1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /*******************************************************************************
3 *
4 * Module Name: nsalloc - Namespace allocation and deletion utilities
5 *
6 ******************************************************************************/
7
8 #include <acpi/acpi.h>
9 #include "accommon.h"
10 #include "acnamesp.h"
11
12 #define _COMPONENT ACPI_NAMESPACE
13 ACPI_MODULE_NAME("nsalloc")
14
15 /*******************************************************************************
16 *
17 * FUNCTION: acpi_ns_create_node
18 *
19 * PARAMETERS: name - Name of the new node (4 char ACPI name)
20 *
21 * RETURN: New namespace node (Null on failure)
22 *
23 * DESCRIPTION: Create a namespace node
24 *
25 ******************************************************************************/
26 struct acpi_namespace_node *acpi_ns_create_node(u32 name)
27 {
28 struct acpi_namespace_node *node;
29 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
30 u32 temp;
31 #endif
32
33 ACPI_FUNCTION_TRACE(ns_create_node);
34
35 node = acpi_os_acquire_object(acpi_gbl_namespace_cache);
36 if (!node) {
37 return_PTR(NULL);
38 }
39
40 ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_allocated++);
41
42 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
43 temp = acpi_gbl_ns_node_list->total_allocated -
44 acpi_gbl_ns_node_list->total_freed;
45 if (temp > acpi_gbl_ns_node_list->max_occupied) {
46 acpi_gbl_ns_node_list->max_occupied = temp;
47 }
48 #endif
49
50 node->name.integer = name;
51 ACPI_SET_DESCRIPTOR_TYPE(node, ACPI_DESC_TYPE_NAMED);
52 return_PTR(node);
53 }
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_ns_delete_node
58 *
59 * PARAMETERS: node - Node to be deleted
60 *
61 * RETURN: None
62 *
63 * DESCRIPTION: Delete a namespace node. All node deletions must come through
64 * here. Detaches any attached objects, including any attached
65 * data. If a handler is associated with attached data, it is
66 * invoked before the node is deleted.
67 *
68 ******************************************************************************/
69
70 void acpi_ns_delete_node(struct acpi_namespace_node *node)
71 {
72 union acpi_operand_object *obj_desc;
73 union acpi_operand_object *next_desc;
74
75 ACPI_FUNCTION_NAME(ns_delete_node);
76
77 if (!node) {
78 return_VOID;
79 }
80
81 /* Detach an object if there is one */
82
83 acpi_ns_detach_object(node);
84
85 /*
86 * Delete an attached data object list if present (objects that were
87 * attached via acpi_attach_data). Note: After any normal object is
88 * detached above, the only possible remaining object(s) are data
89 * objects, in a linked list.
90 */
91 obj_desc = node->object;
92 while (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {
93
94 /* Invoke the attached data deletion handler if present */
95
96 if (obj_desc->data.handler) {
97 obj_desc->data.handler(node, obj_desc->data.pointer);
98 }
99
100 next_desc = obj_desc->common.next_object;
101 acpi_ut_remove_reference(obj_desc);
102 obj_desc = next_desc;
103 }
104
105 /* Special case for the statically allocated root node */
106
107 if (node == acpi_gbl_root_node) {
108 return;
109 }
110
111 /* Now we can delete the node */
112
113 (void)acpi_os_release_object(acpi_gbl_namespace_cache, node);
114
115 ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
116 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Node %p, Remaining %X\n",
117 node, acpi_gbl_current_node_count));
118 }
119
120 /*******************************************************************************
121 *
122 * FUNCTION: acpi_ns_remove_node
123 *
124 * PARAMETERS: node - Node to be removed/deleted
125 *
126 * RETURN: None
127 *
128 * DESCRIPTION: Remove (unlink) and delete a namespace node
129 *
130 ******************************************************************************/
131
132 void acpi_ns_remove_node(struct acpi_namespace_node *node)
133 {
134 struct acpi_namespace_node *parent_node;
135 struct acpi_namespace_node *prev_node;
136 struct acpi_namespace_node *next_node;
137
138 ACPI_FUNCTION_TRACE_PTR(ns_remove_node, node);
139
140 parent_node = node->parent;
141
142 prev_node = NULL;
143 next_node = parent_node->child;
144
145 /* Find the node that is the previous peer in the parent's child list */
146
147 while (next_node != node) {
148 prev_node = next_node;
149 next_node = next_node->peer;
150 }
151
152 if (prev_node) {
153
154 /* Node is not first child, unlink it */
155
156 prev_node->peer = node->peer;
157 } else {
158 /*
159 * Node is first child (has no previous peer).
