pci_passthru.c revision 295124
1/*- 2 * Copyright (c) 2011 NetApp, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/10/usr.sbin/bhyve/pci_passthru.c 295124 2016-02-01 14:56:11Z grehan $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/usr.sbin/bhyve/pci_passthru.c 295124 2016-02-01 14:56:11Z grehan $"); 31 32#include <sys/param.h> 33#include <sys/types.h> 34#include <sys/pciio.h> 35#include <sys/ioctl.h> 36 37#include <dev/io/iodev.h> 38#include <dev/pci/pcireg.h> 39 40#include <machine/iodev.h> 41 42#include <stdio.h> 43#include <stdlib.h> 44#include <string.h> 45#include <errno.h> 46#include <fcntl.h> 47#include <unistd.h> 48 49#include <machine/vmm.h> 50#include <vmmapi.h> 51#include "pci_emul.h" 52#include "mem.h" 53 54#ifndef _PATH_DEVPCI 55#define _PATH_DEVPCI "/dev/pci" 56#endif 57 58#ifndef _PATH_DEVIO 59#define _PATH_DEVIO "/dev/io" 60#endif 61 62#define LEGACY_SUPPORT 1 63 64#define MSIX_TABLE_COUNT(ctrl) (((ctrl) & PCIM_MSIXCTRL_TABLE_SIZE) + 1) 65#define MSIX_CAPLEN 12 66 67static int pcifd = -1; 68static int iofd = -1; 69 70struct passthru_softc { 71 struct pci_devinst *psc_pi; 72 struct pcibar psc_bar[PCI_BARMAX + 1]; 73 struct { 74 int capoff; 75 int msgctrl; 76 int emulated; 77 } psc_msi; 78 struct { 79 int capoff; 80 } psc_msix; 81 struct pcisel psc_sel; 82}; 83 84static int 85msi_caplen(int msgctrl) 86{ 87 int len; 88 89 len = 10; /* minimum length of msi capability */ 90 91 if (msgctrl & PCIM_MSICTRL_64BIT) 92 len += 4; 93 94#if 0 95 /* 96 * Ignore the 'mask' and 'pending' bits in the MSI capability. 97 * We'll let the guest manipulate them directly. 98 */ 99 if (msgctrl & PCIM_MSICTRL_VECTOR) 100 len += 10; 101#endif 102 103 return (len); 104} 105 106static uint32_t 107read_config(const struct pcisel *sel, long reg, int width) 108{ 109 struct pci_io pi; 110 111 bzero(&pi, sizeof(pi)); 112 pi.pi_sel = *sel; 113 pi.pi_reg = reg; 114 pi.pi_width = width; 115 116 if (ioctl(pcifd, PCIOCREAD, &pi) < 0) 117 return (0); /* XXX */ 118 else 119 return (pi.pi_data); 120} 121 122static void 123write_config(const struct pcisel *sel, long reg, int width, uint32_t data) 124{ 125 struct pci_io pi; 126 127 bzero(&pi, sizeof(pi)); 128 pi.pi_sel = *sel; 129 pi.pi_reg = reg; 130 pi.pi_width = width; 131 pi.pi_data = data; 132 133 (void)ioctl(pcifd, PCIOCWRITE, &pi); /* XXX */ 134} 135 136#ifdef LEGACY_SUPPORT 137static int 138passthru_add_msicap(struct pci_devinst *pi, int msgnum, int nextptr) 139{ 140 int capoff, i; 141 struct msicap msicap; 142 u_char *capdata; 143 144 pci_populate_msicap(&msicap, msgnum, nextptr); 145 146 /* 147 * XXX 148 * Copy the msi capability structure in the last 16 bytes of the 149 * config space. This is wrong because it could shadow something 150 * useful to the device. 151 */ 152 capoff = 256 - roundup(sizeof(msicap), 4); 153 capdata = (u_char *)&msicap; 154 for (i = 0; i < sizeof(msicap); i++) 155 pci_set_cfgdata8(pi, capoff + i, capdata[i]); 156 157 return (capoff); 158} 159#endif /* LEGACY_SUPPORT */ 160 161static int 162cfginitmsi(struct passthru_softc *sc) 163{ 164 int i, ptr, capptr, cap, sts, caplen, table_size; 165 uint32_t u32; 166 struct pcisel sel; 167 struct pci_devinst *pi; 168 struct msixcap msixcap; 169 uint32_t *msixcap_ptr; 170 171 pi = sc->psc_pi; 172 sel = sc->psc_sel; 173 174 /* 175 * Parse the capabilities and cache the location of the MSI 176 * and MSI-X capabilities. 