acpica/namespace/nsrepair2.c

/******************************************************************************
 *
 * Module Name: nsrepair2 - Repair for objects returned by specific
 *                          predefined methods
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
 * All rights reserved.
 *
 * 2. License
 *
 * 2.1. This is your license from Intel Corp. under its intellectual property
 * rights.  You may have additional license terms from the party that provided
 * you this software, covering your right to use that party's intellectual
 * property rights.
 *
 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
 * copy of the source code appearing in this file ("Covered Code") an
 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
 * base code distributed originally by Intel ("Original Intel Code") to copy,
 * make derivatives, distribute, use and display any portion of the Covered
 * Code in any form, with the right to sublicense such rights; and
 *
 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
 * license (with the right to sublicense), under only those claims of Intel
 * patents that are infringed by the Original Intel Code, to make, use, sell,
 * offer to sell, and import the Covered Code and derivative works thereof
 * solely to the minimum extent necessary to exercise the above copyright
 * license, and in no event shall the patent license extend to any additions
 * to or modifications of the Original Intel Code.  No other license or right
 * is granted directly or by implication, estoppel or otherwise;
 *
 * The above copyright and patent license is granted only if the following
 * conditions are met:
 *
 * 3. Conditions
 *
 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification with rights to further distribute source must include
 * the above Copyright Notice, the above License, this list of Conditions,
 * and the following Disclaimer and Export Compliance provision.  In addition,
 * Licensee must cause all Covered Code to which Licensee contributes to
 * contain a file documenting the changes Licensee made to create that Covered
 * Code and the date of any change.  Licensee must include in that file the
 * documentation of any changes made by any predecessor Licensee.  Licensee
 * must include a prominent statement that the modification is derived,
 * directly or indirectly, from Original Intel Code.
 *
 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification without rights to further distribute source must
 * include the following Disclaimer and Export Compliance provision in the
 * documentation and/or other materials provided with distribution.  In
 * addition, Licensee may not authorize further sublicense of source of any
 * portion of the Covered Code, and must include terms to the effect that the
 * license from Licensee to its licensee is limited to the intellectual
 * property embodied in the software Licensee provides to its licensee, and
 * not to intellectual property embodied in modifications its licensee may
 * make.
 *
 * 3.3. Redistribution of Executable. Redistribution in executable form of any
 * substantial portion of the Covered Code or modification must reproduce the
 * above Copyright Notice, and the following Disclaimer and Export Compliance
 * provision in the documentation and/or other materials provided with the
 * distribution.
 *
 * 3.4. Intel retains all right, title, and interest in and to the Original
 * Intel Code.
 *
 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
 * Intel shall be used in advertising or otherwise to promote the sale, use or
 * other dealings in products derived from or relating to the Covered Code
 * without prior written authorization from Intel.
 *
 * 4. Disclaimer and Export Compliance
 *
 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
 * PARTICULAR PURPOSE.
 *
 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
 * LIMITED REMEDY.
 *
 * 4.3. Licensee shall not export, either directly or indirectly, any of this
 * software or system incorporating such software without first obtaining any
 * required license or other approval from the U. S. Department of Commerce or
 * any other agency or department of the United States Government.  In the
 * event Licensee exports any such software from the United States or
 * re-exports any such software from a foreign destination, Licensee shall
 * ensure that the distribution and export/re-export of the software is in
 * compliance with all laws, regulations, orders, or other restrictions of the
 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 * any of its subsidiaries will export/re-export any technical data, process,
 * software, or service, directly or indirectly, to any country for which the
 * United States government or any agency thereof requires an export license,
 * other governmental approval, or letter of assurance, without first obtaining
 * such license, approval or letter.
 *
 *****************************************************************************/

#define __NSREPAIR2_C__

#include "acpi.h"
#include "accommon.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_NAMESPACE
        ACPI_MODULE_NAME    ("nsrepair2")


/*
 * Information structure and handler for ACPI predefined names that can
 * be repaired on a per-name basis.
 */
typedef
ACPI_STATUS (*ACPI_REPAIR_FUNCTION) (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr);

typedef struct acpi_repair_info
{
    char                    Name[ACPI_NAME_SIZE];
    ACPI_REPAIR_FUNCTION    RepairFunction;

} ACPI_REPAIR_INFO;


