From nobody Sun Oct 5 10:51:21 2025 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A27B02741D6; Tue, 5 Aug 2025 09:33:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754386439; cv=none; b=Zxzm1M9pCokbxCTsZ2YNLJc9QiBYuoV1sBw2eWBIjgbazfzwDy/r0QMjgjKquaUrEiCC5vghYL9YAcLWdDMHe61y4JS2N4bNV3rV5rZagFOLQ2l/KL5h7+rquRoKhipDpNBqUlQNKCdmAdoI+uErWQDMvOoI7SixO9uDtQSx7L4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754386439; c=relaxed/simple; bh=XQ4eBg80a96FV2MZDPzFeGhY4E98depsJi9EaPWmjxM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=aRQ+Ms05XcFYD1zdKGgB5Gcyt723x3VKl9Z6k7JT/0ki1jj75LILSUvtOEmxGLNz30HQruhzsYC49md4I3pB81T3l886TXCiE0qPWuvGIZYdVRAAVpzv/Elyf1gVePipAzCdG1zGswoK6UqUhLsyuD3UxGGNld+areFZnkVoItk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.254]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4bx7Sx0lZpz13Myh; Tue, 5 Aug 2025 17:30:41 +0800 (CST) Received: from kwepemh100008.china.huawei.com (unknown [7.202.181.93]) by mail.maildlp.com (Postfix) with ESMTPS id E4994180483; Tue, 5 Aug 2025 17:33:54 +0800 (CST) Received: from localhost.localdomain (10.50.165.33) by kwepemh100008.china.huawei.com (7.202.181.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 5 Aug 2025 17:33:54 +0800 From: Lifeng Zheng To: , , , , , CC: , , , , , , , , , , , Subject: [PATCH v3 1/3] arm64: topology: Set scale freq source only for the CPUs that have not been set before Date: Tue, 5 Aug 2025 17:33:28 +0800 Message-ID: <20250805093330.3715444-2-zhenglifeng1@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250805093330.3715444-1-zhenglifeng1@huawei.com> References: <20250805093330.3715444-1-zhenglifeng1@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: kwepems200001.china.huawei.com (7.221.188.67) To kwepemh100008.china.huawei.com (7.202.181.93) Content-Type: text/plain; charset="utf-8" The scale freq source of the CPUs in 'amu_fie_cpus' mask are already set to AMU tick before, so in amu_fie_setup(), only the CPUs in the 'cpus' mask should be set. Signed-off-by: Lifeng Zheng --- arch/arm64/kernel/topology.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index 5d07ee85bdae..9317a618bb87 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -373,7 +373,7 @@ static void amu_fie_setup(const struct cpumask *cpus) =20 cpumask_or(amu_fie_cpus, amu_fie_cpus, cpus); =20 - topology_set_scale_freq_source(&amu_sfd, amu_fie_cpus); + topology_set_scale_freq_source(&amu_sfd, cpus); =20 pr_debug("CPUs[%*pbl]: counters will be used for FIE.", cpumask_pr_args(cpus)); --=20 2.33.0 From nobody Sun Oct 5 10:51:21 2025 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 36B9A134AC; Tue, 5 Aug 2025 09:50:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.188 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754387405; cv=none; b=nNAPxZzKwv7A+lSuLzyXp49gOcxArRwOXmp1RzEQl4OHHBL6l9UfXNRRG3AmN5TErMZfcYNynufQoe8+l9XuZzyy1gmW+ORsOtRQkDlf35bcUvIWIaytRkZ0Zd9lIq3B9mAgnn4FokpOQ2Qu1NgjUG224m4354ESjxq8+HPpjEY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754387405; c=relaxed/simple; bh=6eWyVpAc/QfWc34CSdfh79LUKhYOhNepT0ayCZ8yrpo=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Gd+OSooEYBfIaWxS3P7oMJXr6W4fjg1O9CdPTTHHiyPwH0dt1C6/V7JQbvA3E+/sUXQYVFFNdMFu4lJp1DLcylhKxSo4Y+r2wY4hYb2YV0akIjh52Pu0kWBLN4LesvECdKyTwcXEXE5JojzYXni1S1asqTHcE/lrqeimUk3m6HE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.48]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4bx7WV0FSlztQSP; Tue, 5 Aug 2025 17:32:54 +0800 (CST) Received: from kwepemh100008.china.huawei.com (unknown [7.202.181.93]) by mail.maildlp.com (Postfix) with ESMTPS id A44F118006C; Tue, 5 Aug 2025 17:33:55 +0800 (CST) Received: from localhost.localdomain (10.50.165.33) by kwepemh100008.china.huawei.com (7.202.181.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 5 Aug 2025 17:33:54 +0800 From: Lifeng Zheng To: , , , , , CC: , , , , , , , , , , , Subject: [PATCH v3 2/3] cpufreq: Add a new function to get cpufreq policy without checking if the CPU is online Date: Tue, 5 Aug 2025 17:33:29 +0800 Message-ID: <20250805093330.3715444-3-zhenglifeng1@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250805093330.3715444-1-zhenglifeng1@huawei.com> References: <20250805093330.3715444-1-zhenglifeng1@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: kwepems200001.china.huawei.com (7.221.188.67) To kwepemh100008.china.huawei.com (7.202.181.93) Content-Type: text/plain; charset="utf-8" cpufreq_cpu_get_raw() gets cpufreq policy only if the CPU is in policy->cpus mask, which means the CPU is already online. But in some cases, the policy is needed before the CPU is added to cpus mask. Add a function to get the policy in these cases. Signed-off-by: Lifeng Zheng --- drivers/cpufreq/cpufreq.c | 11 +++++++++++ include/linux/cpufreq.h | 1 + 2 files changed, 12 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index fc7eace8b65b..2de76a072893 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -198,6 +198,17 @@ struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned in= t cpu) } EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw); =20 +struct cpufreq_policy *cpufreq_cpu_get_raw_no_check(unsigned int cpu) +{ + struct cpufreq_policy *policy =3D per_cpu(cpufreq_cpu_data, cpu); + + if (policy) + return policy; + + return NULL; +} +EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw_no_check); + unsigned int cpufreq_generic_get(unsigned int cpu) { struct cpufreq_policy *policy =3D cpufreq_cpu_get_raw(cpu); diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 95f3807c8c55..02ad8173dc10 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -205,6 +205,7 @@ struct cpufreq_freqs { =20 #ifdef CONFIG_CPU_FREQ struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); +struct cpufreq_policy *cpufreq_cpu_get_raw_no_check(unsigned int cpu); struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); void cpufreq_cpu_put(struct cpufreq_policy *policy); #else --=20 2.33.0 From nobody Sun Oct 5 10:51:21 2025 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4BA11275AE4; Tue, 5 Aug 2025 09:33:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754386440; cv=none; b=udrJt/A8qNsu/RMPoIZZCX4gLUkFdMTO+surPIWwpQ9+Xrkpz4pPLPAR4Zy2ERRGpd3XiH2xNoMSukWoupEilSBexQwhXkI/DXkqwii3PW/hmJG9JH7mYOh0xbimUyzZxNq0zO45NUNKYNbaHQMoEQImcF1ZGiEwXSQjwxSWKj4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754386440; c=relaxed/simple; bh=Eb3zE1SSn6G9eqw7OXG6AQfEBTShxrMQqk15ZC6DN+Y=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=gIuaYba7ZqeyCI8BqvyhfOF1qnY8i6e84tM1I97OOjQaU3GhMHiZZTcILCbQIx+gsr6Wz4VGC5Jb+xCO+qktiKiUlulpH1prJN0fGsreb1Qj4ecOjG98itRKz6+Z1PLdt9QnnHIaWorqmhi9m9hBwmZzjagCz+dM6gCnGLWUC10= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.194]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4bx7R04JPTz14LrS; Tue, 5 Aug 2025 17:29:00 +0800 (CST) Received: from kwepemh100008.china.huawei.com (unknown [7.202.181.93]) by mail.maildlp.com (Postfix) with ESMTPS id 6190B1401F3; Tue, 5 Aug 2025 17:33:56 +0800 (CST) Received: from localhost.localdomain (10.50.165.33) by kwepemh100008.china.huawei.com (7.202.181.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 5 Aug 2025 17:33:55 +0800 From: Lifeng Zheng To: , , , , , CC: , , , , , , , , , , , Subject: [PATCH v3 3/3] arm64: topology: Setup AMU FIE for online CPUs only Date: Tue, 5 Aug 2025 17:33:30 +0800 Message-ID: <20250805093330.3715444-4-zhenglifeng1@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250805093330.3715444-1-zhenglifeng1@huawei.com> References: <20250805093330.3715444-1-zhenglifeng1@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: kwepems200001.china.huawei.com (7.221.188.67) To kwepemh100008.china.huawei.com (7.202.181.93) Content-Type: text/plain; charset="utf-8" When boot with maxcpu=3D1 restrict, and LPI(Low Power Idle States) is on, only CPU0 will go online. The support AMU flag of CPU0 will be set but the flags of other CPUs will not. This will cause AMU FIE set up fail for CPU0 when it shares a cpufreq policy with other CPU(s). After that, when other CPUs are finally online and the support AMU flags of them are set, they'll never have a chance to set up AMU FIE, even though they're eligible. To solve this problem, the process of setting up AMU FIE needs to be modified as follows: 1. Set up AMU FIE only for the online CPUs. 2. Try to set up AMU FIE each time a CPU goes online and do the freq_counters_valid() check. If this check fails, clear scale freq source of all the CPUs related to the same policy, in case they use different source of the freq scale. Signed-off-by: Lifeng Zheng --- arch/arm64/kernel/topology.c | 54 ++++++++++++++++++++++++++++++++++-- 1 file changed, 52 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index 9317a618bb87..b68621b3c071 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -385,7 +385,7 @@ static int init_amu_fie_callback(struct notifier_block = *nb, unsigned long val, struct cpufreq_policy *policy =3D data; =20 if (val =3D=3D CPUFREQ_CREATE_POLICY) - amu_fie_setup(policy->related_cpus); + amu_fie_setup(policy->cpus); =20 /* * We don't need to handle CPUFREQ_REMOVE_POLICY event as the AMU @@ -404,10 +404,60 @@ static struct notifier_block init_amu_fie_notifier = =3D { .notifier_call =3D init_amu_fie_callback, }; =20 +static int cpuhp_topology_online(unsigned int cpu) +{ + struct cpufreq_policy *policy =3D cpufreq_cpu_get_raw_no_check(cpu); + + /* + * If the online CPUs are not all AMU FIE CPUs or the new one is already + * an AMU FIE one, no need to set it. + */ + if (!policy || !cpumask_available(amu_fie_cpus) || + !cpumask_subset(policy->cpus, amu_fie_cpus) || + cpumask_test_cpu(cpu, amu_fie_cpus)) + return 0; + + /* + * If the new online CPU cannot pass this check, all the CPUs related to + * the same policy should be clear from amu_fie_cpus mask, otherwise they + * may use different source of the freq scale. + */ + if (!freq_counters_valid(cpu)) { + topology_clear_scale_freq_source(SCALE_FREQ_SOURCE_ARCH, + policy->related_cpus); + cpumask_andnot(amu_fie_cpus, amu_fie_cpus, policy->related_cpus); + return 0; + } + + cpumask_set_cpu(cpu, amu_fie_cpus); + + topology_set_scale_freq_source(&amu_sfd, cpumask_of(cpu)); + + pr_debug("CPU[%u]: counter will be used for FIE.", cpu); + + return 0; +} + static int __init init_amu_fie(void) { - return cpufreq_register_notifier(&init_amu_fie_notifier, + int ret; + + ret =3D cpufreq_register_notifier(&init_amu_fie_notifier, CPUFREQ_POLICY_NOTIFIER); + if (ret) + return ret; + + ret =3D cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, + "arm64/topology:online", + cpuhp_topology_online, + NULL); + if (ret < 0) { + cpufreq_unregister_notifier(&init_amu_fie_notifier, + CPUFREQ_POLICY_NOTIFIER); + return ret; + } + + return 0; } core_initcall(init_amu_fie); =20 --=20 2.33.0