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    Subject[PATCH 2/3] iommu-api: Extension to check for interrupt remapping
    Date
    From: Tom Lyon <pugs@cisco.com>

    This patch allows IOMMU users to determine whether the
    hardware and software support safe, isolated interrupt
    remapping. Not all Intel IOMMUs have the hardware, and the
    software for AMD is not there yet.

    Signed-off-by: Tom Lyon <pugs@cisco.com>
    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    drivers/pci/intel-iommu.c | 2 ++
    include/linux/iommu.h | 1 +
    2 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
    index c9171be..6a5af18 100644
    --- a/drivers/pci/intel-iommu.c
    +++ b/drivers/pci/intel-iommu.c
    @@ -3698,6 +3698,8 @@ static int intel_iommu_domain_has_cap(struct iommu_domain *domain,

    if (cap == IOMMU_CAP_CACHE_COHERENCY)
    return dmar_domain->iommu_snooping;
    + if (cap == IOMMU_CAP_INTR_REMAP)
    + return intr_remapping_enabled;

    return 0;
    }
    diff --git a/include/linux/iommu.h b/include/linux/iommu.h
    index be22ad8..0a2ba40 100644
    --- a/include/linux/iommu.h
    +++ b/include/linux/iommu.h
    @@ -30,6 +30,7 @@ struct iommu_domain {
    };

    #define IOMMU_CAP_CACHE_COHERENCY 0x1
    +#define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */

    struct iommu_ops {
    int (*domain_init)(struct iommu_domain *domain);
    --
    1.7.0.4



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