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Date: Wed, 31 Jul 2013 20:44:01 +0100 From: Stefano Stabellini <stefano.stabellini@...citrix.com> To: Stefano Stabellini <stefano.stabellini@...citrix.com> CC: <xen-devel@...ts.xensource.com>, <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, Ian Campbell <Ian.Campbell@...rix.com> Subject: Re: [PATCH RFC 0/8] enable swiotlb-xen on arm and arm64 Although the series should be enough to demonstrate the concept, it contains a couple of errors. I'll send an update. On Wed, 31 Jul 2013, Stefano Stabellini wrote: > Hi all, > this patch series enables xen-swiotlb on arm and arm64. > > Considering that all guests, including dom0, run on xen on arm with > second stage translation enabled, it follows that without an IOMMU no > guests could actually drive the hardware. > > The solution for platforms without an IOMMU is to use swiotlb-xen, > adapted to autotranslate guests. swiotlb-xen provides a set of dma_ops > that can be used by Linux to setup a contiguous buffer in stage-2 > addresses and use it for dma operations. > Basically Linux asks Xen to make a buffer contiguous and gets the > machine address for it. This buffer is going to be used by lib/swiotlb.c > to allocate bounce buffers. > > > The first 3 patches lay the groundwork on arm and arm64 to have > alternative dma_ops and swiotlb. > > The forth patch moves Xen initialization earlier so that we already know > whether we are running on Xen at the time of initializing dma_ops on the > platform. > > The following patches adapt swiotlb-xen to autotranslate guests (guest > with second stage translation in hardware) and provide an arm > implementation of xen_create_contiguous_region. > > > Feedback is very welcome. > Cheers, > > Stefano > > > Stefano Stabellini (8): > arm: make SWIOTLB available > arm: introduce a global dma_ops pointer > arm64: do not initialize arm64_swiotlb if dma_ops is already set > xen/arm,arm64: move Xen initialization earlier > xen: introduce XENMEM_get_dma_buf and xen_put_dma_buf > xen: make xen_create_contiguous_region return the dma address > swiotlb-xen: support autotranslate guests > xen/arm,arm64: enable SWIOTLB_XEN > > arch/arm/Kconfig | 8 ++ > arch/arm/common/dmabounce.c | 10 +- > arch/arm/include/asm/dma-mapping.h | 27 ++++++- > arch/arm/include/asm/xen/hypervisor.h | 6 ++ > arch/arm/include/asm/xen/page.h | 2 + > arch/arm/kernel/setup.c | 2 + > arch/arm/mm/dma-mapping.c | 3 + > arch/arm/xen/Makefile | 2 +- > arch/arm/xen/enlighten.c | 24 ++++-- > arch/arm/xen/mm.c | 118 ++++++++++++++++++++++++++ > arch/arm64/Kconfig | 1 + > arch/arm64/kernel/setup.c | 2 + > arch/arm64/mm/dma-mapping.c | 2 + > arch/arm64/xen/Makefile | 2 +- > arch/x86/xen/mmu.c | 4 +- > drivers/xen/Kconfig | 1 - > drivers/xen/swiotlb-xen.c | 147 +++++++++++++++++++++++++++++---- > include/xen/interface/memory.h | 62 ++++++++++++++ > include/xen/xen-ops.h | 3 +- > 19 files changed, 391 insertions(+), 35 deletions(-) > create mode 100644 arch/arm/xen/mm.c > -- 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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