![Haiyang Zhang](/assets/img/avatar_default.png)
There is a possible race condition when hv_utils starts to load immediately after hv_vmbus is loading - null pointer error could happen. This patch added wait/completion to ensure all channels are ready before vmbus loading completes. So another module won't have any uninitialized channel. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Hank Janssen <hjanssen@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1044 lines
31 KiB
C
1044 lines
31 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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*/
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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/pci.h>
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#include <linux/dmi.h>
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#include <linux/slab.h>
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#include <linux/completion.h>
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#include "version_info.h"
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#include "osd.h"
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#include "logging.h"
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#include "vmbus.h"
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/* FIXME! We need to do this dynamically for PIC and APIC system */
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#define VMBUS_IRQ 0x5
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#define VMBUS_IRQ_VECTOR IRQ5_VECTOR
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/* Main vmbus driver data structure */
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struct vmbus_driver_context {
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/* !! These must be the first 2 fields !! */
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/* FIXME, this is a bug */
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/* The driver field is not used in here. Instead, the bus field is */
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/* used to represent the driver */
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struct driver_context drv_ctx;
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struct vmbus_driver drv_obj;
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struct bus_type bus;
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struct tasklet_struct msg_dpc;
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struct tasklet_struct event_dpc;
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/* The bus root device */
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struct vm_device device_ctx;
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};
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static int vmbus_match(struct device *device, struct device_driver *driver);
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static int vmbus_probe(struct device *device);
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static int vmbus_remove(struct device *device);
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static void vmbus_shutdown(struct device *device);
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static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
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static void vmbus_msg_dpc(unsigned long data);
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static void vmbus_event_dpc(unsigned long data);
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static irqreturn_t vmbus_isr(int irq, void *dev_id);
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static void vmbus_device_release(struct device *device);
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static void vmbus_bus_release(struct device *device);
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static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
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struct hv_guid *instance,
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void *context);
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static void vmbus_child_device_destroy(struct hv_device *device_obj);
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static int vmbus_child_device_register(struct hv_device *root_device_obj,
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struct hv_device *child_device_obj);
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static void vmbus_child_device_unregister(struct hv_device *child_device_obj);
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static void vmbus_child_device_get_info(struct hv_device *device_obj,
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struct hv_device_info *device_info);
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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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unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
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EXPORT_SYMBOL(vmbus_loglevel);
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/* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
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/* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
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static int vmbus_irq = VMBUS_IRQ;
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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(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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/* The one and only one */
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static struct vmbus_driver_context g_vmbus_drv = {
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.bus.name = "vmbus",
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.bus.match = vmbus_match,
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.bus.shutdown = vmbus_shutdown,
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.bus.remove = vmbus_remove,
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.bus.probe = vmbus_probe,
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.bus.uevent = vmbus_uevent,
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.bus.dev_attrs = vmbus_device_attrs,
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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 vm_device *device_ctx = device_to_vm_device(dev);
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struct hv_device_info device_info;
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memset(&device_info, 0, sizeof(struct hv_device_info));
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vmbus_child_device_get_info(&device_ctx->device_obj, &device_info);
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if (!strcmp(dev_attr->attr.name, "class_id")) {
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return 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.ChannelType.data[3],
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device_info.ChannelType.data[2],
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device_info.ChannelType.data[1],
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device_info.ChannelType.data[0],
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device_info.ChannelType.data[5],
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device_info.ChannelType.data[4],
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device_info.ChannelType.data[7],
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device_info.ChannelType.data[6],
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device_info.ChannelType.data[8],
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device_info.ChannelType.data[9],
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device_info.ChannelType.data[10],
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device_info.ChannelType.data[11],
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device_info.ChannelType.data[12],
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device_info.ChannelType.data[13],
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device_info.ChannelType.data[14],
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device_info.ChannelType.data[15]);
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} else if (!strcmp(dev_attr->attr.name, "device_id")) {
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return 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.ChannelInstance.data[3],
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device_info.ChannelInstance.data[2],
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device_info.ChannelInstance.data[1],
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device_info.ChannelInstance.data[0],
