1 /******************************************************************************
3 * Module Name: nspredef - Validation of ACPI predefined methods and objects
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2013, Intel Corp.
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44 #define ACPI_CREATE_PREDEFINED_TABLE
46 #include <acpi/acpi.h>
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME("nspredef")
54 /*******************************************************************************
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.
61 * There are several areas that are validated:
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
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.
71 * For any problems found, a warning message is issued.
73 ******************************************************************************/
74 /* Local prototypes */
76 acpi_ns_check_reference(struct acpi_predefined_data
*data
,
77 union acpi_operand_object
*return_object
);
79 static void acpi_ns_get_expected_types(char *buffer
, u32 expected_btypes
);
82 * Names for the types that can be returned by the predefined objects.
83 * Used for warning messages. Must be in the same order as the ACPI_RTYPEs
85 static const char *acpi_rtype_names
[] = {
93 /*******************************************************************************
95 * FUNCTION: acpi_ns_check_predefined_names
97 * PARAMETERS: node - Namespace node for the method/object
98 * user_param_count - Number of parameters actually passed
99 * return_status - Status from the object evaluation
100 * return_object_ptr - Pointer to the object returned from the
101 * evaluation of a method or object
105 * DESCRIPTION: Check an ACPI name for a match in the predefined name list.
107 ******************************************************************************/
110 acpi_ns_check_predefined_names(struct acpi_namespace_node
*node
,
111 u32 user_param_count
,
112 acpi_status return_status
,
113 union acpi_operand_object
**return_object_ptr
)
115 union acpi_operand_object
*return_object
= *return_object_ptr
;
116 acpi_status status
= AE_OK
;
117 const union acpi_predefined_info
*predefined
;
119 struct acpi_predefined_data
*data
;
121 /* Match the name for this method/object against the predefined list */
123 predefined
= acpi_ns_check_for_predefined_name(node
);
125 /* Get the full pathname to the object, for use in warning messages */
127 pathname
= acpi_ns_get_external_pathname(node
);
129 return (AE_OK
); /* Could not get pathname, ignore */
133 * Check that the parameter count for this method matches the ASL
134 * definition. For predefined names, ensure that both the caller and
135 * the method itself are in accordance with the ACPI specification.
137 acpi_ns_check_parameter_count(pathname
, node
, user_param_count
,
140 /* If not a predefined name, we cannot validate the return object */
147 * If the method failed or did not actually return an object, we cannot
148 * validate the return object
150 if ((return_status
!= AE_OK
) && (return_status
!= AE_CTRL_RETURN_VALUE
)) {
155 * If there is no return value, check if we require a return value for
156 * this predefined name. Either one return value is expected, or none,
157 * for both methods and other objects.
159 * Exit now if there is no return object. Warning if one was expected.
161 if (!return_object
) {
162 if ((predefined
->info
.expected_btypes
) &&
163 (!(predefined
->info
.expected_btypes
& ACPI_RTYPE_NONE
))) {
164 ACPI_WARN_PREDEFINED((AE_INFO
, pathname
,
166 "Missing expected return value"));
168 status
= AE_AML_NO_RETURN_VALUE
;
174 * Return value validation and possible repair.
176 * 1) Don't perform return value validation/repair if this feature
177 * has been disabled via a global option.
179 * 2) We have a return value, but if one wasn't expected, just exit,
180 * this is not a problem. For example, if the "Implicit Return"
181 * feature is enabled, methods will always return a value.
183 * 3) If the return value can be of any type, then we cannot perform
184 * any validation, just exit.
