drivers/staging/hv/channel.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 _CHANNEL_H_
  26 #define _CHANNEL_H_
  27
  28 #include "channel_mgmt.h"
  29
  30 /* The format must be the same as struct vmdata_gpa_direct */
  31 struct vmbus_channel_packet_page_buffer {
  32         u16 type;
  33         u16 dataoffset8;
  34         u16 length8;
  35         u16 flags;
  36         u64 transactionid;
  37         u32 reserved;
  38         u32 rangecount;
  39         struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
  40 } __attribute__((packed));
  41
  42 /* The format must be the same as struct vmdata_gpa_direct */
  43 struct vmbus_channel_packet_multipage_buffer {
  44         u16 type;
  45         u16 dataoffset8;
  46         u16 length8;
  47         u16 flags;
  48         u64 transactionid;
  49         u32 reserved;
  50         u32 rangecount;         /* Always 1 in this case */
  51         struct hv_multipage_buffer range;
  52 } __attribute__((packed));
  53
  54
  55 extern int vmbus_open(struct vmbus_channel *channel,
  56                             u32 send_ringbuffersize,
  57                             u32 recv_ringbuffersize,
  58                             void *userdata,
  59                             u32 userdatalen,
  60                             void(*onchannel_callback)(void *context),
  61                             void *context);
  62
  63 extern void vmbus_close(struct vmbus_channel *channel);
  64
  65 extern int vmbus_sendpacket(struct vmbus_channel *channel,
  66                                   const void *buffer,
  67                                   u32 bufferLen,
  68                                   u64 requestid,
  69                                   enum vmbus_packet_type type,
  70                                   u32 flags);
  71
  72 extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
  73                                             struct hv_page_buffer pagebuffers[],
  74                                             u32 pagecount,
  75                                             void *buffer,
  76                                             u32 bufferlen,
  77                                             u64 requestid);
  78
  79 extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
  80                                         struct hv_multipage_buffer *mpb,
  81                                         void *buffer,
  82                                         u32 bufferlen,
  83                                         u64 requestid);
  84
  85 extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
  86                                       void *kbuffer,
  87                                       u32 size,
  88                                       u32 *gpadl_handle);
  89
  90 extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
  91                                      u32 gpadl_handle);
  92
  93 extern int vmbus_recvpacket(struct vmbus_channel *channel,
  94                                   void *buffer,
  95                                   u32 bufferlen,
  96                                   u32 *buffer_actual_len,
  97                                   u64 *requestid);
  98
  99 extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
 100                                      void *buffer,
 101                                      u32 bufferlen,
 102                                      u32 *buffer_actual_len,
 103                                      u64 *requestid);
 104
 105 extern void vmbus_onchannel_event(struct vmbus_channel *channel);
 106
 107 extern void vmbus_get_debug_info(struct vmbus_channel *channel,
 108                                      struct vmbus_channel_debug_info *debug);
 109
 110 extern void vmbus_ontimer(unsigned long data);
 111
 112 #endif /* _CHANNEL_H_ */