summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/exconfig.c
blob: d7d74ef87b186164b1e45e9a19279df192f743d3 (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
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
 *
 * Copyright (C) 2000 - 2022, Intel Corp.
 *
 *****************************************************************************/

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

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exconfig")

/* Local prototypes */
static acpi_status
acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle);

static acpi_status
acpi_ex_region_read(union acpi_operand_object *obj_desc,
		    u32 length, u8 *buffer);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_add_table
 *
 * PARAMETERS:  table               - Pointer to raw table
 *              parent_node         - Where to load the table (scope)
 *              ddb_handle          - Where to return the table handle.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Common function to Install and Load an ACPI table with a
 *              returned table handle.
 *
 ******************************************************************************/

static acpi_status
acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle)
{
	union acpi_operand_object *obj_desc;

	ACPI_FUNCTION_TRACE(ex_add_table);

	/* Create an object to be the table handle */

	obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
	if (!obj_desc) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Init the table handle */

	obj_desc->common.flags |= AOPOBJ_DATA_VALID;
	obj_desc->reference.class = ACPI_REFCLASS_TABLE;
	obj_desc->reference.value = table_index;
	*ddb_handle = obj_desc;
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_load_table_op
 *
 * PARAMETERS:  walk_state          - Current state with operands
 *              return_desc         - Where to store the return object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 *
 ******************************************************************************/

acpi_status
acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
		      union acpi_operand_object **return_desc)
{
	acpi_status status;
	union acpi_operand_object **operand = &walk_state->operands[0];
	struct acpi_namespace_node *parent_node;
	struct acpi_namespace_node *start_node;
	struct acpi_namespace_node *parameter_node = NULL;
	union acpi_operand_object *return_obj;
	union acpi_operand_object *ddb_handle;
	u32 table_index;

	ACPI_FUNCTION_TRACE(ex_load_table_op);

	/* Create the return object */

	return_obj = acpi_ut_create_integer_object((u64)0);
	if (!return_obj) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	*return_desc = return_obj;

	/* Find the ACPI table in the RSDT/XSDT */

	acpi_ex_exit_interpreter();
	status = acpi_tb_find_table(operand[0]->string.pointer,
				    operand[1]->string.pointer,
				    operand[2]->string.pointer, &table_index);
	acpi_ex_enter_interpreter();
	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND) {
			return_ACPI_STATUS(status);
		}

		/* Table not found, return an Integer=0 and AE_OK */

		return_ACPI_STATUS(AE_OK);
	}

	/* Default nodes */

	start_node = walk_state->scope_info->scope.node;
	parent_node = acpi_gbl_root_node;

	/* root_path (optional parameter) */

	if (operand[3]->string.length > 0) {
		/*
		 * Find the node referenced by the root_path_string. This is the
		 * location within the namespace where the table will be loaded.
		 */
		status = acpi_ns_get_node_unlocked(start_node,
						   operand[3]->string.pointer,
						   ACPI_NS_SEARCH_PARENT,
						   &parent_node);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* parameter_path (optional parameter) */

	if (operand[4]->string.length > 0) {
		if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
		    (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
			/*
			 * Path is not absolute, so it will be relative to the node
			 * referenced by the root_path_string (or the NS root if omitted)
			 */
			start_node = parent_node;
		}

		/* Find the node referenced by the parameter_path_string */

		status = acpi_ns_get_node_unlocked(start_node,
						   operand[4]->string.pointer,
						   ACPI_NS_SEARCH_PARENT,
						   &parameter_node);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* Load the table into the namespace */

	ACPI_INFO(("Dynamic OEM Table Load:"));
	acpi_ex_exit_interpreter();
	status = acpi_tb_load_table(table_index, parent_node);
	acpi_ex_enter_interpreter();
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_ex_add_table(table_index, &ddb_handle);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Complete the initialization/resolution of new objects */

	acpi_ex_exit_interpreter();
	acpi_ns_initialize_objects();
	acpi_ex_enter_interpreter();

