rd.c

早期freebsd实现

	register int unit;
{
	register struct buf *bp;
	register struct rd_softc *rs = &rd_softc[unit];

	bp = rdtab[unit].b_actf;
	rs->sc_addr = bp->b_un.b_addr;
	rs->sc_resid = bp->b_bcount;
	if (hpibreq(&rs->sc_dq))
		rdstart(unit);
}

struct buf *
rdfinish(unit, rs, bp)
	int unit;
	register struct rd_softc *rs;
	register struct buf *bp;
{
	register struct buf *dp = &rdtab[unit];

	dp->b_errcnt = 0;
	dp->b_actf = bp->b_actf;
	bp->b_resid = 0;
	biodone(bp);
	hpibfree(&rs->sc_dq);
	if (dp->b_actf)
		return(dp->b_actf);
	dp->b_active = 0;
	if (rs->sc_flags & RDF_WANTED) {
		rs->sc_flags &= ~RDF_WANTED;
		wakeup((caddr_t)dp);
	}
	return(NULL);
}

rdstart(unit)
	register int unit;
{
	register struct rd_softc *rs = &rd_softc[unit];
	register struct buf *bp = rdtab[unit].b_actf;
	register struct hp_device *hp = rs->sc_hd;
	register int part;

again:
#ifdef DEBUG
	if (rddebug & RDB_FOLLOW)
		printf("rdstart(%d): bp %x, %c\n", unit, bp,
		       (bp->b_flags & B_READ) ? 'R' : 'W');
#endif
	part = rdpart(bp->b_dev);
	rs->sc_flags |= RDF_SEEK;
	rs->sc_ioc.c_unit = C_SUNIT(rs->sc_punit);
	rs->sc_ioc.c_volume = C_SVOL(0);
	rs->sc_ioc.c_saddr = C_SADDR;
	rs->sc_ioc.c_hiaddr = 0;
	rs->sc_ioc.c_addr = RDBTOS(bp->b_cylin);
	rs->sc_ioc.c_nop2 = C_NOP;
	rs->sc_ioc.c_slen = C_SLEN;
	rs->sc_ioc.c_len = rs->sc_resid;
	rs->sc_ioc.c_cmd = bp->b_flags & B_READ ? C_READ : C_WRITE;
#ifdef DEBUG
	if (rddebug & RDB_IO)
		printf("rdstart: hpibsend(%x, %x, %x, %x, %x)\n",
		       hp->hp_ctlr, hp->hp_slave, C_CMD,
		       &rs->sc_ioc.c_unit, sizeof(rs->sc_ioc)-2);
#endif
	if (hpibsend(hp->hp_ctlr, hp->hp_slave, C_CMD, &rs->sc_ioc.c_unit,
		     sizeof(rs->sc_ioc)-2) == sizeof(rs->sc_ioc)-2) {
		if (hp->hp_dk >= 0) {
			dk_busy |= 1 << hp->hp_dk;
			dk_seek[hp->hp_dk]++;
		}
#ifdef DEBUG
		if (rddebug & RDB_IO)
			printf("rdstart: hpibawait(%x)\n", hp->hp_ctlr);
#endif
		hpibawait(hp->hp_ctlr);
		return;
	}
	/*
	 * Experience has shown that the hpibwait in this hpibsend will
	 * occasionally timeout.  It appears to occur mostly on old 7914
	 * drives with full maintenance tracks.  We should probably
	 * integrate this with the backoff code in rderror.
	 */
#ifdef DEBUG
	if (rddebug & RDB_ERROR)
		printf("rd%d: rdstart: cmd %x adr %d blk %d len %d ecnt %d\n",
		       unit, rs->sc_ioc.c_cmd, rs->sc_ioc.c_addr,
		       bp->b_blkno, rs->sc_resid, rdtab[unit].b_errcnt);
	rdstats[unit].rdretries++;
#endif
	rs->sc_flags &= ~RDF_SEEK;
	rdreset(rs, hp);
	if (rdtab[unit].b_errcnt++ < RDRETRY)
		goto again;
	printf("rd%d: rdstart err: cmd 0x%x sect %d blk %d len %d\n",
	       unit, rs->sc_ioc.c_cmd, rs->sc_ioc.c_addr,
	       bp->b_blkno, rs->sc_resid);
	bp->b_flags |= B_ERROR;
	bp->b_error = EIO;
	bp = rdfinish(unit, rs, bp);
	if (bp) {
		rs->sc_addr = bp->b_un.b_addr;
		rs->sc_resid = bp->b_bcount;
		if (hpibreq(&rs->sc_dq))
			goto again;
	}
}

