[PATCH 1/1] drm/amdgpu: Update PDEs flush TLB if PDEs is moved

[Philip Yang]

Update PDEs, PTEs don't need flush TLB after updating mapping, this will
remove the unnecessary TLB flush to reduce map to GPUs time.

Suggested-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 9596c22fded6..8cdfd09fd70d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -755,6 +755,10 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev,
 		goto error;
 
 	list_for_each_entry(entry, &vm->relocated, vm_status) {
+		/* vm_flush_needed after updating moved PDEs */
+		if (entry->moved)
+			atomic64_inc(&vm->tlb_seq);
+
 		r = amdgpu_vm_pde_update(&params, entry);
 		if (r)
 			goto error;
@@ -764,9 +768,6 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev,
 	if (r)
 		goto error;
 
-	/* vm_flush_needed after updating PDEs */
-	atomic64_inc(&vm->tlb_seq);
-
 	while (!list_empty(&vm->relocated)) {
 		entry = list_first_entry(&vm->relocated,
 					 struct amdgpu_vm_bo_base,
-- 
2.35.1