| /****************************************************************************** |
| * xenbus.h |
| * |
| * Talks to Xen Store to figure out what devices we have. |
| * |
| * Copyright (C) 2005 Rusty Russell, IBM Corporation |
| * Copyright (C) 2005 XenSource Ltd. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation; or, when distributed |
| * separately from the Linux kernel or incorporated into other |
| * software packages, subject to the following license: |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this source file (the "Software"), to deal in the Software without |
| * restriction, including without limitation the rights to use, copy, modify, |
| * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| #ifndef _XEN_XENBUS_H |
| #define _XEN_XENBUS_H |
| |
| #include <linux/device.h> |
| #include <linux/notifier.h> |
| #include <linux/mutex.h> |
| #include <linux/completion.h> |
| #include <linux/init.h> |
| #include <xen/interface/xen.h> |
| #include <xen/interface/grant_table.h> |
| #include <xen/interface/io/xenbus.h> |
| #include <xen/interface/io/xs_wire.h> |
| |
| /* Register callback to watch this node. */ |
| struct xenbus_watch |
| { |
| struct list_head list; |
| |
| /* Path being watched. */ |
| const char *node; |
| |
| /* Callback (executed in a process context with no locks held). */ |
| void (*callback)(struct xenbus_watch *, |
| const char **vec, unsigned int len); |
| }; |
| |
| |
| /* A xenbus device. */ |
| struct xenbus_device { |
| const char *devicetype; |
| const char *nodename; |
| const char *otherend; |
| int otherend_id; |
| struct xenbus_watch otherend_watch; |
| struct device dev; |
| enum xenbus_state state; |
| struct completion down; |
| }; |
| |
| static inline struct xenbus_device *to_xenbus_device(struct device *dev) |
| { |
| return container_of(dev, struct xenbus_device, dev); |
| } |
| |
| struct xenbus_device_id |
| { |
| /* .../device/<device_type>/<identifier> */ |
| char devicetype[32]; /* General class of device. */ |
| }; |
| |
| /* A xenbus driver. */ |
| struct xenbus_driver { |
| char *name; |
| struct module *owner; |
| const struct xenbus_device_id *ids; |
| int (*probe)(struct xenbus_device *dev, |
| const struct xenbus_device_id *id); |
| void (*otherend_changed)(struct xenbus_device *dev, |
| enum xenbus_state backend_state); |
| int (*remove)(struct xenbus_device *dev); |
| int (*suspend)(struct xenbus_device *dev); |
| int (*suspend_cancel)(struct xenbus_device *dev); |
| int (*resume)(struct xenbus_device *dev); |
| int (*uevent)(struct xenbus_device *, char **, int, char *, int); |
| struct device_driver driver; |
| int (*read_otherend_details)(struct xenbus_device *dev); |
| int (*is_ready)(struct xenbus_device *dev); |
| }; |
| |
| static inline struct xenbus_driver *to_xenbus_driver(struct device_driver *drv) |
| { |
| return container_of(drv, struct xenbus_driver, driver); |
| } |
| |
| int __must_check __xenbus_register_frontend(struct xenbus_driver *drv, |
| struct module *owner, |
| const char *mod_name); |
| |
| static inline int __must_check |
| xenbus_register_frontend(struct xenbus_driver *drv) |
| { |
| WARN_ON(drv->owner != THIS_MODULE); |
| return __xenbus_register_frontend(drv, THIS_MODULE, KBUILD_MODNAME); |
| } |
| |
| int __must_check __xenbus_register_backend(struct xenbus_driver *drv, |
| struct module *owner, |
| const char *mod_name); |
| static inline int __must_check |
| xenbus_register_backend(struct xenbus_driver *drv) |
| { |
| WARN_ON(drv->owner != THIS_MODULE); |
| return __xenbus_register_backend(drv, THIS_MODULE, KBUILD_MODNAME); |
| } |
| |
| void xenbus_unregister_driver(struct xenbus_driver *drv); |
| |
| struct xenbus_transaction |
| { |
| u32 id; |
| }; |
| |
| /* Nil transaction ID. */ |
| #define XBT_NIL ((struct xenbus_transaction) { 0 }) |
| |
| char **xenbus_directory(struct xenbus_transaction t, |
| const char *dir, const char *node, unsigned int *num); |