rdgo(unit)
	register int unit;
{
	register struct rd_softc *rs = &rd_softc[unit];
	register struct hp_device *hp = rs->sc_hd;
	struct buf *bp = rdtab[unit].b_actf;

	if (hp->hp_dk >= 0) {
		dk_busy |= 1 << hp->hp_dk;
		dk_xfer[hp->hp_dk]++;
		dk_wds[hp->hp_dk] += rs->sc_resid >> 6;
	}
#ifdef USELEDS
	if (inledcontrol == 0)
		ledcontrol(0, 0, LED_DISK);
#endif
	hpibgo(hp->hp_ctlr, hp->hp_slave, C_EXEC,
	       rs->sc_addr, rs->sc_resid, bp->b_flags & B_READ);
}

rdintr(unit)
	register int unit;
{
	register struct rd_softc *rs = &rd_softc[unit];
	register struct buf *bp = rdtab[unit].b_actf;
	register struct hp_device *hp = rs->sc_hd;
	u_char stat = 13;	/* in case hpibrecv fails */
	int rv, restart;
	
#ifdef DEBUG
	if (rddebug & RDB_FOLLOW)
		printf("rdintr(%d): bp %x, %c, flags %x\n", unit, bp,
		       (bp->b_flags & B_READ) ? 'R' : 'W', rs->sc_flags);
	if (bp == NULL) {
		printf("rd%d: bp == NULL\n", unit);
		return;
	}
#endif
	if (hp->hp_dk >= 0)
		dk_busy &= ~(1 << hp->hp_dk);
	if (rs->sc_flags & RDF_SEEK) {
		rs->sc_flags &= ~RDF_SEEK;
		if (hpibustart(hp->hp_ctlr))
			rdgo(unit);
		return;
	}
	if ((rs->sc_flags & RDF_SWAIT) == 0) {
#ifdef DEBUG
		rdstats[unit].rdpolltries++;
#endif
		if (hpibpptest(hp->hp_ctlr, hp->hp_slave) == 0) {
#ifdef DEBUG
			rdstats[unit].rdpollwaits++;
#endif
			if (hp->hp_dk >= 0)
				dk_busy |= 1 << hp->hp_dk;
			rs->sc_flags |= RDF_SWAIT;
			hpibawait(hp->hp_ctlr);
			return;
		}
	} else
		rs->sc_flags &= ~RDF_SWAIT;
	rv = hpibrecv(hp->hp_ctlr, hp->hp_slave, C_QSTAT, &stat, 1);
	if (rv != 1 || stat) {
#ifdef DEBUG
		if (rddebug & RDB_ERROR)
			printf("rdintr: recv failed or bad stat %d\n", stat);
#endif
		restart = rderror(unit);
#ifdef DEBUG
		rdstats[unit].rdretries++;
#endif
		if (rdtab[unit].b_errcnt++ < RDRETRY) {
			if (restart)
				rdstart(unit);
			return;
		}
		bp->b_flags |= B_ERROR;
		bp->b_error = EIO;
	}
	if (rdfinish(unit, rs, bp))
		rdustart(unit);
}

rdstatus(rs)
	register struct rd_softc *rs;
{
	register int c, s;
	u_char stat;
	int rv;

