From nobody Thu Oct 2 07:46:28 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 5F07919D8AC; Sun, 21 Sep 2025 03:20:00 +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=1758424802; cv=none; b=UN47qUyeRxdtyBTMXOFsuSbmVCyDRvKgHjMUQng4MPvF8l0RwfUxPKQ4lzso9Rf2MFRZYCftXgzCMrxXafYmg52eoAClg7DYJCnG3ssz9rW1cNjbxL5FcccWRShbtxCoIYLnBCFDJWiEDipx3r+M46OmfRyoEszCBXP/mPH7SE0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758424802; c=relaxed/simple; bh=++DyOH7ugH24cdWoPjX9APMDPkk9z7CzN6Vn9Y7tBDI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bYUmt7GUWnEiJrdnyg4BiFbvfVnnTmjyA/Wcd61pvzd2YHWA7zb+Qo/7skWzDTEUKUPnz00BWxv/uOcIQj7KwmBD5oW9X/u51LRWFDtpLUVHTOZ/jhYNZT5lft5xVLBobZb45qzAZTIv8gzzwh8L1Cq+r8myUXTae9agsTlX3xY= 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=U2oh9fMP; 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="U2oh9fMP" 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=tGdlpJHxujfBfzqdZKtnvcATGt39HpMaCyzFMXZeR7w=; b=U2oh9fMPqXZII/pckcGc+0Yznb sa6Ippk12xdmDxZm6AGmQZmpMe3Ru8NpsHUbVwRSQAwS19pktlq95GSnI++6ET4YfshcsLfm57lFK 5pZbzgwlkISA4AQ/cN/6ZA6P8VIC8O9vpxCUQPmskMaJWdrYxFLdl211B8GfzmNvSGqkX7lCwAHn4 GBNxK5EzuW5KIF0Ap9dFOPjlPsmfcXeVgqVaT7/cuZtr0KTSo9ljE5/M+e1c2GmfeuGqFmkZSnWVP 9M3ZosaVdXC1RXlIlly+zxM8g5o9elsckL3Mdqbsc4M5HwDGr6+MDQmqFupHVE41wDiyEGlnkubJZ ob9DQxrQ==; 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 1v0AcC-00Ech4-1y; Sun, 21 Sep 2025 05:19:53 +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 RESEND v4 03/10] PM: EM: Add an iterator and accessor for the performance domain Date: Sun, 21 Sep 2025 12:19:21 +0900 Message-ID: <20250921031928.205869-4-changwoo@igalia.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250921031928.205869-1-changwoo@igalia.com> References: <20250921031928.205869-1-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 43aa6153dc57..21279e779188 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -344,6 +344,10 @@ 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) { } @@ -420,6 +424,17 @@ 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 8998a7f4910a..740076d24479 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -1000,3 +1000,37 @@ 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