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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: nsinit - namespace initialization | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
25f044e6 | 8 | * Copyright (C) 2000 - 2013, Intel Corp. |
1da177e4 LT |
9 | * 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 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acnamesp.h" | |
47 | #include "acdispat.h" | |
48 | #include "acinterp.h" | |
1da177e4 LT |
49 | |
50 | #define _COMPONENT ACPI_NAMESPACE | |
4be44fcd | 51 | ACPI_MODULE_NAME("nsinit") |
1da177e4 | 52 | |
44f6c012 | 53 | /* Local prototypes */ |
44f6c012 | 54 | static acpi_status |
4be44fcd LB |
55 | acpi_ns_init_one_object(acpi_handle obj_handle, |
56 | u32 level, void *context, void **return_value); | |
44f6c012 RM |
57 | |
58 | static acpi_status | |
4be44fcd LB |
59 | acpi_ns_init_one_device(acpi_handle obj_handle, |
60 | u32 nesting_level, void *context, void **return_value); | |
1da177e4 | 61 | |
b229cf92 BM |
62 | static acpi_status |
63 | acpi_ns_find_ini_methods(acpi_handle obj_handle, | |
64 | u32 nesting_level, void *context, void **return_value); | |
65 | ||
1da177e4 LT |
66 | /******************************************************************************* |
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 | ||
4be44fcd | 79 | acpi_status acpi_ns_initialize_objects(void) |
1da177e4 | 80 | { |
4be44fcd LB |
81 | acpi_status status; |
82 | struct acpi_init_walk_info info; | |
1da177e4 | 83 | |
b229cf92 | 84 | ACPI_FUNCTION_TRACE(ns_initialize_objects); |
1da177e4 | 85 | |
4be44fcd LB |
86 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
87 | "**** Starting initialization of namespace objects ****\n")); | |
88 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, | |
2fae3e56 | 89 | "Completing Region/Field/Buffer/Package initialization:\n")); |
1da177e4 LT |
90 | |
91 | /* Set all init info to zero */ | |
92 | ||
4be44fcd | 93 | ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info)); |
1da177e4 LT |
94 | |
95 | /* Walk entire namespace from the supplied root */ | |
96 | ||
4be44fcd | 97 | status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, |
1f86e8c1 LZ |
98 | ACPI_UINT32_MAX, acpi_ns_init_one_object, |
99 | NULL, &info, NULL); | |
4be44fcd | 100 | if (ACPI_FAILURE(status)) { |
b229cf92 | 101 | ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace")); |
1da177e4 LT |
102 | } |
103 | ||
4be44fcd | 104 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
3e5621a7 | 105 | " Initialized %u/%u Regions %u/%u Fields %u/%u " |
96b7b7ad | 106 | "Buffers %u/%u Packages (%u nodes)\n", |
4be44fcd LB |
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, | |
111 | info.object_count)); | |
1da177e4 | 112 | |
4be44fcd | 113 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
96b7b7ad | 114 | "%u Control Methods found\n", info.method_count)); |
4be44fcd | 115 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
96b7b7ad | 116 | "%u Op Regions found\n", info.op_region_count)); |
1da177e4 | 117 | |
4be44fcd | 118 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
119 | } |
120 | ||
1da177e4 LT |
121 | /******************************************************************************* |
122 | * | |
123 | * FUNCTION: acpi_ns_initialize_devices | |
124 | * | |
125 | * PARAMETERS: None | |
126 | * | |
127 | * RETURN: acpi_status | |
128 | * | |
129 | * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices. | |
130 | * This means running _INI on all present devices. | |
131 | * | |
132 | * Note: We install PCI config space handler on region access, | |
133 | * not here. | |
134 | * | |
