viocon.c revision 1.10
1 /* $NetBSD: viocon.c,v 1.10 2024/08/05 19:13:34 riastradh Exp $ */ 2 /* $OpenBSD: viocon.c,v 1.8 2021/11/05 11:38:29 mpi Exp $ */ 3 4 /* 5 * Copyright (c) 2013-2015 Stefan Fritsch <sf (at) sfritsch.de> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/cdefs.h> 21 __KERNEL_RCSID(0, "$NetBSD: viocon.c,v 1.10 2024/08/05 19:13:34 riastradh Exp $"); 22 23 #include <sys/param.h> 24 #include <sys/types.h> 25 26 #include <sys/bus.h> 27 #include <sys/conf.h> 28 #include <sys/device.h> 29 #include <sys/kauth.h> 30 #include <sys/kernel.h> 31 #include <sys/kmem.h> 32 #include <sys/lwp.h> 33 #include <sys/systm.h> 34 #include <sys/tty.h> 35 36 #include <dev/pci/virtioreg.h> 37 #include <dev/pci/virtiovar.h> 38 39 #include "ioconf.h" 40 41 /* OpenBSD compat shims */ 42 #define ttymalloc(speed) tty_alloc() 43 #define splassert(ipl) __nothing 44 #define virtio_notify(vsc, vq) virtio_enqueue_commit(vsc, vq, -1, true) 45 #define ttwakeupwr(tp) __nothing 46 47 /* features */ 48 #define VIRTIO_CONSOLE_F_SIZE (1ULL<<0) 49 #define VIRTIO_CONSOLE_F_MULTIPORT (1ULL<<1) 50 #define VIRTIO_CONSOLE_F_EMERG_WRITE (1ULL<<2) 51 52 /* config space */ 53 #define VIRTIO_CONSOLE_COLS 0 /* 16 bits */ 54 #define VIRTIO_CONSOLE_ROWS 2 /* 16 bits */ 55 #define VIRTIO_CONSOLE_MAX_NR_PORTS 4 /* 32 bits */ 56 #define VIRTIO_CONSOLE_EMERG_WR 8 /* 32 bits */ 57 58 #define VIOCON_DEBUG 0 59 60 #if VIOCON_DEBUG 61 #define DPRINTF(x...) printf(x) 62 #else 63 #define DPRINTF(x...) 64 #endif 65 66 #define VIRTIO_CONSOLE_FLAG_BITS \ 67 VIRTIO_COMMON_FLAG_BITS \ 68 "b\x00" "SIZE\0" \ 69 "b\x01" "MULTIPORT\0" \ 70 "b\x02" "EMERG_WRITE\0" 71 72 struct virtio_console_control { 73 uint32_t id; /* Port number */ 74 75 #define VIRTIO_CONSOLE_DEVICE_READY 0 76 #define VIRTIO_CONSOLE_PORT_ADD 1 77 #define VIRTIO_CONSOLE_PORT_REMOVE 2 78 #define VIRTIO_CONSOLE_PORT_READY 3 79 #define VIRTIO_CONSOLE_CONSOLE_PORT 4 80 #define VIRTIO_CONSOLE_RESIZE 5 81 #define VIRTIO_CONSOLE_PORT_OPEN 6 82 #define VIRTIO_CONSOLE_PORT_NAME 7 83 uint16_t event; 84 85 uint16_t value; 86 }; 87 88 struct virtio_console_control_resize { 89 /* yes, the order is different than in config space */ 90 uint16_t rows; 91 uint16_t cols; 92 }; 93 94 #define BUFSIZE 128 95 96 #define VIOCONDEV(u,p) makedev(cdevsw_lookup_major(&viocon_cdevsw), \ 97 ((u) << 4) | (p)) 98 #define VIOCONUNIT(x) (minor(x) >> 4) 99 #define VIOCONPORT(x) (minor(x) & 0x0f) 100 101 struct viocon_port { 102 struct viocon_softc *vp_sc; 103 struct virtqueue *vp_rx; 104 struct virtqueue *vp_tx; 105 void *vp_si; 106 struct tty *vp_tty; 107 const char *vp_name; 108 bus_dma_segment_t vp_dmaseg; 109 bus_dmamap_t vp_dmamap; 110 #ifdef NOTYET 111 unsigned int vp_host_open:1; /* XXX needs F_MULTIPORT */ 112 unsigned int vp_guest_open:1; /* XXX needs F_MULTIPORT */ 113 unsigned int