• Alexey Kardashevskiy's avatar
    powerpc/spapr: vfio: Replace iommu_table with iommu_table_group · b348aa65
    Alexey Kardashevskiy authored
    Modern IBM POWERPC systems support multiple (currently two) TCE tables
    per IOMMU group (a.k.a. PE). This adds a iommu_table_group container
    for TCE tables. Right now just one table is supported.
    
    This defines iommu_table_group struct which stores pointers to
    iommu_group and iommu_table(s). This replaces iommu_table with
    iommu_table_group where iommu_table was used to identify a group:
    - iommu_register_group();
    - iommudata of generic iommu_group;
    
    This removes @data from iommu_table as it_table_group provides
    same access to pnv_ioda_pe.
    
    For IODA, instead of embedding iommu_table, the new iommu_table_group
    keeps pointers to those. The iommu_table structs are allocated
    dynamically.
    
    For P5IOC2, both iommu_table_group and iommu_table are embedded into
    PE struct. As there is no EEH and SRIOV support for P5IOC2,
    iommu_free_table() should not be called on iommu_table struct pointers
    so we can keep it embedded in pnv_phb::p5ioc2.
    
    For pSeries, this replaces multiple calls of kzalloc_node() with a new
    iommu_pseries_alloc_group() helper and stores the table group struct
    pointer into the pci_dn struct. For release, a iommu_table_free_group()
    helper is added.
    
    This moves iommu_table struct allocation from SR-IOV code to
    the generic DMA initialization code in pnv_pci_ioda_setup_dma_pe and
    pnv_pci_ioda2_setup_dma_pe as this is where DMA is actually initialized.
    This change is here because those lines had to be changed anyway.
    
    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 avatarDavid Gibson <david@gibson.dropbear.id.au>
    Reviewed-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    b348aa65
iommu.c 37 KB