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FreeBSD/Linux Kernel Cross Reference
sys/dev/virtio/pci/virtio_pci_legacy.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/lock.h> 38 #include <sys/kernel.h> 39 #include <sys/module.h> 40 #include <sys/endian.h> 41 42 #include <machine/bus.h> 43 #include <machine/resource.h> 44 #include <sys/bus.h> 45 #include <sys/rman.h> 46 47 #include <dev/pci/pcivar.h> 48 #include <dev/pci/pcireg.h> 49 50 #include <dev/virtio/virtio.h> 51 #include <dev/virtio/virtqueue.h> 52 #include <dev/virtio/pci/virtio_pci.h> 53 #include <dev/virtio/pci/virtio_pci_legacy_var.h> 54 55 #include "virtio_bus_if.h" 56 #include "virtio_pci_if.h" 57 #include "virtio_if.h" 58 59 struct vtpci_legacy_softc { 60 device_t vtpci_dev; 61 struct vtpci_common vtpci_common; 62 int vtpci_res_type; 63 struct resource *vtpci_res; 64 struct resource *vtpci_msix_table_res; 65 struct resource *vtpci_msix_pba_res; 66 }; 67 68 static int vtpci_legacy_probe(device_t); 69 static int vtpci_legacy_attach(device_t); 70 static int vtpci_legacy_detach(device_t); 71 static int vtpci_legacy_suspend(device_t); 72 static int vtpci_legacy_resume(device_t); 73 static int vtpci_legacy_shutdown(device_t); 74 75 static void vtpci_legacy_driver_added(device_t, driver_t *); 76 static void vtpci_legacy_child_detached(device_t, device_t); 77 static int vtpci_legacy_read_ivar(device_t, device_t, int, uintptr_t *); 78 static int vtpci_legacy_write_ivar(device_t, device_t, int, uintptr_t); 79 80 static uint8_t vtpci_legacy_read_isr(device_t); 81 static uint16_t vtpci_legacy_get_vq_size(device_t, int); 82 static bus_size_t vtpci_legacy_get_vq_notify_off(device_t, int); 83 static void vtpci_legacy_set_vq(device_t, struct virtqueue *); 84 static void vtpci_legacy_disable_vq(device_t, int); 85 static int vtpci_legacy_register_cfg_msix(device_t, 86 struct vtpci_interrupt *); 87 static int vtpci_legacy_register_vq_msix(device_t, int idx, 88 struct vtpci_interrupt *); 89 90 static uint64_t vtpci_legacy_negotiate_features(device_t, uint64_t); 91 static int vtpci_legacy_with_feature(device_t, uint64_t); 92 static int vtpci_legacy_alloc_virtqueues(device_t, int, int, 93 struct vq_alloc_info *); 94 static int vtpci_legacy_setup_interrupts(device_t, enum intr_type); 95 static void vtpci_legacy_stop(device_t); 96 static int vtpci_legacy_reinit(device_t, uint64_t); 97 static void vtpci_legacy_reinit_complete(device_t); 98 static void vtpci_legacy_notify_vq(device_t, uint16_t, bus_size_t); 99 static void vtpci_legacy_read_dev_config(device_t, bus_size_t, void *, int); 100 static void vtpci_legacy_write_dev_config(device_t, bus_size_t, const void *, int); 101 102 static bool vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc); 103 static void vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc); 104 static int vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *); 105 static void vtpci_legacy_free_resources(struct vtpci_legacy_softc *); 106 107 static void vtpci_legacy_probe_and_attach_child(struct vtpci_legacy_softc *); 108 