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Message-ID: <CYYPR12MB86552B06E656F3C4F28C05659C5CA@CYYPR12MB8655.namprd12.prod.outlook.com>
Date: Tue, 20 Jun 2023 03:08:30 +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>, "Huang, Ray" <Ray.Huang@....com>,
"Limonciello, Mario" <Mario.Limonciello@....com>
Subject: RE: [PATCH v3 4/5] cpupower: Add support for amd_pstate mode change
[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>; Huang,
> Ray <Ray.Huang@....com>; Limonciello, Mario
> <Mario.Limonciello@....com>
> Subject: [PATCH v3 4/5] cpupower: Add support for amd_pstate mode change
>
> 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@....com>
> Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> Signed-off-by: Wyes Karny <wyes.karny@....com>
> ---
> tools/power/cpupower/utils/cpupower-set.c | 24 ++++++++++++++++++--
> tools/power/cpupower/utils/helpers/helpers.h | 3 +++
> tools/power/cpupower/utils/helpers/misc.c | 18 +++++++++++++++
> 3 files changed, 43 insertions(+), 2 deletions(-)
>
> diff --git a/tools/power/cpupower/utils/cpupower-set.c
> b/tools/power/cpupower/utils/cpupower-set.c
> index a789b123dbd4..c2ba69b7ea54 100644
> --- a/tools/power/cpupower/utils/cpupower-set.c
> +++ b/tools/power/cpupower/utils/cpupower-set.c
> @@ -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;
> }
> diff --git a/tools/power/cpupower/utils/helpers/helpers.h
> b/tools/power/cpupower/utils/helpers/helpers.h
> index 5d998de2d291..d35596631eef 100644
> --- a/tools/power/cpupower/utils/helpers/helpers.h
> +++ b/tools/power/cpupower/utils/helpers/helpers.h
> @@ -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 ****************************/
>
> diff --git a/tools/power/cpupower/utils/helpers/misc.c
> b/tools/power/cpupower/utils/helpers/misc.c
> index 583df38ab13c..075c136a100c 100644
> --- a/tools/power/cpupower/utils/helpers/misc.c
> +++ b/tools/power/cpupower/utils/helpers/misc.c
> @@ -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);
> --
> 2.34.1
Tested-by: Perry Yuan <Perry.Yuan@....com>
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