2019-04-25 01:52:47 +08:00
|
|
|
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
|
.. include:: <isonum.txt>
|
|
|
|
|
|
|
|
|
|
============================================================
|
2016-07-07 15:10:36 +08:00
|
|
|
Linuxized ACPICA - Introduction to ACPICA Release Automation
|
2019-04-25 01:52:47 +08:00
|
|
|
============================================================
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
:Copyright: |copy| 2013-2016, Intel Corporation
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
:Author: Lv Zheng <lv.zheng@intel.com>
|
2016-07-07 15:10:36 +08:00
|
|
|
|
|
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
Abstract
|
|
|
|
|
========
|
2016-07-07 15:10:36 +08:00
|
|
|
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.
|
|
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
ACPICA Project
|
|
|
|
|
==============
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
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.
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
The homepage of ACPICA project is: www.acpica.org, it is maintained and
|
|
|
|
|
supported by Intel Corporation.
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
The following figure depicts the Linux ACPI subsystem where the ACPICA
|
|
|
|
|
adaptation is included::
|
2016-07-07 15:10:36 +08:00
|
|
|
|
|
|
|
|
+---------------------------------------------------------+
|
|
|
|
|
| |
|
|
|
|
|
| +---------------------------------------------------+ |
|
|
|
|
|
| | +------------------+ | |
|
|
|
|
|
| | | Table Management | | |
|
|
|
|
|
| | +------------------+ | |
|
|
|
|
|
| | +----------------------+ | |
|
|
|
|
|
| | | Namespace Management | | |
|
|
|
|
|
| | +----------------------+ | |
|
|
|
|
|
| | +------------------+ ACPICA Components | |
|
|
|
|
|
| | | Event Management | | |
|
|
|
|
|
| | +------------------+ | |
|
|
|
|
|
| | +---------------------+ | |
|
|
|
|
|
| | | Resource Management | | |
|
|
|
|
|
| | +---------------------+ | |
|
|
|
|
|
| | +---------------------+ | |
|
|
|
|
|
| | | Hardware Management | | |
|
|
|
|
|
| | +---------------------+ | |
|
|
|
|
|
| +---------------------------------------------------+ | |
|
|
|
|
|
| | | +------------------+ | | |
|
|
|
|
|
| | | | OS Service Layer | | | |
|
|
|
|
|
| | | +------------------+ | | |
|
|
|
|
|
| | +-------------------------------------------------|-+ |
|
|
|
|
|
| | +--------------------+ | |
|
|
|
|
|
| | | Device Enumeration | | |
|
|
|
|
|
| | +--------------------+ | |
|
|
|
|
|
| | +------------------+ | |
|
|
|
|
|
| | | Power Management | | |
|
|
|
|
|
| | +------------------+ Linux/ACPI Components | |
|
|
|
|
|
| | +--------------------+ | |
|
|
|
|
|
| | | Thermal Management | | |
|
|
|
|
|
| | +--------------------+ | |
|
|
|
|
|
| | +--------------------------+ | |
|
|
|
|
|
| | | Drivers for ACPI Devices | | |
|
|
|
|
|
| | +--------------------------+ | |
|
|
|
|
|
| | +--------+ | |
|
|
|
|
|
| | | ...... | | |
|
|
|
|
|
| | +--------+ | |
|
|
|
|
|
| +---------------------------------------------------+ |
|
|
|
|
|
| |
|
|
|
|
|
+---------------------------------------------------------+
|
|
|
|
|
|
|
|
|
|
Figure 1. Linux ACPI Software Components
|
|
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
.. note::
|
2016-07-07 15:10:36 +08:00
|
|
|
A. OS Service Layer - Provided by Linux to offer OS dependent
|
|
|
|
|
implementation of the predefined ACPICA interfaces (acpi_os_*).
|
2019-04-25 01:52:47 +08:00
|
|
|
::
|
|
|
|
|
|
2016-07-07 15:10:36 +08:00
|
|
|
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_*).
|
2019-04-25 01:52:47 +08:00
|
|
|
::
|
|
|
|
|
|
2016-07-07 15:10:36 +08:00
|
|
|
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.
|
2019-04-25 01:52:47 +08:00
|
|
|
::
|
|
|
|
|
|
2016-07-07 15:10:36 +08:00
|
|
|
drivers/acpi
|
|
|
|
|
include/linux/acpi.h
|
|
|
|
|
include/linux/acpi*.h
|
|
|
|
|
include/acpi
|
|
|
|
|
tools/power/acpi
|
|
|
|
|
D. Architecture Specific ACPICA/ACPI Functionalities - Provided by the
|
|
|
|
|
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.
|
2019-04-25 01:52:47 +08:00
|
|
|
::
|
|
|
|
|
|
2016-07-07 15:10:36 +08:00
|
|
|
include/asm/acpi.h
|
|
|
|
|
include/asm/acpi*.h
|
|
|
|
|
arch/*/acpi
|
|
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
ACPICA Release
|
|
|
|
|
==============
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
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.
