On Mon, Feb 18, 2019 at 04:58:01PM +1100, Alexey Kardashevskiy wrote: > The compound IOMMU group rework moved iommu_register_group() together in > pnv_pci_ioda_setup_iommu_api() (which is a part of ppc_md.pcibios_fixup). > As the result, pnv_ioda_setup_bus_iommu_group() does not create groups > any more, it only adds devices to groups. > > This works fine for boot time devices. However IOMMU groups for SRIOV's > VFs were added by pnv_ioda_setup_bus_iommu_group() so this got broken: > pnv_tce_iommu_bus_notifier() expects a group to be registered for VF > and it is not. > > This adds missing group registration and adds a NULL pointer check into > the bus notifier so we won't stop in xmon if there is no group, although > it is not expected to happen now. > > Fixes: 0bd971676e68 "powerpc/powernv/npu: Add compound IOMMU groups" > Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx> Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> > --- > > Fixes https://bugzilla.linux.ibm.com/show_bug.cgi?id=175550 > "Kernel Oops while creating SRIOV VF's." > > > --- > arch/powerpc/platforms/powernv/pci-ioda.c | 2 ++ > arch/powerpc/platforms/powernv/pci.c | 2 ++ > 2 files changed, 4 insertions(+) > > diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c > index 7db3119..145373f 100644 > --- a/arch/powerpc/platforms/powernv/pci-ioda.c > +++ b/arch/powerpc/platforms/powernv/pci-ioda.c > @@ -1593,6 +1593,8 @@ static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs) > > pnv_pci_ioda2_setup_dma_pe(phb, pe); > #ifdef CONFIG_IOMMU_API > + iommu_register_group(&pe->table_group, > + pe->phb->hose->global_number, pe->pe_number); > pnv_ioda_setup_bus_iommu_group(pe, &pe->table_group, NULL); > #endif > } > diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c > index 45fb70b..ef9448a 100644 > --- a/arch/powerpc/platforms/powernv/pci.c > +++ b/arch/powerpc/platforms/powernv/pci.c > @@ -1147,6 +1147,8 @@ static int pnv_tce_iommu_bus_notifier(struct notifier_block *nb, > return 0; > > pe = &phb->ioda.pe_array[pdn->pe_number]; > + if (!pe->table_group.group) > + return 0; > iommu_add_device(&pe->table_group, dev); > return 0; > case BUS_NOTIFY_DEL_DEVICE: -- 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
Attachment:
signature.asc
Description: PGP signature
