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1.1 root 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 7.4 (Berkeley) 5/6/88
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 "param.h"
22: #include "systm.h"
23: #include "buf.h"
24: #include "dir.h"
25: #include "conf.h"
26: #include "user.h"
27: #include "file.h"
28: #include "map.h"
29: #include "vm.h"
30: #include "ioctl.h"
31: #include "mtio.h"
32: #include "cmap.h"
33: #include "uio.h"
34: #include "kernel.h"
35: #include "tty.h"
36: #include "syslog.h"
37:
38: #include "../machine/pte.h"
39: #include "../vax/cpu.h"
40: #include "ubareg.h"
41: #include "ubavar.h"
42: #include "tmreg.h"
43:
44: /*
45: * There is a ctmbuf per tape controller.
46: * It is used as the token to pass to the internal routines
47: * to execute tape ioctls, and also acts as a lock on the slaves
48: * on the controller, since there is only one per controller.
49: * In particular, when the tape is rewinding on close we release
50: * the user process but any further attempts to use the tape drive
51: * before the rewind completes will hang waiting for ctmbuf.
52: */
53: struct buf ctmbuf[NTM];
54:
55: /*
56: * Driver unibus interface routines and variables.
57: */
58: int tmprobe(), tmslave(), tmattach(), tmdgo(), tmintr();
59: struct uba_ctlr *tmminfo[NTM];
60: struct uba_device *tedinfo[NTE];
61: struct buf teutab[NTE];
62: short tetotm[NTE];
63: u_short tmstd[] = { 0772520, 0 };
64: struct uba_driver tmdriver =
65: { tmprobe, tmslave, tmattach, tmdgo, tmstd, "te", tedinfo, "tm", tmminfo, 0 };
66:
67: /* bits in minor device */
68: #define TEUNIT(dev) (minor(dev)&03)
69: #define TMUNIT(dev) (tetotm[TEUNIT(dev)])
70: #define T_NOREWIND 04
71: #define T_1600BPI 0x8
72:
73: #define INF (daddr_t)1000000L
74:
75: /*
76: * Software state per tape transport.
77: *
78: * 1. A tape drive is a unique-open device; we refuse opens when it is already.
79: * 2. We keep track of the current position on a block tape and seek
80: * before operations by forward/back spacing if necessary.
81: * 3. We remember if the last operation was a write on a tape, so if a tape
82: * is open read write and the last thing done is a write we can
83: * write a standard end of tape mark (two eofs).
84: * 4. We remember the status registers after the last command, using
85: * then internally and returning them to the SENSE ioctl.
86: * 5. We remember the last density the tape was used at. If it is
87: * not a BOT when we start using it and we are writing, we don't
88: * let the density be changed.
89: */
90: struct te_softc {
91: char sc_openf; /* lock against multiple opens */
92: char sc_lastiow; /* last op was a write */
93: daddr_t sc_blkno; /* block number, for block device tape */
94: daddr_t sc_nxrec; /* position of end of tape, if known */
95: u_short sc_erreg; /* copy of last erreg */
96: u_short sc_ioerreg; /* copy of last erreg for I/O command */
97: u_short sc_dsreg; /* copy of last dsreg */
98: short sc_resid; /* copy of last bc */
99: #ifdef unneeded
100: short sc_lastcmd; /* last command to handle direction changes */
101: #endif
102: u_short sc_dens; /* prototype command with density info */
103: short sc_tact; /* timeout is active */
104: daddr_t sc_timo; /* time until timeout expires */
105: int sc_blks; /* number of I/O operations since open */
106: int sc_softerrs; /* number of soft I/O errors since open */
107: struct tty *sc_ttyp; /* record user's tty for errors */
108: } te_softc[NTE];
109: #ifdef unneeded
110: int tmgapsdcnt; /* DEBUG */
111: #endif
112:
113: /*
114: * States for um->um_tab.b_active, the per controller state flag.
115: * This is used to sequence control in the driver.
116: */
117: #define SSEEK 1 /* seeking */
118: #define SIO 2 /* doing seq i/o */
119: #define SCOM 3 /* sending control command */
120: #define SREW 4 /* sending a drive rewind */
121:
122: /*
123: * Determine if there is a controller for
124: * a tm at address reg. Our goal is to make the
125: * device interrupt.
