689 строки
19 KiB
C
689 строки
19 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/completion.h>
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#include <linux/hyperv.h>
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#include "hyperv_vmbus.h"
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struct vmbus_channel_message_table_entry {
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enum vmbus_channel_message_type message_type;
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void (*message_handler)(struct vmbus_channel_message_header *msg);
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};
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/**
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* vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
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* @icmsghdrp: Pointer to msg header structure
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* @icmsg_negotiate: Pointer to negotiate message structure
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* @buf: Raw buffer channel data
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*
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* @icmsghdrp is of type &struct icmsg_hdr.
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* @negop is of type &struct icmsg_negotiate.
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* Set up and fill in default negotiate response message.
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*
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* The max_fw_version specifies the maximum framework version that
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* we can support and max _srv_version specifies the maximum service
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* version we can support. A special value MAX_SRV_VER can be
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* specified to indicate that we can handle the maximum version
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* exposed by the host.
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*
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* Mainly used by Hyper-V drivers.
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*/
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void vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
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struct icmsg_negotiate *negop, u8 *buf,
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int max_fw_version, int max_srv_version)
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{
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int icframe_vercnt;
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int icmsg_vercnt;
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int i;
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icmsghdrp->icmsgsize = 0x10;
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negop = (struct icmsg_negotiate *)&buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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icframe_vercnt = negop->icframe_vercnt;
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icmsg_vercnt = negop->icmsg_vercnt;
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/*
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* Select the framework version number we will
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* support.
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*/
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for (i = 0; i < negop->icframe_vercnt; i++) {
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if (negop->icversion_data[i].major <= max_fw_version)
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icframe_vercnt = negop->icversion_data[i].major;
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}
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for (i = negop->icframe_vercnt;
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(i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) {
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if (negop->icversion_data[i].major <= max_srv_version)
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icmsg_vercnt = negop->icversion_data[i].major;
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}
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/*
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* Respond with the maximum framework and service
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* version numbers we can support.
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*/
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negop->icframe_vercnt = 1;
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negop->icmsg_vercnt = 1;
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negop->icversion_data[0].major = icframe_vercnt;
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negop->icversion_data[0].minor = 0;
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negop->icversion_data[1].major = icmsg_vercnt;
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negop->icversion_data[1].minor = 0;
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}
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EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp);
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/*
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* alloc_channel - Allocate and initialize a vmbus channel object
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*/
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static struct vmbus_channel *alloc_channel(void)
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{
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struct vmbus_channel *channel;
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channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
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if (!channel)
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return NULL;
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spin_lock_init(&channel->inbound_lock);
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channel->controlwq = create_workqueue("hv_vmbus_ctl");
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if (!channel->controlwq) {
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kfree(channel);
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return NULL;
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}
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return channel;
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}
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/*
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* release_hannel - Release the vmbus channel object itself
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*/
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static void release_channel(struct work_struct *work)
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{
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struct vmbus_channel *channel = container_of(work,
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struct vmbus_channel,
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work);
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destroy_workqueue(channel->controlwq);
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kfree(channel);
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}
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/*
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* free_channel - Release the resources used by the vmbus channel object
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*/
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static void free_channel(struct vmbus_channel *channel)
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{
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/*
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* We have to release the channel's workqueue/thread in the vmbus's
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* workqueue/thread context
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* ie we can't destroy ourselves.
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*/
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INIT_WORK(&channel->work, release_channel);
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queue_work(vmbus_connection.work_queue, &channel->work);
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}
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/*
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* vmbus_process_rescind_offer -
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* Rescind the offer by initiating a device removal
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*/
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static void vmbus_process_rescind_offer(struct work_struct *work)
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{
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struct vmbus_channel *channel = container_of(work,
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struct vmbus_channel,
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work);
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unsigned long flags;
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struct vmbus_channel_relid_released msg;
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vmbus_device_unregister(channel->device_obj);
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memset(&msg, 0, sizeof(struct vmbus_channel_relid_released));
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msg.child_relid = channel->offermsg.child_relid;
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msg.header.msgtype = CHANNELMSG_RELID_RELEASED;
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vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released));
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spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
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list_del(&channel->listentry);
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spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
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free_channel(channel);
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}
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void vmbus_free_channels(void)
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{
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struct vmbus_channel *channel;
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list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
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vmbus_device_unregister(channel->device_obj);
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kfree(channel->device_obj);
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free_channel(channel);
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}
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}
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/*
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* vmbus_process_offer - Process the offer by creating a channel/device
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* associated with this offer
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*/
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static void vmbus_process_offer(struct work_struct *work)
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{
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struct vmbus_channel *newchannel = container_of(work,
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struct vmbus_channel,
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work);
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struct vmbus_channel *channel;
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bool fnew = true;
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int ret;
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unsigned long flags;
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/* The next possible work is rescind handling */
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INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
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/* Make sure this is a new offer */
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spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
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list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
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if (!uuid_le_cmp(channel->offermsg.offer.if_type,
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newchannel->offermsg.offer.if_type) &&
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!uuid_le_cmp(channel->offermsg.offer.if_instance,
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newchannel->offermsg.offer.if_instance)) {
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fnew = false;
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break;
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}
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}
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if (fnew)
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list_add_tail(&newchannel->listentry,
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&vmbus_connection.chn_list);
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spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
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if (!fnew) {
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free_channel(newchannel);
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return;
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}
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/*
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* Start the process of binding this offer to the driver
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* We need to set the DeviceObject field before calling
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* vmbus_child_dev_add()
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*/
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newchannel->device_obj = vmbus_device_create(
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&newchannel->offermsg.offer.if_type,
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&newchannel->offermsg.offer.if_instance,
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newchannel);
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/*
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* Add the new device to the bus. This will kick off device-driver
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* binding which eventually invokes the device driver's AddDevice()
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* method.
