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1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: nssearch - Namespace search | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2005, 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 | ||
45 | #include <acpi/acpi.h> | |
46 | #include <acpi/acnamesp.h> | |
47 | ||
48 | ||
49 | #define _COMPONENT ACPI_NAMESPACE | |
50 | ACPI_MODULE_NAME ("nssearch") | |
51 | ||
52 | ||
53 | /******************************************************************************* | |
54 | * | |
55 | * FUNCTION: acpi_ns_search_node | |
56 | * | |
57 | * PARAMETERS: *target_name - Ascii ACPI name to search for | |
58 | * *Node - Starting node where search will begin | |
59 | * Type - Object type to match | |
60 | * **return_node - Where the matched Named obj is returned | |
61 | * | |
62 | * RETURN: Status | |
63 | * | |
64 | * DESCRIPTION: Search a single level of the namespace. Performs a | |
65 | * simple search of the specified level, and does not add | |
66 | * entries or search parents. | |
67 | * | |
68 | * | |
69 | * Named object lists are built (and subsequently dumped) in the | |
70 | * order in which the names are encountered during the namespace load; | |
71 | * | |
72 | * All namespace searching is linear in this implementation, but | |
73 | * could be easily modified to support any improved search | |
74 | * algorithm. However, the linear search was chosen for simplicity | |
75 | * and because the trees are small and the other interpreter | |
76 | * execution overhead is relatively high. | |
77 | * | |
78 | ******************************************************************************/ | |
79 | ||
80 | acpi_status | |
81 | acpi_ns_search_node ( | |
82 | u32 target_name, | |
83 | struct acpi_namespace_node *node, | |
84 | acpi_object_type type, | |
85 | struct acpi_namespace_node **return_node) | |
86 | { | |
87 | struct acpi_namespace_node *next_node; | |
88 | ||
89 | ||
90 | ACPI_FUNCTION_TRACE ("ns_search_node"); | |
91 | ||
92 | ||
93 | #ifdef ACPI_DEBUG_OUTPUT | |
94 | if (ACPI_LV_NAMES & acpi_dbg_level) { | |
95 | char *scope_name; | |
96 | ||
97 | scope_name = acpi_ns_get_external_pathname (node); | |
98 | if (scope_name) { | |
99 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
100 | "Searching %s (%p) For [%4.4s] (%s)\n", | |
101 | scope_name, node, (char *) &target_name, | |
102 | acpi_ut_get_type_name (type))); | |
103 | ||
104 | ACPI_MEM_FREE (scope_name); | |
105 | } | |
106 | } | |
107 | #endif | |
108 | ||
109 | /* | |
110 | * Search for name at this namespace level, which is to say that we | |
111 | * must search for the name among the children of this object | |
112 | */ | |
113 | next_node = node->child; | |
114 | while (next_node) { | |
115 | /* Check for match against the name */ | |
116 | ||
117 | if (next_node->name.integer == target_name) { | |
118 | /* Resolve a control method alias if any */ | |
119 | ||
120 | if (acpi_ns_get_type (next_node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) { | |
121 | next_node = ACPI_CAST_PTR (struct acpi_namespace_node, next_node->object); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Found matching entry. | |
126 | */ | |
127 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
128 | "Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n", | |
129 | (char *) &target_name, acpi_ut_get_type_name (next_node->type), | |
130 | next_node, acpi_ut_get_node_name (node), node)); | |
131 | ||
132 | *return_node = next_node; | |
133 | return_ACPI_STATUS (AE_OK); | |
134 | } | |
135 | ||
136 | /* | |
137 | * The last entry in the list points back to the parent, | |
138 | * so a flag is used to indicate the end-of-list | |
139 | */ | |
140 | if (next_node->flags & ANOBJ_END_OF_PEER_LIST) { | |
141 | /* Searched entire list, we are done */ | |
142 | ||
143 | break; | |
144 | } | |
145 | ||
146 | /* Didn't match name, move on to the next peer object */ | |
147 | ||
148 | next_node = next_node->peer; | |
149 | } | |
150 | ||
151 | /* Searched entire namespace level, not found */ | |
152 | ||
153 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
