;

	if (kstrtoul(buf, 0, &val) || val != 0)
		return -EINVAL;

	zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_RUNNING);
	zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, "sypfai2");
	zfcp_erp_wait(port->adapter);

	return count;
}
static ZFCP_DEV_ATTR(port, failed, S_IWUSR | S_IRUGO,
		     zfcp_sysfs_port_failed_show,
		     zfcp_sysfs_port_failed_store);

static ssize_t zfcp_sysfs_unit_failed_show(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev);
	struct scsi_device *sdev;
	unsigned int status, failed = 1;

	sdev = zfcp_unit_sdev(unit);
	if (sdev) {
		status = atomic_read(&sdev_to_zfcp(sdev)->status);
		failed = status & ZFCP_STATUS_COMMON_ERP_FAILED ? 1 : 0;
		scsi_device_put(sdev);
	}

	return sprintf(buf, "%d\n", failed);
}

static ssize_t zfcp_sysfs_unit_failed_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev);
	unsigned long val;
	struct scsi_device *sdev;

	if (kstrtoul(buf, 0, &val) || val != 0)
		return -EINVAL;

	sdev = zfcp_unit_sdev(unit);
	if (sdev) {
		zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
		zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED,
				    "syufai2");
		zfcp_erp_wait(unit->port->adapter);
	} else
		zfcp_unit_scsi_scan(unit);

	return count;
}
static ZFCP_DEV_ATTR(unit, failed, S_IWUSR | S_IRUGO,
		     zfcp_sysfs_unit_failed_show,
		     zfcp_sysfs_unit_failed_store);

static ssize_t zfcp_sysfs_adapter_failed_show(struct device *dev,
					      struct device_attribute *attr,
					      char *buf)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
	int i;

	if (!adapter)
		return -ENODEV;

	if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
		i = sprintf(buf, "1\n");
	else
		i = sprintf(buf, "0\n");

	zfcp_ccw_adapter_put(adapter);
	return i;
}

static ssize_t zfcp_sysfs_adapter_failed_store(struct device *dev,
					       struct device_attribute *attr,
					       const char *buf, size_t count)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
	unsigned long val;
	int retval = 0;

	if (!adapter)
		return -ENODEV;

	if (kstrtoul(buf, 0, &val) || val != 0) {
		retval = -EINVAL;
		goto out;
	}

	zfcp_erp_adapter_reset_sync(adapter, "syafai2");
out:
	zfcp_ccw_adapter_put(adapter);
	return retval ? retval : (ssize_t) count;
}
static ZFCP_DEV_ATTR(adapter, failed, S_IWUSR | S_IRUGO,
		     zfcp_sysfs_adapter_failed_show,
		     zfcp_sysfs_adapter_failed_store);

static ssize_t zfcp_sysfs_port_rescan_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);

	if (!adapter)
		return -ENODEV;

	/*
	 * Users wish is our command: immediately schedule and flush a
	 * worker to conduct a synchronous port scan, that is, neither
	 * a random delay nor a rate limit is applied here.
	 */
	queue_delayed_work(adapter->work_queue, &adapter->scan_work, 0);
	flush_delayed_work(&adapter->scan_work);
	zfcp_ccw_adapter_put(adapter);

	return (ssize_t) count;
}
static ZFCP_DEV_ATTR(adapter, port_rescan, S_IWUSR, NULL,
		     zfcp_sysfs_port_rescan_store);

DEFINE_MUTEX(zfcp_sysfs_port_units_mutex);

static void zfcp_sysfs_port_set_removing(struct zfcp_port *const port)
{
	lockdep_assert_held(&zfcp_sysfs_port_units_mutex);
	atomic_set(&port->units, -1);
}

bool zfcp_sysfs_port_is_removing(const struct zfcp_port *const port)
{
	lockdep_assert_held(&zfcp_sysfs_port_units_mutex);
	return atomic_read(&port->units) == -1;
}

static bool zfcp_sysfs_port_in_use(struct zfcp_port *const port)
{
	struct zfcp_adapter *const adapter = port->adapter;
	unsigned long flags;
	struct scsi_device *sdev;
	bool in_use = true;

	mutex_lock(&zfcp_sysfs_port_units_mutex);
	if (atomic_read(&port->units) > 0)
		goto unlock_port_units_mutex; /* zfcp_unit(s) under port */

	spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
	__shost_for_each_device(sdev, adapter->scsi_host) {
		const struct zfcp_scsi_dev *zsdev = sdev_to_zfcp(sdev);

		if (sdev->sdev_state == SDEV_DEL ||
		    sdev->sdev_state == SDEV_CANCEL)
			continue;
		if (zsdev->port != port)
			continue;
		/* alive scsi_device under port of interest */
		goto unlock_host_lock;
	}

