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authorBastian Blank <waldi@debian.org>2011-12-10 19:29:47 +0100
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-12-16 13:29:39 -0500
commit2fb3683e7b164ee2b324039f7c9d90fe5b1a259b (patch)
tree7ac2e97b48e0940340c37aae4d08a6b67f1e4fd5 /drivers/xen
parentd8414d3c157dc1f83e73c17447ba41fe5afa9d3d (diff)
xen: Add xenbus device driver
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>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/xenbus/Makefile1
-rw-r--r--drivers/xen/xenbus/xenbus_comms.h4
-rw-r--r--drivers/xen/xenbus/xenbus_dev_frontend.c (renamed from drivers/xen/xenfs/xenbus.c)37
-rw-r--r--drivers/xen/xenfs/Makefile2
-rw-r--r--drivers/xen/xenfs/super.c3
-rw-r--r--drivers/xen/xenfs/xenfs.h1
6 files changed, 42 insertions, 6 deletions
diff --git a/drivers/xen/xenbus/Makefile b/drivers/xen/xenbus/Makefile
index 8dca685358b..a2ea363b9f3 100644
--- a/drivers/xen/xenbus/Makefile
+++ b/drivers/xen/xenbus/Makefile
@@ -1,4 +1,5 @@
obj-y += xenbus.o
+obj-y += xenbus_dev_frontend.o
xenbus-objs =
xenbus-objs += xenbus_client.o
diff --git a/drivers/xen/xenbus/xenbus_comms.h b/drivers/xen/xenbus/xenbus_comms.h
index c21db751373..6e42800fa49 100644
--- a/drivers/xen/xenbus/xenbus_comms.h
+++ b/drivers/xen/xenbus/xenbus_comms.h
@@ -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 */
diff --git a/drivers/xen/xenfs/xenbus.c b/drivers/xen/xenbus/xenbus_dev_frontend.c
index bbd000f88af..fb30cffe033 100644
--- a/drivers/xen/xenfs/xenbus.c
+++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -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);
diff --git a/drivers/xen/xenfs/Makefile b/drivers/xen/xenfs/Makefile
index 5d45ff13cc0..b019865fcc5 100644
--- a/drivers/xen/xenfs/Makefile
+++ b/drivers/xen/xenfs/Makefile
@@ -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
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index a55fbf9a151..a84b53c0143 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -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 },
{""},
diff --git a/drivers/xen/xenfs/xenfs.h b/drivers/xen/xenfs/xenfs.h
index 5056306e7aa..6b80c7779c0 100644
--- a/drivers/xen/xenfs/xenfs.h
+++ b/drivers/xen/xenfs/xenfs.h
@@ -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;