drivers/acpi/acpica/dsinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsinit - Object initialization namespace walk
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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
  50 #define _COMPONENT          ACPI_DISPATCHER
  51 ACPI_MODULE_NAME("dsinit")
  52
  53 /* Local prototypes */
  54 static acpi_status
  55 acpi_ds_init_one_object(acpi_handle obj_handle,
  56                         u32 level, void *context, void **return_value);
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_ds_init_one_object
  61  *
  62  * PARAMETERS:  obj_handle      - Node for the object
  63  *              level           - Current nesting level
  64  *              context         - Points to a init info struct
  65  *              return_value    - Not used
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
  70  *              within the namespace.
  71  *
  72  *              Currently, the only objects that require initialization are:
  73  *              1) Methods
  74  *              2) Operation Regions
  75  *
  76  ******************************************************************************/
  77
  78 static acpi_status
  79 acpi_ds_init_one_object(acpi_handle obj_handle,
  80                         u32 level, void *context, void **return_value)
  81 {
  82         struct acpi_init_walk_info *info =
  83             (struct acpi_init_walk_info *)context;
  84         struct acpi_namespace_node *node =
  85             (struct acpi_namespace_node *)obj_handle;
  86         acpi_status status;
  87         union acpi_operand_object *obj_desc;
  88
  89         ACPI_FUNCTION_ENTRY();
  90
  91         /*
  92          * We are only interested in NS nodes owned by the table that
  93          * was just loaded
  94          */
  95         if (node->owner_id != info->owner_id) {
  96                 return (AE_OK);
  97         }
  98
  99         info->object_count++;
 100
 101         /* And even then, we are only interested in a few object types */
 102
 103         switch (acpi_ns_get_type(obj_handle)) {
 104         case ACPI_TYPE_REGION:
 105
 106                 status = acpi_ds_initialize_region(obj_handle);
 107                 if (ACPI_FAILURE(status)) {
 108                         ACPI_EXCEPTION((AE_INFO, status,
 109                                         "During Region initialization %p [%4.4s]",
 110                                         obj_handle,
 111                                         acpi_ut_get_node_name(obj_handle)));
 112                 }
 113
 114                 info->op_region_count++;
 115                 break;
 116
 117         case ACPI_TYPE_METHOD:
 118                 /*
 119                  * Auto-serialization support. We will examine each method that is
 120                  * not_serialized to determine if it creates any Named objects. If
 121                  * it does, it will be marked serialized to prevent problems if
 122                  * the method is entered by two or more threads and an attempt is
 123                  * made to create the same named object twice -- which results in
 124                  * an AE_ALREADY_EXISTS exception and method abort.
 125                  */
 126                 info->method_count++;
 127                 obj_desc = acpi_ns_get_attached_object(node);
 128                 if (!obj_desc) {
 129                         break;
 130                 }
 131
 132                 /* Ignore if already serialized */
 133
 134                 if (obj_desc->method.info_flags & ACPI_METHOD_SERIALIZED) {
 135                         info->serial_method_count++;
 136                         break;
 137                 }
 138
 139                 if (acpi_gbl_auto_serialize_methods) {
 140
 141                         /* Parse/scan method and serialize it if necessary */
 142
 143                         acpi_ds_auto_serialize_method(node, obj_desc);
 144                         if (obj_desc->method.
 145                             info_flags & ACPI_METHOD_SERIALIZED) {
 146
 147                                 /* Method was just converted to Serialized */
 148
 149                                 info->serial_method_count++;
 150                                 info->serialized_method_count++;
 151                                 break;
 152                         }
 153                 }
 154
 155                 info->non_serial_method_count++;
 156                 break;
 157
 158         case ACPI_TYPE_DEVICE:
 159
 160                 info->device_count++;
 161                 break;
 162
 163         default:
 164
 165                 break;
 166         }
 167
 168         /*
 169          * We ignore errors from above, and always return OK, since
 170          * we don't want to abort the walk on a single error.
 171          */
 172         return (AE_OK);
 173 }
 174
 175 /*******************************************************************************
 176  *
 177  * FUNCTION:    acpi_ds_initialize_objects
 178  *
 179  * PARAMETERS:  table_desc      - Descriptor for parent ACPI table
 180  *              start_node      - Root of subtree to be initialized.
 181  *
 182  * RETURN:      Status
 183  *
 184  * DESCRIPTION: Walk the namespace starting at "StartNode" and perform any
 185  *              necessary initialization on the objects found therein
 186  *
 187  ******************************************************************************/
 188
 189 acpi_status
 190 acpi_ds_initialize_objects(u32 table_index,
 191                            struct acpi_namespace_node * start_node)
 192 {
 193         acpi_status status;
 194         struct acpi_init_walk_info info;
 195         struct acpi_table_header *table;
 196         acpi_owner_id owner_id;
 197
 198         ACPI_FUNCTION_TRACE(ds_initialize_objects);
 199
 200         status = acpi_tb_get_owner_id(table_index, &owner_id);
 201         if (ACPI_FAILURE(status)) {
 202                 return_ACPI_STATUS(status);
 203         }
 204
 205         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 206                           "**** Starting initialization of namespace objects ****\n"));
 207
 208         /* Set all init info to zero */
 209
 210         memset(&info, 0, sizeof(struct acpi_init_walk_info));
 211
 212         info.owner_id = owner_id;
 213         info.table_index = table_index;
 214
 215         /* Walk entire namespace from the supplied root */
 216
 217         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 218         if (ACPI_FAILURE(status)) {
 219                 return_ACPI_STATUS(status);
 220         }
 221
 222         /*
 223          * We don't use acpi_walk_namespace since we do not want to acquire
 224          * the namespace reader lock.
 225          */
 226         status =
 227             acpi_ns_walk_namespace(ACPI_TYPE_ANY, start_node, ACPI_UINT32_MAX,
 228                                    ACPI_NS_WALK_UNLOCK, acpi_ds_init_one_object,
 229                                    NULL, &info, NULL);
 230         if (ACPI_FAILURE(status)) {
 231                 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
 232         }
 233         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 234
 235         status = acpi_get_table_by_index(table_index, &table);
 236         if (ACPI_FAILURE(status)) {
 237                 return_ACPI_STATUS(status);
 238         }
 239
 240         /* DSDT is always the first AML table */
 241
 242         if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT)) {
 243                 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 244                                       "\nInitializing Namespace objects:\n"));
 245         }
 246
 247         /* Summary of objects initialized */
 248
 249         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 250                               "Table [%4.4s:%8.8s] (id %.2X) - %4u Objects with %3u Devices, "
 251                               "%3u Regions, %4u Methods (%u/%u/%u Serial/Non/Cvt)\n",
 252                               table->signature, table->oem_table_id, owner_id,
 253                               info.object_count, info.device_count,
 254                               info.op_region_count, info.method_count,
 255                               info.serial_method_count,
 256                               info.non_serial_method_count,
 257                               info.serialized_method_count));
 258
 259         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "%u Methods, %u Regions\n",
 260                           info.method_count, info.op_region_count));
 261
 262         return_ACPI_STATUS(AE_OK);
 263 }