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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
3 | * Module Name: nsalloc - Namespace allocation and deletion utilities | |
4 | * | |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
a8357b0c | 8 | * Copyright (C) 2000 - 2010, 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" | |
1da177e4 | 47 | |
1da177e4 | 48 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 49 | ACPI_MODULE_NAME("nsalloc") |
1da177e4 | 50 | |
1da177e4 LT |
51 | /******************************************************************************* |
52 | * | |
53 | * FUNCTION: acpi_ns_create_node | |
54 | * | |
44f6c012 | 55 | * PARAMETERS: Name - Name of the new node (4 char ACPI name) |
1da177e4 | 56 | * |
44f6c012 | 57 | * RETURN: New namespace node (Null on failure) |
1da177e4 LT |
58 | * |
59 | * DESCRIPTION: Create a namespace node | |
60 | * | |
61 | ******************************************************************************/ | |
4be44fcd | 62 | struct acpi_namespace_node *acpi_ns_create_node(u32 name) |
1da177e4 | 63 | { |
4be44fcd | 64 | struct acpi_namespace_node *node; |
afbb9e65 VP |
65 | #ifdef ACPI_DBG_TRACK_ALLOCATIONS |
66 | u32 temp; | |
67 | #endif | |
1da177e4 | 68 | |
b229cf92 | 69 | ACPI_FUNCTION_TRACE(ns_create_node); |
1da177e4 | 70 | |
61686124 | 71 | node = acpi_os_acquire_object(acpi_gbl_namespace_cache); |
1da177e4 | 72 | if (!node) { |
4be44fcd | 73 | return_PTR(NULL); |
1da177e4 LT |
74 | } |
75 | ||
4be44fcd | 76 | ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_allocated++); |
1da177e4 | 77 | |
afbb9e65 | 78 | #ifdef ACPI_DBG_TRACK_ALLOCATIONS |
d4913dc6 | 79 | temp = acpi_gbl_ns_node_list->total_allocated - |
afbb9e65 VP |
80 | acpi_gbl_ns_node_list->total_freed; |
81 | if (temp > acpi_gbl_ns_node_list->max_occupied) { | |
82 | acpi_gbl_ns_node_list->max_occupied = temp; | |
83 | } | |
84 | #endif | |
85 | ||
4be44fcd | 86 | node->name.integer = name; |
4be44fcd | 87 | ACPI_SET_DESCRIPTOR_TYPE(node, ACPI_DESC_TYPE_NAMED); |
4be44fcd | 88 | return_PTR(node); |
1da177e4 LT |
89 | } |
90 | ||
1da177e4 LT |
91 | /******************************************************************************* |
92 | * | |
93 | * FUNCTION: acpi_ns_delete_node | |
94 | * | |
95 | * PARAMETERS: Node - Node to be deleted | |
96 | * | |
97 | * RETURN: None | |
98 | * | |
8e4319c4 BM |
99 | * DESCRIPTION: Delete a namespace node. All node deletions must come through |
100 | * here. Detaches any attached objects, including any attached | |
101 | * data. If a handler is associated with attached data, it is | |
102 | * invoked before the node is deleted. | |
1da177e4 LT |
103 | * |
104 | ******************************************************************************/ | |
105 | ||
4be44fcd | 106 | void acpi_ns_delete_node(struct acpi_namespace_node *node) |
8e4319c4 BM |
107 | { |
108 | union acpi_operand_object *obj_desc; | |
109 | ||
110 | ACPI_FUNCTION_NAME(ns_delete_node); | |
111 | ||
112 | /* Detach an object if there is one */ | |
113 | ||
114 | acpi_ns_detach_object(node); | |
115 | ||
116 | /* | |
117 | * Delete an attached data object if present (an object that was created | |
118 | * and attached via acpi_attach_data). Note: After any normal object is | |
119 | * detached above, the only possible remaining object is a data object. | |
120 | */ | |
121 | obj_desc = node->object; | |
122 | if (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) { | |
123 | ||
