4.3BSD-Reno/src/sys/vax/mscp.c
/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution is only permitted until one year after the first shipment
* of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
* binary forms are permitted provided that: (1) source distributions retain
* this entire copyright notice and comment, and (2) distributions including
* binaries display the following acknowledgement: This product includes
* software developed by the University of California, Berkeley and its
* contributors'' in the documentation or other materials provided with the
* distribution and in all advertising materials mentioning features or use
* of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)mscp.c 7.4 (Berkeley) 6/28/90
*/
/*
* MSCP generic driver routines
*/
#include "param.h"
#include "buf.h"
#include "errno.h"
#include "dkstat.h"
#include "ioctl.h"
#include "disklabel.h"
#include "syslog.h"
#include "../vaxuba/ubavar.h"
#include "mscp.h"
#include "mscpvar.h"
#define PCMD PSWP /* priority for command packet waits */
/*
* During transfers, mapping info is saved in the buffer's b_resid.
*/
#define b_info b_resid
/*
* Get a command packet. Second argument is true iff we are
* to wait if necessary. Return NULL if none are available and
* we cannot wait.
*/
struct mscp *
mscp_getcp(mi, canwait)
register struct mscp_info *mi;
int canwait;
{
#define mri (&mi->mi_cmd)
register struct mscp *mp;
register int i;
int s = spl5();
again:
/*
* Ensure that we have some command credits, and
* that the next command packet is free.
*/
if (mi->mi_credits <= MSCP_MINCREDITS) {
if (!canwait) {
splx(s);
return (NULL);
}
mi->mi_wantcredits = 1;
sleep((caddr_t) &mi->mi_wantcredits, PCMD);
goto again;
}
i = mri->mri_next;
if (mri->mri_desc[i] & MSCP_OWN) {
if (!canwait) {
splx(s);
return (NULL);
}
mi->mi_wantcmd = 1;
sleep((caddr_t) &mi->mi_wantcmd, PCMD);
goto again;
}
mi->mi_credits--;
mri->mri_desc[i] &= ~MSCP_INT;
mri->mri_next = (mri->mri_next + 1) % mri->mri_size;
splx(s);
mp = &mri->mri_ring[i];
/*
* Initialise some often-zero fields.
* ARE THE LAST TWO NECESSARY IN GENERAL? IT SURE WOULD BE
* NICE IF DEC SOLD DOCUMENTATION FOR THEIR OWN CONTROLLERS.
*/
mp->mscp_msglen = MSCP_MSGLEN;
mp->mscp_flags = 0;
mp->mscp_modifier = 0;
mp->mscp_seq.seq_bytecount = 0;
mp->mscp_seq.seq_buffer = 0;
mp->mscp_seq.seq_mapbase = 0;
/*???*/ mp->mscp_sccc.sccc_errlgfl = 0;
/*???*/ mp->mscp_sccc.sccc_copyspd = 0;
return (mp);
#undef mri
}
#ifdef AVOID_EMULEX_BUG
int mscp_aeb_xor = 0x8000bb80;
#endif
/*
* Do a device go. The driver calls this once it has allocated
* resources for the transfer. Save the resource information in
* bp->b_ubinfo, and finish the MSCP packet.
*
* N.B.: If we were blocked for some time, the drive could have gone
* off line and might still be that way. We should probably handle
* such a case by changing this command into an on line request and
* not dequeuing the transfer after all.
*/
mscp_go(mi, mp, info)
register struct mscp_info *mi;
register struct mscp *mp;
int info;
{
register struct buf *bp, *dp;
/*
* Now is also the time to move the transfer off the
* controller and drive queues, and shuffle the drive
* queue on the controller queue. The idea is to try
* to keep as many drives busy as possible---to deal
* the controller's credits out to the drives in a `fair
* share' arrangement. (To do this fully would be more
* trouble than it is worth, though.)
*/
dp = mi->mi_tab->b_actf;
bp = dp->b_actf;
dp->b_actf = bp->av_forw; /* transfer off drive queue */
mi->mi_tab->b_actf = dp->b_forw;/* drive off ctlr queue */
APPEND(dp, mi->mi_tab, b_forw); /* then back again */
/*
* Move the buffer to the I/O wait queue.
