drivers/hv/hyperv_vmbus.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_VMBUS_H
  26 #define _HYPERV_VMBUS_H
  27
  28 #include <linux/list.h>
  29 #include <asm/sync_bitops.h>
  30 #include <linux/atomic.h>
  31 #include <linux/hyperv.h>
  32
  33 /*
  34  * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
  35  * is set by CPUID(HVCPUID_VERSION_FEATURES).
  36  */
  37 enum hv_cpuid_function {
  38         HVCPUID_VERSION_FEATURES                = 0x00000001,
  39         HVCPUID_VENDOR_MAXFUNCTION              = 0x40000000,
  40         HVCPUID_INTERFACE                       = 0x40000001,
  41
  42         /*
  43          * The remaining functions depend on the value of
  44          * HVCPUID_INTERFACE
  45          */
  46         HVCPUID_VERSION                 = 0x40000002,
  47         HVCPUID_FEATURES                        = 0x40000003,
  48         HVCPUID_ENLIGHTENMENT_INFO      = 0x40000004,
  49         HVCPUID_IMPLEMENTATION_LIMITS           = 0x40000005,
  50 };
  51
  52 /* Define version of the synthetic interrupt controller. */
  53 #define HV_SYNIC_VERSION                (1)
  54
  55 /* Define the expected SynIC version. */
  56 #define HV_SYNIC_VERSION_1              (0x1)
  57
  58 /* Define synthetic interrupt controller message constants. */
  59 #define HV_MESSAGE_SIZE                 (256)
  60 #define HV_MESSAGE_PAYLOAD_BYTE_COUNT   (240)
  61 #define HV_MESSAGE_PAYLOAD_QWORD_COUNT  (30)
  62 #define HV_ANY_VP                       (0xFFFFFFFF)
  63
  64 /* Define synthetic interrupt controller flag constants. */
  65 #define HV_EVENT_FLAGS_COUNT            (256 * 8)
  66 #define HV_EVENT_FLAGS_BYTE_COUNT       (256)
  67 #define HV_EVENT_FLAGS_DWORD_COUNT      (256 / sizeof(u32))
  68
  69 /* Define hypervisor message types. */
  70 enum hv_message_type {
  71         HVMSG_NONE                      = 0x00000000,
  72
  73         /* Memory access messages. */
  74         HVMSG_UNMAPPED_GPA              = 0x80000000,
  75         HVMSG_GPA_INTERCEPT             = 0x80000001,
  76
  77         /* Timer notification messages. */
  78         HVMSG_TIMER_EXPIRED                     = 0x80000010,
  79
  80         /* Error messages. */
  81         HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
  82         HVMSG_UNRECOVERABLE_EXCEPTION   = 0x80000021,
  83         HVMSG_UNSUPPORTED_FEATURE               = 0x80000022,
  84
  85         /* Trace buffer complete messages. */
  86         HVMSG_EVENTLOG_BUFFERCOMPLETE   = 0x80000040,
  87
  88         /* Platform-specific processor intercept messages. */
  89         HVMSG_X64_IOPORT_INTERCEPT              = 0x80010000,
  90         HVMSG_X64_MSR_INTERCEPT         = 0x80010001,
  91         HVMSG_X64_CPUID_INTERCEPT               = 0x80010002,
  92         HVMSG_X64_EXCEPTION_INTERCEPT   = 0x80010003,
  93         HVMSG_X64_APIC_EOI                      = 0x80010004,
  94         HVMSG_X64_LEGACY_FP_ERROR               = 0x80010005
  95 };
  96
  97 /* Define the number of synthetic interrupt sources. */
  98 #define HV_SYNIC_SINT_COUNT             (16)
  99 #define HV_SYNIC_STIMER_COUNT           (4)
 100
 101 /* Define invalid partition identifier. */
 102 #define HV_PARTITION_ID_INVALID         ((u64)0x0)
 103
 104 /* Define port identifier type. */
 105 union hv_port_id {
 106         u32 asu32;
 107         struct {
 108                 u32 id:24;
 109                 u32 reserved:8;
 110         } u ;
 111 };
 112
 113 /* Define port type. */
 114 enum hv_port_type {
 115         HVPORT_MSG      = 1,
 116         HVPORT_EVENT            = 2,
 117         HVPORT_MONITOR  = 3
 118 };
 119
 120 /* Define port information structure. */
 121 struct hv_port_info {
 122         enum hv_port_type port_type;
 123         u32 padding;
 124         union {
 125                 struct {
 126                         u32 target_sint;
 127                         u32 target_vp;
 128                         u64 rsvdz;
 129                 } message_port_info;
 130                 struct {
 131                         u32 target_sint;
 132                         u32 target_vp;
 133                         u16 base_flag_bumber;
 134                         u16 flag_count;
 135                         u32 rsvdz;
 136                 } event_port_info;
 137                 struct {
 138                         u64 monitor_address;
 139                         u64 rsvdz;
 140                 } monitor_port_info;
 141         };
