On 12/06/2013 11:21 PM, Thadeu Lima de Souza Cascardo wrote: > 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 <casca...@linux.vnet.ibm.com> > --- > arch/powerpc/platforms/powernv/pci-ioda.c | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c > b/arch/powerpc/platforms/powernv/pci-ioda.c > index 084cdfa..2c6d173 100644 > --- a/arch/powerpc/platforms/powernv/pci-ioda.c > +++ b/arch/powerpc/platforms/powernv/pci-ioda.c > @@ -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);
This does not seem absolutely right - normally set_iommu_table_base() is replaced with set_iommu_table_base_and_group() or you will not see some devices in a group and this may make VFIO unhappy. But - if every single device gets assigned to some group, then we can push this to Frobisher and let people test in on power8. -- Alexey -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
