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 connection identifier type. */
 105 union hv_connection_id {
 106         u32 asu32;
 107         struct {
 108                 u32 id:24;
 109                 u32 reserved:8;
 110         } u;
 111 };
 112
 113 /* Define port identifier type. */
 114 union hv_port_id {
 115         u32 asu32;
 116         struct {
 117                 u32 id:24;
 118                 u32 reserved:8;
 119         } u ;
 120 };
 121
 122 /* Define port type. */
 123 enum hv_port_type {
 124         HVPORT_MSG      = 1,
 125         HVPORT_EVENT            = 2,
 126         HVPORT_MONITOR  = 3
 127 };
 128
 129 /* Define port information structure. */
 130 struct hv_port_info {
 131         enum hv_port_type port_type;
 132         u32 padding;
 133         union {
 134                 struct {
 135                         u32 target_sint;
 136                         u32 target_vp;
 137                         u64 rsvdz;
 138                 } message_port_info;
 139                 struct {
 140                         u32 target_sint;
 141                         u32 target_vp;
 142                         u16 base_flag_bumber;
 143                         u16 flag_count;
 144                         u32 rsvdz;
 145                 } event_port_info;
 146                 struct {
 147                         u64 monitor_address;
 148                         u64 rsvdz;
 149                 } monitor_port_info;
 150         };
 151 };
 152
 153 struct hv_connection_info {
 154         enum hv_port_type port_type;
 155         u32 padding;
 156         union {
 157                 struct {
 158                         u64 rsvdz;
 159                 } message_connection_info;
 160                 struct {
 161                         u64 rsvdz;
 162                 } event_connection_info;
 163                 struct {
 164                         u64 monitor_address;
 165                 } monitor_connection_info;
 166         };
 167 };
 168
 169 /* Define synthetic interrupt controller message flags. */
 170 union hv_message_flags {
 171         u8 asu8;
 172         struct {
 173                 u8 msg_pending:1;
 174                 u8 reserved:7;
 175         };
 176 };
 177
 178 /* Define synthetic interrupt controller message header. */
 179 struct hv_message_header {
 180         enum hv_message_type message_type;
 181         u8 payload_size;
 182         union hv_message_flags message_flags;
 183         u8 reserved[2];
 184         union {
 185                 u64 sender;
 186                 union hv_port_id port;
 187         };
 188 };
 189
 190 /* Define timer message payload structure. */
 191 struct hv_timer_message_payload {
 192         u32 timer_index;
 193         u32 reserved;
 194         u64 expiration_time;    /* When the timer expired */
 195         u64 delivery_time;      /* When the message was delivered */
 196 };
 197
 198 /* Define synthetic interrupt controller message format. */
 199 struct hv_message {
 200         struct hv_message_header header;
 201         union {
 202                 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 203         } u ;
 204 };
 205
 206 /* Define the number of message buffers associated with each port. */
 207 #define HV_PORT_MESSAGE_BUFFER_COUNT    (16)
 208
 209 /* Define the synthetic interrupt message page layout. */
 210 struct hv_message_page {
 211         struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
 212 };
 213
 214 /* Define the synthetic interrupt controller event flags format. */
 215 union hv_synic_event_flags {
 216         u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
 217         u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
 218 };
 219
 220 /* Define the synthetic interrupt flags page layout. */
 221 struct hv_synic_event_flags_page {
 222         union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
 223 };
 224
 225 /* Define SynIC control register. */
 226 union hv_synic_scontrol {
 227         u64 as_uint64;
 228         struct {
 229                 u64 enable:1;
 230                 u64 reserved:63;
 231         };
 232 };
 233
 234 /* Define synthetic interrupt source. */
 235 union hv_synic_sint {
 236         u64 as_uint64;
 237         struct {
 238                 u64 vector:8;
 239                 u64 reserved1:8;
 240                 u64 masked:1;
