[PATCH v5 11/13] xen: introduce xen_alloc/free_coherent_pages
Catalin Marinas
catalin.marinas at arm.com
Thu Sep 5 12:09:05 EDT 2013
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
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