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1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evgpeinit - System GPE initialization and update | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2010, Intel Corp. | |
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 | ||
44 | #include <acpi/acpi.h> | |
45 | #include "accommon.h" | |
46 | #include "acevents.h" | |
47 | #include "acnamesp.h" | |
48 | #include "acinterp.h" | |
49 | ||
50 | #define _COMPONENT ACPI_EVENTS | |
51 | ACPI_MODULE_NAME("evgpeinit") | |
52 | ||
53 | /******************************************************************************* | |
54 | * | |
55 | * FUNCTION: acpi_ev_gpe_initialize | |
56 | * | |
57 | * PARAMETERS: None | |
58 | * | |
59 | * RETURN: Status | |
60 | * | |
61 | * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks | |
62 | * | |
63 | ******************************************************************************/ | |
64 | acpi_status acpi_ev_gpe_initialize(void) | |
65 | { | |
66 | u32 register_count0 = 0; | |
67 | u32 register_count1 = 0; | |
68 | u32 gpe_number_max = 0; | |
69 | acpi_status status; | |
70 | ||
71 | ACPI_FUNCTION_TRACE(ev_gpe_initialize); | |
72 | ||
73 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); | |
74 | if (ACPI_FAILURE(status)) { | |
75 | return_ACPI_STATUS(status); | |
76 | } | |
77 | ||
78 | /* | |
79 | * Initialize the GPE Block(s) defined in the FADT | |
80 | * | |
81 | * Why the GPE register block lengths are divided by 2: From the ACPI | |
82 | * Spec, section "General-Purpose Event Registers", we have: | |
83 | * | |
84 | * "Each register block contains two registers of equal length | |
85 | * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the | |
86 | * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN | |
87 | * The length of the GPE1_STS and GPE1_EN registers is equal to | |
88 | * half the GPE1_LEN. If a generic register block is not supported | |
89 | * then its respective block pointer and block length values in the | |
90 | * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need | |
91 | * to be the same size." | |
92 | */ | |
93 | ||
94 | /* | |
95 | * Determine the maximum GPE number for this machine. | |
96 | * | |
97 | * Note: both GPE0 and GPE1 are optional, and either can exist without | |
98 | * the other. | |
99 | * | |
100 | * If EITHER the register length OR the block address are zero, then that | |
101 | * particular block is not supported. | |
102 | */ | |
103 | if (acpi_gbl_FADT.gpe0_block_length && | |
104 | acpi_gbl_FADT.xgpe0_block.address) { | |
105 | ||
106 | /* GPE block 0 exists (has both length and address > 0) */ | |
107 | ||
108 | register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2); | |
109 | ||
110 | gpe_number_max = | |
111 | (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1; | |
112 | ||
113 | /* Install GPE Block 0 */ | |
114 | ||
115 | status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device, | |
116 | &acpi_gbl_FADT.xgpe0_block, | |
117 | register_count0, 0, | |
118 | acpi_gbl_FADT.sci_interrupt, | |
119 | &acpi_gbl_gpe_fadt_blocks[0]); | |
120 | ||
121 | if (ACPI_FAILURE(status)) { | |
122 | ACPI_EXCEPTION((AE_INFO, status, | |
123 | "Could not create GPE Block 0")); | |
124 | } | |
125 | } | |
126 | ||
127 | if (acpi_gbl_FADT.gpe1_block_length && | |
128 | acpi_gbl_FADT.xgpe1_block.address) { | |
129 | ||
130 | /* GPE block 1 exists (has both length and address > 0) */ | |
131 | ||
132 | register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2); | |
133 | ||
134 | /* Check for GPE0/GPE1 overlap (if both banks exist) */ | |
135 | ||
136 | if ((register_count0) && | |
137 | (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) { | |
