intelctl.sh

#!/bin/bash

if [[ $# -eq 0 ]]; then
  echo "Usage:"
  echo " intelctl max <max>        - Sets max CPU percentage."
  echo " intelctl min <min>        - Sets min CPU percentage."
  echo " intelctl both <min> <max> - Sets both limits."
  echo " intelctl turbo <on|off>   - Enables/Disables turbo."
  echo " intelctl status           - Shows status."
  exit 0
fi

CONTROL_PATH="/sys/devices/system/cpu/intel_pstate"
MAX_PATH="$CONTROL_PATH/max_perf_pct"
MIN_PATH="$CONTROL_PATH/min_perf_pct"
NO_TURBO_PATH="$CONTROL_PATH/no_turbo"

function showStatus {
  MAX=$(cat "$MAX_PATH")
  MIN=$(cat "$MIN_PATH")
  NO_TURBO_RAW=$(cat $NO_TURBO_PATH)
  TURBO_TEXT="on"
  if [[ $NO_TURBO_RAW -eq 1 ]]; then
    TURBO_TEXT="off"
  fi
  
  echo "intelctl: CPU State limits: $MIN < actual < $MAX (Turbo $TURBO_TEXT)"
}

function requireArgs {
  if [[ $# -eq $1 ]]; then
    echo "intelctl: Need exactly $1 parameters. Try just intelctl for usage."
    exit 1
  fi
}

function setDirectly {
  if [[ $UID -ne 0 ]]; then
    echo "intelctl: Cannot set $3 when not root!"
  else
    echo $1 >$2
    echo "intelctl: Set $3 to $1."
  fi
}

function parseTurboValue {
  # returns the value for no_turbo, aka the opposite of the argument
  case $1 in
  on)
    echo "0"
    ;;
  off)
    echo "1"
    ;;
  *)
    echo "intelctl: Invalid turbo value: $1"
    echo "intelctl: Allowed values: [on, off]"
    exit 1
    ;;
  esac
}

case $1 in
max)
  requireArgs 2
  setDirectly $2 $MAX_PATH "upper bound"
  showStatus
  ;;
min)
  requireArgs 2
  setDirectly $2 $MIN_PATH "lower bound"
  showStatus
  ;;
both)
  requireArgs 3
  setDirectly $2 $MIN_PATH "lower bound"
  setDirectly $3 $MAX_PATH "upper bound"
  showStatus
  ;;
turbo)
  requireArgs 2
  NO_TURBO_VAL=$(parseTurboValue $2)
  setDirectly $NO_TURBO_VAL $NO_TURBO_PATH "no_turbo"
  showStatus
  ;;
status)
  showStatus
  ;;
*)
  echo "Unknown action $1. Try just intelctl for usage."
  ;;
esac