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device_info.ChannelInstance.data[5],
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device_info.ChannelInstance.data[4],
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device_info.ChannelInstance.data[7],
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device_info.ChannelInstance.data[6],
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device_info.ChannelInstance.data[8],
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device_info.ChannelInstance.data[9],
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device_info.ChannelInstance.data[10],
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device_info.ChannelInstance.data[11],
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device_info.ChannelInstance.data[12],
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device_info.ChannelInstance.data[13],
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device_info.ChannelInstance.data[14],
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device_info.ChannelInstance.data[15]);
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} else if (!strcmp(dev_attr->attr.name, "state")) {
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return sprintf(buf, "%d\n", device_info.ChannelState);
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} else if (!strcmp(dev_attr->attr.name, "id")) {
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return sprintf(buf, "%d\n", device_info.ChannelId);
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} else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
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return sprintf(buf, "%d\n", device_info.Outbound.InterruptMask);
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} else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
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return sprintf(buf, "%d\n", device_info.Outbound.ReadIndex);
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} else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
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return sprintf(buf, "%d\n", device_info.Outbound.WriteIndex);
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} else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
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return sprintf(buf, "%d\n",
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device_info.Outbound.BytesAvailToRead);
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} else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
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return sprintf(buf, "%d\n",
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device_info.Outbound.BytesAvailToWrite);
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} else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
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return sprintf(buf, "%d\n", device_info.Inbound.InterruptMask);
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} else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
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return sprintf(buf, "%d\n", device_info.Inbound.ReadIndex);
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} else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
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return sprintf(buf, "%d\n", device_info.Inbound.WriteIndex);
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} else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
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return sprintf(buf, "%d\n",
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device_info.Inbound.BytesAvailToRead);
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} else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
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return sprintf(buf, "%d\n",
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device_info.Inbound.BytesAvailToWrite);
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} else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
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return sprintf(buf, "%d\n", device_info.MonitorId);
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} else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
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return sprintf(buf, "%d\n", device_info.ServerMonitorPending);
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} else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
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return sprintf(buf, "%d\n", device_info.ServerMonitorLatency);
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} else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
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return sprintf(buf, "%d\n",
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device_info.ServerMonitorConnectionId);
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} else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
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return sprintf(buf, "%d\n", device_info.ClientMonitorPending);
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} else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
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return sprintf(buf, "%d\n", device_info.ClientMonitorLatency);
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} else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
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return sprintf(buf, "%d\n",
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device_info.ClientMonitorConnectionId);
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} else {
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return 0;
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}
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}
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/*
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* vmbus_bus_init -Main vmbus driver initialization routine.
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*
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* Here, we
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* - initialize the vmbus driver context
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* - setup various driver entry points
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* - invoke the vmbus hv main init routine
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* - get the irq resource
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* - invoke the vmbus to add the vmbus root device
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* - setup the vmbus root device
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* - retrieve the channel offers
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*/
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static int vmbus_bus_init(int (*drv_init)(struct hv_driver *drv))
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{
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struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
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struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
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struct vm_device *dev_ctx = &g_vmbus_drv.device_ctx;
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int ret;
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unsigned int vector;
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DPRINT_ENTER(VMBUS_DRV);
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/*
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* Set this up to allow lower layer to callback to add/remove child
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* devices on the bus
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*/
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vmbus_drv_obj->OnChildDeviceCreate = vmbus_child_device_create;
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vmbus_drv_obj->OnChildDeviceDestroy = vmbus_child_device_destroy;
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vmbus_drv_obj->OnChildDeviceAdd = vmbus_child_device_register;
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vmbus_drv_obj->OnChildDeviceRemove = vmbus_child_device_unregister;
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/* Call to bus driver to initialize */
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ret = drv_init(&vmbus_drv_obj->Base);
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if (ret != 0) {
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DPRINT_ERR(VMBUS_DRV, "Unable to initialize vmbus (%d)", ret);
