xref: /netbsd-src/sys/dev/scsipi/scsiconf.c (revision 23c8222edbfb0f0932d88a8351d3a0cf817dfb9e)
1 /*	$NetBSD: scsiconf.c,v 1.226 2004/08/21 21:29:39 thorpej Exp $	*/
2 
3 /*-
4  * Copyright (c) 1998, 1999, 2004 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Charles M. Hannum; Jason R. Thorpe of the Numerical Aerospace
9  * Simulation Facility, NASA Ames Research Center.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. All advertising materials mentioning features or use of this software
20  *    must display the following acknowledgement:
21  *        This product includes software developed by the NetBSD
22  *        Foundation, Inc. and its contributors.
23  * 4. Neither the name of The NetBSD Foundation nor the names of its
24  *    contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37  * POSSIBILITY OF SUCH DAMAGE.
38  */
39 
40 /*
41  * Originally written by Julian Elischer (julian@tfs.com)
42  * for TRW Financial Systems for use under the MACH(2.5) operating system.
43  *
44  * TRW Financial Systems, in accordance with their agreement with Carnegie
45  * Mellon University, makes this software available to CMU to distribute
46  * or use in any manner that they see fit as long as this message is kept with
47  * the software. For this reason TFS also grants any other persons or
48  * organisations permission to use or modify this software.
49  *
50  * TFS supplies this software to be publicly redistributed
51  * on the understanding that TFS is not responsible for the correct
52  * functioning of this software in any circumstances.
53  *
54  * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
55  */
56 
57 #include <sys/cdefs.h>
58 __KERNEL_RCSID(0, "$NetBSD: scsiconf.c,v 1.226 2004/08/21 21:29:39 thorpej Exp $");
59 
60 #include <sys/param.h>
61 #include <sys/systm.h>
62 #include <sys/kernel.h>
63 #include <sys/proc.h>
64 #include <sys/kthread.h>
65 #include <sys/malloc.h>
66 #include <sys/device.h>
67 #include <sys/conf.h>
68 #include <sys/fcntl.h>
69 #include <sys/scsiio.h>
70 #include <sys/queue.h>
71 #include <sys/lock.h>
72 
73 #include <dev/scsipi/scsi_all.h>
74 #include <dev/scsipi/scsipi_all.h>
75 #include <dev/scsipi/scsiconf.h>
76 
77 #include "locators.h"
78 
79 static const struct scsipi_periphsw scsi_probe_dev = {
80 	NULL,
81 	NULL,
82 	NULL,
83 	NULL,
84 };
85 
86 struct scsi_initq {
87 	struct scsipi_channel *sc_channel;
88 	TAILQ_ENTRY(scsi_initq) scsi_initq;
89 };
90 
91 static TAILQ_HEAD(, scsi_initq) scsi_initq_head =
92     TAILQ_HEAD_INITIALIZER(scsi_initq_head);
93 static struct simplelock scsibus_interlock = SIMPLELOCK_INITIALIZER;
94 
95 static int	scsi_probe_device(struct scsibus_softc *, int, int);
96 
97 static int	scsibusmatch(struct device *, struct cfdata *, void *);
98 static void	scsibusattach(struct device *, struct device *, void *);
99 static int	scsibusactivate(struct device *, enum devact);
100 static int	scsibusdetach(struct device *, int flags);
101 static int	scsibusrescan(struct device *, const char *, const int *);
102 static void	scsidevdetached(struct device *, struct device *);
103 
104 static int	scsibussubmatch(struct device *, struct cfdata *,
105 		    const locdesc_t *, void *);
106 
107 CFATTACH_DECL2(scsibus, sizeof(struct scsibus_softc),
108     scsibusmatch, scsibusattach, scsibusdetach, scsibusactivate,
109     scsibusrescan, scsidevdetached);
110 
111 extern struct cfdriver scsibus_cd;
112 
113 static dev_type_open(scsibusopen);
114 static dev_type_close(scsibusclose);
115 static dev_type_ioctl(scsibusioctl);
116 
117 const struct cdevsw scsibus_cdevsw = {
118 	scsibusopen, scsibusclose, noread, nowrite, scsibusioctl,
119 	nostop, notty, nopoll, nommap, nokqfilter,
120 };
121 
122 static int	scsibusprint(void *, const char *);
123 static void	scsibus_config(struct scsipi_channel *, void *);
124 
125 const struct scsipi_bustype scsi_bustype = {
126 	SCSIPI_BUSTYPE_SCSI,
127 	scsi_scsipi_cmd,
128 	scsipi_interpret_sense,
129 	scsi_print_addr,
130 	scsi_kill_pending,
131 };
132 
133 int
134 scsiprint(void *aux, const char *pnp)
135 {
136 	struct scsipi_channel *chan = aux;
137 	struct scsipi_adapter *adapt = chan->chan_adapter;
138 
139 	/* only "scsibus"es can attach to "scsi"s; easy. */
140 	if (pnp)
141 		aprint_normal("scsibus at %s", pnp);
142 
143 	/* don't print channel if the controller says there can be only one. */
144 	if (adapt->adapt_nchannels != 1)
145 		aprint_normal(" channel %d", chan->chan_channel);
146 
147 	return (UNCONF);
148 }
149 
150 static int
151 scsibusmatch(struct device *parent, struct cfdata *cf, void *aux)
152 {
153 	struct scsipi_channel *chan = aux;
154 
155 	if (chan->chan_bustype->bustype_type != SCSIPI_BUSTYPE_SCSI)
156 		return 0;
157 
158 	if (cf->cf_loc[SCSICF_CHANNEL] != chan->chan_channel &&
159 	    cf->cf_loc[SCSICF_CHANNEL] != SCSICF_CHANNEL_DEFAULT)
160 		return (0);
161 
162 	return (1);
163 }
164 
165 static void
166 scsibusattach(struct device *parent, struct device *self, void *aux)
167 {
168 	struct scsibus_softc *sc = (void *) self;
169 	struct scsipi_channel *chan = aux;
170 	struct scsi_initq *scsi_initq;
171 
172 	sc->sc_channel = chan;
173 	chan->chan_name = sc->sc_dev.dv_xname;
174 
175 	aprint_naive(": SCSI bus\n");
176 	aprint_normal(": %d target%s, %d lun%s per target\n",
177 	    chan->chan_ntargets,
