drivers/acpi/acpica/dsinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsinit - Object initialization namespace walk
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, 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                                    ACPI_NS_WALK_NO_UNLOCK,
 225                                    acpi_ds_init_one_object, NULL, &info, 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 }