1 /*- 2 * Copyright (c) 2014, Bryan Venteicher <bryanv@FreeBSD.org> 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 unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 /* Driver for VirtIO console devices. */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/ctype.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/module.h> 38 #include <sys/kdb.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/sglist.h> 42 #include <sys/sysctl.h> 43 #include <sys/taskqueue.h> 44 #include <sys/queue.h> 45 46 #include <sys/conf.h> 47 #include <sys/cons.h> 48 #include <sys/tty.h> 49 50 #include <machine/bus.h> 51 #include <machine/resource.h> 52 #include <sys/bus.h> 53 54 #include <dev/virtio/virtio.h> 55 #include <dev/virtio/virtqueue.h> 56 #include <dev/virtio/console/virtio_console.h> 57 58 #include "virtio_if.h" 59 60 #define VTCON_MAX_PORTS 32 61 #define VTCON_TTY_PREFIX "V" 62 #define VTCON_TTY_ALIAS_PREFIX "vtcon" 63 #define VTCON_BULK_BUFSZ 128 64 #define VTCON_CTRL_BUFSZ 128 65 66 /* 67 * The buffers cannot cross more than one page boundary due to the 68 * size of the sglist segment array used. 69 */ 70 CTASSERT(VTCON_BULK_BUFSZ <= PAGE_SIZE); 71 CTASSERT(VTCON_CTRL_BUFSZ <= PAGE_SIZE); 72 73 CTASSERT(sizeof(struct virtio_console_config) <= VTCON_CTRL_BUFSZ); 74 75 struct vtcon_softc; 76 struct vtcon_softc_port; 77 78 struct vtcon_port { 79 struct mtx vtcport_mtx; 80 struct vtcon_softc *vtcport_sc; 81 struct vtcon_softc_port *vtcport_scport; 82 struct tty *vtcport_tty; 83 struct virtqueue *vtcport_invq; 84 struct virtqueue *vtcport_outvq; 85 int vtcport_id; 86 int vtcport_flags; 87 #define VTCON_PORT_FLAG_GONE 0x01 88 #define VTCON_PORT_FLAG_CONSOLE 0x02 89 #define VTCON_PORT_FLAG_ALIAS 0x04 90 91 #if defined(KDB) 92 int vtcport_alt_break_state; 93 #endif 94 }; 95 96 #define VTCON_PORT_LOCK(_port) mtx_lock(&(_port)->vtcport_mtx) 97 #define VTCON_PORT_UNLOCK(_port) mtx_unlock(&(_port)->vtcport_mtx) 98 99 struct vtcon_softc_port { 100 struct vtcon_softc *vcsp_sc; 101 struct vtcon_port *vcsp_port; 102 struct virtqueue *vcsp_invq; 103 struct virtqueue *vcsp_outvq; 104 }; 105 106 struct vtcon_softc { 107 device_t vtcon_dev; 108 struct mtx vtcon_mtx; 109 uint64_t vtcon_features; 110 uint32_t vtcon_max_ports; 111 uint32_t vtcon_flags; 112 #define VTCON_FLAG_DETACHED 0x01 113 #define VTCON_FLAG_SIZE 0x02 114 #define VTCON_FLAG_MULTIPORT 0x04 115 116 /* 117 * Ports can be added and removed during runtime, but we have 118 * to allocate all the virtqueues during attach. This array is 119 * indexed by the port ID. 120 */ 121 struct vtcon_softc_port *vtcon_ports; 122 123 struct task vtcon_ctrl_task; 124 struct virtqueue *vtcon_ctrl_rxvq; 125 struct virtqueue *vtcon_ctrl_txvq; 126 struct mtx vtcon_ctrl_tx_mtx; 127 }; 128 129 #define VTCON_LOCK(_sc) mtx_lock(&(_sc)->vtcon_mtx) 130 #define VTCON_UNLOCK(_sc) mtx_unlock(&(_sc)->vtcon_mtx) 131 #define VTCON_LOCK_ASSERT(_sc) \ 132 mtx_assert(&(_sc)->vtcon_mtx, MA_OWNED) 133 #define VTCON_LOCK_ASSERT_NOTOWNED(_sc) \ 134 mtx_assert(&(_sc)->vtcon_mtx, MA_NOTOWNED) 135 136 #define VTCON_CTRL_TX_LOCK(_sc) mtx_lock(&(_sc)->vtcon_ctrl_tx_mtx) 137 #define VTCON_CTRL_TX_UNLOCK(_sc) mtx_unlock(&(_sc)->vtcon_ctrl_tx_mtx) 138 139 #define VTCON_ASSERT_VALID_PORTID(_sc, _id) \ 140 KASSERT((_id) >= 0 && (_id) < (_sc)->vtcon_max_ports, \ 141 ("%s: port ID %d out of range", __func__, _id)) 142 143 #define VTCON_FEATURES VIRTIO_CONSOLE_F_MULTIPORT 144 145 static struct virtio_feature_desc vtcon_feature_desc[] = { 146 { VIRTIO_CONSOLE_F_SIZE, "ConsoleSize" }, 147 { VIRTIO_CONSOLE_F_MULTIPORT, "MultiplePorts" }, 148 { VIRTIO_CONSOLE_F_EMERG_WRITE, "EmergencyWrite" }, 149 150 { 0, NULL } 151 }; 152 153 static int vtcon_modevent(module_t, int, void *); 154 static void vtcon_drain_all(void); 155 156 static int vtcon_probe(device_t); 157 static int vtcon_attach(device_t); 158 static int vtcon_detach(device_t); 159 static int vtcon_config_change(device_t); 160 161 static void vtcon_setup_features(struct vtcon_softc *); 162 static void vtcon_negotiate_features(struct vtcon_softc *); 163 static int vtcon_alloc_scports(struct vtcon_softc *); 164 static int vtcon_alloc_virtqueues(struct vtcon_softc *); 165 static void vtcon_read_config(struct vtcon_softc *, 166 struct virtio_console_config *); 167 168 static void vtcon_determine_max_ports(struct vtcon_softc *, 169 struct virtio_console_config *); 170 static void vtcon_destroy_ports(struct vtcon_softc *); 171 static void vtcon_stop(struct vtcon_softc *); 172 173 static int vtcon_ctrl_event_enqueue(struct vtcon_softc *, 174 struct virtio_console_control *); 175 static int vtcon_ctrl_event_create(struct vtcon_softc *); 176 static void