include/linux/hyperv.h

   1 /*
   2  *
   3  * Copyright (c) 2011, 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  *   K. Y. Srinivasan <kys@microsoft.com>
  22  *
  23  */
  24
  25 #ifndef _HYPERV_H
  26 #define _HYPERV_H
  27
  28 #include <linux/scatterlist.h>
  29 #include <linux/list.h>
  30 #include <linux/uuid.h>
  31 #include <linux/timer.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/completion.h>
  34 #include <linux/device.h>
  35 #include <linux/mod_devicetable.h>
  36
  37
  38 #define MAX_PAGE_BUFFER_COUNT                           19
  39 #define MAX_MULTIPAGE_BUFFER_COUNT                      32 /* 128K */
  40
  41 #pragma pack(push, 1)
  42
  43 /* Single-page buffer */
  44 struct hv_page_buffer {
  45         u32 len;
  46         u32 offset;
  47         u64 pfn;
  48 };
  49
  50 /* Multiple-page buffer */
  51 struct hv_multipage_buffer {
  52         /* Length and Offset determines the # of pfns in the array */
  53         u32 len;
  54         u32 offset;
  55         u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
  56 };
  57
  58 /* 0x18 includes the proprietary packet header */
  59 #define MAX_PAGE_BUFFER_PACKET          (0x18 +                 \
  60                                         (sizeof(struct hv_page_buffer) * \
  61                                          MAX_PAGE_BUFFER_COUNT))
  62 #define MAX_MULTIPAGE_BUFFER_PACKET     (0x18 +                 \
  63                                          sizeof(struct hv_multipage_buffer))
  64
  65
  66 #pragma pack(pop)
  67
  68 struct hv_ring_buffer {
  69         /* Offset in bytes from the start of ring data below */
  70         u32 write_index;
  71
  72         /* Offset in bytes from the start of ring data below */
  73         u32 read_index;
  74
  75         u32 interrupt_mask;
  76
  77         /* Pad it to PAGE_SIZE so that data starts on page boundary */
  78         u8      reserved[4084];
  79
  80         /* NOTE:
  81          * The interrupt_mask field is used only for channels but since our
  82          * vmbus connection also uses this data structure and its data starts
  83          * here, we commented out this field.
  84          */
  85
  86         /*
  87          * Ring data starts here + RingDataStartOffset
  88          * !!! DO NOT place any fields below this !!!
  89          */
  90         u8 buffer[0];
  91 } __packed;
  92
  93 struct hv_ring_buffer_info {
  94         struct hv_ring_buffer *ring_buffer;
  95         u32 ring_size;                  /* Include the shared header */
  96         spinlock_t ring_lock;
  97
  98         u32 ring_datasize;              /* < ring_size */
  99         u32 ring_data_startoffset;
 100 };
 101
 102 struct hv_ring_buffer_debug_info {
 103         u32 current_interrupt_mask;
 104         u32 current_read_index;
 105         u32 current_write_index;
 106         u32 bytes_avail_toread;
 107         u32 bytes_avail_towrite;
 108 };
 109
 110 /*
 111  * We use the same version numbering for all Hyper-V modules.
 112  *
 113  * Definition of versioning is as follows;
 114  *
 115  *      Major Number    Changes for these scenarios;
 116  *                      1.      When a new version of Windows Hyper-V
 117  *                              is released.
 118  *                      2.      A Major change has occurred in the
 119  *                              Linux IC's.
 120  *                      (For example the merge for the first time
 121  *                      into the kernel) Every time the Major Number
 122  *                      changes, the Revision number is reset to 0.
 123  *      Minor Number    Changes when new functionality is added
 124  *                      to the Linux IC's that is not a bug fix.
 125  *
 126  * 3.1 - Added completed hv_utils driver. Shutdown/Heartbeat/Timesync
 127  */
 128 #define HV_DRV_VERSION           "3.1"
 129
 130
 131 /*
 132  * A revision number of vmbus that is used for ensuring both ends on a
 133  * partition are using compatible versions.
