Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755542Ab3HOLK0 (ORCPT ); Thu, 15 Aug 2013 07:10:26 -0400 Received: from smtp.citrix.com ([66.165.176.89]:61175 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753697Ab3HOLKW (ORCPT ); Thu, 15 Aug 2013 07:10:22 -0400 X-IronPort-AV: E=Sophos;i="4.89,885,1367971200"; d="scan'208";a="44510739" Date: Thu, 15 Aug 2013 12:10:13 +0100 From: Stefano Stabellini X-X-Sender: sstabellini@kaball.uk.xensource.com To: CC: , , Konrad Rzeszutek Wilk , Stefano Stabellini , Ian Campbell Subject: [PATCH v4 0/10] enable swiotlb-xen on arm and arm64 Message-ID: User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4084 Lines: 102 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 5 patches lay the groundwork on arm and arm64 to have alternative dma_ops and swiotlb. The sixth 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 Changes in v4: - rename XENMEM_get_dma_buf to XENMEM_exchange_and_pin; - rename XENMEM_put_dma_buf to XENMEM_unpin; - improve the documentation of the new hypercalls; - add a note about out.address_bits for XENMEM_exchange; - code style fixes; - add err_out label in xen_dma_add_entry; - remove INVALID_ADDRESS, use DMA_ERROR_CODE instead; - add in-code comments regarding the usage of xen_dma_seg[0].dma_addr. Changes in v3: - add a patch to compile SWIOTLB without CONFIG_NEED_SG_DMA_LENGTH; - add a patch to compile SWIOTLB_XEN without CONFIG_NEED_SG_DMA_LENGTH; - arm/dma_capable: do not treat dma_mask as a limit; - arm/dmabounce: keep using arm_dma_ops; - add missing __init in xen_early_init declaration; - many code style and name changes in swiotlb-xen.c; - improve error checks in xen_dma_add_entry; - warn on XENMEM_put_dma_buf failures. Changes in v2: - fixed a couple of errors in xen_bus_to_phys, xen_phys_to_bus and xen_swiotlb_fixup. EUNBONG SONG (1): swiotlb: replace dma_length with sg_dma_len() macro Stefano Stabellini (9): swiotlb-xen: replace dma_length with sg_dma_len() macro 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_exchange_and_pin and XENMEM_unpin xen: make xen_create_contiguous_region return the dma address swiotlb-xen: support autotranslate guests xen/arm,arm64: enable SWIOTLB_XEN arch/arm/Kconfig | 7 + arch/arm/include/asm/dma-mapping.h | 33 ++++++- arch/arm/include/asm/xen/hypervisor.h | 8 ++ 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 | 117 +++++++++++++++++++ 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 | 198 +++++++++++++++++++++++++++++---- include/xen/interface/memory.h | 37 ++++++ include/xen/xen-ops.h | 3 +- lib/swiotlb.c | 8 +- 19 files changed, 418 insertions(+), 38 deletions(-) create mode 100644 arch/arm/xen/mm.c git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen.git swiotlb-xen-4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/