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4bac07c9 JF |
1 | /****************************************************************************** |
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> | |
42 | #include <xen/interface/xen.h> | |
43 | #include <xen/interface/grant_table.h> | |
44 | #include <xen/interface/io/xenbus.h> | |
45 | #include <xen/interface/io/xs_wire.h> | |
46 | ||
47 | /* Register callback to watch this node. */ | |
48 | struct xenbus_watch | |
49 | { | |
50 | struct list_head list; | |
51 | ||
52 | /* Path being watched. */ | |
53 | const char *node; | |
54 | ||
55 | /* Callback (executed in a process context with no locks held). */ | |
56 | void (*callback)(struct xenbus_watch *, | |
57 | const char **vec, unsigned int len); | |
58 | }; | |
59 | ||
60 | ||
61 | /* A xenbus device. */ | |
62 | struct xenbus_device { | |
63 | const char *devicetype; | |
64 | const char *nodename; | |
65 | const char *otherend; | |
66 | int otherend_id; | |
67 | struct xenbus_watch otherend_watch; | |
68 | struct device dev; | |
69 | enum xenbus_state state; | |
70 | struct completion down; | |
71 | }; | |
72 | ||
73 | static inline struct xenbus_device *to_xenbus_device(struct device *dev) | |
74 | { | |
75 | return container_of(dev, struct xenbus_device, dev); | |
76 | } | |
77 | ||
78 | struct xenbus_device_id | |
79 | { | |
80 | /* .../device/<device_type>/<identifier> */ | |
81 | char devicetype[32]; /* General class of device. */ | |
82 | }; | |
83 | ||
84 | /* A xenbus driver. */ | |
85 | struct xenbus_driver { | |
86 | char *name; | |
87 | struct module *owner; | |
88 | const struct xenbus_device_id *ids; | |
89 | int (*probe)(struct xenbus_device *dev, | |
90 | const struct xenbus_device_id *id); | |
91 | void (*otherend_changed)(struct xenbus_device *dev, | |
92 | enum xenbus_state backend_state); | |
93 | int (*remove)(struct xenbus_device *dev); | |
94 | int (*suspend)(struct xenbus_device *dev); | |
95 | int (*suspend_cancel)(struct xenbus_device *dev); | |
96 | 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); | |
100 | }; | |
101 | ||
102 | static inline struct xenbus_driver *to_xenbus_driver(struct device_driver *drv) | |
103 | { | |
104 | return container_of(drv, struct xenbus_driver, driver); | |
105 | } | |
106 | ||
107 | int __must_check __xenbus_register_frontend(struct xenbus_driver *drv, | |
108 | struct module *owner, | |
109 | const char *mod_name); | |
110 | ||
111 | static inline int __must_check | |
112 | xenbus_register_frontend(struct xenbus_driver *drv) | |
113 | { | |
114 | WARN_ON(drv->owner != THIS_MODULE); | |
115 | return __xenbus_register_frontend(drv, THIS_MODULE, KBUILD_MODNAME); | |
116 | } | |
117 | ||
118 | int __must_check __xenbus_register_backend(struct xenbus_driver *drv, | |
119 | struct module *owner, | |
120 | const char *mod_name); | |
121 | static inline int __must_check | |
122 | xenbus_register_backend(struct xenbus_driver *drv) | |
123 | { | |
124 | WARN_ON(drv->owner != THIS_MODULE); | |
125 | return __xenbus_register_backend(drv, THIS_MODULE, KBUILD_MODNAME); | |
126 | } | |
127 | ||
128 | void xenbus_unregister_driver(struct xenbus_driver *drv); | |
129 | ||
130 | struct xenbus_transaction | |
131 | { | |
132 | u32 id; | |
133 | }; | |
134 | ||
135 | /* Nil transaction ID. */ | |
136 | #define XBT_NIL ((struct xenbus_transaction) { 0 }) | |
137 | ||
138 | int __init xenbus_dev_init(void); | |
139 | ||
140 | char **xenbus_directory(struct xenbus_transaction t, | |
141 | const char *dir, const char *node, unsigned int *num); | |
142 | void *xenbus_read(struct xenbus_transaction t, | |
143 | const char *dir, const char *node, unsigned int *len); | |
144 | int xenbus_write(struct xenbus_transaction t, | |
145 | const char *dir, const char *node, const char *string); | |
146 | int xenbus_mkdir(struct xenbus_transaction t, | |
147 | const char *dir, const char *node); | |
148 | int xenbus_exists(struct xenbus_transaction t, | |
149 | const char *dir, const char *node); | |
