RE: [PATCH v6 03/11] cpufreq: intel_pstate: use common macro definition for Energy Preference Performance(EPP)

[Yuan, Perry]

[AMD Official Use Only - General]

Hi Ray. 

> -----Original Message-----
> From: Huang, Ray <Ray.Huang@xxxxxxx>
> Sent: Monday, December 5, 2022 7:49 PM
> To: Yuan, Perry <Perry.Yuan@xxxxxxx>
> Cc: rafael.j.wysocki@xxxxxxxxx; Limonciello, Mario
> <Mario.Limonciello@xxxxxxx>; viresh.kumar@xxxxxxxxxx; Sharma, Deepak
> <Deepak.Sharma@xxxxxxx>; Fontenot, Nathan
> <Nathan.Fontenot@xxxxxxx>; Deucher, Alexander
> <Alexander.Deucher@xxxxxxx>; Huang, Shimmer
> <Shimmer.Huang@xxxxxxx>; Du, Xiaojian <Xiaojian.Du@xxxxxxx>; Meng,
> Li (Jassmine) <Li.Meng@xxxxxxx>; Karny, Wyes <Wyes.Karny@xxxxxxx>;
> linux-pm@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH v6 03/11] cpufreq: intel_pstate: use common macro
> definition for Energy Preference Performance(EPP)
> 
> On Fri, Dec 02, 2022 at 03:47:11PM +0800, Yuan, Perry wrote:
> > make the energy preference performance strings and profiles using one
> > common header for intel_pstate driver, then the amd_pstate epp driver
> > can use the common header as well. This will simpify the intel_pstate
> > and amd_pstate driver.
> >
> > Signed-off-by: Perry Yuan <perry.yuan@xxxxxxx>
> > ---
> >  arch/x86/include/asm/msr-index.h |  4 ---
> >  drivers/cpufreq/intel_pstate.c   | 37 +--------------------
> >  include/linux/cpufreq_common.h   | 56
> ++++++++++++++++++++++++++++++++
> 
> I don't find any specific reason why you have to use another common
> cpufreq_common header instead of include/linux/cpufreq.h.
> 
> Thanks,
> Ray

That is fine for me to use the cpufreq.h to store the common vars.
I will move the declaration to that header file.

Thanks for the review.

Perry. 

