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xen: Add xenbus device driver

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Access to xenbus is currently handled via xenfs. This adds a device
driver for xenbus and makes xenfs use this code.

Signed-off-by: Bastian Blank <waldi@debian.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Bastian Blank 2011-12-10 19:29:47 +01:00 committed by Konrad Rzeszutek Wilk
parent d8414d3c15
commit 2fb3683e7b
6 changed files with 42 additions and 6 deletions
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1
drivers/xen/xenbus/Makefile
View File

@ -1,4 +1,5 @@
obj-y += xenbus.o
obj-y += xenbus_dev_frontend.o
xenbus-objs =
xenbus-objs += xenbus_client.o

4
drivers/xen/xenbus/xenbus_comms.h
View File

@ -31,6 +31,8 @@
#ifndef _XENBUS_COMMS_H
#define _XENBUS_COMMS_H
#include <linux/fs.h>
int xs_init(void);
int xb_init_comms(void);
@ -43,4 +45,6 @@ int xs_input_avail(void);
extern struct xenstore_domain_interface *xen_store_interface;
extern int xen_store_evtchn;
extern const struct file_operations xen_xenbus_fops;
#endif /* _XENBUS_COMMS_H */

37
drivers/xen/xenfs/xenbus.c → drivers/xen/xenbus/xenbus_dev_frontend.c
View File

@ -52,13 +52,16 @@
#include <linux/namei.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include "xenfs.h"
#include "../xenbus/xenbus_comms.h"
#include "xenbus_comms.h"
#include <xen/xenbus.h>
#include <asm/xen/hypervisor.h>
MODULE_LICENSE("GPL");
/*
* An element of a list of outstanding transactions, for which we're
* still waiting a reply.
@ -583,7 +586,7 @@ static unsigned int xenbus_file_poll(struct file *file, poll_table *wait)
return 0;
}
const struct file_operations xenbus_file_ops = {
const struct file_operations xen_xenbus_fops = {
.read = xenbus_file_read,
.write = xenbus_file_write,
.open = xenbus_file_open,
@ -591,3 +594,31 @@ const struct file_operations xenbus_file_ops = {
.poll = xenbus_file_poll,
.llseek = no_llseek,
};
EXPORT_SYMBOL_GPL(xen_xenbus_fops);
static struct miscdevice xenbus_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "xen/xenbus",
.fops = &xen_xenbus_fops,
};
static int __init xenbus_init(void)
{
int err;
if (!xen_domain())
return -ENODEV;
err = misc_register(&xenbus_dev);
if (err)
printk(KERN_ERR "Could not register xenbus device\n");
return err;
}
static void __exit xenbus_exit(void)
{
misc_deregister(&xenbus_dev);
}
module_init(xenbus_init);
module_exit(xenbus_exit);

2
drivers/xen/xenfs/Makefile
View File

@ -1,4 +1,4 @@
obj-$(CONFIG_XENFS) += xenfs.o
xenfs-y = super.o xenbus.o
xenfs-y = super.o
xenfs-$(CONFIG_XEN_DOM0) += xenstored.o

3
drivers/xen/xenfs/super.c
View File

@ -17,6 +17,7 @@
#include "xenfs.h"
#include "../privcmd.h"
#include "../xenbus/xenbus_comms.h"
#include <asm/xen/hypervisor.h>
@ -83,7 +84,7 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
{
static struct tree_descr xenfs_files[] = {
[1] = {},
{ "xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR },
{ "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
{ "capabilities", &capabilities_file_ops, S_IRUGO },
{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
{""},

1
drivers/xen/xenfs/xenfs.h
View File

@ -1,7 +1,6 @@
#ifndef _XENFS_XENBUS_H
#define _XENFS_XENBUS_H
extern const struct file_operations xenbus_file_ops;
extern const struct file_operations xsd_kva_file_ops;
extern const struct file_operations xsd_port_file_ops;