rd.c

早期freebsd实现

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * from: Utah $Hdr: rd.c 1.44 92/12/26$
 *
 *	@(#)rd.c	8.1 (Berkeley) 6/10/93
 */

/*
 * CS80/SS80 disk driver
 */
#include "rd.h"
#if NRD > 0

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/stat.h>
#include <sys/dkstat.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>

#include <hp/dev/device.h>
#include <hp300/dev/rdreg.h>
#include <hp300/dev/rdvar.h>
#ifdef USELEDS
#include <hp300/hp300/led.h>
#endif

#include <vm/vm_param.h>
#include <vm/lock.h>
#include <vm/vm_prot.h>
#include <vm/pmap.h>

int	rdinit(), rdstart(), rdgo(), rdintr();
void	rdstrategy();
struct	driver rddriver = {
	rdinit, "rd", rdstart, rdgo, rdintr,
};

struct	rd_softc rd_softc[NRD];
struct	buf rdtab[NRD];
int	rderrthresh = RDRETRY-1;	/* when to start reporting errors */

#ifdef DEBUG
/* error message tables */
char *err_reject[] = {
	0, 0,
	"channel parity error",		/* 0x2000 */
	0, 0,
	"illegal opcode",		/* 0x0400 */
	"module addressing",		/* 0x0200 */
	"address bounds",		/* 0x0100 */
	"parameter bounds",		/* 0x0080 */
	"illegal parameter",		/* 0x0040 */
	"message sequence",		/* 0x0020 */
	0,
	"message length",		/* 0x0008 */
	0, 0, 0
};

char *err_fault[] = {
	0,
	"cross unit",			/* 0x4000 */
	0,
	"controller fault",		/* 0x1000 */
	0, 0,
	"unit fault",			/* 0x0200 */
	0,
	"diagnostic result",		/* 0x0080 */
	0,
	"operator release request",	/* 0x0020 */
	"diagnostic release request",	/* 0x0010 */
	"internal maintenance release request",	/* 0x0008 */
	0,
	"power fail",			/* 0x0002 */
	"retransmit"			/* 0x0001 */
};

char *err_access[] = {
	"illegal parallel operation",	/* 0x8000 */
	"uninitialized media",		/* 0x4000 */
	"no spares available",		/* 0x2000 */
	"not ready",			/* 0x1000 */
	"write protect",		/* 0x0800 */
	"no data found",		/* 0x0400 */
	0, 0,
	"unrecoverable data overflow",	/* 0x0080 */
	"unrecoverable data",		/* 0x0040 */
	0,
	"end of file",			/* 0x0010 */
	"end of volume",		/* 0x0008 */
	0, 0, 0
};

char *err_info[] = {
	"operator release request",	/* 0x8000 */
	"diagnostic release request",	/* 0x4000 */
	"internal maintenance release request",	/* 0x2000 */
	"media wear",			/* 0x1000 */
	"latency induced",		/* 0x0800 */
	0, 0,
	"auto sparing invoked",		/* 0x0100 */
	0,
	"recoverable data overflow",	/* 0x0040 */
	"marginal data",		/* 0x0020 */
	"recoverable data",		/* 0x0010 */
	0,
	"maintenance track overflow",	/* 0x0004 */
	0, 0
};

struct	rdstats rdstats[NRD];
int	rddebug = 0x80;
#define RDB_FOLLOW	0x01
#define RDB_STATUS	0x02
#define RDB_IDENT	0x04
#define RDB_IO		0x08
#define RDB_ASYNC	0x10
#define RDB_ERROR	0x80
#endif

/*
 * Misc. HW description, indexed by sc_type.
 * Nothing really critical here, could do without it.
 */
struct rdidentinfo rdidentinfo[] = {
	{ RD7946AID,	0,	"7945A",	 108416 },
	{ RD9134DID,	1,	"9134D",	  29088 },
	{ RD9134LID,	1,	"9122S",	   1232 },
	{ RD7912PID,	0,	"7912P",	 128128 },
	{ RD7914PID,	0,	"7914P",	 258048 },
	{ RD7958AID,	0,	"7958A",	 255276 },
	{ RD7957AID,	0,	"7957A",	 159544 },
	{ RD7933HID,	0,	"7933H",	 789958 },
	{ RD9134LID,	1,	"9134L",	  77840 },
	{ RD7936HID,	0,	"7936H",	 600978 },
	{ RD7937HID,	0,	"7937H",	1116102 },
	{ RD7914CTID,	0,	"7914CT",	 258048 },
	{ RD7946AID,	0,	"7946A",	 108416 },
	{ RD9134LID,	1,	"9122D",	   1232 },
	{ RD7957BID,	0,	"7957B",	 159894 },
	{ RD7958BID,	0,	"7958B",	 297108 },
	{ RD7959BID,	0,	"7959B",	 594216 },
	{ RD2200AID,	0,	"2200A",	 654948 },
	{ RD2203AID,	0,	"2203A",	1309896 }
};
int numrdidentinfo = sizeof(rdidentinfo) / sizeof(rdidentinfo[0]);

