drm/amdgpu: fix clearing mappings for BOs that are always valid in VM

Per VM BOs must be marked as moved or otherwise their ranges are not
updated on use which might be necessary when the replace operation
splits mappings.

This fixes random GPU hangs when replacing sparse mappings from the
userspace, while OP_MAP/OP_UNMAP works fine because always valid BOs
are correctly handled there.

Cc: stable@vger.kernel.org
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.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

@@ -1771,18 +1771,30 @@ int amdgpu_vm_bo_clear_mappings(struct amdgpu_device *adev,
 
 	/* Insert partial mapping before the range */
 	if (!list_empty(&before->list)) {
+		struct amdgpu_bo *bo = before->bo_va->base.bo;
+
 		amdgpu_vm_it_insert(before, &vm->va);
 		if (before->flags & AMDGPU_PTE_PRT)
 			amdgpu_vm_prt_get(adev);
+
+		if (bo && bo->tbo.base.resv == vm->root.bo->tbo.base.resv &&
+		    !before->bo_va->base.moved)
+			amdgpu_vm_bo_moved(&before->bo_va->base);
 	} else {
 		kfree(before);
 	}
 
 	/* Insert partial mapping after the range */
 	if (!list_empty(&after->list)) {
+		struct amdgpu_bo *bo = after->bo_va->base.bo;
+
 		amdgpu_vm_it_insert(after, &vm->va);
 		if (after->flags & AMDGPU_PTE_PRT)
 			amdgpu_vm_prt_get(adev);
+
+		if (bo && bo->tbo.base.resv == vm->root.bo->tbo.base.resv &&
+		    !after->bo_va->base.moved)
+			amdgpu_vm_bo_moved(&after->bo_va->base);
 	} else {
 		kfree(after);
 	}