Hi Lorenzo, On Mon, 2020-01-13 at 12:08 +0000, Lorenzo Pieralisi wrote: > On Fri, Jan 10, 2020 at 10:21:08AM -0700, Jon Derrick wrote: > > v2 Set: https://lore.kernel.org/linux-iommu/1578580256-3483-1-git-send-email-jonathan.derrick@xxxxxxxxx/T/#t > > v1 Set: https://lore.kernel.org/linux-iommu/20200107134125.GD30750@xxxxxxxxxx/T/#t > > > > VMD currently works with VT-d enabled by pointing DMA and IOMMU actions at the > > VMD endpoint. The problem with this approach is that the VMD endpoint's > > device-specific attributes, such as the DMA Mask Bits, are used instead. > > > > This set cleans up VMD by removing the override that redirects DMA map > > operations to the VMD endpoint. Instead it introduces a new DMA alias mechanism > > into the existing DMA alias infrastructure. > > > > v1 added a pointer in struct pci_dev that pointed to the DMA alias' struct > > pci_dev and did the necessary DMA alias and IOMMU modifications. > > > > v2 introduced a new weak function to reference the 'Direct DMA Alias', and > > removed the need to add a pointer in struct device or pci_dev. Weak functions > > are generally frowned upon when it's a single architecture implementation, so I > > am open to alternatives. > > > > v3 references the pci_dev rather than the struct device for the PCI > > 'Direct DMA Alias' (pci_direct_dma_alias()). This revision also allows > > pci_for_each_dma_alias() to call any DMA aliases for the Direct DMA alias > > device, though I don't expect the VMD endpoint to need intra-bus DMA aliases. > > > > Changes from v2: > > Uses struct pci_dev for PCI Device 'Direct DMA aliasing' (pci_direct_dma_alias) > > Allows pci_for_each_dma_alias to iterate over the alias mask of the 'Direct DMA alias' > > > > Changes from v1: > > Removed 1/5 & 2/5 misc fix patches that were merged > > Uses Christoph's staging/cleanup patches > > Introduce weak function rather than including pointer in struct device or pci_dev. > > > > Based on Joerg's next: > > https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git/ > > > > Jon Derrick (5): > > x86/pci: Add a to_pci_sysdata helper > > x86/PCI: Expose VMD's PCI Device in pci_sysdata > > PCI: Introduce pci_direct_dma_alias() > > PCI: vmd: Stop overriding dma_map_ops > > x86/pci: Remove X86_DEV_DMA_OPS > > > > arch/x86/Kconfig | 3 - > > arch/x86/include/asm/device.h | 10 --- > > arch/x86/include/asm/pci.h | 31 ++++----- > > arch/x86/pci/common.c | 45 ++---------- > > drivers/iommu/intel-iommu.c | 18 +++-- > > drivers/pci/controller/Kconfig | 1 - > > drivers/pci/controller/vmd.c | 152 +---------------------------------------- > > drivers/pci/pci.c | 19 +++++- > > drivers/pci/search.c | 7 ++ > > include/linux/pci.h | 1 + > > 10 files changed, 61 insertions(+), 226 deletions(-) > > Jon, Christoph, > > AFAICS this series supersedes/overrides: > > https://patchwork.kernel.org/patch/11114831/ > > Please let me know if that's correct, actually I was waiting to > see consensus on the patch above but if this series supersedes > it I would drop it from the PCI review queue. > > Thanks, > Lorenzo It does supercede it (with Christoph's blessing). By the way, I have been basing on Joerg's repo due to the v1/RFC IOMMU modifcations. As there's more pci work at this point, should I base it on Bjorn's repo instead?
