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Date: Tue, 20 Jun 2023 03:08:46 +0000
From: "Yuan, Perry" <Perry.Yuan@....com>
To: "Karny, Wyes" <Wyes.Karny@....com>,
"trenn@...e.com" <trenn@...e.com>,
"shuah@...nel.org" <shuah@...nel.org>
CC: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"rafael@...nel.org" <rafael@...nel.org>,
"Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
"Limonciello, Mario" <Mario.Limonciello@....com>,
"Huang, Ray" <Ray.Huang@....com>,
"Limonciello, Mario" <Mario.Limonciello@....com>
Subject: RE: [PATCH v3 3/5] cpupower: Add EPP value change support
[AMD Official Use Only - General]
> -----Original Message-----
> From: Karny, Wyes <Wyes.Karny@....com>
> Sent: Tuesday, June 20, 2023 3:05 AM
> To: trenn@...e.com; shuah@...nel.org
> Cc: linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; rafael@...nel.org;
> Shenoy, Gautham Ranjal <gautham.shenoy@....com>; Limonciello, Mario
> <Mario.Limonciello@....com>; Huang, Ray <Ray.Huang@....com>; Yuan,
> Perry <Perry.Yuan@....com>; Karny, Wyes <Wyes.Karny@....com>;
> Limonciello, Mario <Mario.Limonciello@....com>
> Subject: [PATCH v3 3/5] cpupower: Add EPP value change support
>
> 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@....com>
> Signed-off-by: Wyes Karny <wyes.karny@....com>
> ---
> tools/power/cpupower/utils/cpupower-set.c | 23 +++++++++++++++++++-
> tools/power/cpupower/utils/helpers/helpers.h | 5 +++++
> tools/power/cpupower/utils/helpers/misc.c | 19 ++++++++++++++++
> 3 files changed, 46 insertions(+), 1 deletion(-)
>
> diff --git a/tools/power/cpupower/utils/cpupower-set.c
> b/tools/power/cpupower/utils/cpupower-set.c
> index 180d5ba877e6..a789b123dbd4 100644
> --- a/tools/power/cpupower/utils/cpupower-set.c
> +++ b/tools/power/cpupower/utils/cpupower-set.c
> @@ -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;
> }
> diff --git a/tools/power/cpupower/utils/helpers/helpers.h
> b/tools/power/cpupower/utils/helpers/helpers.h
> index 96e4bede078b..5d998de2d291 100644
> --- a/tools/power/cpupower/utils/helpers/helpers.h
> +++ b/tools/power/cpupower/utils/helpers/helpers.h
> @@ -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, diff
> --git a/tools/power/cpupower/utils/helpers/misc.c
> b/tools/power/cpupower/utils/helpers/misc.c
> index 0c56fc77f93b..583df38ab13c 100644
> --- a/tools/power/cpupower/utils/helpers/misc.c
> +++ b/tools/power/cpupower/utils/helpers/misc.c
> @@ -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);
> --
> 2.34.1
Tested-by: Perry Yuan <Perry.Yuan@....com>
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