1 /* $NetBSD: st.c,v 1.243 2022/02/23 21:54:41 andvar Exp $ */
2
3 /*-
4 * Copyright (c) 1998, 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.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Originally written by Julian Elischer (julian@tfs.com)
34 * for TRW Financial Systems for use under the MACH(2.5) operating system.
35 *
36 * TRW Financial Systems, in accordance with their agreement with Carnegie
37 * Mellon University, makes this software available to CMU to distribute
38 * or use in any manner that they see fit as long as this message is kept with
39 * the software. For this reason TFS also grants any other persons or
40 * organisations permission to use or modify this software.
41 *
42 * TFS supplies this software to be publicly redistributed
43 * on the understanding that TFS is not responsible for the correct
44 * functioning of this software in any circumstances.
45 *
46 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
47 * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993
48 *
49 * A lot of rewhacking done by mjacob (mjacob@nas.nasa.gov).
50 */
51
52 #include <sys/cdefs.h>
53 __KERNEL_RCSID(0, "$NetBSD: st.c,v 1.243 2022/02/23 21:54:41 andvar Exp $");
54
55 #ifdef _KERNEL_OPT
56 #include "opt_scsi.h"
57 #endif
58
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/fcntl.h>
62 #include <sys/errno.h>
63 #include <sys/ioctl.h>
64 #include <sys/malloc.h>
65 #include <sys/buf.h>
66 #include <sys/bufq.h>
67 #include <sys/proc.h>
68 #include <sys/mtio.h>
69 #include <sys/device.h>
70 #include <sys/conf.h>
71 #include <sys/kernel.h>
72 #include <sys/vnode.h>
73 #include <sys/iostat.h>
74 #include <sys/sysctl.h>
75
76 #include <dev/scsipi/scsi_spc.h>
77 #include <dev/scsipi/scsipi_all.h>
78 #include <dev/scsipi/scsi_all.h>
79 #include <dev/scsipi/scsi_tape.h>
80 #include <dev/scsipi/scsipiconf.h>
81 #include <dev/scsipi/scsipi_base.h>
82 #include <dev/scsipi/stvar.h>
83
84 /* Defines for device specific stuff */
85 #define DEF_FIXED_BSIZE 512
86
87 #define STMODE(z) ( minor(z) & 0x03)
88 #define STDSTY(z) ((minor(z) >> 2) & 0x03)
89 #define STUNIT(z) ((minor(z) >> 4) )
90 #define STNMINOR 16
91
92 #define NORMAL_MODE 0
93 #define NOREW_MODE 1
94 #define EJECT_MODE 2
95 #define CTRL_MODE 3
96
97 #ifndef ST_MOUNT_DELAY
98 #define ST_MOUNT_DELAY 0
99 #endif
100
101 static dev_type_open(stopen);
102 static dev_type_close(stclose);
103 static dev_type_read(stread);
104 static dev_type_write(stwrite);
105 static dev_type_ioctl(stioctl);
106 static dev_type_strategy(ststrategy);
107 static dev_type_dump(stdump);
108
109 const struct bdevsw st_bdevsw = {
110 .d_open = stopen,
111 .d_close = stclose,
112 .d_strategy = ststrategy,
113 .d_ioctl = stioctl,
114 .d_dump = stdump,
115 .d_psize = nosize,
116 .d_discard = nodiscard,
117 .d_flag = D_TAPE | D_MPSAFE
118 };
119
120 const struct cdevsw st_cdevsw = {
121 .d_open = stopen,
122 .d_close = stclose,
123 .d_read = stread,
124 .d_write = stwrite,
125 .d_ioctl = stioctl,
126 .d_stop = nostop,
127 .d_tty = notty,
128 .d_poll = nopoll,
129 .d_mmap = nommap,
130 .d_kqfilter = nokqfilter,
131 .d_discard = nodiscard,
132 .d_flag = D_TAPE | D_MPSAFE
133 };
134
135 /*
136 * Define various devices that we know mis-behave in some way,
137 * and note how they are bad, so we can correct for them
138 */
139
140 static const struct st_quirk_inquiry_pattern st_quirk_patterns[] = {
141 {{T_SEQUENTIAL, T_REMOV,
142 " ", " ", " "}, {0, 0, {
143 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
144 {ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */
145 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */
146 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */
147 }}},
148 {{T_SEQUENTIAL, T_REMOV,
149 "TANDBERG", " TDC 3600 ", ""}, {0, 12, {
150 {0, 0, 0}, /* minor 0-3 */
151 {ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */
152 {0, 0, QIC_150}, /* minor 8-11 */
153 {0, 0, QIC_120} /* minor 12-15 */
154 }}},
155 {{T_SEQUENTIAL, T_REMOV,
156 "TANDBERG", " TDC 3800 ", ""}, {0, 0, {
157 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
158 {0, 0, QIC_525}, /* minor 4-7 */
159 {0, 0, QIC_150}, /* minor 8-11 */
160 {0, 0, QIC_120} /* minor 12-15 */
161 }}},
162 {{T_SEQUENTIAL, T_REMOV,
163 "TANDBERG", " SLR5 4/8GB ", ""}, {0, 0, {
164 {ST_Q_FORCE_BLKSIZE, 1024, 0}, /* minor 0-3 */
165 {0, 0, 0}, /* minor 4-7 */
166 {0, 0, 0}, /* minor 8-11 */
167 {0, 0, 0} /* minor 12-15 */
168 }}},
169 /*
170 * lacking a manual for the 4200, it's not clear what the
171 * specific density codes should be- the device is a 2.5GB
172 * capable QIC drive, those density codes aren't readily
173 * available. The 'default' will just have to do.
174 */
175 {{T_SEQUENTIAL, T_REMOV,
176 "TANDBERG", " TDC 4200 ", ""}, {0, 0, {
177 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
178 {0, 0, QIC_525}, /* minor 4-7 */
179 {0, 0, QIC_150}, /* minor 8-11 */
180 {0, 0, QIC_120} /* minor 12-15 */
181 }}},
182 /*
183 * At least -005 and -007 need this. I'll assume they all do unless I
184 * hear otherwise. - mycroft, 31MAR1994
185 */
186 {{T_SEQUENTIAL, T_REMOV,
187 "ARCHIVE ", "VIPER 2525 25462", ""}, {0, 0, {
188 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */
189 {ST_Q_SENSE_HELP, 0, QIC_525}, /* minor 4-7 */
190 {0, 0, QIC_150}, /* minor 8-11 */
191 {0, 0, QIC_120} /* minor 12-15 */
192 }}},
193 /*
194 * One user reports that this works for his tape drive. It probably
195 * needs more work. - mycroft, 09APR1994
196 */
197 {{T_SEQUENTIAL, T_REMOV,
198 "SANKYO ", "CP525 ", ""}, {0, 0, {
199 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
200 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */
201 {0, 0, QIC_150}, /* minor 8-11 */
202 {0, 0, QIC_120} /* minor 12-15 */
203 }}},
204 {{T_SEQUENTIAL, T_REMOV,
205 "ANRITSU ", "DMT780 ", ""}, {0, 0, {
206 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
207 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */
208 {0, 0, QIC_150}, /* minor 8-11 */
209 {0, 0, QIC_120} /* minor 12-15 */
210 }}},
211 {{T_SEQUENTIAL, T_REMOV,
212 "ARCHIVE ", "VIPER 150 21247", ""}, {ST_Q_ERASE_NOIMM, 12, {
213 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */
214 {0, 0, QIC_150}, /* minor 4-7 */
215 {0, 0, QIC_120}, /* minor 8-11 */
216 {0, 0, QIC_24} /* minor 12-15 */
217 }}},
218 {{T_SEQUENTIAL, T_REMOV,
219 "ARCHIVE ", "VIPER 150 21531", ""}, {ST_Q_ERASE_NOIMM, 12, {
220 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */
221 {0, 0, QIC_150}, /* minor 4-7 */
222 {0, 0, QIC_120}, /* minor 8-11 */
223 {0, 0, QIC_24} /* minor 12-15 */
224 }}},
225 {{T_SEQUENTIAL, T_REMOV,
226 "WANGTEK ", "5099ES SCSI", ""}, {0, 0, {
227 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
228 {0, 0, QIC_11}, /* minor 4-7 */
229 {0, 0, QIC_24}, /* minor 8-11 */
230 {0, 0, QIC_24} /* minor 12-15 */
231 }}},
232 {{T_SEQUENTIAL, T_REMOV,
233 "WANGTEK ", "5150ES SCSI", ""}, {0, 0, {
234 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
235 {0, 0, QIC_24}, /* minor 4-7 */
236 {0, 0, QIC_120}, /* minor 8-11 */
237 {0, 0, QIC_150} /* minor 12-15 */
238 }}},
239 {{T_SEQUENTIAL, T_REMOV,
240 "WANGTEK ", "5525ES SCSI REV7", ""}, {0, 0, {
241 {0, 0, 0}, /* minor 0-3 */
242 {ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */
243 {0, 0, QIC_150}, /* minor 8-11 */
244 {0, 0, QIC_120} /* minor 12-15 */
245 }}},
246 {{T_SEQUENTIAL, T_REMOV,
247 "WangDAT ", "Model 1300 ", ""}, {0, 0, {
248 {0, 0, 0}, /* minor 0-3 */
249 {ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */
250 {ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */
251 {ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */
252 }}},
253 {{T_SEQUENTIAL, T_REMOV,
254 "EXABYTE ", "EXB-8200 ", "263H"}, {0, 5, {
255 {0, 0, 0}, /* minor 0-3 */
256 {0, 0, 0}, /* minor 4-7 */
257 {0, 0, 0}, /* minor 8-11 */
258 {0, 0, 0} /* minor 12-15 */
259 }}},
260 {{T_SEQUENTIAL, T_REMOV,
261 "STK", "9490", ""},
262 {ST_Q_FORCE_BLKSIZE, 0, {
263 {0, 0, 0}, /* minor 0-3 */
264 {0, 0, 0}, /* minor 4-7 */
265 {0, 0, 0}, /* minor 8-11 */
266 {0, 0, 0} /* minor 12-15 */
267 }}},
268 {{T_SEQUENTIAL, T_REMOV,
269 "STK", "SD-3", ""},
270 {ST_Q_FORCE_BLKSIZE, 0, {
271 {0, 0, 0}, /* minor 0-3 */
272 {0, 0, 0}, /* minor 4-7 */
273 {0, 0, 0}, /* minor 8-11 */
274 {0, 0, 0} /* minor 12-15 */
275 }}},
276 {{T_SEQUENTIAL, T_REMOV,
277 "IBM", "03590", ""}, {ST_Q_IGNORE_LOADS, 0, {
278 {0, 0, 0}, /* minor 0-3 */
279 {0, 0, 0}, /* minor 4-7 */
280 {0, 0, 0}, /* minor 8-11 */
281 {0, 0, 0} /* minor 12-15 */
282 }}},
283 {{T_SEQUENTIAL, T_REMOV,
284 "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, 0, {
285 {0, 0, QIC_3095}, /* minor 0-3 */
286 {0, 0, QIC_3095}, /* minor 4-7 */
287 {0, 0, QIC_3095}, /* minor 8-11 */
288 {0, 0, QIC_3095}, /* minor 12-15 */
289 }}},
290 #if 0
291 {{T_SEQUENTIAL, T_REMOV,
292 "EXABYTE ", "EXB-8200 ", ""}, {0, 12, {
293 {0, 0, 0}, /* minor 0-3 */
294 {0, 0, 0}, /* minor 4-7 */
295 {0, 0, 0}, /* minor 8-11 */
296 {0, 0, 0} /* minor 12-15 */
297 }}},
298 #endif
299 {{T_SEQUENTIAL, T_REMOV,
300 "TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS, 0, {
301 {0, 0, 0}, /* minor 0-3 */
302 {0, 0, 0}, /* minor 4-7 */
303 {0, 0, 0}, /* minor 8-11 */
304 {0, 0, 0} /* minor 12-15 */
305 }}},
306 {{T_SEQUENTIAL, T_REMOV,
307 "OnStream", "ADR50 Drive", ""}, {ST_Q_UNIMODAL, 0, {