 142 };
 143
 144 struct hv_connection_info {
 145         enum hv_port_type port_type;
 146         u32 padding;
 147         union {
 148                 struct {
 149                         u64 rsvdz;
 150                 } message_connection_info;
 151                 struct {
 152                         u64 rsvdz;
 153                 } event_connection_info;
 154                 struct {
 155                         u64 monitor_address;
 156                 } monitor_connection_info;
 157         };
 158 };
 159
 160 /* Define synthetic interrupt controller message flags. */
 161 union hv_message_flags {
 162         u8 asu8;
 163         struct {
 164                 u8 msg_pending:1;
 165                 u8 reserved:7;
 166         };
 167 };
 168
 169 /* Define synthetic interrupt controller message header. */
 170 struct hv_message_header {
 171         enum hv_message_type message_type;
 172         u8 payload_size;
 173         union hv_message_flags message_flags;
 174         u8 reserved[2];
 175         union {
 176                 u64 sender;
 177                 union hv_port_id port;
 178         };
 179 };
 180
 181 /*
 182  * Timer configuration register.
 183  */
 184 union hv_timer_config {
 185         u64 as_uint64;
 186         struct {
 187                 u64 enable:1;
 188                 u64 periodic:1;
 189                 u64 lazy:1;
 190                 u64 auto_enable:1;
 191                 u64 reserved_z0:12;
 192                 u64 sintx:4;
 193                 u64 reserved_z1:44;
 194         };
 195 };
 196
 197
 198 /* Define timer message payload structure. */
 199 struct hv_timer_message_payload {
 200         u32 timer_index;
 201         u32 reserved;
 202         u64 expiration_time;    /* When the timer expired */
 203         u64 delivery_time;      /* When the message was delivered */
 204 };
 205
 206 /* Define synthetic interrupt controller message format. */
 207 struct hv_message {
 208         struct hv_message_header header;
 209         union {
 210                 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 211         } u ;
 212 };
 213
 214 /* Define the number of message buffers associated with each port. */
 215 #define HV_PORT_MESSAGE_BUFFER_COUNT    (16)
 216
 217 /* Define the synthetic interrupt message page layout. */
 218 struct hv_message_page {
 219         struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
 220 };
 221
 222 /* Define the synthetic interrupt controller event flags format. */
 223 union hv_synic_event_flags {
 224         u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
 225         u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
 226 };
 227
 228 /* Define the synthetic interrupt flags page layout. */
 229 struct hv_synic_event_flags_page {
 230         union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
 231 };
 232
 233 /* Define SynIC control register. */
 234 union hv_synic_scontrol {
 235         u64 as_uint64;
 236         struct {
 237                 u64 enable:1;
 238                 u64 reserved:63;
 239         };
 240 };
 241
 242 /* Define synthetic interrupt source. */
 243 union hv_synic_sint {
 244         u64 as_uint64;
 245         struct {
 246                 u64 vector:8;
 247                 u64 reserved1:8;
 248                 u64 masked:1;
 249                 u64 auto_eoi:1;
 250                 u64 reserved2:46;
 251         };
 252 };
 253
 254 /* Define the format of the SIMP register */
 255 union hv_synic_simp {
 256         u64 as_uint64;
 257         struct {
 258                 u64 simp_enabled:1;
 259                 u64 preserved:11;
 260                 u64 base_simp_gpa:52;
 261         };
 262 };
 263
 264 /* Define the format of the SIEFP register */
 265 union hv_synic_siefp {
 266         u64 as_uint64;
 267         struct {
 268                 u64 siefp_enabled:1;
 269                 u64 preserved:11;
 270                 u64 base_siefp_gpa:52;
 271         };
 272 };
 273
 274 /* Definitions for the monitored notification facility */
 275 union hv_monitor_trigger_group {
 276         u64 as_uint64;
 277         struct {
 278                 u32 pending;
 279                 u32 armed;
 280         };
 281 };
 282
 283 struct hv_monitor_parameter {
 284         union hv_connection_id connectionid;
 285         u16 flagnumber;
 286         u16 rsvdz;
 287 };
 288
 289 union hv_monitor_trigger_state {
 290         u32 asu32;
 291
