[PATCH v10 11/11] arm64: support cpuidle-haltpoll
From: Ankur Arora <hidden>
Date: 2025-02-18 21:35:03
Also in:
kvm, linux-acpi, linux-pm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Add architectural support for the cpuidle-haltpoll driver by defining arch_haltpoll_*(). Also define ARCH_CPUIDLE_HALTPOLL to allow cpuidle-haltpoll to be selected. Tested-by: Haris Okanovic <redacted> Tested-by: Misono Tomohiro <redacted> Signed-off-by: Ankur Arora <redacted> --- arch/arm64/Kconfig | 6 ++++++ arch/arm64/include/asm/cpuidle_haltpoll.h | 20 ++++++++++++++++++++ 2 files changed, 26 insertions(+) create mode 100644 arch/arm64/include/asm/cpuidle_haltpoll.h
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index d96a6c6d8894..eef50fd9a190 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -2485,6 +2485,12 @@ config ARCH_HIBERNATION_HEADER config ARCH_SUSPEND_POSSIBLE def_bool y +config ARCH_CPUIDLE_HALTPOLL + bool "Enable selection of the cpuidle-haltpoll driver" + help + cpuidle-haltpoll allows for adaptive polling based on + current load before entering the idle state. + endmenu # "Power management options" menu "CPU Power Management"
diff --git a/arch/arm64/include/asm/cpuidle_haltpoll.h b/arch/arm64/include/asm/cpuidle_haltpoll.h
new file mode 100644
index 000000000000..aa01ae9ad5dd
--- /dev/null
+++ b/arch/arm64/include/asm/cpuidle_haltpoll.h@@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _ARCH_HALTPOLL_H +#define _ARCH_HALTPOLL_H + +static inline void arch_haltpoll_enable(unsigned int cpu) { } +static inline void arch_haltpoll_disable(unsigned int cpu) { } + +static inline bool arch_haltpoll_want(bool force) +{ + /* + * Enabling haltpoll requires KVM support for arch_haltpoll_enable(), + * arch_haltpoll_disable(). + * + * Given that that's missing right now, only allow force loading for + * haltpoll. + */ + return force; +} +#endif
--
2.43.5