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  HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE   0x400
  53
  54 #define HV_X64_MSR_CRASH_P0   0x40000100
  55 #define HV_X64_MSR_CRASH_P1   0x40000101
  56 #define HV_X64_MSR_CRASH_P2   0x40000102
  57 #define HV_X64_MSR_CRASH_P3   0x40000103
  58 #define HV_X64_MSR_CRASH_P4   0x40000104
  59 #define HV_X64_MSR_CRASH_CTL  0x40000105
  60
  61 #define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63)
  62
  63 /* Define version of the synthetic interrupt controller. */
  64 #define HV_SYNIC_VERSION                (1)
  65
  66 /* Define the expected SynIC version. */
  67 #define HV_SYNIC_VERSION_1              (0x1)
  68
  69 /* Define synthetic interrupt controller message constants. */
  70 #define HV_MESSAGE_SIZE                 (256)
  71 #define HV_MESSAGE_PAYLOAD_BYTE_COUNT   (240)
  72 #define HV_MESSAGE_PAYLOAD_QWORD_COUNT  (30)
  73 #define HV_ANY_VP                       (0xFFFFFFFF)
  74
  75 /* Define synthetic interrupt controller flag constants. */
  76 #define HV_EVENT_FLAGS_COUNT            (256 * 8)
  77 #define HV_EVENT_FLAGS_BYTE_COUNT       (256)
  78 #define HV_EVENT_FLAGS_DWORD_COUNT      (256 / sizeof(u32))
  79
  80 /* Define hypervisor message types. */
  81 enum hv_message_type {
  82         HVMSG_NONE                      = 0x00000000,
  83
  84         /* Memory access messages. */
  85         HVMSG_UNMAPPED_GPA              = 0x80000000,
  86         HVMSG_GPA_INTERCEPT             = 0x80000001,
  87
  88         /* Timer notification messages. */
  89         HVMSG_TIMER_EXPIRED                     = 0x80000010,
  90
  91         /* Error messages. */
  92         HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
  93         HVMSG_UNRECOVERABLE_EXCEPTION   = 0x80000021,
  94         HVMSG_UNSUPPORTED_FEATURE               = 0x80000022,
  95
  96         /* Trace buffer complete messages. */
  97         HVMSG_EVENTLOG_BUFFERCOMPLETE   = 0x80000040,
  98
  99         /* Platform-specific processor intercept messages. */
 100         HVMSG_X64_IOPORT_INTERCEPT              = 0x80010000,
 101         HVMSG_X64_MSR_INTERCEPT         = 0x80010001,
 102         HVMSG_X64_CPUID_INTERCEPT               = 0x80010002,
 103         HVMSG_X64_EXCEPTION_INTERCEPT   = 0x80010003,
 104         HVMSG_X64_APIC_EOI                      = 0x80010004,
 105         HVMSG_X64_LEGACY_FP_ERROR               = 0x80010005
 106 };
 107
 108 /* Define the number of synthetic interrupt sources. */
 109 #define HV_SYNIC_SINT_COUNT             (16)
 110 #define HV_SYNIC_STIMER_COUNT           (4)
 111
 112 /* Define invalid partition identifier. */
 113 #define HV_PARTITION_ID_INVALID         ((u64)0x0)
 114
 115 /* Define port identifier type. */
 116 union hv_port_id {
 117         u32 asu32;
 118         struct {
 119                 u32 id:24;
 120                 u32 reserved:8;
 121         } u ;
 122 };
 123
 124 /* Define port type. */
 125 enum hv_port_type {
 126         HVPORT_MSG      = 1,
 127         HVPORT_EVENT            = 2,
 128         HVPORT_MONITOR  = 3
 129 };
 130
 131 /* Define port information structure. */
 132 struct hv_port_info {
 133         enum hv_port_type port_type;
 134         u32 padding;
 135         union {
 136                 struct {
 137                         u32 target_sint;
 138                         u32 target_vp;
 139                         u64 rsvdz;
 140                 } message_port_info;
 141                 struct {
 142                         u32 target_sint;
 143                         u32 target_vp;
 144                         u16 base_flag_bumber;
 145                         u16 flag_count;
 146                         u32 rsvdz;
 147                 } event_port_info;
 148                 struct {
 149                         u64 monitor_address;
 150                         u64 rsvdz;
 151                 } monitor_port_info;
 152         };
 153 };
 154
 155 struct hv_connection_info {