126: */
127: tmprobe(reg)
128: caddr_t reg;
129: {
130: register int br, cvec; /* must be r11,r10; value-result */
131:
132: #ifdef lint
133: br = 0; cvec = br; br = cvec;
134: tmintr(0);
135: #endif
136: ((struct tmdevice *)reg)->tmcs = TM_IE;
137: /*
138: * If this is a tm11, it ought to have interrupted
139: * by now, if it isn't (ie: it is a ts04) then we just
140: * hope that it didn't interrupt, so autoconf will ignore it.
141: * Just in case, we will reference one
142: * of the more distant registers, and hope for a machine
143: * check, or similar disaster if this is a ts.
144: *
145: * Note: on an 11/780, badaddr will just generate
146: * a uba error for a ts; but our caller will notice that
147: * so we won't check for it.
148: */
149: if (badaddr((caddr_t)&((struct tmdevice *)reg)->tmrd, 2))
150: return (0);
151: return (sizeof (struct tmdevice));
152: }
153:
154: /*
155: * Due to a design flaw, we cannot ascertain if the tape
156: * exists or not unless it is on line - ie: unless a tape is
157: * mounted. This is too servere a restriction to bear,
158: * so all units are assumed to exist.
159: */
160: /*ARGSUSED*/
161: tmslave(ui, reg)
162: struct uba_device *ui;
163: caddr_t reg;
164: {
165:
166: return (1);
167: }
168:
169: /*
170: * Record attachment of the unit to the controller.
171: */
172: /*ARGSUSED*/
173: tmattach(ui)
174: struct uba_device *ui;
175: {
176: /*
177: * Tetotm is used in TMUNIT to index the ctmbuf
178: * array given a te unit number.
179: */
180: tetotm[ui->ui_unit] = ui->ui_mi->um_ctlr;
181: }
182:
183: int tmtimer();
184: /*
185: * Open the device. Tapes are unique open
186: * devices, so we refuse if it is already open.
187: * We also check that a tape is available, and
188: * don't block waiting here; if you want to wait
189: * for a tape you should timeout in user code.
190: */
191:
192: #ifdef AVIV
193: int tmdens[4] = { 0x6000, 0x0000, 0x2000, 0 };
194: #endif AVIV
195: int tmdiag;
196:
197: tmopen(dev, flag)
198: dev_t dev;
199: int flag;
200: {
201: register int teunit;
202: register struct uba_device *ui;
203: register struct te_softc *sc;
204: int olddens, dens;
205: int s;
206:
207: teunit = TEUNIT(dev);
208: if (teunit>=NTE || (ui = tedinfo[teunit]) == 0 || ui->ui_alive == 0)
209: return (ENXIO);
210: if ((sc = &te_softc[teunit])->sc_openf)
211: return (EBUSY);
212: sc->sc_openf = 1;
213: olddens = sc->sc_dens;
214: dens = TM_IE | TM_GO | (ui->ui_slave << 8);
215: #ifndef AVIV
216: if ((minor(dev) & T_1600BPI) == 0)
217: dens |= TM_D800;
218: #else AVIV
219: dens |= tmdens[(minor(dev)>>3)&03];
220: #endif AVIV
221: sc->sc_dens = dens;
222: get:
223: tmcommand(dev, TM_SENSE, 1);
224: if (sc->sc_erreg&TMER_SDWN) {
225: sleep((caddr_t)&lbolt, PZERO+1);
226: goto get;
227: }
228: sc->sc_dens = olddens;
229: if ((sc->sc_erreg&(TMER_SELR|TMER_TUR)) != (TMER_SELR|TMER_TUR)) {
230: uprintf("te%d: not online\n", teunit);
231: sc->sc_openf = 0;
232: return (EIO);
233: }
234: if ((flag&FWRITE) && (sc->sc_erreg&TMER_WRL)) {
235: uprintf("te%d: no write ring\n", teunit);
236: sc->sc_openf = 0;
237: return (EIO);
238: }
239: if ((sc->sc_erreg&TMER_BOT) == 0 && (flag&FWRITE) &&
240: dens != sc->sc_dens) {
241: uprintf("te%d: can't change density in mid-tape\n", teunit);
242: sc->sc_openf = 0;
243: return (EIO);
244: }
245: sc->sc_blkno = (daddr_t)0;
246: sc->sc_nxrec = INF;
247: sc->sc_lastiow = 0;
248: sc->sc_dens = dens;
249: sc->sc_blks = 0;
250: sc->sc_softerrs = 0;
251: sc->sc_ttyp = u.u_ttyp;
252: s = splclock();
253: if (sc->sc_tact == 0) {
254: sc->sc_timo = INF;
255: sc->sc_tact = 1;
256: timeout(tmtimer, (caddr_t)dev, 5*hz);
257: }
258: splx(s);
259: return (0);
260: }
261:
262: /*
263: * Close tape device.