177 */ 178 sts = read_config(&sel, PCIR_STATUS, 2); 179 if (sts & PCIM_STATUS_CAPPRESENT) { 180 ptr = read_config(&sel, PCIR_CAP_PTR, 1); 181 while (ptr != 0 && ptr != 0xff) { 182 cap = read_config(&sel, ptr + PCICAP_ID, 1); 183 if (cap == PCIY_MSI) { 184 /* 185 * Copy the MSI capability into the config 186 * space of the emulated pci device 187 */ 188 sc->psc_msi.capoff = ptr; 189 sc->psc_msi.msgctrl = read_config(&sel, 190 ptr + 2, 2); 191 sc->psc_msi.emulated = 0; 192 caplen = msi_caplen(sc->psc_msi.msgctrl); 193 capptr = ptr; 194 while (caplen > 0) { 195 u32 = read_config(&sel, capptr, 4); 196 pci_set_cfgdata32(pi, capptr, u32); 197 caplen -= 4; 198 capptr += 4; 199 } 200 } else if (cap == PCIY_MSIX) { 201 /* 202 * Copy the MSI-X capability 203 */ 204 sc->psc_msix.capoff = ptr; 205 caplen = 12; 206 msixcap_ptr = (uint32_t*) &msixcap; 207 capptr = ptr; 208 while (caplen > 0) { 209 u32 = read_config(&sel, capptr, 4); 210 *msixcap_ptr = u32; 211 pci_set_cfgdata32(pi, capptr, u32); 212 caplen -= 4; 213 capptr += 4; 214 msixcap_ptr++; 215 } 216 } 217 ptr = read_config(&sel, ptr + PCICAP_NEXTPTR, 1); 218 } 219 } 220 221 if (sc->psc_msix.capoff != 0) { 222 pi->pi_msix.pba_bar = 223 msixcap.pba_info & PCIM_MSIX_BIR_MASK; 224 pi->pi_msix.pba_offset = 225 msixcap.pba_info & ~PCIM_MSIX_BIR_MASK; 226 pi->pi_msix.table_bar = 227 msixcap.table_info & PCIM_MSIX_BIR_MASK; 228 pi->pi_msix.table_offset = 229 msixcap.table_info & ~PCIM_MSIX_BIR_MASK; 230 pi->pi_msix.table_count = MSIX_TABLE_COUNT(msixcap.msgctrl); 231 pi->pi_msix.pba_size = PBA_SIZE(pi->pi_msix.table_count); 232 233 /* Allocate the emulated MSI-X table array */ 234 table_size = pi->pi_msix.table_count * MSIX_TABLE_ENTRY_SIZE; 235 pi->pi_msix.table = calloc(1, table_size); 236 237 /* Mask all table entries */ 238 for (i = 0; i < pi->pi_msix.table_count; i++) { 239 pi->pi_msix.table[i].vector_control |= 240 PCIM_MSIX_VCTRL_MASK; 241 } 242 } 243 244#ifdef LEGACY_SUPPORT 245 /* 246 * If the passthrough device does not support MSI then craft a 247 * MSI capability for it. We link the new MSI capability at the 248 * head of the list of capabilities. 249 */ 250 if ((sts & PCIM_STATUS_CAPPRESENT) != 0 && sc->psc_msi.capoff == 0) { 251 int origptr, msiptr; 252 origptr = read_config(&sel, PCIR_CAP_PTR, 1); 253 msiptr = passthru_add_msicap(pi, 1, origptr); 254 sc->psc_msi.capoff = msiptr; 255 sc->psc_msi.msgctrl = pci_get_cfgdata16(pi, msiptr + 2); 256 sc->psc_msi.emulated = 1; 257 pci_set_cfgdata8(pi, PCIR_CAP_PTR, msiptr); 258 } 259#endif 260 261 /* Make sure one of the capabilities is present */ 262 if (sc->psc_msi.capoff == 0 && sc->psc_msix.capoff == 0) 263 return (-1); 264 else 265 return (0); 266} 267 268static uint64_t 269msix_table_read(struct passthru_softc *sc, uint64_t offset, int size) 270{ 271 struct pci_devinst *pi; 272 struct msix_table_entry *entry; 273 uint8_t *src8; 274 uint16_t *src16; 275 uint32_t *src32; 276 uint64_t *src64; 277 uint64_t data; 278 size_t entry_offset; 279 int index; 280 281 pi = sc->psc_pi; 282 if (offset < pi->pi_msix.table_offset) 283 return (-1); 284 285 offset -= pi->pi_msix.table_offset; 286 index = offset / MSIX_TABLE_ENTRY_SIZE; 287 if (index >= pi->pi_msix.table_count) 288 return (-1); 289 290 entry = &pi->pi_msix.table[index]; 291 entry_offset = offset % MSIX_TABLE_ENTRY_SIZE; 292 293 switch(size) { 294 case 1: 295 src8 = (uint8_t *)((void *)entry + entry_offset); 296 data = *src8; 297 break; 298 case 2: 299 src16 = (uint16_t *)((void *)entry + entry_offset); 300 data = *src16; 301 break; 302 case 4: 303 src32 = (uint32_t *)((void *)entry + entry_offset); 304 data = *src32; 305 break; 306 case 8: 307 src64 = (uint64_t *)((void *)entry + entry_offset); 308 data = *src64; 309 break; 310 default: 311 return (-1); 312 } 313 314 return (data); 315} 316 317static void 318msix_table_write(struct vmctx *ctx, int vcpu, struct passthru_softc *sc, 319 uint64_t offset, int size, uint64_t data) 320{ 321 struct pci_devinst *pi; 322 struct msix_table_entry *entry; 323 uint32_t *dest; 324 size_t entry_offset; 325 uint32_t vector_control; 326 int error, index; 327 328 pi = sc->psc_pi; 329 if (offset < pi->pi_msix.table_offset) 330 return; 331 332 offset -= pi->pi_msix.table_offset; 333 index = offset / MSIX_TABLE_ENTRY_SIZE; 334 if (index >= pi->pi_msix.table_count) 335 return; 336 337 entry = &pi->pi_msix.table[index]; 338 entry_offset = offset % MSIX_TABLE_ENTRY_SIZE; 339 340 /* Only 4 byte naturally-aligned writes are supported */ 341 assert(size == 4); 342 assert(entry_offset % 4 == 0); 343 344 vector_control = entry->vector_control; 345 dest = (uint32_t *)((void *)entry + entry_offset); 346 *dest = data; 347 /* If MSI-X hasn't been enabled, do nothing */ 348 if (pi->pi_msix.enabled) { 349 /* If the entry is masked, don't set it up */ 350 if ((entry->vector_control & PCIM_MSIX_VCTRL_MASK) == 0 || 351 (vector_control & PCIM_MSIX_VCTRL_MASK) == 0) { 352 error = vm_setup_pptdev_msix(ctx, vcpu, 353 sc->psc_sel.pc_bus, sc->psc_sel.pc_dev, 354 sc->psc_sel.pc_func, index, entry->addr, 355 entry->msg_data, entry->vector_control); 356 } 357 } 358} 359 360static int 361init_msix_table(struct vmctx *ctx, struct passthru_softc *sc, uint64_t base) 362{ 363 int b, s, f; 364 int error, idx; 365 size_t len, remaining; 366 uint32_t table_size, table_offset; 367 uint32_t pba_size, pba_offset; 368 vm_paddr_t start; 369 struct pci_devinst *pi = sc->psc_pi; 370 371 assert(pci_msix_table_bar(pi) >= 0 && pci_msix_pba_bar(pi) >= 0); 372 373 b = sc->psc_sel.pc_bus; 374 s = sc->psc_sel.pc_dev; 375 f = sc->psc_sel.pc_func; 376 377 /* 378 * If the MSI-X table BAR maps memory intended for 379 * other uses, it is at least assured that the table 380 * either resides in its own page within the region, 381 * or it resides in a page shared with only the PBA. 382 */ 383 table_offset = rounddown2(pi->pi_msix.table_offset, 4096); 384 385 table_size = pi->pi_msix.table_offset - table_offset; 386 table_size += pi->pi_msix.table_count * MSIX_TABLE_ENTRY_SIZE; 387 table_size = roundup2(table_size, 4096); 388 389 if (pi->pi_msix.pba_bar == pi->pi_msix.table_bar) { 390 pba_offset = pi->pi_msix.pba_offset; 391 pba_size = pi->pi_msix.pba_size; 392 if (pba_offset >= table_offset + table_size || 393 table_offset >= pba_offset + pba_size) { 394 /* 395 * The PBA can reside in the same BAR as the MSI-x 396 * tables as long as it does not overlap with any 397 * naturally aligned page occupied by the tables. 