drivers/staging/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
  32 #include "hyperv.h"
  33
  34 /*
  35  * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
  36  * is set by CPUID(HVCPUID_VERSION_FEATURES).
  37  */
  38 enum hv_cpuid_function {
  39         HVCPUID_VERSION_FEATURES                = 0x00000001,
  40         HVCPUID_VENDOR_MAXFUNCTION              = 0x40000000,
  41         HVCPUID_INTERFACE                       = 0x40000001,
  42
  43         /*
  44          * The remaining functions depend on the value of
  45          * HVCPUID_INTERFACE
  46          */
  47         HVCPUID_VERSION                 = 0x40000002,
  48         HVCPUID_FEATURES                        = 0x40000003,
  49         HVCPUID_ENLIGHTENMENT_INFO      = 0x40000004,
  50         HVCPUID_IMPLEMENTATION_LIMITS           = 0x40000005,
  51 };
  52
  53 /* Define version of the synthetic interrupt controller. */
  54 #define HV_SYNIC_VERSION                (1)
  55
  56 /* Define the expected SynIC version. */
  57 #define HV_SYNIC_VERSION_1              (0x1)
  58
  59 /* Define synthetic interrupt controller message constants. */
  60 #define HV_MESSAGE_SIZE                 (256)
  61 #define HV_MESSAGE_PAYLOAD_BYTE_COUNT   (240)
  62 #define HV_MESSAGE_PAYLOAD_QWORD_COUNT  (30)
  63 #define HV_ANY_VP                       (0xFFFFFFFF)
  64
  65 /* Define synthetic interrupt controller flag constants. */
  66 #define HV_EVENT_FLAGS_COUNT            (256 * 8)
  67 #define HV_EVENT_FLAGS_BYTE_COUNT       (256)
  68 #define HV_EVENT_FLAGS_DWORD_COUNT      (256 / sizeof(u32))
  69
  70 /* Define hypervisor message types. */
  71 enum hv_message_type {
  72         HVMSG_NONE                      = 0x00000000,
  73
  74         /* Memory access messages. */
  75         HVMSG_UNMAPPED_GPA              = 0x80000000,
  76         HVMSG_GPA_INTERCEPT             = 0x80000001,
  77
  78         /* Timer notification messages. */
  79         HVMSG_TIMER_EXPIRED                     = 0x80000010,
  80
  81         /* Error messages. */
  82         HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
  83         HVMSG_UNRECOVERABLE_EXCEPTION   = 0x80000021,
  84         HVMSG_UNSUPPORTED_FEATURE               = 0x80000022,
  85
  86         /* Trace buffer complete messages. */
  87         HVMSG_EVENTLOG_BUFFERCOMPLETE   = 0x80000040,
  88
  89         /* Platform-specific processor intercept messages. */
  90         HVMSG_X64_IOPORT_INTERCEPT              = 0x80010000,
  91         HVMSG_X64_MSR_INTERCEPT         = 0x80010001,
  92         HVMSG_X64_CPUID_INTERCEPT               = 0x80010002,
  93         HVMSG_X64_EXCEPTION_INTERCEPT   = 0x80010003,
  94         HVMSG_X64_APIC_EOI                      = 0x80010004,
  95         HVMSG_X64_LEGACY_FP_ERROR               = 0x80010005
  96 };
  97
  98 /* Define the number of synthetic interrupt sources. */
  99 #define HV_SYNIC_SINT_COUNT             (16)
 100 #define HV_SYNIC_STIMER_COUNT           (4)
 101
 102 /* Define invalid partition identifier. */
 103 #define HV_PARTITION_ID_INVALID         ((u64)0x0)
 104
 105 /* Define connection identifier type. */
 106 union hv_connection_id {
 107         u32 asu32;
 108         struct {
 109                 u32 id:24;
 110                 u32 reserved:8;
 111         } u;
 112 };
 113
 114 /* Define port identifier type. */
 115 union hv_port_id {
 116         u32 asu32;
 117         struct {
 118                 u32 id:24;
 119                 u32 reserved:8;
 120         } u ;
 121 };
 122
 123 /* Define port type. */
 124 enum hv_port_type {
 125         HVPORT_MSG      = 1,
 126         HVPORT_EVENT            = 2,
 127         HVPORT_MONITOR  = 3
 128 };
 129
 130 /* Define port information structure. */
 131 struct hv_port_info {
 132         enum hv_port_type port_type;
 133         u32 padding;
 134         union {
 135                 struct {
 136                         u32 target_sint;
 137                         u32 target_vp;
 138                         u64 rsvdz;
 139                 } message_port_info;
 140                 struct {
 141                         u32 target_sint;
 142                         u32 target_vp;
 143                         u16 base_flag_bumber;
 144                         u16 flag_count;
 145                         u32 rsvdz;
 146                 } event_port_info;
 147                 struct {
 148                         u64 monitor_address;
 149                         u64 rsvdz;
 150                 } monitor_port_info;
 151         };
 152 };
 153
 154 struct hv_connection_info {
 155         enum hv_port_type port_type;
