evgpeblk.c

acpi tools for linux include acpiexec and acpixtract

/******************************************************************************
 *
 * Module Name: evgpeblk - GPE block creation and initialization.
 *              $Revision: 1.62 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2008, 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.
 *
 *****************************************************************************/

#include "acpi.h"
#include "acevents.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
        ACPI_MODULE_NAME    ("evgpeblk")

/* Local prototypes */

static ACPI_STATUS
AcpiEvSaveMethodInfo (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *ObjDesc,
    void                    **ReturnValue);

static ACPI_STATUS
AcpiEvMatchPrwAndGpe (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *Info,
    void                    **ReturnValue);

static ACPI_GPE_XRUPT_INFO *
AcpiEvGetGpeXruptBlock (
    UINT32                  InterruptNumber);

static ACPI_STATUS
AcpiEvDeleteGpeXrupt (
    ACPI_GPE_XRUPT_INFO     *GpeXrupt);

static ACPI_STATUS
AcpiEvInstallGpeBlock (
    ACPI_GPE_BLOCK_INFO     *GpeBlock,
    UINT32                  InterruptNumber);

static ACPI_STATUS
AcpiEvCreateGpeInfoBlocks (
    ACPI_GPE_BLOCK_INFO     *GpeBlock);


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvValidGpeEvent
 *
 * PARAMETERS:  GpeEventInfo                - Info for this GPE
 *
 * RETURN:      TRUE if the GpeEvent is valid
 *
 * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
 *              Should be called only when the GPE lists are semaphore locked
 *              and not subject to change.
 *
 ******************************************************************************/

BOOLEAN
AcpiEvValidGpeEvent (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo)
{
    ACPI_GPE_XRUPT_INFO     *GpeXruptBlock;
    ACPI_GPE_BLOCK_INFO     *GpeBlock;


    ACPI_FUNCTION_ENTRY ();


    /* No need for spin lock since we are not changing any list elements */

    /* Walk the GPE interrupt levels */

    GpeXruptBlock = AcpiGbl_GpeXruptListHead;
    while (GpeXruptBlock)
    {
        GpeBlock = GpeXruptBlock->GpeBlockListHead;

        /* Walk the GPE blocks on this interrupt level */

        while (GpeBlock)
        {
            if ((&GpeBlock->EventInfo[0] <= GpeEventInfo) &&
                (&GpeBlock->EventInfo[((ACPI_SIZE) GpeBlock->RegisterCount) * 8] > GpeEventInfo))
            {
                return (TRUE);
            }

            GpeBlock = GpeBlock->Next;
        }

        GpeXruptBlock = GpeXruptBlock->Next;
    }

    return (FALSE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvWalkGpeList
 *
 * PARAMETERS:  GpeWalkCallback     - Routine called for each GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk the GPE lists.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvWalkGpeList (
    ACPI_GPE_CALLBACK       GpeWalkCallback)
{
    ACPI_GPE_BLOCK_INFO     *GpeBlock;
    ACPI_GPE_XRUPT_INFO     *GpeXruptInfo;
    ACPI_STATUS             Status = AE_OK;
    ACPI_CPU_FLAGS          Flags;


    ACPI_FUNCTION_TRACE (EvWalkGpeList);


    Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);

    /* Walk the interrupt level descriptor list */

    GpeXruptInfo = AcpiGbl_GpeXruptListHead;
    while (GpeXruptInfo)
    {
        /* Walk all Gpe Blocks attached to this interrupt level */

        GpeBlock = GpeXruptInfo->GpeBlockListHead;
        while (GpeBlock)
        {
            /* One callback per GPE block */

            Status = GpeWalkCallback (GpeXruptInfo, GpeBlock);
            if (ACPI_FAILURE (Status))
            {
                goto UnlockAndExit;
            }

            GpeBlock = GpeBlock->Next;
        }

        GpeXruptInfo = GpeXruptInfo->Next;
    }

UnlockAndExit:
    AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvDeleteGpeHandlers
 *
 * PARAMETERS:  GpeXruptInfo        - GPE Interrupt info
 *              GpeBlock            - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 *              Used only prior to termination.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvDeleteGpeHandlers (
    ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
    ACPI_GPE_BLOCK_INFO     *GpeBlock)
{
    ACPI_GPE_EVENT_INFO     *GpeEventInfo;
    ACPI_NATIVE_UINT        i;
    ACPI_NATIVE_UINT        j;


    ACPI_FUNCTION_TRACE (EvDeleteGpeHandlers);


