/*
* 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 <linux/slab.h>
#include <linux/completion.h>
#include "version_info.h"
#include "hv_api.h"
#include "logging.h"
#include "vmbus.h"
#include "channel.h"
#include "vmbus_private.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 {
struct bus_type bus;
struct tasklet_struct msg_dpc;
struct tasklet_struct event_dpc;
/* The bus root device */
struct hv_device 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 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 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 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,
};
static const char *driver_name = "hyperv";
/*
* Windows vmbus does not defined this.
* We defined this to be consistent with other devices
*/
/* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */
static const struct hv_guid device_type = {
.data = {
0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d,
0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85
}
};
/* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */
static const struct hv_guid device_id = {
.data = {
0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40,
0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5
}
};
static struct hv_device *vmbus_device; /* vmbus root device */
/*
* vmbus_child_dev_add - Registers the child device with the vmbus
*/
int vmbus_child_dev_add(struct hv_device *child_dev)
{
return vmbus_child_device_register(vmbus_device, child_dev);
}
/*
* vmbus_dev_add - Callback when the root bus device is added
*/
static int vmbus_dev_add(struct hv_device *dev, void *info)
{
u32 *irqvector = info;
int ret;
vmbus_device = dev;
memcpy(&vmbus_device->dev_type, &device_type, sizeof(struct hv_guid));
memcpy(&vmbus_device->dev_instance, &device_id,
sizeof(struct hv_guid));
/* strcpy(dev->name, "vmbus"); */
/* SynIC setup... */
on_each_cpu(hv_synic_init, (void *)irqvector, 1);
/* Connect to VMBus in the root partition */
ret = vmbus_connect();
/* VmbusSendEvent(device->localPortId+1); */
return ret;
}
struct onmessage_work_context {
struct work_struct work;
struct hv_message msg;
};
static void vmbus_onmessage_work(struct work_struct *work)
{
struct onmessage_work_context *ctx;
ctx = container_of(work, struct onmessage_work_context,
work);
vmbus_onmessage(&ctx->msg);
kfree(ctx);
}
/*
* vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior
*/
static void vmbus_on_msg_dpc(unsigned long data)
{
int cpu = smp_processor_id();
void *page_addr = hv_context.synic_message_page[cpu];
struct hv_message *msg = (struct hv_message *)page_addr +
VMBUS_MESSAGE_SINT;
struct onmessage_work_context *ctx;
while (1) {
if (msg->header.message_type == HVMSG_NONE) {
/* no msg */
break;
} else {
ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
if (ctx == NULL)
continue;
INIT_WORK(&ctx->work, vmbus_onmessage_work);
memcpy(&ctx->msg, msg, sizeof(*msg));
queue_work(vmbus_connection.work_queue, &ctx->work);
}
msg->header.message_type = HVMSG_NONE;
/*
* Make sure the write to MessageType (ie set to
* HVMSG_NONE) happens before we read the
* MessagePending and EOMing. Otherwise, the EOMing
* will not deliver any more messages since there is
* no empty slot
*/
mb();
if (msg->header.message_flags.msg_pending) {
/*
* This will cause message queue rescan to
* possibly deliver another msg from the
* hypervisor
*/
wrmsrl(HV_X64_MSR_EOM, 0);
}
}
}
/*
* vmbus_on_isr - ISR routine
*/
static int vmbus_on_isr(void)
{
int ret = 0;
int cpu = smp_processor_id();
void *page_addr;
struct hv_message *msg;
union hv_synic_event_flags *event;
page_addr = hv_context.synic_message_page[cpu];
msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
/* Check if there are actual msgs to be process */
if (msg->header.message_type != HVMSG_NONE) {
DPRINT_DBG(VMBUS, "received msg type %d size %d",
msg->header.message_type,
msg->header.payload_size);
ret |= 0x1;
}
/* TODO: Check if there are events to be process */
page_addr = hv_context.synic_event_page[cpu];
event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
/* Since we are a child, we only need to check bit 0 */
if (test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) {
DPRINT_DBG(VMBUS, "received event %d", event->flags32[0]);
ret |= 0x2;
}
return ret;
}
static void get_channel_info(struct hv_device *device,
struct hv_device_info *info)
{
struct vmbus_channel_debug_info debug_info;
if (!device->channel)
return;
vmbus_get_debug_info(device->channel, &debug_info);
info->chn_id = debug_info.relid;
info->chn_state = debug_info.state;
memcpy(&info->chn_type, &debug_info.interfacetype,
sizeof(struct hv_guid));
memcpy(&info->chn_instance, &debug_info.interface_instance,
sizeof(struct hv_guid));
info->monitor_id = debug_info.monitorid;
info->server_monitor_pending = debug_info.servermonitor_pending;
info->server_monitor_latency = debug_info.servermonitor_latency;
info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
info->client_monitor_pending = debug_info.clientmonitor_pending;
info->client_monitor_latency = debug_info.clientmonitor_latency;
info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
info->inbound.read_idx = debug_info.inbound.current_read_index;
info->inbound.write_idx = debug_info.inbound.current_write_index;
info->inbound.bytes_avail_toread =
debug_info.inbound.bytes_avail_toread;
info->inbound.bytes_avail_towrite =
debug_info.inbound.bytes_avail_towrite;
info->outbound.int_mask =
debug_info.outbound.current_interrupt_mask;
info->outbound.read_idx = debug_info.outbound.current_read_index;
info->outbound.write_idx = debug_info.outbound.current_write_index;
info->outbound.bytes_avail_toread =
debug_info.outbound.bytes_avail_toread;
info->outbound.bytes_avail_towrite =
debug_info.outbound.bytes_avail_towrite;
}
/*