*/
bp->av_back = mi->mi_wtab.av_back;
bp->av_forw = &mi->mi_wtab;
mi->mi_wtab.av_back->av_forw = bp;
mi->mi_wtab.av_back = bp;
/*
* Save the mapping info, finish the command packet, and give
* it to the device. The device's dgo routine should then
* initiate polling.
*/
bp->b_info = info;
#ifdef AVOID_EMULEX_BUG
/*
* The Emulex SC41/MS will occasionally zero the lower half word
* of the command reference number. The upper half word remains
* intact. To keep running, we convert the buffer address into
* a small but nonzero integer that is unique over all pending
* transfers, and store that value in the upper half word. To
* catch occurrances of the bug (so that we can gripe to Emulex),
* we also put a nonzero value in the lower word.
*/
{
register u_int i = mi->mi_nextbp;
do { /* find a free value */
if (mi->mi_bp[i] == 0)
goto found;
i = (i + 1) % AEB_MAX_BP;
} while (i != mi->mi_nextbp);
panic("mscp_go: AEB_MAX_BP too small");
found:
mi->mi_bp[i++] = bp;
mi->mi_nextbp = i % AEB_MAX_BP;
mp->mscp_cmdref = (i << 16) ^ mscp_aeb_xor;
}
#else
mp->mscp_cmdref = (long) bp;
#endif
*mp->mscp_addr |= MSCP_OWN | MSCP_INT;
}
/*
* Handle a response ring transition.
*/
mscp_dorsp(mi)
register struct mscp_info *mi;
{
register struct uba_device *ui;
register struct buf *bp;
register struct mscp *mp;
register int nextrsp;
struct mscp_driver *md = mi->mi_md;
char *ctlrname, *drivename;
int st, error, info;
ctlrname = md->md_mname;
drivename = md->md_dname;
nextrsp = mi->mi_rsp.mri_next;
loop:
if (mi->mi_rsp.mri_desc[nextrsp] & MSCP_OWN) {
/*
* No more responses. Remember the next expected
* response index. Check to see if we have some
* credits back, and wake up sleepers if so.
*/
mi->mi_rsp.mri_next = nextrsp;
if (mi->mi_wantcredits && mi->mi_credits > MSCP_MINCREDITS) {
mi->mi_wantcredits = 0;
wakeup((caddr_t) &mi->mi_wantcredits);
}
return;
}
/*
* Found a response. Update credit information. If there is
* nothing else to do, jump to `done' to get the next response.
*/
mp = &mi->mi_rsp.mri_ring[nextrsp];
mi->mi_credits += MSCP_CREDITS(mp->mscp_msgtc);
switch (MSCP_MSGTYPE(mp->mscp_msgtc)) {
case MSCPT_SEQ:
break;
case MSCPT_DATAGRAM:
(*md->md_dgram)(mi, mp);
goto done;
case MSCPT_CREDITS:
goto done;
case MSCPT_MAINTENANCE:
default:
printf("%s%d: unit %d: unknown message type 0x%x ignored\n",
ctlrname, mi->mi_ctlr, mp->mscp_unit,
MSCP_MSGTYPE(mp->mscp_msgtc));
goto done;
}
/*
* Controllers are allowed to interrupt as any drive, so we
* must check the command before checking for a drive.
*/
if (mp->mscp_opcode == (M_OP_SETCTLRC | M_OP_END)) {
(*md->md_ctlrdone)(mi, mp);
goto done;
}
/*
* Find the drive info. If there is none, and this is an
* available attention response, try configuring a new drive.
*/
if (mp->mscp_unit > md->md_ndpc) {
printf("%s%d: unit %d out of range\n",
ctlrname, mi->mi_ctlr, mp->mscp_unit);
goto done;
}
if ((ui = mi->mi_ip[mp->mscp_unit]) == NULL) {
if ((*md->md_unconf)(mi, mp) != MSCP_DONE) {
printf("%s%d: unit %d not configured, ",
ctlrname, mi->mi_ctlr, mp->mscp_unit);
if (mp->mscp_opcode == M_OP_AVAILATTN)
printf("available attn");
else
printf("stray response op 0x%x status 0x%x",
mp->mscp_opcode, mp->mscp_status);
printf(" ignored\n");
}
goto done;
}
/*
* Handle individual responses.
