iommu/vt-d: Remove scalabe mode in domain_context_clear_one()

domain_context_clear_one() only handles the context entry teardown in
legacy mode. Remove the scalable mode check in it to avoid dead code.

Remove an unnecessary check in the code as well.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240305013305.204605-6-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel/iommu.c

@@ -2124,9 +2124,6 @@ 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) {
@@ -2134,14 +2131,7 @@ 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));
@@ -2152,9 +2142,6 @@ 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,