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xen/xu-11898-pv-hvm.diff

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# HG changeset patch
# User Ian Campbell <ian.campbell@xensource.com>
# Date Wed Oct 25 13:58:30 2006 +0100
# Node ID 47cc7392741ad120a0c5745f7aeaf00a1aefd538
# parent: 266aef9b0386b0742e05893e24e09375b31bf835
[LINUX] Move xenbus backend probing into a separate source file and
only build it when CONFIG_XEN_BACKEND is set.
This removes unused code from frontend only configurations and also
makes PV-on-HVM drivers on older kernels simpler by removing code
which would otherwise require extra code in the compatability shim.
Signed-off-by: Ian Campbell <ian.campbell@xensource.com>
--- a/linux-2.6-xen-sparse/drivers/xen/xenbus/Makefile Wed Oct 25 13:58:30 2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/xenbus/Makefile Wed Oct 25 13:58:30 2006 +0100
@@ -9,4 +9,5 @@ xenbus-objs += xenbus_comms.o
xenbus-objs += xenbus_comms.o
xenbus-objs += xenbus_xs.o
xenbus-objs += xenbus_probe.o
+obj-$(CONFIG_XEN_BACKEND) += xenbus_probe_backend.o
obj-$(CONFIG_XEN_XENBUS_DEV) += xenbus_dev.o
--- a/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_probe.c Wed Oct 25 13:58:30 2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_probe.c Wed Oct 25 13:58:30 2006 +0100
@@ -56,6 +56,7 @@
#include <xen/hvm.h>
#include "xenbus_comms.h"
+#include "xenbus_probe.h"
int xen_store_evtchn;
struct xenstore_domain_interface *xen_store_interface;
@@ -68,12 +69,7 @@ static void wait_for_devices(struct xenb
static void wait_for_devices(struct xenbus_driver *xendrv);
static int xenbus_probe_frontend(const char *type, const char *name);
-static int xenbus_uevent_backend(struct device *dev, char **envp,
- int num_envp, char *buffer, int buffer_size);
-static int xenbus_probe_backend(const char *type, const char *domid);
-
-static int xenbus_dev_probe(struct device *_dev);
-static int xenbus_dev_remove(struct device *_dev);
+
static void xenbus_dev_shutdown(struct device *_dev);
/* If something in array of ids matches this device, return it. */
@@ -87,7 +83,7 @@ match_device(const struct xenbus_device_
return NULL;
}
-static int xenbus_match(struct device *_dev, struct device_driver *_drv)
+int xenbus_match(struct device *_dev, struct device_driver *_drv)
{
struct xenbus_driver *drv = to_xenbus_driver(_drv);
@@ -96,17 +92,6 @@ static int xenbus_match(struct device *_
return match_device(drv->ids, to_xenbus_device(_dev)) != NULL;
}
-
-struct xen_bus_type
-{
- char *root;
- unsigned int levels;
- int (*get_bus_id)(char bus_id[BUS_ID_SIZE], const char *nodename);
- int (*probe)(const char *type, const char *dir);
- struct bus_type bus;
- struct device dev;
-};
-
/* device/<type>/<id> => <type>-<id> */
static int frontend_bus_id(char bus_id[BUS_ID_SIZE], const char *nodename)
@@ -144,7 +129,7 @@ static void free_otherend_watch(struct x
}
-static int read_otherend_details(struct xenbus_device *xendev,
+int read_otherend_details(struct xenbus_device *xendev,
char *id_node, char *path_node)
{
int err = xenbus_gather(XBT_NIL, xendev->nodename,
@@ -174,12 +159,6 @@ static int read_backend_details(struct x
static int read_backend_details(struct xenbus_device *xendev)
{
return read_otherend_details(xendev, "backend-id", "backend");
-}
-
-
-static int read_frontend_details(struct xenbus_device *xendev)
-{