rdinit(hd)
	register struct hp_device *hd;
{
	register struct rd_softc *rs = &rd_softc[hd->hp_unit];

	rs->sc_hd = hd;
	rs->sc_punit = rdpunit(hd->hp_flags);
	rs->sc_type = rdident(rs, hd);
	if (rs->sc_type < 0)
		return(0);
	rs->sc_dq.dq_ctlr = hd->hp_ctlr;
	rs->sc_dq.dq_unit = hd->hp_unit;
	rs->sc_dq.dq_slave = hd->hp_slave;
	rs->sc_dq.dq_driver = &rddriver;
	rs->sc_flags = RDF_ALIVE;
#ifdef DEBUG
	/* always report errors */
	if (rddebug & RDB_ERROR)
		rderrthresh = 0;
#endif
	return(1);
}

rdident(rs, hd)
	struct rd_softc *rs;
	struct hp_device *hd;
{
	struct rd_describe desc;
	u_char stat, cmd[3];
	int unit, lunit;
	char name[7];
	register int ctlr, slave, id, i;

	ctlr = hd->hp_ctlr;
	slave = hd->hp_slave;
	unit = rs->sc_punit;
	lunit = hd->hp_unit;

	/*
	 * Grab device id and make sure:
	 * 1. It is a CS80 device.
	 * 2. It is one of the types we support.
	 * 3. If it is a 7946, we are accessing the disk unit (0)
	 */
	id = hpibid(ctlr, slave);
#ifdef DEBUG
	if (rddebug & RDB_IDENT)
		printf("hpibid(%d, %d) -> %x\n", ctlr, slave, id);
#endif
	if ((id & 0x200) == 0)
		return(-1);
	for (i = 0; i < numrdidentinfo; i++)
		if (id == rdidentinfo[i].ri_hwid)
			break;
	if (i == numrdidentinfo || unit > rdidentinfo[i].ri_maxunum)
		return(-1);
	id = i;

	/*
	 * Reset drive and collect device description.
	 * Don't really use the description info right now but
	 * might come in handy in the future (for disk labels).
	 */
	rdreset(rs, hd);
	cmd[0] = C_SUNIT(unit);
	cmd[1] = C_SVOL(0);
	cmd[2] = C_DESC;
	hpibsend(ctlr, slave, C_CMD, cmd, sizeof(cmd));
	hpibrecv(ctlr, slave, C_EXEC, &desc, 37);
	hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
	bzero(name, sizeof(name));
	if (!stat) {
		register int n = desc.d_name;
		for (i = 5; i >= 0; i--) {
			name[i] = (n & 0xf) + '0';
			n >>= 4;
		}
		/* use drive characteristics to calculate xfer rate */
		rs->sc_wpms = 1000000 * (desc.d_sectsize/2) / desc.d_blocktime;
	}
#ifdef DEBUG
	if (rddebug & RDB_IDENT) {
		printf("rd%d: name: %x ('%s')\n",
		       lunit, desc.d_name, name);
		printf("  iuw %x, maxxfr %d, ctype %d\n",
		       desc.d_iuw, desc.d_cmaxxfr, desc.d_ctype);
		printf("  utype %d, bps %d, blkbuf %d, burst %d, blktime %d\n",
		       desc.d_utype, desc.d_sectsize,
		       desc.d_blkbuf, desc.d_burstsize, desc.d_blocktime);
		printf("  avxfr %d, ort %d, atp %d, maxint %d, fv %x, rv %x\n",
		       desc.d_uavexfr, desc.d_retry, desc.d_access,
		       desc.d_maxint, desc.d_fvbyte, desc.d_rvbyte);
		printf("  maxcyl/head/sect %d/%d/%d, maxvsect %d, inter %d\n",
		       desc.d_maxcyl, desc.d_maxhead, desc.d_maxsect,
		       desc.d_maxvsectl, desc.d_interleave);
	}
#endif
	/*
	 * Take care of a couple of anomolies:
	 * 1. 7945A and 7946A both return same HW id
	 * 2. 9122S and 9134D both return same HW id
	 * 3. 9122D and 9134L both return same HW id
	 */
	switch (rdidentinfo[id].ri_hwid) {
	case RD7946AID:
		if (bcmp(name, "079450", 6) == 0)
			id = RD7945A;
		else
			id = RD7946A;
		break;

