On Fri, May 01, 2015 at 01:32:12PM -0500, wdavis@xxxxxxxxxx wrote: > From: Will Davis <wdavis@xxxxxxxxxx> > > Hi, > > This patch series adds DMA APIs to map and unmap a struct resource to and from > a PCI device's IOVA domain, and implements the AMD, Intel, and nommu versions > of these interfaces. > > This solves a long-standing problem with the existing DMA-remapping interfaces, > which require that a struct page be given for the region to be mapped into a > device's IOVA domain. This requirement cannot support peer device BAR ranges, > for which no struct pages exist. > > The underlying implementations of map_page and map_sg convert the struct page > into its physical address anyway, so we just need a way to route the physical > address of the BAR region to these implementations. The new interfaces do this > by taking the struct resource describing a device's BAR region, from which the > physical address is derived. > > The Intel and nommu versions have been verified on a dual Intel Xeon E5405 > workstation. I'm in the process of obtaining hardware to test the AMD version > as well. Please review. Does it work if you boot with 'iommu=soft swiotlb=force' which will mandate an strict usage of the DMA API? > > Thanks, > Will > > Will Davis (6): > dma-debug: add checking for map/unmap_resource > DMA-API: Introduce dma_(un)map_resource > dma-mapping: pci: add pci_(un)map_resource > iommu/amd: Implement (un)map_resource > iommu/vt-d: implement (un)map_resource > x86: add pci-nommu implementation of map_resource > > arch/x86/kernel/pci-nommu.c | 17 +++++++ > drivers/iommu/amd_iommu.c | 76 ++++++++++++++++++++++++++------ > drivers/iommu/intel-iommu.c | 18 ++++++++ > include/asm-generic/dma-mapping-broken.h | 9 ++++ > include/asm-generic/dma-mapping-common.h | 34 ++++++++++++++ > include/asm-generic/pci-dma-compat.h | 14 ++++++ > include/linux/dma-debug.h | 20 +++++++++ > include/linux/dma-mapping.h | 7 +++ > lib/dma-debug.c | 48 ++++++++++++++++++++ > 9 files changed, 230 insertions(+), 13 deletions(-) > > -- > 2.3.7 > > _______________________________________________ > iommu mailing list > iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx > https://lists.linuxfoundation.org/mailman/listinfo/iommu -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
