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[unix-history] / sys / i386 / isa / wd.c
static int wdtest = 0;
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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: @(#)wx.c 7.2 (Berkeley) 5/9/91
* $Id: wx.c,v 1.5 1993/11/19 06:30:02 davidg Exp $
*/
/* TODO:peel out buffer at low ipl, speed improvement */
#include "wd.h"
#if NWDC > 0
#include "param.h"
#include "dkbad.h"
#include "systm.h"
#include "kernel.h"
#include "conf.h"
#include "file.h"
#include "stat.h"
#include "ioctl.h"
#include "disklabel.h"
#include "buf.h"
#include "uio.h"
#include "malloc.h"
#include "machine/cpu.h"
#include "i386/isa/isa.h"
#include "i386/isa/isa_device.h"
#include "i386/isa/icu.h"
#include "i386/isa/wdreg.h"
#include "syslog.h"
#include "vm/vm.h"
#ifndef WDCTIMEOUT
#define WDCTIMEOUT 10000000 /* arbitrary timeout for drive ready waits */
#endif
#define RETRIES 5 /* number of retries before giving up */
#define RECOVERYTIME 500000 /* usec for controller to recover after err */
#define MAXTRANSFER 32 /* max size of transfer in page clusters */
#define wdnoreloc(dev) (minor(dev) & 0x80) /* ignore partition table */
#define wddospart(dev) (minor(dev) & 0x40) /* use dos partitions */
#define wdunit(dev) ((minor(dev) & 0x38) >> 3)
#define wdpart(dev) (minor(dev) & 0x7)
#define makewddev(maj, unit, part) (makedev(maj,((unit<<3)+part)))
#define WDRAW 3 /* 'd' partition isn't a partition! */
#define b_cylin b_resid /* cylinder number for doing IO to */
/* shares an entry in the buf struct */
#define id_physid id_scsiid /* this biotab field doubles as a field */
/* for the physical unit number on the controller */
/*
* Drive states. Used to initialize drive.
*/
#define CLOSED 0 /* disk is closed. */
#define WANTOPEN 1 /* open requested, not started */
#define RECAL 2 /* doing restore */
#define OPEN 3 /* done with open */
/*
* The structure of a disk drive.
*/
struct disk {
long dk_bc; /* byte count left */
short dk_skip; /* blocks already transferred */
char dk_ctrlr; /* physical controller number */
char dk_unit; /* physical unit number */
char dk_lunit; /* logical unit number */
char dk_state; /* control state */
u_char dk_status; /* copy of status reg. */
u_char dk_error; /* copy of error reg. */
short dk_port; /* i/o port base */
u_long dk_copenpart; /* character units open on this drive */
u_long dk_bopenpart; /* block units open on this drive */
u_long dk_openpart; /* all units open on this drive */
short dk_wlabel; /* label writable? */
short dk_flags; /* drive characteistics found */
#define DKFL_DOSPART 0x00001 /* has DOS partition table */
#define DKFL_SINGLE 0x00004 /* sector at a time mode */
#define DKFL_ERROR 0x00008 /* processing a disk error */
#define DKFL_BSDLABEL 0x00010 /* has a BSD disk label */
#define DKFL_BADSECT 0x00020 /* has a bad144 badsector table */
#define DKFL_WRITEPROT 0x00040 /* manual unit write protect */
#define DKFL_LABELLING 0x00080 /* readdisklabel() in progress */
struct wdparams dk_params; /* ESDI/IDE drive/controller parameters */
struct disklabel dk_dd; /* device configuration data */
struct dos_partition
dk_dospartitions[NDOSPART]; /* DOS view of disk */
struct dkbad dk_bad; /* bad sector table */
};
/*static*/ struct disk *wddrives[NWD]; /* table of units */
static struct buf wdtab[NWDC];
static struct buf wdutab[NWD]; /* head of queue per drive */
#ifdef notyet
static struct buf rwdbuf[NWD]; /* buffers for raw IO */
#endif
static long wdxfer[NWD]; /* count of transfers */
static int wdprobe(struct isa_device *dvp);
static int wdattach(struct isa_device *dvp);
static void wdustart(struct disk *du);
static void wdstart(int ctrlr);
static int wdcontrol(struct buf *bp);
static int wdcommand(struct disk *du, u_int cylinder, u_int head,
u_int sector, u_int count, u_int command);
static int wdsetctlr(struct disk *du);
static int wdwsetctlr(struct disk *du);
static int wdgetctlr(struct disk *du);
static void wderror(struct buf *bp, struct disk *du, char *mesg);
static int wdreset(struct disk *du);
static void wdsleep(int ctrlr, char *wmesg);
static int wdunwedge(struct disk *du);
static int wdwait(struct disk *du, u_char bits_wanted);
struct isa_driver wdcdriver = {
wdprobe, wdattach, "wdc",
};
/*
* Probe for controller.
*/
static int
wdprobe(struct isa_device *dvp)
{
int unit = dvp->id_unit;
int u;
struct disk *du;
int wdc;
if (unit >= NWDC) /* 31 Jul 92*/
return(0);
du = malloc (sizeof(struct disk), M_TEMP, M_NOWAIT);
bzero (du, sizeof(struct disk)); /* 31 Jul 92*/
du->dk_ctrlr = dvp->id_unit;
du->dk_unit = 0;
du->dk_lunit = 0;
wdc = du->dk_port = dvp->id_iobase;
/* check if we have registers that work */
outb(wdc+wd_cyl_lo, 0xa5) ; /* wd_cyl_lo is read/write */
if(inb(wdc+wd_cyl_lo) != 0xa5)
goto nodevice;
if (wdreset(du) != 0 && (DELAY(RECOVERYTIME), wdreset(du)) != 0)
goto nodevice;
/* execute a controller only command */
if (wdcommand(du, 0, 0, 0, 0, WDCC_DIAGNOSE) != 0
|| wdwait(du, 0) != 0)
goto nodevice;
free(du, M_TEMP);
return (IO_WDCSIZE);
nodevice:
free(du, M_TEMP);
return (0);
}
/*
* Attach each drive if possible.