398 */ 399 } else { 400 /* Need to also emulate the PBA, not supported yet */ 401 printf("Unsupported MSI-X configuration: %d/%d/%d\n", 402 b, s, f); 403 return (-1); 404 } 405 } 406 407 idx = pi->pi_msix.table_bar; 408 start = pi->pi_bar[idx].addr; 409 remaining = pi->pi_bar[idx].size; 410 411 /* Map everything before the MSI-X table */ 412 if (table_offset > 0) { 413 len = table_offset; 414 error = vm_map_pptdev_mmio(ctx, b, s, f, start, len, base); 415 if (error) 416 return (error); 417 418 base += len; 419 start += len; 420 remaining -= len; 421 } 422 423 /* Skip the MSI-X table */ 424 base += table_size; 425 start += table_size; 426 remaining -= table_size; 427 428 /* Map everything beyond the end of the MSI-X table */ 429 if (remaining > 0) { 430 len = remaining; 431 error = vm_map_pptdev_mmio(ctx, b, s, f, start, len, base); 432 if (error) 433 return (error); 434 } 435 436 return (0); 437} 438 439static int 440cfginitbar(struct vmctx *ctx, struct passthru_softc *sc) 441{ 442 int i, error; 443 struct pci_devinst *pi; 444 struct pci_bar_io bar; 445 enum pcibar_type bartype; 446 uint64_t base, size; 447 448 pi = sc->psc_pi; 449 450 /* 451 * Initialize BAR registers 452 */ 453 for (i = 0; i <= PCI_BARMAX; i++) { 454 bzero(&bar, sizeof(bar)); 455 bar.pbi_sel = sc->psc_sel; 456 bar.pbi_reg = PCIR_BAR(i); 457 458 if (ioctl(pcifd, PCIOCGETBAR, &bar) < 0) 459 continue; 460 461 if (PCI_BAR_IO(bar.pbi_base)) { 462 bartype = PCIBAR_IO; 463 base = bar.pbi_base & PCIM_BAR_IO_BASE; 464 } else { 465 switch (bar.pbi_base & PCIM_BAR_MEM_TYPE) { 466 case PCIM_BAR_MEM_64: 467 bartype = PCIBAR_MEM64; 468 break; 469 default: 470 bartype = PCIBAR_MEM32; 471 break; 472 } 473 base = bar.pbi_base & PCIM_BAR_MEM_BASE; 474 } 475 size = bar.pbi_length; 476 477 if (bartype != PCIBAR_IO) { 478 if (((base | size) & PAGE_MASK) != 0) { 479 printf("passthru device %d/%d/%d BAR %d: " 480 "base %#lx or size %#lx not page aligned\n", 481 sc->psc_sel.pc_bus, sc->psc_sel.pc_dev, 482 sc->psc_sel.pc_func, i, base, size); 483 return (-1); 484 } 485 } 486 487 /* Cache information about the "real" BAR */ 488 sc->psc_bar[i].type = bartype; 489 sc->psc_bar[i].size = size; 490 sc->psc_bar[i].addr = base; 491 492 /* Allocate the BAR in the guest I/O or MMIO space */ 493 error = pci_emul_alloc_pbar(pi, i, base, bartype, size); 494 if (error) 495 return (-1); 496 497 /* The MSI-X table needs special handling */ 498 if (i == pci_msix_table_bar(pi)) { 499 error = init_msix_table(ctx, sc, base); 500 if (error) 501 return (-1); 502 } else if (bartype != PCIBAR_IO) { 503 /* Map the physical BAR in the guest MMIO space */ 504 error = vm_map_pptdev_mmio(ctx, sc->psc_sel.pc_bus, 505 sc->psc_sel.pc_dev, sc->psc_sel.pc_func, 506 pi->pi_bar[i].addr, pi->pi_bar[i].size, base); 507 if (error) 508 return (-1); 509 } 510 511 /* 512 * 64-bit BAR takes up two slots so skip the next one. 513 */ 514 if (bartype == PCIBAR_MEM64) { 515 i++; 516 assert(i <= PCI_BARMAX); 517 sc->psc_bar[i].type = PCIBAR_MEMHI64; 518 } 519 } 520 return (0); 521} 522 523static int 