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* 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 <linux/pci.h>
#include <linux/dmi.h>
#include "osd.h"
#include "logging.h"
#include "vmbus.h"
/* FIXME! We need to do this dynamically for PIC and APIC system */
#define VMBUS_IRQ 0x5
#define VMBUS_IRQ_VECTOR IRQ5_VECTOR
/* Main vmbus driver data structure */
struct vmbus_driver_context {
/* !! These must be the first 2 fields !! */
/* FIXME, this is a bug */
/* The driver field is not used in here. Instead, the bus field is */
/* used to represent the driver */
struct driver_context drv_ctx;
struct vmbus_driver 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 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);
static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
static void vmbus_msg_dpc(unsigned long data);
static void vmbus_event_dpc(unsigned long data);
static irqreturn_t vmbus_isr(int irq, void *dev_id);
static void vmbus_device_release(struct device *device);
static void vmbus_bus_release(struct device *device);
static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
struct hv_guid *instance,
void *context);
static void vmbus_child_device_destroy(struct hv_device *device_obj);
static int vmbus_child_device_register(struct hv_device *root_device_obj,
struct hv_device *child_device_obj);
static void vmbus_child_device_unregister(struct hv_device *child_device_obj);
static void vmbus_child_device_get_info(struct hv_device *device_obj,
struct hv_device_info *device_info);
static ssize_t vmbus_show_device_attr(struct device *dev,
struct device_attribute *dev_attr,
char *buf);
unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
EXPORT_SYMBOL(vmbus_loglevel);
/* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
/* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
static int vmbus_irq = VMBUS_IRQ;
/* 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
};
/* The one and only one */
static struct vmbus_driver_context g_vmbus_drv = {
.bus.name = "vmbus",
.bus.match = vmbus_match,
.bus.shutdown = vmbus_shutdown,
.bus.remove = vmbus_remove,
.bus.probe = vmbus_probe,
.bus.uevent = vmbus_uevent,
.bus.dev_attrs = vmbus_device_attrs,
};
/**
* vmbus_show_device_attr - Show the device attribute in sysfs.
*
* This is invoked when user does a
* "cat /sys/bus/vmbus/devices/<busdevice>/<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);
struct hv_device_info device_info;
memset(&device_info, 0, sizeof(struct hv_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;
}
}
/**
* vmbus_bus_init -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
*/
static int vmbus_bus_init(int (*drv_init)(struct hv_driver *drv))
{
struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
struct device_context *dev_ctx = &g_vmbus_drv.device_ctx;
int ret;
unsigned int vector;
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 = 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 */
ret = bus_register(&vmbus_drv_ctx->bus);
if (ret) {
ret = -1;
goto cleanup;
}
/* Get the interrupt resource */
ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
vmbus_drv_obj->Base.name, NULL);
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;
}
vector = VMBUS_IRQ_VECTOR;
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); */
dev_set_name(&dev_ctx->device, "vmbus_0_0");
memcpy(&dev_ctx->class_id, &dev_ctx->device_obj.deviceType,
sizeof(struct hv_guid));
memcpy(&dev_ctx->device_id, &dev_ctx->device_obj.deviceInstance,
sizeof(struct hv_guid));
/* No need to bind a driver to the root device. */
dev_ctx->device.parent = NULL;
/* NULL; vmbus_remove() does not get invoked */
dev_ctx->device.bus = &vmbus_drv_ctx->bus;
/* Setup the device dispatch table */
dev_ctx->device.release = vmbus_bus_release;
/* Setup the bus as root device */
ret = device_register(&dev_ctx->device);
if (ret) {
DPRINT_ERR(VMBUS_DRV,
"ERROR - Unable to register vmbus root device");
free_irq(vmbus_irq, NULL);
bus_unregister(&vmbus_drv_ctx->bus);
ret = -1;
goto cleanup;
}
vmbus_drv_obj->GetChannelOffers();
cleanup:
DPRINT_EXIT(VMBUS_DRV);
return ret;
}
/**
* vmbus_bus_exit - Terminate the vmbus driver.
*
* This routine is opposite of vmbus_bus_init()
*/
static void vmbus_bus_exit(void)
{
struct vmbus_driver *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;
}
/**
* vmbus_child_driver_register - Register a vmbus's child driver
*/
int vmbus_child_driver_register(struct driver_context *driver_ctx)
{
struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
int ret;
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;
ret = driver_register(&driver_ctx->driver);
vmbus_drv_obj->GetChannelOffers();
DPRINT_EXIT(VMBUS_DRV);
return ret;
}
EXPORT_SYMBOL(vmbus_child_driver_register);
/**
* vmbus_child_driver_unregister 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);
/**
* vmbus_get_interface - Get the vmbus channel interface.
*
* This is invoked by child/client driver that sits above vmbus
*/
void vmbus_get_interface(struct vmbus_channel_interface *interface)
{
struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
vmbus_drv_obj->GetChannelInterface(interface);
}
EXPORT_SYMBOL(vmbus_get_interface);
/**
* vmbus_child_device_get_info - Get the vmbus child device info.
*
* This is invoked to display various device attributes in sysfs.
