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1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: tbxfload - Table load/unload external interfaces | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2012, 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 | #include <linux/export.h> | |
45 | #include <acpi/acpi.h> | |
46 | #include "accommon.h" | |
47 | #include "acnamesp.h" | |
48 | #include "actables.h" | |
49 | ||
50 | #define _COMPONENT ACPI_TABLES | |
51 | ACPI_MODULE_NAME("tbxfload") | |
52 | ||
53 | /* Local prototypes */ | |
54 | static acpi_status acpi_tb_load_namespace(void); | |
55 | ||
56 | static int no_auto_ssdt; | |
57 | ||
58 | /******************************************************************************* | |
59 | * | |
60 | * FUNCTION: acpi_load_tables | |
61 | * | |
62 | * PARAMETERS: None | |
63 | * | |
64 | * RETURN: Status | |
65 | * | |
66 | * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT | |
67 | * | |
68 | ******************************************************************************/ | |
69 | ||
70 | acpi_status acpi_load_tables(void) | |
71 | { | |
72 | acpi_status status; | |
73 | ||
74 | ACPI_FUNCTION_TRACE(acpi_load_tables); | |
75 | ||
76 | /* Load the namespace from the tables */ | |
77 | ||
78 | status = acpi_tb_load_namespace(); | |
79 | if (ACPI_FAILURE(status)) { | |
80 | ACPI_EXCEPTION((AE_INFO, status, | |
81 | "While loading namespace from ACPI tables")); | |
82 | } | |
83 | ||
84 | return_ACPI_STATUS(status); | |
85 | } | |
86 | ||
87 | ACPI_EXPORT_SYMBOL(acpi_load_tables) | |
88 | ||
89 | /******************************************************************************* | |
90 | * | |
91 | * FUNCTION: acpi_tb_load_namespace | |
92 | * | |
93 | * PARAMETERS: None | |
94 | * | |
95 | * RETURN: Status | |
96 | * | |
97 | * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in | |
98 | * the RSDT/XSDT. | |
99 | * | |
100 | ******************************************************************************/ | |
101 | static acpi_status acpi_tb_load_namespace(void) | |
102 | { | |
103 | acpi_status status; | |
104 | u32 i; | |
105 | struct acpi_table_header *new_dsdt; | |
106 | ||
107 | ACPI_FUNCTION_TRACE(tb_load_namespace); | |
108 | ||
109 | (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); | |
110 | ||
111 | /* | |
112 | * Load the namespace. The DSDT is required, but any SSDT and | |
113 | * PSDT tables are optional. Verify the DSDT. | |
114 | */ | |
115 | if (!acpi_gbl_root_table_list.current_table_count || | |
116 | !ACPI_COMPARE_NAME(& | |
117 | (acpi_gbl_root_table_list. | |
118 | tables[ACPI_TABLE_INDEX_DSDT].signature), | |
119 | ACPI_SIG_DSDT) | |
120 | || | |
121 | ACPI_FAILURE(acpi_tb_verify_table | |
122 | (&acpi_gbl_root_table_list. | |
123 | tables[ACPI_TABLE_INDEX_DSDT]))) { | |
124 | status = AE_NO_ACPI_TABLES; | |
125 | goto unlock_and_exit; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Save the DSDT pointer for simple access. This is the mapped memory | |
130 | * address. We must take care here because the address of the .Tables | |
131 | * array can change dynamically as tables are loaded at run-time. Note: | |
132 | * .Pointer field is not validated until after call to acpi_tb_verify_table. | |
133 | */ | |
134 | acpi_gbl_DSDT = | |
135 | acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer; | |
136 | ||
137 | /* | |
138 | * Optionally copy the entire DSDT to local memory (instead of simply | |
139 | * mapping it.) There are some BIOSs that corrupt or replace the original | |
140 | * DSDT, creating the need for this option. Default is FALSE, do not copy | |
141 | * the DSDT. | |
142 | */ | |
143 | if (acpi_gbl_copy_dsdt_locally) { | |
144 | new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT); | |
145 | if (new_dsdt) { | |
146 | acpi_gbl_DSDT = new_dsdt; | |
147 | } | |
148 | } | |
149 | ||
150 | /* | |
151 | * Save the original DSDT header for detection of table corruption | |
152 | * and/or replacement of the DSDT from outside the OS. | |
153 | */ | |
154 | ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, | |
