evgpe.c

Go to the documentation of this file.

/******************************************************************************
 *
 * Module Name: evgpe - General Purpose Event handling and dispatch
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpe")
#if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
/* Local prototypes */
static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_update_gpe_enable_mask
 *
 * PARAMETERS:  gpe_event_info          - GPE to update
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Updates GPE register enable mask based upon whether there are
 *              runtime references to this GPE
 *
 ******************************************************************************/

acpi_status
acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
{
    struct acpi_gpe_register_info *gpe_register_info;
    u32 register_bit;

    ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);

    gpe_register_info = gpe_event_info->register_info;
    if (!gpe_register_info) {
        return_ACPI_STATUS(AE_NOT_EXIST);
    }

    register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);

    /* Clear the run bit up front */

    ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);

    /* Set the mask bit only if there are references to this GPE */

    if (gpe_event_info->runtime_count) {
        ACPI_SET_BIT(gpe_register_info->enable_for_run, (u8)register_bit);
    }

    return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_enable_gpe
 *
 * PARAMETERS:  gpe_event_info  - GPE to enable
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear a GPE of stale events and enable it.
 *
 ******************************************************************************/
acpi_status
acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
    acpi_status status;

    ACPI_FUNCTION_TRACE(ev_enable_gpe);

    /*
     * We will only allow a GPE to be enabled if it has either an associated
     * method (_Lxx/_Exx) or a handler, or is using the implicit notify
     * feature. Otherwise, the GPE will be immediately disabled by
     * acpi_ev_gpe_dispatch the first time it fires.
     */
    if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
        ACPI_GPE_DISPATCH_NONE) {
        return_ACPI_STATUS(AE_NO_HANDLER);
    }

    /* Clear the GPE (of stale events) */
    status = acpi_hw_clear_gpe(gpe_event_info);
    if (ACPI_FAILURE(status)) {
        return_ACPI_STATUS(status);
    }

    /* Enable the requested GPE */
    status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);

    return_ACPI_STATUS(status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_add_gpe_reference
 *
 * PARAMETERS:  gpe_event_info          - Add a reference to this GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 *              hardware-enabled.
 *
 ******************************************************************************/

acpi_status acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
{
    acpi_status status = AE_OK;

    ACPI_FUNCTION_TRACE(ev_add_gpe_reference);

    if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
        return_ACPI_STATUS(AE_LIMIT);
    }

    gpe_event_info->runtime_count++;
    if (gpe_event_info->runtime_count == 1) {

        /* Enable on first reference */

        status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
        if (ACPI_SUCCESS(status)) {
            status = acpi_ev_enable_gpe(gpe_event_info);
        }

        if (ACPI_FAILURE(status)) {
            gpe_event_info->runtime_count--;
        }
    }

    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_remove_gpe_reference
 *
 * PARAMETERS:  gpe_event_info          - Remove a reference to this GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 *              removed, the GPE is hardware-disabled.
 *
 ******************************************************************************/

acpi_status acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
{
    acpi_status status = AE_OK;

    ACPI_FUNCTION_TRACE(ev_remove_gpe_reference);

    if (!gpe_event_info->runtime_count) {
        return_ACPI_STATUS(AE_LIMIT);
    }

    gpe_event_info->runtime_count--;
    if (!gpe_event_info->runtime_count) {

        /* Disable on last reference */

        status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
        if (ACPI_SUCCESS(status)) {
            status = acpi_hw_low_set_gpe(gpe_event_info,
                             ACPI_GPE_DISABLE);
        }

        if (ACPI_FAILURE(status)) {
            gpe_event_info->runtime_count++;
        }
    }

    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_low_get_gpe_info
 *
 * PARAMETERS:  gpe_number          - Raw GPE number
 *              gpe_block           - A GPE info block
 *
 * RETURN:      A GPE event_info struct. NULL if not a valid GPE (The gpe_number
 *              is not within the specified GPE block)
 *
 * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
 *              the low-level implementation of ev_get_gpe_event_info.
 *
 ******************************************************************************/

struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
                             struct acpi_gpe_block_info
                             *gpe_block)
{
    u32 gpe_index;

