1 /*
2 * Copyright (c) 1982, 1986 Regents of the University of California.
3 * All rights reserved. The Berkeley software License Agreement
4 * specifies the terms and conditions for redistribution.
5 *
6 * @(#)tm.c 7.14 (Berkeley) 12/16/90
7 */
8
9 #include "te.h"
10 #include "ts.h"
11 #if NTE > 0
12 /*
13 * TM11/TE10 tape driver
14 *
15 * TODO:
16 * test driver with more than one controller
17 * test reset code
18 * what happens if you offline tape during rewind?
19 * test using file system on tape
20 */
21 #include "sys/param.h"
22 #include "sys/systm.h"
23 #include "sys/buf.h"
24 #include "sys/conf.h"
25 #include "sys/user.h"
26 #include "sys/file.h"
27 #include "sys/map.h"
28 #include "sys/vm.h"
29 #include "sys/ioctl.h"
30 #include "sys/mtio.h"
31 #include "sys/cmap.h"
32 #include "sys/uio.h"
33 #include "sys/kernel.h"
34 #include "sys/syslog.h"
35 #include "sys/tprintf.h"
36
37 #include "../include/pte.h"
38 #include "../include/cpu.h"
39 #include "ubareg.h"
40 #include "ubavar.h"
41 #include "tmreg.h"
42
43 /*
44 * There is a ctmbuf per tape controller.
45 * It is used as the token to pass to the internal routines
46 * to execute tape ioctls, and also acts as a lock on the slaves
47 * on the controller, since there is only one per controller.
48 * In particular, when the tape is rewinding on close we release
49 * the user process but any further attempts to use the tape drive
50 * before the rewind completes will hang waiting for ctmbuf.
51 */
52 struct buf ctmbuf[NTM];
53
54 /*
55 * Driver unibus interface routines and variables.
56 */
57 int tmprobe(), tmslave(), tmattach(), tmdgo(), tmintr();
58 struct uba_ctlr *tmminfo[NTM];
59 struct uba_device *tedinfo[NTE];
60 struct buf teutab[NTE];
61 short tetotm[NTE];
62 u_short tmstd[] = { 0772520, 0 };
63 struct uba_driver tmdriver =
64 { tmprobe, tmslave, tmattach, tmdgo, tmstd, "te", tedinfo, "tm", tmminfo, 0 };
65
66 /* bits in minor device */
67 #define TEUNIT(dev) (minor(dev)&03)
68 #define TMUNIT(dev) (tetotm[TEUNIT(dev)])
69 #define T_NOREWIND 04
70 #define T_1600BPI 0x8
71
72 #define INF (daddr_t)1000000L
73
74 /*
75 * Software state per tape transport.
76 *
77 * 1. A tape drive is a unique-open device; we refuse opens when it is already.
78 * 2. We keep track of the current position on a block tape and seek
79 * before operations by forward/back spacing if necessary.
80 * 3. We remember if the last operation was a write on a tape, so if a tape
81 * is open read write and the last thing done is a write we can
82 * write a standard end of tape mark (two eofs).
83 * 4. We remember the status registers after the last command, using
84 * then internally and returning them to the SENSE ioctl.
85 * 5. We remember the last density the tape was used at. If it is
86 * not a BOT when we start using it and we are writing, we don't
87 * let the density be changed.
88 */
89 struct te_softc {
90 char sc_openf; /* lock against multiple opens */
91 char sc_lastiow; /* last op was a write */
92 daddr_t sc_blkno; /* block number, for block device tape */
93 daddr_t sc_nxrec; /* position of end of tape, if known */
94 u_short sc_erreg; /* copy of last erreg */
95 u_short sc_ioerreg; /* copy of last erreg for I/O command */
96 u_short sc_dsreg; /* copy of last dsreg */
97 short sc_resid; /* copy of last bc */
98 #ifdef unneeded
99 short sc_lastcmd; /* last command to handle direction changes */
100 #endif
101 u_short sc_dens; /* prototype command with density info */
102 short sc_tact; /* timeout is active */
103 daddr_t sc_timo; /* time until timeout expires */
104 int sc_blks; /* number of I/O operations since open */
105 int sc_softerrs; /* number of soft I/O errors since open */
106 tpr_t sc_tpr; /* tprintf handle */
107 } te_softc[NTE];
108 #ifdef unneeded
109 int tmgapsdcnt; /* DEBUG */
110 #endif
111
112 /*
113 * States for um->um_tab.b_active, the per controller state flag.
