/*
 * 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_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_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING);
	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
				"syafai2");
	zfcp_erp_wait(adapter);
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;

	/* sync the user-space- with the kernel-invocation of scan_work */
	queue_work(adapter->work_queue, &adapter->scan_work);
	flush_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 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;

	mutex_lock(&zfcp_sysfs_port_units_mutex);
	if (atomic_read(&port->units) > 0) {
		retval = -EBUSY;
		mutex_unlock(&zfcp_sysfs_port_units_mutex);
		goto out;
	}
	/* port is about to be removed, so no more unit_add */
	atomic_set(&port->units, -1);
	mutex_unlock(&zfcp_sysfs_port_units_mutex);

	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 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,
	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);		 \
	struct zfcp_port *port = zfcp_sdev->port;			 \
									 \
	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(&port->adapter->ccw_device->dev));
ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n",
		      (unsigned long long) 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);

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,
	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)
		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)
		*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
};