evregion.c

  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
 17ACPI_MODULE_NAME("evregion")
 18
 19extern u8 acpi_gbl_default_address_spaces[];
 20
 21/* Local prototypes */
 22
 23static void
 24acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node *device_node,
 25				  acpi_adr_space_type space_id);
 26
 27static acpi_status
 28acpi_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
 44acpi_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
103acpi_status
104acpi_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, &region_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			  &region_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
318re_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
345void
346acpi_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 = &region_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
512acpi_status
513acpi_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
556acpi_status
557acpi_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
665cleanup2:
666	acpi_ut_remove_reference(args[0]);
667
668cleanup1:
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
689void
690acpi_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
754static acpi_status
755acpi_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
825static void
826acpi_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, &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
881exit:
882	/* We ignore all errors from above, don't care */
883
884	(void)acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
885	return_VOID;
886}