1 /******************************************************************************
2 *
3 * Module Name: tbxfload - Table load/unload external interfaces
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2015, 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
51 #define _COMPONENT ACPI_TABLES
52 ACPI_MODULE_NAME("tbxfload")
53
54 /* Local prototypes */
55 static acpi_status acpi_tb_load_namespace(void);
56
57 /*******************************************************************************
58 *
59 * FUNCTION: acpi_load_tables
60 *
61 * PARAMETERS: None
62 *
63 * RETURN: Status
64 *
65 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
66 *
67 ******************************************************************************/
68
acpi_load_tables(void)69 acpi_status __init acpi_load_tables(void)
70 {
71 acpi_status status;
72
73 ACPI_FUNCTION_TRACE(acpi_load_tables);
74
75 /* Load the namespace from the tables */
76
77 status = acpi_tb_load_namespace();
78 if (ACPI_FAILURE(status)) {
79 ACPI_EXCEPTION((AE_INFO, status,
80 "While loading namespace from ACPI tables"));
81 }
82
83 return_ACPI_STATUS(status);
84 }
85
ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)86 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
87
88 /*******************************************************************************
89 *
90 * FUNCTION: acpi_tb_load_namespace
91 *
92 * PARAMETERS: None
93 *
94 * RETURN: Status
95 *
96 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
97 * the RSDT/XSDT.
98 *
99 ******************************************************************************/
100 static acpi_status acpi_tb_load_namespace(void)
101 {
102 acpi_status status;
103 u32 i;
104 struct acpi_table_header *new_dsdt;
105
106 ACPI_FUNCTION_TRACE(tb_load_namespace);
107
108 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
109
110 /*
111 * Load the namespace. The DSDT is required, but any SSDT and
112 * PSDT tables are optional. Verify the DSDT.
113 */
114 if (!acpi_gbl_root_table_list.current_table_count ||
115 !ACPI_COMPARE_NAME(&
116 (acpi_gbl_root_table_list.
117 tables[ACPI_TABLE_INDEX_DSDT].signature),
118 ACPI_SIG_DSDT)
119 ||
120 ACPI_FAILURE(acpi_tb_validate_table
121 (&acpi_gbl_root_table_list.
122 tables[ACPI_TABLE_INDEX_DSDT]))) {
123 status = AE_NO_ACPI_TABLES;
124 goto unlock_and_exit;
125 }
126
127 /*
128 * Save the DSDT pointer for simple access. This is the mapped memory
129 * address. We must take care here because the address of the .Tables
130 * array can change dynamically as tables are loaded at run-time. Note:
131 * .Pointer field is not validated until after call to acpi_tb_validate_table.
132 */
133 acpi_gbl_DSDT =
134 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
135
136 /*
137 * Optionally copy the entire DSDT to local memory (instead of simply
138 * mapping it.) There are some BIOSs that corrupt or replace the original
139 * DSDT, creating the need for this option. Default is FALSE, do not copy
140 * the DSDT.
141 */
142 if (acpi_gbl_copy_dsdt_locally) {
143 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
144 if (new_dsdt) {
145 acpi_gbl_DSDT = new_dsdt;
146 }
147 }
148
149 /*
150 * Save the original DSDT header for detection of table corruption
151 * and/or replacement of the DSDT from outside the OS.
152 */
153 ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
154 sizeof(struct acpi_table_header));
155
156 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
157
158 /* Load and parse tables */
159
160 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
161 if (ACPI_FAILURE(status)) {
162 return_ACPI_STATUS(status);
163 }
164
165 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
166
167 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
168 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
169 if (!acpi_gbl_root_table_list.tables[i].address ||
170 (!ACPI_COMPARE_NAME
171 (&(acpi_gbl_root_table_list.tables[i].signature),
172 ACPI_SIG_SSDT)
173 &&
174 !ACPI_COMPARE_NAME(&
175 (acpi_gbl_root_table_list.tables[i].
176 signature), ACPI_SIG_PSDT))
177 ||
178 ACPI_FAILURE(acpi_tb_validate_table
179 (&acpi_gbl_root_table_list.tables[i]))) {
180 continue;
181 }
182
183 /* Ignore errors while loading tables, get as many as possible */
184
185 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
186 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
187 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
188 }
189
190 ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired"));
191
192 unlock_and_exit:
193 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
194 return_ACPI_STATUS(status);
195 }
196
197 /*******************************************************************************
198 *
199 * FUNCTION: acpi_install_table
200 *
201 * PARAMETERS: address - Address of the ACPI table to be installed.
202 * physical - Whether the address is a physical table
203 * address or not
204 *
205 * RETURN: Status
206 *
207 * DESCRIPTION: Dynamically install an ACPI table.
208 * Note: This function should only be invoked after
209 * acpi_initialize_tables() and before acpi_load_tables().
210 *
211 ******************************************************************************/
212
213 acpi_status __init
acpi_install_table(acpi_physical_address address,u8 physical)214 acpi_install_table(acpi_physical_address address, u8 physical)
215 {
216 acpi_status status;
217 u8 flags;
218 u32 table_index;
219
220 ACPI_FUNCTION_TRACE(acpi_install_table);
221
222 if (physical) {
223 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
224 } else {
225 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
226 }
227
228 status = acpi_tb_install_standard_table(address, flags,
229 FALSE, FALSE, &table_index);
230
231 return_ACPI_STATUS(status);
232 }
233
ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)234 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
235
236 /*******************************************************************************
237 *
238 * FUNCTION: acpi_load_table
239 *
240 * PARAMETERS: table - Pointer to a buffer containing the ACPI
241 * table to be loaded.
