/*
 *
 * 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 _STORVSC_API_H_
#define _STORVSC_API_H_

#include "VmbusApi.h"

//
// Defines
//

#define STORVSC_RING_BUFFER_SIZE			10*PAGE_SIZE
#define BLKVSC_RING_BUFFER_SIZE				20*PAGE_SIZE

#define STORVSC_MAX_IO_REQUESTS				64

// In Hyper-V, each port/path/target maps to 1 scsi host adapter.
// In reality, the path/target is not used (ie always set to 0) so
// our scsi host adapter essentially has 1 bus with 1 target that contains
// up to 256 luns.

#define STORVSC_MAX_LUNS_PER_TARGET			64
#define STORVSC_MAX_TARGETS					1
#define STORVSC_MAX_CHANNELS				1


// Fwd decl
//
//struct VMBUS_CHANNEL;
typedef struct _STORVSC_REQUEST* PSTORVSC_REQUEST;

//
// Data types
//
typedef int (*PFN_ON_IO_REQUEST)(PDEVICE_OBJECT Device, PSTORVSC_REQUEST Request);
typedef void (*PFN_ON_IO_REQUEST_COMPLTN)(PSTORVSC_REQUEST Request);

typedef int (*PFN_ON_HOST_RESET)(PDEVICE_OBJECT Device);
typedef void (*PFN_ON_HOST_RESCAN)(PDEVICE_OBJECT Device);


// Matches Windows-end
typedef enum _STORVSC_REQUEST_TYPE{
	WRITE_TYPE,
	READ_TYPE,
	UNKNOWN_TYPE,
} STORVSC_REQUEST_TYPE;


typedef struct _STORVSC_REQUEST {
	STORVSC_REQUEST_TYPE		Type;
	UINT32					Host;
	UINT32					Bus;
	UINT32					TargetId;
	UINT32					LunId;
	UINT8*					Cdb;
	UINT32					CdbLen;
	UINT32					Status;
	UINT32					BytesXfer;

	UCHAR*					SenseBuffer;
	UINT32					SenseBufferSize;

	PVOID					Context;

	PFN_ON_IO_REQUEST_COMPLTN	OnIOCompletion;

	// This points to the memory after DataBuffer
	PVOID					Extension;

	MULTIPAGE_BUFFER		DataBuffer;
} STORVSC_REQUEST;


// Represents the block vsc driver
typedef struct _STORVSC_DRIVER_OBJECT {
	DRIVER_OBJECT			Base; // Must be the first field

	// Set by caller (in bytes)
	UINT32					RingBufferSize;

	// Allocate this much private extension for each I/O request
	UINT32					RequestExtSize;

	// Maximum # of requests in flight per channel/device
	UINT32					MaxOutstandingRequestsPerChannel;

	// Set by the caller to allow us to re-enumerate the bus on the host
	PFN_ON_HOST_RESCAN		OnHostRescan;

	// Specific to this driver
	PFN_ON_IO_REQUEST		OnIORequest;
	PFN_ON_HOST_RESET		OnHostReset;

} STORVSC_DRIVER_OBJECT;

typedef struct _STORVSC_DEVICE_INFO {
	ULONG	PortNumber;
    UCHAR	PathId;
    UCHAR	TargetId;
} STORVSC_DEVICE_INFO;

//
// Interface
//
int
StorVscInitialize(
	DRIVER_OBJECT	*Driver
	);

int
BlkVscInitialize(
	DRIVER_OBJECT	*Driver
	);
#endif // _STORVSC_API_H_