 156         u32 padding;
 157         union {
 158                 struct {
 159                         u64 rsvdz;
 160                 } message_connection_info;
 161                 struct {
 162                         u64 rsvdz;
 163                 } event_connection_info;
 164                 struct {
 165                         u64 monitor_address;
 166                 } monitor_connection_info;
 167         };
 168 };
 169
 170 /* Define synthetic interrupt controller message flags. */
 171 union hv_message_flags {
 172         u8 asu8;
 173         struct {
 174                 u8 msg_pending:1;
 175                 u8 reserved:7;
 176         };
 177 };
 178
 179 /* Define synthetic interrupt controller message header. */
 180 struct hv_message_header {
 181         enum hv_message_type message_type;
 182         u8 payload_size;
 183         union hv_message_flags message_flags;
 184         u8 reserved[2];
 185         union {
 186                 u64 sender;
 187                 union hv_port_id port;
 188         };
 189 };
 190
 191 /* Define timer message payload structure. */
 192 struct hv_timer_message_payload {
 193         u32 timer_index;
 194         u32 reserved;
 195         u64 expiration_time;    /* When the timer expired */
 196         u64 delivery_time;      /* When the message was delivered */
 197 };
 198
 199 /* Define synthetic interrupt controller message format. */
 200 struct hv_message {
 201         struct hv_message_header header;
 202         union {
 203                 u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 204         } u ;
 205 };
 206
 207 /* Define the number of message buffers associated with each port. */
 208 #define HV_PORT_MESSAGE_BUFFER_COUNT    (16)
 209
 210 /* Define the synthetic interrupt message page layout. */
 211 struct hv_message_page {
 212         struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
 213 };
 214
 215 /* Define the synthetic interrupt controller event flags format. */
 216 union hv_synic_event_flags {
 217         u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
 218         u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
 219 };
 220
 221 /* Define the synthetic interrupt flags page layout. */
 222 struct hv_synic_event_flags_page {
 223         union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
 224 };
 225
 226 /* Define SynIC control register. */
 227 union hv_synic_scontrol {
 228         u64 as_uint64;
 229         struct {
 230                 u64 enable:1;
 231                 u64 reserved:63;
 232         };
 233 };
 234
 235 /* Define synthetic interrupt source. */
 236 union hv_synic_sint {
 237         u64 as_uint64;
 238         struct {
 239                 u64 vector:8;
 240                 u64 reserved1:8;
 241                 u64 masked:1;
 242                 u64 auto_eoi:1;
 243                 u64 reserved2:46;
 244         };
 245 };
 246
 247 /* Define the format of the SIMP register */
 248 union hv_synic_simp {
 249         u64 as_uint64;
 250         struct {
 251                 u64 simp_enabled:1;
 252                 u64 preserved:11;
 253                 u64 base_simp_gpa:52;
 254         };
 255 };
 256
 257 /* Define the format of the SIEFP register */
 258 union hv_synic_siefp {
 259         u64 as_uint64;
 260         struct {
 261                 u64 siefp_enabled:1;
 262                 u64 preserved:11;
 263                 u64 base_siefp_gpa:52;
 264         };
 265 };
 266
 267 /* Definitions for the monitored notification facility */
 268 union hv_monitor_trigger_group {
 269         u64 as_uint64;
 270         struct {
 271                 u32 pending;
 272                 u32 armed;
 273         };
 274 };
 275
 276 struct hv_monitor_parameter {
 277         union hv_connection_id connectionid;
 278         u16 flagnumber;
 279         u16 rsvdz;
 280 };
 281
 282 union hv_monitor_trigger_state {
 283         u32 asu32;
 284
 285         struct {
 286                 u32 group_enable:4;
 287                 u32 rsvdz:28;
 288         };
 289 };
 290
 291 /* struct hv_monitor_page Layout */
 292 /* ------------------------------------------------------ */
 293 /* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
 294 /* | 8   | TriggerGroup[0]                              | */
 295 /* | 10  | TriggerGroup[1]                              | */
 296 /* | 18  | TriggerGroup[2]                              | */
 297 /* | 20  | TriggerGroup[3]                              | */
 298 /* | 28  | Rsvd2[0]                                     | */