264: *
265: * If tape was open for writing or last operation was
266: * a write, then write two EOF's and backspace over the last one.
267: * Unless this is a non-rewinding special file, rewind the tape.
268: * Make the tape available to others.
269: */
270: tmclose(dev, flag)
271: register dev_t dev;
272: register flag;
273: {
274: register struct te_softc *sc = &te_softc[TEUNIT(dev)];
275:
276: if (flag == FWRITE || (flag&FWRITE) && sc->sc_lastiow) {
277: tmcommand(dev, TM_WEOF, 1);
278: tmcommand(dev, TM_WEOF, 1);
279: tmcommand(dev, TM_SREV, 1);
280: }
281: if ((minor(dev)&T_NOREWIND) == 0)
282: /*
283: * 0 count means don't hang waiting for rewind complete
284: * rather ctmbuf stays busy until the operation completes
285: * preventing further opens from completing by
286: * preventing a TM_SENSE from completing.
287: */
288: tmcommand(dev, TM_REW, 0);
289: if (sc->sc_blks > 100 && sc->sc_softerrs > sc->sc_blks / 100)
290: log(LOG_INFO, "te%d: %d soft errors in %d blocks\n",
291: TEUNIT(dev), sc->sc_softerrs, sc->sc_blks);
292: sc->sc_openf = 0;
293: return (0);
294: }
295:
296: /*
297: * Execute a command on the tape drive
298: * a specified number of times.
299: */
300: tmcommand(dev, com, count)
301: dev_t dev;
302: int com, count;
303: {
304: register struct buf *bp;
305: register int s;
306:
307: bp = &ctmbuf[TMUNIT(dev)];
308: s = spl5();
309: while (bp->b_flags&B_BUSY) {
310: /*
311: * This special check is because B_BUSY never
312: * gets cleared in the non-waiting rewind case.
313: */
314: if (bp->b_repcnt == 0 && (bp->b_flags&B_DONE))
315: break;
316: bp->b_flags |= B_WANTED;
317: sleep((caddr_t)bp, PRIBIO);
318: }
319: bp->b_flags = B_BUSY|B_READ;
320: splx(s);
321: bp->b_dev = dev;
322: bp->b_repcnt = -count;
323: bp->b_command = com;
324: bp->b_blkno = 0;
325: tmstrategy(bp);
326: /*
327: * In case of rewind from close, don't wait.
328: * This is the only case where count can be 0.
329: */
330: if (count == 0)
331: return;
332: iowait(bp);
333: if (bp->b_flags&B_WANTED)
334: wakeup((caddr_t)bp);
335: bp->b_flags &= B_ERROR;
336: }
337:
338: /*
339: * Queue a tape operation.
340: */
341: tmstrategy(bp)
342: register struct buf *bp;
343: {
344: int teunit = TEUNIT(bp->b_dev);
345: register struct uba_ctlr *um;
346: register struct buf *dp;
347: int s;
348:
349: /*
350: * Put transfer at end of unit queue
351: */
352: dp = &teutab[teunit];
353: bp->av_forw = NULL;
354: s = spl5();
355: um = tedinfo[teunit]->ui_mi;
356: if (dp->b_actf == NULL) {
357: dp->b_actf = bp;
358: /*
359: * Transport not already active...
360: * put at end of controller queue.
361: */
362: dp->b_forw = NULL;
363: if (um->um_tab.b_actf == NULL)
364: um->um_tab.b_actf = dp;
365: else
366: um->um_tab.b_actl->b_forw = dp;
367: um->um_tab.b_actl = dp;
368: } else
369: dp->b_actl->av_forw = bp;
370: dp->b_actl = bp;
371: /*
372: * If the controller is not busy, get
373: * it going.
