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/types.h>
  29
  30 /*
  31  * An implementation of HyperV key value pair (KVP) functionality for Linux.
  32  *
  33  *
  34  * Copyright (C) 2010, Novell, Inc.
  35  * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
  36  *
  37  */
  38
  39 /*
  40  * Maximum value size - used for both key names and value data, and includes
  41  * any applicable NULL terminators.
  42  *
  43  * Note:  This limit is somewhat arbitrary, but falls easily within what is
  44  * supported for all native guests (back to Win 2000) and what is reasonable
  45  * for the IC KVP exchange functionality.  Note that Windows Me/98/95 are
  46  * limited to 255 character key names.
  47  *
  48  * MSDN recommends not storing data values larger than 2048 bytes in the
  49  * registry.
  50  *
  51  * Note:  This value is used in defining the KVP exchange message - this value
  52  * cannot be modified without affecting the message size and compatibility.
  53  */
  54
  55 /*
  56  * bytes, including any null terminators
  57  */
  58 #define HV_KVP_EXCHANGE_MAX_VALUE_SIZE          (2048)
  59
  60
  61 /*
  62  * Maximum key size - the registry limit for the length of an entry name
  63  * is 256 characters, including the null terminator
  64  */
  65
  66 #define HV_KVP_EXCHANGE_MAX_KEY_SIZE            (512)
  67
  68 /*
  69  * In Linux, we implement the KVP functionality in two components:
  70  * 1) The kernel component which is packaged as part of the hv_utils driver
  71  * is responsible for communicating with the host and responsible for
  72  * implementing the host/guest protocol. 2) A user level daemon that is
  73  * responsible for data gathering.
  74  *
  75  * Host/Guest Protocol: The host iterates over an index and expects the guest
  76  * to assign a key name to the index and also return the value corresponding to
  77  * the key. The host will have atmost one KVP transaction outstanding at any
  78  * given point in time. The host side iteration stops when the guest returns
  79  * an error. Microsoft has specified the following mapping of key names to
  80  * host specified index:
  81  *
  82  *      Index           Key Name
  83  *      0               FullyQualifiedDomainName
  84  *      1               IntegrationServicesVersion
  85  *      2               NetworkAddressIPv4
  86  *      3               NetworkAddressIPv6
  87  *      4               OSBuildNumber
  88  *      5               OSName
  89  *      6               OSMajorVersion
  90  *      7               OSMinorVersion
  91  *      8               OSVersion
  92  *      9               ProcessorArchitecture
  93  *
  94  * The Windows host expects the Key Name and Key Value to be encoded in utf16.
  95  *
  96  * Guest Kernel/KVP Daemon Protocol: As noted earlier, we implement all of the
  97  * data gathering functionality in a user mode daemon. The user level daemon
  98  * is also responsible for binding the key name to the index as well. The
  99  * kernel and user-level daemon communicate using a connector channel.
 100  *
 101  * The user mode component first registers with the
 102  * the kernel component. Subsequently, the kernel component requests, data
 103  * for the specified keys. In response to this message the user mode component
 104  * fills in the value corresponding to the specified key. We overload the
 105  * sequence field in the cn_msg header to define our KVP message types.
 106  *
 107  *
 108  * The kernel component simply acts as a conduit for communication between the
 109  * Windows host and the user-level daemon. The kernel component passes up the
 110  * index received from the Host to the user-level daemon. If the index is
 111  * valid (supported), the corresponding key as well as its
 112  * value (both are strings) is returned. If the index is invalid
 113  * (not supported), a NULL key string is returned.
 114  */
 115
 116
 117 /*
 118  * Registry value types.
 119  */
 120
 121 #define REG_SZ 1
 122 #define REG_U32 4
 123 #define REG_U64 8
 124
 125 /*
 126  * As we look at expanding the KVP functionality to include
 127  * IP injection functionality, we need to maintain binary
 128  * compatibility with older daemons.
 129  *
 130  * The KVP opcodes are defined by the host and it was unfortunate
 131  * that I chose to treat the registration operation as part of the
 132  * KVP operations defined by the host.
 133  * Here is the level of compatibility
 134  * (between the user level daemon and the kernel KVP driver) that we
 135  * will implement:
 136  *
 137  * An older daemon will always be supported on a newer driver.
 138  * A given user level daemon will require a minimal version of the
 139  * kernel driver.
 140  * If we cannot handle the version differences, we will fail gracefully
 141  * (this can happen when we have a user level daemon that is more
 142  * advanced than the KVP driver.
 143  *
 144  * We will use values used in this handshake for determining if we have
 145  * workable user level daemon and the kernel driver. We begin by taking the
 146  * registration opcode out of the KVP opcode namespace. We will however,
 147  * maintain compatibility with the existing user-level daemon code.
 148  */
 149
 150 /*
 151  * Daemon code not supporting IP injection (legacy daemon).
 152  */
 153
 154 #define KVP_OP_REGISTER 4
 155
 156 /*
 157  * Daemon code supporting IP injection.
 158  * The KVP opcode field is used to communicate the
 159  * registration information; so define a namespace that
 160  * will be distinct from the host defined KVP opcode.
