1 /******************************************************************************
3 * Module Name: nsinit - namespace initialization
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2011, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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
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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.
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.
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44 #include <acpi/acpi.h>
49 #include <linux/nmi.h>
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nsinit")
54 /* Local prototypes */
56 acpi_ns_init_one_object(acpi_handle obj_handle,
57 u32 level, void *context, void **return_value);
60 acpi_ns_init_one_device(acpi_handle obj_handle,
61 u32 nesting_level, void *context, void **return_value);
64 acpi_ns_find_ini_methods(acpi_handle obj_handle,
65 u32 nesting_level, void *context, void **return_value);
67 /*******************************************************************************
69 * FUNCTION: acpi_ns_initialize_objects
75 * DESCRIPTION: Walk the entire namespace and perform any necessary
76 * initialization on the objects found therein
78 ******************************************************************************/
80 acpi_status acpi_ns_initialize_objects(void)
83 struct acpi_init_walk_info info;
85 ACPI_FUNCTION_TRACE(ns_initialize_objects);
87 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
88 "**** Starting initialization of namespace objects ****\n"));
89 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
90 "Completing Region/Field/Buffer/Package initialization:"));
92 /* Set all init info to zero */
94 ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
96 /* Walk entire namespace from the supplied root */
98 status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
99 ACPI_UINT32_MAX, acpi_ns_init_one_object, NULL,
101 if (ACPI_FAILURE(status)) {
102 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
105 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
106 "\nInitialized %u/%u Regions %u/%u Fields %u/%u "
107 "Buffers %u/%u Packages (%u nodes)\n",
108 info.op_region_init, info.op_region_count,
109 info.field_init, info.field_count,
110 info.buffer_init, info.buffer_count,
111 info.package_init, info.package_count,
114 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
115 "%u Control Methods found\n", info.method_count));
116 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
117 "%u Op Regions found\n", info.op_region_count));
119 return_ACPI_STATUS(AE_OK);
122 /*******************************************************************************
124 * FUNCTION: acpi_ns_initialize_devices
128 * RETURN: acpi_status
130 * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
131 * This means running _INI on all present devices.
133 * Note: We install PCI config space handler on region access,
136 ******************************************************************************/
138 acpi_status acpi_ns_initialize_devices(void)
141 struct acpi_device_walk_info info;
143 ACPI_FUNCTION_TRACE(ns_initialize_devices);
147 info.device_count = 0;
151 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
152 "Initializing Device/Processor/Thermal objects "
153 "by executing _INI methods:"));
155 /* Tree analysis: find all subtrees that contain _INI methods */
157 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
158 ACPI_UINT32_MAX, FALSE,
159 acpi_ns_find_ini_methods, NULL, &info,
161 if (ACPI_FAILURE(status)) {
165 /* Allocate the evaluation information block */
168 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
169 if (!info.evaluate_info) {
170 status = AE_NO_MEMORY;
175 * Execute the "global" _INI method that may appear at the root. This
176 * support is provided for Windows compatibility (Vista+) and is not
177 * part of the ACPI specification.
179 info.evaluate_info->prefix_node = acpi_gbl_root_node;
180 info.evaluate_info->pathname = METHOD_NAME__INI;
181 info.evaluate_info->parameters = NULL;
182 info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;
184 status = acpi_ns_evaluate(info.evaluate_info);
185 if (ACPI_SUCCESS(status)) {
189 /* Walk namespace to execute all _INIs on present devices */
191 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
192 ACPI_UINT32_MAX, FALSE,
193 acpi_ns_init_one_device, NULL, &info,
197 * Any _OSI requests should be completed by now. If the BIOS has
198 * requested any Windows OSI strings, we will always truncate
199 * I/O addresses to 16 bits -- for Windows compatibility.
201 if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) {
202 acpi_gbl_truncate_io_addresses = TRUE;
205 ACPI_FREE(info.evaluate_info);
206 if (ACPI_FAILURE(status)) {
210 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
211 "\nExecuted %u _INI methods requiring %u _STA executions "
212 "(examined %u objects)\n",
213 info.num_INI, info.num_STA, info.device_count));
215 return_ACPI_STATUS(status);
218 ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
219 return_ACPI_STATUS(status);
222 /*******************************************************************************
224 * FUNCTION: acpi_ns_init_one_object
226 * PARAMETERS: obj_handle - Node
227 * Level - Current nesting level
228 * Context - Points to a init info struct
229 * return_value - Not used
233 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
234 * within the namespace.
236 * Currently, the only objects that require initialization are:
240 ******************************************************************************/
243 acpi_ns_init_one_object(acpi_handle obj_handle,
244 u32 level, void *context, void **return_value)
246 acpi_object_type type;
247 acpi_status status = AE_OK;
248 struct acpi_init_walk_info *info =
249 (struct acpi_init_walk_info *)context;
250 struct acpi_namespace_node *node =
251 (struct acpi_namespace_node *)obj_handle;
252 union acpi_operand_object *obj_desc;
254 ACPI_FUNCTION_NAME(ns_init_one_object);
256 info->object_count++;
258 /* And even then, we are only interested in a few object types */
260 type = acpi_ns_get_type(obj_handle);
261 obj_desc = acpi_ns_get_attached_object(node);
266 /* Increment counters for object types we are looking for */
269 case ACPI_TYPE_REGION:
270 info->op_region_count++;
273 case ACPI_TYPE_BUFFER_FIELD:
277 case ACPI_TYPE_LOCAL_BANK_FIELD:
281 case ACPI_TYPE_BUFFER:
282 info->buffer_count++;
285 case ACPI_TYPE_PACKAGE:
286 info->package_count++;
291 /* No init required, just exit now */
295 /* If the object is already initialized, nothing else to do */
297 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
301 /* Must lock the interpreter before executing AML code */
303 acpi_ex_enter_interpreter();
306 * Each of these types can contain executable AML code within the
310 case ACPI_TYPE_REGION:
312 info->op_region_init++;
313 status = acpi_ds_get_region_arguments(obj_desc);
316 case ACPI_TYPE_BUFFER_FIELD:
319 status = acpi_ds_get_buffer_field_arguments(obj_desc);
322 case ACPI_TYPE_LOCAL_BANK_FIELD:
325 status = acpi_ds_get_bank_field_arguments(obj_desc);
328 case ACPI_TYPE_BUFFER:
331 status = acpi_ds_get_buffer_arguments(obj_desc);
334 case ACPI_TYPE_PACKAGE:
336 info->package_init++;
337 status = acpi_ds_get_package_arguments(obj_desc);
341 /* No other types can get here */
345 if (ACPI_FAILURE(status)) {
346 ACPI_EXCEPTION((AE_INFO, status,
347 "Could not execute arguments for [%4.4s] (%s)",
348 acpi_ut_get_node_name(node),
349 acpi_ut_get_type_name(type)));
353 * Print a dot for each object unless we are going to print the entire
356 if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
357 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
361 * We ignore errors from above, and always return OK, since we don't want
362 * to abort the walk on any single error.
364 acpi_ex_exit_interpreter();
368 /*******************************************************************************
370 * FUNCTION: acpi_ns_find_ini_methods
372 * PARAMETERS: acpi_walk_callback
374 * RETURN: acpi_status
376 * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
377 * device/processor/thermal objects, and marks the entire subtree
378 * with a SUBTREE_HAS_INI flag. This flag is used during the
379 * subsequent device initialization walk to avoid entire subtrees
380 * that do not contain an _INI.
382 ******************************************************************************/
385 acpi_ns_find_ini_methods(acpi_handle obj_handle,
386 u32 nesting_level, void *context, void **return_value)
388 struct acpi_device_walk_info *info =
389 ACPI_CAST_PTR(struct acpi_device_walk_info, context);
390 struct acpi_namespace_node *node;
391 struct acpi_namespace_node *parent_node;
393 /* Keep count of device/processor/thermal objects */
395 node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
396 if ((node->type == ACPI_TYPE_DEVICE) ||
397 (node->type == ACPI_TYPE_PROCESSOR) ||
398 (node->type == ACPI_TYPE_THERMAL)) {
399 info->device_count++;
403 /* We are only looking for methods named _INI */
405 if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
410 * The only _INI methods that we care about are those that are
411 * present under Device, Processor, and Thermal objects.
413 parent_node = node->parent;
414 switch (parent_node->type) {
415 case ACPI_TYPE_DEVICE:
416 case ACPI_TYPE_PROCESSOR:
417 case ACPI_TYPE_THERMAL:
419 /* Mark parent and bubble up the INI present flag to the root */
421 while (parent_node) {
422 parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
423 parent_node = parent_node->parent;
434 /*******************************************************************************
436 * FUNCTION: acpi_ns_init_one_device
438 * PARAMETERS: acpi_walk_callback
440 * RETURN: acpi_status
442 * DESCRIPTION: This is called once per device soon after ACPI is enabled
443 * to initialize each device. It determines if the device is
444 * present, and if so, calls _INI.
