summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/tbxface.c
blob: dca91b6f8cc2b8b2011d3c84b36b7144b0b53b25 (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
552
553
554
555
556
557
558
559
560
561
562
563
564
/******************************************************************************
 *
 * Module Name: tbxface - ACPI table-oriented external interfaces
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2018, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#define EXPORT_ACPI_INTERFACES

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

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbxface")

/*******************************************************************************
 *
 * FUNCTION:    acpi_allocate_root_table
 *
 * PARAMETERS:  initial_table_count - Size of initial_table_array, in number of
 *                                    struct acpi_table_desc structures
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
 *              acpi_initialize_tables.
 *
 ******************************************************************************/
acpi_status acpi_allocate_root_table(u32 initial_table_count)
{

	acpi_gbl_root_table_list.max_table_count = initial_table_count;
	acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;

	return (acpi_tb_resize_root_table_list());
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_initialize_tables
 *
 * PARAMETERS:  initial_table_array - Pointer to an array of pre-allocated
 *                                    struct acpi_table_desc structures. If NULL, the
 *                                    array is dynamically allocated.
 *              initial_table_count - Size of initial_table_array, in number of
 *                                    struct acpi_table_desc structures
 *              allow_resize        - Flag to tell Table Manager if resize of
 *                                    pre-allocated array is allowed. Ignored
 *                                    if initial_table_array is NULL.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
 *
 * NOTE:        Allows static allocation of the initial table array in order
 *              to avoid the use of dynamic memory in confined environments
 *              such as the kernel boot sequence where it may not be available.
 *
 *              If the host OS memory managers are initialized, use NULL for
 *              initial_table_array, and the table will be dynamically allocated.
 *
 ******************************************************************************/

acpi_status ACPI_INIT_FUNCTION
acpi_initialize_tables(struct acpi_table_desc *initial_table_array,
		       u32 initial_table_count, u8 allow_resize)
{
	acpi_physical_address rsdp_address;
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_initialize_tables);

	/*
	 * Setup the Root Table Array and allocate the table array
	 * if requested
	 */
	if (!initial_table_array) {
		status = acpi_allocate_root_table(initial_table_count);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	} else {
		/* Root Table Array has been statically allocated by the host */

		memset(initial_table_array, 0,
		       (acpi_size)initial_table_count *
		       sizeof(struct acpi_table_desc));

		acpi_gbl_root_table_list.tables = initial_table_array;
		acpi_gbl_root_table_list.max_table_count = initial_table_count;
		acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
		if (allow_resize) {
			acpi_gbl_root_table_list.flags |=
			    ACPI_ROOT_ALLOW_RESIZE;
		}
	}

	/* Get the address of the RSDP */

	rsdp_address = acpi_os_get_root_pointer();
	if (!rsdp_address) {
		return_ACPI_STATUS(AE_NOT_FOUND);
	}

	/*
	 * Get the root table (RSDT or XSDT) and extract all entries to the local
	 * Root Table Array. This array contains the information of the RSDT/XSDT
	 * in a common, more useable format.
	 */
	status = acpi_tb_parse_root_table(rsdp_address);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_tables)

/*******************************************************************************
 *
 * FUNCTION:    acpi_reallocate_root_table
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
 *              root list from the previously provided scratch area. Should
 *              be called once dynamic memory allocation is available in the
 *              kernel.
 *
 ******************************************************************************/
acpi_status ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
{
	acpi_status status;
	struct acpi_table_desc *table_desc;
	u32 i, j;

	ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);

	/*
	 * If there are tables unverified, it is required to reallocate the
	 * root table list to clean up invalid table entries. Otherwise only
	 * reallocate the root table list if the host provided a static buffer
	 * for the table array in the call to acpi_initialize_tables().
	 */
	if ((acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) &&
	    acpi_gbl_enable_table_validation) {
		return_ACPI_STATUS(AE_SUPPORT);
	}