109 static uint8_t vtpci_legacy_get_status(struct vtpci_legacy_softc *); 110 static void vtpci_legacy_set_status(struct vtpci_legacy_softc *, uint8_t); 111 static void vtpci_legacy_select_virtqueue(struct vtpci_legacy_softc *, int); 112 static void vtpci_legacy_reset(struct vtpci_legacy_softc *); 113 114 #define VIRTIO_PCI_LEGACY_CONFIG(_sc) \ 115 VIRTIO_PCI_CONFIG_OFF(vtpci_is_msix_enabled(&(_sc)->vtpci_common)) 116 117 #define vtpci_legacy_read_config_1(sc, o) \ 118 bus_read_1((sc)->vtpci_res, (o)) 119 #define vtpci_legacy_write_config_1(sc, o, v) \ 120 bus_write_1((sc)->vtpci_res, (o), (v)) 121 /* 122 * VirtIO specifies that PCI Configuration area is guest endian. However, 123 * since PCI devices are inherently little-endian, on big-endian systems 124 * the bus layer transparently converts it to BE. For virtio-legacy, this 125 * conversion is undesired, so an extra byte swap is required to fix it. 126 */ 127 #define vtpci_legacy_read_config_2(sc, o) \ 128 le16toh(bus_read_2((sc)->vtpci_res, (o))) 129 #define vtpci_legacy_read_config_4(sc, o) \ 130 le32toh(bus_read_4((sc)->vtpci_res, (o))) 131 #define vtpci_legacy_write_config_2(sc, o, v) \ 132 bus_write_2((sc)->vtpci_res, (o), (htole16(v))) 133 #define vtpci_legacy_write_config_4(sc, o, v) \ 134 bus_write_4((sc)->vtpci_res, (o), (htole32(v))) 135 /* PCI Header LE. On BE systems the bus layer takes care of byte swapping. */ 136 #define vtpci_legacy_read_header_2(sc, o) \ 137 bus_read_2((sc)->vtpci_res, (o)) 138 #define vtpci_legacy_read_header_4(sc, o) \ 139 bus_read_4((sc)->vtpci_res, (o)) 140 #define vtpci_legacy_write_header_2(sc, o, v) \ 141 bus_write_2((sc)->vtpci_res, (o), (v)) 142 #define vtpci_legacy_write_header_4(sc, o, v) \ 143 bus_write_4((sc)->vtpci_res, (o), (v)) 144 145 static device_method_t vtpci_legacy_methods[] = { 146 /* Device interface. */ 147 DEVMETHOD(device_probe, vtpci_legacy_probe), 148 DEVMETHOD(device_attach, vtpci_legacy_attach), 149 DEVMETHOD(device_detach, vtpci_legacy_detach), 150 DEVMETHOD(device_suspend, vtpci_legacy_suspend), 151 DEVMETHOD(device_resume, vtpci_legacy_resume), 152 DEVMETHOD(device_shutdown, vtpci_legacy_shutdown), 153 154 /* Bus interface. */ 155 DEVMETHOD(bus_driver_added, vtpci_legacy_driver_added), 156 DEVMETHOD(bus_child_detached, vtpci_legacy_child_detached), 157 DEVMETHOD(bus_child_pnpinfo, virtio_child_pnpinfo), 158 DEVMETHOD(bus_read_ivar, vtpci_legacy_read_ivar), 159 DEVMETHOD(bus_write_ivar, vtpci_legacy_write_ivar), 160 161 /* VirtIO PCI interface. */ 162 DEVMETHOD(virtio_pci_read_isr, vtpci_legacy_read_isr), 163 DEVMETHOD(virtio_pci_get_vq_size, vtpci_legacy_get_vq_size), 164 DEVMETHOD(virtio_pci_get_vq_notify_off, vtpci_legacy_get_vq_notify_off), 165 DEVMETHOD(virtio_pci_set_vq, vtpci_legacy_set_vq), 166 DEVMETHOD(virtio_pci_disable_vq, vtpci_legacy_disable_vq), 167 DEVMETHOD(virtio_pci_register_cfg_msix, vtpci_legacy_register_cfg_msix), 168 DEVMETHOD(virtio_pci_register_vq_msix, vtpci_legacy_register_vq_msix), 169 170 /* VirtIO bus interface. */ 171 DEVMETHOD(virtio_bus_negotiate_features, vtpci_legacy_negotiate_features), 172 DEVMETHOD(virtio_bus_with_feature, vtpci_legacy_with_feature), 173 DEVMETHOD(virtio_bus_alloc_virtqueues, vtpci_legacy_alloc_virtqueues), 174 DEVMETHOD(virtio_bus_setup_intr, vtpci_legacy_setup_interrupts), 175 DEVMETHOD(virtio_bus_stop, vtpci_legacy_stop), 176 DEVMETHOD(virtio_bus_reinit, vtpci_legacy_reinit), 177 DEVMETHOD(virtio_bus_reinit_complete, vtpci_legacy_reinit_complete), 178 DEVMETHOD(virtio_bus_notify_vq, vtpci_legacy_notify_vq), 179 DEVMETHOD(virtio_bus_read_device_config, vtpci_legacy_read_dev_config), 180 DEVMETHOD(virtio_bus_write_device_config, vtpci_legacy_write_dev_config), 181 182 DEVMETHOD_END 183 }; 184 185 static driver_t vtpci_legacy_driver = { 186 .name = "virtio_pci", 187 .methods = vtpci_legacy_methods, 188 .size = sizeof(struct vtpci_legacy_softc) 189 }; 190 191 DRIVER_MODULE(virtio_pci_legacy, pci, vtpci_legacy_driver, 0, 0); 192 193 static int 194 vtpci_legacy_probe(device_t dev) 195 { 196 char desc[64]; 197 const char *name; 198 199 if (pci_get_vendor(dev) != VIRTIO_PCI_VENDORID) 200 return (ENXIO); 201 202 if (pci_get_device(dev) < VIRTIO_PCI_DEVICEID_MIN || 203 pci_get_device(dev) > VIRTIO_PCI_DEVICEID_LEGACY_MAX) 204 return (ENXIO); 205 206 if (pci_get_revid(dev) != VIRTIO_PCI_ABI_VERSION) 207 return (ENXIO); 208 209 name = virtio_device_name(pci_get_subdevice(dev)); 210 if (name == NULL) 211 name = "Unknown"; 212 213 snprintf(desc, sizeof(desc), "VirtIO PCI (legacy) %s adapter", name); 214 device_set_desc_copy(dev, desc); 215 216 /* Prefer transitional modern VirtIO PCI. */ 217 return (BUS_PROBE_LOW_PRIORITY); 218 } 219 220 static int 221 vtpci_legacy_attach(device_t dev) 222 { 223 struct vtpci_legacy_softc *sc; 224 int error; 225 226 sc = device_get_softc(dev); 227 sc->vtpci_dev = dev; 228 vtpci_init(&sc->vtpci_common, dev, false); 229 230 error = vtpci_legacy_alloc_resources(sc); 231 if (error) { 232 device_printf(dev, "cannot map I/O space nor memory space\n"); 233 return (error); 234 } 235 236 if (vtpci_is_msix_available(&sc->vtpci_common) && 237 !vtpci_legacy_setup_msix(sc)) { 238 device_printf(dev, "cannot setup MSI-x resources\n"); 239 error = ENXIO; 240 goto fail; 241 } 242 243 vtpci_legacy_reset(sc); 244 245 /* Tell the host we've noticed this device. */ 246 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK); 247 248 error = vtpci_add_child(&sc->vtpci_common); 249 if (error) 250 goto fail; 251 252 vtpci_legacy_probe_and_attach_child(sc); 253 254 return (0); 255 256 fail: 257 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_FAILED); 258 vtpci_legacy_detach(dev); 259 260 return (error); 261 } 262 263 static int 264 vtpci_legacy_detach(device_t dev) 265 { 266 struct vtpci_legacy_softc *sc; 267 int error; 268 269 sc = device_get_softc(dev); 270 271 error = vtpci_delete_child(&sc->vtpci_common); 272 if (error) 273 return (error); 274 275 vtpci_legacy_reset(sc); 276 vtpci_legacy_teardown_msix(sc); 277 vtpci_legacy_free_resources(sc); 278 279 return (0); 280 } 281 282 static int 283 vtpci_legacy_suspend(device_t dev) 284 { 285 return (bus_generic_suspend(dev)); 286 } 287 288 static int 289 vtpci_legacy_resume(device_t dev) 290 { 291 return (bus_generic_resume(dev)); 292 } 293 294 static int 295 vtpci_legacy_shutdown(device_t dev) 296 { 297 (void) bus_generic_shutdown(dev); 298 /* Forcibly stop the host device. */ 299 vtpci_legacy_stop(dev); 300 301 return (0); 302 } 303 304 static void 305 vtpci_legacy_driver_added(device_t dev, driver_t *driver) 306 { 307 vtpci_legacy_probe_and_attach_child(device_get_softc(dev)); 308 } 309 310 static void 311 vtpci_legacy_child_detached(device_t dev, device_t child) 312 { 313 struct vtpci_legacy_softc *sc; 314 315 sc = device_get_softc(dev); 316 317 vtpci_legacy_reset(sc); 318 vtpci_child_detached(&sc->vtpci_common); 319 320 /* After the reset, retell the host we've noticed this device. */ 321 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK); 322 } 323 324 static int 325 vtpci_legacy_read_ivar(device_t dev, device_t child, int index, 326 uintptr_t *result) 327 { 328 struct vtpci_legacy_softc *sc; 329 struct vtpci_common *cn; 330 331 sc = device_get_softc(dev); 332 cn = &sc->vtpci_common; 333 334 if (vtpci_child_device(cn) != child) 335 return (ENOENT); 336 337 switch (index) { 338 case VIRTIO_IVAR_DEVTYPE: 339 *result = pci_get_subdevice(dev); 340 break; 341 default: 342 return (vtpci_read_ivar(cn, index, result)); 343 } 344 345 return (0); 346 } 347 348 static int 349 vtpci_legacy_write_ivar(device_t dev, device_t child, int index, uintptr_t value) 350 { 351 struct vtpci_legacy_softc *sc; 352 struct vtpci_common *cn; 353 354 sc = device_get_softc(dev); 355 cn = &sc->vtpci_common; 356 357 if (vtpci_child_device(cn) != child) 358 return (ENOENT); 359 360 switch (index) { 361 default: 362 return (vtpci_write_ivar(cn, index, value)); 363 } 364 365 return (0); 366 } 367 368 static uint64_t 369 vtpci_legacy_negotiate_features(device_t dev, uint64_t child_features) 370 { 371 struct vtpci_legacy_softc *sc; 372 uint64_t host_features, features; 373 374 sc = device_get_softc(dev); 375 host_features = vtpci_legacy_read_header_4(sc, VIRTIO_PCI_HOST_FEATURES); 376 377 features = vtpci_negotiate_features(&sc->vtpci_common, 378 child_features, host_features); 379 vtpci_legacy_write_header_4(sc, VIRTIO_PCI_GUEST_FEATURES, features); 380 381 return (features); 382 } 383 384 static int 385 vtpci_legacy_with_feature(device_t dev, uint64_t feature) 386 { 387 struct vtpci_legacy_softc *sc; 388 389 sc = device_get_softc(dev); 390 391 return (vtpci_with_feature(&sc->vtpci_common, feature)); 392 } 393 394 static int 395 vtpci_legacy_alloc_virtqueues(device_t dev, int flags, int nvqs, 396 struct vq_alloc_info *vq_info) 397 { 398 struct vtpci_legacy_softc *sc; 399 struct vtpci_common *cn; 400 401 sc = device_get_softc(dev); 402 cn = &sc->vtpci_common; 403 404 return (vtpci_alloc_virtqueues(cn, flags, nvqs, vq_info)); 405 } 406 407 static int 408 vtpci_legacy_setup_interrupts(device_t dev, enum intr_type type) 409 { 410 struct vtpci_legacy_softc *sc; 411 412 sc = device_get_softc(dev); 413 414 return (vtpci_setup_interrupts(&sc->vtpci_common, type)); 415 } 416 417 static void 418 vtpci_legacy_stop(device_t dev) 419 { 420 vtpci_legacy_reset(device_get_softc(dev)); 421 } 422 423 static int 424 vtpci_legacy_reinit(device_t dev, uint64_t features) 425 { 426 struct vtpci_legacy_softc *sc; 427 struct vtpci_common *cn; 428 int error; 429 430 sc = device_get_softc(dev); 431 cn = &sc->vtpci_common; 432 433 /* 434 * Redrive the device initialization. This is a bit of an abuse of 435 * the specification, but VirtualBox, QEMU/KVM, and BHyVe seem to 436 * play nice. 437 * 438 * We do not allow the host device to change from what was originally 439 * negotiated beyond what the guest driver changed. MSIX state should 440 * not change, number of virtqueues and their size remain the same, etc. 441 * This will need to be rethought when we want to support migration. 442 */ 443 444 if (vtpci_legacy_get_status(sc) != VIRTIO_CONFIG_STATUS_RESET) 445 vtpci_legacy_stop(dev); 446 447 /* 448 * Quickly drive the status through ACK and DRIVER. The device does 449 * not become usable again until DRIVER_OK in reinit complete. 450 */ 451 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK); 452 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER); 453 454 vtpci_legacy_negotiate_features(dev, features); 455 456 error = vtpci_reinit(cn); 457 if (error) 458 return (error); 459 460 return (0); 461 } 462 463 static void 464 vtpci_legacy_reinit_complete(device_t dev) 465 { 466 struct vtpci_legacy_softc *sc; 467 468 sc = device_get_softc(dev); 469 470 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER_OK); 471 } 472 473 static void 474 vtpci_legacy_notify_vq(device_t dev, uint16_t queue, bus_size_t offset) 475 { 476 struct vtpci_legacy_softc *sc; 477 478 sc = device_get_softc(dev); 479 MPASS(offset == VIRTIO_PCI_QUEUE_NOTIFY); 480 481 vtpci_legacy_write_header_2(sc, offset, queue); 482 } 483 484 static uint8_t 485 vtpci_legacy_get_status(struct vtpci_legacy_softc *sc) 486 { 487 return (vtpci_legacy_read_config_1(sc, VIRTIO_PCI_STATUS)); 488 } 489 490 static void 491 vtpci_legacy_set_status(struct vtpci_legacy_softc *sc, uint8_t status) 492 { 493 if (status != VIRTIO_CONFIG_STATUS_RESET) 494 status |= vtpci_legacy_get_status(sc); 495 496 vtpci_legacy_write_config_1(sc, VIRTIO_PCI_STATUS, status); 497 } 498 499 static void 500 vtpci_legacy_read_dev_config(device_t dev, bus_size_t offset, 501 void *dst, int length) 502 { 503 struct vtpci_legacy_softc *sc; 504 bus_size_t off; 505 uint8_t *d; 506 int i; 507 508 sc = device_get_softc(dev); 509 off = VIRTIO_PCI_LEGACY_CONFIG(sc) + offset; 510 511 d = dst; 512 for (i = 0; i < length; i++) { 513 d[i] = vtpci_legacy_read_config_1(sc, off + i); 514 } 515 } 516 517 static void 518 vtpci_legacy_write_dev_config(device_t dev, bus_size_t offset, 519 const void *src, int length) 520 { 521 struct vtpci_legacy_softc *sc; 522 bus_size_t off; 523 const uint8_t *s; 524 int i; 525 526 sc = device_get_softc(dev); 527 off = VIRTIO_PCI_LEGACY_CONFIG(sc) + offset; 528 529 s = src; 530 for (i = 0; i < length; i++) { 