186 if (acpi_gbl_disable_auto_repair
||
187 (!predefined
->info
.expected_btypes
) ||
188 (predefined
->info
.expected_btypes
== ACPI_RTYPE_ALL
)) {
192 /* Create the parameter data block for object validation */
194 data
= ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_predefined_data
));
198 data
->predefined
= predefined
;
200 data
->node_flags
= node
->flags
;
201 data
->pathname
= pathname
;
204 * Check that the type of the main return object is what is expected
205 * for this predefined name
207 status
= acpi_ns_check_object_type(data
, return_object_ptr
,
208 predefined
->info
.expected_btypes
,
209 ACPI_NOT_PACKAGE_ELEMENT
);
210 if (ACPI_FAILURE(status
)) {
215 * For returned Package objects, check the type of all sub-objects.
216 * Note: Package may have been newly created by call above.
218 if ((*return_object_ptr
)->common
.type
== ACPI_TYPE_PACKAGE
) {
219 data
->parent_package
= *return_object_ptr
;
220 status
= acpi_ns_check_package(data
, return_object_ptr
);
221 if (ACPI_FAILURE(status
)) {
227 * The return object was OK, or it was successfully repaired above.
228 * Now make some additional checks such as verifying that package
229 * objects are sorted correctly (if required) or buffer objects have
230 * the correct data width (bytes vs. dwords). These repairs are
231 * performed on a per-name basis, i.e., the code is specific to
232 * particular predefined names.
234 status
= acpi_ns_complex_repairs(data
, node
, status
, return_object_ptr
);
238 * If the object validation failed or if we successfully repaired one
239 * or more objects, mark the parent node to suppress further warning
240 * messages during the next evaluation of the same method/object.
242 if (ACPI_FAILURE(status
) || (data
->flags
& ACPI_OBJECT_REPAIRED
)) {
243 node
->flags
|= ANOBJ_EVALUATED
;
252 /*******************************************************************************
254 * FUNCTION: acpi_ns_check_parameter_count
256 * PARAMETERS: pathname - Full pathname to the node (for error msgs)
257 * node - Namespace node for the method/object
258 * user_param_count - Number of args passed in by the caller
259 * predefined - Pointer to entry in predefined name table
263 * DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a
264 * predefined name is what is expected (i.e., what is defined in
265 * the ACPI specification for this predefined name.)
267 ******************************************************************************/
270 acpi_ns_check_parameter_count(char *pathname
,
271 struct acpi_namespace_node
*node
,
272 u32 user_param_count
,
273 const union acpi_predefined_info
*predefined
)
276 u32 required_params_current
;
277 u32 required_params_old
;
279 /* Methods have 0-7 parameters. All other types have zero. */
282 if (node
->type
== ACPI_TYPE_METHOD
) {
283 param_count
= node
->object
->method
.param_count
;
288 * Check the parameter count for non-predefined methods/objects.
290 * Warning if too few or too many arguments have been passed by the
291 * caller. An incorrect number of arguments may not cause the method
292 * to fail. However, the method will fail if there are too few
293 * arguments and the method attempts to use one of the missing ones.
295 if (user_param_count
< param_count
) {
296 ACPI_WARN_PREDEFINED((AE_INFO
, pathname
,
298 "Insufficient arguments - needs %u, found %u",
299 param_count
, user_param_count
));
300 } else if (user_param_count
> param_count
) {
301 ACPI_WARN_PREDEFINED((AE_INFO
, pathname
,
303 "Excess arguments - needs %u, found %u",
304 param_count
, user_param_count
));
310 * Validate the user-supplied parameter count.
311 * Allow two different legal argument counts (_SCP, etc.)
313 required_params_current
= predefined
->info
.param_count
& 0x0F;
314 required_params_old
= predefined
->info
.param_count
>> 4;
316 if (user_param_count
!= ACPI_UINT32_MAX
) {
317 if ((user_param_count
!= required_params_current
) &&
318 (user_param_count
!= required_params_old
)) {
319 ACPI_WARN_PREDEFINED((AE_INFO
, pathname
,
321 "Parameter count mismatch - "
322 "caller passed %u, ACPI requires %u",
324 required_params_current
));
329 * Check that the ASL-defined parameter count is what is expected for
330 * this predefined name (parameter count as defined by the ACPI
333 if ((param_count
!= required_params_current
) &&
334 (param_count
!= required_params_old
)) {
335 ACPI_WARN_PREDEFINED((AE_INFO
, pathname
, node
->flags
,
336 "Parameter count mismatch - ASL declared %u, ACPI requires %u",
337 param_count
, required_params_current
));
341 /*******************************************************************************
343 * FUNCTION: acpi_ns_check_for_predefined_name
345 * PARAMETERS: node - Namespace node for the method/object
347 * RETURN: Pointer to entry in predefined table. NULL indicates not found.
