Am 23.07.19 um 01:08 schrieb Logan Gunthorpe: > As discussed on the list previously, in order to fully support the > whitelist Christian added with the IOMMU, we must ensure that we > map any buffer going through the IOMMU with an aprropriate dma_map > call. This patchset accomplishes this by cleaning up the output of > upstream_bridge_distance() to better indicate the mapping requirements, > caching these requirements in an xarray, then looking them up at map > time and applying the appropriate mapping method. > > After this patchset, it's possible to use the NVMe-of P2P support to > transfer between devices without a switch on the whitelisted root > complexes. A couple Intel device I have tested this on have also > been added to the white list. > > Most of the changes are contained within the p2pdma.c, but there are > a few minor touches to other subsystems, mostly to add support > to call an unmap function. > > The final patch in this series demonstrates a possible > pci_p2pdma_map_resource() function that I expect Christian will need > but does not have any users at this time so I don't intend for it to be > considered for merging. > > This patchset is based on 5.3-rc1 and a git branch is available here: > > https://github.com/sbates130272/linux-p2pmem/ p2pdma_rc_map_v1 I reviewed patches #1-#3 and #14. Feel free to stick an Acked-by: Christian König <christian.koenig@xxxxxxx> to the rest, but I'm not really deep into the NVMe P2P handling here. Regards, Christian. > > -- > > Logan Gunthorpe (14): > PCI/P2PDMA: Add constants for not-supported result > upstream_bridge_distance() > PCI/P2PDMA: Factor out __upstream_bridge_distance() > PCI/P2PDMA: Apply host bridge white list for ACS > PCI/P2PDMA: Cache the result of upstream_bridge_distance() > PCI/P2PDMA: Factor out host_bridge_whitelist() > PCI/P2PDMA: Add whitelist support for Intel Host Bridges > PCI/P2PDMA: Add the provider's pci_dev to the dev_pgmap struct > PCI/P2PDMA: Add attrs argument to pci_p2pdma_map_sg() > PCI/P2PDMA: Introduce pci_p2pdma_unmap_sg() > PCI/P2PDMA: Factor out __pci_p2pdma_map_sg() > PCI/P2PDMA: dma_map P2PDMA map requests that traverse the host bridge > PCI/P2PDMA: No longer require no-mmu for host bridge whitelist > PCI/P2PDMA: Update documentation for pci_p2pdma_distance_many() > PCI/P2PDMA: Introduce pci_p2pdma_[un]map_resource() > > drivers/infiniband/core/rw.c | 6 +- > drivers/nvme/host/pci.c | 10 +- > drivers/pci/p2pdma.c | 400 +++++++++++++++++++++++++++-------- > include/linux/memremap.h | 1 + > include/linux/pci-p2pdma.h | 28 ++- > 5 files changed, 341 insertions(+), 104 deletions(-) > > -- > 2.20.1
