1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: evregion - Operation Region support
5 *
6 * Copyright (C) 2000 - 2025, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acevents.h"
13 #include "acnamesp.h"
14 #include "acinterp.h"
15
16 #define _COMPONENT ACPI_EVENTS
17 ACPI_MODULE_NAME("evregion")
18
19 extern u8 acpi_gbl_default_address_spaces[];
20
21 /* Local prototypes */
22
23 static void
24 acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node *device_node,
25 acpi_adr_space_type space_id);
26
27 static acpi_status
28 acpi_ev_reg_run(acpi_handle obj_handle,
29 u32 level, void *context, void **return_value);
30
31 /*******************************************************************************
32 *
33 * FUNCTION: acpi_ev_initialize_op_regions
34 *
35 * PARAMETERS: None
36 *
37 * RETURN: Status
38 *
39 * DESCRIPTION: Execute _REG methods for all Operation Regions that have
40 * an installed default region handler.
41 *
42 ******************************************************************************/
43
acpi_ev_initialize_op_regions(void)44 acpi_status acpi_ev_initialize_op_regions(void)
45 {
46 acpi_status status;
47 u32 i;
48
49 ACPI_FUNCTION_TRACE(ev_initialize_op_regions);
50
51 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
52 if (ACPI_FAILURE(status)) {
53 return_ACPI_STATUS(status);
54 }
55
56 /* Run the _REG methods for op_regions in each default address space */
57
58 for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
59 /*
60 * Make sure the installed handler is the DEFAULT handler. If not the
61 * default, the _REG methods will have already been run (when the
62 * handler was installed)
63 */
64 if (acpi_ev_has_default_handler(acpi_gbl_root_node,
65 acpi_gbl_default_address_spaces
66 [i])) {
67 acpi_ev_execute_reg_methods(acpi_gbl_root_node,
68 ACPI_UINT32_MAX,
69 acpi_gbl_default_address_spaces
70 [i], ACPI_REG_CONNECT);
71 }
72 }
73
74 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
75 return_ACPI_STATUS(status);
76 }
77
78 /*******************************************************************************
79 *
80 * FUNCTION: acpi_ev_address_space_dispatch
81 *
82 * PARAMETERS: region_obj - Internal region object
83 * field_obj - Corresponding field. Can be NULL.
84 * function - Read or Write operation
85 * region_offset - Where in the region to read or write
86 * bit_width - Field width in bits (8, 16, 32, or 64)
87 * value - Pointer to in or out value, must be
88 * a full 64-bit integer
89 *
90 * RETURN: Status
91 *
92 * DESCRIPTION: Dispatch an address space or operation region access to
93 * a previously installed handler.
94 *
95 * NOTE: During early initialization, we always install the default region
96 * handlers for Memory, I/O and PCI_Config. This ensures that these operation
97 * region address spaces are always available as per the ACPI specification.
98 * This is especially needed in order to support the execution of
99 * module-level AML code during loading of the ACPI tables.
100 *
101 ******************************************************************************/
102
103 acpi_status
acpi_ev_address_space_dispatch(union acpi_operand_object * region_obj,union acpi_operand_object * field_obj,u32 function,u32 region_offset,u32 bit_width,u64 * value)104 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
105 union acpi_operand_object *field_obj,
106 u32 function,
107 u32 region_offset, u32 bit_width, u64 *value)
108 {
109 acpi_status status;
110 acpi_adr_space_handler handler;
111 acpi_adr_space_setup region_setup;
112 union acpi_operand_object *handler_desc;
113 union acpi_operand_object *region_obj2;
114 void *region_context = NULL;
115 struct acpi_connection_info *context;
116 acpi_mutex context_mutex;
117 u8 context_locked;
118 acpi_physical_address address;
119
120 ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
121
122 region_obj2 = acpi_ns_get_secondary_object(region_obj);
123 if (!region_obj2) {
124 return_ACPI_STATUS(AE_NOT_EXIST);
125 }
126
127 /* Ensure that there is a handler associated with this region */
128
129 handler_desc = region_obj->region.handler;
130 if (!handler_desc) {
131 ACPI_ERROR((AE_INFO,
132 "No handler for Region [%4.4s] (%p) [%s]",
133 acpi_ut_get_node_name(region_obj->region.node),
134 region_obj,
135 acpi_ut_get_region_name(region_obj->region.
