linux-kernel - Re: [PATCH 04/14] x86 topology: Add CPUID.1F multi-die/package support

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Message-ID: <cacc41fd-240b-0589-ddd0-5e2dbf6df30d@intel.com>
Date:   Tue, 26 Feb 2019 11:46:24 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Len Brown <lenb@...nel.org>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH 04/14] x86 topology: Add CPUID.1F multi-die/package
 support

On 2/25/19 10:20 PM, Len Brown wrote:
> -/* leaf 0xb sub-leaf types */
> +/* extended topology sub-leaf types */
>  #define INVALID_TYPE	0
>  #define SMT_TYPE	1
>  #define CORE_TYPE	2
> +#define DIE_TYPE	5

Looking in the SDM, Vol. 3A "8.9.1 Hierarchical Mapping of Shared
Resources", there are a _couple_ of new levels: Die, Tile and Module.
But, this patch only covers Dies.

Was there a reason for that?

I wonder if we'll end up with different (better) infrastructure if we do
these all at once instead of hacking them in one at a time.