1 /******************************************************************************
3 * Module Name: nsinit - namespace initialization
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, 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
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.
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.
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.
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
,
101 if (ACPI_FAILURE(status
)) {
102 ACPI_EXCEPTION((AE_INFO
, status
, "During WalkNamespace"));
105 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT
,
106 "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd nodes)\n",
107 info
.op_region_init
, info
.op_region_count
,
108 info
.field_init
, info
.field_count
,
109 info
.buffer_init
, info
.buffer_count
,
110 info
.package_init
, info
.package_count
,
113 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH
,
114 "%hd Control Methods found\n", info
.method_count
));
115 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH
,
116 "%hd Op Regions found\n", info
.op_region_count
));
118 return_ACPI_STATUS(AE_OK
);
121 /*******************************************************************************
123 * FUNCTION: acpi_ns_initialize_devices
127 * RETURN: acpi_status
129 * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
130 * This means running _INI on all present devices.
132 * Note: We install PCI config space handler on region access,
135 ******************************************************************************/
137 acpi_status
acpi_ns_initialize_devices(void)
140 struct acpi_device_walk_info info
;
142 ACPI_FUNCTION_TRACE(ns_initialize_devices
);
146 info
.device_count
= 0;
150 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT
,
151 "Initializing Device/Processor/Thermal objects by executing _INI methods:"));
153 /* Tree analysis: find all subtrees that contain _INI methods */
155 status
= acpi_ns_walk_namespace(ACPI_TYPE_ANY
, ACPI_ROOT_OBJECT
,
156 ACPI_UINT32_MAX
, FALSE
,
157 acpi_ns_find_ini_methods
, &info
, NULL
);
158 if (ACPI_FAILURE(status
)) {
162 /* Allocate the evaluation information block */
165 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info
));
166 if (!info
.evaluate_info
) {
167 status
= AE_NO_MEMORY
;
171 /* Walk namespace to execute all _INIs on present devices */
173 status
= acpi_ns_walk_namespace(ACPI_TYPE_ANY
, ACPI_ROOT_OBJECT
,
174 ACPI_UINT32_MAX
, FALSE
,
175 acpi_ns_init_one_device
, &info
, NULL
);
177 ACPI_FREE(info
.evaluate_info
);
178 if (ACPI_FAILURE(status
)) {
182 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT
,
183 "\nExecuted %hd _INI methods requiring %hd _STA executions (examined %hd objects)\n",
184 info
.num_INI
, info
.num_STA
, info
.device_count
));
186 return_ACPI_STATUS(status
);
189 ACPI_EXCEPTION((AE_INFO
, status
, "During device initialization"));
190 return_ACPI_STATUS(status
);
193 /*******************************************************************************
195 * FUNCTION: acpi_ns_init_one_object
197 * PARAMETERS: obj_handle - Node
198 * Level - Current nesting level
199 * Context - Points to a init info struct
200 * return_value - Not used
204 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
205 * within the namespace.
207 * Currently, the only objects that require initialization are:
211 ******************************************************************************/
214 acpi_ns_init_one_object(acpi_handle obj_handle
,
215 u32 level
, void *context
, void **return_value
)
217 acpi_object_type type
;
218 acpi_status status
= AE_OK
;
219 struct acpi_init_walk_info
*info
=
220 (struct acpi_init_walk_info
*)context
;
221 struct acpi_namespace_node
*node
=
222 (struct acpi_namespace_node
*)obj_handle
;
223 union acpi_operand_object
*obj_desc
;
225 ACPI_FUNCTION_NAME(ns_init_one_object
);
227 info
->object_count
++;
229 /* And even then, we are only interested in a few object types */
231 type
= acpi_ns_get_type(obj_handle
);
232 obj_desc
= acpi_ns_get_attached_object(node
);
237 /* Increment counters for object types we are looking for */
240 case ACPI_TYPE_REGION
:
241 info
->op_region_count
++;
244 case ACPI_TYPE_BUFFER_FIELD
:
248 case ACPI_TYPE_LOCAL_BANK_FIELD
:
252 case ACPI_TYPE_BUFFER
:
253 info
->buffer_count
++;
256 case ACPI_TYPE_PACKAGE
:
257 info
->package_count
++;
262 /* No init required, just exit now */
267 * If the object is already initialized, nothing else to do
269 if (obj_desc
->common
.flags
& AOPOBJ_DATA_VALID
) {
274 * Must lock the interpreter before executing AML code
276 acpi_ex_enter_interpreter();
279 * Each of these types can contain executable AML code within the
283 case ACPI_TYPE_REGION
:
285 info
->op_region_init
++;
286 status
= acpi_ds_get_region_arguments(obj_desc
);
289 case ACPI_TYPE_BUFFER_FIELD
:
292 status
= acpi_ds_get_buffer_field_arguments(obj_desc
);
295 case ACPI_TYPE_LOCAL_BANK_FIELD
:
298 status
= acpi_ds_get_bank_field_arguments(obj_desc
);
301 case ACPI_TYPE_BUFFER
:
304 status
= acpi_ds_get_buffer_arguments(obj_desc
);
307 case ACPI_TYPE_PACKAGE
:
309 info
->package_init
++;
310 status
= acpi_ds_get_package_arguments(obj_desc
);
314 /* No other types can get here */
318 if (ACPI_FAILURE(status
)) {
319 ACPI_EXCEPTION((AE_INFO
, status
,
320 "Could not execute arguments for [%4.4s] (%s)",
321 acpi_ut_get_node_name(node
),
322 acpi_ut_get_type_name(type
)));
326 * Print a dot for each object unless we are going to print the entire
329 if (!(acpi_dbg_level
& ACPI_LV_INIT_NAMES
)) {
330 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT
, "."));
334 * We ignore errors from above, and always return OK, since we don't want
335 * to abort the walk on any single error.
