/* * 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 * Hank Janssen * K. Y. Srinivasan * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "hyperv_vmbus.h" static struct acpi_device *hv_acpi_dev; static struct tasklet_struct msg_dpc; static struct completion probe_event; static int irq; struct resource hyperv_mmio = { .name = "hyperv mmio", .flags = IORESOURCE_MEM, }; EXPORT_SYMBOL_GPL(hyperv_mmio); static int vmbus_exists(void) { if (hv_acpi_dev == NULL) return -ENODEV; return 0; } #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]); } static u8 channel_monitor_group(struct vmbus_channel *channel) { return (u8)channel->offermsg.monitorid / 32; } static u8 channel_monitor_offset(struct vmbus_channel *channel) { return (u8)channel->offermsg.monitorid % 32; } static u32 channel_pending(struct vmbus_channel *channel, struct hv_monitor_page *monitor_page) { u8 monitor_group = channel_monitor_group(channel); return monitor_page->trigger_group[monitor_group].pending; } static u32 channel_latency(struct vmbus_channel *channel, struct hv_monitor_page *monitor_page) { u8 monitor_group = channel_monitor_group(channel); u8 monitor_offset = channel_monitor_offset(channel); return monitor_page->latency[monitor_group][monitor_offset]; } static u32 channel_conn_id(struct vmbus_channel *channel, struct hv_monitor_page *monitor_page) { u8 monitor_group = channel_monitor_group(channel); u8 monitor_offset = channel_monitor_offset(channel); return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; } static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); } static DEVICE_ATTR_RO(id); static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", hv_dev->channel->state); } static DEVICE_ATTR_RO(state); static ssize_t monitor_id_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); } static DEVICE_ATTR_RO(monitor_id); static ssize_t class_id_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "{%pUl}\n", hv_dev->channel->offermsg.offer.if_type.b); } static DEVICE_ATTR_RO(class_id); static ssize_t device_id_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "{%pUl}\n", hv_dev->channel->offermsg.offer.if_instance.b); } static DEVICE_ATTR_RO(device_id); static ssize_t modalias_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); char alias_name[VMBUS_ALIAS_LEN + 1]; print_alias_name(hv_dev, alias_name); return sprintf(buf, "vmbus:%s\n", alias_name); } static DEVICE_ATTR_RO(modalias); static ssize_t server_monitor_pending_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", channel_pending(hv_dev->channel, vmbus_connection.monitor_pages[1])); } static DEVICE_ATTR_RO(server_monitor_pending); static ssize_t client_monitor_pending_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", channel_pending(hv_dev->channel, vmbus_connection.monitor_pages[1])); } static DEVICE_ATTR_RO(client_monitor_pending); static ssize_t server_monitor_latency_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", channel_latency(hv_dev->channel, vmbus_connection.monitor_pages[0])); } static DEVICE_ATTR_RO(server_monitor_latency); static ssize_t client_monitor_latency_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", channel_latency(hv_dev->channel, vmbus_connection.monitor_pages[1])); } static DEVICE_ATTR_RO(client_monitor_latency); static ssize_t server_monitor_conn_id_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", channel_conn_id(hv_dev->channel, vmbus_connection.monitor_pages[0])); } static DEVICE_ATTR_RO(server_monitor_conn_id); static ssize_t client_monitor_conn_id_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); if (!hv_dev->channel) return -ENODEV; return sprintf(buf, "%d\n", channel_conn_id(hv_dev->channel, vmbus_connection.monitor_pages[1])); } static DEVICE_ATTR_RO(client_monitor_conn_id); static ssize_t out_intr_mask_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info outbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); return sprintf(buf, "%d\n", outbound.current_interrupt_mask); } static DEVICE_ATTR_RO(out_intr_mask); static ssize_t out_read_index_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info outbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); return sprintf(buf, "%d\n", outbound.current_read_index); } static DEVICE_ATTR_RO(out_read_index); static ssize_t out_write_index_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info outbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); return sprintf(buf, "%d\n", outbound.current_write_index); } static DEVICE_ATTR_RO(out_write_index); static ssize_t out_read_bytes_avail_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info outbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); return sprintf(buf, "%d\n", outbound.bytes_avail_toread); } static DEVICE_ATTR_RO(out_read_bytes_avail); static ssize_t out_write_bytes_avail_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info outbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); } static DEVICE_ATTR_RO(out_write_bytes_avail); static ssize_t in_intr_mask_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info inbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); return sprintf(buf, "%d\n", inbound.current_interrupt_mask); } static DEVICE_ATTR_RO(in_intr_mask); static ssize_t in_read_index_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info inbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); return sprintf(buf, "%d\n", inbound.current_read_index); } static DEVICE_ATTR_RO(in_read_index); static ssize_t in_write_index_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info inbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); return