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ACPI Debug Output | ||
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The ACPI CA, the Linux ACPI core, and some ACPI drivers can generate debug | ||
output. This document describes how to use this facility. | ||
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Compile-time configuration | ||
-------------------------- | ||
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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. | ||
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Boot- and run-time configuration | ||
-------------------------------- | ||
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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. | ||
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debug_layer (component) | ||
----------------------- | ||
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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. | ||
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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. | ||
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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: | ||
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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 | ||
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debug_level | ||
----------- | ||
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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. | ||
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The ACPI interpreter uses several different levels, but the Linux | ||
ACPI core and ACPI drivers generally only use ACPI_LV_INFO. | ||
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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. | ||
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The possible levels are defined in include/acpi/acoutput.h. Reading | ||
/sys/module/acpi/parameters/debug_level shows the supported mask values, | ||
currently these: | ||
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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 | ||
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Examples | ||
-------- | ||
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For example, drivers/acpi/bus.c contains this: | ||
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#define _COMPONENT ACPI_BUS_COMPONENT | ||
... | ||
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); | ||
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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.) | ||
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Enable all AML "Debug" output (stores to the Debug object while interpreting | ||
AML) during boot: | ||
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acpi.debug_layer=0xffffffff acpi.debug_level=0x2 | ||
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Enable PCI and PCI interrupt routing debug messages: | ||
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acpi.debug_layer=0x400000 acpi.debug_level=0x4 | ||
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Enable all ACPI hardware-related messages: | ||
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acpi.debug_layer=0x2 acpi.debug_level=0xffffffff | ||
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Enable all ACPI_DB_INFO messages after boot: | ||
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# echo 0x4 > /sys/module/acpi/parameters/debug_level | ||
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Show all valid component values: | ||
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# cat /sys/module/acpi/parameters/debug_layer |
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Original file line number | Diff line number | Diff line change |
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@@ -2185,6 +2185,13 @@ M: [email protected] | |
L: [email protected] (moderated for non-subscribers) | ||
S: Maintained | ||
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INTEL MENLOW THERMAL DRIVER | ||
P: Sujith Thomas | ||
M: [email protected] | ||
L: [email protected] | ||
W: http://www.lesswatts.org/projects/acpi/ | ||
S: Supported | ||
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INTEL IA32 MICROCODE UPDATE SUPPORT | ||
P: Tigran Aivazian | ||
M: [email protected] | ||
|
@@ -3346,7 +3353,9 @@ S: Maintained | |
|
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PNP SUPPORT | ||
P: Adam Belay | ||
M: [email protected] | ||
M: [email protected] | ||
P: Bjorn Helgaas | ||
M: [email protected] | ||
S: Maintained | ||
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PNXxxxx I2C DRIVER | ||
|
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