349 * DESCRIPTION: Check an object name against the predefined object list.
351 ******************************************************************************/
353 const union acpi_predefined_info
*acpi_ns_check_for_predefined_name(struct
357 const union acpi_predefined_info
*this_name
;
359 /* Quick check for a predefined name, first character must be underscore */
361 if (node
->name
.ascii
[0] != '_') {
365 /* Search info table for a predefined method/object name */
367 this_name
= predefined_names
;
368 while (this_name
->info
.name
[0]) {
369 if (ACPI_COMPARE_NAME(node
->name
.ascii
, this_name
->info
.name
)) {
374 * Skip next entry in the table if this name returns a Package
375 * (next entry contains the package info)
377 if (this_name
->info
.expected_btypes
& ACPI_RTYPE_PACKAGE
) {
384 return (NULL
); /* Not found */
387 /*******************************************************************************
389 * FUNCTION: acpi_ns_check_object_type
391 * PARAMETERS: data - Pointer to validation data structure
392 * return_object_ptr - Pointer to the object returned from the
393 * evaluation of a method or object
394 * expected_btypes - Bitmap of expected return type(s)
395 * package_index - Index of object within parent package (if
396 * applicable - ACPI_NOT_PACKAGE_ELEMENT
401 * DESCRIPTION: Check the type of the return object against the expected object
402 * type(s). Use of Btype allows multiple expected object types.
404 ******************************************************************************/
407 acpi_ns_check_object_type(struct acpi_predefined_data
*data
,
408 union acpi_operand_object
**return_object_ptr
,
409 u32 expected_btypes
, u32 package_index
)
411 union acpi_operand_object
*return_object
= *return_object_ptr
;
412 acpi_status status
= AE_OK
;
414 char type_buffer
[48]; /* Room for 5 types */
417 * If we get a NULL return_object here, it is a NULL package element.
418 * Since all extraneous NULL package elements were removed earlier by a
419 * call to acpi_ns_remove_null_elements, this is an unexpected NULL element.
420 * We will attempt to repair it.
422 if (!return_object
) {
423 status
= acpi_ns_repair_null_element(data
, expected_btypes
,
426 if (ACPI_SUCCESS(status
)) {
427 return (AE_OK
); /* Repair was successful */
429 goto type_error_exit
;
432 /* A Namespace node should not get here, but make sure */
434 if (ACPI_GET_DESCRIPTOR_TYPE(return_object
) == ACPI_DESC_TYPE_NAMED
) {
435 ACPI_WARN_PREDEFINED((AE_INFO
, data
->pathname
, data
->node_flags
,
436 "Invalid return type - Found a Namespace node [%4.4s] type %s",
437 return_object
->node
.name
.ascii
,
438 acpi_ut_get_type_name(return_object
->node
.
440 return (AE_AML_OPERAND_TYPE
);
444 * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
445 * The bitmapped type allows multiple possible return types.
