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NetBSD/sys/scsi/ch.c

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/* $NetBSD: ch.c,v 1.24 1996/10/12 23:23:14 christos Exp $ */
/*
* Copyright (c) 1996 Jason R. Thorpe <thorpej@and.com>
* All rights reserved.
*
* Partially based on an autochanger driver written by Stefan Grefen
* and on an autochanger driver written by the Systems Programming Group
* at the University of Utah Computer Science Department.
*
* 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 acknowledgements:
* This product includes software developed by Jason R. Thorpe
* for And Communications, http://www.and.com/
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/chio.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_changer.h>
#include <scsi/scsiconf.h>
#define CHRETRIES 2
#define CHUNIT(x) (minor((x)))
struct ch_softc {
struct device sc_dev; /* generic device info */
struct scsi_link *sc_link; /* link in the SCSI bus */
int sc_picker; /* current picker */
/*
* The following information is obtained from the
* element address assignment page.
*/
int sc_firsts[4]; /* firsts, indexed by CHET_* */
int sc_counts[4]; /* counts, indexed by CHET_* */
/*
* The following mask defines the legal combinations
* of elements for the MOVE MEDIUM command.
*/
u_int8_t sc_movemask[4];
/*
* As above, but for EXCHANGE MEDIUM.
*/
u_int8_t sc_exchangemask[4];
int flags; /* misc. info */
};
/* sc_flags */
#define CHF_ROTATE 0x01 /* picker can rotate */
/* Autoconfiguration glue */
int chmatch __P((struct device *, void *, void *));
void chattach __P((struct device *, struct device *, void *));
struct cfattach ch_ca = {
sizeof(struct ch_softc), chmatch, chattach
};
struct cfdriver ch_cd = {
NULL, "ch", DV_DULL
};
struct scsi_inquiry_pattern ch_patterns[] = {
{T_CHANGER, T_REMOV,
"", "", ""},
};
/* SCSI glue */
struct scsi_device ch_switch = {
NULL, NULL, NULL, NULL
};
int ch_move __P((struct ch_softc *, struct changer_move *));
int ch_exchange __P((struct ch_softc *, struct changer_exchange *));
int ch_position __P((struct ch_softc *, struct changer_position *));
int ch_usergetelemstatus __P((struct ch_softc *, int, u_int8_t *));
int ch_getelemstatus __P((struct ch_softc *, int, int, caddr_t, size_t));
int ch_get_params __P((struct ch_softc *, int));
int
chmatch(parent, match, aux)
struct device *parent;
void *match, *aux;
{
struct scsibus_attach_args *sa = aux;
int priority;
(void)scsi_inqmatch(sa->sa_inqbuf,
(caddr_t)ch_patterns, sizeof(ch_patterns)/sizeof(ch_patterns[0]),
sizeof(ch_patterns[0]), &priority);
return (priority);
}
void
chattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct ch_softc *sc = (struct ch_softc *)self;
struct scsibus_attach_args *sa = aux;
struct scsi_link *link = sa->sa_sc_link;
/* Glue into the SCSI bus */
sc->sc_link = link;
link->device = &ch_switch;
link->device_softc = sc;
link->openings = 1;
printf("\n");
/*
* Get information about the device. Note we can't use
* interrupts yet.
*/
if (ch_get_params(sc, SCSI_AUTOCONF))
printf("%s: offline\n", sc->sc_dev.dv_xname);
else {
printf("%s: %d slot%s, %d drive%s, %d picker%s",
sc->sc_dev.dv_xname,
sc->sc_counts[CHET_ST], (sc->sc_counts[CHET_ST] > 1) ?
"s" : "",
sc->sc_counts[CHET_DT], (sc->sc_counts[CHET_DT] > 1) ?
"s" : "",
sc->sc_counts[CHET_MT], (sc->sc_counts[CHET_MT] > 1) ?
"s" : "");
if (sc->sc_counts[CHET_IE])
printf(", %d portal%s", sc->sc_counts[CHET_IE],
(sc->sc_counts[CHET_IE] > 1) ? "s" : "");
printf("\n");
#ifdef CHANGER_DEBUG
printf("%s: move mask: 0x%x 0x%x 0x%x 0x%x\n",
sc->sc_dev.dv_xname,
sc->sc_movemask[CHET_MT], sc->sc_movemask[CHET_ST],
sc->sc_movemask[CHET_IE], sc->sc_movemask[CHET_DT]);
printf("%s: exchange mask: 0x%x 0x%x 0x%x 0x%x\n",
sc->sc_dev.dv_xname,
sc->sc_exchangemask[CHET_MT], sc->sc_exchangemask[CHET_ST],
sc->sc_exchangemask[CHET_IE], sc->sc_exchangemask[CHET_DT]);
#endif /* CHANGER_DEBUG */
}
/* Default the current picker. */
sc->sc_picker = sc->sc_firsts[CHET_MT];
}
int
chopen(dev, flags, fmt, p)
dev_t dev;
int flags, fmt;
struct proc *p;
{
struct ch_softc *sc;
int unit, error = 0;
unit = CHUNIT(dev);
if ((unit >= ch_cd.cd_ndevs) ||
((sc = ch_cd.cd_devs[unit]) == NULL))
return (ENXIO);
/*
* Only allow one open at a time.