124 | /* Invoke the attached data deletion handler if present */ | |
125 | ||
126 | if (obj_desc->data.handler) { | |
127 | obj_desc->data.handler(node, obj_desc->data.pointer); | |
128 | } | |
129 | ||
130 | acpi_ut_remove_reference(obj_desc); | |
131 | } | |
132 | ||
133 | /* Now we can delete the node */ | |
134 | ||
135 | (void)acpi_os_release_object(acpi_gbl_namespace_cache, node); | |
136 | ||
137 | ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++); | |
138 | ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Node %p, Remaining %X\n", | |
139 | node, acpi_gbl_current_node_count)); | |
140 | } | |
141 | ||
142 | /******************************************************************************* | |
143 | * | |
144 | * FUNCTION: acpi_ns_remove_node | |
145 | * | |
146 | * PARAMETERS: Node - Node to be removed/deleted | |
147 | * | |
148 | * RETURN: None | |
149 | * | |
150 | * DESCRIPTION: Remove (unlink) and delete a namespace node | |
151 | * | |
152 | ******************************************************************************/ | |
153 | ||
154 | void acpi_ns_remove_node(struct acpi_namespace_node *node) | |
1da177e4 | 155 | { |
4be44fcd LB |
156 | struct acpi_namespace_node *parent_node; |
157 | struct acpi_namespace_node *prev_node; | |
158 | struct acpi_namespace_node *next_node; | |
1da177e4 | 159 | |
8e4319c4 | 160 | ACPI_FUNCTION_TRACE_PTR(ns_remove_node, node); |
1da177e4 | 161 | |
4be44fcd | 162 | parent_node = acpi_ns_get_parent_node(node); |
1da177e4 LT |
163 | |
164 | prev_node = NULL; | |
165 | next_node = parent_node->child; | |
166 | ||
167 | /* Find the node that is the previous peer in the parent's child list */ | |
168 | ||
169 | while (next_node != node) { | |
170 | prev_node = next_node; | |
171 | next_node = prev_node->peer; | |
172 | } | |
173 | ||
174 | if (prev_node) { | |
52fc0b02 | 175 | |
1da177e4 LT |
176 | /* Node is not first child, unlink it */ |
177 | ||
178 | prev_node->peer = next_node->peer; | |
179 | if (next_node->flags & ANOBJ_END_OF_PEER_LIST) { | |
180 | prev_node->flags |= ANOBJ_END_OF_PEER_LIST; | |
181 | } | |
4be44fcd | 182 | } else { |
1da177e4 LT |
183 | /* Node is first child (has no previous peer) */ |
184 | ||
185 | if (next_node->flags & ANOBJ_END_OF_PEER_LIST) { | |
52fc0b02 | 186 | |
1da177e4 LT |
187 | /* No peers at all */ |
188 | ||
189 | parent_node->child = NULL; | |
4be44fcd | 190 | } else { /* Link peer list to parent */ |
1da177e4 LT |
191 | |
192 | parent_node->child = next_node->peer; | |
193 | } | |
194 | } | |
195 | ||
8e4319c4 | 196 | /* Delete the node and any attached objects */ |
d4913dc6 | 197 | |
8e4319c4 | 198 | acpi_ns_delete_node(node); |
1da177e4 LT |
199 | return_VOID; |
200 | } | |
201 | ||
1da177e4 LT |
202 | /******************************************************************************* |
203 | * | |
204 | * FUNCTION: acpi_ns_install_node | |
205 | * | |
206 | * PARAMETERS: walk_state - Current state of the walk | |
207 | * parent_node - The parent of the new Node | |
208 | * Node - The new Node to install | |
209 | * Type - ACPI object type of the new Node | |
210 | * | |
211 | * RETURN: None | |
212 | * | |
213 | * DESCRIPTION: Initialize a new namespace node and install it amongst | |
214 | * its peers. | |
215 | * | |
0c9938cc RM |
216 | * Note: Current namespace lookup is linear search. This appears |
217 | * to be sufficient as namespace searches consume only a small | |
218 | * fraction of the execution time of the ACPI subsystem. | |
1da177e4 LT |
219 | * |
