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conservative fix for increasing FIN
[unix-history] / usr / src / sys / vax / stand / up.c
/*
* Copyright (c) 1982 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)up.c 6.5 (Berkeley) %G%
*/
/*
* UNIBUS peripheral standalone driver
* with ECC correction and bad block forwarding.
* Also supports header operation and write
* check for data and/or header.
*/
#include "../h/param.h"
#include "../h/inode.h"
#include "../h/fs.h"
#include "../h/dkbad.h"
#include "../h/vmmac.h"
#include "../vax/pte.h"
#include "../vaxuba/upreg.h"
#include "../vaxuba/ubareg.h"
#include "saio.h"
#include "savax.h"
#define RETRIES 27
#define MAXBADDESC 126 /* max number of bad sectors recorded */
#define SECTSIZ 512 /* sector size in bytes */
#define HDRSIZ 4 /* number of bytes in sector header */
u_short ubastd[] = { 0776700 };
extern struct st upst[];
struct dkbad upbad[MAXNUBA*8]; /* bad sector table */
int sectsiz; /* real sector size */
struct up_softc {
char gottype;
char type;
char debug;
# define UPF_BSEDEBUG 01 /* debugging bad sector forwarding */
# define UPF_ECCDEBUG 02 /* debugging ecc correction */
int retries;
int ecclim;
} up_softc[MAXNUBA * 8];
u_char up_offset[16] = {
UPOF_P400, UPOF_M400, UPOF_P400, UPOF_M400,
UPOF_P800, UPOF_M800, UPOF_P800, UPOF_M800,
UPOF_P1200, UPOF_M1200, UPOF_P1200, UPOF_M1200,
0, 0, 0, 0
};
upopen(io)
register struct iob *io;
{
register unit = io->i_unit;
register struct updevice *upaddr;
register struct up_softc *sc = &up_softc[unit];
register struct st *st;
if (io->i_boff < 0 || io->i_boff > 7)
_stop("up bad unit");
upaddr = (struct updevice *)ubamem(unit, ubastd[0]);
upaddr->upcs2 = unit % 8;
while ((upaddr->upcs1 & UP_DVA) == 0)
;
if (sc->gottype == 0) {
register int i;
struct iob tio;
sc->retries = RETRIES;
sc->ecclim = 11;
sc->debug = 0;
sc->type = upmaptype(unit, upaddr);
if (sc->type < 0)
_stop("unknown drive type");
st = &upst[sc->type];
if (st->off[io->i_boff] == -1)
_stop("up bad unit");
/*
* Read in the bad sector table.
*/
tio = *io;
tio.i_bn = st->nspc * st->ncyl - st->nsect;
tio.i_ma = (char *)&upbad[tio.i_unit];
tio.i_cc = sizeof (struct dkbad);
tio.i_flgs |= F_RDDATA;
for (i = 0; i < 5; i++) {
if (upstrategy(&tio, READ) == sizeof (struct dkbad))
break;
tio.i_bn += 2;
}
if (i == 5) {
printf("Unable to read bad sector table\n");
for (i = 0; i < MAXBADDESC; i++) {
upbad[unit].bt_bad[i].bt_cyl = -1;
upbad[unit].bt_bad[i].bt_trksec = -1;
}
}
sc->gottype = 1;
}
st = &upst[sc->type];
io->i_boff = st->off[io->i_boff] * st->nspc;
io->i_flgs &= ~F_TYPEMASK;
}
upstrategy(io, func)
register struct iob *io;
{
int cn, tn, sn, o;
register unit = io->i_unit;
daddr_t bn;
int recal, info, waitdry;
register struct updevice *upaddr =
(struct updevice *)ubamem(unit, ubastd[0]);
struct up_softc *sc = &up_softc[unit];
register struct st *st = &upst[sc->type];
int doprintf = 0, error, rv = io->i_cc;