	/* port is about to be removed, so no more unit_add or slave_alloc */
	zfcp_sysfs_port_set_removing(port);
	in_use = false;

unlock_host_lock:
	spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
unlock_port_units_mutex:
	mutex_unlock(&zfcp_sysfs_port_units_mutex);
	return in_use;
}

static ssize_t zfcp_sysfs_port_remove_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
	struct zfcp_port *port;
	u64 wwpn;
	int retval = -EINVAL;

	if (!adapter)
		return -ENODEV;

	if (kstrtoull(buf, 0, (unsigned long long *) &wwpn))
		goto out;

	port = zfcp_get_port_by_wwpn(adapter, wwpn);
	if (!port)
		goto out;
	else
		retval = 0;

	if (zfcp_sysfs_port_in_use(port)) {
		retval = -EBUSY;
		put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
		goto out;
	}

	write_lock_irq(&adapter->port_list_lock);
	list_del(&port->list);
	write_unlock_irq(&adapter->port_list_lock);

	put_device(&port->dev);

	zfcp_erp_port_shutdown(port, 0, "syprs_1");
	device_unregister(&port->dev);
 out:
	zfcp_ccw_adapter_put(adapter);
	return retval ? retval : (ssize_t) count;
}
static ZFCP_DEV_ATTR(adapter, port_remove, S_IWUSR, NULL,
		     zfcp_sysfs_port_remove_store);

static ssize_t
zfcp_sysfs_adapter_diag_max_age_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(to_ccwdev(dev));
	ssize_t rc;

	if (!adapter)
		return -ENODEV;

	/* ceil(log(2^64 - 1) / log(10)) = 20 */
	rc = scnprintf(buf, 20 + 2, "%lu\n", adapter->diagnostics->max_age);

	zfcp_ccw_adapter_put(adapter);
	return rc;
}

static ssize_t
zfcp_sysfs_adapter_diag_max_age_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(to_ccwdev(dev));
	unsigned long max_age;
	ssize_t rc;

	if (!adapter)
		return -ENODEV;

	rc = kstrtoul(buf, 10, &max_age);
	if (rc != 0)
		goto out;

	adapter->diagnostics->max_age = max_age;

	rc = count;
out:
	zfcp_ccw_adapter_put(adapter);
	return rc;
}
static ZFCP_DEV_ATTR(adapter, diag_max_age, 0644,
		     zfcp_sysfs_adapter_diag_max_age_show,
		     zfcp_sysfs_adapter_diag_max_age_store);

static struct attribute *zfcp_adapter_attrs[] = {
	&dev_attr_adapter_failed.attr,
	&dev_attr_adapter_in_recovery.attr,
	&dev_attr_adapter_port_remove.attr,
	&dev_attr_adapter_port_rescan.attr,
	&dev_attr_adapter_peer_wwnn.attr,
	&dev_attr_adapter_peer_wwpn.attr,
	&dev_attr_adapter_peer_d_id.attr,
	&dev_attr_adapter_card_version.attr,
	&dev_attr_adapter_lic_version.attr,
	&dev_attr_adapter_status.attr,
	&dev_attr_adapter_hardware_version.attr,
	&dev_attr_adapter_diag_max_age.attr,
	NULL
};

struct attribute_group zfcp_sysfs_adapter_attrs = {
	.attrs = zfcp_adapter_attrs,
};

static ssize_t zfcp_sysfs_unit_add_store(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count)
{
	struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
	u64 fcp_lun;
	int retval;

	if (kstrtoull(buf, 0, (unsigned long long *) &fcp_lun))
		return -EINVAL;

