1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 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 /* Driver for the legacy VirtIO PCI interface. */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/lock.h> 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 #include <sys/endian.h> 38 39 #include <machine/bus.h> 40 #include <machine/resource.h> 41 #include <sys/bus.h> 42 #include <sys/rman.h> 43 44 #include <dev/pci/pcivar.h> 45 #include <dev/pci/pcireg.h> 46 47 #include <dev/virtio/virtio.h> 48 #include <dev/virtio/virtqueue.h> 49 #include <dev/virtio/pci/virtio_pci.h> 50 #include <dev/virtio/pci/virtio_pci_legacy_var.h> 51 52 #include "virtio_bus_if.h" 53 #include "virtio_pci_if.h" 54 #include "virtio_if.h" 55 56 struct vtpci_legacy_softc { 57 device_t vtpci_dev; 58 struct vtpci_common vtpci_common; 59 int vtpci_res_type; 60 struct resource *vtpci_res; 61 struct resource *vtpci_msix_table_res; 62 struct resource *vtpci_msix_pba_res; 63 }; 64 65 static int vtpci_legacy_probe(device_t); 66 static int vtpci_legacy_attach(device_t); 67 static int vtpci_legacy_detach(device_t); 68 static int vtpci_legacy_suspend(device_t); 69 static int vtpci_legacy_resume(device_t); 70 static int vtpci_legacy_shutdown(device_t); 71 72 static void vtpci_legacy_driver_added(device_t, driver_t *); 73 static void vtpci_legacy_child_detached(device_t, device_t); 74 static int vtpci_legacy_read_ivar(device_t, device_t, int, uintptr_t *); 75 static int vtpci_legacy_write_ivar(device_t, device_t, int, uintptr_t); 76 77 static uint8_t vtpci_legacy_read_isr(device_t); 78 static uint16_t vtpci_legacy_get_vq_size(device_t, int); 79 static bus_size_t vtpci_legacy_get_vq_notify_off(device_t, int); 80 static void vtpci_legacy_set_vq(device_t, struct virtqueue *); 81 static void vtpci_legacy_disable_vq(device_t, int); 82 static int vtpci_legacy_register_cfg_msix(device_t, 83 struct vtpci_interrupt *); 84 static int vtpci_legacy_register_vq_msix(device_t, int idx, 85 struct vtpci_interrupt *); 86 87 static uint64_t vtpci_legacy_negotiate_features(device_t, uint64_t); 88 static bool vtpci_legacy_with_feature(device_t, uint64_t); 89 static int vtpci_legacy_alloc_virtqueues(device_t, int, 90 struct vq_alloc_info *); 91 static int vtpci_legacy_setup_interrupts(device_t, enum intr_type); 92 static void vtpci_legacy_stop(device_t); 93 static int vtpci_legacy_reinit(device_t, uint64_t); 94 static void vtpci_legacy_reinit_complete(device_t); 95 static void vtpci_legacy_notify_vq(device_t, uint16_t, bus_size_t); 96 static void vtpci_legacy_read_dev_config(device_t, bus_size_t, void *, int); 97 static void vtpci_legacy_write_dev_config(device_t, bus_size_t, const void *, int); 98 99 static bool vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc); 100 static void vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc); 101 static int vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *); 102 static void vtpci_legacy_free_resources(struct vtpci_legacy_softc *); 103 104 static void vtpci_legacy_probe_and_attach_child(struct