 292         struct {
 293                 u32 group_enable:4;
 294                 u32 rsvdz:28;
 295         };
 296 };
 297
 298 /* struct hv_monitor_page Layout */
 299 /* ------------------------------------------------------ */
 300 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
 301 /* | 8   | TriggerGroup[0]                              | */
 302 /* | 10  | TriggerGroup[1]                              | */
 303 /* | 18  | TriggerGroup[2]                              | */
 304 /* | 20  | TriggerGroup[3]                              | */
 305 /* | 28  | Rsvd2[0]                                     | */
 306 /* | 30  | Rsvd2[1]                                     | */
 307 /* | 38  | Rsvd2[2]                                     | */
 308 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
 309 /* | ...                                                | */
 310 /* | 240 | Latency[0][0..3]                             | */
 311 /* | 340 | Rsvz3[0]                                     | */
 312 /* | 440 | Parameter[0][0]                              | */
 313 /* | 448 | Parameter[0][1]                              | */
 314 /* | ...                                                | */
 315 /* | 840 | Rsvd4[0]                                     | */
 316 /* ------------------------------------------------------ */
 317 struct hv_monitor_page {
 318         union hv_monitor_trigger_state trigger_state;
 319         u32 rsvdz1;
 320
 321         union hv_monitor_trigger_group trigger_group[4];
 322         u64 rsvdz2[3];
 323
 324         s32 next_checktime[4][32];
 325
 326         u16 latency[4][32];
 327         u64 rsvdz3[32];
 328
 329         struct hv_monitor_parameter parameter[4][32];
 330
 331         u8 rsvdz4[1984];
 332 };
 333
 334 /* Declare the various hypercall operations. */
 335 enum hv_call_code {
 336         HVCALL_POST_MESSAGE     = 0x005c,
 337         HVCALL_SIGNAL_EVENT     = 0x005d,
 338 };
 339
 340 /* Definition of the hv_post_message hypercall input structure. */
 341 struct hv_input_post_message {
 342         union hv_connection_id connectionid;
 343         u32 reserved;
 344         enum hv_message_type message_type;
 345         u32 payload_size;
 346         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 347 };
 348
 349 /*
 350  * Versioning definitions used for guests reporting themselves to the
 351  * hypervisor, and visa versa.
 352  */
 353
 354 /* Version info reported by guest OS's */
 355 enum hv_guest_os_vendor {
 356         HVGUESTOS_VENDOR_MICROSOFT      = 0x0001
 357 };
 358
 359 enum hv_guest_os_microsoft_ids {
 360         HVGUESTOS_MICROSOFT_UNDEFINED   = 0x00,
 361         HVGUESTOS_MICROSOFT_MSDOS               = 0x01,
 362         HVGUESTOS_MICROSOFT_WINDOWS3X   = 0x02,
 363         HVGUESTOS_MICROSOFT_WINDOWS9X   = 0x03,
 364         HVGUESTOS_MICROSOFT_WINDOWSNT   = 0x04,
 365         HVGUESTOS_MICROSOFT_WINDOWSCE   = 0x05
 366 };
 367
 368 /*
 369  * Declare the MSR used to identify the guest OS.
 370  */
 371 #define HV_X64_MSR_GUEST_OS_ID  0x40000000
 372
 373 union hv_x64_msr_guest_os_id_contents {
 374         u64 as_uint64;
 375         struct {
 376                 u64 build_number:16;
 377                 u64 service_version:8; /* Service Pack, etc. */
 378                 u64 minor_version:8;
 379                 u64 major_version:8;
 380                 u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
 381                 u64 vendor_id:16; /* enum hv_guest_os_vendor */
 382         };
 383 };
 384
 385 /*
 386  * Declare the MSR used to setup pages used to communicate with the hypervisor.
 387  */
 388 #define HV_X64_MSR_HYPERCALL    0x40000001
 389
 390 union hv_x64_msr_hypercall_contents {
 391         u64 as_uint64;
 392         struct {
 393                 u64 enable:1;
 394                 u64 reserved:11;
 395                 u64 guest_physical_address:52;
 396         };
 397 };
 398
 399
 400 enum {
 401         VMBUS_MESSAGE_CONNECTION_ID     = 1,
 402         VMBUS_MESSAGE_PORT_ID           = 1,
 403         VMBUS_EVENT_CONNECTION_ID       = 2,
 404         VMBUS_EVENT_PORT_ID             = 2,
 405         VMBUS_MONITOR_CONNECTION_ID     = 3,
 406         VMBUS_MONITOR_PORT_ID           = 3,
 407         VMBUS_MESSAGE_SINT              = 2,
 408 };
 409
 410 /* #defines */
 411
 412 #define HV_PRESENT_BIT                  0x80000000
 413
 414 /*
 415  * The guest OS needs to register the guest ID with the hypervisor.