*/
if (sc->sc_link->flags & SDEV_OPEN)
return (EBUSY);
sc->sc_link->flags |= SDEV_OPEN;
/*
* Absorb any unit attention errors. Ignore "not ready"
* since this might occur if e.g. a tape isn't actually
* loaded in the drive.
*/
error = scsi_test_unit_ready(sc->sc_link,
SCSI_IGNORE_NOT_READY|SCSI_IGNORE_MEDIA_CHANGE);
if (error)
goto bad;
/*
* Make sure our parameters are up to date.
*/
if ((error = ch_get_params(sc, 0)) != 0)
goto bad;
return (0);
bad:
sc->sc_link->flags &= ~SDEV_OPEN;
return (error);
}
int
chclose(dev, flags, fmt, p)
dev_t dev;
int flags, fmt;
struct proc *p;
{
struct ch_softc *sc = ch_cd.cd_devs[CHUNIT(dev)];
sc->sc_link->flags &= ~SDEV_OPEN;
return (0);
}
int
chioctl(dev, cmd, data, flags, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flags;
struct proc *p;
{
struct ch_softc *sc = ch_cd.cd_devs[CHUNIT(dev)];
int error = 0;
/*
* If this command can change the device's state, we must
* have the device open for writing.
*/
switch (cmd) {
case CHIOGPICKER:
case CHIOGPARAMS:
case CHIOGSTATUS:
break;
default:
if ((flags & FWRITE) == 0)
return (EBADF);
}
switch (cmd) {
case CHIOMOVE:
error = ch_move(sc, (struct changer_move *)data);
break;
case CHIOEXCHANGE:
error = ch_exchange(sc, (struct changer_exchange *)data);
break;
case CHIOPOSITION:
error = ch_position(sc, (struct changer_position *)data);
break;
case CHIOGPICKER:
*(int *)data = sc->sc_picker - sc->sc_firsts[CHET_MT];
break;
case CHIOSPICKER: {
int new_picker = *(int *)data;
if (new_picker > (sc->sc_counts[CHET_MT] - 1))
return (EINVAL);
sc->sc_picker = sc->sc_firsts[CHET_MT] + new_picker;
break; }
case CHIOGPARAMS: {
struct changer_params *cp = (struct changer_params *)data;
cp->cp_curpicker = sc->sc_picker - sc->sc_firsts[CHET_MT];
cp->cp_npickers = sc->sc_counts[CHET_MT];
cp->cp_nslots = sc->sc_counts[CHET_ST];
cp->cp_nportals = sc->sc_counts[CHET_IE];
cp->cp_ndrives = sc->sc_counts[CHET_DT];
break; }
case CHIOGSTATUS: {
struct changer_element_status *ces =
(struct changer_element_status *)data;
error = ch_usergetelemstatus(sc, ces->ces_type, ces->ces_data);
break; }
/* Implement prevent/allow? */
default:
error = scsi_do_ioctl(sc->sc_link, dev, cmd, data, flags, p);
break;
}
return (error);
}
int
ch_move(sc, cm)
struct ch_softc *sc;
struct changer_move *cm;
{
struct scsi_move_medium cmd;
u_int16_t fromelem, toelem;
/*
* Check arguments.
*/
if ((cm->cm_fromtype > CHET_DT) || (cm->cm_totype > CHET_DT))
return (EINVAL);
if ((cm->cm_fromunit > (sc->sc_counts[cm->cm_fromtype] - 1)) ||
(cm->cm_tounit > (sc->sc_counts[cm->cm_totype] - 1)))
return (ENODEV);
/*
* Check the request against the changer's capabilities.
*/
if ((sc->sc_movemask[cm->cm_fromtype] & (1 << cm->cm_totype)) == 0)
return (EINVAL);
/*
* Calculate the source and destination elements.
*/
fromelem = sc->sc_firsts[cm->cm_fromtype] + cm->cm_fromunit;
toelem = sc->sc_firsts[cm->cm_totype] + cm->cm_tounit;
/*
* Build the SCSI command.
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = MOVE_MEDIUM;
_lto2b(sc->sc_picker, cmd.tea);
_lto2b(fromelem, cmd.src);
_lto2b(toelem, cmd.dst);
if (cm->cm_flags & CM_INVERT)
cmd.flags |= MOVE_MEDIUM_INVERT;
/*
* Send command to changer.