178 	    chan->chan_ntargets == 1 ? "" : "s",
179 	    chan->chan_nluns,
180 	    chan->chan_nluns == 1 ? "" : "s");
181 
182 	if (scsipi_adapter_addref(chan->chan_adapter))
183 		return;
184 
185 	/* Initialize the channel structure first */
186 	chan->chan_init_cb = scsibus_config;
187 	chan->chan_init_cb_arg = sc;
188 
189 	scsi_initq = malloc(sizeof(struct scsi_initq), M_DEVBUF, M_WAITOK);
190 	scsi_initq->sc_channel = chan;
191 	TAILQ_INSERT_TAIL(&scsi_initq_head, scsi_initq, scsi_initq);
192         config_pending_incr();
193 	if (scsipi_channel_init(chan)) {
194 		aprint_error("%s: failed to init channel\n",
195 		    sc->sc_dev.dv_xname);
196 		return;
197 	}
198 }
199 
200 static void
201 scsibus_config(struct scsipi_channel *chan, void *arg)
202 {
203 	struct scsibus_softc *sc = arg;
204 	struct scsi_initq *scsi_initq;
205 
206 #ifndef SCSI_DELAY
207 #define SCSI_DELAY 2
208 #endif
209 	if ((chan->chan_flags & SCSIPI_CHAN_NOSETTLE) == 0 &&
210 	    SCSI_DELAY > 0) {
211 		aprint_normal(
212 		    "%s: waiting %d seconds for devices to settle...\n",
213 		    sc->sc_dev.dv_xname, SCSI_DELAY);
214 		/* ...an identifier we know no one will use... */
215 		(void) tsleep(scsibus_config, PRIBIO,
216 		    "scsidly", SCSI_DELAY * hz);
217 	}
218 
219 	/* Make sure the devices probe in scsibus order to avoid jitter. */
220 	simple_lock(&scsibus_interlock);
221 	for (;;) {
222 		scsi_initq = TAILQ_FIRST(&scsi_initq_head);
223 		if (scsi_initq->sc_channel == chan)
224 			break;
225 		ltsleep(&scsi_initq_head, PRIBIO, "scsi_initq", 0,
226 		    &scsibus_interlock);
227 	}
228 
229 	simple_unlock(&scsibus_interlock);
230 
231 	scsi_probe_bus(sc, -1, -1);
232 
233 	simple_lock(&scsibus_interlock);
234 	TAILQ_REMOVE(&scsi_initq_head, scsi_initq, scsi_initq);
235 	simple_unlock(&scsibus_interlock);
236 
237 	free(scsi_initq, M_DEVBUF);
238 	wakeup(&scsi_initq_head);
239 
240 	scsipi_adapter_delref(chan->chan_adapter);
241 
242 	config_pending_decr();
243 }
244 
245 static int
246 scsibussubmatch(struct device *parent, struct cfdata *cf,
247 	const locdesc_t *ldesc, void *aux)
248 {
249 
250 	if (cf->cf_loc[SCSIBUSCF_TARGET] != SCSIBUSCF_TARGET_DEFAULT &&
251 	    cf->cf_loc[SCSIBUSCF_TARGET] != ldesc->locs[0])
252 		return (0);
253 	if (cf->cf_loc[SCSIBUSCF_LUN] != SCSIBUSCF_LUN_DEFAULT &&
254 	    cf->cf_loc[SCSIBUSCF_LUN] != ldesc->locs[1])
255 		return (0);
256 	return (config_match(parent, cf, aux));
257 }
258 
259 static int
260 scsibusactivate(struct device *self, enum devact act)
261 {
262 	struct scsibus_softc *sc = (void *) self;
263 	struct scsipi_channel *chan = sc->sc_channel;
264 	struct scsipi_periph *periph;
265 	int target, lun, error = 0, s;
266 
267 	s = splbio();
268 	switch (act) {
269 	case DVACT_ACTIVATE:
270 		error = EOPNOTSUPP;
271 		break;
272 
273 	case DVACT_DEACTIVATE:
274 		for (target = 0; target < chan->chan_ntargets;
275 		     target++) {
276 			if (target == chan->chan_id)
277 				continue;
278 			for (lun = 0; lun < chan->chan_nluns; lun++) {
279 				periph = scsipi_lookup_periph(chan,
280 				    target, lun);
281 				if (periph == NULL)
282 					continue;
283 				error = config_deactivate(periph->periph_dev);
284 				if (error)
285 					goto out;
286 			}
287 		}
288 		break;
289 	}
290  out:
291 	splx(s);
292 	return (error);
293 }
294 
295 static int
296 scsibusdetach(struct device *self, int flags)
297 {
298 	struct scsibus_softc *sc = (void *) self;
299 	struct scsipi_channel *chan = sc->sc_channel;
300 	struct scsipi_periph *periph;
301 	int ctarget, clun;
302 	struct scsipi_xfer *xs;
303 	int error;
304 
305 
306 	/*
307 	 * Process outstanding commands (which will never complete as the
308 	 * controller is gone).
309 	 */
310 	for (ctarget = 0; ctarget < chan->chan_ntargets; ctarget++) {
311 		if (ctarget == chan->chan_id)
312 			continue;
313 		for (clun = 0; clun < chan->chan_nluns; clun++) {
314 			periph = scsipi_lookup_periph(chan, ctarget, clun);
315 			if (periph == NULL)
316 				continue;
317 			TAILQ_FOREACH(xs, &periph->periph_xferq, device_q) {
318 				callout_stop(&xs->xs_callout);
319 				xs->error = XS_DRIVER_STUFFUP;
320 				scsipi_done(xs);
321 			}
322 		}
323 	}
324 
325 	/*
326 	 * Detach all of the periphs.
327 	 */
328 	error = scsipi_target_detach(chan, -1, -1, flags);
329 
330 	/*
331 	 * Now shut down the channel.
332 	 * XXX only if no errors ?
333 	 */
334 	scsipi_channel_shutdown(chan);
335 	return (error);
336 }
337 
338 /*
339  * Probe the requested scsi bus. It must be already set up.
340  * target and lun optionally narrow the search if not -1
341  */
342 int
343 scsi_probe_bus(struct scsibus_softc *sc, int target, int lun)
344 {
345 	struct scsipi_channel *chan = sc->sc_channel;
346 	int maxtarget, mintarget, maxlun, minlun;
347 	int error;
348 
349 	if (target == -1) {
350 		maxtarget = chan->chan_ntargets - 1;
351 		mintarget = 0;
352 	} else {
353 		if (target < 0 || target >= chan->chan_ntargets)
354 			return (EINVAL);
355 		maxtarget = mintarget = target;
356 	}
357 
358 	if (lun == -1) {
359 		maxlun = chan->chan_nluns - 1;
360 		minlun = 0;
361 	} else {
362 		if (lun < 0 || lun >= chan->chan_nluns)
363 			return (EINVAL);
364 		maxlun = minlun = lun;
365 	}
366 
367 	/*
368 	 * Some HBAs provide an abstracted view of the bus; give them an
369 	 * oppertunity to re-scan it before we do.