138 | ACPI_ERROR((AE_INFO, | |
139 | "GPE0 block (GPE 0 to %u) overlaps the GPE1 block " | |
140 | "(GPE %u to %u) - Ignoring GPE1", | |
141 | gpe_number_max, acpi_gbl_FADT.gpe1_base, | |
142 | acpi_gbl_FADT.gpe1_base + | |
143 | ((register_count1 * | |
144 | ACPI_GPE_REGISTER_WIDTH) - 1))); | |
145 | ||
146 | /* Ignore GPE1 block by setting the register count to zero */ | |
147 | ||
148 | register_count1 = 0; | |
149 | } else { | |
150 | /* Install GPE Block 1 */ | |
151 | ||
152 | status = | |
153 | acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device, | |
154 | &acpi_gbl_FADT.xgpe1_block, | |
155 | register_count1, | |
156 | acpi_gbl_FADT.gpe1_base, | |
157 | acpi_gbl_FADT. | |
158 | sci_interrupt, | |
159 | &acpi_gbl_gpe_fadt_blocks | |
160 | [1]); | |
161 | ||
162 | if (ACPI_FAILURE(status)) { | |
163 | ACPI_EXCEPTION((AE_INFO, status, | |
164 | "Could not create GPE Block 1")); | |
165 | } | |
166 | ||
167 | /* | |
168 | * GPE0 and GPE1 do not have to be contiguous in the GPE number | |
169 | * space. However, GPE0 always starts at GPE number zero. | |
170 | */ | |
171 | gpe_number_max = acpi_gbl_FADT.gpe1_base + | |
172 | ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1); | |
173 | } | |
174 | } | |
175 | ||
176 | /* Exit if there are no GPE registers */ | |
177 | ||
178 | if ((register_count0 + register_count1) == 0) { | |
179 | ||
180 | /* GPEs are not required by ACPI, this is OK */ | |
181 | ||
182 | ACPI_DEBUG_PRINT((ACPI_DB_INIT, | |
183 | "There are no GPE blocks defined in the FADT\n")); | |
184 | status = AE_OK; | |
185 | goto cleanup; | |
186 | } | |
187 | ||
188 | /* Check for Max GPE number out-of-range */ | |
189 | ||
190 | if (gpe_number_max > ACPI_GPE_MAX) { | |
191 | ACPI_ERROR((AE_INFO, | |
192 | "Maximum GPE number from FADT is too large: 0x%X", | |
193 | gpe_number_max)); | |
194 | status = AE_BAD_VALUE; | |
195 | goto cleanup; | |
196 | } | |
197 | ||
198 | cleanup: | |
199 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
200 | return_ACPI_STATUS(AE_OK); | |
201 | } | |
202 | ||
203 | /******************************************************************************* | |
204 | * | |
205 | * FUNCTION: acpi_ev_update_gpes | |
206 | * | |
207 | * PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table | |
208 | * | |
209 | * RETURN: None | |
210 | * | |
211 | * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a | |
212 | * result of a Load() or load_table() operation. If new GPE | |
213 | * methods have been installed, register the new methods and | |
214 | * enable and runtime GPEs that are associated with them. Also, | |
215 | * run any newly loaded _PRW methods in order to discover any | |
216 | * new CAN_WAKE GPEs. | |
217 | * | |
218 | ******************************************************************************/ | |
219 | ||
220 | void acpi_ev_update_gpes(acpi_owner_id table_owner_id) | |
221 | { | |
222 | struct acpi_gpe_xrupt_info *gpe_xrupt_info; | |
223 | struct acpi_gpe_block_info *gpe_block; | |
224 | struct acpi_gpe_walk_info walk_info; | |
225 | acpi_status status = AE_OK; | |
226 | u32 new_wake_gpe_count = 0; | |
227 | ||
228 | /* We will examine only _PRW/_Lxx/_Exx methods owned by this table */ | |
229 | ||
230 | walk_info.owner_id = table_owner_id; | |
231 | walk_info.execute_by_owner_id = TRUE; | |
232 | walk_info.count = 0; | |
233 | ||
234 | if (acpi_gbl_leave_wake_gpes_disabled) { | |
235 | /* | |
236 | * 1) Run any newly-loaded _PRW methods to find any GPEs that | |
237 | * can now be marked as CAN_WAKE GPEs. Note: We must run the | |
238 | * _PRW methods before we process the _Lxx/_Exx methods because | |
239 | * we will enable all runtime GPEs associated with the new | |
240 | * _Lxx/_Exx methods at the time we process those methods. | |
241 | * | |
242 | * Unlock interpreter so that we can run the _PRW methods. | |
243 | */ | |
244 | walk_info.gpe_block = NULL; | |
245 | walk_info.gpe_device = NULL; | |
246 | ||
247 | acpi_ex_exit_interpreter(); | |
248 | ||
249 | status = | |
250 | acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
251 | ACPI_UINT32_MAX, | |
252 | ACPI_NS_WALK_NO_UNLOCK, | |
253 | acpi_ev_match_prw_and_gpe, NULL, | |
254 | &walk_info, NULL); | |
255 | if (ACPI_FAILURE(status)) { | |
256 | ACPI_EXCEPTION((AE_INFO, status, | |
257 | "While executing _PRW methods")); | |
258 | } | |
259 | ||
260 | acpi_ex_enter_interpreter(); | |
261 | new_wake_gpe_count = walk_info.count; | |
262 | } | |
263 | ||
264 | /* | |
265 | * 2) Find any _Lxx/_Exx GPE methods that have just been loaded. | |
266 | * | |
267 | * Any GPEs that correspond to new _Lxx/_Exx methods and are not | |
268 | * marked as CAN_WAKE are immediately enabled. | |
269 | * | |
270 | * Examine the namespace underneath each gpe_device within the | |
271 | * gpe_block lists. | |
272 | */ | |
273 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); | |
274 | if (ACPI_FAILURE(status)) { | |
275 | return; | |
276 | } | |
277 | ||
278 | walk_info.count = 0; | |
279 | walk_info.enable_this_gpe = TRUE; | |
280 | ||
281 | /* Walk the interrupt level descriptor list */ | |
282 | ||
283 | gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head; | |
284 | while (gpe_xrupt_info) { | |
285 | ||
286 | /* Walk all Gpe Blocks attached to this interrupt level */ | |
287 | ||
288 | gpe_block = gpe_xrupt_info->gpe_block_list_head; | |
289 | while (gpe_block) { | |
290 | walk_info.gpe_block = gpe_block; | |
291 | walk_info.gpe_device = gpe_block->node; | |
292 | ||
293 | status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, | |
294 | walk_info.gpe_device, | |
295 | ACPI_UINT32_MAX, | |
296 | ACPI_NS_WALK_NO_UNLOCK, | |
297 | acpi_ev_match_gpe_method, | |
298 | NULL, &walk_info, NULL); | |
299 | if (ACPI_FAILURE(status)) { | |
300 | ACPI_EXCEPTION((AE_INFO, status, | |
301 | "While decoding _Lxx/_Exx methods")); | |
302 | } | |
303 | ||
304 | gpe_block = gpe_block->next; | |
305 | } | |
306 | ||
307 | gpe_xrupt_info = gpe_xrupt_info->next; | |
308 | } | |
309 | ||
310 | if (walk_info.count || new_wake_gpe_count) { | |
311 | ACPI_INFO((AE_INFO, | |
312 | "Enabled %u new runtime GPEs, added %u new wakeup GPEs", | |
313 | walk_info.count, new_wake_gpe_count)); | |
314 | } | |
315 | ||
316 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
317 | return; | |
318 | } | |
319 | ||
320 | /******************************************************************************* | |
321 | * | |
322 | * FUNCTION: acpi_ev_match_gpe_method | |
323 | * | |
324 | * PARAMETERS: Callback from walk_namespace | |
325 | * | |
326 | * RETURN: Status | |
327 | * | |
328 | * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a | |
329 | * control method under the _GPE portion of the namespace. | |
330 | * Extract the name and GPE type from the object, saving this | |
331 | * information for quick lookup during GPE dispatch. Allows a | |
332 | * per-owner_id evaluation if execute_by_owner_id is TRUE in the | |
333 | * walk_info parameter block. | |
334 | * | |
335 | * The name of each GPE control method is of the form: | |
336 | * "_Lxx" or "_Exx", where: | |
337 | * L - means that the GPE is level triggered | |
338 | * E - means that the GPE is edge triggered | |
339 | * xx - is the GPE number [in HEX] | |
340 | * | |
341 | * If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods | |
342 | * with that owner. | |
343 | * If walk_info->enable_this_gpe is TRUE, the GPE that is referred to by a GPE | |
