Staging: hv: add the Hyper-V virtual bus

This is the virtual bus that all of the Linux Hyper-V drivers use.

Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1228 insertions, 0 deletions

diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
new file mode 100644
index 0000000..0acf42c
--- /dev/null
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -0,0 +1,1228 @@
+/*
+ *
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ *
+ */
+
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/sysctl.h>
+
+#include "logging.h"
+#include "vmbus.h"
+
+//
+// Defines
+//
+
+// FIXME! We need to do this dynamically for PIC and APIC system
+#define VMBUS_IRQ				0x5
+#ifdef KERNEL_2_6_27
+#define VMBUS_IRQ_VECTOR     IRQ5_VECTOR
+#endif
+//
+// Data types
+//
+
+// Main vmbus driver data structure
+struct vmbus_driver_context {
+	// !! These must be the first 2 fields !!
+	// The driver field is not used in here. Instead, the bus field is
+	// used to represent the driver
+	struct driver_context	drv_ctx;
+	VMBUS_DRIVER_OBJECT		drv_obj;
+
+	struct bus_type			bus;
+	struct tasklet_struct	msg_dpc;
+	struct tasklet_struct	event_dpc;
+
+	// The bus root device
+	struct device_context	device_ctx;
+};
+
+//
+// Static decl
+//
+static int vmbus_match(struct device *device, struct device_driver *driver);
+static int vmbus_probe(struct device *device);
+static int vmbus_remove(struct device *device);
+static void vmbus_shutdown(struct device *device);
+#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
+#elif defined(KERNEL_2_6_27)
+static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
+#else
+static int vmbus_uevent(struct device *device, char **envp, int num_envp, char *buffer, int buffer_size);
+#endif
+static void vmbus_msg_dpc(unsigned long data);
+static void vmbus_event_dpc(unsigned long data);
+
+#ifdef KERNEL_2_6_27
+static irqreturn_t vmbus_isr(int irq, void* dev_id);
+#else
+static int vmbus_isr(int irq, void* dev_id, struct pt_regs *regs);
+#endif
+
+static void vmbus_device_release(struct device *device);
+static void vmbus_bus_release(struct device *device);
+
+static DEVICE_OBJECT* vmbus_child_device_create(GUID type, GUID instance, void* context);
+static void vmbus_child_device_destroy(DEVICE_OBJECT* device_obj);
+static int vmbus_child_device_register(DEVICE_OBJECT* root_device_obj, DEVICE_OBJECT* child_device_obj);
+static void vmbus_child_device_unregister(DEVICE_OBJECT* child_device_obj);
+static void vmbus_child_device_get_info(DEVICE_OBJECT *device_obj, DEVICE_INFO *device_info);
+
+//static ssize_t vmbus_show_class_id(struct device *dev, struct device_attribute *attr, char *buf);
+//static ssize_t vmbus_show_device_id(struct device *dev, struct device_attribute *attr, char *buf);
+
+static ssize_t vmbus_show_device_attr(struct device *dev, struct device_attribute *dev_attr, char *buf);
+
+//
+// Global
+//
+
+// Global logging setting
+
+//unsigned int vmbus_loglevel= (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT);
+//unsigned int vmbus_loglevel= (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT);
+unsigned int vmbus_loglevel= (ALL_MODULES << 16 | INFO_LVL);
+EXPORT_SYMBOL(vmbus_loglevel);
+
+static int vmbus_irq = VMBUS_IRQ;
+
+// Setup /proc/sys/bus/vmbus/vmbus_loglevel
+// Allow usage of sysctl cmd to set the logging level
+static struct ctl_table_header *vmbus_ctl_table_hdr;
+
+static ctl_table vmbus_dev_ctl_table[] = {
+	{ .ctl_name	= 8461,
+	  .procname	= "vmbus_loglevel",
+	  .data		= &vmbus_loglevel,
+	  .maxlen	= sizeof(vmbus_loglevel),
+	  .mode		= 0644,
+	  .proc_handler	= &proc_dointvec },
+	{ }
+};
+
+static ctl_table vmbus_ctl_table[] = {
+	{ .ctl_name	= CTL_DEV,
+	  .procname	= "vmbus",
+	  .mode		= 0555,
+	  .child	= vmbus_dev_ctl_table },
+	{ }
+};
+
+static ctl_table vmus_root_ctl_table[] = {
+	{ .ctl_name	= CTL_BUS,
+	  .procname	= "bus",
+	  .mode		= 0555,
+	  .child	= vmbus_ctl_table },
+	{ }
+};
+
+#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
+#else
+//
+// Set up per device attributes in /sys/bus/vmbus/devices/<bus device>
+//
+static struct device_attribute vmbus_device_attrs[] = {
+	__ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
+
+	__ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
+
+	__ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
+
+	__ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
+
+	__ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
+	__ATTR_NULL
+};
+#endif
+
+// The one and only one
+static struct vmbus_driver_context g_vmbus_drv={
+	.bus.name	= "vmbus",
+	.bus.match	= vmbus_match,
+#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
+#else
+	.bus.shutdown = vmbus_shutdown,
+	.bus.remove = vmbus_remove,
