/* mt.c 4.15 82/12/17 */ #include "mu.h" #if NMT > 0 /* * TM78/TU78 tape driver * * Behavior in complex error situations is uncertain... * * TODO: * test error recovery * add odd byte count kludge from VMS driver * write dump routine */ #include "../machine/pte.h" #include "../h/param.h" #include "../h/systm.h" #include "../h/buf.h" #include "../h/conf.h" #include "../h/dir.h" #include "../h/file.h" #include "../h/user.h" #include "../h/map.h" #include "../h/ioctl.h" #include "../h/mtio.h" #include "../h/cmap.h" #include "../h/uio.h" #include "../vax/cpu.h" #include "../vaxmba/mbareg.h" #include "../vaxmba/mbavar.h" #include "../vaxmba/mtreg.h" struct buf rmtbuf[NMT]; struct buf cmtbuf[NMT]; short mttypes[] = { MBDT_TU78, 0 }; struct mba_device *mtinfo[NMT]; int mtattach(), mtslave(), mtustart(), mtstart(), mtndtint(), mtdtint(); struct mba_driver mtdriver = { mtattach, mtslave, mtustart, mtstart, mtdtint, mtndtint, mttypes, "mt", "mu", mtinfo }; #define MASKREG(r) ((r) & 0xffff) /* bits in minor device */ #define MUUNIT(dev) (minor(dev)&03) #define H_NOREWIND 04 #define H_6250BPI 08 #define MTUNIT(dev) (mutomt[MUUNIT(dev)]) #define INF (daddr_t)1000000L /* a block number that wont exist */ struct mu_softc { char sc_openf; char sc_flags; daddr_t sc_blkno; daddr_t sc_nxrec; u_short sc_erreg; u_short sc_dsreg; short sc_resid; short sc_dens; struct mba_device *sc_mi; int sc_slave; } mu_softc[NMU]; short mutomt[NMU]; /* * Bits for sc_flags. */ #define H_WRITTEN 1 /* last operation was a write */ char mtds_bits[] = MTDS_BITS; /*ARGSUSED*/ mtattach(mi) struct mba_device *mi; { } mtslave(mi, ms, sn) struct mba_device *mi; struct mba_slave *ms; int sn; { register struct mu_softc *sc = &mu_softc[ms->ms_unit]; register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv; int s = spl7(), rtn = 0; mtaddr->mtas = -1; mtaddr->mtncs[sn] = MT_SENSE|MT_GO; while (mtaddr->mtas == 0) ; if ((mtaddr->mtner & MTER_INTCODE) == MTER_DONE && (mtaddr->mtds & MTDS_PRES)) { sc->sc_mi = mi; sc->sc_slave = sn; mutomt[ms->ms_unit] = mi->mi_unit; rtn = 1; } mtaddr->mtas = mtaddr->mtas; splx(s); return (rtn); } mtopen(dev, flag) dev_t dev; int flag; { register int muunit; register struct mba_device *mi; register struct mu_softc *sc; int olddens, dens; muunit = MUUNIT(dev); if (muunit >= NMU || (sc = &mu_softc[muunit])->sc_openf || (mi = mtinfo[MTUNIT(dev)]) == 0 || mi->mi_alive == 0) return (ENXIO); olddens = sc->sc_dens; dens = sc->sc_dens = (minor(dev)&H_6250BPI) ? MT_GCR : 0; mtcommand(dev, MT_SENSE, 1); sc->sc_dens = olddens; if ((sc->sc_dsreg & MTDS_ONL) == 0) { uprintf("mu%d: not online\n", muunit); return (EIO); } if ((flag&FWRITE) && (sc->sc_dsreg&MTDS_FPT)) { uprintf("mu%d: no write ring\n", muunit); return (EIO); } if ((sc->sc_dsreg & MTDS_BOT) == 0 && (flag&FWRITE) && dens != sc->sc_dens) { uprintf("mu%d: can't change density in mid-tape\n", muunit); return (EIO); } sc->sc_openf = 1; sc->sc_blkno = (daddr_t)0; sc->sc_nxrec = INF; sc->sc_flags = 0; sc->sc_dens = dens; return (0); } mtclose(dev, flag) register dev_t dev; register flag; { register struct mu_softc *sc = &mu_softc[MUUNIT(dev)]; if (flag == FWRITE || ((flag&FWRITE) && (sc->sc_flags&H_WRITTEN))) mtcommand(dev, MT_CLS|sc->sc_dens, 1); if ((minor(dev)&H_NOREWIND) == 0) mtcommand(dev, MT_REW, 0); sc->sc_openf = 0; } mtcommand(dev, com, count) dev_t dev; int