 161  */
 162
 163 #define KVP_OP_REGISTER1 100
 164
 165 enum hv_kvp_exchg_op {
 166         KVP_OP_GET = 0,
 167         KVP_OP_SET,
 168         KVP_OP_DELETE,
 169         KVP_OP_ENUMERATE,
 170         KVP_OP_GET_IP_INFO,
 171         KVP_OP_SET_IP_INFO,
 172         KVP_OP_COUNT /* Number of operations, must be last. */
 173 };
 174
 175 enum hv_kvp_exchg_pool {
 176         KVP_POOL_EXTERNAL = 0,
 177         KVP_POOL_GUEST,
 178         KVP_POOL_AUTO,
 179         KVP_POOL_AUTO_EXTERNAL,
 180         KVP_POOL_AUTO_INTERNAL,
 181         KVP_POOL_COUNT /* Number of pools, must be last. */
 182 };
 183
 184 /*
 185  * Some Hyper-V status codes.
 186  */
 187
 188 #define HV_S_OK                         0x00000000
 189 #define HV_E_FAIL                       0x80004005
 190 #define HV_S_CONT                       0x80070103
 191 #define HV_ERROR_NOT_SUPPORTED          0x80070032
 192 #define HV_ERROR_MACHINE_LOCKED         0x800704F7
 193 #define HV_ERROR_DEVICE_NOT_CONNECTED   0x8007048F
 194 #define HV_INVALIDARG                   0x80070057
 195 #define HV_GUID_NOTFOUND                0x80041002
 196
 197 #define ADDR_FAMILY_NONE        0x00
 198 #define ADDR_FAMILY_IPV4        0x01
 199 #define ADDR_FAMILY_IPV6        0x02
 200
 201 #define MAX_ADAPTER_ID_SIZE     128
 202 #define MAX_IP_ADDR_SIZE        1024
 203 #define MAX_GATEWAY_SIZE        512
 204
 205
 206 struct hv_kvp_ipaddr_value {
 207         __u16   adapter_id[MAX_ADAPTER_ID_SIZE];
 208         __u8    addr_family;
 209         __u8    dhcp_enabled;
 210         __u16   ip_addr[MAX_IP_ADDR_SIZE];
 211         __u16   sub_net[MAX_IP_ADDR_SIZE];
 212         __u16   gate_way[MAX_GATEWAY_SIZE];
 213         __u16   dns_addr[MAX_IP_ADDR_SIZE];
 214 } __attribute__((packed));
 215
 216
 217 struct hv_kvp_hdr {
 218         __u8 operation;
 219         __u8 pool;
 220         __u16 pad;
 221 } __attribute__((packed));
 222
 223 struct hv_kvp_exchg_msg_value {
 224         __u32 value_type;
 225         __u32 key_size;
 226         __u32 value_size;
 227         __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 228         union {
 229                 __u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 230                 __u32 value_u32;
 231                 __u64 value_u64;
 232         };
 233 } __attribute__((packed));
 234
 235 struct hv_kvp_msg_enumerate {
 236         __u32 index;
 237         struct hv_kvp_exchg_msg_value data;
 238 } __attribute__((packed));
 239
 240 struct hv_kvp_msg_get {
 241         struct hv_kvp_exchg_msg_value data;
 242 };
 243
 244 struct hv_kvp_msg_set {
 245         struct hv_kvp_exchg_msg_value data;
 246 };
 247
 248 struct hv_kvp_msg_delete {
 249         __u32 key_size;
 250         __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 251 };
 252
 253 struct hv_kvp_register {
 254         __u8 version[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 255 };
 256
 257 struct hv_kvp_msg {
 258         union {
 259                 struct hv_kvp_hdr       kvp_hdr;
 260                 int error;
 261         };
 262         union {
 263                 struct hv_kvp_msg_get           kvp_get;
 264                 struct hv_kvp_msg_set           kvp_set;
 265                 struct hv_kvp_msg_delete        kvp_delete;
 266                 struct hv_kvp_msg_enumerate     kvp_enum_data;
 267                 struct hv_kvp_ipaddr_value      kvp_ip_val;
 268                 struct hv_kvp_register          kvp_register;
 269         } body;
 270 } __attribute__((packed));
 271
 272 struct hv_kvp_ip_msg {
 273         __u8 operation;
 274         __u8 pool;
 275         struct hv_kvp_ipaddr_value      kvp_ip_val;
 276 } __attribute__((packed));
 277
 278 #ifdef __KERNEL__
 279 #include <linux/scatterlist.h>
 280 #include <linux/list.h>
 281 #include <linux/uuid.h>
 282 #include <linux/timer.h>
 283 #include <linux/workqueue.h>
 284 #include <linux/completion.h>
 285 #include <linux/device.h>
 286 #include <linux/mod_devicetable.h>
 287
 288
 289 #define MAX_PAGE_BUFFER_COUNT                           19
 290 #define MAX_MULTIPAGE_BUFFER_COUNT                      32 /* 128K */
 291
 292 #pragma pack(push, 1)
 293
 294 /* Single-page buffer */
 295 struct hv_page_buffer {
 296         u32 len;
 297         u32 offset;
 298         u64 pfn;
 299 };
 300
 301 /* Multiple-page buffer */
 302 struct hv_multipage_buffer {
 303         /* Length and Offset determines the # of pfns in the array */
 304         u32 len;
 305         u32 offset;
 306         u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
 307 };
 308
 309 /* 0x18 includes the proprietary packet header */
 310 #define MAX_PAGE_BUFFER_PACKET          (0x18 +                 \
 311                                         (sizeof(struct hv_page_buffer) * \
 312                                          MAX_PAGE_BUFFER_COUNT))
 313 #define MAX_MULTIPAGE_BUFFER_PACKET     (0x18 +                 \
 314                                          sizeof(struct hv_multipage_buffer))
 315
 316
 317 #pragma pack(pop)
 318
 319 struct hv_ring_buffer {
 320         /* Offset in bytes from the start of ring data below */
 321         u32 write_index;
 322
 323         /* Offset in bytes from the start of ring data below */
 324         u32 read_index;
 325
 326         u32 interrupt_mask;
 327
 328         /* Pad it to PAGE_SIZE so that data starts on page boundary */
 329         u8      reserved[4084];
 330
 331         /* NOTE:
 332          * The interrupt_mask field is used only for channels but since our
 333          * vmbus connection also uses this data structure and its data starts
 334          * here, we commented out this field.
