[PATCH 5/9] iommu/amd: Implement .flush_np_cache

[Tom Murphy <tmurphy@arista.com>]

Implement flush_np_cache for the AMD iommu driver. This allows the amd
iommu non present cache to be flushed if amd_iommu_np_cache is set.

Signed-off-by: Tom Murphy <tmurphy@arista.com>
---
 drivers/iommu/amd_iommu.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b319e51c379b..2d4ee10626b4 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1319,6 +1319,18 @@ static void domain_flush_devices(struct protection_domain *domain)
 		device_flush_dte(dev_data);
 }
 
+static void amd_iommu_flush_np_cache(struct iommu_domain *domain,
+		unsigned long iova, size_t size)
+{
+	struct protection_domain *dom = to_pdomain(domain);
+
+	if (unlikely(amd_iommu_np_cache)) {
+		domain_flush_pages(dom, iova, size);
+		domain_flush_complete(dom);
+	}
+}
+
+
 /****************************************************************************
  *
  * The functions below are used the create the page table mappings for
@@ -3263,6 +3275,7 @@ const struct iommu_ops amd_iommu_ops = {
 	.flush_iotlb_all = amd_iommu_flush_iotlb_all,
 	.iotlb_range_add = amd_iommu_iotlb_range_add,
 	.iotlb_sync = amd_iommu_flush_iotlb_all,
+	.flush_np_cache = amd_iommu_flush_np_cache,
 };
 
 /*****************************************************************************
-- 
2.17.1