154 | "Name [%4.4s] (%s) not found in search in scope [%4.4s] %p first child %p\n", | |
155 | (char *) &target_name, acpi_ut_get_type_name (type), | |
156 | acpi_ut_get_node_name (node), node, node->child)); | |
157 | ||
158 | return_ACPI_STATUS (AE_NOT_FOUND); | |
159 | } | |
160 | ||
161 | ||
162 | /******************************************************************************* | |
163 | * | |
164 | * FUNCTION: acpi_ns_search_parent_tree | |
165 | * | |
166 | * PARAMETERS: *target_name - Ascii ACPI name to search for | |
167 | * *Node - Starting node where search will begin | |
168 | * Type - Object type to match | |
169 | * **return_node - Where the matched Node is returned | |
170 | * | |
171 | * RETURN: Status | |
172 | * | |
173 | * DESCRIPTION: Called when a name has not been found in the current namespace | |
174 | * level. Before adding it or giving up, ACPI scope rules require | |
175 | * searching enclosing scopes in cases identified by acpi_ns_local(). | |
176 | * | |
177 | * "A name is located by finding the matching name in the current | |
178 | * name space, and then in the parent name space. If the parent | |
179 | * name space does not contain the name, the search continues | |
180 | * recursively until either the name is found or the name space | |
181 | * does not have a parent (the root of the name space). This | |
182 | * indicates that the name is not found" (From ACPI Specification, | |
183 | * section 5.3) | |
184 | * | |
185 | ******************************************************************************/ | |
186 | ||
187 | static acpi_status | |
188 | acpi_ns_search_parent_tree ( | |
189 | u32 target_name, | |
190 | struct acpi_namespace_node *node, | |
191 | acpi_object_type type, | |
192 | struct acpi_namespace_node **return_node) | |
193 | { | |
194 | acpi_status status; | |
195 | struct acpi_namespace_node *parent_node; | |
196 | ||
197 | ||
198 | ACPI_FUNCTION_TRACE ("ns_search_parent_tree"); | |
199 | ||
200 | ||
201 | parent_node = acpi_ns_get_parent_node (node); | |
202 | ||
203 | /* | |
204 | * If there is no parent (i.e., we are at the root) or type is "local", | |
205 | * we won't be searching the parent tree. | |
206 | */ | |
207 | if (!parent_node) { | |
208 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "[%4.4s] has no parent\n", | |
209 | (char *) &target_name)); | |
210 | return_ACPI_STATUS (AE_NOT_FOUND); | |
211 | } | |
212 | ||
213 | if (acpi_ns_local (type)) { | |
214 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
215 | "[%4.4s] type [%s] must be local to this scope (no parent search)\n", | |
216 | (char *) &target_name, acpi_ut_get_type_name (type))); | |
217 | return_ACPI_STATUS (AE_NOT_FOUND); | |
218 | } | |
219 | ||
220 | /* Search the parent tree */ | |
221 | ||
222 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
223 | "Searching parent [%4.4s] for [%4.4s]\n", | |
224 | acpi_ut_get_node_name (parent_node), (char *) &target_name)); | |
225 | ||
226 | /* | |
227 | * Search parents until target is found or we have backed up to the root | |
228 | */ | |
229 | while (parent_node) { | |
230 | /* | |
231 | * Search parent scope. Use TYPE_ANY because we don't care about the | |
232 | * object type at this point, we only care about the existence of | |
233 | * the actual name we are searching for. Typechecking comes later. | |
234 | */ | |
235 | status = acpi_ns_search_node (target_name, parent_node, | |
236 | ACPI_TYPE_ANY, return_node); | |
237 | if (ACPI_SUCCESS (status)) { | |
238 | return_ACPI_STATUS (status); | |
239 | } | |
240 | ||
241 | /* | |
242 | * Not found here, go up another level | |
243 | * (until we reach the root) | |
244 | */ | |
245 | parent_node = acpi_ns_get_parent_node (parent_node); | |
246 | } | |
247 | ||
248 | /* Not found in parent tree */ | |
249 | ||
250 | return_ACPI_STATUS (AE_NOT_FOUND); | |
251 | } | |
252 | ||
253 | ||
254 | /******************************************************************************* | |
255 | * | |
256 | * FUNCTION: acpi_ns_search_and_enter | |
257 | * | |
258 | * PARAMETERS: target_name - Ascii ACPI name to search for (4 chars) | |
259 | * walk_state - Current state of the walk | |
260 | * *Node - Starting node where search will begin | |
