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Subject[PATCH v4 16/63] Documentation: ACPI: move debug.txt to firmware-guide/acpi and convert to reST
This converts the plain text documentation to reStructuredText format and
add it to Sphinx TOC tree. No essential content change.

Signed-off-by: Changbin Du <>
.../acpi/debug.rst} | 31 ++++++++++---------
Documentation/firmware-guide/acpi/index.rst | 3 +-
2 files changed, 19 insertions(+), 15 deletions(-)
rename Documentation/{acpi/debug.txt => firmware-guide/acpi/debug.rst} (91%)

diff --git a/Documentation/acpi/debug.txt b/Documentation/firmware-guide/acpi/debug.rst
similarity index 91%
rename from Documentation/acpi/debug.txt
rename to Documentation/firmware-guide/acpi/debug.rst
index 65bf47c46b6d..1a152dd1d765 100644
--- a/Documentation/acpi/debug.txt
+++ b/Documentation/firmware-guide/acpi/debug.rst
@@ -1,18 +1,21 @@
- ACPI Debug Output
+.. 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

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
@@ -21,7 +24,7 @@ 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
@@ -33,7 +36,7 @@ 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:
+shows the supported mask values, currently these::

ACPI_HARDWARE 0x00000002
@@ -65,7 +68,7 @@ shows the supported mask values, currently these:


The "debug_level" is a mask that selects different types of messages, e.g.,
those related to initialization, method execution, informational messages, etc.
@@ -81,7 +84,7 @@ 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:
+currently these::

ACPI_LV_INIT 0x00000001
@@ -113,9 +116,9 @@ currently these:
ACPI_LV_EVENTS 0x80000000


-For example, drivers/acpi/bus.c contains this:
+For example, drivers/acpi/bus.c contains this::

@@ -127,22 +130,22 @@ statement uses ACPI_DB_INFO, which is macro based on the ACPI_LV_INFO

Enable all AML "Debug" output (stores to the Debug object while interpreting
-AML) during boot:
+AML) during boot::

acpi.debug_layer=0xffffffff acpi.debug_level=0x2

-Enable PCI and PCI interrupt routing debug messages:
+Enable PCI and PCI interrupt routing debug messages::

acpi.debug_layer=0x400000 acpi.debug_level=0x4

-Enable all ACPI hardware-related messages:
+Enable all ACPI hardware-related messages::

acpi.debug_layer=0x2 acpi.debug_level=0xffffffff

-Enable all ACPI_DB_INFO messages after boot:
+Enable all ACPI_DB_INFO messages after boot::

# echo 0x4 > /sys/module/acpi/parameters/debug_level

-Show all valid component values:
+Show all valid component values::

# cat /sys/module/acpi/parameters/debug_layer
diff --git a/Documentation/firmware-guide/acpi/index.rst b/Documentation/firmware-guide/acpi/index.rst
index 6d4e0df4f063..a45fea11f998 100644
--- a/Documentation/firmware-guide/acpi/index.rst
+++ b/Documentation/firmware-guide/acpi/index.rst
@@ -14,6 +14,7 @@ ACPI Support
+ debug
- acpi-lid
\ No newline at end of file
+ acpi-lid
 \ /
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