+	.bus.probe	= vmbus_probe,
+	.bus.uevent = vmbus_uevent,
+	.bus.dev_attrs = vmbus_device_attrs,
+#endif
+};
+
+//
+// Routines
+//
+
+
+/*++
+
+Name:	vmbus_show_device_attr()
+
+Desc:	Show the device attribute in sysfs. This is invoked when user does a "cat /sys/bus/vmbus/devices/<bus device>/<attr name>"
+
+--*/
+static ssize_t vmbus_show_device_attr(struct device *dev, struct device_attribute *dev_attr, char *buf)
+{
+	struct device_context *device_ctx = device_to_device_context(dev);
+	DEVICE_INFO device_info;
+
+	memset(&device_info, 0, sizeof(DEVICE_INFO));
+
+	vmbus_child_device_get_info(&device_ctx->device_obj, &device_info);
+
+	if (!strcmp(dev_attr->attr.name, "class_id"))
+	{
+		return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}\n",
+			device_info.ChannelType.Data[3], device_info.ChannelType.Data[2], device_info.ChannelType.Data[1], device_info.ChannelType.Data[0],
+			device_info.ChannelType.Data[5], device_info.ChannelType.Data[4],
+			device_info.ChannelType.Data[7], device_info.ChannelType.Data[6],
+			device_info.ChannelType.Data[8], device_info.ChannelType.Data[9], device_info.ChannelType.Data[10], device_info.ChannelType.Data[11], device_info.ChannelType.Data[12], device_info.ChannelType.Data[13], device_info.ChannelType.Data[14], device_info.ChannelType.Data[15]);
+
+	}
+	else if (!strcmp(dev_attr->attr.name, "device_id"))
+	{
+		return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}\n",
+			device_info.ChannelInstance.Data[3], device_info.ChannelInstance.Data[2], device_info.ChannelInstance.Data[1], device_info.ChannelInstance.Data[0],
+			device_info.ChannelInstance.Data[5], device_info.ChannelInstance.Data[4],
+			device_info.ChannelInstance.Data[7], device_info.ChannelInstance.Data[6],
+			device_info.ChannelInstance.Data[8], device_info.ChannelInstance.Data[9], device_info.ChannelInstance.Data[10], device_info.ChannelInstance.Data[11], device_info.ChannelInstance.Data[12], device_info.ChannelInstance.Data[13], device_info.ChannelInstance.Data[14], device_info.ChannelInstance.Data[15]);
+	}
+	else if (!strcmp(dev_attr->attr.name, "state"))
+	{
+		return sprintf(buf, "%d\n", device_info.ChannelState);
+	}
+	else if (!strcmp(dev_attr->attr.name, "id"))
+	{
+		return sprintf(buf, "%d\n", device_info.ChannelId);
+	}
+	else if (!strcmp(dev_attr->attr.name, "out_intr_mask"))
+	{
+		return sprintf(buf, "%d\n", device_info.Outbound.InterruptMask);
+	}
+	else if (!strcmp(dev_attr->attr.name, "out_read_index"))
+	{
+		return sprintf(buf, "%d\n", device_info.Outbound.ReadIndex);
+	}
+	else if (!strcmp(dev_attr->attr.name, "out_write_index"))
+	{
+		return sprintf(buf, "%d\n", device_info.Outbound.WriteIndex);
+	}
+	else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail"))
+	{
+		return sprintf(buf, "%d\n", device_info.Outbound.BytesAvailToRead);
+	}
+	else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail"))
+	{
+		return sprintf(buf, "%d\n", device_info.Outbound.BytesAvailToWrite);
+	}
+	else if (!strcmp(dev_attr->attr.name, "in_intr_mask"))
+	{
+		return sprintf(buf, "%d\n", device_info.Inbound.InterruptMask);
+	}
+	else if (!strcmp(dev_attr->attr.name, "in_read_index"))
+	{
+		return sprintf(buf, "%d\n", device_info.Inbound.ReadIndex);
+	}
+	else if (!strcmp(dev_attr->attr.name, "in_write_index"))
+	{
+		return sprintf(buf, "%d\n", device_info.Inbound.WriteIndex);
+	}
+	else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail"))
+	{
+		return sprintf(buf, "%d\n", device_info.Inbound.BytesAvailToRead);
+	}
+	else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail"))
+	{
+		return sprintf(buf, "%d\n", device_info.Inbound.BytesAvailToWrite);
+	}
+	else if (!strcmp(dev_attr->attr.name, "monitor_id"))
+	{
+		return sprintf(buf, "%d\n", device_info.MonitorId);
+	}
+	else if (!strcmp(dev_attr->attr.name, "server_monitor_pending"))
+	{
+		return sprintf(buf, "%d\n", device_info.ServerMonitorPending);
+	}
+	else if (!strcmp(dev_attr->attr.name, "server_monitor_latency"))
+	{
+		return sprintf(buf, "%d\n", device_info.ServerMonitorLatency);
+	}
+	else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id"))
+	{
+		return sprintf(buf, "%d\n", device_info.ServerMonitorConnectionId);
+	}
+	else if (!strcmp(dev_attr->attr.name, "client_monitor_pending"))
+	{
+		return sprintf(buf, "%d\n", device_info.ClientMonitorPending);
+	}
+	else if (!strcmp(dev_attr->attr.name, "client_monitor_latency"))
+	{
+		return sprintf(buf, "%d\n", device_info.ClientMonitorLatency);
+	}
+	else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id"))
+	{
+		return sprintf(buf, "%d\n", device_info.ClientMonitorConnectionId);
+	}
+	else
+	{
+		return 0;
+	}
+}
+
+/*++
+
+Name:	vmbus_show_class_id()
+
