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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: nsinit - namespace initialization | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
b4e104ea | 8 | * Copyright (C) 2000 - 2011, 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 | 98 | status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, |
2263576c | 99 | ACPI_UINT32_MAX, acpi_ns_init_one_object, NULL, |
4be44fcd LB |
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, |
96b7b7ad AS |
106 | "\nInitialized %u/%u Regions %u/%u Fields %u/%u " |
107 | "Buffers %u/%u Packages (%u 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 | 114 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
96b7b7ad | 115 | "%u Control Methods found\n", info.method_count)); |
4be44fcd | 116 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
96b7b7ad | 117 | "%u 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, | |
2263576c LM |
159 | acpi_ns_find_ini_methods, NULL, &info, |
160 | NULL); | |
4be44fcd | 161 | if (ACPI_FAILURE(status)) { |
4119532c BM |
162 | goto error_exit; |
163 | } | |
164 | ||
165 | /* Allocate the evaluation information block */ | |
166 | ||
167 | info.evaluate_info = | |
168 | ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
169 | if (!info.evaluate_info) { | |
170 | status = AE_NO_MEMORY; | |
171 | goto error_exit; | |
1da177e4 LT |
172 | } |
173 | ||
9e64155e BM |
174 | /* |
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. | |
178 | */ | |
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; | |
183 | ||
184 | status = acpi_ns_evaluate(info.evaluate_info); | |
185 | if (ACPI_SUCCESS(status)) { | |
186 | info.num_INI++; | |
187 | } | |
188 | ||
b229cf92 | 189 | /* Walk namespace to execute all _INIs on present devices */ |
1da177e4 | 190 | |
4be44fcd | 191 | status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, |
b229cf92 | 192 | ACPI_UINT32_MAX, FALSE, |
2263576c LM |
193 | acpi_ns_init_one_device, NULL, &info, |
194 | NULL); | |
4119532c | 195 | |
b681f7d9 MG |
196 | /* |
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. | |
200 | */ | |
201 | if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) { | |
202 | acpi_gbl_truncate_io_addresses = TRUE; | |
203 | } | |
204 | ||
4119532c | 205 | ACPI_FREE(info.evaluate_info); |
4be44fcd | 206 | if (ACPI_FAILURE(status)) { |
4119532c | 207 | goto error_exit; |
1da177e4 LT |
208 | } |
209 | ||
4be44fcd | 210 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, |
5821f754 BM |
211 | "\nExecuted %u _INI methods requiring %u _STA executions " |
212 | "(examined %u objects)\n", | |
b229cf92 | 213 | info.num_INI, info.num_STA, info.device_count)); |
1da177e4 | 214 | |
4be44fcd | 215 | return_ACPI_STATUS(status); |
4119532c BM |
216 | |
217 | error_exit: | |
218 | ACPI_EXCEPTION((AE_INFO, status, "During device initialization")); | |
219 | return_ACPI_STATUS(status); | |
1da177e4 LT |
220 | } |
221 | ||
1da177e4 LT |
222 | /******************************************************************************* |
223 | * | |
224 | * FUNCTION: acpi_ns_init_one_object | |
225 | * | |
226 | * PARAMETERS: obj_handle - Node | |
227 | * Level - Current nesting level | |
228 | * Context - Points to a init info struct | |
229 | * return_value - Not used | |
230 | * | |
231 | * RETURN: Status | |
232 | * | |
233 | * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object | |
234 | * within the namespace. | |
235 | * | |
236 | * Currently, the only objects that require initialization are: | |
237 | * 1) Methods | |
238 | * 2) Op Regions | |
239 | * | |
240 | ******************************************************************************/ | |
241 | ||
44f6c012 | 242 | static acpi_status |
4be44fcd LB |
243 | acpi_ns_init_one_object(acpi_handle obj_handle, |
244 | u32 level, void *context, void **return_value) | |
1da177e4 | 245 | { |
4be44fcd | 246 | acpi_object_type type; |
4d2acd9e | 247 | acpi_status status = AE_OK; |
4be44fcd LB |