531 vtpci_legacy_write_config_1(sc, off + i, s[i]); 532 } 533 } 534 535 static bool 536 vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc) 537 { 538 device_t dev; 539 int rid, table_rid; 540 541 dev = sc->vtpci_dev; 542 543 rid = table_rid = pci_msix_table_bar(dev); 544 if (rid != PCIR_BAR(0)) { 545 sc->vtpci_msix_table_res = bus_alloc_resource_any( 546 dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 547 if (sc->vtpci_msix_table_res == NULL) 548 return (false); 549 } 550 551 rid = pci_msix_pba_bar(dev); 552 if (rid != table_rid && rid != PCIR_BAR(0)) { 553 sc->vtpci_msix_pba_res = bus_alloc_resource_any( 554 dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 555 if (sc->vtpci_msix_pba_res == NULL) 556 return (false); 557 } 558 559 return (true); 560 } 561 562 static void 563 vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc) 564 { 565 device_t dev; 566 567 dev = sc->vtpci_dev; 568 569 if (sc->vtpci_msix_pba_res != NULL) { 570 bus_release_resource(dev, SYS_RES_MEMORY, 571 rman_get_rid(sc->vtpci_msix_pba_res), 572 sc->vtpci_msix_pba_res); 573 sc->vtpci_msix_pba_res = NULL; 574 } 575 if (sc->vtpci_msix_table_res != NULL) { 576 bus_release_resource(dev, SYS_RES_MEMORY, 577 rman_get_rid(sc->vtpci_msix_table_res), 578 sc->vtpci_msix_table_res); 579 sc->vtpci_msix_table_res = NULL; 580 } 581 } 582 583 static int 584 vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *sc) 585 { 586 const int res_types[] = { SYS_RES_IOPORT, SYS_RES_MEMORY }; 587 device_t dev; 588 int rid, i; 589 590 dev = sc->vtpci_dev; 591 592 /* 593 * Most hypervisors export the common configuration structure in IO 594 * space, but some use memory space; try both. 595 */ 596 for (i = 0; nitems(res_types); i++) { 597 rid = PCIR_BAR(0); 598 sc->vtpci_res_type = res_types[i]; 599 sc->vtpci_res = bus_alloc_resource_any(dev, res_types[i], &rid, 600 RF_ACTIVE); 601 if (sc->vtpci_res != NULL) 602 break; 603 } 604 if (sc->vtpci_res == NULL) 605 return (ENXIO); 606 607 return (0); 608 } 609 610 static void 611 vtpci_legacy_free_resources(struct vtpci_legacy_softc *sc) 612 { 613 device_t dev; 614 615 dev = sc->vtpci_dev; 616 617 if (sc->vtpci_res != NULL) { 618 bus_release_resource(dev, sc->vtpci_res_type, PCIR_BAR(0), 619 sc->vtpci_res); 620 sc->vtpci_res = NULL; 621 } 622 } 623 624 static void 625 vtpci_legacy_probe_and_attach_child(struct vtpci_legacy_softc *sc) 626 { 627 device_t dev, child; 628 629 dev = sc->vtpci_dev; 630 child = vtpci_child_device(&sc->vtpci_common); 631 632 if (child == NULL || device_get_state(child) != DS_NOTPRESENT) 633 return; 634 635 if (device_probe(child) != 0) 636 return; 637 638 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER); 639 640 if (device_attach(child) != 0) { 641 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_FAILED); 642 /* Reset status for future attempt. */ 643 vtpci_legacy_child_detached(dev, child); 644 } else { 645 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER_OK); 646 VIRTIO_ATTACH_COMPLETED(child); 647 } 648 } 649 650 static int 651 vtpci_legacy_register_msix(struct vtpci_legacy_softc *sc, int offset, 652 struct vtpci_interrupt *intr) 653 { 654 uint16_t vector; 655 656 if (intr != NULL) { 657 /* Map from guest rid to host vector. */ 658 vector = intr->vti_rid - 1; 659 } else 660 vector = VIRTIO_MSI_NO_VECTOR; 661 662 vtpci_legacy_write_header_2(sc, offset, vector); 663 return (vtpci_legacy_read_header_2(sc, offset) == vector ? 