vtcon_ctrl_event_requeue(struct vtcon_softc *, 177 struct virtio_console_control *); 178 static int vtcon_ctrl_event_populate(struct vtcon_softc *); 179 static void vtcon_ctrl_event_drain(struct vtcon_softc *); 180 static int vtcon_ctrl_init(struct vtcon_softc *); 181 static void vtcon_ctrl_deinit(struct vtcon_softc *); 182 static void vtcon_ctrl_port_add_event(struct vtcon_softc *, int); 183 static void vtcon_ctrl_port_remove_event(struct vtcon_softc *, int); 184 static void vtcon_ctrl_port_console_event(struct vtcon_softc *, int); 185 static void vtcon_ctrl_port_open_event(struct vtcon_softc *, int); 186 static void vtcon_ctrl_port_name_event(struct vtcon_softc *, int, 187 const char *, size_t); 188 static void vtcon_ctrl_process_event(struct vtcon_softc *, 189 struct virtio_console_control *, void *, size_t); 190 static void vtcon_ctrl_task_cb(void *, int); 191 static void vtcon_ctrl_event_intr(void *); 192 static void vtcon_ctrl_poll(struct vtcon_softc *, 193 struct virtio_console_control *control); 194 static void vtcon_ctrl_send_control(struct vtcon_softc *, uint32_t, 195 uint16_t, uint16_t); 196 197 static int vtcon_port_enqueue_buf(struct vtcon_port *, void *, size_t); 198 static int vtcon_port_create_buf(struct vtcon_port *); 199 static void vtcon_port_requeue_buf(struct vtcon_port *, void *); 200 static int vtcon_port_populate(struct vtcon_port *); 201 static void vtcon_port_destroy(struct vtcon_port *); 202 static int vtcon_port_create(struct vtcon_softc *, int); 203 static void vtcon_port_dev_alias(struct vtcon_port *, const char *, 204 size_t); 205 static void vtcon_port_drain_bufs(struct virtqueue *); 206 static void vtcon_port_drain(struct vtcon_port *); 207 static void vtcon_port_teardown(struct vtcon_port *); 208 static void vtcon_port_change_size(struct vtcon_port *, uint16_t, 209 uint16_t); 210 static void vtcon_port_update_console_size(struct vtcon_softc *); 211 static void vtcon_port_enable_intr(struct vtcon_port *); 212 static void vtcon_port_disable_intr(struct vtcon_port *); 213 static void vtcon_port_in(struct vtcon_port *); 214 static void vtcon_port_intr(void *); 215 static void vtcon_port_out(struct vtcon_port *, void *, int); 216 static void vtcon_port_submit_event(struct vtcon_port *, uint16_t, 217 uint16_t); 218 219 static int vtcon_tty_open(struct tty *); 220 static void vtcon_tty_close(struct tty *); 221 static void vtcon_tty_outwakeup(struct tty *); 222 static void vtcon_tty_free(void *); 223 224 static void vtcon_get_console_size(struct vtcon_softc *, uint16_t *, 225 uint16_t *); 226 227 static void vtcon_enable_interrupts(struct vtcon_softc *); 228 static void vtcon_disable_interrupts(struct vtcon_softc *); 229 230 static int vtcon_pending_free; 231 232 static struct ttydevsw vtcon_tty_class = { 233 .tsw_flags = 0, 234 .tsw_open = vtcon_tty_open, 235 .tsw_close = vtcon_tty_close, 236 .tsw_outwakeup = vtcon_tty_outwakeup, 237 .tsw_free = vtcon_tty_free, 238 }; 239 240 static device_method_t vtcon_methods[] = { 241 /* Device methods. */ 242 DEVMETHOD(device_probe, vtcon_probe), 243 DEVMETHOD(device_attach, vtcon_attach), 244 DEVMETHOD(device_detach, vtcon_detach), 245 246 /* VirtIO methods. */ 247 DEVMETHOD(virtio_config_change, vtcon_config_change), 248 249 DEVMETHOD_END 250 }; 251 252 static driver_t vtcon_driver = { 253 "vtcon", 254 vtcon_methods, 255 sizeof(struct vtcon_softc) 256 }; 257 static devclass_t vtcon_devclass; 258 259 DRIVER_MODULE(virtio_console, virtio_pci, vtcon_driver, vtcon_devclass, 260 vtcon_modevent, 0); 261 MODULE_VERSION(virtio_console, 1); 262 MODULE_DEPEND(virtio_console, virtio, 1, 1, 1); 263 264 static int 265 vtcon_modevent(module_t mod, int type, void *unused) 266 { 267 int error; 268 269 switch (type) { 270 case MOD_LOAD: 271 error = 0; 272 break; 273 case MOD_QUIESCE: 274 error = 0; 275 break; 276 case MOD_UNLOAD: 277 vtcon_drain_all(); 278 error = 0; 279 break; 280 case MOD_SHUTDOWN: 281 error = 0; 282 break; 283 default: 284 error = EOPNOTSUPP; 285 break; 286 } 287 288 return (error); 289 } 290 291 static void 292 vtcon_drain_all(void) 293 { 294 int first; 295 296 for (first = 1; vtcon_pending_free != 0; first = 0) { 297 if (first != 0) { 298 printf("virtio_console: Waiting for all detached TTY " 299 "devices to have open fds closed.