nvidia.go

// Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.

package nvidia

import (
	"errors"
	"os"
	"os/exec"

	"github.com/NVIDIA/nvidia-docker/src/cuda"
	"github.com/NVIDIA/nvidia-docker/src/nvml"
)

const (
	DockerPlugin   = "nvidia-docker"
	DeviceCtl      = "/dev/nvidiactl"
	DeviceUVM      = "/dev/nvidia-uvm"
	DeviceUVMTools = "/dev/nvidia-uvm-tools"
)

func Init() error {
	if err := os.Setenv("CUDA_DISABLE_UNIFIED_MEMORY", "1"); err != nil {
		return err
	}
	if err := os.Setenv("CUDA_CACHE_DISABLE", "1"); err != nil {
		return err
	}
	if err := os.Unsetenv("CUDA_VISIBLE_DEVICES"); err != nil {
		return err
	}
	return nvml.Init()
}

func Shutdown() error {
	return nvml.Shutdown()
}

func LoadUVM() error {
	if exec.Command("nvidia-modprobe", "-u", "-c=0").Run() != nil {
		return errors.New("Could not load UVM kernel module. Is nvidia-modprobe installed?")
	}
	return nil
}

func GetDriverVersion() (string, error) {
	return nvml.GetDriverVersion()
}

func GetCUDAVersion() (string, error) {
	return cuda.GetDriverVersion()
}

func GetControlDevicePaths() ([]string, error) {
	devs := []string{DeviceCtl, DeviceUVM}

	_, err := os.Stat(DeviceUVMTools)
	if os.IsNotExist(err) {
		return devs, nil
	}
	return append(devs, DeviceUVMTools), err
}