sectsiz = SECTSIZ;
if (io->i_flgs & (F_HDR|F_HCHECK))
sectsiz += HDRSIZ;
upaddr->upcs2 = unit % 8;
if ((upaddr->upds & UPDS_VV) == 0) {
upaddr->upcs1 = UP_DCLR|UP_GO;
upaddr->upcs1 = UP_PRESET|UP_GO;
upaddr->upof = UPOF_FMT22;
}
if ((upaddr->upds & UPDS_DREADY) == 0) {
printf("up%d not ready", unit);
return (-1);
}
info = ubasetup(io, 1);
upaddr->upwc = -io->i_cc / sizeof (short);
recal = 0;
io->i_errcnt = 0;
restart:
error = 0;
o = io->i_cc + (upaddr->upwc * sizeof (short));
upaddr->upba = info + o;
bn = io->i_bn + o / sectsiz;
if (doprintf && sc->debug & (UPF_ECCDEBUG|UPF_BSEDEBUG))
printf("wc=%d o=%d i_bn=%d bn=%d\n",
upaddr->upwc, o, io->i_bn, bn);
while((upaddr->upds & UPDS_DRY) == 0)
;
if (upstart(io, bn) != 0) {
rv = -1;
goto done;
}
do {
DELAY(25);
} while ((upaddr->upcs1 & UP_RDY) == 0);
/*
* If transfer has completed, free UNIBUS
* resources and return transfer size.
*/
if ((upaddr->upds&UPDS_ERR) == 0 && (upaddr->upcs1&UP_TRE) == 0)
goto done;
bn = io->i_bn +
(io->i_cc + upaddr->upwc * sizeof (short)) / sectsiz;
if (upaddr->uper1 & (UPER1_DCK|UPER1_ECH))
bn--;
cn = bn/st->nspc;
sn = bn%st->nspc;
tn = sn/st->nsect;
sn = sn%st->nsect;
if (sc->debug & (UPF_ECCDEBUG|UPF_BSEDEBUG)) {
printf("up error: sn%d (cyl,trk,sec)=(%d,%d,%d) ",
bn, cn, tn, sn);
printf("cs2=%b er1=%b er2=%b wc=%d\n",
upaddr->upcs2, UPCS2_BITS, upaddr->uper1,
UPER1_BITS, upaddr->uper2, UPER2_BITS, upaddr->upwc);
}
waitdry = 0;
while ((upaddr->upds&UPDS_DRY) == 0 && ++waitdry < sectsiz)
DELAY(5);
if (upaddr->uper1&UPER1_WLE) {
/*
* Give up on write locked devices immediately.
*/
printf("up%d: write locked\n", unit);
rv = -1;
goto done;
}
if (upaddr->uper2 & UPER2_BSE) {
if ((io->i_flgs&F_NBSF) == 0 && upecc(io, BSE) == 0)
goto success;
error = EBSE;
goto hard;
}
/*
* ECC error. If a soft error, correct it;
* if correction is too large, no more retries.
*/
if ((upaddr->uper1 & (UPER1_DCK|UPER1_ECH|UPER1_HCRC)) == UPER1_DCK) {
if (upecc(io, ECC) == 0)
goto success;
error = EECC;
goto hard;
}
/*
* If the error is a header CRC,
* check if a replacement sector exists in
* the bad sector table.
*/
if ((upaddr->uper1&UPER1_HCRC) && (io->i_flgs&F_NBSF) == 0 &&
upecc(io, BSE) == 0)
goto success;
if (++io->i_errcnt > sc->retries) {
/*
* After 28 retries (16 without offset, and
* 12 with offset positioning) give up.
*/
hard:
if (error == 0) {
error = EHER;
if (upaddr->upcs2 & UPCS2_WCE)
error = EWCK;
}
printf("up error: sn%d (cyl,trk,sec)=(%d,%d,%d) ",
bn, cn, tn, sn);
printf("cs2=%b er1=%b er2=%b\n",
upaddr->upcs2, UPCS2_BITS, upaddr->uper1,
UPER1_BITS, upaddr->uper2, UPER2_BITS);
upaddr->upcs1 = UP_TRE|UP_DCLR|UP_GO;
io->i_errblk = bn;
if (io->i_errcnt >= 16) {
upaddr->upof = UPOF_FMT22;
upaddr->upcs1 = UP_RTC|UP_GO;
while ((upaddr->upds&UPDS_DRY) == 0)
DELAY(25);
}
rv = -1;
goto done;
}
/*
* Clear drive error and, every eight attempts,
* (starting with the fourth)
* recalibrate to clear the slate.
