blob: 33db2241044e5930430c5091f6580c9013721f15 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/******************************************************************************
2 *
3 * Module Name: nsinit - namespace initialization
4 *
5 *****************************************************************************/
6
7/*
Bob Moore6c9deb72007-02-02 19:48:24 +03008 * Copyright (C) 2000 - 2007, R. Byron Moore
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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.
25 *
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.
29 *
30 * NO WARRANTY
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.
42 */
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <acpi/acpi.h>
45#include <acpi/acnamesp.h>
46#include <acpi/acdispat.h>
47#include <acpi/acinterp.h>
Ingo Molnar5d0e6002007-02-13 13:26:24 +010048#include <linux/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50#define _COMPONENT ACPI_NAMESPACE
Len Brown4be44fc2005-08-05 00:44:28 -040051ACPI_MODULE_NAME("nsinit")
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Robert Moore44f6c012005-04-18 22:49:35 -040053/* Local prototypes */
Len Brown4be44fc2005-08-05 00:44:28 -040054static acpi_status
55acpi_ns_init_one_object(acpi_handle obj_handle,
56 u32 level, void *context, void **return_value);
Robert Moore44f6c012005-04-18 22:49:35 -040057
58static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040059acpi_ns_init_one_device(acpi_handle obj_handle,
60 u32 nesting_level, void *context, void **return_value);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Bob Mooreb229cf92006-04-21 17:15:00 -040062static acpi_status
63acpi_ns_find_ini_methods(acpi_handle obj_handle,
64 u32 nesting_level, void *context, void **return_value);
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066/*******************************************************************************
67 *
68 * FUNCTION: acpi_ns_initialize_objects
69 *
70 * PARAMETERS: None
71 *
72 * RETURN: Status
73 *
74 * DESCRIPTION: Walk the entire namespace and perform any necessary
75 * initialization on the objects found therein
76 *
77 ******************************************************************************/
78
Len Brown4be44fc2005-08-05 00:44:28 -040079acpi_status acpi_ns_initialize_objects(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
Len Brown4be44fc2005-08-05 00:44:28 -040081 acpi_status status;
82 struct acpi_init_walk_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Bob Mooreb229cf92006-04-21 17:15:00 -040084 ACPI_FUNCTION_TRACE(ns_initialize_objects);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Len Brown4be44fc2005-08-05 00:44:28 -040086 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
87 "**** Starting initialization of namespace objects ****\n"));
88 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
89 "Completing Region/Field/Buffer/Package initialization:"));
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 /* Set all init info to zero */
92
Len Brown4be44fc2005-08-05 00:44:28 -040093 ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95 /* Walk entire namespace from the supplied root */
96
Len Brown4be44fc2005-08-05 00:44:28 -040097 status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
98 ACPI_UINT32_MAX, acpi_ns_init_one_object,
99 &info, NULL);
100 if (ACPI_FAILURE(status)) {
Bob Mooreb229cf92006-04-21 17:15:00 -0400101 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 }
103
Len Brown4be44fc2005-08-05 00:44:28 -0400104 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
105 "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd nodes)\n",
106 info.op_region_init, info.op_region_count,
107 info.field_init, info.field_count,
108 info.buffer_init, info.buffer_count,
109 info.package_init, info.package_count,
110 info.object_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Len Brown4be44fc2005-08-05 00:44:28 -0400112 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
113 "%hd Control Methods found\n", info.method_count));
114 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
115 "%hd Op Regions found\n", info.op_region_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Len Brown4be44fc2005-08-05 00:44:28 -0400117 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118}
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120/*******************************************************************************
121 *
122 * FUNCTION: acpi_ns_initialize_devices
123 *
124 * PARAMETERS: None
125 *
126 * RETURN: acpi_status
127 *
128 * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
129 * This means running _INI on all present devices.
130 *
131 * Note: We install PCI config space handler on region access,
132 * not here.