com, count; { register struct buf *bp; register int s; bp = &cmtbuf[MTUNIT(dev)]; s = spl5(); while (bp->b_flags&B_BUSY) { if(bp->b_repcnt == 0 && (bp->b_flags&B_DONE)) break; bp->b_flags |= B_WANTED; sleep((caddr_t)bp, PRIBIO); } bp->b_flags = B_BUSY|B_READ; splx(s); bp->b_dev = dev; bp->b_command = com; bp->b_repcnt = count; bp->b_blkno = 0; mtstrategy(bp); if (count == 0) return; iowait(bp); if (bp->b_flags&B_WANTED) wakeup((caddr_t)bp); bp->b_flags &= B_ERROR; } mtstrategy(bp) register struct buf *bp; { register struct mba_device *mi = mtinfo[MTUNIT(bp->b_dev)]; register struct buf *dp; register int s; bp->av_forw = NULL; dp = &mi->mi_tab; s = spl5(); if (dp->b_actf == NULL) dp->b_actf = bp; else dp->b_actl->av_forw = bp; dp->b_actl = bp; if (dp->b_active == 0) mbustart(mi); splx(s); } mtustart(mi) register struct mba_device *mi; { register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv; register struct buf *bp = mi->mi_tab.b_actf; register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)]; daddr_t blkno; sc->sc_flags &= ~H_WRITTEN; if (sc->sc_openf < 0) { bp->b_flags |= B_ERROR; return (MBU_NEXT); } if (bp != &cmtbuf[MTUNIT(bp->b_dev)]) { if (bdbtofsb(bp->b_blkno) > sc->sc_nxrec) { bp->b_flags |= B_ERROR; bp->b_error = ENXIO; return (MBU_NEXT); } if (bdbtofsb(bp->b_blkno) == sc->sc_nxrec && bp->b_flags&B_READ) { bp->b_resid = bp->b_bcount; clrbuf(bp); return (MBU_NEXT); } if ((bp->b_flags&B_READ)==0) sc->sc_nxrec = bdbtofsb(bp->b_blkno) + 1; } else { mtaddr->mtncs[MUUNIT(bp->b_dev)] = (bp->b_repcnt<<8)|bp->b_command|MT_GO; return (MBU_STARTED); } if ((blkno = sc->sc_blkno) == bdbtofsb(bp->b_blkno)) { if (mi->mi_tab.b_errcnt == 2) { mtaddr->mtca = MUUNIT(bp->b_dev); } else { mtaddr->mtbc = bp->b_bcount; mtaddr->mtca = (1<<2)|MUUNIT(bp->b_dev); } return (MBU_DODATA); } if (blkno < bdbtofsb(bp->b_blkno)) mtaddr->mtncs[MUUNIT(bp->b_dev)] = (min((unsigned)(bdbtofsb(bp->b_blkno) - blkno), 0377) << 8) | MT_SFORW|MT_GO; else mtaddr->mtncs[MUUNIT(bp->b_dev)] = (min((unsigned)(blkno - bdbtofsb(bp->b_blkno)), 0377) << 8) | MT_SREV|MT_GO; return (MBU_STARTED); } mtstart(mi) register struct mba_device *mi; { register struct buf *bp = mi->mi_tab.b_actf; register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)]; if (bp->b_flags & B_READ) if (mi->mi_tab.b_errcnt == 2) return(MT_READREV|MT_GO); else return(MT_READ|MT_GO); else return(MT_WRITE|sc->sc_dens|MT_GO); } mtdtint(mi, mbsr) register struct mba_device *mi; int mbsr; { register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv; register struct buf *bp = mi->mi_tab.b_actf; register struct mu_softc *sc; /* I'M NOT SURE IF THIS SHOULD ALWAYS BE THE CASE SO FOR NOW... */ if ((mtaddr->mtca&3) != MUUNIT(bp->b_dev)) { printf("mt: wrong unit!\n"); mtaddr->mtca = MUUNIT(bp->b_dev); } sc = &mu_softc[MUUNIT(bp->b_dev)]; sc->sc_erreg = mtaddr->mter; if((bp->b_flags & B_READ) == 0) sc->sc_flags |= H_WRITTEN; switch (sc->sc_erreg & MTER_INTCODE) { case MTER_DONE: case MTER_LONGREC: if (mi->mi_tab.b_errcnt != 2) sc->sc_blkno++; bp->b_resid = 0; break; case MTER_NOTCAP: printf("mu%d: blank tape\n", MUUNIT(bp->b_dev)); goto err; case MTER_TM: case MTER_EOT: sc->sc_blkno++; err: bp->b_resid = bp->b_bcount; sc->sc_nxrec = bdbtofsb(bp->b_blkno); break; case MTER_SHRTREC: sc->sc_blkno++; if (bp != &rmtbuf[MTUNIT(bp->b_dev)]) bp->b_flags |= B_ERROR; if (mi->mi_tab.b_errcnt == 2) bp->b_bcount = bp->b_resid; /* restore saved value */ bp->b_resid = bp->b_bcount - mtaddr->mtbc; break; case MTER_RDOPP: mi->mi_tab.b_errcnt = 2; /* indicate "read opposite" */ bp->b_resid = bp->b_bcount; /* save it */ bp->b_bcount = mtaddr->mtbc; /* use this instead */ return(MBD_RETRY); case MTER_RETRY: mi->mi_tab.b_errcnt = 1; /* indicate simple retry */ return(MBD_RETRY); case MTER_OFFLINE: if (sc->sc_openf > 0) { sc->sc_openf = -1; printf("mu%d: offline\n", MUUNIT(bp->b_dev)); } bp->b_flags |= B_ERROR; break; case MTER_FPT: printf("mu%d: no write ring\n", MUUNIT(bp->b_dev)); bp->b_flags |= B_ERROR; break; default: printf("mu%d: hard error bn%d mbsr=%b er=%x ds=%b\n", MUUNIT(bp->b_dev), bp->b_blkno, mbsr, mbsr_bits, sc->sc_erreg, sc->sc_dsreg, mtds_bits); bp->b_flags |= B_ERROR; mtaddr->mtid = MTID_CLR; /* reset the TM78 */ DELAY(250); while ((mtaddr->mtid & MTID_RDY) == 0) /* wait for it */ ; return (MBD_DONE); } /* CHECK FOR MBA ERROR WHEN NO OTHER ERROR INDICATED? */ return (MBD_DONE); } mtndtint(mi) register struct mba_device *mi; { register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv; register struct buf *bp = mi->mi_tab.b_actf; register struct mu_softc *sc; int er, fc, unit; unit = (mtaddr->mtner >> 8) & 3; er = MASKREG(mtaddr->mtner); /* WILL THIS OCCUR IF ANOTHER DRIVE COMES ONLINE? */ if (bp == 0 || unit != MUUNIT(bp->b_dev)) { /* consistency check */ if ((er & MTER_INTCODE) != MTER_ONLINE) printf("mt: unit %d random interrupt\n", unit); return (MBN_SKIP); } if (bp == 0) return (MBN_SKIP); fc = (mtaddr->mtncs[unit] >> 8) & 0xff; sc = &mu_softc[unit]; sc->sc_erreg = er; sc->sc_resid = fc; switch (er & MTER_INTCODE) { case MTER_DONE: if (bp == &cmtbuf[MTUNIT(bp->b_dev)]) { done: if (bp->b_command == MT_SENSE) sc->sc_dsreg = MASKREG(mtaddr->mtds); bp->b_resid = fc; return (MBN_DONE); } /* this is UGLY! (but is it correct?) */ if ((fc = bdbtofsb(bp->b_blkno) - sc->sc_blkno) < 0) sc->sc_blkno -= MIN(0377, -fc); else sc->sc_blkno += MIN(0377, fc); return (MBN_RETRY); case MTER_RWDING: return (MBN_SKIP); /* ignore "rewind started" interrupt */ case MTER_NOTCAP: printf("mu%d: blank tape\n", MUUNIT(bp->b_dev)); case MTER_TM: case MTER_EOT: case MTER_LEOT: if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) { sc->sc_nxrec = bdbtofsb(bp->b_blkno) + fc; sc->sc_blkno = sc->sc_nxrec; } else { sc->sc_blkno = bdbtofsb(bp->b_blkno) - fc; sc->sc_nxrec = sc->sc_blkno - 1; } return (MBN_RETRY); case MTER_FPT: printf("mu%d: no write ring\n", MUUNIT(bp->b_dev)); bp->b_flags |= B_ERROR; return (MBN_DONE); case MTER_OFFLINE: if (sc->sc_openf > 0) { sc->sc_openf = -1; printf("mu%d: offline\n", MUUNIT(bp->b_dev)); } bp->b_flags |= B_ERROR; return (MBN_DONE); case MTER_BOT: if (bp == &cmtbuf[MTUNIT(bp->b_dev)]) goto done; /* FALL THROUGH */ default: printf("mu%d: hard error bn%d er=%o ds=%b\n", MUUNIT(bp->b_dev), bp->b_blkno, sc->sc_erreg, sc->sc_dsreg, mtds_bits); mtaddr->mtid = MTID_CLR; /* reset the TM78 */ DELAY(250); while ((mtaddr->mtid & MTID_RDY) == 0) /* wait for it */ ; bp->b_flags |= B_ERROR; return (MBN_DONE); } /* NOTREACHED */ } mtread(dev, uio) dev_t dev; struct uio *uio; { int errno; errno = mtphys(dev, uio); if (errno) return (errno); return (physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_READ, minphys, uio)); } mtwrite(dev, uio) dev_t dev; struct uio *uio; { int