- return read_otherend_details(xendev, "frontend-id", "frontend");
}
@@ -201,106 +180,6 @@ static struct xen_bus_type xenbus_fronte
},
};
-/* backend/<type>/<fe-uuid>/<id> => <type>-<fe-domid>-<id> */
-static int backend_bus_id(char bus_id[BUS_ID_SIZE], const char *nodename)
-{
- int domid, err;
- const char *devid, *type, *frontend;
- unsigned int typelen;
-
- type = strchr(nodename, '/');
- if (!type)
- return -EINVAL;
- type++;
- typelen = strcspn(type, "/");
- if (!typelen || type[typelen] != '/')
- return -EINVAL;
-
- devid = strrchr(nodename, '/') + 1;
-
- err = xenbus_gather(XBT_NIL, nodename, "frontend-id", "%i", &domid,
- "frontend", NULL, &frontend,
- NULL);
- if (err)
- return err;
- if (strlen(frontend) == 0)
- err = -ERANGE;
- if (!err && !xenbus_exists(XBT_NIL, frontend, ""))
- err = -ENOENT;
-
- kfree(frontend);
-
- if (err)
- return err;
-
- if (snprintf(bus_id, BUS_ID_SIZE,
- "%.*s-%i-%s", typelen, type, domid, devid) >= BUS_ID_SIZE)
- return -ENOSPC;
- return 0;
-}
-
-static struct xen_bus_type xenbus_backend = {
- .root = "backend",
- .levels = 3, /* backend/type/<frontend>/<id> */
- .get_bus_id = backend_bus_id,
- .probe = xenbus_probe_backend,
- .bus = {
- .name = "xen-backend",
- .match = xenbus_match,
- .probe = xenbus_dev_probe,
- .remove = xenbus_dev_remove,
-// .shutdown = xenbus_dev_shutdown,
- .uevent = xenbus_uevent_backend,
- },
- .dev = {
- .bus_id = "xen-backend",
- },
-};
-
-static int xenbus_uevent_backend(struct device *dev, char **envp,
- int num_envp, char *buffer, int buffer_size)
-{
- struct xenbus_device *xdev;
- struct xenbus_driver *drv;
- int i = 0;
- int length = 0;
-
- DPRINTK("");
-
- if (dev == NULL)
- return -ENODEV;
-
- xdev = to_xenbus_device(dev);
- if (xdev == NULL)
- return -ENODEV;
-
- /* stuff we want to pass to /sbin/hotplug */
- add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
- "XENBUS_TYPE=%s", xdev->devicetype);
-
- add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
- "XENBUS_PATH=%s", xdev->nodename);
-
- add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
- "XENBUS_BASE_PATH=%s", xenbus_backend.root);
-
- /* terminate, set to next free slot, shrink available space */
- envp[i] = NULL;
- envp = &envp[i];
- num_envp -= i;
- buffer = &buffer[length];
- buffer_size -= length;
-
- if (dev->driver) {
- drv = to_xenbus_driver(dev->driver);
- if (drv && drv->uevent)
- return drv->uevent(xdev, envp, num_envp, buffer,
- buffer_size);
- }
-
- return 0;
-}
-
static void otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
{
@@ -360,7 +239,7 @@ static int watch_otherend(struct xenbus_
}
-static int xenbus_dev_probe(struct device *_dev)
+int xenbus_dev_probe(struct device *_dev)
{
struct xenbus_device *dev = to_xenbus_device(_dev);
struct xenbus_driver *drv = to_xenbus_driver(_dev->driver);
@@ -407,7 +286,7 @@ fail:
return -ENODEV;
}
-static int xenbus_dev_remove(struct device *_dev)
+int xenbus_dev_remove(struct device *_dev)
{
struct xenbus_device *dev = to_xenbus_device(_dev);
struct xenbus_driver *drv = to_xenbus_driver(_dev->driver);
@@ -445,8 +324,8 @@ static void xenbus_dev_shutdown(struct d
put_device(&dev->dev);
}
-static int xenbus_register_driver_common(struct xenbus_driver *drv,
- struct xen_bus_type *bus)
+int xenbus_register_driver_common(struct xenbus_driver *drv,
+ struct xen_bus_type *bus)
{
int ret;
