From nobody Thu Nov 14 10:21:56 2024 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 90DB1C433F5 for ; Wed, 16 Mar 2022 23:52:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351867AbiCPXxy (ORCPT ); Wed, 16 Mar 2022 19:53:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351493AbiCPXxs (ORCPT ); Wed, 16 Mar 2022 19:53:48 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 23F961ADBB; Wed, 16 Mar 2022 16:52:33 -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 DA82F1476; Wed, 16 Mar 2022 16:52:32 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.19.225]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 047D23F766; Wed, 16 Mar 2022 16:52:29 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com, Pierre.Gondois@arm.com, ionela.voinescu@arm.com, viresh.kumar@linaro.org, rafael@kernel.org, daniel.lezcano@linaro.org, linux-pm@vger.kernel.org, mka@chromium.org, nm@ti.com, sboyd@kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, cristian.marussi@arm.com, sudeep.holla@arm.com, matthias.bgg@gmail.com Subject: [[PATCH 3/8] PM: EM: Use the new .get_cost() callback while registering EM Date: Wed, 16 Mar 2022 23:52:06 +0000 Message-Id: <20220316235211.29370-4-lukasz.luba@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220316235211.29370-1-lukasz.luba@arm.com> References: <20220316235211.29370-1-lukasz.luba@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The Energy Model (EM) allows to provide the 'cost' values when the device driver provides the .get_cost() optional callback. This removes restriction which is in the EM calculation function of the 'cost' for each performance state. Now, the driver is in charge of providing the right values which are then used by Energy Aware Scheduler. Signed-off-by: Lukasz Luba --- kernel/power/energy_model.c | 39 ++++++++++++++++++++++++++----------- 1 file changed, 28 insertions(+), 11 deletions(-) diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 6ecee99af842..95a3b33001f6 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -121,7 +121,8 @@ static void em_debug_remove_pd(struct device *dev) {} #endif =20 static int em_create_perf_table(struct device *dev, struct em_perf_domain = *pd, - int nr_states, struct em_data_callback *cb) + int nr_states, struct em_data_callback *cb, + unsigned long flags) { unsigned long power, freq, prev_freq =3D 0, prev_cost =3D ULONG_MAX; struct em_perf_state *table; @@ -173,10 +174,22 @@ static int em_create_perf_table(struct device *dev, s= truct em_perf_domain *pd, /* Compute the cost of each performance state. */ fmax =3D (u64) table[nr_states - 1].frequency; for (i =3D nr_states - 1; i >=3D 0; i--) { - unsigned long power_res =3D em_scale_power(table[i].power); + unsigned long power_res, cost; + + if (flags & EM_PERF_DOMAIN_ARTIFICIAL) { + ret =3D cb->get_cost(dev, table[i].frequency, &cost); + if (ret || !cost || cost > EM_MAX_POWER) { + dev_err(dev, "EM: invalid cost %lu %d\n", + cost, ret); + goto free_ps_table; + } + } else { + power_res =3D em_scale_power(table[i].power); + cost =3D div64_u64(fmax * power_res, table[i].frequency); + } + + table[i].cost =3D cost; =20 - table[i].cost =3D div64_u64(fmax * power_res, - table[i].frequency); if (table[i].cost >=3D prev_cost) { table[i].flags =3D EM_PERF_STATE_INEFFICIENT; dev_dbg(dev, "EM: OPP:%lu is inefficient\n", @@ -197,7 +210,8 @@ static int em_create_perf_table(struct device *dev, str= uct em_perf_domain *pd, } =20 static int em_create_pd(struct device *dev, int nr_states, - struct em_data_callback *cb, cpumask_t *cpus) + struct em_data_callback *cb, cpumask_t *cpus, + unsigned long flags) { struct em_perf_domain *pd; struct device *cpu_dev; @@ -215,7 +229,7 @@ static int em_create_pd(struct device *dev, int nr_stat= es, return -ENOMEM; } =20 - ret =3D em_create_perf_table(dev, pd, nr_states, cb); + ret =3D em_create_perf_table(dev, pd, nr_states, cb, flags); if (ret) { kfree(pd); return ret; @@ -332,6 +346,7 @@ int em_dev_register_perf_domain(struct device *dev, uns= igned int nr_states, bool milliwatts) { unsigned long cap, prev_cap =3D 0; + unsigned long flags =3D 0; int cpu, ret; =20 if (!dev || !nr_states || !cb) @@ -378,14 +393,16 @@ int em_dev_register_perf_domain(struct device *dev, u= nsigned int nr_states, } } =20 - ret =3D em_create_pd(dev, nr_states, cb, cpus); + if (milliwatts) + flags |=3D EM_PERF_DOMAIN_MILLIWATTS; + else if (cb->get_cost) + flags |=3D EM_PERF_DOMAIN_ARTIFICIAL; + + ret =3D em_create_pd(dev, nr_states, cb, cpus, flags); if (ret) goto unlock; =20 - if (milliwatts) - dev->em_pd->flags |=3D EM_PERF_DOMAIN_MILLIWATTS; - else if (cb->get_cost) - dev->em_pd->flags |=3D EM_PERF_DOMAIN_ARTIFICIAL; + dev->em_pd->flags |=3D flags; =20 em_cpufreq_update_efficiencies(dev); =20 --=20 2.17.1