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.
