linux-kernel - Re: [PATCH Resend 5/8] tools/power x86_energy_perf_policy: add nominal and lowest nonlinear perf values showing support

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Date: Tue, 30 Jan 2024 13:56:18 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Perry Yuan <perry.yuan@....com>, rafael.j.wysocki@...el.com,
 Borislav.Petkov@....com, viresh.kumar@...aro.org, Ray.Huang@....com,
 gautham.shenoy@....com
Cc: Alexander.Deucher@....com, Xinmei.Huang@....com, Xiaojian.Du@....com,
 Li.Meng@....com, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH Resend 5/8] tools/power x86_energy_perf_policy: add
 nominal and lowest nonlinear perf values showing support

On 1/29/2024 23:56, Perry Yuan wrote:
> Add nominal_perf and lowest_nonlinear_perf read and print the values. It
> will help user to check each core all perf values of CPPC and change the
> EPP profile as need.
> 
> cpu0: [AMD HWP_CAP]: low 12 lowest_non 86 nominal 121 highest 196
> cpu1: [AMD HWP_CAP]: low 12 lowest_non 86 nominal 121 highest 176
> cpu2: [AMD HWP_CAP]: low 12 lowest_non 86 nominal 121 highest 201
> cpu3: [AMD HWP_CAP]: low 12 lowest_non 86 nominal 121 highest 181
> 
> Signed-off-by: Perry Yuan <perry.yuan@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   .../x86_energy_perf_policy/x86_energy_perf_policy.c | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
> index a08403ab219a..7bc668d22728 100644
> --- a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
> +++ b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
> @@ -38,6 +38,8 @@ struct msr_hwp_cap {
>   	unsigned char guaranteed;
>   	unsigned char efficient;
>   	unsigned char lowest;
> +	unsigned char nominal_perf;
> +	unsigned char lowest_nonlinear_perf;
>   };
>   
>   struct msr_hwp_request {
> @@ -820,8 +822,13 @@ void print_hwp_cap(int cpu, struct msr_hwp_cap *cap, char *str)
>   	if (cpu != -1)
>   		printf("cpu%d: ", cpu);
>   
> -	printf("HWP_CAP: low %d eff %d guar %d high %d\n",
> -		cap->lowest, cap->efficient, cap->guaranteed, cap->highest);
> +	if (genuine_intel) {
> +		printf("HWP_CAP: low %d eff %d guar %d high %d\n",
> +			cap->lowest, cap->efficient, cap->guaranteed, cap->highest);
> +	} else if (authentic_amd) {
> +		printf("[AMD HWP_CAP]: low %d lowest_non %d nominal %d highest %d\n\n",
> +			cap->lowest, cap->lowest_nonlinear_perf, cap->nominal_perf, cap->highest);
> +	}
>   }
>   void read_hwp_cap(int cpu, struct msr_hwp_cap *cap, unsigned int msr_offset)
>   {
> @@ -840,6 +847,8 @@ void read_hwp_cap(int cpu, struct msr_hwp_cap *cap, unsigned int msr_offset)
>   			errx(-1, "failed to get msr with return %d", ret);
>   		cap->highest = msr_perf_2_ratio(AMD_CPPC_HIGHEST_PERF(msr));
>   		cap->lowest = msr_perf_2_ratio(AMD_CPPC_LOWEST_PERF(msr));
> +		cap->nominal_perf = msr_perf_2_ratio(AMD_CPPC_NOMINAL_PERF(msr));
> +		cap->lowest_nonlinear_perf = msr_perf_2_ratio(AMD_CPPC_LOWNONLIN_PERF(msr));
>   	}
>   }
>