2019-03-07 15:47:15 +00:00
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Contributor's Guide
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===================
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2017-06-28 15:23:03 +01:00
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Getting Started
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---------------
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2020-05-12 09:36:05 +01:00
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- Make sure you have a Github account and you are logged on both
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`developer.trustedfirmware.org`_ and `review.trustedfirmware.org`_.
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2017-06-28 15:23:03 +01:00
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2020-08-03 09:27:19 +01:00
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- If you plan to contribute a major piece of work, it is usually a good idea to
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start a discussion around it on the mailing list. This gives everyone
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visibility of what is coming up, you might learn that somebody else is
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already working on something similar or the community might be able to
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provide some early input to help shaping the design of the feature.
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If you intend to include Third Party IP in your contribution, please mention
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it explicitly in the email thread and ensure that the changes that include
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Third Party IP are made in a separate patch (or patch series).
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2017-06-28 15:23:03 +01:00
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2019-05-29 13:59:40 +01:00
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- Clone `Trusted Firmware-A`_ on your own machine as described in
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:ref:`prerequisites_get_source`.
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2020-08-12 10:29:46 +01:00
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2019-05-28 13:13:39 +01:00
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- Create a local topic branch based on the `Trusted Firmware-A`_ ``master``
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2017-06-28 15:23:03 +01:00
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branch.
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Making Changes
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--------------
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- Make commits of logical units. See these general `Git guidelines`_ for
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contributing to a project.
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2020-08-12 10:29:46 +01:00
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2017-06-28 15:23:03 +01:00
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- Keep the commits on topic. If you need to fix another bug or make another
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enhancement, please address it on a separate topic branch.
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2020-08-12 10:29:46 +01:00
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2020-08-14 14:58:50 +01:00
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- Split the patch in manageable units. Small patches are usually easier to
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review so this will speed up the review process.
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2017-06-28 15:23:03 +01:00
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- Avoid long commit series. If you do have a long series, consider whether
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some commits should be squashed together or addressed in a separate topic.
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2020-08-12 10:29:46 +01:00
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2020-08-14 14:58:50 +01:00
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- Ensure that each commit in the series has at least one ``Signed-off-by:``
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line, using your real name and email address. The names in the
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``Signed-off-by:`` and ``Commit:`` lines must match. By adding this line the
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contributor certifies the contribution is made under the terms of the
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:download:`Developer Certificate of Origin <../../dco.txt>`.
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There might be multiple ``Signed-off-by:`` lines, depending on the history
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of the patch.
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More details may be found in the `Gerrit Signed-off-by Lines guidelines`_.
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- Ensure that each commit also has a unique ``Change-Id:`` line. If you have
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cloned the repository with the "`Clone with commit-msg hook`" clone method
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(following the :ref:`Prerequisites` document), this should already be the
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case.
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More details may be found in the `Gerrit Change-Ids documentation`_.
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- Write informative and comprehensive commit messages. A good commit message
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provides all the background information needed for reviewers to understand
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the intent and rationale of the patch. This information is also useful for
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future reference.
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For example:
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- What does the patch do?
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- What motivated it?
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- What impact does it have?
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- How was it tested?
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- Have alternatives been considered? Why did you choose this approach over
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another one?
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- If it fixes an `issue`_, include a reference.
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- Follow the :ref:`Coding Style` and :ref:`Coding Guidelines`.
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- Use the checkpatch.pl script provided with the Linux source tree. A
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Makefile target is provided for convenience, see :ref:`this
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section<automatic-compliance-checking>` for more details.
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2020-08-12 10:29:46 +01:00
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- Where appropriate, please update the documentation.
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- Consider whether the :ref:`Porting Guide`, :ref:`Firmware Design` document
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or other in-source documentation needs updating.
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2020-05-12 09:36:05 +01:00
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- If you are submitting new files that you intend to be the code owner for
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(for example, a new platform port), then also update the
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:ref:`code owners` file.
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- For topics with multiple commits, you should make all documentation changes
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(and nothing else) in the last commit of the series. Otherwise, include
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the documentation changes within the single commit.
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2020-08-17 07:52:33 +01:00
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.. _copyright-license-guidance:
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2020-08-12 10:29:46 +01:00
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- Ensure that each changed file has the correct copyright and license
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information. Files that entirely consist of contributions to this project
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should have a copyright notice and BSD-3-Clause SPDX license identifier of
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the form as shown in :ref:`license`. Files that contain changes to imported
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Third Party IP files should retain their original copyright and license
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notices.
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For significant contributions you may add your own copyright notice in the
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following format:
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::
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Portions copyright (c) [XXXX-]YYYY, <OWNER>. All rights reserved.
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where XXXX is the year of first contribution (if different to YYYY) and YYYY
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is the year of most recent contribution. <OWNER> is your name or your company
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name.
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2020-08-14 14:58:50 +01:00
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- Ensure that each patch in the patch series compiles in all supported
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configurations. Patches which do not compile will not be merged.
