iommu/vt-d: Drop pasid requirement for prq initialization

PASID support within the IOMMU is not required to enable the Page
Request Queue, only the PRS capability.

Signed-off-by: Klaus Jensen <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Joel Granados <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lu Baolu <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>

Author: birkelund

drivers/iommu/intel/iommu.c

@@ -1329,10 +1329,8 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
 	/* free context mapping */
 	free_context_table(iommu);
 
-	if (pasid_supported(iommu)) {
-		if (ecap_prs(iommu->ecap))
-			intel_iommu_finish_prq(iommu);
-	}
+	if (ecap_prs(iommu->ecap))
+		intel_iommu_finish_prq(iommu);
 }
 
 /*
@@ -2192,7 +2190,7 @@ static int __init init_dmars(void)
 
 		iommu_flush_write_buffer(iommu);
 
-		if (pasid_supported(iommu) && ecap_prs(iommu->ecap)) {
+		if (ecap_prs(iommu->ecap)) {
 			/*
 			 * Call dmar_alloc_hwirq() with dmar_global_lock held,
 			 * could cause possible lock race condition.
@@ -2616,7 +2614,7 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
 	intel_iommu_init_qi(iommu);
 	iommu_flush_write_buffer(iommu);
 
-	if (pasid_supported(iommu) && ecap_prs(iommu->ecap)) {
+	if (ecap_prs(iommu->ecap)) {
 		ret = intel_iommu_enable_prq(iommu);
 		if (ret)
 			goto disable_iommu;