scsi_vhci/fops/tape.c

	tape.c revision 0205780bc43902d17f94f07ceacb0cd8d5eab20f
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * Implementation of "scsi_vhci_f_tape" tape failover_ops.
 *
 * This file was historically meant for only tape implementation.  It has
 * been extended to manage SUN "supported" tape controllers. The supported
 * VID/PID shall be listed in the tape_dev_table.
 */

#include <sys/conf.h>
#include <sys/file.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/scsi/scsi.h>
#include <sys/scsi/adapters/scsi_vhci.h>

/* Supported device table entries.  */
static char *tape_dev_table[] = {
/*  "                  111111" */
/*  "012345670123456789012345" */
/*  "|-VID--||-----PID------|" */
    "IBM     ULTRIUM-TD3",
    "IBM     ULTRIUM-TD4",
    NULL
};

/* Failover module plumbing. */
SCSI_FAILOVER_OP("f_tape", tape, "%I%");

/* ARGSUSED */
static int
tape_device_probe(struct scsi_device *sd, struct scsi_inquiry *inquiry,
    void **ctpriv)
{
    int i;
    int rval = SFO_DEVICE_PROBE_PHCI;

    VHCI_DEBUG(6, (CE_NOTE, NULL, "!tape_device_probe: inquiry string %s\n",
        inquiry->inq_vid));
    /*
     * See if this a device type that we want to care about.
     */
    switch (inquiry->inq_dtype & DTYPE_MASK) {
    case DTYPE_SEQUENTIAL:
        break;
    case DTYPE_CHANGER:
        rval = SFO_DEVICE_PROBE_VHCI;
        goto done;
    default:
        /*
         * Not interested.
         */
        return (rval);
    }

    /*
     * If it reports that it supports tpgs and it got here it may have
     * failed the tpgs commands. It might or might not support dual port
     * but we'll go with it.
     */
    if (inquiry->inq_tpgs) {
        VHCI_DEBUG(6, (CE_NOTE, NULL, "!has tpgs bits: %s\n",
            inquiry->inq_vid));
        rval = SFO_DEVICE_PROBE_VHCI;
    } else if (inquiry->inq_dualp) {
        /*
         * Looks like it claims to have more then one port.
         */
        VHCI_DEBUG(6, (CE_NOTE, NULL, "!has dual port bits: %s\n",
            inquiry->inq_vid));
        rval = SFO_DEVICE_PROBE_VHCI;
    } else {

        /*
         * See if this device is on the list.
         */
        for (i = 0; tape_dev_table[i]; i++) {

            if (strncmp(inquiry->inq_vid, tape_dev_table[i],
                strlen(tape_dev_table[i])) == 0) {
                VHCI_DEBUG(6, (CE_NOTE, NULL,
                    "!was on the list: %s\n",
                    inquiry->inq_vid));
                rval = SFO_DEVICE_PROBE_VHCI;
                break;
            }
        }
    }
done:
    if (rval == SFO_DEVICE_PROBE_VHCI) {
        if (mdi_set_lb_policy(sd->sd_dev, LOAD_BALANCE_NONE) !=
            MDI_SUCCESS) {
            VHCI_DEBUG(6, (CE_NOTE, NULL, "!fail load balance none"
                ": %s\n", inquiry->inq_vid));
            return (SFO_DEVICE_PROBE_PHCI);
        }

    }
    return (rval);
}

/* ARGSUSED */
static void
tape_device_unprobe(struct scsi_device *sd, void *ctpriv)
{
    /*
     * NO OP for tape.
     */

}

/* ARGSUSED */
static int
tape_path_activate(struct scsi_device *sd, char *pathclass, void *ctpriv)
{
    return (0);
}

/* ARGSUSED */
static int
tape_path_deactivate(struct scsi_device *sd, char *pathclass, void *ctpriv)
{
    return (0);
}

/* ARGSUSED */
static int
tape_path_get_opinfo(struct scsi_device *sd, struct scsi_path_opinfo *opinfo,
    void *ctpriv)
{
    opinfo->opinfo_rev = OPINFO_REV;
    (void) strcpy(opinfo->opinfo_path_attr, PCLASS_PRIMARY);
    opinfo->opinfo_path_state  = SCSI_PATH_ACTIVE;
    opinfo->opinfo_pswtch_best = 0;     /* N/A */
    opinfo->opinfo_pswtch_worst = 0;    /* N/A */
    opinfo->opinfo_xlf_capable = 0;
    opinfo->opinfo_mode = SCSI_NO_FAILOVER;
    opinfo->opinfo_preferred = 1;

    return (0);
}

/* ARGSUSED */
static int
tape_path_ping(struct scsi_device *sd, void *ctpriv)
{
    return (1);
}

/* ARGSUSED */
static int
tape_analyze_sense(struct scsi_device *sd, struct scsi_extended_sense *sense,
    void *ctpriv)
{
    if (sense->es_key == KEY_ABORTED_COMMAND &&
        sense->es_add_code == 0x4b &&
        sense->es_qual_code == 0x83) {
        return (SCSI_SENSE_INACTIVE);
    }
    if (sense->es_key == KEY_NOT_READY &&
        sense->es_add_code == 0x4 &&
        sense->es_qual_code == 0x1) {
        return (SCSI_SENSE_NOT_READY);
    }
    return (SCSI_SENSE_NOFAILOVER);
}

/* ARGSUSED */
static int
tape_pathclass_next(char *cur, char **nxt, void *ctpriv)
{
    if (cur == NULL) {
        *nxt = PCLASS_PRIMARY;
        return (0);
    } else if (strcmp(cur, PCLASS_PRIMARY) == 0) {
        return (ENOENT);
    }
    return (EINVAL);
}