524cfginit(struct vmctx *ctx, struct pci_devinst *pi, int bus, int slot, int func) 525{ 526 int error; 527 struct passthru_softc *sc; 528 529 error = 1; 530 sc = pi->pi_arg; 531 532 bzero(&sc->psc_sel, sizeof(struct pcisel)); 533 sc->psc_sel.pc_bus = bus; 534 sc->psc_sel.pc_dev = slot; 535 sc->psc_sel.pc_func = func; 536 537 if (cfginitmsi(sc) != 0) 538 goto done; 539 540 if (cfginitbar(ctx, sc) != 0) 541 goto done; 542 543 error = 0; /* success */ 544done: 545 return (error); 546} 547 548static int 549passthru_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts) 550{ 551 int bus, slot, func, error, memflags; 552 struct passthru_softc *sc; 553 554 sc = NULL; 555 error = 1; 556 557 memflags = vm_get_memflags(ctx); 558 if (!(memflags & VM_MEM_F_WIRED)) { 559 fprintf(stderr, "passthru requires guest memory to be wired\n"); 560 goto done; 561 } 562 563 if (pcifd < 0) { 564 pcifd = open(_PATH_DEVPCI, O_RDWR, 0); 565 if (pcifd < 0) 566 goto done; 567 } 568 569 if (iofd < 0) { 570 iofd = open(_PATH_DEVIO, O_RDWR, 0); 571 if (iofd < 0) 572 goto done; 573 } 574 575 if (opts == NULL || 576 sscanf(opts, "%d/%d/%d", &bus, &slot, &func) != 3) 577 goto done; 578 579 if (vm_assign_pptdev(ctx, bus, slot, func) != 0) 580 goto done; 581 582 sc = calloc(1, sizeof(struct passthru_softc)); 583 584 pi->pi_arg = sc; 585 sc->psc_pi = pi; 586 587 /* initialize config space */ 588 if ((error = cfginit(ctx, pi, bus, slot, func)) != 0) 589 goto done; 590 591 error = 0; /* success */ 592done: 593 if (error) { 594 free(sc); 595 vm_unassign_pptdev(ctx, bus, slot, func); 596 } 597 return (error); 598} 599 600static int 601bar_access(int coff) 602{ 603 if (coff >= PCIR_BAR(0) && coff < PCIR_BAR(PCI_BARMAX + 1)) 604 return (1); 605 else 606 return (0); 607} 608 609static int 610msicap_access(struct passthru_softc *sc, int coff) 611{ 612 int caplen; 613 614 if (sc->psc_msi.capoff == 0) 615 return (0); 616 617 caplen = msi_caplen(sc->psc_msi.msgctrl); 618 619 if (coff >= sc->psc_msi.capoff && coff < sc->psc_msi.capoff + caplen) 620 return (1); 621 else 622 return (0); 623} 624 625static int 626msixcap_access(struct passthru_softc *sc, int coff) 627{ 628 if (sc->psc_msix.capoff == 0) 629 return (0); 630 631 return (coff >= sc->psc_msix.capoff && 632 coff < sc->psc_msix.capoff + MSIX_CAPLEN); 633} 634 635static int 636passthru_cfgread(struct vmctx *ctx, int vcpu, struct pci_devinst *pi, 637 int coff, int bytes, uint32_t *rv) 638{ 639 struct passthru_softc *sc; 640 641 sc = pi->pi_arg; 642 643 /* 644 * PCI BARs and MSI capability is emulated. 645 */ 646 if (bar_access(coff) || msicap_access(sc, coff)) 647 return (-1); 648 649#ifdef LEGACY_SUPPORT 650 /* 651 * Emulate PCIR_CAP_PTR if this device does not support MSI capability 652 * natively. 653 */ 654 if (sc->psc_msi.emulated) { 655 if (coff >= PCIR_CAP_PTR && coff < PCIR_CAP_PTR + 4) 656 return (-1); 657 } 658#endif 659 660 /* Everything else just read from the device's config space */ 661 *rv = read_config(&sc->psc_sel, coff, bytes); 662 663 return (0); 664} 665 666static int 667passthru_cfgwrite(struct vmctx *ctx, int vcpu, struct pci_devinst *pi, 668 int coff, int bytes, uint32_t val) 669{ 670 int error, msix_table_entries, i; 671 struct passthru_softc *sc; 672 673 sc = pi->pi_arg; 674 675 /* 676 * PCI BARs are emulated 677 */ 678 if (bar_access(coff)) 679 return (-1); 680 681 /* 682 * MSI capability is emulated 683 */ 684 if (msicap_access(sc, coff)) { 685 msicap_cfgwrite(pi, sc->psc_msi.capoff, coff, bytes, val); 686 687 error = vm_setup_pptdev_msi(ctx, vcpu, sc->psc_sel.pc_bus, 688 sc->psc_sel.pc_dev, sc->psc_sel.pc_func, 689 pi->pi_msi.addr, pi->pi_msi.msg_data, 690 pi->pi_msi.maxmsgnum); 691 if (error != 0) { 692 printf("vm_setup_pptdev_msi error %d\r\n", errno); 693 exit(1); 694 } 695 return (0); 696 } 697 698 if (msixcap_access(sc, coff)) { 699 msixcap_cfgwrite(pi, sc->psc_msix.capoff, coff, bytes, val); 700 if (pi->pi_msix.enabled) { 701 msix_table_entries = pi->pi_msix.table_count; 702 for (i = 0; i < msix_table_entries; i++) { 703 error = vm_setup_pptdev_msix(ctx, vcpu, 704 sc->psc_sel.pc_bus, sc->psc_sel.pc_dev, 705 sc->psc_sel.pc_func, i, 706 pi->pi_msix.table[i].addr, 707 pi->pi_msix.table[i].msg_data, 708 pi->pi_msix.table[i].vector_control); 709 710 if (error) { 711 printf("vm_setup_pptdev_msix error " 712 "%d\r\n", errno); 713 exit(1); 714 } 715 } 716 } 717 return (0); 718 } 719 720#ifdef LEGACY_SUPPORT 721 /* 722 * If this device does not support MSI natively then we cannot let 723 * the guest disable legacy interrupts from the device. It is the 724 * legacy interrupt that is triggering the virtual MSI to the guest. 725 */ 726 if (sc->psc_msi.emulated && pci_msi_enabled(pi)) { 727 if (coff == PCIR_COMMAND && bytes == 2) 728 val &= ~PCIM_CMD_INTxDIS; 729 } 730#endif 731 732 write_config(&sc->psc_sel, coff, bytes, val); 733 734 return (0); 735} 736 737static void 738passthru_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi, int baridx, 739 uint64_t offset, int size, uint64_t value) 740{ 741 struct passthru_softc *sc; 742 struct iodev_pio_req pio; 743 744 sc = pi->pi_arg; 745 746 if (baridx == pci_msix_table_bar(pi)) { 747 msix_table_write(ctx, vcpu, sc, offset, size, value); 748 } else { 749 assert(pi->pi_bar[baridx].type == PCIBAR_IO); 750 bzero(&pio, sizeof(struct iodev_pio_req)); 751 pio.access = IODEV_PIO_WRITE; 752 pio.port = sc->psc_bar[baridx].addr + offset; 753 pio.width = size; 754 pio.val = value; 755 756 (void)ioctl(iofd, IODEV_PIO, &pio); 757 } 758} 759 760static uint64_t 761passthru_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi, int baridx, 762 uint64_t offset, int size) 763{ 764 struct passthru_softc *sc; 765 struct iodev_pio_req pio; 766 uint64_t val; 767 768 sc = pi->pi_arg; 769 770 if (baridx == pci_msix_table_bar(pi)) { 771 val = msix_table_read(sc, offset, size); 772 } else { 773 assert(pi->pi_bar[baridx].type == PCIBAR_IO); 774 bzero(&pio, sizeof(struct iodev_pio_req)); 775 pio.access = IODEV_PIO_READ; 776 pio.port = sc->psc_bar[baridx].addr + offset; 777 pio.width = size; 778 pio.val = 0; 779 780 (void)ioctl(iofd, IODEV_PIO, &pio); 781 782 val = pio.val; 783 } 784 785 return (val); 786} 787 788struct pci_devemu passthru = { 789 .pe_emu = "passthru", 790 .pe_init = passthru_init, 791 .pe_cfgwrite = passthru_cfgwrite, 792 .pe_cfgread = passthru_cfgread, 793 .pe_barwrite = passthru_write, 794 .pe_barread = passthru_read, 795}; 796PCI_EMUL_SET(passthru); 797