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| 1 | /******************************************************************************* | |||
| 2 | * | |||
| 3 | * Module Name: nssearch - Namespace search | |||
| 4 | * | |||
| 5 | ******************************************************************************/ | |||
| 6 | ||||
| 7 | /* | |||
| 8 | * Copyright (C) 2000 - 2006, R. Byron Moore | |||
| 9 | * All rights reserved. | |||
| 10 | * | |||
| 11 | * Redistribution and use in source and binary forms, with or without | |||
| 12 | * modification, are permitted provided that the following conditions | |||
| 13 | * are met: | |||
| 14 | * 1. Redistributions of source code must retain the above copyright | |||
| 15 | * notice, this list of conditions, and the following disclaimer, | |||
| 16 | * without modification. | |||
| 17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |||
| 18 | * substantially similar to the "NO WARRANTY" disclaimer below | |||
| 19 | * ("Disclaimer") and any redistribution must be conditioned upon | |||
| 20 | * including a substantially similar Disclaimer requirement for further | |||
| 21 | * binary redistribution. | |||
| 22 | * 3. Neither the names of the above-listed copyright holders nor the names | |||
| 23 | * of any contributors may be used to endorse or promote products derived | |||
| 24 | * from this software without specific prior written permission. | |||
| 25 | * | |||
| 26 | * Alternatively, this software may be distributed under the terms of the | |||
| 27 | * GNU General Public License ("GPL") version 2 as published by the Free | |||
| 28 | * Software Foundation. | |||
| 29 | * | |||
| 30 | * NO WARRANTY | |||
| 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |||
| 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |||
| 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |||
| 34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |||
| 35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||
| 36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||
| 37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||
| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |||
| 39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |||
| 40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |||
| 41 | * POSSIBILITY OF SUCH DAMAGES. | |||
| 42 | */ | |||
| 43 | ||||
| 44 | #include <acpi/acpi.h> | |||
| 45 | #include <acpi/acnamesp.h> | |||
| 46 | ||||
| 47 | #define _COMPONENT ACPI_NAMESPACE | |||
| 48 | ACPI_MODULE_NAME("nssearch") | |||
| 49 | ||||
| 50 | /* Local prototypes */ | |||
| 51 | static acpi_status | |||
| 52 | acpi_ns_search_parent_tree(u32 target_name, | |||
| 53 | struct acpi_namespace_node *node, | |||
| 54 | acpi_object_type type, | |||
| 55 | struct acpi_namespace_node **return_node); | |||
| 56 | ||||
| 57 | /******************************************************************************* | |||
| 58 | * | |||
| 59 | * FUNCTION: acpi_ns_search_node | |||
| 60 | * | |||
| 61 | * PARAMETERS: target_name - Ascii ACPI name to search for | |||
| 62 | * Node - Starting node where search will begin | |||
| 63 | * Type - Object type to match | |||
| 64 | * return_node - Where the matched Named obj is returned | |||
| 65 | * | |||
| 66 | * RETURN: Status | |||
| 67 | * | |||
| 68 | * DESCRIPTION: Search a single level of the namespace. Performs a | |||
| 69 | * simple search of the specified level, and does not add | |||
