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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: nsload - namespace loading/expanding/contracting procedures | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
1da177e4 LT |
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 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acnamesp.h" | |
47 | #include "acdispat.h" | |
48 | #include "actables.h" | |
45209046 | 49 | #include "acinterp.h" |
1da177e4 | 50 | |
1da177e4 | 51 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 52 | ACPI_MODULE_NAME("nsload") |
1da177e4 | 53 | |
44f6c012 | 54 | /* Local prototypes */ |
44f6c012 | 55 | #ifdef ACPI_FUTURE_IMPLEMENTATION |
4be44fcd | 56 | acpi_status acpi_ns_unload_namespace(acpi_handle handle); |
44f6c012 | 57 | |
4be44fcd | 58 | static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle); |
44f6c012 | 59 | #endif |
1da177e4 | 60 | |
44f6c012 | 61 | #ifndef ACPI_NO_METHOD_EXECUTION |
1da177e4 LT |
62 | /******************************************************************************* |
63 | * | |
64 | * FUNCTION: acpi_ns_load_table | |
65 | * | |
f3d2e786 | 66 | * PARAMETERS: table_index - Index for table to be loaded |
ba494bee | 67 | * node - Owning NS node |
1da177e4 LT |
68 | * |
69 | * RETURN: Status | |
70 | * | |
71 | * DESCRIPTION: Load one ACPI table into the namespace | |
72 | * | |
73 | ******************************************************************************/ | |
74 | ||
75 | acpi_status | |
67a119f9 | 76 | acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node) |
1da177e4 | 77 | { |
4be44fcd | 78 | acpi_status status; |
1da177e4 | 79 | |
b229cf92 | 80 | ACPI_FUNCTION_TRACE(ns_load_table); |
1da177e4 | 81 | |
45209046 LZ |
82 | acpi_ex_enter_interpreter(); |
83 | ||
1da177e4 LT |
84 | /* |
85 | * Parse the table and load the namespace with all named | |
73a3090a BM |
86 | * objects found within. Control methods are NOT parsed |
87 | * at this time. In fact, the control methods cannot be | |
1da177e4 LT |
88 | * parsed until the entire namespace is loaded, because |
89 | * if a control method makes a forward reference (call) | |
90 | * to another control method, we can't continue parsing | |
91 | * because we don't know how many arguments to parse next! | |
92 | */ | |
f3d2e786 BM |
93 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
94 | if (ACPI_FAILURE(status)) { | |
45209046 | 95 | goto unlock_interp; |
f3d2e786 BM |
96 | } |
97 | ||
98 | /* If table already loaded into namespace, just return */ | |
99 | ||
100 | if (acpi_tb_is_table_loaded(table_index)) { | |
101 | status = AE_ALREADY_EXISTS; | |
102 | goto unlock; | |
103 | } | |
104 | ||
4be44fcd LB |
105 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
106 | "**** Loading table into namespace ****\n")); | |
1da177e4 | 107 | |
f3d2e786 | 108 | status = acpi_tb_allocate_owner_id(table_index); |
4be44fcd | 109 | if (ACPI_FAILURE(status)) { |
f3d2e786 | 110 | goto unlock; |
1da177e4 LT |
111 | } |
112 | ||
7f4ac9f9 | 113 | status = acpi_ns_parse_table(table_index, node); |
f3d2e786 BM |
114 | if (ACPI_SUCCESS(status)) { |
115 | acpi_tb_set_table_loaded_flag(table_index, TRUE); | |
116 | } else { | |
4712f71b BM |
117 | /* |
118 | * On error, delete any namespace objects created by this table. | |
119 | * We cannot initialize these objects, so delete them. There are | |
120 | * a couple of expecially bad cases: | |
121 | * AE_ALREADY_EXISTS - namespace collision. | |
122 | * AE_NOT_FOUND - the target of a Scope operator does not | |
123 | * exist. This target of Scope must already exist in the | |
124 | * namespace, as per the ACPI specification. | |
125 | */ | |
126 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
127 | acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list. | |
128 | tables[table_index].owner_id); | |
4712f71b | 129 | |
80b28810 | 130 | acpi_tb_release_owner_id(table_index); |
4712f71b | 131 | return_ACPI_STATUS(status); |
f3d2e786 BM |
132 | } |
133 | ||
10622bf8 | 134 | unlock: |
4be44fcd | 135 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
45209046 LZ |
136 | unlock_interp: |
137 | (void)acpi_ex_exit_interpreter(); | |
1da177e4 | 138 | |
4be44fcd LB |
139 | if (ACPI_FAILURE(status)) { |
140 | return_ACPI_STATUS(status); | |
1da177e4 LT |
141 | } |
142 | ||
143 | /* | |
73a3090a | 144 | * Now we can parse the control methods. We always parse |
1da177e4 LT |
145 | * them here for a sanity check, and if configured for |
146 | * just-in-time parsing, we delete the control method | |
147 | * parse trees. | |
148 | */ | |
4be44fcd | 149 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
22b5afce | 150 | "**** Begin Table Object Initialization\n")); |
1da177e4 | 151 | |
f3d2e786 | 152 | status = acpi_ds_initialize_objects(table_index, node); |
1da177e4 | 153 | |
4be44fcd | 154 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
22b5afce | 155 | "**** Completed Table Object Initialization\n")); |
1da177e4 | 156 | |
2785ce8d BM |
157 | /* |
158 | * Execute any module-level code that was detected during the table load | |
159 | * phase. Although illegal since ACPI 2.0, there are many machines that | |
160 | * contain this type of code. Each block of detected executable AML code | |
161 | * outside of any control method is wrapped with a temporary control | |
162 | * method object and placed on a global list. The methods on this list | |
163 | * are executed below. | |
164 | * | |
165 | * This case executes the module-level code for each table immediately | |
166 | * after the table has been loaded. This provides compatibility with | |
167 | * other ACPI implementations. Optionally, the execution can be deferred | |
168 | * until later, see acpi_initialize_objects. | |
169 | */ | |
170 | if (!acpi_gbl_group_module_level_code) { | |
171 | acpi_ns_exec_module_code_list(); | |
172 | } | |
173 | ||
4be44fcd | 174 | return_ACPI_STATUS(status); |
1da177e4 LT |
175 | } |
176 | ||
f3d2e786 | 177 | #ifdef ACPI_OBSOLETE_FUNCTIONS |
1da177e4 LT |
178 | /******************************************************************************* |
179 | * | |
180 | * FUNCTION: acpi_load_namespace | |
181 | * | |
182 | * PARAMETERS: None | |
183 | * | |
184 | * RETURN: Status | |
185 | * | |
186 | * DESCRIPTION: Load the name space from what ever is pointed to by DSDT. | |
187 | * (DSDT points to either the BIOS or a buffer.) | |
188 | * | |
189 | ******************************************************************************/ | |
190 | ||
4be44fcd | 191 | acpi_status acpi_ns_load_namespace(void) |
1da177e4 | 192 | { |
4be44fcd | 193 | acpi_status status; |
1da177e4 | 194 | |
b229cf92 | 195 | ACPI_FUNCTION_TRACE(acpi_load_name_space); |
1da177e4 LT |
196 | |
197 | /* There must be at least a DSDT installed */ | |
198 | ||
199 | if (acpi_gbl_DSDT == NULL) { | |
b8e4d893 | 200 | ACPI_ERROR((AE_INFO, "DSDT is not in memory")); |
4be44fcd | 201 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
1da177e4 LT |
202 | } |
203 | ||
204 | /* | |
73a3090a | 205 | * Load the namespace. The DSDT is required, |
1da177e4 LT |
206 | * but the SSDT and PSDT tables are optional. |
207 | */ | |
b229cf92 | 208 | status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT); |
4be44fcd LB |
209 | if (ACPI_FAILURE(status)) { |
210 | return_ACPI_STATUS(status); | |
1da177e4 LT |
211 | } |
212 | ||
213 | /* Ignore exceptions from these */ | |
214 | ||
b229cf92 BM |
215 | (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT); |
216 | (void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT); | |
1da177e4 | 217 | |
4be44fcd LB |
218 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
219 | "ACPI Namespace successfully loaded at root %p\n", | |
220 | acpi_gbl_root_node)); | |
1da177e4 | 221 | |
4be44fcd | 222 | return_ACPI_STATUS(status); |
1da177e4 | 223 | } |
f3d2e786 | 224 | #endif |
1da177e4 | 225 | |
44f6c012 | 226 | #ifdef ACPI_FUTURE_IMPLEMENTATION |
1da177e4 LT |
227 | /******************************************************************************* |
228 | * | |
229 | * FUNCTION: acpi_ns_delete_subtree | |
230 | * | |
231 | * PARAMETERS: start_handle - Handle in namespace where search begins | |
232 | * | |
233 | * RETURNS Status | |
234 | * | |
235 | * DESCRIPTION: Walks the namespace starting at the given handle and deletes | |
236 | * all objects, entries, and scopes in the entire subtree. | |
237 | * | |
238 | * Namespace/Interpreter should be locked or the subsystem should | |
239 | * be in shutdown before this routine is called. | |
240 | * | |
241 | ******************************************************************************/ | |
242 | ||
4be44fcd | 243 | static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle) |
1da177e4 | 244 | { |
4be44fcd LB |
245 | acpi_status status; |
246 | acpi_handle child_handle; | |
247 | acpi_handle parent_handle; | |
248 | acpi_handle next_child_handle; | |
249 | acpi_handle dummy; | |
250 | u32 level; | |
1da177e4 | 251 | |
b229cf92 | 252 | ACPI_FUNCTION_TRACE(ns_delete_subtree); |
1da177e4 LT |
253 | |
254 | parent_handle = start_handle; | |
255 | child_handle = NULL; | |
4be44fcd | 256 | level = 1; |
1da177e4 LT |
257 | |
258 | /* | |
259 | * Traverse the tree of objects until we bubble back up | |
260 | * to where we started. | |
261 | */ | |
262 | while (level > 0) { | |
52fc0b02 | 263 | |
1da177e4 LT |
264 | /* Attempt to get the next object in this scope */ |
265 | ||
4be44fcd LB |
266 | status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle, |
267 | child_handle, &next_child_handle); | |
1da177e4 LT |
268 | |
269 | child_handle = next_child_handle; | |
270 | ||
271 | /* Did we get a new object? */ | |
272 | ||
4be44fcd | 273 | if (ACPI_SUCCESS(status)) { |
52fc0b02 | 274 | |
1da177e4 LT |
275 | /* Check if this object has any children */ |
276 | ||
4be44fcd LB |
277 | if (ACPI_SUCCESS |
278 | (acpi_get_next_object | |
279 | (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) { | |
1da177e4 LT |
280 | /* |
281 | * There is at least one child of this object, | |
282 | * visit the object | |
283 | */ | |
284 | level++; | |
285 | parent_handle = child_handle; | |
286 | child_handle = NULL; | |
287 | } | |
4be44fcd | 288 | } else { |
1da177e4 LT |
289 | /* |
290 | * No more children in this object, go back up to | |
291 | * the object's parent | |
292 | */ | |
293 | level--; | |
294 | ||
295 | /* Delete all children now */ | |
296 | ||
4be44fcd | 297 | acpi_ns_delete_children(child_handle); |
1da177e4 LT |
298 | |
299 | child_handle = parent_handle; | |
4be44fcd LB |
300 | status = acpi_get_parent(parent_handle, &parent_handle); |
301 | if (ACPI_FAILURE(status)) { | |
302 | return_ACPI_STATUS(status); | |
1da177e4 LT |
303 | } |
304 | } | |
305 | } | |
306 | ||
307 | /* Now delete the starting object, and we are done */ | |
308 | ||
8e4319c4 | 309 | acpi_ns_remove_node(child_handle); |
4be44fcd | 310 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
311 | } |
312 | ||
1da177e4 LT |
313 | /******************************************************************************* |
314 | * | |
315 | * FUNCTION: acpi_ns_unload_name_space | |
316 | * | |
ba494bee | 317 | * PARAMETERS: handle - Root of namespace subtree to be deleted |
1da177e4 LT |
318 | * |
319 | * RETURN: Status | |
320 | * | |
321 | * DESCRIPTION: Shrinks the namespace, typically in response to an undocking | |
73a3090a | 322 | * event. Deletes an entire subtree starting from (and |
1da177e4 LT |
323 | * including) the given handle. |
324 | * | |
325 | ******************************************************************************/ | |
326 | ||
4be44fcd | 327 | acpi_status acpi_ns_unload_namespace(acpi_handle handle) |
1da177e4 | 328 | { |
4be44fcd | 329 | acpi_status status; |
1da177e4 | 330 | |
b229cf92 | 331 | ACPI_FUNCTION_TRACE(ns_unload_name_space); |
1da177e4 LT |
332 | |
333 | /* Parameter validation */ | |
334 | ||
335 | if (!acpi_gbl_root_node) { | |
4be44fcd | 336 | return_ACPI_STATUS(AE_NO_NAMESPACE); |
1da177e4 LT |
337 | } |
338 | ||
339 | if (!handle) { | |
4be44fcd | 340 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
341 | } |
342 | ||
343 | /* This function does the real work */ | |
344 | ||
4be44fcd | 345 | status = acpi_ns_delete_subtree(handle); |
4be44fcd | 346 | return_ACPI_STATUS(status); |
1da177e4 | 347 | } |
44f6c012 | 348 | #endif |
1da177e4 | 349 | #endif |