drivers/acpi/acpica/nspredef.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nspredef - Validation of ACPI predefined methods and objects
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 #define ACPI_CREATE_PREDEFINED_TABLE
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acnamesp.h"
  49 #include "acpredef.h"
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52 ACPI_MODULE_NAME("nspredef")
  53
  54 /*******************************************************************************
  55  *
  56  * This module validates predefined ACPI objects that appear in the namespace,
  57  * at the time they are evaluated (via acpi_evaluate_object). The purpose of this
  58  * validation is to detect problems with BIOS-exposed predefined ACPI objects
  59  * before the results are returned to the ACPI-related drivers.
  60  *
  61  * There are several areas that are validated:
  62  *
  63  *  1) The number of input arguments as defined by the method/object in the
  64  *     ASL is validated against the ACPI specification.
  65  *  2) The type of the return object (if any) is validated against the ACPI
  66  *     specification.
  67  *  3) For returned package objects, the count of package elements is
  68  *     validated, as well as the type of each package element. Nested
  69  *     packages are supported.
  70  *
  71  * For any problems found, a warning message is issued.
  72  *
  73  ******************************************************************************/
  74 /* Local prototypes */
  75 static acpi_status
  76 acpi_ns_check_reference(struct acpi_evaluate_info *info,
  77                         union acpi_operand_object *return_object);
  78
  79 static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object);
  80
  81 /*******************************************************************************
  82  *
  83  * FUNCTION:    acpi_ns_check_return_value
  84  *
  85  * PARAMETERS:  node            - Namespace node for the method/object
  86  *              info            - Method execution information block
  87  *              user_param_count - Number of parameters actually passed
  88  *              return_status   - Status from the object evaluation
  89  *              return_object_ptr - Pointer to the object returned from the
  90  *                                evaluation of a method or object
  91  *
  92  * RETURN:      Status
  93  *
  94  * DESCRIPTION: Check the value returned from a predefined name.
  95  *
  96  ******************************************************************************/
  97
  98 acpi_status
  99 acpi_ns_check_return_value(struct acpi_namespace_node *node,
 100                            struct acpi_evaluate_info *info,
 101                            u32 user_param_count,
 102                            acpi_status return_status,
 103                            union acpi_operand_object **return_object_ptr)
 104 {
 105         acpi_status status;
 106         const union acpi_predefined_info *predefined;
 107
 108         /* If not a predefined name, we cannot validate the return object */
 109
 110         predefined = info->predefined;
 111         if (!predefined) {
 112                 return (AE_OK);
 113         }
 114
 115         /*
 116          * If the method failed or did not actually return an object, we cannot
 117          * validate the return object
 118          */
 119         if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
 120                 return (AE_OK);
 121         }
 122
 123         /*
 124          * Return value validation and possible repair.
 125          *
 126          * 1) Don't perform return value validation/repair if this feature
 127          * has been disabled via a global option.
 128          *
 129          * 2) We have a return value, but if one wasn't expected, just exit,
 130          * this is not a problem. For example, if the "Implicit Return"
 131          * feature is enabled, methods will always return a value.
 132          *
 133          * 3) If the return value can be of any type, then we cannot perform
 134          * any validation, just exit.
 135          */
 136         if (acpi_gbl_disable_auto_repair ||
 137             (!predefined->info.expected_btypes) ||
 138             (predefined->info.expected_btypes == ACPI_RTYPE_ALL)) {
 139                 return (AE_OK);
 140         }
 141
 142         /*
 143          * Check that the type of the main return object is what is expected
 144          * for this predefined name
 145          */
 146         status = acpi_ns_check_object_type(info, return_object_ptr,
 147                                            predefined->info.expected_btypes,
 148                                            ACPI_NOT_PACKAGE_ELEMENT);
 149         if (ACPI_FAILURE(status)) {
 150                 goto exit;
 151         }
 152
 153         /*
 154          * For returned Package objects, check the type of all sub-objects.
 155          * Note: Package may have been newly created by call above.