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goto cleanup;
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}
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/* Sanity checks */
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if (!vmbus_drv_obj->Base.OnDeviceAdd) {
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DPRINT_ERR(VMBUS_DRV, "OnDeviceAdd() routine not set");
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ret = -1;
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goto cleanup;
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}
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vmbus_drv_ctx->bus.name = vmbus_drv_obj->Base.name;
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/* Initialize the bus context */
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tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_msg_dpc,
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(unsigned long)vmbus_drv_obj);
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tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_event_dpc,
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(unsigned long)vmbus_drv_obj);
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/* Now, register the bus driver with LDM */
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ret = bus_register(&vmbus_drv_ctx->bus);
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if (ret) {
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ret = -1;
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goto cleanup;
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}
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/* Get the interrupt resource */
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ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
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vmbus_drv_obj->Base.name, NULL);
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if (ret != 0) {
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DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
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vmbus_irq);
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bus_unregister(&vmbus_drv_ctx->bus);
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ret = -1;
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goto cleanup;
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}
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vector = VMBUS_IRQ_VECTOR;
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DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
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/* Call to bus driver to add the root device */
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memset(dev_ctx, 0, sizeof(struct vm_device));
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ret = vmbus_drv_obj->Base.OnDeviceAdd(&dev_ctx->device_obj, &vector);
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if (ret != 0) {
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DPRINT_ERR(VMBUS_DRV,
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"ERROR - Unable to add vmbus root device");
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free_irq(vmbus_irq, NULL);
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bus_unregister(&vmbus_drv_ctx->bus);
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ret = -1;
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goto cleanup;
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}
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/* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
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dev_set_name(&dev_ctx->device, "vmbus_0_0");
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memcpy(&dev_ctx->class_id, &dev_ctx->device_obj.deviceType,
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sizeof(struct hv_guid));
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memcpy(&dev_ctx->device_id, &dev_ctx->device_obj.deviceInstance,
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sizeof(struct hv_guid));
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/* No need to bind a driver to the root device. */
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dev_ctx->device.parent = NULL;
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/* NULL; vmbus_remove() does not get invoked */
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dev_ctx->device.bus = &vmbus_drv_ctx->bus;
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/* Setup the device dispatch table */
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dev_ctx->device.release = vmbus_bus_release;
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/* Setup the bus as root device */
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ret = device_register(&dev_ctx->device);
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if (ret) {
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DPRINT_ERR(VMBUS_DRV,
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"ERROR - Unable to register vmbus root device");
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free_irq(vmbus_irq, NULL);
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bus_unregister(&vmbus_drv_ctx->bus);
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ret = -1;
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goto cleanup;
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}
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vmbus_drv_obj->GetChannelOffers();
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wait_for_completion(&hv_channel_ready);
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cleanup:
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DPRINT_EXIT(VMBUS_DRV);
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return ret;
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}
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/*
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* vmbus_bus_exit - Terminate the vmbus driver.
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*
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* This routine is opposite of vmbus_bus_init()
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*/
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static void vmbus_bus_exit(void)
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{
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struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
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struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
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struct vm_device *dev_ctx = &g_vmbus_drv.device_ctx;
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DPRINT_ENTER(VMBUS_DRV);
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/* Remove the root device */
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if (vmbus_drv_obj->Base.OnDeviceRemove)
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vmbus_drv_obj->Base.OnDeviceRemove(&dev_ctx->device_obj);
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if (vmbus_drv_obj->Base.OnCleanup)
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vmbus_drv_obj->Base.OnCleanup(&vmbus_drv_obj->Base);
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/* Unregister the root bus device */
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device_unregister(&dev_ctx->device);
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bus_unregister(&vmbus_drv_ctx->bus);
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free_irq(vmbus_irq, NULL);
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tasklet_kill(&vmbus_drv_ctx->msg_dpc);
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tasklet_kill(&vmbus_drv_ctx->event_dpc);
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DPRINT_EXIT(VMBUS_DRV);
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return;
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}
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/**
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* vmbus_child_driver_register() - Register a vmbus's child driver
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* @driver_ctx: Pointer to driver structure you want to register
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*
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* @driver_ctx is of type &struct driver_context
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*
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* Registers the given driver with Linux through the 'driver_register()' call
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* And sets up the hyper-v vmbus handling for this driver.