 156         enum hv_port_type port_type;
 157         u32 padding;
 158         union {
 159                 struct {
 160                         u64 rsvdz;
 161                 } message_connection_info;
 162                 struct {
 163                         u64 rsvdz;
 164                 } event_connection_info;
 165                 struct {
 166                         u64 monitor_address;
 167                 } monitor_connection_info;
 168         };
 169 };
 170
 171 /* Define synthetic interrupt controller message flags. */
 172 union hv_message_flags {
 173         u8 asu8;
 174         struct {
 175                 u8 msg_pending:1;
 176                 u8 reserved:7;
 177         };
 178 };
 179
 180 /* Define synthetic interrupt controller message header. */
 181 struct hv_message_header {
 182         enum hv_message_type message_type;
 183         u8 payload_size;
 184         union hv_message_flags message_flags;
 185         u8 reserved[2];
 186         union {
 187                 u64 sender;
 188                 union hv_port_id port;
 189         };
 190 };
 191
 192 /*
 193  * Timer configuration register.
 194  */
 195 union hv_timer_config {
 196         u64 as_uint64;
 197         struct {
 198                 u64 enable:1;
 199                 u64 periodic:1;
 200                 u64 lazy:1;
 201                 u64 auto_enable:1;
 202                 u64 reserved_z0:12;
 203                 u64 sintx:4;
 204                 u64 reserved_z1:44;
 205         };
 206 };
 207
 208
 209 /* Define timer message payload structure. */
 210 struct hv_timer_message_payload {
 211         u32 timer_index;
 212         u32 reserved;
 213         u64 expiration_time;    /* When the timer expired */
 214         u64 delivery_time;      /* When the message was delivered */
 215 };
 216
 217 /* Define synthetic interrupt controller message format. */
 218 struct hv_message {
 219         struct hv_message_header header;
 220         union {
 221                 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 222         } u ;
 223 };
 224
 225 /* Define the number of message buffers associated with each port. */
 226 #define HV_PORT_MESSAGE_BUFFER_COUNT    (16)
 227
 228 /* Define the synthetic interrupt message page layout. */
 229 struct hv_message_page {
 230         struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
 231 };
 232
 233 /* Define the synthetic interrupt controller event flags format. */
 234 union hv_synic_event_flags {
 235         u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
 236         u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
 237 };
 238
 239 /* Define the synthetic interrupt flags page layout. */
 240 struct hv_synic_event_flags_page {
 241         union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
 242 };
 243
 244 /* Define SynIC control register. */
 245 union hv_synic_scontrol {
 246         u64 as_uint64;
 247         struct {
 248                 u64 enable:1;
 249                 u64 reserved:63;
 250         };
 251 };
 252
 253 /* Define synthetic interrupt source. */
 254 union hv_synic_sint {
 255         u64 as_uint64;
 256         struct {
 257                 u64 vector:8;
 258                 u64 reserved1:8;
 259                 u64 masked:1;
 260                 u64 auto_eoi:1;
 261                 u64 reserved2:46;
 262         };
 263 };
 264
 265 /* Define the format of the SIMP register */
 266 union hv_synic_simp {
 267         u64 as_uint64;
 268         struct {
 269                 u64 simp_enabled:1;
 270                 u64 preserved:11;
 271                 u64 base_simp_gpa:52;
 272         };
 273 };
 274
 275 /* Define the format of the SIEFP register */
 276 union hv_synic_siefp {
 277         u64 as_uint64;
 278         struct {
 279                 u64 siefp_enabled:1;
 280                 u64 preserved:11;
 281                 u64 base_siefp_gpa:52;
 282         };
 283 };
 284
 285 /* Definitions for the monitored notification facility */