	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

	/*
	 * Ensure OS early boot logic, which is required by some hosts. If the
	 * table state is reported to be wrong, developers should fix the
	 * issue by invoking acpi_put_table() for the reported table during the
	 * early stage.
	 */
	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
		table_desc = &acpi_gbl_root_table_list.tables[i];
		if (table_desc->pointer) {
			ACPI_ERROR((AE_INFO,
				    "Table [%4.4s] is not invalidated during early boot stage",
				    table_desc->signature.ascii));
		}
	}

	if (!acpi_gbl_enable_table_validation) {
		/*
		 * Now it's safe to do full table validation. We can do deferred
		 * table initilization here once the flag is set.
		 */
		acpi_gbl_enable_table_validation = TRUE;
		for (i = 0; i < acpi_gbl_root_table_list.current_table_count;
		     ++i) {
			table_desc = &acpi_gbl_root_table_list.tables[i];
			if (!(table_desc->flags & ACPI_TABLE_IS_VERIFIED)) {
				status =
				    acpi_tb_verify_temp_table(table_desc, NULL,
							      &j);
				if (ACPI_FAILURE(status)) {
					acpi_tb_uninstall_table(table_desc);
				}
			}
		}
	}

	acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
	status = acpi_tb_resize_root_table_list();
	acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;

	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL_INIT(acpi_reallocate_root_table)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_table_header
 *
 * PARAMETERS:  signature           - ACPI signature of needed table
 *              instance            - Which instance (for SSDTs)
 *              out_table_header    - The pointer to the table header to fill
 *
 * RETURN:      Status and pointer to mapped table header
 *
 * DESCRIPTION: Finds an ACPI table header.
 *
 * NOTE:        Caller is responsible in unmapping the header with
 *              acpi_os_unmap_memory
 *
 ******************************************************************************/
acpi_status
acpi_get_table_header(char *signature,
		      u32 instance, struct acpi_table_header *out_table_header)
{
	u32 i;
	u32 j;
	struct acpi_table_header *header;

	/* Parameter validation */

	if (!signature || !out_table_header) {
		return (AE_BAD_PARAMETER);
	}

	/* Walk the root table list */

	for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
	     i++) {
		if (!ACPI_COMPARE_NAME
		    (&(acpi_gbl_root_table_list.tables[i].signature),
		     signature)) {
			continue;
		}

		if (++j < instance) {
			continue;
		}

		if (!acpi_gbl_root_table_list.tables[i].pointer) {
			if ((acpi_gbl_root_table_list.tables[i].flags &
			     ACPI_TABLE_ORIGIN_MASK) ==
			    ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL) {
				header =
				    acpi_os_map_memory(acpi_gbl_root_table_list.
						       tables[i].address,
						       sizeof(struct
							      acpi_table_header));
				if (!header) {
					return (AE_NO_MEMORY);
				}

				memcpy(out_table_header, header,
				       sizeof(struct acpi_table_header));
				acpi_os_unmap_memory(header,
						     sizeof(struct
							    acpi_table_header));
			} else {
				return (AE_NOT_FOUND);
			}
		} else {
			memcpy(out_table_header,
			       acpi_gbl_root_table_list.tables[i].pointer,
			       sizeof(struct acpi_table_header));
		}
		return (AE_OK);
	}

	return (AE_NOT_FOUND);
}

ACPI_EXPORT_SYMBOL(acpi_get_table_header)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_table
 *
 * PARAMETERS:  signature           - ACPI signature of needed table
 *              instance            - Which instance (for SSDTs)
 *              out_table           - Where the pointer to the table is returned
 *
 * RETURN:      Status and pointer to the requested table
 *
 * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
 *              RSDT/XSDT.
 *              Note that an early stage acpi_get_table() call must be paired
 *              with an early stage acpi_put_table() call. otherwise the table
 *              pointer mapped by the early stage mapping implementation may be
 *              erroneously unmapped by the late stage unmapping implementation
 *              in an acpi_put_table() invoked during the late stage.
 *
 ******************************************************************************/
acpi_status
acpi_get_table(char *signature,
	       u32 instance, struct acpi_table_header ** out_table)
{
	u32 i;
	u32 j;
	acpi_status status = AE_NOT_FOUND;
	struct acpi_table_desc *table_desc;