261 | * interpreter_mode - Add names only in ACPI_MODE_LOAD_PASS_x. | |
262 | * Otherwise,search only. | |
263 | * Type - Object type to match | |
264 | * Flags - Flags describing the search restrictions | |
265 | * **return_node - Where the Node is returned | |
266 | * | |
267 | * RETURN: Status | |
268 | * | |
269 | * DESCRIPTION: Search for a name segment in a single namespace level, | |
270 | * optionally adding it if it is not found. If the passed | |
271 | * Type is not Any and the type previously stored in the | |
272 | * entry was Any (i.e. unknown), update the stored type. | |
273 | * | |
274 | * In ACPI_IMODE_EXECUTE, search only. | |
275 | * In other modes, search and add if not found. | |
276 | * | |
277 | ******************************************************************************/ | |
278 | ||
279 | acpi_status | |
280 | acpi_ns_search_and_enter ( | |
281 | u32 target_name, | |
282 | struct acpi_walk_state *walk_state, | |
283 | struct acpi_namespace_node *node, | |
284 | acpi_interpreter_mode interpreter_mode, | |
285 | acpi_object_type type, | |
286 | u32 flags, | |
287 | struct acpi_namespace_node **return_node) | |
288 | { | |
289 | acpi_status status; | |
290 | struct acpi_namespace_node *new_node; | |
291 | ||
292 | ||
293 | ACPI_FUNCTION_TRACE ("ns_search_and_enter"); | |
294 | ||
295 | ||
296 | /* Parameter validation */ | |
297 | ||
298 | if (!node || !target_name || !return_node) { | |
299 | ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, | |
300 | "Null param: Node %p Name %X return_node %p\n", | |
301 | node, target_name, return_node)); | |
302 | ||
303 | ACPI_REPORT_ERROR (("ns_search_and_enter: Null parameter\n")); | |
304 | return_ACPI_STATUS (AE_BAD_PARAMETER); | |
305 | } | |
306 | ||
307 | /* Name must consist of printable characters */ | |
308 | ||
309 | if (!acpi_ut_valid_acpi_name (target_name)) { | |
310 | ACPI_REPORT_ERROR (("ns_search_and_enter: Bad character in ACPI Name: %X\n", | |
311 | target_name)); | |
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); | |
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 | */ | |
324 | if ((status == AE_OK) && | |
325 | (flags & ACPI_NS_ERROR_IF_FOUND)) { | |
326 | status = AE_ALREADY_EXISTS; | |
327 | } | |
328 | ||
329 | /* | |
330 | * Either found it or there was an error | |
331 | * -- finished either way | |
332 | */ | |
333 | return_ACPI_STATUS (status); | |
334 | } | |
335 | ||
336 | /* | |
337 | * The name was not found. If we are NOT performing the first pass | |
338 | * (name entry) of loading the namespace, search the parent tree (all the | |
339 | * way to the root if necessary.) We don't want to perform the parent | |
340 | * search when the namespace is actually being loaded. We want to perform | |
341 | * the search when namespace references are being resolved (load pass 2) | |
342 | * and during the execution phase. | |
343 | */ | |
344 | if ((interpreter_mode != ACPI_IMODE_LOAD_PASS1) && | |
345 | (flags & ACPI_NS_SEARCH_PARENT)) { | |
346 | /* | |
347 | * Not found at this level - search parent tree according to the | |
348 | * ACPI specification | |
349 | */ | |
350 | status = acpi_ns_search_parent_tree (target_name, node, type, return_node); | |
351 | if (ACPI_SUCCESS (status)) { | |
352 | return_ACPI_STATUS (status); | |
353 | } | |
354 | } | |
355 | ||
356 | /* | |
357 | * In execute mode, just search, never add names. Exit now. | |
358 | */ | |
359 | if (interpreter_mode == ACPI_IMODE_EXECUTE) { | |
360 | ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, | |
361 | "%4.4s Not found in %p [Not adding]\n", | |
362 | (char *) &target_name, node)); | |
363 | ||
364 | return_ACPI_STATUS (AE_NOT_FOUND); | |
365 | } | |
366 | ||
367 | /* Create the new named object */ | |
368 | ||
369 | new_node = acpi_ns_create_node (target_name); | |
370 | if (!new_node) { | |
371 | return_ACPI_STATUS (AE_NO_MEMORY); | |
372 | } | |
373 | ||
374 | /* Install the new object into the parent's list of children */ | |
375 | ||
376 | acpi_ns_install_node (walk_state, node, new_node, type); | |
377 | *return_node = new_node; | |
378 | ||
379 | return_ACPI_STATUS (AE_OK); | |
380 | } | |
381 |