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* It will return the state of the 'driver_register()' call.
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*
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* Mainly used by Hyper-V drivers.
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*/
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int vmbus_child_driver_register(struct driver_context *driver_ctx)
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{
|
|
struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
|
|
int ret;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
|
|
driver_ctx, driver_ctx->driver.name);
|
|
|
|
/* The child driver on this vmbus */
|
|
driver_ctx->driver.bus = &g_vmbus_drv.bus;
|
|
|
|
ret = driver_register(&driver_ctx->driver);
|
|
|
|
vmbus_drv_obj->GetChannelOffers();
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(vmbus_child_driver_register);
|
|
|
|
/**
|
|
* vmbus_child_driver_unregister() - Unregister a vmbus's child driver
|
|
* @driver_ctx: Pointer to driver structure you want to un-register
|
|
*
|
|
* @driver_ctx is of type &struct driver_context
|
|
*
|
|
* Un-register the given driver with Linux through the 'driver_unregister()'
|
|
* call. And ungegisters the driver from the Hyper-V vmbus handler.
|
|
*
|
|
* Mainly used by Hyper-V drivers.
|
|
*/
|
|
void vmbus_child_driver_unregister(struct driver_context *driver_ctx)
|
|
{
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
|
|
driver_ctx, driver_ctx->driver.name);
|
|
|
|
driver_unregister(&driver_ctx->driver);
|
|
|
|
driver_ctx->driver.bus = NULL;
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
}
|
|
EXPORT_SYMBOL(vmbus_child_driver_unregister);
|
|
|
|
/**
|
|
* vmbus_get_interface() - Get the vmbus channel interface.
|
|
* @interface: Pointer to channel interface structure
|
|
*
|
|
* Get the Hyper-V channel used for the driver.
|
|
*
|
|
* @interface is of type &struct vmbus_channel_interface
|
|
* This is invoked by child/client driver that sits above vmbus.
|
|
*
|
|
* Mainly used by Hyper-V drivers.
|
|
*/
|
|
void vmbus_get_interface(struct vmbus_channel_interface *interface)
|
|
{
|
|
struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
|
|
|
|
vmbus_drv_obj->GetChannelInterface(interface);
|
|
}
|
|
EXPORT_SYMBOL(vmbus_get_interface);
|
|
|
|
/*
|
|
* vmbus_child_device_get_info - Get the vmbus child device info.
|
|
*
|
|
* This is invoked to display various device attributes in sysfs.
|
|
*/
|
|
static void vmbus_child_device_get_info(struct hv_device *device_obj,
|
|
struct hv_device_info *device_info)
|
|
{
|
|
struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
|
|
|
|
vmbus_drv_obj->GetChannelInfo(device_obj, device_info);
|
|
}
|
|
|
|
/*
|
|
* vmbus_child_device_create - Creates and registers a new child device
|
|
* on the vmbus.
