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1/******************************************************************************
2 *
3 * Module Name: tbxfload - Table load/unload external interfaces
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#define EXPORT_ACPI_INTERFACES
45
46#include <acpi/acpi.h>
47#include "accommon.h"
48#include "acnamesp.h"
49#include "actables.h"
50#include "acevents.h"
51
52#define _COMPONENT ACPI_TABLES
53ACPI_MODULE_NAME("tbxfload")
54
55/*******************************************************************************
56 *
57 * FUNCTION: acpi_load_tables
58 *
59 * PARAMETERS: None
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
64 *
65 ******************************************************************************/
66acpi_status __init acpi_load_tables(void)
67{
68 acpi_status status;
69
70 ACPI_FUNCTION_TRACE(acpi_load_tables);
71
72 /*
73 * Install the default operation region handlers. These are the
74 * handlers that are defined by the ACPI specification to be
75 * "always accessible" -- namely, system_memory, system_IO, and
76 * PCI_Config. This also means that no _REG methods need to be
77 * run for these address spaces. We need to have these handlers
78 * installed before any AML code can be executed, especially any
79 * module-level code (11/2015).
80 * Note that we allow OSPMs to install their own region handlers
81 * between acpi_initialize_subsystem() and acpi_load_tables() to use
82 * their customized default region handlers.
83 */
84 status = acpi_ev_install_region_handlers();
85 if (ACPI_FAILURE(status) && status != AE_ALREADY_EXISTS) {
86 ACPI_EXCEPTION((AE_INFO, status,
87 "During Region initialization"));
88 return_ACPI_STATUS(status);
89 }
90
91 /* Load the namespace from the tables */
92
93 status = acpi_tb_load_namespace();
94
95 /* Don't let single failures abort the load */
96
97 if (status == AE_CTRL_TERMINATE) {
98 status = AE_OK;
99 }
100
101 if (ACPI_FAILURE(status)) {
102 ACPI_EXCEPTION((AE_INFO, status,
103 "While loading namespace from ACPI tables"));
104 }
105
106 if (!acpi_gbl_group_module_level_code) {
107 /*
108 * Initialize the objects that remain uninitialized. This
109 * runs the executable AML that may be part of the
110 * declaration of these objects:
111 * operation_regions, buffer_fields, Buffers, and Packages.
112 */
113 status = acpi_ns_initialize_objects();
114 if (ACPI_FAILURE(status)) {
115 return_ACPI_STATUS(status);
116 }
117 }
118
119 acpi_gbl_namespace_initialized = TRUE;
120 return_ACPI_STATUS(status);
121}
122
123ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
124
125/*******************************************************************************
126 *
127 * FUNCTION: acpi_tb_load_namespace
128 *
129 * PARAMETERS: None
130 *
131 * RETURN: Status
132 *
133 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
134 * the RSDT/XSDT.
135 *
136 ******************************************************************************/
137acpi_status acpi_tb_load_namespace(void)
138{
139 acpi_status status;
140 u32 i;
141 struct acpi_table_header *new_dsdt;
142 struct acpi_table_desc *table;
143 u32 tables_loaded = 0;
144 u32 tables_failed = 0;
145
146 ACPI_FUNCTION_TRACE(tb_load_namespace);
147
148 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
149
150 /*
151 * Load the namespace. The DSDT is required, but any SSDT and
152 * PSDT tables are optional. Verify the DSDT.
153 */
154 table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];
155
156 if (!acpi_gbl_root_table_list.current_table_count ||
157 !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) ||
158 ACPI_FAILURE(acpi_tb_validate_table(table))) {
159 status = AE_NO_ACPI_TABLES;
160 goto unlock_and_exit;
161 }
162
163 /*
164 * Save the DSDT pointer for simple access. This is the mapped memory
165 * address. We must take care here because the address of the .Tables
166 * array can change dynamically as tables are loaded at run-time. Note:
167 * .Pointer field is not validated until after call to acpi_tb_validate_table.
168 */
169 acpi_gbl_DSDT = table->pointer;
170
171 /*
172 * Optionally copy the entire DSDT to local memory (instead of simply
173 * mapping it.) There are some BIOSs that corrupt or replace the original
174 * DSDT, creating the need for this option. Default is FALSE, do not copy
175 * the DSDT.