308 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
309 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 4-7 */
310 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 8-11 */
311 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 12-15 */
312 }}},
313 {{T_SEQUENTIAL, T_REMOV,
314 "OnStream DI-30", "", "1.0"}, {ST_Q_NOFILEMARKS, 0, {
315 {0, 0, 0}, /* minor 0-3 */
316 {0, 0, 0}, /* minor 4-7 */
317 {0, 0, 0}, /* minor 8-11 */
318 {0, 0, 0} /* minor 12-15 */
319 }}},
320 {{T_SEQUENTIAL, T_REMOV,
321 "NCR H621", "0-STD-03-46F880 ", ""}, {ST_Q_NOPREVENT, 0, {
322 {0, 0, 0}, /* minor 0-3 */
323 {0, 0, 0}, /* minor 4-7 */
324 {0, 0, 0}, /* minor 8-11 */
325 {0, 0, 0} /* minor 12-15 */
326 }}},
327 {{T_SEQUENTIAL, T_REMOV,
328 "Seagate STT3401A", "hp0atxa", ""}, {0, 0, {
329 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */
330 {ST_Q_FORCE_BLKSIZE, 1024, 0}, /* minor 4-7 */
331 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 8-11 */
332 {ST_Q_FORCE_BLKSIZE, 512, 0} /* minor 12-15 */
333 }}},
334 };
335
336 #define NOEJECT 0
337 #define EJECT 1
338
339 static void st_identify_drive(struct st_softc *,
340 struct scsipi_inquiry_pattern *);
341 static void st_loadquirks(struct st_softc *);
342 static int st_mount_tape(dev_t, int);
343 static void st_unmount(struct st_softc *, boolean);
344 static int st_decide_mode(struct st_softc *, boolean);
345 static void ststart(struct scsipi_periph *);
346 static int ststart1(struct scsipi_periph *, struct buf *, int *);
347 static void strestart(void *);
348 static void stdone(struct scsipi_xfer *, int);
349 static int st_read(struct st_softc *, char *, int, int);
350 static int st_space(struct st_softc *, int, u_int, int);
351 static int st_write_filemarks(struct st_softc *, int, int);
352 static int st_check_eod(struct st_softc *, boolean, int *, int);
353 static int st_load(struct st_softc *, u_int, int);
354 static int st_rewind(struct st_softc *, u_int, int);
355 static int st_interpret_sense(struct scsipi_xfer *);
356 static int st_touch_tape(struct st_softc *);
357 static int st_erase(struct st_softc *, int full, int flags);
358 static void st_updatefilepos(struct st_softc *);
359 static int st_rdpos(struct st_softc *, int, uint32_t *);
360 static int st_setpos(struct st_softc *, int, uint32_t *);
361
362 static const struct scsipi_periphsw st_switch = {
363 st_interpret_sense,
364 ststart,
365 NULL,
366 stdone
367 };
368
369 #if defined(ST_ENABLE_EARLYWARN)
370 #define ST_INIT_FLAGS ST_EARLYWARN
371 #else
372 #define ST_INIT_FLAGS 0
373 #endif
374
375 /*
376 * The routine called by the low level scsi routine when it discovers
377 * A device suitable for this driver
378 */
379 void
stattach(device_t parent,device_t self,void * aux)380 stattach(device_t parent, device_t self, void *aux)
381 {
382 struct st_softc *st = device_private(self);
383 struct scsipibus_attach_args *sa = aux;
384 struct scsipi_periph *periph = sa->sa_periph;
385
386 SC_DEBUG(periph, SCSIPI_DB2, ("stattach: "));
387 st->sc_dev = self;
388
389 /* Store information needed to contact our base driver */
390 st->sc_periph = periph;
391 periph->periph_dev = st->sc_dev;
392 periph->periph_switch = &st_switch;
393
394 /* Set initial flags */
395 st->flags = ST_INIT_FLAGS;
396
397 /* Set up the buf queues for this device */
398 bufq_alloc(&st->buf_queue, "fcfs", 0);
399 bufq_alloc(&st->buf_defer, "fcfs", 0);
400 callout_init(&st->sc_callout, 0);
401 mutex_init(&st->sc_iolock, MUTEX_DEFAULT, IPL_VM);
402
403 /*
404 * Check if the drive is a known criminal and take
405 * Any steps needed to bring it into line
406 */
407 st_identify_drive(st, &sa->sa_inqbuf);
408 aprint_naive("\n");
409 aprint_normal("\n");
410 /* Use the subdriver to request information regarding the drive. */
411 aprint_normal_dev(self, "%s", st->quirkdata ? "quirks apply, " : "");
412 if (scsipi_test_unit_ready(periph,
413 XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE) ||
414 st->ops(st, ST_OPS_MODESENSE,
415 XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE))
416 aprint_normal("drive empty\n");
417 else {
418 aprint_normal("density code %d, ", st->media_density);
419 if (st->media_blksize > 0)
420 aprint_normal("%d-byte", st->media_blksize);
421 else
422 aprint_normal("variable");
423 aprint_normal(" blocks, write-%s\n",
424 (st->flags & ST_READONLY) ? "protected" : "enabled");
425 }
426
427 st->stats = iostat_alloc(IOSTAT_TAPE, parent,
428 device_xname(st->sc_dev));
429
430 rnd_attach_source(&st->rnd_source, device_xname(st->sc_dev),
431 RND_TYPE_TAPE, RND_FLAG_DEFAULT);
432 }
433
434 int
stdetach(device_t self,int flags)435 stdetach(device_t self, int flags)
436 {
437 struct st_softc *st = device_private(self);
438 struct scsipi_periph *periph = st->sc_periph;
439 struct scsipi_channel *chan = periph->periph_channel;
440 int bmaj, cmaj, mn;
441
442 /* locate the major number */
443 bmaj = bdevsw_lookup_major(&st_bdevsw);
444 cmaj = cdevsw_lookup_major(&st_cdevsw);
445
446 /* kill any pending restart */
447 callout_halt(&st->sc_callout, NULL);
448
449 mutex_enter(chan_mtx(chan));
450
451 /* Kill off any queued buffers. */
452 bufq_drain(st->buf_defer);
453 bufq_drain(st->buf_queue);
454
455 /* Kill off any pending commands. */
456 scsipi_kill_pending(st->sc_periph);
457
458 mutex_exit(chan_mtx(chan));
459
460 bufq_free(st->buf_defer);
461 bufq_free(st->buf_queue);
462 mutex_destroy(&st->sc_iolock);
463
464 /* Nuke the vnodes for any open instances */
465 mn = STUNIT(device_unit(self));
466 vdevgone(bmaj, mn, mn+STNMINOR-1, VBLK);
467 vdevgone(cmaj, mn, mn+STNMINOR-1, VCHR);
468
469 iostat_free(st->stats);
470
471 /* Unhook the entropy source. */
472 rnd_detach_source(&st->rnd_source);
473
474 return 0;
475 }
476
477 /*
478 * Use the inquiry routine in 'scsi_base' to get drive info so we can
479 * Further tailor our behaviour.
480 */
481 static void
st_identify_drive(struct st_softc * st,struct scsipi_inquiry_pattern * inqbuf)482 st_identify_drive(struct st_softc *st, struct scsipi_inquiry_pattern *inqbuf)
483 {
484 const struct st_quirk_inquiry_pattern *finger;
485 int priority;
486
487 finger = scsipi_inqmatch(inqbuf,
488 st_quirk_patterns,
489 sizeof(st_quirk_patterns) / sizeof(st_quirk_patterns[0]),
490 sizeof(st_quirk_patterns[0]), &priority);
491 if (priority != 0) {
492 st->quirkdata = &finger->quirkdata;
493 st->drive_quirks = finger->quirkdata.quirks;
494 st->quirks = finger->quirkdata.quirks; /* start value */
495 st->page_0_size = finger->quirkdata.page_0_size;
496 KASSERT(st->page_0_size <= MAX_PAGE_0_SIZE);
497 st_loadquirks(st);
498 }
499 }
500
501 /*
502 * initialise the subdevices to the default (QUIRK) state.
503 * this will remove any setting made by the system operator or previous
504 * operations.
505 */
506 static void
st_loadquirks(struct st_softc * st)507 st_loadquirks(struct st_softc *st)
508 {
509 const struct modes *mode;
510 struct modes *mode2;
511 int i;
512
513 mode = st->quirkdata->modes;
514 mode2 = st->modes;
515 for (i = 0; i < 4; i++) {
516 memset(mode2, 0, sizeof(struct modes));
517 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK |
518 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER |
519 DENSITY_SET_BY_USER);
520 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) {
521 mode2->blksize = mode->blksize;
522 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK;
523 }
524 if (mode->density) {
525 mode2->density = mode->density;
526 st->modeflags[i] |= DENSITY_SET_BY_QUIRK;
527 }
528 mode2->quirks |= mode->quirks;
529 mode++;
530 mode2++;
531 }
532 }
533
534 /* open the device. */
535 static int
stopen(dev_t dev,int flags,int mode,struct lwp * l)536 stopen(dev_t dev, int flags, int mode, struct lwp *l)
537 {
538 u_int stmode, dsty;
539 int error, sflags, unit, tries, ntries;
540 struct st_softc *st;
541 struct scsipi_periph *periph;
542 struct scsipi_adapter *adapt;
543
544 unit = STUNIT(dev);
545 st = device_lookup_private(&st_cd, unit);
546 if (st == NULL)
547 return ENXIO;
548
549 stmode = STMODE(dev);
550 dsty = STDSTY(dev);
551
552 periph = st->sc_periph;
553 adapt = periph->periph_channel->chan_adapter;
554
555 SC_DEBUG(periph, SCSIPI_DB1,
556 ("open: dev=0x%"PRIx64" (unit %d (of %d))\n", dev, unit,
557 st_cd.cd_ndevs));
558
559 /* Only allow one at a time */
560 if (periph->periph_flags & PERIPH_OPEN) {
561 aprint_error_dev(st->sc_dev, "already open\n");
562 return EBUSY;
563 }
564
565 if ((error = scsipi_adapter_addref(adapt)) != 0)
566 return error;
567
568 /* clear any latched errors. */
569 st->mt_resid = 0;
570 st->mt_erreg = 0;
571 st->asc = 0;
572 st->ascq = 0;
573
574 /*
575 * Catch any unit attention errors. Be silent about this
576 * unless we're already mounted. We ignore media change
577 * if we're in control mode or not mounted yet.
578 */
579 if ((st->flags & ST_MOUNTED) == 0 || stmode == CTRL_MODE) {
580 #ifdef SCSIDEBUG
581 sflags = XS_CTL_IGNORE_MEDIA_CHANGE;
582 #else
583 sflags = XS_CTL_SILENT|XS_CTL_IGNORE_MEDIA_CHANGE;
584 #endif
585 } else
586 sflags = 0;
587
588 /*
589 * If we're already mounted or we aren't configured for
590 * a mount delay, only try a test unit ready once. Otherwise,
591 * try up to ST_MOUNT_DELAY times with a rest interval of
592 * one second between each try.