* 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 hv_device *device_ctx = device_to_hv_device(dev);
struct hv_device_info device_info;
memset(&device_info, 0, sizeof(struct hv_device_info));
get_channel_info(device_ctx, &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.chn_type.data[3],
device_info.chn_type.data[2],
device_info.chn_type.data[1],
device_info.chn_type.data[0],
device_info.chn_type.data[5],
device_info.chn_type.data[4],
device_info.chn_type.data[7],
device_info.chn_type.data[6],
device_info.chn_type.data[8],
device_info.chn_type.data[9],
device_info.chn_type.data[10],
device_info.chn_type.data[11],
device_info.chn_type.data[12],
device_info.chn_type.data[13],
device_info.chn_type.data[14],
device_info.chn_type.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.chn_instance.data[3],
device_info.chn_instance.data[2],
device_info.chn_instance.data[1],
device_info.chn_instance.data[0],
device_info.chn_instance.data[5],
device_info.chn_instance.data[4],
device_info.chn_instance.data[7],
device_info.chn_instance.data[6],
device_info.chn_instance.data[8],
device_info.chn_instance.data[9],
device_info.chn_instance.data[10],
device_info.chn_instance.data[11],
device_info.chn_instance.data[12],
device_info.chn_instance.data[13],
device_info.chn_instance.data[14],
device_info.chn_instance.data[15]);
} else if (!strcmp(dev_attr->attr.name, "state")) {
return sprintf(buf, "%d\n", device_info.chn_state);
} else if (!strcmp(dev_attr->attr.name, "id")) {
return sprintf(buf, "%d\n", device_info.chn_id);
} else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
return sprintf(buf, "%d\n", device_info.outbound.int_mask);
} else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
return sprintf(buf, "%d\n", device_info.outbound.read_idx);
} else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
return sprintf(buf, "%d\n", device_info.outbound.write_idx);
} else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
return sprintf(buf, "%d\n",
device_info.outbound.bytes_avail_toread);
} else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
return sprintf(buf, "%d\n",
device_info.outbound.bytes_avail_towrite);
} else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
return sprintf(buf, "%d\n", device_info.inbound.int_mask);
} else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
return sprintf(buf, "%d\n", device_info.inbound.read_idx);
} else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
return sprintf(buf, "%d\n", device_info.inbound.write_idx);
} else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
return sprintf(buf, "%d\n",
device_info.inbound.bytes_avail_toread);
} else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
return sprintf(buf, "%d\n",
device_info.inbound.bytes_avail_towrite);
} else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
return sprintf(buf, "%d\n", device_info.monitor_id);
} else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
return sprintf(buf, "%d\n", device_info.server_monitor_pending);
} else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
return sprintf(buf, "%d\n", device_info.server_monitor_latency);
} else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
return sprintf(buf, "%d\n",
device_info.server_monitor_conn_id);
} else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
return sprintf(buf, "%d\n", device_info.client_monitor_pending);
} else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
return sprintf(buf, "%d\n", device_info.client_monitor_latency);
} else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
return sprintf(buf, "%d\n",
device_info.client_monitor_conn_id);
} 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(void)
{
struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
int ret;
unsigned int vector;
DPRINT_INFO(VMBUS, "+++++++ HV Driver version = %s +++++++",
HV_DRV_VERSION);
DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++",
VMBUS_REVISION_NUMBER);
DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++",
VMBUS_MESSAGE_SINT);
DPRINT_DBG(VMBUS, "sizeof(vmbus_channel_packet_page_buffer)=%zd, "
"sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
sizeof(struct vmbus_channel_packet_page_buffer),
sizeof(struct vmbus_channel_packet_multipage_buffer));
/* Hypervisor initialization...setup hypercall page..etc */
ret = hv_init();
if (ret != 0) {
DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x",
ret);
goto cleanup;
}
vmbus_drv_ctx->bus.name = driver_name;
/* Initialize the bus context */
tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_on_msg_dpc,
(unsigned long)NULL);
tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_on_event,
(unsigned long)NULL);
/* Now, register the bus 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,
driver_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);
/* Add the root device */
memset(dev_ctx, 0, sizeof(struct hv_device));
ret = vmbus_dev_add(dev_ctx, &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");
/* 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;
/* register the 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_request_offers();
wait_for_completion(&hv_channel_ready);
cleanup:
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_context *vmbus_drv_ctx = &vmbus_drv;
struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
vmbus_release_unattached_channels();
vmbus_disconnect();
on_each_cpu(hv_synic_cleanup, NULL, 1);
hv_cleanup();
/* 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);
}
/**
* vmbus_child_driver_register() - Register a vmbus's child driver
* @drv: Pointer to driver structure you want to register
*
*
* Registers the given driver with Linux through the 'driver_register()' call
* And sets up the hyper-v vmbus handling for this driver.
