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Mon, 9 Dec 2019 14:44:41 +0000 (GMT) From: Kamil Konieczny To: k.konieczny@samsung.com Cc: Bartlomiej Zolnierkiewicz , Chanwoo Choi , Krzysztof Kozlowski , Kyungmin Park , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Marek Szyprowski , MyungJoo Ham Subject: [PATCH 2/4] PM / devfreq: add possibility for delayed work Date: Mon, 9 Dec 2019 15:44:23 +0100 Message-Id: <20191209144425.13321-3-k.konieczny@samsung.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191209144425.13321-1-k.konieczny@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLKsWRmVeSWpSXmKPExsWy7djPc7q3Yt/FGuy4w2yxccZ6VovrX56z Wiz4NIPV4vz5DewWZ5vesFtc3jWHzeJz7xFGi7VH7rJb3G5cwebA6bFpVSebR9+WVYwenzfJ BTBHcdmkpOZklqUW6dslcGU8nrWUtWClakXPnedsDYwt8l2MnBwSAiYSe+dPZ+9i5OIQEljB KNFxbSojhPOFUWLLks2sEM5nRonF9y4zw7QcvfeHEcQWEljOKHFlgTBcx+HVX1lAEmwC+hIH z54Es0UEpCU6F01kAiliFjjGJLHr0F9WkISwgLPEhvV/mUBsFgFVifu7P4JN5RWwkVg/4Thb FyMH0DZ5iTlvNUDCnAK2Eq8/TmGGKBGUODnzCdh8ZqCS5q2zmUHmSwj0s0vsm7yAFaLXRaKr vRbiaGGJV8e3sEPYMhL/d85ngrDLJZ4u7GOH6G1hlHjQ/pEFImEtcfj4RbA5zAKaEut36UOE HSUufJ7LCDGeT+LGW0GIE/gkJm2bzgwR5pXoaBOCqFaVeH6qB2qTtETX/3WsELaHxNFny5km MCrOQvLMLCTPzELYu4CReRWjeGppcW56arFxXmq5XnFibnFpXrpecn7uJkZgojn97/jXHYz7 /iQdYhTgYFTi4V3g8C5WiDWxrLgy9xCjBAezkgjvkomvYoV4UxIrq1KL8uOLSnNSiw8xSnOw KInzGi96GSskkJ5YkpqdmlqQWgSTZeLglGpgbL75bv6B2WJVvuua3n8u+x3w9qpp/oTXr8Pe mf498jXtMWPiVKMF8m8WfQ9PnxR7YvbUdVoxy6OD1u4x4FjL2nCJ45GBxiRmj8pZTitYVhxn 6zUx+h7+9MfMA2kmjQILXH7eWtT8ZvPTRcI3j0oGpBn5Kss1PZQ8/ko5lF8pbVaOjtP57TvZ tiixFGckGmoxFxUnAgAYxsPdMAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupmkeLIzCtJLcpLzFFi42I5/e/4Pd2bse9iDS4u0LXYOGM9q8X1L89Z LRZ8msFqcf78BnaLs01v2C0u75rDZvG59wijxdojd9ktbjeuYHPg9Ni0qpPNo2/LKkaPz5vk Apij9GyK8ktLUhUy8otLbJWiDS2M9AwtLfSMTCz1DI3NY62MTJX07WxSUnMyy1KL9O0S9DIe z1rKWrBStaLnznO2BsYW+S5GTg4JAROJo/f+MILYQgJLGSW27K2AiEtLNJ5ezQRhC0v8udbF 1sXIBVTziVGi+UADG0iCTUBf4uDZkywgtghQQ+eiiWANzAJnmCR+tYANEhZwltiw/i9YnEVA VeL+7o9gy3gFbCTWTzgONIcDaIG8xJy3GiBhTgFbidcfpzBD3GMj0f7/PwtEuaDEyZlPWCDG y0s0b53NPIFRYBaS1CwkqQWMTKsYRVJLi3PTc4uN9IoTc4tL89L1kvNzNzECI2LbsZ9bdjB2 vQs+xCjAwajEw7vA4V2sEGtiWXFl7iFGCQ5mJRHeJRNfxQrxpiRWVqUW5ccXleakFh9iNAX6 YSKzlGhyPjBa80riDU0NzS0sDc2NzY3NLJTEeTsEDsYICaQnlqRmp6YWpBbB9DFxcEo1MJYb fuNzzTYtEvVUC9lnFrhp4jTPkmPMB9uMd/3Wab7uFDFno62+0u/Ewpgd196fSFHxC4544iu1 32DjKXuj658SN1mtKK41845e/YLt7qM9VpdXJH2V2ix69+ibLy2sQh0Ts3S4JhvPefWXZ87V Bd3KnKpTHka9mf005PCXf/G3Mi8d+n/i9F4lluKMREMt5qLiRACS268ZngIAAA== X-CMS-MailID: 20191209144441eucas1p2ccd371e5861e8c0a3948cdc6640ad0d5 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20191209144441eucas1p2ccd371e5861e8c0a3948cdc6640ad0d5 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20191209144441eucas1p2ccd371e5861e8c0a3948cdc6640ad0d5 References: <20191209144425.13321-1-k.konieczny@samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Current devfreq workqueue uses deferred timer. Introduce sysfs file delayed_timer and use it for change from deferred to delayed work. The default is to use old deferred one, which saves power, but can miss increased demand for higher bus frequency if timer was assigned to idle cpu. Signed-off-by: Kamil Konieczny --- Documentation/ABI/testing/sysfs-class-devfreq | 10 ++++ drivers/devfreq/devfreq.c | 46 ++++++++++++++++++- include/linux/devfreq.h | 2 + 3 files changed, 57 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/sysfs-class-devfreq b/Documentation/ABI/testing/sysfs-class-devfreq index 