diff options
Diffstat (limited to 'drivers/hv/vmbus_drv.c')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 772 |
1 files changed, 772 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c new file mode 100644 index 00000000000..b0d08f980de --- /dev/null +++ b/drivers/hv/vmbus_drv.c @@ -0,0 +1,772 @@ +/* + * 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> + * K. Y. Srinivasan <kys@microsoft.com> + * + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#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/slab.h> +#include <linux/acpi.h> +#include <acpi/acpi_bus.h> +#include <linux/completion.h> +#include <linux/hyperv.h> + +#include "hyperv_vmbus.h" + + +static struct acpi_device *hv_acpi_dev; + +static struct tasklet_struct msg_dpc; +static struct tasklet_struct event_dpc; + +unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL); +EXPORT_SYMBOL(vmbus_loglevel); + +static struct completion probe_event; +static int irq; + +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(uuid_le)); + memcpy(&info->chn_instance, &debug_info.interface_instance, + sizeof(uuid_le)); + + 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; +} + +#define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) +static void print_alias_name(struct hv_device *hv_dev, char *alias_name) +{ + int i; + for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) + sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); +} + +/* + * 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 *hv_dev = device_to_hv_device(dev); + struct hv_device_info *device_info; + char alias_name[VMBUS_ALIAS_LEN + 1]; + int ret = 0; + + device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); + if (!device_info) + return ret; + + get_channel_info(hv_dev, device_info); + + if (!strcmp(dev_attr->attr.name, "class_id")) { + ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" + "%02x%02x%02x%02x%02x%02x%02x%02x}\n", + device_info->chn_type.b[3], + device_info->chn_type.b[2], + device_info->chn_type.b[1], + device_info->chn_type.b[0], + device_info->chn_type.b[5], + device_info->chn_type.b[4], + device_info->chn_type.b[7], + device_info->chn_type.b[6], + device_info->chn_type.b[8], + device_info->chn_type.b[9], + device_info->chn_type.b[10], + device_info->chn_type.b[11], + device_info->chn_type.b[12], + device_info->chn_type.b[13], + device_info->chn_type.b[14], + device_info->chn_type.b[15]); + } else if (!strcmp(dev_attr->attr.name, "device_id")) { + ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" + "%02x%02x%02x%02x%02x%02x%02x%02x}\n", + device_info->chn_instance.b[3], + device_info->chn_instance.b[2], + device_info->chn_instance.b[1], + device_info->chn_instance.b[0], + device_info->chn_instance.b[5], + device_info->chn_instance.b[4], + device_info->chn_instance.b[7], + device_info->chn_instance.b[6], + device_info->chn_instance.b[8], + device_info->chn_instance.b[9], + device_info->chn_instance.b[10], + device_info->chn_instance.b[11], + device_info->chn_instance.b[12], + device_info->chn_instance.b[13], + device_info->chn_instance.b[14], + device_info->chn_instance.b[15]); + } else if (!strcmp(dev_attr->attr.name, "modalias")) { + print_alias_name(hv_dev, alias_name); + ret = sprintf(buf, "vmbus:%s\n", alias_name); + } else if (!strcmp(dev_attr->attr.name, "state")) { + ret = sprintf(buf, "%d\n", device_info->chn_state); + } else if (!strcmp(dev_attr->attr.name, "id")) { + ret = sprintf(buf, "%d\n", device_info->chn_id); + } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { + ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); + } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { + ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); + } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { + ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); + } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { + ret = sprintf(buf, "%d\n", + device_info->outbound.bytes_avail_toread); + } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { + ret = sprintf(buf, "%d\n", + device_info->outbound.bytes_avail_towrite); + } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { + ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); + } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { + ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); + } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { + ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); + } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { + ret = sprintf(buf, "%d\n", + device_info->inbound.bytes_avail_toread); + } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { + ret = sprintf(buf, "%d\n", + device_info->inbound.bytes_avail_towrite); + } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { + ret = sprintf(buf, "%d\n", device_info->monitor_id); + } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { + ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); + } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { + ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); + } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { + ret = sprintf(buf, "%d\n", + device_info->server_monitor_conn_id); + } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { + ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); + } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { + ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); + } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { + ret = sprintf(buf, "%d\n", + device_info->client_monitor_conn_id); + } + + kfree(device_info); + return ret; +} + +/* 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(modalias, 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 +}; + + +/* + * 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 + * + * The alias string will be of the form vmbus:guid where guid is the string + * representation of the device guid (each byte of the guid will be + * represented with two hex characters. + */ +static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) +{ + struct hv_device *dev = device_to_hv_device(device); + int ret; + char alias_name[VMBUS_ALIAS_LEN + 1]; + + print_alias_name(dev, alias_name); + ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); + return ret; +} + +static uuid_le null_guid; + +static inline bool is_null_guid(const __u8 *guid) +{ + if (memcmp(guid, &null_guid, sizeof(uuid_le))) + return false; + return true; +} + +/* + * Return a matching hv_vmbus_device_id pointer. + * If there is no match, return NULL. + */ +static const struct hv_vmbus_device_id *hv_vmbus_get_id( + const struct hv_vmbus_device_id *id, + __u8 *guid) +{ + for (; !is_null_guid(id->guid); id++) + if (!memcmp(&id->guid, guid, sizeof(uuid_le))) + return id; + + return NULL; +} + + + +/* + * vmbus_match - Attempt to match the specified device to the specified driver + */ +static int vmbus_match(struct device *device, struct device_driver *driver) +{ + struct hv_driver *drv = drv_to_hv_drv(driver); + struct hv_device *hv_dev = device_to_hv_device(device); + + if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) + return 1; + + return 0; +} + +/* + * 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); + const struct hv_vmbus_device_id *dev_id; + + dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); + if (drv->probe) { + ret = drv->probe(dev, dev_id); + if (ret != 0) + pr_err("probe failed for device %s (%d)\n", + dev_name(child_device), ret); + + } else { + pr_err("probe not set for driver %s\n", + dev_name(child_device)); + ret = -ENODEV; + } + return ret; +} + +/* + * vmbus_remove - Remove a vmbus device + */ +static int vmbus_remove(struct device *child_device) +{ + struct hv_driver *drv = drv_to_hv_drv(child_device->driver); + struct hv_device *dev = device_to_hv_device(child_device); + + if (drv->remove) + drv->remove(dev); + else + pr_err("remove not set for driver %s\n", + dev_name(child_device)); + + return 0; +} + + +/* + * vmbus_shutdown - Shutdown a vmbus device + */ +static void vmbus_shutdown(struct device *child_device) +{ + struct hv_driver *drv; + struct hv_device *dev = device_to_hv_device(child_device); + + + /* The device may not be attached yet */ + if (!child_device->driver) + return; + + drv = drv_to_hv_drv(child_device->driver); + + if (drv->shutdown) + drv->shutdown(dev); + + return; +} + + +/* + * vmbus_device_release - Final callback release of the vmbus child device + */ +static void vmbus_device_release(struct device *device) +{ + struct hv_device *hv_dev = device_to_hv_device(device); + + kfree(hv_dev); + +} + +/* The one and only one */ +static struct bus_type hv_bus = { + .name = "vmbus", + .match = vmbus_match, + .shutdown = vmbus_shutdown, + .remove = vmbus_remove, + .probe = vmbus_probe, + .uevent = vmbus_uevent, + .dev_attrs = vmbus_device_attrs, +}; + +static const char *driver_name = "hyperv"; + + +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); +} + +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 + */ + smp_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); + } + } +} + +static irqreturn_t vmbus_isr(int irq, void *dev_id) +{ + int cpu = smp_processor_id(); + void *page_addr; + struct hv_message *msg; + union hv_synic_event_flags *event; + bool handled = false; + + /* + * Check for events before checking for messages. This is the order + * in which events and messages are checked in Windows guests on + * Hyper-V, and the Windows team suggested we do the same. + */ + + 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 (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { + handled = true; + tasklet_schedule(&event_dpc); + } + + 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 processed */ + if (msg->header.message_type != HVMSG_NONE) { + handled = true; + tasklet_schedule(&msg_dpc); + } + + if (handled) + return IRQ_HANDLED; + else + return IRQ_NONE; +} + +/* + * vmbus_bus_init -Main vmbus driver initialization routine. + * + * Here, we + * - initialize the vmbus driver context + * - invoke the vmbus hv main init routine + * - get the irq resource + * - retrieve the channel offers + */ +static int vmbus_bus_init(int irq) +{ + int ret; + unsigned int vector; + + /* Hypervisor initialization...setup hypercall page..etc */ + ret = hv_init(); + if (ret != 0) { + pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); + return