errno; errno = mtphys(dev, uio); if (errno) return (errno); return (physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_WRITE, minphys, uio)); } mtphys(dev, uio) dev_t dev; struct uio *uio; { register int mtunit; register struct mu_softc *sc; register struct mba_device *mi; daddr_t a; mtunit = MTUNIT(dev); if (mtunit >= NMT || (mi = mtinfo[mtunit]) == 0 || mi->mi_alive == 0) return (ENXIO); a = uio->uio_offset >> 9; sc = &mu_softc[MUUNIT(dev)]; sc->sc_blkno = bdbtofsb(a); sc->sc_nxrec = bdbtofsb(a)+1; return (0); } /*ARGSUSED*/ mtioctl(dev, cmd, data, flag) dev_t dev; int cmd; caddr_t data; int flag; { register struct mu_softc *sc = &mu_softc[MUUNIT(dev)]; register struct buf *bp = &cmtbuf[MTUNIT(dev)]; register callcount; register int op; int fcount; struct mtop *mtop; struct mtget *mtget; /* we depend of the values and order of the MT codes here */ static mtops[] = {MT_WTM,MT_SFORWF,MT_SREVF,MT_SFORW,MT_SREV,MT_REW,MT_UNLOAD,MT_SENSE}; switch (cmd) { case MTIOCTOP: /* tape operation */ mtop = (struct mtop *)data; switch (mtop->mt_op) { case MTWEOF: callcount = mtop->mt_count; fcount = 1; break; case MTFSF: case MTBSF: callcount = mtop->mt_count; fcount = 1; break; case MTFSR: case MTBSR: callcount = 1; fcount = mtop->mt_count; break; case MTREW: case MTOFFL: callcount = 1; fcount = 1; break; default: return (ENXIO); } if (callcount <= 0 || fcount <= 0) return (EINVAL); op = mtops[mtop->mt_op]; if (op == MT_WTM) op |= sc->sc_dens; while (--callcount >= 0) { register int n; do { n = MIN(fcount, 0xff); mtcommand(dev, op, n); fcount -= n; } while (fcount); if ((mtop->mt_op == MTFSR || mtop->mt_op == MTBSR) && bp->b_resid) return (EIO); if (bp->b_flags&B_ERROR) break; } return (geterror(bp)); case MTIOCGET: mtget = (struct mtget *)data; mtget->mt_erreg = sc->sc_erreg; mtget->mt_resid = sc->sc_resid; mtcommand(dev, MT_SENSE, 1); /* update drive status */ mtget->mt_dsreg = sc->sc_dsreg; mtget->mt_type = MT_ISMT; break; default: return (ENXIO); } return (0); } #define DBSIZE 20 mtdump() { register struct mba_device *mi; register struct mba_regs *mp; int blk, num; int start; start = 0; num = maxfree; #define phys(a,b) ((b)((int)(a)&0x7fffffff)) if (mtinfo[0] == 0) return (ENXIO); mi = phys(mtinfo[0], struct mba_device *); mp = phys(mi->mi_hd, struct mba_hd *)->mh_physmba; mp->mba_cr = MBCR_IE; #if lint blk = 0; num = blk; start = num; blk = start; return (0); #endif #ifdef notyet mtaddr = (struct mtdevice *)&mp->mba_drv[mi->mi_drive]; mtaddr->mttc = MTTC_PDP11|MTTC_1600BPI; mtaddr->mtcs1 = MT_DCLR|MT_GO; while (num > 0) { blk = num > DBSIZE ? DBSIZE : num; mtdwrite(start, blk, mtaddr, mp); start += blk; num -= blk; } mteof(mtaddr); mteof(mtaddr); mtwait(mtaddr); if (mtaddr->mtds&MTDS_ERR) return (EIO); mtaddr->mtcs1 = MT_REW|MT_GO; return (0); } mtdwrite(dbuf, num, mtaddr, mp) register dbuf, num; register struct mtdevice *mtaddr; struct mba_regs *mp; { register struct pte *io; register int i; mtwait(mtaddr); io = mp->mba_map; for (i = 0; i < num; i++) *(int *)io++ = dbuf++ | PG_V; mtaddr->mtfc = -(num*NBPG); mp->mba_sr = -1; mp->mba_bcr = -(num*NBPG); mp->mba_var = 0; mtaddr->mtcs1 = MT_WCOM|MT_GO; } mtwait(mtaddr) struct mtdevice *mtaddr; { register s; do s = mtaddr->mtds; while ((s & MTDS_DRY) == 0); } mteof(mtaddr) struct mtdevice *mtaddr; { mtwait(mtaddr); mtaddr->mtcs1 = MT_WEOF|MT_GO; #endif notyet } #endif