Forum Discussion

LennartVH's avatar
LennartVH
Icon for New Contributor rankNew Contributor
3 years ago

CRAM SEU detection and mitigation support with OpenCL/oneAPI

Hi there, I'm doing a large and long-running FPGA supercomputing project, with an average of 20 FPGAs running in parallel over the course of 5 months. Our project is very sensitive to cosmic ...
LennartVH's avatar
LennartVH
Icon for New Contributor rankNew Contributor
3 years ago

So searching through the Intel OpenCL headers I came across this nice function which seems to suggest ECC CRAM SEU detection is built into the BSP. If that is the case then that would be amazing.

clSetDeviceExceptionCallbackIntelFPGA(
    cl_uint                   num_devices,
    const cl_device_id *      devices,
    CL_EXCEPTION_TYPE_INTEL   listen_mask,
    void (CL_CALLBACK *       pfn_exception_notify)(
        CL_EXCEPTION_TYPE_INTEL   exception_type,
        const void *              private_info,
        size_t                    cb,
        void *                    user_data),
    void *                    user_data);

I cannot find anything in the docs about this function, so perhaps you can help me.
A. Does this detect M20K eccs AND/OR CRAM ecc? I believe M20Ks in the OpenCL kernel are not covered as they are configured in Quad-Port mode. Mostly I'm interested in CRAM ecc detection.
B. Is the listen_mask inclusive or exclusive? Kind of important to know, and impossible to test. What should I pass to make sure I capture any and all detected CRAM ECC faults?

Kind regards,
Lennart