| 70 | * entries or search parents. | |||
| 71 | * | |||
| 72 | * | |||
| 73 | * Named object lists are built (and subsequently dumped) in the | |||
| 74 | * order in which the names are encountered during the namespace load; | |||
| 75 | * | |||
| 76 | * All namespace searching is linear in this implementation, but | |||
| 77 | * could be easily modified to support any improved search | |||
| 78 | * algorithm. However, the linear search was chosen for simplicity | |||
| 79 | * and because the trees are small and the other interpreter | |||
| 80 | * execution overhead is relatively high. | |||
| 81 | * | |||
| 82 | ******************************************************************************/ | |||
| 83 | ||||
| 84 | acpi_status | |||
| 2089E3 | 0 | 85 | acpi_ns_search_node(u32 target_name, | |
| 86 | struct acpi_namespace_node *node, | |||
| 87 | acpi_object_type type, | |||
| 88 | struct acpi_namespace_node **return_node) | |||
| 89 | { | |||
| 90 | struct acpi_namespace_node *next_node; | |||
| 91 | ||||
| 92 | ACPI_FUNCTION_TRACE("ns_search_node"); | |||
| 93 | ||||
| 94 | #ifdef ACPI_DEBUG_OUTPUT | |||
| 95 | if (ACPI_LV_NAMES & acpi_dbg_level) { | |||
| 96 | char *scope_name; | |||
| 97 | ||||
| 98 | scope_name = acpi_ns_get_external_pathname(node); | |||
| 99 | if (scope_name) { | |||
| 100 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |||
| 101 | "Searching %s (%p) For [%4.4s] (%s)\n", | |||
| 102 | scope_name, node, ACPI_CAST_PTR(char, | |||
| 103 | &target_name), | |||
| 104 | acpi_ut_get_type_name(type))); | |||
| 105 | ||||
| 106 | ACPI_MEM_FREE(scope_name); | |||
| 107 | } | |||
| 108 | } | |||
| 109 | #endif | |||
| 110 | ||||
| 111 | /* | |||
| 112 | * Search for name at this namespace level, which is to say that we | |||
| 113 | * must search for the name among the children of this object | |||
| 114 | */ | |||
| 115 | next_node = node->child; | |||
| 6136E4 | 708216 | 116 | while (next_node) { | |
| 117 | /* Check for match against the name */ | |||
| 118 | ||||
| 1204E3 | 6016E4 | 119 | if (next_node->name.integer == target_name) { | |
| 120 | /* Resolve a control method alias if any */ | |||
| 121 | ||||
| 122 | if (acpi_ns_get_type(next_node) == | |||
| 0 | 1204E3 | - | 123 | ACPI_TYPE_LOCAL_METHOD_ALIAS) { |
| 124 | next_node = | |||
| 125 | ACPI_CAST_PTR(struct acpi_namespace_node, | |||
| 126 | next_node->object); | |||
| 127 | } | |||
| 128 | ||||
| 129 | /* | |||
| 130 | * Found matching entry. | |||
| 131 | */ | |||
| 132 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |||
| 133 | "Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n", | |||
| 134 | ACPI_CAST_PTR(char, &target_name), | |||
| 135 | acpi_ut_get_type_name(next_node-> | |||
| 136 | type), | |||
| 137 | next_node, | |||
| 138 | acpi_ut_get_node_name(node), node)); | |||
| 139 | ||||
| 140 | *return_node = next_node; | |||
| 1204E3 | 141 | return_ACPI_STATUS(AE_OK); | ||
| 142 | } | |||
| 143 | ||||
| 144 | /* | |||
| 145 | * The last entry in the list points back to the parent, | |||
| 146 | * so a flag is used to indicate the end-of-list | |||
| 147 | */ | |||
| 177185 | 5998E4 | 148 | if (next_node->flags & ANOBJ_END_OF_PEER_LIST) { | |
| 149 | /* Searched entire list, we are done */ | |||
| 150 | ||||
| 177185 | 151 | break; | ||
| 152 | } | |||
| 153 | ||||
| 154 | /* Didn't match name, move on to the next peer object */ | |||
| 155 | ||||
