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| author | Android Partner Docs <noreply@android.com> | 2018-08-08 13:50:33 -0700 |
|---|---|---|
| committer | Clay Murphy <claym@google.com> | 2018-08-08 14:05:32 -0700 |
| commit | ea448b829ef3c5eefcadcd50fdf74c873eeadd86 (patch) | |
| tree | 34c2647a8d8c2dffdbcdac2c5ba11d41d1426da8 /en/devices/architecture/vintf/fcm.html | |
| parent | 19a77ba572d415186ce503e4bf8be87fe45d08eb (diff) | |
| download | source.android.com-ea448b829ef3c5eefcadcd50fdf74c873eeadd86.tar.gz | |
Docs: Changes to source.android.com
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PiperOrigin-RevId: 207940242
Change-Id: I3dee204c744e2e6062ac56810b88aefabf84636a
Diffstat (limited to 'en/devices/architecture/vintf/fcm.html')
| -rw-r--r-- | en/devices/architecture/vintf/fcm.html | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/en/devices/architecture/vintf/fcm.html b/en/devices/architecture/vintf/fcm.html new file mode 100644 index 00000000..7087915b --- /dev/null +++ b/en/devices/architecture/vintf/fcm.html @@ -0,0 +1,446 @@ +<html devsite> + <head> + <title>FCM Lifecycle</title> + <meta name="project_path" value="/_project.yaml" /> + <meta name="book_path" value="/_book.yaml" /> + </head> + {% include "_versions.html" %} + <body> + <!-- + Copyright 2018 The Android Open Source Project + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + --> + +<p>An Android framework release has multiple Framework Compatibility Matrices +(FCMs)—one for each upgradable Target FCM Version—that define what +the framework may use and Target FCM version requirements. As part of the FCM +lifecycle, Android deprecates and removes HIDL HALs, then modifies FCM files to +reflect the status of the <a href="#hal-version-status">HAL Version</a>. + +<p>To enable framework-only OTAs in their own ecosystems, partners who extend +vendor interfaces should also deprecate and remove HIDL HALs using the same +methods.</p> + +<aside class="note"><strong>Note:</strong> For more details on HIDL HALs, see +<a href="/devices/architecture/vintf/comp-matrices">Compatibility Matrices</a>, +<a href="/devices/architecture/vintf/match-rules">Matching Rules</a>, and +<a href="/devices/architecture/hidl/versioning">HIDL HAL Versioning</a>.</aside> + +<h2 id=terminology>Terminology</h2> + +<table> +<tr> +<th>Framework Compatibility Matrix (FCM)</th> +<td>An XML file that specifies framework requirements on conforming vendor +implementations. The compatibility matrix is versioned, and a new version +is frozen for each framework release. Each framework release contains +multiple FCMs.</td> +</tr> +<tr> +<th>Platform FCM Versions (S<sub>F</sub>)</th> +<td>The set of all FCM versions in a framework release. The framework can work +with any vendor implementation that satisfies one of these FCMs.</td> +</tr> +<tr> +<th>FCM Version (F)</th> +<td>The highest version among all FCMs in a framework release.</td> +</tr> +<tr> +<th>Target FCM Version (V)</th> +<td>The targeted FCM version (from S<sub>F</sub>), declared explicitly in the + device manifest, that a vendor implementation satisfies. A vendor + implementation must be generated against a published FCM, although it may +declare newer HAL versions in its Device Manifest.</td> +</tr> +<tr> +<th>HAL Version</th> +<td>A HAL Version has the format <code>foo@x.y</code>, where <code>foo</code> +is the HAL name and <code>x.y</code> is the specific version; e.g. +<code>nfc@1.0</code>, <code>keymaster@3.0</code> (the root prefix, e.g. +<code>android.hardware</code>, is omitted throughout this document.)</td> +</tr> +<tr> +<th>Device Manifest</th> +<td>An XML file that specifies what HAL versions the vendor image provides. The +contents of a device manifest are constrained by the Target FCM version of +the device but can list HALs that are strictly newer relative to the FCM +corresponding to V.</td> +</tr> +</table> + + +<h2 id=develop-new-fcm>Developing in a new FCM Version</h2> +<p>Android increments the FCM Version for each framework release (such as +Android 8, 8.1, etc). During development, the new +<code>compatibility_matrix.current.xml</code> is created (<code>F</code>) and +the existing <code>compatibility_matrix.f.xml</code> (where <code>f</code> < +<code>F</code>) is no longer changed.</p> + +<p>To start developing in a new FCM Version <code>F</code>:</p> + +<ol> +<li>Copy the latest <code>compatibility_matrix.<F-1>.xml</code> to +<code>compatibility_matrix.current.xml</code>.</li> +<li>Update the <code>level</code> attribute in the file to <code>F</code>.</li> +<li>Add corresponding build rules to install this compatibility matrix to the +device.</li> +</ol> + +<h2 id=introduce-new-hal>Introducing a new HAL</h2> +<p>During development, when introducing a new HAL (Wi-Fi, NFC, etc.) to Android +on the current FCM Version <code>F</code>, add the HAL to +<code>compatibility_matrix.current.xml</code> with the following +<code>optional</code> settings:</p> + +<ul> +<li><code>optional="false"</code> if devices that ship with <code>V = F</code> +must launch with this HAL,<br> +<br> +OR +<br> +</li> +<li><code>optional="true"</code> if devices that ship with <code>V = F</code> +can launch without this HAL.</li> +</ul> + +<p>For example, Android 8.1 introduced <code>cas@1.0</code> as an optional HAL. +Devices launching with Android 8.1 are not required to implement this HAL, so +the following entry was added to <code>compatibility_matrix.current.xml</code> +(renamed to <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.2.xml#74" class="external">compatibility_matrix.2.xml</code></a> +after Android 8.1 released):</p> + +<pre class="prettyprint"> +<hal format="hidl" optional="true"> + <name>android.hardware.cas</name> + <version>1.0</version> + <interface> + <name>IMediaCasService</name> + <instance>default</instance> + </interface> +</hal> +</pre> + +<h2 id=upgrade-hal-minor>Upgrading a HAL (minor)</h2> +<p>During development, when a HAL has a minor-version upgrade from +<code>x.z</code> to <code>x.(z+1)</code> at current FCM Version <code>F</code>, +if that version is:</p> + +<ul> +<li>Required on devices launching with <code>V = F</code>, the +<code>compatibility_matrix.current.xml</code> must state <code>x.(z+1)</code>and +<code>optional="false"</code>.</li> +<li>Not required on devices launching with <code>V = F</code>, the +<code>compatibility_matrix.current.xml</code> must copy <code>x.y-z</code> and +optionality from <code>compatibility_matrix.<F-1>.xml</code> and change +the version to <code>x.w-(z+1)</code> (where <code>w >= y</code>).</li> +</ul> + +<p>For example, Android 8.1 introduced <code>broadcastradio@1.1</code> as a +minor version upgrade of 1.0 HAL. The older version, +<code>broadcastradio@1.0</code>, is optional for devices launching with Android +8.0 while the newer version, <code>broadcastradio@1.1</code>, is optional for +devices launching with Android 8.1. In <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.1.xml#58" class="external">compatibility_matrix.1.xml</code></a>:</p> + +<pre class="prettyprint"> +<hal format="hidl" optional="true"> + <name>android.hardware.broadcastradio</name> + <version>1.0</version> + <interface> + <name>IBroadcastRadioFactory</name> + <instance>default</instance> + </interface> +</hal> +</pre> + +<p>This entry was copied to <code>compatibility_matrix.current.xml</code> +(renamed to <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.2.xml#58">compatibility_matrix.2.xml</code></a> +after Android 8.1 released) and modified as follows:</p> + +<pre class="prettyprint"> +<hal format="hidl" optional="true"> + <name>android.hardware.broadcastradio</name> + <version>1.0-1</version> + <interface> + <name>IBroadcastRadioFactory</name> + <instance>default</instance> + </interface> +</hal> +</pre> + +<h2 id=upgrade-hal-major>Upgrading a HAL (major)</h2> +<p>During development, when a HAL has a major-version upgrade at current FCM +Version <code>F</code>, the new major version <code>x.0</code> is added to +<code>compatibility_matrix.current.xml</code> with the following +<code>optional</code> settings:</p> + +<ul> +<li><code>optional="false"</code> with only version <code>x.0</code>, if devices +that ship with <code>V = F</code> must launch with <code>x.0</code>.