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# Copyright (c) 2010 Spectra Logic Corporation
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# $FreeBSD$
#

#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/sx.h>
#include <sys/taskqueue.h>

#include <xen/xenstore/xenstorevar.h>
#include <xen/xenbus/xenbusb.h>

INTERFACE xenbusb;

/**
 * \brief Enumerate all devices of the given type on this bus.
 *
 * \param _dev  NewBus device_t for this XenBus (front/back) bus instance.
 * \param _type String indicating the device sub-tree (e.g. "vfb", "vif")
 *              to enumerate. 
 *
 * \return  On success, 0. Otherwise an errno value indicating the
 *          type of failure.
 *
 * Devices that are found should be entered into the NewBus hierarchy via
 * xenbusb_add_device().  xenbusb_add_device() ignores duplicate detects
 * and ignores duplicate devices, so it can be called unconditionally
 * for any device found in the XenStore.
 */
METHOD int enumerate_type {
	device_t _dev;
	const char *_type;
};

/**
 * \brief Determine and store the XenStore path for the other end of
 *        a split device whose local end is represented by ivars.
 *
 * If successful, the xd_otherend_path field of the child's instance
 * variables must be updated.
 *
 * \param _dev    NewBus device_t for this XenBus (front/back) bus instance.
 * \param _ivars  Instance variables from the XenBus child device for
 *                which to perform this function.
 *
 * \return  On success, 0. Otherwise an errno value indicating the
 *          type of failure.
 */
METHOD int get_otherend_node {
	device_t _dev;
	struct xenbus_device_ivars *_ivars;
}

/**
 * \brief Handle a XenStore change detected in the peer tree of a child
 *        device of the bus.
 *
 * \param _bus       NewBus device_t for this XenBus (front/back) bus instance.
 * \param _child     NewBus device_t for the child device whose peer XenStore
 *                   tree has changed.
 * \param _state     The current state of the peer.
 */
METHOD void otherend_changed {
	device_t _bus;
	device_t _child;
	enum xenbus_state _state;
} DEFAULT xenbusb_otherend_changed;

/**
 * \brief Handle a XenStore change detected in the local tree of a child
 *        device of the bus.
 *
 * \param _bus    NewBus device_t for this XenBus (front/back) bus instance.
 * \param _child  NewBus device_t for the child device whose peer XenStore
 *                tree has changed.
 * \param _path   The tree relative sub-path to the modified node.  The empty
 *                string indicates the root of the tree was destroyed.
 */
METHOD void localend_changed {
	device_t _bus;
	device_t _child;
	const char * _path;
} DEFAULT xenbusb_localend_changed;