+Desc:	Show the device class id in sysfs
+
+--*/
+//static ssize_t vmbus_show_class_id(struct device *dev, struct device_attribute *attr, char *buf)
+//{
+//	struct device_context *device_ctx = device_to_device_context(dev);
+//	return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}\n",
+//		device_ctx->class_id[3], device_ctx->class_id[2], device_ctx->class_id[1], device_ctx->class_id[0],
+//		device_ctx->class_id[5], device_ctx->class_id[4],
+//		device_ctx->class_id[7], device_ctx->class_id[6],
+//		device_ctx->class_id[8], device_ctx->class_id[9], device_ctx->class_id[10], device_ctx->class_id[11], device_ctx->class_id[12], device_ctx->class_id[13], device_ctx->class_id[14], device_ctx->class_id[15]);
+//}
+
+/*++
+
+Name:	vmbus_show_device_id()
+
+Desc:	Show the device instance id in sysfs
+
+--*/
+//static ssize_t vmbus_show_device_id(struct device *dev, struct device_attribute *attr, char *buf)
+//{
+//	struct device_context *device_ctx = device_to_device_context(dev);
+//	return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}\n",
+//		device_ctx->device_id[3], device_ctx->device_id[2], device_ctx->device_id[1], device_ctx->device_id[0],
+//		device_ctx->device_id[5], device_ctx->device_id[4],
+//		device_ctx->device_id[7], device_ctx->device_id[6],
+//		device_ctx->device_id[8], device_ctx->device_id[9], device_ctx->device_id[10], device_ctx->device_id[11], device_ctx->device_id[12], device_ctx->device_id[13], device_ctx->device_id[14], device_ctx->device_id[15]);
+//}
+
+/*++
+
+Name:	vmbus_bus_init()
+
+Desc:	Main vmbus driver initialization routine. Here, we
+		- initialize the vmbus driver context
+		- setup various driver entry points
+		- invoke the vmbus hv main init routine
+		- get the irq resource
+		- invoke the vmbus to add the vmbus root device
+		- setup the vmbus root device
+		- retrieve the channel offers
+--*/
+int vmbus_bus_init(PFN_DRIVERINITIALIZE pfn_drv_init)
+{
+	int ret=0;
+	unsigned int vector=0;
+
+	struct vmbus_driver_context *vmbus_drv_ctx=&g_vmbus_drv;
+	VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
+
+	struct device_context *dev_ctx=&g_vmbus_drv.device_ctx;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	// Set this up to allow lower layer to callback to add/remove child devices on the bus
+	vmbus_drv_obj->OnChildDeviceCreate = vmbus_child_device_create;
+	vmbus_drv_obj->OnChildDeviceDestroy = vmbus_child_device_destroy;
+	vmbus_drv_obj->OnChildDeviceAdd = vmbus_child_device_register;
+	vmbus_drv_obj->OnChildDeviceRemove = vmbus_child_device_unregister;
+
+	// Call to bus driver to initialize
+	ret = pfn_drv_init(&vmbus_drv_obj->Base);
+	if (ret != 0)
+	{
+		DPRINT_ERR(VMBUS_DRV, "Unable to initialize vmbus (%d)", ret);
+		goto cleanup;
+	}
+
+	// Sanity checks
+	if (!vmbus_drv_obj->Base.OnDeviceAdd)
+	{
+		DPRINT_ERR(VMBUS_DRV, "OnDeviceAdd() routine not set");
+		ret = -1;
+		goto cleanup;
+	}
+
+	vmbus_drv_ctx->bus.name = vmbus_drv_obj->Base.name;
+
+	// Initialize the bus context
+	tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_msg_dpc, (unsigned long)vmbus_drv_obj);
+	tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_event_dpc, (unsigned long)vmbus_drv_obj);
+
+	// Now, register the bus driver with LDM
+	bus_register(&vmbus_drv_ctx->bus);
+
+	// Get the interrupt resource
+#ifdef KERNEL_2_6_27
+	ret = request_irq(vmbus_irq,
+			  vmbus_isr,
+			  IRQF_SAMPLE_RANDOM,
+			  vmbus_drv_obj->Base.name,
+			  NULL);
+#else
+	ret = request_irq(vmbus_irq,
+			  vmbus_isr,
+			  SA_SAMPLE_RANDOM,
+			  vmbus_drv_obj->Base.name,
+			  NULL);
+#endif
+
+	if (ret != 0)
+	{
+		DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d", vmbus_irq);
+
+		bus_unregister(&vmbus_drv_ctx->bus);
+
+		ret = -1;
+		goto cleanup;
+	}
+#ifdef KERNEL_2_6_27
+	vector = VMBUS_IRQ_VECTOR;
+#else
+#if X2V_LINUX
+	vector = vmbus_irq + FIRST_DEVICE_VECTOR - 2;
+#else
+	vector = vmbus_irq + FIRST_EXTERNAL_VECTOR;
+#endif
+#endif
+
+	DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
+
+	// Call to bus driver to add the root device
+	memset(dev_ctx, 0, sizeof(struct device_context));
+
+	ret = vmbus_drv_obj->Base.OnDeviceAdd(&dev_ctx->device_obj, &vector);
+	if (ret != 0)
+	{
+		DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to add vmbus root device");
+
+		free_irq(vmbus_irq, NULL);
+
+		bus_unregister(&vmbus_drv_ctx->bus);
+
+		ret = -1;
+		goto cleanup;
+	}
+	//strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name);
+	sprintf(dev_ctx->device.bus_id, "vmbus_0_0");
+	memcpy(&dev_ctx->class_id, &dev_ctx->device_obj.deviceType, sizeof(GUID));
+	memcpy(&dev_ctx->device_id, &dev_ctx->device_obj.deviceInstance, sizeof(GUID));
+
+	// No need to bind a driver to the root device.