593 */
594 if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0)
595 ntries = 1;
596 else
597 ntries = ST_MOUNT_DELAY;
598
599 for (error = tries = 0; tries < ntries; tries++) {
600 int slpintr, oflags;
601
602 /*
603 * If we had no error, or we're opening the control mode
604 * device, we jump out right away.
605 */
606 error = scsipi_test_unit_ready(periph, sflags);
607 if (error == 0 || stmode == CTRL_MODE)
608 break;
609
610 /*
611 * We had an error.
612 *
613 * If we're already mounted or we aren't configured for
614 * a mount delay, or the error isn't a NOT READY error,
615 * skip to the error exit now.
616 */
617 if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0 ||
618 (st->mt_key != SKEY_NOT_READY)) {
619 device_printf(st->sc_dev,
620 "mount error (sense key=%d) - "
621 "terminating mount session\n",
622 st->mt_key);
623 /*
624 * the following should not trigger unless
625 * something serious happened while the device
626 * was open (PREVENT MEDIUM REMOVAL in effect)
627 */
628 if (st->flags & ST_WRITTEN &&
629 st->mt_key == SKEY_UNIT_ATTENTION) {
630 /*
631 * device / media state may have changed
632 * refrain from writing missing file marks
633 * onto potentially newly inserted/formatted
634 * media (e. g. emergency EJECT/RESET/etc.)
635 */
636 st->flags &= ~(ST_WRITTEN|ST_FM_WRITTEN);
637
638 device_printf(st->sc_dev,
639 "CAUTION: file marks/data may be missing"
640 " - ASC = 0x%02x, ASCQ = 0x%02x\n",
641 st->asc, st->ascq);
642 }
643 goto bad;
644 }
645
646 /* clear any latched errors. */
647 st->mt_resid = 0;
648 st->mt_erreg = 0;
649 st->asc = 0;
650 st->ascq = 0;
651
652 /*
653 * Fake that we have the device open so
654 * we block other apps from getting in.
655 */
656 oflags = periph->periph_flags;
657 periph->periph_flags |= PERIPH_OPEN;
658
659 slpintr = kpause("stload", true, hz, NULL);
660
661 periph->periph_flags = oflags; /* restore flags */
662 if (slpintr != 0 && slpintr != EWOULDBLOCK) {
663 device_printf(st->sc_dev, "load interrupted\n");
664 goto bad;
665 }
666 }
667
668 /*
669 * If the mode is 3 (e.g. minor = 3,7,11,15) then the device has
670 * been opened to set defaults and perform other, usually non-I/O
671 * related, operations. In this case, do a quick check to see
672 * whether the unit actually had a tape loaded (this will be known
673 * as to whether or not we got a NOT READY for the above
674 * unit attention). If a tape is there, go do a mount sequence.
675 */
676 if (stmode == CTRL_MODE &&
677 st->mt_key != SKEY_NO_SENSE &&
678 st->mt_key != SKEY_UNIT_ATTENTION) {
679 periph->periph_flags |= PERIPH_OPEN;
680 return 0;
681 }
682
683 /*
684 * If we get this far and had an error set, that means we failed
685 * to pass the 'test unit ready' test for the non-controlmode device,
686 * so we bounce the open.
687 */
688 if (error)
689 return error;
690
691 /* Else, we're now committed to saying we're open. */
692 periph->periph_flags |= PERIPH_OPEN; /* unit attn are now errors */
693
694 /*
695 * If it's a different mode, or if the media has been
696 * invalidated, unmount the tape from the previous
697 * session but continue with open processing
698 */
699 if (st->last_dsty != dsty ||
700 (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)
701 st_unmount(st, NOEJECT);
702
703 /*
704 * If we are not mounted, then we should start a new
705 * mount session.
706 */
707 if (!(st->flags & ST_MOUNTED)) {
708 if ((error = st_mount_tape(dev, flags)) != 0)
709 goto bad;
710 st->last_dsty = dsty;
711 }
712 if (!(st->quirks & ST_Q_NOPREVENT)) {
713 scsipi_prevent(periph, SPAMR_PREVENT_DT,
714 XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY);
715 }
716
717 SC_DEBUG(periph, SCSIPI_DB2, ("open complete\n"));
718 return 0;
719
720 bad:
721 st_unmount(st, NOEJECT);
722 scsipi_adapter_delref(adapt);
723 periph->periph_flags &= ~PERIPH_OPEN;
724 return error;
725 }
726
727 static int
stclose(dev_t dev,int flags,int mode,struct lwp * l)728 stclose(dev_t dev, int flags, int mode, struct lwp *l)
729 {
730 int stxx, error = 0;
731 struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev));
732 struct scsipi_periph *periph = st->sc_periph;
733 struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter;
734
735 SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("closing\n"));
736
737 /*
738 * Make sure that a tape opened in write-only mode will have
739 * file marks written on it when closed, even if not written to.
740 *
741 * This is for SUN compatibility. Actually, the Sun way of
742 * things is to:
743 *
744 * only write filemarks if there are fmks to be written and
745 * - open for write (possibly read/write)
746 * - the last operation was a write
747 * or:
748 * - opened for wronly
749 * - no data was written (including filemarks)
750 */
751
752 stxx = st->flags & (ST_WRITTEN | ST_FM_WRITTEN);
753 if ((flags & FWRITE) != 0) {
754 int nm = 0;
755 #ifdef ST_SUNCOMPAT
756 /*
757 * on request only
758 * original compat code has not been working
759 * since ~1998
760 */
761 if ((flags & O_ACCMODE) == FWRITE && (stxx == 0)) {
762 st->flags |= ST_WRITTEN;
763 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
764 ("SUN compatibility: write FM(s) at close\n"));
765 }
766 #endif
767 error = st_check_eod(st, FALSE, &nm, 0);
768 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
769 ("wrote %d FM(s) at close error=%d\n", nm, error));
770 }
771
772 /* Allow robots to eject tape if needed. */
773 if (!(st->quirks & ST_Q_NOPREVENT)) {
774 scsipi_prevent(periph, SPAMR_ALLOW,
775 XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY);
776 }
777
778 switch (STMODE(dev)) {
779 case NORMAL_MODE:
780 st_unmount(st, NOEJECT);
781 break;
782 case NOREW_MODE:
783 case CTRL_MODE:
784 /*
785 * Leave mounted unless media seems to have been removed.
786 *
787 * Otherwise, if we're to terminate a tape with more than one
788 * filemark [ and because we're not rewinding here ], backspace
789 * one filemark so that later appends will see an unbroken
790 * sequence of:
791 *
792 * file - FMK - file - FMK ... file - FMK FMK (EOM)
793 */
794 if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) {
795 st_unmount(st, NOEJECT);
796 } else if (error == 0) {
797 /*
798 * ST_WRITTEN was preserved from above.
799 *
800 * All we need to know here is:
801 *
802 * Were we writing this tape and was the last
803 * operation a write?
804 *
805 * Are there supposed to be 2FM at EOD?
806 *
807 * If both statements are true, then we backspace
808 * one filemark.
809 */
810 stxx &= ~ST_FM_WRITTEN;
811 stxx |= (st->flags & ST_2FM_AT_EOD);
812 if ((flags & FWRITE) != 0 &&
813 (stxx == (ST_2FM_AT_EOD|ST_WRITTEN))) {
814 error = st_space(st, -1, SP_FILEMARKS, 0);
815 SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("st_space(-1) error=%d\n", error));
816 } else {
817 SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("no backspacing - flags = 0x%x, stxx=0x%x, st->flags=0x%x\n", flags, stxx, st->flags));
818 }
819 } else {
820 SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("error %d from st_check_eod\n", error));
821 }
822
823 break;
824 case EJECT_MODE:
825 st_unmount(st, EJECT);
826 break;
827 }
828
829 KASSERTMSG((st->flags & ST_WRITTEN) == 0,
830 "pending ST_WRITTEN flag NOT cleared (flags=0x%x)", st->flags);
831
832 scsipi_wait_drain(periph);
833
834 scsipi_adapter_delref(adapt);
835 periph->periph_flags &= ~PERIPH_OPEN;
836
837 return error;
838 }
839
840 /*
841 * Start a new mount session.
842 * Copy in all the default parameters from the selected device mode.
843 * and try guess any that seem to be defaulted.
844 */
845 static int
st_mount_tape(dev_t dev,int flags)846 st_mount_tape(dev_t dev, int flags)
847 {
848 int unit;
849 u_int dsty;
850 struct st_softc *st;
851 struct scsipi_periph *periph;
852 int error = 0;
853
854 unit = STUNIT(dev);
855 dsty = STDSTY(dev);
856 st = device_lookup_private(&st_cd, unit);
857 periph = st->sc_periph;
858
859 if (st->flags & ST_MOUNTED)
860 return 0;
861
862 SC_DEBUG(periph, SCSIPI_DB1, ("mounting\n "));
863 st->flags |= ST_NEW_MOUNT;
864 st->quirks = st->drive_quirks | st->modes[dsty].quirks;
865 /*
866 * If the media is new, then make sure we give it a chance to
867 * to do a 'load' instruction. (We assume it is new.)
868 */
869 if ((error = st_load(st, LD_LOAD, XS_CTL_SILENT)) != 0)
870 return error;
871 /*
872 * Throw another dummy instruction to catch
873 * 'Unit attention' errors. Many drives give
874 * these after doing a Load instruction (with
875 * the MEDIUM MAY HAVE CHANGED asc/ascq).
876 */
877 scsipi_test_unit_ready(periph, XS_CTL_SILENT); /* XXX */
878
879 /*
880 * Some devices can't tell you much until they have been
881 * asked to look at the media. This quirk does this.
882 */
883 if (st->quirks & ST_Q_SENSE_HELP)
884 if ((error = st_touch_tape(st)) != 0)
885 return error;
886 /*
887 * Load the physical device parameters
888 * loads: blkmin, blkmax
889 */
890 if ((error = st->ops(st, ST_OPS_RBL, 0)) != 0)
891 return error;
892 /*
893 * Load the media dependent parameters
894 * includes: media_blksize,media_density,numblks
895 * As we have a tape in, it should be reflected here.
896 * If not you may need the "quirk" above.
897 */
898 if ((error = st->ops(st, ST_OPS_MODESENSE, 0)) != 0)
899 return error;
900 /*
901 * If we have gained a permanent density from somewhere,
902 * then use it in preference to the one supplied by
903 * default by the driver.
904 */
905 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER))
906 st->density = st->modes[dsty].density;
907 else
908 st->density = st->media_density;
909 /*
910 * If we have gained a permanent blocksize
911 * then use it in preference to the one supplied by
912 * default by the driver.
913 */
914 st->flags &= ~ST_FIXEDBLOCKS;
915 if (st->modeflags[dsty] &
916 (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) {
917 st->blksize = st->modes[dsty].blksize;
918 if (st->blksize)
919 st->flags |= ST_FIXEDBLOCKS;
920 } else {
921 if ((error = st_decide_mode(st, FALSE)) != 0)
922 return error;
923 }
924 if ((error = st->ops(st, ST_OPS_MODESELECT, 0)) != 0) {
925 /* ATAPI will return ENODEV for this, and this may be OK */
926 if (error != ENODEV) {
927 aprint_error_dev(st->sc_dev,
928 "cannot set selected mode\n");
929 return error;
930 }
931 }
932 st->flags &= ~ST_NEW_MOUNT;
933 st->flags |= ST_MOUNTED;
934 periph->periph_flags |= PERIPH_MEDIA_LOADED; /* move earlier? */
935 st->blkno = st->fileno = (daddr_t) 0;
936 return 0;
937 }
938
939 /*
940 * End the present mount session.
941 * Rewind, and optionally eject the tape.