135 | ******************************************************************************/ | |
136 | ||
4be44fcd | 137 | acpi_status acpi_ns_initialize_devices(void) |
1da177e4 | 138 | { |
4be44fcd LB |
139 | acpi_status status; |
140 | struct acpi_device_walk_info info; | |
1da177e4 | 141 | |
b229cf92 | 142 | ACPI_FUNCTION_TRACE(ns_initialize_devices); |
1da177e4 LT |
143 | |
144 | /* Init counters */ | |
145 | ||
146 | info.device_count = 0; | |
147 | info.num_STA = 0; | |
148 | info.num_INI = 0; | |
149 | ||
4be44fcd | 150 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
d4913dc6 | 151 | "Initializing Device/Processor/Thermal objects " |
3e5621a7 | 152 | "and executing _INI/_STA methods:\n")); |
b229cf92 BM |
153 | |
154 | /* Tree analysis: find all subtrees that contain _INI methods */ | |
1da177e4 | 155 | |
b229cf92 BM |
156 | status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, |
157 | ACPI_UINT32_MAX, FALSE, | |
2263576c LM |
158 | acpi_ns_find_ini_methods, NULL, &info, |
159 | NULL); | |
4be44fcd | 160 | if (ACPI_FAILURE(status)) { |
4119532c BM |
161 | goto error_exit; |
162 | } | |
163 | ||
164 | /* Allocate the evaluation information block */ | |
165 | ||
166 | info.evaluate_info = | |
167 | ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
168 | if (!info.evaluate_info) { | |
169 | status = AE_NO_MEMORY; | |
170 | goto error_exit; | |
1da177e4 LT |
171 | } |
172 | ||
9e64155e BM |
173 | /* |
174 | * Execute the "global" _INI method that may appear at the root. This | |
175 | * support is provided for Windows compatibility (Vista+) and is not | |
176 | * part of the ACPI specification. | |
177 | */ | |
178 | info.evaluate_info->prefix_node = acpi_gbl_root_node; | |
29a241cc | 179 | info.evaluate_info->relative_pathname = METHOD_NAME__INI; |
9e64155e BM |
180 | info.evaluate_info->parameters = NULL; |
181 | info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE; | |
182 | ||
183 | status = acpi_ns_evaluate(info.evaluate_info); | |
184 | if (ACPI_SUCCESS(status)) { | |
185 | info.num_INI++; | |
186 | } | |
187 | ||
b229cf92 | 188 | /* Walk namespace to execute all _INIs on present devices */ |
1da177e4 | 189 | |
4be44fcd | 190 | status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, |
b229cf92 | 191 | ACPI_UINT32_MAX, FALSE, |
2263576c LM |
192 | acpi_ns_init_one_device, NULL, &info, |
193 | NULL); | |
4119532c | 194 | |
b681f7d9 MG |
195 | /* |
196 | * Any _OSI requests should be completed by now. If the BIOS has | |
197 | * requested any Windows OSI strings, we will always truncate | |
198 | * I/O addresses to 16 bits -- for Windows compatibility. | |
199 | */ | |
200 | if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) { | |
201 | acpi_gbl_truncate_io_addresses = TRUE; | |
202 | } | |
203 | ||
4119532c | 204 | ACPI_FREE(info.evaluate_info); |
4be44fcd | 205 | if (ACPI_FAILURE(status)) { |
4119532c | 206 | goto error_exit; |
1da177e4 LT |
207 | } |
208 | ||
4be44fcd | 209 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
3e5621a7 | 210 | " Executed %u _INI methods requiring %u _STA executions " |
5821f754 | 211 | "(examined %u objects)\n", |
b229cf92 | 212 | info.num_INI, info.num_STA, info.device_count)); |
1da177e4 | 213 | |
4be44fcd | 214 | return_ACPI_STATUS(status); |
4119532c BM |
215 | |
216 | error_exit: | |
217 | ACPI_EXCEPTION((AE_INFO, status, "During device initialization")); | |
218 | return_ACPI_STATUS(status); | |
1da177e4 LT |
219 | } |
220 | ||
1da177e4 LT |
221 | /******************************************************************************* |
222 | * | |
223 | * FUNCTION: acpi_ns_init_one_object | |
224 | * | |