*/
static int
wdattach(struct isa_device *dvp)
{
int unit, lunit;
struct isa_device *wdup;
struct disk *du;
if (dvp->id_unit >= NWDC)
return(0);
printf("wdc%d:", dvp->id_unit);
for (wdup = isa_biotab_wdc; wdup->id_driver != 0; wdup++) {
if (wdup->id_iobase != dvp->id_iobase)
continue;
lunit = wdup->id_unit;
if (lunit >= NWD)
continue;
unit = wdup->id_physid;
du = wddrives[lunit] = (struct disk *)
malloc (sizeof(struct disk), M_TEMP, M_NOWAIT);
bzero (du, sizeof(struct disk));
bzero (&wdutab[lunit], sizeof(struct buf));
#ifdef notyet
bzero (&rwdbuf[lunit], sizeof(struct buf));
#endif
wdxfer[lunit] = 0;
du->dk_ctrlr = dvp->id_unit;
du->dk_unit = unit;
du->dk_lunit = lunit;
du->dk_port = dvp->id_iobase;
/* print out description of drive, suppressing multiple blanks*/
if (wdgetctlr(du) == 0) {
int i, blank;
printf(" [%d: wd%d: ", unit, lunit);
for (i = blank = 0 ; i < sizeof(du->dk_params.wdp_model); i++) {
char c = du->dk_params.wdp_model[i];
if (blank && c == ' ')
continue;
if (blank && c != ' ') {
printf(" %c", c);
blank = 0;
continue;
}
if (c == ' ')
blank = 1;
else
printf("%c", c);
}
printf("]");
}
else {
free(du, M_TEMP);
wddrives[unit] = 0;
printf(" [%d: wd%d]", unit, lunit);
}
}
printf("\n");
return(1);
}
/* Read/write routine for a buffer. Finds the proper unit, range checks
* arguments, and schedules the transfer. Does not wait for the transfer
* to complete. Multi-page transfers are supported. All I/O requests must
* be a multiple of a sector in length.
*/
void
wdstrategy(register struct buf *bp)
{
register struct buf *dp;
struct disk *du; /* Disk unit to do the IO. */
int lunit = wdunit(bp->b_dev);
int s;
/* valid unit, controller, and request? */
if (lunit >= NWD || bp->b_blkno < 0 || (du = wddrives[lunit]) == 0) {
bp->b_error = EINVAL;
bp->b_flags |= B_ERROR;
goto done;
}
/* "soft" write protect check */
if ((du->dk_flags & DKFL_WRITEPROT) && (bp->b_flags & B_READ) == 0) {
bp->b_error = EROFS;
bp->b_flags |= B_ERROR;
goto done;
}
/* have partitions and want to use them? */
if ((du->dk_flags & DKFL_BSDLABEL) != 0 && wdpart(bp->b_dev) != WDRAW) {
/*
* do bounds checking, adjust transfer. if error, process.
* if end of partition, just return
*/
if (bounds_check_with_label(bp, &du->dk_dd, du->dk_wlabel) <= 0)
goto done;
/* otherwise, process transfer request */
}
/* queue transfer on drive, activate drive and controller if idle */
dp = &wdutab[lunit];
s = splbio();
disksort(dp, bp);
if (dp->b_active == 0)
wdustart(du); /* start drive */
/* Pick up changes made by readdisklabel(). */
if (du->dk_flags & DKFL_LABELLING && du->dk_state > RECAL) {
wdsleep(du->dk_ctrlr, "wdlab");
du->dk_state = WANTOPEN;
}
if (wdtab[du->dk_ctrlr].b_active == 0)
wdstart(du->dk_ctrlr); /* start controller */
splx(s);
return;
done:
/* toss transfer, we're done early */
biodone(bp);
}
/*
* Routine to queue a command to the controller. The unit's
* request is linked into the active list for the controller.
* If the controller is idle, the transfer is started.
*/
static void
wdustart(register struct disk *du)
{
register struct buf *bp, *dp = &wdutab[du->dk_lunit];
int ctrlr = du->dk_ctrlr;
/* unit already active? */
if (dp->b_active)
return;
/* anything to start? */
bp = dp->b_actf;
if (bp == NULL)
return;
/* link onto controller queue */
dp->b_forw = NULL;
if (wdtab[ctrlr].b_actf == NULL)
wdtab[ctrlr].b_actf = dp;
else
wdtab[ctrlr].b_actl->b_forw = dp;
wdtab[ctrlr].b_actl = dp;
/* mark the drive unit as busy */
dp->b_active = 1;
}
/*
* Controller startup routine. This does the calculation, and starts
* a single-sector read or write operation. Called to start a transfer,
* or from the interrupt routine to continue a multi-sector transfer.
* RESTRICTIONS:
* 1. The transfer length must be an exact multiple of the sector size.