942 * Reset various flags to indicate that all new
943 * operations require another mount operation
944 */
945 static void
st_unmount(struct st_softc * st,boolean eject)946 st_unmount(struct st_softc *st, boolean eject)
947 {
948 struct scsipi_periph *periph = st->sc_periph;
949 int nmarks;
950
951 if ((st->flags & ST_MOUNTED) == 0)
952 return;
953 SC_DEBUG(periph, SCSIPI_DB1, ("unmounting\n"));
954 st_check_eod(st, FALSE, &nmarks, XS_CTL_IGNORE_NOT_READY);
955 st_rewind(st, 0, XS_CTL_IGNORE_NOT_READY);
956
957 /*
958 * Section 9.3.3 of the SCSI specs states that a device shall return
959 * the density value specified in the last successful MODE SELECT
960 * after an unload operation, in case it is not able to
961 * automatically determine the density of the new medium.
962 *
963 * So we instruct the device to use the default density, which will
964 * prevent the use of stale density values (in particular,
965 * in st_touch_tape().
966 */
967 st->density = 0;
968 if (st->ops(st, ST_OPS_MODESELECT, 0) != 0) {
969 aprint_error_dev(st->sc_dev,
970 "WARNING: cannot revert to default density\n");
971 }
972
973 if (eject) {
974 if (!(st->quirks & ST_Q_NOPREVENT)) {
975 scsipi_prevent(periph, SPAMR_ALLOW,
976 XS_CTL_IGNORE_ILLEGAL_REQUEST |
977 XS_CTL_IGNORE_NOT_READY);
978 }
979 st_load(st, LD_UNLOAD, XS_CTL_IGNORE_NOT_READY);
980 st->blkno = st->fileno = (daddr_t) -1;
981 } else {
982 st->blkno = st->fileno = (daddr_t) 0;
983 }
984 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT);
985 periph->periph_flags &= ~PERIPH_MEDIA_LOADED;
986 }
987
988 /*
989 * Given all we know about the device, media, mode, 'quirks' and
990 * initial operation, make a decision as to how we should be set
991 * to run (regarding blocking and EOD marks)
992 */
993 int
st_decide_mode(struct st_softc * st,boolean first_read)994 st_decide_mode(struct st_softc *st, boolean first_read)
995 {
996
997 SC_DEBUG(st->sc_periph, SCSIPI_DB2, ("starting block mode decision\n"));
998
999 /*
1000 * If the drive can only handle fixed-length blocks and only at
1001 * one size, perhaps we should just do that.
1002 */
1003 if (st->blkmin && (st->blkmin == st->blkmax)) {
1004 st->flags |= ST_FIXEDBLOCKS;
1005 st->blksize = st->blkmin;
1006 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
1007 ("blkmin == blkmax of %d\n", st->blkmin));
1008 goto done;
1009 }
1010 /*
1011 * If the tape density mandates (or even suggests) use of fixed
1012 * or variable-length blocks, comply.
1013 */
1014 switch (st->density) {
1015 case HALFINCH_800:
1016 case HALFINCH_1600:
1017 case HALFINCH_6250:
1018 case DDS:
1019 st->flags &= ~ST_FIXEDBLOCKS;
1020 st->blksize = 0;
1021 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
1022 ("density specified variable\n"));
1023 goto done;
1024 case QIC_11:
1025 case QIC_24:
1026 case QIC_120:
1027 case QIC_150:
1028 case QIC_525:
1029 case QIC_1320:
1030 case QIC_3095:
1031 case QIC_3220:
1032 st->flags |= ST_FIXEDBLOCKS;
1033 if (st->media_blksize > 0)
1034 st->blksize = st->media_blksize;
1035 else
1036 st->blksize = DEF_FIXED_BSIZE;
1037 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
1038 ("density specified fixed\n"));
1039 goto done;
1040 }
1041 /*
1042 * If we're about to read the tape, perhaps we should choose
1043 * fixed or variable-length blocks and block size according to
1044 * what the drive found on the tape.
1045 */
1046 if (first_read &&
1047 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) ||
1048 (st->media_blksize == DEF_FIXED_BSIZE) ||
1049 (st->media_blksize == 1024))) {
1050 if (st->media_blksize > 0)
1051 st->flags |= ST_FIXEDBLOCKS;
1052 else
1053 st->flags &= ~ST_FIXEDBLOCKS;
1054 st->blksize = st->media_blksize;
1055 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
1056 ("Used media_blksize of %d\n", st->media_blksize));
1057 goto done;
1058 }
1059 /*
1060 * We're getting no hints from any direction. Choose variable-
1061 * length blocks arbitrarily.
1062 */
1063 st->flags &= ~ST_FIXEDBLOCKS;
1064 st->blksize = 0;
1065 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
1066 ("Give up and default to variable mode\n"));
1067
1068 done:
1069 /*
1070 * Decide whether or not to write two file marks to signify end-
1071 * of-data. Make the decision as a function of density. If
1072 * the decision is not to use a second file mark, the SCSI BLANK
1073 * CHECK condition code will be recognized as end-of-data when
1074 * first read.
1075 * (I think this should be a by-product of fixed/variable..julian)
1076 */
1077 switch (st->density) {
1078 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */
1079 case QIC_11:
1080 case QIC_24:
1081 case QIC_120:
1082 case QIC_150:
1083 case QIC_525:
1084 case QIC_1320:
1085 case QIC_3095:
1086 case QIC_3220:
1087 st->flags &= ~ST_2FM_AT_EOD;
1088 break;
1089 default:
1090 st->flags |= ST_2FM_AT_EOD;
1091 }
1092 return 0;
1093 }
1094
1095 /*
1096 * Actually translate the requested transfer into
1097 * one the physical driver can understand
1098 * The transfer is described by a buf and will include
1099 * only one physical transfer.
1100 */
1101 static void
ststrategy(struct buf * bp)1102 ststrategy(struct buf *bp)
1103 {
1104 struct st_softc *st = device_lookup_private(&st_cd, STUNIT(bp->b_dev));
1105 struct scsipi_periph *periph = st->sc_periph;
1106 struct scsipi_channel *chan = periph->periph_channel;
1107
1108 SC_DEBUG(periph, SCSIPI_DB1,
1109 ("ststrategy %d bytes @ blk %" PRId64 "\n", bp->b_bcount,
1110 bp->b_blkno));
1111 /* If it's a null transfer, return immediately */
1112 if (bp->b_bcount == 0)
1113 goto abort;
1114
1115 /* If offset is negative, error */
1116 if (bp->b_blkno < 0) {
1117 SC_DEBUG(periph, SCSIPI_DB3,
1118 ("EINVAL: ststrategy negative blockcount %" PRId64 "\n", bp->b_blkno));
1119 bp->b_error = EINVAL;
1120 goto abort;
1121 }
1122
1123 /* Odd sized request on fixed drives are verboten */
1124 if (st->flags & ST_FIXEDBLOCKS) {
1125 if (bp->b_bcount % st->blksize) {
1126 aprint_error_dev(st->sc_dev, "bad request, must be multiple of %d\n",
1127 st->blksize);
1128 bp->b_error = EIO;
1129 goto abort;
1130 }
1131 }
1132 /* as are out-of-range requests on variable drives. */
1133 else if (bp->b_bcount < st->blkmin ||
1134 (st->blkmax && bp->b_bcount > st->blkmax)) {
1135 aprint_error_dev(st->sc_dev, "bad request, must be between %d and %d\n",
1136 st->blkmin, st->blkmax);
1137 bp->b_error = EIO;
1138 goto abort;
1139 }
1140 mutex_enter(chan_mtx(chan));
1141
1142 /*
1143 * Place it in the queue of activities for this tape
1144 * at the end (a bit silly because we only have on user..
1145 * (but it could fork()))
1146 */
1147 bufq_put(st->buf_queue, bp);
1148
1149 /*
1150 * Tell the device to get going on the transfer if it's
1151 * not doing anything, otherwise just wait for completion
1152 * (All a bit silly if we're only allowing 1 open but..)
1153 */
1154 ststart(periph);
1155
1156 mutex_exit(chan_mtx(chan));
1157 return;
1158 abort:
1159 /*
1160 * Reset the residue because we didn't do anything,
1161 * and send the buffer back as done.
1162 */
1163 bp->b_resid = bp->b_bcount;
1164 biodone(bp);
1165 return;
1166 }
1167
1168 /*
1169 * ststart looks to see if there is a buf waiting for the device
1170 * and that the device is not already busy. If the device is busy,
1171 * the request is deferred and retried on the next attempt.
1172 * If both are true, ststart creates a scsi command to perform
1173 * the transfer required.
1174 *
1175 * The transfer request will call scsipi_done on completion,
1176 * which will in turn call this routine again so that the next
1177 * queued transfer is performed. The bufs are queued by the
1178 * strategy routine (ststrategy)
1179 *
1180 * This routine is also called after other non-queued requests
1181 * have been made of the scsi driver, to ensure that the queue
1182 * continues to be drained.
1183 * ststart() is called with channel lock held
1184 */
1185 static int
ststart1(struct scsipi_periph * periph,struct buf * bp,int * errnop)1186 ststart1(struct scsipi_periph *periph, struct buf *bp, int *errnop)
1187 {
1188 struct st_softc *st = device_private(periph->periph_dev);
1189 struct scsipi_channel *chan = periph->periph_channel;
1190 struct scsi_rw_tape cmd;
1191 struct scsipi_xfer *xs;
1192 int flags, error, complete = 1;
1193
1194 SC_DEBUG(periph, SCSIPI_DB2, ("ststart1 "));
1195
1196 mutex_enter(chan_mtx(chan));
1197
1198 if (periph->periph_active >= periph->periph_openings) {
1199 error = EAGAIN;
1200 goto out;
1201 }
1202
1203 /* if a special awaits, let it proceed first */
1204 if (periph->periph_flags & PERIPH_WAITING) {
1205 periph->periph_flags &= ~PERIPH_WAITING;
1206 cv_broadcast(periph_cv_periph(periph));
1207 error = EAGAIN;
1208 goto out;
1209 }
1210
1211 /*
1212 * If the device has been unmounted by the user
1213 * then throw away all requests until done.
1214 */
1215 if (__predict_false((st->flags & ST_MOUNTED) == 0 ||
1216 (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)) {
1217 error = EIO;
1218 goto out;
1219 }
1220
1221 /*
1222 * only FIXEDBLOCK devices have pending I/O or space operations.
1223 */
1224 if (st->flags & ST_FIXEDBLOCKS) {
1225 /*
1226 * If we are at a filemark but have not reported it yet
1227 * then we should report it now
1228 */
1229 if (st->flags & ST_AT_FILEMARK) {
1230 if ((bp->b_flags & B_READ) == B_WRITE) {
1231 /*
1232 * Handling of ST_AT_FILEMARK in
1233 * st_space will fill in the right file
1234 * mark count.
1235 * Back up over filemark
1236 */
1237 if (st_space(st, 0, SP_FILEMARKS, 0)) {
1238 error = EIO;
1239 goto out;
1240 }
1241 } else {
1242 error = 0;
1243 st->flags &= ~ST_AT_FILEMARK;
1244 goto out;
1245 }
1246 }
1247 }
1248 /*
1249 * If we are at EOM but have not reported it
1250 * yet then we should report it now.
