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 - 2020, 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
  18 ACPI_MODULE_NAME("dsinit")
  19
  20 /* Local prototypes */
  21 static acpi_status
  22 acpi_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
  45 static acpi_status
  46 acpi_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
 156 acpi_status
 157 acpi_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 }