114 * This is used to sequence control in the driver.
115 */
116 #define SSEEK 1 /* seeking */
117 #define SIO 2 /* doing seq i/o */
118 #define SCOM 3 /* sending control command */
119 #define SREW 4 /* sending a drive rewind */
120
121 /*
122 * Determine if there is a controller for
123 * a tm at address reg. Our goal is to make the
124 * device interrupt.
125 */
tmprobe(reg)126 tmprobe(reg)
127 caddr_t reg;
128 {
129 register int br, cvec; /* must be r11,r10; value-result */
130
131 #ifdef lint
132 br = 0; cvec = br; br = cvec;
133 tmintr(0);
134 #endif
135 ((struct tmdevice *)reg)->tmcs = TM_IE;
136 /*
137 * If this is a tm11, it ought to have interrupted
138 * by now, if it isn't (ie: it is a ts04) then we just
139 * hope that it didn't interrupt, so autoconf will ignore it.
140 * Just in case, we will reference one
141 * of the more distant registers, and hope for a machine
142 * check, or similar disaster if this is a ts.
143 *
144 * Note: on an 11/780, badaddr will just generate
145 * a uba error for a ts; but our caller will notice that
146 * so we won't check for it.
147 */
148 if (badaddr((caddr_t)&((struct tmdevice *)reg)->tmrd, 2))
149 return (0);
150 return (sizeof (struct tmdevice));
151 }
152
153 /*
154 * Due to a design flaw, we cannot ascertain if the tape
155 * exists or not unless it is on line - ie: unless a tape is
156 * mounted. This is too servere a restriction to bear,
157 * so all units are assumed to exist.
158 */
159 /*ARGSUSED*/
160 tmslave(ui, reg)
161 struct uba_device *ui;
162 caddr_t reg;
163 {
164
165 return (1);
166 }
167
168 /*
169 * Record attachment of the unit to the controller.
170 */
171 /*ARGSUSED*/
172 tmattach(ui)
173 struct uba_device *ui;
174 {
175 /*
176 * Tetotm is used in TMUNIT to index the ctmbuf
177 * array given a te unit number.
178 */
179 tetotm[ui->ui_unit] = ui->ui_mi->um_ctlr;
180 }
181
182 int tmtimer();
183 /*
184 * Open the device. Tapes are unique open
185 * devices, so we refuse if it is already open.
186 * We also check that a tape is available, and
187 * don't block waiting here; if you want to wait
188 * for a tape you should timeout in user code.
189 */
190
191 #ifdef AVIV
192 int tmdens[4] = { 0x6000, 0x0000, 0x2000, 0 };
193 #endif AVIV
194 int tmdiag;
195
tmopen(dev,flag)196 tmopen(dev, flag)
197 dev_t dev;
198 int flag;
199 {
200 register int teunit;
201 register struct uba_device *ui;
202 register struct te_softc *sc;
203 int olddens, dens, error;
204 int s;
205
206 teunit = TEUNIT(dev);
207 if (teunit>=NTE || (ui = tedinfo[teunit]) == 0 || ui->ui_alive == 0)
208 return (ENXIO);
209 if ((sc = &te_softc[teunit])->sc_openf)
210 return (EBUSY);
211 sc->sc_openf = 1;
212 olddens = sc->sc_dens;
213 dens = TM_IE | TM_GO | (ui->ui_slave << 8);
214 #ifndef AVIV
215 if ((minor(dev) & T_1600BPI) == 0)
216 dens |= TM_D800;
217 #else AVIV
218 dens |= tmdens[(minor(dev)>>3)&03];
219 #endif AVIV
220 sc->sc_dens = dens;
221 get:
222 tmcommand(dev, TM_SENSE, 1);
223 if (sc->sc_erreg&TMER_SDWN) {
224 if (error = tsleep((caddr_t)&lbolt, (PZERO+1) | PCATCH,
225 devopn, 0))
226 return (error);
227 goto get;
228 }
229 sc->sc_dens = olddens;
230 if ((sc->sc_erreg&(TMER_SELR|TMER_TUR)) != (TMER_SELR|TMER_TUR)) {
231 uprintf("te%d: not online\n", teunit);
232 sc->sc_openf = 0;
233 return (EIO);
234 }
235 if ((flag&FWRITE) && (sc->sc_erreg&TMER_WRL)) {
236 uprintf("te%d: no write ring\n", teunit);
237 sc->sc_openf = 0;
238 return (EIO);
239 }
240 if ((sc->sc_erreg&TMER_BOT) == 0 && (flag&FWRITE) &&
241 dens != sc->sc_dens) {
242 uprintf("te%d: can't change density in mid-tape\n", teunit);
243 sc->sc_openf = 0;
244 return (EIO);
245 }
246 sc->sc_blkno = (daddr_t)0;
247 sc->sc_nxrec = INF;
248 sc->sc_lastiow = 0;
249 sc->sc_dens = dens;
250 sc->sc_blks = 0;
251 sc->sc_softerrs = 0;
252 sc->sc_tpr = tprintf_open();
253 s = splclock();
254 if (sc->sc_tact == 0) {
255 sc->sc_timo = INF;
256 sc->sc_tact = 1;
257 timeout(tmtimer, (caddr_t)dev, 5*hz);
258 }
259 splx(s);
260 return (0);
261 }
262
263 /*
264 * Close tape device.
265 *
266 * If tape was open for writing or last operation was
267 * a write, then write two EOF's and backspace over the last one.
268 * Unless this is a non-rewinding special file, rewind the tape.
269 * Make the tape available to others.
270 */
tmclose(dev,flag)271 tmclose(dev, flag)
272 register dev_t dev;
273 register flag;
274 {
275 register struct te_softc *sc = &te_softc[TEUNIT(dev)];
276
277 if (flag == FWRITE || (flag&FWRITE) && sc->sc_lastiow) {
278 tmcommand(dev, TM_WEOF, 1);
279 tmcommand(dev, TM_WEOF, 1);
280 tmcommand(dev, TM_SREV, 1);
281 }
282 if ((minor(dev)&T_NOREWIND) == 0)
283 /*
284 * 0 count means don't hang waiting for rewind complete
285 * rather ctmbuf stays busy until the operation completes
286 * preventing further opens from completing by
287 * preventing a TM_SENSE from completing.
288 */
289 tmcommand(dev, TM_REW, 0);
290 if (sc->sc_blks > 100 && sc->sc_softerrs > sc->sc_blks / 100)
291 log(LOG_INFO, "te%d: %d soft errors in %d blocks\n",
292 TEUNIT(dev), sc->sc_softerrs, sc->sc_blks);
293 tprintf_close(sc->sc_tpr);
294 sc->sc_openf = 0;
295 return (0);
296 }
297
298 /*
299 * Execute a command on the tape drive
300 * a specified number of times.
301 */
tmcommand(dev,com,count)302 tmcommand(dev, com, count)
303 dev_t dev;
304 int com, count;
305 {
306 register struct buf *bp;
307 register int s;
308
309 bp = &ctmbuf[TMUNIT(dev)];
310 s = spl5();
311 while (bp->b_flags&B_BUSY) {
312 /*
313 * This special check is because B_BUSY never
314 * gets cleared in the non-waiting rewind case.
315 */
316 if (bp->b_repcnt == 0 && (bp->b_flags&B_DONE))
317 break;
318 bp->b_flags |= B_WANTED;
319 sleep((caddr_t)bp, PRIBIO);
320 }
321 bp->b_flags = B_BUSY|B_READ;
322 splx(s);
323 bp->b_dev = dev;
324 bp->b_repcnt = -count;
325 bp->b_command = com;
326 bp->b_blkno = 0;
327 tmstrategy(bp);
328 /*
329 * In case of rewind from close, don't wait.
330 * This is the only case where count can be 0.
331 */
332 if (count == 0)
333 return;
334 iowait(bp);
335 if (bp->b_flags&B_WANTED)
336 wakeup((caddr_t)bp);
337 bp->b_flags &= B_ERROR;
338 }
339
340 /*
341 * Queue a tape operation.
342 */
tmstrategy(bp)343 tmstrategy(bp)
344 register struct buf *bp;
345 {
346 int teunit = TEUNIT(bp->b_dev);
347 register struct uba_ctlr *um;
348 register struct buf *dp;
349 int s;
350
351 /*
352 * Put transfer at end of unit queue
353 */
354 dp = &teutab[teunit];
355 bp->av_forw = NULL;
356 s = spl5();
357 um = tedinfo[teunit]->ui_mi;
358 if (dp->b_actf == NULL) {
359 dp->b_actf = bp;
360 /*
361 * Transport not already active...
362 * put at end of controller queue.
363 */
364 dp->b_forw = NULL;
365 if (um->um_tab.b_actf == NULL)
366 um->um_tab.b_actf = dp;
367 else
368 um->um_tab.b_actl->b_forw = dp;
369 um->um_tab.b_actl = dp;
370 } else
371 dp->b_actl->av_forw = bp;
372 dp->b_actl = bp;
373 /*
374 * If the controller is not busy, get
375 * it going.
376 */
377 if (um->um_tab.b_active == 0)
378 tmstart(um);
379 splx(s);
380 }
381
382 /*
383 * Start activity on a tm controller.
384 */
tmstart(um)385 tmstart(um)
386 register struct uba_ctlr *um;
387 {
388 register struct buf *bp, *dp;
389 register struct tmdevice *addr = (struct tmdevice *)um->um_addr;
390 register struct te_softc *sc;
391 register struct uba_device *ui;
392 int teunit, cmd;
393 daddr_t blkno;
394
395 /*
396 * Look for an idle transport on the controller.
397 */
398 loop:
399 if ((dp = um->um_tab.b_actf) == NULL)
400 return;
401 if ((bp = dp->b_actf) == NULL) {
402 um->um_tab.b_actf = dp->b_forw;
403 goto loop;
404 }
405 teunit = TEUNIT(bp->b_dev);
406 ui = tedinfo[teunit];
407 /*
408 * Record pre-transfer status (e.g. for TM_SENSE)
409 */
410 sc = &te_softc[teunit];
411 addr = (struct tmdevice *)um->um_addr;
412 addr->tmcs = (ui->ui_slave << 8);
413 sc->sc_dsreg = addr->tmcs;
414 sc->sc_erreg = addr->tmer;
415 sc->sc_resid = addr->tmbc;
416 /*
417 * Default is that last command was NOT a write command;
418 * if we do a write command we will notice this in tmintr().
419 */
420 sc->sc_lastiow = 0;
421 if (sc->sc_openf < 0 || (addr->tmcs&TM_CUR) == 0) {
422 /*
423 * Have had a hard error on a non-raw tape
424 * or the tape unit is now unavailable
425 * (e.g. taken off line).
426 */
427 bp->b_flags |= B_ERROR;
428 goto next;
429 }
430 if (bp == &ctmbuf[TMUNIT(bp->b_dev)]) {
431 /*
432 * Execute control operation with the specified count.
433 */
434 if (bp->b_command == TM_SENSE)
435 goto next;
436 /*
437 * Set next state; give 5 minutes to complete
438 * rewind, or 10 seconds per iteration (minimum 60
439 * seconds and max 5 minutes) to complete other ops.
440 */
441 if (bp->b_command == TM_REW) {
442 um->um_tab.b_active = SREW;
443 sc->sc_timo = 5 * 60;
444 } else {
445 um->um_tab.b_active = SCOM;
446 sc->sc_timo =
447 imin(imax(10*(int)-bp->b_repcnt,60),5*60);
448 }
449 if (bp->b_command == TM_SFORW || bp->b_command == TM_SREV)
450 addr->tmbc = bp->b_repcnt;
451 goto dobpcmd;
452 }
453 /*
454 * For raw I/O, fudge the current block number
455 * so we don't seek except on a retry.
456 * For raw I/O, fudge the current block number
457 * so we don't seek except on a retry.
458 */
459 if (bp->b_flags & B_RAW) {
460 if (um->um_tab.b_errcnt == 0) {
461 sc->sc_blkno = bdbtofsb(bp->b_blkno);
462 sc->sc_nxrec = sc->sc_blkno + 1;
463 }
464 } else {
465 /*
466 * Handle boundary cases for operation
467 * on non-raw tapes.
468 */
469 if (bdbtofsb(bp->b_blkno) > sc->sc_nxrec) {
470 /*
471 * Can't read past known end-of-file.
472 */
473 bp->b_flags |= B_ERROR;
474 bp->b_error = ENXIO;
475 goto next;
476 }
477 if (bdbtofsb(bp->b_blkno) == sc->sc_nxrec &&
478 bp->b_flags&B_READ) {
479 /*
480 * Reading at end of file returns 0 bytes.
481 */
482 bp->b_resid = bp->b_bcount;
483 clrbuf(bp);
484 goto next;
485 }
486 if ((bp->b_flags&B_READ) == 0)
487 /*
488 * Writing sets EOF
489 */
490 sc->sc_nxrec = bdbtofsb(bp->b_blkno) + 1;
491 }
492 /*
493 * If the data transfer command is in the correct place,
494 * set up all the registers except the csr, and give
495 * control over to the UNIBUS adapter routines, to
496 * wait for resources to start the i/o.