 134  */
 135 #define VMBUS_REVISION_NUMBER           13
 136
 137 /* Make maximum size of pipe payload of 16K */
 138 #define MAX_PIPE_DATA_PAYLOAD           (sizeof(u8) * 16384)
 139
 140 /* Define PipeMode values. */
 141 #define VMBUS_PIPE_TYPE_BYTE            0x00000000
 142 #define VMBUS_PIPE_TYPE_MESSAGE         0x00000004
 143
 144 /* The size of the user defined data buffer for non-pipe offers. */
 145 #define MAX_USER_DEFINED_BYTES          120
 146
 147 /* The size of the user defined data buffer for pipe offers. */
 148 #define MAX_PIPE_USER_DEFINED_BYTES     116
 149
 150 /*
 151  * At the center of the Channel Management library is the Channel Offer. This
 152  * struct contains the fundamental information about an offer.
 153  */
 154 struct vmbus_channel_offer {
 155         uuid_le if_type;
 156         uuid_le if_instance;
 157         u64 int_latency; /* in 100ns units */
 158         u32 if_revision;
 159         u32 server_ctx_size;    /* in bytes */
 160         u16 chn_flags;
 161         u16 mmio_megabytes;             /* in bytes * 1024 * 1024 */
 162
 163         union {
 164                 /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
 165                 struct {
 166                         unsigned char user_def[MAX_USER_DEFINED_BYTES];
 167                 } std;
 168
 169                 /*
 170                  * Pipes:
 171                  * The following sructure is an integrated pipe protocol, which
 172                  * is implemented on top of standard user-defined data. Pipe
 173                  * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
 174                  * use.
 175                  */
 176                 struct {
 177                         u32  pipe_mode;
 178                         unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
 179                 } pipe;
 180         } u;
 181         u32 padding;
 182 } __packed;
 183
 184 /* Server Flags */
 185 #define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE        1
 186 #define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES    2
 187 #define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS            4
 188 #define VMBUS_CHANNEL_NAMED_PIPE_MODE                   0x10
 189 #define VMBUS_CHANNEL_LOOPBACK_OFFER                    0x100
 190 #define VMBUS_CHANNEL_PARENT_OFFER                      0x200
 191 #define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION    0x400
 192
 193 struct vmpacket_descriptor {
 194         u16 type;
 195         u16 offset8;
 196         u16 len8;
 197         u16 flags;
 198         u64 trans_id;
 199 } __packed;
 200
 201 struct vmpacket_header {
 202         u32 prev_pkt_start_offset;
 203         struct vmpacket_descriptor descriptor;
 204 } __packed;
 205
 206 struct vmtransfer_page_range {
 207         u32 byte_count;
 208         u32 byte_offset;
 209 } __packed;
 210
 211 struct vmtransfer_page_packet_header {
 212         struct vmpacket_descriptor d;
 213         u16 xfer_pageset_id;
 214         bool sender_owns_set;
 215         u8 reserved;
 216         u32 range_cnt;
 217         struct vmtransfer_page_range ranges[1];
 218 } __packed;
 219
 220 struct vmgpadl_packet_header {
 221         struct vmpacket_descriptor d;
 222         u32 gpadl;
 223         u32 reserved;
 224 } __packed;
 225
 226 struct vmadd_remove_transfer_page_set {
 227         struct vmpacket_descriptor d;
 228         u32 gpadl;
 229         u16 xfer_pageset_id;
 230         u16 reserved;
 231 } __packed;
 232
 233 /*
 234  * This structure defines a range in guest physical space that can be made to
 235  * look virtually contiguous.
 236  */
 237 struct gpa_range {
 238         u32 byte_count;
 239         u32 byte_offset;
 240         u64 pfn_array[0];
 241 };
 242
 243 /*
 244  * This is the format for an Establish Gpadl packet, which contains a handle by
 245  * which this GPADL will be known and a set of GPA ranges associated with it.
 246  * This can be converted to a MDL by the guest OS.  If there are multiple GPA
 247  * ranges, then the resulting MDL will be "chained," representing multiple VA
 248  * ranges.
 249  */
 250 struct vmestablish_gpadl {
 251         struct vmpacket_descriptor d;
 252         u32 gpadl;
 253         u32 range_cnt;
 254         struct gpa_range range[1];
 255 } __packed;
 256
 257 /*
 258  * This is the format for a Teardown Gpadl packet, which indicates that the
 259  * GPADL handle in the Establish Gpadl packet will never be referenced again.
 260  */
 261 struct vmteardown_gpadl {
 262         struct vmpacket_descriptor d;
 263         u32 gpadl;
 264         u32 reserved;   /* for alignment to a 8-byte boundary */
 265 } __packed;
 266
 267 /*
 268  * This is the format for a GPA-Direct packet, which contains a set of GPA
 269  * ranges, in addition to commands and/or data.
