Messages in this thread | | | From | Heiko Stübner <> | Subject | Re: [PATCH 2/3] riscv: Implement Zicbom-based cache management operations | Date | Fri, 17 Jun 2022 10:30:51 +0200 |
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Am Donnerstag, 16. Juni 2022, 14:11:57 CEST schrieb Christoph Hellwig: > On Thu, Jun 16, 2022 at 02:09:47PM +0200, Heiko Stübner wrote: > > My guess was that new platforms implementing cache-management will want > > to be non-coherent by default? > > No. Cache incoherent DMA is absolutely horrible and almost impossible > to get right for the corner cases. It is a cost cutting measure seen on > cheap SOCs and mostly avoided for more enterprise grade products.
ok, then we'll do it the other way around as suggested :-) . Coherent by default and marking the non-coherent parts.
DT people on IRC yesterday were also open to adding a dma-noncoherent property for that case.
Heiko
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