| 156 | next_node = next_node->peer; | |||
| 157 | } | |||
| 158 | ||||
| 159 | /* Searched entire namespace level, not found */ | |||
| 160 | ||||
| 161 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |||
| 162 | "Name [%4.4s] (%s) not found in search in scope [%4.4s] %p first child %p\n", | |||
| 163 | ACPI_CAST_PTR(char, &target_name), | |||
| 164 | acpi_ut_get_type_name(type), | |||
| 165 | acpi_ut_get_node_name(node), node, node->child)); | |||
| 166 | ||||
| 885401 | 167 | return_ACPI_STATUS(AE_NOT_FOUND); | ||
| 168 | } | |||
| 169 | ||||
| 170 | /******************************************************************************* | |||
| 171 | * | |||
| 172 | * FUNCTION: acpi_ns_search_parent_tree | |||
| 173 | * | |||
| 174 | * PARAMETERS: target_name - Ascii ACPI name to search for | |||
| 175 | * Node - Starting node where search will begin | |||
| 176 | * Type - Object type to match | |||
| 177 | * return_node - Where the matched Node is returned | |||
| 178 | * | |||
| 179 | * RETURN: Status | |||
| 180 | * | |||
| 181 | * DESCRIPTION: Called when a name has not been found in the current namespace | |||
| 182 | * level. Before adding it or giving up, ACPI scope rules require | |||
| 183 | * searching enclosing scopes in cases identified by acpi_ns_local(). | |||
| 184 | * | |||
| 185 | * "A name is located by finding the matching name in the current | |||
| 186 | * name space, and then in the parent name space. If the parent | |||
| 187 | * name space does not contain the name, the search continues | |||
| 188 | * recursively until either the name is found or the name space | |||
| 189 | * does not have a parent (the root of the name space). This | |||
| 190 | * indicates that the name is not found" (From ACPI Specification, | |||
| 191 | * section 5.3) | |||
| 192 | * | |||
| 193 | ******************************************************************************/ | |||
| 194 | ||||
| 195 | static acpi_status | |||
| 708186 | 0 | 196 | acpi_ns_search_parent_tree(u32 target_name, | |
| 197 | struct acpi_namespace_node *node, | |||
| 198 | acpi_object_type type, | |||
| 199 | struct acpi_namespace_node **return_node) | |||
| 200 | { | |||
| 201 | acpi_status status; | |||
| 202 | struct acpi_namespace_node *parent_node; | |||
| 203 | ||||
| 204 | ACPI_FUNCTION_TRACE("ns_search_parent_tree"); | |||
| 205 | ||||
| 206 | parent_node = acpi_ns_get_parent_node(node); | |||
| 207 | ||||
| 208 | /* | |||
| 209 | * If there is no parent (i.e., we are at the root) or type is "local", | |||
| 210 | * we won't be searching the parent tree. | |||
| 211 | */ | |||
| 0 | 708186 | - | 212 | if (!parent_node) { |
| 213 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "[%4.4s] has no parent\n", | |||
| 214 | ACPI_CAST_PTR(char, &target_name))); | |||
| 0 | - | 215 | return_ACPI_STATUS(AE_NOT_FOUND); | |
| 216 | } | |||
| 217 | ||||
| 0 | 708186 | - | 218 | if (acpi_ns_local(type)) { |
| 219 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |||
| 220 | "[%4.4s] type [%s] must be local to this scope (no parent search)\n", | |||
| 221 | ACPI_CAST_PTR(char, &target_name), | |||
| 222 | acpi_ut_get_type_name(type))); | |||
| 0 | - | 223 | return_ACPI_STATUS(AE_NOT_FOUND); | |
| 224 | } | |||
| 225 | ||||
| 226 | /* Search the parent tree */ | |||
| 227 | ||||
| 228 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |||
| 229 | "Searching parent [%4.4s] for [%4.4s]\n", | |||
