9198d09682
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
260 lines
8.2 KiB
C
260 lines
8.2 KiB
C
/******************************************************************************
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* xenbus.h
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*
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* Talks to Xen Store to figure out what devices we have.
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*
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* Copyright (C) 2005 Rusty Russell, IBM Corporation
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* Copyright (C) 2005 XenSource Ltd.
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*
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* This file may be distributed separately from the Linux kernel, or
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* incorporated into other software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* $FreeBSD$
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*/
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#ifndef _XEN_XENBUS_XENBUSVAR_H
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#define _XEN_XENBUS_XENBUSVAR_H
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#include <sys/queue.h>
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#include <sys/bus.h>
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#include <sys/eventhandler.h>
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#include <machine/xen/xen-os.h>
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#include <xen/interface/io/xenbus.h>
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#include <xen/interface/io/xs_wire.h>
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#include "xenbus_if.h"
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enum {
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/*
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* Path of this device node.
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*/
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XENBUS_IVAR_NODE,
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/*
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* The device type (e.g. vif, vbd).
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*/
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XENBUS_IVAR_TYPE,
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/*
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* The state of this device (not the otherend's state).
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*/
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XENBUS_IVAR_STATE,
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/*
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* Domain ID of the other end device.
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*/
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XENBUS_IVAR_OTHEREND_ID,
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/*
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* Path of the other end device.
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*/
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XENBUS_IVAR_OTHEREND_PATH
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};
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/*
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* Simplified accessors for xenbus devices
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*/
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#define XENBUS_ACCESSOR(var, ivar, type) \
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__BUS_ACCESSOR(xenbus, var, XENBUS, ivar, type)
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XENBUS_ACCESSOR(node, NODE, const char *)
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XENBUS_ACCESSOR(type, TYPE, const char *)
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XENBUS_ACCESSOR(state, STATE, enum xenbus_state)
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XENBUS_ACCESSOR(otherend_id, OTHEREND_ID, int)
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XENBUS_ACCESSOR(otherend_path, OTHEREND_PATH, const char *)
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/* Register callback to watch this node. */
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struct xenbus_watch
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{
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LIST_ENTRY(xenbus_watch) list;
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/* Path being watched. */
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char *node;
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/* Callback (executed in a process context with no locks held). */
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void (*callback)(struct xenbus_watch *,
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const char **vec, unsigned int len);
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};
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typedef int (*xenstore_event_handler_t)(void *);
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struct xenbus_transaction
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{
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uint32_t id;
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};
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#define XBT_NIL ((struct xenbus_transaction) { 0 })
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int xenbus_directory(struct xenbus_transaction t, const char *dir,
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const char *node, unsigned int *num, char ***result);
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int xenbus_read(struct xenbus_transaction t, const char *dir,
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const char *node, unsigned int *len, void **result);
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int xenbus_write(struct xenbus_transaction t, const char *dir,
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const char *node, const char *string);
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int xenbus_mkdir(struct xenbus_transaction t, const char *dir,
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const char *node);
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int xenbus_exists(struct xenbus_transaction t, const char *dir,
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const char *node);
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int xenbus_rm(struct xenbus_transaction t, const char *dir, const char *node);
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int xenbus_transaction_start(struct xenbus_transaction *t);
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int xenbus_transaction_end(struct xenbus_transaction t, int abort);
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/*
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* Single read and scanf: returns errno or zero. If scancountp is
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* non-null, then number of items scanned is returned in *scanncountp.
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*/
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int xenbus_scanf(struct xenbus_transaction t,
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const char *dir, const char *node, int *scancountp, const char *fmt, ...)
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__attribute__((format(scanf, 5, 6)));
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/* Single printf and write: returns errno or 0. */
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int xenbus_printf(struct xenbus_transaction t,
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const char *dir, const char *node, const char *fmt, ...)
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__attribute__((format(printf, 4, 5)));
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/*
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* Generic read function: NULL-terminated triples of name,
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* sprintf-style type string, and pointer. Returns 0 or errno.
