drivers/staging/hv/vmbus_api.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_API_H_
  26 #define _VMBUS_API_H_
  27
  28 #define MAX_PAGE_BUFFER_COUNT                           16
  29 #define MAX_MULTIPAGE_BUFFER_COUNT                      32 /* 128K */
  30
  31 #pragma pack(push, 1)
  32
  33 /* Single-page buffer */
  34 struct hv_page_buffer {
  35         u32 Length;
  36         u32 Offset;
  37         u64 Pfn;
  38 };
  39
  40 /* Multiple-page buffer */
  41 struct hv_multipage_buffer {
  42         /* Length and Offset determines the # of pfns in the array */
  43         u32 Length;
  44         u32 Offset;
  45         u64 PfnArray[MAX_MULTIPAGE_BUFFER_COUNT];
  46 };
  47
  48 /* 0x18 includes the proprietary packet header */
  49 #define MAX_PAGE_BUFFER_PACKET          (0x18 +                 \
  50                                         (sizeof(struct hv_page_buffer) * \
  51                                          MAX_PAGE_BUFFER_COUNT))
  52 #define MAX_MULTIPAGE_BUFFER_PACKET     (0x18 +                 \
  53                                          sizeof(struct hv_multipage_buffer))
  54
  55
  56 #pragma pack(pop)
  57
  58 struct hv_driver;
  59 struct hv_device;
  60
  61 struct hv_dev_port_info {
  62         u32 InterruptMask;
  63         u32 ReadIndex;
  64         u32 WriteIndex;
  65         u32 BytesAvailToRead;
  66         u32 BytesAvailToWrite;
  67 };
  68
  69 struct hv_device_info {
  70         u32 ChannelId;
  71         u32 ChannelState;
  72         struct hv_guid ChannelType;
  73         struct hv_guid ChannelInstance;
  74
  75         u32 MonitorId;
  76         u32 ServerMonitorPending;
  77         u32 ServerMonitorLatency;
  78         u32 ServerMonitorConnectionId;
  79         u32 ClientMonitorPending;
  80         u32 ClientMonitorLatency;
  81         u32 ClientMonitorConnectionId;
  82
  83         struct hv_dev_port_info Inbound;
  84         struct hv_dev_port_info Outbound;
  85 };
  86
  87 /**
  88  * struct vmbus_channel_interface - Contains member functions for vmbus channel
  89  * @Open:      Open the channel
  90  * @Close:     Close the channel
  91  * @SendPacket:        Send a packet over the channel
  92  * @SendPacketPageBuffer:      Send a single page buffer over the channel
  93  *
  94  * This structure contains function pointer to control vmbus channel
  95  * behavior. None of these functions is externally callable, but they
  96  * are used for normal vmbus channel internal behavior.
  97  * Only used by Hyper-V drivers.
  98  */
  99 struct vmbus_channel_interface {
 100         int (*Open)(struct hv_device *Device, u32 SendBufferSize,
 101                     u32 RecvRingBufferSize, void *UserData, u32 UserDataLen,
 102                     void (*ChannelCallback)(void *context),
 103                     void *Context);
 104         void (*Close)(struct hv_device *device);
 105         int (*SendPacket)(struct hv_device *Device, const void *Buffer,
 106                           u32 BufferLen, u64 RequestId, u32 Type, u32 Flags);
 107         int (*SendPacketPageBuffer)(struct hv_device *dev,
 108                                     struct hv_page_buffer PageBuffers[],
 109                                     u32 PageCount, void *Buffer, u32 BufferLen,
 110                                     u64 RequestId);
 111 };
 112
 113 extern const struct vmbus_channel_interface vmbus_ops;
 114
 115
 116 /* Base driver object */
 117 struct hv_driver {
 118         const char *name;
 119
 120         /* the device type supported by this driver */
 121         struct hv_guid deviceType;
 122
 123         int (*OnDeviceAdd)(struct hv_device *device, void *data);
 124         int (*OnDeviceRemove)(struct hv_device *device);
 125         void (*OnCleanup)(struct hv_driver *driver);
 126
 127         struct vmbus_channel_interface VmbusChannelInterface;
 128 };
 129
 130 /* Base device object */
 131 struct hv_device {
 132         /* the driver for this device */
 133         struct hv_driver *Driver;
 134
 135         char name[64];
 136
 137         /* the device type id of this device */
 138         struct hv_guid deviceType;
 139
 140         /* the device instance id of this device */
 141         struct hv_guid deviceInstance;
 142
 143         struct vmbus_channel *channel;
 144
 145         /* Device extension; */
 146         void *Extension;
 147 };
 148
 149 /* Vmbus driver object */
 150 struct vmbus_driver {
 151         /* !! Must be the 1st field !! */
 152         /* FIXME if ^, then someone is doing somthing stupid */
 153         struct hv_driver Base;
 154
 155         /* Set by the caller */
 156         struct hv_device * (*OnChildDeviceCreate)(struct hv_guid *DeviceType,
 157                                                 struct hv_guid *DeviceInstance,
 158                                                 struct vmbus_channel *channel);
 159         void (*OnChildDeviceDestroy)(struct hv_device *device);
 160         int (*OnChildDeviceAdd)(struct hv_device *RootDevice,
 161                                 struct hv_device *ChildDevice);
 162         void (*OnChildDeviceRemove)(struct hv_device *device);
 163
 164         /* Set by the callee */
 165         int (*OnIsr)(struct hv_driver *driver);
 166         void (*OnMsgDpc)(struct hv_driver *driver);
 167         void (*OnEventDpc)(struct hv_driver *driver);
 168         void (*GetChannelOffers)(void);
 169 };
 170
 171 int VmbusInitialize(struct hv_driver *drv);
 172
 173 #endif /* _VMBUS_API_H_ */