diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel/pasid.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c index c81f0f17c6ba..fa0154cce537 100644 --- a/drivers/iommu/intel/pasid.c +++ b/drivers/iommu/intel/pasid.c @@ -486,7 +486,16 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu, qdep = info->ats_qdep; pfsid = info->pfsid; - qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT); + /* + * When PASID 0 is used, it indicates RID2PASID(DMA request w/o PASID), + * devTLB flush w/o PASID should be used. For non-zero PASID under + * SVA usage, device could do DMA with multiple PASIDs. It is more + * efficient to flush devTLB specific to the PASID. + */ + if (pasid == PASID_RID2PASID) + qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT); + else + qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0, 64 - VTD_PAGE_SHIFT); } void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev, |