225 | * PARAMETERS: obj_handle - Node | |
ba494bee BM |
226 | * level - Current nesting level |
227 | * context - Points to a init info struct | |
1da177e4 LT |
228 | * return_value - Not used |
229 | * | |
230 | * RETURN: Status | |
231 | * | |
232 | * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object | |
233 | * within the namespace. | |
234 | * | |
235 | * Currently, the only objects that require initialization are: | |
236 | * 1) Methods | |
237 | * 2) Op Regions | |
238 | * | |
239 | ******************************************************************************/ | |
240 | ||
44f6c012 | 241 | static acpi_status |
4be44fcd LB |
242 | acpi_ns_init_one_object(acpi_handle obj_handle, |
243 | u32 level, void *context, void **return_value) | |
1da177e4 | 244 | { |
4be44fcd | 245 | acpi_object_type type; |
4d2acd9e | 246 | acpi_status status = AE_OK; |
4be44fcd LB |
247 | struct acpi_init_walk_info *info = |
248 | (struct acpi_init_walk_info *)context; | |
249 | struct acpi_namespace_node *node = | |
250 | (struct acpi_namespace_node *)obj_handle; | |
251 | union acpi_operand_object *obj_desc; | |
1da177e4 | 252 | |
b229cf92 | 253 | ACPI_FUNCTION_NAME(ns_init_one_object); |
1da177e4 LT |
254 | |
255 | info->object_count++; | |
256 | ||
257 | /* And even then, we are only interested in a few object types */ | |
258 | ||
4be44fcd LB |
259 | type = acpi_ns_get_type(obj_handle); |
260 | obj_desc = acpi_ns_get_attached_object(node); | |
1da177e4 LT |
261 | if (!obj_desc) { |
262 | return (AE_OK); | |
263 | } | |
264 | ||
265 | /* Increment counters for object types we are looking for */ | |
266 | ||
267 | switch (type) { | |
268 | case ACPI_TYPE_REGION: | |
269 | info->op_region_count++; | |
270 | break; | |
271 | ||
272 | case ACPI_TYPE_BUFFER_FIELD: | |
273 | info->field_count++; | |
274 | break; | |
275 | ||
ef805d95 LM |
276 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
277 | info->field_count++; | |
278 | break; | |
279 | ||
1da177e4 LT |
280 | case ACPI_TYPE_BUFFER: |
281 | info->buffer_count++; | |
282 | break; | |
283 | ||
284 | case ACPI_TYPE_PACKAGE: | |
285 | info->package_count++; | |
286 | break; | |
287 | ||
288 | default: | |
289 | ||
290 | /* No init required, just exit now */ | |
291 | return (AE_OK); | |
292 | } | |
293 | ||
d4913dc6 BM |
294 | /* If the object is already initialized, nothing else to do */ |
295 | ||
1da177e4 LT |
296 | if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { |
297 | return (AE_OK); | |
298 | } | |
299 | ||
d4913dc6 BM |
300 | /* Must lock the interpreter before executing AML code */ |
301 | ||
4d2acd9e | 302 | acpi_ex_enter_interpreter(); |
1da177e4 LT |
303 | |
304 | /* | |
305 | * Each of these types can contain executable AML code within the | |
306 | * declaration. | |
307 | */ | |
308 | switch (type) { | |
309 | case ACPI_TYPE_REGION: | |
310 | ||
311 | info->op_region_init++; | |
4be44fcd | 312 | status = acpi_ds_get_region_arguments(obj_desc); |
1da177e4 LT |
313 | break; |
314 | ||
315 | case ACPI_TYPE_BUFFER_FIELD: | |
316 | ||
317 | info->field_init++; | |
4be44fcd | 318 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
1da177e4 LT |
319 | break; |
320 | ||
ef805d95 LM |
321 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
322 | ||
323 | info->field_init++; | |
324 | status = acpi_ds_get_bank_field_arguments(obj_desc); | |
325 | break; | |
326 | ||
1da177e4 LT |
327 | case ACPI_TYPE_BUFFER: |
328 | ||
329 | info->buffer_init++; | |
4be44fcd | 330 | status = acpi_ds_get_buffer_arguments(obj_desc); |
1da177e4 LT |
331 | break; |
332 | ||
333 | case ACPI_TYPE_PACKAGE: | |
334 | ||
335 | info->package_init++; | |