133 *
134 ******************************************************************************/
135
Len Brown4be44fc2005-08-05 00:44:28 -0400136acpi_status acpi_ns_initialize_devices(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
Len Brown4be44fc2005-08-05 00:44:28 -0400138 acpi_status status;
139 struct acpi_device_walk_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Bob Mooreb229cf92006-04-21 17:15:00 -0400141 ACPI_FUNCTION_TRACE(ns_initialize_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 /* Init counters */
144
145 info.device_count = 0;
146 info.num_STA = 0;
147 info.num_INI = 0;
148
Len Brown4be44fc2005-08-05 00:44:28 -0400149 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
Bob Mooreb229cf92006-04-21 17:15:00 -0400150 "Initializing Device/Processor/Thermal objects by executing _INI methods:"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Bob Mooreb229cf92006-04-21 17:15:00 -0400152 /* Tree analysis: find all subtrees that contain _INI methods */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Len Brown4be44fc2005-08-05 00:44:28 -0400154 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
Bob Mooreb229cf92006-04-21 17:15:00 -0400155 ACPI_UINT32_MAX, FALSE,
156 acpi_ns_find_ini_methods, &info, NULL);
Len Brown4be44fc2005-08-05 00:44:28 -0400157 if (ACPI_FAILURE(status)) {
Bob Moore41195322006-05-26 16:36:00 -0400158 goto error_exit;
159 }
160
161 /* Allocate the evaluation information block */
162
163 info.evaluate_info =
164 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
165 if (!info.evaluate_info) {
166 status = AE_NO_MEMORY;
167 goto error_exit;
Bob Mooreb229cf92006-04-21 17:15:00 -0400168 }
169
170 /* Walk namespace to execute all _INIs on present devices */
171
172 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
173 ACPI_UINT32_MAX, FALSE,
174 acpi_ns_init_one_device, &info, NULL);
Bob Moore41195322006-05-26 16:36:00 -0400175
176 ACPI_FREE(info.evaluate_info);
Bob Mooreb229cf92006-04-21 17:15:00 -0400177 if (ACPI_FAILURE(status)) {
Bob Moore41195322006-05-26 16:36:00 -0400178 goto error_exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180
Len Brown4be44fc2005-08-05 00:44:28 -0400181 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
Bob Mooreb229cf92006-04-21 17:15:00 -0400182 "\nExecuted %hd _INI methods requiring %hd _STA executions (examined %hd objects)\n",
183 info.num_INI, info.num_STA, info.device_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Len Brown4be44fc2005-08-05 00:44:28 -0400185 return_ACPI_STATUS(status);
Bob Moore41195322006-05-26 16:36:00 -0400186
187 error_exit:
188 ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
189 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192/*******************************************************************************
193 *
194 * FUNCTION: acpi_ns_init_one_object
195 *
196 * PARAMETERS: obj_handle - Node
197 * Level - Current nesting level
198 * Context - Points to a init info struct
199 * return_value - Not used
200 *
201 * RETURN: Status
202 *
203 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
204 * within the namespace.
205 *
206 * Currently, the only objects that require initialization are:
207 * 1) Methods
208 * 2) Op Regions
209 *
210 ******************************************************************************/
211
Robert Moore44f6c012005-04-18 22:49:35 -0400212static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400213acpi_ns_init_one_object(acpi_handle obj_handle,
214 u32 level, void *context, void **return_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
Len Brown4be44fc2005-08-05 00:44:28 -0400216 acpi_object_type type;
Len Brown4d2acd92007-05-09 22:56:38 -0400217 acpi_status status = AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400218 struct acpi_init_walk_info *info =
219 (struct acpi_init_walk_info *)context;
220 struct acpi_namespace_node *node =
221 (struct acpi_namespace_node *)obj_handle;
222 union acpi_operand_object *obj_desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Bob Mooreb229cf92006-04-21 17:15:00 -0400224 ACPI_FUNCTION_NAME(ns_init_one_object);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 info->object_count++;
227
228 /* And even then, we are only interested in a few object types */
229
Len Brown4be44fc2005-08-05 00:44:28 -0400230 type = acpi_ns_get_type(obj_handle);
231 obj_desc = acpi_ns_get_attached_object(node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 if (!obj_desc) {
233 return (AE_OK);
234 }
235
236 /* Increment counters for object types we are looking for */
237
238 switch (type) {
239 case ACPI_TYPE_REGION:
240 info->op_region_count++;
241 break;
242
243 case ACPI_TYPE_BUFFER_FIELD:
244 info->field_count++;
245 break;
246
247 case ACPI_TYPE_BUFFER:
248 info->buffer_count++;
249 break;
250
251 case ACPI_TYPE_PACKAGE:
252 info->package_count++;
253 break;
254
255 default:
256
257 /* No init required, just exit now */
258 return (AE_OK);
259 }
260
261 /*
262 * If the object is already initialized, nothing else to do
263 */
264 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
265 return (AE_OK);
266 }
267
268 /*
269 * Must lock the interpreter before executing AML code
270 */
Len Brown4d2acd92007-05-09 22:56:38 -0400271 acpi_ex_enter_interpreter();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273 /*
274 * Each of these types can contain executable AML code within the
275 * declaration.