+	dev_ctx->device.parent = NULL;
+	dev_ctx->device.bus = &vmbus_drv_ctx->bus; //NULL; // vmbus_remove() does not get invoked
+
+	// Setup the device dispatch table
+	dev_ctx->device.release = vmbus_bus_release;
+
+	// Setup the bus as root device
+	device_register(&dev_ctx->device);
+
+	vmbus_drv_obj->GetChannelOffers();
+
+cleanup:
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return ret;
+}
+
+
+/*++
+
+Name:	vmbus_bus_exit()
+
+Desc:	Terminate the vmbus driver. This routine is opposite of vmbus_bus_init()
+
+--*/
+void vmbus_bus_exit(void)
+{
+	VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
+	struct vmbus_driver_context *vmbus_drv_ctx=&g_vmbus_drv;
+
+	struct device_context *dev_ctx=&g_vmbus_drv.device_ctx;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	// Remove the root device
+	if (vmbus_drv_obj->Base.OnDeviceRemove)
+		vmbus_drv_obj->Base.OnDeviceRemove(&dev_ctx->device_obj);
+
+	if (vmbus_drv_obj->Base.OnCleanup)
+		vmbus_drv_obj->Base.OnCleanup(&vmbus_drv_obj->Base);
+
+	// Unregister the root bus device
+	device_unregister(&dev_ctx->device);
+
+	bus_unregister(&vmbus_drv_ctx->bus);
+
+	free_irq(vmbus_irq, NULL);
+
+	tasklet_kill(&vmbus_drv_ctx->msg_dpc);
+	tasklet_kill(&vmbus_drv_ctx->event_dpc);
+
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return;
+}
+
+/*++
+
+Name:	vmbus_child_driver_register()
+
+Desc:	Register a vmbus's child driver
+
+--*/
+void vmbus_child_driver_register(struct driver_context* driver_ctx)
+{
+	VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s", driver_ctx, driver_ctx->driver.name);
+
+	// The child driver on this vmbus
+	driver_ctx->driver.bus = &g_vmbus_drv.bus;
+
+	driver_register(&driver_ctx->driver);
+
+	vmbus_drv_obj->GetChannelOffers();
+
+	DPRINT_EXIT(VMBUS_DRV);
+}
+
+EXPORT_SYMBOL(vmbus_child_driver_register);
+
+/*++
+
+Name:	vmbus_child_driver_unregister()
+
+Desc:	Unregister a vmbus's child driver
+
+--*/
+void vmbus_child_driver_unregister(struct driver_context* driver_ctx)
+{
+	DPRINT_ENTER(VMBUS_DRV);
+
+	DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s", driver_ctx, driver_ctx->driver.name);
+
+	driver_unregister(&driver_ctx->driver);
+
+	driver_ctx->driver.bus = NULL;
+
+	DPRINT_EXIT(VMBUS_DRV);
+}
+
+EXPORT_SYMBOL(vmbus_child_driver_unregister);
+
+/*++
+
+Name:	vmbus_get_interface()
+
+Desc:	Get the vmbus channel interface. This is invoked by child/client driver that sits
+		above vmbus
+--*/
+void vmbus_get_interface(VMBUS_CHANNEL_INTERFACE *interface)
+{
+	VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
+
+	vmbus_drv_obj->GetChannelInterface(interface);
+}
+
+EXPORT_SYMBOL(vmbus_get_interface);
+
+
+/*++
+
+Name:	vmbus_child_device_get_info()
+
+Desc:	Get the vmbus child device info. This is invoked to display various device attributes in sysfs.
+--*/
+static void vmbus_child_device_get_info(DEVICE_OBJECT *device_obj, DEVICE_INFO *device_info)
+{
+	VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
+
+	vmbus_drv_obj->GetChannelInfo(device_obj, device_info);
+}
+
+
+/*++
+
+Name:	vmbus_child_device_create()
+
+Desc:	Creates and registers a new child device on the vmbus.