 335          */
 336
 337         /*
 338          * Ring data starts here + RingDataStartOffset
 339          * !!! DO NOT place any fields below this !!!
 340          */
 341         u8 buffer[0];
 342 } __packed;
 343
 344 struct hv_ring_buffer_info {
 345         struct hv_ring_buffer *ring_buffer;
 346         u32 ring_size;                  /* Include the shared header */
 347         spinlock_t ring_lock;
 348
 349         u32 ring_datasize;              /* < ring_size */
 350         u32 ring_data_startoffset;
 351 };
 352
 353 struct hv_ring_buffer_debug_info {
 354         u32 current_interrupt_mask;
 355         u32 current_read_index;
 356         u32 current_write_index;
 357         u32 bytes_avail_toread;
 358         u32 bytes_avail_towrite;
 359 };
 360
 361
 362 /*
 363  *
 364  * hv_get_ringbuffer_availbytes()
 365  *
 366  * Get number of bytes available to read and to write to
 367  * for the specified ring buffer
 368  */
 369 static inline void
 370 hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
 371                           u32 *read, u32 *write)
 372 {
 373         u32 read_loc, write_loc, dsize;
 374
 375         smp_read_barrier_depends();
 376
 377         /* Capture the read/write indices before they changed */
 378         read_loc = rbi->ring_buffer->read_index;
 379         write_loc = rbi->ring_buffer->write_index;
 380         dsize = rbi->ring_datasize;
 381
 382         *write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
 383                 read_loc - write_loc;
 384         *read = dsize - *write;
 385 }
 386
 387
 388 /*
 389  * We use the same version numbering for all Hyper-V modules.
 390  *
 391  * Definition of versioning is as follows;
 392  *
 393  *      Major Number    Changes for these scenarios;
 394  *                      1.      When a new version of Windows Hyper-V
 395  *                              is released.
 396  *                      2.      A Major change has occurred in the
 397  *                              Linux IC's.
 398  *                      (For example the merge for the first time
 399  *                      into the kernel) Every time the Major Number
 400  *                      changes, the Revision number is reset to 0.
 401  *      Minor Number    Changes when new functionality is added
 402  *                      to the Linux IC's that is not a bug fix.
 403  *
 404  * 3.1 - Added completed hv_utils driver. Shutdown/Heartbeat/Timesync
 405  */
 406 #define HV_DRV_VERSION           "3.1"
 407
 408
 409 /*
 410  * A revision number of vmbus that is used for ensuring both ends on a
 411  * partition are using compatible versions.
 412  */
 413 #define VMBUS_REVISION_NUMBER           13
 414
 415 /* Make maximum size of pipe payload of 16K */
 416 #define MAX_PIPE_DATA_PAYLOAD           (sizeof(u8) * 16384)
 417
 418 /* Define PipeMode values. */
 419 #define VMBUS_PIPE_TYPE_BYTE            0x00000000
 420 #define VMBUS_PIPE_TYPE_MESSAGE         0x00000004
 421
 422 /* The size of the user defined data buffer for non-pipe offers. */
 423 #define MAX_USER_DEFINED_BYTES          120
 424
 425 /* The size of the user defined data buffer for pipe offers. */
 426 #define MAX_PIPE_USER_DEFINED_BYTES     116
 427
 428 /*
 429  * At the center of the Channel Management library is the Channel Offer. This
 430  * struct contains the fundamental information about an offer.
 431  */
 432 struct vmbus_channel_offer {
 433         uuid_le if_type;
 434         uuid_le if_instance;
 435         u64 int_latency; /* in 100ns units */
 436         u32 if_revision;
 437         u32 server_ctx_size;    /* in bytes */
 438         u16 chn_flags;
 439         u16 mmio_megabytes;             /* in bytes * 1024 * 1024 */
 440
 441         union {
 442                 /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
 443                 struct {
 444                         unsigned char user_def[MAX_USER_DEFINED_BYTES];
 445                 } std;
 446
 447                 /*
 448                  * Pipes:
 449                  * The following sructure is an integrated pipe protocol, which
 450                  * is implemented on top of standard user-defined data. Pipe
 451                  * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
 452                  * use.
 453                  */
 454                 struct {
 455                         u32  pipe_mode;
 456                         unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
 457                 } pipe;
 458         } u;
 459         u32 padding;
 460 } __packed;
 461
 462 /* Server Flags */
 463 #define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE        1
 464 #define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES    2
 465 #define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS            4
 466 #define VMBUS_CHANNEL_NAMED_PIPE_MODE                   0x10
 467 #define VMBUS_CHANNEL_LOOPBACK_OFFER                    0x100
 468 #define VMBUS_CHANNEL_PARENT_OFFER                      0x200
 469 #define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION    0x400
 470
 471 struct vmpacket_descriptor {
 472         u16 type;
 473         u16 offset8;
 474         u16 len8;
 475         u16 flags;
 476         u64 trans_id;
 477 } __packed;
 478
 479 struct vmpacket_header {
 480         u32 prev_pkt_start_offset;
 481         struct vmpacket_descriptor descriptor;
 482 } __packed;
 483
 484 struct vmtransfer_page_range {
 485         u32 byte_count;
 486         u32 byte_offset;
 487 } __packed;
 488
 489 struct vmtransfer_page_packet_header {
 490         struct vmpacket_descriptor d;
 491         u16 xfer_pageset_id;
 492         u8  sender_owns_set;
 493         u8 reserved;
 494         u32 range_cnt;
 495         struct vmtransfer_page_range ranges[1];
 496 } __packed;
 497
 498 struct vmgpadl_packet_header {
 499         struct vmpacket_descriptor d;
 500         u32 gpadl;
 501         u32 reserved;
 502 } __packed;
 503
 504 struct vmadd_remove_transfer_page_set {
 505         struct vmpacket_descriptor d;
 506         u32 gpadl;
 507         u16 xfer_pageset_id;
 508         u16 reserved;
 509 } __packed;
 510
 511 /*
 512  * This structure defines a range in guest physical space that can be made to
 513  * look virtually contiguous.
 514  */
 515 struct gpa_range {
 516         u32 byte_count;
 517         u32 byte_offset;
 518         u64 pfn_array[0];
 519 };
 520
 521 /*
 522  * This is the format for an Establish Gpadl packet, which contains a handle by
 523  * which this GPADL will be known and a set of GPA ranges associated with it.
 524  * This can be converted to a MDL by the guest OS.  If there are multiple GPA
 525  * ranges, then the resulting MDL will be "chained," representing multiple VA
 526  * ranges.
 527  */
 528 struct vmestablish_gpadl {
 529         struct vmpacket_descriptor d;
 530         u32 gpadl;
 531         u32 range_cnt;
 532         struct gpa_range range[1];
 533 } __packed;
 534
 535 /*
 536  * This is the format for a Teardown Gpadl packet, which indicates that the
 537  * GPADL handle in the Establish Gpadl packet will never be referenced again.
 538  */
 539 struct vmteardown_gpadl {
 540         struct vmpacket_descriptor d;
 541         u32 gpadl;
 542         u32 reserved;   /* for alignment to a 8-byte boundary */
 543 } __packed;
 544
 545 /*
 546  * This is the format for a GPA-Direct packet, which contains a set of GPA
 547  * ranges, in addition to commands and/or data.
