linux-kernel - Re: [PATCH v4 2/2] perf x86: Exposing an Uncore unit to PMON for Intel Xeon® server platform

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Message-ID: <20200117191220.GN302770@tassilo.jf.intel.com>
Date:   Fri, 17 Jan 2020 11:12:20 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     roman.sudarikov@...ux.intel.com
Cc:     gregkh@...ux-foundation.org, roman.sudarikov@...ux.intel.com,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, eranian@...gle.com,
        bgregg@...flix.com, kan.liang@...ux.intel.com,
        alexander.antonov@...el.com
Subject: Re: [PATCH v4 2/2] perf x86: Exposing an Uncore unit to PMON for Intel Xeon® server platform

> > pmon0-3: list of pci busses indexed by die
> > 
> > To be honest the approach doesn't seem unreasonable to me. It's similar
> > e.g. how we express lists of cpus or nodes in sysfs today.

<snipped repeated form letter non answer to question>

Roman, 

I suppose you'll need something like

/sys/device/system/dieXXX/pci-pmon<0-3>/bus 

and bus could be a symlink to the pci bus directory.

The whole thing will be ugly and complicated and slow and difficult
to parse, but it will presumably follow Greg's rules.

-Andi