iommu/vt-d: Get domain ID before clear pasid entry

After tearing down a pasid entry, the domain id is used to
invalidate the translation caches. Retrieve the domain id
from the pasid entry value before clearing the pasid entry.
Otherwise, we will always use domain id 0.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Fixes: 6f7db75e1c469 ("iommu/vt-d: Add second level page table interface")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index 53fe5248d8f1c14424e7718c74580d84075fcfd0..03b12d2ee2132fe624eeed719dc486d89279f2e4 100644 (file)
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -466,8 +466,8 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
        if (WARN_ON(!pte))
                return;
 
-       intel_pasid_clear_entry(dev, pasid);
        did = pasid_get_domain_id(pte);
+       intel_pasid_clear_entry(dev, pasid);
 
        if (!ecap_coherent(iommu->ecap))
                clflush_cache_range(pte, sizeof(*pte));