\n"); 300 } 301 pause("vtcondra", hz); 302 } 303 } 304 305 static int 306 vtcon_probe(device_t dev) 307 { 308 309 if (virtio_get_device_type(dev) != VIRTIO_ID_CONSOLE) 310 return (ENXIO); 311 312 device_set_desc(dev, "VirtIO Console Adapter"); 313 314 return (BUS_PROBE_DEFAULT); 315 } 316 317 static int 318 vtcon_attach(device_t dev) 319 { 320 struct vtcon_softc *sc; 321 struct virtio_console_config concfg; 322 int error; 323 324 sc = device_get_softc(dev); 325 sc->vtcon_dev = dev; 326 327 mtx_init(&sc->vtcon_mtx, "vtconmtx", NULL, MTX_DEF); 328 mtx_init(&sc->vtcon_ctrl_tx_mtx, "vtconctrlmtx", NULL, MTX_DEF); 329 330 virtio_set_feature_desc(dev, vtcon_feature_desc); 331 vtcon_setup_features(sc); 332 333 vtcon_read_config(sc, &concfg); 334 vtcon_determine_max_ports(sc, &concfg); 335 336 error = vtcon_alloc_scports(sc); 337 if (error) { 338 device_printf(dev, "cannot allocate softc port structures\n"); 339 goto fail; 340 } 341 342 error = vtcon_alloc_virtqueues(sc); 343 if (error) { 344 device_printf(dev, "cannot allocate virtqueues\n"); 345 goto fail; 346 } 347 348 if (sc->vtcon_flags & VTCON_FLAG_MULTIPORT) { 349 TASK_INIT(&sc->vtcon_ctrl_task, 0, vtcon_ctrl_task_cb, sc); 350 error = vtcon_ctrl_init(sc); 351 if (error) 352 goto fail; 353 } else { 354 error = vtcon_port_create(sc, 0); 355 if (error) 356 goto fail; 357 if (sc->vtcon_flags & VTCON_FLAG_SIZE) 358 vtcon_port_update_console_size(sc); 359 } 360 361 error = virtio_setup_intr(dev, INTR_TYPE_TTY); 362 if (error) { 363 device_printf(dev, "cannot setup virtqueue interrupts\n"); 364 goto fail; 365 } 366 367 vtcon_enable_interrupts(sc); 368 369 vtcon_ctrl_send_control(sc, VIRTIO_CONSOLE_BAD_ID, 370 VIRTIO_CONSOLE_DEVICE_READY, 1); 371 372 fail: 373 if (error) 374 vtcon_detach(dev); 375 376 return (error); 377 } 378 379 static int 380 vtcon_detach(device_t dev) 381 { 382 struct vtcon_softc *sc; 383 384 sc = device_get_softc(dev); 385 386 VTCON_LOCK(sc); 387 sc->vtcon_flags |= VTCON_FLAG_DETACHED; 388 if (device_is_attached(dev)) 389 vtcon_stop(sc); 390 VTCON_UNLOCK(sc); 391 392 if (sc->vtcon_flags & VTCON_FLAG_MULTIPORT) { 393 taskqueue_drain(taskqueue_thread, &sc->vtcon_ctrl_task); 394 vtcon_ctrl_deinit(sc); 395 } 396 397 vtcon_destroy_ports(sc); 398 mtx_destroy(&sc->vtcon_mtx); 399 mtx_destroy(&sc->vtcon_ctrl_tx_mtx); 400 401 return (0); 402 } 403 404 static int 405 vtcon_config_change(device_t dev) 406 { 407 struct vtcon_softc *sc; 408 409 sc = device_get_softc(dev); 410 411 /* 412 * When the multiport feature is negotiated, all configuration 413 * changes are done through control virtqueue events. 414 */ 415 if ((sc->vtcon_flags & VTCON_FLAG_MULTIPORT) == 0) { 416 if (sc->vtcon_flags & VTCON_FLAG_SIZE) 417 vtcon_port_update_console_size(sc); 418 } 419 420 return (0); 421 } 422 423 static void 424 vtcon_negotiate_features(struct vtcon_softc *sc) 425 { 426 device_t dev; 427 uint64_t features; 428 429 dev = sc->vtcon_dev; 430 features = VTCON_FEATURES; 431 432 sc->vtcon_features = virtio_negotiate_features(dev, features); 433 } 434 435 static void 436 vtcon_setup_features(struct vtcon_softc *sc) 437 { 438 device_t dev; 439 440 dev = sc->vtcon_dev; 441 442 vtcon_negotiate_features(sc); 443 444 if (virtio_with_feature(dev, VIRTIO_CONSOLE_F_SIZE)) 445 sc->vtcon_flags |= VTCON_FLAG_SIZE; 446 if (virtio_with_feature(dev, VIRTIO_CONSOLE_F_MULTIPORT)) 447 sc->vtcon_flags |= VTCON_FLAG_MULTIPORT; 448 } 449 450 #define VTCON_GET_CONFIG(_dev, _feature, _field, _cfg) \ 451 if (virtio_with_feature(_dev, _feature)) { \ 452 virtio_read_device_config(_dev, \ 453 offsetof(struct virtio_console_config, _field), \ 454 &(_cfg)->_field, sizeof((_cfg)->_field)); \ 455 } 456 457 static void 458 vtcon_read_config(struct vtcon_softc *sc, struct virtio_console_config *concfg) 459 { 460 device_t dev; 461 462 dev = sc->vtcon_dev; 463 464 bzero(concfg, sizeof(struct virtio_console_config)); 465 466 VTCON_GET_CONFIG(dev, VIRTIO_CONSOLE_F_SIZE, cols, concfg); 467 VTCON_GET_CONFIG(dev, VIRTIO_CONSOLE_F_SIZE, rows, concfg); 468 VTCON_GET_CONFIG(dev, VIRTIO_CONSOLE_F_MULTIPORT, max_nr_ports, concfg); 469 } 470 471 #undef VTCON_GET_CONFIG 472 473 static int 474 vtcon_alloc_scports(struct vtcon_softc *sc) 475 { 476 struct vtcon_softc_port *scport; 477 int max, i; 478 479 max = sc->vtcon_max_ports; 480 481 sc->vtcon_ports = malloc(sizeof(struct vtcon_softc_port) * max, 482 M_DEVBUF, M_NOWAIT | M_ZERO); 483 if (sc->vtcon_ports == NULL) 484 return (ENOMEM); 485 486 for (i = 0; i < max; i++) { 487 scport = &sc->vtcon_ports[i]; 488 scport->vcsp_sc = sc; 489 } 490 491 return (0); 492 } 493 494 static int 495 vtcon_alloc_virtqueues(struct vtcon_softc *sc) 496 { 497 device_t dev; 498 struct vq_alloc_info *info; 499 struct vtcon_softc_port *scport; 500 int i, idx, portidx, nvqs, error; 501 502 dev = sc->vtcon_dev; 503 504 nvqs = sc->vtcon_max_ports * 2; 505 if (sc->vtcon_flags & VTCON_FLAG_MULTIPORT) 506 nvqs += 2; 507 508 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT); 509 if (info == NULL) 510 return (ENOMEM); 511 512 for (i = 0, idx = 0, portidx = 0; i < nvqs / 2; i++, idx += 2) { 513 