*/
static void
wdstart(int ctrlr)
{
register struct disk *du; /* disk unit for IO */
register struct buf *bp;
struct disklabel *lp;
struct buf *dp;
register struct bt_bad *bt_ptr;
long blknum, cylin, head, sector;
long secpertrk, secpercyl, addr;
int lunit, wdc;
loop:
/* is there a drive for the controller to do a transfer with? */
dp = wdtab[ctrlr].b_actf;
if (dp == NULL)
return;
/* is there a transfer to this drive? */
/* If so, link it on the controller's queue */
bp = dp->b_actf;
if (bp == NULL) {
wdtab[ctrlr].b_actf = dp->b_forw;
goto loop;
}
/* obtain controller and drive information */
lunit = wdunit(bp->b_dev);
du = wddrives[lunit];
wdc = du->dk_port;
/* if not really a transfer, do control operations specially */
if (du->dk_state < OPEN) {
if (du->dk_state != WANTOPEN)
printf("wd%d: wdstart: weird dk_state %d\n",
du->dk_lunit, du->dk_state);
if (wdcontrol(bp) != 0)
printf("wd%d: wdstart: wdcontrol returned nonzero, state = %d\n",
du->dk_lunit, du->dk_state);
return;
}
/* calculate transfer details */
blknum = bp->b_blkno + du->dk_skip;
#ifdef WDDEBUG
if (du->dk_skip == 0)
printf("wd%d: wdstart: %s %d@%d; map ", lunit,
(bp->b_flags & B_READ) ? "read" : "write",
bp->b_bcount, blknum);
else
printf(" %d)%x", du->dk_skip, inb(wdc+wd_altsts));
#endif
addr = (int) bp->b_un.b_addr;
if (du->dk_skip == 0)
du->dk_bc = bp->b_bcount;
lp = &du->dk_dd;
secpertrk = lp->d_nsectors;
secpercyl = lp->d_secpercyl;
if ((du->dk_flags & DKFL_BSDLABEL) != 0 && wdpart(bp->b_dev) != WDRAW)
blknum += lp->d_partitions[wdpart(bp->b_dev)].p_offset;
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
/*
* See if the current block is in the bad block list.
* (If we have one, and not formatting.)
*/
if ((du->dk_flags & (DKFL_SINGLE|DKFL_BADSECT)) /* 19 Aug 92*/
== (DKFL_SINGLE|DKFL_BADSECT))
for (bt_ptr = du->dk_bad.bt_bad; bt_ptr->bt_cyl != 0xffff;
bt_ptr++) {
if (bt_ptr->bt_cyl > cylin)
/* Sorted list, and we passed our cylinder. quit. */
break;
if (bt_ptr->bt_cyl == cylin &&
bt_ptr->bt_trksec == (head << 8) + sector) {
/*
* Found bad block. Calculate new block addr.
* This starts at the end of the disk (skip the
* last track which is used for the bad block list),
* and works backwards to the front of the disk.
*/
#ifdef WDDEBUG
printf("--- badblock code -> Old = %d; ", blknum);
#endif
/*
* XXX the offset of the bad sector table ought
* to be stored in the in-core copy of the table.
*/
#define BAD144_PART 2 /* XXX scattered magic numbers */
#define BSD_PART 0 /* XXX should be 2 but bad144.c uses 0 */
if (lp->d_partitions[BSD_PART].p_offset != 0)
blknum = lp->d_partitions[BAD144_PART].p_offset
+ lp->d_partitions[BAD144_PART].p_size;
else
blknum = lp->d_secperunit;
blknum -= lp->d_nsectors + (bt_ptr - du->dk_bad.bt_bad)
+ 1;
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
#ifdef WDDEBUG
printf("new = %d\n", blknum);
#endif
break;
}
}
wdtab[ctrlr].b_active = 1; /* mark controller active */
/* if starting a multisector transfer, or doing single transfers */
if (du->dk_skip == 0 || (du->dk_flags & DKFL_SINGLE)) {
int command;
u_int count;
if (wdtab[ctrlr].b_errcnt && (bp->b_flags & B_READ) == 0)
du->dk_bc += DEV_BSIZE;
#ifdef B_FORMAT
if (bp->b_flags & B_FORMAT) {
command = WDCC_FORMAT;
count = lp->d_nsectors;
sector = lp->d_gap3 - 1; /* + 1 later */
} else
#endif
{
if (du->dk_flags & DKFL_SINGLE)
count = 1;
else
count = howmany(du->dk_bc, DEV_BSIZE);
command = (bp->b_flags & B_READ) ? WDCC_READ : WDCC_WRITE;
}
/*
* XXX this loop may never terminate. The code to handle
* counting down of retries and eventually failing the i/o is
* in wdintr() and we can't get there from here.
*/
if (wdtest != 0) {
if (--wdtest == 0) {
wdtest = 100;
printf("dummy wdunwedge\n");
wdunwedge(du);
}
}
while (wdcommand(du, cylin, head, sector, count, command) != 0)
{
wderror(bp, du,
"wdstart: timeout waiting to send command");
wdunwedge(du);
}
#ifdef WDDEBUG
printf("sector %d cylin %d head %d addr %x sts %x\n",
sector, cylin, head, addr, inb(wdc+wd_altsts));
#endif
}
/* if this is a read operation, just go away until it's done. */
if (bp->b_flags & B_READ) return;
/* ready to send data? */
if (wdwait(du, WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ) != 0) {
wderror(bp, du, "wdstart: timeout waiting for DRQ");
/*
* XXX what do we do now? If we've just issued the command,
* then we can treat this failure the same as a command
* failure. But if we are continuing a multi-sector write,
* the command was issued ages ago, so we can't simply
* restart it.
*
* XXX we waste a lot of time unnecessarily translating
* block numbers to cylin/head/sector for continued i/o's.
*/
}
/* then send it! */
outsw (wdc + wd_data, (caddr_t)addr + du->dk_skip * DEV_BSIZE,
DEV_BSIZE/sizeof(short));
du->dk_bc -= DEV_BSIZE;
}
/* Interrupt routine for the controller. Acknowledge the interrupt, check for
* errors on the current operation, mark it done if necessary, and start
* the next request. Also check for a partially done transfer, and
* continue with the next chunk if so.
