drivers/acpi/acpica/dswscope.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: dswscope - Scope stack manipulation
   5  *
   6  * Copyright (C) 2000 - 2020, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #include <acpi/acpi.h>
  11 #include "accommon.h"
  12 #include "acdispat.h"
  13
  14 #define _COMPONENT          ACPI_DISPATCHER
  15 ACPI_MODULE_NAME("dswscope")
  16
  17 /****************************************************************************
  18  *
  19  * FUNCTION:    acpi_ds_scope_stack_clear
  20  *
  21  * PARAMETERS:  walk_state      - Current state
  22  *
  23  * RETURN:      None
  24  *
  25  * DESCRIPTION: Pop (and free) everything on the scope stack except the
  26  *              root scope object (which remains at the stack top.)
  27  *
  28  ***************************************************************************/
  29 void acpi_ds_scope_stack_clear(struct acpi_walk_state *walk_state)
  30 {
  31         union acpi_generic_state *scope_info;
  32
  33         ACPI_FUNCTION_NAME(ds_scope_stack_clear);
  34
  35         while (walk_state->scope_info) {
  36
  37                 /* Pop a scope off the stack */
  38
  39                 scope_info = walk_state->scope_info;
  40                 walk_state->scope_info = scope_info->scope.next;
  41
  42                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
  43                                   "Popped object type (%s)\n",
  44                                   acpi_ut_get_type_name(scope_info->common.
  45                                                         value)));
  46
  47                 acpi_ut_delete_generic_state(scope_info);
  48         }
  49 }
  50
  51 /****************************************************************************
  52  *
  53  * FUNCTION:    acpi_ds_scope_stack_push
  54  *
  55  * PARAMETERS:  node            - Name to be made current
  56  *              type            - Type of frame being pushed
  57  *              walk_state      - Current state
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Push the current scope on the scope stack, and make the
  62  *              passed Node current.
  63  *
  64  ***************************************************************************/
  65
  66 acpi_status
  67 acpi_ds_scope_stack_push(struct acpi_namespace_node *node,
  68                          acpi_object_type type,
  69                          struct acpi_walk_state *walk_state)
  70 {
  71         union acpi_generic_state *scope_info;
  72         union acpi_generic_state *old_scope_info;
  73
  74         ACPI_FUNCTION_TRACE(ds_scope_stack_push);
  75
  76         if (!node) {
  77
  78                 /* Invalid scope   */
  79
  80                 ACPI_ERROR((AE_INFO, "Null scope parameter"));
  81                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  82         }
  83
  84         /* Make sure object type is valid */
  85
  86         if (!acpi_ut_valid_object_type(type)) {
  87                 ACPI_WARNING((AE_INFO, "Invalid object type: 0x%X", type));
  88         }
  89
  90         /* Allocate a new scope object */
  91
  92         scope_info = acpi_ut_create_generic_state();
  93         if (!scope_info) {
  94                 return_ACPI_STATUS(AE_NO_MEMORY);
  95         }
  96
  97         /* Init new scope object */
  98
  99         scope_info->common.descriptor_type = ACPI_DESC_TYPE_STATE_WSCOPE;
 100         scope_info->scope.node = node;
 101         scope_info->common.value = (u16) type;
 102
 103         walk_state->scope_depth++;
 104
 105         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 106                           "[%.2d] Pushed scope ",
 107                           (u32) walk_state->scope_depth));
 108
 109         old_scope_info = walk_state->scope_info;
 110         if (old_scope_info) {
 111                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 112                                       "[%4.4s] (%s)",
 113                                       acpi_ut_get_node_name(old_scope_info->
 114                                                             scope.node),
 115                                       acpi_ut_get_type_name(old_scope_info->
 116                                                             common.value)));
 117         } else {
 118                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, ACPI_NAMESPACE_ROOT));
 119         }
 120
 121         ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
 122                               ", New scope -> [%4.4s] (%s)\n",
 123                               acpi_ut_get_node_name(scope_info->scope.node),
 124                               acpi_ut_get_type_name(scope_info->common.value)));
 125
 126         /* Push new scope object onto stack */
 127
 128         acpi_ut_push_generic_state(&walk_state->scope_info, scope_info);
 129         return_ACPI_STATUS(AE_OK);
 130 }
 131
 132 /****************************************************************************
 133  *
 134  * FUNCTION:    acpi_ds_scope_stack_pop
 135  *
 136  * PARAMETERS:  walk_state      - Current state
 137  *
 138  * RETURN:      Status
 139  *
 140  * DESCRIPTION: Pop the scope stack once.
 141  *
 142  ***************************************************************************/
 143
 144 acpi_status acpi_ds_scope_stack_pop(struct acpi_walk_state *walk_state)
 145 {
 146         union acpi_generic_state *scope_info;
 147         union acpi_generic_state *new_scope_info;
 148
 149         ACPI_FUNCTION_TRACE(ds_scope_stack_pop);
 150
 151         /*
 152          * Pop scope info object off the stack.
 153          */
 154         scope_info = acpi_ut_pop_generic_state(&walk_state->scope_info);
 155         if (!scope_info) {
 156                 return_ACPI_STATUS(AE_STACK_UNDERFLOW);
 157         }
 158
 159         walk_state->scope_depth--;
 160
 161         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 162                           "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
 163                           (u32) walk_state->scope_depth,
 164                           acpi_ut_get_node_name(scope_info->scope.node),
 165                           acpi_ut_get_type_name(scope_info->common.value)));
 166
 167         new_scope_info = walk_state->scope_info;
 168         if (new_scope_info) {
 169                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "[%4.4s] (%s)\n",
 170                                       acpi_ut_get_node_name(new_scope_info->
 171                                                             scope.node),
 172                                       acpi_ut_get_type_name(new_scope_info->
 173                                                             common.value)));
 174         } else {
 175                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, "%s\n",
 176                                       ACPI_NAMESPACE_ROOT));
 177         }
 178
 179         acpi_ut_delete_generic_state(scope_info);
 180         return_ACPI_STATUS(AE_OK);
 181 }