856 lines
24 KiB
C
856 lines
24 KiB
C
/******************************************************************************
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*
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* Module Name: evgpe - General Purpose Event handling and dispatch
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2017, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acevents.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_EVENTS
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ACPI_MODULE_NAME("evgpe")
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#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
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/* Local prototypes */
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static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
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static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_update_gpe_enable_mask
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*
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* PARAMETERS: gpe_event_info - GPE to update
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*
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* RETURN: Status
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*
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* DESCRIPTION: Updates GPE register enable mask based upon whether there are
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* runtime references to this GPE
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*
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******************************************************************************/
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acpi_status
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acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
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{
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struct acpi_gpe_register_info *gpe_register_info;
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u32 register_bit;
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ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);
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gpe_register_info = gpe_event_info->register_info;
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if (!gpe_register_info) {
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
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/* Clear the run bit up front */
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ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
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/* Set the mask bit only if there are references to this GPE */
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if (gpe_event_info->runtime_count) {
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ACPI_SET_BIT(gpe_register_info->enable_for_run,
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(u8)register_bit);
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}
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gpe_register_info->enable_mask = gpe_register_info->enable_for_run;
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_enable_gpe
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*
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* PARAMETERS: gpe_event_info - GPE to enable
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*
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* RETURN: Status
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*
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* DESCRIPTION: Clear a GPE of stale events and enable it.
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*
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******************************************************************************/
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acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_enable_gpe);
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/* Clear the GPE (of stale events) */
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status = acpi_hw_clear_gpe(gpe_event_info);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Enable the requested GPE */
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status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_mask_gpe
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*
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* PARAMETERS: gpe_event_info - GPE to be blocked/unblocked
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* is_masked - Whether the GPE is masked or not
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*
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* RETURN: Status
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*
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* DESCRIPTION: Unconditionally mask/unmask a GPE during runtime.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked)
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{
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struct acpi_gpe_register_info *gpe_register_info;
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u32 register_bit;
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ACPI_FUNCTION_TRACE(ev_mask_gpe);
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gpe_register_info = gpe_event_info->register_info;
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if (!gpe_register_info) {
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
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/* Perform the action */
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if (is_masked) {
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if (register_bit & gpe_register_info->mask_for_run) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
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ACPI_SET_BIT(gpe_register_info->mask_for_run, (u8)register_bit);
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} else {
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if (!(register_bit & gpe_register_info->mask_for_run)) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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ACPI_CLEAR_BIT(gpe_register_info->mask_for_run,
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(u8)register_bit);
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if (gpe_event_info->runtime_count
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&& !gpe_event_info->disable_for_dispatch) {
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(void)acpi_hw_low_set_gpe(gpe_event_info,
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ACPI_GPE_ENABLE);
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}
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_add_gpe_reference
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*
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* PARAMETERS: gpe_event_info - Add a reference to this GPE
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*
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* RETURN: Status
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*
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* DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
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* hardware-enabled.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(ev_add_gpe_reference);
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if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
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return_ACPI_STATUS(AE_LIMIT);
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}
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gpe_event_info->runtime_count++;
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if (gpe_event_info->runtime_count == 1) {
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/* Enable on first reference */
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status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
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if (ACPI_SUCCESS(status)) {
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status = acpi_ev_enable_gpe(gpe_event_info);
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}
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if (ACPI_FAILURE(status)) {
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gpe_event_info->runtime_count--;
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}
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_remove_gpe_reference
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*
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* PARAMETERS: gpe_event_info - Remove a reference to this GPE
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*
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* RETURN: Status
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*
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* DESCRIPTION: Remove a reference to a GPE. When the last reference is
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* removed, the GPE is hardware-disabled.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(ev_remove_gpe_reference);
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if (!gpe_event_info->runtime_count) {
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return_ACPI_STATUS(AE_LIMIT);
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}
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gpe_event_info->runtime_count--;
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if (!gpe_event_info->runtime_count) {
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/* Disable on last reference */
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status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
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if (ACPI_SUCCESS(status)) {
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status =
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acpi_hw_low_set_gpe(gpe_event_info,
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ACPI_GPE_DISABLE);
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}
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if (ACPI_FAILURE(status)) {
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gpe_event_info->runtime_count++;
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}
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_low_get_gpe_info
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*
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* PARAMETERS: gpe_number - Raw GPE number
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* gpe_block - A GPE info block
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*
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* RETURN: A GPE event_info struct. NULL if not a valid GPE (The gpe_number
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* is not within the specified GPE block)
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*
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* DESCRIPTION: Returns the event_info struct associated with this GPE. This is
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* the low-level implementation of ev_get_gpe_event_info.