150 | int xenbus_rm(struct xenbus_transaction t, const char *dir, const char *node); | |
151 | int xenbus_transaction_start(struct xenbus_transaction *t); | |
152 | int xenbus_transaction_end(struct xenbus_transaction t, int abort); | |
153 | ||
154 | /* Single read and scanf: returns -errno or num scanned if > 0. */ | |
155 | int xenbus_scanf(struct xenbus_transaction t, | |
156 | const char *dir, const char *node, const char *fmt, ...) | |
157 | __attribute__((format(scanf, 4, 5))); | |
158 | ||
159 | /* Single printf and write: returns -errno or 0. */ | |
160 | int xenbus_printf(struct xenbus_transaction t, | |
161 | const char *dir, const char *node, const char *fmt, ...) | |
162 | __attribute__((format(printf, 4, 5))); | |
163 | ||
164 | /* Generic read function: NULL-terminated triples of name, | |
165 | * sprintf-style type string, and pointer. Returns 0 or errno.*/ | |
166 | int xenbus_gather(struct xenbus_transaction t, const char *dir, ...); | |
167 | ||
168 | /* notifer routines for when the xenstore comes up */ | |
169 | extern int xenstored_ready; | |
170 | int register_xenstore_notifier(struct notifier_block *nb); | |
171 | void unregister_xenstore_notifier(struct notifier_block *nb); | |
172 | ||
173 | int register_xenbus_watch(struct xenbus_watch *watch); | |
174 | void unregister_xenbus_watch(struct xenbus_watch *watch); | |
175 | void xs_suspend(void); | |
176 | void xs_resume(void); | |
177 | void xs_suspend_cancel(void); | |
178 | ||
179 | /* Used by xenbus_dev to borrow kernel's store connection. */ | |
180 | void *xenbus_dev_request_and_reply(struct xsd_sockmsg *msg); | |
181 | ||
182 | struct work_struct; | |
183 | ||
184 | /* Prepare for domain suspend: then resume or cancel the suspend. */ | |
185 | void xenbus_suspend(void); | |
186 | void xenbus_resume(void); | |
187 | void xenbus_probe(struct work_struct *); | |
188 | void xenbus_suspend_cancel(void); | |
189 | ||
190 | #define XENBUS_IS_ERR_READ(str) ({ \ | |
191 | if (!IS_ERR(str) && strlen(str) == 0) { \ | |
192 | kfree(str); \ | |
193 | str = ERR_PTR(-ERANGE); \ | |
194 | } \ | |
195 | IS_ERR(str); \ | |
196 | }) | |
197 | ||
198 | #define XENBUS_EXIST_ERR(err) ((err) == -ENOENT || (err) == -ERANGE) | |
199 | ||
200 | int xenbus_watch_path(struct xenbus_device *dev, const char *path, | |
201 | struct xenbus_watch *watch, | |
202 | void (*callback)(struct xenbus_watch *, | |
203 | const char **, unsigned int)); | |
204 | int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch, | |
205 | void (*callback)(struct xenbus_watch *, | |
206 | const char **, unsigned int), | |
207 | const char *pathfmt, ...) | |
208 | __attribute__ ((format (printf, 4, 5))); | |
209 | ||
210 | int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state); | |
211 | int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn); | |
212 | int xenbus_map_ring_valloc(struct xenbus_device *dev, | |
213 | int gnt_ref, void **vaddr); | |
214 | int xenbus_map_ring(struct xenbus_device *dev, int gnt_ref, | |
215 | grant_handle_t *handle, void *vaddr); | |
216 | ||
217 | int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr); | |
218 | int xenbus_unmap_ring(struct xenbus_device *dev, | |
219 | grant_handle_t handle, void *vaddr); | |
220 | ||
221 | int xenbus_alloc_evtchn(struct xenbus_device *dev, int *port); | |
222 | int xenbus_bind_evtchn(struct xenbus_device *dev, int remote_port, int *port); | |
223 | int xenbus_free_evtchn(struct xenbus_device *dev, int port); | |
224 | ||
225 | enum xenbus_state xenbus_read_driver_state(const char *path); | |
226 | ||
227 | void xenbus_dev_error(struct xenbus_device *dev, int err, const char *fmt, ...); | |
228 | void xenbus_dev_fatal(struct xenbus_device *dev, int err, const char *fmt, ...); | |
229 | ||
230 | const char *xenbus_strstate(enum xenbus_state state); | |
231 | int xenbus_dev_is_online(struct xenbus_device *dev); | |
232 | int xenbus_frontend_closed(struct xenbus_device *dev); | |
233 | ||
234 | #endif /* _XEN_XENBUS_H */ |