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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Dexuan Cui](/assets/img/avatar_default.png)
This fixes the recent commit 3b71107d73
:
Drivers: hv: vmbus: Further improve CPU affiliation logic
Without the fix, reloading hv_netvsc hangs the guest.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
961 lines
25 KiB
C
961 lines
25 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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static void init_vp_index(struct vmbus_channel *channel,
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const uuid_le *type_guid);
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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 fw_version specifies the framework version that
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* we can support and srv_version specifies the service
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* version we can support.
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*
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* Mainly used by Hyper-V drivers.
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*/
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bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
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struct icmsg_negotiate *negop, u8 *buf,
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int fw_version, int srv_version)
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{
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int icframe_major, icframe_minor;
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int icmsg_major, icmsg_minor;
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int fw_major, fw_minor;
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int srv_major, srv_minor;
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int i;
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bool found_match = false;
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icmsghdrp->icmsgsize = 0x10;
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fw_major = (fw_version >> 16);
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fw_minor = (fw_version & 0xFFFF);
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srv_major = (srv_version >> 16);
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srv_minor = (srv_version & 0xFFFF);
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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_major = negop->icframe_vercnt;
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icframe_minor = 0;
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icmsg_major = negop->icmsg_vercnt;
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icmsg_minor = 0;
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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 == fw_major) &&
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(negop->icversion_data[i].minor == fw_minor)) {
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icframe_major = negop->icversion_data[i].major;
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icframe_minor = negop->icversion_data[i].minor;
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found_match = true;
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}
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}
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if (!found_match)
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goto fw_error;
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found_match = false;
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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 == srv_major) &&
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(negop->icversion_data[i].minor == srv_minor)) {
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icmsg_major = negop->icversion_data[i].major;
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icmsg_minor = negop->icversion_data[i].minor;
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found_match = true;
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}
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}
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/*
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* Respond with the framework and service
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* version numbers we can support.
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*/
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fw_error:
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if (!found_match) {
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negop->icframe_vercnt = 0;
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negop->icmsg_vercnt = 0;
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} else {
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negop->icframe_vercnt = 1;
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negop->icmsg_vercnt = 1;
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}
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negop->icversion_data[0].major = icframe_major;
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negop->icversion_data[0].minor = icframe_minor;
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negop->icversion_data[1].major = icmsg_major;
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negop->icversion_data[1].minor = icmsg_minor;
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return found_match;
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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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static atomic_t chan_num = ATOMIC_INIT(0);
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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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channel->id = atomic_inc_return(&chan_num);
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spin_lock_init(&channel->inbound_lock);
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spin_lock_init(&channel->lock);
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INIT_LIST_HEAD(&channel->sc_list);
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INIT_LIST_HEAD(&channel->percpu_list);
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return 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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kfree(channel);
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}
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static void percpu_channel_enq(void *arg)
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{
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struct vmbus_channel *channel = arg;
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int cpu = smp_processor_id();
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list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]);
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}
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static void percpu_channel_deq(void *arg)
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{
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struct vmbus_channel *channel = arg;
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list_del(&channel->percpu_list);
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}
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void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
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{
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struct vmbus_channel_relid_released msg;
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unsigned long flags;
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struct vmbus_channel *primary_channel;
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memset(&msg, 0, sizeof(struct vmbus_channel_relid_released));
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msg.child_relid = 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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if (channel == NULL)
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return;
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if (channel->target_cpu != get_cpu()) {
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put_cpu();
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smp_call_function_single(channel->target_cpu,
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percpu_channel_deq, channel, true);
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} else {
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percpu_channel_deq(channel);
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put_cpu();
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}
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if (channel->primary_channel == NULL) {
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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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primary_channel = channel;
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} else {
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primary_channel = channel->primary_channel;
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spin_lock_irqsave(&primary_channel->lock, flags);
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list_del(&channel->sc_list);
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primary_channel->num_sc--;
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spin_unlock_irqrestore(&primary_channel->lock, flags);
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}
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/*
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* We need to free the bit for init_vp_index() to work in the case
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* of sub-channel, when we reload drivers like hv_netvsc.