	retval = zfcp_unit_add(port, fcp_lun);
	if (retval)
		return retval;

	return count;
}
static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);

static ssize_t zfcp_sysfs_unit_remove_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
	u64 fcp_lun;

	if (kstrtoull(buf, 0, (unsigned long long *) &fcp_lun))
		return -EINVAL;

	if (zfcp_unit_remove(port, fcp_lun))
		return -EINVAL;

	return count;
}
static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);

static struct attribute *zfcp_port_attrs[] = {
	&dev_attr_unit_add.attr,
	&dev_attr_unit_remove.attr,
	&dev_attr_port_failed.attr,
	&dev_attr_port_in_recovery.attr,
	&dev_attr_port_status.attr,
	&dev_attr_port_access_denied.attr,
	NULL
};
static struct attribute_group zfcp_port_attr_group = {
	.attrs = zfcp_port_attrs,
};
const struct attribute_group *zfcp_port_attr_groups[] = {
	&zfcp_port_attr_group,
	NULL,
};

static struct attribute *zfcp_unit_attrs[] = {
	&dev_attr_unit_failed.attr,
	&dev_attr_unit_in_recovery.attr,
	&dev_attr_unit_status.attr,
	&dev_attr_unit_access_denied.attr,
	&dev_attr_unit_access_shared.attr,
	&dev_attr_unit_access_readonly.attr,
	NULL
};
static struct attribute_group zfcp_unit_attr_group = {
	.attrs = zfcp_unit_attrs,
};
const struct attribute_group *zfcp_unit_attr_groups[] = {
	&zfcp_unit_attr_group,
	NULL,
};

#define ZFCP_DEFINE_LATENCY_ATTR(_name) 				\
static ssize_t								\
zfcp_sysfs_unit_##_name##_latency_show(struct device *dev,		\
				       struct device_attribute *attr,	\
				       char *buf) {			\
	struct scsi_device *sdev = to_scsi_device(dev);			\
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);		\
	struct zfcp_latencies *lat = &zfcp_sdev->latencies;		\
	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;	\
	unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc;	\
									\
	spin_lock_bh(&lat->lock);					\
	fsum = lat->_name.fabric.sum * adapter->timer_ticks;		\
	fmin = lat->_name.fabric.min * adapter->timer_ticks;		\
	fmax = lat->_name.fabric.max * adapter->timer_ticks;		\
	csum = lat->_name.channel.sum * adapter->timer_ticks;		\
	cmin = lat->_name.channel.min * adapter->timer_ticks;		\
	cmax = lat->_name.channel.max * adapter->timer_ticks;		\
	cc  = lat->_name.counter;					\
	spin_unlock_bh(&lat->lock);					\
									\
	do_div(fsum, 1000);						\
	do_div(fmin, 1000);						\
	do_div(fmax, 1000);						\
	do_div(csum, 1000);						\
	do_div(cmin, 1000);						\
	do_div(cmax, 1000);						\
									\
	return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n",	\
		       fmin, fmax, fsum, cmin, cmax, csum, cc); 	\
}									\
static ssize_t								\
zfcp_sysfs_unit_##_name##_latency_store(struct device *dev,		\
					struct device_attribute *attr,	\
					const char *buf, size_t count)	\
{									\
	struct scsi_device *sdev = to_scsi_device(dev);			\
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);		\
	struct zfcp_latencies *lat = &zfcp_sdev->latencies;		\
	unsigned long flags;						\
									\
	spin_lock_irqsave(&lat->lock, flags);				\
	lat->_name.fabric.sum = 0;					\
	lat->_name.fabric.min = 0xFFFFFFFF;				\
	lat->_name.fabric.max = 0;					\
	lat->_name.channel.sum = 0;					\
	lat->_name.channel.min = 0xFFFFFFFF;				\
	lat->_name.channel.max = 0;					\
	lat->_name.counter = 0;						\
	spin_unlock_irqrestore(&lat->lock, flags);			\
									\
	return (ssize_t) count;						\
}									\
static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO,			\
		   zfcp_sysfs_unit_##_name##_latency_show,		\
		   zfcp_sysfs_unit_##_name##_latency_store);

