xref: /linux/include/xen/interface/io/xenbus.h (revision 03ab8e6297acd1bc0eedaa050e2a1635c576fd11)
1 /* SPDX-License-Identifier: MIT */
2 /*****************************************************************************
3  * xenbus.h
4  *
5  * Xenbus protocol details.
6  *
7  * Copyright (C) 2005 XenSource Ltd.
8  */
9 
10 #ifndef _XEN_PUBLIC_IO_XENBUS_H
11 #define _XEN_PUBLIC_IO_XENBUS_H
12 
13 /* The state of either end of the Xenbus, i.e. the current communication
14    status of initialisation across the bus.  States here imply nothing about
15    the state of the connection between the driver and the kernel's device
16    layers.  */
17 enum xenbus_state
18 {
19 	XenbusStateUnknown      = 0,
20 	XenbusStateInitialising = 1,
21 	XenbusStateInitWait     = 2,  /* Finished early
22 					 initialisation, but waiting
23 					 for information from the peer
24 					 or hotplug scripts. */
25 	XenbusStateInitialised  = 3,  /* Initialised and waiting for a
26 					 connection from the peer. */
27 	XenbusStateConnected    = 4,
28 	XenbusStateClosing      = 5,  /* The device is being closed
29 					 due to an error or an unplug
30 					 event. */
31 	XenbusStateClosed       = 6,
32 
33 	/*
34 	* Reconfiguring: The device is being reconfigured.
35 	*/
36 	XenbusStateReconfiguring = 7,
37 
38 	XenbusStateReconfigured  = 8
39 };
40 
41 #endif /* _XEN_PUBLIC_IO_XENBUS_H */
42