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423 lines
12 KiB
423 lines
12 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/****************************************************************************** |
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* |
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* Module Name: evgpeinit - System GPE initialization and update |
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* |
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* Copyright (C) 2000 - 2021, Intel Corp. |
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* |
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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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#ifdef ACPI_GPE_USE_LOGICAL_ADDRESSES |
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#define ACPI_FADT_GPE_BLOCK_ADDRESS(N) \ |
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acpi_gbl_FADT.xgpe##N##_block.space_id == \ |
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ACPI_ADR_SPACE_SYSTEM_MEMORY ? \ |
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(u64)acpi_gbl_xgpe##N##_block_logical_address : \ |
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acpi_gbl_FADT.xgpe##N##_block.address |
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#else |
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#define ACPI_FADT_GPE_BLOCK_ADDRESS(N) acpi_gbl_FADT.xgpe##N##_block.address |
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#endif /* ACPI_GPE_USE_LOGICAL_ADDRESSES */ |
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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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u64 address; |
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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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address = ACPI_FADT_GPE_BLOCK_ADDRESS(0); |
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if (acpi_gbl_FADT.gpe0_block_length && 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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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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address = ACPI_FADT_GPE_BLOCK_ADDRESS(1); |
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if (acpi_gbl_FADT.gpe1_block_length && 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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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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} |
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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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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(("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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acpi_status status; |
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u32 gpe_number; |
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u8 temp_gpe_number; |
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char name[ACPI_NAMESEG_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_NAMESEG_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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status = acpi_ut_ascii_to_hex_byte(&name[2], &temp_gpe_number); |
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if (ACPI_FAILURE(status)) { |
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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_number = (u32)temp_gpe_number; |
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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 ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == |
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ACPI_GPE_DISPATCH_HANDLER) || |
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(ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == |
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ACPI_GPE_DISPATCH_RAW_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 (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == |
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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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