How to determine the memory type of raw ptrs?

Accelerated Computing CUDA CUDA Programming and Performance
1

I need to determine the memory type of raw pointers,
which have been allocated on device (cudaMalloc) or host (malloc, cudaHostMalloc).

The following snippet should have solved this according to the reference manual:

T* h_t = ... // host mem allocation, T e.g. float
cudaPointerAttributes attr;
cudaPointerGetAttributes(&attr, h_t);
// get memory type (host/dev) from attr struct
// ...

Unfortunately I get an “invalid argument” error in line 2.
Any proposals on how to solve/achieve this?

2

The above code snippet and approach are fine.
The problem was that UVA was disabled.