1/*- 2 * Copyright (c) 2009-2012 Microsoft Corp. 3 * Copyright (c) 2012 NetApp Inc. 4 * Copyright (c) 2012 Citrix Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29/* 30 * VM Bus Driver Implementation 31 */ 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: releng/10.3/sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c 320912 2017-07-12 08:07:55Z delphij $"); 34 35#include <sys/param.h> 36#include <sys/bus.h> 37#include <sys/kernel.h> 38#include <sys/lock.h> 39#include <sys/malloc.h> 40#include <sys/module.h> 41#include <sys/proc.h> 42#include <sys/sysctl.h> 43#include <sys/syslog.h> 44#include <sys/systm.h> 45#include <sys/rtprio.h> 46#include <sys/interrupt.h> 47#include <sys/sx.h> 48#include <sys/taskqueue.h> 49#include <sys/mutex.h> 50#include <sys/smp.h> 51 52#include <machine/resource.h> 53#include <sys/rman.h> 54 55#include <machine/stdarg.h> 56#include <machine/intr_machdep.h> 57#include <machine/md_var.h> 58#include <machine/segments.h> 59#include <sys/pcpu.h> 60#include <machine/apicvar.h> 61 62#include <dev/hyperv/include/hyperv.h> 63#include "hv_vmbus_priv.h" 64 65#include <contrib/dev/acpica/include/acpi.h> 66#include "acpi_if.h" 67 68static device_t vmbus_devp; 69static int vmbus_inited; 70static hv_setup_args setup_args; /* only CPU 0 supported at this time */ 71 72static char *vmbus_ids[] = { "VMBUS", NULL }; 73 74/** 75 * @brief Software interrupt thread routine to handle channel messages from 76 * the hypervisor. 77 */ 78static void 79vmbus_msg_swintr(void *arg) 80{ 81 int cpu; 82 void* page_addr; 83 hv_vmbus_channel_msg_header *hdr; 84 hv_vmbus_channel_msg_table_entry *entry; 85 hv_vmbus_channel_msg_type msg_type; 86 hv_vmbus_message* msg; 87 hv_vmbus_message* copied; 88 static bool warned = false; 89 90 cpu = (int)(long)arg; 91 KASSERT(cpu <= mp_maxid, ("VMBUS: vmbus_msg_swintr: " 92 "cpu out of range!")); 93 94 page_addr = hv_vmbus_g_context.syn_ic_msg_page[cpu]; 95 msg = (hv_vmbus_message*) page_addr + HV_VMBUS_MESSAGE_SINT; 96 97 for (;;) { 98 if (msg->header.message_type == HV_MESSAGE_TYPE_NONE) 99 break; /* no message */ 100 101 hdr = (hv_vmbus_channel_msg_header *)msg->u.payload; 102 msg_type = hdr->message_type; 103 104 if (msg_type >= HV_CHANNEL_MESSAGE_COUNT && !warned) { 105 warned = true; 106 printf("VMBUS: unknown message type = %d\n", msg_type); 107 goto handled; 108 } 109 110 entry = &g_channel_message_table[msg_type]; 111 112 if (entry->handler_no_sleep) 113 entry->messageHandler(hdr); 114 else { 115 116 copied = malloc(sizeof(hv_vmbus_message), 117 M_DEVBUF, M_NOWAIT); 118 KASSERT(copied != NULL, 119 ("Error VMBUS: malloc failed to allocate" 120 " hv_vmbus_message!")); 121 if (copied == NULL) 122 continue; 123 124 memcpy(copied, msg, sizeof(hv_vmbus_message)); 125 hv_queue_work_item(hv_vmbus_g_connection.work_queue, 126 hv_vmbus_on_channel_message, 127 copied); 128 } 129handled: 130 msg->header.message_type = HV_MESSAGE_TYPE_NONE; 131 132 /* 133 * Make sure the write to message_type (ie set to 134 * HV_MESSAGE_TYPE_NONE) happens before we read the 135 * message_pending and EOMing. Otherwise, the EOMing will 136 * not deliver any more messages 137 * since there is no empty slot 138 */ 139 wmb(); 140 141 if (msg->header.message_flags.u.message_pending) { 142 /* 143 * This will cause message queue rescan to possibly 144 * deliver another msg from the hypervisor 145 */ 146 wrmsr(HV_X64_MSR_EOM, 0); 147 } 148 } 149} 150 151/** 152 * @brief Interrupt filter routine for VMBUS. 