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 synthetic interrupt controller message constants. */
  67 #define HV_MESSAGE_SIZE                 (256)
  68 #define HV_MESSAGE_PAYLOAD_BYTE_COUNT   (240)
  69 #define HV_MESSAGE_PAYLOAD_QWORD_COUNT  (30)
  70 #define HV_ANY_VP                       (0xFFFFFFFF)
  71
  72 /* Define synthetic interrupt controller flag constants. */
  73 #define HV_EVENT_FLAGS_COUNT            (256 * 8)
  74 #define HV_EVENT_FLAGS_BYTE_COUNT       (256)
  75 #define HV_EVENT_FLAGS_DWORD_COUNT      (256 / sizeof(u32))
  76
  77 /* Define hypervisor message types. */
  78 enum hv_message_type {
  79         HVMSG_NONE                      = 0x00000000,
  80
  81         /* Memory access messages. */
  82         HVMSG_UNMAPPED_GPA              = 0x80000000,
  83         HVMSG_GPA_INTERCEPT             = 0x80000001,
  84
  85         /* Timer notification messages. */
  86         HVMSG_TIMER_EXPIRED                     = 0x80000010,
  87
  88         /* Error messages. */
  89         HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
  90         HVMSG_UNRECOVERABLE_EXCEPTION   = 0x80000021,
  91         HVMSG_UNSUPPORTED_FEATURE               = 0x80000022,
  92
  93         /* Trace buffer complete messages. */
  94         HVMSG_EVENTLOG_BUFFERCOMPLETE   = 0x80000040,
  95
  96         /* Platform-specific processor intercept messages. */
  97         HVMSG_X64_IOPORT_INTERCEPT              = 0x80010000,
  98         HVMSG_X64_MSR_INTERCEPT         = 0x80010001,
  99         HVMSG_X64_CPUID_INTERCEPT               = 0x80010002,
 100         HVMSG_X64_EXCEPTION_INTERCEPT   = 0x80010003,
 101         HVMSG_X64_APIC_EOI                      = 0x80010004,
 102         HVMSG_X64_LEGACY_FP_ERROR               = 0x80010005
 103 };
 104
 105 #define HV_SYNIC_STIMER_COUNT           (4)
 106
 107 /* Define invalid partition identifier. */
 108 #define HV_PARTITION_ID_INVALID         ((u64)0x0)
 109
 110 /* Define port identifier type. */
 111 union hv_port_id {
 112         u32 asu32;
 113         struct {
 114                 u32 id:24;
 115                 u32 reserved:8;
 116         } u ;
 117 };
 118
 119 /* Define port type. */
 120 enum hv_port_type {
 121         HVPORT_MSG      = 1,
 122         HVPORT_EVENT            = 2,
 123         HVPORT_MONITOR  = 3
 124 };
 125
 126 /* Define port information structure. */
 127 struct hv_port_info {
 128         enum hv_port_type port_type;
 129         u32 padding;
 130         union {
 131                 struct {
 132                         u32 target_sint;
 133                         u32 target_vp;
 134                         u64 rsvdz;
 135                 } message_port_info;
 136                 struct {
 137                         u32 target_sint;
 138                         u32 target_vp;
 139                         u16 base_flag_number;
 140                         u16 flag_count;
 141                         u32 rsvdz;
 142                 } event_port_info;
 143                 struct {
 144                         u64 monitor_address;
 145                         u64 rsvdz;
 146                 } monitor_port_info;
 147         };
 148 };
 149
 150 struct hv_connection_info {
 151         enum hv_port_type port_type;
 152         u32 padding;
 153         union {
 154                 struct {
 155                         u64 rsvdz;
 156                 } message_connection_info;
 157                 struct {
 158                         u64 rsvdz;
 159                 } event_connection_info;
 160                 struct {
 161                         u64 monitor_address;
 162                 } monitor_connection_info;
 163         };
 164 };
 165
 166 /* Define synthetic interrupt controller message flags. */
 167 union hv_message_flags {
 168         u8 asu8;
 169         struct {
 170                 u8 msg_pending:1;
 171                 u8 reserved:7;
 172         };
 173 };
 174
 175 /* Define synthetic interrupt controller message header. */
 176 struct hv_message_header {
 177         enum hv_message_type message_type;
 178         u8 payload_size;
 179         union hv_message_flags message_flags;
 180         u8 reserved[2];
 181         union {
 182                 u64 sender;
 183                 union hv_port_id port;
 184         };
 185 };
 186
 187 /*
 188  * Timer configuration register.