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2019-03-22 11:47:22 +00:00
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- Please test your changes. As a minimum, ensure that Linux boots on the
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2019-05-29 13:59:40 +01:00
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Foundation FVP. See :ref:`Arm Fixed Virtual Platforms (FVP)` for more
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information. For more extensive testing, consider running the `TF-A Tests`_
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against your patches.
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2020-08-14 14:58:50 +01:00
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- Ensure that all CI automated tests pass. Failures should be fixed. They might
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block a patch, depending on how critical they are.
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2017-06-28 15:23:03 +01:00
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Submitting Changes
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------------------
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2020-08-14 14:58:50 +01:00
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- Submit your changes for review at https://review.trustedfirmware.org
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targeting the ``integration`` branch.
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2019-03-22 11:47:22 +00:00
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2020-08-14 14:58:50 +01:00
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- Add reviewers for your patch:
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2019-03-22 11:47:22 +00:00
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2020-08-14 14:58:50 +01:00
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- At least one code owner for each module modified by the patch. See the list
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of modules and their :ref:`code owners`.
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2019-03-22 11:47:22 +00:00
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2020-08-14 14:58:50 +01:00
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- At least one maintainer. See the list of :ref:`maintainers`.
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2019-03-22 11:47:22 +00:00
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2020-08-14 14:58:50 +01:00
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- If some module has no code owner, try to identify a suitable (non-code
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owner) reviewer. Running ``git blame`` on the module's source code can
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help, as it shows who has been working the most recently on this area of
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the code.
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2020-08-14 14:58:50 +01:00
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Alternatively, if it is impractical to identify such a reviewer, you might
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send an email to the `TF-A mailing list`_ to broadcast your review request
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to the community.
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Note that self-reviewing a patch is prohibited, even if the patch author is
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the only code owner of a module modified by the patch. Getting a second pair
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of eyes on the code is essential to keep up with the quality standards the
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project aspires to.
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- The changes will then undergo further review by the designated people. Any
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review comments will be made directly on your patch. This may require you to
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do some rework. For controversial changes, the discussion might be moved to
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the `TF-A mailing list`_ to involve more of the community.
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2017-06-28 15:23:03 +01:00
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2019-03-22 11:47:22 +00:00
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Refer to the `Gerrit Uploading Changes documentation`_ for more details.
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2017-06-28 15:23:03 +01:00
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2020-08-14 14:58:50 +01:00
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- The patch submission rules are the following. For a patch to be approved
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and merged in the tree, it must get:
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- One ``Code-Owner-Review+1`` for each of the modules modified by the patch.
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- A ``Maintainer-Review+1``.
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In the case where a code owner could not be found for a given module,
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``Code-Owner-Review+1`` is substituted by ``Code-Review+1``.
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In addition to these various code review labels, the patch must also get a
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``Verified+1``. This is usually set by the Continuous Integration (CI) bot
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when all automated tests passed on the patch. Sometimes, some of these
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automated tests may fail for reasons unrelated to the patch. In this case,
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the maintainers might (after analysis of the failures) override the CI bot
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score to certify that the patch has been correctly tested.
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In the event where the CI system lacks proper tests for a patch, the patch
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author or a reviewer might agree to perform additional manual tests
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in their review and the reviewer incorporates the review of the additional
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testing in the ``Code-Review+1`` or ``Code-Owner-Review+1`` as applicable to
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attest that the patch works as expected. Where possible additional tests should
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be added to the CI system as a follow up task. For example, for a
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platform-dependent patch where the said platform is not available in the CI
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system's board farm.
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doc: Convert internal links to RST format
Currently links between documents are using the format:
<path/to/><filename>.rst
This was required for services like GitHub because they render each
document in isolation - linking to another document is like linking
to any other file, just provide the full path.
However, with the new approach, the .rst files are only the raw
source for the documents. Once the documents have been rendered
the output is now in another format (HTML in our case) and so,
when linking to another document, the link must point to the
rendered version and not the .rst file.
The RST spec provides a few methods for linking between content.
The parent of this patch enabled the automatic creation of anchors
for document titles - we will use these anchors as the targets for
our links. Additional anchors can be added by hand if needed, on
section and sub-section titles, for example.
An example of this new format, for a document with the title
"Firmware Design" is :ref:`Firmware Design`.
One big advantage of this is that anchors are not dependent on
paths. We can then move documents around, even between directories,
without breaking any links between documents. Links will need to be
updated only if the title of a document changes.
Change-Id: I9e2340a61dd424cbd8fd1ecc2dc166f460d81703
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
2019-04-12 14:19:42 +01:00
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- When the changes are accepted, the :ref:`maintainers` will integrate them.
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2017-06-28 15:23:03 +01:00
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doc: Convert internal links to RST format
Currently links between documents are using the format:
<path/to/><filename>.rst
This was required for services like GitHub because they render each
document in isolation - linking to another document is like linking
to any other file, just provide the full path.