370 	 */
371 	if (chan->chan_adapter->adapt_ioctl != NULL)
372 		(*chan->chan_adapter->adapt_ioctl)(chan, SCBUSIOLLSCAN, NULL,
373 		    0, curproc);
374 
375 	if ((error = scsipi_adapter_addref(chan->chan_adapter)) != 0)
376 		return (error);
377 	for (target = mintarget; target <= maxtarget; target++) {
378 		if (target == chan->chan_id)
379 			continue;
380 		for (lun = minlun; lun <= maxlun; lun++) {
381 			/*
382 			 * See if there's a device present, and configure it.
383 			 */
384 			if (scsi_probe_device(sc, target, lun) == 0)
385 				break;
386 			/* otherwise something says we should look further */
387 		}
388 
389 		/*
390 		 * Now that we've discovered all of the LUNs on this
391 		 * I_T Nexus, update the xfer mode for all of them
392 		 * that we know about.
393 		 */
394 		scsipi_set_xfer_mode(chan, target, 1);
395 	}
396 	scsipi_adapter_delref(chan->chan_adapter);
397 	return (0);
398 }
399 
400 static int
401 scsibusrescan(struct device *sc, const char *ifattr, const int *locators)
402 {
403 
404 	KASSERT(ifattr && !strcmp(ifattr, "scsibus"));
405 	KASSERT(locators);
406 
407 	return (scsi_probe_bus((struct scsibus_softc *)sc,
408 		locators[SCSIBUSCF_TARGET], locators[SCSIBUSCF_LUN]));
409 }
410 
411 static void
412 scsidevdetached(struct device *sc, struct device *dev)
413 {
414 	struct scsibus_softc *ssc = (struct scsibus_softc *)sc;
415 	struct scsipi_channel *chan = ssc->sc_channel;
416 	struct scsipi_periph *periph;
417 	int target, lun;
418 
419 	target = dev->dv_locators[SCSIBUSCF_TARGET];
420 	lun = dev->dv_locators[SCSIBUSCF_LUN];
421 
422 	periph = scsipi_lookup_periph(chan, target, lun);
423 	KASSERT(periph->periph_dev == dev);
424 
425 	scsipi_remove_periph(chan, periph);
426 	free(periph, M_DEVBUF);
427 }
428 
429 /*
430  * Print out autoconfiguration information for a subdevice.
431  *
432  * This is a slight abuse of 'standard' autoconfiguration semantics,
433  * because 'print' functions don't normally print the colon and
434  * device information.  However, in this case that's better than
435  * either printing redundant information before the attach message,
436  * or having the device driver call a special function to print out
437  * the standard device information.
438  */
439 static int
440 scsibusprint(void *aux, const char *pnp)
441 {
442 	struct scsipibus_attach_args *sa = aux;
443 	struct scsipi_inquiry_pattern *inqbuf;
444 	u_int8_t type;
445 	const char *dtype;
446 	char vendor[33], product[65], revision[17];
447 	int target, lun;
448 
449 	if (pnp != NULL)
450 		aprint_normal("%s", pnp);
451 
452 	inqbuf = &sa->sa_inqbuf;
453 
454 	target = sa->sa_periph->periph_target;
455 	lun = sa->sa_periph->periph_lun;
456 	type = inqbuf->type & SID_TYPE;
457 
458 	dtype = scsipi_dtype(type);
459 
460 	scsipi_strvis(vendor, 33, inqbuf->vendor, 8);
461 	scsipi_strvis(product, 65, inqbuf->product, 16);
462 	scsipi_strvis(revision, 17, inqbuf->revision, 4);
463 
464 	aprint_normal(" target %d lun %d: <%s, %s, %s> %s %s",
465 	    target, lun, vendor, product, revision, dtype,
466 	    inqbuf->removable ? "removable" : "fixed");
467 
468 	return (UNCONF);
469 }
470 
471 static const struct scsi_quirk_inquiry_pattern scsi_quirk_patterns[] = {
472 	{{T_CDROM, T_REMOV,
473 	 "CHINON  ", "CD-ROM CDS-431  ", ""},     PQUIRK_NOLUNS},
474 	{{T_CDROM, T_REMOV,
475 	 "CHINON  ", "CD-ROM CDS-435  ", ""},     PQUIRK_NOLUNS},
476 	{{T_CDROM, T_REMOV,
477 	 "Chinon  ", "CD-ROM CDS-525  ", ""},     PQUIRK_NOLUNS},
478 	{{T_CDROM, T_REMOV,
479 	 "CHINON  ", "CD-ROM CDS-535  ", ""},     PQUIRK_NOLUNS},
480 	{{T_CDROM, T_REMOV,
481 	 "DEC     ", "RRD42   (C) DEC ", ""},     PQUIRK_NOLUNS},
482 	{{T_CDROM, T_REMOV,
483 	 "DENON   ", "DRD-25X         ", "V"},    PQUIRK_NOLUNS},
484 	{{T_CDROM, T_REMOV,
