iommu/vt-d: Implement deferred invalidate for SVM
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 82d53e1..a64720b 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -26,6 +26,10 @@
u64 val;
};
+struct pasid_state_entry {
+ u64 val;
+};
+
int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
{
struct page *pages;
@@ -127,6 +131,11 @@
{
struct intel_svm_dev *sdev;
+ /* Try deferred invalidate if available */
+ if (svm->iommu->pasid_state_table &&
+ !cmpxchg64(&svm->iommu->pasid_state_table[svm->pasid].val, 0, 1ULL << 63))
+ return;
+
rcu_read_lock();
list_for_each_entry_rcu(sdev, &svm->devs, list)
intel_flush_svm_range_dev(svm, sdev, address, pages, ih);