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authorLv Zheng <lv.zheng@intel.com>2016-07-07 10:10:45 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-07-09 00:11:39 +0300
commit1461d8a5a0e4dad98a38a0932950293692e555d3 (patch)
treec11177b3a1c2ba353a82171fad955f861631692f
parent9305aa6fe9069970e5cb8428ca4817b4aeaee271 (diff)
downloadlinux-1461d8a5a0e4dad98a38a0932950293692e555d3.tar.xz
ACPI / debugger: Add AML debugger documentation
This patch documents the AML debugger. Signed-off-by: Lv Zheng <lv.zheng@intel.com> [ rjw: Editorial changes ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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+The AML Debugger
+
+Copyright (C) 2016, Intel Corporation
+Author: Lv Zheng <lv.zheng@intel.com>
+
+
+This document describes the usage of the AML debugger embedded in the Linux
+kernel.
+
+1. Build the debugger
+
+ The following kernel configuration items are required to enable the AML
+ debugger interface from the Linux kernel:
+
+ CONFIG_ACPI_DEBUGGER=y
+ CONFIG_ACPI_DEBUGGER_USER=m
+
+ The userspace utlities can be built from the kernel source tree using
+ the following commands:
+
+ $ cd tools
+ $ make acpi
+
+ The resultant userspace tool binary is then located at:
+
+ tools/acpi/power/acpi/acpidbg/acpidbg
+
+ It can be installed to system directories by running "make install" (as a
+ sufficiently privileged user).
+
+2. Start the userspace debugger interface
+
+ After booting the kernel with the debugger built-in, the debugger can be
+ started by using the following commands:
+
+ # mount -t debugfs none /sys/kernel/debug
+ # modprobe acpi_dbg
+ # tools/acpi/power/acpi/acpidbg/acpidbg
+
+ That spawns the interactive AML debugger environment where you can execute
+ debugger commands.
+
+ The commands are documented in the "ACPICA Overview and Programmer Reference"
+ that can be downloaded from
+
+ https://acpica.org/documentation
+
+ The detailed debugger commands reference is located in Chapter 12 "ACPICA
+ Debugger Reference". The "help" command can be used for a quick reference.
+
+3. Stop the userspace debugger interface
+
+ The interactive debugger interface can be closed by pressing Ctrl+C or using
+ the "quit" or "exit" commands. When finished, unload the module with:
+
+ # rmmod acpi_dbg
+
+ The module unloading may fail if there is an acpidbg instance running.
+
+4. Run the debugger in a script
+
+ It may be useful to run the AML debugger in a test script. "acpidbg" supports
+ this in a special "batch" mode. For example, the following command outputs
+ the entire ACPI namespace:
+
+ # acpidbg -b "namespace"