NetBSD/sys/dev/lsu.c

570 lines
13 KiB
C

/* $NetBSD$ */
/*-
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Doran and Charles M. Hannum.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Disk driver for use by RAID controllers.
*/
#include "rnd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/endian.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/dkio.h>
#include <sys/stat.h>
#include <sys/lock.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/syslog.h>
#if NRND > 0
#include <sys/rnd.h>
#endif
#include <dev/lsuvar.h>
static void lsugetdefaultlabel(struct lsu_softc *, struct disklabel *);
static void lsugetdisklabel(struct lsu_softc *);
static int lsulock(struct lsu_softc *);
static void lsuminphys(struct buf *bp);
static void lsushutdown(void *);
static void lsustart(struct lsu_softc *, struct buf *);
static void lsuunlock(struct lsu_softc *);
extern struct cfdriver lsu_cd;
static struct dkdriver lsudkdriver = { lsustrategy };
static void *lsu_sdh;
void
lsuattach(struct lsu_softc *sc)
{
char buf[9];
/* Initialise and attach the disk structure. */
sc->sc_dk.dk_driver = &lsudkdriver;
sc->sc_dk.dk_name = sc->sc_dv.dv_xname;
disk_attach(&sc->sc_dk);
if ((sc->sc_flags & LSUF_ENABLED) == 0) {
printf("%s: disabled\n", sc->sc_dv.dv_xname);
return;
}
if (sc->sc_maxxfer > MAXPHYS)
sc->sc_maxxfer = MAXPHYS;
format_bytes(buf, sizeof(buf), (u_int64_t)sc->sc_secperunit *
sc->sc_secsize);
printf("%s: %s, %d cyl, %d head, %d sec, %d bytes/sect x %d sectors\n",
sc->sc_dv.dv_xname, buf, sc->sc_ncylinders, sc->sc_nheads,
sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit);
#if NRND > 0
/* Attach the device into the rnd source list. */
rnd_attach_source(&sc->sc_rnd_source, sc->sc_dv.dv_xname,
RND_TYPE_DISK, 0);
#endif
/* Set the `shutdownhook'. */
if (lsu_sdh == NULL)
lsu_sdh = shutdownhook_establish(lsushutdown, NULL);
BUFQ_INIT(&sc->sc_bufq);
}
static void
lsushutdown(void *cookie)
{
struct lsu_softc *sc;
int i;
for (i = 0; i < lsu_cd.cd_ndevs; i++) {
if ((sc = device_lookup(&lsu_cd, i)) == NULL)
continue;
if (sc->sc_flush != NULL && (*sc->sc_flush)(sc) != 0)
printf("%s: unable to flush cache\n",
sc->sc_dv.dv_xname);
}
}
int
lsuopen(dev_t dev, int flags, int fmt, struct proc *p)
{
struct lsu_softc *sc;
int unit, part;
unit = DISKUNIT(dev);
if ((sc = device_lookup(&lsu_cd, unit))== NULL)
return (ENXIO);
if ((sc->sc_flags & LSUF_ENABLED) == 0)
return (ENODEV);
part = DISKPART(dev);
lsulock(sc);
if (sc->sc_dk.dk_openmask == 0)
lsugetdisklabel(sc);
/* Check that the partition exists. */
if (part != RAW_PART && (part >= sc->sc_dk.dk_label->d_npartitions ||
sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) {
lsuunlock(sc);
return (ENXIO);
}
/* Ensure only one open at a time. */
switch (fmt) {
case S_IFCHR:
sc->sc_dk.dk_copenmask |= (1 << part);
break;
case S_IFBLK:
sc->sc_dk.dk_bopenmask |= (1 << part);
break;
}
sc->sc_dk.dk_openmask =
sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask;
lsuunlock(sc);
return (0);
}
int
lsuclose(dev_t dev, int flags, int fmt, struct proc *p)
{
struct lsu_softc *sc;
int part, unit;
unit = DISKUNIT(dev);
part = DISKPART(dev);
sc = device_lookup(&lsu_cd, unit);
lsulock(sc);
switch (fmt) {
case S_IFCHR:
sc->sc_dk.dk_copenmask &= ~(1 << part);
break;
case S_IFBLK:
sc->sc_dk.dk_bopenmask &= ~(1 << part);
break;
}
sc->sc_dk.dk_openmask =
sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask;
if (sc->sc_dk.dk_openmask == 0 && sc->sc_flush != NULL)
if ((*sc->sc_flush)(sc) != 0)
printf("%s: unable to flush cache\n",
sc->sc_dv.dv_xname);
lsuunlock(sc);
return (0);
}
int
lsuread(dev_t dev, struct uio *uio, int ioflag)
{
return (physio(lsustrategy, NULL, dev, B_READ, lsuminphys, uio));
}
int
lsuwrite(dev_t dev, struct uio *uio, int ioflag)
{
return (physio(lsustrategy, NULL, dev, B_WRITE, lsuminphys, uio));
}
int
lsuioctl(dev_t dev, u_long cmd, caddr_t addr, int32_t flag, struct proc *p)