However, with the new approach, the .rst files are only the raw
source for the documents. Once the documents have been rendered
the output is now in another format (HTML in our case) and so,
when linking to another document, the link must point to the
rendered version and not the .rst file.
The RST spec provides a few methods for linking between content.
The parent of this patch enabled the automatic creation of anchors
for document titles - we will use these anchors as the targets for
our links. Additional anchors can be added by hand if needed, on
section and sub-section titles, for example.
An example of this new format, for a document with the title
"Firmware Design" is :ref:`Firmware Design`.
One big advantage of this is that anchors are not dependent on
paths. We can then move documents around, even between directories,
without breaking any links between documents. Links will need to be
updated only if the title of a document changes.
Change-Id: I9e2340a61dd424cbd8fd1ecc2dc166f460d81703
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
2019-04-12 14:19:42 +01:00
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- Typically, the :ref:`maintainers` will merge the changes into the
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2019-03-22 11:47:22 +00:00
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``integration`` branch.
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2020-08-14 14:58:50 +01:00
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2019-03-22 11:47:22 +00:00
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- If the changes are not based on a sufficiently-recent commit, or if they
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doc: Convert internal links to RST format
Currently links between documents are using the format:
<path/to/><filename>.rst
This was required for services like GitHub because they render each
document in isolation - linking to another document is like linking
to any other file, just provide the full path.
However, with the new approach, the .rst files are only the raw
source for the documents. Once the documents have been rendered
the output is now in another format (HTML in our case) and so,
when linking to another document, the link must point to the
rendered version and not the .rst file.
The RST spec provides a few methods for linking between content.
The parent of this patch enabled the automatic creation of anchors
for document titles - we will use these anchors as the targets for
our links. Additional anchors can be added by hand if needed, on
section and sub-section titles, for example.
An example of this new format, for a document with the title
"Firmware Design" is :ref:`Firmware Design`.
One big advantage of this is that anchors are not dependent on
paths. We can then move documents around, even between directories,
without breaking any links between documents. Links will need to be
updated only if the title of a document changes.
Change-Id: I9e2340a61dd424cbd8fd1ecc2dc166f460d81703
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
2019-04-12 14:19:42 +01:00
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cannot be automatically rebased, then the :ref:`maintainers` may rebase it
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on the ``integration`` branch or ask you to do so.
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2020-08-14 14:58:50 +01:00
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2019-03-22 11:47:22 +00:00
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- After final integration testing, the changes will make their way into the
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2020-05-12 09:36:05 +01:00
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``master`` branch. If a problem is found during integration, the
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:ref:`maintainers` will request your help to solve the issue. They may
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revert your patches and ask you to resubmit a reworked version of them or
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they may ask you to provide a fix-up patch.
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2017-06-28 15:23:03 +01:00
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2019-04-19 00:47:46 +01:00
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Binary Components
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-----------------
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- Platforms may depend on binary components submitted to the `Trusted Firmware
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binary repository`_ if they require code that the contributor is unable or
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unwilling to open-source. This should be used as a rare exception.
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- All binary components must follow the contribution guidelines (in particular
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licensing rules) outlined in the `readme.rst <tf-binaries-readme_>`_ file of
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the binary repository.
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- Binary components must be restricted to only the specific functionality that
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cannot be open-sourced and must be linked into a larger open-source platform
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port. The majority of the platform port must still be implemented in open
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source. Platform ports that are merely a thin wrapper around a binary
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component that contains all the actual code will not be accepted.
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- Only platform port code (i.e. in the ``plat/<vendor>`` directory) may rely on
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binary components. Generic code must always be fully open-source.
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2017-06-28 15:23:03 +01:00
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--------------
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2019-05-16 13:33:18 +01:00
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*Copyright (c) 2013-2020, Arm Limited and Contributors. All rights reserved.*
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2019-03-22 11:47:22 +00:00
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.. _developer.trustedfirmware.org: https://developer.trustedfirmware.org
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.. _review.trustedfirmware.org: https://review.trustedfirmware.org
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.. _issue: https://developer.trustedfirmware.org/project/board/1/
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.. _Trusted Firmware-A: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
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.. _Git guidelines: http://git-scm.com/book/ch5-2.html
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.. _Gerrit Uploading Changes documentation: https://review.trustedfirmware.org/Documentation/user-upload.html
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.. _Gerrit Signed-off-by Lines guidelines: https://review.trustedfirmware.org/Documentation/user-signedoffby.html
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.. _Gerrit Change-Ids documentation: https://review.trustedfirmware.org/Documentation/user-changeid.html
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2020-05-12 09:36:05 +01:00
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.. _TF-A Tests: https://trustedfirmware-a-tests.readthedocs.io
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.. _Trusted Firmware binary repository: https://review.trustedfirmware.org/admin/repos/tf-binaries
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.. _tf-binaries-readme: https://git.trustedfirmware.org/tf-binaries.git/tree/readme.rst
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.. _TF-A mailing list: https://lists.trustedfirmware.org/mailman/listinfo/tf-a
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