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    Subject[PATCH v2 15/17] iommu/arm-smmu-v3: Implement arm_smmu_get_msi_mapping_domain
    Date
    In a 1-stage translation setup, a device is attached to an iommu_domain
    (ARM_SMMU_DOMAIN_S1) that is a kernel-managed domain.

    In a 2-stage translation setup, a device is attached to an iommu_domain
    (ARM_SMMU_DOMAIN_S1) that is IOMMU_DOMAIN_NESTED type, which must have
    a valid "s2" pointer for an iommu_domain (ARM_SMMU_DOMAIN_S2) that is
    a kernel-managed domain.

    The MSI mappings for dma-iommu core to use are located in a domain that
    must be a kernel-managed one. Thus, add a function to return the correct
    iommu_domain pointer accordingly.

    Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
    ---
    drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 ++++++++++++
    1 file changed, 12 insertions(+)

    diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
    index 3d150924581f..5fe7fed825d0 100644
    --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
    +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
    @@ -2095,6 +2095,17 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
    kfree(smmu_domain);
    }

    +static struct iommu_domain *
    +arm_smmu_get_msi_mapping_domain(struct iommu_domain *domain)
    +{
    + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
    +
    + if (smmu_domain->s2)
    + return &smmu_domain->s2->domain;
    +
    + return domain;
    +}
    +
    static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
    struct arm_smmu_master *master,
    struct io_pgtable_cfg *pgtbl_cfg)
    @@ -2976,6 +2987,7 @@ static void arm_smmu_remove_dev_pasid(struct device *dev, ioasid_t pasid)
    static const struct iommu_domain_ops arm_smmu_nested_domain_ops = {
    .attach_dev = arm_smmu_attach_dev,
    .free = arm_smmu_domain_free,
    + .get_msi_mapping_domain = arm_smmu_get_msi_mapping_domain,
    };

    /**
    --
    2.40.1
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