220 | ******************************************************************************/ | |
221 | ||
4be44fcd LB |
222 | void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namespace_node *parent_node, /* Parent */ |
223 | struct acpi_namespace_node *node, /* New Child */ | |
224 | acpi_object_type type) | |
1da177e4 | 225 | { |
4be44fcd LB |
226 | acpi_owner_id owner_id = 0; |
227 | struct acpi_namespace_node *child_node; | |
1da177e4 | 228 | |
b229cf92 | 229 | ACPI_FUNCTION_TRACE(ns_install_node); |
1da177e4 LT |
230 | |
231 | /* | |
d4913dc6 BM |
232 | * Get the owner ID from the Walk state. The owner ID is used to track |
233 | * table deletion and deletion of objects created by methods. | |
1da177e4 LT |
234 | */ |
235 | if (walk_state) { | |
236 | owner_id = walk_state->owner_id; | |
237 | } | |
238 | ||
239 | /* Link the new entry into the parent and existing children */ | |
240 | ||
241 | child_node = parent_node->child; | |
242 | if (!child_node) { | |
243 | parent_node->child = node; | |
244 | node->flags |= ANOBJ_END_OF_PEER_LIST; | |
245 | node->peer = parent_node; | |
4be44fcd | 246 | } else { |
1da177e4 LT |
247 | while (!(child_node->flags & ANOBJ_END_OF_PEER_LIST)) { |
248 | child_node = child_node->peer; | |
249 | } | |
250 | ||
251 | child_node->peer = node; | |
252 | ||
253 | /* Clear end-of-list flag */ | |
254 | ||
255 | child_node->flags &= ~ANOBJ_END_OF_PEER_LIST; | |
0c9938cc | 256 | node->flags |= ANOBJ_END_OF_PEER_LIST; |
1da177e4 | 257 | node->peer = parent_node; |
1da177e4 LT |
258 | } |
259 | ||
260 | /* Init the new entry */ | |
261 | ||
262 | node->owner_id = owner_id; | |
263 | node->type = (u8) type; | |
264 | ||
4be44fcd LB |
265 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, |
266 | "%4.4s (%s) [Node %p Owner %X] added to %4.4s (%s) [Node %p]\n", | |
267 | acpi_ut_get_node_name(node), | |
268 | acpi_ut_get_type_name(node->type), node, owner_id, | |
269 | acpi_ut_get_node_name(parent_node), | |
270 | acpi_ut_get_type_name(parent_node->type), | |
271 | parent_node)); | |
793c2388 BM |
272 | |
273 | return_VOID; | |
1da177e4 LT |
274 | } |
275 | ||
1da177e4 LT |
276 | /******************************************************************************* |
277 | * | |
278 | * FUNCTION: acpi_ns_delete_children | |
279 | * | |
280 | * PARAMETERS: parent_node - Delete this objects children | |
281 | * | |
282 | * RETURN: None. | |
283 | * | |
284 | * DESCRIPTION: Delete all children of the parent object. In other words, | |
285 | * deletes a "scope". | |
286 | * | |
287 | ******************************************************************************/ | |
288 | ||
4be44fcd | 289 | void acpi_ns_delete_children(struct acpi_namespace_node *parent_node) |
1da177e4 | 290 | { |
4be44fcd LB |
291 | struct acpi_namespace_node *child_node; |
292 | struct acpi_namespace_node *next_node; | |
4be44fcd | 293 | u8 flags; |
1da177e4 | 294 | |
b229cf92 | 295 | ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node); |
1da177e4 LT |
296 | |
297 | if (!parent_node) { | |
298 | return_VOID; | |
299 | } | |
300 | ||
301 | /* If no children, all done! */ | |
302 | ||
303 | child_node = parent_node->child; | |
304 | if (!child_node) { | |
305 | return_VOID; | |
306 | } | |
307 | ||
d4913dc6 BM |
308 | /* Deallocate all children at this level */ |
309 | ||
1da177e4 | 310 | do { |
52fc0b02 | 311 | |
1da177e4 LT |
312 | /* Get the things we need */ |
313 | ||
4be44fcd LB |
314 | next_node = child_node->peer; |
315 | flags = child_node->flags; | |