374: */
375: if (um->um_tab.b_active == 0)
376: tmstart(um);
377: splx(s);
378: }
379:
380: /*
381: * Start activity on a tm controller.
382: */
383: tmstart(um)
384: register struct uba_ctlr *um;
385: {
386: register struct buf *bp, *dp;
387: register struct tmdevice *addr = (struct tmdevice *)um->um_addr;
388: register struct te_softc *sc;
389: register struct uba_device *ui;
390: int teunit, cmd;
391: daddr_t blkno;
392:
393: /*
394: * Look for an idle transport on the controller.
395: */
396: loop:
397: if ((dp = um->um_tab.b_actf) == NULL)
398: return;
399: if ((bp = dp->b_actf) == NULL) {
400: um->um_tab.b_actf = dp->b_forw;
401: goto loop;
402: }
403: teunit = TEUNIT(bp->b_dev);
404: ui = tedinfo[teunit];
405: /*
406: * Record pre-transfer status (e.g. for TM_SENSE)
407: */
408: sc = &te_softc[teunit];
409: addr = (struct tmdevice *)um->um_addr;
410: addr->tmcs = (ui->ui_slave << 8);
411: sc->sc_dsreg = addr->tmcs;
412: sc->sc_erreg = addr->tmer;
413: sc->sc_resid = addr->tmbc;
414: /*
415: * Default is that last command was NOT a write command;
416: * if we do a write command we will notice this in tmintr().
417: */
418: sc->sc_lastiow = 0;
419: if (sc->sc_openf < 0 || (addr->tmcs&TM_CUR) == 0) {
420: /*
421: * Have had a hard error on a non-raw tape
422: * or the tape unit is now unavailable
423: * (e.g. taken off line).
424: */
425: bp->b_flags |= B_ERROR;
426: goto next;
427: }
428: if (bp == &ctmbuf[TMUNIT(bp->b_dev)]) {
429: /*
430: * Execute control operation with the specified count.
431: */
432: if (bp->b_command == TM_SENSE)
433: goto next;
434: /*
435: * Set next state; give 5 minutes to complete
436: * rewind, or 10 seconds per iteration (minimum 60
437: * seconds and max 5 minutes) to complete other ops.
438: */
439: if (bp->b_command == TM_REW) {
440: um->um_tab.b_active = SREW;
441: sc->sc_timo = 5 * 60;
442: } else {
443: um->um_tab.b_active = SCOM;
444: sc->sc_timo =
445: imin(imax(10*(int)-bp->b_repcnt,60),5*60);
446: }
447: if (bp->b_command == TM_SFORW || bp->b_command == TM_SREV)
448: addr->tmbc = bp->b_repcnt;
449: goto dobpcmd;
450: }
451: /*
452: * For raw I/O, save the current block
453: * number in case we have to retry.
454: */
455: if (bp->b_flags & B_RAW) {
456: if (um->um_tab.b_errcnt == 0) {
457: sc->sc_blkno = bdbtofsb(bp->b_blkno);
458: sc->sc_nxrec = sc->sc_blkno + 1;
459: }
460: }
461: else {
462: /*
463: * Handle boundary cases for operation
464: * on non-raw tapes.
465: */
466: if (bdbtofsb(bp->b_blkno) > sc->sc_nxrec) {
467: /*
468: * Can't read past known end-of-file.
469: */
470: bp->b_flags |= B_ERROR;
471: bp->b_error = ENXIO;
472: goto next;
473: }
474: if (bdbtofsb(bp->b_blkno) == sc->sc_nxrec &&
475: bp->b_flags&B_READ) {
476: /*
477: * Reading at end of file returns 0 bytes.
478: */
479: bp->b_resid = bp->b_bcount;
480: clrbuf(bp);
481: goto next;
482: }
483: if ((bp->b_flags&B_READ) == 0)
484: /*
485: * Writing sets EOF
486: */
487: sc->sc_nxrec = bdbtofsb(bp->b_blkno) + 1;
488: }
489: /*
490: * If the data transfer command is in the correct place,
491: * set up all the registers except the csr, and give
492: * control over to the UNIBUS adapter routines, to
493: * wait for resources to start the i/o.
