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    SubjectRe: [PATCH v4 11/22] driver core: add per device iommu param
    On Thu, Mar 22, 2018 at 08:12:03PM -0700, Jacob Pan wrote:
    > DMA faults can be detected by IOMMU at device level. Adding a pointer
    > to struct device allows IOMMU subsystem to report relevant faults
    > back to the device driver for further handling.
    > For direct assigned device (or user space drivers), guest OS holds
    > responsibility to handle and respond per device IOMMU fault.
    > Therefore we need fault reporting mechanism to propagate faults beyond
    > IOMMU subsystem.
    >
    > There are two other IOMMU data pointers under struct device today, here
    > we introduce iommu_param as a parent pointer such that all device IOMMU
    > data can be consolidated here. The idea was suggested here by Greg KH
    > and Joerg. The name iommu_param is chosen here since iommu_data has been used.
    >
    > Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
    > Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
    > Link: https://lkml.org/lkml/2017/10/6/81

    Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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