From patchwork Fri Mar 22 10:32:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Luba X-Patchwork-Id: 13599939 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 80EB7C54E71 for ; Fri, 22 Mar 2024 10:33:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=FZT+a8jkxvkfXsqFjN0aE+I1L+93HsLM1B3ircs9QXk=; b=qt6YcRZNjQivpJ Jfb6SyJxM1lSgpV3DHl3UDR/cZNKitppjxiY7lzvUNEVmS3g+lML0HL1I92aaBLrjbTuBQlmCwk6L 1l7NA5MMInhSxAUckGeWwBB85ZK7XnJCZ124d7ZpmbFg/Z2CMxqHRajLZ0Zf1bXwtxHMnJ424z6Iq Bb7bvGUXIfuEbTGbQGDSTVDWlW7+/s2LhhVTVD1CqMnH8iwKjh5L0ntQzjusGbll2j0i7T7lWQXKq cMoLb7FVYHkICHmvTIPWRVp7BwIXArtwFoAT676lOcrAXN/ap29RH8Buc0xjTN/LvvYmZPcACLCeH ZqdQFkZTtOjpsu1W3e7w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rncCr-00000006niS-3Yzl; Fri, 22 Mar 2024 10:33:01 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rncCc-00000006nZJ-0v27 for linux-arm-kernel@lists.infradead.org; Fri, 22 Mar 2024 10:32:47 +0000 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 94EC81063; Fri, 22 Mar 2024 03:33:16 -0700 (PDT) Received: from e129166.arm.com (unknown [10.57.71.57]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 140EA3F64C; Fri, 22 Mar 2024 03:32:39 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com, linux-arm-kernel@lists.infradead.org, sboyd@kernel.org, nm@ti.com, linux-samsung-soc@vger.kernel.org, daniel.lezcano@linaro.org, rafael@kernel.org, viresh.kumar@linaro.org, krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, m.szyprowski@samsung.com, mhiramat@kernel.org Subject: [PATCH v2 3/4] PM: EM: Add em_dev_update_chip_binning() Date: Fri, 22 Mar 2024 10:32:20 +0000 Message-Id: <20240322103221.47594-4-lukasz.luba@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240322103221.47594-1-lukasz.luba@arm.com> References: <20240322103221.47594-1-lukasz.luba@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240322_033246_366058_95D464E9 X-CRM114-Status: GOOD ( 16.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a function which allows to modify easily the EM after the new voltage information is available. The device drivers for the chip can adjust the voltage values after setup. The voltage for the same frequency in OPP can be different due to chip binning. The voltage impacts the power usage and the EM power values can be updated to reflect that. Signed-off-by: Lukasz Luba --- include/linux/energy_model.h | 5 ++++ kernel/power/energy_model.c | 51 ++++++++++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+) diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index 770755df852f1..d30d67c2f07cf 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -172,6 +172,7 @@ struct em_perf_table __rcu *em_table_alloc(struct em_perf_domain *pd); void em_table_free(struct em_perf_table __rcu *table); int em_dev_compute_costs(struct device *dev, struct em_perf_state *table, int nr_states); +int em_dev_update_chip_binning(struct device *dev); /** * em_pd_get_efficient_state() - Get an efficient performance state from the EM @@ -387,6 +388,10 @@ int em_dev_compute_costs(struct device *dev, struct em_perf_state *table, { return -EINVAL; } +static inline int em_dev_update_chip_binning(struct device *dev) +{ + return -EINVAL; +} #endif #endif diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 6960dd7393b2d..1494a909844a4 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -808,3 +808,54 @@ static void em_update_workfn(struct work_struct *work) { em_check_capacity_update(); } + +/** + * em_dev_update_chip_binning() - Update Energy Model with new values after + * the new voltage information is present in the OPPs. + * @dev : Device for which the Energy Model has to be updated. + * + * This function allows to update easily the EM with new values available in + * the OPP framework and DT. It can be used after the chip has been properly + * verified by device drivers and the voltages adjusted for the 'chip binning'. + * It uses the "dynamic-power-coefficient" DT property to calculate the power + * values for EM. For power calculation it uses the new adjusted voltage + * values known for OPPs, which might be changed after boot. + */ +int em_dev_update_chip_binning(struct device *dev) +{ + struct em_perf_table __rcu *em_table; + struct em_perf_domain *pd; + int i, ret; + + if (IS_ERR_OR_NULL(dev)) + return -EINVAL; + + pd = em_pd_get(dev); + if (!pd) { + dev_warn(dev, "Couldn't find Energy Model %d\n", ret); + return -EINVAL; + } + + em_table = em_table_dup(pd); + if (!em_table) { + dev_warn(dev, "EM: allocation failed\n"); + return -ENOMEM; + } + + /* Update power values which might change due to new voltage in OPPs */ + for (i = 0; i < pd->nr_perf_states; i++) { + unsigned long freq = em_table->state[i].frequency; + unsigned long power; + + ret = dev_pm_opp_calc_power(dev, &power, &freq); + if (ret) { + em_table_free(em_table); + return ret; + } + + em_table->state[i].power = power; + } + + return em_recalc_and_update(dev, pd, em_table); +} +EXPORT_SYMBOL_GPL(em_dev_update_chip_binning);