1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: nsinit - namespace initialization
5 *
6 * Copyright (C) 2000 - 2018, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acnamesp.h"
13 #include "acdispat.h"
14 #include "acinterp.h"
15 #include "acevents.h"
16
17 #define _COMPONENT ACPI_NAMESPACE
18 ACPI_MODULE_NAME("nsinit")
19
20 /* Local prototypes */
21 static acpi_status
22 acpi_ns_init_one_object(acpi_handle obj_handle,
23 u32 level, void *context, void **return_value);
24
25 static acpi_status
26 acpi_ns_init_one_device(acpi_handle obj_handle,
27 u32 nesting_level, void *context, void **return_value);
28
29 static acpi_status
30 acpi_ns_find_ini_methods(acpi_handle obj_handle,
31 u32 nesting_level, void *context, void **return_value);
32
33 /*******************************************************************************
34 *
35 * FUNCTION: acpi_ns_initialize_objects
36 *
37 * PARAMETERS: None
38 *
39 * RETURN: Status
40 *
41 * DESCRIPTION: Walk the entire namespace and perform any necessary
42 * initialization on the objects found therein
43 *
44 ******************************************************************************/
45
acpi_ns_initialize_objects(void)46 acpi_status acpi_ns_initialize_objects(void)
47 {
48 acpi_status status;
49 struct acpi_init_walk_info info;
50
51 ACPI_FUNCTION_TRACE(ns_initialize_objects);
52
53 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
54 "[Init] Completing Initialization of ACPI Objects\n"));
55 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
56 "**** Starting initialization of namespace objects ****\n"));
57 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
58 "Completing Region/Field/Buffer/Package initialization:\n"));
59
60 /* Set all init info to zero */
61
62 memset(&info, 0, sizeof(struct acpi_init_walk_info));
63
64 /* Walk entire namespace from the supplied root */
65
66 status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
67 ACPI_UINT32_MAX, acpi_ns_init_one_object,
68 NULL, &info, NULL);
69 if (ACPI_FAILURE(status)) {
70 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
71 }
72
73 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
74 " Initialized %u/%u Regions %u/%u Fields %u/%u "
75 "Buffers %u/%u Packages (%u nodes)\n",
76 info.op_region_init, info.op_region_count,
77 info.field_init, info.field_count,
78 info.buffer_init, info.buffer_count,
79 info.package_init, info.package_count,
80 info.object_count));
81
82 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
83 "%u Control Methods found\n%u Op Regions found\n",
84 info.method_count, info.op_region_count));
85
86 return_ACPI_STATUS(AE_OK);
87 }
88
89 /*******************************************************************************
90 *
91 * FUNCTION: acpi_ns_initialize_devices
92 *
93 * PARAMETERS: None
94 *
95 * RETURN: acpi_status
96 *
97 * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
98 * This means running _INI on all present devices.
99 *
100 * Note: We install PCI config space handler on region access,
101 * not here.
102 *
103 ******************************************************************************/
104
acpi_ns_initialize_devices(u32 flags)105 acpi_status acpi_ns_initialize_devices(u32 flags)
106 {
107 acpi_status status = AE_OK;
108 struct acpi_device_walk_info info;
109 acpi_handle handle;
110
111 ACPI_FUNCTION_TRACE(ns_initialize_devices);
112
113 if (!(flags & ACPI_NO_DEVICE_INIT)) {
114 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
115 "[Init] Initializing ACPI Devices\n"));
116
117 /* Init counters */
118
119 info.device_count = 0;
120 info.num_STA = 0;
121 info.num_INI = 0;
122
123 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
124 "Initializing Device/Processor/Thermal objects "
125 "and executing _INI/_STA methods:\n"));
126
127 /* Tree analysis: find all subtrees that contain _INI methods */
128
129 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
130 ACPI_UINT32_MAX, FALSE,
131 acpi_ns_find_ini_methods, NULL,
132 &info, NULL);
133 if (ACPI_FAILURE(status)) {
134 goto error_exit;
135 }
136
137 /* Allocate the evaluation information block */
138
139 info.evaluate_info =
140 ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
141 if (!info.evaluate_info) {
142 status = AE_NO_MEMORY;
143 goto error_exit;
144 }
145
146 /*
147 * Execute the "global" _INI method that may appear at the root.