 286 union hv_monitor_trigger_group {
 287         u64 as_uint64;
 288         struct {
 289                 u32 pending;
 290                 u32 armed;
 291         };
 292 };
 293
 294 struct hv_monitor_parameter {
 295         union hv_connection_id connectionid;
 296         u16 flagnumber;
 297         u16 rsvdz;
 298 };
 299
 300 union hv_monitor_trigger_state {
 301         u32 asu32;
 302
 303         struct {
 304                 u32 group_enable:4;
 305                 u32 rsvdz:28;
 306         };
 307 };
 308
 309 /* struct hv_monitor_page Layout */
 310 /* ------------------------------------------------------ */
 311 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
 312 /* | 8   | TriggerGroup[0]                              | */
 313 /* | 10  | TriggerGroup[1]                              | */
 314 /* | 18  | TriggerGroup[2]                              | */
 315 /* | 20  | TriggerGroup[3]                              | */
 316 /* | 28  | Rsvd2[0]                                     | */
 317 /* | 30  | Rsvd2[1]                                     | */
 318 /* | 38  | Rsvd2[2]                                     | */
 319 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
 320 /* | ...                                                | */
 321 /* | 240 | Latency[0][0..3]                             | */
 322 /* | 340 | Rsvz3[0]                                     | */
 323 /* | 440 | Parameter[0][0]                              | */
 324 /* | 448 | Parameter[0][1]                              | */
 325 /* | ...                                                | */
 326 /* | 840 | Rsvd4[0]                                     | */
 327 /* ------------------------------------------------------ */
 328 struct hv_monitor_page {
 329         union hv_monitor_trigger_state trigger_state;
 330         u32 rsvdz1;
 331
 332         union hv_monitor_trigger_group trigger_group[4];
 333         u64 rsvdz2[3];
 334
 335         s32 next_checktime[4][32];
 336
 337         u16 latency[4][32];
 338         u64 rsvdz3[32];
 339
 340         struct hv_monitor_parameter parameter[4][32];
 341
 342         u8 rsvdz4[1984];
 343 };
 344
 345 /* Declare the various hypercall operations. */
 346 enum hv_call_code {
 347         HVCALL_POST_MESSAGE     = 0x005c,
 348         HVCALL_SIGNAL_EVENT     = 0x005d,
 349 };
 350
 351 /* Definition of the hv_post_message hypercall input structure. */
 352 struct hv_input_post_message {
 353         union hv_connection_id connectionid;
 354         u32 reserved;
 355         enum hv_message_type message_type;
 356         u32 payload_size;
 357         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 358 };
 359
 360 /*
 361  * Versioning definitions used for guests reporting themselves to the
 362  * hypervisor, and visa versa.
 363  */
 364
 365 /* Version info reported by guest OS's */
 366 enum hv_guest_os_vendor {
 367         HVGUESTOS_VENDOR_MICROSOFT      = 0x0001
 368 };
 369
 370 enum hv_guest_os_microsoft_ids {
 371         HVGUESTOS_MICROSOFT_UNDEFINED   = 0x00,
 372         HVGUESTOS_MICROSOFT_MSDOS               = 0x01,
 373         HVGUESTOS_MICROSOFT_WINDOWS3X   = 0x02,
 374         HVGUESTOS_MICROSOFT_WINDOWS9X   = 0x03,
 375         HVGUESTOS_MICROSOFT_WINDOWSNT   = 0x04,
 376         HVGUESTOS_MICROSOFT_WINDOWSCE   = 0x05
 377 };
 378
 379 /*
 380  * Declare the MSR used to identify the guest OS.
 381  */
 382 #define HV_X64_MSR_GUEST_OS_ID  0x40000000
 383
 384 union hv_x64_msr_guest_os_id_contents {
 385         u64 as_uint64;
 386         struct {
 387                 u64 build_number:16;
 388                 u64 service_version:8; /* Service Pack, etc. */
 389                 u64 minor_version:8;
 390                 u64 major_version:8;
 391                 u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
 392                 u64 vendor_id:16; /* enum hv_guest_os_vendor */
 393         };
 394 };
 395
 396 /*
 397  * Declare the MSR used to setup pages used to communicate with the hypervisor.
