787 lines
21 KiB
C
787 lines
21 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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* K. Y. Srinivasan <kys@microsoft.com>
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/sysctl.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <linux/completion.h>
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#include <linux/hyperv.h>
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#include <asm/hyperv.h>
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#include "hyperv_vmbus.h"
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static struct acpi_device *hv_acpi_dev;
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static struct tasklet_struct msg_dpc;
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static struct tasklet_struct event_dpc;
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static struct completion probe_event;
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static int irq;
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struct hv_device_info {
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u32 chn_id;
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u32 chn_state;
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uuid_le chn_type;
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uuid_le chn_instance;
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u32 monitor_id;
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u32 server_monitor_pending;
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u32 server_monitor_latency;
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u32 server_monitor_conn_id;
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u32 client_monitor_pending;
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u32 client_monitor_latency;
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u32 client_monitor_conn_id;
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struct hv_dev_port_info inbound;
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struct hv_dev_port_info outbound;
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};
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static void get_channel_info(struct hv_device *device,
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struct hv_device_info *info)
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{
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struct vmbus_channel_debug_info debug_info;
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if (!device->channel)
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return;
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vmbus_get_debug_info(device->channel, &debug_info);
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info->chn_id = debug_info.relid;
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info->chn_state = debug_info.state;
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memcpy(&info->chn_type, &debug_info.interfacetype,
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sizeof(uuid_le));
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memcpy(&info->chn_instance, &debug_info.interface_instance,
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sizeof(uuid_le));
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info->monitor_id = debug_info.monitorid;
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info->server_monitor_pending = debug_info.servermonitor_pending;
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info->server_monitor_latency = debug_info.servermonitor_latency;
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info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
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info->client_monitor_pending = debug_info.clientmonitor_pending;
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info->client_monitor_latency = debug_info.clientmonitor_latency;
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info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
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info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
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info->inbound.read_idx = debug_info.inbound.current_read_index;
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info->inbound.write_idx = debug_info.inbound.current_write_index;
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info->inbound.bytes_avail_toread =
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debug_info.inbound.bytes_avail_toread;
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info->inbound.bytes_avail_towrite =
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debug_info.inbound.bytes_avail_towrite;
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info->outbound.int_mask =
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debug_info.outbound.current_interrupt_mask;
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info->outbound.read_idx = debug_info.outbound.current_read_index;
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info->outbound.write_idx = debug_info.outbound.current_write_index;
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info->outbound.bytes_avail_toread =
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debug_info.outbound.bytes_avail_toread;
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info->outbound.bytes_avail_towrite =
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debug_info.outbound.bytes_avail_towrite;
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}
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#define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2)
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static void print_alias_name(struct hv_device *hv_dev, char *alias_name)
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{
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int i;
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for (i = 0; i < VMBUS_ALIAS_LEN; i += 2)
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sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
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}
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/*
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* vmbus_show_device_attr - Show the device attribute in sysfs.