 299 /* | 30  | Rsvd2[1]                                     | */
 300 /* | 38  | Rsvd2[2]                                     | */
 301 /* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
 302 /* | ...                                                | */
 303 /* | 240 | Latency[0][0..3]                             | */
 304 /* | 340 | Rsvz3[0]                                     | */
 305 /* | 440 | Parameter[0][0]                              | */
 306 /* | 448 | Parameter[0][1]                              | */
 307 /* | ...                                                | */
 308 /* | 840 | Rsvd4[0]                                     | */
 309 /* ------------------------------------------------------ */
 310 struct hv_monitor_page {
 311         union hv_monitor_trigger_state trigger_state;
 312         u32 rsvdz1;
 313
 314         union hv_monitor_trigger_group trigger_group[4];
 315         u64 rsvdz2[3];
 316
 317         s32 next_checktime[4][32];
 318
 319         u16 latency[4][32];
 320         u64 rsvdz3[32];
 321
 322         struct hv_monitor_parameter parameter[4][32];
 323
 324         u8 rsvdz4[1984];
 325 };
 326
 327 /* Declare the various hypercall operations. */
 328 enum hv_call_code {
 329         HVCALL_POST_MESSAGE     = 0x005c,
 330         HVCALL_SIGNAL_EVENT     = 0x005d,
 331 };
 332
 333 /* Definition of the hv_post_message hypercall input structure. */
 334 struct hv_input_post_message {
 335         union hv_connection_id connectionid;
 336         u32 reserved;
 337         enum hv_message_type message_type;
 338         u32 payload_size;
 339         u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
 340 };
 341
 342 /* Definition of the hv_signal_event hypercall input structure. */
 343 struct hv_input_signal_event {
 344         union hv_connection_id connectionid;
 345         u16 flag_number;
 346         u16 rsvdz;
 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 #define HV_LINUX_GUEST_ID_LO            0x00000000
 415 #define HV_LINUX_GUEST_ID_HI            0xB16B00B5
 416 #define HV_LINUX_GUEST_ID               (((u64)HV_LINUX_GUEST_ID_HI << 32) | \
 417                                            HV_LINUX_GUEST_ID_LO)
 418
 419 #define HV_CPU_POWER_MANAGEMENT         (1 << 0)
 420 #define HV_RECOMMENDATIONS_MAX          4
 421
 422 #define HV_X64_MAX                      5
 423 #define HV_CAPS_MAX                     8
 424
 425
 426 #define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
 427
 428
 429 /* Service definitions */
 430
 431 #define HV_SERVICE_PARENT_PORT                          (0)
 432 #define HV_SERVICE_PARENT_CONNECTION                    (0)
 433
 434 #define HV_SERVICE_CONNECT_RESPONSE_SUCCESS             (0)
 435 #define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER   (1)
 436 #define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE     (2)
 437 #define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
 438
 439 #define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID           (1)
 440 #define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID          (2)
 441 #define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID        (3)
 442 #define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID       (4)
 443 #define HV_SERVICE_MAX_MESSAGE_ID                               (4)
 444
 445 #define HV_SERVICE_PROTOCOL_VERSION (0x0010)
 446 #define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
 447
 448 /* #define VMBUS_REVISION_NUMBER        6 */
 449
 450 /* Our local vmbus's port and connection id. Anything >0 is fine */
 451 /* #define VMBUS_PORT_ID                11 */
 452
 453 /* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
 454 static const struct hv_guid VMBUS_SERVICE_ID = {
 455         .data = {
 456                 0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
 457                 0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
 458         },
 459 };
 460
 461 #define MAX_NUM_CPUS    32
 462
 463
 464 struct hv_input_signal_event_buffer {
 465         u64 align8;
 466         struct hv_input_signal_event event;
 467 };
 468
 469 struct hv_context {
 470         /* We only support running on top of Hyper-V
 471         * So at this point this really can only contain the Hyper-V ID
 472         */
 473         u64 guestid;
 474
 475         void *hypercall_page;
 476
 477         bool synic_initialized;
 478
 479         /*
 480          * This is used as an input param to HvCallSignalEvent hypercall. The
 481          * input param is immutable in our usage and must be dynamic mem (vs
 482          * stack or global). */
