Panfrost
========

The Panfrost driver stack includes an OpenGL ES implementation for Arm Mali
GPUs based on the Midgard and Bifrost microarchitectures. It is **conformant**
on `Mali-G52 <https://www.khronos.org/conformance/adopters/conformant-products/opengles#submission_949>`__,
`Mali-G57 <https://www.khronos.org/conformance/adopters/conformant-products/opengles#submission_980>`__
and `Mali-G610 <https://www.khronos.org/conformance/adopters/conformant-products/opengles#submission_1053>`__,
but **non-conformant** on other GPUs.

PanVK, the Vulkan implementation in the Panfrost driver stack, is currently
**conformant** on `Mali-G610 <https://www.khronos.org/conformance/adopters/conformant-products#submission_939>`__,
but *non-conformant* on other GPUs.

The following hardware is currently supported:

+--------------------+---------------+-----------+--------+--------+
| Models             | Architecture  | OpenGL ES | OpenGL | Vulkan |
+====================+===============+===========+========+========+
| T600, T620, T720   | Midgard (v4)  | 2.0       | 2.1    |        |
+--------------------+---------------+-----------+--------+--------+
| T760, T820, T830   | Midgard (v5)  | 3.1       | 3.1    |        |
| T860, T880         |               |           |        |        |
+--------------------+---------------+-----------+--------+--------+
| G72                | Bifrost (v6)  | 3.1       | 3.1    | 1.0    |
+--------------------+---------------+-----------+--------+--------+
| G31, G51, G52, G76 | Bifrost (v7)  | 3.1       | 3.1    | 1.0    |
+--------------------+---------------+-----------+--------+--------+
| G57                | Valhall (v9)  | 3.1       | 3.1    |        |
+--------------------+---------------+-----------+--------+--------+
| G310, G610         | Valhall (v10) | 3.1       | 3.1    | 1.4    |
+--------------------+---------------+-----------+--------+--------+
| G720               | 5th Gen (v12) | 3.1       | 3.1    | 1.4    |
+--------------------+---------------+-----------+--------+--------+
| G725               | 5th Gen (v13) | 3.1       | 3.1    | 1.4    |
+--------------------+---------------+-----------+--------+--------+

Other Midgard and Bifrost chips (e.g. G71) are not yet supported.

Older Mali chips based on the Utgard architecture (Mali-400, Mali-450) are
supported in the :doc:`Lima <lima>` driver, not Panfrost. Lima is also
available in Mesa.

Other graphics APIs (OpenCL) are not supported at this time.

Building
--------

Panfrost's OpenGL support is a Gallium driver. Since Mali GPUs are 3D-only and
do not include a display controller, Mesa uses kmsro to support display
controllers paired with Mali GPUs. If your board with a Panfrost supported GPU
has a display controller with mainline Linux support not supported by kmsro,
it's easy to add support, see the commit ``cff7de4bb597e9`` as an example.

Build like ``meson . build/ -Dvulkan-drivers=panfrost
-Dgallium-drivers=panfrost`` for a build directory
``build``.

LLVM is required by Panfrost's compilers at build time.

In case of cross compilation without LLVM,
you can build and install the required tools on the host (with LLVM installed) with
``meson . build-host/ -Dtools=panfrost -Dmesa-clc=enabled -Dinstall-mesa-clc=true
-Dprecomp-compiler=enabled -Dinstall-precomp-compiler=true``
and then use ``-Dmesa-clc=system -Dprecomp-compiler=system`` on the cross compile side.

For general information on building Mesa, read :doc:`the install documentation
<../install>`.

Chat
----

Panfrost developers and users hang out on IRC at ``#panfrost`` on OFTC. Note
that registering and authenticating with ``NickServ`` is required to prevent
spam. `Join the chat. <https://webchat.oftc.net/?channels=panfrost>`__

Technical details
-----------------

You can read more technical details about Panfrost here:

.. toctree::
   :glob:

   panfrost/*
