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

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Date:   Mon, 1 Nov 2021 17:14:47 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Limonciello, Mario" <Mario.Limonciello@....com>
Cc:     "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" <linux-pm@...r.kernel.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        Steven Noonan <steven@...vesoftware.com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v3 17/21] cpupower: add amd-pstate sysfs definition and
 access helper

On Fri, Oct 29, 2021 at 10:10:13PM +0800, Limonciello, Mario wrote:
> 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.

Thanks, it's should be "macro".

Ray

> 
> > 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__) */
> > 
>