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
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::
|
2016-07-07 15:10:36 +08:00
|
|
|
|
|
|
|
|
+-----------------------------+
|
|
|
|
|
| acpica / master (-) commits |
|
|
|
|
|
+-----------------------------+
|
|
|
|
|
/|\ |
|
|
|
|
|
| \|/
|
|
|
|
|
| /---------------------\ +----------------------+
|
|
|
|
|
| < Linuxize repo Utility >-->| old linuxized acpica |--+
|
|
|
|
|
| \---------------------/ +----------------------+ |
|
|
|
|
|
| |
|
|
|
|
|
/---------\ |
|
|
|
|
|
< git reset > \
|
|
|
|
|
\---------/ \
|
|
|
|
|
/|\ /+-+
|
|
|
|
|
| / |
|
|
|
|
|
+-----------------------------+ | |
|
|
|
|
|
| acpica / master (+) commits | | |
|
|
|
|
|
+-----------------------------+ | |
|
|
|
|
|
| | |
|
|
|
|
|
\|/ | |
|
|
|
|
|
/-----------------------\ +----------------------+ | |
|
|
|
|
|
< Linuxize repo Utilities >-->| new linuxized acpica |--+ |
|
|
|
|
|
\-----------------------/ +----------------------+ |
|
|
|
|
|
\|/
|
|
|
|
|
+--------------------------+ /----------------------\
|
|
|
|
|
| Linuxized ACPICA Patches |<----------------< Linuxize patch Utility >
|
|
|
|
|
+--------------------------+ \----------------------/
|
|
|
|
|
|
|
|
|
|
|
\|/
|
|
|
|
|
/---------------------------\
|
|
|
|
|
< Linux ACPI Community Review >
|
|
|
|
|
\---------------------------/
|
|
|
|
|
|
|
|
|
|
|
\|/
|
|
|
|
|
+-----------------------+ /------------------\ +----------------+
|
|
|
|
|
| linux-pm / linux-next |-->< Linux Merge Window >-->| linux / master |
|
|
|
|
|
+-----------------------+ \------------------/ +----------------+
|
|
|
|
|
|
|
|
|
|
Figure 2. ACPICA -> Linux Upstream Process
|
|
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
.. note::
|
2016-07-07 15:10:36 +08:00
|
|
|
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.
|
|
|
|
|
B. acpica / master - "master" branch of the git repository at
|
|
|
|
|
<https://github.com/acpica/acpica.git>.
|
|
|
|
|
C. linux-pm / linux-next - "linux-next" branch of the git repository at
|
|
|
|
|
<http://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git>.
|
|
|
|
|
D. linux / master - "master" branch of the git repository at
|
|
|
|
|
<http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git>.
|
|
|
|
|
|
|
|
|
|
Before the linuxized ACPICA patches are sent to the Linux ACPI community
|
2017-04-19 10:07:56 +08:00
|
|
|
for review, there is a quality assurance build test process to reduce
|
2016-07-07 15:10:36 +08:00
|
|
|
porting issues. Currently this build process only takes care of the
|
|
|
|
|
following kernel configuration options:
|
|
|
|
|
CONFIG_ACPI/CONFIG_ACPI_DEBUG/CONFIG_ACPI_DEBUGGER
|
|
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
ACPICA Divergences
|
|
|
|
|
==================
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
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.
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
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".
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
The various sources of ACPICA divergences include:
|
2016-07-07 15:10:36 +08:00
|
|
|
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
|
|
|
|
|
reduced, but there still are several ones and it takes time to figure
|
|
|
|
|
out the underlying reasons for their existence.
|
|
|
|
|
2. Manual modifications - Any manual modification (eg. coding style fixes)
|
|
|
|
|
made directly in the Linux sources obviously hurts the ACPICA release
|
|
|
|
|
automation. Thus it is recommended to fix such issues in the ACPICA
|
|
|
|
|
upstream source code and generate the linuxized fix using the ACPICA
|
|
|
|
|
release utilities (please refer to Section 4 below for the details).