*/
st = mp->mscp_status & M_ST_MASK;
error = 0;
switch (mp->mscp_opcode) {
case M_OP_END:
/*
* The controller presents a bogus END packet when
* a read/write command is given with an illegal
* block number. This is contrary to the MSCP
* specification (ENDs are to be given only for
* invalid commands), but that is the way of it.
*/
if (st == M_ST_INVALCMD && mp->mscp_cmdref != 0) {
printf("%s%d: bad lbn (%d)?\n", drivename,
ui->ui_unit, mp->mscp_seq.seq_lbn);
error = EIO;
goto rwend;
}
goto unknown;
case M_OP_ONLINE | M_OP_END:
/*
* Finished an ON LINE request. Call the driver to
* find out whether it succeeded. If so, mark it on
* line.
*/
if (ui->ui_flags & UNIT_ONLINE) {
printf("%s%d: duplicate ONLINE ignored\n",
drivename, ui->ui_unit);
break;
}
if ((*md->md_online)(ui, mp) == MSCP_DONE)
ui->ui_flags |= UNIT_ONLINE;
break;
case M_OP_GETUNITST | M_OP_END:
/*
* Got unit status. Call the driver to find out
* whether it succeeded, and if so, mark it.
*/
if ((*md->md_gotstatus)(ui, mp) == MSCP_DONE)
ui->ui_flags |= UNIT_HAVESTATUS;
break;
case M_OP_AVAILATTN:
/*
* The drive went offline and we did not notice.
* Mark it off line now, to force an on line request
* next, so we can make sure it is still the same
* drive.
*
* IF THE UDA DRIVER HAS A COMMAND AWAITING UNIBUS
* RESOURCES, THAT COMMAND MAY GO OUT BEFORE THE ON
* LINE. IS IT WORTH FIXING??
*/
ui->ui_flags &= ~(UNIT_ONLINE | UNIT_HAVESTATUS);
#ifdef notyet
(*md->md_offline)(ui, mp);
#endif
break;
case M_OP_READ | M_OP_END:
case M_OP_WRITE | M_OP_END:
/*
* A transfer finished. Get the buffer, and release its
* map registers via ubadone(). If the command finished
* with an off line or available status, the drive went
* off line (the idiot controller does not tell us until
* it comes back *on* line, or until we try to use it).
*/
if (mp->mscp_cmdref == 0) {
/*
* No buffer means there is a bug somewhere!
*/
printf("%s%d: io done, but no buffer?\n",
drivename, ui->ui_unit);
mscp_hexdump(mp);
break;
}
rwend:
#ifdef AVOID_EMULEX_BUG
{
register u_short *p = (u_short *) &mp->mscp_cmdref;
/*
* Note any errors on the part of the controller.
* The lower word should be zero after exclusive
* or'ing with mscp_aeb_xor, and the upper should
* then be in the range [1..AEB_MAX_BP].
*/
mp->mscp_cmdref ^= mscp_aeb_xor;
p[1]--;
if (p[1] >= AEB_MAX_BP)
panic("unrecoverable Emulex screwup");
if (p[0] == 0)
mi->mi_ok++;
else {
/*
* Calculate the expected response,
* assuming p[1] is correct. The
* actual response is then the expected
* response xor p[0].
*/
int sb = ((p[1] + 1) << 16) ^ mscp_aeb_xor;
log(LOG_WARNING, "\
Emulex SC41/MS screwup: %s%d, got %d correct, then changed 0x%x to 0x%x\n",
ctlrname, mi->mi_ctlr,
mi->mi_ok, sb, sb ^ p[0]);
mi->mi_ok = 0;
}
/* convert index back to buffer, and mark free */
bp = mi->mi_bp[p[1]];
mi->mi_bp[p[1]] = 0;
}
#else
bp = (struct buf *) mp->mscp_cmdref;
#ifdef MSCP_PARANOIA
{
register struct buf *q = mi->mi_wtab.av_forw;
/*
* Ensure that this response corresponds to
* some outstanding request. If not, ignore
* it entirely. This will likely cause a
* Unibus reset soon, after which the controller
* just might behave.
