| /* |
| * 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 "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; |
| } |
| |
| /* |
| * 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; |
| |
| memset(&device_info, 0, sizeof(struct hv_device_info)); |
| |
| get_channel_info(hv_dev, &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.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")) { |
| return 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, "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; |
| } |
| } |
| |
| /* 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 |
| }; |
| |
| |
| /* |
| * 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 i, ret; |
| char alias_name[((sizeof((struct hv_vmbus_device_id *)0)->guid) + 1) * 2]; |
| |
| for (i = 0; i < ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2); i += 2) |
| sprintf(&alias_name[i], "%02x", dev->dev_type.b[i/2]); |
| |
| 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; |
| } |
| |
| |
| /* |
| * 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); |
| const struct hv_vmbus_device_id *id_array = drv->id_table; |
| |
| for (; !is_null_guid(id_array->guid); id_array++) |
| if (!memcmp(&id_array->guid, &hv_dev->dev_type.b, |
| sizeof(uuid_le))) |
| 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); |
| |
| if (drv->probe) { |
| ret = drv->probe(dev); |
| 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) |
| { |
| int ret; |
| struct hv_driver *drv; |
| |
| struct hv_device *dev = device_to_hv_device(child_device); |
| |
| if (child_device->driver) { |
| drv = drv_to_hv_drv(child_device->driver); |
| |
| if (drv->remove) { |
| ret = drv->remove(dev); |
| } else { |
| pr_err("remove not set for driver %s\n", |
| dev_name(child_device)); |
| ret = -ENODEV; |
| } |
| } |
| |
| 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_child_device_create - Creates and registers a new child device |
| * on the vmbus. |
| */ |
| struct hv_device *vmbus_child_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_child_device_register - Register the child device |
| */ |
| int vmbus_child_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_child_device_unregister - Remove the specified child device |
| * from the vmbus. |
| */ |
| void vmbus_child_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); |