From: Luis Gerhorst <linux-kernel@luisgerhorst•de>
To: Lukasz Luba <lukasz.luba@arm•com>
Cc: nm@ti•com, juri.lelli@redhat•com, peterz@infradead•org,
viresh.kumar@linaro•org, liviu.dudau@arm•com,
dri-devel@lists•freedesktop.org, bjorn.andersson@linaro•org,
bsegall@google•com, alyssa.rosenzweig@collabora•com,
festevam@gmail•com, mka@chromium•org, robh@kernel•org,
amit.kucheria@verdurent•com, lorenzo.pieralisi@arm•com,
khilman@kernel•org, agross@kernel•org, daniel.lezcano@linaro•org,
steven.price@arm•com, cw00.choi@samsung•com, mingo@redhat•com,
linux-imx@nxp•com, rui.zhang@intel•com, mgorman@suse•de,
orjan.eide@arm•com, daniel@ffwll•ch, linux-pm@vger•kernel.org,
linux-arm-msm@vger•kernel.org, s.hauer@pengutronix•de,
rostedt@goodmis•org, linux-mediatek@lists•infradead.org,
matthias.bgg@gmail•com, linux-omap@vger•kernel.org,
Dietmar.Eggemann@arm•com, linux-arm-kernel@lists•infradead.org,
airlied@linux•ie, tomeu.vizoso@collabora•com, qperret@google•com,
sboyd@kernel•org, rdunlap@infradead•org, rjw@rjwysocki•net,
linux-kernel@vger•kernel.org, b.zolnierkie@samsung•com,
kernel@pengutronix•de, sudeep.holla@arm•com,
patrick.bellasi@matbug•net, shawnguo@kernel•org
Subject: Re: [PATCH v6 04/10] PM / EM: add support for other devices than CPUs in Energy Model
Date: Fri, 10 Apr 2020 13:12:28 +0200 [thread overview]
Message-ID: <87ftdboaqr.fsf@luis-debian.luis-debian-domain> (raw)
In-Reply-To: <20200410084210.24932-5-lukasz.luba@arm.com>
Lukasz Luba writes:
> +/**
> + * em_dev_unregister_perf_domain() - Unregister Energy Model
> (EM) for a device
> + * @dev : Device for which the EM is registered
> + *
> + * Try to unregister the EM for the specified device (it checks
> current
> + * reference counter). The EM for CPUs will not be freed.
> + */
> +void em_dev_unregister_perf_domain(struct device *dev)
> +{
> + struct em_device *em_dev, *tmp;
> +
> + if (IS_ERR_OR_NULL(dev))
> + return;
> +
> + /* We don't support freeing CPU structures in hotplug */
> + if (_is_cpu_device(dev)) {
> + dev_dbg_once(dev, "EM: the structures are not going to be
> removed\n");
> + return;
> + }
> +
> + mutex_lock(&em_pd_mutex);
> +
> + if (list_empty(&em_pd_dev_list)) {
> + mutex_unlock(&em_pd_mutex);
> + return;
> + }
> +
> + list_for_each_entry_safe(em_dev, tmp, &em_pd_dev_list,
> em_dev_list) {
> + if (em_dev->dev == dev) {
> + kref_put(&em_dev->kref, _em_release);
> + break;
> + }
> + }
> +
> + mutex_unlock(&em_pd_mutex);
> +}
> +EXPORT_SYMBOL_GPL(em_dev_unregister_perf_domain);
Ok, so em_dev_unregister_perf_domain() does not support the CPU
device
and a subsequent em_register_perf_domain() will fail with EEXIST.
Is there a way to unregister/change the CPU's energy model during
runtime without restarting the whole system?
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next prev parent reply other threads:[~2020-04-10 11:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-10 8:42 [PATCH v6 00/10] Add support for devices in the Energy Model Lukasz Luba
2020-04-10 8:42 ` [PATCH v6 01/10] PM / EM: change naming convention from 'capacity' to 'performance' Lukasz Luba
2020-04-23 9:55 ` Daniel Lezcano
2020-04-10 8:42 ` [PATCH v6 02/10] PM / EM: introduce em_dev_register_perf_domain function Lukasz Luba
2020-04-23 10:46 ` Daniel Lezcano
2020-04-10 8:42 ` [PATCH v6 03/10] PM / EM: update callback structure and add device pointer Lukasz Luba
2020-04-23 13:22 ` Daniel Lezcano
2020-04-23 15:28 ` Lukasz Luba
2020-04-10 8:42 ` [PATCH v6 04/10] PM / EM: add support for other devices than CPUs in Energy Model Lukasz Luba
2020-04-10 11:12 ` Luis Gerhorst [this message]
2020-04-10 11:34 ` Lukasz Luba
2020-04-23 15:12 ` Daniel Lezcano
2020-04-23 16:57 ` Lukasz Luba
2020-04-23 17:15 ` Daniel Lezcano
2020-04-23 17:19 ` Lukasz Luba
2020-04-10 8:42 ` [PATCH v6 05/10] PM / EM: remove em_register_perf_domain Lukasz Luba
2020-04-23 15:14 ` Daniel Lezcano
2020-04-10 8:42 ` [PATCH v6 06/10] PM / EM: change name of em_pd_energy to em_cpu_energy Lukasz Luba
2020-04-23 15:28 ` Daniel Lezcano
2020-04-10 8:42 ` [PATCH v6 07/10] Documentation: power: update Energy Model description Lukasz Luba
2020-04-23 16:07 ` Daniel Lezcano
2020-04-10 8:42 ` [PATCH v6 08/10] OPP: refactor dev_pm_opp_of_register_em() and update related drivers Lukasz Luba
2020-04-23 16:47 ` Daniel Lezcano
2020-04-10 8:42 ` [PATCH v6 09/10] thermal: devfreq_cooling: Refactor code and switch to use Energy Model Lukasz Luba
2020-04-23 17:57 ` Daniel Lezcano
2020-04-24 10:02 ` Lukasz Luba
2020-04-24 10:43 ` Daniel Lezcano
2020-04-10 8:42 ` [PATCH v6 10/10] drm/panfrost: Register devfreq cooling and attempt to add " Lukasz Luba
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