*/
void
wdintr(int unit)
{
register struct disk *du;
register struct buf *bp, *dp;
int wdc;
if (!wdtab[unit].b_active) {
printf("wdc%d: extra interrupt\n", unit);
return;
}
dp = wdtab[unit].b_actf;
bp = dp->b_actf;
du = wddrives[wdunit(bp->b_dev)];
wdc = du->dk_port;
if (wdwait(du, 0) < 0) {
wderror(bp, du, "wdintr: timeout waiting for status");
du->dk_status |= WDCS_ERR; /* XXX */
}
/* is it not a transfer, but a control operation? */
if (du->dk_state < OPEN) {
wdtab[unit].b_active = 0;
if (wdcontrol(bp))
wdstart(unit);
return;
}
/* have we an error? */
if (du->dk_status & (WDCS_ERR | WDCS_ECCCOR)) {
oops:
#ifdef WDDEBUG
wderror(bp, du, "wdintr");
#endif
if((du->dk_flags & DKFL_SINGLE) == 0) {
du->dk_flags |= DKFL_ERROR;
goto outt;
}
#ifdef B_FORMAT
if (bp->b_flags & B_FORMAT) {
bp->b_error = EIO; /* 17 Sep 92*/
bp->b_flags |= B_ERROR;
goto done;
}
#endif
/* error or error correction? */
if (du->dk_status & WDCS_ERR) {
if (++wdtab[unit].b_errcnt < RETRIES) {
wdtab[unit].b_active = 0;
} else {
wderror(bp, du, "hard error");
bp->b_error = EIO; /* 17 Sep 92*/
bp->b_flags |= B_ERROR; /* flag the error */
}
} else
wderror(bp, du, "soft ecc");
}
/*
* If this was a successful read operation, fetch the data.
*/
if (((bp->b_flags & (B_READ | B_ERROR)) == B_READ) && wdtab[unit].b_active) {
int chk, dummy;
chk = min(DEV_BSIZE / sizeof(short), du->dk_bc / sizeof(short));
/* ready to receive data? */
if ((du->dk_status & (WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ))
!= (WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ))
wderror(bp, du, "wdintr: read intr arrived early");
if (wdwait(du, WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ) != 0) {
wderror(bp, du, "wdintr: read error detected late");
goto oops;
}
/* suck in data */
insw (wdc+wd_data,
(caddr_t)bp->b_un.b_addr + du->dk_skip * DEV_BSIZE, chk);
du->dk_bc -= chk * sizeof(short);
/* for obselete fractional sector reads */
while (chk++ < 256) insw (wdc + wd_data, (caddr_t)&dummy, 1);
}
wdxfer[du->dk_lunit]++;
outt:
if (wdtab[unit].b_active) {
if ((bp->b_flags & B_ERROR) == 0) {
du->dk_skip++; /* Add to successful sectors. */
if (wdtab[unit].b_errcnt)
wderror(bp, du, "soft error");
wdtab[unit].b_errcnt = 0;
/* see if more to transfer */
if (du->dk_bc > 0 && (du->dk_flags & DKFL_ERROR) == 0) {
wdtab[unit].b_active = 0;
wdstart(unit);
return; /* next chunk is started */
} else if ((du->dk_flags & (DKFL_SINGLE|DKFL_ERROR))
== DKFL_ERROR) {
du->dk_skip = 0;
du->dk_flags &= ~DKFL_ERROR;
du->dk_flags |= DKFL_SINGLE;
wdtab[unit].b_active = 0;
wdstart(unit);
return; /* redo xfer sector by sector */
}
}
#ifdef B_FORMAT
done: ;
#endif
/* done with this transfer, with or without error */
du->dk_flags &= ~DKFL_SINGLE;
wdtab[unit].b_actf = dp->b_forw;
wdtab[unit].b_errcnt = 0;
du->dk_skip = 0;
dp->b_active = 0;
dp->b_actf = bp->av_forw;
dp->b_errcnt = 0;
bp->b_resid = 0;
biodone(bp);
}
/* controller idle */
wdtab[unit].b_active = 0;
/* anything more on drive queue? */
if (dp->b_actf)
wdustart(du);
/* anything more for controller to do? */
if (wdtab[unit].b_actf)
wdstart(unit);
}
/*
* Initialize a drive.
*/
int
wdopen(dev_t dev, int flags, int fmt, struct proc *p)
{
register unsigned int lunit;
register struct disk *du;
int part = wdpart(dev), mask = 1 << part;
struct partition *pp;
char *msg;
struct disklabel save_label;
lunit = wdunit(dev);
if (lunit >= NWD) return (ENXIO) ;
du = wddrives[lunit];
if (du == 0) return (ENXIO) ;
while (du->dk_flags & DKFL_LABELLING)
tsleep((caddr_t)&du->dk_flags, PZERO - 1, "wdopen", 1);
if ((du->dk_flags & DKFL_BSDLABEL) == 0) {
/*
* wdtab[ctrlr].b_active != 0 implies wdutab[lunit].b_actf == NULL (?)
* so the following guards most things (until the next i/o).
* It doesn't guard against a new i/o starting and being
* affected by the label being changed. Sigh.
*/
wdsleep(du->dk_ctrlr, "wdopn1");
du->dk_flags |= DKFL_LABELLING | DKFL_WRITEPROT;
du->dk_state = WANTOPEN;
wdutab[lunit].b_actf = NULL;
/*
* Read label using WDRAW partition.
*
* If the drive has an MBR, then the current geometry (from
* wdgetctlr()) is used to read it; then the BIOS/DOS
* geometry is inferred and used to read the label off the
* 'c' partition. Otherwise the label is read using the
* current geometry. The label gives the final geometry.
* If bad sector handling is enabled, then this geometry
* is used to read the bad sector table. The geometry
* changes occur inside readdisklabel() and are propagated
* to the driver by resetting the state machine.
*/
save_label = du->dk_dd;
#define WDSTRATEGY ((void (*)(struct buf *)) wdstrategy) /* XXX */
msg = readdisklabel(makewddev(major(dev), lunit, WDRAW),
WDSTRATEGY, &du->dk_dd,
du->dk_dospartitions, &du->dk_bad,
(struct buf **)NULL);
du->dk_flags &= ~DKFL_LABELLING;
if (msg != NULL) {
du->dk_dd = save_label;
log(LOG_WARNING, "wd%d: cannot find label (%s)\n",
lunit, msg);
if (part != WDRAW)
return (EINVAL); /* XXX needs translation */
} else {
du->dk_flags |= DKFL_BSDLABEL;
du->dk_flags &= ~DKFL_WRITEPROT;
if (du->dk_dd.d_flags & D_BADSECT)
du->dk_flags |= DKFL_BADSECT;
}
/* Pick up changes made by readdisklabel(). */
wdsleep(du->dk_ctrlr, "wdopn2");
du->dk_state = WANTOPEN;
}
/*
* Warn if a partion is opened
* that overlaps another partition which is open
* unless one is the "raw" partition (whole disk).