153 * 154 * The purpose of this routine is to determine the type of VMBUS protocol 155 * message to process - an event or a channel message. 156 */ 157static inline int 158hv_vmbus_isr(struct trapframe *frame) 159{ 160 int cpu; 161 hv_vmbus_message* msg; 162 hv_vmbus_synic_event_flags* event; 163 void* page_addr; 164 165 cpu = PCPU_GET(cpuid); 166 167 /* 168 * The Windows team has advised that we check for events 169 * before checking for messages. This is the way they do it 170 * in Windows when running as a guest in Hyper-V 171 */ 172 173 page_addr = hv_vmbus_g_context.syn_ic_event_page[cpu]; 174 event = (hv_vmbus_synic_event_flags*) 175 page_addr + HV_VMBUS_MESSAGE_SINT; 176 177 if ((hv_vmbus_protocal_version == HV_VMBUS_VERSION_WS2008) || 178 (hv_vmbus_protocal_version == HV_VMBUS_VERSION_WIN7)) { 179 /* Since we are a child, we only need to check bit 0 */ 180 if (synch_test_and_clear_bit(0, &event->flags32[0])) { 181 swi_sched(hv_vmbus_g_context.event_swintr[cpu], 0); 182 } 183 } else { 184 /* 185 * On host with Win8 or above, we can directly look at 186 * the event page. If bit n is set, we have an interrupt 187 * on the channel with id n. 188 * Directly schedule the event software interrupt on 189 * current cpu. 190 */ 191 swi_sched(hv_vmbus_g_context.event_swintr[cpu], 0); 192 } 193 194 /* Check if there are actual msgs to be process */ 195 page_addr = hv_vmbus_g_context.syn_ic_msg_page[cpu]; 196 msg = (hv_vmbus_message*) page_addr + HV_VMBUS_MESSAGE_SINT; 197 198 /* we call eventtimer process the message */ 199 if (msg->header.message_type == HV_MESSAGE_TIMER_EXPIRED) { 200 msg->header.message_type = HV_MESSAGE_TYPE_NONE; 201 202 /* 203 * Make sure the write to message_type (ie set to 204 * HV_MESSAGE_TYPE_NONE) happens before we read the 205 * message_pending and EOMing. Otherwise, the EOMing will 206 * not deliver any more messages 207 * since there is no empty slot 208 */ 209 wmb(); 210 211 if (msg->header.message_flags.u.message_pending) { 212 /* 213 * This will cause message queue rescan to possibly 214 * deliver another msg from the hypervisor 215 */ 216 wrmsr(HV_X64_MSR_EOM, 0); 217 } 218 hv_et_intr(frame); 219 return (FILTER_HANDLED); 220 } 221 222 if (msg->header.message_type != HV_MESSAGE_TYPE_NONE) { 223 swi_sched(hv_vmbus_g_context.msg_swintr[cpu], 0); 224 } 225 226 return (FILTER_HANDLED); 227} 228 229uint32_t hv_vmbus_swintr_event_cpu[MAXCPU]; 230u_long *hv_vmbus_intr_cpu[MAXCPU]; 231 232void 233hv_vector_handler(struct trapframe *trap_frame) 234{ 235 int cpu; 236 237 /* 238 * Disable preemption. 239 */ 240 critical_enter(); 241 242 /* 243 * Do a little interrupt counting. 244 */ 245 cpu = PCPU_GET(cpuid); 246 (*hv_vmbus_intr_cpu[cpu])++; 247 248 hv_vmbus_isr(trap_frame); 249 250 /* 251 * Enable preemption. 