aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/nsinit.c
blob: 9bd6f050f299ef55b545dac56a890d8f3219bc18 (plain) (blame)
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
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
/******************************************************************************
 *
 * Module Name: nsinit - namespace initialization
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2010, Intel Corp.
 * 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 "accommon.h"
#include "acnamesp.h"
#include "acdispat.h"
#include "acinterp.h"
#include <linux/nmi.h>

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsinit")

/* Local prototypes */
static acpi_status
acpi_ns_init_one_object(acpi_handle obj_handle,
			u32 level, void *context, void **return_value);

static acpi_status
acpi_ns_init_one_device(acpi_handle obj_handle,
			u32 nesting_level, void *context, void **return_value);

static acpi_status
acpi_ns_find_ini_methods(acpi_handle obj_handle,
			 u32 nesting_level, void *context, void **return_value);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_initialize_objects
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk the entire namespace and perform any necessary
 *              initialization on the objects found therein
 *
 ******************************************************************************/

acpi_status acpi_ns_initialize_objects(void)
{
	acpi_status status;
	struct acpi_init_walk_info info;

	ACPI_FUNCTION_TRACE(ns_initialize_objects);

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "**** Starting initialization of namespace objects ****\n"));
	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
			      "Completing Region/Field/Buffer/Package initialization:"));

	/* Set all init info to zero */

	ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));

	/* Walk entire namespace from the supplied root */

	status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
				     ACPI_UINT32_MAX, acpi_ns_init_one_object, NULL,
				     &info, NULL);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
	}

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
			      "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd "
			      "Buffers %hd/%hd Packages (%hd nodes)\n",
			      info.op_region_init, info.op_region_count,
			      info.field_init, info.field_count,
			      info.buffer_init, info.buffer_count,
			      info.package_init, info.package_count,
			      info.object_count));

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "%hd Control Methods found\n", info.method_count));
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "%hd Op Regions found\n", info.op_region_count));

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_initialize_devices
 *
 * PARAMETERS:  None
 *
 * RETURN:      acpi_status
 *
 * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
 *              This means running _INI on all present devices.
 *
 *              Note: We install PCI config space handler on region access,
 *              not here.
 *
 ******************************************************************************/

acpi_status acpi_ns_initialize_devices(void)
{
	acpi_status status;
	struct acpi_device_walk_info info;

	ACPI_FUNCTION_TRACE(ns_initialize_devices);

	/* Init counters */

	info.device_count = 0;
	info.num_STA = 0;
	info.num_INI = 0;

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
			      "Initializing Device/Processor/Thermal objects "
			      "by executing _INI methods:"));

	/* Tree analysis: find all subtrees that contain _INI methods */

	status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
					ACPI_UINT32_MAX, FALSE,
					acpi_ns_find_ini_methods, NULL, &info,
					NULL);
	if (ACPI_FAILURE(status)) {
		goto error_exit;
	}

	/* Allocate the evaluation information block */

	info.evaluate_info =
	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
	if (!info.evaluate_info) {
		status = AE_NO_MEMORY;
		goto error_exit;
	}

	/*
	 * Execute the "global" _INI method that may appear at the root. This
	 * support is provided for Windows compatibility (Vista+) and is not
	 * part of the ACPI specification.
	 */
	info.evaluate_info->prefix_node = acpi_gbl_root_node;
	info.evaluate_info->pathname = METHOD_NAME__INI;
	info.evaluate_info->parameters = NULL;
	info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;

	status = acpi_ns_evaluate(info.evaluate_info);
	if (ACPI_SUCCESS(status)) {
		info.num_INI++;
	}

	/* Walk namespace to execute all _INIs on present devices */

	status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
					ACPI_UINT32_MAX, FALSE,
					acpi_ns_init_one_device, NULL, &info,
					NULL);

	ACPI_FREE(info.evaluate_info);
	if (ACPI_FAILURE(status)) {
		goto error_exit;
	}

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
			      "\nExecuted %hd _INI methods requiring %hd _STA executions "
			      "(examined %hd objects)\n",
			      info.num_INI, info.num_STA, info.device_count));

	return_ACPI_STATUS(status);

      error_exit:
	ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_init_one_object
 *
 * PARAMETERS:  obj_handle      - Node
 *              Level           - Current nesting level
 *              Context         - Points to a init info struct
 *              return_value    - Not used
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
 *              within the  namespace.
 *
 *              Currently, the only objects that require initialization are:
 *              1) Methods
 *              2) Op Regions
 *
 ******************************************************************************/

static acpi_status
acpi_ns_init_one_object(acpi_handle obj_handle,
			u32 level, void *context, void **return_value)
{
	acpi_object_type type;
	acpi_status status = AE_OK;
	struct acpi_init_walk_info *info =
	    (struct acpi_init_walk_info *)context;
	struct acpi_namespace_node *node =
	    (struct acpi_namespace_node *)obj_handle;
	union acpi_operand_object *obj_desc;