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*/
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cpumask_clear_cpu(channel->target_cpu,
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&primary_channel->alloced_cpus_in_node);
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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, *tmp;
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list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list,
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listentry) {
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/* if we don't set rescind to true, vmbus_close_internal()
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* won't invoke hv_process_channel_removal().
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*/
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channel->rescind = true;
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vmbus_device_unregister(channel->device_obj);
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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 vmbus_channel *newchannel)
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{
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struct vmbus_channel *channel;
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bool fnew = true;
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unsigned long flags;
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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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/*
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* Check to see if this is a sub-channel.
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*/
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if (newchannel->offermsg.offer.sub_channel_index != 0) {
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/*
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* Process the sub-channel.
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*/
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newchannel->primary_channel = channel;
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spin_lock_irqsave(&channel->lock, flags);
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list_add_tail(&newchannel->sc_list, &channel->sc_list);
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channel->num_sc++;
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spin_unlock_irqrestore(&channel->lock, flags);
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} else
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goto err_free_chan;
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}
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init_vp_index(newchannel, &newchannel->offermsg.offer.if_type);
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if (newchannel->target_cpu != get_cpu()) {
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put_cpu();
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smp_call_function_single(newchannel->target_cpu,
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percpu_channel_enq,
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newchannel, true);
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} else {
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percpu_channel_enq(newchannel);
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put_cpu();
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}
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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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if (!fnew) {
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if (channel->sc_creation_callback != NULL)
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channel->sc_creation_callback(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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if (!newchannel->device_obj)
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goto err_deq_chan;
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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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if (vmbus_device_register(newchannel->device_obj) != 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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kfree(newchannel->device_obj);
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goto err_deq_chan;
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}
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return;
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err_deq_chan:
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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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if (newchannel->target_cpu != get_cpu()) {
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put_cpu();
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smp_call_function_single(newchannel->target_cpu,
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percpu_channel_deq, newchannel, true);
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} else {
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percpu_channel_deq(newchannel);
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put_cpu();
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}
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err_free_chan:
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free_channel(newchannel);
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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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ND_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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/* NetworkDirect Guest RDMA */
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{ HV_ND_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 int next_numa_node_id;
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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.
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* We do this in a hierarchical fashion:
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* First distribute the primary channels across available NUMA nodes
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* and then distribute the subchannels amongst the CPUs in the NUMA
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* node assigned to the primary channel.
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*
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* For pre-win8 hosts or non-performance critical channels we assign the
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* first CPU in the first NUMA node.
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*/
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static void init_vp_index(struct vmbus_channel *channel, const 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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struct vmbus_channel *primary = channel->primary_channel;
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int next_node;
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struct cpumask available_mask;
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struct cpumask *alloced_mask;
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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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channel->numa_node = 0;
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channel->target_cpu = 0;
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channel->target_vp = hv_context.vp_index[0];
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return;
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}
|
|
|
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/*
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* We distribute primary channels evenly across all the available
|
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* NUMA nodes and within the assigned NUMA node we will assign the
|
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* first available CPU to the primary channel.
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* The sub-channels will be assigned to the CPUs available in the
|
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* NUMA node evenly.
|
|
*/
|
|
if (!primary) {
|
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while (true) {
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next_node = next_numa_node_id++;
|
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if (next_node == nr_node_ids)
|
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next_node = next_numa_node_id = 0;
|
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if (cpumask_empty(cpumask_of_node(next_node)))
|
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continue;
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break;
|
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}
|
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channel->numa_node = next_node;
|
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primary = channel;
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}
|
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alloced_mask = &hv_context.hv_numa_map[primary->numa_node];
|
|
|
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if (cpumask_weight(alloced_mask) ==
|
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cpumask_weight(cpumask_of_node(primary->numa_node))) {
|
|
/*
|
|
* We have cycled through all the CPUs in the node;
|
|
* reset the alloced map.
