Commit | Line | Data |
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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: nsinit - namespace initialization | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, 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" | |
5d0e600d | 49 | #include <linux/nmi.h> |
1da177e4 LT |
50 | |
51 | #define _COMPONENT ACPI_NAMESPACE | |
4be44fcd | 52 | ACPI_MODULE_NAME("nsinit") |
1da177e4 | 53 | |
44f6c012 | 54 | /* Local prototypes */ |
44f6c012 | 55 | static acpi_status |
4be44fcd LB |
56 | acpi_ns_init_one_object(acpi_handle obj_handle, |
57 | u32 level, void *context, void **return_value); | |
44f6c012 RM |
58 | |
59 | static acpi_status | |
4be44fcd LB |
60 | acpi_ns_init_one_device(acpi_handle obj_handle, |
61 | u32 nesting_level, void *context, void **return_value); | |
1da177e4 | 62 | |
b229cf92 BM |
63 | static acpi_status |
64 | acpi_ns_find_ini_methods(acpi_handle obj_handle, | |
65 | u32 nesting_level, void *context, void **return_value); | |
66 | ||
1da177e4 LT |
67 | /******************************************************************************* |
68 | * | |
69 | * FUNCTION: acpi_ns_initialize_objects | |
70 | * | |
71 | * PARAMETERS: None | |
72 | * | |
73 | * RETURN: Status | |
74 | * | |
75 | * DESCRIPTION: Walk the entire namespace and perform any necessary | |
76 | * initialization on the objects found therein | |
77 | * | |
78 | ******************************************************************************/ | |
79 | ||
4be44fcd | 80 | acpi_status acpi_ns_initialize_objects(void) |
1da177e4 | 81 | { |
4be44fcd LB |
82 | acpi_status status; |
83 | struct acpi_init_walk_info info; | |
1da177e4 | 84 | |
b229cf92 | 85 | ACPI_FUNCTION_TRACE(ns_initialize_objects); |
1da177e4 | 86 | |
4be44fcd LB |
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:")); | |
1da177e4 LT |
91 | |
92 | /* Set all init info to zero */ | |
93 | ||
4be44fcd | 94 | ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info)); |
1da177e4 LT |
95 | |
96 | /* Walk entire namespace from the supplied root */ | |
97 | ||
4be44fcd LB |
98 | status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, |
99 | ACPI_UINT32_MAX, acpi_ns_init_one_object, | |
100 | &info, NULL); | |
101 | if (ACPI_FAILURE(status)) { | |
b229cf92 | 102 | ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace")); |
1da177e4 LT |
103 | } |
104 | ||
4be44fcd | 105 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
d4913dc6 BM |
106 | "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd " |
107 | "Buffers %hd/%hd Packages (%hd nodes)\n", | |
4be44fcd LB |
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, | |
112 | info.object_count)); | |
1da177e4 | 113 | |
4be44fcd LB |
114 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
115 | "%hd Control Methods found\n", info.method_count)); | |
116 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, | |
117 | "%hd Op Regions found\n", info.op_region_count)); | |
1da177e4 | 118 | |
4be44fcd | 119 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 LT |
122 | /******************************************************************************* |
123 | * | |
124 | * FUNCTION: acpi_ns_initialize_devices | |
125 | * | |
126 | * PARAMETERS: None | |
127 | * | |
128 | * RETURN: acpi_status | |
129 | * | |
130 | * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices. | |
131 | * This means running _INI on all present devices. | |
132 | * | |
133 | * Note: We install PCI config space handler on region access, | |
134 | * not here. | |
135 | * | |
136 | ******************************************************************************/ | |
137 | ||
4be44fcd | 138 | acpi_status acpi_ns_initialize_devices(void) |
1da177e4 | 139 | { |
4be44fcd LB |
140 | acpi_status status; |
141 | struct acpi_device_walk_info info; | |
1da177e4 | 142 | |
b229cf92 | 143 | ACPI_FUNCTION_TRACE(ns_initialize_devices); |
1da177e4 LT |
144 | |
145 | /* Init counters */ | |
146 | ||
147 | info.device_count = 0; | |
148 | info.num_STA = 0; | |
149 | info.num_INI = 0; | |
150 | ||
4be44fcd | 151 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
d4913dc6 BM |