 548  */
 549 struct vmdata_gpa_direct {
 550         struct vmpacket_descriptor d;
 551         u32 reserved;
 552         u32 range_cnt;
 553         struct gpa_range range[1];
 554 } __packed;
 555
 556 /* This is the format for a Additional Data Packet. */
 557 struct vmadditional_data {
 558         struct vmpacket_descriptor d;
 559         u64 total_bytes;
 560         u32 offset;
 561         u32 byte_cnt;
 562         unsigned char data[1];
 563 } __packed;
 564
 565 union vmpacket_largest_possible_header {
 566         struct vmpacket_descriptor simple_hdr;
 567         struct vmtransfer_page_packet_header xfer_page_hdr;
 568         struct vmgpadl_packet_header gpadl_hdr;
 569         struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
 570         struct vmestablish_gpadl establish_gpadl_hdr;
 571         struct vmteardown_gpadl teardown_gpadl_hdr;
 572         struct vmdata_gpa_direct data_gpa_direct_hdr;
 573 };
 574
 575 #define VMPACKET_DATA_START_ADDRESS(__packet)   \
 576         (void *)(((unsigned char *)__packet) +  \
 577          ((struct vmpacket_descriptor)__packet)->offset8 * 8)
 578
 579 #define VMPACKET_DATA_LENGTH(__packet)          \
 580         ((((struct vmpacket_descriptor)__packet)->len8 -        \
 581           ((struct vmpacket_descriptor)__packet)->offset8) * 8)
 582
 583 #define VMPACKET_TRANSFER_MODE(__packet)        \
 584         (((struct IMPACT)__packet)->type)
 585
 586 enum vmbus_packet_type {
 587         VM_PKT_INVALID                          = 0x0,
 588         VM_PKT_SYNCH                            = 0x1,
 589         VM_PKT_ADD_XFER_PAGESET                 = 0x2,
 590         VM_PKT_RM_XFER_PAGESET                  = 0x3,
 591         VM_PKT_ESTABLISH_GPADL                  = 0x4,
 592         VM_PKT_TEARDOWN_GPADL                   = 0x5,
 593         VM_PKT_DATA_INBAND                      = 0x6,
 594         VM_PKT_DATA_USING_XFER_PAGES            = 0x7,
 595         VM_PKT_DATA_USING_GPADL                 = 0x8,
 596         VM_PKT_DATA_USING_GPA_DIRECT            = 0x9,
 597         VM_PKT_CANCEL_REQUEST                   = 0xa,
 598         VM_PKT_COMP                             = 0xb,
 599         VM_PKT_DATA_USING_ADDITIONAL_PKT        = 0xc,
 600         VM_PKT_ADDITIONAL_DATA                  = 0xd
 601 };
 602
 603 #define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED     1
 604
 605
 606 /* Version 1 messages */
 607 enum vmbus_channel_message_type {
 608         CHANNELMSG_INVALID                      =  0,
 609         CHANNELMSG_OFFERCHANNEL         =  1,
 610         CHANNELMSG_RESCIND_CHANNELOFFER =  2,
 611         CHANNELMSG_REQUESTOFFERS                =  3,
 612         CHANNELMSG_ALLOFFERS_DELIVERED  =  4,
 613         CHANNELMSG_OPENCHANNEL          =  5,
 614         CHANNELMSG_OPENCHANNEL_RESULT           =  6,
 615         CHANNELMSG_CLOSECHANNEL         =  7,
 616         CHANNELMSG_GPADL_HEADER         =  8,
 617         CHANNELMSG_GPADL_BODY                   =  9,
 618         CHANNELMSG_GPADL_CREATED                = 10,
 619         CHANNELMSG_GPADL_TEARDOWN               = 11,
 620         CHANNELMSG_GPADL_TORNDOWN               = 12,
 621         CHANNELMSG_RELID_RELEASED               = 13,
 622         CHANNELMSG_INITIATE_CONTACT             = 14,
 623         CHANNELMSG_VERSION_RESPONSE             = 15,
 624         CHANNELMSG_UNLOAD                       = 16,
 625 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
 626         CHANNELMSG_VIEWRANGE_ADD                = 17,
 627         CHANNELMSG_VIEWRANGE_REMOVE             = 18,
 628 #endif
 629         CHANNELMSG_COUNT
 630 };
 631
 632 struct vmbus_channel_message_header {
 633         enum vmbus_channel_message_type msgtype;
 634         u32 padding;
 635 } __packed;
 636
 637 /* Query VMBus Version parameters */
 638 struct vmbus_channel_query_vmbus_version {
 639         struct vmbus_channel_message_header header;
 640         u32 version;
 641 } __packed;
 642
 643 /* VMBus Version Supported parameters */
 644 struct vmbus_channel_version_supported {
 645         struct vmbus_channel_message_header header;
 646         u8 version_supported;
 647 } __packed;
 648
 649 /* Offer Channel parameters */
 650 struct vmbus_channel_offer_channel {
 651         struct vmbus_channel_message_header header;
 652         struct vmbus_channel_offer offer;
 653         u32 child_relid;
 654         u8 monitorid;
 655         u8 monitor_allocated;
 656 } __packed;
 657
 658 /* Rescind Offer parameters */
 659 struct vmbus_channel_rescind_offer {
 660         struct vmbus_channel_message_header header;
 661         u32 child_relid;
 662 } __packed;
 663
 664 /*
 665  * Request Offer -- no parameters, SynIC message contains the partition ID
 666  * Set Snoop -- no parameters, SynIC message contains the partition ID
 667  * Clear Snoop -- no parameters, SynIC message contains the partition ID
 668  * All Offers Delivered -- no parameters, SynIC message contains the partition
 669  *                         ID
 670  * Flush Client -- no parameters, SynIC message contains the partition ID
 671  */
 672
 673 /* Open Channel parameters */
 674 struct vmbus_channel_open_channel {
 675         struct vmbus_channel_message_header header;
 676
 677         /* Identifies the specific VMBus channel that is being opened. */
 678         u32 child_relid;
 679
 680         /* ID making a particular open request at a channel offer unique. */
 681         u32 openid;
 682
 683         /* GPADL for the channel's ring buffer. */
 684         u32 ringbuffer_gpadlhandle;
 685
 686         /* GPADL for the channel's server context save area. */
 687         u32 server_contextarea_gpadlhandle;
 688
 689         /*
 690         * The upstream ring buffer begins at offset zero in the memory
 691         * described by RingBufferGpadlHandle. The downstream ring buffer
 692         * follows it at this offset (in pages).