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*
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******************************************************************************/
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struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
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struct acpi_gpe_block_info
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*gpe_block)
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{
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u32 gpe_index;
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/*
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* Validate that the gpe_number is within the specified gpe_block.
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* (Two steps)
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*/
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if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
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return (NULL);
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}
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gpe_index = gpe_number - gpe_block->block_base_number;
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if (gpe_index >= gpe_block->gpe_count) {
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return (NULL);
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}
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return (&gpe_block->event_info[gpe_index]);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_get_gpe_event_info
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*
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* PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
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* gpe_number - Raw GPE number
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*
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* RETURN: A GPE event_info struct. NULL if not a valid GPE
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*
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* DESCRIPTION: Returns the event_info struct associated with this GPE.
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* Validates the gpe_block and the gpe_number
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*
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* Should be called only when the GPE lists are semaphore locked
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* and not subject to change.
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*
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******************************************************************************/
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struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
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u32 gpe_number)
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{
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union acpi_operand_object *obj_desc;
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struct acpi_gpe_event_info *gpe_info;
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u32 i;
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ACPI_FUNCTION_ENTRY();
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/* A NULL gpe_device means use the FADT-defined GPE block(s) */
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if (!gpe_device) {
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/* Examine GPE Block 0 and 1 (These blocks are permanent) */
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for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
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gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
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acpi_gbl_gpe_fadt_blocks
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[i]);
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if (gpe_info) {
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return (gpe_info);
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}
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}
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/* The gpe_number was not in the range of either FADT GPE block */
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return (NULL);
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}
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/* A Non-NULL gpe_device means this is a GPE Block Device */
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obj_desc =
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acpi_ns_get_attached_object((struct acpi_namespace_node *)
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gpe_device);
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if (!obj_desc || !obj_desc->device.gpe_block) {
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return (NULL);
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}
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return (acpi_ev_low_get_gpe_info
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(gpe_number, obj_desc->device.gpe_block));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_gpe_detect
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*
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* PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt.
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* Can have multiple GPE blocks attached.
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*
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* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
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*
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* DESCRIPTION: Detect if any GP events have occurred. This function is
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* executed at interrupt level.
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*
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******************************************************************************/
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u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)
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{
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acpi_status status;
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struct acpi_gpe_block_info *gpe_block;
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struct acpi_namespace_node *gpe_device;
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struct acpi_gpe_register_info *gpe_register_info;
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struct acpi_gpe_event_info *gpe_event_info;
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u32 gpe_number;
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struct acpi_gpe_handler_info *gpe_handler_info;
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u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
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u8 enabled_status_byte;
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u32 status_reg;
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u32 enable_reg;
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acpi_cpu_flags flags;
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u32 i;
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u32 j;
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ACPI_FUNCTION_NAME(ev_gpe_detect);
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/* Check for the case where there are no GPEs */
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if (!gpe_xrupt_list) {
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return (int_status);
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}
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/*
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* We need to obtain the GPE lock for both the data structs and registers
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* Note: Not necessary to obtain the hardware lock, since the GPE
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* registers are owned by the gpe_lock.
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*/
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flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
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/* Examine all GPE blocks attached to this interrupt level */
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gpe_block = gpe_xrupt_list->gpe_block_list_head;
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while (gpe_block) {
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gpe_device = gpe_block->node;
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/*
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* Read all of the 8-bit GPE status and enable registers in this GPE
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* block, saving all of them. Find all currently active GP events.
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*/
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for (i = 0; i < gpe_block->register_count; i++) {
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/* Get the next status/enable pair */
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gpe_register_info = &gpe_block->register_info[i];
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/*
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* Optimization: If there are no GPEs enabled within this
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* register, we can safely ignore the entire register.