447 * Note, the cases below must handle all of the possible types returned
448 * from all of the predefined names (including elements of returned
451 switch (return_object
->common
.type
) {
452 case ACPI_TYPE_INTEGER
:
453 return_btype
= ACPI_RTYPE_INTEGER
;
456 case ACPI_TYPE_BUFFER
:
457 return_btype
= ACPI_RTYPE_BUFFER
;
460 case ACPI_TYPE_STRING
:
461 return_btype
= ACPI_RTYPE_STRING
;
464 case ACPI_TYPE_PACKAGE
:
465 return_btype
= ACPI_RTYPE_PACKAGE
;
468 case ACPI_TYPE_LOCAL_REFERENCE
:
469 return_btype
= ACPI_RTYPE_REFERENCE
;
473 /* Not one of the supported objects, must be incorrect */
475 goto type_error_exit
;
478 /* Is the object one of the expected types? */
480 if (return_btype
& expected_btypes
) {
482 /* For reference objects, check that the reference type is correct */
484 if (return_object
->common
.type
== ACPI_TYPE_LOCAL_REFERENCE
) {
485 status
= acpi_ns_check_reference(data
, return_object
);
491 /* Type mismatch -- attempt repair of the returned object */
493 status
= acpi_ns_repair_object(data
, expected_btypes
,
494 package_index
, return_object_ptr
);
495 if (ACPI_SUCCESS(status
)) {
496 return (AE_OK
); /* Repair was successful */
501 /* Create a string with all expected types for this predefined object */
503 acpi_ns_get_expected_types(type_buffer
, expected_btypes
);
505 if (package_index
== ACPI_NOT_PACKAGE_ELEMENT
) {
506 ACPI_WARN_PREDEFINED((AE_INFO
, data
->pathname
, data
->node_flags
,
507 "Return type mismatch - found %s, expected %s",
508 acpi_ut_get_object_type_name
509 (return_object
), type_buffer
));
511 ACPI_WARN_PREDEFINED((AE_INFO
, data
->pathname
, data
->node_flags
,
512 "Return Package type mismatch at index %u - "
513 "found %s, expected %s", package_index
,
514 acpi_ut_get_object_type_name
515 (return_object
), type_buffer
));
518 return (AE_AML_OPERAND_TYPE
);
521 /*******************************************************************************
523 * FUNCTION: acpi_ns_check_reference
525 * PARAMETERS: data - Pointer to validation data structure
526 * return_object - Object returned from the evaluation of a
531 * DESCRIPTION: Check a returned reference object for the correct reference
532 * type. The only reference type that can be returned from a
533 * predefined method is a named reference. All others are invalid.
535 ******************************************************************************/
538 acpi_ns_check_reference(struct acpi_predefined_data
*data
,
539 union acpi_operand_object
*return_object
)
543 * Check the reference object for the correct reference type (opcode).
544 * The only type of reference that can be converted to an union acpi_object is
545 * a reference to a named object (reference class: NAME)
547 if (return_object
->reference
.class == ACPI_REFCLASS_NAME
) {
551 ACPI_WARN_PREDEFINED((AE_INFO
, data
->pathname
, data
->node_flags
,
552 "Return type mismatch - unexpected reference object type [%s] %2.2X",
553 acpi_ut_get_reference_name(return_object
),
554 return_object
->reference
.class));
556 return (AE_AML_OPERAND_TYPE
);
559 /*******************************************************************************
561 * FUNCTION: acpi_ns_get_expected_types
563 * PARAMETERS: buffer - Pointer to where the string is returned
564 * expected_btypes - Bitmap of expected return type(s)
566 * RETURN: Buffer is populated with type names.
568 * DESCRIPTION: Translate the expected types bitmap into a string of ascii
569 * names of expected types, for use in warning messages.
571 ******************************************************************************/
573 static void acpi_ns_get_expected_types(char *buffer
, u32 expected_btypes
)
581 this_rtype
= ACPI_RTYPE_INTEGER
;
583 for (i
= 0; i
< ACPI_NUM_RTYPES
; i
++) {
585 /* If one of the expected types, concatenate the name of this type */
587 if (expected_btypes
& this_rtype
) {
588 ACPI_STRCAT(buffer
, &acpi_rtype_names
[i
][j
]);
589 j
= 0; /* Use name separator from now on */
591 this_rtype
<<= 1; /* Next Rtype */