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NetBSD/sys/arch/vax/mscp/mscp.c

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/* $NetBSD: mscp.c,v 1.5 1997/01/11 11:20:31 ragge Exp $ */
/*
* Copyright (c) 1996 Ludd, University of Lule}, Sweden.
* 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 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.
*
* @(#)mscp.c 7.5 (Berkeley) 12/16/90
*/
/*
* MSCP generic driver routines
*/
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <vax/mscp/mscp.h>
#include <vax/mscp/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_softc *mi;
int canwait;
{
#define mri (&mi->mi_cmd)
register struct mscp *mp;
register int i;
int s = splbio();
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
/*
* Handle a response ring transition.
*/
void
mscp_dorsp(mi)
register struct mscp_softc *mi;
{
struct device *drive;
struct mscp_device *me = mi->mi_me;
struct mscp_ctlr *mc = mi->mi_mc;
register struct buf *bp;
register struct mscp *mp;
register int nextrsp;
int st, error, info;
extern int cold;
extern struct mscp slavereply;
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;
}
mp = &mi->mi_rsp.mri_ring[nextrsp];
mi->mi_credits += MSCP_CREDITS(mp->mscp_msgtc);
/*
* 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)) {
if ((mp->mscp_status & M_ST_MASK) == M_ST_SUCCESS) {
mi->mi_flags |= MSC_READY;
} else {
printf("%s: SETCTLRC failed: %d ",
mi->mi_dev.dv_xname, mp->mscp_status);
mscp_printevent(mp);
}
goto done;
}
/*
* Found a response. Update credit information. If there is
* nothing else to do, jump to `done' to get the next response.
*/
if (mp->mscp_unit >= mi->mi_driveno) { /* Must expand drive table */
int tmpno = ((mp->mscp_unit + 32) & 0xffe0) * sizeof(void *);
struct device **tmp = (struct device **)
malloc(tmpno, M_DEVBUF, M_NOWAIT);
bzero(tmp, tmpno);
if (mi->mi_driveno) {
bcopy(mi->mi_dp, tmp, mi->mi_driveno);
free(mi->mi_dp, mi->mi_driveno);
}
mi->mi_driveno = tmpno;
mi->mi_dp = tmp;
}
drive = mi->mi_dp[mp->mscp_unit];
switch (MSCP_MSGTYPE(mp->mscp_msgtc)) {
case MSCPT_SEQ:
break;
case MSCPT_DATAGRAM:
(*me->me_dgram)(drive, mp, mi);
goto done;
case MSCPT_CREDITS:
goto done;
case MSCPT_MAINTENANCE:
default:
printf("%s: unit %d: unknown message type 0x%x ignored\n",
mi->mi_dev.dv_xname, mp->mscp_unit,
MSCP_MSGTYPE(mp->mscp_msgtc));
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: bad lbn (%d)?\n", drive->dv_xname,
(int)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.
*/
(*me->me_online)(drive, mp);
break;
case M_OP_GETUNITST | M_OP_END:
/*
* Got unit status. If we are autoconfiguring, save
* the mscp struct so that mscp_attach know what to do.
* If the drive isn't configured, call config_found()
* to set it up, otherwise it's just a "normal" unit
* status.
*/
if (cold)
bcopy(mp, &slavereply, sizeof(struct mscp));
if (mp->mscp_status == (M_ST_OFFLINE|M_OFFLINE_UNKNOWN))
break;
if (drive == 0) {
struct drive_attach_args da;
da.da_mp = (struct mscp *)mp;
da.da_typ = mi->mi_type;
config_found(&mi->mi_dev, (void *)&da, mscp_print);
} else
/* Hack to avoid complaints */
if (!(((mp->mscp_event & M_ST_MASK) == M_ST_AVAILABLE)
&& cold))
(*me->me_gotstatus)(drive, mp);
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??
*/
#ifdef notyet
(*md->md_offline)(ui, mp);
#endif
break;
case M_OP_POS | M_OP_END:
case M_OP_WRITM | M_OP_END:
/*
* A non-data transfer operation completed.