4be44fcd | 336 | status = acpi_ds_get_package_arguments(obj_desc); |
1da177e4 LT |
337 | break; |
338 | ||
339 | default: | |
340 | /* No other types can get here */ | |
341 | break; | |
342 | } | |
343 | ||
4be44fcd | 344 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
345 | ACPI_EXCEPTION((AE_INFO, status, |
346 | "Could not execute arguments for [%4.4s] (%s)", | |
347 | acpi_ut_get_node_name(node), | |
348 | acpi_ut_get_type_name(type))); | |
1da177e4 LT |
349 | } |
350 | ||
1da177e4 LT |
351 | /* |
352 | * We ignore errors from above, and always return OK, since we don't want | |
353 | * to abort the walk on any single error. | |
354 | */ | |
4be44fcd | 355 | acpi_ex_exit_interpreter(); |
1da177e4 LT |
356 | return (AE_OK); |
357 | } | |
358 | ||
b229cf92 BM |
359 | /******************************************************************************* |
360 | * | |
361 | * FUNCTION: acpi_ns_find_ini_methods | |
362 | * | |
363 | * PARAMETERS: acpi_walk_callback | |
364 | * | |
365 | * RETURN: acpi_status | |
366 | * | |
367 | * DESCRIPTION: Called during namespace walk. Finds objects named _INI under | |
368 | * device/processor/thermal objects, and marks the entire subtree | |
369 | * with a SUBTREE_HAS_INI flag. This flag is used during the | |
370 | * subsequent device initialization walk to avoid entire subtrees | |
371 | * that do not contain an _INI. | |
372 | * | |
373 | ******************************************************************************/ | |
374 | ||
375 | static acpi_status | |
376 | acpi_ns_find_ini_methods(acpi_handle obj_handle, | |
377 | u32 nesting_level, void *context, void **return_value) | |
378 | { | |
379 | struct acpi_device_walk_info *info = | |
380 | ACPI_CAST_PTR(struct acpi_device_walk_info, context); | |
381 | struct acpi_namespace_node *node; | |
382 | struct acpi_namespace_node *parent_node; | |
383 | ||
384 | /* Keep count of device/processor/thermal objects */ | |
385 | ||
386 | node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); | |
387 | if ((node->type == ACPI_TYPE_DEVICE) || | |
388 | (node->type == ACPI_TYPE_PROCESSOR) || | |
389 | (node->type == ACPI_TYPE_THERMAL)) { | |
390 | info->device_count++; | |
391 | return (AE_OK); | |
392 | } | |
393 | ||
394 | /* We are only looking for methods named _INI */ | |
395 | ||
396 | if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) { | |
397 | return (AE_OK); | |
398 | } | |
399 | ||
400 | /* | |
401 | * The only _INI methods that we care about are those that are | |
402 | * present under Device, Processor, and Thermal objects. | |
403 | */ | |
c45b5c09 | 404 | parent_node = node->parent; |
b229cf92 BM |
405 | switch (parent_node->type) { |
406 | case ACPI_TYPE_DEVICE: | |
407 | case ACPI_TYPE_PROCESSOR: | |
408 | case ACPI_TYPE_THERMAL: | |
409 | ||
410 | /* Mark parent and bubble up the INI present flag to the root */ | |
411 | ||
412 | while (parent_node) { | |
413 | parent_node->flags |= ANOBJ_SUBTREE_HAS_INI; | |
c45b5c09 | 414 | parent_node = parent_node->parent; |
b229cf92 BM |
415 | } |
416 | break; | |
417 | ||
418 | default: | |
419 | break; | |
420 | } | |
421 | ||
422 | return (AE_OK); | |
423 | } | |
424 | ||
1da177e4 LT |
425 | /******************************************************************************* |
426 | * | |
427 | * FUNCTION: acpi_ns_init_one_device | |
428 | * | |
429 | * PARAMETERS: acpi_walk_callback | |
430 | * | |
431 | * RETURN: acpi_status | |
432 | * | |
433 | * DESCRIPTION: This is called once per device soon after ACPI is enabled | |
434 | * to initialize each device. It determines if the device is | |
435 | * present, and if so, calls _INI. | |
