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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / acpi / acpica / nsaccess.c
blob07f672b5a1d1b3ed7352482cf5088da4d4466fd5
1 /*******************************************************************************
2 *
3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2018, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "amlcode.h"
47 #include "acnamesp.h"
48 #include "acdispat.h"
49
50 #ifdef ACPI_ASL_COMPILER
51 #include "acdisasm.h"
52 #endif
53
54 #define _COMPONENT ACPI_NAMESPACE
55 ACPI_MODULE_NAME("nsaccess")
56
57 /*******************************************************************************
58 *
59 * FUNCTION: acpi_ns_root_initialize
60 *
61 * PARAMETERS: None
62 *
63 * RETURN: Status
64 *
65 * DESCRIPTION: Allocate and initialize the default root named objects
66 *
67 * MUTEX: Locks namespace for entire execution
68 *
69 ******************************************************************************/
70 acpi_status acpi_ns_root_initialize(void)
71 {
72 acpi_status status;
73 const struct acpi_predefined_names *init_val = NULL;
74 struct acpi_namespace_node *new_node;
75 union acpi_operand_object *obj_desc;
76 acpi_string val = NULL;
77
78 ACPI_FUNCTION_TRACE(ns_root_initialize);
79
80 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
81 if (ACPI_FAILURE(status)) {
82 return_ACPI_STATUS(status);
83 }
84
85 /*
86 * The global root ptr is initially NULL, so a non-NULL value indicates
87 * that acpi_ns_root_initialize() has already been called; just return.
88 */
89 if (acpi_gbl_root_node) {
90 status = AE_OK;
91 goto unlock_and_exit;
92 }
93
94 /*
95 * Tell the rest of the subsystem that the root is initialized
96 * (This is OK because the namespace is locked)
97 */
98 acpi_gbl_root_node = &acpi_gbl_root_node_struct;
99
100 /* Enter the pre-defined names in the name table */
101
102 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
103 "Entering predefined entries into namespace\n"));
104
105 for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
106
107 /* _OSI is optional for now, will be permanent later */
108
109 if (!strcmp(init_val->name, "_OSI")
110 && !acpi_gbl_create_osi_method) {
111 continue;
112 }
113
114 status =
115 acpi_ns_lookup(NULL, ACPI_CAST_PTR(char, init_val->name),
116 init_val->type, ACPI_IMODE_LOAD_PASS2,
117 ACPI_NS_NO_UPSEARCH, NULL, &new_node);
118 if (ACPI_FAILURE(status)) {
119 ACPI_EXCEPTION((AE_INFO, status,
120 "Could not create predefined name %s",
121 init_val->name));
122 continue;
123 }
124
125 /*
126 * Name entered successfully. If entry in pre_defined_names[] specifies
127 * an initial value, create the initial value.
128 */
129 if (init_val->val) {
130 status = acpi_os_predefined_override(init_val, &val);
131 if (ACPI_FAILURE(status)) {
132 ACPI_ERROR((AE_INFO,
133 "Could not override predefined %s",
134 init_val->name));
135 }
136
137 if (!val) {
138 val = init_val->val;
139 }
140
141 /*
142 * Entry requests an initial value, allocate a
143 * descriptor for it.
144 */
145 obj_desc =
146 acpi_ut_create_internal_object(init_val->type);
147 if (!obj_desc) {
148 status = AE_NO_MEMORY;
149 goto unlock_and_exit;
150 }
151
152 /*
153 * Convert value string from table entry to
154 * internal representation. Only types actually
155 * used for initial values are implemented here.