    /*
     * Validate that the gpe_number is within the specified gpe_block.
     * (Two steps)
     */
    if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
        return (NULL);
    }

    gpe_index = gpe_number - gpe_block->block_base_number;
    if (gpe_index >= gpe_block->gpe_count) {
        return (NULL);
    }

    return (&gpe_block->event_info[gpe_index]);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_get_gpe_event_info
 *
 * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
 *              gpe_number          - Raw GPE number
 *
 * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 *
 * DESCRIPTION: Returns the event_info struct associated with this GPE.
 *              Validates the gpe_block and the gpe_number
 *
 *              Should be called only when the GPE lists are semaphore locked
 *              and not subject to change.
 *
 ******************************************************************************/

struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
                               u32 gpe_number)
{
    union acpi_operand_object *obj_desc;
    struct acpi_gpe_event_info *gpe_info;
    u32 i;

    ACPI_FUNCTION_ENTRY();

    /* A NULL gpe_device means use the FADT-defined GPE block(s) */

    if (!gpe_device) {

        /* Examine GPE Block 0 and 1 (These blocks are permanent) */

        for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
            gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
                                acpi_gbl_gpe_fadt_blocks
                                [i]);
            if (gpe_info) {
                return (gpe_info);
            }
        }

        /* The gpe_number was not in the range of either FADT GPE block */

        return (NULL);
    }

    /* A Non-NULL gpe_device means this is a GPE Block Device */

    obj_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)
                           gpe_device);
    if (!obj_desc || !obj_desc->device.gpe_block) {
        return (NULL);
    }

    return (acpi_ev_low_get_gpe_info
        (gpe_number, obj_desc->device.gpe_block));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_detect
 *
 * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 *                                    Can have multiple GPE blocks attached.
 *
 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 *
 * DESCRIPTION: Detect if any GP events have occurred. This function is
 *              executed at interrupt level.
 *
 ******************************************************************************/

u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
{
    acpi_status status;
    struct acpi_gpe_block_info *gpe_block;
    struct acpi_gpe_register_info *gpe_register_info;
    u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
    u8 enabled_status_byte;
    u32 status_reg;
    u32 enable_reg;
    acpi_cpu_flags flags;
    u32 i;
    u32 j;

    ACPI_FUNCTION_NAME(ev_gpe_detect);

    /* Check for the case where there are no GPEs */

    if (!gpe_xrupt_list) {
        return (int_status);
    }

    /*
     * We need to obtain the GPE lock for both the data structs and registers
     * Note: Not necessary to obtain the hardware lock, since the GPE
     * registers are owned by the gpe_lock.
     */
    flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

    /* Examine all GPE blocks attached to this interrupt level */

    gpe_block = gpe_xrupt_list->gpe_block_list_head;
    while (gpe_block) {
        /*
         * Read all of the 8-bit GPE status and enable registers in this GPE
         * block, saving all of them. Find all currently active GP events.
         */
        for (i = 0; i < gpe_block->register_count; i++) {

            /* Get the next status/enable pair */

            gpe_register_info = &gpe_block->register_info[i];

            /*
             * Optimization: If there are no GPEs enabled within this
             * register, we can safely ignore the entire register.
             */
            if (!(gpe_register_info->enable_for_run |
                  gpe_register_info->enable_for_wake)) {
                ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
                          "Ignore disabled registers for GPE%02X-GPE%02X: "
                          "RunEnable=%02X, WakeEnable=%02X\n",
                          gpe_register_info->
                          base_gpe_number,
                          gpe_register_info->
                          base_gpe_number +
                          (ACPI_GPE_REGISTER_WIDTH - 1),
                          gpe_register_info->
                          enable_for_run,
                          gpe_register_info->
                          enable_for_wake));
                continue;
            }

            /* Read the Status Register */

            status =
                acpi_hw_read(&status_reg,
                     &gpe_register_info->status_address);
            if (ACPI_FAILURE(status)) {
                goto unlock_and_exit;
            }

            /* Read the Enable Register */

            status =
                acpi_hw_read(&enable_reg,
                     &gpe_register_info->enable_address);
            if (ACPI_FAILURE(status)) {
                goto unlock_and_exit;
            }

            ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
                      "Read registers for GPE%02X-GPE%02X: Status=%02X, Enable=%02X, "
                      "RunEnable=%02X, WakeEnable=%02X\n",
                      gpe_register_info->base_gpe_number,
                      gpe_register_info->base_gpe_number +
                      (ACPI_GPE_REGISTER_WIDTH - 1),
                      status_reg, enable_reg,
                      gpe_register_info->enable_for_run,
                      gpe_register_info->enable_for_wake));