*/
while (q != bp && q != &mi->mi_wtab)
q = q->av_forw;
if (q != bp) {
printf("%s%d: bad response packet ignored\n",
ctlrname, mi->mi_ctlr);
mscp_hexdump(mp);
goto out;
}
}
#endif MSCP_PARANOIA
#endif AVOID_EMULEX_BUG
/*
* Mark any error-due-to-bad-LBN (via `goto rwend').
* WHAT STATUS WILL THESE HAVE? IT SURE WOULD BE NICE
* IF DEC SOLD DOCUMENTATION FOR THEIR OWN CONTROLLERS.
*/
if (error) {
bp->b_flags |= B_ERROR;
bp->b_error = error;
}
if (st == M_ST_OFFLINE || st == M_ST_AVAILABLE) {
ui->ui_flags &= ~(UNIT_ONLINE | UNIT_HAVESTATUS);
#ifdef notyet
(*md->md_offline)(ui, mp);
#endif
}
/*
* Unlink the transfer from the wait queue mi_wtab.
* If there are no more transfers on the drive queue
* for this drive, and it is a profiled disk, turn
* off its busy bit.
*/
bp->av_back->av_forw = bp->av_forw;
bp->av_forw->av_back = bp->av_back;
if (ui->ui_dk >= 0 && md->md_utab[ui->ui_unit].b_forw == NULL)
dk_busy &= ~(1 << ui->ui_dk);
/*
* If the transfer has something to do with bad
* block forwarding, let the driver handle the
* rest.
*/
if ((bp->b_flags & B_BAD) != 0 && md->md_bb != NULL) {
(*md->md_bb)(ui, mp, bp);
goto out;
}
/*
* If the transfer failed, give the driver a crack
* at fixing things up.
*/
if (st != M_ST_SUCCESS) {
switch ((*md->md_ioerr)(ui, mp, bp)) {
case MSCP_DONE: /* fixed */
break;
case MSCP_RESTARTED: /* still working on it */
goto out;
case MSCP_FAILED: /* no luck */
diskerr(bp, drivename, "hard error",
LOG_PRINTF, -1, md->md_lab ?
&md->md_lab[ui->ui_unit] : md->md_lab);
mscp_printevent(mp);
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
break;
}
}
/*
* Set the residual count and mark the transfer as
* done. If the I/O wait queue is now empty, release
* the shared BDP, if any.
*/
info = bp->b_info; /* we are about to clobber it */
bp->b_resid = bp->b_bcount - mp->mscp_seq.seq_bytecount;
(*md->md_iodone)(mi, bp, info);
out:
break;
case M_OP_REPLACE | M_OP_END:
/*
* A replace operation finished. Just let the driver
* handle it (if it does replaces).
*/
if (md->md_replace == NULL)
printf("%s%d: bogus REPLACE end\n",
drivename, ui->ui_unit);
else
(*md->md_replace)(ui, mp);
break;
default:
/*
* If it is not one of the above, we cannot handle it.
* (And we should not have received it, for that matter.)
*/
unknown:
printf("%s%d: unknown opcode 0x%x status 0x%x ignored\n",
mi->mi_md->md_dname, ui->ui_unit,
mp->mscp_opcode, mp->mscp_status);
mscp_hexdump(mp);
break;
}
/*
* If the drive needs to be put back in the controller queue,
* do that now. (`bp' below ought to be `dp', but they are all
* struct buf *.) Note that b_active was cleared in the driver;
* we presume that there is something to be done, hence reassert it.
*/
if (ui->ui_flags & UNIT_REQUEUE) {
bp = &md->md_utab[ui->ui_unit];
if (bp->b_active) panic("mscp_dorsp requeue");
APPEND(bp, mi->mi_tab, b_forw);
bp->b_active = 1;
ui->ui_flags &= ~UNIT_REQUEUE;
}
done:
/*
* Give back the response packet, and take a look at the next.