148 * This support is provided for Windows compatibility (Vista+) and
149 * is not part of the ACPI specification.
150 */
151 info.evaluate_info->prefix_node = acpi_gbl_root_node;
152 info.evaluate_info->relative_pathname = METHOD_NAME__INI;
153 info.evaluate_info->parameters = NULL;
154 info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;
155
156 status = acpi_ns_evaluate(info.evaluate_info);
157 if (ACPI_SUCCESS(status)) {
158 info.num_INI++;
159 }
160
161 /*
162 * Execute \_SB._INI.
163 * There appears to be a strict order requirement for \_SB._INI,
164 * which should be evaluated before any _REG evaluations.
165 */
166 status = acpi_get_handle(NULL, "\\_SB", &handle);
167 if (ACPI_SUCCESS(status)) {
168 memset(info.evaluate_info, 0,
169 sizeof(struct acpi_evaluate_info));
170 info.evaluate_info->prefix_node = handle;
171 info.evaluate_info->relative_pathname =
172 METHOD_NAME__INI;
173 info.evaluate_info->parameters = NULL;
174 info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE;
175
176 status = acpi_ns_evaluate(info.evaluate_info);
177 if (ACPI_SUCCESS(status)) {
178 info.num_INI++;
179 }
180 }
181 }
182
183 /*
184 * Run all _REG methods
185 *
186 * Note: Any objects accessed by the _REG methods will be automatically
187 * initialized, even if they contain executable AML (see the call to
188 * acpi_ns_initialize_objects below).
189 *
190 * Note: According to the ACPI specification, we actually needn't execute
191 * _REG for system_memory/system_io operation regions, but for PCI_Config
192 * operation regions, it is required to evaluate _REG for those on a PCI
193 * root bus that doesn't contain _BBN object. So this code is kept here
194 * in order not to break things.
195 */
196 if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
197 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
198 "[Init] Executing _REG OpRegion methods\n"));
199
200 status = acpi_ev_initialize_op_regions();
201 if (ACPI_FAILURE(status)) {
202 goto error_exit;
203 }
204 }
205
206 if (!(flags & ACPI_NO_DEVICE_INIT)) {
207
208 /* Walk namespace to execute all _INIs on present devices */
209
210 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
211 ACPI_UINT32_MAX, FALSE,
212 acpi_ns_init_one_device, NULL,
213 &info, NULL);
214
215 /*
216 * Any _OSI requests should be completed by now. If the BIOS has
217 * requested any Windows OSI strings, we will always truncate
218 * I/O addresses to 16 bits -- for Windows compatibility.
219 */
220 if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) {
221 acpi_gbl_truncate_io_addresses = TRUE;
222 }
223
224 ACPI_FREE(info.evaluate_info);
225 if (ACPI_FAILURE(status)) {
226 goto error_exit;
227 }
228
229 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
230 " Executed %u _INI methods requiring %u _STA executions "
231 "(examined %u objects)\n",
232 info.num_INI, info.num_STA,
233 info.device_count));
234 }
235
236 return_ACPI_STATUS(status);
237
238 error_exit:
239 ACPI_EXCEPTION((AE_INFO, status, "During device initialization"));
240 return_ACPI_STATUS(status);
241 }
242
243 /*******************************************************************************
244 *
245 * FUNCTION: acpi_ns_init_one_package
246 *
247 * PARAMETERS: obj_handle - Node
248 * level - Current nesting level
249 * context - Not used
250 * return_value - Not used
251 *
252 * RETURN: Status
253 *
254 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every package
255 * within the namespace. Used during dynamic load of an SSDT.
