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 - 2021, 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_gbl_default_address_spaces
69 [i], ACPI_REG_CONNECT);
70 }
71 }
72
73 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
74 return_ACPI_STATUS(status);
75 }
76
77 /*******************************************************************************
78 *
79 * FUNCTION: acpi_ev_address_space_dispatch
80 *
81 * PARAMETERS: region_obj - Internal region object
82 * field_obj - Corresponding field. Can be NULL.
83 * function - Read or Write operation
84 * region_offset - Where in the region to read or write
85 * bit_width - Field width in bits (8, 16, 32, or 64)
86 * value - Pointer to in or out value, must be
87 * a full 64-bit integer
88 *
89 * RETURN: Status
90 *
91 * DESCRIPTION: Dispatch an address space or operation region access to
92 * a previously installed handler.
93 *
94 * NOTE: During early initialization, we always install the default region
95 * handlers for Memory, I/O and PCI_Config. This ensures that these operation
96 * region address spaces are always available as per the ACPI specification.
97 * This is especially needed in order to support the execution of
98 * module-level AML code during loading of the ACPI tables.
99 *
100 ******************************************************************************/
101
102 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)103 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
104 union acpi_operand_object *field_obj,
105 u32 function,
106 u32 region_offset, u32 bit_width, u64 *value)
107 {
108 acpi_status status;
109 acpi_adr_space_handler handler;
110 acpi_adr_space_setup region_setup;
111 union acpi_operand_object *handler_desc;
112 union acpi_operand_object *region_obj2;
113 void *region_context = NULL;
114 struct acpi_connection_info *context;
115 acpi_mutex context_mutex;
116 u8 context_locked;
117 acpi_physical_address address;
118
119 ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
120
121 region_obj2 = acpi_ns_get_secondary_object(region_obj);
122 if (!region_obj2) {
123 return_ACPI_STATUS(AE_NOT_EXIST);
124 }
125
126 /* Ensure that there is a handler associated with this region */
127
128 handler_desc = region_obj->region.handler;
129 if (!handler_desc) {
130 ACPI_ERROR((AE_INFO,
131 "No handler for Region [%4.4s] (%p) [%s]",
132 acpi_ut_get_node_name(region_obj->region.node),
133 region_obj,
134 acpi_ut_get_region_name(region_obj->region.
135 space_id)));
136
137 return_ACPI_STATUS(AE_NOT_EXIST);
138 }
139
140 context = handler_desc->address_space.context;
141 context_mutex = handler_desc->address_space.context_mutex;
142 context_locked = FALSE;
143
144 /*
145 * It may be the case that the region has never been initialized.
146 * Some types of regions require special init code
147 */
148 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
149
150 /* This region has not been initialized yet, do it */
151
152 region_setup = handler_desc->address_space.setup;
153 if (!region_setup) {
154
155 /* No initialization routine, exit with error */
156
157 ACPI_ERROR((AE_INFO,
158 "No init routine for region(%p) [%s]",
159 region_obj,
160 acpi_ut_get_region_name(region_obj->region.
161 space_id)));
162 return_ACPI_STATUS(AE_NOT_EXIST);
163 }
164
165 /*
166 * We must exit the interpreter because the region setup will
167 * potentially execute control methods (for example, the _REG method
168 * for this region)
169 */
170 acpi_ex_exit_interpreter();
171
172 status = region_setup(region_obj, ACPI_REGION_ACTIVATE,
173 context, ®ion_context);
174
175 /* Re-enter the interpreter */
176
177 acpi_ex_enter_interpreter();
178
179 /* Check for failure of the Region Setup */
180
181 if (ACPI_FAILURE(status)) {
182 ACPI_EXCEPTION((AE_INFO, status,
183 "During region initialization: [%s]",
184 acpi_ut_get_region_name(region_obj->
185 region.
186 space_id)));
187 return_ACPI_STATUS(status);
188 }
189
190 /* Region initialization may have been completed by region_setup */
191
192 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
193 region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
194
195 /*
196 * Save the returned context for use in all accesses to
197 * the handler for this particular region
198 */
199 if (!(region_obj2->extra.region_context)) {
200 region_obj2->extra.region_context =
201 region_context;
202 }
203 }
204 }
205
206 /* We have everything we need, we can invoke the address space handler */
207
208 handler = handler_desc->address_space.handler;
209 address = (region_obj->region.address + region_offset);
210
211 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
212 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
213 ®ion_obj->region.handler->address_space, handler,
214 ACPI_FORMAT_UINT64(address),
215 acpi_ut_get_region_name(region_obj->region.
