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kselftest: cpufreq: Backup and restore governor for sptests

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After executing cpufreq sptest, the system governor
will be overwritten with the governor switched
during the test. Restore this setting to maintain
consistency before and after the test.

Signed-off-by: Yiwei Lin <s921975628@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://patch.msgid.link/20260707163647.6646-1-s921975628@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Yiwei Lin
2026-07-08 00:36:47 +08:00
committed by Rafael J. Wysocki
parent 60e32ff9ed
commit 4763f0db60
2 changed files with 35 additions and 0 deletions
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21
tools/testing/selftests/cpufreq/governor.sh
View File

@@ -16,6 +16,12 @@ source cpufreq.sh
CUR_GOV=
CUR_FREQ=
# Per-policy backup, keyed by policy so multiple policies can be saved at once
# (backup_governor/restore_governor also keep CUR_GOV/CUR_FREQ for callers that
# read them directly).
declare -A SAVED_GOVERNORS
declare -A SAVED_FREQS
# Find governor's directory path
# $1: policy, $2: governor
find_gov_directory()
@@ -39,11 +45,13 @@ find_current_governor()
backup_governor()
{
CUR_GOV=$(find_current_governor $1)
SAVED_GOVERNORS[$1]=$CUR_GOV
printf "Governor backup done for $1: $CUR_GOV\n"
if [ $CUR_GOV == "userspace" ]; then
CUR_FREQ=$(find_current_freq $1)
SAVED_FREQS[$1]=$CUR_FREQ
printf "Governor frequency backup done for $1: $CUR_FREQ\n"
fi
@@ -53,11 +61,13 @@ backup_governor()
# $1: policy
restore_governor()
{
CUR_GOV=${SAVED_GOVERNORS[$1]}
__switch_governor $1 $CUR_GOV
printf "Governor restored for $1 to $CUR_GOV\n"
if [ $CUR_GOV == "userspace" ]; then
CUR_FREQ=${SAVED_FREQS[$1]}
set_cpu_frequency $1 $CUR_FREQ
printf "Governor frequency restored for $1: $CUR_FREQ\n"
fi
@@ -65,6 +75,17 @@ restore_governor()
printf "\n"
}
# Save/restore governors for every policy at once
save_all_governors()
{
for_each_policy backup_governor
}
restore_all_governors()
{
for_each_policy restore_governor
}
# param:
# $1: policy, $2: governor
__switch_governor()

14
tools/testing/selftests/cpufreq/special-tests.sh
View File

@@ -40,7 +40,9 @@ simple_lockdep()
{
printf "** Test: Running ${FUNCNAME[0]} **\n"
save_all_governors
for_each_policy __simple_lockdep
restore_all_governors
}
# Test 2
@@ -56,7 +58,10 @@ concurrent_lockdep()
{
printf "** Test: Running ${FUNCNAME[0]} **\n"
save_all_governors
for_each_policy_concurrent __concurrent_lockdep
wait
restore_all_governors
}
# Test 3
@@ -68,17 +73,23 @@ quick_shuffle()
echo ondemand | tee $CPUFREQROOT/policy*/scaling_governor &
echo userspace | tee $CPUFREQROOT/policy*/scaling_governor &
done
wait
}
governor_race()
{
printf "** Test: Running ${FUNCNAME[0]} **\n"
save_all_governors
# run 8 concurrent instances
for I in `seq 8`
do
quick_shuffle &
done
wait
restore_all_governors
}
# Test 4
@@ -112,5 +123,8 @@ hotplug_with_updates_cpu()
hotplug_with_updates()
{
save_all_governors
for_each_non_boot_cpu hotplug_with_updates_cpu
wait
restore_all_governors
}