242 *
243 * RETURN: Status
244 *
245 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
246 * be a valid ACPI table with a valid ACPI table header.
247 * Note1: Mainly intended to support hotplug addition of SSDTs.
248 * Note2: Does not copy the incoming table. User is responsible
249 * to ensure that the table is not deleted or unmapped.
250 *
251 ******************************************************************************/
252 acpi_status acpi_load_table(struct acpi_table_header *table)
253 {
254 acpi_status status;
255 u32 table_index;
256
257 ACPI_FUNCTION_TRACE(acpi_load_table);
258
259 /* Parameter validation */
260
261 if (!table) {
262 return_ACPI_STATUS(AE_BAD_PARAMETER);
263 }
264
265 /* Must acquire the interpreter lock during this operation */
266
267 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
268 if (ACPI_FAILURE(status)) {
269 return_ACPI_STATUS(status);
270 }
271
272 /* Install the table and load it into the namespace */
273
274 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
275 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
276
277 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
278 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
279 TRUE, FALSE, &table_index);
280
281 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
282 if (ACPI_FAILURE(status)) {
283 goto unlock_and_exit;
284 }
285
286 /*
287 * Note: Now table is "INSTALLED", it must be validated before
288 * using.
289 */
290 status =
291 acpi_tb_validate_table(&acpi_gbl_root_table_list.
292 tables[table_index]);
293 if (ACPI_FAILURE(status)) {
294 goto unlock_and_exit;
295 }
296
297 status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
298
299 /* Invoke table handler if present */
300
301 if (acpi_gbl_table_handler) {
302 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
303 acpi_gbl_table_handler_context);
304 }
305
306 unlock_and_exit:
307 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
308 return_ACPI_STATUS(status);
309 }
310
ACPI_EXPORT_SYMBOL(acpi_load_table)311 ACPI_EXPORT_SYMBOL(acpi_load_table)
312
313 /*******************************************************************************
314 *
315 * FUNCTION: acpi_unload_parent_table
316 *
317 * PARAMETERS: object - Handle to any namespace object owned by
318 * the table to be unloaded
319 *
320 * RETURN: Status
321 *
322 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
323 * the table and deletes all namespace objects associated with
324 * that table. Unloading of the DSDT is not allowed.
325 * Note: Mainly intended to support hotplug removal of SSDTs.
326 *
327 ******************************************************************************/
328 acpi_status acpi_unload_parent_table(acpi_handle object)
329 {
330 struct acpi_namespace_node *node =
331 ACPI_CAST_PTR(struct acpi_namespace_node, object);
332 acpi_status status = AE_NOT_EXIST;
333 acpi_owner_id owner_id;
334 u32 i;
335
336 ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
337
338 /* Parameter validation */
339
340 if (!object) {
341 return_ACPI_STATUS(AE_BAD_PARAMETER);
342 }
343
344 /*
345 * The node owner_id is currently the same as the parent table ID.
346 * However, this could change in the future.
347 */
348 owner_id = node->owner_id;
349 if (!owner_id) {
350
351 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
352
353 return_ACPI_STATUS(AE_TYPE);
354 }
355
356 /* Must acquire the interpreter lock during this operation */
357
358 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
359 if (ACPI_FAILURE(status)) {
360 return_ACPI_STATUS(status);
361 }
362
363 /* Find the table in the global table list */
364
365 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
366 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
367 continue;
368 }
369
370 /*
371 * Allow unload of SSDT and OEMx tables only. Do not allow unload
372 * of the DSDT. No other types of tables should get here, since
373 * only these types can contain AML and thus are the only types
374 * that can create namespace objects.
375 */
376 if (ACPI_COMPARE_NAME
377 (acpi_gbl_root_table_list.tables[i].signature.ascii,
378 ACPI_SIG_DSDT)) {
379 status = AE_TYPE;
380 break;
381 }
382
383 /* Ensure the table is actually loaded */
384
385 if (!acpi_tb_is_table_loaded(i)) {
386 status = AE_NOT_EXIST;
387 break;
388 }
389
390 /* Invoke table handler if present */
391
392 if (acpi_gbl_table_handler) {
393 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
394 acpi_gbl_root_table_list.
395 tables[i].pointer,
396 acpi_gbl_table_handler_context);
397 }
398
399 /*
400 * Delete all namespace objects owned by this table. Note that
401 * these objects can appear anywhere in the namespace by virtue
402 * of the AML "Scope" operator. Thus, we need to track ownership
403 * by an ID, not simply a position within the hierarchy.
404 */
405 status = acpi_tb_delete_namespace_by_owner(i);
406 if (ACPI_FAILURE(status)) {
407 break;
408 }
409
410 status = acpi_tb_release_owner_id(i);
411 acpi_tb_set_table_loaded_flag(i, FALSE);
412 break;
413 }
414
415 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
416 return_ACPI_STATUS(status);
417 }
418
419 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)
420