344 | * method is immediately enabled (Used for Load/load_table operators) | |
345 | * | |
346 | ******************************************************************************/ | |
347 | ||
348 | acpi_status | |
349 | acpi_ev_match_gpe_method(acpi_handle obj_handle, | |
350 | u32 level, void *context, void **return_value) | |
351 | { | |
352 | struct acpi_namespace_node *method_node = | |
353 | ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); | |
354 | struct acpi_gpe_walk_info *walk_info = | |
355 | ACPI_CAST_PTR(struct acpi_gpe_walk_info, context); | |
356 | struct acpi_gpe_event_info *gpe_event_info; | |
357 | struct acpi_namespace_node *gpe_device; | |
358 | acpi_status status; | |
359 | u32 gpe_number; | |
360 | char name[ACPI_NAME_SIZE + 1]; | |
361 | u8 type; | |
362 | ||
363 | ACPI_FUNCTION_TRACE(ev_match_gpe_method); | |
364 | ||
365 | /* Check if requested owner_id matches this owner_id */ | |
366 | ||
367 | if ((walk_info->execute_by_owner_id) && | |
368 | (method_node->owner_id != walk_info->owner_id)) { | |
369 | return_ACPI_STATUS(AE_OK); | |
370 | } | |
371 | ||
372 | /* | |
373 | * Match and decode the _Lxx and _Exx GPE method names | |
374 | * | |
375 | * 1) Extract the method name and null terminate it | |
376 | */ | |
377 | ACPI_MOVE_32_TO_32(name, &method_node->name.integer); | |
378 | name[ACPI_NAME_SIZE] = 0; | |
379 | ||
380 | /* 2) Name must begin with an underscore */ | |
381 | ||
382 | if (name[0] != '_') { | |
383 | return_ACPI_STATUS(AE_OK); /* Ignore this method */ | |
384 | } | |
385 | ||
386 | /* | |
387 | * 3) Edge/Level determination is based on the 2nd character | |
388 | * of the method name | |
389 | * | |
390 | * NOTE: Default GPE type is RUNTIME only. Later, if a _PRW object is | |
391 | * found that points to this GPE, the ACPI_GPE_CAN_WAKE flag is set. | |
392 | */ | |
393 | switch (name[1]) { | |
394 | case 'L': | |
395 | type = ACPI_GPE_LEVEL_TRIGGERED; | |
396 | break; | |
397 | ||
398 | case 'E': | |
399 | type = ACPI_GPE_EDGE_TRIGGERED; | |
400 | break; | |
401 | ||
402 | default: | |
403 | /* Unknown method type, just ignore it */ | |
404 | ||
405 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, | |
406 | "Ignoring unknown GPE method type: %s " | |
407 | "(name not of form _Lxx or _Exx)", name)); | |
408 | return_ACPI_STATUS(AE_OK); | |
409 | } | |
410 | ||
411 | /* 4) The last two characters of the name are the hex GPE Number */ | |
412 | ||
413 | gpe_number = ACPI_STRTOUL(&name[2], NULL, 16); | |
414 | if (gpe_number == ACPI_UINT32_MAX) { | |
415 | ||
416 | /* Conversion failed; invalid method, just ignore it */ | |
417 | ||
418 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, | |
419 | "Could not extract GPE number from name: %s " | |
420 | "(name is not of form _Lxx or _Exx)", name)); | |
421 | return_ACPI_STATUS(AE_OK); | |
422 | } | |
423 | ||
424 | /* Ensure that we have a valid GPE number for this GPE block */ | |
425 | ||
426 | gpe_event_info = | |
427 | acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block); | |
428 | if (!gpe_event_info) { | |
429 | /* | |
430 | * This gpe_number is not valid for this GPE block, just ignore it. | |
431 | * However, it may be valid for a different GPE block, since GPE0 | |
432 | * and GPE1 methods both appear under \_GPE. | |
433 | */ | |
434 | return_ACPI_STATUS(AE_OK); | |
435 | } | |
436 | ||
437 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == | |
438 | ACPI_GPE_DISPATCH_HANDLER) { | |
439 | ||
440 | /* If there is already a handler, ignore this GPE method */ | |
441 | ||
442 | return_ACPI_STATUS(AE_OK); | |
443 | } | |
444 | ||
445 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == | |
446 | ACPI_GPE_DISPATCH_METHOD) { | |
447 | /* | |
448 | * If there is already a method, ignore this method. But check | |
449 | * for a type mismatch (if both the _Lxx AND _Exx exist) | |
450 | */ | |
451 | if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) { | |
452 | ACPI_ERROR((AE_INFO, | |
453 | "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods", | |
454 | gpe_number, gpe_number, gpe_number)); | |
455 | } | |
456 | return_ACPI_STATUS(AE_OK); | |
457 | } | |
458 | ||
459 | /* | |
460 | * Add the GPE information from above to the gpe_event_info block for | |
461 | * use during dispatch of this GPE. | |
462 | */ | |
463 | gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD); | |
464 | gpe_event_info->dispatch.method_node = method_node; | |
465 | ||
466 | /* | |
467 | * Enable this GPE if requested. This only happens when during the | |
468 | * execution of a Load or load_table operator. We have found a new | |
469 | * GPE method and want to immediately enable the GPE if it is a | |
470 | * runtime GPE. | |
471 | */ | |
472 | if (walk_info->enable_this_gpe) { | |
473 | ||
474 | /* Ignore GPEs that can wake the system */ | |
475 | ||
476 | if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE) || | |
477 | !acpi_gbl_leave_wake_gpes_disabled) { | |
478 | walk_info->count++; | |
479 | gpe_device = walk_info->gpe_device; | |
480 | ||
481 | if (gpe_device == acpi_gbl_fadt_gpe_device) { | |
482 | gpe_device = NULL; | |
483 | } | |
484 | ||
485 | status = acpi_enable_gpe(gpe_device, gpe_number, | |
486 | ACPI_GPE_TYPE_RUNTIME); | |
487 | if (ACPI_FAILURE(status)) { | |
488 | ACPI_EXCEPTION((AE_INFO, status, | |
489 | "Could not enable GPE 0x%02X", | |
490 | gpe_number)); | |
491 | } | |
492 | } | |
493 | } | |
494 | ||
495 | ACPI_DEBUG_PRINT((ACPI_DB_LOAD, | |
496 | "Registered GPE method %s as GPE number 0x%.2X\n", | |
497 | name, gpe_number)); | |
498 | return_ACPI_STATUS(AE_OK); | |
499 | } | |
500 | ||
501 | /******************************************************************************* | |
502 | * | |
503 | * FUNCTION: acpi_ev_match_prw_and_gpe | |
504 | * | |
505 | * PARAMETERS: Callback from walk_namespace | |
506 | * | |
507 | * RETURN: Status. NOTE: We ignore errors so that the _PRW walk is | |
508 | * not aborted on a single _PRW failure. | |
509 | * | |
510 | * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a | |
511 | * Device. Run the _PRW method. If present, extract the GPE | |
512 | * number and mark the GPE as a CAN_WAKE GPE. Allows a | |
513 | * per-owner_id execution if execute_by_owner_id is TRUE in the | |
514 | * walk_info parameter block. | |
515 | * | |
516 | * If walk_info->execute_by_owner_id is TRUE, we only execute _PRWs with that | |
517 | * owner. | |
518 | * If walk_info->gpe_device is NULL, we execute every _PRW found. Otherwise, | |
519 | * we only execute _PRWs that refer to the input gpe_device. | |
520 | * | |
521 | ******************************************************************************/ | |
522 | ||
523 | acpi_status | |
524 | acpi_ev_match_prw_and_gpe(acpi_handle obj_handle, | |
525 | u32 level, void *context, void **return_value) | |
526 | { | |
527 | struct acpi_gpe_walk_info *walk_info = | |
528 | ACPI_CAST_PTR(struct acpi_gpe_walk_info, context); | |
529 | struct acpi_namespace_node *gpe_device; | |
530 | struct acpi_gpe_block_info *gpe_block; | |
531 | struct acpi_namespace_node *target_gpe_device; | |
532 | struct acpi_namespace_node *prw_node; | |
533 | struct acpi_gpe_event_info *gpe_event_info; | |
534 | union acpi_operand_object *pkg_desc; | |
535 | union acpi_operand_object *obj_desc; | |
536 | u32 gpe_number; | |
537 | acpi_status status; | |
538 | ||
539 | ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe); | |