	c = rs->sc_hd->hp_ctlr;
	s = rs->sc_hd->hp_slave;
	rs->sc_rsc.c_unit = C_SUNIT(rs->sc_punit);
	rs->sc_rsc.c_sram = C_SRAM;
	rs->sc_rsc.c_ram = C_RAM;
	rs->sc_rsc.c_cmd = C_STATUS;
	bzero((caddr_t)&rs->sc_stat, sizeof(rs->sc_stat));
	rv = hpibsend(c, s, C_CMD, &rs->sc_rsc, sizeof(rs->sc_rsc));
	if (rv != sizeof(rs->sc_rsc)) {
#ifdef DEBUG
		if (rddebug & RDB_STATUS)
			printf("rdstatus: send C_CMD failed %d != %d\n",
			       rv, sizeof(rs->sc_rsc));
#endif
		return(1);
	}
	rv = hpibrecv(c, s, C_EXEC, &rs->sc_stat, sizeof(rs->sc_stat));
	if (rv != sizeof(rs->sc_stat)) {
#ifdef DEBUG
		if (rddebug & RDB_STATUS)
			printf("rdstatus: send C_EXEC failed %d != %d\n",
			       rv, sizeof(rs->sc_stat));
#endif
		return(1);
	}
	rv = hpibrecv(c, s, C_QSTAT, &stat, 1);
	if (rv != 1 || stat) {
#ifdef DEBUG
		if (rddebug & RDB_STATUS)
			printf("rdstatus: recv failed %d or bad stat %d\n",
			       rv, stat);
#endif
		return(1);
	}
	return(0);
}

/*
 * Deal with errors.
 * Returns 1 if request should be restarted,
 * 0 if we should just quietly give up.
 */
rderror(unit)
	int unit;
{
	struct rd_softc *rs = &rd_softc[unit];
	register struct rd_stat *sp;
	struct buf *bp;
	daddr_t hwbn, pbn;

	if (rdstatus(rs)) {
#ifdef DEBUG
		printf("rd%d: couldn't get status\n", unit);
#endif
		rdreset(rs, rs->sc_hd);
		return(1);
	}
	sp = &rs->sc_stat;
	if (sp->c_fef & FEF_REXMT)
		return(1);
	if (sp->c_fef & FEF_PF) {
		rdreset(rs, rs->sc_hd);
		return(1);
	}
	/*
	 * Unit requests release for internal maintenance.
	 * We just delay awhile and try again later.  Use expontially
	 * increasing backoff ala ethernet drivers since we don't really
	 * know how long the maintenance will take.  With RDWAITC and
	 * RDRETRY as defined, the range is 1 to 32 seconds.
	 */
	if (sp->c_fef & FEF_IMR) {
		extern int hz;
		int rdtimo = RDWAITC << rdtab[unit].b_errcnt;
#ifdef DEBUG
		printf("rd%d: internal maintenance, %d second timeout\n",
		       unit, rdtimo);
		rdstats[unit].rdtimeouts++;
#endif
		hpibfree(&rs->sc_dq);
		timeout(rdrestart, (void *)unit, rdtimo * hz);
		return(0);
	}
	/*
	 * Only report error if we have reached the error reporting
	 * threshhold.  By default, this will only report after the
	 * retry limit has been exceeded.
	 */
	if (rdtab[unit].b_errcnt < rderrthresh)
		return(1);

