linux-kernel - Re: [PATCH 3/7] asm-generic/io.h: make ioread64 and iowrite64 universally available

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Date:   Thu, 22 Jun 2017 14:38:28 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-ntb@...glegroups.com, linux-alpha@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-crypto@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH 3/7] asm-generic/io.h: make ioread64 and iowrite64
 universally available

On 6/22/2017 2:36 PM, Alan Cox wrote:
> I think that makes sense for the platforms with that problem. I'm not
> sure there are many that can't do it for mmio at least. 486SX can't do it
> and I guess some ARM32 but I think almost everyone else can including
> most 32bit x86.
>
> What's more of a problem is a lot of platforms can do 64bit MMIO via
> ioread/write64 but not 64bit port I/O, and it's not clear how you
> represent that via an ioread/write API that abstracts it away.

In Patch 2, we call bad_io_access for anyone trying to do 64bit accesses 
on port I/O.

Logan