vtpci_legacy_softc *); 105 106 static uint8_t vtpci_legacy_get_status(struct vtpci_legacy_softc *); 107 static void vtpci_legacy_set_status(struct vtpci_legacy_softc *, uint8_t); 108 static void vtpci_legacy_select_virtqueue(struct vtpci_legacy_softc *, int); 109 static void vtpci_legacy_reset(struct vtpci_legacy_softc *); 110 111 #define VIRTIO_PCI_LEGACY_CONFIG(_sc) \ 112 VIRTIO_PCI_CONFIG_OFF(vtpci_is_msix_enabled(&(_sc)->vtpci_common)) 113 114 #define vtpci_legacy_read_config_1(sc, o) \ 115 bus_read_1((sc)->vtpci_res, (o)) 116 #define vtpci_legacy_write_config_1(sc, o, v) \ 117 bus_write_1((sc)->vtpci_res, (o), (v)) 118 /* 119 * VirtIO specifies that PCI Configuration area is guest endian. However, 120 * since PCI devices are inherently little-endian, on big-endian systems 121 * the bus layer transparently converts it to BE. For virtio-legacy, this 122 * conversion is undesired, so an extra byte swap is required to fix it. 123 */ 124 #define vtpci_legacy_read_config_2(sc, o) \ 125 le16toh(bus_read_2((sc)->vtpci_res, (o))) 126 #define vtpci_legacy_read_config_4(sc, o) \ 127 le32toh(bus_read_4((sc)->vtpci_res, (o))) 128 #define vtpci_legacy_write_config_2(sc, o, v) \ 129 bus_write_2((sc)->vtpci_res, (o), (htole16(v))) 130 #define vtpci_legacy_write_config_4(sc, o, v) \ 131 bus_write_4((sc)->vtpci_res, (o), (htole32(v))) 132 /* PCI Header LE. On BE systems the bus layer takes care of byte swapping. */ 133 #define vtpci_legacy_read_header_2(sc, o) \ 134 bus_read_2((sc)->vtpci_res, (o)) 135 #define vtpci_legacy_read_header_4(sc, o) \ 136 bus_read_4((sc)->vtpci_res, (o)) 137 #define vtpci_legacy_write_header_2(sc, o, v) \ 138 bus_write_2((sc)->vtpci_res, (o), (v)) 139 #define vtpci_legacy_write_header_4(sc, o, v) \ 140 bus_write_4((sc)->vtpci_res, (o), (v)) 141 142 static device_method_t vtpci_legacy_methods[] = { 143 /* Device interface. */ 144 DEVMETHOD(device_probe, vtpci_legacy_probe), 145 DEVMETHOD(device_attach, vtpci_legacy_attach), 146 DEVMETHOD(device_detach, vtpci_legacy_detach), 147 DEVMETHOD(device_suspend, vtpci_legacy_suspend), 148 DEVMETHOD(device_resume, vtpci_legacy_resume), 149 DEVMETHOD(device_shutdown, vtpci_legacy_shutdown), 150 151 /* Bus interface. */ 152 DEVMETHOD(bus_driver_added, vtpci_legacy_driver_added), 153 DEVMETHOD(bus_child_detached, vtpci_legacy_child_detached), 154 DEVMETHOD(bus_child_pnpinfo, virtio_child_pnpinfo), 155 DEVMETHOD(bus_read_ivar, vtpci_legacy_read_ivar), 156 DEVMETHOD(bus_write_ivar, vtpci_legacy_write_ivar), 157 158 /* VirtIO PCI interface. */ 159 DEVMETHOD(virtio_pci_read_isr, vtpci_legacy_read_isr), 160 DEVMETHOD(virtio_pci_get_vq_size, vtpci_legacy_get_vq_size), 161 DEVMETHOD(virtio_pci_get_vq_notify_off, vtpci_legacy_get_vq_notify_off), 162 DEVMETHOD(virtio_pci_set_vq, vtpci_legacy_set_vq), 163 DEVMETHOD(virtio_pci_disable_vq, vtpci_legacy_disable_vq), 164 DEVMETHOD(virtio_pci_register_cfg_msix, vtpci_legacy_register_cfg_msix), 165 DEVMETHOD(virtio_pci_register_vq_msix, vtpci_legacy_register_vq_msix), 166 167 /* VirtIO bus interface. */ 