Vulkan lavapipe software rendering is working on Haiku

Development
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I started implementing my own libdrm.so without major/minor and KMS stuff. I implemented some stub graphics card device and drmIoctl() so Radeon Vulkan driver detect stub graphics card and attempt to initalize. Currently it fails because of unknown GPU family ID.

libdrm_amdgpu.so is used without modifications.

> /Haiku/data/packages/Vulkan/build.x86_64/bin/gears
drmGetDevices2()
drmIoctl(3, 0xc0406400)
DRM_IOCTL_VERSION
drmIoctl(3, 0xc0406400)
DRM_IOCTL_VERSION
drmIoctl(3, 0xc0406400)
DRM_IOCTL_VERSION
drmIoctl(3, 0xc0406400)
DRM_IOCTL_VERSION
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_ACCEL_WORKING
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_DEV_INFO
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_READ_MMR_REG
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_READ_MMR_REG
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_READ_MMR_REG
/Haiku/data/packages/libdrm/drm/builddir.x86_64/install/share/libdrm/amdgpu.ids version: 1.0.0
drmGetDevice2()
drmFreeDevice()
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_DEV_INFO
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_UVD
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_UVD
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_UVD
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_UVD
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_VCN
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_VCN
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_VCN
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_VCN
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_UVD
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_VCN
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_FW_VCN
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_VRAM_GTT
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_VRAM_USAGE
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_VRAM_GTT
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_VIS_VRAM_USAGE
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_VRAM_GTT
drmIoctl(4, 0x80206445)
DRM_AMDGPU_INFO
  AMDGPU_INFO_GTT_USAGE
amdgpu: unknown (family_id, chip_external_rev): (0, 0)
drmFreeDevices()
drmFreeDevice()
Fatal : VkResult is "ERROR_INITIALIZATION_FAILED" in ../base/vulkanexamplebase.cpp at line 926
gears: ../base/vulkanexamplebase.cpp:926:bool VulkanExampleBase::initVulkan(): res == VK_SUCCESS
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