1251 */
1252 if (st->flags & (ST_EOM_PENDING|ST_EIO_PENDING)) {
1253 error = 0;
1254 if (st->flags & ST_EIO_PENDING)
1255 error = EIO;
1256 st->flags &= ~(ST_EOM_PENDING|ST_EIO_PENDING);
1257 goto out;
1258 }
1259
1260 /* Fill out the scsi command */
1261 memset(&cmd, 0, sizeof(cmd));
1262 flags = XS_CTL_NOSLEEP | XS_CTL_ASYNC;
1263 if ((bp->b_flags & B_READ) == B_WRITE) {
1264 cmd.opcode = WRITE;
1265 st->flags &= ~ST_FM_WRITTEN;
1266 flags |= XS_CTL_DATA_OUT;
1267 } else {
1268 cmd.opcode = READ;
1269 flags |= XS_CTL_DATA_IN;
1270 }
1271
1272 /*
1273 * Handle "fixed-block-mode" tape drives by using the
1274 * block count instead of the length.
1275 */
1276 if (st->flags & ST_FIXEDBLOCKS) {
1277 cmd.byte2 |= SRW_FIXED;
1278 _lto3b(bp->b_bcount / st->blksize, cmd.len);
1279 } else
1280 _lto3b(bp->b_bcount, cmd.len);
1281
1282 /* Clear 'position updated' indicator */
1283 st->flags &= ~ST_POSUPDATED;
1284
1285 /* go ask the adapter to do all this for us */
1286 xs = scsipi_make_xs_locked(periph,
1287 (struct scsipi_generic *)&cmd, sizeof(cmd),
1288 (u_char *)bp->b_data, bp->b_bcount,
1289 0, ST_IO_TIME, bp, flags);
1290 if (__predict_false(xs == NULL)) {
1291 /*
1292 * out of memory. Keep this buffer in the queue, and
1293 * retry later.
1294 */
1295 callout_reset(&st->sc_callout, hz / 2, strestart,
1296 periph);
1297 error = EAGAIN;
1298 goto out;
1299 }
1300
1301 error = scsipi_execute_xs(xs);
1302 /* with a scsipi_xfer preallocated, scsipi_command can't fail */
1303 KASSERT(error == 0);
1304 if (error == 0)
1305 complete = 0;
1306
1307 out:
1308 mutex_exit(chan_mtx(chan));
1309
1310 *errnop = error;
1311 return complete;
1312 }
1313
1314 static void
ststart(struct scsipi_periph * periph)1315 ststart(struct scsipi_periph *periph)
1316 {
1317 struct st_softc *st = device_private(periph->periph_dev);
1318 struct scsipi_channel *chan = periph->periph_channel;
1319 struct buf *bp;
1320 int error, complete;
1321
1322 SC_DEBUG(periph, SCSIPI_DB2, ("ststart "));
1323
1324 mutex_exit(chan_mtx(chan));
1325 mutex_enter(&st->sc_iolock);
1326
1327 while ((bp = bufq_get(st->buf_defer)) != NULL
1328 || (bp = bufq_get(st->buf_queue)) != NULL) {
1329
1330 iostat_busy(st->stats);
1331 mutex_exit(&st->sc_iolock);
1332
1333 complete = ststart1(periph, bp, &error);
1334
1335 mutex_enter(&st->sc_iolock);
1336 if (complete) {
1337 iostat_unbusy(st->stats, 0,
1338 ((bp->b_flags & B_READ) == B_READ));
1339 if (error == EAGAIN) {
1340 bufq_put(st->buf_defer, bp);
1341 break;
1342 }
1343 }
1344 mutex_exit(&st->sc_iolock);
1345
1346 if (complete) {
1347 bp->b_error = error;
1348 bp->b_resid = bp->b_bcount;
1349 biodone(bp);
1350 }
1351
1352 mutex_enter(&st->sc_iolock);
1353 }
1354
1355 mutex_exit(&st->sc_iolock);
1356 mutex_enter(chan_mtx(chan));
1357 }
1358
1359 static void
strestart(void * v)1360 strestart(void *v)
1361 {
1362 struct scsipi_periph *periph = (struct scsipi_periph *)v;
1363 struct scsipi_channel *chan = periph->periph_channel;
1364
1365 mutex_enter(chan_mtx(chan));
1366 ststart((struct scsipi_periph *)v);
1367 mutex_exit(chan_mtx(chan));
1368 }
1369
1370 static void
stdone(struct scsipi_xfer * xs,int error)1371 stdone(struct scsipi_xfer *xs, int error)
1372 {
1373 struct st_softc *st = device_private(xs->xs_periph->periph_dev);
1374 struct buf *bp = xs->bp;
1375
1376 if (bp) {
1377 bp->b_error = error;
1378 bp->b_resid = xs->resid;
1379 /*
1380 * buggy device ? A SDLT320 can report an info
1381 * field of 0x3de8000 on a Media Error/Write Error
1382 * for this CBD: 0x0a 00 00 80 00 00
1383 */
1384 if (bp->b_resid > bp->b_bcount || bp->b_resid < 0)
1385 bp->b_resid = bp->b_bcount;
1386
1387 mutex_enter(&st->sc_iolock);
1388
1389 if ((bp->b_flags & B_READ) == B_WRITE)
1390 st->flags |= ST_WRITTEN;
1391 else
1392 st->flags &= ~ST_WRITTEN;
1393
1394 iostat_unbusy(st->stats, bp->b_bcount,
1395 ((bp->b_flags & B_READ) == B_READ));
1396
1397 if ((st->flags & ST_POSUPDATED) == 0) {
1398 if (error) {
1399 st->fileno = st->blkno = -1;
1400 } else if (st->blkno != -1) {
1401 if (st->flags & ST_FIXEDBLOCKS)
1402 st->blkno +=
1403 (bp->b_bcount / st->blksize);
1404 else
1405 st->blkno++;
1406 }
1407 }
1408
1409 mutex_exit(&st->sc_iolock);
1410
1411 rnd_add_uint32(&st->rnd_source, bp->b_blkno);
1412
1413 biodone(bp);
1414 }
1415 }
1416
1417 static int
stread(dev_t dev,struct uio * uio,int iomode)1418 stread(dev_t dev, struct uio *uio, int iomode)
1419 {
1420 struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev));
1421
1422 int r = physio(ststrategy, NULL, dev, B_READ,
1423 st->sc_periph->periph_channel->chan_adapter->adapt_minphys, uio);
1424
1425 SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[stread: result=%d]\n", r));
1426
1427 return r;
1428 }
1429
1430 static int
stwrite(dev_t dev,struct uio * uio,int iomode)1431 stwrite(dev_t dev, struct uio *uio, int iomode)
1432 {
1433 struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev));
1434
1435 int r = physio(ststrategy, NULL, dev, B_WRITE,
1436 st->sc_periph->periph_channel->chan_adapter->adapt_minphys, uio);
1437
1438 SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[stwrite: result=%d]\n", r));
1439
1440 return r;
1441 }
1442
1443 /*
1444 * Perform special action on behalf of the user;
1445 * knows about the internals of this device
1446 */
1447 static int
stioctl(dev_t dev,u_long cmd,void * arg,int flag,struct lwp * l)1448 stioctl(dev_t dev, u_long cmd, void *arg, int flag, struct lwp *l)
1449 {
1450 int error = 0;
1451 int unit;
1452 int number, nmarks, dsty;
1453 int flags;
1454 struct st_softc *st;
1455 int hold_blksize;
1456 uint8_t hold_density;
1457 struct mtop *mt = (struct mtop *) arg;
1458
1459 /* Find the device that the user is talking about */
1460 flags = 0; /* give error messages, act on errors etc. */
1461 unit = STUNIT(dev);
1462 dsty = STDSTY(dev);
1463 st = device_lookup_private(&st_cd, unit);
1464 hold_blksize = st->blksize;
1465 hold_density = st->density;
1466
1467 switch ((u_int)cmd) {
1468 case MTIOCGET: {
1469 struct mtget *g = (struct mtget *) arg;
1470 /*
1471 * (to get the current state of READONLY)
1472 */
1473 error = st->ops(st, ST_OPS_MODESENSE, XS_CTL_SILENT);
1474 if (error) {
1475 /*
1476 * Ignore the error if in control mode;
1477 * this is mandated by st(4).
1478 */
1479 if (STMODE(dev) != CTRL_MODE)
1480 break;
1481 error = 0;
1482 }
1483 SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[ioctl: get status]\n"));
1484 memset(g, 0, sizeof(struct mtget));
1485 g->mt_type = MT_ISAR; /* Ultrix compat *//*? */
1486 g->mt_blksiz = st->blksize;
1487 g->mt_density = st->density;
1488 g->mt_mblksiz[0] = st->modes[0].blksize;
1489 g->mt_mblksiz[1] = st->modes[1].blksize;
1490 g->mt_mblksiz[2] = st->modes[2].blksize;
1491 g->mt_mblksiz[3] = st->modes[3].blksize;
1492 g->mt_mdensity[0] = st->modes[0].density;
1493 g->mt_mdensity[1] = st->modes[1].density;
1494 g->mt_mdensity[2] = st->modes[2].density;
1495 g->mt_mdensity[3] = st->modes[3].density;
1496 g->mt_fileno = st->fileno;
1497 g->mt_blkno = st->blkno;
1498 if (st->flags & ST_READONLY)
1499 g->mt_dsreg |= MT_DS_RDONLY;
1500 if (st->flags & ST_MOUNTED)
1501 g->mt_dsreg |= MT_DS_MOUNTED;
1502 g->mt_resid = st->mt_resid;
1503 g->mt_erreg = st->mt_erreg;
1504 /*
1505 * clear latched errors.
1506 */
1507 st->mt_resid = 0;
1508 st->mt_erreg = 0;
1509 st->asc = 0;
1510 st->ascq = 0;
1511 break;
1512 }
1513 case MTIOCTOP: {
1514 SC_DEBUG(st->sc_periph, SCSIPI_DB1,
1515 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op,
1516 mt->mt_count));
1517
1518 /* compat: in U*x it is a short */
1519 number = mt->mt_count;
1520 switch ((short) (mt->mt_op)) {
1521 case MTWEOF: /* write an end-of-file record */
1522 error = st_write_filemarks(st, number, flags);
1523 break;
1524 case MTBSF: /* backward space file */
1525 number = -number;
1526 /* FALLTHROUGH */
1527 case MTFSF: /* forward space file */
1528 error = st_check_eod(st, FALSE, &nmarks, flags);
1529 if (!error)
1530 error = st_space(st, number - nmarks,
1531 SP_FILEMARKS, flags);
1532 break;
1533 case MTBSR: /* backward space record */
1534 number = -number;
1535 /* FALLTHROUGH */
1536 case MTFSR: /* forward space record */
1537 error = st_check_eod(st, true, &nmarks, flags);
1538 if (!error)
1539 error = st_space(st, number, SP_BLKS, flags);
1540 break;
1541 case MTREW: /* rewind */
1542 error = st_rewind(st, 0, flags);
1543 break;
1544 case MTOFFL: /* rewind and put the drive offline */
1545 st_unmount(st, EJECT);
1546 break;
1547 case MTNOP: /* no operation, sets status only */
1548 break;
1549 case MTRETEN: /* retension the tape */
1550 error = st_load(st, LD_RETENSION, flags);
1551 if (!error)
1552 error = st_load(st, LD_LOAD, flags);
1553 break;
1554 case MTEOM: /* forward space to end of media */
1555 error = st_check_eod(st, FALSE, &nmarks, flags);
1556 if (!error)
1557 error = st_space(st, 1, SP_EOM, flags);
1558 break;
1559 case MTCACHE: /* enable controller cache */
1560 st->flags &= ~ST_DONTBUFFER;
1561 goto try_new_value;
1562 case MTNOCACHE: /* disable controller cache */
1563 st->flags |= ST_DONTBUFFER;
1564 goto try_new_value;
1565 case MTERASE: /* erase volume */
1566 error = st_erase(st, number, flags);
1567 break;
1568 case MTSETBSIZ: /* Set block size for device */
1569 #ifdef NOTYET
1570 if (!(st->flags & ST_NEW_MOUNT)) {
1571 uprintf("re-mount tape before changing "
1572 "blocksize");
1573 error = EINVAL;
1574 break;
1575 }
1576 #endif
1577 if (number == 0)
1578 st->flags &= ~ST_FIXEDBLOCKS;
1579 else {
1580 if ((st->blkmin || st->blkmax) &&
1581 (number < st->blkmin ||
1582 number > st->blkmax)) {
1583 error = EINVAL;
1584 break;
1585 }
1586 st->flags |= ST_FIXEDBLOCKS;
1587 }
1588 st->blksize = number;
1589 st->flags |= ST_BLOCK_SET; /*XXX */
1590 goto try_new_value;
1591 case MTSETDNSTY: /* Set density for device and mode */
1592 /*
1593 * Any number >= 0 and <= 0xff is legal. Numbers
1594 * above 0x80 are 'vendor unique'.
