Loading Documentation/ABI/testing/sysfs-devices-system-cpu +24 −0 Original line number Diff line number Diff line Loading @@ -200,3 +200,27 @@ Description: address and size of the percpu note. note of cpu#. crash_notes_size: size of the note of cpu#. What: /sys/devices/system/cpu/intel_pstate/max_perf_pct /sys/devices/system/cpu/intel_pstate/min_perf_pct /sys/devices/system/cpu/intel_pstate/no_turbo Date: February 2013 Contact: linux-pm@vger.kernel.org Description: Parameters for the Intel P-state driver Logic for selecting the current P-state in Intel Sandybridge+ processors. The three knobs control limits for the P-state that will be requested by the driver. max_perf_pct: limits the maximum P state that will be requested by the driver stated as a percentage of the available performance. min_perf_pct: limits the minimum P state that will be requested by the driver stated as a percentage of the available performance. no_turbo: limits the driver to selecting P states below the turbo frequency range. More details can be found in Documentation/cpu-freq/intel-pstate.txt Documentation/cpu-freq/intel-pstate.txt 0 → 100644 +40 −0 Original line number Diff line number Diff line Intel P-state driver -------------------- This driver implements a scaling driver with an internal governor for Intel Core processors. The driver follows the same model as the Transmeta scaling driver (longrun.c) and implements the setpolicy() instead of target(). Scaling drivers that implement setpolicy() are assumed to implement internal governors by the cpufreq core. All the logic for selecting the current P state is contained within the driver; no external governor is used by the cpufreq core. Intel SandyBridge+ processors are supported. New sysfs files for controlling P state selection have been added to /sys/devices/system/cpu/intel_pstate/ max_perf_pct: limits the maximum P state that will be requested by the driver stated as a percentage of the available performance. min_perf_pct: limits the minimum P state that will be requested by the driver stated as a percentage of the available performance. no_turbo: limits the driver to selecting P states below the turbo frequency range. For contemporary Intel processors, the frequency is controlled by the processor itself and the P-states exposed to software are related to performance levels. The idea that frequency can be set to a single frequency is fiction for Intel Core processors. Even if the scaling driver selects a single P state the actual frequency the processor will run at is selected by the processor itself. New debugfs files have also been added to /sys/kernel/debug/pstate_snb/ deadband d_gain_pct i_gain_pct p_gain_pct sample_rate_ms setpoint arch/arm/mach-exynos/common.c +5 −0 Original line number Diff line number Diff line Loading @@ -303,6 +303,11 @@ void __init exynos_cpuidle_init(void) platform_device_register(&exynos_cpuidle); } void __init exynos_cpufreq_init(void) { platform_device_register_simple("exynos-cpufreq", -1, NULL, 0); } void __init exynos_init_late(void) { if (of_machine_is_compatible("samsung,exynos5440")) Loading arch/arm/mach-exynos/common.h +1 −0 Original line number Diff line number Diff line Loading @@ -22,6 +22,7 @@ void exynos_init_io(void); void exynos4_restart(enum reboot_mode mode, const char *cmd); void exynos5_restart(enum reboot_mode mode, const char *cmd); void exynos_cpuidle_init(void); void exynos_cpufreq_init(void); void exynos_init_late(void); void exynos_firmware_init(void); Loading arch/arm/mach-exynos/mach-exynos4-dt.c +1 −0 Original line number Diff line number Diff line Loading @@ -22,6 +22,7 @@ static void __init exynos4_dt_machine_init(void) { exynos_cpuidle_init(); exynos_cpufreq_init(); of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); } Loading Loading
Documentation/ABI/testing/sysfs-devices-system-cpu +24 −0 Original line number Diff line number Diff line Loading @@ -200,3 +200,27 @@ Description: address and size of the percpu note. note of cpu#. crash_notes_size: size of the note of cpu#. What: /sys/devices/system/cpu/intel_pstate/max_perf_pct /sys/devices/system/cpu/intel_pstate/min_perf_pct /sys/devices/system/cpu/intel_pstate/no_turbo Date: February 2013 Contact: linux-pm@vger.kernel.org Description: Parameters for the Intel P-state driver Logic for selecting the current P-state in Intel Sandybridge+ processors. The three knobs control limits for the P-state that will be requested by the driver. max_perf_pct: limits the maximum P state that will be requested by the driver stated as a percentage of the available performance. min_perf_pct: limits the minimum P state that will be requested by the driver stated as a percentage of the available performance. no_turbo: limits the driver to selecting P states below the turbo frequency range. More details can be found in Documentation/cpu-freq/intel-pstate.txt
Documentation/cpu-freq/intel-pstate.txt 0 → 100644 +40 −0 Original line number Diff line number Diff line Intel P-state driver -------------------- This driver implements a scaling driver with an internal governor for Intel Core processors. The driver follows the same model as the Transmeta scaling driver (longrun.c) and implements the setpolicy() instead of target(). Scaling drivers that implement setpolicy() are assumed to implement internal governors by the cpufreq core. All the logic for selecting the current P state is contained within the driver; no external governor is used by the cpufreq core. Intel SandyBridge+ processors are supported. New sysfs files for controlling P state selection have been added to /sys/devices/system/cpu/intel_pstate/ max_perf_pct: limits the maximum P state that will be requested by the driver stated as a percentage of the available performance. min_perf_pct: limits the minimum P state that will be requested by the driver stated as a percentage of the available performance. no_turbo: limits the driver to selecting P states below the turbo frequency range. For contemporary Intel processors, the frequency is controlled by the processor itself and the P-states exposed to software are related to performance levels. The idea that frequency can be set to a single frequency is fiction for Intel Core processors. Even if the scaling driver selects a single P state the actual frequency the processor will run at is selected by the processor itself. New debugfs files have also been added to /sys/kernel/debug/pstate_snb/ deadband d_gain_pct i_gain_pct p_gain_pct sample_rate_ms setpoint
arch/arm/mach-exynos/common.c +5 −0 Original line number Diff line number Diff line Loading @@ -303,6 +303,11 @@ void __init exynos_cpuidle_init(void) platform_device_register(&exynos_cpuidle); } void __init exynos_cpufreq_init(void) { platform_device_register_simple("exynos-cpufreq", -1, NULL, 0); } void __init exynos_init_late(void) { if (of_machine_is_compatible("samsung,exynos5440")) Loading
arch/arm/mach-exynos/common.h +1 −0 Original line number Diff line number Diff line Loading @@ -22,6 +22,7 @@ void exynos_init_io(void); void exynos4_restart(enum reboot_mode mode, const char *cmd); void exynos5_restart(enum reboot_mode mode, const char *cmd); void exynos_cpuidle_init(void); void exynos_cpufreq_init(void); void exynos_init_late(void); void exynos_firmware_init(void); Loading
arch/arm/mach-exynos/mach-exynos4-dt.c +1 −0 Original line number Diff line number Diff line Loading @@ -22,6 +22,7 @@ static void __init exynos4_dt_machine_init(void) { exynos_cpuidle_init(); exynos_cpufreq_init(); of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); } Loading