 189  */
 190 union hv_timer_config {
 191         u64 as_uint64;
 192         struct {
 193                 u64 enable:1;
 194                 u64 periodic:1;
 195                 u64 lazy:1;
 196                 u64 auto_enable:1;
 197                 u64 reserved_z0:12;
 198                 u64 sintx:4;
 199                 u64 reserved_z1:44;
 200         };
 201 };
 202
 203
 204 /* Define timer message payload structure. */
 205 struct hv_timer_message_payload {
 206         u32 timer_index;
 207         u32 reserved;
 208         u64 expiration_time;    /* When the timer expired */
 209         u64 delivery_time;      /* When the message was delivered */
 210 };
 211
 212 /* Define synthetic interrupt controller message format. */
 213 struct hv_message {
 214         struct hv_message_header header;
 215         union {
 216                 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 217         } u ;
 218 };
 219
 220 /* Define the number of message buffers associated with each port. */
 221 #define HV_PORT_MESSAGE_BUFFER_COUNT    (16)
 222
 223 /* Define the synthetic interrupt message page layout. */
 224 struct hv_message_page {
 225         struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
 226 };
 227
 228 /* Define the synthetic interrupt controller event flags format. */
 229 union hv_synic_event_flags {
 230         u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
 231         u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
 232 };
 233
 234 /* Define the synthetic interrupt flags page layout. */
 235 struct hv_synic_event_flags_page {
 236         union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
 237 };
 238
 239 /* Define SynIC control register. */
 240 union hv_synic_scontrol {
 241         u64 as_uint64;
 242         struct {
 243                 u64 enable:1;
 244                 u64 reserved:63;
 245         };
 246 };
 247
 248 /* Define synthetic interrupt source. */
 249 union hv_synic_sint {
 250         u64 as_uint64;
 251         struct {
 252                 u64 vector:8;
 253                 u64 reserved1:8;
 254                 u64 masked:1;
 255                 u64 auto_eoi:1;
 256                 u64 reserved2:46;
 257         };
 258 };
 259
 260 /* Define the format of the SIMP register */
 261 union hv_synic_simp {
 262         u64 as_uint64;
 263         struct {
 264                 u64 simp_enabled:1;
 265                 u64 preserved:11;
 266                 u64 base_simp_gpa:52;
 267         };
 268 };
 269
 270 /* Define the format of the SIEFP register */
 271 union hv_synic_siefp {
 272         u64 as_uint64;
 273         struct {
 274                 u64 siefp_enabled:1;
 275                 u64 preserved:11;
 276                 u64 base_siefp_gpa:52;
 277         };
 278 };
 279
 280 /* Definitions for the monitored notification facility */
 281 union hv_monitor_trigger_group {
 282         u64 as_uint64;
 283         struct {
 284                 u32 pending;
 285                 u32 armed;
 286         };
 287 };
 288
 289 struct hv_monitor_parameter {
 290         union hv_connection_id connectionid;
 291         u16 flagnumber;
 292         u16 rsvdz;
 293 };
 294
 295 union hv_monitor_trigger_state {
 296         u32 asu32;
 297
 298         struct {
 299                 u32 group_enable:4;
 300                 u32 rsvdz:28;
 301         };
 302 };
 303
 304 /* struct hv_monitor_page Layout */
 305 /* ------------------------------------------------------ */
 306 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
 307 /* | 8   | TriggerGroup[0]                              | */
 308 /* | 10  | TriggerGroup[1]                              | */
 309 /* | 18  | TriggerGroup[2]                              | */
 310 /* | 20  | TriggerGroup[3]                              | */
 311 /* | 28  | Rsvd2[0]                                     | */