 398  */
 399 #define HV_X64_MSR_HYPERCALL    0x40000001
 400
 401 union hv_x64_msr_hypercall_contents {
 402         u64 as_uint64;
 403         struct {
 404                 u64 enable:1;
 405                 u64 reserved:11;
 406                 u64 guest_physical_address:52;
 407         };
 408 };
 409
 410
 411 enum {
 412         VMBUS_MESSAGE_CONNECTION_ID     = 1,
 413         VMBUS_MESSAGE_PORT_ID           = 1,
 414         VMBUS_EVENT_CONNECTION_ID       = 2,
 415         VMBUS_EVENT_PORT_ID             = 2,
 416         VMBUS_MONITOR_CONNECTION_ID     = 3,
 417         VMBUS_MONITOR_PORT_ID           = 3,
 418         VMBUS_MESSAGE_SINT              = 2,
 419 };
 420
 421 /* #defines */
 422
 423 #define HV_PRESENT_BIT                  0x80000000
 424
 425 /*
 426  * The guest OS needs to register the guest ID with the hypervisor.
 427  * The guest ID is a 64 bit entity and the structure of this ID is
 428  * specified in the Hyper-V specification:
 429  *
 430  * http://msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
 431  *
 432  * While the current guideline does not specify how Linux guest ID(s)
 433  * need to be generated, our plan is to publish the guidelines for
 434  * Linux and other guest operating systems that currently are hosted
 435  * on Hyper-V. The implementation here conforms to this yet
 436  * unpublished guidelines.
 437  *
 438  *
 439  * Bit(s)
 440  * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
 441  * 62:56 - Os Type; Linux is 0x100
 442  * 55:48 - Distro specific identification
 443  * 47:16 - Linux kernel version number
 444  * 15:0  - Distro specific identification
 445  *
 446  *
 447  */
 448
 449 #define HV_LINUX_VENDOR_ID              0x8100
 450
 451 /*
 452  * Generate the guest ID based on the guideline described above.
 453  */
 454
 455 static inline  __u64 generate_guest_id(__u8 d_info1, __u32 kernel_version,
 456                                         __u16 d_info2)
 457 {
 458         __u64 guest_id = 0;
 459
 460         guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
 461         guest_id |= (((__u64)(d_info1)) << 48);
 462         guest_id |= (((__u64)(kernel_version)) << 16);
 463         guest_id |= ((__u64)(d_info2));
 464
 465         return guest_id;
 466 }
 467
 468
 469 #define HV_CPU_POWER_MANAGEMENT         (1 << 0)
 470 #define HV_RECOMMENDATIONS_MAX          4
 471
 472 #define HV_X64_MAX                      5
 473 #define HV_CAPS_MAX                     8
 474
 475
 476 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
 477
 478
 479 /* Service definitions */
 480
 481 #define HV_SERVICE_PARENT_PORT                          (0)
 482 #define HV_SERVICE_PARENT_CONNECTION                    (0)
 483
 484 #define HV_SERVICE_CONNECT_RESPONSE_SUCCESS             (0)
 485 #define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER   (1)
 486 #define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE     (2)
 487 #define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
 488
 489 #define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID           (1)
 490 #define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID          (2)
 491 #define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID        (3)
 492 #define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID       (4)
 493 #define HV_SERVICE_MAX_MESSAGE_ID                               (4)
 494
 495 #define HV_SERVICE_PROTOCOL_VERSION (0x0010)
 496 #define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
 497
 498 /* #define VMBUS_REVISION_NUMBER        6 */
 499
 500 /* Our local vmbus's port and connection id. Anything >0 is fine */
 501 /* #define VMBUS_PORT_ID                11 */
 502
 503 /* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
 504 static const uuid_le VMBUS_SERVICE_ID = {
 505         .b = {
 506                 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
 507                 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
 508         },
 509 };
 510
 511
 512
 513 struct hv_context {
 514         /* We only support running on top of Hyper-V
 515         * So at this point this really can only contain the Hyper-V ID
 516         */
 517         u64 guestid;
 518
 519         void *hypercall_page;
 520
 521         bool synic_initialized;
 522
 523         void *synic_message_page[NR_CPUS];
 524         void *synic_event_page[NR_CPUS];
 525         /*
 526          * Hypervisor's notion of virtual processor ID is different from
 527          * Linux' notion of CPU ID. This information can only be retrieved
 528          * in the context of the calling CPU. Setup a map for easy access
 529          * to this information:
 530          *
 531          * vp_index[a] is the Hyper-V's processor ID corresponding to
 532          * Linux cpuid 'a'.