	case RD9134LID:
		if (bcmp(name, "091340", 6) == 0)
			id = RD9134L;
		else
			id = RD9122D;
		break;

	case RD9134DID:
		if (bcmp(name, "091220", 6) == 0)
			id = RD9122S;
		else
			id = RD9134D;
		break;
	}
	printf("rd%d: %s\n", lunit, rdidentinfo[id].ri_desc);
	return(id);
}

rdreset(rs, hd)
	register struct rd_softc *rs;
	register struct hp_device *hd;
{
	u_char stat;

	rs->sc_clear.c_unit = C_SUNIT(rs->sc_punit);
	rs->sc_clear.c_cmd = C_CLEAR;
	hpibsend(hd->hp_ctlr, hd->hp_slave, C_TCMD, &rs->sc_clear,
		sizeof(rs->sc_clear));
	hpibswait(hd->hp_ctlr, hd->hp_slave);
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_QSTAT, &stat, sizeof(stat));
	rs->sc_src.c_unit = C_SUNIT(RDCTLR);
	rs->sc_src.c_nop = C_NOP;
	rs->sc_src.c_cmd = C_SREL;
	rs->sc_src.c_param = C_REL;
	hpibsend(hd->hp_ctlr, hd->hp_slave, C_CMD, &rs->sc_src,
		sizeof(rs->sc_src));
	hpibswait(hd->hp_ctlr, hd->hp_slave);
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_QSTAT, &stat, sizeof(stat));
	rs->sc_ssmc.c_unit = C_SUNIT(rs->sc_punit);
	rs->sc_ssmc.c_cmd = C_SSM;
	rs->sc_ssmc.c_refm = REF_MASK;
	rs->sc_ssmc.c_fefm = FEF_MASK;
	rs->sc_ssmc.c_aefm = AEF_MASK;
	rs->sc_ssmc.c_iefm = IEF_MASK;
	hpibsend(hd->hp_ctlr, hd->hp_slave, C_CMD, &rs->sc_ssmc,
		sizeof(rs->sc_ssmc));
	hpibswait(hd->hp_ctlr, hd->hp_slave);
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_QSTAT, &stat, sizeof(stat));
#ifdef DEBUG
	rdstats[hd->hp_unit].rdresets++;
#endif
}

/*
 * Read or constuct a disklabel
 */
int
rdgetinfo(dev)
	dev_t dev;
{
	int unit = rdunit(dev);
	register struct rd_softc *rs = &rd_softc[unit];
	register struct disklabel *lp = &rs->sc_info.ri_label;
	register struct partition *pi;
	char *msg, *readdisklabel();

	/*
	 * Set some default values to use while reading the label
	 * or to use if there isn't a label.
	 */
	bzero((caddr_t)lp, sizeof *lp);
	lp->d_type = DTYPE_HPIB;
	lp->d_secsize = DEV_BSIZE;
	lp->d_nsectors = 32;
	lp->d_ntracks = 20;
	lp->d_ncylinders = 1;
	lp->d_secpercyl = 32*20;
	lp->d_npartitions = 3;
	lp->d_partitions[2].p_offset = 0;
	lp->d_partitions[2].p_size = LABELSECTOR+1;

	/*
	 * Now try to read the disklabel
	 */
	msg = readdisklabel(rdlabdev(dev), rdstrategy, lp);
	if (msg == NULL)
		return(0);

	pi = lp->d_partitions;
	printf("rd%d: WARNING: %s, ", unit, msg);
#ifdef COMPAT_NOLABEL
	printf("using old default partitioning\n");
	rdmakedisklabel(unit, lp);
#else
	printf("defining `c' partition as entire disk\n");
	pi[2].p_size = rdidentinfo[rs->sc_type].ri_nblocks;
#endif
	return(0);
}

int
rdopen(dev, flags, mode, p)
	dev_t dev;
	int flags, mode;
	struct proc *p;
{
	register int unit = rdunit(dev);
	register struct rd_softc *rs = &rd_softc[unit];
	int error, mask;

