iommu/vt-d: Omit devTLB invalidation requests when TES=0

[platform/kernel/linux-starfive.git] / drivers / iommu / intel / dmar.c

diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index a3414af..23cb80d 100644 (file)
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -1522,6 +1522,15 @@ void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
 {
        struct qi_desc desc;
 
+       /*
+        * VT-d spec, section 4.3:
+        *
+        * Software is recommended to not submit any Device-TLB invalidation
+        * requests while address remapping hardware is disabled.
+        */
+       if (!(iommu->gcmd & DMA_GCMD_TE))
+               return;
+
        if (mask) {
                addr |= (1ULL << (VTD_PAGE_SHIFT + mask - 1)) - 1;
                desc.qw1 = QI_DEV_IOTLB_ADDR(addr) | QI_DEV_IOTLB_SIZE;
@@ -1587,6 +1596,15 @@ void qi_flush_dev_iotlb_pasid(struct intel_iommu *iommu, u16 sid, u16 pfsid,
        unsigned long mask = 1UL << (VTD_PAGE_SHIFT + size_order - 1);
        struct qi_desc desc = {.qw1 = 0, .qw2 = 0, .qw3 = 0};
 
+       /*
+        * VT-d spec, section 4.3:
+        *
+        * Software is recommended to not submit any Device-TLB invalidation
+        * requests while address remapping hardware is disabled.
+        */
+       if (!(iommu->gcmd & DMA_GCMD_TE))
+               return;
+
        desc.qw0 = QI_DEV_EIOTLB_PASID(pasid) | QI_DEV_EIOTLB_SID(sid) |
                QI_DEV_EIOTLB_QDEP(qdep) | QI_DEIOTLB_TYPE |
                QI_DEV_IOTLB_PFSID(pfsid);