summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/tbxfload.c
blob: d86ce6eca61439871aeb43f43b874971e5ad2c5a (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
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: tbxfload - Table load/unload external interfaces
 *
 * Copyright (C) 2000 - 2018, Intel Corp.
 *
 *****************************************************************************/

#define EXPORT_ACPI_INTERFACES

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

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbxfload")

/*******************************************************************************
 *
 * FUNCTION:    acpi_load_tables
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
 *
 ******************************************************************************/
acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_load_tables);

	/*
	 * Install the default operation region handlers. These are the
	 * handlers that are defined by the ACPI specification to be
	 * "always accessible" -- namely, system_memory, system_IO, and
	 * PCI_Config. This also means that no _REG methods need to be
	 * run for these address spaces. We need to have these handlers
	 * installed before any AML code can be executed, especially any
	 * module-level code (11/2015).
	 * Note that we allow OSPMs to install their own region handlers
	 * between acpi_initialize_subsystem() and acpi_load_tables() to use
	 * their customized default region handlers.
	 */
	status = acpi_ev_install_region_handlers();
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status,
				"During Region initialization"));
		return_ACPI_STATUS(status);
	}

	/* Load the namespace from the tables */

	status = acpi_tb_load_namespace();

	/* Don't let single failures abort the load */

	if (status == AE_CTRL_TERMINATE) {
		status = AE_OK;
	}

	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status,
				"While loading namespace from ACPI tables"));
	}

	if (acpi_gbl_execute_tables_as_methods
	    || !acpi_gbl_group_module_level_code) {
		/*
		 * Initialize the objects that remain uninitialized. This
		 * runs the executable AML that may be part of the
		 * declaration of these objects:
		 * operation_regions, buffer_fields, Buffers, and Packages.
		 */
		status = acpi_ns_initialize_objects();
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	acpi_gbl_namespace_initialized = TRUE;
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_load_namespace
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 *              the RSDT/XSDT.
 *
 ******************************************************************************/
acpi_status acpi_tb_load_namespace(void)
{
	acpi_status status;
	u32 i;
	struct acpi_table_header *new_dsdt;
	struct acpi_table_desc *table;
	u32 tables_loaded = 0;
	u32 tables_failed = 0;

	ACPI_FUNCTION_TRACE(tb_load_namespace);

	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);

	/*
	 * Load the namespace. The DSDT is required, but any SSDT and
	 * PSDT tables are optional. Verify the DSDT.
	 */
	table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];

	if (!acpi_gbl_root_table_list.current_table_count ||
	    !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) ||
	    ACPI_FAILURE(acpi_tb_validate_table(table))) {
		status = AE_NO_ACPI_TABLES;
		goto unlock_and_exit;
	}

	/*
	 * Save the DSDT pointer for simple access. This is the mapped memory
	 * address. We must take care here because the address of the .Tables
	 * array can change dynamically as tables are loaded at run-time. Note:
	 * .Pointer field is not validated until after call to acpi_tb_validate_table.
	 */
	acpi_gbl_DSDT = table->pointer;

	/*
	 * Optionally copy the entire DSDT to local memory (instead of simply
	 * mapping it.) There are some BIOSs that corrupt or replace the original
	 * DSDT, creating the need for this option. Default is FALSE, do not copy
	 * the DSDT.
	 */
	if (acpi_gbl_copy_dsdt_locally) {
		new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
		if (new_dsdt) {
			acpi_gbl_DSDT = new_dsdt;
		}
	}

	/*
	 * Save the original DSDT header for detection of table corruption
	 * and/or replacement of the DSDT from outside the OS.
	 */
	memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
	       sizeof(struct acpi_table_header));

	/* Load and parse tables */

	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
	status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
		tables_failed++;
	} else {
		tables_loaded++;
	}

	/* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */

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

		if (!table->address ||
		    (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT)
		     && !ACPI_COMPARE_NAME(table->signature.ascii,
					   ACPI_SIG_PSDT)
		     && !ACPI_COMPARE_NAME(table->signature.ascii,
					   ACPI_SIG_OSDT))
		    || ACPI_FAILURE(acpi_tb_validate_table(table))) {
			continue;
		}