ZFCP_DEFINE_LATENCY_ATTR(read);
ZFCP_DEFINE_LATENCY_ATTR(write);
ZFCP_DEFINE_LATENCY_ATTR(cmd);

#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)			\
static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev,	\
					      struct device_attribute *attr,\
					      char *buf)                 \
{                                                                        \
	struct scsi_device *sdev = to_scsi_device(dev);			 \
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);		 \
									 \
	return sprintf(buf, _format, _value);                            \
}                                                                        \
static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);

ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n",
		      dev_name(&zfcp_sdev->port->adapter->ccw_device->dev));
ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n",
		      (unsigned long long) zfcp_sdev->port->wwpn);

static ssize_t zfcp_sysfs_scsi_fcp_lun_show(struct device *dev,
					    struct device_attribute *attr,
					    char *buf)
{
	struct scsi_device *sdev = to_scsi_device(dev);

	return sprintf(buf, "0x%016llx\n", zfcp_scsi_dev_lun(sdev));
}
static DEVICE_ATTR(fcp_lun, S_IRUGO, zfcp_sysfs_scsi_fcp_lun_show, NULL);

ZFCP_DEFINE_SCSI_ATTR(zfcp_access_denied, "%d\n",
		      (atomic_read(&zfcp_sdev->status) &
		       ZFCP_STATUS_COMMON_ACCESS_DENIED) != 0);

static ssize_t zfcp_sysfs_scsi_zfcp_failed_show(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct scsi_device *sdev = to_scsi_device(dev);
	unsigned int status = atomic_read(&sdev_to_zfcp(sdev)->status);
	unsigned int failed = status & ZFCP_STATUS_COMMON_ERP_FAILED ? 1 : 0;

	return sprintf(buf, "%d\n", failed);
}

static ssize_t zfcp_sysfs_scsi_zfcp_failed_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct scsi_device *sdev = to_scsi_device(dev);
	unsigned long val;

	if (kstrtoul(buf, 0, &val) || val != 0)
		return -EINVAL;

	zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
	zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED,
			    "syufai3");
	zfcp_erp_wait(sdev_to_zfcp(sdev)->port->adapter);

	return count;
}
static DEVICE_ATTR(zfcp_failed, S_IWUSR | S_IRUGO,
		   zfcp_sysfs_scsi_zfcp_failed_show,
		   zfcp_sysfs_scsi_zfcp_failed_store);

ZFCP_DEFINE_SCSI_ATTR(zfcp_in_recovery, "%d\n",
		      (atomic_read(&zfcp_sdev->status) &
		       ZFCP_STATUS_COMMON_ERP_INUSE) != 0);

ZFCP_DEFINE_SCSI_ATTR(zfcp_status, "0x%08x\n",
		      atomic_read(&zfcp_sdev->status));

struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
	&dev_attr_fcp_lun,
	&dev_attr_wwpn,
	&dev_attr_hba_id,
	&dev_attr_read_latency,
	&dev_attr_write_latency,
	&dev_attr_cmd_latency,
	&dev_attr_zfcp_access_denied,
	&dev_attr_zfcp_failed,
	&dev_attr_zfcp_in_recovery,
	&dev_attr_zfcp_status,
	NULL
};

static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
					    struct device_attribute *attr,
					    char *buf)
{
	struct Scsi_Host *scsi_host = dev_to_shost(dev);
	struct fsf_qtcb_bottom_port *qtcb_port;
	struct zfcp_adapter *adapter;
	int retval;

	adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
	if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
		return -EOPNOTSUPP;

	qtcb_port = kzalloc(sizeof(struct fsf_qtcb_bottom_port), GFP_KERNEL);
	if (!qtcb_port)
		return -ENOMEM;

	retval = zfcp_fsf_exchange_port_data_sync(adapter->qdio, qtcb_port);
	if (retval == 0 || retval == -EAGAIN)
		retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
				 qtcb_port->cb_util, qtcb_port->a_util);
	kfree(qtcb_port);
	return retval;
}
static DEVICE_ATTR(utilization, S_IRUGO, zfcp_sysfs_adapter_util_show, NULL);