0 : ENODEV); 664 } 665 666 static int 667 vtpci_legacy_register_cfg_msix(device_t dev, struct vtpci_interrupt *intr) 668 { 669 struct vtpci_legacy_softc *sc; 670 int error; 671 672 sc = device_get_softc(dev); 673 674 error = vtpci_legacy_register_msix(sc, VIRTIO_MSI_CONFIG_VECTOR, intr); 675 if (error) { 676 device_printf(dev, 677 "unable to register config MSIX interrupt\n"); 678 return (error); 679 } 680 681 return (0); 682 } 683 684 static int 685 vtpci_legacy_register_vq_msix(device_t dev, int idx, 686 struct vtpci_interrupt *intr) 687 { 688 struct vtpci_legacy_softc *sc; 689 int error; 690 691 sc = device_get_softc(dev); 692 693 vtpci_legacy_select_virtqueue(sc, idx); 694 error = vtpci_legacy_register_msix(sc, VIRTIO_MSI_QUEUE_VECTOR, intr); 695 if (error) { 696 device_printf(dev, 697 "unable to register virtqueue MSIX interrupt\n"); 698 return (error); 699 } 700 701 return (0); 702 } 703 704 static void 705 vtpci_legacy_reset(struct vtpci_legacy_softc *sc) 706 { 707 /* 708 * Setting the status to RESET sets the host device to the 709 * original, uninitialized state. 710 */ 711 vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_RESET); 712 (void) vtpci_legacy_get_status(sc); 713 } 714 715 static void 716 vtpci_legacy_select_virtqueue(struct vtpci_legacy_softc *sc, int idx) 717 { 718 vtpci_legacy_write_header_2(sc, VIRTIO_PCI_QUEUE_SEL, idx); 719 } 720 721 static uint8_t 722 vtpci_legacy_read_isr(device_t dev) 723 { 724 struct vtpci_legacy_softc *sc; 725 726 sc = device_get_softc(dev); 727 728 return (vtpci_legacy_read_config_1(sc, VIRTIO_PCI_ISR)); 729 } 730 731 static uint16_t 732 vtpci_legacy_get_vq_size(device_t dev, int idx) 733 { 734 struct vtpci_legacy_softc *sc; 735 736 sc = device_get_softc(dev); 737 738 vtpci_legacy_select_virtqueue(sc, idx); 739 return (vtpci_legacy_read_header_2(sc, VIRTIO_PCI_QUEUE_NUM)); 740 } 741 742 static bus_size_t 743 vtpci_legacy_get_vq_notify_off(device_t dev, int idx) 744 { 745 return (VIRTIO_PCI_QUEUE_NOTIFY); 746 } 747 748 static void 749 vtpci_legacy_set_vq(device_t dev, struct virtqueue *vq) 750 { 751 struct vtpci_legacy_softc *sc; 752 753 sc = device_get_softc(dev); 754 755 vtpci_legacy_select_virtqueue(sc, virtqueue_index(vq)); 756 vtpci_legacy_write_header_4(sc, VIRTIO_PCI_QUEUE_PFN, 757 virtqueue_paddr(vq) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT); 758 } 759 760 static void 761 vtpci_legacy_disable_vq(device_t dev, int idx) 762 { 763 struct vtpci_legacy_softc *sc; 764 765 sc = device_get_softc(dev); 766 767 vtpci_legacy_select_virtqueue(sc, idx); 768 vtpci_legacy_write_header_4(sc, VIRTIO_PCI_QUEUE_PFN, 0); 769 }
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