[PATCH kernel] powerpc/iommu: Set default DMA offset in dma_dev_setup

Gavin Shan gwshan at linux.vnet.ibm.com
Thu Aug 27 16:16:35 AEST 2015

On Thu, Aug 27, 2015 at 04:01:16PM +1000, Alexey Kardashevskiy wrote:
>"powerpc/iommu: Cleanup setting of DMA base/offset" expects that
>the default DMA offset is set from pnv_ioda_setup_bus_dma() which
>is correct unless it is SRIOV where the code flow is different - at
>the moment when pnv_ioda_setup_bus_dma() is called, there is no PE for
>the just created VF.

The PEs for VFs are ready at the moment. We don't have pci_dev for
VFs actually.

>This adds missing set_dma_offset() to pnv_pci_ioda_dma_dev_setup()
>to cover the case of SRIOV.
>Note that we still need set_dma_offset() in pnv_ioda_setup_bus_dma()
>as at the boot time pnv_pci_ioda_dma_dev_setup() is called when no PE
>was created yet, this happens at the PHB fixup stage.
>Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>

Reviewed-by: Gavin Shan <gwshan at linux.vnet.ibm.com>


>Makes sense to squash it to "powerpc/iommu: Cleanup setting of DMA base/offset".
> arch/powerpc/platforms/powernv/pci-ioda.c | 1 +
> 1 file changed, 1 insertion(+)
>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
>index 2c286b57..af875c1 100644
>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>@@ -1590,6 +1590,7 @@ static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev
> 	pe = &phb->ioda.pe_array[pdn->pe_number];
> 	WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops);
>+	set_dma_offset(&pdev->dev, pe->tce_bypass_base);
> 	set_iommu_table_base(&pdev->dev, pe->table_group.tables[0]);
> 	/*
> 	 * Note: iommu_add_device() will fail here as

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