> 
> >  3 files changed, 57 insertions(+), 40 deletions(-)  create mode
> > 100644 include/linux/cpufreq_common.h
> >
> > diff --git a/arch/x86/include/asm/msr-index.h
> > b/arch/x86/include/asm/msr-index.h
> > index 4a2af82553e4..3983378cff5b 100644
> > --- a/arch/x86/include/asm/msr-index.h
> > +++ b/arch/x86/include/asm/msr-index.h
> > @@ -472,10 +472,6 @@
> >  #define HWP_MAX_PERF(x) 		((x & 0xff) << 8)
> >  #define HWP_DESIRED_PERF(x)		((x & 0xff) << 16)
> >  #define HWP_ENERGY_PERF_PREFERENCE(x)	(((unsigned long long)
> x & 0xff) << 24)
> > -#define HWP_EPP_PERFORMANCE		0x00
> > -#define HWP_EPP_BALANCE_PERFORMANCE	0x80
> > -#define HWP_EPP_BALANCE_POWERSAVE	0xC0
> > -#define HWP_EPP_POWERSAVE		0xFF
> >  #define HWP_ACTIVITY_WINDOW(x)		((unsigned long
> long)(x & 0xff3) << 32)
> >  #define HWP_PACKAGE_CONTROL(x)		((unsigned long
> long)(x & 0x1) << 42)
> >
> > diff --git a/drivers/cpufreq/intel_pstate.c
> > b/drivers/cpufreq/intel_pstate.c index ad9be31753b6..65036ca21719
> > 100644
> > --- a/drivers/cpufreq/intel_pstate.c
> > +++ b/drivers/cpufreq/intel_pstate.c
> > @@ -25,6 +25,7 @@
> >  #include <linux/acpi.h>
> >  #include <linux/vmalloc.h>
> >  #include <linux/pm_qos.h>
> > +#include <linux/cpufreq_common.h>
> >  #include <trace/events/power.h>
> >
> >  #include <asm/cpu.h>
> > @@ -628,42 +629,6 @@ static int intel_pstate_set_epb(int cpu, s16 pref)
> >  	return 0;
> >  }
> >
> > -/*
> > - * EPP/EPB display strings corresponding to EPP index in the
> > - * energy_perf_strings[]
> > - *	index		String
> > - *-------------------------------------
> > - *	0		default
> > - *	1		performance
> > - *	2		balance_performance
> > - *	3		balance_power
> > - *	4		power
> > - */
> > -
> > -enum energy_perf_value_index {
> > -	EPP_INDEX_DEFAULT = 0,
> > -	EPP_INDEX_PERFORMANCE,
> > -	EPP_INDEX_BALANCE_PERFORMANCE,
> > -	EPP_INDEX_BALANCE_POWERSAVE,
> > -	EPP_INDEX_POWERSAVE,
> > -};
> > -
> > -static const char * const energy_perf_strings[] = {
> > -	[EPP_INDEX_DEFAULT] = "default",
> > -	[EPP_INDEX_PERFORMANCE] = "performance",
> > -	[EPP_INDEX_BALANCE_PERFORMANCE] = "balance_performance",
> > -	[EPP_INDEX_BALANCE_POWERSAVE] = "balance_power",
> > -	[EPP_INDEX_POWERSAVE] = "power",
> > -	NULL
> > -};
> > -static unsigned int epp_values[] = {
> > -	[EPP_INDEX_DEFAULT] = 0, /* Unused index */
> > -	[EPP_INDEX_PERFORMANCE] = HWP_EPP_PERFORMANCE,
> > -	[EPP_INDEX_BALANCE_PERFORMANCE] =
> HWP_EPP_BALANCE_PERFORMANCE,
> > -	[EPP_INDEX_BALANCE_POWERSAVE] =
> HWP_EPP_BALANCE_POWERSAVE,
> > -	[EPP_INDEX_POWERSAVE] = HWP_EPP_POWERSAVE,
> > -};
> > -
> >  static int intel_pstate_get_energy_pref_index(struct cpudata
> > *cpu_data, int *raw_epp)  {
> >  	s16 epp;
> > diff --git a/include/linux/cpufreq_common.h
> > b/include/linux/cpufreq_common.h new file mode 100644 index
> > 000000000000..2d14b0b0f55c
> > --- /dev/null
> > +++ b/include/linux/cpufreq_common.h
> > @@ -0,0 +1,56 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * linux/include/linux/cpufreq_common.h
> > + *
> > + * Copyright (C) 2022 Advanced Micro Devices, Inc.
> > + *
> > + * Author: Perry Yuan <Perry.Yuan@xxxxxxx>  */
> > +
> > +#ifndef _LINUX_CPUFREQ_COMMON_H
> > +#define _LINUX_CPUFREQ_COMMON_H
> > +
> > +#include <asm/msr.h>
> > +/*
> > + * EPP/EPB display strings corresponding to EPP index in the
> > + * energy_perf_strings[]
> > + *	index		String
> > + *-------------------------------------
> > + *	0		default
> > + *	1		performance
> > + *	2		balance_performance
> > + *	3		balance_power
> > + *	4		power
> > + */
> > +
> > +#define HWP_EPP_PERFORMANCE		0x00
> > +#define HWP_EPP_BALANCE_PERFORMANCE	0x80
> > +#define HWP_EPP_BALANCE_POWERSAVE	0xC0
> > +#define HWP_EPP_POWERSAVE		0xFF
> > +
> > +enum energy_perf_value_index {
> > +	EPP_INDEX_DEFAULT = 0,
> > +	EPP_INDEX_PERFORMANCE,
> > +	EPP_INDEX_BALANCE_PERFORMANCE,
> > +	EPP_INDEX_BALANCE_POWERSAVE,
> > +	EPP_INDEX_POWERSAVE,
> > +};
> > +
> > +static const char * const energy_perf_strings[] = {
> > +	[EPP_INDEX_DEFAULT] = "default",
> > +	[EPP_INDEX_PERFORMANCE] = "performance",
> > +	[EPP_INDEX_BALANCE_PERFORMANCE] = "balance_performance",
> > +	[EPP_INDEX_BALANCE_POWERSAVE] = "balance_power",
> > +	[EPP_INDEX_POWERSAVE] = "power",
> > +	NULL
> > +};
> > +
> > +static unsigned int epp_values[] = {
> > +	[EPP_INDEX_DEFAULT] = 0, /* Unused index */
> > +	[EPP_INDEX_PERFORMANCE] = HWP_EPP_PERFORMANCE,
> > +	[EPP_INDEX_BALANCE_PERFORMANCE] =
> HWP_EPP_BALANCE_PERFORMANCE,
> > +	[EPP_INDEX_BALANCE_POWERSAVE] =
> HWP_EPP_BALANCE_POWERSAVE,
> > +	[EPP_INDEX_POWERSAVE] = HWP_EPP_POWERSAVE, };
> > +
> > +#endif /* _LINUX_CPUFREQ_COMMON_H */
> > \ No newline at end of file
> > --
> > 2.34.1
> >

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