| void *xenbus_read(struct xenbus_transaction t, |
| const char *dir, const char *node, unsigned int *len); |
| int xenbus_write(struct xenbus_transaction t, |
| const char *dir, const char *node, const char *string); |
| int xenbus_mkdir(struct xenbus_transaction t, |
| const char *dir, const char *node); |
| int xenbus_exists(struct xenbus_transaction t, |
| const char *dir, const char *node); |
| int xenbus_rm(struct xenbus_transaction t, const char *dir, const char *node); |
| int xenbus_transaction_start(struct xenbus_transaction *t); |
| int xenbus_transaction_end(struct xenbus_transaction t, int abort); |
| |
| /* Single read and scanf: returns -errno or num scanned if > 0. */ |
| int xenbus_scanf(struct xenbus_transaction t, |
| const char *dir, const char *node, const char *fmt, ...) |
| __attribute__((format(scanf, 4, 5))); |
| |
| /* Single printf and write: returns -errno or 0. */ |
| int xenbus_printf(struct xenbus_transaction t, |
| const char *dir, const char *node, const char *fmt, ...) |
| __attribute__((format(printf, 4, 5))); |
| |
| /* Generic read function: NULL-terminated triples of name, |
| * sprintf-style type string, and pointer. Returns 0 or errno.*/ |
| int xenbus_gather(struct xenbus_transaction t, const char *dir, ...); |
| |
| /* notifer routines for when the xenstore comes up */ |
| extern int xenstored_ready; |
| int register_xenstore_notifier(struct notifier_block *nb); |
| void unregister_xenstore_notifier(struct notifier_block *nb); |
| |
| int register_xenbus_watch(struct xenbus_watch *watch); |
| void unregister_xenbus_watch(struct xenbus_watch *watch); |
| void xs_suspend(void); |
| void xs_resume(void); |
| void xs_suspend_cancel(void); |
| |
| /* Used by xenbus_dev to borrow kernel's store connection. */ |
| void *xenbus_dev_request_and_reply(struct xsd_sockmsg *msg); |
| |
| struct work_struct; |
| |
| /* Prepare for domain suspend: then resume or cancel the suspend. */ |
| void xenbus_suspend(void); |
| void xenbus_resume(void); |
| void xenbus_probe(struct work_struct *); |
| void xenbus_suspend_cancel(void); |
| |
| #define XENBUS_IS_ERR_READ(str) ({ \ |
| if (!IS_ERR(str) && strlen(str) == 0) { \ |
| kfree(str); \ |
| str = ERR_PTR(-ERANGE); \ |
| } \ |
| IS_ERR(str); \ |
| }) |
| |
| #define XENBUS_EXIST_ERR(err) ((err) == -ENOENT || (err) == -ERANGE) |
| |
| int xenbus_watch_path(struct xenbus_device *dev, const char *path, |
| struct xenbus_watch *watch, |
| void (*callback)(struct xenbus_watch *, |
| const char **, unsigned int)); |
| int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch, |
| void (*callback)(struct xenbus_watch *, |
| const char **, unsigned int), |
| const char *pathfmt, ...) |
| __attribute__ ((format (printf, 4, 5))); |
| |
| int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state); |
| int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn); |
| int xenbus_map_ring_valloc(struct xenbus_device *dev, |
| int gnt_ref, void **vaddr); |
| int xenbus_map_ring(struct xenbus_device *dev, int gnt_ref, |
| grant_handle_t *handle, void *vaddr); |
| |
| int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr); |
| int xenbus_unmap_ring(struct xenbus_device *dev, |
| grant_handle_t handle, void *vaddr); |
| |
| int xenbus_alloc_evtchn(struct xenbus_device *dev, int *port); |
| int xenbus_bind_evtchn(struct xenbus_device *dev, int remote_port, int *port); |
| int xenbus_free_evtchn(struct xenbus_device *dev, int port); |
| |
| enum xenbus_state xenbus_read_driver_state(const char *path); |
| |
| void xenbus_dev_error(struct xenbus_device *dev, int err, const char *fmt, ...); |
| void xenbus_dev_fatal(struct xenbus_device *dev, int err, const char *fmt, ...); |
| |
| const char *xenbus_strstate(enum xenbus_state state); |
| int xenbus_dev_is_online(struct xenbus_device *dev); |
| int xenbus_frontend_closed(struct xenbus_device *dev); |
| |
| #endif /* _XEN_XENBUS_H */ |