mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-14 06:35:12 +00:00
3aadd86e56
Drop the definitions of the following symbols: ACPI_SBS_COMPONENT ACPI_FAN_COMPONENT ACPI_CONTAINER_COMPONENT ACPI_MEMORY_DEVICE_COMPONENT that are not used in a meaningful way any more and update the ACPI debug documentation to avoid confusing users by making the impression that the ACPICA debug can be used for anything other than ACPICA itself, which is incorrect. No functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
132 lines
4.8 KiB
ReStructuredText
132 lines
4.8 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
====================
|
|
ACPI CA Debug Output
|
|
====================
|
|
|
|
The ACPI CA can generate debug output. This document describes how to use this
|
|
facility.
|
|
|
|
Compile-time configuration
|
|
==========================
|
|
|
|
The ACPI CA debug output is globally enabled by CONFIG_ACPI_DEBUG. If this
|
|
config option is not set, 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 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.
|
|
|
|
Reading /sys/module/acpi/parameters/debug_layer shows the supported mask values::
|
|
|
|
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
|
|
|
|
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/acpica/evxfevnt.c contains this::
|
|
|
|
#define _COMPONENT ACPI_EVENTS
|
|
...
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
|
|
|
|
To turn on this message, set the ACPI_EVENTS bit in acpi.debug_layer
|
|
and the ACPI_LV_INIT bit in acpi.debug_level. (The ACPI_DEBUG_PRINT
|
|
statement uses ACPI_DB_INIT, which is a macro based on the ACPI_LV_INIT
|
|
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 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
|