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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200117172726.GM302770@tassilo.jf.intel.com>
Date:   Fri, 17 Jan 2020 09:27:26 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     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

> > Could you suggest how such a 1:N mapping should be expressed instead in
> > sysfs?
> 
> I have yet to figure out what it is you all are trying to express here
> given a lack of Documentation/ABI/ file :)

I thought the example Roman gave was clear.

System has multiple dies
Each die has 4 pmon ports
Each pmon port per die maps to one PCI bus.

He mapped it to 

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.

-Andi