ret; + } + + tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); + tasklet_init(&event_dpc, vmbus_on_event, 0); + + ret = bus_register(&hv_bus); + if (ret) + goto err_cleanup; + + ret = request_irq(irq, vmbus_isr, IRQF_SAMPLE_RANDOM, + driver_name, hv_acpi_dev); + + if (ret != 0) { + pr_err("Unable to request IRQ %d\n", + irq); + goto err_unregister; + } + + vector = IRQ0_VECTOR + irq; + + /* + * Notify the hypervisor of our irq and + * connect to the host. + */ + on_each_cpu(hv_synic_init, (void *)&vector, 1); + ret = vmbus_connect(); + if (ret) + goto err_irq; + + vmbus_request_offers(); + + return 0; + +err_irq: + free_irq(irq, hv_acpi_dev); + +err_unregister: + bus_unregister(&hv_bus); + +err_cleanup: + hv_cleanup(); + + return ret; +} + +/** + * __vmbus_child_driver_register - Register a vmbus's driver + * @drv: Pointer to driver structure you want to register + * @owner: owner module of the drv + * @mod_name: module name string + * + * 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. + * + */ +int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) +{ + int ret; + + pr_info("registering driver %s\n", hv_driver->name); + + hv_driver->driver.name = hv_driver->name; + hv_driver->driver.owner = owner; + hv_driver->driver.mod_name = mod_name; + hv_driver->driver.bus = &hv_bus; + + ret = driver_register(&hv_driver->driver); + + vmbus_request_offers(); + + return ret; +} +EXPORT_SYMBOL_GPL(__vmbus_driver_register); + +/** + * vmbus_driver_unregister() - Unregister a vmbus's driver + * @drv: Pointer to driver structure you want to un-register + * + * Un-register the given driver that was previous registered with a call to + * vmbus_driver_register() + */ +void vmbus_driver_unregister(struct hv_driver *hv_driver) +{ + pr_info("unregistering driver %s\n", hv_driver->name); + + driver_unregister(&hv_driver->driver); + +} +EXPORT_SYMBOL_GPL(vmbus_driver_unregister); + +/* + * vmbus_device_create - Creates and registers a new child device + * on the vmbus. + */ +struct hv_device *vmbus_device_create(uuid_le *type, + uuid_le *instance, + struct vmbus_channel *channel) +{ + struct hv_device *child_device_obj; + + child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); + if (!child_device_obj) { + pr_err("Unable to allocate device object for child device\n"); + return NULL; + } + + child_device_obj->channel = channel; + memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); + memcpy(&child_device_obj->dev_instance, instance, + sizeof(uuid_le)); + + + return child_device_obj; +} + +/* + * vmbus_device_register - Register the child device + */ +int vmbus_device_register(struct hv_device *child_device_obj) +{ + int ret = 0; + + static atomic_t device_num = ATOMIC_INIT(0); + + dev_set_name(&child_device_obj->device, "vmbus_0_%d", + atomic_inc_return(&device_num)); + + child_device_obj->device.bus = &hv_bus; + child_device_obj->device.parent = &hv_acpi_dev->dev; + 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); + + if (ret) + pr_err("Unable to register child device\n"); + else + pr_info("child device %s registered\n", + dev_name(&child_device_obj->device)); + + return ret; +} + +/* + * vmbus_device_unregister - Remove the specified child device + * from the vmbus. + */ +void vmbus_device_unregister(struct hv_device *device_obj) +{ + /* + * Kick off the process of unregistering the device. + * This will call vmbus_remove() and eventually vmbus_device_release() + */ + device_unregister(&device_obj->device); + + pr_info("child device %s unregistered\n", + dev_name(&device_obj->device)); +} + + +/* + * VMBUS is an acpi enumerated device. Get the the IRQ information + * from DSDT. + */ + +static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) +{ + + if (res->type == ACPI_RESOURCE_TYPE_IRQ) { + struct acpi_resource_irq *irqp; + irqp = &res->data.irq; + + *((unsigned int *)irq) = irqp->interrupts[0]; + } + + return AE_OK; +} + +static int vmbus_acpi_add(struct acpi_device *device) +{ + acpi_status result; + + hv_acpi_dev = device; + + result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, + vmbus_walk_resources, &irq); + + if (ACPI_FAILURE(result)) { + complete(&probe_event); + return -ENODEV; + } + complete(&probe_event); + return 0; +} + +static const struct acpi_device_id vmbus_acpi_device_ids[] = { + {"VMBUS", 0}, + {"VMBus", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); + +static struct acpi_driver vmbus_acpi_driver = { + .name = "vmbus", + .ids = vmbus_acpi_device_ids, + .ops = { + .add = vmbus_acpi_add, + }, +}; + +static int __init hv_acpi_init(void) +{ + int ret, t; + + init_completion(&probe_event); + + /* + * Get irq resources first. + */ + + ret = acpi_bus_register_driver(&vmbus_acpi_driver); + + if (ret) + return ret; + + t = wait_for_completion_timeout(&probe_event, 5*HZ); + if (t == 0) { + ret = -ETIMEDOUT; + goto cleanup; + } + + if (irq <= 0) { + ret = -ENODEV; + goto cleanup; + } + + ret = vmbus_bus_init(irq); + if (ret) + goto cleanup; + + return 0; + +cleanup: + acpi_bus_unregister_driver(&vmbus_acpi_driver); + return ret; +} + + +MODULE_LICENSE("GPL"); +MODULE_VERSION(HV_DRV_VERSION); +module_param(vmbus_loglevel, int, S_IRUGO|S_IWUSR); + +module_init(hv_acpi_init); |