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Message-ID: <20130327224122.GA15786@jshin-Toonie>
Date: Wed, 27 Mar 2013 17:41:22 -0500
From: Jacob Shin <jacob.shin@....com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
CC: <cpufreq@...r.kernel.org>, <linux-pm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH 2/2] cpufreq: AMD "frequency sensitivity feedback"
powersave bias for ondemand governor
On Wed, Mar 27, 2013 at 05:37:21PM -0500, Jacob Shin wrote:
> Future AMD processors, starting with Family 16h, can provide software
> with feedback on how the workload may respond to frequency change --
> memory-bound workloads will not benefit from higher frequency, where
> as compute-bound workloads will. This patch enables this "frequency
> sensitivity feedback" to aid the ondemand governor to make better
> frequency change decisions by hooking into the powersave bias.
>
> Signed-off-by: Jacob Shin <jacob.shin@....com>
> ---
> arch/x86/include/uapi/asm/msr-index.h | 1 +
> drivers/cpufreq/Kconfig.x86 | 10 ++++++++++
> drivers/cpufreq/Makefile | 1 +
> 3 files changed, 12 insertions(+)
>
> diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
> index 7a060f4..b2e6c49 100644
> --- a/arch/x86/include/uapi/asm/msr-index.h
> +++ b/arch/x86/include/uapi/asm/msr-index.h
> @@ -173,6 +173,7 @@
> #define MSR_AMD64_TSC_RATIO 0xc0000104
> #define MSR_AMD64_NB_CFG 0xc001001f
> #define MSR_AMD64_PATCH_LOADER 0xc0010020
> +#define MSR_AMD64_FREQ_SENSITIVITY 0xc0010080
> #define MSR_AMD64_OSVW_ID_LENGTH 0xc0010140
> #define MSR_AMD64_OSVW_STATUS 0xc0010141
> #define MSR_AMD64_DC_CFG 0xc0011022
> diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
> index d7dc0ed..6c714b0 100644
> --- a/drivers/cpufreq/Kconfig.x86
> +++ b/drivers/cpufreq/Kconfig.x86
> @@ -129,6 +129,16 @@ config X86_POWERNOW_K8
>
> For details, take a look at <file:Documentation/cpu-freq/>.
>
> +config X86_AMD_FREQ_SENSITIVITY
> + tristate "AMD 'frequency sensitivity feedback' powersave bias"
> + depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ
> + help
> + This adds support for 'frequency sensitivity feedback' feature on
> + supported AMD processors, which hooks into the ondemand governor's
> + powersave bias to influence frequency change decisions.
> +
> + If in doubt, say N.
> +
> config X86_GX_SUSPMOD
> tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
> depends on X86_32 && PCI
> diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
> index 863fd18..01dfdaf 100644
> --- a/drivers/cpufreq/Makefile
> +++ b/drivers/cpufreq/Makefile
> @@ -41,6 +41,7 @@ obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO) += speedstep-centrino.o
> obj-$(CONFIG_X86_P4_CLOCKMOD) += p4-clockmod.o
> obj-$(CONFIG_X86_CPUFREQ_NFORCE2) += cpufreq-nforce2.o
> obj-$(CONFIG_X86_INTEL_PSTATE) += intel_pstate.o
> +obj-$(CONFIG_X86_AMD_FREQ_SENSITIVITY) += amd_freq_sensitivity.o
So sorry .. this file did not get git add'ed. Will resend in a bit
>
> ##################################################################################
> # ARM SoC drivers
> --
> 1.7.9.5
>
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