text: /*
   * zfcp device driver
   *
   * sysfs attributes.
   *
   * Copyright IBM Corporation 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_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(zfcp_port, port, access_denied, "%d\n",
  		 (atomic_read(&port->status) &
  		  ZFCP_STATUS_COMMON_ACCESS_DENIED) != 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(zfcp_unit, unit, access_shared, "%d\n",
  		 (zfcp_unit_sdev_status(unit) &
  		  ZFCP_STATUS_LUN_SHARED) != 0);
  ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_readonly, "%d\n",
  		 (zfcp_unit_sdev_status(unit) &
  		  ZFCP_STATUS_LUN_READONLY) != 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 (strict_strtoul(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 (strict_strtoul(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 (strict_strtoul(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);
  
  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 (strict_strtoull(buf, 0, (unsigned long long *) &wwpn))
  		goto out;
  
  	port = zfcp_get_port_by_wwpn(adapter, wwpn);
  	if (!port)
  		goto out;
  	else
  		retval = 0;
  
  	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");
  	zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs);
   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;
  
  	if (strict_strtoull(buf, 0, (unsigned long long *) &fcp_lun))
  		return -EINVAL;
  
  	if (zfcp_unit_add(port, fcp_lun))
  		return -EINVAL;
  
  	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 (strict_strtoull(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
  };
  
  /**
   * zfcp_sysfs_port_attrs - sysfs attributes for all other ports
   */
  struct attribute_group zfcp_sysfs_port_attrs = {
  	.attrs = zfcp_port_attrs,
  };
  
  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
  };
  
  struct attribute_group zfcp_sysfs_unit_attrs = {
  	.attrs = zfcp_unit_attrs,
  };
  
  #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
  };
  