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*
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* This is invoked when user does a
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* "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
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*/
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static ssize_t vmbus_show_device_attr(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_device_info *device_info;
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char alias_name[VMBUS_ALIAS_LEN + 1];
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int ret = 0;
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device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL);
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if (!device_info)
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return ret;
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get_channel_info(hv_dev, device_info);
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if (!strcmp(dev_attr->attr.name, "class_id")) {
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ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
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"%02x%02x%02x%02x%02x%02x%02x%02x}\n",
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device_info->chn_type.b[3],
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device_info->chn_type.b[2],
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device_info->chn_type.b[1],
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device_info->chn_type.b[0],
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device_info->chn_type.b[5],
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device_info->chn_type.b[4],
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device_info->chn_type.b[7],
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device_info->chn_type.b[6],
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device_info->chn_type.b[8],
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device_info->chn_type.b[9],
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device_info->chn_type.b[10],
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device_info->chn_type.b[11],
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device_info->chn_type.b[12],
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device_info->chn_type.b[13],
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device_info->chn_type.b[14],
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device_info->chn_type.b[15]);
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} else if (!strcmp(dev_attr->attr.name, "device_id")) {
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ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
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"%02x%02x%02x%02x%02x%02x%02x%02x}\n",
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device_info->chn_instance.b[3],
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device_info->chn_instance.b[2],
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device_info->chn_instance.b[1],
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device_info->chn_instance.b[0],
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device_info->chn_instance.b[5],
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device_info->chn_instance.b[4],
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device_info->chn_instance.b[7],
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device_info->chn_instance.b[6],
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device_info->chn_instance.b[8],
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device_info->chn_instance.b[9],
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device_info->chn_instance.b[10],
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device_info->chn_instance.b[11],
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device_info->chn_instance.b[12],
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device_info->chn_instance.b[13],
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device_info->chn_instance.b[14],
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device_info->chn_instance.b[15]);
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} else if (!strcmp(dev_attr->attr.name, "modalias")) {
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print_alias_name(hv_dev, alias_name);
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ret = sprintf(buf, "vmbus:%s\n", alias_name);
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} else if (!strcmp(dev_attr->attr.name, "state")) {
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ret = sprintf(buf, "%d\n", device_info->chn_state);
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} else if (!strcmp(dev_attr->attr.name, "id")) {
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ret = sprintf(buf, "%d\n", device_info->chn_id);
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} else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
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ret = sprintf(buf, "%d\n", device_info->outbound.int_mask);
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} else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
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ret = sprintf(buf, "%d\n", device_info->outbound.read_idx);
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} else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
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ret = sprintf(buf, "%d\n", device_info->outbound.write_idx);
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} else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
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ret = sprintf(buf, "%d\n",
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device_info->outbound.bytes_avail_toread);
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} else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
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ret = sprintf(buf, "%d\n",
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device_info->outbound.bytes_avail_towrite);
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} else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
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ret = sprintf(buf, "%d\n", device_info->inbound.int_mask);
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} else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
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ret = sprintf(buf, "%d\n", device_info->inbound.read_idx);
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} else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
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ret = sprintf(buf, "%d\n", device_info->inbound.write_idx);
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} else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
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ret = sprintf(buf, "%d\n",
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device_info->inbound.bytes_avail_toread);
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} else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
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ret = sprintf(buf, "%d\n",
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device_info->inbound.bytes_avail_towrite);
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} else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
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ret = sprintf(buf, "%d\n", device_info->monitor_id);
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} else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
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ret = sprintf(buf, "%d\n", device_info->server_monitor_pending);
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} else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
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ret = sprintf(buf, "%d\n", device_info->server_monitor_latency);
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} else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
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ret = sprintf(buf, "%d\n",
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device_info->server_monitor_conn_id);
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} else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
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ret = sprintf(buf, "%d\n", device_info->client_monitor_pending);
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} else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
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ret = sprintf(buf, "%d\n", device_info->client_monitor_latency);
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} else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
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ret = sprintf(buf, "%d\n",
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device_info->client_monitor_conn_id);
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}
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kfree(device_info);
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return ret;
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}
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/* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
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static struct device_attribute vmbus_device_attrs[] = {
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__ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
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__ATTR_NULL
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};
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/*
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* vmbus_uevent - add uevent for our device
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*
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* This routine is invoked when a device is added or removed on the vmbus to
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* generate a uevent to udev in the userspace. The udev will then look at its
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* rule and the uevent generated here to load the appropriate driver
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*
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* The alias string will be of the form vmbus:guid where guid is the string
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* representation of the device guid (each byte of the guid will be
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* represented with two hex characters.
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*/
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static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
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{
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struct hv_device *dev = device_to_hv_device(device);
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int ret;
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char alias_name[VMBUS_ALIAS_LEN + 1];
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print_alias_name(dev, alias_name);
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ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name);
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return ret;
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}
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static uuid_le null_guid;
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static inline bool is_null_guid(const __u8 *guid)
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{
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if (memcmp(guid, &null_guid, sizeof(uuid_le)))
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return false;
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return true;
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}
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/*
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* Return a matching hv_vmbus_device_id pointer.