494: */
495: if ((blkno = sc->sc_blkno) == bdbtofsb(bp->b_blkno)) {
496: addr->tmbc = -bp->b_bcount;
497: if ((bp->b_flags&B_READ) == 0) {
498: if (um->um_tab.b_errcnt &&
499: (sc->sc_ioerreg&(TMER_HARD|TMER_SOFT)) != TMER_BGL)
500: cmd = TM_WIRG;
501: else
502: cmd = TM_WCOM;
503: } else
504: cmd = TM_RCOM;
505: um->um_tab.b_active = SIO;
506: um->um_cmd = sc->sc_dens|cmd;
507: #ifdef notdef
508: if (tmreverseop(sc->sc_lastcmd))
509: while (addr->tmer & TMER_SDWN)
510: DELAY(10),tmgapsdcnt++;
511: sc->sc_lastcmd = TM_RCOM; /* will serve */
512: #endif
513: sc->sc_timo = 60; /* premature, but should serve */
514: (void) ubago(ui);
515: return;
516: }
517: /*
518: * Tape positioned incorrectly;
519: * set to seek forwards or backwards to the correct spot.
520: * This happens for raw tapes only on error retries.
521: */
522: um->um_tab.b_active = SSEEK;
523: if (blkno < bdbtofsb(bp->b_blkno)) {
524: bp->b_command = TM_SFORW;
525: addr->tmbc = blkno - bdbtofsb(bp->b_blkno);
526: } else {
527: bp->b_command = TM_SREV;
528: addr->tmbc = bdbtofsb(bp->b_blkno) - blkno;
529: }
530: sc->sc_timo = imin(imax(10 * -addr->tmbc, 60), 5 * 60);
531: dobpcmd:
532: #ifdef notdef
533: /*
534: * It is strictly necessary to wait for the tape
535: * to stop before changing directions, but the TC11
536: * handles this for us.
537: */
538: if (tmreverseop(sc->sc_lastcmd) != tmreverseop(bp->b_command))
539: while (addr->tmer & TM_SDWN)
540: DELAY(10),tmgapsdcnt++;
541: sc->sc_lastcmd = bp->b_command;
542: #endif
543: /*
544: * Do the command in bp.
545: */
546: addr->tmcs = (sc->sc_dens | bp->b_command);
547: return;
548:
549: next:
550: /*
551: * Done with this operation due to error or
552: * the fact that it doesn't do anything.
553: * Release UBA resources (if any), dequeue
554: * the transfer and continue processing this slave.
555: */
556: if (um->um_ubinfo)
557: ubadone(um);
558: um->um_tab.b_errcnt = 0;
559: dp->b_actf = bp->av_forw;
560: iodone(bp);
561: goto loop;
562: }
563:
564: /*
565: * The UNIBUS resources we needed have been
566: * allocated to us; start the device.
567: */
568: tmdgo(um)
569: register struct uba_ctlr *um;
570: {
571: register struct tmdevice *addr = (struct tmdevice *)um->um_addr;
572:
573: addr->tmba = um->um_ubinfo;
574: addr->tmcs = um->um_cmd | ((um->um_ubinfo >> 12) & 0x30);
575: }
576:
577: /*
578: * Tm interrupt routine.
579: */
580: /*ARGSUSED*/
581: tmintr(tm11)
582: int tm11;
583: {
584: struct buf *dp;
585: register struct buf *bp;
586: register struct uba_ctlr *um = tmminfo[tm11];
587: register struct tmdevice *addr;
588: register struct te_softc *sc;
589: int teunit;
590: register state;
591:
592: if ((dp = um->um_tab.b_actf) == NULL)
593: return;
594: bp = dp->b_actf;
595: teunit = TEUNIT(bp->b_dev);
596: addr = (struct tmdevice *)tedinfo[teunit]->ui_addr;
597: sc = &te_softc[teunit];
598: /*
599: * If last command was a rewind, and tape is still
600: * rewinding, wait for the rewind complete interrupt.
601: */
602: if (um->um_tab.b_active == SREW) {
603: um->um_tab.b_active = SCOM;
604: if (addr->tmer&TMER_RWS) {
605: sc->sc_timo = 5*60; /* 5 minutes */
606: return;
607: }
608: }
609: /*
610: * An operation completed... record status
611: */
612: sc->sc_timo = INF;
613: if (um->um_tab.b_active = SIO)
614: sc->sc_ioerreg = addr->tmer;
615: sc->sc_dsreg = addr->tmcs;
616: sc->sc_erreg = addr->tmer;
617: sc->sc_resid = addr->tmbc;
618: if ((bp->b_flags & B_READ) == 0)
619: sc->sc_lastiow = 1;
620: state = um->um_tab.b_active;
621: um->um_tab.b_active = 0;
622: /*
623: * Check for errors.
624: */
625: if (addr->tmcs&TM_ERR) {
626: while (addr->tmer & TMER_SDWN)
627: DELAY(10); /* await settle down */
628: /*
629: * If we hit the end of the tape file, update our position.
630: */
631: if (addr->tmer&TMER_EOF) {
632: tmseteof(bp); /* set blkno and nxrec */
633: state = SCOM; /* force completion */
634: /*
635: * Stuff bc so it will be unstuffed correctly
636: * later to get resid.
637: */
638: addr->tmbc = -bp->b_bcount;
639: goto opdone;
640: }
641: /*
642: * If we were reading raw tape and the only error was that the
643: * record was too long, then we don't consider this an error.
644: */
645: if ((bp->b_flags & (B_READ|B_RAW)) == (B_READ|B_RAW) &&
646: (addr->tmer&(TMER_HARD|TMER_SOFT)) == TMER_RLE)
647: goto ignoreerr;
648: /*
649: * If error is not hard, and this was an i/o operation
650: * retry up to 8 times.
651: */
652: if ((addr->tmer&TMER_HARD)==0 && state==SIO) {
653: if (++um->um_tab.b_errcnt < 7) {
654: if (tmdiag)
655: log(LOG_DEBUG,
656: "te%d: soft error bn%d er=%b\n",
657: minor(bp->b_dev)&03,
658: bp->b_blkno, sc->sc_erreg,
659: TMER_BITS);
660: sc->sc_blkno++;
661: ubadone(um);
662: goto opcont;
663: }
664: } else
665: /*
666: * Hard or non-i/o errors on non-raw tape
667: * cause it to close.
668: */
669: if ((bp->b_flags&B_RAW) == 0 && sc->sc_openf > 0)
670: sc->sc_openf = -1;
671: /*
672: * Couldn't recover error
673: */
674: tprintf(sc->sc_ttyp,
675: "te%d: hard error bn%d er=%b\n", minor(bp->b_dev)&03,
676: bp->b_blkno, sc->sc_erreg, TMER_BITS);
677: #ifdef AVIV
678: if (tmdiag) {
679: addr->tmmr = DAB;
680: printf("reject code 0%o", addr->tmmr & DAB_MASK);
681: addr->tmmr = DTS;
682: if (addr->tmmr & DTS_MASK)
683: printf(", dead track 0%o", addr->tmmr & DTS_MASK);
684: addr->tmmr = RWERR;
685: printf(", read/write errors %b\n",
686: addr->tmmr & RWERR_MASK,
687: RWERR_BITS);
688: addr->tmmr = DRSENSE;
689: printf("drive sense %b, ", addr->tmmr & DRSENSE_MASK,
690: DRSENSE_BITS);
691: printf("fsr %b\n", addr->tmfsr, FSR_BITS);
692: }
693: #endif AVIV
694: bp->b_flags |= B_ERROR;
695: goto opdone;
696: }
697: /*
698: * Advance tape control FSM.
699: */
700: ignoreerr:
701: switch (state) {
702:
703: case SIO:
704: /*
705: * Read/write increments tape block number
706: */
707: sc->sc_blkno++;
708: sc->sc_blks++;
709: if (um->um_tab.b_errcnt)
710: sc->sc_softerrs++;
711: goto opdone;
712:
713: case SCOM:
714: /*
715: * For forward/backward space record update current position.
716: */
717: if (bp == &ctmbuf[TMUNIT(bp->b_dev)])
718: switch ((int)bp->b_command) {
719:
720: case TM_SFORW:
721: sc->sc_blkno -= bp->b_repcnt;
722: break;
723:
724: case TM_SREV:
725: sc->sc_blkno += bp->b_repcnt;
726: break;
727: }
728: goto opdone;
729:
730: case SSEEK:
731: sc->sc_blkno = bdbtofsb(bp->b_blkno);
732: goto opcont;
733:
734: default:
735: panic("tmintr");
736: }
737: opdone:
738: /*
739: * Reset error count and remove
740: * from device queue.
