linux-kernel - Re: [PATCH RFC 0/3] API for 128-bit IO access

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Message-ID: <20180124102212.GC20586@arm.com>
Date:   Wed, 24 Jan 2018 10:22:13 +0000
From:   Will Deacon <will.deacon@....com>
To:     Yury Norov <ynorov@...iumnetworks.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrew Pinski <Andrew.Pinski@...ium.com>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Geethasowjanya Akula <Geethasowjanya.Akula@...ium.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Sunil Goutham <Sunil.Goutham@...ium.com>
Subject: Re: [PATCH RFC 0/3] API for 128-bit IO access

On Wed, Jan 24, 2018 at 12:05:16PM +0300, Yury Norov wrote:
> This series adds API for 128-bit memory IO access and enables it for ARM64.
> The original motivation for 128-bit API came from new Cavium network device
> driver. The hardware requires 128-bit access to make things work. See
> description in patch 3 for details.
> 
> Also, starting from ARMv8.4, stp and ldp instructions become atomic, and
> API for 128-bit access would be helpful in core arm64 code.

Only for normal, cacheable memory, so they're not suitable for IO accesses
as you're proposing here.

Will