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    Subject[PATCHv6 03/13] iommu/of: check if dependee iommu is ready or not
    Date
    IOMMU devices on the bus need to be poplulated first, then iommu
    master devices are done later.

    With CONFIG_OF_IOMMU, "iommus=" DT binding would be used to identify
    whether a device can be an iommu msater or not. If a device can, we'll
    defer to populate that device till an depending iommu device is
    populated.

    Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
    ---
    v6:
    Spinned off only of_iommu part from:
    [PATCHv5 2/9] driver/core: populate devices in order for IOMMUs

    v5:
    Use "iommus=" binding instread of arm,smmu's "#stream-id-cells".

    v4:
    This is newly added, and the successor of the following RFC:
    [RFC][PATCHv3+ 1/2] driver/core: Add of_iommu_attach()
    http://lists.linuxfoundation.org/pipermail/iommu/2013-November/006914.html
    ---
    drivers/iommu/of_iommu.c | 16 ++++++++++++++++
    include/linux/of_iommu.h | 6 ++++++
    2 files changed, 22 insertions(+)

    diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
    index 5d1aeb9..6ad4997e 100644
    --- a/drivers/iommu/of_iommu.c
    +++ b/drivers/iommu/of_iommu.c
    @@ -125,3 +125,19 @@ int of_get_dma_window(struct device_node *dn, const char *prefix, int index,
    return 0;
    }
    EXPORT_SYMBOL_GPL(of_get_dma_window);
    +
    +int of_iommu_attach(struct device *dev)
    +{
    + int i;
    + struct of_phandle_args args;
    +
    + of_property_for_each_phandle_with_args(dev->of_node, "iommus",
    + "#iommu-cells", i, &args) {
    + pr_debug("%s(i=%d) %s\n", __func__, i, dev_name(dev));
    +
    + if (!of_find_iommu_by_node(args.np))
    + return -EPROBE_DEFER;
    + }
    +
    + return 0;
    +}
    diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h
    index a0aa9d4..14c9a5c 100644
    --- a/include/linux/of_iommu.h
    +++ b/include/linux/of_iommu.h
    @@ -14,6 +14,7 @@ extern int of_get_dma_window(struct device_node *dn, const char *prefix,

    extern void iommu_add(struct iommu *iommu);
    extern void iommu_del(struct iommu *iommu);
    +extern int of_iommu_attach(struct device *dev);

    #else

    @@ -32,6 +33,11 @@ static inline void iommu_del(struct iommu *iommu)
    {
    }

    +static inline int of_iommu_attach(struct device *dev)
    +{
    + return 0;
    +}
    +
    #endif /* CONFIG_OF_IOMMU */

    #endif /* __OF_IOMMU_H */
    --
    1.8.1.5


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