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    Subject[PATCH v4 11/22] driver core: add per device iommu param
    Date
    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
    ---
    include/linux/device.h | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/include/linux/device.h b/include/linux/device.h
    index b093405..35d9f34 100644
    --- a/include/linux/device.h
    +++ b/include/linux/device.h
    @@ -41,6 +41,7 @@ struct iommu_ops;
    struct iommu_group;
    struct iommu_fwspec;
    struct dev_pin_info;
    +struct iommu_param;

    struct bus_attribute {
    struct attribute attr;
    @@ -872,6 +873,7 @@ struct dev_links_info {
    * device (i.e. the bus driver that discovered the device).
    * @iommu_group: IOMMU group the device belongs to.
    * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
    + * @iommu_param: Per device generic IOMMU runtime data
    *
    * @offline_disabled: If set, the device is permanently online.
    * @offline: Set after successful invocation of bus type's .offline().
    @@ -961,6 +963,7 @@ struct device {
    void (*release)(struct device *dev);
    struct iommu_group *iommu_group;
    struct iommu_fwspec *iommu_fwspec;
    + struct iommu_param *iommu_param;

    bool offline_disabled:1;
    bool offline:1;
    --
    2.7.4
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