|
|
*/
|
|
static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
|
|
struct hv_guid *instance,
|
|
void *context)
|
|
{
|
|
struct vm_device *child_device_ctx;
|
|
struct hv_device *child_device_obj;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* Allocate the new child device */
|
|
child_device_ctx = kzalloc(sizeof(struct vm_device), GFP_KERNEL);
|
|
if (!child_device_ctx) {
|
|
DPRINT_ERR(VMBUS_DRV,
|
|
"unable to allocate device_context for child device");
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
|
|
"type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
|
|
"%02x%02x%02x%02x%02x%02x%02x%02x},"
|
|
"id {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
|
|
"%02x%02x%02x%02x%02x%02x%02x%02x}",
|
|
&child_device_ctx->device,
|
|
type->data[3], type->data[2], type->data[1], type->data[0],
|
|
type->data[5], type->data[4], type->data[7], type->data[6],
|
|
type->data[8], type->data[9], type->data[10], type->data[11],
|
|
type->data[12], type->data[13], type->data[14], type->data[15],
|
|
instance->data[3], instance->data[2],
|
|
instance->data[1], instance->data[0],
|
|
instance->data[5], instance->data[4],
|
|
instance->data[7], instance->data[6],
|
|
instance->data[8], instance->data[9],
|
|
instance->data[10], instance->data[11],
|
|
instance->data[12], instance->data[13],
|
|
instance->data[14], instance->data[15]);
|
|
|
|
child_device_obj = &child_device_ctx->device_obj;
|
|
child_device_obj->context = context;
|
|
memcpy(&child_device_obj->deviceType, type, sizeof(struct hv_guid));
|
|
memcpy(&child_device_obj->deviceInstance, instance,
|
|
sizeof(struct hv_guid));
|
|
|
|
memcpy(&child_device_ctx->class_id, type, sizeof(struct hv_guid));
|
|
memcpy(&child_device_ctx->device_id, instance, sizeof(struct hv_guid));
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return child_device_obj;
|
|
}
|
|
|
|
/*
|
|
* vmbus_child_device_register - Register the child device on the specified bus
|
|
*/
|
|
static int vmbus_child_device_register(struct hv_device *root_device_obj,
|
|
struct hv_device *child_device_obj)
|
|
{
|
|
int ret = 0;
|
|
struct vm_device *root_device_ctx =
|
|
to_vm_device(root_device_obj);
|
|
struct vm_device *child_device_ctx =
|
|
to_vm_device(child_device_obj);
|
|
static atomic_t device_num = ATOMIC_INIT(0);
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
|
|
child_device_ctx);
|
|
|
|
/* Set the device name. Otherwise, device_register() will fail. */
|
|
dev_set_name(&child_device_ctx->device, "vmbus_0_%d",
|
|
atomic_inc_return(&device_num));
|
|
|
|
/* The new device belongs to this bus */
|
|
child_device_ctx->device.bus = &g_vmbus_drv.bus; /* device->dev.bus; */
|
|
child_device_ctx->device.parent = &root_device_ctx->device;
|
|
child_device_ctx->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_ctx->device);
|
|
|
|
/* vmbus_probe() error does not get propergate to device_register(). */
|
|
ret = child_device_ctx->probe_error;
|
|
|
|
if (ret)
|
|
DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
|
|
&child_device_ctx->device);
|
|
else
|
|
DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
|
|
&child_device_ctx->device);
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* vmbus_child_device_unregister - Remove the specified child device
|
|
* from the vmbus.
|
|
*/
|
|
static void vmbus_child_device_unregister(struct hv_device *device_obj)
|
|
{
|
|
struct vm_device *device_ctx = to_vm_device(device_obj);
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
|
|
&device_ctx->device);
|
|
|
|
/*
|
|
* Kick off the process of unregistering the device.
|
|
* This will call vmbus_remove() and eventually vmbus_device_release()
|
|
*/
|
|
device_unregister(&device_ctx->device);
|
|
|
|
DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
|
|
&device_ctx->device);
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
}
|
|
|
|
/*
|
|
* vmbus_child_device_destroy - Destroy the specified child device on the vmbus.