sprintf(buf, "%d\n", inbound.current_write_index); } static DEVICE_ATTR_RO(in_write_index); static ssize_t in_read_bytes_avail_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info inbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); return sprintf(buf, "%d\n", inbound.bytes_avail_toread); } static DEVICE_ATTR_RO(in_read_bytes_avail); static ssize_t in_write_bytes_avail_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct hv_device *hv_dev = device_to_hv_device(dev); struct hv_ring_buffer_debug_info inbound; if (!hv_dev->channel) return -ENODEV; hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); } static DEVICE_ATTR_RO(in_write_bytes_avail); /* Set up per device attributes in /sys/bus/vmbus/devices/ */ static struct attribute *vmbus_attrs[] = { &dev_attr_id.attr, &dev_attr_state.attr, &dev_attr_monitor_id.attr, &dev_attr_class_id.attr, &dev_attr_device_id.attr, &dev_attr_modalias.attr, &dev_attr_server_monitor_pending.attr, &dev_attr_client_monitor_pending.attr, &dev_attr_server_monitor_latency.attr, &dev_attr_client_monitor_latency.attr, &dev_attr_server_monitor_conn_id.attr, &dev_attr_client_monitor_conn_id.attr, &dev_attr_out_intr_mask.attr, &dev_attr_out_read_index.attr, &dev_attr_out_write_index.attr, &dev_attr_out_read_bytes_avail.attr, &dev_attr_out_write_bytes_avail.attr, &dev_attr_in_intr_mask.attr, &dev_attr_in_read_index.attr, &dev_attr_in_write_index.attr, &dev_attr_in_read_bytes_avail.attr, &dev_attr_in_write_bytes_avail.attr, NULL, }; ATTRIBUTE_GROUPS(vmbus); /* * 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 const 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, const __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_groups = vmbus_groups, }; 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 hv_process_timer_expiration(struct hv_message *msg, int cpu) { struct clock_event_device *dev = hv_context.clk_evt[cpu]; if (dev->event_handler) dev->event_handler(dev); 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); } } 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); } } } static void vmbus_isr(void) { int cpu = smp_processor_id(); void *page_addr; struct hv_message *msg; union hv_synic_event_flags *event; bool handled = false; page_addr = hv_context.synic_event_page[cpu]; if (page_addr == NULL) return; event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; /* * 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. */ if ((vmbus_proto_version == VERSION_WS2008) || (vmbus_proto_version == VERSION_WIN7)) { /* 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; } } else { /* * Our host is win8 or above. The signaling mechanism * has changed and we can directly look at the event page. * If bit n is set then we have an interrup on the channel * whose id is n. */ handled = true; } if (handled) tasklet_schedule(hv_context.event_dpc[cpu]); 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) { if (msg->header.message_type == HVMSG_TIMER_EXPIRED) hv_process_timer_expiration(msg, cpu); else tasklet_schedule(&msg_dpc); } } /* * 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; /* 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); ret = bus_register(&hv_bus); if (ret) goto err_cleanup; hv_setup_vmbus_irq(vmbus_isr); ret = hv_synic_alloc(); if (ret) goto err_alloc; /* * Initialize the per-cpu interrupt state and * connect to the host. */ on_each_cpu(hv_synic_init, NULL, 1); ret = vmbus_connect(); if (ret) goto err_alloc; vmbus_request_offers(); return 0; err_alloc: hv_synic_free(); hv_remove_vmbus_irq(); 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); ret = vmbus_exists(); if (ret < 0) return ret; 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); 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); if (!vmbus_exists()) 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(const uuid_le *type, const 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_debug("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) { pr_debug("child device %s unregistered\n", dev_name(&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); } /* * VMBUS is an acpi enumerated device. Get the the information we * need from DSDT. */ static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) { switch (res->type) { case ACPI_RESOURCE_TYPE_IRQ: irq = res->data.irq.interrupts[0]; break; case ACPI_RESOURCE_TYPE_ADDRESS64: hyperv_mmio.start = res->data.address64.address.minimum; hyperv_mmio.end = res->data.address64.address.maximum; break; } return AE_OK; } static int vmbus_acpi_add(struct acpi_device *device) { acpi_status result; int ret_val = -ENODEV; hv_acpi_dev = device; result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, vmbus_walk_resources, NULL); if (ACPI_FAILURE(result)) goto acpi_walk_err; /* * The parent of the vmbus acpi device (Gen2 firmware) is the VMOD that * has the mmio ranges. Get that. */ if (device->parent) { result = acpi_walk_resources(device->parent->handle, METHOD_NAME__CRS, vmbus_walk_resources, NULL); if (ACPI_FAILURE(result)) goto acpi_walk_err; if (hyperv_mmio.start && hyperv_mmio.end) request_resource(&iomem_resource, &hyperv_mmio); } ret_val = 0; acpi_walk_err: complete(&probe_event); return ret_val; } 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; if (x86_hyper != &x86_hyper_ms_hyperv) return -ENODEV; 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); hv_acpi_dev = NULL; return ret; } static void __exit vmbus_exit(void) { hv_remove_vmbus_irq(); vmbus_free_channels(); bus_unregister(&hv_bus); hv_cleanup(); acpi_bus_unregister_driver(&vmbus_acpi_driver); } MODULE_LICENSE("GPL"); subsys_initcall(hv_acpi_init); module_exit(vmbus_exit);