155 | sizeof(struct acpi_table_header)); | |
156 | ||
157 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
158 | ||
159 | /* Load and parse tables */ | |
160 | ||
161 | status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node); | |
162 | if (ACPI_FAILURE(status)) { | |
163 | return_ACPI_STATUS(status); | |
164 | } | |
165 | ||
166 | /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ | |
167 | ||
168 | (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); | |
169 | for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { | |
170 | if ((!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_verify_table | |
179 | (&acpi_gbl_root_table_list.tables[i]))) { | |
180 | continue; | |
181 | } | |
182 | ||
183 | if (no_auto_ssdt) { | |
184 | printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n"); | |
185 | continue; | |
186 | } | |
187 | ||
188 | /* Ignore errors while loading tables, get as many as possible */ | |
189 | ||
190 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
191 | (void)acpi_ns_load_table(i, acpi_gbl_root_node); | |
192 | (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); | |
193 | } | |
194 | ||
3e5621a7 | 195 | ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired")); |
d59b8ecd BM |
196 | |
197 | unlock_and_exit: | |
198 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
199 | return_ACPI_STATUS(status); | |
200 | } | |
201 | ||
f60d8181 BM |
202 | /******************************************************************************* |
203 | * | |
204 | * FUNCTION: acpi_load_table | |
205 | * | |
206 | * PARAMETERS: table - Pointer to a buffer containing the ACPI | |
207 | * table to be loaded. | |
208 | * | |
209 | * RETURN: Status | |
210 | * | |
211 | * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must | |
212 | * be a valid ACPI table with a valid ACPI table header. | |
213 | * Note1: Mainly intended to support hotplug addition of SSDTs. | |
691fda50 | 214 | * Note2: Does not copy the incoming table. User is responsible |
f60d8181 BM |
215 | * to ensure that the table is not deleted or unmapped. |
216 | * | |
217 | ******************************************************************************/ | |
218 | ||
219 | acpi_status acpi_load_table(struct acpi_table_header *table) | |
220 | { | |
221 | acpi_status status; | |
222 | struct acpi_table_desc table_desc; | |
223 | u32 table_index; | |
224 | ||
225 | ACPI_FUNCTION_TRACE(acpi_load_table); | |
226 | ||
227 | /* Parameter validation */ | |
228 | ||
229 | if (!table) { | |
230 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
231 | } | |
232 | ||
233 | /* Init local table descriptor */ | |
234 | ||
235 | ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc)); | |
236 | table_desc.address = ACPI_PTR_TO_PHYSADDR(table); | |
237 | table_desc.pointer = table; | |
238 | table_desc.length = table->length; | |
239 | table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN; | |
240 | ||
241 | /* Must acquire the interpreter lock during this operation */ | |
242 | ||
243 | status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); | |
244 | if (ACPI_FAILURE(status)) { | |
245 | return_ACPI_STATUS(status); | |
246 | } | |
247 | ||
248 | /* Install the table and load it into the namespace */ | |
249 | ||
250 | ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); | |
251 | status = acpi_tb_add_table(&table_desc, &table_index); | |
252 | if (ACPI_FAILURE(status)) { | |
253 | goto unlock_and_exit; | |
254 | } | |
255 | ||
256 | status = acpi_ns_load_table(table_index, acpi_gbl_root_node); | |
257 | ||
258 | /* Invoke table handler if present */ | |
259 | ||
260 | if (acpi_gbl_table_handler) { | |
261 | (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, | |
262 | acpi_gbl_table_handler_context); | |
263 | } | |
264 | ||
265 | unlock_and_exit: | |
266 | (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); | |
267 | return_ACPI_STATUS(status); | |
268 | } | |
269 | ||
270 | ACPI_EXPORT_SYMBOL(acpi_load_table) | |
271 | ||