 312 /* | 30  | Rsvd2[1]                                     | */
 313 /* | 38  | Rsvd2[2]                                     | */
 314 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
 315 /* | ...                                                | */
 316 /* | 240 | Latency[0][0..3]                             | */
 317 /* | 340 | Rsvz3[0]                                     | */
 318 /* | 440 | Parameter[0][0]                              | */
 319 /* | 448 | Parameter[0][1]                              | */
 320 /* | ...                                                | */
 321 /* | 840 | Rsvd4[0]                                     | */
 322 /* ------------------------------------------------------ */
 323 struct hv_monitor_page {
 324         union hv_monitor_trigger_state trigger_state;
 325         u32 rsvdz1;
 326
 327         union hv_monitor_trigger_group trigger_group[4];
 328         u64 rsvdz2[3];
 329
 330         s32 next_checktime[4][32];
 331
 332         u16 latency[4][32];
 333         u64 rsvdz3[32];
 334
 335         struct hv_monitor_parameter parameter[4][32];
 336
 337         u8 rsvdz4[1984];
 338 };
 339
 340 /* Declare the various hypercall operations. */
 341 enum hv_call_code {
 342         HVCALL_POST_MESSAGE     = 0x005c,
 343         HVCALL_SIGNAL_EVENT     = 0x005d,
 344 };
 345
 346 /* Definition of the hv_post_message hypercall input structure. */
 347 struct hv_input_post_message {
 348         union hv_connection_id connectionid;
 349         u32 reserved;
 350         enum hv_message_type message_type;
 351         u32 payload_size;
 352         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 353 };
 354
 355 /*
 356  * Versioning definitions used for guests reporting themselves to the
 357  * hypervisor, and visa versa.
 358  */
 359
 360 /* Version info reported by guest OS's */
 361 enum hv_guest_os_vendor {
 362         HVGUESTOS_VENDOR_MICROSOFT      = 0x0001
 363 };
 364
 365 enum hv_guest_os_microsoft_ids {
 366         HVGUESTOS_MICROSOFT_UNDEFINED   = 0x00,
 367         HVGUESTOS_MICROSOFT_MSDOS               = 0x01,
 368         HVGUESTOS_MICROSOFT_WINDOWS3X   = 0x02,
 369         HVGUESTOS_MICROSOFT_WINDOWS9X   = 0x03,
 370         HVGUESTOS_MICROSOFT_WINDOWSNT   = 0x04,
 371         HVGUESTOS_MICROSOFT_WINDOWSCE   = 0x05
 372 };
 373
 374 /*
 375  * Declare the MSR used to identify the guest OS.
 376  */
 377 #define HV_X64_MSR_GUEST_OS_ID  0x40000000
 378
 379 union hv_x64_msr_guest_os_id_contents {
 380         u64 as_uint64;
 381         struct {
 382                 u64 build_number:16;
 383                 u64 service_version:8; /* Service Pack, etc. */
 384                 u64 minor_version:8;
 385                 u64 major_version:8;
 386                 u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
 387                 u64 vendor_id:16; /* enum hv_guest_os_vendor */
 388         };
 389 };
 390
 391 /*
 392  * Declare the MSR used to setup pages used to communicate with the hypervisor.
 393  */
 394 #define HV_X64_MSR_HYPERCALL    0x40000001
 395
 396 union hv_x64_msr_hypercall_contents {
 397         u64 as_uint64;
 398         struct {
 399                 u64 enable:1;
 400                 u64 reserved:11;
 401                 u64 guest_physical_address:52;
 402         };
 403 };
 404
 405
 406 enum {
 407         VMBUS_MESSAGE_CONNECTION_ID     = 1,
 408         VMBUS_MESSAGE_PORT_ID           = 1,
 409         VMBUS_EVENT_CONNECTION_ID       = 2,
 410         VMBUS_EVENT_PORT_ID             = 2,
 411         VMBUS_MONITOR_CONNECTION_ID     = 3,
 412         VMBUS_MONITOR_PORT_ID           = 3,
 413         VMBUS_MESSAGE_SINT              = 2,
 414 };
 415
 416 /* #defines */
 417
 418 #define HV_PRESENT_BIT                  0x80000000
 419
 420 /*
 421  * The guest OS needs to register the guest ID with the hypervisor.