*/
(*me->me_cmddone)(drive, mp);
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).
*/
#ifdef DIAGNOSTIC
if (mp->mscp_cmdref == 0) {
/*
* No buffer means there is a bug somewhere!
*/
printf("%s: io done, but no buffer?\n",
drive->dv_xname);
mscp_hexdump(mp);
break;
}
#endif
rwend:
bp = (struct buf *) mp->mscp_cmdref;
/*
* 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) {
#ifdef notyet
(*md->md_offline)(ui, mp);
#endif
}
/*
* Unlink the transfer from the wait queue.
*/
_remque(&bp->b_actf);
/*
* If the transfer has something to do with bad
* block forwarding, let the driver handle the
* rest.
*/
if ((bp->b_flags & B_BAD) != 0 && me->me_bb != NULL) {
(*me->me_bb)(drive, mp, bp);
goto out;
}
/*
* If the transfer failed, give the driver a crack
* at fixing things up.
*/
if (st != M_ST_SUCCESS) {
switch ((*me->me_ioerr)(drive, mp, bp)) {
case MSCP_DONE: /* fixed */
break;
case MSCP_RESTARTED: /* still working on it */
goto out;
case MSCP_FAILED: /* no luck */
/* XXX must move to ra.c */
mscp_printevent(mp);
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;
(*mc->mc_ctlrdone)(mi->mi_dev.dv_parent, info);
(*me->me_iodone)(drive, bp);
out:
break;
case M_OP_REPLACE | M_OP_END:
/*
* A replace operation finished. Just let the driver
* handle it (if it does replaces).
*/
if (me->me_replace == NULL)
printf("%s: bogus REPLACE end\n", drive->dv_xname);
else
(*me->me_replace)(drive, 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: unknown opcode 0x%x status 0x%x ignored\n",
drive->dv_xname, mp->mscp_opcode, mp->mscp_status);
#ifdef DIAGNOSTIC
mscp_hexdump(mp);
#endif
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.
*/
#ifdef notyet /* XXX */
if (ui->ui_flags & UNIT_REQUEUE) {
bp = &md->md_utab[ui->ui_unit];
if (bp->b_active) panic("mscp_dorsp requeue");
MSCP_APPEND(bp, mi->mi_XXXtab, b_hash.le_next);
/* Was: MSCP_APPEND(bp, mi->mi_XXXtab, b_forw); */
bp->b_active = 1;
ui->ui_flags &= ~UNIT_REQUEUE;
}
#endif
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;
}
/*
* Requeue outstanding transfers, e.g., after bus reset.
* Also requeue any drives that have on line or unit status
* info pending.
*/
void
mscp_requeue(mi)
struct mscp_softc *mi;
{
register struct mscp_device *me = mi->mi_me;
register struct buf *bp, *dp;
register int unit;
struct buf *nextbp;
panic("mscp_requeue");
/*
* Clear the controller chain. Mark everything un-busy; we
* will soon fix any that are in fact busy.
*/
#ifdef notyet /* XXX */
mi->mi_XXXtab->b_actf = NULL;
mi->mi_XXXtab->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_hash.le_next = 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_XXXwtab.b_actb; bp != &mi->mi_XXXwtab; bp = nextbp) {
nextbp = *bp->b_actb;
dp = &md->md_utab[minor(bp->b_dev) >> md->md_unitshift];
bp->b_actf = dp->b_actf;
if (dp->b_actf == NULL)
dp->b_actb = (void *)bp;
dp->b_actf = bp;
}
mi->mi_XXXwtab.b_actf = *mi->mi_XXXwtab.b_actb = &mi->mi_XXXwtab;
/*
* 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;
MSCP_APPEND(dp, mi->mi_XXXtab, b_hash.le_next);
dp->b_active = 1;
mi->mi_XXXtab->b_active = 1;
}
#endif
#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
}
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