Xenbus public functions
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bouyer
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sys/arch/xen/include/xenbus.h
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sys/arch/xen/include/xenbus.h
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/* $NetBSD: xenbus.h,v 1.1 2006/03/06 20:29:52 bouyer Exp $ */
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/******************************************************************************
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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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#ifndef _ASM_XEN_XENBUS_H
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#define _ASM_XEN_XENBUS_H
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#include <sys/device.h>
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#include <sys/queue.h>
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#include <machine/xen3-public/io/xenbus.h>
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#include <machine/xen3-public/io/xs_wire.h>
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/* xenbus to hypervisor attach */
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struct xenbus_attach_args {
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const char *xa_device;
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int xa_handle;
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};
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/* devices to xenbus attach */
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struct xenbusdev_attach_args {
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const char *xa_type;
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int xa_id;
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struct xenbus_device *xa_xbusd;
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};
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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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SLIST_ENTRY(xenbus_watch) watch_next;
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/* Path being watched. */
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const 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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/* A xenbus device. */
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struct xenbus_device {
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const char xbusd_path[80];
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char *xbusd_otherend;
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int xbusd_otherend_id;
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struct xenbus_watch xbusd_otherend_watch;
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int xbusd_has_error;
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void *xbusd_data;
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};
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struct xenbus_device_id
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{
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/* .../device/<device_type>/<identifier> */
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char devicetype[32]; /* General class of device. */
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};
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/* A xenbus driver. */
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struct xenbus_driver {
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char *name;
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struct module *owner;
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const struct xenbus_device_id *ids;
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int (*probe)(struct xenbus_device *dev,
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const struct xenbus_device_id *id);
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void (*otherend_changed)(struct xenbus_device *dev,
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XenbusState backend_state);
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int (*remove)(struct xenbus_device *dev);
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int (*suspend)(struct xenbus_device *dev);
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int (*resume)(struct xenbus_device *dev);
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int (*hotplug)(struct xenbus_device *, char **, int, char *, int);
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int (*read_otherend_details)(struct xenbus_device *dev);
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};
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int xenbus_register_frontend(struct xenbus_driver *drv);
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int xenbus_register_backend(struct xenbus_driver *drv);
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void xenbus_unregister_driver(struct xenbus_driver *drv);
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struct xenbus_transaction;
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int xenbus_directory(struct xenbus_transaction *t,
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const char *dir, const char *node, unsigned int *num,
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char ***);
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int xenbus_read(struct xenbus_transaction *t,
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const char *dir, const char *node, unsigned int *len,
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char **);
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int xenbus_write(struct xenbus_transaction *t,
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const char *dir, const char *node, const char *string);
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int xenbus_mkdir(struct xenbus_transaction *t,
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const char *dir, const char *node);
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int xenbus_exists(struct xenbus_transaction *t,
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const char *dir, const char *node);
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int xenbus_rm(struct xenbus_transaction *t, const char *dir, const char *node);
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struct xenbus_transaction *xenbus_transaction_start(void);
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int xenbus_transaction_end(struct xenbus_transaction *t, int abort);
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/* Single read and scanf: returns -errno or num scanned if > 0. */
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int xenbus_scanf(struct xenbus_transaction *t,
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const char *dir, const char *node, const char *fmt, ...)
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__attribute__((format(scanf, 4, 5)));
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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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/* 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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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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// XXX int register_xenstore_notifier(struct notifier_block *nb);
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// XXX void unregister_xenstore_notifier(struct notifier_block *nb);
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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 **);
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/* Called from xen core code. */
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void xenbus_suspend(void);
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void xenbus_resume(void);
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void xenbus_probe(void *);
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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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kfree(str); \
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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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#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(struct xenbus_device *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(struct xenbus_device *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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* Perform the change inside the given transaction xbt. xbt may be NULL, in
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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(struct xenbus_device *dev,
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struct xenbus_transaction *xbt,
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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. Return
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* 0 on 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_grant_ring(struct xenbus_device *, paddr_t, grant_ref_t *);
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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(struct xenbus_device *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(struct xenbus_device *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(struct xenbus_device *dev, int err, const char *fmt,
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...);
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#endif /* _ASM_XEN_XENBUS_H */
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/*
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* Local variables:
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* c-file-style: "linux"
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* indent-tabs-mode: t
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* c-indent-level: 8
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* c-basic-offset: 8
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* tab-width: 8
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* End:
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*/
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