            /* Check if there is anything active at all in this register */

            enabled_status_byte = (u8) (status_reg & enable_reg);
            if (!enabled_status_byte) {

                /* No active GPEs in this register, move on */

                continue;
            }

            /* Now look at the individual GPEs in this byte register */

            for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {

                /* Examine one GPE bit */

                if (enabled_status_byte & (1 << j)) {
                    /*
                     * Found an active GPE. Dispatch the event to a handler
                     * or method.
                     */
                    int_status |=
                        acpi_ev_gpe_dispatch(gpe_block->
                                 node,
                                 &gpe_block->
                        event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number);
                }
            }
        }

        gpe_block = gpe_block->next;
    }

      unlock_and_exit:

    acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
    return (int_status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 *
 * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 *
 * RETURN:      None
 *
 * DESCRIPTION: Perform the actual execution of a GPE control method. This
 *              function is called from an invocation of acpi_os_execute and
 *              therefore does NOT execute at interrupt level - so that
 *              the control method itself is not executed in the context of
 *              an interrupt handler.
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
{
    struct acpi_gpe_event_info *gpe_event_info = context;
    acpi_status status;
    struct acpi_gpe_event_info *local_gpe_event_info;
    struct acpi_evaluate_info *info;
    struct acpi_gpe_notify_info *notify;

    ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);

    /* Allocate a local GPE block */

    local_gpe_event_info =
        ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_event_info));
    if (!local_gpe_event_info) {
        ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, "while handling a GPE"));
        return_VOID;
    }

    status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
    if (ACPI_FAILURE(status)) {
        ACPI_FREE(local_gpe_event_info);
        return_VOID;
    }

    /* Must revalidate the gpe_number/gpe_block */

    if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
        status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
        ACPI_FREE(local_gpe_event_info);
        return_VOID;
    }

    /*
     * Take a snapshot of the GPE info for this level - we copy the info to
     * prevent a race condition with remove_handler/remove_block.
     */
    ACPI_MEMCPY(local_gpe_event_info, gpe_event_info,
            sizeof(struct acpi_gpe_event_info));

    status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
    if (ACPI_FAILURE(status)) {
        return_VOID;
    }

    /* Do the correct dispatch - normal method or implicit notify */

    switch (local_gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
    case ACPI_GPE_DISPATCH_NOTIFY:

        /*
         * Implicit notify.
         * Dispatch a DEVICE_WAKE notify to the appropriate handler.
         * NOTE: the request is queued for execution after this method
         * completes. The notify handlers are NOT invoked synchronously
         * from this thread -- because handlers may in turn run other
         * control methods.
         *
         * June 2012: Expand implicit notify mechanism to support
         * notifies on multiple device objects.
         */
        notify = local_gpe_event_info->dispatch.notify_list;
        while (ACPI_SUCCESS(status) && notify) {
            status =
                acpi_ev_queue_notify_request(notify->device_node,
                             ACPI_NOTIFY_DEVICE_WAKE);

            notify = notify->next;
        }

        break;

    case ACPI_GPE_DISPATCH_METHOD:

        /* Allocate the evaluation information block */

        info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
        if (!info) {
            status = AE_NO_MEMORY;
        } else {
            /*
             * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
             * control method that corresponds to this GPE
             */
            info->prefix_node =
                local_gpe_event_info->dispatch.method_node;
            info->flags = ACPI_IGNORE_RETURN_VALUE;

            status = acpi_ns_evaluate(info);
            ACPI_FREE(info);
        }

        if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status,
                    "while evaluating GPE method [%4.4s]",
                    acpi_ut_get_node_name
                    (local_gpe_event_info->dispatch.
                     method_node)));
        }

        break;

    default:
        return_VOID;    /* Should never happen */
    }

    /* Defer enabling of GPE until all notify handlers are done */

    status = acpi_os_execute(OSL_NOTIFY_HANDLER,
                 acpi_ev_asynch_enable_gpe,
                 local_gpe_event_info);
    if (ACPI_FAILURE(status)) {
        ACPI_FREE(local_gpe_event_info);
    }
    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_asynch_enable_gpe
 *
 * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 *              Callback from acpi_os_execute
 *
 * RETURN:      None
 *
 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
 *              complete (i.e., finish execution of Notify)
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context)
{
    struct acpi_gpe_event_info *gpe_event_info = context;

    (void)acpi_ev_finish_gpe(gpe_event_info);

    ACPI_FREE(gpe_event_info);
    return;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_finish_gpe
 *
 * PARAMETERS:  gpe_event_info      - Info for this GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
 *              of a GPE method or a synchronous or asynchronous GPE handler.
 *
 ******************************************************************************/

acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
    acpi_status status;

    if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
        ACPI_GPE_LEVEL_TRIGGERED) {
        /*
         * GPE is level-triggered, we clear the GPE status bit after
         * handling the event.
         */
        status = acpi_hw_clear_gpe(gpe_event_info);
        if (ACPI_FAILURE(status)) {
            return (status);
        }
    }

    /*
     * Enable this GPE, conditionally. This means that the GPE will
     * only be physically enabled if the enable_for_run bit is set
     * in the event_info.
     */
    (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE);
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_dispatch
 *
 * PARAMETERS:  gpe_device      - Device node. NULL for GPE0/GPE1
 *              gpe_event_info  - Info for this GPE
 *              gpe_number      - Number relative to the parent GPE block
 *
 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 *
 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 *              or method (e.g. _Lxx/_Exx) handler.
 *
 *              This function executes at interrupt level.
 *
 ******************************************************************************/

u32
acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device,
            struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
{
    acpi_status status;
    u32 return_value;

    ACPI_FUNCTION_TRACE(ev_gpe_dispatch);

    /* Invoke global event handler if present */

    acpi_gpe_count++;
    if (acpi_gbl_global_event_handler) {
        acpi_gbl_global_event_handler(ACPI_EVENT_TYPE_GPE, gpe_device,
                          gpe_number,
                          acpi_gbl_global_event_handler_context);
    }

    /*
     * If edge-triggered, clear the GPE status bit now. Note that
     * level-triggered events are cleared after the GPE is serviced.
     */
    if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
        ACPI_GPE_EDGE_TRIGGERED) {
        status = acpi_hw_clear_gpe(gpe_event_info);
        if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status,
                    "Unable to clear GPE%02X", gpe_number));
            return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
        }
    }

    /*
     * Always disable the GPE so that it does not keep firing before
     * any asynchronous activity completes (either from the execution
     * of a GPE method or an asynchronous GPE handler.)
     *
     * If there is no handler or method to run, just disable the
     * GPE and leave it disabled permanently to prevent further such
     * pointless events from firing.
     */
    status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
    if (ACPI_FAILURE(status)) {
        ACPI_EXCEPTION((AE_INFO, status,
                "Unable to disable GPE%02X", gpe_number));
        return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
    }

    /*
     * Dispatch the GPE to either an installed handler or the control
     * method associated with this GPE (_Lxx or _Exx). If a handler
     * exists, we invoke it and do not attempt to run the method.
     * If there is neither a handler nor a method, leave the GPE
     * disabled.
     */
    switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
    case ACPI_GPE_DISPATCH_HANDLER:

        /* Invoke the installed handler (at interrupt level) */

        return_value =
            gpe_event_info->dispatch.handler->address(gpe_device,
                                  gpe_number,
                                  gpe_event_info->
                                  dispatch.handler->
                                  context);

        /* If requested, clear (if level-triggered) and reenable the GPE */

        if (return_value & ACPI_REENABLE_GPE) {
            (void)acpi_ev_finish_gpe(gpe_event_info);
        }
        break;

    case ACPI_GPE_DISPATCH_METHOD:
    case ACPI_GPE_DISPATCH_NOTIFY:

        /*
         * Execute the method associated with the GPE
         * NOTE: Level-triggered GPEs are cleared after the method completes.
         */
        status = acpi_os_execute(OSL_GPE_HANDLER,
                     acpi_ev_asynch_execute_gpe_method,
                     gpe_event_info);
        if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status,
                    "Unable to queue handler for GPE%2X - event disabled",
                    gpe_number));
        }
        break;

    default:

        /*
         * No handler or method to run!
         * 03/2010: This case should no longer be possible. We will not allow
         * a GPE to be enabled if it has no handler or method.
         */
        ACPI_ERROR((AE_INFO,
                "No handler or method for GPE%02X, disabling event",
                gpe_number));

        break;
    }

    return_UINT32(ACPI_INTERRUPT_HANDLED);
}

#endif              /* !ACPI_REDUCED_HARDWARE */