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 <[email protected]> --- 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 ################################################################################## # ARM SoC drivers -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