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; | |
1da177e4 | 253 | |
b229cf92 | 254 | ACPI_FUNCTION_NAME(ns_init_one_object); |
1da177e4 LT |
255 | |
256 | info->object_count++; | |
257 | ||
258 | /* And even then, we are only interested in a few object types */ | |
259 | ||
4be44fcd LB |
260 | type = acpi_ns_get_type(obj_handle); |
261 | obj_desc = acpi_ns_get_attached_object(node); | |
1da177e4 LT |
262 | if (!obj_desc) { |
263 | return (AE_OK); | |
264 | } | |
265 | ||
266 | /* Increment counters for object types we are looking for */ | |
267 | ||
268 | switch (type) { | |
269 | case ACPI_TYPE_REGION: | |
270 | info->op_region_count++; | |
271 | break; | |
272 | ||
273 | case ACPI_TYPE_BUFFER_FIELD: | |
274 | info->field_count++; | |
275 | break; | |
276 | ||
ef805d95 LM |
277 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
278 | info->field_count++; | |
279 | break; | |
280 | ||
1da177e4 LT |
281 | case ACPI_TYPE_BUFFER: |
282 | info->buffer_count++; | |
283 | break; | |
284 | ||
285 | case ACPI_TYPE_PACKAGE: | |
286 | info->package_count++; | |
287 | break; | |
288 | ||
289 | default: | |
290 | ||
291 | /* No init required, just exit now */ | |
292 | return (AE_OK); | |
293 | } | |
294 | ||
d4913dc6 BM |
295 | /* If the object is already initialized, nothing else to do */ |
296 | ||
1da177e4 LT |
297 | if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { |
298 | return (AE_OK); | |
299 | } | |
300 | ||
d4913dc6 BM |
301 | /* Must lock the interpreter before executing AML code */ |
302 | ||
4d2acd9e | 303 | acpi_ex_enter_interpreter(); |
1da177e4 LT |
304 | |
305 | /* | |
306 | * Each of these types can contain executable AML code within the | |
307 | * declaration. | |
308 | */ | |
309 | switch (type) { | |
310 | case ACPI_TYPE_REGION: | |
311 | ||
312 | info->op_region_init++; | |
4be44fcd | 313 | status = acpi_ds_get_region_arguments(obj_desc); |
1da177e4 LT |
314 | break; |
315 | ||
316 | case ACPI_TYPE_BUFFER_FIELD: | |
317 | ||
318 | info->field_init++; | |
4be44fcd | 319 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
1da177e4 LT |
320 | break; |
321 | ||
ef805d95 LM |
322 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
323 | ||
324 | info->field_init++; | |
325 | status = acpi_ds_get_bank_field_arguments(obj_desc); | |
326 | break; | |
327 | ||
1da177e4 LT |
328 | case ACPI_TYPE_BUFFER: |
329 | ||
330 | info->buffer_init++; | |
4be44fcd | 331 | status = acpi_ds_get_buffer_arguments(obj_desc); |
1da177e4 LT |
332 | break; |
333 | ||
334 | case ACPI_TYPE_PACKAGE: | |
335 | ||
336 | info->package_init++; | |
4be44fcd | 337 | status = acpi_ds_get_package_arguments(obj_desc); |
1da177e4 LT |
338 | break; |
339 | ||
340 | default: | |
341 | /* No other types can get here */ | |
342 | break; | |
343 | } | |
344 | ||
4be44fcd | 345 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
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))); | |
1da177e4 LT |
350 | } |
351 | ||
352 | /* | |
353 | * Print a dot for each object unless we are going to print the entire | |
354 | * pathname | |
355 | */ | |
356 | if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) { | |
4be44fcd | 357 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, ".")); |
1da177e4 LT |
358 | } |
359 | ||
360 | /* | |
361 | * We ignore errors from above, and always return OK, since we don't want | |
362 | * to abort the walk on any single error. | |
363 | */ | |
4be44fcd | 364 | acpi_ex_exit_interpreter(); |
1da177e4 LT |
365 | return (AE_OK); |
366 | } | |
367 | ||
b229cf92 BM |
368 | /******************************************************************************* |
369 | * | |
370 | * FUNCTION: acpi_ns_find_ini_methods | |
371 | * | |
372 | * PARAMETERS: acpi_walk_callback | |
373 | * | |
374 | * RETURN: acpi_status | |
375 | * | |
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. | |
381 | * | |
382 | ******************************************************************************/ | |
383 | ||
