summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/dspkginit.c
blob: 997faa10f615188a66c7df805d4d90f39281830d (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
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: dspkginit - Completion of deferred package initialization
 *
 * Copyright (C) 2000 - 2019, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acparser.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("dspkginit")

/* Local prototypes */
static void
acpi_ds_resolve_package_element(union acpi_operand_object **element);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_build_internal_package_obj
 *
 * PARAMETERS:  walk_state      - Current walk state
 *              op              - Parser object to be translated
 *              element_count   - Number of elements in the package - this is
 *                                the num_elements argument to Package()
 *              obj_desc_ptr    - Where the ACPI internal object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Translate a parser Op package object to the equivalent
 *              namespace object
 *
 * NOTE: The number of elements in the package will be always be the num_elements
 * count, regardless of the number of elements in the package list. If
 * num_elements is smaller, only that many package list elements are used.
 * if num_elements is larger, the Package object is padded out with
 * objects of type Uninitialized (as per ACPI spec.)
 *
 * Even though the ASL compilers do not allow num_elements to be smaller
 * than the Package list length (for the fixed length package opcode), some
 * BIOS code modifies the AML on the fly to adjust the num_elements, and
 * this code compensates for that. This also provides compatibility with
 * other AML interpreters.
 *
 ******************************************************************************/

acpi_status
acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
				   union acpi_parse_object *op,
				   u32 element_count,
				   union acpi_operand_object **obj_desc_ptr)
{
	union acpi_parse_object *arg;
	union acpi_parse_object *parent;
	union acpi_operand_object *obj_desc = NULL;
	acpi_status status = AE_OK;
	u8 module_level_code = FALSE;
	u16 reference_count;
	u32 index;
	u32 i;

	ACPI_FUNCTION_TRACE(ds_build_internal_package_obj);

	/* Check if we are executing module level code */

	if (walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL) {
		module_level_code = TRUE;
	}

	/* Find the parent of a possibly nested package */

	parent = op->common.parent;
	while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
	       (parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP)) {
		parent = parent->common.parent;
	}

	/*
	 * If we are evaluating a Named package object of the form:
	 *      Name (xxxx, Package)
	 * the package object already exists, otherwise it must be created.
	 */
	obj_desc = *obj_desc_ptr;
	if (!obj_desc) {
		obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
		*obj_desc_ptr = obj_desc;
		if (!obj_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		obj_desc->package.node = parent->common.node;
	}

	if (obj_desc->package.flags & AOPOBJ_DATA_VALID) {	/* Just in case */
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * Allocate the element array (array of pointers to the individual
	 * objects) if necessary. the count is based on the num_elements
	 * parameter. Add an extra pointer slot so that the list is always
	 * null terminated.
	 */
	if (!obj_desc->package.elements) {
		obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
								   element_count
								   +
								   1) *
								  sizeof(void
									 *));

		if (!obj_desc->package.elements) {
			acpi_ut_delete_object_desc(obj_desc);
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		obj_desc->package.count = element_count;
	}

	/* First arg is element count. Second arg begins the initializer list */

	arg = op->common.value.arg;
	arg = arg->common.next;

	/*
	 * If we are executing module-level code, we will defer the
	 * full resolution of the package elements in order to support
	 * forward references from the elements. This provides
	 * compatibility with other ACPI implementations.
	 */
	if (module_level_code) {
		obj_desc->package.aml_start = walk_state->aml;
		obj_desc->package.aml_length = 0;

		ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
				      "%s: Deferring resolution of Package elements\n",
				      ACPI_GET_FUNCTION_NAME));
	}

	/*
	 * Initialize the elements of the package, up to the num_elements count.
	 * Package is automatically padded with uninitialized (NULL) elements
	 * if num_elements is greater than the package list length. Likewise,
	 * Package is truncated if num_elements is less than the list length.
	 */
	for (i = 0; arg && (i < element_count); i++) {
		if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
			if (!arg->common.node) {
				/*
				 * This is the case where an expression has returned a value.
				 * The use of expressions (term_args) within individual
				 * package elements is not supported by the AML interpreter,
				 * even though the ASL grammar supports it. Example:
				 *
				 *      Name (INT1, 0x1234)
				 *
				 *      Name (PKG3, Package () {
				 *          Add (INT1, 0xAAAA0000)
				 *      })
				 *
				 *  1) No known AML interpreter supports this type of construct
				 *  2) This fixes a fault if the construct is encountered
				 */
				ACPI_EXCEPTION((AE_INFO, AE_SUPPORT,
						"Expressions within package elements are not supported"));

