1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: dsinit - Object initialization namespace walk
5 *
6 * Copyright (C) 2000 - 2025, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12#include "acdispat.h"
13#include "acnamesp.h"
14#include "actables.h"
15#include "acinterp.h"
16
17#define _COMPONENT ACPI_DISPATCHER
18ACPI_MODULE_NAME("dsinit")
19
20/* Local prototypes */
21static acpi_status
22acpi_ds_init_one_object(acpi_handle obj_handle,
23 u32 level, void *context, void **return_value);
24
25/*******************************************************************************
26 *
27 * FUNCTION: acpi_ds_init_one_object
28 *
29 * PARAMETERS: obj_handle - Node for the object
30 * level - Current nesting level
31 * context - Points to a init info struct
32 * return_value - Not used
33 *
34 * RETURN: Status
35 *
36 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
37 * within the namespace.
38 *
39 * Currently, the only objects that require initialization are:
40 * 1) Methods
41 * 2) Operation Regions
42 *
43 ******************************************************************************/
44
45static acpi_status
46acpi_ds_init_one_object(acpi_handle obj_handle,
47 u32 level, void *context, void **return_value)
48{
49 struct acpi_init_walk_info *info =
50 (struct acpi_init_walk_info *)context;
51 struct acpi_namespace_node *node =
52 (struct acpi_namespace_node *)obj_handle;
53 acpi_status status;
54 union acpi_operand_object *obj_desc;
55
56 ACPI_FUNCTION_ENTRY();
57
58 /*
59 * We are only interested in NS nodes owned by the table that
60 * was just loaded
61 */
62 if (node->owner_id != info->owner_id) {
63 return (AE_OK);
64 }
65
66 info->object_count++;
67
68 /* And even then, we are only interested in a few object types */
69
70 switch (acpi_ns_get_type(node: obj_handle)) {
71 case ACPI_TYPE_REGION:
72
73 status = acpi_ds_initialize_region(obj_handle);
74 if (ACPI_FAILURE(status)) {
75 ACPI_EXCEPTION((AE_INFO, status,
76 "During Region initialization %p [%4.4s]",
77 obj_handle,
78 acpi_ut_get_node_name(obj_handle)));
79 }
80
81 info->op_region_count++;
82 break;
83
84 case ACPI_TYPE_METHOD:
85 /*
86 * Auto-serialization support. We will examine each method that is
87 * not_serialized to determine if it creates any Named objects. If
88 * it does, it will be marked serialized to prevent problems if
89 * the method is entered by two or more threads and an attempt is
90 * made to create the same named object twice -- which results in
91 * an AE_ALREADY_EXISTS exception and method abort.
92 */
93 info->method_count++;
94 obj_desc = acpi_ns_get_attached_object(node);
95 if (!obj_desc) {
96 break;
97 }
98
99 /* Ignore if already serialized */
100
101 if (obj_desc->method.info_flags & ACPI_METHOD_SERIALIZED) {
102 info->serial_method_count++;
103 break;
104 }
105
106 if (acpi_gbl_auto_serialize_methods) {
107
108 /* Parse/scan method and serialize it if necessary */
109
110 acpi_ds_auto_serialize_method(node, obj_desc);
111 if (obj_desc->method.
112 info_flags & ACPI_METHOD_SERIALIZED) {
113
114 /* Method was just converted to Serialized */
115
116 info->serial_method_count++;
117 info->serialized_method_count++;
118 break;
119 }
120 }
121
122 info->non_serial_method_count++;
123 break;
124
125 case ACPI_TYPE_DEVICE:
126
127 info->device_count++;
128 break;
129
130 default:
131
132 break;
133 }
134
135 /*
136 * We ignore errors from above, and always return OK, since
137 * we don't want to abort the walk on a single error.
138 */
139 return (AE_OK);
140}
141
142/*******************************************************************************
143 *
144 * FUNCTION: acpi_ds_initialize_objects
145 *
146 * PARAMETERS: table_desc - Descriptor for parent ACPI table
147 * start_node - Root of subtree to be initialized.
148 *
149 * RETURN: Status
150 *
151 * DESCRIPTION: Walk the namespace starting at "StartNode" and perform any
152 * necessary initialization on the objects found therein
153 *
154 ******************************************************************************/
155
156acpi_status
157acpi_ds_initialize_objects(u32 table_index,
158 struct acpi_namespace_node *start_node)
159{
160 acpi_status status;
161 struct acpi_init_walk_info info;
162 struct acpi_table_header *table;
163 acpi_owner_id owner_id;
164
165 ACPI_FUNCTION_TRACE(ds_initialize_objects);
166
167 status = acpi_tb_get_owner_id(table_index, owner_id: &owner_id);
168 if (ACPI_FAILURE(status)) {
169 return_ACPI_STATUS(status);
170 }
171
172 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
173 "**** Starting initialization of namespace objects ****\n"));
174
175 /* Set all init info to zero */
176
177 memset(s: &info, c: 0, n: sizeof(struct acpi_init_walk_info));
178
179 info.owner_id = owner_id;
180 info.table_index = table_index;
181
182 /* Walk entire namespace from the supplied root */
183
184 /*
185 * We don't use acpi_walk_namespace since we do not want to acquire
186 * the namespace reader lock.
187 */
188 status =
189 acpi_ns_walk_namespace(ACPI_TYPE_ANY, start_object: start_node, ACPI_UINT32_MAX,
190 ACPI_NS_WALK_NO_UNLOCK,
191 descending_callback: acpi_ds_init_one_object, NULL, context: &info, NULL);
192 if (ACPI_FAILURE(status)) {
193 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
194 }
195
196 status = acpi_get_table_by_index(table_index, out_table: &table);
197 if (ACPI_FAILURE(status)) {
198 return_ACPI_STATUS(status);
199 }
200
201 /* DSDT is always the first AML table */
202
203 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_DSDT)) {
204 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
205 "\nACPI table initialization:\n"));
206 }
207
208 /* Summary of objects initialized */
209
210 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
211 "Table [%4.4s: %-8.8s] (id %.2X) - %4u Objects with %3u Devices, "
212 "%3u Regions, %4u Methods (%u/%u/%u Serial/Non/Cvt)\n",
213 table->signature, table->oem_table_id, owner_id,
214 info.object_count, info.device_count,
215 info.op_region_count, info.method_count,
216 info.serial_method_count,
217 info.non_serial_method_count,
218 info.serialized_method_count));
219
220 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "%u Methods, %u Regions\n",
221 info.method_count, info.op_region_count));
222
223 return_ACPI_STATUS(AE_OK);
224}
225