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Tue, 30 Apr 2024 18:37:53 +0000 Received: from CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::4104:529:ba06:fcb8]) by CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::4104:529:ba06:fcb8%7]) with mapi id 15.20.7519.031; Tue, 30 Apr 2024 18:37:53 +0000 From: Ankur Arora To: linux-pm@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, pbonzini@redhat.com, wanpengli@tencent.com, vkuznets@redhat.com, rafael@kernel.org, daniel.lezcano@linaro.org, peterz@infradead.org, arnd@arndb.de, lenb@kernel.org, mark.rutland@arm.com, harisokn@amazon.com, joao.m.martins@oracle.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, ankur.a.arora@oracle.com Subject: [PATCH 8/9] arm64: support cpuidle-haltpoll Date: Tue, 30 Apr 2024 11:37:29 -0700 Message-Id: <20240430183730.561960-9-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240430183730.561960-1-ankur.a.arora@oracle.com> References: <20240430183730.561960-1-ankur.a.arora@oracle.com> X-ClientProxiedBy: MW4PR03CA0334.namprd03.prod.outlook.com (2603:10b6:303:dc::9) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|SN7PR10MB6308:EE_ X-MS-Office365-Filtering-Correlation-Id: 43cf9dc7-bd75-406b-e896-08dc6944a562 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|7416005|366007|376005|1800799015; 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Also select ARCH_HAS_OPTIMIZED_POLL since we have an optimized polling mechanism via smp_cond_load*(). Add the configuration option, ARCH_CPUIDLE_HALTPOLL to allow cpuidle-haltpoll to be selected. Note that we limit cpuidle-haltpoll support to when the event-stream is available. This is necessary because polling via smp_cond_load_relaxed() uses WFE to wait for a store which might not happen for an prolonged period of time. So, ensure the event-stream is around to provide a terminating condition. Signed-off-by: Ankur Arora --- arch/arm64/Kconfig | 10 ++++++++++ arch/arm64/include/asm/cpuidle_haltpoll.h | 21 +++++++++++++++++++++ 2 files changed, 31 insertions(+) create mode 100644 arch/arm64/include/asm/cpuidle_haltpoll.h diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 7b11c98b3e84..6f2df162b10e 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -34,6 +34,7 @@ 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 @@ -2331,6 +2332,15 @@ 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..a79bdec7f516 --- /dev/null +++ b/arch/arm64/include/asm/cpuidle_haltpoll.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_HALTPOLL_H +#define _ASM_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_supported(void) +{ + /* + * Ensure the event stream is available to provide a terminating + * condition to the WFE in the poll loop. + */ + return arch_timer_evtstrm_available(); +} +#endif