156 */
157 switch (init_val->type) {
158 case ACPI_TYPE_METHOD:
159
160 obj_desc->method.param_count =
161 (u8) ACPI_TO_INTEGER(val);
162 obj_desc->common.flags |= AOPOBJ_DATA_VALID;
163
164 #if defined (ACPI_ASL_COMPILER)
165
166 /* Save the parameter count for the iASL compiler */
167
168 new_node->value = obj_desc->method.param_count;
169 #else
170 /* Mark this as a very SPECIAL method */
171
172 obj_desc->method.info_flags =
173 ACPI_METHOD_INTERNAL_ONLY;
174 obj_desc->method.dispatch.implementation =
175 acpi_ut_osi_implementation;
176 #endif
177 break;
178
179 case ACPI_TYPE_INTEGER:
180
181 obj_desc->integer.value = ACPI_TO_INTEGER(val);
182 break;
183
184 case ACPI_TYPE_STRING:
185
186 /* Build an object around the static string */
187
188 obj_desc->string.length = (u32)strlen(val);
189 obj_desc->string.pointer = val;
190 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
191 break;
192
193 case ACPI_TYPE_MUTEX:
194
195 obj_desc->mutex.node = new_node;
196 obj_desc->mutex.sync_level =
197 (u8) (ACPI_TO_INTEGER(val) - 1);
198
199 /* Create a mutex */
200
201 status =
202 acpi_os_create_mutex(&obj_desc->mutex.
203 os_mutex);
204 if (ACPI_FAILURE(status)) {
205 acpi_ut_remove_reference(obj_desc);
206 goto unlock_and_exit;
207 }
208
209 /* Special case for ACPI Global Lock */
210
211 if (strcmp(init_val->name, "_GL_") == 0) {
212 acpi_gbl_global_lock_mutex = obj_desc;
213
214 /* Create additional counting semaphore for global lock */
215
216 status =
217 acpi_os_create_semaphore(1, 0,
218 &acpi_gbl_global_lock_semaphore);
219 if (ACPI_FAILURE(status)) {
220 acpi_ut_remove_reference
221 (obj_desc);
222 goto unlock_and_exit;
223 }
224 }
225 break;
226
227 default:
228
229 ACPI_ERROR((AE_INFO,
230 "Unsupported initial type value 0x%X",
231 init_val->type));
232 acpi_ut_remove_reference(obj_desc);
233 obj_desc = NULL;
234 continue;
235 }
236
237 /* Store pointer to value descriptor in the Node */
238
239 status = acpi_ns_attach_object(new_node, obj_desc,
240 obj_desc->common.type);
241
242 /* Remove local reference to the object */
243
244 acpi_ut_remove_reference(obj_desc);
245 }
246 }
247
248 unlock_and_exit:
249 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
250
251 /* Save a handle to "_GPE", it is always present */
252
253 if (ACPI_SUCCESS(status)) {
254 status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
255 &acpi_gbl_fadt_gpe_device);
256 }
257
258 return_ACPI_STATUS(status);
259 }
260
261 /*******************************************************************************
262 *
263 * FUNCTION: acpi_ns_lookup
264 *
265 * PARAMETERS: scope_info - Current scope info block
266 * pathname - Search pathname, in internal format
267 * (as represented in the AML stream)
268 * type - Type associated with name
269 * interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
270 * flags - Flags describing the search restrictions
271 * walk_state - Current state of the walk
272 * return_node - Where the Node is placed (if found
273 * or created successfully)
274 *
275 * RETURN: Status
276 *
277 * DESCRIPTION: Find or enter the passed name in the name space.
278 * Log an error if name not found in Exec mode.
279 *
280 * MUTEX: Assumes namespace is locked.
281 *
282 ******************************************************************************/
283
284 acpi_status
285 acpi_ns_lookup(union acpi_generic_state *scope_info,
286 char *pathname,
287 acpi_object_type type,
288 acpi_interpreter_mode interpreter_mode,
289 u32 flags,
290 struct acpi_walk_state *walk_state,
291 struct acpi_namespace_node **return_node)
292 {
293 acpi_status status;
294 char *path = pathname;
295 char *external_path;
296 struct acpi_namespace_node *prefix_node;
297 struct acpi_namespace_node *current_node = NULL;
298 struct acpi_namespace_node *this_node = NULL;
299 u32 num_segments;
300 u32 num_carats;
301 acpi_name simple_name;
302 acpi_object_type type_to_check_for;
303 acpi_object_type this_search_type;
304 u32 search_parent_flag = ACPI_NS_SEARCH_PARENT;
305 u32 local_flags;
306
307 ACPI_FUNCTION_TRACE(ns_lookup);
308
309 if (!return_node) {
310 return_ACPI_STATUS(AE_BAD_PARAMETER);
311 }
312
313 local_flags = flags &
314 ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND |
315 ACPI_NS_SEARCH_PARENT);
316 *return_node = ACPI_ENTRY_NOT_FOUND;
317 acpi_gbl_ns_lookup_count++;
318
319 if (!acpi_gbl_root_node) {
320 return_ACPI_STATUS(AE_NO_NAMESPACE);
321 }
322
323 /* Get the prefix scope. A null scope means use the root scope */
324
325 if ((!scope_info) || (!scope_info->scope.node)) {
326 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
327 "Null scope prefix, using root node (%p)\n",
328 acpi_gbl_root_node));
329
330 prefix_node = acpi_gbl_root_node;
331 } else {
332 prefix_node = scope_info->scope.node;
333 if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
334 ACPI_DESC_TYPE_NAMED) {
335 ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
336 prefix_node,
337 acpi_ut_get_descriptor_name(prefix_node)));
338 return_ACPI_STATUS(AE_AML_INTERNAL);
339 }
340
341 if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) {
342 /*
343 * This node might not be a actual "scope" node (such as a
344 * Device/Method, etc.) It could be a Package or other object
345 * node. Backup up the tree to find the containing scope node.
346 */
347 while (!acpi_ns_opens_scope(prefix_node->type) &&
348 prefix_node->type != ACPI_TYPE_ANY) {
349 prefix_node = prefix_node->parent;
350 }
351 }
352 }
353
354 /* Save type. TBD: may be no longer necessary */
355
356 type_to_check_for = type;
357
358 /*
359 * Begin examination of the actual pathname
360 */
361 if (!pathname) {
362
363 /* A Null name_path is allowed and refers to the root */
364
365 num_segments = 0;
366 this_node = acpi_gbl_root_node;
367 path = "";
368
369 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
370 "Null Pathname (Zero segments), Flags=%X\n",
371 flags));
372 } else {
373 /*
374 * Name pointer is valid (and must be in internal name format)
375 *
376 * Check for scope prefixes:
377 *
378 * As represented in the AML stream, a namepath consists of an
379 * optional scope prefix followed by a name segment part.
380 *
381 * If present, the scope prefix is either a Root Prefix (in
382 * which case the name is fully qualified), or one or more
383 * Parent Prefixes (in which case the name's scope is relative
384 * to the current scope).
385 */
386 if (*path == (u8) AML_ROOT_PREFIX) {
387
388 /* Pathname is fully qualified, start from the root */
389
390 this_node = acpi_gbl_root_node;
391 search_parent_flag = ACPI_NS_NO_UPSEARCH;
392
393 /* Point to name segment part */
394
395 path++;
396
397 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
398 "Path is absolute from root [%p]\n",
399 this_node));
400 } else {
401 /* Pathname is relative to current scope, start there */
402
403 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
404 "Searching relative to prefix scope [%4.4s] (%p)\n",
405 acpi_ut_get_node_name(prefix_node),
406 prefix_node));
407
408 /*
409 * Handle multiple Parent Prefixes (carat) by just getting
410 * the parent node for each prefix instance.
411 */
412 this_node = prefix_node;
413 num_carats = 0;
414 while (*path == (u8) AML_PARENT_PREFIX) {
415
416 /* Name is fully qualified, no search rules apply */
417
418 search_parent_flag = ACPI_NS_NO_UPSEARCH;
419
420 /*
421 * Point past this prefix to the name segment
422 * part or the next Parent Prefix
423 */
424 path++;
425
426 /* Backup to the parent node */
427
428 num_carats++;
429 this_node = this_node->parent;
430 if (!this_node) {
431 /*
432 * Current scope has no parent scope. Externalize
433 * the internal path for error message.
434 */
435 status =
436 acpi_ns_externalize_name
437 (ACPI_UINT32_MAX, pathname, NULL,
438 &external_path);
439 if (ACPI_SUCCESS(status)) {
440 ACPI_ERROR((AE_INFO,
441 "%s: Path has too many parent prefixes (^)",
442 external_path));
443
444 ACPI_FREE(external_path);
445 }
446
447 return_ACPI_STATUS(AE_NOT_FOUND);
448 }
449 }
450
451 if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
452 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
453 "Search scope is [%4.4s], path has %u carat(s)\n",
454 acpi_ut_get_node_name
455 (this_node), num_carats));
456 }
457 }
458
459 /*
460 * Determine the number of ACPI name segments in this pathname.