 422  * The guest ID is a 64 bit entity and the structure of this ID is
 423  * specified in the Hyper-V specification:
 424  *
 425  * http://msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
 426  *
 427  * While the current guideline does not specify how Linux guest ID(s)
 428  * need to be generated, our plan is to publish the guidelines for
 429  * Linux and other guest operating systems that currently are hosted
 430  * on Hyper-V. The implementation here conforms to this yet
 431  * unpublished guidelines.
 432  *
 433  *
 434  * Bit(s)
 435  * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
 436  * 62:56 - Os Type; Linux is 0x100
 437  * 55:48 - Distro specific identification
 438  * 47:16 - Linux kernel version number
 439  * 15:0  - Distro specific identification
 440  *
 441  *
 442  */
 443
 444 #define HV_LINUX_VENDOR_ID              0x8100
 445
 446 /*
 447  * Generate the guest ID based on the guideline described above.
 448  */
 449
 450 static inline  __u64 generate_guest_id(__u8 d_info1, __u32 kernel_version,
 451                                         __u16 d_info2)
 452 {
 453         __u64 guest_id = 0;
 454
 455         guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
 456         guest_id |= (((__u64)(d_info1)) << 48);
 457         guest_id |= (((__u64)(kernel_version)) << 16);
 458         guest_id |= ((__u64)(d_info2));
 459
 460         return guest_id;
 461 }
 462
 463
 464 #define HV_CPU_POWER_MANAGEMENT         (1 << 0)
 465 #define HV_RECOMMENDATIONS_MAX          4
 466
 467 #define HV_X64_MAX                      5
 468 #define HV_CAPS_MAX                     8
 469
 470
 471 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
 472
 473
 474 /* Service definitions */
 475
 476 #define HV_SERVICE_PARENT_PORT                          (0)
 477 #define HV_SERVICE_PARENT_CONNECTION                    (0)
 478
 479 #define HV_SERVICE_CONNECT_RESPONSE_SUCCESS             (0)
 480 #define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER   (1)
 481 #define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE     (2)
 482 #define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
 483
 484 #define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID           (1)
 485 #define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID          (2)
 486 #define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID        (3)
 487 #define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID       (4)
 488 #define HV_SERVICE_MAX_MESSAGE_ID                               (4)
 489
 490 #define HV_SERVICE_PROTOCOL_VERSION (0x0010)
 491 #define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
 492
 493 /* #define VMBUS_REVISION_NUMBER        6 */
 494
 495 /* Our local vmbus's port and connection id. Anything >0 is fine */
 496 /* #define VMBUS_PORT_ID                11 */
 497
 498 /* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
 499 static const uuid_le VMBUS_SERVICE_ID = {
 500         .b = {
 501                 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
 502                 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
 503         },
 504 };
 505
 506
 507
 508 struct hv_context {
 509         /* We only support running on top of Hyper-V
 510         * So at this point this really can only contain the Hyper-V ID
 511         */
 512         u64 guestid;
 513
 514         void *hypercall_page;
 515         void *tsc_page;
 516
 517         bool synic_initialized;
 518
 519         void *synic_message_page[NR_CPUS];
 520         void *synic_event_page[NR_CPUS];
 521         /*
 522          * Hypervisor's notion of virtual processor ID is different from
 523          * Linux' notion of CPU ID. This information can only be retrieved
 524          * in the context of the calling CPU. Setup a map for easy access
 525          * to this information:
 526          *
 527          * vp_index[a] is the Hyper-V's processor ID corresponding to
 528          * Linux cpuid 'a'.
