xref: /netbsd-src/sys/dev/virtio/viocon.c (revision 7d62b00eb9ad855ffcd7da46b41e23feb5476fac) 
1 /*	$NetBSD: viocon.c,v 1.5 2022/08/13 17:31:32 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@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 1.5 2022/08/13 17:31:32 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 
127 	struct virtqueue        *sc_c_vq_rx;
128 	struct virtqueue        *sc_c_vq_tx;
129 
130 	unsigned int		 sc_max_ports;
131 	struct viocon_port	**sc_ports;
132 };
133 
134 int	viocon_match(struct device *, struct cfdata *, void *);
135 void	viocon_attach(struct device *, struct device *, void *);
136 int	viocon_tx_intr(struct virtqueue *);
137 int	viocon_tx_drain(struct viocon_port *, struct virtqueue *vq);
138 int	viocon_rx_intr(struct virtqueue *);
139 void	viocon_rx_soft(void *);
140 void	viocon_rx_fill(struct viocon_port *);
141 int	viocon_port_create(struct viocon_softc *, int);
142 void	vioconstart(struct tty *);
143 int	vioconhwiflow(struct tty *, int);
144 int	vioconparam(struct tty *, struct termios *);
145 int	vioconopen(dev_t, int, int, struct lwp *);
146 int	vioconclose(dev_t, int, int, struct lwp *);
147 int	vioconread(dev_t, struct uio *, int);
148 int	vioconwrite(dev_t, struct uio *, int);
149 void	vioconstop(struct tty *, int);
150 int	vioconioctl(dev_t, u_long, void *, int, struct lwp *);
151 struct tty	*viocontty(dev_t dev);
152 
153 CFATTACH_DECL_NEW(viocon, sizeof(struct viocon_softc),
154     viocon_match, viocon_attach, /*detach*/NULL, /*activate*/NULL);
155 
156 const struct cdevsw viocon_cdevsw = {
157 	.d_open = vioconopen,
158 	.d_close = vioconclose,
159 	.d_read = vioconread,
160 	.d_write = vioconwrite,
161 	.d_ioctl = vioconioctl,
162 	.d_stop = vioconstop,
163 	.d_tty = viocontty,
164 	.d_poll = nopoll,	/* XXX */
165 	.d_mmap = nommap,
166 	.d_kqfilter = ttykqfilter,
167 	.d_discard = nodiscard,
168 	.d_flag = D_TTY,
169 };
170 
171 static inline struct viocon_softc *
172 dev2sc(dev_t dev)
173 {
174 	return device_lookup_private(&viocon_cd, VIOCONUNIT(dev));
175 }
176 
177 static inline struct viocon_port *
178 dev2port(dev_t dev)
179 {
180 	return dev2sc(dev)->sc_ports[VIOCONPORT(dev)];
181 }
182 
183 int viocon_match(struct device *parent, struct cfdata *match, void *aux)
184 {
185 	struct virtio_attach_args *va = aux;
186 	if (va->sc_childdevid == VIRTIO_DEVICE_ID_CONSOLE)
187 		return 1;
188 	return 0;
189 }
190 
191 void
192 viocon_attach(struct device *parent, struct device *self, void *aux)
193 {
194 	struct viocon_softc *sc = device_private(self);
195 	struct virtio_softc *vsc = device_private(parent);
196 	int maxports = 1;
197 
198 	sc->sc_dev = self;
199 	if (virtio_child(vsc) != NULL) {
200 		aprint_error(": parent %s already has a child\n",
201 		    device_xname(parent));
202 		return;
203 	}
204 	sc->sc_virtio = vsc;
205 	sc->sc_max_ports = maxports;
206 
207 	sc->sc_vqs = kmem_zalloc(2 * (maxports + 1) * sizeof(sc->sc_vqs[0]),