136 space_id)));
137
138 return_ACPI_STATUS(AE_NOT_EXIST);
139 }
140
141 context = handler_desc->address_space.context;
142 context_mutex = handler_desc->address_space.context_mutex;
143 context_locked = FALSE;
144
145 /*
146 * It may be the case that the region has never been initialized.
147 * Some types of regions require special init code
148 */
149 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
150
151 /* This region has not been initialized yet, do it */
152
153 region_setup = handler_desc->address_space.setup;
154 if (!region_setup) {
155
156 /* No initialization routine, exit with error */
157
158 ACPI_ERROR((AE_INFO,
159 "No init routine for region(%p) [%s]",
160 region_obj,
161 acpi_ut_get_region_name(region_obj->region.
162 space_id)));
163 return_ACPI_STATUS(AE_NOT_EXIST);
164 }
165
166 if (field_obj
167 && region_obj->region.space_id ==
168 ACPI_ADR_SPACE_PLATFORM_COMM) {
169 struct acpi_pcc_info *ctx =
170 handler_desc->address_space.context;
171
172 ctx->internal_buffer =
173 field_obj->field.internal_pcc_buffer;
174 ctx->length = (u16)region_obj->region.length;
175 ctx->subspace_id = (u8)region_obj->region.address;
176 }
177
178 if (region_obj->region.space_id ==
179 ACPI_ADR_SPACE_FIXED_HARDWARE) {
180 struct acpi_ffh_info *ctx =
181 handler_desc->address_space.context;
182
183 ctx->length = region_obj->region.length;
184 ctx->offset = region_obj->region.address;
185 }
186
187 /*
188 * We must exit the interpreter because the region setup will
189 * potentially execute control methods (for example, the _REG method
190 * for this region)
191 */
192 acpi_ex_exit_interpreter();
193
194 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
195 context, ®ion_context);
196
197 /* Re-enter the interpreter */
198
199 acpi_ex_enter_interpreter();
200
201 /* Check for failure of the Region Setup */
202
203 if (ACPI_FAILURE(status)) {
204 ACPI_EXCEPTION((AE_INFO, status,
205 "During region initialization: [%s]",
206 acpi_ut_get_region_name(region_obj->
207 region.
208 space_id)));
209 return_ACPI_STATUS(status);
210 }
211
212 /* Region initialization may have been completed by region_setup */
213
214 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
215 region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
216
217 /*
218 * Save the returned context for use in all accesses to
219 * the handler for this particular region
220 */
221 if (!(region_obj2->extra.region_context)) {
222 region_obj2->extra.region_context =
223 region_context;
224 }
225 }
226 }
227
228 /* We have everything we need, we can invoke the address space handler */
229
230 handler = handler_desc->address_space.handler;
231 address = (region_obj->region.address + region_offset);
232
233 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
234 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
235 ®ion_obj->region.handler->address_space, handler,
236 ACPI_FORMAT_UINT64(address),
237 acpi_ut_get_region_name(region_obj->region.
238 space_id)));
239
240 if (!(handler_desc->address_space.handler_flags &
241 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
242 /*
243 * For handlers other than the default (supplied) handlers, we must
244 * exit the interpreter because the handler *might* block -- we don't
245 * know what it will do, so we can't hold the lock on the interpreter.
246 */
247 acpi_ex_exit_interpreter();
248 }
249
250 /*
251 * Special handling for generic_serial_bus and general_purpose_io:
252 * There are three extra parameters that must be passed to the
253 * handler via the context:
254 * 1) Connection buffer, a resource template from Connection() op
255 * 2) Length of the above buffer
256 * 3) Actual access length from the access_as() op
257 *
258 * Since we pass these extra parameters via the context, which is
259 * shared between threads, we must lock the context to avoid these
260 * parameters being changed from another thread before the handler
261 * has completed running.