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*/
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int xenbus_gather(struct xenbus_transaction t, const char *dir, ...);
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/* notifer routines for when the xenstore comes up */
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int register_xenstore_notifier(xenstore_event_handler_t func, void *arg, int priority);
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#if 0
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void unregister_xenstore_notifier();
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#endif
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int register_xenbus_watch(struct xenbus_watch *watch);
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void unregister_xenbus_watch(struct xenbus_watch *watch);
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void xs_suspend(void);
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void xs_resume(void);
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/* Used by xenbus_dev to borrow kernel's store connection. */
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int xenbus_dev_request_and_reply(struct xsd_sockmsg *msg, void **result);
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#if 0
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#define XENBUS_IS_ERR_READ(str) ({ \
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if (!IS_ERR(str) && strlen(str) == 0) { \
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free(str, M_DEVBUF); \
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str = ERR_PTR(-ERANGE); \
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} \
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IS_ERR(str); \
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})
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#endif
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#define XENBUS_EXIST_ERR(err) ((err) == ENOENT || (err) == ERANGE)
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/**
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* Register a watch on the given path, using the given xenbus_watch structure
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* for storage, and the given callback function as the callback. Return 0 on
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* success, or errno on error. On success, the given path will be saved as
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* watch->node, and remains the caller's to free. On error, watch->node will
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* be NULL, the device will switch to XenbusStateClosing, and the error will
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* be saved in the store.
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*/
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int xenbus_watch_path(device_t dev, char *path,
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struct xenbus_watch *watch,
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void (*callback)(struct xenbus_watch *,
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const char **, unsigned int));
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/**
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* Register a watch on the given path/path2, using the given xenbus_watch
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* structure for storage, and the given callback function as the callback.
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* Return 0 on success, or errno on error. On success, the watched path
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* (path/path2) will be saved as watch->node, and becomes the caller's to
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* kfree(). On error, watch->node will be NULL, so the caller has nothing to
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* free, the device will switch to XenbusStateClosing, and the error will be
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* saved in the store.
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*/
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int xenbus_watch_path2(device_t dev, const char *path,
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const char *path2, struct xenbus_watch *watch,
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void (*callback)(struct xenbus_watch *,
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const char **, unsigned int));
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/**
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* Advertise in the store a change of the given driver to the given new_state.
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* which case this is performed inside its own transaction. Return 0 on
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* success, or errno on error. On error, the device will switch to
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* XenbusStateClosing, and the error will be saved in the store.
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*/
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int xenbus_switch_state(device_t dev,
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XenbusState new_state);
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/**
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* Grant access to the given ring_mfn to the peer of the given device.
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* Return 0 on success, or errno on error. On error, the device will
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* switch to XenbusStateClosing, and the error will be saved in the
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* store. The grant ring reference is returned in *refp.
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*/
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int xenbus_grant_ring(device_t dev, unsigned long ring_mfn, int *refp);
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/**
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* Allocate an event channel for the given xenbus_device, assigning the newly
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* created local port to *port. Return 0 on success, or errno on error. On
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* error, the device will switch to XenbusStateClosing, and the error will be
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* saved in the store.
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*/
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int xenbus_alloc_evtchn(device_t dev, int *port);
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/**
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* Free an existing event channel. Returns 0 on success or errno on error.
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*/
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int xenbus_free_evtchn(device_t dev, int port);
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/**
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* Return the state of the driver rooted at the given store path, or
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* XenbusStateClosed if no state can be read.
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*/
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XenbusState xenbus_read_driver_state(const char *path);
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/***
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* Report the given negative errno into the store, along with the given
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* formatted message.
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*/
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void xenbus_dev_error(device_t dev, int err, const char *fmt,
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...);
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/***
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* Equivalent to xenbus_dev_error(dev, err, fmt, args), followed by
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* xenbus_switch_state(dev, NULL, XenbusStateClosing) to schedule an orderly
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* closedown of this driver and its peer.
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*/
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void xenbus_dev_fatal(device_t dev, int err, const char *fmt,
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...);
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int xenbus_dev_init(void);
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const char *xenbus_strstate(enum xenbus_state state);
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int xenbus_dev_is_online(device_t dev);
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int xenbus_frontend_closed(device_t dev);
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#endif /* _XEN_XENBUS_XENBUSVAR_H */
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