/* Local prototypes */

static const ACPI_REPAIR_INFO *
AcpiNsMatchRepairableName (
    ACPI_NAMESPACE_NODE     *Node);

static ACPI_STATUS
AcpiNsRepair_ALR (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr);

static ACPI_STATUS
AcpiNsRepair_PSS (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr);

static ACPI_STATUS
AcpiNsRepair_TSS (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr);

static ACPI_STATUS
AcpiNsCheckSortedList (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     *ReturnObject,
    UINT32                  ExpectedCount,
    UINT32                  SortIndex,
    UINT8                   SortDirection,
    char                    *SortKeyName);

static ACPI_STATUS
AcpiNsRemoveNullElements (
    ACPI_OPERAND_OBJECT     *Package);

static ACPI_STATUS
AcpiNsSortList (
    ACPI_OPERAND_OBJECT     **Elements,
    UINT32                  Count,
    UINT32                  Index,
    UINT8                   SortDirection);

/* Values for SortDirection above */

#define ACPI_SORT_ASCENDING     0
#define ACPI_SORT_DESCENDING    1


/*
 * This table contains the names of the predefined methods for which we can
 * perform more complex repairs.
 *
 * _ALR: Sort the list ascending by AmbientIlluminance if necessary
 * _PSS: Sort the list descending by Power if necessary
 * _TSS: Sort the list descending by Power if necessary
 */
static const ACPI_REPAIR_INFO       AcpiNsRepairableNames[] =
{
    {"_ALR", AcpiNsRepair_ALR},
    {"_PSS", AcpiNsRepair_PSS},
    {"_TSS", AcpiNsRepair_TSS},
    {{0,0,0,0}, NULL}             /* Table terminator */
};


/******************************************************************************
 *
 * FUNCTION:    AcpiNsComplexRepairs
 *
 * PARAMETERS:  Data                - Pointer to validation data structure
 *              Node                - Namespace node for the method/object
 *              ValidateStatus      - Original status of earlier validation
 *              ReturnObjectPtr     - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if repair was successful. If name is not
 *              matched, ValidateStatus is returned.
 *
 * DESCRIPTION: Attempt to repair/convert a return object of a type that was
 *              not expected.
 *
 *****************************************************************************/

ACPI_STATUS
AcpiNsComplexRepairs (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_NAMESPACE_NODE     *Node,
    ACPI_STATUS             ValidateStatus,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
{
    const ACPI_REPAIR_INFO  *Predefined;
    ACPI_STATUS             Status;


    /* Check if this name is in the list of repairable names */

    Predefined = AcpiNsMatchRepairableName (Node);
    if (!Predefined)
    {
        return (ValidateStatus);
    }

    Status = Predefined->RepairFunction (Data, ReturnObjectPtr);
    return (Status);
}


/******************************************************************************
 *
 * FUNCTION:    AcpiNsMatchRepairableName
 *
 * PARAMETERS:  Node                - Namespace node for the method/object
 *
 * RETURN:      Pointer to entry in repair table. NULL indicates not found.
 *
 * DESCRIPTION: Check an object name against the repairable object list.
 *
 *****************************************************************************/

static const ACPI_REPAIR_INFO *
AcpiNsMatchRepairableName (
    ACPI_NAMESPACE_NODE     *Node)
{
    const ACPI_REPAIR_INFO  *ThisName;


    /* Search info table for a repairable predefined method/object name */

    ThisName = AcpiNsRepairableNames;
    while (ThisName->RepairFunction)
    {
        if (ACPI_COMPARE_NAME (Node->Name.Ascii, ThisName->Name))
        {
            return (ThisName);
        }
        ThisName++;
    }

    return (NULL); /* Not found */
}


/******************************************************************************
 *
 * FUNCTION:    AcpiNsRepair_ALR
 *
 * PARAMETERS:  Data                - Pointer to validation data structure
 *              ReturnObjectPtr     - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _ALR object. If necessary, sort the object list
 *              ascending by the ambient illuminance values.
 *
 *****************************************************************************/

static ACPI_STATUS
AcpiNsRepair_ALR (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
{
    ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
    ACPI_STATUS             Status;


    Status = AcpiNsCheckSortedList (Data, ReturnObject, 2, 1,
                ACPI_SORT_ASCENDING, "AmbientIlluminance");

    return (Status);
}


/******************************************************************************
 *
 * FUNCTION:    AcpiNsRepair_TSS
 *
 * PARAMETERS:  Data                - Pointer to validation data structure
 *              ReturnObjectPtr     - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _TSS object. If necessary, sort the object list
 *              descending by the power dissipation values.
 *
 *****************************************************************************/

static ACPI_STATUS
AcpiNsRepair_TSS (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
{
    ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
    ACPI_STATUS             Status;