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*/
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ret = vmbus_device_register(newchannel->device_obj);
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if (ret != 0) {
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pr_err("unable to add child device object (relid %d)\n",
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newchannel->offermsg.child_relid);
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spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
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list_del(&newchannel->listentry);
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spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
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kfree(newchannel->device_obj);
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free_channel(newchannel);
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} else {
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/*
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* This state is used to indicate a successful open
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* so that when we do close the channel normally, we
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* can cleanup properly
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*/
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newchannel->state = CHANNEL_OPEN_STATE;
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}
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}
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enum {
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IDE = 0,
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SCSI,
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NIC,
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MAX_PERF_CHN,
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};
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/*
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* This is an array of device_ids (device types) that are performance critical.
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* We attempt to distribute the interrupt load for these devices across
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* all available CPUs.
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*/
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static const struct hv_vmbus_device_id hp_devs[] = {
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/* IDE */
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{ HV_IDE_GUID, },
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/* Storage - SCSI */
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{ HV_SCSI_GUID, },
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/* Network */
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{ HV_NIC_GUID, },
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};
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/*
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* We use this state to statically distribute the channel interrupt load.
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*/
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static u32 next_vp;
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/*
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* Starting with Win8, we can statically distribute the incoming
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* channel interrupt load by binding a channel to VCPU. We
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* implement here a simple round robin scheme for distributing
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* the interrupt load.
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* We will bind channels that are not performance critical to cpu 0 and
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* performance critical channels (IDE, SCSI and Network) will be uniformly
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* distributed across all available CPUs.
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*/
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static u32 get_vp_index(uuid_le *type_guid)
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{
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u32 cur_cpu;
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int i;
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bool perf_chn = false;
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u32 max_cpus = num_online_cpus();
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for (i = IDE; i < MAX_PERF_CHN; i++) {
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if (!memcmp(type_guid->b, hp_devs[i].guid,
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sizeof(uuid_le))) {
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perf_chn = true;
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break;
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}
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}
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if ((vmbus_proto_version == VERSION_WS2008) ||
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(vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) {
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/*
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* Prior to win8, all channel interrupts are
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* delivered on cpu 0.
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* Also if the channel is not a performance critical
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* channel, bind it to cpu 0.
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*/
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return 0;
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}
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cur_cpu = (++next_vp % max_cpus);
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return cur_cpu;
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}
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/*
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* vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
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*
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*/
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static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
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{
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struct vmbus_channel_offer_channel *offer;
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struct vmbus_channel *newchannel;
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offer = (struct vmbus_channel_offer_channel *)hdr;
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/* Allocate the channel object and save this offer. */
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newchannel = alloc_channel();
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if (!newchannel) {
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pr_err("Unable to allocate channel object\n");
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return;
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}
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/*
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* By default we setup state to enable batched
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* reading. A specific service can choose to
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* disable this prior to opening the channel.
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*/
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newchannel->batched_reading = true;
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/*
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* Setup state for signalling the host.