 156          */
 157         if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) {
 158                 info->parent_package = *return_object_ptr;
 159                 status = acpi_ns_check_package(info, return_object_ptr);
 160                 if (ACPI_FAILURE(status)) {
 161                         goto exit;
 162                 }
 163         }
 164
 165         /*
 166          * The return object was OK, or it was successfully repaired above.
 167          * Now make some additional checks such as verifying that package
 168          * objects are sorted correctly (if required) or buffer objects have
 169          * the correct data width (bytes vs. dwords). These repairs are
 170          * performed on a per-name basis, i.e., the code is specific to
 171          * particular predefined names.
 172          */
 173         status = acpi_ns_complex_repairs(info, node, status, return_object_ptr);
 174
 175 exit:
 176         /*
 177          * If the object validation failed or if we successfully repaired one
 178          * or more objects, mark the parent node to suppress further warning
 179          * messages during the next evaluation of the same method/object.
 180          */
 181         if (ACPI_FAILURE(status) || (info->return_flags & ACPI_OBJECT_REPAIRED)) {
 182                 node->flags |= ANOBJ_EVALUATED;
 183         }
 184
 185         return (status);
 186 }
 187
 188 /*******************************************************************************
 189  *
 190  * FUNCTION:    acpi_ns_check_object_type
 191  *
 192  * PARAMETERS:  info            - Method execution information block
 193  *              return_object_ptr - Pointer to the object returned from the
 194  *                                evaluation of a method or object
 195  *              expected_btypes - Bitmap of expected return type(s)
 196  *              package_index   - Index of object within parent package (if
 197  *                                applicable - ACPI_NOT_PACKAGE_ELEMENT
 198  *                                otherwise)
 199  *
 200  * RETURN:      Status
 201  *
 202  * DESCRIPTION: Check the type of the return object against the expected object
 203  *              type(s). Use of Btype allows multiple expected object types.
 204  *
 205  ******************************************************************************/
 206
 207 acpi_status
 208 acpi_ns_check_object_type(struct acpi_evaluate_info *info,
 209                           union acpi_operand_object **return_object_ptr,
 210                           u32 expected_btypes, u32 package_index)
 211 {
 212         union acpi_operand_object *return_object = *return_object_ptr;
 213         acpi_status status = AE_OK;
 214         char type_buffer[48];   /* Room for 5 types */
 215
 216         /* A Namespace node should not get here, but make sure */
 217
 218         if (return_object &&
 219             ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
 220                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 221                                       info->node_flags,
 222                                       "Invalid return type - Found a Namespace node [%4.4s] type %s",
 223                                       return_object->node.name.ascii,
 224                                       acpi_ut_get_type_name(return_object->node.
 225                                                             type)));
 226                 return (AE_AML_OPERAND_TYPE);
 227         }
 228
 229         /*
 230          * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
 231          * The bitmapped type allows multiple possible return types.