</li> +<li><code>optional="false"</code> but along with older major versions in the +same <code><hal></code> tag, if devices that ship with <code>V = F</code> +must launch with this HAL, but can launch with an older major version.</li> +<li><code>optional="true"</code> if devices that ship with <code>V = F</code> do +not have to launch the HAL.</li> +</ul> + +<p>For example, Android {{ androidPVersionNumber }} introduces +<code>health@2.0</code> as a major-version upgrade of the 1.0 HAL and deprecates +the 1.0 HAL. The older version, <code>health@1.0</code>, is optional for devices +launching with Android 8.0 and Android 8.1. Devices launching with Android +{{ androidPVersionNumber }} must not provide the deprecated 1.0 HAL and must +instead provide the new 2.0 version. In <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.legacy.xml#150" class="external">compatibility_matrix.legacy.xml</code></a>, +<code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.1.xml#150" class="external">compatibility_matrix.1.xml</code></a>, +and <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.2.xml#158" class="external">compatibility_matrix.2.xml</code></a>:</p> + +<pre class="prettyprint"> +<hal format="hidl" optional="true"> + <name>android.hardware.health</name> + <version>1.0</version> + <interface> + <name>IHealth</name> + <instance>default</instance> + </interface> +</hal> +</pre> + +<p>This entry is copied to <code>compatibility_matrix.current.xml</code> +(renamed to <code>compatibility_matrix.3.xml</code> with the Android +{{ androidPVersionNumber }} release) and modified as follows:</p> + +<pre class="prettyprint"> +<hal format="hidl" optional="false"> + <name>android.hardware.health</name> + <version>2.0</version> + <interface> + <name>IHealth</name> + <instance>default</instance> + </interface> +</hal> +</pre> + +<p>Restrictions:</p> +<ul> +<li>Because the 2.0 HAL is in <code>compatibility_matrix.3.xml</code> with +<code>optional="false"</code>, devices that launch with Android +{{ androidPVersionNumber }} must ship with 2.0 HAL.</li> +<li>Because the 1.0 HAL is not in <code>compatibility_matrix.3.xml</code>, +devices that launch with Android {{ androidPVersionNumber }} must not provide +the 1.0 HAL (as this HAL is considered deprecated).</li> +<li>Because the 1.0 HAL is present in legacy/1/2.xml (older FCM Versions that +Android {{ androidPVersionNumber }} can work with) as an optional HAL, the +Android {{ androidPVersionNumber }} framework can still work with the 1.0 HAL +(which is not considered a removed HAL Version).</li> +</ul> + +<h2 id=new-fcm-versions>New FCM Versions</h2> +<p>The process of releasing an FCM Version is done solely by Google as part of +an AOSP release and includes the following steps:</p> + +<ol> +<li>Rename <code>compatibility_matrix.current.xml</code> to +<code>compatibility_matrix.F.xml</code>.</li> +<li>Ensure the file has the attribute <code>level="F"</code>.</li> +<li>Edit corresponding <a +href="https://android.googlesource.com/platform/hardware/interfaces/+/2d8442c76270b2c32816d1dac56bbd536b0bf790/compatibility_matrices/Android.mk" class="external">build +rules</a> to reflect the file name change.</li> +<li>Ensure all devices build and boot.</li> +<li><a +href="https://android.googlesource.com/platform/test/vts-testcase/hal/+/95e09aca7711cace6184077debc556b05335a8b1/treble/vintf/vts_treble_vintf_test.cpp#87" class="external">Update +VTS tests</a> to ensure devices launching with the latest framework (based +on Shipping API level) have Target FCM Version <code>V >= F</code>.</li> +<li>Publish file to AOSP.