	/* Parameter Data (optional) */

	if (parameter_node) {

		/* Store the parameter data into the optional parameter object */

		status = acpi_ex_store(operand[5],
				       ACPI_CAST_PTR(union acpi_operand_object,
						     parameter_node),
				       walk_state);
		if (ACPI_FAILURE(status)) {
			(void)acpi_ex_unload_table(ddb_handle);

			acpi_ut_remove_reference(ddb_handle);
			return_ACPI_STATUS(status);
		}
	}

	/* Remove the reference to ddb_handle created by acpi_ex_add_table above */

	acpi_ut_remove_reference(ddb_handle);

	/* Return -1 (non-zero) indicates success */

	return_obj->integer.value = 0xFFFFFFFFFFFFFFFF;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_region_read
 *
 * PARAMETERS:  obj_desc        - Region descriptor
 *              length          - Number of bytes to read
 *              buffer          - Pointer to where to put the data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Read data from an operation region. The read starts from the
 *              beginning of the region.
 *
 ******************************************************************************/

static acpi_status
acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
{
	acpi_status status;
	u64 value;
	u32 region_offset = 0;
	u32 i;

	/* Bytewise reads */

	for (i = 0; i < length; i++) {
		status =
		    acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
						   region_offset, 8, &value);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		*buffer = (u8)value;
		buffer++;
		region_offset++;
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_load_op
 *
 * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 *                                obtained
 *              target          - Where the status of the load will be stored
 *              walk_state      - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load an ACPI table from a field or operation region
 *
 * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 *       objects before this code is reached.
 *
 *       If source is an operation region, it must refer to system_memory, as
 *       per the ACPI specification.
 *
 ******************************************************************************/

acpi_status
acpi_ex_load_op(union acpi_operand_object *obj_desc,
		union acpi_operand_object *target,
		struct acpi_walk_state *walk_state)
{
	union acpi_operand_object *ddb_handle;
	struct acpi_table_header *table_header;
	struct acpi_table_header *table;
	u32 table_index;
	acpi_status status;
	u32 length;

	ACPI_FUNCTION_TRACE(ex_load_op);

	if (target->common.descriptor_type == ACPI_DESC_TYPE_NAMED) {
		target =
		    acpi_ns_get_attached_object(ACPI_CAST_PTR
						(struct acpi_namespace_node,
						 target));
	}
	if (target->common.type != ACPI_TYPE_INTEGER) {
		ACPI_EXCEPTION((AE_INFO, AE_TYPE,
				"Type not integer: %X\n", target->common.type));
		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	target->integer.value = 0;

	/* Source Object can be either an op_region or a Buffer/Field */

	switch (obj_desc->common.type) {
	case ACPI_TYPE_REGION:

		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Load table from Region %p\n", obj_desc));

		/* Region must be system_memory (from ACPI spec) */

		if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/*
		 * If the Region Address and Length have not been previously
		 * evaluated, evaluate them now and save the results.
		 */
		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
			status = acpi_ds_get_region_arguments(obj_desc);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}

		/* Get the table header first so we can get the table length */

		table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
		if (!table_header) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		status =
		    acpi_ex_region_read(obj_desc,
					sizeof(struct acpi_table_header),
					ACPI_CAST_PTR(u8, table_header));
		length = table_header->length;
		ACPI_FREE(table_header);

		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		/* Must have at least an ACPI table header */

		if (length < sizeof(struct acpi_table_header)) {
			return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
		}

		/*
		 * The original implementation simply mapped the table, with no copy.
		 * However, the memory region is not guaranteed to remain stable and
		 * we must copy the table to a local buffer. For example, the memory
		 * region is corrupted after suspend on some machines. Dynamically
		 * loaded tables are usually small, so this overhead is minimal.
		 *
		 * The latest implementation (5/2009) does not use a mapping at all.
		 * We use the low-level operation region interface to read the table
		 * instead of the obvious optimization of using a direct mapping.
		 * This maintains a consistent use of operation regions across the
		 * entire subsystem. This is important if additional processing must
		 * be performed in the (possibly user-installed) operation region
		 * handler. For example, acpi_exec and ASLTS depend on this.
		 */