436 | * | |
437 | ******************************************************************************/ | |
438 | ||
44f6c012 | 439 | static acpi_status |
4be44fcd LB |
440 | acpi_ns_init_one_device(acpi_handle obj_handle, |
441 | u32 nesting_level, void *context, void **return_value) | |
1da177e4 | 442 | { |
4119532c | 443 | struct acpi_device_walk_info *walk_info = |
b229cf92 | 444 | ACPI_CAST_PTR(struct acpi_device_walk_info, context); |
4119532c | 445 | struct acpi_evaluate_info *info = walk_info->evaluate_info; |
4be44fcd LB |
446 | u32 flags; |
447 | acpi_status status; | |
defba1d8 | 448 | struct acpi_namespace_node *device_node; |
1da177e4 | 449 | |
b229cf92 | 450 | ACPI_FUNCTION_TRACE(ns_init_one_device); |
1da177e4 | 451 | |
b229cf92 | 452 | /* We are interested in Devices, Processors and thermal_zones only */ |
1da177e4 | 453 | |
b229cf92 | 454 | device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); |
defba1d8 BM |
455 | if ((device_node->type != ACPI_TYPE_DEVICE) && |
456 | (device_node->type != ACPI_TYPE_PROCESSOR) && | |
457 | (device_node->type != ACPI_TYPE_THERMAL)) { | |
4be44fcd | 458 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
459 | } |
460 | ||
1da177e4 | 461 | /* |
b229cf92 BM |
462 | * Because of an earlier namespace analysis, all subtrees that contain an |
463 | * _INI method are tagged. | |
464 | * | |
465 | * If this device subtree does not contain any _INI methods, we | |
466 | * can exit now and stop traversing this entire subtree. | |
defba1d8 | 467 | */ |
b229cf92 BM |
468 | if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) { |
469 | return_ACPI_STATUS(AE_CTRL_DEPTH); | |
defba1d8 BM |
470 | } |
471 | ||
472 | /* | |
b229cf92 BM |
473 | * Run _STA to determine if this device is present and functioning. We |
474 | * must know this information for two important reasons (from ACPI spec): | |
475 | * | |
476 | * 1) We can only run _INI if the device is present. | |
477 | * 2) We must abort the device tree walk on this subtree if the device is | |
478 | * not present and is not functional (we will not examine the children) | |
479 | * | |
480 | * The _STA method is not required to be present under the device, we | |
481 | * assume the device is present if _STA does not exist. | |
1da177e4 | 482 | */ |
b229cf92 BM |
483 | ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname |
484 | (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA)); | |
1da177e4 | 485 | |
b229cf92 | 486 | status = acpi_ut_execute_STA(device_node, &flags); |
4be44fcd | 487 | if (ACPI_FAILURE(status)) { |
52fc0b02 | 488 | |
defba1d8 | 489 | /* Ignore error and move on to next device */ |
1da177e4 | 490 | |
defba1d8 BM |
491 | return_ACPI_STATUS(AE_OK); |
492 | } | |
1da177e4 | 493 | |
b229cf92 BM |
494 | /* |
495 | * Flags == -1 means that _STA was not found. In this case, we assume that | |
496 | * the device is both present and functional. | |
497 | * | |
498 | * From the ACPI spec, description of _STA: | |
499 | * | |
500 | * "If a device object (including the processor object) does not have an | |
501 | * _STA object, then OSPM assumes that all of the above bits are set (in | |
502 | * other words, the device is present, ..., and functioning)" | |
503 | */ | |
defba1d8 | 504 | if (flags != ACPI_UINT32_MAX) { |
4119532c | 505 | walk_info->num_STA++; |
defba1d8 | 506 | } |
1da177e4 | 507 | |
b229cf92 BM |
508 | /* |
509 | * Examine the PRESENT and FUNCTIONING status bits | |
510 | * | |
511 | * Note: ACPI spec does not seem to specify behavior for the present but | |
512 | * not functioning case, so we assume functioning if present. | |
513 | */ | |
