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From: Lukasz Luba <lukasz.luba@arm.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	dri-devel@lists.freedesktop.org, linux-omap@vger.kernel.org,
	linux-mediatek@lists.infradead.org,
	linux-arm-msm@vger.kernel.org, linux-imx@nxp.com,
	Dietmar.Eggemann@arm.com, cw00.choi@samsung.com,
	b.zolnierkie@samsung.com, rjw@rjwysocki.net,
	sudeep.holla@arm.com, viresh.kumar@linaro.org, nm@ti.com,
	sboyd@kernel.org, rui.zhang@intel.com,
	amit.kucheria@verdurent.com, mingo@redhat.com,
	peterz@infradead.org, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, rostedt@goodmis.org,
	qperret@google.com, bsegall@google.com, mgorman@suse.de,
	shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com,
	kernel@pengutronix.de, khilman@kernel.org, agross@kernel.org,
	bjorn.andersson@linaro.org, robh@kernel.org,
	matthias.bgg@gmail.com, steven.price@arm.com,
	tomeu.vizoso@collabora.com, alyssa.rosenzweig@collabora.com,
	airlied@linux.ie, daniel@ffwll.ch, liviu.dudau@arm.com,
	lorenzo.pieralisi@arm.com, patrick.bellasi@matbug.net,
	orjan.eide@arm.com, rdunlap@infradead.org, mka@chromium.org
Subject: Re: [PATCH v6 04/10] PM / EM: add support for other devices than CPUs in Energy Model
Date: Thu, 23 Apr 2020 17:57:45 +0100	[thread overview]
Message-ID: <ff1c8cc5-f64d-6156-7d30-97b8426c6f99@arm.com> (raw)
In-Reply-To: <20200423151250.GB65632@linaro.org>



On 4/23/20 4:12 PM, Daniel Lezcano wrote:
> On Fri, Apr 10, 2020 at 09:42:04AM +0100, Lukasz Luba wrote:
>> Add support for other devices that CPUs. The registration function
>> does not require a valid cpumask pointer and is ready to handle new
>> devices. Some of the internal structures has been reorganized in order to
>> keep consistent view (like removing per_cpu pd pointers). To track usage
>> of the Energy Model structures, they are protected with kref.
> 
> Why not add the energy model structure in the struct device directly?

Do you mean this structure?
https://elixir.bootlin.com/linux/latest/source/include/linux/device.h#L537

and to put something like:
struct device {
...
	struct dev_pm_domain	*pm_domain;
#ifdef CONFIG_ENERGY_MODEL
	struct em_perf_domain	*em_pd;
#endif
...
};

> 
> For instance for the em_cpu_get() function, the cpu id allows to retrieve the
> cpu device and then from there, the energy model instead of browsing another
> list. The em_device life cycle will be tied to the struct device.

That would be perfect.

> 
> Then when the struct device and the em_device are connected, add the debugfs
> with a struct device list for those which are energy aware, so you end up with
> a structure:
> 
> struct em_device {
> 	struct device *dev;
> 	struct list_head em_dev_list;
> };
> 
> (a global single dentry for debugfs to do a recursive delete is enough).
> 
> Locks when inspecting and add/removal called from the struct device release
> function. So no need of an extra refcounting.
> 
> Does it make sense?
> 

Indeed it looks much cleaner/simpler.

I will try to address this idea and get rid of refcounting.

This should be doable in this patch (4/10). In the v7 I will keep your
ACKs for other patches that you have already commented.

Thank you for your suggestions and review.

Regards,
Lukasz


WARNING: multiple messages have this Message-ID (diff)
From: Lukasz Luba <lukasz.luba@arm.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
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,
	vincent.guittot@linaro.org, khilman@kernel.org,
	agross@kernel.org, b.zolnierkie@samsung.com,
	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, 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: Thu, 23 Apr 2020 17:57:45 +0100	[thread overview]
Message-ID: <ff1c8cc5-f64d-6156-7d30-97b8426c6f99@arm.com> (raw)
In-Reply-To: <20200423151250.GB65632@linaro.org>



On 4/23/20 4:12 PM, Daniel Lezcano wrote:
> On Fri, Apr 10, 2020 at 09:42:04AM +0100, Lukasz Luba wrote:
>> Add support for other devices that CPUs. The registration function
>> does not require a valid cpumask pointer and is ready to handle new
>> devices. Some of the internal structures has been reorganized in order to
>> keep consistent view (like removing per_cpu pd pointers). To track usage
>> of the Energy Model structures, they are protected with kref.
> 
> Why not add the energy model structure in the struct device directly?

Do you mean this structure?
https://elixir.bootlin.com/linux/latest/source/include/linux/device.h#L537

and to put something like:
struct device {
...
	struct dev_pm_domain	*pm_domain;
#ifdef CONFIG_ENERGY_MODEL
	struct em_perf_domain	*em_pd;
#endif
...
};

> 
> For instance for the em_cpu_get() function, the cpu id allows to retrieve the
> cpu device and then from there, the energy model instead of browsing another
> list. The em_device life cycle will be tied to the struct device.

