blob: 43e2d7d33976dc982364f599f7336d87ee26dbea [file] [log] [blame]
Jeremy Fitzhardinge4bac07c2007-07-17 18:37:06 -07001/******************************************************************************
2 * xenbus.h
3 *
4 * Talks to Xen Store to figure out what devices we have.
5 *
6 * Copyright (C) 2005 Rusty Russell, IBM Corporation
7 * Copyright (C) 2005 XenSource Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation; or, when distributed
12 * separately from the Linux kernel or incorporated into other
13 * software packages, subject to the following license:
14 *
15 * Permission is hereby granted, free of charge, to any person obtaining a copy
16 * of this source file (the "Software"), to deal in the Software without
17 * restriction, including without limitation the rights to use, copy, modify,
18 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
19 * and to permit persons to whom the Software is furnished to do so, subject to
20 * the following conditions:
21 *
22 * The above copyright notice and this permission notice shall be included in
23 * all copies or substantial portions of the Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
28 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
29 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
30 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
31 * IN THE SOFTWARE.
32 */
33
34#ifndef _XEN_XENBUS_H
35#define _XEN_XENBUS_H
36
37#include <linux/device.h>
38#include <linux/notifier.h>
39#include <linux/mutex.h>
40#include <linux/completion.h>
41#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090042#include <linux/slab.h>
Jeremy Fitzhardinge4bac07c2007-07-17 18:37:06 -070043#include <xen/interface/xen.h>
44#include <xen/interface/grant_table.h>
45#include <xen/interface/io/xenbus.h>
46#include <xen/interface/io/xs_wire.h>
47
48/* Register callback to watch this node. */
49struct xenbus_watch
50{
51 struct list_head list;
52
53 /* Path being watched. */
54 const char *node;
55
56 /* Callback (executed in a process context with no locks held). */
57 void (*callback)(struct xenbus_watch *,
58 const char **vec, unsigned int len);
59};
60
61
62/* A xenbus device. */
63struct xenbus_device {
64 const char *devicetype;
65 const char *nodename;
66 const char *otherend;
67 int otherend_id;
68 struct xenbus_watch otherend_watch;
69 struct device dev;
70 enum xenbus_state state;
71 struct completion down;
72};
73
74static inline struct xenbus_device *to_xenbus_device(struct device *dev)
75{
76 return container_of(dev, struct xenbus_device, dev);
77}
78
79struct xenbus_device_id
80{
81 /* .../device/<device_type>/<identifier> */
82 char devicetype[32]; /* General class of device. */
83};
84
85/* A xenbus driver. */
86struct xenbus_driver {
87 char *name;
88 struct module *owner;
89 const struct xenbus_device_id *ids;
90 int (*probe)(struct xenbus_device *dev,
91 const struct xenbus_device_id *id);
92 void (*otherend_changed)(struct xenbus_device *dev,
93 enum xenbus_state backend_state);
94 int (*remove)(struct xenbus_device *dev);
Ian Campbellde5b31b2009-02-09 12:05:50 -080095 int (*suspend)(struct xenbus_device *dev, pm_message_t state);
Jeremy Fitzhardinge4bac07c2007-07-17 18:37:06 -070096 int (*resume)(struct xenbus_device *dev);
97 int (*uevent)(struct xenbus_device *, char **, int, char *, int);
98 struct device_driver driver;
99 int (*read_otherend_details)(struct xenbus_device *dev);
Christian Limpach1d78d702008-04-02 10:54:04 -0700100 int (*is_ready)(struct xenbus_device *dev);
Jeremy Fitzhardinge4bac07c2007-07-17 18:37:06 -0700101};
102
103static inline struct xenbus_driver *to_xenbus_driver(struct device_driver *drv)
104{
105 return container_of(drv, struct xenbus_driver, driver);
106}
107
108int __must_check __xenbus_register_frontend(struct xenbus_driver *drv,
109 struct module *owner,
110 const char *mod_name);
111
112static inline int __must_check
113xenbus_register_frontend(struct xenbus_driver *drv)
114{
115 WARN_ON(drv->owner != THIS_MODULE);
116 return __xenbus_register_frontend(drv, THIS_MODULE, KBUILD_MODNAME);
117}
118
119int __must_check __xenbus_register_backend(struct xenbus_driver *drv,
120 struct module *owner,
121 const char *mod_name);
122static inline int __must_check
123xenbus_register_backend(struct xenbus_driver *drv)
124{
125 WARN_ON(drv->owner != THIS_MODULE);
126 return __xenbus_register_backend(drv, THIS_MODULE, KBUILD_MODNAME);
127}
128
129void xenbus_unregister_driver(struct xenbus_driver *drv);
130
131struct xenbus_transaction
132{
133 u32 id;
134};
135
136/* Nil transaction ID. */
137#define XBT_NIL ((struct xenbus_transaction) { 0 })
138
Jeremy Fitzhardinge4bac07c2007-07-17 18:37:06 -0700139char **xenbus_directory(struct xenbus_transaction t,
140 const char *dir, const char *node, unsigned int *num);
141void *xenbus_read(struct xenbus_transaction t,
142 const char *dir, const char *node, unsigned int *len);
143int xenbus_write(struct xenbus_transaction t,
144 const char *dir, const char *node, const char *string);
145int xenbus_mkdir(struct xenbus_transaction t,
146 const char *dir, const char *node);
147int xenbus_exists(struct xenbus_transaction t,
148 const char *dir, const char *node);
149int xenbus_rm(struct xenbus_transaction t, const char *dir, const char *node);
150int xenbus_transaction_start(struct xenbus_transaction *t);
151int xenbus_transaction_end(struct xenbus_transaction t, int abort);
152
153/* Single read and scanf: returns -errno or num scanned if > 0. */
154int xenbus_scanf(struct xenbus_transaction t,
155 const char *dir, const char *node, const char *fmt, ...)
