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    Subject[PATCH 3/3] iommu/vt-d: Remove scalabe mode in domain_context_clear_one()
    Date
    domain_context_clear_one() only handles the context entry teardown in
    legacy mode. Remove the scalable mode check in it to avoid dead code.

    Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
    ---
    drivers/iommu/intel/iommu.c | 15 +--------------
    1 file changed, 1 insertion(+), 14 deletions(-)

    diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
    index d682eb6ad4d2..50eb9aed47cc 100644
    --- a/drivers/iommu/intel/iommu.c
    +++ b/drivers/iommu/intel/iommu.c
    @@ -2175,9 +2175,6 @@ static void domain_context_clear_one(struct device_domain_info *info, u8 bus, u8
    struct context_entry *context;
    u16 did_old;

    - if (!iommu)
    - return;
    -
    spin_lock(&iommu->lock);
    context = iommu_context_addr(iommu, bus, devfn, 0);
    if (!context) {
    @@ -2185,14 +2182,7 @@ static void domain_context_clear_one(struct device_domain_info *info, u8 bus, u8
    return;
    }

    - if (sm_supported(iommu)) {
    - if (hw_pass_through && domain_type_is_si(info->domain))
    - did_old = FLPT_DEFAULT_DID;
    - else
    - did_old = domain_id_iommu(info->domain, iommu);
    - } else {
    - did_old = context_domain_id(context);
    - }
    + did_old = context_domain_id(context);

    context_clear_entry(context);
    __iommu_flush_cache(iommu, context, sizeof(*context));
    @@ -2203,9 +2193,6 @@ static void domain_context_clear_one(struct device_domain_info *info, u8 bus, u8
    DMA_CCMD_MASK_NOBIT,
    DMA_CCMD_DEVICE_INVL);

    - if (sm_supported(iommu))
    - qi_flush_pasid_cache(iommu, did_old, QI_PC_ALL_PASIDS, 0);
    -
    iommu->flush.flush_iotlb(iommu,
    did_old,
    0,
    --
    2.34.1

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