[PATCH RFC 0/3] riscv: Add DMA_COHERENT support

[Christoph Hellwig]

On Tue, May 18, 2021 at 11:54:31PM -0700, Drew Fustini wrote:
> Isn't it a good goal for Linux to support the capabilities present in
> the SoC that a currently being fab'd?
> 
> I believe the CMO group only started last year [1] so the RV64GC SoCs
> that are going into mass production this year would not have had the
> opporuntiy of utilizing any RISC-V ISA extension for handling cache
> management.

Then the vendors need to push harder.  This problem has been known
for years but ignored by the vendors.