337 acpi_ex_exit_interpreter();
341 /*******************************************************************************
343 * FUNCTION: acpi_ns_find_ini_methods
345 * PARAMETERS: acpi_walk_callback
347 * RETURN: acpi_status
349 * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
350 * device/processor/thermal objects, and marks the entire subtree
351 * with a SUBTREE_HAS_INI flag. This flag is used during the
352 * subsequent device initialization walk to avoid entire subtrees
353 * that do not contain an _INI.
355 ******************************************************************************/
358 acpi_ns_find_ini_methods(acpi_handle obj_handle
,
359 u32 nesting_level
, void *context
, void **return_value
)
361 struct acpi_device_walk_info
*info
=
362 ACPI_CAST_PTR(struct acpi_device_walk_info
, context
);
363 struct acpi_namespace_node
*node
;
364 struct acpi_namespace_node
*parent_node
;
366 /* Keep count of device/processor/thermal objects */
368 node
= ACPI_CAST_PTR(struct acpi_namespace_node
, obj_handle
);
369 if ((node
->type
== ACPI_TYPE_DEVICE
) ||
370 (node
->type
== ACPI_TYPE_PROCESSOR
) ||
371 (node
->type
== ACPI_TYPE_THERMAL
)) {
372 info
->device_count
++;
376 /* We are only looking for methods named _INI */
378 if (!ACPI_COMPARE_NAME(node
->name
.ascii
, METHOD_NAME__INI
)) {
383 * The only _INI methods that we care about are those that are
384 * present under Device, Processor, and Thermal objects.
386 parent_node
= acpi_ns_get_parent_node(node
);
387 switch (parent_node
->type
) {
388 case ACPI_TYPE_DEVICE
:
389 case ACPI_TYPE_PROCESSOR
:
390 case ACPI_TYPE_THERMAL
:
392 /* Mark parent and bubble up the INI present flag to the root */
394 while (parent_node
) {
395 parent_node
->flags
|= ANOBJ_SUBTREE_HAS_INI
;
396 parent_node
= acpi_ns_get_parent_node(parent_node
);
407 /*******************************************************************************
409 * FUNCTION: acpi_ns_init_one_device
411 * PARAMETERS: acpi_walk_callback
413 * RETURN: acpi_status
415 * DESCRIPTION: This is called once per device soon after ACPI is enabled
416 * to initialize each device. It determines if the device is
417 * present, and if so, calls _INI.
419 ******************************************************************************/
422 acpi_ns_init_one_device(acpi_handle obj_handle
,
423 u32 nesting_level
, void *context
, void **return_value
)
425 struct acpi_device_walk_info
*walk_info
=
426 ACPI_CAST_PTR(struct acpi_device_walk_info
, context
);
427 struct acpi_evaluate_info
*info
= walk_info
->evaluate_info
;
430 struct acpi_namespace_node
*device_node
;
432 ACPI_FUNCTION_TRACE(ns_init_one_device
);
434 /* We are interested in Devices, Processors and thermal_zones only */
436 device_node
= ACPI_CAST_PTR(struct acpi_namespace_node
, obj_handle
);
437 if ((device_node
->type
!= ACPI_TYPE_DEVICE
) &&
438 (device_node
->type
!= ACPI_TYPE_PROCESSOR
) &&
439 (device_node
->type
!= ACPI_TYPE_THERMAL
)) {
440 return_ACPI_STATUS(AE_OK
);
444 * Because of an earlier namespace analysis, all subtrees that contain an
445 * _INI method are tagged.