176 */
177 if (acpi_gbl_copy_dsdt_locally) {
178 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
179 if (new_dsdt) {
180 acpi_gbl_DSDT = new_dsdt;
181 }
182 }
183
184 /*
185 * Save the original DSDT header for detection of table corruption
186 * and/or replacement of the DSDT from outside the OS.
187 */
188 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
189 sizeof(struct acpi_table_header));
190
191 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
192
193 /* Load and parse tables */
194
195 status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
196 if (ACPI_FAILURE(status)) {
197 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
198 tables_failed++;
199 } else {
200 tables_loaded++;
201 }
202
203 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
204
205 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
206 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
207 table = &acpi_gbl_root_table_list.tables[i];
208
209 if (!acpi_gbl_root_table_list.tables[i].address ||
210 (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT)
211 && !ACPI_COMPARE_NAME(table->signature.ascii,
212 ACPI_SIG_PSDT)
213 && !ACPI_COMPARE_NAME(table->signature.ascii,
214 ACPI_SIG_OSDT))
215 || ACPI_FAILURE(acpi_tb_validate_table(table))) {
216 continue;
217 }
218
219 /* Ignore errors while loading tables, get as many as possible */
220
221 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
222 status = acpi_ns_load_table(i, acpi_gbl_root_node);
223 if (ACPI_FAILURE(status)) {
224 ACPI_EXCEPTION((AE_INFO, status,
225 "(%4.4s:%8.8s) while loading table",
226 table->signature.ascii,
227 table->pointer->oem_table_id));
228
229 tables_failed++;
230
231 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
232 "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
233 table->signature.ascii,
234 table->pointer->oem_table_id));
235 } else {
236 tables_loaded++;
237 }
238
239 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
240 }
241
242 if (!tables_failed) {
243 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded\n", tables_loaded));
244 } else {
245 ACPI_ERROR((AE_INFO,
246 "%u table load failures, %u successful",
247 tables_failed, tables_loaded));
248
249 /* Indicate at least one failure */
250
251 status = AE_CTRL_TERMINATE;
252 }
253
254unlock_and_exit:
255 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
256 return_ACPI_STATUS(status);
257}
258
259/*******************************************************************************
260 *
261 * FUNCTION: acpi_install_table
262 *
263 * PARAMETERS: address - Address of the ACPI table to be installed.
264 * physical - Whether the address is a physical table
265 * address or not
266 *
267 * RETURN: Status
268 *
269 * DESCRIPTION: Dynamically install an ACPI table.
270 * Note: This function should only be invoked after
271 * acpi_initialize_tables() and before acpi_load_tables().
272 *
273 ******************************************************************************/
274
275acpi_status __init
276acpi_install_table(acpi_physical_address address, u8 physical)
277{
278 acpi_status status;
279 u8 flags;
280 u32 table_index;
281
282 ACPI_FUNCTION_TRACE(acpi_install_table);
283
284 if (physical) {
285 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
286 } else {
287 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
288 }
289
290 status = acpi_tb_install_standard_table(address, flags,
291 FALSE, FALSE, &table_index);
292
293 return_ACPI_STATUS(status);
294}
295
296ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
297
298/*******************************************************************************
299 *
300 * FUNCTION: acpi_load_table
301 *
302 * PARAMETERS: table - Pointer to a buffer containing the ACPI
303 * table to be loaded.
304 *
305 * RETURN: Status
306 *
307 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
308 * be a valid ACPI table with a valid ACPI table header.
309 * Note1: Mainly intended to support hotplug addition of SSDTs.
310 * Note2: Does not copy the incoming table. User is responsible
311 * to ensure that the table is not deleted or unmapped.
