[PATCH 1/2] drm/amdgpu: add some lockdep checks to the VM code

[Christian König]

Whenever a bo_va structure is added or removed the VM and eventually
added BO should be locked.

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b23cb463b106..7910046fe11a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2260,6 +2260,8 @@ struct amdgpu_bo_va *amdgpu_vm_bo_add(struct 
amdgpu_device *adev,
 {
        struct amdgpu_bo_va *bo_va;
 
+       dma_resv_assert_held(vm->root.bo->tbo.base.resv);
+
        bo_va = kzalloc(sizeof(struct amdgpu_bo_va), GFP_KERNEL);
        if (bo_va == NULL) {
                return NULL;
@@ -2273,6 +2275,7 @@ struct amdgpu_bo_va *amdgpu_vm_bo_add(struct 
amdgpu_device *adev,
        if (!bo)
                return bo_va;
 
+       dma_resv_assert_held(bo->tbo.base.resv);
        if (amdgpu_dmabuf_is_xgmi_accessible(adev, bo)) {
                bo_va->is_xgmi = true;
                /* Power up XGMI if it can be potentially used */
@@ -2667,7 +2670,10 @@ void amdgpu_vm_bo_rmv(struct amdgpu_device *adev,
        struct amdgpu_vm *vm = bo_va->base.vm;
        struct amdgpu_vm_bo_base **base;
 
+       dma_resv_assert_held(vm->root.bo->tbo.base.resv);
+
        if (bo) {
+               dma_resv_assert_held(bo->tbo.base.resv);
                if (bo->tbo.base.resv == vm->root.bo->tbo.base.resv)
                        vm->bulk_moveable = false;
 
-- 
2.25.1