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    SubjectRe: [PATCH RFC 0/3] API for 128-bit IO access
    On Wed, Jan 24, 2018 at 10:22:13AM +0000, Will Deacon wrote:
    > 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.

    Hi Will,

    Thanks for clarification.

    Could you elaborate, do you find 128-bit read/write API useless, or
    you just correct my comment?

    I think that ordered uniform 128-bit access API would be helpful, even
    if not atomic.

    Yury.

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