1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: utobject - ACPI object create/delete/size/cache routines
5 *
6 * Copyright (C) 2000 - 2025, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include <linux/kmemleak.h>
12#include "accommon.h"
13#include "acnamesp.h"
14
15#define _COMPONENT ACPI_UTILITIES
16ACPI_MODULE_NAME("utobject")
17
18/* Local prototypes */
19static acpi_status
20acpi_ut_get_simple_object_size(union acpi_operand_object *obj,
21 acpi_size *obj_length);
22
23static acpi_status
24acpi_ut_get_package_object_size(union acpi_operand_object *obj,
25 acpi_size *obj_length);
26
27static acpi_status
28acpi_ut_get_element_length(u8 object_type,
29 union acpi_operand_object *source_object,
30 union acpi_generic_state *state, void *context);
31
32/*******************************************************************************
33 *
34 * FUNCTION: acpi_ut_create_internal_object_dbg
35 *
36 * PARAMETERS: module_name - Source file name of caller
37 * line_number - Line number of caller
38 * component_id - Component type of caller
39 * type - ACPI Type of the new object
40 *
41 * RETURN: A new internal object, null on failure
42 *
43 * DESCRIPTION: Create and initialize a new internal object.
44 *
45 * NOTE: We always allocate the worst-case object descriptor because
46 * these objects are cached, and we want them to be
47 * one-size-satisfies-any-request. This in itself may not be
48 * the most memory efficient, but the efficiency of the object
49 * cache should more than make up for this!
50 *
51 ******************************************************************************/
52
53union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char
54 *module_name,
55 u32 line_number,
56 u32 component_id,
57 acpi_object_type
58 type)
59{
60 union acpi_operand_object *object;
61 union acpi_operand_object *second_object;
62
63 ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg,
64 acpi_ut_get_type_name(type));
65
66 /* Allocate the raw object descriptor */
67
68 object =
69 acpi_ut_allocate_object_desc_dbg(module_name, line_number,
70 component_id);
71 if (!object) {
72 return_PTR(NULL);
73 }
74 kmemleak_not_leak(ptr: object);
75
76 switch (type) {
77 case ACPI_TYPE_REGION:
78 case ACPI_TYPE_BUFFER_FIELD:
79 case ACPI_TYPE_LOCAL_BANK_FIELD:
80
81 /* These types require a secondary object */
82
83 second_object =
84 acpi_ut_allocate_object_desc_dbg(module_name, line_number,
85 component_id);
86 if (!second_object) {
87 acpi_ut_delete_object_desc(object);
88 return_PTR(NULL);
89 }
90
91 second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
92 second_object->common.reference_count = 1;
93
94 /* Link the second object to the first */
95
96 object->common.next_object = second_object;
97 break;
98
99 default:
100
101 /* All others have no secondary object */
102 break;
103 }
104
105 /* Save the object type in the object descriptor */
106
107 object->common.type = (u8) type;
108
109 /* Init the reference count */
110
111 object->common.reference_count = 1;
112
113 /* Any per-type initialization should go here */
114
115 return_PTR(object);
116}
117
118/*******************************************************************************
119 *
120 * FUNCTION: acpi_ut_create_package_object
121 *
122 * PARAMETERS: count - Number of package elements
123 *
124 * RETURN: Pointer to a new Package object, null on failure
125 *
126 * DESCRIPTION: Create a fully initialized package object
127 *
128 ******************************************************************************/
129
130union acpi_operand_object *acpi_ut_create_package_object(u32 count)
131{
132 union acpi_operand_object *package_desc;
133 union acpi_operand_object **package_elements;
134
135 ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count);
136
137 /* Create a new Package object */
138
139 package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
140 if (!package_desc) {
141 return_PTR(NULL);
142 }
143
144 /*
145 * Create the element array. Count+1 allows the array to be null
146 * terminated.
