Get PCI Bus ID for Nvidia GPU. Compiled and run by `nvcc -arch=sm_89 nvidia_pcibusid.cc -o nvidia_pcibusid -lcuda -run`

nvidia_pcibusid.cc

#include <iostream>
#include <cuda_runtime.h>
#include <cuda.h>

int main() {
    CUresult cuResult;
    cuInit(0);

    int deviceCount;
    cuResult = cuDeviceGetCount(&deviceCount);
    if (cuResult != CUDA_SUCCESS || deviceCount == 0) {
        std::cerr << "No CUDA-capable devices found" << std::endl;
        return 1;
    }

    for (int deviceId = 0; deviceId < deviceCount; ++deviceId) {
        CUdevice cuDevice;
        cuResult = cuDeviceGet(&cuDevice, deviceId);
        if (cuResult != CUDA_SUCCESS) {
            std::cerr << "Error getting CUDA device" << std::endl;
            return 1;
        }

        char deviceName[256];
        cuDeviceGetName(deviceName, sizeof(deviceName), cuDevice);

        char pciBusId[16];
        cuResult = cuDeviceGetPCIBusId(pciBusId, sizeof(pciBusId), cuDevice);
        if (cuResult != CUDA_SUCCESS) {
            std::cerr << "Error getting PCI Bus ID" << std::endl;
            return 1;
        }

        std::cout << "GPU Device ID: " << deviceId << std::endl;
        std::cout << "  Device Name: " << deviceName << std::endl;
        std::cout << "  PCI Bus ID: " << pciBusId << std::endl;
    }

    cuResult = cuInit(0);  // Cleanup CUDA Driver API
    if (cuResult != CUDA_SUCCESS) {
        std::cerr << "Error cleaning up CUDA Driver API" << std::endl;
        return 1;
    }

    return 0;
}