216 space_id)));
217
218 if (!(handler_desc->address_space.handler_flags &
219 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
220 /*
221 * For handlers other than the default (supplied) handlers, we must
222 * exit the interpreter because the handler *might* block -- we don't
223 * know what it will do, so we can't hold the lock on the interpreter.
224 */
225 acpi_ex_exit_interpreter();
226 }
227
228 /*
229 * Special handling for generic_serial_bus and general_purpose_io:
230 * There are three extra parameters that must be passed to the
231 * handler via the context:
232 * 1) Connection buffer, a resource template from Connection() op
233 * 2) Length of the above buffer
234 * 3) Actual access length from the access_as() op
235 *
236 * Since we pass these extra parameters via the context, which is
237 * shared between threads, we must lock the context to avoid these
238 * parameters being changed from another thread before the handler
239 * has completed running.
240 *
241 * In addition, for general_purpose_io, the Address and bit_width fields
242 * are defined as follows:
243 * 1) Address is the pin number index of the field (bit offset from
244 * the previous Connection)
245 * 2) bit_width is the actual bit length of the field (number of pins)
246 */
247 if ((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS ||
248 region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) &&
249 context && field_obj) {
250
251 status =
252 acpi_os_acquire_mutex(context_mutex, ACPI_WAIT_FOREVER);
253 if (ACPI_FAILURE(status)) {
254 goto re_enter_interpreter;
255 }
256
257 context_locked = TRUE;
258
259 /* Get the Connection (resource_template) buffer */
260
261 context->connection = field_obj->field.resource_buffer;
262 context->length = field_obj->field.resource_length;
263 context->access_length = field_obj->field.access_length;
264
265 if (region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) {
266 address = field_obj->field.pin_number_index;
267 bit_width = field_obj->field.bit_length;
268 }
269 }
270
271 /* Call the handler */
272
273 status = handler(function, address, bit_width, value, context,
274 region_obj2->extra.region_context);
275
276 if (context_locked) {
277 acpi_os_release_mutex(context_mutex);
278 }
279
280 if (ACPI_FAILURE(status)) {
281 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
282 acpi_ut_get_region_name(region_obj->region.
283 space_id)));
284
285 /*
286 * Special case for an EC timeout. These are seen so frequently
287 * that an additional error message is helpful
288 */
289 if ((region_obj->region.space_id == ACPI_ADR_SPACE_EC) &&
290 (status == AE_TIME)) {
291 ACPI_ERROR((AE_INFO,
292 "Timeout from EC hardware or EC device driver"));
293 }
294 }
295
296 re_enter_interpreter:
297 if (!(handler_desc->address_space.handler_flags &
298 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
299 /*
300 * We just returned from a non-default handler, we must re-enter the
301 * interpreter
302 */
303 acpi_ex_enter_interpreter();
304 }
305
306 return_ACPI_STATUS(status);
307 }
308
309 /*******************************************************************************
310 *
311 * FUNCTION: acpi_ev_detach_region
312 *
313 * PARAMETERS: region_obj - Region Object
314 * acpi_ns_is_locked - Namespace Region Already Locked?
315 *
316 * RETURN: None
317 *
318 * DESCRIPTION: Break the association between the handler and the region
319 * this is a two way association.