|
|
*/
|
|
cpumask_clear(alloced_mask);
|
|
}
|
|
|
|
cpumask_xor(&available_mask, alloced_mask,
|
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cpumask_of_node(primary->numa_node));
|
|
|
|
cur_cpu = -1;
|
|
while (true) {
|
|
cur_cpu = cpumask_next(cur_cpu, &available_mask);
|
|
if (cur_cpu >= nr_cpu_ids) {
|
|
cur_cpu = -1;
|
|
cpumask_copy(&available_mask,
|
|
cpumask_of_node(primary->numa_node));
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* NOTE: in the case of sub-channel, we clear the sub-channel
|
|
* related bit(s) in primary->alloced_cpus_in_node in
|
|
* hv_process_channel_removal(), so when we reload drivers
|
|
* like hv_netvsc in SMP guest, here we're able to re-allocate
|
|
* bit from primary->alloced_cpus_in_node.
|
|
*/
|
|
if (!cpumask_test_cpu(cur_cpu,
|
|
&primary->alloced_cpus_in_node)) {
|
|
cpumask_set_cpu(cur_cpu,
|
|
&primary->alloced_cpus_in_node);
|
|
cpumask_set_cpu(cur_cpu, alloced_mask);
|
|
break;
|
|
}
|
|
}
|
|
|
|
channel->target_cpu = cur_cpu;
|
|
channel->target_vp = hv_context.vp_index[cur_cpu];
|
|
}
|
|
|
|
/*
|
|
* vmbus_unload_response - Handler for the unload response.
|
|
*/
|
|
static void vmbus_unload_response(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
/*
|
|
* This is a global event; just wakeup the waiting thread.
|
|
* Once we successfully unload, we can cleanup the monitor state.
|
|
*/
|
|
complete(&vmbus_connection.unload_event);
|
|
}
|
|
|
|
void vmbus_initiate_unload(void)
|
|
{
|
|
struct vmbus_channel_message_header hdr;
|
|
|
|
/* Pre-Win2012R2 hosts don't support reconnect */
|
|
if (vmbus_proto_version < VERSION_WIN8_1)
|
|
return;
|
|
|
|
init_completion(&vmbus_connection.unload_event);
|
|
memset(&hdr, 0, sizeof(struct vmbus_channel_message_header));
|
|
hdr.msgtype = CHANNELMSG_UNLOAD;
|
|
vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header));
|
|
|
|
wait_for_completion(&vmbus_connection.unload_event);
|
|
}
|
|
|
|
/*
|
|
* vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
|
|
*
|
|
*/
|
|
static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_offer_channel *offer;
|
|
struct vmbus_channel *newchannel;
|
|
|
|
offer = (struct vmbus_channel_offer_channel *)hdr;
|
|
|
|
/* Allocate the channel object and save this offer. */
|
|
newchannel = alloc_channel();
|
|
if (!newchannel) {
|
|
pr_err("Unable to allocate channel object\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* By default we setup state to enable batched
|
|
* reading. A specific service can choose to
|
|
* disable this prior to opening the channel.
|
|
*/
|
|
newchannel->batched_reading = true;
|
|
|
|
/*
|
|
* Setup state for signalling the host.
|
|
*/
|
|
newchannel->sig_event = (struct hv_input_signal_event *)
|
|
(ALIGN((unsigned long)
|
|
&newchannel->sig_buf,
|
|
HV_HYPERCALL_PARAM_ALIGN));
|
|
|
|
newchannel->sig_event->connectionid.asu32 = 0;
|
|
newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID;
|
|
newchannel->sig_event->flag_number = 0;
|
|
newchannel->sig_event->rsvdz = 0;
|
|
|
|
if (vmbus_proto_version != VERSION_WS2008) {
|
|
newchannel->is_dedicated_interrupt =
|
|
(offer->is_dedicated_interrupt != 0);
|
|
newchannel->sig_event->connectionid.u.id =
|
|
offer->connection_id;
|
|
}
|
|
|
|
memcpy(&newchannel->offermsg, offer,
|
|
sizeof(struct vmbus_channel_offer_channel));
|
|
newchannel->monitor_grp = (u8)offer->monitorid / 32;
|
|
newchannel->monitor_bit = (u8)offer->monitorid % 32;
|
|
|
|
vmbus_process_offer(newchannel);
|
|
}
|
|
|
|
/*
|
|
* vmbus_onoffer_rescind - Rescind offer handler.