+
+--*/
+static DEVICE_OBJECT* vmbus_child_device_create(GUID type, GUID instance, void* context)
+{
+	struct device_context *child_device_ctx;
+	DEVICE_OBJECT* child_device_obj;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	// Allocate the new child device
+	child_device_ctx = kzalloc(sizeof(struct device_context), GFP_KERNEL);
+	if (!child_device_ctx)
+	{
+		DPRINT_ERR(VMBUS_DRV, "unable to allocate device_context for child device");
+		DPRINT_EXIT(VMBUS_DRV);
+
+		return NULL;
+	}
+
+	DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
+		"type {%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x},"
+		"id {%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
+		&child_device_ctx->device,
+		type.Data[3], type.Data[2], type.Data[1], type.Data[0], type.Data[5], type.Data[4], type.Data[7], type.Data[6], type.Data[8], type.Data[9], type.Data[10], type.Data[11], type.Data[12], type.Data[13], type.Data[14], type.Data[15],
+		instance.Data[3], instance.Data[2], instance.Data[1], instance.Data[0], instance.Data[5], instance.Data[4], instance.Data[7], instance.Data[6], instance.Data[8], instance.Data[9], instance.Data[10], instance.Data[11], instance.Data[12], instance.Data[13], instance.Data[14], instance.Data[15]);
+
+	child_device_obj = &child_device_ctx->device_obj;
+	child_device_obj->context = context;
+	memcpy(&child_device_obj->deviceType, &type, sizeof(GUID));
+	memcpy(&child_device_obj->deviceInstance, &instance, sizeof(GUID));
+
+	memcpy(&child_device_ctx->class_id, &type, sizeof(GUID));
+	memcpy(&child_device_ctx->device_id, &instance, sizeof(GUID));
+
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return child_device_obj;
+}
+
+/*++
+
+Name:	vmbus_child_device_register()
+
+Desc:	Register the child device on the specified bus
+
+--*/
+static int vmbus_child_device_register(DEVICE_OBJECT* root_device_obj, DEVICE_OBJECT* child_device_obj)
+{
+	int ret=0;
+	struct device_context *root_device_ctx = to_device_context(root_device_obj);
+	struct device_context *child_device_ctx = to_device_context(child_device_obj);
+	static int device_num=0;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	DPRINT_DBG(VMBUS_DRV, "child device (%p) registering", child_device_ctx);
+	//
+	// Make sure we are not registered already
+	//
+	if (child_device_ctx->device.bus_id[0] != '\0')
+	{
+		DPRINT_ERR(VMBUS_DRV, "child device (%p) already registered - busid %s", child_device_ctx, child_device_ctx->device.bus_id);
+
+		ret = -1;
+		goto Cleanup;
+	}
+
+	// Set the device bus id. Otherwise, device_register()will fail.
+	sprintf(child_device_ctx->device.bus_id, "vmbus_0_%d", InterlockedIncrement(&device_num));
+
+	// The new device belongs to this bus
+	child_device_ctx->device.bus = &g_vmbus_drv.bus; //device->dev.bus;
+	child_device_ctx->device.parent = &root_device_ctx->device;
+	child_device_ctx->device.release = vmbus_device_release;
+
+	// Register with the LDM. This will kick off the driver/device binding...which will
+	// eventually call vmbus_match() and vmbus_probe()
+	ret = device_register(&child_device_ctx->device);
+
+	// vmbus_probe() error does not get propergate to device_register().
+	ret = child_device_ctx->probe_error;
+
+	if (ret)
+		DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p) (%d)", &child_device_ctx->device);
+	else
+		DPRINT_INFO(VMBUS_DRV, "child device (%p) registered", &child_device_ctx->device);
+
+Cleanup:
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return ret;
+}
+
+/*++
+
+Name:	vmbus_child_device_unregister()
+
+Desc:	Remove the specified child device from the vmbus.
+
+--*/
+static void vmbus_child_device_unregister(DEVICE_OBJECT* device_obj)
+{
+	struct device_context *device_ctx = to_device_context(device_obj);
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)", &device_ctx->device);
+
+	// Kick off the process of unregistering the device.
+	// This will call vmbus_remove() and eventually vmbus_device_release()
+	device_unregister(&device_ctx->device);
+
+	DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered", &device_ctx->device);
+
+	DPRINT_EXIT(VMBUS_DRV);
+}
+
+
+/*++
+
+Name:	vmbus_child_device_destroy()
+
+Desc:	Destroy the specified child device on the vmbus.