9758eb85ade3..07bfd0df6a4a 100644 --- a/Documentation/ABI/testing/sysfs-class-devfreq +++ b/Documentation/ABI/testing/sysfs-class-devfreq @@ -30,6 +30,16 @@ Description: target_freq when get_cur_freq() is not implemented by devfreq driver. +What: /sys/class/devfreq/.../delayed_timer +Date: December 2019 +Contact: Kamil Konieczny +Description: + This ABI shows or clears timer type used by devfreq + workqueue. When 0, it uses default deferred timer. + When set to 1 devfreq will use delayed timer. Example + useage: + echo 1 > /sys/class/devfreq/.../delayed_timer + What: /sys/class/devfreq/.../target_freq Date: September 2012 Contact: Rajagopal Venkat diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 955949c6fc1f..c277d1770fef 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -445,7 +445,11 @@ void devfreq_monitor_start(struct devfreq *devfreq) if (devfreq->governor->interrupt_driven) return; - INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); + if (devfreq->delayed_timer) + INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor); + else + INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); + if (devfreq->profile->polling_ms) queue_delayed_work(devfreq_wq, &devfreq->work, msecs_to_jiffies(devfreq->profile->polling_ms)); @@ -698,6 +702,7 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->last_status.current_frequency = profile->initial_freq; devfreq->data = data; devfreq->nb.notifier_call = devfreq_notifier_call; + devfreq->delayed_timer = false; if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { mutex_unlock(&devfreq->lock); @@ -1288,6 +1293,44 @@ static ssize_t available_governors_show(struct device *d, } static DEVICE_ATTR_RO(available_governors); +static ssize_t delayed_timer_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int i; + + i = to_devfreq(dev)->delayed_timer ? 1 : 0; + return sprintf(buf, "%d\n", i); +} + +static ssize_t delayed_timer_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct devfreq *df = to_devfreq(dev); + bool old_timer; + int value, ret; + + if (!df->governor) + return -EINVAL; + + ret = kstrtoint(buf, 10, &value); + if (ret || (value != 1 && value != 0)) + return -EINVAL; + + mutex_lock(&df->lock); + old_timer = df->delayed_timer; + df->delayed_timer = value == 0 ? false : true; + mutex_unlock(&df->lock); + + if (old_timer != df->delayed_timer) { + devfreq_monitor_stop(df); + devfreq_monitor_start(df); + } + + return count; +} +static DEVICE_ATTR_RW(delayed_timer); + static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1513,6 +1556,7 @@ static struct attribute *devfreq_attrs[] = { &dev_attr_name.attr, &dev_attr_governor.attr, &dev_attr_available_governors.attr, + &dev_attr_delayed_timer.attr, &dev_attr_cur_freq.attr, &dev_attr_available_frequencies.attr, &dev_attr_target_freq.attr, diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index de2fdc56aa5b..761aa0a09db7 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -134,6 +134,7 @@ struct devfreq_stats { * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. + * @delayed_timer: use delayed or deferred timer for workqueue. * @previous_freq: previously configured frequency value. * @data: Private data of the governor. The devfreq framework does not * touch this. @@ -166,6 +167,7 @@ struct devfreq { char governor_name[DEVFREQ_NAME_LEN]; struct notifier_block nb; struct delayed_work work; + bool delayed_timer; unsigned long previous_freq; struct devfreq_dev_status last_status; -- 2.24.0