{
struct lsu_softc *sc;
int part, unit, error;
unit = DISKUNIT(dev);
part = DISKPART(dev);
sc = device_lookup(&lsu_cd, unit);
error = 0;
switch (cmd) {
case DIOCGDINFO:
memcpy(addr, sc->sc_dk.dk_label, sizeof(struct disklabel));
return (0);
case DIOCGPART:
((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label;
((struct partinfo *)addr)->part =
&sc->sc_dk.dk_label->d_partitions[part];
break;
case DIOCWDINFO:
case DIOCSDINFO:
if ((flag & FWRITE) == 0)
return (EBADF);
if ((error = lsulock(sc)) != 0)
return (error);
sc->sc_flags |= LSUF_LABELLING;
error = setdisklabel(sc->sc_dk.dk_label,
(struct disklabel *)addr, /*sc->sc_dk.dk_openmask : */0,
sc->sc_dk.dk_cpulabel);
if (error == 0 && cmd == DIOCWDINFO)
error = writedisklabel(
MAKEDISKDEV(major(dev), DISKUNIT(dev), RAW_PART),
lsustrategy, sc->sc_dk.dk_label,
sc->sc_dk.dk_cpulabel);
sc->sc_flags &= ~LSUF_LABELLING;
lsuunlock(sc);
break;
case DIOCWLABEL:
if ((flag & FWRITE) == 0)
return (EBADF);
if (*(int *)addr)
sc->sc_flags |= LSUF_WLABEL;
else
sc->sc_flags &= ~LSUF_WLABEL;
break;
case DIOCGDEFLABEL:
lsugetdefaultlabel(sc, (struct disklabel *)addr);
break;
default:
error = ENOTTY;
break;
}
return (error);
}
void
lsustrategy(struct buf *bp)
{
struct lsu_softc *sc;
int s;
sc = device_lookup(&lsu_cd, DISKUNIT(bp->b_dev));
s = splbio();
if (sc->sc_queuecnt == sc->sc_maxqueuecnt) {
BUFQ_INSERT_TAIL(&sc->sc_bufq, bp);
splx(s);
return;
}
splx(s);
lsustart(sc, bp);
}
static void
lsustart(struct lsu_softc *sc, struct buf *bp)
{
struct disklabel *lp;
int part, s, rv;
part = DISKPART(bp->b_dev);
lp = sc->sc_dk.dk_label;
/*
* The transfer must be a whole number of blocks and the offset must
* not be negative.
*/
if ((bp->b_bcount % lp->d_secsize) != 0 || bp->b_blkno < 0) {
bp->b_flags |= B_ERROR;
biodone(bp);
}
/*
* If it's a null transfer, return.
*/
if (bp->b_bcount == 0) {
bp->b_resid = bp->b_bcount;
biodone(bp);
return;
}
/*
* Do bounds checking and adjust the transfer. If error, process.
* If past the end of partition, just return.
*/
if (part != RAW_PART &&
bounds_check_with_label(bp, lp,
(sc->sc_flags & (LSUF_WLABEL | LSUF_LABELLING)) != 0) <= 0) {
bp->b_resid = bp->b_bcount;
biodone(bp);
return;
}
/*
* Convert the logical block number to a physical one and put it in
* terms of the device's logical block size.
*/
if (lp->d_secsize >= DEV_BSIZE)
bp->b_rawblkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE);
else
bp->b_rawblkno = bp->b_blkno * (DEV_BSIZE / lp->d_secsize);
if (bp->b_dev != RAW_PART)
bp->b_rawblkno += lp->d_partitions[part].p_offset;
s = splbio();
disk_busy(&sc->sc_dk);
sc->sc_queuecnt++;
splx(s);
if ((rv = (*sc->sc_start)(sc, bp)) != 0) {
bp->b_error = rv;
bp->b_flags |= B_ERROR;
bp->b_resid = bp->b_bcount;
s = splbio();
lsudone(sc, bp);
splx(s);
}
}
void
lsudone(struct lsu_softc *sc, struct buf *bp)
{
if ((bp->b_flags & B_ERROR) != 0) {
diskerr(bp, "lsu", "error", LOG_PRINTF, 0, sc->sc_dk.dk_label);
printf("\n");
}
disk_unbusy(&sc->sc_dk, bp->b_bcount - bp->b_resid);
#if NRND > 0
rnd_add_uint32(&sc->sc_rnd_source, bp->b_rawblkno);
#endif
biodone(bp);
sc->sc_queuecnt--;
if ((bp = BUFQ_FIRST(&sc->sc_bufq)) != NULL) {
BUFQ_REMOVE(&sc->sc_bufq, bp);
lsustart(sc, bp);
}
}
int
lsusize(dev_t dev)
{
struct lsu_softc *sc;
int part, unit, omask, size;
unit = DISKUNIT(dev);
if ((sc = device_lookup(&lsu_cd, unit)) == NULL)
return (ENODEV);
if ((sc->sc_flags & LSUF_ENABLED) == 0)
return (ENODEV);
part = DISKPART(dev);
omask = sc->sc_dk.dk_openmask & (1 << part);
if (omask == 0 && lsuopen(dev, 0, S_IFBLK, NULL) != 0)
return (-1);
else if (sc->sc_dk.dk_label->d_partitions[part].p_fstype != FS_SWAP)
size = -1;
else
size = sc->sc_dk.dk_label->d_partitions[part].p_size *
(sc->sc_dk.dk_label->d_secsize / DEV_BSIZE);
if (omask == 0 && lsuclose(dev, 0, S_IFBLK, NULL) != 0)
return (-1);
return (size);
}
/*
* Load the label information from the specified device.