208 	    KM_SLEEP);
209 	sc->sc_ports = kmem_zalloc(maxports * sizeof(sc->sc_ports[0]),
210 	    KM_SLEEP);
211 
212 	virtio_child_attach_start(vsc, self, IPL_TTY, sc->sc_vqs,
213 	    /*config_change*/NULL, virtio_vq_intr,
214 	    /*req_flags*/0, /*req_features*/VIRTIO_CONSOLE_F_SIZE,
215 	    VIRTIO_CONSOLE_FLAG_BITS);
216 
217 	DPRINTF("%s: softc: %p\n", __func__, sc);
218 	if (viocon_port_create(sc, 0) != 0) {
219 		printf("\n%s: viocon_port_create failed\n", __func__);
220 		goto err;
221 	}
222 	viocon_rx_fill(sc->sc_ports[0]);
223 
224 	if (virtio_child_attach_finish(vsc) != 0)
225 		goto err;
226 
227 	return;
228 err:
229 	kmem_free(sc->sc_vqs, 2 * (maxports + 1) * sizeof(sc->sc_vqs[0]));
230 	kmem_free(sc->sc_ports, maxports * sizeof(sc->sc_ports[0]));
231 	virtio_child_attach_failed(vsc);
232 }
233 
234 int
235 viocon_port_create(struct viocon_softc *sc, int portidx)
236 {
237 	struct virtio_softc *vsc = sc->sc_virtio;
238 	int rxidx, txidx, allocsize, nsegs;
239 	char name[6];
240 	struct viocon_port *vp;
241 	void *kva;
242 	struct tty *tp;
243 
244 	vp = kmem_zalloc(sizeof(*vp), KM_SLEEP);
245 	if (vp == NULL)
246 		return ENOMEM;
247 	sc->sc_ports[portidx] = vp;
248 	vp->vp_sc = sc;
249 	DPRINTF("%s: vp: %p\n", __func__, vp);
250 
251 	if (portidx == 0)
252 		rxidx = 0;
253 	else
254 		rxidx = 2 * (portidx + 1);
255 	txidx = rxidx + 1;
256 
257 	snprintf(name, sizeof(name), "p%drx", portidx);
258 	if (virtio_alloc_vq(vsc, &sc->sc_vqs[rxidx], rxidx, BUFSIZE, 1,
259 	    name) != 0) {
260 		printf("\nCan't alloc %s virtqueue\n", name);
261 		goto err;
262 	}
263 	vp->vp_rx = &sc->sc_vqs[rxidx];
264 	vp->vp_rx->vq_done = viocon_rx_intr;
265 	vp->vp_si = softint_establish(SOFTINT_SERIAL, viocon_rx_soft, vp);
266 	DPRINTF("%s: rx: %p\n", __func__, vp->vp_rx);
267 
268 	snprintf(name, sizeof(name), "p%dtx", portidx);
269 	if (virtio_alloc_vq(vsc, &sc->sc_vqs[txidx], txidx, BUFSIZE, 1,
270 	    name) != 0) {
271 		printf("\nCan't alloc %s virtqueue\n", name);
272 		goto err;
273 	}
274 	vp->vp_tx = &sc->sc_vqs[txidx];
275 	vp->vp_tx->vq_done = viocon_tx_intr;
276 	DPRINTF("%s: tx: %p\n", __func__, vp->vp_tx);
277 
278 	allocsize = (vp->vp_rx->vq_num + vp->vp_tx->vq_num) * BUFSIZE;
279 
280 	if (bus_dmamap_create(virtio_dmat(vsc), allocsize, 1, allocsize, 0,
281 	    BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &vp->vp_dmamap) != 0)
282 		goto err;
283 	if (bus_dmamem_alloc(virtio_dmat(vsc), allocsize, 8, 0, &vp->vp_dmaseg,
284 	    1, &nsegs, BUS_DMA_NOWAIT) != 0)
285 		goto err;
286 	if (bus_dmamem_map(virtio_dmat(vsc), &vp->vp_dmaseg, nsegs,
287 	    allocsize, &kva, BUS_DMA_NOWAIT) != 0)
288 		goto err;
289 	memset(kva, 0, allocsize);
290 	if (bus_dmamap_load(virtio_dmat(vsc), vp->vp_dmamap, kva,
291 	    allocsize, NULL, BUS_DMA_NOWAIT) != 0)
292 		goto err;
293 	vp->vp_rx_buf = (unsigned char *)kva;
294 	/*
295 	 * XXX use only a small circular tx buffer instead of many BUFSIZE buffers?