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*/
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newchannel->sig_event = (struct hv_input_signal_event *)
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(ALIGN((unsigned long)
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&newchannel->sig_buf,
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HV_HYPERCALL_PARAM_ALIGN));
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newchannel->sig_event->connectionid.asu32 = 0;
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newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID;
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newchannel->sig_event->flag_number = 0;
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newchannel->sig_event->rsvdz = 0;
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if (vmbus_proto_version != VERSION_WS2008) {
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newchannel->is_dedicated_interrupt =
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(offer->is_dedicated_interrupt != 0);
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newchannel->sig_event->connectionid.u.id =
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offer->connection_id;
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}
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newchannel->target_vp = get_vp_index(&offer->offer.if_type);
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memcpy(&newchannel->offermsg, offer,
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sizeof(struct vmbus_channel_offer_channel));
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newchannel->monitor_grp = (u8)offer->monitorid / 32;
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newchannel->monitor_bit = (u8)offer->monitorid % 32;
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INIT_WORK(&newchannel->work, vmbus_process_offer);
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queue_work(newchannel->controlwq, &newchannel->work);
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}
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/*
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* vmbus_onoffer_rescind - Rescind offer handler.
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*
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* We queue a work item to process this offer synchronously
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*/
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static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
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{
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struct vmbus_channel_rescind_offer *rescind;
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struct vmbus_channel *channel;
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rescind = (struct vmbus_channel_rescind_offer *)hdr;
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channel = relid2channel(rescind->child_relid);
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if (channel == NULL)
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/* Just return here, no channel found */
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return;
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/* work is initialized for vmbus_process_rescind_offer() from
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* vmbus_process_offer() where the channel got created */
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queue_work(channel->controlwq, &channel->work);
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}
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/*
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* vmbus_onoffers_delivered -
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* This is invoked when all offers have been delivered.
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*
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* Nothing to do here.
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*/
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static void vmbus_onoffers_delivered(
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struct vmbus_channel_message_header *hdr)
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{
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}
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/*
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* vmbus_onopen_result - Open result handler.
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*
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* This is invoked when we received a response to our channel open request.
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* Find the matching request, copy the response and signal the requesting
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* thread.
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*/
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static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
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{
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struct vmbus_channel_open_result *result;
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struct vmbus_channel_msginfo *msginfo;
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struct vmbus_channel_message_header *requestheader;
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struct vmbus_channel_open_channel *openmsg;
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unsigned long flags;
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result = (struct vmbus_channel_open_result *)hdr;
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/*
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* Find the open msg, copy the result and signal/unblock the wait event
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*/
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
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msglistentry) {
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requestheader =
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(struct vmbus_channel_message_header *)msginfo->msg;
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if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
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openmsg =
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(struct vmbus_channel_open_channel *)msginfo->msg;
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if (openmsg->child_relid == result->child_relid &&
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openmsg->openid == result->openid) {
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memcpy(&msginfo->response.open_result,
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result,
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sizeof(
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struct vmbus_channel_open_result));
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complete(&msginfo->waitevent);
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break;
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}
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}
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}
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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}
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/*
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* vmbus_ongpadl_created - GPADL created handler.
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*
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* This is invoked when we received a response to our gpadl create request.
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* Find the matching request, copy the response and signal the requesting
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* thread.
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*/
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static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
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{
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struct vmbus_channel_gpadl_created *gpadlcreated;
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struct vmbus_channel_msginfo *msginfo;
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struct vmbus_channel_message_header *requestheader;
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struct vmbus_channel_gpadl_header *gpadlheader;
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unsigned long flags;
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gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
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/*
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* Find the establish msg, copy the result and signal/unblock the wait
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* event
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*/
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
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msglistentry) {
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requestheader =
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(struct vmbus_channel_message_header *)msginfo->msg;
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if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
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gpadlheader =
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(struct vmbus_channel_gpadl_header *)requestheader;
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if ((gpadlcreated->child_relid ==
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gpadlheader->child_relid) &&
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(gpadlcreated->gpadl == gpadlheader->gpadl)) {
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memcpy(&msginfo->response.gpadl_created,
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gpadlcreated,
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sizeof(
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struct vmbus_channel_gpadl_created));
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complete(&msginfo->waitevent);
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break;
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}
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}
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}
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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}
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/*
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* vmbus_ongpadl_torndown - GPADL torndown handler.
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*
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* This is invoked when we received a response to our gpadl teardown request.
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* Find the matching request, copy the response and signal the requesting
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* thread.
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*/
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static void vmbus_ongpadl_torndown(
|
|
struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_gpadl_torndown *gpadl_torndown;
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
struct vmbus_channel_message_header *requestheader;
|
|
struct vmbus_channel_gpadl_teardown *gpadl_teardown;
|
|
unsigned long flags;
|
|
|
|
gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
|
|
|
|
/*
|
|
* Find the open msg, copy the result and signal/unblock the wait event
|
|
*/
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
|
|
msglistentry) {
|
|
requestheader =
|
|
(struct vmbus_channel_message_header *)msginfo->msg;
|
|
|
|
if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
|
|
gpadl_teardown =
|
|
(struct vmbus_channel_gpadl_teardown *)requestheader;
|
|
|
|
if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
|
|
memcpy(&msginfo->response.gpadl_torndown,
|
|
gpadl_torndown,
|
|
sizeof(
|
|
struct vmbus_channel_gpadl_torndown));
|
|
complete(&msginfo->waitevent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* vmbus_onversion_response - Version response handler
|
|
*
|
|
* This is invoked when we received a response to our initiate contact request.
