On 24/02/2020 7:44 pm, Christoph Hellwig wrote:
Hi all,
this series provides support for remapping places uncached in-place in
the generic dma-direct code, and moves openrisc over from its own
in-place remapping scheme. The arm64 folks also had interest in such
a scheme to avoid problems with speculating into cache aliases.
Also all architectures that always use small page mappings for the
kernel and have non-coherent DMA should look into enabling this
scheme, as it is much more efficient than the vmap remapping.
Changes since v1:
- share the arch hook for inline remap and uncached segment support
For the whole series:
Reviewed-by: Robin Murphy <[email protected]>
I think we might ultimately want to fiddle around a bit more in
dma_direct_alloc_pages() to give ARCH_HAS_DMA_SET_UNCACHED clear
precedence over DMA_DIRECT_REMAP if they have to coexist, but let's land
these patches first as a solid foundation.
Thanks,
Robin.
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