iommu/amd: Remove clear_flush_young notifier

AMD IOMMU driver is using the clear_flush_young() to do cache flushing
but that's actually already covered by invalidate_range().  Remove the
extra notifier and the chunks.
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd_iommu_v2.c

@@ -370,29 +370,6 @@ static struct pasid_state *mn_to_state(struct mmu_notifier *mn)
 	return container_of(mn, struct pasid_state, mn);
 }
 
-static void __mn_flush_page(struct mmu_notifier *mn,
-			    unsigned long address)
-{
-	struct pasid_state *pasid_state;
-	struct device_state *dev_state;
-
-	pasid_state = mn_to_state(mn);
-	dev_state   = pasid_state->device_state;
-
-	amd_iommu_flush_page(dev_state->domain, pasid_state->pasid, address);
-}
-
-static int mn_clear_flush_young(struct mmu_notifier *mn,
-				struct mm_struct *mm,
-				unsigned long start,
-				unsigned long end)
-{
-	for (; start < end; start += PAGE_SIZE)
-		__mn_flush_page(mn, start);
-
-	return 0;
-}
-
 static void mn_invalidate_range(struct mmu_notifier *mn,
 				struct mm_struct *mm,
 				unsigned long start, unsigned long end)
@@ -430,7 +407,6 @@ static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
 
 static const struct mmu_notifier_ops iommu_mn = {
 	.release		= mn_release,
-	.clear_flush_young      = mn_clear_flush_young,
 	.invalidate_range       = mn_invalidate_range,
 };