09:42 <tomeu> lynxeye: do you think we need a ETNAVIV_PARAM_GPU_SHADER_CORE_COUNT ?

09:45 <lynxeye> tomeu: Do you really mean shader cores or rather NN cores?

09:45 <tomeu> sorry, meant for NN cores

09:45 <tomeu> not sure what userspace would do with that info

09:47 <lynxeye> Yea that's exactly one of the things why I want the NPU support to be marked as experimental. I _feel_ like we may need that info in userspace, but I don't know enough about the NN accelerator yet to be sure.

09:49 <lynxeye> The downstream kernel has even more such properties. From the HWDB there it looks like the NN cores could have different abilities, like the number of cores that support bfloat16. I guess that would also be required info userspace that actually makes use of the NN accelerator.

09:51 <lynxeye> So while I think we need some way to communicate the number of NN cores to userspace I also feel like it may just be a subset of the required info. So I would rather see us add the minimal support for the kernel driver to properly identify NPU cores and then add UAPI once we have actual userspace for the NN accelerator.

09:56 <tomeu> yeah, though downstream drivers tend to have UABIs a few times more complex than mainline

09:56 <tomeu> to me it is not clear even if any silicon was shipped that would make use of some of the properties

09:57 <tomeu> ok, I'm all for adding UAPI only after we have a good use for it

09:57 <tomeu> so won't be exposing it for now

09:58 <lynxeye> I certainly won't argue to replicate the blob UAPI ;) I guess we have a much better picture on what is actually needed once we have some kind of userspace and a bit more RE done.

10:13 <tomeu> yeah, I'm looking now at what would take to run TFLite on it

10:14 <tomeu> that should give us a better idea of what is actually needed

10:44 <tomeu> ok, have gone with:

10:44 <tomeu> [ 733.663033] etnaviv-gpu ff100000.npu: model: GC8000, revision: 7120

10:44 <tomeu> [ 733.669266] etnaviv-gpu ff100000.npu: etnaviv has been instantiated on a NPU, for which the UAPI is still experimental

10:44 <tomeu> [ 733.680375] [drm] Initialized etnaviv 1.3.0 20151214 for etnaviv on minor 2

10:59 <mwalle> so is that a GPU without an actual graphics output?

11:08 <lynxeye> mwalle: Nope, it misses the 2D/3D pipeline. It just has the same shader clusters, so you can do the OpenCL part on it. Plus a big matrix accelerator for the NN stuff.

11:08 <lynxeye> tomeu: looks good

13:37 <mwalle> lynxeye: ah, thanks