252 */ 253 critical_exit(); 254} 255 256static int 257vmbus_read_ivar( 258 device_t dev, 259 device_t child, 260 int index, 261 uintptr_t* result) 262{ 263 struct hv_device *child_dev_ctx = device_get_ivars(child); 264 265 switch (index) { 266 267 case HV_VMBUS_IVAR_TYPE: 268 *result = (uintptr_t) &child_dev_ctx->class_id; 269 return (0); 270 case HV_VMBUS_IVAR_INSTANCE: 271 *result = (uintptr_t) &child_dev_ctx->device_id; 272 return (0); 273 case HV_VMBUS_IVAR_DEVCTX: 274 *result = (uintptr_t) child_dev_ctx; 275 return (0); 276 case HV_VMBUS_IVAR_NODE: 277 *result = (uintptr_t) child_dev_ctx->device; 278 return (0); 279 } 280 return (ENOENT); 281} 282 283static int 284vmbus_write_ivar( 285 device_t dev, 286 device_t child, 287 int index, 288 uintptr_t value) 289{ 290 switch (index) { 291 292 case HV_VMBUS_IVAR_TYPE: 293 case HV_VMBUS_IVAR_INSTANCE: 294 case HV_VMBUS_IVAR_DEVCTX: 295 case HV_VMBUS_IVAR_NODE: 296 /* read-only */ 297 return (EINVAL); 298 } 299 return (ENOENT); 300} 301 302static int 303vmbus_child_pnpinfo_str(device_t dev, device_t child, char *buf, size_t buflen) 304{ 305 char guidbuf[40]; 306 struct hv_device *dev_ctx = device_get_ivars(child); 307 308 strlcat(buf, "classid=", buflen); 309 snprintf_hv_guid(guidbuf, sizeof(guidbuf), &dev_ctx->class_id); 310 strlcat(buf, guidbuf, buflen); 311 312 strlcat(buf, " deviceid=", buflen); 313 snprintf_hv_guid(guidbuf, sizeof(guidbuf), &dev_ctx->device_id); 314 strlcat(buf, guidbuf, buflen); 315 316 return (0); 317} 318 319struct hv_device* 320hv_vmbus_child_device_create( 321 hv_guid type, 322 hv_guid instance, 323 hv_vmbus_channel* channel) 324{ 325 hv_device* child_dev; 326 327 /* 328 * Allocate the new child device 329 */ 330 child_dev = malloc(sizeof(hv_device), M_DEVBUF, 331 M_NOWAIT | M_ZERO); 332 KASSERT(child_dev != NULL, 333 ("Error VMBUS: malloc failed to allocate hv_device!")); 334 335 if (child_dev == NULL) 336 return (NULL); 337 338 child_dev->channel = channel; 339 memcpy(&child_dev->class_id, &type, sizeof(hv_guid)); 340 memcpy(&child_dev->device_id, &instance, sizeof(hv_guid)); 341 342 return (child_dev); 343} 344 345int 346snprintf_hv_guid(char *buf, size_t sz, const hv_guid *guid) 347{ 348 int cnt; 349 const unsigned char *d = guid->data; 350 351 cnt = snprintf(buf, sz, 352 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", 353 d[3], d[2], d[1], d[0], d[5], d[4], d[7], d[6], 354 d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]); 355 return (cnt); 356} 357 358int 359hv_vmbus_child_device_register(struct hv_device *child_dev) 360{ 361 device_t child; 362 int ret = 0; 363 364 if (bootverbose) { 365 char name[40]; 366 snprintf_hv_guid(name, sizeof(name), &child_dev->class_id); 367 printf("VMBUS: Class ID: %s\n", name); 368 } 369 370 child = device_add_child(vmbus_devp, NULL, -1); 371 child_dev->device = child; 372 device_set_ivars(child, child_dev); 373 374 mtx_lock(&Giant); 375 ret = device_probe_and_attach(child); 376 mtx_unlock(&Giant); 377 378 return (0); 379} 380 381int 382hv_vmbus_child_device_unregister(struct hv_device *child_dev) 383{ 384 int ret = 0; 385 /* 386 * XXXKYS: Ensure that this is the opposite of 387 * device_add_child() 388 */ 389 mtx_lock(&Giant); 390 ret = device_delete_child(vmbus_devp, child_dev->device); 391 mtx_unlock(&Giant); 392 return(ret); 393} 394 395static int 396vmbus_probe(device_t dev) { 397 if (ACPI_ID_PROBE(device_get_parent(dev), dev, vmbus_ids) == NULL || 398 device_get_unit(dev) != 0) 399 return (ENXIO); 400 401 device_set_desc(dev, "Vmbus Devices"); 402 403 return (BUS_PROBE_DEFAULT); 404} 405 406#ifdef HYPERV 407extern inthand_t IDTVEC(rsvd), IDTVEC(hv_vmbus_callback); 408 409/** 410 * @brief Find a free IDT slot and setup the interrupt handler. 