*/
static void vmbus_child_device_get_info(struct hv_device *device_obj,
struct hv_device_info *device_info)
{
struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
vmbus_drv_obj->GetChannelInfo(device_obj, device_info);
}
/**
* vmbus_child_device_create - Creates and registers a new child device on the vmbus.
*/
static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
struct hv_guid *instance,
void *context)
{
struct device_context *child_device_ctx;
struct hv_device *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(struct hv_guid));
memcpy(&child_device_obj->deviceInstance, instance,
sizeof(struct hv_guid));
memcpy(&child_device_ctx->class_id, type, sizeof(struct hv_guid));
memcpy(&child_device_ctx->device_id, instance, sizeof(struct hv_guid));
DPRINT_EXIT(VMBUS_DRV);
return child_device_obj;
}
/**
* vmbus_child_device_register - Register the child device on the specified bus
*/
static int vmbus_child_device_register(struct hv_device *root_device_obj,
struct hv_device *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 atomic_t device_num = ATOMIC_INIT(0);
DPRINT_ENTER(VMBUS_DRV);
DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
child_device_ctx);
/* Set the device name. Otherwise, device_register() will fail. */
dev_set_name(&child_device_ctx->device, "vmbus_0_%d",
atomic_inc_return(&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)",
&child_device_ctx->device);
else
DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
&child_device_ctx->device);
DPRINT_EXIT(VMBUS_DRV);
return ret;
}
/**
* vmbus_child_device_unregister - Remove the specified child device from the vmbus.
*/
static void vmbus_child_device_unregister(struct hv_device *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);
}
/**
* vmbus_child_device_destroy - Destroy the specified child device on the vmbus.
*/
static void vmbus_child_device_destroy(struct hv_device *device_obj)
{
DPRINT_ENTER(VMBUS_DRV);
DPRINT_EXIT(VMBUS_DRV);
}
/**
* vmbus_uevent - add uevent for our device
*
* 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
*/
static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
{
struct device_context *device_ctx = device_to_device_context(device);
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(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;
DPRINT_EXIT(VMBUS_DRV);
return 0;
}
/**
* vmbus_match - 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(struct hv_guid)) == 0) {
/*
* !! NOTE: The driver_ctx is not a vmbus_drv_ctx. We typecast
* it here to access the struct hv_driver 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;
}
/**
* vmbus_probe_failed_cb - 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()
*/
static void vmbus_probe_failed_cb(struct work_struct *context)
{
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);
}
/**
* vmbus_probe - 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)...",
dev_name(child_device), child_device,
child_device->driver->name, ret);
INIT_WORK(&device_ctx->probe_failed_work_item,
vmbus_probe_failed_cb);
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;
}
/**
* vmbus_remove - Remove a vmbus device
*/
static int vmbus_remove(struct device *child_device)
{
int ret;
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;
}
}
DPRINT_EXIT(VMBUS_DRV);
return 0;
}
/**
* vmbus_shutdown - 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;
}
/**
* vmbus_bus_release - Final callback release of the vmbus root device
*/
static void vmbus_bus_release(struct device *device)
{
DPRINT_ENTER(VMBUS_DRV);
/* FIXME */
/* Empty release functions are a bug, or a major sign
* of a problem design, this MUST BE FIXED! */
dev_err(device, "%s needs to be fixed!\n", __func__);
WARN_ON(1);
DPRINT_EXIT(VMBUS_DRV);
}
/**
* vmbus_device_release - 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;
}
/**
* vmbus_msg_dpc - Tasklet routine to handle hypervisor messages
*/
static void vmbus_msg_dpc(unsigned long data)
{
struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)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);
}
/**
* vmbus_msg_dpc - Tasklet routine to handle hypervisor events
*/
static void vmbus_event_dpc(unsigned long data)
{
struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)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);
}
static irqreturn_t vmbus_isr(int irq, void *dev_id)
{
struct vmbus_driver *vmbus_driver_obj = &g_vmbus_drv.drv_obj;
int ret;
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;
}
}
static struct dmi_system_id __initdata microsoft_hv_dmi_table[] = {
{
.ident = "Hyper-V",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
},
},
{ },
};
MODULE_DEVICE_TABLE(dmi, microsoft_hv_dmi_table);
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));
/* Todo: it is used for loglevel, to be ported to new kernel. */
if (!dmi_check_system(microsoft_hv_dmi_table))
return -ENODEV;
ret = vmbus_bus_init(VmbusInitialize);
DPRINT_EXIT(VMBUS_DRV);
return ret;
}
static void __exit vmbus_exit(void)
{
DPRINT_ENTER(VMBUS_DRV);
vmbus_bus_exit();
/* Todo: it is used for loglevel, to be ported to new kernel. */
DPRINT_EXIT(VMBUS_DRV);
return;
}
/*
* We use a PCI table to determine if we should autoload this driver This is
* needed by distro tools to determine if the hyperv drivers should be
* installed and/or configured. We don't do anything else with the table, but
* it needs to be present.
*/
const static struct pci_device_id microsoft_hv_pci_table[] = {
{ PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
{ 0 }
};
MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
MODULE_LICENSE("GPL");
module_param(vmbus_irq, int, S_IRUGO);
module_param(vmbus_loglevel, int, S_IRUGO);
module_init(vmbus_init);
module_exit(vmbus_exit);
|