514 if (i == 1) { 515 /* The control virtqueues are after the first port. */ 516 VQ_ALLOC_INFO_INIT(&info[idx], 0, 517 vtcon_ctrl_event_intr, sc, &sc->vtcon_ctrl_rxvq, 518 "%s-control rx", device_get_nameunit(dev)); 519 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, 520 NULL, sc, &sc->vtcon_ctrl_txvq, 521 "%s-control tx", device_get_nameunit(dev)); 522 continue; 523 } 524 525 scport = &sc->vtcon_ports[portidx]; 526 527 VQ_ALLOC_INFO_INIT(&info[idx], 0, vtcon_port_intr, 528 scport, &scport->vcsp_invq, "%s-port%d in", 529 device_get_nameunit(dev), i); 530 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, 531 NULL, &scport->vcsp_outvq, "%s-port%d out", 532 device_get_nameunit(dev), i); 533 534 portidx++; 535 } 536 537 error = virtio_alloc_virtqueues(dev, 0, nvqs, info); 538 free(info, M_TEMP); 539 540 return (error); 541 } 542 543 static void 544 vtcon_determine_max_ports(struct vtcon_softc *sc, 545 struct virtio_console_config *concfg) 546 { 547 548 if (sc->vtcon_flags & VTCON_FLAG_MULTIPORT) { 549 sc->vtcon_max_ports = 550 min(concfg->max_nr_ports, VTCON_MAX_PORTS); 551 if (sc->vtcon_max_ports == 0) 552 sc->vtcon_max_ports = 1; 553 } else 554 sc->vtcon_max_ports = 1; 555 } 556 557 static void 558 vtcon_destroy_ports(struct vtcon_softc *sc) 559 { 560 struct vtcon_softc_port *scport; 561 struct vtcon_port *port; 562 struct virtqueue *vq; 563 int i; 564 565 if (sc->vtcon_ports == NULL) 566 return; 567 568 VTCON_LOCK(sc); 569 for (i = 0; i < sc->vtcon_max_ports; i++) { 570 scport = &sc->vtcon_ports[i]; 571 572 port = scport->vcsp_port; 573 if (port != NULL) { 574 scport->vcsp_port = NULL; 575 VTCON_PORT_LOCK(port); 576 VTCON_UNLOCK(sc); 577 vtcon_port_teardown(port); 578 VTCON_LOCK(sc); 579 } 580 581 vq = scport->vcsp_invq; 582 if (vq != NULL) 583 vtcon_port_drain_bufs(vq); 584 } 585 VTCON_UNLOCK(sc); 586 587 free(sc->vtcon_ports, M_DEVBUF); 588 sc->vtcon_ports = NULL; 589 } 590 591 static void 592 vtcon_stop(struct vtcon_softc *sc) 593 { 594 595 vtcon_disable_interrupts(sc); 596 virtio_stop(sc->vtcon_dev); 597 } 598 599 static int 600 vtcon_ctrl_event_enqueue(struct vtcon_softc *sc, 601 struct virtio_console_control *control) 602 { 603 struct sglist_seg segs[2]; 604 struct sglist sg; 605 struct virtqueue *vq; 606 int error; 607 608 vq = sc->vtcon_ctrl_rxvq; 609 610 sglist_init(&sg, 2, segs); 611 error = sglist_append(&sg, control, VTCON_CTRL_BUFSZ); 612 KASSERT(error == 0, ("%s: error %d adding control to sglist", 613 __func__, error)); 614 615 return (virtqueue_enqueue(vq, control, &sg, 0, sg.sg_nseg)); 616 } 617 618 static int 619 vtcon_ctrl_event_create(struct vtcon_softc *sc) 620 { 621 struct virtio_console_control *control; 622 int error; 623 624 control = malloc(VTCON_CTRL_BUFSZ, M_DEVBUF, M_ZERO | M_NOWAIT); 625 if (control == NULL) 626 return (ENOMEM); 627 628 error = vtcon_ctrl_event_enqueue(sc, control); 629 if (error) 630 free(control, M_DEVBUF); 631 632 return (error); 633 } 634 635 static void 636 vtcon_ctrl_event_requeue(struct vtcon_softc *sc, 637 struct virtio_console_control *control) 638 { 639 int error; 640 641 bzero(control, VTCON_CTRL_BUFSZ); 642 643 error = vtcon_ctrl_event_enqueue(sc, control); 644 KASSERT(error == 0, 645 ("%s: cannot requeue control buffer %d", __func__, error)); 646 } 647 648 static int 649 vtcon_ctrl_event_populate(struct vtcon_softc *sc) 650 { 651 struct virtqueue *vq; 652 int nbufs, error; 653 654 vq = sc->vtcon_ctrl_rxvq; 655 error = ENOSPC; 656 657 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 658 error = vtcon_ctrl_event_create(sc); 659 if (error) 660 break; 661 } 662 663 if (nbufs > 0) { 664 virtqueue_notify(vq); 665 error = 0; 666 } 667 668 return (error); 669 } 670 671 static void 672 vtcon_ctrl_event_drain(struct vtcon_softc *sc) 673 { 674 struct virtio_console_control *control; 675 struct virtqueue *vq; 676 int last; 677 678 vq = sc->vtcon_ctrl_rxvq; 679 last = 0; 680 681 if (vq == NULL) 682 return; 683 684 VTCON_LOCK(sc); 685 while ((control = virtqueue_drain(vq, &last)) != NULL) 686 free(control, M_DEVBUF); 687 VTCON_UNLOCK(sc); 688 } 689 690 static int 691 vtcon_ctrl_init(struct vtcon_softc *sc) 692 { 693 int error; 694 695 error = vtcon_ctrl_event_populate(sc); 696 697 return (error); 698 } 699 700 static void 701 vtcon_ctrl_deinit(struct vtcon_softc *sc) 702 { 703 704 vtcon_ctrl_event_drain(sc); 705 } 706 707 static void 708 vtcon_ctrl_port_add_event(struct vtcon_softc *sc, int id) 709 { 710 device_t dev; 711 int error; 712 713 dev = sc->vtcon_dev; 714 715 /* This single thread only way for ports to be created. */ 716 if (sc->vtcon_ports[id].vcsp_port != NULL) { 717 device_printf(dev, "%s: adding port %d, but already exists\n", 