445 строки
14 KiB
C
445 строки
14 KiB
C
/******************************************************************************
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*
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* Module Name: evgpeinit - System GPE initialization and update
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, 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("evgpeinit")
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#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
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/*
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* Note: History of _PRW support in ACPICA
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*
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* Originally (2000 - 2010), the GPE initialization code performed a walk of
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* the entire namespace to execute the _PRW methods and detect all GPEs
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* capable of waking the system.
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*
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* As of 10/2010, the _PRW method execution has been removed since it is
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* actually unnecessary. The host OS must in fact execute all _PRW methods
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* in order to identify the device/power-resource dependencies. We now put
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* the onus on the host OS to identify the wake GPEs as part of this process
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* and to inform ACPICA of these GPEs via the acpi_setup_gpe_for_wake interface. This
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* not only reduces the complexity of the ACPICA initialization code, but in
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* some cases (on systems with very large namespaces) it should reduce the
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* kernel boot time as well.
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*/
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_gpe_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: Initialize the GPE data structures and the FADT GPE 0/1 blocks
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*
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******************************************************************************/
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acpi_status acpi_ev_gpe_initialize(void)
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{
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u32 register_count0 = 0;
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u32 register_count1 = 0;
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u32 gpe_number_max = 0;
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_gpe_initialize);
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
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"Initializing General Purpose Events (GPEs):\n"));
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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_ACPI_STATUS(status);
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}
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/*
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* Initialize the GPE Block(s) defined in the FADT
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*
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* Why the GPE register block lengths are divided by 2: From the ACPI
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* Spec, section "General-Purpose Event Registers", we have:
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*
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* "Each register block contains two registers of equal length
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* GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
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* GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
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* The length of the GPE1_STS and GPE1_EN registers is equal to
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* half the GPE1_LEN. If a generic register block is not supported
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* then its respective block pointer and block length values in the
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* FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
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* to be the same size."
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*/
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/*
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* Determine the maximum GPE number for this machine.
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*
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* Note: both GPE0 and GPE1 are optional, and either can exist without
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* the other.
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*
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* If EITHER the register length OR the block address are zero, then that
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* particular block is not supported.
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*/
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if (acpi_gbl_FADT.gpe0_block_length &&
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acpi_gbl_FADT.xgpe0_block.address) {
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/* GPE block 0 exists (has both length and address > 0) */
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register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2);
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gpe_number_max =
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(register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
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/* Install GPE Block 0 */
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status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
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acpi_gbl_FADT.xgpe0_block.
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address,
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acpi_gbl_FADT.xgpe0_block.
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space_id, register_count0, 0,
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acpi_gbl_FADT.sci_interrupt,
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&acpi_gbl_gpe_fadt_blocks[0]);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not create GPE Block 0"));
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}
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}
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if (acpi_gbl_FADT.gpe1_block_length &&
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acpi_gbl_FADT.xgpe1_block.address) {
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/* GPE block 1 exists (has both length and address > 0) */
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register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2);
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/* Check for GPE0/GPE1 overlap (if both banks exist) */
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if ((register_count0) &&
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(gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
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ACPI_ERROR((AE_INFO,
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"GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
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"(GPE %u to %u) - Ignoring GPE1",
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gpe_number_max, acpi_gbl_FADT.gpe1_base,
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acpi_gbl_FADT.gpe1_base +
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((register_count1 *
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ACPI_GPE_REGISTER_WIDTH) - 1)));
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/* Ignore GPE1 block by setting the register count to zero */
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register_count1 = 0;
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} else {
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/* Install GPE Block 1 */
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status =
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acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
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acpi_gbl_FADT.xgpe1_block.
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address,
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acpi_gbl_FADT.xgpe1_block.
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space_id, register_count1,
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acpi_gbl_FADT.gpe1_base,
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acpi_gbl_FADT.
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sci_interrupt,
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&acpi_gbl_gpe_fadt_blocks
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[1]);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not create GPE Block 1"));
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}
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/*
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* GPE0 and GPE1 do not have to be contiguous in the GPE number
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* space. However, GPE0 always starts at GPE number zero.
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*/
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gpe_number_max = acpi_gbl_FADT.gpe1_base +
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((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
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}
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}
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/* Exit if there are no GPE registers */
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if ((register_count0 + register_count1) == 0) {
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/* GPEs are not required by ACPI, this is OK */
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ACPI_DEBUG_PRINT((ACPI_DB_INIT,
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"There are no GPE blocks defined in the FADT\n"));
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status = AE_OK;
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goto cleanup;
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}
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cleanup:
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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_update_gpes
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*
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* PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table
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*
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* RETURN: None
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*
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* DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
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* result of a Load() or load_table() operation. If new GPE
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* methods have been installed, register the new methods.
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*
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******************************************************************************/
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void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
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{
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struct acpi_gpe_xrupt_info *gpe_xrupt_info;
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struct acpi_gpe_block_info *gpe_block;
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struct acpi_gpe_walk_info walk_info;
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acpi_status status = AE_OK;
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/*
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* Find any _Lxx/_Exx GPE methods that have just been loaded.
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*
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* Any GPEs that correspond to new _Lxx/_Exx methods are immediately
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* enabled.