 241                 u64 auto_eoi:1;
 242                 u64 reserved2:46;
 243         };
 244 };
 245
 246 /* Define the format of the SIMP register */
 247 union hv_synic_simp {
 248         u64 as_uint64;
 249         struct {
 250                 u64 simp_enabled:1;
 251                 u64 preserved:11;
 252                 u64 base_simp_gpa:52;
 253         };
 254 };
 255
 256 /* Define the format of the SIEFP register */
 257 union hv_synic_siefp {
 258         u64 as_uint64;
 259         struct {
 260                 u64 siefp_enabled:1;
 261                 u64 preserved:11;
 262                 u64 base_siefp_gpa:52;
 263         };
 264 };
 265
 266 /* Definitions for the monitored notification facility */
 267 union hv_monitor_trigger_group {
 268         u64 as_uint64;
 269         struct {
 270                 u32 pending;
 271                 u32 armed;
 272         };
 273 };
 274
 275 struct hv_monitor_parameter {
 276         union hv_connection_id connectionid;
 277         u16 flagnumber;
 278         u16 rsvdz;
 279 };
 280
 281 union hv_monitor_trigger_state {
 282         u32 asu32;
 283
 284         struct {
 285                 u32 group_enable:4;
 286                 u32 rsvdz:28;
 287         };
 288 };
 289
 290 /* struct hv_monitor_page Layout */
 291 /* ------------------------------------------------------ */
 292 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
 293 /* | 8   | TriggerGroup[0]                              | */
 294 /* | 10  | TriggerGroup[1]                              | */
 295 /* | 18  | TriggerGroup[2]                              | */
 296 /* | 20  | TriggerGroup[3]                              | */
 297 /* | 28  | Rsvd2[0]                                     | */
 298 /* | 30  | Rsvd2[1]                                     | */
 299 /* | 38  | Rsvd2[2]                                     | */
 300 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
 301 /* | ...                                                | */
 302 /* | 240 | Latency[0][0..3]                             | */
 303 /* | 340 | Rsvz3[0]                                     | */
 304 /* | 440 | Parameter[0][0]                              | */
 305 /* | 448 | Parameter[0][1]                              | */
 306 /* | ...                                                | */
 307 /* | 840 | Rsvd4[0]                                     | */
 308 /* ------------------------------------------------------ */
 309 struct hv_monitor_page {
 310         union hv_monitor_trigger_state trigger_state;
 311         u32 rsvdz1;
 312
 313         union hv_monitor_trigger_group trigger_group[4];
 314         u64 rsvdz2[3];
 315
 316         s32 next_checktime[4][32];
 317
 318         u16 latency[4][32];
 319         u64 rsvdz3[32];
 320
 321         struct hv_monitor_parameter parameter[4][32];
 322
 323         u8 rsvdz4[1984];
 324 };
 325
 326 /* Declare the various hypercall operations. */
 327 enum hv_call_code {
 328         HVCALL_POST_MESSAGE     = 0x005c,
 329         HVCALL_SIGNAL_EVENT     = 0x005d,
 330 };
 331
 332 /* Definition of the hv_post_message hypercall input structure. */
 333 struct hv_input_post_message {
 334         union hv_connection_id connectionid;
 335         u32 reserved;
 336         enum hv_message_type message_type;
 337         u32 payload_size;
 338         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 339 };
 340
 341 /* Definition of the hv_signal_event hypercall input structure. */
 342 struct hv_input_signal_event {
 343         union hv_connection_id connectionid;
 344         u16 flag_number;
 345         u16 rsvdz;
 346 };
 347
 348 /*
 349  * Versioning definitions used for guests reporting themselves to the
 350  * hypervisor, and visa versa.
 351  */
 352
 353 /* Version info reported by guest OS's */
 354 enum hv_guest_os_vendor {
 355         HVGUESTOS_VENDOR_MICROSOFT      = 0x0001
 356 };
 357
 358 enum hv_guest_os_microsoft_ids {
 359         HVGUESTOS_MICROSOFT_UNDEFINED   = 0x00,
 360         HVGUESTOS_MICROSOFT_MSDOS               = 0x01,
 361         HVGUESTOS_MICROSOFT_WINDOWS3X   = 0x02,
 362         HVGUESTOS_MICROSOFT_WINDOWS9X   = 0x03,
 363         HVGUESTOS_MICROSOFT_WINDOWSNT   = 0x04,
 364         HVGUESTOS_MICROSOFT_WINDOWSCE   = 0x05
 365 };
 366
 367 /*
 368  * Declare the MSR used to identify the guest OS.