That would be perfect.

> 
> Then when the struct device and the em_device are connected, add the debugfs
> with a struct device list for those which are energy aware, so you end up with
> a structure:
> 
> struct em_device {
> 	struct device *dev;
> 	struct list_head em_dev_list;
> };
> 
> (a global single dentry for debugfs to do a recursive delete is enough).
> 
> Locks when inspecting and add/removal called from the struct device release
> function. So no need of an extra refcounting.
> 
> Does it make sense?
> 

Indeed it looks much cleaner/simpler.

I will try to address this idea and get rid of refcounting.

This should be doable in this patch (4/10). In the v7 I will keep your
ACKs for other patches that you have already commented.

Thank you for your suggestions and review.

Regards,
Lukasz


_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

WARNING: multiple messages have this Message-ID (diff)
From: Lukasz Luba <lukasz.luba@arm.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
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, b.zolnierkie@samsung.com,
	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, 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: Thu, 23 Apr 2020 17:57:45 +0100	[thread overview]
Message-ID: <ff1c8cc5-f64d-6156-7d30-97b8426c6f99@arm.com> (raw)
In-Reply-To: <20200423151250.GB65632@linaro.org>



On 4/23/20 4:12 PM, Daniel Lezcano wrote:
> On Fri, Apr 10, 2020 at 09:42:04AM +0100, Lukasz Luba wrote:
>> Add support for other devices that CPUs. The registration function
>> does not require a valid cpumask pointer and is ready to handle new
>> devices. Some of the internal structures has been reorganized in order to
>> keep consistent view (like removing per_cpu pd pointers). To track usage
>> of the Energy Model structures, they are protected with kref.
> 
> Why not add the energy model structure in the struct device directly?

Do you mean this structure?
https://elixir.bootlin.com/linux/latest/source/include/linux/device.h#L537

and to put something like:
struct device {
...
	struct dev_pm_domain	*pm_domain;
#ifdef CONFIG_ENERGY_MODEL
	struct em_perf_domain	*em_pd;
#endif
...
};

> 
> For instance for the em_cpu_get() function, the cpu id allows to retrieve the
> cpu device and then from there, the energy model instead of browsing another
> list. The em_device life cycle will be tied to the struct device.

That would be perfect.

> 
> Then when the struct device and the em_device are connected, add the debugfs
> with a struct device list for those which are energy aware, so you end up with
> a structure:
> 
> struct em_device {
> 	struct device *dev;
> 	struct list_head em_dev_list;
> };
> 
> (a global single dentry for debugfs to do a recursive delete is enough).
> 
> Locks when inspecting and add/removal called from the struct device release
> function. So no need of an extra refcounting.
> 
> Does it make sense?
> 

Indeed it looks much cleaner/simpler.

I will try to address this idea and get rid of refcounting.

This should be doable in this patch (4/10). In the v7 I will keep your
ACKs for other patches that you have already commented.

Thank you for your suggestions and review.

Regards,
Lukasz


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Lukasz Luba <lukasz.luba@arm.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
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,
	mka@chromium.org, amit.kucheria@verdurent.com,
	lorenzo.pieralisi@arm.com, vincent.guittot@linaro.org,
	khilman@kernel.org, agross@kernel.org, b.zolnierkie@samsung.com,
	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, 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, 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: Thu, 23 Apr 2020 17:57:45 +0100	[thread overview]
Message-ID: <ff1c8cc5-f64d-6156-7d30-97b8426c6f99@arm.com> (raw)
In-Reply-To: <20200423151250.GB65632@linaro.org>



On 4/23/20 4:12 PM, Daniel Lezcano wrote:
> On Fri, Apr 10, 2020 at 09:42:04AM +0100, Lukasz Luba wrote:
>> Add support for other devices that CPUs. The registration function
>> does not require a valid cpumask pointer and is ready to handle new
>> devices. Some of the internal structures has been reorganized in order to
>> keep consistent view (like removing per_cpu pd pointers). To track usage
>> of the Energy Model structures, they are protected with kref.
> 
> Why not add the energy model structure in the struct device directly?

Do you mean this structure?
https://elixir.bootlin.com/linux/latest/source/include/linux/device.h#L537

and to put something like:
struct device {
...
	struct dev_pm_domain	*pm_domain;
#ifdef CONFIG_ENERGY_MODEL
	struct em_perf_domain	*em_pd;
#endif
...
};

> 
> For instance for the em_cpu_get() function, the cpu id allows to retrieve the
> cpu device and then from there, the energy model instead of browsing another
> list. The em_device life cycle will be tied to the struct device.

That would be perfect.