	ACPI_FUNCTION_NAME(ns_init_one_object);

	info->object_count++;

	/* And even then, we are only interested in a few object types */

	type = acpi_ns_get_type(obj_handle);
	obj_desc = acpi_ns_get_attached_object(node);
	if (!obj_desc) {
		return (AE_OK);
	}

	/* Increment counters for object types we are looking for */

	switch (type) {
	case ACPI_TYPE_REGION:
		info->op_region_count++;
		break;

	case ACPI_TYPE_BUFFER_FIELD:
		info->field_count++;
		break;

	case ACPI_TYPE_LOCAL_BANK_FIELD:
		info->field_count++;
		break;

	case ACPI_TYPE_BUFFER:
		info->buffer_count++;
		break;

	case ACPI_TYPE_PACKAGE:
		info->package_count++;
		break;

	default:

		/* No init required, just exit now */
		return (AE_OK);
	}

	/* If the object is already initialized, nothing else to do */

	if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
		return (AE_OK);
	}

	/* Must lock the interpreter before executing AML code */

	acpi_ex_enter_interpreter();

	/*
	 * Each of these types can contain executable AML code within the
	 * declaration.
	 */
	switch (type) {
	case ACPI_TYPE_REGION:

		info->op_region_init++;
		status = acpi_ds_get_region_arguments(obj_desc);
		break;

	case ACPI_TYPE_BUFFER_FIELD:

		info->field_init++;
		status = acpi_ds_get_buffer_field_arguments(obj_desc);
		break;

	case ACPI_TYPE_LOCAL_BANK_FIELD:

		info->field_init++;
		status = acpi_ds_get_bank_field_arguments(obj_desc);
		break;

	case ACPI_TYPE_BUFFER:

		info->buffer_init++;
		status = acpi_ds_get_buffer_arguments(obj_desc);
		break;

	case ACPI_TYPE_PACKAGE:

		info->package_init++;
		status = acpi_ds_get_package_arguments(obj_desc);
		break;

	default:
		/* No other types can get here */
		break;
	}

	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status,
				"Could not execute arguments for [%4.4s] (%s)",
				acpi_ut_get_node_name(node),
				acpi_ut_get_type_name(type)));
	}

	/*
	 * Print a dot for each object unless we are going to print the entire
	 * pathname
	 */
	if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
		ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
	}

	/*
	 * We ignore errors from above, and always return OK, since we don't want
	 * to abort the walk on any single error.
	 */
	acpi_ex_exit_interpreter();
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_find_ini_methods
 *
 * PARAMETERS:  acpi_walk_callback
 *
 * RETURN:      acpi_status
 *
 * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
 *              device/processor/thermal objects, and marks the entire subtree
 *              with a SUBTREE_HAS_INI flag. This flag is used during the
 *              subsequent device initialization walk to avoid entire subtrees
 *              that do not contain an _INI.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_find_ini_methods(acpi_handle obj_handle,
			 u32 nesting_level, void *context, void **return_value)
{
	struct acpi_device_walk_info *info =
	    ACPI_CAST_PTR(struct acpi_device_walk_info, context);
	struct acpi_namespace_node *node;
	struct acpi_namespace_node *parent_node;

	/* Keep count of device/processor/thermal objects */

	node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	if ((node->type == ACPI_TYPE_DEVICE) ||
	    (node->type == ACPI_TYPE_PROCESSOR) ||
	    (node->type == ACPI_TYPE_THERMAL)) {
		info->device_count++;
		return (AE_OK);
	}

	/* We are only looking for methods named _INI */

	if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
		return (AE_OK);
	}

	/*
	 * The only _INI methods that we care about are those that are
	 * present under Device, Processor, and Thermal objects.
	 */
	parent_node = acpi_ns_get_parent_node(node);
	switch (parent_node->type) {
	case ACPI_TYPE_DEVICE:
	case ACPI_TYPE_PROCESSOR:
	case ACPI_TYPE_THERMAL:

		/* Mark parent and bubble up the INI present flag to the root */

		while (parent_node) {
			parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
			parent_node = acpi_ns_get_parent_node(parent_node);
		}
		break;

	default:
		break;
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_init_one_device
 *
 * PARAMETERS:  acpi_walk_callback
 *
 * RETURN:      acpi_status
 *
 * DESCRIPTION: This is called once per device soon after ACPI is enabled
 *              to initialize each device. It determines if the device is
 *              present, and if so, calls _INI.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_init_one_device(acpi_handle obj_handle,
			u32 nesting_level, void *context, void **return_value)
{
	struct acpi_device_walk_info *walk_info =
	    ACPI_CAST_PTR(struct acpi_device_walk_info, context);
	struct acpi_evaluate_info *info = walk_info->evaluate_info;
	u32 flags;
	acpi_status status;
	struct acpi_namespace_node *device_node;

