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Thu, 29 Feb 2024 16:25:30 +0000 From: Vanshidhar Konda To: Huisong Li , Beata Michalska Cc: Vanshidhar Konda , Ionela Voinescu , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, rafael@kernel.org, sumitg@nvidia.com, zengheng4@huawei.com, yang@os.amperecomputing.com, will@kernel.org, sudeep.holla@arm.com, liuyonglong@huawei.com, zhanjie9@hisilicon.com, linux-acpi@vger.kernel.org Subject: [PATCH v1 2/3] arm64: idle: Cache AMU counters before entering idle Date: Thu, 29 Feb 2024 08:25:14 -0800 Message-ID: <20240229162520.970986-3-vanshikonda@os.amperecomputing.com> X-Mailer: git-send-email 2.43.1 In-Reply-To: <20240229162520.970986-1-vanshikonda@os.amperecomputing.com> References: <20240229162520.970986-1-vanshikonda@os.amperecomputing.com> X-ClientProxiedBy: CH2PR04CA0004.namprd04.prod.outlook.com (2603:10b6:610:52::14) To SJ0PR01MB6509.prod.exchangelabs.com (2603:10b6:a03:294::17) 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: SJ0PR01MB6509:EE_|CO1PR01MB7225:EE_ X-MS-Office365-Filtering-Correlation-Id: 0438bab8-55c4-4a1e-4fa0-08dc39430bbc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Saving the value of the core and constant counters prior to invoking WFI allows FIE to compute the frequency of a CPU that is idle. Signed-off-by: Vanshidhar Konda --- arch/arm64/kernel/idle.c | 10 ++++++++++ arch/arm64/kernel/topology.c | 14 ++++++++------ 2 files changed, 18 insertions(+), 6 deletions(-) diff --git a/arch/arm64/kernel/idle.c b/arch/arm64/kernel/idle.c index 05cfb347ec26..5ed2e57188a8 100644 --- a/arch/arm64/kernel/idle.c +++ b/arch/arm64/kernel/idle.c @@ -26,6 +26,16 @@ void __cpuidle cpu_do_idle(void) arm_cpuidle_save_irq_context(&context); +#ifdef CONFIG_ARM64_AMU_EXTN + /* Update the AMU counters before entering WFI. The cached AMU counter + * value is used to determine CPU frequency while the CPU is idle + * without needing to wake up the CPU. + */ + + if (cpu_has_amu_feat(smp_processor_id())) + update_freq_counters_refs(); +#endif + dsb(sy); wfi(); diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index db8d14525cf4..8905eb0c681f 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -240,13 +240,15 @@ unsigned int arch_freq_get_on_cpu(int cpu) } while (read_seqcount_retry(&cpu_sample->seq, seq)); /* - * Bail on invalid count and when the last update was too long ago, - * which covers idle and NOHZ full CPUs. + * Bail on invalid count and when the last update was too long ago. + * This covers idle, NOHZ full and isolated CPUs. + * + * Idle CPUs don't need to be measured because AMU counters stop + * incrementing during WFI/WFE. */ - if (!delta_const_cnt || ((jiffies - last) > MAX_SAMPLE_AGE)) { - if (!(housekeeping_cpu(cpu, HK_TYPE_TICK) && idle_cpu(cpu))) - goto fallback; - } + if (!delta_const_cnt || + ((jiffies - last) > MAX_SAMPLE_AGE && !idle_cpu(cpu))) + goto fallback; /* * CPU frequency = reference perf (in Hz) * (/\ delivered) / (/\ reference)