384 | static acpi_status | |
385 | acpi_ns_find_ini_methods(acpi_handle obj_handle, | |
386 | u32 nesting_level, void *context, void **return_value) | |
387 | { | |
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; | |
392 | ||
393 | /* Keep count of device/processor/thermal objects */ | |
394 | ||
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++; | |
400 | return (AE_OK); | |
401 | } | |
402 | ||
403 | /* We are only looking for methods named _INI */ | |
404 | ||
405 | if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) { | |
406 | return (AE_OK); | |
407 | } | |
408 | ||
409 | /* | |
410 | * The only _INI methods that we care about are those that are | |
411 | * present under Device, Processor, and Thermal objects. | |
412 | */ | |
c45b5c09 | 413 | parent_node = node->parent; |
b229cf92 BM |
414 | switch (parent_node->type) { |
415 | case ACPI_TYPE_DEVICE: | |
416 | case ACPI_TYPE_PROCESSOR: | |
417 | case ACPI_TYPE_THERMAL: | |
418 | ||
419 | /* Mark parent and bubble up the INI present flag to the root */ | |
420 | ||
421 | while (parent_node) { | |
422 | parent_node->flags |= ANOBJ_SUBTREE_HAS_INI; | |
c45b5c09 | 423 | parent_node = parent_node->parent; |
b229cf92 BM |
424 | } |
425 | break; | |
426 | ||
427 | default: | |
428 | break; | |
429 | } | |
430 | ||
431 | return (AE_OK); | |
432 | } | |
433 | ||
1da177e4 LT |
434 | /******************************************************************************* |
435 | * | |
436 | * FUNCTION: acpi_ns_init_one_device | |
437 | * | |
438 | * PARAMETERS: acpi_walk_callback | |
439 | * | |
440 | * RETURN: acpi_status | |
441 | * | |
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. | |
445 | * | |
446 | ******************************************************************************/ | |
447 | ||
44f6c012 | 448 | static acpi_status |
4be44fcd LB |
449 | acpi_ns_init_one_device(acpi_handle obj_handle, |
450 | u32 nesting_level, void *context, void **return_value) | |
1da177e4 | 451 | { |
4119532c | 452 | struct acpi_device_walk_info *walk_info = |
b229cf92 | 453 | ACPI_CAST_PTR(struct acpi_device_walk_info, context); |
4119532c | 454 | struct acpi_evaluate_info *info = walk_info->evaluate_info; |
4be44fcd LB |
455 | u32 flags; |
456 | acpi_status status; | |
defba1d8 | 457 | struct acpi_namespace_node *device_node; |
1da177e4 | 458 | |
b229cf92 | 459 | ACPI_FUNCTION_TRACE(ns_init_one_device); |
1da177e4 | 460 | |
b229cf92 | 461 | /* We are interested in Devices, Processors and thermal_zones only */ |
1da177e4 | 462 | |
b229cf92 | 463 | device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); |
defba1d8 BM |
464 | if ((device_node->type != ACPI_TYPE_DEVICE) && |
465 | (device_node->type != ACPI_TYPE_PROCESSOR) && | |
466 | (device_node->type != ACPI_TYPE_THERMAL)) { | |
4be44fcd | 467 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
468 | } |
469 | ||
1da177e4 | 470 | /* |
b229cf92 BM |
471 | * Because of an earlier namespace analysis, all subtrees that contain an |
472 | * _INI method are tagged. | |
473 | * | |
474 | * If this device subtree does not contain any _INI methods, we | |
475 | * can exit now and stop traversing this entire subtree. | |
defba1d8 | 476 | */ |
b229cf92 BM |
477 | if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) { |
478 | return_ACPI_STATUS(AE_CTRL_DEPTH); | |
defba1d8 BM |
479 | } |
480 | ||
481 | /* | |
b229cf92 BM |
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): | |
484 | * | |
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) | |
488 | * | |
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. | |
1da177e4 | 491 | */ |
b229cf92 BM |
492 | ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname |
493 | (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA)); | |
1da177e4 | 494 | |
b229cf92 | 495 | status = acpi_ut_execute_STA(device_node, &flags); |
4be44fcd | 496 | if (ACPI_FAILURE(status)) { |
52fc0b02 | 497 | |
defba1d8 | 498 | /* Ignore error and move on to next device */ |
1da177e4 | 499 | |