|
|
* Find the matching request, copy the response and signal the requesting
|
|
* thread.
|
|
*/
|
|
static void vmbus_onversion_response(
|
|
struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
struct vmbus_channel_message_header *requestheader;
|
|
struct vmbus_channel_version_response *version_response;
|
|
unsigned long flags;
|
|
|
|
version_response = (struct vmbus_channel_version_response *)hdr;
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
|
|
msglistentry) {
|
|
requestheader =
|
|
(struct vmbus_channel_message_header *)msginfo->msg;
|
|
|
|
if (requestheader->msgtype ==
|
|
CHANNELMSG_INITIATE_CONTACT) {
|
|
memcpy(&msginfo->response.version_response,
|
|
version_response,
|
|
sizeof(struct vmbus_channel_version_response));
|
|
complete(&msginfo->waitevent);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
}
|
|
|
|
/* Channel message dispatch table */
|
|
static struct vmbus_channel_message_table_entry
|
|
channel_message_table[CHANNELMSG_COUNT] = {
|
|
{CHANNELMSG_INVALID, NULL},
|
|
{CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
|
|
{CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
|
|
{CHANNELMSG_REQUESTOFFERS, NULL},
|
|
{CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
|
|
{CHANNELMSG_OPENCHANNEL, NULL},
|
|
{CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
|
|
{CHANNELMSG_CLOSECHANNEL, NULL},
|
|
{CHANNELMSG_GPADL_HEADER, NULL},
|
|
{CHANNELMSG_GPADL_BODY, NULL},
|
|
{CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
|
|
{CHANNELMSG_GPADL_TEARDOWN, NULL},
|
|
{CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
|
|
{CHANNELMSG_RELID_RELEASED, NULL},
|
|
{CHANNELMSG_INITIATE_CONTACT, NULL},
|
|
{CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
|
|
{CHANNELMSG_UNLOAD, NULL},
|
|
};
|
|
|
|
/*
|
|
* vmbus_onmessage - Handler for channel protocol messages.
|
|
*
|
|
* This is invoked in the vmbus worker thread context.
|
|
*/
|
|
void vmbus_onmessage(void *context)
|
|
{
|
|
struct hv_message *msg = context;
|
|
struct vmbus_channel_message_header *hdr;
|
|
int size;
|
|
|
|
hdr = (struct vmbus_channel_message_header *)msg->u.payload;
|
|
size = msg->header.payload_size;
|
|
|
|
if (hdr->msgtype >= CHANNELMSG_COUNT) {
|
|
pr_err("Received invalid channel message type %d size %d\n",
|
|
hdr->msgtype, size);
|
|
print_hex_dump_bytes("", DUMP_PREFIX_NONE,
|
|
(unsigned char *)msg->u.payload, size);
|
|
return;
|
|
}
|
|
|
|
if (channel_message_table[hdr->msgtype].message_handler)
|
|
channel_message_table[hdr->msgtype].message_handler(hdr);
|
|
else
|
|
pr_err("Unhandled channel message type %d\n", hdr->msgtype);
|
|
}
|
|
|
|
/*
|
|
* vmbus_request_offers - Send a request to get all our pending offers.
|
|
*/
|
|
int vmbus_request_offers(void)
|
|
{
|
|
struct vmbus_channel_message_header *msg;
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
int ret, t;
|
|
|
|
msginfo = kmalloc(sizeof(*msginfo) +
|
|
sizeof(struct vmbus_channel_message_header),
|
|
GFP_KERNEL);
|
|
if (!msginfo)
|
|
return -ENOMEM;
|
|
|
|
init_completion(&msginfo->waitevent);
|
|
|
|
msg = (struct vmbus_channel_message_header *)msginfo->msg;
|
|
|
|
msg->msgtype = CHANNELMSG_REQUESTOFFERS;
|
|
|
|
|
|
ret = vmbus_post_msg(msg,
|
|
sizeof(struct vmbus_channel_message_header));
|
|
if (ret != 0) {
|
|
pr_err("Unable to request offers - %d\n", ret);
|
|
|
|
goto cleanup;
|
|
}
|
|
|
|
t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
|
|
if (t == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto cleanup;
|
|
}
|
|
|
|
|
|
|
|
cleanup:
|
|
kfree(msginfo);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* eof */
|