*/
return (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
sizeof(cmd), NULL, 0, CHRETRIES, 100000, NULL, 0));
}
int
ch_exchange(sc, ce)
struct ch_softc *sc;
struct changer_exchange *ce;
{
struct scsi_exchange_medium cmd;
u_int16_t src, dst1, dst2;
/*
* Check arguments.
*/
if ((ce->ce_srctype > CHET_DT) || (ce->ce_fdsttype > CHET_DT) ||
(ce->ce_sdsttype > CHET_DT))
return (EINVAL);
if ((ce->ce_srcunit > (sc->sc_counts[ce->ce_srctype] - 1)) ||
(ce->ce_fdstunit > (sc->sc_counts[ce->ce_fdsttype] - 1)) ||
(ce->ce_sdstunit > (sc->sc_counts[ce->ce_sdsttype] - 1)))
return (ENODEV);
/*
* Check the request against the changer's capabilities.
*/
if (((sc->sc_exchangemask[ce->ce_srctype] &
(1 << ce->ce_fdsttype)) == 0) ||
((sc->sc_exchangemask[ce->ce_fdsttype] &
(1 << ce->ce_sdsttype)) == 0))
return (EINVAL);
/*
* Calculate the source and destination elements.
*/
src = sc->sc_firsts[ce->ce_srctype] + ce->ce_srcunit;
dst1 = sc->sc_firsts[ce->ce_fdsttype] + ce->ce_fdstunit;
dst2 = sc->sc_firsts[ce->ce_sdsttype] + ce->ce_sdstunit;
/*
* Build the SCSI command.
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = EXCHANGE_MEDIUM;
_lto2b(sc->sc_picker, cmd.tea);
_lto2b(src, cmd.src);
_lto2b(dst1, cmd.fdst);
_lto2b(dst2, cmd.sdst);
if (ce->ce_flags & CE_INVERT1)
cmd.flags |= EXCHANGE_MEDIUM_INV1;
if (ce->ce_flags & CE_INVERT2)
cmd.flags |= EXCHANGE_MEDIUM_INV2;
/*
* Send command to changer.
*/
return (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
sizeof(cmd), NULL, 0, CHRETRIES, 100000, NULL, 0));
}
int
ch_position(sc, cp)
struct ch_softc *sc;
struct changer_position *cp;
{
struct scsi_position_to_element cmd;
u_int16_t dst;
/*
* Check arguments.
*/
if (cp->cp_type > CHET_DT)
return (EINVAL);
if (cp->cp_unit > (sc->sc_counts[cp->cp_type] - 1))
return (ENODEV);
/*
* Calculate the destination element.
*/
dst = sc->sc_firsts[cp->cp_type] + cp->cp_unit;
/*
* Build the SCSI command.
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = POSITION_TO_ELEMENT;
_lto2b(sc->sc_picker, cmd.tea);
_lto2b(dst, cmd.dst);
if (cp->cp_flags & CP_INVERT)
cmd.flags |= POSITION_TO_ELEMENT_INVERT;
/*
* Send command to changer.
*/
return (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
sizeof(cmd), NULL, 0, CHRETRIES, 100000, NULL, 0));
}
/*
* Perform a READ ELEMENT STATUS on behalf of the user, and return to
* the user only the data the user is interested in (i.e. an array of
* flags bytes).
*/
int
ch_usergetelemstatus(sc, chet, uptr)
struct ch_softc *sc;
int chet;
u_int8_t *uptr;
{
struct read_element_status_header *st_hdr;
struct read_element_status_page_header *pg_hdr;
struct read_element_status_descriptor *desc;
caddr_t data = NULL;
size_t size, desclen;
int avail, i, error = 0;
u_int8_t *user_data = NULL;
/*
* If there are no elements of the requested type in the changer,
* the request is invalid.
*/
if (sc->sc_counts[chet] == 0)
return (EINVAL);
/*
* Request one descriptor for the given element type. This
* is used to determine the size of the descriptor so that
* we can allocate enough storage for all of them. We assume
* that the first one can fit into 1k.
*/
data = (caddr_t)malloc(1024, M_DEVBUF, M_WAITOK);
error = ch_getelemstatus(sc, sc->sc_firsts[chet], 1, data, 1024);
if (error)
goto done;
st_hdr = (struct read_element_status_header *)data;
pg_hdr = (struct read_element_status_page_header *)((u_long)st_hdr +
sizeof(struct read_element_status_header));
desclen = _2btol(pg_hdr->edl);
size = sizeof(struct read_element_status_header) +
sizeof(struct read_element_status_page_header) +
(desclen * sc->sc_counts[chet]);
/*
* Reallocate storage for descriptors and get them from the
* device.
