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/* $OpenBSD: mpath_emc.c,v 1.23 2020/06/30 18:43:37 krw Exp $ */
/*
* Copyright (c) 2011 David Gwynne <dlg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* EMC CLARiiON AX/CX support for mpath(4) */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/queue.h>
#include <sys/rwlock.h>
#include <sys/pool.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/selinfo.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/mpathvar.h>
#define EMC_VPD_SP_INFO 0xc0
struct emc_vpd_sp_info {
struct scsi_vpd_hdr hdr; /* EMC_VPD_SP_INFO */
u_int8_t lun_state;
#define EMC_SP_INFO_LUN_STATE_UNBOUND 0x00
#define EMC_SP_INFO_LUN_STATE_BOUND 0x01
#define EMC_SP_INFO_LUN_STATE_OWNED 0x02
u_int8_t default_sp;
u_int8_t _reserved1[1];
u_int8_t port;
u_int8_t current_sp;
u_int8_t _reserved2[1];
u_int8_t unique_id[16];
u_int8_t _reserved3[1];
u_int8_t type;
u_int8_t failover_mode;
u_int8_t _reserved4[21];
u_int8_t serial[16];
} __packed;
struct emc_softc {
struct device sc_dev;
struct mpath_path sc_path;
struct scsi_xshandler sc_xsh;
struct emc_vpd_sp_info *sc_pg;
};
#define DEVNAME(_s) ((_s)->sc_dev.dv_xname)
int emc_match(struct device *, void *, void *);
void emc_attach(struct device *, struct device *, void *);
int emc_detach(struct device *, int);
int emc_activate(struct device *, int);
struct cfattach emc_ca = {
sizeof(struct emc_softc),
emc_match,
emc_attach,
emc_detach,
emc_activate
};
struct cfdriver emc_cd = {
NULL,
"emc",
DV_DULL
};
void emc_mpath_start(struct scsi_xfer *);
int emc_mpath_checksense(struct scsi_xfer *);
void emc_mpath_status(struct scsi_link *);
const struct mpath_ops emc_mpath_ops = {
"emc",
emc_mpath_checksense,
emc_mpath_status
};
struct emc_device {
char *vendor;
char *product;
};
void emc_status(struct scsi_xfer *);
void emc_status_done(struct scsi_xfer *);
int emc_sp_info(struct emc_softc *, int *);
struct emc_device emc_devices[] = {
/* " vendor " " device " */
/* "01234567" "0123456789012345" */
{ "DGC ", "RAID" },
{ "DGC ", "DISK" },
{ "DGC ", "VRAID" }
};
int
emc_match(struct device *parent, void *match, void *aux)
{
struct scsi_attach_args *sa = aux;
struct scsi_inquiry_data *inq = &sa->sa_sc_link->inqdata;
struct emc_device *s;
int i;
if (mpath_path_probe(sa->sa_sc_link) != 0)
return (0);
for (i = 0; i < nitems(emc_devices); i++) {
s = &emc_devices[i];
if (bcmp(s->vendor, inq->vendor, strlen(s->vendor)) == 0 &&
bcmp(s->product, inq->product, strlen(s->product)) == 0)
return (8);
}
return (0);
}
void
emc_attach(struct device *parent, struct device *self, void *aux)
{
struct emc_softc *sc = (struct emc_softc *)self;
struct scsi_attach_args *sa = aux;
struct scsi_link *link = sa->sa_sc_link;
int sp;
printf("\n");
/* init link */
link->device_softc = sc;
/* init path */
scsi_xsh_set(&sc->sc_path.p_xsh, link, emc_mpath_start);
sc->sc_path.p_link = link;
/* init status handler */
scsi_xsh_set(&sc->sc_xsh, link, emc_status);
sc->sc_pg = dma_alloc(sizeof(*sc->sc_pg), PR_WAITOK);
/* let's go */
if (emc_sp_info(sc, &sp)) {
printf("%s: unable to get sp info\n", DEVNAME(sc));
return;
}
if (mpath_path_attach(&sc->sc_path, sp, &emc_mpath_ops) != 0)
printf("%s: unable to attach path\n", DEVNAME(sc));
}
int
emc_detach(struct device *self, int flags)
{
struct emc_softc *sc = (struct emc_softc *)self;
dma_free(sc->sc_pg, sizeof(*sc->sc_pg));
return (0);
}
int
emc_activate(struct device *self, int act)
{
struct emc_softc *sc = (struct emc_softc *)self;
switch (act) {
case DVACT_DEACTIVATE:
if (sc->sc_path.p_group != NULL)
mpath_path_detach(&sc->sc_path);
break;
}
return (0);
}
void
emc_mpath_start(struct scsi_xfer *xs)
{
struct emc_softc *sc = xs->sc_link->device_softc;
mpath_start(&sc->sc_path, xs);
}
int
emc_mpath_checksense(struct scsi_xfer *xs)
{
struct scsi_sense_data *sense = &xs->sense;
if ((sense->error_code & SSD_ERRCODE) == SSD_ERRCODE_CURRENT &&
(sense->flags & SSD_KEY) == SKEY_NOT_READY &&
ASC_ASCQ(sense) == 0x0403) {
/* Logical Unit Not Ready, Manual Intervention Required */
return (MPATH_SENSE_FAILOVER);
}
return (MPATH_SENSE_DECLINED);
}
void
emc_mpath_status(struct scsi_link *link)
{
struct emc_softc *sc = link->device_softc;
scsi_xsh_add(&sc->sc_xsh);
}
void
emc_status(struct scsi_xfer *xs)
{
struct scsi_link *link = xs->sc_link;
struct emc_softc *sc = link->device_softc;
scsi_init_inquiry(xs, SI_EVPD, EMC_VPD_SP_INFO,
sc->sc_pg, sizeof(*sc->sc_pg));
xs->done = emc_status_done;
scsi_xs_exec(xs);
}
void
emc_status_done(struct scsi_xfer *xs)
{
struct scsi_link *link = xs->sc_link;
struct emc_softc *sc = link->device_softc;
struct emc_vpd_sp_info *pg = sc->sc_pg;
int status = MPATH_S_UNKNOWN;
if (xs->error == XS_NOERROR) {
status = (pg->lun_state == EMC_SP_INFO_LUN_STATE_OWNED) ?
MPATH_S_ACTIVE : MPATH_S_PASSIVE;
}
scsi_xs_put(xs);
mpath_path_status(&sc->sc_path, status);
}
int
emc_sp_info(struct emc_softc *sc, int *sp)
{
struct emc_vpd_sp_info *pg = sc->sc_pg;
int error;
error = scsi_inquire_vpd(sc->sc_path.p_link, pg, sizeof(*pg),
EMC_VPD_SP_INFO, scsi_autoconf);
if (error != 0)
return (error);
*sp = pg->current_sp;
printf("%s: SP-%c port %d\n", DEVNAME(sc), pg->current_sp + 'A',
pg->port);
return (0);
}
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