linux-kernel - Re: [PATCH V4 6/8] perf/x86/intel/uncore: SKX support for IIO free running counters

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Message-ID: <alpine.DEB.2.20.1801142154220.2371@nanos>
Date:   Sun, 14 Jan 2018 21:54:47 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Kan Liang <kan.liang@...el.com>
cc:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, acme@...nel.org, eranian@...gle.com,
        ak@...ux.intel.com
Subject: Re: [PATCH V4 6/8] perf/x86/intel/uncore: SKX support for IIO free
 running counters

On Thu, 2 Nov 2017, kan.liang@...el.com wrote:

> From: Kan Liang <Kan.liang@...el.com>
> 
> As of Skylake Server, there are a number of free-running counters in
> each IIO Box that collect counts for per box IO clocks and per Port
> Input/Output x BW/Utilization.
> 
> The free running counter is read-only and always active. Counting will
> be suspended only when the IIO Box is powered down.
> 
> There are three types of IIO free running counters on Skylake server, IO
> CLOCKS counter, BANDWIDTH counters and UTILIZATION counters.
> IO CLOCKS counter is to count IO clocks.
> BANDWIDTH counters are to count inbound(PCIe->CPU)/outbound(CPU->PCIe)
> bandwidth.
> UTILIZATION counters are to count input/output utilization.
> 
> The bit width of the free running counters is 36-bits.
> 
> Signed-off-by: Kan Liang <Kan.liang@...el.com>

Assumed that all the magic numbers are correct:

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>