summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/nsalloc.c
blob: fe9b3639a87dcbf10bc7b622417ff464d64108e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: nsalloc - Namespace allocation and deletion utilities
 *
 ******************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsalloc")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_create_node
 *
 * PARAMETERS:  name            - Name of the new node (4 char ACPI name)
 *
 * RETURN:      New namespace node (Null on failure)
 *
 * DESCRIPTION: Create a namespace node
 *
 ******************************************************************************/
struct acpi_namespace_node *acpi_ns_create_node(u32 name)
{
	struct acpi_namespace_node *node;
#ifdef ACPI_DBG_TRACK_ALLOCATIONS
	u32 temp;
#endif

	ACPI_FUNCTION_TRACE(ns_create_node);

	node = acpi_os_acquire_object(acpi_gbl_namespace_cache);
	if (!node) {
		return_PTR(NULL);
	}

	ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_allocated++);

#ifdef ACPI_DBG_TRACK_ALLOCATIONS
	temp = acpi_gbl_ns_node_list->total_allocated -
	    acpi_gbl_ns_node_list->total_freed;
	if (temp > acpi_gbl_ns_node_list->max_occupied) {
		acpi_gbl_ns_node_list->max_occupied = temp;
	}
#endif

	node->name.integer = name;
	ACPI_SET_DESCRIPTOR_TYPE(node, ACPI_DESC_TYPE_NAMED);
	return_PTR(node);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_delete_node
 *
 * PARAMETERS:  node            - Node to be deleted
 *
 * RETURN:      None
 *
 * DESCRIPTION: Delete a namespace node. All node deletions must come through
 *              here. Detaches any attached objects, including any attached
 *              data. If a handler is associated with attached data, it is
 *              invoked before the node is deleted.
 *
 ******************************************************************************/

void acpi_ns_delete_node(struct acpi_namespace_node *node)
{
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *next_desc;

	ACPI_FUNCTION_NAME(ns_delete_node);

	if (!node) {
		return_VOID;
	}

	/* Detach an object if there is one */

	acpi_ns_detach_object(node);

	/*
	 * Delete an attached data object list if present (objects that were
	 * attached via acpi_attach_data). Note: After any normal object is
	 * detached above, the only possible remaining object(s) are data
	 * objects, in a linked list.
	 */
	obj_desc = node->object;
	while (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {

		/* Invoke the attached data deletion handler if present */

		if (obj_desc->data.handler) {
			obj_desc->data.handler(node, obj_desc->data.pointer);
		}

		next_desc = obj_desc->common.next_object;
		acpi_ut_remove_reference(obj_desc);
		obj_desc = next_desc;
	}

	/* Special case for the statically allocated root node */

	if (node == acpi_gbl_root_node) {
		return;
	}

	/* Now we can delete the node */

	(void)acpi_os_release_object(acpi_gbl_namespace_cache, node);

	ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Node %p, Remaining %X\n",
			  node, acpi_gbl_current_node_count));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_remove_node
 *
 * PARAMETERS:  node            - Node to be removed/deleted
 *
 * RETURN:      None
 *
 * DESCRIPTION: Remove (unlink) and delete a namespace node
 *
 ******************************************************************************/

void acpi_ns_remove_node(struct acpi_namespace_node *node)
{
	struct acpi_namespace_node *parent_node;
	struct acpi_namespace_node *prev_node;
	struct acpi_namespace_node *next_node;

	ACPI_FUNCTION_TRACE_PTR(ns_remove_node, node);

	parent_node = node->parent;

	prev_node = NULL;
	next_node = parent_node->child;

	/* Find the node that is the previous peer in the parent's child list */

	while (next_node != node) {
		prev_node = next_node;
		next_node = next_node->peer;
	}

	if (prev_node) {

		/* Node is not first child, unlink it */

		prev_node->peer = node->peer;
	} else {
		/*
		 * Node is first child (has no previous peer).
		 * Link peer list to parent
		 */
		parent_node->child = node->peer;
	}

	/* Delete the node and any attached objects */

	acpi_ns_delete_node(node);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_install_node
 *
 * PARAMETERS:  walk_state      - Current state of the walk
 *              parent_node     - The parent of the new Node
 *              node            - The new Node to install
 *              type            - ACPI object type of the new Node
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a new namespace node and install it amongst
 *              its peers.
 *
 *              Note: Current namespace lookup is linear search. This appears
 *              to be sufficient as namespace searches consume only a small
 *              fraction of the execution time of the ACPI subsystem.
 *
 ******************************************************************************/

void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namespace_node *parent_node,	/* Parent */
			  struct acpi_namespace_node *node,	/* New Child */
			  acpi_object_type type)
{
	acpi_owner_id owner_id = 0;
	struct acpi_namespace_node *child_node;

	ACPI_FUNCTION_TRACE(ns_install_node);

	if (walk_state) {
		/*
		 * Get the owner ID from the Walk state. The owner ID is used to
		 * track table deletion and deletion of objects created by methods.
		 */
		owner_id = walk_state->owner_id;

		if ((walk_state->method_desc) &&
		    (parent_node != walk_state->method_node)) {
			/*
			 * A method is creating a new node that is not a child of the
			 * method (it is non-local). Mark the executing method as having
			 * modified the namespace. This is used for cleanup when the
			 * method exits.
			 */
			walk_state->method_desc->method.info_flags |=
			    ACPI_METHOD_MODIFIED_NAMESPACE;
		}
	}