*/
static void
lsugetdisklabel(struct lsu_softc *sc)
{
const char *errstring;
lsugetdefaultlabel(sc, sc->sc_dk.dk_label);
/* Call the generic disklabel extraction routine. */
errstring = readdisklabel(MAKEDISKDEV(0, sc->sc_dv.dv_unit, RAW_PART),
lsustrategy, sc->sc_dk.dk_label, sc->sc_dk.dk_cpulabel);
if (errstring != NULL)
printf("%s: %s\n", sc->sc_dv.dv_xname, errstring);
}
/*
* Construct a ficticious label.
*/
static void
lsugetdefaultlabel(struct lsu_softc *sc, struct disklabel *lp)
{
memset(lp, 0, sizeof(struct disklabel));
lp->d_secsize = sc->sc_secsize;
lp->d_ntracks = sc->sc_nheads;
lp->d_nsectors = sc->sc_nsectors;
lp->d_ncylinders = sc->sc_ncylinders;
lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
lp->d_type = DTYPE_LSU;
strcpy(lp->d_typename, "unknown");
strcpy(lp->d_packname, "fictitious");
lp->d_secperunit = sc->sc_secperunit;
lp->d_rpm = 7200;
lp->d_interleave = 1;
lp->d_flags = 0;
lp->d_partitions[RAW_PART].p_offset = 0;
lp->d_partitions[RAW_PART].p_size =
lp->d_secperunit * (lp->d_secsize / DEV_BSIZE);
lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
lp->d_npartitions = RAW_PART + 1;
lp->d_magic = DISKMAGIC;
lp->d_magic2 = DISKMAGIC;
lp->d_checksum = dkcksum(lp);
}
/*
* Wait interruptibly for an exclusive lock.
*
* XXX Several drivers do this; it should be abstracted and made MP-safe.
*/
static int
lsulock(struct lsu_softc *sc)
{
int error;
while ((sc->sc_flags & LSUF_LKHELD) != 0) {
sc->sc_flags |= LSUF_LKWANTED;
if ((error = tsleep(sc, PRIBIO | PCATCH, "lsulck", 0)) != 0)
return (error);
}
sc->sc_flags |= LSUF_LKHELD;
return (0);
}
/*
* Unlock and wake up any waiters.
*/
static void
lsuunlock(struct lsu_softc *sc)
{
sc->sc_flags &= ~LSUF_LKHELD;
if ((sc->sc_flags & LSUF_LKWANTED) != 0) {
sc->sc_flags &= ~LSUF_LKWANTED;
wakeup(sc);
}
}
/*
* Take a dump.
*/
int
lsudump(dev_t dev, daddr_t blkno, caddr_t va, size_t size)
{
struct lsu_softc *sc;
struct disklabel *lp;
int unit, part, nsects, sectoff, towrt, nblk, maxblkcnt, rv;
static int dumping;
/* Check if recursive dump; if so, punt. */
if (dumping)
return (EFAULT);
dumping = 1;
if (sc->sc_dump == NULL)
return (ENXIO);
unit = DISKUNIT(dev);
if ((sc = device_lookup(&lsu_cd, unit)) == NULL)
return (ENXIO);
if ((sc->sc_flags & LSUF_ENABLED) == 0)
return (ENODEV);
part = DISKPART(dev);
/* Convert to disk sectors. Request must be a multiple of size. */
lp = sc->sc_dk.dk_label;
if ((size % lp->d_secsize) != 0)
return (EFAULT);
towrt = size / lp->d_secsize;
blkno = dbtob(blkno) / lp->d_secsize; /* blkno in DEV_BSIZE units */
nsects = lp->d_partitions[part].p_size;
sectoff = lp->d_partitions[part].p_offset;
/* Check transfer bounds against partition size. */
if ((blkno < 0) || ((blkno + towrt) > nsects))
return (EINVAL);
/* Offset block number to start of partition. */
blkno += sectoff;
/* Start dumping and return when done. */
maxblkcnt = sc->sc_maxxfer / sc->sc_secsize;
while (towrt > 0) {
nblk = max(maxblkcnt, towrt);
if ((rv = (*sc->sc_dump)(sc, va, blkno, nblk)) != 0)
return (rv);
towrt -= nblk;
blkno += nblk;
va += nblk * sc->sc_secsize;
}
dumping = 0;
return (0);
}
/*
* Adjust the size of a transfer.
*/
static void
lsuminphys(struct buf *bp)
{
struct lsu_softc *sc;
sc = device_lookup(&lsu_cd, DISKUNIT(bp->b_dev));
if (bp->b_bcount > sc->sc_maxxfer)
bp->b_bcount = sc->sc_maxxfer;
minphys(bp);
}