320 *
321 ******************************************************************************/
322
323 void
acpi_ev_detach_region(union acpi_operand_object * region_obj,u8 acpi_ns_is_locked)324 acpi_ev_detach_region(union acpi_operand_object *region_obj,
325 u8 acpi_ns_is_locked)
326 {
327 union acpi_operand_object *handler_obj;
328 union acpi_operand_object *obj_desc;
329 union acpi_operand_object *start_desc;
330 union acpi_operand_object **last_obj_ptr;
331 acpi_adr_space_setup region_setup;
332 void **region_context;
333 union acpi_operand_object *region_obj2;
334 acpi_status status;
335
336 ACPI_FUNCTION_TRACE(ev_detach_region);
337
338 region_obj2 = acpi_ns_get_secondary_object(region_obj);
339 if (!region_obj2) {
340 return_VOID;
341 }
342 region_context = ®ion_obj2->extra.region_context;
343
344 /* Get the address handler from the region object */
345
346 handler_obj = region_obj->region.handler;
347 if (!handler_obj) {
348
349 /* This region has no handler, all done */
350
351 return_VOID;
352 }
353
354 /* Find this region in the handler's list */
355
356 obj_desc = handler_obj->address_space.region_list;
357 start_desc = obj_desc;
358 last_obj_ptr = &handler_obj->address_space.region_list;
359
360 while (obj_desc) {
361
362 /* Is this the correct Region? */
363
364 if (obj_desc == region_obj) {
365 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
366 "Removing Region %p from address handler %p\n",
367 region_obj, handler_obj));
368
369 /* This is it, remove it from the handler's list */
370
371 *last_obj_ptr = obj_desc->region.next;
372 obj_desc->region.next = NULL; /* Must clear field */
373
374 if (acpi_ns_is_locked) {
375 status =
376 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
377 if (ACPI_FAILURE(status)) {
378 return_VOID;
379 }
380 }
381
382 /* Now stop region accesses by executing the _REG method */
383
384 status =
385 acpi_ev_execute_reg_method(region_obj,
386 ACPI_REG_DISCONNECT);
387 if (ACPI_FAILURE(status)) {
388 ACPI_EXCEPTION((AE_INFO, status,
389 "from region _REG, [%s]",
390 acpi_ut_get_region_name
391 (region_obj->region.space_id)));
392 }
393
394 if (acpi_ns_is_locked) {
395 status =
396 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
397 if (ACPI_FAILURE(status)) {
398 return_VOID;
399 }
400 }
401
402 /*
403 * If the region has been activated, call the setup handler with
404 * the deactivate notification
405 */
406 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
407 region_setup = handler_obj->address_space.setup;
408 status =
409 region_setup(region_obj,
410 ACPI_REGION_DEACTIVATE,
411 handler_obj->address_space.
412 context, region_context);
413
414 /*
415 * region_context should have been released by the deactivate
416 * operation. We don't need access to it anymore here.
417 */
418 if (region_context) {
419 *region_context = NULL;
420 }
421
422 /* Init routine may fail, Just ignore errors */
423
424 if (ACPI_FAILURE(status)) {
425 ACPI_EXCEPTION((AE_INFO, status,
426 "from region handler - deactivate, [%s]",
427 acpi_ut_get_region_name
428 (region_obj->region.
429 space_id)));
430 }
431
432 region_obj->region.flags &=
433 ~(AOPOBJ_SETUP_COMPLETE);
434 }
435
436 /*
437 * Remove handler reference in the region
438 *
439 * NOTE: this doesn't mean that the region goes away, the region
440 * is just inaccessible as indicated to the _REG method
441 *
442 * If the region is on the handler's list, this must be the
443 * region's handler
444 */
445 region_obj->region.handler = NULL;
446 acpi_ut_remove_reference(handler_obj);
447
448 return_VOID;
449 }
450
451 /* Walk the linked list of handlers */
452
453 last_obj_ptr = &obj_desc->region.next;
454 obj_desc = obj_desc->region.next;
455
456 /* Prevent infinite loop if list is corrupted */
457
458 if (obj_desc == start_desc) {
459 ACPI_ERROR((AE_INFO,
460 "Circular handler list in region object %p",
461 region_obj));
462 return_VOID;
463 }
464 }
465
466 /* If we get here, the region was not in the handler's region list */
467
468 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
469 "Cannot remove region %p from address handler %p\n",
470 region_obj, handler_obj));
471
472 return_VOID;
473 }
474
475 /*******************************************************************************
476 *
477 * FUNCTION: acpi_ev_attach_region
478 *
479 * PARAMETERS: handler_obj - Handler Object
480 * region_obj - Region Object
481 * acpi_ns_is_locked - Namespace Region Already Locked?
482 *
483 * RETURN: None
484 *
485 * DESCRIPTION: Create the association between the handler and the region
486 * this is a two way association.