	/*
	 * First conjure up the block number at which the error occured.
	 * Note that not all errors report a block number, in that case
	 * we just use b_blkno.
 	 */
	bp = rdtab[unit].b_actf;
	pbn = rs->sc_info.ri_label.d_partitions[rdpart(bp->b_dev)].p_offset;
	if ((sp->c_fef & FEF_CU) || (sp->c_fef & FEF_DR) ||
	    (sp->c_ief & IEF_RRMASK)) {
		hwbn = RDBTOS(pbn + bp->b_blkno);
		pbn = bp->b_blkno;
	} else {
		hwbn = sp->c_blk;
		pbn = RDSTOB(hwbn) - pbn;
	}
	/*
	 * Now output a generic message suitable for badsect.
	 * Note that we don't use harderr cuz it just prints
	 * out b_blkno which is just the beginning block number
	 * of the transfer, not necessary where the error occured.
	 */
	printf("rd%d%c: hard error sn%d\n",
	       rdunit(bp->b_dev), 'a'+rdpart(bp->b_dev), pbn);
	/*
	 * Now report the status as returned by the hardware with
	 * attempt at interpretation (unless debugging).
	 */
	printf("rd%d %s error:",
	       unit, (bp->b_flags & B_READ) ? "read" : "write");
#ifdef DEBUG
	if (rddebug & RDB_ERROR) {
		/* status info */
		printf("\n    volume: %d, unit: %d\n",
		       (sp->c_vu>>4)&0xF, sp->c_vu&0xF);
		rdprinterr("reject", sp->c_ref, err_reject);
		rdprinterr("fault", sp->c_fef, err_fault);
		rdprinterr("access", sp->c_aef, err_access);
		rdprinterr("info", sp->c_ief, err_info);
		printf("    block: %d, P1-P10: ", hwbn);
		printf("%s", hexstr(*(u_int *)&sp->c_raw[0], 8));
		printf("%s", hexstr(*(u_int *)&sp->c_raw[4], 8));
		printf("%s\n", hexstr(*(u_short *)&sp->c_raw[8], 4));
		/* command */
		printf("    ioc: ");
		printf("%s", hexstr(*(u_int *)&rs->sc_ioc.c_pad, 8));
		printf("%s", hexstr(*(u_short *)&rs->sc_ioc.c_hiaddr, 4));
		printf("%s", hexstr(*(u_int *)&rs->sc_ioc.c_addr, 8));
		printf("%s", hexstr(*(u_short *)&rs->sc_ioc.c_nop2, 4));
		printf("%s", hexstr(*(u_int *)&rs->sc_ioc.c_len, 8));
		printf("%s\n", hexstr(*(u_short *)&rs->sc_ioc.c_cmd, 4));
		return(1);
	}
#endif
	printf(" v%d u%d, R0x%x F0x%x A0x%x I0x%x\n",
	       (sp->c_vu>>4)&0xF, sp->c_vu&0xF,
	       sp->c_ref, sp->c_fef, sp->c_aef, sp->c_ief);
	printf("P1-P10: ");
	printf("%s", hexstr(*(u_int *)&sp->c_raw[0], 8));
	printf("%s", hexstr(*(u_int *)&sp->c_raw[4], 8));
	printf("%s\n", hexstr(*(u_short *)&sp->c_raw[8], 4));
	return(1);
}

int
rdread(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{

	return (physio(rdstrategy, NULL, dev, B_READ, minphys, uio));
}

int
rdwrite(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{

	return (physio(rdstrategy, NULL, dev, B_WRITE, minphys, uio));
}

int
rdioctl(dev, cmd, data, flag, p)
	dev_t dev;
	int cmd;
	caddr_t data;
	int flag;
	struct proc *p;
{
	int unit = rdunit(dev);
	register struct rd_softc *sc = &rd_softc[unit];
	register struct disklabel *lp = &sc->sc_info.ri_label;
	int error, flags;

	switch (cmd) {
	case DIOCGDINFO:
		*(struct disklabel *)data = *lp;
		return (0);

	case DIOCGPART:
		((struct partinfo *)data)->disklab = lp;
		((struct partinfo *)data)->part =
			&lp->d_partitions[rdpart(dev)];
		return (0);

        case DIOCWLABEL:
                if ((flag & FWRITE) == 0)
                        return (EBADF);
		if (*(int *)data)
			sc->sc_flags |= RDF_WLABEL;
		else
			sc->sc_flags &= ~RDF_WLABEL;
		return (0);

        case DIOCSDINFO:
                if ((flag & FWRITE) == 0)
                        return (EBADF);
		return (setdisklabel(lp, (struct disklabel *)data,
				     (sc->sc_flags & RDF_WLABEL) ? 0
				     : sc->sc_info.ri_open));

        case DIOCWDINFO:
		if ((flag & FWRITE) == 0)
			return (EBADF);
		error = setdisklabel(lp, (struct disklabel *)data,
				     (sc->sc_flags & RDF_WLABEL) ? 0
				     : sc->sc_info.ri_open);
		if (error)
			return (error);
		flags = sc->sc_flags;
		sc->sc_flags = RDF_ALIVE | RDF_WLABEL;
		error = writedisklabel(rdlabdev(dev), rdstrategy, lp);
		sc->sc_flags = flags;
		return (error);
	}
	return(EINVAL);
}

int
rdsize(dev)
	dev_t dev;
{
	register int unit = rdunit(dev);
	register struct rd_softc *rs = &rd_softc[unit];
	int psize, didopen = 0;

	if (unit >= NRD || (rs->sc_flags & RDF_ALIVE) == 0)
		return(-1);

