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    Subject[PATCH v8 08/13] iommu: Add is_attach_deferred call-back to iommu-ops
    Date
    This new call-back will be used to check if the domain attach need be
    deferred for now. If yes, the domain attach/detach will return directly.

    Signed-off-by: Baoquan He <bhe@redhat.com>
    ---
    drivers/iommu/iommu.c | 8 ++++++++
    include/linux/iommu.h | 1 +
    2 files changed, 9 insertions(+)

    diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
    index 3f6ea160afed..86581b115b92 100644
    --- a/drivers/iommu/iommu.c
    +++ b/drivers/iommu/iommu.c
    @@ -1283,6 +1283,10 @@ static int __iommu_attach_device(struct iommu_domain *domain,
    struct device *dev)
    {
    int ret;
    + if ((domain->ops->is_attach_deferred != NULL) &&
    + domain->ops->is_attach_deferred(domain, dev))
    + return 0;
    +
    if (unlikely(domain->ops->attach_dev == NULL))
    return -ENODEV;

    @@ -1324,6 +1328,10 @@ EXPORT_SYMBOL_GPL(iommu_attach_device);
    static void __iommu_detach_device(struct iommu_domain *domain,
    struct device *dev)
    {
    + if ((domain->ops->is_attach_deferred != NULL) &&
    + domain->ops->is_attach_deferred(domain, dev))
    + return;
    +
    if (unlikely(domain->ops->detach_dev == NULL))
    return;

    diff --git a/include/linux/iommu.h b/include/linux/iommu.h
    index 2cb54adc4a33..63983c9e6c3a 100644
    --- a/include/linux/iommu.h
    +++ b/include/linux/iommu.h
    @@ -225,6 +225,7 @@ struct iommu_ops {
    u32 (*domain_get_windows)(struct iommu_domain *domain);

    int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
    + bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);

    unsigned long pgsize_bitmap;
    };
    --
    2.5.5
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