Valve hired mesa developer Samuel pitoiset to support rAdV and prepare for the upcoming AMD gfx11 GPU (rdna3) RAdV is an open source radeon Vulkan driver integrated into mesa 22.2 and Linux 5.19. RAdV is not the official driver of AMD, but it is more widely used than the official amdvlk driver.
Since valve does not officially support open source rAdV drivers, third parties must provide integration and help support in the open source part. In rAdV gfx11 'amd rDNA 3' driver support, pitoiset's participation this time focuses on "learning design changes" about the new generation of graphics cards.
The improvement will be based on AMD's support for the radeonsi gallium3d driver and the company's new shader compiler amdgpu llvm. Amd continues to support the Linux kernel in the amdgpu direct rendering manager driver. It is unclear, but it is speculated that AMD is providing details or information to valve to help pitoiset obtain the ability of rDNA 3 GPU technology before release.
In addition to the current work of supporting rDNA 3 in the open source model, you can also see the back-end amd compiler developed by valve in the kernel information.