From nobody Fri Oct 3 13:32:34 2025 Received: from fanzine2.igalia.com (fanzine2.igalia.com [213.97.179.56]) (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 A7DF4218EA8; Mon, 1 Sep 2025 02:00:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.97.179.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756692042; cv=none; b=NWskaiUswmLkkhgeIGi1v2uhD7OLSirDf75b9F5q6gWDnpQ/5ARFn9Va4CIWFtcJW46HwyseETZtShmx9v2S2gIiho1w0ZQOEfyyulYBCyxerGl5bj3OoZ9lZvIX9iu54nSvlLvFuFpAcB4D0t/2FIXeFptj75cFwqFbrIPJ9I0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756692042; c=relaxed/simple; bh=YzJtKgREI7me3nXsCfQvSwyRWNKrJPREpQJqT4gzfeo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Xz4KujEfh+HybzwDL4BmPcy9P+wZA/5okyJLiZPOeomi43tkBior/1A0cjoSewcTPwsFOR+K+VwttFWd6+SB5CVFwFTEL6cacyYbtwcoIFpR3K7+1/YArwwOukBJv6FQpGv+IR9wfikRe0/g+4DhUSZtj+Lq9Z7LBD1pEKw1IEc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com; spf=pass smtp.mailfrom=igalia.com; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b=j9JiVWWO; arc=none smtp.client-ip=213.97.179.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=igalia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="j9JiVWWO" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=t318W7NevJgtDnAIJPsPhF+OfAPFrrXL/khmfEo3q5M=; b=j9JiVWWOp9Ee2xFtBD4hwUCImM 3Aok3lxH3o7n4vw9+a/5KtCdqLiDg0Ywvkk0HEDgofq/Vxazg0ZJ6itNC++DbfZuF4b041ksu62zF 94QymN2n1dsPDnHx+l9V7Cq4VMyJao/SXnMh4d2AeAishDBbxxe4FCN6LdZVu1b5f+JLGioitLGtm /IIBqvwaTvjYMHsVfWWqUQ6nxgoeIA7j8ZRYAlzmakhJGaljKcAGANAc2JlWu6CxPHL7hijLlCMGd HKMQI2lISici9q/3FRrmZEDhjidIMdKQgfoR0M3Itw4YVTSkiaOckEU4BbN7z+a2FyezmpJk4gHk5 MsHN25Vw==; Received: from [58.29.143.236] (helo=localhost) by fanzine2.igalia.com with utf8esmtpsa (Cipher TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1ustqO-0054To-2w; Mon, 01 Sep 2025 04:00:29 +0200 From: Changwoo Min To: lukasz.luba@arm.com, rafael@kernel.org, len.brown@intel.com, pavel@kernel.org Cc: christian.loehle@arm.com, tj@kernel.org, kernel-dev@igalia.com, linux-pm@vger.kernel.org, sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, Changwoo Min Subject: [PATCH v4 03/10] PM: EM: Add an iterator and accessor for the performance domain Date: Mon, 1 Sep 2025 10:59:56 +0900 Message-ID: <20250901020003.86415-4-changwoo@igalia.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250901020003.86415-1-changwoo@igalia.com> References: <20250901020003.86415-1-changwoo@igalia.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" Add an iterator function (for_each_em_perf_domain) that iterates all the performance domains in the global list. A passed callback function (cb) is called for each performance domain. Additionally, add a lookup function (em_perf_domain_get_by_id) that searches for a performance domain by matching the ID in the global list. Signed-off-by: Changwoo Min --- include/linux/energy_model.h | 15 +++++++++++++++ kernel/power/energy_model.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 49 insertions(+) diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index 2f5c73fcdfe5..ce70e664fcd4 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -341,6 +341,10 @@ struct em_perf_state *em_perf_state_from_pd(struct em_= perf_domain *pd) return rcu_dereference(pd->em_table)->state; } =20 +int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *), + void *data); +struct em_perf_domain *em_perf_domain_get_by_id(int id); + #else struct em_data_callback {}; #define EM_ADV_DATA_CB(_active_power_cb, _cost_cb) { } @@ -410,6 +414,17 @@ int em_update_performance_limits(struct em_perf_domain= *pd, } static inline void em_adjust_cpu_capacity(unsigned int cpu) {} static inline void em_rebuild_sched_domains(void) {} +static inline +int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *), + void *data) +{ + return -EINVAL; +} +static inline +struct em_perf_domain *em_perf_domain_get_by_id(int id) +{ + return NULL; +} #endif =20 #endif diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 6e5e70dbec88..f125262a93c9 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -976,3 +976,37 @@ void em_rebuild_sched_domains(void) */ schedule_work(&rebuild_sd_work); } + +int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *), + void *data) +{ + struct em_perf_domain *pd; + + lockdep_assert_not_held(&em_pd_mutex); + guard(mutex)(&em_pd_list_mutex); + + list_for_each_entry(pd, &em_pd_list, node) { + int ret; + + ret =3D cb(pd, data); + if (ret) + return ret; + } + + return 0; +} + +struct em_perf_domain *em_perf_domain_get_by_id(int id) +{ + struct em_perf_domain *pd; + + lockdep_assert_not_held(&em_pd_mutex); + guard(mutex)(&em_pd_list_mutex); + + list_for_each_entry(pd, &em_pd_list, node) { + if (pd->id =3D=3D id) + return pd; + } + + return NULL; +} --=20 2.51.0