 270  */
 271 struct vmdata_gpa_direct {
 272         struct vmpacket_descriptor d;
 273         u32 reserved;
 274         u32 range_cnt;
 275         struct gpa_range range[1];
 276 } __packed;
 277
 278 /* This is the format for a Additional Data Packet. */
 279 struct vmadditional_data {
 280         struct vmpacket_descriptor d;
 281         u64 total_bytes;
 282         u32 offset;
 283         u32 byte_cnt;
 284         unsigned char data[1];
 285 } __packed;
 286
 287 union vmpacket_largest_possible_header {
 288         struct vmpacket_descriptor simple_hdr;
 289         struct vmtransfer_page_packet_header xfer_page_hdr;
 290         struct vmgpadl_packet_header gpadl_hdr;
 291         struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
 292         struct vmestablish_gpadl establish_gpadl_hdr;
 293         struct vmteardown_gpadl teardown_gpadl_hdr;
 294         struct vmdata_gpa_direct data_gpa_direct_hdr;
 295 };
 296
 297 #define VMPACKET_DATA_START_ADDRESS(__packet)   \
 298         (void *)(((unsigned char *)__packet) +  \
 299          ((struct vmpacket_descriptor)__packet)->offset8 * 8)
 300
 301 #define VMPACKET_DATA_LENGTH(__packet)          \
 302         ((((struct vmpacket_descriptor)__packet)->len8 -        \
 303           ((struct vmpacket_descriptor)__packet)->offset8) * 8)
 304
 305 #define VMPACKET_TRANSFER_MODE(__packet)        \
 306         (((struct IMPACT)__packet)->type)
 307
 308 enum vmbus_packet_type {
 309         VM_PKT_INVALID                          = 0x0,
 310         VM_PKT_SYNCH                            = 0x1,
 311         VM_PKT_ADD_XFER_PAGESET                 = 0x2,
 312         VM_PKT_RM_XFER_PAGESET                  = 0x3,
 313         VM_PKT_ESTABLISH_GPADL                  = 0x4,
 314         VM_PKT_TEARDOWN_GPADL                   = 0x5,
 315         VM_PKT_DATA_INBAND                      = 0x6,
 316         VM_PKT_DATA_USING_XFER_PAGES            = 0x7,
 317         VM_PKT_DATA_USING_GPADL                 = 0x8,
 318         VM_PKT_DATA_USING_GPA_DIRECT            = 0x9,
 319         VM_PKT_CANCEL_REQUEST                   = 0xa,
 320         VM_PKT_COMP                             = 0xb,
 321         VM_PKT_DATA_USING_ADDITIONAL_PKT        = 0xc,
 322         VM_PKT_ADDITIONAL_DATA                  = 0xd
 323 };
 324
 325 #define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED     1
 326
 327
 328 /* Version 1 messages */
 329 enum vmbus_channel_message_type {
 330         CHANNELMSG_INVALID                      =  0,
 331         CHANNELMSG_OFFERCHANNEL         =  1,
 332         CHANNELMSG_RESCIND_CHANNELOFFER =  2,
 333         CHANNELMSG_REQUESTOFFERS                =  3,
 334         CHANNELMSG_ALLOFFERS_DELIVERED  =  4,
 335         CHANNELMSG_OPENCHANNEL          =  5,
 336         CHANNELMSG_OPENCHANNEL_RESULT           =  6,
 337         CHANNELMSG_CLOSECHANNEL         =  7,
 338         CHANNELMSG_GPADL_HEADER         =  8,
 339         CHANNELMSG_GPADL_BODY                   =  9,
 340         CHANNELMSG_GPADL_CREATED                = 10,
 341         CHANNELMSG_GPADL_TEARDOWN               = 11,
 342         CHANNELMSG_GPADL_TORNDOWN               = 12,
 343         CHANNELMSG_RELID_RELEASED               = 13,
 344         CHANNELMSG_INITIATE_CONTACT             = 14,
 345         CHANNELMSG_VERSION_RESPONSE             = 15,
 346         CHANNELMSG_UNLOAD                       = 16,
 347 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
 348         CHANNELMSG_VIEWRANGE_ADD                = 17,