*/
upaddr->upcs1 = UP_TRE|UP_DCLR|UP_GO;
if ((io->i_errcnt&07) == 4 ) {
upaddr->upcs1 = UP_RECAL|UP_GO;
while ((upaddr->upds&UPDS_DRY) == 0)
DELAY(25);
upaddr->updc = cn;
upaddr->upcs1 = UP_SEEK|UP_GO;
while ((upaddr->upds&UPDS_DRY) == 0)
DELAY(25);
}
if (io->i_errcnt >= 16 && (func & READ)) {
upaddr->upof = up_offset[io->i_errcnt & 017] | UPOF_FMT22;
upaddr->upcs1 = UP_OFFSET|UP_GO;
while ((upaddr->upds&UPDS_DRY) == 0)
DELAY(25);
}
goto restart;
success:
#define rounddown(x, y) (((x) / (y)) * (y))
upaddr->upwc = rounddown(upaddr->upwc, sectsiz / sizeof (short));
if (upaddr->upwc) {
doprintf++;
goto restart;
}
done:
/*
* Release UNIBUS
*/
ubafree(io, info);
/*
* If we were offset positioning,
* return to centerline.
*/
if (io->i_errcnt >= 16) {
upaddr->upof = UPOF_FMT22;
upaddr->upcs1 = UP_RTC|UP_GO;
while ((upaddr->upds&UPDS_DRY) == 0)
DELAY(25);
}
return (rv);
}
/*
* Correct an ECC error, and restart the
* i/o to complete the transfer (if necessary).
* This is quite complicated because the transfer
* may be going to an odd memory address base and/or
* across a page boundary.
*/
upecc(io, flag)
register struct iob *io;
int flag;
{
register i, unit = io->i_unit;
register struct up_softc *sc = &up_softc[unit];
register struct updevice *up =
(struct updevice *)ubamem(unit, ubastd[0]);
register struct st *st;
caddr_t addr;
int bn, twc, npf, mask, cn, tn, sn;
daddr_t bbn;
/*
* Npf is the number of sectors transferred
* before the sector containing the ECC error;
* bn is the current block number.
*/
twc = up->upwc;
npf = ((twc * sizeof(short)) + io->i_cc) / sectsiz;
if (flag == ECC)
npf--;
if (sc->debug & UPF_ECCDEBUG)
printf("npf=%d mask=0x%x ec1=%d wc=%d\n",
npf, up->upec2, up->upec1, twc);
bn = io->i_bn + npf;
st = &upst[sc->type];
cn = bn/st->nspc;
sn = bn%st->nspc;
tn = sn/st->nsect;
sn = sn%st->nsect;
/*
* ECC correction.
*/
if (flag == ECC) {
int bit, o;
mask = up->upec2;
printf("up%d: soft ecc sn%d\n", unit, bn);
for (i = mask, bit = 0; i; i >>= 1)
if (i & 1)
bit++;
if (bit > sc->ecclim) {
printf("%d-bit error\n", bit);
return (1);
}
/*
* Compute the byte and bit position of
* the error. o is the byte offset in
* the transfer at which the correction
* applied.
*/
i = up->upec1 - 1; /* -1 makes 0 origin */
bit = i & 07;
o = (i & ~07) >> 3;
up->upcs1 = UP_TRE|UP_DCLR|UP_GO;
/*
* Correct while possible bits remain of mask.
* Since mask contains 11 bits, we continue while
* the bit offset is > -11. Also watch out for
* end of this block and the end of the transfer.
