mirror of https://gitee.com/openkylin/linux.git
152 lines
5.7 KiB
ReStructuredText
152 lines
5.7 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
=================
|
|
ACPI Debug Output
|
|
=================
|
|
|
|
The ACPI CA, the Linux ACPI core, and some ACPI drivers can generate debug
|
|
output. This document describes how to use this facility.
|
|
|
|
Compile-time configuration
|
|
==========================
|
|
|
|
ACPI debug output is globally enabled by CONFIG_ACPI_DEBUG. If this config
|
|
option is turned off, the debug messages are not even built into the
|
|
kernel.
|
|
|
|
Boot- and run-time configuration
|
|
================================
|
|
|
|
When CONFIG_ACPI_DEBUG=y, you can select the component and level of messages
|
|
you're interested in. At boot-time, use the acpi.debug_layer and
|
|
acpi.debug_level kernel command line options. After boot, you can use the
|
|
debug_layer and debug_level files in /sys/module/acpi/parameters/ to control
|
|
the debug messages.
|
|
|
|
debug_layer (component)
|
|
=======================
|
|
|
|
The "debug_layer" is a mask that selects components of interest, e.g., a
|
|
specific driver or part of the ACPI interpreter. To build the debug_layer
|
|
bitmask, look for the "#define _COMPONENT" in an ACPI source file.
|
|
|
|
You can set the debug_layer mask at boot-time using the acpi.debug_layer
|
|
command line argument, and you can change it after boot by writing values
|
|
to /sys/module/acpi/parameters/debug_layer.
|
|
|
|
The possible components are defined in include/acpi/acoutput.h and
|
|
include/acpi/acpi_drivers.h. Reading /sys/module/acpi/parameters/debug_layer
|
|
shows the supported mask values, currently these::
|
|
|
|
ACPI_UTILITIES 0x00000001
|
|
ACPI_HARDWARE 0x00000002
|
|
ACPI_EVENTS 0x00000004
|
|
ACPI_TABLES 0x00000008
|
|
ACPI_NAMESPACE 0x00000010
|
|
ACPI_PARSER 0x00000020
|
|
ACPI_DISPATCHER 0x00000040
|
|
ACPI_EXECUTER 0x00000080
|
|
ACPI_RESOURCES 0x00000100
|
|
ACPI_CA_DEBUGGER 0x00000200
|
|
ACPI_OS_SERVICES 0x00000400
|
|
ACPI_CA_DISASSEMBLER 0x00000800
|
|
ACPI_COMPILER 0x00001000
|
|
ACPI_TOOLS 0x00002000
|
|
ACPI_BUS_COMPONENT 0x00010000
|
|
ACPI_AC_COMPONENT 0x00020000
|
|
ACPI_BATTERY_COMPONENT 0x00040000
|
|
ACPI_BUTTON_COMPONENT 0x00080000
|
|
ACPI_SBS_COMPONENT 0x00100000
|
|
ACPI_FAN_COMPONENT 0x00200000
|
|
ACPI_PCI_COMPONENT 0x00400000
|
|
ACPI_POWER_COMPONENT 0x00800000
|
|
ACPI_CONTAINER_COMPONENT 0x01000000
|
|
ACPI_SYSTEM_COMPONENT 0x02000000
|
|
ACPI_THERMAL_COMPONENT 0x04000000
|
|
ACPI_MEMORY_DEVICE_COMPONENT 0x08000000
|
|
ACPI_VIDEO_COMPONENT 0x10000000
|
|
ACPI_PROCESSOR_COMPONENT 0x20000000
|
|
|
|
debug_level
|
|
===========
|
|
|
|
The "debug_level" is a mask that selects different types of messages, e.g.,
|
|
those related to initialization, method execution, informational messages, etc.
|
|
To build debug_level, look at the level specified in an ACPI_DEBUG_PRINT()
|
|
statement.
|
|
|
|
The ACPI interpreter uses several different levels, but the Linux
|
|
ACPI core and ACPI drivers generally only use ACPI_LV_INFO.
|
|
|
|
You can set the debug_level mask at boot-time using the acpi.debug_level
|
|
command line argument, and you can change it after boot by writing values
|
|
to /sys/module/acpi/parameters/debug_level.
|
|
|
|
The possible levels are defined in include/acpi/acoutput.h. Reading
|
|
/sys/module/acpi/parameters/debug_level shows the supported mask values,
|
|
currently these::
|
|
|
|
ACPI_LV_INIT 0x00000001
|
|
ACPI_LV_DEBUG_OBJECT 0x00000002
|
|
ACPI_LV_INFO 0x00000004
|
|
ACPI_LV_INIT_NAMES 0x00000020
|
|
ACPI_LV_PARSE 0x00000040
|
|
ACPI_LV_LOAD 0x00000080
|
|
ACPI_LV_DISPATCH 0x00000100
|
|
ACPI_LV_EXEC 0x00000200
|
|
ACPI_LV_NAMES 0x00000400
|
|
ACPI_LV_OPREGION 0x00000800
|
|
ACPI_LV_BFIELD 0x00001000
|
|
ACPI_LV_TABLES 0x00002000
|
|
ACPI_LV_VALUES 0x00004000
|
|
ACPI_LV_OBJECTS 0x00008000
|
|
ACPI_LV_RESOURCES 0x00010000
|
|
ACPI_LV_USER_REQUESTS 0x00020000
|
|
ACPI_LV_PACKAGE 0x00040000
|
|
ACPI_LV_ALLOCATIONS 0x00100000
|
|
ACPI_LV_FUNCTIONS 0x00200000
|
|
ACPI_LV_OPTIMIZATIONS 0x00400000
|
|
ACPI_LV_MUTEX 0x01000000
|
|
ACPI_LV_THREADS 0x02000000
|
|
ACPI_LV_IO 0x04000000
|
|
ACPI_LV_INTERRUPTS 0x08000000
|
|
ACPI_LV_AML_DISASSEMBLE 0x10000000
|
|
ACPI_LV_VERBOSE_INFO 0x20000000
|
|
ACPI_LV_FULL_TABLES 0x40000000
|
|
ACPI_LV_EVENTS 0x80000000
|
|
|
|
Examples
|
|
========
|
|
|
|
For example, drivers/acpi/bus.c contains this::
|
|
|
|
#define _COMPONENT ACPI_BUS_COMPONENT
|
|
...
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
|
|
|
|
To turn on this message, set the ACPI_BUS_COMPONENT bit in acpi.debug_layer
|
|
and the ACPI_LV_INFO bit in acpi.debug_level. (The ACPI_DEBUG_PRINT
|
|
statement uses ACPI_DB_INFO, which is macro based on the ACPI_LV_INFO
|
|
definition.)
|
|
|
|
Enable all AML "Debug" output (stores to the Debug object while interpreting
|
|
AML) during boot::
|
|
|
|
acpi.debug_layer=0xffffffff acpi.debug_level=0x2
|
|
|
|
Enable PCI and PCI interrupt routing debug messages::
|
|
|
|
acpi.debug_layer=0x400000 acpi.debug_level=0x4
|
|
|
|
Enable all ACPI hardware-related messages::
|
|
|
|
acpi.debug_layer=0x2 acpi.debug_level=0xffffffff
|
|
|
|
Enable all ACPI_DB_INFO messages after boot::
|
|
|
|
# echo 0x4 > /sys/module/acpi/parameters/debug_level
|
|
|
|
Show all valid component values::
|
|
|
|
# cat /sys/module/acpi/parameters/debug_layer
|