vp_is_console:1; /* XXX needs F_MULTIPORT */ 114 #endif 115 unsigned int vp_iflow:1; /* rx flow control */ 116 uint16_t vp_rows; 117 uint16_t vp_cols; 118 u_char *vp_rx_buf; 119 u_char *vp_tx_buf; 120 }; 121 122 struct viocon_softc { 123 struct device *sc_dev; 124 struct virtio_softc *sc_virtio; 125 struct virtqueue *sc_vqs; 126 #define VIOCON_PORT_RX 0 127 #define VIOCON_PORT_TX 1 128 #define VIOCON_PORT_NQS 2 129 130 struct virtqueue *sc_c_vq_rx; 131 struct virtqueue *sc_c_vq_tx; 132 133 unsigned int sc_max_ports; 134 struct viocon_port **sc_ports; 135 }; 136 137 int viocon_match(struct device *, struct cfdata *, void *); 138 void viocon_attach(struct device *, struct device *, void *); 139 int viocon_tx_intr(struct virtqueue *); 140 int viocon_tx_drain(struct viocon_port *, struct virtqueue *vq); 141 int viocon_rx_intr(struct virtqueue *); 142 void viocon_rx_soft(void *); 143 void viocon_rx_fill(struct viocon_port *); 144 int viocon_port_create(struct viocon_softc *, int); 145 void vioconstart(struct tty *); 146 int vioconhwiflow(struct tty *, int); 147 int vioconparam(struct tty *, struct termios *); 148 int vioconopen(dev_t, int, int, struct lwp *); 149 int vioconclose(dev_t, int, int, struct lwp *); 150 int vioconread(dev_t, struct uio *, int); 151 int vioconwrite(dev_t, struct uio *, int); 152 void vioconstop(struct tty *, int); 153 int vioconioctl(dev_t, u_long, void *, int, struct lwp *); 154 struct tty *viocontty(dev_t dev); 155 156 CFATTACH_DECL_NEW(viocon, sizeof(struct viocon_softc), 157 viocon_match, viocon_attach, /*detach*/NULL, /*activate*/NULL); 158 159 const struct cdevsw viocon_cdevsw = { 160 .d_open = vioconopen, 161 .d_close = vioconclose, 162 .d_read = vioconread, 163 .d_write = vioconwrite, 164 .d_ioctl = vioconioctl, 165 .d_stop = vioconstop, 166 .d_tty = viocontty, 167 .d_poll = nopoll, /* XXX */ 168 .d_mmap = nommap, 169 .d_kqfilter = ttykqfilter, 170 .d_discard = nodiscard, 171 .d_flag = D_TTY, 172 }; 173 174 static inline struct viocon_softc * 175 dev2sc(dev_t dev) 176 { 177 return device_lookup_private(&viocon_cd, VIOCONUNIT(dev)); 178 } 179 180 static inline struct viocon_port * 181 dev2port(dev_t dev) 182 { 183 return dev2sc(dev)->sc_ports[VIOCONPORT(dev)]; 184 } 185 186 int viocon_match(struct device *parent, struct cfdata *match, void *aux) 187 { 188 struct virtio_attach_args *va = aux; 189 if (va->sc_childdevid == VIRTIO_DEVICE_ID_CONSOLE) 190 return 1; 191 return 0; 192 } 193 194 void 195 viocon_attach(struct device *parent, struct device *self, void *aux) 196 { 197 struct viocon_softc *sc = device_private(self); 198 struct virtio_softc *vsc = device_private(parent); 199 int maxports = 1; 200 size_t nvqs; 201 202 sc->sc_dev = self; 203 if (virtio_child(vsc) != NULL) { 204 aprint_error(": parent %s already has a child\n", 205 device_xname(parent)); 206 