clinfo (opencl) reports no devices with Nouveau driver

[Timur Tabi]

I have an Nvidia TU10x GPU installed and I'm using the Nouveau device driver. I cannot get OpenCL to work because it does not see any devices. I'm using Ubuntu 22.04.

I have installed the following packages:
linux-modules-extra-5.15.0-52-generic opencl-c-headers ocl-icd-opencl-dev clinfo ocl-icd-libopencl1 ocl-icd-dev mesa-opencl-icd

clinfo reports that a platform exists, but no devices are found:

  Platform Name Clover
  Platform Vendor Mesa
  Platform Version OpenCL 1.1 Mesa 22.0.5
  Platform Profile FULL_PROFILE
  Platform Extensions cl_khr_icd
  Platform Extensions function suffix MESA

  Platform Name Clover
Number of devices 0

NULL platform behavior
  clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) Clover
  clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) No devices found in platform [Clover?]
  clCreateContext(NULL, ...) [default] No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR) No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM) No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL) No devices found in platform

ICD loader properties
  ICD loader Name OpenCL ICD Loader
  ICD loader Vendor OCL Icd free software
  ICD loader Version 2.2.14
  ICD loader Profile OpenCL 3.0

[George Kraft (cynerva)]

Hi, can you clarify how this relates to Charmed Kubernetes? Is this issue occurring in an Ubuntu pod on a Kubernetes cluster?

[Timur Tabi (timur-tabi)]

I don't know why the bug report says that. I didn't set it.

[George Kraft (cynerva)]

That's weird. Was this meant to be filed against OpenCL, Ubuntu, or something else? I can try to reassign it to the correct project if you can let me know where you want it.

[Timur Tabi (timur-tabi)]

It was meant to be filed against Ubuntu. According to the Nouveau guys, this should work, but they suspect that Ubuntu is not building Mesa correctly -- something about not specifying "opencl-spirv=true" when building, but I don't know enough about Mesa and OpenCL to know whether that's the case.