|
|
*/
|
|
static void vmbus_child_device_destroy(struct hv_device *device_obj)
|
|
{
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
}
|
|
|
|
/*
|
|
* vmbus_uevent - add uevent for our device
|
|
*
|
|
* This routine is invoked when a device is added or removed on the vmbus to
|
|
* generate a uevent to udev in the userspace. The udev will then look at its
|
|
* rule and the uevent generated here to load the appropriate driver
|
|
*/
|
|
static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
|
|
{
|
|
struct vm_device *device_ctx = device_to_vm_device(device);
|
|
int ret;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={"
|
|
"%02x%02x%02x%02x-%02x%02x-%02x%02x-"
|
|
"%02x%02x%02x%02x%02x%02x%02x%02x}",
|
|
device_ctx->class_id.data[3], device_ctx->class_id.data[2],
|
|
device_ctx->class_id.data[1], device_ctx->class_id.data[0],
|
|
device_ctx->class_id.data[5], device_ctx->class_id.data[4],
|
|
device_ctx->class_id.data[7], device_ctx->class_id.data[6],
|
|
device_ctx->class_id.data[8], device_ctx->class_id.data[9],
|
|
device_ctx->class_id.data[10],
|
|
device_ctx->class_id.data[11],
|
|
device_ctx->class_id.data[12],
|
|
device_ctx->class_id.data[13],
|
|
device_ctx->class_id.data[14],
|
|
device_ctx->class_id.data[15]);
|
|
|
|
ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
|
|
"%02x%02x%02x%02x-%02x%02x-%02x%02x-"
|
|
"%02x%02x%02x%02x%02x%02x%02x%02x}",
|
|
device_ctx->class_id.data[3],
|
|
device_ctx->class_id.data[2],
|
|
device_ctx->class_id.data[1],
|
|
device_ctx->class_id.data[0],
|
|
device_ctx->class_id.data[5],
|
|
device_ctx->class_id.data[4],
|
|
device_ctx->class_id.data[7],
|
|
device_ctx->class_id.data[6],
|
|
device_ctx->class_id.data[8],
|
|
device_ctx->class_id.data[9],
|
|
device_ctx->class_id.data[10],
|
|
device_ctx->class_id.data[11],
|
|
device_ctx->class_id.data[12],
|
|
device_ctx->class_id.data[13],
|
|
device_ctx->class_id.data[14],
|
|
device_ctx->class_id.data[15]);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
|
|
"%02x%02x%02x%02x-%02x%02x-%02x%02x-"
|
|
"%02x%02x%02x%02x%02x%02x%02x%02x}",
|
|
device_ctx->device_id.data[3],
|
|
device_ctx->device_id.data[2],
|
|
device_ctx->device_id.data[1],
|
|
device_ctx->device_id.data[0],
|
|
device_ctx->device_id.data[5],
|
|
device_ctx->device_id.data[4],
|
|
device_ctx->device_id.data[7],
|
|
device_ctx->device_id.data[6],
|
|
device_ctx->device_id.data[8],
|
|
device_ctx->device_id.data[9],
|
|
device_ctx->device_id.data[10],
|
|
device_ctx->device_id.data[11],
|
|
device_ctx->device_id.data[12],
|
|
device_ctx->device_id.data[13],
|
|
device_ctx->device_id.data[14],
|
|
device_ctx->device_id.data[15]);
|
|
if (ret)
|
|
return ret;
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* vmbus_match - Attempt to match the specified device to the specified driver
|
|
*/
|
|
static int vmbus_match(struct device *device, struct device_driver *driver)
|
|
{
|
|
int match = 0;
|
|
struct driver_context *driver_ctx = driver_to_driver_context(driver);
|
|
struct vm_device *device_ctx = device_to_vm_device(device);
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* We found our driver ? */
|
|
if (memcmp(&device_ctx->class_id, &driver_ctx->class_id,
|
|
sizeof(struct hv_guid)) == 0) {
|
|
/*
|
|
* !! NOTE: The driver_ctx is not a vmbus_drv_ctx. We typecast
|
|
* it here to access the struct hv_driver field
|
|
*/
|
|
struct vmbus_driver_context *vmbus_drv_ctx =
|
|
(struct vmbus_driver_context *)driver_ctx;
|
|
|
|
device_ctx->device_obj.Driver = &vmbus_drv_ctx->drv_obj.Base;
|
|
DPRINT_INFO(VMBUS_DRV,
|
|
"device object (%p) set to driver object (%p)",
|
|
&device_ctx->device_obj,
|
|
device_ctx->device_obj.Driver);
|
|
|
|
match = 1;
|
|
}
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return match;
|
|
}
|
|
|
|
/*
|
|
* vmbus_probe_failed_cb - Callback when a driver probe failed in vmbus_probe()
|
|
*
|
|
* We need a callback because we cannot invoked device_unregister() inside
|
|
* vmbus_probe() since vmbus_probe() may be invoked inside device_register()
|
|
* i.e. we cannot call device_unregister() inside device_register()
|
|
*/
|
|
static void vmbus_probe_failed_cb(struct work_struct *context)
|
|
{
|
|
struct vm_device *device_ctx = (struct vm_device *)context;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/*
|
|
* Kick off the process of unregistering the device.
