> Hi, > > This is the fourth version of a patchset to add the DMA APIs necessary to > map and unmap a PCI device's BAR to and from another PCI device's IOVA > domain. This enables PCI peer-to-peer traffic on x86 platforms where an > IOMMU is enabled (this requires that peer-to-peer traffic be supported by > the underlying chipset as well, of course). > Bjorn, does this patch series adequately address the concerns with the previous versions? > Thanks, > Will > > v4: > - added HAS_DMA_P2P Kconfig option to guard new APIs, which are only > supported on x86 with this patch series > - added a new dma_peer_addr_t type to handle future platform support > where the dma_peer_addr_t needs to have the same width as the bus > address, which can be wider than the dma_addr_t returned by other > DMA APIs > - added a new dma_peer_mapping_error() and associated PCI wrapper to > detect errors returned via dma_map_peer_resource() API and its > PCI wrapper > - modified the interface of the new API to explicitly take the peer > device as an argument > - renamed the (un)map_resource APIs to (un)map_peer_resource, since > they directly receive a 'peer' argument now > - modified the new PCI interface to take the BAR index instead of the > actual struct resource > - modified the pci-nommu implementation to perform topology and ACS > checks before allowing > - modified both the AMD and Intel IOMMU implementations to require > that both devices be behind the same host bridge > - exposed a couple of preexisting PCI utility functions to aid in the > topology checks for all of the x86 implementations > > v3: http://www.spinics.net/lists/linux-pci/msg41703.html > - changed dma_map_resource() to BUG() if the map_resource DMA op is not > provided, instead of returning 0 > - updated documentation to remove requirement to check for 0 return value > as an error > - remove const keyword from struct dma_map_ops in new DMA APIs for > consistency with other APIs > > v2: http://www.spinics.net/lists/linux-pci/msg41192.html > - added documentation for the new DMA APIs > - fixed physical-to-bus address conversion in the nommu implementation > > v1: http://www.spinics.net/lists/linux-pci/msg40747.html > > > > Will Davis (12): > lib/Kconfig: add HAS_DMA_P2P for peer-to-peer support > linux/types.h: Add dma_peer_addr_t type > dma-debug: add checking for map/unmap_peer_resource > DMA-API: Introduce dma_(un)map_peer_resource > dma-mapping: pci: add pci_(un)map_peer_resource > DMA-API: Add peer resource mapping documentation > pci: expose pci_find_host_bridge() > iommu/amd: Implement (un)map_peer_resource > iommu/vt-d: implement (un)map_peer_resource > pci: add pci_find_common_upstream_dev() > x86: add pci-nommu implementation of map_peer_resource > x86: declare support for DMA P2P > > Documentation/DMA-API-HOWTO.txt | 46 ++++++++++++++- > Documentation/DMA-API.txt | 36 ++++++++++-- > arch/x86/Kconfig | 1 + > arch/x86/include/asm/dma-mapping.h | 18 +++++- > arch/x86/kernel/pci-nommu.c | 96 +++++++++++++++++++++++++++++++ > drivers/iommu/amd_iommu.c | 99 +++++++++++++++++++++++++++----- > drivers/iommu/intel-iommu.c | 38 ++++++++++++ > drivers/pci/host-bridge.c | 19 +----- > drivers/pci/search.c | 25 ++++++++ > include/asm-generic/dma-mapping-common.h | 43 ++++++++++++++ > include/asm-generic/pci-dma-compat.h | 23 ++++++++ > include/linux/dma-debug.h | 39 ++++++++++++- > include/linux/dma-mapping.h | 12 ++++ > include/linux/pci.h | 9 +++ > include/linux/types.h | 13 ++++- > lib/Kconfig | 5 ++ > lib/dma-debug.c | 86 ++++++++++++++++++++++++++- > 17 files changed, 564 insertions(+), 44 deletions(-) > > -- > 2.4.6 -- 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