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*/
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if (!(gpe_register_info->enable_for_run |
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gpe_register_info->enable_for_wake)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
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"Ignore disabled registers for GPE %02X-%02X: "
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"RunEnable=%02X, WakeEnable=%02X\n",
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gpe_register_info->
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base_gpe_number,
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gpe_register_info->
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base_gpe_number +
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(ACPI_GPE_REGISTER_WIDTH - 1),
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gpe_register_info->
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enable_for_run,
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gpe_register_info->
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enable_for_wake));
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continue;
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}
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/* Read the Status Register */
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status =
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acpi_hw_read(&status_reg,
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&gpe_register_info->status_address);
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if (ACPI_FAILURE(status)) {
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goto unlock_and_exit;
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}
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/* Read the Enable Register */
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status =
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acpi_hw_read(&enable_reg,
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&gpe_register_info->enable_address);
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if (ACPI_FAILURE(status)) {
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goto unlock_and_exit;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
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"Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, "
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"RunEnable=%02X, WakeEnable=%02X\n",
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gpe_register_info->base_gpe_number,
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gpe_register_info->base_gpe_number +
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(ACPI_GPE_REGISTER_WIDTH - 1),
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status_reg, enable_reg,
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gpe_register_info->enable_for_run,
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gpe_register_info->enable_for_wake));
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/* Check if there is anything active at all in this register */
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enabled_status_byte = (u8)(status_reg & enable_reg);
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if (!enabled_status_byte) {
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/* No active GPEs in this register, move on */
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continue;
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}
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/* Now look at the individual GPEs in this byte register */
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for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
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/* Examine one GPE bit */
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gpe_event_info =
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&gpe_block->
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event_info[((acpi_size)i *
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ACPI_GPE_REGISTER_WIDTH) + j];
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gpe_number =
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j + gpe_register_info->base_gpe_number;
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if (enabled_status_byte & (1 << j)) {
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/* Invoke global event handler if present */
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acpi_gpe_count++;
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if (acpi_gbl_global_event_handler) {
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acpi_gbl_global_event_handler
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(ACPI_EVENT_TYPE_GPE,
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gpe_device, gpe_number,
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acpi_gbl_global_event_handler_context);
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}
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/* Found an active GPE */
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if (ACPI_GPE_DISPATCH_TYPE
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(gpe_event_info->flags) ==
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ACPI_GPE_DISPATCH_RAW_HANDLER) {
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/* Dispatch the event to a raw handler */
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gpe_handler_info =
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gpe_event_info->dispatch.
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handler;
|
|
|
|
/*
|
|
* There is no protection around the namespace node
|
|
* and the GPE handler to ensure a safe destruction
|
|
* because:
|
|
* 1. The namespace node is expected to always
|
|
* exist after loading a table.
|
|
* 2. The GPE handler is expected to be flushed by
|
|
* acpi_os_wait_events_complete() before the
|
|
* destruction.
|
|
*/
|
|
acpi_os_release_lock
|
|
(acpi_gbl_gpe_lock, flags);
|
|
int_status |=
|
|
gpe_handler_info->
|
|
address(gpe_device,
|
|
gpe_number,
|
|
gpe_handler_info->
|
|
context);
|
|
flags =
|
|
acpi_os_acquire_lock
|
|
(acpi_gbl_gpe_lock);
|
|
} else {
|
|
/*
|
|
* Dispatch the event to a standard handler or
|
|
* method.
|
|
*/
|
|
int_status |=
|
|
acpi_ev_gpe_dispatch
|
|
(gpe_device, gpe_event_info,
|
|
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 = AE_OK;
|
|
struct acpi_evaluate_info *info;
|
|
struct acpi_gpe_notify_info *notify;
|
|
|
|
ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
|
|
|
|
/* Do the correct dispatch - normal method or implicit notify */
|
|
|
|
switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
|
|
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 = 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 =
|
|
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(gpe_event_info->
|
|
dispatch.
|
|
method_node)));
|
|
}
|
|
break;
|
|
|
|
default:
|
|
|
|
goto error_exit; /* 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, gpe_event_info);
|
|
if (ACPI_SUCCESS(status)) {
|
|
return_VOID;
|
|
}
|
|
|
|
error_exit:
|
|
acpi_ev_asynch_enable_gpe(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;
|
|
acpi_cpu_flags flags;
|
|
|
|
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
|
|
(void)acpi_ev_finish_gpe(gpe_event_info);
|
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
|
|
|
|
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_mask bit is set
|
|
* in the event_info.
|
|
*/
|
|
(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE);
|
|
gpe_event_info->disable_for_dispatch = FALSE;
|
|
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);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* 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));
|
|
(void)acpi_hw_low_set_gpe(gpe_event_info,
|
|
ACPI_GPE_CONDITIONAL_ENABLE);
|
|
return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
|
|
}
|
|
}
|
|
|
|
gpe_event_info->disable_for_dispatch = TRUE;
|
|
|
|
/*
|
|
* 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 (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
|
|
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 %02X - 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 */
|