systemd unit file to fix uvm

Former-commit-id: b82fd0f8

roles/systemd-nvidia-uvm/files/check-dev-uvm.sh

+#!/bin/bash
+echo "Checking nvidia devices"
+if [ -f /dev/nvidia-uvm ]; then
+    echo "Device created"
+else
+    echo "Device not created"
+fi

roles/systemd-nvidia-uvm/files/create-dev-uvm.service

+[Unit]
+Description=Check Nvidia UVM devices
+After=lustre-client.service
+Wants=lustre-client.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/create-dev-uvm.sh
+RemainAfterExit=true
+ExecStop=/usr/local/sbin/check-dev-uvm.sh
+StandardOutput=journal
+
+[Install]
+WantedBy=multi-user.target

roles/systemd-nvidia-uvm/files/create-dev-uvm.sh

+#!/bin/bash
+# This script is intended to be run via systemd during startup of visnodes to create NVidia UVM Devices
+
+LDFLAGS="-L/usr/local/cuda/8.0.61/lib64/stubs -L/usr/lib64 -L/usr/local/cuda/8.0.61/lib64 -L/usr/local/cuda/8.0.61/lib" /usr/local/cuda/8.0.61/samples/1_Utilities/deviceQuery/deviceQuery
+
+/bin/nvidia-modprobe -u
+
+if [ ! -e /dev/nvidia-uvm ]; then
+  # Find out the major device number used by the nvidia-uvm driver
+  D=`grep nvidia-uvm /proc/devices | awk '{print $1}'`
+
+  mknod -m 666 /dev/nvidia-uvm c $D 0
+else
+  exit 0
+fi

roles/systemd-nvidia-uvm/tasks/main.yml

+---
+- name: Copy Files
+  become: true
+  become_user: root
+  copy:
+   src: "{{ item.src }}"
+   dest: "{{ item.dest }}"
+   owner: root
+   mode: 755
+  with_items:
+   - { src: 'create-dev-uvm.sh', dest: '/usr/local/sbin/' }
+   - { src: 'check-dev-uvm.sh', dest: '/usr/local/sbin/' }
+   - { src: 'create-dev-uvm.service', dest: '/etc/systemd/system/' }
+
+- name: Enable Service
+  become: true
+  become_user: root
+  systemd: enabled=yes state=started name=create-dev-uvm