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[~andy/linux] / 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_predefined_data *data,
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_predefined_names
84  *
85  * PARAMETERS:  node            - Namespace node for the method/object
86  *              user_param_count - Number of parameters actually passed
87  *              return_status   - Status from the object evaluation
88  *              return_object_ptr - Pointer to the object returned from the
89  *                                evaluation of a method or object
90  *
91  * RETURN:      Status
92  *
93  * DESCRIPTION: Check an ACPI name for a match in the predefined name list.
94  *
95  ******************************************************************************/
96
97 acpi_status
98 acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
99                                u32 user_param_count,
100                                acpi_status return_status,
101                                union acpi_operand_object **return_object_ptr)
102 {
103         acpi_status status = AE_OK;
104         const union acpi_predefined_info *predefined;
105         char *pathname;
106         struct acpi_predefined_data *data;
107
108         /* Match the name for this method/object against the predefined list */
109
110         predefined = acpi_ut_match_predefined_method(node->name.ascii);
111
112         /* Get the full pathname to the object, for use in warning messages */
113
114         pathname = acpi_ns_get_external_pathname(node);
115         if (!pathname) {
116                 return (AE_OK); /* Could not get pathname, ignore */
117         }
118
119         /*
120          * Check that the parameter count for this method matches the ASL
121          * definition. For predefined names, ensure that both the caller and
122          * the method itself are in accordance with the ACPI specification.
123          */
124         acpi_ns_check_parameter_count(pathname, node, user_param_count,
125                                       predefined);
126
127         /* If not a predefined name, we cannot validate the return object */
128
129         if (!predefined) {
130                 goto cleanup;
131         }
132
133         /*
134          * If the method failed or did not actually return an object, we cannot
135          * validate the return object
136          */
137         if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
138                 goto cleanup;
139         }
140
141         /*
142          * Return value validation and possible repair.
143          *
144          * 1) Don't perform return value validation/repair if this feature
145          * has been disabled via a global option.
146          *
147          * 2) We have a return value, but if one wasn't expected, just exit,
148          * this is not a problem. For example, if the "Implicit Return"
149          * feature is enabled, methods will always return a value.
150          *
151          * 3) If the return value can be of any type, then we cannot perform
152          * any validation, just exit.
153          */
154         if (acpi_gbl_disable_auto_repair ||
155             (!predefined->info.expected_btypes) ||
156             (predefined->info.expected_btypes == ACPI_RTYPE_ALL)) {
157                 goto cleanup;
158         }
159
160         /* Create the parameter data block for object validation */
161
162         data = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_predefined_data));
163         if (!data) {
164                 goto cleanup;
165         }
166         data->predefined = predefined;
167         data->node = node;
168         data->node_flags = node->flags;
169         data->pathname = pathname;
170
171         /*
172          * Check that the type of the main return object is what is expected
173          * for this predefined name
174          */
175         status = acpi_ns_check_object_type(data, return_object_ptr,
176                                            predefined->info.expected_btypes,
177                                            ACPI_NOT_PACKAGE_ELEMENT);
178         if (ACPI_FAILURE(status)) {
179                 goto exit;
180         }
181
182         /*
183          * For returned Package objects, check the type of all sub-objects.
184          * Note: Package may have been newly created by call above.
185          */
186         if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) {
187                 data->parent_package = *return_object_ptr;
188                 status = acpi_ns_check_package(data, return_object_ptr);
189                 if (ACPI_FAILURE(status)) {
190                         goto exit;
191                 }
192         }
193
194         /*
195          * The return object was OK, or it was successfully repaired above.
196          * Now make some additional checks such as verifying that package
197          * objects are sorted correctly (if required) or buffer objects have
198          * the correct data width (bytes vs. dwords). These repairs are
199          * performed on a per-name basis, i.e., the code is specific to
200          * particular predefined names.
201          */
202         status = acpi_ns_complex_repairs(data, node, status, return_object_ptr);
203
204 exit:
205         /*
206          * If the object validation failed or if we successfully repaired one
207          * or more objects, mark the parent node to suppress further warning
208          * messages during the next evaluation of the same method/object.
209          */
210         if (ACPI_FAILURE(status) || (data->flags & ACPI_OBJECT_REPAIRED)) {
211                 node->flags |= ANOBJ_EVALUATED;
212         }
213         ACPI_FREE(data);
214
215 cleanup:
216         ACPI_FREE(pathname);
217         return (status);
218 }
219
220 /*******************************************************************************
221  *
222  * FUNCTION:    acpi_ns_check_parameter_count
223  *
224  * PARAMETERS:  pathname        - Full pathname to the node (for error msgs)
225  *              node            - Namespace node for the method/object
226  *              user_param_count - Number of args passed in by the caller
227  *              predefined      - Pointer to entry in predefined name table
228  *
229  * RETURN:      None
230  *
231  * DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a
232  *              predefined name is what is expected (i.e., what is defined in
233  *              the ACPI specification for this predefined name.)
