[PATCH kernel] powerpc/powernv/sriov: Register IOMMU groups for VFs
Alexey Kardashevskiy
aik at ozlabs.ru
Mon Feb 18 17:43:35 AEDT 2019
On 18/02/2019 16:58, 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 at ozlabs.ru>
Forgot this:
Reported-by: Santwana Samantray<santwana.samantray at in.ibm.com>
> ---
>
> 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:
>
--
Alexey
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