446 ******************************************************************************/
449 acpi_ns_init_one_device(acpi_handle obj_handle,
450 u32 nesting_level, void *context, void **return_value)
452 struct acpi_device_walk_info *walk_info =
453 ACPI_CAST_PTR(struct acpi_device_walk_info, context);
454 struct acpi_evaluate_info *info = walk_info->evaluate_info;
457 struct acpi_namespace_node *device_node;
459 ACPI_FUNCTION_TRACE(ns_init_one_device);
461 /* We are interested in Devices, Processors and thermal_zones only */
463 device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
464 if ((device_node->type != ACPI_TYPE_DEVICE) &&
465 (device_node->type != ACPI_TYPE_PROCESSOR) &&
466 (device_node->type != ACPI_TYPE_THERMAL)) {
467 return_ACPI_STATUS(AE_OK);
471 * Because of an earlier namespace analysis, all subtrees that contain an
472 * _INI method are tagged.
474 * If this device subtree does not contain any _INI methods, we
475 * can exit now and stop traversing this entire subtree.
477 if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
478 return_ACPI_STATUS(AE_CTRL_DEPTH);
482 * Run _STA to determine if this device is present and functioning. We
483 * must know this information for two important reasons (from ACPI spec):
485 * 1) We can only run _INI if the device is present.
486 * 2) We must abort the device tree walk on this subtree if the device is
487 * not present and is not functional (we will not examine the children)
489 * The _STA method is not required to be present under the device, we
490 * assume the device is present if _STA does not exist.
492 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
493 (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
495 status = acpi_ut_execute_STA(device_node, &flags);
496 if (ACPI_FAILURE(status)) {
498 /* Ignore error and move on to next device */
500 return_ACPI_STATUS(AE_OK);
504 * Flags == -1 means that _STA was not found. In this case, we assume that
505 * the device is both present and functional.
507 * From the ACPI spec, description of _STA:
509 * "If a device object (including the processor object) does not have an
510 * _STA object, then OSPM assumes that all of the above bits are set (in
511 * other words, the device is present, ..., and functioning)"
513 if (flags != ACPI_UINT32_MAX) {
514 walk_info->num_STA++;
518 * Examine the PRESENT and FUNCTIONING status bits
520 * Note: ACPI spec does not seem to specify behavior for the present but
521 * not functioning case, so we assume functioning if present.
523 if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
525 /* Device is not present, we must examine the Functioning bit */
527 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
529 * Device is not present but is "functioning". In this case,
530 * we will not run _INI, but we continue to examine the children
533 * From the ACPI spec, description of _STA: (Note - no mention
534 * of whether to run _INI or not on the device in question)
536 * "_STA may return bit 0 clear (not present) with bit 3 set
537 * (device is functional). This case is used to indicate a valid
538 * device for which no device driver should be loaded (for example,
539 * a bridge device.) Children of this device may be present and
540 * valid. OSPM should continue enumeration below a device whose
541 * _STA returns this bit combination"
543 return_ACPI_STATUS(AE_OK);
546 * Device is not present and is not functioning. We must abort the
547 * walk of this subtree immediately -- don't look at the children
550 * From the ACPI spec, description of _INI:
552 * "If the _STA method indicates that the device is not present,
553 * OSPM will not run the _INI and will not examine the children
554 * of the device for _INI methods"
556 return_ACPI_STATUS(AE_CTRL_DEPTH);
561 * The device is present or is assumed present if no _STA exists.
562 * Run the _INI if it exists (not required to exist)
564 * Note: We know there is an _INI within this subtree, but it may not be
565 * under this particular device, it may be lower in the branch.
567 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
568 (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
570 info->prefix_node = device_node;
571 info->pathname = METHOD_NAME__INI;
572 info->parameters = NULL;
573 info->flags = ACPI_IGNORE_RETURN_VALUE;
576 * Some hardware relies on this being executed as atomically
577 * as possible (without an NMI being received in the middle of
578 * this) - so disable NMIs and initialize the device:
580 status = acpi_ns_evaluate(info);
582 if (ACPI_SUCCESS(status)) {
583 walk_info->num_INI++;
585 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
586 (!(acpi_dbg_level & ACPI_LV_INFO))) {
587 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
590 #ifdef ACPI_DEBUG_OUTPUT
591 else if (status != AE_NOT_FOUND) {
593 /* Ignore error and move on to next device */
596 acpi_ns_get_external_pathname(info->resolved_node);
598 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
600 ACPI_FREE(scope_name);
604 /* Ignore errors from above */
609 * The _INI method has been run if present; call the Global Initialization
610 * Handler for this device.
612 if (acpi_gbl_init_handler) {
614 acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
617 return_ACPI_STATUS(status);