540 | ||
541 | /* Check for a _PRW method under this device */ | |
542 | ||
543 | status = acpi_ns_get_node(obj_handle, METHOD_NAME__PRW, | |
544 | ACPI_NS_NO_UPSEARCH, &prw_node); | |
545 | if (ACPI_FAILURE(status)) { | |
546 | return_ACPI_STATUS(AE_OK); | |
547 | } | |
548 | ||
549 | /* Check if requested owner_id matches this owner_id */ | |
550 | ||
551 | if ((walk_info->execute_by_owner_id) && | |
552 | (prw_node->owner_id != walk_info->owner_id)) { | |
553 | return_ACPI_STATUS(AE_OK); | |
554 | } | |
555 | ||
556 | /* Execute the _PRW */ | |
557 | ||
558 | status = acpi_ut_evaluate_object(prw_node, NULL, | |
559 | ACPI_BTYPE_PACKAGE, &pkg_desc); | |
560 | if (ACPI_FAILURE(status)) { | |
561 | return_ACPI_STATUS(AE_OK); | |
562 | } | |
563 | ||
564 | /* The returned _PRW package must have at least two elements */ | |
565 | ||
566 | if (pkg_desc->package.count < 2) { | |
567 | goto cleanup; | |
568 | } | |
569 | ||
570 | /* Extract pointers from the input context */ | |
571 | ||
572 | gpe_device = walk_info->gpe_device; | |
573 | gpe_block = walk_info->gpe_block; | |
574 | ||
575 | /* | |
576 | * The _PRW object must return a package, we are only interested | |
577 | * in the first element | |
578 | */ | |
579 | obj_desc = pkg_desc->package.elements[0]; | |
580 | ||
581 | if (obj_desc->common.type == ACPI_TYPE_INTEGER) { | |
582 | ||
583 | /* Use FADT-defined GPE device (from definition of _PRW) */ | |
584 | ||
585 | target_gpe_device = NULL; | |
586 | if (gpe_device) { | |
587 | target_gpe_device = acpi_gbl_fadt_gpe_device; | |
588 | } | |
589 | ||
590 | /* Integer is the GPE number in the FADT described GPE blocks */ | |
591 | ||
592 | gpe_number = (u32)obj_desc->integer.value; | |
593 | } else if (obj_desc->common.type == ACPI_TYPE_PACKAGE) { | |
594 | ||
595 | /* Package contains a GPE reference and GPE number within a GPE block */ | |
596 | ||
597 | if ((obj_desc->package.count < 2) || | |
598 | ((obj_desc->package.elements[0])->common.type != | |
599 | ACPI_TYPE_LOCAL_REFERENCE) || | |
600 | ((obj_desc->package.elements[1])->common.type != | |
601 | ACPI_TYPE_INTEGER)) { | |
602 | goto cleanup; | |
603 | } | |
604 | ||
605 | /* Get GPE block reference and decode */ | |
606 | ||
607 | target_gpe_device = | |
608 | obj_desc->package.elements[0]->reference.node; | |
609 | gpe_number = (u32)obj_desc->package.elements[1]->integer.value; | |
610 | } else { | |
611 | /* Unknown type, just ignore it */ | |
612 | ||
613 | goto cleanup; | |
614 | } | |
615 | ||
616 | /* Get the gpe_event_info for this GPE */ | |
617 | ||
618 | if (gpe_device) { | |
619 | /* | |
620 | * Is this GPE within this block? | |
621 | * | |
622 | * TRUE if and only if these conditions are true: | |
623 | * 1) The GPE devices match. | |
624 | * 2) The GPE index(number) is within the range of the Gpe Block | |
625 | * associated with the GPE device. | |
626 | */ | |
627 | if (gpe_device != target_gpe_device) { | |
628 | goto cleanup; | |
629 | } | |
630 | ||
631 | gpe_event_info = | |
632 | acpi_ev_low_get_gpe_info(gpe_number, gpe_block); | |
633 | } else { | |
634 | /* gpe_device is NULL, just match the target_device and gpe_number */ | |
635 | ||
636 | gpe_event_info = | |
637 | acpi_ev_get_gpe_event_info(target_gpe_device, gpe_number); | |
638 | } | |
639 | ||
640 | if (gpe_event_info) { | |
641 | if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) { | |
642 | ||
643 | /* This GPE can wake the system */ | |
644 | ||
645 | gpe_event_info->flags |= ACPI_GPE_CAN_WAKE; | |
646 | walk_info->count++; | |
647 | } | |
648 | } | |
649 | ||
650 | cleanup: | |
651 | acpi_ut_remove_reference(pkg_desc); | |
652 | return_ACPI_STATUS(AE_OK); | |
653 | } |