diff options
| -rw-r--r-- | Documentation/firmware-guide/acpi/debug.rst (renamed from Documentation/acpi/debug.txt) | 31 | ||||
| -rw-r--r-- | Documentation/firmware-guide/acpi/index.rst | 3 |
2 files changed, 19 insertions, 15 deletions
diff --git a/Documentation/acpi/debug.txt b/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 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 @@ -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_UTILITIES 0x00000001 ACPI_HARDWARE 0x00000002 @@ -65,7 +68,7 @@ shows the supported mask values, currently these: 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. @@ -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 ACPI_LV_DEBUG_OBJECT 0x00000002 @@ -113,9 +116,9 @@ currently these: ACPI_LV_EVENTS 0x80000000 Examples --------- +======== -For example, drivers/acpi/bus.c contains this: +For example, drivers/acpi/bus.c contains this:: #define _COMPONENT ACPI_BUS_COMPONENT ... @@ -127,22 +130,22 @@ 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: +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 osi method-customizing DSD-properties-rules + debug gpio-properties i2c-muxes - acpi-lid
\ No newline at end of file + acpi-lid |