static int zfcp_sysfs_adapter_ex_config(struct device *dev,
					struct fsf_statistics_info *stat_inf)
{
	struct Scsi_Host *scsi_host = dev_to_shost(dev);
	struct fsf_qtcb_bottom_config *qtcb_config;
	struct zfcp_adapter *adapter;
	int retval;

	adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
	if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
		return -EOPNOTSUPP;

	qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config),
			      GFP_KERNEL);
	if (!qtcb_config)
		return -ENOMEM;

	retval = zfcp_fsf_exchange_config_data_sync(adapter->qdio, qtcb_config);
	if (retval == 0 || retval == -EAGAIN)
		*stat_inf = qtcb_config->stat_info;

	kfree(qtcb_config);
	return retval;
}

#define ZFCP_SHOST_ATTR(_name, _format, _arg...)			\
static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev,	\
						 struct device_attribute *attr,\
						 char *buf)		\
{									\
	struct fsf_statistics_info stat_info;				\
	int retval;							\
									\
	retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);		\
	if (retval)							\
		return retval;						\
									\
	return sprintf(buf, _format, ## _arg);				\
}									\
static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_adapter_##_name##_show, NULL);

ZFCP_SHOST_ATTR(requests, "%llu %llu %llu\n",
		(unsigned long long) stat_info.input_req,
		(unsigned long long) stat_info.output_req,
		(unsigned long long) stat_info.control_req);

ZFCP_SHOST_ATTR(megabytes, "%llu %llu\n",
		(unsigned long long) stat_info.input_mb,
		(unsigned long long) stat_info.output_mb);

ZFCP_SHOST_ATTR(seconds_active, "%llu\n",
		(unsigned long long) stat_info.seconds_act);

static ssize_t zfcp_sysfs_adapter_q_full_show(struct device *dev,
					      struct device_attribute *attr,
					      char *buf)
{
	struct Scsi_Host *scsi_host = class_to_shost(dev);
	struct zfcp_qdio *qdio =
		((struct zfcp_adapter *) scsi_host->hostdata[0])->qdio;
	u64 util;

	spin_lock_bh(&qdio->stat_lock);
	util = qdio->req_q_util;
	spin_unlock_bh(&qdio->stat_lock);

	return sprintf(buf, "%d %llu\n", atomic_read(&qdio->req_q_full),
		       (unsigned long long)util);
}
static DEVICE_ATTR(queue_full, S_IRUGO, zfcp_sysfs_adapter_q_full_show, NULL);

struct device_attribute *zfcp_sysfs_shost_attrs[] = {
	&dev_attr_utilization,
	&dev_attr_requests,
	&dev_attr_megabytes,
	&dev_attr_seconds_active,
	&dev_attr_queue_full,
	NULL
};

static ssize_t zfcp_sysfs_adapter_diag_b2b_credit_show(
	struct device *dev, struct device_attribute *attr, char *buf)
{
	struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(to_ccwdev(dev));
	struct zfcp_diag_header *diag_hdr;
	struct fc_els_flogi *nsp;
	ssize_t rc = -ENOLINK;
	unsigned long flags;
	unsigned int status;

	if (!adapter)
		return -ENODEV;

	status = atomic_read(&adapter->status);
	if (0 == (status & ZFCP_STATUS_COMMON_OPEN) ||
	    0 == (status & ZFCP_STATUS_COMMON_UNBLOCKED) ||
	    0 != (status & ZFCP_STATUS_COMMON_ERP_FAILED))
		goto out;

	diag_hdr = &adapter->diagnostics->config_data.header;

	rc = zfcp_diag_update_buffer_limited(
		adapter, diag_hdr, zfcp_diag_update_config_data_buffer);
	if (rc != 0)
		goto out;

	spin_lock_irqsave(&diag_hdr->access_lock, flags);
	/* nport_serv_param doesn't contain the ELS_Command code */
	nsp = (struct fc_els_flogi *)((unsigned long)
					      adapter->diagnostics->config_data
						      .data.nport_serv_param -
				      sizeof(u32));

	rc = scnprintf(buf, 5 + 2, "%hu\n",
		       be16_to_cpu(nsp->fl_csp.sp_bb_cred));
	spin_unlock_irqrestore(&diag_hdr->access_lock, flags);

out:
	zfcp_ccw_adapter_put(adapter);
	return rc;
}
static ZFCP_DEV_ATTR(adapter_diag, b2b_credit, 0400,
		     zfcp_sysfs_adapter_diag_b2b_credit_show, NULL);

