xenbusb_back.c File Reference

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <sys/sx.h>
#include <sys/taskqueue.h>
#include <machine/stdarg.h>
#include <xen/xen-os.h>
#include <xen/gnttab.h>
#include <xen/xenbus/xenbusvar.h>
#include <xen/xenbus/xenbusb.h>

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Functions
	__FBSDID ("$FreeBSD$")
static int	xenbusb_back_probe (device_t dev)
	Probe for the existence of the XenBus back bus. More...
static int	xenbusb_back_attach (device_t dev)
	Attach the XenBus back bus. More...
static int	xenbusb_back_enumerate_type (device_t dev, const char *type)
	Enumerate all devices of the given type on this bus. More...
static int	xenbusb_back_get_otherend_node (device_t dev, struct xenbus_device_ivars *ivars)
	Determine and store the XenStore path for the other end of a split device whose local end is represented by ivars. More...
static void	xenbusb_back_otherend_changed (device_t bus, device_t child, enum xenbus_state peer_state)
	Backend XenBus method implementing responses to peer state changes. More...
static void	xenbusb_back_localend_changed (device_t bus, device_t child, const char *path)
	Backend XenBus method implementing responses to local XenStore changes. More...
	DEFINE_CLASS_0 (xenbusb_back, xenbusb_back_driver, xenbusb_back_methods, sizeof(struct xenbusb_softc))
	DRIVER_MODULE (xenbusb_back, xenstore, xenbusb_back_driver, xenbusb_back_devclass, 0, 0)

Variables
static device_method_t	xenbusb_back_methods []
devclass_t	xenbusb_back_devclass

Detailed Description

XenBus management of the NewBus bus containing the backend instances of Xen split devices.

Definition in file xenbusb_back.c.

Function Documentation

xenbusb_back_attach()

static int xenbusb_back_attach ( device_t  dev )

static

Attach the XenBus back bus.

Parameters

dev	NewBus device_t for this XenBus back bus instance.

Returns

On success, 0. Otherwise an errno value indicating the type of failure.

Definition at line 86 of file xenbusb_back.c.

References xenbusb_softc::xbs_flags, xenbusb_softc::xbs_lock, and xenbusb_attach().

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xenbusb_back_enumerate_type()

static int xenbusb_back_enumerate_type ( device_t  dev, const char *  type  )

static

Enumerate all devices of the given type on this bus.

Parameters

dev	NewBus device_t for this XenBus backend bus instance.
type	String indicating the device sub-tree (e.g. "vfb", "vif") to enumerate.

Returns

On success, 0. Otherwise an errno value indicating the type of failure.

Devices that are found are 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.

The backend XenStore hierarchy has the following format:

backend/<device type>/<frontend vm id>/<device id>

Definition at line 132 of file xenbusb_back.c.

References xenbusb_softc::xbs_node, and xenbusb_add_device().

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xenbusb_back_get_otherend_node()

static int xenbusb_back_get_otherend_node ( device_t  dev, struct xenbus_device_ivars *  ivars  )

static

Determine and store the XenStore path for the other end of a split device whose local end is represented by ivars.

Parameters

dev	NewBus device_t for this XenBus backend bus instance.
ivars	Instance variables from the XenBus child device for which to perform this function.

Returns

On success, 0. Otherwise an errno value indicating the type of failure.

If successful, the xd_otherend_path field of the child's instance variables will be updated.

Definition at line 193 of file xenbusb_back.c.

References xenbus_device_ivars::xd_node, xenbus_device_ivars::xd_otherend_id, xenbus_device_ivars::xd_otherend_path, and xenbus_device_ivars::xd_otherend_path_len.

xenbusb_back_localend_changed()

static void xenbusb_back_localend_changed ( device_t  bus, device_t  child, const char *  path  )

static

Backend XenBus method implementing responses to local XenStore changes.

Parameters

bus	The XenBus bus parent of child.
child	The XenBus child whose peer stat has changed. \param_path The tree relative sub-path to the modified node. The empty string indicates the root of the tree was destroyed.

Definition at line 254 of file xenbusb_back.c.

References xenbus_dev_is_online(), and xenbusb_localend_changed().

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xenbusb_back_otherend_changed()

static void xenbusb_back_otherend_changed ( device_t  bus, device_t  child, enum xenbus_state  peer_state  )

static

Backend XenBus method implementing responses to peer state changes.

Parameters

bus	The XenBus bus parent of child.
child	The XenBus child whose peer stat has changed.
state	The current state of the peer.

Definition at line 224 of file xenbusb_back.c.

References xenbus_dev_is_online(), and xenbusb_otherend_changed().

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xenbusb_back_probe()

static int xenbusb_back_probe ( device_t  dev )

static

Probe for the existence of the XenBus back bus.

Parameters

dev	NewBus device_t for this XenBus back bus instance.

Returns

Always returns 0 indicating success.

Definition at line 70 of file xenbusb_back.c.

Variable Documentation

xenbusb_back_devclass

devclass_t xenbusb_back_devclass

Definition at line 315 of file xenbusb_back.c.

xenbusb_back_methods

device_method_t xenbusb_back_methods[]

static

Initial value:

= { 
         
        DEVMETHOD(device_identify,      xenbusb_identify),
        DEVMETHOD(device_probe,         xenbusb_back_probe), 
        DEVMETHOD(device_attach,        xenbusb_back_attach), 
        DEVMETHOD(device_detach,        bus_generic_detach), 
        DEVMETHOD(device_shutdown,      bus_generic_shutdown), 
        DEVMETHOD(device_suspend,       bus_generic_suspend), 
        DEVMETHOD(device_resume,        xenbusb_resume), 
 
         
        DEVMETHOD(bus_print_child,      xenbusb_print_child),
        DEVMETHOD(bus_read_ivar,        xenbusb_read_ivar), 
        DEVMETHOD(bus_write_ivar,       xenbusb_write_ivar), 
        DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
        DEVMETHOD(bus_release_resource, bus_generic_release_resource),
        DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
        DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
 
        
        DEVMETHOD(xenbusb_enumerate_type, xenbusb_back_enumerate_type),
        DEVMETHOD(xenbusb_get_otherend_node, xenbusb_back_get_otherend_node),
        DEVMETHOD(xenbusb_otherend_changed, xenbusb_back_otherend_changed),
        DEVMETHOD(xenbusb_localend_changed, xenbusb_back_localend_changed),
        { 0, 0 } 
}

Definition at line 286 of file xenbusb_back.c.