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* If there is no match, return NULL.
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*/
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static const struct hv_vmbus_device_id *hv_vmbus_get_id(
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const struct hv_vmbus_device_id *id,
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__u8 *guid)
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{
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for (; !is_null_guid(id->guid); id++)
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if (!memcmp(&id->guid, guid, sizeof(uuid_le)))
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return id;
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return NULL;
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}
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/*
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* vmbus_match - Attempt to match the specified device to the specified driver
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*/
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static int vmbus_match(struct device *device, struct device_driver *driver)
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{
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struct hv_driver *drv = drv_to_hv_drv(driver);
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struct hv_device *hv_dev = device_to_hv_device(device);
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if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b))
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return 1;
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return 0;
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}
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/*
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* vmbus_probe - Add the new vmbus's child device
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*/
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static int vmbus_probe(struct device *child_device)
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{
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int ret = 0;
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struct hv_driver *drv =
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drv_to_hv_drv(child_device->driver);
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struct hv_device *dev = device_to_hv_device(child_device);
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const struct hv_vmbus_device_id *dev_id;
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dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b);
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if (drv->probe) {
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ret = drv->probe(dev, dev_id);
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if (ret != 0)
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pr_err("probe failed for device %s (%d)\n",
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dev_name(child_device), ret);
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} else {
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pr_err("probe not set for driver %s\n",
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dev_name(child_device));
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ret = -ENODEV;
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}
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return ret;
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}
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/*
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* vmbus_remove - Remove a vmbus device
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*/
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static int vmbus_remove(struct device *child_device)
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{
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struct hv_driver *drv = drv_to_hv_drv(child_device->driver);
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struct hv_device *dev = device_to_hv_device(child_device);
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if (drv->remove)
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drv->remove(dev);
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else
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pr_err("remove not set for driver %s\n",
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dev_name(child_device));
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return 0;
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}
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/*
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* vmbus_shutdown - Shutdown a vmbus device
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*/
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static void vmbus_shutdown(struct device *child_device)
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{
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struct hv_driver *drv;
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struct hv_device *dev = device_to_hv_device(child_device);
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/* The device may not be attached yet */
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if (!child_device->driver)
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return;
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drv = drv_to_hv_drv(child_device->driver);
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if (drv->shutdown)
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drv->shutdown(dev);
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return;
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}
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/*
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* vmbus_device_release - Final callback release of the vmbus child device
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*/
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static void vmbus_device_release(struct device *device)
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{
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struct hv_device *hv_dev = device_to_hv_device(device);
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kfree(hv_dev);
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}
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/* The one and only one */
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static struct bus_type hv_bus = {
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.name = "vmbus",
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.match = vmbus_match,
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.shutdown = vmbus_shutdown,
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.remove = vmbus_remove,
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.probe = vmbus_probe,
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.uevent = vmbus_uevent,
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.dev_attrs = vmbus_device_attrs,
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};
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static const char *driver_name = "hyperv";
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struct onmessage_work_context {
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struct work_struct work;
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struct hv_message msg;
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};
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static void vmbus_onmessage_work(struct work_struct *work)
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{
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struct onmessage_work_context *ctx;
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ctx = container_of(work, struct onmessage_work_context,
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work);
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vmbus_onmessage(&ctx->msg);
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kfree(ctx);
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}
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static void vmbus_on_msg_dpc(unsigned long data)
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{
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int cpu = smp_processor_id();
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void *page_addr = hv_context.synic_message_page[cpu];
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struct hv_message *msg = (struct hv_message *)page_addr +
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VMBUS_MESSAGE_SINT;
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struct onmessage_work_context *ctx;
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while (1) {
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if (msg->header.message_type == HVMSG_NONE) {
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/* no msg */
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|
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_init(hv_acpi_init);
|