 349         CHANNELMSG_VIEWRANGE_REMOVE             = 18,
 350 #endif
 351         CHANNELMSG_COUNT
 352 };
 353
 354 struct vmbus_channel_message_header {
 355         enum vmbus_channel_message_type msgtype;
 356         u32 padding;
 357 } __packed;
 358
 359 /* Query VMBus Version parameters */
 360 struct vmbus_channel_query_vmbus_version {
 361         struct vmbus_channel_message_header header;
 362         u32 version;
 363 } __packed;
 364
 365 /* VMBus Version Supported parameters */
 366 struct vmbus_channel_version_supported {
 367         struct vmbus_channel_message_header header;
 368         bool version_supported;
 369 } __packed;
 370
 371 /* Offer Channel parameters */
 372 struct vmbus_channel_offer_channel {
 373         struct vmbus_channel_message_header header;
 374         struct vmbus_channel_offer offer;
 375         u32 child_relid;
 376         u8 monitorid;
 377         bool monitor_allocated;
 378 } __packed;
 379
 380 /* Rescind Offer parameters */
 381 struct vmbus_channel_rescind_offer {
 382         struct vmbus_channel_message_header header;
 383         u32 child_relid;
 384 } __packed;
 385
 386 /*
 387  * Request Offer -- no parameters, SynIC message contains the partition ID
 388  * Set Snoop -- no parameters, SynIC message contains the partition ID
 389  * Clear Snoop -- no parameters, SynIC message contains the partition ID
 390  * All Offers Delivered -- no parameters, SynIC message contains the partition
 391  *                         ID
 392  * Flush Client -- no parameters, SynIC message contains the partition ID
 393  */
 394
 395 /* Open Channel parameters */
 396 struct vmbus_channel_open_channel {
 397         struct vmbus_channel_message_header header;
 398
 399         /* Identifies the specific VMBus channel that is being opened. */
 400         u32 child_relid;
 401
 402         /* ID making a particular open request at a channel offer unique. */
 403         u32 openid;
 404
 405         /* GPADL for the channel's ring buffer. */
 406         u32 ringbuffer_gpadlhandle;
 407
 408         /* GPADL for the channel's server context save area. */
 409         u32 server_contextarea_gpadlhandle;
 410
 411         /*
 412         * The upstream ring buffer begins at offset zero in the memory
 413         * described by RingBufferGpadlHandle. The downstream ring buffer
 414         * follows it at this offset (in pages).
 415         */
 416         u32 downstream_ringbuffer_pageoffset;
 417
 418         /* User-specific data to be passed along to the server endpoint. */
 419         unsigned char userdata[MAX_USER_DEFINED_BYTES];
 420 } __packed;
 421
 422 /* Open Channel Result parameters */
 423 struct vmbus_channel_open_result {
 424         struct vmbus_channel_message_header header;
 425         u32 child_relid;
 426         u32 openid;
 427         u32 status;
 428 } __packed;
 429
 430 /* Close channel parameters; */
 431 struct vmbus_channel_close_channel {
 432         struct vmbus_channel_message_header header;
 433         u32 child_relid;
 434 } __packed;
 435
 436 /* Channel Message GPADL */
 437 #define GPADL_TYPE_RING_BUFFER          1
 438 #define GPADL_TYPE_SERVER_SAVE_AREA     2
 439 #define GPADL_TYPE_TRANSACTION          8
 440
 441 /*
 442  * The number of PFNs in a GPADL message is defined by the number of
 443  * pages that would be spanned by ByteCount and ByteOffset.  If the
 444  * implied number of PFNs won't fit in this packet, there will be a
 445  * follow-up packet that contains more.
 446  */
 447 struct vmbus_channel_gpadl_header {
 448         struct vmbus_channel_message_header header;
 449         u32 child_relid;
 450         u32 gpadl;
 451         u16 range_buflen;
 452         u16 rangecount;
 453         struct gpa_range range[0];
 454 } __packed;
 455
 456 /* This is the followup packet that contains more PFNs. */
 457 struct vmbus_channel_gpadl_body {
 458         struct vmbus_channel_message_header header;
 459         u32 msgnumber;
 460         u32 gpadl;
 461         u64 pfn[0];
 462 } __packed;
 463
 464 struct vmbus_channel_gpadl_created {
 465         struct vmbus_channel_message_header header;
 466         u32 child_relid;
 467         u32 gpadl;
 468         u32 creation_status;
 469 } __packed;
 470
 471 struct vmbus_channel_gpadl_teardown {
 472         struct vmbus_channel_message_header header;
 473         u32 child_relid;
 474         u32 gpadl;
 475 } __packed;
 476
 477 struct vmbus_channel_gpadl_torndown {
 478         struct vmbus_channel_message_header header;
 479         u32 gpadl;
 480 } __packed;
 481
 482 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
 483 struct vmbus_channel_view_range_add {
 484         struct vmbus_channel_message_header header;
 485         PHYSICAL_ADDRESS viewrange_base;
 486         u64 viewrange_length;
 487         u32 child_relid;
 488 } __packed;
 489
 490 struct vmbus_channel_view_range_remove {
 491         struct vmbus_channel_message_header header;
 492         PHYSICAL_ADDRESS viewrange_base;
 493         u32 child_relid;
 494 } __packed;
 495 #endif
 496
 497 struct vmbus_channel_relid_released {
 498         struct vmbus_channel_message_header header;
 499         u32 child_relid;
 500 } __packed;
 501
 502 struct vmbus_channel_initiate_contact {
 503         struct vmbus_channel_message_header header;
 504         u32 vmbus_version_requested;
 505         u32 padding2;
 506         u64 interrupt_page;
 507         u64 monitor_page1;
 508         u64 monitor_page2;
 509 } __packed;
 510
 511 struct vmbus_channel_version_response {
 512         struct vmbus_channel_message_header header;
 513         bool version_supported;
 514 } __packed;
 515
 516 enum vmbus_channel_state {
 517         CHANNEL_OFFER_STATE,
 518         CHANNEL_OPENING_STATE,
 519         CHANNEL_OPEN_STATE,
 520 };
 521
 522 struct vmbus_channel_debug_info {
 523         u32 relid;
 524         enum vmbus_channel_state state;
 525         uuid_le interfacetype;
 526         uuid_le interface_instance;
 527         u32 monitorid;
 528         u32 servermonitor_pending;
 529         u32 servermonitor_latency;
 530         u32 servermonitor_connectionid;
 531         u32 clientmonitor_pending;
 532         u32 clientmonitor_latency;
 533         u32 clientmonitor_connectionid;
 534
 535         struct hv_ring_buffer_debug_info inbound;
 536         struct hv_ring_buffer_debug_info outbound;
 537 };
 538
 539 /*
 540  * Represents each channel msg on the vmbus connection This is a
 541  * variable-size data structure depending on the msg type itself
 542  */
 543 struct vmbus_channel_msginfo {
 544         /* Bookkeeping stuff */
 545         struct list_head msglistentry;
 546
 547         /* So far, this is only used to handle gpadl body message */
 548         struct list_head submsglist;
 549
 550         /* Synchronize the request/response if needed */
 551         struct completion  waitevent;
 552         union {
 553                 struct vmbus_channel_version_supported version_supported;
 554                 struct vmbus_channel_open_result open_result;
 555                 struct vmbus_channel_gpadl_torndown gpadl_torndown;
 556                 struct vmbus_channel_gpadl_created gpadl_created;
 557                 struct vmbus_channel_version_response version_response;
 558         } response;
 559
 560         u32 msgsize;
 561         /*
 562          * The channel message that goes out on the "wire".
 563          * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
 564          */
 565         unsigned char msg[0];
 566 };
 567
 568 struct vmbus_close_msg {
 569         struct vmbus_channel_msginfo info;
 570         struct vmbus_channel_close_channel msg;
 571 };
 572
 573 struct vmbus_channel {
 574         struct list_head listentry;
 575
 576         struct hv_device *device_obj;
 577
 578         struct work_struct work;
 579
 580         enum vmbus_channel_state state;
 581
 582         struct vmbus_channel_offer_channel offermsg;
 583         /*
 584          * These are based on the OfferMsg.MonitorId.
 585          * Save it here for easy access.
