From patchwork Thu Jan 16 23:12:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 213019 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D46D1C33CB3 for ; Thu, 16 Jan 2020 23:12:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 986512072B for ; Thu, 16 Jan 2020 23:12:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="NR8T0dXf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390027AbgAPXM2 (ORCPT ); Thu, 16 Jan 2020 18:12:28 -0500 Received: from mail-pj1-f67.google.com ([209.85.216.67]:34605 "EHLO mail-pj1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732461AbgAPXM2 (ORCPT ); Thu, 16 Jan 2020 18:12:28 -0500 Received: by mail-pj1-f67.google.com with SMTP id s94so3512241pjc.1 for ; Thu, 16 Jan 2020 15:12:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=jrsnGmD7k4euNniLrflPRPNagVyaAgLcBWPJAW+V44Q=; b=NR8T0dXfdUVUwJqxHxbpqe7dQKDKAShl/Nx238yaSB4fITUPrX/k99w+/SNTUaIEMZ FK6mraGxEGM5MyNmYP+JWWWAHC+1S8s2Up9ze9xrgNw6StM1OwjyB/bO0vDX+LimAZEt Y8nJvJpRQVwb02vL6LBCZ8HsywXP0tuzgdA6A= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=jrsnGmD7k4euNniLrflPRPNagVyaAgLcBWPJAW+V44Q=; b=oNEmnGXV5ByxzXOObW68OCvejJeCWyhw0A34GuxZBHRlyL6SvFc+cfH+8zJqAgodeG zeZ3k/hxeY/+Tt002aTfeQPOuU2YKppfxZEYewuUk5YXyRrEG/fQKIG5/t0wm569lMQV sozRo65m3VzehMpla7cFLA7akPpBRjncosUmmP7LcSy3CF7Q6djmclJTAASZKiK1m4rW q3OpkIBOHEb0ZKCgrsWH8LBDq0OqmR4CMKLg7O2kART/amtlDGEm6iw68XKwrO2ceege zXcBauagzCiGUfQLeyYthoyipzCC94zXaqQUeByWaKNQOu/v46LDSYDbW8AnRyQYcy24 GEpA== X-Gm-Message-State: APjAAAVqSZJFHuTm7hVR+u80ftv5LuwJJRUavq5rZVbi2w98RUgV502L ysrbZIe+ONwlWsXIVig96fz5Zg== X-Google-Smtp-Source: APXvYqx22R84RCDJhB84vPYmaLLC1U7qP0HpuXKmLONtNcIIEF1ZBkCOu85pu3TTuNkcH+psBHl6TA== X-Received: by 2002:a17:90a:b318:: with SMTP id d24mr2165967pjr.142.1579216347569; Thu, 16 Jan 2020 15:12:27 -0800 (PST) Received: from localhost ([2620:15c:202:1:4fff:7a6b:a335:8fde]) by smtp.gmail.com with ESMTPSA id b15sm26703081pft.58.2020.01.16.15.12.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Jan 2020 15:12:26 -0800 (PST) From: Matthias Kaehlcke To: MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Zhang Rui , Daniel Lezcano , Amit Kucheria Cc: Leonard Crestez , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Matthias Kaehlcke , Eduardo Valentin Subject: [PATCH v2] thermal: devfreq_cooling: Use PM QoS to set frequency limits Date: Thu, 16 Jan 2020 15:12:23 -0800 Message-Id: <20200116151219.v2.1.I146403d05b9ec82f48b807efd416a57f545b447a@changeid> X-Mailer: git-send-email 2.25.0.341.g760bfbb309-goog MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Now that devfreq supports limiting the frequency range of a device through PM QoS make use of it instead of disabling OPPs that should not be used. The switch from disabling OPPs to PM QoS introduces a subtle behavioral change in case of conflicting requests (min > max): PM QoS gives precedence to the MIN_FREQUENCY request, while higher OPPs disabled with dev_pm_opp_disable() would override MIN_FREQUENCY. Signed-off-by: Matthias Kaehlcke --- Changes in v2: - added documentation for 'req_max_freq' - fixed jumps in of_devfreq_cooling_register_power() unwind - added comment about behavioral change to the commit message drivers/thermal/devfreq_cooling.c | 70 ++++++++++--------------------- 1 file changed, 23 insertions(+), 47 deletions(-) diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c index ef59256887ff63..cbbaf5bc425d1a 100644 --- a/drivers/thermal/devfreq_cooling.c +++ b/drivers/thermal/devfreq_cooling.c @@ -24,11 +24,13 @@ #include #include #include +#include #include #include -#define SCALE_ERROR_MITIGATION 100 +#define HZ_PER_KHZ 1000 +#define SCALE_ERROR_MITIGATION 100 static DEFINE_IDA(devfreq_ida); @@ -53,6 +55,8 @@ static DEFINE_IDA(devfreq_ida); * 'utilization' (which is 'busy_time / 'total_time'). * The 'res_util' range is from 100 to (power_table[state] * 100) * for the corresponding 'state'. + * @req_max_freq: PM QoS request for limiting the maximum frequency + * of the devfreq device. */ struct devfreq_cooling_device { int id; @@ -65,49 +69,9 @@ struct devfreq_cooling_device { struct devfreq_cooling_power *power_ops; u32 res_util; int capped_state; + struct dev_pm_qos_request req_max_freq; }; -/** - * partition_enable_opps() - disable all opps above a given state - * @dfc: Pointer to devfreq we are operating on - * @cdev_state: cooling device state we're setting - * - * Go through the OPPs of the device, enabling all OPPs until - * @cdev_state and disabling those frequencies above it. - */ -static int partition_enable_opps(struct devfreq_cooling_device *dfc, - unsigned long cdev_state) -{ - int i; - struct device *dev = dfc->devfreq->dev.parent; - - for (i = 0; i < dfc->freq_table_size; i++) { - struct dev_pm_opp *opp; - int ret = 0; - unsigned int freq = dfc->freq_table[i]; - bool want_enable = i >= cdev_state ? true : false; - - opp = dev_pm_opp_find_freq_exact(dev, freq, !want_enable); - - if (PTR_ERR(opp) == -ERANGE) - continue; - else if (IS_ERR(opp)) - return PTR_ERR(opp); - - dev_pm_opp_put(opp); - - if (want_enable) - ret = dev_pm_opp_enable(dev, freq); - else - ret = dev_pm_opp_disable(dev, freq); - - if (ret) - return ret; - } - - return 0; -} - static int devfreq_cooling_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) { @@ -134,7 +98,7 @@ static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, struct devfreq_cooling_device *dfc = cdev->devdata; struct devfreq *df = dfc->devfreq; struct device *dev = df->dev.parent; - int ret; + unsigned long freq; if (state == dfc->cooling_state) return 0; @@ -144,9 +108,10 @@ static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, if (state >= dfc->freq_table_size) return -EINVAL; - ret = partition_enable_opps(dfc, state); - if (ret) - return ret; + freq = dfc->freq_table[state]; + + dev_pm_qos_update_request(&dfc->req_max_freq, + DIV_ROUND_UP(freq, HZ_PER_KHZ)); dfc->cooling_state = state; @@ -529,9 +494,15 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, if (err) goto free_dfc; - err = ida_simple_get(&devfreq_ida, 0, 0, GFP_KERNEL); + err = dev_pm_qos_add_request(df->dev.parent, &dfc->req_max_freq, + DEV_PM_QOS_MAX_FREQUENCY, + PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); if (err < 0) goto free_tables; + + err = ida_simple_get(&devfreq_ida, 0, 0, GFP_KERNEL); + if (err < 0) + goto remove_qos_req; dfc->id = err; snprintf(dev_name, sizeof(dev_name), "thermal-devfreq-%d", dfc->id); @@ -552,6 +523,10 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, release_ida: ida_simple_remove(&devfreq_ida, dfc->id); + +remove_qos_req: + dev_pm_qos_remove_request(&dfc->req_max_freq); + free_tables: kfree(dfc->power_table); kfree(dfc->freq_table); @@ -600,6 +575,7 @@ void devfreq_cooling_unregister(struct thermal_cooling_device *cdev) thermal_cooling_device_unregister(dfc->cdev); ida_simple_remove(&devfreq_ida, dfc->id); + dev_pm_qos_remove_request(&dfc->req_max_freq); kfree(dfc->power_table); kfree(dfc->freq_table);