*/
if ((du->dk_openpart & mask) == 0 /*&& part != RAWPART*/ && part != WDRAW) {
int start, end;
pp = &du->dk_dd.d_partitions[part];
start = pp->p_offset;
end = pp->p_offset + pp->p_size;
for (pp = du->dk_dd.d_partitions;
pp < &du->dk_dd.d_partitions[du->dk_dd.d_npartitions];
pp++) {
if (pp->p_offset + pp->p_size <= start ||
pp->p_offset >= end)
continue;
if (pp - du->dk_dd.d_partitions == WDRAW)
continue;
if (du->dk_openpart & (1 << (pp -
du->dk_dd.d_partitions)))
log(LOG_WARNING,
"wd%d%c: overlaps open partition (%c)\n",
lunit, part + 'a',
pp - du->dk_dd.d_partitions + 'a');
}
}
if (part >= du->dk_dd.d_npartitions && part != WDRAW)
return (ENXIO);
/* insure only one open at a time */
du->dk_openpart |= mask;
switch (fmt) {
case S_IFCHR:
du->dk_copenpart |= mask;
break;
case S_IFBLK:
du->dk_bopenpart |= mask;
break;
}
return (0);
}
/*
* Implement operations other than read/write.
* Called from wdstart or wdintr during opens and formats.
* Uses finite-state-machine to track progress of operation in progress.
* Returns 0 if operation still in progress, 1 if completed.
*/
static int
wdcontrol(register struct buf *bp)
{
register struct disk *du;
int ctrlr;
du = wddrives[wdunit(bp->b_dev)];
ctrlr = du->dk_ctrlr;
switch (du->dk_state) {
case WANTOPEN:
tryagainrecal:
wdtab[ctrlr].b_active = 1;
if (wdcommand(du, 0, 0, 0, 0, WDCC_RESTORE | WD_STEP) != 0) {
wderror(bp, du, "wdcontrol: wdcommand failed");
goto maybe_retry;
}
du->dk_state = RECAL;
return(0);
case RECAL:
if (du->dk_status & WDCS_ERR || wdsetctlr(du) != 0) {
wderror(bp, du, "wdcontrol: recal failed");
maybe_retry:
if (du->dk_status & WDCS_ERR)
wdunwedge(du);
if (++wdtab[ctrlr].b_errcnt < RETRIES) {
du->dk_state = WANTOPEN;
goto tryagainrecal;
}
bp->b_error = ENXIO; /* XXX needs translation */
bp->b_flags |= B_ERROR;
return(1);
}
wdtab[ctrlr].b_errcnt = 0;
du->dk_state = OPEN;
/*
* The rest of the initialization can be done
* by normal means.
*/
return(1);
}
panic("wdcontrol");
return (1);
}
/*
* Wait uninterruptibly until controller is not busy, then send it a command.
* The wait usually terminates immediately because we waited for the previous
* command to terminate.
*/
static int
wdcommand(struct disk *du, u_int cylinder, u_int head, u_int sector,
u_int count, u_int command)
{
u_int wdc;
if (wdwait(du, 0) < 0)
return (1);
wdc = du->dk_port;
outb(wdc + wd_precomp, du->dk_dd.d_precompcyl / 4);
outb(wdc + wd_cyl_lo, cylinder);
outb(wdc + wd_cyl_hi, cylinder >> 8);
outb(wdc + wd_sdh, WDSD_IBM | (du->dk_unit << 4) | (head & 0x0f));
DELAY(10); /* XXX give drive time to see change */
if((command != WDCC_DIAGNOSE) && (command != WDCC_IDC)) {
if (wdwait(du, WDCS_READY) < 0) {
return(1);
}
}
else {
if (wdwait(du, 0) < 0) {
return(1);
}
}
outb(wdc + wd_sector, sector + 1);
outb(wdc + wd_seccnt, count);
outb(du->dk_port + wd_command, command);
return (0);
}
/*
* issue IDC to drive to tell it just what geometry it is to be.
*/
static int
wdsetctlr(struct disk *du)
{
#ifdef WDDEBUG
printf("wd(%d,%d): wdsetctlr C %lu H %lu S %lu\n", du->dk_ctrlr, du->dk_unit,
du->dk_dd.d_ncylinders, du->dk_dd.d_ntracks,
du->dk_dd.d_nsectors);
#endif
if (wdcommand(du, du->dk_dd.d_ncylinders, du->dk_dd.d_ntracks - 1, 0,
du->dk_dd.d_nsectors, WDCC_IDC) != 0
|| wdwait(du, WDCS_READY) != 0) {
wderror((struct buf *)NULL, du, "wdsetctlr failed");
return (1);
}
return (0);
}
/*
* Wait until driver is inactive, then set up controller.
*/
static int
wdwsetctlr(struct disk *du)
{
int stat;
int x;
wdsleep(du->dk_ctrlr, "wdwset");
x = splbio();
stat = wdsetctlr(du);
splx(x);
return (stat);
}
/*
* issue READP to drive to ask it what it is.
*/
static int
wdgetctlr(struct disk *du) {
int i;
char tb[DEV_BSIZE];
struct wdparams *wp;
if (wdcommand(du, 0, 0, 0, 0, WDCC_READP) != 0
|| wdwait(du, WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ) != 0) {
#ifndef MFM
/* Old drives don't support WDCC_READP. Try a seek to 0. */
if (wdcommand(du, 0, 0, 0, 0, WDCC_RESTORE | WD_STEP) != 0
|| wdwait(du, WDCS_READY | WDCS_SEEKCMPLT) != 0)
return (1);
#else /* IDE */
/*
* Some IDE drives return trash if there is not a unit 1
* out there, need to make sure that it is READY and not BUSY
* before you assume it is there !