262 *
263 * In addition, for general_purpose_io, the Address and bit_width fields
264 * are defined as follows:
265 * 1) Address is the pin number index of the field (bit offset from
266 * the previous Connection)
267 * 2) bit_width is the actual bit length of the field (number of pins)
268 */
269 if ((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS ||
270 region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) &&
271 context && field_obj) {
272
273 status =
274 acpi_os_acquire_mutex(context_mutex, ACPI_WAIT_FOREVER);
275 if (ACPI_FAILURE(status)) {
276 goto re_enter_interpreter;
277 }
278
279 context_locked = TRUE;
280
281 /* Get the Connection (resource_template) buffer */
282
283 context->connection = field_obj->field.resource_buffer;
284 context->length = field_obj->field.resource_length;
285 context->access_length = field_obj->field.access_length;
286
287 if (region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) {
288 address = field_obj->field.pin_number_index;
289 bit_width = field_obj->field.bit_length;
290 }
291 }
292
293 /* Call the handler */
294
295 status = handler(function, address, bit_width, value, context,
296 region_obj2->extra.region_context);
297
298 if (context_locked) {
299 acpi_os_release_mutex(context_mutex);
300 }
301
302 if (ACPI_FAILURE(status)) {
303 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
304 acpi_ut_get_region_name(region_obj->region.
305 space_id)));
306
307 /*
308 * Special case for an EC timeout. These are seen so frequently
309 * that an additional error message is helpful
310 */
311 if ((region_obj->region.space_id == ACPI_ADR_SPACE_EC) &&
312 (status == AE_TIME)) {
313 ACPI_ERROR((AE_INFO,
314 "Timeout from EC hardware or EC device driver"));
315 }
316 }
317
318 re_enter_interpreter:
319 if (!(handler_desc->address_space.handler_flags &
320 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
321 /*
322 * We just returned from a non-default handler, we must re-enter the
323 * interpreter
324 */
325 acpi_ex_enter_interpreter();
326 }
327
328 return_ACPI_STATUS(status);
329 }
330
331 /*******************************************************************************
332 *
333 * FUNCTION: acpi_ev_detach_region
334 *
335 * PARAMETERS: region_obj - Region Object
336 * acpi_ns_is_locked - Namespace Region Already Locked?
337 *
338 * RETURN: None
339 *
340 * DESCRIPTION: Break the association between the handler and the region
341 * this is a two way association.
342 *
343 ******************************************************************************/
344
345 void
acpi_ev_detach_region(union acpi_operand_object * region_obj,u8 acpi_ns_is_locked)346 acpi_ev_detach_region(union acpi_operand_object *region_obj,
347 u8 acpi_ns_is_locked)
348 {
349 union acpi_operand_object *handler_obj;
350 union acpi_operand_object *obj_desc;
351 union acpi_operand_object *start_desc;
352 union acpi_operand_object **last_obj_ptr;
353 acpi_adr_space_setup region_setup;
354 void **region_context;
355 union acpi_operand_object *region_obj2;
356 acpi_status status;
357
358 ACPI_FUNCTION_TRACE(ev_detach_region);
359
360 region_obj2 = acpi_ns_get_secondary_object(region_obj);
361 if (!region_obj2) {
362 return_VOID;
363 }
364 region_context = ®ion_obj2->extra.region_context;
365
366 /* Get the address handler from the region object */
367
368 handler_obj = region_obj->region.handler;
369 if (!handler_obj) {
370
371 /* This region has no handler, all done */
372
373 return_VOID;
374 }
375
376 /* Find this region in the handler's list */
377
378 obj_desc = handler_obj->address_space.region_list;
379 start_desc = obj_desc;
380 last_obj_ptr = &handler_obj->address_space.region_list;
381
382 while (obj_desc) {
383
384 /* Is this the correct Region? */
385
386 if (obj_desc == region_obj) {
387 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
388 "Removing Region %p from address handler %p\n",
389 region_obj, handler_obj));