 693         */
 694         u32 downstream_ringbuffer_pageoffset;
 695
 696         /* User-specific data to be passed along to the server endpoint. */
 697         unsigned char userdata[MAX_USER_DEFINED_BYTES];
 698 } __packed;
 699
 700 /* Open Channel Result parameters */
 701 struct vmbus_channel_open_result {
 702         struct vmbus_channel_message_header header;
 703         u32 child_relid;
 704         u32 openid;
 705         u32 status;
 706 } __packed;
 707
 708 /* Close channel parameters; */
 709 struct vmbus_channel_close_channel {
 710         struct vmbus_channel_message_header header;
 711         u32 child_relid;
 712 } __packed;
 713
 714 /* Channel Message GPADL */
 715 #define GPADL_TYPE_RING_BUFFER          1
 716 #define GPADL_TYPE_SERVER_SAVE_AREA     2
 717 #define GPADL_TYPE_TRANSACTION          8
 718
 719 /*
 720  * The number of PFNs in a GPADL message is defined by the number of
 721  * pages that would be spanned by ByteCount and ByteOffset.  If the
 722  * implied number of PFNs won't fit in this packet, there will be a
 723  * follow-up packet that contains more.
 724  */
 725 struct vmbus_channel_gpadl_header {
 726         struct vmbus_channel_message_header header;
 727         u32 child_relid;
 728         u32 gpadl;
 729         u16 range_buflen;
 730         u16 rangecount;
 731         struct gpa_range range[0];
 732 } __packed;
 733
 734 /* This is the followup packet that contains more PFNs. */
 735 struct vmbus_channel_gpadl_body {
 736         struct vmbus_channel_message_header header;
 737         u32 msgnumber;
 738         u32 gpadl;
 739         u64 pfn[0];
 740 } __packed;
 741
 742 struct vmbus_channel_gpadl_created {
 743         struct vmbus_channel_message_header header;
 744         u32 child_relid;
 745         u32 gpadl;
 746         u32 creation_status;
 747 } __packed;
 748
 749 struct vmbus_channel_gpadl_teardown {
 750         struct vmbus_channel_message_header header;
 751         u32 child_relid;
 752         u32 gpadl;
 753 } __packed;
 754
 755 struct vmbus_channel_gpadl_torndown {
 756         struct vmbus_channel_message_header header;
 757         u32 gpadl;
 758 } __packed;
 759
 760 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
 761 struct vmbus_channel_view_range_add {
 762         struct vmbus_channel_message_header header;
 763         PHYSICAL_ADDRESS viewrange_base;
 764         u64 viewrange_length;
 765         u32 child_relid;
 766 } __packed;
 767
 768 struct vmbus_channel_view_range_remove {
 769         struct vmbus_channel_message_header header;
 770         PHYSICAL_ADDRESS viewrange_base;
 771         u32 child_relid;
 772 } __packed;
 773 #endif
 774
 775 struct vmbus_channel_relid_released {
 776         struct vmbus_channel_message_header header;
 777         u32 child_relid;
 778 } __packed;
 779
 780 struct vmbus_channel_initiate_contact {
 781         struct vmbus_channel_message_header header;
 782         u32 vmbus_version_requested;
 783         u32 padding2;
 784         u64 interrupt_page;
 785         u64 monitor_page1;
 786         u64 monitor_page2;
 787 } __packed;
 788
 789 struct vmbus_channel_version_response {
 790         struct vmbus_channel_message_header header;
 791         u8 version_supported;
 792 } __packed;
 793
 794 enum vmbus_channel_state {
 795         CHANNEL_OFFER_STATE,
 796         CHANNEL_OPENING_STATE,
 797         CHANNEL_OPEN_STATE,
 798 };
 799
 800 struct vmbus_channel_debug_info {
 801         u32 relid;
 802         enum vmbus_channel_state state;
 803         uuid_le interfacetype;
 804         uuid_le interface_instance;
 805         u32 monitorid;
 806         u32 servermonitor_pending;
 807         u32 servermonitor_latency;
 808         u32 servermonitor_connectionid;
 809         u32 clientmonitor_pending;
 810         u32 clientmonitor_latency;
 811         u32 clientmonitor_connectionid;
 812
 813         struct hv_ring_buffer_debug_info inbound;
 814         struct hv_ring_buffer_debug_info outbound;
 815 };
 816
 817 /*
 818  * Represents each channel msg on the vmbus connection This is a
 819  * variable-size data structure depending on the msg type itself
 820  */
 821 struct vmbus_channel_msginfo {
 822         /* Bookkeeping stuff */
 823         struct list_head msglistentry;
 824
 825         /* So far, this is only used to handle gpadl body message */
 826         struct list_head submsglist;
 827
 828         /* Synchronize the request/response if needed */
 829         struct completion  waitevent;
 830         union {
 831                 struct vmbus_channel_version_supported version_supported;
 832                 struct vmbus_channel_open_result open_result;
 833                 struct vmbus_channel_gpadl_torndown gpadl_torndown;
 834                 struct vmbus_channel_gpadl_created gpadl_created;
 835                 struct vmbus_channel_version_response version_response;
 836         } response;
 837
 838         u32 msgsize;
 839         /*
 840          * The channel message that goes out on the "wire".