485 	 "GENERIC ", "CRD-BP2         ", ""},     PQUIRK_NOLUNS},
486 	{{T_CDROM, T_REMOV,
487 	 "HP      ", "C4324/C4325     ", ""},     PQUIRK_NOLUNS},
488 	{{T_CDROM, T_REMOV,
489 	 "IMS     ", "CDD521/10       ", "2.06"}, PQUIRK_NOLUNS},
490 	{{T_CDROM, T_REMOV,
491 	 "MATSHITA", "CD-ROM CR-5XX   ", "1.0b"}, PQUIRK_NOLUNS},
492 	{{T_CDROM, T_REMOV,
493 	 "MEDAVIS ", "RENO CD-ROMX2A  ", ""},     PQUIRK_NOLUNS},
494 	{{T_CDROM, T_REMOV,
495 	 "MEDIAVIS", "CDR-H93MV       ", "1.3"},  PQUIRK_NOLUNS},
496 	{{T_CDROM, T_REMOV,
497 	 "NEC     ", "CD-ROM DRIVE:502", ""},     PQUIRK_NOLUNS},
498 	{{T_CDROM, T_REMOV,
499 	 "NEC     ", "CD-ROM DRIVE:55 ", ""},     PQUIRK_NOLUNS},
500 	{{T_CDROM, T_REMOV,
501 	 "NEC     ", "CD-ROM DRIVE:83 ", ""},     PQUIRK_NOLUNS},
502 	{{T_CDROM, T_REMOV,
503 	 "NEC     ", "CD-ROM DRIVE:84 ", ""},     PQUIRK_NOLUNS},
504 	{{T_CDROM, T_REMOV,
505 	 "NEC     ", "CD-ROM DRIVE:841", ""},     PQUIRK_NOLUNS},
506         {{T_CDROM, T_REMOV,
507 	 "OLYMPUS ", "CDS620E         ", "1.1d"},
508 			       PQUIRK_NOLUNS|PQUIRK_NOSYNC|PQUIRK_NOCAPACITY},
509 	{{T_CDROM, T_REMOV,
510 	 "PIONEER ", "CD-ROM DR-124X  ", "1.01"}, PQUIRK_NOLUNS},
511         {{T_CDROM, T_REMOV,
512          "PLEXTOR ", "CD-ROM PX-4XCS  ", "1.01"},
513                                PQUIRK_NOLUNS|PQUIRK_NOSYNC},
514 	{{T_CDROM, T_REMOV,
515 	 "SONY    ", "CD-ROM CDU-541  ", ""},     PQUIRK_NOLUNS},
516 	{{T_CDROM, T_REMOV,
517 	 "SONY    ", "CD-ROM CDU-55S  ", ""},     PQUIRK_NOLUNS},
518 	{{T_CDROM, T_REMOV,
519 	 "SONY    ", "CD-ROM CDU-561  ", ""},     PQUIRK_NOLUNS},
520 	{{T_CDROM, T_REMOV,
521 	 "SONY    ", "CD-ROM CDU-76S", ""},
522 				PQUIRK_NOLUNS|PQUIRK_NOSYNC|PQUIRK_NOWIDE},
523 	{{T_CDROM, T_REMOV,
524 	 "SONY    ", "CD-ROM CDU-8003A", ""},     PQUIRK_NOLUNS},
525 	{{T_CDROM, T_REMOV,
526 	 "SONY    ", "CD-ROM CDU-8012 ", ""},     PQUIRK_NOLUNS},
527 	{{T_CDROM, T_REMOV,
528 	 "TEAC    ", "CD-ROM          ", "1.06"}, PQUIRK_NOLUNS},
529 	{{T_CDROM, T_REMOV,
530 	 "TEAC    ", "CD-ROM CD-56S   ", "1.0B"}, PQUIRK_NOLUNS},
531 	{{T_CDROM, T_REMOV,
532 	 "TEXEL   ", "CD-ROM          ", "1.06"}, PQUIRK_NOLUNS},
533 	{{T_CDROM, T_REMOV,
534 	 "TEXEL   ", "CD-ROM DM-XX24 K", "1.09"}, PQUIRK_NOLUNS},
535 	{{T_CDROM, T_REMOV,
536 	 "TEXEL   ", "CD-ROM DM-XX24 K", "1.10"}, PQUIRK_NOLUNS},
537 	{{T_CDROM, T_REMOV,
538 	 "TOSHIBA ", "XM-4101TASUNSLCD", ""}, PQUIRK_NOLUNS|PQUIRK_NOSYNC},
539 	/* "IBM CDRM00201     !F" 0724 is an IBM OEM Toshiba XM-4101BME */
540 	{{T_CDROM, T_REMOV,
541 	 "IBM     ", "CDRM00201     !F", "0724"}, PQUIRK_NOLUNS|PQUIRK_NOSYNC},
542 	{{T_CDROM, T_REMOV,
543 	 "ShinaKen", "CD-ROM DM-3x1S",   "1.04"}, PQUIRK_NOLUNS},
544 	{{T_CDROM, T_REMOV,
545 	 "JVC     ", "R2626",            ""},     PQUIRK_NOLUNS},
546 	{{T_CDROM, T_REMOV,
547 	 "YAMAHA", "CRW8424S",           ""},     PQUIRK_NOLUNS},
548 	{{T_CDROM, T_REMOV,
549 	 "NEC     ", "CD-ROM DRIVE:222", ""},	  PQUIRK_NOLUNS|PQUIRK_NOSYNC},
550 
551 	{{T_DIRECT, T_FIXED,
552 	 "MICROP  ", "1588-15MBSUN0669", ""},     PQUIRK_AUTOSAVE},
553 	{{T_DIRECT, T_FIXED,
554 	 "MICROP  ", "2217-15MQ1091501", ""},     PQUIRK_NOSYNCCACHE},
555 	{{T_OPTICAL, T_REMOV,
556 	 "EPSON   ", "OMD-5010        ", "3.08"}, PQUIRK_NOLUNS},
557 	{{T_DIRECT, T_FIXED,
558 	 "ADAPTEC ", "AEC-4412BD",       "1.2A"}, PQUIRK_NOMODESENSE},
559 	{{T_DIRECT, T_FIXED,
560 	 "ADAPTEC ", "ACB-4000",         ""},     PQUIRK_FORCELUNS|PQUIRK_AUTOSAVE|PQUIRK_NOMODESENSE},
561 	{{T_DIRECT, T_FIXED,
562 	 "DEC     ", "RZ55     (C) DEC", ""},     PQUIRK_AUTOSAVE},
563 	{{T_DIRECT, T_FIXED,
564 	 "EMULEX  ", "MD21/S2     ESDI", "A00"},
565 				PQUIRK_FORCELUNS|PQUIRK_AUTOSAVE},
566 	{{T_DIRECT, T_FIXED,
567 	 "MICROP",  "1548-15MZ1077801",  "HZ2P"}, PQUIRK_NOTAG},
568 	{{T_DIRECT, T_FIXED,
569 	 "HP      ", "C372",             ""},     PQUIRK_NOTAG},
570 	{{T_DIRECT, T_FIXED,
571 	 "IBMRAID ", "0662S",		 ""},     PQUIRK_AUTOSAVE},
572 	{{T_DIRECT, T_FIXED,
573 	 "IBM     ", "0663H",		 ""},     PQUIRK_AUTOSAVE},
574 	{{T_DIRECT, T_FIXED,
575 	 "IBM",	     "0664",		 ""},     PQUIRK_AUTOSAVE},
576 	{{T_DIRECT, T_FIXED,
577 	/* improperly report DT-only sync mode */
578 	 "IBM     ", "DXHS36D",		 ""},
579 				PQUIRK_CAP_SYNC|PQUIRK_CAP_WIDE16},
580 	{{T_DIRECT, T_FIXED,
581 	 "IBM     ", "DXHS18Y",		 ""},
582 				PQUIRK_CAP_SYNC|PQUIRK_CAP_WIDE16},
583 	{{T_DIRECT, T_FIXED,
584 	 "IBM     ", "H3171-S2",	 ""},
585 				PQUIRK_NOLUNS|PQUIRK_AUTOSAVE},
586 	{{T_DIRECT, T_FIXED,
587 	 "IBM     ", "KZ-C",		 ""},	  PQUIRK_AUTOSAVE},
588 	/* Broken IBM disk */
589 	{{T_DIRECT, T_FIXED,
590 	 ""	   , "DFRSS2F",		 ""},	  PQUIRK_AUTOSAVE},
591 	{{T_DIRECT, T_REMOV,
592 	 "MPL     ", "MC-DISK-        ", ""},     PQUIRK_NOLUNS},
593 	{{T_DIRECT, T_FIXED,
594 	 "MAXTOR  ", "XT-3280         ", ""},     PQUIRK_NOLUNS},
595 	{{T_DIRECT, T_FIXED,
596 	 "MAXTOR  ", "XT-4380S        ", ""},     PQUIRK_NOLUNS},
597 	{{T_DIRECT, T_FIXED,
598 	 "MAXTOR  ", "MXT-1240S       ", ""},     PQUIRK_NOLUNS},
599 	{{T_DIRECT, T_FIXED,
600 	 "MAXTOR  ", "XT-4170S        ", ""},     PQUIRK_NOLUNS},
601 	{{T_DIRECT, T_FIXED,
602 	 "MAXTOR  ", "XT-8760S",         ""},     PQUIRK_NOLUNS},
603 	{{T_DIRECT, T_FIXED,
604 	 "MAXTOR  ", "LXT-213S        ", ""},     PQUIRK_NOLUNS},
605 	{{T_DIRECT, T_FIXED,
606 	 "MAXTOR  ", "LXT-213S SUN0207", ""},     PQUIRK_NOLUNS},
607 	{{T_DIRECT, T_FIXED,
608 	 "MAXTOR  ", "LXT-200S        ", ""},     PQUIRK_NOLUNS},
609 	{{T_DIRECT, T_FIXED,
610 	 "MEGADRV ", "EV1000",           ""},     PQUIRK_NOMODESENSE},
611 	{{T_DIRECT, T_FIXED,
612 	 "MICROP", "1991-27MZ",          ""},     PQUIRK_NOTAG},
613 	{{T_DIRECT, T_FIXED,
614 	 "MST     ", "SnapLink        ", ""},     PQUIRK_NOLUNS},
615 	{{T_DIRECT, T_FIXED,
616 	 "NEC     ", "D3847           ", "0307"}, PQUIRK_NOLUNS},
617 	{{T_DIRECT, T_FIXED,
618 	 "QUANTUM ", "ELS85S          ", ""},     PQUIRK_AUTOSAVE},
619 	{{T_DIRECT, T_FIXED,
620 	 "QUANTUM ", "LPS525S         ", ""},     PQUIRK_NOLUNS},
621 	{{T_DIRECT, T_FIXED,
622 	 "QUANTUM ", "P105S 910-10-94x", ""},     PQUIRK_NOLUNS},
623 	{{T_DIRECT, T_FIXED,
624 	 "QUANTUM ", "PD1225S         ", ""},     PQUIRK_NOLUNS},
625 	{{T_DIRECT, T_FIXED,
626 	 "QUANTUM ", "PD210S   SUN0207", ""},     PQUIRK_NOLUNS},
627 	{{T_DIRECT, T_FIXED,
628 	 "QUANTUM ", "ATLAS IV 9 WLS", "0A0A"},   PQUIRK_CAP_NODT},
629 	{{T_DIRECT, T_FIXED,
630 	 "RODIME  ", "RO3000S         ", ""},     PQUIRK_NOLUNS},
631 	{{T_DIRECT, T_FIXED,
632 	 "SEAGATE ", "ST125N          ", ""},     PQUIRK_NOLUNS},
633 	{{T_DIRECT, T_FIXED,
634 	 "SEAGATE ", "ST157N          ", ""},     PQUIRK_NOLUNS},
635 	{{T_DIRECT, T_FIXED,
636 	 "SEAGATE ", "ST296           ", ""},     PQUIRK_NOLUNS},
637 	{{T_DIRECT, T_FIXED,
638 	 "SEAGATE ", "ST296N          ", ""},     PQUIRK_NOLUNS},
639 	{{T_DIRECT, T_FIXED,
640 	 "SEAGATE ", "ST318404LC      ", ""},     PQUIRK_NOLUNS},
641 	{{T_DIRECT, T_FIXED,
642 	 "SEAGATE ", "ST15150N        ", ""},     PQUIRK_NOTAG},
643 	{{T_DIRECT, T_FIXED,
644 	 "SEAGATE ", "ST19171",          ""},     PQUIRK_NOMODESENSE},
645 	{{T_DIRECT, T_FIXED,
646 	 "SEAGATE ", "ST32430N",         ""},     PQUIRK_CAP_SYNC},
647 	{{T_DIRECT, T_FIXED,
648 	 "SEAGATE ", "ST34501FC       ", ""},     PQUIRK_NOMODESENSE},
649 	{{T_DIRECT, T_FIXED,
650 	 "SEAGATE ", "SX910800N",        ""},     PQUIRK_NOTAG},
651 	{{T_DIRECT, T_FIXED,
652 	 "TOSHIBA ", "MK538FB         ", "6027"}, PQUIRK_NOLUNS},
653 	{{T_DIRECT, T_FIXED,
654 	 "MICROP  ", "1924",          ""},     PQUIRK_CAP_SYNC},
655 	{{T_DIRECT, T_FIXED,
656 	 "FUJITSU ", "M2266",         ""},     PQUIRK_CAP_SYNC},
657 
658 	{{T_DIRECT, T_REMOV,
659 	 "IOMEGA", "ZIP 100",		 "J.03"}, PQUIRK_NOLUNS},
660 	{{T_DIRECT, T_REMOV,
661 	 "INSITE", "I325VM",             ""},     PQUIRK_NOLUNS},
662 
663 	/* XXX: QIC-36 tape behind Emulex adapter.  Very broken. */
664 	{{T_SEQUENTIAL, T_REMOV,
665 	 "        ", "                ", "    "}, PQUIRK_NOLUNS},
666 	{{T_SEQUENTIAL, T_REMOV,
667 	 "EMULEX  ", "MT-02 QIC       ", ""},     PQUIRK_NOLUNS},
668 	{{T_SEQUENTIAL, T_REMOV,
669 	 "CALIPER ", "CP150           ", ""},     PQUIRK_NOLUNS},
670 	{{T_SEQUENTIAL, T_REMOV,
671 	 "EXABYTE ", "EXB-8200        ", ""},     PQUIRK_NOLUNS},
672 	{{T_SEQUENTIAL, T_REMOV,
673 	 "SONY    ", "GY-10C          ", ""},     PQUIRK_NOLUNS},
674 	{{T_SEQUENTIAL, T_REMOV,
675 	 "SONY    ", "SDT-2000        ", "2.09"}, PQUIRK_NOLUNS},
676 	{{T_SEQUENTIAL, T_REMOV,
677 	 "SONY    ", "SDT-5000        ", "3."},   PQUIRK_NOSYNC|PQUIRK_NOWIDE},
678 	{{T_SEQUENTIAL, T_REMOV,
679 	 "SONY    ", "SDT-5200        ", "3."},   PQUIRK_NOLUNS},
680 	{{T_SEQUENTIAL, T_REMOV,
681 	 "TANDBERG", " TDC 3600       ", ""},     PQUIRK_NOLUNS},
682 	/* Following entry reported as a Tandberg 3600; ref. PR1933 */
683 	{{T_SEQUENTIAL, T_REMOV,
684 	 "ARCHIVE ", "VIPER 150  21247", ""},     PQUIRK_NOLUNS},
685 	/* Following entry for a Cipher ST150S; ref. PR4171 */
686 	{{T_SEQUENTIAL, T_REMOV,
687 	 "ARCHIVE ", "VIPER 1500 21247", "2.2G"}, PQUIRK_NOLUNS},
688 	{{T_SEQUENTIAL, T_REMOV,
689 	 "ARCHIVE ", "Python 28454-XXX", ""},     PQUIRK_NOLUNS},
690 	{{T_SEQUENTIAL, T_REMOV,
691 	 "WANGTEK ", "5099ES SCSI",      ""},     PQUIRK_NOLUNS},
692 	{{T_SEQUENTIAL, T_REMOV,
693 	 "WANGTEK ", "5150ES SCSI",      ""},     PQUIRK_NOLUNS},
694 	{{T_SEQUENTIAL, T_REMOV,
695 	 "WANGTEK ", "SCSI-36",		 ""},     PQUIRK_NOLUNS},
696 	{{T_SEQUENTIAL, T_REMOV,
697 	 "WangDAT ", "Model 1300      ", "02.4"}, PQUIRK_NOSYNC|PQUIRK_NOWIDE},
698 	{{T_SEQUENTIAL, T_REMOV,
699 	 "WangDAT ", "Model 2600      ", "01.7"}, PQUIRK_NOSYNC|PQUIRK_NOWIDE},
700 	{{T_SEQUENTIAL, T_REMOV,
701 	 "WangDAT ", "Model 3200      ", "02.2"}, PQUIRK_NOSYNC|PQUIRK_NOWIDE},
702 	{{T_SEQUENTIAL, T_REMOV,
703 	 "TEAC    ", "MT-2ST/N50      ", ""},     PQUIRK_NOLUNS},
704 
705 	{{T_SCANNER, T_FIXED,
706 	 "RICOH   ", "IS60            ", "1R08"}, PQUIRK_NOLUNS},
707 	{{T_SCANNER, T_FIXED,
708 	 "UMAX    ", "Astra 1200S     ", "V2.9"}, PQUIRK_NOLUNS},
709 	{{T_SCANNER, T_FIXED,
710 	 "UMAX    ", "Astra 1220S     ", ""},     PQUIRK_NOLUNS},
711 	{{T_SCANNER, T_FIXED,
712 	 "UMAX    ", "UMAX S-6E       ", "V2.0"}, PQUIRK_NOLUNS},
713 	{{T_SCANNER, T_FIXED,
714 	 "UMAX    ", "UMAX S-12       ", "V2.1"}, PQUIRK_NOLUNS},
715 	{{T_SCANNER, T_FIXED,
716 	 "ULTIMA  ", "A6000C          ", ""},     PQUIRK_NOLUNS},
717 	{{T_PROCESSOR, T_FIXED,
718 	 "SYMBIOS",  "",                 ""},     PQUIRK_NOLUNS},
719 	{{T_PROCESSOR, T_FIXED,
720 	 "LITRONIC", "PCMCIA          ", ""},     PQUIRK_NOLUNS},
721 	{{T_CHANGER, T_REMOV,
722 	 "SONY    ", "CDL1100         ", ""},     PQUIRK_NOLUNS},
723 	{{T_ENCLOSURE, T_FIXED,
724 	 "SUN     ", "SENA            ", ""},     PQUIRK_NOLUNS},
725 };
726 
727 /*
728  * given a target and lun, ask the device what
729  * it is, and find the correct driver table
730  * entry.
731  */
732 static int
733 scsi_probe_device(struct scsibus_softc *sc, int target, int lun)
734 {
735 	struct scsipi_channel *chan = sc->sc_channel;
736 	struct scsipi_periph *periph;
737 	struct scsipi_inquiry_data inqbuf;
738 	struct scsi_quirk_inquiry_pattern *finger;
739 	int checkdtype, priority, docontinue, quirks;
740 	struct scsipibus_attach_args sa;
741 	struct cfdata *cf;
742 	int help[3];
743 	locdesc_t *locd = (void *)&help;
744 	struct device *chld;
745 
746 	/*
747 	 * Assume no more luns to search after this one.
748 	 * If we successfully get Inquiry data and after
749 	 * merging quirks we find we can probe for more
750 	 * luns, we will.