	ACPI_FUNCTION_TRACE(ns_init_one_device);

	/* We are interested in Devices, Processors and thermal_zones only */

	device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	if ((device_node->type != ACPI_TYPE_DEVICE) &&
	    (device_node->type != ACPI_TYPE_PROCESSOR) &&
	    (device_node->type != ACPI_TYPE_THERMAL)) {
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * Because of an earlier namespace analysis, all subtrees that contain an
	 * _INI method are tagged.
	 *
	 * If this device subtree does not contain any _INI methods, we
	 * can exit now and stop traversing this entire subtree.
	 */
	if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
		return_ACPI_STATUS(AE_CTRL_DEPTH);
	}

	/*
	 * Run _STA to determine if this device is present and functioning. We
	 * must know this information for two important reasons (from ACPI spec):
	 *
	 * 1) We can only run _INI if the device is present.
	 * 2) We must abort the device tree walk on this subtree if the device is
	 *    not present and is not functional (we will not examine the children)
	 *
	 * The _STA method is not required to be present under the device, we
	 * assume the device is present if _STA does not exist.
	 */
	ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
			(ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));

	status = acpi_ut_execute_STA(device_node, &flags);
	if (ACPI_FAILURE(status)) {

		/* Ignore error and move on to next device */

		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * Flags == -1 means that _STA was not found. In this case, we assume that
	 * the device is both present and functional.
	 *
	 * From the ACPI spec, description of _STA:
	 *
	 * "If a device object (including the processor object) does not have an
	 * _STA object, then OSPM assumes that all of the above bits are set (in
	 * other words, the device is present, ..., and functioning)"
	 */
	if (flags != ACPI_UINT32_MAX) {
		walk_info->num_STA++;
	}

	/*
	 * Examine the PRESENT and FUNCTIONING status bits
	 *
	 * Note: ACPI spec does not seem to specify behavior for the present but
	 * not functioning case, so we assume functioning if present.
	 */
	if (!(flags & ACPI_STA_DEVICE_PRESENT)) {

		/* Device is not present, we must examine the Functioning bit */

		if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
			/*
			 * Device is not present but is "functioning". In this case,
			 * we will not run _INI, but we continue to examine the children
			 * of this device.
			 *
			 * From the ACPI spec, description of _STA: (Note - no mention
			 * of whether to run _INI or not on the device in question)
			 *
			 * "_STA may return bit 0 clear (not present) with bit 3 set
			 * (device is functional). This case is used to indicate a valid
			 * device for which no device driver should be loaded (for example,
			 * a bridge device.) Children of this device may be present and
			 * valid. OSPM should continue enumeration below a device whose
			 * _STA returns this bit combination"
			 */
			return_ACPI_STATUS(AE_OK);
		} else {
			/*
			 * Device is not present and is not functioning. We must abort the
			 * walk of this subtree immediately -- don't look at the children
			 * of such a device.
			 *
			 * From the ACPI spec, description of _INI:
			 *
			 * "If the _STA method indicates that the device is not present,
			 * OSPM will not run the _INI and will not examine the children
			 * of the device for _INI methods"
			 */
			return_ACPI_STATUS(AE_CTRL_DEPTH);
		}
	}

	/*
	 * The device is present or is assumed present if no _STA exists.
	 * Run the _INI if it exists (not required to exist)
	 *
	 * Note: We know there is an _INI within this subtree, but it may not be
	 * under this particular device, it may be lower in the branch.
	 */
	ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
			(ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));

	info->prefix_node = device_node;
	info->pathname = METHOD_NAME__INI;
	info->parameters = NULL;
	info->flags = ACPI_IGNORE_RETURN_VALUE;

	/*
	 * Some hardware relies on this being executed as atomically
	 * as possible (without an NMI being received in the middle of
	 * this) - so disable NMIs and initialize the device:
	 */
	acpi_nmi_disable();
	status = acpi_ns_evaluate(info);
	acpi_nmi_enable();

	if (ACPI_SUCCESS(status)) {
		walk_info->num_INI++;

		if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
		    (!(acpi_dbg_level & ACPI_LV_INFO))) {
			ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
		}
	}
#ifdef ACPI_DEBUG_OUTPUT
	else if (status != AE_NOT_FOUND) {

		/* Ignore error and move on to next device */

		char *scope_name =
		    acpi_ns_get_external_pathname(info->resolved_node);

		ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
				scope_name));
		ACPI_FREE(scope_name);
	}
#endif

	/* Ignore errors from above */

	status = AE_OK;

	/*
	 * The _INI method has been run if present; call the Global Initialization
	 * Handler for this device.
	 */
	if (acpi_gbl_init_handler) {
		status =
		    acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
	}

	return_ACPI_STATUS(status);
}