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zbb
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V 27
2017-06-21T18:23:28.123290Z
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V 444
Introduce support for DMA coherent ARM platforms

- Inherit BUS_DMA_COHERENT flag from parent buses
- Use cacheable memory attributes on dma coherent platform
- Disable cache synchronization on coherent platform

Changes are based on ARMv8 busdma code and commit r299683.

Submitted by: Michal Mazur <mkm@semihalf.com>
Obtained from: Semihalf
Sponsored by: Stormshield
Reviewed by: ian
Differential revision: https://reviews.freebsd.org/D11201

END