    /* Examine each GPE Register within the block */

    for (i = 0; i < GpeBlock->RegisterCount; i++)
    {
        /* Now look at the individual GPEs in this byte register */

        for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
        {
            GpeEventInfo = &GpeBlock->EventInfo[(i * ACPI_GPE_REGISTER_WIDTH) + j];

            if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
                    ACPI_GPE_DISPATCH_HANDLER)
            {
                ACPI_FREE (GpeEventInfo->Dispatch.Handler);
                GpeEventInfo->Dispatch.Handler = NULL;
                GpeEventInfo->Flags &= ~ACPI_GPE_DISPATCH_MASK;
            }
        }
    }

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvSaveMethodInfo
 *
 * PARAMETERS:  Callback from WalkNamespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Called from AcpiWalkNamespace. Expects each object to be a
 *              control method under the _GPE portion of the namespace.
 *              Extract the name and GPE type from the object, saving this
 *              information for quick lookup during GPE dispatch
 *
 *              The name of each GPE control method is of the form:
 *              "_Lxx" or "_Exx"
 *              Where:
 *                  L      - means that the GPE is level triggered
 *                  E      - means that the GPE is edge triggered
 *                  xx     - is the GPE number [in HEX]
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiEvSaveMethodInfo (
    ACPI_HANDLE             ObjHandle,
    UINT32                  Level,
    void                    *ObjDesc,
    void                    **ReturnValue)
{
    ACPI_GPE_BLOCK_INFO     *GpeBlock = (void *) ObjDesc;
    ACPI_GPE_EVENT_INFO     *GpeEventInfo;
    UINT32                  GpeNumber;
    char                    Name[ACPI_NAME_SIZE + 1];
    UINT8                   Type;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (EvSaveMethodInfo);


    /*
     * _Lxx and _Exx GPE method support
     *
     * 1) Extract the name from the object and convert to a string
     */
    ACPI_MOVE_32_TO_32 (
        Name, &((ACPI_NAMESPACE_NODE *) ObjHandle)->Name.Integer);
    Name[ACPI_NAME_SIZE] = 0;

    /*
     * 2) Edge/Level determination is based on the 2nd character
     *    of the method name
     *
     * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
     * if a _PRW object is found that points to this GPE.
     */
    switch (Name[1])
    {
    case 'L':
        Type = ACPI_GPE_LEVEL_TRIGGERED;
        break;

    case 'E':
        Type = ACPI_GPE_EDGE_TRIGGERED;
        break;

    default:
        /* Unknown method type, just ignore it! */

        ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
            "Ignoring unknown GPE method type: %s (name not of form _Lxx or _Exx)",
            Name));
        return_ACPI_STATUS (AE_OK);
    }

    /* Convert the last two characters of the name to the GPE Number */

    GpeNumber = ACPI_STRTOUL (&Name[2], NULL, 16);
    if (GpeNumber == ACPI_UINT32_MAX)
    {
        /* Conversion failed; invalid method, just ignore it */

        ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
            "Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)",
            Name));
        return_ACPI_STATUS (AE_OK);
    }

    /* Ensure that we have a valid GPE number for this GPE block */

    if ((GpeNumber < GpeBlock->BlockBaseNumber) ||
        (GpeNumber >= (GpeBlock->BlockBaseNumber + (GpeBlock->RegisterCount * 8))))
    {
        /*
         * Not valid for this GPE block, just ignore it
         * However, it may be valid for a different GPE block, since GPE0 and GPE1
         * methods both appear under \_GPE.
         */
        return_ACPI_STATUS (AE_OK);
    }

    /*
     * Now we can add this information to the GpeEventInfo block
     * for use during dispatch of this GPE. Default type is RUNTIME, although
     * this may change when the _PRW methods are executed later.
     */
    GpeEventInfo = &GpeBlock->EventInfo[GpeNumber - GpeBlock->BlockBaseNumber];

    GpeEventInfo->Flags = (UINT8)
        (Type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);

    GpeEventInfo->Dispatch.MethodNode = (ACPI_NAMESPACE_NODE *) ObjHandle;

    /* Update enable mask, but don't enable the HW GPE as of yet */

    Status = AcpiEvEnableGpe (GpeEventInfo, FALSE);

    ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
        "Registered GPE method %s as GPE number 0x%.2X\n",
        Name, GpeNumber));
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvMatchPrwAndGpe
 *
 * PARAMETERS:  Callback from WalkNamespace
 *
 * RETURN:      Status. NOTE: We ignore errors so that the _PRW walk is
 *              not aborted on a single _PRW failure.
 *
 * DESCRIPTION: Called from AcpiWalkNamespace. Expects each object to be a
 *              Device. Run the _PRW method. If present, extract the GPE
 *              number and mark the GPE as a WAKE GPE.
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiEvMatchPrwAndGpe (