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cpupower: Add EPP value change support

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amd_pstate and intel_pstate active mode drivers support energy
performance preference feature. Through this user can convey it's
energy/performance preference to platform. Add this value change
capability to cpupower.

To change the EPP value use below command:
cpupower set --epp performance

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
Tested-by: Perry Yuan <Perry.Yuan@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Wyes Karny 2023-06-19 19:05:01 +00:00 committed by Shuah Khan
parent 1ce5ab7c1d
commit f2ab555711
3 changed files with 46 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
tools/power/cpupower/utils/cpupower-set.c
View File

@ -18,6 +18,7 @@
static struct option set_opts[] = {
{"perf-bias", required_argument, NULL, 'b'},
{"epp", required_argument, NULL, 'e'},
{ },
};
@ -37,11 +38,13 @@ int cmd_set(int argc, char **argv)
union {
struct {
int perf_bias:1;
int epp:1;
};
int params;
} params;
int perf_bias = 0;
int ret = 0;
char epp[30];
ret = uname(&uts);
if (!ret && (!strcmp(uts.machine, "ppc64le") ||
@ -55,7 +58,7 @@ int cmd_set(int argc, char **argv)
params.params = 0;
/* parameter parsing */
while ((ret = getopt_long(argc, argv, "b:",
while ((ret = getopt_long(argc, argv, "b:e:",
set_opts, NULL)) != -1) {
switch (ret) {
case 'b':
@ -69,6 +72,15 @@ int cmd_set(int argc, char **argv)
}
params.perf_bias = 1;
break;
case 'e':
if (params.epp)
print_wrong_arg_exit();
if (sscanf(optarg, "%29s", epp) != 1) {
print_wrong_arg_exit();
return -EINVAL;
}
params.epp = 1;
break;
default:
print_wrong_arg_exit();
}
@ -102,6 +114,15 @@ int cmd_set(int argc, char **argv)
break;
}
}
if (params.epp) {
ret = cpupower_set_epp(cpu, epp);
if (ret) {
fprintf(stderr,
"Error setting epp value on CPU %d\n", cpu);
break;
}
}
}
return ret;
}

5
tools/power/cpupower/utils/helpers/helpers.h
View File

@ -116,6 +116,8 @@ extern int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val);
extern int cpupower_intel_get_perf_bias(unsigned int cpu);
extern unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu);
extern int cpupower_set_epp(unsigned int cpu, char *epp);
/* Read/Write msr ****************************/
/* PCI stuff ****************************/
@ -173,6 +175,9 @@ static inline int cpupower_intel_get_perf_bias(unsigned int cpu)
static inline unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
{ return 0; };
static inline int cpupower_set_epp(unsigned int cpu, char *epp)
{ return -1; };
/* Read/Write msr ****************************/
static inline int cpufreq_has_boost_support(unsigned int cpu, int *support,

19
tools/power/cpupower/utils/helpers/misc.c
View File

@ -87,6 +87,25 @@ int cpupower_intel_set_perf_bias(unsigned int cpu, unsigned int val)
return 0;
}
int cpupower_set_epp(unsigned int cpu, char *epp)
{
char path[SYSFS_PATH_MAX];
char linebuf[30] = {};
snprintf(path, sizeof(path),
PATH_TO_CPU "cpu%u/cpufreq/energy_performance_preference", cpu);
if (!is_valid_path(path))
return -1;
snprintf(linebuf, sizeof(linebuf), "%s", epp);
if (cpupower_write_sysfs(path, linebuf, 30) <= 0)
return -1;
return 0;
}
bool cpupower_amd_pstate_enabled(void)
{
char *driver = cpufreq_get_driver(0);