1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3  *
4  * Module Name: tbxfload - Table load/unload external interfaces
5  *
6  * Copyright (C) 2000 - 2021, Intel Corp.
7  *
8  *****************************************************************************/
9 
10 #define EXPORT_ACPI_INTERFACES
11 
12 #include <acpi/acpi.h>
13 #include "accommon.h"
14 #include "acnamesp.h"
15 #include "actables.h"
16 #include "acevents.h"
17 
18 #define _COMPONENT          ACPI_TABLES
19 ACPI_MODULE_NAME("tbxfload")
20 
21 /*******************************************************************************
22  *
23  * FUNCTION:    acpi_load_tables
24  *
25  * PARAMETERS:  None
26  *
27  * RETURN:      Status
28  *
29  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
30  *
31  ******************************************************************************/
acpi_load_tables(void)32 acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void)
33 {
34 	acpi_status status;
35 
36 	ACPI_FUNCTION_TRACE(acpi_load_tables);
37 
38 	/*
39 	 * Install the default operation region handlers. These are the
40 	 * handlers that are defined by the ACPI specification to be
41 	 * "always accessible" -- namely, system_memory, system_IO, and
42 	 * PCI_Config. This also means that no _REG methods need to be
43 	 * run for these address spaces. We need to have these handlers
44 	 * installed before any AML code can be executed, especially any
45 	 * module-level code (11/2015).
46 	 * Note that we allow OSPMs to install their own region handlers
47 	 * between acpi_initialize_subsystem() and acpi_load_tables() to use
48 	 * their customized default region handlers.
49 	 */
50 	status = acpi_ev_install_region_handlers();
51 	if (ACPI_FAILURE(status)) {
52 		ACPI_EXCEPTION((AE_INFO, status,
53 				"During Region initialization"));
54 		return_ACPI_STATUS(status);
55 	}
56 
57 	/* Load the namespace from the tables */
58 
59 	status = acpi_tb_load_namespace();
60 
61 	/* Don't let single failures abort the load */
62 
63 	if (status == AE_CTRL_TERMINATE) {
64 		status = AE_OK;
65 	}
66 
67 	if (ACPI_FAILURE(status)) {
68 		ACPI_EXCEPTION((AE_INFO, status,
69 				"While loading namespace from ACPI tables"));
70 	}
71 
72 	/*
73 	 * Initialize the objects in the namespace that remain uninitialized.
74 	 * This runs the executable AML that may be part of the declaration of
75 	 * these name objects:
76 	 *     operation_regions, buffer_fields, Buffers, and Packages.
77 	 *
78 	 */
79 	status = acpi_ns_initialize_objects();
80 	if (ACPI_SUCCESS(status)) {
81 		acpi_gbl_namespace_initialized = TRUE;
82 	}
83 
84 	return_ACPI_STATUS(status);
85 }
86 
ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)87 ACPI_EXPORT_SYMBOL_INIT(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 acpi_status acpi_tb_load_namespace(void)
102 {
103 	acpi_status status;
104 	u32 i;
105 	struct acpi_table_header *new_dsdt;
106 	struct acpi_table_desc *table;
107 	u32 tables_loaded = 0;
108 	u32 tables_failed = 0;
109 
110 	ACPI_FUNCTION_TRACE(tb_load_namespace);
111 
112 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
113 
114 	/*
115 	 * Load the namespace. The DSDT is required, but any SSDT and
116 	 * PSDT tables are optional. Verify the DSDT.
117 	 */
118 	table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];
119 
120 	if (!acpi_gbl_root_table_list.current_table_count ||
121 	    !ACPI_COMPARE_NAMESEG(table->signature.ascii, ACPI_SIG_DSDT) ||
122 	    ACPI_FAILURE(acpi_tb_validate_table(table))) {
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 = table->pointer;
134 
135 	/*
136 	 * Optionally copy the entire DSDT to local memory (instead of simply
137 	 * mapping it.) There are some BIOSs that corrupt or replace the original
138 	 * DSDT, creating the need for this option. Default is FALSE, do not copy
139 	 * the DSDT.
140 	 */
141 	if (acpi_gbl_copy_dsdt_locally) {
142 		new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
143 		if (new_dsdt) {
144 			acpi_gbl_DSDT = new_dsdt;
145 		}
146 	}
147 
148 	/*
149 	 * Save the original DSDT header for detection of table corruption
150 	 * and/or replacement of the DSDT from outside the OS.