</li> +</ol> + +<p>This file <strong>cannot</strong> be changed once renamed and published. For +example, during Android {{ androidPVersionNumber }} development the following +files are <a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/Android.mk" class="external">built</a> +for <code>hardware/interfaces/compatibility_matrices/</code>:</p> + +<ul> +<li><code>compatibility_matrix.legacy.xml</code></li> +<li><code>compatibility_matrix.1.xml</code></li> +<li><code>compatibility_matrix.2.xml</code></li> +<li><code>compatibility_matrix.current.xml</code></li> +</ul> + +<p>When Android {{ androidPVersionNumber }} is released, +<code>compatibility_matrix.current.xml</code> is renamed to +<code>compatibility_matrix.3.xml</code> and the following files are +built for <code>hardware/interfaces/compatibility_matrices/</code>:</p> + +<ul> +<li><code>compatibility_matrix.legacy.xml</code></li> +<li><code>compatibility_matrix.1.xml</code></li> +<li><code>compatibility_matrix.2.xml</code></li> +<li><code>compatibility_matrix.3.xml</code></li> +</ul> + +<p> +<a href="https://android.googlesource.com/platform/test/vts-testcase/hal/+/95e09aca7711cace6184077debc556b05335a8b1/treble/vintf/vts_treble_vintf_test.cpp#435" class="external">VTS +tests</a> ensure that devices launching with Android {{ androidPVersionNumber }} +have Target FCM Version >= 3.</p> + +<h2 id=hal-version-deprecation>HAL Version deprecation</h2> + +<p>Deprecating a HAL Version is a developer decision (i.e. for AOSP HALs, Google +makes the decision). It could happen when a higher HAL version (whether minor or +major) is released. When a given HAL <code>foo@x.y</code> is deprecated at FCM +Version <code>F</code>, it means that any device launching with Target FCM +Version <code>V = F</code> or later must not implement <code>foo</code> at +version <code>x.y</code> or any version older than <code>x.y</code>. A +deprecated HAL version is still supported by the framework for upgrading +devices.</p> + +<p>When FCM Version <code>F</code> is released, a HAL Version +<code>foo@x.y</code> is considered deprecated if the specific HAL Version is not +explicitly stated in the latest FCM for Target FCM Version <code>V = F</code>. +For devices launching with <code>V</code>, one of the following conditions is +true:</p> + +<ul> +<li>The framework requires a higher version (major or minor);</li> +<li>The framework doesn't require the HAL anymore.</li> +</ul> + +<p>For example, in Android {{ androidPVersionNumber }}, <code>health@2.0</code> +is introduced as a major version upgrade of 1.0 HAL. <code>health@1.0</code> is +removed from <code>compatibility_matrix.3.xml</code> but is present in <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.legacy.xml#150" class="external">compatibility_matrix.legacy.xml</code></a>, +<code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.1.xml#150" class="external">compatibility_matrix.1.xml</code></a>, +and <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.2.xml#158" class="external">compatibility_matrix.2.xml</code></a>. +Hence, <code>health@1.0</code> is considered deprecated.</p> + +<h2 id=removal-of-support>Removal of support for Target FCM Versions</h2> +<p>When active devices of a certain Target FCM Version <code>V</code> drop below +a certain threshold, the Target FCM Version is removed from the set +S<sub>F</sub> of the next framework release. This is done by removing +<code>compatibility_matrix.V.xml</code> from the build rules (so that it is no +longer installed on the system image), and by deleting any code that implemented +or depended on the removed functionality. Devices with a target FCM Version +outside of S<sub>F</sub> for a given framework release cannot upgrade to that +release.</p> + +<h2 id=hal-version-status>HAL Version status</h2> +<p>The following sections describe (in chronological order) the possible states +of a HAL Version.</p> + +<h3 id=hal-unreleased>Unreleased</h3> +<p>If a HAL Version is not in any of the public and frozen compatibility +matrices, it is considered unreleased and possibly in development. This includes +HAL Versions that are only in <code>compatibility_matrix.current.xml</code>. +Examples:</p> + +<ul> +<li>During the development of Android {{ androidPVersionNumber }} (before +<code>compatibiility_matrix.current.xml</code> is renamed to +<code>compatibility_matrix.3.xml</code>), the <code>health@2.0</code> HAL was +considered an unreleased HAL.