* It will return the state of the 'driver_register()' call.
*
* Mainly used by Hyper-V drivers.
*/
int vmbus_child_driver_register(struct device_driver *drv)
{
int ret;
DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
drv, drv->name);
/* The child driver on this vmbus */
drv->bus = &vmbus_drv.bus;
ret = driver_register(drv);
vmbus_request_offers();
return ret;
}
EXPORT_SYMBOL(vmbus_child_driver_register);
/**
* vmbus_child_driver_unregister() - Unregister a vmbus's child driver
* @drv: Pointer to driver structure you want to un-register
*
*
* Un-register the given driver with Linux through the 'driver_unregister()'
* call. And ungegisters the driver from the Hyper-V vmbus handler.
*
* Mainly used by Hyper-V drivers.
*/
void vmbus_child_driver_unregister(struct device_driver *drv)
{
DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
drv, drv->name);
driver_unregister(drv);
drv->bus = NULL;
}
EXPORT_SYMBOL(vmbus_child_driver_unregister);
/*
* vmbus_child_device_create - Creates and registers a new child device
* on the vmbus.
*/
struct hv_device *vmbus_child_device_create(struct hv_guid *type,
struct hv_guid *instance,
struct vmbus_channel *channel)
{
struct hv_device *child_device_obj;
/* Allocate the new child device */
child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
if (!child_device_obj) {
DPRINT_ERR(VMBUS_DRV,
"unable to allocate device_context for child device");
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_obj->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->channel = channel;
memcpy(&child_device_obj->dev_type, type, sizeof(struct hv_guid));
memcpy(&child_device_obj->dev_instance, instance,
sizeof(struct hv_guid));
return child_device_obj;
}
/*
* vmbus_child_device_register - Register the child device on the specified bus
*/
int vmbus_child_device_register(struct hv_device *root_device_obj,
struct hv_device *child_device_obj)
{
int ret = 0;
static atomic_t device_num = ATOMIC_INIT(0);
DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
child_device_obj);
/* Set the device name. Otherwise, device_register() will fail. */
dev_set_name(&child_device_obj->device, "vmbus_0_%d",
atomic_inc_return(&device_num));
/* The new device belongs to this bus */
child_device_obj->device.bus = &vmbus_drv.bus; /* device->dev.bus; */
child_device_obj->device.parent = &root_device_obj->device;
child_device_obj->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_obj->device);
/* vmbus_probe() error does not get propergate to device_register(). */
ret = child_device_obj->probe_error;
if (ret)
DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
&child_device_obj->device);
else
DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
&child_device_obj->device);
return ret;
}
/*
* vmbus_child_device_unregister - Remove the specified child device
* from the vmbus.
*/
void vmbus_child_device_unregister(struct hv_device *device_obj)
{
DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
&device_obj->device);
/*
* Kick off the process of unregistering the device.
