linux-kernel - Re: [PATCH v3 17/21] cpupower: add amd-pstate sysfs definition and access helper

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Date:   Fri, 29 Oct 2021 09:10:13 -0500
From:   "Limonciello, Mario" <mario.limonciello@....com>
To:     Huang Rui <ray.huang@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        linux-pm@...r.kernel.org
Cc:     Deepak Sharma <deepak.sharma@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Steven Noonan <steven@...vesoftware.com>,
        Nathan Fontenot <nathan.fontenot@....com>,
        Jinzhou Su <Jinzhou.Su@....com>,
        Xiaojian Du <Xiaojian.Du@....com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v3 17/21] cpupower: add amd-pstate sysfs definition and
 access helper

On 10/29/2021 08:02, Huang Rui wrote:
> Introduce the marco definitions and access helper function for

You've got a spelling error here.

> amd-pstate sysfs interfaces such as each performance goals and frequency
> levels in amd helper file. They will be used to read the sysfs attribute
> from amd-pstate cpufreq driver for cpupower utilities.
> 
> Signed-off-by: Huang Rui <ray.huang@....com>
> ---
>   tools/power/cpupower/utils/helpers/amd.c | 37 ++++++++++++++++++++++++
>   1 file changed, 37 insertions(+)
> 
> diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c
> index 97f2c857048e..f233a6ab75ac 100644
> --- a/tools/power/cpupower/utils/helpers/amd.c
> +++ b/tools/power/cpupower/utils/helpers/amd.c
> @@ -8,7 +8,9 @@
>   #include <pci/pci.h>
>   
>   #include "helpers/helpers.h"
> +#include "cpufreq.h"
>   
> +/* ACPI P-States Helper Functions for AMD Processors ***************/ >   #define MSR_AMD_PSTATE_STATUS	0xc0010063
>   #define MSR_AMD_PSTATE		0xc0010064
>   #define MSR_AMD_PSTATE_LIMIT	0xc0010061
> @@ -146,4 +148,39 @@ int amd_pci_get_num_boost_states(int *active, int *states)
>   	pci_cleanup(pci_acc);
>   	return 0;
>   }
> +
> +/* ACPI P-States Helper Functions for AMD Processors ***************/
> +
> +/* AMD P-States Helper Functions ***************/
> +enum amd_pstate_value {
> +	AMD_PSTATE_HIGHEST_PERF,
> +	AMD_PSTATE_NOMINAL_PERF,
> +	AMD_PSTATE_LOWEST_NONLINEAR_PERF,
> +	AMD_PSTATE_LOWEST_PERF,
> +	AMD_PSTATE_MAX_FREQ,
> +	AMD_PSTATE_NOMINAL_FREQ,
> +	AMD_PSTATE_LOWEST_NONLINEAR_FREQ,
> +	MAX_AMD_PSTATE_VALUE_READ_FILES
> +};
> +
> +static const char *amd_pstate_value_files[MAX_AMD_PSTATE_VALUE_READ_FILES] = {
> +	[AMD_PSTATE_HIGHEST_PERF] = "amd_pstate_highest_perf",
> +	[AMD_PSTATE_NOMINAL_PERF] = "amd_pstate_nominal_perf",
> +	[AMD_PSTATE_LOWEST_NONLINEAR_PERF] = "amd_pstate_lowest_nonlinear_perf",
> +	[AMD_PSTATE_LOWEST_PERF] = "amd_pstate_lowest_perf",
> +	[AMD_PSTATE_MAX_FREQ] = "amd_pstate_max_freq",
> +	[AMD_PSTATE_NOMINAL_FREQ] = "amd_pstate_nominal_freq",
> +	[AMD_PSTATE_LOWEST_NONLINEAR_FREQ] = "amd_pstate_lowest_nonlinear_freq",
> +};
> +
> +static unsigned long amd_pstate_get_data(unsigned int cpu,
> +					 enum amd_pstate_value value)
> +{
> +	return cpufreq_get_sysfs_value_from_table(cpu,
> +						  amd_pstate_value_files,
> +						  value,
> +						  MAX_AMD_PSTATE_VALUE_READ_FILES);
> +}
> +
> +/* AMD P-States Helper Functions ***************/
>   #endif /* defined(__i386__) || defined(__x86_64__) */
>