From mboxrd@z Thu Jan 1 00:00:00 1970 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 E05F8C4332F for ; Wed, 1 Dec 2021 16:44:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243835AbhLAQrY (ORCPT ); Wed, 1 Dec 2021 11:47:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351484AbhLAQpu (ORCPT ); Wed, 1 Dec 2021 11:45:50 -0500 Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6EB7C0613F3 for ; Wed, 1 Dec 2021 08:42:10 -0800 (PST) Received: by mail-wr1-x429.google.com with SMTP id d9so32807372wrw.4 for ; Wed, 01 Dec 2021 08:42:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=fWuS4fsoE295izAUB6ZNtsBDKP7xWapSH98WYNQuHlc=; b=Ay4yKRosJ2CxzkELkylu6O/5sX4Qfu+V1v7E8q0MPfybp5BelJwDLgNIUWQT0QHei5 PniowGNWIDW8L8eucD0HdmQimfAvFraCI3IouBxW8ntOmMhfAUOKsye1Q7JBT7fsU6J6 NKhiYCA2SNnjrT+d8HqHXlC5k70+5RZ/w0jZxnYwR9uw3RGQtO8+dQqkH9/7yBND3g36 1cmhDQ3BczN+39FtpMXUh9+/8i1ALFp3W9EWoiCP5h1C+9AamjRjcVJhbVRRf25rZZN4 I45hiZvZl0WfgXG43bdatzEPQHUzdC/U93c+dVgbyQfDiJi6sFzDfYPHGpO4FA1DY9Gy d+/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=fWuS4fsoE295izAUB6ZNtsBDKP7xWapSH98WYNQuHlc=; b=01arWdis1D/VIy0efWF3HRUmOXMfZbonDG/v7kcO53qw650P0FkwFoWJpTFWgAyYNb Td9JT9MsdVN4y4HzJxSxt/tyrPfwx6w8q/cj2mmR+cMropdRkU2p/d+eC2OTM7YJgM46 oZZcpcl2QDHE5hzRziNn24Ev8f72Mng4Zcyx3hdVsa6agu0AjdE2Kh0IvmSUxDIojlbD Nxf6e3HO/KWTsgazBNEoVQvPLzWb0d3Tb2YeDlpRpNWAgSfQG74IpxsOyBqH04N8ArB4 xFRf/M918lmnCgbLyCK26iDDgKqwkz/+7dXeywlD65SyB0YbYAIf1hMj91MMzK+/1fDs zGYA== X-Gm-Message-State: AOAM530f/pbnyDBRsEdGv2baK74JaI1UNX1ixirM2Z7oZuyg9aZ7kb16 GgE2rE0Bu7D+PKoWBFHcp+xX6Q== X-Google-Smtp-Source: ABdhPJx22OOr5XenGVQ3NlQWJJmwfwuCZhl/3T2w2J6h6U6NnlgbF2GDQ3rZ+7cQsPDr430DmjmBcw== X-Received: by 2002:adf:fa04:: with SMTP id m4mr7961898wrr.389.1638376929095; Wed, 01 Dec 2021 08:42:09 -0800 (PST) Received: from localhost.localdomain ([2a01:e34:ed2f:f020:72d0:52a1:d4ea:f564]) by smtp.gmail.com with ESMTPSA id v8sm255547wrd.84.2021.12.01.08.42.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Dec 2021 08:42:08 -0800 (PST) From: Daniel Lezcano To: daniel.lezcano@linaro.org, robh@kernel.org Cc: arnd@linaro.org, heiko@sntech.de, ulf.hansson@linaro.org, rjw@rjwysocki.net, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, lukasz.luba@arm.com, Chanwoo Choi , Kyungmin Park , MyungJoo Ham , "Rafael J. Wysocki" , Daniel Lezcano Subject: [PATCH v3 5/5] powercap/drivers/dtpm: Add dtpm devfreq with energy model support Date: Wed, 1 Dec 2021 17:38:54 +0100 Message-Id: <20211201163856.41419-5-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211201163856.41419-1-daniel.lezcano@linaro.org> References: <20211201163856.41419-1-daniel.lezcano@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently the dtpm supports the CPUs via cpufreq and the energy model. This change provides the same for the device which supports devfreq. Each device supporting devfreq and having an energy model will be added to the hierarchy if the corresponding powerzone is described in the DT. The concept is the same as the cpufreq DTPM support: the QoS is used to aggregate the requests and the energy model gives the value of the instantaneous power consumption ponderated by the load of the device. Cc: Chanwoo Choi Cc: Lukasz Luba Cc: Kyungmin Park Cc: MyungJoo Ham Signed-off-by: Daniel Lezcano --- V2: - Fixed missing prototype warning reported by lkp@ V1: Initial post --- drivers/powercap/Kconfig | 7 ++ drivers/powercap/Makefile | 1 + drivers/powercap/dtpm_devfreq.c | 201 ++++++++++++++++++++++++++++++++ 3 files changed, 209 insertions(+) create mode 100644 drivers/powercap/dtpm_devfreq.c diff --git a/drivers/powercap/Kconfig b/drivers/powercap/Kconfig index b1ca339957e3..515e3ceb3393 100644 --- a/drivers/powercap/Kconfig +++ b/drivers/powercap/Kconfig @@ -57,4 +57,11 @@ config DTPM_CPU help This enables support for CPU power limitation based on energy model. + +config DTPM_DEVFREQ + bool "Add device power capping based on the energy model" + depends on DTPM && ENERGY_MODEL + help + This enables support for device power limitation based on + energy model. endif diff --git a/drivers/powercap/Makefile b/drivers/powercap/Makefile index fabcf388a8d3..494617cdad88 100644 --- a/drivers/powercap/Makefile +++ b/drivers/powercap/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_DTPM) += dtpm.o obj-$(CONFIG_DTPM_CPU) += dtpm_cpu.o +obj-$(CONFIG_DTPM_DEVFREQ) += dtpm_devfreq.o obj-$(CONFIG_POWERCAP) += powercap_sys.o obj-$(CONFIG_INTEL_RAPL_CORE) += intel_rapl_common.o obj-$(CONFIG_INTEL_RAPL) += intel_rapl_msr.o diff --git a/drivers/powercap/dtpm_devfreq.c b/drivers/powercap/dtpm_devfreq.c new file mode 100644 index 000000000000..a1273eb54e80 --- /dev/null +++ b/drivers/powercap/dtpm_devfreq.c @@ -0,0 +1,201 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2021 Linaro Limited + * + * Author: Daniel Lezcano + * + * The devfreq device combined with the energy model and the load can + * give an estimation of the power consumption as well as limiting the + * power. + * + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +struct dtpm_devfreq { + struct dtpm dtpm; + struct dev_pm_qos_request qos_req; + struct devfreq *devfreq; +}; + +static struct dtpm_devfreq *to_dtpm_devfreq(struct dtpm *dtpm) +{ + return container_of(dtpm, struct dtpm_devfreq, dtpm); +} + +static int update_pd_power_uw(struct dtpm *dtpm) +{ + struct dtpm_devfreq *dtpm_devfreq = to_dtpm_devfreq(dtpm); + struct devfreq *devfreq = dtpm_devfreq->devfreq; + struct device *dev = devfreq->dev.parent; + struct em_perf_domain *pd = em_pd_get(dev); + + dtpm->power_min = pd->table[0].power; + dtpm->power_min *= MICROWATT_PER_MILLIWATT; + + dtpm->power_max = pd->table[pd->nr_perf_states - 1].power; + dtpm->power_max *= MICROWATT_PER_MILLIWATT; + + return 0; +} + +static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit) +{ + struct dtpm_devfreq *dtpm_devfreq = to_dtpm_devfreq(dtpm); + struct devfreq *devfreq = dtpm_devfreq->devfreq; + struct device *dev = devfreq->dev.parent; + struct em_perf_domain *pd = em_pd_get(dev); + unsigned long freq; + u64 power; + int i; + + for (i = 0; i < pd->nr_perf_states; i++) { + + power = pd->table[i].power * MICROWATT_PER_MILLIWATT; + if (power > power_limit) + break; + } + + freq = pd->table[i - 1].frequency; + + dev_pm_qos_update_request(&dtpm_devfreq->qos_req, freq); + + power_limit = pd->table[i - 1].power * MICROWATT_PER_MILLIWATT; + + return power_limit; +} + +static void _normalize_load(struct devfreq_dev_status *status) +{ + if (status->total_time > 0xfffff) { + status->total_time >>= 10; + status->busy_time >>= 10; + } + + status->busy_time <<= 10; + status->busy_time /= status->total_time ? : 1; + + status->busy_time = status->busy_time ? : 1; + status->total_time = 1024; +} + +static u64 get_pd_power_uw(struct dtpm *dtpm) +{ + struct dtpm_devfreq *dtpm_devfreq = to_dtpm_devfreq(dtpm); + struct devfreq *devfreq = dtpm_devfreq->devfreq; + struct device *dev = devfreq->dev.parent; + struct em_perf_domain *pd = em_pd_get(dev); + struct devfreq_dev_status status; + unsigned long freq; + u64 power; + int i; + + mutex_lock(&devfreq->lock); + status = devfreq->last_status; + mutex_unlock(&devfreq->lock); + + freq = DIV_ROUND_UP(status.current_frequency, HZ_PER_KHZ); + _normalize_load(&status); + + for (i = 0; i < pd->nr_perf_states; i++) { + + if (pd->table[i].frequency < freq) + continue; + + power = pd->table[i].power * MICROWATT_PER_MILLIWATT; + power *= status.busy_time; + power >>= 10; + + return power; + } + + return 0; +} + +static void pd_release(struct dtpm *dtpm) +{ + struct dtpm_devfreq *dtpm_devfreq = to_dtpm_devfreq(dtpm); + + if (dev_pm_qos_request_active(&dtpm_devfreq->qos_req)) + dev_pm_qos_remove_request(&dtpm_devfreq->qos_req); + + kfree(dtpm_devfreq); +} + +static struct dtpm_ops dtpm_ops = { + .set_power_uw = set_pd_power_limit, + .get_power_uw = get_pd_power_uw, + .update_power_uw = update_pd_power_uw, + .release = pd_release, +}; + +static int __dtpm_devfreq_setup(struct devfreq *devfreq, struct dtpm *parent) +{ + struct device *dev = devfreq->dev.parent; + struct dtpm_devfreq *dtpm_devfreq; + struct em_perf_domain *pd; + int ret = -ENOMEM; + + pd = em_pd_get(dev); + if (!pd) { + ret = dev_pm_opp_of_register_em(dev, NULL); + if (ret) { + pr_err("No energy model available for '%s'\n", dev_name(dev)); + return -EINVAL; + } + } + + dtpm_devfreq = kzalloc(sizeof(*dtpm_devfreq), GFP_KERNEL); + if (!dtpm_devfreq) + return -ENOMEM; + + dtpm_init(&dtpm_devfreq->dtpm, &dtpm_ops); + + dtpm_devfreq->devfreq = devfreq; + + ret = dtpm_register(dev_name(dev), &dtpm_devfreq->dtpm, parent); + if (ret) { + pr_err("Failed to register '%s': %d\n", dev_name(dev), ret); + goto out_dtpm_devfreq; + } + + ret = dev_pm_qos_add_request(dev, &dtpm_devfreq->qos_req, + DEV_PM_QOS_MAX_FREQUENCY, + PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); + if (ret) { + pr_err("Failed to add QoS request: %d\n", ret); + goto out_dtpm_unregister; + } + + dtpm_update_power(&dtpm_devfreq->dtpm); + + return 0; + +out_dtpm_unregister: + dtpm_unregister(&dtpm_devfreq->dtpm); +out_dtpm_devfreq: + kfree(dtpm_devfreq); + + return ret; +} + +static int __init dtpm_devfreq_setup(struct dtpm *dtpm, struct device_node *np) +{ + struct devfreq *devfreq; + + devfreq = devfreq_get_devfreq_by_node(np); + if (IS_ERR(devfreq)) + return 0; + + return __dtpm_devfreq_setup(devfreq, dtpm); +} + +DTPM_DECLARE(dtpm_dev, NULL, dtpm_devfreq_setup); -- 2.25.1