    Status = AcpiNsCheckSortedList (Data, ReturnObject, 5, 1,
                ACPI_SORT_DESCENDING, "PowerDissipation");

    return (Status);
}


/******************************************************************************
 *
 * FUNCTION:    AcpiNsRepair_PSS
 *
 * PARAMETERS:  Data                - Pointer to validation data structure
 *              ReturnObjectPtr     - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status. AE_OK if object is OK or was repaired successfully
 *
 * DESCRIPTION: Repair for the _PSS object. If necessary, sort the object list
 *              by the CPU frequencies. Check that the power dissipation values
 *              are all proportional to CPU frequency (i.e., sorting by
 *              frequency should be the same as sorting by power.)
 *
 *****************************************************************************/

static ACPI_STATUS
AcpiNsRepair_PSS (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
{
    ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
    ACPI_OPERAND_OBJECT     **OuterElements;
    UINT32                  OuterElementCount;
    ACPI_OPERAND_OBJECT     **Elements;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    UINT32                  PreviousValue;
    ACPI_STATUS             Status;
    UINT32                  i;


    /*
     * Entries (sub-packages) in the _PSS Package must be sorted by power
     * dissipation, in descending order. If it appears that the list is
     * incorrectly sorted, sort it. We sort by CpuFrequency, since this
     * should be proportional to the power.
     */
    Status =AcpiNsCheckSortedList (Data, ReturnObject, 6, 0,
                ACPI_SORT_DESCENDING, "CpuFrequency");
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /*
     * We now know the list is correctly sorted by CPU frequency. Check if
     * the power dissipation values are proportional.
     */
    PreviousValue = ACPI_UINT32_MAX;
    OuterElements = ReturnObject->Package.Elements;
    OuterElementCount = ReturnObject->Package.Count;

    for (i = 0; i < OuterElementCount; i++)
    {
        Elements = (*OuterElements)->Package.Elements;
        ObjDesc = Elements[1]; /* Index1 = PowerDissipation */

        if ((UINT32) ObjDesc->Integer.Value > PreviousValue)
        {
            ACPI_WARN_PREDEFINED ((AE_INFO, Data->Pathname, Data->NodeFlags,
                "SubPackage[%u,%u] - suspicious power dissipation values",
                i-1, i));
        }

        PreviousValue = (UINT32) ObjDesc->Integer.Value;
        OuterElements++;
    }

    return (AE_OK);
}


/******************************************************************************
 *
 * FUNCTION:    AcpiNsCheckSortedList
 *
 * PARAMETERS:  Data                - Pointer to validation data structure
 *              ReturnObject        - Pointer to the top-level returned object
 *              ExpectedCount       - Minimum length of each sub-package
 *              SortIndex           - Sub-package entry to sort on
 *              SortDirection       - Ascending or descending
 *              SortKeyName         - Name of the SortIndex field
 *
 * RETURN:      Status. AE_OK if the list is valid and is sorted correctly or
 *              has been repaired by sorting the list.
 *
 * DESCRIPTION: Check if the package list is valid and sorted correctly by the
 *              SortIndex. If not, then sort the list.
 *
 *****************************************************************************/

static ACPI_STATUS
AcpiNsCheckSortedList (
    ACPI_PREDEFINED_DATA    *Data,
    ACPI_OPERAND_OBJECT     *ReturnObject,
    UINT32                  ExpectedCount,
    UINT32                  SortIndex,
    UINT8                   SortDirection,
    char                    *SortKeyName)
{
    UINT32                  OuterElementCount;
    ACPI_OPERAND_OBJECT     **OuterElements;
    ACPI_OPERAND_OBJECT     **Elements;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    UINT32                  i;
    UINT32                  PreviousValue;
    ACPI_STATUS             Status;


    /* The top-level object must be a package */

    if (ReturnObject->Common.Type != ACPI_TYPE_PACKAGE)
    {
        return (AE_AML_OPERAND_TYPE);
    }

    /*
     * Detect any NULL package elements and remove them from the
     * package.
     *
     * TBD: We may want to do this for all predefined names that
     * return a variable-length package of packages.
     */
    Status = AcpiNsRemoveNullElements (ReturnObject);
    if (Status == AE_NULL_ENTRY)
    {
        ACPI_INFO_PREDEFINED ((AE_INFO, Data->Pathname, Data->NodeFlags,
            "NULL elements removed from package"));

        /* Exit if package is now zero length */

        if (!ReturnObject->Package.Count)
        {
            return (AE_NULL_ENTRY);
        }
    }

    OuterElements = ReturnObject->Package.Elements;
    OuterElementCount = ReturnObject->Package.Count;
    if (!OuterElementCount)
    {
        return (AE_AML_PACKAGE_LIMIT);
    }

    PreviousValue = 0;
    if (SortDirection == ACPI_SORT_DESCENDING)
    {
        PreviousValue = ACPI_UINT32_MAX;
    }

    /* Examine each subpackage */

    for (i = 0; i < OuterElementCount; i++)
    {
        /* Each element of the top-level package must also be a package */

        if ((*OuterElements)->Common.Type != ACPI_TYPE_PACKAGE)
        {
            return (AE_AML_OPERAND_TYPE);
        }