* This will call vmbus_remove() and eventually vmbus_device_release()
*/
device_unregister(&device_obj->device);
DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
&device_obj->device);
}
/*
* 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 hv_device *dev = device_to_hv_device(device);
int ret;
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}",
dev->dev_type.data[3], dev->dev_type.data[2],
dev->dev_type.data[1], dev->dev_type.data[0],
dev->dev_type.data[5], dev->dev_type.data[4],
dev->dev_type.data[7], dev->dev_type.data[6],
dev->dev_type.data[8], dev->dev_type.data[9],
dev->dev_type.data[10],
dev->dev_type.data[11],
dev->dev_type.data[12],
dev->dev_type.data[13],
dev->dev_type.data[14],
dev->dev_type.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}",
dev->dev_type.data[3],
dev->dev_type.data[2],
dev->dev_type.data[1],
dev->dev_type.data[0],
dev->dev_type.data[5],
dev->dev_type.data[4],
dev->dev_type.data[7],
dev->dev_type.data[6],
dev->dev_type.data[8],
dev->dev_type.data[9],
dev->dev_type.data[10],
dev->dev_type.data[11],
dev->dev_type.data[12],
dev->dev_type.data[13],
dev->dev_type.data[14],
dev->dev_type.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}",
dev->dev_instance.data[3],
dev->dev_instance.data[2],
dev->dev_instance.data[1],
dev->dev_instance.data[0],
dev->dev_instance.data[5],
dev->dev_instance.data[4],
dev->dev_instance.data[7],
dev->dev_instance.data[6],
dev->dev_instance.data[8],
dev->dev_instance.data[9],
dev->dev_instance.data[10],
dev->dev_instance.data[11],
dev->dev_instance.data[12],
dev->dev_instance.data[13],
dev->dev_instance.data[14],
dev->dev_instance.data[15]);
if (ret)
return ret;
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 hv_driver *drv = drv_to_hv_drv(driver);
struct hv_device *device_ctx = device_to_hv_device(device);
/* We found our driver ? */
if (memcmp(&device_ctx->dev_type, &drv->dev_type,
sizeof(struct hv_guid)) == 0) {
device_ctx->drv = drv->priv;
DPRINT_INFO(VMBUS_DRV,
"device object (%p) set to driver object (%p)",
&device_ctx,
device_ctx->drv);
match = 1;
}
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 hv_device *device_ctx = (struct hv_device *)context;
/*
* 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); */
}
/*
* vmbus_probe - Add the new vmbus's child device
*/
static int vmbus_probe(struct device *child_device)
{
int ret = 0;
struct hv_driver *drv =
drv_to_hv_drv(child_device->driver);
struct hv_device *dev = device_to_hv_device(child_device);
/* Let the specific open-source driver handles the probe if it can */
if (drv->driver.probe) {
ret = dev->probe_error =
drv->driver.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(&dev->probe_failed_work_item,
vmbus_probe_failed_cb);
schedule_work(&dev->probe_failed_work_item);
}
} else {
DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
child_device->driver->name);
ret = -1;
}
return ret;
}
/*
* vmbus_remove - Remove a vmbus device
*/
static int vmbus_remove(struct device *child_device)
{
int ret;
struct hv_driver *drv;
/* Special case root bus device */
if (child_device->parent == NULL) {
/*
* No-op since it is statically defined and handle in
* vmbus_bus_exit()
*/
return 0;
}
if (child_device->driver) {
drv = drv_to_hv_drv(child_device->driver);
/*
* Let the specific open-source driver handles the removal if
* it can
*/
if (drv->driver.remove) {
ret = drv->driver.remove(child_device);
} else {
DPRINT_ERR(VMBUS_DRV,
"remove() method not set for driver - %s",
child_device->driver->name);
ret = -1;
}
}
return 0;
}
/*
* vmbus_shutdown - Shutdown a vmbus device
*/
static void vmbus_shutdown(struct device *child_device)
{
struct hv_driver *drv;
/* Special case root bus device */
if (child_device->parent == NULL) {
/*
* No-op since it is statically defined and handle in
* vmbus_bus_exit()
*/
return;
}
/* The device may not be attached yet */
if (!child_device->driver)
return;
drv = drv_to_hv_drv(child_device->driver);
/* Let the specific open-source driver handles the removal if it can */
if (drv->driver.shutdown)
drv->driver.shutdown(child_device);
return;
}
/*
* vmbus_bus_release - Final callback release of the vmbus root device
*/
static void vmbus_bus_release(struct device *device)
{
/* 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);
}
/*
* vmbus_device_release - Final callback release of the vmbus child device
*/
static void vmbus_device_release(struct device *device)
{
struct hv_device *device_ctx = device_to_hv_device(device);
kfree(device_ctx);
/* !!DO NOT REFERENCE device_ctx anymore at this point!! */
}
static irqreturn_t vmbus_isr(int irq, void *dev_id)
{
int ret;
ret = vmbus_on_isr();
/* Schedules a dpc if necessary */
if (ret > 0) {
if (test_bit(0, (unsigned long *)&ret))
tasklet_schedule(&vmbus_drv.msg_dpc);
if (test_bit(1, (unsigned long *)&ret))
tasklet_schedule(&vmbus_drv.event_dpc);
return IRQ_HANDLED;
} else {
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)
{
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;
return vmbus_bus_init();
}
static void __exit vmbus_exit(void)
{
vmbus_bus_exit();
/* Todo: it is used for loglevel, to be ported to new kernel. */
}
/*
* 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.
*/
static const 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_VERSION(HV_DRV_VERSION);
module_param(vmbus_irq, int, S_IRUGO);
module_param(vmbus_loglevel, int, S_IRUGO);
module_init(vmbus_init);
module_exit(vmbus_exit);