 369  */
 370 #define HV_X64_MSR_GUEST_OS_ID  0x40000000
 371
 372 union hv_x64_msr_guest_os_id_contents {
 373         u64 as_uint64;
 374         struct {
 375                 u64 build_number:16;
 376                 u64 service_version:8; /* Service Pack, etc. */
 377                 u64 minor_version:8;
 378                 u64 major_version:8;
 379                 u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
 380                 u64 vendor_id:16; /* enum hv_guest_os_vendor */
 381         };
 382 };
 383
 384 /*
 385  * Declare the MSR used to setup pages used to communicate with the hypervisor.
 386  */
 387 #define HV_X64_MSR_HYPERCALL    0x40000001
 388
 389 union hv_x64_msr_hypercall_contents {
 390         u64 as_uint64;
 391         struct {
 392                 u64 enable:1;
 393                 u64 reserved:11;
 394                 u64 guest_physical_address:52;
 395         };
 396 };
 397
 398
 399 enum {
 400         VMBUS_MESSAGE_CONNECTION_ID     = 1,
 401         VMBUS_MESSAGE_PORT_ID           = 1,
 402         VMBUS_EVENT_CONNECTION_ID       = 2,
 403         VMBUS_EVENT_PORT_ID             = 2,
 404         VMBUS_MONITOR_CONNECTION_ID     = 3,
 405         VMBUS_MONITOR_PORT_ID           = 3,
 406         VMBUS_MESSAGE_SINT              = 2,
 407 };
 408
 409 /* #defines */
 410
 411 #define HV_PRESENT_BIT                  0x80000000
 412
 413 #define HV_LINUX_GUEST_ID_LO            0x00000000
 414 #define HV_LINUX_GUEST_ID_HI            0xB16B00B5
 415 #define HV_LINUX_GUEST_ID               (((u64)HV_LINUX_GUEST_ID_HI << 32) | \
 416                                            HV_LINUX_GUEST_ID_LO)
 417
 418 #define HV_CPU_POWER_MANAGEMENT         (1 << 0)
 419 #define HV_RECOMMENDATIONS_MAX          4
 420
 421 #define HV_X64_MAX                      5
 422 #define HV_CAPS_MAX                     8
 423
 424
 425 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
 426
 427
 428 /* Service definitions */
 429
 430 #define HV_SERVICE_PARENT_PORT                          (0)
 431 #define HV_SERVICE_PARENT_CONNECTION                    (0)
 432
 433 #define HV_SERVICE_CONNECT_RESPONSE_SUCCESS             (0)
 434 #define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER   (1)
 435 #define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE     (2)
 436 #define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
 437
 438 #define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID           (1)
 439 #define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID          (2)
 440 #define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID        (3)
 441 #define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID       (4)
 442 #define HV_SERVICE_MAX_MESSAGE_ID                               (4)
 443
 444 #define HV_SERVICE_PROTOCOL_VERSION (0x0010)
 445 #define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
 446
 447 /* #define VMBUS_REVISION_NUMBER        6 */
 448
 449 /* Our local vmbus's port and connection id. Anything >0 is fine */
 450 /* #define VMBUS_PORT_ID                11 */
 451
 452 /* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
 453 static const uuid_le VMBUS_SERVICE_ID = {
 454         .b = {
 455                 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
 456                 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
 457         },
 458 };
 459
 460
 461
 462 struct hv_input_signal_event_buffer {
 463         u64 align8;
 464         struct hv_input_signal_event event;
 465 };
 466
 467 struct hv_context {
 468         /* We only support running on top of Hyper-V
 469         * So at this point this really can only contain the Hyper-V ID
 470         */
 471         u64 guestid;
 472
 473         void *hypercall_page;
 474
 475         bool synic_initialized;
 476
 477         /*
 478          * This is used as an input param to HvCallSignalEvent hypercall. The
 479          * input param is immutable in our usage and must be dynamic mem (vs
 480          * stack or global). */
 481         struct hv_input_signal_event_buffer *signal_event_buffer;
 482         /* 8-bytes aligned of the buffer above */
 483         struct hv_input_signal_event *signal_event_param;
 484
 485         void *synic_message_page[NR_CPUS];