| 230 | acpi_ut_get_node_name(parent_node), | |||
| 231 | ACPI_CAST_PTR(char, &target_name))); | |||
| 232 | ||||
| 233 | /* | |||
| 234 | * Search parents until target is found or we have backed up to the root | |||
| 235 | */ | |||
| 779664 | 948 | 236 | while (parent_node) { | |
| 237 | /* | |||
| 238 | * Search parent scope. Use TYPE_ANY because we don't care about the | |||
| 239 | * object type at this point, we only care about the existence of | |||
| 240 | * the actual name we are searching for. Typechecking comes later. | |||
| 241 | */ | |||
| 242 | status = acpi_ns_search_node(target_name, parent_node, | |||
| 243 | ACPI_TYPE_ANY, return_node); | |||
| 707238 | 72426 | 244 | if (ACPI_SUCCESS(status)) { | |
| 707238 | 245 | return_ACPI_STATUS(status); | ||
| 246 | } | |||
| 247 | ||||
| 248 | /* | |||
| 249 | * Not found here, go up another level | |||
| 250 | * (until we reach the root) | |||
| 251 | */ | |||
| 252 | parent_node = acpi_ns_get_parent_node(parent_node); | |||
| 253 | } | |||
| 254 | ||||
| 255 | /* Not found in parent tree */ | |||
| 256 | ||||
| 948 | 257 | return_ACPI_STATUS(AE_NOT_FOUND); | ||
| 258 | } | |||
| 259 | ||||
| 260 | /******************************************************************************* | |||
| 261 | * | |||
| 262 | * FUNCTION: acpi_ns_search_and_enter | |||
| 263 | * | |||
| 264 | * PARAMETERS: target_name - Ascii ACPI name to search for (4 chars) | |||
| 265 | * walk_state - Current state of the walk | |||
| 266 | * Node - Starting node where search will begin | |||
| 267 | * interpreter_mode - Add names only in ACPI_MODE_LOAD_PASS_x. | |||
| 268 | * Otherwise,search only. | |||
| 269 | * Type - Object type to match | |||
| 270 | * Flags - Flags describing the search restrictions | |||
| 271 | * return_node - Where the Node is returned | |||
| 272 | * | |||
| 273 | * RETURN: Status | |||
| 274 | * | |||
| 275 | * DESCRIPTION: Search for a name segment in a single namespace level, | |||
| 276 | * optionally adding it if it is not found. If the passed | |||
| 277 | * Type is not Any and the type previously stored in the | |||
| 278 | * entry was Any (i.e. unknown), update the stored type. | |||
| 279 | * | |||
| 280 | * In ACPI_IMODE_EXECUTE, search only. | |||
| 281 | * In other modes, search and add if not found. | |||
| 282 | * | |||
| 283 | ******************************************************************************/ | |||
| 284 | ||||
| 285 | acpi_status | |||
| 1309E3 | 0 | 286 | acpi_ns_search_and_enter(u32 target_name, | |
| 287 | struct acpi_walk_state *walk_state, | |||
| 288 | struct acpi_namespace_node *node, | |||
| 289 | acpi_interpreter_mode interpreter_mode, | |||
| 290 | acpi_object_type type, | |||
| 291 | u32 flags, struct acpi_namespace_node **return_node) | |||
| 292 | { | |||
| 293 | acpi_status status; | |||
| 294 | struct acpi_namespace_node *new_node; | |||
| 295 | ||||
| 296 | ACPI_FUNCTION_TRACE("ns_search_and_enter"); | |||
| 297 | ||||
| 298 | /* Parameter validation */ | |||
| 299 | ||||
| 0 | 1309E3 | - | 300 | if (!node || !target_name || !return_node) { |
| 0 | - | 300 | T || _ || _ | |
| 0 | - | 300 | F || T || _ | |
| 0 | - | 300 | F || F || T | |
| 1309E3 | 300 | F || F || F | ||
| 301 | ACPI_ERROR((AE_INFO, | |||
| 302 | "Null param: Node %p Name %X return_node %p", | |||
| 303 | node, target_name, return_node)); | |||
| 0 | - | 304 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
