On Mon, 13 Mar 2017, Stephen Warren wrote: > > Ideally the kernel would not create the uverbs device for DMA drivers > > on such architectures.. Is there a kernel API to detect cache > > incoherence? > > I'm not aware of any right now (although I don't deal with Linux MM much, so > probably wouldn't be). I am aware of dma_alloc_coherent(), and I assume that > must choose uncached/cached/... based on the HW's coherence, so perhaps that > information could be found. > > Once upon a time, we might have got away with assuming the answer based on > architecture, but I suspect that ARM==non-coherent is false in many cases > these days. CONFIG_HAVE_GENERIC_DMA_COHERENT? Look for DMA_COHERENT in the kernel header files -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
