linux - permision denied when change gpu clock rate in TX1 -

i have nvidia tx1 development kit i've installed ubuntu 16.04 using jetpack-l4t-3.1-linux-x64.run (in full installation mode) on it. installation procedure based on following link: " http://docs.nvidia.com/jetpack-l4t/2_1/content/developertools/mobile/jetpack/jetpack_l4t/2.0/jetpack_l4t_install.htm "

i wanted test gpu performance our application since clock set minimum value 76800000 hz. can't enough performance out of it. i've read in link: " changing gpu clock rate on linux system (nvidia jetson tx1) " change value of gpu clock rate, permission denied happens linux! there hope changing clock speed of gpu on board ?

it worth mentioning instead of having path changing clock rate /sys/kernel/debug/clock/override.gbus/rate have path: /sys/kernel/debug/clk/override.gbus/clk_rate

so can see don't have clock folder or rate file ! can see different options gpu clock rate in file: /sys/kernel/debug/clk/gbus/clk_possible_rates

thanks

the solution should not in path changing clock.

just run following bash file sudo.

#!/bin/bash # copyright (c) 2015-2017, nvidia corporation. rights reserved. # # redistribution , use in source , binary forms, or without # modification, permitted provided following conditions # met: #  * redistributions of source code must retain above copyright #    notice, list of conditions , following disclaimer. #  * redistributions in binary form must reproduce above copyright #    notice, list of conditions , following disclaimer in #    documentation and/or other materials provided distribution. #  * neither name of nvidia corporation nor names of #    contributors may used endorse or promote products derived #    software without specific prior written permission. # # software provided copyright holders ``as is'' , # express or implied warranties, including, not limited to, # implied warranties of merchantability , fitness particular # purpose disclaimed.  in no event shall copyright owner or # contributors liable direct, indirect, incidental, special, # exemplary, or consequential damages (including, not limited to, # procurement of substitute goods or services; loss of use, data, or # profits; or business interruption) caused , on theory # of liability, whether in contract, strict liability, or tort # (including negligence or otherwise) arising in way out of use # of software, if advised of possibility of such damage.  conf_file=${home}/l4t_dfs.conf red='\e[0;31m' green='\e[0;32m' blue='\e[0;34m' bred='\e[1;31m' bgreen='\e[1;32m' bblue='\e[1;34m' nc='\e[0m' # no color  usage() {     if [ "$1" != "" ];         echo -e ${red}"$1"${nc}     fi          cat >& 2 <<eof maximize jetson performance setting static max frequency cpu, gpu , emc clocks. usage: jetson_clocks.sh [options]   options,   --show             display current settings   --store [file]     store current settings file (default: \${home}/l4t_dfs.conf)   --restore [file]   restore saved settings file (default: \${home}/l4t_dfs.conf)   run jetson_clocks.sh without option set static max frequency cpu, gpu , emc clocks. eof      exit 0 }  restore() {     conf in `cat "${conf_file}"`;         file=`echo $conf | cut -f1 -d :`         data=`echo $conf | cut -f2 -d :`         case "${file}" in             /sys/devices/system/cpu/cpu*/online |\             /sys/kernel/debug/clk/override*/state)                 if [ `cat $file` -ne $data ];                     echo "${data}" > "${file}"                 fi                 ;;             /sys/devices/system/cpu/cpu*/cpufreq/scaling_min_freq |\             /sys/kernel/debug/tegra_cpufreq/*_cluster/cc3/enable)                 echo "${data}" > "${file}" 2>/dev/null                 ;;             *)                 echo "${data}" > "${file}"                 ret=$?                 if [ ${ret} -ne 0 ];                     echo "error: failed restore $file"                 fi                 ;;         esac     done }  store() {     file in $@;         if [ -e "${file}" ];             echo "${file}:`cat ${file}`" >> "${conf_file}"         fi     done }  do_fan() {     # jetson-tk1 cpu fan on.     if [ "${machine}" = "jetson-tk1" ] ;             return     fi      if [ ! -w /sys/kernel/debug/tegra_fan/target_pwm ];         echo "can't access fan!"         return     fi      case "${action}" in         show)             echo "fan: speed=`cat /sys/kernel/debug/tegra_fan/target_pwm`"             ;;         store)             store "/sys/kernel/debug/tegra_fan/target_pwm"             ;;         *)             fan_speed=255             echo "${fan_speed}" > /sys/kernel/debug/tegra_fan/target_pwm             ;;     esac }  do_clusterswitch() {     case "${action}" in         show)             if [ -d "/sys/kernel/cluster" ];                 active_cluster=`cat /sys/kernel/cluster/active`                 echo "cpu cluster switching: active cluster ${active_cluster}"             else                 echo "cpu cluster switching: disabled"             fi             ;;         store)             if [ -d "/sys/kernel/cluster" ];                 store "/sys/kernel/cluster/immediate"                 store "/sys/kernel/cluster/force"                 store "/sys/kernel/cluster/active"             fi             ;;         *)             if [ -d "/sys/kernel/cluster" ];                 echo 1 > /sys/kernel/cluster/immediate                 echo 0 > /sys/kernel/cluster/force                 echo g > /sys/kernel/cluster/active             fi             ;;     esac }  do_hotplug() {     case "${action}" in         show)             echo "online cpus: `cat /sys/devices/system/cpu/online`"             ;;         store)             file in /sys/devices/system/cpu/cpu[0-9]/online;                 store "${file}"             done             ;;         *)             if [ "${socfamily}" != "tegra186" ];                 file in /sys/devices/system/cpu/cpu*/online;                     if [ `cat $file` -eq 0 ];                         echo 1 > "${file}"                     fi                 done             fi     esac }  do_cpu() {     freq_governor="cpufreq/scaling_governor"     cpu_min_freq="cpufreq/scaling_min_freq"     cpu_max_freq="cpufreq/scaling_max_freq"     cpu_cur_freq="cpufreq/scaling_cur_freq"     cpu_set_speed="cpufreq/scaling_setspeed"     interactive_settings="/sys/devices/system/cpu/cpufreq/interactive"     schedutil_settings="/sys/devices/system/cpu/cpufreq/schedutil"      case "${action}" in         show)             folder in /sys/devices/system/cpu/cpu[0-9];                 cpu=`basename ${folder}`                 if [ -e "${folder}/${freq_governor}" ];                     echo "$cpu: gonvernor=`cat ${folder}/${freq_governor}`" \                         "minfreq=`cat ${folder}/${cpu_min_freq}`" \                         "maxfreq=`cat ${folder}/${cpu_max_freq}`" \                         "currentfreq=`cat ${folder}/${cpu_cur_freq}`"                 fi             done             ;;         store)             store "/sys/module/qos/parameters/enable"              file in \                 /sys/devices/system/cpu/cpu[0-9]/cpufreq/scaling_min_freq;                 store "${file}"             done              if [ "${socfamily}" = "tegra186" ];                 store "/sys/kernel/debug/tegra_cpufreq/m_cluster/cc3/enable"                 store "/sys/kernel/debug/tegra_cpufreq/b_cluster/cc3/enable"             fi             ;;         *)             echo 0 > /sys/module/qos/parameters/enable              if [ "${socfamily}" = "tegra186" ];                 echo 0 > /sys/kernel/debug/tegra_cpufreq/m_cluster/cc3/enable 2>/dev/null                 echo 0 > /sys/kernel/debug/tegra_cpufreq/b_cluster/cc3/enable 2>/dev/null             fi              folder in /sys/devices/system/cpu/cpu[0-9];                 cat "${folder}/${cpu_max_freq}" > "${folder}/${cpu_min_freq}" 2>/dev/null             done             ;;     esac }  do_gpu() {     case "${socfamily}" in         tegra186)             gpu_min_freq="/sys/devices/17000000.gp10b/devfreq/17000000.gp10b/min_freq"             gpu_max_freq="/sys/devices/17000000.gp10b/devfreq/17000000.gp10b/max_freq"             gpu_cur_freq="/sys/devices/17000000.gp10b/devfreq/17000000.gp10b/cur_freq"             gpu_rail_gate="/sys/devices/17000000.gp10b/railgate_enable"             ;;         tegra210)             gpu_min_freq="/sys/devices/57000000.gpu/devfreq/57000000.gpu/min_freq"             gpu_max_freq="/sys/devices/57000000.gpu/devfreq/57000000.gpu/max_freq"             gpu_cur_freq="/sys/devices/57000000.gpu/devfreq/57000000.gpu/cur_freq"             gpu_rail_gate="/sys/devices/57000000.gpu/railgate_enable"             ;;         *)             echo "error! unsupported soc ${socfamily}"             exit 1;             ;;     esac      case "${action}" in         show)             echo "gpu minfreq=`cat ${gpu_min_freq}`" \                 "maxfreq=`cat ${gpu_max_freq}`" \                 "currentfreq=`cat ${gpu_cur_freq}`"             ;;         store)             store "${gpu_min_freq}"             store "${gpu_rail_gate}"             ;;         *)             echo 0 > "${gpu_rail_gate}"             cat "${gpu_max_freq}" > "${gpu_min_freq}"             ret=$?             if [ ${ret} -ne 0 ];                 echo "error: failed max gpu frequency!"             fi             ;;     esac }  do_emc() {     case "${socfamily}" in         tegra186)             emc_iso_cap="/sys/kernel/nvpmodel_emc_cap/emc_iso_cap"             emc_min_freq="/sys/kernel/debug/bpmp/debug/clk/emc/min_rate"             emc_max_freq="/sys/kernel/debug/bpmp/debug/clk/emc/max_rate"             emc_cur_freq="/sys/kernel/debug/clk/emc/clk_rate"             emc_update_freq="/sys/kernel/debug/bpmp/debug/clk/emc/rate"             emc_freq_override="/sys/kernel/debug/bpmp/debug/clk/emc/mrq_rate_locked"             ;;         tegra210)             emc_min_freq="/sys/kernel/debug/tegra_bwmgr/emc_min_rate"             emc_max_freq="/sys/kernel/debug/tegra_bwmgr/emc_max_rate"             emc_cur_freq="/sys/kernel/debug/clk/override.emc/clk_rate"             emc_update_freq="/sys/kernel/debug/clk/override.emc/clk_update_rate"             emc_freq_override="/sys/kernel/debug/clk/override.emc/clk_state"             ;;         *)             echo "error! unsupported soc ${socfamily}"             exit 1;             ;;      esac     case "${action}" in         show)             echo "emc minfreq=`cat ${emc_min_freq}`" \                 "maxfreq=`cat ${emc_max_freq}`" \                 "currentfreq=`cat ${emc_cur_freq}`" \                 "freqoverride=`cat ${emc_freq_override}`"             ;;         store)             store "${emc_freq_override}"             ;;         *)             if [ "${socfamily}" = "tegra186" ];                 emc_cap=`cat "${emc_iso_cap}"`                 if [ "$emc_cap" -eq 0 ];                     cat "${emc_max_freq}" > "${emc_update_freq}"                 else                     echo "$emc_cap" >  "${emc_update_freq}"                 fi             else                 cat "${emc_max_freq}" > "${emc_update_freq}"             fi              echo 1 > "${emc_freq_override}"             ;;     esac }  main () {     while [ -n "$1" ];         case "$1" in             --show)                 echo "soc family:${socfamily}  machine:${machine}"                 action=show                 ;;             --store)                 [ -n "$2" ] && conf_file=$2                 action=store                 shift 1                 ;;             --restore)                 [ -n "$2" ] && conf_file=$2                 action=restore                 shift 1                 ;;             -h|--help)                 usage                 exit 0                 ;;             *)                 usage "unknown option: $1"                 exit 1                 ;;         esac         shift 1     done      [ `whoami` != root ] && \         echo error: run script\($0\) root user && exit 1      case $action in         store)             if [ -e "${conf_file}" ];                 echo "file $conf_file exists. can overwrite it? y/n:"                 read answer                 case $answer in                     y|y)                         rm -f $conf_file                         ;;                     *)                         echo "error: file $conf_file exists!"                         exit 1                         ;;                 esac             fi             ;;         restore)             if [ ! -e "${conf_file}" ];                 echo "error: $conf_file file not found !"                 exit 1             fi             restore             exit 0             ;;     esac      do_hotplug     do_clusterswitch     do_cpu     do_gpu     do_emc #   do_fan }   if [ -e "/sys/devices/soc0/family" ];     socfamily="`cat /sys/devices/soc0/family`"     if [ -e "/sys/devices/soc0/machine" ];         machine=`cat /sys/devices/soc0/machine`     fi elif [ -e "/proc/device-tree/compatible" ];     grep "nvidia,tegra210" /proc/device-tree/compatible &>/dev/null     if [ $? -eq 0 ];         socfamily="tegra210"     else         grep "nvidia,tegra186" /proc/device-tree/compatible &>/dev/null         if [ $? -eq 0 ];             socfamily="tegra186"         fi     fi      if [ -e "/proc/device-tree/model" ];         machine="`cat /proc/device-tree/model`"     fi fi  main $@ exit 0