461 *
462 * The segment part consists of either:
463 * - A Null name segment (0)
464 * - A dual_name_prefix followed by two 4-byte name segments
465 * - A multi_name_prefix followed by a byte indicating the
466 * number of segments and the segments themselves.
467 * - A single 4-byte name segment
468 *
469 * Examine the name prefix opcode, if any, to determine the number of
470 * segments.
471 */
472 switch (*path) {
473 case 0:
474 /*
475 * Null name after a root or parent prefixes. We already
476 * have the correct target node and there are no name segments.
477 */
478 num_segments = 0;
479 type = this_node->type;
480
481 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
482 "Prefix-only Pathname (Zero name segments), Flags=%X\n",
483 flags));
484 break;
485
486 case AML_DUAL_NAME_PREFIX:
487
488 /* More than one name_seg, search rules do not apply */
489
490 search_parent_flag = ACPI_NS_NO_UPSEARCH;
491
492 /* Two segments, point to first name segment */
493
494 num_segments = 2;
495 path++;
496
497 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
498 "Dual Pathname (2 segments, Flags=%X)\n",
499 flags));
500 break;
501
502 case AML_MULTI_NAME_PREFIX:
503
504 /* More than one name_seg, search rules do not apply */
505
506 search_parent_flag = ACPI_NS_NO_UPSEARCH;
507
508 /* Extract segment count, point to first name segment */
509
510 path++;
511 num_segments = (u32) (u8) * path;
512 path++;
513
514 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
515 "Multi Pathname (%u Segments, Flags=%X)\n",
516 num_segments, flags));
517 break;
518
519 default:
520 /*
521 * Not a Null name, no Dual or Multi prefix, hence there is
522 * only one name segment and Pathname is already pointing to it.
523 */
524 num_segments = 1;
525
526 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
527 "Simple Pathname (1 segment, Flags=%X)\n",
528 flags));
529 break;
530 }
531
532 ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
533 }
534
535 /*
536 * Search namespace for each segment of the name. Loop through and
537 * verify (or add to the namespace) each name segment.
538 *
539 * The object type is significant only at the last name
540 * segment. (We don't care about the types along the path, only
541 * the type of the final target object.)
542 */
543 this_search_type = ACPI_TYPE_ANY;
544 current_node = this_node;
545 while (num_segments && current_node) {
546 num_segments--;
547 if (!num_segments) {
548
549 /* This is the last segment, enable typechecking */
550
551 this_search_type = type;
552
553 /*
554 * Only allow automatic parent search (search rules) if the caller
555 * requested it AND we have a single, non-fully-qualified name_seg
556 */
557 if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
558 (flags & ACPI_NS_SEARCH_PARENT)) {
559 local_flags |= ACPI_NS_SEARCH_PARENT;
560 }
561
562 /* Set error flag according to caller */
563
564 if (flags & ACPI_NS_ERROR_IF_FOUND) {
565 local_flags |= ACPI_NS_ERROR_IF_FOUND;
566 }
567
568 /* Set override flag according to caller */
569
570 if (flags & ACPI_NS_OVERRIDE_IF_FOUND) {
571 local_flags |= ACPI_NS_OVERRIDE_IF_FOUND;
572 }
573 }
574
575 /* Extract one ACPI name from the front of the pathname */
576
577 ACPI_MOVE_32_TO_32(&simple_name, path);
578
579 /* Try to find the single (4 character) ACPI name */
580
581 status =
582 acpi_ns_search_and_enter(simple_name, walk_state,
583 current_node, interpreter_mode,
584 this_search_type, local_flags,
585 &this_node);
586 if (ACPI_FAILURE(status)) {
587 if (status == AE_NOT_FOUND) {
588
589 /* Name not found in ACPI namespace */
590
591 ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
592 "Name [%4.4s] not found in scope [%4.4s] %p\n",
593 (char *)&simple_name,
594 (char *)&current_node->name,
595 current_node));
596 }
597 #ifdef ACPI_ASL_COMPILER
598 /*
599 * If this ACPI name already exists within the namespace as an
600 * external declaration, then mark the external as a conflicting
601 * declaration and proceed to process the current node as if it did
602 * not exist in the namespace. If this node is not processed as
603 * normal, then it could cause improper namespace resolution
604 * by failing to open a new scope.
