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From: Borislav Petkov <bp@alien8.de>
To: "Winiarska, Iwona" <iwona.winiarska@intel.com>
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Subject: Re: [PATCH v2 01/15] x86/cpu: Move intel-family to arch-independent headers
Date: Mon, 11 Oct 2021 23:31:45 +0200	[thread overview]
Message-ID: <YWStQSrRJQ09KXVY@zn.tnic> (raw)
In-Reply-To: <337b6332312ea63862aedd09279417c9e1c7e11f.camel@intel.com>

On Mon, Oct 11, 2021 at 08:38:43PM +0000, Winiarska, Iwona wrote:
> Everything that's part of this series runs on the BMC (Baseboard
> Management Controller). There's nothing ARM specific to it - it's just
> that the BMC hardware we're currently supporting is ARM-based. PECI is
> an interface that's exposed by some x86 CPUs - but that's a hardware
> interface (available completely independent from whatever is actually
> running on the x86 CPU).

Aha, I think I got it: so this whole PECI pile is supposed to run on
the BMC - which can be ARM but doesn't have to be, i.e., code should be
generic enough - and the interfaces to the x86 CPU do get exposed to the
Linux running on the BMC.

Which brings me to the answer to your other mail:

On Mon, Oct 11, 2021 at 07:32:38PM +0000, Winiarska, Iwona wrote:
> Nothing wrong - just a trade-off between churn and keeping things tidy
> and not duplicated, similar to patch 1. And just like in patch 1, if
> you have a strong opinion against it - we can duplicate.

So it is not about strong opinion. Rather, it is about whether this
exporting would be disadvantageous for x86 freedom. And I think it will
be:

Because if you exported those and then we went and changed those
interfaces and defines (changed their naming, function arguments,
whatever) and something outside of x86 used them, we will break that
something.

And usually we go and fix those users too but I doubt anyone has access
to that PECI hw to actually test fixes, etc, etc.

So I'd prefer the small amount of duplication vs external stuff using
x86 facilities any day of the week. And so I'd suggest you simply copy
the handful of functions and defines you're gonna be needing and the
defines and be done with it.

Dave's idea makes sense to me too but lately it keeps happening that
we change something in x86-land and it turns out something "from the
outside" is using it and it breaks, so it is a lot easier if things are
independent.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply	other threads:[~2021-10-11 21:51 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-03 11:31 [PATCH v2 00/15] Introduce PECI subsystem Iwona Winiarska
2021-08-03 11:31 ` [PATCH v2 01/15] x86/cpu: Move intel-family to arch-independent headers Iwona Winiarska
2021-10-04 19:03   ` Borislav Petkov
2021-10-11 19:21     ` Winiarska, Iwona
2021-10-11 19:40       ` Dave Hansen
2021-10-11 20:53         ` Winiarska, Iwona
2021-10-11 23:12           ` Dave Hansen
2021-10-11 20:06       ` Borislav Petkov
2021-10-11 20:38         ` Winiarska, Iwona
2021-10-11 21:31           ` Borislav Petkov [this message]
2021-10-12 23:15             ` Winiarska, Iwona
2021-10-13  6:42               ` Borislav Petkov
2021-08-03 11:31 ` [PATCH v2 02/15] x86/cpu: Extract cpuid helpers to arch-independent Iwona Winiarska
2021-10-04 19:08   ` Borislav Petkov
2021-10-11 19:32     ` Winiarska, Iwona
2021-08-03 11:31 ` [PATCH v2 03/15] dt-bindings: Add generic bindings for PECI Iwona Winiarska
2021-08-11 18:11   ` Rob Herring
2021-08-03 11:31 ` [PATCH v2 04/15] dt-bindings: Add bindings for peci-aspeed Iwona Winiarska
2021-08-11 18:11   ` Rob Herring
2021-08-03 11:31 ` [PATCH v2 05/15] ARM: dts: aspeed: Add PECI controller nodes Iwona Winiarska
2021-08-03 11:31 ` [PATCH v2 06/15] peci: Add core infrastructure Iwona Winiarska
2021-08-25 22:58   ` Dan Williams
2021-08-26 22:40     ` Winiarska, Iwona
2021-08-03 11:31 ` [PATCH v2 07/15] peci: Add peci-aspeed controller driver Iwona Winiarska
2021-08-26  1:35   ` Dan Williams
2021-08-26 23:54     ` Winiarska, Iwona
2021-08-27 16:24       ` Dan Williams
2021-08-29 19:42         ` Winiarska, Iwona
2021-08-03 11:31 ` [PATCH v2 08/15] peci: Add device detection Iwona Winiarska
2021-08-27 19:01   ` Dan Williams
2021-11-15 22:18     ` Winiarska, Iwona
2021-08-03 11:31 ` [PATCH v2 09/15] peci: Add sysfs interface for PECI bus Iwona Winiarska
2021-08-27 19:11   ` Dan Williams
2021-11-15 22:19     ` Winiarska, Iwona
2021-08-03 11:31 ` [PATCH v2 10/15] peci: Add support for PECI device drivers Iwona Winiarska
2021-08-27 21:19   ` Dan Williams
2021-11-15 22:20     ` Winiarska, Iwona
2021-08-03 11:31 ` [PATCH v2 11/15] peci: Add peci-cpu driver Iwona Winiarska
2021-08-03 11:31 ` [PATCH v2 12/15] hwmon: peci: Add cputemp driver Iwona Winiarska
2021-08-03 15:24   ` Guenter Roeck
2021-08-04 10:43     ` Winiarska, Iwona
2021-08-03 11:31 ` [PATCH v2 13/15] hwmon: peci: Add dimmtemp driver Iwona Winiarska
2021-08-03 15:39   ` Guenter Roeck
2021-08-04 10:46     ` Winiarska, Iwona
2021-08-04 17:33       ` Guenter Roeck
2021-08-05 21:48         ` Winiarska, Iwona
2021-08-03 11:31 ` [PATCH v2 14/15] docs: hwmon: Document PECI drivers Iwona Winiarska
2021-08-03 11:31 ` [PATCH v2 15/15] docs: Add PECI documentation Iwona Winiarska
2021-08-05 12:17 ` [PATCH v2 00/15] Introduce PECI subsystem Greg Kroah-Hartman

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