drivers/staging/hv/VmbusPrivate.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 _VMBUS_PRIVATE_H_
  26 #define _VMBUS_PRIVATE_H_
  27
  28 #include "Hv.h"
  29 #include "include/VmbusApi.h"
  30 #include "Channel.h"
  31 #include "ChannelMgmt.h"
  32 #include "ChannelInterface.h"
  33 /* #include "ChannelMessages.h" */
  34 #include "RingBuffer.h"
  35 /* #include "Packet.h" */
  36 #include "include/List.h"
  37
  38
  39 /* Defines */
  40
  41
  42 /*
  43  * Maximum channels is determined by the size of the interrupt page
  44  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
  45  * and the other is receive endpoint interrupt
  46  */
  47 #define MAX_NUM_CHANNELS                                (PAGE_SIZE >> 1) << 3  /* 16348 channels */
  48
  49 /* The value here must be in multiple of 32 */
  50 /* TODO: Need to make this configurable */
  51 #define MAX_NUM_CHANNELS_SUPPORTED              256
  52
  53
  54 /* Data types */
  55
  56
  57 enum VMBUS_CONNECT_STATE {
  58         Disconnected,
  59         Connecting,
  60         Connected,
  61         Disconnecting
  62 };
  63
  64 #define MAX_SIZE_CHANNEL_MESSAGE                        HV_MESSAGE_PAYLOAD_BYTE_COUNT
  65
  66 struct VMBUS_CONNECTION {
  67
  68         enum VMBUS_CONNECT_STATE                                        ConnectState;
  69
  70         u32                                                             NextGpadlHandle;
  71
  72         /*
  73          * Represents channel interrupts. Each bit position represents
  74          * a channel.  When a channel sends an interrupt via VMBUS, it
  75          * finds its bit in the sendInterruptPage, set it and calls Hv
  76          * to generate a port event. The other end receives the port
  77          * event and parse the recvInterruptPage to see which bit is
  78          * set
  79          */
  80         void *                                                          InterruptPage;
  81         void *                                                          SendInterruptPage;
  82         void *                                                          RecvInterruptPage;
  83
  84         /*
  85          * 2 pages - 1st page for parent->child notification and 2nd
  86          * is child->parent notification
  87          */
  88         void *                                                          MonitorPages;
  89         LIST_ENTRY                                                      ChannelMsgList;
  90         spinlock_t channelmsg_lock;
  91
  92         /* List of channels */
  93         LIST_ENTRY                                                      ChannelList;
  94         spinlock_t channel_lock;
  95
  96         struct workqueue_struct *WorkQueue;
  97 };
  98
  99
 100 struct VMBUS_MSGINFO {
 101         /* Bookkeeping stuff */
 102         LIST_ENTRY                      MsgListEntry;
 103
 104         /* Synchronize the request/response if needed */
 105         HANDLE                          WaitEvent;
 106
 107         /* The message itself */
 108         unsigned char           Msg[0];
 109 };
 110
 111
 112
 113 /* Externs */
 114
 115 extern struct VMBUS_CONNECTION gVmbusConnection;
 116
 117
 118 /* General vmbus interface */
 119
 120 static struct hv_device*
 121 VmbusChildDeviceCreate(
 122         GUID deviceType,
 123         GUID deviceInstance,
 124         void *context);
 125
 126 static int
 127 VmbusChildDeviceAdd(
 128         struct hv_device *Device);
 129
 130 static void
 131 VmbusChildDeviceRemove(
 132    struct hv_device *Device);
 133
 134 /* static void */
 135 /* VmbusChildDeviceDestroy( */
 136 /* struct hv_device *); */
 137
 138 static VMBUS_CHANNEL*
 139 GetChannelFromRelId(
 140         u32 relId
 141         );
 142
 143
 144 /* Connection interface */
 145
 146 static int
 147 VmbusConnect(
 148         void
 149         );
 150
 151 static int
 152 VmbusDisconnect(
 153         void
 154         );
 155
 156 static int
 157 VmbusPostMessage(
 158         void *                  buffer,
 159         size_t                  bufSize
 160         );
 161
 162 static int
 163 VmbusSetEvent(
 164         u32 childRelId
 165         );
 166
 167 static void
 168 VmbusOnEvents(
 169   void
 170         );
 171
 172
 173 #endif /* _VMBUS_PRIVATE_H_ */