|
|
* This will call vmbus_remove() and eventually vmbus_device_release()
|
|
*/
|
|
device_unregister(&device_ctx->device);
|
|
|
|
/* put_device(&device_ctx->device); */
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
}
|
|
|
|
/*
|
|
* vmbus_probe - Add the new vmbus's child device
|
|
*/
|
|
static int vmbus_probe(struct device *child_device)
|
|
{
|
|
int ret = 0;
|
|
struct driver_context *driver_ctx =
|
|
driver_to_driver_context(child_device->driver);
|
|
struct vm_device *device_ctx =
|
|
device_to_vm_device(child_device);
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* Let the specific open-source driver handles the probe if it can */
|
|
if (driver_ctx->probe) {
|
|
ret = device_ctx->probe_error = driver_ctx->probe(child_device);
|
|
if (ret != 0) {
|
|
DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s "
|
|
"(%p) on driver %s (%d)...",
|
|
dev_name(child_device), child_device,
|
|
child_device->driver->name, ret);
|
|
|
|
INIT_WORK(&device_ctx->probe_failed_work_item,
|
|
vmbus_probe_failed_cb);
|
|
schedule_work(&device_ctx->probe_failed_work_item);
|
|
}
|
|
} else {
|
|
DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
|
|
child_device->driver->name);
|
|
ret = -1;
|
|
}
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* vmbus_remove - Remove a vmbus device
|
|
*/
|
|
static int vmbus_remove(struct device *child_device)
|
|
{
|
|
int ret;
|
|
struct driver_context *driver_ctx;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* Special case root bus device */
|
|
if (child_device->parent == NULL) {
|
|
/*
|
|
* No-op since it is statically defined and handle in
|
|
* vmbus_bus_exit()
|
|
*/
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
return 0;
|
|
}
|
|
|
|
if (child_device->driver) {
|
|
driver_ctx = driver_to_driver_context(child_device->driver);
|
|
|
|
/*
|
|
* Let the specific open-source driver handles the removal if
|
|
* it can
|
|
*/
|
|
if (driver_ctx->remove) {
|
|
ret = driver_ctx->remove(child_device);
|
|
} else {
|
|
DPRINT_ERR(VMBUS_DRV,
|
|
"remove() method not set for driver - %s",
|
|
child_device->driver->name);
|
|
ret = -1;
|
|
}
|
|
}
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* vmbus_shutdown - Shutdown a vmbus device
|
|
*/
|
|
static void vmbus_shutdown(struct device *child_device)
|
|
{
|
|
struct driver_context *driver_ctx;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* Special case root bus device */
|
|
if (child_device->parent == NULL) {
|
|
/*
|
|
* No-op since it is statically defined and handle in
|
|
* vmbus_bus_exit()
|
|
*/
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
return;
|
|
}
|
|
|
|
/* The device may not be attached yet */
|
|
if (!child_device->driver) {
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
return;
|
|
}
|
|
|
|
driver_ctx = driver_to_driver_context(child_device->driver);
|
|
|
|
/* Let the specific open-source driver handles the removal if it can */
|
|
if (driver_ctx->shutdown)
|
|
driver_ctx->shutdown(child_device);
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* vmbus_bus_release - Final callback release of the vmbus root device
|
|
*/
|
|
static void vmbus_bus_release(struct device *device)
|
|
{
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
/* FIXME */
|
|
/* Empty release functions are a bug, or a major sign
|
|
* of a problem design, this MUST BE FIXED! */
|
|
dev_err(device, "%s needs to be fixed!\n", __func__);
|
|
WARN_ON(1);
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
}
|
|
|
|
/*
|
|
* vmbus_device_release - Final callback release of the vmbus child device
|
|
*/
|
|
static void vmbus_device_release(struct device *device)