487 *
488 ******************************************************************************/
489
490 acpi_status
acpi_ev_attach_region(union acpi_operand_object * handler_obj,union acpi_operand_object * region_obj,u8 acpi_ns_is_locked)491 acpi_ev_attach_region(union acpi_operand_object *handler_obj,
492 union acpi_operand_object *region_obj,
493 u8 acpi_ns_is_locked)
494 {
495
496 ACPI_FUNCTION_TRACE(ev_attach_region);
497
498 /* Install the region's handler */
499
500 if (region_obj->region.handler) {
501 return_ACPI_STATUS(AE_ALREADY_EXISTS);
502 }
503
504 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
505 "Adding Region [%4.4s] %p to address handler %p [%s]\n",
506 acpi_ut_get_node_name(region_obj->region.node),
507 region_obj, handler_obj,
508 acpi_ut_get_region_name(region_obj->region.
509 space_id)));
510
511 /* Link this region to the front of the handler's list */
512
513 region_obj->region.next = handler_obj->address_space.region_list;
514 handler_obj->address_space.region_list = region_obj;
515 region_obj->region.handler = handler_obj;
516 acpi_ut_add_reference(handler_obj);
517
518 return_ACPI_STATUS(AE_OK);
519 }
520
521 /*******************************************************************************
522 *
523 * FUNCTION: acpi_ev_execute_reg_method
524 *
525 * PARAMETERS: region_obj - Region object
526 * function - Passed to _REG: On (1) or Off (0)
527 *
528 * RETURN: Status
529 *
530 * DESCRIPTION: Execute _REG method for a region
531 *
532 ******************************************************************************/
533
534 acpi_status
acpi_ev_execute_reg_method(union acpi_operand_object * region_obj,u32 function)535 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
536 {
537 struct acpi_evaluate_info *info;
538 union acpi_operand_object *args[3];
539 union acpi_operand_object *region_obj2;
540 const acpi_name *reg_name_ptr =
541 ACPI_CAST_PTR(acpi_name, METHOD_NAME__REG);
542 struct acpi_namespace_node *method_node;
543 struct acpi_namespace_node *node;
544 acpi_status status;
545
546 ACPI_FUNCTION_TRACE(ev_execute_reg_method);
547
548 if (!acpi_gbl_namespace_initialized ||
549 region_obj->region.handler == NULL) {
550 return_ACPI_STATUS(AE_OK);
551 }
552
553 region_obj2 = acpi_ns_get_secondary_object(region_obj);
554 if (!region_obj2) {
555 return_ACPI_STATUS(AE_NOT_EXIST);
556 }
557
558 /*
559 * Find any "_REG" method associated with this region definition.
560 * The method should always be updated as this function may be
561 * invoked after a namespace change.
562 */
563 node = region_obj->region.node->parent;
564 status =
565 acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
566 &method_node);
567 if (ACPI_SUCCESS(status)) {
568 /*
569 * The _REG method is optional and there can be only one per
570 * region definition. This will be executed when the handler is
571 * attached or removed.
