summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/namespace/nseval.c
blob: 80ef955456366b3e052abd2845f7bbb0c714ec61 (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
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
/*******************************************************************************
 *
 * Module Name: nseval - Object evaluation interfaces -- includes control
 *                       method lookup and execution.
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2006, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/acparser.h>
#include <acpi/acinterp.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nseval")

/* Local prototypes */
static acpi_status
acpi_ns_execute_control_method(struct acpi_parameter_info *info);

static acpi_status acpi_ns_get_object_value(struct acpi_parameter_info *info);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_relative
 *
 * PARAMETERS:  Pathname        - Name of method to execute, If NULL, the
 *                                handle is the object to execute
 *              Info            - Method info block, contains:
 *                  return_object   - Where to put method's return value (if
 *                                    any).  If NULL, no value is returned.
 *                  Params          - List of parameters to pass to the method,
 *                                    terminated by NULL.  Params itself may be
 *                                    NULL if no parameters are being passed.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Evaluate the object or find and execute the requested method
 *
 * MUTEX:       Locks Namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_evaluate_relative(char *pathname, struct acpi_parameter_info *info)
{
	acpi_status status;
	struct acpi_namespace_node *node = NULL;
	union acpi_generic_state *scope_info;
	char *internal_path = NULL;

	ACPI_FUNCTION_TRACE("ns_evaluate_relative");

	/*
	 * Must have a valid object handle
	 */
	if (!info || !info->node) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Build an internal name string for the method */

	status = acpi_ns_internalize_name(pathname, &internal_path);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	scope_info = acpi_ut_create_generic_state();
	if (!scope_info) {
		goto cleanup1;
	}

	/* Get the prefix handle and Node */

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	info->node = acpi_ns_map_handle_to_node(info->node);
	if (!info->node) {
		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
		status = AE_BAD_PARAMETER;
		goto cleanup;
	}

	/* Lookup the name in the namespace */

	scope_info->scope.node = info->node;
	status = acpi_ns_lookup(scope_info, internal_path, ACPI_TYPE_ANY,
				ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
				&node);

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Object [%s] not found [%s]\n",
				  pathname, acpi_format_exception(status)));
		goto cleanup;
	}

	/*
	 * Now that we have a handle to the object, we can attempt to evaluate it.
	 */
	ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
			  pathname, node, acpi_ns_get_attached_object(node)));

	info->node = node;
	status = acpi_ns_evaluate_by_handle(info);

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
			  "*** Completed eval of object %s ***\n", pathname));

      cleanup:
	acpi_ut_delete_generic_state(scope_info);

      cleanup1:
	ACPI_MEM_FREE(internal_path);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_by_name
 *
 * PARAMETERS:  Pathname        - Fully qualified pathname to the object
 *              Info                - Method info block, contains:
 *                  return_object   - Where to put method's return value (if
 *                                    any).  If NULL, no value is returned.
 *                  Params          - List of parameters to pass to the method,
 *                                    terminated by NULL.  Params itself may be
 *                                    NULL if no parameters are being passed.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Evaluate the object or rind and execute the requested method
 *              passing the given parameters
 *
 * MUTEX:       Locks Namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_evaluate_by_name(char *pathname, struct acpi_parameter_info *info)
{
	acpi_status status;
	char *internal_path = NULL;

	ACPI_FUNCTION_TRACE("ns_evaluate_by_name");

	/* Build an internal name string for the method */

	status = acpi_ns_internalize_name(pathname, &internal_path);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/* Lookup the name in the namespace */

	status = acpi_ns_lookup(NULL, internal_path, ACPI_TYPE_ANY,
				ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
				&info->node);

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
				  "Object at [%s] was not found, status=%.4X\n",
				  pathname, status));
		goto cleanup;
	}

	/*
	 * Now that we have a handle to the object, we can attempt to evaluate it.
	 */
	ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
			  pathname, info->node,
			  acpi_ns_get_attached_object(info->node)));

	status = acpi_ns_evaluate_by_handle(info);

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
			  "*** Completed eval of object %s ***\n", pathname));

      cleanup:

	/* Cleanup */

	if (internal_path) {
		ACPI_MEM_FREE(internal_path);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_by_handle
 *
 * PARAMETERS:  Info            - Method info block, contains:
 *                  Node            - Method/Object Node to execute
 *                  Parameters      - List of parameters to pass to the method,
 *                                    terminated by NULL. Params itself may be
 *                                    NULL if no parameters are being passed.
 *                  return_object   - Where to put method's return value (if
 *                                    any). If NULL, no value is returned.
 *                  parameter_type  - Type of Parameter list
 *                  return_object   - Where to put method's return value (if
 *                                    any). If NULL, no value is returned.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Evaluate object or execute the requested method passing the
 *              given parameters
 *
 * MUTEX:       Locks Namespace
 *
 ******************************************************************************/

acpi_status acpi_ns_evaluate_by_handle(struct acpi_parameter_info *info)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("ns_evaluate_by_handle");

	/* Check if namespace has been initialized */

	if (!acpi_gbl_root_node) {
		return_ACPI_STATUS(AE_NO_NAMESPACE);
	}

	/* Parameter Validation */

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

	/* Initialize the return value to an invalid object */

	info->return_object = NULL;