|
|
{
|
|
struct vm_device *device_ctx = device_to_vm_device(device);
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* vmbus_child_device_destroy(&device_ctx->device_obj); */
|
|
kfree(device_ctx);
|
|
|
|
/* !!DO NOT REFERENCE device_ctx anymore at this point!! */
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* vmbus_msg_dpc - Tasklet routine to handle hypervisor messages
|
|
*/
|
|
static void vmbus_msg_dpc(unsigned long data)
|
|
{
|
|
struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)data;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* ASSERT(vmbus_drv_obj->OnMsgDpc != NULL); */
|
|
|
|
/* Call to bus driver to handle interrupt */
|
|
vmbus_drv_obj->OnMsgDpc(&vmbus_drv_obj->Base);
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
}
|
|
|
|
/*
|
|
* vmbus_msg_dpc - Tasklet routine to handle hypervisor events
|
|
*/
|
|
static void vmbus_event_dpc(unsigned long data)
|
|
{
|
|
struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)data;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* ASSERT(vmbus_drv_obj->OnEventDpc != NULL); */
|
|
|
|
/* Call to bus driver to handle interrupt */
|
|
vmbus_drv_obj->OnEventDpc(&vmbus_drv_obj->Base);
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
}
|
|
|
|
static irqreturn_t vmbus_isr(int irq, void *dev_id)
|
|
{
|
|
struct vmbus_driver *vmbus_driver_obj = &g_vmbus_drv.drv_obj;
|
|
int ret;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
/* ASSERT(vmbus_driver_obj->OnIsr != NULL); */
|
|
|
|
/* Call to bus driver to handle interrupt */
|
|
ret = vmbus_driver_obj->OnIsr(&vmbus_driver_obj->Base);
|
|
|
|
/* Schedules a dpc if necessary */
|
|
if (ret > 0) {
|
|
if (test_bit(0, (unsigned long *)&ret))
|
|
tasklet_schedule(&g_vmbus_drv.msg_dpc);
|
|
|
|
if (test_bit(1, (unsigned long *)&ret))
|
|
tasklet_schedule(&g_vmbus_drv.event_dpc);
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
return IRQ_HANDLED;
|
|
} else {
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
return IRQ_NONE;
|
|
}
|
|
}
|
|
|
|
static struct dmi_system_id __initdata microsoft_hv_dmi_table[] = {
|
|
{
|
|
.ident = "Hyper-V",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
|
|
},
|
|
},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(dmi, microsoft_hv_dmi_table);
|
|
|
|
static int __init vmbus_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
DPRINT_INFO(VMBUS_DRV,
|
|
"Vmbus initializing.... current log level 0x%x (%x,%x)",
|
|
vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
|
|
/* Todo: it is used for loglevel, to be ported to new kernel. */
|
|
|
|
if (!dmi_check_system(microsoft_hv_dmi_table))
|
|
return -ENODEV;
|
|
|
|
ret = vmbus_bus_init(VmbusInitialize);
|
|
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit vmbus_exit(void)
|
|
{
|
|
DPRINT_ENTER(VMBUS_DRV);
|
|
|
|
vmbus_bus_exit();
|
|
/* Todo: it is used for loglevel, to be ported to new kernel. */
|
|
DPRINT_EXIT(VMBUS_DRV);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We use a PCI table to determine if we should autoload this driver This is
|
|
* needed by distro tools to determine if the hyperv drivers should be
|
|
* installed and/or configured. We don't do anything else with the table, but
|
|
* it needs to be present.
|
|
*/
|
|
const static struct pci_device_id microsoft_hv_pci_table[] = {
|
|
{ PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
|
|
{ 0 }
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(HV_DRV_VERSION);
|
|
module_param(vmbus_irq, int, S_IRUGO);
|
|
module_param(vmbus_loglevel, int, S_IRUGO);
|
|
|
|
module_init(vmbus_init);
|
|
module_exit(vmbus_exit);
|