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 BBB71C4332F for ; Wed, 24 Nov 2021 14:28:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344716AbhKXObQ (ORCPT ); Wed, 24 Nov 2021 09:31:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348208AbhKXObA (ORCPT ); Wed, 24 Nov 2021 09:31:00 -0500 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 51064C127934 for ; Wed, 24 Nov 2021 04:55:26 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id c4so4008135wrd.9 for ; Wed, 24 Nov 2021 04:55:26 -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=k/hEs8if+JBSArD6i1apUjdM/A/uvCtQ9h+4BB8S0fQ=; b=eNwhPxlLMifv8cMNbidNd/IVYaT2UEqIhm5jxWK3GhzGAMZ+YY9Szv4QrjJEJ9Moz8 jwa1GKdnw0xmEoomSpRZuGfyA3ueRJ9fCi44TULwHqxceo0QWTx75wiraD3fN3XKUhuz BJkxaiqxdqrXFQRxkmy2o0+AP/UjxwWp3w+VgSzQI/dk8jNBKtHKLXe/NDoApmY+VAxV jbsXwsB0Lxymlph3B71xByp91zEkrxcZ8lXcPJZ3LEtwGiQXF8+WlOKX7Ua63Si87TAy HdoHrn3bdxb/CxxMJ4uJH6Zk3rKdSJ3GrNbhtILWKTpNCvgUIwNLV+ST+orprOb/HLo5 xw5g== 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=k/hEs8if+JBSArD6i1apUjdM/A/uvCtQ9h+4BB8S0fQ=; b=Z1k8JRZkucLLq7BOxMfZJMo3n6ze73PKMZYDZNDeIshFGaqidUKKsM1Qs4fv+Fq5jZ QB527Vxg6IU2PxawJKvBev6GpQjdFmms4t9b0827AMpXzOY80gMDWhPdmfyV9O7X4dbK zUkNZsF2457Fo2gYmiw5xMv/6baE0rTby9EWnjuZNOUeby8BfHwvYW5NVOZxiT76LX/D OwSTxsh2LE9PXly2uZODtYFOgaIDZeYBJoKP2tAXbEP0dugzPYN68L15UaorcobKNScr 3KPCXRTi8voflia0QO3qDrBaN7ZOSM+vss9sHXFWtWRDyCXoHuYwMRFChY3qXDhVkVki e4WQ== X-Gm-Message-State: AOAM532WJCVwqqkVEIWnusVmECZhK9L5WWnKO8U9WaE5Y7ewfxL2xH96 xo1DOKYPcu9kvCdyqsu1BQsYrQ== X-Google-Smtp-Source: ABdhPJwdrtpVHto7ID+th9slZzDql/7Zsx+KKRua5f25dh7B8o/ZVkW1T+ArVn7b/kQowJZlvlhOAA== X-Received: by 2002:a5d:5651:: with SMTP id j17mr18701152wrw.166.1637758524765; Wed, 24 Nov 2021 04:55:24 -0800 (PST) Received: from localhost.localdomain ([2a01:e34:ed2f:f020:3395:9073:b941:501e]) by smtp.gmail.com with ESMTPSA id v8sm14916443wrd.84.2021.11.24.04.55.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Nov 2021 04:55:24 -0800 (PST) From: Daniel Lezcano To: daniel.lezcano@linaro.org Cc: robh@kernel.org, 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 5/5] powercap/drivers/dtpm: Add dtpm devfreq with energy model support Date: Wed, 24 Nov 2021 13:55:04 +0100 Message-Id: <20211124125506.2971069-5-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211124125506.2971069-1-daniel.lezcano@linaro.org> References: <20211124125506.2971069-1-daniel.lezcano@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@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 --- 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..3dfc6b190202 --- /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; +}; + +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