 416  * The guest ID is a 64 bit entity and the structure of this ID is
 417  * specified in the Hyper-V specification:
 418  *
 419  * http://msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
 420  *
 421  * While the current guideline does not specify how Linux guest ID(s)
 422  * need to be generated, our plan is to publish the guidelines for
 423  * Linux and other guest operating systems that currently are hosted
 424  * on Hyper-V. The implementation here conforms to this yet
 425  * unpublished guidelines.
 426  *
 427  *
 428  * Bit(s)
 429  * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
 430  * 62:56 - Os Type; Linux is 0x100
 431  * 55:48 - Distro specific identification
 432  * 47:16 - Linux kernel version number
 433  * 15:0  - Distro specific identification
 434  *
 435  *
 436  */
 437
 438 #define HV_LINUX_VENDOR_ID              0x8100
 439
 440 /*
 441  * Generate the guest ID based on the guideline described above.
 442  */
 443
 444 static inline  __u64 generate_guest_id(__u8 d_info1, __u32 kernel_version,
 445                                         __u16 d_info2)
 446 {
 447         __u64 guest_id = 0;
 448
 449         guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
 450         guest_id |= (((__u64)(d_info1)) << 48);
 451         guest_id |= (((__u64)(kernel_version)) << 16);
 452         guest_id |= ((__u64)(d_info2));
 453
 454         return guest_id;
 455 }
 456
 457
 458 #define HV_CPU_POWER_MANAGEMENT         (1 << 0)
 459 #define HV_RECOMMENDATIONS_MAX          4
 460
 461 #define HV_X64_MAX                      5
 462 #define HV_CAPS_MAX                     8
 463
 464
 465 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
 466
 467
 468 /* Service definitions */
 469
 470 #define HV_SERVICE_PARENT_PORT                          (0)
 471 #define HV_SERVICE_PARENT_CONNECTION                    (0)
 472
 473 #define HV_SERVICE_CONNECT_RESPONSE_SUCCESS             (0)
 474 #define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER   (1)
 475 #define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE     (2)
 476 #define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
 477
 478 #define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID           (1)
 479 #define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID          (2)
 480 #define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID        (3)
 481 #define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID       (4)
 482 #define HV_SERVICE_MAX_MESSAGE_ID                               (4)
 483
 484 #define HV_SERVICE_PROTOCOL_VERSION (0x0010)
 485 #define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
 486
 487 /* #define VMBUS_REVISION_NUMBER        6 */
 488
 489 /* Our local vmbus's port and connection id. Anything >0 is fine */
 490 /* #define VMBUS_PORT_ID                11 */
 491
 492 /* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
 493 static const uuid_le VMBUS_SERVICE_ID = {
 494         .b = {
 495                 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
 496                 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
 497         },
 498 };
 499
 500
 501
 502 struct hv_context {
 503         /* We only support running on top of Hyper-V
 504         * So at this point this really can only contain the Hyper-V ID
 505         */
 506         u64 guestid;
 507
 508         void *hypercall_page;
 509
 510         bool synic_initialized;
 511
 512         void *synic_message_page[NR_CPUS];
 513         void *synic_event_page[NR_CPUS];
 514         /*
 515          * Hypervisor's notion of virtual processor ID is different from
 516          * Linux' notion of CPU ID. This information can only be retrieved
 517          * in the context of the calling CPU. Setup a map for easy access
 518          * to this information:
 519          *
 520          * vp_index[a] is the Hyper-V's processor ID corresponding to
 521          * Linux cpuid 'a'.
 522          */
 523         u32 vp_index[NR_CPUS];
 524         /*
 525          * Starting with win8, we can take channel interrupts on any CPU;
 526          * we will manage the tasklet that handles events on a per CPU
 527          * basis.
 528          */
 529         struct tasklet_struct *event_dpc[NR_CPUS];
 530         /*
 531          * To optimize the mapping of relid to channel, maintain
 532          * per-cpu list of the channels based on their CPU affinity.
 533          */
 534         struct list_head percpu_list[NR_CPUS];
 535         /*
 536          * buffer to post messages to the host.
 537          */
 538         void *post_msg_page[NR_CPUS];
 539         /*
 540          * Support PV clockevent device.
