From: Stefano Stabellini Date: Wed, 9 Oct 2013 17:18:14 +0000 (+0000) Subject: xen: introduce xen_alloc/free_coherent_pages X-Git-Tag: v3.13-rc1~81^2~2^2~8 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6fe76c58c358498b91d21f0ca8054f6aa6e672d;p=pandora-kernel.git xen: introduce xen_alloc/free_coherent_pages xen_swiotlb_alloc_coherent needs to allocate a coherent buffer for cpu and devices. On native x86 is sufficient to call __get_free_pages in order to get a coherent buffer, while on ARM (and potentially ARM64) we need to call the native dma_ops->alloc implementation. Introduce xen_alloc_coherent_pages to abstract the arch specific buffer allocation. Similarly introduce xen_free_coherent_pages to free a coherent buffer: on x86 is simply a call to free_pages while on ARM and ARM64 is arm_dma_ops.free. Signed-off-by: Stefano Stabellini Changes in v7: - rename __get_dma_ops to __generic_dma_ops; - call __generic_dma_ops(hwdev)->alloc/free on arm64 too. Changes in v6: - call __get_dma_ops to get the native dma_ops pointer on arm. --- Reading git-diff-tree failed