	/*
	 * We get called very early on (via swapconf)
	 * without the device being open so we may need
	 * to handle it here.
	 */
	if (rs->sc_info.ri_open == 0) {
		if (rdopen(dev, FREAD|FWRITE, S_IFBLK, NULL))
			return(-1);
		didopen = 1;
	}
	psize = rs->sc_info.ri_label.d_partitions[rdpart(dev)].p_size;
	if (didopen)
		(void) rdclose(dev, FREAD|FWRITE, S_IFBLK, NULL);
	return (psize);
}

#ifdef DEBUG
rdprinterr(str, err, tab)
	char *str;
	short err;
	char *tab[];
{
	register int i;
	int printed;

	if (err == 0)
		return;
	printf("    %s error field:", str, err);
	printed = 0;
	for (i = 0; i < 16; i++)
		if (err & (0x8000 >> i))
			printf("%s%s", printed++ ? " + " : " ", tab[i]);
	printf("\n");
}
#endif

/*
 * Non-interrupt driven, non-dma dump routine.
 */
int
rddump(dev)
	dev_t dev;
{
	int part = rdpart(dev);
	int unit = rdunit(dev);
	register struct rd_softc *rs = &rd_softc[unit];
	register struct hp_device *hp = rs->sc_hd;
	register struct partition *pinfo;
	register daddr_t baddr;
	register int maddr, pages, i;
	char stat;
	extern int lowram, dumpsize;
#ifdef DEBUG
	extern int pmapdebug;
	pmapdebug = 0;
#endif

	/* is drive ok? */
	if (unit >= NRD || (rs->sc_flags & RDF_ALIVE) == 0)
		return (ENXIO);
	pinfo = &rs->sc_info.ri_label.d_partitions[part];
	/* dump parameters in range? */
	if (dumplo < 0 || dumplo >= pinfo->p_size ||
	    pinfo->p_fstype != FS_SWAP)
		return (EINVAL);
	pages = dumpsize;
	if (dumplo + ctod(pages) > pinfo->p_size)
		pages = dtoc(pinfo->p_size - dumplo);
	maddr = lowram;
	baddr = dumplo + pinfo->p_offset;
	/* HPIB idle? */
	if (!hpibreq(&rs->sc_dq)) {
		hpibreset(hp->hp_ctlr);
		rdreset(rs, rs->sc_hd);
		printf("[ drive %d reset ] ", unit);
	}
	for (i = 0; i < pages; i++) {
#define NPGMB	(1024*1024/NBPG)
		/* print out how many Mbs we have dumped */
		if (i && (i % NPGMB) == 0)
			printf("%d ", i / NPGMB);
#undef NPBMG
		rs->sc_ioc.c_unit = C_SUNIT(rs->sc_punit);
		rs->sc_ioc.c_volume = C_SVOL(0);
		rs->sc_ioc.c_saddr = C_SADDR;
		rs->sc_ioc.c_hiaddr = 0;
		rs->sc_ioc.c_addr = RDBTOS(baddr);
		rs->sc_ioc.c_nop2 = C_NOP;
		rs->sc_ioc.c_slen = C_SLEN;
		rs->sc_ioc.c_len = NBPG;
		rs->sc_ioc.c_cmd = C_WRITE;
		hpibsend(hp->hp_ctlr, hp->hp_slave, C_CMD,
			 &rs->sc_ioc.c_unit, sizeof(rs->sc_ioc)-2);
		if (hpibswait(hp->hp_ctlr, hp->hp_slave))
			return (EIO);
		pmap_enter(kernel_pmap, (vm_offset_t)vmmap, maddr,
		    VM_PROT_READ, TRUE);
		hpibsend(hp->hp_ctlr, hp->hp_slave, C_EXEC, vmmap, NBPG);
		(void) hpibswait(hp->hp_ctlr, hp->hp_slave);
		hpibrecv(hp->hp_ctlr, hp->hp_slave, C_QSTAT, &stat, 1);
		if (stat)
			return (EIO);
		maddr += NBPG;
		baddr += ctod(1);
	}
	return (0);
}
#endif