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| Started by | David Gibson <david@gibson.dropbear.id.au> |
|---|---|
| First post | 2015-06-09 05:40 +0200 |
| Last post | 2015-06-09 05:40 +0200 |
| Articles | 1 — 1 participant |
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Re: [PATCH kernel v12 17/34] powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group David Gibson <david@gibson.dropbear.id.au> - 2015-06-09 05:40 +0200
| From | David Gibson <david@gibson.dropbear.id.au> |
|---|---|
| Date | 2015-06-09 05:40 +0200 |
| Subject | Re: [PATCH kernel v12 17/34] powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group |
| Message-ID | <pziyl-2Hk-9@gated-at.bofh.it> |
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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 <aik@ozlabs.ru> > [aw: for the vfio related changes] > Acked-by: Alex Williamson <alex.williamson@redhat.com> > Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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