 541          */
 542         struct clock_event_device *clk_evt[NR_CPUS];
 543 };
 544
 545 extern struct hv_context hv_context;
 546
 547 struct hv_ring_buffer_debug_info {
 548         u32 current_interrupt_mask;
 549         u32 current_read_index;
 550         u32 current_write_index;
 551         u32 bytes_avail_toread;
 552         u32 bytes_avail_towrite;
 553 };
 554
 555 /* Hv Interface */
 556
 557 extern int hv_init(void);
 558
 559 extern void hv_cleanup(void);
 560
 561 extern int hv_post_message(union hv_connection_id connection_id,
 562                          enum hv_message_type message_type,
 563                          void *payload, size_t payload_size);
 564
 565 extern u16 hv_signal_event(void *con_id);
 566
 567 extern int hv_synic_alloc(void);
 568
 569 extern void hv_synic_free(void);
 570
 571 extern void hv_synic_init(void *irqarg);
 572
 573 extern void hv_synic_cleanup(void *arg);
 574
 575 /*
 576  * Host version information.
 577  */
 578 extern unsigned int host_info_eax;
 579 extern unsigned int host_info_ebx;
 580 extern unsigned int host_info_ecx;
 581 extern unsigned int host_info_edx;
 582
 583 /* Interface */
 584
 585
 586 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
 587                    u32 buflen);
 588
 589 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 590
 591 int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
 592                     struct kvec *kv_list,
 593                     u32 kv_count, bool *signal);
 594
 595 int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
 596                    u32 buflen);
 597
 598 int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
 599                    void *buffer,
 600                    u32 buflen,
 601                    u32 offset, bool *signal);
 602
 603
 604 void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
 605                             struct hv_ring_buffer_debug_info *debug_info);
 606
 607 void hv_begin_read(struct hv_ring_buffer_info *rbi);
 608
 609 u32 hv_end_read(struct hv_ring_buffer_info *rbi);
 610
 611 /*
 612  * Maximum channels is determined by the size of the interrupt page
 613  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
 614  * and the other is receive endpoint interrupt
 615  */
 616 #define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
 617
 618 /* The value here must be in multiple of 32 */
 619 /* TODO: Need to make this configurable */
 620 #define MAX_NUM_CHANNELS_SUPPORTED      256
 621
 622
 623 enum vmbus_connect_state {
 624         DISCONNECTED,
 625         CONNECTING,
 626         CONNECTED,
 627         DISCONNECTING
 628 };
 629
 630 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
 631
 632 struct vmbus_connection {
 633         enum vmbus_connect_state conn_state;
 634
 635         atomic_t next_gpadl_handle;
 636
 637         /*
 638          * Represents channel interrupts. Each bit position represents a
 639          * channel.  When a channel sends an interrupt via VMBUS, it finds its
 640          * bit in the sendInterruptPage, set it and calls Hv to generate a port
 641          * event. The other end receives the port event and parse the
 642          * recvInterruptPage to see which bit is set
 643          */
 644         void *int_page;
 645         void *send_int_page;
 646         void *recv_int_page;
 647
 648         /*
 649          * 2 pages - 1st page for parent->child notification and 2nd
 650          * is child->parent notification
 651          */
 652         struct hv_monitor_page *monitor_pages[2];
 653         struct list_head chn_msg_list;
 654         spinlock_t channelmsg_lock;
 655
 656         /* List of channels */
 657         struct list_head chn_list;
 658         spinlock_t channel_lock;
 659
 660         struct workqueue_struct *work_queue;
 661 };
 662
 663
 664 struct vmbus_msginfo {
 665         /* Bookkeeping stuff */
 666         struct list_head msglist_entry;
 667
 668         /* The message itself */
 669         unsigned char msg[0];
 670 };
 671
 672
 673 extern struct vmbus_connection vmbus_connection;
 674
 675 /* General vmbus interface */
 676
 677 struct hv_device *vmbus_device_create(const uuid_le *type,
 678                                       const uuid_le *instance,
 679                                       struct vmbus_channel *channel);
 680
 681 int vmbus_device_register(struct hv_device *child_device_obj);
 682 void vmbus_device_unregister(struct hv_device *device_obj);
 683
 684 /* static void */
 685 /* VmbusChildDeviceDestroy( */
 686 /* struct hv_device *); */
 687
 688 struct vmbus_channel *relid2channel(u32 relid);
 689
 690 void vmbus_free_channels(void);
 691
 692 /* Connection interface */
 693
 694 int vmbus_connect(void);
 695
 696 int vmbus_post_msg(void *buffer, size_t buflen);
 697
 698 int vmbus_set_event(struct vmbus_channel *channel);
 699
 700 void vmbus_on_event(unsigned long data);
 701
 702 int hv_fcopy_init(struct hv_util_service *);
 703 void hv_fcopy_deinit(void);
 704 void hv_fcopy_onchannelcallback(void *);
 705
 706
 707 #endif /* _HYPERV_VMBUS_H */