[PATCH 02/11] drm/amdgpu: Reserve fences for VM update

[Felix Kuehling]

In amdgpu_dma_buf_move_notify reserve fences for the page table updates
in amdgpu_vm_clear_freed and amdgpu_vm_handle_moved. This fixes a BUG_ON
in dma_resv_add_fence when using SDMA for page table updates.

Signed-off-by: Felix Kuehling <felix.kuehl...@amd.com>
Reviewed-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
index 76b618735dc0..b5e28fa3f414 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -404,7 +404,10 @@ amdgpu_dma_buf_move_notify(struct dma_buf_attachment 
*attach)
                                continue;
                }
 
-               r = amdgpu_vm_clear_freed(adev, vm, NULL);
+               /* Reserve fences for two SDMA page table updates */
+               r = dma_resv_reserve_fences(resv, 2);
+               if (!r)
+                       r = amdgpu_vm_clear_freed(adev, vm, NULL);
                if (!r)
                        r = amdgpu_vm_handle_moved(adev, vm);
 
-- 
2.34.1