390
391 /* This is it, remove it from the handler's list */
392
393 *last_obj_ptr = obj_desc->region.next;
394 obj_desc->region.next = NULL; /* Must clear field */
395
396 if (acpi_ns_is_locked) {
397 status =
398 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
399 if (ACPI_FAILURE(status)) {
400 return_VOID;
401 }
402 }
403
404 /* Now stop region accesses by executing the _REG method */
405
406 status =
407 acpi_ev_execute_reg_method(region_obj,
408 ACPI_REG_DISCONNECT);
409 if (ACPI_FAILURE(status)) {
410 ACPI_EXCEPTION((AE_INFO, status,
411 "from region _REG, [%s]",
412 acpi_ut_get_region_name
413 (region_obj->region.space_id)));
414 }
415
416 if (acpi_ns_is_locked) {
417 status =
418 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
419 if (ACPI_FAILURE(status)) {
420 return_VOID;
421 }
422 }
423
424 /*
425 * If the region has been activated, call the setup handler with
426 * the deactivate notification
427 */
428 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
429 region_setup = handler_obj->address_space.setup;
430 status =
431 region_setup(region_obj,
432 ACPI_REGION_DEACTIVATE,
433 handler_obj->address_space.
434 context, region_context);
435
436 /*
437 * region_context should have been released by the deactivate
438 * operation. We don't need access to it anymore here.
439 */
440 if (region_context) {
441 *region_context = NULL;
442 }
443
444 /* Init routine may fail, Just ignore errors */
445
446 if (ACPI_FAILURE(status)) {
447 ACPI_EXCEPTION((AE_INFO, status,
448 "from region handler - deactivate, [%s]",
449 acpi_ut_get_region_name
450 (region_obj->region.
451 space_id)));
452 }
453
454 region_obj->region.flags &=
455 ~(AOPOBJ_SETUP_COMPLETE);
456 }
457
458 /*
459 * Remove handler reference in the region
460 *
461 * NOTE: this doesn't mean that the region goes away, the region
462 * is just inaccessible as indicated to the _REG method
463 *
464 * If the region is on the handler's list, this must be the
465 * region's handler
466 */
467 region_obj->region.handler = NULL;
468 acpi_ut_remove_reference(handler_obj);
469
470 return_VOID;
471 }
472
473 /* Walk the linked list of handlers */
474
475 last_obj_ptr = &obj_desc->region.next;
476 obj_desc = obj_desc->region.next;
477
478 /* Prevent infinite loop if list is corrupted */
479
480 if (obj_desc == start_desc) {
481 ACPI_ERROR((AE_INFO,
482 "Circular handler list in region object %p",
483 region_obj));
484 return_VOID;
485 }
486 }
487
488 /* If we get here, the region was not in the handler's region list */
489
490 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
491 "Cannot remove region %p from address handler %p\n",
492 region_obj, handler_obj));
493
494 return_VOID;
495 }
496
497 /*******************************************************************************
498 *
499 * FUNCTION: acpi_ev_attach_region
500 *
501 * PARAMETERS: handler_obj - Handler Object
502 * region_obj - Region Object
503 * acpi_ns_is_locked - Namespace Region Already Locked?
504 *
505 * RETURN: None
506 *
507 * DESCRIPTION: Create the association between the handler and the region
508 * this is a two way association.
509 *
510 ******************************************************************************/
511
512 acpi_status
acpi_ev_attach_region(union acpi_operand_object * handler_obj,union acpi_operand_object * region_obj,u8 acpi_ns_is_locked)513 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
514 union acpi_operand_object *region_obj,
515 u8 acpi_ns_is_locked)
516 {
517
518 ACPI_FUNCTION_TRACE(ev_attach_region);
519
520 /* Install the region's handler */
521
522 if (region_obj->region.handler) {
523 return_ACPI_STATUS(AE_ALREADY_EXISTS);
524 }
525
526 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
527 "Adding Region [%4.4s] %p to address handler %p [%s]\n",
528 acpi_ut_get_node_name(region_obj->region.node),
529 region_obj, handler_obj,
530 acpi_ut_get_region_name(region_obj->region.