*/
mp->mscp_msglen = MSCP_MSGLEN;
mi->mi_rsp.mri_desc[nextrsp] |= MSCP_OWN;
nextrsp = (nextrsp + 1) % mi->mi_rsp.mri_size;
goto loop;
}
/*
* Dump the entire contents of an MSCP packet in hex. Mainly useful
* for debugging....
*/
mscp_hexdump(mp)
register struct mscp *mp;
{
register long *p = (long *) mp;
register int i = mp->mscp_msglen;
if (i > 256) /* sanity */
i = 256;
i /= sizeof (*p); /* ASSUMES MULTIPLE OF sizeof(long) */
while (--i >= 0)
printf("0x%x ", *p++);
printf("\n");
}
/*
* Requeue outstanding transfers, e.g., after bus reset.
* Also requeue any drives that have on line or unit status
* info pending.
*/
mscp_requeue(mi)
struct mscp_info *mi;
{
register struct uba_device *ui;
register struct mscp_driver *md = mi->mi_md;
register struct buf *bp, *dp;
register int unit;
struct buf *nextbp;
/*
* Clear the controller chain. Mark everything un-busy; we
* will soon fix any that are in fact busy.
*/
mi->mi_tab->b_actf = NULL;
mi->mi_tab->b_active = 0;
for (unit = 0, dp = md->md_utab; unit < md->md_nunits; unit++, dp++) {
ui = md->md_dinfo[unit];
if (ui == NULL || !ui->ui_alive || ui->ui_ctlr != mi->mi_ctlr)
continue; /* not ours */
dp->b_forw = NULL;
dp->b_active = 0;
}
/*
* Scan the wait queue, linking buffers onto drive queues.
* Note that these must be put at the front of the drive queue,
* lest we reorder I/O operations.
*/
for (bp = mi->mi_wtab.av_back; bp != &mi->mi_wtab; bp = nextbp) {
nextbp = bp->av_back;
dp = &md->md_utab[minor(bp->b_dev) >> md->md_unitshift];
bp->av_forw = dp->b_actf;
if (dp->b_actf == NULL)
dp->b_actl = bp;
dp->b_actf = bp;
}
mi->mi_wtab.av_forw = mi->mi_wtab.av_back = &mi->mi_wtab;
/*
* Scan for drives waiting for on line or status responses,
* and for drives with pending transfers. Put these on the
* controller queue, and mark the controller busy.
*/
for (unit = 0, dp = md->md_utab; unit < md->md_nunits; unit++, dp++) {
ui = md->md_dinfo[unit];
if (ui == NULL || !ui->ui_alive || ui->ui_ctlr != mi->mi_ctlr)
continue;
ui->ui_flags &= ~(UNIT_HAVESTATUS | UNIT_ONLINE);
if ((ui->ui_flags & UNIT_REQUEUE) == 0 && dp->b_actf == NULL)
continue;
ui->ui_flags &= ~UNIT_REQUEUE;
APPEND(dp, mi->mi_tab, b_forw);
dp->b_active = 1;
mi->mi_tab->b_active = 1;
}
#ifdef AVOID_EMULEX_BUG
/*
* ... and clear the index-to-buffer table.
*/
for (unit = 0; unit < AEB_MAX_BP; unit++)
mi->mi_bp[unit] = 0;
#endif
}
/*
* MSCP error reporting
*/
/*
* Messages for the various subcodes.