	/* Parameter validation */

	if (!signature || !out_table) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * Note that the following line is required by some OSPMs, they only
	 * check if the returned table is NULL instead of the returned status
	 * to determined if this function is succeeded.
	 */
	*out_table = NULL;

	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

	/* Walk the root table list */

	for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
	     i++) {
		table_desc = &acpi_gbl_root_table_list.tables[i];

		if (!ACPI_COMPARE_NAME(&table_desc->signature, signature)) {
			continue;
		}

		if (++j < instance) {
			continue;
		}

		status = acpi_tb_get_table(table_desc, out_table);
		break;
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
	return (status);
}

ACPI_EXPORT_SYMBOL(acpi_get_table)

/*******************************************************************************
 *
 * FUNCTION:    acpi_put_table
 *
 * PARAMETERS:  table               - The pointer to the table
 *
 * RETURN:      None
 *
 * DESCRIPTION: Release a table returned by acpi_get_table() and its clones.
 *              Note that it is not safe if this function was invoked after an
 *              uninstallation happened to the original table descriptor.
 *              Currently there is no OSPMs' requirement to handle such
 *              situations.
 *
 ******************************************************************************/
void acpi_put_table(struct acpi_table_header *table)
{
	u32 i;
	struct acpi_table_desc *table_desc;

	ACPI_FUNCTION_TRACE(acpi_put_table);

	if (!table) {
		return_VOID;
	}

	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

	/* Walk the root table list */

	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
		table_desc = &acpi_gbl_root_table_list.tables[i];

		if (table_desc->pointer != table) {
			continue;
		}

		acpi_tb_put_table(table_desc);
		break;
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
	return_VOID;
}

ACPI_EXPORT_SYMBOL(acpi_put_table)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_table_by_index
 *
 * PARAMETERS:  table_index         - Table index
 *              out_table           - Where the pointer to the table is returned
 *
 * RETURN:      Status and pointer to the requested table
 *
 * DESCRIPTION: Obtain a table by an index into the global table list. Used
 *              internally also.
 *
 ******************************************************************************/
acpi_status
acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_get_table_by_index);

	/* Parameter validation */

	if (!out_table) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * Note that the following line is required by some OSPMs, they only
	 * check if the returned table is NULL instead of the returned status
	 * to determined if this function is succeeded.
	 */
	*out_table = NULL;

	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

	/* Validate index */

	if (table_index >= acpi_gbl_root_table_list.current_table_count) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	status =
	    acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
			      out_table);

unlock_and_exit:
	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)

/*******************************************************************************
 *
 * FUNCTION:    acpi_install_table_handler
 *
 * PARAMETERS:  handler         - Table event handler
 *              context         - Value passed to the handler on each event
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a global table event handler.
 *
 ******************************************************************************/
acpi_status
acpi_install_table_handler(acpi_table_handler handler, void *context)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_install_table_handler);

	if (!handler) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Don't allow more than one handler */

	if (acpi_gbl_table_handler) {
		status = AE_ALREADY_EXISTS;
		goto cleanup;
	}

	/* Install the handler */

	acpi_gbl_table_handler = handler;
	acpi_gbl_table_handler_context = context;

cleanup:
	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_install_table_handler)

/*******************************************************************************
 *
 * FUNCTION:    acpi_remove_table_handler
 *
 * PARAMETERS:  handler         - Table event handler that was installed
 *                                previously.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a table event handler
 *
 ******************************************************************************/
acpi_status acpi_remove_table_handler(acpi_table_handler handler)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_remove_table_handler);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Make sure that the installed handler is the same */

	if (!handler || handler != acpi_gbl_table_handler) {
		status = AE_BAD_PARAMETER;
		goto cleanup;
	}

	/* Remove the handler */

	acpi_gbl_table_handler = NULL;

cleanup:
	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
OpenPOWER on IntegriCloud