linux-kernel - Re: [PATCH 1/4] drivers core: Introduce CPU type sysfs interface

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Message-ID: <20201006010835.GF6041@ranerica-svr.sc.intel.com>
Date:   Mon, 5 Oct 2020 18:08:35 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     x86@...nel.org, Borislav Petkov <bp@...e.de>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Len Brown <len.brown@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH 1/4] drivers core: Introduce CPU type sysfs interface

On Sat, Oct 03, 2020 at 01:05:48PM +0200, Greg Kroah-Hartman wrote:
> On Sat, Oct 03, 2020 at 10:53:45AM +0200, Greg Kroah-Hartman wrote:
> > On Fri, Oct 02, 2020 at 06:17:42PM -0700, Ricardo Neri wrote:
> > > +/**
> > > + * arch_get_cpu_type_name() - Get the CPU type name
> > > + * @cpu_type:	Type of CPU micro-architecture.
> > > + *
> > > + * Returns a string name associated with the CPU micro-architecture type as
> > > + * indicated in @cpu_type. The format shall be <vendor>_<cpu_type>. Returns
> > > + * NULL if the CPU type is not known.
> > > + */
> > > +const char __weak *arch_get_cpu_type_name(u32 cpu_type)
> > > +{
> > > +	return NULL;
> > > +}
> > 
> > Why is vendor part of this?  Shouldn't it just be arch?
> > 
> > I say this as "vendor" is kind of "interesting" when it comes to other
> > arches...
> > 
> > Speaking of other arches, we all know that other arches have this
> > feature as well, have you worked with any other groups to verify that
> > this interface will also work with them?
> 
> Here's one set of patches for ARM64 for much the same type of cpu
> design:
> 	https://android-review.googlesource.com/c/kernel/common/+/1437098/3
> Yes, it's not been posted to any kernel lists, but this is public so you
> need to work with the ARM developers to come up with an interface that
> works for everyone please.

Thanks for the pointer, Greg! I will study this proposal and work with
the ARM engineers.

BR,
Ricardo