 529          */
 530         u32 vp_index[NR_CPUS];
 531         /*
 532          * Starting with win8, we can take channel interrupts on any CPU;
 533          * we will manage the tasklet that handles events on a per CPU
 534          * basis.
 535          */
 536         struct tasklet_struct *event_dpc[NR_CPUS];
 537         /*
 538          * To optimize the mapping of relid to channel, maintain
 539          * per-cpu list of the channels based on their CPU affinity.
 540          */
 541         struct list_head percpu_list[NR_CPUS];
 542         /*
 543          * buffer to post messages to the host.
 544          */
 545         void *post_msg_page[NR_CPUS];
 546         /*
 547          * Support PV clockevent device.
 548          */
 549         struct clock_event_device *clk_evt[NR_CPUS];
 550         /*
 551          * To manage allocations in a NUMA node.
 552          * Array indexed by numa node ID.
 553          */
 554         struct cpumask *hv_numa_map;
 555 };
 556
 557 extern struct hv_context hv_context;
 558
 559 struct ms_hyperv_tsc_page {
 560         volatile u32 tsc_sequence;
 561         u32 reserved1;
 562         volatile u64 tsc_scale;
 563         volatile s64 tsc_offset;
 564         u64 reserved2[509];
 565 };
 566
 567 struct hv_ring_buffer_debug_info {
 568         u32 current_interrupt_mask;
 569         u32 current_read_index;
 570         u32 current_write_index;
 571         u32 bytes_avail_toread;
 572         u32 bytes_avail_towrite;
 573 };
 574
 575 /* Hv Interface */
 576
 577 extern int hv_init(void);
 578
 579 extern void hv_cleanup(void);
 580
 581 extern int hv_post_message(union hv_connection_id connection_id,
 582                          enum hv_message_type message_type,
 583                          void *payload, size_t payload_size);
 584
 585 extern u16 hv_signal_event(void *con_id);
 586
 587 extern int hv_synic_alloc(void);
 588
 589 extern void hv_synic_free(void);
 590
 591 extern void hv_synic_init(void *irqarg);
 592
 593 extern void hv_synic_cleanup(void *arg);
 594
 595 extern void hv_synic_clockevents_cleanup(void);
 596
 597 /*
 598  * Host version information.
 599  */
 600 extern unsigned int host_info_eax;
 601 extern unsigned int host_info_ebx;
 602 extern unsigned int host_info_ecx;
 603 extern unsigned int host_info_edx;
 604
 605 /* Interface */
 606
 607
 608 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
 609                    u32 buflen);
 610
 611 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 612
 613 int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
 614                     struct kvec *kv_list,
 615                     u32 kv_count, bool *signal);
 616
 617 int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
 618                    u32 buflen);
 619
 620 int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
 621                    void *buffer,
 622                    u32 buflen,
 623                    u32 offset, bool *signal);
 624
 625
 626 void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
 627                             struct hv_ring_buffer_debug_info *debug_info);
 628
 629 void hv_begin_read(struct hv_ring_buffer_info *rbi);
 630
 631 u32 hv_end_read(struct hv_ring_buffer_info *rbi);
 632
 633 /*
 634  * Maximum channels is determined by the size of the interrupt page
 635  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
 636  * and the other is receive endpoint interrupt
 637  */
 638 #define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
 639
 640 /* The value here must be in multiple of 32 */
 641 /* TODO: Need to make this configurable */
 642 #define MAX_NUM_CHANNELS_SUPPORTED      256
 643
 644
 645 enum vmbus_connect_state {
 646         DISCONNECTED,
 647         CONNECTING,
 648         CONNECTED,
 649         DISCONNECTING
 650 };
 651
 652 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
 653
 654 struct vmbus_connection {
 655         enum vmbus_connect_state conn_state;
 656
 657         atomic_t next_gpadl_handle;
 658
 659         struct completion  unload_event;
 660         /*