234  *
235  ******************************************************************************/
236
237 void
238 acpi_ns_check_parameter_count(char *pathname,
239                               struct acpi_namespace_node *node,
240                               u32 user_param_count,
241                               const union acpi_predefined_info *predefined)
242 {
243         u32 param_count;
244         u32 required_params_current;
245         u32 required_params_old;
246
247         /* Methods have 0-7 parameters. All other types have zero. */
248
249         param_count = 0;
250         if (node->type == ACPI_TYPE_METHOD) {
251                 param_count = node->object->method.param_count;
252         }
253
254         if (!predefined) {
255                 /*
256                  * Check the parameter count for non-predefined methods/objects.
257                  *
258                  * Warning if too few or too many arguments have been passed by the
259                  * caller. An incorrect number of arguments may not cause the method
260                  * to fail. However, the method will fail if there are too few
261                  * arguments and the method attempts to use one of the missing ones.
262                  */
263                 if (user_param_count < param_count) {
264                         ACPI_WARN_PREDEFINED((AE_INFO, pathname,
265                                               ACPI_WARN_ALWAYS,
266                                               "Insufficient arguments - needs %u, found %u",
267                                               param_count, user_param_count));
268                 } else if (user_param_count > param_count) {
269                         ACPI_WARN_PREDEFINED((AE_INFO, pathname,
270                                               ACPI_WARN_ALWAYS,
271                                               "Excess arguments - needs %u, found %u",
272                                               param_count, user_param_count));
273                 }
274                 return;
275         }
276
277         /*
278          * Validate the user-supplied parameter count.
279          * Allow two different legal argument counts (_SCP, etc.)
280          */
281         required_params_current =
282             predefined->info.argument_list & METHOD_ARG_MASK;
283         required_params_old =
284             predefined->info.argument_list >> METHOD_ARG_BIT_WIDTH;
285
286         if (user_param_count != ACPI_UINT32_MAX) {
287                 if ((user_param_count != required_params_current) &&
288                     (user_param_count != required_params_old)) {
289                         ACPI_WARN_PREDEFINED((AE_INFO, pathname,
290                                               ACPI_WARN_ALWAYS,
291                                               "Parameter count mismatch - "
292                                               "caller passed %u, ACPI requires %u",
293                                               user_param_count,
294                                               required_params_current));
295                 }
296         }
297
298         /*
299          * Check that the ASL-defined parameter count is what is expected for
300          * this predefined name (parameter count as defined by the ACPI
301          * specification)
302          */
303         if ((param_count != required_params_current) &&
304             (param_count != required_params_old)) {
305                 ACPI_WARN_PREDEFINED((AE_INFO, pathname, node->flags,
306                                       "Parameter count mismatch - ASL declared %u, ACPI requires %u",
307                                       param_count, required_params_current));
308         }
309 }
310
311 /*******************************************************************************
312  *
313  * FUNCTION:    acpi_ns_check_object_type
314  *
315  * PARAMETERS:  data            - Pointer to validation data structure
316  *              return_object_ptr - Pointer to the object returned from the
317  *                                evaluation of a method or object
318  *              expected_btypes - Bitmap of expected return type(s)
319  *              package_index   - Index of object within parent package (if
320  *                                applicable - ACPI_NOT_PACKAGE_ELEMENT
321  *                                otherwise)
322  *
323  * RETURN:      Status
324  *
325  * DESCRIPTION: Check the type of the return object against the expected object
326  *              type(s). Use of Btype allows multiple expected object types.
327  *
328  ******************************************************************************/
329
330 acpi_status
331 acpi_ns_check_object_type(struct acpi_predefined_data *data,
332                           union acpi_operand_object **return_object_ptr,
333                           u32 expected_btypes, u32 package_index)
334 {
335         union acpi_operand_object *return_object = *return_object_ptr;
336         acpi_status status = AE_OK;
337         char type_buffer[48];   /* Room for 5 types */
338
339         /* A Namespace node should not get here, but make sure */
340
341         if (return_object &&
342             ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
343                 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
344                                       "Invalid return type - Found a Namespace node [%4.4s] type %s",
345                                       return_object->node.name.ascii,
346                                       acpi_ut_get_type_name(return_object->node.
347                                                             type)));
348                 return (AE_AML_OPERAND_TYPE);
349         }
350
351         /*
352          * Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
353          * The bitmapped type allows multiple possible return types.