572 */
573 region_obj2->extra.method_REG = method_node;
574 }
575 if (region_obj2->extra.method_REG == NULL) {
576 return_ACPI_STATUS(AE_OK);
577 }
578
579 /* _REG(DISCONNECT) should be paired with _REG(CONNECT) */
580
581 if ((function == ACPI_REG_CONNECT &&
582 region_obj->common.flags & AOPOBJ_REG_CONNECTED) ||
583 (function == ACPI_REG_DISCONNECT &&
584 !(region_obj->common.flags & AOPOBJ_REG_CONNECTED))) {
585 return_ACPI_STATUS(AE_OK);
586 }
587
588 /* Allocate and initialize the evaluation information block */
589
590 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
591 if (!info) {
592 return_ACPI_STATUS(AE_NO_MEMORY);
593 }
594
595 info->prefix_node = region_obj2->extra.method_REG;
596 info->relative_pathname = NULL;
597 info->parameters = args;
598 info->flags = ACPI_IGNORE_RETURN_VALUE;
599
600 /*
601 * The _REG method has two arguments:
602 *
603 * arg0 - Integer:
604 * Operation region space ID Same value as region_obj->Region.space_id
605 *
606 * arg1 - Integer:
607 * connection status 1 for connecting the handler, 0 for disconnecting
608 * the handler (Passed as a parameter)
609 */
610 args[0] =
611 acpi_ut_create_integer_object((u64)region_obj->region.space_id);
612 if (!args[0]) {
613 status = AE_NO_MEMORY;
614 goto cleanup1;
615 }
616
617 args[1] = acpi_ut_create_integer_object((u64)function);
618 if (!args[1]) {
619 status = AE_NO_MEMORY;
620 goto cleanup2;
621 }
622
623 args[2] = NULL; /* Terminate list */
624
625 /* Execute the method, no return value */
626
627 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
628 (ACPI_TYPE_METHOD, info->prefix_node, NULL));
629
630 status = acpi_ns_evaluate(info);
631 acpi_ut_remove_reference(args[1]);
632
633 if (ACPI_FAILURE(status)) {
634 goto cleanup2;
635 }
636
637 if (function == ACPI_REG_CONNECT) {
638 region_obj->common.flags |= AOPOBJ_REG_CONNECTED;
639 } else {
640 region_obj->common.flags &= ~AOPOBJ_REG_CONNECTED;
641 }
642
643 cleanup2:
644 acpi_ut_remove_reference(args[0]);
645
646 cleanup1:
647 ACPI_FREE(info);
648 return_ACPI_STATUS(status);
649 }
650
651 /*******************************************************************************
652 *
653 * FUNCTION: acpi_ev_execute_reg_methods
654 *
655 * PARAMETERS: node - Namespace node for the device
656 * space_id - The address space ID
657 * function - Passed to _REG: On (1) or Off (0)
658 *
659 * RETURN: None
660 *
661 * DESCRIPTION: Run all _REG methods for the input Space ID;
662 * Note: assumes namespace is locked, or system init time.
663 *
664 ******************************************************************************/
665
666 void
acpi_ev_execute_reg_methods(struct acpi_namespace_node * node,acpi_adr_space_type space_id,u32 function)667 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
668 acpi_adr_space_type space_id, u32 function)
669 {
670 struct acpi_reg_walk_info info;
671
672 ACPI_FUNCTION_TRACE(ev_execute_reg_methods);
673
674 /*
675 * These address spaces do not need a call to _REG, since the ACPI
676 * specification defines them as: "must always be accessible". Since
677 * they never change state (never become unavailable), no need to ever
678 * call _REG on them. Also, a data_table is not a "real" address space,
679 * so do not call _REG. September 2018.
680 */
681 if ((space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) ||
682 (space_id == ACPI_ADR_SPACE_SYSTEM_IO) ||
683 (space_id == ACPI_ADR_SPACE_DATA_TABLE)) {
684 return_VOID;
685 }
686
687 info.space_id = space_id;
688 info.function = function;
689 info.reg_run_count = 0;
690
691 ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES,
692 " Running _REG methods for SpaceId %s\n",
693 acpi_ut_get_region_name(info.space_id)));
694
695 /*
696 * Run all _REG methods for all Operation Regions for this space ID. This
697 * is a separate walk in order to handle any interdependencies between
698 * regions and _REG methods. (i.e. handlers must be installed for all
699 * regions of this Space ID before we can run any _REG methods)
700 */
701 (void)acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
702 ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run, NULL,
703 &info, NULL);
704
705 /*
706 * Special case for EC and GPIO: handle "orphan" _REG methods with
707 * no region.