+
+--*/
+static void vmbus_child_device_destroy(DEVICE_OBJECT* device_obj)
+{
+	DPRINT_ENTER(VMBUS_DRV);
+
+	DPRINT_EXIT(VMBUS_DRV);
+}
+
+/*++
+
+Name:	vmbus_uevent()
+
+Desc:	This routine is invoked when a device is added or removed on the vmbus to generate a uevent to udev in the
+		userspace. The udev will then look at its rule and the uevent generated here to load the appropriate driver
+
+--*/
+#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
+#elif defined(KERNEL_2_6_27)
+static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
+{
+	struct device_context *device_ctx = device_to_device_context(device);
+	int i=0;
+	int len=0;
+	int ret;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
+		device_ctx->class_id.Data[3], device_ctx->class_id.Data[2], device_ctx->class_id.Data[1], device_ctx->class_id.Data[0],
+		device_ctx->class_id.Data[5], device_ctx->class_id.Data[4],
+		device_ctx->class_id.Data[7], device_ctx->class_id.Data[6],
+		device_ctx->class_id.Data[8], device_ctx->class_id.Data[9], device_ctx->class_id.Data[10], device_ctx->class_id.Data[11],
+		device_ctx->class_id.Data[12], device_ctx->class_id.Data[13], device_ctx->class_id.Data[14], device_ctx->class_id.Data[15]);
+
+	env->envp_idx = i;
+	env->buflen = len;
+	ret = add_uevent_var(env,
+		"VMBUS_DEVICE_CLASS_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
+		device_ctx->class_id.Data[3], device_ctx->class_id.Data[2], device_ctx->class_id.Data[1], device_ctx->class_id.Data[0],
+		device_ctx->class_id.Data[5], device_ctx->class_id.Data[4],
+		device_ctx->class_id.Data[7], device_ctx->class_id.Data[6],
+		device_ctx->class_id.Data[8], device_ctx->class_id.Data[9], device_ctx->class_id.Data[10], device_ctx->class_id.Data[11],
+		device_ctx->class_id.Data[12], device_ctx->class_id.Data[13], device_ctx->class_id.Data[14], device_ctx->class_id.Data[15]);
+
+	if (ret)
+	{
+		return ret;
+	}
+
+	ret = add_uevent_var(env,
+		"VMBUS_DEVICE_DEVICE_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
+		device_ctx->device_id.Data[3], device_ctx->device_id.Data[2], device_ctx->device_id.Data[1], device_ctx->device_id.Data[0],
+		device_ctx->device_id.Data[5], device_ctx->device_id.Data[4],
+		device_ctx->device_id.Data[7], device_ctx->device_id.Data[6],
+		device_ctx->device_id.Data[8], device_ctx->device_id.Data[9], device_ctx->device_id.Data[10], device_ctx->device_id.Data[11],
+		device_ctx->device_id.Data[12], device_ctx->device_id.Data[13], device_ctx->device_id.Data[14], device_ctx->device_id.Data[15]);
+
+	if (ret)
+	{
+		return ret;
+	}
+
+	env->envp[env->envp_idx] = NULL;
+
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return 0;
+}
+
+#else
+static int vmbus_uevent(struct device *device, char **envp, int num_envp, char *buffer, int buffer_size)
+{
+	struct device_context *device_ctx = device_to_device_context(device);
+	int i=0;
+	int len=0;
+	int ret;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
+		device_ctx->class_id.Data[3], device_ctx->class_id.Data[2], device_ctx->class_id.Data[1], device_ctx->class_id.Data[0],
+		device_ctx->class_id.Data[5], device_ctx->class_id.Data[4],
+		device_ctx->class_id.Data[7], device_ctx->class_id.Data[6],
+		device_ctx->class_id.Data[8], device_ctx->class_id.Data[9], device_ctx->class_id.Data[10], device_ctx->class_id.Data[11],
+		device_ctx->class_id.Data[12], device_ctx->class_id.Data[13], device_ctx->class_id.Data[14], device_ctx->class_id.Data[15]);
+
+	ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
+		"VMBUS_DEVICE_CLASS_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
+		device_ctx->class_id.Data[3], device_ctx->class_id.Data[2], device_ctx->class_id.Data[1], device_ctx->class_id.Data[0],
+		device_ctx->class_id.Data[5], device_ctx->class_id.Data[4],
+		device_ctx->class_id.Data[7], device_ctx->class_id.Data[6],
+		device_ctx->class_id.Data[8], device_ctx->class_id.Data[9], device_ctx->class_id.Data[10], device_ctx->class_id.Data[11],
+		device_ctx->class_id.Data[12], device_ctx->class_id.Data[13], device_ctx->class_id.Data[14], device_ctx->class_id.Data[15]);
+
+	if (ret)
+	{
+		return ret;
+	}
+
+	ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
+		"VMBUS_DEVICE_DEVICE_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
+		device_ctx->device_id.Data[3], device_ctx->device_id.Data[2], device_ctx->device_id.Data[1], device_ctx->device_id.Data[0],
+		device_ctx->device_id.Data[5], device_ctx->device_id.Data[4],
+		device_ctx->device_id.Data[7], device_ctx->device_id.Data[6],
+		device_ctx->device_id.Data[8], device_ctx->device_id.Data[9], device_ctx->device_id.Data[10], device_ctx->device_id.Data[11],
+		device_ctx->device_id.Data[12], device_ctx->device_id.Data[13], device_ctx->device_id.Data[14], device_ctx->device_id.Data[15]);
+
+	if (ret)
+	{
+		return ret;
+	}
+
+	envp[i] = NULL;
+
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return 0;
+}
+#endif
+
+/*++
+
+Name:	vmbus_match()
+
+Desc:	Attempt to match the specified device to the specified driver
+
+--*/
+static int vmbus_match(struct device *device, struct device_driver *driver)
+{
+	int match=0;
+	struct driver_context *driver_ctx = driver_to_driver_context(driver);
+	struct device_context *device_ctx = device_to_device_context(device);
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	// We found our driver ?