718 __func__, id); 719 return; 720 } 721 722 error = vtcon_port_create(sc, id); 723 if (error) { 724 device_printf(dev, "%s: cannot create port %d: %d\n", 725 __func__, id, error); 726 vtcon_ctrl_send_control(sc, id, VIRTIO_CONSOLE_PORT_READY, 0); 727 return; 728 } 729 } 730 731 static void 732 vtcon_ctrl_port_remove_event(struct vtcon_softc *sc, int id) 733 { 734 device_t dev; 735 struct vtcon_softc_port *scport; 736 struct vtcon_port *port; 737 738 dev = sc->vtcon_dev; 739 scport = &sc->vtcon_ports[id]; 740 741 VTCON_LOCK(sc); 742 port = scport->vcsp_port; 743 if (port == NULL) { 744 VTCON_UNLOCK(sc); 745 device_printf(dev, "%s: remove port %d, but does not exist\n", 746 __func__, id); 747 return; 748 } 749 750 scport->vcsp_port = NULL; 751 VTCON_PORT_LOCK(port); 752 VTCON_UNLOCK(sc); 753 vtcon_port_teardown(port); 754 } 755 756 static void 757 vtcon_ctrl_port_console_event(struct vtcon_softc *sc, int id) 758 { 759 device_t dev; 760 struct vtcon_softc_port *scport; 761 struct vtcon_port *port; 762 763 dev = sc->vtcon_dev; 764 scport = &sc->vtcon_ports[id]; 765 766 VTCON_LOCK(sc); 767 port = scport->vcsp_port; 768 if (port == NULL) { 769 VTCON_UNLOCK(sc); 770 device_printf(dev, "%s: console port %d, but does not exist\n", 771 __func__, id); 772 return; 773 } 774 775 VTCON_PORT_LOCK(port); 776 VTCON_UNLOCK(sc); 777 port->vtcport_flags |= VTCON_PORT_FLAG_CONSOLE; 778 vtcon_port_submit_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1); 779 VTCON_PORT_UNLOCK(port); 780 } 781 782 static void 783 vtcon_ctrl_port_open_event(struct vtcon_softc *sc, int id) 784 { 785 device_t dev; 786 struct vtcon_softc_port *scport; 787 struct vtcon_port *port; 788 789 dev = sc->vtcon_dev; 790 scport = &sc->vtcon_ports[id]; 791 792 VTCON_LOCK(sc); 793 port = scport->vcsp_port; 794 if (port == NULL) { 795 VTCON_UNLOCK(sc); 796 device_printf(dev, "%s: open port %d, but does not exist\n", 797 __func__, id); 798 return; 799 } 800 801 VTCON_PORT_LOCK(port); 802 VTCON_UNLOCK(sc); 803 vtcon_port_enable_intr(port); 804 VTCON_PORT_UNLOCK(port); 805 } 806 807 static void 808 vtcon_ctrl_port_name_event(struct vtcon_softc *sc, int id, const char *name, 809 size_t len) 810 { 811 device_t dev; 812 struct vtcon_softc_port *scport; 813 struct vtcon_port *port; 814 815 dev = sc->vtcon_dev; 816 scport = &sc->vtcon_ports[id]; 817 818 /* 819 * The VirtIO specification says the NUL terminator is not included in 820 * the length, but QEMU includes it. Adjust the length if needed. 821 */ 822 if (name == NULL || len == 0) 823 return; 824 if (name[len - 1] == '\0') { 825 len--; 826 if (len == 0) 827 return; 828 } 829 830 VTCON_LOCK(sc); 831 port = scport->vcsp_port; 832 if (port == NULL) { 833 VTCON_UNLOCK(sc); 834 device_printf(dev, "%s: name port %d, but does not exist\n", 835 __func__, id); 836 return; 837 } 838 839 VTCON_PORT_LOCK(port); 840 VTCON_UNLOCK(sc); 841 vtcon_port_dev_alias(port, name, len); 842 VTCON_PORT_UNLOCK(port); 843 } 844 845 static void 846 vtcon_ctrl_process_event(struct vtcon_softc *sc, 847 struct virtio_console_control *control, void *data, size_t data_len) 848 { 849 device_t dev; 850 int id; 851 852 dev = sc->vtcon_dev; 853 id = control->id; 854 855 if (id < 0 || id >= sc->vtcon_max_ports) { 856 device_printf(dev, "%s: invalid port ID %d\n", __func__, id); 857 return; 858 } 859 860 switch (control->event) { 861 case VIRTIO_CONSOLE_PORT_ADD: 862 vtcon_ctrl_port_add_event(sc, id); 863 break; 864 865 case VIRTIO_CONSOLE_PORT_REMOVE: 866 vtcon_ctrl_port_remove_event(sc, id); 867 break; 868 869 case VIRTIO_CONSOLE_CONSOLE_PORT: 870 vtcon_ctrl_port_console_event(sc, id); 871 break; 872 873 case VIRTIO_CONSOLE_RESIZE: 874 break; 875 876 case VIRTIO_CONSOLE_PORT_OPEN: 877 vtcon_ctrl_port_open_event(sc, id); 878 break; 879 880 case VIRTIO_CONSOLE_PORT_NAME: 881 vtcon_ctrl_port_name_event(sc, id, (const char *)data, data_len); 882 break; 883 } 884 } 885 886 static void 887 vtcon_ctrl_task_cb(void *xsc, int pending) 888 { 889 struct vtcon_softc *sc; 890 struct virtqueue *vq; 891 struct virtio_console_control *control; 892 void *data; 893 size_t data_len; 894 int detached; 895 uint32_t len; 896 897 sc = xsc; 898 vq = sc->vtcon_ctrl_rxvq; 899 900 VTCON_LOCK(sc); 901 902 while ((detached = (sc->vtcon_flags & VTCON_FLAG_DETACHED)) == 0) { 903 control = virtqueue_dequeue(vq, &len); 904 if (control == NULL) 905 break; 906 907 if (len > sizeof(struct virtio_console_control)) { 908 data = (void *) &control[1]; 909 data_len = len - sizeof(struct virtio_console_control); 910 } else { 911 data = NULL; 912 data_len = 0; 913 } 914 915 VTCON_UNLOCK(sc); 916 vtcon_ctrl_process_event(sc, control, data, data_len); 917 VTCON_LOCK(sc); 918 vtcon_ctrl_event_requeue(sc, control); 919 } 920 921 if (!detached) { 922 virtqueue_notify(vq); 923 if (virtqueue_enable_intr(vq) != 0) 924 taskqueue_enqueue(taskqueue_thread, 925 &sc->vtcon_ctrl_task); 926 } 927 928 VTCON_UNLOCK(sc); 929 } 930 931 static void 932 vtcon_ctrl_event_intr(void *xsc) 933 { 934 struct vtcon_softc *sc; 935 936 sc = xsc; 937 938 /* 939 * Only some events require us to potentially block, but it 940 * easier to just defer all event handling to the taskqueue. 941 */ 942 taskqueue_enqueue(taskqueue_thread, &sc->vtcon_ctrl_task); 943 } 944 945 static void 946 vtcon_ctrl_poll(struct vtcon_softc *sc, 947 struct virtio_console_control *control) 948 { 949 struct sglist_seg segs[2]; 950 struct sglist sg; 951 struct virtqueue *vq; 952 int error; 953 954 vq = sc->vtcon_ctrl_txvq; 955 956 sglist_init(&sg, 2, segs); 957 error = sglist_append(&sg, control, 958 sizeof(struct virtio_console_control)); 959 KASSERT(error == 0, ("%s: error %d adding control to sglist", 960 __func__, error)); 961 962 /* 963 * We cannot use the softc lock to serialize access to this 964 * virtqueue since this is called from the tty layer with the 965 * port lock held. Acquiring the softc would violate our lock 966 * ordering. 967 */ 968 VTCON_CTRL_TX_LOCK(sc); 969 KASSERT(virtqueue_empty(vq), 970 ("%s: virtqueue is not emtpy", __func__)); 971 error = virtqueue_enqueue(vq, control, &sg, sg.sg_nseg, 0); 972 if (error == 0) { 973 virtqueue_notify(vq); 974 virtqueue_poll(vq, NULL); 975 } 976 VTCON_CTRL_TX_UNLOCK(sc); 977 } 978 979 static void 980 vtcon_ctrl_send_control(struct vtcon_softc *sc, uint32_t portid, 981 uint16_t event, uint16_t value) 982 { 983 struct virtio_console_control control; 984 985 if ((sc->vtcon_flags & VTCON_FLAG_MULTIPORT) == 0) 986 return; 987 988 control.id = portid; 989 control.event = event; 990 control.value = value; 991 992 vtcon_ctrl_poll(sc, &control); 993 } 994 995 static int 996 vtcon_port_enqueue_buf(struct vtcon_port *port, void *buf, size_t len) 997 { 998 struct sglist_seg segs[2]; 999 struct sglist sg; 1000 struct virtqueue *vq; 1001 int error; 1002 1003 vq = port->vtcport_invq; 1004 1005 sglist_init(&sg, 2, segs); 1006 error = sglist_append(&sg, buf, len); 1007 KASSERT(error == 0, 1008 ("%s: error %d adding buffer to sglist", __func__, error)); 1009 1010 error = virtqueue_enqueue(vq, buf, &sg, 0, sg.sg_nseg); 1011 1012 return (error); 1013 } 1014 1015 static int 1016 vtcon_port_create_buf(struct vtcon_port *port) 1017 { 1018 void *buf; 1019 int error; 1020 1021 buf = malloc(VTCON_BULK_BUFSZ, M_DEVBUF, M_ZERO | M_NOWAIT); 1022 if (buf == NULL) 1023 return (ENOMEM); 1024 1025 error = vtcon_port_enqueue_buf(port, buf, VTCON_BULK_BUFSZ); 1026 if (error) 1027 free(buf, M_DEVBUF); 1028 1029 return (error); 1030 } 1031 1032 static void 1033 vtcon_port_requeue_buf(struct vtcon_port *port, void *buf) 1034 { 1035 int error; 1036 1037 error = vtcon_port_enqueue_buf(port, buf, VTCON_BULK_BUFSZ); 1038 KASSERT(error == 0, 1039 ("%s: cannot requeue input buffer %d", __func__, error)); 1040 } 1041 1042 static int 1043 vtcon_port_populate(struct vtcon_port *port) 1044 { 1045 struct virtqueue *vq; 1046 int nbufs, error; 1047 1048 vq = port->vtcport_invq; 1049 error = ENOSPC; 1050 1051 for (nbufs = 0; !virtqueue_full(vq); nbufs++) { 1052 error = vtcon_port_create_buf(port); 1053 if (error) 1054 break; 1055 } 1056 1057 if (nbufs > 0) { 1058 virtqueue_notify(vq); 1059 error = 0; 1060 } 1061 1062 return (error); 1063 } 1064 1065 static void 1066 vtcon_port_destroy(struct vtcon_port *port) 1067 { 1068 1069 port->vtcport_sc = NULL; 1070 port->vtcport_scport = NULL; 1071 port->vtcport_invq = NULL; 1072 port->vtcport_outvq = NULL; 1073 port->vtcport_id = -1; 1074 mtx_destroy(&port->vtcport_mtx); 1075 free(port, M_DEVBUF); 1076 } 1077 1078 static int 1079 vtcon_port_init_vqs(struct vtcon_port *port) 1080 { 1081 struct vtcon_softc_port *scport; 1082 int error; 1083 1084 scport = port->vtcport_scport; 1085 1086 port->vtcport_invq = scport->vcsp_invq; 1087 port->vtcport_outvq = scport->vcsp_outvq; 1088 1089 /* 1090 * Free any data left over from when this virtqueue was in use by a 1091 * prior port. We have not yet notified the host that the port is 1092 * ready, so assume nothing in the virtqueue can be for us. 1093 */ 1094 vtcon_port_drain(port); 1095 1096 KASSERT(virtqueue_empty(port->vtcport_invq), 1097 ("%s: in virtqueue is not empty", __func__)); 1098 KASSERT(virtqueue_empty(port->vtcport_outvq), 1099 ("%s: out virtqueue is not empty", __func__)); 1100 1101 error = vtcon_port_populate(port); 1102 if (error) 1103 return (error); 1104 1105 return (0); 1106 } 1107 1108 static int 1109 vtcon_port_create(struct vtcon_softc *sc, int id) 1110 { 1111 device_t dev; 1112 struct vtcon_softc_port *scport; 1113 struct vtcon_port *port; 1114 int error; 1115 1116 dev = sc->vtcon_dev; 1117 scport = &sc->vtcon_ports[id]; 1118 1119 VTCON_ASSERT_VALID_PORTID(sc, id); 1120 MPASS(scport->vcsp_port == NULL); 1121 1122 port = malloc(sizeof(struct vtcon_port), M_DEVBUF, M_NOWAIT | M_ZERO); 1123 if (port == NULL) 1124 return (ENOMEM); 1125 1126 port->vtcport_sc = sc; 1127 port->vtcport_scport = scport; 1128 port->vtcport_id = id; 1129 mtx_init(&port->vtcport_mtx, "vtcpmtx", NULL, MTX_DEF); 1130 port->vtcport_tty = tty_alloc_mutex(&vtcon_tty_class, port, 1131 &port->vtcport_mtx); 1132 1133 error = vtcon_port_init_vqs(port); 1134 if (error) { 1135 VTCON_PORT_LOCK(port); 1136 vtcon_port_teardown(port); 1137 return (error); 1138 } 1139 1140 VTCON_LOCK(sc); 1141 VTCON_PORT_LOCK(port); 1142 scport->vcsp_port = port; 1143 vtcon_port_enable_intr(port); 1144 vtcon_port_submit_event(port, VIRTIO_CONSOLE_PORT_READY, 1); 1145 VTCON_PORT_UNLOCK(port); 1146 VTCON_UNLOCK(sc); 1147 1148 tty_makedev(port->vtcport_tty, NULL, "%s%r.%r", VTCON_TTY_PREFIX, 1149 device_get_unit(dev), id); 1150 1151 return (0); 1152 } 1153 1154 static void 1155 vtcon_port_dev_alias(struct vtcon_port *port, const char *name, size_t len) 1156 { 1157 struct vtcon_softc *sc; 1158 struct cdev *pdev; 1159 struct tty *tp; 1160 int i, error; 1161 1162 sc = port->vtcport_sc; 1163 tp = port->vtcport_tty; 1164 1165 if (port->vtcport_flags & VTCON_PORT_FLAG_ALIAS) 1166 return; 1167 1168 /* Port name is UTF-8, but we can only handle ASCII. */ 1169 for (i = 0; i < len; i++) { 1170 if (!isascii(name[i])) 1171 return; 1172 } 1173 1174 /* 1175 * Port name may not conform to the devfs requirements so we cannot use 1176 * tty_makealias() because the MAKEDEV_CHECKNAME flag must be specified. 1177 */ 1178 error = make_dev_alias_p(MAKEDEV_NOWAIT | MAKEDEV_CHECKNAME, &pdev, 1179 tp->t_dev, "%s/%*s", VTCON_TTY_ALIAS_PREFIX, (int)len, name); 1180 if (error) { 1181 device_printf(sc->vtcon_dev, 1182 "%s: cannot make dev alias (%s/%*s) error %d\n", __func__, 1183 VTCON_TTY_ALIAS_PREFIX, (int)len, name, error); 1184 } else 1185 port->vtcport_flags |= VTCON_PORT_FLAG_ALIAS; 1186 } 1187 1188 static void 1189 vtcon_port_drain_bufs(struct virtqueue *vq) 1190 { 1191 void *buf; 1192 int last; 1193 1194 last = 0; 1195 1196 while ((buf = virtqueue_drain(vq, &last)) != NULL) 1197 free(buf, M_DEVBUF); 1198 } 1199 1200 static void 1201 vtcon_port_drain(struct vtcon_port *port) 1202 { 1203 1204 vtcon_port_drain_bufs(port->vtcport_invq); 1205 } 1206 1207 static void 1208 vtcon_port_teardown(struct vtcon_port *port) 1209 { 1210 struct tty *tp; 1211 1212 tp = port->vtcport_tty; 1213 1214 port->vtcport_flags |= VTCON_PORT_FLAG_GONE; 1215 1216 if (tp != NULL) { 1217 atomic_add_int(&vtcon_pending_free, 1); 1218 tty_rel_gone(tp); 1219 } else 1220 vtcon_port_destroy(port); 1221 } 1222 1223 static void 1224 vtcon_port_change_size(struct vtcon_port *port, uint16_t cols, uint16_t rows) 1225 { 1226 struct tty *tp; 1227 struct winsize sz; 1228 1229 tp = port->vtcport_tty; 1230 1231 if (tp == NULL) 1232 return; 1233 1234 bzero(&sz, sizeof(struct winsize)); 1235 sz.ws_col = cols; 1236 sz.ws_row = rows; 1237 1238 tty_set_winsize(tp, &sz); 1239 } 1240 1241 static void 1242 vtcon_port_update_console_size(struct vtcon_softc *sc) 1243 { 1244 struct vtcon_port *port; 1245 struct vtcon_softc_port *scport; 1246 uint16_t cols, rows; 1247 1248 vtcon_get_console_size(sc, &cols, &rows); 1249 1250 /* 1251 * For now, assume the first (only) port is the console. Note 1252 * QEMU does not implement this feature yet. 1253 */ 1254 scport = &sc->vtcon_ports[0]; 1255 1256 VTCON_LOCK(sc); 1257 port = scport->vcsp_port; 1258 1259 if (port != NULL) { 1260 VTCON_PORT_LOCK(port); 1261 VTCON_UNLOCK(sc); 1262 vtcon_port_change_size(port, cols, rows); 1263 VTCON_PORT_UNLOCK(port); 1264 } else 1265 VTCON_UNLOCK(sc); 1266 } 1267 1268 static void 1269 vtcon_port_enable_intr(struct vtcon_port *port) 1270 { 1271 1272 /* 1273 * NOTE: The out virtqueue is always polled, so its interrupt 1274 * kept disabled. 