531 space_id)));
532
533 /* Link this region to the front of the handler's list */
534
535 region_obj->region.next = handler_obj->address_space.region_list;
536 handler_obj->address_space.region_list = region_obj;
537 region_obj->region.handler = handler_obj;
538 acpi_ut_add_reference(handler_obj);
539
540 return_ACPI_STATUS(AE_OK);
541 }
542
543 /*******************************************************************************
544 *
545 * FUNCTION: acpi_ev_execute_reg_method
546 *
547 * PARAMETERS: region_obj - Region object
548 * function - Passed to _REG: On (1) or Off (0)
549 *
550 * RETURN: Status
551 *
552 * DESCRIPTION: Execute _REG method for a region
553 *
554 ******************************************************************************/
555
556 acpi_status
acpi_ev_execute_reg_method(union acpi_operand_object * region_obj,u32 function)557 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
558 {
559 struct acpi_evaluate_info *info;
560 union acpi_operand_object *args[3];
561 union acpi_operand_object *region_obj2;
562 const acpi_name *reg_name_ptr =
563 ACPI_CAST_PTR(acpi_name, METHOD_NAME__REG);
564 struct acpi_namespace_node *method_node;
565 struct acpi_namespace_node *node;
566 acpi_status status;
567
568 ACPI_FUNCTION_TRACE(ev_execute_reg_method);
569
570 if (!acpi_gbl_namespace_initialized ||
571 region_obj->region.handler == NULL) {
572 return_ACPI_STATUS(AE_OK);
573 }
574
575 region_obj2 = acpi_ns_get_secondary_object(region_obj);
576 if (!region_obj2) {
577 return_ACPI_STATUS(AE_NOT_EXIST);
578 }
579
580 /*
581 * Find any "_REG" method associated with this region definition.
582 * The method should always be updated as this function may be
583 * invoked after a namespace change.
584 */
585 node = region_obj->region.node->parent;
586 status =
587 acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
588 &method_node);
589 if (ACPI_SUCCESS(status)) {
590 /*
591 * The _REG method is optional and there can be only one per
592 * region definition. This will be executed when the handler is
593 * attached or removed.
594 */
595 region_obj2->extra.method_REG = method_node;
596 }
597 if (region_obj2->extra.method_REG == NULL) {
598 return_ACPI_STATUS(AE_OK);
599 }
600
601 /* _REG(DISCONNECT) should be paired with _REG(CONNECT) */
602
603 if ((function == ACPI_REG_CONNECT &&
604 region_obj->common.flags & AOPOBJ_REG_CONNECTED) ||
605 (function == ACPI_REG_DISCONNECT &&
606 !(region_obj->common.flags & AOPOBJ_REG_CONNECTED))) {
607 return_ACPI_STATUS(AE_OK);
608 }
609
610 /* Allocate and initialize the evaluation information block */
611
612 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
613 if (!info) {
614 return_ACPI_STATUS(AE_NO_MEMORY);
615 }
616
617 info->prefix_node = region_obj2->extra.method_REG;
618 info->relative_pathname = NULL;
619 info->parameters = args;
620 info->flags = ACPI_IGNORE_RETURN_VALUE;
621
622 /*
623 * The _REG method has two arguments:
624 *
625 * arg0 - Integer:
626 * Operation region space ID Same value as region_obj->Region.space_id
627 *
628 * arg1 - Integer:
629 * connection status 1 for connecting the handler, 0 for disconnecting
630 * the handler (Passed as a parameter)
631 */
632 args[0] =