+	if (memcmp(&device_ctx->class_id, &driver_ctx->class_id, sizeof(GUID)) == 0)
+	{
+		// !! NOTE: The driver_ctx is not a vmbus_drv_ctx. We typecast it here to access the
+		// DRIVER_OBJECT field
+		struct vmbus_driver_context *vmbus_drv_ctx = (struct vmbus_driver_context*)driver_ctx;
+		device_ctx->device_obj.Driver = &vmbus_drv_ctx->drv_obj.Base;
+		DPRINT_INFO(VMBUS_DRV, "device object (%p) set to driver object (%p)", &device_ctx->device_obj, device_ctx->device_obj.Driver);
+
+		match = 1;
+	}
+
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return match;
+}
+
+
+/*++
+
+Name:	vmbus_probe_failed_cb()
+
+Desc:	Callback when a driver probe failed in vmbus_probe(). We need a callback because
+		we cannot invoked device_unregister() inside vmbus_probe() since vmbus_probe() may be
+		invoked inside device_register() i.e. we cannot call device_unregister() inside
+		device_register()
+--*/
+#ifdef KERNEL_2_6_27
+static void vmbus_probe_failed_cb(struct work_struct *context)
+#else
+static void vmbus_probe_failed_cb(void* context)
+#endif
+{
+	struct device_context *device_ctx = (struct device_context*)context;
+
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	// Kick off the process of unregistering the device.
+	// This will call vmbus_remove() and eventually vmbus_device_release()
+	device_unregister(&device_ctx->device);
+
+	//put_device(&device_ctx->device);
+	DPRINT_EXIT(VMBUS_DRV);
+}
+
+
+/*++
+
+Name:	vmbus_probe()
+
+Desc:	Add the new vmbus's child device
+
+--*/
+static int vmbus_probe(struct device *child_device)
+{
+	int ret=0;
+	struct driver_context *driver_ctx = driver_to_driver_context(child_device->driver);
+	struct device_context *device_ctx = device_to_device_context(child_device);
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	// Let the specific open-source driver handles the probe if it can
+	if (driver_ctx->probe)
+	{
+		ret = device_ctx->probe_error = driver_ctx->probe(child_device);
+		if (ret != 0)
+		{
+			DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s (%p) on driver %s (%d)...", child_device->bus_id, child_device, child_device->driver->name, ret);
+
+#ifdef KERNEL_2_6_27
+			INIT_WORK(&device_ctx->probe_failed_work_item, vmbus_probe_failed_cb);
+#else
+			INIT_WORK(&device_ctx->probe_failed_work_item, vmbus_probe_failed_cb, device_ctx);
+#endif
+			schedule_work(&device_ctx->probe_failed_work_item);
+		}
+	}
+	else
+	{
+		DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s", child_device->driver->name);
+		ret = -1;
+	}
+
+	DPRINT_EXIT(VMBUS_DRV);
+	return ret;
+}
+
+
+/*++
+
+Name:	vmbus_remove()
+
+Desc:	Remove a vmbus device
+
+--*/
+static int vmbus_remove(struct device *child_device)
+{
+	int ret=0;
+	struct driver_context *driver_ctx;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	// Special case root bus device
+	if (child_device->parent == NULL)
+	{
+		// No-op since it is statically defined and handle in vmbus_bus_exit()
+		DPRINT_EXIT(VMBUS_DRV);
+		return 0;
+	}
+
+	if (child_device->driver)
+	{
+		driver_ctx = driver_to_driver_context(child_device->driver);
+
+		// Let the specific open-source driver handles the removal if it can
+		if (driver_ctx->remove)
+		{
+			ret = driver_ctx->remove(child_device);
+		}
+		else
+		{
+			DPRINT_ERR(VMBUS_DRV, "remove() method not set for driver - %s", child_device->driver->name);
+			ret = -1;
+		}
+	}
+	else
+	{
+
+	}
+
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return 0;
+}
+
+/*++
+
+Name:	vmbus_shutdown()
+
+Desc:	Shutdown a vmbus device
+
+--*/
+static void vmbus_shutdown(struct device *child_device)
+{
+	struct driver_context *driver_ctx;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	// Special case root bus device
+	if (child_device->parent == NULL)
+	{
+		// No-op since it is statically defined and handle in vmbus_bus_exit()
+		DPRINT_EXIT(VMBUS_DRV);
+		return;
+	}
+
+	// The device may not be attached yet
+	if (!child_device->driver)
+	{
+		DPRINT_EXIT(VMBUS_DRV);
+		return;
+	}
+
+	driver_ctx = driver_to_driver_context(child_device->driver);
+
+	// Let the specific open-source driver handles the removal if it can
+	if (driver_ctx->shutdown)
+	{
+		driver_ctx->shutdown(child_device);
+	}
+
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return;
+}
+
+/*++
+
+Name:	vmbus_bus_release()
+
+Desc:	Final callback release of the vmbus root device
+
+--*/
+static void vmbus_bus_release(struct device *device)
+{
+	DPRINT_ENTER(VMBUS_DRV);
+	DPRINT_EXIT(VMBUS_DRV);
+}
+
+/*++
+
+Name:	vmbus_device_release()
+
+Desc:	Final callback release of the vmbus child device
+
+--*/
+static void vmbus_device_release(struct device *device)
+{
+	struct device_context *device_ctx = device_to_device_context(device);
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	//vmbus_child_device_destroy(&device_ctx->device_obj);
+	kfree(device_ctx);
+
+	// !!DO NOT REFERENCE device_ctx anymore at this point!!
