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    Subject[PATCH 07/10] iommu: Print default domain type on boot
    Date
    From: Joerg Roedel <jroedel@suse.de>

    Introduce a subsys_initcall for IOMMU code and use it to
    print the default domain type at boot.

    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    ---
    drivers/iommu/iommu.c | 30 +++++++++++++++++++++++++++++-
    1 file changed, 29 insertions(+), 1 deletion(-)

    diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
    index e1feb4061b8b..233bc22b487e 100644
    --- a/drivers/iommu/iommu.c
    +++ b/drivers/iommu/iommu.c
    @@ -93,12 +93,40 @@ struct iommu_group_attribute iommu_group_attr_##_name = \
    static LIST_HEAD(iommu_device_list);
    static DEFINE_SPINLOCK(iommu_device_lock);

    +/*
    + * Use a function instead of an array here because the domain-type is a
    + * bit-field, so an array would waste memory.
    + */
    +static const char *iommu_domain_type_str(unsigned int t)
    +{
    + switch (t) {
    + case IOMMU_DOMAIN_BLOCKED:
    + return "Blocked";
    + case IOMMU_DOMAIN_IDENTITY:
    + return "Passthrough";
    + case IOMMU_DOMAIN_UNMANAGED:
    + return "Unmanaged";
    + case IOMMU_DOMAIN_DMA:
    + return "Translated";
    + default:
    + return "Unknown";
    + }
    +}
    +
    +static int __init iommu_subsys_init(void)
    +{
    + pr_info("Default domain type: %s\n",
    + iommu_domain_type_str(iommu_def_domain_type));
    +
    + return 0;
    +}
    +subsys_initcall(iommu_subsys_init);
    +
    int iommu_device_register(struct iommu_device *iommu)
    {
    spin_lock(&iommu_device_lock);
    list_add_tail(&iommu->list, &iommu_device_list);
    spin_unlock(&iommu_device_lock);
    -
    return 0;
    }

    --
    2.17.1
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