	/* Get the prefix handle and Node */

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

	info->node = acpi_ns_map_handle_to_node(info->node);
	if (!info->node) {
		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * For a method alias, we must grab the actual method node so that proper
	 * scoping context will be established before execution.
	 */
	if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
		info->node =
		    ACPI_CAST_PTR(struct acpi_namespace_node,
				  info->node->object);
	}

	/*
	 * Two major cases here:
	 * 1) The object is an actual control method -- execute it.
	 * 2) The object is not a method -- just return it's current value
	 *
	 * In both cases, the namespace is unlocked by the acpi_ns* procedure
	 */
	if (acpi_ns_get_type(info->node) == ACPI_TYPE_METHOD) {
		/*
		 * Case 1) We have an actual control method to execute
		 */
		status = acpi_ns_execute_control_method(info);
	} else {
		/*
		 * Case 2) Object is NOT a method, just return its current value
		 */
		status = acpi_ns_get_object_value(info);
	}

	/*
	 * Check if there is a return value on the stack that must be dealt with
	 */
	if (status == AE_CTRL_RETURN_VALUE) {

		/* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */

		status = AE_OK;
	}

	/*
	 * Namespace was unlocked by the handling acpi_ns* function, so we
	 * just return
	 */
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_execute_control_method
 *
 * PARAMETERS:  Info            - Method info block, contains:
 *                  Node            - Method Node to execute
 *                  obj_desc        - Method object
 *                  Parameters      - List of parameters to pass to the method,
 *                                    terminated by NULL. Params itself may be
 *                                    NULL if no parameters are being passed.
 *                  return_object   - Where to put method's return value (if
 *                                    any). If NULL, no value is returned.
 *                  parameter_type  - Type of Parameter list
 *                  return_object   - Where to put method's return value (if
 *                                    any). If NULL, no value is returned.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute the requested method passing the given parameters
 *
 * MUTEX:       Assumes namespace is locked
 *
 ******************************************************************************/

static acpi_status
acpi_ns_execute_control_method(struct acpi_parameter_info *info)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("ns_execute_control_method");

	/* Verify that there is a method associated with this object */

	info->obj_desc = acpi_ns_get_attached_object(info->node);
	if (!info->obj_desc) {
		ACPI_ERROR((AE_INFO, "No attached method object"));

		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
		return_ACPI_STATUS(AE_NULL_OBJECT);
	}

	ACPI_DUMP_PATHNAME(info->node, "Execute Method:",
			   ACPI_LV_INFO, _COMPONENT);

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Method at AML address %p Length %X\n",
			  info->obj_desc->method.aml_start + 1,
			  info->obj_desc->method.aml_length - 1));

	/*
	 * Unlock the namespace before execution.  This allows namespace access
	 * via the external Acpi* interfaces while a method is being executed.
	 * However, any namespace deletion must acquire both the namespace and
	 * interpreter locks to ensure that no thread is using the portion of the
	 * namespace that is being deleted.
	 */
	status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Execute the method via the interpreter.  The interpreter is locked
	 * here before calling into the AML parser
	 */
	status = acpi_ex_enter_interpreter();
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_ps_execute_method(info);
	acpi_ex_exit_interpreter();

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_object_value
 *
 * PARAMETERS:  Info            - Method info block, contains:
 *                  Node            - Object's NS node
 *                  return_object   - Where to put object value (if
 *                                    any). If NULL, no value is returned.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Return the current value of the object
 *
 * MUTEX:       Assumes namespace is locked, leaves namespace unlocked
 *
 ******************************************************************************/

static acpi_status acpi_ns_get_object_value(struct acpi_parameter_info *info)
{
	acpi_status status = AE_OK;
	struct acpi_namespace_node *resolved_node = info->node;

	ACPI_FUNCTION_TRACE("ns_get_object_value");

	/*
	 * Objects require additional resolution steps (e.g., the Node may be a
	 * field that must be read, etc.) -- we can't just grab the object out of
	 * the node.
	 */

	/*
	 * Use resolve_node_to_value() to get the associated value. This call always
	 * deletes obj_desc (allocated above).
	 *
	 * NOTE: we can get away with passing in NULL for a walk state because
	 * obj_desc is guaranteed to not be a reference to either a method local or
	 * a method argument (because this interface can only be called from the
	 * acpi_evaluate external interface, never called from a running method.)
	 *
	 * Even though we do not directly invoke the interpreter for this, we must
	 * enter it because we could access an opregion. The opregion access code
	 * assumes that the interpreter is locked.
	 *
	 * We must release the namespace lock before entering the intepreter.
	 */
	status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_ex_enter_interpreter();
	if (ACPI_SUCCESS(status)) {
		status = acpi_ex_resolve_node_to_value(&resolved_node, NULL);
		/*
		 * If acpi_ex_resolve_node_to_value() succeeded, the return value was placed
		 * in resolved_node.
		 */
		acpi_ex_exit_interpreter();

		if (ACPI_SUCCESS(status)) {
			status = AE_CTRL_RETURN_VALUE;
			info->return_object = ACPI_CAST_PTR
			    (union acpi_operand_object, resolved_node);
			ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
					  "Returning object %p [%s]\n",
					  info->return_object,
					  acpi_ut_get_object_type_name(info->
								       return_object)));
		}
	}

	/* Namespace is unlocked */

	return_ACPI_STATUS(status);
}
OpenPOWER on IntegriCloud