 483         struct hv_input_signal_event_buffer *signal_event_buffer;
 484         /* 8-bytes aligned of the buffer above */
 485         struct hv_input_signal_event *signal_event_param;
 486
 487         void *synic_message_page[MAX_NUM_CPUS];
 488         void *synic_event_page[MAX_NUM_CPUS];
 489 };
 490
 491 extern struct hv_context hv_context;
 492
 493
 494 /* Hv Interface */
 495
 496 extern int hv_init(void);
 497
 498 extern void hv_cleanup(void);
 499
 500 extern u16 hv_post_message(union hv_connection_id connection_id,
 501                          enum hv_message_type message_type,
 502                          void *payload, size_t payload_size);
 503
 504 extern u16 hv_signal_event(void);
 505
 506 extern void hv_synic_init(void *irqarg);
 507
 508 extern void hv_synic_cleanup(void *arg);
 509
 510
 511 /* Interface */
 512
 513
 514 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
 515                    u32 buflen);
 516
 517 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 518
 519 int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
 520                     struct scatterlist *sglist,
 521                     u32 sgcount);
 522
 523 int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
 524                    u32 buflen);
 525
 526 int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
 527                    void *buffer,
 528                    u32 buflen,
 529                    u32 offset);
 530
 531 u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *ring_info);
 532
 533 void hv_dump_ring_info(struct hv_ring_buffer_info *ring_info, char *prefix);
 534
 535 void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
 536                             struct hv_ring_buffer_debug_info *debug_info);
 537
 538 /*
 539  * Maximum channels is determined by the size of the interrupt page
 540  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
 541  * and the other is receive endpoint interrupt
 542  */
 543 #define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
 544
 545 /* The value here must be in multiple of 32 */
 546 /* TODO: Need to make this configurable */
 547 #define MAX_NUM_CHANNELS_SUPPORTED      256
 548
 549
 550 enum vmbus_connect_state {
 551         DISCONNECTED,
 552         CONNECTING,
 553         CONNECTED,
 554         DISCONNECTING
 555 };
 556
 557 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
 558
 559 struct vmbus_connection {
 560         enum vmbus_connect_state conn_state;
 561
 562         atomic_t next_gpadl_handle;
 563
 564         /*
 565          * Represents channel interrupts. Each bit position represents a
 566          * channel.  When a channel sends an interrupt via VMBUS, it finds its
 567          * bit in the sendInterruptPage, set it and calls Hv to generate a port
 568          * event. The other end receives the port event and parse the
 569          * recvInterruptPage to see which bit is set
 570          */
 571         void *int_page;
 572         void *send_int_page;
 573         void *recv_int_page;
 574
 575         /*
 576          * 2 pages - 1st page for parent->child notification and 2nd
 577          * is child->parent notification
 578          */
 579         void *monitor_pages;
 580         struct list_head chn_msg_list;
 581         spinlock_t channelmsg_lock;
 582
 583         /* List of channels */
 584         struct list_head chn_list;
 585         spinlock_t channel_lock;
 586
 587         struct workqueue_struct *work_queue;
 588 };
 589
 590
 591 struct vmbus_msginfo {
 592         /* Bookkeeping stuff */
 593         struct list_head msglist_entry;
 594
 595         /* The message itself */
 596         unsigned char msg[0];
 597 };
 598
 599
 600 extern struct vmbus_connection vmbus_connection;
 601
 602 /* General vmbus interface */
 603
 604 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
 605                                          struct hv_guid *instance,
 606                                          struct vmbus_channel *channel);
 607
 608 int vmbus_child_device_register(struct hv_device *child_device_obj);
 609 void vmbus_child_device_unregister(struct hv_device *device_obj);
 610
 611 /* static void */
 612 /* VmbusChildDeviceDestroy( */
 613 /* struct hv_device *); */
 614
 615 struct vmbus_channel *relid2channel(u32 relid);
 616
 617
 618 /* Connection interface */
 619
 620 int vmbus_connect(void);
 621
 622 int vmbus_post_msg(void *buffer, size_t buflen);
 623
 624 int vmbus_set_event(u32 child_relid);
 625
 626 void vmbus_on_event(unsigned long data);
 627
 628
 629 #endif /* _HYPERV_VMBUS_H */