411 */ 412static int 413vmbus_vector_alloc(void) 414{ 415 int vector; 416 uintptr_t func; 417 struct gate_descriptor *ip; 418 419 /* 420 * Search backwards form the highest IDT vector available for use 421 * as vmbus channel callback vector. We install 'hv_vmbus_callback' 422 * handler at that vector and use it to interrupt vcpus. 423 */ 424 vector = APIC_SPURIOUS_INT; 425 while (--vector >= APIC_IPI_INTS) { 426 ip = &idt[vector]; 427 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset); 428 if (func == (uintptr_t)&IDTVEC(rsvd)) { 429#ifdef __i386__ 430 setidt(vector , IDTVEC(hv_vmbus_callback), SDT_SYS386IGT, 431 SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 432#else 433 setidt(vector , IDTVEC(hv_vmbus_callback), SDT_SYSIGT, 434 SEL_KPL, 0); 435#endif 436 437 return (vector); 438 } 439 } 440 return (0); 441} 442 443/** 444 * @brief Restore the IDT slot to rsvd. 445 */ 446static void 447vmbus_vector_free(int vector) 448{ 449 uintptr_t func; 450 struct gate_descriptor *ip; 451 452 if (vector == 0) 453 return; 454 455 KASSERT(vector >= APIC_IPI_INTS && vector < APIC_SPURIOUS_INT, 456 ("invalid vector %d", vector)); 457 458 ip = &idt[vector]; 459 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset); 460 KASSERT(func == (uintptr_t)&IDTVEC(hv_vmbus_callback), 461 ("invalid vector %d", vector)); 462 463 setidt(vector, IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 464} 465 466#else /* HYPERV */ 467 468static int 469vmbus_vector_alloc(void) 470{ 471 return(0); 472} 473 474static void 475vmbus_vector_free(int vector) 476{ 477} 478 479#endif /* HYPERV */ 480 481/** 482 * @brief Main vmbus driver initialization routine. 483 * 484 * Here, we 485 * - initialize the vmbus driver context 486 * - setup various driver entry points 487 * - invoke the vmbus hv main init routine 488 * - get the irq resource 489 * - invoke the vmbus to add the vmbus root device 490 * - setup the vmbus root device 491 * - retrieve the channel offers 492 */ 493static int 494vmbus_bus_init(void) 495{ 496 int i, j, n, ret; 497 char buf[MAXCOMLEN + 1]; 498 499 if (vmbus_inited) 500 return (0); 501 502 vmbus_inited = 1; 503 504 ret = hv_vmbus_init(); 505 506 if (ret) { 507 if(bootverbose) 508 printf("Error VMBUS: Hypervisor Initialization Failed!\n"); 509 return (ret); 510 } 511 512 /* 513 * Find a free IDT slot for vmbus callback. 514 */ 515 hv_vmbus_g_context.hv_cb_vector = vmbus_vector_alloc(); 516 517 if (hv_vmbus_g_context.hv_cb_vector == 0) { 518 if(bootverbose) 519 printf("Error VMBUS: Cannot find free IDT slot for " 520 "vmbus callback!\n"); 521 goto cleanup; 522 } 523 524 if(bootverbose) 525 printf("VMBUS: vmbus callback vector %d\n", 526 hv_vmbus_g_context.hv_cb_vector); 527 528 /* 529 * Notify the hypervisor of our vector. 530 */ 531 setup_args.vector = hv_vmbus_g_context.hv_cb_vector; 532 533 CPU_FOREACH(j) { 534 hv_vmbus_swintr_event_cpu[j] = 0; 535 hv_vmbus_g_context.hv_event_intr_event[j] = NULL; 536 hv_vmbus_g_context.hv_msg_intr_event[j] = NULL; 537 hv_vmbus_g_context.event_swintr[j] = NULL; 538 hv_vmbus_g_context.msg_swintr[j] = NULL; 539 540 snprintf(buf, sizeof(buf), "cpu%d:hyperv", j); 541 intrcnt_add(buf, &hv_vmbus_intr_cpu[j]); 542 543 for (i = 0; i < 2; i++) 544 setup_args.page_buffers[2 * j + i] = NULL; 545 } 546 547 /* 548 * Per cpu setup. 549 */ 550 CPU_FOREACH(j) { 551 /* 552 * Setup software interrupt thread and handler for msg handling. 553 */ 554 ret = swi_add(&hv_vmbus_g_context.hv_msg_intr_event[j], 555 "hv_msg", vmbus_msg_swintr, (void *)(long)j, SWI_CLOCK, 0, 556 &hv_vmbus_g_context.msg_swintr[j]); 557 if (ret) { 558 if(bootverbose) 559 printf("VMBUS: failed to setup msg swi for " 560 "cpu %d\n", j); 561 goto cleanup1; 562 } 563 564 /* 565 * Bind the swi thread to the cpu. 566 */ 567 ret = intr_event_bind(hv_vmbus_g_context.hv_msg_intr_event[j], 568 j); 569 if (ret) { 570 if(bootverbose) 571 printf("VMBUS: failed to bind msg swi thread " 572 "to cpu %d\n", j); 573 goto cleanup1; 574 } 575 576 /* 577 * Setup software interrupt thread and handler for 578 * event handling. 579 */ 580 ret = swi_add(&hv_vmbus_g_context.hv_event_intr_event[j], 581 "hv_event", hv_vmbus_on_events, (void *)(long)j, 582 SWI_CLOCK, 0, &hv_vmbus_g_context.event_swintr[j]); 583 if (ret) { 584 if(bootverbose) 585 printf("VMBUS: failed to setup event swi for " 586 "cpu %d\n", j); 587 goto cleanup1; 588 } 589 590 /* 591 * Prepare the per cpu msg and event pages to be called on each cpu. 592 */ 593 for(i = 0; i < 2; i++) { 594 setup_args.page_buffers[2 * j + i] = 595 malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO); 596 if (setup_args.page_buffers[2 * j + i] == NULL) { 597 KASSERT(setup_args.page_buffers[2 * j + i] != NULL, 598 ("Error VMBUS: malloc failed!")); 599 goto cleanup1; 600 } 601 } 602 } 603 604 if (bootverbose) 605 printf("VMBUS: Calling smp_rendezvous, smp_started = %d\n", 606 smp_started); 607 608 smp_rendezvous(NULL, hv_vmbus_synic_init, NULL, &setup_args); 609 610 /* 611 * Connect to VMBus in the root partition 612 */ 613 ret = hv_vmbus_connect(); 614 615 if (ret != 0) 616 goto cleanup1; 617 618 hv_vmbus_request_channel_offers(); 619 return (ret); 620 621 cleanup1: 622 /* 623 * Free pages alloc'ed 624 */ 625 for (n = 0; n < 2 * MAXCPU; n++) 626 if (setup_args.page_buffers[n] != NULL) 627 free(setup_args.page_buffers[n], M_DEVBUF); 628 629 /* 630 * remove swi and vmbus callback vector; 631 */ 632 CPU_FOREACH(j) { 633 if (hv_vmbus_g_context.msg_swintr[j] != NULL) 634 swi_remove(hv_vmbus_g_context.msg_swintr[j]); 635 if (hv_vmbus_g_context.event_swintr[j] != NULL) 636 swi_remove(hv_vmbus_g_context.event_swintr[j]); 637 hv_vmbus_g_context.hv_msg_intr_event[j] = NULL; 638 hv_vmbus_g_context.hv_event_intr_event[j] = NULL; 639 } 640 641 vmbus_vector_free(hv_vmbus_g_context.hv_cb_vector); 642 643 cleanup: 644 hv_vmbus_cleanup(); 645 646 return (ret); 647} 648 649static int 650vmbus_attach(device_t dev) 651{ 652 if(bootverbose) 653 device_printf(dev, "VMBUS: attach dev: %p\n", dev); 654 vmbus_devp = dev; 655 656 /* 657 * If the system has already booted and thread 658 * scheduling is possible indicated by the global 659 * cold set to zero, we just call the driver 660 * initialization directly. 