| 305 | } | |||
| 306 | ||||
| 307 | /* Name must consist of printable characters */ | |||
| 308 | ||||
| 0 | 1309E3 | - | 309 | if (!acpi_ut_valid_acpi_name(target_name)) { |
| 310 | ACPI_ERROR((AE_INFO, "Bad character in ACPI Name: %X", | |||
| 311 | target_name)); | |||
| 0 | - | 312 | return_ACPI_STATUS(AE_BAD_CHARACTER); | |
| 313 | } | |||
| 314 | ||||
| 315 | /* Try to find the name in the namespace level specified by the caller */ | |||
| 316 | ||||
| 317 | *return_node = ACPI_ENTRY_NOT_FOUND; | |||
| 318 | status = acpi_ns_search_node(target_name, node, type, return_node); | |||
| 497308 | 812591 | 319 | if (status != AE_NOT_FOUND) { | |
| 320 | /* | |||
| 321 | * If we found it AND the request specifies that a find is an error, | |||
| 322 | * return the error | |||
| 323 | */ | |||
| 0 | 497308 | - | 324 | if ((status == AE_OK) && (flags & ACPI_NS_ERROR_IF_FOUND)) { |
| 0 | - | 324 | (T) && (T) | |
| 497308 | 324 | (T) && (F) | ||
| 0 | - | 324 | (F) && (_) | |
| 325 | status = AE_ALREADY_EXISTS; | |||
| 326 | } | |||
| 327 | ||||
| 328 | /* | |||
| 329 | * Either found it or there was an error | |||
| 330 | * -- finished either way | |||
| 331 | */ | |||
| 497308 | 332 | return_ACPI_STATUS(status); | ||
| 333 | } | |||
| 334 | ||||
| 335 | /* | |||
| 336 | * The name was not found. If we are NOT performing the first pass | |||
| 337 | * (name entry) of loading the namespace, search the parent tree (all the | |||
| 338 | * way to the root if necessary.) We don't want to perform the parent | |||
| 339 | * search when the namespace is actually being loaded. We want to perform | |||
| 340 | * the search when namespace references are being resolved (load pass 2) | |||
| 341 | * and during the execution phase. | |||
| 342 | */ | |||
| 343 | if ((interpreter_mode != ACPI_IMODE_LOAD_PASS1) && | |||
| 708186 | 104405 | 344 | (flags & ACPI_NS_SEARCH_PARENT)) { | |
| 708186 | 344 | (T) && (T) | ||
| 100049 | 344 | (T) && (F) | ||
| 4356 | 344 | (F) && (_) | ||
| 345 | /* | |||
| 346 | * Not found at this level - search parent tree according to the | |||
| 347 | * ACPI specification | |||
| 348 | */ | |||
| 349 | status = | |||
| 350 | acpi_ns_search_parent_tree(target_name, node, type, | |||
| 351 | return_node); | |||
| 707238 | 948 | 352 | if (ACPI_SUCCESS(status)) { | |
| 707238 | 353 | return_ACPI_STATUS(status); | ||
| 354 | } | |||
| 355 | } | |||
| 356 | ||||
| 357 | /* | |||
| 358 | * In execute mode, just search, never add names. Exit now. | |||
| 359 | */ | |||
| 100883 | 4470 | 360 | if (interpreter_mode == ACPI_IMODE_EXECUTE) { | |
| 361 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |||
| 362 | "%4.4s Not found in %p [Not adding]\n", | |||
| 363 | ACPI_CAST_PTR(char, &target_name), node)); | |||
| 364 | ||||
| 100883 | 365 | return_ACPI_STATUS(AE_NOT_FOUND); | ||
| 366 | } | |||
| 367 | ||||
| 368 | /* Create the new named object */ | |||
| 369 | ||||
| 370 | new_node = acpi_ns_create_node(target_name); | |||
| 0 | 4470 | - | 371 | if (!new_node) { |
| 0 | - | 372 | return_ACPI_STATUS(AE_NO_MEMORY); | |
| 373 | } | |||
| 374 | ||||
| 375 | /* Install the new object into the parent's list of children */ | |||
| 376 | ||||
| 377 | acpi_ns_install_node(walk_state, node, new_node, type); | |||
| 378 | *return_node = new_node; | |||
| 379 | ||||
| 4470 | 380 | return_ACPI_STATUS(AE_OK); | ||
| 381 | } | |||
| ***TER 71% (42/59) of SOURCE FILE nssearch.c | ||||