331 lines
8.4 KiB
C
331 lines
8.4 KiB
C
/*
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*
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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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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "osd.h"
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#include "logging.h"
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#include "vmbus_private.h"
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struct VMBUS_CONNECTION vmbus_connection = {
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.ConnectState = Disconnected,
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.NextGpadlHandle = ATOMIC_INIT(0xE1E10),
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};
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/*
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* VmbusConnect - Sends a connect request on the partition service connection
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*/
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int VmbusConnect(void)
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{
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int ret = 0;
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struct vmbus_channel_msginfo *msginfo = NULL;
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struct vmbus_channel_initiate_contact *msg;
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unsigned long flags;
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/* Make sure we are not connecting or connected */
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if (vmbus_connection.ConnectState != Disconnected)
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return -1;
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/* Initialize the vmbus connection */
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vmbus_connection.ConnectState = Connecting;
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vmbus_connection.WorkQueue = create_workqueue("hv_vmbus_con");
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if (!vmbus_connection.WorkQueue) {
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ret = -1;
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goto Cleanup;
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}
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INIT_LIST_HEAD(&vmbus_connection.ChannelMsgList);
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spin_lock_init(&vmbus_connection.channelmsg_lock);
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INIT_LIST_HEAD(&vmbus_connection.ChannelList);
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spin_lock_init(&vmbus_connection.channel_lock);
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/*
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* Setup the vmbus event connection for channel interrupt
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* abstraction stuff
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*/
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vmbus_connection.InterruptPage = osd_page_alloc(1);
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if (vmbus_connection.InterruptPage == NULL) {
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ret = -1;
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goto Cleanup;
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}
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vmbus_connection.RecvInterruptPage = vmbus_connection.InterruptPage;
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vmbus_connection.SendInterruptPage =
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(void *)((unsigned long)vmbus_connection.InterruptPage +
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(PAGE_SIZE >> 1));
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/*
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* Setup the monitor notification facility. The 1st page for
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* parent->child and the 2nd page for child->parent
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*/
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vmbus_connection.MonitorPages = osd_page_alloc(2);
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if (vmbus_connection.MonitorPages == NULL) {
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ret = -1;
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goto Cleanup;
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}
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msginfo = kzalloc(sizeof(*msginfo) +
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sizeof(struct vmbus_channel_initiate_contact),
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GFP_KERNEL);
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if (msginfo == NULL) {
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ret = -ENOMEM;
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goto Cleanup;
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}
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msginfo->waitevent = osd_waitevent_create();
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if (!msginfo->waitevent) {
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ret = -ENOMEM;
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goto Cleanup;
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}
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msg = (struct vmbus_channel_initiate_contact *)msginfo->msg;
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msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
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msg->vmbus_version_requested = VMBUS_REVISION_NUMBER;
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msg->interrupt_page = virt_to_phys(vmbus_connection.InterruptPage);
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msg->monitor_page1 = virt_to_phys(vmbus_connection.MonitorPages);
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msg->monitor_page2 = virt_to_phys(
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(void *)((unsigned long)vmbus_connection.MonitorPages +
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PAGE_SIZE));
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/*
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* Add to list before we send the request since we may
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* receive the response before returning from this routine
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*/
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_add_tail(&msginfo->msglistentry,
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&vmbus_connection.ChannelMsgList);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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DPRINT_DBG(VMBUS, "Vmbus connection - interrupt pfn %llx, "
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"monitor1 pfn %llx,, monitor2 pfn %llx",
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msg->interrupt_page, msg->monitor_page1, msg->monitor_page2);
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DPRINT_DBG(VMBUS, "Sending channel initiate msg...");
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ret = VmbusPostMessage(msg,
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sizeof(struct vmbus_channel_initiate_contact));
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if (ret != 0) {
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list_del(&msginfo->msglistentry);
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goto Cleanup;
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}
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/* Wait for the connection response */
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osd_waitevent_wait(msginfo->waitevent);
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list_del(&msginfo->msglistentry);
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/* Check if successful */
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if (msginfo->response.version_response.version_supported) {
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DPRINT_INFO(VMBUS, "Vmbus connected!!");
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vmbus_connection.ConnectState = Connected;
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} else {
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DPRINT_ERR(VMBUS, "Vmbus connection failed!!..."
