On Fri, Jun 05, 2015 at 04:35:09PM +1000, Alexey Kardashevskiy wrote: > 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: Alexey Kardashevskiy <a...@ozlabs.ru> > [aw: for the vfio related changes] > Acked-by: Alex Williamson <alex.william...@redhat.com> > Reviewed-by: Gavin Shan <gws...@linux.vnet.ibm.com>
Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
--
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