</li> +<li>The <code>teleportation@1.0</code> HAL is not in any released compatibility +matrices, and is also considered an unreleased HAL.</li> +</ul> + +<h3 id=hal-released-and-current>Released and Current</h3> +<p>If a HAL Version is in any public and frozen compatibility matrix, it is +released. For example, after FCM Version 3 is frozen (when +<code>compatibiility_matrix.current.xml</code> is renamed to +<code>compatibility_matrix.3.xml</code>) and published to AOSP, the +<code>health@2.0</code> HAL is considered a released and current HAL Version. +</p> + +<p>If a HAL Version is in a public and frozen compatibility matrix that has +the highest FCM Version (excluding +<code>compatibility_matrix.current.xml</code>), the HAL version is current (i.e. +not deprecated). For example, existing HAL Versions (such as +<code>nfc@1.0</code> introduced in <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.legacy.xml#198" class="external">compatibility_matrix.legacy.xml</code></a>) +that continue to exist in <code>compatibility_matrix.3.xml</code> are also +considered as released and current HAL Versions.</p> + +<h3 id=hal-released-but-deprecated>Released but Deprecated</h3> +<p>A HAL Version is deprecated if and only if:</p> + +<ul> +<li>It is released;</li> +<li>It is not in the public and frozen compatibility matrix that has the highest +FCM Version;</li> +<li>It is in a public and frozen compatibility matrix that the framework still +supports.</li> +</ul> + +<p>Examples:</p> + +<ul> +<li>The <code>health@1.0</code> HAL is in in <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.legacy.xml#150" class="external">compatibility_matrix.legacy.xml</code></a>, +<code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.1.xml#150" class="external">compatibility_matrix.1.xml</code></a>, +and <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.2.xml#158" class="external">compatibility_matrix.2.xml</code></a>, +but not in <code>compatibility_matrix.3.xml</code>. Hence it is considered +deprecated in Android {{ androidPVersionNumber }}.</li> +<li>The power HAL has a minor version upgrade in Android +{{ androidPVersionNumber }}, but <code>power@1.0</code> is still in +<code>compatibility_matrix.3.xml</code>. +<ul> +<li><code>power@1.0</code> is in <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.legacy.xml#206" class="external">compatibility_matrix.legacy.xml</code></a>, +<code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.1.xml#206" class="external">compatibility_matrix.1.xml</code></a>, +and <code><a +href="https://android.googlesource.com/platform/hardware/interfaces/+/241e5aba9ebfe85a9599b333f89be51905148f81/compatibility_matrices/compatibility_matrix.2.xml#222" class="external">compatibility_matrix.2.xml</code></a>.</li> +<li><code>compatibility_matrix.3.xml</code> has <code>power@1.0-1</code>.</li> +</ul> +</li> +</ul> + +<p>Hence <code>power@1.0</code> is current, but <strong>NOT</strong> deprecated, +in Android {{ androidPVersionNumber }}.</p> + +<h3 id=hal-removed>Removed</h3> +<p>A HAL Version is removed if and only if:</p> + +<ul> +<li>It was previously released;</li> +<li>It is not in any public and frozen compatibility matrix that the framework +supports. </li> +</ul> + +<p>Compatibility matrices that are public, frozen, but not supported by the +framework are kept in the code base to define the removed HAL Versions set so +that VTS tests can be written to ensure removed HALs are not on new devices. +</p> + +<h2>Legacy FCMs</h2> +<p>Target FCM Version legacy is a special value for all non-Treble devices. The +legacy FCM, <code>compatibility_matrix.legacy.xml</code>, lists the requirements +of the framework on legacy devices (i.e. devices launched prior to Android 8.0). +</p> + +<p>If this file exists for an FCM with version <code>F</code>, any non-Treble +device can be upgraded to <code>F</code> provided its device manifest is +compatible with this file. Its removal follows the same procedure as FCMs for +other Target FCM Versions (removed after the number of active pre-8.0 devices +drops below a certain threshold).</p> + +</body> +</html> |