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Fri, 04 Oct 2019 10:05:14 -0700 (PDT) Date: Fri, 4 Oct 2019 10:05:12 -0700 From: Matthias Kaehlcke To: Leonard Crestez Subject: Re: [PATCH v9 8/8] PM / devfreq: Use PM QoS for sysfs min/max_freq Message-ID: <20191004170512.GM87296@google.com> References: <62584a1e5c08d0f9254df505883fb220ba53d57b.1570044052.git.leonard.crestez@nxp.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <62584a1e5c08d0f9254df505883fb220ba53d57b.1570044052.git.leonard.crestez@nxp.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191004_100516_002286_4405A709 X-CRM114-Status: GOOD ( 23.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Artur =?utf-8?B?xZp3aWdvxYQ=?= , Abel Vesa , Saravana Kannan , linux-pm@vger.kernel.org, Viresh Kumar , NXP Linux Team , Krzysztof Kozlowski , Lukasz Luba , Chanwoo Choi , Kyungmin Park , MyungJoo Ham , Alexandre Bailon , Georgi Djakov , linux-arm-kernel@lists.infradead.org, Jacky Bai Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Oct 02, 2019 at 10:25:11PM +0300, Leonard Crestez wrote: > Switch the handling of min_freq and max_freq from sysfs to use the > dev_pm_qos_request interface. > > Since PM QoS handles frequencies as kHz this change reduces the > precision of min_freq and max_freq. This shouldn't introduce problems > because frequencies which are not an integer number of kHz are likely > not an integer number of Hz either. > > Try to ensure compatibility by rounding min values down and rounding > max values up. > > Signed-off-by: Leonard Crestez > Reviewed-by: Matthias Kaehlcke > --- > drivers/devfreq/devfreq.c | 63 ++++++++++++++++++++++++++++----------- > include/linux/devfreq.h | 9 +++--- > 2 files changed, 51 insertions(+), 21 deletions(-) > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index 46f699b84a22..4ff5fbc4ee85 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -139,14 +139,10 @@ static void get_freq_range(struct devfreq *devfreq, > *min_freq = max(*min_freq, (unsigned long)HZ_PER_KHZ * qos_min_freq); > if (qos_max_freq != PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE) > *max_freq = min(*max_freq, > (unsigned long)HZ_PER_KHZ * qos_max_freq); > > - /* Apply constraints from sysfs */ > - *min_freq = max(*min_freq, devfreq->min_freq); > - *max_freq = min(*max_freq, devfreq->max_freq); > - > /* Apply constraints from OPP interface */ > *min_freq = max(*min_freq, devfreq->scaling_min_freq); > /* scaling_max_freq can be zero on error */ > if (devfreq->scaling_max_freq) > *max_freq = min(*max_freq, devfreq->scaling_max_freq); > @@ -690,10 +686,18 @@ static void devfreq_dev_release(struct device *dev) > err); > > if (devfreq->profile->exit) > devfreq->profile->exit(devfreq->dev.parent); > > + err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req); > + if (err) > + dev_warn(dev->parent, "Failed to remove DEV_PM_QOS_MAX_FREQUENCY request: %d\n", > + err); > + err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req); > + if (err) > + dev_warn(dev->parent, "Failed to remove DEV_PM_QOS_MIN_FREQUENCY request: %d\n", > + err); > kfree(devfreq->time_in_state); > kfree(devfreq->trans_table); > mutex_destroy(&devfreq->lock); > kfree(devfreq); > } > @@ -758,18 +762,26 @@ struct devfreq *devfreq_add_device(struct device *dev, > devfreq->scaling_min_freq = find_available_min_freq(devfreq); > if (!devfreq->scaling_min_freq) { > err = -EINVAL; > goto err_dev; > } > - devfreq->min_freq = devfreq->scaling_min_freq; > > devfreq->scaling_max_freq = find_available_max_freq(devfreq); > if (!devfreq->scaling_max_freq) { > err = -EINVAL; > goto err_dev; > } > - devfreq->max_freq = devfreq->scaling_max_freq; > + > + err = dev_pm_qos_add_request(dev, &devfreq->user_min_freq_req, > + DEV_PM_QOS_MIN_FREQUENCY, 0); > + if (err < 0) > + goto err_dev; > + err = dev_pm_qos_add_request(dev, &devfreq->user_max_freq_req, > + DEV_PM_QOS_MAX_FREQUENCY, > + PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); > + if (err < 0) > + goto err_dev; > > devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); > atomic_set(&devfreq->suspend_count, 0); > > devfreq->trans_table = kzalloc( > @@ -848,10 +860,16 @@ struct devfreq *devfreq_add_device(struct device *dev, > err_dev: > /* > * Cleanup path for errors that happen before registration. > * Otherwise we rely on devfreq_dev_release. > */ > + if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) > + if (dev_pm_qos_remove_request(&devfreq->user_max_freq_req)) > + dev_warn(dev, "Failed to remove DEV_PM_QOS_MAX_FREQUENCY request\n"); > + if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) > + if (dev_pm_qos_remove_request(&devfreq->user_min_freq_req)) > + dev_warn(dev, "Failed to remove DEV_PM_QOS_MIN_FREQUENCY request\n"); > kfree(devfreq->time_in_state); > kfree(devfreq->trans_table); > kfree(devfreq); > err_out: > return ERR_PTR(err); > @@ -1392,14 +1410,15 @@ static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, > > ret = sscanf(buf, "%lu", &value); > if (ret != 1) > return -EINVAL; > > - mutex_lock(&df->lock); > - df->min_freq = value; > - update_devfreq(df); > - mutex_unlock(&df->lock); > + /* Round down to kHz for PM QoS */ > + ret = dev_pm_qos_update_request(&df->user_min_freq_req, > + value / HZ_PER_KHZ); > + if (ret < 0) > + return ret; > > return count; > } > > static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, > @@ -1424,18 +1443,28 @@ static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, > > ret = sscanf(buf, "%lu", &value); > if (ret != 1) > return -EINVAL; > > - mutex_lock(&df->lock); > - > - if (!value) > - value = ULONG_MAX; > + /* > + * PM QoS frequencies are in kHz so we need to convert. Convert by > + * rounding upwards so that the acceptable interval never shrinks. > + * > + * For example if the user writes "666666666" to sysfs this value will > + * be converted to 666667 kHz and back to 666667000 Hz before an OPP > + * lookup, this ensures that an OPP of 666666666Hz is still accepted. > + * > + * A value of zero means "no limit". > + */ > + if (value) > + value = DIV_ROUND_UP(value, HZ_PER_KHZ); > + else > + value = PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE; > > - df->max_freq = value; > - update_devfreq(df); > - mutex_unlock(&df->lock); > + ret = dev_pm_qos_update_request(&df->user_max_freq_req, value); > + if (ret < 0) > + return ret; > > return count; > } > static DEVICE_ATTR_RW(min_freq); > > diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h > index 8b92ccbd1962..fb376b5b7281 100644 > --- a/include/linux/devfreq.h > +++ b/include/linux/devfreq.h > @@ -11,10 +11,11 @@ > #define __LINUX_DEVFREQ_H__ > > #include > #include > #include > +#include > > #define DEVFREQ_NAME_LEN 16 > > /* DEVFREQ governor name */ > #define DEVFREQ_GOV_SIMPLE_ONDEMAND "simple_ondemand" > @@ -121,12 +122,12 @@ struct devfreq_dev_profile { > * devfreq.nb to the corresponding register notifier call chain. > * @work: delayed work for load monitoring. > * @previous_freq: previously configured frequency value. > * @data: Private data of the governor. The devfreq framework does not > * touch this. > - * @min_freq: Limit minimum frequency requested by user (0: none) > - * @max_freq: Limit maximum frequency requested by user (0: none) > + * @user_min_freq_req: PM QoS minimum frequency request from user (via sysfs) > + * @user_max_freq_req: PM QoS maximum frequency request from user (via sysfs) > * @scaling_min_freq: Limit minimum frequency requested by OPP interface > * @scaling_max_freq: Limit maximum frequency requested by OPP interface > * @stop_polling: devfreq polling status of a device. > * @suspend_freq: frequency of a device set during suspend phase. > * @resume_freq: frequency of a device set in resume phase. > @@ -161,12 +162,12 @@ struct devfreq { > unsigned long previous_freq; > struct devfreq_dev_status last_status; > > void *data; /* private data for governors */ > > - unsigned long min_freq; > - unsigned long max_freq; > + struct dev_pm_qos_request user_min_freq_req; > + struct dev_pm_qos_request user_max_freq_req; > unsigned long scaling_min_freq; > unsigned long scaling_max_freq; > bool stop_polling; > > unsigned long suspend_freq; > -- > 2.17.1 > Tested-by: Matthias Kaehlcke _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel