OpenCL on Ubuntu 24.04 with open source drivers only

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Running OpenCL on Linux with older AMD GPU (not supported by ROCm) has been mostly disappointing.

Recently, I've stumbled upon Rusticl which an OpenCL implementation on Mesa Galium driver.

However, my current Ubuntu 24.04 does not come with latest mesa packages and I'd prefer to not install kisak-mesa PPA which can sometimes mess up the system when upgrading Ubuntu.

It seems that Fedora comes with latest Mesa packages with rusticl enabled and I found this blog describing how to install the required packages: https://nullr0ute.com/2023/12/getting-started-with-opencl-using-mesa-rusticl/

Based on that, I've found a way to use OpenCL with rusticl within podman/docker container.

Here's the Dockerfile:

FROM fedora

ENV RUSTICL_ENABLE=radeonsi
ENV http_proxy=http://192.168.0.130:3128/

RUN dnf install -y mesa-libOpenCL mesa-dri-drivers spirv-llvm-translator spirv-tools-libs clinfo clpeak
RUN cd /root && \
    curl -L https://cdn.geekbench.com/Geekbench-6.3.0-Linux.tar.gz -O && \
    tar xaf Geekbench-6.3.0-Linux.tar.gz && \
    rm -f Geekbench-6.3.0-Linux.tar.gz

ENV PATH="$PATH:/root/Geekbench-6.3.0-Linux"
WORKDIR /root/Geekbench-6.3.0-Linux/

Build the podman/docker image:

$ podman build -t ocl_geekbench6 -f  ./Dockerfile

Podman/Docker command:

# To get the list of OpenCL GPUs:

$ podman run -it --rm --device=/dev/dri --security-opt seccomp=unconfined ocl_geekbench6 clinfo --list
Platform #0: Clover
 `-- Device #0: AMD Radeon RX Vega M GH Graphics (radeonsi, vegam, LLVM 19.1.0, DRM 3.57, 6.8.0-51-generic)
Platform #1: rusticl
 `-- Device #0: AMD Radeon RX Vega M GH Graphics (radeonsi, vegam, LLVM 19.1.0, DRM 3.57, 6.8.0-51-generic)

# To run geekbench on rusticl (platform #1):

$ podman run -it --rm --device=/dev/dri --security-opt seccomp=unconfined ocl_geekbench6 geekbench6 --gpu opencl --gpu-platform 1

Geekbench 6.3.0 : https://www.geekbench.com/

Geekbench 6 requires an active internet connection and automatically uploads
benchmark results to the Geekbench Browser.

...

OpenCL Information
  Platform Vendor               Mesa/X.org
  Platform Name                 rusticl
  Device Vendor                 AMD
  Device Name                   AMD Radeon RX Vega M GH Graphics (radeonsi, vegam, LLVM 19.1.0, DRM 3.57, 6.8.0-51-generic)
  Device Driver Version         24.2 .8
  Maximum Frequency             1190 MHz
  Compute Units                 24
  Device Memory                 4.00 GB


OpenCL
  Running Background Blur
  Running Face Detection
  Running Horizon Detection
  Running Edge Detection
  Running Gaussian Blur
  Running Feature Matching
  Running Stereo Matching
  Running Particle Physics



 



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