147 */
148 package_elements = ACPI_ALLOCATE_ZEROED(((acpi_size)count +
149 1) * sizeof(void *));
150 if (!package_elements) {
151 ACPI_FREE(package_desc);
152 return_PTR(NULL);
153 }
154
155 package_desc->package.count = count;
156 package_desc->package.elements = package_elements;
157 return_PTR(package_desc);
158}
159
160/*******************************************************************************
161 *
162 * FUNCTION: acpi_ut_create_integer_object
163 *
164 * PARAMETERS: initial_value - Initial value for the integer
165 *
166 * RETURN: Pointer to a new Integer object, null on failure
167 *
168 * DESCRIPTION: Create an initialized integer object
169 *
170 ******************************************************************************/
171
172union acpi_operand_object *acpi_ut_create_integer_object(u64 initial_value)
173{
174 union acpi_operand_object *integer_desc;
175
176 ACPI_FUNCTION_TRACE(ut_create_integer_object);
177
178 /* Create and initialize a new integer object */
179
180 integer_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
181 if (!integer_desc) {
182 return_PTR(NULL);
183 }
184
185 integer_desc->integer.value = initial_value;
186 return_PTR(integer_desc);
187}
188
189/*******************************************************************************
190 *
191 * FUNCTION: acpi_ut_create_buffer_object
192 *
193 * PARAMETERS: buffer_size - Size of buffer to be created
194 *
195 * RETURN: Pointer to a new Buffer object, null on failure
196 *
197 * DESCRIPTION: Create a fully initialized buffer object
198 *
199 ******************************************************************************/
200
201union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)
202{
203 union acpi_operand_object *buffer_desc;
204 u8 *buffer = NULL;
205
206 ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size);
207
208 /* Create a new Buffer object */
209
210 buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
211 if (!buffer_desc) {
212 return_PTR(NULL);
213 }
214
215 /* Create an actual buffer only if size > 0 */
216
217 if (buffer_size > 0) {
218
219 /* Allocate the actual buffer */
220
221 buffer = ACPI_ALLOCATE_ZEROED(buffer_size);
222 if (!buffer) {
223 ACPI_ERROR((AE_INFO, "Could not allocate size %u",
224 (u32)buffer_size));
225
226 acpi_ut_remove_reference(object: buffer_desc);
227 return_PTR(NULL);
228 }
229 }
230
231 /* Complete buffer object initialization */
232
233 buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
234 buffer_desc->buffer.pointer = buffer;
235 buffer_desc->buffer.length = (u32) buffer_size;
236
237 /* Return the new buffer descriptor */
238
239 return_PTR(buffer_desc);
240}
241
242/*******************************************************************************
243 *
244 * FUNCTION: acpi_ut_create_string_object
245 *
246 * PARAMETERS: string_size - Size of string to be created. Does not
247 * include NULL terminator, this is added
248 * automatically.
249 *
250 * RETURN: Pointer to a new String object
251 *
252 * DESCRIPTION: Create a fully initialized string object
253 *
254 ******************************************************************************/
255
256union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)
257{
258 union acpi_operand_object *string_desc;
259 char *string;
260
261 ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size);
262
263 /* Create a new String object */
264
265 string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);
266 if (!string_desc) {
267 return_PTR(NULL);
268 }
269
270 /*
271 * Allocate the actual string buffer -- (Size + 1) for NULL terminator.
272 * NOTE: Zero-length strings are NULL terminated
273 */
274 string = ACPI_ALLOCATE_ZEROED(string_size + 1);
275 if (!string) {
276 ACPI_ERROR((AE_INFO, "Could not allocate size %u",
277 (u32)string_size));
278
279 acpi_ut_remove_reference(object: string_desc);
280 return_PTR(NULL);
281 }
282
283 /* Complete string object initialization */
284
285 string_desc->string.pointer = string;
286 string_desc->string.length = (u32) string_size;
287
288 /* Return the new string descriptor */
289
290 return_PTR(string_desc);
291}
292
293/*******************************************************************************
294 *
295 * FUNCTION: acpi_ut_valid_internal_object
296 *
297 * PARAMETERS: object - Object to be validated
298 *
299 * RETURN: TRUE if object is valid, FALSE otherwise
300 *
301 * DESCRIPTION: Validate a pointer to be of type union acpi_operand_object
302 *
303 ******************************************************************************/
304
305u8 acpi_ut_valid_internal_object(void *object)
306{
307
308 ACPI_FUNCTION_NAME(ut_valid_internal_object);
309
310 /* Check for a null pointer */
311
312 if (!object) {
313 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "**** Null Object Ptr\n"));
314 return (FALSE);
315 }
316
317 /* Check the descriptor type field */
318
319 switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {
320 case ACPI_DESC_TYPE_OPERAND:
321
322 /* The object appears to be a valid union acpi_operand_object */
323
324 return (TRUE);
325
326 default:
327
328 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
329 "%p is not an ACPI operand obj [%s]\n",
330 object, acpi_ut_get_descriptor_name(object)));
331 break;
332 }
333
334 return (FALSE);
335}
336
337/*******************************************************************************
338 *
339 * FUNCTION: acpi_ut_allocate_object_desc_dbg
340 *
341 * PARAMETERS: module_name - Caller's module name (for error output)
342 * line_number - Caller's line number (for error output)
343 * component_id - Caller's component ID (for error output)
344 *
345 * RETURN: Pointer to newly allocated object descriptor. Null on error
346 *
347 * DESCRIPTION: Allocate a new object descriptor. Gracefully handle
348 * error conditions.
