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cpupower: Add support for showing energy performance preference

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The EPP value is useful for characterization of performance. Show
it in cpupower frequency-info output.

Link: https://lore.kernel.org/r/20241218191144.3440854-6-superm1@kernel.org
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Mario Limonciello 2024-12-18 13:09:54 -06:00 committed by Shuah Khan
parent 26e16174f5
commit 5f567afc28
3 changed files with 46 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
tools/power/cpupower/lib/cpufreq.c
View File

@ -127,12 +127,14 @@ static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu,
enum cpufreq_string {
SCALING_DRIVER,
SCALING_GOVERNOR,
ENERGY_PERFORMANCE_PREFERENCE,
MAX_CPUFREQ_STRING_FILES
};
static const char *cpufreq_string_files[MAX_CPUFREQ_STRING_FILES] = {
[SCALING_DRIVER] = "scaling_driver",
[SCALING_GOVERNOR] = "scaling_governor",
[ENERGY_PERFORMANCE_PREFERENCE] = "energy_performance_preference",
};
@ -207,6 +209,18 @@ unsigned long cpufreq_get_transition_latency(unsigned int cpu)
return sysfs_cpufreq_get_one_value(cpu, CPUINFO_LATENCY);
}
char *cpufreq_get_energy_performance_preference(unsigned int cpu)
{
return sysfs_cpufreq_get_one_string(cpu, ENERGY_PERFORMANCE_PREFERENCE);
}
void cpufreq_put_energy_performance_preference(char *ptr)
{
if (!ptr)
return;
free(ptr);
}
int cpufreq_get_hardware_limits(unsigned int cpu,
unsigned long *min,
unsigned long *max)

8
tools/power/cpupower/lib/cpufreq.h
View File

@ -68,6 +68,14 @@ unsigned long cpufreq_get_freq_hardware(unsigned int cpu);
unsigned long cpufreq_get_transition_latency(unsigned int cpu);
/* determine energy performance preference
*
* returns NULL on failure, else the string that represents the energy performance
* preference requested.
*/
char *cpufreq_get_energy_performance_preference(unsigned int cpu);
void cpufreq_put_energy_performance_preference(char *ptr);
/* determine hardware CPU frequency limits
*
* These may be limited further by thermal, energy or other

25
tools/power/cpupower/utils/cpufreq-info.c
View File

@ -422,6 +422,23 @@ static int get_freq_stats(unsigned int cpu, unsigned int human)
return 0;
}
/* --epp / -z */
static int get_epp(unsigned int cpu, bool interactive)
{
char *epp;
epp = cpufreq_get_energy_performance_preference(cpu);
if (!epp)
return -EINVAL;
if (interactive)
printf(_(" energy performance preference: %s\n"), epp);
cpufreq_put_energy_performance_preference(epp);
return 0;
}
/* --latency / -y */
static int get_latency(unsigned int cpu, unsigned int human)
@ -461,6 +478,7 @@ static void debug_output_one(unsigned int cpu)
get_related_cpus(cpu);
get_affected_cpus(cpu);
get_latency(cpu, 1);
get_epp(cpu, true);
get_hardware_limits(cpu, 1);
freqs = cpufreq_get_available_frequencies(cpu);
@ -501,6 +519,7 @@ static struct option info_opts[] = {
{"human", no_argument, NULL, 'm'},
{"no-rounding", no_argument, NULL, 'n'},
{"performance", no_argument, NULL, 'c'},
{"epp", no_argument, NULL, 'z'},
{ },
};
@ -514,7 +533,7 @@ int cmd_freq_info(int argc, char **argv)
int output_param = 0;
do {
ret = getopt_long(argc, argv, "oefwldpgrasmybnc", info_opts,
ret = getopt_long(argc, argv, "oefwldpgrasmybncz", info_opts,
NULL);
switch (ret) {
case '?':
@ -538,6 +557,7 @@ int cmd_freq_info(int argc, char **argv)
case 's':
case 'y':
case 'c':
case 'z':
if (output_param) {
output_param = -1;
cont = 0;
@ -647,6 +667,9 @@ int cmd_freq_info(int argc, char **argv)
case 'c':
ret = get_perf_cap(cpu);
break;
case 'z':
ret = get_epp(cpu, true);
break;
}
if (ret)
return ret;