296 	 */
297 	vp->vp_tx_buf = vp->vp_rx_buf + vp->vp_rx->vq_num * BUFSIZE;
298 
299 	if (virtio_features(vsc) & VIRTIO_CONSOLE_F_SIZE) {
300 		vp->vp_cols = virtio_read_device_config_2(vsc,
301 		    VIRTIO_CONSOLE_COLS);
302 		vp->vp_rows = virtio_read_device_config_2(vsc,
303 		    VIRTIO_CONSOLE_ROWS);
304 	}
305 
306 	tp = ttymalloc(1000000);
307 	tp->t_oproc = vioconstart;
308 	tp->t_param = vioconparam;
309 	tp->t_hwiflow = vioconhwiflow;
310 	tp->t_dev = VIOCONDEV(device_unit(sc->sc_dev), portidx);
311 	vp->vp_tty = tp;
312 	DPRINTF("%s: tty: %p\n", __func__, tp);
313 
314 	virtio_start_vq_intr(vsc, vp->vp_rx);
315 	virtio_start_vq_intr(vsc, vp->vp_tx);
316 
317 	return 0;
318 err:
319 	panic("%s failed", __func__);
320 	return -1;
321 }
322 
323 int
324 viocon_tx_drain(struct viocon_port *vp, struct virtqueue *vq)
325 {
326 	struct virtio_softc *vsc = vq->vq_owner;
327 	int ndone = 0, len, slot;
328 
329 	splassert(IPL_TTY);
330 	while (virtio_dequeue(vsc, vq, &slot, &len) == 0) {
331 		bus_dmamap_sync(virtio_dmat(vsc), vp->vp_dmamap,
332 		    vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, BUFSIZE,
333 		    BUS_DMASYNC_POSTWRITE);
334 		virtio_dequeue_commit(vsc, vq, slot);
335 		ndone++;
336 	}
337 	return ndone;
338 }
339 
340 int
341 viocon_tx_intr(struct virtqueue *vq)
342 {
343 	struct virtio_softc *vsc = vq->vq_owner;
344 	struct viocon_softc *sc = device_private(virtio_child(vsc));
345 	int ndone = 0;
346 	int portidx = (vq->vq_index - 1) / 2;
347 	struct viocon_port *vp = sc->sc_ports[portidx];
348 	struct tty *tp = vp->vp_tty;
349 
350 	splassert(IPL_TTY);
351 	ndone = viocon_tx_drain(vp, vq);
352 	if (ndone && ISSET(tp->t_state, TS_BUSY)) {
353 		CLR(tp->t_state, TS_BUSY);
354 		(*tp->t_linesw->l_start)(tp);
355 	}
356 
357 	return 1;
358 }
359 
360 void
361 viocon_rx_fill(struct viocon_port *vp)
362 {
363 	struct virtqueue *vq = vp->vp_rx;
364 	struct virtio_softc *vsc = vp->vp_sc->sc_virtio;
365 	int r, slot, ndone = 0;
366 
367 	while ((r = virtio_enqueue_prep(vsc, vq, &slot)) == 0) {
368 		if (virtio_enqueue_reserve(vsc, vq, slot, 1) != 0)
369 			break;
370 		bus_dmamap_sync(virtio_dmat(vsc), vp->vp_dmamap, slot * BUFSIZE,
371 		    BUFSIZE, BUS_DMASYNC_PREREAD);
372 		virtio_enqueue_p(vsc, vq, slot, vp->vp_dmamap, slot * BUFSIZE,
373 		    BUFSIZE, 0);
374 		virtio_enqueue_commit(vsc, vq, slot, 0);
375 		ndone++;
376 	}
377 	KASSERT(r == 0 || r == EAGAIN);
378 	if (ndone > 0)
379 		virtio_notify(vsc, vq);
380 }
381 
382 int
383 viocon_rx_intr(struct virtqueue *vq)
384 {
385 	struct virtio_softc *vsc = vq->vq_owner;
386 	struct viocon_softc *sc = device_private(virtio_child(vsc));
387 	int portidx = (vq->vq_index - 1) / 2;
388 	struct viocon_port *vp = sc->sc_ports[portidx];
389 
390 	softint_schedule(vp->vp_si);
391 	return 1;
392 }
393 
394 void
395 viocon_rx_soft(void *arg)
396 {
397 	struct viocon_port *vp = arg;
398 	struct virtqueue *vq = vp->vp_rx;
399 	struct virtio_softc *vsc = vq->vq_owner;
400 	struct tty *tp = vp->vp_tty;
401 	int slot, len, i;
402 	u_char *p;
403 
404 	while (!vp->vp_iflow && virtio_dequeue(vsc, vq, &slot, &len) == 0) {
405 		bus_dmamap_sync(virtio_dmat(vsc), vp->vp_dmamap,
406 		    slot * BUFSIZE, BUFSIZE, BUS_DMASYNC_POSTREAD);
407 		p = vp->vp_rx_buf + slot * BUFSIZE;
408 		for (i = 0; i < len; i++)
409 			(*tp->t_linesw->l_rint)(*p++, tp);
410 		virtio_dequeue_commit(vsc, vq, slot);
411 	}
412 
413 	viocon_rx_fill(vp);
414 
415 	return;
416 }
417 
418 void
419 vioconstart(struct tty *tp)
420 {
421 	struct viocon_softc *sc = dev2sc(tp->t_dev);
422 	struct virtio_softc *vsc;
423 	struct viocon_port *vp = dev2port(tp->t_dev);
424 	struct virtqueue *vq;
425 	u_char *buf;
426 	int s, cnt, slot, ret, ndone;
427 
428 	vsc = sc->sc_virtio;
429 	vq = vp->vp_tx;
430 
431 	s = spltty();
432 
433 	ndone = viocon_tx_drain(vp, vq);
434 	if (ISSET(tp->t_state, TS_BUSY)) {
435 		if (ndone > 0)
436 			CLR(tp->t_state, TS_BUSY);
437 		else
438 			goto out;
439 	}
440 	if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP))
441 		goto out;
442 
443 	if (tp->t_outq.c_cc == 0)
444 		goto out;
445 	ndone = 0;
446 
447 	while (tp->t_outq.c_cc > 0) {
448 		ret = virtio_enqueue_prep(vsc, vq, &slot);
449 		if (ret == EAGAIN) {
450 			SET(tp->t_state, TS_BUSY);
451 			break;
452 		}
453 		KASSERT(ret == 0);
454 		ret = virtio_enqueue_reserve(vsc, vq, slot, 1);
455 		KASSERT(ret == 0);
456 		buf = vp->vp_tx_buf + slot * BUFSIZE;
457 		cnt = q_to_b(&tp->t_outq, buf, BUFSIZE);
458 		bus_dmamap_sync(virtio_dmat(vsc), vp->vp_dmamap,
459 		    vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, cnt,
460 		    BUS_DMASYNC_PREWRITE);
461 		virtio_enqueue_p(vsc, vq, slot, vp->vp_dmamap,
462 		    vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, cnt, 1);
463 		virtio_enqueue_commit(vsc, vq, slot, 0);
464 		ndone++;
465 	}
466 	if (ndone > 0)
467 		virtio_notify(vsc, vq);
468 	ttwakeupwr(tp);
469 out:
470 	splx(s);
471 }
472 
473 int
474 vioconhwiflow(struct tty *tp, int stop)
475 {
476 	struct viocon_port *vp = dev2port(tp->t_dev);
477 	int s;
478 
479 	s = spltty();
480 	vp->vp_iflow = stop;
481 	if (stop) {
482 		virtio_stop_vq_intr(vp->vp_sc->sc_virtio, vp->vp_rx);
483 	} else {
484 		virtio_start_vq_intr(vp->vp_sc->sc_virtio, vp->vp_rx);
485 		softint_schedule(vp->vp_si);
486 	}
487 	splx(s);
488 	return 1;
489 }
490 
491 int
492 vioconparam(struct tty *tp, struct termios *t)
493 {
494 	tp->t_ispeed = t->c_ispeed;
495 	tp->t_ospeed = t->c_ospeed;
496 	tp->t_cflag = t->c_cflag;
497 
498 	vioconstart(tp);
499 	return 0;
500 }
501 
502 int
503 vioconopen(dev_t dev, int flag, int mode, struct lwp *l)
504 {
505 	int unit = VIOCONUNIT(dev);
506 	int port = VIOCONPORT(dev);