return; 207 } 208 sc->sc_virtio = vsc; 209 sc->sc_max_ports = maxports; 210 nvqs = VIOCON_PORT_NQS * maxports; 211 212 sc->sc_vqs = kmem_zalloc(nvqs * sizeof(sc->sc_vqs[0]), 213 KM_SLEEP); 214 sc->sc_ports = kmem_zalloc(maxports * sizeof(sc->sc_ports[0]), 215 KM_SLEEP); 216 217 virtio_child_attach_start(vsc, self, IPL_TTY, 218 /*req_features*/VIRTIO_CONSOLE_F_SIZE, VIRTIO_CONSOLE_FLAG_BITS); 219 220 DPRINTF("%s: softc: %p\n", __func__, sc); 221 if (viocon_port_create(sc, 0) != 0) { 222 printf("\n%s: viocon_port_create failed\n", __func__); 223 goto err; 224 } 225 226 if (virtio_child_attach_finish(vsc, sc->sc_vqs, nvqs, 227 /*config_change*/NULL, /*req_flags*/0) != 0) 228 goto err; 229 230 viocon_rx_fill(sc->sc_ports[0]); 231 232 return; 233 err: 234 kmem_free(sc->sc_vqs, nvqs * sizeof(sc->sc_vqs[0])); 235 kmem_free(sc->sc_ports, maxports * sizeof(sc->sc_ports[0])); 236 virtio_child_attach_failed(vsc); 237 } 238 239 int 240 viocon_port_create(struct viocon_softc *sc, int portidx) 241 { 242 struct virtio_softc *vsc = sc->sc_virtio; 243 int rxidx, txidx, allocsize, nsegs; 244 char name[6]; 245 struct viocon_port *vp; 246 void *kva; 247 struct tty *tp; 248 249 vp = kmem_zalloc(sizeof(*vp), KM_SLEEP); 250 if (vp == NULL) 251 return ENOMEM; 252 sc->sc_ports[portidx] = vp; 253 vp->vp_sc = sc; 254 DPRINTF("%s: vp: %p\n", __func__, vp); 255 256 rxidx = (portidx * VIOCON_PORT_NQS) + VIOCON_PORT_RX; 257 txidx = (portidx * VIOCON_PORT_NQS) + VIOCON_PORT_TX; 258 259 snprintf(name, sizeof(name), "p%drx", portidx); 260 virtio_init_vq_vqdone(vsc, &sc->sc_vqs[rxidx], rxidx, 261 viocon_rx_intr); 262 if (virtio_alloc_vq(vsc, &sc->sc_vqs[rxidx], BUFSIZE, 1, 263 name) != 0) { 264 printf("\nCan't alloc %s virtqueue\n", name); 265 goto err; 266 } 267 vp->vp_rx = &sc->sc_vqs[rxidx]; 268 vp->vp_si = softint_establish(SOFTINT_SERIAL, viocon_rx_soft, vp); 269 DPRINTF("%s: rx: %p\n", __func__, vp->vp_rx); 270 271 snprintf(name, sizeof(name), "p%dtx", portidx); 272 virtio_init_vq_vqdone(vsc, &sc->sc_vqs[txidx], txidx, 273 viocon_tx_intr); 274 if (virtio_alloc_vq(vsc, &sc->sc_vqs[txidx], BUFSIZE, 1, 275 name) != 0) { 276 printf("\nCan't alloc %s virtqueue\n", name); 277 goto err; 278 } 279 vp->vp_tx = &sc->sc_vqs[txidx]; 280 DPRINTF("%s: tx: %p\n", __func__, vp->vp_tx); 281 282 allocsize = (vp->vp_rx->vq_num + vp->vp_tx->vq_num) * BUFSIZE; 283 284 if (bus_dmamap_create(virtio_dmat(vsc), allocsize, 1, allocsize, 0, 285 BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &vp->vp_dmamap) != 0) 286 goto err; 287 if (bus_dmamem_alloc(virtio_dmat(vsc), allocsize, 8, 0, &vp->vp_dmaseg, 288 1, &nsegs, BUS_DMA_NOWAIT) != 0) 289 goto err; 290 if (bus_dmamem_map(virtio_dmat(vsc), &vp->vp_dmaseg, nsegs, 291 allocsize, &kva, BUS_DMA_NOWAIT) != 0) 292 goto err; 293 memset(kva, 0, allocsize); 294 if (bus_dmamap_load(virtio_dmat(vsc), vp->vp_dmamap, kva, 295 allocsize, NULL, BUS_DMA_NOWAIT) != 0) 296 goto err; 297 vp->vp_rx_buf = (unsigned char *)kva; 298 /* 299 * XXX use only a small circular tx buffer instead of many BUFSIZE buffers? 