152 | "Initializing Device/Processor/Thermal objects " |
153 | "by executing _INI methods:")); | |
b229cf92 BM |
154 | |
155 | /* Tree analysis: find all subtrees that contain _INI methods */ | |
1da177e4 | 156 | |
b229cf92 BM |
157 | status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, |
158 | ACPI_UINT32_MAX, FALSE, | |
159 | acpi_ns_find_ini_methods, &info, 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; | |
179 | info.evaluate_info->pathname = METHOD_NAME__INI; | |
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, |
4be44fcd | 192 | acpi_ns_init_one_device, &info, NULL); |
4119532c BM |
193 | |
194 | ACPI_FREE(info.evaluate_info); | |
4be44fcd | 195 | if (ACPI_FAILURE(status)) { |
4119532c | 196 | goto error_exit; |
1da177e4 LT |
197 | } |
198 | ||
4be44fcd | 199 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
d4913dc6 BM |
200 | "\nExecuted %hd _INI methods requiring %hd _STA executions " |
201 | "(examined %hd objects)\n", | |
b229cf92 | 202 | info.num_INI, info.num_STA, info.device_count)); |
1da177e4 | 203 | |
4be44fcd | 204 | return_ACPI_STATUS(status); |
4119532c BM |
205 | |
206 | error_exit: | |
207 | ACPI_EXCEPTION((AE_INFO, status, "During device initialization")); | |
208 | return_ACPI_STATUS(status); | |
1da177e4 LT |
209 | } |
210 | ||
1da177e4 LT |
211 | /******************************************************************************* |
212 | * | |
213 | * FUNCTION: acpi_ns_init_one_object | |
214 | * | |
215 | * PARAMETERS: obj_handle - Node | |
216 | * Level - Current nesting level | |
217 | * Context - Points to a init info struct | |
218 | * return_value - Not used | |
219 | * | |
220 | * RETURN: Status | |
221 | * | |
222 | * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object | |
223 | * within the namespace. | |
224 | * | |
225 | * Currently, the only objects that require initialization are: | |
226 | * 1) Methods | |
227 | * 2) Op Regions | |
228 | * | |
229 | ******************************************************************************/ | |
230 | ||
44f6c012 | 231 | static acpi_status |
4be44fcd LB |
232 | acpi_ns_init_one_object(acpi_handle obj_handle, |
233 | u32 level, void *context, void **return_value) | |
1da177e4 | 234 | { |
4be44fcd | 235 | acpi_object_type type; |
4d2acd9e | 236 | acpi_status status = AE_OK; |
4be44fcd LB |
237 | struct acpi_init_walk_info *info = |
238 | (struct acpi_init_walk_info *)context; | |
239 | struct acpi_namespace_node *node = | |
240 | (struct acpi_namespace_node *)obj_handle; | |
241 | union acpi_operand_object *obj_desc; | |
1da177e4 | 242 | |
b229cf92 | 243 | ACPI_FUNCTION_NAME(ns_init_one_object); |
1da177e4 LT |
244 | |
245 | info->object_count++; | |
246 | ||
247 | /* And even then, we are only interested in a few object types */ | |
248 | ||
4be44fcd LB |
249 | type = acpi_ns_get_type(obj_handle); |
250 | obj_desc = acpi_ns_get_attached_object(node); | |
1da177e4 LT |
251 | if (!obj_desc) { |
252 | return (AE_OK); | |
253 | } | |
254 | ||
255 | /* Increment counters for object types we are looking for */ | |
256 | ||
257 | switch (type) { | |
258 | case ACPI_TYPE_REGION: | |
259 | info->op_region_count++; | |
260 | break; | |
261 | ||
262 | case ACPI_TYPE_BUFFER_FIELD: | |
263 | info->field_count++; | |
264 | break; | |
265 | ||
ef805d95 LM |
266 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
267 | info->field_count++; | |
268 | break; | |
269 | ||
1da177e4 LT |
270 | case ACPI_TYPE_BUFFER: |
271 | info->buffer_count++; | |
272 | break; | |
273 | ||
274 | case ACPI_TYPE_PACKAGE: | |
275 | info->package_count++; | |
276 | break; | |
277 | ||
278 | default: | |
279 | ||
280 | /* No init required, just exit now */ | |
281 | return (AE_OK); | |
282 | } | |
283 | ||
d4913dc6 BM |
284 | /* If the object is already initialized, nothing else to do */ |
285 | ||
1da177e4 LT |
286 | if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { |
287 | return (AE_OK); | |
288 | } | |
289 | ||
d4913dc6 BM |
290 | /* Must lock the interpreter before executing AML code */ |
291 | ||
4d2acd9e | 292 | acpi_ex_enter_interpreter(); |
1da177e4 LT |
293 | |
294 | /* | |
295 | * Each of these types can contain executable AML code within the | |