 232          *
 233          * Note, the cases below must handle all of the possible types returned
 234          * from all of the predefined names (including elements of returned
 235          * packages)
 236          */
 237         info->return_btype = acpi_ns_get_bitmapped_type(return_object);
 238         if (info->return_btype == ACPI_RTYPE_ANY) {
 239
 240                 /* Not one of the supported objects, must be incorrect */
 241                 goto type_error_exit;
 242         }
 243
 244         /* For reference objects, check that the reference type is correct */
 245
 246         if ((info->return_btype & expected_btypes) == ACPI_RTYPE_REFERENCE) {
 247                 status = acpi_ns_check_reference(info, return_object);
 248                 return (status);
 249         }
 250
 251         /* Attempt simple repair of the returned object if necessary */
 252
 253         status = acpi_ns_simple_repair(info, expected_btypes,
 254                                        package_index, return_object_ptr);
 255         if (ACPI_SUCCESS(status)) {
 256                 return (AE_OK); /* Successful repair */
 257         }
 258
 259       type_error_exit:
 260
 261         /* Create a string with all expected types for this predefined object */
 262
 263         acpi_ut_get_expected_return_types(type_buffer, expected_btypes);
 264
 265         if (package_index == ACPI_NOT_PACKAGE_ELEMENT) {
 266                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 267                                       info->node_flags,
 268                                       "Return type mismatch - found %s, expected %s",
 269                                       acpi_ut_get_object_type_name
 270                                       (return_object), type_buffer));
 271         } else {
 272                 ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
 273                                       info->node_flags,
 274                                       "Return Package type mismatch at index %u - "
 275                                       "found %s, expected %s", package_index,
 276                                       acpi_ut_get_object_type_name
 277                                       (return_object), type_buffer));
 278         }
 279
 280         return (AE_AML_OPERAND_TYPE);
 281 }
 282
 283 /*******************************************************************************
 284  *
 285  * FUNCTION:    acpi_ns_check_reference
 286  *
 287  * PARAMETERS:  info            - Method execution information block
 288  *              return_object   - Object returned from the evaluation of a
 289  *                                method or object
 290  *
 291  * RETURN:      Status
 292  *
 293  * DESCRIPTION: Check a returned reference object for the correct reference
 294  *              type. The only reference type that can be returned from a
 295  *              predefined method is a named reference. All others are invalid.
 296  *
 297  ******************************************************************************/
 298
 299 static acpi_status
 300 acpi_ns_check_reference(struct acpi_evaluate_info *info,
 301                         union acpi_operand_object *return_object)
 302 {
 303
 304         /*
 305          * Check the reference object for the correct reference type (opcode).
 306          * The only type of reference that can be converted to an union acpi_object is
 307          * a reference to a named object (reference class: NAME)
 308          */
 309         if (return_object->reference.class == ACPI_REFCLASS_NAME) {
 310                 return (AE_OK);
 311         }
 312
 313         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
 314                               "Return type mismatch - unexpected reference object type [%s] %2.2X",
 315                               acpi_ut_get_reference_name(return_object),
 316                               return_object->reference.class));
 317
 318         return (AE_AML_OPERAND_TYPE);
 319 }
 320
 321 /*******************************************************************************
 322  *
 323  * FUNCTION:    acpi_ns_get_bitmapped_type
 324  *
 325  * PARAMETERS:  return_object   - Object returned from method/obj evaluation
 326  *
 327  * RETURN:      Object return type. ACPI_RTYPE_ANY indicates that the object
 328  *              type is not supported. ACPI_RTYPE_NONE indicates that no
 329  *              object was returned (return_object is NULL).
 330  *
 331  * DESCRIPTION: Convert object type into a bitmapped object return type.
 332  *
 333  ******************************************************************************/
 334
 335 static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object)
 336 {
 337         u32 return_btype;
 338
 339         if (!return_object) {
 340                 return (ACPI_RTYPE_NONE);
 341         }
 342
 343         /* Map acpi_object_type to internal bitmapped type */
 344
 345         switch (return_object->common.type) {
 346         case ACPI_TYPE_INTEGER:
 347
 348                 return_btype = ACPI_RTYPE_INTEGER;
 349                 break;
 350
 351         case ACPI_TYPE_BUFFER:
 352
 353                 return_btype = ACPI_RTYPE_BUFFER;
 354                 break;
 355
 356         case ACPI_TYPE_STRING:
 357
 358                 return_btype = ACPI_RTYPE_STRING;
 359                 break;
 360
 361         case ACPI_TYPE_PACKAGE:
 362
 363                 return_btype = ACPI_RTYPE_PACKAGE;
 364                 break;
 365
 366         case ACPI_TYPE_LOCAL_REFERENCE:
 367
 368                 return_btype = ACPI_RTYPE_REFERENCE;
 369                 break;
 370
 371         default:
 372
 373                 /* Not one of the supported objects, must be incorrect */
 374
 375                 return_btype = ACPI_RTYPE_ANY;
 376                 break;
 377         }
 378
 379         return (return_btype);
 380 }