|
|
*
|
|
* We queue a work item to process this offer synchronously
|
|
*/
|
|
static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_rescind_offer *rescind;
|
|
struct vmbus_channel *channel;
|
|
unsigned long flags;
|
|
struct device *dev;
|
|
|
|
rescind = (struct vmbus_channel_rescind_offer *)hdr;
|
|
channel = relid2channel(rescind->child_relid);
|
|
|
|
if (channel == NULL) {
|
|
hv_process_channel_removal(NULL, rescind->child_relid);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&channel->lock, flags);
|
|
channel->rescind = true;
|
|
spin_unlock_irqrestore(&channel->lock, flags);
|
|
|
|
if (channel->device_obj) {
|
|
/*
|
|
* We will have to unregister this device from the
|
|
* driver core.
|
|
*/
|
|
dev = get_device(&channel->device_obj->device);
|
|
if (dev) {
|
|
vmbus_device_unregister(channel->device_obj);
|
|
put_device(dev);
|
|
}
|
|
} else {
|
|
hv_process_channel_removal(channel,
|
|
channel->offermsg.child_relid);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vmbus_onoffers_delivered -
|
|
* This is invoked when all offers have been delivered.
|
|
*
|
|
* Nothing to do here.
|
|
*/
|
|
static void vmbus_onoffers_delivered(
|
|
struct vmbus_channel_message_header *hdr)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* vmbus_onopen_result - Open result handler.
|
|
*
|
|
* This is invoked when we received a response to our channel open request.
|
|
* Find the matching request, copy the response and signal the requesting
|
|
* thread.
|
|
*/
|
|
static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_open_result *result;
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
struct vmbus_channel_message_header *requestheader;
|
|
struct vmbus_channel_open_channel *openmsg;
|
|
unsigned long flags;
|
|
|
|
result = (struct vmbus_channel_open_result *)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_OPENCHANNEL) {
|
|
openmsg =
|
|
(struct vmbus_channel_open_channel *)msginfo->msg;
|
|
if (openmsg->child_relid == result->child_relid &&
|
|
openmsg->openid == result->openid) {
|
|
memcpy(&msginfo->response.open_result,
|
|
result,
|
|
sizeof(
|
|
struct vmbus_channel_open_result));
|
|
complete(&msginfo->waitevent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* vmbus_ongpadl_created - GPADL created handler.
|
|
*
|
|
* This is invoked when we received a response to our gpadl create request.
|
|
* Find the matching request, copy the response and signal the requesting
|
|
* thread.
|
|
*/
|
|
static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_gpadl_created *gpadlcreated;
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
struct vmbus_channel_message_header *requestheader;
|
|
struct vmbus_channel_gpadl_header *gpadlheader;
|
|
unsigned long flags;
|
|
|
|
gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
|
|
|
|
/*
|
|
* Find the establish 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_HEADER) {
|
|
gpadlheader =
|
|
(struct vmbus_channel_gpadl_header *)requestheader;
|
|
|
|
if ((gpadlcreated->child_relid ==
|
|
gpadlheader->child_relid) &&
|
|
(gpadlcreated->gpadl == gpadlheader->gpadl)) {
|
|
memcpy(&msginfo->response.gpadl_created,
|
|
gpadlcreated,
|
|
sizeof(
|
|
struct vmbus_channel_gpadl_created));
|
|
complete(&msginfo->waitevent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* vmbus_ongpadl_torndown - GPADL torndown handler.
|
|
*
|
|
* This is invoked when we received a response to our gpadl teardown request.
|
|
* Find the matching request, copy the response and signal the requesting
|
|
* thread.
