usr/src/lib/sun_sas/common/Sun_sasLoadLibrary.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27
  28 #include <sun_sas.h>
  29
  30 /*
  31  * Loads the HBA Library.  Must be called before calling any HBA library
  32  * functions
  33  *
  34  * Return values:
  35  *      HBA_STATUS_OK       library properly loaded
  36  *      HBA_STATUS_ERROR    library loaded incorrectly
  37  */
  38 int     loadCount = 0;
  39 HBA_STATUS Sun_sasLoadLibrary() {
  40         const char      ROUTINE[] = "Sun_sasLoadLibrary";
  41         di_node_t       root;
  42         boolean_t       atLeastOneHBA = B_FALSE;
  43         boolean_t       atLeastOneFailure = B_FALSE;
  44         hrtime_t            start = 0;
  45         hrtime_t            end = 0;
  46         double              duration = 0;
  47
  48         /* Make sure that library has not been already loaded */
  49         if (loadCount++ > 0) {
  50                 log(LOG_DEBUG, ROUTINE, "Library already loaded %d time."
  51                     " Ignoring.", loadCount);
  52                 return (HBA_STATUS_ERROR);
  53         }
  54         hba_count = 0;
  55         open_handle_index = 1;
  56         /* Initialize the read-write lock */
  57         if (mutex_init(&all_hbas_lock, USYNC_THREAD, NULL)) {
  58             log(LOG_DEBUG, ROUTINE,
  59                 "Unable to initialize lock in LoadLibrary for reason \"%s\"",
  60                 strerror(errno));
  61             return (HBA_STATUS_ERROR);
  62         }
  63         /* grab write lock */
  64         lock(&all_hbas_lock);
  65
  66         start = gethrtime();
  67         if ((root = di_init("/", DINFOCACHE)) == DI_NODE_NIL) {
  68             log(LOG_DEBUG, ROUTINE,
  69                 "Unable to load device tree for reason \"%s\"",
  70                 strerror(errno));
  71             unlock(&all_hbas_lock);
  72             return (HBA_STATUS_ERROR);
  73         }
  74         end = gethrtime();
  75         duration = end - start;
  76         duration /= HR_SECOND;
  77         log(LOG_DEBUG, ROUTINE, "Loading device tree init took "
  78             "%.6f seconds", duration);
  79
  80         /* At load time, we only gather libdevinfo information */
  81         if (devtree_get_all_hbas(root) == HBA_STATUS_OK) {
  82             atLeastOneHBA = B_TRUE;
  83         } else {
  84             atLeastOneFailure = B_TRUE;
  85         }
  86
  87         di_fini(root);
  88
  89         unlock(&all_hbas_lock);
  90
  91         /* Now determine what status code to return */
  92         if (atLeastOneHBA) {
  93             /* We've got at least one HBA and possibly some failures */
  94             return (HBA_STATUS_OK);
  95         } else if (atLeastOneFailure) {
  96             /* We have no HBAs but have failures */
  97             return (HBA_STATUS_ERROR);
  98         } else {
  99             /* We have no HBAs and no failures */
 100             return (HBA_STATUS_OK);
 101         }
 102 }