> 
> Then when the struct device and the em_device are connected, add the debugfs
> with a struct device list for those which are energy aware, so you end up with
> a structure:
> 
> struct em_device {
> 	struct device *dev;
> 	struct list_head em_dev_list;
> };
> 
> (a global single dentry for debugfs to do a recursive delete is enough).
> 
> Locks when inspecting and add/removal called from the struct device release
> function. So no need of an extra refcounting.
> 
> Does it make sense?
> 

Indeed it looks much cleaner/simpler.

I will try to address this idea and get rid of refcounting.

This should be doable in this patch (4/10). In the v7 I will keep your
ACKs for other patches that you have already commented.

Thank you for your suggestions and review.

Regards,
Lukasz

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2020-04-23 16:58 UTC|newest]

Thread overview: 116+ 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 ` Lukasz Luba
2020-04-10  8:42 ` Lukasz Luba
2020-04-10  8:42 ` Lukasz Luba
2020-04-10  8:42 ` [PATCH v6 01/10] PM / EM: change naming convention from 'capacity' to 'performance' Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-23  9:55   ` Daniel Lezcano
2020-04-23  9:55     ` Daniel Lezcano
2020-04-23  9:55     ` Daniel Lezcano
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
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-23 10:46   ` Daniel Lezcano
2020-04-23 10:46     ` Daniel Lezcano
2020-04-23 10:46     ` Daniel Lezcano
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
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-23 13:22   ` Daniel Lezcano
2020-04-23 13:22     ` Daniel Lezcano
2020-04-23 13:22     ` Daniel Lezcano
2020-04-23 13:22     ` Daniel Lezcano
2020-04-23 15:28     ` Lukasz Luba
2020-04-23 15:28       ` Lukasz Luba
2020-04-23 15:28       ` Lukasz Luba
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  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10 11:12   ` Luis Gerhorst
2020-04-10 11:12     ` Luis Gerhorst
2020-04-10 11:12     ` Luis Gerhorst
2020-04-10 11:12     ` Luis Gerhorst
2020-04-10 11:34     ` Lukasz Luba
2020-04-10 11:34       ` Lukasz Luba
2020-04-10 11:34       ` Lukasz Luba
2020-04-10 11:34       ` Lukasz Luba
2020-04-10 14:35   ` kbuild test robot
2020-04-10 14:35     ` kbuild test robot
2020-04-10 14:35     ` kbuild test robot
2020-04-10 14:35     ` kbuild test robot
2020-04-23 15:12   ` Daniel Lezcano
2020-04-23 15:12     ` Daniel Lezcano
2020-04-23 15:12     ` Daniel Lezcano
2020-04-23 15:12     ` Daniel Lezcano
2020-04-23 16:57     ` Lukasz Luba [this message]
2020-04-23 16:57       ` Lukasz Luba
2020-04-23 16:57       ` Lukasz Luba
2020-04-23 16:57       ` Lukasz Luba
2020-04-23 17:15       ` Daniel Lezcano
2020-04-23 17:15         ` Daniel Lezcano
2020-04-23 17:15         ` Daniel Lezcano
2020-04-23 17:15         ` Daniel Lezcano
2020-04-23 17:19         ` Lukasz Luba
2020-04-23 17:19           ` Lukasz Luba
2020-04-23 17:19           ` Lukasz Luba
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
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-23 15:14   ` Daniel Lezcano
2020-04-23 15:14     ` Daniel Lezcano
2020-04-23 15:14     ` Daniel Lezcano
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
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-23 15:28   ` Daniel Lezcano
2020-04-23 15:28     ` Daniel Lezcano
2020-04-23 15:28     ` Daniel Lezcano
2020-04-23 15:28     ` Daniel Lezcano
2020-04-10  8:42 ` [PATCH v6 07/10] Documentation: power: update Energy Model description Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-23 16:07   ` Daniel Lezcano
2020-04-23 16:07     ` Daniel Lezcano
2020-04-23 16:07     ` Daniel Lezcano
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
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-23 16:47   ` Daniel Lezcano
2020-04-23 16:47     ` Daniel Lezcano
2020-04-23 16:47     ` Daniel Lezcano
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
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-23 17:57   ` Daniel Lezcano
2020-04-23 17:57     ` Daniel Lezcano
2020-04-23 17:57     ` Daniel Lezcano
2020-04-23 17:57     ` Daniel Lezcano
2020-04-24 10:02     ` Lukasz Luba
2020-04-24 10:02       ` Lukasz Luba
2020-04-24 10:02       ` Lukasz Luba
2020-04-24 10:02       ` Lukasz Luba
2020-04-24 10:43       ` Daniel Lezcano
2020-04-24 10:43         ` Daniel Lezcano
2020-04-24 10:43         ` Daniel Lezcano
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
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba
2020-04-10  8:42   ` Lukasz Luba

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