*/
free(data, M_DEVBUF);
data = (caddr_t)malloc(size, M_DEVBUF, M_WAITOK);
error = ch_getelemstatus(sc, sc->sc_firsts[chet],
sc->sc_counts[chet], data, size);
if (error)
goto done;
/*
* Fill in the user status array.
*/
st_hdr = (struct read_element_status_header *)data;
avail = _2btol(st_hdr->count);
if (avail != sc->sc_counts[chet])
printf("%s: warning, READ ELEMENT STATUS avail != count\n",
sc->sc_dev.dv_xname);
user_data = (u_int8_t *)malloc(avail, M_DEVBUF, M_WAITOK);
desc = (struct read_element_status_descriptor *)((u_long)data +
sizeof(struct read_element_status_header) +
sizeof(struct read_element_status_page_header));
for (i = 0; i < avail; ++i) {
user_data[i] = desc->flags1;
(u_long)desc += desclen;
}
/* Copy flags array out to userspace. */
error = copyout(user_data, uptr, avail);
done:
if (data != NULL)
free(data, M_DEVBUF);
if (user_data != NULL)
free(user_data, M_DEVBUF);
return (error);
}
int
ch_getelemstatus(sc, first, count, data, datalen)
struct ch_softc *sc;
int first, count;
caddr_t data;
size_t datalen;
{
struct scsi_read_element_status cmd;
/*
* Build SCSI command.
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = READ_ELEMENT_STATUS;
_lto2b(first, cmd.sea);
_lto2b(count, cmd.count);
_lto3b(datalen, cmd.len);
/*
* Send command to changer.
*/
return (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
sizeof(cmd), (u_char *)data, datalen, CHRETRIES, 100000, NULL, 0));
}
/*
* Ask the device about itself and fill in the parameters in our
* softc.
*/
int
ch_get_params(sc, scsiflags)
struct ch_softc *sc;
int scsiflags;
{
struct scsi_mode_sense cmd;
struct scsi_mode_sense_data {
struct scsi_mode_header header;
union {
struct page_element_address_assignment ea;
struct page_transport_geometry_parameters tg;
struct page_device_capabilities cap;
} pages;
} sense_data;
int error, from;
u_int8_t *moves, *exchanges;
/*
* Grab info from the element address assignment page.
*/
bzero(&cmd, sizeof(cmd));
bzero(&sense_data, sizeof(sense_data));
cmd.opcode = MODE_SENSE;
cmd.byte2 |= 0x08; /* disable block descriptors */
cmd.page = 0x1d;
cmd.length = (sizeof(sense_data) & 0xff);
error = scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
sizeof(cmd), (u_char *)&sense_data, sizeof(sense_data), CHRETRIES,
6000, NULL, scsiflags | SCSI_DATA_IN);
if (error) {
printf("%s: could not sense element address page\n",
sc->sc_dev.dv_xname);
return (error);
}
sc->sc_firsts[CHET_MT] = _2btol(sense_data.pages.ea.mtea);
sc->sc_counts[CHET_MT] = _2btol(sense_data.pages.ea.nmte);
sc->sc_firsts[CHET_ST] = _2btol(sense_data.pages.ea.fsea);
sc->sc_counts[CHET_ST] = _2btol(sense_data.pages.ea.nse);
sc->sc_firsts[CHET_IE] = _2btol(sense_data.pages.ea.fieea);
sc->sc_counts[CHET_IE] = _2btol(sense_data.pages.ea.niee);
sc->sc_firsts[CHET_DT] = _2btol(sense_data.pages.ea.fdtea);
sc->sc_counts[CHET_DT] = _2btol(sense_data.pages.ea.ndte);
/* XXX ask for page trasport geom */
/*
* Grab info from the capabilities page.
*/
bzero(&cmd, sizeof(cmd));
bzero(&sense_data, sizeof(sense_data));
cmd.opcode = MODE_SENSE;
cmd.byte2 |= 0x08; /* disable block descriptors */
cmd.page = 0x1f;
cmd.length = (sizeof(sense_data) & 0xff);
error = scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
sizeof(cmd), (u_char *)&sense_data, sizeof(sense_data), CHRETRIES,
6000, NULL, scsiflags | SCSI_DATA_IN);
if (error) {
printf("%s: could not sense capabilities page\n",
sc->sc_dev.dv_xname);
return (error);
}
bzero(sc->sc_movemask, sizeof(sc->sc_movemask));
bzero(sc->sc_exchangemask, sizeof(sc->sc_exchangemask));
moves = &sense_data.pages.cap.move_from_mt;
exchanges = &sense_data.pages.cap.exchange_with_mt;
for (from = CHET_MT; from <= CHET_DT; ++from) {
sc->sc_movemask[from] = moves[from];
sc->sc_exchangemask[from] = exchanges[from];
}
sc->sc_link->flags |= SDEV_MEDIA_LOADED;
return (0);
}
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