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

> From: Lu Baolu <baolu.lu@linux.intel.com>
> Sent: Thursday, February 29, 2024 5:48 PM
> 
> @@ -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;
> -

is this check only relevant to sm mode or should it be removed for
both legacy/sm? If the latter please add a note in the commit msg.

otherwise,

Reviewed-by: Kevin Tian <kevin.tian@intel.com>

On 2024/3/4 15:53, Tian, Kevin wrote:
>> From: Lu Baolu<baolu.lu@linux.intel.com>
>> Sent: Thursday, February 29, 2024 5:48 PM
>>
>> @@ -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;
>> -
> is this check only relevant to sm mode or should it be removed for
> both legacy/sm? If the latter please add a note in the commit msg.

This kind of check makes no sense. I didn't take it to sm mode. So only
need to remove it in the legacy path.

Anyway, let me update the commit message to reflect this change.

Best regards,
baolu