Re: [PATCH] x86/cpu: Add Elkhart Lake to Intel family

[Peter Zijlstra <peterz@infradead.org>]

On Thu, Aug 08, 2019 at 09:20:03PM +0530, Bhardwaj, Rajneesh wrote:
> 
> On 08-Aug-19 9:01 PM, Peter Zijlstra wrote:
> > On Thu, Aug 08, 2019 at 05:23:26PM +0200, Peter Zijlstra wrote:
> > > On Thu, Aug 08, 2019 at 08:40:49PM +0530, Bhardwaj, Rajneesh wrote:
> > > > On 08-Aug-19 7:44 PM, Peter Zijlstra wrote:
> > > > > On Thu, Aug 08, 2019 at 09:19:23AM -0400, Liang, Kan wrote:
> > > > > > Usually, we should use the code name of microarchitecture for the name of
> > > > > > CPUID.
> > > > > Oh yes, very much. A quick google seems to suggest these are in fact
> > > > > Tremont cores. So then the naming should be:
> > > > > 
> > > > >     INTEL_FAM6_ATOM_TREMONT_xxx
> > > > Sure, I feel INTEL_FAM6_ATOM_TREMONT_ELKHART_LAKE may be too long so is
> > > > INTEL_FAM6_ATOM_TREMONT_PLUS a better name?
> > > Neither. WikiChip says it is the successor to Denverton, which is a
> > > server chip. If this is true then:
> > > 
> > > #define INTEL_FAM6_ATOM_TREMONT_X	0x.. /* Elkhart Lake */
> > > 
> > > is what it should be.
> > Of course we already have a TREMONT_X :-/ WikiChip is also confusing me
> > further by stating that Jacobsville is the platform that carries the
> > Elkhart Lake core, so they should be the bloody same chip.
> > 
> > But here we are, with two different model numbers.
> > 
> > Can someone please spell out in dummy language wth these chips are?
> > 
> > Are they both server chips?
> 
> 
> Elkhart Lake is Intel Atom based CPU product targeting primarily PC Client,
> IOT and industrial segments.  Jacobsville is Atom (Tremont) based
> Microserver.

Can we classify 'PC Client, IoT and Industrial' as MID ? Or rather, can
we say this Elkhart Lake is the successor to Moorefield? If not, what is
it successor to?

> Internally, preferred acronym for Elkhart Lake is EHL so does
> INTEL_FAM6_ATOM_TREMONT_EHL look ok?

No; that would be wildly inconsistent with everything else.

Also, I would suggest correcting wikichip and creating a tremont
(microarchitecture) wikipedia page.  There is a distinct lack of public
information on this.