497 */
498 if ((blkno = sc->sc_blkno) == bdbtofsb(bp->b_blkno)) {
499 addr->tmbc = -bp->b_bcount;
500 if ((bp->b_flags&B_READ) == 0) {
501 if (um->um_tab.b_errcnt &&
502 (sc->sc_ioerreg&(TMER_HARD|TMER_SOFT)) != TMER_BGL)
503 cmd = TM_WIRG;
504 else
505 cmd = TM_WCOM;
506 } else
507 cmd = TM_RCOM;
508 um->um_tab.b_active = SIO;
509 um->um_cmd = sc->sc_dens|cmd;
510 #ifdef notdef
511 if (tmreverseop(sc->sc_lastcmd))
512 while (addr->tmer & TMER_SDWN)
513 DELAY(10),tmgapsdcnt++;
514 sc->sc_lastcmd = TM_RCOM; /* will serve */
515 #endif
516 sc->sc_timo = 60; /* premature, but should serve */
517 (void) ubago(ui);
518 return;
519 }
520 /*
521 * Tape positioned incorrectly;
522 * set to seek forwards or backwards to the correct spot.
523 * This happens for raw tapes only on error retries.
524 */
525 um->um_tab.b_active = SSEEK;
526 if (blkno < bdbtofsb(bp->b_blkno)) {
527 bp->b_command = TM_SFORW;
528 addr->tmbc = blkno - bdbtofsb(bp->b_blkno);
529 } else {
530 bp->b_command = TM_SREV;
531 addr->tmbc = bdbtofsb(bp->b_blkno) - blkno;
532 }
533 sc->sc_timo = imin(imax(10 * -addr->tmbc, 60), 5 * 60);
534 dobpcmd:
535 #ifdef notdef
536 /*
537 * It is strictly necessary to wait for the tape
538 * to stop before changing directions, but the TC11
539 * handles this for us.
540 */
541 if (tmreverseop(sc->sc_lastcmd) != tmreverseop(bp->b_command))
542 while (addr->tmer & TM_SDWN)
543 DELAY(10),tmgapsdcnt++;
544 sc->sc_lastcmd = bp->b_command;
545 #endif
546 /*
547 * Do the command in bp.
548 */
549 addr->tmcs = (sc->sc_dens | bp->b_command);
550 return;
551
552 next:
553 /*
554 * Done with this operation due to error or
555 * the fact that it doesn't do anything.
556 * Release UBA resources (if any), dequeue
557 * the transfer and continue processing this slave.
558 */
559 if (um->um_ubinfo)
560 ubadone(um);
561 um->um_tab.b_errcnt = 0;
562 dp->b_actf = bp->av_forw;
563 iodone(bp);
564 goto loop;
565 }
566
567 /*
568 * The UNIBUS resources we needed have been
569 * allocated to us; start the device.
570 */
tmdgo(um)571 tmdgo(um)
572 register struct uba_ctlr *um;
573 {
574 register struct tmdevice *addr = (struct tmdevice *)um->um_addr;
575
576 addr->tmba = um->um_ubinfo;
577 addr->tmcs = um->um_cmd | ((um->um_ubinfo >> 12) & 0x30);
578 }
579
580 /*
581 * Tm interrupt routine.
582 */
583 /*ARGSUSED*/
tmintr(tm11)584 tmintr(tm11)
585 int tm11;
586 {
587 struct buf *dp;
588 register struct buf *bp;
589 register struct uba_ctlr *um = tmminfo[tm11];
590 register struct tmdevice *addr;
591 register struct te_softc *sc;
592 int teunit;
593 register state;
594
595 if ((dp = um->um_tab.b_actf) == NULL)
596 return;
597 bp = dp->b_actf;
598 teunit = TEUNIT(bp->b_dev);
599 addr = (struct tmdevice *)tedinfo[teunit]->ui_addr;
600 sc = &te_softc[teunit];
601 /*
602 * If last command was a rewind, and tape is still
603 * rewinding, wait for the rewind complete interrupt.
604 */
605 if (um->um_tab.b_active == SREW) {
606 um->um_tab.b_active = SCOM;
607 if (addr->tmer&TMER_RWS) {
608 sc->sc_timo = 5*60; /* 5 minutes */
609 return;
610 }
611 }
612 /*
613 * An operation completed... record status
614 */
615 sc->sc_timo = INF;
616 if (um->um_tab.b_active == SIO)
617 if (um->um_tab.b_active == SIO)
618 sc->sc_ioerreg = addr->tmer;
619 sc->sc_dsreg = addr->tmcs;
620 sc->sc_erreg = addr->tmer;
621 sc->sc_resid = addr->tmbc;
622 if ((bp->b_flags & B_READ) == 0)
623 sc->sc_lastiow = 1;
624 state = um->um_tab.b_active;
625 um->um_tab.b_active = 0;
626 /*
627 * Check for errors.
628 */
629 if (addr->tmcs&TM_ERR) {
630 while (addr->tmer & TMER_SDWN)
631 DELAY(10); /* await settle down */
632 /*
633 * If we hit the end of the tape file, update our position.
634 */
635 if (addr->tmer&TMER_EOF) {
636 tmseteof(bp); /* set blkno and nxrec */
637 state = SCOM; /* force completion */
638 /*
639 * Stuff bc so it will be unstuffed correctly
640 * later to get resid.
641 */
642 addr->tmbc = -bp->b_bcount;
643 goto opdone;
644 }
645 /*
646 * If we were reading raw tape and the only error was that the
647 * record was too long, then we don't consider this an error.
648 */
649 if ((bp->b_flags & (B_READ|B_RAW)) == (B_READ|B_RAW) &&
650 (addr->tmer&(TMER_HARD|TMER_SOFT)) == TMER_RLE)
651 goto ignoreerr;
652 /*
653 * If error is not hard, and this was an i/o operation
654 * retry up to 8 times.
655 */
656 if ((addr->tmer&TMER_HARD)==0 && state==SIO) {
657 if (um->um_tab.b_errcnt++ < 8) {
658 if (tmdiag)
659 log(LOG_DEBUG,
660 "te%d: soft error bn%d er=%b\n",
661 minor(bp->b_dev)&03,
662 bp->b_blkno, sc->sc_erreg,
663 TMER_BITS);
664 sc->sc_blkno++; /* force backspace */
665 ubadone(um);
666 goto opcont;
667 }
668 } else
669 /*
670 * Hard or non-i/o errors on non-raw tape
671 * cause it to close.
672 */
673 if ((bp->b_flags&B_RAW) == 0 && sc->sc_openf > 0)
674 sc->sc_openf = -1;
675 /*
676 * Couldn't recover error
677 */
678 tprintf(sc->sc_tpr,
679 "te%d: hard error bn%d er=%b\n", minor(bp->b_dev)&03,
680 bp->b_blkno, sc->sc_erreg, TMER_BITS);
681 #ifdef AVIV
682 if (tmdiag) {
683 addr->tmmr = DAB;
684 printf("reject code 0%o", addr->tmmr & DAB_MASK);
685 addr->tmmr = DTS;
686 if (addr->tmmr & DTS_MASK)
687 printf(", dead track 0%o", addr->tmmr & DTS_MASK);
688 addr->tmmr = RWERR;
689 printf(", read/write errors %b\n",
690 addr->tmmr & RWERR_MASK,
691 RWERR_BITS);
692 addr->tmmr = DRSENSE;
693 printf("drive sense %b, ", addr->tmmr & DRSENSE_MASK,
694 DRSENSE_BITS);
695 printf("fsr %b\n", addr->tmfsr, FSR_BITS);
696 }
697 #endif AVIV
698 bp->b_flags |= B_ERROR;
699 goto opdone;
700 }
701 /*
702 * Advance tape control FSM.
703 */
704 ignoreerr:
705 switch (state) {
706
707 case SIO:
708 /*
709 * Read/write increments tape block number
710 */
711 sc->sc_blkno++;
712 sc->sc_blks++;
713 if (um->um_tab.b_errcnt)
714 sc->sc_softerrs++;
715 goto opdone;
716
717 case SCOM:
718 /*
719 * For forward/backward space record update current position.
720 */
721 if (bp == &ctmbuf[TMUNIT(bp->b_dev)])
722 switch ((int)bp->b_command) {
723
724 case TM_SFORW:
725 sc->sc_blkno -= bp->b_repcnt;
726 break;
727
728 case TM_SREV:
729 sc->sc_blkno += bp->b_repcnt;
730 break;
731 }
732 goto opdone;
733
734 case SSEEK:
735 sc->sc_blkno = bdbtofsb(bp->b_blkno);
736 goto opcont;
737
738 default:
739 panic("tmintr");
740 }
741 opdone:
742 /*
743 * Reset error count and remove
744 * from device queue.