 841          * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
 842          */
 843         unsigned char msg[0];
 844 };
 845
 846 struct vmbus_close_msg {
 847         struct vmbus_channel_msginfo info;
 848         struct vmbus_channel_close_channel msg;
 849 };
 850
 851 struct vmbus_channel {
 852         struct list_head listentry;
 853
 854         struct hv_device *device_obj;
 855
 856         struct work_struct work;
 857
 858         enum vmbus_channel_state state;
 859
 860         struct vmbus_channel_offer_channel offermsg;
 861         /*
 862          * These are based on the OfferMsg.MonitorId.
 863          * Save it here for easy access.
 864          */
 865         u8 monitor_grp;
 866         u8 monitor_bit;
 867
 868         u32 ringbuffer_gpadlhandle;
 869
 870         /* Allocated memory for ring buffer */
 871         void *ringbuffer_pages;
 872         u32 ringbuffer_pagecount;
 873         struct hv_ring_buffer_info outbound;    /* send to parent */
 874         struct hv_ring_buffer_info inbound;     /* receive from parent */
 875         spinlock_t inbound_lock;
 876         struct workqueue_struct *controlwq;
 877
 878         struct vmbus_close_msg close_msg;
 879
 880         /* Channel callback are invoked in this workqueue context */
 881         /* HANDLE dataWorkQueue; */
 882
 883         void (*onchannel_callback)(void *context);
 884         void *channel_callback_context;
 885 };
 886
 887 void vmbus_onmessage(void *context);
 888
 889 int vmbus_request_offers(void);
 890
 891 /* The format must be the same as struct vmdata_gpa_direct */
 892 struct vmbus_channel_packet_page_buffer {
 893         u16 type;
 894         u16 dataoffset8;
 895         u16 length8;
 896         u16 flags;
 897         u64 transactionid;
 898         u32 reserved;
 899         u32 rangecount;
 900         struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
 901 } __packed;
 902
 903 /* The format must be the same as struct vmdata_gpa_direct */
 904 struct vmbus_channel_packet_multipage_buffer {
 905         u16 type;
 906         u16 dataoffset8;
 907         u16 length8;
 908         u16 flags;
 909         u64 transactionid;
 910         u32 reserved;
 911         u32 rangecount;         /* Always 1 in this case */
 912         struct hv_multipage_buffer range;
 913 } __packed;
 914
 915
 916 extern int vmbus_open(struct vmbus_channel *channel,
 917                             u32 send_ringbuffersize,
 918                             u32 recv_ringbuffersize,
 919                             void *userdata,
 920                             u32 userdatalen,
 921                             void(*onchannel_callback)(void *context),
 922                             void *context);
 923
 924 extern void vmbus_close(struct vmbus_channel *channel);
 925
 926 extern int vmbus_sendpacket(struct vmbus_channel *channel,
 927                                   const void *buffer,
 928                                   u32 bufferLen,
 929                                   u64 requestid,
 930                                   enum vmbus_packet_type type,
 931                                   u32 flags);
 932
 933 extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
 934                                             struct hv_page_buffer pagebuffers[],
 935                                             u32 pagecount,
 936                                             void *buffer,
 937                                             u32 bufferlen,
 938                                             u64 requestid);
 939
 940 extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
 941                                         struct hv_multipage_buffer *mpb,
 942                                         void *buffer,
 943                                         u32 bufferlen,
 944                                         u64 requestid);
 945
 946 extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
 947                                       void *kbuffer,
 948                                       u32 size,
 949                                       u32 *gpadl_handle);
 950
 951 extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
 952                                      u32 gpadl_handle);
 953
 954 extern int vmbus_recvpacket(struct vmbus_channel *channel,
 955                                   void *buffer,
 956                                   u32 bufferlen,
 957                                   u32 *buffer_actual_len,
 958                                   u64 *requestid);
 959
 960 extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
 961                                      void *buffer,
 962                                      u32 bufferlen,
 963                                      u32 *buffer_actual_len,
 964                                      u64 *requestid);
 965
 966
 967 extern void vmbus_get_debug_info(struct vmbus_channel *channel,
 968                                      struct vmbus_channel_debug_info *debug);
 969
 970 extern void vmbus_ontimer(unsigned long data);
 971
 972 struct hv_dev_port_info {
 973         u32 int_mask;
 974         u32 read_idx;
 975         u32 write_idx;
 976         u32 bytes_avail_toread;
 977         u32 bytes_avail_towrite;
 978 };
 979
 980 /* Base driver object */
 981 struct hv_driver {
 982         const char *name;
 983
 984         /* the device type supported by this driver */
 985         uuid_le dev_type;
 986         const struct hv_vmbus_device_id *id_table;
 987
 988         struct device_driver driver;
 989
 990         int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
 991         int (*remove)(struct hv_device *);
 992         void (*shutdown)(struct hv_device *);
 993
 994 };
 995
 996 /* Base device object */
 997 struct hv_device {
 998         /* the device type id of this device */
 999         uuid_le dev_type;
1000
1001         /* the device instance id of this device */
1002         uuid_le dev_instance;
1003
1004         struct device device;
1005
1006         struct vmbus_channel *channel;
1007 };
1008
1009
1010 static inline struct hv_device *device_to_hv_device(struct device *d)
1011 {
1012         return container_of(d, struct hv_device, device);
1013 }
1014
1015 static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
1016 {
1017         return container_of(d, struct hv_driver, driver);
1018 }
1019
1020 static inline void hv_set_drvdata(struct hv_device *dev, void *data)
1021 {
1022         dev_set_drvdata(&dev->device, data);
1023 }
1024
1025 static inline void *hv_get_drvdata(struct hv_device *dev)
1026 {
1027         return dev_get_drvdata(&dev->device);
1028 }
1029
1030 /* Vmbus interface */
1031 #define vmbus_driver_register(driver)   \
1032         __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
1033 int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
1034                                          struct module *owner,
1035                                          const char *mod_name);
1036 void vmbus_driver_unregister(struct hv_driver *hv_driver);
1037
1038 /**
1039  * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
1040  *
1041  * This macro is used to create a struct hv_vmbus_device_id that matches a
1042  * specific device.
