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 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <assert.h> 32 #include <sys/types.h> 33 #include <libdevinfo.h> 34 #include <fm/topo_mod.h> 35 #include <pcibus.h> 36 #include <did.h> 37 38 #include "did_impl.h" 39 #include "did_props.h" 40 41 static did_hash_t *did_hash_create(topo_mod_t *); 42 static void did_hash_destroy(did_hash_t *); 43 44 int 45 did_hash_init(topo_mod_t *hdl) 46 { 47 did_hash_t *dh = did_hash_create(hdl); 48 49 if (dh != NULL) { 50 topo_mod_setspecific(hdl, (void *) dh); 51 return (0); 52 } else { 53 return (-1); 54 } 55 } 56 57 void 58 did_hash_fini(topo_mod_t *mod) 59 { 60 did_hash_t *dh = (did_hash_t *)topo_mod_getspecific(mod); 61 62 topo_mod_setspecific(mod, NULL); 63 if (dh == NULL) 64 return; 65 did_hash_destroy(dh); 66 } 67 68 static uint64_t 69 did_dnhash(di_node_t key) 70 { 71 static uint64_t key_divisor = 0; 72 uint64_t keyn; 73 74 /* 75 * A bit naughty here, we're aware that a di_info_t is a 76 * pointer to a struct. For our hashing, we want use the size 77 * of that struct, which we determine here, somewhat 78 * impolitely. 79 */ 80 if (key_divisor == 0) 81 key_divisor = sizeof (*key); 82 83 keyn = (uintptr_t)key; 84 85 return (keyn / key_divisor); 86 } 87 88 static did_hash_t * 89 did_hash_create(topo_mod_t *hdl) 90 { 91 did_hash_t *r = topo_mod_zalloc(hdl, sizeof (did_hash_t)); 92 93 if (r == NULL) { 94 (void) topo_mod_seterrno(hdl, EMOD_NOMEM); 95 return (NULL); 96 } 97 r->dph_mod = hdl; 98 r->dph_hashlen = REC_HASHLEN; 99 r->dph_hash = topo_mod_zalloc(hdl, 100 r->dph_hashlen * sizeof (did_t *)); 101 if (r->dph_hash == NULL) { 102 topo_mod_free(hdl, r, sizeof (did_hash_t)); 103 (void) topo_mod_seterrno(hdl, EMOD_NOMEM); 104 return (NULL); 105 } 106 return (r); 107 } 108 109 static void 110 did_hash_destroy(did_hash_t *ht) 111 { 112 did_t *e, *n; 113 int idx; 114 115 if (ht == NULL) 116 return; 117 for (idx = 0; idx < ht->dph_hashlen; idx++) { 118 for (e = ht->dph_hash[idx]; e != NULL; ) { 119 n = e->dp_next; 120 did_destroy(e); 121 e = n; 122 } 123 } 124 topo_mod_free(ht->dph_mod, 125 ht->dph_hash, ht->dph_hashlen * sizeof (did_t *)); 126 topo_mod_free(ht->dph_mod, ht, sizeof (did_hash_t)); 127 } 128 129 void 130 did_hash_insert(topo_mod_t *mp, di_node_t key, did_t *new) 131 { 132 did_hash_t *tab = (did_hash_t *)topo_mod_getspecific(mp); 133 did_t *assertchk; 134 int idx = did_dnhash(key) % tab->dph_hashlen; 135 136 tab->dph_nelems++; 137 did_hold(new); 138 topo_mod_dprintf(tab->dph_mod, "Insert [key=%p] into %p, bucket %d\n", 139 key, (void *)tab, idx); 140 if (tab->dph_hash[idx] == NULL) { 141 tab->dph_hash[idx] = new; 142 topo_mod_dprintf(tab->dph_mod, "first entry.\n"); 143 } else { 144 /* 145 * We should not be putting in a duplicate entry 146 */ 147 for (assertchk = tab->dph_hash[idx]; 148 assertchk != NULL; 149 assertchk = assertchk->dp_next) 150 assert(assertchk->dp_src != key); 151 new->dp_next = tab->dph_hash[idx]; 152 tab->dph_hash[idx] = new; 153 } 154 } 155 156 did_t * 157 did_hash_lookup(topo_mod_t *mp, di_node_t key) 158 { 159 did_t *e; 160 did_hash_t *tab = (did_hash_t *)topo_mod_getspecific(mp); 161 int idx = did_dnhash(key) % tab->dph_hashlen; 162 163 e = tab->dph_hash[idx]; 164 while (e != NULL) { 165 if (e->dp_src == key) { 166 did_hold(e); 167 return (e); 168 } 169 e = e->dp_next; 170 } 171 return (NULL); 172 } 173