				/* Cleanup the return object, it is not needed */

				acpi_ut_remove_reference(walk_state->results->
							 results.obj_desc[0]);
				return_ACPI_STATUS(AE_SUPPORT);
			}

			if (arg->common.node->type == ACPI_TYPE_METHOD) {
				/*
				 * A method reference "looks" to the parser to be a method
				 * invocation, so we special case it here
				 */
				arg->common.aml_opcode = AML_INT_NAMEPATH_OP;
				status =
				    acpi_ds_build_internal_object(walk_state,
								  arg,
								  &obj_desc->
								  package.
								  elements[i]);
			} else {
				/* This package element is already built, just get it */

				obj_desc->package.elements[i] =
				    ACPI_CAST_PTR(union acpi_operand_object,
						  arg->common.node);
			}
		} else {
			status =
			    acpi_ds_build_internal_object(walk_state, arg,
							  &obj_desc->package.
							  elements[i]);
			if (status == AE_NOT_FOUND) {
				ACPI_ERROR((AE_INFO, "%-48s",
					    "****DS namepath not found"));
			}

			if (!module_level_code) {
				/*
				 * Initialize this package element. This function handles the
				 * resolution of named references within the package.
				 * Forward references from module-level code are deferred
				 * until all ACPI tables are loaded.
				 */
				acpi_ds_init_package_element(0,
							     obj_desc->package.
							     elements[i], NULL,
							     &obj_desc->package.
							     elements[i]);
			}
		}

		if (*obj_desc_ptr) {

			/* Existing package, get existing reference count */

			reference_count =
			    (*obj_desc_ptr)->common.reference_count;
			if (reference_count > 1) {

				/* Make new element ref count match original ref count */
				/* TBD: Probably need an acpi_ut_add_references function */

				for (index = 0;
				     index < ((u32)reference_count - 1);
				     index++) {
					acpi_ut_add_reference((obj_desc->
							       package.
							       elements[i]));
				}
			}
		}

		arg = arg->common.next;
	}

	/* Check for match between num_elements and actual length of package_list */

	if (arg) {
		/*
		 * num_elements was exhausted, but there are remaining elements in
		 * the package_list. Truncate the package to num_elements.
		 *
		 * Note: technically, this is an error, from ACPI spec: "It is an
		 * error for NumElements to be less than the number of elements in
		 * the PackageList". However, we just print a message and no
		 * exception is returned. This provides compatibility with other
		 * ACPI implementations. Some firmware implementations will alter
		 * the num_elements on the fly, possibly creating this type of
		 * ill-formed package object.
		 */
		while (arg) {
			/*
			 * We must delete any package elements that were created earlier
			 * and are not going to be used because of the package truncation.
			 */
			if (arg->common.node) {
				acpi_ut_remove_reference(ACPI_CAST_PTR
							 (union
							  acpi_operand_object,
							  arg->common.node));
				arg->common.node = NULL;
			}

			/* Find out how many elements there really are */

			i++;
			arg = arg->common.next;
		}

		ACPI_INFO(("Actual Package length (%u) is larger than "
			   "NumElements field (%u), truncated",
			   i, element_count));
	} else if (i < element_count) {
		/*
		 * Arg list (elements) was exhausted, but we did not reach
		 * num_elements count.
		 *
		 * Note: this is not an error, the package is padded out
		 * with NULLs as per the ACPI specification.
		 */
		ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
				      "%s: Package List length (%u) smaller than NumElements "
				      "count (%u), padded with null elements\n",
				      ACPI_GET_FUNCTION_NAME, i,
				      element_count));
	}

	/* Module-level packages will be resolved later */

	if (!module_level_code) {
		obj_desc->package.flags |= AOPOBJ_DATA_VALID;
	}

	op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_init_package_element
 *
 * PARAMETERS:  acpi_pkg_callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Resolve a named reference element within a package object
 *
 ******************************************************************************/

acpi_status
acpi_ds_init_package_element(u8 object_type,
			     union acpi_operand_object *source_object,
			     union acpi_generic_state *state, void *context)
{
	union acpi_operand_object **element_ptr;

	ACPI_FUNCTION_TRACE(ds_init_package_element);

	if (!source_object) {
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * The following code is a bit of a hack to workaround a (current)
	 * limitation of the acpi_pkg_callback interface. We need a pointer
	 * to the location within the element array because a new object
	 * may be created and stored there.
	 */
	if (context) {

		/* A direct call was made to this function */

		element_ptr = (union acpi_operand_object **)context;
	} else {
		/* Call came from acpi_ut_walk_package_tree */

		element_ptr = state->pkg.this_target_obj;
	}

	/* We are only interested in reference objects/elements */

	if (source_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {

		/* Attempt to resolve the (named) reference to a namespace node */

		acpi_ds_resolve_package_element(element_ptr);
	} else if (source_object->common.type == ACPI_TYPE_PACKAGE) {
		source_object->package.flags |= AOPOBJ_DATA_VALID;
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_resolve_package_element
 *
 * PARAMETERS:  element_ptr         - Pointer to a reference object
 *
 * RETURN:      Possible new element is stored to the indirect element_ptr
 *
 * DESCRIPTION: Resolve a package element that is a reference to a named
 *              object.
 *
 ******************************************************************************/

static void
acpi_ds_resolve_package_element(union acpi_operand_object **element_ptr)
{
	acpi_status status;
	acpi_status status2;
	union acpi_generic_state scope_info;
	union acpi_operand_object *element = *element_ptr;
	struct acpi_namespace_node *resolved_node;
	struct acpi_namespace_node *original_node;
	char *external_path = "";
	acpi_object_type type;