@@ -476,14 +355,6 @@ int xenbus_register_frontend(struct xenb
return 0;
}
EXPORT_SYMBOL_GPL(xenbus_register_frontend);
-
-int xenbus_register_backend(struct xenbus_driver *drv)
-{
- drv->read_otherend_details = read_frontend_details;
-
- return xenbus_register_driver_common(drv, &xenbus_backend);
-}
-EXPORT_SYMBOL_GPL(xenbus_register_backend);
void xenbus_unregister_driver(struct xenbus_driver *drv)
{
@@ -596,9 +467,9 @@ DEVICE_ATTR(devtype, S_IRUSR | S_IRGRP |
DEVICE_ATTR(devtype, S_IRUSR | S_IRGRP | S_IROTH, xendev_show_devtype, NULL);
-static int xenbus_probe_node(struct xen_bus_type *bus,
- const char *type,
- const char *nodename)
+int xenbus_probe_node(struct xen_bus_type *bus,
+ const char *type,
+ const char *nodename)
{
int err;
struct xenbus_device *xendev;
@@ -668,55 +539,6 @@ static int xenbus_probe_frontend(const c
return err;
}
-/* backend/<typename>/<frontend-uuid>/<name> */
-static int xenbus_probe_backend_unit(const char *dir,
- const char *type,
- const char *name)
-{
- char *nodename;
- int err;
-
- nodename = kasprintf("%s/%s", dir, name);
- if (!nodename)
- return -ENOMEM;
-
- DPRINTK("%s\n", nodename);
-
- err = xenbus_probe_node(&xenbus_backend, type, nodename);
- kfree(nodename);
- return err;
-}
-
-/* backend/<typename>/<frontend-domid> */
-static int xenbus_probe_backend(const char *type, const char *domid)
-{
- char *nodename;
- int err = 0;
- char **dir;
- unsigned int i, dir_n = 0;
-
- DPRINTK("");
-
- nodename = kasprintf("%s/%s/%s", xenbus_backend.root, type, domid);
- if (!nodename)
- return -ENOMEM;
-
- dir = xenbus_directory(XBT_NIL, nodename, "", &dir_n);
- if (IS_ERR(dir)) {
- kfree(nodename);
- return PTR_ERR(dir);
- }
-
- for (i = 0; i < dir_n; i++) {
- err = xenbus_probe_backend_unit(nodename, type, dir[i]);
- if (err)
- break;
- }
- kfree(dir);
- kfree(nodename);
- return err;
-}
-
static int xenbus_probe_device_type(struct xen_bus_type *bus, const char *type)
{
int err = 0;
@@ -737,7 +559,7 @@ static int xenbus_probe_device_type(stru
return err;
}
-static int xenbus_probe_devices(struct xen_bus_type *bus)
+int xenbus_probe_devices(struct xen_bus_type *bus)
{
int err = 0;
char **dir;
@@ -779,7 +601,7 @@ static int strsep_len(const char *str, c
return (len == 0) ? i : -ERANGE;
}
-static void dev_changed(const char *node, struct xen_bus_type *bus)
+void dev_changed(const char *node, struct xen_bus_type *bus)
{
int exists, rootlen;
struct xenbus_device *dev;
@@ -824,23 +646,10 @@ static void frontend_changed(struct xenb
dev_changed(vec[XS_WATCH_PATH], &xenbus_frontend);
}
-static void backend_changed(struct xenbus_watch *watch,
- const char **vec, unsigned int len)
-{
- DPRINTK("");
-
- dev_changed(vec[XS_WATCH_PATH], &xenbus_backend);
-}
-
/* We watch for devices appearing and vanishing. */
static struct xenbus_watch fe_watch = {
.node = "device",
.callback = frontend_changed,
-};
-
-static struct xenbus_watch be_watch = {
- .node = "backend",
- .callback = backend_changed,
};
static int suspend_dev(struct device *dev, void *data)
@@ -913,7 +722,7 @@ void xenbus_suspend(void)
DPRINTK("");
bus_for_each_dev(&xenbus_frontend.bus, NULL, NULL, suspend_dev);
- bus_for_each_dev(&xenbus_backend.bus, NULL, NULL, suspend_dev);
+ xenbus_backend_suspend(suspend_dev);
xs_suspend();
}
EXPORT_SYMBOL_GPL(xenbus_suspend);
@@ -923,7 +732,7 @@ void xenbus_resume(void)
xb_init_comms();
xs_resume();