276 */
277 switch (type) {
278 case ACPI_TYPE_REGION:
279
280 info->op_region_init++;
Len Brown4be44fc2005-08-05 00:44:28 -0400281 status = acpi_ds_get_region_arguments(obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 break;
283
284 case ACPI_TYPE_BUFFER_FIELD:
285
286 info->field_init++;
Len Brown4be44fc2005-08-05 00:44:28 -0400287 status = acpi_ds_get_buffer_field_arguments(obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 break;
289
290 case ACPI_TYPE_BUFFER:
291
292 info->buffer_init++;
Len Brown4be44fc2005-08-05 00:44:28 -0400293 status = acpi_ds_get_buffer_arguments(obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 break;
295
296 case ACPI_TYPE_PACKAGE:
297
298 info->package_init++;
Len Brown4be44fc2005-08-05 00:44:28 -0400299 status = acpi_ds_get_package_arguments(obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 break;
301
302 default:
303 /* No other types can get here */
304 break;
305 }
306
Len Brown4be44fc2005-08-05 00:44:28 -0400307 if (ACPI_FAILURE(status)) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500308 ACPI_EXCEPTION((AE_INFO, status,
309 "Could not execute arguments for [%4.4s] (%s)",
310 acpi_ut_get_node_name(node),
311 acpi_ut_get_type_name(type)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
313
314 /*
315 * Print a dot for each object unless we are going to print the entire
316 * pathname
317 */
318 if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400319 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 }
321
322 /*
323 * We ignore errors from above, and always return OK, since we don't want
324 * to abort the walk on any single error.
325 */
Len Brown4be44fc2005-08-05 00:44:28 -0400326 acpi_ex_exit_interpreter();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 return (AE_OK);
328}
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330/*******************************************************************************
331 *
Bob Mooreb229cf92006-04-21 17:15:00 -0400332 * FUNCTION: acpi_ns_find_ini_methods
333 *
334 * PARAMETERS: acpi_walk_callback
335 *
336 * RETURN: acpi_status
337 *
338 * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
339 * device/processor/thermal objects, and marks the entire subtree
340 * with a SUBTREE_HAS_INI flag. This flag is used during the
341 * subsequent device initialization walk to avoid entire subtrees
342 * that do not contain an _INI.
343 *
344 ******************************************************************************/
345
346static acpi_status
347acpi_ns_find_ini_methods(acpi_handle obj_handle,
348 u32 nesting_level, void *context, void **return_value)
349{
350 struct acpi_device_walk_info *info =
351 ACPI_CAST_PTR(struct acpi_device_walk_info, context);
352 struct acpi_namespace_node *node;
353 struct acpi_namespace_node *parent_node;
354
355 /* Keep count of device/processor/thermal objects */
356
357 node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
358 if ((node->type == ACPI_TYPE_DEVICE) ||
359 (node->type == ACPI_TYPE_PROCESSOR) ||
360 (node->type == ACPI_TYPE_THERMAL)) {
361 info->device_count++;
362 return (AE_OK);
363 }
364
365 /* We are only looking for methods named _INI */
366
367 if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
368 return (AE_OK);
369 }
370
371 /*
372 * The only _INI methods that we care about are those that are
373 * present under Device, Processor, and Thermal objects.
