drm/amdgpu: flush the HDP only once for CPU based VM updates

No need to do this after every single update.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 12 insertions, 4 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 5638c16887d8..24879cf3da9b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -992,10 +992,6 @@ static void amdgpu_vm_cpu_set_ptes(struct amdgpu_pte_update_params *params,
                                         i, value, flags);
                 addr += incr;
         }
-
-        /* Flush HDP */
-        mb();
-        amdgpu_gart_flush_gpu_tlb(params->adev, 0);
 }
 
 static int amdgpu_vm_wait_pd(struct amdgpu_device *adev, struct amdgpu_vm *vm,
@@ -1238,6 +1234,12 @@ int amdgpu_vm_update_directories(struct amdgpu_device *adev,
         if (r)
                 amdgpu_vm_invalidate_level(&vm->root);
 
+        if (vm->use_cpu_for_update) {
+                /* Flush HDP */
+                mb();
+                amdgpu_gart_flush_gpu_tlb(adev, 0);
+        }
+
         return r;
 }
 
@@ -1745,6 +1747,12 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
                 list_add(&bo_va->vm_status, &vm->cleared);
         spin_unlock(&vm->status_lock);
 
+        if (vm->use_cpu_for_update) {
+                /* Flush HDP */
+                mb();
+                amdgpu_gart_flush_gpu_tlb(adev, 0);
+        }
+
         return 0;
 }