From: Ankur Arora ankur.a.arora@oracle.com
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 harisokn@amazon.com Tested-by: Misono Tomohiro misono.tomohiro@fujitsu.com Signed-off-by: Ankur Arora ankur.a.arora@oracle.com Signed-off-by: lishusen lishusen2@huawei.com --- 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 71cf32eb8b69..d3a2e59eade6 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2618,6 +2618,12 @@ 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