2897a563a5
The current code unnecessarily limits the number of offers we handle. Get rid of this limitation. As part of this cleanup, also get rid of an unused define - MAX_MSG_TYPES. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
571 lines
16 KiB
C
571 lines
16 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. This response can
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* come from both the vmbus driver and the hv_utils driver. The current api
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* will respond properly to both Windows 2008 and Windows 2008-R2 operating
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* systems.
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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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{
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if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
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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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if (negop->icframe_vercnt == 2 &&
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negop->icversion_data[1].major == 3) {
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negop->icversion_data[0].major = 3;
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negop->icversion_data[0].minor = 0;
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negop->icversion_data[1].major = 3;
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negop->icversion_data[1].minor = 0;
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} else {
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negop->icversion_data[0].major = 1;
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negop->icversion_data[0].minor = 0;
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negop->icversion_data[1].major = 1;
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negop->icversion_data[1].minor = 0;
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}
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negop->icframe_vercnt = 1;
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negop->icmsg_vercnt = 1;
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}
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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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vmbus_device_unregister(channel->device_obj);
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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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/*
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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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uuid_le *guidtype;
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uuid_le *guidinstance;
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offer = (struct vmbus_channel_offer_channel *)hdr;
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guidtype = &offer->offer.if_type;
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guidinstance = &offer->offer.if_instance;
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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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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(
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struct vmbus_channel_message_header *hdr)
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{
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struct vmbus_channel_gpadl_torndown *gpadl_torndown;
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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_teardown *gpadl_teardown;
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unsigned long flags;
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gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)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_GPADL_TEARDOWN) {
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gpadl_teardown =
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(struct vmbus_channel_gpadl_teardown *)requestheader;
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if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
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memcpy(&msginfo->response.gpadl_torndown,
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gpadl_torndown,
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sizeof(
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struct vmbus_channel_gpadl_torndown));
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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_onversion_response - Version response handler
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*
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* This is invoked when we received a response to our initiate contact 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_onversion_response(
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struct vmbus_channel_message_header *hdr)
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{
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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_initiate_contact *initiate;
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struct vmbus_channel_version_response *version_response;
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unsigned long flags;
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version_response = (struct vmbus_channel_version_response *)hdr;
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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 ==
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CHANNELMSG_INITIATE_CONTACT) {
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initiate =
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(struct vmbus_channel_initiate_contact *)requestheader;
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memcpy(&msginfo->response.version_response,
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version_response,
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sizeof(struct vmbus_channel_version_response));
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complete(&msginfo->waitevent);
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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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/* Channel message dispatch table */
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static struct vmbus_channel_message_table_entry
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channel_message_table[CHANNELMSG_COUNT] = {
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{CHANNELMSG_INVALID, NULL},
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{CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
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{CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
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{CHANNELMSG_REQUESTOFFERS, NULL},
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{CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
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{CHANNELMSG_OPENCHANNEL, NULL},
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{CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
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{CHANNELMSG_CLOSECHANNEL, NULL},
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{CHANNELMSG_GPADL_HEADER, NULL},
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{CHANNELMSG_GPADL_BODY, NULL},
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{CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
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{CHANNELMSG_GPADL_TEARDOWN, NULL},
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{CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
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{CHANNELMSG_RELID_RELEASED, NULL},
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{CHANNELMSG_INITIATE_CONTACT, NULL},
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{CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
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{CHANNELMSG_UNLOAD, NULL},
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};
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/*
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* vmbus_onmessage - Handler for channel protocol messages.
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*
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* 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 */
|