bus_for_each_dev(&xenbus_frontend.bus, NULL, NULL, resume_dev);
- bus_for_each_dev(&xenbus_backend.bus, NULL, NULL, resume_dev);
+ xenbus_backend_resume(resume_dev);
}
EXPORT_SYMBOL_GPL(xenbus_resume);
@@ -956,13 +765,10 @@ void xenbus_probe(void *unused)
{
BUG_ON((xenstored_ready <= 0));
- /* Enumerate devices in xenstore. */
+ /* Enumerate devices in xenstore and watch for changes. */
xenbus_probe_devices(&xenbus_frontend);
- xenbus_probe_devices(&xenbus_backend);
-
- /* Watch for changes. */
register_xenbus_watch(&fe_watch);
- register_xenbus_watch(&be_watch);
+ xenbus_backend_probe_and_watch();
/* Notify others that xenstore is up */
notifier_call_chain(&xenstore_chain, 0, NULL);
@@ -1021,7 +827,7 @@ static int __init xenbus_probe_init(void
/* Register ourselves with the kernel bus subsystem */
bus_register(&xenbus_frontend.bus);
- bus_register(&xenbus_backend.bus);
+ xenbus_backend_bus_register();
/*
* Domain0 doesn't have a store_evtchn or store_mfn yet.
@@ -1092,7 +898,7 @@ static int __init xenbus_probe_init(void
/* Register ourselves with the kernel device subsystem */
device_register(&xenbus_frontend.dev);
- device_register(&xenbus_backend.dev);
+ xenbus_backend_device_register();
if (!is_initial_xendomain())
xenbus_probe(NULL);
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_probe.h Wed Oct 25 13:58:30 2006 +0100
@@ -0,0 +1,77 @@
+/******************************************************************************
+ * xenbus_probe.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 _XENBUS_PROBE_H
+#define _XENBUS_PROBE_H
+
+#ifdef CONFIG_XEN_BACKEND
+extern void xenbus_backend_suspend(int (*fn)(struct device *, void *));
+extern void xenbus_backend_resume(int (*fn)(struct device *, void *));
+extern void xenbus_backend_probe_and_watch(void);
+extern void xenbus_backend_bus_register(void);
+extern void xenbus_backend_device_register(void);
+#else
+static inline void xenbus_backend_suspend(int (*fn)(struct device *, void *)) {}
+static inline void xenbus_backend_resume(int (*fn)(struct device *, void *)) {}
+static inline void xenbus_backend_probe_and_watch(void) {}
+static inline void xenbus_backend_bus_register(void) {}
+static inline void xenbus_backend_device_register(void) {}
+#endif
+
+struct xen_bus_type
+{
+ char *root;
+ unsigned int levels;
+ int (*get_bus_id)(char bus_id[BUS_ID_SIZE], const char *nodename);
+ int (*probe)(const char *type, const char *dir);
+ struct bus_type bus;
+ struct device dev;
+};
+
+extern int xenbus_match(struct device *_dev, struct device_driver *_drv);
+extern int xenbus_dev_probe(struct device *_dev);
+extern int xenbus_dev_remove(struct device *_dev);
+extern int xenbus_register_driver_common(struct xenbus_driver *drv,
+ struct xen_bus_type *bus);
+extern int xenbus_probe_node(struct xen_bus_type *bus,
+ const char *type,
+ const char *nodename);
+extern int xenbus_probe_devices(struct xen_bus_type *bus);
+
+extern void dev_changed(const char *node, struct xen_bus_type *bus);
+
+/* Simplified asprintf. Probably belongs in lib */
+extern char *kasprintf(const char *fmt, ...);
+
+#endif
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_probe_backend.c Wed Oct 25 13:58:30 2006 +0100
@@ -0,0 +1,271 @@
+/******************************************************************************
+ * Talks to Xen Store to figure out what devices we have (backend half).
