drivers/xen/xenbus/xenbus.h

   1 /*
   2  * Private include for xenbus communications.
   3  *
   4  * Copyright (C) 2005 Rusty Russell, IBM Corporation
   5  * Copyright (C) 2005 XenSource Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License version 2
   9  * as published by the Free Software Foundation; or, when distributed
  10  * separately from the Linux kernel or incorporated into other
  11  * software packages, subject to the following license:
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a copy
  14  * of this source file (the "Software"), to deal in the Software without
  15  * restriction, including without limitation the rights to use, copy, modify,
  16  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
  17  * and to permit persons to whom the Software is furnished to do so, subject to
  18  * the following conditions:
  19  *
  20  * The above copyright notice and this permission notice shall be included in
  21  * all copies or substantial portions of the Software.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  24  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  26  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  27  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  28  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  29  * IN THE SOFTWARE.
  30  */
  31
  32 #ifndef _XENBUS_XENBUS_H
  33 #define _XENBUS_XENBUS_H
  34
  35 #include <linux/mutex.h>
  36 #include <linux/uio.h>
  37 #include <xen/xenbus.h>
  38
  39 #define XEN_BUS_ID_SIZE                 20
  40
  41 struct xen_bus_type {
  42         char *root;
  43         unsigned int levels;
  44         int (*get_bus_id)(char bus_id[XEN_BUS_ID_SIZE], const char *nodename);
  45         int (*probe)(struct xen_bus_type *bus, const char *type,
  46                      const char *dir);
  47         bool (*otherend_will_handle)(struct xenbus_watch *watch,
  48                                      const char *path, const char *token);
  49         void (*otherend_changed)(struct xenbus_watch *watch, const char *path,
  50                                  const char *token);
  51         struct bus_type bus;
  52 };
  53
  54 enum xenstore_init {
  55         XS_UNKNOWN,
  56         XS_PV,
  57         XS_HVM,
  58         XS_LOCAL,
  59 };
  60
  61 struct xs_watch_event {
  62         struct list_head list;
  63         unsigned int len;
  64         struct xenbus_watch *handle;
  65         const char *path;
  66         const char *token;
  67         char body[];
  68 };
  69
  70 enum xb_req_state {
  71         xb_req_state_queued,
  72         xb_req_state_wait_reply,
  73         xb_req_state_got_reply,
  74         xb_req_state_aborted
  75 };
  76
  77 struct xb_req_data {
  78         struct list_head list;
  79         wait_queue_head_t wq;
  80         struct xsd_sockmsg msg;
  81         uint32_t caller_req_id;
  82         enum xsd_sockmsg_type type;
  83         char *body;
  84         const struct kvec *vec;
  85         int num_vecs;
  86         int err;
  87         enum xb_req_state state;
  88         bool user_req;
  89         void (*cb)(struct xb_req_data *);
  90         void *par;
  91 };
  92
  93 extern enum xenstore_init xen_store_domain_type;
  94 extern const struct attribute_group *xenbus_dev_groups[];
  95 extern struct mutex xs_response_mutex;
  96 extern struct list_head xs_reply_list;
  97 extern struct list_head xb_write_list;
  98 extern wait_queue_head_t xb_waitq;
  99 extern struct mutex xb_write_mutex;
 100
 101 int xs_init(void);
 102 int xb_init_comms(void);
 103 void xb_deinit_comms(void);
 104 int xs_watch_msg(struct xs_watch_event *event);
 105 void xs_request_exit(struct xb_req_data *req);
 106
 107 int xenbus_match(struct device *_dev, struct device_driver *_drv);
 108 int xenbus_dev_probe(struct device *_dev);
 109 int xenbus_dev_remove(struct device *_dev);
 110 int xenbus_register_driver_common(struct xenbus_driver *drv,
 111                                   struct xen_bus_type *bus,
 112                                   struct module *owner,
 113                                   const char *mod_name);
 114 int xenbus_probe_node(struct xen_bus_type *bus,
 115                       const char *type,
 116                       const char *nodename);
 117 int xenbus_probe_devices(struct xen_bus_type *bus);
 118
 119 void xenbus_dev_changed(const char *node, struct xen_bus_type *bus);
 120
 121 int xenbus_dev_suspend(struct device *dev);
 122 int xenbus_dev_resume(struct device *dev);
 123 int xenbus_dev_cancel(struct device *dev);
 124
 125 void xenbus_otherend_changed(struct xenbus_watch *watch,
 126                              const char *path, const char *token,
 127                              int ignore_on_shutdown);
 128
 129 int xenbus_read_otherend_details(struct xenbus_device *xendev,
 130                                  char *id_node, char *path_node);
 131
 132 void xenbus_ring_ops_init(void);
 133
 134 int xenbus_dev_request_and_reply(struct xsd_sockmsg *msg, void *par);
 135 void xenbus_dev_queue_reply(struct xb_req_data *req);
 136
 137 extern unsigned int xb_dev_generation_id;
 138
 139 #endif