1043  */
1044 #define VMBUS_DEVICE(g0, g1, g2, g3, g4, g5, g6, g7,    \
1045                      g8, g9, ga, gb, gc, gd, ge, gf)    \
1046         .guid = { g0, g1, g2, g3, g4, g5, g6, g7,       \
1047                   g8, g9, ga, gb, gc, gd, ge, gf },
1048
1049 /*
1050  * Common header for Hyper-V ICs
1051  */
1052
1053 #define ICMSGTYPE_NEGOTIATE             0
1054 #define ICMSGTYPE_HEARTBEAT             1
1055 #define ICMSGTYPE_KVPEXCHANGE           2
1056 #define ICMSGTYPE_SHUTDOWN              3
1057 #define ICMSGTYPE_TIMESYNC              4
1058 #define ICMSGTYPE_VSS                   5
1059
1060 #define ICMSGHDRFLAG_TRANSACTION        1
1061 #define ICMSGHDRFLAG_REQUEST            2
1062 #define ICMSGHDRFLAG_RESPONSE           4
1063
1064
1065 /*
1066  * While we want to handle util services as regular devices,
1067  * there is only one instance of each of these services; so
1068  * we statically allocate the service specific state.
1069  */
1070
1071 struct hv_util_service {
1072         u8 *recv_buffer;
1073         void (*util_cb)(void *);
1074         int (*util_init)(struct hv_util_service *);
1075         void (*util_deinit)(void);
1076 };
1077
1078 struct vmbuspipe_hdr {
1079         u32 flags;
1080         u32 msgsize;
1081 } __packed;
1082
1083 struct ic_version {
1084         u16 major;
1085         u16 minor;
1086 } __packed;
1087
1088 struct icmsg_hdr {
1089         struct ic_version icverframe;
1090         u16 icmsgtype;
1091         struct ic_version icvermsg;
1092         u16 icmsgsize;
1093         u32 status;
1094         u8 ictransaction_id;
1095         u8 icflags;
1096         u8 reserved[2];
1097 } __packed;
1098
1099 struct icmsg_negotiate {
1100         u16 icframe_vercnt;
1101         u16 icmsg_vercnt;
1102         u32 reserved;
1103         struct ic_version icversion_data[1]; /* any size array */
1104 } __packed;
1105
1106 struct shutdown_msg_data {
1107         u32 reason_code;
1108         u32 timeout_seconds;
1109         u32 flags;
1110         u8  display_message[2048];
1111 } __packed;
1112
1113 struct heartbeat_msg_data {
1114         u64 seq_num;
1115         u32 reserved[8];
1116 } __packed;
1117
1118 /* Time Sync IC defs */
1119 #define ICTIMESYNCFLAG_PROBE    0
1120 #define ICTIMESYNCFLAG_SYNC     1
1121 #define ICTIMESYNCFLAG_SAMPLE   2
1122
1123 #ifdef __x86_64__
1124 #define WLTIMEDELTA     116444736000000000L     /* in 100ns unit */
1125 #else
1126 #define WLTIMEDELTA     116444736000000000LL
1127 #endif
1128
1129 struct ictimesync_data {
1130         u64 parenttime;
1131         u64 childtime;
1132         u64 roundtriptime;
1133         u8 flags;
1134 } __packed;
1135
1136 struct hyperv_service_callback {
1137         u8 msg_type;
1138         char *log_msg;
1139         uuid_le data;
1140         struct vmbus_channel *channel;
1141         void (*callback) (void *context);
1142 };
1143
1144 #define MAX_SRV_VER     0x7ffffff
1145 extern void vmbus_prep_negotiate_resp(struct icmsg_hdr *,
1146                                         struct icmsg_negotiate *, u8 *, int,
1147                                         int);
1148
1149 int hv_kvp_init(struct hv_util_service *);
1150 void hv_kvp_deinit(void);
1151 void hv_kvp_onchannelcallback(void *);
1152
1153 #endif /* __KERNEL__ */
1154 #endif /* _HYPERV_H */