160 * Link peer list to parent
161 */
162 parent_node->child = node->peer;
163 }
164
165 /* Delete the node and any attached objects */
166
167 acpi_ns_delete_node(node);
168 return_VOID;
169 }
170
171 /*******************************************************************************
172 *
173 * FUNCTION: acpi_ns_install_node
174 *
175 * PARAMETERS: walk_state - Current state of the walk
176 * parent_node - The parent of the new Node
177 * node - The new Node to install
178 * type - ACPI object type of the new Node
179 *
180 * RETURN: None
181 *
182 * DESCRIPTION: Initialize a new namespace node and install it amongst
183 * its peers.
184 *
185 * Note: Current namespace lookup is linear search. This appears
186 * to be sufficient as namespace searches consume only a small
187 * fraction of the execution time of the ACPI subsystem.
188 *
189 ******************************************************************************/
190
191 void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namespace_node *parent_node, /* Parent */
192 struct acpi_namespace_node *node, /* New Child */
193 acpi_object_type type)
194 {
195 acpi_owner_id owner_id = 0;
196 struct acpi_namespace_node *child_node;
197
198 ACPI_FUNCTION_TRACE(ns_install_node);
199
200 if (walk_state) {
201 /*
202 * Get the owner ID from the Walk state. The owner ID is used to
203 * track table deletion and deletion of objects created by methods.
204 */
205 owner_id = walk_state->owner_id;
206
207 if ((walk_state->method_desc) &&
208 (parent_node != walk_state->method_node)) {
209 /*
210 * A method is creating a new node that is not a child of the
211 * method (it is non-local). Mark the executing method as having
212 * modified the namespace. This is used for cleanup when the
213 * method exits.
214 */
215 walk_state->method_desc->method.info_flags |=
216 ACPI_METHOD_MODIFIED_NAMESPACE;
217 }
218 }
219
220 /* Link the new entry into the parent and existing children */
221
222 node->peer = NULL;
223 node->parent = parent_node;
224 child_node = parent_node->child;
225
226 if (!child_node) {
227 parent_node->child = node;
228 } else {
229 /* Add node to the end of the peer list */
230
231 while (child_node->peer) {
232 child_node = child_node->peer;
233 }
234
235 child_node->peer = node;
236 }
237
238 /* Init the new entry */
239
240 node->owner_id = owner_id;
241 node->type = (u8) type;
242
243 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
244 "%4.4s (%s) [Node %p Owner %3.3X] added to %4.4s (%s) [Node %p]\n",
245 acpi_ut_get_node_name(node),
246 acpi_ut_get_type_name(node->type), node, owner_id,
247 acpi_ut_get_node_name(parent_node),
248 acpi_ut_get_type_name(parent_node->type),
249 parent_node));
250
251 return_VOID;
252 }
253
254 /*******************************************************************************
255 *
256 * FUNCTION: acpi_ns_delete_children
257 *
258 * PARAMETERS: parent_node - Delete this objects children
259 *
260 * RETURN: None.
261 *
262 * DESCRIPTION: Delete all children of the parent object. In other words,
263 * deletes a "scope".
264 *
265 ******************************************************************************/
266
267 void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
268 {
269 struct acpi_namespace_node *next_node;
270 struct acpi_namespace_node *node_to_delete;
271
272 ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node);
273
274 if (!parent_node) {
275 return_VOID;
276 }
277
278 /* Deallocate all children at this level */
279
280 next_node = parent_node->child;
281 while (next_node) {
282
283 /* Grandchildren should have all been deleted already */
284
285 if (next_node->child) {
286 ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p",
287 parent_node, next_node));
288 }
289
290 /*
291 * Delete this child node and move on to the next child in the list.
292 * No need to unlink the node since we are deleting the entire branch.
293 */
294 node_to_delete = next_node;
295 next_node = next_node->peer;
296 acpi_ns_delete_node(node_to_delete);
297 };
298
299 /* Clear the parent's child pointer */
300
301 parent_node->child = NULL;
302 return_VOID;
303 }
304
305 /*******************************************************************************
306 *
307 * FUNCTION: acpi_ns_delete_namespace_subtree
308 *
309 * PARAMETERS: parent_node - Root of the subtree to be deleted
310 *
311 * RETURN: None.
