| Date | Thu, 5 Sep 2013 17:09:05 +0100 | From | Catalin Marinas <> | Subject | Re: [PATCH v5 11/13] xen: introduce xen_alloc/free_coherent_pages |
| |
On Thu, Aug 29, 2013 at 07:32:32PM +0100, Stefano Stabellini wrote: > xen_swiotlb_alloc_coherent needs to allocate a coherent buffer for cpu > and devices. On native x86 and ARMv8 is sufficient to call > __get_free_pages in order to get a coherent buffer, while on ARM we need > to call arm_dma_ops.alloc.
Don't bet on this for ARMv8. It's not mandated for the architecture, so at some point some SoC will require non-cacheable buffers for coherency.
-- Catalin
|