+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+============================================================
Linuxized ACPICA - Introduction to ACPICA Release Automation
+============================================================
-Copyright (C) 2013-2016, Intel Corporation
-Author: Lv Zheng <lv.zheng@intel.com>
+:Copyright: |copy| 2013-2016, Intel Corporation
+:Author: Lv Zheng <lv.zheng@intel.com>
-Abstract:
+Abstract
+========
This document describes the ACPICA project and the relationship between
ACPICA and Linux. It also describes how ACPICA code in drivers/acpi/acpica,
include/acpi and tools/power/acpi is automatically updated to follow the
upstream.
+ACPICA Project
+==============
-1. ACPICA Project
-
- The ACPI Component Architecture (ACPICA) project provides an operating
- system (OS)-independent reference implementation of the Advanced
- Configuration and Power Interface Specification (ACPI). It has been
- adapted by various host OSes. By directly integrating ACPICA, Linux can
- also benefit from the application experiences of ACPICA from other host
- OSes.
+The ACPI Component Architecture (ACPICA) project provides an operating
+system (OS)-independent reference implementation of the Advanced
+Configuration and Power Interface Specification (ACPI). It has been
+adapted by various host OSes. By directly integrating ACPICA, Linux can
+also benefit from the application experiences of ACPICA from other host
+OSes.
- The homepage of ACPICA project is: www.acpica.org, it is maintained and
- supported by Intel Corporation.
+The homepage of ACPICA project is: www.acpica.org, it is maintained and
+supported by Intel Corporation.
- The following figure depicts the Linux ACPI subsystem where the ACPICA
- adaptation is included:
+The following figure depicts the Linux ACPI subsystem where the ACPICA
+adaptation is included::
+---------------------------------------------------------+
| |
Figure 1. Linux ACPI Software Components
- NOTE:
+.. note::
A. OS Service Layer - Provided by Linux to offer OS dependent
implementation of the predefined ACPICA interfaces (acpi_os_*).
+ ::
+
include/acpi/acpiosxf.h
drivers/acpi/osl.c
include/acpi/platform
include/asm/acenv.h
B. ACPICA Functionality - Released from ACPICA code base to offer
OS independent implementation of the ACPICA interfaces (acpi_*).
+ ::
+
drivers/acpi/acpica
include/acpi/ac*.h
tools/power/acpi
C. Linux/ACPI Functionality - Providing Linux specific ACPI
functionality to the other Linux kernel subsystems and user space
programs.
+ ::
+
drivers/acpi
include/linux/acpi.h
include/linux/acpi*.h
ACPI subsystem to offer architecture specific implementation of the
ACPI interfaces. They are Linux specific components and are out of
the scope of this document.
+ ::
+
include/asm/acpi.h
include/asm/acpi*.h
arch/*/acpi
-2. ACPICA Release
+ACPICA Release
+==============
- The ACPICA project maintains its code base at the following repository URL:
- https://github.com/acpica/acpica.git. As a rule, a release is made every
- month.
+The ACPICA project maintains its code base at the following repository URL:
+https://github.com/acpica/acpica.git. As a rule, a release is made every
+month.
- As the coding style adopted by the ACPICA project is not acceptable by
- Linux, there is a release process to convert the ACPICA git commits into
- Linux patches. The patches generated by this process are referred to as
- "linuxized ACPICA patches". The release process is carried out on a local
- copy the ACPICA git repository. Each commit in the monthly release is
- converted into a linuxized ACPICA patch. Together, they form the monthly
- ACPICA release patchset for the Linux ACPI community. This process is
- illustrated in the following figure:
+As the coding style adopted by the ACPICA project is not acceptable by
+Linux, there is a release process to convert the ACPICA git commits into
+Linux patches. The patches generated by this process are referred to as
+"linuxized ACPICA patches". The release process is carried out on a local
+copy the ACPICA git repository. Each commit in the monthly release is
+converted into a linuxized ACPICA patch. Together, they form the monthly
+ACPICA release patchset for the Linux ACPI community. This process is
+illustrated in the following figure::
+-----------------------------+
| acpica / master (-) commits |
Figure 2. ACPICA -> Linux Upstream Process
- NOTE:
+.. note::
A. Linuxize Utilities - Provided by the ACPICA repository, including a
utility located in source/tools/acpisrc folder and a number of
scripts located in generate/linux folder.
following kernel configuration options:
CONFIG_ACPI/CONFIG_ACPI_DEBUG/CONFIG_ACPI_DEBUGGER
-3. ACPICA Divergences
+ACPICA Divergences
+==================
- Ideally, all of the ACPICA commits should be converted into Linux patches
- automatically without manual modifications, the "linux / master" tree should
- contain the ACPICA code that exactly corresponds to the ACPICA code
- contained in "new linuxized acpica" tree and it should be possible to run
- the release process fully automatically.
+Ideally, all of the ACPICA commits should be converted into Linux patches
+automatically without manual modifications, the "linux / master" tree should
+contain the ACPICA code that exactly corresponds to the ACPICA code
+contained in "new linuxized acpica" tree and it should be possible to run
+the release process fully automatically.
- As a matter of fact, however, there are source code differences between
- the ACPICA code in Linux and the upstream ACPICA code, referred to as
- "ACPICA Divergences".
+As a matter of fact, however, there are source code differences between
+the ACPICA code in Linux and the upstream ACPICA code, referred to as
+"ACPICA Divergences".
- The various sources of ACPICA divergences include:
+The various sources of ACPICA divergences include:
1. Legacy divergences - Before the current ACPICA release process was
established, there already had been divergences between Linux and
ACPICA. Over the past several years those divergences have been greatly
rebased on the ACPICA side in order to offer better solutions, new ACPICA
divergences are generated.
-4. ACPICA Development
+ACPICA Development
+==================
- This paragraph guides Linux developers to use the ACPICA upstream release
- utilities to obtain Linux patches corresponding to upstream ACPICA commits
- before they become available from the ACPICA release process.
+This paragraph guides Linux developers to use the ACPICA upstream release
+utilities to obtain Linux patches corresponding to upstream ACPICA commits
+before they become available from the ACPICA release process.
1. Cherry-pick an ACPICA commit
you want to cherry pick must be committed into the local repository.
Then the gen-patch.sh command can help to cherry-pick an ACPICA commit
- from the ACPICA local repository:
+ from the ACPICA local repository::
$ git clone https://github.com/acpica/acpica
$ cd acpica
changes that haven't been applied to Linux yet.
You can generate the ACPICA release series yourself and rebase your code on
- top of the generated ACPICA release patches:
+ top of the generated ACPICA release patches::
$ git clone https://github.com/acpica/acpica
$ cd acpica
3. Inspect the current divergences
If you have local copies of both Linux and upstream ACPICA, you can generate
- a diff file indicating the state of the current divergences:
+ a diff file indicating the state of the current divergences::
# git clone https://github.com/acpica/acpica
# git clone http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git