From nobody Fri Feb 13 14:11:10 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF36BCE7A97 for ; Mon, 25 Sep 2023 08:12:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232868AbjIYIMF (ORCPT ); Mon, 25 Sep 2023 04:12:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232768AbjIYILl (ORCPT ); Mon, 25 Sep 2023 04:11:41 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 672141AC; Mon, 25 Sep 2023 01:11:34 -0700 (PDT) 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 5E703DA7; Mon, 25 Sep 2023 01:12:12 -0700 (PDT) Received: from e129166.arm.com (unknown [10.57.93.139]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B604D3F5A1; Mon, 25 Sep 2023 01:11:31 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, rafael@kernel.org Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com, rui.zhang@intel.com, amit.kucheria@verdurent.com, amit.kachhap@gmail.com, daniel.lezcano@linaro.org, viresh.kumar@linaro.org, len.brown@intel.com, pavel@ucw.cz, mhiramat@kernel.org, qyousef@layalina.io, wvw@google.com Subject: [PATCH v4 08/18] PM: EM: Add update_power() callback for runtime modifications Date: Mon, 25 Sep 2023 09:11:29 +0100 Message-Id: <20230925081139.1305766-9-lukasz.luba@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230925081139.1305766-1-lukasz.luba@arm.com> References: <20230925081139.1305766-1-lukasz.luba@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The Energy Model (EM) is going to support runtime modifications. This new callback would be used in the upcoming EM changes. The drivers or frameworks which want to modify the EM have to implement the update_power() callback. Signed-off-by: Lukasz Luba --- include/linux/energy_model.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index d236e08e80dc..546dee90f716 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -168,6 +168,26 @@ struct em_data_callback { */ int (*get_cost)(struct device *dev, unsigned long freq, unsigned long *cost); + + /** + * update_power() - Provide new power at the given performance state of + * a device + * @dev : Device for which we do this operation (can be a CPU) + * @freq : Frequency at the performance state in kHz + * @power : New power value at the performance state + * (modified) + * @priv : Pointer to private data useful for tracking context + * during runtime modifications of EM. + * + * The update_power() is used by runtime modifiable EM. It aims to + * provide updated power value for a given frequency, which is stored + * in the performance state. The power value provided by this callback + * should fit in the [0, EM_MAX_POWER] range. + * + * Return 0 on success, or appropriate error value in case of failure. + */ + int (*update_power)(struct device *dev, unsigned long freq, + unsigned long *power, void *priv); }; #define EM_SET_ACTIVE_POWER_CB(em_cb, cb) ((em_cb).active_power =3D cb) #define EM_ADV_DATA_CB(_active_power_cb, _cost_cb) \ @@ -175,6 +195,7 @@ struct em_data_callback { .get_cost =3D _cost_cb } #define EM_DATA_CB(_active_power_cb) \ EM_ADV_DATA_CB(_active_power_cb, NULL) +#define EM_UPDATE_CB(_update_power_cb) { .update_power =3D &_update_power_= cb } =20 struct em_perf_domain *em_cpu_get(int cpu); struct em_perf_domain *em_pd_get(struct device *dev); @@ -331,6 +352,7 @@ struct em_data_callback {}; #define EM_ADV_DATA_CB(_active_power_cb, _cost_cb) { } #define EM_DATA_CB(_active_power_cb) { } #define EM_SET_ACTIVE_POWER_CB(em_cb, cb) do { } while (0) +#define EM_UPDATE_CB(_update_cb) { } =20 static inline int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, --=20 2.25.1