	ACPI_FUNCTION_TRACE(ds_resolve_package_element);

	/* Check if reference element is already resolved */

	if (element->reference.resolved) {
		ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
				      "%s: Package element is already resolved\n",
				      ACPI_GET_FUNCTION_NAME));

		return_VOID;
	}

	/* Element must be a reference object of correct type */

	scope_info.scope.node = element->reference.node;	/* Prefix node */

	status = acpi_ns_lookup(&scope_info, (char *)element->reference.aml,
				ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
				ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
				NULL, &resolved_node);
	if (ACPI_FAILURE(status)) {
		if ((status == AE_NOT_FOUND)
		    && acpi_gbl_ignore_package_resolution_errors) {
			/*
			 * Optionally be silent about the NOT_FOUND case for the referenced
			 * name. Although this is potentially a serious problem,
			 * it can generate a lot of noise/errors on platforms whose
			 * firmware carries around a bunch of unused Package objects.
			 * To disable these errors, set this global to TRUE:
			 *     acpi_gbl_ignore_package_resolution_errors
			 *
			 * If the AML actually tries to use such a package, the unresolved
			 * element(s) will be replaced with NULL elements.
			 */

			/* Referenced name not found, set the element to NULL */

			acpi_ut_remove_reference(*element_ptr);
			*element_ptr = NULL;
			return_VOID;
		}

		status2 = acpi_ns_externalize_name(ACPI_UINT32_MAX,
						   (char *)element->reference.
						   aml, NULL, &external_path);

		ACPI_EXCEPTION((AE_INFO, status,
				"While resolving a named reference package element - %s",
				external_path));
		if (ACPI_SUCCESS(status2)) {
			ACPI_FREE(external_path);
		}

		/* Could not resolve name, set the element to NULL */

		acpi_ut_remove_reference(*element_ptr);
		*element_ptr = NULL;
		return_VOID;
	} else if (resolved_node->type == ACPI_TYPE_ANY) {

		/* Named reference not resolved, return a NULL package element */

		ACPI_ERROR((AE_INFO,
			    "Could not resolve named package element [%4.4s] in [%4.4s]",
			    resolved_node->name.ascii,
			    scope_info.scope.node->name.ascii));
		*element_ptr = NULL;
		return_VOID;
	}

	/*
	 * Special handling for Alias objects. We need resolved_node to point
	 * to the Alias target. This effectively "resolves" the alias.
	 */
	if (resolved_node->type == ACPI_TYPE_LOCAL_ALIAS) {
		resolved_node = ACPI_CAST_PTR(struct acpi_namespace_node,
					      resolved_node->object);
	}

	/* Update the reference object */

	element->reference.resolved = TRUE;
	element->reference.node = resolved_node;
	type = element->reference.node->type;

	/*
	 * Attempt to resolve the node to a value before we insert it into
	 * the package. If this is a reference to a common data type,
	 * resolve it immediately. According to the ACPI spec, package
	 * elements can only be "data objects" or method references.
	 * Attempt to resolve to an Integer, Buffer, String or Package.
	 * If cannot, return the named reference (for things like Devices,
	 * Methods, etc.) Buffer Fields and Fields will resolve to simple
	 * objects (int/buf/str/pkg).
	 *
	 * NOTE: References to things like Devices, Methods, Mutexes, etc.
	 * will remain as named references. This behavior is not described
	 * in the ACPI spec, but it appears to be an oversight.
	 */
	original_node = resolved_node;
	status = acpi_ex_resolve_node_to_value(&resolved_node, NULL);
	if (ACPI_FAILURE(status)) {
		return_VOID;
	}

	switch (type) {
		/*
		 * These object types are a result of named references, so we will
		 * leave them as reference objects. In other words, these types
		 * have no intrinsic "value".
		 */
	case ACPI_TYPE_DEVICE:
	case ACPI_TYPE_THERMAL:
	case ACPI_TYPE_METHOD:
		break;

	case ACPI_TYPE_MUTEX:
	case ACPI_TYPE_POWER:
	case ACPI_TYPE_PROCESSOR:
	case ACPI_TYPE_EVENT:
	case ACPI_TYPE_REGION:

		/* acpi_ex_resolve_node_to_value gave these an extra reference */

		acpi_ut_remove_reference(original_node->object);
		break;

	default:
		/*
		 * For all other types - the node was resolved to an actual
		 * operand object with a value, return the object. Remove
		 * a reference on the existing object.
		 */
		acpi_ut_remove_reference(element);
		*element_ptr = (union acpi_operand_object *)resolved_node;
		break;
	}

	return_VOID;
}