On Wed, Jun 29, 2022 at 11:59:43PM +0200, Heiko Stuebner wrote: > The Zicbom ISA-extension was ratified in november 2021 > and introduces instructions for dcache invalidate, clean > and flush operations. > > Implement cache management operations based on them. > > Of course not all cores will support this, so implement an > alternative-based mechanism that replaces empty instructions > with ones done around Zicbom instructions. > > As discussed in previous versions, assume the platform > being coherent by default so that non-coherent devices need > to get marked accordingly by firmware. The subject here seems somewhat odd. Yes, it does implement the low-level cache management ops, but more importantly it adds support for devices that are not DMA coherent. Otherwise looks good: Reviewed-by: Christoph Hellwig <hch@xxxxxx>
