Is it possible to call extension functions?

[wozeparrot]

Basically support for clGetExtensionFunctionAddressForPlatform, our usecase in tinygrad is for the cl_amd_copy_buffer_p2p which has an extension function clEnqueueCopyBufferP2PAMD

Currently it is possible by maintaining a fork of pyopencl, but it's better if we can just use upstream. I'm not sure what the policy is on upstreaming a change like this because it is very extension/platform specific.

[inducer]

Sure, I'd be happy to look at a PR along those lines. Wrapping CL extensions is definitely in scope. There are a few precedents for that in the code base even today. The one caveat is that the corresponding header has to be available at build time (or part of the shipped extension header), and the wrapper must be sufficiently #ifdef'd to ensure that the build succeeds irrespective of whether the extension header is available.