NX 842 compression accelerator

NX-842 is a lossless on-chip data compression accelerator found on Power processor chips P7+, P8, and P9.
Two engines per processor socket has a combined throughput of 32 to 39 GBytes per second for compress and decompress.

User-space direct access to the accelerator will be supported on P9 Linux. Follow these URLs for more information:

https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-March/156078.html
https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-April/156106.html

For code:

https://github.com/sukadev/linux/tree/vas-kern-v8.1
https://github.com/sukadev/linux/tree/vas-kern-v8.1/tools/testing/selftests/powerpc/ftw
https://github.com/sukadev/linux/tree/vas-kern-v8.1/tools/testing/selftests/powerpc/user-nx842
https://github.com/sukadev/linux/tree/vas-kern-v8.1/Documentation/powerpc/ftw-api.txt