296 | * declaration. | |
297 | */ | |
298 | switch (type) { | |
299 | case ACPI_TYPE_REGION: | |
300 | ||
301 | info->op_region_init++; | |
4be44fcd | 302 | status = acpi_ds_get_region_arguments(obj_desc); |
1da177e4 LT |
303 | break; |
304 | ||
305 | case ACPI_TYPE_BUFFER_FIELD: | |
306 | ||
307 | info->field_init++; | |
4be44fcd | 308 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
1da177e4 LT |
309 | break; |
310 | ||
ef805d95 LM |
311 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
312 | ||
313 | info->field_init++; | |
314 | status = acpi_ds_get_bank_field_arguments(obj_desc); | |
315 | break; | |
316 | ||
1da177e4 LT |
317 | case ACPI_TYPE_BUFFER: |
318 | ||
319 | info->buffer_init++; | |
4be44fcd | 320 | status = acpi_ds_get_buffer_arguments(obj_desc); |
1da177e4 LT |
321 | break; |
322 | ||
323 | case ACPI_TYPE_PACKAGE: | |
324 | ||
325 | info->package_init++; | |
4be44fcd | 326 | status = acpi_ds_get_package_arguments(obj_desc); |
1da177e4 LT |
327 | break; |
328 | ||
329 | default: | |
330 | /* No other types can get here */ | |
331 | break; | |
332 | } | |
333 | ||
4be44fcd | 334 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
335 | ACPI_EXCEPTION((AE_INFO, status, |
336 | "Could not execute arguments for [%4.4s] (%s)", | |
337 | acpi_ut_get_node_name(node), | |
338 | acpi_ut_get_type_name(type))); | |
1da177e4 LT |
339 | } |
340 | ||
341 | /* | |
342 | * Print a dot for each object unless we are going to print the entire | |
343 | * pathname | |
344 | */ | |
345 | if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) { | |
4be44fcd | 346 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, ".")); |
1da177e4 LT |
347 | } |
348 | ||
349 | /* | |
350 | * We ignore errors from above, and always return OK, since we don't want | |
351 | * to abort the walk on any single error. | |
352 | */ | |
4be44fcd | 353 | acpi_ex_exit_interpreter(); |
1da177e4 LT |
354 | return (AE_OK); |
355 | } | |
356 | ||
b229cf92 BM |
357 | /******************************************************************************* |
358 | * | |
359 | * FUNCTION: acpi_ns_find_ini_methods | |
360 | * | |
361 | * PARAMETERS: acpi_walk_callback | |
362 | * | |
363 | * RETURN: acpi_status | |
364 | * | |
365 | * DESCRIPTION: Called during namespace walk. Finds objects named _INI under | |
366 | * device/processor/thermal objects, and marks the entire subtree | |
367 | * with a SUBTREE_HAS_INI flag. This flag is used during the | |
368 | * subsequent device initialization walk to avoid entire subtrees | |
369 | * that do not contain an _INI. | |
370 | * | |
371 | ******************************************************************************/ | |
372 | ||
373 | static acpi_status | |
374 | acpi_ns_find_ini_methods(acpi_handle obj_handle, | |
375 | u32 nesting_level, void *context, void **return_value) | |
376 | { | |
377 | struct acpi_device_walk_info *info = | |
378 | ACPI_CAST_PTR(struct acpi_device_walk_info, context); | |
379 | struct acpi_namespace_node *node; | |
380 | struct acpi_namespace_node *parent_node; | |
381 | ||
382 | /* Keep count of device/processor/thermal objects */ | |
383 | ||
384 | node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); | |
385 | if ((node->type == ACPI_TYPE_DEVICE) || | |
386 | (node->type == ACPI_TYPE_PROCESSOR) || | |
387 | (node->type == ACPI_TYPE_THERMAL)) { | |
388 | info->device_count++; | |
389 | return (AE_OK); | |
390 | } | |
391 | ||
392 | /* We are only looking for methods named _INI */ | |
393 | ||
394 | if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) { | |
395 | return (AE_OK); | |
396 | } | |
397 | ||
398 | /* | |
399 | * The only _INI methods that we care about are those that are | |
400 | * present under Device, Processor, and Thermal objects. | |
401 | */ | |
402 | parent_node = acpi_ns_get_parent_node(node); | |
403 | switch (parent_node->type) { | |
404 | case ACPI_TYPE_DEVICE: | |
405 | case ACPI_TYPE_PROCESSOR: | |
406 | case ACPI_TYPE_THERMAL: | |
407 | ||
408 | /* Mark parent and bubble up the INI present flag to the root */ | |
409 | ||
410 | while (parent_node) { | |
411 | parent_node->flags |= ANOBJ_SUBTREE_HAS_INI; | |
