linux-kernel - Re: [PATCH v7 03/13] cpufreq: intel_pstate: use common macro definition for Energy Preference Performance(EPP)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 9 Dec 2022 16:01:25 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Yuan, Perry" <Perry.Yuan@....com>
Cc:     "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Huang, Shimmer" <Shimmer.Huang@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "Karny, Wyes" <Wyes.Karny@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 03/13] cpufreq: intel_pstate: use common macro
 definition for Energy Preference Performance(EPP)

On Thu, Dec 08, 2022 at 07:18:42PM +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@....com>

Please address the comment in V6:

https://lore.kernel.org/linux-pm/Y43aq2gMKnFRIhxh@amd.com/T/#md503ee2fa32858e6cc9ab4da9ec1b89a6bae6058

Thanks,
Ray

> ---
>  arch/x86/include/asm/msr-index.h |  4 ---
>  drivers/cpufreq/intel_pstate.c   | 37 +---------------------
>  include/linux/cpufreq_common.h   | 53 ++++++++++++++++++++++++++++++++
>  3 files changed, 54 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..1b842ed874ab 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -26,6 +26,7 @@
>  #include <linux/vmalloc.h>
>  #include <linux/pm_qos.h>
>  #include <trace/events/power.h>
> +#include <linux/cpufreq_common.h>
>  
>  #include <asm/cpu.h>
>  #include <asm/div64.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..c1224e3bc68b
> --- /dev/null
> +++ b/include/linux/cpufreq_common.h
> @@ -0,0 +1,53 @@
> +/* 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@....com>
> + */
> +
> +#ifndef _LINUX_CPUFREQ_COMMON_H
> +#define _LINUX_CPUFREQ_COMMON_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 */
> -- 
> 2.34.1
>