168 DEVMETHOD(virtio_bus_negotiate_features, vtpci_legacy_negotiate_features), 169 DEVMETHOD(virtio_bus_with_feature, vtpci_legacy_with_feature), 170 DEVMETHOD(virtio_bus_alloc_virtqueues, vtpci_legacy_alloc_virtqueues), 171 DEVMETHOD(virtio_bus_setup_intr, vtpci_legacy_setup_interrupts), 172 DEVMETHOD(virtio_bus_stop, vtpci_legacy_stop), 173 DEVMETHOD(virtio_bus_reinit, vtpci_legacy_reinit), 174 DEVMETHOD(virtio_bus_reinit_complete, vtpci_legacy_reinit_complete), 175 DEVMETHOD(virtio_bus_notify_vq, vtpci_legacy_notify_vq), 176 DEVMETHOD(virtio_bus_read_device_config, vtpci_legacy_read_dev_config), 177 DEVMETHOD(virtio_bus_write_device_config, vtpci_legacy_write_dev_config), 178 179 DEVMETHOD_END 180 }; 181 182 static driver_t vtpci_legacy_driver = { 183 .name = "virtio_pci", 184 .methods = vtpci_legacy_methods, 185 .size = sizeof(struct vtpci_legacy_softc) 186 }; 187 188 DRIVER_MODULE(virtio_pci_legacy, pci, vtpci_legacy_driver, 0, 0); 189 190 static int 191 vtpci_legacy_probe(device_t dev) 192 { 193 const char *name; 194 195 if (pci_get_vendor(dev) != VIRTIO_PCI_VENDORID) 196 return (ENXIO); 197 198 if (pci_get_device(dev) < VIRTIO_PCI_DEVICEID_MIN || 199 pci_get_device(dev) > VIRTIO_PCI_DEVICEID_LEGACY_MAX) 200 return (ENXIO); 201 202 if (pci_get_revid(dev) != VIRTIO_PCI_ABI_VERSION) 203 return (ENXIO); 204 205 name = virtio_device_name(pci_get_subdevice(dev)); 206 if (name == NULL) 207 name = "Unknown"; 208 209 device_set_descf(dev, "VirtIO PCI (legacy) %s adapter", name); 210 211 /* Prefer transitional modern VirtIO PCI. */ 212 return (BUS_PROBE_LOW_PRIORITY); 213 } 214 215 static int 216 vtpci_legacy_attach(device_t dev) 217 { 218 struct vtpci_legacy_softc *sc; 219 int error; 220 221 sc = device_get_softc(dev); 222 sc->vtpci_dev = dev; 223 vtpci_init(&sc->vtpci_common, dev, false); 224 225 error = vtpci_legacy_alloc_resources(sc); 226 if (error) { 227 device_printf(dev, "cannot map I/O space nor memory space\n"); 228 return (error); 229 } 230 231 if (vtpci_is_msix_available(&sc->vtpci_common) && 232 !vtpci_legacy_setup_msix(sc)) { 233 device_printf(dev, "cannot setup MSI-x resources\n"); 234 error = ENXIO; 235 goto fail; 236 } 237 238 vtpci_legacy_reset(sc); 239 240 /* Tell the host we've noticed this device. */ 241 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK); 242 243 error = vtpci_add_child(&sc->vtpci_common); 244 if (error) 245 goto fail; 246 247 vtpci_legacy_probe_and_attach_child(sc); 248 249 return (0); 250 251 fail: 252 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_FAILED); 253 vtpci_legacy_detach(dev); 254 255 return (error); 256 } 257 258 static int 259 vtpci_legacy_detach(device_t dev) 260 { 261 struct vtpci_legacy_softc *sc; 262 int error; 263 264 sc = device_get_softc(dev); 265 266 error = vtpci_delete_child(&sc->vtpci_common); 267 if (error) 268 return (error); 269 270 vtpci_legacy_reset(sc); 271 vtpci_legacy_teardown_msix(sc); 272 vtpci_legacy_free_resources(sc); 273 274 return (0); 275 } 276 277 static int 278 vtpci_legacy_suspend(device_t dev) 