312 *
313 ******************************************************************************/
314acpi_status acpi_load_table(struct acpi_table_header *table)
315{
316 acpi_status status;
317 u32 table_index;
318
319 ACPI_FUNCTION_TRACE(acpi_load_table);
320
321 /* Parameter validation */
322
323 if (!table) {
324 return_ACPI_STATUS(AE_BAD_PARAMETER);
325 }
326
327 /* Must acquire the interpreter lock during this operation */
328
329 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
330 if (ACPI_FAILURE(status)) {
331 return_ACPI_STATUS(status);
332 }
333
334 /* Install the table and load it into the namespace */
335
336 ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
337 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
338
339 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
340 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
341 TRUE, FALSE, &table_index);
342
343 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
344 if (ACPI_FAILURE(status)) {
345 goto unlock_and_exit;
346 }
347
348 /*
349 * Note: Now table is "INSTALLED", it must be validated before
350 * using.
351 */
352 status =
353 acpi_tb_validate_table(&acpi_gbl_root_table_list.
354 tables[table_index]);
355 if (ACPI_FAILURE(status)) {
356 goto unlock_and_exit;
357 }
358
359 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
360
361 /* Invoke table handler if present */
362
363 if (acpi_gbl_table_handler) {
364 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
365 acpi_gbl_table_handler_context);
366 }
367
368unlock_and_exit:
369 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
370 return_ACPI_STATUS(status);
371}
372
373ACPI_EXPORT_SYMBOL(acpi_load_table)
374
375/*******************************************************************************
376 *
377 * FUNCTION: acpi_unload_parent_table
378 *
379 * PARAMETERS: object - Handle to any namespace object owned by
380 * the table to be unloaded
381 *
382 * RETURN: Status
383 *
384 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
385 * the table and deletes all namespace objects associated with
386 * that table. Unloading of the DSDT is not allowed.
387 * Note: Mainly intended to support hotplug removal of SSDTs.
388 *
389 ******************************************************************************/
390acpi_status acpi_unload_parent_table(acpi_handle object)
391{
392 struct acpi_namespace_node *node =
393 ACPI_CAST_PTR(struct acpi_namespace_node, object);
394 acpi_status status = AE_NOT_EXIST;
395 acpi_owner_id owner_id;
396 u32 i;
397
398 ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
399
400 /* Parameter validation */
401
402 if (!object) {
403 return_ACPI_STATUS(AE_BAD_PARAMETER);
404 }
405
406 /*
407 * The node owner_id is currently the same as the parent table ID.
408 * However, this could change in the future.
409 */
410 owner_id = node->owner_id;
411 if (!owner_id) {
412
413 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
414
415 return_ACPI_STATUS(AE_TYPE);
416 }
417
418 /* Must acquire the interpreter lock during this operation */
419
420 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
421 if (ACPI_FAILURE(status)) {
422 return_ACPI_STATUS(status);
423 }
424
425 /* Find the table in the global table list */
426
427 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
428 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
429 continue;
430 }
431
432 /*
433 * Allow unload of SSDT and OEMx tables only. Do not allow unload
434 * of the DSDT. No other types of tables should get here, since
435 * only these types can contain AML and thus are the only types
436 * that can create namespace objects.
437 */
438 if (ACPI_COMPARE_NAME
439 (acpi_gbl_root_table_list.tables[i].signature.ascii,
440 ACPI_SIG_DSDT)) {
441 status = AE_TYPE;
442 break;
443 }
444
445 /* Ensure the table is actually loaded */
446
447 if (!acpi_tb_is_table_loaded(i)) {
448 status = AE_NOT_EXIST;
449 break;
450 }
451
452 /* Invoke table handler if present */
453
454 if (acpi_gbl_table_handler) {
455 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
456 acpi_gbl_root_table_list.
457 tables[i].pointer,
458 acpi_gbl_table_handler_context);
459 }
460
461 /*
462 * Delete all namespace objects owned by this table. Note that
463 * these objects can appear anywhere in the namespace by virtue
464 * of the AML "Scope" operator. Thus, we need to track ownership
465 * by an ID, not simply a position within the hierarchy.
466 */
467 status = acpi_tb_delete_namespace_by_owner(i);
468 if (ACPI_FAILURE(status)) {
469 break;
470 }
471
472 status = acpi_tb_release_owner_id(i);
473 acpi_tb_set_table_loaded_flag(i, FALSE);
474 break;
475 }
476
477 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
478 return_ACPI_STATUS(status);
479}
480
481ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)