+
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return;
+}
+
+/*++
+
+Name:	vmbus_msg_dpc()
+
+Desc:	Tasklet routine to handle hypervisor messages
+
+--*/
+static void vmbus_msg_dpc(unsigned long data)
+{
+	VMBUS_DRIVER_OBJECT* vmbus_drv_obj = (VMBUS_DRIVER_OBJECT*)data;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	ASSERT(vmbus_drv_obj->OnMsgDpc != NULL);
+
+	// Call to bus driver to handle interrupt
+	vmbus_drv_obj->OnMsgDpc(&vmbus_drv_obj->Base);
+
+	DPRINT_EXIT(VMBUS_DRV);
+}
+
+/*++
+
+Name:	vmbus_msg_dpc()
+
+Desc:	Tasklet routine to handle hypervisor events
+
+--*/
+static void vmbus_event_dpc(unsigned long data)
+{
+	VMBUS_DRIVER_OBJECT* vmbus_drv_obj = (VMBUS_DRIVER_OBJECT*)data;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	ASSERT(vmbus_drv_obj->OnEventDpc != NULL);
+
+	// Call to bus driver to handle interrupt
+	vmbus_drv_obj->OnEventDpc(&vmbus_drv_obj->Base);
+
+	DPRINT_EXIT(VMBUS_DRV);
+}
+
+/*++
+
+Name:	vmbus_msg_dpc()
+
+Desc:	ISR routine
+
+--*/
+#ifdef KERNEL_2_6_27
+static irqreturn_t vmbus_isr(int irq, void* dev_id)
+#else
+static int vmbus_isr(int irq, void* dev_id, struct pt_regs *regs)
+#endif
+{
+	int ret=0;
+	VMBUS_DRIVER_OBJECT* vmbus_driver_obj = &g_vmbus_drv.drv_obj;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	ASSERT(vmbus_driver_obj->OnIsr != NULL);
+
+	// Call to bus driver to handle interrupt
+	ret = vmbus_driver_obj->OnIsr(&vmbus_driver_obj->Base);
+
+	// Schedules a dpc if necessary
+	if (ret > 0)
+	{
+		if (test_bit(0, (unsigned long*)&ret))
+		{
+			tasklet_schedule(&g_vmbus_drv.msg_dpc);
+		}
+
+		if (test_bit(1, (unsigned long*)&ret))
+		{
+			tasklet_schedule(&g_vmbus_drv.event_dpc);
+		}
+
+		DPRINT_EXIT(VMBUS_DRV);
+		return IRQ_HANDLED;
+	}
+	else
+	{
+		DPRINT_EXIT(VMBUS_DRV);
+		return IRQ_NONE;
+	}
+}
+
+MODULE_LICENSE("GPL");
+
+
+/*++
+
+Name:	vmbus_init()
+
+Desc:	Main vmbus driver entry routine
+
+--*/
+static int __init vmbus_init(void)
+{
+	int ret=0;
+
+	DPRINT_ENTER(VMBUS_DRV);
+
+	DPRINT_INFO(VMBUS_DRV,
+		"Vmbus initializing.... current log level 0x%x (%x,%x)",
+		vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
+#ifdef KERNEL_2_6_27
+//Todo: it is used for loglevel, to be ported to new kernel.
+#else
+	vmbus_ctl_table_hdr = register_sysctl_table(vmus_root_ctl_table, 0);
+	if (!vmbus_ctl_table_hdr)
+	{
+		DPRINT_EXIT(VMBUS_DRV);
+		return -ENOMEM;
+	}
+#endif
+
+	ret = vmbus_bus_init(VmbusInitialize);
+
+	DPRINT_EXIT(VMBUS_DRV);
+	return ret;
+}
+
+
+
+/*++
+
+Name:	vmbus_init()
+
+Desc:	Main vmbus driver exit routine
+
+--*/
+static void __exit vmbus_exit(void)
+{
+	DPRINT_ENTER(VMBUS_DRV);
+
+	vmbus_bus_exit();
+#ifdef KERNEL_2_6_27
+//Todo: it is used for loglevel, to be ported to new kernel.
+#else
+	unregister_sysctl_table(vmbus_ctl_table_hdr);
+#endif
+	DPRINT_EXIT(VMBUS_DRV);
+
+	return;
+}
+
+#if defined(KERNEL_2_6_5)
+#else
+module_param(vmbus_irq, int, S_IRUGO);
+module_param(vmbus_loglevel, int, S_IRUGO);
+#endif
+
+module_init(vmbus_init);
+module_exit(vmbus_exit);
+// eof