# SPDX-License-Identifier: GPL-2.0-only
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menu "CPU Idle"
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config CPU_IDLE
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bool "CPU idle PM support"
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default y if ACPI || PPC_PSERIES
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select CPU_IDLE_GOV_LADDER if (!NO_HZ && !NO_HZ_IDLE)
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select CPU_IDLE_GOV_MENU if (NO_HZ || NO_HZ_IDLE) && !CPU_IDLE_GOV_TEO
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help
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CPU idle is a generic framework for supporting software-controlled
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idle processor power management. It includes modular cross-platform
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governors that can be swapped during runtime.
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If you're using an ACPI-enabled platform, you should say Y here.
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if CPU_IDLE
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config CPU_IDLE_MULTIPLE_DRIVERS
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bool
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config CPU_IDLE_GOV_LADDER
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bool "Ladder governor (for periodic timer tick)"
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config CPU_IDLE_GOV_MENU
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bool "Menu governor (for tickless system)"
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config CPU_IDLE_GOV_TEO
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bool "Timer events oriented (TEO) governor (for tickless systems)"
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help
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This governor implements a simplified idle state selection method
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focused on timer events and does not do any interactivity boosting.
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Some workloads benefit from using it and it generally should be safe
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to use. Say Y here if you are not happy with the alternatives.
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config CPU_IDLE_GOV_HALTPOLL
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bool "Haltpoll governor (for virtualized systems)"
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depends on KVM_GUEST
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help
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This governor implements haltpoll idle state selection, to be
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used in conjunction with the haltpoll cpuidle driver, allowing
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for polling for a certain amount of time before entering idle
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state.
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Some virtualized workloads benefit from using it.
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config DT_IDLE_STATES
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bool
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menu "ARM CPU Idle Drivers"
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depends on ARM || ARM64
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source "drivers/cpuidle/Kconfig.arm"
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endmenu
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menu "MIPS CPU Idle Drivers"
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depends on MIPS
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source "drivers/cpuidle/Kconfig.mips"
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endmenu
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menu "POWERPC CPU Idle Drivers"
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depends on PPC
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source "drivers/cpuidle/Kconfig.powerpc"
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endmenu
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config HALTPOLL_CPUIDLE
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tristate "Halt poll cpuidle driver"
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depends on X86 && KVM_GUEST
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default y
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help
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This option enables halt poll cpuidle driver, which allows to poll
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before halting in the guest (more efficient than polling in the
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host via halt_poll_ns for some scenarios).
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endif
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config ARCH_NEEDS_CPU_IDLE_COUPLED
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def_bool n
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endmenu
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