605 */
606 if (acpi_gbl_disasm_flag &&
607 (status == AE_ALREADY_EXISTS) &&
608 ((this_node->flags & ANOBJ_IS_EXTERNAL) ||
609 (walk_state
610 && walk_state->opcode == AML_EXTERNAL_OP))) {
611 this_node->flags &= ~ANOBJ_IS_EXTERNAL;
612 this_node->type = (u8)this_search_type;
613 if (walk_state->opcode != AML_EXTERNAL_OP) {
614 acpi_dm_mark_external_conflict
615 (this_node);
616 }
617 break;
618 }
619 #endif
620
621 *return_node = this_node;
622 return_ACPI_STATUS(status);
623 }
624
625 /* More segments to follow? */
626
627 if (num_segments > 0) {
628 /*
629 * If we have an alias to an object that opens a scope (such as a
630 * device or processor), we need to dereference the alias here so
631 * that we can access any children of the original node (via the
632 * remaining segments).
633 */
634 if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) {
635 if (!this_node->object) {
636 return_ACPI_STATUS(AE_NOT_EXIST);
637 }
638
639 if (acpi_ns_opens_scope
640 (((struct acpi_namespace_node *)
641 this_node->object)->type)) {
642 this_node =
643 (struct acpi_namespace_node *)
644 this_node->object;
645 }
646 }
647 }
648
649 /* Special handling for the last segment (num_segments == 0) */
650
651 else {
652 #ifdef ACPI_ASL_COMPILER
653 if (!acpi_gbl_disasm_flag
654 && (this_node->flags & ANOBJ_IS_EXTERNAL)) {
655 this_node->flags &= ~IMPLICIT_EXTERNAL;
656 }
657 #endif
658
659 /*
660 * Sanity typecheck of the target object:
661 *
662 * If 1) This is the last segment (num_segments == 0)
663 * 2) And we are looking for a specific type
664 * (Not checking for TYPE_ANY)
665 * 3) Which is not an alias
666 * 4) Which is not a local type (TYPE_SCOPE)
667 * 5) And the type of target object is known (not TYPE_ANY)
668 * 6) And target object does not match what we are looking for
669 *
670 * Then we have a type mismatch. Just warn and ignore it.
671 */
672 if ((type_to_check_for != ACPI_TYPE_ANY) &&
673 (type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) &&
674 (type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS)
675 && (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE)
676 && (this_node->type != ACPI_TYPE_ANY)
677 && (this_node->type != type_to_check_for)) {
678
679 /* Complain about a type mismatch */
680
681 ACPI_WARNING((AE_INFO,
682 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
683 ACPI_CAST_PTR(char, &simple_name),
684 acpi_ut_get_type_name(this_node->
685 type),
686 acpi_ut_get_type_name
687 (type_to_check_for)));
688 }
689
690 /*
691 * If this is the last name segment and we are not looking for a
692 * specific type, but the type of found object is known, use that
693 * type to (later) see if it opens a scope.
694 */
695 if (type == ACPI_TYPE_ANY) {
696 type = this_node->type;
697 }
698 }
699
700 /* Point to next name segment and make this node current */
701
702 path += ACPI_NAME_SIZE;
703 current_node = this_node;
704 }
705
706 /* Always check if we need to open a new scope */
707
708 if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
709 /*
710 * If entry is a type which opens a scope, push the new scope on the
711 * scope stack.
712 */
713 if (acpi_ns_opens_scope(type)) {
714 status =
715 acpi_ds_scope_stack_push(this_node, type,
716 walk_state);
717 if (ACPI_FAILURE(status)) {
718 return_ACPI_STATUS(status);
719 }
720 }
721 }
722
723 *return_node = this_node;
724 return_ACPI_STATUS(AE_OK);
725 }
CRIS linux kernel tree