741: */
742: um->um_tab.b_errcnt = 0;
743: dp->b_actf = bp->av_forw;
744: /*
745: * Check resid; watch out for resid >32767 (tmbc not negative).
746: */
747: bp->b_resid = ((int) -addr->tmbc) & 0xffff;
748: ubadone(um);
749: iodone(bp);
750: /*
751: * Circulate slave to end of controller
752: * queue to give other slaves a chance.
753: */
754: um->um_tab.b_actf = dp->b_forw;
755: if (dp->b_actf) {
756: dp->b_forw = NULL;
757: if (um->um_tab.b_actf == NULL)
758: um->um_tab.b_actf = dp;
759: else
760: um->um_tab.b_actl->b_forw = dp;
761: um->um_tab.b_actl = dp;
762: }
763: if (um->um_tab.b_actf == 0)
764: return;
765: opcont:
766: tmstart(um);
767: }
768:
769: tmtimer(dev)
770: int dev;
771: {
772: register struct te_softc *sc = &te_softc[TEUNIT(dev)];
773: register short x;
774:
775: if (sc->sc_timo != INF && (sc->sc_timo -= 5) < 0) {
776: printf("te%d: lost interrupt\n", TEUNIT(dev));
777: sc->sc_timo = INF;
778: x = spl5();
779: tmintr(TMUNIT(dev));
780: (void) splx(x);
781: }
782: timeout(tmtimer, (caddr_t)dev, 5*hz);
783: }
784:
785: tmseteof(bp)
786: register struct buf *bp;
787: {
788: register int teunit = TEUNIT(bp->b_dev);
789: register struct tmdevice *addr =
790: (struct tmdevice *)tedinfo[teunit]->ui_addr;
791: register struct te_softc *sc = &te_softc[teunit];
792:
793: if (bp == &ctmbuf[TMUNIT(bp->b_dev)]) {
794: if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) {
795: /* reversing */
796: sc->sc_nxrec = bdbtofsb(bp->b_blkno) - addr->tmbc;
797: sc->sc_blkno = sc->sc_nxrec;
798: } else {
799: /* spacing forward */
800: sc->sc_blkno = bdbtofsb(bp->b_blkno) + addr->tmbc;
801: sc->sc_nxrec = sc->sc_blkno - 1;
802: }
803: return;
804: }
805: /* eof on read */
806: sc->sc_nxrec = bdbtofsb(bp->b_blkno);
807: }
808:
809: tmreset(uban)
810: int uban;
811: {
812: register struct uba_ctlr *um;
813: register tm11, teunit;
814: register struct uba_device *ui;
815: register struct buf *dp;
816:
817: for (tm11 = 0; tm11 < NTM; tm11++) {
818: if ((um = tmminfo[tm11]) == 0 || um->um_alive == 0 ||
819: um->um_ubanum != uban)
820: continue;
821: printf(" tm%d", tm11);
822: um->um_tab.b_active = 0;
823: um->um_tab.b_actf = um->um_tab.b_actl = 0;
824: if (um->um_ubinfo) {
825: printf("<%d>", (um->um_ubinfo>>28)&0xf);
826: um->um_ubinfo = 0;
827: }
828: ((struct tmdevice *)(um->um_addr))->tmcs = TM_DCLR;
829: for (teunit = 0; teunit < NTE; teunit++) {
830: if ((ui = tedinfo[teunit]) == 0 || ui->ui_mi != um ||
831: ui->ui_alive == 0)
832: continue;
833: dp = &teutab[teunit];
834: dp->b_active = 0;
835: dp->b_forw = 0;
836: if (um->um_tab.b_actf == NULL)
837: um->um_tab.b_actf = dp;
838: else
839: um->um_tab.b_actl->b_forw = dp;
840: um->um_tab.b_actl = dp;
841: if (te_softc[teunit].sc_openf > 0)
842: te_softc[teunit].sc_openf = -1;
843: }
844: tmstart(um);
845: }
846: }
847:
848: /*ARGSUSED*/
849: tmioctl(dev, cmd, data, flag)
850: caddr_t data;
851: dev_t dev;
852: {
853: int teunit = TEUNIT(dev);
854: register struct te_softc *sc = &te_softc[teunit];
855: register struct buf *bp = &ctmbuf[TMUNIT(dev)];
856: register callcount;
857: int fcount;