349 *
350 ******************************************************************************/
351
352void *acpi_ut_allocate_object_desc_dbg(const char *module_name,
353 u32 line_number, u32 component_id)
354{
355 union acpi_operand_object *object;
356
357 ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg);
358
359 object = acpi_os_acquire_object(acpi_gbl_operand_cache);
360 if (!object) {
361 ACPI_ERROR((module_name, line_number,
362 "Could not allocate an object descriptor"));
363
364 return_PTR(NULL);
365 }
366
367 /* Mark the descriptor type */
368
369 ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);
370
371 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
372 object, (u32) sizeof(union acpi_operand_object)));
373
374 return_PTR(object);
375}
376
377/*******************************************************************************
378 *
379 * FUNCTION: acpi_ut_delete_object_desc
380 *
381 * PARAMETERS: object - An Acpi internal object to be deleted
382 *
383 * RETURN: None.
384 *
385 * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
386 *
387 ******************************************************************************/
388
389void acpi_ut_delete_object_desc(union acpi_operand_object *object)
390{
391 ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object);
392
393 /* Object must be of type union acpi_operand_object */
394
395 if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) {
396 ACPI_ERROR((AE_INFO,
397 "%p is not an ACPI Operand object [%s]", object,
398 acpi_ut_get_descriptor_name(object)));
399 return_VOID;
400 }
401
402 (void)acpi_os_release_object(cache: acpi_gbl_operand_cache, object);
403 return_VOID;
404}
405
406/*******************************************************************************
407 *
408 * FUNCTION: acpi_ut_get_simple_object_size
409 *
410 * PARAMETERS: internal_object - An ACPI operand object
411 * obj_length - Where the length is returned
412 *
413 * RETURN: Status
414 *
415 * DESCRIPTION: This function is called to determine the space required to
416 * contain a simple object for return to an external user.
417 *
418 * The length includes the object structure plus any additional
419 * needed space.
420 *
421 ******************************************************************************/
422
423static acpi_status
424acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object,
425 acpi_size *obj_length)
426{
427 acpi_size length;
428 acpi_size size;
429 acpi_status status = AE_OK;
430
431 ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object);
432
433 /* Start with the length of the (external) Acpi object */
434
435 length = sizeof(union acpi_object);
436
437 /* A NULL object is allowed, can be a legal uninitialized package element */
438
439 if (!internal_object) {
440 /*
441 * Object is NULL, just return the length of union acpi_object
442 * (A NULL union acpi_object is an object of all zeroes.)
443 */
444 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
445 return_ACPI_STATUS(AE_OK);
446 }
447
448 /* A Namespace Node should never appear here */
449
450 if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) {
451
452 /* A namespace node should never get here */
453
454 ACPI_ERROR((AE_INFO,
455 "Received a namespace node [%4.4s] "
456 "where an operand object is required",
457 ACPI_CAST_PTR(struct acpi_namespace_node,
458 internal_object)->name.ascii));
459 return_ACPI_STATUS(AE_AML_INTERNAL);
460 }
461
462 /*
463 * The final length depends on the object type
464 * Strings and Buffers are packed right up against the parent object and
465 * must be accessed bytewise or there may be alignment problems on
466 * certain processors
467 */
468 switch (internal_object->common.type) {
469 case ACPI_TYPE_STRING:
470
471 length += (acpi_size)internal_object->string.length + 1;
472 break;
473
474 case ACPI_TYPE_BUFFER:
475
476 length += (acpi_size)internal_object->buffer.length;
477 break;
478
479 case ACPI_TYPE_INTEGER:
480 case ACPI_TYPE_PROCESSOR:
481 case ACPI_TYPE_POWER:
482
483 /* No extra data for these types */
484
485 break;
486
487 case ACPI_TYPE_LOCAL_REFERENCE:
488
489 switch (internal_object->reference.class) {
490 case ACPI_REFCLASS_NAME:
491 /*
492 * Get the actual length of the full pathname to this object.
493 * The reference will be converted to the pathname to the object
494 */
495 size =
496 acpi_ns_get_pathname_length(node: internal_object->
497 reference.node);
498 if (!size) {
499 return_ACPI_STATUS(AE_BAD_PARAMETER);
500 }
501
502 length += ACPI_ROUND_UP_TO_NATIVE_WORD(size);
503 break;
504
505 default:
506 /*
507 * No other reference opcodes are supported.
508 * Notably, Locals and Args are not supported, but this may be
509 * required eventually.
