linux-kernel - Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations

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Date:   Thu, 22 Jun 2017 14:20:43 -0700
From:   Richard Henderson <rth@...ddle.net>
To:     Logan Gunthorpe <logang@...tatee.com>,
        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
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Bates <sbates@...thlin.com>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>
Subject: Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations

On 06/22/2017 09:48 AM, Logan Gunthorpe wrote:
> Alpha implements its own io operation and doesn't use the
> common library. Thus to make ioread64 and iowrite64 globally
> available we need to add implementations for alpha.
> 
> For this, we simply use calls that chain two 32-bit operations.
> (mostly because I don't really understand the alpha architecture.)

It's not difficult to provide this interface[*].  I believe the only reason I 
didn't do so from the beginning is that it wasn't used.



r~


* At least for systems other than Jensen, which cannot generate 64-bit I/O.  On 
the other hand, Jensen doesn't have PCI (EISA only), and so won't have any 
devices that care.