On Thu, Sep 16, 2021 at 05:40:43PM -0600, Logan Gunthorpe wrote: > +enum pci_p2pdma_map_type { > + /* > + * PCI_P2PDMA_MAP_UNKNOWN: Used internally for indicating the mapping > + * type hasn't been calculated yet. Functions that return this enum > + * never return this value. > + */ > + PCI_P2PDMA_MAP_UNKNOWN = 0, > + > + /* > + * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will > + * traverse the host bridge and the host bridge is not in the > + * whitelist. DMA Mapping routines should return an error when
I gather we are supposed to type allowlist now > + * this is returned. > + */ > + PCI_P2PDMA_MAP_NOT_SUPPORTED, > + > + /* > + * PCI_P2PDMA_BUS_ADDR: Indicates that two devices can talk to > + * eachother directly through a PCI switch and the transaction will 'each other' > + * not traverse the host bridge. Such a mapping should program > + * the DMA engine with PCI bus addresses. > + */ > + PCI_P2PDMA_MAP_BUS_ADDR, > + > + /* > + * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: Indicates two devices can talk > + * to eachother, but the transaction traverses a host bridge on the 'each other' > + * whitelist. In this case, a normal mapping either with CPU physical > + * addresses (in the case of dma-direct) or IOVA addresses (in the > + * case of IOMMUs) should be used to program the DMA engine. > + */ > + PCI_P2PDMA_MAP_THRU_HOST_BRIDGE, > +}; Reviewed-by: Jason Gunthorpe <j...@nvidia.com> Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu