/*
*
* 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/vmalloc.h>
#include "include/logging.h"
#include "VmbusPrivate.h"
/* Globals */
struct VMBUS_CONNECTION gVmbusConnection = {
.ConnectState = Disconnected,
.NextGpadlHandle = ATOMIC_INIT(0xE1E10),
};
/*++
Name:
VmbusConnect()
Description:
Sends a connect request on the partition service connection
--*/
int VmbusConnect(void)
{
int ret=0;
VMBUS_CHANNEL_MSGINFO *msgInfo=NULL;
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;
}
INITIALIZE_LIST_HEAD(&gVmbusConnection.ChannelMsgList);
spin_lock_init(&gVmbusConnection.channelmsg_lock);
INITIALIZE_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(VMBUS_CHANNEL_MSGINFO) + sizeof(VMBUS_CHANNEL_INITIATE_CONTACT), GFP_KERNEL);
if (msgInfo == NULL)
{
ret = -1;
goto Cleanup;
}
msgInfo->WaitEvent = osd_WaitEventCreate();
msg = (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);
INSERT_TAIL_LIST(&gVmbusConnection.ChannelMsgList, &msgInfo->MsgListEntry);
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(VMBUS_CHANNEL_INITIATE_CONTACT));
if (ret != 0)
{
REMOVE_ENTRY_LIST(&msgInfo->MsgListEntry);
goto Cleanup;
}
/* Wait for the connection response */
osd_WaitEventWait(msgInfo->WaitEvent);
REMOVE_ENTRY_LIST(&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)
{
if (msgInfo->WaitEvent)
kfree(msgInfo->WaitEvent);
kfree(msgInfo);
}
DPRINT_EXIT(VMBUS);
return ret;
}
/*++
Name:
VmbusDisconnect()
Description:
Sends a disconnect request on the partition service connection
--*/
int VmbusDisconnect(void)
{
int ret=0;
VMBUS_CHANNEL_UNLOAD *msg;
DPRINT_ENTER(VMBUS);
/* Make sure we are connected */
if (gVmbusConnection.ConnectState != Connected)
return -1;
msg = kzalloc(sizeof(VMBUS_CHANNEL_UNLOAD), GFP_KERNEL);
msg->MessageType = ChannelMessageUnload;
ret = VmbusPostMessage(msg, sizeof(VMBUS_CHANNEL_UNLOAD));
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:
if (msg)
{
kfree(msg);
}
DPRINT_EXIT(VMBUS);
return ret;
}
/*++
Name:
GetChannelFromRelId()
Description:
Get the channel object given its child relative id (ie channel id)
--*/
VMBUS_CHANNEL *GetChannelFromRelId(u32 relId)
{
VMBUS_CHANNEL* channel;
VMBUS_CHANNEL* foundChannel=NULL;
LIST_ENTRY* anchor;
LIST_ENTRY* curr;
unsigned long flags;
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelList)
{
channel = CONTAINING_RECORD(curr, VMBUS_CHANNEL, ListEntry);
if (channel->OfferMsg.ChildRelId == relId)
{
foundChannel = channel;
break;
}
}
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
return foundChannel;
}
/*++
Name:
VmbusProcessChannelEvent()
Description:
Process a channel event notification
--*/
static void
VmbusProcessChannelEvent(
void * context
)
{
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);
}
}
/*++
Name:
VmbusOnEvents()
Description:
Handler for events
--*/
void VmbusOnEvents(void)
{
int dword;
/* int maxdword = PAGE_SIZE >> 3; // receive size is 1/2 page and divide that by 4 bytes */
int maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
int bit;
int relid;
u32* recvInterruptPage = gVmbusConnection.RecvInterruptPage;
/* VMBUS_CHANNEL_MESSAGE* receiveMsg; */
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;
}
/*++
Name:
VmbusPostMessage()
Description:
Send a msg on the vmbus's message connection
--*/
int VmbusPostMessage(void *buffer, size_t bufferLen)
{
int ret=0;
HV_CONNECTION_ID connId;
connId.Asu32 =0;
connId.u.Id = VMBUS_MESSAGE_CONNECTION_ID;
ret = HvPostMessage(
connId,
1,
buffer,
bufferLen);
return ret;
}
/*++
Name:
VmbusSetEvent()
Description:
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;
}
/* EOF */
