libdiskmgt/common/bus.c

/*
 * 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 (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.
 */

#include <fcntl.h>
#include <libdevinfo.h>
#include <stdlib.h>
#include <sys/sunddi.h>
#include <sys/types.h>
#include <sys/scsi/conf/autoconf.h>

#include "libdiskmgt.h"
#include "disks_private.h"

static descriptor_t **get_assoc_buses(descriptor_t *desc, int *errp);
static descriptor_t **get_assoc_controllers(descriptor_t *desc, int *errp);

descriptor_t **
bus_get_assoc_descriptors(descriptor_t *desc, dm_desc_type_t type, int *errp)
{
    switch (type) {
    case DM_BUS:
        return (get_assoc_buses(desc, errp));
    case DM_CONTROLLER:
        return (get_assoc_controllers(desc, errp));
    }

    *errp = EINVAL;
    return (NULL);
}

nvlist_t *
bus_get_attributes(descriptor_t *dp, int *errp)
{
    bus_t       *bp;
    nvlist_t    *attrs;

    if (nvlist_alloc(&attrs, NVATTRS, 0) != 0) {
        *errp = ENOMEM;
        return (NULL);
    }

    bp = dp->p.bus;

    if (nvlist_add_string(attrs, DM_BTYPE, bp->btype) != 0) {
        nvlist_free(attrs);
        *errp = ENOMEM;
        return (NULL);
    }

    if (bp->freq != 0) {
        if (nvlist_add_uint32(attrs, DM_CLOCK, bp->freq) != 0) {
        nvlist_free(attrs);
        *errp = ENOMEM;
        return (NULL);
        }
    }

    if (bp->pname != NULL) {
        if (nvlist_add_string(attrs, DM_PNAME, bp->pname) != 0) {
        nvlist_free(attrs);
        *errp = ENOMEM;
        return (NULL);
        }
    }

    *errp = 0;
    return (attrs);
}

descriptor_t *
bus_get_descriptor_by_name(char *name, int *errp)
{
    descriptor_t    **buses;
    int     i;
    descriptor_t    *bus = NULL;

    buses = cache_get_descriptors(DM_BUS, errp);
    if (*errp != 0) {
        return (NULL);
    }

    for (i = 0; buses[i]; i++) {
        if (libdiskmgt_str_eq(name, buses[i]->p.bus->name)) {
        bus = buses[i];
        } else {
        /* clean up the unused descriptors */
        cache_free_descriptor(buses[i]);
        }
    }
    free(buses);

    if (bus == NULL) {
        *errp = ENODEV;
    }

    return (bus);
}

/* ARGSUSED */
descriptor_t **
bus_get_descriptors(int filter[], int *errp)
{
    return (cache_get_descriptors(DM_BUS, errp));
}

char *
bus_get_name(descriptor_t *desc)
{
    return (desc->p.bus->name);
}

/* ARGSUSED */
nvlist_t *
bus_get_stats(descriptor_t *dp, int stat_type, int *errp)
{
    /* There are no stat types defined for controllers */
    *errp = EINVAL;
    return (NULL);
}

int
bus_make_descriptors()
{
    bus_t   *bp;
    int error = 0;
    int locked;

    cache_rlock(&locked);
    bp = cache_get_buslist();
    while ((error == 0) && (bp != NULL)) {
        cache_load_desc(DM_BUS, bp, NULL, NULL, &error);
        bp = bp->next;
    }
    cache_unlock(&locked);

    return (error);
}

static descriptor_t **
get_assoc_buses(descriptor_t *desc, int *errp)
{
    bus_t       *bp;
    char        *name;
    descriptor_t    **allbuses;
    descriptor_t    **buses;
    int     cnt;
    int     i;
    int     pos;

    bp = desc->p.bus;
    name = bp->name;

    allbuses = cache_get_descriptors(DM_BUS, errp);
    if (*errp != 0) {
        return (NULL);
    }

    /* Count how many we have (we overcount, but thats ok). */
    for (cnt = 0; allbuses[cnt]; cnt++);

    /* make the snapshot */
    buses = (descriptor_t **)calloc(cnt + 1, sizeof (descriptor_t *));
    if (buses == NULL) {
        *errp = ENOMEM;
        cache_free_descriptors(allbuses);
        return (NULL);
    }

    /*
     * Get this buses parent bus and get the buses that I am the parent of.
     */
    pos = 0;
    for (i = 0; allbuses[i]; i++) {
        if (libdiskmgt_str_eq(name, allbuses[i]->p.bus->pname)) {
        buses[pos++] = allbuses[i];
        } else if (bp->pname != NULL &&
        libdiskmgt_str_eq(bp->pname, allbuses[i]->p.bus->name)) {

        buses[pos++] = allbuses[i];
        } else {
        /* clean up the unused descriptor */
        cache_free_descriptor(allbuses[i]);
        }
    }
    buses[pos] = NULL;

    free(allbuses);

    *errp = 0;
    return (buses);
}

static descriptor_t **
get_assoc_controllers(descriptor_t *desc, int *errp)
{
    bus_t       *bp;
    descriptor_t    **controllers;
    int     cnt;
    int     i;

    bp = desc->p.bus;

    /* Count how many we have. */
    for (cnt = 0; bp->controllers[cnt]; cnt++);

    /* make the snapshot */
    controllers = (descriptor_t **)calloc(cnt + 1, sizeof (descriptor_t *));
    if (controllers == NULL) {
        *errp = ENOMEM;
        return (NULL);
    }

    for (i = 0; bp->controllers[i]; i++) {
        controllers[i] = cache_get_desc(DM_CONTROLLER, bp->controllers[i],
        NULL, NULL, errp);
        if (*errp != 0) {
        cache_free_descriptors(controllers);
        return (NULL);
        }
    }
    controllers[i] = NULL;

    *errp = 0;
    return (controllers);
}