*/
outb(du->dk_port+wd_sdh, WDSD_IBM | (du->dk_unit<<4));
DELAY(5000);
if ((inb(du->dk_port+wd_status) & (WDCS_READY|WDCS_BUSY)) !=
WDCS_READY) {
return (1);
}
#endif /* MFM */
/* Fake minimal drive geometry for reading the MBR or label. */
du->dk_dd.d_secsize = DEV_BSIZE;
du->dk_dd.d_nsectors = 17;
du->dk_dd.d_ntracks = 1;
du->dk_dd.d_ncylinders = 1;
du->dk_dd.d_secpercyl = 17;
/*
* Fake some more of the label for printing by disklabel(1)
* in case there is no real label.
*/
du->dk_dd.d_type = DTYPE_ST506;
du->dk_dd.d_subtype |= DSTYPE_GEOMETRY;
strncpy(du->dk_dd.d_typename, "Fake geometry",
sizeof du->dk_dd.d_typename);
/* Fake the model name for printing by wdattach(). */
strncpy(du->dk_params.wdp_model, "Unknown Type",
sizeof du->dk_params.wdp_model);
return (0);
}
/* obtain parameters */
wp = &du->dk_params;
insw(du->dk_port + wd_data, tb, sizeof(tb)/sizeof(short));
bcopy(tb, wp, sizeof(struct wdparams));
/* shuffle string byte order */
for (i=0; i < sizeof(wp->wdp_model) ;i+=2) {
u_short *p;
p = (u_short *) (wp->wdp_model + i);
*p = ntohs(*p);
}
#ifdef WDDEBUG
printf(
"\nwdgetctlr wd(%d,%d): gc %x cyl %d trk %d sec %d type %d sz %d model %s\n",
du->dk_ctrlr, du->dk_unit, wp->wdp_config,
wp->wdp_fixedcyl + wp->wdp_removcyl, wp->wdp_heads,
wp->wdp_sectors, wp->wdp_cntype, wp->wdp_cnsbsz,
wp->wdp_model);
#endif
/* update disklabel given drive information */
du->dk_dd.d_secsize = DEV_BSIZE;
du->dk_dd.d_ncylinders = wp->wdp_fixedcyl + wp->wdp_removcyl /*+- 1*/;
du->dk_dd.d_ntracks = wp->wdp_heads;
du->dk_dd.d_nsectors = wp->wdp_sectors;
du->dk_dd.d_secpercyl = du->dk_dd.d_ntracks * du->dk_dd.d_nsectors;
/* dubious ... */
bcopy("ESDI/IDE", du->dk_dd.d_typename, 9);
bcopy(wp->wdp_model+20, du->dk_dd.d_packname, 14-1);
/* better ... */
du->dk_dd.d_type = DTYPE_ESDI;
du->dk_dd.d_subtype |= DSTYPE_GEOMETRY;
return (0);
}
/* ARGSUSED */
int
wdclose(dev_t dev, int flags, int fmt)
{
register struct disk *du;
int part = wdpart(dev), mask = 1 << part;
du = wddrives[wdunit(dev)];
/* insure only one open at a time */
du->dk_openpart &= ~mask;
switch (fmt) {
case S_IFCHR:
du->dk_copenpart &= ~mask;
break;
case S_IFBLK:
du->dk_bopenpart &= ~mask;
break;
}
return(0);
}
int
wdioctl(dev_t dev, int cmd, caddr_t addr, int flag)
{
int lunit = wdunit(dev);
register struct disk *du;
int error = 0;
#ifdef notyet
struct uio auio;
struct iovec aiov;
#endif
du = wddrives[lunit];
switch (cmd) {
case DIOCSBAD:
if ((flag & FWRITE) == 0)
error = EBADF;
else
du->dk_bad = *(struct dkbad *)addr;
break;
case DIOCGDINFO:
*(struct disklabel *)addr = du->dk_dd;
break;
case DIOCGPART:
((struct partinfo *)addr)->disklab = &du->dk_dd;
((struct partinfo *)addr)->part =
&du->dk_dd.d_partitions[wdpart(dev)];
break;
case DIOCSDINFO:
if ((flag & FWRITE) == 0)
error = EBADF;
else
error = setdisklabel(&du->dk_dd,
(struct disklabel *)addr,
/* du->dk_flags & DKFL_BSDLABEL) ? du->dk_openpart : */0,
du->dk_dospartitions);
if (error == 0) {
du->dk_flags |= DKFL_BSDLABEL;
wdwsetctlr(du); /* XXX - check */
}
break;
case DIOCWLABEL:
du->dk_flags &= ~DKFL_WRITEPROT;
if ((flag & FWRITE) == 0)
error = EBADF;
else
du->dk_wlabel = *(int *)addr;
break;
case DIOCWDINFO:
du->dk_flags &= ~DKFL_WRITEPROT;
if ((flag & FWRITE) == 0)
error = EBADF;
else if ((error = setdisklabel(&du->dk_dd, (struct disklabel *)addr,
/*du->dk_flags & DKFL_BSDLABEL) ? du->dk_openpart :*/ 0,
du->dk_dospartitions)) == 0) {
int wlab;
du->dk_flags |= DKFL_BSDLABEL;
wdwsetctlr(du); /* XXX - check */
/* simulate opening partition 0 so write succeeds */
du->dk_openpart |= (1 << 0); /* XXX */
wlab = du->dk_wlabel;
du->dk_wlabel = 1;
error = writedisklabel(dev, WDSTRATEGY,
&du->dk_dd, du->dk_dospartitions);
du->dk_openpart = du->dk_copenpart | du->dk_bopenpart;
du->dk_wlabel = wlab;
}
break;
#ifdef notyet
case DIOCGDINFOP:
*(struct disklabel **)addr = &(du->dk_dd);
break;
case DIOCWFORMAT:
if ((flag & FWRITE) == 0)
error = EBADF;
else {
register struct format_op *fop;
fop = (struct format_op *)addr;
