linux-kernel - Re: [PATCH v2 2/7] x86/boot: Introduce helpers for serial I/O

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Message-ID: <20190328142001.GD9224@smile.fi.intel.com>
Date:   Thu, 28 Mar 2019 16:20:01 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] x86/boot: Introduce helpers for serial I/O

On Thu, Mar 28, 2019 at 03:05:08PM +0100, Borislav Petkov wrote:
> On Thu, Mar 28, 2019 at 03:52:26PM +0200, Andy Shevchenko wrote:
> > It's not a generic serial_in()...
> 
> Why?

By name and by what it's handling (only byte accesses to I/O or MMIO).

> > What about mmio32 as next step?
> 
> Next step where? Is it part of your patches?

Not this series, but we have hardware that does MMIO32 accesses and yet using
non-standard address.

My point is, that doing branch(es) on each I/O call is not good as simple
calling the proper (pre-defined) I/O accessor.

-- 
With Best Regards,
Andy Shevchenko