+ *
+ * Copyright (C) 2005 Rusty Russell, IBM Corporation
+ * Copyright (C) 2005 Mike Wray, Hewlett-Packard
+ * Copyright (C) 2005, 2006 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.
+ */
+
+#define DPRINTK(fmt, args...) \
+ pr_debug("xenbus_probe (%s:%d) " fmt ".\n", \
+ __FUNCTION__, __LINE__, ##args)
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/notifier.h>
+#include <linux/kthread.h>
+
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/maddr.h>
+#include <asm/pgtable.h>
+#include <asm/hypervisor.h>
+#include <xen/xenbus.h>
+#include <xen/xen_proc.h>
+#include <xen/evtchn.h>
+#include <xen/features.h>
+#include <xen/hvm.h>
+
+#include "xenbus_comms.h"
+#include "xenbus_probe.h"
+
+#ifdef HAVE_XEN_PLATFORM_COMPAT_H
+#include <xen/platform-compat.h>
+#endif
+
+static int xenbus_uevent_backend(struct device *dev, char **envp,
+ int num_envp, char *buffer, int buffer_size);
+static int xenbus_probe_backend(const char *type, const char *domid);
+
+extern int read_otherend_details(struct xenbus_device *xendev,
+ char *id_node, char *path_node);
+
+static int read_frontend_details(struct xenbus_device *xendev)
+{
+ return read_otherend_details(xendev, "frontend-id", "frontend");
+}
+
+/* backend/<type>/<fe-uuid>/<id> => <type>-<fe-domid>-<id> */
+static int backend_bus_id(char bus_id[BUS_ID_SIZE], const char *nodename)
+{
+ int domid, err;
+ const char *devid, *type, *frontend;
+ unsigned int typelen;
+
+ type = strchr(nodename, '/');
+ if (!type)
+ return -EINVAL;
+ type++;
+ typelen = strcspn(type, "/");
+ if (!typelen || type[typelen] != '/')
+ return -EINVAL;
+
+ devid = strrchr(nodename, '/') + 1;
+
+ err = xenbus_gather(XBT_NIL, nodename, "frontend-id", "%i", &domid,
+ "frontend", NULL, &frontend,
+ NULL);
+ if (err)
+ return err;
+ if (strlen(frontend) == 0)
+ err = -ERANGE;
+ if (!err && !xenbus_exists(XBT_NIL, frontend, ""))
+ err = -ENOENT;
+ kfree(frontend);
+
+ if (err)
+ return err;
+
+ if (snprintf(bus_id, BUS_ID_SIZE,
+ "%.*s-%i-%s", typelen, type, domid, devid) >= BUS_ID_SIZE)
+ return -ENOSPC;
+ return 0;
+}
+
+static struct xen_bus_type xenbus_backend = {
+ .root = "backend",
+ .levels = 3, /* backend/type/<frontend>/<id> */
+ .get_bus_id = backend_bus_id,
+ .probe = xenbus_probe_backend,
+ .bus = {
+ .name = "xen-backend",
+ .match = xenbus_match,
+ .probe = xenbus_dev_probe,
+ .remove = xenbus_dev_remove,
+// .shutdown = xenbus_dev_shutdown,
+ .uevent = xenbus_uevent_backend,
+ },
+ .dev = {
+ .bus_id = "xen-backend",
+ },
+};
+
+static int xenbus_uevent_backend(struct device *dev, char **envp,
+ int num_envp, char *buffer, int buffer_size)
+{
+ struct xenbus_device *xdev;
+ struct xenbus_driver *drv;
+ int i = 0;
+ int length = 0;
+
+ DPRINTK("");
+
+ if (dev == NULL)
+ return -ENODEV;
+
+ xdev = to_xenbus_device(dev);
+ if (xdev == NULL)
+ return -ENODEV;