defba1d8 BM |
500 | return_ACPI_STATUS(AE_OK); |
501 | } | |
1da177e4 | 502 | |
b229cf92 BM |
503 | /* |
504 | * Flags == -1 means that _STA was not found. In this case, we assume that | |
505 | * the device is both present and functional. | |
506 | * | |
507 | * From the ACPI spec, description of _STA: | |
508 | * | |
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)" | |
512 | */ | |
defba1d8 | 513 | if (flags != ACPI_UINT32_MAX) { |
4119532c | 514 | walk_info->num_STA++; |
defba1d8 | 515 | } |
1da177e4 | 516 | |
b229cf92 BM |
517 | /* |
518 | * Examine the PRESENT and FUNCTIONING status bits | |
519 | * | |
520 | * Note: ACPI spec does not seem to specify behavior for the present but | |
521 | * not functioning case, so we assume functioning if present. | |
522 | */ | |
defba1d8 | 523 | if (!(flags & ACPI_STA_DEVICE_PRESENT)) { |
52fc0b02 | 524 | |
b229cf92 BM |
525 | /* Device is not present, we must examine the Functioning bit */ |
526 | ||
527 | if (flags & ACPI_STA_DEVICE_FUNCTIONING) { | |
528 | /* | |
529 | * Device is not present but is "functioning". In this case, | |
530 | * we will not run _INI, but we continue to examine the children | |
531 | * of this device. | |
532 | * | |
533 | * From the ACPI spec, description of _STA: (Note - no mention | |
534 | * of whether to run _INI or not on the device in question) | |
535 | * | |
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" | |
542 | */ | |
543 | return_ACPI_STATUS(AE_OK); | |
544 | } else { | |
545 | /* | |
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 | |
548 | * of such a device. | |
549 | * | |
550 | * From the ACPI spec, description of _INI: | |
551 | * | |
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" | |
555 | */ | |
556 | return_ACPI_STATUS(AE_CTRL_DEPTH); | |
557 | } | |
1da177e4 LT |
558 | } |
559 | ||
560 | /* | |
b229cf92 BM |
561 | * The device is present or is assumed present if no _STA exists. |
562 | * Run the _INI if it exists (not required to exist) | |
563 | * | |
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. | |
1da177e4 | 566 | */ |
b229cf92 BM |
567 | ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname |
568 | (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI)); | |
1da177e4 | 569 | |
4119532c BM |
570 | info->prefix_node = device_node; |
571 | info->pathname = METHOD_NAME__INI; | |
572 | info->parameters = NULL; | |
4119532c | 573 | info->flags = ACPI_IGNORE_RETURN_VALUE; |
1da177e4 | 574 | |
5d0e600d IM |
575 | /* |
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: | |
579 | */ | |
4119532c | 580 | status = acpi_ns_evaluate(info); |
5d0e600d | 581 | |
b229cf92 | 582 | if (ACPI_SUCCESS(status)) { |
4119532c | 583 | walk_info->num_INI++; |
1da177e4 | 584 | |
b229cf92 BM |
585 | if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) && |
586 | (!(acpi_dbg_level & ACPI_LV_INFO))) { | |
587 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, ".")); | |
588 | } | |
1da177e4 | 589 | } |
b229cf92 BM |
590 | #ifdef ACPI_DEBUG_OUTPUT |
591 | else if (status != AE_NOT_FOUND) { | |
1da177e4 | 592 | |
b229cf92 BM |
593 | /* Ignore error and move on to next device */ |
594 | ||
4119532c BM |
595 | char *scope_name = |
596 | acpi_ns_get_external_pathname(info->resolved_node); | |
52fc0b02 | 597 | |
b229cf92 BM |
598 | ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution", |
599 | scope_name)); | |
600 | ACPI_FREE(scope_name); | |
601 | } | |
602 | #endif | |
1da177e4 | 603 | |
4c90ece2 BM |
604 | /* Ignore errors from above */ |
605 | ||
606 | status = AE_OK; | |
607 | ||
4119532c BM |
608 | /* |
609 | * The _INI method has been run if present; call the Global Initialization | |
610 | * Handler for this device. | |
611 | */ | |
b229cf92 | 612 | if (acpi_gbl_init_handler) { |
4be44fcd | 613 | status = |
4119532c | 614 | acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI); |
1da177e4 LT |
615 | } |
616 | ||
4119532c | 617 | return_ACPI_STATUS(status); |
1da177e4 | 618 | } |