Staging: hv: add the Hyper-V virtual bus

This is the virtual bus that all of the Linux Hyper-V drivers use.

Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 170 insertions, 0 deletions

diff --git a/drivers/staging/hv/VmbusPrivate.h b/drivers/staging/hv/VmbusPrivate.h
new file mode 100644
index 000000000000..5e86165dea28
--- /dev/null
+++ b/drivers/staging/hv/VmbusPrivate.h
@@ -0,0 +1,170 @@
+/*
+ *
+ * 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>
+ *
+ */
+
+
+#ifndef _VMBUS_PRIVATE_H_
+#define _VMBUS_PRIVATE_H_
+
+#ifndef INTERNAL
+#define INTERNAL static
+#endif
+
+#include "Hv.h"
+#include "VmbusApi.h"
+#include "Channel.h"
+#include "ChannelMgmt.h"
+#include "ChannelInterface.h"
+//#include "ChannelMessages.h"
+#include "RingBuffer.h"
+//#include "Packet.h"
+#include "List.h"
+
+//
+// Defines
+//
+
+// Maximum channels is determined by the size of the interrupt page which is PAGE_SIZE. 1/2 of PAGE_SIZE is for
+// send endpoint interrupt and the other is receive endpoint interrupt
+#define MAX_NUM_CHANNELS				(PAGE_SIZE >> 1) << 3  // 16348 channels
+
+// The value here must be in multiple of 32
+// TODO: Need to make this configurable
+#define MAX_NUM_CHANNELS_SUPPORTED		256
+
+//
+// Data types
+//
+
+typedef enum {
+	Disconnected,
+	Connecting,
+	Connected,
+	Disconnecting
+} VMBUS_CONNECT_STATE;
+
+#define MAX_SIZE_CHANNEL_MESSAGE			HV_MESSAGE_PAYLOAD_BYTE_COUNT
+
+typedef struct _VMBUS_CONNECTION {
+
+	VMBUS_CONNECT_STATE					ConnectState;
+
+	UINT32								NextGpadlHandle;
+
+	// Represents channel interrupts. Each bit position
+	// represents a channel.
+	// When a channel sends an interrupt via VMBUS, it
+	// finds its bit in the sendInterruptPage, set it and
+	// calls Hv to generate a port event. The other end
+	// receives the port event and parse the recvInterruptPage
+	// to see which bit is set
+	VOID*								InterruptPage;
+	VOID*								SendInterruptPage;
+	VOID*								RecvInterruptPage;
+
+	// 2 pages - 1st page for parent->child notification and 2nd is child->parent notification
+	VOID*								MonitorPages;
+	LIST_ENTRY							ChannelMsgList;
+	HANDLE								ChannelMsgLock;
+
+	// List of channels
+	LIST_ENTRY							ChannelList;
+	HANDLE								ChannelLock;
+
+	HANDLE								WorkQueue;
+} VMBUS_CONNECTION;
+
+
+typedef struct _VMBUS_MSGINFO {
+	// Bookkeeping stuff
+	LIST_ENTRY			MsgListEntry;
+
+	// Synchronize the request/response if needed
+	HANDLE				WaitEvent;
+
+	// The message itself
+	unsigned char		Msg[0];
+} VMBUS_MSGINFO;
+
+
+//
+// Externs
+//
+extern VMBUS_CONNECTION gVmbusConnection;
+
+//
+// General vmbus interface
+//
+INTERNAL DEVICE_OBJECT*
+VmbusChildDeviceCreate(
+	GUID deviceType,
+	GUID deviceInstance,
+	void *context);
+
+INTERNAL int
+VmbusChildDeviceAdd(
+	DEVICE_OBJECT* Device);
+
+INTERNAL void
+VmbusChildDeviceRemove(
+   DEVICE_OBJECT* Device);
+
+//INTERNAL void
+//VmbusChildDeviceDestroy(
+//	DEVICE_OBJECT*);
+
+INTERNAL VMBUS_CHANNEL*
+GetChannelFromRelId(
+	UINT32 relId
+	);
+
+//
+// Connection interface
+//
+INTERNAL int
+VmbusConnect(
+	VOID
+	);
+
+INTERNAL int
+VmbusDisconnect(
+	VOID
+	);
+
+INTERNAL int
+VmbusPostMessage(
+	PVOID			buffer,
+	SIZE_T			bufSize
+	);
+
+INTERNAL int
+VmbusSetEvent(
+	UINT32 childRelId
+	);
+
+INTERNAL VOID
+VmbusOnEvents(
+  VOID
+	);
+
+
+#endif // _VMBUS_PRIVATE_H_