        /* Each sub-package must have the minimum length */

        if ((*OuterElements)->Package.Count < ExpectedCount)
        {
            return (AE_AML_PACKAGE_LIMIT);
        }

        Elements = (*OuterElements)->Package.Elements;
        ObjDesc = Elements[SortIndex];

        if (ObjDesc->Common.Type != ACPI_TYPE_INTEGER)
        {
            return (AE_AML_OPERAND_TYPE);
        }

        /*
         * The list must be sorted in the specified order. If we detect a
         * discrepancy, issue a warning and sort the entire list
         */
        if (((SortDirection == ACPI_SORT_ASCENDING) &&
                (ObjDesc->Integer.Value < PreviousValue)) ||
            ((SortDirection == ACPI_SORT_DESCENDING) &&
                (ObjDesc->Integer.Value > PreviousValue)))
        {
            Status = AcpiNsSortList (ReturnObject->Package.Elements,
                        OuterElementCount, SortIndex, SortDirection);
            if (ACPI_FAILURE (Status))
            {
                return (Status);
            }

            Data->Flags |= ACPI_OBJECT_REPAIRED;

            ACPI_INFO_PREDEFINED ((AE_INFO, Data->Pathname, Data->NodeFlags,
                "Repaired unsorted list - now sorted by %s", SortKeyName));
            return (AE_OK);
        }

        PreviousValue = (UINT32) ObjDesc->Integer.Value;
        OuterElements++;
    }

    return (AE_OK);
}


/******************************************************************************
 *
 * FUNCTION:    AcpiNsRemoveNullElements
 *
 * PARAMETERS:  ObjDesc             - A Package object
 *
 * RETURN:      Status. AE_NULL_ENTRY means that one or more elements were
 *              removed.
 *
 * DESCRIPTION: Remove all NULL package elements and update the package count.
 *
 *****************************************************************************/

static ACPI_STATUS
AcpiNsRemoveNullElements (
    ACPI_OPERAND_OBJECT     *ObjDesc)
{
    ACPI_OPERAND_OBJECT     **Source;
    ACPI_OPERAND_OBJECT     **Dest;
    ACPI_STATUS             Status = AE_OK;
    UINT32                  Count;
    UINT32                  NewCount;
    UINT32                  i;


    Count = ObjDesc->Package.Count;
    NewCount = Count;

    Source = ObjDesc->Package.Elements;
    Dest = Source;

    /* Examine all elements of the package object */

    for (i = 0; i < Count; i++)
    {
        if (!*Source)
        {
            Status = AE_NULL_ENTRY;
            NewCount--;
        }
        else
        {
            *Dest = *Source;
            Dest++;
        }
        Source++;
    }

    if (Status == AE_NULL_ENTRY)
    {
        /* NULL terminate list and update the package count */

        *Dest = NULL;
        ObjDesc->Package.Count = NewCount;
    }

    return (Status);
}


/******************************************************************************
 *
 * FUNCTION:    AcpiNsSortList
 *
 * PARAMETERS:  Elements            - Package object element list
 *              Count               - Element count for above
 *              Index               - Sort by which package element
 *              SortDirection       - Ascending or Descending sort
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Sort the objects that are in a package element list.
 *
 * NOTE: Assumes that all NULL elements have been removed from the package.
 *
 *****************************************************************************/

static ACPI_STATUS
AcpiNsSortList (
    ACPI_OPERAND_OBJECT     **Elements,
    UINT32                  Count,
    UINT32                  Index,
    UINT8                   SortDirection)
{
    ACPI_OPERAND_OBJECT     *ObjDesc1;
    ACPI_OPERAND_OBJECT     *ObjDesc2;
    ACPI_OPERAND_OBJECT     *TempObj;
    UINT32                  i;
    UINT32                  j;


    /* Simple bubble sort */

    for (i = 1; i < Count; i++)
    {
        for (j = (Count - 1); j >= i; j--)
        {
            ObjDesc1 = Elements[j-1]->Package.Elements[Index];
            ObjDesc2 = Elements[j]->Package.Elements[Index];

            if (((SortDirection == ACPI_SORT_ASCENDING) &&
                    (ObjDesc1->Integer.Value > ObjDesc2->Integer.Value)) ||

                ((SortDirection == ACPI_SORT_DESCENDING) &&
                    (ObjDesc1->Integer.Value < ObjDesc2->Integer.Value)))
            {
                TempObj = Elements[j-1];
                Elements[j-1] = Elements[j];
                Elements[j] = TempObj;
            }
        }
    }

    return (AE_OK);
}