aiov.iov_base = fop->df_buf;
aiov.iov_len = fop->df_count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_resid = fop->df_count;
auio.uio_segflg = 0;
auio.uio_offset =
fop->df_startblk * du->dk_dd.d_secsize;
error = physio(wdformat, &rwdbuf[lunit], 0, dev, B_WRITE,
minphys, &auio);
fop->df_count -= auio.uio_resid;
fop->df_reg[0] = du->dk_status;
fop->df_reg[1] = du->dk_error;
}
break;
#endif
default:
error = ENOTTY;
break;
}
return (error);
}
#ifdef B_FORMAT
int
wdformat(struct buf *bp)
{
bp->b_flags |= B_FORMAT;
return (wdstrategy(bp));
}
#endif
int
wdsize(dev_t dev)
{
int lunit = wdunit(dev), part = wdpart(dev), val;
struct disk *du;
if (lunit >= NWD) /* 31 Jul 92*/
return(-1);
du = wddrives[lunit];
val = 0;
if (du == 0 || du->dk_state == CLOSED)
val = wdopen (makewddev(major(dev), lunit, WDRAW), FREAD, S_IFBLK, 0);
if (du == 0 || val != 0 || du->dk_flags & DKFL_WRITEPROT)
return (-1);
return((int)du->dk_dd.d_partitions[part].p_size);
}
extern char *vmmap; /* poor name! */
int
wddump(dev_t dev) /* dump core after a system crash */
{
register struct disk *du; /* disk unit to do the IO */
#ifdef notyet
register struct bt_bad *bt_ptr;
#endif
long num; /* number of sectors to write */
int ctrlr, lunit, part, wdc;
long blkoff, blknum;
#ifdef notdef
long blkcnt;
#endif
long cylin, head, sector;
long secpertrk, secpercyl, nblocks, i;
char *addr;
extern int Maxmem;
static wddoingadump = 0 ;
extern caddr_t CADDR1;
addr = (char *) 0; /* starting address */
/* toss any characters present prior to dump */
while (sgetc(1))
;
/* size of memory to dump */
num = Maxmem;
lunit = wdunit(dev); /* eventually support floppies? */
part = wdpart(dev); /* file system */
/* check for acceptable drive number */
if (lunit >= NWD) return(ENXIO); /* 31 Jul 92*/
du = wddrives[lunit];
if (du == 0) return(ENXIO);
/* was it ever initialized ? */
if (du->dk_state < OPEN) return (ENXIO) ;
if (du->dk_flags & DKFL_WRITEPROT) return(ENXIO);
wdc = du->dk_port;
ctrlr = du->dk_ctrlr;
/* Convert to disk sectors */
num = (u_long) num * NBPG / du->dk_dd.d_secsize;
/* check if controller active */
/*if (wdtab[ctrlr].b_active) return(EFAULT); */
if (wddoingadump) return(EFAULT);
secpertrk = du->dk_dd.d_nsectors;
secpercyl = du->dk_dd.d_secpercyl;
nblocks = du->dk_dd.d_partitions[part].p_size;
blkoff = du->dk_dd.d_partitions[part].p_offset;
/*pg("xunit %x, nblocks %d, dumplo %d num %d\n", part,nblocks,dumplo,num);*/
/* check transfer bounds against partition size */
if ((dumplo < 0) || ((dumplo + num) > nblocks))
return(EINVAL);
#if 0
wdtab[ctrlr].b_active = 1; /* mark controller active for if we */
/* panic during the dump */
#endif
wddoingadump = 1 ;
i = 100000; /* WHY NOT TIMEOUT */
/* must delay 5us to conform to ATA spec */
DELAY(5);
while ((inb(wdc+wd_status) & WDCS_BUSY) && (i-- > 0)) ;
outb(wdc+wd_sdh, WDSD_IBM | (du->dk_unit << 4));
outb(wdc+wd_command, WDCC_RESTORE | WD_STEP);
/* must delay 5us to conform to ATA spec */
DELAY(5);
while (inb(wdc+wd_status) & WDCS_BUSY) ;
/* some compaq controllers require this ... */
wdsetctlr(du);
blknum = dumplo + blkoff;
while (num > 0) {
#ifdef notdef
if (blkcnt > MAXTRANSFER) blkcnt = MAXTRANSFER;
if ((blknum + blkcnt - 1) / secpercyl != blknum / secpercyl)
blkcnt = secpercyl - (blknum % secpercyl);
/* keep transfer within current cylinder */
#endif
pmap_enter(kernel_pmap, (vm_offset_t)CADDR1,
trunc_page(addr), VM_PROT_READ, TRUE);
/* compute disk address */
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
#ifdef notyet
/*
* See if the current block is in the bad block list.
* (If we have one.)
*/
for (bt_ptr = du->dk_bad.bt_bad;
bt_ptr->bt_cyl != -1; bt_ptr++) {
if (bt_ptr->bt_cyl > cylin)
/* Sorted list, and we passed our cylinder.
quit. */
break;
if (bt_ptr->bt_cyl == cylin &&
bt_ptr->bt_trksec == (head << 8) + sector) {
/*
* Found bad block. Calculate new block addr.
* This starts at the end of the disk (skip the
* last track which is used for the bad block list),
* and works backwards to the front of the disk.
