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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>
*
*/
#ifndef _STORVSC_API_H_
#define _STORVSC_API_H_
#include "vmbus_api.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
struct hv_storvsc_request;
/* Matches Windows-end */
enum storvsc_request_type{
WRITE_TYPE,
READ_TYPE,
UNKNOWN_TYPE,
};
struct hv_storvsc_request {
enum storvsc_request_type Type;
u32 Host;
u32 Bus;
u32 TargetId;
u32 LunId;
u8 *Cdb;
u32 CdbLen;
u32 Status;
u32 BytesXfer;
unsigned char *SenseBuffer;
u32 SenseBufferSize;
void *Context;
void (*OnIOCompletion)(struct hv_storvsc_request *Request);
/* This points to the memory after DataBuffer */
void *Extension;
struct hv_multipage_buffer DataBuffer;
};
/* Represents the block vsc driver */
struct storvsc_driver_object {
/* Must be the first field */
/* Which is a bug FIXME! */
struct hv_driver Base;
/* Set by caller (in bytes) */
u32 RingBufferSize;
/* Allocate this much private extension for each I/O request */
u32 RequestExtSize;
/* Maximum # of requests in flight per channel/device */
u32 MaxOutstandingRequestsPerChannel;
/* Specific to this driver */
int (*OnIORequest)(struct hv_device *Device,
struct hv_storvsc_request *Request);
};
struct storvsc_device_info {
unsigned int PortNumber;
unsigned char PathId;
unsigned char TargetId;
};
/* Interface */
int StorVscInitialize(struct hv_driver *driver);
int StorVscOnHostReset(struct hv_device *Device);
int BlkVscInitialize(struct hv_driver *driver);
#endif /* _STORVSC_API_H_ */
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