 486         void *synic_event_page[NR_CPUS];
 487 };
 488
 489 extern struct hv_context hv_context;
 490
 491
 492 /* Hv Interface */
 493
 494 extern int hv_init(void);
 495
 496 extern void hv_cleanup(void);
 497
 498 extern u16 hv_post_message(union hv_connection_id connection_id,
 499                          enum hv_message_type message_type,
 500                          void *payload, size_t payload_size);
 501
 502 extern u16 hv_signal_event(void);
 503
 504 extern void hv_synic_init(void *irqarg);
 505
 506 extern void hv_synic_cleanup(void *arg);
 507
 508
 509 /* Interface */
 510
 511
 512 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
 513                    u32 buflen);
 514
 515 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 516
 517 int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
 518                     struct scatterlist *sglist,
 519                     u32 sgcount);
 520
 521 int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
 522                    u32 buflen);
 523
 524 int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
 525                    void *buffer,
 526                    u32 buflen,
 527                    u32 offset);
 528
 529 u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *ring_info);
 530
 531 void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
 532                             struct hv_ring_buffer_debug_info *debug_info);
 533
 534 /*
 535  * Maximum channels is determined by the size of the interrupt page
 536  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
 537  * and the other is receive endpoint interrupt
 538  */
 539 #define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
 540
 541 /* The value here must be in multiple of 32 */
 542 /* TODO: Need to make this configurable */
 543 #define MAX_NUM_CHANNELS_SUPPORTED      256
 544
 545
 546 enum vmbus_connect_state {
 547         DISCONNECTED,
 548         CONNECTING,
 549         CONNECTED,
 550         DISCONNECTING
 551 };
 552
 553 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
 554
 555 struct vmbus_connection {
 556         enum vmbus_connect_state conn_state;
 557
 558         atomic_t next_gpadl_handle;
 559
 560         /*
 561          * Represents channel interrupts. Each bit position represents a
 562          * channel.  When a channel sends an interrupt via VMBUS, it finds its
 563          * bit in the sendInterruptPage, set it and calls Hv to generate a port
 564          * event. The other end receives the port event and parse the
 565          * recvInterruptPage to see which bit is set
 566          */
 567         void *int_page;
 568         void *send_int_page;
 569         void *recv_int_page;
 570
 571         /*
 572          * 2 pages - 1st page for parent->child notification and 2nd
 573          * is child->parent notification
 574          */
 575         void *monitor_pages;
 576         struct list_head chn_msg_list;
 577         spinlock_t channelmsg_lock;
 578
 579         /* List of channels */
 580         struct list_head chn_list;
 581         spinlock_t channel_lock;
 582
 583         struct workqueue_struct *work_queue;
 584 };
 585
 586
 587 struct vmbus_msginfo {
 588         /* Bookkeeping stuff */
 589         struct list_head msglist_entry;
 590
 591         /* The message itself */
 592         unsigned char msg[0];
 593 };
 594
 595
 596 extern struct vmbus_connection vmbus_connection;
 597
 598 /* General vmbus interface */
 599
 600 struct hv_device *vmbus_device_create(uuid_le *type,
 601                                          uuid_le *instance,
 602                                          struct vmbus_channel *channel);
 603
 604 int vmbus_device_register(struct hv_device *child_device_obj);
 605 void vmbus_device_unregister(struct hv_device *device_obj);
 606
 607 /* static void */
 608 /* VmbusChildDeviceDestroy( */
 609 /* struct hv_device *); */
 610
 611 struct vmbus_channel *relid2channel(u32 relid);
 612
 613 void vmbus_free_channels(void);
 614
 615 /* Connection interface */
 616
 617 int vmbus_connect(void);
 618
 619 int vmbus_post_msg(void *buffer, size_t buflen);
 620
 621 int vmbus_set_event(u32 child_relid);
 622
 623 void vmbus_on_event(unsigned long data);
 624
 625
 626 #endif /* _HYPERV_VMBUS_H */