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Most OpenCL API calls return a status/error value, either directly or via an out-parameter (example: clCreateBuffer()). While that is not as informative as a long-form string description, it can tell us things like CL_OUT_OF_HOST_MEMORY, CL_MAP_FAILURE and such. However, the clSVMAlloc() API function returns a void *, and has no status out-parameter - while having multiple possible reasons for failure:

clSVMAlloc will fail if:

  • context is not a valid context, or no devices in context support SVM.

  • flags does not contain CL_MEM_SVM_FINE_GRAIN_BUFFER but does contain CL_MEM_SVM_ATOMICS.

  • Values specified in flags do not follow rules described for supported values in the SVM Memory Flags table.

  • CL_MEM_SVM_FINE_GRAIN_BUFFER or CL_MEM_SVM_ATOMICS is specified in flags and these are not supported by at least one device in context.

  • The values specified in flags are not valid, i.e. do not match those defined in the SVM Memory Flags table.

  • size is 0 or > CL_DEVICE_MAX_MEM_ALLOC_SIZE value for any device in context.

  • alignment is not a power of two or the OpenCL implementation cannot support the specified alignment for at least one device in context.

  • There was a failure to allocate resources.

so, is there a way I can determine which kind of failure occurred?

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