• Alexey Kardashevskiy's avatar
    vfio: powerpc/spapr: powerpc/powernv/ioda: Define and implement DMA windows API · 4793d65d
    Alexey Kardashevskiy authored
    This extends iommu_table_group_ops by a set of callbacks to support
    dynamic DMA windows management.
    
    create_table() creates a TCE table with specific parameters.
    it receives iommu_table_group to know nodeid in order to allocate
    TCE table memory closer to the PHB. The exact format of allocated
    multi-level table might be also specific to the PHB model (not
    the case now though).
    This callback calculated the DMA window offset on a PCI bus from @num
    and stores it in a just created table.
    
    set_window() sets the window at specified TVT index + @num on PHB.
    
    unset_window() unsets the window from specified TVT.
    
    This adds a free() callback to iommu_table_ops to free the memory
    (potentially a tree of tables) allocated for the TCE table.
    
    create_table() and free() are supposed to be called once per
    VFIO container and set_window()/unset_window() are supposed to be
    called for every group in a container.
    
    This adds IOMMU capabilities to iommu_table_group such as default
    32bit window parameters and others. This makes use of new values in
    vfio_iommu_spapr_tce. IODA1/P5IOC2 do not support DDW so they do not
    advertise pagemasks to the userspace.
    Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
    Acked-by: default avatarAlex Williamson <alex.williamson@redhat.com>
    Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    4793d65d
vfio_iommu_spapr_tce.c 15.9 KB