missing /dev/dma_heap/*

[99degree]

Is your feature request related to a problem? Please describe. running libcamera/cam app fail and get below log, i believe that dmabuf is not only about dma/cma but heap/shared_mem management. Virtual environment dont have dma/cma but it should have heap management api.

[4:02:43.357334657] [42643] INFO Camera camera_manager.cpp:326 libcamera v0.5.1+26-a17c85e6-dirty (2025-06-18T17:30:44GMT) [4:02:43.362243459] [42644] ERROR DmaBufAllocator dma_buf_allocator.cpp:119 Could not open any dma-buf provider Available cameras:

Describe the solution you'd like enable kernel with dmabuf heap

Describe alternatives you've considered Nil.

Additional context Nil.

[github-actions[bot]]

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[99degree]

/feature

[github-actions[bot]]

Diagnostic information

Found '/feature', adding tag 'feature'

[kbingham]

Specifically - https://github.com/microsoft/WSL2-Linux-Kernel/blob/427645e3db3a8896714f22a3d3fe0c3f7b317ad4/arch/x86/configs/config-wsl#L6055 could benefit from being changed to:

-# CONFIG_UDMABUF is not set
+CONFIG_UDMABUF=y

This is indeed a requirement for running the virtual pipeline handler with libcamera.