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325 lines
9.7 KiB
325 lines
9.7 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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menu "CPU Frequency scaling" |
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config CPU_FREQ |
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bool "CPU Frequency scaling" |
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select SRCU |
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help |
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CPU Frequency scaling allows you to change the clock speed of |
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CPUs on the fly. This is a nice method to save power, because |
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the lower the CPU clock speed, the less power the CPU consumes. |
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Note that this driver doesn't automatically change the CPU |
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clock speed, you need to either enable a dynamic cpufreq governor |
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(see below) after boot, or use a userspace tool. |
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For details, take a look at |
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<file:Documentation/admin-guide/pm/cpufreq.rst>. |
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If in doubt, say N. |
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if CPU_FREQ |
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config CPU_FREQ_GOV_ATTR_SET |
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bool |
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config CPU_FREQ_GOV_COMMON |
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select CPU_FREQ_GOV_ATTR_SET |
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select IRQ_WORK |
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bool |
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config CPU_FREQ_STAT |
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bool "CPU frequency transition statistics" |
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help |
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Export CPU frequency statistics information through sysfs. |
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If in doubt, say N. |
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choice |
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prompt "Default CPUFreq governor" |
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default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ |
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default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if ARM64 || ARM |
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default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if X86_INTEL_PSTATE && SMP |
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default CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
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help |
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This option sets which CPUFreq governor shall be loaded at |
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startup. If in doubt, use the default setting. |
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config CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
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bool "performance" |
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select CPU_FREQ_GOV_PERFORMANCE |
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help |
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Use the CPUFreq governor 'performance' as default. This sets |
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the frequency statically to the highest frequency supported by |
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the CPU. |
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config CPU_FREQ_DEFAULT_GOV_POWERSAVE |
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bool "powersave" |
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select CPU_FREQ_GOV_POWERSAVE |
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help |
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Use the CPUFreq governor 'powersave' as default. This sets |
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the frequency statically to the lowest frequency supported by |
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the CPU. |
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config CPU_FREQ_DEFAULT_GOV_USERSPACE |
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bool "userspace" |
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select CPU_FREQ_GOV_USERSPACE |
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help |
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Use the CPUFreq governor 'userspace' as default. This allows |
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you to set the CPU frequency manually or when a userspace |
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program shall be able to set the CPU dynamically without having |
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to enable the userspace governor manually. |
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config CPU_FREQ_DEFAULT_GOV_ONDEMAND |
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bool "ondemand" |
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depends on !(X86_INTEL_PSTATE && SMP) |
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select CPU_FREQ_GOV_ONDEMAND |
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select CPU_FREQ_GOV_PERFORMANCE |
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help |
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Use the CPUFreq governor 'ondemand' as default. This allows |
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you to get a full dynamic frequency capable system by simply |
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loading your cpufreq low-level hardware driver. |
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Be aware that not all cpufreq drivers support the ondemand |
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governor. If unsure have a look at the help section of the |
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driver. Fallback governor will be the performance governor. |
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config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE |
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bool "conservative" |
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depends on !(X86_INTEL_PSTATE && SMP) |
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select CPU_FREQ_GOV_CONSERVATIVE |
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select CPU_FREQ_GOV_PERFORMANCE |
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help |
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Use the CPUFreq governor 'conservative' as default. This allows |
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you to get a full dynamic frequency capable system by simply |
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loading your cpufreq low-level hardware driver. |
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Be aware that not all cpufreq drivers support the conservative |
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governor. If unsure have a look at the help section of the |
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driver. Fallback governor will be the performance governor. |
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config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL |
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bool "schedutil" |
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depends on SMP |
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select CPU_FREQ_GOV_SCHEDUTIL |
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select CPU_FREQ_GOV_PERFORMANCE |
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help |
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Use the 'schedutil' CPUFreq governor by default. If unsure, |
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have a look at the help section of that governor. The fallback |
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governor will be 'performance'. |
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endchoice |
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config CPU_FREQ_GOV_PERFORMANCE |
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tristate "'performance' governor" |
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help |
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This cpufreq governor sets the frequency statically to the |
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highest available CPU frequency. |
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To compile this driver as a module, choose M here: the |
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module will be called cpufreq_performance. |
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If in doubt, say Y. |
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config CPU_FREQ_GOV_POWERSAVE |
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tristate "'powersave' governor" |
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help |
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This cpufreq governor sets the frequency statically to the |
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lowest available CPU frequency. |
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To compile this driver as a module, choose M here: the |
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module will be called cpufreq_powersave. |
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If in doubt, say Y. |
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config CPU_FREQ_GOV_USERSPACE |
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tristate "'userspace' governor for userspace frequency scaling" |
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help |
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Enable this cpufreq governor when you either want to set the |
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CPU frequency manually or when a userspace program shall |
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be able to set the CPU dynamically, like on LART |
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<http://www.lartmaker.nl/>. |
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To compile this driver as a module, choose M here: the |
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module will be called cpufreq_userspace. |
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If in doubt, say Y. |
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config CPU_FREQ_GOV_ONDEMAND |
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tristate "'ondemand' cpufreq policy governor" |
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select CPU_FREQ_GOV_COMMON |
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help |
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'ondemand' - This driver adds a dynamic cpufreq policy governor. |
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The governor does a periodic polling and |
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changes frequency based on the CPU utilization. |
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The support for this governor depends on CPU capability to |
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do fast frequency switching (i.e, very low latency frequency |
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transitions). |
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To compile this driver as a module, choose M here: the |
