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Date: Mon, 9 Dec 2013 16:50:57 +0000 From: Ian Campbell <Ian.Campbell@...rix.com> To: Stefano Stabellini <stefano.stabellini@...citrix.com> CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <xen-devel@...ts.xensource.com>, <konrad.wilk@...cle.com>, <catalin.marinas@....com>, <Will.Deacon@....com> Subject: Re: [PATCH] xen/arm64: do not call the swiotlb functions twice On Mon, 2013-12-09 at 16:06 +0000, Stefano Stabellini wrote: > On arm64 the dma_map_ops implementation is based on the swiotlb. > swiotlb-xen, used by default in dom0 on Xen, is also based on the > swiotlb. > > Avoid calling into the default arm64 dma_map_ops functions from > xen_dma_map_page, xen_dma_unmap_page, xen_dma_sync_single_for_cpu, and > xen_dma_sync_single_for_device otherwise we end up calling into the > swiotlb twice. > > When arm64 gets a non-swiotlb based implementation of dma_map_ops, we'll > probably have to reintroduce dma_map_ops calls in page-coherent.h. > > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com> > CC: catalin.marinas@....com > CC: Will.Deacon@....com Tested-by: Ian Campbell <ian.campbell@...rix.com> Ian. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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