linux-kernel - Re: [PATCH v2 5/5] cpupower: Add turbo-boost support in cpupower

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Date:   Sun, 18 Jun 2023 20:59:57 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Wyes Karny <wyes.karny@....com>, trenn@...e.com, shuah@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        rafael@...nel.org, gautham.shenoy@....com, Ray.Huang@....com,
        Perry.Yuan@....com
Subject: Re: [PATCH v2 5/5] cpupower: Add turbo-boost support in cpupower

On 6/16/23 07:11, Wyes Karny wrote:
> If boost sysfs (/sys/devices/system/cpu/cpufreq/boost) file is present
> turbo-boost is feature is supported in the hardware. By default this
> feature should be enabled. But to disable/enable it write to the sysfs
> file. Use the same to control this feature via cpupower.
> 
> To enable:
> cpupower set --turbo-boost 1
> 
> To disable:
> cpupower set --turbo-boost 0
> 
> Acked-by: Huang Rui <ray.huang@....com>
> Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
> Signed-off-by: Wyes Karny <wyes.karny@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>

> ---
>   tools/power/cpupower/utils/cpupower-set.c    | 22 +++++++++++++++++++-
>   tools/power/cpupower/utils/helpers/helpers.h |  3 +++
>   tools/power/cpupower/utils/helpers/misc.c    | 18 ++++++++++++++++
>   3 files changed, 42 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/power/cpupower/utils/cpupower-set.c b/tools/power/cpupower/utils/cpupower-set.c
> index c2ba69b7ea54..0677b58374ab 100644
> --- a/tools/power/cpupower/utils/cpupower-set.c
> +++ b/tools/power/cpupower/utils/cpupower-set.c
> @@ -20,6 +20,7 @@ static struct option set_opts[] = {
>   	{"perf-bias", required_argument, NULL, 'b'},
>   	{"epp", required_argument, NULL, 'e'},
>   	{"amd-pstate-mode", required_argument, NULL, 'm'},
> +	{"turbo-boost", required_argument, NULL, 't'},
>   	{ },
>   };
>   
> @@ -41,10 +42,11 @@ int cmd_set(int argc, char **argv)
>   			int perf_bias:1;
>   			int epp:1;
>   			int mode:1;
> +			int turbo_boost:1;
>   		};
>   		int params;
>   	} params;
> -	int perf_bias = 0;
> +	int perf_bias = 0, turbo_boost = 1;
>   	int ret = 0;
>   	char epp[30], mode[20];
>   
> @@ -94,6 +96,18 @@ int cmd_set(int argc, char **argv)
>   			}
>   			params.mode = 1;
>   			break;
> +		case 't':
> +			if (params.turbo_boost)
> +				print_wrong_arg_exit();
> +			turbo_boost = atoi(optarg);
> +			if (turbo_boost < 0 || turbo_boost > 1) {
> +				printf("--turbo-boost param out of range [0-1]\n");
> +				print_wrong_arg_exit();
> +			}
> +			params.turbo_boost = 1;
> +			break;
> +
> +
>   		default:
>   			print_wrong_arg_exit();
>   		}
> @@ -108,6 +122,12 @@ int cmd_set(int argc, char **argv)
>   			fprintf(stderr, "Error setting mode\n");
>   	}
>   
> +	if (params.turbo_boost) {
> +		ret = cpupower_set_turbo_boost(turbo_boost);
> +		if (ret)
> +			fprintf(stderr, "Error setting turbo-boost\n");
> +	}
> +
>   	/* Default is: set all CPUs */
>   	if (bitmask_isallclear(cpus_chosen))
>   		bitmask_setall(cpus_chosen);
> diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
> index d35596631eef..95749b8ee475 100644
> --- a/tools/power/cpupower/utils/helpers/helpers.h
> +++ b/tools/power/cpupower/utils/helpers/helpers.h
> @@ -118,6 +118,7 @@ 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);
> +extern int cpupower_set_turbo_boost(int turbo_boost);
>   
>   /* Read/Write msr ****************************/
>   
> @@ -180,6 +181,8 @@ 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; };
> +static inline int cpupower_set_turbo_boost(int turbo_boost)
> +{ return -1; };
>   
>   /* Read/Write msr ****************************/
>   
> diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
> index 9df9af8a969e..fc822a0e6b7b 100644
> --- a/tools/power/cpupower/utils/helpers/misc.c
> +++ b/tools/power/cpupower/utils/helpers/misc.c
> @@ -124,6 +124,24 @@ int cpupower_set_amd_pstate_mode(char *mode)
>   	return 0;
>   }
>   
> +int cpupower_set_turbo_boost(int turbo_boost)
> +{
> +	char path[SYSFS_PATH_MAX];
> +	char linebuf[2] = {};
> +
> +	snprintf(path, sizeof(path), PATH_TO_CPU "cpufreq/boost");
> +
> +	if (!is_valid_path(path))
> +		return -1;
> +
> +	snprintf(linebuf, sizeof(linebuf), "%d", turbo_boost);
> +
> +	if (cpupower_write_sysfs(path, linebuf, 2) <= 0)
> +		return -1;
> +
> +	return 0;
> +}
> +
>   bool cpupower_amd_pstate_enabled(void)
>   {
>   	char *driver = cpufreq_get_driver(0);