300 */ 301 vp->vp_tx_buf = vp->vp_rx_buf + vp->vp_rx->vq_num * BUFSIZE; 302 303 if (virtio_features(vsc) & VIRTIO_CONSOLE_F_SIZE) { 304 vp->vp_cols = virtio_read_device_config_2(vsc, 305 VIRTIO_CONSOLE_COLS); 306 vp->vp_rows = virtio_read_device_config_2(vsc, 307 VIRTIO_CONSOLE_ROWS); 308 } 309 310 tp = ttymalloc(1000000); 311 tp->t_oproc = vioconstart; 312 tp->t_param = vioconparam; 313 tp->t_hwiflow = vioconhwiflow; 314 tp->t_dev = VIOCONDEV(device_unit(sc->sc_dev), portidx); 315 vp->vp_tty = tp; 316 DPRINTF("%s: tty: %p\n", __func__, tp); 317 318 virtio_start_vq_intr(vsc, vp->vp_rx); 319 virtio_start_vq_intr(vsc, vp->vp_tx); 320 321 return 0; 322 err: 323 panic("%s failed", __func__); 324 return -1; 325 } 326 327 int 328 viocon_tx_drain(struct viocon_port *vp, struct virtqueue *vq) 329 { 330 struct virtio_softc *vsc = vq->vq_owner; 331 int ndone = 0, len, slot; 332 333 splassert(IPL_TTY); 334 while (virtio_dequeue(vsc, vq, &slot, &len) == 0) { 335 bus_dmamap_sync(virtio_dmat(vsc), vp->vp_dmamap, 336 vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, BUFSIZE, 337 BUS_DMASYNC_POSTWRITE); 338 virtio_dequeue_commit(vsc, vq, slot); 339 ndone++; 340 } 341 return ndone; 342 } 343 344 int 345 viocon_tx_intr(struct virtqueue *vq) 346 { 347 struct virtio_softc *vsc = vq->vq_owner; 348 struct viocon_softc *sc = device_private(virtio_child(vsc)); 349 int ndone = 0; 350 int portidx = (vq->vq_index - 1) / 2; 351 struct viocon_port *vp = sc->sc_ports[portidx]; 352 struct tty *tp = vp->vp_tty; 353 354 splassert(IPL_TTY); 355 ndone = viocon_tx_drain(vp, vq); 356 if (ndone && ISSET(tp->t_state, TS_BUSY)) { 357 CLR(tp->t_state, TS_BUSY); 358 (*tp->t_linesw->l_start)(tp); 359 } 360 361 return 1; 362 } 363 364 void 365 viocon_rx_fill(struct viocon_port *vp) 366 { 367 struct virtqueue *vq = vp->vp_rx; 368 struct virtio_softc *vsc = vp->vp_sc->sc_virtio; 369 int r, slot, ndone = 0; 370 371 while ((r = virtio_enqueue_prep(vsc, vq, &slot)) == 0) { 372 if (virtio_enqueue_reserve(vsc, vq, slot, 1) != 0) 373 break; 374 bus_dmamap_sync(virtio_dmat(vsc), vp->vp_dmamap, slot * BUFSIZE, 375 BUFSIZE, BUS_DMASYNC_PREREAD); 376 virtio_enqueue_p(vsc, vq, slot, vp->vp_dmamap, slot * BUFSIZE, 377 BUFSIZE, 0); 378 virtio_enqueue_commit(vsc, vq, slot, 0); 379 ndone++; 380 } 381 KASSERTMSG(r == 0 || r == EAGAIN, "r=%d", r); 382 if (ndone > 0) 383 virtio_notify(vsc, vq); 384 } 385 386 int 387 viocon_rx_intr(struct virtqueue *vq) 388 { 389 struct virtio_softc *vsc = vq->vq_owner; 390 struct viocon_softc *sc = device_private(virtio_child(vsc)); 391 int portidx = (vq->vq_index - 1) / 2; 392 struct viocon_port *vp = sc->sc_ports[portidx]; 393 394 softint_schedule(vp->vp_si); 395 return 1; 396 } 397 398 void 399 viocon_rx_soft(void *arg) 400 { 401 struct viocon_port *vp = arg; 402 struct virtqueue *vq = vp->vp_rx; 403 struct virtio_softc *vsc = vq->vq_owner; 404 struct tty *tp = vp->vp_tty; 405 int slot, len, i; 406 u_char *p; 407 408 while (!vp->vp_iflow && virtio_dequeue(vsc, vq, &slot, &len) == 0) { 409 bus_dmamap_sync(virtio_dmat(vsc), vp->vp_dmamap, 410 slot * BUFSIZE, BUFSIZE, BUS_DMASYNC_POSTREAD); 411 p = vp->vp_rx_buf + slot * BUFSIZE; 412 for (i = 0; i < len; i++) 413 (*tp->t_linesw->l_rint)(*p++, tp); 414 virtio_dequeue_commit(vsc, vq, slot); 415 } 416 417 viocon_rx_fill(vp); 418 419 return; 420 } 421 422 void 423 vioconstart(struct tty *tp) 424 { 425 struct viocon_softc *sc = dev2sc(tp->t_dev); 426 struct virtio_softc *vsc; 427 struct viocon_port *vp = dev2port(tp->t_dev); 428 struct virtqueue *vq; 429 u_char *buf; 430 int s, cnt, slot, ret, ndone; 431 432 vsc = sc->sc_virtio; 433 vq = vp->vp_tx; 434 435 s = spltty(); 436 437 ndone = viocon_tx_drain(vp, vq); 438 if (ISSET(tp->t_state, TS_BUSY)) { 439 if (ndone > 0) 440 CLR(tp->t_state, TS_BUSY); 441 else 442 goto out; 443 } 444 if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP)) 445 goto out; 446 447 if (tp->t_outq.c_cc == 0) 448 goto out; 449 ndone = 0; 450 451 while (tp->t_outq.c_cc > 0) { 452 ret = virtio_enqueue_prep(vsc, vq, &slot); 453 if (ret == EAGAIN) { 454 SET(tp->t_state, TS_BUSY); 455 break; 456 } 457 KASSERTMSG(ret == 0, "ret=%d", ret); 458 ret = virtio_enqueue_reserve(vsc, vq, slot, 1); 459 KASSERTMSG(ret == 0, "ret=%d", ret); 460 buf = vp->vp_tx_buf + slot * BUFSIZE; 461 cnt = q_to_b(&tp->t_outq, buf, BUFSIZE); 462 bus_dmamap_sync(virtio_dmat(vsc), vp->vp_dmamap, 463 vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, cnt, 464 BUS_DMASYNC_PREWRITE); 465 virtio_enqueue_p(vsc, vq, slot, vp->vp_dmamap, 466 vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, cnt, 1); 467 virtio_enqueue_commit(vsc, vq, slot, 0); 468 ndone++; 469 } 470 if (ndone > 0) 471 virtio_notify(vsc, vq); 472 ttwakeupwr(tp); 473 out: 474 splx(s); 475 } 476 477 int 478 vioconhwiflow(struct tty *tp, int stop) 479 { 480 struct viocon_port *vp = dev2port(tp->t_dev); 481 int s; 482 483 s = spltty(); 484 vp->vp_iflow = stop; 485 if (stop) { 486 virtio_stop_vq_intr(vp->vp_sc->sc_virtio, vp->vp_rx); 487 } else { 488 virtio_start_vq_intr(vp->vp_sc->sc_virtio, vp->vp_rx); 489 softint_schedule(vp->vp_si); 490 } 491 splx(s); 492 return 1; 493 } 494 495 int 496 vioconparam(struct tty *tp, struct termios *t) 497 { 498 tp->t_ispeed = t->c_ispeed; 499 tp->t_ospeed = t->c_ospeed; 500 tp->t_cflag = t->c_cflag; 501 502 vioconstart(tp); 503 return 0; 504 } 505 506 int 507 vioconopen(dev_t dev, int flag, int mode, struct lwp *l) 508 { 509 int unit = VIOCONUNIT(dev); 510 int port = VIOCONPORT(dev); 511 struct viocon_softc *sc; 512 struct viocon_port *vp; 513 struct tty *tp; 514 int s, error; 515 516 sc = device_lookup_private(&viocon_cd, unit); 517 if (sc == NULL) 518 return (ENXIO); 519 if (!device_is_active(sc->sc_dev)) 520 return (ENXIO); 521 522 s = spltty(); 523 if (port >= sc->sc_max_ports) { 524 splx(s); 525 return (ENXIO); 526 } 527 vp = sc->sc_ports[port]; 528 tp = vp->vp_tty; 529 #ifdef NOTYET 530 vp->vp_guest_open = 1; 531 #endif 532 splx(s); 533 534 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 535 return (EBUSY); 536 537 s = spltty(); 538 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 539 ttychars(tp); 540 tp->t_ispeed = 1000000; 541 tp->t_ospeed = 1000000; 542 tp->t_cflag = TTYDEF_CFLAG|CLOCAL|CRTSCTS; 543 tp->t_iflag = TTYDEF_IFLAG; 544 tp->t_oflag = TTYDEF_OFLAG; 545 tp->t_lflag = TTYDEF_LFLAG; 546 if (vp->vp_cols != 0) { 547 tp->t_winsize.ws_col = vp->vp_cols; 548 tp->t_winsize.ws_row = vp->vp_rows; 549 } 550 551 vioconparam(tp, &tp->t_termios); 552 ttsetwater(tp); 553 } 554 splx(s); 555 556 error = (*tp->t_linesw->l_open)(dev, tp); 557 return error; 558 } 559 560 int 561 vioconclose(dev_t dev, int flag, int mode, struct lwp *l) 562 { 563 struct viocon_port *vp = dev2port(dev); 564 struct tty *tp = vp->vp_tty; 565 int s; 566 567 if (!ISSET(tp->t_state, TS_ISOPEN)) 568 return 0; 569 570 (*tp->t_linesw->l_close)(tp, flag); 571 s = spltty(); 572 #ifdef NOTYET 573 vp->vp_guest_open = 0; 574 #endif 575 CLR(tp->t_state, TS_BUSY | TS_FLUSH); 576 ttyclose(tp); 577 splx(s); 578 579 return 0; 580 } 581 582 int 583 vioconread(dev_t dev, struct uio *uio, int flag) 584 { 585 struct viocon_port *vp = dev2port(dev); 586 struct tty *tp = vp->vp_tty; 587 588 return (*tp->t_linesw->l_read)(tp, uio, flag); 589 } 590 591 int 592 vioconwrite(dev_t dev, struct uio *uio, int flag) 593 { 594 struct viocon_port *vp = dev2port(dev); 595 struct tty *tp = vp->vp_tty; 596 597 return (*tp->t_linesw->l_write)(tp, uio, flag); 598 } 599 600 struct tty * 601 viocontty(dev_t dev) 602 { 603 struct viocon_port *vp = dev2port(dev); 604 605 return vp->vp_tty; 606 } 607 608 void 609 vioconstop(struct tty *tp, int flag) 610 { 611 int s; 612 613 s = spltty(); 614 if (ISSET(tp->t_state, TS_BUSY)) 615 if (!ISSET(tp->t_state, TS_TTSTOP)) 616 SET(tp->t_state, TS_FLUSH); 617 splx(s); 618 } 619 620 int 621 vioconioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 622 { 623 struct viocon_port *vp = dev2port(dev); 624 struct tty *tp; 625 int error1, error2; 626 627 tp = vp->vp_tty; 628 629 error1 = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 630 if (error1 >= 0) 631 return error1; 632 error2 = ttioctl(tp, cmd, data, flag, l); 633 if (error2 >= 0) 634 return error2; 635 return ENOTTY; 636 } 637
Indexes created Tue Sep 23 07:09:52 GMT 2025