freebsd-dev/sys/xen/xenbus/xenbusvar.h
Kip Macy 3a6d1fcf9c merge 186535, 186537, and 186538 from releng_7_xen
Log:
 - merge in latest xenbus from dfr's xenhvm
 - fix race condition in xs_read_reply by converting tsleep to mtx_sleep

Log:
 unmask evtchn in bind_{virq, ipi}_to_irq

Log:
 - remove code for handling case of not being able to sleep
 - eliminate tsleep - make sleeps atomic
2008-12-29 06:31:03 +00:00

260 lines
8.2 KiB
C

/******************************************************************************
* xenbus.h
*
* Talks to Xen Store to figure out what devices we have.
*
* Copyright (C) 2005 Rusty Russell, IBM Corporation
* Copyright (C) 2005 XenSource Ltd.
*
* This file may be distributed separately from the Linux kernel, or
* incorporated into other software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* $FreeBSD$
*/
#ifndef _XEN_XENBUS_XENBUSVAR_H
#define _XEN_XENBUS_XENBUSVAR_H
#include <sys/queue.h>
#include <sys/bus.h>
#include <sys/eventhandler.h>
#include <machine/xen/xen-os.h>
#include <xen/interface/io/xenbus.h>
#include <xen/interface/io/xs_wire.h>
#include "xenbus_if.h"
enum {
/*
* Path of this device node.
*/
XENBUS_IVAR_NODE,
/*
* The device type (e.g. vif, vbd).
*/
XENBUS_IVAR_TYPE,
/*
* The state of this device (not the otherend's state).
*/
XENBUS_IVAR_STATE,
/*
* Domain ID of the other end device.
*/
XENBUS_IVAR_OTHEREND_ID,
/*
* Path of the other end device.
*/
XENBUS_IVAR_OTHEREND_PATH
};
/*
* Simplified accessors for xenbus devices
*/
#define XENBUS_ACCESSOR(var, ivar, type) \
__BUS_ACCESSOR(xenbus, var, XENBUS, ivar, type)
XENBUS_ACCESSOR(node, NODE, const char *)
XENBUS_ACCESSOR(type, TYPE, const char *)
XENBUS_ACCESSOR(state, STATE, enum xenbus_state)
XENBUS_ACCESSOR(otherend_id, OTHEREND_ID, int)
XENBUS_ACCESSOR(otherend_path, OTHEREND_PATH, const char *)
/* Register callback to watch this node. */
struct xenbus_watch
{
LIST_ENTRY(xenbus_watch) list;
/* Path being watched. */
char *node;
/* Callback (executed in a process context with no locks held). */
void (*callback)(struct xenbus_watch *,
const char **vec, unsigned int len);
};
typedef int (*xenstore_event_handler_t)(void *);
struct xenbus_transaction
{
uint32_t id;
};
#define XBT_NIL ((struct xenbus_transaction) { 0 })
int xenbus_directory(struct xenbus_transaction t, const char *dir,
const char *node, unsigned int *num, char ***result);
int xenbus_read(struct xenbus_transaction t, const char *dir,
const char *node, unsigned int *len, void **result);
int xenbus_write(struct xenbus_transaction t, const char *dir,
const char *node, const char *string);
int xenbus_mkdir(struct xenbus_transaction t, const char *dir,
const char *node);
int xenbus_exists(struct xenbus_transaction t, const char *dir,
const char *node);
int xenbus_rm(struct xenbus_transaction t, const char *dir, const char *node);
int xenbus_transaction_start(struct xenbus_transaction *t);
int xenbus_transaction_end(struct xenbus_transaction t, int abort);
/*
* Single read and scanf: returns errno or zero. If scancountp is
* non-null, then number of items scanned is returned in *scanncountp.
*/
int xenbus_scanf(struct xenbus_transaction t,
const char *dir, const char *node, int *scancountp, const char *fmt, ...)
__attribute__((format(scanf, 5, 6)));
/* Single printf and write: returns errno or 0. */
int xenbus_printf(struct xenbus_transaction t,
const char *dir, const char *node, const char *fmt, ...)
__attribute__((format(printf, 4, 5)));
/*
* Generic read function: NULL-terminated triples of name,
* sprintf-style type string, and pointer. Returns 0 or errno.
*/
int xenbus_gather(struct xenbus_transaction t, const char *dir, ...);
/* notifer routines for when the xenstore comes up */
