drm/amdgpu: vm flush needed after updating PDEs

If page table PDEs is evicted and restored, after updating PDEs, need
increase vm->tlb_seq, then amdgpu_vm_flush will flush TLB before command
submission.
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

@@ -764,6 +764,9 @@ 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,