|
|
*/
|
|
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 */
|
|
struct vmbus_channel_message_table_entry
|
|
channel_message_table[CHANNELMSG_COUNT] = {
|
|
{CHANNELMSG_INVALID, 0, NULL},
|
|
{CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer},
|
|
{CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind},
|
|
{CHANNELMSG_REQUESTOFFERS, 0, NULL},
|
|
{CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered},
|
|
{CHANNELMSG_OPENCHANNEL, 0, NULL},
|
|
{CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result},
|
|
{CHANNELMSG_CLOSECHANNEL, 0, NULL},
|
|
{CHANNELMSG_GPADL_HEADER, 0, NULL},
|
|
{CHANNELMSG_GPADL_BODY, 0, NULL},
|
|
{CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created},
|
|
{CHANNELMSG_GPADL_TEARDOWN, 0, NULL},
|
|
{CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown},
|
|
{CHANNELMSG_RELID_RELEASED, 0, NULL},
|
|
{CHANNELMSG_INITIATE_CONTACT, 0, NULL},
|
|
{CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response},
|
|
{CHANNELMSG_UNLOAD, 0, NULL},
|
|
{CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response},
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
|
|
msginfo = kmalloc(sizeof(*msginfo) +
|
|
sizeof(struct vmbus_channel_message_header),
|
|
GFP_KERNEL);
|
|
if (!msginfo)
|
|
return -ENOMEM;
|
|
|
|
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;
|
|
}
|
|
|
|
cleanup:
|
|
kfree(msginfo);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Retrieve the (sub) channel on which to send an outgoing request.
|
|
* When a primary channel has multiple sub-channels, we try to
|
|
* distribute the load equally amongst all available channels.
|
|
*/
|
|
struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary)
|
|
{
|
|
struct list_head *cur, *tmp;
|
|
int cur_cpu;
|
|
struct vmbus_channel *cur_channel;
|
|
struct vmbus_channel *outgoing_channel = primary;
|
|
int next_channel;
|
|
int i = 1;
|
|
|
|
if (list_empty(&primary->sc_list))
|
|
return outgoing_channel;
|
|
|
|
next_channel = primary->next_oc++;
|
|
|
|
if (next_channel > (primary->num_sc)) {
|
|
primary->next_oc = 0;
|
|
return outgoing_channel;
|
|
}
|
|
|
|
cur_cpu = hv_context.vp_index[get_cpu()];
|
|
put_cpu();
|
|
list_for_each_safe(cur, tmp, &primary->sc_list) {
|
|
cur_channel = list_entry(cur, struct vmbus_channel, sc_list);
|
|
if (cur_channel->state != CHANNEL_OPENED_STATE)
|
|
continue;
|
|
|
|
if (cur_channel->target_vp == cur_cpu)
|
|
return cur_channel;
|
|
|
|
if (i == next_channel)
|
|
return cur_channel;
|
|
|
|
i++;
|
|
}
|
|
|
|
return outgoing_channel;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel);
|
|
|
|
static void invoke_sc_cb(struct vmbus_channel *primary_channel)
|
|
{
|
|
struct list_head *cur, *tmp;
|
|
struct vmbus_channel *cur_channel;
|
|
|
|
if (primary_channel->sc_creation_callback == NULL)
|
|
return;
|
|
|
|
list_for_each_safe(cur, tmp, &primary_channel->sc_list) {
|
|
cur_channel = list_entry(cur, struct vmbus_channel, sc_list);
|
|
|
|
primary_channel->sc_creation_callback(cur_channel);
|
|
}
|
|
}
|
|
|
|
void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
|
|
void (*sc_cr_cb)(struct vmbus_channel *new_sc))
|
|
{
|
|
primary_channel->sc_creation_callback = sc_cr_cb;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback);
|
|
|
|
bool vmbus_are_subchannels_present(struct vmbus_channel *primary)
|
|
{
|
|
bool ret;
|
|
|
|
ret = !list_empty(&primary->sc_list);
|
|
|
|
if (ret) {
|
|
/*
|
|
* Invoke the callback on sub-channel creation.
|
|
* This will present a uniform interface to the
|
|
* clients.
|
|
*/
|
|
invoke_sc_cb(primary);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present);
|