1595 */
1596 if (number < 0 || number > 255) {
1597 error = EINVAL;
1598 break;
1599 } else
1600 st->density = number;
1601 goto try_new_value;
1602 case MTCMPRESS:
1603 error = st->ops(st, (number == 0) ?
1604 ST_OPS_CMPRSS_OFF : ST_OPS_CMPRSS_ON,
1605 XS_CTL_SILENT);
1606 break;
1607 case MTEWARN:
1608 if (number)
1609 st->flags |= ST_EARLYWARN;
1610 else
1611 st->flags &= ~ST_EARLYWARN;
1612 break;
1613
1614 default:
1615 error = EINVAL;
1616 }
1617 break;
1618 }
1619 case MTIOCIEOT:
1620 case MTIOCEEOT:
1621 break;
1622 case MTIOCRDSPOS:
1623 error = st_rdpos(st, 0, (uint32_t *)arg);
1624 break;
1625 case MTIOCRDHPOS:
1626 error = st_rdpos(st, 1, (uint32_t *)arg);
1627 break;
1628 case MTIOCSLOCATE:
1629 error = st_setpos(st, 0, (uint32_t *)arg);
1630 break;
1631 case MTIOCHLOCATE:
1632 error = st_setpos(st, 1, (uint32_t *)arg);
1633 break;
1634 default:
1635 error = scsipi_do_ioctl(st->sc_periph, dev, cmd, arg, flag, l);
1636 break;
1637 }
1638 return error;
1639
1640 try_new_value:
1641 /*
1642 * Check that the mode being asked for is aggreeable to the
1643 * drive. If not, put it back the way it was.
1644 *
1645 * If in control mode, we can make (persistent) mode changes
1646 * even if no medium is loaded (see st(4)).
1647 */
1648 if ((STMODE(dev) != CTRL_MODE || (st->flags & ST_MOUNTED) != 0) &&
1649 (error = st->ops(st, ST_OPS_MODESELECT, 0)) != 0) {
1650 /* put it back as it was */
1651 aprint_error_dev(st->sc_dev, "cannot set selected mode\n");
1652 st->density = hold_density;
1653 st->blksize = hold_blksize;
1654 if (st->blksize)
1655 st->flags |= ST_FIXEDBLOCKS;
1656 else
1657 st->flags &= ~ST_FIXEDBLOCKS;
1658 return error;
1659 }
1660 /*
1661 * As the drive liked it, if we are setting a new default,
1662 * set it into the structures as such.
1663 *
1664 * The means for deciding this are not finalised yet- but
1665 * if the device was opened in Control Mode, the values
1666 * are persistent now across mounts.
1667 */
1668 if (STMODE(dev) == CTRL_MODE) {
1669 switch ((short) (mt->mt_op)) {
1670 case MTSETBSIZ:
1671 st->modes[dsty].blksize = st->blksize;
1672 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER;
1673 break;
1674 case MTSETDNSTY:
1675 st->modes[dsty].density = st->density;
1676 st->modeflags[dsty] |= DENSITY_SET_BY_USER;
1677 break;
1678 }
1679 }
1680 return 0;
1681 }
1682
1683 /* Do a synchronous read. */
1684 static int
st_read(struct st_softc * st,char * bf,int size,int flags)1685 st_read(struct st_softc *st, char *bf, int size, int flags)
1686 {
1687 struct scsi_rw_tape cmd;
1688
1689 /* If it's a null transfer, return immediately */
1690 if (size == 0)
1691 return 0;
1692 memset(&cmd, 0, sizeof(cmd));
1693 cmd.opcode = READ;
1694 if (st->flags & ST_FIXEDBLOCKS) {
1695 cmd.byte2 |= SRW_FIXED;
1696 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE),
1697 cmd.len);
1698 } else
1699 _lto3b(size, cmd.len);
1700 return scsipi_command(st->sc_periph,
1701 (void *)&cmd, sizeof(cmd), (void *)bf, size, 0, ST_IO_TIME, NULL,
1702 flags | XS_CTL_DATA_IN);
1703 }
1704
1705 /* issue an erase command */
1706 static int
st_erase(struct st_softc * st,int full,int flags)1707 st_erase(struct st_softc *st, int full, int flags)
1708 {
1709 int tmo;
1710 struct scsi_erase cmd;
1711
1712 /*
1713 * Full erase means set LONG bit in erase command, which asks
1714 * the drive to erase the entire unit. Without this bit, we're
1715 * asking the drive to write an erase gap.
1716 */
1717 memset(&cmd, 0, sizeof(cmd));
1718 cmd.opcode = ERASE;
1719 if (full) {
1720 cmd.byte2 = SE_LONG;
1721 tmo = ST_SPC_TIME;
1722 } else
1723 tmo = ST_IO_TIME;
1724
1725 /*
1726 * XXX We always do this asynchronously, for now, unless the device
1727 * has the ST_Q_ERASE_NOIMM quirk. How long should we wait if we
1728 * want to (eventually) to it synchronously?
1729 */
1730 if ((st->quirks & ST_Q_ERASE_NOIMM) == 0)
1731 cmd.byte2 |= SE_IMMED;
1732
1733 return scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
1734 ST_RETRIES, tmo, NULL, flags);
1735 }
1736
1737 /* skip N blocks/filemarks/seq filemarks/eom */
1738 static int
st_space(struct st_softc * st,int number,u_int what,int flags)1739 st_space(struct st_softc *st, int number, u_int what, int flags)
1740 {
1741 struct scsi_space cmd;
1742 int error;
1743
1744 switch (what) {
1745 case SP_BLKS:
1746 if (st->flags & ST_PER_ACTION) {
1747 if (number > 0) {
1748 st->flags &= ~ST_PER_ACTION;
1749 return EIO;
1750 } else if (number < 0) {
1751 if (st->flags & ST_AT_FILEMARK) {
1752 /*
1753 * Handling of ST_AT_FILEMARK
1754 * in st_space will fill in the
1755 * right file mark count.
1756 */
1757 error = st_space(st, 0, SP_FILEMARKS,
1758 flags);
1759 if (error)
1760 return error;
1761 }
1762 if (st->flags & ST_BLANK_READ) {
1763 st->flags &= ~ST_BLANK_READ;
1764 return EIO;
1765 }
1766 st->flags &= ~(ST_EIO_PENDING|ST_EOM_PENDING);
1767 }
1768 }
1769 break;
1770 case SP_FILEMARKS:
1771 if (st->flags & ST_EIO_PENDING) {
1772 if (number > 0) {
1773 /* pretend we just discovered the error */
1774 st->flags &= ~ST_EIO_PENDING;
1775 return EIO;
1776 } else if (number < 0) {
1777 /* back away from the error */
1778 st->flags &= ~ST_EIO_PENDING;
1779 }
1780 }
1781 if (st->flags & ST_AT_FILEMARK) {
1782 st->flags &= ~ST_AT_FILEMARK;
1783 number--;
1784 }
1785 if ((st->flags & ST_BLANK_READ) && (number < 0)) {
1786 /* back away from unwritten tape */
1787 st->flags &= ~ST_BLANK_READ;
1788 number++; /* XXX dubious */
1789 }
1790 break;
1791 case SP_EOM:
1792 if (st->flags & ST_EOM_PENDING) {
1793 /* we're already there */
1794 st->flags &= ~ST_EOM_PENDING;
1795 return 0;
1796 }
1797 if (st->flags & ST_EIO_PENDING) {
1798 /* pretend we just discovered the error */
1799 st->flags &= ~ST_EIO_PENDING;
1800 return EIO;
1801 }
1802 if (st->flags & ST_AT_FILEMARK)
1803 st->flags &= ~ST_AT_FILEMARK;
1804 break;
1805 }
1806 if (number == 0)
1807 return 0;
1808
1809 memset(&cmd, 0, sizeof(cmd));
1810 cmd.opcode = SPACE;
1811 cmd.byte2 = what;
1812 _lto3b(number, cmd.number);
1813
1814 st->flags &= ~ST_POSUPDATED;
1815 st->last_ctl_resid = 0;
1816 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
1817 0, ST_SPC_TIME, NULL, flags);
1818
1819 if (error == 0 && (st->flags & ST_POSUPDATED) == 0) {
1820 number = number - st->last_ctl_resid;
1821 if (what == SP_BLKS) {
1822 if (st->blkno != -1)
1823 st->blkno += number;
1824 } else if (what == SP_FILEMARKS) {
1825 if (st->fileno != -1) {
1826 st->fileno += number;
1827 if (number > 0)
1828 st->blkno = 0;
1829 else if (number < 0)
1830 st->blkno = -1;
1831 }
1832 } else if (what == SP_EOM) {
1833 st_updatefilepos(st);
1834 }
1835 }
1836 return error;
1837 }
1838
1839 /*
1840 * write N filemarks
1841 */
1842 static int
st_write_filemarks(struct st_softc * st,int number,int flags)1843 st_write_filemarks(struct st_softc *st, int number, int flags)
1844 {
1845 int error;
1846 struct scsi_write_filemarks cmd;
1847
1848 /*
1849 * It's hard to write a negative number of file marks.
1850 * Don't try.
1851 */
1852 if (number < 0) {
1853 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
1854 ("EINVAL: st_write_filemarks not writing %d file marks\n", number));
1855 return EINVAL;
1856 }
1857
1858 switch (number) {
1859 case 0: /* really a command to sync the drive's buffers */
1860 break;
1861 case 1:
1862 if (st->flags & ST_FM_WRITTEN) /* already have one down */
1863 st->flags &= ~ST_WRITTEN;
1864 else
1865 st->flags |= ST_FM_WRITTEN;
1866 st->flags &= ~ST_PER_ACTION;
1867 break;
1868 default:
1869 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN);
1870 }
1871
1872 memset(&cmd, 0, sizeof(cmd));
1873 cmd.opcode = WRITE_FILEMARKS;
1874 if (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(st->sc_periph)) ==
1875 SCSIPI_BUSTYPE_ATAPI)
1876 cmd.byte2 = SR_IMMED;
1877 /*
1878 * The ATAPI Onstream DI-30 doesn't support writing filemarks, but
1879 * WRITE_FILEMARKS is still used to flush the buffer
1880 */
1881 if ((st->quirks & ST_Q_NOFILEMARKS) == 0)
1882 _lto3b(number, cmd.number);
1883
1884 /* XXX WE NEED TO BE ABLE TO GET A RESIDIUAL XXX */
1885 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
1886 0, ST_IO_TIME * 4, NULL, flags);
1887 if (error == 0 && st->fileno != -1)
1888 st->fileno += number;
1889 return error;
1890 }
1891
1892 /*
1893 * Make sure the right number of file marks is on tape if the
1894 * tape has been written. If the position argument is true,
1895 * leave the tape positioned where it was originally.