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

	/*
	 * Wait for any pending opens/closes to complete
	 */
	while (rs->sc_flags & (RDF_OPENING|RDF_CLOSING))
		sleep((caddr_t)rs, PRIBIO);

	/*
	 * On first open, get label and partition info.
	 * We may block reading the label, so be careful
	 * to stop any other opens.
	 */
	if (rs->sc_info.ri_open == 0) {
		rs->sc_flags |= RDF_OPENING;
		error = rdgetinfo(dev);
		rs->sc_flags &= ~RDF_OPENING;
		wakeup((caddr_t)rs);
		if (error)
			return(error);
	}
	if (rs->sc_hd->hp_dk >= 0) {
		/* guess at xfer rate based on 3600 rpm (60 rps) */
		if (rs->sc_wpms == 0)
			rs->sc_wpms = 60 * rs->sc_info.ri_label.d_nsectors
				* DEV_BSIZE / 2;
		dk_wpms[rs->sc_hd->hp_dk] = rs->sc_wpms;
	}

	mask = 1 << rdpart(dev);
	if (mode == S_IFCHR)
		rs->sc_info.ri_copen |= mask;
	else
		rs->sc_info.ri_bopen |= mask;
	rs->sc_info.ri_open |= mask;
	return(0);
}

int
rdclose(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
{
	int unit = rdunit(dev);
	register struct rd_softc *rs = &rd_softc[unit];
	register struct rdinfo *ri = &rs->sc_info;
	int mask, s;

	mask = 1 << rdpart(dev);
	if (mode == S_IFCHR)
		ri->ri_copen &= ~mask;
	else
		ri->ri_bopen &= ~mask;
	ri->ri_open = ri->ri_bopen | ri->ri_copen;
	/*
	 * On last close, we wait for all activity to cease since
	 * the label/parition info will become invalid.  Since we
	 * might sleep, we must block any opens while we are here.
	 * Note we don't have to about other closes since we know
	 * we are the last one.
	 */
	if (ri->ri_open == 0) {
		rs->sc_flags |= RDF_CLOSING;
		s = splbio();
		while (rdtab[unit].b_active) {
			rs->sc_flags |= RDF_WANTED;
			sleep((caddr_t)&rdtab[unit], PRIBIO);
		}
		splx(s);
		rs->sc_flags &= ~(RDF_CLOSING|RDF_WLABEL);
		wakeup((caddr_t)rs);
	}
	return(0);
}

void
rdstrategy(bp)
	register struct buf *bp;
{
	int unit = rdunit(bp->b_dev);
	register struct rd_softc *rs = &rd_softc[unit];
	register struct buf *dp = &rdtab[unit];
	register struct partition *pinfo;
	register daddr_t bn;
	register int sz, s;

#ifdef DEBUG
	if (rddebug & RDB_FOLLOW)
		printf("rdstrategy(%x): dev %x, bn %x, bcount %x, %c\n",
		       bp, bp->b_dev, bp->b_blkno, bp->b_bcount,
		       (bp->b_flags & B_READ) ? 'R' : 'W');
#endif
	bn = bp->b_blkno;
	sz = howmany(bp->b_bcount, DEV_BSIZE);
	pinfo = &rs->sc_info.ri_label.d_partitions[rdpart(bp->b_dev)];
	if (bn < 0 || bn + sz > pinfo->p_size) {
		sz = pinfo->p_size - bn;
		if (sz == 0) {
			bp->b_resid = bp->b_bcount;
			goto done;
		}
		if (sz < 0) {
			bp->b_error = EINVAL;
			goto bad;
		}
		bp->b_bcount = dbtob(sz);
	}
	/*
	 * Check for write to write protected label
	 */
	if (bn + pinfo->p_offset <= LABELSECTOR &&
#if LABELSECTOR != 0
	    bn + pinfo->p_offset + sz > LABELSECTOR &&
#endif
	    !(bp->b_flags & B_READ) && !(rs->sc_flags & RDF_WLABEL)) {
		bp->b_error = EROFS;
		goto bad;
	}
	bp->b_cylin = bn + pinfo->p_offset;
	s = splbio();
	disksort(dp, bp);
	if (dp->b_active == 0) {
		dp->b_active = 1;
		rdustart(unit);
	}
	splx(s);
	return;
bad:
	bp->b_flags |= B_ERROR;
done:
	biodone(bp);
}

/*
 * Called from timeout() when handling maintenance releases
 */
void
rdrestart(arg)
	void *arg;
{
	int s = splbio();
	rdustart((int)arg);
	splx(s);
}

rdustart(unit)