From nobody Fri Dec 19 11:49:59 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 04B913128AF; Mon, 8 Dec 2025 10:59:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765191588; cv=none; b=LLZ/Rkfje9hjby3Gq2C19ZsUvnwH5FaNlqGeUj7Xxx4ABqtS7OCLr0QCFuAHYI0RNhQ7RB2JzcI8p38Wa/0s4omzIiIuAzPyb8hgzyzghR8OjbHpnCV5UXWNQkusRtwTSKItTrQL93mwKjrD5+KSXo6LcfawiunHAJfowHHELUs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765191588; c=relaxed/simple; bh=gFqpxofy6fTB33BJe3RCrR//sp4Ix4o1dOR4GYxnx+4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZCgNg0NhjgSvtR8eWuwmZLCA7XFvSIWlpECleAWC98uKsOTFMDp5M+Go7d/CgbABkQFRj1os24MnIbUftkGDWmW8M/T1oOZOoy1AILWdsmsU9ZGRUruBMhL3MZgeGMwJK0A+st5Vh6WqZSVVLYys0cr5kscGgXD2jqnVCc6ykAM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 36A31169C; Mon, 8 Dec 2025 02:59:39 -0800 (PST) Received: from e135073.arm.com (unknown [10.57.88.207]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 9C26A3F762; Mon, 8 Dec 2025 02:59:43 -0800 (PST) From: Pierre Gondois To: linux-kernel@vger.kernel.org Cc: Christian Loehle , Ionela Voinescu , zhenglifeng1@huawei.com, Jie Zhan , Pierre Gondois , Huang Rui , "Gautham R. Shenoy" , Mario Limonciello , Perry Yuan , "Rafael J. Wysocki" , Viresh Kumar , linux-pm@vger.kernel.org Subject: [PATCH v2 1/3] cpufreq: Add boost_freq_req QoS request Date: Mon, 8 Dec 2025 11:59:26 +0100 Message-ID: <20251208105933.1369125-2-pierre.gondois@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251208105933.1369125-1-pierre.gondois@arm.com> References: <20251208105933.1369125-1-pierre.gondois@arm.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 Content-Type: text/plain; charset="utf-8" The Power Management Quality of Service (PM QoS) allows to aggregate constraints from multiple entities. It is currently used to manage the min/max frequency of a given policy. Frequency constraints can come for instance from: - Thermal framework: acpi_thermal_cpufreq_init() - Firmware: _PPC objects: acpi_processor_ppc_init() - User: by setting policyX/scaling_[min|max]_freq The minimum of the max frequency constraints is used to compute the resulting maximum allowed frequency. When enabling boost frequencies, the same frequency request object (policy->max_freq_req) as to handle requests from users is used. As a result, when setting: - scaling_max_freq - boost The last sysfs file used overwrites the request from the other sysfs file. To avoid this, create a per-policy boost_freq_req to save the boost constraints instead of overwriting the last scaling_max_freq constraint. Signed-off-by: Pierre Gondois --- drivers/cpufreq/cpufreq.c | 28 ++++++++++++++++++++++++++++ include/linux/cpufreq.h | 1 + 2 files changed, 29 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 852e024facc3c..942416f2741b0 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1359,6 +1359,11 @@ static void cpufreq_policy_free(struct cpufreq_polic= y *policy) /* Cancel any pending policy->update work before freeing the policy. */ cancel_work_sync(&policy->update); =20 + if (policy->boost_freq_req) { + freq_qos_remove_request(policy->boost_freq_req); + kfree(policy->boost_freq_req); + } + if (policy->max_freq_req) { /* * Remove max_freq_req after sending CPUFREQ_REMOVE_POLICY @@ -1476,6 +1481,29 @@ static int cpufreq_policy_online(struct cpufreq_poli= cy *policy, goto out_destroy_policy; } =20 + if (policy->boost_supported) { + policy->boost_freq_req =3D kzalloc(sizeof(*policy->boost_freq_req), + GFP_KERNEL); + if (!policy->boost_freq_req) { + ret =3D -ENOMEM; + goto out_destroy_policy; + } + + ret =3D freq_qos_add_request(&policy->constraints, + policy->boost_freq_req, + FREQ_QOS_MAX, + FREQ_QOS_MAX_DEFAULT_VALUE); + if (ret < 0) { + /* + * So we don't call freq_qos_remove_request() for an + * uninitialized request. + */ + kfree(policy->boost_freq_req); + policy->boost_freq_req =3D NULL; + goto out_destroy_policy; + } + } + blocking_notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_CREATE_POLICY, policy); } else { diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 0465d1e6f72ac..c292a6a19e4f5 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -81,6 +81,7 @@ struct cpufreq_policy { struct freq_constraints constraints; struct freq_qos_request *min_freq_req; struct freq_qos_request *max_freq_req; + struct freq_qos_request *boost_freq_req; =20 struct cpufreq_frequency_table *freq_table; enum cpufreq_table_sorting freq_table_sorted; --=20 2.43.0