1896 *
1897 * nmarks returns the number of marks to skip (or, if position
1898 * true, which were skipped) to get back original position.
1899 */
1900 static int
st_check_eod(struct st_softc * st,boolean position,int * nmarks,int flags)1901 st_check_eod(struct st_softc *st, boolean position, int *nmarks, int flags)
1902 {
1903 int error;
1904
1905 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) {
1906 default:
1907 *nmarks = 0;
1908 return 0;
1909 case ST_WRITTEN:
1910 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD:
1911 *nmarks = 1;
1912 break;
1913 case ST_WRITTEN | ST_2FM_AT_EOD:
1914 *nmarks = 2;
1915 }
1916 error = st_write_filemarks(st, *nmarks, flags);
1917 if (position && !error)
1918 error = st_space(st, -*nmarks, SP_FILEMARKS, flags);
1919 return error;
1920 }
1921
1922 /* load/unload/retension */
1923 static int
st_load(struct st_softc * st,u_int type,int flags)1924 st_load(struct st_softc *st, u_int type, int flags)
1925 {
1926 int error;
1927 struct scsi_load cmd;
1928
1929 if (type != LD_LOAD) {
1930 int nmarks;
1931
1932 error = st_check_eod(st, FALSE, &nmarks, flags);
1933 if (error) {
1934 aprint_error_dev(st->sc_dev,
1935 "failed to write closing filemarks at "
1936 "unload, errno=%d\n", error);
1937 return error;
1938 }
1939 }
1940 if (st->quirks & ST_Q_IGNORE_LOADS) {
1941 if (type == LD_LOAD)
1942 /*
1943 * If we ignore loads, at least we should try a rewind.
1944 */
1945 return st_rewind(st, 0, flags);
1946 /* otherwise, we should do what's asked of us */
1947 }
1948
1949 memset(&cmd, 0, sizeof(cmd));
1950 cmd.opcode = LOAD;
1951 if (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(st->sc_periph)) ==
1952 SCSIPI_BUSTYPE_ATAPI)
1953 cmd.byte2 = SR_IMMED;
1954 cmd.how = type;
1955
1956 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
1957 ST_RETRIES, ST_SPC_TIME, NULL, flags);
1958 if (error) {
1959 aprint_error_dev(st->sc_dev, "error %d in st_load (op %d)\n",
1960 error, type);
1961 }
1962 return error;
1963 }
1964
1965 /* Rewind the device */
1966 static int
st_rewind(struct st_softc * st,u_int immediate,int flags)1967 st_rewind(struct st_softc *st, u_int immediate, int flags)
1968 {
1969 struct scsi_rewind cmd;
1970 int error;
1971 int nmarks;
1972 int timeout;
1973
1974 error = st_check_eod(st, FALSE, &nmarks, flags);
1975 if (error) {
1976 aprint_error_dev(st->sc_dev,
1977 "failed to write closing filemarks at "
1978 "rewind, errno=%d\n", error);
1979 return error;
1980 }
1981 st->flags &= ~ST_PER_ACTION;
1982
1983 /* If requestor asked for immediate response, set a short timeout */
1984 timeout = immediate ? ST_CTL_TIME : ST_SPC_TIME;
1985
1986 /* ATAPI tapes always need immediate to be set */
1987 if (scsipi_periph_bustype(st->sc_periph) == SCSIPI_BUSTYPE_ATAPI)
1988 immediate = SR_IMMED;
1989
1990 memset(&cmd, 0, sizeof(cmd));
1991 cmd.opcode = REWIND;
1992 cmd.byte2 = immediate;
1993
1994 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
1995 ST_RETRIES, timeout, NULL, flags);
1996 if (error) {
1997 aprint_error_dev(st->sc_dev, "error %d trying to rewind\n",
1998 error);
1999 /* lost position */
2000 st->fileno = st->blkno = -1;
2001 } else
2002 st->fileno = st->blkno = 0;
2003 return error;
2004 }
2005
2006 static void
st_updatefilepos(struct st_softc * st)2007 st_updatefilepos(struct st_softc *st)
2008 {
2009 int error;
2010 uint8_t posdata[32];
2011 struct scsi_tape_read_position cmd;
2012
2013 memset(&cmd, 0, sizeof(cmd));
2014 memset(&posdata, 0, sizeof(posdata));
2015 cmd.opcode = READ_POSITION;
2016 cmd.byte1 = 6; /* service action: LONG FORM */
2017
2018 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd),
2019 (void *)&posdata, sizeof(posdata), ST_RETRIES, ST_CTL_TIME, NULL,
2020 XS_CTL_SILENT | XS_CTL_DATA_IN);
2021
2022 if (error == 0) {
2023 #ifdef SCSIPI_DEBUG
2024 if (st->sc_periph->periph_dbflags & SCSIPI_DB3) {
2025 int hard;
2026
2027 printf("posdata: ");
2028 for (hard = 0; hard < sizeof(posdata); hard++)
2029 printf("%02x ", posdata[hard] & 0xff);
2030 printf("\n");
2031 }
2032 #endif
2033 if (posdata[0] & 0xC) { /* Block|Mark Position Unknown */
2034 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
2035 ("st_updatefilepos block/mark position unknown (0x%02x)\n",
2036 posdata[0]));
2037 } else {
2038 st->fileno = _8btol(&posdata[16]);
2039 st->blkno = 0;
2040 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
2041 ("st_updatefilepos file position %"PRId64"\n",
2042 st->fileno));
2043 return;
2044 }
2045 } else {
2046 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
2047 ("st_updatefilepos READ POSITION(LONG_FORM) failed (error=%d)\n",
2048 error));
2049 }
2050 st->fileno = -1;
2051 st->blkno = -1;
2052 }
2053
2054 static int
st_rdpos(struct st_softc * st,int hard,uint32_t * blkptr)2055 st_rdpos(struct st_softc *st, int hard, uint32_t *blkptr)
2056 {
2057 int error;
2058 uint8_t posdata[20];
2059 struct scsi_tape_read_position cmd;
2060
2061 /*
2062 * We try and flush any buffered writes here if we were writing
2063 * and we're trying to get hardware block position. It eats
2064 * up performance substantially, but I'm wary of drive firmware.
2065 *
2066 * I think that *logical* block position is probably okay-
2067 * but hardware block position might have to wait for data
2068 * to hit media to be valid. Caveat Emptor.
2069 */
2070
2071 if (hard && (st->flags & ST_WRITTEN)) {
2072 /* First flush any pending writes... */
2073 error = st_write_filemarks(st, 0, XS_CTL_SILENT);
2074 /*
2075 * The latter case is for 'write protected' tapes
2076 * which are too stupid to recognize a zero count
2077 * for writing filemarks as a no-op.
2078 */
2079 if (error != 0 && error != EACCES && error != EROFS)
2080 return error;
2081 }
2082
2083 memset(&cmd, 0, sizeof(cmd));
2084 memset(&posdata, 0, sizeof(posdata));
2085 cmd.opcode = READ_POSITION;
2086 if (hard)
2087 cmd.byte1 = 1;
2088
2089 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd),
2090 (void *)&posdata, sizeof(posdata), ST_RETRIES, ST_CTL_TIME, NULL,
2091 XS_CTL_SILENT | XS_CTL_DATA_IN);
2092
2093 if (error == 0) {
2094 #if 0
2095 printf("posdata:");
2096 for (hard = 0; hard < sizeof(posdata); hard++)
2097 printf("%02x ", posdata[hard] & 0xff);
2098 printf("\n");
2099 #endif
2100 if (posdata[0] & 0x4) { /* Block Position Unknown */
2101 SC_DEBUG(st->sc_periph, SCSIPI_DB3,
2102 ("EINVAL: strdpos block position unknown\n"));
2103 error = EINVAL;
2104 }
2105 else
2106 *blkptr = _4btol(&posdata[4]);
2107 }
2108 return error;
2109 }
2110
2111 static int
st_setpos(struct st_softc * st,int hard,uint32_t * blkptr)2112 st_setpos(struct st_softc *st, int hard, uint32_t *blkptr)
2113 {
2114 int error;
2115 struct scsi_tape_locate cmd;
2116
2117 /*
2118 * We used to try and flush any buffered writes here.
2119 * Now we push this onto user applications to either
2120 * flush the pending writes themselves (via a zero count
2121 * WRITE FILEMARKS command) or they can trust their tape
2122 * drive to do this correctly for them.
2123 *
2124 * There are very ugly performance limitations otherwise.
2125 */
2126
2127 memset(&cmd, 0, sizeof(cmd));
2128 cmd.opcode = LOCATE;
2129 if (hard)
2130 cmd.byte2 = 1 << 2;
2131 _lto4b(*blkptr, cmd.blkaddr);
2132 error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
2133 ST_RETRIES, ST_SPC_TIME, NULL, 0);
2134 /*
2135 * Note file && block number position now unknown (if
2136 * these things ever start being maintained in this driver)
2137 */
2138 st->fileno = st->blkno = -1;
2139 return error;
2140 }
2141
2142
2143 /*
2144 * Look at the returned sense and act on the error and determine
2145 * the unix error number to pass back..., 0 (== report no error),
2146 * -1 = retry the operation, -2 continue error processing.
2147 */
2148 static int
st_interpret_sense(struct scsipi_xfer * xs)2149 st_interpret_sense(struct scsipi_xfer *xs)
2150 {
2151 struct scsipi_periph *periph = xs->xs_periph;
2152 struct scsi_sense_data *sense = &xs->sense.scsi_sense;
2153 struct buf *bp = xs->bp;
2154 struct st_softc *st = device_private(periph->periph_dev);
2155 int retval = EJUSTRETURN;
2156 int doprint = ((xs->xs_control & XS_CTL_SILENT) == 0);
2157 uint8_t key;
2158 int32_t info;
2159
2160 /*
2161 * If it isn't a extended or extended/deferred error, let
2162 * the generic code handle it.
2163 */
2164 if (SSD_RCODE(sense->response_code) != SSD_RCODE_CURRENT &&
2165 SSD_RCODE(sense->response_code) != SSD_RCODE_DEFERRED)
2166 return retval;
2167
2168 if (sense->response_code & SSD_RCODE_VALID)
2169 info = _4btol(sense->info);
2170 else
2171 info = (st->flags & ST_FIXEDBLOCKS) ?
2172 xs->datalen / st->blksize : xs->datalen;
2173 key = SSD_SENSE_KEY(sense->flags);
2174 st->mt_erreg = key;
2175 st->asc = sense->asc;
2176 st->ascq = sense->ascq;
2177 st->mt_resid = (short) info;
2178
2179 if (key == SKEY_NOT_READY && st->asc == 0x4 && st->ascq == 0x1) {
2180 /* Not Ready, Logical Unit Is in Process Of Becoming Ready */
2181 if (!callout_pending(&periph->periph_callout))
2182 scsipi_periph_freeze(periph, 1);
2183 callout_reset(&periph->periph_callout,
2184 hz, scsipi_periph_timed_thaw, periph);
2185 return ERESTART;
2186 }
2187
2188 /* If the device is not open yet, let generic handle */
2189 if ((periph->periph_flags & PERIPH_OPEN) == 0)
2190 return retval;
2191
2192 xs->resid = info;
2193 if (st->flags & ST_FIXEDBLOCKS) {
2194 if (bp) {
2195 xs->resid *= st->blksize;
2196 st->last_io_resid = xs->resid;
2197 } else
2198 st->last_ctl_resid = xs->resid;
2199 if (key == SKEY_VOLUME_OVERFLOW) {
2200 st->flags |= ST_EIO_PENDING;
2201 if (bp)
2202 bp->b_resid = xs->resid;
2203 } else if (sense->flags & SSD_EOM) {
2204 if ((st->flags & ST_EARLYWARN) == 0)
2205 st->flags |= ST_EIO_PENDING;
2206 st->flags |= ST_EOM_PENDING;
2207 if (bp) {
2208 #if 0
2209 bp->b_resid = xs->resid;
2210 #else
2211 /*
2212 * Grotesque as it seems, the few times
2213 * I've actually seen a non-zero resid,
2214 * the tape drive actually lied and had
2215 * written all the data!
