From: Eric Anholt <eric@anholt.net>
To: Vince Weaver <vincent.weaver@maine.edu>,
Stefan Wahren <stefan.wahren@i2se.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
bcm-kernel-feedback-list@broadcom.com,
linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm: bcm2835: Add the PMU to the devicetree.
Date: Thu, 17 May 2018 18:09:34 +0100 [thread overview]
Message-ID: <877eo2mcoh.fsf@anholt.net> (raw)
In-Reply-To: <alpine.DEB.2.21.1805171233500.7984@macbook-air>
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Vince Weaver <vincent.weaver@maine.edu> writes:
> On Thu, 17 May 2018, Stefan Wahren wrote:
>
>>
>> > Eric Anholt <eric@anholt.net> hat am 17. Mai 2018 um 15:17 geschrieben:
>> >
>> >
>> > The a53 and a7 counters seem to match up, so we advertise a7 so that
>> > arm32 can probe.
>
> so how closely did you look at the a53/a7 differences? I see some major
> differences, especially with the CPU_CYCLES event (0xff vs 0x11).
I'm a bit lost in the code, but it seemed like the 0xff was a
placeholder for a bit of special behavior, but that the cpu_cycles ->
ARMV7_PERFCTR_CLOCK_CYCLES mapping got you that same value in the end.
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next prev parent reply other threads:[~2018-05-17 17:09 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-17 13:17 [PATCH] arm: bcm2835: Add the PMU to the devicetree Eric Anholt
2018-05-17 14:11 ` Vince Weaver
2018-05-17 14:30 ` Eric Anholt
2018-05-17 16:02 ` Vince Weaver
2018-05-17 16:06 ` Stefan Wahren
2018-05-17 15:59 ` Stefan Wahren
2018-05-17 16:34 ` Vince Weaver
2018-05-17 16:55 ` Stefan Wahren
2018-05-17 18:07 ` Peter Zijlstra
2018-05-17 18:27 ` Vince Weaver
2018-05-17 19:31 ` Vince Weaver
2018-05-17 19:59 ` Florian Fainelli
2018-05-18 8:07 ` Marc Zyngier
2018-05-18 9:37 ` Stefan Wahren
2018-05-18 9:49 ` Marc Zyngier
2018-05-17 17:09 ` Eric Anholt [this message]
2018-05-17 16:44 ` Peter Robinson
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