751 	 */
752 	docontinue = 0;
753 
754 	/* Skip this slot if it is already attached. */
755 	if (scsipi_lookup_periph(chan, target, lun) != NULL)
756 		return (docontinue);
757 
758 	periph = scsipi_alloc_periph(M_NOWAIT);
759 	if (periph == NULL) {
760 #ifdef	DIAGNOSTIC
761 		aprint_error(
762 		    "%s: cannot allocate periph for target %d lun %d\n",
763 		    sc->sc_dev.dv_xname, target, lun);
764 #endif
765 		return (ENOMEM);
766 	}
767 	periph->periph_channel = chan;
768 	periph->periph_switch = &scsi_probe_dev;
769 
770 	periph->periph_target = target;
771 	periph->periph_lun = lun;
772 	periph->periph_quirks = chan->chan_defquirks;
773 
774 #ifdef SCSIPI_DEBUG
775 	if (SCSIPI_DEBUG_TYPE == SCSIPI_BUSTYPE_SCSI &&
776 	    SCSIPI_DEBUG_TARGET == target &&
777 	    SCSIPI_DEBUG_LUN == lun)
778 		periph->periph_dbflags |= SCSIPI_DEBUG_FLAGS;
779 #endif
780 
781 	/*
782 	 * Ask the device what it is
783 	 */
784 
785 #ifdef SCSI_2_DEF
786 	/* some devices need to be told to go to SCSI2 */
787 	/* However some just explode if you tell them this.. leave it out */
788 	scsi_change_def(periph, XS_CTL_DISCOVERY | XS_CTL_SILENT);
789 #endif /* SCSI_2_DEF */
790 
791 	/* Now go ask the device all about itself. */
792 	memset(&inqbuf, 0, sizeof(inqbuf));
793 	{
794 		u_int8_t *extension = &inqbuf.flags1;
795 		int len = 0;
796 		while (len < 3)
797 			extension[len++] = '\0';
798 		while (len < 3 + 28)
799 			extension[len++] = ' ';
800 		while (len < 3 + 28 + 20)
801 			extension[len++] = '\0';
802 		while (len < 3 + 28 + 20 + 1)
803 			extension[len++] = '\0';
804 		while (len < 3 + 28 + 20 + 1 + 1)
805 			extension[len++] = '\0';
806 		while (len < 3 + 28 + 20 + 1 + 1 + (8*2))
807 			extension[len++] = ' ';
808 	}
809 	if (scsipi_inquire(periph, &inqbuf,
810 	    XS_CTL_DISCOVERY | XS_CTL_DATA_ONSTACK | XS_CTL_SILENT) != 0)
811 		goto bad;
812 
813 	periph->periph_type = inqbuf.device & SID_TYPE;
814 	if (inqbuf.dev_qual2 & SID_REMOVABLE)
815 		periph->periph_flags |= PERIPH_REMOVABLE;
816 	periph->periph_version = inqbuf.version & SID_ANSII;
817 
818 	/*
819 	 * Any device qualifier that has the top bit set (qualifier&4 != 0)
820 	 * is vendor specific and won't match in this switch.
821 	 * All we do here is throw out bad/negative responses.
822 	 */
823 	checkdtype = 0;
824 	switch (inqbuf.device & SID_QUAL) {
825 	case SID_QUAL_LU_PRESENT:
826 		checkdtype = 1;
827 		break;
828 
829 	case SID_QUAL_LU_NOTPRESENT:
830 	case SID_QUAL_reserved:
831 	case SID_QUAL_LU_NOT_SUPP:
832 		goto bad;
833 
834 	default:
835 		break;
836 	}
837 
838 	/* Let the adapter driver handle the device separatley if it wants. */
839 	if (chan->chan_adapter->adapt_accesschk != NULL &&
840 	    (*chan->chan_adapter->adapt_accesschk)(periph, &sa.sa_inqbuf))
841 		goto bad;
842 
843 	if (checkdtype) {
844 		switch (periph->periph_type) {
845 		case T_DIRECT:
846 		case T_SEQUENTIAL:
847 		case T_PRINTER:
848 		case T_PROCESSOR:
849 		case T_WORM:
850 		case T_CDROM:
851 		case T_SCANNER:
852 		case T_OPTICAL:
853 		case T_CHANGER:
854 		case T_COMM:
855 		case T_IT8_1:
856 		case T_IT8_2:
857 		case T_STORARRAY:
858 		case T_ENCLOSURE:
859 		case T_SIMPLE_DIRECT:
860 		case T_OPTIC_CARD_RW:
861 		case T_OBJECT_STORED:
862 		default:
863 			break;
864 		case T_NODEVICE:
865 			goto bad;
866 		}
867 	}
868 
869 	sa.sa_periph = periph;
870 	sa.sa_inqbuf.type = inqbuf.device;
871 	sa.sa_inqbuf.removable = inqbuf.dev_qual2 & SID_REMOVABLE ?
872 	    T_REMOV : T_FIXED;
873 	sa.sa_inqbuf.vendor = inqbuf.vendor;
874 	sa.sa_inqbuf.product = inqbuf.product;
875 	sa.sa_inqbuf.revision = inqbuf.revision;
876 	sa.scsipi_info.scsi_version = inqbuf.version;
877 	sa.sa_inqptr = &inqbuf;
878 
879 	finger = (struct scsi_quirk_inquiry_pattern *)scsipi_inqmatch(
880 	    &sa.sa_inqbuf, (caddr_t)scsi_quirk_patterns,
881 	    sizeof(scsi_quirk_patterns)/sizeof(scsi_quirk_patterns[0]),
882 	    sizeof(scsi_quirk_patterns[0]), &priority);
883 
884 	if (finger != NULL)
885 		quirks = finger->quirks;
886 	else
887 		quirks = 0;
888 
889 	/*
890 	 * Determine the operating mode capabilities of the device.
891 	 */
892 	if (periph->periph_version >= 2) {
893 		if ((inqbuf.flags3 & SID_CmdQue) != 0 &&
894 		    (quirks & PQUIRK_NOTAG) == 0)
895 			periph->periph_cap |= PERIPH_CAP_TQING;
896 		if ((inqbuf.flags3 & SID_Linked) != 0)
897 			periph->periph_cap |= PERIPH_CAP_LINKCMDS;
898 		if ((inqbuf.flags3 & SID_Sync) != 0 &&
899 		    (quirks & PQUIRK_NOSYNC) == 0)
900 			periph->periph_cap |= PERIPH_CAP_SYNC;
901 		if ((inqbuf.flags3 & SID_WBus16) != 0 &&
902 		    (quirks & PQUIRK_NOWIDE) == 0)
903 			periph->periph_cap |= PERIPH_CAP_WIDE16;
904 		if ((inqbuf.flags3 & SID_WBus32) != 0 &&
905 		    (quirks & PQUIRK_NOWIDE) == 0)
906 			periph->periph_cap |= PERIPH_CAP_WIDE32;
907 		if ((inqbuf.flags3 & SID_SftRe) != 0)
908 			periph->periph_cap |= PERIPH_CAP_SFTRESET;
909 		if ((inqbuf.flags3 & SID_RelAdr) != 0)
910 			periph->periph_cap |= PERIPH_CAP_RELADR;
911 		/* SPC-2 */
912 		if (periph->periph_version >= 3 &&
913 		    !(quirks & PQUIRK_CAP_NODT)){
914 			/*
915 			 * Report ST clocking though CAP_WIDExx/CAP_SYNC.