412 | parent_node = acpi_ns_get_parent_node(parent_node); | |
413 | } | |
414 | break; | |
415 | ||
416 | default: | |
417 | break; | |
418 | } | |
419 | ||
420 | return (AE_OK); | |
421 | } | |
422 | ||
1da177e4 LT |
423 | /******************************************************************************* |
424 | * | |
425 | * FUNCTION: acpi_ns_init_one_device | |
426 | * | |
427 | * PARAMETERS: acpi_walk_callback | |
428 | * | |
429 | * RETURN: acpi_status | |
430 | * | |
431 | * DESCRIPTION: This is called once per device soon after ACPI is enabled | |
432 | * to initialize each device. It determines if the device is | |
433 | * present, and if so, calls _INI. | |
434 | * | |
435 | ******************************************************************************/ | |
436 | ||
44f6c012 | 437 | static acpi_status |
4be44fcd LB |
438 | acpi_ns_init_one_device(acpi_handle obj_handle, |
439 | u32 nesting_level, void *context, void **return_value) | |
1da177e4 | 440 | { |
4119532c | 441 | struct acpi_device_walk_info *walk_info = |
b229cf92 | 442 | ACPI_CAST_PTR(struct acpi_device_walk_info, context); |
4119532c | 443 | struct acpi_evaluate_info *info = walk_info->evaluate_info; |
4be44fcd LB |
444 | u32 flags; |
445 | acpi_status status; | |
defba1d8 | 446 | struct acpi_namespace_node *device_node; |
1da177e4 | 447 | |
b229cf92 | 448 | ACPI_FUNCTION_TRACE(ns_init_one_device); |
1da177e4 | 449 | |
b229cf92 | 450 | /* We are interested in Devices, Processors and thermal_zones only */ |
1da177e4 | 451 | |
b229cf92 | 452 | device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); |
defba1d8 BM |
453 | if ((device_node->type != ACPI_TYPE_DEVICE) && |
454 | (device_node->type != ACPI_TYPE_PROCESSOR) && | |
455 | (device_node->type != ACPI_TYPE_THERMAL)) { | |
4be44fcd | 456 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
457 | } |
458 | ||
1da177e4 | 459 | /* |
b229cf92 BM |
460 | * Because of an earlier namespace analysis, all subtrees that contain an |
461 | * _INI method are tagged. | |
462 | * | |
463 | * If this device subtree does not contain any _INI methods, we | |
464 | * can exit now and stop traversing this entire subtree. | |
defba1d8 | 465 | */ |
b229cf92 BM |
466 | if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) { |
467 | return_ACPI_STATUS(AE_CTRL_DEPTH); | |
defba1d8 BM |
468 | } |
469 | ||
470 | /* | |
b229cf92 BM |
471 | * Run _STA to determine if this device is present and functioning. We |
472 | * must know this information for two important reasons (from ACPI spec): | |
473 | * | |
474 | * 1) We can only run _INI if the device is present. | |
475 | * 2) We must abort the device tree walk on this subtree if the device is | |
476 | * not present and is not functional (we will not examine the children) | |
477 | * | |
478 | * The _STA method is not required to be present under the device, we | |
479 | * assume the device is present if _STA does not exist. | |
1da177e4 | 480 | */ |
b229cf92 BM |
481 | ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname |
482 | (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA)); | |
1da177e4 | 483 | |
b229cf92 | 484 | status = acpi_ut_execute_STA(device_node, &flags); |
4be44fcd | 485 | if (ACPI_FAILURE(status)) { |
52fc0b02 | 486 | |
defba1d8 | 487 | /* Ignore error and move on to next device */ |
1da177e4 | 488 | |
defba1d8 BM |
489 | return_ACPI_STATUS(AE_OK); |
490 | } | |
1da177e4 | 491 | |
b229cf92 BM |
492 | /* |
493 | * Flags == -1 means that _STA was not found. In this case, we assume that | |
494 | * the device is both present and functional. | |
495 | * | |
496 | * From the ACPI spec, description of _STA: | |
497 | * | |
498 | * "If a device object (including the processor object) does not have an | |
499 | * _STA object, then OSPM assumes that all of the above bits are set (in | |
500 | * other words, the device is present, ..., and functioning)" | |
501 | */ | |
defba1d8 | 502 | if (flags != ACPI_UINT32_MAX) { |
4119532c | 503 | walk_info->num_STA++; |
defba1d8 | 504 | } |
1da177e4 | 505 | |
b229cf92 BM |
506 | /* |
507 | * Examine the PRESENT and FUNCTIONING status bits | |
508 | * | |
509 | * Note: ACPI spec does not seem to specify behavior for the present but | |