661 */ 662 if (!cold) 663 vmbus_bus_init(); 664 665 return (0); 666} 667 668static void 669vmbus_init(void) 670{ 671 if (vm_guest != VM_GUEST_HV) 672 return; 673 674 /* 675 * If the system has already booted and thread 676 * scheduling is possible, as indicated by the 677 * global cold set to zero, we just call the driver 678 * initialization directly. 679 */ 680 if (!cold) 681 vmbus_bus_init(); 682} 683 684static void 685vmbus_bus_exit(void) 686{ 687 int i; 688 689 hv_vmbus_release_unattached_channels(); 690 hv_vmbus_disconnect(); 691 692 smp_rendezvous(NULL, hv_vmbus_synic_cleanup, NULL, NULL); 693 694 for(i = 0; i < 2 * MAXCPU; i++) { 695 if (setup_args.page_buffers[i] != 0) 696 free(setup_args.page_buffers[i], M_DEVBUF); 697 } 698 699 hv_vmbus_cleanup(); 700 701 /* remove swi */ 702 CPU_FOREACH(i) { 703 if (hv_vmbus_g_context.msg_swintr[i] != NULL) 704 swi_remove(hv_vmbus_g_context.msg_swintr[i]); 705 if (hv_vmbus_g_context.event_swintr[i] != NULL) 706 swi_remove(hv_vmbus_g_context.event_swintr[i]); 707 hv_vmbus_g_context.hv_msg_intr_event[i] = NULL; 708 hv_vmbus_g_context.hv_event_intr_event[i] = NULL; 709 } 710 711 vmbus_vector_free(hv_vmbus_g_context.hv_cb_vector); 712 713 return; 714} 715 716static void 717vmbus_exit(void) 718{ 719 vmbus_bus_exit(); 720} 721 722static int 723vmbus_detach(device_t dev) 724{ 725 vmbus_exit(); 726 return (0); 727} 728 729static void 730vmbus_mod_load(void) 731{ 732 if(bootverbose) 733 printf("VMBUS: load\n"); 734} 735 736static void 737vmbus_mod_unload(void) 738{ 739 if(bootverbose) 740 printf("VMBUS: unload\n"); 741} 742 743static int 744vmbus_modevent(module_t mod, int what, void *arg) 745{ 746 switch (what) { 747 748 case MOD_LOAD: 749 vmbus_mod_load(); 750 break; 751 case MOD_UNLOAD: 752 vmbus_mod_unload(); 753 break; 754 } 755 756 return (0); 757} 758 759static device_method_t vmbus_methods[] = { 760 /** Device interface */ 761 DEVMETHOD(device_probe, vmbus_probe), 762 DEVMETHOD(device_attach, vmbus_attach), 763 DEVMETHOD(device_detach, vmbus_detach), 764 DEVMETHOD(device_shutdown, bus_generic_shutdown), 765 DEVMETHOD(device_suspend, bus_generic_suspend), 766 DEVMETHOD(device_resume, bus_generic_resume), 767 768 /** Bus interface */ 769 DEVMETHOD(bus_add_child, bus_generic_add_child), 770 DEVMETHOD(bus_print_child, bus_generic_print_child), 771 DEVMETHOD(bus_read_ivar, vmbus_read_ivar), 772 DEVMETHOD(bus_write_ivar, vmbus_write_ivar), 773 DEVMETHOD(bus_child_pnpinfo_str, vmbus_child_pnpinfo_str), 774 775 { 0, 0 } }; 776 777static char driver_name[] = "vmbus"; 778static driver_t vmbus_driver = { driver_name, vmbus_methods,0, }; 779 780 781devclass_t vmbus_devclass; 782 783DRIVER_MODULE(vmbus, acpi, vmbus_driver, vmbus_devclass, vmbus_modevent, 0); 784MODULE_DEPEND(vmbus, acpi, 1, 1, 1); 785MODULE_VERSION(vmbus, 1); 786 787/* We want to be started after SMP is initialized */ 788SYSINIT(vmb_init, SI_SUB_SMP + 1, SI_ORDER_FIRST, vmbus_init, NULL); 789 790