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*
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* Examine the namespace underneath each gpe_device within the
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* gpe_block lists.
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*/
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status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
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if (ACPI_FAILURE(status)) {
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return;
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}
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walk_info.count = 0;
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walk_info.owner_id = table_owner_id;
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walk_info.execute_by_owner_id = TRUE;
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/* Walk the interrupt level descriptor list */
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gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
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while (gpe_xrupt_info) {
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/* Walk all Gpe Blocks attached to this interrupt level */
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gpe_block = gpe_xrupt_info->gpe_block_list_head;
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while (gpe_block) {
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walk_info.gpe_block = gpe_block;
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walk_info.gpe_device = gpe_block->node;
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status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD,
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walk_info.gpe_device,
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ACPI_UINT32_MAX,
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ACPI_NS_WALK_NO_UNLOCK,
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acpi_ev_match_gpe_method,
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NULL, &walk_info, NULL);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"While decoding _Lxx/_Exx methods"));
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}
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gpe_block = gpe_block->next;
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}
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gpe_xrupt_info = gpe_xrupt_info->next;
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}
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if (walk_info.count) {
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ACPI_INFO((AE_INFO, "Enabled %u new GPEs", walk_info.count));
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}
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(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
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return;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_match_gpe_method
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*
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* PARAMETERS: Callback from walk_namespace
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*
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* RETURN: Status
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*
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* DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
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* control method under the _GPE portion of the namespace.
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* Extract the name and GPE type from the object, saving this
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* information for quick lookup during GPE dispatch. Allows a
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* per-owner_id evaluation if execute_by_owner_id is TRUE in the
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* walk_info parameter block.
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*
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* The name of each GPE control method is of the form:
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* "_Lxx" or "_Exx", where:
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* L - means that the GPE is level triggered
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* E - means that the GPE is edge triggered
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* xx - is the GPE number [in HEX]
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*
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* If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
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* with that owner.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_match_gpe_method(acpi_handle obj_handle,
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u32 level, void *context, void **return_value)
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{
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struct acpi_namespace_node *method_node =
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ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
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struct acpi_gpe_walk_info *walk_info =
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ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
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struct acpi_gpe_event_info *gpe_event_info;
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u32 gpe_number;
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char name[ACPI_NAME_SIZE + 1];
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u8 type;
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ACPI_FUNCTION_TRACE(ev_match_gpe_method);
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/* Check if requested owner_id matches this owner_id */
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if ((walk_info->execute_by_owner_id) &&
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(method_node->owner_id != walk_info->owner_id)) {
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* Match and decode the _Lxx and _Exx GPE method names
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*
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* 1) Extract the method name and null terminate it
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*/
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ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
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name[ACPI_NAME_SIZE] = 0;
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/* 2) Name must begin with an underscore */
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if (name[0] != '_') {
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return_ACPI_STATUS(AE_OK); /* Ignore this method */
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}
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/*
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* 3) Edge/Level determination is based on the 2nd character
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* of the method name
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*/
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switch (name[1]) {
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case 'L':
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type = ACPI_GPE_LEVEL_TRIGGERED;
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break;
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case 'E':
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type = ACPI_GPE_EDGE_TRIGGERED;
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break;
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default:
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/* Unknown method type, just ignore it */
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ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
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"Ignoring unknown GPE method type: %s "
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"(name not of form _Lxx or _Exx)", name));
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return_ACPI_STATUS(AE_OK);
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}
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/* 4) The last two characters of the name are the hex GPE Number */
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gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
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if (gpe_number == ACPI_UINT32_MAX) {
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/* Conversion failed; invalid method, just ignore it */
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ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
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"Could not extract GPE number from name: %s "
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"(name is not of form _Lxx or _Exx)", name));
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return_ACPI_STATUS(AE_OK);
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}
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/* Ensure that we have a valid GPE number for this GPE block */
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gpe_event_info =
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acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
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if (!gpe_event_info) {
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/*
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* This gpe_number is not valid for this GPE block, just ignore it.
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* However, it may be valid for a different GPE block, since GPE0
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* and GPE1 methods both appear under \_GPE.
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*/
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return_ACPI_STATUS(AE_OK);
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}
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if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
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ACPI_GPE_DISPATCH_HANDLER) {
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/* If there is already a handler, ignore this GPE method */
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return_ACPI_STATUS(AE_OK);
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}
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if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
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ACPI_GPE_DISPATCH_METHOD) {
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/*
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* If there is already a method, ignore this method. But check
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* for a type mismatch (if both the _Lxx AND _Exx exist)
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*/
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if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
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ACPI_ERROR((AE_INFO,
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"For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
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gpe_number, gpe_number, gpe_number));
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}
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return_ACPI_STATUS(AE_OK);
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}
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/* Disable the GPE in case it's been enabled already. */
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(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
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/*
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* Add the GPE information from above to the gpe_event_info block for
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* use during dispatch of this GPE.
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*/
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gpe_event_info->flags &= ~(ACPI_GPE_DISPATCH_MASK);
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gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
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gpe_event_info->dispatch.method_node = method_node;
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ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
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"Registered GPE method %s as GPE number 0x%.2X\n",
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name, gpe_number));
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return_ACPI_STATUS(AE_OK);
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}
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#endif /* !ACPI_REDUCED_HARDWARE */
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