510 | * not functioning case, so we assume functioning if present. | |
511 | */ | |
defba1d8 | 512 | if (!(flags & ACPI_STA_DEVICE_PRESENT)) { |
52fc0b02 | 513 | |
b229cf92 BM |
514 | /* Device is not present, we must examine the Functioning bit */ |
515 | ||
516 | if (flags & ACPI_STA_DEVICE_FUNCTIONING) { | |
517 | /* | |
518 | * Device is not present but is "functioning". In this case, | |
519 | * we will not run _INI, but we continue to examine the children | |
520 | * of this device. | |
521 | * | |
522 | * From the ACPI spec, description of _STA: (Note - no mention | |
523 | * of whether to run _INI or not on the device in question) | |
524 | * | |
525 | * "_STA may return bit 0 clear (not present) with bit 3 set | |
526 | * (device is functional). This case is used to indicate a valid | |
527 | * device for which no device driver should be loaded (for example, | |
528 | * a bridge device.) Children of this device may be present and | |
529 | * valid. OSPM should continue enumeration below a device whose | |
530 | * _STA returns this bit combination" | |
531 | */ | |
532 | return_ACPI_STATUS(AE_OK); | |
533 | } else { | |
534 | /* | |
535 | * Device is not present and is not functioning. We must abort the | |
536 | * walk of this subtree immediately -- don't look at the children | |
537 | * of such a device. | |
538 | * | |
539 | * From the ACPI spec, description of _INI: | |
540 | * | |
541 | * "If the _STA method indicates that the device is not present, | |
542 | * OSPM will not run the _INI and will not examine the children | |
543 | * of the device for _INI methods" | |
544 | */ | |
545 | return_ACPI_STATUS(AE_CTRL_DEPTH); | |
546 | } | |
1da177e4 LT |
547 | } |
548 | ||
549 | /* | |
b229cf92 BM |
550 | * The device is present or is assumed present if no _STA exists. |
551 | * Run the _INI if it exists (not required to exist) | |
552 | * | |
553 | * Note: We know there is an _INI within this subtree, but it may not be | |
554 | * under this particular device, it may be lower in the branch. | |
1da177e4 | 555 | */ |
b229cf92 BM |
556 | ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname |
557 | (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI)); | |
1da177e4 | 558 | |
4119532c BM |
559 | info->prefix_node = device_node; |
560 | info->pathname = METHOD_NAME__INI; | |
561 | info->parameters = NULL; | |
4119532c | 562 | info->flags = ACPI_IGNORE_RETURN_VALUE; |
1da177e4 | 563 | |
5d0e600d IM |
564 | /* |
565 | * Some hardware relies on this being executed as atomically | |
566 | * as possible (without an NMI being received in the middle of | |
567 | * this) - so disable NMIs and initialize the device: | |
568 | */ | |
569 | acpi_nmi_disable(); | |
4119532c | 570 | status = acpi_ns_evaluate(info); |
5d0e600d IM |
571 | acpi_nmi_enable(); |
572 | ||
b229cf92 | 573 | if (ACPI_SUCCESS(status)) { |
4119532c | 574 | walk_info->num_INI++; |
1da177e4 | 575 | |
b229cf92 BM |
576 | if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) && |
577 | (!(acpi_dbg_level & ACPI_LV_INFO))) { | |
578 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, ".")); | |
579 | } | |
1da177e4 | 580 | } |
b229cf92 BM |
581 | #ifdef ACPI_DEBUG_OUTPUT |
582 | else if (status != AE_NOT_FOUND) { | |
1da177e4 | 583 | |
b229cf92 BM |
584 | /* Ignore error and move on to next device */ |
585 | ||
4119532c BM |
586 | char *scope_name = |
587 | acpi_ns_get_external_pathname(info->resolved_node); | |
52fc0b02 | 588 | |
b229cf92 BM |
589 | ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution", |
590 | scope_name)); | |
591 | ACPI_FREE(scope_name); | |
592 | } | |
593 | #endif | |
1da177e4 | 594 | |
4c90ece2 BM |
595 | /* Ignore errors from above */ |
596 | ||
597 | status = AE_OK; | |
598 | ||
4119532c BM |
599 | /* |
600 | * The _INI method has been run if present; call the Global Initialization | |
601 | * Handler for this device. | |
602 | */ | |
b229cf92 | 603 | if (acpi_gbl_init_handler) { |
4be44fcd | 604 | status = |
4119532c | 605 | acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI); |
1da177e4 LT |
606 | } |
607 | ||
4119532c | 608 | return_ACPI_STATUS(status); |
1da177e4 | 609 | } |