507 	struct viocon_softc *sc;
508 	struct viocon_port *vp;
509 	struct tty *tp;
510 	int s, error;
511 
512 	sc = device_lookup_private(&viocon_cd, unit);
513 	if (sc == NULL)
514 		return (ENXIO);
515 	if (!device_is_active(sc->sc_dev))
516 		return (ENXIO);
517 
518 	s = spltty();
519 	if (port >= sc->sc_max_ports) {
520 		splx(s);
521 		return (ENXIO);
522 	}
523 	vp = sc->sc_ports[port];
524 	tp = vp->vp_tty;
525 #ifdef NOTYET
526 	vp->vp_guest_open = 1;
527 #endif
528 	splx(s);
529 
530 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
531 		return (EBUSY);
532 
533 	s = spltty();
534 	if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
535 		ttychars(tp);
536 		tp->t_ispeed = 1000000;
537 		tp->t_ospeed = 1000000;
538 		tp->t_cflag = TTYDEF_CFLAG|CLOCAL|CRTSCTS;
539 		tp->t_iflag = TTYDEF_IFLAG;
540 		tp->t_oflag = TTYDEF_OFLAG;
541 		tp->t_lflag = TTYDEF_LFLAG;
542 		if (vp->vp_cols != 0) {
543 			tp->t_winsize.ws_col = vp->vp_cols;
544 			tp->t_winsize.ws_row = vp->vp_rows;
545 		}
546 
547 		vioconparam(tp, &tp->t_termios);
548 		ttsetwater(tp);
549 	}
550 	splx(s);
551 
552 	error = (*tp->t_linesw->l_open)(dev, tp);
553 	return error;
554 }
555 
556 int
557 vioconclose(dev_t dev, int flag, int mode, struct lwp *l)
558 {
559 	struct viocon_port *vp = dev2port(dev);
560 	struct tty *tp = vp->vp_tty;
561 	int s;
562 
563 	if (!ISSET(tp->t_state, TS_ISOPEN))
564 		return 0;
565 
566 	(*tp->t_linesw->l_close)(tp, flag);
567 	s = spltty();
568 #ifdef NOTYET
569 	vp->vp_guest_open = 0;
570 #endif
571 	CLR(tp->t_state, TS_BUSY | TS_FLUSH);
572 	ttyclose(tp);
573 	splx(s);
574 
575 	return 0;
576 }
577 
578 int
579 vioconread(dev_t dev, struct uio *uio, int flag)
580 {
581 	struct viocon_port *vp = dev2port(dev);
582 	struct tty *tp = vp->vp_tty;
583 
584 	return (*tp->t_linesw->l_read)(tp, uio, flag);
585 }
586 
587 int
588 vioconwrite(dev_t dev, struct uio *uio, int flag)
589 {
590 	struct viocon_port *vp = dev2port(dev);
591 	struct tty *tp = vp->vp_tty;
592 
593 	return (*tp->t_linesw->l_write)(tp, uio, flag);
594 }
595 
596 struct tty *
597 viocontty(dev_t dev)
598 {
599 	struct viocon_port *vp = dev2port(dev);
600 
601 	return vp->vp_tty;
602 }
603 
604 void
605 vioconstop(struct tty *tp, int flag)
606 {
607 	int s;
608 
609 	s = spltty();
610 	if (ISSET(tp->t_state, TS_BUSY))
611 		if (!ISSET(tp->t_state, TS_TTSTOP))
612 			SET(tp->t_state, TS_FLUSH);
613 	splx(s);
614 }
615 
616 int
617 vioconioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
618 {
619 	struct viocon_port *vp = dev2port(dev);
620 	struct tty *tp;
621 	int error1, error2;
622 
623 	tp = vp->vp_tty;
624 
625 	error1 = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
626 	if (error1 >= 0)
627 		return error1;
628 	error2 = ttioctl(tp, cmd, data, flag, l);
629 	if (error2 >= 0)
630 		return error2;
631 	return ENOTTY;
632 }
633