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module will be called cpufreq_ondemand. |
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For details, take a look at |
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<file:Documentation/admin-guide/pm/cpufreq.rst>. |
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If in doubt, say N. |
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config CPU_FREQ_GOV_CONSERVATIVE |
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tristate "'conservative' cpufreq governor" |
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depends on CPU_FREQ |
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select CPU_FREQ_GOV_COMMON |
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help |
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'conservative' - this driver is rather similar to the 'ondemand' |
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governor both in its source code and its purpose, the difference is |
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its optimisation for better suitability in a battery powered |
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environment. The frequency is gracefully increased and decreased |
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rather than jumping to 100% when speed is required. |
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If you have a desktop machine then you should really be considering |
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the 'ondemand' governor instead, however if you are using a laptop, |
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PDA or even an AMD64 based computer (due to the unacceptable |
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step-by-step latency issues between the minimum and maximum frequency |
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transitions in the CPU) you will probably want to use this governor. |
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To compile this driver as a module, choose M here: the |
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module will be called cpufreq_conservative. |
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For details, take a look at |
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<file:Documentation/admin-guide/pm/cpufreq.rst>. |
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If in doubt, say N. |
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config CPU_FREQ_GOV_SCHEDUTIL |
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bool "'schedutil' cpufreq policy governor" |
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depends on CPU_FREQ && SMP |
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select CPU_FREQ_GOV_ATTR_SET |
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select IRQ_WORK |
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help |
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This governor makes decisions based on the utilization data provided |
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by the scheduler. It sets the CPU frequency to be proportional to |
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the utilization/capacity ratio coming from the scheduler. If the |
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utilization is frequency-invariant, the new frequency is also |
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proportional to the maximum available frequency. If that is not the |
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case, it is proportional to the current frequency of the CPU. The |
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frequency tipping point is at utilization/capacity equal to 80% in |
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both cases. |
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If in doubt, say N. |
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comment "CPU frequency scaling drivers" |
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config CPUFREQ_DT |
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tristate "Generic DT based cpufreq driver" |
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depends on HAVE_CLK && OF |
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select CPUFREQ_DT_PLATDEV |
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select PM_OPP |
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help |
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This adds a generic DT based cpufreq driver for frequency management. |
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It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) |
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systems. |
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If in doubt, say N. |
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config CPUFREQ_DT_PLATDEV |
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bool |
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help |
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This adds a generic DT based cpufreq platdev driver for frequency |
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management. This creates a 'cpufreq-dt' platform device, on the |
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supported platforms. |
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If in doubt, say N. |
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if X86 |
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source "drivers/cpufreq/Kconfig.x86" |
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endif |
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if ARM || ARM64 |
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source "drivers/cpufreq/Kconfig.arm" |
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endif |
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if PPC32 || PPC64 |
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source "drivers/cpufreq/Kconfig.powerpc" |
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endif |
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if IA64 |
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config IA64_ACPI_CPUFREQ |
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tristate "ACPI Processor P-States driver" |
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depends on ACPI_PROCESSOR |
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help |
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This driver adds a CPUFreq driver which utilizes the ACPI |
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Processor Performance States. |
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If in doubt, say N. |
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endif |
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if MIPS |
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config BMIPS_CPUFREQ |
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tristate "BMIPS CPUfreq Driver" |
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help |
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This option adds a CPUfreq driver for BMIPS processors with |
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support for configurable CPU frequency. |
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For now, BMIPS5 chips are supported (such as the Broadcom 7425). |
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If in doubt, say N. |
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config LOONGSON2_CPUFREQ |
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tristate "Loongson2 CPUFreq Driver" |
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depends on LEMOTE_MACH2F |
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help |
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This option adds a CPUFreq driver for loongson processors which |
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support software configurable cpu frequency. |
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Loongson2F and it's successors support this feature. |
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If in doubt, say N. |
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config LOONGSON1_CPUFREQ |
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tristate "Loongson1 CPUFreq Driver" |
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depends on LOONGSON1_LS1B |
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help |
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This option adds a CPUFreq driver for loongson1 processors which |
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support software configurable cpu frequency. |
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If in doubt, say N. |
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endif |
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if SPARC64 |
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config SPARC_US3_CPUFREQ |
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tristate "UltraSPARC-III CPU Frequency driver" |
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help |
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This adds the CPUFreq driver for UltraSPARC-III processors. |
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If in doubt, say N. |
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config SPARC_US2E_CPUFREQ |
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tristate "UltraSPARC-IIe CPU Frequency driver" |
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help |
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This adds the CPUFreq driver for UltraSPARC-IIe processors. |
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If in doubt, say N. |
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endif |
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if SUPERH |
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config SH_CPU_FREQ |
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tristate "SuperH CPU Frequency driver" |
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help |
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This adds the cpufreq driver for SuperH. Any CPU that supports |
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clock rate rounding through the clock framework can use this |
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driver. While it will make the kernel slightly larger, this is |
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harmless for CPUs that don't support rate rounding. The driver |
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will also generate a notice in the boot log before disabling |
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itself if the CPU in question is not capable of rate rounding. |
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If unsure, say N. |
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endif |
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config QORIQ_CPUFREQ |
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tristate "CPU frequency scaling driver for Freescale QorIQ SoCs" |
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depends on OF && COMMON_CLK |
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depends on PPC_E500MC || SOC_LS1021A || ARCH_LAYERSCAPE || COMPILE_TEST |
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select CLK_QORIQ |
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help |
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This adds the CPUFreq driver support for Freescale QorIQ SoCs |
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which are capable of changing the CPU's frequency dynamically. |
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endif |
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endmenu
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