linux-kernel - Re: [PATCH v4] ARM: perf: save/restore pmu registers in pm notifier

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Message-ID: <CAMuHMdVTfPW2Hb_d6QLg8aQdaV55TODwjEivfbs+4dvXEZJcDw@mail.gmail.com>
Date:	Mon, 20 Oct 2014 11:41:22 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Sudeep Holla <Sudeep.Holla@....com>,
	Neil Zhang <zhangwm@...vell.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH v4] ARM: perf: save/restore pmu registers in pm notifier

On Mon, Oct 20, 2014 at 11:20 AM, Will Deacon <will.deacon@....com> wrote:
> On Mon, Oct 20, 2014 at 10:16:16AM +0100, Sudeep Holla wrote:
>> On 20/10/14 09:46, Neil Zhang wrote:
>> > Will, I prefer to check always-on field under PMU node to check
>> > whether we need Save/restore them.
>> >
>> But how do you handle it for different idle states. e.g. if CPU is in
>> retention, PMU's *might be* retained. Also I don't think PMUs will be
>> placed in "always-on" power domain like timers. So using "always-on"
>> sounds incorrect to me.
>
> Adding Mathieu to CC, since I spoke to him at LPC about this and he was
> talking about implementing proper PM domain descriptions for coresight
> components.

Good to hear that!

Gr{oetje,eeting}s,

                        Geert (who skipped LPC)

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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