defba1d8 | 514 | if (!(flags & ACPI_STA_DEVICE_PRESENT)) { |
52fc0b02 | 515 | |
b229cf92 BM |
516 | /* Device is not present, we must examine the Functioning bit */ |
517 | ||
518 | if (flags & ACPI_STA_DEVICE_FUNCTIONING) { | |
519 | /* | |
520 | * Device is not present but is "functioning". In this case, | |
521 | * we will not run _INI, but we continue to examine the children | |
522 | * of this device. | |
523 | * | |
ba494bee | 524 | * From the ACPI spec, description of _STA: (note - no mention |
b229cf92 BM |
525 | * of whether to run _INI or not on the device in question) |
526 | * | |
527 | * "_STA may return bit 0 clear (not present) with bit 3 set | |
528 | * (device is functional). This case is used to indicate a valid | |
529 | * device for which no device driver should be loaded (for example, | |
530 | * a bridge device.) Children of this device may be present and | |
531 | * valid. OSPM should continue enumeration below a device whose | |
532 | * _STA returns this bit combination" | |
533 | */ | |
534 | return_ACPI_STATUS(AE_OK); | |
535 | } else { | |
536 | /* | |
537 | * Device is not present and is not functioning. We must abort the | |
538 | * walk of this subtree immediately -- don't look at the children | |
539 | * of such a device. | |
540 | * | |
541 | * From the ACPI spec, description of _INI: | |
542 | * | |
543 | * "If the _STA method indicates that the device is not present, | |
544 | * OSPM will not run the _INI and will not examine the children | |
545 | * of the device for _INI methods" | |
546 | */ | |
547 | return_ACPI_STATUS(AE_CTRL_DEPTH); | |
548 | } | |
1da177e4 LT |
549 | } |
550 | ||
551 | /* | |
b229cf92 BM |
552 | * The device is present or is assumed present if no _STA exists. |
553 | * Run the _INI if it exists (not required to exist) | |
554 | * | |
555 | * Note: We know there is an _INI within this subtree, but it may not be | |
556 | * under this particular device, it may be lower in the branch. | |
1da177e4 | 557 | */ |
b229cf92 BM |
558 | ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname |
559 | (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI)); | |
1da177e4 | 560 | |
04a29a15 | 561 | ACPI_MEMSET(info, 0, sizeof(struct acpi_evaluate_info)); |
4119532c | 562 | info->prefix_node = device_node; |
29a241cc | 563 | info->relative_pathname = METHOD_NAME__INI; |
4119532c | 564 | info->parameters = NULL; |
4119532c | 565 | info->flags = ACPI_IGNORE_RETURN_VALUE; |
1da177e4 | 566 | |
4119532c | 567 | status = acpi_ns_evaluate(info); |
5d0e600d | 568 | |
b229cf92 | 569 | if (ACPI_SUCCESS(status)) { |
4119532c | 570 | walk_info->num_INI++; |
1da177e4 | 571 | } |
b229cf92 BM |
572 | #ifdef ACPI_DEBUG_OUTPUT |
573 | else if (status != AE_NOT_FOUND) { | |
1da177e4 | 574 | |
b229cf92 BM |
575 | /* Ignore error and move on to next device */ |
576 | ||
29a241cc | 577 | char *scope_name = acpi_ns_get_external_pathname(info->node); |
52fc0b02 | 578 | |
b229cf92 BM |
579 | ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution", |
580 | scope_name)); | |
581 | ACPI_FREE(scope_name); | |
582 | } | |
583 | #endif | |
1da177e4 | 584 | |
4c90ece2 BM |
585 | /* Ignore errors from above */ |
586 | ||
587 | status = AE_OK; | |
588 | ||
4119532c BM |
589 | /* |
590 | * The _INI method has been run if present; call the Global Initialization | |
591 | * Handler for this device. | |
592 | */ | |
b229cf92 | 593 | if (acpi_gbl_init_handler) { |
4be44fcd | 594 | status = |
4119532c | 595 | acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI); |
1da177e4 LT |
596 | } |
597 | ||
4119532c | 598 | return_ACPI_STATUS(status); |
1da177e4 | 599 | } |