256 *
257 ******************************************************************************/
258
259 acpi_status
acpi_ns_init_one_package(acpi_handle obj_handle,u32 level,void * context,void ** return_value)260 acpi_ns_init_one_package(acpi_handle obj_handle,
261 u32 level, void *context, void **return_value)
262 {
263 acpi_status status;
264 union acpi_operand_object *obj_desc;
265 struct acpi_namespace_node *node =
266 (struct acpi_namespace_node *)obj_handle;
267
268 obj_desc = acpi_ns_get_attached_object(node);
269 if (!obj_desc) {
270 return (AE_OK);
271 }
272
273 /* Exit if package is already initialized */
274
275 if (obj_desc->package.flags & AOPOBJ_DATA_VALID) {
276 return (AE_OK);
277 }
278
279 status = acpi_ds_get_package_arguments(obj_desc);
280 if (ACPI_FAILURE(status)) {
281 return (AE_OK);
282 }
283
284 status =
285 acpi_ut_walk_package_tree(obj_desc, NULL,
286 acpi_ds_init_package_element, NULL);
287 if (ACPI_FAILURE(status)) {
288 return (AE_OK);
289 }
290
291 obj_desc->package.flags |= AOPOBJ_DATA_VALID;
292 return (AE_OK);
293 }
294
295 /*******************************************************************************
296 *
297 * FUNCTION: acpi_ns_init_one_object
298 *
299 * PARAMETERS: obj_handle - Node
300 * level - Current nesting level
301 * context - Points to a init info struct
302 * return_value - Not used
303 *
304 * RETURN: Status
305 *
306 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
307 * within the namespace.
308 *
309 * Currently, the only objects that require initialization are:
310 * 1) Methods
311 * 2) Op Regions
312 *
313 ******************************************************************************/
314
315 static acpi_status
acpi_ns_init_one_object(acpi_handle obj_handle,u32 level,void * context,void ** return_value)316 acpi_ns_init_one_object(acpi_handle obj_handle,
317 u32 level, void *context, void **return_value)
318 {
319 acpi_object_type type;
320 acpi_status status = AE_OK;
321 struct acpi_init_walk_info *info =
322 (struct acpi_init_walk_info *)context;
323 struct acpi_namespace_node *node =
324 (struct acpi_namespace_node *)obj_handle;
325 union acpi_operand_object *obj_desc;
326
327 ACPI_FUNCTION_NAME(ns_init_one_object);
328
329 info->object_count++;
330
331 /* And even then, we are only interested in a few object types */
332
333 type = acpi_ns_get_type(obj_handle);
334 obj_desc = acpi_ns_get_attached_object(node);
335 if (!obj_desc) {
336 return (AE_OK);
337 }
338
339 /* Increment counters for object types we are looking for */
340
341 switch (type) {
342 case ACPI_TYPE_REGION:
343
344 info->op_region_count++;
345 break;
346
347 case ACPI_TYPE_BUFFER_FIELD:
348
349 info->field_count++;
350 break;
351
352 case ACPI_TYPE_LOCAL_BANK_FIELD:
353
354 info->field_count++;
355 break;
356
357 case ACPI_TYPE_BUFFER:
358
359 info->buffer_count++;
360 break;
361
362 case ACPI_TYPE_PACKAGE:
363
364 info->package_count++;
365 break;
366
367 default:
368
369 /* No init required, just exit now */
370
371 return (AE_OK);
372 }
373
374 /* If the object is already initialized, nothing else to do */
375
376 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
377 return (AE_OK);
378 }
379
380 /* Must lock the interpreter before executing AML code */
381
382 acpi_ex_enter_interpreter();
383
384 /*
385 * Each of these types can contain executable AML code within the
386 * declaration.
387 */
388 switch (type) {
389 case ACPI_TYPE_REGION:
390
391 info->op_region_init++;
392 status = acpi_ds_get_region_arguments(obj_desc);
393 break;
394
395 case ACPI_TYPE_BUFFER_FIELD:
396
397 info->field_init++;
398 status = acpi_ds_get_buffer_field_arguments(obj_desc);
399 break;
400
401 case ACPI_TYPE_LOCAL_BANK_FIELD:
402
403 info->field_init++;
404 status = acpi_ds_get_bank_field_arguments(obj_desc);
405 break;
406
407 case ACPI_TYPE_BUFFER:
408
409 info->buffer_init++;
410 status = acpi_ds_get_buffer_arguments(obj_desc);
411 break;
412
413 case ACPI_TYPE_PACKAGE:
414
415 /* Complete the initialization/resolution of the package object */
416
417 info->package_init++;
418 status =
419 acpi_ns_init_one_package(obj_handle, level, NULL, NULL);
420 break;
421
422 default:
423
424 /* No other types can get here */
425
426 break;
427 }
428
429 if (ACPI_FAILURE(status)) {
430 ACPI_EXCEPTION((AE_INFO, status,
431 "Could not execute arguments for [%4.4s] (%s)",
432 acpi_ut_get_node_name(node),
433 acpi_ut_get_type_name(type)));
434 }
435
436 /*
437 * We ignore errors from above, and always return OK, since we don't want
438 * to abort the walk on any single error.
