linux-kernel - Re: [PATCH v2 02/33] Documentation, ABI: Add a document entry for cache id

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Message-ID: <alpine.DEB.2.20.1609082131540.5454@nanos>
Date:   Thu, 8 Sep 2016 21:33:37 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Fenghua Yu <fenghua.yu@...el.com>
cc:     "H. Peter Anvin" <h.peter.anvin@...el.com>,
        Ingo Molnar <mingo@...e.hu>, Tony Luck <tony.luck@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tejun Heo <tj@...nel.org>, Borislav Petkov <bp@...e.de>,
        Stephane Eranian <eranian@...gle.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        Shaohua Li <shli@...com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        Sai Prakhya <sai.praneeth.prakhya@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v2 02/33] Documentation, ABI: Add a document entry for
 cache id

On Thu, 8 Sep 2016, Fenghua Yu wrote:
> +What:		/sys/devices/system/cpu/cpu*/cache/index*/id
> +Date:		July 2016
> +Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
> +Description:	Cache id
> +
> +		The id identifies a hardware cache of the system within a given
> +		cache index in a set of cache indices. The "index" name is
> +		simply a nomenclature from CPUID's leaf 4 which enumerates all
> +		caches on the system by referring to each one as a cache index.
> +		The (cache index, cache id) pair is unique for the whole
> +		system.
> +
> +		Currently id is implemented on x86. On other platforms, id is
> +		not enabled yet.

And it never will be available on anything else than x86 because there is
no other architecture providing CPUID leaf 4 ....

If you want this to be generic then get rid of the x86isms in the
explanation and describe the x86 specific part seperately.

Thanks,

	tglx