1275 */ 1276 virtqueue_enable_intr(port->vtcport_invq); 1277 } 1278 1279 static void 1280 vtcon_port_disable_intr(struct vtcon_port *port) 1281 { 1282 1283 if (port->vtcport_invq != NULL) 1284 virtqueue_disable_intr(port->vtcport_invq); 1285 if (port->vtcport_outvq != NULL) 1286 virtqueue_disable_intr(port->vtcport_outvq); 1287 } 1288 1289 static void 1290 vtcon_port_in(struct vtcon_port *port) 1291 { 1292 struct virtqueue *vq; 1293 struct tty *tp; 1294 char *buf; 1295 uint32_t len; 1296 int i, deq; 1297 1298 tp = port->vtcport_tty; 1299 vq = port->vtcport_invq; 1300 1301 again: 1302 deq = 0; 1303 1304 while ((buf = virtqueue_dequeue(vq, &len)) != NULL) { 1305 for (i = 0; i < len; i++) { 1306 #if defined(KDB) 1307 if (port->vtcport_flags & VTCON_PORT_FLAG_CONSOLE) 1308 kdb_alt_break(buf[i], 1309 &port->vtcport_alt_break_state); 1310 #endif 1311 ttydisc_rint(tp, buf[i], 0); 1312 } 1313 vtcon_port_requeue_buf(port, buf); 1314 deq++; 1315 } 1316 ttydisc_rint_done(tp); 1317 1318 if (deq > 0) 1319 virtqueue_notify(vq); 1320 1321 if (virtqueue_enable_intr(vq) != 0) 1322 goto again; 1323 } 1324 1325 static void 1326 vtcon_port_intr(void *scportx) 1327 { 1328 struct vtcon_softc_port *scport; 1329 struct vtcon_softc *sc; 1330 struct vtcon_port *port; 1331 1332 scport = scportx; 1333 sc = scport->vcsp_sc; 1334 1335 VTCON_LOCK(sc); 1336 port = scport->vcsp_port; 1337 if (port == NULL) { 1338 VTCON_UNLOCK(sc); 1339 return; 1340 } 1341 VTCON_PORT_LOCK(port); 1342 VTCON_UNLOCK(sc); 1343 if ((port->vtcport_flags & VTCON_PORT_FLAG_GONE) == 0) 1344 vtcon_port_in(port); 1345 VTCON_PORT_UNLOCK(port); 1346 } 1347 1348 static void 1349 vtcon_port_out(struct vtcon_port *port, void *buf, int bufsize) 1350 { 1351 struct sglist_seg segs[2]; 1352 struct sglist sg; 1353 struct virtqueue *vq; 1354 int error; 1355 1356 vq = port->vtcport_outvq; 1357 KASSERT(virtqueue_empty(vq), 1358 ("%s: port %p out virtqueue not emtpy", __func__, port)); 1359 1360 sglist_init(&sg, 2, segs); 1361 error = sglist_append(&sg, buf, bufsize); 1362 KASSERT(error == 0, ("%s: error %d adding buffer to sglist", 1363 __func__, error)); 1364 1365 error = virtqueue_enqueue(vq, buf, &sg, sg.sg_nseg, 0); 1366 if (error == 0) { 1367 virtqueue_notify(vq); 1368 virtqueue_poll(vq, NULL); 1369 } 1370 } 1371 1372 static void 1373 vtcon_port_submit_event(struct vtcon_port *port, uint16_t event, 1374 uint16_t value) 1375 { 1376 struct vtcon_softc *sc; 1377 1378 sc = port->vtcport_sc; 1379 1380 vtcon_ctrl_send_control(sc, port->vtcport_id, event, value); 1381 } 1382 1383 static int 1384 vtcon_tty_open(struct tty *tp) 1385 { 1386 struct vtcon_port *port; 1387 1388 port = tty_softc(tp); 1389 1390 if (port->vtcport_flags & VTCON_PORT_FLAG_GONE) 1391 return (ENXIO); 1392 1393 vtcon_port_submit_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1); 1394 1395 return (0); 1396 } 1397 1398 static void 1399 vtcon_tty_close(struct tty *tp) 1400 { 1401 struct vtcon_port *port; 1402 1403 port = tty_softc(tp); 1404 1405 if (port->vtcport_flags & VTCON_PORT_FLAG_GONE) 1406 return; 1407 1408 vtcon_port_submit_event(port, VIRTIO_CONSOLE_PORT_OPEN, 0); 1409 } 1410 1411 static void 1412 vtcon_tty_outwakeup(struct tty *tp) 1413 { 1414 struct vtcon_port *port; 1415 char buf[VTCON_BULK_BUFSZ]; 1416 int len; 1417 1418 port = tty_softc(tp); 1419 1420 if (port->vtcport_flags & VTCON_PORT_FLAG_GONE) 1421 return; 1422 1423 while ((len = ttydisc_getc(tp, buf, sizeof(buf))) != 0) 1424 vtcon_port_out(port, buf, len); 1425 } 1426 1427 static void 1428 vtcon_tty_free(void *xport) 1429 { 1430 struct vtcon_port *port; 1431 1432 port = xport; 1433 1434 vtcon_port_destroy(port); 1435 atomic_subtract_int(&vtcon_pending_free, 1); 1436 } 1437 1438 static void 1439 vtcon_get_console_size(struct vtcon_softc *sc, uint16_t *cols, uint16_t *rows) 1440 { 1441 struct virtio_console_config concfg; 1442 1443 KASSERT(sc->vtcon_flags & VTCON_FLAG_SIZE, 1444 ("%s: size feature not negotiated", __func__)); 1445 1446 vtcon_read_config(sc, &concfg); 1447 1448 *cols = concfg.cols; 1449 *rows = concfg.rows; 1450 } 1451 1452 static void 1453 vtcon_enable_interrupts(struct vtcon_softc *sc) 1454 { 1455 struct vtcon_softc_port *scport; 1456 struct vtcon_port *port; 1457 int i; 1458 1459 VTCON_LOCK(sc); 1460 1461 if (sc->vtcon_flags & VTCON_FLAG_MULTIPORT) 1462 virtqueue_enable_intr(sc->vtcon_ctrl_rxvq); 1463 1464 for (i = 0; i < sc->vtcon_max_ports; i++) { 1465 scport = &sc->vtcon_ports[i]; 1466 1467 port = scport->vcsp_port; 1468 if (port == NULL) 1469 continue; 1470 1471 VTCON_PORT_LOCK(port); 1472 vtcon_port_enable_intr(port); 1473 VTCON_PORT_UNLOCK(port); 1474 } 1475 1476 VTCON_UNLOCK(sc); 1477 } 1478 1479 static void 1480 vtcon_disable_interrupts(struct vtcon_softc *sc) 1481 { 1482 struct vtcon_softc_port *scport; 1483 struct vtcon_port *port; 1484 int i; 1485 1486 VTCON_LOCK_ASSERT(sc); 1487 1488 if (sc->vtcon_flags & VTCON_FLAG_MULTIPORT) 1489 virtqueue_disable_intr(sc->vtcon_ctrl_rxvq); 1490 1491 for (i = 0; i < sc->vtcon_max_ports; i++) { 1492 scport = &sc->vtcon_ports[i]; 1493 1494 port = scport->vcsp_port; 1495 if (port == NULL) 1496 continue; 1497 1498 VTCON_PORT_LOCK(port); 1499 vtcon_port_disable_intr(port); 1500 VTCON_PORT_UNLOCK(port); 1501 } 1502 } 1503