forked from luck/tmp_suning_uos_patched
Documentation: ACPI: move linuxized-acpica.txt to driver-api/acpi and convert to reST
This converts the plain text documentation to reStructuredText format and adds it to Sphinx TOC tree. No essential content change. Signed-off-by: Changbin Du <changbin.du@gmail.com> Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Changbin Du
Rafael J. Wysocki
parent
1cf70ae6f0
commit
25710e23cd
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@ -5,3 +5,4 @@ ACPI Support
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.. toctree::
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:maxdepth: 2
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linuxized-acpica
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@ -1,31 +1,37 @@
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.. SPDX-License-Identifier: GPL-2.0
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.. include:: <isonum.txt>
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============================================================
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Linuxized ACPICA - Introduction to ACPICA Release Automation
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============================================================
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Copyright (C) 2013-2016, Intel Corporation
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Author: Lv Zheng <lv.zheng@intel.com>
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:Copyright: |copy| 2013-2016, Intel Corporation
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:Author: Lv Zheng <lv.zheng@intel.com>
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Abstract:
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Abstract
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========
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This document describes the ACPICA project and the relationship between
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ACPICA and Linux. It also describes how ACPICA code in drivers/acpi/acpica,
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include/acpi and tools/power/acpi is automatically updated to follow the
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upstream.
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ACPICA Project
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==============
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1. ACPICA Project
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The ACPI Component Architecture (ACPICA) project provides an operating
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system (OS)-independent reference implementation of the Advanced
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Configuration and Power Interface Specification (ACPI). It has been
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adapted by various host OSes. By directly integrating ACPICA, Linux can
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also benefit from the application experiences of ACPICA from other host
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OSes.
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The ACPI Component Architecture (ACPICA) project provides an operating
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system (OS)-independent reference implementation of the Advanced
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Configuration and Power Interface Specification (ACPI). It has been
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adapted by various host OSes. By directly integrating ACPICA, Linux can
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also benefit from the application experiences of ACPICA from other host
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OSes.
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The homepage of ACPICA project is: www.acpica.org, it is maintained and
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supported by Intel Corporation.
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The homepage of ACPICA project is: www.acpica.org, it is maintained and
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supported by Intel Corporation.
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The following figure depicts the Linux ACPI subsystem where the ACPICA
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adaptation is included:
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The following figure depicts the Linux ACPI subsystem where the ACPICA
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adaptation is included::
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+---------------------------------------------------------+
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| |
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@ -71,21 +77,27 @@ upstream.
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Figure 1. Linux ACPI Software Components
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NOTE:
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.. note::
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A. OS Service Layer - Provided by Linux to offer OS dependent
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implementation of the predefined ACPICA interfaces (acpi_os_*).
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::
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include/acpi/acpiosxf.h
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drivers/acpi/osl.c
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include/acpi/platform
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include/asm/acenv.h
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B. ACPICA Functionality - Released from ACPICA code base to offer
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OS independent implementation of the ACPICA interfaces (acpi_*).
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::
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drivers/acpi/acpica
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include/acpi/ac*.h
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tools/power/acpi
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C. Linux/ACPI Functionality - Providing Linux specific ACPI
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functionality to the other Linux kernel subsystems and user space
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programs.
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::
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drivers/acpi
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include/linux/acpi.h
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include/linux/acpi*.h
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@ -95,24 +107,27 @@ upstream.
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ACPI subsystem to offer architecture specific implementation of the
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ACPI interfaces. They are Linux specific components and are out of
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the scope of this document.
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::
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include/asm/acpi.h
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include/asm/acpi*.h
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arch/*/acpi
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2. ACPICA Release
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ACPICA Release
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==============
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The ACPICA project maintains its code base at the following repository URL:
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https://github.com/acpica/acpica.git. As a rule, a release is made every
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month.
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The ACPICA project maintains its code base at the following repository URL:
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https://github.com/acpica/acpica.git. As a rule, a release is made every
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month.
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As the coding style adopted by the ACPICA project is not acceptable by
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Linux, there is a release process to convert the ACPICA git commits into
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Linux patches. The patches generated by this process are referred to as
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"linuxized ACPICA patches". The release process is carried out on a local
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copy the ACPICA git repository. Each commit in the monthly release is
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converted into a linuxized ACPICA patch. Together, they form the monthly
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ACPICA release patchset for the Linux ACPI community. This process is
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illustrated in the following figure:
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As the coding style adopted by the ACPICA project is not acceptable by
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Linux, there is a release process to convert the ACPICA git commits into
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Linux patches. The patches generated by this process are referred to as
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"linuxized ACPICA patches". The release process is carried out on a local
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copy the ACPICA git repository. Each commit in the monthly release is
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converted into a linuxized ACPICA patch. Together, they form the monthly
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ACPICA release patchset for the Linux ACPI community. This process is
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illustrated in the following figure::
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+-----------------------------+
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| acpica / master (-) commits |
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@ -153,7 +168,7 @@ upstream.
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Figure 2. ACPICA -> Linux Upstream Process
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NOTE:
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.. note::
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A. Linuxize Utilities - Provided by the ACPICA repository, including a
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utility located in source/tools/acpisrc folder and a number of
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scripts located in generate/linux folder.
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@ -170,19 +185,20 @@ upstream.
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following kernel configuration options:
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CONFIG_ACPI/CONFIG_ACPI_DEBUG/CONFIG_ACPI_DEBUGGER
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3. ACPICA Divergences
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ACPICA Divergences
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==================
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Ideally, all of the ACPICA commits should be converted into Linux patches
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automatically without manual modifications, the "linux / master" tree should
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contain the ACPICA code that exactly corresponds to the ACPICA code
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contained in "new linuxized acpica" tree and it should be possible to run
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the release process fully automatically.
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Ideally, all of the ACPICA commits should be converted into Linux patches
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automatically without manual modifications, the "linux / master" tree should
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contain the ACPICA code that exactly corresponds to the ACPICA code
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contained in "new linuxized acpica" tree and it should be possible to run
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the release process fully automatically.
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As a matter of fact, however, there are source code differences between
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the ACPICA code in Linux and the upstream ACPICA code, referred to as
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"ACPICA Divergences".
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As a matter of fact, however, there are source code differences between
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the ACPICA code in Linux and the upstream ACPICA code, referred to as
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"ACPICA Divergences".
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The various sources of ACPICA divergences include:
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The various sources of ACPICA divergences include:
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1. Legacy divergences - Before the current ACPICA release process was
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established, there already had been divergences between Linux and
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ACPICA. Over the past several years those divergences have been greatly
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@ -213,11 +229,12 @@ upstream.
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rebased on the ACPICA side in order to offer better solutions, new ACPICA
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divergences are generated.
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4. ACPICA Development
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ACPICA Development
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==================
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This paragraph guides Linux developers to use the ACPICA upstream release
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utilities to obtain Linux patches corresponding to upstream ACPICA commits
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before they become available from the ACPICA release process.
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This paragraph guides Linux developers to use the ACPICA upstream release
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utilities to obtain Linux patches corresponding to upstream ACPICA commits
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before they become available from the ACPICA release process.
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1. Cherry-pick an ACPICA commit
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@ -225,7 +242,7 @@ upstream.
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you want to cherry pick must be committed into the local repository.
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Then the gen-patch.sh command can help to cherry-pick an ACPICA commit
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from the ACPICA local repository:
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from the ACPICA local repository::
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$ git clone https://github.com/acpica/acpica
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$ cd acpica
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@ -240,7 +257,7 @@ upstream.
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changes that haven't been applied to Linux yet.
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You can generate the ACPICA release series yourself and rebase your code on
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top of the generated ACPICA release patches:
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top of the generated ACPICA release patches::
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$ git clone https://github.com/acpica/acpica
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$ cd acpica
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@ -254,7 +271,7 @@ upstream.
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3. Inspect the current divergences
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If you have local copies of both Linux and upstream ACPICA, you can generate
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a diff file indicating the state of the current divergences:
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a diff file indicating the state of the current divergences::
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# git clone https://github.com/acpica/acpica
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# git clone http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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