From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Henderson <rth@twiddle.net>
Subject: Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations
Date: Thu, 22 Jun 2017 14:20:43 -0700
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To: Logan Gunthorpe <logang@deltatee.com>, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-ntb@googlegroups.com, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-crypto@vger.kernel.org, dri-devel@lists.freedesktop.org
Cc: Arnd Bergmann <arnd@arndb.de>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Stephen Bates <sbates@raithlin.com>, Ivan Kokshaysky <ink@jurassic.park.msu.ru>, Matt Turner <mattst88@gmail.com>

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.