drivers/staging/hv/StorVscApi.h

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24
  25 #ifndef _STORVSC_API_H_
  26 #define _STORVSC_API_H_
  27
  28 #include "VmbusApi.h"
  29
  30 /* Defines */
  31 #define STORVSC_RING_BUFFER_SIZE                        (20*PAGE_SIZE)
  32 #define BLKVSC_RING_BUFFER_SIZE                         (20*PAGE_SIZE)
  33
  34 #define STORVSC_MAX_IO_REQUESTS                         128
  35
  36 /*
  37  * In Hyper-V, each port/path/target maps to 1 scsi host adapter.  In
  38  * reality, the path/target is not used (ie always set to 0) so our
  39  * scsi host adapter essentially has 1 bus with 1 target that contains
  40  * up to 256 luns.
  41  */
  42 #define STORVSC_MAX_LUNS_PER_TARGET                     64
  43 #define STORVSC_MAX_TARGETS                             1
  44 #define STORVSC_MAX_CHANNELS                            1
  45
  46 struct hv_storvsc_request;
  47
  48 /* Matches Windows-end */
  49 enum storvsc_request_type{
  50         WRITE_TYPE,
  51         READ_TYPE,
  52         UNKNOWN_TYPE,
  53 };
  54
  55 struct hv_storvsc_request {
  56         enum storvsc_request_type Type;
  57         u32 Host;
  58         u32 Bus;
  59         u32 TargetId;
  60         u32 LunId;
  61         u8 *Cdb;
  62         u32 CdbLen;
  63         u32 Status;
  64         u32 BytesXfer;
  65
  66         unsigned char *SenseBuffer;
  67         u32 SenseBufferSize;
  68
  69         void *Context;
  70
  71         void (*OnIOCompletion)(struct hv_storvsc_request *Request);
  72
  73         /* This points to the memory after DataBuffer */
  74         void *Extension;
  75
  76         struct hv_multipage_buffer DataBuffer;
  77 };
  78
  79 /* Represents the block vsc driver */
  80 struct storvsc_driver_object {
  81         /* Must be the first field */
  82         /* Which is a bug FIXME! */
  83         struct hv_driver Base;
  84
  85         /* Set by caller (in bytes) */
  86         u32 RingBufferSize;
  87
  88         /* Allocate this much private extension for each I/O request */
  89         u32 RequestExtSize;
  90
  91         /* Maximum # of requests in flight per channel/device */
  92         u32 MaxOutstandingRequestsPerChannel;
  93
  94         /* Set by the caller to allow us to re-enumerate the bus on the host */
  95         void (*OnHostRescan)(struct hv_device *Device);
  96
  97         /* Specific to this driver */
  98         int (*OnIORequest)(struct hv_device *Device,
  99                            struct hv_storvsc_request *Request);
 100         int (*OnHostReset)(struct hv_device *Device);
 101 };
 102
 103 struct storvsc_device_info {
 104         unsigned int PortNumber;
 105         unsigned char PathId;
 106         unsigned char TargetId;
 107 };
 108
 109 /* Interface */
 110 int StorVscInitialize(struct hv_driver *driver);
 111 int BlkVscInitialize(struct hv_driver *driver);
 112
 113 #endif /* _STORVSC_API_H_ */