447 * If this device subtree does not contain any _INI methods, we
448 * can exit now and stop traversing this entire subtree.
450 if (!(device_node
->flags
& ANOBJ_SUBTREE_HAS_INI
)) {
451 return_ACPI_STATUS(AE_CTRL_DEPTH
);
455 * Run _STA to determine if this device is present and functioning. We
456 * must know this information for two important reasons (from ACPI spec):
458 * 1) We can only run _INI if the device is present.
459 * 2) We must abort the device tree walk on this subtree if the device is
460 * not present and is not functional (we will not examine the children)
462 * The _STA method is not required to be present under the device, we
463 * assume the device is present if _STA does not exist.
465 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
466 (ACPI_TYPE_METHOD
, device_node
, METHOD_NAME__STA
));
468 status
= acpi_ut_execute_STA(device_node
, &flags
);
469 if (ACPI_FAILURE(status
)) {
471 /* Ignore error and move on to next device */
473 return_ACPI_STATUS(AE_OK
);
477 * Flags == -1 means that _STA was not found. In this case, we assume that
478 * the device is both present and functional.
480 * From the ACPI spec, description of _STA:
482 * "If a device object (including the processor object) does not have an
483 * _STA object, then OSPM assumes that all of the above bits are set (in
484 * other words, the device is present, ..., and functioning)"
486 if (flags
!= ACPI_UINT32_MAX
) {
487 walk_info
->num_STA
++;
491 * Examine the PRESENT and FUNCTIONING status bits
493 * Note: ACPI spec does not seem to specify behavior for the present but
494 * not functioning case, so we assume functioning if present.
496 if (!(flags
& ACPI_STA_DEVICE_PRESENT
)) {
498 /* Device is not present, we must examine the Functioning bit */
500 if (flags
& ACPI_STA_DEVICE_FUNCTIONING
) {
502 * Device is not present but is "functioning". In this case,
503 * we will not run _INI, but we continue to examine the children
506 * From the ACPI spec, description of _STA: (Note - no mention
507 * of whether to run _INI or not on the device in question)
509 * "_STA may return bit 0 clear (not present) with bit 3 set
510 * (device is functional). This case is used to indicate a valid
511 * device for which no device driver should be loaded (for example,
512 * a bridge device.) Children of this device may be present and
513 * valid. OSPM should continue enumeration below a device whose
514 * _STA returns this bit combination"
516 return_ACPI_STATUS(AE_OK
);
519 * Device is not present and is not functioning. We must abort the
520 * walk of this subtree immediately -- don't look at the children
523 * From the ACPI spec, description of _INI:
525 * "If the _STA method indicates that the device is not present,
526 * OSPM will not run the _INI and will not examine the children
527 * of the device for _INI methods"
529 return_ACPI_STATUS(AE_CTRL_DEPTH
);
534 * The device is present or is assumed present if no _STA exists.
535 * Run the _INI if it exists (not required to exist)
537 * Note: We know there is an _INI within this subtree, but it may not be
538 * under this particular device, it may be lower in the branch.
540 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
541 (ACPI_TYPE_METHOD
, device_node
, METHOD_NAME__INI
));
543 info
->prefix_node
= device_node
;
544 info
->pathname
= METHOD_NAME__INI
;
545 info
->parameters
= NULL
;
546 info
->flags
= ACPI_IGNORE_RETURN_VALUE
;
549 * Some hardware relies on this being executed as atomically
550 * as possible (without an NMI being received in the middle of
551 * this) - so disable NMIs and initialize the device:
554 status
= acpi_ns_evaluate(info
);
557 if (ACPI_SUCCESS(status
)) {
558 walk_info
->num_INI
++;
560 if ((acpi_dbg_level
<= ACPI_LV_ALL_EXCEPTIONS
) &&
561 (!(acpi_dbg_level
& ACPI_LV_INFO
))) {
562 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT
, "."));
565 #ifdef ACPI_DEBUG_OUTPUT
566 else if (status
!= AE_NOT_FOUND
) {
568 /* Ignore error and move on to next device */
571 acpi_ns_get_external_pathname(info
->resolved_node
);
573 ACPI_EXCEPTION((AE_INFO
, status
, "during %s._INI execution",
575 ACPI_FREE(scope_name
);
579 /* Ignore errors from above */
584 * The _INI method has been run if present; call the Global Initialization
585 * Handler for this device.
587 if (acpi_gbl_init_handler
) {
589 acpi_gbl_init_handler(device_node
, ACPI_INIT_DEVICE_INI
);
592 return_ACPI_STATUS(status
);