9874647ba1
Currently, during initialization ACPICA walks the entire ACPI namespace in search of any device objects with assciated _PRW methods. All of the _PRW methods found are executed in the process to extract the GPE information returned by them, so that the GPEs in question can be marked as "able to wakeup" (more precisely, the ACPI_GPE_CAN_WAKE flag is set for them). The only purpose of this exercise is to avoid enabling the CAN_WAKE GPEs automatically, even if there are _Lxx/_Exx methods associated with them. However, it is both costly and unnecessary, because the host OS has to execute the _PRW methods anyway to check which devices can wake up the system from sleep states. Moreover, it then uses full information returned by _PRW, including the GPE information, so it can take care of disabling the GPEs if necessary. Remove the code that walks the namespace and executes _PRW from ACPICA and modify comments to reflect that change. Make acpi_bus_set_run_wake_flags() disable GPEs for wakeup devices so that they don't cause spurious wakeup events to be signaled. This not only reduces the complexity of the ACPICA initialization code, but in some cases it should reduce the kernel boot time as well. Unfortunately, for this purpose we need a new ACPICA function, acpi_gpe_can_wake(), to be called by the host OS in order to disable the GPEs that can wake up the system and were previously enabled by acpi_ev_initialize_gpe_block() or acpi_ev_update_gpes() (such a GPE should be disabled only once, because the initialization code enables it only once, but it may be pointed to by _PRW for multiple devices and that's why the additional function is necessary). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
314 lines
9 KiB
C
314 lines
9 KiB
C
/******************************************************************************
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*
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* Module Name: evevent - Fixed Event handling and dispatch
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2010, 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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#define _COMPONENT ACPI_EVENTS
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ACPI_MODULE_NAME("evevent")
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/* Local prototypes */
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static acpi_status acpi_ev_fixed_event_initialize(void);
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static u32 acpi_ev_fixed_event_dispatch(u32 event);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_initialize_events
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
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*
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******************************************************************************/
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acpi_status acpi_ev_initialize_events(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_initialize_events);
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/*
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* Initialize the Fixed and General Purpose Events. This is done prior to
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* enabling SCIs to prevent interrupts from occurring before the handlers
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* are installed.
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*/
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status = acpi_ev_fixed_event_initialize();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Unable to initialize fixed events"));
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return_ACPI_STATUS(status);
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}
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status = acpi_ev_gpe_initialize();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Unable to initialize general purpose events"));
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return_ACPI_STATUS(status);
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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_install_fadt_gpes
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Completes initialization of the FADT-defined GPE blocks
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* (0 and 1). The HW must be fully initialized at this point,
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* including global lock support.
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*
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******************************************************************************/
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acpi_status acpi_ev_install_fadt_gpes(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_install_fadt_gpes);
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/* Namespace must be locked */
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* FADT GPE Block 0 */
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(void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
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acpi_gbl_gpe_fadt_blocks[0]);
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/* FADT GPE Block 1 */
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(void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
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acpi_gbl_gpe_fadt_blocks[1]);
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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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_install_xrupt_handlers
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
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*
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******************************************************************************/
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acpi_status acpi_ev_install_xrupt_handlers(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
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/* Install the SCI handler */
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status = acpi_ev_install_sci_handler();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Unable to install System Control Interrupt handler"));
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return_ACPI_STATUS(status);
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}
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/* Install the handler for the Global Lock */
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status = acpi_ev_init_global_lock_handler();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Unable to initialize Global Lock handler"));
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return_ACPI_STATUS(status);
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}
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acpi_gbl_events_initialized = TRUE;
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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_fixed_event_initialize
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Install the fixed event handlers and disable all fixed events.
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*
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******************************************************************************/
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static acpi_status acpi_ev_fixed_event_initialize(void)
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{
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u32 i;
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acpi_status status;
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/*
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* Initialize the structure that keeps track of fixed event handlers and
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* enable the fixed events.
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*/
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for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
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acpi_gbl_fixed_event_handlers[i].handler = NULL;
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acpi_gbl_fixed_event_handlers[i].context = NULL;
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/* Disable the fixed event */
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if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
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status =
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acpi_write_bit_register(acpi_gbl_fixed_event_info
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[i].enable_register_id,
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ACPI_DISABLE_EVENT);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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}
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_fixed_event_detect
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*
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* PARAMETERS: None
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*
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* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
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*
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* DESCRIPTION: Checks the PM status register for active fixed events
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*
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******************************************************************************/
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u32 acpi_ev_fixed_event_detect(void)
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{
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u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
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u32 fixed_status;
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u32 fixed_enable;
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u32 i;
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ACPI_FUNCTION_NAME(ev_fixed_event_detect);
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/*
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* Read the fixed feature status and enable registers, as all the cases
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* depend on their values. Ignore errors here.
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*/
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(void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
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(void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
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ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
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"Fixed Event Block: Enable %08X Status %08X\n",
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fixed_enable, fixed_status));
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/*
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* Check for all possible Fixed Events and dispatch those that are active
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*/
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for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
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/* Both the status and enable bits must be on for this event */
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if ((fixed_status & acpi_gbl_fixed_event_info[i].
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status_bit_mask)
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&& (fixed_enable & acpi_gbl_fixed_event_info[i].
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enable_bit_mask)) {
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/* Found an active (signalled) event */
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acpi_os_fixed_event_count(i);
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int_status |= acpi_ev_fixed_event_dispatch(i);
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}
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}
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return (int_status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_fixed_event_dispatch
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*
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* PARAMETERS: Event - Event type
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*
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* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
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*
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* DESCRIPTION: Clears the status bit for the requested event, calls the
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* handler that previously registered for the event.
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*
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******************************************************************************/
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static u32 acpi_ev_fixed_event_dispatch(u32 event)
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{
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ACPI_FUNCTION_ENTRY();
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/* Clear the status bit */
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(void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
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status_register_id, ACPI_CLEAR_STATUS);
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/*
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* Make sure we've got a handler. If not, report an error. The event is
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* disabled to prevent further interrupts.
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*/
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if (NULL == acpi_gbl_fixed_event_handlers[event].handler) {
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(void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
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enable_register_id,
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ACPI_DISABLE_EVENT);
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ACPI_ERROR((AE_INFO,
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"No installed handler for fixed event [0x%08X]",
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event));
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return (ACPI_INTERRUPT_NOT_HANDLED);
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}
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/* Invoke the Fixed Event handler */
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return ((acpi_gbl_fixed_event_handlers[event].
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handler) (acpi_gbl_fixed_event_handlers[event].context));
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}
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