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Code Issues Releases Wiki Activity

cpupower: Add support for amd_pstate mode change

Browse source 
amd_pstate supports changing of its mode dynamically via `status` sysfs
file. Add the same capability in cpupower. To change the mode to active
mode use below command:

cpupower set --amd-pstate-mode active

Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
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>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Wyes Karny 2023-06-19 19:05:02 +00:00 committed by Shuah Khan
parent f2ab555711
commit df8776b036
3 changed files with 43 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
tools/power/cpupower/utils/cpupower-set.c
View file

@ -19,6 +19,7 @@
static struct option set_opts[] = {
{"perf-bias", required_argument, NULL, 'b'},
{"epp", required_argument, NULL, 'e'},
{"amd-pstate-mode", required_argument, NULL, 'm'},
{ },
};
@ -39,12 +40,13 @@ int cmd_set(int argc, char **argv)
struct {
int perf_bias:1;
int epp:1;
int mode:1;
};
int params;
} params;
int perf_bias = 0;
int ret = 0;
char epp[30];
char epp[30], mode[20];
ret = uname(&uts);
if (!ret && (!strcmp(uts.machine, "ppc64le") ||
@ -58,7 +60,7 @@ int cmd_set(int argc, char **argv)
params.params = 0;
/* parameter parsing */
while ((ret = getopt_long(argc, argv, "b:e:",
while ((ret = getopt_long(argc, argv, "b:e:m:",
set_opts, NULL)) != -1) {
switch (ret) {
case 'b':
@ -81,6 +83,17 @@ int cmd_set(int argc, char **argv)
}
params.epp = 1;
break;
case 'm':
if (cpupower_cpu_info.vendor != X86_VENDOR_AMD)
print_wrong_arg_exit();
if (params.mode)
print_wrong_arg_exit();
if (sscanf(optarg, "%19s", mode) != 1) {
print_wrong_arg_exit();
return -EINVAL;
}
params.mode = 1;
break;
default:
print_wrong_arg_exit();
}
@ -89,6 +102,12 @@ int cmd_set(int argc, char **argv)
if (!params.params)
print_wrong_arg_exit();
if (params.mode) {
ret = cpupower_set_amd_pstate_mode(mode);
if (ret)
fprintf(stderr, "Error setting mode\n");
}
/* Default is: set all CPUs */
if (bitmask_isallclear(cpus_chosen))
bitmask_setall(cpus_chosen);
@ -123,6 +142,7 @@ int cmd_set(int argc, char **argv)
break;
}
}
}
return ret;
}

3
tools/power/cpupower/utils/helpers/helpers.h
View file

@ -117,6 +117,7 @@ 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);
extern int cpupower_set_amd_pstate_mode(char *mode);
/* Read/Write msr ****************************/
@ -177,6 +178,8 @@ static inline unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
static inline int cpupower_set_epp(unsigned int cpu, char *epp)
{ return -1; };
static inline int cpupower_set_amd_pstate_mode(char *mode)
{ return -1; };
/* Read/Write msr ****************************/

18
tools/power/cpupower/utils/helpers/misc.c
View file

@ -106,6 +106,24 @@ int cpupower_set_epp(unsigned int cpu, char *epp)
return 0;
}
int cpupower_set_amd_pstate_mode(char *mode)
{
char path[SYSFS_PATH_MAX];
char linebuf[20] = {};
snprintf(path, sizeof(path), PATH_TO_CPU "amd_pstate/status");
if (!is_valid_path(path))
return -1;
snprintf(linebuf, sizeof(linebuf), "%s\n", mode);
if (cpupower_write_sysfs(path, linebuf, 20) <= 0)
return -1;
return 0;
}
bool cpupower_amd_pstate_enabled(void)
{
char *driver = cpufreq_get_driver(0);