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  * Copyright 2019 Joyent, Inc.
  28  */
  29
  30 #include    <sun_sas.h>
  31
  32 /*
  33  * Discover an HBA node with  matching path.
  34  * The di_node_t argument should be the root of the device tree.
  35  * This routine assumes the locks have been taken
  36  */
  37 static int
  38 find_matching_hba(di_node_t node, void *arg)
  39 {
  40         int *propData, rval;
  41         walkarg_t *wa = (walkarg_t *)arg;
  42         char    *devpath, fulldevpath[MAXPATHLEN];
  43
  44         /* Skip stub(instance -1) nodes */
  45         if (IS_STUB_NODE(node)) {
  46                 return (DI_WALK_CONTINUE);
  47         }
  48
  49         rval = di_prop_lookup_ints(DDI_DEV_T_ANY, node,
  50             "sm-hba-supported", &propData);
  51         if (rval < 0) {
  52                 return (DI_WALK_CONTINUE);
  53         } else {
  54                 if ((devpath = di_devfs_path(node)) == NULL) {
  55                         /* still continue to see if there is matching one. */
  56                         return (DI_WALK_CONTINUE);
  57                 }
  58                 (void) snprintf(fulldevpath, MAXPATHLEN, "%s%s", DEVICES_DIR,
  59                     devpath);
  60
  61                 if ((strstr(fulldevpath, wa->devpath)) != NULL) {
  62                         *wa->flag = B_TRUE;
  63                         /* Found a node. No need to walk any more. */
  64                         di_devfs_path_free(devpath);
  65                         return (DI_WALK_TERMINATE);
  66                 }
  67                 di_devfs_path_free(devpath);
  68         }
  69
  70         return (DI_WALK_CONTINUE);
  71 }
  72
  73 /*
  74  * Refreshes information about an HBA
  75  *
  76  * Note: This routine holds the locks in write mode
  77  *       during most of the processing, and as such, will cause
  78  *       all other threads to block on entry into the library
  79  *       until the refresh is complete.  An optimization would be
  80  *       to put fine-grain locking in for the open_handle structures.
  81  */
  82 void
  83 Sun_sasRefreshAdapterConfiguration()
  84 {
  85         const char                  ROUTINE[] =
  86             "Sun_sasRefreshAdapterConfiguration";
  87         struct sun_sas_hba          *hba_ptr;
  88         di_node_t                   root;
  89         hrtime_t                    start;
  90         hrtime_t                    end;
  91         double                      duration;
  92         walkarg_t                   wa;
  93
  94         /*
  95          * We're going to be tweaking a lot of global lists, so write
  96          * lock them.
  97          */
  98         lock(&all_hbas_lock);
  99         lock(&open_handles_lock);
 100
 101         start = gethrtime();
 102         /* Grab device tree */
 103         if ((root = di_init("/", DINFOCACHE)) == DI_NODE_NIL) {
 104                 log(LOG_DEBUG, ROUTINE,
 105                     "Unable to load device tree for reason \"%s\"",
 106                     strerror(errno));
 107                 unlock(&open_handles_lock);
 108                 unlock(&all_hbas_lock);
 109                 return;
 110         }
 111
 112         end = gethrtime();
 113         duration = end - start;
 114         duration /= HR_SECOND;
 115         log(LOG_DEBUG, ROUTINE, "Device tree init took "
 116             "%.6f seconds", duration);
 117
 118         for (hba_ptr = global_hba_head; hba_ptr != NULL;
 119             hba_ptr = hba_ptr->next) {
 120                 wa.devpath = hba_ptr->device_path;
 121                 wa.flag = (boolean_t *)calloc(1, sizeof (boolean_t));
 122                 *wa.flag = B_FALSE;
 123
 124                 if (di_walk_node(root, DI_WALK_SIBFIRST, &wa,
 125                     find_matching_hba) != 0) {
 126                         log(LOG_DEBUG, ROUTINE, "di_walk_node failed.");
 127                         unlock(&open_handles_lock);
 128                         unlock(&all_hbas_lock);
 129                         S_FREE(wa.flag);
 130                         di_fini(root);
 131                         return;
 132                 }
 133
 134                 if (*wa.flag == B_FALSE) {
 135                         /*
 136                          * Keep the HBA as it is including open handles
 137                          * per the SM-HBA standards. Just mark it as invalid.
 138                          */
 139                         log(LOG_DEBUG, ROUTINE, "No matching HBA found. %s",
 140                             hba_ptr->device_path);
 141                         hba_ptr->invalid = B_TRUE;
 142                 }
 143                 S_FREE(wa.flag);
 144         }
 145
 146         /*
 147          * Now we marked missing HBA(s). Redisoover hbas to refresh
 148          * or add any new adapter to the hba list.
 149          * Simply call devtree_get_all_hbas().
 150          */
 151         if (devtree_get_all_hbas(root) != HBA_STATUS_OK) {
 152                 log(LOG_DEBUG, ROUTINE, "devtree_get_all_hbas failed.");
 153         }
 154         di_fini(root);
 155
 156         unlock(&open_handles_lock);
 157         unlock(&all_hbas_lock);
 158 }