From patchwork Mon Dec 11 10:48:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Guittot X-Patchwork-Id: 753139 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="qj1GFzWv" Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43E4EFD for ; Mon, 11 Dec 2023 02:49:12 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id ffacd0b85a97d-3333224c7b9so3887740f8f.1 for ; Mon, 11 Dec 2023 02:49:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1702291750; x=1702896550; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=6V6LIzUAXzb5BL08HqwkJPBgxnsjRK4GddTVrypvmVk=; b=qj1GFzWv8wZWY6Ha3CFIljKjyBfKp+5L/pQ41TMMt+wQEgeLjUn3aaKKUXDveK1umL egu6juJARo/WdUaH+blsdJWrzNxd6+crQBRf1AgjDMDa/RnDkfVkFtE716kONbBh3J+c 7qjjHqZbiHhgaxZN2XjXbE6kco7BtnWm0vrrTaPSeSlr49avksDHs1HigzFKW4dWqXve 67aQLPDKq2RhjdT7NhPTVwdH/3RlWhiYY+o31ELN3DLTNNJLGUJLtWc4EUxneYeui0/k fr0M3ifNz5MQAMesQd2txxPN2hjGVsWloY6hZB82EYev+WcxNQ6MivQLRjnlVr95gUWN lFmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702291750; x=1702896550; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=6V6LIzUAXzb5BL08HqwkJPBgxnsjRK4GddTVrypvmVk=; b=C7Bi1XPZEaBe6BbYSqTfagm4eBAApBs2608v5FmrMAgZzsHIlhB2gNBmoKUXlwVZ6q 4RRJZwotXx4TKeT0c9WPMR2o+ns/lAyFA4ltuLPu9TYANe7jMozWg9W2LlrnpAbI1Cnh +ETFTji3zwLBTzQ5UvKka8EUhmT3FXsKArdbmgfejhZyRJ6HSOcnDovR/p3ntNnJMxv+ xMViJDIs6z6MqGx29f+8yzkirceAqo3Tyf6oOnrHd7PhxtIuzNsiHixX4c+PthiNOsnJ +n9Qmnvd2QBi20FVkctFY3iFG8nqEFRutH548vh11FCDOZGnyL0xBKli32uPwTZlo14A 281A== X-Gm-Message-State: AOJu0Yx3znha0OwUHrVJR3n3UoBXbH0wIWEwUr90Fe8pZ+yTc4zfFt7d P5hPhBrOv05fPHExfncw9eaY9A== X-Google-Smtp-Source: AGHT+IGYx85T9d3mj2NLigHnw/XFyPjUhFDWEuy7elLTTC11S17Dff81w9bkHFCujY6E4DeXXyzW/A== X-Received: by 2002:adf:e98f:0:b0:333:145b:dbea with SMTP id h15-20020adfe98f000000b00333145bdbeamr2508847wrm.51.1702291750254; Mon, 11 Dec 2023 02:49:10 -0800 (PST) Received: from vingu-book.. ([2a01:e0a:f:6020:a8d:abc:f0ae:3066]) by smtp.gmail.com with ESMTPSA id e16-20020adffd10000000b003346db01263sm8232579wrr.104.2023.12.11.02.49.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Dec 2023 02:49:09 -0800 (PST) From: Vincent Guittot To: linux@armlinux.org.uk, catalin.marinas@arm.com, will@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, sudeep.holla@arm.com, gregkh@linuxfoundation.org, rafael@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, viresh.kumar@linaro.org, lenb@kernel.org, robert.moore@intel.com, lukasz.luba@arm.com, ionela.voinescu@arm.com, pierre.gondois@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org Cc: conor.dooley@microchip.com, suagrfillet@gmail.com, ajones@ventanamicro.com, lftan@kernel.org, beata.michalska@arm.com, Vincent Guittot Subject: [PATCH v7 7/7] arm64/amu: Use capacity_ref_freq to set AMU ratio Date: Mon, 11 Dec 2023 11:48:55 +0100 Message-Id: <20231211104855.558096-8-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231211104855.558096-1-vincent.guittot@linaro.org> References: <20231211104855.558096-1-vincent.guittot@linaro.org> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Use the new capacity_ref_freq to set the ratio that is used by AMU for computing the arch_scale_freq_capacity(). This helps to keep everything aligned using the same reference for computing CPUs capacity. The default value of the ratio (stored in per_cpu(arch_max_freq_scale)) ensures that arch_scale_freq_capacity() returns max capacity until it is set to its correct value with the cpu capacity and capacity_ref_freq. Signed-off-by: Vincent Guittot Acked-by: Sudeep Holla Acked-by: Will Deacon --- arch/arm64/kernel/topology.c | 26 +++++++++++++------------- drivers/base/arch_topology.c | 12 +++++++++++- include/linux/arch_topology.h | 1 + 3 files changed, 25 insertions(+), 14 deletions(-) diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index 817d788cd866..1a2c72f3e7f8 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -82,7 +82,12 @@ int __init parse_acpi_topology(void) #undef pr_fmt #define pr_fmt(fmt) "AMU: " fmt -static DEFINE_PER_CPU_READ_MOSTLY(unsigned long, arch_max_freq_scale); +/* + * Ensure that amu_scale_freq_tick() will return SCHED_CAPACITY_SCALE until + * the CPU capacity and its associated frequency have been correctly + * initialized. + */ +static DEFINE_PER_CPU_READ_MOSTLY(unsigned long, arch_max_freq_scale) = 1UL << (2 * SCHED_CAPACITY_SHIFT); static DEFINE_PER_CPU(u64, arch_const_cycles_prev); static DEFINE_PER_CPU(u64, arch_core_cycles_prev); static cpumask_var_t amu_fie_cpus; @@ -112,14 +117,14 @@ static inline bool freq_counters_valid(int cpu) return true; } -static int freq_inv_set_max_ratio(int cpu, u64 max_rate, u64 ref_rate) +void freq_inv_set_max_ratio(int cpu, u64 max_rate) { - u64 ratio; + u64 ratio, ref_rate = arch_timer_get_rate(); if (unlikely(!max_rate || !ref_rate)) { - pr_debug("CPU%d: invalid maximum or reference frequency.\n", + WARN_ONCE(1, "CPU%d: invalid maximum or reference frequency.\n", cpu); - return -EINVAL; + return; } /* @@ -139,12 +144,10 @@ static int freq_inv_set_max_ratio(int cpu, u64 max_rate, u64 ref_rate) ratio = div64_u64(ratio, max_rate); if (!ratio) { WARN_ONCE(1, "Reference frequency too low.\n"); - return -EINVAL; + return; } - per_cpu(arch_max_freq_scale, cpu) = (unsigned long)ratio; - - return 0; + WRITE_ONCE(per_cpu(arch_max_freq_scale, cpu), (unsigned long)ratio); } static void amu_scale_freq_tick(void) @@ -195,10 +198,7 @@ static void amu_fie_setup(const struct cpumask *cpus) return; for_each_cpu(cpu, cpus) { - if (!freq_counters_valid(cpu) || - freq_inv_set_max_ratio(cpu, - cpufreq_get_hw_max_freq(cpu) * 1000ULL, - arch_timer_get_rate())) + if (!freq_counters_valid(cpu)) return; } diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c index 0a2e43728286..0906114963ff 100644 --- a/drivers/base/arch_topology.c +++ b/drivers/base/arch_topology.c @@ -344,6 +344,10 @@ bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu) return !ret; } +void __weak freq_inv_set_max_ratio(int cpu, u64 max_rate) +{ +} + #ifdef CONFIG_ACPI_CPPC_LIB #include @@ -381,6 +385,9 @@ void topology_init_cpu_capacity_cppc(void) } for_each_possible_cpu(cpu) { + freq_inv_set_max_ratio(cpu, + per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ); + capacity = raw_capacity[cpu]; capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT, capacity_scale); @@ -422,8 +429,11 @@ init_cpu_capacity_callback(struct notifier_block *nb, cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus); - for_each_cpu(cpu, policy->related_cpus) + for_each_cpu(cpu, policy->related_cpus) { per_cpu(capacity_freq_ref, cpu) = policy->cpuinfo.max_freq; + freq_inv_set_max_ratio(cpu, + per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ); + } if (cpumask_empty(cpus_to_visit)) { topology_normalize_cpu_scale(); diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h index 32c24ff4f2a8..a63d61ca55af 100644 --- a/include/linux/arch_topology.h +++ b/include/linux/arch_topology.h @@ -99,6 +99,7 @@ void update_siblings_masks(unsigned int cpu); void remove_cpu_topology(unsigned int cpuid); void reset_cpu_topology(void); int parse_acpi_topology(void); +void freq_inv_set_max_ratio(int cpu, u64 max_rate); #endif #endif /* _LINUX_ARCH_TOPOLOGY_H_ */