858: struct mtop *mtop;
859: struct mtget *mtget;
860: /* we depend of the values and order of the MT codes here */
861: static tmops[] =
862: {TM_WEOF,TM_SFORW,TM_SREV,TM_SFORW,TM_SREV,TM_REW,TM_OFFL,TM_SENSE};
863:
864: switch (cmd) {
865:
866: case MTIOCTOP: /* tape operation */
867: mtop = (struct mtop *)data;
868: switch (mtop->mt_op) {
869:
870: case MTWEOF:
871: callcount = mtop->mt_count;
872: fcount = 1;
873: break;
874:
875: case MTFSF: case MTBSF:
876: callcount = mtop->mt_count;
877: fcount = INF;
878: break;
879:
880: case MTFSR: case MTBSR:
881: callcount = 1;
882: fcount = mtop->mt_count;
883: break;
884:
885: case MTREW: case MTOFFL: case MTNOP:
886: callcount = 1;
887: fcount = 1;
888: break;
889:
890: default:
891: return (ENXIO);
892: }
893: if (callcount <= 0 || fcount <= 0)
894: return (EINVAL);
895: while (--callcount >= 0) {
896: tmcommand(dev, tmops[mtop->mt_op], fcount);
897: if ((mtop->mt_op == MTFSR || mtop->mt_op == MTBSR) &&
898: bp->b_resid)
899: return (EIO);
900: if ((bp->b_flags&B_ERROR) || sc->sc_erreg&TMER_BOT)
901: break;
902: }
903: return (geterror(bp));
904:
905: case MTIOCGET:
906: mtget = (struct mtget *)data;
907: mtget->mt_dsreg = sc->sc_dsreg;
908: mtget->mt_erreg = sc->sc_erreg;
909: mtget->mt_resid = sc->sc_resid;
910: mtget->mt_type = MT_ISTM;
911: break;
912:
913: default:
914: return (ENXIO);
915: }
916: return (0);
917: }
918:
919: #define DBSIZE 20
920:
921: tmdump()
922: {
923: register struct uba_device *ui;
924: register struct uba_regs *up;
925: register struct tmdevice *addr;
926: int blk, num;
927: int start;
928:
929: start = 0;
930: num = maxfree;
931: #define phys(a,b) ((b)((int)(a)&0x7fffffff))
932: if (tedinfo[0] == 0)
933: return (ENXIO);
934: ui = phys(tedinfo[0], struct uba_device *);
935: up = phys(ui->ui_hd, struct uba_hd *)->uh_physuba;
936: ubainit(up);
937: DELAY(1000000);
938: addr = (struct tmdevice *)ui->ui_physaddr;
939: tmwait(addr);
940: addr->tmcs = TM_DCLR | TM_GO;
941: while (num > 0) {
942: blk = num > DBSIZE ? DBSIZE : num;
943: tmdwrite(start, blk, addr, up);
944: start += blk;
945: num -= blk;
946: }
947: tmeof(addr);
948: tmeof(addr);
949: tmwait(addr);
950: if (addr->tmcs&TM_ERR)
951: return (EIO);
952: addr->tmcs = TM_REW | TM_GO;
953: tmwait(addr);
954: return (0);
955: }
956:
957: tmdwrite(dbuf, num, addr, up)
958: register dbuf, num;
959: register struct tmdevice *addr;
960: struct uba_regs *up;
961: {
962: register struct pte *io;
963: register int npf;
964:
965: tmwait(addr);
966: io = up->uba_map;
967: npf = num+1;
968: while (--npf != 0)
969: *(int *)io++ = (dbuf++ | (1<<UBAMR_DPSHIFT) | UBAMR_MRV);
970: *(int *)io = 0;
971: addr->tmbc = -(num*NBPG);
972: addr->tmba = 0;
973: addr->tmcs = TM_WCOM | TM_GO;
974: }
975:
976: tmwait(addr)
977: register struct tmdevice *addr;
978: {
979: register s;
980:
981: do
982: s = addr->tmcs;
983: while ((s & TM_CUR) == 0);
984: }
985:
986: tmeof(addr)
987: struct tmdevice *addr;
988: {
989:
990: tmwait(addr);
991: addr->tmcs = TM_WEOF | TM_GO;
992: }
993: #endif
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