• Alexey Kardashevskiy's avatar
    powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group · 0eaf4def
    Alexey Kardashevskiy authored
    So far one TCE table could only be used by one IOMMU group. However
    IODA2 hardware allows programming the same TCE table address to
    multiple PE allowing sharing tables.
    
    This replaces a single pointer to a group in a iommu_table struct
    with a linked list of groups which provides the way of invalidating
    TCE cache for every PE when an actual TCE table is updated. This adds
    pnv_pci_link_table_and_group() and pnv_pci_unlink_table_and_group()
    helpers to manage the list. However without VFIO, it is still going
    to be a single IOMMU group per iommu_table.
    
    This changes iommu_add_device() to add a device to a first group
    from the group list of a table as it is only called from the platform
    init code or PCI bus notifier and at these moments there is only
    one group per table.
    
    This does not change TCE invalidation code to loop through all
    attached groups in order to simplify this patch and because
    it is not really needed in most cases. IODA2 is fixed in a later
    patch.
    
    This should cause no behavioural change.
    Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
    [aw: for the vfio related changes]
    Acked-by: default avatarAlex Williamson <alex.williamson@redhat.com>
    Reviewed-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
    Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    0eaf4def
pci-p5ioc2.c 7.43 KB