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    Subject[PATCH 13/23] AMD IOMMU: add dma_supported callback
    Date
    This function determines if the AMD IOMMU implementation is responsible
    for a given device. So the DMA layer can get this information from the
    driver.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kernel/amd_iommu.c | 25 +++++++++++++++++++++++++
    1 files changed, 25 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
    index 71e20ad..0410be1 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -1205,6 +1205,30 @@ free_mem:
    }

    /*
    + * This function is called by the DMA layer to find out if we can handle a
    + * particular device. It is part of the dma_ops.
    + */
    +static int amd_iommu_dma_supported(struct device *dev, u64 mask)
    +{
    + u16 bdf;
    + struct pci_dev *pcidev;
    +
    + /* No device or no PCI device */
    + if (!dev || dev->bus != &pci_bus_type)
    + return 0;
    +
    + pcidev = to_pci_dev(dev);
    +
    + bdf = calc_devid(pcidev->bus->number, pcidev->devfn);
    +
    + /* Out of our scope? */
    + if (bdf > amd_iommu_last_bdf)
    + return 0;
    +
    + return 1;
    +}
    +
    +/*
    * The function for pre-allocating protection domains.
    *
    * If the driver core informs the DMA layer if a driver grabs a device
    @@ -1247,6 +1271,7 @@ static struct dma_mapping_ops amd_iommu_dma_ops = {
    .unmap_single = unmap_single,
    .map_sg = map_sg,
    .unmap_sg = unmap_sg,
    + .dma_supported = amd_iommu_dma_supported,
    };

    /*
    --
    1.5.6.4



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