xref: /openbmc/linux/drivers/acpi/acpica/dsinit.c (revision 82003e04)
1 /******************************************************************************
2  *
3  * Module Name: dsinit - Object initialization namespace walk
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2016, 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 "acdispat.h"
47 #include "acnamesp.h"
48 #include "actables.h"
49 #include "acinterp.h"
50 
51 #define _COMPONENT          ACPI_DISPATCHER
52 ACPI_MODULE_NAME("dsinit")
53 
54 /* Local prototypes */
55 static acpi_status
56 acpi_ds_init_one_object(acpi_handle obj_handle,
57 			u32 level, void *context, void **return_value);
58 
59 /*******************************************************************************
60  *
61  * FUNCTION:    acpi_ds_init_one_object
62  *
63  * PARAMETERS:  obj_handle      - Node for the object
64  *              level           - Current nesting level
65  *              context         - Points to a init info struct
66  *              return_value    - Not used
67  *
68  * RETURN:      Status
69  *
70  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
71  *              within the namespace.
72  *
73  *              Currently, the only objects that require initialization are:
74  *              1) Methods
75  *              2) Operation Regions
76  *
77  ******************************************************************************/
78 
79 static acpi_status
80 acpi_ds_init_one_object(acpi_handle obj_handle,
81 			u32 level, void *context, void **return_value)
82 {
83 	struct acpi_init_walk_info *info =
84 	    (struct acpi_init_walk_info *)context;
85 	struct acpi_namespace_node *node =
86 	    (struct acpi_namespace_node *)obj_handle;
87 	acpi_status status;
88 	union acpi_operand_object *obj_desc;
89 
90 	ACPI_FUNCTION_ENTRY();
91 
92 	/*
93 	 * We are only interested in NS nodes owned by the table that
94 	 * was just loaded
95 	 */
96 	if (node->owner_id != info->owner_id) {
97 		return (AE_OK);
98 	}
99 
100 	info->object_count++;
101 
102 	/* And even then, we are only interested in a few object types */
103 
104 	switch (acpi_ns_get_type(obj_handle)) {
105 	case ACPI_TYPE_REGION:
106 
107 		status = acpi_ds_initialize_region(obj_handle);
108 		if (ACPI_FAILURE(status)) {
109 			ACPI_EXCEPTION((AE_INFO, status,
110 					"During Region initialization %p [%4.4s]",
111 					obj_handle,
112 					acpi_ut_get_node_name(obj_handle)));
113 		}
114 
115 		info->op_region_count++;
116 		break;
117 
118 	case ACPI_TYPE_METHOD:
119 		/*
120 		 * Auto-serialization support. We will examine each method that is
121 		 * not_serialized to determine if it creates any Named objects. If
122 		 * it does, it will be marked serialized to prevent problems if
123 		 * the method is entered by two or more threads and an attempt is
124 		 * made to create the same named object twice -- which results in
125 		 * an AE_ALREADY_EXISTS exception and method abort.
126 		 */
127 		info->method_count++;
128 		obj_desc = acpi_ns_get_attached_object(node);
129 		if (!obj_desc) {
130 			break;
131 		}
132 
133 		/* Ignore if already serialized */
134 
135 		if (obj_desc->method.info_flags & ACPI_METHOD_SERIALIZED) {
136 			info->serial_method_count++;
137 			break;
138 		}
139 
140 		if (acpi_gbl_auto_serialize_methods) {
141 
142 			/* Parse/scan method and serialize it if necessary */
143 
144 			acpi_ds_auto_serialize_method(node, obj_desc);
145 			if (obj_desc->method.
146 			    info_flags & ACPI_METHOD_SERIALIZED) {
147 
148 				/* Method was just converted to Serialized */
149 
150 				info->serial_method_count++;
151 				info->serialized_method_count++;
152 				break;
153 			}
154 		}
155 
156 		info->non_serial_method_count++;
157 		break;
158 
159 	case ACPI_TYPE_DEVICE:
160 
161 		info->device_count++;
162 		break;
163 
164 	default:
165 
166 		break;
167 	}
168 
169 	/*
170 	 * We ignore errors from above, and always return OK, since
171 	 * we don't want to abort the walk on a single error.
172 	 */
173 	return (AE_OK);
174 }
175 
176 /*******************************************************************************
177  *
178  * FUNCTION:    acpi_ds_initialize_objects
179  *
180  * PARAMETERS:  table_desc      - Descriptor for parent ACPI table
181  *              start_node      - Root of subtree to be initialized.
182  *
183  * RETURN:      Status
184  *
185  * DESCRIPTION: Walk the namespace starting at "StartNode" and perform any
186  *              necessary initialization on the objects found therein
187  *
188  ******************************************************************************/
189 
190 acpi_status
191 acpi_ds_initialize_objects(u32 table_index,
192 			   struct acpi_namespace_node *start_node)
193 {
194 	acpi_status status;
195 	struct acpi_init_walk_info info;
196 	struct acpi_table_header *table;
197 	acpi_owner_id owner_id;
198 
199 	ACPI_FUNCTION_TRACE(ds_initialize_objects);
200 
201 	status = acpi_tb_get_owner_id(table_index, &owner_id);
202 	if (ACPI_FAILURE(status)) {
203 		return_ACPI_STATUS(status);
204 	}
205 
206 	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
207 			  "**** Starting initialization of namespace objects ****\n"));
208 
209 	/* Set all init info to zero */
210 
211 	memset(&info, 0, sizeof(struct acpi_init_walk_info));
212 
213 	info.owner_id = owner_id;
214 	info.table_index = table_index;
215 
216 	/* Walk entire namespace from the supplied root */
217 
218 	/*
219 	 * We don't use acpi_walk_namespace since we do not want to acquire
220 	 * the namespace reader lock.
221 	 */
222 	status =
223 	    acpi_ns_walk_namespace(ACPI_TYPE_ANY, start_node, ACPI_UINT32_MAX,
224 				   0, acpi_ds_init_one_object, NULL, &info,
225 				   NULL);
226 	if (ACPI_FAILURE(status)) {
227 		ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
228 	}
229 
230 	status = acpi_get_table_by_index(table_index, &table);
231 	if (ACPI_FAILURE(status)) {
232 		return_ACPI_STATUS(status);
233 	}
234 
235 	/* DSDT is always the first AML table */
236 
237 	if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT)) {
238 		ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
239 				      "\nInitializing Namespace objects:\n"));
240 	}
241 
242 	/* Summary of objects initialized */
243 
244 	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
245 			      "Table [%4.4s: %-8.8s] (id %.2X) - %4u Objects with %3u Devices, "
246 			      "%3u Regions, %4u Methods (%u/%u/%u Serial/Non/Cvt)\n",
247 			      table->signature, table->oem_table_id, owner_id,
248 			      info.object_count, info.device_count,
249 			      info.op_region_count, info.method_count,
250 			      info.serial_method_count,
251 			      info.non_serial_method_count,
252 			      info.serialized_method_count));
253 
254 	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "%u Methods, %u Regions\n",
255 			  info.method_count, info.op_region_count));
256 
257 	return_ACPI_STATUS(AE_OK);
258 }
259