*/
while (o < sectsiz && (npf*sectsiz)+o < io->i_cc && bit > -11) {
/*
* addr =
* (base address of transfer) +
* (# sectors transferred before the error) *
* (sector size) +
* (byte offset to incorrect data)
*/
addr = io->i_ma + (npf * sectsiz) + o;
/*
* No data transfer occurs with a write check,
* so don't correct the resident copy of data.
*/
if ((io->i_flgs & (F_CHECK|F_HCHECK)) == 0) {
if (sc->debug & UPF_ECCDEBUG)
printf("addr=0x%x old=0x%x ", addr,
(*addr&0xff));
*addr ^= (mask << bit);
if (sc->debug & UPF_ECCDEBUG)
printf("new=0x%x\n", (*addr&0xff));
}
o++, bit -= 8;
}
return (0);
}
/*
* Bad sector forwarding.
*/
if (flag == BSE) {
/*
* If not in bad sector table,
* indicate a hard error to caller.
*/
up->upcs1 = UP_TRE|UP_DCLR|UP_GO;
if ((bbn = isbad(&upbad[unit], cn, tn, sn)) < 0)
return (1);
bbn = (st->ncyl * st->nspc) - st->nsect - 1 - bbn;
twc = up->upwc + sectsiz;
up->upwc = - (sectsiz / sizeof (short));
if (sc->debug & UPF_BSEDEBUG)
printf("revector sn %d to %d\n", sn, bbn);
/*
* Clear the drive & read the replacement
* sector. If this is in the middle of a
* transfer, then set up the controller
* registers in a normal fashion.
* The UNIBUS address need not be changed.
*/
while ((up->upcs1 & UP_RDY) == 0)
;
if (upstart(io, bbn))
return (1); /* error */
io->i_errcnt = 0; /* success */
do {
DELAY(25);
} while ((up->upcs1 & UP_RDY) == 0) ;
if ((up->upds & UPDS_ERR) || (up->upcs1 & UP_TRE)) {
up->upwc = twc - sectsiz;
return (1);
}
}
if (twc)
up->upwc = twc;
return (0);
}
upstart(io, bn)
register struct iob *io;
daddr_t bn;
{
register struct updevice *upaddr =
(struct updevice *)ubamem(io->i_unit, ubastd[0]);
register struct up_softc *sc = &up_softc[io->i_unit];
register struct st *st = &upst[sc->type];
int sn, tn;
sn = bn%st->nspc;
tn = sn/st->nsect;
sn %= st->nsect;
upaddr->updc = bn/st->nspc;
upaddr->upda = (tn << 8) + sn;
switch (io->i_flgs & F_TYPEMASK) {
case F_RDDATA:
upaddr->upcs1 = UP_RCOM|UP_GO;
break;
case F_WRDATA:
upaddr->upcs1 = UP_WCOM|UP_GO;
break;
case F_HDR|F_RDDATA:
upaddr->upcs1 = UP_RHDR|UP_GO;
break;
case F_HDR|F_WRDATA:
upaddr->upcs1 = UP_WHDR|UP_GO;
break;
case F_CHECK|F_WRDATA:
case F_CHECK|F_RDDATA:
upaddr->upcs1 = UP_WCDATA|UP_GO;
break;
case F_HCHECK|F_WRDATA:
case F_HCHECK|F_RDDATA:
upaddr->upcs1 = UP_WCHDR|UP_GO;
break;
default:
io->i_error = ECMD;
io->i_flgs &= ~F_TYPEMASK;
return (1);
}
return (0);
}
/*ARGSUSED*/
upioctl(io, cmd, arg)
struct iob *io;
int cmd;
caddr_t arg;
{
int unit = io->i_unit;
register struct up_softc *sc = &up_softc[unit];
struct st *st = &upst[sc->type];
switch(cmd) {
case SAIODEBUG:
sc->debug = (int)arg;
break;
case SAIODEVDATA:
*(struct st *)arg = *st;
break;
case SAIOGBADINFO:
*(struct dkbad *)arg = upbad[unit];
break;
case SAIOECCLIM:
sc->ecclim = (int)arg;
break;
case SAIORETRIES:
sc->retries = (int)arg;
break;
default:
return (ECMD);
}
return (0);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.