1da177e4 LT |
316 | |
317 | /* Grandchildren should have all been deleted already */ | |
318 | ||
319 | if (child_node->child) { | |
b8e4d893 BM |
320 | ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p", |
321 | parent_node, child_node)); | |
1da177e4 LT |
322 | } |
323 | ||
8e4319c4 BM |
324 | /* |
325 | * Delete this child node and move on to the next child in the list. | |
326 | * No need to unlink the node since we are deleting the entire branch. | |
327 | */ | |
328 | acpi_ns_delete_node(child_node); | |
1da177e4 LT |
329 | child_node = next_node; |
330 | ||
331 | } while (!(flags & ANOBJ_END_OF_PEER_LIST)); | |
332 | ||
1da177e4 LT |
333 | /* Clear the parent's child pointer */ |
334 | ||
335 | parent_node->child = NULL; | |
1da177e4 LT |
336 | return_VOID; |
337 | } | |
338 | ||
1da177e4 LT |
339 | /******************************************************************************* |
340 | * | |
341 | * FUNCTION: acpi_ns_delete_namespace_subtree | |
342 | * | |
343 | * PARAMETERS: parent_node - Root of the subtree to be deleted | |
344 | * | |
345 | * RETURN: None. | |
346 | * | |
347 | * DESCRIPTION: Delete a subtree of the namespace. This includes all objects | |
348 | * stored within the subtree. | |
349 | * | |
350 | ******************************************************************************/ | |
351 | ||
4be44fcd | 352 | void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node) |
1da177e4 | 353 | { |
4be44fcd LB |
354 | struct acpi_namespace_node *child_node = NULL; |
355 | u32 level = 1; | |
1da177e4 | 356 | |
b229cf92 | 357 | ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree); |
1da177e4 LT |
358 | |
359 | if (!parent_node) { | |
360 | return_VOID; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Traverse the tree of objects until we bubble back up | |
365 | * to where we started. | |
366 | */ | |
367 | while (level > 0) { | |
52fc0b02 | 368 | |
1da177e4 LT |
369 | /* Get the next node in this scope (NULL if none) */ |
370 | ||
8c725bf9 | 371 | child_node = acpi_ns_get_next_node(parent_node, child_node); |
1da177e4 | 372 | if (child_node) { |
52fc0b02 | 373 | |
1da177e4 LT |
374 | /* Found a child node - detach any attached object */ |
375 | ||
4be44fcd | 376 | acpi_ns_detach_object(child_node); |
1da177e4 LT |
377 | |
378 | /* Check if this node has any children */ | |
379 | ||
8c725bf9 | 380 | if (child_node->child) { |
1da177e4 LT |
381 | /* |
382 | * There is at least one child of this node, | |
383 | * visit the node | |
384 | */ | |
385 | level++; | |
386 | parent_node = child_node; | |
387 | child_node = NULL; | |
388 | } | |
4be44fcd | 389 | } else { |
1da177e4 LT |
390 | /* |
391 | * No more children of this parent node. | |
392 | * Move up to the grandparent. | |
393 | */ | |
394 | level--; | |
395 | ||
396 | /* | |
397 | * Now delete all of the children of this parent | |
398 | * all at the same time. | |
399 | */ | |
4be44fcd | 400 | acpi_ns_delete_children(parent_node); |
1da177e4 LT |
401 | |
402 | /* New "last child" is this parent node */ | |
403 | ||
404 | child_node = parent_node; | |
405 | ||
406 | /* Move up the tree to the grandparent */ | |
407 | ||
4be44fcd | 408 | parent_node = acpi_ns_get_parent_node(parent_node); |
1da177e4 LT |
409 | } |
410 | } | |
411 | ||
412 | return_VOID; | |
413 | } | |
414 | ||
1da177e4 LT |
415 | /******************************************************************************* |
416 | * | |
417 | * FUNCTION: acpi_ns_delete_namespace_by_owner | |
418 | * | |