|
|
|
|
|
3. Linux specific features - Sometimes it's impossible to use the
|
|
|
|
|
current ACPICA APIs to implement features required by the Linux kernel,
|
2017-04-19 10:07:56 +08:00
|
|
|
so Linux developers occasionally have to change ACPICA code directly.
|
2016-07-07 15:10:36 +08:00
|
|
|
Those changes may not be acceptable by ACPICA upstream and in such cases
|
|
|
|
|
they are left as committed ACPICA divergences unless the ACPICA side can
|
|
|
|
|
implement new mechanisms as replacements for them.
|
|
|
|
|
4. ACPICA release fixups - ACPICA only tests commits using a set of the
|
2017-04-19 10:07:56 +08:00
|
|
|
user space simulation utilities, thus the linuxized ACPICA patches may
|
2016-07-07 15:10:36 +08:00
|
|
|
break the Linux kernel, leaving us build/boot failures. In order to
|
|
|
|
|
avoid breaking Linux bisection, fixes are applied directly to the
|
|
|
|
|
linuxized ACPICA patches during the release process. When the release
|
|
|
|
|
fixups are backported to the upstream ACPICA sources, they must follow
|
|
|
|
|
the upstream ACPICA rules and so further modifications may appear.
|
|
|
|
|
That may result in the appearance of new divergences.
|
|
|
|
|
5. Fast tracking of ACPICA commits - Some ACPICA commits are regression
|
|
|
|
|
fixes or stable-candidate material, so they are applied in advance with
|
|
|
|
|
respect to the ACPICA release process. If such commits are reverted or
|
|
|
|
|
rebased on the ACPICA side in order to offer better solutions, new ACPICA
|
|
|
|
|
divergences are generated.
|
|
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
ACPICA Development
|
|
|
|
|
==================
|
2016-07-07 15:10:36 +08:00
|
|
|
|
2019-04-25 01:52:47 +08:00
|
|
|
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.
|
2016-07-07 15:10:36 +08:00
|
|
|
|
|
|
|
|
1. Cherry-pick an ACPICA commit
|
|
|
|
|
|
|
|
|
|
First you need to git clone the ACPICA repository and the ACPICA change
|
|
|
|
|
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
|
2019-04-25 01:52:47 +08:00
|
|
|
from the ACPICA local repository::
|
2016-07-07 15:10:36 +08:00
|
|
|
|
|
|
|
|
$ git clone https://github.com/acpica/acpica
|
|
|
|
|
$ cd acpica
|
|
|
|
|
$ generate/linux/gen-patch.sh -u [commit ID]
|
|
|
|
|
|
|
|
|
|
Here the commit ID is the ACPICA local repository commit ID you want to
|
|
|
|
|
cherry pick. It can be omitted if the commit is "HEAD".
|
|
|
|
|
|
|
|
|
|
2. Cherry-pick recent ACPICA commits
|
|
|
|
|
|
|
|
|
|
Sometimes you need to rebase your code on top of the most recent ACPICA
|
|
|
|
|
changes that haven't been applied to Linux yet.
|
|
|
|
|
|
|
|
|
|
You can generate the ACPICA release series yourself and rebase your code on
|
2019-04-25 01:52:47 +08:00
|
|
|
top of the generated ACPICA release patches::
|
2016-07-07 15:10:36 +08:00
|
|
|
|
|
|
|
|
$ git clone https://github.com/acpica/acpica
|
|
|
|
|
$ cd acpica
|
|
|
|
|
$ generate/linux/make-patches.sh -u [commit ID]
|
|
|
|
|
|
|
|
|
|
The commit ID should be the last ACPICA commit accepted by Linux. Usually,
|
|
|
|
|
it is the commit modifying ACPI_CA_VERSION. It can be found by executing
|
|
|
|
|
"git blame source/include/acpixf.h" and referencing the line that contains
|
|
|
|
|
"ACPI_CA_VERSION".
|
|
|
|
|
|
|
|
|
|
3. Inspect the current divergences
|
|
|
|
|
|
|
|
|
|
If you have local copies of both Linux and upstream ACPICA, you can generate
|
2019-04-25 01:52:47 +08:00
|
|
|
a diff file indicating the state of the current divergences::
|
2016-07-07 15:10:36 +08:00
|
|
|
|
|
|
|
|
# git clone https://github.com/acpica/acpica
|
|
|
|
|
# git clone http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
|
|
|
|
|
# cd acpica
|
|
|
|
|
# generate/linux/divergences.sh -s ../linux
|