		/* Allocate a buffer for the table */

		table = ACPI_ALLOCATE(length);
		if (!table) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Read the entire table */

		status = acpi_ex_region_read(obj_desc, length,
					     ACPI_CAST_PTR(u8, table));
		if (ACPI_FAILURE(status)) {
			ACPI_FREE(table);
			return_ACPI_STATUS(status);
		}
		break;

	case ACPI_TYPE_BUFFER:	/* Buffer or resolved region_field */

		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Load table from Buffer or Field %p\n",
				  obj_desc));

		/* Must have at least an ACPI table header */

		if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
			return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
		}

		/* Get the actual table length from the table header */

		table_header =
		    ACPI_CAST_PTR(struct acpi_table_header,
				  obj_desc->buffer.pointer);
		length = table_header->length;

		/* Table cannot extend beyond the buffer */

		if (length > obj_desc->buffer.length) {
			return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
		}
		if (length < sizeof(struct acpi_table_header)) {
			return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
		}

		/*
		 * Copy the table from the buffer because the buffer could be
		 * modified or even deleted in the future
		 */
		table = ACPI_ALLOCATE(length);
		if (!table) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		memcpy(table, table_header, length);
		break;

	default:

		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	/* Install the new table into the local data structures */

	ACPI_INFO(("Dynamic OEM Table Load:"));
	acpi_ex_exit_interpreter();
	status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
						ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
						table, TRUE, &table_index);
	acpi_ex_enter_interpreter();
	if (ACPI_FAILURE(status)) {

		/* Delete allocated table buffer */

		ACPI_FREE(table);
		return_ACPI_STATUS(status);
	}

	/*
	 * Add the table to the namespace.
	 *
	 * Note: Load the table objects relative to the root of the namespace.
	 * This appears to go against the ACPI specification, but we do it for
	 * compatibility with other ACPI implementations.
	 */
	status = acpi_ex_add_table(table_index, &ddb_handle);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Complete the initialization/resolution of new objects */

	acpi_ex_exit_interpreter();
	acpi_ns_initialize_objects();
	acpi_ex_enter_interpreter();

	/* Remove the reference to ddb_handle created by acpi_ex_add_table above */

	acpi_ut_remove_reference(ddb_handle);

	/* Return -1 (non-zero) indicates success */

	target->integer.value = 0xFFFFFFFFFFFFFFFF;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_unload_table
 *
 * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Unload an ACPI table
 *
 ******************************************************************************/

acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *table_desc = ddb_handle;
	u32 table_index;

	ACPI_FUNCTION_TRACE(ex_unload_table);

	/*
	 * Temporarily emit a warning so that the ASL for the machine can be
	 * hopefully obtained. This is to say that the Unload() operator is
	 * extremely rare if not completely unused.
	 */
	ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));

	/*
	 * May 2018: Unload is no longer supported for the following reasons:
	 * 1) A correct implementation on some hosts may not be possible.
	 * 2) Other ACPI implementations do not correctly/fully support it.
	 * 3) It requires host device driver support which does not exist.
	 *    (To properly support namespace unload out from underneath.)
	 * 4) This AML operator has never been seen in the field.
	 */
	ACPI_EXCEPTION((AE_INFO, AE_NOT_IMPLEMENTED,
			"AML Unload operator is not supported"));

	/*
	 * Validate the handle
	 * Although the handle is partially validated in acpi_ex_reconfiguration()
	 * when it calls acpi_ex_resolve_operands(), the handle is more completely
	 * validated here.
	 *
	 * Handle must be a valid operand object of type reference. Also, the
	 * ddb_handle must still be marked valid (table has not been previously
	 * unloaded)
	 */
	if ((!ddb_handle) ||
	    (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
	    (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
	    (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	/* Get the table index from the ddb_handle */

	table_index = table_desc->reference.value;

	/*
	 * Release the interpreter lock so that the table lock won't have
	 * strict order requirement against it.
	 */
	acpi_ex_exit_interpreter();
	status = acpi_tb_unload_table(table_index);
	acpi_ex_enter_interpreter();

	/*
	 * Invalidate the handle. We do this because the handle may be stored
	 * in a named object and may not be actually deleted until much later.
	 */
	if (ACPI_SUCCESS(status)) {
		ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
	}
	return_ACPI_STATUS(status);
}