sd.c

早期freebsd实现

/*
 * Copyright (c) 1992 OMRON Corporation.
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * OMRON Corporation.
 *
 * 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.
 *
 *	@(#)sd.c	8.3 (Berkeley) 12/7/93
 */

/*
 * sd.c -- SCSI Disk Device Driver
 * remaked by A.Fujita, MAR-22-1992
 */

/*
 * SCSI CCS (Command Command Set) disk driver.
 */
#include "sd.h"
#if NSD > 0

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/dkstat.h>
#include <sys/proc.h>
#include <sys/disklabel.h>

#include <luna68k/dev/device.h>
#include <luna68k/dev/screg.h>
#include <luna68k/dev/scvar.h>

int	sdinit(), sdstrategy(), sdstart(), sdintr();

struct	driver sddriver = {
	sdinit, "sd", sdstart, (int (*)()) 0, sdintr, (int (*)()) 0
};

struct	disklabel sdlabel[NSD];

struct	sd_softc {
	struct	hp_device *sc_hd;
	struct	scsi_queue sc_dq;
	short	sc_flags;
	short	sc_type;	/* drive type */
	short	sc_punit;	/* physical unit (scsi lun) */
	u_int	sc_blks;	/* number of blocks on device */
	int	sc_blksize;	/* device block size in bytes */
	u_int	sc_wpms;	/* average xfer rate in 16 bit wds/sec. */
} sd_softc[NSD];

/* sc_flags values */
#define	SDF_ALIVE	0x1

struct	buf sdtab[NSD];
struct	scsi_fmt_sense sdsense[NSD];

static struct scsi_fmt_cdb sd_read_cmd = { 10, CMD_READ_EXT };
static struct scsi_fmt_cdb sd_write_cmd = { 10, CMD_WRITE_EXT };

#define	sdunit(x)	((minor(x) >> 3) & 0x7)
#define sdpart(x)	(minor(x) & 0x7)
#define	sdpunit(x)	((x) & 7)
#define sdminor(unit, part)	(((unit) << 3) | (part))

#define	b_lba		b_resid

#define	SDRETRY		3	/* IO retry count */

struct sd_iostat {
	int imax;
	int imin;
	int omax;
	int omin;
};

struct sd_iostat sd_iostat[NSD] = {
	{ 14000, -1, 100, -1 },
};

/*
 * Initialize
 */

int
sdinit(hd)
	register struct hp_device *hd;
{
	register struct sd_softc *sc = &sd_softc[hd->hp_unit];
	register struct disklabel *lp;
	char *msg, *sdreadlabel();

	sc->sc_hd = hd;
	sc->sc_punit = sdpunit(hd->hp_flags);
	sc->sc_type = sdident(sc, hd);
	if (sc->sc_type < 0)
		return(0);
	sc->sc_dq.dq_ctlr = hd->hp_ctlr;
	sc->sc_dq.dq_unit = hd->hp_unit;
	sc->sc_dq.dq_slave = hd->hp_slave;
	sc->sc_dq.dq_driver = &sddriver;

	/*
	 * Use the default sizes until we've read the label,
	 * or longer if there isn't one there.
	 */
	lp = &sdlabel[hd->hp_unit];

	if (lp->d_secpercyl == 0) {
		lp->d_secsize = DEV_BSIZE;
		lp->d_nsectors = 32;
		lp->d_ntracks = 20;
		lp->d_secpercyl = 32*20;
		lp->d_npartitions = 1;
		lp->d_partitions[0].p_offset = 0;
		lp->d_partitions[0].p_size = LABELSECTOR + 1;
	}

	/*
	 * read disklabel
	 */
	if (msg = sdreadlabel(makedev(4, (hd->hp_unit<<3)), sdstrategy, lp)) {
		if (msg != NULL) {
			printf("sd%d: %s\n", hd->hp_unit, msg);
			return(0);
		}
	}

	sc->sc_flags = SDF_ALIVE;
	return(1);
}

static struct scsi_inquiry inqbuf;
static struct scsi_fmt_cdb inq = {
	6,
	CMD_INQUIRY, 0, 0, 0, sizeof(inqbuf), 0
};

static u_long capbuf[2];
struct scsi_fmt_cdb cap = {
	10,
	CMD_READ_CAPACITY, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

int
sdident(sc, hd)
	struct sd_softc *sc;
	struct hp_device *hd;
{
	char idstr[32];
	int unit;
	register int ctlr, slave;
	register int i;
	register int tries = 10;

	ctlr = hd->hp_ctlr;
	slave = hd->hp_slave;
	unit = sc->sc_punit;

	/*
	 * See if unit exists and is a disk then read block size & nblocks.
	 */
	while ((i = sc_test_unit_rdy(ctlr, slave, unit)) != 0) {
		if (i < 0 || --tries < 0)
			return (-1);
		if (i == STS_CHECKCOND) {
			u_char sensebuf[8];
			struct scsi_xsense *sp = (struct scsi_xsense *)sensebuf;

			sc_request_sense(ctlr, slave, unit, sensebuf, 8);
			if (sp->class == 7 && sp->key == 6)
				/* drive doing an RTZ -- give it a while */
				DELAY(1000000);
		}
		DELAY(1000);
	}
	if (scsi_immed_command(ctlr, slave, unit, &inq, (u_char *)&inqbuf,
			       sizeof(inqbuf)) ||
	    scsi_immed_command(ctlr, slave, unit, &cap, (u_char *)&capbuf,
			       sizeof(capbuf)))
		/* doesn't exist or not a CCS device */
		return (-1);

	switch (inqbuf.type) {
	case 0:		/* disk */
	case 4:		/* WORM */
	case 5:		/* CD-ROM */
	case 7:		/* Magneto-optical */
		break;
	default:	/* not a disk */
		return (-1);
	}
	sc->sc_blks    = capbuf[0];
	sc->sc_blksize = capbuf[1];

	bcopy((caddr_t)&inqbuf.vendor_id, (caddr_t)idstr, 28);
	for (i = 27; i > 23; --i)
		if (idstr[i] != ' ')
			break;
	idstr[i+1] = 0;
	for (i = 23; i > 7; --i)
		if (idstr[i] != ' ')
			break;
	idstr[i+1] = 0;
	for (i = 7; i >= 0; --i)
		if (idstr[i] != ' ')
			break;
	idstr[i+1] = 0;
	printf("sd%d: %s %s rev %s", hd->hp_unit, idstr, &idstr[8],
	       &idstr[24]);

	printf(", %d %d byte blocks\n", sc->sc_blks, sc->sc_blksize);
	if (sc->sc_blksize != DEV_BSIZE) {
		printf("sd%d: need %d byte blocks - drive ignored\n", unit, DEV_BSIZE);
		return(1);
	}

	sc->sc_wpms = 32 * (60 * DEV_BSIZE / 2);	/* XXX */
	return(inqbuf.type);
}


/*
 * Open
 */

int
sdopen(dev, flags, mode, p)
	dev_t dev;
	int flags, mode;
	struct proc *p;
{
	register int unit = sdunit(dev);
	register struct sd_softc *sc = &sd_softc[unit];

	if (unit >= NSD)
		return(ENXIO);
	if ((sc->sc_flags & SDF_ALIVE) == 0 && suser(p->p_ucred, &p->p_acflag))
		return(ENXIO);

	if (sc->sc_hd->hp_dk >= 0)
		dk_wpms[sc->sc_hd->hp_dk] = sc->sc_wpms;
	return(0);
}


/*
 * Close
 */

int
sdclose(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
{
	return(0);
}

/*
 * Strategy
 */

int
sdstrategy(bp)
	register struct buf *bp;
{
	register int unit = sdunit(bp->b_dev);
	register int part = sdpart(bp->b_dev);
	register struct sd_softc *sc = &sd_softc[unit];
	register struct disklabel *lp = &sdlabel[unit];
	register struct partition *pp = &(lp->d_partitions[part]);
	register struct buf *dp = &sdtab[unit];
	register daddr_t bn;
	register int sz, s;

	bn = bp->b_blkno;
	sz = howmany(bp->b_bcount, DEV_BSIZE);

	/* check that tracsfer is within a drive's partition */

	if (bn < 0 || (bn + sz) > pp->p_size) {
		sz = pp->p_size - bn;
		if (sz == 0) {
			bp->b_resid = bp->b_bcount;
			goto done;
		}
		if (sz < 0) {
			bp->b_error = EINVAL;
			bp->b_flags |= B_ERROR;
			goto done;
		}
		bp->b_bcount = dbtob(sz);
	}

	/* calculate LBA for transfer */

	bp->b_lba = bn + pp->p_offset;

	/* raise priority to block sdintr */

	s = splbio();

	/* call disksort to sort request into drive queue */

	disksort(dp, bp);

	if (dp->b_active == 0) {			/*  */
		dp->b_active = 1;
		sdustart(unit);
	}

	/* lower priority */

	splx(s);

	return;

done:
	biodone(bp);
}

int
sdustart(unit)
	register int unit;
{
	register struct sd_softc *sc = &sd_softc[unit];
	register struct hp_device *hp = sc->sc_hd;
	register struct scsi_queue *dq = &sc->sc_dq;
	register struct buf *bp = sdtab[unit].b_actf;
	register struct scsi_fmt_cdb *cmd;

	cmd = bp->b_flags & B_READ? &sd_read_cmd : &sd_write_cmd;
	*(int *)(&cmd->cdb[2]) = bp->b_lba;
	*(u_short *)(&cmd->cdb[7]) = howmany(bp->b_bcount, DEV_BSIZE);

	dq->dq_cdb   = cmd;
	dq->dq_bp    = bp;
	dq->dq_flags = DQ_DISCONNECT;	/* SCSI Disconnect */

	if (screq(dq))
		sdstart(unit);
}

int
sdstart(unit)
	register int unit;