cregit-Linux how code gets into the kernel

Release 4.7 include/xen/xenbus.h

Directory: include/xen
/******************************************************************************
 * 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/export.h>
#include <linux/completion.h>
#include <linux/init.h>
#include <linux/slab.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>


#define XENBUS_MAX_RING_GRANT_ORDER 4

#define XENBUS_MAX_RING_GRANTS      (1U << XENBUS_MAX_RING_GRANT_ORDER)

#define INVALID_GRANT_HANDLE       (~0U)

/* 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;
	
struct work_struct work;
};


static inline struct xenbus_device *to_xenbus_device(struct device *dev) { return container_of(dev, struct xenbus_device, dev); }

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jeremy fitzhardingejeremy fitzhardinge25100.00%1100.00%
Total25100.00%1100.00%

struct xenbus_device_id { /* .../device/<device_type>/<identifier> */ char devicetype[32]; /* General class of device. */ }; /* A xenbus driver. */ struct xenbus_driver { const char *name; /* defaults to ids[0].devicetype */ 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 (*resume)(struct xenbus_device *dev); int (*uevent)(struct xenbus_device *, struct kobj_uevent_env *); 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); }

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jeremy fitzhardingejeremy fitzhardinge25100.00%1100.00%
Total25100.00%1100.00%

int __must_check __xenbus_register_frontend(struct xenbus_driver *drv, struct module *owner, const char *mod_name); int __must_check __xenbus_register_backend(struct xenbus_driver *drv, struct module *owner, const char *mod_name); #define xenbus_register_frontend(drv) \ __xenbus_register_frontend(drv, THIS_MODULE, KBUILD_MODNAME) #define xenbus_register_backend(drv) \ __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. */ __scanf(4, 5) int xenbus_scanf(struct xenbus_transaction t, const char *dir, const char *node, const char *fmt, ...); /* Single printf and write: returns -errno or 0. */ __printf(4, 5) int xenbus_printf(struct xenbus_transaction t, const char *dir, const char *node, const char *fmt, ...); /* 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)); __printf(4, 5) int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch, void (*callback)(struct xenbus_watch *, const char **, unsigned int), const char *pathfmt, ...); int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state); int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr, unsigned int nr_pages, grant_ref_t *grefs); int xenbus_map_ring_valloc(struct xenbus_device *dev, grant_ref_t *gnt_refs, unsigned int nr_grefs, void **vaddr); int xenbus_map_ring(struct xenbus_device *dev, grant_ref_t *gnt_refs, unsigned int nr_grefs, grant_handle_t *handles, unsigned long *vaddrs, bool *leaked); int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr); int xenbus_unmap_ring(struct xenbus_device *dev, grant_handle_t *handles, unsigned int nr_handles, unsigned long *vaddrs); int xenbus_alloc_evtchn(struct xenbus_device *dev, int *port); int xenbus_free_evtchn(struct xenbus_device *dev, int port); enum xenbus_state xenbus_read_driver_state(const char *path); __printf(3, 4) void xenbus_dev_error(struct xenbus_device *dev, int err, const char *fmt, ...); __printf(3, 4) 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 */

Overall Contributors

PersonTokensPropCommitsCommitProp
jeremy fitzhardingejeremy fitzhardinge91385.57%17.69%
wei liuwei liu484.50%17.69%
david vrabeldavid vrabel444.12%17.69%
joe perchesjoe perches333.09%323.08%
christian limpachchristian limpach121.12%17.69%
aurelien chartieraurelien chartier40.37%17.69%
julien gralljulien grall30.28%17.69%
paul gortmakerpaul gortmaker30.28%17.69%
tejun heotejun heo30.28%17.69%
yuval shaiayuval shaia20.19%17.69%
ian campbellian campbell20.19%17.69%
Total1067100.00%13100.00%
Directory: include/xen
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