 661          * Represents channel interrupts. Each bit position represents a
 662          * channel.  When a channel sends an interrupt via VMBUS, it finds its
 663          * bit in the sendInterruptPage, set it and calls Hv to generate a port
 664          * event. The other end receives the port event and parse the
 665          * recvInterruptPage to see which bit is set
 666          */
 667         void *int_page;
 668         void *send_int_page;
 669         void *recv_int_page;
 670
 671         /*
 672          * 2 pages - 1st page for parent->child notification and 2nd
 673          * is child->parent notification
 674          */
 675         struct hv_monitor_page *monitor_pages[2];
 676         struct list_head chn_msg_list;
 677         spinlock_t channelmsg_lock;
 678
 679         /* List of channels */
 680         struct list_head chn_list;
 681         spinlock_t channel_lock;
 682
 683         struct workqueue_struct *work_queue;
 684 };
 685
 686
 687 struct vmbus_msginfo {
 688         /* Bookkeeping stuff */
 689         struct list_head msglist_entry;
 690
 691         /* The message itself */
 692         unsigned char msg[0];
 693 };
 694
 695
 696 extern struct vmbus_connection vmbus_connection;
 697
 698 enum vmbus_message_handler_type {
 699         /* The related handler can sleep. */
 700         VMHT_BLOCKING = 0,
 701
 702         /* The related handler must NOT sleep. */
 703         VMHT_NON_BLOCKING = 1,
 704 };
 705
 706 struct vmbus_channel_message_table_entry {
 707         enum vmbus_channel_message_type message_type;
 708         enum vmbus_message_handler_type handler_type;
 709         void (*message_handler)(struct vmbus_channel_message_header *msg);
 710 };
 711
 712 extern struct vmbus_channel_message_table_entry
 713         channel_message_table[CHANNELMSG_COUNT];
 714
 715 /* General vmbus interface */
 716
 717 struct hv_device *vmbus_device_create(const uuid_le *type,
 718                                       const uuid_le *instance,
 719                                       struct vmbus_channel *channel);
 720
 721 int vmbus_device_register(struct hv_device *child_device_obj);
 722 void vmbus_device_unregister(struct hv_device *device_obj);
 723
 724 /* static void */
 725 /* VmbusChildDeviceDestroy( */
 726 /* struct hv_device *); */
 727
 728 struct vmbus_channel *relid2channel(u32 relid);
 729
 730 void vmbus_free_channels(void);
 731
 732 /* Connection interface */
 733
 734 int vmbus_connect(void);
 735 void vmbus_disconnect(void);
 736
 737 int vmbus_post_msg(void *buffer, size_t buflen);
 738
 739 int vmbus_set_event(struct vmbus_channel *channel);
 740
 741 void vmbus_on_event(unsigned long data);
 742
 743 int hv_kvp_init(struct hv_util_service *);
 744 void hv_kvp_deinit(void);
 745 void hv_kvp_onchannelcallback(void *);
 746
 747 int hv_vss_init(struct hv_util_service *);
 748 void hv_vss_deinit(void);
 749 void hv_vss_onchannelcallback(void *);
 750
 751 int hv_fcopy_init(struct hv_util_service *);
 752 void hv_fcopy_deinit(void);
 753 void hv_fcopy_onchannelcallback(void *);
 754 void vmbus_initiate_unload(void);
 755
 756 static inline void hv_poll_channel(struct vmbus_channel *channel,
 757                                    void (*cb)(void *))
 758 {
 759         if (!channel)
 760                 return;
 761
 762         if (channel->target_cpu != smp_processor_id())
 763                 smp_call_function_single(channel->target_cpu,
 764                                          cb, channel, true);
 765         else
 766                 cb(channel);
 767 }
 768
 769 enum hvutil_device_state {
 770         HVUTIL_DEVICE_INIT = 0,  /* driver is loaded, waiting for userspace */
 771         HVUTIL_READY,            /* userspace is registered */
 772         HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
 773         HVUTIL_USERSPACE_REQ,    /* request to userspace was sent */
 774         HVUTIL_USERSPACE_RECV,   /* reply from userspace was received */
 775         HVUTIL_DEVICE_DYING,     /* driver unload is in progress */
 776 };
 777
 778 #endif /* _HYPERV_VMBUS_H */