312 *
313 * DESCRIPTION: Delete a subtree of the namespace. This includes all objects
314 * stored within the subtree.
315 *
316 ******************************************************************************/
317
318 void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
319 {
320 struct acpi_namespace_node *child_node = NULL;
321 u32 level = 1;
322 acpi_status status;
323
324 ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree);
325
326 if (!parent_node) {
327 return_VOID;
328 }
329
330 /* Lock namespace for possible update */
331
332 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
333 if (ACPI_FAILURE(status)) {
334 return_VOID;
335 }
336
337 /*
338 * Traverse the tree of objects until we bubble back up
339 * to where we started.
340 */
341 while (level > 0) {
342
343 /* Get the next node in this scope (NULL if none) */
344
345 child_node = acpi_ns_get_next_node(parent_node, child_node);
346 if (child_node) {
347
348 /* Found a child node - detach any attached object */
349
350 acpi_ns_detach_object(child_node);
351
352 /* Check if this node has any children */
353
354 if (child_node->child) {
355 /*
356 * There is at least one child of this node,
357 * visit the node
358 */
359 level++;
360 parent_node = child_node;
361 child_node = NULL;
362 }
363 } else {
364 /*
365 * No more children of this parent node.
366 * Move up to the grandparent.
367 */
368 level--;
369
370 /*
371 * Now delete all of the children of this parent
372 * all at the same time.
373 */
374 acpi_ns_delete_children(parent_node);
375
376 /* New "last child" is this parent node */
377
378 child_node = parent_node;
379
380 /* Move up the tree to the grandparent */
381
382 parent_node = parent_node->parent;
383 }
384 }
385
386 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
387 return_VOID;
388 }
389
390 /*******************************************************************************
391 *
392 * FUNCTION: acpi_ns_delete_namespace_by_owner
393 *
394 * PARAMETERS: owner_id - All nodes with this owner will be deleted
395 *
396 * RETURN: Status
397 *
398 * DESCRIPTION: Delete entries within the namespace that are owned by a
399 * specific ID. Used to delete entire ACPI tables. All
400 * reference counts are updated.
401 *
402 * MUTEX: Locks namespace during deletion walk.
403 *
404 ******************************************************************************/
405
406 void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
407 {
408 struct acpi_namespace_node *child_node;
409 struct acpi_namespace_node *deletion_node;
410 struct acpi_namespace_node *parent_node;
411 u32 level;
412 acpi_status status;
413
414 ACPI_FUNCTION_TRACE_U32(ns_delete_namespace_by_owner, owner_id);
415
416 if (owner_id == 0) {
417 return_VOID;
418 }
419
420 /* Lock namespace for possible update */
421
422 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
423 if (ACPI_FAILURE(status)) {
424 return_VOID;
425 }
426
427 deletion_node = NULL;
428 parent_node = acpi_gbl_root_node;
429 child_node = NULL;
430 level = 1;
431
432 /*
433 * Traverse the tree of nodes until we bubble back up
434 * to where we started.
435 */
436 while (level > 0) {
437 /*
438 * Get the next child of this parent node. When child_node is NULL,
439 * the first child of the parent is returned
440 */
441 child_node = acpi_ns_get_next_node(parent_node, child_node);
442
443 if (deletion_node) {
444 acpi_ns_delete_children(deletion_node);
445 acpi_ns_remove_node(deletion_node);
446 deletion_node = NULL;
447 }
448
449 if (child_node) {
450 if (child_node->owner_id == owner_id) {
451
452 /* Found a matching child node - detach any attached object */
453
454 acpi_ns_detach_object(child_node);
455 }
456
457 /* Check if this node has any children */
458
459 if (child_node->child) {
460 /*
461 * There is at least one child of this node,
462 * visit the node
463 */
464 level++;
465 parent_node = child_node;
466 child_node = NULL;
467 } else if (child_node->owner_id == owner_id) {
468 deletion_node = child_node;
469 }
470 } else {
471 /*
472 * No more children of this parent node.
473 * Move up to the grandparent.
474 */
475 level--;
476 if (level != 0) {
477 if (parent_node->owner_id == owner_id) {
478 deletion_node = parent_node;
479 }
480 }
481
482 /* New "last child" is this parent node */
483
484 child_node = parent_node;
485
486 /* Move up the tree to the grandparent */
487
488 parent_node = parent_node->parent;
489 }
490 }
491
492 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
493 return_VOID;
494 }