On Wed, Jan 24, 2018 at 02:02:35PM +0000, James Hogan wrote:
> On Thu, Nov 16, 2017 at 04:35:55PM +0800, Huacai Chen wrote:
> > To support coherent & non-coherent DMA co-exsistance, we should add
> > cache_sync to loongson_dma_map_ops.
> >
> > Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
>
> I presume this was broken by commit c9eb6172c328 ("dma-mapping: turn
> dma_cache_sync into a dma_map_ops method") in 4.15-rc1? (Christoph Cc'd)
I don't think that is the case.
In mips only mips_default_dma_map_ops supports DMA_ATTR_NON_CONSISTENT,
and mips_default_dma_map_ops grew support for the dma_cache_sync
operation.
Neither Octeon nor longsoon respect the DMA_ATTR_NON_CONSISTENT argument
to dma_alloc_attrs, so there is no point in implementing dma_cache_sync
for them.