708 */
709 if (space_id == ACPI_ADR_SPACE_EC || space_id == ACPI_ADR_SPACE_GPIO) {
710 acpi_ev_execute_orphan_reg_method(node, space_id);
711 }
712
713 ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES,
714 " Executed %u _REG methods for SpaceId %s\n",
715 info.reg_run_count,
716 acpi_ut_get_region_name(info.space_id)));
717
718 return_VOID;
719 }
720
721 /*******************************************************************************
722 *
723 * FUNCTION: acpi_ev_reg_run
724 *
725 * PARAMETERS: walk_namespace callback
726 *
727 * DESCRIPTION: Run _REG method for region objects of the requested spaceID
728 *
729 ******************************************************************************/
730
731 static acpi_status
acpi_ev_reg_run(acpi_handle obj_handle,u32 level,void * context,void ** return_value)732 acpi_ev_reg_run(acpi_handle obj_handle,
733 u32 level, void *context, void **return_value)
734 {
735 union acpi_operand_object *obj_desc;
736 struct acpi_namespace_node *node;
737 acpi_status status;
738 struct acpi_reg_walk_info *info;
739
740 info = ACPI_CAST_PTR(struct acpi_reg_walk_info, context);
741
742 /* Convert and validate the device handle */
743
744 node = acpi_ns_validate_handle(obj_handle);
745 if (!node) {
746 return (AE_BAD_PARAMETER);
747 }
748
749 /*
750 * We only care about regions and objects that are allowed to have
751 * address space handlers
752 */
753 if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
754 return (AE_OK);
755 }
756
757 /* Check for an existing internal object */
758
759 obj_desc = acpi_ns_get_attached_object(node);
760 if (!obj_desc) {
761
762 /* No object, just exit */
763
764 return (AE_OK);
765 }
766
767 /* Object is a Region */
768
769 if (obj_desc->region.space_id != info->space_id) {
770
771 /* This region is for a different address space, just ignore it */
772
773 return (AE_OK);
774 }
775
776 info->reg_run_count++;
777 status = acpi_ev_execute_reg_method(obj_desc, info->function);
778 return (status);
779 }
780
781 /*******************************************************************************
782 *
783 * FUNCTION: acpi_ev_execute_orphan_reg_method
784 *
785 * PARAMETERS: device_node - Namespace node for an ACPI device
786 * space_id - The address space ID
787 *
788 * RETURN: None
789 *
790 * DESCRIPTION: Execute an "orphan" _REG method that appears under an ACPI
791 * device. This is a _REG method that has no corresponding region
792 * within the device's scope. ACPI tables depending on these
793 * "orphan" _REG methods have been seen for both EC and GPIO
794 * Operation Regions. Presumably the Windows ACPI implementation
795 * always calls the _REG method independent of the presence of
796 * an actual Operation Region with the correct address space ID.
797 *
798 * MUTEX: Assumes the namespace is locked
799 *
800 ******************************************************************************/
801
802 static void
acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node * device_node,acpi_adr_space_type space_id)803 acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node *device_node,
804 acpi_adr_space_type space_id)
805 {
806 acpi_handle reg_method;
807 struct acpi_namespace_node *next_node;
808 acpi_status status;
809 struct acpi_object_list args;
810 union acpi_object objects[2];
811
812 ACPI_FUNCTION_TRACE(ev_execute_orphan_reg_method);
813
814 if (!device_node) {
815 return_VOID;
816 }
817
818 /* Namespace is currently locked, must release */
819
820 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
821
822 /* Get a handle to a _REG method immediately under the EC device */
823
824 status = acpi_get_handle(device_node, METHOD_NAME__REG, ®_method);
825 if (ACPI_FAILURE(status)) {
826 goto exit; /* There is no _REG method present */
827 }
828
829 /*
830 * Execute the _REG method only if there is no Operation Region in
831 * this scope with the Embedded Controller space ID. Otherwise, it
832 * will already have been executed. Note, this allows for Regions
833 * with other space IDs to be present; but the code below will then
834 * execute the _REG method with the embedded_control space_ID argument.
835 */
836 next_node = acpi_ns_get_next_node(device_node, NULL);
837 while (next_node) {
838 if ((next_node->type == ACPI_TYPE_REGION) &&
839 (next_node->object) &&
840 (next_node->object->region.space_id == space_id)) {
841 goto exit; /* Do not execute the _REG */
842 }
843
844 next_node = acpi_ns_get_next_node(device_node, next_node);
845 }
846
847 /* Evaluate the _REG(space_id,Connect) method */
848
849 args.count = 2;
850 args.pointer = objects;
851 objects[0].type = ACPI_TYPE_INTEGER;
852 objects[0].integer.value = space_id;
853 objects[1].type = ACPI_TYPE_INTEGER;
854 objects[1].integer.value = ACPI_REG_CONNECT;
855
856 (void)acpi_evaluate_object(reg_method, NULL, &args, NULL);
857
858 exit:
859 /* We ignore all errors from above, don't care */
860
861 (void)acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
862 return_VOID;
863 }
864