*/
static char unknown_msg[] = "unknown subcode";
/*
* Subcodes for Success (0)
*/
static char *succ_msgs[] = {
"normal", /* 0 */
"spin down ignored", /* 1 = Spin-Down Ignored */
"still connected", /* 2 = Still Connected */
unknown_msg,
"dup. unit #", /* 4 = Duplicate Unit Number */
unknown_msg,
unknown_msg,
unknown_msg,
"already online", /* 8 = Already Online */
unknown_msg,
unknown_msg,
unknown_msg,
unknown_msg,
unknown_msg,
unknown_msg,
unknown_msg,
"still online", /* 16 = Still Online */
};
/*
* Subcodes for Invalid Command (1)
*/
static char *icmd_msgs[] = {
"invalid msg length", /* 0 = Invalid Message Length */
};
/*
* Subcodes for Command Aborted (2)
*/
/* none known */
/*
* Subcodes for Unit Offline (3)
*/
static char *offl_msgs[] = {
"unknown drive", /* 0 = Unknown, or online to other ctlr */
"not mounted", /* 1 = Unmounted, or RUN/STOP at STOP */
"inoperative", /* 2 = Unit Inoperative */
unknown_msg,
"duplicate", /* 4 = Duplicate Unit Number */
unknown_msg,
unknown_msg,
unknown_msg,
"in diagnosis", /* 8 = Disabled by FS or diagnostic */
};
/*
* Subcodes for Unit Available (4)
*/
/* none known */
/*
* Subcodes for Media Format Error (5)
*/
static char *media_fmt_msgs[] = {
"fct unread - edc", /* 0 = FCT unreadable */
"invalid sector header",/* 1 = Invalid Sector Header */
"not 512 sectors", /* 2 = Not 512 Byte Sectors */
"not formatted", /* 3 = Not Formatted */
"fct ecc", /* 4 = FCT ECC */
};
/*
* Subcodes for Write Protected (6)
* N.B.: Code 6 subcodes are 7 bits higher than other subcodes
* (i.e., bits 12-15).
*/
static char *wrprot_msgs[] = {
unknown_msg,
"software", /* 1 = Software Write Protect */
"hardware", /* 2 = Hardware Write Protect */
};
/*
* Subcodes for Compare Error (7)
*/
/* none known */
/*
* Subcodes for Data Error (8)
*/
static char *data_msgs[] = {
"forced error", /* 0 = Forced Error (software) */
unknown_msg,
"header compare", /* 2 = Header Compare Error */
"sync timeout", /* 3 = Sync Timeout Error */
unknown_msg,
unknown_msg,
unknown_msg,
"uncorrectable ecc", /* 7 = Uncorrectable ECC */
"1 symbol ecc", /* 8 = 1 bit ECC */
"2 symbol ecc", /* 9 = 2 bit ECC */
"3 symbol ecc", /* 10 = 3 bit ECC */
"4 symbol ecc", /* 11 = 4 bit ECC */
"5 symbol ecc", /* 12 = 5 bit ECC */
"6 symbol ecc", /* 13 = 6 bit ECC */
"7 symbol ecc", /* 14 = 7 bit ECC */
"8 symbol ecc", /* 15 = 8 bit ECC */
};
/*
* Subcodes for Host Buffer Access Error (9)
*/
static char *host_buffer_msgs[] = {
unknown_msg,
"odd xfer addr", /* 1 = Odd Transfer Address */
"odd xfer count", /* 2 = Odd Transfer Count */
"non-exist. memory", /* 3 = Non-Existent Memory */
"memory parity", /* 4 = Memory Parity Error */
};
/*
* Subcodes for Controller Error (10)
*/
static char *cntlr_msgs[] = {
unknown_msg,
"serdes overrun", /* 1 = Serialiser/Deserialiser Overrun */
"edc", /* 2 = Error Detection Code? */
"inconsistant internal data struct",/* 3 = Internal Error */
};
/*
* Subcodes for Drive Error (11)
*/
static char *drive_msgs[] = {
unknown_msg,
"sdi command timeout", /* 1 = SDI Command Timeout */
"ctlr detected protocol",/* 2 = Controller Detected Protocol Error */
"positioner", /* 3 = Positioner Error */
"lost rd/wr ready", /* 4 = Lost R/W Ready Error */
"drive clock dropout", /* 5 = Lost Drive Clock */
"lost recvr ready", /* 6 = Lost Receiver Ready */
"drive detected error", /* 7 = Drive Error */
"ctlr detected pulse or parity",/* 8 = Pulse or Parity Error */
};
/*
* The following table correlates message codes with the
* decoding strings.