*/
/* XXX as usual */
if (lp->d_partitions[BSD_PART].p_offset != 0)
blknum = lp->d_partitions[BAD144_PART]
.p_offset
+ lp->d_partitions[BAD144_PART]
.p_size;
else
blknum = lp->d_secperunit;
blknum -= du->dk_dd.d_nsectors
+ (bt_ptr - du->dk_bad.bt_bad) + 1;
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
break;
}
}
#endif
sector++; /* origin 1 */
/* select drive. */
outb(wdc+wd_sdh, WDSD_IBM | (du->dk_unit<<4) | (head & 0xf));
while ((inb(wdc+wd_status) & WDCS_READY) == 0) ;
/* transfer some blocks */
outb(wdc+wd_sector, sector);
outb(wdc+wd_seccnt,1);
outb(wdc+wd_cyl_lo, cylin);
outb(wdc+wd_cyl_hi, cylin >> 8);
#ifdef notdef
/* lets just talk about this first...*/
pg ("sdh 0%o sector %d cyl %d addr 0x%x",
inb(wdc+wd_sdh), inb(wdc+wd_sector),
inb(wdc+wd_cyl_hi)*256+inb(wdc+wd_cyl_lo), addr) ;
#endif
outb(wdc+wd_command, WDCC_WRITE);
/* Ready to send data? */
while ((inb(wdc+wd_status) & WDCS_DRQ) == 0) ;
if (inb(wdc+wd_status) & WDCS_ERR) return(EIO) ;
outsw (wdc+wd_data, CADDR1+((int)addr&(NBPG-1)), 256);
if (inb(wdc+wd_status) & WDCS_ERR) return(EIO) ;
/* Check data request (should be done) */
if (inb(wdc+wd_status) & WDCS_DRQ) return(EIO) ;
/* wait for completion */
/* must delay 5us to conform to ATA spec */
DELAY(5);
for ( i = WDCTIMEOUT ; inb(wdc+wd_status) & WDCS_BUSY ; i--) {
if (i < 0) return (EIO) ;
}
/* error check the xfer */
if (inb(wdc+wd_status) & WDCS_ERR) return(EIO) ;
if ((unsigned)addr % (1024*1024) == 0) printf("%ld ", num/2048);
/* update block count */
num--;
blknum++ ;
(int) addr += 512;
/* operator aborting dump? */
if (sgetc(1))
return(EINTR);
}
return(0);
}
static void
wderror(struct buf *bp, struct disk *du, char *mesg)
{
if (bp == NULL)
printf("wd%d: %s:", du->dk_lunit, mesg);
else
diskerr(bp, "wd", mesg, LOG_PRINTF, du->dk_skip, &du->dk_dd);
printf(" status %b error %b\n",
du->dk_status, WDCS_BITS, du->dk_error, WDERR_BITS);
}
/*
* Reset the controller.
*/
static int
wdreset(struct disk *du)
{
int wdc;
wdc = du->dk_port;
(void)wdwait(du, 0);
outb(wdc + wd_ctlr, WDCTL_IDS | WDCTL_RST);
DELAY(10 * 1000);
outb(wdc + wd_ctlr, WDCTL_IDS);
if (wdwait(du, WDCS_READY | WDCS_SEEKCMPLT) != 0
|| (du->dk_error = inb(wdc + wd_error)) != 0x01)
return (1);
outb(wdc + wd_ctlr, WDCTL_4BIT);
return (0);
}
/*
* Sleep until driver is inactive.
* This is used only for avoiding rare race conditions, so it is unimportant
* that the sleep may be far too short or too long.
*/
static void
wdsleep(int ctrlr, char *wmesg)
{
while (wdtab[ctrlr].b_active)
tsleep((caddr_t)&wdtab[ctrlr].b_active, PZERO - 1, wmesg, 1);
}
/*
* Reset the controller after it has become wedged. This is different from
* wdreset() so that wdreset() can be used in the probe and so that this
* can restore the geometry .
*/
static int
wdunwedge(struct disk *du)
{
struct disk *du1;
int lunit;
/* Schedule other drives for recalibration. */
for (lunit = 0; lunit < NWD; lunit++)
if ((du1 = wddrives[lunit]) != NULL && du1 != du
&& du1->dk_ctrlr == du->dk_ctrlr
&& du1->dk_state > WANTOPEN)
du1->dk_state = WANTOPEN;
DELAY(RECOVERYTIME);
if (wdreset(du) == 0) {
/*
* XXX - recalibrate current drive now because some callers
* aren't prepared to have its state change.
*/
if (wdcommand(du, 0, 0, 0, 0, WDCC_RESTORE | WD_STEP) == 0
&& wdwait(du, WDCS_READY | WDCS_SEEKCMPLT) == 0
&& wdsetctlr(du) == 0)
return (0);
}
wderror((struct buf *)NULL, du, "wdunwedge failed");
return (1);
}
/*
* Wait uninterruptibly until controller is not busy and either certain
* status bits are set or an error has occurred.
* The wait is usually short unless it is for the controller to process
* an entire critical command.
* Return 1 for (possibly stale) controller errors, -1 for timeout errors,
* or 0 for no errors.
* Return controller status in du->dk_status and, if there was a controller
* error, return the error code in du->dk_error.
*/
static int min_retries[NWDC];
static int
wdwait(struct disk *du, u_char bits_wanted)
{
int retries;
int wdc;
int ctrlr = du->dk_ctrlr;
u_char status;
#define POLLING 1000
#define TIMEOUT 2000 /* WDCC_DIAGNOSE can take > 300 msec */
wdc = du->dk_port;
retries = POLLING + TIMEOUT;
do {
if (min_retries[ctrlr] > retries || min_retries[ctrlr] == 0)
min_retries[ctrlr] = retries;
/* must delay 5us to conform to ATA spec */
DELAY(5);
du->dk_status = status = inb(wdc + wd_status);
if (!(status & WDCS_BUSY)) {
if (status & WDCS_ERR) {
du->dk_error = inb(wdc + wd_error);
/*
* We once returned here. This is wrong
* because the error bit is apparently only
* valid after the controller has interrupted
* (e.g., the error bit is stale when we wait
* for DRQ for writes). So we can't depend
* on the error bit at all when polling for
* command completion.
*/
}
if ((status & bits_wanted) == bits_wanted)
return (status & WDCS_ERR);
}
if (retries < TIMEOUT)
/*
* Switch to a polling rate of about 1 KHz so that
* the timeout is almost machine-independent. The
* controller is taking a long time to respond, so
* an extra msec won't matter.
*/
DELAY(1000);
} while (--retries != 0);
return (-1);
}
#endif /* NWDC > 0 */
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.