| Date | Thu, 5 Sep 2013 17:43:33 +0100 | From | Stefano Stabellini <> | Subject | Re: [PATCH v5 11/13] xen: introduce xen_alloc/free_coherent_pages |
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On Thu, 5 Sep 2013, Catalin Marinas wrote: > 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.
I see. Would it be better if I implemented xen_alloc_coherent_pages on armv8 by calling arm64_swiotlb_dma_ops.alloc?
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