151 	 */
152 	memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
153 	       sizeof(struct acpi_table_header));
154 
155 	/* Load and parse tables */
156 
157 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
158 	status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
159 	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
160 	if (ACPI_FAILURE(status)) {
161 		ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
162 		tables_failed++;
163 	} else {
164 		tables_loaded++;
165 	}
166 
167 	/* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
168 
169 	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
170 		table = &acpi_gbl_root_table_list.tables[i];
171 
172 		if (!table->address ||
173 		    (!ACPI_COMPARE_NAMESEG
174 		     (table->signature.ascii, ACPI_SIG_SSDT)
175 		     && !ACPI_COMPARE_NAMESEG(table->signature.ascii,
176 					      ACPI_SIG_PSDT)
177 		     && !ACPI_COMPARE_NAMESEG(table->signature.ascii,
178 					      ACPI_SIG_OSDT))
179 		    || ACPI_FAILURE(acpi_tb_validate_table(table))) {
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 		status = acpi_ns_load_table(i, acpi_gbl_root_node);
187 		(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
188 		if (ACPI_FAILURE(status)) {
189 			ACPI_EXCEPTION((AE_INFO, status,
190 					"(%4.4s:%8.8s) while loading table",
191 					table->signature.ascii,
192 					table->pointer->oem_table_id));
193 
194 			tables_failed++;
195 
196 			ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
197 					      "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
198 					      table->signature.ascii,
199 					      table->pointer->oem_table_id));
200 		} else {
201 			tables_loaded++;
202 		}
203 	}
204 
205 	if (!tables_failed) {
206 		ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", tables_loaded));
207 	} else {
208 		ACPI_ERROR((AE_INFO,
209 			    "%u table load failures, %u successful",
210 			    tables_failed, tables_loaded));
211 
212 		/* Indicate at least one failure */
213 
214 		status = AE_CTRL_TERMINATE;
215 	}
216 
217 #ifdef ACPI_APPLICATION
218 	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n"));
219 #endif
220 
221 unlock_and_exit:
222 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
223 	return_ACPI_STATUS(status);
224 }
225 
226 /*******************************************************************************
227  *
228  * FUNCTION:    acpi_install_table
229  *
230  * PARAMETERS:  address             - Address of the ACPI table to be installed.
231  *              physical            - Whether the address is a physical table
232  *                                    address or not
233  *
234  * RETURN:      Status
235  *
236  * DESCRIPTION: Dynamically install an ACPI table.
237  *              Note: This function should only be invoked after
238  *                    acpi_initialize_tables() and before acpi_load_tables().
239  *
240  ******************************************************************************/
241 
242 acpi_status ACPI_INIT_FUNCTION
acpi_install_table(acpi_physical_address address,u8 physical)243 acpi_install_table(acpi_physical_address address, u8 physical)
244 {
245 	acpi_status status;
246 	u8 flags;
247 	u32 table_index;
248 
249 	ACPI_FUNCTION_TRACE(acpi_install_table);
250 
251 	if (physical) {
252 		flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
253 	} else {
254 		flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
255 	}
256 
257 	status = acpi_tb_install_standard_table(address, flags,
258 						FALSE, FALSE, &table_index);
259 
260 	return_ACPI_STATUS(status);
261 }
262 
ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)263 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
264 
265 /*******************************************************************************
266  *
267  * FUNCTION:    acpi_load_table
268  *
269  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
270  *                                    table to be loaded.
271  *              table_idx           - Pointer to a u32 for storing the table
272  *                                    index, might be NULL
273  *
274  * RETURN:      Status
275  *
276  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
277  *              be a valid ACPI table with a valid ACPI table header.
278  *              Note1: Mainly intended to support hotplug addition of SSDTs.
279  *              Note2: Does not copy the incoming table. User is responsible
280  *              to ensure that the table is not deleted or unmapped.
