Vortex GPGPU

Vortex is a full-stack open-source RISC-V GPGPU.

Specifications

• Support RISC-V RV32IMAF and RV64IMAFD
• Microarchitecture:
  • configurable number of cores, warps, and threads.
  • configurable number of ALU, FPU, LSU, and SFU units per core.
  • configurable pipeline issue width.
  • optional graphics rasterizer, texture, and OM units.
  • optional local memory, L1, L2 and L3 caches.
• Software: OpenCL 1.2 Support.
• Supported FPGAs:
  • Altera Arria 10
  • Altera Stratix 10
  • Xilinx Alveo U50, U250, U280
  • Xilinx Versal VCK5000

Directory structure

• doc: Documentation.
• hw: Hardware sources.
• driver: Host drivers repository.
• runtime: Kernel Runtime software.
• sim: Simulators repository.
• tests: Tests repository.
• ci: Continuous integration scripts.
• miscs: Miscellaneous resources.

Build Instructions

More detailed build instructions can be found here.

Supported OS Platforms

• Ubuntu 18.04, 20.04
• Centos 7

Toolchain Dependencies

• POCL
• LLVM
• RISCV-GNU-TOOLCHAIN
• Verilator
• FpNew
• SoftFloat
• CocoGfx
• Ramulator
• Yosys
• Sv2v

Install development tools

sudo apt-get install build-essential
sudo apt-get install binutils
sudo apt-get install python
sudo apt-get install uuid-dev
sudo apt-get install git

Install Vortex codebase

git clone --depth=1 --recursive https://github.com/vortexgpgpu/vortex.git
cd vortex

Configure your build folder

mkdir build
cd build
../configure --xlen=32 --tooldir=$HOME/tools

Install prebuilt toolchain

./ci/toolchain_install.sh --all

Set environment variables

# should always run before using the toolchain!
source ./ci/toolchain_env.sh

Building Vortex

make -s

Quick demo rendering a 3D scene using 2 cores

<p align="center"> <a href="docs/assets/img/tekkaman_1024x1024.png"> <img src="docs/assets/img/tekkaman_1024x1024.png" alt="output" width=256/> </a> </p>

CONFIGS="-DEXT_GFX_ENABLE" ./ci/blackbox.sh --driver=simx --app=draw3d --args="-ttekkaman.cgltrace -w256 -h256" --cores=2

The generated image will be written to <span style="color: yellow;">tests/regression/draw3d/output.png</span>

Common Developer Tips

• Installing Vortex kernel and runtime libraries to use with external tools requires passing --prefix=<install-path> to the configure script.

../configure --xlen=32 --tooldir=$HOME/tools --prefix=<install-path>
make -s
make install

• Building Vortex 64-bit simply requires using --xlen=64 configure option.

../configure --xlen=32 --tooldir=$HOME/tools

• Sourcing "./ci/toolchain_env.sh" is required everytime you start a new terminal. we recommend adding "source <build-path>/ci/toolchain_env.sh" to your ~/.bashrc file to automate the process at login.

echo "source <build-path>/ci/toolchain_env.sh" >> ~/.bashrc

• Making changes to Makefiles in your source tree or adding new folders will require executing the "configure" script again to get it propagated into your build folder.

../configure

• To debug the GPU, you can generate a "run.log" trace. see /docs/debugging.md for more information.

./ci/blackbox.sh --app=demo --debug=3

• For additional information, check out the /docs.