 533          */
 534         u32 vp_index[NR_CPUS];
 535         /*
 536          * Starting with win8, we can take channel interrupts on any CPU;
 537          * we will manage the tasklet that handles events on a per CPU
 538          * basis.
 539          */
 540         struct tasklet_struct *event_dpc[NR_CPUS];
 541         /*
 542          * To optimize the mapping of relid to channel, maintain
 543          * per-cpu list of the channels based on their CPU affinity.
 544          */
 545         struct list_head percpu_list[NR_CPUS];
 546         /*
 547          * buffer to post messages to the host.
 548          */
 549         void *post_msg_page[NR_CPUS];
 550         /*
 551          * Support PV clockevent device.
 552          */
 553         struct clock_event_device *clk_evt[NR_CPUS];
 554 };
 555
 556 extern struct hv_context hv_context;
 557
 558 struct hv_ring_buffer_debug_info {
 559         u32 current_interrupt_mask;
 560         u32 current_read_index;
 561         u32 current_write_index;
 562         u32 bytes_avail_toread;
 563         u32 bytes_avail_towrite;
 564 };
 565
 566 /* Hv Interface */
 567
 568 extern int hv_init(void);
 569
 570 extern void hv_cleanup(void);
 571
 572 extern int hv_post_message(union hv_connection_id connection_id,
 573                          enum hv_message_type message_type,
 574                          void *payload, size_t payload_size);
 575
 576 extern u16 hv_signal_event(void *con_id);
 577
 578 extern int hv_synic_alloc(void);
 579
 580 extern void hv_synic_free(void);
 581
 582 extern void hv_synic_init(void *irqarg);
 583
 584 extern void hv_synic_cleanup(void *arg);
 585
 586 extern void hv_synic_clockevents_cleanup(void);
 587
 588 /*
 589  * Host version information.
 590  */
 591 extern unsigned int host_info_eax;
 592 extern unsigned int host_info_ebx;
 593 extern unsigned int host_info_ecx;
 594 extern unsigned int host_info_edx;
 595
 596 /* Interface */
 597
 598
 599 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
 600                    u32 buflen);
 601
 602 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 603
 604 int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
 605                     struct kvec *kv_list,
 606                     u32 kv_count, bool *signal);
 607
 608 int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
 609                    u32 buflen);
 610
 611 int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
 612                    void *buffer,
 613                    u32 buflen,
 614                    u32 offset, bool *signal);
 615
 616
 617 void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
 618                             struct hv_ring_buffer_debug_info *debug_info);
 619
 620 void hv_begin_read(struct hv_ring_buffer_info *rbi);
 621
 622 u32 hv_end_read(struct hv_ring_buffer_info *rbi);
 623
 624 /*
 625  * Maximum channels is determined by the size of the interrupt page
 626  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
 627  * and the other is receive endpoint interrupt
 628  */
 629 #define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
 630
 631 /* The value here must be in multiple of 32 */
 632 /* TODO: Need to make this configurable */
 633 #define MAX_NUM_CHANNELS_SUPPORTED      256
 634
 635
 636 enum vmbus_connect_state {
 637         DISCONNECTED,
 638         CONNECTING,
 639         CONNECTED,
 640         DISCONNECTING
 641 };
 642
 643 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
 644
 645 struct vmbus_connection {
 646         enum vmbus_connect_state conn_state;
 647
 648         atomic_t next_gpadl_handle;
