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