+
+ /* stuff we want to pass to /sbin/hotplug */
+ add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
+ "XENBUS_TYPE=%s", xdev->devicetype);
+
+ add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
+ "XENBUS_PATH=%s", xdev->nodename);
+
+ add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
+ "XENBUS_BASE_PATH=%s", xenbus_backend.root);
+
+ /* terminate, set to next free slot, shrink available space */
+ envp[i] = NULL;
+ envp = &envp[i];
+ num_envp -= i;
+ buffer = &buffer[length];
+ buffer_size -= length;
+
+ if (dev->driver) {
+ drv = to_xenbus_driver(dev->driver);
+ if (drv && drv->uevent)
+ return drv->uevent(xdev, envp, num_envp, buffer,
+ buffer_size);
+ }
+
+ return 0;
+}
+
+int xenbus_register_backend(struct xenbus_driver *drv)
+{
+ drv->read_otherend_details = read_frontend_details;
+
+ return xenbus_register_driver_common(drv, &xenbus_backend);
+}
+EXPORT_SYMBOL_GPL(xenbus_register_backend);
+
+/* backend/<typename>/<frontend-uuid>/<name> */
+static int xenbus_probe_backend_unit(const char *dir,
+ const char *type,
+ const char *name)
+{
+ char *nodename;
+ int err;
+
+ nodename = kasprintf("%s/%s", dir, name);
+ if (!nodename)
+ return -ENOMEM;
+
+ DPRINTK("%s\n", nodename);
+
+ err = xenbus_probe_node(&xenbus_backend, type, nodename);
+ kfree(nodename);
+ return err;
+}
+
+/* backend/<typename>/<frontend-domid> */
+static int xenbus_probe_backend(const char *type, const char *domid)
+{
+ char *nodename;
+ int err = 0;
+ char **dir;
+ unsigned int i, dir_n = 0;
+
+ DPRINTK("");
+
+ nodename = kasprintf("%s/%s/%s", xenbus_backend.root, type, domid);
+ if (!nodename)
+ return -ENOMEM;
+
+ dir = xenbus_directory(XBT_NIL, nodename, "", &dir_n);
+ if (IS_ERR(dir)) {
+ kfree(nodename);
+ return PTR_ERR(dir);
+ }
+
+ for (i = 0; i < dir_n; i++) {
+ err = xenbus_probe_backend_unit(nodename, type, dir[i]);
+ if (err)
+ break;
+ }
+ kfree(dir);
+ kfree(nodename);
+ return err;
+}
+
+static void backend_changed(struct xenbus_watch *watch,
+ const char **vec, unsigned int len)
+{
+ DPRINTK("");
+
+ dev_changed(vec[XS_WATCH_PATH], &xenbus_backend);
+}
+
+static struct xenbus_watch be_watch = {
+ .node = "backend",
+ .callback = backend_changed,
+};
+
+void xenbus_backend_suspend(int (*fn)(struct device *, void *))
+{
+ DPRINTK("");
+ bus_for_each_dev(&xenbus_backend.bus, NULL, NULL, fn);
+}
+
+void xenbus_backend_resume(int (*fn)(struct device *, void *))
+{
+ DPRINTK("");
+ bus_for_each_dev(&xenbus_backend.bus, NULL, NULL, fn);
+}
+
+void xenbus_backend_probe_and_watch(void)
+{
+ xenbus_probe_devices(&xenbus_backend);
+ register_xenbus_watch(&be_watch);
+}
+
+void xenbus_backend_bus_register(void)
+{
+ bus_register(&xenbus_backend.bus);
+}
+
+void xenbus_backend_device_register(void)
+{
+ device_register(&xenbus_backend.dev);
+}
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