633 acpi_ut_create_integer_object((u64)region_obj->region.space_id);
634 if (!args[0]) {
635 status = AE_NO_MEMORY;
636 goto cleanup1;
637 }
638
639 args[1] = acpi_ut_create_integer_object((u64)function);
640 if (!args[1]) {
641 status = AE_NO_MEMORY;
642 goto cleanup2;
643 }
644
645 args[2] = NULL; /* Terminate list */
646
647 /* Execute the method, no return value */
648
649 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
650 (ACPI_TYPE_METHOD, info->prefix_node, NULL));
651
652 status = acpi_ns_evaluate(info);
653 acpi_ut_remove_reference(args[1]);
654
655 if (ACPI_FAILURE(status)) {
656 goto cleanup2;
657 }
658
659 if (function == ACPI_REG_CONNECT) {
660 region_obj->common.flags |= AOPOBJ_REG_CONNECTED;
661 } else {
662 region_obj->common.flags &= ~AOPOBJ_REG_CONNECTED;
663 }
664
665 cleanup2:
666 acpi_ut_remove_reference(args[0]);
667
668 cleanup1:
669 ACPI_FREE(info);
670 return_ACPI_STATUS(status);
671 }
672
673 /*******************************************************************************
674 *
675 * FUNCTION: acpi_ev_execute_reg_methods
676 *
677 * PARAMETERS: node - Namespace node for the device
678 * max_depth - Depth to which search for _REG
679 * space_id - The address space ID
680 * function - Passed to _REG: On (1) or Off (0)
681 *
682 * RETURN: None
683 *
684 * DESCRIPTION: Run all _REG methods for the input Space ID;
685 * Note: assumes namespace is locked, or system init time.
686 *
687 ******************************************************************************/
688
689 void
acpi_ev_execute_reg_methods(struct acpi_namespace_node * node,u32 max_depth,acpi_adr_space_type space_id,u32 function)690 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node, u32 max_depth,
691 acpi_adr_space_type space_id, u32 function)
692 {
693 struct acpi_reg_walk_info info;
694
695 ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
696
697 /*
698 * These address spaces do not need a call to _REG, since the ACPI
699 * specification defines them as: "must always be accessible". Since
700 * they never change state (never become unavailable), no need to ever
701 * call _REG on them. Also, a data_table is not a "real" address space,
702 * so do not call _REG. September 2018.
703 */
704 if ((space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) ||
705 (space_id == ACPI_ADR_SPACE_SYSTEM_IO) ||
706 (space_id == ACPI_ADR_SPACE_DATA_TABLE)) {
707 return_VOID;
708 }
709
710 info.space_id = space_id;
711 info.function = function;
712 info.reg_run_count = 0;
713
714 ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES,
715 " Running _REG methods for SpaceId %s\n",
716 acpi_ut_get_region_name(info.space_id)));
717
718 /*
719 * Run all _REG methods for all Operation Regions for this space ID. This
720 * is a separate walk in order to handle any interdependencies between
721 * regions and _REG methods. (i.e. handlers must be installed for all
722 * regions of this Space ID before we can run any _REG methods)
723 */
724 (void)acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, max_depth,
725 ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run, NULL,
726 &info, NULL);
727
728 /*
729 * Special case for EC and GPIO: handle "orphan" _REG methods with
730 * no region.