272 | /******************************************************************************* | |
273 | * | |
274 | * FUNCTION: acpi_unload_parent_table | |
275 | * | |
276 | * PARAMETERS: object - Handle to any namespace object owned by | |
277 | * the table to be unloaded | |
278 | * | |
279 | * RETURN: Status | |
280 | * | |
281 | * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads | |
282 | * the table and deletes all namespace objects associated with | |
283 | * that table. Unloading of the DSDT is not allowed. | |
284 | * Note: Mainly intended to support hotplug removal of SSDTs. | |
285 | * | |
286 | ******************************************************************************/ | |
287 | acpi_status acpi_unload_parent_table(acpi_handle object) | |
288 | { | |
289 | struct acpi_namespace_node *node = | |
290 | ACPI_CAST_PTR(struct acpi_namespace_node, object); | |
291 | acpi_status status = AE_NOT_EXIST; | |
292 | acpi_owner_id owner_id; | |
293 | u32 i; | |
294 | ||
295 | ACPI_FUNCTION_TRACE(acpi_unload_parent_table); | |
296 | ||
297 | /* Parameter validation */ | |
298 | ||
299 | if (!object) { | |
300 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
301 | } | |
302 | ||
303 | /* | |
304 | * The node owner_id is currently the same as the parent table ID. | |
305 | * However, this could change in the future. | |
306 | */ | |
307 | owner_id = node->owner_id; | |
308 | if (!owner_id) { | |
309 | ||
310 | /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ | |
311 | ||
312 | return_ACPI_STATUS(AE_TYPE); | |
313 | } | |
314 | ||
315 | /* Must acquire the interpreter lock during this operation */ | |
316 | ||
317 | status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); | |
318 | if (ACPI_FAILURE(status)) { | |
319 | return_ACPI_STATUS(status); | |
320 | } | |
321 | ||
322 | /* Find the table in the global table list */ | |
323 | ||
324 | for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { | |
325 | if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { | |
326 | continue; | |
327 | } | |
328 | ||
329 | /* | |
330 | * Allow unload of SSDT and OEMx tables only. Do not allow unload | |
331 | * of the DSDT. No other types of tables should get here, since | |
332 | * only these types can contain AML and thus are the only types | |
333 | * that can create namespace objects. | |
334 | */ | |
335 | if (ACPI_COMPARE_NAME | |
336 | (acpi_gbl_root_table_list.tables[i].signature.ascii, | |
337 | ACPI_SIG_DSDT)) { | |
338 | status = AE_TYPE; | |
339 | break; | |
340 | } | |
341 | ||
342 | /* Ensure the table is actually loaded */ | |
343 | ||
344 | if (!acpi_tb_is_table_loaded(i)) { | |
345 | status = AE_NOT_EXIST; | |
346 | break; | |
347 | } | |
348 | ||
349 | /* Invoke table handler if present */ | |
350 | ||
351 | if (acpi_gbl_table_handler) { | |
352 | (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, | |
353 | acpi_gbl_root_table_list. | |
354 | tables[i].pointer, | |
355 | acpi_gbl_table_handler_context); | |
356 | } | |
357 | ||
358 | /* | |
359 | * Delete all namespace objects owned by this table. Note that | |
360 | * these objects can appear anywhere in the namespace by virtue | |
361 | * of the AML "Scope" operator. Thus, we need to track ownership | |
362 | * by an ID, not simply a position within the hierarchy. | |
363 | */ | |
364 | status = acpi_tb_delete_namespace_by_owner(i); | |
365 | if (ACPI_FAILURE(status)) { | |
366 | break; | |
367 | } | |
368 | ||
369 | status = acpi_tb_release_owner_id(i); | |
370 | acpi_tb_set_table_loaded_flag(i, FALSE); | |
371 | break; | |
372 | } | |
373 | ||
374 | (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); | |
375 | return_ACPI_STATUS(status); | |
376 | } | |
377 | ||
378 | ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) | |
379 | ||
d59b8ecd BM |
380 | static int __init acpi_no_auto_ssdt_setup(char *s) { |
381 | ||
382 | printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n"); | |
383 | ||
384 | no_auto_ssdt = 1; | |
385 | ||
386 | return 1; | |
387 | } | |
388 | ||
389 | __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup); |