int register_xenstore_notifier(xenstore_event_handler_t func, void *arg, int priority);
#if 0
void unregister_xenstore_notifier();
#endif
int register_xenbus_watch(struct xenbus_watch *watch);
void unregister_xenbus_watch(struct xenbus_watch *watch);
void xs_suspend(void);
void xs_resume(void);
/* Used by xenbus_dev to borrow kernel's store connection. */
int xenbus_dev_request_and_reply(struct xsd_sockmsg *msg, void **result);
#if 0
#define XENBUS_IS_ERR_READ(str) ({ \
if (!IS_ERR(str) && strlen(str) == 0) { \
free(str, M_DEVBUF); \
str = ERR_PTR(-ERANGE); \
} \
IS_ERR(str); \
})
#endif
#define XENBUS_EXIST_ERR(err) ((err) == ENOENT || (err) == ERANGE)
/**
* Register a watch on the given path, using the given xenbus_watch structure
* for storage, and the given callback function as the callback. Return 0 on
* success, or errno on error. On success, the given path will be saved as
* watch->node, and remains the caller's to free. On error, watch->node will
* be NULL, the device will switch to XenbusStateClosing, and the error will
* be saved in the store.
*/
int xenbus_watch_path(device_t dev, char *path,
struct xenbus_watch *watch,
void (*callback)(struct xenbus_watch *,
const char **, unsigned int));
/**
* Register a watch on the given path/path2, using the given xenbus_watch
* structure for storage, and the given callback function as the callback.
* Return 0 on success, or errno on error. On success, the watched path
* (path/path2) will be saved as watch->node, and becomes the caller's to
* kfree(). On error, watch->node will be NULL, so the caller has nothing to
* free, the device will switch to XenbusStateClosing, and the error will be
* saved in the store.
*/
int xenbus_watch_path2(device_t dev, const char *path,
const char *path2, struct xenbus_watch *watch,
void (*callback)(struct xenbus_watch *,
const char **, unsigned int));
/**
* Advertise in the store a change of the given driver to the given new_state.
* which case this is performed inside its own transaction. Return 0 on
* success, or errno on error. On error, the device will switch to
* XenbusStateClosing, and the error will be saved in the store.
*/
int xenbus_switch_state(device_t dev,
XenbusState new_state);
/**
* Grant access to the given ring_mfn to the peer of the given device.
* Return 0 on success, or errno on error. On error, the device will
* switch to XenbusStateClosing, and the error will be saved in the
* store. The grant ring reference is returned in *refp.
*/
int xenbus_grant_ring(device_t dev, unsigned long ring_mfn, int *refp);
/**
* Allocate an event channel for the given xenbus_device, assigning the newly
* created local port to *port. Return 0 on success, or errno on error. On
* error, the device will switch to XenbusStateClosing, and the error will be
* saved in the store.
*/
int xenbus_alloc_evtchn(device_t dev, int *port);
/**
* Free an existing event channel. Returns 0 on success or errno on error.
*/
int xenbus_free_evtchn(device_t dev, int port);
/**
* Return the state of the driver rooted at the given store path, or
* XenbusStateClosed if no state can be read.
*/
XenbusState xenbus_read_driver_state(const char *path);
/***
* Report the given negative errno into the store, along with the given
* formatted message.
*/
void xenbus_dev_error(device_t dev, int err, const char *fmt,
...);
/***
* Equivalent to xenbus_dev_error(dev, err, fmt, args), followed by
* xenbus_switch_state(dev, NULL, XenbusStateClosing) to schedule an orderly
* closedown of this driver and its peer.
*/
void xenbus_dev_fatal(device_t dev, int err, const char *fmt,
...);
int xenbus_dev_init(void);
const char *xenbus_strstate(enum xenbus_state state);
int xenbus_dev_is_online(device_t dev);
int xenbus_frontend_closed(device_t dev);
#endif /* _XEN_XENBUS_XENBUSVAR_H */