 586          */
 587         u8 monitor_grp;
 588         u8 monitor_bit;
 589
 590         u32 ringbuffer_gpadlhandle;
 591
 592         /* Allocated memory for ring buffer */
 593         void *ringbuffer_pages;
 594         u32 ringbuffer_pagecount;
 595         struct hv_ring_buffer_info outbound;    /* send to parent */
 596         struct hv_ring_buffer_info inbound;     /* receive from parent */
 597         spinlock_t inbound_lock;
 598         struct workqueue_struct *controlwq;
 599
 600         struct vmbus_close_msg close_msg;
 601
 602         /* Channel callback are invoked in this workqueue context */
 603         /* HANDLE dataWorkQueue; */
 604
 605         void (*onchannel_callback)(void *context);
 606         void *channel_callback_context;
 607 };
 608
 609 void vmbus_onmessage(void *context);
 610
 611 int vmbus_request_offers(void);
 612
 613 /* The format must be the same as struct vmdata_gpa_direct */
 614 struct vmbus_channel_packet_page_buffer {
 615         u16 type;
 616         u16 dataoffset8;
 617         u16 length8;
 618         u16 flags;
 619         u64 transactionid;
 620         u32 reserved;
 621         u32 rangecount;
 622         struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
 623 } __packed;
 624
 625 /* The format must be the same as struct vmdata_gpa_direct */
 626 struct vmbus_channel_packet_multipage_buffer {
 627         u16 type;
 628         u16 dataoffset8;
 629         u16 length8;
 630         u16 flags;
 631         u64 transactionid;
 632         u32 reserved;
 633         u32 rangecount;         /* Always 1 in this case */
 634         struct hv_multipage_buffer range;
 635 } __packed;
 636
 637
 638 extern int vmbus_open(struct vmbus_channel *channel,
 639                             u32 send_ringbuffersize,
 640                             u32 recv_ringbuffersize,
 641                             void *userdata,
 642                             u32 userdatalen,
 643                             void(*onchannel_callback)(void *context),
 644                             void *context);
 645
 646 extern void vmbus_close(struct vmbus_channel *channel);
 647
 648 extern int vmbus_sendpacket(struct vmbus_channel *channel,
 649                                   const void *buffer,
 650                                   u32 bufferLen,
 651                                   u64 requestid,
 652                                   enum vmbus_packet_type type,
 653                                   u32 flags);
 654
 655 extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
 656                                             struct hv_page_buffer pagebuffers[],
 657                                             u32 pagecount,
 658                                             void *buffer,
 659                                             u32 bufferlen,
 660                                             u64 requestid);
 661
 662 extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
 663                                         struct hv_multipage_buffer *mpb,
 664                                         void *buffer,
 665                                         u32 bufferlen,
 666                                         u64 requestid);
 667
 668 extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
 669                                       void *kbuffer,
 670                                       u32 size,
 671                                       u32 *gpadl_handle);
 672
 673 extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
 674                                      u32 gpadl_handle);
 675
 676 extern int vmbus_recvpacket(struct vmbus_channel *channel,
 677                                   void *buffer,
 678                                   u32 bufferlen,
 679                                   u32 *buffer_actual_len,
 680                                   u64 *requestid);
 681
 682 extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
 683                                      void *buffer,
 684                                      u32 bufferlen,
 685                                      u32 *buffer_actual_len,
 686                                      u64 *requestid);
 687
 688
 689 extern void vmbus_get_debug_info(struct vmbus_channel *channel,
 690                                      struct vmbus_channel_debug_info *debug);
 691
 692 extern void vmbus_ontimer(unsigned long data);
 693
 694 struct hv_dev_port_info {
 695         u32 int_mask;
 696         u32 read_idx;
 697         u32 write_idx;
 698         u32 bytes_avail_toread;
 699         u32 bytes_avail_towrite;
 700 };
 701
 702 /* Base driver object */
 703 struct hv_driver {
 704         const char *name;
 705
 706         /* the device type supported by this driver */
 707         uuid_le dev_type;
 708         const struct hv_vmbus_device_id *id_table;
 709
 710         struct device_driver driver;
 711
 712         int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
 713         int (*remove)(struct hv_device *);
 714         void (*shutdown)(struct hv_device *);
 715
 716 };
 717
 718 /* Base device object */
 719 struct hv_device {
 720         /* the device type id of this device */
 721         uuid_le dev_type;
 722
 723         /* the device instance id of this device */
 724         uuid_le dev_instance;
 725
 726         struct device device;
 727
 728         struct vmbus_channel *channel;
 729 };
 730
 731
 732 static inline struct hv_device *device_to_hv_device(struct device *d)
 733 {
 734         return container_of(d, struct hv_device, device);
 735 }
 736
 737 static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
 738 {
 739         return container_of(d, struct hv_driver, driver);
 740 }
 741
 742 static inline void hv_set_drvdata(struct hv_device *dev, void *data)
 743 {
 744         dev_set_drvdata(&dev->device, data);
 745 }
 746
 747 static inline void *hv_get_drvdata(struct hv_device *dev)
 748 {
 749         return dev_get_drvdata(&dev->device);
 750 }
 751
 752 /* Vmbus interface */
 753 #define vmbus_driver_register(driver)   \
 754         __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
 755 int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
 756                                          struct module *owner,
 757                                          const char *mod_name);
 758 void vmbus_driver_unregister(struct hv_driver *hv_driver);
 759
 760 /**
 761  * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
 762  *
 763  * This macro is used to create a struct hv_vmbus_device_id that matches a
 764  * specific device.
