drm/radeon: add userptr flag to register MMU notifier v3
Whenever userspace mapping related to our userptr change we wait for it to become idle and unmap it from GTT. v2: rebased, fix mutex unlock in error path v3: improve commit message Signed-off-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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Alex Deucher

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commit
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@@ -75,6 +75,7 @@ static void radeon_ttm_bo_destroy(struct ttm_buffer_object *tbo)
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bo = container_of(tbo, struct radeon_bo, tbo);
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radeon_update_memory_usage(bo, bo->tbo.mem.mem_type, -1);
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radeon_mn_unregister(bo);
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mutex_lock(&bo->rdev->gem.mutex);
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list_del_init(&bo->list);
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