279 { 280 return (bus_generic_suspend(dev)); 281 } 282 283 static int 284 vtpci_legacy_resume(device_t dev) 285 { 286 return (bus_generic_resume(dev)); 287 } 288 289 static int 290 vtpci_legacy_shutdown(device_t dev) 291 { 292 (void) bus_generic_shutdown(dev); 293 /* Forcibly stop the host device. */ 294 vtpci_legacy_stop(dev); 295 296 return (0); 297 } 298 299 static void 300 vtpci_legacy_driver_added(device_t dev, driver_t *driver) 301 { 302 vtpci_legacy_probe_and_attach_child(device_get_softc(dev)); 303 } 304 305 static void 306 vtpci_legacy_child_detached(device_t dev, device_t child) 307 { 308 struct vtpci_legacy_softc *sc; 309 310 sc = device_get_softc(dev); 311 312 vtpci_legacy_reset(sc); 313 vtpci_child_detached(&sc->vtpci_common); 314 315 /* After the reset, retell the host we've noticed this device. */ 316 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK); 317 } 318 319 static int 320 vtpci_legacy_read_ivar(device_t dev, device_t child, int index, 321 uintptr_t *result) 322 { 323 struct vtpci_legacy_softc *sc; 324 struct vtpci_common *cn; 325 326 sc = device_get_softc(dev); 327 cn = &sc->vtpci_common; 328 329 if (vtpci_child_device(cn) != child) 330 return (ENOENT); 331 332 switch (index) { 333 case VIRTIO_IVAR_DEVTYPE: 334 *result = pci_get_subdevice(dev); 335 break; 336 default: 337 return (vtpci_read_ivar(cn, index, result)); 338 } 339 340 return (0); 341 } 342 343 static int 344 vtpci_legacy_write_ivar(device_t dev, device_t child, int index, uintptr_t value) 345 { 346 struct vtpci_legacy_softc *sc; 347 struct vtpci_common *cn; 348 349 sc = device_get_softc(dev); 350 cn = &sc->vtpci_common; 351 352 if (vtpci_child_device(cn) != child) 353 return (ENOENT); 354 355 switch (index) { 356 default: 357 return (vtpci_write_ivar(cn, index, value)); 358 } 359 360 return (0); 361 } 362 363 static uint64_t 364 vtpci_legacy_negotiate_features(device_t dev, uint64_t child_features) 365 { 366 struct vtpci_legacy_softc *sc; 367 uint64_t host_features, features; 368 369 sc = device_get_softc(dev); 370 host_features = vtpci_legacy_read_header_4(sc, VIRTIO_PCI_HOST_FEATURES); 371 372 features = vtpci_negotiate_features(&sc->vtpci_common, 373 child_features, host_features); 374 vtpci_legacy_write_header_4(sc, VIRTIO_PCI_GUEST_FEATURES, features); 375 376 return (features); 377 } 378 379 static bool 380 vtpci_legacy_with_feature(device_t dev, uint64_t feature) 381 { 382 struct vtpci_legacy_softc *sc; 383 384 sc = device_get_softc(dev); 385 386 return (vtpci_with_feature(&sc->vtpci_common, feature)); 387 } 388 389 static int 390 vtpci_legacy_alloc_virtqueues(device_t dev, int nvqs, 391 struct vq_alloc_info *vq_info) 392 { 393 struct vtpci_legacy_softc *sc; 394 struct vtpci_common *cn; 395 396 sc = device_get_softc(dev); 397 cn = &sc->vtpci_common; 398 399 return (vtpci_alloc_virtqueues(cn, nvqs, vq_info)); 400 } 401 402 static int 403 vtpci_legacy_setup_interrupts(device_t dev, enum intr_type type) 404 { 405 struct vtpci_legacy_softc *sc; 406 407 sc = device_get_softc(dev); 408 409 return (vtpci_setup_interrupts(&sc->vtpci_common, type)); 410 } 411 412 static void 413 vtpci_legacy_stop(device_t dev) 414 { 415 vtpci_legacy_reset(device_get_softc(dev)); 416 } 417 418 static int 419 vtpci_legacy_reinit(device_t dev, uint64_t features) 420 { 421 struct vtpci_legacy_softc *sc; 422 struct vtpci_common *cn; 423 int error; 424 425 sc = device_get_softc(dev); 426 cn = &sc->vtpci_common; 427 428 /* 429 * Redrive the device initialization. This is a bit of an abuse of 430 * the specification, but VirtualBox, QEMU/KVM, and BHyVe seem to 431 * play nice. 432 * 433 * We do not allow the host device to change from what was originally 434 * negotiated beyond what the guest driver changed. MSIX state should 435 * not change, number of virtqueues and their size remain the same, etc. 436 * This will need to be rethought when we want to support migration. 437 */ 438 439 if (vtpci_legacy_get_status(sc) != VIRTIO_CONFIG_STATUS_RESET) 440 vtpci_legacy_stop(dev); 441 442 /* 443 * Quickly drive the status through ACK and DRIVER. The device does 444 * not become usable again until DRIVER_OK in reinit complete. 445 */ 446 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK); 447 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER); 448 449 vtpci_legacy_negotiate_features(dev, features); 450 451 error = vtpci_reinit(cn); 452 if (error) 453 return (error); 454 455 return (0); 456 } 457 458 static void 459 vtpci_legacy_reinit_complete(device_t dev) 460 { 461 struct vtpci_legacy_softc *sc; 462 463 sc = device_get_softc(dev); 464 465 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER_OK); 466 } 467 468 static void 469 vtpci_legacy_notify_vq(device_t dev, uint16_t queue, bus_size_t offset) 470 { 471 struct vtpci_legacy_softc *sc; 472 473 sc = device_get_softc(dev); 474 MPASS(offset == VIRTIO_PCI_QUEUE_NOTIFY); 475 476 vtpci_legacy_write_header_2(sc, offset, queue); 477 } 478 479 static uint8_t 480 vtpci_legacy_get_status(struct vtpci_legacy_softc *sc) 481 { 482 return (vtpci_legacy_read_config_1(sc, VIRTIO_PCI_STATUS)); 483 } 484 485 static void 486 vtpci_legacy_set_status(struct vtpci_legacy_softc *sc, uint8_t status) 487 { 488 if (status != VIRTIO_CONFIG_STATUS_RESET) 489 status |= vtpci_legacy_get_status(sc); 490 491 vtpci_legacy_write_config_1(sc, VIRTIO_PCI_STATUS, status); 492 } 493 494 static void 495 vtpci_legacy_read_dev_config(device_t dev, bus_size_t offset, 496 void *dst, int length) 497 { 498 struct vtpci_legacy_softc *sc; 499 bus_size_t off; 500 uint8_t *d; 501 int i; 502 503 sc = device_get_softc(dev); 504 off = VIRTIO_PCI_LEGACY_CONFIG(sc) + offset; 505 506 d = dst; 507 for (i = 0; i < length; i++) { 508 d[i] = vtpci_legacy_read_config_1(sc, off + i); 509 } 510 } 511 512 static void 513 vtpci_legacy_write_dev_config(device_t dev, bus_size_t offset, 514 const void *src, int length) 515 { 516 struct vtpci_legacy_softc *sc; 517 bus_size_t off; 518 const uint8_t *s; 519 int i; 520 521 sc = device_get_softc(dev); 522 off = VIRTIO_PCI_LEGACY_CONFIG(sc) + offset; 523 524 s = src; 525 for (i = 0; i < length; i++) { 526 vtpci_legacy_write_config_1(sc, off + i, s[i]); 527 } 528 } 529 530 static bool 531 vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc) 532 { 533 device_t dev; 534 int rid, table_rid; 535 536 dev = sc->vtpci_dev; 537 538 rid = table_rid = pci_msix_table_bar(dev); 539 if (rid != PCIR_BAR(0)) { 540 sc->vtpci_msix_table_res = bus_alloc_resource_any( 541 dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 542 if (sc->vtpci_msix_table_res == NULL) 543 return (false); 544 } 545 546 rid = pci_msix_pba_bar(dev); 547 if (rid != table_rid && rid != PCIR_BAR(0)) { 548 sc->vtpci_msix_pba_res = bus_alloc_resource_any( 549 dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 550 if (sc->vtpci_msix_pba_res == NULL) 551 return (false); 552 } 553 554 return (true); 555 } 556 557 static void 558 vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc) 559 { 560 device_t dev; 561 562 dev = sc->vtpci_dev; 563 564 if (sc->vtpci_msix_pba_res != NULL) { 565 bus_release_resource(dev, SYS_RES_MEMORY, 566 rman_get_rid(sc->vtpci_msix_pba_res), 567 sc->vtpci_msix_pba_res); 568 sc->vtpci_msix_pba_res = NULL; 569 } 570 if (sc->vtpci_msix_table_res != NULL) { 571 bus_release_resource(dev, SYS_RES_MEMORY, 572 rman_get_rid(sc->vtpci_msix_table_res), 573 sc->vtpci_msix_table_res); 574 sc->vtpci_msix_table_res = NULL; 575 } 576 } 577 578 static int 579 vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *sc) 580 { 581 const int res_types[] = { SYS_RES_IOPORT, SYS_RES_MEMORY }; 582 device_t dev; 583 int rid, i; 584 585 dev = sc->vtpci_dev; 586 587 /* 588 * Most hypervisors export the common configuration structure in IO 589 * space, but some use memory space; try both. 590 */ 591 for (i = 0; nitems(res_types); i++) { 592 rid = PCIR_BAR(0); 593 sc->vtpci_res_type = res_types[i]; 594 sc->vtpci_res = bus_alloc_resource_any(dev, res_types[i], &rid, 595 RF_ACTIVE); 596 if (sc->vtpci_res != NULL) 597 break; 598 } 599 if (sc->vtpci_res == NULL) 600 return (ENXIO); 601 602 return (0); 603 } 604 605 static void 606 vtpci_legacy_free_resources(struct vtpci_legacy_softc *sc) 607 { 608 device_t dev; 609 610 dev = sc->vtpci_dev; 611 612 if (sc->vtpci_res != NULL) { 613 bus_release_resource(dev, sc->vtpci_res_type, PCIR_BAR(0), 614 sc->vtpci_res); 615 sc->vtpci_res = NULL; 616 } 617 } 618 619 static void 620 vtpci_legacy_probe_and_attach_child(struct vtpci_legacy_softc *sc) 621 { 622 device_t dev, child; 623 624 dev = sc->vtpci_dev; 625 child = vtpci_child_device(&sc->vtpci_common); 626 627 if (child == NULL || device_get_state(child) != DS_NOTPRESENT) 628 return; 629 630 if (device_probe(child) != 0) 631 return; 632 633 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER); 634 635 if (device_attach(child) != 0) { 636 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_FAILED); 637 /* Reset status for future attempt. */ 638 vtpci_legacy_child_detached(dev, child); 639 } else { 640 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER_OK); 641 VIRTIO_ATTACH_COMPLETED(child); 642 } 643 } 644 645 static int 646 vtpci_legacy_register_msix(struct vtpci_legacy_softc *sc, int offset, 647 struct vtpci_interrupt *intr) 648 { 649 uint16_t vector; 650 651 if (intr != NULL) { 652 /* Map from guest rid to host vector. */ 653 vector = intr->vti_rid - 1; 654 } else 655 vector = VIRTIO_MSI_NO_VECTOR; 656 657 vtpci_legacy_write_header_2(sc, offset, vector); 658 return (vtpci_legacy_read_header_2(sc, offset) == vector ? 0 : ENODEV); 659 } 660 661 static int 662 vtpci_legacy_register_cfg_msix(device_t dev, struct vtpci_interrupt *intr) 663 { 664 struct vtpci_legacy_softc *sc; 665 int error; 666 667 sc = device_get_softc(dev); 668 669 error = vtpci_legacy_register_msix(sc, VIRTIO_MSI_CONFIG_VECTOR, intr); 670 if (error) { 671 device_printf(dev, 672 "unable to register config MSIX interrupt\n"); 673 return (error); 674 } 675 676 return (0); 677 } 678 679 static int 680 vtpci_legacy_register_vq_msix(device_t dev, int idx, 681 struct vtpci_interrupt *intr) 682 { 683 struct vtpci_legacy_softc *sc; 684 int error; 685 686 sc = device_get_softc(dev); 687 688 vtpci_legacy_select_virtqueue(sc, idx); 689 error = vtpci_legacy_register_msix(sc, VIRTIO_MSI_QUEUE_VECTOR, intr); 690 if (error) { 691 device_printf(dev, 692 "unable to register virtqueue MSIX interrupt\n"); 693 return (error); 694 } 695 696 return (0); 697 } 698 699 static void 700 vtpci_legacy_reset(struct vtpci_legacy_softc *sc) 701 { 702 /* 703 * Setting the status to RESET sets the host device to the 704 * original, uninitialized state. 705 */ 706 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_RESET); 707 (void) vtpci_legacy_get_status(sc); 708 } 709 710 static void 711 vtpci_legacy_select_virtqueue(struct vtpci_legacy_softc *sc, int idx) 712 { 713 vtpci_legacy_write_header_2(sc, VIRTIO_PCI_QUEUE_SEL, idx); 714 } 715 716 static uint8_t 717 vtpci_legacy_read_isr(device_t dev) 718 { 719 struct vtpci_legacy_softc *sc; 720 721 sc = device_get_softc(dev); 722 723 return (vtpci_legacy_read_config_1(sc, VIRTIO_PCI_ISR)); 724 } 725 726 static uint16_t 727 vtpci_legacy_get_vq_size(device_t dev, int idx) 728 { 729 struct vtpci_legacy_softc *sc; 730 731 sc = device_get_softc(dev); 732 733 vtpci_legacy_select_virtqueue(sc, idx); 734 return (vtpci_legacy_read_header_2(sc, VIRTIO_PCI_QUEUE_NUM)); 735 } 736 737 static bus_size_t 738 vtpci_legacy_get_vq_notify_off(device_t dev, int idx) 739 { 740 return (VIRTIO_PCI_QUEUE_NOTIFY); 741 } 742 743 static void 744 vtpci_legacy_set_vq(device_t dev, struct virtqueue *vq) 745 { 746 struct vtpci_legacy_softc *sc; 747 748 sc = device_get_softc(dev); 749 750 vtpci_legacy_select_virtqueue(sc, virtqueue_index(vq)); 751 vtpci_legacy_write_header_4(sc, VIRTIO_PCI_QUEUE_PFN, 752 virtqueue_paddr(vq) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT); 753 } 754 755 static void 756 vtpci_legacy_disable_vq(device_t dev, int idx) 757 { 758 struct vtpci_legacy_softc *sc; 759 760 sc = device_get_softc(dev); 761 762 vtpci_legacy_select_virtqueue(sc, idx); 763 vtpci_legacy_write_header_4(sc, VIRTIO_PCI_QUEUE_PFN, 0); 764 } 765