LXR linux/drivers/acpi/acpica/dsinit.c

   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 - 2021, 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(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);
 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(&info, 0, 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_node, ACPI_UINT32_MAX,
 190                                   ACPI_NS_WALK_NO_UNLOCK,
 191                                   acpi_ds_init_one_object, NULL, &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, &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