354          *
355          * Note, the cases below must handle all of the possible types returned
356          * from all of the predefined names (including elements of returned
357          * packages)
358          */
359         data->return_btype = acpi_ns_get_bitmapped_type(return_object);
360         if (data->return_btype == ACPI_RTYPE_ANY) {
361
362                 /* Not one of the supported objects, must be incorrect */
363                 goto type_error_exit;
364         }
365
366         /* For reference objects, check that the reference type is correct */
367
368         if ((data->return_btype & expected_btypes) == ACPI_RTYPE_REFERENCE) {
369                 status = acpi_ns_check_reference(data, return_object);
370                 return (status);
371         }
372
373         /* Attempt simple repair of the returned object if necessary */
374
375         status = acpi_ns_simple_repair(data, expected_btypes,
376                                        package_index, return_object_ptr);
377         return (status);
378
379       type_error_exit:
380
381         /* Create a string with all expected types for this predefined object */
382
383         acpi_ut_get_expected_return_types(type_buffer, expected_btypes);
384
385         if (package_index == ACPI_NOT_PACKAGE_ELEMENT) {
386                 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
387                                       "Return type mismatch - found %s, expected %s",
388                                       acpi_ut_get_object_type_name
389                                       (return_object), type_buffer));
390         } else {
391                 ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
392                                       "Return Package type mismatch at index %u - "
393                                       "found %s, expected %s", package_index,
394                                       acpi_ut_get_object_type_name
395                                       (return_object), type_buffer));
396         }
397
398         return (AE_AML_OPERAND_TYPE);
399 }
400
401 /*******************************************************************************
402  *
403  * FUNCTION:    acpi_ns_check_reference
404  *
405  * PARAMETERS:  data            - Pointer to validation data structure
406  *              return_object   - Object returned from the evaluation of a
407  *                                method or object
408  *
409  * RETURN:      Status
410  *
411  * DESCRIPTION: Check a returned reference object for the correct reference
412  *              type. The only reference type that can be returned from a
413  *              predefined method is a named reference. All others are invalid.
414  *
415  ******************************************************************************/
416
417 static acpi_status
418 acpi_ns_check_reference(struct acpi_predefined_data *data,
419                         union acpi_operand_object *return_object)
420 {
421
422         /*
423          * Check the reference object for the correct reference type (opcode).
424          * The only type of reference that can be converted to an union acpi_object is
425          * a reference to a named object (reference class: NAME)
426          */
427         if (return_object->reference.class == ACPI_REFCLASS_NAME) {
428                 return (AE_OK);
429         }
430
431         ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
432                               "Return type mismatch - unexpected reference object type [%s] %2.2X",
433                               acpi_ut_get_reference_name(return_object),
434                               return_object->reference.class));
435
436         return (AE_AML_OPERAND_TYPE);
437 }
438
439 /*******************************************************************************
440  *
441  * FUNCTION:    acpi_ns_get_bitmapped_type
442  *
443  * PARAMETERS:  return_object   - Object returned from method/obj evaluation
444  *
445  * RETURN:      Object return type. ACPI_RTYPE_ANY indicates that the object
446  *              type is not supported. ACPI_RTYPE_NONE indicates that no
447  *              object was returned (return_object is NULL).
448  *
449  * DESCRIPTION: Convert object type into a bitmapped object return type.
450  *
451  ******************************************************************************/
452
453 static u32 acpi_ns_get_bitmapped_type(union acpi_operand_object *return_object)
454 {
455         u32 return_btype;
456
457         if (!return_object) {
458                 return (ACPI_RTYPE_NONE);
459         }
460
461         /* Map acpi_object_type to internal bitmapped type */
462
463         switch (return_object->common.type) {
464         case ACPI_TYPE_INTEGER:
465                 return_btype = ACPI_RTYPE_INTEGER;
466                 break;
467
468         case ACPI_TYPE_BUFFER:
469                 return_btype = ACPI_RTYPE_BUFFER;
470                 break;
471
472         case ACPI_TYPE_STRING:
473                 return_btype = ACPI_RTYPE_STRING;
474                 break;
475
476         case ACPI_TYPE_PACKAGE:
477                 return_btype = ACPI_RTYPE_PACKAGE;
478                 break;
479
480         case ACPI_TYPE_LOCAL_REFERENCE:
481                 return_btype = ACPI_RTYPE_REFERENCE;
482                 break;
483
484         default:
485                 /* Not one of the supported objects, must be incorrect */
486
487                 return_btype = ACPI_RTYPE_ANY;
488                 break;
489         }
490
491         return (return_btype);
492 }