sun_sas/common/Sun_sasRefreshInformation.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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include    "sun_sas.h"

/*
 * Discover an HBA node with  mtaching path.
 * The di_node_t argument should be the root of the device tree.
 * This routine assumes the locks have been taken
 */
static int
match_smhba_sas_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) {
            /* add the hba to the hba list */
            if (devtree_get_one_hba(node) ==
                HBA_STATUS_OK) {
                /* succeed to refresh the adapater. */
                *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_sasRefreshInformation(HBA_HANDLE handle)
{
    const char          ROUTINE[] = "Sun_sasRefreshInformation";
    struct sun_sas_hba      *hba_ptr;
    struct open_handle      *oHandle;
    di_node_t           root;
    hrtime_t            start;
    hrtime_t            end;
    double              duration;
    walkarg_t           wa;

    /* take a lock for hbas and handles during rerfresh. */
    lock(&all_hbas_lock);
    lock(&open_handles_lock);

    oHandle = RetrieveOpenHandle(handle);
    if (oHandle == NULL) {
        log(LOG_DEBUG, ROUTINE, "Invalid handle %08lx", handle);
        unlock(&open_handles_lock);
        unlock(&all_hbas_lock);
        return;
    }

    /* now we know the associated hba exists in the global list. */
    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);

    hba_ptr = RetrieveHandle(oHandle->adapterIndex);
    wa.devpath = hba_ptr->device_path;
    wa.flag = (boolean_t *)calloc(1, sizeof (boolean_t));
    *wa.flag = B_FALSE;

    /* found the matching hba node and refresh hba ports and targets. */
    if (di_walk_node(root, DI_WALK_SIBFIRST, &wa,
        match_smhba_sas_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_TRUE) {
        /* no matching HBA. */
        log(LOG_DEBUG, ROUTINE, "No matching HBA found.");
        unlock(&open_handles_lock);
        unlock(&all_hbas_lock);
        S_FREE(wa.flag);
        di_fini(root);
        return;
    }

    S_FREE(wa.flag);

    di_fini(root);

    /* All done, release the locks */
    unlock(&open_handles_lock);
    unlock(&all_hbas_lock);
}