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Also define ARCH_CPUIDLE_HALTPOLL to allow cpuidle-haltpoll to be selected, and given that we have an optimized polling mechanism in smp_cond_load*(), select ARCH_HAS_OPTIMIZED_POLL. smp_cond_load*() are implemented via LDXR, WFE, with LDXR loading a memory region in exclusive state and the WFE waiting for any stores to it. In the edge case -- no CPU stores to the waited region and there's no interrupt -- the event-stream will provide the terminating condition ensuring we don't wait forever, but because the event-stream runs at a fixed frequency (configured at 10kHz) we might spend more time in the polling stage than specified by cpuidle_poll_time(). This would only happen in the last iteration, since overshooting the poll_limit means the governor moves out of the polling stage. Signed-off-by: Ankur Arora Tested-by: Haris Okanovic --- arch/arm64/Kconfig | 10 ++++++++++ arch/arm64/include/asm/cpuidle_haltpoll.h | 9 +++++++++ arch/arm64/kernel/cpuidle.c | 23 +++++++++++++++++++++++ 3 files changed, 42 insertions(+) create mode 100644 arch/arm64/include/asm/cpuidle_haltpoll.h diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 5d91259ee7b5..cf1c6681eb0a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -35,6 +35,7 @@ config ARM64 select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE + select ARCH_HAS_OPTIMIZED_POLL select ARCH_HAS_PTE_DEVMAP select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_HW_PTE_YOUNG @@ -2376,6 +2377,15 @@ config ARCH_HIBERNATION_HEADER config ARCH_SUSPEND_POSSIBLE def_bool y +config ARCH_CPUIDLE_HALTPOLL + bool "Enable selection of the cpuidle-haltpoll driver" + default n + help + cpuidle-haltpoll allows for adaptive polling based on + current load before entering the idle state. + + Some virtualized workloads benefit from using it. + 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..65f289407a6c --- /dev/null +++ b/arch/arm64/include/asm/cpuidle_haltpoll.h @@ -0,0 +1,9 @@ +/* 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) { } + +bool arch_haltpoll_want(bool force); +#endif diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c index f372295207fb..334df82a0eac 100644 --- a/arch/arm64/kernel/cpuidle.c +++ b/arch/arm64/kernel/cpuidle.c @@ -72,3 +72,26 @@ __cpuidle int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi) lpi->index, state); } #endif + +#if IS_ENABLED(CONFIG_HALTPOLL_CPUIDLE) + +#include + +bool arch_haltpoll_want(bool force) +{ + /* + * Enabling haltpoll requires two things: + * + * - Event stream support to provide a terminating condition to the + * WFE in the poll loop. + * + * - KVM support for arch_haltpoll_enable(), arch_haltpoll_enable(). + * + * Given that the second is missing, allow haltpoll to only be force + * loaded. + */ + return (arch_timer_evtstrm_available() && false) || force; +} + +EXPORT_SYMBOL_GPL(arch_haltpoll_want); +#endif