*/
struct code_decode {
char *cdc_msg;
int cdc_nsubcodes;
char **cdc_submsgs;
} code_decode[] = {
#define SC(m) sizeof (m) / sizeof (m[0]), m
"success", SC(succ_msgs),
"invalid command", SC(icmd_msgs),
"command aborted", 0, 0,
"unit offline", SC(offl_msgs),
"unit available", 0, 0,
"media format error", SC(media_fmt_msgs),
"write protected", SC(wrprot_msgs),
"compare error", 0, 0,
"data error", SC(data_msgs),
"host buffer access error", SC(host_buffer_msgs),
"controller error", SC(cntlr_msgs),
"drive error", SC(drive_msgs),
#undef SC
};
/*
* Print the decoded error event from an MSCP error datagram.
*/
mscp_printevent(mp)
struct mscp *mp;
{
register int event = mp->mscp_event;
register struct code_decode *cdc;
int c, sc;
char *cm, *scm;
/*
* The code is the lower six bits of the event number (aka
* status). If that is 6 (write protect), the subcode is in
* bits 12-15; otherwise, it is in bits 5-11.
* I WONDER WHAT THE OTHER BITS ARE FOR. IT SURE WOULD BE
* NICE IF DEC SOLD DOCUMENTATION FOR THEIR OWN CONTROLLERS.
*/
c = event & M_ST_MASK;
sc = (c != 6 ? event >> 5 : event >> 12) & 0x7ff;
if (c >= sizeof code_decode / sizeof code_decode[0])
cm = "- unknown code", scm = "??";
else {
cdc = &code_decode[c];
cm = cdc->cdc_msg;
if (sc >= cdc->cdc_nsubcodes)
scm = unknown_msg;
else
scm = cdc->cdc_submsgs[sc];
}
printf(" %s (%s) (code %d, subcode %d)\n", cm, scm, c, sc);
}
/*
* Print the code and logical block number for an error packet.
* THIS IS PROBABLY PECULIAR TO DISK DRIVES. IT SURE WOULD BE
* NICE IF DEC SOLD DOCUMENTATION FOR THEIR OWN CONTROLLERS.
*/
mscp_decodeerror(name, ctlr, mp)
char *name;
int ctlr;
register struct mscp *mp;
{
/*
* For bad blocks, mp->mscp_erd.erd_hdr identifies a code and
* the logical block number. Code 0 is a regular block; code 6
* is a replacement block. The remaining codes are currently
* undefined. The code is in the upper four bits of the header
* (bits 0-27 are the lbn).
*/
int issoft = mp->mscp_flags & (M_LF_SUCC | M_LF_CONT);
static char *codemsg[16] = {
"lbn", "code 1", "code 2", "code 3",
"code 4", "code 5", "rbn", "code 7",
"code 8", "code 9", "code 10", "code 11",
"code 12", "code 13", "code 14", "code 15"
};
#define BADCODE(h) (codemsg[(unsigned)(h) >> 28])
#define BADLBN(h) ((h) & 0xfffffff)
printf("%s%d: %s error datagram%s:", name, ctlr,
issoft ? "soft" : "hard",
mp->mscp_flags & M_LF_CONT ? " (continuing)" : "");
switch (mp->mscp_format & 0377) {
case M_FM_CTLRERR: /* controller error */
break;
case M_FM_BUSADDR: /* host memory access error */
printf(" memory addr 0x%x:", mp->mscp_erd.erd_busaddr);
break;
case M_FM_DISKTRN:
printf(" unit %d: level %d retry %d, %s %d:",
mp->mscp_unit,
mp->mscp_erd.erd_level, mp->mscp_erd.erd_retry,
BADCODE(mp->mscp_erd.erd_hdr),
BADLBN(mp->mscp_erd.erd_hdr));
break;
case M_FM_SDI:
printf(" unit %d: %s %d:", mp->mscp_unit,
BADCODE(mp->mscp_erd.erd_hdr),
BADLBN(mp->mscp_erd.erd_hdr));
break;
case M_FM_SMLDSK:
printf(" unit %d: small disk error, cyl %d:",
mp->mscp_unit, mp->mscp_erd.erd_sdecyl);
break;
default:
printf(" unit %d: unknown error, format 0x%x:",
mp->mscp_unit, mp->mscp_format);
}
mscp_printevent(mp);
#undef BADCODE
#undef BADLBN
}