#define ZFCP_DEFINE_DIAG_SFP_ATTR(_name, _qtcb_member, _prtsize, _prtfmt)      \
	static ssize_t zfcp_sysfs_adapter_diag_sfp_##_name##_show(	       \
		struct device *dev, struct device_attribute *attr, char *buf)  \
	{								       \
		struct zfcp_adapter *const adapter =			       \
			zfcp_ccw_adapter_by_cdev(to_ccwdev(dev));	       \
		struct zfcp_diag_header *diag_hdr;			       \
		ssize_t rc = -ENOLINK;					       \
		unsigned long flags;					       \
		unsigned int status;					       \
									       \
		if (!adapter)						       \
			return -ENODEV;					       \
									       \
		status = atomic_read(&adapter->status);			       \
		if (0 == (status & ZFCP_STATUS_COMMON_OPEN) ||		       \
		    0 == (status & ZFCP_STATUS_COMMON_UNBLOCKED) ||	       \
		    0 != (status & ZFCP_STATUS_COMMON_ERP_FAILED))	       \
			goto out;					       \
									       \
		if (!zfcp_diag_support_sfp(adapter)) {			       \
			rc = -EOPNOTSUPP;				       \
			goto out;					       \
		}							       \
									       \
		diag_hdr = &adapter->diagnostics->port_data.header;	       \
									       \
		rc = zfcp_diag_update_buffer_limited(			       \
			adapter, diag_hdr, zfcp_diag_update_port_data_buffer); \
		if (rc != 0)						       \
			goto out;					       \
									       \
		spin_lock_irqsave(&diag_hdr->access_lock, flags);	       \
		rc = scnprintf(						       \
			buf, (_prtsize) + 2, _prtfmt "\n",		       \
			adapter->diagnostics->port_data.data._qtcb_member);    \
		spin_unlock_irqrestore(&diag_hdr->access_lock, flags);	       \
									       \
	out:								       \
		zfcp_ccw_adapter_put(adapter);				       \
		return rc;						       \
	}								       \
	static ZFCP_DEV_ATTR(adapter_diag_sfp, _name, 0400,		       \
			     zfcp_sysfs_adapter_diag_sfp_##_name##_show, NULL)

ZFCP_DEFINE_DIAG_SFP_ATTR(temperature, temperature, 5, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(vcc, vcc, 5, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(tx_bias, tx_bias, 5, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(tx_power, tx_power, 5, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(rx_power, rx_power, 5, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(port_tx_type, sfp_flags.port_tx_type, 2, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(optical_port, sfp_flags.optical_port, 1, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(sfp_invalid, sfp_flags.sfp_invalid, 1, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(connector_type, sfp_flags.connector_type, 1, "%hu");
ZFCP_DEFINE_DIAG_SFP_ATTR(fec_active, sfp_flags.fec_active, 1, "%hu");

static struct attribute *zfcp_sysfs_diag_attrs[] = {
	&dev_attr_adapter_diag_sfp_temperature.attr,
	&dev_attr_adapter_diag_sfp_vcc.attr,
	&dev_attr_adapter_diag_sfp_tx_bias.attr,
	&dev_attr_adapter_diag_sfp_tx_power.attr,
	&dev_attr_adapter_diag_sfp_rx_power.attr,
	&dev_attr_adapter_diag_sfp_port_tx_type.attr,
	&dev_attr_adapter_diag_sfp_optical_port.attr,
	&dev_attr_adapter_diag_sfp_sfp_invalid.attr,
	&dev_attr_adapter_diag_sfp_connector_type.attr,
	&dev_attr_adapter_diag_sfp_fec_active.attr,
	&dev_attr_adapter_diag_b2b_credit.attr,
	NULL,
};

const struct attribute_group zfcp_sysfs_diag_attr_group = {
	.name = "diagnostics",
	.attrs = zfcp_sysfs_diag_attrs,
};