rocm-rs: Safe Rust wrappers for AMD ROCm Libraries

This project provides Rust bindings for AMD's ROCm (Radeon Open Compute) libraries, allowing Rust developers to leverage AMD GPUs for high-performance computing.

Current Status

Note: This project is in early development.

Currently implemented:

• ✅ rocFFT - Fast Fourier Transform library (raw bindings + safe wrappers)
• ✅ HIP - Heterogeneous-Compute Interface for Portability (raw bindings + safe wrappers)
• ✅ rocBLAS - Basic Linear Algebra Subprograms (raw bindings + safe wrappers)
• ✅ MIOpen - Deep learning primitives (raw bindings + safe wrappers)
• ✅ rocRAND - Random number generation (raw bindings + safe wrappers)
• ✅ rocSOLVER - Linear system solvers (raw bindings only)
• ✅ rocSPARSE - Sparse linear algebra (raw bindings only)
• ✅ ROCArray - GPU array struct with api similar to Vec (to be deprecated in favor of DeviceMemoryExt)
• ✅ rocmsmi - system managment interface (refer to rocm_smi_lib)
• ✅ rocm_kernel_macros - macros for writing gpu kernels in rust(refer to rocm_kernel_macros)

The project currently focuses on providing raw FFI bindings for most libraries, with safe Rust wrappers available for rocFFT. Additional safe wrappers for other libraries are planned for future development.

Prerequisites

• AMD ROCm installed (version 6.3 or later recommended.It may work on older versions, but I did not test that)
• Ubuntu 24.04 / Fedora 42
• Rust toolchain (1.65.0 or later recommended)
• A compatible AMD GPU

Installation

Add this to your Cargo.toml:

[dependencies]
rocm-rs = "4.2"

Usage

First, ensure that the ROCm libraries are in your library path or set the ROCM_PATH environment variable.

Writing your own kernels with rust

use std::path::PathBuf;

use rocm_kernel_macros::{amdgpu_kernel_attr, amdgpu_kernel_finalize, amdgpu_kernel_init};
use rocm_rs::hip::*;

const LEN: usize = 1024;

// initializing rust gpu kernel
amdgpu_kernel_init!();

// marking code that will be coppied to gpu kernel
#[amdgpu_kernel_attr]
fn kernel(input: *const u32, output: *mut u32) {
    // retriving data from buffere by workitem
    let num = read_by_workitem_id_x(input);

    // writing data back
    write_by_workitem_id_x(output, num * 3);
}

// compiling gpu kernel
const AMDGPU_KERNEL_BINARY_PATH: &str = amdgpu_kernel_finalize!();

fn main() -> Result<()> {
    // setting up device
    let device = Device::new(0)?;
    device.set_current()?;

    // loading gpu kerenel (runs in runtime!)
    let kernel_path = PathBuf::from(AMDGPU_KERNEL_BINARY_PATH);
    assert!(kernel_path.exists());

    let module = Module::load(kernel_path)?;

    // acquiring function handle from gpu kernel
    let function = module.get_function("kernel")?;

    // preparing host side buffers
    let mut in_host: Vec<u32> = vec![0; LEN];
    let mut out_host: Vec<u32> = vec![0; LEN];

    for i in 0..LEN {
        in_host[i] = i as u32;
    }

    // preparing gpu side buffers
    let mut input = DeviceMemory::<u32>::new(LEN)?;
    let output = DeviceMemory::<u32>::new(LEN)?;

    input.copy_from_host(&in_host)?;

    // providing arguments for kernel
    let kernel_args = [input.as_kernel_arg(), output.as_kernel_arg()];

    // setting up launch args
    let grid_dim = Dim3 { x: 2, y: 1, z: 1 };
    let block_dim = Dim3 {
        x: (LEN / 2) as u32,
        y: 1,
        z: 1,
    };

    function.launch(grid_dim, block_dim, 0, None, &mut kernel_args.clone())?;

    // retriving computed data
    output.copy_to_host(&mut out_host)?;

    println!("Output: {:?}", &out_host[..256]);

    Ok(())
}

Using rocFFT with safe wrappers:

use rocm_rs::rocfft::{self, plan, execution, field};

fn main() {
    // Initialize the rocFFT library
    // Use the safe wrappers for rocFFT
    let plan = plan::Plan::new(/* parameters */);
    let field = field::Field::new(/* parameters */);
    let execution = execution::Execution::new(/* parameters */);
    
    // Perform FFT operations
    // ...
}

Using other libraries with raw bindings:

use rocm_rs::hip::*;

fn main() {
    unsafe {
        // Example of using HIP raw bindings
        let mut device_count = 0;
        hipGetDeviceCount(&mut device_count);
        println!("Found {} HIP devices", device_count);
        
        // Use other raw bindings as needed
        // ...
    }
}

Building from Source

Important: When building from source, you need to run cargo build first to generate the bindings files before you can use the library or run tests.

# Clone the repository
git clone https://github.com/RustNSparks/rocm-rs
cd rocm-rs

# Set the ROCm path if not in the default location
export ROCM_PATH=/opt/rocm

# Build the project (generates bindings)
cargo build

Feature flags

• rocm_smi - enables bindings and wrappers for rocm_smi_lib

Examples

• hip
  • vector_add - example containing kernel written in cpp launched with rocm-rs
  • rust_kernel - example containing kernel written in in rust using macros
  • rust_kernel_async - example containing kernel written in in rust, using stream to manage memory asynchronously
  • saxpy - X = aX+Y
• rand
  • normal - generating random numbers with normal distribution

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

When contributing:

1. Run cargo build first to generate the bindings
2. Add tests for new functionality
3. Update documentation as needed

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• AMD for developing and maintaining ROCm
• The Rust community for bindgen and other tools used in this project