439 */
440 acpi_ex_exit_interpreter();
441 return (AE_OK);
442 }
443
444 /*******************************************************************************
445 *
446 * FUNCTION: acpi_ns_find_ini_methods
447 *
448 * PARAMETERS: acpi_walk_callback
449 *
450 * RETURN: acpi_status
451 *
452 * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
453 * device/processor/thermal objects, and marks the entire subtree
454 * with a SUBTREE_HAS_INI flag. This flag is used during the
455 * subsequent device initialization walk to avoid entire subtrees
456 * that do not contain an _INI.
457 *
458 ******************************************************************************/
459
460 static acpi_status
acpi_ns_find_ini_methods(acpi_handle obj_handle,u32 nesting_level,void * context,void ** return_value)461 acpi_ns_find_ini_methods(acpi_handle obj_handle,
462 u32 nesting_level, void *context, void **return_value)
463 {
464 struct acpi_device_walk_info *info =
465 ACPI_CAST_PTR(struct acpi_device_walk_info, context);
466 struct acpi_namespace_node *node;
467 struct acpi_namespace_node *parent_node;
468
469 /* Keep count of device/processor/thermal objects */
470
471 node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
472 if ((node->type == ACPI_TYPE_DEVICE) ||
473 (node->type == ACPI_TYPE_PROCESSOR) ||
474 (node->type == ACPI_TYPE_THERMAL)) {
475 info->device_count++;
476 return (AE_OK);
477 }
478
479 /* We are only looking for methods named _INI */
480
481 if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) {
482 return (AE_OK);
483 }
484
485 /*
486 * The only _INI methods that we care about are those that are
487 * present under Device, Processor, and Thermal objects.
488 */
489 parent_node = node->parent;
490 switch (parent_node->type) {
491 case ACPI_TYPE_DEVICE:
492 case ACPI_TYPE_PROCESSOR:
493 case ACPI_TYPE_THERMAL:
494
495 /* Mark parent and bubble up the INI present flag to the root */
496
497 while (parent_node) {
498 parent_node->flags |= ANOBJ_SUBTREE_HAS_INI;
499 parent_node = parent_node->parent;
500 }
501 break;
502
503 default:
504
505 break;
506 }
507
508 return (AE_OK);
509 }
510
511 /*******************************************************************************
512 *
513 * FUNCTION: acpi_ns_init_one_device
514 *
515 * PARAMETERS: acpi_walk_callback
516 *
517 * RETURN: acpi_status
518 *
519 * DESCRIPTION: This is called once per device soon after ACPI is enabled
520 * to initialize each device. It determines if the device is
521 * present, and if so, calls _INI.
522 *
523 ******************************************************************************/
524
525 static acpi_status
acpi_ns_init_one_device(acpi_handle obj_handle,u32 nesting_level,void * context,void ** return_value)526 acpi_ns_init_one_device(acpi_handle obj_handle,
527 u32 nesting_level, void *context, void **return_value)
528 {
529 struct acpi_device_walk_info *walk_info =
530 ACPI_CAST_PTR(struct acpi_device_walk_info, context);
531 struct acpi_evaluate_info *info = walk_info->evaluate_info;
532 u32 flags;
533 acpi_status status;
534 struct acpi_namespace_node *device_node;
535
536 ACPI_FUNCTION_TRACE(ns_init_one_device);
537
538 /* We are interested in Devices, Processors and thermal_zones only */
539
540 device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
541 if ((device_node->type != ACPI_TYPE_DEVICE) &&
542 (device_node->type != ACPI_TYPE_PROCESSOR) &&
543 (device_node->type != ACPI_TYPE_THERMAL)) {
544 return_ACPI_STATUS(AE_OK);
545 }
546
547 /*
548 * Because of an earlier namespace analysis, all subtrees that contain an
549 * _INI method are tagged.
550 *
551 * If this device subtree does not contain any _INI methods, we
552 * can exit now and stop traversing this entire subtree.
553 */
554 if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) {
555 return_ACPI_STATUS(AE_CTRL_DEPTH);
556 }
557
558 /*
559 * Run _STA to determine if this device is present and functioning. We
560 * must know this information for two important reasons (from ACPI spec):
561 *
562 * 1) We can only run _INI if the device is present.