		/* Ignore errors while loading tables, get as many as possible */

		(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
		status = acpi_ns_load_table(i, acpi_gbl_root_node);
		(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status,
					"(%4.4s:%8.8s) while loading table",
					table->signature.ascii,
					table->pointer->oem_table_id));

			tables_failed++;

			ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
					      "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
					      table->signature.ascii,
					      table->pointer->oem_table_id));
		} else {
			tables_loaded++;
		}
	}

	if (!tables_failed) {
		ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", tables_loaded));
	} else {
		ACPI_ERROR((AE_INFO,
			    "%u table load failures, %u successful",
			    tables_failed, tables_loaded));

		/* Indicate at least one failure */

		status = AE_CTRL_TERMINATE;
	}

#ifdef ACPI_APPLICATION
	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n"));
#endif

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

/*******************************************************************************
 *
 * FUNCTION:    acpi_install_table
 *
 * PARAMETERS:  address             - Address of the ACPI table to be installed.
 *              physical            - Whether the address is a physical table
 *                                    address or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Dynamically install an ACPI table.
 *              Note: This function should only be invoked after
 *                    acpi_initialize_tables() and before acpi_load_tables().
 *
 ******************************************************************************/

acpi_status ACPI_INIT_FUNCTION
acpi_install_table(acpi_physical_address address, u8 physical)
{
	acpi_status status;
	u8 flags;
	u32 table_index;

	ACPI_FUNCTION_TRACE(acpi_install_table);

	if (physical) {
		flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
	} else {
		flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
	}

	status = acpi_tb_install_standard_table(address, flags,
						FALSE, FALSE, &table_index);

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)

/*******************************************************************************
 *
 * FUNCTION:    acpi_load_table
 *
 * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 *                                    table to be loaded.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 *              be a valid ACPI table with a valid ACPI table header.
 *              Note1: Mainly intended to support hotplug addition of SSDTs.
 *              Note2: Does not copy the incoming table. User is responsible
 *              to ensure that the table is not deleted or unmapped.
 *
 ******************************************************************************/
acpi_status acpi_load_table(struct acpi_table_header *table)
{
	acpi_status status;
	u32 table_index;

	ACPI_FUNCTION_TRACE(acpi_load_table);

	/* Parameter validation */

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

	/* Install the table and load it into the namespace */

	ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
	status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
						ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
						FALSE, &table_index);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_load_table)

/*******************************************************************************
 *
 * FUNCTION:    acpi_unload_parent_table
 *
 * PARAMETERS:  object              - Handle to any namespace object owned by
 *                                    the table to be unloaded
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 *              the table and deletes all namespace objects associated with
 *              that table. Unloading of the DSDT is not allowed.
 *              Note: Mainly intended to support hotplug removal of SSDTs.
 *
 ******************************************************************************/
acpi_status acpi_unload_parent_table(acpi_handle object)
{
	struct acpi_namespace_node *node =
	    ACPI_CAST_PTR(struct acpi_namespace_node, object);
	acpi_status status = AE_NOT_EXIST;
	acpi_owner_id owner_id;
	u32 i;

	ACPI_FUNCTION_TRACE(acpi_unload_parent_table);

	/* Parameter validation */

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

	/*
	 * The node owner_id is currently the same as the parent table ID.
	 * However, this could change in the future.
	 */
	owner_id = node->owner_id;
	if (!owner_id) {

		/* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */

		return_ACPI_STATUS(AE_TYPE);
	}

	/* Must acquire the table lock during this operation */

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

	/* Find the table in the global table list */

	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
		if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
			continue;
		}

		/*
		 * Allow unload of SSDT and OEMx tables only. Do not allow unload
		 * of the DSDT. No other types of tables should get here, since
		 * only these types can contain AML and thus are the only types
		 * that can create namespace objects.
		 */
		if (ACPI_COMPARE_NAME
		    (acpi_gbl_root_table_list.tables[i].signature.ascii,
		     ACPI_SIG_DSDT)) {
			status = AE_TYPE;
			break;
		}

		(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
		status = acpi_tb_unload_table(i);
		(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
		break;
	}

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

ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)