	/* Link the new entry into the parent and existing children */

	node->peer = NULL;
	node->parent = parent_node;
	child_node = parent_node->child;

	if (!child_node) {
		parent_node->child = node;
	} else {
		/* Add node to the end of the peer list */

		while (child_node->peer) {
			child_node = child_node->peer;
		}

		child_node->peer = node;
	}

	/* Init the new entry */

	node->owner_id = owner_id;
	node->type = (u8) type;

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
			  "%4.4s (%s) [Node %p Owner %3.3X] added to %4.4s (%s) [Node %p]\n",
			  acpi_ut_get_node_name(node),
			  acpi_ut_get_type_name(node->type), node, owner_id,
			  acpi_ut_get_node_name(parent_node),
			  acpi_ut_get_type_name(parent_node->type),
			  parent_node));

	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_delete_children
 *
 * PARAMETERS:  parent_node     - Delete this objects children
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Delete all children of the parent object. In other words,
 *              deletes a "scope".
 *
 ******************************************************************************/

void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
{
	struct acpi_namespace_node *next_node;
	struct acpi_namespace_node *node_to_delete;

	ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node);

	if (!parent_node) {
		return_VOID;
	}

	/* Deallocate all children at this level */

	next_node = parent_node->child;
	while (next_node) {

		/* Grandchildren should have all been deleted already */

		if (next_node->child) {
			ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p",
				    parent_node, next_node));
		}

		/*
		 * Delete this child node and move on to the next child in the list.
		 * No need to unlink the node since we are deleting the entire branch.
		 */
		node_to_delete = next_node;
		next_node = next_node->peer;
		acpi_ns_delete_node(node_to_delete);
	};

	/* Clear the parent's child pointer */

	parent_node->child = NULL;
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_delete_namespace_subtree
 *
 * PARAMETERS:  parent_node     - Root of the subtree to be deleted
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Delete a subtree of the namespace. This includes all objects
 *              stored within the subtree.
 *
 ******************************************************************************/

void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
{
	struct acpi_namespace_node *child_node = NULL;
	u32 level = 1;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree);

	if (!parent_node) {
		return_VOID;
	}

	/* Lock namespace for possible update */

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_VOID;
	}

	/*
	 * Traverse the tree of objects until we bubble back up
	 * to where we started.
	 */
	while (level > 0) {

		/* Get the next node in this scope (NULL if none) */

		child_node = acpi_ns_get_next_node(parent_node, child_node);
		if (child_node) {

			/* Found a child node - detach any attached object */

			acpi_ns_detach_object(child_node);

			/* Check if this node has any children */

			if (child_node->child) {
				/*
				 * There is at least one child of this node,
				 * visit the node
				 */
				level++;
				parent_node = child_node;
				child_node = NULL;
			}
		} else {
			/*
			 * No more children of this parent node.
			 * Move up to the grandparent.
			 */
			level--;

			/*
			 * Now delete all of the children of this parent
			 * all at the same time.
			 */
			acpi_ns_delete_children(parent_node);

			/* New "last child" is this parent node */

			child_node = parent_node;

			/* Move up the tree to the grandparent */

			parent_node = parent_node->parent;
		}
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_delete_namespace_by_owner
 *
 * PARAMETERS:  owner_id    - All nodes with this owner will be deleted
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete entries within the namespace that are owned by a
 *              specific ID. Used to delete entire ACPI tables. All
 *              reference counts are updated.
 *
 * MUTEX:       Locks namespace during deletion walk.
 *
 ******************************************************************************/

void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
{
	struct acpi_namespace_node *child_node;
	struct acpi_namespace_node *deletion_node;
	struct acpi_namespace_node *parent_node;
	u32 level;
	acpi_status status;

	ACPI_FUNCTION_TRACE_U32(ns_delete_namespace_by_owner, owner_id);

	if (owner_id == 0) {
		return_VOID;
	}

	/* Lock namespace for possible update */

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_VOID;
	}

	deletion_node = NULL;
	parent_node = acpi_gbl_root_node;
	child_node = NULL;
	level = 1;

	/*
	 * Traverse the tree of nodes until we bubble back up
	 * to where we started.
	 */
	while (level > 0) {
		/*
		 * Get the next child of this parent node. When child_node is NULL,
		 * the first child of the parent is returned
		 */
		child_node = acpi_ns_get_next_node(parent_node, child_node);

		if (deletion_node) {
			acpi_ns_delete_children(deletion_node);
			acpi_ns_remove_node(deletion_node);
			deletion_node = NULL;
		}

		if (child_node) {
			if (child_node->owner_id == owner_id) {

				/* Found a matching child node - detach any attached object */

				acpi_ns_detach_object(child_node);
			}

			/* Check if this node has any children */

			if (child_node->child) {
				/*
				 * There is at least one child of this node,
				 * visit the node
				 */
				level++;
				parent_node = child_node;
				child_node = NULL;
			} else if (child_node->owner_id == owner_id) {
				deletion_node = child_node;
			}
		} else {
			/*
			 * No more children of this parent node.
			 * Move up to the grandparent.
			 */
			level--;
			if (level != 0) {
				if (parent_node->owner_id == owner_id) {
					deletion_node = parent_node;
				}
			}

			/* New "last child" is this parent node */

			child_node = parent_node;

			/* Move up the tree to the grandparent */

			parent_node = parent_node->parent;
		}
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return_VOID;
}