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"current version (%d) not supported",
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VMBUS_REVISION_NUMBER);
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ret = -1;
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goto Cleanup;
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}
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kfree(msginfo->waitevent);
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kfree(msginfo);
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return 0;
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Cleanup:
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vmbus_connection.ConnectState = Disconnected;
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if (vmbus_connection.WorkQueue)
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destroy_workqueue(vmbus_connection.WorkQueue);
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if (vmbus_connection.InterruptPage) {
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osd_page_free(vmbus_connection.InterruptPage, 1);
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vmbus_connection.InterruptPage = NULL;
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}
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if (vmbus_connection.MonitorPages) {
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osd_page_free(vmbus_connection.MonitorPages, 2);
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vmbus_connection.MonitorPages = NULL;
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}
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if (msginfo) {
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kfree(msginfo->waitevent);
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kfree(msginfo);
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}
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return ret;
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}
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/*
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* VmbusDisconnect - Sends a disconnect request on the partition service connection
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*/
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int VmbusDisconnect(void)
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{
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int ret = 0;
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struct vmbus_channel_message_header *msg;
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/* Make sure we are connected */
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if (vmbus_connection.ConnectState != Connected)
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return -1;
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msg = kzalloc(sizeof(struct vmbus_channel_message_header), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->msgtype = CHANNELMSG_UNLOAD;
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ret = VmbusPostMessage(msg,
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sizeof(struct vmbus_channel_message_header));
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if (ret != 0)
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goto Cleanup;
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osd_page_free(vmbus_connection.InterruptPage, 1);
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/* TODO: iterate thru the msg list and free up */
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destroy_workqueue(vmbus_connection.WorkQueue);
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vmbus_connection.ConnectState = Disconnected;
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DPRINT_INFO(VMBUS, "Vmbus disconnected!!");
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Cleanup:
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kfree(msg);
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return ret;
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}
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/*
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* GetChannelFromRelId - Get the channel object given its child relative id (ie channel id)
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*/
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struct vmbus_channel *GetChannelFromRelId(u32 relid)
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{
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struct vmbus_channel *channel;
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struct vmbus_channel *found_channel = NULL;
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unsigned long flags;
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spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
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list_for_each_entry(channel, &vmbus_connection.ChannelList, listentry) {
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if (channel->offermsg.child_relid == relid) {
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found_channel = channel;
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break;
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}
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}
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spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
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return found_channel;
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}
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/*
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* VmbusProcessChannelEvent - Process a channel event notification
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*/
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static void VmbusProcessChannelEvent(void *context)
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{
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struct vmbus_channel *channel;
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u32 relid = (u32)(unsigned long)context;
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/* ASSERT(relId > 0); */
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/*
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* Find the channel based on this relid and invokes the
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* channel callback to process the event
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*/
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channel = GetChannelFromRelId(relid);
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if (channel) {
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vmbus_onchannel_event(channel);
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/*
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* WorkQueueQueueWorkItem(channel->dataWorkQueue,
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* vmbus_onchannel_event,
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* (void*)channel);
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*/
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} else {
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DPRINT_ERR(VMBUS, "channel not found for relid - %d.", relid);
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}
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}
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/*
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* VmbusOnEvents - Handler for events
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*/
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void VmbusOnEvents(void)
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{
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int dword;
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int maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
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int bit;
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int relid;
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u32 *recv_int_page = vmbus_connection.RecvInterruptPage;
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/* Check events */
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if (recv_int_page) {
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for (dword = 0; dword < maxdword; dword++) {
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if (recv_int_page[dword]) {
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for (bit = 0; bit < 32; bit++) {
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if (test_and_clear_bit(bit,
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(unsigned long *)
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&recv_int_page[dword])) {
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relid = (dword << 5) + bit;
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DPRINT_DBG(VMBUS, "event detected for relid - %d", relid);
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if (relid == 0) {
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/* special case - vmbus channel protocol msg */
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DPRINT_DBG(VMBUS, "invalid relid - %d", relid);
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continue;
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} else {
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/* QueueWorkItem(VmbusProcessEvent, (void*)relid); */
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/* ret = WorkQueueQueueWorkItem(gVmbusConnection.workQueue, VmbusProcessChannelEvent, (void*)relid); */
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VmbusProcessChannelEvent((void *)(unsigned long)relid);
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}
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}
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}
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}
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}
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}
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return;
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}
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/*
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* VmbusPostMessage - Send a msg on the vmbus's message connection
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*/
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int VmbusPostMessage(void *buffer, size_t buflen)
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{
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union hv_connection_id conn_id;
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conn_id.asu32 = 0;
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conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;
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return hv_post_message(conn_id, 1, buffer, buflen);
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}
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/*
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* VmbusSetEvent - Send an event notification to the parent
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*/
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int VmbusSetEvent(u32 child_relid)
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{
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/* Each u32 represents 32 channels */
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set_bit(child_relid & 31,
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(unsigned long *)vmbus_connection.SendInterruptPage +
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(child_relid >> 5));
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return hv_signal_event();
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}
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