2216 */
2217 bp->b_resid = 0;
2218 #endif
2219 }
2220 }
2221 if (sense->flags & SSD_FILEMARK) {
2222 st->flags |= ST_AT_FILEMARK;
2223 if (bp)
2224 bp->b_resid = xs->resid;
2225 if (st->fileno != (daddr_t) -1) {
2226 st->fileno++;
2227 st->blkno = 0;
2228 st->flags |= ST_POSUPDATED;
2229 }
2230 }
2231 if (sense->flags & SSD_ILI) {
2232 st->flags |= ST_EIO_PENDING;
2233 if (bp)
2234 bp->b_resid = xs->resid;
2235 if (sense->response_code & SSD_RCODE_VALID &&
2236 (xs->xs_control & XS_CTL_SILENT) == 0)
2237 aprint_error_dev(st->sc_dev,
2238 "block wrong size, %d blocks residual\n",
2239 info);
2240
2241 /*
2242 * This quirk code helps the drive read
2243 * the first tape block, regardless of
2244 * format. That is required for these
2245 * drives to return proper MODE SENSE
2246 * information.
2247 */
2248 if ((st->quirks & ST_Q_SENSE_HELP) &&
2249 (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)
2250 st->blksize -= 512;
2251 else if ((st->flags & ST_POSUPDATED) == 0) {
2252 if (st->blkno != (daddr_t) -1) {
2253 st->blkno +=
2254 (xs->datalen / st->blksize);
2255 st->flags |= ST_POSUPDATED;
2256 }
2257 }
2258 }
2259 /*
2260 * If data wanted and no data was transferred, do it immediately
2261 */
2262 if (xs->datalen && xs->resid >= xs->datalen) {
2263 if (st->flags & ST_EIO_PENDING)
2264 return EIO;
2265 if (st->flags & ST_AT_FILEMARK) {
2266 if (bp)
2267 bp->b_resid = xs->resid;
2268 return 0;
2269 }
2270 }
2271 } else { /* must be variable mode */
2272 if (bp)
2273 st->last_io_resid = xs->resid;
2274 else
2275 st->last_ctl_resid = xs->resid;
2276 if (sense->flags & SSD_EOM) {
2277 /*
2278 * The current semantics of this
2279 * driver requires EOM detection
2280 * to return EIO unless early
2281 * warning detection is enabled
2282 * for variable mode (this is always
2283 * on for fixed block mode).
2284 */
2285 if (st->flags & ST_EARLYWARN) {
2286 st->flags |= ST_EOM_PENDING;
2287 retval = 0;
2288 } else {
2289 retval = EIO;
2290 /*
2291 * If we return an error we can't claim to
2292 * have transferred all data.
2293 */
2294 if (xs->resid == 0)
2295 xs->resid = xs->datalen;
2296 }
2297
2298 /*
2299 * If it's an unadorned EOM detection,
2300 * suppress printing an error.
2301 */
2302 if (key == SKEY_NO_SENSE) {
2303 doprint = 0;
2304 }
2305 } else if (sense->flags & SSD_FILEMARK) {
2306 retval = 0;
2307 if (st->fileno != (daddr_t) -1) {
2308 st->fileno++;
2309 st->blkno = 0;
2310 st->flags |= ST_POSUPDATED;
2311 }
2312 } else if (sense->flags & SSD_ILI) {
2313 if (info < 0) {
2314 /*
2315 * The tape record was bigger than the read
2316 * we issued.
2317 */
2318 if ((xs->xs_control & XS_CTL_SILENT) == 0) {
2319 aprint_error_dev(st->sc_dev,
2320 "%d-byte tape record too big"
2321 " for %d-byte user buffer\n",
2322 xs->datalen - info, xs->datalen);
2323 }
2324 retval = EIO;
2325 } else {
2326 retval = 0;
2327 if (st->blkno != (daddr_t) -1) {
2328 st->blkno++;
2329 st->flags |= ST_POSUPDATED;
2330 }
2331 }
2332 }
2333 if (bp)
2334 bp->b_resid = xs->resid;
2335 }
2336
2337 #ifndef SCSIPI_DEBUG
2338 if (retval == 0 && key == SKEY_NO_SENSE)
2339 doprint = 0;
2340 #endif
2341 if (key == SKEY_BLANK_CHECK) {
2342 /*
2343 * This quirk code helps the drive read the
2344 * first tape block, regardless of format. That
2345 * is required for these drives to return proper
2346 * MODE SENSE information.
2347 */
2348 if ((st->quirks & ST_Q_SENSE_HELP) &&
2349 (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) {
2350 /* still starting */
2351 st->blksize -= 512;
2352 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) {
2353 st->flags |= ST_BLANK_READ;
2354 xs->resid = xs->datalen;
2355 if (bp) {
2356 bp->b_resid = xs->resid;
2357 /* return an EOF */
2358 }
2359 retval = 0;
2360 /* lost position */
2361 st->fileno = st->blkno = -1;
2362 }
2363 }
2364
2365 /*
2366 * If generic sense processing will continue, we should not
2367 * print sense info here.
2368 */
2369 if (retval == EJUSTRETURN)
2370 doprint = 0;
2371
2372 if (doprint) {
2373 /* Print verbose sense info if possible */
2374 if (scsipi_print_sense(xs, 0) != 0)
2375 return retval;
2376
2377 /* Print less-verbose sense info */
2378 scsipi_printaddr(periph);
2379 printf("Sense Key 0x%02x", key);
2380 if ((sense->response_code & SSD_RCODE_VALID) != 0) {
2381 switch (key) {
2382 case SKEY_NOT_READY:
2383 case SKEY_ILLEGAL_REQUEST:
2384 case SKEY_UNIT_ATTENTION:
2385 case SKEY_DATA_PROTECT:
2386 break;
2387 case SKEY_VOLUME_OVERFLOW:
2388 case SKEY_BLANK_CHECK:
2389 printf(", requested size: %d (decimal)", info);
2390 break;
2391 case SKEY_ABORTED_COMMAND:
2392 if (xs->xs_retries)
2393 printf(", retrying");
2394 printf(", cmd 0x%x, info 0x%x",
2395 xs->cmd->opcode, info);
2396 break;
2397 default:
2398 printf(", info = %d (decimal)", info);
2399 }
2400 }
2401 if (sense->extra_len != 0) {
2402 int n;
2403 printf(", data =");
2404 for (n = 0; n < sense->extra_len; n++)
2405 printf(" %02x", sense->csi[n]);
2406 }
2407 printf("\n");
2408 }
2409 return retval;
2410 }
2411
2412 /*
2413 * The quirk here is that the drive returns some value to st_mode_sense
2414 * incorrectly until the tape has actually passed by the head.
2415 *
2416 * The method is to set the drive to large fixed-block state (user-specified
2417 * density and 1024-byte blocks), then read and rewind to get it to sense the
2418 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't
2419 * work, as a last resort, try variable- length blocks. The result will be
2420 * the ability to do an accurate st_mode_sense.
2421 *
2422 * We know we can do a rewind because we just did a load, which implies rewind.
2423 * Rewind seems preferable to space backward if we have a virgin tape.
2424 *
2425 * The rest of the code for this quirk is in ILI processing and BLANK CHECK
2426 * error processing, both part of st_interpret_sense.
2427 */
2428 static int
st_touch_tape(struct st_softc * st)2429 st_touch_tape(struct st_softc *st)
2430 {
2431 char *bf;
2432 int readsize;
2433 int error;
2434
2435 bf = malloc(1024, M_TEMP, M_WAITOK);
2436 if ((error = st->ops(st, ST_OPS_MODESENSE, 0)) != 0)
2437 goto bad;
2438
2439 /*
2440 * If the block size is already known from the
2441 * sense data, use it. Else start probing at 1024.
2442 */
2443 if (st->media_blksize > 0)
2444 st->blksize = st->media_blksize;
2445 else
2446 st->blksize = 1024;
2447
2448 do {
2449 switch (st->blksize) {
2450 case 512:
2451 case 1024:
2452 readsize = st->blksize;
2453 st->flags |= ST_FIXEDBLOCKS;
2454 break;
2455 default:
2456 readsize = 1;
2457 st->flags &= ~ST_FIXEDBLOCKS;
2458 }
2459 if ((error = st->ops(st, ST_OPS_MODESELECT, XS_CTL_SILENT))
2460 != 0) {
2461 /*
2462 * The device did not agree with the proposed
2463 * block size. If we exhausted our options,
2464 * return failure, else try another.
2465 */
2466 if (readsize == 1)
2467 goto bad;
2468 st->blksize -= 512;
2469 continue;
2470 }
2471 st_read(st, bf, readsize, XS_CTL_SILENT); /* XXX */
2472 if ((error = st_rewind(st, 0, 0)) != 0) {
2473 bad: free(bf, M_TEMP);
2474 return error;
2475 }
2476 } while (readsize != 1 && readsize > st->blksize);
2477
2478 free(bf, M_TEMP);
2479 return 0;
2480 }
2481
2482 static int
stdump(dev_t dev,daddr_t blkno,void * va,size_t size)2483 stdump(dev_t dev, daddr_t blkno, void *va, size_t size)
2484 {
2485 /* Not implemented. */
2486 return ENXIO;
2487 }
2488
2489 /*
2490 * Send a filled out parameter structure to the drive to
2491 * set it into the desire modes etc.
2492 */
2493 int
st_mode_select(struct st_softc * st,int flags)2494 st_mode_select(struct st_softc *st, int flags)
2495 {
2496 u_int select_len;
2497 struct select {
2498 struct scsi_mode_parameter_header_6 header;
2499 struct scsi_general_block_descriptor blk_desc;
2500 u_char sense_data[MAX_PAGE_0_SIZE];
2501 } select;
2502 struct scsipi_periph *periph = st->sc_periph;
2503
2504 select_len = sizeof(select.header) + sizeof(select.blk_desc) +
2505 st->page_0_size;
2506
2507 /*
2508 * This quirk deals with drives that have only one valid mode
2509 * and think this gives them license to reject all mode selects,
2510 * even if the selected mode is the one that is supported.
2511 */
2512 if (st->quirks & ST_Q_UNIMODAL) {
2513 SC_DEBUG(periph, SCSIPI_DB3,
2514 ("not setting density 0x%x blksize 0x%x\n",
2515 st->density, st->blksize));
2516 return 0;
2517 }
2518
2519 /* Set up for a mode select */
2520 memset(&select, 0, sizeof(select));
2521 select.header.blk_desc_len = sizeof(struct
2522 scsi_general_block_descriptor);
2523 select.header.dev_spec &= ~SMH_DSP_BUFF_MODE;
2524 select.blk_desc.density = st->density;
2525 if (st->flags & ST_DONTBUFFER)
2526 select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF;
2527 else
2528 select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON;
2529 if (st->flags & ST_FIXEDBLOCKS)
2530 _lto3b(st->blksize, select.blk_desc.blklen);
2531 if (st->page_0_size)
2532 memcpy(select.sense_data, st->sense_data, st->page_0_size);
2533
2534 /* do the command */
2535 return scsipi_mode_select(periph, 0, &select.header, select_len,
2536 flags, ST_RETRIES, ST_CTL_TIME);
2537 }
2538