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/*
*
* Copyright (c) 2009, Microsoft Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Authors:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
*
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include "osd.h"
#include "logging.h"
#include "VmbusPrivate.h"
struct VMBUS_CONNECTION gVmbusConnection = {
.ConnectState = Disconnected,
.NextGpadlHandle = ATOMIC_INIT(0xE1E10),
};
/*
* VmbusConnect - Sends a connect request on the partition service connection
*/
int VmbusConnect(void)
{
int ret = 0;
struct vmbus_channel_msginfo *msgInfo = NULL;
struct vmbus_channel_initiate_contact *msg;
unsigned long flags;
DPRINT_ENTER(VMBUS);
/* Make sure we are not connecting or connected */
if (gVmbusConnection.ConnectState != Disconnected)
return -1;
/* Initialize the vmbus connection */
gVmbusConnection.ConnectState = Connecting;
gVmbusConnection.WorkQueue = create_workqueue("hv_vmbus_con");
if (!gVmbusConnection.WorkQueue) {
ret = -1;
goto Cleanup;
}
INIT_LIST_HEAD(&gVmbusConnection.ChannelMsgList);
spin_lock_init(&gVmbusConnection.channelmsg_lock);
INIT_LIST_HEAD(&gVmbusConnection.ChannelList);
spin_lock_init(&gVmbusConnection.channel_lock);
/*
* Setup the vmbus event connection for channel interrupt
* abstraction stuff
*/
gVmbusConnection.InterruptPage = osd_PageAlloc(1);
if (gVmbusConnection.InterruptPage == NULL) {
ret = -1;
goto Cleanup;
}
gVmbusConnection.RecvInterruptPage = gVmbusConnection.InterruptPage;
gVmbusConnection.SendInterruptPage =
(void *)((unsigned long)gVmbusConnection.InterruptPage +
(PAGE_SIZE >> 1));
/*
* Setup the monitor notification facility. The 1st page for
* parent->child and the 2nd page for child->parent
*/
gVmbusConnection.MonitorPages = osd_PageAlloc(2);
if (gVmbusConnection.MonitorPages == NULL) {
ret = -1;
goto Cleanup;
}
msgInfo = kzalloc(sizeof(*msgInfo) +
sizeof(struct vmbus_channel_initiate_contact),
GFP_KERNEL);
if (msgInfo == NULL) {
ret = -ENOMEM;
goto Cleanup;
}
msgInfo->WaitEvent = osd_WaitEventCreate();
if (!msgInfo->WaitEvent) {
ret = -ENOMEM;
goto Cleanup;
}
msg = (struct vmbus_channel_initiate_contact *)msgInfo->Msg;
msg->Header.MessageType = ChannelMessageInitiateContact;
msg->VMBusVersionRequested = VMBUS_REVISION_NUMBER;
msg->InterruptPage = virt_to_phys(gVmbusConnection.InterruptPage);
msg->MonitorPage1 = virt_to_phys(gVmbusConnection.MonitorPages);
msg->MonitorPage2 = virt_to_phys(
(void *)((unsigned long)gVmbusConnection.MonitorPages +
PAGE_SIZE));
/*
* Add to list before we send the request since we may
* receive the response before returning from this routine
*/
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
list_add_tail(&msgInfo->MsgListEntry,
&gVmbusConnection.ChannelMsgList);
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
DPRINT_DBG(VMBUS, "Vmbus connection - interrupt pfn %llx, "
"monitor1 pfn %llx,, monitor2 pfn %llx",
msg->InterruptPage, msg->MonitorPage1, msg->MonitorPage2);
DPRINT_DBG(VMBUS, "Sending channel initiate msg...");
ret = VmbusPostMessage(msg,
sizeof(struct vmbus_channel_initiate_contact));
if (ret != 0) {
list_del(&msgInfo->MsgListEntry);
goto Cleanup;
}
/* Wait for the connection response */
osd_WaitEventWait(msgInfo->WaitEvent);
list_del(&msgInfo->MsgListEntry);
/* Check if successful */
if (msgInfo->Response.VersionResponse.VersionSupported) {
DPRINT_INFO(VMBUS, "Vmbus connected!!");
gVmbusConnection.ConnectState = Connected;
} else {
DPRINT_ERR(VMBUS, "Vmbus connection failed!!..."
"current version (%d) not supported",
VMBUS_REVISION_NUMBER);
ret = -1;
goto Cleanup;
}
kfree(msgInfo->WaitEvent);
kfree(msgInfo);
DPRINT_EXIT(VMBUS);
return 0;
Cleanup:
gVmbusConnection.ConnectState = Disconnected;
if (gVmbusConnection.WorkQueue)
destroy_workqueue(gVmbusConnection.WorkQueue);
if (gVmbusConnection.InterruptPage) {
osd_PageFree(gVmbusConnection.InterruptPage, 1);
gVmbusConnection.InterruptPage = NULL;
}
if (gVmbusConnection.MonitorPages) {
osd_PageFree(gVmbusConnection.MonitorPages, 2);
gVmbusConnection.MonitorPages = NULL;
}
if (msgInfo) {
kfree(msgInfo->WaitEvent);
kfree(msgInfo);
}
DPRINT_EXIT(VMBUS);
return ret;
}
/*
* VmbusDisconnect - Sends a disconnect request on the partition service connection
*/
int VmbusDisconnect(void)
{
int ret = 0;
struct vmbus_channel_message_header *msg;
DPRINT_ENTER(VMBUS);
/* Make sure we are connected */
if (gVmbusConnection.ConnectState != Connected)
return -1;
msg = kzalloc(sizeof(struct vmbus_channel_message_header), GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg->MessageType = ChannelMessageUnload;
ret = VmbusPostMessage(msg,
sizeof(struct vmbus_channel_message_header));
if (ret != 0)
goto Cleanup;
osd_PageFree(gVmbusConnection.InterruptPage, 1);
/* TODO: iterate thru the msg list and free up */
destroy_workqueue(gVmbusConnection.WorkQueue);
gVmbusConnection.ConnectState = Disconnected;
DPRINT_INFO(VMBUS, "Vmbus disconnected!!");
Cleanup:
kfree(msg);
DPRINT_EXIT(VMBUS);
return ret;
}
/*
* GetChannelFromRelId - Get the channel object given its child relative id (ie channel id)
*/
struct vmbus_channel *GetChannelFromRelId(u32 relId)
{
struct vmbus_channel *channel;
struct vmbus_channel *foundChannel = NULL;
unsigned long flags;
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
list_for_each_entry(channel, &gVmbusConnection.ChannelList, ListEntry) {
if (channel->OfferMsg.ChildRelId == relId) {
foundChannel = channel;
break;
}
}
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
return foundChannel;
}
/*
* VmbusProcessChannelEvent - Process a channel event notification
*/
static void VmbusProcessChannelEvent(void *context)
{
struct vmbus_channel *channel;
u32 relId = (u32)(unsigned long)context;
ASSERT(relId > 0);
/*
* Find the channel based on this relid and invokes the
* channel callback to process the event
*/
channel = GetChannelFromRelId(relId);
if (channel) {
VmbusChannelOnChannelEvent(channel);
/*
* WorkQueueQueueWorkItem(channel->dataWorkQueue,
* VmbusChannelOnChannelEvent,
* (void*)channel);
*/
} else {
DPRINT_ERR(VMBUS, "channel not found for relid - %d.", relId);
}
}
/*
* VmbusOnEvents - Handler for events
*/
void VmbusOnEvents(void)
{
int dword;
int maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
int bit;
int relid;
u32 *recvInterruptPage = gVmbusConnection.RecvInterruptPage;
DPRINT_ENTER(VMBUS);
/* Check events */
if (recvInterruptPage) {
for (dword = 0; dword < maxdword; dword++) {
if (recvInterruptPage[dword]) {
for (bit = 0; bit < 32; bit++) {
if (test_and_clear_bit(bit, (unsigned long *)&recvInterruptPage[dword])) {
relid = (dword << 5) + bit;
DPRINT_DBG(VMBUS, "event detected for relid - %d", relid);
if (relid == 0) {
/* special case - vmbus channel protocol msg */
DPRINT_DBG(VMBUS, "invalid relid - %d", relid);
continue;
} else {
/* QueueWorkItem(VmbusProcessEvent, (void*)relid); */
/* ret = WorkQueueQueueWorkItem(gVmbusConnection.workQueue, VmbusProcessChannelEvent, (void*)relid); */
VmbusProcessChannelEvent((void *)(unsigned long)relid);
}
}
}
}
}
}
DPRINT_EXIT(VMBUS);
return;
}
/*
* VmbusPostMessage - Send a msg on the vmbus's message connection
*/
int VmbusPostMessage(void *buffer, size_t bufferLen)
{
union hv_connection_id connId;
connId.Asu32 = 0;
connId.u.Id = VMBUS_MESSAGE_CONNECTION_ID;
return HvPostMessage(connId, 1, buffer, bufferLen);
}
/*
* VmbusSetEvent - Send an event notification to the parent
*/
int VmbusSetEvent(u32 childRelId)
{
int ret = 0;
DPRINT_ENTER(VMBUS);
/* Each u32 represents 32 channels */
set_bit(childRelId & 31,
(unsigned long *)gVmbusConnection.SendInterruptPage +
(childRelId >> 5));
ret = HvSignalEvent();
DPRINT_EXIT(VMBUS);
return ret;
}
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