 649
 650         /*
 651          * Represents channel interrupts. Each bit position represents a
 652          * channel.  When a channel sends an interrupt via VMBUS, it finds its
 653          * bit in the sendInterruptPage, set it and calls Hv to generate a port
 654          * event. The other end receives the port event and parse the
 655          * recvInterruptPage to see which bit is set
 656          */
 657         void *int_page;
 658         void *send_int_page;
 659         void *recv_int_page;
 660
 661         /*
 662          * 2 pages - 1st page for parent->child notification and 2nd
 663          * is child->parent notification
 664          */
 665         struct hv_monitor_page *monitor_pages[2];
 666         struct list_head chn_msg_list;
 667         spinlock_t channelmsg_lock;
 668
 669         /* List of channels */
 670         struct list_head chn_list;
 671         spinlock_t channel_lock;
 672
 673         struct workqueue_struct *work_queue;
 674 };
 675
 676
 677 struct vmbus_msginfo {
 678         /* Bookkeeping stuff */
 679         struct list_head msglist_entry;
 680
 681         /* The message itself */
 682         unsigned char msg[0];
 683 };
 684
 685
 686 extern struct vmbus_connection vmbus_connection;
 687
 688 enum vmbus_message_handler_type {
 689         /* The related handler can sleep. */
 690         VMHT_BLOCKING = 0,
 691
 692         /* The related handler must NOT sleep. */
 693         VMHT_NON_BLOCKING = 1,
 694 };
 695
 696 struct vmbus_channel_message_table_entry {
 697         enum vmbus_channel_message_type message_type;
 698         enum vmbus_message_handler_type handler_type;
 699         void (*message_handler)(struct vmbus_channel_message_header *msg);
 700 };
 701
 702 extern struct vmbus_channel_message_table_entry
 703         channel_message_table[CHANNELMSG_COUNT];
 704
 705 /* General vmbus interface */
 706
 707 struct hv_device *vmbus_device_create(const uuid_le *type,
 708                                       const uuid_le *instance,
 709                                       struct vmbus_channel *channel);
 710
 711 int vmbus_device_register(struct hv_device *child_device_obj);
 712 void vmbus_device_unregister(struct hv_device *device_obj);
 713
 714 /* static void */
 715 /* VmbusChildDeviceDestroy( */
 716 /* struct hv_device *); */
 717
 718 struct vmbus_channel *relid2channel(u32 relid);
 719
 720 void vmbus_free_channels(void);
 721
 722 /* Connection interface */
 723
 724 int vmbus_connect(void);
 725 void vmbus_disconnect(void);
 726
 727 int vmbus_post_msg(void *buffer, size_t buflen);
 728
 729 int vmbus_set_event(struct vmbus_channel *channel);
 730
 731 void vmbus_on_event(unsigned long data);
 732
 733 int hv_kvp_init(struct hv_util_service *);
 734 void hv_kvp_deinit(void);
 735 void hv_kvp_onchannelcallback(void *);
 736
 737 int hv_vss_init(struct hv_util_service *);
 738 void hv_vss_deinit(void);
 739 void hv_vss_onchannelcallback(void *);
 740
 741 int hv_fcopy_init(struct hv_util_service *);
 742 void hv_fcopy_deinit(void);
 743 void hv_fcopy_onchannelcallback(void *);
 744
 745 static inline void hv_poll_channel(struct vmbus_channel *channel,
 746                                    void (*cb)(void *))
 747 {
 748         if (!channel)
 749                 return;
 750
 751         if (channel->target_cpu != smp_processor_id())
 752                 smp_call_function_single(channel->target_cpu,
 753                                          cb, channel, true);
 754         else
 755                 cb(channel);
 756 }
 757
 758 #endif /* _HYPERV_VMBUS_H */