usr/src/lib/sun_sas/common/Sun_sasRefreshInformation.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  mtaching 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 match_smhba_sas_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                         /* add the hba to the hba list */
  60                         if (devtree_get_one_hba(node) ==
  61                             HBA_STATUS_OK) {
  62                                 /* succeed to refresh the adapater. */
  63                                 *wa->flag = B_TRUE;
  64                         }
  65                         /* Found a node. No need to walk any more. */
  66                         di_devfs_path_free(devpath);
  67                         return (DI_WALK_TERMINATE);
  68                 }
  69                 di_devfs_path_free(devpath);
  70         }
  71
  72         return (DI_WALK_CONTINUE);
  73 }
  74
  75 /*
  76  * Refreshes information about an HBA
  77  *
  78  * Note: This routine holds the locks in write mode
  79  *       during most of the processing, and as such, will cause
  80  *       all other threads to block on entry into the library
  81  *       until the refresh is complete.  An optimization would be
  82  *       to put fine-grain locking in for the open_handle structures.
  83  */
  84 void
  85 Sun_sasRefreshInformation(HBA_HANDLE handle)
  86 {
  87         const char                  ROUTINE[] = "Sun_sasRefreshInformation";
  88         struct sun_sas_hba          *hba_ptr;
  89         struct open_handle          *oHandle;
  90         di_node_t                   root;
  91         hrtime_t                    start;
  92         hrtime_t                    end;
  93         double                      duration;
  94         walkarg_t                   wa;
  95
  96         /* take a lock for hbas and handles during rerfresh. */
  97         lock(&all_hbas_lock);
  98         lock(&open_handles_lock);
  99
 100         oHandle = RetrieveOpenHandle(handle);
 101         if (oHandle == NULL) {
 102                 log(LOG_DEBUG, ROUTINE, "Invalid handle %08lx", handle);
 103                 unlock(&open_handles_lock);
 104                 unlock(&all_hbas_lock);
 105                 return;
 106         }
 107
 108         /* now we know the associated hba exists in the global list. */
 109         start = gethrtime();
 110         /* Grab device tree */
 111         if ((root = di_init("/", DINFOCACHE)) == DI_NODE_NIL) {
 112                 log(LOG_DEBUG, ROUTINE,
 113                     "Unable to load device tree for reason \"%s\"",
 114                     strerror(errno));
 115                 unlock(&open_handles_lock);
 116                 unlock(&all_hbas_lock);
 117                 return;
 118         }
 119
 120         end = gethrtime();
 121         duration = end - start;
 122         duration /= HR_SECOND;
 123         log(LOG_DEBUG, ROUTINE, "Device tree init took "
 124             "%.6f seconds", duration);
 125
 126         hba_ptr = RetrieveHandle(oHandle->adapterIndex);
 127         wa.devpath = hba_ptr->device_path;
 128         wa.flag = (boolean_t *)calloc(1, sizeof (boolean_t));
 129         *wa.flag = B_FALSE;
 130
 131         /* found the matching hba node and refresh hba ports and targets. */
 132         if (di_walk_node(root, DI_WALK_SIBFIRST, &wa,
 133             match_smhba_sas_hba) != 0) {
 134                 log(LOG_DEBUG, ROUTINE, "di_walk_node failed.");
 135                 unlock(&open_handles_lock);
 136                 unlock(&all_hbas_lock);
 137                 S_FREE(wa.flag);
 138                 di_fini(root);
 139                 return;
 140         }
 141
 142         if (*wa.flag != B_TRUE) {
 143                 /* no matching HBA. */
 144                 log(LOG_DEBUG, ROUTINE, "No matching HBA found.");
 145                 unlock(&open_handles_lock);
 146                 unlock(&all_hbas_lock);
 147                 S_FREE(wa.flag);
 148                 di_fini(root);
 149                 return;
 150         }
 151
 152         S_FREE(wa.flag);
 153
 154         di_fini(root);
 155
 156         /* All done, release the locks */
 157         unlock(&open_handles_lock);
 158         unlock(&all_hbas_lock);
 159 }