419 | * PARAMETERS: owner_id - All nodes with this owner will be deleted | |
420 | * | |
421 | * RETURN: Status | |
422 | * | |
423 | * DESCRIPTION: Delete entries within the namespace that are owned by a | |
424 | * specific ID. Used to delete entire ACPI tables. All | |
425 | * reference counts are updated. | |
426 | * | |
f6dd9221 BM |
427 | * MUTEX: Locks namespace during deletion walk. |
428 | * | |
1da177e4 LT |
429 | ******************************************************************************/ |
430 | ||
4be44fcd | 431 | void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id) |
1da177e4 | 432 | { |
4be44fcd LB |
433 | struct acpi_namespace_node *child_node; |
434 | struct acpi_namespace_node *deletion_node; | |
4be44fcd | 435 | struct acpi_namespace_node *parent_node; |
f6dd9221 BM |
436 | u32 level; |
437 | acpi_status status; | |
1da177e4 | 438 | |
b229cf92 | 439 | ACPI_FUNCTION_TRACE_U32(ns_delete_namespace_by_owner, owner_id); |
1da177e4 | 440 | |
0c9938cc RM |
441 | if (owner_id == 0) { |
442 | return_VOID; | |
443 | } | |
444 | ||
f6dd9221 BM |
445 | /* Lock namespace for possible update */ |
446 | ||
447 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); | |
448 | if (ACPI_FAILURE(status)) { | |
449 | return_VOID; | |
450 | } | |
451 | ||
61686124 | 452 | deletion_node = NULL; |
4be44fcd LB |
453 | parent_node = acpi_gbl_root_node; |
454 | child_node = NULL; | |
4be44fcd | 455 | level = 1; |
1da177e4 LT |
456 | |
457 | /* | |
458 | * Traverse the tree of nodes until we bubble back up | |
459 | * to where we started. | |
460 | */ | |
461 | while (level > 0) { | |
462 | /* | |
463 | * Get the next child of this parent node. When child_node is NULL, | |
464 | * the first child of the parent is returned | |
465 | */ | |
8c725bf9 | 466 | child_node = acpi_ns_get_next_node(parent_node, child_node); |
1da177e4 LT |
467 | |
468 | if (deletion_node) { | |
61686124 | 469 | acpi_ns_delete_children(deletion_node); |
8e4319c4 | 470 | acpi_ns_remove_node(deletion_node); |
1da177e4 LT |
471 | deletion_node = NULL; |
472 | } | |
473 | ||
474 | if (child_node) { | |
475 | if (child_node->owner_id == owner_id) { | |
52fc0b02 | 476 | |
1da177e4 LT |
477 | /* Found a matching child node - detach any attached object */ |
478 | ||
4be44fcd | 479 | acpi_ns_detach_object(child_node); |
1da177e4 LT |
480 | } |
481 | ||
482 | /* Check if this node has any children */ | |
483 | ||
8c725bf9 | 484 | if (child_node->child) { |
1da177e4 LT |
485 | /* |
486 | * There is at least one child of this node, | |
487 | * visit the node | |
488 | */ | |
489 | level++; | |
490 | parent_node = child_node; | |
491 | child_node = NULL; | |
4be44fcd | 492 | } else if (child_node->owner_id == owner_id) { |
1da177e4 LT |
493 | deletion_node = child_node; |
494 | } | |
4be44fcd | 495 | } else { |
1da177e4 LT |
496 | /* |
497 | * No more children of this parent node. | |
498 | * Move up to the grandparent. | |
499 | */ | |
500 | level--; | |
501 | if (level != 0) { | |
502 | if (parent_node->owner_id == owner_id) { | |
503 | deletion_node = parent_node; | |
504 | } | |
505 | } | |
506 | ||
507 | /* New "last child" is this parent node */ | |
508 | ||
509 | child_node = parent_node; | |
510 | ||
511 | /* Move up the tree to the grandparent */ | |
512 | ||
4be44fcd | 513 | parent_node = acpi_ns_get_parent_node(parent_node); |
1da177e4 LT |
514 | } |
515 | } | |
516 | ||
f6dd9221 | 517 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 LT |
518 | return_VOID; |
519 | } |