745 */
746 um->um_tab.b_errcnt = 0;
747 dp->b_actf = bp->av_forw;
748 /*
749 * Check resid; watch out for resid >32767 (tmbc not negative).
750 */
751 bp->b_resid = ((int) -addr->tmbc) & 0xffff;
752 ubadone(um);
753 iodone(bp);
754 /*
755 * Circulate slave to end of controller
756 * queue to give other slaves a chance.
757 */
758 um->um_tab.b_actf = dp->b_forw;
759 if (dp->b_actf) {
760 dp->b_forw = NULL;
761 if (um->um_tab.b_actf == NULL)
762 um->um_tab.b_actf = dp;
763 else
764 um->um_tab.b_actl->b_forw = dp;
765 um->um_tab.b_actl = dp;
766 }
767 if (um->um_tab.b_actf == 0)
768 return;
769 opcont:
770 tmstart(um);
771 }
772
tmtimer(dev)773 tmtimer(dev)
774 int dev;
775 {
776 register struct te_softc *sc = &te_softc[TEUNIT(dev)];
777 register short x;
778
779 if (sc->sc_timo != INF && (sc->sc_timo -= 5) < 0) {
780 printf("te%d: lost interrupt\n", TEUNIT(dev));
781 sc->sc_timo = INF;
782 x = spl5();
783 tmintr(TMUNIT(dev));
784 (void) splx(x);
785 }
786 timeout(tmtimer, (caddr_t)dev, 5*hz);
787 }
788
tmseteof(bp)789 tmseteof(bp)
790 register struct buf *bp;
791 {
792 register int teunit = TEUNIT(bp->b_dev);
793 register struct tmdevice *addr =
794 (struct tmdevice *)tedinfo[teunit]->ui_addr;
795 register struct te_softc *sc = &te_softc[teunit];
796
797 if (bp == &ctmbuf[TMUNIT(bp->b_dev)]) {
798 if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) {
799 /* reversing */
800 sc->sc_nxrec = bdbtofsb(bp->b_blkno) - addr->tmbc;
801 sc->sc_blkno = sc->sc_nxrec;
802 } else {
803 /* spacing forward */
804 sc->sc_blkno = bdbtofsb(bp->b_blkno) + addr->tmbc;
805 sc->sc_nxrec = sc->sc_blkno - 1;
806 }
807 return;
808 }
809 /* eof on read */
810 sc->sc_nxrec = bdbtofsb(bp->b_blkno);
811 }
812
tmreset(uban)813 tmreset(uban)
814 int uban;
815 {
816 register struct uba_ctlr *um;
817 register tm11, teunit;
818 register struct uba_device *ui;
819 register struct buf *dp;
820
821 for (tm11 = 0; tm11 < NTM; tm11++) {
822 if ((um = tmminfo[tm11]) == 0 || um->um_alive == 0 ||
823 um->um_ubanum != uban)
824 continue;
825 printf(" tm%d", tm11);
826 um->um_tab.b_active = 0;
827 um->um_tab.b_actf = um->um_tab.b_actl = 0;
828 if (um->um_ubinfo) {
829 printf("<%d>", (um->um_ubinfo>>28)&0xf);
830 um->um_ubinfo = 0;
831 }
832 ((struct tmdevice *)(um->um_addr))->tmcs = TM_DCLR;
833 for (teunit = 0; teunit < NTE; teunit++) {
834 if ((ui = tedinfo[teunit]) == 0 || ui->ui_mi != um ||
835 ui->ui_alive == 0)
836 continue;
837 dp = &teutab[teunit];
838 dp->b_active = 0;
839 dp->b_forw = 0;
840 if (um->um_tab.b_actf == NULL)
841 um->um_tab.b_actf = dp;
842 else
843 um->um_tab.b_actl->b_forw = dp;
844 um->um_tab.b_actl = dp;
845 if (te_softc[teunit].sc_openf > 0)
846 te_softc[teunit].sc_openf = -1;
847 }
848 tmstart(um);
849 }
850 }
851
852 /*ARGSUSED*/
tmioctl(dev,cmd,data,flag)853 tmioctl(dev, cmd, data, flag)
854 caddr_t data;
855 dev_t dev;
856 {
857 int teunit = TEUNIT(dev);
858 register struct te_softc *sc = &te_softc[teunit];
859 register struct buf *bp = &ctmbuf[TMUNIT(dev)];
860 register callcount;
861 int fcount, error = 0;
