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powernv: Fix VFIO support with PHB3 

I have recently found out that no iommu_groups could be found under
/sys/ on a P8. That prevents PCI passthrough from working.

During my investigation, I found out there seems to be a missing
iommu_register_group for PHB3. The following patch seems to fix the
problem. After applying it, I see iommu_groups under
/sys/kernel/iommu_groups/, and can also bind vfio-pci to an adapter,
which gives me a device at /dev/vfio/.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Thadeu Lima de Souza Cascardo 2013-12-09 14:41:01 -02:00 committed by Benjamin Herrenschmidt
parent 84953f969b
commit 08607afba6
1 changed files with 1 additions and 0 deletions
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1
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -720,6 +720,7 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE;
}
iommu_init_table(tbl, phb->hose->node);
iommu_register_group(tbl, pci_domain_nr(pe->pbus), pe->pe_number);
if (pe->pdev)
set_iommu_table_base(&pe->pdev->dev, tbl);