 765  */
 766 #define VMBUS_DEVICE(g0, g1, g2, g3, g4, g5, g6, g7,    \
 767                      g8, g9, ga, gb, gc, gd, ge, gf)    \
 768         .guid = { g0, g1, g2, g3, g4, g5, g6, g7,       \
 769                   g8, g9, ga, gb, gc, gd, ge, gf },
 770
 771 /*
 772  * Common header for Hyper-V ICs
 773  */
 774
 775 #define ICMSGTYPE_NEGOTIATE             0
 776 #define ICMSGTYPE_HEARTBEAT             1
 777 #define ICMSGTYPE_KVPEXCHANGE           2
 778 #define ICMSGTYPE_SHUTDOWN              3
 779 #define ICMSGTYPE_TIMESYNC              4
 780 #define ICMSGTYPE_VSS                   5
 781
 782 #define ICMSGHDRFLAG_TRANSACTION        1
 783 #define ICMSGHDRFLAG_REQUEST            2
 784 #define ICMSGHDRFLAG_RESPONSE           4
 785
 786 #define HV_S_OK                         0x00000000
 787 #define HV_E_FAIL                       0x80004005
 788 #define HV_ERROR_NOT_SUPPORTED          0x80070032
 789 #define HV_ERROR_MACHINE_LOCKED         0x800704F7
 790
 791 /*
 792  * While we want to handle util services as regular devices,
 793  * there is only one instance of each of these services; so
 794  * we statically allocate the service specific state.
 795  */
 796
 797 struct hv_util_service {
 798         u8 *recv_buffer;
 799         void (*util_cb)(void *);
 800         int (*util_init)(struct hv_util_service *);
 801         void (*util_deinit)(void);
 802 };
 803
 804 struct vmbuspipe_hdr {
 805         u32 flags;
 806         u32 msgsize;
 807 } __packed;
 808
 809 struct ic_version {
 810         u16 major;
 811         u16 minor;
 812 } __packed;
 813
 814 struct icmsg_hdr {
 815         struct ic_version icverframe;
 816         u16 icmsgtype;
 817         struct ic_version icvermsg;
 818         u16 icmsgsize;
 819         u32 status;
 820         u8 ictransaction_id;
 821         u8 icflags;
 822         u8 reserved[2];
 823 } __packed;
 824
 825 struct icmsg_negotiate {
 826         u16 icframe_vercnt;
 827         u16 icmsg_vercnt;
 828         u32 reserved;
 829         struct ic_version icversion_data[1]; /* any size array */
 830 } __packed;
 831
 832 struct shutdown_msg_data {
 833         u32 reason_code;
 834         u32 timeout_seconds;
 835         u32 flags;
 836         u8  display_message[2048];
 837 } __packed;
 838
 839 struct heartbeat_msg_data {
 840         u64 seq_num;
 841         u32 reserved[8];
 842 } __packed;
 843
 844 /* Time Sync IC defs */
 845 #define ICTIMESYNCFLAG_PROBE    0
 846 #define ICTIMESYNCFLAG_SYNC     1
 847 #define ICTIMESYNCFLAG_SAMPLE   2
 848
 849 #ifdef __x86_64__
 850 #define WLTIMEDELTA     116444736000000000L     /* in 100ns unit */
 851 #else
 852 #define WLTIMEDELTA     116444736000000000LL
 853 #endif
 854
 855 struct ictimesync_data {
 856         u64 parenttime;
 857         u64 childtime;
 858         u64 roundtriptime;
 859         u8 flags;
 860 } __packed;
 861
 862 struct hyperv_service_callback {
 863         u8 msg_type;
 864         char *log_msg;
 865         uuid_le data;
 866         struct vmbus_channel *channel;
 867         void (*callback) (void *context);
 868 };
 869
 870 extern void vmbus_prep_negotiate_resp(struct icmsg_hdr *,
 871                                       struct icmsg_negotiate *, u8 *);
 872
 873 #endif /* _HYPERV_H */