862 struct mtop *mtop;
863 struct mtget *mtget;
864 /* we depend of the values and order of the MT codes here */
865 static tmops[] =
866 {TM_WEOF,TM_SFORW,TM_SREV,TM_SFORW,TM_SREV,TM_REW,TM_OFFL,TM_SENSE};
867
868 switch (cmd) {
869
870 case MTIOCTOP: /* tape operation */
871 mtop = (struct mtop *)data;
872 switch (mtop->mt_op) {
873
874 case MTWEOF:
875 callcount = mtop->mt_count;
876 fcount = 1;
877 break;
878
879 case MTFSF: case MTBSF:
880 callcount = mtop->mt_count;
881 fcount = INF;
882 break;
883
884 case MTFSR: case MTBSR:
885 callcount = 1;
886 fcount = mtop->mt_count;
887 break;
888
889 case MTREW: case MTOFFL: case MTNOP:
890 callcount = 1;
891 fcount = 1;
892 break;
893
894 default:
895 return (ENXIO);
896 }
897 if (callcount <= 0 || fcount <= 0)
898 return (EINVAL);
899 while (--callcount >= 0) {
900 tmcommand(dev, tmops[mtop->mt_op], fcount);
901 if ((mtop->mt_op == MTFSR || mtop->mt_op == MTBSR) &&
902 bp->b_resid)
903 return (EIO);
904 if ((bp->b_flags&B_ERROR) || sc->sc_erreg&TMER_BOT)
905 break;
906 }
907 if (bp->b_flags&B_ERROR)
908 if ((error = bp->b_error)==0)
909 return (EIO);
910 return (error);
911
912 case MTIOCGET:
913 mtget = (struct mtget *)data;
914 mtget->mt_dsreg = sc->sc_dsreg;
915 mtget->mt_erreg = sc->sc_erreg;
916 mtget->mt_resid = sc->sc_resid;
917 mtget->mt_type = MT_ISTM;
918 break;
919
920 default:
921 return (ENXIO);
922 }
923 return (0);
924 }
925
926 #define DBSIZE 20
927
tmdump()928 tmdump()
929 {
930 register struct uba_device *ui;
931 register struct uba_regs *up;
932 register struct tmdevice *addr;
933 int blk, num;
934 int start;
935
936 start = 0;
937 num = maxfree;
938 #define phys(a,b) ((b)((int)(a)&0x7fffffff))
939 if (tedinfo[0] == 0)
940 return (ENXIO);
941 ui = phys(tedinfo[0], struct uba_device *);
942 up = phys(ui->ui_hd, struct uba_hd *)->uh_physuba;
943 ubainit(up);
944 DELAY(1000000);
945 addr = (struct tmdevice *)ui->ui_physaddr;
946 tmwait(addr);
947 addr->tmcs = TM_DCLR | TM_GO;
948 while (num > 0) {
949 blk = num > DBSIZE ? DBSIZE : num;
950 tmdwrite(start, blk, addr, up);
951 start += blk;
952 num -= blk;
953 }
954 tmeof(addr);
955 tmeof(addr);
956 tmwait(addr);
957 if (addr->tmcs&TM_ERR)
958 return (EIO);
959 addr->tmcs = TM_REW | TM_GO;
960 tmwait(addr);
961 return (0);
962 }
963
tmdwrite(dbuf,num,addr,up)964 tmdwrite(dbuf, num, addr, up)
965 register dbuf, num;
966 register struct tmdevice *addr;
967 struct uba_regs *up;
968 {
969 register struct pte *io;
970 register int npf;
971
972 tmwait(addr);
973 io = up->uba_map;
974 npf = num+1;
975 while (--npf != 0)
976 *(int *)io++ = (dbuf++ | (1<<UBAMR_DPSHIFT) | UBAMR_MRV);
977 *(int *)io = 0;
978 addr->tmbc = -(num*NBPG);
979 addr->tmba = 0;
980 addr->tmcs = TM_WCOM | TM_GO;
981 }
982
tmwait(addr)983 tmwait(addr)
984 register struct tmdevice *addr;
985 {
986 register s;
987
988 do
989 s = addr->tmcs;
990 while ((s & TM_CUR) == 0);
991 }
992
993 tmeof(addr)
994 struct tmdevice *addr;
995 {
996
997 tmwait(addr);
998 addr->tmcs = TM_WEOF | TM_GO;
999 }
1000 #endif
1001