usr/src/lib/sun_sas/common/Sun_sasRefreshAdapterConfiguration.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 #include    <sun_sas.h>
  28
  29 /*
  30  * Discover an HBA node with  matching path.
  31  * The di_node_t argument should be the root of the device tree.
  32  * This routine assumes the locks have been taken
  33  */
  34 static int
  35 find_matching_hba(di_node_t node, void *arg)
  36 {
  37         int *propData, rval;
  38         walkarg_t *wa = (walkarg_t *)arg;
  39         char    *devpath, fulldevpath[MAXPATHLEN];
  40
  41         /* Skip stub(instance -1) nodes */
  42         if (IS_STUB_NODE(node)) {
  43                 return (DI_WALK_CONTINUE);
  44         }
  45
  46         rval = di_prop_lookup_ints(DDI_DEV_T_ANY, node,
  47             "sm-hba-supported", &propData);
  48         if (rval < 0) {
  49                 return (DI_WALK_CONTINUE);
  50         } else {
  51                 if ((devpath = di_devfs_path(node)) == NULL) {
  52                         /* still continue to see if there is matching one. */
  53                         return (DI_WALK_CONTINUE);
  54                 }
  55                 (void) snprintf(fulldevpath, MAXPATHLEN, "%s%s", DEVICES_DIR,
  56                     devpath);
  57
  58                 if ((strstr(fulldevpath, wa->devpath)) != NULL) {
  59                                 *wa->flag = B_TRUE;
  60                         /* Found a node. No need to walk any more. */
  61                         di_devfs_path_free(devpath);
  62                         return (DI_WALK_TERMINATE);
  63                 }
  64                 di_devfs_path_free(devpath);
  65         }
  66
  67         return (DI_WALK_CONTINUE);
  68 }
  69
  70 /*
  71  * Refreshes information about an HBA
  72  *
  73  * Note: This routine holds the locks in write mode
  74  *       during most of the processing, and as such, will cause
  75  *       all other threads to block on entry into the library
  76  *       until the refresh is complete.  An optimization would be
  77  *       to put fine-grain locking in for the open_handle structures.
  78  */
  79 void
  80 Sun_sasRefreshAdapterConfiguration()
  81 {
  82         const char                  ROUTINE[] =
  83             "Sun_sasRefreshAdapterConfiguration";
  84         struct sun_sas_hba          *hba_ptr;
  85         di_node_t                   root;
  86         hrtime_t                    start;
  87         hrtime_t                    end;
  88         double                      duration;
  89         walkarg_t                   wa;
  90
  91         /*
  92          * We're going to be tweaking a lot of global lists, so write
  93          * lock them.
  94          */
  95         lock(&all_hbas_lock);
  96         lock(&open_handles_lock);
  97
  98         start = gethrtime();
  99         /* Grab device tree */
 100         if ((root = di_init("/", DINFOCACHE)) == DI_NODE_NIL) {
 101                 log(LOG_DEBUG, ROUTINE,
 102                     "Unable to load device tree for reason \"%s\"",
 103                     strerror(errno));
 104                 unlock(&open_handles_lock);
 105                 unlock(&all_hbas_lock);
 106                 return;
 107         }
 108
 109         end = gethrtime();
 110         duration = end - start;
 111         duration /= HR_SECOND;
 112         log(LOG_DEBUG, ROUTINE, "Device tree init took "
 113             "%.6f seconds", duration);
 114
 115         for (hba_ptr = global_hba_head; hba_ptr != NULL;
 116             hba_ptr = hba_ptr->next) {
 117                 wa.devpath = hba_ptr->device_path;
 118                 wa.flag = (boolean_t *)calloc(1, sizeof (boolean_t));
 119                 *wa.flag = B_FALSE;
 120
 121                 if (di_walk_node(root, DI_WALK_SIBFIRST, &wa,
 122                     find_matching_hba) != 0) {
 123                         log(LOG_DEBUG, ROUTINE, "di_walk_node failed.");
 124                         unlock(&open_handles_lock);
 125                         unlock(&all_hbas_lock);
 126                         S_FREE(wa.flag);
 127                         di_fini(root);
 128                         return;
 129                 }
 130
 131                 if (*wa.flag == B_FALSE) {
 132                         /*
 133                          * Keep the HBA as it is including open handles
 134                          * per the SM-HBA standards. Just mark it as invalid.
 135                          */
 136                         log(LOG_DEBUG, ROUTINE, "No matching HBA found. %s",
 137                             hba_ptr->device_path);
 138                         hba_ptr->invalid = B_TRUE;
 139                 }
 140                 S_FREE(wa.flag);
 141         }
 142
 143         /*
 144          * Now we marked missing HBA(s). Redisoover hbas to refresh
 145          * or add any new adapter to the hba list.
 146          * Simply call devtree_get_all_hbas().
 147          */
 148         if (devtree_get_all_hbas(root) != HBA_STATUS_OK) {
 149                 log(LOG_DEBUG, ROUTINE, "devtree_get_all_hbas failed.");
 150         }
 151         di_fini(root);
 152
 153         unlock(&open_handles_lock);
 154         unlock(&all_hbas_lock);
 155 }