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    Subject[PATCH 1/6] driver core: Introduce device_iommu_mapped() function
    Date
    From: Joerg Roedel <jroedel@suse.de>

    Some places in the kernel check the iommu_group pointer in
    'struct device' in order to find ot whether a device is
    mapped by an IOMMU.

    This is not good way to make this check, as the pointer will
    be moved to 'struct dev_iommu_data'. This way to make the
    check is also not very readable.

    Introduce an explicit function to perform this check.

    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Acked-by: Robin Murphy <robin.murphy@arm.com>
    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    ---
    include/linux/device.h | 10 ++++++++++
    1 file changed, 10 insertions(+)

    diff --git a/include/linux/device.h b/include/linux/device.h
    index 1b25c7a43f4c..6cb4640b6160 100644
    --- a/include/linux/device.h
    +++ b/include/linux/device.h
    @@ -1058,6 +1058,16 @@ static inline struct device *kobj_to_dev(struct kobject *kobj)
    return container_of(kobj, struct device, kobj);
    }

    +/**
    + * device_iommu_mapped - Returns true when the device DMA is translated
    + * by an IOMMU
    + * @dev: Device to perform the check on
    + */
    +static inline bool device_iommu_mapped(struct device *dev)
    +{
    + return (dev->iommu_group != NULL);
    +}
    +
    /* Get the wakeup routines, which depend on struct device */
    #include <linux/pm_wakeup.h>

    --
    2.17.1
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