510 */
511 ACPI_ERROR((AE_INFO,
512 "Cannot convert to external object - "
513 "unsupported Reference Class [%s] 0x%X in object %p",
514 acpi_ut_get_reference_name(internal_object),
515 internal_object->reference.class,
516 internal_object));
517 status = AE_TYPE;
518 break;
519 }
520 break;
521
522 default:
523
524 ACPI_ERROR((AE_INFO, "Cannot convert to external object - "
525 "unsupported type [%s] 0x%X in object %p",
526 acpi_ut_get_object_type_name(internal_object),
527 internal_object->common.type, internal_object));
528 status = AE_TYPE;
529 break;
530 }
531
532 /*
533 * Account for the space required by the object rounded up to the next
534 * multiple of the machine word size. This keeps each object aligned
535 * on a machine word boundary. (preventing alignment faults on some
536 * machines.)
537 */
538 *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
539 return_ACPI_STATUS(status);
540}
541
542/*******************************************************************************
543 *
544 * FUNCTION: acpi_ut_get_element_length
545 *
546 * PARAMETERS: acpi_pkg_callback
547 *
548 * RETURN: Status
549 *
550 * DESCRIPTION: Get the length of one package element.
551 *
552 ******************************************************************************/
553
554static acpi_status
555acpi_ut_get_element_length(u8 object_type,
556 union acpi_operand_object *source_object,
557 union acpi_generic_state *state, void *context)
558{
559 acpi_status status = AE_OK;
560 struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
561 acpi_size object_space;
562
563 switch (object_type) {
564 case ACPI_COPY_TYPE_SIMPLE:
565 /*
566 * Simple object - just get the size (Null object/entry is handled
567 * here also) and sum it into the running package length
568 */
569 status =
570 acpi_ut_get_simple_object_size(internal_object: source_object,
571 obj_length: &object_space);
572 if (ACPI_FAILURE(status)) {
573 return (status);
574 }
575
576 info->length += object_space;
577 break;
578
579 case ACPI_COPY_TYPE_PACKAGE:
580
581 /* Package object - nothing much to do here, let the walk handle it */
582
583 info->num_packages++;
584 state->pkg.this_target_obj = NULL;
585 break;
586
587 default:
588
589 /* No other types allowed */
590
591 return (AE_BAD_PARAMETER);
592 }
593
594 return (status);
595}
596
597/*******************************************************************************
598 *
599 * FUNCTION: acpi_ut_get_package_object_size
600 *
601 * PARAMETERS: internal_object - An ACPI internal object
602 * obj_length - Where the length is returned
603 *
604 * RETURN: Status
605 *
606 * DESCRIPTION: This function is called to determine the space required to
607 * contain a package object for return to an external user.
608 *
609 * This is moderately complex since a package contains other
610 * objects including packages.
611 *
612 ******************************************************************************/
613
614static acpi_status
615acpi_ut_get_package_object_size(union acpi_operand_object *internal_object,
616 acpi_size *obj_length)
617{
618 acpi_status status;
619 struct acpi_pkg_info info;
620
621 ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object);
622
623 info.length = 0;
624 info.object_space = 0;
625 info.num_packages = 1;
626
627 status =
628 acpi_ut_walk_package_tree(source_object: internal_object, NULL,
629 walk_callback: acpi_ut_get_element_length, context: &info);
630 if (ACPI_FAILURE(status)) {
631 return_ACPI_STATUS(status);
632 }
633
634 /*
635 * We have handled all of the objects in all levels of the package.
636 * just add the length of the package objects themselves.
637 * Round up to the next machine word.
638 */
639 info.length +=
640 ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) *
641 (acpi_size)info.num_packages;
642
643 /* Return the total package length */
644
645 *obj_length = info.length;
646 return_ACPI_STATUS(status);
647}
648
649/*******************************************************************************
650 *
651 * FUNCTION: acpi_ut_get_object_size
652 *
653 * PARAMETERS: internal_object - An ACPI internal object
654 * obj_length - Where the length will be returned
655 *
656 * RETURN: Status
657 *
658 * DESCRIPTION: This function is called to determine the space required to
659 * contain an object for return to an API user.
660 *
661 ******************************************************************************/
662
663acpi_status
664acpi_ut_get_object_size(union acpi_operand_object *internal_object,
665 acpi_size *obj_length)
666{
667 acpi_status status;
668
669 ACPI_FUNCTION_ENTRY();
670
671 if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) ==
672 ACPI_DESC_TYPE_OPERAND) &&
673 (internal_object->common.type == ACPI_TYPE_PACKAGE)) {
674 status =
675 acpi_ut_get_package_object_size(internal_object,
676 obj_length);
677 } else {
678 status =
679 acpi_ut_get_simple_object_size(internal_object, obj_length);
680 }
681
682 return (status);
683}
684