linux-kernel - Re: [PATCH V2 1/4] firmware: arm_scmi: Add perf_notify

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Message-ID: <ZbowcUEa3-gxqzXp@pluto>
Date: Wed, 31 Jan 2024 11:35:27 +0000
From: Cristian Marussi <cristian.marussi@....com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: Sibi Sankar <quic_sibis@...cinc.com>, rafael@...nel.org,
	viresh.kumar@...aro.org, morten.rasmussen@....com,
	dietmar.eggemann@....com, lukasz.luba@....com,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, quic_mdtipton@...cinc.com,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH V2 1/4] firmware: arm_scmi: Add perf_notify_support
 interface

On Wed, Jan 31, 2024 at 11:28:54AM +0000, Sudeep Holla wrote:
> On Mon, Jan 29, 2024 at 05:33:42PM +0000, Cristian Marussi wrote:
> > On Mon, Jan 29, 2024 at 03:50:20PM +0000, Cristian Marussi wrote:
> > > On Wed, Jan 17, 2024 at 04:11:13PM +0530, Sibi Sankar wrote:
> > > > Add a new perf_notify_support interface to the existing perf_ops to export
> > > > info regarding limit/level change notification support.
> > > > 
> > > 
> > > Hi Sibi,
> > > 
> > > as I mentioned previously, in order not to add a needless stream of SCMI
> > > Perf accessors I posted this:
> > > 
> > > https://lore.kernel.org/linux-arm-kernel/20240129151002.1215333-1-cristian.marussi@arm.com/T/#u
> > > 
> > > to expose all the Perf domains infos via the usual info_get(), similarly
> > > to how other SCMI protocols do already.
> > > 
> > > I think that reworking this series on that, you can certainly drop this patch and just
> > > check the _notify booleans on the retrieved domain info.
> > 
> > Sorry, but hold on with this change, I will probably post an updated version
> > my patch above.
> > 
> 
> As discussed in private, I would prefer to avoid exposing all the internals
> to the users of SCMI perf. At the same time may we can do better if we can
> check the availability of notification as part of notification enablement
> from the SCMI driver, I need to think the details yet.

Yes a patch is under-work to avoid exposing too much Perf info AND to
avoid adding ad-hoc accessors like xlate, in this case.

Thanks,
Cristian