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authorDavid Woodhouse <David.Woodhouse@intel.com>2015-10-13 16:11:13 +0300
committerDavid Woodhouse <David.Woodhouse@intel.com>2015-10-15 15:22:35 +0300
commit907fea3491d52063bb37b1f1ce0cf8a4ae70944c (patch)
tree87bd60e81510676710fd1cedeb678c42e8d9704b /drivers/iommu/intel-svm.c
parent2f26e0a9c9860db290d63e9d85c2c8c09813677f (diff)
downloadlinux-907fea3491d52063bb37b1f1ce0cf8a4ae70944c.tar.xz
iommu/vt-d: Implement deferred invalidate for SVM
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/iommu/intel-svm.c')
-rw-r--r--drivers/iommu/intel-svm.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 82d53e15b865..a64720b5bd34 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -26,6 +26,10 @@ struct pasid_entry {
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 @@ static void intel_flush_svm_range(struct intel_svm *svm, unsigned long address,
{
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);