[Nouveau] How to enable OpenCL device in Clover ?

[Nouveau] How to enable OpenCL device in Clover ?

[Timothy Madden]

Hello,

I can see from the mesamatrix page at:

	https://mesamatrix.net/

that NVC0 should support OpenCL 1.2, without the optional image formats 
and device partitioning.

But I have never seen and OpenCL device in Clover for my NVIDIA cards, 
am I missing something ?

I have the following chips:
	- Fermi GF117 (GeForce 710M)
	- Kepler GK208B (GeForce GT 710)
	- Turing TU102 (RTX 2080 Ti)
	- Ampere GA102 (RTX 3090)

(of these, the GF117 chip actually falls in the NVC0 family according to 
the web page for CodeNames: https://nouveau.freedesktop.org/CodeNames.html)

For my latest NVIDIA card (3090) I compiled mesa from git, with the 
OpenCL frontend and spirV option set tot true, and I still get no OpenCL 
device from Clover.

Do I need some specific hardware, and only that is supposed to work ? Do 
I need some option I do not know about ?

--
Thank you,
Timothy Madden

Re: [Nouveau] How to enable OpenCL device in Clover ?

[Andrew Randrianasulu]

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I think you can use
NOUVEAU_ENABLE_CL=1 clpeak for example

it skips memory-hungry bandwidth test but then runs partially:

Platform: Clover
  Device: NV106
    Driver version  : 23.3.0-devel (Linux x86)
    Compute units   : 1
    Clock frequency : 512 MHz
SPIR-V WARNING:
    In file ../src/compiler/spirv/spirv_to_nir.c:4681
    Unsupported SPIR-V capability: SpvCapabilityLinkage (5)
    28 bytes into the SPIR-V binary

    Global memory bandwidth (GBPS)
      float   : nve4_launch_grid:905 - Failed to launch grid !

[..]

Single-precision compute (GFLOPS)
      float   : 80.74
      float2  : 41.38
      float4  : 50.49
      float8  : 51.32
      float16 : 53.58

on unreclocked NVIDIA GK208B (2gb ddr3 memory - ha!)

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Re: [Nouveau] How to enable OpenCL device in Clover ?

[Timothy Maden]

On 10/23/23 20:54, Andrew Randrianasulu wrote:
> I think you can use
> NOUVEAU_ENABLE_CL=1 clpeak for example
> 
> it skips memory-hungry bandwidth test but then runs partially:
> 
> Platform: Clover
>    Device: NV106
>      Driver version  : 23.3.0-devel (Linux x86)
>      Compute units   : 1
>      Clock frequency : 512 MHz
> SPIR-V WARNING:
>      In file ../src/compiler/spirv/spirv_to_nir.c:4681
>      Unsupported SPIR-V capability: SpvCapabilityLinkage (5)
>      28 bytes into the SPIR-V binary
> 
>      Global memory bandwidth (GBPS)
>        float   : nve4_launch_grid:905 - Failed to launch grid !
> 
> [..]
> 
> Single-precision compute (GFLOPS)
>        float   : 80.74
>        float2  : 41.38
>        float4  : 50.49
>        float8  : 51.32
>        float16 : 53.58
> 
> on unreclocked NVIDIA GK208B (2gb ddr3 memory - ha!)

Oh, thank you !

Maybe this variable should be documented, like for example the new 
variable I_WANT_A_BROKEN_VULKAN_DRIVER is documented.

I have a GK208B chip, that I replaced with a GA102.

When I try to use the OpenCL device I get the following error on GA102:

     Build Log: <built-in>:1:10: fatal error: 'opencl-c.h' file not found

this happens with both Mesa 23.2.1 and latest Mesa 24.0.0-devel from git.

The missing header in the message is found in clang-libs package on 
Fedora for example, and if I add the needed -I flag to clBuildProgram(), 
the error goes away. So it looks like a missing include directory inside 
Clover ... ?

Unfortunately I can not add the missing -I flag to OpenCL compiler when 
using clpeak or LuxMark ... without recompiling. Is there an environment 
variable or some other way ?

--
Thank you,
Timothy Madden