156 __attribute__((format(scanf, 4, 5)));
157
158/* Single printf and write: returns -errno or 0. */
159int xenbus_printf(struct xenbus_transaction t,
160 const char *dir, const char *node, const char *fmt, ...)
161 __attribute__((format(printf, 4, 5)));
162
163/* Generic read function: NULL-terminated triples of name,
164 * sprintf-style type string, and pointer. Returns 0 or errno.*/
165int xenbus_gather(struct xenbus_transaction t, const char *dir, ...);
166
167/* notifer routines for when the xenstore comes up */
168extern int xenstored_ready;
169int register_xenstore_notifier(struct notifier_block *nb);
170void unregister_xenstore_notifier(struct notifier_block *nb);
171
172int register_xenbus_watch(struct xenbus_watch *watch);
173void unregister_xenbus_watch(struct xenbus_watch *watch);
174void xs_suspend(void);
175void xs_resume(void);
176void xs_suspend_cancel(void);
177
178/* Used by xenbus_dev to borrow kernel's store connection. */
179void *xenbus_dev_request_and_reply(struct xsd_sockmsg *msg);
180
181struct work_struct;
182
183/* Prepare for domain suspend: then resume or cancel the suspend. */
184void xenbus_suspend(void);
185void xenbus_resume(void);
186void xenbus_probe(struct work_struct *);
187void xenbus_suspend_cancel(void);
188
189#define XENBUS_IS_ERR_READ(str) ({ \
190 if (!IS_ERR(str) && strlen(str) == 0) { \
191 kfree(str); \
192 str = ERR_PTR(-ERANGE); \
193 } \
194 IS_ERR(str); \
195})
196
197#define XENBUS_EXIST_ERR(err) ((err) == -ENOENT || (err) == -ERANGE)
198
199int xenbus_watch_path(struct xenbus_device *dev, const char *path,
200 struct xenbus_watch *watch,
201 void (*callback)(struct xenbus_watch *,
202 const char **, unsigned int));
203int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch,
204 void (*callback)(struct xenbus_watch *,
205 const char **, unsigned int),
206 const char *pathfmt, ...)
207 __attribute__ ((format (printf, 4, 5)));
208
209int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state);
210int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn);
211int xenbus_map_ring_valloc(struct xenbus_device *dev,
212 int gnt_ref, void **vaddr);
213int xenbus_map_ring(struct xenbus_device *dev, int gnt_ref,
214 grant_handle_t *handle, void *vaddr);
215
216int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr);
217int xenbus_unmap_ring(struct xenbus_device *dev,
218 grant_handle_t handle, void *vaddr);
219
220int xenbus_alloc_evtchn(struct xenbus_device *dev, int *port);
221int xenbus_bind_evtchn(struct xenbus_device *dev, int remote_port, int *port);
222int xenbus_free_evtchn(struct xenbus_device *dev, int port);
223
224enum xenbus_state xenbus_read_driver_state(const char *path);
225
226void xenbus_dev_error(struct xenbus_device *dev, int err, const char *fmt, ...);
227void xenbus_dev_fatal(struct xenbus_device *dev, int err, const char *fmt, ...);
228
229const char *xenbus_strstate(enum xenbus_state state);
230int xenbus_dev_is_online(struct xenbus_device *dev);
231int xenbus_frontend_closed(struct xenbus_device *dev);
232
233#endif /* _XEN_XENBUS_H */