281  *
282  ******************************************************************************/
283 acpi_status acpi_load_table(struct acpi_table_header *table, u32 *table_idx)
284 {
285 	acpi_status status;
286 	u32 table_index;
287 
288 	ACPI_FUNCTION_TRACE(acpi_load_table);
289 
290 	/* Parameter validation */
291 
292 	if (!table) {
293 		return_ACPI_STATUS(AE_BAD_PARAMETER);
294 	}
295 
296 	/* Install the table and load it into the namespace */
297 
298 	ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
299 	status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
300 						ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
301 						FALSE, &table_index);
302 	if (table_idx) {
303 		*table_idx = table_index;
304 	}
305 
306 	if (ACPI_SUCCESS(status)) {
307 
308 		/* Complete the initialization/resolution of new objects */
309 
310 		acpi_ns_initialize_objects();
311 	}
312 
313 	return_ACPI_STATUS(status);
314 }
315 
ACPI_EXPORT_SYMBOL(acpi_load_table)316 ACPI_EXPORT_SYMBOL(acpi_load_table)
317 
318 /*******************************************************************************
319  *
320  * FUNCTION:    acpi_unload_parent_table
321  *
322  * PARAMETERS:  object              - Handle to any namespace object owned by
323  *                                    the table to be unloaded
324  *
325  * RETURN:      Status
326  *
327  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
328  *              the table and deletes all namespace objects associated with
329  *              that table. Unloading of the DSDT is not allowed.
330  *              Note: Mainly intended to support hotplug removal of SSDTs.
331  *
332  ******************************************************************************/
333 acpi_status acpi_unload_parent_table(acpi_handle object)
334 {
335 	struct acpi_namespace_node *node =
336 	    ACPI_CAST_PTR(struct acpi_namespace_node, object);
337 	acpi_status status = AE_NOT_EXIST;
338 	acpi_owner_id owner_id;
339 	u32 i;
340 
341 	ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
342 
343 	/* Parameter validation */
344 
345 	if (!object) {
346 		return_ACPI_STATUS(AE_BAD_PARAMETER);
347 	}
348 
349 	/*
350 	 * The node owner_id is currently the same as the parent table ID.
351 	 * However, this could change in the future.
352 	 */
353 	owner_id = node->owner_id;
354 	if (!owner_id) {
355 
356 		/* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
357 
358 		return_ACPI_STATUS(AE_TYPE);
359 	}
360 
361 	/* Must acquire the table lock during this operation */
362 
363 	status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
364 	if (ACPI_FAILURE(status)) {
365 		return_ACPI_STATUS(status);
366 	}
367 
368 	/* Find the table in the global table list */
369 
370 	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
371 		if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
372 			continue;
373 		}
374 
375 		/*
376 		 * Allow unload of SSDT and OEMx tables only. Do not allow unload
377 		 * of the DSDT. No other types of tables should get here, since
378 		 * only these types can contain AML and thus are the only types
379 		 * that can create namespace objects.
380 		 */
381 		if (ACPI_COMPARE_NAMESEG
382 		    (acpi_gbl_root_table_list.tables[i].signature.ascii,
383 		     ACPI_SIG_DSDT)) {
384 			status = AE_TYPE;
385 			break;
386 		}
387 
388 		(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
389 		status = acpi_tb_unload_table(i);
390 		(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
391 		break;
392 	}
393 
394 	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
395 	return_ACPI_STATUS(status);
396 }
397 
ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)398 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)
399 /*******************************************************************************
400  *
401  * FUNCTION:    acpi_unload_table
402  *
403  * PARAMETERS:  table_index         - Index as returned by acpi_load_table
404  *
405  * RETURN:      Status
406  *
407  * DESCRIPTION: Via the table_index representing an SSDT or OEMx table, unloads
408  *              the table and deletes all namespace objects associated with
409  *              that table. Unloading of the DSDT is not allowed.
410  *              Note: Mainly intended to support hotplug removal of SSDTs.
411  *
412  ******************************************************************************/
413 acpi_status acpi_unload_table(u32 table_index)
414 {
415 	acpi_status status;
416 
417 	ACPI_FUNCTION_TRACE(acpi_unload_table);
418 
419 	if (table_index == 1) {
420 
421 		/* table_index==1 means DSDT is the owner. DSDT cannot be unloaded */
422 
423 		return_ACPI_STATUS(AE_TYPE);
424 	}
425 
426 	status = acpi_tb_unload_table(table_index);
427 	return_ACPI_STATUS(status);
428 }
429 
430 ACPI_EXPORT_SYMBOL(acpi_unload_table)
431