sun_sas/common/Sun_sasRefreshAdapterConfiguration.c

	Sun_sasRefreshAdapterConfiguration.c revision 9e86db79b7d1bbc5f2f04e99954cbd5eae0e22bb
/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include    <sun_sas.h>

/*
 * Discover an HBA node with  matching path.
 * The di_node_t argument should be the root of the device tree.
 * This routine assumes the locks have been taken
 */
static int
find_matching_hba(di_node_t node, void *arg)
{
    int *propData, rval;
    walkarg_t *wa = (walkarg_t *)arg;
    char    *devpath, fulldevpath[MAXPATHLEN];

    /* Skip stub(instance -1) nodes */
    if (IS_STUB_NODE(node)) {
        return (DI_WALK_CONTINUE);
    }

    rval = di_prop_lookup_ints(DDI_DEV_T_ANY, node,
        "sm-hba-supported", &propData);
    if (rval < 0) {
        return (DI_WALK_CONTINUE);
    } else {
        if ((devpath = di_devfs_path(node)) == NULL) {
            /* still continue to see if there is matching one. */
            return (DI_WALK_CONTINUE);
        }
        (void) snprintf(fulldevpath, MAXPATHLEN, "%s%s", DEVICES_DIR,
            devpath);

        if ((strstr(fulldevpath, wa->devpath)) != NULL) {
                *wa->flag = B_TRUE;
            /* Found a node. No need to walk any more. */
            di_devfs_path_free(devpath);
            return (DI_WALK_TERMINATE);
        }
        di_devfs_path_free(devpath);
    }

    return (DI_WALK_CONTINUE);
}

/*
 * Refreshes information about an HBA
 *
 * Note: This routine holds the locks in write mode
 *       during most of the processing, and as such, will cause
 *   all other threads to block on entry into the library
 *   until the refresh is complete.  An optimization would be
 *       to put fine-grain locking in for the open_handle structures.
 */
void
Sun_sasRefreshAdapterConfiguration()
{
    const char          ROUTINE[] =
        "Sun_sasRefreshAdapterConfiguration";
    struct sun_sas_hba      *hba_ptr;
    di_node_t           root;
    hrtime_t            start;
    hrtime_t            end;
    double              duration;
    walkarg_t           wa;

    /*
     * We're going to be tweaking a lot of global lists, so write
     * lock them.
     */
    lock(&all_hbas_lock);
    lock(&open_handles_lock);

    start = gethrtime();
    /* Grab device tree */
    if ((root = di_init("/", DINFOCACHE)) == DI_NODE_NIL) {
        log(LOG_DEBUG, ROUTINE,
            "Unable to load device tree for reason \"%s\"",
            strerror(errno));
        unlock(&open_handles_lock);
        unlock(&all_hbas_lock);
        return;
    }

    end = gethrtime();
    duration = end - start;
    duration /= HR_SECOND;
    log(LOG_DEBUG, ROUTINE, "Device tree init took "
        "%.6f seconds", duration);

    for (hba_ptr = global_hba_head; hba_ptr != NULL;
        hba_ptr = hba_ptr->next) {
        wa.devpath = hba_ptr->device_path;
        wa.flag = (boolean_t *)calloc(1, sizeof (boolean_t));
        *wa.flag = B_FALSE;

        if (di_walk_node(root, DI_WALK_SIBFIRST, &wa,
            find_matching_hba) != 0) {
            log(LOG_DEBUG, ROUTINE, "di_walk_node failed.");
            unlock(&open_handles_lock);
            unlock(&all_hbas_lock);
            S_FREE(wa.flag);
            di_fini(root);
            return;
        }

        if (*wa.flag == B_FALSE) {
            /*
             * Keep the HBA as it is including open handles
             * per the SM-HBA standards. Just mark it as invalid.
             */
            log(LOG_DEBUG, ROUTINE, "No matching HBA found. %s",
                hba_ptr->device_path);
            hba_ptr->invalid = B_TRUE;
        }
        S_FREE(wa.flag);
    }

    /*
     * Now we marked missing HBA(s). Redisoover hbas to refresh
     * or add any new adapter to the hba list.
     * Simply call devtree_get_all_hbas().
     */
    if (devtree_get_all_hbas(root) != HBA_STATUS_OK) {
        log(LOG_DEBUG, ROUTINE, "devtree_get_all_hbas failed.");
    }
    di_fini(root);

    unlock(&open_handles_lock);
    unlock(&all_hbas_lock);
}