272 lines
6.0 KiB
C
272 lines
6.0 KiB
C
/* $OpenBSD: mpath_emc.c,v 1.25 2022/07/02 08:50:42 visa Exp $ */
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/*
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* Copyright (c) 2011 David Gwynne <dlg@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* EMC CLARiiON AX/CX support for mpath(4) */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/queue.h>
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#include <sys/rwlock.h>
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#include <sys/pool.h>
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#include <sys/ioctl.h>
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#include <scsi/scsi_all.h>
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#include <scsi/scsiconf.h>
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#include <scsi/mpathvar.h>
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#define EMC_VPD_SP_INFO 0xc0
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struct emc_vpd_sp_info {
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struct scsi_vpd_hdr hdr; /* EMC_VPD_SP_INFO */
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u_int8_t lun_state;
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#define EMC_SP_INFO_LUN_STATE_UNBOUND 0x00
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#define EMC_SP_INFO_LUN_STATE_BOUND 0x01
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#define EMC_SP_INFO_LUN_STATE_OWNED 0x02
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u_int8_t default_sp;
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u_int8_t _reserved1[1];
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u_int8_t port;
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u_int8_t current_sp;
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u_int8_t _reserved2[1];
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u_int8_t unique_id[16];
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u_int8_t _reserved3[1];
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u_int8_t type;
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u_int8_t failover_mode;
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u_int8_t _reserved4[21];
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u_int8_t serial[16];
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} __packed;
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struct emc_softc {
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struct device sc_dev;
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struct mpath_path sc_path;
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struct scsi_xshandler sc_xsh;
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struct emc_vpd_sp_info *sc_pg;
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};
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#define DEVNAME(_s) ((_s)->sc_dev.dv_xname)
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int emc_match(struct device *, void *, void *);
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void emc_attach(struct device *, struct device *, void *);
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int emc_detach(struct device *, int);
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int emc_activate(struct device *, int);
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const struct cfattach emc_ca = {
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sizeof(struct emc_softc),
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emc_match,
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emc_attach,
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emc_detach,
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emc_activate
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};
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struct cfdriver emc_cd = {
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NULL,
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"emc",
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DV_DULL
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};
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void emc_mpath_start(struct scsi_xfer *);
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int emc_mpath_checksense(struct scsi_xfer *);
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void emc_mpath_status(struct scsi_link *);
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const struct mpath_ops emc_mpath_ops = {
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"emc",
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emc_mpath_checksense,
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emc_mpath_status
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};
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struct emc_device {
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char *vendor;
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char *product;
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};
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void emc_status(struct scsi_xfer *);
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void emc_status_done(struct scsi_xfer *);
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int emc_sp_info(struct emc_softc *, int *);
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struct emc_device emc_devices[] = {
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/* " vendor " " device " */
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/* "01234567" "0123456789012345" */
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{ "DGC ", "RAID" },
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{ "DGC ", "DISK" },
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{ "DGC ", "VRAID" }
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};
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int
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emc_match(struct device *parent, void *match, void *aux)
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{
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struct scsi_attach_args *sa = aux;
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struct scsi_inquiry_data *inq = &sa->sa_sc_link->inqdata;
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struct emc_device *s;
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int i;
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if (mpath_path_probe(sa->sa_sc_link) != 0)
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return (0);
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for (i = 0; i < nitems(emc_devices); i++) {
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s = &emc_devices[i];
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if (bcmp(s->vendor, inq->vendor, strlen(s->vendor)) == 0 &&
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bcmp(s->product, inq->product, strlen(s->product)) == 0)
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return (8);
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}
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return (0);
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}
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void
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emc_attach(struct device *parent, struct device *self, void *aux)
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{
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struct emc_softc *sc = (struct emc_softc *)self;
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struct scsi_attach_args *sa = aux;
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struct scsi_link *link = sa->sa_sc_link;
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int sp;
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printf("\n");
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/* init link */
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link->device_softc = sc;
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/* init path */
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scsi_xsh_set(&sc->sc_path.p_xsh, link, emc_mpath_start);
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sc->sc_path.p_link = link;
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/* init status handler */
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scsi_xsh_set(&sc->sc_xsh, link, emc_status);
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sc->sc_pg = dma_alloc(sizeof(*sc->sc_pg), PR_WAITOK);
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/* let's go */
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if (emc_sp_info(sc, &sp)) {
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printf("%s: unable to get sp info\n", DEVNAME(sc));
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return;
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}
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if (mpath_path_attach(&sc->sc_path, sp, &emc_mpath_ops) != 0)
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printf("%s: unable to attach path\n", DEVNAME(sc));
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}
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int
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emc_detach(struct device *self, int flags)
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{
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struct emc_softc *sc = (struct emc_softc *)self;
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dma_free(sc->sc_pg, sizeof(*sc->sc_pg));
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return (0);
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}
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int
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emc_activate(struct device *self, int act)
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{
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struct emc_softc *sc = (struct emc_softc *)self;
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switch (act) {
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case DVACT_DEACTIVATE:
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if (sc->sc_path.p_group != NULL)
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mpath_path_detach(&sc->sc_path);
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break;
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}
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return (0);
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}
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void
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emc_mpath_start(struct scsi_xfer *xs)
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{
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struct emc_softc *sc = xs->sc_link->device_softc;
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mpath_start(&sc->sc_path, xs);
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}
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int
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emc_mpath_checksense(struct scsi_xfer *xs)
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{
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struct scsi_sense_data *sense = &xs->sense;
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if ((sense->error_code & SSD_ERRCODE) == SSD_ERRCODE_CURRENT &&
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(sense->flags & SSD_KEY) == SKEY_NOT_READY &&
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ASC_ASCQ(sense) == 0x0403) {
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/* Logical Unit Not Ready, Manual Intervention Required */
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return (MPATH_SENSE_FAILOVER);
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}
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return (MPATH_SENSE_DECLINED);
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}
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void
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emc_mpath_status(struct scsi_link *link)
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{
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struct emc_softc *sc = link->device_softc;
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scsi_xsh_add(&sc->sc_xsh);
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}
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void
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emc_status(struct scsi_xfer *xs)
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{
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struct scsi_link *link = xs->sc_link;
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struct emc_softc *sc = link->device_softc;
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scsi_init_inquiry(xs, SI_EVPD, EMC_VPD_SP_INFO,
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sc->sc_pg, sizeof(*sc->sc_pg));
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xs->done = emc_status_done;
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scsi_xs_exec(xs);
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}
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void
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emc_status_done(struct scsi_xfer *xs)
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{
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struct scsi_link *link = xs->sc_link;
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struct emc_softc *sc = link->device_softc;
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struct emc_vpd_sp_info *pg = sc->sc_pg;
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int status = MPATH_S_UNKNOWN;
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if (xs->error == XS_NOERROR) {
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status = (pg->lun_state == EMC_SP_INFO_LUN_STATE_OWNED) ?
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MPATH_S_ACTIVE : MPATH_S_PASSIVE;
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}
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scsi_xs_put(xs);
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mpath_path_status(&sc->sc_path, status);
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}
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int
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emc_sp_info(struct emc_softc *sc, int *sp)
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{
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struct emc_vpd_sp_info *pg = sc->sc_pg;
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int error;
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error = scsi_inquire_vpd(sc->sc_path.p_link, pg, sizeof(*pg),
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EMC_VPD_SP_INFO, scsi_autoconf);
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if (error != 0)
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return (error);
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*sp = pg->current_sp;
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printf("%s: SP-%c port %d\n", DEVNAME(sc), pg->current_sp + 'A',
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pg->port);
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return (0);
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}
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