731 */
732 if (space_id == ACPI_ADR_SPACE_EC || space_id == ACPI_ADR_SPACE_GPIO) {
733 acpi_ev_execute_orphan_reg_method(node, space_id);
734 }
735
736 ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES,
737 " Executed %u _REG methods for SpaceId %s\n",
738 info.reg_run_count,
739 acpi_ut_get_region_name(info.space_id)));
740
741 return_VOID;
742 }
743
744 /*******************************************************************************
745 *
746 * FUNCTION: acpi_ev_reg_run
747 *
748 * PARAMETERS: walk_namespace callback
749 *
750 * DESCRIPTION: Run _REG method for region objects of the requested spaceID
751 *
752 ******************************************************************************/
753
754 static acpi_status
acpi_ev_reg_run(acpi_handle obj_handle,u32 level,void * context,void ** return_value)755 acpi_ev_reg_run(acpi_handle obj_handle,
756 u32 level, void *context, void **return_value)
757 {
758 union acpi_operand_object *obj_desc;
759 struct acpi_namespace_node *node;
760 acpi_status status;
761 struct acpi_reg_walk_info *info;
762
763 info = ACPI_CAST_PTR(struct acpi_reg_walk_info, context);
764
765 /* Convert and validate the device handle */
766
767 node = acpi_ns_validate_handle(obj_handle);
768 if (!node) {
769 return (AE_BAD_PARAMETER);
770 }
771
772 /*
773 * We only care about regions and objects that are allowed to have
774 * address space handlers
775 */
776 if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
777 return (AE_OK);
778 }
779
780 /* Check for an existing internal object */
781
782 obj_desc = acpi_ns_get_attached_object(node);
783 if (!obj_desc) {
784
785 /* No object, just exit */
786
787 return (AE_OK);
788 }
789
790 /* Object is a Region */
791
792 if (obj_desc->region.space_id != info->space_id) {
793
794 /* This region is for a different address space, just ignore it */
795
796 return (AE_OK);
797 }
798
799 info->reg_run_count++;
800 status = acpi_ev_execute_reg_method(obj_desc, info->function);
801 return (status);
802 }
803
804 /*******************************************************************************
805 *
806 * FUNCTION: acpi_ev_execute_orphan_reg_method
807 *
808 * PARAMETERS: device_node - Namespace node for an ACPI device
809 * space_id - The address space ID
810 *
811 * RETURN: None
812 *
813 * DESCRIPTION: Execute an "orphan" _REG method that appears under an ACPI
814 * device. This is a _REG method that has no corresponding region
815 * within the device's scope. ACPI tables depending on these
816 * "orphan" _REG methods have been seen for both EC and GPIO
817 * Operation Regions. Presumably the Windows ACPI implementation
818 * always calls the _REG method independent of the presence of
819 * an actual Operation Region with the correct address space ID.
820 *
821 * MUTEX: Assumes the namespace is locked
822 *
823 ******************************************************************************/
824
825 static void
acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node * device_node,acpi_adr_space_type space_id)826 acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node *device_node,
827 acpi_adr_space_type space_id)
828 {
829 acpi_handle reg_method;
830 struct acpi_namespace_node *next_node;
831 acpi_status status;
832 struct acpi_object_list args;
833 union acpi_object objects[2];
834
835 ACPI_FUNCTION_TRACE(ev_execute_orphan_reg_method);
836
837 if (!device_node) {
838 return_VOID;
839 }
840
841 /* Namespace is currently locked, must release */
842
843 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
844
845 /* Get a handle to a _REG method immediately under the EC device */
846
847 status = acpi_get_handle(device_node, METHOD_NAME__REG, ®_method);
848 if (ACPI_FAILURE(status)) {
849 goto exit; /* There is no _REG method present */
850 }
851
852 /*
853 * Execute the _REG method only if there is no Operation Region in
854 * this scope with the Embedded Controller space ID. Otherwise, it
855 * will already have been executed. Note, this allows for Regions
856 * with other space IDs to be present; but the code below will then
857 * execute the _REG method with the embedded_control space_ID argument.
858 */
859 next_node = acpi_ns_get_next_node(device_node, NULL);
860 while (next_node) {
861 if ((next_node->type == ACPI_TYPE_REGION) &&
862 (next_node->object) &&
863 (next_node->object->region.space_id == space_id)) {
864 goto exit; /* Do not execute the _REG */
865 }
866
867 next_node = acpi_ns_get_next_node(device_node, next_node);
868 }
869
870 /* Evaluate the _REG(space_id,Connect) method */
871
872 args.count = 2;
873 args.pointer = objects;
874 objects[0].type = ACPI_TYPE_INTEGER;
875 objects[0].integer.value = space_id;
876 objects[1].type = ACPI_TYPE_INTEGER;
877 objects[1].integer.value = ACPI_REG_CONNECT;
878
879 (void)acpi_evaluate_object(reg_method, NULL, &args, NULL);
880
881 exit:
882 /* We ignore all errors from above, don't care */
883
884 (void)acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
885 return_VOID;
886 }
887