916 			 * If the device only supports DT, clear these
917 			 * flags (DT implies SYNC and WIDE)
918 			 */
919 			switch (inqbuf.flags4 & SID_Clocking) {
920 			case SID_CLOCKING_DT_ONLY:
921 				periph->periph_cap &=
922 				    ~(PERIPH_CAP_SYNC |
923 				      PERIPH_CAP_WIDE16 |
924 				      PERIPH_CAP_WIDE32);
925 				/* FALLTHOUGH */
926 			case SID_CLOCKING_SD_DT:
927 				periph->periph_cap |= PERIPH_CAP_DT;
928 				break;
929 			default: /* ST only or invalid */
930 				/* nothing to do */
931 				break;
932 			}
933 		}
934 		if (periph->periph_version >= 3) {
935 			if (inqbuf.flags4 & SID_IUS)
936 				periph->periph_cap |= PERIPH_CAP_IUS;
937 			if (inqbuf.flags4 & SID_QAS)
938 				periph->periph_cap |= PERIPH_CAP_QAS;
939 		}
940 	}
941 	if (quirks & PQUIRK_CAP_SYNC)
942 		periph->periph_cap |= PERIPH_CAP_SYNC;
943 	if (quirks & PQUIRK_CAP_WIDE16)
944 		periph->periph_cap |= PERIPH_CAP_WIDE16;
945 
946 	/*
947 	 * Now apply any quirks from the table.
948 	 */
949 	periph->periph_quirks |= quirks;
950 	if (periph->periph_version == 0 &&
951 	    (periph->periph_quirks & PQUIRK_FORCELUNS) == 0)
952 		periph->periph_quirks |= PQUIRK_NOLUNS;
953 
954 	if ((periph->periph_quirks & PQUIRK_NOLUNS) == 0)
955 		docontinue = 1;
956 
957 	locd->len = 2;
958 	locd->locs[0] = target;
959 	locd->locs[1] = lun;
960 
961 	if ((cf = config_search_loc(scsibussubmatch, &sc->sc_dev,
962 	     "scsibus", locd, &sa)) != NULL) {
963 		scsipi_insert_periph(chan, periph);
964 		/*
965 		 * XXX Can't assign periph_dev here, because we'll
966 		 * XXX need it before config_attach() returns.  Must
967 		 * XXX assign it in periph driver.
968 		 */
969 		chld = config_attach_loc(&sc->sc_dev, cf, locd, &sa,
970 					 scsibusprint);
971 	} else {
972 		scsibusprint(&sa, sc->sc_dev.dv_xname);
973 		aprint_normal(" not configured\n");
974 		goto bad;
975 	}
976 
977 	return (docontinue);
978 
979 bad:
980 	free(periph, M_DEVBUF);
981 	return (docontinue);
982 }
983 
984 /****** Entry points for user control of the SCSI bus. ******/
985 
986 static int
987 scsibusopen(dev_t dev, int flag, int fmt, struct proc *p)
988 {
989 	struct scsibus_softc *sc;
990 	int error, unit = minor(dev);
991 
992 	if (unit >= scsibus_cd.cd_ndevs ||
993 	    (sc = scsibus_cd.cd_devs[unit]) == NULL)
994 		return (ENXIO);
995 
996 	if (sc->sc_flags & SCSIBUSF_OPEN)
997 		return (EBUSY);
998 
999 	if ((error = scsipi_adapter_addref(sc->sc_channel->chan_adapter)) != 0)
1000 		return (error);
1001 
1002 	sc->sc_flags |= SCSIBUSF_OPEN;
1003 
1004 	return (0);
1005 }
1006 
1007 static int
1008 scsibusclose(dev_t dev, int flag, int fmt, struct proc *p)
1009 {
1010 	struct scsibus_softc *sc = scsibus_cd.cd_devs[minor(dev)];
1011 
1012 	scsipi_adapter_delref(sc->sc_channel->chan_adapter);
1013 
1014 	sc->sc_flags &= ~SCSIBUSF_OPEN;
1015 
1016 	return (0);
1017 }
1018 
1019 static int
1020 scsibusioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
1021 {
1022 	struct scsibus_softc *sc = scsibus_cd.cd_devs[minor(dev)];
1023 	struct scsipi_channel *chan = sc->sc_channel;
1024 	int error;
1025 
1026 	/*
1027 	 * Enforce write permission for ioctls that change the
1028 	 * state of the bus.  Host adapter specific ioctls must
1029 	 * be checked by the adapter driver.
1030 	 */
1031 	switch (cmd) {
1032 	case SCBUSIOSCAN:
1033 	case SCBUSIODETACH:
1034 	case SCBUSIORESET:
1035 		if ((flag & FWRITE) == 0)
1036 			return (EBADF);
1037 	}
1038 
1039 	switch (cmd) {
1040 	case SCBUSIOSCAN:
1041 	    {
1042 		struct scbusioscan_args *a =
1043 		    (struct scbusioscan_args *)addr;
1044 
1045 		error = scsi_probe_bus(sc, a->sa_target, a->sa_lun);
1046 		break;
1047 	    }
1048 
1049 	case SCBUSIODETACH:
1050 	    {
1051 		struct scbusiodetach_args *a =
1052 		    (struct scbusiodetach_args *)addr;
1053 
1054 		error = scsipi_target_detach(chan, a->sa_target, a->sa_lun, 0);
1055 		break;
1056 	    }
1057 
1058 
1059 	case SCBUSIORESET:
1060 		/* FALLTHROUGH */
1061 	default:
1062 		if (chan->chan_adapter->adapt_ioctl == NULL)
1063 			error = ENOTTY;
1064 		else
1065 			error = (*chan->chan_adapter->adapt_ioctl)(chan,
1066 			    cmd, addr, flag, p);
1067 		break;
1068 	}
1069 
1070 	return (error);
1071 }
1072