563 * 2) We must abort the device tree walk on this subtree if the device is
564 * not present and is not functional (we will not examine the children)
565 *
566 * The _STA method is not required to be present under the device, we
567 * assume the device is present if _STA does not exist.
568 */
569 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
570 (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA));
571
572 status = acpi_ut_execute_STA(device_node, &flags);
573 if (ACPI_FAILURE(status)) {
574
575 /* Ignore error and move on to next device */
576
577 return_ACPI_STATUS(AE_OK);
578 }
579
580 /*
581 * Flags == -1 means that _STA was not found. In this case, we assume that
582 * the device is both present and functional.
583 *
584 * From the ACPI spec, description of _STA:
585 *
586 * "If a device object (including the processor object) does not have an
587 * _STA object, then OSPM assumes that all of the above bits are set (in
588 * other words, the device is present, ..., and functioning)"
589 */
590 if (flags != ACPI_UINT32_MAX) {
591 walk_info->num_STA++;
592 }
593
594 /*
595 * Examine the PRESENT and FUNCTIONING status bits
596 *
597 * Note: ACPI spec does not seem to specify behavior for the present but
598 * not functioning case, so we assume functioning if present.
599 */
600 if (!(flags & ACPI_STA_DEVICE_PRESENT)) {
601
602 /* Device is not present, we must examine the Functioning bit */
603
604 if (flags & ACPI_STA_DEVICE_FUNCTIONING) {
605 /*
606 * Device is not present but is "functioning". In this case,
607 * we will not run _INI, but we continue to examine the children
608 * of this device.
609 *
610 * From the ACPI spec, description of _STA: (note - no mention
611 * of whether to run _INI or not on the device in question)
612 *
613 * "_STA may return bit 0 clear (not present) with bit 3 set
614 * (device is functional). This case is used to indicate a valid
615 * device for which no device driver should be loaded (for example,
616 * a bridge device.) Children of this device may be present and
617 * valid. OSPM should continue enumeration below a device whose
618 * _STA returns this bit combination"
619 */
620 return_ACPI_STATUS(AE_OK);
621 } else {
622 /*
623 * Device is not present and is not functioning. We must abort the
624 * walk of this subtree immediately -- don't look at the children
625 * of such a device.
626 *
627 * From the ACPI spec, description of _INI:
628 *
629 * "If the _STA method indicates that the device is not present,
630 * OSPM will not run the _INI and will not examine the children
631 * of the device for _INI methods"
632 */
633 return_ACPI_STATUS(AE_CTRL_DEPTH);
634 }
635 }
636
637 /*
638 * The device is present or is assumed present if no _STA exists.
639 * Run the _INI if it exists (not required to exist)
640 *
641 * Note: We know there is an _INI within this subtree, but it may not be
642 * under this particular device, it may be lower in the branch.
643 */
644 if (!ACPI_COMPARE_NAME(device_node->name.ascii, "_SB_") ||
645 device_node->parent != acpi_gbl_root_node) {
646 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
647 (ACPI_TYPE_METHOD, device_node,
648 METHOD_NAME__INI));
649
650 memset(info, 0, sizeof(struct acpi_evaluate_info));
651 info->prefix_node = device_node;
652 info->relative_pathname = METHOD_NAME__INI;
653 info->parameters = NULL;
654 info->flags = ACPI_IGNORE_RETURN_VALUE;
655
656 status = acpi_ns_evaluate(info);
657 if (ACPI_SUCCESS(status)) {
658 walk_info->num_INI++;
659 }
660 #ifdef ACPI_DEBUG_OUTPUT
661 else if (status != AE_NOT_FOUND) {
662
663 /* Ignore error and move on to next device */
664
665 char *scope_name =
666 acpi_ns_get_normalized_pathname(device_node, TRUE);
667
668 ACPI_EXCEPTION((AE_INFO, status,
669 "during %s._INI execution",
670 scope_name));
671 ACPI_FREE(scope_name);
672 }
673 #endif
674 }
675
676 /* Ignore errors from above */
677
678 status = AE_OK;
679
680 /*
681 * The _INI method has been run if present; call the Global Initialization
682 * Handler for this device.
683 */
684 if (acpi_gbl_init_handler) {
685 status =
686 acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI);
687 }
688
689 return_ACPI_STATUS(status);
690 }
691