374 */
375 parent_node = acpi_ns_get_parent_node(node);
376 switch (parent_node->type) {
377 case ACPI_TYPE_DEVICE:
378 case ACPI_TYPE_PROCESSOR:
379 case ACPI_TYPE_THERMAL:
380
381 /* Mark parent and bubble up the INI present flag to the root */
382
383 while (parent_node) {
384 parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
385 parent_node = acpi_ns_get_parent_node(parent_node);
386 }
387 break;
388
389 default:
390 break;
391 }
392
393 return (AE_OK);
394}
395
396/*******************************************************************************
397 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 * FUNCTION: acpi_ns_init_one_device
399 *
400 * PARAMETERS: acpi_walk_callback
401 *
402 * RETURN: acpi_status
403 *
404 * DESCRIPTION: This is called once per device soon after ACPI is enabled
405 * to initialize each device. It determines if the device is
406 * present, and if so, calls _INI.
407 *
408 ******************************************************************************/
409
Robert Moore44f6c012005-04-18 22:49:35 -0400410static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400411acpi_ns_init_one_device(acpi_handle obj_handle,
412 u32 nesting_level, void *context, void **return_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413{
Bob Moore41195322006-05-26 16:36:00 -0400414 struct acpi_device_walk_info *walk_info =
Bob Mooreb229cf92006-04-21 17:15:00 -0400415 ACPI_CAST_PTR(struct acpi_device_walk_info, context);
Bob Moore41195322006-05-26 16:36:00 -0400416 struct acpi_evaluate_info *info = walk_info->evaluate_info;
Len Brown4be44fc2005-08-05 00:44:28 -0400417 u32 flags;
418 acpi_status status;
Bob Mooredefba1d2005-12-16 17:05:00 -0500419 struct acpi_namespace_node *device_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Bob Mooreb229cf92006-04-21 17:15:00 -0400421 ACPI_FUNCTION_TRACE(ns_init_one_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Bob Mooreb229cf92006-04-21 17:15:00 -0400423 /* We are interested in Devices, Processors and thermal_zones only */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Bob Mooreb229cf92006-04-21 17:15:00 -0400425 device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
Bob Mooredefba1d2005-12-16 17:05:00 -0500426 if ((device_node->type != ACPI_TYPE_DEVICE) &&
427 (device_node->type != ACPI_TYPE_PROCESSOR) &&
428 (device_node->type != ACPI_TYPE_THERMAL)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400429 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
431
Bob Mooreb229cf92006-04-21 17:15:00 -0400432 /*
433 * Because of an earlier namespace analysis, all subtrees that contain an
434 * _INI method are tagged.
435 *
436 * If this device subtree does not contain any _INI methods, we
437 * can exit now and stop traversing this entire subtree.
438 */
439 if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
440 return_ACPI_STATUS(AE_CTRL_DEPTH);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 }
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 /*
Bob Mooreb229cf92006-04-21 17:15:00 -0400444 * Run _STA to determine if this device is present and functioning. We
445 * must know this information for two important reasons (from ACPI spec):
446 *
447 * 1) We can only run _INI if the device is present.
448 * 2) We must abort the device tree walk on this subtree if the device is
449 * not present and is not functional (we will not examine the children)
450 *
451 * The _STA method is not required to be present under the device, we
452 * assume the device is present if _STA does not exist.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 */
Bob Mooreb229cf92006-04-21 17:15:00 -0400454 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
455 (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
456
457 status = acpi_ut_execute_STA(device_node, &flags);
Len Brown4be44fc2005-08-05 00:44:28 -0400458 if (ACPI_FAILURE(status)) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400459
Bob Mooreb229cf92006-04-21 17:15:00 -0400460 /* Ignore error and move on to next device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Bob Mooredefba1d2005-12-16 17:05:00 -0500462 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 }
464
465 /*
Bob Mooreb229cf92006-04-21 17:15:00 -0400466 * Flags == -1 means that _STA was not found. In this case, we assume that
467 * the device is both present and functional.
468 *
469 * From the ACPI spec, description of _STA:
470 *
471 * "If a device object (including the processor object) does not have an
472 * _STA object, then OSPM assumes that all of the above bits are set (in
473 * other words, the device is present, ..., and functioning)"
Bob Mooredefba1d2005-12-16 17:05:00 -0500474 */
Bob Mooreb229cf92006-04-21 17:15:00 -0400475 if (flags != ACPI_UINT32_MAX) {
Bob Moore41195322006-05-26 16:36:00 -0400476 walk_info->num_STA++;
Bob Mooreb229cf92006-04-21 17:15:00 -0400477 }
478
479 /*
480 * Examine the PRESENT and FUNCTIONING status bits
481 *
482 * Note: ACPI spec does not seem to specify behavior for the present but
483 * not functioning case, so we assume functioning if present.
484 */
485 if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
486
487 /* Device is not present, we must examine the Functioning bit */
488
489 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
490 /*
491 * Device is not present but is "functioning". In this case,
492 * we will not run _INI, but we continue to examine the children
493 * of this device.
494 *
495 * From the ACPI spec, description of _STA: (Note - no mention
496 * of whether to run _INI or not on the device in question)
497 *
498 * "_STA may return bit 0 clear (not present) with bit 3 set
499 * (device is functional). This case is used to indicate a valid
500 * device for which no device driver should be loaded (for example,
501 * a bridge device.) Children of this device may be present and
502 * valid. OSPM should continue enumeration below a device whose
503 * _STA returns this bit combination"
504 */
505 return_ACPI_STATUS(AE_OK);
506 } else {
507 /*
508 * Device is not present and is not functioning. We must abort the
509 * walk of this subtree immediately -- don't look at the children
510 * of such a device.
511 *
512 * From the ACPI spec, description of _INI:
513 *
514 * "If the _STA method indicates that the device is not present,
515 * OSPM will not run the _INI and will not examine the children
516 * of the device for _INI methods"
517 */
518 return_ACPI_STATUS(AE_CTRL_DEPTH);
519 }
520 }
521
522 /*
523 * The device is present or is assumed present if no _STA exists.
524 * Run the _INI if it exists (not required to exist)
525 *
526 * Note: We know there is an _INI within this subtree, but it may not be
527 * under this particular device, it may be lower in the branch.
528 */
529 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
530 (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI));
Bob Mooredefba1d2005-12-16 17:05:00 -0500531
Bob Moore41195322006-05-26 16:36:00 -0400532 info->prefix_node = device_node;
533 info->pathname = METHOD_NAME__INI;
534 info->parameters = NULL;
535 info->parameter_type = ACPI_PARAM_ARGS;
536 info->flags = ACPI_IGNORE_RETURN_VALUE;
Bob Mooredefba1d2005-12-16 17:05:00 -0500537
Ingo Molnar5d0e6002007-02-13 13:26:24 +0100538 /*
539 * Some hardware relies on this being executed as atomically
540 * as possible (without an NMI being received in the middle of
541 * this) - so disable NMIs and initialize the device:
542 */
543 acpi_nmi_disable();
Bob Moore41195322006-05-26 16:36:00 -0400544 status = acpi_ns_evaluate(info);
Ingo Molnar5d0e6002007-02-13 13:26:24 +0100545 acpi_nmi_enable();
546
Bob Mooreb229cf92006-04-21 17:15:00 -0400547 if (ACPI_SUCCESS(status)) {
Bob Moore41195322006-05-26 16:36:00 -0400548 walk_info->num_INI++;
Bob Moore52fc0b02006-10-02 00:00:00 -0400549
Bob Mooreb229cf92006-04-21 17:15:00 -0400550 if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) &&
551 (!(acpi_dbg_level & ACPI_LV_INFO))) {
552 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
553 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 }
Bob Mooreb229cf92006-04-21 17:15:00 -0400555#ifdef ACPI_DEBUG_OUTPUT
556 else if (status != AE_NOT_FOUND) {
557
558 /* Ignore error and move on to next device */
559
Bob Moore41195322006-05-26 16:36:00 -0400560 char *scope_name =
561 acpi_ns_get_external_pathname(info->resolved_node);
Bob Mooreb229cf92006-04-21 17:15:00 -0400562
563 ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution",
564 scope_name));
565 ACPI_FREE(scope_name);
566 }
567#endif
568
Bob Moore4c90ece2006-06-08 16:29:00 -0400569 /* Ignore errors from above */
570
571 status = AE_OK;
572
Bob Moore41195322006-05-26 16:36:00 -0400573 /*
574 * The _INI method has been run if present; call the Global Initialization
575 * Handler for this device.
576 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 if (acpi_gbl_init_handler) {
Len Brown4be44fc2005-08-05 00:44:28 -0400578 status =
Bob Moore41195322006-05-26 16:36:00 -0400579 acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 }
581
Bob Moore41195322006-05-26 16:36:00 -0400582 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}